JP4601559B2 - Saya tube propulsion method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a sheath pipe propulsion method for laying a pipe for transporting fluid used for gas, water supply and sewerage, etc. without opening, and a new pipe used therefor.

  As a method of burying pipes for fluid transportation such as ductile cast iron pipes, the excavation method of excavating and laying the ground was common, but recently the traffic volume has increased not only on main roads but also on general roads. Therefore, it is difficult to block traffic due to the open-cut method. For this reason, only the starting and reaching shafts are excavated, and after the fume pipes and steel pipes are propelled and buried as sheath pipes, the sheath pipe propulsion method in which PI-type and PII-type ductile cast iron pipes are inserted and sheathed old pipes are sheathed. As a pipe, a propulsion method such as a pipe-in-pipe method (PIP method) in which a new pipe having a small diameter is inserted therein to renew a pipe line has been widely adopted (hereinafter referred to as a sheath pipe propulsion method and PIP) Both of these laws are called “sheath tube propulsion methods”).

  As shown in FIG. 14, the sheath pipe propulsion method described above is constructed by inserting a new pipe 11 having a smaller diameter into the sheath pipe 12 embedded between the starting shaft 31 and the reaching shaft 32. Is. A hydraulic jack 33 is installed in the start shaft 31, a rear portion of the hydraulic jack 33 abuts against a reaction force receiver 34, and a front portion presses the new pipe 11 via a push angle 35. The new tube 11 is sequentially connected by inserting the insertion port 13 at the tip end thereof into the receiving port 14 at the rear end portion of the preceding new tube 11, and is pushed into the sheath tube 12. A leading sled 36 for reducing the insertion resistance is attached to the tip of the leading new pipe 11.

  When the new pipe 11 is connected and traveled in the sheath pipe 12, the outer peripheral surface of the new pipe 11 slides on the inner peripheral surface of the sheath pipe 12 and travels (runs) as shown in FIG. (See FIG. 15B). In this case, when the insertion length of the new pipe 11 (the length between the starting vertical shaft 31 and the reaching vertical shaft 32) is increased, the force required to insert the new pipe 11 is increased, or the new pipe 11 is bent due to bending of the pipe joint. In some cases, the allowable transmission force of the new pipe 11 may be exceeded due to factors such as a decrease in the allowable transmission force. If the allowable transmission force is exceeded, the new pipe 11 will be damaged, and it will not be possible to insert further.

For this reason, as shown in FIG. 16, there is known a technique in which a travel guide device having casters 41 is provided on the outer peripheral surface of the new pipe 11 and the caster 41 is traveled on the inner peripheral surface of the sheath pipe 12 to reduce travel resistance. (See Patent Document 1). The travel guide device is formed in a saddle band shape by fastening a split flange 42 having an L-shaped cross section divided into four at its end face.
JP 2002-276284 A

  Although the traveling of the new pipe 11 by the traveling guide device with casters 41 is effective as it is, it is necessary to provide a fastening piece 43 of sufficient size (sufficiently rising) to firmly fasten the split flange 42. Since the casters 41 are attached to the fastening pieces 43 with bolts and nuts 44, the casters 41 greatly protrude from the outer peripheral surface of the new pipe 11.

  If the casters 41 protrude greatly, the bulk of the travel guide device increases, and a sufficient gap (clearance) is required between the inner peripheral surface of the sheath 12 and the outer peripheral surface of the new tube 11. For this reason, since this gap becomes large, a pipe having a small nominal diameter is adopted as the new pipe 11, and a sufficient distribution area may not be obtained. Further, since the new pipe 11 is usually required to have a required nominal diameter, the gap is narrow. In this case, the case where the above-described traveling guide device with casters 41 cannot be employed occurs.

  Therefore, an object of the present invention is to provide a sheath tube propulsion method that can secure a sufficient distribution area and reduce the force of inserting a new tube, and a new tube used in the sheath tube propulsion method.

  In order to solve the above-mentioned problem, the sheath pipe propulsion method of the present invention attaches a sheet having a surface with a friction coefficient lower than the friction coefficient of the surface of the new pipe to the outer peripheral surface of the inlet of the new pipe, The new pipe is pushed while sliding the receiving port into the sheath pipe through the sheet.

  In this case, since the sheet has a surface with a coefficient of friction lower than that of the surface of the new pipe, the new pipe is inserted into the sheath pipe, and the receptacle is inserted into the sheath pipe through the sheet. When the shaft is pushed in the axial direction while being slid, the new pipe moves in the sheath with a small frictional resistance.

  Moreover, since the sheet | seat attached to the outer peripheral surface of the receptacle of a new installation pipe | tube is small, the clearance gap between a sheath pipe | tube and a new installation pipe | tube can be made small. Since the gap between the inner peripheral surface of the sheath and the outer peripheral surface of the new pipe can be reduced, the diameter of the new pipe can be increased to ensure a sufficient distribution area.

  As described above, according to the present invention, since the gap between the sheath inner peripheral surface and the new pipe outer peripheral surface can be reduced, the new pipe can be thickened to secure a sufficient distribution area. Further, since the new pipe moves through the sheath through the sheath with a small frictional resistance, the force for inserting the new pipe can be reduced.

  In the sheath pipe propulsion method according to the embodiment of the present invention, the insertion port of the new pipe having the insertion port at one end of the straight pipe portion and the reception port at the other end is inserted into the reception port of the other new installation pipe. In the sheath tube propulsion method in which the new pipe is axially propelled in the sheath pipe and the pipe is newly installed in the sheath pipe, the surface of the new pipe is placed on the outer peripheral surface of the new pipe receptacle. It is possible to employ a configuration in which a sheet having a surface with a friction coefficient lower than the friction coefficient is attached and the new pipe is propelled through the sheet while sliding the receiving port into the sheath pipe.

  In this configuration, the new pipe has a tapered portion whose diameter increases from the straight pipe portion toward the receiving port, and the sheet is attached from the outer peripheral surface of the receiving port to the outer peripheral surface of the tapered portion. It can be configured. Normally, if there is a step such as a seam in the sheath, the new pipe will run over the step at the receptacle of the new pipe and the taper portion of the straight pipe when moving. Therefore, if the seat is attached to the taper portion, the new pipe is smoothly moved when it is ridden, and the propulsion of the new pipe is not hindered.

  Moreover, the said sheet | seat is attached over the said straight pipe part from the outer peripheral surface of the said receiving port, and it can be set as the structure which binds the said sheet | seat to the said straight pipe part with a binding band. If the sheet is tied to the straight pipe part of the new pipe with a cable tie, this sheet is easy to adjust along the level difference between the receiving port and the straight pipe part. Regardless, it makes it easier to attach the seat. In addition, if a sheet | seat is tied up with a binding band, it can also be abbreviate | omitted apply | coating an adhesive agent to the sheet | seat attached to a newly installed pipe, or providing an adhesive layer.

  Further, the sheet has an elastic layer, and when the sheet is attached to the outer peripheral surface of the receiving port of the new pipe through the elastic layer, the elastic pipe is moved along with the movement of the new pipe. Since the body layer is deformed following the irregularities on the inner peripheral surface of the sheath and absorbs the external force acting on the outer peripheral surface of the receiving port of the new tube, the sheet is less likely to be damaged by friction with the sheath.

  On the other hand, the said sheet | seat can also be set as the structure which attaches the said sheet | seat to the outer peripheral surface of the opening of the said new pipe through the metal layer through the metal layer. Since the metal layer has higher rigidity than the normal sheet and does not follow the unevenness on the surface of the new pipe, the unevenness on the surface of the sheet becomes smaller than the unevenness on the surface of the new pipe when the metal layer is interposed. If the unevenness on the surface of the sheet is reduced, the coefficient of friction on the surface of the sheet is reduced, so that the sheet is less likely to be damaged due to friction with the sheath when the new pipe is moved.

  As a new pipe for the sheath pipe propulsion method according to the embodiment of the present invention, in the new pipe for the sheath propulsion method, an insertion port is provided at one end of the straight pipe portion and a receiving port is provided at the other end. The structure attached to the outer peripheral surface of the said receptacle can be employ | adopted.

  An embodiment of the present invention is shown in FIG. In this embodiment, as shown in FIG. 14, the new pipe 11 having a smaller diameter is inserted into the sheath pipe 12 embedded between the start shaft 31 and the arrival shaft 32. A new pipe line is provided in the sheath pipe 12 while the insertion opening 13 of the new pipe 11 is inserted into the receiving opening 14 of the preceding new pipe 11 and joined together. As the new pipe 11, a PI-type or PII-type ductile cast iron pipe or the like is used. This tag tile cast iron pipe is provided with an insertion port 13 at one end of a straight pipe portion 15 and a receiving port 14 at the other end. The outer diameter of the receiving port 14 is larger than the outer diameter of the straight pipe portion 15. Is formed.

  First, as shown in FIG. 1, a sheet 16 is attached to a part of the outer peripheral surface of the receiving port 14 of the new pipe 11. The sheet 16 has a surface friction coefficient lower than that of the surface of the new pipe 11. For example, high molecular weight polyethylene, tetrafluoroethylene (Teflon (registered trademark)), or the like may be used. it can.

  Next, the portion of the receiving port 14 to which the sheet 16 of the new tube 11 is attached is inserted into the sheath tube 12 toward the bottom side of the inner peripheral surface of the sheath tube 12, and the receiving port 14 is sheathed via the sheet 16. The new pipe 11 is propelled in the sheath pipe 12 in the axial direction while sliding in the pipe 12 (see FIG. 3). At this time, since the sheet 16 has a surface with a friction coefficient lower than that of the surface of the new pipe 11, the new pipe 11 is compared with a case where the sheet 16 is not attached to the new pipe 11. The sheath tube 12 can be moved with a small frictional resistance, and the insertion force of the new tube 11 can be reduced.

  After the new pipe 11 is axially propelled in the sheath pipe 12, the receptacle 14 of the new pipe 11 is inserted into the sheath pipe 12 so that the sheet 16 faces the bottom of the inner peripheral surface of the sheath pipe 12. To do. While inserting the insertion port 13 of the newly inserted new pipe 11 into the receiving port 14 of the preceding new installation pipe 11 and joining them together, the new installation pipe until the insertion opening 13 of the earliest new installation pipe 11 reaches the reaching shaft 32 By sequentially inserting 11, a pipe line can be provided in the sheath pipe 12.

  In the sheath pipe propulsion method of this embodiment, since the insertion force of the new pipe 11 is reduced, the hydraulic jack 33 and the reaction force receiver 34 used for propulsion of the new pipe 11 shown in FIG. can do. Moreover, since the movement distance in the sheath pipe 12 of the newly installed pipe 11 can be extended, the number of vertical shafts (starting vertical shaft 31 and reaching vertical shaft 32) can also be reduced.

  Further, as shown in FIG. 1B, since the sheet 16 attached to the outer peripheral surface of the receiving port 14 of the new pipe 11 has a small thickness, the inner peripheral surface of the sheath 12 and the outer peripheral surface of the new pipe 11 And the clearance between them can be reduced. Since the gap between the inner peripheral surface of the sheath 12 and the outer peripheral surface of the new pipe 11 can be reduced, the diameter of the new pipe 11 can be increased to ensure a sufficient flow area.

  Another embodiment of the sheath pipe propulsion method is shown in FIG. As shown in the figure, this embodiment is different from the above-described embodiment in that the seat 16 is attached to the entire outer periphery of the receiving port 14 of the new pipe 11. Other configurations are the same as those in the above-described embodiment.

  By attaching the sheet 16 to the entire circumference of the outer peripheral surface of the receiving port 14, when inserting the new pipe 11, the portion of the receiving port 14 to which the sheet 16 is attached needs to be directed to the bottom side of the inner peripheral surface of the sheath 12 Disappears. Further, when the new pipe 11 is moved, even if the new pipe 11 rolls (rotates), the surface of the new pipe 11 and the inner peripheral surface of the sheath 12 are not in direct sliding contact, and the sheet 16 and the sheath 12 are always in contact. Since the sliding of the inner peripheral surface of the pipe 11 can prevent the frictional resistance during the movement of the new pipe 11 from increasing (see FIG. 4B).

  As shown in FIG. 5, the sheet 16 is formed with a width in the axial direction of the receiving port 14 of the new pipe 11 (see FIG. 5A), or is formed into a belt with a predetermined width. A plurality of sheets may be wound so as to overlap each other (see FIG. 5B), or may be formed in a band shape having a predetermined width and wound in a spiral shape (see FIG. 5C).

  Further, another embodiment of the sheath tube propulsion method is shown in FIG. In this embodiment, as shown in FIG. 1, the seat 16 is attached to the outer peripheral surface of the tapered portion 21 extending from the receiving port 14 of the new pipe 11 to the straight pipe portion 15 as shown in FIG. Different from the embodiment. Other configurations are the same as those of the embodiment shown in FIG.

  In this embodiment, as shown in FIG. 7, the seat 16 is attached to the outer peripheral surface of the tapered portion 21 extending from the receiving port 14 of the new pipe 11 to the straight pipe portion 15. When the seat 16 is attached to the outer peripheral surface of the taper portion 21, even if there is a step 22 such as a seam in the sheath 12, the step 22 is climbed by the taper portion 21 to which the seat 16 is attached when the new pipe 11 is moved. Therefore, the new pipe 11 moves smoothly and does not hinder the promotion of the new pipe 11.

  FIG. 8 shows another embodiment of the sheath pipe propulsion method. In this embodiment, as shown in FIG. 4, the seat 16 is attached over the entire circumference of the outer peripheral surface of the tapered portion 21 extending from the receiving port 14 of the new pipe 11 to the straight pipe portion 15. This is different from the embodiment shown in FIG. Other configurations are the same as those of the embodiment shown in FIG.

  In this embodiment, as in the above-described embodiment shown in FIG. 6, even if there is a step such as a seam in the sheath 12, the tapered portion 21 to which the sheet 16 is attached when the new tube 11 is moved. Therefore, the new pipe 11 moves smoothly and does not hinder the promotion of the new pipe 11.

  In this embodiment, as shown in FIG. 12, the sheet 16 formed to have a predetermined width may be spirally wound from the outer peripheral surface of the receiving port 14 of the new pipe 11 to the tapered portion 21. If it does in this way, the sheet | seat 16 can be attached to the taper part 21 of the new installation pipe 11 without a flaw.

  Another embodiment of the sheath pipe propulsion method is shown in FIG. In this embodiment, as shown in the figure, the sheet 16 is attached from the outer peripheral surface of the receiving port 14 to the straight pipe portion 15, and both ends of the sheet 16 are attached to the straight pipe portion 15 of the new pipe 11 with a tie band 20. It is what you bind.

  In this embodiment, since the sheet 16 is tied to the straight pipe portion 15 of the new pipe 11 with the binding band 20, the sheet 16 can be easily adapted along the step between the receiving port 14 of the new pipe 11 and the straight pipe portion 15. Regardless of the difference in diameter between the receiving port 14 of the new pipe 11 and the straight pipe portion 15, the seat 16 can be easily attached. In addition, since the sheet | seat 16 is bound by the binding band 20, it can also be abbreviate | omitted to apply | coat an adhesive agent to the sheet | seat attached to a new installation pipe | tube, or to provide an adhesive layer.

  Further, since the seat 16 is attached to the outer peripheral surface of the tapered portion 21 extending from the receiving port 14 of the newly installed pipe 11 to the straight pipe portion 15, as in the case of the embodiment shown in FIGS. Even if there is a step such as a seam in the sheath 12, when the new pipe 11 is moved, the step is climbed by the tapered portion 21 to which the sheet 16 is attached, so that the new pipe 11 moves smoothly and the new pipe 11 Does not interfere with promotion.

  The sheet 16 may be provided with an adhesive layer 17 on one side as shown in FIG. This is because the sheet 16 can be easily attached to the outer peripheral surface of the receiving port 14 of the new pipe 11 by providing the adhesive layer 17. Further, without applying the adhesive layer 17, after applying an adhesive to one side of the sheet 16, the sheet 16 may be attached to the outer peripheral surface of the receiving port 14 of the new pipe 11.

  The sheet 16 may have an elastic layer 18. As the elastic layer 18, chloroprene rubber or the like can be used. By attaching the sheet 16 to the outer peripheral surface of the receiving port 14 of the new pipe 11 via the elastic layer 18, the elastic layer 18 moves along the sheath pipe 12 when the new pipe 11 moves. It deforms following the unevenness of the inner peripheral surface and absorbs external force acting on the outer peripheral surface of the receiving port 14 of the new pipe 11. At this time, when the elastic body layer 18 is provided rather than the width W1 of the sliding contact surface between the sheet 16 and the sheath 12 inner peripheral surface when the elastic body layer 18 is not provided (see FIG. 11A). The width W2 of the sliding contact surface is increased (see FIG. 11B). When the width of the sliding contact surface increases, the load per unit area decreases, and the frictional resistance against the inside of the sheath 12 decreases, so that the sheet 16 is not easily damaged. When the adhesive layer 17 is provided on the sheet 16, it may be provided on the elastic layer 18 side as shown in FIG.

  The sheet 16 may have a metal layer 19 instead of the elastic layer 18. When the sheet 16 is attached to the outer peripheral surface of the receiving port 14 of the new pipe 11 through the metal layer 19, the metal layer 19 covers the surface of the new pipe 11 and does not follow the irregularities on the surface of the new pipe 11. The unevenness on the surface of the sheet 16 is smaller than the unevenness on the surface of the new pipe 11. When the unevenness on the surface is reduced, the friction resistance with the sheath 12 is reduced when the newly installed pipe 11 is moved, so that the sheet 16 is hardly damaged. Even when the adhesive layer 17 is provided on the sheet 16, as in the case of the elastic layer 18, the adhesive layer 17 may be provided on the metal layer 19 side as shown in FIG.

  Moreover, as shown in FIG. 13, the said sheet | seat 16 can also be formed in roll shape. If it does in this way, the roll-shaped sheet | seat 16 can be cut out to the outer peripheral length of the receiving port 14, and can be easily attached to the outer peripheral surface of the receiving port 14 before insertion of the new installation pipe | tube 11. Moreover, the roll-shaped sheet | seat 16 should just be the width | variety with which the width | variety is attached to the receptacle 14 and the said taper part of the new installation pipe | tube 11. FIG.

(A) Partial cut front view showing main part of sheath pipe propulsion method of one embodiment, (b) Sectional view taken along line AA shown in (a) Sectional view showing the same sheet Partially cut front view showing the moving state of the new pipe (A) A partially cut front view showing the main part of the sheath tube propulsion method of another embodiment, (b) A sectional view taken along line BB shown in (a) The perspective view which shows the shape of a sheet | seat same as the above Partially cut front view showing the main part of the sheath pipe propulsion method of another embodiment Front view showing the moving state of the new pipe Front view showing the main part of the sheath tube propulsion method of another embodiment Partially cut front view showing the main part of the sheath pipe propulsion method of another embodiment Sectional drawing which shows the sheet | seat of the sheath pipe propulsion method of one Example Sectional view showing the seat when sliding the new pipe of the sheath pipe propulsion method Front view showing the main part of the sheath tube propulsion method of another embodiment The perspective view which shows the sheet | seat of the sheath pipe propulsion method of one Example Illustration of sheath tube propulsion method Schematic diagram of conventional sheath tube propulsion method Schematic showing the main part of the conventional sheath tube propulsion method

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Newly installed pipe 12 Sheath pipe 13 Insertion opening 14 Receptacle 15 Straight pipe part 16 Sheet | seat 17 Adhesion layer 18 layer (layer of an elastic body)
DESCRIPTION OF SYMBOLS 19 Metal layer 20 Binding band 21 Taper part 31 Starting shaft 32 Reaching shaft 33 Hydraulic jack 34 Reaction force receiver 35 Push angle 36 Leading sled 41 Caster 42 Flange 43 Fastening piece 44 Bolt and nut

Claims (4)

The other pipe (11) preceding the insertion opening (13) of the new pipe (11) having the insertion opening (13) at one end of the straight pipe section (15) and the receiving opening (14) at the other end. Saddle tube propulsion in which the new pipe (11) is axially propelled in the sheath pipe (12) by inserting it into the receiving port (14), and the pipe is newly established in the sheath pipe (12). In the construction method,
A sheet (16) having a friction coefficient lower than that of the surface of the new pipe (11) is attached to the outer peripheral surface of the receiving port (14) of the new pipe (11), and the sheet (16) is attached. through the to propel new tube (11) while sliding said receptacle (14) in the sheath tube (12), the said seat (16), the straight pipe portion from the outer peripheral surface of the socket (14) A sheath tube propulsion method characterized by being attached to (15) and binding the sheet (16) to the straight pipe portion (15) with a tie tie (20). The sheet (16) has an elastic layer (18), and the sheet (16) is disposed on the outer peripheral surface of the receiving port (14) of the new pipe (11) through the elastic layer (18). The sheath tube propulsion method according to claim 1 , wherein the sheath tube propulsion method is attached to the sheath. The sheet (16) has a metal layer (19), and the sheet (16) is attached to the outer peripheral surface of the opening (14) of the new pipe (11) through the metal layer (19). The sheath pipe propulsion method according to claim 1 . A seat (16) according to any one of claims 1 to 3 , wherein the straight pipe portion (15) is a sheath pipe with a slot (13) provided at one end and a receptacle (14) provided at the other end. ) Is attached to the outer peripheral surface of the receiving port (14), and a new pipe for a sheath pipe propulsion method.

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