JP2005030069A - Excavating-advancing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavating-advancing device, which can conduct an excavation and a advancing stably, minimally inhibiting the collapse of a facing due to the looseness of a natural ground and is available for constructing a pipe line having a rectangular cross section. <P>SOLUTION: In the excavating-advancing device having the rectangular cross section, in which a jacking pipe H having the rectangular cross section is connected at the rear end of an excavator 1 and pushed out in the excavating direction and the jacking pipe H having the rectangular cross section is extended, excavating the ground G by the excavator 1 and which constructs the pipe line having the rectangular cross section in the ground, two upper-lower horizontal rotating shafts 2 orthogonal in the excavating direction are installed while positions are displaced so that the upper side is projected in the excavating direction from the lower side at the front end section of the excavator 1 in the excavator 1. In the excavating-advancing device, a plurality of cutters 3 are projected extensively over sections among shaft ends in each rotating shaft 2, and the looseness of the natural ground in the case of an excavation and a advancing can be reduced by excavating the upper and lower sections of the ground G by stages from an upper section at a distance by the upper-lower cutters 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavation apparatus, and more particularly to a technique for enabling stable excavation while minimizing collapse of a face due to looseness of a natural ground.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an excavating apparatus for excavating, for example, in a rectangular cross section, one having a structure in which two upper and lower drum cutters rotating on a horizontal axis orthogonal to the excavating direction are attached to the tip of an excavator body (for example, a patent) Reference 1).
[0003]
By the way, since the upper and lower drum cutters are mounted at the same distance from the excavator body in the excavator, the earth and sand whose upper part of the face collapses directly hits the drum cutter and rotates when it is easy to loosen. There was a problem that it was hindered and stable digging was not possible. In addition, since the discharge path for excavated earth and sand is installed only in the lower stage, there is a problem that the excavated earth and sand cannot be discharged smoothly because the upper and lower water pressure and earth pressure cannot be handled separately. Furthermore, since the drum cutter is large and requires a large driving force, the cost is high, and application to a small / medium caliber machine is unsuitable.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-229774
[Problems to be solved by the invention]
The problem to be solved by the present invention is to eliminate these problems in the past, and to promote stably while minimizing the collapse of the face due to loosening of the ground, and even if the face pressure is different up and down, excavation An object of the present invention is to provide a propulsion device that can smoothly discharge earth and sand.
[0006]
[Means for Solving the Problems]
The configuration of the present invention that solves this problem is as follows.
1) A propulsion pipe is connected to the rear end of the excavator and pushed in the direction of excavation. The ground is excavated while feeding the additive to the face, and the excavated soil is mixed and stirred with the additive to discharge it. In the excavation device that builds a pipeline in the ground by adding subsequent propulsion pipes one after the other at the rear end, the cutter of the excavator is provided in multiple upper and lower stages, a partition is provided behind each cutter, and added to each partition The material inlet, the excavation soil and the mixture mud discharge port are provided respectively, and the upper cutter and partition are shifted so that they protrude from the lower cutter and partition in the direction of excavation, and the upper and lower parts of the ground are A digging device characterized in that the fall of the face can be reduced by digging at a distance from the top 2) The inclination angle of the imaginary line connecting the tips of each cutter is the repose angle of the face , Natural 1) or 2), wherein a pressure valve for adjusting the face pressure is provided on each earth discharge path so that the face pressure can be controlled independently in the vertical direction. Excavator 4) A structure in which a cutter of an excavator projects a plurality of claws on a horizontal rotating shaft perpendicular to the excavation direction across the shaft end, and uses a rectangular cross-section propulsion pipe to form a rectangular cross-section pipe It is in the excavation apparatus according to any one of 1) to 3) that can be constructed.
[0007]
[Action]
According to the present invention, since the upper and lower parts of the ground are excavated stepwise from the top with the upper and lower cutters shifted in the front and back positions, even if the ground is loose and the face tends to collapse, the upper cutter Is excavated before the collapse, and it is dug stably.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the upper and lower cutters of the present invention, it is desirable that the inclination angle of the imaginary line connecting the tips of the cutters is the repose angle of the face (an angle that does not collapse). A structure in which the inclination angle of the imaginary line can be changed by adjusting the position of the upper or lower cutter in the front-rear direction so as to cope with the difference in the angle of repose due to various geological features.
[0009]
In addition, since the soil discharge pressure may differ depending on the excavation position, a balloon-shaped pressure valve that adjusts the face pressure is provided in each soil discharge path that takes in from the mud discharge port and sends the excavated soil backward, and reduces the face pressure. It is desirable to be able to control the top and bottom independently.
[0010]
As a cutter for an excavator, in addition to a conventional ring cutter, when a structural cutter with a plurality of claws protruding from the end of a shaft on a horizontal rotating shaft is used, a rectangular cross-section tube is used using a rectangular cross-section propelling pipe A road can be built. Further, a cutter bit may be provided on the side surfaces of the cutters at both ends so that the outer shell can be drilled. Embodiments of the present invention will be specifically described below with reference to the drawings.
[0011]
【Example】
The embodiment shown in FIGS. 1 to 6 is an example in which the present invention is applied to an excavation apparatus for constructing a pipe having a rectangular cross section. FIG. 1 is an explanatory view of an excavator of the embodiment, FIG. 2 is a front view of the excavator of the embodiment, FIG. 3 is a perspective explanatory view of the excavator of the embodiment, and FIG. FIG. 5 is a cross-sectional view of the propulsion pipe of the embodiment, and FIG. 6 is an explanatory view showing a use state of the rectangular cross-section propulsion device of the embodiment.
[0012]
In the figure, 1 is an excavator, 1a is a casing, 1b is a partition wall, 1c is a mud discharge port, 1d is an injection port, 2 is a rotary shaft, 3 is a cutter, 3a is a cutter bit, 4 is an orthogonal shaft gear motor, and 4a is a cover. 5 is a discharge path, 6 is a pressure valve, 7 is a discharge tank, 8 is an additive injection path, A is a face, G is the ground, Ga is excavated soil, H is a propulsion pipe, and S is a drilling hole.
[0013]
As shown in FIGS. 1 to 4, the excavator 1 of the rectangular cross-section excavator of this embodiment has a curved shape by shifting the vertical position so that the upper side projects forward from the lower side to the front part of the box-shaped casing 1a. The partition walls 1b are formed, and each partition wall 1b is opened with a mud discharge port 1c for taking in the excavated earth and sand Ga and mud mud mud, and each of the partition walls 1b and the casing 1a is opened with an inlet port 1d for injecting mud mud mud into the face A. is doing.
[0014]
In front of each partition wall 1b, a horizontal rotating shaft 2 orthogonal to the excavation direction is pivotally supported by shifting the position so that the inclination angle θ of the imaginary line connecting the upper and lower horizontal shafts 2 becomes the repose angle of the face A. A plurality of claw-like cutters 3 are provided on each rotary shaft 2 in a double row across the ends of the shafts, and cutter bits 3a are provided on the side surfaces of the cutters 3 at both ends. An orthogonal shaft gear motor 4 composed of a hyponic speed reducer (trademark, manufactured by Sumitomo Heavy Industries, Ltd.) is disposed in each casing 1a, and a drive chain (not shown) is provided between the output shaft of each orthogonal shaft gear motor 4 and each rotary shaft 2. It is hanging.
[0015]
In the casing 1a, a drainage path 5 communicating from the tip mud outlet 1c is respectively piped rearward, and a balloon-like pressure valve 6 for adjusting the pressure of the face A is provided in the middle of each of the dirt paths 5, A drainage storage tank 7 for temporarily storing the excavated earth and sand Ga is connected to the discharge destination of the soil path 5 and the additive material injection path 8 leading from the inlet 1d is connected to the mud mud mud from a supply device (not shown). Can be sent out.
[0016]
In this embodiment, the excavator 1 is operated in the start shaft, and is pushed in the excavating direction by a hydraulic jack (not shown), and the ground G is excavated by injecting mud mud into the face A from each inlet 1d. Ga and mud mud are taken in from the mud outlet 1c and discharged by a conveyor or screw (not shown), a rectangular-section propelling pipe H is connected to the rear end of the excavator 1, and the rear end is pushed out by a hydraulic jack (not shown) and sequentially propelled. We will dig while adding pipe H.
[0017]
Here, the face A may collapse during excavation depending on the looseness of the natural ground, and the collapsed earth and sand directly hits the cutter of the excavator and hinders the advancement. However, in this embodiment, since the inclination angle θ of the imaginary line connecting the tips of the upper and lower cutters 3 is the repose angle of the face A, the upper cutter 3 is excavated before the fall even if the face A is easy to fall. As a result, stable excavation is possible without actually collapsing. Moreover, since the discharge of the excavated earth and sand Ga is performed independently, the discharge of the excavated earth and sand Ga can be smoothly performed by independently adjusting the pressure of the face A with each pressure valve 6 even if the pressure of the face A is different in the upper and lower portions. It became possible to do.
[0018]
7 and 8 show another example of the excavator of the embodiment. FIG. 7 is an explanatory view of an excavator of another example of the embodiment, and FIG. 8 is a perspective explanatory view of an excavator of another example of the embodiment. In the figure, 1e is a hood portion, and 1f is a groove portion.
[0019]
As shown in FIGS. 7 and 8, the excavator 1 according to another example of the embodiment extends the top of the casing 1a forward to form an edge-shaped hood portion 1e. A groove portion 1f through which the cutter 3 passes is formed. Therefore, even if the face A collapses due to the looseness of natural ground when excavation is stopped, the hood portion 1e protects it and makes it safe. Other reference numerals and configurations are the same as those in the embodiment.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to excavate stably while minimizing the collapse of the face due to the looseness of the natural ground, and it is possible to smoothly discharge the excavated sediment even if the face pressure differs vertically.・ It is possible to provide a digging device suitable for digging with small and medium caliber that can be easily reduced in weight.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an excavator according to an embodiment.
FIG. 2 is a front view of the excavator according to the embodiment.
FIG. 3 is a perspective explanatory view of the excavator of the embodiment.
FIG. 4 is a perspective explanatory view in a state where a cutter of the excavator of the embodiment is omitted.
FIG. 5 is a cross-sectional view of a propulsion pipe according to an embodiment.
FIG. 6 is an explanatory diagram showing a usage state of the rectangular cross-section excavator of the example.
FIG. 7 is an explanatory diagram of an excavator of another example of the embodiment.
FIG. 8 is an explanatory perspective view of an excavator of another example of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator 1a Casing 1b Bulkhead 1c Mud outlet 1d Inlet 1e Hood part 1f Groove part 2 Rotating shaft 3 Cutter 3a Cutter bit 4 Orthogonal shaft gear motor 4a Cover 5 Drain path 6 Pressure valve 7 Soil storage tank 8 Additive material injection path A Working face G Ground Ga Drilling earth and sand H Propulsion pipe S Drilling

Claims (4)

Connect the propulsion pipe to the rear end of the excavator and push it in the direction of excavation, excavate the ground while feeding the additive to the face, mix and agitate the excavated sediment with the additive, discharge it, and after the pushed propulsion pipe In the excavation apparatus that builds a pipeline in the ground by adding subsequent propulsion pipes one after the other, a plurality of upper and lower cutters are provided, a partition is provided behind each cutter, and an additive is added to each partition. The inlet and the excavation soil and the mud discharge port of the mixture are provided respectively, and the upper cutter and bulkhead are shifted so that they protrude from the lower cutter and bulkhead in the direction of excavation. An excavation apparatus characterized in that the fall of the face can be reduced by excavating at a distance in steps. The excavation device according to claim 1, wherein an inclination angle of an imaginary line connecting tips of the cutters is defined as a repose angle of the face, so that loosening of a natural ground can be prevented. The excavation device according to claim 1 or 2, wherein a pressure valve for adjusting the face pressure is provided in each earth discharge path so that the face pressure can be controlled independently from above and below. The excavator cutter has a structure in which a plurality of claws project from the end of a shaft on a horizontal rotation axis orthogonal to the direction of excavation, so that a rectangular cross-section pipe can be constructed using a rectangular cross-section propelling pipe The excavation apparatus according to any one of claims 1 to 3.

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