JP2945282B2 - Precast concrete slab joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining adjacent slabs of a precast concrete slab used for a floor slab or a pavement of a bridge.

[0002]

2. Description of the Related Art Replacement of slabs of deteriorated steel bridges, roads,
Since it can be constructed on an apron pavement or a parking lot at an airport in a short construction period, the demand for a covering work using a precast concrete slab is increasing. With regard to pavement, in particular, the use of precast concrete slabs has been increasing since the new construction, taking advantage of the fact that replacement is relatively easy. When laying precast concrete slabs to make paving slabs, there is a problem in the joint treatment between the concrete slabs.Therefore, various measures have been taken to ensure smooth contraction of the concrete slab due to changes in temperature and transmission of the load. Japanese Patent Publication No. Hei 3-26721, Japanese Utility Model Laid-Open Publication No. Hei 5-26167, Japanese Patent Laid-Open Publication No. Hei 6-26004, and the like provided by the inventors of the present invention have been proposed.

[0003] Of these, Japanese Patent Publication No. 3-26721 discloses a method in which a round bar is buried between concrete plates at a joint between concrete plates to transmit a vertical load. The function of the expansion joint is intended to be performed by slipping. Generally, these concrete slabs have a rectangular shape of, for example, 7.5 m in width and 100 m in length, and the expansion joint satisfies the necessary functions for expansion and contraction in the length direction of the concrete slab. In the width direction, transmission of vertical load is more important than consideration of expansion and contraction of the concrete slab. Rather, there is a drawback that the round concrete slips and the adjacent concrete slabs that have been pushed down during expansion are left at the time of contraction, resulting in voids between the concrete slabs.

A means for solving this problem is disclosed in Japanese Utility Model Laid-Open No. 5-261.
No. 67, Japanese Unexamined Patent Publication No. 6-260004 and the like. The former uses bolts with both ends screws and attempts to tighten the concrete slabs with a connecting nut. In the latter case, the connecting bolts are connected by a coupler at the middle (joint portion of the concrete plate). In each case, the concrete slabs are to be rigidly connected to each other, and the concrete slabs are held to each other, and the above-mentioned disadvantages are covered.

[0005] However, the above technique requires the installation and tightening of a relatively large number of connection bolt nuts, and the technique disclosed in Japanese Patent Application Laid-Open No. Hei 6-260004 involves coupling by a coupler and introduction of tension. Problems requiring cost and labor, and also require large working holes in the surface of precast concrete slabs for their work,
There were problems with the labor and durability of filling the remains.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems, reduces costs and saves labor, requires only the necessary minimum cross-section reduction and trace filling processing, and provides a precast concrete plate that can be securely joined. Develop and provide a joining method.

[0007]

SUMMARY OF THE INVENTION The present invention comprises the following technical means in order to solve the above problems.
That is, according to the present invention, when joining adjacent precast concrete plates, a reinforcing steel storage hole is provided in one of the precast concrete plates, which is opened at the joint end face, and a deformed steel bar resiliently projectable from the joint end face is accommodated in the reinforcing steel storage hole. In addition to the above, a connecting hole into which this reinforcing bar enters is provided in the other precast concrete plate, and the precast concrete plate is arranged with the deformed steel bar facing the inlet of the connecting hole, and the reinforcing bar is propelled by compressed air. A precast concrete, wherein the reinforcing bar is inserted into the joint hole to position the reinforcing bar in both the precast concrete plates, and the storage hole and the connecting hole are filled with a filler to fix the reinforcing bar to both the concrete plates. It is a method of joining plates.

[0008] In this case, the rebar is made of air or grout liquid,
It is preferable to propel it with a fluid such as mortar.

[0009]

According to the method for joining adjacent precast concrete slabs of the present invention, a deformed steel bar resiliently protruding from the end face is built in, and is inserted into the joining hole of the adjacent concrete slab, and the filler is filled in both concrete slabs. To fix. It is not an expansion joint because it is fixed to both concrete slabs.

On the surface of the precast concrete slab,
It is preferable to provide only a small-diameter hole for propulsion of the reinforcing bar and injection of the filler. A commercially available deformed steel bar is used as a reinforcing bar. The method for joining precast concrete slabs of the present invention does not use nuts, couplers, or the like, but is based on the adhesion between the reinforcing material and the filler injected into the reinforcing-hole storage hole or the connection hole.

Accordingly, no extra material or labor is required. Also, the required minimum cross-section reduction and trace filling processing are sufficient, and reliable bonding can be performed. When the reinforcing bar is propelled, it is easy to use compressed air, and when the bar is propelled with a fluid such as a grout liquid or mortar, grout filling and hole closing can be achieved at the same time, which is preferable.

The dimensions of the deformed steel bar can be appropriately determined by design according to the scale of the precast concrete slab, etc., but usually, the diameter is about 20 to 38 mm and the length is 50.
It may be about 0 to 1000 mm.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of joining a precast concrete slab according to the present invention will be described with reference to the drawings of the embodiment. FIG. 1 shows precast concrete slabs 10 and 2 of an embodiment of the present invention.
It is sectional drawing which shows the junction part of No. 0. Adjacent precast concrete slabs 10 and 20 are adjacent via joints 40, both of which are joined by deformed steel bars 30. The deformed steel bar 30 is fixed by filling a filler (mortar) 31 in the reinforcing-bar storage holes 11 and 14 provided in the precast concrete plate 10 and a mortar 31 is provided in a coupling hole 21 provided in the precast concrete plate 20. Filled and fixed. The mortar 31 is injected from injection holes 12, 13, 22 formed in the upper surface of the concrete slab.

The procedure of the method for joining the precast concrete slabs of the present invention will be described with reference to FIGS. The precast concrete paving slabs of the examples have a plate size:
2.5 m × 10.0 m, plate thickness: 200 mm, deformed steel bar for connection: 32 mmφ × length 700 mm. The construction order is as follows. (1) As shown in FIG. 2, storage holes 11 and 14 for storing deformed steel bars 30 for connecting precast concrete slabs.
Is opened to the joint end face 15 to produce the precast concrete plate 10 provided in the concrete plate. The storage holes 11 and 14 have a total length of about 700 mm, and the storage hole 11 at the back has an inner diameter of about 35 mm and a length of about 350 mm. The entrance side storage hole 14 has an inner diameter of about 50 mm and a length of about 350 mm.
mm.

Adjacent precast concrete slab 20
Is opened in the end face 23 so that the coupling hole 21 faces the above-mentioned deformed steel bar 30 steel bar, and is provided inside the concrete slab. The size of the coupling hole 21 is about 5 mm in inner diameter.
0 mm and a length of about 350 mm. The precast concrete slabs 10, 20 are transported to the laying site. Before laying, the storage holes 11 and 1 of one precast concrete
4 stores a deformed steel bar 30 for connection. Laying concrete slabs in place. Next, the joint 40 is opened and the adjacent precast concrete slab 20 is laid so that the joint hole 21 faces the deformed steel bar 30. FIG. 2 shows a state where the precast concrete slabs 10 and 20 of the embodiment are arranged on the site. (2) FIG. 3 shows a state where the deformed steel bar 30 is being propelled. The packing 41 is inserted into the joint between the reinforcing steel storage hole 14 and the joint hole 21 so that the adjacent concrete slab 20 is inserted.
Is completed, a fluid such as a grouting liquid is injected into the deep portion of the storage hole 11 from the hole 12 at the deep portion of the reinforcing bar storage hole 11 to propel the stored deformed steel bar 30, and the opposing precast concrete plate 20 into the coupling hole 21.

As a method of propelling the deformed bar 30,
A fluid such as the above grout liquid may be injected, or the fluid may be pushed using compressed air by an air compressor or the like, and then a filler such as mortar, grout, or resin may be injected. When using a filler such as mortar, grout, resin or the like from the beginning, it is necessary to consider the use of a filler that has curability over time, but the steps can be omitted, which is preferable. (3) As shown in FIG. 4, when the deformed steel bar 30 is propelled and pushed into the joint hole 21, the filler 31 is injected into the steel bar storage hole 14 and the joint hole 21. Injection is made with the reinforcing steel storage hole 14
And the injection is performed from the hole 13 or the hole 22 provided at the back of the coupling hole 21. It is preferable to inject from one hole 13 or 22 and to confirm that the filler 31 overflows from the other hole to the upper surface of the precast concrete slab. FIG.
Shows the structure of the above-mentioned packing 41 for preventing the filler 31 from leaking from the joint 40. FIG. 5A is a vertical cross-sectional view, and FIG. 5B is a view taken along the line BB.

Further, in order to strengthen the adhesion between the deformed steel bar 30 and the concrete, it is more effective to use a filler having a slight expansion performance upon hardening. FIG. 6 shows another preferred example to which the present invention is applied. In this example, when a large number of precast concrete slabs 50 are juxtaposed on the upper surface of a bridge girder 51 or the like, joints 40 of these concrete slabs are joined by the method of the present invention. All joining of the precast concrete slab 50 can be performed from the upper surface of the concrete slab 50, and can be easily performed in a short construction period.

[0018]

According to the present invention, commercially available deformed steel bars are used, no need for nuts, couplers, etc., and there is no introduction of tension and no section loss due to a large working hole. Precast concrete slabs can now be joined.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method of joining a precast concrete slab of an example.

FIG. 2 is a process chart of a method for joining a precast concrete slab according to an example.

FIG. 3 is a process chart of a method for joining a precast concrete slab according to an example.

FIG. 4 is a process diagram of a method for joining a precast concrete slab according to an example.

5A is a sectional view showing packing, and FIG.

FIG. 6 is a perspective view showing an application example of the present invention.

[Explanation of symbols]

10, 20, 50 Precast concrete slabs 11, 14 Reinforcement storage holes 12, 13, 22
Hole 15, 23 End face 21 Connection hole 30 Deformed steel bar 31 Filler (mortar) 40 Joint 41 Packing 51 Bridge girder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E01C 11/06 E01C 5/06

Claims (1)

(57) [Claims] When joining adjacent precast concrete slabs, one of the precast concrete slabs is provided with a rebar storage hole opening at the joint end face, and a deformed steel bar resiliently projectable from the joint end face is accommodated in the rebar storage hole. At the same time, a connecting hole through which the rebar enters is provided in the other precast concrete slab, the precast concrete slab is arranged with the deformed steel bar facing the inlet of the connecting hole, and the rebar is propelled by compressed air. And moving the reinforcing bar into both the precast concrete slabs, filling the storage holes and the connecting holes with a filler, and fixing the reinforcing bars to both the concrete slabs. The method of joining precast concrete slabs.