JP4707004B2 - Horizontal joint type concrete plate connecting method and connecting structure thereof - Google Patents

Description

 TECHNICAL FIELD The present invention relates to a horizontal joint type concrete plate connecting method and a connecting structure for connecting by placing a horizontal connecting steel rod between concrete plates made of cast-in-place or precast concrete.

Conventionally, a horizontal joint type connection structure is known as a connection structure between cast-in-place or precast concrete plates in concrete pavement or the like. In this connection structure, connecting steel rod insertion holes are formed opposite to each other between the adjacent concrete plates, while the connecting steel rod insertion holes of the concrete plate are formed to a length that accommodates the entire length of the connecting steel rods. Then, the other concrete plate is joined in a state in which the connecting steel bar is accommodated therein, and then the connecting steel rod is connected to the other concrete plate by using connecting steel rod sliding means such as air pressure or operation wire. The two steel plates are connected to each other by filling the gap between the connecting steel rod and the connecting steel rod insertion hole with a hardened grout. Methods are known (Patent Documents 1, 2, and 3).
Japanese Patent Publication No. 04-028845 JP 07-197406 A JP 07-279111 A

 Conventionally, a connecting steel rod insertion hole of a concrete plate is often formed by using a cylindrical discarded mold formed by processing a steel pipe manufactured as a gas pipe. Specifically, as shown in FIG. 8, after providing a reinforcing spiral streak 82 to surround a cylindrical discarded form frame 81 in which a steel pipe is processed, the concrete 83 is embedded by embedding them. A concrete plate 80 having a connecting steel rod insertion hole 84 is formed. The concrete plate 80 is provided with vent holes 85, 86 communicating with the connecting steel rod insertion hole 84, and the connecting steel rod 87 is accommodated in the connecting steel rod insertion hole 84.

 In such a conventional concrete plate connecting structure, the cost for forming the connecting steel rod insertion hole, such as processing and bar arrangement of spiral bars, is about 15% of the manufacturing cost of the entire concrete plate, which is expensive. It is a big cause.

 Also, when a large number of concrete plates are connected and used for paving, etc., if some of the concrete plates are damaged, partly separate the concrete plates from the surrounding concrete plates. It is necessary to remove and install a new concrete plate. In this case, the joint portion of adjacent concrete plates is cut off, the damaged concrete plate is removed and replaced with a new concrete plate. It is necessary to form a connecting steel rod insertion hole again in an existing concrete plate that is not replaced.

 For that purpose, core drilling is performed to remove the connecting steel rod, grout material and discarded mold frame part embedded in the concrete plate that is not replaced, and the steel pipe that was discarded as the core drilled hole, and The bar arrangement around the steel pipe becomes an obstacle to the drilling, and it becomes difficult to re-mold the connecting steel rod insertion hole, resulting in a problem that the replacement work is costly and takes time.

 An object of the present invention is to solve the conventional problems as described above, and when a connecting steel rod insertion hole is easily formed at a low cost and one of the connected concrete plates is replaced. Further, the present invention provides a horizontal joint type concrete plate connecting method and its connecting structure capable of easily performing the operation for reconnection.

The invention described in claim 1 for solving the above-mentioned conventional problems and achieving the intended purpose is to provide a concrete plate made of cast-in-place or precast concrete to be joined to each other, and each joining surface of both concrete plates. The connecting steel rod insertion hole is opened, the both connecting steel rod insertion holes are communicated, and the two concrete plates are joined in a state where the connecting steel rod is inserted into one of the connecting steel rod insertion holes, By moving the connecting steel rod to the other connecting steel rod insertion hole side, the connecting steel rod is positioned across the two concrete plates, and then the grout is filled in the connecting steel rod insertion holes. In the connecting method of a horizontal joint type concrete plate in which the connecting steel rods are embedded and fixed in the both connecting steel rod insertion holes and the two concrete plates are connected, the concrete plates to be connected to each other The sintered steel rod insertion hole with molding using punching die of concrete after casting can be withdrawn to the cylindrical form of the concrete panel, within said concrete opening of each connecting steel rod insertion hole, the connecting steel bars A short cylindrical opening reinforcing tube is embedded so as to surround the opening of the insertion hole .

 According to a second aspect of the present invention, in addition to the structure of the first aspect, the punching die expands so that an outer peripheral surface has a predetermined cylindrical shape by injecting a fluid therein, and The purpose of the present invention is to use an expansion / contraction-type punch that is reduced in diameter to a shape that can be removed by removing the fluid.

 According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the connecting steel rod insertion hole of the concrete plate on which the connecting steel rod has been previously inserted has air connected to the rear portion. A vent hole for injection and a vent hole for deaeration communicating with the middle of the connecting steel rod insertion hole are provided, and the concrete plate on the side where the connecting steel rod is inserted communicates with the connecting steel rod insertion hole. The connecting steel rod is moved from one connecting steel rod inserting hole to the other connecting steel rod inserting hole side by injecting pressurized air from the air injecting vent hole, and thereafter Injecting grout using the vents.

  According to a fourth aspect of the present invention, a cast-in-place or precast concrete concrete plate to be joined to each other includes a connecting steel rod insertion hole opened in each joint surface of both concrete plates, and the both connecting steel rods. The connecting steel rod is inserted into the insertion hole at a position straddling the concrete plate, the grout is filled in the both connecting steel rod insertion holes, and the connecting steel rod is inserted into the both connecting steel rod insertion holes. In the connecting structure of horizontal joint type concrete plates embedded in and fixed to each other, the connecting steel rod insertion holes of the concrete plates to be connected to each other are molded in a state in which the concrete of the concrete plate frame is exposed on the inner peripheral surface. In addition, a short cylindrical opening reinforcing tube is embedded in the concrete of the opening portion of the joint surface of the connecting steel rod insertion hole so as to surround the opening portion of the connecting steel rod insertion hole. That.

  According to a fifth aspect of the present invention, in addition to the structure of the fifth aspect, an anchor bar is arranged on the outer periphery of the opening portion reinforcing pipe, and the anchor bar is embedded in a concrete plate.

  According to the connecting method and the connecting structure of the horizontal joint type concrete plate of the present invention, a reinforcing bar for reinforcing the concrete of the connecting steel rod insertion hole molding part such as a spiral bar is not used as in the prior art. In addition, without using a metal cylinder for the connecting steel rod insertion hole, the connecting steel rod insertion hole of each concrete plate is molded using a cylindrical punching die that can be extracted after placing the concrete plate into the concrete. By doing so, it is easy to form the connecting steel rod insertion hole, and the manufacturing cost can be greatly reduced.

  In addition, when a part of the concrete plate is replaced with a new concrete plate, the connection steel rod insertion hole for the remaining existing concrete plate can be easily regenerated by drilling with a core cutter. The replacement work can be completed in a shorter time and at a lower cost than in the past.

  Further, in the present invention, a short cylindrical opening reinforcing tube is embedded in the concrete of the opening portion of each connecting steel rod insertion hole so as to surround the opening portion of the connecting steel rod insertion hole. Since the steel bars can be sufficiently reinforced without embedding reinforcing bars such as spiral bars or hoop bars to reinforce the concrete in the connecting hole forming part of the conventional connecting steel bar, the connecting steel bars are cheap and have good workability. The insertion hole can be molded, and the manufacturing cost can be reduced.

  Furthermore, in the present invention, the die is expanded so that the outer peripheral surface has a predetermined cylindrical shape by injecting a fluid therein, and the diameter is reduced to a shape that can be removed by extracting the internal fluid. By using the compression die, the structure of the die is simple, its manufacture is easy, and the connecting steel rod insertion hole portion can be molded at a low cost.

  Furthermore, in the present invention, anchor bars are arranged on the outer periphery of the opening reinforcing pipe, and the anchor bars are embedded in the concrete plate, so that the upper and lower portions generated in the joint surface portion of the concrete plate via the opening reinforcing pipe are provided. The shearing force in the direction becomes the tensile force of the anchor bars, local stress concentration on the concrete is avoided, cracks can be prevented from occurring on the end face of the concrete plate, and the yield strength of the end face of the concrete plate is enhanced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a pavement plate in which a connection structure according to the present invention is implemented, and FIG. FIG. 3 is an external perspective view showing a mold for forming a connecting steel rod insertion hole of the other concrete plate B constituting the pavement plate shown in FIG. Hereinafter, the concrete plate on the side in which the connecting steel rod is previously accommodated in the connecting steel rod insertion hole is referred to as a male side concrete plate A, and the concrete plate on the side receiving the connecting steel rod is referred to as a female side concrete plate B.
[Concrete plate connection structure]
As shown in the figure, the concrete plate of the present invention has a structure in which an adjacent male side concrete plate A and a female side concrete plate B are connected to each other with their side ends abutting each other. The side concrete plate B is joined via a packing 18. The concrete plates A and B are respectively provided with connecting steel rod insertion holes 10 and 20 extending laterally, and the connecting steel rod insertion holes 10 and 20 are open to the end faces of the concrete plates A and B, respectively. Yes. The opening diameter of the connecting steel rod insertion hole 20 of the female concrete plate B is slightly larger than the opening diameter of the connecting steel rod insertion hole 10 of the male concrete plate A so that the connecting steel rod can be smoothly inserted. Has been.

  Further, in the illustrated example, opening reinforcing pipes 11 and 21 each having a short cylindrical shape are provided at end opening portions of the connecting steel rod insertion holes 10 and 20. The opening reinforcement pipes 11 and 21 are embedded in the end face of the concrete plate so as to surround the opening portions of the connecting steel rod insertion holes 10 and 20. Anchor portions 11a, 11a, 21a, and 21a are fixed to the opening portion reinforcing pipes 11 and 21 in a state where the center portions thereof are circumferentially aligned with the outer periphery of the opening portion reinforcing pipes 11 and 21, respectively. The tip is embedded in the concrete slabs A and B.

  In addition, it is preferable that the aperture diameter of the opening part reinforcement pipes 11 and 21 is moderately larger than the aperture diameter of the connecting steel rod insertion holes 10 and 20. If the diameter of the opening reinforcing tube is moderately large, the core hole can be smoothly drilled without causing any obstacle when the existing connecting steel rod insertion hole of the concrete plate is core drilled. Further, the structure is such that the end strength after reconnection does not change.

  Inside the connecting steel rod insertion hole 10 of the male side concrete plate A, a rod-shaped connecting steel rod 30 is movably inserted. The connecting steel rod insertion hole 10 of the male side concrete plate A has a length that accommodates the entire length of the connecting steel rod 30, while the connecting steel rod insertion hole 20 of the female side concrete plate B has the length of the connecting steel rod 30. It may be about half the length.

  A vent hole 12 for injecting air is provided in the rear part of the connecting steel rod insertion hole 10 of the male side concrete plate A, and a vent hole 13 for deaeration is provided in the middle of the connecting steel rod insertion hole 10. Yes. These vent holes 12 and 13 communicate with the connecting steel rod insertion hole 10, compressed air is injected into the connecting steel rod insertion hole 10 through the vent hole 12, and the internally connected connecting steel rod 30 is caused by the compressed air. Extruded. At this time, excess compressed air is deaerated through the vent hole 13.

  On the other hand, a vent hole 22 is provided in the connecting steel rod insertion hole 20 of the female concrete plate B. The grout 26 is injected into the inside of the connecting steel rod insertion holes 10 and 20 by using the ventilation hole 22 and the ventilation holes 12 and 13 of the male side concrete plate A as appropriate, and the connecting steel rod insertion hole 10, 20 is filled.

  In the example shown in the figure, the opening reinforcement pipes 14 and 15 are provided in the vent holes 12 and 13 of the male concrete plate A, and the opening reinforcement pipe 23 is provided in the ventilation hole 22 of the female concrete plate B. Yes. The opening reinforcing pipes 14, 15, 23 are embedded in the concrete plate so as to surround the connecting steel rod insertion holes 10, 20.

  After the male concrete plate A and the female concrete plate B having the above structure are installed side by side, compressed air is blown into the connecting steel rod insertion hole 10 through the ventilation holes 12 of the male concrete plate A, and the connecting steel rod insertion hole The connecting steel rod 30 housed in 10 is pushed out by this compressed air and inserted into the connecting steel rod insertion hole 20 of the adjacent female-side concrete plate B.

Since the length of the connecting steel rod insertion hole 20 is about half that of the connecting steel rod 30, both sides of the connecting steel rod 30 are connected to the connecting steel rod insertion hole 10 of the male concrete plate A and the female concrete plate B. Each steel rod insertion hole 20 is inserted. In this state, the grout 26 is injected into the connecting steel rod insertion holes 10 and 20 by appropriately using the vent holes 22 of the female concrete plate B and the vent holes 12 and 13 of the male concrete plate A, and the gaps in the holes are injected. Is filled with grout 26. The grout 26 is solidified inside the concrete plate, and the connecting steel rod 30 is fixed inside the concrete plate.
[Production of concrete plate]
The above-described connecting steel rod insertion holes 10 and 20 of the male concrete plate A and the female concrete plate B are formed using a cylindrical punching die that can be pulled out after the concrete is placed. As this punching die, the expansion and contraction type punching that expands so that the outer peripheral surface becomes a predetermined cylindrical shape by injecting a fluid into the inside and is reduced to a shape that can be removed by pulling out the fluid inside. A mold is preferably used, and in this embodiment, a flexible tube punch 16 is used.

  FIG. 2 shows an example of the flexible tube punching die 16 used for the male concrete plate A, and FIG. 3 shows an example of the flexible tube punching die 24 used for the female concrete plate B. These flexible tube extraction dies 16 and 24 are extendable molds formed in a cylindrical shape by a flexible material such as rubber or elastic fabric, and fluid (water or air) is injected under pressure into the inside. And used in a state of being expanded into a cylindrical shape. The flexible tube punching die 16 shown in the figure is provided with opening reinforcement tubes 14 and 15 at the vent holes 12 and 13, and the flexible tube punching die 24 is provided with an opening reinforcement at the vent hole 22 portion. A tube 23 is provided.

  The production procedure of a concrete plate using the flexible tube punching dies 16 and 24 is shown in FIGS. As shown in FIG. 4, when the male side concrete plate A is manufactured, the flexible tube punching die 16 shown in FIG. 2 is used, and the flexible tube punching die 16 is directed so that the vent holes 12, 13 face downward. Is placed on the production form 40. The base end portion 17 of the flexible tube punching die 16 protrudes outward from the side frame 41 of the production mold 40 and is connected to an external pressure device (not shown).

  This pressurizing device feeds compressed air into the flexible tube punching die 16 to keep the flexible tube punching die 16 in an expanded state. Next, concrete for molding a concrete plate frame is placed around it and cured to produce a male side concrete plate A. In the concrete plate, a flexible tube punching die 16 is formed in an expanded shape, and a connecting steel rod insertion hole 10 in a state where the concrete of the concrete plate casing is exposed is formed on the inner peripheral surface. If the pressure of the flexible tube punching die 16 is released after the concrete is hardened, the flexible tube punching die 16 can be easily shrunk and taken out from the inside of the concrete plate.

As shown in FIG. 5, when producing the female-side concrete plate B, the flexible tube punching die 24 shown in FIG. 3 is used, and in the other cases, as in FIG. 4, the vent hole 22 faces downward. The flexible tube punching die 24 is installed in the production mold 40. A compressed air is sent from the base end portion 25 protruding from the side frame 41 of the production mold 40 to the flexible tube punching mold 24 to keep it in an expanded state, and concrete for molding a concrete plate frame is placed around it. Curing and producing female side concrete plate B. In the concrete plate, a flexible tube punching die 24 is formed in an expanded shape, and a connecting steel rod insertion hole 20 in a state where the concrete of the concrete plate casing is exposed is formed on the inner peripheral surface.
[Replacement of concrete plate]
About the concrete plate | board of this invention, the point to replace | exchange the connected concrete plate | board is shown in FIG. 6, FIG. As shown in the drawing, the joint joint portion of the adjacent concrete plates 61 and 62 is cut to separate one concrete plate 61 (FIG. 6 [A]). Next, the remaining concrete slab 62 is drilled along the existing connecting steel rod insertion hole 63 using the core cutter 70 to remove the existing connecting steel rod 64 and grout 65, and a new connecting steel rod is inserted. The hole 71 is formed (FIG. 6 [B]).

  Furthermore, a vent hole 72 communicating with the middle of the connecting steel rod insertion hole 71 and a vent hole 73 communicating with the rear portion of the connecting steel rod insertion hole 71 are drilled by a drill 74 (FIG. 6 [C]). A new connecting steel rod 75 is inserted into the drilled connecting steel rod insertion hole 71 to form a male side concrete plate A (FIG. 7D).

  Next, a new female concrete plate B having a connecting steel rod insertion hole 76 is installed, compressed air is injected into the hole from the vent hole 73 of the male concrete plate A, and the connecting steel rod 75 is pushed out. One side portion of the connecting steel rod 75 is inserted into the connecting steel rod insertion hole 76 of the new female concrete plate B, and both sides of the connecting steel rod 75 are respectively inserted into the connecting steel rod insertion holes of the concrete plate A and the concrete plate B. (Fig. 7 [e]).

  Next, the grout 78 is injected through the air holes 77, the air holes 72 and 73 of the concrete plate B, and the gaps in the holes are filled. Further, the air holes 77 and the air holes 72 and 73 are sealed with an epoxy mortar resin or the like (FIG. 7 [F]).

  In the above example, the new concrete plate to be replaced is a female concrete plate. However, the new concrete plate is a male concrete plate and the existing concrete plate is a female concrete plate. The insertion holes 71 and 76 may be formed in a concrete plate opposite to the above.

It is sectional drawing of the pavement plate which has a connection structure concerning this invention. It is an external appearance perspective view of the flexible tube cutting die part which forms the connection steel bar insertion hole of the male side concrete plate in this invention method. It is an external appearance perspective view of the flexible tube cutting die part which forms the connection steel rod insertion hole of the female side concrete plate in this invention method. It is sectional drawing of the manufacturing apparatus of the male side concrete board in this invention. It is sectional drawing of the manufacturing apparatus of the female side concrete plate in this invention. It is process drawing which shows the replacement | exchange operation | work of the concrete plate in the connection structure which concerns on this invention. It is process drawing which shows the replacement | exchange operation | work of the concrete plate in the connection structure which concerns on this invention. It is sectional drawing of the pavement plate which has the conventional connection structure.

A-male concrete plate B-female concrete plate 10-connected steel rod insertion hole 11-opening reinforcing tube 11a-anchor bar 12-ventilating hole 13-venting hole 14-opening reinforcing tube 15-opening reinforcing tube 16 -Flexible tube punching die 17 for male side-Base end 18-Packing 20-Connecting steel rod insertion hole 21-Opening reinforcing tube 21a-Anchor bar 22-Vent hole 23-Opening reinforcing tube 24-Female side Flexible tube punching die 25-proximal end portion 26-grout 30-connecting steel rod 40-manufacturing mold frame 41-side frame 61-existing concrete plate 62-existing concrete plate 63-existing connecting steel rod insertion hole 64- Existing connecting steel bar 65-Existing grout 70-Core cutter 71-Connecting steel bar insertion hole 72-Vent hole 73-Vent hole 74-Drill 75-Newly connected steel bar 76-Connected steel bar insertion hole 77-Vent hole 78-Grout 80-Concree Edition 81- tubular formwork 82- spiral muscle 83 - Concrete 84- connecting steel rod insertion hole 85 to vent X86- vents 87 - connecting steel bars

Claims (5)

In a concrete plate made of cast-in-place or precast concrete to be joined to each other, a connecting steel rod insertion hole is opened in each joining surface of both concrete plates, and the both connecting steel rod insertion holes are communicated with each other. The both concrete plates are joined in a state where the connecting steel rod is inserted into the connecting steel rod insertion hole, and the connecting steel rod is moved to the other connecting steel rod insertion hole side to move the connecting steel rod to the both concrete plates. And then the grout is filled in the both connecting steel rod insertion holes, and the connecting steel rods are buried and fixed in the both connecting steel rod insertion holes, and the two concrete plates are connected to each other. In the connection method of the joint type concrete plate,
The connecting steel rod insertion holes of the concrete plates to be connected to each other are molded using a cylindrical punching die that can be extracted after placing the concrete plate into the concrete, and the openings of the connecting steel rod insertion holes are formed. A method of connecting horizontal joint type concrete plates, characterized in that a short cylindrical opening reinforcing tube is embedded in the concrete so as to surround the opening portion of the connecting steel rod insertion hole .   The punching die expands so that the outer peripheral surface has a predetermined cylindrical shape by injecting fluid into the inside, and the expandable / shrinkable die is reduced in diameter to a shape that can be removed by pulling out the fluid inside. The method for connecting horizontal joint type concrete plates according to claim 1, wherein:   In the connecting steel rod insertion hole of the concrete plate on the side where the connecting steel rod is inserted in advance, a vent hole for air injection communicating with the rear portion and a deaeration for communicating between the connecting steel rod insertion hole are provided. A concrete hole on the side into which the connecting steel rod is inserted is provided with a vent hole communicating with the connecting steel rod insertion hole, and pressurized air is injected from the air injection vent hole. 3. The horizontal joint according to claim 1, wherein the connecting steel rod is moved from one connecting steel rod insertion hole to the other connecting steel rod insertion hole side, and then grout is injected using the vent hole. Method of connecting concrete plates. A concrete plate made of cast-in-place or precast concrete to be joined to each other is provided with a connecting steel rod insertion hole opened in each joining surface of both concrete plates, and the both ends of the connecting steel rod insertion hole straddle the concrete plate. A horizontal joint type concrete plate in which the connecting steel rod is inserted at the position, the grout is filled in the both connecting steel rod insertion holes, and the connecting steel rod is embedded and fixed in the both connecting steel rod insertion holes. In the connection structure of
The connecting steel rod insertion holes of the concrete plates to be connected to each other are formed in a state where the concrete of the concrete plate casing is exposed on the inner peripheral surface, and the openings of the joint surfaces of the connecting steel rod insertion holes are formed. A connecting structure of a horizontal joint type concrete plate in which a short cylindrical opening reinforcing pipe is embedded in concrete so as to surround the opening portion of the connecting steel rod insertion hole.   5. The joint structure of a horizontal joint type concrete plate according to claim 4, wherein an anchor bar is arranged on the outer periphery of the opening reinforcing pipe, and the anchor bar is embedded in the concrete plate.

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