JPS5820350B2 - culvert joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the connection of an integral cylindrical culvert made of concrete or steel, and a cylindrical culvert made by assembling a plurality of segments, for use in water supply systems, sewers, public ditches, underground passages, etc. This relates to joints for underdrains used in

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 of the underdrain to be connected. What you did,
Alternatively, a bolt is provided on the back of the flexible member, and the cylindrical flexible member is suspended by the bolt, so that the distortion of the flexible member due to the difference in water pressure between the inside and outside of the culvert is suppressed to a small amount. 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 infiltrates through the gap and deforms the flexible member inward, resulting in decreased durability and destruction of the flexible member, as well as obstructing the flow inside the culvert and There was a problem of damaging the structure.

In order to solve these problems, the applicant of this patent has
An anchoring member having a seat in the center and casings at each of the inner and outer peripheral positions is attached to the opposite end surface of the underdrain to be connected, and a flexible member is arranged between the seats of the anchoring member. At the same time, a large number of rod-shaped load-bearing members are installed in parallel on the inner and outer circumferential positions of this flexible member, with both ends movably inserted into the casing of the anchoring member within a certain range. A joint for an underdrain has been proposed that prevents separation of the joint while allowing displacement of the joint, and prevents harmful deformation of the flexible member.

However, if only the primary lining is required to run the main water pipe through the culvert, the proposed culvert joint will have load-bearing members installed both inside and outside the flexible member. So,
Inevitably, the wall thickness of the joint of the culvert is too thick, which may cause problems in terms of space, and there is also the problem that the load-bearing member itself requires a considerable amount of work to assemble.

In order to suppress this kind of problem, the present invention maintains the previously proposed functions of preventing joint separation of underdrain joints and protecting flexible members, while reducing the number of structural members, especially load-bearing members, etc. The purpose is to provide a joint for an underdrain that solves problems such as space, assembly, and cost by fundamentally changing the configuration.

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, 1 and 1' are a pair of opposing underdrains to be connected.

Although the figure shows concrete cylindrical underdrains as culverts 1 and 1', the invention is not limited to this; it may also be a steel cylindrical one-piece culvert, or a concrete culvert made by assembling cut segments into a cylindrical shape. may be a culvert made of sewage.

Further, although the culvert 1° 1' has a square cross-sectional shape, it is not limited to a square, and may be rectangular, polygonal, circular, horseshoe-shaped, etc.

An underdrain joint A is interposed between 1° and 1' of the underdrain to be connected.

In this case, the joint A of the underdrain is connected to the underdrain 1, such as an auxiliary segment (not shown), which is arranged as necessary in the underdrain 1.1'i section.
, 1' and the underdrain joint A may be interposed between the underdrains 1 and 1'.

Figure 2 shows the cross-sectional configuration of the joint A of the culvert. In the figure, symmetrical members are indicated by adding a dash to the code of one member and adding the code to the other member. Omit explanations as necessary.

In Figure 2, the joint A of the underdrain is connected to the underdrain 1,
A pair of anchoring members 10.10' anchored to the end face of the anchor member 1', a large number of load-bearing members 20 arranged in parallel between the pair of anchoring members 10.10', and only at the outer peripheral position of the load-bearing members 20. A flexible member 30 made of rubber or synthetic resin is provided between the anchoring members 10 and 10', and a flexible member 30 is provided on the outer periphery of the flexible member 30 so as to cover the gap between the two anchoring members 10 and 10'. It has a flexible external water stop member 40 disposed in the.

The anchoring member 10 has a housing part 12 having an opening 11 on one side, and an extending part 13 extending toward the anchoring member 10' facing in the joint axial direction at the outer peripheral position of the housing part 12. It consists of a plurality of divided segments 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 1 side of the housing portion 12.

That is, the connecting part 14 has an end plate 15 extending in the joint axial direction on the end face of the joint circumferential direction of the segment, and by aligning this with the end plate 15 of the connecting part 14 of the adjacent segment, the end plate 15 is formed. This is done by inserting a bolt into the bolt hole 16 that is provided and tightening the segments together.

The joint inner peripheral side constituent members of the housing portion 12 have a structure that can be attached to and detached from the remaining constituent members of the anchoring member 10 at both ends of the segment, and by removing this detachable portion 17, the load-bearing member 20 can be removed. The end portion can be inserted into the housing portion 12.

Furthermore, the attachment/detachment part 17 is configured to be attached across the segments of two adjacent anchoring members 10, and the segments of the adjacent anchoring members 10 are also connected by the attachment/detachment part 17 in the circumferential direction of the joint. .

The anchoring member 10 is attached to the underdrain 1 in the same manner as before.
If the culvert is made of concrete and has a cylindrical body, an anchor (not shown) provided on the end face of the culvert 1 side of the anchoring member 10 may be embedded in the culvert, or the culvert may be made of segments made of concrete or steel. In the case of a culvert, this is done by bolting the anchoring member 10 to the culvert 1.

Anchoring member 10, 10' Load-bearing member 20 installed astride between
has an opening 11.11 at both ends in the housing part 12.12'.
The rod-shaped body is movably inserted within a certain range through the rod and cannot be removed, and the rod-shaped body is made of a plate-shaped body.

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 the height hl of this protrusion 21 is set to the casing portion 12 of the anchoring member 10.
By making the height h2 of the opening 11 smaller than the height h2, it is possible to prevent the joint 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.

In FIG. 2, the interval between the load-bearing members 20, 20 is regulated by attaching a comb-shaped plate piece 22 to the housing portion 12 with bolts, and inserting and supporting an appropriate number of load-bearing members 20 between the comb teeth. This is a diagram showing the case in which it was planned.

However, the spacing between the load-bearing members is not limited to this illustrated example; for example, a joint material (not shown) made of rubber, synthetic resin, asphalt, etc. may be interposed between the load-bearing members 20 and 20 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, and the mutual positional relationship can be determined by inserting the protrusion into the hole. may be regulated, and the interval regulating means may be arbitrarily selected.

At the outer peripheral position of the 20 groups of load-bearing members and the anchoring member 10°10'
Anchoring member 10.
A flexible member 30 made of elastic, rubber, or synthetic resin is disposed over a length of 10'.

The flexible member 30 is made of a short cylindrical body formed, for example, in a corrugated cross-sectional shape so as to be able to sufficiently follow the relative displacement between the underdrains 1 and 1'.

The end of the flexible member 30 is formed in a shape that follows the end surface of the casing 12, and by clamping this end between the casing 12 and the holding plate 31 and tightening it with a bolt 32, the anchor can be secured. Part 1
0 and fixed in a watertight state.

As a result, watertightness between the inside and outside of the underdrains is maintained regardless of the presence or absence of relative displacement between the underdrains 1 and 1'.

As will be described later, the bending due to the pressure difference between the inside and outside of the flexible member 30 is caused by the force-bearing member 20 group and the extension portions 13 of the anchoring members 10, 10'.
and is supported by a flexible external water stop member 40.

At the outer peripheral position of the flexible member 30, both anchoring members 10°10'
A flexible external water stop member 40 made of rubber or synthetic resin is disposed and extends across the extended portion 13 of the holder.

Flexible external water stop member 40B, joint A between underdrains 1 and 1'
During assembly, there is a dam to prevent water leakage and infiltration of earth and sand from the outside, and a provision is made to follow the relative displacement between culverts 1 and 1' to a certain extent after assembly to prevent water and earth from infiltrating. For example, it is made of a short cylindrical body having a linear cross-section along the inner circumferential surface of the cover means, which will be described later.

Note that the cross-sectional shape of the flexible external water stop member 40 is not limited to a linear shape, and may be a short cylindrical body having a waveform cross-section or a cross-sectional shape bent inward of the joint A.

Further, a reinforcing material made of coarsely woven fibers may be embedded in the flexible external water stop member 40.

The end portion of the flexible external water stop member 40 is located at the inner circumferential position of the extension portion 13, and is located in the joint axial direction and opposite to the anchoring member 10'.
The extension part 1 is formed in a shape that follows the end face of the seat part 13a provided at the side, and by holding this end part between the seat part 13a and the holding plate 50 and tightening it with a bolt 51, the extension part 1
3, it is firmly fixed in a watertight state.

Note that the end portion of the flexible external water stop member 40 may be watertightly attached to the inner circumferential surface of the extension portion 13 or to the end surface of the housing portion 12.

A cover means 60 consisting of a thin iron skin plate fixed to the outer periphery of the extension part 13 by welding or the like is installed on the outer periphery of the anchoring member 10, 10' to cover the gap between the two extension parts 13, 13'. It is installed astride the short cylindrical body so as to cover the l.

The cover means 60 is mainly provided to prevent water leakage and infiltration of earth and sand from the outside, similar to the flexible external water stop member 40 described above, when assembling the joint. .1' If a relative displacement occurs between them, the structure is such that it breaks and allows the relative displacement to occur freely.

However, even in this state, the flexible external water-stopping member 40 maintains its strength and can be deformed to follow the displacement, so infiltration of earth and sand and water leakage are prevented. 30 maintains a sound watertight condition inside and outside the culvert.

In the illustrated example, the end portion of the cover means 60 is connected to the anchoring member 1.
Although the anchoring member 10 is flatly connected to the outer peripheral position of the anchoring member 10, it may be bent along the end surface of the anchoring member 10 on the underdrain 1 side in order to further improve watertightness.

The cover means 60 is provided as necessary and may be omitted.

Although FIG. 3 shows another embodiment, parts having configurations similar to those of the previous embodiment are designated by the same reference numerals as those of the previous embodiment, and the explanation thereof will be omitted.

In FIG. 3, a flexible internal water stop member 70 is disposed at the inner circumferential position of the opposing underdrains and at the inner circumferential position of the load-bearing member 20.

The flexible internal water stop member 70 is provided between end plates 71, 71' that are attached to opposite end faces of the anchoring member 10, 10' and extend inwardly of the joint.

The end plate 71.71' is made of mortar attached to the inner peripheral surface of the axial end of the joint near joint A of the underdrain after joint A of the underdrain is assembled.
It also has the function of an end plate for regulating the axial ends 72 and 72' of the concrete (as shown in the diagram), and the anchoring member 10 and 10' is equal to the thickness of the mortar and concrete.
It is provided to protrude inward from the inner peripheral surface.

The flexible internal water stop member 70 is made of an elastic material such as rubber or synthetic resin, and is formed in a shape such that its cross section extends outward from the underdrain 1 so that it can sufficiently follow the relative displacement between the underdrains 1 and 1'. has been done.

Attach the flexible internal water stop member 70 to the end plate 71.71' by applying the cover plate 73.73' and tightening bolts and nuts) 74.74
' to prevent liquid, mud, dirt, etc. from entering the internal space of the underdrain joint A, and to prevent functional deterioration of the underdrain joint A due to such infiltration.

The cover means 60 in this embodiment is a cover-'
It is made of a composite material in which Muro 0-2 is bonded together, and as in the previous embodiment, its role is to prevent water leakage and infiltration of earth and sand from the outside of the underdrain during assembly, and to prevent relative displacement between underdrains 1 and 1' after assembly. If this occurs, the cover rubber 60-2 has the role of breaking and allowing relative displacement freely, and in this case, even if the skin plate 60-1 made of a thin iron plate inside the culvert breaks, the cover rubber 60-2 will not be able to withstand the amount of displacement up to a certain range even if the skin plate 60-1 made of a thin iron plate inside the culvert breaks. It is now possible to follow it well.

Note that the cross-sectional shape of the flexible internal water stop member 70 is not limited to the above-described shape, and may be other shapes such as a wave-shaped cross-section.

It should be noted that the cover means 60 is provided as necessary, and the same one as in the above-mentioned embodiment may be used or it may be omitted, as in the above-mentioned embodiment.

In the joint A of the underdrain having the above configuration, the dark 1.1'
When no relative displacement occurs between them, watertightness is maintained by the flexible member 30, the cover means 60, and the flexible external water stop member 40, and the internal pressure applied to the flexible member 30 is 13, the flexible external water stop member 40, and the cover means 60, and the external pressure of earth and sand, ground water, etc. applied to the cover means 60 is also supported by the extended portion 13.

The water flowing inside the culvert is still smoothed by the flexible internal water stop member 70.

When a relative displacement occurs between the underdrains 1 and 1', the cover means 60 is made of a thin iron skin plate or a composite material of the thin iron skin plate 60-1 and cover rubber 60-2. Therefore, until the displacement reaches a certain amount, the watertight state is maintained by following the displacement, but when the displacement exceeds a certain amount, the cover means 60 breaks, and as the displacement progresses further, the flexible external water stop member 40 also breaks. I will do it.

However, even in this state, the flexible member 30 can sufficiently follow the displacement and deform, so that a sound watertight state inside and outside the culvert is maintained.

During displacement between the underdrains 1 and 1', the force-bearing member 20 acts as follows.

That is, when a displacement occurs between the underdrains 1 and 1' in the axial direction of the underdrains, the tip of the force-bearing member 20 contacts the wall surface of the casing 12 in the case of an adjacent direction, preventing further displacement of the underdrains and separating them. In the case of displacement in the direction shown in FIG.

Furthermore, when a displacement occurs between the underdrains 1 and 1' in the direction perpendicular to the underdrain axis direction, the state in which the load-bearing members 20 groups are arranged in parallel changes
The gap between the sides of the 0.20 comrades becomes small and eventually reaches zero, and further progress of displacement is restricted.

Therefore, by the 20 groups of load-bearing members, the underdrains 1, 1'
Since the displacement between the two ends is limited to a certain amount both in the axial direction of the joint and in the direction perpendicular to the joint axial direction, the flexible member 30 is forced to deform to the extent that it is damaged. Instead, the underdrains 1 and 1' maintain a water-tight state at all times while allowing an appropriate amount of relative displacement.

In addition to this effect, when the load-bearing member 20, the cover means 60, and the flexible external water stop member 40 are damaged, the extension portion 13.13'
It has the function of supporting the flexible member 30 so that the flexible member 30 does not protrude toward the inner circumferential direction of the culvert due to earth, sand, groundwater, etc. that enter through the gap l between them.

There are cases where the external pressure caused by earth and sand becomes quite large, but the load-bearing member 20 is designed to sufficiently withstand it, so it can provide sufficient support and the flexible member 3
Excessive deformation in the direction of the inner periphery of the culvert will not cause any damage or blockage of the flow within the culvert, resulting in no damage to the structures installed within the culvert.

Since the structure is such that the functions and actions described above can be fully achieved by the 20 groups of load-bearing members, the one-stage flexible member 30, and the flexible external water stop member 40, the space in the joint wall thickness direction is greatly saved. Ru.

Along with this, it becomes easier to assemble the underdrain joint, and the amount of excavation of a horizontal shaft for installing the underdrain joint can be reduced accordingly, which brings about effects other than the underdrain joint itself.

Therefore, when using the underdrain joint according to the present invention, the underdrain joint has a housing portion and an extension portion extending in the joint axis direction at the outer peripheral position of the housing portion, and is attached to the end face of the underdrain to be connected. Between the anchoring members to be attached, a load-bearing member whose end portion is movably supported within a certain range and cannot be removed is provided in the housing, and the outer cylinder position of the load-bearing member is provided between the anchoring members to be attached. A flexible member, the end of which is watertightly attached to the anchoring member, is provided at the inner circumferential position of the extending portion, extending between the anchoring members, and both anchoring members are provided at the outer circumferential position of the flexible member. Since a flexible external water-stopping member is provided across the members, even if there is a relative displacement of the underdrain to be connected, it can follow it and ensure the watertightness of the underdrain, and it can also prevent external pressure such as water pressure and external pressure due to intrusion of earth and sand. Even in the past, harmful deformation of the flexible member or the like can be prevented.

However, compared to the case where load-bearing members are placed on both the inner and outer circumferences of the flexible member, it is possible to save space and downsize, as well as simplify assembly, reduce costs, and reduce the amount of horizontal shaft excavation. It is possible to reduce the amount of

When using a joint for a culvert according to the second invention, in addition to the first invention, an end plate extending inward of the culvert is attached to the anchoring member, and an end portion is attached to the end plate at an inner peripheral position of the load-bearing member. Since a flexible internal water stop member is installed across the end plates, not only does forming work become unnecessary when attaching concrete etc. to the culvert frame structure after the culvert joint has been assembled, but also eliminates the need for form work. The flexible internal water stop member prevents mud, dirt, etc. from entering the internal space of the underdrain joint as much as possible, thereby preventing functional deterioration of the underdrain joint.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an underdrain to which the underdrain joint of the present invention is applied, Fig. 2 is an enlarged sectional view taken along the line n-II in Fig. 1, and Fig. 3 is a perspective view of the underdrain joint of the present invention. FIG. 2 is an enlarged sectional view taken along line 1 to 2 in FIG. 1, showing another embodiment. 1.1'...Drainage, A...Joint, 10.10'...Anchoring member, 11.11'...Opening, 12.12'...Casing part, 13.13'... Extension part, 13a, 13a'-
... Seat part, 20... Load-bearing member, 30... Flexible member,
40...Flexible external water stop member, 60...Cover means,
70...Flexible internal water stop member.

Claims (1)

[Claims] 1. A housing having an opening on one side and an extending portion extending in the joint axis direction at an outer peripheral position of the housing, each of which faces the opening of the housing. 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 a plurality of segments assembled in a cylindrical shape in the circumferential direction of the joint; between the pair of anchoring members, a load-bearing member whose end portion is inserted into the housing portion through the opening so as to be movable within a certain range and cannot be removed from the housing portion; at an outer peripheral position of the load-bearing member and extending from the housing portion; a short cylindrical flexible member whose end portions are watertightly attached to the pair of anchoring members and extends between the pair of anchoring members; an outer periphery of the flexible member; The underdrain joint is characterized in that the position is provided with a flexible external water supply member having ends attached to the pair of anchoring members and disposed between the pair of anchoring members. . 2. In the underdrain joint according to claim 1, the flexible external water stop member has an end portion attached to an extending portion of the pair of anchoring members, and It is installed across the extension section. 3 A housing having an opening on one side and an extending portion extending in the joint axis direction at an outer peripheral position of the housing, the openings of the housing facing each other and a plurality of segments. The joint is assembled in a cylindrical shape in the circumferential direction, and includes a pair of anchoring members that are attached to opposite end faces of the underdrain to be connected; between the pair of anchoring members, an end is connected to the opening. A force-bearing member is inserted into the casing portion through the casing portion so as to be movable within a certain range and cannot be removed from the casing portion; at an outer peripheral position of the load-bearing member and an inner periphery of the extension portion of the casing portion. 7A; a short cylindrical flexible member whose end portions are watertightly attached to the pair of anchoring members and extends between the pair of anchoring members; 7A; an outer peripheral position of the flexible member; includes a flexible external water stop member whose ends are attached to the pair of anchoring members and extends between the pair of anchoring members; and a flexible internal water stop member that extends between the pair of end plates and has an end attached to the pair of end plates at an inner peripheral position of the load-bearing member. culvert joint. 4. In the underdrain joint according to claim 3, the flexible external water stop member has an end portion attached to an extending portion of the pair of anchoring members, and Something that is installed between the sections.