JP7522020B2 - Concrete supply distributor - Google Patents

Description

The present invention relates to a concrete supply distributor that includes a base device, a mast device supported in an upright position on the base device, and a boom device mounted on the mast device.

The base device of the concrete supply distributor is equipped with a frame including rectangular upper and lower frames and a vertical frame connecting the upper and lower frames, and a number of outriggers that are pivotally supported by the frame and can rotate between a stored position and an deployed position. A technology for stabilizing support of the base device, and therefore the mast device and boom device, by holding the outriggers in the deployed position is known in the art, as disclosed in Patent Document 1, for example.

Utility Model Publication No. 61-49849

However, in the base 10A (above frame) that forms the main part of the base of the distributor in Patent Document 1, a bracket 10a is provided that protrudes outward from the outside of the vertical frame that connects the upper and lower frames and extends vertically, and the base of the support leg 10B (outrigger) is rotatably supported by this bracket 10a.

Because the pivot shaft is supported on the bracket 10a outside the vertical frame, and the support leg 10B rotates around the pivot shaft, even when the support leg 10B is in the stored position, it protrudes somewhat outside the frame (i.e., the base 10A) including the upper and lower frames and vertical frame, which is inconvenient as it requires a relatively large occupying space.

The present invention was proposed in light of the above, and aims to provide a distributor for supplying concrete that can solve the problems of conventional structures with a simple structure.

In order to achieve the above object, the present invention provides a concrete supply distributor having a base device, a mast device supported in an upright position on the base device, and a boom device mounted on the mast device, the base device comprising a base frame, a plurality of upper frames fixed to the base frame and arranged to surround the base frame, upper bearings each having at least a portion located on the inner side of the intersection of the outer side surfaces of adjacent upper frames along the longitudinal direction in a plan view or on the inner side of the intersection of the extension lines of the outer sides and connected to the adjacent ends of the adjacent upper frames, and upper bearings each having at least a portion located on the inner side of the intersection of the outer side surfaces of adjacent upper frames along the longitudinal direction in a plan view and connected to the adjacent ends of the adjacent upper frames, and upper bearings each having at least a portion located on the inner side of the intersection of the outer side surfaces of adjacent upper frames along the longitudinal direction in a plan view, the ... The first feature of the system is that it comprises a plurality of lower frames arranged at a distance from each other, a lower bearing that is at least partially located on the inner side of the intersection of the outer side surfaces of adjacent lower frames along the longitudinal direction in a plan view or on the inner side of the intersection of the extension lines of the outer sides and is respectively connected to the adjacent ends of the adjacent lower frames, a plurality of outriggers each having a bearing cylinder portion at its base and disposed between the corresponding upper bearing and lower bearing, and a rotating support shaft that is inserted into the upper bearing, the bearing cylinder portion, and the lower bearing that are on the same axis, and the outriggers are rotatable about the rotating support shaft between a stored position along the upper frame and the lower frame and a deployed position that projects outward from the stored position.

In addition to the first feature, the present invention has a second feature in that the upper bearing and the lower bearing each have a cylindrical bearing body and a surrounding frame that surrounds the outer periphery of the bearing body, the surrounding frame has a flat mounting surface that is perpendicular to the longitudinal direction of the upper frame or the lower frame, and the end face of the upper frame or the lower frame abuts against and is fixed to the mounting surface.

In addition to the second feature, the third feature of the present invention is that the contact surface between the mounting surface and the corresponding upper frame or lower frame is located outside a virtual vertical plane that passes through the center line of the upper bearing or lower bearing surrounded by the enclosure frame having the mounting surface and is parallel to the axis of the corresponding upper frame or lower frame.

In addition to any of the first to third features, the fourth feature of the present invention is that each outrigger is set to a maximum vertical width that is smaller than the mutual distance between the opposing faces of the upper frame and the lower frame so that it can enter the space between the corresponding upper frame and lower frame when stored, and a horizontal length such that the tip of the outrigger when stored does not interfere with the base of the adjacent outrigger.

According to the present invention, the base device comprises a plurality of upper frames fixed to the base frame and arranged to surround it; upper bearings, at least a portion of which is located inward of the intersection of the outer side surfaces of adjacent upper frames along the longitudinal direction in a plan view or inward of the intersection of the extension lines of the outer sides, and which are respectively connected to the adjacent ends of the adjacent upper frames; a plurality of lower frames fixed to the base frame and arranged directly below the upper frames corresponding to the plurality of upper frames; lower bearings, at least a portion of which is located inward of the intersection of the outer side surfaces of adjacent lower frames along the longitudinal direction in a plan view or inward of the intersection of the extension lines of the outer sides, and which are respectively connected to the adjacent ends of the adjacent lower frames; a plurality of outriggers each having a bearing tube portion at its base and each of which is arranged between a corresponding upper bearing and lower bearing; and a rotating support shaft inserted into the upper bearing, bearing tube portion, and lower bearing, which are on the same axis. This allows the base of the outrigger to be positioned in the space between the upper bearing, which is connected to the adjacent end of the adjacent upper frame on the inner side of the base frame, and the lower bearing, which is connected to the adjacent end of the adjacent lower frame on the inner side of the base frame, effectively preventing the outrigger from protruding outward from the frame including the base frame and the upper and lower frames during storage, making the base device smaller and reducing the space it occupies. As a result, the base device can be moved effortlessly through small spaces at construction sites (such as through holes that penetrate the floor slab from top to bottom), improving workability.

According to the second feature, the upper bearing and the lower bearing each have a cylindrical bearing body and an enclosure frame surrounding the outer periphery of the bearing body, and the enclosure frame has a flat mounting surface perpendicular to the longitudinal direction of the upper frame or the lower frame, and the end face of the upper frame or the lower frame abuts and is fixed to the mounting surface. As a result, even if the bearing body is cylindrical, the above-mentioned enclosure wall is interposed between the outer periphery of the bearing body and the end faces of the upper and lower frames, making it possible to transmit the load between the bearing body and the upper and lower frames approximately evenly without bias, which contributes to improving durability.

According to the third feature, the contact surface between the mounting surface of the surrounding wall and the corresponding upper or lower frame is positioned outside a virtual vertical plane that passes through the center line of the upper or lower bearing surrounded by the surrounding frame having the mounting surface and is parallel to the axis of the corresponding upper or lower frame. This ensures a wide support span for the upper and lower bearings by the upper and lower frames, thereby increasing the support rigidity for the upper and lower bearings.

According to the fourth feature, each outrigger is set to a maximum vertical width smaller than the mutual distance between the opposing faces of the upper and lower frames so that it can enter the space between the corresponding upper and lower frames when stored, and a horizontal length such that the tip of the outrigger when stored does not interfere with the base of the adjacent outrigger. This makes it possible to fully utilize the space between the upper and lower frames as storage space for the outrigger when stored, while avoiding interference between the base of the outrigger, including the bearing tube portion, and the tip of the adjacent outrigger, and therefore makes it possible to more effectively prevent the outrigger from protruding outside the frame when stored.

FIG. 1A is a vertical cross-sectional view showing an example of an operating state of a distributor according to an embodiment of the present invention, and FIG. 1B is a view taken along the arrow 1B in FIG. FIG. 2 is an enlarged side view of the base device; FIG. 3 is a plan view of the base device (view taken along the arrow 3 in FIG. 2 ); FIG. 4 is an enlarged partially cutaway plan view of the portion indicated by the arrow 4 in FIG. 5A is a cross-sectional view taken along line 5A-5A in FIG. 4, and FIG. 5B is a cross-sectional view taken along line 5B-5B in FIG. 6A is an exploded plan view of the main part of the base body and the outriggers as viewed from the same side as in FIG. 4, FIG. 6B is a cross-sectional view taken along line b-b in FIG. 6A, and FIG. 6C is a cross-sectional view taken along line c-c in FIG. 6A. Overall perspective view of the base device A simplified plan view showing the relationship between the upper and lower connecting pins and the upper and lower pin insertion holes that are in an operating state when the outriggers are stored and deployed. Side view of the main part of the mast device 9A is a cross-sectional view taken along line 10A-10A in FIG. 9, (B) is a cross-sectional view taken along line 10B-10B in FIG. 9, and (C) is a cross-sectional view taken along line 10C-10C in FIG. 9. FIG. 2 is an overall side view of a boom device in which a boom row is in a horizontal position (an enlarged side view of the portion indicated by the arrow 11 in FIG. 1 ). 12A is a cross-sectional view taken along line 12A-12A in FIG. 11, and FIG. 12B is a cross-sectional view taken along line 12B-12B in FIG. Overall perspective view of the boom support base Schematic diagram of the distributor's [assembly process] 15A is an enlarged side view of the portion indicated by the arrow 15A in FIG. 14, and FIG. 15B is a view indicated by the arrow 15B in FIG. Schematic diagram of the distributor's [Refilling Process] 16(A) is an enlarged side view of the portion indicated by the arrow 17A in FIG. 16(F), and FIG. 17(B) is a view indicated by the arrow 17B in FIG. 17(A). 17(A) is an enlarged side view of the portion indicated by the arrow 18A in FIG. 17(B), and FIG. 17(B) is an enlarged side view of the portion indicated by the arrow 18B in FIG. 17(A). A schematic diagram showing variations of the latter stages of the distributor's "refilling process" 20A is a schematic plan view of an embodiment, FIG. 20B is a schematic side view of the embodiment (viewed in the direction of arrow 20B in FIG. 20A ), FIG. 20C is a schematic plan view of another embodiment, and FIG. 20D is a schematic side view of another embodiment (viewed in the direction of arrow 20D in FIG. 20C ). FIG. 1 is a circuit diagram showing an outline of a grease supply system according to an embodiment of the present invention;

Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The concrete supply distributor D is used to receive ready mixed concrete for constructing various parts of a structure (such as floor slabs and walls) at a construction site such as a building from a concrete pump (not shown) placed on the ground at the site, and supply it to various parts of a casting site located at an elevated position. An example of its use is shown in Figure 1.

This distributor D comprises a base device 10 that serves as a foundation, a height-adjustable mast device 20 that is supported in an upright position on the base device 10, and a boom device 30 that is mounted on the mast device 20. Next, examples of each of the devices 10, 20, and 30 will be described in order with reference to Figures 2 to 13.

First, the base device 10 will be described with reference to Figures 2 to 7. It has a base body 10m and an outrigger 16 whose base portion 16b is rotatably supported on the base body 10m via a pivot shaft 17. The outrigger 16 can be rotated between a storage position 16B that fits within the base body 10m and a predetermined deployed position 16A that projects outward from the storage position 16B (i.e., outside the base body 10m). The base body 10m is made up of a rigid frame formed by a number of metal frames.

That is, the base body 10m is provided with a base frame 11 that serves as a central skeleton, and this base frame 11 is integrally provided with a square tube section 11b that is formed in a rectangular cross section and extends vertically, and four vertical walls 11a that extend radially from the tops of the square tube section 11b on the front, back, left and right. As each vertical wall section 11a has a complex three-dimensional shape as is clear from Figures 2 to 7, it is constructed by integrally connecting (for example, by welding, bolting, etc.) multiple wall elements to each other. In addition, a bracket 11ab with a locking hole is fixed (for example, by welding, etc.) to the upper part of each vertical wall section 11a in order to lock the lower end of the suspension wire when the base device 10 is suspended independently by a crane (for example, see Figure 14 (A)).

In particular, the square tube portion 11b in this embodiment has a cross-sectional shape that is approximately the same as that of the mast M of the mast device 20, which will be described later, and multiple connecting blocks 21 are fixed at intervals to the outer periphery of the upper end of this square tube portion 11b. Using these connecting blocks 21 and multiple connecting blocks 21' fixed to the outer periphery of the lower end of the lowest mast M, the lowest mast M and the square tube portion 11b (and therefore the base body 10m) are connected to each other, as will be described later.

The base body 10m also includes the above-mentioned base frame 11, a plurality of upper frames 12 (four in the illustrated example) fixed to the base frame 11 and arranged to surround the base frame 11, an upper bearing 14 connecting adjacent ends of adjacent upper frames 12, a plurality of lower frames 13 fixed to the base frame 11 and arranged at intervals directly below the upper frames 12 corresponding to the plurality of upper frames 12, and a lower bearing 15 connecting adjacent ends of adjacent lower frames 13. The upper bearing 14 and the lower bearing 15 each include a cylindrical bearing body 14b, 15b and a surrounding frame 14k, 15k fixed (for example, welded) to the bearing body 14b, 15b and surrounding the outer periphery. A plurality of support legs 13a that can be grounded are protruded from the lower surface of the lower frame 13.

The upper bearing 14 is connected to the adjacent ends of the adjacent upper frames 12 so that at least a part of the upper bearing 14 is located inside the intersection O of the extension lines of the outer surfaces of the adjacent upper frames 12 along the longitudinal direction in a plan view (i.e., the square tube portion 11b side, in other words, the center side of the base body 10m) by having the structure of connecting the upper bearing 14 to the adjacent ends of the adjacent upper frames 12. On the other hand, the lower bearing 15 is connected to the adjacent ends of the adjacent lower frames 13 so that at least a part of the lower bearing 15 is located inside the intersection O of the extension lines of the outer surfaces of the adjacent lower frames 13 along the longitudinal direction in a plan view (i.e., the square tube portion 11b side, in other words, the center side of the base body 10m).

As a result, the outrigger base 16b arranged between the upper bearing 14 and the lower bearing 15 is arranged in the space between the upper bearing 14, which is connected to the adjacent end of the adjacent upper frame 12 near the inside of the base frame 11 (i.e., near the square tube portion 11b, in other words, near the center of the base body 10m), and the lower bearing 15, which is connected to the adjacent end of the adjacent lower frame 13 near the inside of the base frame 11 (i.e., near the square tube portion 11b, in other words, near the center of the base body 10m). Therefore, the outrigger 16 can be effectively prevented from protruding outward from the base body 10m (i.e., the frame including the base frame 11 and the upper and lower frames 12 and 13) during storage, so that the base device 10 can be made smaller and the occupied space can be reduced. As a result, the base device 10 can be moved through a narrow space at the construction site (for example, a through hole that penetrates a floor slab vertically) without difficulty, improving workability.

The above-mentioned enclosure frames 14k, 15k have plate-shaped enclosure frame bodies 140, 150 that surround the bearing bodies 14b, 15b with an annular gap therebetween, and upper and lower pairs of first and second support plate parts 141, 142; 151, 152 that are fixed (e.g., butt-welded) to the upper and lower ends of the enclosure frame body 140, 150 so as to sandwich the enclosure frame body 140, 150 from above and below. The upper and lower pairs of first and second support plate parts 141, 142; 151, 152 are then fixed (e.g., welded) to the upper bearing 14 or lower bearing 15 that passes through them.

In particular, the enclosing frame main body 140, 150 of the embodiment has flat mounting surfaces 14kf, 15kf on the surface facing the upper frame 12 or the lower frame 13, which are perpendicular to the longitudinal center line of the upper and lower frames 12, 13. The end faces 12e, 13e of the upper frame 12 or the lower frame 13 are fixed to these mounting surfaces 14kf, 15kf (butt welding in the embodiment). As a result, even if the bearing main body 14b, 15b is cylindrical, the enclosing frame 14k, 15k is interposed between the outer circumferential surface of the bearing main body 14b, 15b and the upper and lower frames 12, 13e, so that the load can be transmitted approximately evenly between the bearing main body 14b, 15b and the upper and lower frames 12, 13 without bias, and the load burden on each part is reduced, thereby improving durability.

In this embodiment, one (142) of the pair of first and second support plate portions 141, 142 on the upper side and one (151) of the pair of first and second support plate portions 151, 152 on the lower side are formed integrally with a part of the corresponding vertical wall portion 11a of the base frame 11, but they may be formed separately and then fixed (for example, by welding, bolting, etc.) to the tip of the vertical wall portion 11a later.

In addition, the outer edge of each vertical wall portion 11a of the base frame 11 is formed with a concave curved portion 18 that is recessed in an arc shape on the inward side (i.e., toward the square tube portion 11b) between the corresponding upper bearing 14 and lower bearing 15.

As is clear from FIG. 4, the contact surfaces between the above-mentioned mounting surfaces 14kf, 15kf of the enclosure frame main body 140, 150 and the corresponding upper frame 12 or lower frame 13 are located outside the imaginary vertical plane X that passes through the central axis of the upper bearing 14 or lower bearing 15 surrounded by the enclosure frame 14k, 15k having the mounting surfaces 14kf, 15kf and is parallel to the longitudinal center line of the corresponding upper frame 12 or lower frame 13. This makes it possible to ensure a wide support span for the upper and lower bearings 14, 15 by the upper and lower frames 12, 13, thereby increasing the support rigidity for the upper and lower bearings 14, 15.

Furthermore, each outrigger 16 is set to a maximum vertical width L1 (see FIG. 6(c)) smaller than the mutual distance between the opposing faces of the upper and lower frames 12 and 13 so that it can enter the space between the corresponding upper and lower frames 12 and 13 when stored, and a longitudinal length L2 (see FIG. 6(a)) such that the tip 16a of the outrigger 16 when stored does not interfere with the base 16b of the adjacent outrigger 16. This makes it possible to fully utilize the space between the upper and lower frames 12 and 13 as storage space for the outrigger 16 when stored, while avoiding mutual interference between the base 16b, including the bearing cylinder portion 16ba, of each outrigger 16 and the tip 16a of the adjacent outrigger 16, and therefore makes it possible to more effectively prevent the outrigger 16 from protruding outward from the base body 10m when stored.

The outrigger body 16m, which is the main part of each outrigger 16, is made of a metal frame with a sturdy hollow closed cross-section structure with a flat rectangular cross section, and is formed into a horizontally long rectangle in side view. Each outrigger 16 has a bearing tube 16ba extending vertically integrally with its base 16b, and each bearing tube 16ba is disposed between the corresponding upper bearing 14 and lower bearing 15. When each outrigger 16 is set on the base body 10m, the pivot shaft 17 is inserted into the upper bearing 14, bearing tube 16ba, and lower bearing 15, which are aligned on the same vertical axis, so that they can rotate relatively. As a result, the outrigger 16 can rotate around the pivot shaft 17 between a storage position 16B along the upper frame 12 and lower frame 13 and a deployment position 16A extending outward from the storage position 16B.

Between the pivot shaft 17 and the upper bearing 14 (or the lower bearing 15), a retaining means 19 that prevents the pivot shaft 17 from coming out is interposed and is detachable from the upper bearing 14 (or the lower bearing 15).

As is clear from FIG. 3, in this embodiment, the outrigger 16 can be selectively deployed in one of two positions 16A: a main deployed position 16A0 extending in the extension direction of the vertical wall 11a in a plan view, and first and second secondary deployed positions 16A1, 16A2 extending in the extension directions of the upper and lower frames 12, 13 on one side and the other side, sandwiching the upper and lower bearings 14, 15.

In addition, in this embodiment, the outriggers 16 and the base body 10m are each provided with pin insertion holes 16h0, 16h1-16h3; 10h0, 10h1, 10h2 into which the connecting pins P1, P2 that can fix the outrigger 16 to the base body 10m can be removably inserted when the outrigger 16 is at least in the deployed position 16A (also in this embodiment when it is in the stored position 16B). The inner diameters of the pin insertion holes 16h0, 16h1-16h3; 10h0, 10h1, 10h2 are set to the same diameter, and the outer diameters of the upper and lower connecting pins P1, P2 are set to the same diameter that is slightly smaller than the inner diameters.

In this embodiment, the upper connecting pin P1 is connected to the top of each upper bearing 14 via a wire to improve workability and prevent loss, and the lower connecting pin P2 is connected to the outer surface of the base 16b of each outrigger 16 via a wire to improve workability and prevent loss. It is also possible for the workers to store the connecting pins P1 and P2 in an appropriate location on-site without attaching them to the base body 10m in this manner, and to take them out and use them whenever necessary.

Next, the structure of each pin insertion hole will be specifically described with reference to Figures 4 to 6. The upper and lower walls 161, 162 of the outrigger body 16m, which has a rectangular cross section, are formed slightly wider than the planar shape of the upper and lower intermediate parts of the outrigger body 16m. The upper and lower extension parts 161f, 162f of these upper and lower walls 161, 162, which protrude outward from the upper and lower intermediate walls of the outrigger body 16m, respectively, are provided with three pin insertion holes 16h1 to 16h3 on the outrigger 16 side for fixing the deployed position, spaced apart in the circumferential direction, particularly on the base part 16b side of the outrigger 16. These pin insertion holes 16h1 to 16h3 for fixing the deployed position are distributed and arranged in three places, as is clear from Figure 6(a), corresponding to the three deployed positions 16A of the outrigger 16 (i.e., the main deployed position 16A0 and the first and second secondary deployed positions 16A1, 16A2). Additionally, the upper extension 161f of the tip 16a of the outrigger 16 is provided with a pin insertion hole 16h0 for fixing the storage position.

In addition, at least one of the pin insertion holes 16h0, 16h1 to 16h3 on the outrigger 16 side may be provided by drilling a hole in the main part of the outrigger body 16m, for example, in the wall part that constitutes the closed cross section of the outrigger body 16m, instead of providing it in the upper and lower extensions 161f, 162f.

On the other hand, the base body 10m has a pin insertion hole 16h0 on the tip 16a side of the outrigger 16 and a first pin insertion hole 10h0 on the base body 10m side for fixing the outrigger 16 to the storage position 16B in cooperation with the upper connecting pin P1, and this first pin insertion hole 10h0 is disposed in a fixed bracket 12b in the middle part of the upper frame 12.

The base body 10m, particularly the upper and lower support plate portions 141, 142; 151, 152 of the enclosing frames 14k, 15k that clamp the upper and lower bearings 14, 15 from above and below, respectively, have multiple (two in the illustrated example) second pin insertion holes 10h1, 10h2 on the base body 10m side to cooperate with the upper and lower pin insertion holes 16h1-16h3 on the base portion 16b side of the outrigger 16 to fix the outrigger 16 to the three deployed positions 16A0, 16A1, 16A2, respectively.

As is clear from FIG. 5(A), some of the multiple second pin insertion holes 10h1, 10h2 (particularly the pin insertion hole 10h1 provided in the upper and lower support plate portions 151, 152 of the surrounding frame 15k of the lower bearing 15) can be inserted into the lower connecting pin P2 together with one of the pin insertion holes 16h1-16h3 on the base 16b side of the outrigger 16 (the lower pin insertion hole 16h2 in the illustrated example), thereby fixing the outrigger 16 in the storage position 16B.

Figure 8 clearly explains how the insertion relationship between the upper and lower connecting pins P1 and P2, which are used to fix the outrigger 16 in each operating position (i.e., the stored position 16B and the three deployed positions 16A0, 16A1, and 16A2) in this embodiment, and the pin insertion holes 16h0, 16h1 to 16h3; 10h0, 10h1, and 10h2 changes.

In this Figure 8, the thick black dots indicate the connecting pins P1 and P2 selected to fix the outrigger 16 in the corresponding operating position (16B, 16A0, 16A1, 16A2), and the reference numbers of the pin insertion holes in parentheses indicate the pin insertion holes into which the selected connecting pins P1 and P2 are inserted.

In this manner, in this embodiment, when the outrigger 16 is in the storage position 16B or the deployed position 16A, the connecting pins P1 and P2 are inserted into the pin insertion holes 16h1-16h3, 10h1, and 10h2 of the outrigger 16 and the base body 10m, respectively, so that the outrigger 16 can be securely fixed to the storage position 16B or the deployed position 16A relative to the base body 10m, thereby stabilizing support for the base device 10 and, in turn, support for the distributor D.

Moreover, the outrigger 16 of the embodiment has an outrigger main body 16m and extensions 161f, 162f that are fixed to the outrigger main body 16m and extend outward from the outer surface of the outrigger main body 16m, and the pin insertion holes 16h0, 16h1-16h3 on the outrigger 16 side are provided in the extensions 161f, 162f. This not only allows the pin insertion holes 16h0, 16h1-16h3 to be arranged with a high degree of freedom in the outrigger 16 (particularly the extensions 161f, 162f) without affecting the cross-sectional shape of the outrigger main body 16m, but also prevents stress concentration areas (and thus weak areas) from occurring in the outrigger 16 due to the special provision of the pin insertion holes 16h0, 16h1-16h3, ensuring sufficient strength for the outrigger 16.

In addition, the outrigger 16 in this embodiment has pin insertion holes 16h0, 16h1-16h3 on the outrigger 16 side at its tip 16a and base 16b, respectively, while the base body 10m has a first pin insertion hole 10h0 on the base body 10m side for cooperating with the pin insertion hole 16h0 on the tip 16a side of the outrigger 16 to fix the outrigger 16 in the storage position 16B, and two second pin insertion holes 10h1, 10h2 on the base body 10m side for cooperating with the three pin insertion holes 16h1-16h3 on the base 16b side of the outrigger 16 to fix the outrigger 16 in the deployed position 16A (more specifically, the main deployed position 16A0, and the first and second secondary deployed positions 16A1, 16A2). Then, a part of the second pin insertion holes 10h1, 10h2 (the lower pin insertion hole 10h1) can be inserted into the lower connecting pin P2 together with one of the pin insertion holes 16h1-16h3 (the lower pin insertion hole 16h2) on the base 16b side of the outrigger 16, thereby fixing the outrigger 16 in the storage position 16B. This allows the part 10h1 of the two second pin insertion holes 10h1, 10h2 on the base body 10m side, one 16h2 of the three pin insertion holes 16h1-16h3 on the outrigger base 16b side, and the lower connecting pin P2 to be used not only to fix the outrigger 16 in the deployed position 16A but also to fix it in the storage position 16B, which contributes to simplifying the fixing structure and thus reducing costs.

In the above embodiment, two upper and lower connecting pins P1, P2 are inserted into two pin insertion holes 10h0, 10h1 on the base body 10m at two locations on the tip 16a and base 16b sides of the outrigger 16 to fix the outrigger 16 in the storage position 16B, but only one connecting pin (for example, the upper connecting pin P1) may be used to fix the outrigger 16 in the storage position 16B.

In this case, for example, the upper connecting pin P1, which is inserted into one of the second pin insertion holes 10h1, 10h2 10h1 when the outrigger 16 is deployed, can be inserted into the first pin insertion hole 10h0 when the outrigger 16 is stored to fix the outrigger 16 to the storage position 16B. This makes it possible to use only a single connecting pin P1 to fix the outrigger 16 to the storage position 16B, and therefore simplifies the fixing structure and reduces costs.

Although not shown, the outrigger 16 may be fixed in the storage position 16B and the deployed position 16A with a dedicated connecting pin. In that case, for example, the storage position 16B and the deployed position 16A can be fixed with one dedicated pin each, but the hole provided in the outrigger 16 for fixing the storage position 16B is located at the tip of the outrigger 16, and the hole provided in the outrigger 16 for fixing the deployed position 16A is located at the base of the outrigger 16.

Next, an example of a mast device 20 will be described with reference to Figures 9 and 10.

The mast assembly 20 is divided into multiple masts M that are supported upright on the base assembly 10 and connected to each other in a vertical row, and the overall length (and therefore the overall height) of the mast assembly 20 can be increased (higher) by increasing the number of connections between the masts M. The boom assembly 30 is mounted on the top of the mast assembly 20 (i.e., on the top of the topmost mast M).

These masts M are basically of the same structure, and have a sturdy closed cross-sectional structure with a rectangular cross section. A ladder 23 is fixed to the outer periphery of each mast M so that workers can ascend and descend along the mast device 20, and a work platform 24 is fixed to the top of the highest mast M so that workers can safely perform various tasks there. These fixing operations are performed in advance, for example, by a fixing means (e.g., bolting, pinning, riveting, etc.) not shown, before the mast device 20 is installed on the base device 10. The various operations on the work platform 24 include, for example, the operation of connecting the mast device 20 and the boom device 30 in the [assembly process] of the distributor D described below, the operation of connecting various pipes, and also maintenance operations such as inspection and maintenance of each part of the boom support base BS and refueling.

Furthermore, a connecting pipe 28 is fixed to the outer periphery of each mast M, which can be connected to a concrete pumping pipe extending from a concrete pump (not shown) and extends in a vertical arrangement along the mast M, and adjacent connecting pipes 28 can be connected liquid-tightly to each other with an appropriate joint. In this embodiment, the length of the connecting pipe 28 is set to 1/2 the length of one mast M, and for example, two 2 m connecting pipes 28 are connected in series for a mast M with a total length of 4 m.

A number of connecting blocks 21, 21' are fixed (e.g., welded) to the outer circumference of the upper and lower ends of each mast M, arranged at the same circumferential position at both ends and spaced apart from each other in the circumferential direction. The connecting blocks 21, 21' fixed to the outer circumferences of the adjacent ends of a pair of adjacent masts M abut against each other with the masts M vertically arranged. At least one convex portion 22t is provided on one of the abutment surfaces 22, 22' (i.e., the abutment surface facing upward), and at least one concave portion 22d is provided on the other abutment surface 22, 22' (i.e., the abutment surface facing downward). These convex portions 22t and concave portions 22d engage with each other so as to correctly position the pair of adjacent masts M relative to each other and to suppress circumferential and radial positional deviations between the pair of masts M in the directions along the abutment surfaces 22, 22'.

The pair of abutting connecting blocks 21, 21' are integrally connected to each other by a number of bolts 25 that pass through both connecting blocks 21, 21', and this connection maintains the mutual abutment of the connecting blocks 21, 21', and therefore the mutual engagement of the convex portions 22t and concave portions 22d. In this case, the tightening effect of the abutting surfaces by the bolts 25 and the interlocking effect of the concave-convex engaging portions (i.e., the cooperation of the connecting blocks 21, 21' and the bolts 25) work together to reliably prevent the pair of adjacent masts M from shifting position relative to each other, making it possible to tightly and firmly connect the two masts M.

As shown in Figs. 10(A) and 10(B), the bolts 25 of the embodiment include a first bolt 25 that penetrates the tip surface of the convex portion 22t and the bottom surface of the concave portion 22d that abuts against the tip surface, a second bolt 25 that penetrates the abutment surfaces 22, 22' of the connecting blocks 21, 21' on one side of the convex portion 22t, and a third bolt 25 that penetrates the abutment surfaces 22, 22' of the connecting blocks 21, 21' on the other side of the convex portion 22t. As a result, the tightening effect of the abutment surfaces by the first to third bolts is more strongly exerted at the engagement parts between the convex portions and the concave portions and their surrounding areas, and the meshing effect of the concave-convex engagement parts is strengthened, making it possible to firmly connect the two masts while more reliably preventing the positional deviation of the pair of adjacent masts.

In addition, instead of using the first to third bolts 25 described above, it is possible to connect the two masts M, M using only the first bolt 25 that penetrates the convex portion 22t and the concave portion 22d. It is also possible to connect the two masts M, M using the second and third bolts 25 that penetrate both sides of the convex portion 22t and the concave portion 22d.

As is clear from Figures (B) and (C), the connecting blocks 21, 21' in this embodiment are positioned so that the abutment surfaces 22, 22' each protrude beyond the end face of the mast M to which they are fixed on the outer periphery of the end. This leaves a small amount of clearance 29 between the opposing end faces of adjacent masts M. This allows the connecting blocks 21, 21' to abut against each other accurately without being affected by machining errors in the end faces of the masts M, making it possible to accurately connect adjacent masts M while reducing the machining costs of the masts M.

The clearance 29 may be omitted and the opposing end faces of adjacent masts M may be brought into direct contact with each other.

Thus, the concave-convex engagement of the contact surfaces of the connecting blocks 21, 21' described above makes it easy to position a pair of adjacent masts M relative to each other, and the concave-convex engagement reliably prevents the pair of masts M from shifting relative to each other in the direction along the contact surfaces, so the work of connecting the masts M to each other can be done quickly and accurately, greatly improving work efficiency.

In addition, the back surface of each of the connecting blocks 21, 21', i.e., the surface 26 facing the outer periphery of the mast M, is integrally provided with a protrusion 21t that fits into a support hole 27 provided at the end of the mast M where the connecting blocks 21, 21' contact. Then, by fitting this protrusion 21t into the support hole 27, the installation site of each connecting block 21, 21' at the end of the mast M can be easily and accurately positioned. Moreover, the fitting portion between the protrusion 21t and the support hole 27 is welded, and the outer periphery of the facing surface 26 of the connecting blocks 21, 21' is welded over a wide area in the circumferential direction to the outer surface of the mast M, so that the welding area can be increased overall, and as a result, the connection strength between each connecting block 21, 21' and the mast M can be effectively increased overall.

The projections 21t and the support holes 27 may be omitted from the opposing surfaces of the backs of the connecting blocks 21, 21' and the outer periphery of the mast M. In that case, the opposing surfaces, each of which is a flat surface, are welded directly in planar contact with each other.

In this embodiment, the projections 22t and recesses 22d on one and the other of the contact surfaces of the joining blocks 21, 21' are used as step-shaped projections and recesses, but the projections and recesses are not limited to the embodiment. For example, the projections and recesses may be fitted together.

In the above description of the structure of the base frame 11 of the base device 10, it was explained that multiple connecting blocks 21 are fixed at intervals to the outer periphery of the upper end of the square tube portion 11b, which has a cross-sectional shape that is approximately the same as that of the mast M. The connecting blocks 21 of the square tube portion 11b have the same structure as the connecting blocks 21 on the upper end side of the mast M, and the structure for fixing the blocks to the square tube portion 11b is also the same as the structure for fixing the connecting blocks 21, 21' to the mast M. In other words, the method for connecting the connecting block 21 of the square tube portion 11b to the connecting block 21' fixed to the lower end of the lowest mast M is the same as the method for connecting the connecting blocks 21, 21' between adjacent masts M described above.

Next, an example of the boom device 30 will be described with reference to Figures 11 to 13 and 15.

The boom device 30 comprises a boom train BT consisting of multiple booms B1-B4 arranged in series and pivotally connected to each other so that they can bend and swing, and a boom support base BS that is attached to the top of the mast device 20 (specifically, the upper end of the top mast M) and supports the first boom B1, which is the most proximal end of the boom train BT, via a pivot J1 so that it can be raised and lowered.

The boom support base BS comprises a fixed base 31 that is fixed to the upper part of the mast device 20, and a swivel base 32 that is supported on the fixed base 31 so as to be rotatable via a vertical swivel axis J5, and the upper part of the swivel axis J5 is connected to the swivel base 32 so that it rotates integrally with the swivel base 32.

In the fixed base 31, a plurality of swivel bearings 31b are fixed, which engage and support the swivel shaft J5 so that it cannot move axially relative to the fixed base 31 but can rotate relative to the fixed base 31. Between the swivel shaft J5 and a swivel actuator (not shown) in the fixed base 31, an interlocking mechanism (not shown) is provided, which forcibly rotates the swivel shaft J5 (and therefore the swivel base 32) around the vertical axis in conjunction with the actuator. The structure of the swivel actuator and the interlocking mechanism are well known in the technical field of crane devices with multi-stage booms, so the cover body 31c connected to the fixed base 31 and covering the actuator and the interlocking mechanism is only illustrated in Figures 12 and 13, and further explanation will be omitted.

A number of connecting blocks 21' of the same structure as those fixed to the lower end of the mast M are fixed to the outer periphery of the lower end of the fixed base 31, and the connecting block 21' on the fixed base 31 side and the connecting block 21 on the upper end side of the uppermost mast M are abutted and fastened to each other with bolts 25, thereby connecting the fixed base 31 and the uppermost mast M. In other words, the method of connecting the connecting block 21' on the fixed base 31 side and the connecting block 21 on the upper end side of the uppermost mast M is the same as the method of connecting the connecting blocks 21, 21' between adjacent masts M.

The swivel base 32 comprises a swivel base main body 32m to which the upper end of the swivel shaft J5 is fixed, and a pair of left and right standing wall portions 32s integrally erected on the upper surface of the swivel base main body 32m, with the two standing wall portions 32s connected by a number of connecting walls 32c. On the other hand, the base of the first boom B1 is formed in a U-shape in cross section so as to sandwich the two standing wall portions 32s from both the left and right sides.

The pair of left and right side wall portions 35 of the base of the first boom B1 and the adjacent upright wall portions 32s of the swivel base 32 are connected to each other via a pair of left and right short cylindrical pivots J1 so that they can rotate relative to each other. Thus, the first boom B1 is supported on the swivel base 32 so that it can be raised and lowered around the pivots J1. Therefore, the pivots J1 form a pivot support part that supports the first boom B1 on the swivel base 32 so that it can be raised and lowered.

The pivot axis J5 is formed in a cylindrical shape extending vertically, and the first relay pipe 38, which is held by the fixed base 31 and passes through the inside and outside of the fixed base 31, is inserted into its hollow portion. The upstream end (i.e., the lower end) of this first relay pipe 38 is liquid-tightly connected via a joint to the downstream end (i.e., the upper end) of the connection pipe 28 installed along the uppermost mast M described above. Meanwhile, the portion (upper part) of the first relay pipe 38 downstream of the pivot axis J5 is pulled out to the outside of the first boom B1 via one of the left and right pivot axes J1, and the pulled-out end, i.e., the downstream end, is liquid-tightly connected to the second relay pipe 39 described below, which is arranged on the boom row BT side.

In the boom row BT, a hydraulic cylinder C1 is interposed between the first boom B1 and the boom support base BS (particularly the upright wall portion 32s of the swivel base 32 described later), which forcibly raises and lowers the first boom B1 relative to the boom support base BS. Hydraulic cylinders C2 to C4 are interposed directly or via a link mechanism between adjacent booms in the boom row BT (i.e., between the first boom B1 at the base end and the next second boom B2, between the second boom B2 and the next third boom B3, and between the third boom B3 and the fourth boom B4 at the most distal end).

A hydraulic supply system (including, for example, an oil tank, hydraulic pump, control valve, etc.) installed on the boom support base BS (particularly the fixed base 31 described below) is connected to each of the hydraulic cylinders C1 to C4 via hydraulic piping (not shown) routed along the boom row BT. The supply and discharge of hydraulic pressure between this hydraulic supply system and each of the hydraulic cylinders C1 to C4 is controlled based on the operation of the operator. The configuration of the hydraulic control system is also well known in the technical field of multi-boom crane equipment.

A flexible blow-out tube 37 capable of blowing out ready-mixed concrete from its tip is attached to the tip of the fourth boom B4. The base end of this blow-out tube 37 and the downstream end of the aforementioned connection pipe 28 installed along the mast M are connected via the first relay pipe 38 installed on the boom support base BS and the second relay pipe 39 supported by each boom B1 to B4 of the boom row BT and arranged along each boom B1 to B4.

The second relay pipe 39 is bent at a folded portion that passes through the hollow pivots J2 to J4 that serve as the pivotal connections between the adjacent booms B1, B2; B2, B3; B3, B4, and is routed along the adjacent booms B1 to B4.

The upstream end of the second relay pipe 39 and the downstream end of the first relay pipe 38 are connected via a joint that connects them to be relatively rotatable around the axis of the pivot J1. Also, joints that connect the upstream pipe section and the downstream pipe section to be relatively rotatable are provided midway along the second relay pipe 39, particularly near each of the turnback sections. Therefore, these joints allow the second relay pipe 39 to smoothly follow the elevation and rotation of the first boom B1 and the bending and swinging of the adjacent booms B1, B2; B2, B3; B3, B4 relative to each other.

Meanwhile, the fixed base 31 is provided with a plurality of first attachment parts T1 that are used when the boom train BT is folded and in a horizontal position (see FIG. 15) or a vertical position (see FIG. 17) to lift the boom device 30 via the first ropes W1 with a crane and can be connected to the first ropes W1. In this embodiment, the first ropes W1 connected to each of the first attachment parts T1 are composed of a single wire 51 (see FIG. 15) each having an eye-shaped connected part 51a at both ends. Note that, since cranes that lift the boom device 30 are well known, the crane body is not shown in the embodiment, and only the crane hook 80 that is suspended from the boom tip of the crane body via a wire is shown.

In particular, in this embodiment, a pair of first mounting parts T1 arranged at intervals in a predetermined direction (hereinafter simply referred to as the width direction of the boom row BT) along the axis of the pivot J1 of the base of the first boom B1 are arranged on the fixed base 31 in two sets spaced apart in a horizontal direction perpendicular to the width direction (i.e., four places in total on the front, back, left and right sides of the fixed base 31). Note that three or more sets of pairs of first mounting parts T1 may be provided.

When the boom row BT is in a vertical position and the boom device 30 is lifted by a crane via the first ropes W1, if the boom support base BS is lifted by the same number of first ropes W1 via the first attachment parts T1 that are distributed at least in three or more places at intervals from each other, the boom device 30 can be lifted in a vertical position that is as stable as possible.

Each first mounting portion T1 is provided with a support wall 41w with a support hole 42 provided in four support brackets 41 each fixed to the fixed base 31, and a connector 40 detachably connected to the support wall 41w. The connector 40 has a U-shaped connecting hook 43 with a pair of arms 43a that sandwich the support wall 41w, and a mounting shaft 44 that passes through both arms 43a and the support hole 42 of the support wall 41w so as to be relatively rotatable. A knob 44a that also serves as a stopper and engages with one arm 43a is integrally connected to one end of the mounting shaft 44, and a stopper member 45 (e.g., a split pin) that engages with the other arm 43a is detachably engaged with the other end of the mounting shaft 44.

To attach the eye-shaped connected portion 51a of the first rope W1 to the first attachment portion T1, for example, the split pin 45 is removed and the attachment shaft 44 is pulled out of the support wall 41w to remove the connecting hook 43 from the support bracket 41, and then the connecting hook 43 is connected (inserted) to the connected portion 51a of the first rope W1, and then the connecting hook 43 is reattached to the support bracket 41 via the attachment shaft 44 in the reverse order to the previous procedure. In this case, the attachment shaft 44 functions as a locking member that closes the gap between both arms 43a of the connecting hook 43 when it is set on the connecting hook 43, thereby reliably maintaining the connection between the connecting hook 43 (and therefore the first attachment portion T1) and the connected portion 51a at the end of the first rope W1.

The structure of the connector 40 that connects the connected portion 51a of the first rope W1 to the first mounting portion T1 is not limited to the embodiment, and may be any connector structure that is attached to at least the fixed base 31 (support bracket 41) and can be attached and detached at any time to the connected portion 51a of the first rope W1. For example, as a variation of the connector 40 (not shown), a hook-shaped connector hook whose hook opening is always open, or a hook with a stopper piece that supports a stopper piece that can open and close the hook opening on the hook body and is always resiliently biased to a position that closes the hook opening, may be used as the connector.

The first mounting part T1 described above is provided on the boom support base BS, particularly the fixed base 31, via the support bracket 41, but it may also be provided directly on the fixed base 31. Also, instead of providing the first mounting part T1 on the fixed base 31, it may be provided on the swivel base 32 directly or via a support member such as a bracket.

In addition, a second attachment part T2 is provided midway along the first boom B1, which is used when lifting the boom device 30 with a crane via the second rope W2 while the boom row BT is in a horizontal position and can be connected to the second rope W2. The second rope W2 connected to the second attachment part T2 is composed of a single wire 52 (see FIG. 15) having eye-shaped connected parts 52a at both ends, similar to the first rope W1.

The installation location of the second mounting part T2 is set at a location such that when the boom device 30 is lifted by a crane via the first and second ropes W1 and W2 with the boom row BT in a horizontal position, the center of gravity of the entire boom device 30 (see reference symbol G in Figure 15) is midway between the first and second mounting parts T1 and T2 in the longitudinal direction of the boom row BT.

The second mounting part T2 also includes a connecting arm 46 that straddles the middle part of the first boom B1 from above, and a connector 40 that is detachably connected to the upper support wall 46w of the connecting arm 46, and a pair of bifurcated legs 46a of the connecting arm 46 are rotatably supported by shafts 46p on the left and right side walls of the first boom B1. The connector 40 has the same structure as the connector 40 of the first mounting part T1 described above, that is, a U-shaped connecting hook 43 is rotatably supported by a mounting shaft 44 in a support hole provided in the upper support wall 46w.

Then, by removing the mounting shaft 44 and separating the connecting hook 43 from the upper support wall 46w, the connecting hook 43 is engaged with the eye-shaped connected portion 51a of the second rope W2 and then reattached to the upper support wall 46w via the mounting shaft 44, so that the second rope W2 can be detachably connected to the upper support wall 46w of the first boom B1 via the connector 40 and the connecting arm 46. Note that the connector 40 of the second mounting part T2, like the first mounting part T1, is not limited to the embodiment, and for example, variations not shown in the figures described for the first mounting part T1 can also be adopted.

As is clear from Fig. 15, when the boom device 30 is hoisted by a crane via the first and second ropes W1 and W2 with the boom row BT in a horizontal position, in this embodiment, the position of the first attachment part T1 relative to the boom support base BS is set so that the first rope W1 passes closer to the tip of the first boom B1 than the axis of the pivot support part (pivot J1) of the boom support base BS relative to the first boom B1 in a side view. In this case, in the illustrated example of Fig. 15, the first rope W1 is connected to the first attachment part T1 on the tip side of the first boom B1 (right side in Fig. 15), but it may also be connected to the first attachment part T1 on the opposite side (left side in Fig. 15).

The above-mentioned installation position of the first mounting part T1 is determined from the viewpoint of effectively preventing the boom row BT from opening and swinging relative to the boom support base BS when the boom device 30 is hoisted in the above-mentioned horizontal position as described below. However, if such a suppression effect is not important, the installation position of the first mounting part T1 relative to the boom support base BS may be set so that the first rope W1 passes outside the above-mentioned pivot support part (pivot J1) in a side view, i.e., on the left side in Figure 15.

Furthermore, the base of the first boom B1 is provided with a third attachment part T3 for holding the second rope W2 on the first boom B1 in cooperation with the second attachment part T2 when not in use. The third attachment part T3 includes, for example, an upper support wall 49 with a support hole 48 protruding from the upper surface of the base of the first boom B1, and a connector 40 detachably connected to the upper support wall 49. This connector 40 also has the same structure as the connector 40 of the first attachment part T1 described above, that is, a U-shaped connecting hook 43 is rotatably supported via a mounting shaft 44 in a support hole provided in the upper support wall 49w. The connector 40 of the third attachment part T3 is also not limited to the embodiment, and for example, a variation not shown in the figure described for the first attachment part T1 can be adopted.

Furthermore, the third mounting part T3 described above can be omitted. In that case, the second rope W2, which is not required during concrete pouring work, can be removed from the second mounting part T2 (first boom B1), and the second rope W2 can be attached to the second mounting part T2 when assembling and dismantling the distributor D.

Next, an example of a boom device lifting auxiliary device that can be used when lifting the boom device 30 with a crane via multiple first ropes W1 while the boom row BT is in a vertical position using the concrete supply distributor D of this embodiment will be described with reference to Figures 17 and 18.

That is, as shown in FIG. 17, the auxiliary device is provided with a hanging rod 50 whose both ends are detachably connected to at least one pair of the first ropes W1 when the first ropes W1 are connected to all the first attachment parts T1 and the boom device 30 is hoisted by a crane in a vertical position via the first ropes W1. The hanging rod 50 is formed as a rod-shaped body having a length greater than the maximum width of the boom row BT in a predetermined direction and has rigidity. The connection position of the hanging rod 50 to the first ropes W1 is set so that the hanging rod 50 can straddle the boom device 30 near the top end of the boom device 30 in a vertical position. A pair of triangular support plates 55 are fixed (for example, welded) to both ends of the hanging rod 50, and a pair of support holes 56 are provided at intervals on the support plates 55.

The first rope W1 is divided into a first rope portion W1u above the hanging rod 50 and a second rope portion W1d below. The connected portions 51a of the first and second rope portions W1u and W1d are each detachably connected to the corresponding support plate 55 via a pair of upper and lower connectors 40. The pair of upper and lower connectors 40 each have the same structure as the connector 40 of the first mounting part T1 described above, that is, a U-shaped connecting hook 43 is rotatably supported by a pair of support holes 56 of the support plate 55 via a mounting shaft 44. Therefore, the attachment and detachment operation of the connector 40 used for this hanging rod 50 is also the same as that of the connector 40 of the first mounting part T1.

The structure of the connector 40 used with the hanging rod 50 is also not limited to the embodiment, and can be, for example, a variation (not shown) described for the first attachment portion T1.

Furthermore, when the boom device 30 is hoisted by a crane via a plurality of first ropes W1 with the boom row BT in a vertical position as described above, the auxiliary device includes an annular support 60 that is detachably connected to at least two of the first ropes W1 in the vertical direction between the lifting rod 50 and the first mounting portion T1 in the middle (in the illustrated example, at a position near the upper end of the boom device 30) and surrounds all of the first ropes W1 and the boom row BT.

This annular support 60 is intended to prevent the boom row BT from tilting more than a predetermined angle with the first attachment part T1 as the tilting fulcrum when the boom device 30 is lifted via the multiple first ropes W1 with the boom row BT in a vertical position. The annular support 60 is composed of a flexible and sturdy ring-shaped body (e.g., an endless wire rope, chain, etc.), and in the middle of it, connecting members 61 are fixed (e.g., crimped, welded, bolted, etc.) to at least two of the first ropes W1 in the middle (parts close to the suspension rod 50) and detachably connected via connectors 40.

The connector 40 used to connect the annular support 60 has the same structure as the connector 40 of the first mounting part T1 described above, that is, a U-shaped connecting hook 43 is rotatably supported in the support hole 62 of the connecting member 61 via the mounting shaft 44. Therefore, the attachment and detachment operation of the connector 40 used to connect the annular support 60 is also the same as that of the connector 40 of the first mounting part T1. The structure of the connector 40 used for the annular support 60 is also not limited to the embodiment, and for example, the variation not shown described for the first mounting part T1 can be adopted.

Meanwhile, a grease pump Gi as a grease injection section, a distribution valve Vd connected to the grease pump Gi via a single grease base pipe GL0, and a plurality of grease pipes, i.e., the first to fourth grease pipes GL1 to GL4, connected in parallel to the grease base pipe GL0 (and therefore the grease pump Gi) via the distribution valve Vd, are fixed and supported on the fixed base 31 of the boom support base BS. The grease pump Gi is equipped with, for example, a grease holding section capable of storing a predetermined amount of grease, and a grease pushing means such as a piston capable of manually pumping the stored grease in the grease holding section to the grease base pipe GL0, and its structure is conventionally known. The distribution valve Vd distributes the grease that flows into it to the first to fourth grease pipes GL1 to GL4 in equal volumes, and its structure is also conventionally known.

The first to fourth grease pipes GL1 to GL4 are mostly flexible, and their intermediate portions are bundled together and extend upward outside the fixed base 31, and then pass through the rotating base 32 and the base of the first boom B1. Of the first to fourth grease pipes GL1 to GL4 that extend from the base to the outside of the first boom B1, the first grease pipe GL1 in particular extends to the vicinity of the pivot J1 that serves as the pivot support for the first boom B1, and can supply grease to the parts to be lubricated around the pivot J1 (for example, the fitting portion between the outer periphery of the pivot J1 and the bearing, and the fitting portion between the inner periphery of the pivot J1 and the second relay pipe 39).

The second to fourth grease pipes GL2 to GL4 protruding from the first boom B1 are fixed along the first boom B1 and extend to the tip of the first boom B1. At the tip of the first boom B1, the second grease pipe GL2 of the second to fourth grease pipes GL2 to GL4 extends to the vicinity of the pivot J2 that is the pivotal connection part of the first and second booms B1 and B2, and can supply grease to the lubricated parts around the pivot J2 (for example, the fitting part between the outer periphery of the pivot J2 and the bearing, and the fitting part between the inner periphery of the pivot J2 and the second relay pipe 39). On the other hand, the third and fourth grease pipes GL3 and GL4 are fixed along the second boom B2 and extend to the tip of the second boom B2.

At the tip of the second boom B2, the third and fourth grease pipes GL3, GL4, especially the third grease pipe GL3, extend to the vicinity of the pivot J3 that is the pivotal connection part of the second and third booms B2, B3, and can supply grease to the lubricated parts around the pivot J3 (for example, the fitting part between the outer periphery of the pivot J3 and the bearing, and the fitting part between the inner periphery of the pivot J3 and the second relay pipe 39). On the other hand, the fourth grease pipe GL4 is fixed along the third boom B3 and extends to the tip of the third boom B3.

In addition, at the tip of the third boom B3, the fourth grease pipe GL4 extends to the vicinity of the pivot J4, which is the pivot connection part of the third and fourth booms B3 and B4, and can supply grease to the lubricated parts around the pivot J4 (for example, the fitting part between the outer periphery of the pivot J4 and the bearing, and the fitting part between the inner periphery of the pivot J4 and the second relay pipe 39).

Thus, the first to fourth GL1 to GL4 extend to each of the lubricated parts of the multiple booms B1 to B4 of the boom row BT, respectively, and supply grease to those lubricated parts.

As is clear from FIG. 12 and FIG. 21, the first to fourth backup pipes GE1 to GE4 branch off from the first to fourth grease pipes GL1 to GL4. These backup pipes GE1 to GE4 have grease injection ports GEi1 to GEi4 as backup grease injection sections that can individually inject grease into the corresponding backup pipes GE1 to GE4. Each grease injection port GEi1 to GEi4 is provided with a manual plug that normally closes it, and each plug can open and close the grease injection port GEi1 to GEi4 at any time. In addition, the first to fourth grease pipes GL1 to GL4 are provided with a check valve Vc between the branching section of the grease pipes GL1 to GL4 where the backup pipes GE1 to GE4 branch off and the distribution valve Vd to prevent grease from flowing back from the grease pipes GL1 to GL4 to the distribution valve Vd.

As shown by the dashed line in FIG. 21, a backup pipe GE0 for grease supply may be branched off from the grease base pipe GL0 (between the check valve Vc and the distribution valve Vd), and a manually opened and closed plug that normally closes is attached to the backup pipe GE0. Thus, by using this backup pipe GE0, grease can be supplied to the grease base pipe GL0 even if the grease pump Gi breaks down.

Furthermore, in the grease supply system described above, the backup system (backup pipes GE0, GE1 to GE4 and check valve Vc) may be omitted.

According to the grease supply structure of this embodiment, grease can be supplied simultaneously to the multiple grease pipes GL1 to GL4 from a single common grease pump Gi via a distribution valve Vd. This allows grease to be quickly and easily replenished to the lubricated parts of the multiple booms B1 to B4 in the boom row BT even when the boom row BT is still attached to the boom support base BS (i.e., without lowering the booms B1 to B4), thereby shortening the work time and reducing the number of steps required for grease replenishment. Furthermore, by making grease replenishment easier in this way, it is possible to effectively avoid situations where the booms are left without grease replenishment, which is also effective in preventing failures and reduced durability of the boom device 30.

In addition, a check valve Vc is provided in the grease pipes GL1 to GL4 between the branching point of the backup pipes GE1 to GE4 and the distribution valve Vd to prevent grease from flowing back toward the distribution valve Vd. This makes it possible to reliably prevent a situation in which, when grease is replenished from the backup pipes GE1 to GE4 due to a breakdown in the distribution valve Vd, the replenished grease flows back toward the distribution valve Vd and fails to reach the parts of the booms B1 to B4 that need to be lubricated.

Next, the operation of the embodiment will be explained with reference to Figures 14 to 19.

When the distributor D of this embodiment is used, for example, at a building construction site, a reinforced concrete floor slab FS1 of the lowest level (e.g., the first floor) is constructed in advance, and the floor slab FS1 has through holes H that connect the spaces above and below it. Then, an assembly process is carried out in which the distributor D is assembled and installed on the floor slab FS1, and a process is carried out in which the upper floor slab and associated walls are constructed based on the pouring of ready mixed concrete using the installed distributor D.

Once the upper floor slabs FS2, FS3, etc. have been constructed in this manner, a process is carried out in which the distributor D as a whole is placed on the upper floor slab (this process is called "re-laying" on-site) in order to construct the upper floor slabs, etc. The above-mentioned assembly process and re-laying process of the distributor D will now be described in order.
[Assembly process]
First, as illustrated in Figure 14 (A), the base device 10 of the distributor D is suspended by a crane and lowered to approximately the same level as the floor slab FS1, and the outrigger 16 in the deployed position 16A is placed on the floor slab FS1 and fixed with conventional fixing means (for example, an anchor bolt passing through the outrigger 16).

Next, as shown in FIG. 14(B), the mast device 20, which is previously assembled at another location together with the ladder 23, connecting pipes 28, and work platform 24 and one or more masts M, is suspended by a crane and placed on the base device 10 (on the square tube portion 11b of the base frame 11), and connected to the base device 10 via the connecting blocks 21, 21' and bolts 25.

Next, as shown in FIG. 14(C), the boom device 30, which has been assembled in advance as an assembly of the boom row BT and the boom support base BS at a different location, is folded up and placed in a substantially horizontal, sideways position, and the connected parts 51a at the lower ends of the first and second ropes W1, W2 are respectively connected to the fixed base 31 and the first and second mounting parts T1, T2 on the first boom B1. Then, the upper parts of the first and second ropes W1, W2 are lifted up by a crane and placed on the upper end of the top mast M of the mast device 20 as shown in FIG. 14(D), and connected to the top mast M via the connecting blocks 21, 21' and bolts 25. This connecting work is performed by a worker on the work platform 24 in cooperation with the crane operator.

Then, the first rope W1 is removed from the crane hook 80 and the first mounting part T1 and stored in a separate storage location. The upper end of the second rope W2 is removed from the crane and attached to the third mounting part T3, while the lower end is left connected to the second mounting part T2.

The downstream end (upper end) of the connection pipe 28 fixed to the mast M is liquid-tightly connected to the upstream end (lower end) of the first relay pipe 38 on the fixed base 31 side via a joint, and this connection work is also performed by a worker on the workbench 24. Meanwhile, the upstream end (lower end) of the connection pipe 28 is liquid-tightly connected via a joint to a concrete pressure pipe extending from an external concrete pump (not shown). This makes it possible to pressure-feed and supply fresh concrete from the concrete pump to the connection pipe 28, the first and second relay pipes 38, 39, and the blow-out tube 37 in sequence.

Thus, the installation of the distributor D on the floor slab FS1 of the lowest level is completed, and from this state the distributor D can supply ready mixed concrete to the desired casting location from the blow-out tube 37 at the end of the boom row BT by appropriately bending the booms B1 to B4 of the boom row BT relative to each other and rotating the swivel base 32 (and therefore the boom row BT). This makes it possible to sequentially build the floor slab FS2 and walls of the next level, and then the floor slab FS3 and walls of the next level.

Once the upper floor slabs FS2, FS3 and wall bodies have been built in this manner, the next re-laying process is performed in which the entire distributor D is placed, for example, on the floor slab FS2 in order to construct the upper floor slab FS4, etc.
[Refilling process]
In this step, for example, the connection pipe 28 fixed to the mast M is disconnected from the concrete pump-connected concrete pumping pipe, and the outriggers 16 are released from the floor slab FS1. Then, as shown in Fig. 16(E), the folded boom row BT is raised and swung up until it is in a substantially vertical position, and in this state, the connected parts 51a at the lower ends of the four first ropes W1 are respectively connected to the four first mounting parts T1 of the boom support base BS (fixed base 31). Then, the connected parts 51a at the upper ends of the first ropes W1 are engaged with the crane hook 80, and the entire distributor D is lifted by a crane.

Next, as shown in FIG. 16(F), the outriggers 16 are rotated to the storage position 16B so that the outriggers 16 do not interfere with the periphery of the through-hole H in the floor slab FS2 of the upper floor when the distributor D is raised. Then, the entire distributor D is lifted and raised by a crane until the base device 10 is at approximately the same level as the floor slab FS2 of the upper floor.

After the ascent, as shown in FIG. 16(G), the outriggers 16 are deployed again to the deployment position 16A, and then placed and fixed on the floor slab FS2 of the upper floor. Next, the lower ends of all the first ropes W1 are removed from the first mounting parts T1 of the fixing base 31 and stored in another storage location. The upper end of the extension pipe 28' extending downward is connected and fixed to the upstream end (lower end) of the connection pipe 28 fixed to the mast M, and the middle of the extension pipe 28' is supported by a beam or the like around the through hole H of the floor slab (for example, floor slab FS2) of the lower floor via a fixing means 81. Then, if a concrete pressure pipe connected to the concrete pump is connected to the lower end of the extension pipe 28', it becomes possible to pressure-feed and supply ready-mixed concrete to the connection pipe 28, the first and second relay pipes 38, 39, and the blow-out tube 37 in sequence.

Thus, the distributor D's work of transferring concrete to the upper floors is completed, and from this state the distributor D can lay down the first boom B1 of the boom row BT, bend the booms B1 to B4 relative to each other as appropriate, and rotate the swivel base 32 (and therefore the boom row BT), thereby supplying ready mixed concrete from the blow-out tube 37 at the end of the boom row BT to the desired casting location on the upper floors. This makes it possible to construct the floor slab FS4 and walls on the upper floors.

By carrying out the above-mentioned replacement process in sequence as the floor slab FS increases in level, it becomes possible to easily construct mid-rise and high-rise buildings using the same distributor D.

According to the present embodiment described above, the first mounting portion T1, which is used when lifting the boom device 30 via the first rope W1 with a crane while the folded boom row BT is in a horizontal or vertical position and can be connected to the first rope W1, is provided on the boom support base BS (fixed base 31 in the illustrated example), so that the boom device 30 can be lifted via the first rope W1 with a crane in the state where the boom row BT and the boom support base BS are assembled together. This eliminates the need to assemble the boom device 30 on a high mast device 20 as in the conventional case, and thus improves the ease of assembly of the boom device 30.

In particular, during so-called rearrangement work in which the boom device 30 is lifted with the boom row BT in a vertical position, the entire boom device 30 is lifted, particularly at the boom support base BS, via the multiple first mounting parts T1 and multiple first ropes W1 of the boom support base BS, so the load on the connection between the base end of the boom row BT (base of the first boom B1) and the boom support base BS during lifting can be effectively reduced compared to when lifting with the boom row BT as in the past. This simplifies the structure of the connection and ultimately reduces costs.

The boom support base BS of the embodiment includes a fixed base 31 fixed to the upper part of the mast device 20, and a swivel base 32 supported rotatably around a swivel axis J5 on the fixed base 31, which supports the base of the first boom B1 so that it can be raised and lowered. The first mounting part T1 is provided on the fixed base 31. As a result, the fixed base 31 of the boom support base BS in particular is lifted by the first rope W1, and therefore the load on the swivel mechanism (i.e., the swivel axis J5, swivel bearing 31b, etc.) that rotatably supports the fixed base 31 on the swivel base 32 is reduced compared to the case where the swivel base 32 is lifted by the first rope W1, which simplifies the structure of the swivel mechanism and reduces costs.

In the embodiment, a second attachment portion T2 that can be connected to the second rope W2 and is used when lifting the boom device 30 with a crane via the second rope W2 when the boom row BT is in a particularly horizontal position is provided midway on the first boom B1. This makes it possible to lift the boom device 30 with a crane via the first and second ropes W1, W2 (and therefore with a long horizontal support span) when the boom row BT is in a horizontal position, thereby stabilizing the lifting support and improving workability.

Furthermore, in the embodiment, when the boom device 30 is hoisted by a crane via the first and second ropes W1 and W2 with the boom row BT in a horizontal position, the position of the first attachment part T1 relative to the boom support base BS is set so that the first rope W1 passes through the tip side of the first boom B1 rather than the axis of the pivot support part (i.e., pivot J1) of the boom support base BS relative to the first boom B1 in a side view. As a result, during the process of hoisting the boom device 30 with the boom row BT in a horizontal position, the boom row BT can be effectively prevented from opening and swinging relative to the boom support base BS by the moment exerted on the boom support base BS by the lifting load applied to the boom support base BS by the first rope W1 via the first attachment part T1, and therefore the simple opening prevention structure utilizing the lifting load improves the safety of the work.

In addition, a third attachment part T3 is provided at the base of the first boom B1 for holding the second rope W2 on the first boom B1 in cooperation with the second attachment part T2 when not in use. As a result, even if one end of the second rope W2 remains connected to the second attachment part T2 when not in use, the other end of the second rope W2 can be connected and held to the third attachment part T3, thereby preventing the second rope W2 from interfering with the concrete pouring work and holding the second rope on the first boom. Moreover, the next time the second rope W2 is used, the effort of connecting one end of the second rope W2 to the second attachment part T2 is eliminated, thereby improving work efficiency.

In particular, when performing the above-mentioned rearrangement work, when the boom row BT is in a vertical position and the first ropes W1 are connected to all of the first mounting parts T1 and the boom device 30 in the vertical position is hoisted by a crane via these first ropes W1, it is desirable to connect both ends of a suspension rod 50 that is longer in the width direction than the maximum width of the boom row BT to the middle of a pair of first ropes W1 aligned in the width direction of the boom row BT (particularly above the upper end of the boom row BT). In this case, the pair of first ropes W1 with both ends of the suspension rod 50 connected in the middle are subjected to the tensioning action of the suspension rod 50 interposed between the two first ropes W1, thereby reliably preventing excessive interference of the two first ropes W1 with the boom row BT.

When lifting the boom device 30 in a vertical position via the first ropes W1 with a crane for the above-mentioned reloading work, it is desirable to connect an annular support 60 surrounding all of the first ropes W1 and the boom row BT to the middle of at least one of the first ropes W1 between the lifting rod 50 and the first mounting part T1 in the vertical direction (particularly the part close to the lifting rod 50). In this case, the annular support 60 can suppress the boom row BT from tilting excessively (i.e., more than a predetermined angle) with the first mounting part T1 as the tilting fulcrum, so that it is possible to effectively prevent the boom row BT from tilting too much and tipping over when lifting the boom device 30.

When the boom device 30 in the vertical position described above is hoisted by a crane, the use of both the hoisting rod 50 and the annular support 60 may be omitted. It is also possible to use only the hoisting rod 50 without using the annular support 60. It is also possible to use only the annular support 60 without using the hoisting rod 50. In this case, for example, it is possible to hoist the boom device 30 in the vertical position with only one first rope W1 via one first mounting part T1 on the boom support base BS side, and at that time, the annular support 60 connected to the first rope W1 can be used to prevent the boom device 30 from falling over.

In addition, in carrying out the [Reloading Process], in the embodiment, the boom device 30 in the vertical position is lifted by a crane via the first rope W1 as shown in Figure 16. However, even if the boom device 30 is lifted via the first and second ropes W1 and W2 while in the horizontal position, the reloading work may be carried out with the boom device 30 in the horizontal position, as long as the boom device 30 does not interfere with the already constructed structure (e.g., the floor slab of the upper layer, etc.).

Although an embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments can be implemented within the scope of the present invention.

For example, in the embodiment, the mast assembly 20 is formed of two masts M arranged in a vertical line and connected to each other, and the boom assembly 30 is replaced together with the mast assembly 20 and the base assembly 10. However, depending on the length of the masts M and the work conditions at the site, the mast assembly 20 may be formed of one mast M, or the mast assembly 20 may be formed by connecting three or more masts M in a vertical line.

In the above embodiment, the connecting blocks 21, 21' are fixed to the outer periphery of the adjacent ends of the adjacent masts M at intervals in the circumferential direction, and are vertically adjacent to each other, facing and abutting in the vertical direction, and the abutting surfaces are connected to each other with bolts 25. However, other connecting means (e.g., welding, riveting, pinning, etc.) than bolts can be used as the connecting means. Also, the connecting blocks 21, 21' may be adjacent to each other in the circumferential direction of the masts M, facing and abutting in the circumferential direction, and the abutting surfaces may be connected to each other with bolts 25 or other connecting means. In this case, the bolts or fixing pins that connect the abutting surfaces to each other are horizontal (i.e., facing in the circumferential direction).

In the embodiment, the deployed position 16A of the outrigger 16 in the base device 10 can be set to any of three deployed positions 16A0, 16A1, and 16A2, but the deployed position 16A of the outrigger 16 may be one pattern, or two patterns, or four or more patterns. If the deployed position 16A is set to one or two patterns, which is fewer than the three patterns of the embodiment, the number of pin insertion holes provided on the base side of the outrigger 16 can be less than that of the embodiment (i.e., one or two).

In the above embodiment, the outriggers 16 are manually rotated between the storage position 16B and the deployment position 16A, but the outriggers 16 may be rotated automatically by an actuator (not shown) provided between the outriggers 16 and the base body 10m.

In the above embodiment, the boom train BT in the boom device 30 is shown to be composed of first to fourth booms B1 to B4 arranged in series and capable of pivoting relative to one another, but the boom train BT only needs to have at least two booms connected together and is not limited to the number of booms in the embodiment.

In addition, in the above embodiment, the first and second ropes W1 and W2 do not use a length adjustment aid such as a conventionally known chain block, but such a length adjustment aid may be used to connect at least a portion of the first and second ropes W1 and W2 to at least a portion of the first and second mounting parts T1 and T2 while making the length adjustable.

In the above embodiment, the upper and lower frames 12, 13 are connected to the base frame 11 via the surrounding frames 14k, 15k of the upper and lower bearings 14, 15. However, the upper and lower frames 12, 13 may be directly connected to the base frame 11, or may be connected via other members that are separate and independent from the surrounding frames 14k, 15k.

In the above embodiment, the upper and lower bearings 14, 15 are composed of the bearing bodies 14b, 15b and the surrounding frames 14k, 15k connected thereto, and the bearing bodies 14b, 15b are connected to the upper and lower frames 12, 13 via the surrounding frames 14k, 15k. However, the surrounding frames 14k, 15k may be omitted, and the upper and lower frames 12, 13 may be connected directly (i.e., without the surrounding frames 14k, 15k) to the mounting surfaces provided on the outer sides of the bearing bodies 14b, 15b.

In the above embodiment, in the [assembly process] of the distributor D, after the base device 10 and mast device 20 are installed at the site as shown in Figures 14 (A) to (D), the boom row BT (in this embodiment, the first boom B1) of the boom device 30 with the boom row BT in a horizontal position and the boom rotation base BS (in this embodiment, the fixed base 31) are suspended by a crane via the first and second ropes W1, W2 and the first and second mounting parts T1, T2, and the fixed base 31 is connected to the uppermost mast M in this suspended state. In contrast, in the [assembly process] of distributor D, as shown in the flow from Figure 14 (A) (B) to Figure 19 (C') (D'), after the base device 10 and mast device 20 are installed on-site, the fixed base 31 of the boom device 30 with the boom row BT in the vertical position can be suspended by a crane via the four first ropes W1 and the first mounting part T1, and the fixed base 31 can be connected to the uppermost mast M in this suspended state.

In the above embodiment, in the [assembly process] of the distributor D, as shown in Figures 14 (A) to (D), the base device 10 is first installed on the floor slab FS1 of the lowest level of the site (for example, the basement or first floor), and then the mast device 20 is constructed and the boom device 30 is attached above it. However, prior to the [assembly process] of the distributor D (and therefore without using the distributor D), a lower level slightly above the lowest level (for example, the floor slab FS2 or FS3 in the embodiment) may also be constructed, and the base device 10 may first be installed on the upper floor slab FS2 or FS3 to start the [assembly process].

In addition, in the base body 10m of the base device 10 of the above embodiment, as shown simply in Figures 20 (A) and (B), the upper bearings 14 are connected to the adjacent ends of adjacent upper frames 12 so that at least a part of the upper bearings 14 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent upper frames 12 along the longitudinal direction in a planar view, and the lower bearings 15 are connected to the adjacent ends of adjacent lower frames 13 so that at least a part of the lower bearings 15 is located inward of the intersection O of the extension lines of the outer surfaces of adjacent lower frames 13 along the longitudinal direction in a planar view. In contrast, as another embodiment of the present invention, as shown simply in Figures 20(C) and (D), the upper bearings 14 are connected to the adjacent ends of the adjacent upper frames 12 so that at least a portion of the upper bearings 14 is located inside the intersection O' between the outer sides of the adjacent upper frames 12 along the longitudinal direction in a plan view (i.e., the square tube portion 11b side, in other words, the center side of the base body 10m), and the lower bearings 15 are connected to the adjacent ends of the adjacent lower frames 13 so that at least a portion of the lower bearings 15 is located inside the intersection O' between the outer sides of the adjacent lower frames 13 along the longitudinal direction in a plan view (i.e., the square tube portion 11b side, in other words, the center side of the base body 10m).

In this alternative embodiment, for example, adjacent ends of adjacent upper frames 12 are directly fixed to each other (e.g., welded, bolted, etc.), and the upper part of the upper bearing 14 is fixed to the lower surface of the adjacent end of the upper frame 12 (e.g., welded, bolted, etc.). Also, adjacent ends of adjacent lower frames 13 are directly fixed to each other (e.g., welded, bolted, etc.), and the upper part of the lower bearing 15 is fixed to the upper surface of the adjacent end of the lower frame 13 (e.g., welded, bolted, etc.).

Furthermore, the base device 10 of this alternative embodiment can achieve essentially the same effects as the base device 10 of the previously described embodiment.

D: Distributors L1, L2: Maximum width in the vertical direction, length in the longitudinal direction O, O': Intersection X: Imaginary vertical plane 10: Base device 11: Base frame 12, 13: Upper frame, lower frame 12e, 13e: End surface 14, 15: Upper bearing, lower bearing 14b, 15b: Bearing body 14k, 15k: Enclosure frame 14kf, 15kf: Mounting surface 16: Outriggers 16A, 16B: Deployed position, stored position 16ba: Bearing cylinder portion 17: Rotating support shaft 20: Mast device 30: Boom device

Claims (4)

A concrete supply distributor including a base device (10), a mast device (20) supported in an upright position on the base device (10), and a boom device (30) mounted on the mast device (20),
The base device (10) comprises a base frame (11), a plurality of upper frames (12) fixed to the base frame (11) and arranged so as to surround the base frame (11), upper bearings (14) each having at least a portion located on the inner side of an intersection (O') between outer side surfaces along the longitudinal direction of adjacent upper frames (12) in a plan view or on the inner side of an intersection (O) between extension lines of the outer sides and each connected to adjacent ends of the adjacent upper frames (12), and a plurality of lower frames (12) fixed to the base frame (11) and arranged at intervals directly below the upper frames (12) in correspondence with the respective upper frames (12). the lower frame (13), at least a portion of which is located inward of an intersection (O') between outer side surfaces along the longitudinal direction of adjacent lower frames (13) in a plan view or inward of an intersection (O) between extension lines of the outer side surfaces, and which is coupled to adjacent ends of the adjacent lower frames (13); a plurality of outriggers (16) each having a bearing cylinder portion (16ba) at a base portion (16b) and each bearing cylinder portion (16ba) is disposed between the corresponding upper bearing (14) and lower bearing (15); and a rotating support shaft (17) inserted into the upper bearing (14), the bearing cylinder portion (16ba), and the lower bearing (15), which are coaxially aligned;
A concrete supply distributor, characterized in that the outrigger (16) is rotatable around the pivot shaft (17) between a stored position (16B) along the upper frame (12) and the lower frame (13) and a deployed position (16A) extending outward from the stored position (16B). The upper bearing (14) and the lower bearing (15) each include a cylindrical bearing body (14b, 15b) and a surrounding frame (14k, 15k) surrounding the outer periphery of the bearing body (14b, 15b),
A concrete supply distributor as described in claim 1, characterized in that the enclosing frame (14k, 15k) has a flat mounting surface (14kf, 15kf) perpendicular to the longitudinal direction of the upper frame (12) or the lower frame (13), and the end surface (12e, 13e) of the upper frame (12) or the lower frame (13) abuts and is fixed to the mounting surface (14kf, 15kf). The concrete supply distributor according to claim 2, characterized in that the contact surface between the mounting surface (14kf, 15kf) and the corresponding upper frame (12) or lower frame (13) is located outside a virtual vertical plane (X) that passes through the center line of the upper bearing (14) or lower bearing (15) surrounded by the enclosure (14k, 15k) having the mounting surface (14kf, 15kf) and is parallel to the axis of the corresponding upper frame (12) or lower frame (13). The concrete supply distributor according to any one of claims 1 to 3, characterized in that each of the outriggers (16) is set to a maximum vertical width (L1) smaller than the mutual distance between the opposing faces of the upper frame (12) and the lower frame (13) so that it can enter the space between the corresponding upper frame (12) and the lower frame (13) when stored, and a longitudinal length (L2) such that the tip (16a) of the outrigger (16) when stored does not interfere with the base (16b) of the adjacent outrigger (16).

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