JPH08326471A - Layout method of underground embedded body and preceding hole excavating device - Google Patents

Abstract

PURPOSE: To lay out an embedded body swiftly and secure the safety of construction work swiftly and further shorten a construction period and excavate a preceding hole rationally and move the embedded body more smoothly and hence reduce moving force. CONSTITUTION: There is installed a post-like embedded body 4 mounted with an excavating device on one end. A preceding hole is excavated in the direction intersecting with a structure 2 at right angles. Excavated earth and sand are discharged outside the preceding hole while the embedded body 4 is moved along the preceding hole and constructed, thereby installing a plurality of embedded bodies side by side. The embedded body 4 is rectangular-shaped in cross section while the preceding hole is excavated in the shape of rectangular cross section and is larger-sized than the embedded body 4. The longer sides of the preceding hole 4 are excavated along the preceding hole and laid out in the laying out direction of the round structure 2 in parallel to the preceding hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
A method of laying an underground buried body that ensures the safety of construction promptly and shortens the construction period, and reasonably excavates the guide hole to facilitate the movement of the buried body and reduce the moving force. The present invention relates to a leading hole drilling device.

[0002]

2. Description of the Related Art Conventionally, in the case of constructing a waterway or an underpass underground, for example, in Japanese Examined Patent Publication No. 51-22731, horizontal boring is carried out from the starting shaft to the target position of the reaching shaft, and the ground is penetrated to form a boring hole. Insert the PC steel wire into the, connect one end of the steel wire to the underground buried object, and connect the other end to the tow jack installed in the reaching shaft, operate the jack, and put the underground buried object into the ground. It was pulled in and moved, and at that time, pressure water or pressure air was jetted from the jet pipe arranged at the tip blade edge to relax the surrounding ground and reduce the penetration resistance of underground buried objects.

However, while this method can accurately pull the buried object, it penetrates the underground buried object while pressing the natural ground, and since the cross-sectional shape of the underground buried object is larger than the excavated cross section of the cutting edge, the buried object is buried. There is a problem that the movement resistance of the object is large, a large-capacity towing jack is required, and the excavation hole is cut when the buried object is moved, and the ground is loosened or the ground is submerged.

On the other hand, in Japanese Examined Patent Publication No. 55-50557, an excavation tip pipe is attached to the tip of an underground buried object, a screw auger is rotatably arranged inside these, and a cutter is rotatably provided at the tip of the auger. The excavation tip pipe penetrates into the ground from the starting shaft, the front side of the excavation tip pipe is excavated in a cross section having the same shape as the embedding matter, the buried object is propelled, and the excavated earth and sand is discharged by the auger.

However, in this method, the shape of the excavated cross-section of the guide hole is limited to a circle or a square, and it takes time to cut the ground and lay the buried object, which lengthens the time and labor required to secure the safety of the work. There was a problem. Especially, this problem is serious in the crossing work under the railroad where the work is done in a strict line closing time, and its improvement has been desired in advance.

[0006]

SUMMARY OF THE INVENTION The present invention solves such a problem, promptly lays a buried body, promptly secures the safety of construction, shortens the construction period, and rationalizes the leading hole. It is an object of the present invention to provide a method for laying an underground buried body and a leading hole excavating device for the underground buried body, which are excavated in the ground to facilitate smooth movement of the buried body and reduce the moving force.

[0007]

Therefore, in the method for laying an underground buried body according to the present invention, a pillar-shaped buried body having an excavation device attached to one end thereof is provided, and a guide is provided directly below the ground structure via the excavation device. The hole is excavated in the direction orthogonal to the above-ground structure, the excavated earth and sand is discharged to the outside of the guide hole, and the buried body is moved and laid along the guide hole, and a plurality of buried bodies are laid side by side. In the method of laying an underground buried body, the buried body is made to have a horizontally long cross-sectional shape, the leading hole is excavated in a horizontally long cross-sectional shape larger than the buried body, and the long side of the leading hole is drilled in parallel with the laying direction of the aboveground structure. Then, the long side of the buried body is arranged in the leading hole in parallel with the laying direction of the above-ground structure to reduce the number of buried bodies and the number of drilling of the leading hole, shortening the construction period of this kind of work and cutting the edge. In addition to speeding up, reducing construction costs and ensuring construction safety promptly, burial And smooth and accurate movement of, and to reduce the moving force of the buried body. In addition, the method of the present invention can realize a construction in which the buried body has a horizontally long rectangular cross-sectional shape and the leading hole is excavated in a horizontally long rectangular cross-sectional shape larger than the buried body to shorten the construction period and speed up the edging. I have to.
Further, the method of the present invention sucks and discharges the excavated earth and sand, and discharges the conventional screw auger to simplify the structure and ensure reliable and smooth soil discharge. The guide hole excavating device for an underground buried body of the present invention provides a buried body to be laid in a guide hole excavated in the ground, detachably attaches a leading conduit to one end of the buried body, and drills a leading hole in the leading conduit. In addition to being equipped with a possible excavation device, a pair of cutter arms can be rotated horizontally and vertically in the leading conduit in a leading hole excavation device for an underground buried object that has a discharge path for excavated earth and sand inside the buried object. A cutter drum is rotatably provided at the tip of the cutter arm, the cutter drum is provided so as to project outward from the peripheral surface of the leading conduit, and a leading hole having a laterally long cross section can be drilled, and the leading hole is provided in the leading conduit. The excavation is carried out in a larger size than that of the buried body so that the buried body can be moved smoothly and accurately and the moving force of the buried body can be reduced. Further, in the device of the present invention, an earth discharging pipe capable of sucking excavated earth and sand is piped inside the buried body, and one end of the pipe is arranged behind the excavator to simplify the structure and ensure smooth and reliable excavated earth and sand. I try to carry it out. Further, the device of the present invention is provided with a lock pin capable of locking the front conduit and the embedded body, and an elastically deformable spring piece is attached to the pin, and when the spring piece is elastically deformed, the spring piece is first moved. It is provided so as to be engageable with a spring receiver provided in the conduit so that the work of attaching and detaching the leading conduit and the embedded body can be performed easily and quickly.

[0008]

[Operation] According to the invention of claim 1, the buried body has a horizontally long cross-sectional shape, the long side of the leading hole is excavated in parallel with the laying direction of the ground structure, and the long side of the buried body is grounded in the leading hole. Arranged parallel to the laying direction of the structure, reducing the number of buried bodies and the number of excavation of lead holes, shortening the construction period of this kind of construction and speeding up edge cutting, reducing construction cost and safety of construction To secure the property promptly. In addition, the guide hole is excavated in a laterally elongated cross-sectional shape larger than the embedded body to achieve smooth and accurate movement of the embedded body and reduction of the moving force of the embedded body. According to the invention of claim 2, the buried body has a horizontally long rectangular cross-sectional shape, and the leading hole is excavated in a horizontally long rectangular cross-sectional shape larger than the buried body, thereby realizing work that can shorten the construction period and speed up the edging. . According to the invention of claim 3, the excavated earth and sand are sucked and discharged, the conventional screw auger is discharged, the structure is simplified, and the excavated earth and sand is smoothly and surely discharged. Claim 4
In the invention, a pair of cutter arms is rotatably provided in the front conduit in a horizontal and vertical direction, a cutter drum is rotatably provided at the tip of the cutter arm, and the cutter drum is provided outside the peripheral surface of the front conduit. It is provided so that it can project, and it is possible to excavate the guide hole with a laterally long cross section, and the guide hole is excavated in a larger size than the guide conduit, and smooth and accurate movement of the buried body,
Aim to reduce the moving force of the buried body. According to the invention of claim 5, an earth discharging pipe capable of sucking excavated earth and sand is arranged inside the buried body, one end of the pipe is arranged behind the excavating device, and the conventional screw auger is discharged to simplify the structure. The smooth and reliable removal of excavated soil will be promoted. According to a sixth aspect of the present invention, a lock pin capable of locking the leading conduit and the embedded body is provided, and an elastically deformable spring piece is attached to the pin. It is provided so as to be engageable with the spring receiver provided in the above, and the work of attaching and detaching the leading conduit and the buried body can be performed easily and quickly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment in which an underpass is constructed in the transverse direction under a railroad track. In FIGS. 1 to 9, 1 is a ground with a rail 2 which is a ground structure laid on the outer surface. A plurality of buried pipes 4 as underground buried bodies that constitute the underpass 3 are buried in the inside thereof in parallel with each other in the direction orthogonal to the rail 2.

The buried pipe 4 is composed of a long steel pipe having a horizontally long rectangular cross section or concrete, and has an aspect ratio of approximately 1: 2, and its shape and dimension are those of the conventional rectangular cross section. It is equivalent to two horizontal rails, the long side of which is arranged in parallel with the rail 2 as shown in FIG. 1, and a guide rail (not shown) is projectingly provided on the short side of the rail along the length direction. The laying of the buried pipe 4 is guided.

A mounting frame 5 having a horizontally long rectangular cross section, which constitutes a part of a leading conduit, which will be described later, is inserted into the distal end of the buried pipe 4, and these are detachably mounted via a plurality of lock pins 6. . That is, as shown in FIG. 5, a plurality of through holes 7 are formed on the peripheral surface of the distal end portion of the buried pipe 4, and a lock pipe 8 as a spring receiver is attached to a mounting frame 5 corresponding to the holes 7. The lock pin 6 is inserted into the through hole 7, and the head portion 6a thereof is housed inside the lock pipe 8,
It engages with the inner opening edge of the through hole 7.

A lock bolt 9 is screwed into the inside of the lock pin 6, and a spring piece such as a disc spring 10 or a spring washer that is elastically deformable to the outside is inserted between the bolt 9 and the lock pin 6. When screwing the lock bolt 9, the disc spring 1
0 is elastically deformed to expand its diameter, and its side peripheral surface is locked with a lock pipe 8
The mounting frame 5 is connected to the embedded pipe 4 by pressure contact with the inner surface of the.

A front conduit 11 is fixed to the tip of the mounting frame 5, and the pipe 11 is formed to have the same sectional shape as that of the buried pipe 4, and a notch 1 is formed on both sides of the tip of an upper piece 11a thereof.
2 is formed so as to avoid interference of a cutter arm described later, and a wide notch 13 is formed at the center of the tip of the lower piece 11b so that an excavated sand pool can be formed inside thereof.

The pin 1 is provided on the inner surface of the upper portion of the mounting frame 5.
A pair of revolving cylinders 15 are connected to each other via 4 and 14 so that they can be operated synchronously, and rocking levers 18 and 18 can be horizontally rocked via pins 17 and 17 at the tips of piston rods 16 and 16, respectively. It is connected.

A tip end of the swing lever 18 is cut out in a rectangular shape, a box-shaped link 19 is fixed to the cutout portion 18a, and a pivot 20 is projected downward from the inner surface of the top end portion of the mounting frame 5. A box-shaped link 19 is rotatably supported on the pivot 20. Box-shaped link 19 has pin 21
A pair of brackets 22 are rotatably connected in the vertical direction via, and a cutter arm 23 is attached to the tip of the bracket 22.

The cutter arms 23 are arranged on both sides of the front conduit 11, and a gear mechanism for transmitting power from a cutter drum driving motor, which will be described later, to the cutter drum is housed inside the front end of the front conduit 11. It projects forward and a pair of cutter drums 24 is rotatably supported at its tip. The cutter drum 24 is formed in a substantially spherical shape, and a large number of cutter bits (not shown) are projected on the peripheral surface thereof. When the cutter arm 23 swings outward in the horizontal direction, as shown in FIG. The leading hole 25, which is wider than the leading conduit 11 and protrudes outward in the width direction, can be excavated, and when swinging inward in the horizontal direction, the leading hole 25 can be moved to the center of the leading conduit 11 in the width direction.

In the figure, 26 is a motor for driving the cutter drum, which is arranged at the base end of the cutter arm 23, and 27 is a stopper which is provided on the inner surface of the distal end of the leading conduit 11 so as to be engageable with the cutter arm 23. The rotation angle of the arm 23 to the outside is regulated.

On the other hand, the brackets 22 and 2 just below the pin 21
Pins 28, 28 are provided on the inner surface of 2 so as to project inward, and a swing cylinder 29 is connected to these pins 28, 28 so as to be vertically rotatable. It is rotatably connected to the lower end of the piston rod 16 via 42.

The oscillating cylinders 29, 29 can be operated synchronously, the cutter arm 23 is rotated upward when the piston rod 30 is extended, and the piston rod 30 is rotated.
When reducing, the cutter arm 23 is rotated downward so that the cutter drum 24 moves the upper and lower side pieces 11 of the tip conduit 11.
The leading holes 25 are made to be wider than the height of the leading conduit 11 so that the leading holes 25 can be excavated to the outside of a and 11b. Therefore, as shown in FIG. 4, the guide hole 25 is excavated in a horizontally long rectangular cross-sectional shape that is slightly larger than the guide conduit 11 and is long in the laying direction of the rail 2.

Inside the tip of the buried pipe 4, a bottomed auger pipe 31 is obliquely arranged, and in the case of the embodiment, the length of the pipe 31 is slightly shorter than the width of the leading conduit 11, The front end portion disposed on the side is obliquely cut, and the opening is positioned immediately above the notch 13. A screw auger 32 is rotatably housed inside the auger pipe 31, and an auger motor 33 is provided at the shaft end thereof. In the figure, 31a is a connecting pipe projecting from the lower end of the closed end of the auger pipe 31, 34 is a flexible earth discharging pipe having one end connected to the bottom of the auger pipe 31, and the other end is connected to a vacuum pump (not shown), The excavated soil can be carried out to the starting shaft side.

In addition, reference numeral 35 in the drawing denotes an abutment standing upright at the entrance / exit of the underpass 3, in which the buried pipes 4 vertically stacked are embedded, and the main girder is provided between the upper ends of the abutments 35, 35. 36 is erected, and a roadbed 37 is placed between the lower ends of the abutments 35, 35.
And the pavement portion 38 is laid on the roadbed 37.

FIG. 6 and FIG. 7 show a second embodiment of the present invention, and the same reference numerals are used for the portions corresponding to the above-mentioned constitution. In this embodiment, instead of the screw auger 32, a substantially trumpet-shaped partition wall 39 is fixed to the inner surface of the intermediate portion of the mounting frame 5, and the wall 39 has a diameter reduced in the carrying-out direction of excavated earth and sand, and the lower side thereof. Connect one end of the soil discharge pipe 34 to the smallest diameter portion arranged in the above, connect the other end to a vacuum pump (not shown), omit the screw auger 32, reduce the equipment cost by that amount, and simplify the configuration. In addition, the work is prevented from being interrupted due to the failure of the auger 32.

In the figure, reference numeral 40 is a vibrator installed on the outer surface of the partition wall 39 for promoting the separation and movement of the sand, and 41 is a sprinkler pipe installed directly above the discharge pipe 34, and its spray port is provided at the partition wall. It is possible to sprinkle the excavated sand toward the inside of 39.

FIG. 8 shows a third embodiment of the present invention. In this embodiment, instead of excavating the guide hole 25 in a substantially horizontally long rectangular cross section, the operation of the swing cylinder 15 and the swing cylinder 29 is controlled to guide the lead. The excavated section of the hole 25 is excavated into an oval shape that is long in the laying direction of the rail 2, and the sectional shape of the leading conduit 11 is formed to be a slightly smaller shape than that of the leading hole 25. The number of drilling holes 25 that are drilled in the laying direction of 2 is reduced as much as possible to shorten the construction period of the construction work, and the ground 1 is quickly edged to ensure the safety of the construction work promptly. ing.

FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, instead of excavating the guide hole 25 to have an oval cross section as in the third embodiment, the swing cylinder 15 and the swing cylinder 29 are used.
The operation is controlled to excavate in a cocoon shape that is long in the laying direction of the rail 2, and this shape corresponds to a shape in which two of the oval cross sections are placed sideways, and the cross sectional shape of the leading conduit 11 is also the above leading shape. Hole 2
Underpass 3 with a similar shape slightly smaller than 5
During construction, the number of guide holes 25 that are drilled in the laying direction of the rail 2 is further reduced to shorten the construction period, and the ground 1 is quickly cut off to secure construction safety promptly. I am trying to do it.

When the underpass 3 is constructed below the rail 2 which is an above-ground structure, using the excavating method and the excavating device for the underground hole for the underground buried object constructed as described above,
In the embodiment, the starting shaft and the reaching shaft are excavated at predetermined positions sandwiching the rail 2, and the excavated surfaces are retained by an appropriate means.

Next, in the starting shaft, the buried pipe 4, the front conduit 11 integral with the mounting frame 5, the screw auger 32,
The earth discharging pipe 34, a known propulsion device or a towing jack (not shown) that is a moving force source of the buried pipe 4, and in the embodiment, the propulsion device is carried in and assembled. Of these, a pair of revolving cylinders 15, a pair of rocking cylinders 29, a pair of cutter arms 23, a cutter drum 24, a lever 18, and a cutter drum driving motor 26 are preassembled on the mounting frame 5. , The frame 5 is inserted into the end of the buried pipe 4.

Then, the position of the lock pipe 8 is aligned with the through hole 7, the lock pin 6 is inserted into the through hole 7 from the inside of the lock pipe 8, and the lock bolt 9 having the disc spring 10 mounted therein is screwed into the pin 6. Tighten. By doing so, the embedded pipe 4 and the mounting frame 5 are connected by the lock pin 6, and the disc spring 10 is crushed and elastically deformed, and its outer diameter increases and engages with the inner surface of the lock pipe 8. However, the frictional force prevents the lock pin 6 from falling off and maintains the connection.

Thereafter, one end of the earth discharging pipe 34 is connected to the connecting pipe 31a of the auger pipe 32, the other end thereof is connected to a vacuum pump (not shown), and the screw auger 32 is attached inside the attachment frame 5. The other end of the buried pipe 4 is connected to a propulsion device (not shown) installed in the starting shaft.

The buried pipe 4 and the leading conduit 1 assembled in this way
1 and 2 to a predetermined position on the side of the starting shaft to position the cutter drums 24, 24 at predetermined positions on the natural ground 1,
These are set to, for example, their lowermost positions via the swing cylinders 29, 29, and to the outermost positions in the horizontal direction, for example, via the turning cylinders 15 and 15. And
A propulsion device (not shown) is driven to drive the cutter drums 24, 2
4 is pressed against natural ground 1, and before and after this, turning cylinder 1
5, 15 and motors 26, 26 for driving the cutter drum
And drives the auger motor 33, a vacuum pump (not shown), and the like.

Of these, when the revolving cylinders 15 and 15 operate, their piston rods 16 and 16 extend,
A swing lever 18, 18 pivotally attached to the tip of the pivot shaft 20,
It rotates horizontally around 20 as a fulcrum, and the box-shaped link 1
The cutter arms 23, 23 rotate inwardly of the leading conduit tube 11 by the movement of the members 9, 9. Therefore, the cutter drum 2
4, 4 and 24 draw an arc around the pivots 20 and 20 as shown in FIG. 2, move from the outside to the center of the inside of the front conduit 11, and excavate the natural ground 1 around the lower front part of the front conduit 11. .

When the piston rods 16 and 16 are extended to the maximum length, the cutter arms 23 and 23 are moved to the positions of the phantom lines in FIG. 2, and the cutter drums 24 and 24 are moved to the center position inside the leading conduit 11. In this state, the rocking cylinders 29, 29 are operated to adjust the height positions of the cutter drums 24, 24 while maintaining this state. In this case, the rocking cylinders 29, 29 are the turning cylinders 15, 1.
Along with the operation of 5, the bracket 22 connecting them,
Piston rod 1 in which the tip of piston rod 30 is connected
Under the above-mentioned circumstances, the cutter arms 23, 23 are located in a substantially C-shape as shown in FIG. 2, and the swing cylinders 29, 29 are located under this coaxial line. .

Then, when the rocking cylinders 29, 29 are actuated to extend the piston rods 30, 30 by a predetermined displacement, the rocking cylinders 29, 29 pivotally attached to their base ends.
Moves downward, and the pins 28, 28 move together therewith, so that the brackets 22, 22 integral with the pins 28, 28 move to the pin 2
Rotate upward around 1, 21.

Therefore, the brackets 22 and 22 are attached to the pin 2
Rotate upwards around 1 and the cutter arm 2
The cutter drum 24 moves upward by the movement of the cutters 3, 23. In this case, the cutter drum 24 is adjusted to a height that does not cause uncut residue in the guide hole 11.

In this way, when the height positions of the cutter drums 24, 24 are adjusted, the swiveling cylinders 15, 15 are actuated to reduce the piston rods 16, 16. In this way, the rocking levers 18, 18 are attached to the pivot 2
It rotates horizontally about 0 and 20 as a fulcrum, and the box-shaped links 19 and 19 move together with it, and the cutter arms 23 and 23 rotate outward of the leading conduit 11. For this reason, the cutter drums 24, 24 draw an arc around the pivots 20, 20 as shown in FIG. 2 and move from the center position inside the leading conduit 11 to the outside, around the front middle lower part of the leading conduit 11. Drill ground 1.

Then, the piston rods 16 and 16 are contracted to the shortest, the cutter arms 23 and 23 move to the positions shown by the solid lines in FIG. 2 and contact the stoppers 27 and 27, and the cutter drums 24 and 24 return to their original positions. By the way, maintaining this state, the rocking cylinders 29, 29 are operated under this condition, and the height positions of the cutter drums 24, 24 are adjusted.

The height of the cutter drums 24, 24 can be adjusted by
After the adjustment, the turning cylinders 15 and 15 are actuated to extend the piston rods 16 and 16 again to rotate the swing levers 18 and 18 in the same manner as described above.
In this way, the box-shaped links 19 and 19 move together with the swing levers 18 and 18, the cutter arms 23 and 23 rotate inside the leading conduit 11, and the cutter drums 24 and 2
4, the drums 24, 24 move from the outside to the center of the inside of the leading conduit 11 and excavate the natural ground 1 around the front middle upper part of the leading conduit 11.

When the piston rods 16 and 16 are extended to the maximum length, the cutter arms 23 and 23 are moved to the positions of the phantom lines in FIG. 2, and the cutter drums 24 and 24 are moved to the center position inside the leading conduit 11. In this state, the rocking cylinders 29, 29 are operated to adjust the height positions of the cutter drums 24, 24 while maintaining this state.

After that, the height adjustment of the cutter drums 24 and 24 and the turning operation of the drums 24 and 24 are alternately repeated to gradually raise the height of the cutter drums 24 and 24, and the height of the guide hole 25. Gradually expand. Then, the cutter drums 24, 24 are set to the highest position, and this position is located above the upper piece 11a as shown in FIG.
This is the final adjustment process, turning in the horizontal direction,
Drill rock 1 around the top of No. 5.

The leading hole 25 thus excavated is shown in FIGS.
As described above, the cross section is larger than the leading conduit 11 and its cross-sectional shape is substantially similar to that of the leading conduit 11 and is formed in a slightly larger laterally elongated rectangle. Therefore, friction between the inner surface of the guide hole 25 and the buried pipe 4 is reduced, and the moving force of the buried pipe 4, that is, the propulsion force of the propulsion device can be reduced. As a result, the remaining uncut portion, the increase in the propulsive force or the traction force due to the movement of the leading conduit or the buried pipe under the uncut portion, and the leading hole when the buried pipe 4 is moved are scraped, which is caused. It does not cause problems such as ground subsidence.

Moreover, when excavating the guide hole 25, the cutter arms 23, 23 are moved toward and away from each other, that is, by excavating by rotating in different directions. Therefore, the arm 23, 23 is swung in the same direction for excavating. Compared with the above, the horizontal component force of excavation vibration and impact acting on the cutter arms 23, 23 can be canceled, and the moving direction of the leading conduit 11 by the propulsion device can be stabilized accordingly. These effects are the same when the buried pipe 4 is pulled.

When the leading hole 25 is excavated in this way, the excavated earth and sand is discharged to the rear of the cutter drum 24, and most of it remains in the vicinity of the notch 13 and is conveyed to the closed end side by the auger screw 32. The pipe is guided to the soil discharge pipe 34 by suction from the section and is moved in the pipe by suction to be discharged to the starting shaft side.

In this case, since the auger screw 32 is short and small and lightweight, compared with the conventional method of storing the long auger screw in the buried pipe 4 and carrying out the excavated earth and sand,
It is possible to reduce the capacity of the auger motor 33 and reduce the propulsion force of the propulsion device. Further, since the excavated earth and sand is sucked and conveyed from the closed end of the auger pipe 31, the suction action effectively works,
The sediment can be carried out efficiently.

In this way, the leading hole 25 is excavated, and while discharging the excavated earth and sand, the leading conduit 11 is pushed by the propulsion device to advance, and the buried pipe 4 connected to this is moved together. Then, when the leading conduit 11 reaches the reaching shaft and penetrates from the ground 1, the driving of the propulsion device is stopped, and the lock bolt 9 is loosened from the inside of the buried pipe 4. In this way, the coned disc spring 10 recovers its original shape by elasticity, its side peripheral surface separates from the inner surface of the lock pipe 8, the frictional force between them disappears, and the lock pin 6 can be removed.

Then, when the lock pin 6 is pulled out from the through hole 7, the embedded pipe 4 and the mounting frame 5 are separated, and when the tip conduit 11 is pulled out after this, the cutter arms 23 and 23 integrated with the pipe 11 and The cutter drum 24, and further the auger screw 32 and the earth discharging pipe 34 can be removed. As described above, since the disassembling work can be easily performed by the lock pin 6, the next-stage buried pipe 4 can be laid quickly.

After that, the above disassembled parts are carried to the starting shaft and the mounting frame 5 is inserted into one end of a new buried pipe 4,
When this is connected through the lock pin 6 as described above, the assembly of the leading conduit 11 and the buried pipe 4 is positioned at a predetermined position of the starting shaft, that is, the position adjacent to the laid buried pipe 4, and their guide rails ( (Not shown),
The other end of the buried pipe 4 is connected to a propulsion device (not shown).

After such work, the cutter drums 24, 24 are set to their lowest position, for example, via the swing cylinders 29, 29 as described above, and the swiveling cylinders 15, 24 are set.
For example, when the outermost position in the horizontal direction is set via 15, a propulsion device (not shown) is driven to press the cutter drums 24, 24 against the natural ground 1. Further, before and after this, the swiveling cylinders 15, 15, the cutter drum driving motors 26, 26, the auger motor 33, a vacuum pump (not shown), etc. are driven to excavate the leading hole 25 and excavate earth and sand. It is excavated while discharging, and the buried pipe 4 is laid along the existing buried pipe 4 via the guide rail.

Thereafter, the buried pipes 4 are sequentially laid, and a predetermined number of buried pipes 4 necessary for constructing the main girder 36 and the abutments 35, 35 are laterally buried as shown in FIG. These buried pipes 4 are formed in a horizontally long rectangular cross section, and their long sides are arranged in parallel with the laying direction of the rails 2. Therefore, compared with the conventional buried pipe 4 having a rectangular or circular cross section, , The number of buried pipes 4 can be reduced and the number of leading holes 25 can be reduced.
We encourage the shortening of the construction period for this type of construction. In particular, this effect is suitable for the case where priority is given to the speed of construction, such as crossing construction under a railroad, which requires a work during a line closing time.

On the other hand, these buried pipes 4 are arranged immediately below the rails 2 and prevent the loosening of the natural ground 1 and the subsidence of the ground, so that they function as edging members, and the safety of the construction thereafter. It is suitable for crossing work under the railroad in combination with the above.

After that, the buried pipe 4 is laid just under both ends of the buried pipe 4 arranged in the building portion of the main girder 36, and thereafter, a plurality of buried pipes 4 are sequentially arranged so as to overlap with each other and they are guided to each other. When connected by rails, a reinforcing member such as concrete is filled inside the buried pipe 4 as needed to reinforce the strength, and mortar and a water blocking material are filled between each buried pipe 4 and the guide rail. . In this case, since each buried pipe 4 substantially adheres to the adjacent buried pipe 4 to reinforce the underpass 3,
There is no defect between the circular pipe roof pipes juxtaposed as in the conventional case, and the strength of the underpass 3 which is an underground structure can be strengthened to that extent.

A pair of left and right abutments 35, 35 are erected at the entrance / exit of the underpass 3, and a main girder 36 is provided between them.
After erection, the embedded pipe 4 and the main girder 36, and the embedded pipe 4 and the abutment 35 are connected by a PC steel wire, which is tensioned with a jack to apply prestress to support the top load and earth pressure. After that, the ground 1 having an inner sky section divided by the buried pipe 4 is excavated, and after the excavation is completed, the roadbed 38 and the pavement portion 39 are constructed.

If the excavation device breaks down during the digging of the buried pipe 4, the operator is made to dive into the buried pipe 4, the swing cylinders 15 and 15 and the swing cylinders 29 and 29 are operated, and the cutter drum 24 is operated. , 24 are moved to the inside of the front conduit 11, the excavator and the mounting frame 5 can be taken out from the inside of the buried pipe 4. Therefore, if the excavator and the mounting frame 5 are pulled out to the starting shaft side by making full use of a jack or a winch, the faulty excavator can be taken out and the above situation can be dealt with promptly. It will be possible to restart the construction by repairing it.

[0053]

As described above, the method for laying an underground buried body according to the present invention has a structure in which the buried body has a laterally long cross-sectional shape, the leading hole is excavated into a laterally long cross-sectional shape, and the long side of the leading hole is a ground structure. Excavation was carried out in parallel with the laying direction, and the long side of the buried body was arranged in the guide hole in parallel with the laying direction of the ground structure. It is possible to reduce the number of layings and the number of leading holes to be drilled, shorten the construction period of this type of construction, and speed up the edge cutting, thus reducing the construction cost and ensuring the safety of construction promptly. Especially this effect is
It is suitable for under-rail crossing work where the work is done during strict closing times. In addition, since the guide hole is excavated in a laterally elongated cross-sectional shape larger than the embedded body, the friction between the embedded body and the guide hole is reduced to reduce the movement resistance of the embedded body, and the embedded body can be smoothly and accurately moved. The moving force can be reduced. Therefore, it is possible to reduce the capacities of the propulsion device and the traction device, which are the power source of the buried body, and to promote the reduction of the equipment cost of this kind of construction. According to the method of the present invention, the buried body has a horizontally long rectangular cross-sectional shape, and the leading hole is excavated into a horizontally long rectangular cross-sectional shape larger than the buried body, so that the work period can be shortened and the edging can be speeded up. be able to. According to the method of the present invention, since the excavated earth and sand are sucked and discharged, the conventional screw auger is discharged to simplify the structure, and the earth and sand can be discharged smoothly and reliably. As described above, the guide hole excavating device for the underground buried body of the present invention is provided with a pair of cutter arms rotatably in the horizontal direction and the vertical direction in the leading conduit, and the cutter drum is rotatably provided at the tip of the cutter arm. Since the cutter drum is provided so as to be able to project to the outside from the peripheral surface of the leading conduit, it is possible to dig a leading hole that is larger than the leading conduit and has a lateral cross section,
Smooth and accurate movement of the embedded body and reduction of the moving force of the embedded body can be achieved. The device of the present invention has a drainage pipe capable of sucking excavated earth and sand inside the buried body, and one end of the pipe is arranged behind the excavation device to eliminate the conventional screw auger and simplify the configuration. The excavated soil can be carried out smoothly and reliably. The device of the present invention is provided with a lock pin capable of locking the leading conduit and the embedded body, and an elastically deformable spring piece is attached to the pin, and when the spring piece is elastically deformed, the spring piece is attached to the leading conduit. Since it is provided so as to be engageable with the provided spring receiver, the work of attaching and detaching the leading conduit and the buried body can be performed easily and quickly.

[Brief description of drawings]

FIG. 1 is a front view in which the present invention is applied to the construction of an underpass that crosses under a track.

FIG. 2 is a plan view showing an embodiment of the excavation device of the present invention.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a left side view of FIG.

FIG. 5 is a cross-sectional view showing a state of attachment of a leading conduit and an embedded body applied to the excavating device of the present invention.

FIG. 6 is a plan view showing a second embodiment of the excavation device of the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a cross-sectional view showing a third embodiment of the present invention, showing another embodiment of the excavation cross section of the guide hole.

FIG. 9 is a cross-sectional view showing a fourth embodiment of the present invention, showing another embodiment of the excavated cross section of the guide hole.

[Explanation of symbols]

 1 Earth Ground 2 Ground Structure (Rail) 4 Buried Body (Buried Pipe) 6 Lock Pin 8 Spring Receiver (Lock Pipe) 10 Spring Piece (Disc Spring) 11 Lead Conduit 23 Cutter Arm 24 Cutter Drum 25 Lead Hole 34 Evacuation Pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taro Shimohira 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Iron Construction Co., Ltd. (72) Inventor Masaharu Saito Misaki-cho, Chiyoda-ku, Tokyo 2-5-3 Iron Construction Co., Ltd. (72) Inventor Hiroshi Iwamoto 3-6-5 Hagichu, Ota-ku, Tokyo Within Taiku Co., Ltd.

Claims (6)

[Claims] 1. A columnar buried body having an excavation device attached to one end thereof is provided, and a guide hole is excavated immediately below the above-ground structure through the excavator in a direction orthogonal to the above-ground structure, and the excavated earth and sand is guided through the guide hole. In the method of laying an underground buried body in which a buried body is moved along the leading hole and laid, and a plurality of buried bodies are laid side by side, the buried body has a horizontally long cross-sectional shape, and The hole is excavated in a laterally long cross-sectional shape larger than the buried body, the long side of the leading hole is drilled parallel to the laying direction of the ground structure, and the long side of the buried body is laid in the leading hole in the laying direction of the ground structure. A method for laying an underground buried body, which is characterized in that it is arranged in parallel with. 2. The method for laying an underground buried body according to claim 1, wherein the buried body has a horizontally long rectangular cross-sectional shape, and the guide hole is excavated in a horizontally long rectangular cross-sectional shape larger than the buried body. 3. The method for laying an underground buried body according to claim 1, wherein the excavated soil is sucked and discharged. 4. A buried body to be laid in a guide hole excavated in the natural ground is provided, and a leading conduit is detachably attached to one end of the buried body.
The leading conduit is equipped with a drilling device capable of drilling a leading hole, and in a leading hole drilling device for an underground buried body provided with a discharge path for excavated earth and sand inside the buried body, a pair of cutter arms is horizontally provided in the leading conduit. And provided so as to be rotatable in the vertical direction,
A leading hole excavating device for an underground buried body, wherein a cutter drum is rotatably provided at a tip of the cutter arm, and the cutter drum is provided so as to be able to project outward from a peripheral surface of a leading conduit. 5. A lead hole excavating device for an underground buried object according to claim 5, wherein an earth discharging pipe capable of sucking excavated earth and sand is provided inside the buried object, and one end of the pipe is arranged behind the excavating device. 6. A lock pin capable of locking the front conduit and the embedded body is provided, and an elastically deformable spring piece is attached to the pin.
The guide hole excavating device for an underground buried object according to claim 5, wherein the spring piece is provided so as to be engageable with a spring receiver provided in the tip conduit when the spring piece is elastically deformed.