JPH045397A - Obstacle cutting apparatus of sealed excavator - Google Patents

Abstract

PURPOSE:To simplify removal by rotating with a rotating shaft body mounted on a cutter head part with a reinforcing bar cutting bit and a concrete cutting bit placed with difference in levels on an outer peripheral side and a rotating driving apparatus for rotating the rotating shaft body. CONSTITUTION:Numerous cutter bits 7 for cutting dug soil are placed on a face plate of a cutter head 3 which is rotated by a driving source 2 on a front part of a sealed machine 1. A rotating shaft body 8 is rotatably supported between supporting members 3a of the cutter head 3 while a plurality of concrete cutting bits 9 and reinforcing bar cutting bits 10 are alternately provided on an outer peripheral side of the rotating shaft body 8. Further the concrete cutting bits 9 are placed on three sides of the rotating shaft body 8 to enable three-stage switching while the reinforcing bar cutting bits 10 are placed on four sides to enable four-stage switching. Thus removal is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an obstacle cutting device for a shield tunneling machine.

(Prior Art) In urban areas, foundation piles of existing buildings are buried all over the place, and in some cases, there are no records of the installation locations of these foundation piles. Before constructing an underground tunnel in such a place, polling is carried out at several points above the ground along the planned path through the shield to investigate the soil condition, but the presence or absence of obstacles has not yet been confirmed. They often have to dig, and may come across unexpected obstacles that cannot be predicted. This one-time obstacle removal work on a shield excavator is usually carried out from inside the machine, and after stabilizing the face by injecting chemicals, etc., the cutter head is gradually rotated to remove the cutter slit in the cutter head. Visually inspect and remove obstacles by gas cutting while changing their position. This cutting and removal work is all carried out manually by workers.

(Problems to be Solved by the Invention) Conventionally, when a sudden obstacle is encountered during shield excavation in an urban area, the following problems occur.

(1) Due to the suspension of shield excavation, the construction period will have to be extended.

(11) The aircraft will be damaged at the time of the encounter, and it will be necessary to investigate the soil quality of the face, spring water, and obstacles, and take countermeasures.

(in) It takes a lot of time and money to treat the face and cut and remove obstacles.

(1v) It is difficult to ensure the safety of workers removing obstacles.

The present invention was proposed in view of the above circumstances, and its purpose is to provide shield excavation in which the work of removing obstacles encountered during shield excavation can be carried out safely and easily without stopping the shield machine. The present invention provides a machine obstacle cutting device.

(Means for Solving the Problems) In order to achieve the above object, an obstacle cutting device for a shield excavator according to the present invention is mounted on a cutter head, and cuts reinforcing bars on the outer peripheral surface in the longitudinal direction. It is composed of a rotating shaft in which a bit and a concrete cutting bit are arranged with a difference in level from each other, and a rotation drive device for the rotating shaft.

(Function) Since the present invention is configured as described above, when a foundation pile, which is an underground obstacle, is encountered during shield excavation, the rotary shaft mounted on the cutter head is rotated by the rotary drive device. By doing this, the reinforcing bar cutting bit and the concrete cutting bit, which are arranged longitudinally on the outer peripheral surface of the rotating shaft body, are made to protrude in front of the cutter head, and in this state, the cutter head is driven and rotated to cut the foundation pile. Cutting the pile reinforcing bars and pile frame concrete.

At this time, since the reinforcing bar cutting bit and the concrete cutting bit are arranged with a difference in level, first the overlapping concrete part of the pile reinforcing bar in the foundation pile is cut, and then the pile frame concrete and the resisting reinforcing bar are cut. Thus, it is possible to easily and safely dispose of obstacles from inside the shield machine without relying on human power, without having to carry out face stabilization work such as chemical injection method.

Also, when the cutting bit is unusable due to wear and tear,
A new cutting bit can be moved to a cutting position by rotating the rotating shaft.

(Example) The present invention will be described below with reference to the illustrated embodiments.

At the front of the shield body (1), a face plate of a cutter head (3) rotated by a drive source (2) has slits (41 (5) arranged radially) opening into a chamber (6). A large number of cutter bits (7) for cutting excavated earth and sand are arranged on one side of the slit part (5).

Inside the slit part (4), the cutter head (3)
A box-shaped rotating shaft (8) is rotatably supported between the supporting members (3a) and (3b), which are part of the
A plurality of concrete cutting bits (9) and reinforcing bar cutting bits 001 are arranged alternately with steps as described later and are fixed to the outer circumferential surface of the rotating shaft (8) in the longitudinal direction. . Further, one end of the rotating shaft body (8) is connected to a rotational drive device G7J via a bearing (It) of a support member (3a) of a cutter throat (3). In the figure, the number 0 is the leading cutter bit. When the shield machine (1) excavates, the shield machine (1) is moved forward by taking a reaction force on one segment (a) by the shield jack 04), and the cut earth and sand are removed from the cutter slit parts (4) and (5) while rotating the cutter head (3). This is carried out by taking it into the chamber (6) from there and carrying it out to the rear of the shield body (1) by a screw conveyor 0ω.

Rotation is transmitted to the rotating shaft body 18) by a drive rotating device a which is engaged so as to be able to rotate forwardly and reversely, and is configured to rotate to a predetermined position when necessary.

(Iω is the rotating shaft body (8)
The cutting bit 001, which can be switched in three stages and has a carbide bit (10a) implanted on the surface of the rotating shaft (8), is fixed to the cutting bit (9) for reinforcing bars. It stands out in height. Remaining 1 of the rotating shaft body (8)
A leading cutter bit 031 is arranged on the surface.

(See Figure 4) The cutting bits (9) for reinforcing bars are arranged on the four sides of the rotating shaft (8) and can be switched in four stages. The cutting bit (9) with the cutter bit (9) planted therein is fixed with the cutting edge set at an acute angle, and its height is higher than that of the preceding cutter bit (03). (Refer to Figure 5) Normally, the cutter bit (7) is used to cut the earth and sand, but in parallel with this, the leading cutter bit (0) bites into the excavated surface, and the subsequent cutter bit (7) cuts into the excavated surface. It facilitates excavation, and the height of the leading cutter bit 0■ is higher than that of the cutter bit (
7) More prominent.

(See Fig. 6) Fig. 7 shows the relationship between the protruding heights of the respective focus points. If a reinforced concrete pile is buried underground in the excavation path of the shield excavator, the shield excavator will not be able to pass through it unless the pile, which is an obstacle in front of the shield excavator, is removed during excavation. If it is found that there is a pile that is an obstacle in the excavation route, it is necessary to cut it into small pieces and remove it. For reinforced concrete piles, the excavator first encounters the overlying concrete layer of the reinforcing bars, and then the anti-reinforcing bars, so the protrusion height of each bit from the front of the shield excavator's cutter bit is clear from Figure 7. As such, the position of the concrete cutting bit 00) is high first, then the reinforcing bar cutting bit (9), then the leading cutter bit 03).
, cutter bit (7) and steps AB and C are sequentially attached.

Thus, when the shield excavator excavates, the cutter head (3) is driven and rotated to cut the obstacles in front of the range that the shield excavator can pass through, but the cut pile is cut by the cutter slit member (4) (5). ) is taken into the chamber (6), mixed with ordinary excavated soil, and discharged to the rear of the shield machine by a screw conveyor (06).

When the obstacle removal work is completed, the rotating shaft body 0ω is rotated by the driving rotation device 02), the leading cutter bit side is projected beyond the cutter head (3), and the normal nod excavation work can be resumed. can.

Note that even when the excavation bit is unusable due to wear and tear, etc., the rotary shaft body (8) is rotated by the rotation drive device with zero force, and the cutting bit is moved to the cutting position.

(Effect of the invention) According to the present invention, even if there is a reinforced concrete pile buried in front of the shield excavator, the removal work can be carried out immediately and in a planned manner without stopping the excavator. Not only can the construction period be secured, but the cost for removing obstacles is not required. Further, since the work of removing obstacles can be carried out from inside the shield excavator without relying on human power, worker safety can be ensured.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view of a shield excavator equipped with an obstacle cutting device according to the present invention, FIG.
Part 3 is a cross-sectional plan view of the main parts of the cutting device, Figure 4 is a cross-sectional view of the concrete cutting bit, Figure 5 is a cross-sectional view of the reinforcing bar cutting bit, Figure 6 is a cross-sectional view of the preceding cutter bit, and Figure 6 is a cross-sectional view of the cutting bit. FIG. 7 is an explanatory diagram showing the protrusion height of each cutter pit. (1)...Shield body, (3)...Cutter head (4)...Cutter slit section, (6)...Chamber (7)...Cutter pit, (8)...Rotation Shaft body (9
)... Concrete cutting bit 00)... Rebar cutting bit, 02)... Rotation drive device. 11th!1

Claims (1)

[Claims] A rotary shaft mounted on the cutter head and having a reinforcing bar cutting bit and a concrete cutting bit disposed on the outer peripheral surface with a step difference from each other in the longitudinal direction, and a rotation drive device for the rotary shaft. An obstacle cutting device for a shield excavator, which is characterized by: