JPH0672436B2 - Chain slit excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention is directed to the horizontal direction of slopes of unconsolidated ground such as sandy soil, cohesive soil or silt, tunnel face, etc. Alternatively, the present invention relates to a chain slit excavator capable of continuously excavating in a slit shape in the vertical direction.

“Conventional technology” When excavating slopes of unconsolidated ground such as sandy soil and silt or tunnel face, collapse of face and subsidence of the ground surface are likely to occur.

Therefore, prior to tunnel excavation, a large number of holes are excavated by slightly shifting the position with an auger, a trencher or the like to form excavation grooves extending in the tunnel crossing direction and the longitudinal direction around the tunnel arch portion. Then, a construction method is known in which fast-hardening concrete is placed in a slit-shaped excavation groove to construct a thin concrete arch shell for reinforcement, and a tunnel face is excavated.

A cutter loader is known as a tunnel machine, but it is not a machine that excavates in a slit shape, and it was not possible to excavate a deep excavation groove.

“Problems to be solved by the invention” As in the conventional example, when excavating a tunnel face while constructing a thin concrete arch shell, since there is no machine capable of excavating deeply in a slit shape, a large number of holes are formed with an auger or the like. There was a problem that the work efficiency was low because it had to be excavated one by one.

In addition, a narrow and long excavation groove with a large number of continuous holes has a problem that the inner surface of the groove becomes uneven and the thickness of the thin concrete shell becomes uneven, making it impossible to effectively use quick-hardening concrete. It was

Therefore, in order to make it possible to easily construct a narrow and long excavation groove, the present invention pulls out the excavation device that has been excavated vertically into the tunnel face and pushed in, and set it at the next position (adjacent or predetermined position). A chain slit excavator that can repeat the same excavation is provided.

[Means for Solving the Problem] The chain slit excavator of the present invention is, for example, a boom mounted on a workbench of a traveling heavy machine, a guide frame mounted on the tip of the boom, and the guide frame holding the excavator, and a guide. The excavator can be pushed by a jack along the frame. The excavator is designed to rotate the cutter drum with a motor via a chain,
Fins are attached to the chain so that the sand can be scraped out. Further, the cutter drum is formed in a shape having a large number of excavating blades on the outer circumference of the round shaft, and the rotation shaft thereof is provided so as to be substantially T-shaped with the longitudinal direction of the guide frame.

A pressing portion is provided at the tip of the guide frame so as to hold the guide frame in contact with a tunnel face or the like.

In addition, the boom is configured to be extendable and retractable, and a swinging device that swings on a vertical plane is provided at the base of the boom to move the boom tip in the vertical direction or the arc-shaped lateral direction, so that the excavator also moves. It is designed to let you.

[Operation] When using the chain slit excavator of the above means to construct a narrow and long excavation groove in a tunnel face, first, while the cutter drum is rotated by the motor through the chain, push it into the natural ground with a jack, Drill a vertical hole in a face. In this case, the excavated earth and sand are scraped out by the fins attached to the chain. After the drilling device has finished drilling a predetermined length, the cutter drum is pulled out, and the tip of the cutter drum is set at an adjacent or next predetermined position, and the same excavation is performed. The excavator can be moved to any position by expanding or contracting or rotating the boom. By this, a narrow and long excavation groove is constructed.

When the work range of the boom is exceeded, the excavator can be moved to any position by moving the traveling heavy equipment.

After this, if a quick-hardening concrete is placed in the slit-shaped excavation groove, a thin concrete arch shell is constructed,
It is possible to excavate a tunnel face safely and efficiently.

[Example] An example of the present invention will be described with reference to Figs.

The workbench 1a of the traveling heavy machine 1 is capable of turning on a horizontal plane, and the base of the boom 3 is attached to the workbench 1a via a turning device 2. The boom 3 is configured to be extendable / contractible by a hydraulic cylinder (not shown), and the swinging device 2 provided at the base of the boom 3 can swing the boom 3 in an arcuate lateral direction on a vertical plane. The turning device 2 is driven by a hydraulic motor (not shown).

At the tip of the boom 3, a rail-shaped guide frame 4 projecting forward of the heavy machine is swingably supported, and the guide frame 4 is operated by a hydraulic jack 5 attached to the tip of the boom 3. ing. The excavator 6 is slidably held on the upper surface of the guide frame 4, and the base of the excavator 6 is pushed along the guide frame 4 by a pair of hydraulic jacks 7 attached to the guide frame 4. .

The excavation device 6 is configured as follows.

A cutter drum 9 is rotatably provided at the tip of the long plate-shaped mount 8, and the cutter drum 9 is rotated by a hydraulic motor 10 provided at the base of the long plate-shaped mount 8 via a pair of chains 11. A plurality of fins 12 are attached to the chain 11 at small intervals. The cutter drum 9 is formed by providing a large number of excavating blades on the outer circumference of a round shaft, which excavates the ground by rotating from the top to the bottom as shown by the arrow in FIG. It is supposed to be scraped by. The rotary shaft of the cutter drum 9 is provided so as to be substantially T-shaped with the longitudinal direction of the guide frame 4, as shown in FIGS.

At the tip of the guide frame 4, there is provided a pressing portion 13 that comes into contact with the tunnel face, etc. The pressing portion 13 is provided on the tunnel face when the excavator 6 moves horizontally, vertically or in any direction. Since they are brought into contact with each other, the position holding of the excavation device 6 becomes stable.

[Advantages of the Invention] Since the tunstritt excavator of the present invention excavates the ground with an excavator having a round shaft-shaped cutter drum and a large number of fins, it is possible to scrape excavated soil while excavating. Further, the cutter drum 9 is formed in a shape having a large number of excavating blades on the outer circumference of the round shaft, and its rotation shaft is provided in a direction that is substantially T-shaped with the longitudinal direction of the guide frame 4, so that it has a rectangular cross section. You can drill. Further, since the excavator can be moved to any position in the vertical and horizontal directions by expanding and contracting the boom or rotating the swing base of the boom base, it is possible to easily excavate a narrow and long slit-shaped groove.

[Brief description of drawings]

FIG. 1 is a side view of a chain slit excavator of the present invention, FIG. 2 is a front view of the excavator, and FIG. 3 is a perspective view of an excavator. 2: Swivel device, 3: Boom 4: Guide frame, 6: Drilling device 7: Jack, 9: Cutter drum 10: Motor, 12: Fin

Front page continued (72) Inventor Hirokazu Kami, 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Kogyo Co., Ltd. (72) Yoichi Mimura 4-6-115 Sendagaya, Shibuya-ku, Tokyo Fujita Kogyo Within the corporation

Claims (3)

[Claims] 1. An excavator for mounting a boom base on a workbench, attaching a guide frame to the tip of the boom, and rotating a cutter drum by a motor through a chain attached with a sand scraping fin is held on the guide frame. A chain slit excavator, wherein the excavator can be pushed along a guide frame by a jack, and a pressing portion for holding the excavation device in contact with a tunnel face or the like is provided at the tip of the guide frame. 2. The chain slit excavator according to claim 1, wherein the boom is configured to be extendable and retractable, and a boom swinging device that swings on a vertical plane is provided at the base of the boom. 3. The cutter drum is formed in a shape having a large number of excavating blades on the outer circumference of a round shaft, and the rotation shaft is provided in a direction substantially in a T shape with the longitudinal direction of the guide frame. The chain slit excavator according to claim (1).