JP3620651B2 - Joining structure of members - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joining structure of members that can be applied when constructing an underground structure.
[0002]
[Prior art]
As a method of constructing an underground structure, box bodies such as rectangular steel pipes are inserted into the ground so as to be parallel to each other, and concrete is placed inside the box body, so that the walls of the underground structure, the ceiling surface, It is done to the bottom.
[0003]
In this type of underground structure, when building a floor slab or wall in the interior, the floor slab or wall may be connected to and supported by the underground structure.
Conventionally, for example, as shown in FIG. 12, the box body 91 is inserted into a hole excavated in the ground in advance with the fixing bar 92 attached in advance to the box body 91 so as to penetrate the box body 91. The reinforcing bars 92 are attached to the reinforcing bars 93 at the ends of the floor slab and the wall with a coupler 94.
On the other hand, a method of press-fitting a box without excavating a hole in the ground has also been implemented. In this method, as described above, the fixing stripe 92 cannot be attached to the box 91. This is because if the fixing bars are attached to the box in advance, the worker cannot move inside the box and cannot remove the earth and sand inside the box.
[0004]
[Problems to be solved by the invention]
The subject of this invention is providing the joining structure of the member which can attach another concrete member simply to the member formed by filling concrete into the box which consists of steel press-fit in the ground. is there.
[0005]
[Means for Solving the Problems]
The invention according to claim 1, for example 2, as shown in FIG. 3, Ri Do from steel, internally formed by filling the concrete 12 to a member of the box (steel pipe) 11 which is press-fitted into the ground, the other 1 and 2, which are joint structures 1 and 2 of members to which concrete members (concrete slabs) 20 and 25 are attached,
And rebar 21 and 26 of the end portion of the concrete member 20 and 25, a fixing member 30, 35 disposed inside the box body 11 after removing the inside of sediment of the box body 11, the box body 11 It is characterized by being joined to each other by a mechanical joint 40 so as to pass through a hole 11a provided on the surface of the steel.
[0006]
According to the first aspect of the present invention, the box body is press-fitted into the ground, the earth and sand inside the box body is removed, the fixing material is inserted into the box body, and the reinforcing bars of the concrete member and the inside of the box body are inserted. The fixing material can be connected so as to penetrate the hole on the surface of the box. Therefore, the member formed by filling concrete into the box made of steel press-fitted into the ground can be easily joined to the concrete member.
[0007]
The invention according to claim 2 is, for example, as shown in FIG. 2, in the member joint structure 1 according to claim 1.
The fixing material 30 is a reinforcing bar including a hook 31 that engages with the concrete 12 filled in the box 11, and is joined to the reinforcing bar 21 at the end of the concrete member 20 by a mechanical joint 40. It is characterized by that.
[0008]
According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the fixing material is a reinforcing bar provided with a hook that engages with the concrete filled in the box. Since the end of the concrete member is joined to the reinforcing bar by a mechanical joint, the concrete member can be firmly attached to a member formed by filling concrete inside a box made of steel.
[0009]
The invention according to claim 3 is, for example, as shown in FIG. 3, in the member joint structure 2 according to claim 1.
The fixing unit 36 is a fixing bracket that engages with the concrete 12 filled in the box 11, and the fixing material 35 is fixed to engage with the concrete 12 filled in the box 11. The reinforcing bar is provided with a metal fitting 36 and is joined to the reinforcing bar 26 at the end of the concrete member 25 by a mechanical joint 40.
Here, examples of the fixing metal fitting include a disk-shaped metal plate that extends in a plane orthogonal to the arrangement direction of the reinforcing bars of the concrete member.
[0010]
According to the invention described in claim 3, the same effect as that of the invention described in claim 1 can be obtained, and the fixing material can be a reinforcing bar provided with a fixing metal fitting that engages with the concrete filled in the box. In addition, since the mechanical member is joined to the reinforcing bar at the end of the concrete member, the concrete member can be firmly attached to the member formed by filling the concrete inside the box made of steel.
[0011]
The invention according to claim 4 is the member joining structure 2 according to any one of claims 1 to 3, for example, as shown in FIG.
The concrete member 25 is made of precast concrete.
[0012]
According to the invention described in claim 4, the same effect as in the invention described in any one of claims 1 to 3 can be obtained, and the concrete member is made of precast concrete, so that the concrete is formed inside the box made of steel. The bar arrangement work when attaching the concrete member to the member filled with is omitted, and the time and cost required for construction can be reduced.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a joining structure of members of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an outline of the joining structures 1 and 2 of the members according to the respective embodiments.
[0014]
[First Embodiment]
FIG. 2 is a cross-sectional view showing a member bonding structure 1 according to the present embodiment.
As shown in FIGS. 1 and 2, the member joining structure 1 of the present embodiment is inserted into the ground in parallel with each other, and a steel pipe (a box made of steel) 11 constituting a ground continuous wall. A concrete slab (concrete member) 20 is attached to a member formed by filling concrete 12 into the interior of the steel slab 20, and a reinforcing bar 21 at the end of the concrete slab 20 and a reinforcing bar ( The fixing member 30 is roughly configured to be joined to each other so as to penetrate the hole 11 a provided on the surface of the steel pipe 11.
The reinforcing bar 30 includes a hook 31 that engages with the concrete 12 filled in the box 11, and is joined to the reinforcing bar 21 at the end of the concrete member 20 by a mechanical joint 40.
[0015]
In order to construct the joining structure 1 for members, first, steel pipes 11 are inserted into the ground in parallel and adjacent to each other, and earth and sand inside the steel pipes 11 are removed to constitute an outer structure of the underground structure. At this time, the hole 11a provided on the surface of the steel pipe 11 is set to the construction height of the concrete slab 20 of the underground structure.
Next, a reinforcing bar (fixing material) 30 having hooks 31 is installed inside the steel pipe 11, and concrete 12 is placed. Then, the reinforcing bar 21 of the concrete slab is arranged, and the reinforcing bar 21 of the concrete slab and the reinforcing bar 30 inside the steel pipe 11 are joined by the mechanical joint 40 using the hole 11a.
Then, the concrete 22 of the concrete slab 21 is placed to complete the joining structure 1 of this member.
[0016]
[Second Embodiment]
FIG. 3 is a cross-sectional view showing the member joining structure 2 of the present embodiment.
As shown in FIG. 1 and FIG. 3, the member joining structure 2 according to the present embodiment is inserted into the ground in parallel and adjacent to each other, and a steel pipe (box body made of steel) 11 constituting a ground continuous wall. A concrete slab (concrete member) 25 made of precast concrete is attached to a member filled with concrete 12 inside, and disposed inside the steel bar 11 and the reinforcing bar 26 at the end of the concrete slab 25. The rebar (fixing material) 35 is generally configured by being joined to each other by a mechanical joint 40 so as to pass through a hole 11 a provided on the surface of the steel pipe 11.
Here, as shown in FIG. 6, the fixing metal fitting 36 is a disk-shaped metal plate extending in a plane orthogonal to the reinforcing bar 35.
[0017]
In order to construct the joint structure 2 for members, as in the first embodiment, first, the steel pipes 11 are inserted into the ground adjacent to each other in parallel, the earth and sand inside the steel pipes 11 are removed, and the underground structure Construct an outer shell. At this time, the hole 11a provided on the surface of the steel pipe 11 is set to the construction height of the concrete slab 20 of the underground structure.
Next, a reinforcing bar (fixing material) 35 including a fixing metal fitting 36 is installed inside the steel pipe 11, and the concrete 12 is placed. Then, the concrete slab 20 made of precast concrete is suspended inside the underground structure, and the reinforcing bar 26 of the concrete slab and the reinforcing bar 35 inside the steel pipe 11 are joined by the mechanical joint 40 using the hole 11a. To do.
And concrete is cast in the inside of the steel pipe 11, and the joining structure 2 of this member is completed.
[0018]
[Experimental example]
The result of the experiment conducted in order to measure the performance of the joining structure of the members according to the present invention will be described.
In this experiment, positive and negative alternating compression repeated bending force test was performed on two specimens of about half the size (500 mm square) of specimen A shown in FIG. 4 and specimen B shown in FIG. Went. 11A and 11B correspond to the box in the present invention, and 20A and 20B correspond to the concrete member in the present invention.
In the specimen A, the concrete member 20A is joined to the box 11A by the fixing material 30A whose fixing portion is the hook 31A. In the specimen B, the concrete member 20B is joined to the box 11B by a fixing material 35B whose fixing portion is a fixing bracket 36B.
[0019]
The steel material used for the box bodies 11A and 11B of both specimens is SM400 (JIS: Japanese Industrial Standard) (t = 9 mm).
Moreover, the blend of concrete 12A and 12B used for both specimens is 4.5% of air amount, 60% of water cement ratio, 47.4% of fine aggregate ratio (S / a), unit water amount of 177 kg / m ³ , unit cement content 295 kg / ^{m 3,} coarse aggregate weight 972kg / ^{m 3,} fine aggregates weight 835 kg / ^{m 3,} admixture (AE water reducing agent) is weight 0.738kg / ^{m 3.}
D16 (SD295) (JIS) is used for the reinforcing bars (main bars) 41A and 41B and the fixing members 30A and 35B of the concrete members 20A and 20B. D10 (SD295) (JIS) is used at 125 mm pitch for the streaks of the concrete members 20A and 20B.
The strength of the concrete used for specimen A and specimen B is 29.2 N / mm ² and 30.7 N / mm ² , respectively.
[0020]
In the specimen A, a 180-degree hook (bending diameter 40 mm, extra length 70 mm) is used as the fixing portion 31A. In the specimen B, the fixing portion 36B has M = 20 mm, φ = 43 mm, and t = 16 mm shown in FIG. A screw-in type EG fixing plate (manufactured by Tetsuken Corporation) is used.
Further, both specimens use a mechanical joint 40 having a sufficient bonding strength to a D16 (SD295) (JIS) rebar.
[0021]
In the applied force experiment, the horizontal relative displacement at the actual yield value obtained in advance in a state where a constant compression force of 20 kN was applied to the members 10A and 10B filled with the concrete 12A and 12B inside the boxes 11A and 11B. + Δ1, + δ1, -δ1, + δ2 (2 · δ1), -δ2, ..., + δ8 (8 · δ1), and -δ8 are repeatedly subjected to repeated bending force, and then the loaded load The force was applied until the value decreased, and the experiment was terminated.
[0022]
FIGS. 7 and 8 show graphs of the loaded load-relative horizontal displacement amount in this force test for each of the specimen A and specimen B. FIG.
As shown in FIG. 7 and FIG. 8, both specimens show the fracture property of the bending yield-preceding type in which the reinforcing bars 41A and 41B of the concrete members 20A and 20B are first yielded, and then the horizontal relative displacement ± Up to 8δ, it was confirmed that the joints between the members 10A and 10B and the concrete members 20A and 20B exhibited sufficient toughness and excellent energy absorption capability.
[0023]
According to the joining structure 1 for members described in the first embodiment, the box body 11 is press-fitted into the ground, the earth and sand inside the box body 11 is removed, the reinforcing bars 30 are inserted into the box body 11, and the concrete The reinforcing bar 21 of the member 20 and the reinforcing bar 30 inside the box 11 can be connected so as to penetrate the hole 11 a on the surface of the box 11. Therefore, the member 10 formed by filling the concrete 12 in the box 11 made of steel press-fitted into the ground and the concrete member 20 can be easily joined.
[0024]
Further, since the reinforcing bar 30 includes a hook 31 that engages with the concrete 12 filled in the box 11 and is joined to the reinforcing bar 21 at the end of the concrete member 20 by a mechanical joint 40, it is made of steel. The concrete member 20 can be firmly attached to the member 10 in which the concrete 12 is filled inside the box 11.
[0025]
According to the joint structure 2 for members described in the second embodiment, the box 11 is press-fitted into the ground, the earth and sand inside the box 11 is removed, and the reinforcing bar 35 is inserted into the box 11. The rebar 26 at the end of the precast concrete member 25 and the fixing material 35 inside the box 11 can be connected so as to penetrate the hole 11 a on the surface of the box 11. Therefore, the member 10 in which the concrete 12 is filled inside the box 11 made of steel press-fitted into the ground and the concrete member 25 can be easily joined.
[0026]
The reinforcing bar 35 is a reinforcing bar provided with a fixing metal fitting 36 that engages with the concrete 12 filled in the box 11, and is joined to the reinforcing bar 26 at the end of the concrete member 25 by a mechanical joint 40. A concrete member can be firmly attached to a member formed by filling concrete inside a box made of steel.
[0027]
Further, since the concrete member 25 is made of a precast concrete member, the fixing material 35 is inserted into the box body 11, and the reinforcing bar 26 at the end of the precast concrete member 25 and the fixing material 35 inside the box body 11 are connected. And it can connect so that the hole 11a of the box 11 surface may be penetrated. Therefore, since the construction period is shortened by the concrete member 20 being precast, the concrete member 20 can be easily joined to the member 10 in which the concrete 12 is filled in the box 11 made of steel. This can reduce the time and cost required for construction.
[0028]
In addition, the joining structure of the member of this invention is not limited to said each embodiment, You may perform a various improvement and design change in the range which does not deviate from the meaning of this invention.
For example, in the present embodiment, the joint structure of the member for attaching the concrete slab 20 or 25 to the member formed by filling the concrete 12 in the steel pipe 11 constituting the underground continuous wall has been described. For example, FIG. The present invention can also be applied to the case where the concrete floor 55 and the wall 65 are joined to the underground continuous walls 50 and 60 arranged in the direction as shown in FIG.
Further, for example, as shown in FIG. 11, the present invention can also be applied when a concrete beam 75 is joined between concrete-filled steel pipe columns 70.
Further, the reinforcing bar at the end of the concrete slab (concrete member) may be inserted into a hole provided in the steel pipe (box), and the fixing bracket may be screwed into the tip.
In addition, it is needless to say that specific detailed structures and the like can be appropriately changed.
[0029]
【The invention's effect】
According to the first aspect of the present invention, the box body is press-fitted into the ground, the earth and sand inside the box body is removed, the fixing material is inserted into the box body, and the reinforcing bars of the concrete member and the inside of the box body are inserted. The fixing material can be connected so as to penetrate the hole on the surface of the box. Therefore, the member formed by filling concrete into the box made of steel press-fitted into the ground can be easily joined to the concrete member.
[0030]
According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and the fixing material is a reinforcing bar provided with a hook that engages with the concrete filled in the box. Since the end of the concrete member is joined to the reinforcing bar by a mechanical joint, the concrete member can be firmly attached to a member formed by filling concrete inside a box made of steel.
[0031]
According to the invention described in claim 3, the same effect as that of the invention described in claim 1 can be obtained, and the fixing material can be a reinforcing bar provided with a fixing metal fitting that engages with the concrete filled in the box. In addition, since the mechanical member is joined to the reinforcing bar at the end of the concrete member, the concrete member can be firmly attached to the member formed by filling the concrete inside the box made of steel.
[0032]
According to the invention described in claim 4, the same effect as in the invention described in any one of claims 1 to 3 can be obtained, and the concrete member is made of precast concrete, so that the concrete is formed inside the box made of steel. The bar arrangement work when attaching the concrete member to the member filled with is omitted, and the time and cost required for construction can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a joining structure of members according to the present invention.
FIG. 2 is a cross-sectional view showing an example of a joining structure of members according to the present invention.
FIG. 3 is a cross-sectional view showing another example of the joining structure of members according to the present invention.
FIG. 4 is a side view showing a specimen for an experiment for measuring the performance of the joining structure of members according to the present invention.
FIG. 5 is a side view showing a specimen for an experiment for measuring the performance of the joining structure of members according to the present invention.
6A and 6B show examples of fixing metal fittings in a member joining structure according to the present invention, wherein FIG. 6A is a front view, and FIG. 6B is a side view.
FIG. 7 is a graph showing the results of an experiment for measuring the performance of the joint structure of members according to the present invention.
FIG. 8 is a graph showing the results of an experiment for measuring the performance of the joint structure of members according to the present invention.
FIG. 9 is a perspective view showing still another example of the joining structure of members according to the present invention.
FIG. 10 is a perspective view showing still another example of the joining structure of members according to the present invention.
FIG. 11 is a perspective view showing still another example of the joining structure of members according to the present invention.
FIG. 12 is a perspective view showing still another example of the joining structure of members according to the present invention.
[Explanation of symbols]
1, 2 Member connection structure 11 Box (steel pipe)
12 Concrete 20, 25 Concrete member (concrete slab)
21, 26 Reinforcing bar 30, 35 Fixing material (reinforcing bar)
31 Hook 36 Fixing bracket 40 Mechanical joint

Claims (4)

Ri Do of steel, in the interior formed by filling the concrete member of the box body press-fitted into the ground, a joint structure of members other concrete element is attached,
The reinforcing bars arranged inside the box after removing the earth and sand inside the box after penetrating the reinforcing bars at the end of the concrete member pass through the holes provided on the surface of the box. And a joining structure of members characterized in that they are joined together by a mechanical joint . In the joining structure of the member of Claim 1,
The fixing material is a reinforcing bar having a hook that engages with concrete filled in the box, and is joined to a reinforcing bar at an end of the concrete member by a mechanical joint. Junction structure. In the joining structure of the member of Claim 1,
The fixing material is a reinforcing bar including a fixing metal fitting that engages with concrete filled in the box, and is joined to a reinforcing bar at an end of the concrete member by a mechanical joint. Bonding structure. In the joining structure of the member in any one of Claims 1-3,
The said concrete member consists of precast concrete, The joining structure of the member characterized by the above-mentioned.

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