JPH09100503A - Connecting jig of precast concrete slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate its manufacture, execution of work and exchange by mounting a connecting jig on a corner area and an edge area of road pavement precast concrete slab. SOLUTION: A connecting jig main body 1, which is mounted on a corner area and an edge area of road pavement precast concrete slab, is fixed with the slab with a fixing anchor 2. A threaded hole 5a of a level adjusting bolt 5 is provided on a base plate while a connecting hole 4 of a slab-to-slab connecting bolt 3 is provided on a side plate. The threaded hole 5a on the base plate is used as a grout injection hole so as to fill up the clearance between the slab and the base board during construction time and also used as a threaded hole of a lifting eye bolt. It is therefore, possible to facilitate the manufacture, lifting movement, elevation adjustment, slab connection and filling work of grout material and so forth by mounting the connection jig main body 1. It is also easy to replace the slabs after the execution of work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete slab connecting jig for facilitating movement of a precast concrete slab, height adjustment during installation, connection between the plate and the plate, and grout injection.

[0002]

2. Description of the Related Art Precast concrete slabs that have been conventionally used for pavement of road surfaces such as roads are manufactured in advance in factories, so that curing of concrete slabs on the pavement site is not necessary and homogeneous products can be manufactured. It is widely used in the field where the construction period is required to be shortened or the construction time is limited by taking advantage of the advantage. Precast concrete slabs that have been put into practical use at such sites include prestressed precast concrete slabs (hereinafter referred to as "PS slabs") in which a compressive force is introduced in advance to cancel tensile stress due to static load or dynamic load. )), Reinforced precast concrete slabs with embedded reinforcing bars (hereinafter referred to as “RC slabs”), and unreinforced precast concrete slabs (hereinafter “unreinforced slabs”) However, when laying these precast concrete slabs, the following procedures and methods are generally used.

Regarding the connection of the plain plates, the base plate for laying the plain plates is subjected to an extremely flat finish, and then the plates are directly abutted on each other without being connected to each other. Therefore, the plates are not directly connected.

The installation adjustment in the PS plate is carried out in the vertical direction of the plate in advance while holding the plate and the adjacent plate on the same plane through the H-shaped steel in which anchor bolts are set up and fixed on the surface of the plate in advance. The flatness is maintained by injecting a filling material such as a grout material down through the small holes that have been made so as to fill a gap generated between the plate and the substrate.

In the RC plate, a cap nut-shaped insert reaching the plate bottom is buried when the plate is manufactured, and when the plate is installed, a long bolt is screwed in until it comes into contact with an iron plate previously arranged on the plate bottom side. According to the method described above, the height between the plates is adjusted, and the grout filler is poured down through a small hole vertically formed in the plate to fill the gap between the plate and the base.

Among the precast concrete slabs, the horn joint method and the slip bar joint method are known as the method of connecting the plates in laying the PS plate.

FIG. 9 shows PS by the horn joint method.
FIG. 10 is an explanatory view showing a cross section of a connecting portion for connecting the plates. In FIG. 9, reference numeral 30 is an arc-shaped horn pipe having a hollow inside, and the horn pipe 30 has a spiral with an outer periphery thereof indicated by reference numeral 31. It is reinforced by the spiral-shaped rebar. Reference numeral 32 denotes a reinforcing connecting reinforcing bar which is inserted into the horn pipe 30 when the horn pipe 30 is embedded and is connected to the plate, and which is bent into an arc shape and serves as a core material for the connection. , This rebar 32
Asphalt coating treatment is applied to the entire outer peripheral portion of the rust preventive material. Further, a rust preventive material coating treatment 33 for preventing rust caused by leakage of water such as rainwater is generated near the joint between the plates of the combined reinforcing bars 32. Has been done. Reference numeral 7 is a joint rebar 32
It shows a filling material such as cement grout material or the like, which is poured into the horn pipe 30 in which the horn pipe is inserted and is intended to fill the horn pipe.

FIG. 10 is an explanatory view showing a cross section of a connecting portion for connecting PS plates by the slip bar joint method. The plate and plate connecting method by the slip bar joint method is one plate in one plate. When manufacturing, a cylindrical hollow tube 40 having a compressed air supply port / mortar injection port 41 and a compressed air discharge port 41a was previously formed, and a slip bar 32 was inserted into the cylindrical hollow tube 40. There is. In addition, the plate to be connected is formed with an insertion hole 42 which is inserted when the slip bar 32 is pushed out by the compressed air supplied from the compressed air supply port 41 and moved forward. It has a structure having an inlet 43 for a filling material such as a grout material. Then, when the predetermined forward movement of the connecting rebar 32 is completed, the compressed air supply port / mortar injection port 41 and the compressed air discharge port 4 are also provided.
The cement grout filler 7 is filled from 1a and the filler injection port 43 to be connected.

The RC plate joint method is known for connecting RC plates, and FIG. 11A is an explanatory view showing a cross section of a connecting portion for connecting plates by the RC plate joint method. FIG. 11B is a view taken along the line II-II in FIG. 11A, and the RC plate joint method is used to connect plates to each other. A concave groove 50 having a predetermined depth is formed in a direction perpendicular to the edge, and when the plate is installed, the position of the concave groove 50 of the plate connected to the concave groove 50 is made coincident with each other, and then the slip bar 44 serving as a core material is formed. After dropping, the filling material 45 such as cement concrete is further filled into the concave groove 50 to be connected.

[0010]

Since the precast concrete slabs connected and laid in this way are repeatedly used to start, run, and stop the vehicle after being in service,
There is a case where the plates are separated from each other due to the influence of these operations, and a step is generated as a function of these operations, and a strong connection state is required to prevent such a phenomenon.

As the connecting method for that purpose, the above-mentioned several methods have been implemented, but there are the following problems.

In the case of a plain plate, an extremely flat finish accuracy is required when constructing the base of the lower part of the plate in order to install it in a state where there is no step between the plates and there is no rattling. It takes. Further, since the plates are not connected to each other, there is a drawback that the plates are displaced when the vehicle runs.

Since the horn joint method and the slip bar joint method of the PS plate can keep the plate surface flat without being largely influenced by the plane condition of the substrate,
This is a more advanced method than the plain installation. However, in order to maintain the flatness between the plate and the adjacent plate, it is necessary to set up the anchor bolts for attaching the H-shaped steel to the plate surface, and the plate height adjustment has already been installed. Since the construction is performed based on the plate, there is little freedom in construction. Further, regarding the connection of the plates, there is a disadvantage that the slip bar cannot be inserted into the pipes of the adjacent plates when the plates are installed unless the pipes are accurately installed and the plates are not manufactured.

In the plate-to-plate connection method by the RC plate joint method, jigs for lifting and height adjustment of the plates and injection pipes for the filler must be buried in advance when the plates are manufactured. If it is used for transportation because it takes time and it is likely to be a strength defect of the plate,
There is a drawback in that the groove edge may be lost or damaged.

Therefore, the present invention has been made in order to improve these drawbacks and the like, and is to adjust the height of a precast concrete slab composed of a PS plate or an RC plate when it is lifted, moved, or installed, and further, Enables filling and injecting grout material into the gap between the plate and the foundation and connecting the plate and plate accurately and easily.
After being used as road surface pavement, even if the slab is damaged, the slab can be replaced within a short time by attaching and detaching the jig connecting bolts and nuts. It is an object of the present invention to provide a height adjusting pipe that is also used as a filling material injecting device for a jig.

[0016]

The first feature of the present invention to achieve the above object is to provide a box-shaped pre-cast concrete slab for road paving with corners or box-shaped portions arranged at corners and edges. In the connecting jig, the side plate of the connecting jig is provided with a fixing anchor for fixing to the precast concrete slab, and a drilling hole is formed for connecting with another slab, The bottom plate of the connecting jig should have screw holes for moving the plate, adjusting the height of the gap between the plate and the base, and filling the gap with filling material. Is.

Further, as a second feature, the height adjusting pipe for filling and injecting the filler used in the connecting jig not only adjusts the height of the plate, but also has a hollow structure inside to discharge the filler. Forming the outlet at the end.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION PS plate or RC according to the present invention
An embodiment of a connecting jig for a precast concrete slab made of a plate will be described below.

The connecting jig of the precast concrete slab of the present invention has a box-like shape, and a hole for attaching an eyebolt for moving the plate from the form frame by lifting or the like at the time of producing the plate at the bottom thereof. A hole is formed, but in the case of laying a plate, this hole has a height difference between the upper surface of the existing plate and the upper surface of the non-installed plate to be installed. A height adjustment bolt is attached to enable height adjustment.To inject a filling material such as fast-setting cement grout material into the gap between the laid plate and the underlying substrate. It also has the function of raising the injection pipe.

On the side plate of the connecting jig, there are three drill holes for screwing fixing anchors for fixing the jig to the precast concrete slab, and three for the edge jig and three for the corner jig. In addition to being formed in two places, the holes for connecting bolts and nuts for connecting the plates at the time of plate installation are located in one place in the edge jig and in two places in the corner jig. It is shaped. The connecting bolt and nut holes are formed with some flexibility in the vertical and horizontal directions for adjustment when connecting the plates.

When manufacturing the precast concrete slab, this connecting jig is placed at a predetermined position of the form frame of the slab in a state where the fixing anchor is screwed, and is embedded and fixed in the concrete. The connection jigs are placed at the required locations of the concrete slab in consideration of hoisting the plate, height adjustment during installation, filling gaps with fast-setting cement grout filler, and connection between the plates.

After the precast concrete slab is completely hardened and the prescribed curing is completed, eye bolts for moving and laying the slab are screwed into the drilled holes formed at the bottom of this jig for lifting work. Be served. In paving work, after laying a plate on a specified base surface, unscrew the eye bolts used for lifting work from the jig, screw the height adjustment bolts into the same hole, and adjoin the plate. The gap between the plate and the foundation is secured by matching the heights of the upper surfaces of the above, and then the quick-hardening cement grout filler is injected from the hole formed in the bottom of the connecting jig. At this time, a thin iron plate or the like is laid in advance on the base portion to which the height adjusting bolt comes into contact so that the bolt does not sink into the base.

After that, the connection bolts and nuts are inserted into the connection holes of the respective plates and tightened to be connected. When all the plates are connected, the filling material of the quick-setting cement mortar or the quick-setting cement concrete is filled in the box-shaped connecting jig up to the height of the concrete plate to uniformly form the surface.

In the case where the plate is small and the number of places where the connecting jig is installed is small, the inside of the height adjusting bolt is formed in a hollow shape, and the discharge port for the fast-setting cement grout filler is provided in the lower part. With such a structure, it is possible to use a height adjusting bolt with a discharge port that has a function of injecting the filling material downward.

[0025]

EXAMPLE An example of a connecting jig for a precast concrete slab made of a PS plate or an RC plate according to the present invention will be described with reference to the accompanying drawings. The connecting jig described below is for paving. It is intended to be used for precast concrete slabs.

The following Tables 1 to 3 show "mixture of cement concrete for precast concrete plate", "mixture of fast-setting cement grout filler" and "mixture of fast-setting cement mortar" used in this example. Is shown.

FIG. 1 is a plan view of a precast concrete slab which is used for road paving and comprises a PS slab equipped with connecting jigs at the corners and edges, but the same applies to the RC slab. . The precast concrete slab shown in this figure is 1.75m wide, 5m long and 0.15m thick.
The lane width for one lane is 3.5 m by making two lanes in parallel with each other. The pre-cast concrete slab has 12 outer peripheral edges provided with connecting jig bodies 1 shown in FIG.
A plate height adjusting bolt 5 is screwed on the bottom plate of the connecting jig main body 1 which is arranged at four corners of four positions of the twelve positions and two edges of the central portion. The quick-setting cement grout filler is injected from the combined position indicated by the symbol b.

FIG. 2 is a sectional view of the jig showing that the precast concrete slabs connected by the connecting jig are being adjusted by the height adjusting bolts 5, and FIG. 3 is a precast connecting by the connecting jig. After the cement grout filler 7 is injected from the jig bottom plate to fill and fix the gap created by the concrete slab and the foundation, the interior space of the connecting jig is filled with the quick-hardening cement mortar 9 FIG.

In FIG. 2, a box-shaped connecting jig body 1 is provided.
Is formed with a screw hole 5a into which the height adjusting bolt 5 is screwed, and the side plate of this jig is provided with a fixing anchor indicated by reference numeral 2 for fixing the jig to the plate. A connecting bolt shown by reference numeral 3 is formed at three positions when the corresponding drill holes 2a are used at the edge portion and at two positions when used for the corner portion, and which connects the plates. When the nut connecting hole is used at the edge portion, it is formed at one place, and when it is used at the corner portion, it is formed at two places.

In FIG. 3, grout filler is injected into the bottom plate of the box-shaped connecting jig body 1 to form one injection hole for filling the gap between the plate and the base. The formation of the screw holes in the side plate of this jig is the same as that in FIG.

Although the plates are connected to each other by a box-shaped connecting jig, the connecting holes formed in the side plates of the connecting jig have a diameter larger than the outer diameter of the connecting bolts and nuts. It is perforated, and it is possible to adjust the level difference and the positional deviation that occur when the plates are connected.

4 to 5 are explanatory views in which the plane of the precast concrete slab on which the connecting jig is arranged are partially broken, and FIG. 4 shows the plane of the precast concrete slab on which the connecting jig is arranged on the edge. FIG. 5 is a plan view of the precast concrete slab in which the connecting jigs are arranged at the corners.

FIG. 6 is a plan view showing a second embodiment of a precast concrete slab equipped with connecting jigs at the corners used for pedestrian plaza pavement. In this second embodiment, the RC slab is used. However, it goes without saying that it can also be applied to the PS plate. In this figure, the precast concrete slab has a width of 2.0 m, a length of 2.0 m, and a thickness of 0.1 m.
It is manufactured to the dimensions of. Since the size of the plate is small and the load applied after the plate is in service is small, the connecting jigs indicated by reference numeral c are attached to the four corners of the plate.

Further, as shown in FIG. 7, the connecting jig c used a height adjusting pipe 15 with a grout material discharge hole instead of the height adjusting bolt 5.

FIG. 8A is a partially cutaway view showing the structure of the height adjusting pipe 15 with grout material discharge holes.
(B) is a cross-sectional view taken along the line of (A). As described above, by using the hollow height adjusting pipe with grout material discharge hole 15 as a height adjusting pipe for injecting a filler in a jig for connecting corners or edges, the plate is lifted, installed, All operations including height adjustment during installation, plate connection, and grout material injection work can be performed with the same connecting jig.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

As described above, the connecting jig for precast concrete slabs of the present invention has the following effects.

By using the precast concrete slab connecting jig of the present invention, the production of the precast concrete slab, the lifting movement, the height adjustment, the connection of the slabs, and the grout material for the gap between the stencil and the foundation are performed. The effect of facilitating the work such as filling, and in addition, after the road pavement is in service, if the plate is damaged and needs to be replaced, only the target plate can be replaced within a short time. Play.

Furthermore, since anchor bolts for use in hoisting for manufacturing and laying are not embedded in the plate and no perforation treatment is performed inside the plate, no defect portion relating to the strength of the plate is caused by these treatments. It also has the effect of.

[Brief description of the drawings]

FIG. 1 is a plan view of a precast concrete slab used for road paving and equipped with connecting jigs at corners and edges.

FIG. 2 is a sectional view of a jig showing that the height of a precast concrete slab connected by a connecting jig is being adjusted by a height adjusting bolt.

[Fig. 3] Fig. 3 is a jig showing a state in which a filling material such as grout material is injected from a jig bottom plate to fill and fix a gap generated between a lower surface of a precast concrete slab connected by a connecting jig and a base. FIG.

FIG. 4 is a plan view of a precast concrete slab in which a connecting jig is arranged at an edge portion.

FIG. 5 is a plan view of a precast concrete slab in which a connecting jig is arranged at a corner.

FIG. 6 is a plan view of a precast concrete slab equipped with a connecting jig at a corner used for pedestrian plaza paving.

FIG. 7 is an explanatory view showing a state in which a height adjusting pipe with a grout material discharge hole is screwed into a bottom plate of a jig.

FIG. 8A is a partially cutaway side view showing the structure of a height adjusting pipe with grout material discharge holes,
(B) is sectional drawing in the cross section of the (A) roll line.

FIG. 9 is an explanatory view of a cross-sectional portion of a connecting portion that connects PS plates by a horn joint method.

FIG. 10 is an explanatory cross-sectional view of a connecting portion that connects PS plates by a slip bar joint method.

11A is a partially cutaway cross-sectional view of a connecting portion that connects the plates by the RC plate joint method, and FIG. 11B is a cross-sectional view taken along the line EE of FIG. 11A.

[Explanation of symbols]

1 Connection jig body 2 Fixing anchor (M14) 2a Drilling hole 3 Connection bolt (M14) and nut 4 Connection hole 5 Height adjusting bolt (M20) 5a Screw hole 6 Supporting iron plate 7 Quick-hardening cement Grout filler 8 Bonding surface 9 Fast-setting cement mortar 10 Base 15 Grout material Height adjustment pipe with discharge hole 16 Discharge hole (Opening width 10 mm, Opening height 15 mm) 30 Horn pipe 31 Spiral rebar 32 Slip bar (steel, Diameter 25mm, length 700
mm) 33 Anticorrosive coating treatment 34 Trace filling material 35 Joints 40 Cylindrical hollow tube 41 Compressed air supply port and mortar injection port 41a Compressed air discharge port 42 Insertion hole 43 Filler injection port 44 Slip bar (made of steel , Diameter 25mm, length 500
mm) 45 Filler such as fast-setting cement concrete 50 Concave groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Igarashi 3-13-1, Kyobashi, Chuo-ku, Tokyo Yuraku Building Taisei Rotec Co., Ltd. (72) Inventor Mandai Fukuda 3-13, Kyobashi, Chuo-ku, Tokyo No. 1 Yuraku Building Taisei Rotek Co., Ltd.

Claims (2)

[Claims] 1. A box-shaped connecting jig arranged at corners or corners and edges of a precast concrete slab for road paving, wherein a side plate of the connecting jig is fixed to the precast concrete slab. A fixing anchor is provided for this purpose, and a perforation hole for connecting to another plate is provided.The bottom plate of this connecting jig is used for moving the plate and between the plate and the base. A jig for connecting precast concrete slabs, characterized by having a screw hole for adjusting the height of a gap to be generated and filling a filler in the gap. 2. The precast concrete slab according to claim 1, characterized in that the height of the slab is adjusted, and the inside of the slab has a hollow structure, and a discharge port of the filler is formed at an end thereof. Height adjusting pipe for filling filling material used for connecting jig.