JP2012219914A - Apparatus and method for inserting pipe into sleeve using buoyancy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an excessive load from being applied to a water stop part during pipe inserting work, even when a set position of a pipe is curved flatly, and to speedily move the pipe to the lowest part of a sleeve when releasing a liquid in the sleeve after the inserting work is completed.SOLUTION: A first seal 3 and a second seal which seals fluid-tightly a gap between a sleeve and a pipe 2 and are elastically deformable are provided in a water stop part of an open end at a starting pit side of a sleeve 1. The first seal is disposed at a position deviated from the center of the sleeve at least to right or left and an insertion hole is formed in the central part. An outer shape of the second seal is made into such a long circular shape or an elliptic shape as to cover the area where the first seal is present, in a view from a pedestal end side of the pipe, and the area where the pipe is present when a liquid in the sleeve is released and the pipe is positioned in a lowest part inside the sleeve. In the second seal, an insertion hole is formed at the same position as the insertion hole of the first seal in the view from the pedestal end side of the pipe.

Description

  The present invention relates to a tube insertion device and a tube insertion method for inserting a tube using a buoyancy force into a sheath tube buried in the ground.

Patent Document 1 below discloses a technique in which a liquid is injected into a sheath pipe buried in the ground and a tubular body is inserted into the sheath pipe using the buoyancy caused by the liquid.
That is, in Patent Document 1, as shown in FIGS. 15 and 16, the water stop portions 103 and 104 are provided at both ends of the sheath tube 102 embedded from the starting shaft 100 toward the reaching shaft 101, and the inside of the sheath tube 102 is provided. For example, a technique for inserting the tube body 106 into the sheath tube 102 while minimizing friction with the sheath tube 102 by using the buoyancy of, for example, water 105 stored in the sheath tube 102 is disclosed.

Here, the water stop portion 103 on the start shaft 100 side is provided with elastically deformable plate-like seals 103A and 103B having an insertion hole in the center at intervals, and a drainage portion between the seals 103A and 103B. 107 is provided. During the tube insertion operation, when the spacer 106A attached to the tube 106 gets over the seal 103A, the seal 103B functions to prevent water inside the sheath tube 102 from leaking into the start shaft 100, Further, when the spacer 106A gets over the seal 103B, the seal 103A functions to prevent water inside the sheath tube 102 from leaking into the start shaft 100.
In addition, when the spacer 106A gets over the seal 103B, the water in the sheath tube 102 passes over the seal 103B and flows out between the seals 103A and 103B, but the water flowing out of the spacer 106A gets over the seal 103B. Later, the water is quickly discharged from the drainage unit 107 to the outside.
In FIG. 15, reference numeral 108 denotes a travel base that is a pipe body moving means that presses and moves the proximal end side of the pipe body 106, and reference numeral 109 denotes a liquid level adjusting tank that adjusts the water surface in the sheath tube 102. .

JP 2000-291827 A

  By the way, in the technique of inserting the pipe body into the sheath pipe using the above-described buoyancy, when the set position of the pipe body 106 to be laid is curved in a plane, the pipe body is inserted during the work. A large load is applied to the seals 103 </ b> A and 103 </ b> B as the tube body 106 is displaced in either of the left and right directions at the end of the sheath tube 102. As a result, the seals 103A and 103B are damaged, or the friction between the tube body 106 and the sheath tube 102 is increased, and an excessive burden is placed on the traveling base 108 that presses and moves the tube body 106. was there.

When the set position of the pipe body 106 to be constructed is curved in a planar manner, the positions of the seals 103A and 103B of the water stop portion are shifted in advance in either the left or right direction as indicated by Xa and Xb in FIG. It is conceivable to insert the tube 106 in this state.
However, when the liquid in the sheath tube 102 is withdrawn after completion of the tube insertion operation, the tube body 106 does not receive buoyancy from water and tries to move to the lowermost portion in the sheath tube 102. As described above, since the seals 103A and 103B are set so as to be shifted to the left and right in advance, the seals 103A and 103B block the movement of the tube body 106, and the tube body 106 is moved to the lowest part in the sheath tube 102. When the tube body 106 cannot move or moves to the lowermost part in the sheath tube 102, an excessive load is applied to the seals 103A and 103B to cause damage, and water in the sheath tube 102 leaks from there. Concerned.

  The present invention has been made in view of the above-described circumstances, and even when the setting position of the tubular body is curved in a plane, it is excessive in the water stop portion during the tubular body insertion work. Without removing the load, and when draining the liquid in the sheath after completion of the insertion operation, the tube can be quickly moved to the lowest part of the sheath, and the damage to the water stop is prevented. Provided are a tube insertion device and a tube insertion method for inserting a tube into a sheath tube using buoyancy, which can prevent liquid in the sheath tube from leaking out.

In order to solve the above problems, the present invention proposes the following means.
That is, in the tubular body insertion device into the sheath pipe using the buoyancy according to claim 1 of the present application, the water stop portions are provided at both ends of the sheath pipe buried between the starting shaft and the reaching shaft, and the liquid stored in the sheath tube is stored. A tube insertion device into a sheath tube using buoyancy for inserting a tube body into a sheath tube using buoyancy, wherein the sheath tube and the above-mentioned water stop at the opening end on the start shaft side of the sheath tube A first seal and a second seal for liquid-tightly sealing between the tube bodies are provided spaced from each other from the proximal end side to the distal end side of the tube body. The inside of the sheath tube is disposed at a position shifted from the center of the sheath tube to at least one of the left and right directions, and the outer shape is circular, and an insertion hole through which the tube body is inserted is formed in the center portion. The second seal is formed when the first seal is seen from the proximal end side of the tubular body. The outer shape is made into an oval shape or an elliptical shape so as to cover the region where the tubular body exists when the liquid in the region and the sheath tube is drawn and the tubular body is located at the lowermost portion in the sheath tube, The seal is characterized in that an insertion hole for inserting the tube body is formed at the same position as the insertion hole of the first seal when viewed from the proximal end side of the tube body.

According to this invention, when the tube set position is curved in a plane, the insertion holes of the first seal and the second seal are shifted in advance to the left or right from the center of the sheath tube. Therefore, during the tube insertion operation, a large load is not applied to the first seal and the second seal from the tube, and the first seal and the second seal are damaged. Alternatively, an excessive burden is not applied to the tube moving means for pressing and moving the tube.
Further, if the first seal is removed after the tube insertion operation is completed, the second seal originally covers the region of the tube when it is located at the lowermost part in the sheath tube as viewed from the proximal end side of the tube. If the tube that is no longer subjected to buoyancy from the liquid attempts to move to the lowermost part in the sheath tube when the liquid is drawn from the sheath tube, the second seal is formed. Does not block the movement of the tube. At this time, an excessive load is not applied to the second seal, and the liquid in the sheath tube does not leak from the second seal.

  In the tubular body insertion device into a sheath tube using buoyancy according to claim 2 of the present application, the first seal is pressed and fixed by a seal presser having a circular outer shape, and the second seal is The outer shape is fixed by being pressed by an oval or elliptical seal presser.

  According to the present invention, since the first seal and the second seal are fixed by the seal pressers having the same shape as the seals, the first seal and the second seal are firmly fixed. The liquid from the sheath tube can be prevented from leaking from there.

  A tubular body insertion device into a sheath tube using buoyancy according to claim 3 of the present application includes a lower surface support roller that movably supports the lower surface of the tubular body, and a side surface that movably supports the outer surface of the tubular body. A support roller is provided.

  According to the present invention, the lower surface support roller supports the lower surface of the tubular body to be inserted, and the side surface support roller supports the outer surface of the tubular body. Therefore, when the tubular body is inserted into the sheath tube, the first An excessive load is not applied to the seal, the second seal, and the sheath tube, and the pressing load of the tube moving means for pressing and moving the tube can be reduced.

  A tube insertion method into a sheath tube using buoyancy according to claim 4 of the present application uses the tube insertion device into a sheath tube using buoyancy according to any one of claims 1 to 3, A method of inserting a tube body into a sheath tube using buoyancy for inserting the tube body into a tube, wherein the tube body is moved from the center of the sheath tube at least in any of the left and right directions. A tube insertion step of inserting the respective insertion holes of the seal and the second seal into the sheath tube, and a draining step of removing the internal liquid from the sheath tube after removing the first seal; It is characterized by providing.

  According to the present invention, since the tube body is inserted into the sheath tube from a position shifted at least in either the left-right direction from the center of the sheath tube, the tube body can be smoothly inserted. In addition, since the first seal is removed in advance when the liquid in the sheath tube after the completion of the insertion operation is removed, the tube can be smoothly moved to the lowermost portion in the sheath tube, and the second seal No damage.

  In the tubular body insertion device into the sheath pipe using buoyancy according to claim 1 of the present application, a large load is not applied from the tubular body to the first seal and the second seal during the tubular body insertion work, The first seal and the second seal are not damaged, or an excessive load is not applied to the tube moving means for pressing and moving the tube. Further, when the liquid is drained from the sheath after completion of the tube insertion operation, the tube can be smoothly moved to the lowermost portion in the sheath, and the second seal is not damaged.

  In the tubular body insertion device into the sheath tube using buoyancy according to claim 2 of the present application, the first seal and the second seal can be firmly fixed, and the liquid in the sheath tube leaks from there. Can be prevented.

  In the tubular body inserting device into a sheath tube using buoyancy according to claim 3 of the present application, when the tubular body is inserted into the sheath tube, the side surface support roller and the bottom surface support roller receive a load reaction force, so the first seal In addition, an excessive load is not applied to the second seal or the sheath tube, and the pressing load of the tube moving means for pressing and moving the tube can be reduced.

  In the tubular body insertion method using the buoyancy according to claim 4 of the present application, the same effects as those of the inventions according to claims 1 to 3 described above are achieved.

It is principal part sectional drawing of embodiment of the pipe body insertion apparatus in the sheath pipe using the buoyancy of this invention. It is II arrow directional view of FIG. It is a front view of a sheath pipe connection flange. It is a side view of a sheath pipe connection flange. It is a front view of the 2nd seal. It is a front view of a pressing flange that holds the second seal. It is a front view of a water stop part main body. It is a side view of a water stop part main body. It is a front view of the 1st seal. It is a front view of a pressing flange for pressing the first seal. It is a front view of a pipe body positioning jig. It is a side view of a pipe body positioning jig. It is a front view of a side support part. It is a side view of a side support part. It is the side view which carried out the cross section which showed a part which shows the tubular body insertion apparatus in the sheath pipe | tube using the conventional buoyancy. It is a XVI arrow line view of FIG.

An embodiment of the present invention will be described with reference to FIGS.
In these figures, the details of the water stop portions on the start shaft side of the water stop portions at both ends of the sheath pipe buried between the start shaft and the reach shaft are shown. Since the traveling platform for pressing and moving the end side and the liquid level adjusting means for adjusting the liquid level in the sheath tube are the same as those described in the background art, description thereof will be omitted here.
FIG. 1 is a cross-sectional view of an essential part of an embodiment of a tube body inserting device into a sheath tube using buoyancy of the present invention, and FIG.

1 and 2, reference numeral 1 denotes a sheath pipe, and reference numeral 2 denotes a pipe body to be laid. The sheath tube 1 is buried in advance in the ground over the start shaft and the reach shaft in order to prevent damage to the anticorrosion coating when the tube body 2 is installed and to protect the tube body after installation. In addition to the outer pipes to be installed, the existing pipes that have deteriorated are also included. Spacers 2 </ b> A are attached to the outside of the tube body 2 at predetermined intervals along the length direction of the tube body 2.
In the water stop part at the opening end of the start-up shaft side of the sheath pipe, a first elastically deformable seal that seals between the sheath pipe 1 and the pipe body 2 in a liquid-tight manner when inserting the pipe body. The seal 3 and the second seal 4 are provided at a distance from each other from the proximal end side to the distal end side of the tube body 2. In FIG. 1, the left side is the proximal end side of the tube body 2, and the right side is the distal end side of the tube body 2. These seals 3 and 4 will be described in detail later.

  A sheath tube connection flange 6 is attached to the opening end of the sheath tube 1 on the start shaft side in a state of being liquid-tightly held with respect to the sheath tube 1. FIG. 3 is a front view of the sheath tube connection flange, and FIG. 4 is a side view of the sheath tube connection flange. As shown in these drawings, the sheath tube connection flange 6 is disposed on the sheath tube side, is substantially the same diameter as the sheath tube 1, has a substantially semicircular shape in which the upper part is notched and the center part is notched. A water stop main body side connection plate portion 8 disposed on the sheath tube side connection plate portion 7 and the water stop portion main body 10 side, the outer shape of which is the same oval shape as the second seal 4 and the center is cut off, A connecting plate portion 9 having an arcuate cross section disposed between the connecting plate portions 7 and 8 is provided. When the drainage part 9A is provided in the lower part of the connection plate part 9, and liquid accumulates in the space surrounded by the sheath tube side connection plate part 7, the water stop part main body side connection plate part 8 and the connection plate part 9. The liquid can be discharged to the outside through the drainage part 9A.

  The second seal 4 is pressed on the water stop main body side connection plate portion 8 of the sheath pipe connection flange 6, and the upper part of the seal is pressed against one flange 11 of the water stop main body 10 from the side opposite to the sheath pipe 1. Moreover, the lower part of the seal is pressed and fixed by a pressing flange 10 </ b> A that is a separate body from the water stop main body 10.

FIG. 5 is a front view of the second seal 4. As shown in FIG. 5, the second seal 4 is formed in an oval outer shape, and an insertion hole 4 </ b> A for inserting the tube body 2 is formed in the upper center. The second seal 4 is made of an appropriately elastically deformable material such as a rubber plate. The same applies to the first seal 3 described later.
FIG. 6 is a front view of a holding flange 10 </ b> A that holds down the second seal 4. As shown in FIG. 6, the holding flange 10 </ b> A covers a portion (a portion that does not overlap) that cannot be pressed by the flange 11 of the water stop main body 10 in the water stop main body side connection plate portion 8. The upper half is cut out.
That is, the outer periphery of the second seal 4 is pressed by the seal presses of the cooperating flange 11 and the pressing flange 10A, and is sandwiched between the sheath tube connection flange 6 and the water stop main body 10. Fixed.

  FIG. 7 is a front view of the water stop body 10, and FIG. 8 is a side view of the water stop body 10. As shown in these drawings, the water stop main body 10 is disposed on the sheath tube connection flange 6 side, and has a ring-shaped flange 11 having a diameter slightly larger than the outer shape of the spacer 2A, and the sheath tube connection flange 6 side. And a flange 12 having the same shape as the one flange 11 and a connecting plate portion 13 having a ring-shaped cross section in which both the flanges 11 and 12 are arranged. The connecting plate portion 13 is provided with a drainage portion 13A. When the liquid is accumulated in the space surrounded by the flanges 11 and 12 and the connecting plate portion 13, the liquid can be discharged to the outside through the drainage portion 13A. It has become. In addition, the upper part of the connection board part 13 is open | released.

The first seal 3 is pressed and fixed to the other flange 12 of the water stop main body 10 by a pressing flange 14 from the side opposite to the sheath tube connecting flange 6 (see FIGS. 9 and 10). .
FIG. 9 is a front view of the first seal 3. As shown in FIG. 9, the first seal 3 has a circular outer shape, and an insertion hole 3 </ b> A for inserting the tube body 2 is formed in the upper center.
Here, as shown in FIG. 2, the first seal 3 is arranged inside the sheath tube 1 and at a position shifted from the center of the sheath tube 1 to one side in the left-right direction (leftward in FIG. 2). Has been. On the other hand, the second seal 4 has a region where the first seal 3 exists (as viewed from the left side in FIG. 1) as viewed from the proximal end side of the tube body 2 (the center of the region is indicated by Ca in the figure) and the inside of the sheath tube 1. The outer shape of the tube 2 is made oval so as to cover the region where the tube 2 is present (the center of the region is indicated by Cb) when the tube 2 is drained and the tube 2 is positioned at the lowermost part in the sheath tube 1. (See FIG. 5).
Further, the insertion hole 4 </ b> A of the second seal 4 is formed at the same position as the insertion hole 3 </ b> A of the first seal 3 when viewed from the proximal end side of the tube body 2.

On the outside of the first seal 3, that is, on the base end side of the tube body 2, a tube body positioning jig 15 that supports the lower surface of the tube body 2 so as to be movable and positions the tube body is provided.
FIG. 11 is a front view of the tube positioning jig 15, and FIG. 12 is a side view of the tube positioning jig 15. The tube positioning jig 15 is supported by the flange 12 of the water stop main body 10. The tube positioning jig 15 may be supported by a stay extending from the traveling frame or the sheath tube. As shown in FIGS. 11 and 12, the tube body positioning jig 15 can move the lower surface of the tube body 2 on the support base 17 whose height and inclination can be adjusted by the left and right screw mechanisms 16A and 16B. The lower surface support rollers 18A and 18B to be supported are attached with an inclination angle so that the upper portions approach each other at an appropriate interval.

  Further, outside the first seal 3, a side surface support portion 19 that movably supports the outer surface of the tube body 2 is attached to the flange 12 of the water stop main body 10 at an appropriate interval in the vertical direction. Yes. FIG. 13 is a front view of the side support part 19, and FIG. 14 is a side view of the side support part 19. As shown in these drawings, the side surface support portion 19 has a configuration in which a side surface support roller 21 that movably supports the outer surface of the tube body 2 is supported on a roller support base 20 attached to the flange 12. Yes.

Next, a tube insertion method using the tube insertion device into the sheath tube using the buoyancy of the above configuration will be described.
First, the water stop portions are respectively set at both ends of the sheath tube 1. In the water stop part at the opening end on the start shaft side, as shown in FIGS. 1 and 2, the water stop part provided with the first seal 3 and the second seal 4 is set. Then, the pipe body 2 to be laid is set so as to be inserted through the insertion holes 3A and 4A of the first seal 3 and the second seal 4, respectively. In this state, a liquid such as water is poured into the sheath tube 1 until it reaches a predetermined height.

Then, the tube body 2 is inserted into the sheath tube 1 while the base end side of the tube body 2 is pressed and moved by a tube body moving means (not shown) such as a traveling frame. This operation is sequentially performed until the tip of the tube body 2 reaches the water stop portion on the arrival shaft side while adding the tube body 2.
At this time, since the tube body 2 is supported by utilizing the buoyancy of water in the sheath tube 1, friction between the sheath tube 1 and the tube body 2 is reduced, so that the tube body 2 can be smoothly inserted into the sheath tube 1. Can be inserted.

  Further, when the setting position of the tube body 2 is curved in a plane, the insertion holes 3A and 4A of the first seal 3 and the second seal 4 are shifted in advance to the left from the center of the sheath tube 1 in advance. Since it arrange | positions, it can avoid that a big load is added to the 1st seal | sticker 3 and the 2nd seal | sticker 4 from the pipe body 2 in the case of a pipe body insertion operation | work. Therefore, the first seal 3 and the second seal 4 are not damaged, or an excessive burden is not applied to the tube moving means for pressing and moving the tube 2.

  In addition, in this embodiment, the lower surface of the tubular body 2 to be inserted is supported by the tubular body positioning jig 15 so as to be movable, and the outer surface of the tubular body 2 is supported by the side surface support portion 19 so as to be movable. Therefore, when the tube body 2 is inserted into the sheath tube 1, it is possible to further avoid applying an excessive load to the first seal 3, the second seal 4, and the sheath tube 1.

  When the tube body insertion operation is completed, the tube body positioning jig 15, the side surface support portion 19, the first seal 3, and the water stop portion main body 10 are removed by removing the bolts fixing them. At this time, since the second seal 4 holds the space between the sheath tube 1 and the tube body 2 in a liquid-tight manner, the water in the sheath tube 1 does not leak into the start shaft.

  Next, the water in the sheath tube 1 is drained. At this time, the tube body 2 that has not received buoyancy from water tends to move to the lowermost portion in the sheath tube 1. Here, when the 1st seal | sticker 3 and the water stop part main body 10 are removed previously, and the 2nd seal | sticker 4 is located in the lowest part in the sheath pipe | tube 1 seeing from the base end side of the pipe body 2. Therefore, the second seal 4 does not hinder the movement of the tube body 2 to the lowermost part in the sheath tube 1. That is, the tube body 2 can be smoothly moved to the lowermost portion in the sheath tube 1. At this time, an excessive load is not applied to the second seal 4, and it is possible to avoid a situation in which the second seal 4 is damaged and water leaks into the sheath tube 1 therefrom.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above-described embodiment, the tube body positioning jig 15 and the side surface support portion 19 are provided outside the first seal 3, but the curvature of the planar curve of the tube body 2 to be laid is small, and the tube body insertion work In this case, when the reaction load received by the water stop portion is small, the tube positioning jig 15 and the side surface support portion 19 need not be provided.
Moreover, in the said embodiment, although seeing from the base end side of the pipe body 2, the 1st seal | sticker 3 is shifted to the left from the center of the sheath pipe 1, However, It is not restricted to this, The pipe body 2 to lay If the planar curve bends in the opposite direction, it may be shifted to the right.
In the embodiment, the outer peripheral edge of the first seal 3 is shifted to the left as viewed from the proximal end side of the tube body 2 to the inner surface of the sheath tube 1, but the present invention is not limited to this. The amount may be a smaller value.
Moreover, when the curvature of the tube body 2 is along the vertical direction, the first seal 3 may be shifted in the vertical direction from the center of the sheath tube 1.
Moreover, in the said embodiment, although the 2nd seal | sticker 4 is formed in the ellipse shape, you may form in an ellipse shape, without being restricted to this.

  The present invention relates to a tube insertion device and a tube insertion method for inserting a tube using a buoyancy force into a sheath tube buried in the ground.

DESCRIPTION OF SYMBOLS 1 Sheath pipe 2 Tubing body 2A Spacer 3 1st seal 4 2nd seal 4A Insertion hole 6 Sheath pipe connection flange 10 Water stop body 11 Flange 11 (seal presser)
12 Holding flange (Seal holder)
14 Holding flange (Seal holder)
15 Tube positioning jigs 18A, 18B Lower surface support roller 19 Side surface support portion 21 Side surface support roller

Claims (4)

Tubing into the sheath tube using buoyancy that uses the buoyancy of the liquid stored in the sheath pipe to insert the tubular body into the sheath pipe using water buoyancy provided at both ends of the sheath pipe buried between the starting shaft and the reaching shaft An insertion device,
A first seal and a second seal that are liquid-tightly sealed and elastically deformed between the sheath tube and the tubular body at the water stop portion at the opening end on the start shaft side of the sheath tube, Provided with a space from the proximal end side to the distal end side of the tubular body,
The first seal is disposed inside the sheath tube and at a position shifted from the center of the sheath tube at least in one of the left and right directions, and has a circular outer shape and the tube at the center. An insertion hole is formed through which the body is inserted,
The second seal is formed when a region where the first seal exists and a liquid in the sheath tube are drained when the tube body is positioned at a lowermost portion in the sheath tube as viewed from the proximal end side of the tube body. The outer shape is an ellipse or an ellipse so as to cover the area where
Utilizing buoyancy, wherein the second seal has an insertion hole through which the tubular body is inserted at the same position as the insertion hole of the first seal when viewed from the proximal end side of the tubular body. A device for inserting a tube into a sheath tube. The first seal is pressed and fixed by a seal presser whose outer shape is circular,
The tubular body insertion device using a buoyancy according to claim 1, wherein the second seal is pressed and fixed by a seal presser having an oval or elliptical outer shape.   Outside the first seal, a lower surface support roller for movably supporting the lower surface of the tube body and a side surface support roller for movably supporting the outer surface of the tube body are provided. An apparatus for inserting a tubular body into a sheath tube using buoyancy according to claim 1 or 2. A tube body insertion method into a sheath tube using buoyancy for inserting the tube body into the sheath tube using the tube body insertion device into the sheath tube using buoyancy according to any one of claims 1 to 3. There,
Tube insertion in which the tube is inserted into the sheath tube through the insertion holes of the first seal and the second seal from a position shifted from at least one of the left and right directions from the center of the sheath tube. Process,
After removing the first seal, a draining step of draining the liquid inside the sheath tube;
A tube insertion method into a sheath tube using buoyancy characterized by comprising:

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