JPH07986B2 - Reaction force support structure in inclined shaft excavator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure for supporting a propulsion reaction force in an inclined shaft excavator for excavating an inclined shaft in a rock layer.

[Conventional technology]

Conventionally, a tunnel boring machine has been widely known as an excavator for excavating a tunnel in rock.

This tunnel boring machine consists of a front body with a rotary cutter plate at the front end and a rear body that follows the front body.The front body and the rear body are connected by thrust jacks and the front and rear bodies are connected to each other. A gripper that expands and contracts in the radial direction is provided on the front body, and by expanding the diameter of the gripper on the rear body side and pressing the outer peripheral surface of the gripper against the wall surface of the excavation, the front body body is subjected to a reaction force on the wall surface of the excavation through the gripper. Excavating while promoting
After excavating a certain length, the diameter of the gripper is reduced, while the gripper on the front case side is expanded and pressed against the excavation wall surface.In this state, the thrust jack is operated to move the rear case forward, and this work is repeated. You go and excavate the tunnel.

[Problems to be Solved by the Invention]

However, when the tunnel boring machine is used to excavate an upward slope with steep slopes, the machine tends to retract due to its own weight, and some grippers cannot prevent the retraction.

In particular, when the bedrock is a soft rock layer, even if the gripper is expanded and pressed against the excavated wall surface, a strong crimping force cannot be obtained,
It is extremely dangerous because the machine will retreat.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a reaction force support structure for an inclined shaft excavator that can smoothly excavate an inclined shaft while surely preventing the excavator from retracting. .

[Means for Solving the Problems]

In order to achieve the above object, the reaction force support structure in the inclined shaft excavator of the present invention is provided with a rock bolt on the inner peripheral surface of a certain length portion of a shaft wall excavated by the excavator, behind the oblique shaft excavator. A segment fastened to the wall is assembled, and a plurality of spacer members corresponding to a plurality of propulsion jacks arranged on the excavator along the inner surface of the pit wall between the segment and the excavator. It is characterized by interposing.

In such a reaction force support structure, the spacer member is composed of a main member that is elongated in the pit direction and a joint material that connects between main members that are adjacent in the circumferential direction, and the main members that are adjacent to this spacer member It is desirable to dispose a rotation stopping member fixed to the pit wall inside the facing surface and bring the rotation stopping member into contact with the inner surface of the main member to prevent rotation.

[Action]

The inclined shaft excavator excavates while supporting a reaction force on a segment fixed to a desired length portion of a shaft wall behind the inclined shaft excavator via a spacer member.

Since the segment is firmly fixed to the mine wall by the lock bolt, it is possible to reliably support a large reaction force from the excavator.

Further, since the spacer member is arranged corresponding to the plurality of propulsion jacks arranged on the excavator, the reaction force during excavation is directly received by the segment via the spacer member, and smooth propulsion is achieved. Is possible.

Further, the spacer member is composed of a main member that is long in the pit direction and a joint material that connects between main members that are adjacent in the circumferential direction, so that buckling and deformation due to axial load are prevented. By disposing a rotation stopping member fixed to the pit wall and allowing the rotation member to come into contact with the inner surface of the main member, the spacer member can be prevented from rotating, and in addition, the rotation stopping member and the spacer Since the edge of the spacer member is cut off from the member, the spacer member has a degree of freedom in the axial direction, elastic deformation due to the propulsive force during excavation is allowed, and the spacer member is not likely to be damaged.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. (1) is an inclined shaft excavator, in which a cylindrical front body (1a), a middle body (1b) and a rear body (1c) are connected in series to form a front body ( 1a) has a rotary drive mechanism for the cutter plate (2) rotatably arranged at its front end, and the rear end of the middle body (1b) is moved forward and backward on the inner peripheral surface of the front end of the rear body (1c). It is movably inserted, and the front body (1
The thrust jack (3) is connected between a) and the rear body (1c), and the front body (1) is activated by the operation of the thrust jack (3).
a) The rear body (1c) is configured to be movable back and forth with respect to the front body (1a) through the middle body (1b) that flexibly connects the front end portion to the inner peripheral surface of the rear end. is there.

Further, grippers (4) (5) protruding and retracting from the inner side to the outer peripheral surface side by a hydraulic cylinder are arranged on the peripheral walls of the front body portion (1a) and the rear body portion (1c) at appropriate intervals in the circumferential direction. It is set up.

(6) is a segment fixed to the wall of the desired length portion of the inclined shaft (a) excavated by the inclined shaft excavator (1) at the rear of the inclined shaft excavator (1). Assemble in the circumferential direction in close contact with each other, and fix it to the inner surface of the mine wall by filling mortar and the like between the pit wall and the segment from the injection hole (21) formed in the appropriate portion of the divided segment. In addition, each divided segment has a long lock bolt (7).
Has a driving hole (not shown), and the segment (6) is firmly fixed to the mine wall by radially driving into the bedrock from the inside of the mine toward the mine wall through the driving hole. It is what

Further, the segment (6) is not assembled over the entire peripheral surface of the mine wall, and as shown in FIG. 2, a space (16) is formed in a part of the lower peripheral portion of which the divided segment is not provided. Then, the chute (17) for discharging rocks for excavation is arranged in the lengthwise direction in the space (16), and the free ends of the segments (6) are integrally connected by the reinforcing beam member (18). is there.

(8) is a plurality of spacer members arranged along the inner peripheral surface of the mine wall in the mine between the rear end of the inclined shaft excavator (1) and the front end of the segment (6). As shown in FIG. 3, a hollow rectangular steel main material (8a) having an appropriate width and length and a steel joint material (8b) curved in an arc shape are sequentially connected to each other in the circumferential direction. It is a ring-shaped assembly.

As shown in FIG. 4, the main material (8a) has its both end portions bent slightly inward, and the front and rear main material (8a) ( 8a) are integrally provided with end face plates (10) and (11) having connection holes (9) for connecting them, and a splice material () is provided on both sides in the vicinity of the front end face plate (10). A connecting plate piece (14) having a hole (13) through which a bolt (12) projecting from the end face of (8b) abuts and a bolt (12) protruding from the end face is formed is integrally fixed.

In this way, the spacer member (8) including the main material (8a) and the joint material (8b) has the main material (8a) on the four sides of the inner peripheral surface of the rear trunk portion (1c) of the inclined shaft excavator (1). Propulsion jack installed (15)
Corresponding to the above, they are arranged on four sides on the circumference, and the front end portions of the facing side surfaces of the adjacent main materials (8a) and (8a) are connected by the joint material (8b) and are arranged on the lower peripheral side. Main material (8a) (8
Between the a), the free ends are not connected by the joint material (8b), and the chute (17) continuous in series with the chute (17) arranged in the interval (16) on the segment (6) side is provided in the interval. )
And the joint members (8a) and (8a) are rigidly connected by a reinforcing beam member (18).

(19) is brought into contact with or close to the facing side end faces of the main members (8a) and (8a) of the spacer member (8), and the main member (8a)
The rotation stopping member arranged in the length direction of the above-mentioned structure receives the main material (8a) to prevent the spacer member (8) from rotating.

The anti-rotation member (19) is fixed to the mine wall by a lock bolt (20), and its outer surface is slidably separated from each other without being integrated with the main material (8a).

The oblique excavator (1) is diagonally upward while supporting the reaction force of the oblique excavator (1) via the segment (6) configured as described above and a plurality of spacer members (8) connected in series. The excavation of the inclined shaft (a) by the excavator (1) and the assembling of the segment (6) and the spacer member (8) and the operation thereof will be described below.

In order to excavate in the ground consisting of rock layers from the downward slope end side to the diagonally upper side by the inclined shaft excavator (1), the gripper (5) provided on the rear body (1c) is used for the rear body (1c). The outer peripheral surface of the shaft is expanded in the radial direction to be crimped to the inner peripheral surface of the mine wall excavated by the inclined shaft excavator (1), while the gripper (4) disposed on the front body (1a) side is contracted. The inner peripheral surface of the mine wall, and in this state the cutter plate (2) is rotated and the thrust jack (3) is extended to support the reaction force on the rear body (1c) side while the front body ( 1a) is propelled and the rock is excavated.

When an inclined shaft of a certain length is excavated, the gripper (4) on the front body (1a) side is projected and pressed against the inner peripheral surface of the mine wall, while the gripper (5) on the rear body (1c) side is contracted. The rear body (1c) is pulled toward the front body (1a) by operating the thrust jack (3) in the contracting direction. At this time, the propulsion jack (15) is extended so that the propulsion jack (15) is always in contact with the spacer member (8).

While repeating such operations, the inclined shaft (a) is dug, while the segments (6) and the spacer members (8) are alternately assembled at desired lengths on the shaft wall of the inclined shaft (a) to be excavated. Go!

In the assembly, first, the segment (6) is assembled on the inner peripheral surface of the mine wall and is firmly fixed to the rock mass by the lock bolt (7). During the assembly of the segment (6), the front end surface of the segment (6) is The inclined shaft machine (1) is propelled in accordance with the excavation by the operation of the propulsion jack (15) while taking a reaction force to.

After assembling the segment (6) to a desired length so as to obtain necessary reaction force support, the rear end of the main material (8a) of the spacer member (8) is attached to the four ends of the segment (6) by bolts and nuts. The front facing surfaces of the main materials (8a) and (8a) which are adjacent to each other except the lower part are connected by the joint material (8b). At this time, first, the main material (8
After connecting a) to the segment (6), insert bolts (12) protruding from both ends of the joint material (8b) into the connecting plate pieces (14) and (14) of the adjacent main materials (8a) and (8a). Then, the nut is screwed to assemble the ring-shaped spacer member (8) whose lower part is loose.

The propulsion jack (15) of the inclined shaft excavator (1) is brought into contact with and supported by the front end surface of the main material (8a) of the spacer member (8), and the thrust jack (15) is opposed to the segment (6) via the spacer member (8). The inclined shaft excavator (1) is excavated while supporting the force.

When the excavation of the inclined shaft (a) corresponding to the length of the main material (8a) of the spacer member (8) is completed, the next spacer member (8) is attached to the end plate (10) at the front end of the spacer member (8). ) (1
1) The connection holes (9) and (9) are connected to each other in a connected state by bolts and nuts, and are connected in series by connecting them to each other in series, and the segments (6) are connected via the spacer members (8) and (8). ) Is used to excavate the inclined shaft (a) by the excavator (1). When assembling the spacer member (8), the propulsion jack (15) at the assembly site is reduced.

In this way, the spacer members (8), (8), ... (8) are added every time the inclined shaft excavator (1) excavates a certain length of the inclined shaft, and from the side of the inclined shaft excavator (1) during the excavation. The main member (8a) connected in series tries to buckle due to the reaction force of the vertical member (8b), and the rotation reaction force is received by the rotation stopping member (19). .

After assembling the spacer member (8) of such a length that the inclined shaft excavator (1) can be propelled while surely supporting the segment (6) through the spacer member (8), the front end of the spacer member (8) is again provided. Assemble the next segment (6) to the desired length according to the excavation of the inclined shaft (a) by the excavator (1),
Subsequently, the spacer members (8) are sequentially assembled, and this work is repeated until the inclined shaft (a) of a predetermined length is placed in the bedrock.
Is to excavate.

The excavated rock (sludge) taken into the inclined shaft excavator (1) is discharged onto a series of chutes (17) inclined downward, and the inclined shaft is rolled or slid on the chutes (17). (A) It is carried out to the downward tilt end.

Also, splice materials (8b) (8b) for the front and rear spacer members (8) (8)
Prevent falling rocks and the like from mortar spraying on the exposed pit wall.

〔The invention's effect〕

As described above, according to the reaction force support structure in the inclined shaft excavator of the present invention, behind the inclined shaft excavator, the shaft wall is excavated by the excavator by a rock bolt on the entire circumferential surface of a constant length portion of the shaft. The segment fastened to the excavator is assembled, and a plurality of spacer members corresponding to the plurality of propulsion jacks arranged on the excavator are provided along the inner surface of the pit wall between the segment and the excavator. Because it intervenes,
The reaction force on the inclined shaft excavator side can be supported by a segment fixed to a desired length portion of the downhole via a spacer member, and this segment is firmly fixed to the downhole by lock bolts. Therefore, it is possible to reliably support a large reaction force from the excavator, and therefore to excavate the inclined shaft at a large angle upwards. Is something that can be done.

Further, the spacer member can be easily assembled to improve the excavation work efficiency by the inclined shaft excavator, and it is economical in terms of material cost and equipment cost. Since it is arranged corresponding to the plural propulsion jacks arranged, the reaction force at the time of excavation can be directly received by the segment through the spacer member, which enables smooth propulsion. Is.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a simplified perspective view of a state where an inclined shaft is being excavated, FIG. 2 is an enlarged vertical front view of a segment portion, and FIG. 3 is an enlarged vertical front view of a spacer member. 4 and 5 are perspective views of the main material of the spacer member. (1) ... Diagonal excavator, (1a) ... Front body, (1c) ... Rear body,
(2) ... Cutter plate, (3) ... Thrust jack,
(4) (5) ... Gripper, (6) ... Segment, (7)
... Lock bolt, (8) ... Spacer member, (8a) ... Main material, (8b) ... Joint material, (15) ... Propulsion jack, (16) ... Spacing part, (17) ... Chute, (19) ... Rotation Stop member, (20)
… Rock bolt, (a) …… Slope.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Takehisa Koike 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. Construction Department (72) Mamoru Konishi 1-3-10 Moto-Akasaka, Minato-ku, Tokyo No. Stock Company Okumura Gumi Tokyo Branch (72) Inventor Jiro Kawabe 1-3-10 Moto-Akasaka, Minato-ku, Tokyo Stock Company Okumura Gumi Tokyo Branch (72) Inventor Akizu Akizu 1-chome Moto Akasaka 3, Minato-ku, Tokyo No. 10 Okumura Gumi Tokyo Branch (72) Inventor Tomo Yoshikawa 1-3-10 Moto Akasaka, Minato-ku, Tokyo Okumura Gumi Tokyo Branch (72) Inventor Kozo Sakoi Chuo-ku, Kobe City, Hyogo Prefecture 3-1-1 Higashikawasaki-cho Kawasaki Heavy Industries Ltd. Kobe Factory (72) Inventor Kazuo Fujioka 3-1-1 Higashikawasaki-cho Chuo-ku, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Inside the company's Kobe factory (72) Inventor Aritaka Fukuda 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Inside Kawasaki Heavy Industries, Ltd.Kobe factory (72) Inventor Kazunori Yamanaka 3-chome, Higashi-kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. 1 Kawasaki Heavy Industries Ltd. Kobe factory

Claims (3)

[Claims] 1. A segment, which is fastened to a mine wall by a lock bolt, is assembled on the inner peripheral surface of a certain length portion of the mine wall excavated by the digging machine behind the inclined shaft excavator. Along the inner surface of the mine wall between the segment and the excavator, a plurality of spacer members corresponding to the plurality of propulsion jacks arranged in the excavator are interposed, and the anti-reverse of the oblique excavator is characterized. Force support structure. 2. A reaction force in an inclined shaft excavator according to claim 1, wherein the spacer member is composed of a main member elongated in the pit direction and a joint material connecting main members adjacent in the circumferential direction. Support structure. 3. The inclined shaft excavator according to claim 1, wherein the spacer member has a rotation stop member fixed to a pit wall that abuts a side surface of the main member to prevent the spacer member from rotating. Reaction force support structure in.