JP4738820B2 - Plumbing method into the sheath pipe - Google Patents

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 vertical shafts that have been dug at an appropriate interval, the construction method is to excavate the laying area from the ground and embed 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, mortar or the like is filled between the hollow tube body and the sheath tube and integrated. Conventionally, when a hollow tube body is inserted into the sheath tube, a roller is attached to the lower peripheral surface of the hollow tube body, and this is inserted while rolling the inner wall surface of the sheath tube.

  However, by providing a roller between the hollow tube body and the sheath tube, the diameter of the sheath tube is determined accordingly. As a result, in the configuration in which such a roller is provided, the diameter of the sheath tube becomes larger than in the case where a buffer is provided around, and as a result, the amount of mortar to be filled between the hollow tube and the sheath tube Will increase. In addition, as the piping distance of the hollow tube increases, a larger insertion force is required, and the apparatus for that purpose is increased in size.

  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. 12, when the hollow tube body 32 is inserted into the sheath tube 31 embedded between the compatible shafts, the open end of the sheath tube 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, by adjusting the water level while floating the hollow tube 32 in the water 36, the hollow tube 32 is inserted into the sheath tube 31 with the center of the hollow tube body and the center of the sheath tube substantially aligned. is there.

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.
Japanese Patent No. 3278275

  By the way, in the above-described conventional tube insertion method, the hollow tube is inserted into the sheath tube while being floated with water, with the center of the hollow tube being substantially coincident with the center of the sheath tube. Thereby, it is possible to realize easy and quick insertion with a small driving force without causing the hollow tube body to slide in contact with the inner peripheral surface of the sheath tube. Actually, in order to make the center of the hollow tube and the center of the sheath tube substantially coincide with each other, the main tube (hollow tube) can be adjusted by adjusting the amount of water to be put into the sheath tube or other than in the sheath tube. Adjust the buoyancy by putting an appropriate amount of water in the body.

  However, as a matter of fact, it takes a lot of labor to adjust the water level so as to maintain the center of the hollow tube body and the center of the sheath tube substantially coincident with each other. In particular, if the water level is adjusted in a sheath pipe that is buried horizontally from the main insertion shaft to the main arrival shaft, these pipes are still installed in a state where they are inclined downward. It is extremely difficult to adjust the water level to make the body centers approximately coincident.

  Incidentally, in the above-mentioned Patent Document 1, a technique is disclosed in which a hollow tube body is inserted in the same inclination direction as a sheath pipe arranged in a state of being inclined downward. However, since the disclosed technique shown in Patent Document 1 is based on the premise that water is put into the main pipe (hollow tube body), it is inevitable that the number of work steps increases accordingly.

Furthermore, the disclosed technique shown in Patent Document 1 assumes a straight sheath tube, and the height dimensional difference between both ends according to the inclination of the sheath tube is within the inner diameter dimensional difference of the sheath tube (approximately Horizontal), the sheath tube is slightly steep (roughly not horizontal) than the inclination, or is not configured in a straight line, or the weight of the hollow tube body is It cannot be applied if it exceeds buoyancy and does not float.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to make the center of the hollow tube body not substantially coincide with the center of the sheath tube, Even if the water level is not adjusted, the sheath tube is laid horizontally, the inclination angle of the sheath tube is steeper (even if it is not substantially horizontal), or it is not configured linearly Alternatively, it is an object of the present invention to provide a piping method into a sheath tube that can be easily inserted even if the hollow tube does not float.

  In order to solve the above-mentioned problems, the present invention stores liquid in a sheath tube when inserting a hollow tube into a sheath tube embedded from a main tube insertion side shaft to a main tube arrival side shaft, It inserts in a sheath tube using the buoyancy of the liquid which stored the hollow tube body in which the annular spacer was attached to the surface. At this time, the hollow tube body is inserted while being in sliding contact with the inner peripheral surface of the sheath tube via an annular spacer on the outer peripheral surface thereof.

That is, the piping method to the inside of the sheath pipe according to the present invention is the inside of the sheath pipe that is buried in a downwardly inclined manner from the main pipe insertion side shaft to the main pipe arrival side shaft and opens toward at least the main pipe insertion side shaft. In the piping method into the sheath tube for inserting the hollow tube into the liquid storage step of storing the liquid in a part of the entire sheath tube, and the hollow tube body in which the annular spacer is attached to the outer peripheral surface, A tubular body insertion step of inserting the buoyancy of the stored liquid into the sheath tube, and in the tubular body insertion step, only the vicinity of the tip of the hollow tubular body is pushed up by the buoyancy and the outer periphery thereof The surface is inserted while being brought into sliding contact with the inner peripheral surface of the sheath tube through an annular spacer.

  In the present invention, when a hollow tubular body is inserted into a sheath pipe embedded from a main pipe insertion side shaft to a main pipe arrival side shaft, liquid is stored in the sheath pipe, and an annular spacer is attached to the outer peripheral surface. The tube is inserted into the sheath tube while floating using the buoyancy of the liquid in which the hollow tube is stored. At this time, the hollow tube body is inserted while being in sliding contact with the inner peripheral surface of the sheath tube via an annular spacer on the outer peripheral surface thereof.

  Thereby, in this invention, since the thrust of a hollow tube can be made small and adjustment of the liquid level in a liquid becomes unnecessary, it becomes possible to reduce a labor significantly. Even if the sheath tube is laid horizontally, inclined, or not configured linearly, or even if the hollow tube does not float, the hollow tube body can be produced with a small propulsive force. Can be inserted.

  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. An empty tube body 14 and an annular spacer 16 disposed on the outer peripheral surface of the hollow tube body 14 are provided.

  The sheath pipe 13 is embedded in a state where it is inclined downward from the main pipe insertion side shaft 11 to the main pipe arrival side shaft 12. In the sheath tube 13, the liquid 15 is stored in a fully filled state in order to give an appropriate buoyancy to the hollow tube body 14. The sheath pipe 13 is fixed in a state of protruding into the main pipe insertion side shaft 11 and the main pipe arrival side shaft 12. An end portion 13 b of the sheath tube 13 protruding toward the main pipe arrival side shaft 12 is closed in a sealed state by a blind cover 19. In addition, a water pipe 20 is connected to the end face 13a of the sheath pipe 13 that protrudes toward the main pipe insertion side shaft 11 side. An annular sealing material 21 is disposed inside the end face 13 a of the sheath tube 13.

  The sealing material 21 is composed of rubber, a synthetic resin plate-like material, a hollow tube, or the like. This sealing material 21 is elastically deformable so that it can be restored and pressed against the outer surface of the hollow tube 14 after the annular spacer 16 disposed on the outer peripheral surface of the hollow tube 14 has passed. There is a need to. In addition, since the resistance at the time of insertion will increase if this sealing material 21 uses a material with an excessively high elastic modulus, it is desirable to use a material with a low elastic modulus as much as possible.

  The water pipe 20 is provided on the upper part of the sealing material 21. The water pipe 20 may be provided with a valve (not shown) for injecting the liquid to be stored in the sheath pipe 13 and a pump (not shown) for discharging the liquid stored in the sheath pipe 13. FIG. 2 shows a configuration in which a water injection pipe 61 is provided on the blind cover 19 on the main pipe arrival side vertical shaft 12 side as an alternative to the water pipe 20. The water injection pipe 61 may be provided with a valve (not shown) for injecting the liquid 15 and a pump (not shown) for discharging the liquid 15.

  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.

  As the annular spacer 16, a plastic molded product having a projection height of about 5 cm and a width of about 30 cm from the outer surface of the hollow tube body 14 is mainly applied. For example, as shown in a perspective view of FIG. It attaches to the hollow tube 14 using the bolt 17 at intervals.

  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.

  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.

  Next, with respect to the sheath pipe 13 embedded from the main pipe insertion side shaft 11 to the main pipe arrival side shaft 12, the end portion 13b is closed in a sealed state by the blind lid 19, and the water pipe 20 is connected to the end portion 13a. Connecting.

  Next, the first hollow tube body is inserted into the end portion 13a, and the liquid 15 is injected through the water tube 20 until the inside of the sheath tube 13 is full, and these are stored. Next, the second and subsequent hollow tube bodies 14 are inserted from the end surface 13 a of the sheath tube 13. When the hollow tube body 14 is inserted, for example, a rail and a traveling frame 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 the insertion end of the hollow tube body 14 may be pushed forward. You may make it perform by attaching the wire 26 to the part 14a and pulling this to the arrow S direction shown in FIG.

  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 all immersed in the liquid 15 and receives buoyancy. As a result, the hollow tube body 14 is pushed upward when the buoyancy exceeds the weight of the hollow tube body, and is slidably contacted with the inner peripheral surface of the sheath tube 13 via the annular spacer 16 over the entire outer peripheral surface thereof. It will be. Further, if the buoyancy is lower than the weight of the hollow tube body, it sinks downward and is slidably contacted with the inner peripheral surface of the sheath tube 13 via the annular spacer 16 over the entire outer peripheral surface thereof.

  FIG. 4 (a) shows a cross-sectional view of the sheath tube 13 and the hollow tube body 14 in the sliding contact state, and FIG. 5 (a) shows a side view thereof. As shown in FIGS. 4 (a) and 5 (a), it can be seen that the central portion 23 of the sheath tube 13 and the central portion 24 of the hollow tube body 14 are different from each other. Further, the hollow tube body 14 is smoothly inserted with the same inclination as the sheath tube 13 while maintaining such a sliding contact state. In this state, the sheath 15 is filled with the liquid 15 to the full.

  Incidentally, as a result of receiving the buoyancy by immersing the hollow tube body 14 in the liquid 15, the hollow tube body 14 has a small propulsive force in the sheath tube 13 in a state of floating with respect to the bottom of the inner peripheral surface of the sheath tube 13. Can be inserted.

  Further, in the case where the hollow tube body 14 is formed by continuing a steel pipe having a certain length as shown in FIG. 5 (a), these are formed in the main pipe insertion side shaft 11 by welding or the like. The hollow tube bodies 14 may be welded together to form a long shape, and then inserted into the sheath tube 13. At this time, the length of the single hollow tube body 14 is determined according to the size of the main tube insertion side shaft 11.

  As a result of the hollow tube 14 being inserted over the entire length of the sheath tube 13 as described above, when the tip of the hollow tube 14 reaches the blind cover 19 of the sheath tube 13, By opening a valve (not shown) provided, the liquid 15 in the sheath tube 13 is discharged.

  By this drainage, the hollow tube body 14 pushed up to the upper end of the inner peripheral surface of the sheath tube 13 gradually descends. And as shown in FIG.5 (c), it drains from the edge part 13b to such an extent that the hollow tube body 14 does not float with respect to the bottom face of the sheath tube 13. FIG. When this drainage is completed, the hollow tube body 14 is placed on the lower inner peripheral surface of the sheath tube 13.

  Next, the mortar 27 is filled in the gap between the inner peripheral surface of the sheath tube 13 and the outer peripheral surface of the hollow tube body 14. FIG. 4B shows a sectional view of the sheath tube 13 after the mortar 27 is filled. After this mortar 27 is properly cured, the blind lid 19 is removed and cured in that state. 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 tubular body insertion device 1, the liquid 15 is stored so as to be filled in the sheath tube 13, so that the outer peripheral surface of the hollow tubular body 14 to be inserted is interposed via the annular spacer 16. Can be brought into sliding contact with the inner peripheral surface of the sheath tube 13. In the conventional construction method, the water level had to be adjusted with high accuracy so that the center of the hollow tube body and the center of the sheath tube substantially coincide with each other. However, in the tube body insertion device 1 to which the present invention is applied, such a water level is required. This makes it possible to greatly reduce the labor in that no delicate adjustment is required. In order to make these centers substantially the same, it is generally necessary to arrange a complicated mechanism for adjusting them on the main arrival side vertical shaft 12 side. This is also useful in that the necessity for installation is eliminated.

  In particular, in the tubular body insertion device 1 to which the present invention is applied, even if the sheath tube 13 is not linear, the height dimensional difference between both ends corresponding to the inclination of the sheath tube 13 is different from the inner diameter dimensional difference of the sheath tube 13. Even if it is not within (substantially horizontal), it can be similarly applied.

  In particular, when the sheath tube 13 is disposed in a state inclined downward, it is extremely difficult to adjust the liquid level so that the centers of the tube bodies 13 and 14 are substantially coincident with each other. However, in the tubular body insertion device 1 to which the present invention is applied, even when the sheath tube 13 is disposed in an inclined state toward the main pipe arrival side shaft 12, the liquid 15 to be injected therein High precision adjustment of the position becomes unnecessary. That is, in the case where the sheath tube 13 is disposed in an inclined state as it is, the present invention has a particularly remarkable effect.

  Furthermore, in this tubular body insertion apparatus 1, since it is not necessary to put water into the hollow tubular body 14, the work process can be further simplified, and the inclination of the sheath tube 13 can be configured at any angle. In other words, in other words, it can be applied even if the height dimensional difference between the both ends of the sheath tube 13 is higher than the inner diameter dimension and has a steep angle, and the versatility of the construction method itself can be improved. It becomes possible.

  Incidentally, in the present invention, it is assumed that the hollow tube body 14 provided with the annular spacer 16 on the outer peripheral surface is inserted while being brought into sliding contact with the inner peripheral surface of the sheath tube 13. For this reason, a resistance force is applied in the direction opposite to the insertion direction of the hollow tube body 14 by the friction based on the sliding contact. However, even if such a resistance force is applied to the hollow tube body 14, the hollow tube body 14 itself is in a state of being floated by its buoyancy, and thus has little influence on the propulsive force. .

  FIG. 6 shows a tube insertion device 2 as another embodiment. In this tubular body insertion device 2, the same components and members as those in the tubular body insertion device 1 described above are denoted by the same reference numerals, and the description thereof will be omitted. The liquid 15 is not stored in the tube 13 until it is full, but only a part of the entire sheath tube 13 is stored.

  When the hollow tube body 14 is inserted into the sheath tube 13 in which the liquid 15 is stored in this way, only the tip 14a is immersed in the liquid 15 as shown in FIG. The amount of immersion of the hollow tube body 14 into the liquid 15 is reduced. As a result, the buoyancy received by the hollow tube body 14 increases as it approaches the tip 14a and decreases as it moves rearward. For this reason, as shown in FIG. 6, only the vicinity of the tip 14 a that receives a large buoyancy is pushed upward and is brought into sliding contact with the inner peripheral surface of the sheath tube 13 via the annular spacer 16.

  Similarly, in this tubular body insertion device 2, it is not necessary to adjust the water level so that the center of the hollow tubular body 14 and the center of the sheath tube 13 are substantially coincident with each other, so that labor can be greatly reduced. Become.

  In addition, the tubular body insertion device 2 has a smaller contact area between the inner circumferential surface of the sheath tube 13 and the outer circumferential surface of the hollow tubular body 14 via the annular spacer 16 than the tubular body insertion device 1. Therefore, the resistance force caused by friction can be further reduced, and the influence on the propulsive force can be further suppressed.

  In the present invention, as shown in FIG. 7 below, the blind cover 19 to be disposed at the end 13b of the sheath tube 13 may be omitted. In such a case, the liquid 15 is also stored in the main pipe arrival side shaft 12. Since the sheath pipe 13 is embedded so as to incline downward toward the main pipe arrival side shaft 12, by injecting the liquid 15 into the main pipe arrival side shaft 12, the inside of the sheath pipe 13 is also injected. It will be filled with the liquid 15.

  Incidentally, FIG. 7 (a) is an example in which the liquid 15 is stored over the sheath tube 13 by injecting the liquid 15 from the main shaft arrival side shaft 12, and FIG. In this example, the liquid 15 is stored in a part of the sheath tube 13 by injecting the liquid 15 from the side shaft 12. The same effects as described above can be obtained by any method.

  In this example, when the liquid 15 actually stored in the sheath pipe 13 or the main pipe reaching side shaft 12 is drained, for example, as shown in FIG. Alternatively, the pump 29 may be used. Further, as shown in FIG. 7 (b), by providing a pump 29 in the main shaft insertion side shaft 11, the liquid 15 overflowing from the sheath tube 13 into the main tube insertion side shaft 11 may be drained. Good.

  Moreover, even when the sheath tube 13 is embedded so as to be bent at a plurality of different inclination angles of 0 ° or more, the hollow tube body 13 can be inserted by using the above-described method. It becomes. In particular, in the method to which the present invention is applied, the hollow tube body 13 can be inserted even when the inclination angle of the sheath tube 13 reaches 20 °.

  FIG. 8 shows a state in which the sheath tube 13 is embedded in a state where it is inclined downward from the main tube insertion side shaft 11, and is embedded in the horizontal direction from the middle to the main tube arrival side shaft 12. FIG. 8 (a) shows an example in which the end portion 13b of the sheath pipe 13 protruding toward the main shaft reaching side shaft 12 is closed in a sealed state by the blind cover 19, and FIG. 8 (b) An example in which the blind lid 19 to be disposed at the end portion 13b of the sheath tube 13 is omitted and the liquid 15 is stored from the main pipe arrival side shaft 12 side is shown.

  Also in the example shown in FIG. 8, the liquid 15 is stored in a full state in the sheath tube 13. As a result, the hollow tube body 14 is all immersed in the liquid 15, and is lifted up and down by receiving buoyancy over the entire length, and further, the annular spacer 16 is stretched over the entire outer peripheral surface thereof. It will be slidably contacted with the inner peripheral surface of the sheath tube 13 via the. Since the resistance force by this sliding contact is small, the propulsive force of the hollow tube 14 to be inserted can be greatly reduced. Further, even when the sheath tube 13 is embedded in a complicated shape as in the example shown in FIG. 8, the labor can be greatly reduced in that the adjustment of the water level is not essential. .

  FIG. 9 shows a state in which a part of the sheath tube 13 is filled with the liquid 15 in the example shown in FIG. In the region A embedded in the sheath tube 13 in the horizontal direction, the liquid 15 is injected until it is full, and in the region B embedded in an inclined shape downward, the liquid 15 is only partly included. Being injected. FIG. 9 (a) shows an example in which the end portion 13b of the sheath pipe 13 protruding toward the main pipe arrival side shaft 12 side is closed in a sealed state by the blind cover 19, and FIG. 9 (b) An example in which the blind lid 19 to be disposed at the end portion 13b of the sheath tube 13 is omitted and the liquid 15 is stored from the main pipe arrival side shaft 12 side is shown.

  When the hollow tube body 14 is inserted in the horizontal direction from the middle of the sheath tube 13 to the main pipe arrival side shaft 12, as a result of receiving buoyancy over the entire length thereof, the annular spacer 16 is formed over the entire length of the outer peripheral surface. It is slidably contacted with the inner peripheral surface of the sheath tube 13. On the other hand, when the hollow tube body 14 is inserted while being inclined downward from the main tube insertion side shaft 11, as a result of being immersed in the liquid 15 from the tip thereof, the hollow tube body 14 receives a larger buoyancy. As a result, it will be pushed up toward the tip.

  In the example shown in FIG. 9, the same effect as described above can be obtained.

  In the above-described embodiment, the explanation has been made on the assumption that the hollow tube body 14 provided with the annular spacer 16 on the outer peripheral surface is inserted while being in sliding contact with the inner peripheral surface of the sheath tube 13, It is not limited to such a configuration.

  FIG. 10 shown as a reference example shows a configuration example when the hollow tube body 14 is inserted without being brought into sliding contact with the inner peripheral surface of the sheath tube 13 via the annular spacer 16. FIG. 10 (a) shows an example in which the end portion 13b of the sheath tube 13 protruding toward the main pipe arrival side shaft 12 side is closed in a sealed state by the blind cover 19, and FIG. 10 (b) An example in which the blind lid 19 to be disposed at the end portion 13b of the sheath tube 13 is omitted and the liquid 15 is stored from the main pipe arrival side shaft 12 side is shown.

  Both the regions A and B embedded in the horizontal direction in the sheath tube 13 are not filled until the liquid 15 is filled, and only a part thereof is stored. As a result of the hollow tube body 14 inserted into the sheath tube 13 being immersed in the liquid 15 only at the lower portion of the outer peripheral surface, the buoyancy itself with respect to the liquid 15 is reduced, and the outer peripheral surface is in contact with the inner peripheral surface of the sheath tube 13. Disappear.

  Even in the configuration shown in FIG. 10, when the sheath tube 13 is disposed in an inclined state as it is, it is not necessary to adjust the liquid level so that the centers of the tube bodies 13 and 14 substantially coincide with each other. It becomes possible to reduce the burden of labor.

  Further, in the above-described embodiment, the case where the sheath tube 13 is embedded so as to face downward in the B region and the sheath tube 13 is embedded in the A region so as to be in the horizontal direction is described as an example. However, the present invention is not limited to such a configuration. For example, any region may be used as long as both the A region and the B region are embedded at different angles. Moreover, in embodiment mentioned above, although the case where two area | regions A and B which differ for every angle of the sheath tube 13 were provided was demonstrated as an example, the case where three or more area | regions which differ for every angle were provided may be mentioned. Similar effects can be obtained. Furthermore, in the present invention, even when the sheath pipe 13 is buried in a horizontal direction with respect to a straight line connecting the main pipe insertion side shaft 11 and the main pipe arrival side shaft 12, it can be similarly realized. Moreover, in this invention, even when the sheath pipe | tube 13 is not embed | buried linearly, it is realizable similarly. That is, the hollow tube body 14 can be inserted even if the sheath tube 13 is bent and disposed in each of the upper, lower, left and right directions, or is bent in the respective directions from the middle. .

  In the present invention, for example, as shown in FIG. 11, in the hollow tube 14 to be inserted, since the weight of the hollow tube exceeds the buoyancy, it does not rise even if buoyancy is applied. There are also things. In such a case, the hollow tube body 14 is inserted through the annular spacer 16 while the bottom portion of the sheath tube 13 is in sliding contact. This also makes it possible to apply buoyancy to the hollow tube body 14, which makes it possible to reduce the propulsive force and further eliminates the need for liquid level adjustment.

  Furthermore, in embodiment mentioned above, although the case where the sheath pipe | tube 13 was embed | buried in the state inclined as it is from the main pipe insertion side vertical shaft 11 to the main pipe arrival side vertical shaft 12 was demonstrated, this structure Of course, the present invention can be similarly applied to the case where the sheath pipe 13 is buried in an upwardly inclined manner from the main pipe insertion side shaft 11 to the main pipe arrival side shaft 12. In addition, when the sheath tube is laid horizontally, the hollow tube body may be floated by filling the sheath tube with liquid, and the liquid level is set so that the propulsive force can be reduced. You may plan.

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 structure which provided the water injection pipe and the drain pipe on the blind cover in the main pipe | tube arrival side shaft side. It is a perspective view for demonstrating about an annular spacer. It is sectional drawing of a sheath tube and a hollow tube body at the time of hollow tube body insertion. It is a side view of a sheath tube and a hollow tube body at the time of hollow tube body insertion. It is a figure for demonstrating about the case where a hollow tube is inserted in the sheath tube in which the liquid was stored only in part. It is a figure for demonstrating the structure which abbreviate | omits the blind cover which should be arrange | positioned at the edge part of a sheath pipe, and inject | pours a liquid from the main pipe arrival side shaft side. It is a figure for demonstrating the construction method in case the sheath pipe is embed | buried in the state inclined downward from the main pipe insertion side vertical shaft, and is embed | buried in the horizontal direction from the middle to the main pipe arrival side vertical shaft. It is another figure for demonstrating about the case where a hollow tube is inserted in the sheath tube in which the liquid was stored only in part. It is a figure for demonstrating about other embodiment to which this invention is applied. It is a figure for demonstrating about further another embodiment to which this invention is applied. It is a figure shown about the prior art example which inserts a hollow tube body in a sheath pipe more correctly with a smaller thrust. It is a figure for demonstrating about another prior art example.

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 16 Annular spacer 17 Bolt 19 Blind lid 20 Water tube 21 Sealing material 23, 24 Center part

Claims (2)

Plumbing method into a sheath pipe in which a hollow tube is inserted into a sheath pipe that is embedded in a downwardly inclined manner from a main pipe insertion side shaft to a main pipe arrival side shaft, and is open toward at least the main tube insertion side shaft In
A liquid storage step of storing liquid in a part of the entire sheath tube;
A tubular body insertion step of inserting the hollow tubular body having an annular spacer attached to the outer peripheral surface thereof into the sheath pipe using the buoyancy of the stored liquid,
In the tubular body inserting step, only the vicinity of the distal end of the hollow tubular body is pushed up by the buoyancy, and the outer peripheral surface is inserted while being in sliding contact with the inner peripheral surface of the sheath tube via an annular spacer. Piping method into the sheath pipe.   In the tubular body inserting step, the outer peripheral surface of the root portion of the hollow tubular body is inserted while being brought close to the bottom of the inner peripheral surface of the sheath tube via an annular spacer.
  The piping method to the inside of a sheath pipe of Claim 1 characterized by these.

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