JP3406076B2 - 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. 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. 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, the intermediate jack 10 is extended after completion of the propulsion work as described above, so that the receiving pipe 7 and the insertion pipe 8 are axially aligned. However, even when the intermediate jack 10 is loosened and removed afterwards, the insertion tube 8 may enter the back side of the receiving tube 7 again. However, there is a problem that it may be difficult to secure the dimensions. Therefore, the present invention solves such a problem, and enables a sealing material to be appropriately installed even if the insertion tube enters the reception tube when the intermediate jack is removed. The purpose is to: In order to achieve this object, the present invention provides an annular sealing member disposed between the outer periphery of the distal end of the insertion tube and the inner periphery of the receiving tube, A pressing ring capable of compressing the material, a bolt screwed out of the pressing ring, and a middle ring provided inside the receiving pipe so as to be engaged with the bolt,
Means for receiving a reaction force at the time of compression of the sealing material via the pressing 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 is like that. In such a configuration, when the propulsion work is completed, the intermediate jack is extended again so that the insertion pipe and the reception pipe are arranged so as to be suitable for the installation of the sealing material. After the tube is relatively moved in the axial direction, the intermediate jack is removed. At this time, if the insertion tube enters the depth side of the receiving tube again, in response to this, by engaging the middle ring with the means for receiving the reaction force at the optimum position in the pipe axis direction inside the receiving tube, By the threading of the bolts related to the middle wheel, the sealing material is appropriately compressed via the pressing wheel. An embodiment of the present invention will now be described with reference to FIGS.
Based on the above, the same members as those shown in FIGS. 4 to 8 described above are denoted 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 inner surface of the receiving pipe 7 on the inner side of the sealing material pressing face 18 in the pipe axis direction. The middle wheel 23 is configured to be divided into a plurality of pieces along the circumferential direction, and each of the divided pieces 32 is fitted in the inner circumferential groove 31 by the connection plate 33 and the fixing bolt 34 on the inner circumference side. It is configured to be connected in the circumferential direction, whereby the middle wheel 23 is assembled in the inner circumferential groove 31. Finally, the divided piece 32A to be fitted into the inner peripheral groove 31 has both end faces 35 formed in the same direction as the fitting direction X so that the fitting can be performed without any problem. In such a configuration, the intermediate jack is removed after completion of the propulsion work.
Is inserted again into the inner side of the receiving pipe 7, the split pieces 32 and 32 A of the middle ring 23 are fitted into the inner peripheral groove 31 at a position corresponding to the amount of insertion, and these split pieces 32 and 32 A are connected to the connection plate 33. By assembling each other with the fixing bolt 34,
The middle wheel 23 is assembled in an annular shape in the inner peripheral groove 31. An annular sealing material is provided between the sealing material pressing surface 18 and the outer peripheral surface of the insertion tube 8 in the same manner as shown in FIG.
20 and the split ring 21 and the pressing ring 22
The compression force is applied to the sealing material by a reaction force when the middle ring 23 is pushed via the connecting rod 25 by the bolt 24 screwed out of the sealing member 25 to obtain a predetermined sealing function. At this time, since the middle ring 23 can be arranged in the inner circumferential groove at a position corresponding to the amount of entry of the insertion tube 8,
Other split wheels 21, press wheels 22, bolts 24, connecting rods 25, and the like can also be properly arranged, and the receiving pipe 7 and the insertion pipe 8 can be securely 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 tube 7, and the studs 38 are screwed into the respective inner screws 37, and the middle ring 23 engages with the plurality of studs 38 in the circumferential direction. It is configured as follows. A plurality of inner screws 37 are formed in such a circumferential direction at a plurality of positions in the tube axis direction, and a plurality of bolts 38 are respectively attached to the plurality of inner screws 37 in the circumferential direction at an arbitrary position in the tube axis direction. , The middle wheel 23 can be arranged at a position corresponding to the screw. Also in the case of FIG. 3, it is appropriate that the middle wheel 23 has the same divided structure as that shown in FIG. As described above, according to the present invention, by engaging with the middle wheel at any of a plurality of positions in the pipe axis direction inside the receiving pipe, the pressing ring by screwing out the bolt can be formed. The intermediate ring has a means to receive the reaction force at the time of compression of the sealing material through the middle jack, so the middle ring is positioned at the optimum position according to the degree of entry of the insertion tube into the back side of the receiving tube after removing the intermediate jack. It is possible to always properly seal the space between the receiving tube and the insertion tube regardless of the degree of entry of the insertion tube.

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 side view of a 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 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 Receiving pipe 8 Inserting pipe 20 Sealing material 22 Pressing ring 23 Middle ring 24 Bolt 31 Inner circumferential groove 37 Inner screw 38 Stud bolt

Continuation of the front page (56) References JP-A 55-73692 (JP, U) JP-A 51-19770 (JP, Y1) JP 1-44623 (JP, Y2) (58) Fields surveyed (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 in which an intermediate jack is provided between the sealing pipe and an annular sealing material disposed between the outer periphery of the distal end of the insertion tube and the inner periphery of the receiving tube. A pressable ring, a bolt screwed out from the press ring, a middle ring provided inside the receiving pipe so as to be engaged with the bolt, and a plurality of positions in the pipe axis direction inside the receiving pipe. An intermediate sleeve pipe for a propulsion method, comprising: a means for receiving a reaction force at the time of compression of the sealing material via a pressing ring by screwing out the bolt by engaging with the middle ring by any one of the methods.