JP7554482B2 - Fixing device for shoring and supporting pipes used therein - Google Patents

Description

The present invention relates to supports that support structures from below, for example in civil engineering and construction works such as tunnels and bridges, and to fixing devices for support pipes used therein.

At civil engineering and construction sites, various works are carried out while structures are supported from below by shoring. Generally, square pillars, which are made of four pipes with connecting members welded together, are used as shoring.
However, the square support pillar is made of four pipes welded together and cannot be disassembled, making it heavy and inconvenient to transport.
Additionally, at civil engineering and construction sites, it is necessary to assemble shoring and scaffolding at the top to match the height of the building, which means that the number of supports (support pipes), horizontal beams, handrails, steps, etc. required for the entire construction project is enormous.
Therefore, for example, Patent Document 1 discloses a technique for constructing a support structure by providing a support bracket with a wedge hole on the support and engaging a horizontal member with the wedge hole to connect multiple supports. This makes it possible to disassemble the support structure and use the supports to construct the support structure.

JP 2014-105572 A

However, the above-mentioned shoring structure is configured to connect multiple pillars at their longitudinal midpoints, and not at their upper or lower ends. This means that the relative positional relationship of the multiple pillars cannot be properly maintained at the upper and lower ends. For example, this could make it impossible to support a structure in a stable manner, and could also cause problems when supporting the pillars with jacks, etc.

The present invention was made in consideration of these circumstances, and aims to provide a support structure and a fixing device for the support pipes used therein, which allows the support structure to be constructed using support pipes, is disassembled, and enables stable support of structures and support by jacks, etc.

The support structure according to the present invention, which is in accordance with the above-mentioned object, comprises four support pipes each having a set of four U-shaped fasteners in a plan view, the set of fasteners being arranged in an upright state at each vertex position of an imaginary right-angled rectangle in a plan view, the set of fasteners being provided at 0 degree, 90 degree, 180 degree, and 270 degree positions on the circumference of a pipe material having a circular cross section, at a predetermined pitch in the vertical direction of the pipe material;
In a support structure that supports a structure from below, a wedge member provided at both ends of a horizontal pipe body is attached to the opposing fasteners provided at the same height position of adjacent support pipes, and a short connecting pipe is provided to connect the support pipes to each other,
A pair of fixing devices are removably attached to both ends of the support pipe in the vertical direction,
Each of the fixing devices comprises a first base plate against which the upper and lower ends of the support pipe can abut, a second base plate having four through holes through which the support pipe can be inserted, and a stay member which is attached and fixed between the first and second base plates, arranges the first base plate and the second base plate in parallel, and guides the end of the support pipe inserted into the through holes so that it abuts against the first base plate.

In the support structure according to the present invention, the stay member is composed of four plates fixed in an upright position between the first and second base plates so as to surround the four support pipes, and it is preferable that both ends of each plate are bent to follow the opposing sides of the outer periphery of the adjacent support pipes with a gap.

In the shoring according to the present invention, it is preferable that the first base plate of the fixing device provided at the lower end of the support pipe has a drain hole formed at a position corresponding to the inside of the support pipe when viewed in a plan view.

The fixing device for support pipes according to the present invention, which is in accordance with the above-mentioned object, comprises four support pipes each having a group of four U-shaped fasteners in a plan view, the fasteners being arranged in an upright state at each vertex of an imaginary right-angled rectangle in a plan view, the group of fasteners being provided at 0 degrees, 90 degrees, 180 degrees, and 270 degrees on the circumference of a pipe material having a circular cross section, at a predetermined pitch in the vertical direction of the pipe material;
A support pipe fixing device for use in support work for supporting a structure from below, which has wedges provided at both ends of a horizontal pipe body attached to opposing fasteners provided at the same height position of adjacent support pipes, and has short connecting pipes connecting the support pipes to each other,
The support pipe has a first base plate against which the end of the support pipe can abut, a second base plate having four through holes through which the support pipe can be inserted, and a stay member which is attached and fixed between the first and second base plates, arranges the first base plate and the second base plate in parallel, and guides the end of the support pipe inserted into the through holes so that it abuts against the first base plate, and is removably provided at both upper and lower ends of the support pipe.

In the support pipe fixing device according to the present invention, the stay member is composed of four plates fixed in an upright position between the first and second base plates so as to surround the four support pipes, and it is preferable that both ends of each plate are bent to follow the opposing sides of the outer circumferential surface of the adjacent support pipes with a gap.

In the support pipe fixing device according to the present invention, it is preferable that the first base plate, which can abut against the lower end of the support pipe, has a drain hole formed at a position corresponding to the inside of the support pipe when viewed in a plan view.

The support work and the supporting pipe fixing device used therein of the present invention have fixing devices that are removably attached to both upper and lower ends of the support pipe, so that the support pipe can be used to construct the support work and the support work can be configured to be disassembled.
In particular, the fixing device has a first base plate, a second base plate, and a stay member fixed between the first and second base plates, and the second base plate has four through holes through which the support pipes can be inserted, and the stay member guides the ends of the support pipes, so that the relative positional relationship between adjacent support pipes can be reliably maintained at the upper and lower ends of the support pipes with a simple structure. This allows for stable support of structures and support by jacks, etc.

FIG. 2 is a front view of a support according to an embodiment of the present invention. 1A and 1B are a plan view and a front view, respectively, of a fixing device for a support pipe installed at the lower end of the support. 13A and 13B are a plan view and a front view, respectively, of a support pipe fixing device installed at the upper end of the support.

Next, with reference to the attached drawings, an embodiment of the present invention will be described for understanding the present invention.
As shown in Figures 1, 2(A) and (B), 3(A) and (B), a support structure (square support) 10 according to one embodiment of the present invention has four support pipes 11 arranged in an upright state at each vertex of a virtual square (an example of a virtual right-angled quadrangle, which may be a virtual rectangle) when viewed in a plane, a plurality of connecting pipes 12 connecting portions (mid-way positions in the up-down direction) of the four support pipes 11 excluding both ends in the vertical direction (height direction), and fixing devices (support pipe fixing devices) 13 and 14 connecting the lower and upper ends (both ends) in the vertical direction of the four support pipes 11, respectively. The support structure is used, for example, at civil engineering or construction sites to support a structure (not shown) from below.
The following provides a detailed explanation.

The four support pipes 11, as shown in Fig. 1, are normally used for constructing scaffolding, and their standard lengths include 1800 mm, 2700 mm, 3800 mm, etc., but are not limited thereto. The four support pipes 11 used for constructing the shoring 10 have the same length (same configuration).
The four support pipes 11 are arranged at the vertices of a virtual square in plan view, but the interval between adjacent support pipes 11 (the axial distance between the support pipes 11: equivalent to the length of the sides of the virtual square) is set appropriately according to the configuration of the shoring 10, and is, for example, about 100 to 300 mm (here, 150 mm). When the four support pipes 11 are arranged at the vertices of a virtual rectangle in plan view, the interval can be changed, for example, within the range of the interval between adjacent support pipes described above.

The support pipe 11 has a pipe material 15 with a circular cross section, and on its outer circumference, excluding both ends in the vertical direction (length direction), a group of fasteners 20 consisting of first to fourth (four) fasteners 16-19 that are U-shaped (U-shaped in cross section (same shape)) in a plan view is provided at a predetermined pitch (for example, about 400 to 600 mm) in the vertical direction of the pipe material 15 (four locations in this case). The first to fourth fasteners 16-19 that make up the group of fasteners 20 are fixed at 0 degrees, 90 degrees, 180 degrees, and 270 degrees positions on the outer circumference of the pipe material 15 (front, back, left and right of the pipe material 15 with its axis vertically positioned), respectively. The first and third hanging fittings 16, 18 are positioned at the same height and facing each other with the pipe material 15 at the center, and the second and fourth hanging fittings 17, 19 are positioned at the same height and facing each other with the pipe material 15 at the center. Furthermore, the first and third hanging fittings 16, 18 are positioned lower than the second and fourth hanging fittings 17, 19 by approximately that height (they are installed at a different level).

The connecting pipe 12 is a short pipe having a horizontal pipe main body 21 and a square tube material 22 and a wedge material 23 provided at both ends of the horizontal pipe main body 21. The wedge materials 23 are attached to opposing first and third hanging fittings 16 and 18, respectively, provided at the same height position on adjacent support pipes 11, and also to opposing second and fourth hanging fittings 17 and 19, respectively, to connect the support pipes 11 to each other.
Specifically, the connecting pipe 12 and the support pipe 11 can be connected by fitting the wedge material 23 from above while the notches 24 formed in the square tube material 22 are fitted from the sides into the first to fourth hanging fittings 16 to 19, respectively.
The configuration of the square tube material 22 and the wedge material 23 is substantially the same as that disclosed in, for example, Japanese Patent No. 6251711, and therefore will be described briefly below.

The rectangular tube material 22 is made of steel (including stainless steel), has a regular square shape in plan view (i.e., a rectangle with rounded corners), and has side plate portions 25, 26 arranged at a distance equal to the width of the first fastening fitting 16 (or the second to fourth fastening fittings 17-19, the same applies below), and a front plate portion 27 and a rear plate portion 28 connecting the side plate portions 25, 26. A notch 24 is formed in the center of the front side of the front plate portion 27 and the side plate portions 25, 26, and the first fastening fitting 16 fits into this notch 24 with a small gap, and the front plate portion 27 and the upper parts of the side plate portions 25, 26 are placed on top of it.
A protrusion is formed on the front side of the square tubular material 22 (i.e., the front upper part of the notch 24) which partially fits into the upper part of the first hanging fitting 16, so that when the first hanging fitting 16 is inserted into the notch 24 of the square tubular material 22, the square tubular material 22 does not move laterally.

The wedge material 23 is made of steel (including stainless steel) and is fitted from above into the gap between the square tubular material 22 attached to the first fastening metal fitting 16 and the first fastening metal fitting 16, with a long through hole 29 provided in the center. The wedge material 23 is fitted into the square tubular material 22 with a gap, becomes thinner downward, and has a "L" shaped portion 30 with the lower part bent backward. The wedge material 23 is inserted through both the first fastening metal fitting 16 and the square tubular material 22, and descends downward to fasten the first fastening metal fitting 16 and the square tubular material 22 together.
The retaining metal fittings 31, which are provided across the upper part of the square tubular material 22 from front to back, are provided with a gap (loosely fitted) in the through holes 29 of the wedge material 23. This makes it possible to prevent the wedge material 23 from falling off the square tubular material 22, and also makes it possible to smoothly change the angle and position of the wedge material 23 from an uninserted state (inclined state or horizontal state) to an inserted state (vertical state: see Figure 1).

The pair of fixing devices 13, 14 are removably attached to the lower end and upper end of the support pipe 11 in the vertical direction, respectively, as shown in FIG.
The fixing device 13 provided at the lower end of the support pipe 11 is installed on the ground directly or via a jack (not shown) for adjusting the height of the support. The jack has a conventionally known structure having a base part installed on the ground, a threaded shaft extending upward from the base part, and a movable part screwed onto the threaded shaft, and the height of the movable part can be adjusted by rotating the movable part while it is screwed onto the threaded shaft.
The fixing device 14 provided at the upper end of the support pipe 11 supports the structure directly or via an auxiliary fitting (beam support fitting, etc.), and a jack (not shown) can also be installed.

The fixing device 13 provided at the lower end of the support pipe 11 has a first base plate 32, a second base plate 33, and a stay member 34 that is attached and fixed between the first and second base plates 32, 33 and arranges the first base plate 32 and the second base plate 33 in parallel, as shown in Figures 1, 2 (A) and (B).
The fixing device 14 provided at the upper end of the support pipe 11, as shown in Figures 1, 3 (A) and (B), has a first base plate 35, a second base plate 36, and a stay member 37 that is attached and fixed between the first and second base plates 35, 36 and positions the first base plate 35 and the second base plate 36 in parallel.
Since the two fixing devices 13, 14 have substantially the same configuration, the fixing device 13 at the lower end will be described in detail, and the fixing device 14 at the upper end will be described briefly.

As shown in Figures 2 (A) and (B), the first and second base plates 32, 33 of the fixing device 13 are square plate materials in a plan view made of steel (e.g., SS400). Their external shapes (outer contour shapes) are the same, but the first base plate 32 is thicker than the second base plate 33.
The first base plate 32 is capable of being abutted from above by the lower end (lower end) of the support pipe 11, and at a position corresponding to the inside of the support pipe 11 when viewed in a plane, a drainage hole 38 (through hole) is formed for discharging water that has flowed into the support pipe 11 to the outside.
The second base plate 33 has four through holes 39 (at the vertices of an imaginary square in plan view) through which the lower ends of the support pipes 11 can be inserted. The inner diameter of the through holes 39 is slightly larger than the outer diameter of the lower ends of the support pipes 11.

The first and second base plates 32, 33 are formed with holes 40 to 42 for mounting the above-mentioned jacks.
Of the holes 40, 41 formed in the first base plate 32, the hole 40 formed in the center of the first base plate 32 is for the upper side of the jack's screw shaft to pass through, and the multiple holes 41 formed on the outer periphery of the first base plate 32 are for fastening and fixing to the movable part of the jack with fastening members.
A hole 42 formed in the center of the second base plate 33 is for the upper side of the screw shaft of the jack to pass through.

The stay member 34 guides the lower ends of the support pipes 11 inserted into the through holes 39 of the second base plate 33 so as to abut against the first base plate 32. Specifically, the stay member 34 is composed of four plate materials 43 attached and fixed by, for example, welding in an upright state between the first and second base plates 32, 33 so as to surround the four support pipes 11.
Each plate 43 is made of steel (e.g., SS400) and is bent so as to be concave toward the center of the first and second base plates 32, 33 in plan view, and so that both ends of each plate 43 are bent with a gap between them and follow the opposing sides of the outer circumferential surfaces of the adjacent support pipes 11. The height of the plate 43 (the distance between the first base plate 32 and the second base plate 33) is, for example, about 80 to 150 mm (120 mm in this example) in order to reliably fix and support the support pipes 11.

At the ends of adjacent plate materials 43, at positions facing each other with respect to the support pipe 11, one or more pairs of holes 44 for anti-pullout pins are formed.
Since the fixing device 13 is attached to the four support pipes 11 only by inserting the lower ends of the support pipes 11 into the second base plate 33, there is a risk that the support pipes 11 may come off from the fixing device 13. For this reason, a plurality of holes 44 for the retention pins are formed at the end of the plate material 43 so that the positions of the above-mentioned holes 44 for the retention pins match the positions of holes (not shown) previously provided at the lower ends of the support pipes 11. In use, the retention pins (not shown) are inserted through the successive holes 44 for the retention pins and the holes in the support pipes 11 to prevent the support pipes 11 from coming off from the fixing device 13.

As shown in Figures 3(A) and (B) , the first and second base plates 35, 36 of the fixing device 14 are square plate materials in a plan view (similar to the first and second base plates 32, 33) and have the same outer shape (outer contour shape) and thickness, but may be different.
The first base plate 35 is capable of being abutted against the upper end (top) of the support pipe 11 from below, and the second base plate 36 is provided with four through holes 45 (at the vertices of an imaginary square in plan view) through which the upper ends of the support pipes 11 can be inserted. The inner diameter of the through holes 45 is slightly larger than the outer diameter of the upper ends of the support pipes 11.
The first and second base plates 35, 36 are formed with holes 46-48 for mounting the above-mentioned auxiliary fittings, jacks, etc.

The stay member 37 guides the upper end of the support pipe 11 inserted into the through hole 45 of the second base plate 36 so as to abut against the first base plate 35. Specifically, the stay member 37 is composed of four plate materials 49 attached and fixed in an upright state between the first and second base plates 35, 36 so as to surround the four support pipes 11 (similar to the stave material 34 and the plate materials 43 constituting the stave material 34).
Each plate material 49 is bent so as to be concave toward the center of the first and second base plates 35, 36 in plan view, and so that both ends of each plate material 49 are bent with a gap between them along the opposing sides of the outer circumferential surfaces of the adjacent support pipes 11. The height of the plate material 49 (the distance between the first base plate 35 and the second base plate 36) is set to, for example, about 130 to 200 mm (170 mm in this example) in order to reliably fix the support pipe 11.
At the ends of the adjacent plate materials 49, at positions facing each other with respect to the support pipe 11, one or more pairs of anti-pullout pin holes 50 (similar to the anti-pullout pin holes 44) are formed.

The construction (assembly) of the support 10 described above involves, for example, placing the four support pipes 11 prepared in advance in a horizontal position (lying down), and attaching the fixing devices 13, 14 to the lower and upper ends of the support pipes 11. After arranging each support pipe 11 so that the first and third hanging fittings 16 and 18, which are provided at the same height position of adjacent support pipes 11, face each other, and the second and fourth hanging fittings 17 and 19 face each other, the retaining pins are inserted into the retaining pin holes 44, 50 of the stay members 34, 37, and the fixing devices 13, 14 are attached and fixed to each support pipe 11.
If necessary, a jack may be attached to the fixing device 13, and an auxiliary bracket or a jack may be attached to the fixing device 14.
Then, the wedge members 23 of the connecting pipe 12 are attached to the first to fourth hook fittings 16 to 19, respectively, to connect the support pipes 11 to each other.
The support 10 assembled in the above manner is placed in an upright position for use.

The dismantling of the support 10 is carried out in the reverse order to that described above.
Specifically, after the upright support 10 is set to a horizontal position, the wedge material 23 of the connecting pipe 12 that connects the support pipes 11 together is removed from the first to fourth hanging fittings 16 to 19.
Next, the retaining pins inserted into the retaining pin holes 44, 50 of the stay members 34, 37 of the fixing devices 13, 14 are pulled out, and the fixing devices 13, 14 are removed from the respective support pipes 11.
The construction and dismantling of the support 10 is not limited to the method described above, but can be modified in various ways.
In this way, by using the support structure 10 of the present invention and the support pipe fixing devices 13, 14 used therein, the support pipe 11 can be used to construct the support structure 10, and the support structure 10 can be made disassembled, allowing for stable support of structures and support by jacks, etc.

It is also possible to prepare four sets of supports (square supports) and arrange each support in an upright position at each vertex of a virtual square (virtual right-angled rectangle) when viewed in a plan view, and connect the opposing support pipes of adjacent supports with a long connecting pipe (a connecting pipe whose horizontal pipe body is longer than the short connecting pipe 12 described above).
Each support structure can be constructed by connecting multiple support pipes in the axial direction. In this case, they can be constructed in the following manner.
First, four jacks (not shown) are placed at the vertices of an imaginary square on the ground in a plan view.
Next, a fixing device is attached to the lower end of the support pipe on each jack using a bolt.

The support pipes are inserted through the through holes located at the innermost position of each fixing device (at the vertices of the smallest imaginary square formed in a planar view by the through holes of the four fixing devices), and wedge materials provided at both ends of the long connecting pipe are attached to opposing hanging fittings provided at the same height position (e.g., the top and bottom) of adjacent support pipes in the upright state, thereby connecting the support pipes to each other.
Next, the support pipes are inserted into two of the through holes except for the through holes located on the outermost sides of each fixing device (the vertices of the largest imaginary square in a planar view formed by the through holes of the four fixing devices), and the wedge material of the long connecting pipe is attached to opposing hanging fittings provided at the same height position on adjacent support pipes in the upright state to connect the support pipes and install the leading handrails (four structural surfaces).

Finally, the support pipes are inserted through the through holes located on the outermost sides of each fixing device, and short connecting pipes (i.e., connecting pipes 12) are attached to the opposing hooks provided at the same height of the adjacent support pipes in the upright state of each fixing device, thereby connecting the support pipes together. At this time, each support pipe is fixed to the fixing device using the aforementioned anti-pullout pin.
In addition, a step (a floor-attached cloth frame) is hung between the long connecting pipes that are attached to the opposing hooks provided midway along the height of the first-level support pipes and positioned on the opposing sides of the inner imaginary square in plan view. This step serves as a foothold for installing the second-level support pipes, which will be described later.
Using the above method, the installation of the support pipes for the first vertical layer is completed.

Next, the handrail advance construction method is used to install the support pipes for the second vertical layer.
First, the second layer support pipes are connected to the two support pipes attached to each fixing device, excluding the innermost and outermost support pipes, and then a leading handrail is installed and the support pipes are connected to each other using a long connecting pipe (similar to the first layer support pipes).
Next, the second level support pipes are connected to the remaining support pipes, the innermost support pipes are connected to each other using long connecting pipes, the treads are spanned, and a staircase is installed to span the treads of the first and second levels.
Finally, the support pipes at positions other than the innermost and outermost positions are connected together using long connecting pipes, and the support pipes of each fixing device are connected together using short connecting pipes.
Using the above method, the installation of the second vertical layer of support pipes is completed.

From the third vertical layer onwards, the support pipes are installed using the same procedure as for the second layer described above.
After the installation of the final layer of support pipes is completed, a fixing device is attached to the upper end of the final layer of support pipes, and the fixing device is fixed to each support pipe using the above-mentioned retaining pin. If necessary, the above-mentioned auxiliary metal fittings etc. are attached to this fixing device.

Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the configurations described in the above embodiments, and includes other embodiments and modifications that are conceivable within the scope of the matters described in the claims. For example, the scope of the present invention also includes a case in which the support of the present invention and the fixing device for the support pipe used therein are configured by combining part or all of the above-mentioned respective embodiments and modifications.
In the above embodiment, the first and third hanging fittings provided on the pipe material of the support pipe are described as being positioned (installed at a step) lower than the second and fourth hanging fittings by approximately the same height, but the first to fourth hanging fittings may also be positioned at the same height.
In addition, in the above embodiment, a connecting pipe for connecting the support pipes is used that has a short horizontal pipe body and a square tube material and a wedge material provided at both ends of the horizontal pipe body. However, as long as it is possible to connect the support pipes to each other, there is no particular limitation, and for example, a conventionally known pipe having wedge materials provided at both ends of the horizontal pipe body can be used.

Furthermore, the support pipes used in the fixing device can be the same products as the support pipes used in normal scaffolding, so various connection methods and configurations not limited to the above embodiment are possible, and the support pipes can be used in various ways. Also, by using the support pipes in this way, it becomes easy to construct, for example, work scaffolding and lifting equipment.
In the above embodiment, four support pipes are connected with a connecting pipe and fixing devices are attached to both ends of the support pipes, which is described as being used as a support structure. However, the method of use is not particularly limited, and any configuration that combines some or all of the above embodiments and variations is within the scope of the present invention.

10: Support, 11: Support pipe, 12: Connecting pipe, 13, 14: Fixing device (fixing device for support pipe), 15: Pipe material, 16: First fastening fitting, 17: Second fastening fitting, 18: Third fastening fitting, 19: Fourth fastening fitting, 20: Fastening fitting group, 21: Horizontal pipe body, 22: Square tube material, 23: Wedge material, 24: Notch, 25, 26: Side plate portion, 27: Front plate portion, 28: Rear plate portion, 29 : Through hole, 30: "L" shaped portion, 31: Retaining metal fitting, 32: First base plate, 33: Second base plate, 34: Stay member, 35: First base plate, 36: Second base plate, 37: Stay member, 38: Water drain hole, 39: Through hole, 40-42: Hole, 43: Plate material, 44: Hole for retaining pin, 45: Through hole, 46-48: Hole, 49: Plate material, 50: Hole for retaining pin

Claims (6)

four support pipes each having a group of four U-shaped fasteners in a plan view, the group being arranged in an upright state at each vertex of an imaginary right-angled rectangle in a plan view, the group being provided at 0 degree, 90 degree, 180 degree, and 270 degree positions on the circumference of a pipe material having a circular cross section, at a predetermined pitch in the up-down direction of the pipe material;
In a support structure that supports a structure from below, a wedge member provided at both ends of a horizontal pipe body is attached to the opposing fasteners provided at the same height position of adjacent support pipes, and a short connecting pipe is provided to connect the support pipes to each other,
A pair of fixing devices are removably attached to both ends of the support pipe in the vertical direction,
Each of the fixing devices is a support structure characterized in that it comprises a first base plate against which the upper and lower ends of the support pipe can abut, a second base plate having four through holes through which the support pipe can be inserted, and a stay member that is attached and fixed between the first and second base plates, arranges the first base plate and the second base plate in parallel, and guides the end of the support pipe inserted into the through hole so that it abuts against the first base plate. In the support structure described in claim 1, the stay member is composed of four plates fixed in an upright position between the first and second base plates so as to surround the four support pipes, and both ends of each plate are bent to follow the opposing sides of the outer periphery of the adjacent support pipes with a gap. The support structure according to claim 1 or 2, characterized in that the first base plate of the fixing device provided at the lower end of the support pipe has a drain hole formed at a position corresponding to the inside of the support pipe in a plan view. four support pipes each having a group of four U-shaped fasteners in a plan view, the group being arranged in an upright state at each vertex of an imaginary right-angled rectangle in a plan view, the group being provided at 0 degree, 90 degree, 180 degree, and 270 degree positions on the circumference of a pipe material having a circular cross section, at a predetermined pitch in the up-down direction of the pipe material;
A support pipe fixing device for use in support work for supporting a structure from below, which has wedges provided at both ends of a horizontal pipe body attached to opposing fasteners provided at the same height position of adjacent support pipes, and has short connecting pipes connecting the support pipes to each other,
A supporting pipe fixing device comprising: a first base plate against which the end of the supporting pipe can abut; a second base plate having four through holes through which the supporting pipe can be inserted; and a stay member which is attached and fixed between the first and second base plates, arranges the first base plate and the second base plate in parallel, and guides the end of the supporting pipe inserted into the through holes so that it abuts against the first base plate, and is removably provided at both upper and lower ends of the supporting pipe. In the support pipe fixing device according to claim 4, the stay member is composed of four plates fixed in an upright state between the first and second base plates so as to surround the four support pipes, and both ends of each plate are bent to follow the opposing sides of the outer circumferential surface of the adjacent support pipes with a gap. The support pipe fixing device according to claim 4 or 5, characterized in that the first base plate that can abut against the lower end of the support pipe has a drain hole formed at a position corresponding to the inside of the support pipe in a plan view.

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