JP3406068B2 - 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. 4, the starting pit 1 is cut from the ground surface, a main jack 2 is disposed inside the starting pit 1, and the propulsion pipe 3 is propelled into the ground by the main pushing jack 2, and one pipe 3 is moved. 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 method, as shown in FIG. 4, 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. 4, 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 while 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. As shown in FIG. 5, when the frictional resistance C between the pipe 3 and the soil approaches the strength of the pipe 3, the main pushing jack 2 is not operated, and the propulsion B of the intermediate jack of the intermediate sleeve pipe 5 causes the intermediate sleeve to move. 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. 6, the pipe 3 on the rear side of the intermediate sleeve pipe 5 is propelled by the propulsive force A of the original pushing jack 2 to recover the stroke of the intermediate jack. FIG. 7 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. 8, 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. The middle wheel 23 is engaged with the projection 19, and the sealing material is formed by a reaction force when the middle wheel 23 is pushed through the connecting ring 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. 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 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, after the propulsion work is completed as described above, the connection between the receiving pipe 7 and the insertion pipe 8 of the intermediate sleeve pipe 5 is required. There is a problem that the intermediate jack 10 needs to be operated, which leads to poor work efficiency. SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to make it possible to join a receiving tube and an insertion tube of an intermediate sleeve tube without operating an intermediate jack. In order to achieve this object, the present invention provides an annular groove formed on the outer periphery of an insertion tube, a backup ring fitted in the annular groove, and a backup ring. An annular sealing material disposed on the outer circumference of the insertion tube on the distal end side, a bolt screwed into the insertion tube, and the sealing material is engaged with the bolt and the sealing material is fastened to the backup ring by fastening the bolt. It has a pressing member which compresses the sealing material to press the outer peripheral surface of the insertion tube and the inner peripheral surface of the receiving tube. In this configuration, when the propulsion work is completed, the intermediate jack is immediately removed without further moving the receiving pipe and the insertion pipe relative to each other in the axial direction.
Then, a sealing material is arranged on the outer periphery of the insertion tube, and the sealing material is sandwiched between the backup ring and the pressing member,
The sealing material is compressed by fastening the bolt, and the sealing material is pressed against the outer peripheral surface of the insertion tube and the inner peripheral surface of the receiving tube. By doing so, the gap between the inlet pipe and the inlet pipe is sealed without changing the positional relationship between the inlet pipe and the inlet pipe at the end of the propulsion work, and the two pipes are sealed. Joining is performed. An embodiment of the present invention will now be described with reference to FIGS. 1 to 3. The same members as those shown in FIGS. 4 to 8 described above are denoted by the same reference numerals. A detailed description is given below. As shown in the figure, the inner periphery of the receiving tube 7 is not provided with a conventional tapered sealing material pressing surface.
Instead, at the position where the inner peripheral surface 31 in the tube axis direction is radially spaced from the outer peripheral surface of the insertion tube 8, the rear end projection 9 is formed.
From a certain distance. At the tip of the insertion tube 8, a thick portion 32 which becomes thicker toward the inner peripheral side is formed, and at the outer periphery of the distal end edge of the insertion tube 8 corresponding to this thick portion 32, Tapered tapered surface
33 are formed. In addition, this tapered surface
An annular groove 35 is formed on the outer circumference of the insertion tube 8 at a fixed distance beyond 33. A circumferentially-divided backup ring 36 having a rectangular cross-section is fitted into the annular groove 34. When the intermediate sleeve tube 5 is shipped from the manufacturing factory, the backup ring 36 is inserted into the inlet tube 8 inside the receiving tube 7.
Immediately after insertion, the tube is fitted into the annular groove 34 from inside the tube. The distal end surface 34 of the insertion tube 8 is formed with a plurality of inner threads 37 in the tube axis direction in the circumferential direction. At the time of propulsion work, as shown in FIG. 3, a ring-shaped protective attachment 39 formed into an L-shaped cross section and divided into an appropriate number in the circumferential direction in consideration of weight is put on the tapered surface 33. With the tip face 34
The protective attachment 39 is fixed by a bolt 40 screwed into the bracket. The head 41 of the bolt 40 fits into a concave portion 42 formed in the protection attachment 39, so that the head 41 of the bolt 40 is attached to the protection attachment 39.
The jack contact surface 43 that prevents the protrusion of the jack is formed. Therefore, by arranging an intermediate jack (not shown) between the jack contact surface 43 and the rear end projection 9 of the receiving pipe 7, the pipe is propelled by the propulsion method using the intermediate sleeve method. At this time, the tapered surface of the insertion tube 8
33 is covered with a protective attachment 39,
Even if a large force is applied to the insertion tube 8 during propulsion, the tapered surface 33 is prevented from being damaged. The inner peripheral surface 31 of the receiving pipe 7 is used for propulsion.
Even when the insertion tube 8 and the insertion tube 8 are relatively moved in the axial direction, the length is formed so as to always face the tapered surface 33 of the insertion tube 8 and not to cause a collision with the backup ring 36. . When the propulsion is completed, the receiving pipe 7 and the insertion pipe 8
The intermediate jack 10 is removed and the protective attachment 39 is removed without changing the positional relationship with the intermediate jack 10. Next, as shown in FIG. 2, an annular sealing material 45 is provided on the outer periphery of the insertion tube 8 at the distal end side of the backup ring 36, that is, on the outer periphery of the insertion tube 8 including the tapered surface 33.
To fit. Then, a circumferentially-divided circumferential ring 46 is applied to the end face of the sealing material 45, and the circumferentially divided pressing ring is further divided into an appropriate number in the circumferential direction in consideration of the weight.
47, and bolts 48 to be passed through
And tighten it. Then, the pressing ring 47 related to the head of the bolt 48 pushes the sealing material 45 via the abutment ring 46, and compresses the sealing material 45 with the backup ring 36. As a result, the sealing member 45 is pressed against the outer peripheral surface of the insertion tube 8 including the tapered surface 33 in which the occurrence of damage is prevented by the protective attachment 39 and the inner peripheral surface 31 of the receiving tube 7, thereby. A predetermined sealing performance is provided between the receiving pipe 7 and the insertion pipe 8. Thereafter, a known hydraulic test is performed on the seal member 45. As a result of the water pressure test, if there is no abnormality, as shown in FIG. 1, a circumferential split ring 49 is arranged at a position spaced from the pressing wheel 47 toward the rear end projection 9 in the pipe axis direction. Inner peripheral surface 31 of receiving tube 7 between ring 49 and pressing wheel 47
Filler 50 such as mortar is filled inward, and the head of bolt 48 is embedded therein. Further, the space between the pressing wheel 47 and the distal end surface 34 of the insertion tube 8 is also filled with the filler 50, and the thread portion of the bolt 48 existing in that portion is also embedded in the filler 50. . This prevents a decrease in sealing performance due to the loosening of the bolt 48. Further, the exposed portion of the bolt 48 does not exist in the pipe, and when water is passed through the pipe after the pipe laying is completed, the bolt 48 is prevented from coming into contact with the water in the pipe and rust is prevented from being generated. The inner surface of the filler 50 is formed flush with the inner surface of the thick portion 32 of the insertion tube 8 so that the water flow resistance is not increased. In addition, as shown by phantom lines in FIG.
Is stored near the back end projection 9 on the back side of the receiving tube 7 at the time of factory shipment. As described above, according to the present invention, the sealing member arranged on the outer periphery of the insertion tube is sandwiched between the backup ring and the pressing member, and the bolt is screwed into the insertion tube. By fastening, the sealing material is compressed between the backup ring and the pressing member, and this sealing material is pressed against the outer peripheral surface of the insertion tube and the inner peripheral surface of the receiving tube. The sealing material can be compressed only by the member of the above, without changing the positional relationship between the receiving pipe and the insertion pipe at the end of the propulsion work, the gap between the receiving pipe and the insertion pipe as is And these tubes can be joined efficiently and easily.

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 an enlarged view of a main part in FIG. FIG. 3 is a diagram showing a state in which a protective attachment is attached to a distal end of the insertion tube of FIG. 2 during propulsion. FIG. 4 is a schematic diagram illustrating a conventional propulsion method using an intermediate sleeve method. FIG. 5 is a schematic diagram showing the next stage of FIG. 4; FIG. 6 is a schematic diagram showing the next stage of FIG. 5; FIG. 7 is a cross-sectional view of a conventional intermediate sleeve tube for a propulsion method. FIG. 8 is a cross-sectional view showing a joint completed state after completion of propulsion of the intermediate sleeve tube of FIG. 7; [Description of Signs] 7 Reception pipe 8 Insertion pipe 31 Inner peripheral surface 35 Annular groove 36 Backup ring 45 Seal material 47 Press ring 48 Bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 60-32490 (JP, U) Japanese Utility Model Showa 19-19770 (JP, Y1) Japanese Utility Model Showa 58-12958 (JP, Y2) (58) Field (Int.Cl. ⁷ , DB name) E21D 9/06 311 F16L 1/024 F16L 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 sleeve pipe for a propulsion method, wherein an intermediate jack is provided between the annular pipe and an annular groove formed on the outer periphery of the insertion tube, a backup ring fitted in the annular groove, and a tip end of the backup ring. An annular sealing material arranged on the outer periphery of the insertion tube on the side,
The sealing material is compressed between the bolt screwed into the insertion tube and the backup ring by fastening the bolt, and the sealing material is compressed with the outer peripheral surface of the insertion tube and the receiving tube. And a pressing member for pressing against the inner peripheral surface of the intermediate sleeve tube for a propulsion method.