JPH0117752Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is used in the propulsion construction method, which is used for constructing underground sewer pipes, water pipes, etc., by pushing the unit pipes forming the pipes in the middle. This invention relates to a joint for unit pipes for propulsion construction that provides a watertight seal between adjacent unit pipes before and after the unit pipes are propagated by a jack or a self-propelled propulsion device.

(Prior art) The propulsion method constructs a starting shaft and a reaching shaft,
A shield machine and a propulsion unit pipe are set in this starting shaft, and excavation and earth removal work is performed while pressing the propulsion blade opening with the shield jack of the shield machine, and the unit pipe is launched into the formed shaft. This is a construction method in which the main push device is used to push the shaft forward one by one, and if the main push device alone does not provide sufficient propulsive force, an intermediate push jack device is used to propel the shaft through the reaching shaft.

In such a propulsion method, it is necessary to provide a watertight seal between the front and rear unit pipes to prevent underground water from entering the row of unit pipes in the mine.

Conventionally, as shown in FIG. 4, a rubber ring packing 3 is interposed between the joint collar 1 protruding from one unit pipe and the other unit pipe 2, and the joint collar 1
The space between the unit pipe 2 and the unit pipe 2 was sealed watertight.

(Problem to be solved by the invention) However, with the seal using the rubber ring packing 3, when the shaft is curved and each unit pipe is propelled to follow it, the mutual spacing between the joint collar 1 and the unit pipe 2 As shown in FIG.
However, it has the disadvantage that, for example, it separates from the surface of the unit pipe 2 and the watertightness is broken. Also, rubber ring packing 3
In this case, since the rubber ring seal 3 always slides back and forth on the outer periphery of the unit tube 2 when the unit tube is propelled, the rubber ring seal 3 is worn out and the watertightness is easily broken.

An object of the present invention is to provide a joint for unit pipes for propulsion construction that does not break watertight during bending propulsion and can prevent wear of the watertight sealing means.

(Means for Solving the Problems) The joint for unit pipes for the propulsion method according to the present invention is watertightly supported by the ends of one of the front and rear unit pipes and fitted onto the outer periphery of the end of the other unit pipe. with a fitting collar,
a spacer supported on the distal end side of the joint collar to maintain the distance between the collar and the other unit pipe within a permissible range; It is characterized by comprising a bellows type seal which is watertightly fixed to the inner periphery of the joint collar and whose other end is watertightly fixed to the outer periphery of the other unit pipe.

(Function) When a bellows type seal is used in this way, even if the distance between the joint collar and the unit pipe fitted therein changes during bending propulsion, the bellows type seal can follow the change in the distance. This prevents the seal from breaking due to changes in the spacing. Further, since the spacer wheel is interposed between the joint collar and the unit pipe, a gap for operating the bellows type seal can be secured, and the bellows type seal can be operated without being damaged.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the joints of the unit pipes for the propulsion method of this embodiment are watertightly supported by bolts or the like at the ends of one of the front and rear unit pipes 4, and are connected to the other unit pipe 2. Joint collar 1 fitted to the outer circumference of the end of
has. Note that the joint collar may be manufactured integrally with the unit pipe. The end of the unit pipe 2 is reduced in diameter to a small diameter end 2A, and a plurality of guide grooves 5 are formed along the longitudinal direction at intervals in the circumferential direction on the base side of the small diameter end 2A. ing. Fitting color 1
A membrane-shaped bellows seal 6 is disposed between the small diameter end 2A of the unit pipe 2 and the small diameter end 2A, and is fitted onto the outer periphery of the small diameter end 2A. One end of this bellows type seal 6 is watertightly attached and fixed to the inner periphery of the joint collar 1 by a watertight mounting part 7, and the other end is attached to the small diameter end of the unit pipe 2 in a direction such that a U-shaped folded part 6A is formed in the middle. 2A
It is watertightly attached and fixed to a part of the outer periphery near the tip by a watertight attachment part 8. The bellows type seal 6 is formed, for example, from a rubber plate woven with a reinforcing material. Each watertight mounting part 7, 8 has a bellows type seal 6
It is formed by fitting a presser ring 9 on the inner or outer circumference of the ring and tightening it with a bolt. Each guide groove 5
A cylindrical bracket 10 is protruded from the joint collar 1 in correspondence with the spacer 10, and a spacer consisting of a rotatable wheel 11 is supported by the bracket 10 via a bearing 11a, and is fitted into the corresponding guide groove 5. ing. In addition to the wheels of the spacer, a protrusion may also be used.

In such a joint, for example, a bellows-type seal 6 is installed in advance on the inner surface of the joint collar 1 of the preceding unit pipe 4 via the watertight mounting part 7, and then the following unit pipe 2 is inserted into the starting shaft. As shown in FIG. 2, the other end of the bellows type seal 6 is attached to the small diameter portion 2A at the tip using the watertight attachment portion 8, and then the wheel 11 is attached to the joint collar 1 via the bracket 10 and the bearing 12. Form.

In this state, when the following unit tube 2 is pushed by the push device, the subsequent unit tube 2 is advanced so as to reduce the unit tube interval L, and the bellows-type seal 6 is pushed against the U-shaped folded portion 6A. Follow while moving the position. At this time, since the wheels 11 ensure the operating interval of the bellows type seal 6, the bellows type seal 6 can operate smoothly. When the front and rear unit pipes 4 and 2 are propelled through a curved mine, even if the distance between the joint collar 1 and the unit pipe 2 changes between the inside and outside of the bend, the bellows type seal 6 deforms and can follow this. , and the wheels 11 ensure the necessary spacing between the joint collar 1 and the unit pipe 2.

This joint operates in the same way when the front and rear unit pipes are propelled one by one by a self-propelled propulsion device or in multiple units by an intermediate push jack device, and prevents groundwater from entering the pipes.

In particular, the wheel 11 is connected to the unit pipe 2 as shown in FIG.
When it is fitted into the guide groove 5 and rotated, relative rotation of the front and rear unit tubes 4 and 2 in the circumferential direction can also be stopped.

(Effects of the invention) As explained above, in the unit pipe joint for the propulsion method according to the present invention, a bellows type seal is used, one end of which is attached watertight to the inner surface of the joint collar protruding from one unit pipe, and other Since the end is watertightly attached to the outer periphery of the other unit pipe, even if the distance between the joint collar and the unit pipe fitted therein changes during bending, the bellows type seal can follow the change in the distance. This prevents the seal from breaking due to changes in the spacing. Also,
By using this bellows type seal, it is possible to avoid abrasion contact with other parts as much as possible during propulsion, and it is possible to suppress wear.

Furthermore, in the present invention, since a spacer is interposed between the joint collar and the unit pipe, it is possible to secure the interval for operating the bellows type seal and prevent damage to the bellows type seal.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal cross-sectional views of main parts of an embodiment of the joint according to the present invention in different operating states, and FIG. 3 is an explanatory diagram showing the rotation prevention effect of the unit pipe by the spacer in the joint of the present embodiment. , 4 and 5 are longitudinal sectional views of main parts of a conventional joint in different operating states. 1... Fitting collar, 2, 4... Unit pipe, 2A...
... Small diameter end, 5 ... Guide groove, 6 ... Bellows type seal, 6A ... U-shaped folded part, 7, 8 ... Watertight mounting part, 10 ... Bracket, 11 ... Wheel.

Claims (1)

[Scope of utility model registration request] A joint collar that is watertightly supported at the end of one unit pipe in front and back and fitted to the outer periphery of the end of the other unit pipe; and a spacer that is fitted onto the outer periphery of the end of the other unit pipe, one end of which is watertightly fixed to the inner periphery of the joint collar, and the other end of which is fitted onto the outer periphery of the end of the other unit pipe. A unit pipe joint for propulsion construction method, characterized by being composed of a bellows type seal that is watertightly fixed to the outer periphery.