JP3840066B2 - Non-flexible multi-strip pipe lump-in method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a multi-strip pipe lump-in method that pulls in a large number of inflexible pipes into the ground from the starting shaft to the reaching shaft, provided on the ground surface at a certain distance. In particular, the present invention relates to a construction method and apparatus capable of laying a curve using a pipe that does not bend.
[0002]
[Prior art]
Conventionally, as shown in FIG. 25, aiming to reduce the cost of pipeline construction that has been laid one by one by a small-diameter propulsion method, as shown in FIG. After passing the rod 4 through the ground from the starting shaft 2 to the reaching shaft 3 provided on the ground surface at a distance, as shown in FIG. A multi-span pipe collective drawing method has been developed in which a hole expanding apparatus (back reamer) 5 and a multi-strip long pipe 6 are bundled and drawn into the ground.
[0003]
[Problems to be solved by the invention]
In this method, the construction of the long tube to be laid can be curved when a flexible tube such as polyethylene is used. However, if the tube is not flexible, that is, if a tube made of inflexible material is used, a short tube should be used. Even if there was, curve construction was not possible. Therefore, in this method, the material of the pipe to be used is limited and can be applied to only a part of the pipes.
[0004]
The present invention has been made in view of these points, and even if the material of the tube is an inflexible tube or a fairly long tube of about 4 m, the curve construction or the laying can be performed. The present invention provides a multi-strip pipe collective pulling method and an apparatus for solving the problems.
[0005]
[Means for Solving the Problems]
In the invention of claim 1, after a rod or wire is passed into the ground from the starting shaft to the reaching shaft, which is provided on the ground surface at a certain distance, the ground is attached to the end of the rod or wire in the reaching shaft. A borehole expansion device (back reamer) and a plurality of unit pipes that are subsequently bundled into multiple units are connected, and the rod or wire is pulled from the start shaft side to reach the start shaft. In the multi-strip pipe lump-in method, which draws a multi-pipe pipe with no flexibility into the ground,
A lead-in wire is connected after the above-mentioned underground hole expanding apparatus, and the joint portion of each pipe of each unit in which a plurality of non-flexible pipes are bundled is locked to the pipe pillow, and the pipe pillow is Insert the lead wire in the center of this tube pillow, and connect each unit tube to the joint of the adjacent unit tube with one end of the other tube. The tube pillow is fixed to the lead-in wire with one end of this tube spaced apart from the back end of the joint portion of the other tube in the axial direction, and the opening of each tube of the unit at the tip is fixed. A non-flexible multi-strip conduit pull-in method is used in which a tapered cap is attached and the rod or wire is pulled.
[0006]
Further, the invention of claim 2 is an apparatus used in the above-mentioned construction method, and each unit in which a drawing wire is connected after the underground hole expanding apparatus and a plurality of inflexible pipes are bundled. The joint of each tube is locked to the tube pillow, and the tube pillow is inserted between multiple tubes to support it. Then, one end of the other pipe is inserted into the joint part of the adjacent unit pipe with play, and one end of this pipe is separated from the inner end of the joint part of the other pipe by a certain length in the axial direction. The tube pillow was fixed to the lead-in wire, and a tapered cap was attached to close the opening of each tube of the tip unit.
[0007]
In this invention of Claim 1 and 2, it can respond to the curve to arbitrary directions by arrange | positioning the drawing wire in the approximate center position of the pipe | tube bundled in multiple strips. In addition, each unit pipe is connected by inserting one end of the other pipe into the joint part of the adjacent unit pipe with play, and one end of this pipe extends in the axial direction from the back end of the joint part of the other pipe. Since the connection is made in a state of being separated by a certain length, it is possible to provide an opening difference between the unit tubes when passing through the curve. Moreover, since the tube pillow is fixed to the drawing wire for each unit, the load acting on the tube at the time of drawing is smaller than that of the propulsion method.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
First, as shown in FIG. 1, as members used in the present invention, a retracting wire 11, a tube pillow 12, a stopper 13, a steel band 14, a tip cap 15 (see FIG. 8), and a spacer 16 (see FIG. 14). There is.
Further, the multi-tube 17 drawn into the ground according to the present invention is composed of a non-flexible PFP tube, and has a socket-like joint portion 17a at one end thereof (see FIG. 4).
The pull-in wire 11 (see FIG. 11) usually has a larger number of strands (steel wires) around the core steel (core), but does not extend greatly with respect to the pull-in load and follows the construction curve. Any suitable material may be used as long as it has sufficient flexibility with respect to the pulling load and has the ability not to break.
[0009]
The tube pillow 12 prevents the movement of each tube 17 by inserting the socket-like joint portion 17a of the tube 17 composed of four PFP tubes, and integrates the four tubes 17 as one unit. It is a device to move. As shown in FIG. 2 and FIG. 3, the specific structure is provided with two substantially rhombic locking plates 12a, 12a having curved edges with each side being spaced apart, and the two The four plates 12b, 12b, 12b, and 12b are arranged so that the central portion is opened between the locking plates 12a and 12a so as to have a cross-shaped cross section. , 12b are provided with curved plates 12c each having a concavely curved cross section. At the center of each locking plate 12a, a hole 12d through which the wire 11 is passed is formed. Steel band fixing members 12e are provided at four locations on the outer surface of one of the locking plates 12a and 12a. The joint portion 17a of the pipe line 17 is configured to fit between the curved edges of the two locking plates 12a and 12a.
[0010]
Further, as shown in FIG. 4, each of the multiple unit pipes 17 is connected to the joint part 17 a of the adjacent unit pipe 17 by inserting one end of the other pipe 17 with play. One end of the other pipe 17 is connected in a state of being spaced apart from the back end portion in the joint portion 17a of the other pipe 17 by a certain length in the axial direction. Further, since a waterproof rubber packing (not shown) is set on the inner periphery of each joint portion 17a, each connected pipe 17 is connected to the outer pipe 17 and the inner side of each unit when passing the curve. As shown in P and Q of FIG. 1, a difference in opening between the tubes 17 can be provided. That is, the butting distance P between the back end portion of the joint portion 17 a of the outer one tube 17 and the end portion of the other tube 17, the back end portion of the joint portion 17 a of the inner one tube 17, and the other pipe line 17. There is a difference in the butting distance Q with the end of the.
[0011]
The stopper 13 is a device for using the tube pillow 12 and the steel band 14 to rotatably attach the bundled tube 17 to the pull-in wire 11 while restraining the back-and-forth movement. It attaches to the drawing wire 11 before and behind the pillow 12. As shown in FIGS. 5 and 6, two clamp pieces 13b, 13b having wire gripping grooves 13a are opposed to each other, and ends of a plurality of bolts 13c passing through both sides of these clamp pieces 13b, 13b. The lead wire 11 is inserted into the wire gripping grooves 13a of the two clamp pieces 13b and 13b, and the nuts 13d are fastened and fixed to the outer periphery of the lead wire 11. .
[0012]
As shown in FIG. 7, the steel band 14 binds the four tubes 17 so that the tube 17 piped to the tube pillow 12 does not come off the tube pillow 12 and moves slightly up and down and left and right. It is a device, and each of the four band irons is processed according to the cross-sectional shape of the tube 17, and each end is applied to the steel band fixing member 12e of the tube pillow 12 and fixed by the fixing bolt 14a. .
[0013]
As shown in FIG. 8, the tip cap 15 is a device attached to the tip of each pipe 17 of the head unit following the back reamer 5, and determines the direction of the pipe line to be drawn. The tip cap 15 must have a function of causing resistance to follow the excavated earth and sand and following the subsequent pipeline along the tunnel line. Specifically, as shown in FIGS. 8 to 10, the drawing wire 11 is passed through the central axis of the cone portion 15 a in a shape in which a substantially cone attached to the drawing wire 11 just behind the back reamer 5 is placed sideways. The four round rod-shaped leg portions 15b are projected from the rear side surface of the conical portion 15a, and an O-ring 15c is provided on the outer periphery of the tip of each leg portion 15b. In addition, this tip cap may be a conical shape that is independent of the front end of each pipe line.
[0014]
This tip cap 15 has each leg portion 15b inserted into the tip of each of the leading four unit tubes 17 and the stopper 13 is fixed to the lead-in wire 11 in front of the tip cap 15 so that the tip cap 15 The forward movement is restricted, and the backward movement is restricted by a stopper 13 fixed to the front and rear drawing wires 11 of the tube pillow 12 that supports the four tubes 17 of the head unit. As shown in FIGS. 8 and 10, the outer diameter of the tip cap 15 and the multiple tubes 17 of each unit is slightly smaller than the outer diameter of the back reamer 5, and the tip cap 15 formed by these is used. And the earth removal path | route is formed in the outer periphery of the outer diameter of the multi-tube 17 of each unit.
[0015]
As shown in FIG. 13, the spacer 16 is installed for the purpose of eliminating the outer peripheral step between the outer periphery of the four unit tubes 17 and the socket-like joint portion 17 a provided at one end of the tube 17. It has a substantially ring shape with an appropriate slope, and has one end abutting against the joint portion 17a and covers the outer periphery of each pipe 17.
[0016]
Next, a description will be given of a batch pull-in method for four tubes using the above apparatus. The pull-in wire 11 is prepared. As shown in FIG. 11, one end of the pull-in wire 11 is compression-stopped, and a pineal tape 18 is wound around the outer periphery of the pull-in wire 11 at a position where the stopper 13 is attached. On the ground, a set of jigs such as the tube pillow 12 and the stopper 13 are set in succession with the tube 17 and the tip cap 15 of the head unit. Then, as shown in FIG. 12, one end of the lead-in wire 11 is attached to the back reamer 5 in the reaching shaft 4 via a shackle 19.
[0017]
Next, a procedure for assembling four pipes 17 as one unit in the reaching shaft 3 will be described. As shown in FIG. 13, first, spacers 16 are attached to appropriate positions on the outer periphery of each tube 17. This is to facilitate the insertion of the pipe 17 into the joint portion 17a of the front pipe 17. Then, as shown in FIG. 14, one end of the lower tube 17 is inserted into the joint portion 17 a of the front tube 17, and the joint portion 17 a portion of the tube 17 is attached to the rear tube pillow 12. Although not shown, the lower tube 17 is set in two strips. Then, the lower steel bands 14 are inserted by lifting the lower tubes 17. Further, as shown in FIG. 15, one end of the upper pipe 17 is inserted into the joint portion 17 a of the front pipe 17, and the joint 17 a portion of the pipe 17 is attached to the rear pipe pillow 12. Although not shown, two upper tubes 17 are also set.
The spacer 16 shown in FIGS. 13 to 15 may have a small width, for example, a welded steel band.
[0018]
And as shown in FIG. 16, each steel band 14 of upper part is covered from on the upper two pipe | tube 17 and each steel band 14's end part is match | combined, and each steel of the tube pillow 12 is fixed with the fixing bolt 14a. It fixes to the made band fixing member 12e. After setting these one unit pipes 17, it is confirmed by a mark attached to each pipe 17 whether the distance from the front pipe 17 is as specified. Then, as shown in FIG. 17, each spacer 16 is shifted to the position of the steel band 14, and the level | step difference of the coupling part 17a is eliminated.
[0019]
In this way, when the assembly of one unit of the pipe and the connection of the subsequent units are finished in the reach shaft 3, these pipe lines are drawn into the ground. As in the conventional example shown in FIG. 26, the rod 4 is pulled to the start shaft 2 side using the drilling machine 1 and the back reamer 5 is rotated while being pulled to excavate a natural ground, and at the same time, the pipe Pull the road. At that time, the earth and sand excavated by the back reamer 5 or the like is discharged into the start shaft 2 or the arrival shaft 3 so that the upper end 20 of the tunnel opening is always hidden by the discharged earth as shown in FIG. The earth and sand in the reach shaft 3 is adjusted. Thereby, the tunnel hole wall can be held. The amount of discharged earth and sand in the reach shaft 3 is adjusted by sucking it up to a steel earth and sand tank 22 on the ground with a vacuum 21. The same applies to the start shaft 2. Further, as shown in FIG. 18, if a slope is provided on the bottom surface of the reaching shaft 3, each unit pipe can be easily connected.
[0020]
Further, as shown in FIG. 19, when the unit of the top pipe 17 reaches the start shaft 2, the back reamer 5 and the tip cap 15 are removed in this order. Before the start shaft 2 and the reaching shaft 3 are backfilled, a ready-made closing cap (not shown) is attached to the end of the pipe line exposed in the shafts.
The PFP pipes described above are commercially available as POLYCON FRP pipes, and there are 1 m, 2 m, and 4 m types, and there are various diameters of 100 to 300 mm. In the present invention, as a result of experiments on pipes having a length of 1 to 4 m and pipes having various diameters, there was no problem in pulling in any case.
[0021]
In the embodiment described above, the number of pipes to be laid is four, but the present invention is not limited to this, and can be used for collective pulling of other number of pipes as shown in FIGS. That is, FIG. 20 shows the case of 3 items, FIG. 21 shows the case of 4 items, FIG. 22 shows the case of 5 items, FIG. 23 shows the case of 6 items, and FIG. In the case of the above-mentioned 3 thru | or 6 th article, tube pillow 12 'is located in the center of each tube 17 of many stripes, and passes one lead wire 11 in the center part of this tube pillow 12'. Further, in the case of Article 9 in FIG. 24, the tubes are arranged in three rows and columns, and a tube pillow 12 'is provided between them, and four lead wires 11 are provided at four locations in the center of the tube pillow 12'. Pass through. By these, it has arrange | positioned in the approximate center position of the pipe | tube which bundled the drawing wire in many strips, and can respond to the curve to arbitrary directions.
[0022]
【The invention's effect】
According to the first and second aspects of the present invention, the lead-in wire is arranged at a substantially central position of the tube bundled in multiple lines, so that it can cope with a curve in an arbitrary direction. In addition, each unit pipe is connected by inserting one end of the other pipe into the joint part of the adjacent unit pipe with play, and one end of this pipe extends in the axial direction from the back end of the joint part of the other pipe. Since they are connected with a certain distance apart, it is possible to provide a difference in opening between each unit pipe when passing through the curve, and it is possible to construct a curve when embedding a long pipe as long as 4 meters without flexibility. . In addition, since it is possible to construct a curved line in the longitudinal direction, it is possible to fill mud in the excavated portion over the entire route line, and the pipe line can be drawn with a small force by the action of buoyancy. Further, since the tube pillow is fixed to the pull-in wire for each unit, the load acting on the pipe line at the time of pull-in is smaller than that of the propulsion method, and the work period can be shortened and the cost can be reduced.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram showing a drawing-in state of a pipeline at the time of curve construction according to an embodiment of the present invention.
FIG. 2 is a side view of a tube pillow used in the embodiment of the present invention.
3 is a longitudinal sectional view of a tube pillow used in the embodiment of the present invention, and is a sectional view taken along line AA in FIG.
FIG. 4 is an explanatory sectional view showing a connection state of adjacent pipes used in the embodiment of the present invention.
FIG. 5 is a side view of a stopper used in the embodiment of the present invention.
FIG. 6 is a front view of a stopper used in the embodiment of the present invention.
FIG. 7 is an explanatory view showing a usage state of a steel band according to an embodiment of the present invention.
FIG. 8 is a side view showing a use state of the tip cap according to the embodiment of the present invention.
9 is a front view of a tip cap according to an embodiment of the present invention, and is a cross-sectional view taken along line BB in FIG.
10 is a rear view of the tip cap according to the embodiment of the present invention, and is a cross-sectional view taken along the line CC of FIG. 8. FIG.
FIG. 11 is a partial side view of the lead-in wire used in the embodiment of the present invention.
FIG. 12 is a side view showing the connection state of the front end portion of the leading pipe used in the embodiment of the present invention.
FIG. 13 is a side view showing a state in which a spacer is attached to a pipe used in the embodiment of the present invention.
FIG. 14 is a side view showing a state in which one end of the lower tube is attached to the front tube of the embodiment of the present invention, and the joint portion at the other end is attached to the rear tube pillow.
FIG. 15 is a side view showing a state in which one end of the upper tube is attached to the front tube of the embodiment of the present invention, and the joint portion at the other end is attached to the rear tube pillow.
FIG. 16 is a side view showing a state in which the upper tube is attached to the front tube and the rear tube pillow according to the embodiment of the present invention, and the steel band is attached.
FIG. 17 is a side view showing a state in which the upper tube is attached to the front tube and the rear tube pillow according to the embodiment of the present invention, and the spacer is attached.
FIG. 18 is an explanatory view showing a state in the vicinity of the reaching shaft in the construction method according to the embodiment of the present invention.
FIG. 19 is an explanatory view showing a state in the vicinity of the start shaft in the construction method according to the embodiment of the present invention.
FIG. 20 is an explanatory diagram showing the attachment of each of the three tubes used in the embodiment of the present invention to the tube pillow and the insertion state of the lead-in wire.
FIG. 21 is an explanatory diagram showing the attachment of each of the four tubes used in the embodiment of the present invention to the tube pillow and the insertion state of the lead-in wire.
FIG. 22 is an explanatory diagram showing the attachment of the five tubes used in the embodiment of the present invention to the tube pillow and the insertion state of the lead-in wire.
FIG. 23 is an explanatory diagram showing the attachment of each of the six tubes used in the embodiment of the present invention to the tube pillow and the insertion state of the lead-in wire.
FIG. 24 is an explanatory diagram showing the attachment of each of the nine tubes used in the embodiment of the present invention to the tube pillow and the insertion state of the lead-in wire.
FIG. 25 is a schematic view showing a first step of a conventional multi-strip pipe simultaneous simultaneous pulling method.
FIG. 26 is a schematic view showing a second step of a conventional multi-strip duct simultaneous pull-in method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drilling machine 2 Starting shaft 3 Reaching shaft 4 Rod 5 Back reamer 6 Short pipe 11 Pull-in wire 12 Pipe pillow 13 Stopper 14 Steel band 15 Tip cap 16 Spacer 17 Pipe 17a Joint part

Claims (2)

After passing a rod or wire into the ground from the starting shaft to the reaching shaft, which is provided on the ground surface at a certain distance, a hole expansion device (back reamer) is attached to the end of the rod or wire in the reaching shaft. ) And a plurality of unit pipes that are bundled together as a single unit by bundling inflexible multi-strip pipes, and then pulling the rod or wire from the start shaft side and pulling the rod or wire from the start shaft to the start shaft In the multi-multiple pipe lump-in method with no flexibility,
A lead-in wire is connected after the above-mentioned underground hole expanding apparatus, and the joint portion of each pipe of each unit in which a plurality of non-flexible pipes are bundled is locked to the pipe pillow, and the pipe pillow is Insert the lead wire in the center of this tube pillow, and connect each unit tube to the joint of the adjacent unit tube with one end of the other tube. The tube pillow is fixed to the lead-in wire with one end of this tube spaced apart from the back end of the joint portion of the other tube in the axial direction, and the opening of each tube of the unit at the tip is fixed. A non-flexible multi-strip line collective pulling method characterized by attaching a tapered cap to close and pulling the rod or wire. A plurality of units in which a plurality of non-flexible tubes are bundled and connected behind an underground hole expanding apparatus connected to an end of a rod or wire, and the bundled tubes are set as one unit. In a multi-strip multiple line lump-in device with no flexibility and connected pipes,
A lead-in wire is connected after the above-mentioned underground hole expanding apparatus, and the joint portion of each pipe of each unit in which a plurality of non-flexible pipes are bundled is locked to the pipe pillow, and the pipe pillow is Insert the lead wire in the center of this tube pillow, and connect each unit tube to the joint of the adjacent unit tube with one end of the other tube. The tube pillow is fixed to the lead-in wire with one end of this tube spaced apart from the back end of the joint portion of the other tube in the axial direction, and the opening of each tube of the unit at the tip is fixed. A non-flexible multi-strip conduit collective pulling device characterized in that a tapered cap is attached.

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