JP3527964B2 - Flexible joint - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint used for joints of concrete boxes, steel structure boxes, pipes and the like.

[0002]

2. Description of the Related Art For a flexible joint of a large box or a floating box which is continuously constructed in the sea or soil, a gina type gasket shown in FIG. 9 is used. The drawing is a sectional view. A soft nose 2 for obtaining a primary water blocking effect is formed at the tip of a main body 1 made of an elastic material such as rubber, and a fixed portion 3 is integrally formed at the rear end. .

The flexible joint thus constructed is attached to the joint end surface of the box body. Generally, the soft nose 2 is formed of an elastic material having a hardness smaller than that of the main body 1, and is attached to the abutting end surface of one box body by the fixing portion 3, and when it abuts the abutting end surface of the other box body, The nose 2 is first deformed so as to function intensively at the time of the primary water stop.

Further, the main body 1 is provided with a sufficient thickness in the shearing direction so that the main body 1 does not fall down due to water pressure or the contacting force of the box members. Further, as a conventional example, as shown in FIG. 10, a laminated portion 4 in which fibers are laminated at regular intervals above and below the main body portion 1 close to the soft nose 2 and the main body portion 1 close to the fixed portion 3 of the Gena type gasket is formed over the entire width. The rubber part is left in the middle. Also in this structure, the same effect as in the above-mentioned conventional example is exerted, and moreover, the stress concentration effect is enhanced as compared with the above-mentioned conventional example.

[0005]

According to such a conventional technique, when stopping water with a soft nose, it is necessary to generate a stress concentration phenomenon. To generate the concentration phenomenon, at least The portion directly below the specific part needs to have higher rigidity than the main body. However,
The difference in apparent rigidity due to the difference in hardness of the elastic body does not reach a significant difference because the same type of displacement form is required when a force is applied, and as a result, the stress is dispersed and the stress concentration phenomenon occurs. There is a problem that you cannot get it.

Further, according to the technique of laminating a fiber layer directly under the soft nose, the central portion is narrowed in order to reduce the initial reaction force, which results in an unstable posture during displacement in the shearing direction. There is a problem that the water-stopping effect is impaired, and wrinkles occur and durability is impaired. further,
As shown in FIG. 8, there is a problem that when the continuous box body is bent at the connecting portion, the main body portion is destroyed without delay.

[0007]

Therefore, in the present invention, the soft nose for enhancing the water blocking effect, the main body functioning at the time of compression, and the fixing portion for attaching to the connecting portion are integrally formed of an elastic material such as rubber. In the flexible joint, the central portion in the cross-sectional width direction of the main body is bonded and laminated with an elastic material by laminating a laminated material made of fiber or metal to form a laminated portion, and both side portions thereof are elastic body portions made of elastic material. The height of the central portion is lower than that of the outer portion of the main body to form a soft nose.

[0008]

According to the above construction, by selecting the hardness of the elastic body of the elastic body portions on both sides, the spring characteristic and the water stopping ability corresponding to the pulling force at the time of press contact can be obtained, and the laminated portion is laminated. When the box body is displaced due to ground subsidence, etc. by obtaining the desired spring characteristics by selecting the rigidity of the material, the number of layers and the spacing, and by making the compression spring characteristics that match the spring characteristics of the tension material required during pressure welding. Since the joint portion moves integrally without being bent, the entire box body connected without excessive moment concentration on the connection portion corresponds.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view, FIG. 2 is an enlarged cross-sectional view showing a mounted state, FIG. 3 is a plan view showing a state of being mounted and joined to an end face of a box body, in the figure, 5 is a main body portion, The central portion, which has left both side portions in the width direction, is a laminated portion 6 in which laminated bodies of fibers or the like are laminated, and elastic portions 7 such as rubber are formed on both side portions thereof.

The laminated portion 6 has a structure in which a laminated body 8 such as natural or synthetic fibers or metal mesh is bonded and embedded in an elastic material, and has a structure to obtain a high spring force in order to cope with the pressure contact force. This spring characteristic is determined by the rigidity of the material used and the number of layers. The elastic body portions 7 on both sides are only elastic bodies in order to correspond to the pulling force at the time of initial joining, and it is possible to change different spring characteristics by changing the hardness of rubber.

Reference numeral 9 denotes a soft nose, the height of the central portion of which is lower than the outer portion of the main body portion, and the Young's modulus of which is lower than that of the main body portion 5. The elastic body parts 7 on both sides
It is advisable to form the soft nose 9 at the tip of the outer portion corresponding to the above. Reference numeral 10 denotes a fixing portion formed on the bottom of the main body portion 5, and as shown in FIG. 2, a locking hole 12 is formed which extends from the main body portion 5 and through which a fixing bolt 13 is inserted. Further, a reinforcing material 11 such as an iron plate is embedded in the fixing portion 10.

The flexible joint is constituted by the above, and as shown in FIG. 3, the fixed portion 10 is attached to the end surface of the box 14 by the bolts 13, and the box 14 is connected so as to face each other.
The soft nose 9 is brought into contact with, and is connected in a tensioned state with a tension material such as a piano wire. Therefore, the spring characteristic required when the main body portion 5 is pressed is a compression spring characteristic which is in harmony with the spring characteristic of the tension member, whereby the coupled box bodies 14 are integrated when the box body 14 is displaced due to ground subsidence or the like. Therefore, the safety of the entire box body 14 connected is increased without an excessive moment being concentrated on the connecting portion. This feature is shown in Figure 4.
Shown in. The broken line on the compression side in FIG. 4 indicates the conventional joint, and the solid line indicates the present invention.

Further, since the laminated portion 6 has a small amount of deflection, no peeling or cracking from the elastic body portion 7 occurs, and a stress relaxation phenomenon peculiar to rubber occurs due to the hard spring property during compression. rare. As shown in FIG. 5, the spring characteristics of the flexible joint described above are related to the pulling force by the jack of the box 14 and the effective stroke, as shown in FIG. Can be modified by Further, the subsequent hard spring characteristic portion corresponds to the pressure contact force after drawing, and the spring characteristic can be modified to a desired spring characteristic by the laminated material and the number of laminated layers.

This flexible joint can also be used when connecting large floating bodies on the sea as shown in FIG. 6, in which case the upper part is opened and the floating body is drawn to drain the water in the floating body. By doing so, as shown in FIG. 7, the floating bodies are kept in contact with each other by the action of water pressure.

[0015]

According to the present invention described in detail above,
In a flexible joint in which a soft nose that enhances the water-stopping effect, a main body functioning at the time of compression, and a fixing portion for attaching to a connection point are integrally made of an elastic material such as rubber, the central portion in the cross-sectional width direction of the main body portion. A laminated material made of fiber or metal is glued and laminated on an elastic material to be embedded to form a laminated portion, both sides of which are elastic body portions, and soft noses are provided at the ends corresponding to the both sides. By forming the elastic body, by selecting the hardness of the elastic body, it is possible to obtain spring characteristics and water stopping capability corresponding to the pulling force at the time of pressure contact, and for the laminated portion, select the rigidity of the laminated material, the number of laminated layers and the interval. This has the effect that desired spring characteristics can be obtained.

Further, the central portion of the main body is a laminated portion, and both side portions are elastic members, so that the tension force at the time of initial joining can be coped with and the spring characteristic of the tension member required at the time of pressure welding at the laminated portion. Since the compression spring characteristics are in harmony, when the box body is displaced due to ground subsidence or the like, conventionally, as shown in FIG. 8, the connected box body moves integrally without bending, and thus the connecting portion. This has the effect of increasing the safety of the entire box body connected without excessive moment concentration.

Further, the laminated portion prevents the sliding phenomenon due to the pseudo sliding of the rubber-like substance, and has an effect that a stable frictional force can be dealt with. Furthermore, since the soft nose is formed only on the side portion corresponding to the elastic body portion of the main body portion, there is an effect that the water blocking effect is stabilized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example.

FIG. 2 is an enlarged cross-sectional view showing a mounted state.

FIG. 3 is a plan view showing a state in which the box body is attached to and joined to an end surface of the box body.

FIG. 4 is a graph showing a spring characteristic of a laminated portion.

FIG. 5 is a graph showing the spring characteristics of the flexible joint of the example.

FIG. 6 is an explanatory view of a state in which floating bodies are joined.

FIG. 7 is an explanatory diagram of a joined state of floating bodies.

FIG. 8 is an explanatory view of a bent state of the joint of the box body.

FIG. 9 is a cross-sectional view showing a conventional example.

FIG. 10 is a cross-sectional view showing another conventional example.

[Explanation of sign]

5 Main body 6 Laminated part 7 Elastic body part 8 laminated materials 9 soft nose 10 Fixed part

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-5-39699 (JP, A) JP-A-54-38633 (JP, A) JP-A-52-15586 (JP, A) JP-A-61- 175387 (JP, A) JP 61-200276 (JP, A) Actual opening 57-164198 (JP, U) Actual opening 59-38557 (JP, U) Actual public 48-22090 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 27/00-27/12 B32B 15/14 E02D 25/00 F16L 17/00

Claims (2)

(57) [Claims] 1. A flexible joint in which a soft nose for enhancing water blocking effect, a main body functioning at the time of compression, and a fixing portion for attaching to a connection point are integrally formed of an elastic material such as rubber, wherein a cross section of the main body is provided. Flexibility characterized in that the central portion in the width direction is made by adhering and laminating a laminated material made of fiber or metal material to an elastic material and embedding it into a laminated portion, and both side portions thereof are elastic body portions made of elastic material. Fittings. 2. The flexible joint according to claim 1, wherein a soft nose is formed at a tip portion corresponding to the vicinity of both side portions.