JP2003314192A - Pipe member embedding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe member embedding method which is for use in excavating a region under a road, a rail road, etc., across the same by curved boring, reams an excavated hole (bored hole) to such an extent that a water service pipe, a gas pipe, a communication cable, etc., are arranged therein, and protects the hole excavated by the curved boring from cave-in due to earth pressure irrespective of before or after reaming. <P>SOLUTION: The pipe member embedding method is comprised of a leading hole excavating step, a shrinking pipe arranging step, and a high-pressure fluid feeding step. In the leading hole excavating step, a curved leading hole (3) is excavated by using a flexible rod (guide rod) (2). In the shrinking pipe arranging step, a hollow pipe member (6) which is expandable and currently assumes a shrinking state is connected to the tip of the flexible rod (2) which is then drawn to a starting side, to thereby insert the hollow pipe member (6) into the leading hole (3). In the high-pressure fluid feeding step, high-pressure fluid (Qh) is fed into the hollow pipe member to inflate the same while earth (G) around the pipe member is compressed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water pipe, a gas pipe,
The present invention relates to an improvement in a method for laying a tubular member such as a buried pipe in which a communication cable or the like is installed in an underground area (underground) such as a road or a railroad.

[0002]

2. Description of the Related Art When extending and installing water pipes, gas pipes, communication cables, etc. across roads, railroads, rivers, etc., it is difficult to restrict traffic on roads or railroads or to block rivers. Is. Therefore, it is necessary to bury tubular members such as water pipes, gas pipes, and buried pipes where communication cables are installed in underground areas (roads, railroads, rivers, etc.) so as to cross roads, railroads, rivers, etc. There is.

In the case of embedding a tubular member so as to cross a road, a railroad, or a river, conventionally, a starting shaft and a reaching shaft are excavated on both sides of the road, the railway, or the river, respectively, and the starting shaft and the reaching shaft are formed. I was excavating a tunnel horizontally so that it could communicate.

However, in urban areas where houses are densely packed,
It is difficult to secure land for excavating the starting shaft and the reaching shaft on both sides of the road, railroad, or river, and especially for the starting shaft, a large shaft is required to put the propulsion unit, and the cost burden and long construction period for that are required. It was a problem.

Here, using a flexible rod,
There is a technique of drilling a curved drill hole, that is, a so-called “curved boring” (or “flexible boring”: in this specification, a noun “curved boring” is used). If such a technique is used, it is possible to excavate in the ground in a curved shape by a flexible guide rod to connect two arbitrary points on the ground. If the curved boring is used, it is not necessary to excavate the starting shaft and the reaching shaft in the difficult land.

As described above, the curved boring is a useful technique, but has the following problems. First, in order to bury gas pipes and water pipes that require larger diameter holes than under normal boring holes under roads,
It is necessary to expand the diameter of the boring hole.

Secondly, the relatively small diameter drilled hole excavated by the curved boring and the relatively large diameter drilled hole thereafter expanded must be held against the collapse of the ground and earth pressure. I have to. Even if a drill hole is excavated by curved boring, earth pressure is constantly generated by passing heavy objects such as vehicles in the underground area under the road and by railway vehicles in the underground area under the railway. This is because there is a high possibility that it will end up. The same is true for the diameter-expanded hole after the diameter of the hole drilled by curved boring has to be maintained against the collapse of the ground and earth pressure.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and excavated by curving boring so as to traverse underground areas such as roads, railways and rivers. At that time, the diameter of the drilling hole (boring hole) can be increased to the extent that water pipes, gas pipes, communication cables, etc. can be arranged, and furthermore, the drilling hole drilled by curved boring is subjected to earth pressure. It is an object of the present invention to provide a method for embedding a tubular member that can protect it from falling.

[0009]

The method of embedding a tubular member according to the present invention uses a flexible rod (guide rod) (2) (a curved portion by a bending boring technique or a free boring technique). And a hollow tubular member (for example, a contracted metal tube, which is inflatable and contracted) at the tip of the flexible rod (2). A contraction tube into which the hollow tubular member (6) is inserted into the guide hole (3) by connecting a long lock bolt (6) (6) and pulling the flexible rod (2) toward the starting side. Arranging step and supplying high-pressure fluid (high-pressure water, high-pressure air, or other pressurized fluid) (Qh) into the hollow tubular member to compress the surrounding soil (G) and the hollow tubular member (6). )
And a step of supplying a high-pressure fluid for inflating.

The method for burying a tubular member according to the present invention is a rod having flexibility when the construction ground (G) is relatively robust and there is little risk of collapse of the expanded leading hole (3). A guide hole excavating step of drilling a guide hole (3) (having a curved portion by a curved boring technique or a free boring technique) using a (guide rod) (2), and a rod having flexibility. (2) an expanding bit (32) connected to the tip of the rod (2) and an inflatable and contracting hollow tubular member (eg, contracted) connected to the expanding bit (32) A metal tube, a long lock bolt, etc.) (6) is pulled to expand the diameter of the guide hole (3) and to insert the hollow tubular member (6) into the expanded guide hole (3). , High pressure fluid (high pressure water, high pressure air, etc.) Pressurized fluid) (Qh) is supplied into the hollow tubular member (6) to expand the hollow tubular member (6) while compressing the surrounding soil (G). (Claim 2).

According to the method for embedding a tubular member of the present invention having such a configuration, the expanded hollow tubular member is expanded to the extent that water pipes, gas pipes, communication cables, etc. can be arranged. Also, even if the drilled hole (leading hole) drilled by curved boring is under the road or under the railway, the expanded hollow tubular member acts in the same way as the reinforcing liner. It can protect from collapse due to earth pressure.

In the method for embedding a tubular member of the present invention described above, especially when a metal tube is used as the hollow tubular member, due to the flexibility of the metal tube (when an obstacle is present or a vertical hole is formed, (If you can only dig one)
This is particularly effective when the radius of curvature of the guide hole path is small.

In the above-mentioned present invention, after the hollow tubular member (6) is expanded, the solidifying material (Cg) is injected into the gap between the hollow tubular member (6) and the ground (G) (so-called "backfill injection"). It is preferable to have a step (d).

Here, the hollow tubular member (6) may be a single member having no joint (claim 4). Of course, the hollow tubular member (6) is constituted by connecting a plurality of members, and may have a step of expanding the joint region (7j) between the unexpanded members after supplying the high-pressure fluid. (Claim 5).

Further, the tubular member burying method of the present invention comprises a step of excavating a guide hole (3) (having a curved portion) using a flexible rod (2), and a flexible hole excavating step. (2) having properties, a cross jet injection means (15) connected to the rod (2), and the cross jet injection means (1)
A hollow tubular member (for example, a PVC pipe) (16) connected to 5) is pulled along the guide hole (3), and a cross jet of solidification material (so-called “cross”) is obtained from the cross jet injection means (15). Jet ") to rotate the jetting means (15) to improve the ground in a region having a diameter larger than that of the guide hole (3) along the guide hole (3) or to stabilize the ground, And a hollow tubular member arranging step of inserting the hollow tubular member (16) into an improved region or a region where the ground is stabilized (Claim 6).

In carrying out such a construction method, it is preferable that the hollow tubular member is configured to be expandable (for example, corrugated or bellows-shaped). This is because it can be easily inserted into the area where the ground has been improved. Further, when the hollow tubular member is inserted into a ground-improved region, the tubular member is filled with a fluid having a large specific gravity, and when the tubular member is inserted into the ground-improved region, it floats from the region. It is preferable to prevent this from happening and facilitate insertion. Further, when the cross jet flow of the solidified material (so-called “cross jet”) is jetted from the cross jet jetting means, it is possible to prevent the air lift or the slurry from jetting to the side where the hollow tubular member is inserted. It is preferable that negative pressure supply means is provided on the side where the flexible rod is inserted to suck the air lift and the generated slurry.

According to the present invention having the above-mentioned structure, the ground-improved or stabilized area protects the hollow tubular member from earth pressure and the like, and prevents the collapse. Also, backfill injection is not required because there is a ground modified or stabilized area.

Here, the cross jet injection means (15J) is
It is preferably connected to the flexible rod (2) through an expanding bit (32A) (claim 7).

If such a configuration is adopted, the diameter expansion bit (32
In (A), while expanding the diameter of the guide hole (3) excavated by the flexible rod (2), the cross jet injection means (15) is provided.
The function of centering the cross jet injection means (15J) with respect to the guide hole 3 is provided when guiding J). The cross jet injection means (15J) is accurately centered with respect to the guide hole 3, and the jet of the solidifying material or the stabilizer (cross jet Js) injected by the cross jet injection means (15J) is set in the radial direction. , It is possible to set so as to collide at a position outside. That is, it is possible to expand the diameter of the guide hole (3) to a larger diameter with a jet of solidifying material or stabilizing material (cross jet Js). Then, if the diameter of the guide hole (3) is enlarged, the hollow tubular member (36) can be inserted more easily.

In carrying out the method for embedding a tubular member according to the present invention, it is preferable that a coiled reinforcing member (6K) is wound around the outer peripheral portion of the hollow tubular member (6). 8).

In the present invention having such a structure, when the hollow tubular member expands, the coil-like reinforcing member wound around the outer peripheral part of the tubular member also expands, and the outer peripheral part of the hollow tubular member expands. Fit in. The coil-shaped reinforcing member fitted to the outer peripheral portion improves the pressure rigidity of the hollow tubular member, and prevents the hollow tubular member from being crushed or dented even if the ground is loosened due to earth pressure or vibration. It

Further, the tubular member burying method of the present invention comprises a step of excavating a guide hole (3) (having a curved portion) using a flexible rod (2) and a contraction in the longitudinal direction. Vibrating means (40) capable of expanding radially outwardly when contracted longitudinally
A hollow tubular member arranging step of arranging the hollow tubular member (46) provided with in the leading hole (3), and contracting in the longitudinal direction while vibrating the hollow tubular member (46) by the vibrating means (40). And a tubular member diameter expanding step of expanding the hollow tubular member (46) outward in the radial direction (claim 9).

According to the present invention having the above-mentioned structure, apparent flexibility is increased by applying vibration to the ground when expanding the diameter of the excavation hole. When the hollow tubular member is formed in a bellows shape and the longitudinal dimension is contracted to increase the radial dimension to expand the diameter,
A vibrating element is provided on the bellows to vibrate the natural ground and facilitate diameter expansion. Moreover, the ground is tightened by filling the voids around the area under the vibration.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show the first embodiment. Crossing facilities R such as roads, railways, rivers, etc.
The method for making a curved excavation of the direct ground board G and burying the metal tube 6A of the hollow tubular member for protecting the water supply, the gas pipe, etc. in the excavation hole is shown.

In FIG. 1, an excavation starting point P1 and a reaching point P2 are provided on the ground GL at an appropriate distance from the facility R, and the bending boring machine 1 is arranged in the vicinity of the starting point P1. The guide hole 2 having flexibility attached to the machine 1 excavates the guide hole 3 that curves from the starting point P1 to the reaching point P2 and curves in the underground direction.
This process is a leading hole excavation process.

Next, as shown in FIG. 2, the metal tube 6 in the contracted state is gripped and connected by the pulling joint 4 provided at the tip portion 2a of the guide rod 2 into the connected state, and the guide hole excavated by the above-mentioned process is conducted. 3 is arranged so as to be pulled in from the reaching point P2 side. Reference numeral s indicates the length of the metal tube 6 alone.

FIGS. 3 and 4 show the metal tube 6 used in the present construction and which is expanded by pressure. Figure 3
2 shows the contracted state of the metal tube 6, which is the shape when the metal tube 6 shown in FIG. 2 is retracted. In the illustrated example, the metal tube 6 having a tube thickness t is bent in a C shape so as to enclose the inner space 6a and contracts to the outer diameter d. Figure 4
Shows a state in which the metal tube 6 is expanded into a cylindrical shape having an inner space 6b and an outer diameter D by the high-pressure fluid supplied to the inner space 6a.

FIG. 5 shows a state in which the contracted metal tube 6 is arranged over the entire length of the guide hole 3.
Reference numeral 10 is a supply device for the high-pressure fluid Qh. The process of FIGS. 2 and 5 is a shrink tube disposing process.

In FIG. 6, the metal tube 6 drawn into the guide hole 3 is expanded by a high-pressure fluid (high-pressure water, high-pressure air, or other pressurized fluid) Qh. By pressurizing the inner space 6a by supplying the high-pressure fluid Qh, the ground G around the outer diameter of the metal tube 6 is compressed and becomes the expanded metal tube 6A. This process is a high pressure fluid supply process.

The metal tube 6A is constructed as described above, and the inside of the metal tube 6A is expanded by the metal tube 6A and the backfill material Cg is solidified. It is protected from the collapse of the soil due to earth pressure and is stable, as is the case with the reinforcement liner. Therefore, a water pipe, a gas pipe, a communication cable, etc. are safely arranged. The first embodiment is particularly effective in the case where the starting shaft and the reaching shaft cannot be excavated due to the existence of obstacles and the radius of curvature of the path is small.

7 to 16 show various modes for expanding the region that does not expand even after the high-pressure fluid is supplied in the above-described first embodiment.

7 to 9 show an example of a method of expanding the connecting portion 7j when the connecting portion 7j which is a joint region of the metal tube 6A is in an unexpanded state.

With reference to FIG. 7, the unexpanded connection portions 7j of the front and rear metal tubes 6A and 6A, which are expanded and expanded in diameter, respectively.
And the packer 14 required for expanding the diameter of the connecting portion 7j. In FIG. 7, the connection end 7a on the left rear part and the connection end 7b on the right front part are connected without expansion. The packer 14 communicated with the pressure supply line 13 is arranged in a reduced state inside the connecting portion 7j formed by the front and rear end portions 7a and 7b.

Referring to FIG. 8, the packer 1 in the contracted state.
4 is applied and expanded to expand the connecting portion 7j and expand its diameter. Due to the expansion and expansion of the diameter of the connecting portion 7j, the front and rear metal tubes 6A and 6A are integrated to prevent intrusion of earth and sand or groundwater from the ground G.

Referring to FIG. 9, the packer 14 expanded as described above is decompressed and reduced to another unexpanded connecting portion 7j.
Move to or withdraw.

10 to 12 show an unexpanded connecting portion 7j which is a joint region between the front and rear expanded metal tubes 6A, 6A.
2 shows another method of expanding the diameter of.

In FIG. 10, the connecting portion 7j formed by the left rear connecting end 7a and the right front connecting end 7b is connected without expansion.

Referring to FIG. 11, the front portion of the connecting end 7a,
In the figure, two packers 15 are arranged on each of the rear portions of the connection ends 7b and are inflated. An airtight chamber 18 is formed inside the connecting portion 7j by disposing and expanding the packer 15 with the connecting portion 7j interposed therebetween. In the airtight chamber 18, a high-pressure supply pipe 17 communicating with an external high-pressure source is provided on one side of the packers 15, 15
Place it through the space.

Then, as shown in FIG. 12, the high-pressure fluid Qj is supplied from the high-pressure supply pipe 17 to the airtight chamber 18 and the connecting portion 7
Expand and expand j. As described above, each connecting portion 7
The airtight chamber 18 is formed by the packer 15 at j, and the high pressure fluid Qj is supplied to expand the diameter of the connecting portion 7j.

FIGS. 13 to 16 show a method of expanding the diameter of the unexpanded connection portion 7j which is a joint region of the front and rear expanded metal tubes 6A, 6A by a mechanical expansion robot.

FIG. 13 shows the front surface of the diameter-expanding robot 20, and FIG. 14 shows the side surface. 13 and 14, in the diameter-expanding robot 20, a plurality of diameter-expanding blades 24 that expand and contract in a radial direction with a stroke r are provided on a drum-shaped main body 21.
Drive wheels 2 mounted via 3 for moving in the front-back direction
A traveling unit 22 having 2a is attached. The main body 21 is connected to an external power source and a control device by a line 20L.

In order to expand the diameter of the unexpanded connection portion 7j by this robot, first, as shown in FIG.
The diameter-expanding robot 20 having the diameter-expanding blades 24 contracted therein is arranged.

Next, as shown in FIG. 16, the expanding blade 24 is expanded by the piston 23 to expand the connecting portion 7j. In this method, since the diameter-expanding robot 20 is self-propelled by the remote control operation and positioned at the connection portion 7j, the work is easy.

17 to 20 show a modification of the above-described first embodiment. In other words, FIGS.
Shows a mode in which the diameter of the metal tube arranged in the guide hole 3 is expanded by a packer.

In FIG. 17, the contracted metal tube 6B shown in FIG. 18 is arranged in the guide hole 3. The metal tube 6B in the contracted state is formed of a plate material having a thickness t1 in a C shape surrounding the void As, and the elongated packer 14 is provided in the void As.
A is included and formed so that the diameter of the packer 14A is expanded by the expansion of the packer 14A.

As shown in FIG. 19, the contracted metal tube 6B arranged over the entire length of the guide hole 3 is expanded and expanded by pressurizing the packer 14 to form the expanded metal tube 6C.

FIG. 20 shows an expanded metal tube 6C.
18 shows that the packer 14A inside the void As in FIG. 18 has expanded and the metal tube 6C has expanded in diameter.

21 to 24 show a method of embedding a metal tube by a single member having no connecting portion in a second embodiment of the present invention. This method has a construction area of 10m
It is suitable for construction of about 20 m, and it is also possible to use a coiled tube-shaped metal tube.

First, in FIG. 21, the excavation starting point P1 and the reaching point P2 of the ground GL, which are appropriately spaced from the facility R, are provided, and the bending boring machine 1 is arranged in the vicinity of the starting point P1. A flexible guide rod 2 attached to the bending boring machine 1 excavates a guide hole 3 that curves from the starting point P1 to the reaching point P2 and curves in the underground direction. This process is a leading hole excavation process.

Next, as shown in FIG. 22, the metal tube 16 is expanded in the leading hole 3 by pressurization to expand its diameter.
Pull in and place. Guide rod 2 from the reaching point P2 side
The metal tube 16 in the connected state is gripped and connected by the towing joint 4 provided at the tip end portion 2a, and is pulled in and inserted into the starting point P1 side.

Then, as shown in FIG. 23, the metal tube 16 in the contracted state is arranged over the entire length of the guide hole 3.
The metal tube 16 may have a coiled tube shape. Reference numeral 10 is a supply device for the high-pressure fluid Qh.

In FIG. 24, the metal tube 16 drawn in the guide hole 3 is expanded by a high pressure fluid (high pressure water, high pressure air, or other pressurized fluid) Qh. By the pressurization by the supply of the high-pressure fluid Qh, the ground G around the outer diameter of the metal tube 16 is compressed and becomes the expanded metal tube 16A.

FIGS. 25 to 28 show a modification of the above-described second embodiment. In such a modification, a metal tube made of a single member having no connecting portion is arranged in the leading hole to form an elongated packer. The diameter is expanded by.

In FIG. 25, a metal tube 16B having a contracted state and containing a slender packer 14A (FIG. 26) is disposed in the guide hole 3 without a connecting portion. The metal tube 16B in the contracted state is formed of a plate material having a thickness t1 in a C-shape surrounding the void As, the elongated packer 14A is included in the void As, and is formed so as to expand in diameter due to the expansion of the packer 14A. There is.

Then, as shown in FIG. 27, the metal tube 16 in the contracted state is arranged over the entire length of the guide hole 3.
B is expanded into a metal tube 16C in a diameter expanded state by pressure expansion to the packer 14A.

FIG. 28 shows the expanded metal tube 16
26C, the packer 14A expanded to fill the inside of the void As in FIG. 26 expands the diameter of the metal tube 16C.

FIGS. 29 to 34 show a third embodiment of the present invention, showing a method of burying a metal tube in a sturdy soil such as the Kanto loam layer which is not likely to collapse. Similar to the first embodiment, through the preparation process, the guide hole 2 having flexibility which is attached to the bending boring machine 1 excavates the guide hole 3 curved from the starting point P1 to the reaching point P2 and curved in the underground direction. This process is the leading hole excavation process.

In FIG. 29, inside the guide hole 3 excavated as described above, the diameter-enlarging bit 32 and the metal tube 2 are provided at the tip.
The guide rod 2 to which 6 is connected is pulled in, and the metal tube 26 in the contracted state is inserted while expanding the diameter of the leading hole 3 to the expanded diameter hole 3C by the expanded diameter bit 32 in the starting point P1 direction. This is the step of inserting the hollow tubular member.

Next, as shown in FIG. 30, the diameter of the leading hole 3 is expanded to the expanded diameter hole 3C, and the metal tube 26 is arranged in the expanded diameter hole 3C. Then, the high-pressure fluid supply device 10 communicating with the metal tube 26 is brought into a state capable of supplying the high-pressure fluid.

Then, in FIG. 31, the metal tube 2
Pressure is applied by the high-pressure fluid over the entire length of 6 to bury the expanded metal tube 26C. This pressurizing work is a high pressure fluid supply process. FIG. 32 shows the metal tube 2 in a contracted state before pressurization by the high pressure fluid.
6 is a cross section of No. 6. Internal space 26a of the metal tube 26
By supplying high-pressure fluid to the metal tube 26
Is expanded radially by being pressed outward in the radial direction. A cross section of the expanded metal tube 26C expanded by the high-pressure fluid is shown in FIG. 32 and 33, the reference numeral 12
Shows a backfill material injection pipe for injecting a backfill material in backfill injection described later.

When backfilling is required, the backfilling material is injected after the completion of the expansion metal tube 26C over the entire length. When the backfill material is injected, for example, as shown in FIG. 34, a reaching point P1 (in FIG. 34, a gap between the expanded metal tube (expanded metal tube) 26C and the expanded guide hole 3C is reached. Backfill material injection tube 1 toward the left side)
While moving 2, the backfill material CG is intermittently injected.

As described above, in a sturdy soil without fear of collapse, the diameter of the leading hole 3 and the contraction state of the metal tube 26 are inserted and arranged over the entire length, and then the diameter of the metal tube 26C is expanded. Thereby, the diameter of the guide hole 3 and the insertion of the metal tube 26 in the contracted state are continuously performed, and the pressurization by the high-pressure fluid is required only once, so that the work is simple and easy.

35 to 38 show a method of embedding a tubular member by expanding the diameter of a guide hole by a cross jet monitor which is a cross jet injection means in a fourth embodiment of the present invention.

First, as shown in FIG. 35, through a preparation step, a flexible guide rod 2 attached to the bending boring machine 1 bends in a subterranean direction from the starting point P1 to the reaching point P2 and bends in the underground direction. To drill. This process is the leading hole excavation process.

In FIG. 36, a guide in which a cross-jet monitor 15 for injecting a cross-jet to the tip to expand the diameter and a flexible tubular member 36 (see FIG. 37) are connected in the guide hole 3 is shown in FIG. Prepare rod 2.

Next, as shown in FIG. 37, the guide rod 2 is pulled into the guide hole 3 to cross the cross jet monitor 1.
While rotating 5, the solid jet cross jet Js is jetted to expand the diameter to the diameter-increasing hole 15a larger than the leading hole 3 to improve the ground G. At the same time, in the improved ground area, the tubular member 36
Pull in. Although not shown, the tubular member 36
It is possible to wind the coil-shaped reinforcing material around and protect the flexible tubular member 36 when an unexpected situation occurs due to the coil-shaped reinforcing material.

Reference numeral 28 is a joint for connecting the cross jet monitor 15 and the tubular member 36, and has a function of transmitting only the axial force to the tubular member 36 without transmitting the rotation of the cross jet monitor 15. Is configured. As the tubular member 36, a member having a shape or a material having a flexibility such that it can be easily pulled into the expanded diameter hole 15a is used.
Further, it is preferable that the tubular member 36 is filled with a material having a specific gravity that prevents the tubular member 36 from floating or swinging due to buoyancy when the tubular member 36 is pulled into the improved ground.

When the diameter of the solidified material jet Js from the monitor 15 is expanded and the ground is improved, the slurry processing device 30 of the negative pressure supply means provided on the side of the starting point P1 through the guide hole 3 in order to eliminate the slurry and the air lift. Negative pressure suction is performed to prevent the slurry and air lift from the reaching point P2 side. The solidified material jet Js constitutes a so-called “cross jet”, and limits the excavation range of the jet Js so that the area where the ground is excavated by the jet Js does not unnecessarily expand.

Here, although it has been described that the solidified material jet is jetted from the monitor 15, instead of the solidified material, a chemical liquid for ground stabilization such as bentonite (ground stabilization liquid: stable material).
You may inject the jet jet of (cross jet).

After the injection of the solidifying material or the stabilizing material is completed,
In FIG. 38, the tubular member 36 is retracted over its entire length. If necessary, the backfill material 37 can be injected.

36 to 38, that is, the leading hole 3
The steps subsequent to the leading hole excavating step (FIG. 35) of drilling the hole correspond to the hollow tubular member arranging step.

In the fourth embodiment, since the tubular member having the retractable flexibility is embedded while the ground is improved by the jetting of the solidified material from the cross jet monitor 15, the construction is easy. Further, since the improved ground is formed outside the tubular member 36, backfilling injection is unnecessary.

39 and 40 show a technique according to a modification of the fourth embodiment, and shows a method of arranging a plurality of tubular members 36 in parallel and burying them at the same time.

The excavation section 11 shown in FIG. 39 includes a rod 2 and
A cross-jet monitor 15 that injects a cross-jet to expand its diameter and a cross-jet monitor 1 via a joint 28A
5 and a joint body 29 that connects the tubular member 36. The joint 28A is the cross jet monitor 1
It is configured to have a function of transmitting only the axial force without transmitting the rotation of 5 to the joint body 29. Joint body 29
Is configured to be pulled by the cross-jet monitor 15 at the front portion and to grip the plurality of flexible tubular members 36 at the rear portion.

FIG. 40 is a view taken in the direction of arrow Z in FIG. 39, rotating the monitor 15 while ejecting the cross jet Js and starting point P1.
By moving in the direction (left side in FIG. 37), the solidified material Cg improves the ground, and in the case of FIG. 39, the six tubular members 36 can be simultaneously drawn. With the above configuration, the hatched portion of the ground G (see FIG. 40) is cut by the drawing of the rod 2 into the hole 3 and the rotation of the cross jet Js of the cross jet monitor 15. In the example shown in FIG. 40, the six tubular members 36 can be drawn into the hatched portion. The hatched portion in FIG. 40 is cut and modified with the solidifying material Cg, and the six tubular members 36 are simultaneously retracted. As a result, a plurality of tubular members 36 can be buried in one leading hole, and the number of construction steps can be shortened.

41 and 42 show a modification of the fourth embodiment. In the step shown in FIG. 37 in the fourth embodiment, the diameter of the guide hole 3 is expanded by the jet jet (cross jet) of the solidifying material or the stabilizing material.
In the technique shown in FIG. 2, the diameter is enlarged so that the diameter becomes much larger than that shown in FIG.

In particular, as clearly shown in FIG. 42, the rod 2 is connected with a diameter expansion bit 32A, and the diameter expansion bit 32A is connected with a cross jet monitor 15J. Then, the jet (cross jet) Js of the solidifying material or the stabilizing material jetted from the monitor 15J is set so as to collide at a position radially outward than that shown in FIG. Therefore, by rotating while moving the jet Js from the monitor 15J and moving in the P1 direction (left side in FIG. 41), the large diameter expanded hole 15a filled with the solidifying material or the stabilizing material is excavated. At this time, the diameter-enlarging bit 32A has an effect of centering the monitor 15J with respect to the guide hole 3 when guiding the monitor 15J while expanding the diameter of the guide hole 3.

The points other than the points shown in FIGS. 41 and 42 are the same as the fourth embodiment (the technical contents of the modified examples of FIGS. 41 and 42).

It is well known that even a flexible tube is very difficult to insert into an excavation hole that is slightly larger than the outer diameter of the flexible tube. However, according to the modified examples of FIGS. 41 and 42, FIGS.
It is possible to dig a drill hole having a diameter much larger than that of the fourth embodiment shown in FIG. In other words, according to the modified examples shown in FIGS. 41 and 42, it is possible to relatively easily insert the flexible tubular member 36 into the enlarged bore 15a.

43 to 46 show a fifth embodiment of the present invention, showing a method of embedding a tubular member whose outer periphery is reinforced by a coil having expansion and expansion characteristics. After the same preparation process as in the first embodiment, the starting point P1 is set by the flexible guide rod 2 attached to the bending boring machine 1.
The leading hole 3 that curves from the bottom to the reaching point P2 and curves in the underground direction is excavated. This process is a guide hole excavation process (not shown).

In FIG. 43, in the leading hole 3 excavated as described above, the expanded diameter bit 32B and the coiled reinforcing member coil 6K are wound around the outer circumference of the hollow tubular member 6 to reinforce the contracted metal. Pull in the guide rod 2 that connects the tube 6 to the expansion bit 3 in the direction of the starting point P1.
The metal tube 6 in the contracted state is inserted while the diameter of the leading hole 3 is expanded to the diameter expansion hole 32C by 2B.

Next, as shown in FIG. 44, the diameter of the guide hole 3 is expanded to the expanded diameter hole 32C, and the metal tube 26 is arranged in the expanded diameter hole 32C. The process of FIGS. 43 and 44 is a hollow tubular member arranging process. Then, the metal tube 6 is prepared for supplying the high-pressure fluid Qh.

Then, in FIG. 45, pressure is applied by the high-pressure fluid Qh over the entire length of the metal tube 6 to expand and expand the diameter of the metal tube 6 and the coil 6K. Coil 6
K expands to fit into the outer peripheral portion of the metal tube 6 and become integrated, improving the pressure resistance rigidity and preventing the metal tube from being crushed even if the ground loosens due to earth pressure or vibration. This pressurizing work is a high pressure fluid supply process. Next, as shown in FIG. 46, after completing the construction of the diameter-expanded metal tube 6A over the entire length, the backfill material CG is injected into the gap between the diameter-expanded metal tube 6A and the inner peripheral surface of the lead hole 32C after the diameter expansion. .

When injecting the backfill material CG, for example, as shown in FIG. 47, the expanded metal tube 6A is used.
And the guide hole 32C after the diameter expansion, in the gap between the guide hole 32C and the back-filling material injection pipe 12 toward a not-shown arrival point (left side in FIG. 47).
While moving, the backfill material CG is intermittently injected.

As described above, the coil 6K is improved in pressure resistance without being reduced in flexibility and is inserted into the diameter-expanding hole 32C.
Expand K to reinforce earth pressure resistance. This method is effective when the pressure resistance of the metal tube 6 is insufficient.

48 to 50 show a sixth embodiment of the present invention and show a method of expanding the diameter of a hollow tubular member by applying a compressive force in the axial direction without applying a fluid pressure.

As in the first embodiment, the preparatory steps are performed,
A flexible guide rod 2 attached to the bending boring machine 1 excavates a guide hole 3 that curves from the starting point P1 to the reaching point P2 and curves in the underground direction. This process is a guide hole excavation process (not shown).

As shown in FIG. 48, a hollow tubular member whose outer diameter expands and expands by applying a compressive force in the axial direction in the guide hole 3 excavated as described above, for example, a metal tube having a large bellows fold as shown in the drawing. Insert 46 and place over full length. Then, the vibrating element 40 of the vibrating means is attached to the outer periphery of the metal tube 46. This is the hollow tubular member placement step. Preparation is made to apply a compressive force F to the metal tube 46 on the starting side and the reaching side of the metal tube 46.

The vibrating element 40 is preferably composed of a fine array using a porous silicon material described in Nature Magazine No. 400, published on August 26, 1999, pp. 853-855. An element having the same vibration function may be used.

Next, in FIG. 49, an axial external force F is applied to the metal tube 46 having the free diameter in FIG. 48, and the vibrating element 40 is operated to expand the tubular member 46. The soil G is compressed by the outward direction change of the external force F, and the soil is shaken by the vibration. The soil around which the vibration is applied becomes more flexible and the voids are filled, and the ground is tightened. The metal tube 46 becomes a diameter-increased metal tube 46A and adheres to the soil. This process
This is the step of expanding the diameter of the tubular member.

FIG. 50 shows a state in which the metal tube 46A is stabilized by the above process. By the above construction method, the diameter of the metal tube can be expanded without applying fluid pressure.

The illustrated embodiment is merely an example,
It is additionally noted that the description is not intended to limit the technical scope of the present invention.

[0093]

The effects of the present invention are listed below. (1) The expandable hollow tubular member is inserted into the guide hole excavated by bending with the flexible guide rod, and the pressure is expanded by the high-pressure fluid to expand the diameter, so that the conventional curved hole cannot be embedded. It is possible to bury underground a large-diameter hollow tubular member underground in roads, railways, rivers, etc., and to install water pipes, gas pipes, communication cables, etc. (2) Since the hollow tubular member that can be expanded while expanding the curved and excavated leading hole with the expanding bit at a time is pulled in once, and then expanded with high pressure fluid to expand the diameter, the construction is easy, Suitable for embedding hollow tubular members in solid soil without fear of collapse, shortening the construction period and reducing the construction cost. (3) If the solidifying material is injected into the gap between the hollow tubular member and the ground after the hollow tubular member is expanded and arranged, the hollow tubular member can be buried stably. (4) If the hollow tubular member is a seamless single member,
Within the range of curvature that can be used for construction, construction becomes easy. (5) In the case where a plurality of hollow tubular members are connected to each other, if a process of expanding a joint region between members that does not expand or expand, for example, a packer expansion, high pressure pressurization, or a diameter expansion process by a hydraulic robot is adopted, , The bottleneck can be eliminated. (6) The cross-jet injection means (cross-jet monitor) connected to the tip of a flexible rod (or via a diameter-expanding bit) is used to excavate and expand the diameter of the guide hole by solidifying material injection to improve the ground, and form a tube. If the member is retracted, a large-diameter tubular member can be embedded in the fragile ground. (7) When an expandable hollow tubular member reinforced with an expandable coil is drawn into the expanded hole expanded with the expanding bit and pressurized and expanded with a high-pressure fluid, the coil expands into a pressure-resistant reinforcing material. Reinforce the hollow tubular member. (8) A vibrating element is added to a hollow tubular member that expands in diameter when compressed in the axial direction, and the vibrating element is placed in the guide hole to expand the diameter by applying force from the front-rear direction and vibrating the vibrating element. It is easy and the surrounding voids are filled and the ground is closed. Also,
The hollow tubular member can be embedded without pressurization by a high pressure fluid.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a guide hole excavating process using a guide rod according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a construction in which a metal tube is drawn into the guide hole by a guide rod.

FIG. 3 is a cross-sectional view showing a contracted state of a metal tube.

FIG. 4 is a cross-sectional view showing an expanded state of a metal tube.

FIG. 5 is a side cross-sectional view showing a state in which a high-pressure fluid is supplied to a metal tube drawn in a guide hole.

FIG. 6 is a side cross-sectional view showing a state in which a metal tube drawn into a guide hole is expanded by a high-pressure fluid.

FIG. 7 is a side view showing an aspect of expanding a non-expanding connection part of a metal tube, showing a state where an expansion packer is inserted and arranged in the non-expansion connection part of the metal tube.

FIG. 8 is a side view showing a state where the unpacked connecting portion of the metal tube is expanded by expanding the packer.

FIG. 9 is a side view showing a state where the unexpanded connection part of the metal tube is expanded and then the packer is contracted and moved.

FIG. 10 is a side view showing another mode of expanding the unexpanded connection part of the metal tube, showing an unexpanded connection part of the metal tube.

FIG. 11 is a side view showing a state in which a packer is arranged before and after an unexpanded connection portion and a high-pressure fluid supply tube is inserted toward the connection portion.

FIG. 12 is a side view showing a state where the high-pressure fluid is supplied from the tube and the connection portion is expanded.

FIG. 13 is a front view of a robot used in yet another mode for expanding the unexpanded connection part of the metal tube.

FIG. 14 is a side view of the robot.

FIG. 15 is a side sectional view showing a state in which the robot is self-propelled at a connection portion of a metal tube that does not expand.

FIG. 16 is a side sectional view showing a state in which the robot expands its wings to inflate the connecting portion.

FIG. 17 is a side cross-sectional view showing a state in which a slender packer extending over the entire inner length of the hollow tubular member is arranged in another mode in which the diameter of the metal tube drawn into the guide hole is expanded.

FIG. 18 is an X-X cross-sectional view showing the relationship between the metal tube and the packer in the contracted state.

FIG. 19 is a side sectional view showing a state where the metal tube is expanded and the diameter thereof is expanded by the expansion of the packer.

20 is a cross-sectional view taken along line X1-X1 of FIG. 20, showing a state where the metal tube has expanded and expanded in diameter.

FIG. 21 is a side sectional view showing a guide hole excavation by a guide rod for burying a metal tube without a connecting portion in the second embodiment of the present invention.

FIG. 22 is a side sectional view showing the construction of pulling the metal tube into the guide hole by a guide rod.

FIG. 23 is a side sectional view showing a state in which a high-pressure fluid is supplied to a metal tube drawn into a guide hole.

FIG. 24 is a side sectional view showing a state in which a metal tube drawn into a guide hole is expanded by a high-pressure fluid.

FIG. 25 is a side cross-sectional view showing a state in which a slender packer extending over the entire length of the hollow tubular member is arranged in a metal tube drawn into a guide hole, and a high-pressure fluid is supplied.

FIG. 26 is an X2-X2 cross-sectional view showing the relationship between the metal tube and the packer in the contracted state.

FIG. 27 is a side sectional view showing a state in which the metal tube is expanded and expanded in diameter by the expansion of the packer.

28 is a cross-sectional view taken along the line X3-X3 of FIG. 28, showing a state where the metal tube has expanded and expanded in diameter.

FIG. 29 is a side sectional view showing a state in which a contracted metal tube is drawn in while expanding the leading hole with a diameter expanding bit in the third embodiment of the present invention.

FIG. 30 is a side sectional view showing a state in which the drawn metal tube is pressurized and expanded over the entire length.

FIG. 31 is a side sectional view showing a state where the metal tube is expanded over the entire length.

FIG. 32 is a sectional view showing a contracted state of the metal tube.

FIG. 33 is a cross-sectional view showing a state after expansion of the metal tube.

FIG. 34 is a side view showing a state in which a solidifying material (backfill material) is injected into the gap between the expanded metal tube and the ground.

FIG. 35 is a side sectional view showing the guide hole excavation by the guide rod according to the fourth embodiment of the present invention.

FIG. 36 is a side sectional view showing a state where a diameter expansion monitor is attached to the tip of the guide rod after excavating the guide hole.

FIG. 37 is a side sectional view showing a state in which a corrugated metal tube is drawn in while expanding a diameter by injecting a cross jet from a diameter expansion monitor.

FIG. 38 is a side sectional view showing a state in which the corrugated metal tube is pulled in over the entire length and back-filled.

FIG. 39 is a top view showing a mode in which a plurality of metal tubes are simultaneously installed.

FIG. 40 is a view on arrow Z in FIG. 43.

41 is a rapid cross-sectional view showing a state in which the corrugated metal tube is pulled in using a monitor that expands to a larger diameter than the diameter expansion monitor shown in FIG.

42 is a partially enlarged view showing the monitor shown in FIG. 42 in detail.

FIG. 43 is a side cross-sectional view showing a state in which a metal tube reinforced by a coil is drawn in while expanding a leading hole with a diameter-enlarging bit according to a fifth embodiment of the present invention.

FIG. 44 is a side cross-sectional view showing a state in which a metal tube reinforced with a coil is drawn over the entire length and expanded by a high pressure fluid.

FIG. 45 is a side sectional view showing a state where the metal tube reinforced by the coil is expanded over the entire length.

FIG. 46 is a side sectional view showing a state in which backfill injection is performed after the high-pressure fluid is removed.

FIG. 47 is a side view showing a state in which a solidifying material (backfill material) is injected into the gap between the expanded metal tube and the ground.

FIG. 48 is a side sectional view showing a state in which a bellows-shaped metal tube that expands in the radial direction when compressed in the axial direction is arranged in the guide hole in the sixth embodiment of the present invention.

FIG. 49 is a side sectional view showing a state in which the bellows-shaped metal tube is axially compressed and the metal tube is vibrated to expand its diameter.

FIG. 50 is a side sectional view showing a state after the diameter has been expanded.

[Explanation of symbols]

R: Transportation route Cg ... Backfill material G: soil GL ... the ground surface P1 ... Excavation starting point P2 ... Excavation destination 1. Bending boring machine 2 ... Bent bowling rod 2a ... Tip 3 ... Leading hole 4 ... Fitting 6 ... Metal tube in contracted state 6A ... Expanded metal tube 6a ... Void in contracted state 6b ... Void in expanded state 7j ··· Connection part 7a, 7b ... Connection end 12 .. Backfilling material injection pipe 13 ... Impulse pipe 14. Packers

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takahiko Mihara             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. (72) Inventor Yoneda Satoshi             Chemika, 1-6-4 Moto-Akasaka, Minato-ku, Tokyo             Inside Le Grout Co., Ltd. F term (reference) 2D054 AC18 AD27 AD32 AD37 BA18                       BA20 BA28

Claims (9)

[Claims] 1. A guide hole excavating step of drilling a guide hole using a flexible rod, and a hollow tubular member which is inflatable and contracted is connected to the tip of the flexible rod, A contraction tube disposing step of inserting the hollow tubular member into the leading hole by pulling the flexible rod toward the starting side, and supplying high-pressure fluid into the hollow tubular member to compress surrounding soil. And a step of supplying a high-pressure fluid for expanding the hollow tubular member. 2. A leading hole excavating step of drilling a leading hole using a flexible rod, a rod having flexibility, a diameter-enlarging bit connected to the tip of the rod, and the diameter-enlarging bit. Expanding the leading hole by pulling the connected hollow tubular member in an inflatable and contracting state, and inserting the hollow tubular member into the expanded leading hole; A high-pressure fluid supply step of expanding the hollow tubular member while compressing the surrounding soil by supplying the inside
And a tubular member burying method. 3. The tubular member embedding method according to claim 1, further comprising a step of injecting a solidifying material into a gap between the hollow tubular member and the ground after the hollow tubular member is expanded. 4. The method for embedding a tubular member according to claim 1, wherein the hollow tubular member is a single member having no seam. 5. The hollow tubular member is configured by connecting a plurality of members, and has a step of expanding a joint region between unexpanded members after supplying a high-pressure fluid.
4. The method for embedding a tubular member according to any one of 3 to 3. 6. A guide hole excavating step of drilling a guide hole using a flexible rod, a flexible rod, a cross jet injection means connected to the rod, and the cross jet injection means. By pulling the connected hollow tubular member along the leading hole and jetting a cross jet from the cross jet jetting means to rotate the jetting means, a region having a diameter larger than that of the front duct is formed along the tip conduit. A step of improving the ground or stabilizing the ground, and inserting the hollow tubular member into the area where the ground is improved or the ground is stabilized,
And a tubular member burying method. 7. The cross jet injection means is connected to the flexible rod through a diameter-expanding bit.
Method for embedding tubular member in. 8. A coil-shaped reinforcing member is wound around the outer peripheral portion of the hollow tubular member and arranged.
The method for embedding a tubular member according to any one of 1. 9. A guide hole excavating step of drilling a guide hole using a flexible rod, and a structure capable of contracting in the longitudinal direction and expanding outward in the radial direction when contracted in the longitudinal direction. A hollow tubular member disposing step of disposing a hollow tubular member provided with a vibrating means in the leading hole, and contracting in the longitudinal direction while vibrating the hollow tubular member by the vibrating means. A tubular member diameter expanding step of expanding outward in the radial direction, and a tubular member embedding method.