JPH0633685A - Tunnel pilot excavation method and pilot excavation pipe anchor device - Google Patents

Abstract

PURPOSE:To form a pipe roof of a long span on the other side of a natural ground on a cross section of a tunnel before it is excavated. CONSTITUTION:A rod 12 is driven into a natural ground 2 by way of a drilling hole bit 16 at the tip of a boring tube 13 which covers the outer periphery. A setting agent is injected into the hole while the tube 13 is being pulled up, thereby forming an anchor fixing body 110. While gripping and drawing the rod 12 by way of a shielding gripper 20 and a shielding jack 19, the surrounding area is drilled with a cutter 9, thereby placing a pipe 7 into the natural ground 2. The pipe is placed in such a fashion that it may cover the part which forms a tunnel space 3 latter, which stabilizes the excavated cross section and maintains its stability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel front receiving method and a front pipe anchoring device for striking a pipe roof in the ground to stabilize it before excavating a tunnel cross section.

[0002]

2. Description of the Related Art Conventionally, when constructing a tunnel by excavating a collapsible rock or a rock that frequently has cracks, a front sheet pile, a fore piling bolt, a Messel support work, etc. are pushed into the preceding rock. In order to stabilize its shape, that is, to reduce the looseness of the ground, or to protect the face and crown,
There is a case where a drilling method called a fore piling method or a receiving method is applied. In such an excavation method, in order to propel the receiving sheet pile, fore-piling bolt, Messel support, etc. into the ground, a reaction force is required for the support of the already excavated tunnel section behind the face and Messel support etc. In terms of shape, each of these front receiving members was sequentially pushed into the ground.

[0003]

However, in such a method, since the stroke for propelling the front receiving member is limited, the front receiving member is pushed into the front ground for a long span, and the wide range of the natural ground is reached. We cannot secure stability. In addition, there is a drawback in that the construction of such a receiving member is greatly affected by the workability and effect depending on the type of the stratum (rocky material) of the preceding ground and the presence or absence of spring water. Therefore, when such a receiving method is not very effective, the so-called boring method is used to install the pipe in advance.
In some cases, a pipe roof construction method is used to form a roof in the preceding ground within a predetermined range.However, such a pipe roof construction method requires large-scale rear equipment and a large excavator, and the work is extremely difficult. There was an inconvenience that it became complicated. Therefore, in view of the above circumstances, the present invention does not require a large-scale rear facility or a large excavator,
(EN) A tunnel receiving method and a receiving pipe anchor device capable of easily forming a long-span roof in a preceding ground.

[0004]

That is, according to the present invention, the anchor fixing member (11) is set by striking and setting the long fixing member (12) on the forward ground (2) ahead of the face (3a).
0) is constructed and formed, and the pipe body (7) is propelled in such a manner as to cover the outer periphery of the anchor fixing body (110) in the forward rock mass (2), and is propelled into the forward rock mass (2). By arranging a plurality of the pipe bodies (7) along the outer periphery of the tunnel space (3) excavated and formed in the forward ground (2), the tunnel space (3) is supported,
Composed. Further, a fixing body (12) which can be set and attached in a long shape is provided in the ground (2), and the fixing body (1) is provided.
The excavation means (13, 16) of 2) is provided so that the fixing body (12) can be propelled into the forward ground (2) ahead of the face (3a), and the outer periphery of the fixing body (12) is provided. A pipe body (7) that can be covered is provided in the forward ground (2) in a propulsive manner, and a rock excavating means (9) is provided at the tip of the pipe body (7) and the fixing body (12). ) Is the ground excavation means (9)
And a gripping means (20) capable of gripping the fixing body (12) is provided on the pipe body (7) so as to be movable along the fixing body (12). To be done.
The numbers in parentheses () indicate the corresponding elements in the drawings for convenience, and therefore the present description is not limited to the description in the drawings. The following "action"
The same applies to the column of.

[0005]

According to the present invention, each pipe body (7) has a structure in which the anchor fixing body (7) receives a supporting reaction force from the forward ground (2) through the anchor fixing body (110). Acts to propel into the ground (2) along 110). Further, the gripping means (20) passes through the rock excavating means (9) and leads the pipe body (7) to form a fixing body (12).
To act as a grip.

[0006]

1 is a side view showing an example of a front receiving pipe anchor used in a tunnel front receiving method according to the present invention, and FIG. 2 is a side view showing a state of the front receiving pipe anchor shown in FIG. 3 is a side view showing a pipe propelling jack portion of the front receiving pipe anchor shown in FIG. 1, FIG. 4 is a front view showing an example of a cutter in the front receiving pipe anchor shown in FIG. 1, and FIG. 5 is shown in FIG. 8 is a front view showing an example of a boring rod in the front receiving pipe anchor, FIG. 6 is a sectional side view showing a tunnel excavation method using the front receiving pipe anchor shown in FIG. 1, and FIG. 7 is a cross-sectional view of FIG. FIG. 10 is a series of diagrams showing a method of setting and attaching to the natural ground in the front receiving pipe anchor shown in FIG.

As shown in FIG. 6 or 7, the tunnel 1 under construction is made of hard rock or the like and has a certain amount of independence 2
It has a tunnel space 3 already excavated inside,
The tunnel space 3 is formed by excavating from the arrow B direction side in FIG. 6 toward the arrow A direction, and the cutting face 3a is arranged at the leading end of the arrow A. In the ground 2 around the tunnel space 3 and in the ground 2 ahead of the face 3a, a pipe roof 5 surrounds the space 3 or a portion of the ground 2 which becomes the tunnel space 3 in a radial direction. 1 is formed and constructed so that the space 3 is covered in a roof shape, and the pipe roof 5 has a shape in which the pipe 7 in the front receiving pipe anchor 6 shown in FIG. 1 covers the outer circumference of the pipe 7. In addition to the rod 12 which is a long fixing member propelled in the ground 2, the pipe remaining body 61 in the form of remaining fixed in the ground 2 is provided. Therefore, a plurality of pipes 7 are arranged along the outer circumference of the portion which will be the tunnel space 3 later. As shown in FIG. 6 or FIG. 7, the pipe remnants 61 are struck by a predetermined number per cross section having a predetermined pitch in the directions A and B, which are the extending directions of the tunnel 1. As shown in FIG. 7, the tunnel space 3 has a horseshoe-shaped cross section and is arranged radially inside the roof formed by the plurality of pipe remnants 61. Is being formed.

As shown in FIG. 1, the front receiving pipe anchor 6 has an outer diameter D1 which can be extended to a predetermined total length L1.
Has a pipe 7 made of steel pipe, etc.
1 is a direction in which the longitudinal direction, which is the extension direction (that is, the extension direction) shown in the left-right direction in FIG. 1, is directed substantially horizontally as shown by arrows C and D in FIG. , Is arranged in the ground 2. The pipe 7 is provided with a partition wall 71 at the center shown in the left-right direction of FIG. 1 so as to block the space inside the pipe 7 in the left-right direction of FIG. Is the sediment discharge port 72,
The pipe wall portion of the pipe 7 is formed so as to partially open. At the left end of FIG. 1 which is the tip of the pipe 7, the cutter 9 having a diameter of approximately D1 which is the excavation means of the pipe 7 is of a shape that can be rotationally driven in the directions of arrows E and F about the rotation center CT1 of FIG. It is provided in the shape of a disk, and the cutter 9 shown in FIG.
As shown in FIG. 4, chips 9a are mounted and mounted on the surface shown at the left end so that the cutting edge is directed toward the left side in FIG. 1, which is the tip side, as shown in FIG. As shown in FIG. 4, four gaps 9s are formed in the cutter 9 so as to penetrate therethrough in the direction intersecting with the plane of FIG. 4 (left and right direction in FIG. 1). Is spline 91
4 is the front-back direction of the cutter 9 like the space 9s.
It is formed by penetrating in a direction intersecting with the plane of the drawing (left-right direction in FIG. 1). In the space inside the pipe 9 between the cutter 9 and the earth and sand discharge port 72, the earth and sand 21 (not shown) formed by the cutter 9 excavating the natural ground 2 is conveyed to the earth and sand discharge port 72. The screw 15 for performing the operation is provided in the form of a hollow spiral, and the screw 15 is formed by the connecting rod 15
It is connected to and supported by the cutter 9 via 1.

An anchor body 11 is provided in the space inside the pipe 7 as shown in FIG. 1, and a spline 91 of the cutter 9 is provided.
The anchor body 11 is housed in such a manner that it can be projected and retracted through the portion, that is, movably in the left-right direction in FIG. 1 relative to the pipe 7, and the anchor body 11 is formed in a rod shape in a long shape. And a boring tube 13 which can be joined and separated from the rod 12 formed in a pipe shape so as to cover the outer periphery of the rod 12 so that the rod 12 can be set and fixed in the ground 2. . The rod 12 is composed of a high-tensile steel rod or the like that can be extended to a length corresponding to the length L1 of the pipe 7 described above, and appropriate irregularities for discharging powder and adhering fixing material are provided around the rod 12. Are continuously formed around the entire length thereof. On the other hand, as shown in FIG. 5, the boring tube 13 constitutes a spline shaft that fits with the cutter 9, that is, the boring tube 13 has a rib 131 (which engages with the spline 91 of the cutter 9). 5) is continuously formed over the entire length in the longitudinal direction shown in the left-right direction in FIG. At the left end of FIG. 1 which is the tip of the boring tube 13, a drill bit 16 for propelling the anchor body 11 formed by the tube 13 and the rod 12 into the ground 2.
Is provided so as to be rotatable in the directions of arrows E and F about a rotation center CT1 in FIG. 1 which is the same axis as the cutter 9. As shown in FIG. 2, the drill bit 16 has
A hole 16s is formed in the central portion so as to penetrate in the left-right direction in FIG. 2, which is the front-rear direction. The rod 16 and the boring tube 13 are formed in the hole 16s when the natural ground 2 is drilled by the drill bit 16. Gap 11s between and (shown in FIG. 5)
Cutting water such as muddy water is supplied via the. In addition, rod 1
As shown in FIG. 2, both 2 and 1 are attached to the boring tube 13 through the holes 16s of the boring bit 16.
3 is movable in the longitudinal direction, that is, in the front-rear direction, that is, in the left-right direction in FIG. 2, and at the same time, the rod 12 can pass through the cutter 9 through the spline 91 portion of the cutter 9. The outer circumference is covered with the pipe 7.

As shown in FIG. 1, the anchor body 11 composed of the rod 12 and the boring tube 13 has the partition wall 71 in the space inside the pipe 7 so as to be inserted into the hollow portion of the screw 15. It is arranged so as to penetrate in the left-right direction of FIG. 1 which is the front-rear direction, and at the right end of FIG. 1, which is the rear end of the anchor body 11, is arranged in a space portion behind the partition wall 71 in the pipe 7. A motor 10 capable of rotating the cutter 9 is connected via a gear box 17. The gearbox 17 includes a gear 171 that can be fitted to the shank 152 arranged at the left end of FIG. 1, which is the base end of the screw 15, and the motor 10 arranged at the left side of FIG. It is provided in a form connected to the motor 171 by the gear 171.
Also, the drill bit 16 of the boring tube 13 engaged with the spline 91 is rotatably driven.

Further, in the space on the rear side of the partition wall 71 in the pipe 7, as shown in the left end portion of FIG. 1, the propulsion jack 1 which serves as a reaction force when propelling the pipe 7 into the ground 2.
9 are fixed to the inner peripheral surface of the pipe 7 via a fixed frame 191, and are mounted and arranged in a pair in the upper and lower sides of FIG. 3. Each propulsion jack 19 has a piston rod 192 as shown in FIG. 3 is provided so that it can be driven backward and forward from the main body of the jack 19 by the amount corresponding to the jack stroke in the lateral direction of FIG. As shown in FIG. 3, each propulsion jack 19 has a propulsion gripper 2 used for propelling the pipe 7.
No. 0 is attached to the tip end portion (right end portion in FIG. 3) of the piston rod 192 via a flange 193, and the gripper member 201 of the propulsion gripper 20 can selectively grip the rod 12 of the anchor body 11. It is provided in each form. Therefore, each propulsion gripper 20 is configured to be movable along the rod 12, which is the left-right direction in FIG. 3, as the piston rod 192 of the propulsion jack 19 projects and retracts. Further, on the left side of FIG. 3 which is the front side of the fixed frame 171 on which the propulsion jack 19 is mounted and supported, the pulling jacks 22 for use when pulling the boring tube 13 are fixedly mounted in a pair in the vertical direction of FIG.
Each towing jack 22 is provided with a towing gripper 23 in such a form that it can be driven backward and backward by the amount of the jack stroke of the towing jack 22 in the left-right direction in FIG. 3, and each towing gripper 23 is provided with a gripper member 231. The outer peripheral portion of the boring tube 131 of the anchor body 11 is provided so as to be selectively grippable.

Since the tunnel 1 and the like have the above-described structure, when constructing the tunnel 1, as shown in FIG. 6, from the face 3a of the already formed tunnel space 3, In the ground 2 on the left side of FIG. 6 of the face 3a, which is the preceding ground, a predetermined number of pre-received pipe anchors 6 are driven per cross-section, and the pipe remnants 61 are attached to the ground 2.
A pipe roof 5 is formed and constructed by fixing it inside and arranging a plurality of it in the form of covering the ground 2 of the portion which will later become the tunnel space 3 in a roof shape.
The tunnel space 3 is supported through. In order to drive the front receiving pipe anchor 6 into the natural ground 2, first, as shown in FIG. 8, the entire front receiving anchor 6 including the pipe 7 is set in the bore hole 25 for driving the anchor 6. To do. Then, the rod 12 and the boring tube 13 in the propulsion gripper 20 and the towing gripper 23.
The gripped state of 1 is released, and the anchor body 11 formed by these 12 and 13 is opened to the pipe 7. In this state, when the cutter 9 is rotationally driven via the motor 10, the boring tube 13 engaged with the spline 91 thereby obtains a rotational force, so that the drill bit 16 has an arrow around the rotation center CT1. It is rotationally driven in the E and F directions. Then, the motor 10 is driven while supplying cutting water such as muddy water to the hole 16s in a form of being supplied through the gap 11s, and the anchor body 11 is in the natural ground 2 in the pipe driving direction shown in FIG. Push in in the direction of arrows C and D. Then, in the anchor body 11, as shown in FIG. 8, while the cutter 9 is arranged and fixed at the front end 25a of the bore hole 25, the drill bit 16 is directed toward the arrow C direction side in the natural ground 2 by its propulsive force. Only the side of the anchor body 11 is driven into the natural ground 2 in a form of propelling it. That is, the anchor body 11 is self-drilled by the boring bit 16 attached to the tip of the boring tube 13 in a form of receiving only the rotational force from the cutter 9 via the spline 91. The powdered powder formed from the piles 2 is prevented from being pushed around the tube 13 or is on the rear side due to the circulation operation of the muddy water supplied to the hole 16s through the gap 11s formed between the rod 12 and the anchor tube 13. It is discharged and removed by being sent to the right side in FIG. by the way,
The rod 12 and the boring tube 13 forming the anchor body 11 can be made to have an arbitrary length simply by extending and extending the rod 12 and the boring tube 13 from the base end side (right side in FIG. 1) of the anchor body 11. 11 until a predetermined length corresponding to the total length L1 of the pipe 7 to be cast later (for example, in the embodiment until the length becomes 40 m to 50 m), while appropriately adding the rod 12 and the tube 13, Drive into 2.

When the operation of driving the anchor body 11 is completed in this way, as shown in FIG. 9, next, for example, low-strength cement milk, foaming resin or the like having a shape capable of fixing the rod 12 to the ground 2. The hardening agent 26 is supplied to the drill bit 16 through the gap 11s and discharged from the hole 16s, and the hardening tube 26 fixes the rod 12 to the natural ground 2 and only the boring tube 13 at the rear side. Pull out to the left in Fig. 9 and remove. The hardening agent 26 has a shape corresponding to the nature of the ground 2, and rather than its strength, the rod 12 is formed in consideration of the permeability into the bedrock forming the ground 2 or the water stopping property. It was designed and adopted as appropriate so that it can be firmly established in the natural ground 2. In order to pull out and remove the boring tube 13 from the natural ground 2, the pulling gripper 23 is driven by using the pulling jack 22 described in detail in FIG. 3 and the outer peripheral portion of the tube 13 is gripped by the gripper material 231. And the gripper 23 as shown in FIG.
By repeating the operation of projecting and retracting in the left-right direction, the spline 91 portion of the cutter 9 is sequentially fed. If the base end side (arrow D direction side) of the boring tube 13 is pulled back into the tunnel space 3 from the bore hole 25, while appropriately pulling it toward the rear side of the tunnel space 3, the additional portion is disassembled. Then, prepare for the next anchor body 11 excavation work.

Thus, as shown in FIG. 2, the boring tube 1 reaches the position where the drill bit 16 returns to the inside of the cutter 9.
When 3 is pulled back and a predetermined amount of hardening agent 26 is injected, a predetermined length L2 is fixed in the natural ground 2 from the left end side of the rod 12 in FIG. An anchor fixing member 110 having a fixing length L2 is fixedly disposed on the fixing member 110. Then, next, the pipe 7 is propelled and fixed in the ground 2 in a form of obtaining the supporting reaction force of the anchor fixing member 110. Therefore, first, with the pulling gripper 23 released from the boring tube 13 and the piston rod 192 of the propulsion jack 19 contracted again, the propulsion gripper 20 is driven and the gripper member 201 grips the rod 12. . Then, the pipe 7 is connected to and supported by the anchor fixing body 110 via the fixed frame 191. In this way, when the cutter 9 is rotationally driven in the directions of arrows E and F around the rotation center CT1 shown in FIG. 1 via the motor 10, the cutter 9 is rotated and is already fixed and supported by the natural ground 2. When the pipe 7 obtains a supporting reaction force from the natural ground 2 via the anchor fixing body 110, the tip 9a cuts the rock or the like forming the natural ground 2 to form the front receiving pipe anchor 6. As shown in FIG. 10, all of the existing members except the rod 12 already fixed to the natural ground 2 are propelled in the direction of arrow C in the natural ground 2.
With the propulsion operation of the front receiving pipe anchor 6, the pipe 7 extends along the rod 12 in such a manner as to cover the outer periphery of the rod 12 whose tip side is already fixed and supported by the natural ground 2 to become the anchor fixing body 110. And is pushed into the ground 2 on the front side of the face 3a. It should be noted that the earth and sand (not shown) formed by the cutter 9 excavating the natural ground 2 is the arrow on the rear side due to the rotation of the screw 15 which rotates via the connecting rod 151 by the rotation operation of the cutter 9. It is discharged from the earth and sand discharge port 72 of the pipe 7 while being sent to the D direction side.

By the way, when the front receiving pipe anchor 6 is propelled together with the pipe 7 in the direction of the arrow C into the natural ground 2, the propelling jack 19 has its piston rod 192, as shown in FIG. The propulsion jack 1 is projected toward the rearward direction of the arrow D and eventually
When the stroke of 9 is full, the front receiving pipe anchor 6 cannot obtain the supporting reaction force of the anchor fixing member 110. Then, when the stroke of the propulsion jack 19 is full, the gripper material 2 of the propulsion gripper 20 is temporarily provided.
01 is released, and then the piston rod 192 of the propulsion jack 19 is contracted to cause the propulsion gripper 20 to move.
Is pulled toward the arrow C direction side which is the forward side. That is, the propulsion gripper 20 moves along the anchor fixing member 110 formed by the rod 12 by the projecting / retracting motion of the piston rod 192 of the propulsion jack 19, while the tip side of the propelling gripper 20 passes through the cutter 9. Since it is possible to grip the base end side of the rod 12 that is arranged in a leading shape, the gripping position can be advanced by the stroke of the propulsion jack 19. Therefore, as described above, again, by connecting and supporting the front receiving pipe anchor 6 including the pipe 7 to the anchor fixing body 110 in a form in which the rod 12 is gripped by the gripper material 201, the front receiving is performed by rotationally driving the cutter 9. The operation of propelling the pipe anchor 6 is repeated until a single full length of pipe 7 is pushed into the ground 2. When a single full length of the pipe 7 is pushed into the natural ground 2, when the pipe 7 is extended next time, the extension pipe 7 is inserted into the partition wall 71 and the earth and sand discharge port 72. Do this in.

By repeating the above-described propulsion operation of the front receiving pipe anchor 6 while repeating the predetermined number of pipes 7 until the pipe 7 reaches the predetermined length L1, the pipe 7 is already in the natural ground 2. The anchor fixing body 110 formed of the rod 12 fixed to the fixing anchor 110 is pulled and pulled from the fixing body 110 by the propelling gripper 20 and pulled out from the rock anchor 2 of the pipe anchor 6. The long-span member excluding the removed boring tube 13 is always propelled in the natural ground 2 with good directionality so as to cover the outer periphery of the anchor fixing body 110. Therefore, in order to propel the pipe 7 in the ground 2,
If the front receiving pipe anchor 6 is used, no large boring machine or large-scale rear equipment is required. In the receiving pipe anchor 6,
After the pipe 7 is once arranged in the ground 2 leading to a predetermined depth, the boring tube 13 is fitted again so as to cover the circumference of the rod 12, and the pipe 7 is further advanced via the boring bit 16. It is also possible to drive the rod 12 toward the leading side of the natural ground 2. Therefore, if the driving direction of the front receiving pipe anchor 6 is made substantially parallel to the tunnel extension direction, a considerably long distance can be achieved. Therefore, a pipe roof 5 for supporting the tunnel space 3 can be formed and constructed.

When the pipe 7 is propelled in the ground 2, the portion of the pipe 7 that is closer to the base end (right side in FIG. 1) than the partition 71 and the motor 10 housed in the pipe 7 are located. When the gear box 17, the propulsion jack 19, the propulsion gripper 20, the towing jack 22, the towing gripper 23, the cutter 9, the screw 15 and the like are appropriately removed and removed, the pipe remaining body 61 is left in the natural ground 2. It
Therefore, as described above, the pipe residual body 61 is placed in the ground 2 by using the front receiving pipe anchor 6, and the face 3 of the ground 2 is cut.
When a plurality of tunnel spaces 3 to be formed on the front side of a are covered in a roof shape as shown in FIG. 6 or FIG.
By the plurality of pipe remnants 61 having a long span, that is, the pipe roof 5, it is ensured that the rock or the like constituting the natural ground 2 is not loosened over a very long distance. Further, in the natural ground 2, the pipe roof 5 formed by a plurality of pipe remnants 61 each formed of the pipe 7 is formed along the outer periphery of the portion to be the tunnel space 3 later. In addition to arranging the ground 2 corresponding to No. 3 in the form of a roof-like covering, the hardening agent 26 injected and filled around the rod 12 to fix it to the ground 2 is already ground. Since it penetrates into the mountain 2 and is hardened, the waterproofness of the natural ground 2 is secured and the ground improvement effect is also expressed, and the natural ground 2 on the side ahead of the existing face 3a is sufficiently It will be reinforced. So next, face 3
In the main excavation work of the tunnel space 3 performed by advancing a in the direction of the arrow A in FIG. 6, the pipe roof 5 below the tunnel space 3 is dug in a belly shape over a long distance. Therefore, excavation work can be performed safely and efficiently with a stable cross section.

In the tunnel 1, the pipe roof 5 is constructed and arranged in the natural ground 2 prior to excavation of the tunnel space 3, so that the exploration of the ground in the forward direction is performed during the work of constructing the pipe roof 5. You can do the work. In addition to the pipe roof 5 that can be formed with a long span at a time as described above, the pipe roof 5 has a free cross-sectional shape (for example, flat, oval, rectangular, horseshoe-shaped, spectacle-shaped, etc.) and a large cross-section. Therefore, a wide space can be formed in the tunnel space 3 in front of the face of the face 3a (the direction of the arrow B in FIG. 6), and a large excavator can be used for the excavation work to achieve an efficient cross-sectional shape. The excavation work can be performed efficiently and with high safety. Further, each pipe 7 is supported by an anchor fixing body 110 constituted by a rod 12 which is fixedly supported by the natural ground 2 and firmly fixed to the natural ground 2, and in addition to the tunnel space 3 later. The ground 2 of
Since the structure is reinforced by the pipe roof 5 which constitutes the aggregate of the pipes 7, the internal stress possessed by the natural ground 2 itself is not always relaxed, and the maximum utilization is achieved, that is, Since the constituent members including the ground 2 forming the tunnel 1 support each other, it is possible to secure a high stable cross-section in the tunnel space 3 with a minimum amount of support work.

[0019]

As described above, according to the present invention, the anchor fixing member is formed by setting and fixing the fixing member such as the long rod 12 on the leading ground such as the ground 2 ahead of the face 3a. 110 is constructed and formed, and a pipe body such as the pipe 7 is propelled in the forward ground to cover the outer periphery of the anchor fixing body 110, and the pipe body propelled into the forward ground is converted into the forward rock. Since a plurality of the pipe bodies are arranged along the outer circumference of the tunnel space 3 to be excavated and formed so as to support the tunnel space 3, each pipe body is
The anchor fixing member 110 can be propelled into the natural ground along the anchor fixing member 110 in the form of obtaining a supporting reaction force from the forward rock. Therefore, since the pipe body is easily placed in the ground by obtaining the propulsive force from the ground ahead via the anchor fixing body 110, the supporting force of the ground itself is effectively provided in the preceding ground. A long-span roof can be easily formed by using the method. Then, prior to excavation of the tunnel cross section, it is possible to continuously form a long-span pipe roof on the ground by simply setting and mounting the fixing body on the ground at the forward side. The mountain is well reinforced without any loosening. Further, in addition to the pipe roof thus formed having an arbitrary shape, it is possible to search the soil quality of the natural ground by the pipe roof preceding the face, and therefore, the forward ground is excavated later. The tunnel space 3 thus formed is always stable over a long span regardless of the excavation cross-sectional shape and the excavation means used for the excavation cross-section. Therefore, the cross-section of the tunnel space 3 is ensured. The excavation work can be carried out extremely safely and efficiently. Further, in order to set and fix the fixing body on the ground, the fixing agent such as the hardening agent 26, which has a waterproof property or has a ground improvement effect due to its permeability, can be further used. An effective ground improvement effect can be expressed. Further, it has a fixing body such as a rod 12 which can be set and attached in a long shape in the ground, and the fixing body is a cutting face of the fixing body such as a boring tube 13, a boring bit 16 or the like. 3a is provided in such a manner that it can be propelled into the forward ground such as the natural ground 2 and the like, and a pipe body such as a pipe 7 that can cover the outer periphery of the fixing body is provided in the forward ground, in a freely propellable form, A rock excavating means such as a cutter 9 is provided at the tip of the pipe body so that the fixing body can pass through the rock excavating means, and a propulsion gripper 20 or the like capable of gripping the fixing body on the pipe body. Since the gripping means is provided so as to be movable along the fixing body to configure the pre-receiving pipe anchor device such as the pre-receiving pipe anchor 6, the gripping means passes through the rock excavating means and leads the pipe body. It is possible to grip a fixing body having a shape. That is, the fixing body is such that it freely passes through the rock excavating means, and the excavating means of the fixing body itself leads the pipe body by an arbitrary length, prior to the setting of the pipe body. It can be promoted in advance to the ground. Therefore, when the pipe body is driven into the ground rock, the gripping means is used to fix the pipe body by the fixing member which is fixed and supported in the ground rock in the form of leading the pipe body in advance by an arbitrary length. By gripping and pulling, there is no need for a large excavator such as a boring machine or complicated rear equipment, and it is extremely efficient and propelled and fixed along the fixing body with good directionality, and the pipe body is in the ground. Easily promoted to. Then, prior to excavation of the tunnel cross section, it is possible to easily form a pipe roof of any length in the forward ground and reinforce the natural ground of the portion to be excavated later, and to secure its stability more reliably. I can. The driving source such as the motor 10 for driving the fixing body excavating means and the rock excavating means, and the casing portion covering the fixing body such as the boring tube 13 are pulled out from the natural ground to remove other parts. It is economical because it can be diverted to install a pipe body.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a receiving pipe anchor used in a tunnel receiving method according to the present invention.

FIG. 2 is a side view showing a state of the front receiving pipe anchor shown in FIG.

FIG. 3 is a side view showing a pipe propulsion jack portion of the front receiving pipe anchor shown in FIG.

FIG. 4 is a front view showing an example of a cutter in the front receiving pipe anchor shown in FIG.

5 is a front view showing an example of a boring rod in the receiving pipe anchor shown in FIG. 1. FIG.

6 is a cross-sectional side view showing a tunnel excavation method using the receiving pipe anchor shown in FIG. 1. FIG.

7 is a cross-sectional view of FIG.

FIG. 8 is a diagram showing a method of setting and landing on a natural ground in the front receiving pipe anchor shown in FIG.

FIG. 9 is a view showing a method of setting and landing on a natural ground in the front receiving pipe anchor shown in FIG.

FIG. 10 is a view showing a method of setting and landing on a natural ground in the front receiving pipe anchor shown in FIG.

[Explanation of symbols]

2 ... Destination rock (ground) 3 ... Tunnel space 3a ... Face 6 ... Receiver pipe anchor device (receiver pipe anchor) 7 ... Pipe body (pipe) 9 ... Ground excavation means (cutter) ) 110: anchor fixing body 12: fixing body (rod) 13: fixing body excavating means (boring tube) 16: fixing body excavating means (drilling bit) 20: gripping means (propulsion gripper)

Claims (2)

[Claims] 1. An anchor fixing body is constructed and formed by striking and setting a long fixing body on a forward ground ahead of a face, and the anchor fixing body is covered in the inside of the forward rock. A structure for supporting the tunnel space by propelling the pipe body and arranging a plurality of pipe bodies propelled in the forward rock mass along the outer circumference of the tunnel space formed by excavation in the forward rock mass. The tunnel receiving method. 2. A fixing body which can be set and attached in a long shape in the natural ground, and in which the excavation means of the fixing body can propel the fixing body into the forward ground ahead of the face. A pipe body capable of covering the outer periphery of the fixing body is provided in the forward ground in a freely propellable manner, a rock excavating means is provided at the tip of the pipe body, and the fixing body is the rock excavating means. And a gripping means capable of gripping the fixing body on the pipe body so as to be movable along the fixing body.