JPS6344887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device used in an extrusion construction method for concrete bridge girders.

Conventionally, in the extrusion construction method of concrete bridge girders using a bearing device, as shown in Fig. 1, a bridge girder G is loaded onto a bearing device S placed on a pier B, and the bearing device S is kept constant by an extrusion device E. Push out the bridge girder G by pushing the distance, in this state, lift the bridge girder G with the vertical jack F, return the support device S to its original position, load the bridge girder G onto the support device S again, and repeat the pushing operation. As shown in FIG. It can be roughly divided into construction methods in which the bridge girder G is loaded and pulled (or pushed) by an extrusion device E, so that it slides on the support device S together with the movable member T, and is successively extruded and constructed.

The present invention is particularly intended to improve the problems of conventional bearing devices used in the latter construction method.

That is, in this construction method, if the bridge girder G pushed out in the bridge axis direction moves (displaces) in the direction perpendicular to the bridge axis during extrusion, an unbalanced load acts on the support device S that supports the bridge girder G, and the support device The upper shoe of S and the movable member tilt, and this tilting acts on the bridge girder G, and there is a risk that the bridge girder G will be damaged by the bending, so moving in that direction is often a complicated task. Issues remained that required regulation and coordination.

To be more specific, the bridge girders used in the extrusion construction method are made of prestressed concrete and have a box-shaped cross section, as shown in Figure 3.
The hollow part K between the lower slab I and the upper slab J is also filled with concrete in the part where it is attached to the bridge girder, and the strength is increased to sufficiently withstand the concentrated load after and during extrusion construction. The other part, that is, the part located between the spans (between the piers), is formed into a box shape with a hollow part K in consideration of manufacturing and economic efficiency, so the lower slab I of the bridge girder G is constructed by extrusion due to its structure. It is difficult to withstand the concentrated load of the bridge girder G during extrusion construction.
is limited to web H.

Therefore, in the extrusion construction method of the bridge girder G, as shown in FIG. A temporary support member A supporting the web H and a movable member T are arranged on the upper shoe C with their centers eccentric to the side edge side from the center of the support device S, and the bridge girder G is placed on the side edge of the support device S. The structure is such that it is supported by the section.

However, in this configuration, if the bridge girder G is normally pushed out on the support device S that supports the bridge girder G at the side edge, in other words, while maintaining equilibrium on the support device S, and being pushed straight out in the bridge axis direction, there will be a problem. does not occur, but
As shown in FIG. 5, there is an imbalance in the pulling force (or pushing force) in the extrusion device that pulls out (or pushes out) the bridge girder G, or the movable member D of the support device S is lowered to support the bridge girder G at the side edge. When the bridge girder G moves (displaces) in either direction perpendicular to the bridge axis and supports the vicinity of the lower slab I of the bridge girder G due to the inclination of the upper shoe C due to slight tilting between the shoe L and the upper shoe C. , the load of the bridge girder G on the supporting device S in the direction of movement increases from the normal state in which the supporting device S supports the bridge girder G in equilibrium at a position eccentric from its center (arrow A in the figure), and the bearing Since an unbalanced load acts on the device S, the movable member D tilts in the direction of arrow B in the figure with the lower shoe L as a fulcrum along with the upper shoe C and temporary support member A, and this tilting causes the lower slab I of the bridge girder G to A bending force due to the own weight of the bridge girder G acts, and there is a concern that this force may damage the lower slab I of the bridge girder G, which is not considered against local concentrated loads.

Therefore, the problem remains that the movement of the bridge girder G in the direction perpendicular to the bridge axis must be regulated and adjusted by frequently performing complicated operations.

In this case, since the load on the bridge girder G is reduced in one of the opposing supporting devices S, phenomena such as inclination are less likely to occur.

The present invention has been made in view of the above, and when a bridge girder is extruded and erected, the support device is moved below the web of the bridge girder so that the support device supports the entire load of the bridge girder, and after the erection, the support device is moved under the web of the bridge girder. A bearing device configured to be returned to position is obtained.

That is, a generally flat sole plate is fixed to the bridge girder so that its lower surface is flush with the lower surface of the bridge girder, and a bed plate is fixed to the bridge pier, and a sole plate is mounted on the upper surface of the bed plate. When the bridge girder is being erected, the lower shoe, the movable member, and the upper shoe can be temporarily fixed to each other while the support body is moved to support the web in the direction perpendicular to the bridge axis of the bridge girder. and a fixing hole that moves inward to support the normal position of the bridge girder in the direction perpendicular to the bridge axis after erection, and enables mutual fixation while engaging with the sole plate fixed to the bridge girder. The object of the present invention is to provide a support device for an extrusion construction method, which is characterized in that it is formed by forming the support device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In this embodiment, the supporting devices arranged on the bridge piers are arranged symmetrically across the bridge axis in a direction perpendicular to the bridge axis, so only one of them will be illustrated and explained.

Reference numeral 1 denotes a flat bed plate constituting a support device fixed to the pier B, and the bed plate 1 is provided with fixing holes 2, 2 passing through its wall thickness and engaging holes 3, 3 having threaded portions. It is being

Reference numerals 4 and 4 denote sleeves that are integrally fixed to the lower surface of the bed plate 1 with their axes aligned with the fixing holes 2 and 2, and the sleeves 4 and 4 have threaded portions formed on their inner surfaces.

Reference numerals 5 and 5 designate anchor bolts screwed into the sleeves 4 and 4 with threaded portions remaining on the fixing holes 2 and 2 side.

Reference numeral 6 denotes a support body comprising a lower shoe 7 constituting a support device placed on the bed plate 1, a movable member 8 disposed on the lower shoe 7, and an upper shoe 9 disposed on the movable member 8. It is.

The lower shoe 7 has a concave portion 10 on its upper surface in which the bearing plate constituting the movable member 8 slides, and convex portions 11, 11 and through holes 12, 12 that face each other across the concave portion 10 at both ends in the direction perpendicular to the bridge axis. is provided.

Note that the through holes 12, 12 match both the fixing holes 2, 2 of the bed plate after erection, and the engagement holes 3, 3 of the bed plate during erection.

Further, the upper shoe 9 has a concave portion 14 along the direction perpendicular to the bridge axis on its upper surface 13, and locking holes 15, 15 for engaging the sole plate at both ends in the direction of the bridge axis, and also has holes 15, 15 at both ends in the direction perpendicular to the bridge axis. Stepped portions 17, 17 having cutout portions 16, 16 that engage with convex portions 11, 11 of the lower shoe
is formed.

In addition, in the case of a support device that releases the expansion and contraction and tilting of the bridge girder G after construction, the notches 16, 16 have a size equal to the width of the convex portion 11 of the lower shoe plus the above-mentioned expansion and contraction allowance and assembly allowance. A support device that restricts expansion and contraction and releases only inclination is designed to have a size that includes an assembly allowance.

18, 18 are temporary fixing bolts, and the temporary fixing bolt 1
8 and 18 are the through holes 12 and 18 of the lower shoe when constructing the bridge girder G,
12 into the engagement holes 3, 3 of the bed plate.
It is screwed on to temporarily fix the lower shoe 7 to the bed plate 1.

19 is a sole plate that constitutes a supporting device;
The sole plate 19 has a downward recess 21 in the center of its lower surface 20, screw holes 22, 22 around the downward recess 21 for fixing the connecting member, and upper shoe locking holes at both ends in the bridge axis direction. Bolt holes 23, 23 that match the holes 15, 15 are formed.

The sole plate 19 is buried and fixed at a position that matches the support body 6 placed on the pier B after the bridge girder G is manufactured, with its lower surface 20 flush with the lower surface of the bridge girder G. .

Reference numeral 24 denotes a connecting member constituting a support device, and the connecting member 24 has a projection 26 at the center of its upper surface 25 that engages with the downward recess 21 of the sole plate, and bolt holes of the sole plate at both ends in the bridge axis direction. 23, 23 and through holes 27, 27 that match the locking holes 15, 15 of the upper shoe, and around the protrusion 26, engagement holes 28, 28 that match the screw holes 22, 22 of the sole plate are formed. has been done.

The connecting member 24 also has a concave part 30 on its lower surface 29 that matches the concave part 14 of the upper shoe, and a concave part 30 on both ends of the concave part 30 in the direction perpendicular to the bridge axis, and in the direction perpendicular to the bridge axis of the upper shoe 4. Convex strips 31, 31 that fit into the side surfaces of
is formed to protrude from the lower surface 29.

32 is a temporary support member, and the temporary support member 32 is attached to the leg portion 3.
3, 33 is formed in a U-shape in cross section, and a recess 35 into which a sliding member 34 is fitted is provided on the surface facing away from the legs 33, 33.

The temporary support member 32 has its leg portions 33, 33
is fitted onto the side surface of the upper shoe 9 in the direction perpendicular to the bridge axis, and is fixed to the upper shoe 9 with bolts.

36 is a long moving member made of thin steel plate, etc.
The movable member 36 is supported by being rolled around a holding device 37 so as to be movable in the bridge axis direction on the temporary support member 32, and is wound up by a winding device 38 after passing over the temporary support member 32. be.

The holding device 37 and the winding device 38 have their base portions fixed to the pier B by bolts or the like at the front and rear of the support body 6 in the bridge axis direction, respectively.

Reference numerals 39 and 39 designate side blocks that are fixed to the convex portions 11, 11 of the lower shoe with bolts or the like, and lock the step portions 17, 17 of the upper shoe in the vertical direction.

40, 40 are locking pieces arranged between the notches 16, 16 of the upper shoe and the protrusions 11, 11 of the lower shoe, and the locking pieces 40, 40 are arranged in the direction of the bridge axis of the upper shoe 9 during construction. It regulates movement.

8 and 9, 41 indicates the concave strip 14 of the upper shoe and the concave strip 3 of the connecting member after the bridge girder G is constructed.
A locking member 42, 42 is a fixing bolt having a nut 43, 43, and the fixing bolt 42, 42 is a locking member that is fitted into the upper shoe 9 and the connecting member 24 to prevent displacement in the bridge axis direction. After installing G, the through holes 12, 12 of the lower shoe and the fixing holes 2,
2 and the sleeve 4 of the bed plate.
4, and the lower shoe 7 is fixed to the bed plate 1 by screwing nuts 43, 43 together.

Next, the extrusion construction of the bridge girder G will be explained in detail.

That is, the support body 6, on which the temporary support member 32 is placed on the bed plate 1 fixed on the pier B, is attached to the web H of the bridge girder G in the direction perpendicular to the bridge axis.
The temporary fixing bolts 1 are moved from their normal positions to support them, and in this state, the temporary fixing bolts 1 are inserted into the engagement holes 3, 3 of the bed plate and the through holes 12, 12 of the lower shoe.
8 and 18 to temporarily fix the support body 6 to the bed plate 1 by fixing the lower shoe 7 to the bed plate 1.

After that, a holding device 37 for supplying the movable member 36 and a winding device 38 are placed and fixed on the front and rear sides of the support body 6 in the bridge axis direction, and the sliding member 34 of the temporary support member is fixed. Upward moving member 36
Then, on the movable member 36, a bridge girder G manufactured on a manufacturing table provided behind the abutment and attached with a hand-stretched garter is loaded.

Then, using a push-out device that attaches the bridge girder G to either the pier B or the bridge girder G, the top of the support body 6 is moved by sliding contact between the sliding member 34 fitted to the temporary support member 32 and the movable member 36. Concrete is poured onto the bridge girder G that has been pushed out together with the movable member 36 and pushed forward on the empty production table until the sole plate 19 fixed to the bridge girder G matches the predetermined support body 6. Push out.

Next, at this position, the bridge girder G is raised using a vertical jack or the like so as to form a gap between the support body 6 and the bridge girder G, and in this state, the lower shoe 7 is fixed to the bed plate 1 by the temporary fixing bolts. 18, 18 to release the temporary fixation of the support body 6, and
Return it to the normal position in the direction perpendicular to the bridge axis where it matches the sole plate 19 fixed to the bridge girder G, and at the normal position insert the fixing bolts 42, 42
and insert the sleeves 4, 4 of the bed plate.
Then, by fixing the lower shoe 7 to the bed plate 1 with nuts 43, 43, the support body 6 is permanently fixed and held on the support body 6 until the support body 6 is moved. The moving member 36 supplied from the device 37 is also separated from the holding device 37 leaving only the necessary length, and the moving member 3
6 to the position of the support body 6 which has been moved to the normal position together with the winding device 38 that winds up the support body 6.
Place it on the support body 6 again.

Next, the bridge girder G is lowered onto the movable member 36 disposed on the support body 6, the bolts fixing the temporary support member 32 to the upper shoe 9 are removed, and the connecting member 24 is attached to the sole plate 19. The protrusion 26 provided on the upper surface 25 of the sole plate is fitted into the downward recess 21 of the sole plate so that the protrusions 31, 31 of the connecting member engage with the side surface of the upper shoe 9 in the direction perpendicular to the bridge axis. The connecting member 24 fixed to the sole plate 19 is screwed into the screw holes 22, 22 of the sole plate to fix them together, and then pushed out again by the pushing device. By pressing the temporary support member 32 on the upper shoe 9, the temporary support member 32 and the moving member 36 on the temporary support member 32 are replaced with the connection member 24.

After that, a locking member 41 is arranged between the grooved portion 30 of the connecting member that matches the grooved portion 14 of the upper shoe, and is inserted into the locking holes 15, 15 of the upper shoe and the through holes 27, 27 of the connecting member. The supporting device is constructed by screwing the bolts into the bolt holes 23, 23 of the sole plate and fixing the upper shoe 9 to the sole plate 19 via the connecting member 24.

Then, the locking pieces 40, 40 that restricted the movement of the upper shoe 9 in the bridge axis direction during construction, the pushing device, the holding device 37 that supplied the moving member 36, and the winding device 38 that took up the moving member 36 were removed. By doing so, the erection is completed.

By configuring the support device in this way, even if the bridge girder G moves in the direction perpendicular to the bridge axis during extrusion construction, the web H of the bridge girder G is supported by the entire surface of the support body 6, so that the web H of the bridge girder G is supported by the entire surface of the support body 6. It is possible to suppress the occurrence of an uneven load that would cause the shoe 9 and the movable member 8 to tilt, and to prevent damage to the bridge girder G, as well as to reduce complicated movement restrictions and frequent position adjustment work.

Furthermore, the temporary support member 32 can be easily removed by replacing it with the connecting member 24 during extrusion construction.

In addition, if the movement of the bridge girder G in the direction perpendicular to the bridge axis exceeds a certain amount to the extent that it interferes with the extrusion operation, adjustment work is performed to return the bridge girder G to its normal position.

In addition, in this embodiment, the temporary support member 32 and the connection member 2
4, the extrusion of the bridge girder G does not damage the sliding member 34 of the temporary support member 32 until the connecting member 24 contacts and presses the temporary support member 32, and the temporary support member 32 and the moving member The moving member 36 is held in place by the holding device 3 so as to be carried out by sliding the moving member 36.
7 shows a mode in which the support body 6 is cut off leaving only the necessary length and moved to the normal position of the support body 6 together with the winding device 38. Since the receiving member 32 and the connecting member 24 are close to each other, the bridge girder G is directly connected to the sliding member 34 of the temporary supporting member until the moving member 36 is removed and the connecting member 24 contacts and presses the temporary supporting member 32. It is also possible to adopt a mode in which the temporary receiving member 32 and the connecting member 24 are replaced by sliding.

The present invention has the above-mentioned configuration, and can support the web of the bridge girder at the time of erection of the bridge girder and at a predetermined position after the erection to prevent damage to the bridge girder, and thus has a great effect of improving the efficiency of the erection work. It is.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the extrusion construction method using a conventional bearing device, Figures 3 to 5 are explanatory diagrams of the extrusion state of a bridge girder using a conventional bearing device, and Figure 6 7 is a partially vertical front view of the bearing device of the present invention during extrusion of the bridge girder, and FIG.
FIG. 8 is a partially longitudinal side view of the bearing device of the present invention during extrusion of a bridge girder, FIG. 8 is a partially longitudinal side view of the supporting device of the present invention after construction, and FIG. 9 is a partially longitudinal front view thereof. . 1: bed plate, 2: fixed hole, 3: engagement hole, 6: support body, 7: lower shoe, 8: movable member,
9: Upper shoe, 19: Sole plate.

Claims (1)

[Claims] 1. In a support device for a construction method in which a bridge girder is fixed to a pier and has a movable member between the upper and lower shoes, the bridge girder is sequentially extruded via a movable member on a support device, and the bridge girder has a roughly flat sole plate whose lower surface is attached to the bridge girder. A bed plate is fixed to the pier, and a lower shoe placed on the upper surface of the bed plate, a movable member, and an upper shoe are sequentially arranged from below. An engagement hole that allows the supported bodies to be temporarily fixed to each other when the bearing bodies are moved to support the webs in the direction perpendicular to the bridge axis of the bridge girder when the bridge girder is being erected; 1. A support device for an extrusion construction method, characterized in that a fixing hole is formed that moves inward to support the bridge girder and is engaged with a sole plate fixed to the bridge girder so that they can be fixed to each other.