JPH10212732A - Flexible joint for manhole structure and manhole structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint which can restrain members in joint parts or end parts of concrete cylindrical bodies which are stacked one upon another, from being damaged even though a strong horizontal external force is exerted to the cylindrical bodies so that the joint parts of the cylindrical bodies are moved, relative to one another, and to restrain leakage of water even though adjacent cylindrical bodies are shifted, relative to each other, and with which a manhole structure can be conveniently constructed, and to provide a manhole structure which does not cause leakage of water. SOLUTION: A flexible joint 5 is composed of a shear-deformable intervening part 11 which can be horizontally shear-deformable, having a ratio between longitudinal spring constant and a searing spring constant of greater than 5, and having a first abutting surface 7 making contact with the lower end of an upper cylindrical body 1, and a second abutting surface 9 making contact with the upper end surface of a lower cylindrical body 1, and fitting parts 13, 15 adapted to be fitted, as necessary, in the upper and lower ends of the cylindrical bodies 1. The intervening part 11 is made of a compound containing a highly rigid material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole structure formed by stacking cylinders, particularly concrete cylinders, mounted on a joint of the cylinders and displacing the cylinders by an earthquake or the like. Damages the end of the cylinder,
The present invention relates to a flexible joint for preventing occurrence of detachment of a mounting portion, and a manhole structure equipped with such a flexible joint.

[0002]

2. Description of the Related Art FIG. 11 illustrates a conventional manhole structure. The concrete cylinders 1 are vertically stacked, and the lowermost cylinder 1 is provided with a connection opening 22 with an underground pipe 21 laid horizontally. The upper and lower ends of each cylindrical body have a shape that can be fitted, and form a joint 3. Each end is connected as it is or with an end face using an adhesive or a sealing material of a known technique to form a joint 3.

[0003] Manhole structures for maintenance and inspection of underground structures accommodating water and sewage passages or transmission lines, telephone lines, etc., are indispensable to have means for preventing water leakage from the surroundings.
In addition, when an earthquake, landslide, etc. occurs, the cylinders made of concrete, etc. that make up the manhole structure are displaced, or the cylinders and mounting parts are damaged, which also causes water leakage, preventing displacement and damage. It is necessary to.

As means for preventing water leakage, Japanese Unexamined Patent Publication No. 7-9087
0, JP-A-7-150581, JP-A-215081
A sealing material disclosed in Japanese Patent No. 47564 is known, and a technique for preventing displacement of a cylindrical body has been proposed.
Japanese Unexamined Patent Publication (Kokai) No. Sho 62-5091 discloses a technique for preventing slippage and sealing.

[0005]

However, the sealing materials disclosed in JP-A-7-90870, JP-A-7-150581 and JP-A-247564, respectively, have a force for displacing the cylinder due to an earthquake or the like. However, it is not possible to prevent the end portion of the cylindrical body from being damaged or detached.

The technique described in Japanese Utility Model Application Laid-Open No. 56-15447 has an effect of preventing slippage, but has no effect of absorbing the action of an external force. Either of the cylinders is destroyed, resulting in water leakage.

The technique described in Japanese Utility Model Publication No. Sho 62-5091 does not cause the cylinder to be dislodged by a small external force and has an excellent sealing effect. However, the cylinder is damaged when a large external force acts as in the above-mentioned technique. It is highly likely to occur. Further, this technique is limited in the shape of the end portion of the cylindrical body and cannot be applied to an existing cylindrical body. It requires a man-hour for closing a nut even during construction, and is a technique that is costly.

[0008] An object of the present invention is to provide a structure in which members and end portions of a cylindrical portion are joined even if a strong horizontal external force acts on the stacked cylindrical members made of concrete or the like to cause relative movement at the joint portion. An object of the present invention is to provide a flexible joint for a manhole structure which is hardly damaged, does not easily leak water even if adjacent cylinders are displaced, and can be constructed by a simple method, and a manhole structure which hardly causes water leakage.

[0009]

According to a first aspect of the present invention, there is provided a manhole structure formed by stacking cylinders made of concrete or the like, wherein a joint portion between the cylinders is provided between upper and lower cylinders. A flexible joint to be mounted, comprising a first contact surface with a lower end of the upper cylinder and a second contact surface with an upper end of the lower cylinder, and capable of being sheared in a horizontal direction. The present invention relates to a flexible joint for a manhole structure having a ratio of longitudinal spring constant / shear spring constant of 5 or more. If the ratio of the vertical spring constant / shear spring constant is 5 or less, if the deformation in the horizontal direction is sufficiently allowed, the settlement due to the load in the vertical direction becomes large, and the object of the present invention cannot be sufficiently achieved. The upper limit of the longitudinal spring constant / shear spring constant ratio is not particularly limited. For example, if a metal plate described later and a rubber-like elastic body are laminated and the number of repetitions thereof is increased, this ratio can be substantially increased. However, considering the stacking height of the cylinders in the manhole and the height of the individual cylinders, this ratio is preferably about 30 or less in terms of cost.

Here, the longitudinal spring constant and the shear spring constant are:
It is a value measured in the same manner as the vertical spring constant, the horizontal spring constant, and the like of the vibration-isolating rubber for a building, and is measured under conditions close to actual use using, for example, a lateral rigidity tester.

[0011] By mounting a flexible joint capable of shearing deformation at the joint of the cylindrical body, the shearing of the flexible joint of the present invention can be performed even if the cylindrical body relatively moves under horizontal force due to an earthquake or the like. As a result of the deformation being absorbed by the deformation, it is possible to prevent breakage of the cylindrical body and the connecting portion and the accompanying water leakage.

A manhole structure constituted by stacking concrete cylinders is generally designed to have a structure in which cylinders are stacked in a plurality of stages, and the load applied to the joint in the lower layer is the weight of the cylinder itself. It is assumed that the total weight of the vehicle such as a large truck and the like is about 30 t. If a large compressive deformation occurs when such a load is applied, the manhole sinks below the ground and a recess is formed on the road, which is not preferable. Therefore, it is desirable that the flexible joint used in the manhole structure has high rigidity in the longitudinal direction, that is, a high longitudinal spring constant. On the other hand, by reducing the horizontal rigidity, that is, the shear spring constant, deformation of the cylindrical body due to relative horizontal movement is allowed. The above requirement is satisfied when the ratio of longitudinal spring constant / shear spring constant is 5 or more.

The horizontal displacement between the road surface and the buried pipe laying layer during an earthquake is expected to be as large as several hundred mm. On the other hand, what is generally called a rubber-like elastic body is 4
A shear deformation of at least 00% is permitted, including the selection of the type of rubber-like elastic body, the selection and design of the type and shape of the high-synthetic material to be used as necessary, and the shape of the shear-deformable portion in particular. By appropriately designing the shape of the flexible joint as a whole, etc., the above-described displacement between the road surface and the buried pipe can be tolerated without causing damage to the cylindrical body and the joint.

The flexible joint according to the present invention has a second contact surface between a first contact surface of the upper cylinder with the lower end thereof and an upper end of the lower cylinder.
It is preferable to include a shear-deformable holding portion having a contact surface, and by adopting such a configuration,
When the fitting portion is formed on the end face of the existing tubular body, the shape of the first and second contact surfaces of the flexible joint matches the shape of the fitting portion of the tubular body, A fitting portion is also formed on the flexible joint so that the flexible joint can be mounted in a fitted state with the cylindrical body. When the end surface of the cylindrical body is flat, the first and second contact surfaces extending to the side surface of the end of the cylindrical body are formed into a flange-like portion, so that the cylindrical body can be mounted in a fitted state. .

The upper end and the lower end of the cylinder to be connected and the flexible joint of the present invention are particularly provided that they are mounted so as not to be disconnected when subjected to a force for relatively moving the cylinder. The mounting method is not limited, and may be bonded using an adhesive. However, as described above, the fitting portion using the fitting shape of the end portion of the existing concrete tubular body, the end of the tubular body is used. It is preferable that the flexible joint is provided with a flange-shaped body for housing the portion or both of them, and has an effect of preventing the tubular body and the flexible joint from being detached during shear deformation. If the fitting and the use of the adhesive are performed together, a certain effect can be expected.

[0016] The holding portion of the flexible joint according to the present invention includes at least one high-rigidity material, preferably a metal material, a fiber material, provided along the first contact surface and the second contact surface.
At least one material selected from resin materials
Preferably, one or more layers of the high-rigidity material are provided in a layered form. Thus, the flexible joint in which the high-rigidity material-containing layer is disposed along the shear deformation direction has the effect of increasing the longitudinal spring constant while keeping the shear spring constant low. In particular, by forming a high-rigidity material in a plate shape or the like and laminating with a rubber-like elastic body interposed therebetween, the longitudinal spring constant can be significantly increased without significantly changing the shear spring constant.

The present invention also relates to a manhole structure equipped with the above-described flexible joint, which is attached to the flexible joint and the cylinder by bonding, fitting, or both. Further, the flexible joint may be attached to all joints, or may be used only for necessary parts, particularly for joining a lower cylinder. When attaching flexible joints to all joints, it is not necessary to attach flexible joints all having the same structure, and a flexible joint having a larger vertical spring constant / shear spring constant in a lower layer is required. It is desirable to use.

[0018]

Embodiments of the present invention will be described. (1) Shape and Structure In the manhole structure of the present invention, a flexible joint 5 is used for the joint 3 as shown in FIG. This figure shows an example in which the flexible joint 5 of the present invention is used for all joints.

Next, the structure of the flexible joint will be specifically described. FIG. 2 is an enlarged cross-sectional view of a joint where the flexible joint 5 is mounted. This flexible joint is an example in which the flexible joint 5 uses only a rubber-like elastic body, and the first contact surface 7 with the lower end surface of the cylindrical body 1 located on the upper side and the cylindrical body located on the lower side. A holding portion 11 having a second contact surface 9 with the upper end surface of the holding member 1 and having a shear-deformable portion having a thickness of x;
Fitting portions 13 (concave portions), 15 fitted to the upper end and lower end of the
(Projections). The shapes of the fitting portions 13 and 15 use the fitting shape of the existing cylindrical body as it is, and there is no need to change the shape of the cylindrical body in order to use the flexible joint 5 of the present invention.

The flexible joint 5 shown in FIG. 3 is provided with a flange 17 in addition to the shape shown in FIG. 2, and the flange 17 is provided on the inner surface or the outer surface of the end of the upper and lower cylinders. Is formed so as to contact at least one surface thereof. In addition, the collar 17
May be formed over the entire circumference or may be partially provided.

The clamping portion 11 of the flexible joint 5 of the present invention
It is preferable that the high-rigidity material has a structure in which a high-rigidity material is compounded in the circumferential direction along the end surface of the cylindrical body 1, and a high-rigidity material such as a long fiber, a woven fabric, a nonwoven fabric, or a plate-like material can be used. These high-rigidity materials may be provided in all circumferential directions, or may be provided partially. When used over the entire circumference, the cost may be high, and when a steel material is used, the weight of the flexible joint 5 may increase, and handling may be difficult.

FIG. 4 shows an example in which the tubular body 1 has a flange-shaped portion 17 in contact with the inner and outer peripheral surfaces thereof, and the sandwiching portion 11 is formed in a layer shape by using a fibrous material 18 as a highly rigid material. The cross section is shown. FIG. 5A shows an example in which the steel plate 19 is used as a highly rigid material and is processed into a cross-sectional shape along the irregularities formed in the cylindrical body 1 and integrated with the elastic material.
9A is a cross-sectional view showing an example in which two types of steel plates 19b having a shape extending from the end surface of the cylinder to the inner peripheral surface and a steel plate 19b extending from the end surface of the cylinder to the outer peripheral surface are used. The steel plate is shown in FIG.
In addition to the two layers shown in FIG. 5B, one or more layers may be provided so as not to hinder the shear deformation. Fiber material 1
8 and the steel plates 19, 19a and 19b allow the sandwiching portion 11 to be sheared while strengthening the fitting with the end of the cylindrical body, and the effect of increasing the longitudinal rigidity. It has the function of preventing the cylinder 1 from being displaced and dislodged by a horizontal force. In FIG. 4, the layer of the fiber material 18 is provided at the center, but it may be formed as a thin fiber layer such as the steel sheet of FIG. 5 at intervals, and a part of FIG. It may be extended to the flange 17 like steel plates 19a and 19b. As shown in FIG. 6, the steel plate 19 configured along the side surface of the end of the cylindrical body in the flange portion 17 is partially provided on the periphery if it has an action of preventing the cylindrical body 1 from coming off. May be. The above-described flexible joint obtained by compounding a high-rigidity material to increase the vertical rigidity is preferably used for a lower layer joint having a particularly large vertical load even in a manhole structure.

FIGS. 7A and 7B show an example of the flexible joint 5 of the present invention applied to a concrete cylinder having another end structure. In addition, the steel plate 19 which is a high-rigidity material in FIG. 7A shows the structure of the yy section in FIG.

The first joint surface 7 and the second joint surface 7 of the flexible joint of the present invention
The abutment surfaces 9 are preferably each provided with at least one ridge 20, examples of which are shown in FIG. 7b. In this figure, the ridges 20 are indicated by dotted lines, but when they are actually mounted, they are compressed to have a shape that follows the shape of the cylindrical body end surface. The ridges 20 are preferably provided continuously in the circumferential direction, have high flexibility, and are deformed in accordance with the roughness (small irregularities) of the end surface of the cylindrical body 1 made of concrete or the like to provide a sealing effect. Has the effect of increasing the It is preferable that the ridge 20 is also formed of a rubber-like elastic body.

As another embodiment, at least a part of the fitting portions 13, 15 and the flange portion 17 of the holding portion 11 forming the second contact surface has a configuration formed of a high hardness rubber material. You may. FIG. 8 shows an example in which a part of the flexible joint 5 having the same shape as that shown in FIG. This configuration also increases the strength of the fitting portion 15 to allow a larger shear strain. It is particularly preferable to use the high hardness rubber material 6 in a fitting portion that fits into a concave portion at the end of the cylindrical body as shown in FIG. 8 for the purpose of allowing a large shear strain.

(Alternative Embodiment) In the above-described embodiment, an example is shown in which the holding portion 11 is provided with a layer of high-rigidity material in the lateral direction. However, as shown in FIGS. Part 11
However, a plurality of reinforcing rods P made of a high-rigidity material may be provided in the inside thereof in a vertical posture.

According to such a configuration, the bar-shaped body P acts as a reinforcing material against a load from above, while the holding part 11 can be sheared and deformed in the horizontal direction due to the inclination of the bar-shaped body P. Can reduce compression deformation. Therefore, as shown in FIGS. 9 and 10, it is desirable that both ends of the rod-shaped body P are in contact with the upper cylindrical body 1 in a use state, but the reinforcing member is only used when the load from above becomes excessive. It may be configured such that both ends of the rod-shaped body P do not come into contact with the cylindrical body 1 in the use state so as to function as. Further, the rod-shaped body P may be in a loosely fitted state with respect to the holding portion 11, whereby the restraining force when the rod-shaped body P is inclined can be reduced, and the horizontal shear deformation can be more easily performed. . Further, a small space may be provided around the rod P in order to more reliably reduce the restraining force when the rod P is inclined.

Further, the rod-shaped body P may be rigidly connected to the lower cylindrical body 1. In this case, the elastic body such as spring steel is used as the rod-shaped body P, so that the holding portion 11 is subjected to horizontal shear deformation. At this time, the elastic restoring force of the bent rod-shaped body P can improve the restoring force of shear deformation. However, in this case, it is preferable to make the rod-shaped body P thinner or the like so that the shearing deformation of the sandwiching portion 11 is not so much restricted.

(2) Material, manufacturing method, etc. The flexible joint of the present invention may be composed of only a rubber-like elastic body, but a high-rigidity material and a high-hardness rubber are used for the rubber-like elastic body. It is preferable to have a structure in which at least one or more materials selected from the materials are combined, and it is particularly preferable to have a structure in which a high-rigidity material and a high-hardness rubber material are layered and laminated with a rubber-like elastic body as described above. .

The rubbery elastic material mentioned here is a material having a hardness of 40 to 90 as measured by a JIS-A hardness meter, and may be either a thermoplastic elastomer or a thermosetting elastomer. Considering the requirement that the strain should be small, a thermosetting elastomer having a crosslinked molecular structure is a preferred material.

As such a thermosetting elastomer, it is preferable to use a rubber material known to those skilled in the art, such as polychloroprene rubber, polyisoprene rubber, EPDM,
One or more kinds are selected and used from a synthetic rubber such as polybutadiene rubber, NBR and SBR and a natural rubber as needed. These rubber materials are processed by a method known to those skilled in the art, and are formed into a final shape by an injection molding method, a transfer molding method, a compression molding method, or the like.

The high hardness rubber material has a JIS-A hardness of 9
0 or more rubber material, using a material selected from the synthetic rubbers and natural rubbers exemplified as the above-described thermosetting elastomers, and in particular, by increasing the crosslink density or compounding a large amount of fillers, to obtain a high-hardness material. Is done. The high-hardness rubber material and the rubber-like elastic material are preferably integrated by so-called vulcanization bonding, and in order to obtain strong adhesion, the same raw rubber is used for the rubber-like elastic material and the high-hardness rubber material. Is a particularly preferred embodiment.

Specific examples of the fiber material exemplified as the high rigidity material include organic fibers such as nylon, polyester, polyaramid and rayon, mineral fibers such as glass fiber, and the like.
Examples thereof include metal fibers such as steel cords and other carbon fibers. These fiber materials are used in a form in which woven fabric, nonwoven fabric, sliver, tow sheet, and twisted fiber are arranged. These fibers are used as they are, or are subjected to a pretreatment using a reactive reagent or a resin material to improve the adhesiveness with rubber, and if necessary, are subjected to a topping treatment referred to by those skilled in the art. It is molded integrally with the material to be formed.

Examples of the metal material exemplified as the high rigidity material include SUS, brass, aluminum and the like in addition to the steel plate described above. If necessary, a pretreatment well known to those skilled in the art, that is, A blast treatment, a primer treatment, and an adhesive treatment for vulcanization bonding are performed, and the resultant is integrated with the rubber material to be molded as a flexible joint.

Examples of the resin material exemplified as the highly rigid material include nylons, polyester resins such as PET, and A
So-called engineering plastics such as BS and Noryl resin are preferable materials having high rigidity. Further, a resin material called super engineering plastic is also preferable. The above-described high elastic modulus rubber material is also preferable. The rubber material may be formed into a sheet shape in an unvulcanized state, laminated with an unvulcanized rubber-like elastic body, and then vulcanized to form a laminated state.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a cross-sectional structure of a manhole structure mounted with a flexible joint of the present invention mounted thereon.

FIG. 2 is a diagram illustrating a cross-sectional structure of a flexible joint composed of only a rubber-like elastic body;

FIG. 3 is a view exemplifying a cross-sectional structure of a flexible joint which is constituted only of a rubber-like elastic body and has a flange portion.

FIG. 4 is a diagram showing a cross section of an example of a flexible joint including a layer of a fiber material disposed along the end surface of a tubular body in the center of a holding portion.

FIG. 5 is a diagram showing a cross section of an example of a flexible joint in which a steel plate is made of a high-rigidity material, and which is disposed on a sandwiching portion along the upper and lower cylindrical body end surfaces.

FIG. 6 is a diagram showing an example in which a steel plate is used as a high-rigidity material and the steel plate is partially provided on the circumference of a cylindrical body having a circular cross section.

FIG. 7 is a diagram showing an example of a flexible joint attached to a cylindrical body in which fitting is performed with (a) a flat end face and (b) a stepped end structure. In (a), a steel plate is provided.

FIG. 8 is a diagram illustrating a cross-sectional structure of a flexible joint using a highly elastic rubber material for a part of the flexible joint of FIG. 3;

FIG. 9 is a diagram exemplifying a cross section of a joint where a flexible joint having a vertically extending rod-like body is mounted.

FIG. 10 is a view exemplifying a disposition state of a rod-shaped body of a flexible joint in which the rod-shaped body is erected in a vertical direction.

FIG. 11 illustrates a cross-sectional structure of a conventional manhole structure formed by stacking concrete cylinders.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 5 Flexible joint 7 1st contact surface 9 2nd contact surface 11 Nipping part 13 Fitting part (depression) 15 Fitting part (convex part)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norihiko Tatsumi 10th Tenjincho, Shinjuku-ku, Tokyo Yasumura Building 2F Toyo Tire & Rubber Co., Ltd.

Claims (3)

[Claims] 1. A manhole structure formed by stacking cylindrical bodies, a flexible joint attached to a joint of the cylindrical bodies, wherein a first contact surface with a lower end of the upper cylindrical body. And a second abutment surface between the lower end and the upper end of the cylindrical body, which can be sheared horizontally in the mounted state, and has a ratio of longitudinal spring constant / shear spring constant of 5 or more. Sex fittings. 2. The holding portion includes at least one or more highly rigid materials selected from a metal material, a fiber material, and a resin material disposed along the first contact surface and the second contact surface. 1
The flexible joint for a manhole structure according to claim 1, wherein the flexible joint includes one. 3. A manhole structure to which the flexible joint for manhole structure according to claim 1 is attached.