JPS6117104Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an intermediate pushing device for a propulsion method for forming underground conduits using humid pipes or the like.

The semi-shield method is widely used as a propulsion method for forming underground pipelines.

As shown in Figure 1, in the semi-shield construction method, a semi-shield machine B is placed at the tip of a hume pipe A to excavate, and each hume pipe A is sequentially connected with a steel collar C. It is promoted by E.

In order to accurately construct long distances with such a construction method and to obtain curved construction, it is necessary to install intermediate pushing devices F at appropriate intervals of the humid pipe A.

As shown in Fig. 2, the conventional intermediate press device F has a medium press sleeve 1 fitted over the front and rear hume pipes A ₁ and A ₂ on the inner circumferential surface near one end thereof. A contact plate 2 that contacts the pipe end of A ₁ is fixed, and a large number of jacks 4 are interposed in the circumferential direction between the contact plate ₂ and the contact plate 3 that contacts the pipe end of the fume pipe A 2 on the other hand. The water stop at the fitting portion of both hume tubes A ₁ and A ₂ and the intermediate push sleeve 1 is achieved by fitting a rubber ring 6 into a groove 5 formed on the outer circumferential surface of the end of the hume tube.

_The intermediate pressing sleeve 1 in the intermediate pressing device F as described above must be formed long as shown in FIG. There is a need to.

However, as the intermediate push sleeve 1 becomes longer, when the hump pipes A ₁ and A ₂ are curved, the gap T created between the end of the middle push sleeve 1 and the outer circumferential surface of the hump pipe A ₂ increases, and the rubber Since the effect of ring 6 is completely lost, groundwater mixed with earth and sand flows into the pipe, which not only makes it impossible to carry out the work smoothly.
There is a problem in that cavities occur in the ground around the outside of the pipe, causing ground subsidence.

In addition, even if the expansion and contraction of the jack changes, the amount of engagement between the intermediate push sleeve 1 and the hume tube _A2 must be maintained, so when incorporating the intermediate push device F, it is necessary to use a hume tube exclusively for the intermediate push. There is the inconvenience of not having to do so.

This invention was made in order to solve the problems and drawbacks of conventional intermediate pressing equipment, and provides an intermediate pressing equipment that has an excellent water-stopping effect and can be constructed without using a dedicated humid pipe. The purpose is to

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

As shown in Fig. 3, the intermediate press device of this invention is
It is composed of an outer collar 11, an inner collar 12 that fits into the collar 11, and a water stop means 13 that closes the fitting portion between the inner and outer collars 11 and 12.

The outer collar 11 is provided with a ring-shaped abutment plate 15 on the inner side of the end of the collar body 14, which abuts against the end of the _one -sided hume pipe A1, and is fitted onto the end face of this abutment plate 15 externally to the one-sided hume pipe _A1 . It is formed by fixing a short cylindrical body 16, and the cylindrical body 16 and the hume pipe _A1 are kept watertight by a packing 18 fitted in a groove 17 of the hume pipe _A1 .

The inner collar 12 has a collar main body 19 that fits into the main body 14 of the outer collar 11 with a slight gap, and a collar main body 19 that is fixed inside the outer end of the main body 19 so as to abut against the pipe end of the other fume pipe _A2 . It is formed of a ring-shaped contact plate 20 and a cylindrical body 21 fixed to the outer periphery of the corresponding plate 20 so as to fit onto the other hume pipe _A2 .

As shown in FIG. 4, the water stop means 13 includes a ring-shaped gasket 22 that is brought into pressure contact with the inner circumferential surface of the main body 14 in the outer collar 11 and the inner end surface of the main body 19 in the inner collar 12; A large number of packing pressers 23 are formed to have a U-shaped cross section and are arranged at regular intervals inside the inner collar 12 to hold the packing 22, and each packing press 23 is attached to the inner collar 12 to compress the packing 22. It is formed by a tightening means 24.

The packing holder 23 has a bent piece 25 provided at one end that sandwiches the packing 22 with the end surface of the inner collar 12, and a bent piece 26 at the other end that is a protrusion provided on the inner periphery of the main body 19 of the inner collar 12. Multiply with 27,
The gasket 22 is held so as to move integrally with the inner collar 12.

The tightening means 24 includes a bolt 28 protruding from the inner periphery of the inner collar 12, a nut 30 screwed into the bolt 28 protruding from the through hole 29 of the packing holder 23, and tightening the nut 30 to tighten the packing 22 to the outer collar. 1
It is designed to be pressed toward the inner circumference of 1.

In addition, the contact plates 15 and 2 of the inner and outer collars 11 and 12
Intermediate pusher jacks 31 are interposed between the two at regular intervals in the circumferential direction, so that the expansion and contraction of each jack 31 can be freely controlled.

The intermediate push device of this invention has the above-mentioned configuration, and is installed between the hume pipes at appropriate positions in the propulsion method of forming pipes using hume pipes.
The Hume tube is sequentially propelled when used in conjunction with a main pusher, and by controlling each intermediate pusher jack 31, various propulsions from straight to curved motion can be obtained.

As shown in Fig. 3, the intermediate pushing device used during construction of the above propulsion method connects the front and rear humid pipes _A1 and _A2 through the inner and outer collars 11 and 12 that fit together, and the collars 11 and 12. The fitting part is sealed by the gasket 22 of the water stop means 13, and the contact plates 15 and 20
An intermediate pusher jack 31 is interposed between them.

FIG. 3 shows the middle pusher jack 31 in its most contracted state, and when this jack 31 is extended to apply a thrust to the humid tube A1, the outer collar ₁₁ moves to the left in FIG.

The length of the fit between the inner and outer collars 11 and 12 is maintained at a length commensurate with the expansion and contraction stroke of the jack 31. Therefore, even when the inner and outer collars 11 and 12 perform expansion and contraction operations, the seal 22 keeps the fitted portion watertight. definitely held.

In addition, since the lengths of the inner and outer collars 11 and 12 can be determined according to the expansion and contraction stroke of the inner pusher jack 31, the length from the seal 22 to the end of the outer collar 11 can be made extremely short. Also, there is little gap between the outside of the outer collar 11 and the outer periphery of the inner collar 12,
Infiltration of groundwater into the pipe through this gap can be effectively prevented.

The above-mentioned intermediate pushing device is an intermediate pushing jack 3 after the construction of the pipeline.
1 may be left removed, or the construction may be completed by filling the space formed by the inner and outer collars 11 and 12 with mortar or the like.

As described above, according to this invention, the inner collar is fitted inside the outer collar, and the fitting part of the inner and outer collars is sealed by the sealing means and the tightening means. The joint can be reliably water-tightened with a seal, and since it has a double structure, the overall length, especially the length from the outer collar seal to the outer edge, can be shortened, making it easy to use when constructing curves. Also, the gap between the outer edge of the outer collar and the outer circumferential surface of the inner collar is reduced, preventing underground water from flowing into the pipe, allowing for smooth construction, and increasing the strength of the inner and outer collars. improves.

In addition, the fitting parts to the front and rear fume pipes can be shortened, and the fitting amount of the front and rear fitting parts can be made to be the same, making it possible to carry out intermediate pressing without using special hume pipes for intermediate pressing. Become.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a pushing device, Fig. 2 is a sectional view showing a conventional intermediate pushing device, Fig. 3 is a sectional view of the intermediate pushing device according to this invention, and Fig. 4 shows the main parts of the same. FIG. 11...Outer color, 12...Inner color, 1
3...Water stop means, 14...Outer collar body, 1
5, 20...Plate, 19...Inner collar body, 2
2...Patchkin, 23...Patchkin presser, 24...
...Tightening means.

Claims (1)

[Scope of utility model registration request] An outer collar having a cylindrical body on one end side and a stop plate provided inside, which is fitted onto one of the hume pipes that are to be in contact with each other, and an outer collar that fits inside the outer collar and the other one is fitted onto the outer collar. an inner collar having a cylindrical body at the other end and a contact plate provided inside; a plurality of intermediate push jacks interposed between the contact plate of the outer collar and the contact plate of the inner collar; and the outer collar and the inner collar. A water stop means for closing the fitting portion of the collar, the water stop means comprising: a gasket that presses against the inner end surface of the inner collar and the inner circumferential surface of the outer collar; a gasket retainer that holds the gasket; An intermediate pressing device used in the propulsion method, which is formed by attaching a packing holder to an inner collar and tightening means for compressing the packing.