JPH11210380A - Rock tunneling machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve a stable excavation ground by using a boring machine mounted on a tunnel excavator and bringing a chemical solution injection part close to a scheduled face, and with a minimum amount of chemical solution injection operations without difficulty. To SOLUTION: A boring machine 10 having a chemical solution injection function is mounted and installed at a rear position of a main beam 3 extending rearward from the inside of a main body 2 of the tunnel boring machine 1, and a drill 12 of the boring machine 10 is mounted on the tunnel boring machine. 1
An axis is set at an angle from the inside of the main body 2 to the outside of the outer peripheral portion of the cutter head 6. A drill guide 7 a through which the drill 12 of the boring machine 10 can pass is provided in the roof support 5 at the front of the main body 2. Insertion hole 7 provided
Are provided at a plurality of locations in a required distribution within a range covering the upper half of the main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rock tunneling machine, and more particularly, to excavating a stratum in which excavated ground contains a weak layer having a low degree of independence in a solid rock portion. In this case, the present invention relates to a rock tunneling machine which is provided with a boring means capable of solidifying the ground immediately above a face by injection of a chemical solution so that the ground can be improved and excavated.

[0002]

2. Description of the Related Art Conventionally, an open-type TBM (tunnel excavator) has been used to excavate a hard rock layer, but the excavated ground layer is free standing on a part of the hard rock layer. In the case where a collapsible stratum having a low degree of coexistence is present, measures must be taken to prevent the collapse of the ground at the face to excavate the collapsible stratum.

[0003] In order to excavate a stratum in which such a low independence collapsible stratum is mixed, there is not much problem if a shield tunneling machine is originally used, but a part of the hard rock layer has a low independence collapse. When it cannot be inferred that mixed strata are mixed, excavation is often performed using an open-type TBM as described above. In such a case, if normal excavation is continued, the collapse of the ground at the face will occur, making the work difficult. Therefore, when a collapsed stratum is encountered, a method of injecting a chemical solution into a place where there is a possibility of collapse and solidifying the solution after excavation is considered as a countermeasure.

[0004] As for the means for injecting a chemical solution into the ground and solidifying it, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-185894, at the junction of the tunnel in a shield tunnel excavation work, the inside of the shield machine is transferred to the ground. On the other hand, the rod is inserted into the ground by the injection of high-pressure water and the injection of compressed air with the triple pipe rod of the compressed air injection pipe, high-pressure water pipe, and chemical liquid injection pipe, and the ground hardening material is injected into the ground from the nozzle at the rod tip. For improving the ground by injecting into the ground. Also, Japanese Patent Application Laid-Open No. Hei 3-161695 discloses
As described above, in order to safely perform excavation by soil improvement at the junction of the tunnel excavated from both sides in tunnel excavation work using a shield tunnel excavator, a number of boring rods are used from inside the shield excavator to the ground. The chemical injection operation of this book is performed radially over the entire periphery of the excavation part, and a joining method that creates a stable zone of the ground so that the joining of the excavation part can be safely performed and a shield machine equipped with the function are disclosed. I have.

[0005] In view of such prior art, when excavating a stratum where it is presumed that a collapsible stratum with a low independence is mixed using an open type TBM as described above, and encountering a collapsible stratum, As a means for injecting and solidifying a chemical solution at a place where there is a possibility of collapse, and excavating, FIG.
(A) A method as exemplified in (b) has been attempted. In this method, a boring machine 110 is mounted on a gripper device 104 at the rear of the body of an open type TBM 101, and a drill (boring rod) 112 is interposed between a roof support 105 and a side support shoe so as not to interfere with the cutter head 106. Drill a boring rod by entering the boring rod from above.
A plurality of operations for injecting the ground hardening material into the upper portion of the cutting face of the ground A by the injection nozzle provided at the tip from the pre-installed boring rod are performed radially, and the ground A is improved and excavated. You do it. The boring machine 110 is moved within a required rotation angle range with respect to the axis of the tunnel machine 101 as shown in FIG.
As shown in (b), a hole is drilled in a fan shape to inject a chemical solution, so that a chemical solution penetrating portion D can be formed.

[0006]

However, a boring machine 110 having a function of injecting a chemical solution is provided inside the body of the open type TBM, and the ground A above the cutting face is provided.
As can be understood from the above-mentioned illustration, the attempt to inject the ground hardening material into the soil to strengthen and improve the collapsible stratum is to prevent the boring rod (drill) 112 from interfering with the roof support 105 and the side support shoe. The boring machine 110 must be mounted considerably behind the main body 102 of the excavator 101, and the chemical solution is injected into the ground A which is far away from the excavation site, so that the injection and diffusion range of the chemical solution does not reach the face position. Becomes Also, even if the ground can be strengthened, the number of drilling holes for injecting the chemical solution must be increased and the upper strengthening range of the excavated part must be excessively increased, which not only reduces the workability but also increases the amount of chemical injection. There is a problem that a lot of construction cost is required.

Further, in the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-185894 or Japanese Patent Application Laid-Open No. 3-161695, the range of injecting a chemical solution is wider than that of the above-mentioned prior art. Although effective as a ground strengthening measure in a limited zone such as a tunnel junction as intended, it cannot be adopted as a ground improvement measure for a face during excavation.

The present invention has been made in order to solve such a problem, and a chemical solution injection part using a boring machine mounted on a tunnel excavator is brought close to a face to be faced without any difficulty. An object of the present invention is to provide a rock drilling tunnel excavator capable of stably improving an excavated ground by a chemical liquid injection operation.

[0009]

In order to achieve the above-described object, a rock tunneling machine according to the present invention is provided at a rear position of a main beam extending rearward from the inside of a main body of the tunnel machine. A boring machine having a chemical liquid injection function is mounted and installed, and an axis of the drill of the boring machine is set at an angle from the inside of the main body of the tunnel machine to a slightly outside from the outer peripheral portion of the cutter head, and a support of the front part of the main body is provided. The portion is provided with a plurality of insertion holes provided with guides through which the drill of the boring machine can penetrate, in a required distribution within a range covering the upper half of the body.

According to the rock tunneling excavator of the present invention configured as described above, when the excavating face encounters a collapsible stratum, the drill axis of the boring machine is driven in accordance with a preset boring position. If you advance the drill,
The drill is guided by a guide provided on a support portion at the front portion of the main body, and is pushed into the ground through the insertion hole, so that the drill can be dug just above the face. At this time, the drill for excavating the ground can penetrate the ground through an insertion hole provided in the support portion at the front part of the main body, and can drill the hole. Therefore, a position close to the outer peripheral portion of the cutter head (a portion closer to the excavation diameter). ) Can be drilled, and after the hole is drilled to the required depth, a chemical solution is injected and the ground can be strengthened immediately above the face. Therefore, it is possible to reduce the number of ground excavations in the injection of the chemical solution for reinforcement, and the effect of improving the ground by the injection of the chemical solution is also effective, thereby significantly improving the working efficiency.

In the present invention, the turning device of the boring machine is provided so as to turn in a circumferential direction with its turning axis substantially coinciding with the axis of the tunnel machine, and a guide provided on the support portion. Is preferably provided concentrically with a required distribution. In this case, the chemical liquid injection hole of the boring machine can be rapidly and efficiently reinforced by injecting the chemical liquid only in an area covering the excavation area with respect to the ground above the face. To play.

Further, the guide portion of the drill of the boring machine is preferably provided on a support portion which can be extended and contracted in a radial direction. By doing so, there is an effect that the driving angle of the drill is changed in accordance with the situation of the ground to be excavated, so that the chemical liquid injection range can be set to the optimum range.

In addition, the boring machine can be installed through a carrier rear support member of a gripper device of a tunnel excavator, so that a chemical solution injection operation for strengthening the ground while excavating is performed. Can be performed in parallel. In addition, a chemical diffusion nozzle is installed at the tip of the drill of the boring machine when injecting the chemical, and a mechanism that can be operated by the liquid supply unit so that the instantaneous and slow-setting chemicals can be switched arbitrarily. If it is possible to cope with the situation of the ground by adding, it is also possible to expand the improvement range by selecting the ground hardening agent and to reduce the number of injections of the chemical solution.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rock tunneling machine according to an embodiment of the present invention.

FIG. 1 is a longitudinal sectional view schematically showing a rock tunneling machine according to the present invention, and FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view in which the sight and the IV-IV sight are shown in half each.
FIG. 1 is an enlarged sectional view taken along the line III-III of FIG. 1, and FIG.
VV-view enlarged cross-sectional views are shown respectively.

As shown in these figures, a rock tunneling machine 1 according to this embodiment has a main body 2 similar to a known open tunnel machine, and has a gripper device supported by a main beam 3. The boring machine 10 is mounted and supported at the rear of the installation position of 4 through a turning device 14 that turns in the circumferential direction with its axis substantially coinciding with the axis of the excavator. A drill (rod) 12 having a well-known structure mounted on a beam 11 of the boring machine 10 has an axis extending from the outer periphery of the cutter head 6 from the inside of the roof support 5 covering the upper half of the main body 2 of the tunnel machine 1. It is installed at a slightly outward angle. The drill (rod) 12 can be sequentially connected to a required length by a well-known joint (not shown). The drill (rod) 12 has a double pipe structure in which a chemical liquid condensed by two-liquid mixing can be separately supplied. I have. A chemical injection nozzle (not shown) is attached to the tip of the drill 12, and a liquid supply pipe from a chemical supply device, which is not shown in the figure, is connected to the rear end of the drill drive 12 a. Is done.

The roof support 5 in the main body 2 of the tunnel machine has a drill guide 7a through which the drill 12 can penetrate from the inner peripheral part to the outer peripheral part and protrude toward the ground.
Are provided at a plurality of places (five places in the specific example, but not limited to the number and the arrangement range) at a predetermined angle and at an appropriate interval within a range of about 120 ° in the upper half part. Have been. The insertion hole 7 is formed so as to gradually open from the inside to the outside of the roof support 5 at a predetermined angle, and the inside of the roof support 5 is covered with a gutter-shaped cover 7b.

The drill guide 7a is provided in the insertion hole 7
At the inner end of the shaft, a drill having a structure capable of slidingly supporting the rod of the drill 12 in the axial direction and rotatably supporting the rod is attached. The roof support 5 having the drill guide 7a (the insertion hole 7) is made expandable and contractible in the radial direction by support links 8, 8 connected to the main body frame 9 and a hydraulic cylinder 8a for expansion.

Tunnel machine 1 constructed as described above
Means that while the excavation operation continues and the vehicle is advanced, if the existence of a low-independence collapsible stratum is detected (for example, exploration by advanced boring), the excavation by the cutter head 6 is temporarily stopped (or stopped). No) operating the boring machine 10 and moving the drill drive 12 along the beam 11
a, advance the drill 12 to the roof support 5
Through the drill hole 7 through the drill hole 7 through the drill guide 7a. In this state, as illustrated in FIG. 5A, the drill 12 protruding from the insertion hole 7 toward the ground A is slightly away from the outer peripheral portion of the cutter head 6 in the radial direction. Drilling C is performed on the ground A side, and the vehicle moves forward. When the rod is connected by a known means in accordance with the drilling advance of the drill 12 and the required length (required depth) is drilled C, the chemical is supplied from the chemical supply device through a liquid supply pipe previously connected to the rear end of the rod. Into the rod,
The mixed chemical solution is injected from the injection nozzle at the tip of the drill toward the periphery of the drilled hole C, and is permeated and diffused into the ground A,
The ground is hardened and strengthened by the chemical liquid permeation part D. At this time, with respect to the chemical solution to be injected, two liquids having a composition whose curing speed is set in advance in accordance with the expected softness of the ground A are supplied and mixed and injected.

When the injection of the chemical solution at one location is completed in this way, the drill 12 is retracted and pulled out of the ground A, and the boring machine 10 is turned by the turning device 14 to the position of another adjacent drill guide 7a. The drill 12 is aligned, and the boring machine 10 is driven again in the manner described above so that the drill 12 rushes into the ground A, and a hole C is formed at a required depth to inject a chemical solution. Thereafter, this operation is repeated according to the number of drill guides 7a provided on the roof support 5 part. In this case, as exemplified in FIGS. 5A and 5B, the strengthening layer is formed concentrically with the tunnel excavator 1 that excavates into the ground portion corresponding to the upper part of the face B of the tunnel excavator 1 by chemical liquid injection. Will be formed, and will be prevented from collapsing with excavation by the cutter head 6,
You will be able to dig as it is.

At this time, if the effect of preventing the collapse is not obtained by performing only one layer hardening treatment as described above, the tunnel excavator 1 is advanced slightly and then the chemical solution is injected again in the above-described manner. By performing the operation and performing the ground hardening treatment in two stages, the ground can be more stably strengthened. By operating the tunnel machine 1 in this way,
Excavation can be performed as it is, even if a collapsing stratum with low independence is encountered, making it possible to continue excavation work without difficulty.

As described above, according to the present embodiment, the formation of the reinforcing layer by the injection of the chemical solution by the boring machine 10 is such that the center of rotation of the boring machine 10 substantially matches the axis of the excavator. As it can be stabilized by simply strengthening the minimum necessary zone when excavating,
Excessive chemical injection and the associated boring work on the ground can be performed efficiently, reducing the cost of chemical injection and improving the excavation speed together with the shortening of the time required for the work, This has the effect of promoting tunnel construction and reducing construction costs.

In the above description, the boring machine 10
Is located at the rear end of the main beam 3 at a position away from the gripper device 4 via the turning device 14, but regarding the arrangement of the boring machine 10, the It may be mounted on the carrier 4 'via a bracket (not shown). This makes it easy to operate the boring machine 10 for injecting the chemical solution while excavating. That is, the gripper device 4
Moves together with the carrier 4 'when the main body 2 moves.
Can improve the workability.

In accordance with the gist of the present invention, not only the above-mentioned open tunnel excavator but also the shield skin plate portion of the shield type tunnel excavator is provided with an insertion hole provided with the aforementioned drill guide. It can be provided. In this way, even in the case of a shield type excavator, it is effective to stabilize the ground when excavating a collapsible stratum and to improve workability.

The drill guide 7a of this embodiment corresponds to the guide of the present invention, and the roof support corresponds to the support portion at the front of the main body.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an outline of a rock tunneling machine according to the present invention.

FIG. 2 is an enlarged cross-sectional view in which each of the views II-II and IV-IV in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line VV of FIG. 1;

FIGS. 5A and 5B are diagrams showing an operation mode of the present embodiment, in which FIG. 5A is a longitudinal sectional view, and FIG. 5B is a transverse sectional view of a digging portion representing a chemical solution injection portion.

FIGS. 6A and 6B are schematic views of ground improvement of a digging portion in the prior art, in which FIG. 6A is a longitudinal sectional view, and FIG. 6B is a cross-sectional view of the digging portion showing a chemical solution injection portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel excavator 2 Body of excavator 3 Main beam 4 Gripper device 4 'Carrier 5 Roof support 6 Cutter head 7 Insertion hole 7a Drill guide 10 Boring machine 11 Beam of boring machine 12 Drill (rod) 14 Turning device A Chiyama B Face C Drilling D Infiltration part of ground

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kenzo Mizuhara 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka Prefecture Inside Okumura-gumi Co., Ltd. (72) Takayoshi Nakayama 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka No. 2 Okumura Gumi Co., Ltd. (72) Inventor: Misao Kajiwara 3-1-1 Ueno, Hirakata City, Osaka Komatsu Ltd., Osaka Plant

Claims (3)

[Claims] 1. A boring machine having a chemical liquid injection function is mounted and installed at a rear position of a main beam extending rearward from the inside of a main body of a tunnel excavator, and a drill of the boring machine is provided with a cutter from the inside of the main body of the tunnel excavator. The axis is set at an angle slightly outward from the outer peripheral portion of the head, and the support portion at the front of the main body has an insertion hole provided with a guide through which the drill of the boring machine can pass, as long as the upper half of the main body is covered. A rock drilling tunnel excavator, which is provided at a plurality of locations according to required distribution. 2. The turning device of the boring machine is provided so as to turn in a circumferential direction with its turning axis substantially coinciding with the axis of the tunnel excavator, and includes a guide provided on the support portion. The rock tunneling machine according to claim 1, wherein the insertion holes are provided concentrically at a required distribution. 3. The rock tunneling machine according to claim 1, wherein a guide portion of the drill of the boring machine is provided on a support portion which is expandable and contractible in a radial direction.