JP2000291827A - Mechanism and device for inserting tubular body in sheath pipe making use of buoyancy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism to insert a tubular body with a spacer fitted thereto into a sheath pipe embedded between shafts with a small insertion force, and a simple device to insert the tubular body. SOLUTION: When a cut-off part is provided on both ends of a sheath pipe 3 embedded between shafts 1, 2, and a tubular body 4 is inserted in the sheath pipe 3 making use of the buoyancy of a liquid 5 stored in the sheath pipe 3, a cut-off part comprising elastically deformable seal members A, B fitted with an interval is provided to an opening end of the sheath pipe on a starting shaft 1 side, and a water discharging mechanism is provided between the seal members A, B. A tubular body clamp 18 to hold the tubular body 4 is fixed to a traveling frame 17 traveling on a rail 16, a reaction box 19 to fix/release the rail 16 is connected to the traveling frame through an expansion device 20, and the tubular body 4 is inserted in the sheath pipe 3 through the inching motion by the expansion of the expansion device and the fixing/releasing operation of the reaction box.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism and a device for inserting a tubular body into a sheath tube buried underground by utilizing buoyancy. Here, the sheath tube includes an outer tube provided outside the tube for preventing damage to the anticorrosion coating when the tube is installed and protecting the tube after the installation, as well as an aging existing tube.

[0002]

2. Description of the Related Art To insert a tube into a sheath tube, there is a method of pushing or pulling the tube directly into the sheath tube or by using a roller, but it is performed by utilizing the buoyancy of a liquid injected into the sheath tube. This has the advantage that the insertion force can be reduced. As a conventional means for inserting a tubular body into a sheath tube using buoyancy, there is a "method of inserting a main tube into a sheath tube underground" in Japanese Patent Application Laid-Open No. 7-190248.

In this method, as shown in FIG. 6, when a main pipe 32 (corresponding to a pipe body of the present invention) is inserted into a sheath pipe 31 buried between both shafts, the sheath pipe 31 on the side of the reaching shaft 33 is inserted. Blind open end
A sealed state is established with 37, water 36 reaching a predetermined water level is supplied into a sheath tube 31 that is shut off by a packing material 35 (seal material) provided at an opening end on the starting shaft 34 side, and the main pipe 32 is converted into water 36. This is a method of inserting the main pipe 32 into the sheath pipe 31 while adjusting the height position of the main pipe 32 by adjusting the water level while floating.

[0004] An insertion device for inserting a tube into a sheath tube uses a wire rope attached to the distal end of the tube, pulls in with a winch installed in an arrival shaft, and is fixed to a reaction force body installed in a starting shaft. This method uses a propulsion device and a tube clamp to push it into a scale. As shown in FIG. 7, the push-in method includes a clamp 42 for gripping a tube 41, a reaction force base 43 for taking a reaction force, and a cylinder mechanism 44 capable of extending and contracting the clamp 42 and the reaction force base 43, It is known that the tube 41 is inserted into the sheath tube in a tapered shape by the clamping operation of the tube 41 and the extension and contraction operations of the cylinder mechanism 44.

[0005]

Generally, since the anticorrosive material such as a synthetic resin is coated on the tube, it is necessary to prevent the coating from being damaged when the tube is inserted into the sheath tube. In order to obtain an appropriate gap when filling the gap between the sheath tube and the tube after insertion with the grout material, spacers are attached to the outer surface of the tube at appropriate intervals. As the spacer, as shown in FIG. 3, a spacer made of plastic and formed in an uneven shape is attached to a pipe using bolts.

The method of inserting a tube into a sheath tube according to the prior art described above does not have much problem with a straight tube, but the tube with a spacer has the following problems to be solved. When inserting the tube with the spacer into the sheath tube,
Since the spacer portion spreads the waterproof packing material, the waterproofness is impaired, and there is a problem that the liquid in the sheath tube leaks into the starting shaft.

In the prior art, the level of the liquid in the sheath tube, which changes with the insertion of the tube, is adjusted by the valve of the drain pipe. Therefore, during the construction, the liquid level in the sheath tube is monitored and the valve is adjusted. Was necessary and complicated. In addition, in the insertion device for inserting the tube into the sheath tube, in the conventional pushing device, except for a large device having an insertion mechanism longer than the length of the tube, two clamp mechanisms are provided to insert the tube while holding the tube. Or, in order to support the tube at the time of unclamping, a large-scale tube support mechanism was required to enable the spacer to be dodged when passing through the spacer.

The present invention provides a sealing mechanism for inserting a tube into a sheath tube without leaking the liquid stored in the sheath tube into the starting shaft when inserting the tube with the spacer into the sheath tube. The purpose of the present invention is to provide a mechanism for easily and automatically maintaining the liquid level at a height that imparts appropriate buoyancy to the tube and an insertion device for easily inserting the tube with the spacer into the sheath tube. It is.

[0009]

The gist of the mechanism and apparatus for inserting a tubular body into a sheath tube utilizing buoyancy according to the present invention is as follows. A water stop section is provided on both sides of the sheath tube buried between the start shaft and the arrival shaft, and a hollow tube is inserted into the sheath tube using the buoyancy of the liquid stored in the sheath tube. At the open end of the sheath tube, there is provided a water-stop portion comprising an elastically deformable annular or U-shaped seal member A and a seal member B attached at an interval wider than the width of the spacer attached to the tube, and the seal is provided. This is a mechanism for inserting a pipe into a sheath tube using buoyancy, wherein a drainage device is provided between a material A and a sealing material B. In addition, a liquid tank that overflows at a predetermined water level is provided at the water stop portion at the end of the sheath pipe of the reaching shaft so that the liquid level stored in the sheath pipe always becomes an appropriate liquid level, and the liquid in the sheath pipe is provided. The position may be automatically adjustable.

[0010] A tube clamp for holding a tube with a spacer to be inserted into a sheath tube storing the liquid is fixed to a traveling frame installed on a rail installed in the starting shaft, and the rail is attached to the traveling frame. A reaction force box provided with a rail clamp for fixing and releasing is connected via a telescopic device, and a tube gripped by a tube clamp fixed to a traveling gantry is operated by the telescopic operation of the telescopic device and the reaction force box. This is a tube insertion device that inserts a tube into a sheath tube, which is configured to be measured and moved by a rail fixing / releasing operation.

[0011]

According to the present invention, the tubular body insertion mechanism utilizing the buoyancy of the tubular body is provided at the opening end of the sheath pipe on the starting shaft side at an interval wider than the width of the spacer attached to the tubular body. Since the water-stop portion made of the U-shaped seal material A and the seal material B is provided, when a deformed member such as a spacer provided on the outer periphery of the tube passes through the water stop portion of the sheath tube, FIG. (a) to (d)
The buoyancy liquid 5 stored in the sheath tube 3 by acting as shown in FIG.
Does not leak into the starting shaft. That is, when the spacer 7 passes through the water stopping portion when the tube 4 is inserted, first, the sealing material A is pushed and spread (FIG. 2, a), and the spacer 7 is
, And is located between the seal material A and the seal material B, the seal material B is in a water stop state (b). Next, when the spacer 7 passes through the sealing material B, the liquid 5 in the sheath tube 3 flows out to spread out the sealing material B, but does not leak into the starting shaft because the sealing material A is still water. It stays between the sealing material B (c). Next, after the spacer 7 has passed through the sealing material B, the sealing material B is in a water-stop state. In this state, the liquid 5 collected between the sealing materials A and B
Open 0 and discharge (d).

If a liquid tank is provided at the water stop portion at the end of the sheath pipe of the reaching shaft so as to overflow at a predetermined water level, even if the liquid level in the sheath pipe is going to rise due to the insertion of the pipe body, the overflow occurs. Thus, the liquid level in the sheath tube can always be automatically adjusted to and maintained at a predetermined height that gives an appropriate buoyancy to the tube.
Further, the pipe insertion device is a device in which a clamp for holding the pipe is fixed to a traveling base that measures and moves on a rail,
By clamping the rear part of the tube with the spacer from the rear end spacer, the spacer does not pass through the clamp part, and it is not necessary to change the holder during insertion work, so a mechanism to dodge the spacer is unnecessary, and a long stroke A simple insertion device that does not require an insertion mechanism and does not require a mechanism for holding the tube body.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a longitudinal sectional side view showing an embodiment of an apparatus for inserting a pipe body into a sheath pipe utilizing buoyancy according to the present invention, wherein a steel pipe or fume buried underground from a starting shaft 1 to a reaching shaft 2 is shown. A water stop section is provided at both ends of the sheath pipe 3 such as a pipe, and a liquid 5 at a liquid level that gives an appropriate buoyancy to the pipe body 4 is stored in the sheath pipe 3, and a tip is provided from the starting shaft 1 side. A tube 4 with a spacer, such as a hollow gas pipe or a water pipe, is inserted and the buoyancy of the liquid in the sheath 3 is used to reduce the insertion force, and the tube 4 is inserted into the sheath 3. Things.

As the buoyancy liquid 5 stored in the sheath tube 3, water, seawater, muddy water or the like is used. FIGS. 2A to 2D
Shows an example of a tube 4 with a spacer to which the present invention is applied. As shown in a side view in FIG. 2 and a perspective view in FIG. 3, the spacer 7 projects from the outer surface of the tube at a height of about 5 cm and a width of about 3 cm.
0 to 3 cm plastic molded products are mainly used
The bolts 8 are attached to the tube 4 every m. As shown in FIGS. 1 and 2, the water shut-off portion of the sheath tube 3 on the starting shaft 1 side includes a ring-shaped sealing material A and a sealing material B inside the end portion of the sheath tube 3 in the axial direction of the tube more than the width of the spacer 7. Are provided at intervals. The material of the sealing materials A and B used in the present invention is made of a rubber or a synthetic resin plate or a hollow tube.
After the sealing materials A and B have passed through the spacer 7 of the tube 4,
It is necessary to make it elastically deformable to a height higher than the projecting height of the tube so that the tube can be restored and the outer surface of the tube can be pressed. If the sealing material is made too high in elasticity (hard), the resistance at the time of insertion increases, so that it is possible to secure the water-stopping property, and it is better to make the sealing material as low as possible (soft).

In the lower portion between the seal material A and the seal material B, when the spacer portion 7 of the tube 4 passes through the seal material B,
After storing the liquid flowing out from the inside, a drain hole 9 for draining is provided, and a hose 11 is attached via a valve 10. In addition, it is also possible to use a drainage pump instead of a drainage port, a valve, and a hose. At the pipe end of the sheath tube 3 on the arrival shaft 2 side, a water stop section is provided by a blind cover 12, and this blind cover 12
The lower part of the pipe is connected to an injection / drainage pipe 13 communicating with the inside of the sheath pipe 3. This injection / drainage pipe is connected to a liquid tank 15 mounted on the gantry 14, and the liquid tank 15 overflows when the liquid level reaches a certain level or higher, and the liquid 5 flows out to the outside. When the gantry 14 on which the liquid tank 15 is mounted is made movable up and down, it becomes easy to set the height of the liquid level.

Even if the liquid level in the sheath tube 3 rises due to the insertion of the tube 4 by the liquid tank 15, the liquid level in the sheath tube 3 overflows at a set height, and the liquid level in the sheath tube 3 is always automatically adjusted to a predetermined height. The tube 4 can be provided with an appropriate buoyancy to hold it. As shown in FIG. 4, a liquid tank 15 may be provided directly on the blind lid 12 of the sheath tube 3, and a drain hole 15a may be opened at a predetermined liquid level of the blind lid 12 to overflow. The liquid level to be overflowed depends on the dimensions of the tube 4 and the liquid 5 to be used.
The insertion force can be minimized if the buoyancy at which the weight of the hollow tube is zero is obtained, but the buoyancy is not necessarily reduced to the point at which the weight of the hollow tube becomes zero. There may be slight excess or deficiency in buoyancy.

As shown in FIG. 1, the pipe insertion device is a known pipe clamp which holds the pipe 4 on an upper part of a traveling gantry 17 which runs on a rail 16 laid on the starting shaft 1 in the pipe axis direction. 18
A reaction box 19 having a rail as shown in FIG. 5 and a rail clamp capable of being fixed and opened is connected to a front portion of the traveling mount via a telescopic device 20 such as a hydraulic cylinder.

FIG. 5 shows an example of a rail clamp, in which the rail 16 and the reaction force box 19 are fixed by sandwiching the side of the rail 16 with a jack 21 attached to a member fixed to the reaction force box 19. It can be opened. By using a cam or a ratchet mechanism for the rail clamp, the operation of fixing and releasing the rail clamp can be simplified.

In this insertion device, the rail clamp 21 of the reaction box 19 is operated and fixed to the rail 16 with the pipe clamp 18 holding the outer circumference of the pipe near the rear end of the pipe 4 without the spacer 7. The telescopic device 20 is contracted and the rail
The traveling base 17 on the 16 is moved, and the tube 4 gripped by the tube clamp 18 is inserted into the sheath tube 3. When the telescopic device 20 has moved by one stroke, the rail clamp 21 is opened, the telescopic device 20 is extended, and the reaction force box 19 is moved forward. Then, the same operation as described above is repeated to measure and move, and the pipe 4 is sheathed. Insert into tube 3. It is preferable to provide a brake mechanism so that the traveling platform 17 does not move when moving the reaction force box 19 forward.

Since the insertion device does not change the gripping state of the tube clamp 18 during the measuring movement, there is no interference of the spacer portion 7 of the tube.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of a tube insertion mechanism and an insertion device utilizing buoyancy according to the present invention will be described below with reference to FIG. The sheath tube 3 is buried at a depth of 8 m underground between the starting shaft 1 and the reaching shaft 2 by a well-known propulsion method with a fume tube having an inner diameter of 1200 mm and an outer shape of 1400 mm. The tube 4 inserted into the sheath tube 3 is an outer diameter of 610 mm, a steel tube having a plate thickness of 15.1 mm, and the outer surface is coated with anticorrosion, and the height from the outer surface of the tube every 6 m is 50 mm,
A 300 mm wide plastic spacer 7 is attached.

The water-stop portion provided inside the end of the sheathing tube 3 on the side of the starting shaft 1 has a sealing material A and a sealing material B which are spacers.
It is provided at an interval of 500 mm wider than 7 widths. The annular sealing members A and B are made of an annular rubber plate having a thickness of 10 mm, and the width thereof is wider than the gap between the sheath tube 3 and the tube 4.
The inner peripheral end is bent to the outer peripheral surface of the tube 4 in the tube insertion direction and is elastically pressed against and slidable, and has a deformability through which the spacer 7 of the tube 4 can pass. . A drain hole 9 having a diameter of about 40 mm is formed at the bottom of the sheath tube 3 between the seal material A and the seal material B, and a hose 11 is attached via a valve 10. A liquid tank 15 mounted on a gantry 14
Is connected to a water supply / drain hole at the end of the sheath tube by a hose 13, so that the inside of the liquid tank 15 overflows at a predetermined height.

In this embodiment, water is used as the buoyancy liquid 5, and the liquid level at which the weight of the water becomes zero is about 130 mm above the center of the tube 4 from the specifications of the tube 4, Pipe
In order to align the center of 4 with the center of the sheath tube 3, it overflows at a liquid level of about 730 mm from the inner wall of the lower portion of the sheath tube 3. The tube insertion device is a rail 1 installed on the starting shaft 1.
6 A traveling device with a brake is set on 6, and a known tube clamp that can tighten and release the outer periphery of the tube on this traveling device
18 is fixed. The tube clamp 18 has a sheath tube at the center
The height matches the center of 3 and is inserted. Since the tube clamp 18 only needs to grip the outer peripheral surface of the tube other than the spacer 7, the gap at the time of opening the clamp can be reduced. It is also possible to lower the liquid level in order to reduce the amount of the liquid 5 to be used, and adjust the height of the hole through which the pipes 4 of the sealing materials A and B pass and the height of the pipe clamp 18 to the liquid level. .

Reaction box 19 with rail clamp 18
And the traveling gantry 17 are connected by a telescopic device 20 such as a hydraulic jack. In the present invention, since the insertion force of the tube body 4 is reduced by using the buoyancy, the expansion and contraction device 20 having a small load can be used. According to the above embodiment, a pipe having an outer diameter of 610 mm and a length of 6 m can be efficiently worked in a sheath pipe having an inner diameter of 1200 mm with an extremely small pipe insertion force (about 300 kg).
The liquid 5 in the sheath tube 3 did not leak.

[0025]

As described above, according to the present invention, the insertion force can be reduced because the tube body is inserted into the sheath tube storing the liquid by utilizing the buoyancy, so that the insertion device with a small load can be used. The scale can be simplified and work can be performed efficiently. At the opening end of the sheath tube on the starting shaft side, an elastically deformable annular or U-shaped member is provided at an interval wider than the width of the spacer attached to the tube.
A water-stop portion made of a seal material A and a seal material B in the shape of
Since a drainage device is provided between the seal material A and the seal material B, even when a deformed member such as a spacer provided on the outer periphery of the pipe passes through the water stop portion, the liquid for buoyancy stored in the sheath tube is used. Can be inserted without leaking into the starting shaft. Furthermore, if a liquid tank that overflows at a predetermined water level is provided at the water stop portion at the end of the sheath pipe of the arrival shaft, even if the liquid level in the sheath pipe is going to rise due to the insertion of the pipe body, it always overflows. The liquid level in the sheath tube can be automatically adjusted and maintained at a predetermined height that gives an appropriate buoyancy to the tube. In addition, according to the pipe insertion device of the present invention, the spacer does not pass through the clamp portion, and since it is not necessary to change the holding during the insertion work, a mechanism for dodging the spacer is unnecessary,
A simple insertion device that does not require a long stroke insertion mechanism and does not require a mechanism for holding the tube body.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an embodiment of a tube insertion mechanism / device utilizing buoyancy according to the present invention.

FIGS. 2 (a) to 2 (d) are process diagrams showing a state of insertion of a pipe in a start-side water stop portion.

FIG. 3 is a perspective view of an example of a spacer.

FIG. 4 is a vertical sectional side view of an embodiment of an overflow liquid tank.

FIG. 5 is a vertical sectional side view of the embodiment of the rail clamp.

FIG. 6 is a longitudinal side view for explaining a method of inserting a tubular body into a sheath tube using buoyancy as a first conventional example.

FIG. 7 is a side view showing an example of a tube insertion device into a sheath tube as a second conventional example.

[Explanation of symbols]

 A Sealing material B Sealing material 1 Starting shaft 2 Arriving shaft 3 Sheath tube 4 Tube 5 Liquid 7 Spacer 8 Bolt 9 Drain port 10 Valve 11 Hose 12 Blind lid 13 Note Drain pipe 14 Mount 15 Liquid tank 16 Rail 17 Travel mount 18 Clamp 19 Reaction force box 20 Telescopic device 21 Rail clamp 31 Sheath tube 32 Main tube 33 Reaching shaft 34 Starting shaft 35 Packing material 36 Water 37 Blind lid 41 Tube 42 Clamp 43 Reaction force base 44 Cylinder mechanism

Claims (3)

[Claims] 1. A method of providing a water blocking portion on both sides of a sheath tube buried between a start shaft and a reaching shaft, and inserting a hollow tubular body into the sheath tube by utilizing the buoyancy of a liquid stored in the sheath tube. At the opening end of the sheath tube on the starting shaft side, there is provided a water stop portion comprising an elastically deformable annular or U-shaped seal material A and a seal material B which are attached at an interval wider than the width of the spacer attached to the tube. And a mechanism for inserting a pipe into a sheath pipe utilizing buoyancy, wherein a drainage device is provided between the seal material A and the seal material B. 2. A liquid tank which overflows at a predetermined water level at a water stop portion at an end portion of a sheath pipe of an arrival shaft, wherein a liquid level in the sheath pipe can be automatically adjusted. A tube insertion mechanism into the sheath tube using the buoyancy of the tube. 3. A tube clamp for holding a tube with a spacer to be inserted into a sheath tube storing liquid is fixed to a traveling stand running on a rail installed in a starting shaft, and the traveling stand is provided with a rail. A reaction force box provided with a rail clamp for fixing and releasing is connected via a telescopic device, and a tube gripped by a tube clamp fixed to a traveling gantry is operated by the telescopic operation of the telescopic device and the reaction force box. An apparatus for inserting a tube into a sheath tube utilizing buoyancy, wherein the tube is inserted into the sheath tube by being measured and moved by a rail fixing / releasing operation.