JPH0684607B2 - Method of joining members - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to a method for joining members such as precast concrete floor slabs to foundation members such as bridge girders.

2. Description of the Related Art FIG. 7 is an enlarged cross-sectional view of a part of a typical prior art base member 1 and a member in a joined state. A steel girder 1 as a base member such as a main girder of a bridge is welded with a stud 3 as a first joining member, and above the stud 3,
A precast concrete floor slab (abbreviated as PC floor slab) 2, which is a member, is arranged at a distance from the upper flange 4 of the steel girder 1. The PC floor slab 2 is formed with an insertion hole 5 that widens toward the upper side, and a longitudinal rod-shaped stud 6 as a second joining member is welded to the stud 3 from above through the insertion hole 5. Are joined by. After that, the molds 8 and 9 are attached from both sides of the upper flange 4 of the steel girder 1 in the width direction (left and right direction in FIG. 7) to the lower surface 7 of the PC floor slab 2, and the filler 10 such as non-shrink cement mortar is filled. To be done. The steel girder 1 and the PC floor slab 2 are joined by hardening the filling material 10 thus filled.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned prior art, since the stud 3 is planted on the upper flange 4 of the steel girder 1 by welding, as shown in FIG. In the vicinity 12 of the base end portion 11, the contraction strain occurs due to the influence of heat accompanying welding. Occurrence of such shrinkage strain is shown in Fig. 8 (2).
As shown in Fig. 8, the studs 3 increase as they are planted from both sides in the longitudinal direction of the steel girder 1, and all the studs 3 are planted in the steel girder 1 as shown in Fig. 8 (3). After the completion, a large shrinkage strain occurs in the upper flange 4 and the steel girder 1
I will bend.

If the entire steel girder 1 is bent in this way, it is extremely difficult to assemble it on site. Moreover, all the studs 3 must be welded to the steel girder 1, which requires equipment such as a generator for welding, resulting in high cost. Moreover, since many studs 3 must be attached to the steel girder 1 by welding, a relatively long time is required, and a long construction period is required.

Therefore, an object of the present invention is to solve the above-mentioned technical problems, prevent the occurrence of shrinkage strain due to welding, and a member joining method capable of joining members on a base member quickly and at low cost. Is to provide.

Means for Solving the Problems The present invention is to implant a first joining member in a base member, arrange a member having an insertion hole formed in the thickness direction on the base member, and connect the member and the base member. A space including the first joint member is formed between the second joint member and a rod-shaped second joint member extending from the space over the insertion hole is inserted from the insertion hole while avoiding the first joint member. A method for joining members, characterized in that the member and the base member are joined together by filling and hardening the filler.

Operation According to the present invention, the first joint member is implanted in the base member by, for example, welding, and the member is arranged on the first joint member with a space. An insertion hole that is inserted in the thickness direction is formed in this member, and the second joining member is inserted from this insertion hole. In this state, a fluid filler is filled in the space and the insertion hole, and the filler is cured to join the member and the base member. Therefore, the base member and the filling material in the space are joined by the first joining member, and the filling material and the member in the space are joined by the second joining member, whereby the foundation member is joined. The number of first joining members directly implanted can be reduced, and the number of welded portions can be reduced. As a result, it is possible to reduce the contraction strain generated in the base member due to the heat of welding, and it is possible to reduce the deflection of the base member due to this strain.

Embodiment FIG. 1 is an enlarged sectional view of a part of an embodiment of the present invention. For example, in a main girder used for a bridge, a steel girder 20 having an I-shaped or H-shaped cross-section at right angles is supported between fulcrums, and a stud 22 that is a first joint member is welded to an upper flange 21 of the steel girder 20. Planted by. A precast concrete floor slab (hereinafter abbreviated as PC floor slab) 23, which is a member, is arranged on the upper flange 21 at a distance d. The PC floor slab 23 is mounted on the steel girder 20 by a spacer (not shown) made of, for example, concrete, metal, or wood interposed between the spaces d.

The PC floor slab 23 has a plurality of insertion holes 24 that are inserted in the thickness direction.
And a stud 25 as a second joining member is inserted into the insertion hole 24. For these studs 22 and 25, for example, reinforcing bars or steel rods are used. Then the upper flange 21
Of the upper flange 21 and the lower surface 29 of the PC floor 23 by means of metal molds 26, 27 fixed by, for example, welding at both ends in the width direction of FIG. Is formed. In this space 30, the stud 22
Is included. Filling material 31 is filled into the space 30 and the insertion hole 24 from the upper opening of the insertion hole 24.

FIG. 2 is an enlarged sectional view of a part cut in the bridge axis direction. A plurality of the studs 22 (three in this embodiment) are planted in the bridge axis direction, that is, in the lateral direction of FIG. A plurality of lines (4 in this embodiment) are arranged in the direction perpendicular to the bridge axis with a space L2 therebetween. The distance L2 between the studs 25 is selected to be equal to the distance L1 between the studs 22, for example. Further, the insertion hole 24 is provided with a stud 22 that is planted on the upper flange 21.
Are provided at positions away from each other, that is, at positions displaced in the bridge axis direction and the direction perpendicular to the bridge axis as described above, and have spaces S1 and S2 in the space 30. By providing such gaps S1, S2, when the filling material 31 is filled in the space 30, no void is generated in the filling material 31,
The studs 22 and 25 and the filling material 31 can be sufficiently fixed.

Further, the insertion hole 24 is formed in a conical shape, which also makes it possible to fill the filling material easily and smoothly from above without generating a gap when filling the filling material 31.

FIG. 3 is a plan view showing a state in which the PC floor slab 23 is mounted on the steel girder 20, and FIG. 4 is a partial perspective view showing the joint state between the steel girder 20 and the PC floor slab 23 by cutting out. Is. Steel girders 20 are spaced from each other
It is arranged parallel to the bridge axis direction with L3 open, and each steel girder 20
As described above, the PC floor slab 23 is arranged above the space 30 with a space 30 therebetween. In each PC floor slab 23, a plurality of insertion holes 24 are formed at positions corresponding to the intervals L3 between the steel girders 20. When filling the filler 31 into these insertion holes 24, on the PC floor slab 23 arranged at the laying position on the steel girder 20, the fluid filler 31 that has been pressure-fed from a conduit such as a hose. Can be filled into the insertion hole 24, and the filling operation can be performed quickly and easily. Further, the stud 22 is welded to the steel girder 20 in a factory or the like, and therefore it is not necessary to perform welding work on site. This makes it possible to reduce the welding work on site and to quickly perform the laying work on site.

The length l1 of the stud 22 can be made shorter than in the conventional case, and when the PC floor slab 23 is moved on the steel girder 20 for construction, the PC floor slab is placed at a higher position than the steel girder 20. It is not necessary to support 23, and the moving work can be performed at a position immediately above the steel girder 20 and in the vicinity thereof. The length l2 of the other stud 25
Can be a length from the upper surface 28 of the upper flange 21 to the vicinity of the upper surface 32 of the P floor slab 23, and a sufficient fixing length can be obtained.

FIG. 5 is a flow chart for explaining the procedure for joining the PC floor slab 23 to the base member 20, and FIG. 6 is a steel girder 20 and PC floor slab.
FIG. 23 is a simplified cross-sectional view showing a joined state with 23. First, the work is started in step s1, and the steel girder is operated in the factory in step s2.
A stud 22 is fixed to 20 by welding as shown in FIG. 6 (1). In step s3, as shown in FIG. 6 (2), the molds 26 and 27 are detachably fixed to the upper flange 21 of the steel girder 20 on both sides in the width direction using bolts and nuts, and then in step s4. The sixth PC floor slab 23 is placed on the formwork 26, 27.
It is arranged as shown in FIG. Such a work of loading the PC floor slab 23 to the laying position is performed by, for example, PC on the steel girder 20.
The floor slab 23 is placed on the steel girder 20 and moved. In this way, in the state where the PC floor slab 23 is arranged on the steel girder 20, the space 30 including the stud 22 is formed, and in this space 30
The insertion holes 24 formed in the PC floor slab 23 communicate with each other. When the PC floor slab 23 is placed on the steel girder 20 in this way, in step s5,
The operator manually inserts the studs 25 into the respective insertion pads 24, and the studs 25 are arranged from the respective insertion holes 24 to the space 30 as shown in FIG. 6 (4).

When the stud 25 is inserted into the insertion hole 24 and the space 30 in this way, the process proceeds to step s6, and the space 31 and the insertion hole 24 are filled with the filler 31 as shown in FIG. 6 (5). It As the filler 31, for example, fluid non-shrinkable cement mortar, resin mortar, concrete or the like is used. In this way, the filler is filled in the space 30 and the insertion hole 24.
With 31 filled, curing for a certain period of time
31 hardens. After that, the molds 26 and 27 are removed, the steel girder 20 and the PC floor slab 23 are integrally joined as shown in FIG. 6 (6), and the joining operation is completed in step s7.

In this way, the steel girder 20 and the PC floor slab 23 are indirectly joined to each other through the stud 22 which is the first joining member and the stud 25 which is the second joining member, and therefore the welding work is performed by the stud. There is only 22 and the welding work of the stud 22 is performed in the factory, so that it is not necessary to perform the welding work on site. Generally, welding work requires special techniques and is time-consuming and time-consuming.
According to the present invention, it is not necessary to perform welding work on site, the construction speed can be improved, and the construction cost can be reduced.

In the above-described embodiment, the filling material 31 is filled in the space 30 and the insertion hole 24.
However, as another embodiment of the present invention, the filling material is filled only in the space 30 and the stud 25 is inserted without hardening, and then the filling material is filled in the insertion hole 24. You may do it. Space 30 in this way
By dividing the filling work of the filling material of the insertion hole 24 and
The stud 25 inserted into the filling material filled in the space can be held at the center position of the insertion hole 24, and the stud 25 can be easily positioned in the insertion hole 24.

EFFECTS OF THE INVENTION According to the present invention, a space is formed between the base member and the member, and the second joining member is inserted through the insertion hole formed in the member to fill the filling material. There is no need to perform welding work, the joining work between the base member and the member can be simplified and speeded up, the working speed can be improved, and the joining work can be performed at a low construction cost.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a part of an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a part cut in the bridge axial direction, and FIG. 3 is mounted on a steel girder 20. A plan view of the PC floor slab 23, FIG. 4 is a perspective view for explaining the joining state of the steel girder 20 and the PC floor slab 23, and FIG. 5 is a procedure for joining the steel girder 20 and the PC floor slab 23. Fig. 6 is a flow chart for explaining the steel girder 20 and PC floor slab
FIG. 7 is a sectional view showing a simplified state of joining with 23, FIG. 7 is a partial sectional view of a typical prior art, and FIG. 8 is a diagram for explaining problems in the prior art. 20 …… Steel girder, 21 …… Upper flange, 22,25 …… Stud, 2
3 …… PC floor slab, 24 …… insertion hole, 30 …… space, 31 …… filling material

Claims (1)

[Claims] 1. A first joining member is implanted in a base member, a member having an insertion hole formed in the thickness direction is formed on the base member, and the first joining member is provided between the member and the base member. A space containing the member is formed, and a rod-shaped second joining member extending from the space over the insertion hole is inserted from the insertion hole while avoiding the first joining member, and a fluid filler is filled into the insertion hole and the space. A method for joining members, which comprises curing and joining the member and the base member.