JP3127038U - Box culvert - Google Patents

Abstract

An object of the present invention is to provide a box culvert that is compatible with reinforcing a joint and ensuring water-stopping performance and applicable to the Messel shield method.
A constraining ring body 20 provided by constraining a stepped outer peripheral surface 11b of an open end 11 of a box body 10 and a male joint 13 integrally formed with the open other end 12 of the box body 10 are provided. And a part of the constraining ring 20 is extended to form an extension 20b.
[Selection] Figure 1

Description

The present invention relates to a box culvert, and more particularly, to a box culvert that achieves both strengthening of joints and waterstop.

A concrete box culvert having a rectangular cross section has a male joint and a female joint constituting an inlay joint at both ends, and these joints are integrated with the box body when forming the box culvert. It is molded into.
In addition, an annular rubber sealing material is attached to the outer peripheral surface of the male joint to ensure the water stoppage of the joint (Japanese Patent Laid-Open No. 2003-247777, etc.).

  In general, a box culvert is laid through a groove opening operation using a backhoe, a laying operation in which a box culvert suspended in the groove is sequentially added to the tip of an existing box culvert, and a groove that has been laid is backfilled. ing.

There is also known a Messel shield construction method in which a reaction force is obtained from a laid box culvert and laid while digging a Messel shield machine.
The box culvert used in this type of construction method does not have a joint, and simply joins flat joining surfaces to each other.
In this way, the box culvert used for the application of the thrust reaction force attaches a sealing material to one of the joint surfaces, and tightens the joints between the plurality of box culverts with the PC material to prevent the joint from water-proofing. Therefore, there is a problem that the water-stopping cost is high.

  In addition, when the general box culvert that is not affected by the propulsion reaction force described above is applied to the Messel shield method, the joint becomes a weak point in strength, and the joint concrete frame is cracked or buckled. In order to apply the current box culvert to the propulsion method, several improvements are required.

The present invention has been made in view of the above points, and an object of the present invention is to provide a box culvert capable of achieving both enhancement of joints and securing of water stopping performance.
It is another object of the present invention to provide a box culvert that can be applied to the Messel shield method and the propulsion method, in which a large propulsion reaction force, which has been considered difficult to apply, is applied.

The first invention of the present application is a culvert box having a concrete box body having both ends opened, the restraint ring provided by restraining the stepped outer peripheral surface of the opened one end of the box body, and the box A male joint integrally formed at the other open end of the main body, and a part of the restraint ring is extended from the end surface of the box main body in parallel with the axis so that the restraint member and the female joint are combined. Provided is a culvert box characterized by forming a protruding portion.
The second device of the present application is characterized in that, in the first device, a water-swellable sealing material is interposed between the stepped outer peripheral surface of the open end of the box body and the restraint ring. Provide culvert box.
A third device of the present application provides a culvert box according to the second device, wherein a resin coating layer is additionally interposed between the outer peripheral surface of the step and the peripheral surface of the constraining ring.
The fourth device of the present application is the device according to any one of the first to third devices, wherein the open end and both end surfaces of the other end of the box main body are orthogonal to the axis of the box main body so that propulsive force can be transmitted. A culvert box is provided which is formed as a flat surface.
A fifth device of the present application provides a culvert box according to any one of the first to fourth devices, wherein an annular sealing material is attached to an outer peripheral surface of a step constituting the male joint.
A sixth device of the present application is the culvert according to any one of the first to fourth devices, wherein the sealing material constituting the male joint is attached to the inner peripheral surface of the extending portion of the restraint ring. Provide a box.
A seventh invention of the present application is the culvert according to any one of the first to sixth inventions, wherein the box body is composed of a plurality of divided bodies divided along a dividing line parallel to the axis. Provide a box.

The present invention has the following specific effects.
(1) The present invention constrains and provides a constraining ring on the stepped outer peripheral surface of one open end of the box body, and forms an extension portion on a part of the constraining ring.
Thereby, the open end of the box body becomes a composite structure of a hard material and concrete, and the strength against bending and buckling can be remarkably improved.
(2) Since the constraining ring body has both a function as a constraining member of the box body and a function as a female joint, it is possible to achieve an economical design by reducing the number of components.
(3) It is possible to provide a box culvert applicable to the Messel shield method and the propulsion method in which a large axial force acts.
(4) When a water-swellable sealing material is interposed between the stepped outer peripheral surface of the open end of the box body and the constraining ring body, a good sealing property is imparted between the box body and the constraining ring body. be able to.
(5) When a resin coating layer is interposed between the outer peripheral surface of the step and the peripheral surface of the constraining ring, a sealing property between the box body and the constraining ring is further improved.
(6) The box body can be applied not only to a form in which the whole is integrally molded, but also to a structure composed of a plurality of divided bodies in consideration of transportability, and is versatile.

  Embodiments of the present invention will be described below with reference to the drawings.

(1) Outline of Calvert Box FIG. 1 is an overall perspective view of a culvert box 1 according to the present invention.
The culvert box 1 includes a concrete box body 10 having both ends opened, a constraining ring 20 provided at one open end 11 of the box body 10, and a male shape integrally formed with the other open end 12 of the box body 10. And a joint 13.

(2) Box body The box body 10 is a reinforced concrete box formed by, for example, a vibration compaction method using a formwork.
In this example, the case where the box body 10 has a square cross-sectional shape is shown, but the cross-sectional shape may be other shapes such as a rectangle and a circle.

(3) Restraint ring The end face 11a of the open one end 11 of the box body 10 is a plane that is orthogonal to the axis of the box body 10 because it serves as a propulsive force transmission surface.

The restraint ring 20 will be described with reference to FIG.
An annular constraining ring body 20 is a member that serves both as a restraining member of the box body 10 and a female joint, and is formed of a hard plate such as a steel plate.

  The outer peripheral surface of the open one end 11 of the box body 10 is recessed over a predetermined width along the axial direction from the end surface 11a. And is attached.

By covering the constraining ring body 20, the open end 11 of the box body 10 becomes a composite structure of hard material and concrete, and further, the constraining ring body 20 constrains the open end 11 of the box body 10, so that bending The strength against buckling is remarkably improved.
In other words, the strength of the open end 11 of the box body 10 can be increased simply by exteriorizing the constraining ring body 20, so that the amount of reinforcing bars, which is a conventional reinforcing method, can be increased, or the thickness of the concrete frame can be increased. It is not necessary to adopt an uneconomic design method.

A water-swellable sealing material 15 is attached to the step outer peripheral surface 11b to ensure a good sealing property between the proximal end portion 20a of the restraint ring 20 and the step outer peripheral surface 11b.
More preferably, the sealing performance between the constraining ring body 20 and the stepped outer peripheral surface 11b is further improved by combining the stepped outer peripheral surface 11b and the resin coating layer 16 interposed between the peripheral surfaces of the constraining ring body 20.

A part of the constraining ring body 20 that is externally mounted on the stepped outer peripheral surface 11b extends from the end surface 11a of the box body 10 in parallel with the axis to form an extending portion 20b.
The inner shape of the extending portion 20b has a shape that can be closely sheathed over the entire circumference of the male joint 13 to be described later, and the protruding length of the extending portion 20b does not exceed the protruding length of the male joint 13. To do.

Further, the installation time of the sealing material 15 and the constraining ring 20 may be retrofitted after the box body 10 is formed, in addition to the case where the box body 10 is integrally attached in advance when the box body 10 is formed.

(4) Male Joint The male joint 13 will be described with reference to FIG.
The open end surface 12a of the other end 12 of the box body 10 serves as a propulsion force transmission surface in the same manner as the end surface 11a described above, and thus is formed as a plane orthogonal to the axis of the box body 10.

  The outer peripheral surface of the opened other end 12 of the box body 10 is recessed over a predetermined width along the axial direction from the end surface 12a, and the base of the annular sealing material 14 is embedded in the recessed stepped outer peripheral surface 12b. ing.

The sealing material 14 is a known sealing material made of rubber, and in this example, a case where one sealing material 14 is attached is shown, but a plurality of sealing materials 14 may be arranged in parallel at a predetermined distance.
Further, the installation time of the sealing material 14 may be retrofitted after the box body 10 is formed, in addition to the case where the box body 10 is attached in advance when the box body 10 is formed.

(5) Usage example 1 of culvert box
The culvert box 1 described above can be used by applying it to a general cutting method in which an axial force (propulsion reaction force) does not act during construction as in the conventional case.
The joining method of the culvert boxes 1A and 1B will be described with reference to FIG. 4. The extension portion 20b of the constraining ring 20 that also serves as a female joint of one (right) culvert box 1A is connected to the other (left). While fitting the male joint 13 of the culvert box 1B, or while fitting with the opposite combination, the culvert boxes 1 are sequentially added.
At this time, the two end faces 11a and 12a are fitted until they come into contact with each other.

As a result, the sealing material 14 attached to the male joint 13 is in pressure contact with the inner peripheral surface of the extending portion 20b constituting the constraining ring body 20, and a good sealing property is provided between the male joint 13 and the constraining ring body 20. Can be secured.

(6) Usage example 2 of culvert box
The culvert box 1 described above can be used by being applied to the Messel shield method in which axial force (propulsion reaction force) acts during construction.
After setting the Messel shield machine (not shown) in the cut groove, the culvert boxes 1 suspended in the cut groove are sequentially fitted in the same manner as described above.
Then, the reaction force is obtained from the existing culvert box 1 and the Messel shield machine is dug in the direction of the planned installation.

When propelling the Messel shield machine, as shown in FIG. 4, a large thrust reaction force in the axial direction acts on the joint of the culvert box 1, and this thrust reaction force is applied to both end faces 11a and 12a of the fitting portions that are in contact with each other. Each acts as a compression force.
The present invention can effectively suppress the compression deformation of the fitting portion by the restraining action of the restraint ring 20 described in detail below.

In the culvert box 1 (1 </ b> A), the open end 11 of the box body 10 is covered with a restraint ring 20.
Therefore, the open end 11 of the box body 10 is a composite structure of steel and concrete, and the strength is increased.

  Further, the extending portion 20b extending from the constraining ring body 20 substantially constrains the outer peripheral surface of the male joint 13 of the culvert box 1 (1B) to form a composite structure of steel and concrete.

Therefore, even if the open end 11 and the other end 12 of each box body 10 are compressed due to the large thrust acting in the axial direction on the culvert boxes 1 and 1 (1A and 1B), the restraint ring Since the body 20 restrains the outward compression deformation, the concrete frame is not easily damaged.
Therefore, the propulsion reaction force is transmitted between the adjacent both end faces 11a and 12a, and damage to the plurality of culvert boxes 1, 1 (1A, 1B)... Group can be avoided.

As described above, even if the opened one end 11 and the other end 12 of each box body 10 are compressed, they are not compressed and broken, and the culvert boxes 1, 1 (1A, 1B) are restrained. Good sealability is ensured by the combination of the ring body 20 and the sealing materials 14 and 15.
For this reason, even if a plurality of culvert boxes 1, 1 (1A, 1B)... Are connected together and digging with a Messel shield machine, there is no damage to the water stop element of the fitting portion. The water stoppage of the fitting portion of 1, 1 (1A, 1B) is not impaired.

In addition, although the above demonstrated the case where each culvert box 1 was used for the Messel shield construction method, it is needless to say that it can be applied to the propulsion construction method propelled from the shaft into the ground.

Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
FIG. 5 shows that the stepped outer peripheral surface 12b of the opened other end 12 of the box body 10 constituting the culvert box 1 is inclined with respect to the axis of the box main body 10, and an annular sealing material 14 is attached to the inclined stepped outer peripheral surface 12b. Another embodiment worn is shown.
In the case of the present embodiment, the step outer peripheral surface 12b is formed in a downward slope toward the end surface 12a.

By adopting the inclined step outer peripheral surface 12b as in this example, there is not only an advantage that the mold for forming the step outer peripheral surface 12b can be easily removed, but also the culvert box 1, 1 due to an earthquake or the like. Even when (1A, 1B) is displaced in the axial direction, the facing distance between the inner peripheral surface of the extending portion 20b of the constraining ring body 20 and the sealing material 14 is constant, so that good sealing performance can be maintained. There are advantages.

The above is a description of the case where the sealing material 14 that seals between the male joint 13 and the inner peripheral surface of the extending portion 20b constituting the constraining ring body 20 is attached to the stepped outer peripheral surface 12b of the male joint 13, On the contrary, the sealing material 14 may be attached to the inner peripheral surface of the extending portion 20 b constituting the constraining ring body 20.
Even if the sealing material 14 is attached to the restraint ring 20 side as in this example, the sealing performance similar to that of the above-described embodiments can be maintained.

Further, the case where the entire box body 10 is integrally formed has been described above. However, the box body 10 may be configured by a plurality of divided bodies divided along a dividing line parallel to the axis.
By dividing the box body 10 into a plurality of divided bodies, the divided bodies can be easily transported and moved, and the caliber box 1 having a large diameter can be designed.
In the case of this example, an annular constraining ring body 20 is mounted after assembling a plurality of divided bodies into the box-shaped box body 10.
If it does so, since the restraint ring 20 functions as a collar member, the integrity of the split-type box body 10 is improved.
In this example, the seal members 14 and 15 are attached after the divided box body 10 is assembled.

Overall perspective view of a box culvert according to Embodiment 1 of the present invention Longitudinal section of the open end of the box body Vertical section of the other open end (male joint) of the box body Longitudinal sectional view of the fitting part with box culvert fitted The longitudinal cross-sectional view of the fitting part of the box culvert concerning Example 2 of this invention

Explanation of symbols

1 (1A, 1B): Box culvert 10: Box body 11: Opened end 11a of box body: End surface 11b: Step outer peripheral surface 12 .... the other open end 12a of the box body ... the end face 12b ... the outer peripheral surface of the step 13 ... the male joint 14 ... the sealing material 15 ······ Sealing material 20 ······ Restraining ring 20a ··· Base end portion 20b · · · Extension portion of restraint ring

Claims (7)

A culvert box comprising a box body made of concrete with both ends open,
A constraining ring provided by constraining the outer peripheral surface of the step at the open end of the box body;
A male joint integrally formed with the other open end of the box body;
A part of the restraint ring is extended in parallel with the axis from the end surface of the box body to form an extension portion that serves both as a restraint member and a female joint,
Calvert box.   2. The culvert box according to claim 1, wherein a water-swellable sealing material is interposed between the stepped outer peripheral surface of the open end of the box body and the restraint ring.   The culvert box according to claim 2, wherein a resin coating layer is additionally interposed between the outer peripheral surface of the step and the peripheral surface of the constraining ring.   The open end of the box body and the both end faces of the other end of the box body are formed as planes orthogonal to the axis of the box body so that propulsive force can be transmitted. Features a culvert box.   The culvert box according to any one of claims 1 to 4, wherein an annular sealing material is attached to an outer peripheral surface of a step constituting the male joint.   The culvert box according to any one of claims 1 to 4, wherein the sealing material constituting the male joint is attached to the inner peripheral surface of the extending portion of the constraining ring body.   The culvert box according to any one of claims 1 to 6, wherein the box body is constituted by a plurality of divided bodies divided along a dividing line parallel to an axis thereof.

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