JP3420850B2 - Intermediate sleeve tube for propulsion method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate sleeve tube for a propulsion method. 2. Description of the Related Art A propulsion method is known as one of the methods for laying a pipeline in the ground. In this method, as shown in FIG. 2, the starting pit 1 is cut from the surface of the ground, and a main pushing jack 2 is arranged therein. If it is propelled underground, the next propulsion pipe 3 is added in the starting pit 1 and propelled similarly, and this operation is repeated in order. Reference numeral 4 denotes a leading conduit. [0003] In this propulsion method, when a large number of propulsion pipes 3 are joined and propelled, the frictional resistance C between the outer circumference of the pipes and the soil is increased.
May exceed the strength of the propulsion pipe 3, which is not preferable.
Therefore, as a countermeasure in that case, an intermediate sleeve method has been conventionally known. In this intermediate sleeve construction method, as shown in FIG. 2, an intermediate sleeve pipe 5 having a telescopic structure provided with an intermediate jack is provided between the propulsion pipes 3 in the propulsion section.
Is arranged, and the pipe 3 is propelled by the combination of the original pushing and the middle pushing. More specifically, as shown in FIG. 2, when the frictional resistance C between the outer periphery of the pipe 3 and the soil is lower than the strength of the pipe 3, the intermediate sleeve pipe 5 is contracted in a state where the intermediate sleeve pipe 5 is contracted. Is not operated, and propulsion is performed only by the propulsive force A of the main push jack 2. When the frictional resistance C between the pipe 3 and the soil approaches the strength of the pipe 3, the main jack 2 is not actuated as shown in FIG. The tube 5 is extended so that only the tube 3 ahead of the intermediate sleeve tube 5 is propelled. Then, when the stroke of the intermediate jack becomes full, as shown in FIG. 4, the pipe 3 on the rear side of the intermediate sleeve pipe 5 is propelled by the propulsive force A of the main pushing jack 2 to recover the stroke of the intermediate jack. FIG. 5 shows a detailed structure of the intermediate sleeve tube 5. As shown, the intermediate sleeve tube 5 is connected to the receiving tube 7.
And an insertion tube 8 movably inserted in the axial direction inside the reception tube 7. An intermediate jack 10 that extends and contracts in the axial direction of the pipe is provided between the distal end 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 causes the receiving pipe 7 and the insertion pipe 8 to relatively move in the axial direction, thereby expanding and contracting the intermediate sleeve pipe 5. The aforementioned propulsive force B is generated. [0006] A tubular sediment inflow prevention plate 12 that covers the outer periphery of the distal end portion of the receiving tube 7 is attached to the inlet tube 8. When the insertion tube 8 and the receiving tube 7 move relatively in the axial direction and the intermediate sleeve tube 5 expands and contracts, the surrounding soil flows between the receiving hole and the receiving hole. This is to prevent the user from doing so. In order to reliably prevent the inflow of earth and sand, an annular seal member 13 is disposed between the inner periphery of the earth and sand 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, screw out the bolt 17 from the press wheel 16 to seal
It is configured such that a predetermined sealing function is obtained by compressing 13. [0007] The receiving pipe 7 on the distal end side of the rear end projection 9
A tapered sealing material pressing surface 18 is formed on the inner circumference of the receiving tube 7. The receiving pipe 7 is located at a position deeper than the sealing material pressing surface 18.
A protrusion 19 is formed on the inner surface of the. When the propulsion work is completed, the receiving pipe 7 and the insertion pipe 8 are joined in the pipe. In this case, the intermediate jack 10 is extended again, and the distal end of the insertion tube 8 is
The receiving pipe 7 and the insertion pipe 8 are relatively moved in the axial direction so as to be positioned corresponding to the sealing material pressing surface 18. Then, the intermediate jack 10 is removed, and as shown in FIG. 6, an annular sealing material 20 is disposed between the sealing material pressing surface 18 and the outer peripheral surface of the insertion tube 8. Apply push ring 22. Then, the middle wheel 23 is engaged with the projection 19, and the sealing material is formed by the reaction force when the middle wheel 23 is pushed through the connecting rod 25 by the bolt 24 screwed out from the pressing wheel 22.
Applying a compressive force to 20, to obtain a predetermined sealing function. FIG. 6 also shows a joint 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 tube 8 is
Utilizing the same joint structure as described above, it is joined to the socket of another propulsion pipe connected to this insertion pipe 8. However, in such a configuration, even when it is not necessary to operate the intermediate jack 10 during the propulsion work, the receiving pipe 7 and the insertion pipe 8 are joined in the pipe. In doing so, it is necessary to relatively move the receiving tube 7 and the insertion tube 8 in the axial direction, and there is a problem that the operation is troublesome. Even if the intermediate jack 10 is extended to move the receiving pipe 7 and the insertion pipe 8 relative to each other in the axial direction after the completion of the propulsion work as described above,
When the socket tube 8 is loosened and removed, the insertion tube 8
There is a problem that it may be difficult to secure a predetermined dimension for installing the sealant in some cases. Accordingly, the present invention solves such a problem, and it is not necessary to relatively move the receiving tube and the insertion tube in the axial direction when the receiving tube and the insertion tube are joined in the tube. In addition to the above, even if the insertion tube enters the receiving tube when the intermediate jack is removed, it is an object of the present invention to appropriately install the sealing material in response to the insertion tube. In order to achieve the above object, the present invention provides a method in which the outer circumference of a distal end of an insertion tube and the inner circumference of a receiving pipe are provided.
A first split ring, an annular sealing material, a second split ring, and a backup ring fitted in an annular groove on the outer circumference of the insertion tube along a direction away from the distal end surface of the insertion tube. Are arranged in this order, and the first split ring, the sealing material, and the second split ring can be pressed toward the backup ring by a pressing ring joined to the distal end surface of the insertion tube, and the seal is formed. One end of a first split ring contacting one end of the material and one end of a second split ring contacting the other end of the sealing material have an outer tapered surface and an inner tapered surface on the other side. Is formed. In such a configuration, when the propulsion work is completed, the relative position between the insertion pipe and the receiving pipe along the pipe axis direction is not changed, that is, the intermediate position is further increased. Remove this intermediate jack without activating the jack. Then, the second split ring, the sealing material, and the first split ring are arranged between the insertion pipe into which the backup ring is fitted and the receiving pipe, and the first split ring is pressed by a pressing ring. The seal is compressed between the ring and the second split ring. When the insertion tube reenters the back side of the reception tube due to the removal of the intermediate jack, the sealing material is compressed at the entry position. In addition, while forming an outer peripheral taper surface at one of the end of the first split ring and the end of the second split ring,
Since the inner peripheral taper surface is formed on the other side, the portion of the sealing material corresponding to the outer peripheral taper surface is strongly pressed against the inner periphery of the receiving tube,
In addition, the portion of the sealing material corresponding to the inner peripheral taper surface will be strongly pressed against the outer periphery of the insertion tube, and as a result, the intermediate sleeve tube will be replaced with a normal inner surface joint type pipe joint to install the intermediate jack. In spite of the fact that the gap between the inner peripheral surface of the receiving tube and the outer peripheral surface of the insertion tube is large, a required surface pressure is generated on the sealing material. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. 1 by assigning the same reference numerals to the same members as those shown in FIGS. I do. As shown in the figure, no special tapered sealing material pressing surface is formed on the inner periphery of the receiving tube 7. Instead, an annular groove 32 is formed on the outer periphery of the insertion tube 8 at a predetermined distance from the distal end surface 31, and a backup ring 33 that fits tight is fitted in the annular groove 32. In addition, between the inner periphery of the receiving tube 7 and the outer periphery of the insertion tube 8 between the distal end surface 31 of the insertion tube 8 and the backup ring 33, along the direction from the distal end surface 31 to the backup ring 33. , A first split ring 34, an annular seal member 35 made of rubber, and a second split ring 36 are arranged in this order. The first split ring 34 and the second split ring 36 are both divided into appropriate numbers along the circumferential direction. At a plurality of circumferential positions on the distal end surface 31 of the insertion tube 8, internal threads 38 are formed in the axial direction of the tube. A press ring 40 is attached by a bolt 39 screwed into the inner screw 38, and the press ring 40 can press the first split ring 34, the sealing material 35, and the second split ring 36 toward the backup ring 33. It is. An inner peripheral tapered surface 41 is formed at a portion of the first split ring 34 which is in contact with one end of the sealing material 35. An outer peripheral tapered surface 42 is formed at a portion of the second split wheel 36 which is in contact with the other end of the sealing material 35. In such a configuration, when the propulsion work is completed, the relative position between the insertion pipe 8 and the reception pipe 7 along the pipe axis direction is not changed, that is, the intermediate jack is further extended. Remove this intermediate jack without operating. Even if the insertion tube 8 reenters the back side of the receiving tube 7 when the intermediate jack is removed, the relative position between the insertion tube 8 and the receiving tube 7 is maintained as it is. Do not change. An annular groove is formed from the distal end face 31 side of the insertion tube 8.
A backup ring 33 is fitted over the outer ring 32, and a second split ring 36 and a sealing material 35 are provided between the outer periphery of the insertion tube 8 and the inner periphery of the receiving tube 7 between the backup ring 33 and the distal end surface 31. And the first split ring 34 are arranged so as to be fitted. Finally, the bolt 39 is screwed into the inner screw 38, and the pressing wheel 40 is mounted. Then, the first split ring 34 and the second split ring are sandwiched between the push ring 40 and the backup ring 33.
The seal material 35 is compressed between the seal material 35 and the seal material 35. At this time, the inner peripheral taper surface 41 is formed on the first split ring 34 and the second split ring 34 is formed.
Since the outer peripheral tapered surface 42 is formed on 36, these tapered surfaces 4
The sealing material 35 is elastically deformed corresponding to
Part 43 of the sealing material corresponding to the inner peripheral tapered surface 41 of the split ring 34
Is strongly pressed against the outer peripheral surface of the insertion tube 8, and the second split ring 36
The portion 44 of the seal material corresponding to the outer peripheral tapered surface 42 is strongly pressed against the inner peripheral surface of the receiving tube 7. As a result, in the intermediate sleeve tube, the gap A between the inner peripheral surface of the receiving tube 7 and the outer peripheral surface of the insertion tube 8 is formed larger than that of a normal inner surface joint type pipe joint for installing the intermediate jack. Nevertheless, a sufficient required surface pressure can be generated on the inner and outer peripheral sides of the seal member 35. It should be noted that, conversely to the above, an outer tapered surface may be formed on the first split ring 34 and an inner tapered surface may be formed on the second split ring 36. As described above, according to the present invention, after the propulsion work is completed, the intermediate jack is further operated to move the insertion pipe and the receiving pipe along the pipe axis direction. Even if the insertion tube re-enters the back side of the receiving tube after the intermediate jack is removed without changing the proper position, the sealing material can be appropriately compressed at the inserted position. In addition, the outer peripheral taper surface is formed at one of the end of the first split ring and the end of the second split ring, and the inner peripheral taper surface is formed at the other end. Part can be pressed strongly against the inner circumference of the receiving pipe, and the part of the sealing material corresponding to the inner circumferential tapered surface can be pressed strongly against the outer circumference of the insertion pipe. As a result, the intermediate sleeve pipe is used to install the intermediate jack. Despite the gap between the inner peripheral surface of the inlet pipe and the outer peripheral surface of the inlet pipe being larger than that of a normal inner surface joint type pipe joint, reliably generate the required surface pressure on the sealing material. Can be.

BRIEF DESCRIPTION OF THE 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 schematic diagram illustrating a conventional propulsion method using an intermediate sleeve method. FIG. 3 is a schematic diagram showing the next stage of FIG. 2; FIG. 4 is a schematic diagram showing the next stage of FIG. 3; FIG. 5 is a sectional view of a conventional intermediate sleeve tube for a propulsion method. FIG. 6 is a cross-sectional view showing a joint completed state after completion of propulsion of the intermediate sleeve tube of FIG. 5; [Description of Signs] 7 Receiving pipe 8 Inserting pipe 33 Backup ring 34 First split ring 35 Seal material 36 Second split ring 40 Press ring 41 Inner peripheral taper surface 42 Outer peripheral taper surface

Continuation of the front page (56) References Japanese Utility Model Sho 60-32490 (JP, U) Japanese Utility Model Sho 57-151492 (JP, U) Japanese Utility Model Sho 58-12958 (JP, Y2) (58) Fields surveyed (Int .Cl. ⁷ , DB name) E21D 9/06 311 F16L 1/024 F16L 21/00-21/02

Claims (1)

(57) [Claims 1] An insertion tube is inserted movably in the axial direction inside the reception tube, and the distal end of the insertion tube and the back end of the reception tube in the tube. An intermediate jack pipe is provided between the inner pipe of the insertion pipe and the inner circumference of the receiving pipe along a direction away from the distal end face of the insertion pipe. And a first split ring, an annular sealing material, a second split ring, and a backup ring fitted in an annular groove on the outer periphery of the insertion tube are arranged in this order, and a tip of the insertion tube is provided. The first split ring, the sealing material, and the second split ring are configured to be able to be pressed toward the backup ring by a pressing ring joined to a surface, and the first split ring that is in contact with one end of the sealing material. An outer peripheral taper surface is formed on one of the end and one end of the second split ring that is in contact with the other end of the sealing material. Intermediate sleeve tube for jacking method characterized by forming the inner peripheral tapered surface towards.