JP3322858B2 - Flexible rubber 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 rubber joint, and more particularly to a flexible rubber joint suitable as a joint for an open-cut tunnel.

[0002]

2. Description of the Related Art Conventionally, when an underground structure such as a common ditch, a subway or an underground road is constructed by an open-cutting method, a joint portion of a box that defines an underground space has, for example, a substantially L-shaped cross section. 5 (a) and 5 (b)
Are arranged as shown in FIG.
A flexible rubber joint 60 in which a waterproof rubber member 63 having a substantially Ω-shaped cross section is disposed in a mounting groove 62 defined by the above. Here, the metal frame 61 is used to eliminate the influence of unevenness of the concrete surface on which the waterproof rubber member 63 is mounted, and to secure the flatness of the mounting surface.

The flexible rubber joint 60 is provided for the purpose of avoiding water leakage in the underground structure when the ground 70 supporting the underground structure sinks due to an earthquake or the like. Usually, it is installed at a place where displacement of the ground 70 can occur, or at each connection portion of the box 76 that partitions the underground space 77. Generally, the flexible rubber joint 60 is installed by leveling concrete (abandoned concrete) 72 on the surface of an open channel 71 obtained by excavating the ground 70 and then adjusting the horizontal and vertical positions with leveling bolts 73. While installing the flexible rubber joint 60 at a predetermined position in the open channel 71,
Is fixed to a steel sheet pile 75 by a supporter 74.

[0004] Thus, the flexible rubber joint 60 is placed in the open channel 71.
Is installed, a mold is assembled along the metal frame 61, and concrete is cast to form boxes 76 on both sides of the flexible rubber joint 60 that define the underground space. As described above, the metal frame 61 of the flexible rubber joint 60 serves as a reference for performing a formwork for forming the box 76, and eliminates unevenness of the concrete surface constituting the box 76, In addition to serving as a member for securing the flatness of the mounting portion of the waterproof rubber member 63, it also serves as a dam when pouring concrete into the formwork.

Further, the metal frame 61 has a role of partitioning a mounting groove 62 for mounting the water-stopping rubber member 63 due to its L-shaped cross section.
By mounting the waterproof rubber member 63 in the mounting groove 62, the projecting portion of the waterproof rubber member 63 does not occur in the underground space 77, and the underground space 77 can be used effectively. FIG. 5A shows the flexible rubber joint 60 in a simplified manner, in which the waterproof rubber member 63 is omitted and only the metal frame 61 is shown. Also,
FIG. 5B is a view taken in the direction of arrows AA in FIG.
(b) Reference numeral 65 in the figure indicates a holding plate, reference numeral 78 indicates a joint material, reference numeral 79 indicates a water-swelling rubber, and reference numeral 80 indicates a wall of a box 76.

[0006]

However, the metal frame 61 having a substantially L-shaped cross section is formed by bending a flat plate according to its shape, or a commercially available angle steel is used. Therefore, in the former case, there is a problem that the manufacturing cost is increased due to bending, and in the latter case, the shape of the metal frame 61 is restricted by the angle iron standard, There has been a problem that it is difficult to perform a free design according to the size required for the flexible rubber joint.

Further, when the concrete for forming the box 76 is poured, as shown in FIG. 5 (b), mainly in the vicinity of the substantially L-shaped metal frame 61, the concrete shrinks due to the drying shrinkage of the concrete. There is also a problem that the air pool 81 is likely to be generated due to the air pool 81 and water leaks easily from the air pool 81. In order to prevent this water leakage, although measures are usually taken to dispose the water-swelling rubber 79 on the frame 61,
When the air reservoir 81 becomes large, it cannot be dealt with only by the water expansion rubber 79.

Accordingly, an object of the present invention is to provide a flexible rubber joint capable of reducing the cost by simplifying the structure of a metal frame for attaching a water-stopping rubber member and ensuring the water-stopping. To provide.

[0009]

Means for Solving the Problems and Effects of the Invention A flexible rubber joint according to the present invention for solving the above-mentioned problems is a flexible rubber joint arranged at a connecting portion of a box defining an underground space. The flexible rubber joint includes a pair of metal frames, and a waterproof rubber member provided between the pair of metal frames. The pair of metal frames includes a pair of metal frames. A flat plate,
It is arranged so as to be inclined with respect to the wall of the box, and to define a mounting groove having a substantially V-shaped cross section, the opening width of which increases toward the inner surface side of the box. The water rubber member has a substantially inverted U-shaped water-stopping rubber main body, and a substantially V-shaped outward from the bases on both sides at the open end of the water-stopping rubber main body and toward the top side of the water-stopping rubber main body. A pair of extending flange portions, and a cross-sectional shape obtained by integrating the pair of flange portions, and further fixing the surfaces of the pair of flange portions on the opening end side to a pair of metal flat plates in the mounting groove. It is characterized by being.

According to the flexible rubber joint of the present invention, a set of metal flat plates constituting the metal frame is arranged inclined with respect to the wall of the box, whereby the waterproof rubber member is formed. A mounting groove, which is a space for mounting, is defined. Therefore, unlike the related art, it is not necessary to prepare a substantially L-shaped metal frame by specifically bending a metal plate or using an angle steel selected from a predetermined standard. Since the metal frame can be formed using the metal flat plate, the material cost and the processing cost of the metal frame can be reduced, and the working efficiency at the time of the flexible rubber joint construction is greatly improved. be able to.

Further, since the mounting position of the water-stopping rubber member is in the form of a groove recessed into the box, the projecting of the water-stopping rubber member does not impair the effective use of the underground space. Furthermore, according to the flexible rubber joint of the present invention, when the concrete is cast in order to form the box, the metal frame serving as the damping plate is in a flat plate shape. It is possible to form a box that does not have a concave corner-shaped concrete-filled portion due to the corners of the L-shaped metal frame, and that is uniform and does not generate air pockets or the like. .

In addition, according to the flexible rubber joint of the present invention,
A pair of flange portions of the water-stop rubber member protrude to the top side of the water-stop rubber main body as compared with a conventional, substantially Ω-shaped water-stop rubber member attached to a substantially L-shaped metal frame. However, since it does not hinder the deformability of the water-stopping rubber main body, the same water-stopping function as the conventional water-stopping rubber member can be maintained. In the flexible rubber joint according to the present invention, the angle between the pair of metal flat plates in the mounting groove defined by the pair of metal frames and the surface of the pair of flanges of the water-stopping rubber member on the opening end side. The angle made is 40-1
Preferably it is 40 °.

In this case, a space in the mounting groove defined by the pair of metal frames can be ensured to a sufficient extent to accommodate the waterproof rubber member, and the flange portion of the waterproof rubber member can be secured. A work space for attaching the water-stopping rubber member to the metal frame can be provided on the top surface of the above without impairing the deformability of the water-stopping rubber main body. Furthermore, it is preferable that the flexible rubber joint of the present invention has a pressing plate disposed on the top surface of the flange portion of the waterproof rubber member.

As described above, when the waterproof rubber member is attached to the metal frame by using the pressing plate, when the flexible rubber joint or the box undergoes shear deformation or the like, the waterproof rubber member is connected to the metal frame. Cracks, breakage, and the like can be prevented from occurring at the bolt portion fixed to the body.

[0015]

Next, a flexible rubber joint according to the present invention will be described in detail. The flexible rubber joint 10 of the present invention is installed in the open channel 71 in the same manner as the above-described metal frame having a substantially L-shaped cross section, that is, as shown in FIG. FIG. 2 is an enlarged view of a portion indicated by a circle B in FIG. 1 of the flexible rubber joint 10 of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is a cross-sectional view showing only the waterproof rubber member 13.

FIG. 1 shows the flexible rubber joint 10 in a simplified manner, in which the waterproof rubber member 13 is omitted and only the metal frame 11 is shown. In FIG. 1, reference numerals 70, 72,
73, 74 and 75 are all the same as in FIG. 2, the boxes 76 provided on both sides of the flexible rubber joint 10 are omitted. The flexible rubber joint 10 of the present invention includes:
As shown in FIG. 1 and FIG. 2, the pair of metal frames 11 are disposed at a connecting portion (not shown) of a box 76 that partitions the underground space 77, and the pair of metal frames 11. And a water-stopping rubber member 13 (omitted in FIG. 1) provided between the two.

The metal frame 1 in the flexible rubber joint 10
As shown in FIG. 3, as shown in FIG. 3, a set of metal flat plates is inclined with respect to the wall 80 of the
Are arranged so as to define a mounting groove 12 having a substantially V-shaped cross section, the opening width of which increases as going to. In addition,
In FIG. 3, reference numeral 78 denotes a joint material. As described above, the metal frame 11 serves as a part of a dam when casting concrete in the formation of the box 76.
Since 1 is a flat plate, unlike the related art, there is no reentrant corner which is difficult to be filled with concrete.
Therefore, it is possible to form the box 76 uniformly and without generating air pockets or the like.

The waterproof rubber member 13 of the flexible rubber joint 10 is outwardly formed from a substantially inverted U-shaped waterproof rubber body 14 and bases 16 on both sides of the open end 15 of the waterproof rubber body 14. Further, it has a cross-sectional shape in which a pair of flange portions 18 extending in a substantially V shape toward the top portion 17 of the water-stopping rubber main body 14 are integrated. As shown in FIGS. 3 and 4, the water-stopping rubber member 13 is configured such that the surface 21 on the opening end 15 side of the pair of flange portions 18 is formed into a pair of metal flat plates (metal frame body 11) in the mounting groove 12. Are fixed by bringing them into contact with each other.

The waterproof rubber member 13 has weather resistance, aging resistance,
Since it is preferable to have excellent properties such as ozone resistance and elasticity, for example, chloroprene rubber (CR), butadiene rubber (BR), ethylene-propylene-diene rubber (EPDM), natural rubber (NR) And the like. From the viewpoint of improving the pressure resistance performance, a reinforcing base cloth 19 can be placed inside the water-stopping rubber member 13. In this case, even if a crack occurs in the water-stopping rubber member 13, the propagation of the crack can be prevented, and a significant decrease in water-stopping performance can be prevented.

In particular, the flange portion 18 of the waterproof rubber member 13
Is preferably provided with a plurality of reinforcing base cloths 19. In this case, it is possible to exert a sufficient resistance against bearing damage that can be caused by the bolt 20 for fixing the water-stopping rubber member 13 to the metal frame 11. The orientation of the reinforcing base cloth 19 is not particularly limited, but is preferably a radial structure rather than a cross structure. In this case, wrinkles and the like are less likely to occur when shear deformation is applied, and the advantage of excellent durability is obtained.

The mounting surface of the flange portion 18 of the waterproof rubber member 13 to the metal frame 11 (that is, the flange portion 1)
On the surface 8 on the side of the opening end 15 in FIG. More preferably, the ridge 22 is formed integrally with the flange portion. At the time of attachment to the metal frame 11, since the ridges 22 are compressed, the waterproofness between the attachment surface 21 of the flange portion 18 and the metal frame 11 is further improved.

When attaching the waterproof rubber member 13 to the metal frame 11, the top portion 17 of the flange 18, which is a surface opposite to the attachment surface (the surface of the flange 18 on the side of the opening end 15) 21. It is preferable to provide a holding plate 24 on the side surface 23. As the holding plate 24, for example, a metal flat plate or the like can be used. By providing such a holding plate 24, even if the flexible rubber joint 10 or the box 76 undergoes shearing deformation or the like, cracks occur at the bolts 20 for fixing the waterproof rubber member 13 to the metal frame 11, It is possible to prevent breakage and the like from occurring.

In the flexible rubber joint 10 according to the present invention, when the box 76 installed in the open channel 71 is buried in the ground to make the underground space 77 an open channel instead of an open channel, FIG. As shown, it is necessary to provide the metal frame 11 and the waterproof rubber member also on the upper side to form a ring. The corner portion 110 of the metal frame 11 shown by the reference numeral B in FIG. 1 is preferably not a pair of metal plates orthogonal to each other but, for example, an inclined surface as shown in FIG. With such a shape, it is possible to prevent an excessive load from being applied to the waterproof rubber member 13 provided at the corner 110. In FIG. 2, the water-stopping rubber member 13 is divided and partially shown. However, at the time of actual construction, it is necessary to continuously install the water-stopping rubber member 13 also at the corner.

It is possible to install the continuous water-stopping rubber member 13 in a bent state at the corner 110. However, after attaching separate members, the connecting portion of each member is connected at the construction site. It is preferable that they are vulcanized and adhered and integrated. The angle θ (see FIG. 3) formed by a set of metal flat plates in the mounting groove 12 in the metal frame 11 and the waterproof rubber member 13
The angle θ ′ (see FIG. 4) between the mounting surfaces (surfaces on the opening end 15 side) 21 of the pair of flange portions 18 is 40
The angle is preferably from 140 to 140 °, more preferably from 90 to 120 °.

If the angle θ exceeds the above range, there is a possibility that a sufficient space in the mounting groove 12 defined by the pair of metal frames 11 cannot be secured. Therefore, the effective use of the underground space 77 may be impaired due to the protrusion of the waterproof rubber member 13. On the other hand, when the angles θ and θ ′ fall below the above range, the waterproof rubber member 13 is
The work space for attaching to the
There is a possibility that it may be difficult to secure the deformability without hindering the deformability.

It is preferable that the angle θ formed by the pair of flat metal plates and the angle θ ′ formed by the mounting surface 21 are the same. In this case, there is obtained an advantage that the adhesion between the water-stopping rubber member 13 and the metal frame is enhanced, and the water-stopping property is further increased. The flexible rubber joint of the present invention is not limited to the above embodiment, and various design changes are possible as long as the objects, functions and effects of the present invention are not impaired.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a state where a flexible rubber joint according to the present invention is installed in an open channel.

FIG. 2 is a perspective view showing one embodiment of a flexible rubber joint according to the present invention.

FIG. 3 is an enlarged sectional view taken on line AA of FIG. 2;

FIG. 4 is a sectional view showing a waterproof rubber member in the flexible rubber joint of the present invention.

FIG. 5A is a schematic view showing a state in which a conventional flexible rubber joint using a metal frame having a substantially L-shaped cross section is installed in an open channel, and FIG. It is sectional drawing of a rubber joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flexible rubber joint 11 Metal frame 12 Mounting groove 13 Waterproof rubber member 14 Waterproof rubber main body 15 Open end 16 Base 17 Top 18 Flange 21 Opening end side surface (mounting surface) 76 Case 77 Underground space 80 Wall

Claims (3)

(57) [Claims] 1. A flexible rubber joint disposed at a connecting portion of a box defining an underground space, wherein the flexible rubber joint is provided between a pair of metal frames and a pair of metal frames. A pair of metal frames, a pair of metal flat plates is inclined with respect to the wall of the box, and as it goes to the inner surface side of the box. It is arranged so as to define a mounting groove having a substantially V-shaped cross section having a wide opening width, wherein the water-stopping rubber member includes a substantially inverted U-shaped water-stopping rubber main body, and the water-stopping rubber main body. A pair of flanges extending in a substantially V-shape from the bases on both sides at the open end outward and toward the top of the water-stopping rubber main body, respectively, and has a cross-sectional shape integrally formed, The surfaces on the opening end side of the pair of flange portions are each formed into a pair of metal flat plates in the mounting groove. Flexible rubber joints, characterized in that in which a constant. 2. An angle between a pair of metal flat plates in the mounting groove and an angle between surfaces of the pair of flanges on the opening end side is 40 to 140 °. Flexible rubber joint. 3. The flexible rubber joint according to claim 2, wherein a holding plate is disposed on a surface of the flange portion on a top portion side.