JPS6112467Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a steel pipe, water supply system, sewerage system, public ditch,
This invention relates to a cylindrical flexible expansion joint used to connect underground conduits such as underground passages and tunnels.

Conventionally, when cylindrical bodies such as steel pipes are buried underground, adjacent cylindrical bodies such as steel pipes are connected by flexible expansion joints in order to absorb uneven settlement.

FIG. 1 shows one embodiment of the same, and a flexible expansion joint 1 is composed of a pair of flexible expansion and contraction tubes 2 and 2' and a rigid tube 3 that connects them.
With such a flexible expansion joint 1, the steel pipes 4, 4'
are connected in series as shown in Fig. 1, and the connected steel pipes 4,
By burying the steel pipes 4' underground, uneven settlement of the steel pipes 4 and 4' can be absorbed. In order for the flexible expansion joint 1 to largely absorb the uneven settling of the steel pipes 4 and 4', it is desirable that the flexible expansion tubes 2 and 2' deform equally. However, steel pipe 4,
4', Depending on the state of the earth pressure acting on the flexible expansion joint 1, only one flexible expansion joint 2 may deform as shown in Figure 2, while the flexible expansion joint 2' may not deform. , there was a risk that the flexible telescoping tube 2 would be sheared.
That is, if the amount of unequal settlement is larger than the amount that can be absorbed by only one flexible telescoping tube 2, one of the flexible telescoping tubes 2 will break, which is undesirable.

In order to solve this problem, as shown in FIG. ，
2' may be deformed equally.

However, in this case, the flexible telescoping tubes 2, 2' are restricted by the arms 5, 5' and 6, 6' as shown in the figure, and can only be expanded, contracted and bent, so the absorption amount _α1 of uneven settlement can only be reduced. I can't get it.

The object of the present invention is to provide a cylindrical flexible expansion joint that can eliminate these drawbacks. That is, in the present invention, long holes are provided at both ends of a connecting arm rotatably attached to a rigid pipe, and a pin protruding from a cylindrical body such as a steel pipe is inserted into the long holes. Two or more flexible telescoping tubes connecting adjacent cylindrical bodies during equal subsidence can perform shearing deformation in addition to bending deformation and expansion/contraction deformation, and each flexible telescoping tube can deform almost equally. In this way, a large uneven settlement amount of adjacent cylindrical bodies such as steel pipes can be absorbed.

An embodiment of the cylindrical flexible expansion joint of the present invention will be described below with reference to FIGS. 4 to 6. Fourth
In the figure, cylindrical bodies 7, 7' such as steel pipes are connected by a flexible and extensible joint tube according to the present invention.
The flexible and stretchable joint tube 8 includes a pair of flexible and stretchable tubes 9,
9', a rigid cylinder 10 connecting these parts, and bases 10A and 10'A. As shown in FIG. 5, the flexible telescoping tubes 9 and 9' have a reinforcing ring 12 inside a serpentine tube body 11 made of rubber or synthetic resin.
is buried and covered with a reinforcing cloth 13, a reinforcing steel wire 14 is wrapped around the trough from above, and a covering layer 11a of rubber, synthetic resin, etc. is applied. It is formed to prevent crushing. Rigid cylinder 10, base 10A, 1
On the outer peripheral surface of 0'A, arm supports 1 are respectively installed.
5, 16, and 17 are provided protrudingly. Inside the arm support 15, as shown in FIG. 6, spaces A and B are defined by a partition 18.
A connecting arm 19 is inserted into the space A, and the intermediate portion of the connecting arm 19 is attached to the arm support by a pin 20 facing the center of the rigid cylinder 10.
5 is rotatably supported. This connecting arm 19 is formed from a cylindrical body that is hollow inside and square in cross section, and both ends thereof are connected to the bases 10A and 10'A.
It is formed to straddle the . Note that the arm supports 16 and 17 are also formed in the same manner. Both ends of the connecting arm 19 are inserted into the spaces A and A of the arm supports 16 and 17, and long holes 19a and 19b extending in the longitudinal direction are bored in these ends. Long hole 19
Pins 21 and 22 attached to arm supports 16 and 17 are attached to a and 19b, and elongated holes 10A and 10
A and a connecting arm 19 are connected.

In a flexible expansion joint for a cylindrical body having such a configuration, when the cylindrical bodies 7, 7' are buried underground, the connecting arm 19 is positioned on the side of the flexible expansion joint 8, and the pin 20 , 21, 22 in the horizontal direction.
In this state, if the cylindrical bodies 7 and 7' sink unevenly due to earth pressure due to ground subsidence, etc., as shown in Fig. 7,
The connecting arm 19 is rotated around the pin 20, forcing the rigid cylinder 10 to be located at a position approximately intermediate between the cylindrical bodies 7 and 7', and the pin 2
1 and 22 move within the elongated holes 19a and 19b, and the flexible telescoping tubes 9 and 9' extend equally and bend equally to absorb the uneven subsidence. In addition, supports 15 to 1 of the examples described above
7 may be provided with reinforcing ribs 23, 23 as shown in FIG. 8, or the connecting arm 19 described above may be supported by a pin 24 protruding from the rigid cylinder 10 as shown in FIG. good. Also, the cap 10A, 1
Of course, instead of connecting both ends of the connecting arm 19 to 0'A, it may be connected to the cylindrical bodies 7, 7' (see FIG. 11). Furthermore, the cylindrical bodies 7, 7' and the caps 10A, 10'A may be connected together by welding, or may be connected by providing a flange on both and fastening this flange with bolts or nuts, or by other means. Any method of connection is acceptable as long as the two are integrally connected, such as by connecting the two.

Furthermore, in the embodiment described above, an example was shown in which two flexible telescopic tubes were connected by one rigid tube, but the first
As shown in Figure 0, the cylindrical bodies 7, 7' may be connected by a flexible expansion joint 8' in which three telescoping cylinders 9, 9', 9'' are connected by two rigid cylinders 10. To explain the function of the joint tube 8 having the above-mentioned configuration, if uneven settlement occurs with respect to the cylindrical bodies 7, 7' buried underground and the joint tube 8, for example, the cylindrical body 7 on one side When the ground on the ' side sinks, the connecting arm 19 is pivotally attached to the joint tube 8, so the connecting arm 19 allows the joint tube 8 to
The arm 19 is inclined toward the lower right side in the figure, and the arm 19 holds the joint tube 8 linearly and forcibly. Since it works in this way, the flexible telescoping cylinder 9 on the cylindrical body 7 side among the flexible telescoping cylinders 9, 9', 9''
has a fan shape that opens upward, and the flexible telescopic tube 9'' on the cylindrical body 7' side has a symmetrical fan shape that opens downward.
will be deformed in a substantially S-shaped manner with vertically symmetrical sector shapes on the left and right sides, respectively. As each flexible telescoping tube 9 deforms into a symmetrical fan shape or a substantially S-shape in this way, uneven ground subsidence will not be applied to each flexible telescoping tube 9 one by one. By making the entire joint tube 8 gentle, it is possible to absorb the uneven subsidence of the ground, and it is possible to prevent the joint tube from being subjected to force that would force it to bend locally. In this embodiment, the expansion, contraction, and bending of each flexible tube 9, 9', and 9'' is limited in one direction, but the purpose of the present invention is to prevent the flexible tubes from unequal subsidence of the ground. This purpose can be fully achieved.Although not shown, a flexible expansion joint may be constructed by connecting three or more telescopic tubes and rigid tubes in series.

Furthermore, the above-described configuration can be applied to cylindrical bodies 7, 7' such as underdrains, as shown in FIG. and a load-bearing member 26.

As explained above, the present invention provides long holes at both ends of the connecting arm rotatably attached to the rigid cylinder.
By inserting a pin protruding from the side of a cylindrical body made of steel pipe or the like into the elongated hole, two or more flexible extensible tubes connecting adjacent cylindrical bodies can be flexibly deformed and expanded/contracted during uneven settlement. In addition to deformation, shear deformation occurs, and each flexible telescoping tube is deformed almost equally, so the unequal settlement of the cylindrical body made of adjacent steel pipes, etc. can be made equal and large for each flexible telescoping tube. This has the effect of being able to be absorbed.

[Brief explanation of the drawing]

1 to 3 are side views showing a conventional example of a flexible expansion joint, FIG. 4 is a side view showing a first embodiment of the flexible expansion joint of the present invention, and FIG. 6 is a sectional view of the connecting arm of the present invention, FIG. 7 is a side view showing the operating state of the first embodiment of the present invention, and FIGS. 8 to 9 are: 10 to 11 are cross-sectional views showing other embodiments of the present invention.
FIG. 3 is a side view showing another embodiment of the present invention. 7, 7'... Cylindrical body, 8, 8'... Flexible expansion joint (joint tube), 9, 9', 9'', 9... Flexible expansion tube,
10... Rigid cylinder, 10A, 10'A... Base, 1
9, 19'...Connection arm, 19a, 19b...
Long hole, 20, 21, 22...pin.

Claims (1)

[Scope of utility model registration request] A flexible extensible joint tube includes at least two or more flexible extensible tubes, a rigid tube that connects the flexible extensible tubes, and the flexible tube located at both ends of the joint tube provided as necessary. and a base that is integrally coupled to the telescopic tube, and also connects adjacent cylindrical bodies together by the joint tube, and straddles between the adjacent cylindrical bodies or between the bases, and a flexible telescopic tube. A flexible connecting arm is rotatably attached to the side surface of the rigid cylinder, long holes extending in the longitudinal direction are formed at both ends of the arm, and each of the above-mentioned 1. A flexible expansion joint for a cylindrical body, characterized in that a pin is attached to a side surface of the cylindrical body, and the pin is inserted into the corresponding elongated hole.