JP2007278376A - Technique for piping in sheath pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping technique for inserting a hollow pipe body into a sheath pipe in which an inclined portion and a horizontal portion are both formed, with small propulsive force. <P>SOLUTION: Liquid 15 is stored in the sheath pipe 13. An air layer 19 is formed in at least the horizontal portion 18. The hollow pipe body 14 is inserted into the sheath pipe 13 while utilizing the buoyancy of the stored liquid 15 for floating it. At this time, the hollow pipe body 14 is inserted thereinto in the state of being separated form the inner peripheral face of the sheath pipe 13 via the formed air layer 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a piping method into a sheath tube in which a hollow tube body is inserted into a sheath tube embedded from a main tube insertion side shaft to a main tube arrival side shaft.

  When laying hollow pipes such as water pipes and gas pipes between shafts that have been excavated at appropriate intervals, in the construction method that excavates the laying area from the ground and embeds it, Traffic control on the ground will be necessary, and construction will be much larger.

  For this reason, the construction method which inserts a hollow pipe body from the underground to the horizontal direction from the main pipe insertion side shaft to the main tube arrival side shaft has been proposed.

  However, if this hollow tube body is directly buried in the ground, the hollow tube body is damaged by sliding contact with the ground, etc., and corrosion and the like become severe, making it impossible to use for a long time.

Therefore, a sheath pipe such as a fume pipe is buried in advance between the compatible pits by a propulsion method or a shield method, and then a hollow tube body is inserted into the sheath pipe from the main pipe insertion side shaft to the main arrival side shaft. Finally, air mortar or the like is filled between the hollow tube body and the sheath tube to be integrated. Conventionally, when a hollow tube body is inserted into the sheath tube, a buffer is attached around the hollow tube body and inserted while sliding the inner wall surface of the sheath tube.

  However, there has been a problem that as the extension of the pipe of the hollow tube becomes longer, a larger insertion force is required, and the apparatus for that purpose becomes larger.

  Conventionally, a method of providing a roller between the hollow tube body and the sheath tube instead of the buffer body has also been proposed. In such a roller configuration, a roller is provided between the hollow tube body and the sheath tube. By providing, the diameter of a sheath pipe will be determined according to this. As a result, the diameter of the sheath tube becomes larger compared to the case where a buffer is provided around the tube body, and as a result, the amount of air mortar to be filled between the hollow tube body and the sheath tube increases. End up. Further, the insertion force is not as great as that in the case where a buffer is provided around the tube body, but as the pipe extension of the hollow tube body becomes longer, a larger insertion force is required, which does not solve the problem.

  For this reason, while solving this problem, the method of inserting a hollow tube body in a sheath tube with a smaller thrust is proposed in recent years (for example, refer patent document 1).

  In this method, for example, as shown in FIG. 9, when the hollow tube body 32 is inserted into the sheath pipe 31 buried between the compatible shafts, the open end of the sheath pipe 31 on the main pipe arrival side shaft 33 side is blindly covered. Water 36 that reaches a predetermined water level is supplied into the sheath pipe 31 that is sealed with a sealing member 35 provided at the opening end on the main pipe insertion side shaft 34 side. Then, while floating the hollow tube body 32 in the water 36, an appropriate amount of water is put into the main tube to adjust the buoyancy of the main tube with respect to the water in the sheath tube. Is inserted into the sheath tube 31 in a state where they are substantially matched.

  In this tubular body insertion mechanism, since the hollow tubular body is inserted into the sheath tube storing the liquid using buoyancy, the insertion force can be minimized.

  However, the disclosed technique disclosed in Patent Document 1 is an effective method in the case where both the inclined portion and the horizontal portion are formed alone in the sheath tube 31. For this reason, when both the inclined part and the horizontal part were formed in the sheath tube, there was a problem that the insertion force of the hollow tube could not be reduced.

  Incidentally, Patent Document 2 proposes a construction method in which a liquid is stored inside a sheath pipe embedded in the horizontal direction, and a hollow tube body is inserted therein.

  However, the disclosed technique of Patent Document 2 is a construction method that can suppress the insertion force only for the sheath pipe that is buried in the horizontal direction, and the distance becomes longer when the slope section is provided in the sheath pipe. As the insertion force increases, the versatility is inferior.

That is, there has been a need to propose a construction method capable of realizing easy and quick insertion with a small driving force with respect to the sheath tube in which both the inclined portion and the horizontal portion are formed.
Japanese Patent No. 3278275 JP 2000-291827 A

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to provide a hollow with a small propulsive force with respect to the sheath tube in which both the inclined portion and the horizontal portion are formed. An object of the present invention is to provide a piping method into a sheath pipe into which a pipe body can be inserted.

  In order to solve the above-described problems, the pipe construction method into the sheath pipe to which the present invention is applied is an inclined portion inclined obliquely downward from the main pipe insertion side vertical shaft to the main pipe arrival side vertical shaft and a horizontal extending horizontally. In a pipe construction method for inserting a hollow tube into a sheath tube embedded so that at least a portion is formed, a liquid storage step for storing liquid in the sheath tube, and an air layer at least in the horizontal portion An air layer forming step for forming the hollow tube body, and a tube body insertion step for inserting the hollow tube body into the sheath tube while floating using the buoyancy of the stored liquid. In the tube body insertion step, The hollow tube body is inserted in a state of being separated from the inner peripheral surface of the sheath tube through the formed air layer.

  In order to solve the above-described problems, the pipe construction method into the sheath pipe to which the present invention is applied is embedded so that at least an inclined portion inclined obliquely from the main pipe insertion side shaft to the main pipe arrival side shaft is formed. In the pipe construction method for inserting a hollow tube into the sheath tube, the liquid storage step of storing liquid in the sheath tube, the air layer formation step of forming an air layer at least in the inclined portion, A tubular body inserting step of inserting the hollow tubular body into the sheath tube while floating using the buoyancy of the stored liquid, and in the tubular body inserting step, the hollow tubular body is formed as described above. It inserts in the state spaced apart from the inner peripheral surface of the said sheath pipe through the air layer.

  In the construction method using the tube insertion device to which the present invention is applied, the liquid is stored in the sheath tube, an air layer is formed at least in the horizontal portion, and the hollow tube is used by utilizing the buoyancy of the stored liquid. Insert into the sheath tube while floating. As a result, the hollow tube body can be inserted in a state of being separated from the inner peripheral surface of the sheath tube through the air layer formed as described above, and the propulsive force accompanying the insertion can be greatly reduced. It becomes. In particular, in the present invention, when there are portions where the inclination angle of the sheath tube is different, such as when the inclined portion and the horizontal portion are formed in the sheath tube, the propulsive force of the hollow tube body is greatly reduced. In addition, it is particularly useful in that a hollow tube body can be embedded in a sheath tube adopting a complicated shape, and it can be said to be a more versatile construction method.

  In addition, in the present invention, in addition to the construction cost reduction by reducing the propulsive force of the hollow tube body, construction is possible not only when the main pipe insertion side vertical shaft but also the main pipe arrival side vertical shaft is shallow, The construction cost can also be reduced.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a longitudinal side view showing an embodiment of a tube insertion device 1 into a sheath tube using buoyancy according to the present invention. This tubular body insertion device 1 includes a sheath pipe 13 such as a steel pipe or a fume pipe buried in the ground from the main pipe insertion side shaft 11 to the main pipe arrival side shaft 12, and a medium to be inserted into the sheath pipe 13. And an empty tube body 14.

  The sheath pipe 13 has an inclined part 17 inclined downward from the main pipe insertion side shaft 11 to the main arrival side shaft 12, and a horizontal line extending in the horizontal direction from the inclined part 17 to the main arrival side shaft 12. And at least a portion 18.

  In the sheath tube 13, in order to give an appropriate buoyancy to the hollow tube body 14, at least the horizontal portion 18 is filled with the liquid 15 in a full state. The sheath pipe 13 may be fixed in a state of protruding into the main pipe insertion side shaft 11 and the main pipe arrival side shaft 12.

  The hollow tube body 14 is constituted by a hollow gas pipe or water pipe having a substantially circular cross section. When the hollow tube body 14 is inserted into the sheath tube 13, the hollow tube body 14 is pushed upward by the buoyancy of the liquid 15 stored in the inside thereof.

  The liquid 15 is assumed to be, for example, water, seawater, mud water, but is not limited to this, and any liquid may be applied as long as it is liquid.

  An air layer 19 into which air is injected is formed in the sheath tube 13. An air blocking mechanism 20 for preventing air leakage is attached in advance to the end of the air layer 19.

  FIG. 2 is an enlarged view of the air blocking mechanism 20. As shown in FIG. 2, the air blocking mechanism 20 is made of a so-called elastic material made of rubber or resin. One end of the air blocking mechanism 20 is bent so as to have a curvature along the inner peripheral surface of the sheath tube 13, and the other end is bent so as to have a curvature along the outer periphery of the hollow tube body 14. . The inner peripheral surface is sealed so that air does not leak from the air layer. As a specific means for this sealing, for example, an anchor bolt (not shown) is used on the inner peripheral surface of the sheath tube 13 or an anchor bolt and an adhesive are used in combination to improve the adhesion. You may make it join.

  The air blocking mechanism 20 may be bolted to a screw hole (not shown) drilled in advance on the inner peripheral surface of the sheath tube 13.

  The tubular body insertion device 1 further includes a compressor 23 and a drainage pump 29. The compressor 23 injects air into the air layer 19. The drainage pump 29 sucks up the liquid level that accompanies the insertion of the hollow tube body 14 and the liquid stored in the sheath tube 13 at the end of the piping.

  A method for actually inserting the hollow tube 14 into the sheath tube 13 in the tube insertion device 1 having the above-described configuration will be described below.

  First, the sheath tube 13 is buried between the compatible wells. As a method for burying the sheath tube 13, a known propulsion method, shield method, or the like may be applied. In such a case, the sheath tube 13 is pushed forward sequentially after the shield machine to be propelled. In the present invention, the sheath tube 13 is embedded so that the inclined portion 17 inclined downward and the horizontal portion 18 extended in the horizontal direction are formed.

  After the burying of the sheath tube 13 is finished, the air blocking mechanism 20 is attached to the end of the region where the formation of the air layer 19 is attempted.

  Next, a water pipe (not shown) is connected to the sheath pipe 13 embedded from the main pipe insertion side shaft 11 to the main pipe arrival side shaft 12.

  Next, the hollow tube body 14 is inserted into the sheath tube 13, and the liquid 15 is injected into the sheath tube 13 through the water tube, and these are stored. And using the compressor 23, air is inject | poured with respect to the area | region where the air interruption | blocking mechanism 20 is attached to the edge part. As a result, an air layer 19 is formed.

  Next, after the formation of the air layer 19 is finished, the hollow tube body 14 is continuously inserted toward the inside of the sheath tube 13. When the hollow tube body 14 is inserted, for example, a rail 30 and a traveling frame 51 as shown in Japanese Patent Application Laid-Open No. 2000-291827 may be used. Further, regarding the insertion of the hollow tube body 14 into the sheath tube 13, the hollow tube body 14 may be pushed forward from the main tube insertion side shaft 11 side, or as shown in FIG. A wire 26 is attached to the rear end of the hollow tubular body 14 in the insertion side shaft 11, a tow 27 is connected to the end of the wire 26, and the tow 27 is pulled up in a substantially vertical direction. You may make it insert.

  The hollow tube body 14 inserted into the sheath tube 13 receives buoyancy with respect to the liquid 15 stored therein. In particular, since the inside of the sheath tube 13 is filled with the liquid 15, the hollow tube body 14 inserted therein is immersed in the liquid 15 and receives buoyancy. As a result, the hollow tube body 14 is pushed upward if the buoyancy exceeds its weight.

  FIG. 3 shows a state in which the distal end of the hollow tube body 14 is inserted to the horizontal portion 18. As shown in FIG. 3, the hollow tube body 14 is pushed upward by buoyancy, and as a result, its tip reaches the air layer 19. However, the presence of the air layer 19 prevents the hollow tube body 14 from directly contacting the inner peripheral surface of the sheath tube 13.

  FIG. 4A shows a side configuration of the hollow tube body 14 that is pushed up by this buoyancy and reaches the air layer 19, and FIG. 4B shows a cross-sectional configuration thereof.

  The lower side of the hollow tube body 14 is in contact with the liquid 15, and the upper side thereof is in contact with the air layer 19 or the air blocking mechanism 20. For this reason, the hollow tube body 14 is in a state of being in contact with only the liquid or gas over almost the entire surface, and is not in contact with the inner peripheral surface of the sheath tube 13. For this reason, the friction coefficient at the time of insertion of the hollow tube body 14 can be significantly reduced. The air shut-off mechanism 20 is composed of an elastic member as described above, and is supported by the air layer 19, so that the friction coefficient increases greatly even when it contacts the hollow tube body 14. There is no. Note that the height x of the air layer shown in FIG. 4B is preferably set in the range of 70 to 410 mm by performing buoyancy calculation according to the specifications (diameter, wall thickness, etc.) of the hollow tube body.

  Thus, in the present invention, the hollow tube body 14 can be inserted into the sheath tube 13 with a smaller driving force. This propulsive force requires about 3 t in the conventional method without the air layer 19, whereas in the present invention, the propulsive force can be reduced to about 1 t.

  In this manner, when the hollow tube body 14 is inserted over the entire length of the sheath tube 13 and the tip of the hollow tube body 14 reaches the main pipe arrival side shaft 12, the drainage pump 29 is turned on. Utilizing this, the liquid 15 in the sheath tube 13 is discharged.

  By this drainage, the hollow tube body 14 pushed up to the upper part of the inner peripheral surface of the sheath tube 13 is gradually lowered. And it drains to such an extent that the hollow tube 14 does not float with respect to the bottom face of the sheath tube 13. When this drainage is completed, the hollow tube body 14 is placed on the lower inner peripheral surface of the sheath tube 13.

  Next, air mortar is filled and integrated in the gap between the inner peripheral surface of the sheath tube 13 and the outer peripheral surface of the hollow tube body 14. Thereby, it becomes possible to embed the hollow tube body 14 penetrating from the main tube insertion side shaft 11 to the main tube arrival side shaft 12.

  That is, in the construction method using the tube insertion device 1 to which the present invention is applied, the liquid 15 is stored in the sheath tube 13, the air layer 19 is formed at least in the horizontal portion 18, and the hollow tube 14 is stored as described above. The liquid 15 is inserted into the sheath tube 13 while floating using the buoyancy of the liquid 15. Thereby, the hollow tube body 14 can be inserted in a state of being separated from the inner peripheral surface of the sheath tube 13 through the air layer 19 formed as described above, and the propulsive force accompanying the insertion is greatly reduced. It becomes possible. In particular, in the present invention, the propulsion of the hollow tube body 14 is performed when there are portions having different inclination angles of the sheath tube 13, such as when the inclined portion 17 and the horizontal portion 18 are formed in the sheath tube 13. This is particularly useful in that the force can be reduced at a lower cost. That is, since the hollow tube 14 can be embedded also in the sheath tube 13 adopting a complicated shape, the present invention can be said to be a more versatile construction method.

  FIG. 5 shows an inclined portion 17 a inclined downward from the main insertion side shaft 11 toward the main arrival shaft 12, a horizontal portion 18 extending horizontally from the inclined portion 17, and the horizontal portion 18. The example which inserts the hollow pipe body 14 with respect to the sheath pipe 13 which has the inclination part 17b inclined upwards from the main pipe arrival side shaft 12 is shown. In such a case, when the air layer 19 is formed, the hose 32 connected to the compressor 23 is inserted to the horizontal portion 18. Then, the air from the compressor 23 is sent to the horizontal portion 18 through the hose 32.

  When the horizontal portion 18 is formed in the center of the inclined portions 17a and 17b, friction caused by contact between the inner peripheral surface of the sheath tube 13 and the hollow tube body 14 is prevented particularly in the horizontal portion 18. Necessity comes out. For this reason, in the present invention, the air layer 19 is formed on the horizontal portion 18 to prevent contact between the inner peripheral surface of the sheath tube 13 and the hollow tube body 14, and the insertion force of the hollow tube body 14. Is reduced.

  The present invention is not limited to the case where the air layer 19 is formed with respect to the horizontal portion 18. For example, as shown in FIGS. 6 to 8, an air layer 19 may be formed on the inclined portion 17 of the sheath tube 13.

  FIG. 6 shows an example in which the hollow tube body 14 is inserted into the sheath tube 13 composed only of the inclined portion 17. The air blocking mechanism 20 is formed on the inner peripheral surface of the sheath tube 13 at a predetermined interval. That is, the region to be the air layer 19 exists in a state where it is divided into a plurality of locations by the air blocking mechanism 20.

  In this state, when air is injected from the compressor 23 into the region that should become the air layer 19 closest to the main pipe reaching side shaft 12, the region is filled with air, and the overflowed air is The air layer 19 that is separated from the shaft 12 is sequentially injected, and all the air layer 19 is filled with air.

  When the hollow tube 14 is inserted into such a sheath tube 13, the outer periphery of the hollow tube 14 contacts the inner peripheral surface of the sheath tube 13 due to the presence of the air layer 19 formed on the upper surface of the inclined portion 17. The insertion force can be reduced. In particular, as shown in FIG. 6, a hollow pipe body is provided in the sheath tube 13 filled with the liquid 15 while providing a sealing material 60 at the opening end of the sheath tube 13 to the main shaft insertion side shaft 11 to stop water. 14 is inserted, the inner peripheral surface of the inclined portion 17 and the hollow tube body 14 may come into contact with each other. Useful.

  FIG. 7 shows an example in which an air layer 19 is formed on both the inclined portion 17 and the horizontal portion 18 when the sheath tube 13 is constituted by the inclined portion 17 and the horizontal portion 18. In such a case, the insertion force can be reduced similarly. By injecting air from the compressor 23 only into the air layer 19 that can be formed in the horizontal portion 19, the air layer 19 formed in the inclined portion 17 can be filled with air in the same manner as described above. .

  FIG. 8 shows an example in which an air layer 19 is formed on the inclined portion 17a and the horizontal portion 18 in the sheath tube 13 in which the horizontal portion 18 is formed at the center of the inclined portions 17a and 17b. In such a case, the insertion force can be reduced similarly. Air from the compressor 23 is sent to the horizontal portion 18 through the hose 32.

  Note that the present invention is not limited to the above-described embodiment, and it is needless to say that the air layer 19 may be divided into a plurality of parts.

It is a figure for demonstrating about the structure for implement | achieving the piping construction method in the sheath pipe to which this invention is applied. It is a figure which shows the expanded structure of an air interruption | blocking mechanism. It is a figure which shows the state which inserted the front-end | tip of this hollow tube body to a horizontal part. (a) is a side block diagram of a hollow tubular body that has been pushed up by buoyancy to reach the air layer, and (b) is a cross-sectional block diagram thereof. It is a figure which shows the example which inserts a hollow tube body with respect to the sheath tube in which the horizontal part is formed in the center of an inclination part. It is a figure which shows the example which inserts a hollow tube body in the sheath tube comprised only by the inclination part. It is a figure which shows the example which forms an air layer in both an inclination part and a horizontal part, when a sheath pipe is comprised in an inclination part and a horizontal part. It is a figure which shows the example which formed the air layer in the inclination part and the horizontal part in the sheath pipe in which the horizontal part is formed in the center of an inclination part. It is a figure shown about the prior art example which inserts a hollow tube body in a sheath pipe more correctly with a small thrust.

Explanation of symbols

1, 2 Tube insertion device 11 Main pipe insertion side shaft 12 Main tube arrival side shaft 13 Sheath tube 14 Hollow tube 15 Liquid 17 Inclined portion 18 Horizontal portion 19 Air layer 20 Air blocking mechanism

Claims (6)

A hollow tube is inserted into a sheath pipe embedded so that at least an inclined part inclined downward from a main pipe insertion side shaft to a main arrival side vertical shaft and a horizontal part extending in the horizontal direction are formed. In the piping method into the sheath pipe,
A liquid storage step of storing liquid in the sheath tube;
An air layer forming step of forming an air layer in at least the horizontal portion;
A tube insertion step of inserting the hollow tube into the sheath tube while floating using the buoyancy of the stored liquid,
In the tubular body insertion step, the hollow tubular body is inserted in a state of being separated from the inner peripheral surface of the sheath tube through the formed air layer. The method for piping into a sheath pipe according to claim 1, wherein, in the air layer forming step, an air layer is further formed on the inclined portion. In the pipe construction method into the sheath pipe in which the hollow tube body is inserted into the sheath pipe embedded so as to form at least an inclined portion inclined obliquely from the main pipe insertion side shaft to the main pipe arrival side shaft,
A liquid storage step of storing liquid in the sheath tube;
An air layer forming step of forming an air layer at least on the inclined portion;
A tube insertion step of inserting the hollow tube into the sheath tube while floating using the buoyancy of the stored liquid,
In the tubular body insertion step, the hollow tubular body is inserted in a state of being separated from the inner peripheral surface of the sheath tube through the formed air layer. A step of attaching an air blocking mechanism for preventing air leakage to the inner peripheral surface of the sheath tube in advance;
The said air layer is formed in the said air layer formation process by inject | pouring air into the area | region where the said air shut-off mechanism is attached in the edge part. Plumbing method into the described sheath tube. 5. The piping method into a sheath pipe according to claim 1, wherein in the air layer forming step, the air layer is formed in a plurality of locations. At least an inclined portion inclined downward from the main shaft insertion side shaft to the main arrival shaft is formed, a horizontal portion extending in the horizontal direction, and an inclined portion inclined further upward from the horizontal portion. The piping method into a sheath pipe according to any one of claims 1 to 5, wherein the hollow tube body is inserted into the sheath pipe buried as described above.

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