JP7482587B2 - Joint structure of precast concrete slab members and method for constructing concrete slab structure - Google Patents

Description

The present invention relates to a joint structure for concrete slab members and a method for constructing a concrete slab structure, such as a concrete wall or slab, using precast concrete slab members, and in particular to a joint structure for precast concrete slab members and a method for constructing a concrete slab structure, which allows easy and accurate joining of precast concrete slab members constituting a wall, slab, etc., and does not require on-site concrete pouring work when joining the members.

For example, when constructing water tanks for water supply and sewerage facilities, in order to shorten construction time and streamline construction, it is often the case that precast reinforced concrete slab components are used to construct each plate-like structure consisting of a concrete wall, bottom slab, top slab, etc.

In this case, the reinforcing bars at each joint between the precast concrete slab members are generally joined with lap joints, similar to the construction of buildings as shown in Patent Document 1.

JP 7-197566 A

For this reason, in concrete plate structures constructed by joining consecutive precast reinforced concrete slab members (hereafter referred to as precast slab members), a section of about 1m of on-site poured concrete is generated in order to join the reinforcing bar joints. This requires formwork work, reinforcing bar arrangement work, concrete pouring work, etc., and the use of precast slab members cannot be said to be sufficient in shortening the construction period of wall construction or reducing the construction work.

The object of the present invention is to provide a joining structure for precast slab members and a joining method for plate-like structures that allows easy and accurate joining of precast slab members and does not require formwork work, reinforcing bar work, concrete work, etc. at each joint of a wall, slab, etc.

In order to achieve the above-mentioned object, the present invention provides a joint structure for precast plate members, in which a first groove formed by embedded structural steel is formed along the length direction at one side end edge in the width direction, and connecting bars with tip fixing hardware attached to one end are arranged at predetermined intervals along the length direction so that they protrude a predetermined amount from the first groove, and a second groove is formed along the length direction at the other side end edge in the width direction , and tip restraint hardware whose outer shape follows the shape of the second groove and whose tip protrudes a predetermined amount from the second groove is embedded so as to be arranged along the length direction of the second groove and joined to each other end of the connecting bars , wherein the side end edges of the precast plate members are butted together with the first groove and the second groove facing each other so that the tip of the tip restraint hardware is located in the first groove and the tip fixing hardware is accommodated in the accommodation space formed in the tip restraint hardware , and the space partitioned by the first groove, the second groove, and the accommodation space are filled with grout material and joined .

The end fixing hardware is preferably a fixing plate fixed to the end of the connecting bar.

The tip restraint metal preferably has a protrusion on its inner surface .

A method for constructing a concrete plate structure using a joint structure of precast concrete slab members includes forming a first groove along the length of one side edge in the width direction by embedding a steel beam , and arranging joint bars at predetermined intervals along the length direction so that joint bars having a tip fixing hardware attached to one end thereof protrude a predetermined amount from the first groove ,
A method for constructing a concrete plate structure by joining precast plate members , the precast plate members being joined to the other ends of the connecting bars ...
The method is characterized in that the precast plate member to be newly installed is slid down along the side edge of the already installed precast plate member with the first groove and the second groove facing each other so that the tip fixing hardware is accommodated in the accommodation space formed within the tip restraining hardware, the precast plate member to be newly installed and the already installed precast plate member are temporarily joined, and grout material is filled in the space partitioned by the first groove, the second groove, and the accommodation space.

According to the present invention, on-site formwork, reinforcement work, concrete work, etc. are not required at the joints of precast slab members. This shortens the construction period, reduces the number of people required, and cuts costs.

FIG. 2 is a front view showing the joining state of the precast plate members according to the first embodiment of the present invention. FIG. 1 is a perspective view of a precast plate member according to a first embodiment of the present invention. 1A is a plan sectional view taken along line IIIa-IIIa in FIG. 1, and FIG. 1B is a side sectional view taken along line IIIb-IIIb in FIG. FIG. 2 is a front view of a wall body completed by joining precast plate members according to the first embodiment of the present invention. 5 is a plan sectional view taken along the line VV in FIG. 4. FIG. 5 is a front view of a joint structure for precast plate members according to a second embodiment of the present invention. FIG. 11 is a plan view of a joint structure for a precast plate member according to a third embodiment of the present invention. FIG. 11 is a plan view of a joint structure for a precast plate member according to a fourth embodiment of the present invention. 13A is a plan view of a modified example of a joining structure of a precast plate member according to a fourth embodiment of the present invention, and FIG. 13B is an enlarged oblique view of a tip portion of the plate member of FIG. This is a schematic oblique view showing the construction state of a water storage facility using column wall members, a bottom slab, and a top slab, as a fifth embodiment of the present invention.

The joint structure of the precast concrete slab members and the method of constructing a concrete wall of the present invention will be described below with reference to the attached drawings. In the first to fourth embodiments, examples in which the precast concrete slab members are applied to wall members will be described, and in the fifth embodiment, examples in which the precast concrete slab members are applied to column wall members and slabs will be described.

[First embodiment]
1 and 4 show a joint state of precast concrete wall members according to a joint structure of a first embodiment of the present invention (FIG. 1) and a constructed concrete wall body (FIG. 4).

The joint structure 1 of the precast concrete wall member of the present invention is a structure in which precast concrete wall members 10 (hereinafter referred to as wall members 10), 10 having side ends 20, 30 with restraint parts 40 and anchorage parts 50 shown in FIG. 2 are joined facing each other. FIG. 1 shows the state of the joining work of wall members 10i, 10j. As shown in the figure, each wall member 10 is erected by joining a mechanical joint 16 at the lower end to an upper end reinforcing bar 70 that is arranged so as to protrude above a slab 71 in advance. In the joining work, the wall member 10j is slid down with its longitudinal direction vertical and erected, and is joined to the wall member 10i already erected by the joint structure of the present invention, and a concrete wall body is constructed.

(Configuration of wall member)
A wall body 11 constituting a wall member 10 (hereinafter, when the configuration of a wall member is described, the reference numeral 10 will be used) is a precast concrete member in which vertical bars 12 and horizontal bars 13 having restraining metal fittings 14 and anchoring plates 15 at both ends are arranged vertically and horizontally, as shown in FIG. 2. In this embodiment, the height, width and thickness of the wall member 10 are 3000×800×500 mm. D19 deformed bars are used for the vertical bars 12 and D13 deformed bars are used for the horizontal bars 13, and double reinforcement is provided in the wall thickness direction. A known mechanical joint 16 is joined to the lower end of the vertical bars 12, and the upper end protrudes from the upper end of the wall body 11.

A square groove 21 is formed from the top to the bottom on the end face of the side end 20 of the wall body 11, and a restraining metal fitting 14 joined to one end of the horizontal bar 13 is installed in the square groove 21 at a predetermined interval along the vertical direction of the wall, and a restraining portion 40 is formed at one end of the horizontal bar 13.

A square groove 31 is formed on the end face of the side end 30 of the wall body 11 from the upper end to the lower end of the wall member 10. In this embodiment, a channel steel 32 embedded in the side end face forms the square groove 31. A flat disk-shaped fixing plate 15 is pressure-welded to the tip of the horizontal bar 13 protruding from the square groove 31, and a fixing portion 50 is formed as a tip fixing portion at the other end of the horizontal bar 13. Since the square groove 31 is made of the channel steel 32, it is possible to prevent the wall body 11 around the square groove 31 from being damaged even if the restraining portion 40 (described later) collides with the fixing portion 50 when the wall members are joined.

3(a) and (b), the restraining hardware 14 constituting the restraining portion 40 is made of a cast metal having sufficient rigidity, and the tip of the horizontal bar 13 made of threaded reinforcing bar is screwed into the female thread formed on the inner peripheral surface of the cylindrical mounting shaft 46. The outer shape of the restraining hardware 14 is an approximately square U-shape in plan view, and the tips 42 of the opposing long sides 41 are slightly bent so as to face each other, and an accommodation space 43 is formed inside. The accommodation space 43 is formed in a tapered shape in which the distance between the long sides 41, 41 becomes slightly narrower toward the tip. The inner surface of the long side 41 of the accommodation space 43 has protrusions 44, 45. When the wall members 10 are joined, the fixing plate 15 of the fixing portion 50 of the other wall member 10 to be joined is accommodated in the accommodation space 43. The tip of the horizontal bar 13 may be pressure-welded to the end face of the cylindrical mounting shaft 46 of the restraining hardware 14 to be integrated with the horizontal bar 13.

(Wall member joining structure)
As shown in Figures 1 and 5, the joint structure 1 of the wall members 10 is formed by installing a restraining metal 14 fixed to the end of the reinforcing bar 13 of one wall member 10j so that it is in close contact with the inner surface of a square groove 21 formed in the side end 20 of the wall member 10j, and in a state in which the reinforcing bar 13 protruding from the square groove 31 formed in the side end edge 30 of the other wall member 10i to be joined and the fixing plate 15 at its end are accommodated in the accommodation space 43 of this restraining metal 14, and then filling the square grooves 21, 31 and the accommodation section 43 with grout material 60 (Figures 4 and 5).

In the constructed concrete wall (Fig. 5), when a load that generates a tensile force in the horizontal reinforcement 13 acts, in this joint structure 1, the anchor plate 15 at the end of the reinforcing bar 13 is housed in the accommodation space 43 of the restraining metal 14 and is in a state of being restrained by the grout material 60 densely packed around it, so that the pull-out force generated in the anchor plate 15 is reliably transmitted to the horizontal reinforcement 13 of the other wall member 10 to be joined via the grout material 60 in the accommodation space 43 and the restraining metal 14. This ensures a predetermined joint strength in the joint structure 1. In addition, as for the entire joint structure between the wall members 10i and 10j, the end of each restraining metal 14 is reliably housed in the channel steel 32, and the grout material 60 is densely filled in the entire clearance between the restraining metal 14 and the wall members 10i and 10j, so that the wall members 10i and 10j are joined together. In this case, the clearance between the wall members 10i and 10j only needs to be about 20 mm, so when joining the wall members 10i and 10j, formwork, reinforcing bar work, concrete work, etc. are not required, and it is sufficient to fill the grout material 60. This shortens the construction period, reduces manpower, and cuts costs.

(Method of joining wall members)
As shown in Fig. 1, the installation work of each wall member 10 is performed by inserting the upper end reinforcement 70 protruding from the slab 71 surface into the mechanical joint 16 at the lower end of the wall member 10, and joining the upper end reinforcement 70 to the mechanical joint 16, thereby erecting the wall member 10 on the slab 71 in sequence. The joining work of the wall member 10j to be erected and the wall member 10i already installed is performed by sliding down the wall member 10j (see Figs. 3(a) and 3(b)) while accommodating the fixing plate 15 and part of the reinforcing bar 13 of the fixing part 50 of the side end 30 of the wall member 10i already installed in the accommodation space 43 (Fig. 3(a)) of the restraining metal fitting 14 of the restraining part 40 of the side end 20 of the wall member 10j to be installed, and erecting the wall member 10j by inserting and joining the upper end reinforcement 70 to the mechanical joint 16 just before landing on the slab 71. As a result, each fixing portion 50 (fixing plate 15) of the wall member 10i that has already been erected is accommodated in each restraining portion 40 (restraining hardware 14) of the wall member 10j to be erected, and the temporary joining of the joining structure 1 is completed.

The procedure for joining wall member 10j to wall member 10i may involve sliding down the wall member 10j to be erected at a position slightly away from the wall member 10i already installed, then bringing the side ends of wall members 10j, 10i closer to each other, and fitting the tip of the restraining hardware 14 of the restraining part 40 of the side end 20 of the wall member 10j to be erected into the square groove 31 of the side end 30 of the wall member 10i to be joined, and aligning it with the fixing plate 15 of the fixing part 50, and sliding it down slightly to join the wall members.

Finally, the grout material 60 is densely filled into the storage space 43 of each restraint section 40, the opposing grooves 21, 31, and the gaps between the wall members 10i, 10j, completing the wall member joint structure 1 shown in Figures 4 and 5.

[Second embodiment]
6 shows a joint structure of precast concrete wall members and a method of constructing a concrete wall according to a second embodiment of the present invention. The joint structure 2 of the precast concrete wall members (wall members) is constructed by stacking the wall members 10A horizontally with the short sides of the members stacked vertically. The wall members 10A do not have any vertical reinforcement in advance as a wall body, and the vertical reinforcement 12A arranged vertically on the slab 71 is inserted into the insertion holes 11a to become the vertical reinforcement.

As shown in FIG. 6, the wall member 10A is a precast concrete member in which horizontal reinforcement bars 13 having restraining metal fittings 14 at the longitudinal end 20A of the wall body 11 and fixing plates 15 at the end 30A are arranged, and insertion holes 11a are arranged vertically in the short direction instead of vertical reinforcement bars.

The joint structure 2 of the precast concrete slab members is composed of precast concrete wall members 10A (hereinafter referred to as wall members 10A), 10A joined facing each other, each having side ends 20A, 30A, which are longitudinal ends having restraining portions 40 and fixing portions 50 as shown in FIG. 6. The wall members 10A are arranged with the short side of the wall members 10A in the vertical direction by inserting vertical bars 12A, which are arranged in rows at a predetermined interval so as to protrude above the slab 71, into the insertion holes 11a.

[Third embodiment]
In the joint structure 3 according to this embodiment, as shown in Fig. 7, the restraining hardware 14A constituting the restraining portion 40A of the wall member 10B has a constant width between the long sides. Since the accommodation space 43A is not tapered, it is easier to accommodate the fixing portion 50 of another wall member 10B in the accommodation space 43A of the wall member 10B than in the first embodiment.

[Fourth embodiment]
8, the joint structure 4 according to this embodiment differs from the first embodiment in that the restraining metal fittings 14B constituting the restraining portion 40B of the wall member 10C have a narrower gap between the tip portions 48, 48 beyond the bent portion 47. The accommodation space 43B is spaced wider around the position where the wide fixing plate 15A is disposed, and is spaced narrower around the position where the horizontal reinforcement 13 is disposed, and the grout material 60 is densely filled to form a joint having sufficient joint strength.

(Modification)
In each of the above embodiments, the fixing portion 50 was formed by the cross bars 13 and the fixing plate 15 pressure-welded to its end, but as shown in Figures 9(a) and (b), a joining structure 5 may also be used in which a mounting hardware 18 is pressure-welded across the ends of multiple cross bars 13 in the wall body 11 of the wall member 10C, and a fixing band 19 is pressure-welded to the end of the mounting hardware 18 so that it is T-shaped in a plan view, forming a fixing hardware 17, forming a fixing portion 50A.

[Fifth embodiment]
FIG. 10 is a schematic diagram partially showing an example in which the joint structure of the concrete slab member of the present invention is applied to the construction of a rainwater storage facility constructed underground. The facility shown in the figure is constructed by joining each part of a column wall member 10D, a bottom slab 10E, and a top slab 10F made of precast concrete slabs on site. The joint structure of the present invention is adopted for each joint. The figure shows a state in which the bottom slab 10E and the top slab 10F are joined to a column wall structure that has already been constructed by joining the column wall members 10D in series. Furthermore, the bottom slab 10E is shown being carried to the installation position on the rail 70. For the carrying-in and installation work of this bottom slab 10E, for example, a continuous construction method of column wall members such as Patent No. 3453553 can be used. A restraining portion 40 with restraining hardware 14 arranged in a row is formed on one side of the bottom slab 10E to be carried in and installed, and a fixing portion 50 is formed on the other side. When the base slab 10E is carried in the direction of the arrow, the column wall member 10D has already been installed at the position where it will be installed. The fixing plate (not shown) of the reinforcing bar end located in the fixing part 50 formed on the side surface of the base of this column wall member 10D is installed so as to be accommodated in the accommodation space 43 of the restraining hardware 14 of the restraining part 40 of the base slab 10E, completing the temporary joining of the two.

Furthermore, the top 25 of the column wall member 10D and the top slab 10F are joined together so that the end of the top slab 10F rests on the jaw portion formed on the top 25 of the column wall member 10D. At this time, a plurality of through holes 26 are formed in a row in the top slab 10F. The fixing rebars (not shown) of the fixing portion 50 of the top slab 10F are inserted through the through holes 26. Then, as shown in the figure, the top slab 10F is hung up to the height of the top 25 and slid slightly horizontally, so that the fixing plate (not shown) of the fixing rebar is accommodated in the accommodation space (not shown) of the restraining metal fitting 14 of the restraining portion 40. This completes the temporary joining of the top slab 10F and the top of the column wall member 10D. After that, grout filling work is performed at each joint, and a rainwater storage facility consisting of a plate-like structure can be constructed.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims. In other words, the technical scope of the present invention also includes embodiments obtained by combining technical means that are appropriately modified within the scope of the claims.

1, 2, 3, 4, 5, 6 Joint structure 10, 10A, 10B, 10C Precast concrete wall member 10D Precast concrete column wall member 10E Precast concrete bottom slab 10F Precast concrete top slab 11 Wall body 12, 12A Vertical reinforcement 13 Horizontal reinforcement 14 Restraint metal fitting 15, 15A Anchoring plate 16 Mechanical joint 17 Anchoring metal fitting 20, 30 Wall end 21, 31 Square groove 32 Channel steel 40 Restraint portion 41 Long side 42 Protrusion 43 Storage space 44, 45 Protrusion 46 Mounting axis 50, 50A Anchoring portion 60 Grout material

Claims (4)

A first groove formed by embedded steel beams is formed along the length direction at one side edge in the width direction, and connecting bars having a tip fixing hardware attached to one end are arranged at predetermined intervals along the length direction so that they protrude a predetermined amount from the first groove ,
A joint structure of a precast slab member, in which a second groove is formed along the length direction on the other side edge in the width direction , and end restraint hardware whose outer shape follows the shape of the second groove and whose end protrudes a predetermined amount from the second groove is embedded so as to be arranged along the length direction of the second groove and joined to each other end of the joint bar ,
The side end edges of the precast plate members are
The first groove and the second groove are butted against each other so that the tip of the tip restraint metal is positioned in the first groove and the tip fixing metal is accommodated in an accommodation space formed in the tip restraint metal ,
A grout material is filled into a space defined by the first groove, the second groove, and the storage space ,
A joint structure for precast concrete slab members, characterized by being joined together. 2. A joint structure for precast concrete slab members as described in claim 1, wherein the end fixing hardware is an fixing plate fixed to the end of the connecting bar. 2. A joint structure for precast concrete slab members according to claim 1, wherein the end restraint metal has a protrusion on its inner surface . A first groove formed by embedded steel beams is formed along the length direction at one side edge in the width direction, and connecting bars having a tip fixing hardware attached to one end are arranged at predetermined intervals along the length direction so that they protrude a predetermined amount from the first groove ,
A method for constructing a concrete plate structure by joining precast plate members , the precast plate members being joined to the other ends of the connecting bars ...
A method for constructing a concrete slab structure, comprising: sliding down and installing a new precast plate member to be installed along the side edge of an already installed precast plate member while aligning the first groove and the second groove so that the tip fixing hardware is accommodated in the storage space formed within the tip restraining hardware; temporarily joining the precast plate member to be installed and the already installed precast plate member; and filling the space partitioned by the first groove, the second groove, and the storage space with grout material.

Images