JPS6053234B2 - culvert joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underdrain joint that can be manufactured at low cost and can be expanded and contracted, and is applied to a secondary lining type underdrain.

As a conventionally proposed joint for underdrains, anchoring members each having a housing part are fixed to a pair of underdrains that are to be opposed,
A flexible water-stopping member is provided between both anchoring members to stop water inside and outside the culvert, and both ends of the flexible water-stopping member are inserted into the casing of each anchoring member in a non-removable and slidable manner. There is also a type in which a load-bearing member consisting of a large number of rod-shaped bodies arranged side by side is installed.

In this type of culvert joint, the load-bearing member prevents excessive expansion/contraction and shearing relative displacement between the two culverts, and prevents forced deformation of the flexible water-stopping member. Even if earth and sand invade the installation space, the load is supported by the load-bearing members, so the durability and reliability of the joint are maintained at a high level. However, while underdrain joints that have load-bearing members maintain a high level of joint functionality, the load-bearing members themselves are expensive, which increases the production cost of the joints, and the heavy load-bearing members cannot be used in underdrains with limited space. Since it is difficult to assemble a large number of these devices in parallel, the assembly work becomes difficult. In the case of a secondary lining type culvert, the present invention may include a secondary lining of concrete, depending on the structure.
Considering that the mortar layer can serve as a load-bearing member, a secondary concrete intrusion prevention plate is installed between the anchoring members at the inner periphery of the space in which the flexible water-stopping member is installed. By extending a secondary wound concrete layer from the ends of both culverts that should be connected to the inside, and having this secondary wound concrete layer function as a load-bearing member, it is possible to eliminate the conventional load-bearing members that are installed in parallel, and to The purpose of the present invention is to provide a joint for an underdrain that greatly reduces production costs and facilitates assembly work.

An embodiment of the underdrain joint of the present invention will be described below with reference to the drawings. In FIG. 1, 1 and 1' indicate a pair of opposing secondary lined underdrains to be connected.

The figure shows culverts 1 and 1' as integral cylindrical culverts with the primary winding side made of steel and the secondary winding side made of concrete, but the invention is not limited to this, and either steel or concrete can be arbitrarily selected. I can do it. Further, although the culverts 1 and 1'' are shown as having a circular cross-sectional shape, they are not limited to the circular shape and may be square, rectangular, polygonal, horseshoe-shaped, or other shapes.The culverts 1 to be connected , 1'', an underdrain joint A is interposed. In this case, an auxiliary segment (not shown) may be interposed between the joint A of the underdrain and the underdrains 1 and 1'' in order to facilitate the installation of the joint A of the underdrain. This shows the cross-sectional configuration of the joint, and for symmetrical parts in the figure, the reference numeral of one member with a dash added to the other member is used to omit the explanation of the other member as necessary. do.

In Figure 2, the joint A of the underdrain is connected to the underdrain 1,
A pair of anchoring members 10, 1'' fixed to the ends of the
A rubber bridge provided between the pair of anchoring members 10, 10'';
Primary water stop member 20 made of a cylindrical flexible member such as synthetic resin
and both anchoring members 10 at the inner peripheral position of the primary water stop member 20,
1 "Secondary water stop member 30 made of a cylindrical flexible member such as rubber or synthetic resin installed between the two, and the space in which the primary water stop member 20 and the secondary water stop member 30 are arranged on the inner peripheral side. A secondary concrete intrusion prevention plate 40 is provided in a cylindrical shape spanning between the two anchoring members 10 and 1, and a pair of culverts are provided at the inner circumferential position of the secondary concrete intrusion prevention plate 40. Anchoring member 10 consists of secondary rolled concrete layers 50 and 5' extended from 1 and 1'' so as to approach each other and face each other.
, 1' has a seat surface for attaching a water stop member, and as shown in FIG. 3, it is made up of a plurality of divided segments assembled into a cylindrical shape in the circumferential direction of the joint.

Each segment has an end plate 11 at its end, and adjacent segments can be assembled by aligning the end plates 11 and 11 with bolts 12.
, by tightening with nuts. Anchoring member 1
0 has an extending portion 13 extending toward the opposing anchoring member 1', and a seating surface 14 for mounting the primary water stop member 20 is formed on the inner surface of this extending portion 13. There is. Further, the end surface of the anchoring member 10 facing the other anchoring member 10'' is formed into a plane perpendicular to the seat surface 14, and this surface serves as the seat surface 15 for mounting the secondary water stop member 30. .Anchoring member 1
0 to the primary winding layer of culvert 1 is bolted if the primary winding layer of culvert 1 is made of steel segments or concrete segments, and illustration is omitted when the primary winding layer of culvert 1 is made of concrete. This is achieved by embedding the anchor in the underdrain concrete. A skin plate 60 is provided at the outermost peripheral position of the anchoring members 10, 1', spanning both the anchoring members 10, 1'.

One end of the skin plate 60 is welded all around to one of the anchoring members 10, and the other end comes off when a tensile force of a certain value or more is applied, allowing expansion and contraction displacement between the two anchoring members 10 and 1. It is partially fixed to the other anchoring member 1' by spot welding. The skin plate 60 has a function of preventing earth and sand from entering the water stop member installation space from the outside. The primary water stop member 20, which is installed between the two anchoring members 10 and 1, has both ends applied to the primary water stop member mounting seat surface 14, is held down by a holding plate 21, and is secured by bolts and nuts 22. It is kept watertight.

This achieves a primary water stop between the inside and outside of the underdrains 1, 1''. Even if a relative displacement occurs between the underdrains 1, 1'', the primary water stop member 20 absorbs the relative displacement by deforming itself. It is preferable to have a U-shaped or wave-shaped sag in the center to allow for smoothness, but if a relatively small amount of expansion and contraction is required, it may be formed in a straight cross-sectional shape without any sag. . If the skin plate 60 is damaged, earth and sand will enter, and pressure from underground water will be applied to the outer periphery of the primary water stop member 20, but when cleaning with a large load, it is necessary to use rubber, synthetic resin, etc. It is sufficient to use a primary water stop member 20 in which a reinforcing layer 23 made of cloth or the like is embedded in an elastic material. The secondary water stop member 30 disposed at the inner circumferential position of the primary water stop member 20 has both ends attached to the seat surface 15 for attaching the secondary water stop member.
It is pressed by a holding plate 31 and tightened with bolts and nuts 23 in a watertight state.

This will provide a secondary water stop between the inside and outside of culvert 1.
Even if the primary water stop member 20 described above is damaged, the secondary water stop member 30
Water stoppage can still be maintained in a sound manner. The secondary water stop member 30 may have a U-shaped, wave-shaped, or other sag in the center so that even if a relative displacement occurs between the two underdrains 1, 1'', it can deform itself and absorb the relative displacement. Although it is desirable, if a relatively small amount of expansion and contraction is required, it may be formed into a straight cross-sectional shape without any slack.Also, if a large load such as internal pressure is applied to the secondary water stop member 30, The secondary water stop member 30 may be made of a reinforcing layer such as cloth embedded in an elastic material such as rubber or synthetic resin.A secondary winding that covers the water stop member installation space from the inner circumference side. One end of the concrete intrusion prevention plate 40 is welded all around the inner peripheral surface of one of the anchoring members 10, and the other end comes off when a tensile force of a certain value or more is applied to both anchoring members 10, 1' is fixed to the other anchoring member 1' by spot welding so that expansion and contraction displacement between the anchoring members 1' and 1' can be accommodated.

In addition, in the circumferential direction, as shown in FIG.
It is welded and assembled into a cylindrical shape. When concrete or mortar is placed as a secondary concrete layer, the secondary concrete intrusion prevention plate 40 functions as an end plate to prevent concrete and mortar from entering the water stop member installation space. have. The secondary concrete layer 50 cast on the inner circumferential side of the secondary concrete intrusion prevention plate 40 has a slight gap between the opposing end surfaces, and a joint material 51 is usually interposed therebetween. .

If only expansion/contraction displacement is required as the displacement between both culverts 1, 1'', that is, if shear displacement is to be restrained, a recess 52, 52'' is provided in the center of the secondary rolled concrete layer 50, 5''.
is formed, and a dowel bar 53 is inserted across both recesses 52 and 55''.The dowel bar 53 is usually made of a steel rod and has the function of preventing uneven settlement at the joint part of the underdrain. The underdrain joints with the culvert function as follows.

First, when a relative displacement occurs between the underdrains 1 and 1'' in the direction of proximity, the opposing ends of the secondary rolled concrete layer 50 compress the joint material 51 and prevent further proximity.At this time, The skin plate 60 and the secondary concrete intrusion prevention plate 40 may wrinkle due to compression, or the end on the spot welding side may become unfixed to the anchoring member 1', allowing free relative displacement but stopping. In addition to preventing the entry of earth and sand into the water member installation space, the primary water stop member 20 and the secondary water stop member 30
With just a slight elastic deformation, the water stop can be maintained in a sound state. When the underdrains 1 and 1'' are relatively displaced in the direction of separation, both the skin plate 60 and the secondary concrete intrusion prevention plate 40 are unfixed to the anchoring member 1'' at the end on the spot welding side, and are free to move. Allow relative displacement.

As the relative displacement in the direction of separation progresses, the anchoring member 1', 1
The gap between the extended portions 13 and 13'' of the 0 expands, and the skin plate 60 becomes unable to support the earth and sand, and the skin plate 60 bulges inward, eventually allowing the earth and sand to invade the water stop member installation space. However, the load due to the earth and sand is first supported by the primary water stop member 20 and then by the secondary water stop member 30. In this case, since the water stop members 20 and 30 are made of an elastic material, It is possible to deform greatly, and the deformation is supported by the secondary concrete layer 50 via the secondary concrete intrusion prevention plate 40. Even if the saw water stop member 20 is damaged due to large expansion and contraction. Even in this case, the water stoppage is still maintained by the secondary water stoppage member 30. Therefore, as long as the secondary rolled concrete layer 50 effectively supports the waterstop member, the waterstop function by the waterstop member remains sound. If the dowel bar 53 is not provided and shear displacement occurs between the underdrains 1 and 1'', this displacement causes the primary water stop member 2 to
0. The water stop function is maintained until both of the secondary water stop members 30 are damaged.

When the dowel bar 53 is provided, the shearing displacement is restrained, so no shearing problem occurs. When using the culvert joint according to the present invention, since a secondary-wound concrete intrusion prevention plate is provided and a secondary-wound concrete layer is placed inside the plate, excessive deformation of the water-stopping member can be suppressed, and conventional joints It is possible to remove the load-bearing member that had a similar function in the previous embodiment, thereby reducing the cost of the device and simplifying the assembly work.

In this case, by installing a dowel bar across the secondary concrete layer, it is possible to prevent relative shear displacement between the underdrains.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a culvert to which the culvert joint of the present invention is applied;
Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a partially cutaway sectional view taken along the line ■-■ in Figure 2.
, ■b-■B, ■cm■c) Fig. 4 is a cross-sectional view of the vicinity of the joint in the circumferential direction of the secondary-wound concrete intrusion prevention plate.

Claims (1)

[Claims] 1. Anchoring members each having a seat surface for attaching a water-stopping member are fixed to opposite ends of a pair of underdrains to be connected, and a primary water-stopping member made of a cylindrical flexible member is installed between both anchoring members. In addition, a secondary water-stopping member made of a cylindrical flexible member is provided at the inner periphery of the tube, and a cylindrical member is installed so as to cover the installation space for the primary water-stopping member and the secondary water-stopping member from the inner periphery side. A secondary rolled concrete intrusion prevention board is installed across the board in the form of a secondary rolled concrete intrusion prevention board, and a secondary rolled concrete layer is installed at the inner peripheral position of the secondary rolled concrete intrusion prevention board so as to approach and face each other from the pair of culverts. A joint for a culvert characterized by the fact that it is provided with a joint.