JP2006057443A - Method of construction of propelling sheath pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bring a sealing mechanism of a buoyant material (a) into correspondence with a change in an outer diameter of a new pipe 2 at the time the new pipe 2 is propelled and inserted by receiving buoyant force. <P>SOLUTION: In the case of a direct pipe part, the amount of supply of a fluid b to shrinking and swelling tubes 12a, 12b for sealing is increased. Then at the time of the transition from the direct pipe part to a joint part, a supply pressure is decreased (the fluid is discharged) in accordance with a change in a diameter with the transition, thus an appropriate contact pressure is realized. When the action opposite to it is performed at the time of transition from the joint part to the direct pipe part, and the degree of expansion of the tube 12 is adjusted, an appropriate contact pressure can be obtained even when there is a change in a diameter on the outer peripheral surface of the new pipe 2. Thus a leak of the buoyant material (a) can be prevented with reliability. Then a cap, which is put on the head of the new pipe 2 inserted in the forefront, is engaged with a jig at the other end of a sheath pipe 1, thus the new pipe is centered. The buoyant material (a) is adopted which hardens after the whole new pipe 2 is inserted to the sheath pipe 1, and also serves as a filling material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In this invention, when a new pipe is inserted into a sheath pipe to construct a pipeline, a sheath propelling method for inserting the new pipe by injecting a buoyant material into the sheath pipe to give buoyancy to the new pipe, and the sheath The present invention relates to a tube end closing structure and a cylindrical body used therefor.

Steel pipes and ductile iron pipes are used for fluid transportation in various fields such as water and sewage, agricultural water, industrial water, etc., and these pipes are usually buried in the ground and have recently been updated. There is a need to do that.
For example, for the construction (embedding) of pipes using ductile cast iron pipes and the replacement (updating) of old pipes, an open-cut method in which pipes are buried by excavating the ground is generally employed.
However, due to recent traffic conditions and the construction of complex pipelines in the city center and the like, it is difficult to newly construct pipelines by the open-cut method or to replace old pipelines. For this reason, the sheath tube propulsion method and the pipe-in-pipe method are employed as methods that replace the open-cut method.

  As shown in FIG. 16, the sheath tube propulsion method cuts only the start pit S and the arrival mine T on the ground W, and from the start pit S, first, a fume tube or a steel tube as the sheath tube 1 is put into the soil W. A new pipe 2 such as a ductile cast iron pipe having a diameter smaller than the sheath pipe diameter from one end (starting pit) S to the other end (arrival pit) T is placed inside the sheath pipe 1 that is propulsion buried. It is a method of inserting sequentially while joining, and is usually adopted for construction of new pipes.

In addition, the pipe-in-pipe construction method uses the existing pipe buried in the soil as the sheath pipe 1, and in the existing pipe 1 as with the sheath pipe propulsion construction method, using the hydraulic jack J or the like from the existing pipe diameter. In this method, new pipes 2 having a small diameter are sequentially inserted while being joined together.
In addition, since the existing pipe in this pipe-in-pipe construction method is one of the sheath pipes 1, in this specification (including the “claims”), the sheath pipe propulsion method, pipe shown in FIG. Unless otherwise specified, a construction method that promotes and inserts a new pipe 2 into a sheath pipe 1 to form a double pipe structure, such as an in-pipe construction method, is generally referred to as a “sheath pipe construction method”.

  In this sheath pipe propulsion method, the new pipe 2 is usually inserted by installing a hydraulic jack J at the start pit S as shown in FIG. 16, and receiving a reaction force H at the rear of the hydraulic jack J and a pushing angle at the front. B is provided, and the joint 2 is inserted into the receiving port 2b of the forward new pipe 2 inserted into the sheath pipe 1 after the insertion port 2a of the forward new pipe 2 is suspended from the ground on the starting base installed in the starting pit S. The joining is performed by pressing the new pipe 2 backward by the hydraulic jack J while inserting the parts (joining part). With this construction method, there is no problem of blocking traffic, and it is possible to construct a pipeline with the new pipe 2 even if a complicated pipeline is constructed.

  In general, after inserting the new pipe 2 into the entire length of the sheath pipe 1 by the sheath pipe propulsion method, the gap between the sheath pipe 1 and the new pipe 2 is filled with a filler such as mortar from the starting pit S or the reaching pit T. It is. This is because it is necessary to prevent ground subsidence or the like by filling the gap with a filler.

In the double pipe structure constructed in this way, in order to ensure the maximum flow area, it is preferable that the new pipe 2 is closer in diameter to the sheath pipe 1, and preferably one bore diameter rather than the sheath pipe diameter. Only those with a small nominal diameter are adopted.
Further, in recent years, the joint has been required to have earthquake resistance, and the earthquake-resistant pipe joint is generally structured such that the insertion port 2a can be expanded and contracted (removable) in the required range with respect to the receiving port 2b. There are PII type, S type, NS type, SII type and so on.

As shown in FIG. 17, the seismic pipe joint, for example, the PII type joint, is inserted after the rubber ring 3 for sealing is installed inside the receiving port 2b of the one pipe 2 and the lock ring 4 is installed outside. The port 2a is inserted into the receiving groove 2 of the receiving port 2b by expanding the diameter of the lock ring 4 and compressed while the rubber ring 3 is compressed, and the lock ring 4 reaches the annular groove 6 on the outer peripheral surface of the insertion port 2a. The structure is such that a set bolt 7 is screwed into the receiving port 2b from several places around the receiving port 2b to reduce the diameter of the lock ring 4 and fit into the groove 6 (see Patent Document 1). In this joint, the thickness of the receiving port 2b is reduced. Usually, when inserting a new pipe 2 having a nominal diameter smaller than that of the sheath pipe 1 by a single diameter, particularly when inserting into the existing pipe 1, It is used as a joint structure for the new pipe 2.
Japanese Utility Model Publication No. 58-130189

On the other hand, in this sheath tube propulsion method, when the new tube 2 is propelled and inserted into the sheath tube 1, the new tube 2 is generally slid on the inner surface of the sheath tube 1, and the insertion length (starting pit) When the distance between S and the reaching pit T) becomes longer, the frictional resistance at the time of sliding increases, and accordingly, the propulsion device such as the hydraulic cylinder J becomes large.
Further, since the insertion force of the new pipe 2 by the PII type joint is transmitted by the contact between the lock ring 4 on the end face side of the receiving port 2b and the end face of the groove 6, if the insertion force increases, the lock ring 4 is twisted and broken. There is a risk that it will not be promoted smoothly. For this reason, when a large driving force is applied, such as when the distance between the start pit S and the arrival mine T is long, a rib is separately fixed to the outer peripheral surface of the insertion port 2a by welding or the like, and the rib is connected to the receiving port 2b. The propulsive force is transmitted by contacting the end face. The mounting of the rib is complicated.

Furthermore, when the crustal deformation such as an earthquake occurs in the S-type and NS-type earthquake-resistant pipe joints, the insertion port 2a does not come out of the receiving port 2b against the pushing or pulling of the insertion port 2a with respect to the receiving port 2b. It is a structure that responds to its crustal deformation by expanding and contracting (pushing and pulling out) within the range.
In the sheath pipe propulsion method for the earthquake-resistant pipe joint having this structure, when the new pipe 2 is inserted into the sheath pipe 1 buried in the underground W sequentially from one end to the other end, A propulsive force transmission material is provided on the outer peripheral surface of the insertion slot 2a, and the propulsive force transmission material is used to propel the propulsive force by maintaining it in the middle of the required length that can move within a range that does not pass through the insertion slot 2a. When a larger pressing force is applied, the pressing force exceeds the maintaining force of the propulsive force transmission member, and the middle maintenance of the required length that can move within a range that does not pass through the insertion port is released and the insertion port 2a is released. Is further pushed into the receiving port 2b (see Patent Document 2).

One technique for reducing the frictional resistance at the time of inserting the new pipe 2 in the sheath pipe propulsion method is to provide a warp or a wheel on the outer peripheral surface of the new pipe 2 (see Patent Document 2). However, this technique requires a space for providing a warp or the like between the sheath tube 1 and the new tube 2, and usually inserts the new tube 2 having a nominal diameter smaller than the sheath tube 1 by one caliber. It is difficult.
JP 2002-276284 A

Another technique for reducing the frictional resistance at the time of inserting the new tube 2 is to close both ends of the sheath tube 1 and to inject the buoyant material such as water into the sheath tube 1 to buoyant the new tube 2. The new tube 2 is propelled and inserted into the sheath tube 1 (see Patent Documents 3 and 4).
In this technique, since the new tube 2 must be inserted into the sheath tube 1 while maintaining the blockage in the sheath tube 1, the insertion portion is blocked by the expansion / contraction tube around the inner surface of the sheath tube 1. (Patent Document 3), or a flap-shaped seal plate is provided around the inner circumference of the sheath 1 in the axial direction (Patent Document 4), and the tube or seal plate is slidably pressed against the outer surface of the new tube 2 Is going by.
Japanese Patent Laid-Open No. 10-238655 JP 2000-291827 A

First, in a pipe-in-pipe construction method in which a new pipe is inserted into an existing pipe 1 to renew the pipe, the existing pipe 1 has rust and foreign matter attached to its inner surface over the course of several decades. In the above-mentioned sled, etc., the propulsion resistance is large and a large propulsive force is required. In addition, the existing pipe 1 is rarely left with construction drawings, and there are many meandering and branch pipes, etc., and there are steps, gaps, etc. in the joint part. Is a big thing.
For this reason, the pipe-in-pipe method is difficult to predict the propulsive force compared to the sheath tube propulsion method, and in particular, the propulsion method in the earthquake-resistant pipe joint using the propulsive force transmitting material is the seismic tube using the propulsive force transmitting material. It is difficult to secure the gap between the joints (pushing allowance).

Next, in the sheath tube propulsion method using the above buoyancy, as can be understood from FIG. 17, the new pipe 2 such as a PII joint has a bulging portion having a receiving port 2b and a straight pipe portion having an insertion port 2a. The joint portion (joining portion) in which the insertion port 2a is inserted into the receiving port 2b is swelled outward as compared with the straight tube portion.
For this reason, in order to propel and insert the new pipe 2 to be a swelled joint part into the sheath pipe 1 by the techniques described in Patent Documents 3 and 4, the outer circumferences having different diameters of the straight pipe part and the joint part are used. A tube or a seal plate is brought into sliding contact with the surface to close the end surface of the sheath 1.

However, sliding pressure welding with the above tube has only two stages of fluid supply / discharge to the tube (since there are only two ways of fluid injection and release of the fluid pressure), the straight pipe part If the fluid pressure is set so that the blockage of the joint can be ensured, the tube is deformed and allowed to pass through the joint during sliding pressure contact with the joint. Normally, the fluid is liquid and its volume increases or decreases. Is difficult, and a large frictional resistance is generated, leading to breakage of the tube.
For this reason, in this technique, the new pipe 2 is limited to a straight pipe having a substantially straight length. In addition, even when the fluid is gas and the tube expands and contracts, in order to obtain a sufficient pressure contact force, the inside of the tube needs to be at a high pressure. When the joint portion passes, a large frictional resistance is generated, which leads to breakage of the tube.

  In the sliding pressure contact with the seal plate, since the pressure contact force is obtained by the elastic force of the seal plate, the pressure contact force cannot be sufficiently obtained, and the buoyancy material is likely to leak. Also, at the time of sliding contact with the joint, the seal plate is deformed and the passage of the joint is allowed. Normally, deformation (deflection) of the seal plate is difficult to make uniform. In the meantime, uniform sliding pressure welding is not performed, and buoyancy material often leaks from insufficient pressure welding points.

Moreover, the water stop (clogging) of the sheath pipe 1 on the side of the reaching mine T is sealed by attaching a lid, or a buoyancy is adjusted by providing a tank. On the other hand, when a ductile cast iron pipe or the like is inserted into the sheath pipe 1 as the new pipe 2, it is necessary to project the new pipe 2 into the arrival pit T of a predetermined length on the arrival mine T side as described later.
At this time, with the sealed lid, it is necessary to remove the lid after all the buoyant material in the sheath 1 has been discharged, which takes time (and takes time). Further, after the buoyant material is discharged, the new tube has a predetermined length. It will be troublesome because it will be projected to the reaching pit T. In addition, if a tank for adjusting buoyancy is provided, the facility becomes large, and the amount of buoyancy material necessary for giving buoyancy to the new pipe 2 is also necessary for the buoyancy adjustment. Then, enormous expense is required for processing of the buoyancy material.

  Further, conventionally, the buoyancy material in the sheath tube 1 is closed by covering the tip of the newest tube 2 with a cap, and the tip of the new tube 2 is inserted into the start shaft S side end of the sheath 1. Alternatively, the gap between the new tube 2 and the sheath tube 1 is closed by a sealing plate, and then the injection is performed. However, there is a case where it is desired to inject the buoyancy material into the sheath tube 1 before inserting the tip of the new tube 2 into the start shaft S side end of the sheath tube 1 in the work procedure.

  In addition, after the new tube 2 has been propelled and inserted into the entire length of the sheath tube 1, it is necessary to center the new tube (pipe), which is conventionally performed after discharging the buoyancy material. It is done with tools. The work is complicated. In addition, the dedicated jig is expensive.

  Further, conventionally, filling (filling) of the filler into the gap (gap) between the sheath 1 and the new tube 2 is performed by discharging the buoyant material from the sheath 1 and then injecting the filler into the sheath 1. Is done by doing.

  In this invention, when a buoyancy is applied to a new pipe for propulsion insertion, the buoyancy material is surely leaked even if the joint of the new pipe swells (such that there is a difference in the outer diameter of the pipe). The second problem is to make it possible to inject the buoyant material into the sheath pipe before inserting the tip of the new pipe into the start pit side end of the sheath pipe. The third problem is to facilitate new blockage after reaching the new pipe at the end of the mine side, and further smoothing out the predetermined length of the new pipe after reaching the new pipe at the end of the pit side of the pipe. The fourth problem, the fifth problem is to facilitate the centering of the new pipe after the new pipe is propelled and inserted into the entire length of the sheath pipe, and the sixth problem is to facilitate the filling operation of the filler. A seventh problem is to easily perform the propulsion in the earthquake-resistant pipe joint using the problem and the propulsive force transmitting material.

In order to achieve the first object, one means of the present invention is to adjust the degree of expansion of the tube by the supply amount or supply pressure of the fluid to the expansion / contraction tube of Patent Document 3, and the tube is a new tube. This is to cope with a change in the diameter of the outer peripheral surface.
Thus, if the degree of expansion of the tube due to the fluid supply amount or supply pressure is adjusted in response to the diameter change of the outer peripheral surface of the new pipe, for example, in the case of a straight pipe portion, the supply amount and the like are increased, When moving from the straight pipe part to the joint part, reduce the supply amount etc. according to the change in diameter as the transition occurs (discharge the fluid) to obtain an appropriate pressure contact force. When the tube is transferred to the tube, the opposite action is performed to adjust the expansion of the tube, so that even if there is a change in the diameter of the outer surface of the new tube, an appropriate pressure contact force can be obtained. it can.
At this time, a known fluid such as air or water can be adopted as the fluid (hereinafter the same), and the number of tubes is arbitrary (hereinafter the same). Further, both the fluid supply amount and the supply pressure can be adjusted, and the “adjustment of the fluid supply amount or supply pressure” of this means may be performed by adjusting at least one of them, including the case of adjusting both ( same as below).

Another means is that the expansion / contraction tube of Patent Document 3 is provided on the sheath tube, and the expansion / contraction tube is provided on the front side or the rear side, and further on the sheath tube in the axial direction of the sheath tube. An elastic tube is provided between the expansion and contraction tubes, and the elastic tube is set to have an inner diameter that is in pressure contact with the outer peripheral surface of the bulge receiving portion of the new pipe and that does not contact the outer peripheral surface of the straight pipe portion of the new pipe. Because leakage of buoyant material is prevented by contact and separation of the new tube to the outer peripheral surface of the straight tube portion and pressure contact to the outer peripheral surface of the bulging receiving port portion of the elastic tube by supplying and discharging fluid to and from the expansion and contraction tube is there.
At this time, the expansion / contraction tube may be one that can adjust the degree of expansion of the tube according to the amount of fluid supplied, or one that has only two stages of fluid supply / discharge. Further, the number of front and rear expansion / contraction tubes and elastic tubes is arbitrary (hereinafter the same).

  In this means, for example, a joining portion (joint portion) of a new pipe is inserted into the receiving port, and the receiving port bulges from the straight tube portion having the insertion port with a larger diameter. If the elastic tube and the expansion / contraction tube are provided on the entire inner circumference of the sheath tube with the expansion / contraction tube on the front side in the insertion direction of the new tube and separated in the axial direction of the sheath tube, the sheath tube At the time of insertion into one end, the expansion / contraction tube is expanded and slid into pressure contact with the outer peripheral surface of the straight tube portion. At this time, leakage of the buoyancy material is prevented by the pressure-contact sliding to the outer peripheral surface of the straight tube portion of the expansion / contraction tube.

  Next, when inserting the joint portion into the sheath end, insert the front portion of the joint portion into the elastic tube with the expansion and contraction tube inflated and pressed against the outer peripheral surface of the straight tube portion. After being brought into pressure contact with the outer peripheral surface of the bulging receptacle portion, the fluid in the bulging / contracting tube is discharged, and the joint portion is inserted and slid into the elastic tube. At this time, leakage of the buoyancy material is initially prevented by pressure-contact sliding on the outer peripheral surface of the straight tube portion of the expansion / contraction tube, and the elastic tube is pressed against the outer peripheral surface of the joint portion (outer peripheral surface of the bulge receiving portion). For example, it is prevented by the pressure contact. For this reason, the fluid in the expansion / contraction tube can be discharged thereafter.

  Further, when the expansion / contraction tube reaches the rear portion of the joint portion, while supplying fluid to the expansion / contraction tube, the joint portion is further inserted, and the expansion / contraction tube is eventually brought into pressure contact with the outer peripheral surface of the straight tube portion, thereby An aspect in which the joining portion exceeds the tube and the expansion / contraction tube is employed. At this time, leakage of the buoyancy material is initially prevented by the pressure-contact sliding on the outer peripheral surface of the joining portion of the elastic tube, and is eventually prevented by the pressure-contacting on the outer peripheral surface of the straight tube portion of the expansion / contraction tube.

  In addition, in the case where the elastic tube and the expansion / contraction tube are provided around the inner periphery of the sheath tube with the expansion / contraction tube rearward in the insertion direction of the new tube and separated in the axial direction of the sheath tube, Similarly, when inserting into one end of the sheath tube, the buoyant material is prevented from leaking due to the pressure-contact sliding on the outer peripheral surface of the straight tube portion of the expansion / contraction tube, and when inserting into the sheath end of the sheath tube Then, while discharging the fluid from the state where the expansion / contraction tube is expanded and pressed against the outer peripheral surface of the straight pipe portion, the front portion of the joint portion is inserted into the elastic tube and pressed against the outer peripheral surface of the bulge receiving portion. . At this time, leakage of the buoyancy material is initially prevented by pressure-contact sliding on the outer peripheral surface of the straight tube portion of the expansion / contraction tube, and the elastic tube is pressed against the outer peripheral surface of the joint portion (outer peripheral surface of the bulge receiving portion). For example, it is prevented by the pressure contact.

  Next, when the joint portion is further inserted and the rear portion reaches the expansion / contraction tube, the fluid is supplied to the expansion / contraction tube and pressed against the outer peripheral surface of the straight pipe portion, and the joint portion is further inserted, Eventually, the spliced portion will extend beyond the elastic tube and the expansion / contraction tube. At this time, leakage of the buoyancy material is initially prevented by the pressure-contact sliding on the outer peripheral surface of the joining portion of the elastic tube, and is eventually prevented by the pressure-contacting on the outer peripheral surface of the straight tube portion of the expansion / contraction tube.

  Furthermore, in the case where an expansion / contraction tube is provided in the front and back, separated in the axial direction of the sheath tube, and an elastic tube is provided between the both expansion / contraction tubes, when inserting the straight tube portion into one end of the sheath tube Similarly, leakage of the buoyancy material is prevented by the pressure contact sliding of the both expansion / contraction tubes to the straight pipe portion outer peripheral surface. At this time, both expansion / contraction tubes may be expanded or only one of them may be expanded.

  Next, at the time of insertion into the sheath of one end of the sheath tube, in the state where both the expansion and contraction tubes are inflated and pressed against the outer peripheral surface of the straight tube portion, the fluid of the rear expansion and contraction tube is discharged, The front portion of the joint portion is inserted and slid into the expansion / contraction tube on the rear side, and then inserted and slid into the elastic tube. At this time, leakage of the buoyancy material is initially prevented by pressure sliding against the outer peripheral surface of the straight tube portion of the front expansion / contraction tube, and if the elastic tube is in pressure contact with the outer peripheral surface of the joint portion, the pressure contact prevents it. The Therefore, thereafter, the fluid in the front expansion / contraction tube can be discharged.

  Further, when the front portion of the joint portion reaches the front expansion / contraction tube, the fluid of the front expansion / contraction tube is discharged or discharged in advance, and the joint portion is placed inside the front expansion / contraction tube and the elastic tube. When the rear expansion / contraction tube exceeds the spliced portion, fluid is supplied to the rear expansion / contraction tube to expand it and press it against the outer peripheral surface of the straight tube portion. It is set as the aspect etc. in which a joining part exceeds a front side expansion-contraction tube. At this time, the leakage of the buoyancy material is initially prevented by the sliding contact with the outer peripheral surface of the joint portion of the elastic tube, and is eventually prevented by the press contact with the outer peripheral surface of the straight tube portion of the rear expansion / contraction tube.

In order to achieve the second problem, the present invention is configured such that a cap is fitted to the inner surface of one end of the sheath tube via the expansion / contraction tube, one end is closed, and the tip of the earliest new tube is fitted to the cap. The new tube was inserted into the sheath tube with the cap.
In this way, since one end of the sheath tube is closed with the cap fitted to the sheath tube, the buoyancy material can be injected into the sheath tube before the new tube is inserted into the sheath tube. At this time, the number of expansion / contraction tubes is arbitrary (hereinafter the same).

In order to achieve the third object, the present invention is configured such that the tip of the newest tube that has been inserted is fitted into a jig at the other end of the sheath tube, and the fitting of the other end of the sheath tube is performed. It was designed to occlude.
In this way, instead of the lid that had closed the other end of the sheath (preventing leakage of the buoyant material) as well as reaching the other end of the sheath at the end of the new tube, When the tip of the new pipe is fitted to the jig, the sheath is closed at the other end. For this reason, buoyancy material does not leak even if the lid that has been closed up to now is removed. If the new pipe is further pulled out with the lid removed and the leakage prevention is maintained, The new tube can be projected at a predetermined length at the end, and the fourth problem can be achieved.

  At this time, if the center of the new tube is fitted by fitting the tip of the new tube into the jig, the new tube can be centered as soon as the sheath reaches the other end of the tube. That is, the fifth problem can be achieved.

In order to achieve the sixth problem, the present invention employs a buoyancy material that is cured after all of the new pipe is inserted into the sheath pipe.
In this way, since the buoyancy material becomes the filler, the buoyancy material discharge operation, the accompanying discharge buoyancy material treatment operation (water treatment operation) and the separate injection of the filler material are eliminated, leading to cost reduction. .

In order to achieve the seventh problem, the present invention reduces the frictional resistance between the new pipe and the existing pipe inner surface as much as possible by adjusting the supply / discharge amount of the buoyancy material (sheath buoyancy material level adjustment in the pipe). It was.
The degree of reduction is preferably such that the new pipe and the inner surface of the existing pipe are not in contact with each other, but considering the complexity of the buoyancy material supply / discharge operation, it is not always necessary to make the contact non-contact. It is optional as long as it is obtained. For example, if propulsion is possible even if sliding, the degree of reduction is sufficient. If buoyancy acts on the new pipe, the frictional resistance will be reduced.
In this way, if the frictional resistance is reduced, it becomes easier to adopt a pipe-in-pipe method such as a pipe-in-pipe method for earthquake-resistant pipe joints using transmission materials. Therefore, it becomes easy to secure the space (push allowance) of the seismic pipe joint with the thrust transmission material.

As described above, the present invention smoothly prevents leakage of a buoyancy material even in a new pipe having a change in outer peripheral surface diameter by adjusting the supply of fluid to the expansion / contraction tube or by combining the expansion / contraction tube and the elastic tube. be able to.
In addition, by adopting a new tube tip closing cap, buoyancy material can be injected into the tube at an early stage or easily centered. Furthermore, the sheath at the other end of the new tube can be smoothly closed by fitting the sheath at the tip of the new tube into the jig at the other end of the tube.
Furthermore, the use of a buoyant material that also serves as a filler can reduce the construction time, and the pipeline can be constructed efficiently and economically. That is, the work cost can be reduced.
In addition, the propulsion insertion of a new pipe into an existing pipe by a buoyancy material makes it easy to predict the propulsion force, and a pipe-in-pipe method or the like in an earthquake-resistant pipe joint using a propulsion force transmission material becomes possible.

  As an embodiment of the invention related to the sheath pipe propulsion method for achieving the first problem, the sheath pipe buried in the ground, for example, from one end to the other end (arrival mine side) on the start shaft side is directed. When inserting new pipes one after another, the ends of the sheath pipe are closed, and a buoyant material is injected into the sheath pipe to give buoyancy to the new pipe, thereby reducing the friction between the new pipe and the sheath pipe. In the reduced sheath tube propulsion method, the sheath on one end side of the sheath tube is provided with a tube that expands and contracts around the inner surface of the sheath tube by supplying and discharging fluid, and the amount of fluid supplied to the tube or the supply pressure of the tube It is possible to adopt a configuration in which the degree of expansion is adjusted so that the tube corresponds to a change in the diameter of the outer peripheral surface of the new tube.

  In addition, as another embodiment of the invention relating to the sheath tube propulsion method that achieves the first problem, similarly, a sheath is buried in the ground, and a new tube is joined sequentially from one end to the other end. When inserting, the both ends of the sheath tube is closed, a buoyant material is injected into the sheath tube to give buoyancy to the new tube, and in the sheath tube propulsion method that reduces friction between the new tube and sheath tube, First, the joint part of the new pipe is a part in which the insertion port is inserted into the reception port, and the reception port bulges out from the straight tube part having the insertion port. The clogging on the one end side consists of an elastic tube and a tube that expands and contracts by the supply and discharge of fluid on the entire inner circumference of the sheath tube, the elastic tube is the front side or the rear side of the new tube insertion direction, and the expansion and contraction tube is the front and rear in the sheath axis direction In the case of an elastic tube, there is an elastic tube between the expansion and contraction tubes. The expansion and contraction tube and the elastic tube are pressed against the outer peripheral surface of the new tube, and the elastic tube is pressed against the outer peripheral surface of the bulge receiving port of the new tube and the outer periphery of the straight tube portion of the new tube The inner diameter is not in contact with the surface, and when the sheath of the straight pipe portion is inserted into one end of the pipe, the expansion / contraction tube is expanded and slidably pressed against the outer peripheral surface of the straight pipe portion.

  Next, in the case where the expansion / contraction tube is provided on the front side in the insertion direction of the new pipe from the elastic tube, the expansion / contraction tube is expanded at the time of insertion into the sheath end of the joint, and the straight pipe portion Insert the front part of the spliced part into the elastic tube and press it to the outer peripheral surface of the bulging receiving part in a state where it is pressed against the outer peripheral surface, and then discharge the fluid from the expansion / contraction tube, and further splicing When the expansion / contraction tube reaches the rear part of the joint portion, the joint portion is inserted while supplying fluid to the expansion / contraction tube. It is set as the structure which is made to press-contact to an outer peripheral surface of a part, and a joining part exceeds an elastic tube and an expansion / contraction tube.

  Further, in the case where the expansion / contraction tube is provided behind the elastic tube in the insertion direction of the new tube, the expansion / contraction tube is expanded when the sheath portion is inserted into one end of the tube. While discharging the fluid from the state of being in pressure contact with the outer peripheral surface, the front part of the joint portion is inserted and slid into the expansion / contraction tube and then inserted into the elastic tube, and the elastic tube is inserted into the outer periphery of the bulge receiving portion. When the back part reaches the expansion / contraction tube, the fluid is supplied to the expansion / contraction tube and pressed to the outer peripheral surface of the straight pipe part. Eventually, the joining portion exceeds the elastic tube and the expansion / contraction tube.

  Furthermore, in the case where the expansion / contraction tubes are provided in the front and rear in the sheath axial direction, when inserting the joint portion, both the expansion / contraction tubes are inflated and pressed against the outer peripheral surface of the straight pipe portion, While discharging the fluid of the expansion / contraction tube, the front part of the joint is inserted and slid into the expansion / contraction tube on the rear side, and finally inserted and slid into the elastic tube. When the tube is reached, the fluid of the front expansion / contraction tube is discharged, and the joint portion is further inserted and slid into the front expansion / contraction tube and the elastic tube so that the rear expansion / contraction tube exceeds the joint portion. At that time, a fluid is supplied to the rear expansion / contraction tube to expand the pressure tube and press-contact with the outer peripheral surface of the straight tube portion. Thereafter, the joining portion exceeds the elastic tube and the front expansion / contraction tube.

  The elastic tube may be solid or hollow, and in the case of the hollow elastic tube, the fluid may be sealed even if the fluid is sealed in the hollow.

  In these sheath tube propulsion methods, a cap is fitted on the inner surface of one end of the sheath tube via the expansion / contraction tube, one end is closed, the tip of the earliest new tube is fitted to the cap, and the new tube is capped. If it is inserted into the sheath tube together with this, it can be an embodiment of the invention that achieves the second problem.

  Further, by adjusting the liquid level of the buoyancy material, the frictional resistance between the new pipe and the existing pipe inner surface can be reduced as much as possible. As described above, this reduction degree is not necessarily required to make the new pipe and the existing pipe inner surface non-contact, and is optional as long as the new pipe can be promoted.

  As an embodiment of the invention related to the sheath tube propulsion method that achieves the third problem, when inserting a new tube sequentially from one end to the other end in the sheath tube buried in the ground, In the sheath propulsion method in which both ends of the sheath tube 2 are closed and a buoyant material is injected into the sheath tube to give buoyancy to the new tube, and the friction between the new tube and the sheath tube is reduced. A configuration is adopted in which the end of the newest tube is fitted at the end and a jig for closing the other end of the sheath is provided.

At this time, the jig includes, for example, a cylindrical body that is coaxially fitted to the other end of the sheath and a lid that closes the opening of the cylindrical body. If the lid is removed after fitting through the packing, the other end of the sheath pipe is closed through the packing by fitting the tip of the earliest new pipe into this jig. Even if the cover is removed, the buoyancy material does not flow out of the sheath tube, and the new tube can be pulled out from the sheath tube by a predetermined length on the arrival shaft side. The fact that the required length can be drawn facilitates the joining of the rising pipe side and the new pipe of the preceding work section on the pit side. Thereby, it can be set as embodiment which achieves the said 4th subject.
Further, if the tip of the new pipe is fitted to a jig to close the other end of the sheath pipe and perform centering, an embodiment that achieves the fifth problem can be obtained.

  The configuration in which the tip of the earliest new pipe is fitted and a jig for closing the other end of the sheath is provided for each embodiment that achieves the first problem.

  If the tip of the new tube is covered with a cap to close the tip of the new tube, and the cap fits into the jig, the other end of the sheath 1 can be closed. It can be made easy to fit as a conical shape into which the cap fits. At this time, the cap can also be formed in a cone shape whose diameter is reduced toward the other end of the sheath.

  As an embodiment of the invention related to the sheath tube propulsion method for achieving the sixth problem, when inserting a new tube sequentially into one of the sheath tubes buried in the ground from one end to the other end, the sheath In the sheath tube propulsion method in which both ends of the tube are closed, buoyancy material is injected into the sheath tube to give buoyancy to the new tube, and friction between the new tube and sheath tube is reduced, the buoyancy material is A structure that becomes a filler between the sheath tube and the new tube can be adopted as all of the new tube is cured after being inserted into the sheath tube.

In addition, as an embodiment of the invention relating to the closed structure on one end side of the sheath pipe that achieves the first problem, the new pipe is sequentially joined from the one end to the other end in the sheath pipe embedded in the ground. When inserting, the both ends of the sheath tube are closed, a buoyant material is injected into the sheath tube to give buoyancy to the new tube, and the friction between the new tube and sheath tube is reduced in the sheath propulsion method. In the closed structure on the one end side of the sheath tube, a tube that expands and contracts by supplying and discharging fluid is provided on the entire inner surface of the sheath tube, and the degree of expansion of the tube is adjusted by the supply amount of the fluid, and the tube A configuration in which the sheath is closed at one end in response to a change in the diameter of the outer peripheral surface can be employed.
If it is this structure, the effect | action same as the effect | action of one Embodiment which concerns on the sheath pipe construction method which achieves the said 1st subject can be performed.

In this configuration, an elastic tube is further provided on the entire inner circumference of the sheath on the front side or the rear side of the expansion / contraction tube, and the elastic tube is in pressure contact with the outer peripheral surface of the receiving portion of the new pipe and is also connected to the outer periphery of the straight pipe portion of the new pipe. It can be set as the structure made into the internal diameter which does not contact | connect a surface.
With this configuration, when the straight pipe portion is inserted, the expansion / contraction tube is expanded and slidably pressed against the outer peripheral surface of the straight pipe portion. When the joining portion is inserted, the expansion / contraction tube is on the front side. In this case, if the expansion / contraction tube is inflated and pressed against the outer peripheral surface of the straight tube portion, the joint portion is inserted and slid into the elastic tube, and the front portion of the joint portion reaches the front expansion / contraction tube. While discharging the fluid of the front tube, the joint portion is further inserted and slid into the elastic tube, and when the front expansion / contraction tube exceeds the joint portion, the fluid is gradually supplied to the front expansion / contraction tube. Then, it is inflated and brought into pressure contact with the outer peripheral surface of the straight pipe portion, so that the joining portion exceeds both tubes.
When the expansion / contraction tube is on the rear side, when inserting the splicing part, the front part of the splicing part is inserted and slid into the rear expansion / contraction tube while discharging the fluid of the expansion / contraction tube. After that, if it is inserted and slid into the elastic tube, and the joint part exceeds the rear expansion / contraction tube, a fluid is supplied to the expansion / contraction tube to expand it and press it against the outer peripheral surface of the straight pipe part. Exceeds both tubes.

Furthermore, if the expansion / contraction tube is provided on both sides of the elastic tube, the same action as that of the other embodiment of the invention relating to the sheath propulsion method for achieving the first problem can be achieved. it can. At this time, the expansion and contraction tubes need not be made to be able to adjust the degree of expansion according to the amount of fluid supplied and to cope with the change in the diameter of the outer peripheral surface of the new pipe. The supply and discharge of the fluid, which is only the discharge action away from the pressure supply and the pressure contact, may be only two stages of on and off.
In addition, if the expansion / contraction tube can adjust the degree of expansion according to the fluid supply amount, it can cope with a change in the nominal diameter of the new tube.

As a means for attaching the expansion / contraction tube and the elastic tube to the inner surface of the sheath tube, it can be directly attached to the sheath tube, but it can be provided on the inner surface of the cylindrical body fitted to one end of the sheath tube.
In this way, simply by fitting the tubular body having the expansion / contraction tube and the elastic tube to the sheath tube, the expansion / contraction tube and the elastic tube can be attached to the sheath inner surface. The cost can be reduced, for example, the cylindrical body can be replaced with another sheath pipe.
In this case, the cylindrical body can be provided with a supply / discharge valve for the buoyant material in the sheath.

In addition, as an embodiment of the closure structure on the other end side of the sheath pipe in the sheath pipe propulsion method shown in each of the above embodiments, a jig for closing the other end of the sheath pipe by fitting the tip of the newest new pipe The jig is composed of a cylindrical body that is coaxially fitted to the other end of the sheath pipe, and a lid that closes the opening of the cylindrical body. A configuration in which a packing is provided and the tip of the earliest new tube is fitted into the cylindrical body through the packing can be employed.
In this configuration, the other end of the sheath tube is closed through the packing by fitting the tip of the earliest new tube into the jig, so that the buoyancy material flows out from the sheath tube even if the lid is removed. In addition, the new pipe can be pulled out from the sheath pipe by a predetermined length on the arrival shaft side.

  Note that water is generally used as the buoyancy material, and the amount of injection is arbitrary as long as friction with the sheath of the new tube can be reduced.

  As an embodiment of the invention related to the sheath pipe propulsion method based on the seventh problem, when inserting a new pipe sequentially from one end to the other end in an existing pipe buried in the ground, the joint The section is provided with a propulsive force transmitting material on the outer peripheral surface of the insertion slot of the new pipe, and this propulsive force transmitting material is used for propulsion while maintaining the middle of the required length that can move within the range that does not pass through the insertion slot. Therefore, when a pressing force larger than the propulsive force is applied, the pressing force exceeds the maintaining force of the propulsive force transmitting material, and the middle maintenance of the required length that can move within the range that does not pass through the insertion opening is released. A telescopic earthquake-resistant joint structure in which the insertion port is further pushed into the receiving port, both ends of the existing pipe are closed, and a buoyant material is injected into the existing pipe to give buoyancy to the new pipe. , Adopting a configuration with reduced friction between the new pipe and existing pipe It can be.

FIG. 1 to FIG. 8 show an embodiment. This embodiment relates to the renewal of the existing pipe 1, and as shown in FIG. 1, the start pit S and the arrival pit T are formed at a required interval. A water stop mechanism 10 is attached to the end (one end) of the start pit S of the existing pipe (sheath pipe) 1 between them and closed, and a water stop / centering jig is provided at the end of the arrival mine T (the other end). 20 is attached and closed.
The starting mine S and the reaching mine T may be formed at the same place as when the existing pipe 1 is buried, but are arbitrary as long as the side part of the road can be formed. A conical cap 30 is fitted and closed at the leading end of the new pipe 2 inserted into the sheath pipe 1 so that the buoyancy material a does not flow into the new pipe 2.

As shown in FIG. 4, the joining portion (joint portion) of the new pipe 2 is formed with axial grooves 6a and 6b on the outer peripheral surface of the insertion port 2a and the inner peripheral surface of the receiving port 2b, respectively. The lock rings 4a and 4b are respectively fitted to 6b, and the state shown in the figure is normal (when new pipe laying is completed). In this state, after inserting the insertion port 2a of the rear new tube 2 into the receiving port 2b of the future new tube 2, (or before inserting), the propulsive force transmitting material is placed on the outer peripheral surface of the insertion port 2a outside the receiving port 2b. 8, and the propulsive force transmission member 8 is fixed by a flange (saddle ring) 9 that is fixed to the outer peripheral surface of the opening 2 a by welding or the like (see Patent Document 2). The material and configuration of the propulsive force transmission member 8 and the configuration of the flange 9 are not limited to those shown in the figure, and are arbitrary. For example, a resin foam such as polyurethane or polystyrene having a compressive stress of 1 to 30 kgf / cm ² (≈0.1 to 3 MPa) is employed for the propulsive force transmission member 8.

When the new pipe 2 is sequentially pushed and inserted into the sheath pipe 1 from one end to the other end in the sheath pipe 1, the joining portion is pushed by the propulsive force transmitting material 8 and the inner end of the insertion opening 2 a and the inner surface of the receiving opening 2 b. While maintaining the gap with the back end surface 2b ′ (maintaining the state of FIG. 4), the propulsive force is transmitted from the backward new pipe 2 to the forward new pipe 2, and the new pipe 2 is propelled. The pipe of the new pipe 2 is laid along the entire length of the sheath pipe 1.
For the promotion, various means such as the means shown in FIG. 16, the means described in Patent Document 5, and the means described in Japanese Patent Application No. 2004-213203 are adopted.
Japanese Patent Laid-Open No. 2004-238851

  In the new pipeline after laying, the propulsive force transmission member 8 contracts or collapses against a large compressive force such as an earthquake, and the tip of the insertion port 2a abuts or is inserted into the inner end 2b ′ of the inner surface of the receiving port 2b. Until the mouth side lock ring 4a comes into contact with the rear end face side 6a 'of the insertion side groove 6a, the insertion of the insertion port 2a with respect to the receiving port 2b is allowed, and both lock rings 4a, Until the 4b comes into contact with the front end surface of the insertion slot side groove 6a, the insertion slot 2a is allowed to be pulled out from the receiving slot 2b. In other words, the splicing portion has an earthquake resistance function that allows insertion / extraction of the insertion port 2a (see Patent Document 2).

  As shown in FIG. 4, the water stopping mechanism 10 for the sheath pipe 1 on the start pit S side requires expansion / contraction tubes 12a and 12b in the axial direction on the inner surface of a cylindrical tube 11 with a flange 11a made of ductile or steel. They are provided at intervals, and a solid rubber ring (tube) 13 is provided between them. The cylindrical tube 11 has its flange 11a attached to the sheath tube 1 on its end surface by bolting or welding. The tubes 12a, 12b, and 13 are fixed by bonding or screwing.

  A hose 14 connected to an air compressor, an air pump, or the like is connected to both the expansion / contraction tubes 12a and 12b with holes formed in the sheath tube 1, and a three-way valve (not shown) of each hose 14 is connected. As a result of this, air (fluid) b is selectively injected into the both expansion / contraction tubes 12a, 12b, and each expansion / contraction tube 12a, 12b expands to a required pressure, or both expansion / contraction tubes 12a, 12b are selective. And the expansion / contraction tubes 12a and 12b contract. At this time, it is preferable that the inflow amount (inflow pressure) of the fluid b into the expansion / contraction tubes 12a and 12b is automatically controlled so as to have an appropriate value corresponding to the external pressure received by sliding with the new tube 2.

  When the expansion / contraction tubes 12a, 12b expand to the required pressure, the expansion / contraction tubes 12a, 12b come into pressure contact with the outer peripheral surface of the straight tube portion (insertion port 2a portion) of the new tube 2 to cause leakage of a buoyancy material a described later. This allows the straight pipe to slide. At this time, the material of the expansion / contraction tubes 12a and 12b and the fluid b pressure are appropriately set so as to allow the sliding and prevent leakage while preventing the sliding and damaging itself.

  The inner diameter of the rubber ring 13 is set to be larger than the outer diameter of the straight pipe portion of the new pipe 2 and slightly smaller than the outer diameter of the receiving port 2 b, and the outer peripheral surface of the receiving port 2 b is formed on the inner surface of the rubber ring 13. The contact 2b is allowed to slide while preventing leakage of the buoyancy material a. At this time, the material and the diameter of the rubber ring 13 are appropriately set so as to allow the sliding and prevent leakage while preventing the rubber ring 13 from rubbing and being damaged.

  The diameter and number of the rubber rings 13 are determined so that the parallel length is equal to or greater than the length of the tapered portion from the straight tube portion to the receiving portion. For example, since the diameter of the rubber ring 13 is determined by the difference between the inner diameter of the sheath tube 1 and the outer diameter of the receiving portion 2b of the new tube 2, the cross-sectional diameter is larger than the difference and as shown in FIG. In addition, when the required number of rubber rings 13 are arranged so as to contact each other in the axial direction of the sheath tube 1, the rubber ring 13 provided closest to the start shaft S side from the center of the cross section in the expanded state of the front expansion / contraction tube 12a. The diameter and the number of arrangement of the rubber ring 13 are determined so that the sheath L at the center of the cross section is equal to or longer than the length t of the tapered portion extending from the straight portion to the receiving portion. Thus, as will be described later, before the fluid b sealed in the front expansion / contraction tube 12a is removed, the rubber ring 13 is pressed against the outer peripheral surface (maximum diameter outer peripheral surface) of the receiving port 2b to ensure water stoppage. To be made.

In addition, the cross-sectional shape of each expansion / contraction tube 12a, 12b and the rubber ring 13 is not limited to a circle, and may be any shape such as an ellipse or a polygon as long as it can be slid by pressure. If a lubricant is applied to the surfaces of the expansion / contraction tubes 12a and 12b and the rubber ring 13, the frictional resistance when the new tube 2 is inserted can be reduced.
Further, the supply / discharge fluid b to the expansion / contraction tubes 12a, 12b may be water or the like in addition to air. In the case of water, if the water tank is installed on the ground and the pressure in the expansion / contraction tubes 12a, 12b is kept constant due to the difference in water head, the expansion / contraction tubes 12a, 12b will pass even if the receiving port 2b passes. The surface pressure with the receiving port 2b becomes constant, and the pressure load and air venting (supply / discharge) steps are not required as in the case of air. In the case of air, an accumulator mechanism that provides a constant pressure may be applied.

  The other end closing and centering jig 20 of the sheath tube 1 has a shape (reducer shape) that changes from a cylindrical portion 22 fitted to the outer peripheral surface of the tip portion of the sheath tube 1 to a truncated cone portion 23 and further to a cylindrical portion 24. The flanged water-stopping lid 21 is screwed to the cylindrical portion 24 at the tip thereof and is closed. A rubber ring (packing) 25 is provided on the inner surface of the cylindrical end portion 24 of the jig 20. When the insertion opening 2 a (cap 30) of the earliest new tube 2 enters the cylindrical portion 24, Sealing (liquid-tight) by the rubber ring 25 prevents the buoyancy material a from leaking. For this reason, even if the water stop lid 21 is removed, the buoyancy material a does not flow out from the sheath tube 1, and the new tube 2 can be pulled out from the sheath tube 1 by a predetermined length on the arrival tunnel T side.

  For example, as shown in FIG. 2, the cap 30 is fixed to the insertion opening 2 a of the new tube 2 by providing a circumferential groove 32 on the rear outer peripheral surface of the cap cylindrical portion 31. After being inserted into the tubular portion 31, the rear portion of the tubular portion 31 is supported so as to protrude from the end surface of the sheath tube 1 to the start shaft S side, and after inserting the new tube insertion port 2 a into the tubular portion 31 from the support state, A band 33 made of steel or the like is fitted into the groove 32 and tightened. However, the fixing of the cap 30 and the insertion opening 2a is not limited to that shown in the drawing as long as it can exhibit a water stop function and does not come off the leading new tube 2 during the subsequent insertion of the new tube 2.

  This embodiment is configured as described above. Next, its operation will be described. First, as shown in FIG. 1, the start pit S and the arrival pit T are formed at a required interval in the buried path of the existing pipe 1. In the start pit S, as shown in FIG. 5 (a), the expansion / contraction tubes 12a and 12b and the cylindrical tube 11 with the rubber ring 13 are fitted to the start pit S side (one end) of the sheath tube 1 to fix the screws. And the cap 30 is fitted into the cylindrical tube 11. At this time, the air b may be supplied into the expansion / contraction tubes 12 a and 12 b or may be supplied after the cap 30 is fitted. On the other hand, a jig 20 with a water stop lid 21 is attached to the end of the sheath pipe 1 on the T side (the other end) via a sealing material 26 to close both ends of the sheath pipe 1 (the inside of the sheath pipe 1 is liquid-filled). Dense).

  Next, the buoyancy material a is filled into the sheath tube 1 from the filling port 40 at an appropriate location (see FIG. 1). The buoyancy material a is a filler using a post-curing friction reducing material (for example, product name: AHL manufactured by Yakuhin Development Center Co., Ltd.) that cures after inserting all of the new tube 2 into the sheath tube 1. The filling amount (injection amount) may be the entire cross-section in the sheath 1 as shown in the figure, but it is sufficient that buoyancy is given to the new tube 2 and friction with the inner surface of the sheath 1 does not occur. You are free as long as you meet it.

  After the filling of the buoyant material a is completed or before the filling, the cap 30 in which the insertion port 2a of the earliest new pipe 2 is fitted to the sheath pipe 1 as shown in FIGS. Fit into the cylindrical portion 31. Next, if the buoyancy material a is filled, the new tube 2 is further pushed in as shown in FIG. 5C, and if it is not filled, the buoyancy material a is pushed in similarly. Since the pushing and insertion of the new pipe 2 by this pushing is performed in the buoyancy material a, the buoyancy is received by buoyancy from the buoyancy material a and the outer peripheral surface of the straight pipe portion is slidably pressed against both the expansion / contraction tubes 12a and 12b. While preventing leakage of the material a, it advances through the sheath 1 with low friction.

At this time, the liquid level of the buoyancy material a in the sheath 1 rises due to the loading (progress) of the new pipe 2, but the buoyancy material a is discharged from the air vent hole 41 or the discharge hole 45, and the liquid level is at a certain level. Maintained.
Even if the new pipe 2 slides on the inner surface of the sheath 1, for example, the axial center of the new tube 2 is slightly below the shaft center of the sheath 1, the new pipe 2 can be propelled. Like that.

The insertion port 2a of the succeeding new tube 2 is inserted and connected to the receiving port 2b of the earliest new tube 2, and the new tube 2 is further inserted. As shown in FIG. When the (receiving port 2b part) approaches the rear expansion / contraction tube 12b, the air b in the expansion tube 12b is exhausted by the three-way valve of the hose 14 as shown in (b) to (c). On the other hand, the receiving port 2b is inserted and slid into the expansion / contraction tube 12b, and then inserted and slid into the rubber ring 13. When the rubber ring 13 reaches the outer peripheral surface of the receiving port 2b, the rubber ring 13 is pressed against the receiving port 2b to prevent leakage of the buoyancy material a ((c) in the figure).
As long as the rubber ring 13 is pressed against the receiving port 2b, leakage of the buoyancy material a is prevented, and before the receiving port 2b reaches the front expansion / contraction tube 12a, the three-way valve of the hose 14 of the front expansion / contraction tube 12a The outlet 2b is inserted and slid into the rubber ring 13 while discharging the air b inside (FIG. 4D).

  When the rear expansion / contraction tube 12b reaches the propulsive force transmission member 8 of the receiving port 2b (FIG. 5e)), the air b is supplied and expanded in the open state of the on-off valve of the hose 14 of the expansion / contraction tube 12b. The new tube 2 is further pushed in, and the rear expansion / contraction tube 12b is pressed against the outer peripheral surface of the insertion port 2a of the subsequent new tube 2 (figure (f)), and leakage of the buoyancy material a can be prevented by this pressure contact. Then, the new pipe 2 is further pushed in, and eventually, the air b is supplied to the front expansion / contraction tube 12a to be inflated to be brought into pressure contact with the outer peripheral surface of the insertion opening 2a of the subsequent new pipe 2 ((g) in the figure).

Thereafter, the insertion 2a of the new tube 2 is inserted into the receiving port 2b of the future new tube 2 in succession and pushed together, and the same action as described above is performed at the receiving port 2b. The new pipe 2 is propelled toward the pit T of the sheath pipe 1 without causing leakage of the buoyancy material a.

The propulsion insertion of the new pipe 2 proceeds, and as shown in FIG. 8 (a), the insertion opening 2a of the earliest new pipe 2 approaches the arrival tunnel T, and as shown in FIG. 8 (b), the insertion opening When 2a fits into the distal end cylindrical portion 24 of the jig 20, the jig 20 is centered with water-stop (with the other end of the sheath 1 closed). At this time, even if the core is displaced before the insertion opening 2 a enters the jig 20, the center is brought into contact with the inner surface of the truncated cone portion (tapered portion) 23.
If the insertion slot 2a fits in the jig 20, the water stop lid 21 is removed, and the insertion slot 2a of the new pipe 2 is further projected into the access shaft T by the required length, as shown in FIG. . At this time, leakage of the buoyancy material a is prevented by the rubber ring 25. If the insertion port 2a is protruded to the required length in the arrival shaft T, the cap 30 is removed ((d) in the figure). Thereafter, after the required time, the buoyancy material a hardens to become a filler. At this time, if the buoyancy material a is not filled in the entire cross-section of the sheath 1, it is replenished and filled in the entire area.

In this embodiment, the cylindrical tube 11 of the water stop mechanism 10 on the start pit S side is not attached to the inner surface of the sheath tube 1, as shown in FIGS. It can be attached via 43b. The outer packing 43b can be welded.
In this way, an installation space for the expansion / contraction tube 12a and the like can be secured regardless of the gap between the outer diameter of the sheath tube 1 and the new tube 2, so that the gap between the inner diameter of the sheath tube 1 and the outer diameter of the new tube 2 is narrow. It is effective when sufficient water stop performance cannot be expected.

Further, water can be used for the buoyancy material a in place of the post-curing friction reducing material, and at that time, after propulsion insertion of the new pipe 2 into the entire length of the sheath 1, the water is replaced with the filler. In this case, for example, as shown in FIG. 11, an injection tube 44 is inserted between the sheath tube 1 and the expansion / contraction tubes 12a and 12b and the rubber ring 13, and a filler such as mortar is injected from the injection tube 44. To be able to. At this time, since the specific gravity of the filler such as mortar is larger than that of water, the filler is gradually filled from the bottom of the sheath tube 1, and as the filling, the water is removed from the air vent 41 or the discharge hole 45 at the other end of the sheath 1. (See FIG. 9).
When this injection tube 44 is used, as shown in the figure, the cylindrical tube 11 of the water stop mechanism 10 is provided on the outer surface of the sheath tube 1 so that a wide gap between the sheath tube 1 and the new tube 2 can be secured. Is preferred.

Further, as shown in FIG. 12, a buoyancy material supply / discharge tube 15 with a supply / discharge valve 15a is provided in the cylindrical tube 11, and the buoyancy material a is injected into the sheath tube 1 from this supply / discharge tube 15, or the buoyancy material a is injected. It can also be made to discharge. Level of the axis C ₂ of the new tube 2 may be adjusted by appropriately feeding that fluid such as water to the sheath tube 1. At this time, it can be used together with level adjustment of the buoyancy material a.
Since the level adjustment of the axial center C ₂ by feeding the fluid into the sheath tube 1 can be performed even if the liquid level of the buoyancy material a fluctuates, the filler between the sheath tube 1 and the new tube 2 can be buoyant. It is advantageous when the material a is also used. For example, the amount of buoyancy material a injected is set so that the sheath tube 1 is filled with the buoyancy material a at the stage where the loading of the new tube 2 into the sheath tube 1 is completed (the state shown in FIG. 9). be able to. At this time, the filling amount of the buoyant material a to be filled may be satisfied from the beginning (FIG. 5A) or may be satisfied in the middle.

  As the post-curing type friction reducing material, a material obtained by adding a retarder to mortar may be employed. Incidentally, the post-curing friction reducing material of the example is cured after about one month after filling.

  The expansion / contraction tubes 12a and 12b and the rubber ring 13 are not necessarily provided. For example, as shown in FIG. 13, one expansion / contraction tube 12 is provided, and the expansion of the tube 12 depends on the amount of fluid supplied to the tube 12. By adjusting the degree, the tube 12 is pressed and slid at a constant pressure corresponding to the change in the diameter of the outer peripheral surface of the new tube 2 as shown in FIGS. It may be possible to prevent leakage. At this time, the number of the expansion / contraction tubes 12 is arbitrary.

Further, as shown in FIG. 14 or FIG. 15, a front or rear expansion / contraction tube 12 a or 12 b (expansion / contraction tube 12) and a rubber ring 13 are provided, and the expansion or contraction is caused by the amount of fluid supplied to the expansion / contraction tube 12. By adjusting the expansion degree of the contraction tube, the expansion / contraction tube 12 is pressed and slid at a constant pressure corresponding to the change in the diameter of the outer peripheral surface of the new tube 2 as shown in FIGS. Thus, leakage of the buoyancy material a can be prevented.
At this time, in the former, when the expansion / contraction tube 12 is separated from the receiving port 2b, the supply amount is adjusted so that the expansion / contraction tube 12 is in pressure contact with the outer peripheral surface of the straight tube portion, and the expansion port 12b is expanded. When the contraction tube 12 climbs, the fluid b may be released, and the latter adjusts the supply amount when the expansion / contraction tube 12 climbs to the receiving port 2b, so that the expansion / contraction tube 12 becomes the outer peripheral surface of the receiving unit. The fluid b is supplied to the expansion / contraction tube 12 until the rubber ring 13 is separated from the receiving port 2b, and the straight tube is pressed to eliminate leakage.

The expansion / contraction tubes 12a, 12b, 12 and the rubber ring 13 do not need to be attached to the sheath tube 1 via the cylindrical tube 11, but can be directly attached to the sheath tube 1.
In addition, the shape of the jig 20 is not limited to the illustration, and may be, for example, a cannula. Furthermore, the other end side (the jig 20 side) of the sheath tube 1 can be closed by the same structure as the water stop mechanism 10 with the cap 30 shown in FIG. In this case, the cap of the water stop mechanism has a diameter larger than that of the cap 30, and centering is performed by fitting the new tube insertion opening 2a (cap 30) into the cap.

The caps 30 are not limited to the illustrated cap shape, but the function of the water stop lid on the start pit S side (preventing leakage of the buoyant material a when the front pipe 2 is inserted), the end face water stop and the sheath pipe of the front pipe 2. Any material and shape can be used as long as the other end water stop function (prevention of inflow of the buoyancy material a into the new pipe 2 and closure of the other end of the sheath) can be exhibited.
Further, after the cap 30 is fitted to the tip of the new tube 2, the tip of the new tube (cap) can be inserted into one end of the sheath tube 1. In this case, the buoyancy material a is filled in the sheath tube 1 after the new tube 2 is inserted.

  In this connection, if the new tube 2 is propelled and inserted into the sheath tube 1 with buoyancy, no large force is required for the propulsion. Therefore, when the propellant is inserted via the propulsive force transmission member 8 as in the embodiment, the propulsive force The transmission material 8 has an advantage that a material having a relatively low mechanical strength such as the above resin foam can be used. In addition, it goes without saying that the sheath pipe 1 is not limited to the existing pipe. However, in the pipe-in-pipe method in which the new pipe 2 having the earthquake-resistant pipe joint is propelled and inserted into the existing pipe, the propulsive force is extremely small. More effective.

The pipe joint structure is not limited to that of the embodiment, and it is possible to adopt well-known non-seismic types such as PII type, S type, NS type, SII type, and non-seismic types such as A type and K type. is there. Further, the structure of thrust transmission is not limited to the illustrated propulsive force transmission member 8 or the like.
Furthermore, the insertion promotion of the new pipe 2 can also be performed from the arrival shaft T side.
Moreover, it cannot be overemphasized that the said Example can be employ | adopted for the said sheath pipe | tube propulsion method which the sheath pipe | tube 1 was newly embed | buried not only in the existing pipe (it is not restricted to a pipe-in-pipe construction method) but a fume pipe | tube and a steel pipe.

Schematic sectional view of one embodiment Cross-sectional view of the main part at the time of insertion into the sheath pipe of the earliest new pipe of the same embodiment Cross-sectional view of water stoppage on the sheath pipe reaching mine (other end) side of the same embodiment FIG. Insertion of the earliest new pipe into the sheath pipe of the same embodiment example Propeller insertion action diagram of sheath pipe start pit (one end) part of new pipe receiving part of same embodiment Enlarged view of the action Figure of the action of inserting the sheath of the earliest new pipe in the same embodiment into the water stop of the pipe reach (other end) side Schematic sectional view of another embodiment Main part enlarged view of the same embodiment Schematic sectional view of another embodiment Schematic sectional view of another embodiment Propeller insertion action figure of sheath pipe start pit part of new pipe receiving part of other embodiments Propeller insertion action figure of sheath pipe start pit part of new pipe receiving part of other embodiments Propeller insertion action figure of sheath pipe start pit part of new pipe receiving part of other embodiments Schematic of sheath tube propulsion method Cross section of PII joint

Explanation of symbols

1 sheath pipe (existing pipe)
2 New pipe 3 Water stop rubber ring 4, 4a, 4b Lock ring 8 Propulsion transmission material 10 Saddle pipe start pit side water stop mechanism 11 Cylindrical pipes 12, 12a, 12b of water stop mechanism Expansion / contraction tube 13 Rubber ring (elastic tube )
14 Hose 15a for supplying / discharging fluid to expansion / contraction tube 20 Supply / discharge valve 20 Sheath pipe pit side water stop and centering jig 21 Water stop lid 30 Newest tube insertion cap a Buoyant material b Expansion / contraction tube Expansion / contraction fluid (air)

Claims (18)

When the new tube 2 is sequentially inserted into the sheath tube 1 embedded in the underground W from one end S to the other end T, both ends of the sheath tube 1 are closed, and the sheath tube 1 is inserted into the sheath tube 1. In the sheath propulsion method in which the buoyancy material a is injected to give buoyancy to the new tube 2 and the friction between the new tube 2 and the sheath tube 1 is reduced.
A tube 12 that expands and contracts the sheath 1 on one end side of the sheath tube 1 by supplying and discharging the fluid b is provided around the inner surface of the sheath tube 1, and the tube 12 is expanded by the supply amount or supply pressure of the fluid b to the tube 12. A sheath tube propulsion method in which the tube 12 is adjusted in accordance with the diameter change of the outer peripheral surface of the new tube 2 by adjusting the degree. When the new tube 2 is sequentially inserted into the sheath tube 1 embedded in the underground W from one end S to the other end T, both ends of the sheath tube 1 are closed, and the sheath tube 1 is inserted into the sheath tube 1. In the sheath propulsion method in which the buoyancy material a is injected to give buoyancy to the new tube 2 and the friction between the new tube 2 and the sheath tube 1 is reduced.
The splicing part of the new pipe 2 is a part in which the insertion port 2a is inserted into the receiving port 2b and the receiving port 2b bulges out from the straight pipe part having the insertion port 2a, The sheath tube 1 is closed at one end side by placing the elastic tube 13 and the tube 12 that expands and contracts by supplying and discharging the fluid b around the inner surface of the sheath tube 1 with the expansion / contraction tube 12 in front of the new tube 2 in the insertion direction. The sheath tube 1 is provided separately in the axial direction, and the expansion tube 12 and the elastic tube 13 are pressed against the outer peripheral surface of the new tube 2, and the elastic tube 13 is a bulge receiving portion of the new tube 2. The inner diameter is in pressure contact with the outer peripheral surface and not in contact with the outer peripheral surface of the straight pipe portion of the new pipe 2.
When the straight tube portion is inserted into one end of the sheath tube 1, the expansion / contraction tube 12 is expanded and slid into pressure contact with the outer peripheral surface of the straight tube portion to enter one end of the joint portion sheath tube 1. When the expansion tube 12 is inserted, the expansion tube 12 is inflated and pressed against the outer peripheral surface of the straight pipe portion, and the front portion of the joint portion is inserted into the elastic tube 13 and pressed against the outer peripheral surface of the bulge receiving port portion. After that, the fluid b of the expansion / contraction tube 12 is discharged, and the joint portion is inserted and slid into the elastic tube 13. When the expansion / contraction tube 12 reaches the rear portion of the joint portion, the expansion / contraction occurs. While the fluid b is supplied to the tube 12, the joint portion is further inserted, and the expansion / contraction tube 12 is eventually brought into pressure contact with the outer peripheral surface of the straight tube portion, so that the joint portion exceeds the elastic tube 13 and the expansion / contraction tube 12. Characteristic sheath tube propulsion method. When the new tube 2 is sequentially inserted into the sheath tube 1 embedded in the underground W from one end S to the other end T, both ends of the sheath tube 1 are closed, and the sheath tube 1 is inserted into the sheath tube 1. In the sheath propulsion method in which the buoyancy material a is injected to give buoyancy to the new tube 2 and the friction between the new tube 2 and the sheath tube 1 is reduced.
The splicing part of the new pipe 2 is a part in which the insertion port 2a is inserted into the receiving port 2b and the receiving port 2b bulges out from the straight pipe part having the insertion port 2a, The clogging of the one end side of the sheath tube 1 is performed by placing the elastic tube 13 and the tube 12 that expands and contracts by supplying and discharging the fluid b around the inner surface of the sheath tube 1 so that the expansion / contraction tube 12 is on the rear side in the insertion direction of the new tube 2. The sheath tube 1 is provided separately in the axial direction, and the expansion tube 12 and the elastic tube 13 are pressed against the outer peripheral surface of the new tube 2, and the elastic tube 13 is a bulge receiving port of the new tube 2. The inner diameter is in pressure contact with the outer peripheral surface of the section and not in contact with the outer peripheral surface of the straight pipe section of the new pipe 2.
When the straight tube portion is inserted into one end of the sheath tube 1, the expansion / contraction tube 12 is expanded and slid into pressure contact with the outer peripheral surface of the straight tube portion to enter one end of the joint portion sheath tube 1. When the expansion / contraction tube 12 is inserted, the fluid b is discharged from the state in which the expansion / contraction tube 12 is expanded and pressed against the outer peripheral surface of the straight pipe portion, and the front portion of the joint portion is inserted and slid into the expansion / contraction tube 12. Eventually, the elastic tube 13 is inserted into the elastic tube 13 and brought into pressure contact with the outer peripheral surface of the bulging receiving port portion. Further, when the joining portion is inserted and the rear portion reaches the expansion / contraction tube 12, the expansion / contraction tube 12. The sheath b is propelled by supplying the fluid b to the outer periphery of the straight pipe portion and inserting the joint portion, and the joint portion eventually exceeds the elastic tube 13 and the front expansion / contraction tube 12. Construction method. When the new tube 2 is sequentially inserted into the sheath tube 1 embedded in the underground W from one end S to the other end T, both ends of the sheath tube 1 are closed, and the sheath tube 1 is inserted into the sheath tube 1. In the sheath propulsion method in which the buoyancy material a is injected to give buoyancy to the new tube 2 and the friction between the new tube 2 and the sheath tube 1 is reduced.
The splicing part of the new pipe 2 is a part in which the insertion port 2a is inserted into the receiving port 2b and the receiving port 2b bulges out from the straight pipe part having the insertion port 2a, The clogging of the one end side of the sheath tube 1 is made by providing tubes 12a and 12b that expand and contract by the supply and discharge of the fluid b around the inner surface of the sheath tube 1 at the front and rear sides of the sheath tube 1 in the axial direction. The elastic tube 13 is provided on the entire inner circumference of the sheath 1 between the sheaths 12a and 12b, and the expansion and contraction tubes 12a and 12b and the elastic tube 13 are pressed against the outer peripheral surface of the new tube 2, and the elastic tube 13 is The inner diameter of the new pipe 2 is in pressure contact with the outer peripheral surface of the bulge receiving portion and not in contact with the outer peripheral surface of the straight pipe portion of the new pipe 2,
When the straight tube portion is inserted into one end of the sheath tube 1, the expansion / contraction tubes 12 a and 12 b are expanded and slid into pressure contact with the outer peripheral surface of the straight tube portion. At the time of insertion, the expansion / contraction tubes 12a and 12b are inflated and pressed against the outer peripheral surface of the straight tube portion, while the fluid b of the rear expansion / contraction tube 12b is discharged, and the front portion of the joint portion Is inserted and slid into the tube 12b on the rear side and eventually inserted and slid into the elastic tube 13, and when the front portion of the joint portion reaches the front expansion / contraction tube 12a, the fluid b of the front expansion / contraction tube 12a is discharged. While being discharged, the joint portion is further inserted and slid into the front expansion / contraction tube 12a and the elastic tube 13, and when the rear expansion / contraction tube 12b exceeds the joint portion, the rear expansion / contraction tube 12b. Supply fluid b to Inflating is pressed against the straight tube portion outer peripheral surface, then the sheath pipe jacking method, wherein more than the unit seaming the elastic tube 13 and the front deflating tube 12a.   A cap 30 is fitted on the sheath tube 1 via the expansion / contraction tube 12 on the inner surface of one end of the sheath tube 1 and one end thereof is closed, and the tip of the earliest new tube 2 is fitted on the cap 30, and the new tube 2 The sheath tube propulsion method according to claim 1, wherein the sheath tube is inserted into the sheath tube 1 together with the cap 30.   6. The jig 20 for closing the other end of the sheath tube 1 by fitting the tip of the earliest new tube 2 to the other end of the sheath tube 1 is provided. The sheath pipe construction method described in 1.   The sheath tube propulsion method according to claim 6, wherein the tip of the earliest new tube (2) is fitted into the jig (20) to close the other end of the sheath tube (1) and to perform centering.   If the tip of the new tube 2 is covered with a cap 30 and the tip of the new tube 2 is closed, and the cap 30 fits into the jig 20, the jig 20 fits the cone into which the cap 30 fits. The sheath tube propulsion method according to claim 6 or 7, wherein the sheath tube propulsion method is used.   The jig 20 includes a cylindrical body 22 that is coaxially fitted to the other end of the sheath tube 1 and a lid 21 that closes the opening of the cylindrical body 22. The sheath tube propulsion method according to any one of claims 6 to 8, wherein the lid 21 is removed after the tip of the sleeve is fitted through the packing 25.   The joint portion of the new pipe 2 is provided with a propulsive force transmission material on the outer peripheral surface of the insertion opening 2a of the new pipe 2, and this propulsive force transmission material has a required length that can move within a range that does not pass through the insertion opening 2a. When the thrust is greater than the propulsive force due to an earthquake or the like, the required force is greater than the propulsive force of the propulsive force transmitting material and can move within a range that does not pass through the insertion slot. The sheath according to any one of claims 1 to 9, characterized in that it has a stretchable earthquake-resistant joint structure in which the middle maintenance of the length is released and the insertion port 2a is further pushed into the receiving port 2b. Pipe propulsion method. When the new tube 2 is sequentially inserted into the sheath tube 1 embedded in the underground W from one end S to the other end T, both ends of the sheath tube 1 are closed, and the sheath tube 1 is inserted into the sheath tube 1. A buoyancy material a is injected to give buoyancy to the new pipe 2, and the sheath structure of the one end side of the sheath pipe 1 in the sheath propulsion method has reduced friction between the new pipe 2 and the sheath pipe 1,
A tube 12 that expands and contracts by the supply and discharge of the fluid b is provided on the entire inner surface of the sheath tube 1, and the tube 12 is adjusted in the degree of expansion of the tube 12 according to the supply amount of the fluid b. A sheath structure on one end side of the sheath tube, wherein one end of the sheath tube 1 is blocked in response to a change in diameter of the sheath tube.   An elastic tube 13 is further provided on the entire inner circumference of the front or rear sheath 1 of the expansion / contraction tube 12. The elastic tube 13 is in pressure contact with the outer peripheral surface of the receiving portion of the new tube 2 and is a straight tube of the new tube 2. The closed structure on one end side of the sheath tube according to claim 11, wherein the inner diameter is not in contact with the outer peripheral surface of the portion.   The closure structure on one end side of the sheath tube according to claim 12, wherein the expansion / contraction tubes 12a and 12b are provided on both sides of the elastic tube 13.   The supply / discharge of the fluid b to / from the expansion / contraction tubes 12a, 12b does not correspond to the change in the diameter of the outer peripheral surface of the new pipe 2, and the pressure supply operation to the straight pipe portion of the new pipe 2 and the pressure contact 14. The closing structure on one end side of the sheath tube according to claim 13, characterized in that it has only a discharging action to leave.   15. The expansion / contraction tube 12 or its expansion / contraction tubes 12, 12a, 12b and an elastic tube 13 are provided on the inner surface of a cylindrical body 11 fitted to the outer surface of one end of the sheath tube 1. A closure structure on one end side of the sheath tube according to any one of the above.   On the sheath tube 1 side of the expansion / contraction tube 12 of the cylindrical body 11 or the expansion / contraction tubes 12, 12a, 12b and the elastic tube 13, a supply / discharge valve 15a for the buoyancy material a in the sheath tube 1 is provided. The closure structure of the one end side of the sheath pipe | tube in any one of Claims 11 thru | or 15 characterized by the above-mentioned.   The expansion / contraction tube 12, the expansion / contraction tubes 12, 12a, 12b and the elastic tube 13 used in the closing structure on one end side of the sheath tube according to claim 15 or 16, and the supply / discharge valve 15a in addition to them. The said cylinder which has.   When the new pipe 2 is sequentially inserted into the existing pipe 1 embedded in the underground W from the one end S toward the other end T, the joining portion is formed on the outer peripheral surface of the insertion port 2a of the new pipe 2. A propulsive force transmission material is provided, and this propulsive force transmission material is used for propulsion while maintaining the middle of the required length that can move within a range that does not pass through the insertion slot 2a. When acted, the pressing force is greater than the maintenance force of the propulsive force transmission material, the middle maintenance of the required length that can move within the range that does not pass through the insertion port is released, and the insertion port 2a further extends to the receiving port 2b. A telescopic earthquake-resistant joint structure that is adapted to be pushed in. Both ends of the existing pipe 1 are closed, a buoyant material a is injected into the existing pipe 1 to give buoyancy to the new pipe 2, and the new Sheath pipe propulsion method with reduced friction between pipe 2 and existing pipe 1.

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