JP2854563B2 - Culvert fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
It relates to the joint of a culvert such as a cave.

[0002]

2. Description of the Related Art In a conventional culvert joint, cylindrical frames are anchored to opposite ends of a pair of cylindrical culverts opposed to each other, and a joint made of an elastic material such as rubber or synthetic resin is used. Both ends of the tubular flexible water blocking member are attached to the inner peripheral surfaces of the two frame members facing each other in a watertight manner to absorb the relative displacement of the culvert accompanying uneven settlement of the ground, There is a type in which water is stopped between these culverts.

[0003]

Around the culvert, a sediment pressure acts in addition to the external water pressure, and the external pressure acting on the underground structure is usually 1 kg / cm ^{2 to 2} k.
g / cm ² , but recently the mounting position is deeper in the soil, and the external pressure tends to be higher at ³ to 5 kg / cm ² .

[0004] For this reason, in the above-mentioned type of culvert joint, if, for example, seismic motion causes extension displacement between the culverts or uneven ground subsidence causing large relative displacement between the culverts, the relative displacement is caused by the relative displacement. Outside water and earth and sand around the culvert enter the concave portion of the flexible water blocking member from the gap between the joint material and the end face of the culvert.

[0005] Even if earth and sand enter the concave portion of the flexible water-stopping member, it is prevented by the flexible water-stopping member, so that there is no problem such as intrusion into the culvert. The earth and sand that has entered the recess gradually accumulates and solidifies, thereby restricting the movement of the constricted portion of the flexible water blocking member. Therefore, if relative displacement occurs between the culverts due to seismic motion or the like in this state, the deposited sediment restricts the behavior of the flexible water blocking member, and cannot expand and contract following the relative displacement of the culvert. If the flexible water blocking member cannot expand and contract, the internal stress of the flexible water blocking member increases with the expansion of the relative displacement between the culverts, and stress acts on the anchoring flange portion of the flexible water blocking member to cause water leakage. There is a risk. Since the flexible water blocking member is used by being buried in the soil together with the culvert, it is extremely difficult to examine the sedimentation state of the sediment in the concave portion. It is important not to deposit earth and sand in the water member recess.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional culvert, and even when a large relative displacement occurs between the culverts due to elongation or uneven settlement, sediment is formed in the concave portion of the flexible water blocking member. It is intended to provide a culvert joint that does not accumulate.

[0007]

In order to achieve the above object of the present invention, a culvert joint according to the first aspect of the present invention comprises:
It is a flexible joint made of a flexible material such as rubber or synthetic resin, formed as a short tube as a whole, and arranged across a joint between the ends of a pair of opposed culverts, It is arranged on the outer peripheral side of the culvert, has extension member anchoring water stopping portions fixed to the ends of the culvert at both ends, and is formed between the extending member anchoring water stopping portions in a direction in which the culverts are separated from each other. A flexible extension member having an extension portion that extends in accordance with the displacement when displaced, and a load-bearing member anchoring / water-stopping portion provided on an inner peripheral side of the flexible extension member and fixed to an end of the culvert. A flexible bearing member formed at both ends and having a bulging portion formed between the pair of bulging base lines and bulging in the radial direction of the joint from the pair of bulging base lines; The width of the portion is larger than the distance between the bulging base lines of the bulging portion of the flexible bearing member.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the bulging portion of the flexible bearing member bulges toward the inner peripheral side of the joint. A plurality of fluid permeable holes are formed in a portion of the extension portion of the flexible extension member that faces the bulging portion of the flexible load-bearing member.

The joint of a culvert according to a third aspect of the present invention, in addition to the structure of the second aspect, further comprises a water stopping portion for anchoring the extension member of the flexible extension member and a water stopping portion for anchoring the bearing member of the flexible bearing member. It is characterized by being formed integrally with the part.

According to a fourth aspect of the present invention, in addition to the structure of the second aspect, the joint for stopping the extension member of the flexible extension member and the water for stopping the anchorage of the flexible member are provided. Each part is formed in a flange shape extending in the radial direction of the joint,
It is characterized by being bolted to each other.

[0011]

According to the first aspect of the present invention, the joint is divided into a flexible extension member and a flexible load-bearing member, and the width of the extension portion of the flexible extension member is set to the bulging base line of the bulging portion of the flexible load-bearing member. Since the distance between the culverts is larger than the distance between the culverts when the culvert is displaced in the direction in which the culverts are moved away from each other, it is possible to extend the culverts in a direction away from each other. It is possible to extend following the displacement, and even if the bulging portion of the flexible bearing member expands until it becomes substantially linear, the extending portion is not cut. Therefore, it is possible to prevent the earth and sand from entering the dent of the bulging portion and accumulating to the allowable limit of the extension of the joint that expands until the bulging portion becomes linear.

Further, according to the present invention, since the width of the extension portion can be made sufficiently large, a large load does not locally concentrate when the extension portion is extended, and therefore, a large tensile force is applied to the anchoring water stop portion of the joint. Is not applied, the force for pulling out the anchoring water-stop portion of the joint from the construction groove is reduced, and the water-stopping function of the joint is not substantially reduced.

According to the second aspect of the present invention, the bulging portion bulges toward the inner peripheral side of the joint, and a plurality of bulging portions are provided in a portion of the extending portion of the flexible extending member which faces the bulging portion. Since the fluid permeable hole is formed, pressure such as external water pressure is directly applied to the bulging portion of the flexible member through the fluid permeable hole,
Since the external water pressure is not applied to the extension portion of the flexible extension member, the force for pulling out the anchoring water stop portion of the flexible extension member from the construction groove is reduced by that amount, thereby preventing a decrease in the water stopping function of the joint. be able to.

According to the third aspect of the present invention, the extension member anchoring and stopping water portion and the bearing member anchoring and stopping water portion are integrally formed. Become.

According to the fourth aspect of the present invention, the extension member anchoring water stopping portion and the bearing member anchoring water stopping portion are each formed in a flange shape extending in the radial direction of the joint, and are bolted to each other. As a result, both anchoring water stopping portions are strongly reinforced.

A frame is disposed outside the flange-shaped water anchoring portion in the axial direction of the joint, and the water anchoring portion is fixed to the frame by a bolt inserted into a bolt hole formed in the frame. Therefore, the present invention can be applied to a joint with a frame.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 9 show an embodiment in which the present invention is applied to a concrete casting type box culvert. FIG. 1 is a sectional view taken along the line II of FIG. FIG. 3 is a cross-sectional view showing an example of a flexible extension member, FIGS. 4 and 5 are cross-sectional views showing an example of a flexible load-bearing member, and FIGS. 8 and 9 are cross-sectional views showing the state of the joint when the extension displacement and the unequal settlement occur between the opposing culverts.

In FIG. 2, reference numeral 1 denotes a culvert joint according to the present invention, and reference numerals 2 and 2 'denote culverts composed of concrete-cast box culverts. This pair of culverts 2, 2 '
Are connected by the joint 1 according to the present invention.

The joint 1 of the culvert, as shown in FIG.
An inclined portion 3 is provided on the outer peripheral side of the culvert 2, 2 '.
3 'is formed. The joint between the culverts 2 and 2 'is filled with a joint material 4 made of sponge rubber or the like.

A flexible joint 1 made of a flexible elastic material such as rubber or synthetic resin and formed in a short cylindrical shape as a whole is provided so as to straddle the inclined portions 3 and 3 'of the culverts 2 and 2'. Have been. The joint 1 is composed of two separate components, a flexible extension member 5 and a flexible load-bearing member 6.

The flexible extension member 5 has a flat outer peripheral surface 5 which forms substantially the same surface as the outer peripheral surfaces 2a, 2a 'of the culverts 2, 2'.
The extension members anchor and stop portions 5b and 5b 'which are embedded and fixed at the ends of the culverts 2 and 2' are provided at both ends. The anchoring water stopping portions 5b, 5b are projecting portions 5c, 5c vertically protruding from the respective ends of the flexible extension member 5 toward the inner peripheral side of the joint, and the water stopping side having a circular cross section integrally formed at the tip thereof. Valve 5
d and 5d. Extension member anchoring water stopping portions 5b, 5b
Between them, there is formed an extension 5e which extends when the culverts 2, 2 'are displaced in a direction away from each other, following the displacement. The bulging portion 6a of the middle flexible load-bearing member 6 in the extending portion 5e
A plurality of water holes (air holes) 7 are formed in a side portion or an upper portion facing (described later).

The flexible bearing member 6 is provided on the inner peripheral side of the flexible extension member 5 as a member separate from the flexible extension member 5. The flexible bearing member 6 is provided at both ends with bearing member anchoring water stopping portions 6b, 6b buried and fixed at the ends of the culverts 2, 2 'in the axial direction of the joints of the extending member anchoring water stopping portions 5b, 5b. ing. The anchoring water stopping portions 6b, 6b are projecting portions 6c, 6c projecting obliquely from each end of the flexible member 6 to the inner peripheral side of the joint.
And water-stop side valves 6d, 6d having a circular cross section and integrally formed at the tip thereof.

On the inner side in the joint axial direction of the anchoring / water-stopping portions 6b, 6b, it is disposed so as to be in contact with the inner peripheral surface of the extension portion 5e of the flexible extension member 5, and supports the extension portion 5e against external water pressure. Elongated portion support portions 6e, 6e, and a pair of bulging baselines 8, 8 located at the terminal edge on the inner side in the joint axial direction of the extended portion support portions 6e, 6e.
A bulging portion 6a bulging in the radial direction of the joint is formed from (a line extending in the circumferential direction on the inner peripheral side of the flexible member 6 from which the bulging portion 6a starts bulging). The bulging portion 6a is disposed so as to be supported by the inclined surfaces 3, 3 'of the culverts 2, 2', and has a substantially V-shaped cross section.

A pair of positioning ridges 5f, 5f are formed on the inner peripheral surface of the extension portion 5e of the flexible extension member 5 so as to fit inside the bulging base lines 8, 8 of the flexible bearing member 6 in the joint axial direction. The extension portion 5 is disposed so as to be supported by the extension portion support portions 6e, 6e. In order to facilitate the construction, the extension supporting portions 6e, 6e and the extension 5e may be temporarily bonded with an adhesive. The width of the extension portion 5e of the flexible extension member 5, that is, the width W of the portion contributing to the extension of the flexible extension member, is the distance D between the swelling base lines 8 of the bulging portion 6a of the flexible bearing member 6.
And in the illustrated embodiment, W has a size that is at least three times greater than D.

As the material of the flexible elongating member 5, a material having sufficient flexibility, elasticity and strength and having a relatively large elongation is preferable. As the material of the flexible bearing member 6, a material having sufficient flexibility, elasticity, and strength but having a lower elongation ratio than the flexible elongating member 5 is preferable. As shown in FIG. 5, a reinforcing cloth 6g may be embedded in the flexible bearing member 6 to increase its strength. The reinforcing cloth 6g may not be provided when the material of the load-bearing member 6 has a sufficient strength.

Next, the operation of the joint having the above configuration will be described. When installing joints and in normal times when there is no displacement such as extension displacement (displacement in the direction in which the culvert separates) between culverts,
The joint 1 is in the state of FIG. 1, the flexible extension member 5 is in the non-extension state, and the flat outer peripheral surface 5a causes the culvert 2, 2 '.
The joint 1 having the same outer peripheral surface as the outer peripheral surfaces 2a and 2a 'is formed.

When a strong external water pressure is applied to the culverts 2 and 2 ', the water outside the culverts 2 and 2' is formed by the bulging portions 6a of the flexible members 6 through the water holes 7. After flowing into the space, the external water pressure of the culvert is directly applied to the bulging portion 6a, and the external water pressure is not directly applied to the extending portion 5e of the flexible extension member 5.

When the extension displacement occurs between the culverts 2 and 2 'as shown in FIG. 6, the extension 5e of the flexible extension member 5 extends following the displacement between the culverts. Then, as shown in FIG. 7, when the bulging portion 6a is opened to an extreme position where the bulging portion 6a becomes substantially linear, in the present invention, the width W of the extending portion 5e is changed to the bulging portion 6a.
Is sufficiently larger than the distance D between the swelling base lines 8, 8, so that the elongation percentage of the swelling portion 5 e can be made relatively small and the swelling portion 6 a has a substantially linear expansion limit. At this point, by setting the elongation percentage of the elongated portion 5e to be equal to or less than the breaking limit value, it is possible to prevent the elongated portion 5e from being cut. Therefore, even in the case of FIG. 7 in which the bulging portion 6a expands linearly, the extending portion 5e is not cut, so that it is possible to prevent earth and sand from invading and accumulating in the dent of the bulging portion 6a.

Further, even if the extension displacement and the unequal settlement occur between the culverts 2 and 2 ', as shown in FIG.
e can extend following the displacement between the culverts.
As shown in Fig. 7, even at the extension allowable limit point of the joint where the bulging portion 6a expands substantially linearly, it is possible to prevent earth and sand from entering the recess of the bulging portion 6e without cutting the extending portion 5e. Can be maintained.

FIG. 10 is a partial sectional view showing another embodiment of the present invention. In the drawings following FIG. 10, components that are functionally the same as the embodiment of FIG. 1 are denoted by the same reference numerals as in FIG. 1,
The description is omitted.

The embodiment shown in FIG. 10 is suitable for a case where the displacement between the culverts which needs to be dealt with is relatively small. After the flexible extension member 5 and the flexible bearing member 6 are separately extruded and formed,
At the time of vulcanization, the surfaces of the two members 5 and 6 are wiped and adhered at a portion indicated by a dotted line 14 with a solvent to integrate the two members 5 and 6 together. As a result, the main anchoring / water stopping function of the flexible extension member 5 is also used by the anchoring / water stopping portion 6b of the flexible endurable member 6, and the extension member anchoring / water stopping portion 5b of the flexible extending member 5 is auxiliary. The anchoring and stopping water function is achieved.

According to the structure shown in FIG. 10, since the entire joint has an integral structure, the construction is simpler and easier than when the flexible extension member 5 and the flexible bearing member 6 are separately constructed. However, as compared with the embodiment of FIG.
Since the length of e becomes shorter, the range that can follow the displacement of the joint becomes shorter accordingly.

FIG. 11 is a partial sectional view showing another embodiment of the present invention. In this embodiment, as in the embodiment shown in FIG. 10, the flexible extension member 5 and the flexible bearing member 6 are joined together by an anchoring / water-stopping portion and integrated. In this embodiment,
The anchoring / water stopping part of both members 5 and 6 is completely common anchoring / water stopping part 1
0. The anchoring / water stopping part 10 includes a side valve 10a for stopping water. This embodiment is suitable for the case where the wall thickness of the culverts 2 and 2 'is thin, and enables sufficient displacement regardless of the relatively thin wall thickness.
The flexible bearing member 6 includes two rows of bulging portions 6a-1, 6a-2 and 3
The extension member support portions 6e-1, 6e-2, and 6e-3 are provided in a row, and the flexible extension member 5 also has two rows of water passage holes 7-1 and 7-2.
It has.

FIG. 12 is a partial sectional view showing another embodiment of the present invention. In this embodiment, the flexible extension member 5
The projecting portion 5c of the anchoring water stopping portion 5b and the projecting portion 6c of the anchoring water stopping portion 6b of the flexible bearing member 6 are each formed in a flange shape, and are bolted to each other by bolts 12 and nuts 13. . With this configuration, both anchor landing / stopping portions 5b,
6b is strongly reinforced.

A frame (not shown) is arranged outside the flange-like projection 5c of the extension member anchoring / water-stopping portion 5b in the joint axial direction, and bolts 12 are drilled into both the projections 6c, 5c and this frame. The two anchoring water stopping portions 5b and 6b can be fixed to the frame by penetrating the bolt holes provided and tightening with the nuts 13. Thus, the present invention can be applied not only to concrete casting type culverts but also to precast box culverts and the like. It can also be applied to a stationary culvert.

[0036]

As described above, according to the first aspect of the present invention, the joint is divided into the flexible extension member and the flexible bearing member, and the width of the extending portion of the flexible extension member is the flexible bearing member. The length of the bulge is larger than the distance between the bulge baselines, so by making the width of the bulge sufficiently large, many bulges are possible, thereby displacing the culvert in the direction away from each other. In this case, the extension portion can extend following the displacement between the culverts, and the extension portion does not break even when the bulging portion of the flexible load-bearing member expands until it becomes substantially linear.
Therefore, it is possible to prevent the earth and sand from entering the dent of the bulging portion and accumulating to the allowable limit of the extension of the joint that expands until the bulging portion becomes linear.

Further, according to the present invention, since the width of the extending portion can be made sufficiently large, a large load is not locally concentrated when the extending portion is extended, and therefore a large tensile force is applied to the anchoring water stop portion of the joint. Is not applied, the force for pulling out the anchoring water-stop portion of the joint from the construction groove is reduced, and the water-stopping function of the joint is not substantially reduced.

Further, according to the second aspect of the present invention, the bulging portion bulges toward the inner peripheral side of the joint, and a plurality of bulging portions are provided in a portion of the extending portion of the flexible extension member facing the bulging portion. Since the fluid permeable hole is formed, pressure such as external water pressure is directly applied to the bulging portion of the flexible member through the fluid permeable hole,
Since the external water pressure is not applied to the extension portion of the flexible extension member, the force for pulling out the anchoring water stop portion of the flexible extension member from the construction groove is reduced by that amount, thereby preventing a decrease in the water stopping function of the joint. be able to.

According to the third aspect of the present invention, the extension member anchoring and stopping water portion and the bearing member anchoring and stopping water portion are integrally formed. Become.

According to the fourth aspect of the present invention, the extension member anchoring water stop portion and the bearing member anchoring water stop portion are each formed in a flange shape extending in the radial direction of the joint, and are bolted to each other. As a result, both anchoring water stopping portions are strongly reinforced.

Further, a frame is disposed on the outer side in the axial direction of the joint between the flange-shaped water anchoring portions, and the water anchoring portions are fixed to the frame by bolts inserted into bolt holes formed in the frame. Therefore, the present invention can be applied to a joint with a frame.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of an inner surface smooth joint for a culvert according to the present invention.

FIG. 2 is a perspective view of a box culvert to which the joint of FIG. 1 is applied.

FIG. 3 is a sectional view showing an example of a flexible extension member.

FIG. 4 is a cross-sectional view showing an example of a flexible bearing member.

FIG. 5 is a cross-sectional view showing another example of a flexible bearing member.

FIG. 6 is a sectional view showing an intermediate state of elongation displacement of the joint of the embodiment.

FIG. 7 is a cross-sectional view showing a limit state of extension displacement of the joint of the embodiment.

FIG. 8 is a cross-sectional view showing an intermediate state between elongation and unequal settlement complex displacement of the joint of the embodiment.

FIG. 9 is a cross-sectional view showing an extreme state of the combined displacement of the joint and the elongation and unequal settlement of the same embodiment.

FIG. 10 is a partial sectional view showing another embodiment of the joint of the present invention.

FIG. 11 is a partial sectional view showing another embodiment of the joint of the present invention.

FIG. 12 is a partial sectional view showing another embodiment of the joint of the present invention.

[Explanation of symbols]

 Reference Signs List 5 flexible extension member 5e extension portion 6 flexible bearing member 6a bulging portion

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03F 3/04 E21D 11/04

Claims (4)

(57) [Claims] 1. A flexible member made of a flexible material such as rubber or synthetic resin and formed in a short cylindrical shape as a whole, and is disposed across a joint between ends of a pair of opposed culverts. A joint, which is disposed on the outer peripheral side of the culvert and has an extension member anchoring water stop portion fixed to an end of the culvert at both ends, and the culvert is formed between the extension member anchor water stopping portions. A flexible extension member having an extension portion extending in accordance with the displacement when displaced in a direction away from the flexible extension member, and a load-bearing member anchor provided on the inner peripheral side of the flexible extension member and fixed to an end of the culvert. A flexible bearing member having swelling portions at both ends and having a swelling portion formed between the pair of swelling baselines and swelling in the radial direction of the joint formed between the pair of swelling members. The width of the extension portion of the flexible extension member is larger than the distance between the swelling base lines of the swelling portion of the flexible load-bearing member. And culvert fittings. 2. The bulging portion of the flexible bearing member bulges toward the inner peripheral side of the joint, and the bulging portion of the flexible bearing member is provided in the extending portion of the flexible stretching member. 2. A plurality of fluid permeable holes are formed in a portion opposed to the fluid passage.
The described culvert fitting. 3. The anchor member according to claim 1, wherein the water-stop portion of the flexible member and the water-stop portion of the flexible member are integrally formed. 2. The culvert joint according to 2. 4. The water-stopping portion for anchoring the extension member of the flexible extension member and the water-stopping portion for anchoring the load-bearing member of the flexible bearing member are each formed in a flange shape extending in a radial direction of the joint. 3. The joint of a culvert according to claim 2, wherein the joints are bolted to each other.