JPS6219748Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flexible expansion joint of a cylindrical body, which is used for connecting culverts of polygonal or rectangular cross sections, sewers, public ditches, underground passages, tunnels, and the like.

Attach an anchoring member having a casing to each of the pair of culverts to be connected to the joint of the culvert, and insert both ends of the load-bearing member provided between the two anchoring members into the casing of the anchoring member. In addition to being inserted in a manner that cannot be removed, cylindrical flexible water-stopping members are arranged on the inner and outer peripheral sides of the load-bearing member,
There is a type that connects both culverts so that they can be moved relative to each other and in a watertight manner.

Although this type of underdrain joint can tolerate relative displacement between a pair of underdrains as described above, the relative displacement tolerance has not always been sufficiently large.

In view of this point, the present invention provides a flexible expansion joint for cylindrical bodies that can sufficiently tolerate the amount of relative displacement between a pair of cylindrical bodies to be connected.

In the present invention, a flexible and stretchable joint tube having a square cross section is composed of at least two flexible tubes and a rigid tube that connects the flexible tubes, and the flexible tubes have adjacent square cross sections. The ends of the cylindrical bodies are integrally connected by the joint tube, and at least two or more connecting arms directly or indirectly spanning the adjacent cylindrical bodies are arranged parallel to each other and spaced apart vertically. disposed on the side surface of the joint tube, the intermediate portion of each of the connecting arms is rotatably pivoted to the side surface of the rigid tube, and elongated holes extending in the longitudinal direction are formed in both ends of the connecting arms, respectively. However, the structure is characterized in that the pins inserted into each of the elongated holes are attached directly to the side surface of each of the cylindrical bodies or indirectly by being attached to the end of the joint tube.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a cylindrical body connected by the flexible expansion joint of the present invention, and the cylindrical concrete culverts 1 and 1' have a rectangular cross-sectional shape. This adjacent concrete culvert 1,
1' are connected to each other by a flexible expansion joint 2 according to the present invention.

Figure 2 is an enlarged view of the flexible expansion joint 2 shown in Figure 1, where 3 and 3' are fixed to opposite ends of the concrete culverts 1 and 1' shown in Figure 1. This is the anchoring member. In addition, the flexible expansion joint 2 is
Like the concrete culverts 1 and 1', it has a flexible and extensible joint tube 4 whose cross section is formed into a substantially rectangular shape.

The joint tube 4 is a short rigid tube 5 with a substantially rectangular cross section.
, a flexible telescopic cylinder 6 in which the rigid cylinder 5 and the anchoring member 3 are connected together, and a flexible telescoping cylinder 6' in which the rigid cylinder 5 and the anchoring member 3' are connected in series.

Since the flexible telescoping tubes 6 and 6' have the same structure, the structure of the flexible telescoping tube 6 will be explained below, and the description of the flexible telescoping tube 6' will be explained using the same reference numerals with a dash added to corresponding parts. Omitted by adding .

The flexible telescoping tube 6 is composed of force-bearing members 7, 8, a serpentine-shaped flexible water-stopping member 9 made of rubber, synthetic resin, etc. (see FIG. 3). In Figure 3, 1
Reference numerals 0 and 11 designate casing sections provided at opposite ends of the anchoring member 3 and the rigid cylinder 5, and the casing section 10 has spaces 10a,
10b is formed, and the housing portion 11 has spaces 11a,
11b is formed. Both ends of the force-bearing member 7 described above are inserted into the spaces 10a and 11a in a manner that cannot be removed, and both ends of the force-bearing member 8 are inserted into the spaces 10a and 11a.
b, 11b so that they cannot be removed.
Moreover, the flexible water-stopping member 9 is disposed between the load-bearing members 7 and 8, and both ends thereof are connected to the housing parts 10 and 11.
is fixed in a watertight manner. With this structure, the anchoring member 3 and the rigid tube 5 can be slightly displaced relative to each other in the directions toward and away from each other and in the direction across the concrete culverts 1 and 1'.

Arm support members 12 and 13 are fixed to the side surface of the anchoring member 3 at intervals vertically. The arm support members 12 and 13 have spaces A and B defined by a partition wall 14, as shown in FIG.
Arm support members 12', 13' and 12'', 13'' of similar structure are also fixed to the anchoring member 3' and the rigid cylinder 5, respectively.

On the side surface of the joint tube 4, connection arms 15 and 16 are arranged in parallel with each other and spaced apart from each other in the vertical direction and have a length spanning between the anchoring members 3 and 3'. This connecting arm 15
is inserted into each space A of the arm support members 12, 12', 12'', and its intermediate portion is rotatably supported by the arm support member 12'' by a pin 17. Long holes 15a and 15b extending in the longitudinal direction are bored at both ends of the connecting arm 15, and the pin 1 inserted into the long holes 15a and 15b is inserted into the long holes 15a and 15b.
8 and 19 are attached to arm support members 12 and 12'. The connecting arm 16 is similarly supported by arm support members 13, 13', 13'', and in the figure, 16a and 16b are long holes bored at both ends of the connecting arm 16, and 20 is a hole in the connecting arm 16. Pins 21 and 22, which rotatably support the intermediate portion on the arm support member 13'', are pins inserted into the elongated holes 16a and 16b and attached to the arm support members 13 and 13''.

Next, the operation of the flexible expansion joint of the cylindrical body having such a configuration will be explained.

When one of concrete culverts 1 and 1' is lowered due to earth pressure due to uneven subsidence of the ground, etc.,
The connecting arms 15 and 16 are rotated around the pins 17 and 20, and the rigid cylinder 5 is forcibly displaced downward, and the flexible telescoping cylinders 6 and 6' are expanded and contracted to remove obstacles such as the ground. It absorbs subsidence and prevents damage to the joints of the concrete underdrains 1 and 1'. Further, both flexible telescoping tubes 6, 6' are equally displaced, and the displacement is not biased to one side.

In the embodiment described above, reinforcing ribs 23 may be provided on the arm support members 12 to 12'' and 13 to 13'' as shown in FIG. In addition, pin 1 mentioned above
7, 18, 19 and 20, 21, 22 may be directly fixed to the side surfaces of the anchoring members 3, 3' and the rigid cylinder 5 as shown in FIG.

Furthermore, a structure may be adopted in which a flexible telescoping tube 6' and a rigid tube 5 are further added to the structure described above as shown in FIG. Although an example using two connecting arms 15 and 16 has been shown, two or more connecting arms may be provided.

In addition, in the embodiment described above, an example was shown in which the flexible expansion joint according to the present invention is applied to a concrete culvert, but the invention is not necessarily limited to this, and the flexible expansion joint according to the present invention can be applied to a concrete culvert. It may be used to connect underdrains made of materials such as steel pipes, various metals, etc.

Furthermore, the flexible expansion joint of the present invention does not have to be limited to a cylindrical shape with a rectangular cross section; any polygonal or square shape can be selected depending on the cylindrical body to be joined.

Furthermore, the flexible expansion joint of the present invention can be used for ducts other than underdrains as long as the cylindrical body has a rectangular cross section. Further, the flexible telescoping tube does not need to have the above-described structure, and may have a bellows-like and expandable cylindrical structure made of rubber, synthetic resin, metal, etc., for example.

Further, although the cylindrical body, the anchoring member, and the rigid cylinder are shown as being integrally formed, they may be formed into a cylindrical shape by assembling a plurality of segments.

Note that the material of the rigid tube may be any rigid material such as steel, concrete, or other metal.

In addition, although the connecting arm has both ends attached to both ends of the anchoring member, that is, the joint tube,
It may be directly attached to each cylindrical body beyond each anchoring member.

As explained above, the present invention comprises a flexible and extensible joint tube having a square cross section, consisting of at least two flexible extensible tubes and a rigid tube in which the flexible extensible tubes are connected to each other. Since the structure is such that adjacent cylindrical bodies with rectangular cross-sections are connected by the joint tube, even the amount of uneven settlement, which could not be absorbed in the past, can be well absorbed and damage to the joint part can be prevented. can. Furthermore, by changing the number of flexible telescoping tubes, the amount of absorption can be changed according to the amount of unequal subsidence that can be predicted in advance, so the amount of material can be minimized.

Further, an intermediate portion of a connecting arm that directly or indirectly straddles adjacent cylindrical bodies is rotatably pivoted to the side surface of the rigid cylinder, and long holes extending in the longitudinal direction are formed in both ends of the connecting arm. The pins drilled and inserted into each long hole are attached to the cylindrical body directly or indirectly by being attached to the joint tube, so that there is no difference in level between adjacent cylindrical bodies due to uneven settlement. Even if this occurs and the axis is shifted, it is possible to reliably prevent a situation in which only one of the plurality of flexible telescoping tubes is expanded and contracted and the rest are not expanded and deformed.

Furthermore, since two or more of the above-mentioned connecting arms are arranged in parallel, it is possible to prevent the cylindrical bodies from rotating in a twisting direction due to earth pressure or the like. Furthermore, since there are a plurality of connecting arms, part of the stretching force, bending force, etc. that acts on the flexible expansion joint during uneven settlement can be distributed to each connecting arm.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a concrete culvert connected using a flexible expansion joint according to the present invention (portions related to connecting arms are omitted). FIG. 2 is a side view of a flexible expansion joint showing an embodiment of the present invention. FIG. 3 is a partial sectional view of the flexible telescoping tube shown in FIG. 2. FIG. 4 is a sectional view showing an example of the relationship between the arm support and the connecting arm shown in FIG. 2. 5 and 6 are cross-sectional views showing other structures of the arm support shown in FIG. 2. FIG. 7 is a side view of a flexible expansion joint showing another embodiment of the present invention. 1, 1'... Concrete culvert (cylindrical body), 2...
...Flexible expansion joint, 3,3'... Anchoring member, 4...
Joint tube, 5... Rigid tube, 6, 6'... Flexible telescopic tube, 15, 16... Connection arm, 15a, 15
b, 16a, 16b...long hole, 17-22...pin.

Claims (1)

[Scope of utility model registration request] A flexible and stretchable joint tube with a square cross section is composed of at least two flexible tubes and a rigid tube in which the flexible tubes are connected to each other, and adjacent cylindrical bodies with a square cross section are connected to each other. the ends of which are integrally connected by the joint tube, and at least two or more connecting arms are arranged between the adjacent cylindrical bodies in parallel with each other and spaced apart from each other on the side surface of the joint tube, Each of the connecting arms is rotatably attached to a side surface of the rigid cylinder, long holes extending in the longitudinal direction are formed at both ends of each of the connecting arms, and pins inserted into the long holes are inserted into the long holes. A flexible expansion joint for a cylindrical body with a square cross section, characterized in that it is attached directly to the side surface of each cylindrical body or indirectly by being attached to an anchoring member attached to an end of each cylindrical body.