JP5339457B2 - Concrete box for propulsion method with rectangular cross section - Google Patents

Description

  The present invention relates to a propulsion method using a concrete box having a rectangular cross section as a propulsion pipe. Specifically, when the concrete box passes through a curved hole, the space between the front and rear concrete boxes depends on the curve radius. The present invention relates to a technique that requires a seam to be opened to a design opening size and can easily follow an excavator that has undergone direction correction.

  Conventionally, a concrete box used in the propulsion method is attached with a collar covering the seam between the front and rear concrete boxes on one outer periphery, and closely attached to the other front and rear collars on the other outer periphery. It is common to install a packing that allows water to bend and to bend vertically and horizontally while adapting to the conditions of road alignment and underground objects, while maintaining water-stopping properties. A plurality of concrete boxes following the hole can follow the seam while opening the seam.

  By the way, the packing is provided with the highest priority on water-stopping, and when the concrete box is connected to the front and back, the packing is already compressed by about 70 to 50%, and considerable internal stress is generated. If it is attempted to bend in this state, depending on the composite curve, the joint may not be able to follow the excavator because the joint does not open to the design opening size due to the frictional resistance between the collar and the packing.

  In such a case, a claw arrow or the like (only flat) is pushed into the joint to forcibly open it, or an opening operation is performed using a claw jack, but this method causes a surface chip at the end of the concrete. After the completion of the construction work, it took time to repair the mortar, which could affect the concrete strength.

JP 2009-35968 A

The problem to be solved by the present invention is to solve these conventional problems, and when the concrete box passes through the curved hole, the seam does not open to the design opening size without damaging the concrete. An object of the present invention is to provide a concrete box for a propulsion method having a rectangular cross section that can easily follow an excavator according to the shape of a line by opening a seam.

The configuration of the present invention that solves this problem is as follows.
1) A collar that covers the joint between the front and rear concrete boxes is attached to one outer peripheral edge of a concrete box with a rectangular cross-section used as a propelling pipe in the propulsion method, and the color of another front and rear concrete box is attached to the other outer peripheral edge. In a concrete box for propulsion method with a packing that seals water tightly with the concrete box, the inside of the concrete box is open on the inside and the outside of the concrete box on the top, bottom, left and right end faces before and after the concrete box. Provided with a plurality of recesses that leave the concrete cover part of the box, and arranged so that the recessed parts provided on the upper, lower, left and right end faces of the facing concrete box face each other. Make it possible to place jacks in the recesses on the opposite top, bottom, left, and right end faces, and use a metal reinforcing plate for the recesses in the concrete box. Mightier, further a reinforcing bar and said reinforcing plate is Haisuji in the concrete of the concrete a box body linked by welding through the auxiliary reinforcement, in concrete a box body <br/> for rectangular section jacking method.

According to the onset bright, when the seam between the front and rear of the concrete box-body not open to a predetermined opening size, between the front and rear of the concave portion of the right or left in a plane curve, between the front and rear of the recess of the upper or lower side in the vertical curve When the jack is placed and extended, the front and rear concrete boxes are pressed away from each other and the seam is opened, and the front and rear concrete boxes are bent to follow the excavator. Therefore, there is no need to forcibly open it with the use of a threaded arrow or the like as in the prior art, so there is no chipping of the surface of the concrete, and repair work by mortar finishing after construction is unnecessary, and concrete There is no effect on the strength of the film.

In addition , the reinforcing plate receives the force of the jack on the surface so that it is not locally applied to the concrete of the concrete box, and the occurrence of cracks in the concrete is prevented.

Further , the force acting on the reinforcing plate when the jack is extended is distributed to the reinforcing bars in the concrete via the auxiliary reinforcing bars, so that the concentration of the load on the reinforcing plate is reduced and the strength of the concrete can be maintained.

It is a perspective view by the side of packing of the concrete box of an example. It is a front view by the side of the color of the concrete box of an example. It is a longitudinal cross-sectional view of the joint part of the concrete box of an Example. It is an expanded sectional view of the recessed part of an Example. It is explanatory drawing which shows the bending of the concrete box of an Example. It is a front view by the side of the color of the concrete box of other examples of an example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described based on examples and drawings.

  FIG. 1 is a perspective view of the packing side of the concrete box of the embodiment, FIG. 2 is a front view of the collar side of the concrete box of the embodiment, and FIG. 3 is a longitudinal sectional view of a joint portion of the concrete box of the embodiment. 4 is an enlarged cross-sectional view of the concave portion of the embodiment, FIG. 5 is an explanatory view showing bending of the concrete box of the embodiment, and FIG. 6 is a front view of the color side of the concrete box of another example of the embodiment.

  In the figure, 1 is a concrete box, 1a is a reinforcing bar, 2 is a collar, 3 is a packing, 4 is a recess, 5 is a reinforcing plate, 5a is an auxiliary reinforcing bar, 6 is a jack, and 7 is a cushioning material.

  The concrete box 1 of this embodiment has a rectangular cross section as shown in FIGS. 1 to 4, a steel collar 2 is attached to the outer periphery of one connection end, and the outer periphery of the other connection end is reduced. The packing 3 is attached in a double diameter, and the packing 3 side can be inserted and connected to the collar 2 side.

  Three concave portions 4 are formed on the top, bottom, left, and right end surfaces of the front and rear of the concrete box 1, and a metal reinforcing plate 5 having a concave cross section is attached to the concave portion 4. The inner space side of the recess 4 is open, and the jack 6 can be taken in and out from the inner space side. Auxiliary reinforcing bars 5a are welded to the back surface of the reinforcing plate 5 in a bowl shape and welded to the reinforcing bars 1a arranged in the concrete of the concrete box 1. The formation of the recess 4, the attachment of the reinforcing plate 5, and the welding of the auxiliary reinforcing bar 5 a and the reinforcing bar 1 a are performed simultaneously with the production of the concrete box 1. The jack 6 uses a manual hydraulic bean jack.

  Cushioning material 7 is attached to the upper, lower, left and right end faces of the concrete box 1 on the collar 2 side. The cushion material 7 is provided so that the load at the time of propulsion is dispersed so that the concrete does not crack. The concave portions 4 of the concrete box 1 are not limited to three places, and may be formed at four places or five places according to the size of the concrete box 1. Moreover, it does not provide at a plurality of locations, and may be provided in a continuous groove shape as shown in FIG. 6 so that an arbitrary number of jacks 6 can be arranged at an arbitrary position.

  In the present embodiment, for example, when passing through a flat curved hole that is bent to the right by the excavator, the seam may not be opened to the design opening size due to the frictional resistance between the collar 2 and the packing 3. In this case, as shown in FIG. 5, when the jack 6 is disposed between the left and right front and rear recesses 4 and extended, the front and rear concrete boxes 1 are pressed away from each other, and the left seam is opened. The box 1 bends to the right.

  At this time, since the reinforcing plate 5 receives the force of the jack 6 by the surface, it is not locally applied to the concrete, and the occurrence of cracks in the concrete is prevented. Further, since the force acting on the reinforcing plate 5 when the jack 6 is extended is distributed to the reinforcing bars 1a in the concrete, the concentration of the load on the reinforcing plate 5 is reduced and the strength of the concrete can be maintained.

  When the opening size that can follow the excavator is opened, the extended jack 6 is retracted and removed from the recess 4. If the seam does not open when passing through the longitudinally cut hole, the upper or lower seam can be opened and bent by placing and extending the jack 6 between the upper and lower front and rear recesses 4.

  As described above, according to the present embodiment, since the seam can be opened without using an arrow or the like as in the prior art, the surface chipping of the concrete end portion does not occur, and the construction is completed. Finishing can be done at a low cost by finishing with a simple filling operation by mortar finishing later.

  The technology of the present invention is used in construction for constructing a rectangular cross section waterway, a humanitarian underground passage, and a common groove by a propulsion method.

DESCRIPTION OF SYMBOLS 1 Concrete box 1a Reinforcement 2 Color 3 Packing 4 Recess 5 Reinforcement plate 5a Auxiliary rebar 6 Jack 7 Cushion material

Claims (1)

A collar covering the joint between the front and rear concrete boxes is attached to one outer peripheral edge of a concrete box with a rectangular cross-section used as a propelling pipe in the propulsion method, and the other outer peripheral edge is in close contact with the collar of another front and rear concrete box In the concrete box for the propulsion method with a packing that stops water, the inside of the concrete box is open at the top, bottom, left, and right end faces before and after the concrete box so as to communicate with the space inside the concrete box, and the concrete box on the outside Provided with a plurality of recesses where the concrete covering part of the concrete remains, and is provided so that the recesses provided on the upper, lower, left and right end faces of the facing concrete box face each other, and the front and rear concrete boxes face each other Enables jacks to be placed in the recesses on the top, bottom, left, and right end surfaces, and reinforces the recesses in the concrete box with metal reinforcement plates Was ligated to further welded through the auxiliary reinforcement and reinforcement and the reinforcing plate is Haisuji in the concrete of the concrete a box body, a rectangular cross section of the jacking method for concrete box making bodies.

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