JPH07301095A - Structure of tunnel and building method and building device - Google Patents

Abstract

PURPOSE:To provide a tunnel of strong structure to rationalize construction, shorten the working term, and reduce the construction cost and provide a building method and a building device. CONSTITUTION:In the structure of a tunnel wherein a plurality of buried pipes 17 are buried in the outer periphery of a tunnel 9 along the direction of the length thereof. A curved buried pipes 17 bent in the length of the tunnel 9 and the pipe 17 is arranged in a ring-form manner throughout the whole area of the outer periphery of the tunnel 9. The support strength of a natural ground around the tunnel 9 is reinforced and a contact area between the buried pipe 17 and the natural ground 7 is increased to form a strong structure. A uniform strength is provided throughout the whole area of the outer periphery of the tunnel 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid tunnel structure capable of rationalizing the construction, shortening the construction period and reducing the construction cost, and a construction method and a construction apparatus thereof.

[0002]

2. Description of the Related Art For example, when excavating an urban tunnel, a pipe roof construction method has been conventionally known as a method for preventing subsidence of the ground surface and measures for stabilizing the face. This pipe roof construction method
Prior to excavation of the tunnel, a straight tubular steel pipe is generally inserted by horizontal boring on the top end side of the excavation cross section to form a roof that matches the tunnel shape, and the above roof is directly supported by supporting work as the tunnel is excavated. By doing so, the looseness of the ground due to excavation is suppressed and the tunnel is constructed safely.

However, this conventional pipe roof construction method is
The accuracy of boring affects the arrangement of steel pipes,
Since the error increases in proportion to the length of the steel pipe, the layout design of the steel pipe is difficult and the construction length is restricted.

When an underpass is constructed by using such a pipe roof construction method, as shown in FIG. 24, a hole is horizontally drilled directly above the top end portion of the entrance and exit of the underpass 1 in the longitudinal direction, and the excavation hole is drilled. The straight pipe 2 is inserted and buried, and the pipe 2 is supported by a supporting work (not shown) along with the excavation of the tunnel to suppress the loosening of the ground due to the excavation and the top end side of the underpass 1. I was excavating the area divided by the saddle section.

Therefore, in this case, in addition to the substantial excavation of the underpass 1, it is necessary to excavate the peripheral portion indicated by the diagonal lines in FIG. 24, leaving the ground support ground 3 from the surface of the earth. However, there was a problem that it took time to excavate that much, which prolongs the construction period and soars the construction cost. On the other hand, when constructing the underpass 1, it is necessary to avoid the approach to the surface of the ground and the structures 4 in the ground, and to avoid passing through the private areas as much as possible, but it is difficult to acquire the land in a city or a dense residential area. Together, it is difficult to secure such a construction environment, forcing deep digging by making use of vertical shafts, which makes the construction large and complicated, which prolongs the construction period and raises the construction cost. The attachment passages 5 and 6 connecting from the ground to the underpass are lengthened, and the above-mentioned problems are increased.

By the way, as a solution to the problem of the horizontal boring or pipe roof construction method, a so-called curved boring technique for excavating the ground in a curved shape has recently been developed, and a tunnel using the boring has been developed. A widening method has been proposed. For example, JP-A-4-2819
In Japanese Patent Publication No. 90, a shield tunnel is used as a starting point for curved boring, an erection frame is installed in the tunnel, the boring propulsion device is assembled to the frame, and the excavation device is propelled to a widened portion from the device. Then, a curved pipe is bored in the ground, a curved pipe is propelled and buried in this excavation hole, a frozen pipe is inserted in the pipe, and a frozen soil wall is created around the widened portion to improve the surrounding ground. After that, the widened part is excavated.

However, since this widening method is premised on the use of an existing shield tunnel, it is not practical to construct an underpass or a mountain tunnel that cannot be used from the beginning, and it is also difficult to construct a curved pipe. Since the ground is interposed between the lining wall and the curved pipe, the binding force between the curved pipe and the lining wall is weak, and sufficient strength cannot be obtained, and it is also very useful for freezing frozen soil walls and maintaining freezing during excavation. In addition to requiring time, the refrigerating equipment and the refrigerant pipes are required, which causes a problem that the construction period is prolonged and the construction cost is increased.

[0008]

SUMMARY OF THE INVENTION The present invention solves such a problem and uses a curved boring device to keep the amount of excavation to a necessary minimum, thereby shortening the construction period and reducing the construction cost of a robust tunnel. An object of the present invention is to provide a structure, a method of building the structure, and a building device.

[0009]

A tunnel structure according to the present invention is a tunnel structure in which a plurality of buried pipes are buried along the length direction on the outer circumference of the tunnel. Is buried to increase the contact area between the buried pipe and the ground, and the pipe is arranged over the entire circumference of the tunnel to form a solid structure. In the structure of the tunnel of the present invention, a curved pipe-shaped buried pipe buried in the tunnel is extended around the mounting passage communicating from the entrance and exit of the tunnel to the ground to strengthen the ground around the tunnel and the mounting passage. .
The structure of the tunnel of the present invention is such that a buried pipe that bends downward is buried over the entire outer circumference of the tunnel that bends downward,
For example, the structure is suitable for underpass. In the tunnel structure of the present invention, an upwardly curved buried pipe is buried over the entire outer circumference of the upwardly curved tunnel, which is suitable for an underpass or a small-scale tunnel, for example. In the structure of the tunnel of the present invention, the buried pipe is filled with the filling member to make the structure more rigid. In the structure of the tunnel of the present invention, the filling member is filled in the buried pipe, and the reinforcing member is buried in the filling member, so that the structure is more solid. The method for constructing a tunnel of the present invention is to dig a plurality of drill holes along the length direction on the outer periphery of the tunnel, and after burying a buried pipe in the drill holes,
In the method of constructing a tunnel for excavating the ground inward from the buried pipe, a curved drill hole is drilled along the length direction of the tunnel over the entire circumference of the tunnel, and the curved buried pipe is drilled in the drill hole. After burying, excavate the natural ground surrounded by the buried pipe,
In addition to stabilizing the entire face, excavation of the ground is kept to the minimum necessary to streamline the excavation, shorten the construction period, and reduce the construction cost. The method of constructing a tunnel of the present invention, a curved excavation hole is extended around a mounting passage communicating from the entrance of the tunnel to the ground, and a buried pipe is buried in the excavation hole over the tunnel and the mounting passage. The ground of the tunnel and mounting passage surrounded by these buried pipes can be excavated so that the tunnel and mounting passage can be excavated safely and reasonably. The method for constructing a tunnel of the present invention is to dig a plurality of excavation holes curved downward along the length direction of the tunnel over the entire circumference of the tunnel, and to bury a buried pipe curved downward in the excavation holes, For example, the construction method is suitable for underpass. The method for constructing a tunnel of the present invention is to dig a plurality of excavation holes that curve upward along the lengthwise direction on the outer periphery of the tunnel, and bury an embedded pipe that curves upward in the drill holes.
For example, the method is suitable for underpasses and small-scale tunnels. The method of constructing a tunnel of the present invention comprises excavating a vertical shaft at a planned entrance / exit of the tunnel, excavating a curved drill hole in the length direction of the tunnel from the vertical shaft, and burying a curved buried pipe in the drill hole. For example, it is suitable for building underpasses with deep soil cover. The method of constructing a tunnel of the present invention, the entrance and exit of the tunnel, from the ground opening planned position of the mounting passage connecting to the ground from the entrance, excavate a curved drill hole in the length direction of the tunnel and the mounting passage, After burying a curved buried pipe in the excavation hole, the ground of the tunnel and the mounting passage surrounded by these buried pipes is excavated, which is suitable for construction of, for example, a shallow underpass. The tunnel building device of the present invention includes a work platform on which a curved boring device can be installed, and in the tunnel building device in which a propulsion device of the curved boring device is installed, the work platform is installed in a vertical shaft provided at the entrance and exit of the tunnel. The pedestal is installed so that the vertical position can be adjusted, and is movable in the direction orthogonal to the length direction of the tunnel so that boring and burying of the buried pipe can be performed accurately. A tunnel building apparatus of the present invention includes a work platform on which a curved boring apparatus can be installed, and a tunnel building apparatus in which a propelling apparatus for the curved boring apparatus is installed on the platform, and the tunnel entrance and exit, and the tunnel from the entrance to the ground. A work platform is installed at a planned opening on the ground with the mounting passage, and the platform can be installed at a boring construction position so that boring construction and burial of a buried pipe can be performed easily and accurately.

[0010]

[Operation] According to the invention of claim 1, a curved tubular buried pipe is buried in the length direction of the tunnel to increase the contact area between the ground and the buried pipe, thereby making the tunnel structure firm. In addition, a buried pipe is arranged over the entire circumference of the tunnel to make the strength uniform over the entire area of the tunnel. According to the second aspect of the present invention, the curved tubular buried pipe buried in the tunnel is extended around the mounting passage communicating with the ground from the entrance of the tunnel to strengthen the ground around the tunnel and the mounting passage. The invention according to claim 3 is a structure suitable for, for example, an underpass, in which a buried pipe that curves downward is buried over the entire outer circumference of a tunnel that curves downward. According to the invention of claim 4, the buried pipe that curves upward is buried over the entire outer circumference of the tunnel that curves upward.
For example, this structure is suitable for underpasses and small-scale tunnels. According to the invention of claim 5, the filling pipe is filled with a filling member,
It has a more solid structure. According to a sixth aspect of the present invention, a filling member is filled in the embedded pipe, and a reinforcing member is embedded in the filling member,
It has a more solid structure. In the invention of claim 7, a curved excavation hole is excavated along the entire length of the outer circumference of the tunnel along the length direction of the tunnel, a curved pipe-shaped buried pipe is buried in the drilled hole, and then the ground pipe is surrounded by the buried pipe. By excavating mountains, the entire face will be stabilized, and the excavation of natural ground will be kept to the minimum necessary to streamline the excavation, shorten the construction period, and reduce the construction cost. According to the invention of claim 8, a curved excavation hole is provided around a mounting passage communicating from the entrance of the tunnel to the ground,
A buried pipe is buried in the excavation hole over the tunnel and the mounting passage, and the ground of the tunnel and the mounting passage surrounded by these buried pipes can be excavated, so that the tunnel and the mounting passage can be excavated safely and rationally. It The invention of claim 9 excavates a plurality of excavation holes curved downward along the length direction of the tunnel over the entire circumference of the tunnel, and burys a buried pipe curving downward in the excavation holes. This method is suitable for pass. The invention of claim 10 excavates a plurality of upwardly curved drill holes along the lengthwise direction on the outer circumference of a tunnel, and burys upwardly curved buried pipes in the drill holes, for example, underpass or small scale. This method is suitable for tunnels. In the invention of claim 11, a vertical shaft is excavated at a planned entrance / exit of the tunnel, a curved drill hole is drilled from the vertical shaft in the length direction of the tunnel, and a curved buried pipe is buried in the drill hole. Suitable for construction of deep undercover underpass. Claim 1
A second aspect of the invention is to excavate a curved excavation hole in the length direction of the tunnel and the attachment passage from a planned opening on the ground of the entrance and exit of the tunnel and the attachment passage that connects the entrance and the ground to the ground. A curved buried pipe can be buried so that drilling holes can be easily drilled and buried pipes can be laid easily. The ground of the tunnel and the mounting passage surrounded by the buried pipe can be excavated, and the tunnel and the mounting passage can be excavated safely and rationally. For example, it is suitable for construction of an underpass with a shallow earth cover. According to the invention of claim 13, a work platform is installed in a vertical shaft provided at the entrance and exit of the tunnel, the platform is vertically adjustable, and is movable in a direction orthogonal to the length direction of the tunnel. It is suitable for underpass construction and can accurately perform boring of excavation holes and burial of buried pipes. In the invention of claim 14, the work platform is installed at the planned opening position on the ground between the entrance and exit of the tunnel and the mounting passage communicating from the entrance and exit to the ground,
The pedestal can be installed at a boring construction position, which is suitable for construction of an underpass with a shallow soil cover, and boring construction and burial of a buried pipe can be performed easily and accurately.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illustrated embodiment in which the present invention is applied to an underpass having a relatively shallow soil cover will be described below. In FIGS. 1 to 16, numeral 7 indicates a rock excavation ground in an urban area or a mountain area. Existing structures 8 such as houses, factories, and substations are installed on the ground 7, and an underpass 9 which is an underground tunnel is provided inside the ground 7.

The underpass 9 is formed in a vertical cross-sectional shape that is gently curved downward, and its inner air cross-section is formed in a circular shape, which has a saddle portion 9a in the middle as its lowest position.
It is gently curved upward in the directions of the entrances and exits 10 and 11, and mounting passages 12 and 13 that communicate with the ground are provided outside the entrances and exits 10 and 11. In this case, the inner cross-section of the underpass 9 is not limited to a circle, but an ellipse or a rectangle,
Other shapes may be used.

In the case of the embodiment, the inner cross-sections of the mounting passages 12 and 13 are formed in a circular shape having the same shape as the underpass 9, and the horizontal plane shape in which the passages 12 and 13 open to the ground is under-shaped as shown in FIG. It is formed in an elliptical or elliptical shape that is long in the direction of the path 9. A lining wall 14 such as a concrete wall is formed on the inner surface of the underpass 9, and the mounting passage 12,
On the peripheral surface of 13, lining walls 15 and 16 such as concrete or road walls are formed, and the vertical cross-sectional shapes of these lining wall 14 and the road-side lining walls 15 and 16 are under as shown in FIG. A curved shape is formed in a shape substantially similar to the path 9, and a plurality of embedded pipes 17 are embedded in a ring shape on the outside thereof. In this case, when the underpass 9 is exclusively for passers-by except for vehicles, it is possible to provide a road surface or stairs having a predetermined slope on the lining walls 15 and 16 of the mounting passages 12 and 13.

The buried pipe 17 is composed of a plurality of buried short pipes (not shown), which are axially connected to each other to form a curved pipe. The vertical cross-sectional shape thereof is substantially similar to that of the underpass 9 as shown in FIG. Are formed in parallel with each other and are arranged in parallel along the underpass 9 and the mounting passages 12 and 13, and the pipe ends thereof are arranged around the openings of the underpass 9 and the mounting passages 12 and 13.

The pipe ends of the buried pipe 17 are symmetrically arranged at the center of the underpass 9 as shown in FIG.
The position, length, and radius of curvature of 7 are all different except for a pair of symmetrically embedded buried pipes 17, and pipe joints 18, 18 are connected to their outer circumferences. For example, as shown in FIG. 1, a buried pipe 17 having a short size and a small radius of curvature is used on the periphery of the opening of the entrance / exit 10, while the periphery of the opening of the mounting passage 12 separated from the entrance / exit 10 is as shown in FIG. In comparison with the above-mentioned buried pipe 17, a long buried pipe 17 having a large radius of curvature is used. The pipe joints 18, 18 are made of curved small-diameter curved pipes similarly to the buried pipe 17, and the slits 19, 19 formed on the peripheral surfaces thereof are arranged upward or downward, and the pipe joints 18 adjacent to them are arranged. , 18 are inserted to connect the adjacent buried pipes 17, 17.

In this case, the pipe joints 18, 18 are not indispensable as a means for arranging the buried pipe 17 in a ring shape, and it is possible to omit this, and by doing so, the buried pipe 17 is buried. Further, the connecting work can be performed easily and quickly, but in that case, the embedded pipes 17 are arranged at a predetermined interval without restraining each other. Further, as means for increasing the strength of the buried pipe 17, as shown in FIG. 11, a filling member 20 such as concrete or mortar is filled inside the buried pipe 17, or as shown in FIG.
A reinforcing member 21 such as an I-beam may be embedded in the inside of 0.

Underpass 9 including mounting passages 12 and 13
The plane shape of the opening to the ground is substantially elliptical or oval as shown in FIG. 4, and the base frame 22 is fixedly installed via the ground anchor 23 on the planned ground of the opening. Base frame 2
2 is formed in an elliptical shape or an elliptical shape larger than the opening shape, and has an opening window 22a having substantially the same shape as the opening shape as a positioning means inside thereof, and the opening window 22a is formed in the opening portion. A pair of guide rails 24 are laid on the frame 22 so as to be aligned with the periphery of the planned position. The guide rail 24 is arranged in an elliptical or oval ring shape similar to the shape of the opening, and the traveling wheel 2 is mounted on the rail 24.
A work platform 26 is movably installed via the terminals 5 and 25.

The work platform 26 can be fixed at an appropriate position on the guide rail 24 via a lock mechanism (not shown).
A frame 27 is erected on the stand 26. A propulsion base 28 is installed on the frame 27 via bolts and nuts so that the vertical and horizontal positions and angles can be adjusted, and a well-known curved boring device 29 similar to, for example, Japanese Patent Laid-Open No. 4-281990 is mounted on the base 28. The propulsion device 30 constituting the above is attached.

The curved boring device 29 includes an excavation device and a propulsion device 30, which will be described later.
Is a propulsion cylinder consisting of a hydraulic cylinder (not shown)
have. The propulsion cylinder is connected to the embedded pipe 17 via the original push case 31, and the embedded pipe 17 can be sent out to the natural ground 7 side, that is, downward, by the extension operation of the cylinder rod (not shown).

The embedded pipe 17 is curved in an arcuate shape, and a curved inner pipe (not shown) is inserted therein, and the inner pipe is installed in a propulsion cylinder (not shown) installed in the vicinity of the original push case 31. They are linked and can be delivered in the same direction as the buried pipe 17 through the extension operation of the cylinder rod (not shown).

The above-mentioned excavation device (not shown) is connected to the tip of the inner pipe, and the device is provided with a hydraulic motor, a swing device, a speed reducer, and an excavation bit (both not shown), and the rotation of the hydraulic motor. The driving force is transmitted to the excavating bit through the speed reducer, and the swinging device allows the excavating bit to swing at a constant level. In the figure, 32 is a curved pipe holder capable of sandwiching the peripheral surface of the buried pipe 17, 33 is a mouth pipe arranged at a predetermined position of the base frame 22 corresponding to the burying start position of the buried pipe 17, and they are obliquely upward. It is open.

In addition, reference numeral 34 in the figure denotes a ring-shaped support for supporting the buried pipe 17, which is constructed by connecting steel arch supports in a ring shape. In this case, the support work 34 is arranged in a similar shape to the arrangement condition of the buried pipe 17 to be supported, in other words, the cross-sectional shape of the underpass 9, for example, in the case of an elliptical cross-section, an elliptical shape or a rectangular shape. In the case of a cross section, it is arranged in a rectangle. In this embodiment, the guide rail 24 is laid on the base frame 22 so that the work platform 26 can be moved. However, the guide rail 24 is omitted, and the work platform 26 is manually inserted each time the buried pipe 17 is embedded. Move to a predetermined position on the base frame 22,
This may be fixed by an appropriate means such as screwing.

17 to 22 show another embodiment of the present invention, and the same reference numerals are used for the portions corresponding to the above-mentioned constitution. Of these, the embodiment shown in FIGS.
The example of construction of the underpass 9 which has a deep soil cover and therefore requires deep digging is shown. That is, in this case, the shafts 35, 3 are provided at the corresponding positions of the entrances 10, 10 of the underpass 9.
6 is excavated, and a plurality of vertical frames 3 are provided on the inner circumference of the one vertical shaft 35.
7, the base frame 22 is horizontally installed between the frames 37, 37 in the direction of the underpass 9. On the base frame 22,
A guide rail 24 is laid parallel to the underpass 9 in a direction perpendicular to the underpass 9, and a work platform 26 is movably installed on the rail 24 via traveling wheels 25.

A propulsion base 28 is attached to the work base 26 via bolts and nuts so that the installation position and angle can be adjusted, and a propulsion device 30 of a curved boring device 29 is attached to the base 28. Pulleys 38, 38 are rotatably attached to the upper end of the work platform 26, and a hoisting winch 3 is provided on the upper portion of the vertical frames 37, 37 installed in the center.
8 and 39 are installed, the wire ropes 41 and 41 wound around the pulleys 38 and 38 are wound around the hoisting drums 40 and 40, and the work platform 26 is vertically movable.

In this case, the base frame 22 and the guide rail 24 are adjusted in vertical position according to the position of the work platform 26,
The adjustment position is adjusted by, for example, bolts and nuts to the vertical frame 3
It is fixed to 7,37. In the figure, reference numerals 42 and 43 denote side jacks provided at the upper and lower positions of the work platform 26, which can be expanded and contracted in the coaxial direction with the underpass 9, and the landing portion 4 at the tip thereof.
2a and 43a can be brought into contact with a reaction force receiver (not shown) on the inner surface of the vertical shaft 35.

That is, in this embodiment, when constructing the underpass, first, as shown in FIG. 18, shafts 35 and 36 are excavated at positions corresponding to the entrances and exits 10 and 11 of the underpass 9, and the depth thereof is set to the saddle portion of the underpass 9. 9a is deeper and the width in the direction of the underpass 9 is wider than the short pipe length of the buried pipe 17, and the base frame 22 and the vertical frame 37 are provided in one of the shafts 35.
And are installed as shown in FIG. 19, and the guide rail 24 is laid on the base frame 22 in the direction orthogonal to the underpass 9.

The base frame 22 corresponds to the first boring start position by the curved boring device 29, and the vertical frames 37, 3 are provided.
Tighten bolt 7 to fix. Next, the work platform 26 is carried into the vertical shaft 35, and its traveling wheels 25, 25 are placed on the guide rails 24 to enable their movement, while the work platform 26 is mounted with the propulsion platform 28 adjusted in angle and position. The propulsion device 30 is attached to the table 28. After that, the mouth pipe 33 is connected to a predetermined position of the vertical frame 37, the embedded pipe 17 is inserted into the pipe 33, and the curved pipe holder 32 holds it, and the side jacks 42 and 43 are expanded and contracted. The parts 42a and 43a are brought into contact with the reaction force receiver, and the work platform 26
Fixed in place.

Under this circumstance, the excavator is driven, the excavation bit is rotated to start boring, and the propulsion device 30 is driven to send the buried pipe 17 containing the inner pipe to the excavation hole, When 17 is propelled for a predetermined distance, a buried pipe 1 for replenishment, which is placed by incorporating an inner pipe in advance outside the mine.
7 is carried into the mine and connected to the rear end of the preceding buried pipe 17. Then, the driving of the excavator is restarted, the excavation bit is rotated to start boring, and the propulsion device 30 is driven to send the embedded pipe 17 containing the inner pipe to the excavation hole, and the pipe 17 is moved at a predetermined distance. When it has been promoted, a buried pipe 17 for replenishment is connected to its rear end.

Thereafter, the above-described work is repeated to add the buried pipe 17, which is sequentially fed to the natural ground 7. When the tip of the buried pipe 17 reaches the other shaft 36, the propulsion of the buried pipe 17 is completed. After that, the inner pipe is pulled out to leave the buried pipe 17 in the ground 7, and the pipe 17 is buried.

Thus, after burying the buried pipe 17 for the length of the underpass 9, the side jacks 42 and 43 are reduced in size,
The restraint of the work platform 26 is released, and the work platform 26 is moved to the next boring position adjacent to the buried pipe 17. At the time of this movement, for example, the hoisting winches 38 and 39 are driven, and the wire ropes 41 and 41 are appropriately lengthened.
After winding it up to 0, 40 and raising the work platform 26 once,
The base frame 22 is removed from the vertical frames 37, 37 and fixed to the next mounting position.

Next, the hoisting winches 38, 39 are reversely driven, the wire ropes 41, 41 are sufficiently unwound, the work platform 26 is mounted on the guide rail 25, and the platform 2 is mounted.
After giving 6 a degree of freedom of movement to the left and right,
The driving of the hoisting winches 38 and 39 is stopped and the position is held. After that, the work platform 26 is pushed, moved along the guide rail 25 in the direction orthogonal to the underpass 9, and when the propulsion device 30 has moved to the position corresponding to the next mouth pipe 33, the side jacks 42, 43 are moved. Stretch,
The work platform 26 is fixed to the moving position.

Then, the buried pipe 17 is set again, the drilling device is driven to start the boring, the buried pipe 17 is sent to the drilling hole, and when the pipe 17 is propelled for a predetermined distance, the buried pipe 17 for addition is added. Is connected to the rear end portion of the preceding buried pipe 17, these operations are repeated to add the buried pipe 17, and after the completion of the promotion of the pipe 17, the inner pipe is pulled out and the buried pipe 17 is left in the natural ground 7. Buried.

In this way, a plurality of buried pipes 17 are buried in the ground 7 as shown in FIG. 21, and these are arranged in a ring shape in the circumferential direction of the underpass 9, and then the work platform 26, the base frame 22, and the vertical frame 37. And are removed from the vertical shaft 35, and the inner ground 7 divided by the buried pipe 17 is excavated. The excavation in this case is performed by the buried pipe 17
It is sufficient to excavate only the natural ground 7 surrounded by, and the excavation amount is larger than the volume of the inner sky section of the underpass 9, but the excavation amount divided by the imaginary line in FIG. 22 using the conventional pipe roof construction method is Compared with this, a much smaller amount does not require extra excavation, so a minimum amount of excavation is sufficient, rationalization of this type of excavation work is possible, and the excavation time is greatly shortened, the construction period is shortened and the construction cost is reduced. It is possible to reduce the size of excavation work.

A buried pipe 17 is provided around the underpass 9.
Are arranged, and these support the surrounding natural grounds 7, thereby strongly preventing the natural grounds 7 from collapsing due to excavation. Moreover, since the buried pipe 17 has a curved shape, the contact area with the natural ground 7 is larger than that of the conventional pipe having a straight tubular shape, and the natural ground 7 is strongly supported by that amount.

Next, along with the excavation of the natural ground 7, the support works 34 are assembled to the excavated portion in a ring shape and arranged at a predetermined interval to support the buried pipe 17. This situation is as shown in FIG. 22, which prevents deformation of the buried pipe 17 and collapse of the ground 7, and then assembles a formwork of a predetermined shape between the support works 34, 34 or carries in the existing formwork. Then, the frame and the buried pipe 1
Concrete is injected between the inner wall of the underpass 9 and the inner wall of the underpass 9 to form a lining wall 14.

Before and after the lining, the vertical shafts 35, 36
Of the mounting channels 12 and 13 are buried by using the pits 35 and 36, concrete is driven into the peripheral surfaces thereof to form the lining walls 15 and 16, and pavement concrete ( A series of operations are completed by placing (not shown) and creating the surrounding area.

The underpass 9 thus constructed is shown in FIG.
As described above, the buried pipe 17 is arranged along the length direction of the underpass 9 so as to be gently curved downward similarly to the vertical cross-sectional shape of the underpass 9. Therefore, since the entire area of the underpass 9 in the circumferential direction is supported by the buried pipe 17 to reinforce the portion, the underpass 9 is supported as compared with the structure in which only the top end portion is supported and reinforced as in the conventional pipe roof construction method. 9
Or the strength around the tunnel becomes uniform. Further, since the buried pipe 17 is curved, the contact area between the buried pipe 17 and the ground 7 is larger than that of the conventional pipe roof construction method in which a straight pipe is buried. A robust structure is obtained.

On the other hand, in the tunnel construction apparatus used in this embodiment, as shown in FIG. 20, a work base 26 on which a curved boring device 29 can be installed is installed at one of the entrances and exits 10 of the underpass 9, and the base 26 is underexposed. Since it is provided so as to be movable in the direction orthogonal to the path 9 and is adjustable in the vertical position, the propulsion device 30 can be accurately installed at a predetermined position according to the boring position or the burying position of the burying pipe 17, and their construction accuracy can be improved. improves. Further, since the work base 26 is provided with the side jacks 42 and 43 and the base 26 is fixed at a predetermined position so as to withstand the reaction force at the time of boring, the boring can be performed safely and accurately.

The embodiment shown in FIG. 23 is one in which the present invention is applied in place of the underpass 9 to a small tunnel 44 constructed on a small mountain in a mountainous area, a hill in an urban area, or an embankment. The vertical cross section is gently curved upward, a lining wall 14 is formed on the inner surface, and a plurality of embedded pipes 17 are embedded in a ring shape on the outer periphery of the wall 14. The buried pipe 17 is gently curved upwards similarly to the longitudinal cross-sectional shape of the tunnel 44, and this is constructed by connecting a plurality of buried short pipes in the axial direction to form a curved pipe, and the pipe 17 is connected to one of the inlets and outlets 10 The work platform (not shown) installed at the above position pushes the ground 7 upward to bury it.

Therefore, at the time of excavating the tunnel 44, only the inner ground sectioned by the buried pipe 17 has to be excavated. As in the conventional pipe roof construction method, the surrounding natural ground 7 which is sectioned by the imaginary line in FIG. Eliminated from the extra drilling of
This can be done reasonably and quickly. Moreover, the tunnel 44 has a plurality of buried pipes 1 having an upward arch shape.
An external force such as earth pressure acts on the pipe 17 in the axial direction of the pipe to form an axial compressive force, and the compressive force counters the bending moment and bending stress due to the external force and reduces them. Therefore, the strength is strengthened as a whole.

When the underpass 9 having a circular inner cross-section, which is one form of the tunnel, is constructed by the tunnel construction method shown in FIGS. 1 to 16 thus constructed, one of the ground openings is grounded. The base frame 22 is installed via the anchor 23. The opening shape on the plane of the underpass 9 is a long ellipse or an ellipse on the underpass 9 side as shown in FIG. 4, and the base frame 22 has an opening window 22a having substantially the same shape as the opening shape. The base frame 22 is installed by aligning the opening window 22a with the planned opening position.

Then, a pair of guide rails 24, 24 are laid on the base frame 22 in a ring shape similar to the opening shape, the traveling wheels 25 are placed on the rail 24, and the work platform 26 is mounted on the guide rail 24. Installed so that it can be moved along.
Then, the propulsion base 28 of the curved boring device 29 is installed at a predetermined position on the frame 27 of the work base 26, and the propulsion device 30 and its attached components are assembled to the base 28.

In this case, in this embodiment, since the base frame 22 is installed directly on the ground and the vertical shaft is not required to be excavated, the construction can be simplified, the construction period can be shortened, and the construction cost can be reduced. Since the installation work of (1) and the additional work of the buried pipe 17 described later can be performed on the ground, these works can be performed easily and efficiently.

Next, the work platform 26 is pushed, moved to the boring construction start position, the lock mechanism (not shown) is operated, and the work platform 26 is fixed to the base frame 22. adjust. The position of the propulsion base 28 is adjusted based on the boring construction position, the length of the buried pipe 17 used at the position, and the radius of curvature thereof.
The position on 7 is adjusted vertically and horizontally, and the inclination angle with respect to the horizontal plane, that is, the boring construction angle is adjusted.

For example, when boring is performed from the periphery of the opening of the entrance / exit 10, since the buried pipe 17 having a short size and a small radius of curvature is used as shown in FIG. 1, the propulsion mount 28 is positioned relative to the mouth pipe 33. After being maintained, it is installed in a substantially upright state with respect to the horizontal plane as shown in FIG. On the other hand, when boring is performed from the opening peripheral edge of the mounting passage 12 separated from the entrance / exit 10, since the buried pipe 17 having a longer length and a larger radius of curvature is used as compared with the above-mentioned buried pipe 17 as shown in FIG. The propelling base 28 is installed in an acute-angled state in which the propulsion stand 28 has fallen outward from the state shown in FIG. 6 while maintaining its position relative to the mouth tube 33.

Thereafter, the mouth pipe 33 is attached to the inner end of the base frame 22.
, The embedded pipe 17 is inserted into the pipe 33, and the curved pipe holder 32 holds the embedded pipe 17. Inside the buried pipe 17,
An inner pipe (not shown) is inserted in advance, a vacuumer and a water swivel (both not shown) are attached to the rear end of the pipe 17, and a water supply hose (both not shown) communicating with the water supply pump is attached to the water swivel. Connect.

After such preparatory work, the excavation device is driven, the excavation bit is driven and rotated to start excavation, and the propulsion device 30 is driven to embed the inner pipe 1 in the buried pipe 1.
7 is sent to the drill hole. During excavation, a large amount of water is jetted from the tip of the excavator to cool the excavation bit and
The water jet and the excavated earth and sand are sucked by the vacuumer, guided to the gap between the embedded pipe 17 and the inner pipe, and discharged from the rear end of the embedded pipe 17.

In this case, when the buried pipe 17 having the pipe joint 18 connected to the peripheral surface is used, the drill bit is enlarged to form a drill hole having a diameter larger than the outer diameter of the buried pipe 17. At that time, the work platform 26 is moved by two pitches corresponding to the buried pitch of the buried pipe 17, and after the buried pipe 17 is buried at the position, the work platform 26 is moved between the buried pipes 17 and 17 after the completion of the embedding. , The adjacent pipe joints 18 and 18 are connected to each other, and the buried pipe 1
7 is promoted and buried.

In this way, when the first buried pipe 17 is propelled for a predetermined distance, the water swivel attached to the pipe 17 is removed, and the buried pipe 17 for addition, which is placed by incorporating the inner pipe in advance, is placed on the rear side of the propulsion device 30. Set, connect the hydraulic hoses, and then connect the inner pipe. The buried pipe 17 thus set is welded and connected after aligning its pipe end with the pipe end of the preceding buried pipe 17. In this case, since the work platform 26 is installed on the ground, the work of adding the buried pipe 17 can be performed easily and efficiently as compared with the case where it is installed in the shaft.

Thereafter, by repeating the above work and gradually increasing the number of buried pipes 17 and sequentially feeding them into the natural ground 7, the tip of the buried pipe 17 reaches the other entrance 11 or the planned opening site of the mounting passage 13. , Where this protrudes above the ground,
The propulsion for the buried pipe 17 is completed. After that, the front conduit is removed from the protruding side and collected, and the inner pipe is pulled out through the hydraulic holder of the propulsion device 30. As shown in FIG. 7, the buried pipe 17 is left behind and buried in the ground 7, Both ends thereof are positioned at the planned opening positions.

After burying the buried pipe 17 of a predetermined length in this way, the locking action of the locking mechanism is released, the constraint between the work platform 26 and the base frame 22 is released, and the work platform 26 is moved to the next boring construction position, that is, After moving to the construction position adjacent to the preceding construction position, the lock mechanism is operated again to restrain the work platform 26 to the base frame 22. In addition, the installation position and angle of the propulsion stand 28 are adjusted based on the boring construction position, the length of the buried pipe 17 used, and the radius of curvature thereof, and the mouth pipe 33 is attached to the inner end of the base frame 22. After connecting, the embedded pipe 17 is inserted into the pipe 33 and held by the curved pipe holder 32.

After that, the work platform 26 is sequentially moved along the guide rails 24, and the position and angle of the propulsion device 30 are sequentially adjusted via the propulsion platform 28 so that a predetermined number of the buried pipes 17 are installed.
As described above, the underpass 9 is embedded in a ring shape in the circumferential direction. In this way, each buried pipe 17 will be underpass 9
Are buried in the ground 7 along the lengthwise direction, their longitudinal cross-section is gently curved downward based on each radius of curvature, and their pipe ends are, as shown in FIG. 1
It is arranged in a ring shape at the planned opening locations of 0 and 11.

In this case, since the buried pipe 17 is press-fitted into the surrounding ground, even if the buried pipe 17 is subjected to a natural load, a top load, earth pressure, etc., a stumbling occurs between the buried pipe 17 and the natural ground 7. Nonetheless, the buried pipe 17 strengthens the natural ground 7. At this time, after filling the buried pipe 17, a filling member 20 such as concrete or mortar is injected, or a reinforcing member 21 is embedded inside the filling member 20 to form a solid structure as shown in FIGS. 11 and 12. , The strength of the buried pipe 17 is further enhanced,
The ground 7 is further strengthened.

In this way, when the predetermined number of buried pipes 17 have been buried, the base frame 22 and the work platform 26 are removed, and the entrances / outlets 10 and 11 of the underpass 9 or the mounting passages 12 and 1 are removed.
The natural ground 7 is excavated from one or both sides of 3. In this case, the excavation may be performed along the buried pipe 17 only on the natural ground 7 surrounded by the pipe 17, and the amount of the excavation is underpass 9
Although it is larger than the volume of the inner cross-section, it is much smaller than the amount of excavation divided by the imaginary line in Fig. 14 using the conventional pipe roof construction method. Sufficiently, this type of excavation work can be rationalized, the excavation time can be greatly shortened, the construction period can be shortened and the construction cost can be reduced, and the excavation work can be miniaturized.

Also, the underpass 9 and the mounting passage 1
Since the curved pipe-shaped buried pipes 17 are arranged around the circumferences of the pipes 2, 13 in comparison with the structure in which the straight pipes are buried in the top end portion as in the conventional pipe roof construction method, the buried pipes 17
The contact area between the ground and the ground 7 is increased, the support strength of the ground 7 is strengthened, the collapse thereof is prevented, and the underpass 9 and the mounting passages 12 and 13 can be simultaneously excavated.
Compared with the deep digging structure that makes full use of the vertical shaft, excavation work can be performed easily and quickly.

Along with the excavation of the natural ground 7, the supporting works 34 are assembled in the excavating portion in a ring shape and arranged at a predetermined interval to support the buried pipe 17. This situation is shown in Figure 1.
4 and 15, this prevents deformation of the buried pipe 17 and collapse of the ground 7.

Next, a formwork of a predetermined shape is assembled between the supporters 34, 34, or an existing formwork is carried in, concrete is driven between the formwork and the buried pipe 17, and the inner surface of the underpass 9 is The lining walls 14, 1 are provided on the peripheral surfaces of the mounting passages 12, 13.
5 and 16 are formed. In this case, since the underpass 9 and the mounting passages 12 and 13 can be lined at substantially the same time, the liner work can be rationalized.

After that, pavement concrete (not shown) is placed on the bottom of the underpass 9 and the road surfaces of the mounting passages 12 and 13, and when the underpass 9 is exclusively for passers-by except vehicles, the slope is appropriately adjusted. If the stairs are installed, a series of work is completed.

The underpass 9 thus constructed is shown in FIG.
2, the underpass 9 and the mounting passages 12, 13
A buried pipe 17 is arranged in a ring shape on the outside of the lining walls 14, 15 and 16, and the buried pipe 17 is arranged along the length direction of the underpass 9 so as to be gently curved downward.
Therefore, since the surroundings of the underpass 9 and the mounting passages 12 and 13 are supported by the buried pipe 17 to reinforce the relevant portion, compared with the conventional pipe roof construction method in which only the top end portion is reinforced, The strength of the entire underpass 9 is strengthened and the strength of the mounting passages 12 and 13 is strengthened.

Further, since the buried pipe 17 is formed in a curved pipe shape, the contact area between the buried pipe 17 and the natural ground 7 is increased as compared with the conventional pipe roof construction method in which a straight pipe is buried. Therefore, a robust structure can be obtained. Moreover, since the amount of soil covered by the underpass 9 is small, the entrance / exit 10 and 1
Since the length of the mounting passages 12 and 13 connecting from 1 to the ground can be shortened, it is advantageous for construction in urban areas and residential dense areas where it is difficult to acquire land for the passages 12 and 13, and the construction period and construction cost can be reduced. Can be achieved.

On the other hand, the tunnel construction apparatus of this embodiment is
Work platform 26 on which the curved boring device 29 can be installed
Is installed at the planned opening of the underpass 9 on the ground, and its position can be adjusted along the periphery of the opening, so that the work platform 26 can be easily installed and removed, and the position of the boring can be accurately adjusted. Can be installed in

[0062]

As described above, according to the structure of the tunnel of the present invention, the curved tubular buried pipe is buried in the length direction of the tunnel, and the pipe is arranged over the entire circumference of the tunnel. Compared with the conventional pipe roof construction method in which a straight pipe is partially buried, the contact area between the ground and the buried pipe is increased, and the strength is uniform over the entire tunnel, resulting in a solid structure. There is an effect to be obtained. In the structure of the tunnel of the present invention, since the curved tubular buried pipe buried in the tunnel is extended around the mounting passage connecting from the entrance of the tunnel to the ground, it is possible to strengthen the ground around the tunnel and the mounting passage. There is an effect that the excavation of the part can be performed safely and a solid structure can be obtained. Further, the structure of the tunnel of the present invention, over the entire circumference of the tunnel that curves downward,
Since the buried pipe that bends downward is buried, it is suitable for an underpass or an underground passage. The tunnel structure of the present invention has an effect suitable for, for example, an underpass or a small-scale tunnel because a buried pipe that curves upward is buried over the entire circumference of the tunnel that curves upward. In the structure of the tunnel of the present invention, since the filling member is filled in the buried pipe, the strength of the buried pipe is enhanced, and a stronger structure can be obtained. The structure of the tunnel of the present invention is such that the filling pipe is filled with the filling member and the reinforcing member is embedded in the filling member.
There is an effect that the strength of the buried pipe is further strengthened and a stronger structure can be obtained. As described above, the method of constructing a tunnel of the present invention is to dig a curved drill hole along the length direction of the tunnel over the entire circumference of the tunnel, and after burying a curved tubular buried pipe in the drill hole, Since the ground that is surrounded by the buried pipe is excavated, the entire face can be stabilized, and the excavation of the ground is kept to the minimum necessary, streamlining the excavation and shortening the construction period compared to the conventional pipe roof construction method. There is an effect that the cost reduction and the construction cost can be achieved. Further, in the method of constructing a tunnel of the present invention, a curved excavation hole is extended around a mounting passage communicating from the entrance of the tunnel to the ground, and a buried pipe is buried in the excavation hole along the tunnel and the mounting passage. However, since it is possible to excavate the ground of the tunnel and mounting passage surrounded by these buried pipes,
The tunnel and mounting passage can be excavated safely and rationally, and the construction period can be shortened. Furthermore, the method of constructing a tunnel of the present invention is such that a plurality of excavation holes curved downward along the length direction of the tunnel are excavated over the entire circumference of the tunnel, and a buried pipe curved downward is embedded in the excavation holes. Therefore, for example, it is suitable for underpasses and underpass construction. Since the tunnel construction method of the present invention excavates a plurality of excavation holes that curve upward along the lengthwise direction on the outer periphery of the tunnel, and embeds the buried pipe that curves upward in the excavation holes, for example, underpass or It is suitable for construction of small-scale tunnels. The tunnel construction method of the present invention is
A vertical shaft is excavated at a planned entrance / exit of the tunnel, a curved drill hole is drilled from the vertical shaft in the length direction of the tunnel, and a curved buried pipe is buried in the drill hole. There is a suitable effect for building. The method of constructing a tunnel of the present invention, the entrance and exit of the tunnel, from the ground opening planned position of the mounting passage connecting to the ground from the entrance, excavate a curved drill hole in the length direction of the tunnel and the mounting passage, Since a curved buried pipe is buried in the drill hole, boring of the drill hole and laying of the buried pipe can be performed easily and rationally, and the tunnel surrounded by the buried pipe is compared to the method of constructing a tunnel using a vertical shaft. It is possible to safely and rationally excavate the ground of the mounting passage, and it is suitable for construction of an underpass with a shallow earth cover, for example. As described above, the tunnel building apparatus of the present invention has a work platform installed in a vertical shaft provided at the entrance / exit of the tunnel, and the platform is vertically adjustable and movable in a direction orthogonal to the length direction of the tunnel. Since it is provided, it is suitable for construction of an underpass with a deep soil cover, and drilling of an excavation hole and burial of a buried pipe can be performed accurately. Further, in the tunnel building apparatus of the present invention, the work platform is installed at the planned opening position on the ground between the entrance and exit of the tunnel and the mounting passage connecting to the ground from the entrance, and the mount can be installed at the boring construction position. Therefore, it is suitable for construction of an underpass with a shallow soil cover, and boring construction and embedding of a buried pipe can be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to a shallow tunnel (underpass) with a soil cover.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, which is slightly enlarged.

FIG. 3 is a plan view of FIG.

FIG. 4 is a plan view showing a part of FIG. 3 in an enlarged manner, showing an inlet and outlet on one side of an underpass and a mounting passage.

FIG. 5 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the method of the present invention, showing a situation where a work platform is installed at a planned opening of the entrance of an underpass and an installation passage.

FIG. 6 is a front view showing an embodiment of the tunnel building apparatus of the present invention, showing a situation where the tunnel entrance and exit and installation paths thereof are installed at planned ground openings.

FIG. 7 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the method of the present invention, showing a situation in which a buried pipe is buried in a ground from a work platform installed on the ground.

FIG. 8 is a cross-sectional view taken along line BB of FIG. 7, which is slightly enlarged.

9 is a cross-sectional view showing an enlarged main part of FIG.

FIG. 10 is a front view showing an embodiment of a buried pipe applied to the present invention.

FIG. 11 is a cross-sectional view showing another embodiment of the buried pipe applied to the present invention.

FIG. 12 is a sectional view showing another embodiment of the buried pipe applied to the present invention.

FIG. 13 is a vertical sectional view showing a process of constructing a tunnel by applying the method of the present invention, showing a situation in which the ground of the tunnel and the mounting passage is excavated.

FIG. 14 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the method of the present invention, showing a situation in which support work is performed in the mine after excavating the ground of the tunnel and the mounting passage.

FIG. 15 is a cross-sectional view taken along the line CC of FIG. 14, which is slightly enlarged.

FIG. 16 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the method of the present invention, showing a state in which a lining wall is formed on the inner surface of the tunnel.

FIG. 17 is a cross-sectional view showing another embodiment of the present invention, which is a cross-sectional view showing an embodiment applied to a tunnel (underpass) having a deep soil cover.

FIG. 18 is a vertical cross-sectional view showing the process of constructing a tunnel by applying the other embodiment described above, showing a situation in which a vertical shaft has been excavated at the entrance and exit of the tunnel.

FIG. 19 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the other embodiment described above, showing a situation in which a work platform is installed in a shaft on one side.

FIG. 20 is a front view showing an example of a tunnel building apparatus applied to another embodiment.

FIG. 21 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the other embodiment described above, showing a situation in which a buried pipe is buried from the work platform in the shaft to the ground.

FIG. 22 is a vertical cross-sectional view showing a process of constructing a tunnel by applying the other embodiment described above.
Shows the situation where the support work was constructed in the mine.

FIG. 23 is a vertical sectional view in which the present invention is applied to a small-scale tunnel that curves upward.

FIG. 24 is a vertical cross-sectional view of a tunnel showing a conventional pipe roof construction method.

[Explanation of symbols]

 7 Ground 9,44 Tunnel (underpass) 10,11 Entrance / exit 12,13 Installation passage 17 Embedded pipe 20 Filling member 21 Reinforcing member 26 Work platform 29 Curve boring device 30 Propulsion device 35, 36 Vertical shaft

Front Page Continuation (72) Inventor Masayuki Yamashita 2-5-3 Misakicho, Chiyoda-ku, Tokyo Iron Construction Co., Ltd.

Claims (14)

[Claims] 1. In a tunnel structure in which a plurality of buried pipes are buried along the length of the tunnel, a curved pipe-shaped buried pipe is buried in the length of the tunnel, and the pipe is entirely surrounded by the circumference of the tunnel. The structure of the tunnel, which is characterized by being placed over. 2. A curved tubular buried pipe buried in a tunnel,
The structure of the tunnel according to claim 1, wherein the structure extends from the entrance of the tunnel to the periphery of a mounting passage communicating with the ground. 3. The tunnel structure according to claim 1, wherein a buried pipe that curves downward is buried over the entire outer circumference of the tunnel that curves downward. 4. The structure of the tunnel according to claim 1, wherein an upwardly curved buried pipe is buried over the entire outer circumference of the upwardly curved tunnel. 5. The filling pipe is filled with a filling member.
The structure of the tunnel described in 4. 6. The tunnel structure according to claim 5, wherein a filling member is filled in the buried pipe, and a reinforcing member is buried in the filling member. 7. A method of constructing a tunnel in which a plurality of excavation holes are excavated along a lengthwise direction on the outer periphery of the tunnel, a buried pipe is buried in the drilled holes, and then the ground inside the buried pipe is excavated. A curved excavation hole was excavated along the length of the tunnel over the entire circumference of the tunnel, a curved pipe-shaped buried pipe was buried in the drilled hole, and then a rock ground surrounded by the buried pipe was drilled. A method of constructing a tunnel characterized by that. 8. The curved excavation hole is extended around a mounting passage communicating from the entrance of the tunnel to the ground, and a buried pipe is embedded in the excavation hole over the tunnel and the mounting passage. The method of constructing a tunnel according to claim 7, wherein the tunnel surrounded by the pipe and the ground of the mounting passage are excavated. 9. The method according to claim 7, wherein a plurality of excavation holes curved downward along the length direction of the tunnel are excavated over the entire circumference of the tunnel, and a buried pipe curving downward is embedded in the excavation holes. How to build the tunnel described. 10. The method for constructing a tunnel according to claim 7, wherein a plurality of excavation holes curved upward along the length direction are excavated on the outer circumference of the tunnel, and buried pipes curved upward are buried in the excavation holes. 11. The tunnel according to claim 7, wherein a vertical shaft is excavated at a planned entrance / exit of the tunnel, a curved drill hole is drilled from the vertical shaft in the length direction of the tunnel, and a curved buried pipe is buried in the drill hole. How to build a tunnel. 12. A curved excavation hole is excavated in the length direction of the tunnel and the installation passage from the planned opening position on the ground of the entrance of the tunnel and the installation passage communicating from the entrance to the ground. 8. The tunnel structure according to claim 7, wherein after burying the curved buried pipes, the ground surrounded by the buried pipes and the mounting passage is excavated. 13. A tunnel construction apparatus comprising a work platform on which a curved boring device can be installed, and a propulsion device for the curved boring device is installed on the platform, and the working platform is installed in a vertical shaft provided at an entrance / exit of the tunnel. A tunnel construction device in which a pedestal is installed so that its vertical position can be adjusted, and it is also movable in a direction orthogonal to the length direction of the tunnel. 14. A tunnel construction apparatus comprising a work platform on which a curved boring device can be installed, and a propulsion device for the curved boring device installed on the platform, and an entrance / exit of the tunnel and an attachment passage communicating from the entrance to the ground. A construction device for a tunnel in which a work platform is installed at a planned opening position on the ground and the platform can be installed at a boring construction position.