JPS596999B2 - culvert joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a culvert used for connecting a cylindrical body made of concrete or steel and a cylindrical body made of a plurality of segments, such as sewerage, water supply, public ditch, underground passage, etc. It concerns joints.

Conventionally, as a joint for an underdrain, a short cylindrical flexible member made of rubber or synthetic resin is installed along the inner peripheral surface of the underdrain, and both ends of the flexible member are anchored to the inner peripheral wall surface of the underdrain to be connected. Alternatively, a bolt is provided on the back of the flexible member, and the cylindrical flexible member is suspended by the bolt, thereby minimizing distortion of the flexible member due to the difference in water pressure between the inside and outside of the culvert. The flexible member is designed to stop water and absorb relative displacement between the joints of opposing underdrains.

However, when using any type of culvert joint, if the two connected culverts move away from each other in the axial direction due to uneven ground subsidence or relative displacement of the ground during an earthquake, a large amount of gap will be created between the culverts. Sediment from outside the culvert enters through the gap and deforms the flexible member inward, causing a decrease in the durability and damage of the flexible member, as well as obstructing the flow inside the culvert and There was a problem of damage to piping and structures.

In order to eliminate these peaks, the applicant of this patent has
An anchoring member having a seat in the center and a casing at each outer peripheral position is attached to the opposite end of the culvert to be maintained, and a flexible member is straddled between the seats of the anchoring member. In addition to establishing
Inside this flexible member, a large number of rod-shaped load-bearing members are arranged in parallel at each outer circumferential position, with both ends of the rod-shaped load-bearing members being movably inserted within a certain range into the casing of the anchoring member but not detachable. has proposed an underdrain joint that prevents separation of the joint while allowing appropriate displacement between both underdrains and prevents harmful deformation of the flexible member.

In other words, the proposed culvert joint is designed to prevent dirt, etc. from entering into the flexible member arrangement portion, and to prevent excessive relative displacement of both culverts to be connected. The structure was such that they were provided inside and at the outer periphery of the member.

However, since load-bearing member groups require a considerable amount of work to assemble and are expensive, providing two groups of them around the flexible member would greatly increase the amount of work required to assemble the culvert joint itself. In addition, the structure of the casing of the anchoring member that supports both ends of the load-bearing member also requires a considerable amount of space, so it is difficult to provide a casing inside or around the flexible joint. The size of the joint itself increases, which increases the cost.
There was a concern that this would result in an increase in the amount of excavation needed to install joints for the culvert.

In addition, if the load-bearing members are directly exposed to the inner circumferential surface of the underdrain, the water flow resistance within the underdrain will increase, so it is recommended to further install a water-stopping member with a flat inner surface on the inner circumference of the load-bearing member. Although this is desirable, there is also the problem that the underdrain joint becomes larger.

In the present invention, when one flexible member is provided between the anchoring members for the purpose of stopping water between the inside and outside of the underdrain in a joint of the underdrain, both internal pressure and external pressure are applied to the flexible member. A load-bearing member must be installed at the outer periphery of the member, but
When two flexible members are provided, by providing a group of load-bearing members between them, the inner flexible member receives only internal pressure, and the outer load-bearing member receives only external pressure, so that each can only withstand deformation in one direction. Focusing on the fact that it is sufficient to control the load-bearing members, by configuring a structure in which a flexible member is provided at each of the outer circumferential positions in one group of force-bearing members, the above-mentioned conventional problems are solved, and the inner part of the load-bearing members is A flexible member provided at a circumferential position,
To provide a joint for underdrains which can follow relative displacement between the underdrains and which solves the problem of flowing water resistance at the same time without increasing the size of the joint by using a member having a flat inner surface structure.

EMBODIMENT OF THE INVENTION Below, the Example of the joint of the underdrain of this invention is demonstrated with reference to a figure.

In FIG. 1, primary soil-covered sewerage underdrains A and A', which are divided into a plurality of pieces in the circumferential direction, are shown as underdrains to be connected.

However, the shape and type of the culverts A and A' are not limited to circular or sewage culverts, but may be other shapes such as rectangular or other types such as waterworks or underground passages.

A joint B of the underdrain is interposed between the underdrains A and A' to be connected, if necessary, via joint segments A1 and A1' (not necessary), but normally this joint B of the underdrain is
is placed in places where uneven ground subsidence is expected, such as culverts near vertical shafts.

Figure 2 shows the cross-sectional configuration of the joint B of the culvert. In the figure, symmetrical members are indicated by the reference numerals (with a dash) attached to the other member. Omit the explanation as necessary.

In Figure 2, joint B of the underdrain is connected to underdrain A.
, A', a pair of anchoring members 10.
1 0', a large number of load-bearing members 20 arranged in parallel between the pair of anchoring members 10 and 10', and a rubber member installed in the outer peripheral position of the load-bearing members 20 astride the anchoring members 10 and 10'. Or an inner circumferential flexible member 30 and an outer circumferential flexible member 4 made of synthetic resin.
0, and a flexible external water stop member 5 installed astride the anchoring members 10 and 10' at the outer peripheral position of the outer peripheral flexible member 40.
0.

A flute body portion 12 having an opening 11 on one side of the anchoring member 10;
It has an end plate 13 that extends from the outer circumferential position of the casing part 12 toward the outer circumferential direction of the joint and forms a joint part with the end surface of the underdrain A, and is divided into a plurality of pieces as shown in FIG. It consists of segments 1 assembled into a cylindrical shape in the circumferential direction of the joint.

This circumferential assembly of the joint is performed by a connecting portion 14 provided as a part of the anchoring member 10 on the underdrain A side of the housing portion 12.

That is, the connecting portion 14 has an end plate 15 extending in the joint axial direction on the joint circumferential end face of the segment, and the end plate 15 is formed to match the end plate of the connecting portion of the adjacent segment. This is done by inserting the port 17 into the bolt hole 16 and tightening the segments together.

The load-bearing member 20 is inserted into the anchoring member 1 0 , 10 ′ in the housing portion 1 2 . 1 A part of 2' has a removable structure, and after the detachable part is removed and the load-bearing member is attached, the detachable part is attached to the original position, or the load-bearing member 2 is attached to the housing parts 12 and 12'.
This can be done by providing a hole for 0 persons and closing the hole after inserting the force-bearing member 20.

At the inner and outer peripheral positions of the opening 11 of the housing part 12,
Seat portion 12a for coupling the inner peripheral flexible member 30 and the outer peripheral flexible member 4
A seat portion 12b for 0 coupling is provided.

The seat portion 12a is formed on the inner peripheral surface of the housing portion 12a,
1 seat part 12b is formed in relation to a holding member for holding a flexible external water stop member 50, which will be described later, which is fixed to the housing part 12.

However, the seat portion 12b may be formed directly on the end surface of the housing portion 12, and the seat portion 12a may be formed on the end surface of the housing portion 12.

The anchoring member 10 can be attached to the culvert A by embedding the anchor 14a provided on the end face of the anchoring member 10 on the culvert A side in the culvert A, if the culvert A is made of concrete, as in the past.
If the underdrain is made of segments made of concrete or steel, this is done by bolting the anchoring member 10 to the underdrain A.

The load-bearing member 20 installed astride between the anchoring members 10 and 10' is
It consists of a rod-shaped body whose both ends are inserted into the housing portions 12, 12' through the openings 11, 11' so as to be movable within a certain range but cannot be removed.

A large number of force-bearing members 20 are arranged in parallel between the anchoring members 10 and 10', and a kind of cylindrical body is formed by this group of force-bearing members.

A protrusion 21 is formed at the end of the load-bearing member 20, and by making the height h1 of the protrusion 21 smaller than the height h2 of the opening 11 of the casing 12 of the anchoring member 10, the joint Efforts are made to prevent it from coming off in the axial direction.

The spacing between adjacent force-bearing members 20, 20 in the circumferential direction of the joint is regulated to prevent deviation from occurring and a large gap between the force-bearing members 20, 20.

FIG. 2 and FIGS. 4 to 6 show this load-bearing member 20,
20 is achieved by attaching comb-like plate pieces 23 to the housing part 12 with bolts and inserting and supporting an appropriate number (two in the figure) of load-bearing members 20 between the comb crests. There is.

However, the spacing regulation of the load-bearing members is not limited to this illustrated example; for example, a joint material 2 made of rubber, synthetic resin, asphalt, caulking material, etc. is used between the load-bearing members 20, 20.
4 may be interposed to regulate the spacing.Alternatively, the load-bearing member may be composed of two types of load-bearing members: a load-bearing member with a protrusion and a load-bearing member with a hole. The mutual positional relationship may be regulated by entering the hole, and the distance regulating means may be selected arbitrarily.

Anchoring members 10, 1 (r
An inner circumferential flexible member 30 made of rubber or synthetic resin is placed between them.

The cross-sectional shape of the inner peripheral flexible member 30 has a wavy portion 30a formed in a wavy shape so as to be able to sufficiently follow the relative displacement between the underdrains A and A' while maintaining a water stop function.
Connect the top of the inner circumferential side of the joint in a straight line and connect the underdrain A,
It is formed in a shape having a straight portion 30b located at the same height as the inner peripheral surface of A'.

The end of the flexible member 30 is formed in a shape that follows the end surface of the casing 12, and is held between the seat 12a of the casing 12 and the holding plate 31 and tightened with a bolt 32. As a result, it is fixed to the anchoring member 10 in a watertight manner.

As a result, the watertightness between the inside and outside of the culvert is as follows: culvert A, A'
is maintained regardless of the presence or absence of relative displacement between them.

Since the outer circumferential flexible member 40 is present, the inner circumferential flexible member 30
receives only internal pressure, but the deflection of the inner peripheral flexible member 30 due to the internal pressure is supported by the force-bearing member 20 group.

At the outer peripheral position of the force-bearing member 20 group, similar to the internal fixed flexible member 30, there is an anchoring member 10. An outer circumferential flexible member 40 made of rubber or synthetic resin is disposed astride between 10' and 10'.

The outer circumferential town flexible member 40, like the inner town flexible member 30, is connected to the culvert A.
, A', and is formed into a short cylindrical body, for example, in a wave-shaped cross section, so as to be able to sufficiently follow the relative displacement between A' and A'.

The end of the outer peripheral flexible member 40 is formed in a shape that follows the end surface of the seat 12b disposed on the outer periphery of the opening 11 of the housing 12, and the end is connected to the seat 12b and the presser plate 41. It is fixed to the anchoring member 10 in a water-tight manner by clamping it with the ports 42 and tightening it with the ports 42.

By providing the inner circumferential flexible member 30, the outer circumferential flexible member 40
Although only external pressure is applied to the outer peripheral flexible member 40, the bending of the outer circumferential flexible member 40 due to the external pressure is supported by the force-bearing member 20 group.

This configuration ensures a double water stop between the inside and outside of the underdrain.

On the inner surface of the joint of the end plate 13 of the casing part 12, an anchoring plate 60, which is a component of the underdrain A and extends along the circumferential direction of the joint, connects a plurality of segments into a cylindrical shape in the circumferential direction of the joint. While being assembled, the end plate 13 is attached by bolts, nuts 61, etc.
It is assembled into one piece.

Furthermore, a flexible external water stop member 5 is provided on the inner surface of the joint of the anchoring plate 60.
The holding member 70 for supporting both ends of the bolt is the bolt,
The housing end plate 13 is fixed by a nut 61.

The holding member 70 includes a plate body 71 that has a shape that follows the surface of the anchoring plate 60 and is divided into a plurality of parts in the circumferential direction of the joint, and a plate body 71 that extends from the plate body 71 in the joint axis direction and toward the opposing anchoring member 10' side. It has a seat part 72 that is spaced apart from each other, and a horizontally extending part 73 that connects the outer peripheral position of the plate body 71 and the outer peripheral position of the seat part 72.

Outer circumference. At the outer circumferential position of the flexible member 40 and between the seats 72 of the holding member 70, a flexible external water stop member 50 made of rubber or synthetic resin and having a reinforcing material embedded therein is provided astride.

The flexible external water stop member 50 is used to prevent water leakage and intrusion of earth and sand from the outside when assembling the joint between the underdrains A and A', and to prevent the relative water stoppage between the underdrains A and A' after assembly. It is provided to follow the displacement up to a certain range and prevent the intrusion of water and dirt, and is made of, for example, a short cylindrical body with a bent cross-sectional shape.

The end portion of the flexible external water stop member 50 is connected to the seat portion 7 of the holding member 70.
2, and is firmly fixed to the holding member 70 in a watertight manner by sandwiching this end portion between the seat portion 72 and the holding plate 51 and tightening it with the bolt 52.

A skin plate 74 made of a thin steel plate is fixed to the outer periphery of the extension part 73 by welding or the like on the outer periphery of the anchoring members 10, 10' so as to cover the gap between the two extension parts 73, 73'. The short cylindrical body straddles the body.

The skin plate 74 is mainly provided to prevent the leakage of water and the intrusion of earth and sand from the outside, similar to the flexible external water stop member 50 described above, when assembling the joint. It is constructed so that when a relative displacement occurs between A', it breaks and allows relative displacement freely.

However, even in this state, the flexible outer water stop member 50 maintains its strength and can deform to follow the displacement, so intrusion of earth and sand and water leakage are prevented. Watertight conditions inside and outside the culvert will be maintained in a healthy manner.

Note that a member designated by the reference numeral 80 in FIG. 2 is an injection nozzle, and a filler such as a foamable urethane resin is injected into the space of the casing portion 12 from this injection nozzle 80 as necessary.

This prevents dirt and the like from entering the housing portion 12 and deteriorating the function of the load-bearing member 20 group.

Next, the function of the joint B of the underdrain will be explained.

Before the relative displacement occurs between the culverts A and A', the skin plate 74 and the straight part 30b of the inner circumferential bending member 30 are functioning normally, and the water is stopped between the inside and outside of the culvert. The intrusion of earth, sand, garbage, etc. into the joint B of the culvert is blocked.

Furthermore, the running water inside the culvert flows smoothly because the flat linear portion 30b of the inner peripheral flexible member 30 is at the same height as the inner surface of the culvert.

When a relative displacement occurs between the culverts A and A' due to uneven subsidence or an earthquake, only the skin plate 74 is damaged while the displacement is small, and the flexible outer water stop member 50 and the inner flexible The straight portion 30b of the member 30 is functioning normally and water is blocked between the inside and outside of the underdrain.

Since the outer water stop member 50 is reinforced with cloth or the like, it has sufficient strength against the intrusion of earth and sand, but even if it is damaged by the intrusion of earth and sand, the outer peripheral flexible member 40 will not be deformed. Since the outer circumferential flexible member 40 is supported by the load-bearing member 20, the outer peripheral flexible member 40 will not be damaged and water-tightness will be maintained sufficiently.

If a larger relative displacement occurs between the culverts A and A', the force-bearing member 20 restrains the displacement.

That is, when a displacement occurs between the underdrains A and A' in the axial direction of the underdrains, the tip of the load-bearing member 20 comes into contact with the wall surface of the casing part 12 in the case of the adjacent direction, preventing further displacement of the underdrains A and X. In the case of displacement in the direction of separation, the protrusion 21 of the force-bearing member 20 engages with the edge of the opening 11 of the casing 12 to prevent further displacement of the culverts A and A'.

Further, when a displacement occurs between the underdrains A and A' in the direction perpendicular to the underdrain axis direction, the state in which the load-bearing members 20 groups are arranged side by side changes from the state shown in FIG. 7 to the state shown in FIG. 8, and the load-bearing members 20, The gap e between the side surfaces of the 20 comrades becomes small (e') and eventually reaches zero, and further progress of displacement is restrained.

Therefore, by the 20 groups of load-bearing members, the culverts A, A
The displacement between ' is limited to a certain amount both in the axial direction of the joint and in the direction perpendicular to the axial direction of the joint.

Therefore, a large displacement occurs and the flexible external water stop member 50,
Even if the straight portion 30b of the inner circumferential flexible member 30 is damaged, the wavy portions 30a of the outer circumferential flexible member 40 and the inner circumferential flexible member 30 are not forced to deform to the extent that they are damaged, and the culverts A and A are
' will always maintain a watertight condition on the inner and outer peripheries of the culvert while being restrained by an appropriate amount of relative displacement.

The functions and actions described above are performed by one stage of 20 groups of load-bearing members and two stages of outer circumferential flexible members 30 and 40, which are respectively provided astride the inner and outer peripheries of this 20 force-bearing members.
A group of load-bearing members is arranged at the inner and outer peripheral positions of a conventional one-stage flexible member.

In other words, it is comparable to the case where two stages of load-bearing members are installed! Regardless of the function, the configuration in which one stage of the load-bearing members is removed makes it easier to assemble the underdrain joint, and the underdrain joint can be made smaller, reducing the amount of underdrain excavation required to install the underdrain joint. There are also effects other than the underdrain joint itself, which requires only a small amount.

Therefore, when the underdrain joint according to the present invention is used, between the anchoring members which have a housing part and are attached to the end face of the underdrain to be connected, the end part is movable within a certain range within the housing part. In addition, a large number of force-bearing members that are supported in a non-removable manner are installed astride the inner and outer circumferential flexible members, respectively, so that only internal pressure is applied to the inner circumferential flexible members. Since only external pressure is applied to the outer circumferential flexible member, the deformation thereof is always supported by the load-bearing member, and even if a relative displacement occurs in the culvert to which it should be connected, it will follow it and maintain the watertightness of the culvert. In addition to being reliable, it can save space, be smaller, be easier to assemble, reduce costs, and reduce the amount of excavation compared to conventional underdrains.

In addition, since the inner peripheral flexible member is configured so that its cross-sectional shape has a wavy portion and a straight portion that connects the top of the wavy portion on the inner peripheral side of the joint, excessive displacement occurs between the culverts. Until then, it is possible to prevent an increase in water flow resistance, and even if the straight part of the inner circumferential flexible member is damaged due to excessive displacement of the range restrained by the load-bearing member, it can still sufficiently stop water inside and outside the culvert. Obtain the effect of being able to maintain.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view schematically showing the underdrain joint of the present invention used for connecting an underdrain. FIG. 2 is a partially enlarged sectional view of the joint of the underdrain shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line I-III and line m'-1' in FIG. 2. FIG. 4 is a front view showing the load-bearing member of FIG. 2. FIG. 5 is an enlarged cross-sectional view of the state in which the plate piece 23 is used to regulate the spacing along the line V-1 in FIG. FIG. 6 is an enlarged sectional view taken along the line Vl-■ in FIG. 4. FIG. 7 is a side view of the load-bearing member portion before relative displacement occurs between the underdrains. FIG. 8 is a side view of the load-bearing member portion after a relative displacement occurs between the underdrains. A, A'......Culture to be connected, B...
...Drain joint, 10,10'... Anchoring member,
11, 11'...Opening, 1 2, 1 2'
...Housing part, 12a, 12b... Seat part, 1 3 , 1 3' ... End plate, 1 4 ,
1 4'... Connection portion, 20... Load-bearing member, 30... Inner peripheral flexible member, 30a...
...Wave-like part, 30b...Straight part, 40...
...Flexible outer peripheral member, 50...Flexible outer water stop member, 70...・・・． Holding member, 72... Seat part,
74...Skin plate.

Claims (1)

[Claims] 1. A casing having an opening on one side, and a seat for coupling a flexible member at a position on the outer periphery of the opening, sandwiching the opening of the casing.
A pair of anchoring members are provided, each of which is attached to each of the opposing end surfaces of the underdrain to be connected, with the openings of the casing portions facing each other and a plurality of segments assembled in a cylindrical shape in the circumferential direction of the joint; A short cylindrical shape as a whole is formed between the pair of anchoring members, the end of which is inserted into the housing through the opening so as to be movable within a certain range and cannot be removed from the housing. A load-bearing member is provided; inner and outer flexible members are provided on the inner and outer periphery positions of the load-bearing member and are coupled to each of the seat portions and are provided straddling between the pair of anchoring members; an inner periphery; The flexible member has a wavy portion and a straight portion located on the inner peripheral side of the joint of the wavy portion; A joint for an underdrain, comprising: a flexible outer member extending between retaining members.