JPH0860982A - Intermediate sleeve pipe for jacking method - Google Patents

Abstract

PURPOSE: To enable an intermediate sleeve pipe for use in jacking method to have a sealing material installed properly to deal with even such a situation that an insertion pipe fits into a socket pipe during removal of an intermediate jack. CONSTITUTION: An annular sealing material 20 is placed between the outer periphery of the end of an insertion pipe 8 and the inner periphery of a socket pipe 7. A bolt 24 driven out of a pushing ring 22 which can compress the sealing material 20 is locked into an intermediate ring 23. Inner peripheral grooves 31 are formed in a plurality of positions in the socket pipe 7 along the direction of a pipe axis. The intermediate ring 23 is fitted into that inner peripheral groove 31 which is located in a position corresponding to the extent to which the insertion pipe 8 fits into the depth of the socket pipe 7.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an intermediate sleeve tube for a propulsion method.

[0002]

2. Description of the Related Art A propulsion method is known as one of the methods for laying a pipeline underground. As shown in FIG. 4, the starting pit 1 is excavated from the surface of the ground, and the original push jack 2 is arranged in the opening. The original push jack 2 propels the propulsion pipe 3 into the ground, and one pipe 3 If it is propelled into the ground, the next propulsion pipe 3 is added in the start pit 1 and propelled in the same manner, and this work is repeated in order. Reference numeral 4 is a front conduit.

In this propulsion method, when a large number of propulsion pipes 3 are joined and propelled, the frictional resistance C between the outer periphery of the pipes and the soil C
May exceed the strength of the propulsion pipe 3, which is not preferable.
Therefore, as a countermeasure in that case, the intermediate sleeve method has been conventionally known. In this intermediate sleeve construction method, as shown in FIG. 4, an intermediate sleeve pipe 5 having an expandable structure having an intermediate jack between the propulsion pipes 3 in the propulsion section.
Are arranged, and the tube 3 is propelled by using both the original push and the middle push.

More specifically, as shown in FIG. 4, when the frictional resistance C between the outer circumference of the pipe 3 and the soil is less than the strength of the pipe 3, the intermediate sleeve pipe 5 is contracted and the intermediate sleeve pipe 5 is compressed. Does not operate and is propelled only by the propulsive force A of the original push jack 2. As shown in FIG. 5, when the frictional resistance force C between the pipe 3 and the soil approaches the strength of the pipe 3, the source push jack 2 is not operated and the thrust force B of the intermediate jack of the intermediate sleeve pipe 5 causes the intermediate sleeve to move. The tube 5 is extended and only the tube 3 on the front side of the intermediate sleeve tube 5 is propelled. When the stroke of the intermediate jack is full, as shown in FIG. 6, the tube 3 on the rear side of the intermediate sleeve tube 5 is propelled by the propulsive force A of the original pushing jack 2 to restore the stroke of the intermediate jack.

FIG. 7 shows a detailed structure of the intermediate sleeve tube 5. As shown, this intermediate sleeve tube 5 is fitted with a socket tube 7
And an insertion tube 8 inserted inside the receiving tube 7 so as to be movable in the axial direction. An intermediate jack 10 extending and contracting in the axial direction of the pipe is provided between the tip of the insertion pipe 8 and the rear end projection 9 of the receiving pipe 7. A plurality of the intermediate jacks 10 are provided in the circumferential direction of the pipe, and the expansion and contraction of the intermediate jacks 10 relatively move the receiving pipe 7 and the insertion pipe 8 in the axial direction to expand and contract the intermediate sleeve pipe 5. The aforementioned propulsive force B is generated.

A cylindrical earth and sand inflow prevention plate 12 that covers the outer periphery of the tip end portion of the receiving pipe 7 is attached to the insertion pipe 8. The earth and sand inflow prevention plate 12 allows surrounding earth and sand to flow between the receiving and inserting openings when the insertion tube 8 and the receiving tube 7 relatively move in the axial direction and the intermediate sleeve tube 5 expands and contracts. This is to prevent it. In order to reliably prevent the inflow of sediment, an annular seal material 13 is arranged between the inner periphery of the sediment inflow prevention plate 12 and the outer periphery of the receiving pipe 7. This sealing material 13
Backup rings 14 and 15 are provided on both sides of the. Then, the bolt 17 is screwed out from the push ring 16 and the sealing material is
By compressing 13, a predetermined sealing function is obtained.

Receiving pipe 7 on the tip side of rear end projection 9
A tapered sealing material pressure contact surface 18 is formed on the inner periphery of the inlet pipe 7 at a position farther from the sealing material pressure contact surface 18.
A protrusion 19 is formed on the inner surface of the.

After the completion of the propulsion work, the receiving pipe 7 and the insertion pipe 8 are joined inside the pipe. In that case, the intermediate jack 10 is extended again so that the distal end portion of the insertion pipe 8 is the reception pipe 7.
The inlet pipe 7 and the inlet pipe 8 are moved relative to each other in the axial direction so as to be positioned corresponding to the seal member pressure contact surface 18. Then, the intermediate jack 10 is removed, and as shown in FIG. 8, an annular seal material 20 is arranged between the seal material pressure contact surface 18 and the outer peripheral surface of the insertion tube 8, and a split ring 21 is interposed in the seal material 20. Apply the push ring 22. Then, the middle ring 23 is engaged with the protrusion 19, and the sealing material is pushed by the reaction force when the middle ring 23 is pushed through the connecting rod 25 by the bolt 24 screwed out from the push ring 22.
A compressive force is applied to 20 to obtain a predetermined sealing function.

Incidentally, FIG. 8 also shows a joint portion 28 between the receiving pipe 7 and the insertion port 27 of the propulsion pipe 3 joined to the receiving pipe 7. The insertion port 29 at the end of the insertion port 8 is the joint part 28.
The joint structure similar to that is used to join to the receiving end of another propulsion pipe connected to the insertion pipe 8.

[0010]

However, in such a structure, after the propulsion work is completed as described above, the intermediate jack 10 is extended so that the socket pipe 7 and the socket pipe 8 are axially opposed to each other. Even if it is moved, when the intermediate jack 10 is loosened and then removed, the insertion pipe 8 may come into the back side of the receiving pipe 7 again, and a predetermined dimension for installing the sealing material should be provided. There is a problem in that it may be difficult to secure it.

Therefore, the present invention solves such a problem so that even if the insertion pipe enters the receiving pipe at the time of removing the intermediate jack, the sealing material can be appropriately installed by coping with it. The purpose is to

[0012]

In order to achieve this object, the present invention is directed to an annular seal member arranged between the outer circumference of the distal end of the insertion tube and the inner circumference of the receiving tube, and the compression of the seal material. A possible push ring, a bolt screwed out from this push ring, a middle ring provided inside the receiving pipe so as to engage with the bolt,
A means for receiving a reaction force at the time of compression of the sealing material via the push ring by screwing out the bolt by engaging with the middle ring at any of a plurality of positions in the pipe axis direction inside the receiving pipe. It was done like this.

[0013]

In such a structure, when the propulsion work is completed, the intermediate jack is re-extended and these pipes are axially arranged so that the insertion pipe and the reception pipe are arranged to be suitable for the installation of the sealing material. Remove this intermediate jack after making relative movement in the axial direction. At this time, if the mouthpiece tube enters the inner side of the mouthpiece tube again, correspondingly, by engaging the middle wheel with the means for receiving the reaction force at the optimum position in the tube axis direction inside the mouthpiece tube, By unscrewing the bolts engaging with the middle wheel, the seal material is appropriately compressed via the push ring.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Based on this, the same members as those shown in FIGS. 4 to 8 described above are designated by the same reference numerals and will be described in detail.

As shown in the drawing, a plurality of annular inner circumferential grooves 31 are formed in the pipe axial direction on the inner surface of the receiving pipe 7 on the inner side of the sealing material pressure contact surface 18. The inner ring 23 is configured to be divided into a plurality along the circumferential direction, and each divided piece 32 is fitted in the inner circumferential groove 31 and is connected to each other by the inner circumferential side connection plate 33 and the fixing bolt 34. It is configured to be connected in the circumferential direction, so that the inner race 23 is assembled in the inner circumferential groove 31. Finally, the split piece 32A fitted in the inner circumferential groove 31 has both end surfaces 35 formed in the same direction as the fitting direction X so that the fitting can be carried out without any problem.

In such a structure, the intermediate jack is removed after the completion of the propulsion work.
When it enters the inner side of the socket pipe 7 again, the split pieces 32, 32A of the middle ring 23 are fitted into the inner circumferential groove 31 at the position corresponding to the entering amount, and these split pieces 32, 32A are connected to the connection plate 33. By assembling each other with the fixing bolt 34,
The inner ring 23 is assembled into an annular shape within the inner circumferential groove 31.

Then, similarly to the one shown in FIG. 8, an annular sealing material is provided between the sealing material pressure contact surface 18 and the outer peripheral surface of the insertion tube 8.
20 are arranged, similarly, split ring 21 and push ring 22 are arranged, and push ring 22
A compression force is applied to the sealing material by a reaction force when the intermediate ring 23 is pushed through the connecting rod 25 by a bolt 24 that is screwed out from the sealing member, and a predetermined sealing function is obtained. At this time, since the middle ring 23 can be arranged in the inner circumferential groove at a position corresponding to the amount of insertion of the insertion tube 8,
Other split ring 21, push ring 22, bolt 24, connecting rod 25, and the like can be properly arranged, and the socket 7 and the socket 8 can be reliably joined.

FIG. 3 shows another embodiment of the present invention. Here, inner screws 37 are formed at a plurality of positions in the circumferential direction on the inner surface of the receiving pipe 7, and studs 38 are screwed into each of the inner screws 37, and the middle ring 23 engages with the studs 38 in the circumferential direction. Is configured. Then, a plurality of inner screws 37 in such a circumferential direction are respectively formed at a plurality of positions in the pipe axis direction, and bolts 38 are respectively attached to the plurality of inner screws 37 in the circumferential direction at arbitrary positions in the pipe axis direction. By screwing in, the intermediate wheel 23 can be arranged at a position corresponding to it. In the case of FIG. 3 as well, it is appropriate that the middle wheel 23 has a divided structure similar to that shown in FIG.

[0019]

As described above, according to the present invention, by engaging with the middle ring at any of a plurality of positions in the pipe axial direction inside the receiving pipe, the sealing through the push ring by screwing out the bolt. Since there is a means to receive the reaction force when the material is compressed, place the middle wheel at the optimum position according to the degree of insertion of the insertion pipe into the back side of the reception pipe after removing the intermediate jack. Therefore, it is possible to always properly seal the space between the receiving tube and the insertion tube regardless of the degree of the insertion of the insertion tube.

[Brief description of drawings]

FIG. 1 is a sectional view of an intermediate sleeve tube for a propulsion method according to an embodiment of the present invention.

FIG. 2 is a side view of the middle wheel in FIG.

FIG. 3 is a sectional view of an intermediate sleeve tube for a propulsion method according to another embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a conventional propulsion method to which an intermediate sleeve method is applied.

FIG. 5 is a schematic diagram showing the next step of FIG. 4.

FIG. 6 is a schematic diagram showing the next step of FIG.

FIG. 7 is a cross-sectional view of an intermediate sleeve tube for a conventional propulsion method.

FIG. 8 is a cross-sectional view showing a completed joining state after the end of propulsion of the intermediate sleeve pipe of FIG. 7;

[Explanation of symbols]

 7 Receiving pipe 8 Inlet pipe 20 Sealing material 22 Push ring 23 Middle ring 24 Bolt 31 Inner groove 37 Inner screw 38 Implant bolt

Claims (1)

[Claims] 1. An insertion tube is movably inserted in an axial direction inside a receiving tube, and an intermediate jack is provided between the tip of the insertion tube and the inner end of the receiving tube inside the receiving tube. An intermediate sleeve pipe for a propulsion method, which is an annular seal member arranged between the outer periphery of the distal end of the insertion pipe and the inner periphery of the receiving pipe, a push ring capable of compressing the seal member, and the push ring. Which is screwed out of the socket, a middle wheel provided inside the socket so as to engage with the bolt, and the middle wheel at any of a plurality of positions in the tube axial direction inside the socket. Therefore, the intermediate sleeve pipe for the propulsion method is characterized by having a means for receiving a reaction force when the seal material is compressed through the push ring by screwing out the bolt.