JP3607755B2 - Box culvert flexible joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible joint structure of box culverts that can follow a relative displacement between adjacent box culverts.
[0002]
[Problems to be solved by the invention]
The joints of the box culverts that are connected to each other in the axial direction and are laid in the ground as waterways, underground passages, or joint grooves, etc., must have a structure that can follow relative displacement due to uneven settlement of the ground. In a form where water-stopping rubber is bonded to the end faces of both box culverts, which is a typical joint structure, and at the same time mortar is filled in the joints, the water-stopping ability may be impaired against large or impact displacement There is.
[0003]
In response to this problem, the applicant has a box culvert having a structure in which two concrete members constituting one box culvert are connected by a water-stopping member that can be expanded and contracted to absorb a large displacement. Is proposed in Japanese Patent Application Laid-Open No. 63-110327 and others.
[0004]
The flexible box culvert and the structure that absorbs the relative displacement between adjacent box culverts with the water stop member interposed between the joint end faces of the box culvert and the relative displacement is not so large. It is very effective while the relative displacement between the box culverts can be absorbed by the deformation of the water stop member.
[0005]
However, it is expected that the laid box culvert will be applied with a powerful force that is shocking for a short time, and a large relative displacement exceeding the design value will occur. When such a relative displacement occurs, in the conventional joint structure, the water stop member that should absorb the relative displacement becomes unable to absorb the relative displacement and is damaged, and the function as a box culvert is impaired.
[0006]
The present invention has been made paying attention to this point, and proposes a flexible joint structure that can flexibly cope with the relative displacement regardless of the relative displacement between the box culverts by adopting another joining method. is there.
[0007]
[Means for Solving the Problems]
In the present invention, (A) a hood is formed on each of the joining end portions of the two box culverts to be joined so as to project outward from the end portions and go around the top plate and both side plates. The box culvert protrudes in the axial direction from the end face of the hood, and the hood is provided with notches and bolt insertion holes at a plurality of predetermined locations. (C) The other box culvert has the end face connected to the hood. The hood is recessed in the axial direction, the hood is provided with notches and bolt insertion holes at a plurality of predetermined locations, and a steel plate is attached to the bottom plate as an extension of the bottom plate. (D) After attaching a water-stopping elastic body to the protruding joint end of one box culvert, this protrusion is fitted into the recess of the other box culvert, E) inserting the bolt into the bolt insertion hole provided in the hood of both box culvert, a flexible joint structure box culvert formed by fixing the both ends notches each bonding operation an elastic washer is interposed.
[0008]
In this invention, a reinforced concrete box culvert is flexibly joined by a new joining method, and for this purpose, a hood that circulates the top plate and both side plates is formed outside the joining ends of both box culverts to be joined. One box culvert is formed in a convex shape, and the other box culvert is formed in a concave shape and joined by a concave-convex joint. Rotating the hood to the bottom plate will provide unevenness on the bottom plate, which makes it difficult to install, so there is no hood on the bottom plate. Instead, a bottom plate extension is provided on the bottom plate of the concave box culvert. A steel plate is embedded in the form to be formed, and a recess surrounded by a hood and a steel plate is formed on all four sides.
[0009]
The first essential point of the present invention is the shape and structure of the joint end of the box culvert that can be joined in the axial direction by the concave and convex joint with a hood, and the second essential point is the joining operation to a plurality of predetermined locations of the hood. A notch and a bolt insertion hole are provided, and the bolt is inserted and tightened with a nut to fix the bolt to the notch for joining work. The third point is that an elastic washer is used when tightening the nut. It is the point which connects both box culverts elastically by interposing.
[0010]
The shape and structure of the box culvert at the joint end of the present invention is a shape and structure for flexibly joining the box culvert according to the present invention, and the joint end at the other end is formed of a general uneven joint or steel rod. The shape and structure are adapted to each joining method such as joints with bolts.
[0011]
Box culverts that employ the joint structure of the present invention are roughly classified into the following two types.
[0012]
(1) When one flexible box culvert having a shape in which two box culverts having a short shape and structure satisfying the above requirements are flexibly joined is produced in a factory.
[0013]
(2) When a box culvert having a normal length and shape satisfying the above requirements is joined on site to form a flexible joint structure.
[0014]
However, since the box culvert used in the present invention has a special shape and structure at the joint end, it is preferable to produce it as a single flexible box culvert by the method (1).
[0015]
The box culvert group joined by the joining method of the present invention is used as a general underground structure such as a common channel in addition to a water channel, a sewer, an underground passage, and the like, similar to those joined by the conventional joining method.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
1A and 1B show an example of two box culverts that are flexibly joined by the joining method of the present invention. FIG. 1A is an elevation view of one convex box culvert on the joining end side, and FIG. FIG. 3C is a side view of both the convex shape and the concave shape. FIG.
[0018]
2A and 2B are axial cross-sectional views showing details of an example of the flexible joint, wherein FIG. 2A shows a bolt connecting portion and FIG. 2B shows a bottom plate portion.
[0019]
As shown in FIG. 1A, the convex box culvert 1a has a hood 2a formed so as to protrude outside the top plate and both side plates of the joint end, and the main body is formed as a convex portion 6 of the hood 2a. It protrudes from the end face. The bottom surface of the convex portion 6 is formed to be slightly higher than the bottom surface of the main body. A plurality (four in the figure) of bolt insertion holes 3 are drilled in the hood 2a along the axial direction, and the ends of the bolt insertion holes 3 are opened to the notches 4 for joining work (see FIG. 2A). doing.
[0020]
As shown in FIG. 1 (b), the concave box culvert 1b is provided with a hood 2b that protrudes to the outside of the top plate and both side plates of the joint end, and a concave portion 7 is formed between the concave box culvert 1b and the main body. Yes. A steel plate 5 is embedded in the bottom surface of the bottom plate of the main body, and the steel plate 5 extends toward the hood 2b to form an extension of the bottom plate and forms the bottom surface of the recess 7. As in the case of the convex box culvert 1a, a plurality of bolt insertion holes 3 are drilled in the hood 2b along the axial direction, and the tip of the bolt insertion hole 3 is a notch 4 for joining work (FIG. 2 (a)). Open).
[0021]
An operation for flexibly joining the two types of box culverts will be described in order.
[0022]
(1) A water-stopping elastic body 8 (rubber sheet, rubber asphalt sheet, etc.) is attached to the peripheral surface of the convex portion 6 of the convex box culvert 1a so that the end of the water-stopping elastic body 8 protrudes from the peripheral surface. You may stick to the end surface of the convex part 6 so that the end of the water stop elastic body 8 may protrude from an end surface. Moreover, you may stick the water stop elastic body 8 to the surrounding surface and end surface of the convex part 6, respectively.
[0023]
(2) The convex box culvert 1a and the concave box culvert 1b each having the waterstop elastic body 8 adhered to the convex portion 6 are brought close to each other, and the convex portion 6 is fitted into the concave portion 7 of the concave box culvert 1b.
[0024]
(3) The convex box culvert 1a and the concave box culvert 1b are tightened with a predetermined force, and the bolts 11 are inserted into the bolt insertion holes 3 drilled in the hoods 2a and 2b of both box culverts. Fixing plates and elastic washers 12 are fastened to both ends of the bolt 11 in the joint cutouts 4 and 4 and the bolts 11 are fastened to the respective joint cutouts 4 by fastening them with the fitting nuts 13 (FIG. 2A). reference). After the work, a cover (not shown) is sealed in the notch 4 for joining work and sealed.
[0025]
Thus, the flexible joining operation is completed, and the gap between the joining end faces of the convex box culvert 1a and the concave box culvert 1b, the gap between the convex portion 6 of the convex box culvert 1a and the hood 2b, and the convex box. All the gaps between the convex portion 6 of the culvert 1a and the steel plate 8 are sealed by the waterstop elastic body 8, and the convex box culvert 1a and the concave box culvert 1b are elastic by the action of the elastic washer 12 of the bolt connecting portion. Will be connected.
[0026]
Note that FIG. 3 shows a case where a short box-shaped convex box culvert 1a and a short-length concave box culvert 1b are flexibly joined to produce a single flexible box culvert in a factory. It is a side view which shows an example of a combined state.
[0027]
If the relative position of the convex box culvert 1a and the concave box culvert 1b of the flexible box culvert 1b and the concave box culvert 1b, which are flexibly joined by tightening with a predetermined force, changes between production and completion of installation, the meaning of flexible joining Disappears.
[0028]
In order to prevent the relative position of the convex box culvert 1a and the concave box culvert 1b from changing, nuts (not shown) are embedded in the hood portions of the convex box culvert 1a and the concave box culvert 1b. The steel plate 21 is bridged between the embedded nuts of both box culverts, and the bolts 22 are screwed into the embedded nuts to fix the steel plate 21 to both box culverts. The fixing steel plate 21 is removed after the installation work on the flexible box culvert is completed.
[0029]
【The invention's effect】
The present invention is configured as described above, and is a concavo-convex joint in which a hood is provided at the joint end of both box culverts to be joined, and this hood is elastically connected by bolt connection. It is possible to cope with the relative displacement of both box culverts at two locations, a water-stopping elastic body that fills the gap and an elastic washer that is interposed at the bolt connection location. Therefore, there is no possibility that the water-stopping elastic body is damaged even in the case of a large relative displacement.
[Brief description of the drawings]
1A and 1B show an example of two box culverts that are flexibly joined by the joining method of the present invention, in which FIG. 1A is an elevation view of one convex box culvert on the joining end side, and FIG. FIG. 3C is a side view of both the convex shape and the concave shape. FIG.
FIGS. 2A and 2B are axial sectional views showing details of an example of a flexible joint, in which FIG. 2A shows a bolt connecting portion and FIG. 2B shows a bottom plate portion.
FIG. 3 shows an example of a combined state of both box culverts even after the completion of installation after production of one flexible box culvert in a factory by flexibly joining a convex box culvert and a concave box culvert. FIG.
[Explanation of symbols]
1a: Convex box culvert, 1b: Concave box culvert, 2a ... Convex box culvert hood, 2b ... Concave box culvert hood, 3 ... Bolt insertion hole, 4 ... Cutting for joint work Notch, 5 ... Steel plate, 6 ... Convex part of convex box culvert, 7 ... Concave part of concave box culvert, 8 ... Water stop elastic body, 11 ... Bolt, 12 ... Elastic washer, 13 ... Nut, 21 ... steel plate, 22 ... bolt.

Claims (1)

(A) A hood is formed on each of the joining end portions of the two box culverts to be joined so as to project outward from the end portions and go around the top plate and both side plates, and (B) one box culvert is joined. The end face protrudes in the axial direction from the hood end face, and the hood is provided with notches and bolt insertion holes at a plurality of predetermined locations. (C) The other box culvert has the joining end face in the axial direction from the hood end face. Two box culverts, in which the hood is provided with notches and bolt insertion holes for joining work at a plurality of predetermined locations, and a steel plate is attached to the bottom plate as an extension of the bottom plate (D) After attaching a water-stopping elastic body to the protruding joint end of one box culvert, this protrusion is fitted into the recess of the other box culvert, and (E) Scan inserting the bolt into the bolt insertion hole provided in the hood of the culvert, flexible joint structure fixed to become box culverts to both ends thereof notches each bonding operation an elastic washer is interposed.

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