JPH08338194A - Rectangular shield excavator - Google Patents

Abstract

PURPOSE: To provide a low-cost and general-purpose rectangular shield excavator by arranging multiple circular shield excavators inside outer shells rectangular in cross-section, supporting it by a mounting plate, and providing multiple fluid injection nozzles in the mounting plate. CONSTITUTION: Multiple circular shield excavators 4 are arranged inside outer shells 2 and 2 rectangular in cross-section, and the shield excavators 4 are supported by a mounting plate installed fixedly at the top end of the outer shells 2. Also multiple fluid injection holes 13, 13, 14,... are provided in the mounting plate. Then each shield excavator 4 is driven to excavate, and the natural ground which is surrounded by the shield excavator 4 and not capable of excavating is cut off by slurry injected from fluid injection nozzles 13 and 14. In addition, when the excavating is completed, each circular shield excavator 4 is removed, and can be assembled to the other rectangular shield excavator 1 or can be driven independently. Thus any desired rectangular shield excavator can be manufactured by properly selecting and combining normally used circular shield excavators 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for excavating a tunnel having a rectangular cross section.

[0002]

2. Description of the Related Art Conventionally, in a propulsion method with a rectangular cross section, a rectangular blade mouth with an open front surface is fitted to the tip of the rectangular pipe, and the rear end surface of the rectangular pipe is pressed by a propulsion device to move the rectangular blade mouth. It penetrates into the ground, enters the rectangular cutting edge and excavates earth and sand manually,
It is carried out of the shaft through the rectangular pipe. If the ground at the propulsion point is weak, it is recommended to use an auxiliary construction method such as chemical injection along the propulsion route to improve the ground and improve the self-sustainability of the ground of the rectangular blade edge to promote it. Has been adopted.

Further, in recent years, in propulsion construction in soft soil with a lot of groundwater, the effect of an auxiliary construction method such as chemical injection cannot be expected, and excavation is carried out while closing the facet of the tip to prevent the ground from collapsing. A rectangular shield machine utilizing circular shield water technology and earth pressure method shield machine technology has been developed.

[0004]

In the prior art in which the front face of the rectangular cutting edge is opened as described above, when the soil quality is relatively good, the face of the cutting edge is also self-supporting, so the earth and sand that penetrates into the rectangular cutting edge is excavated. There is no problem to do or carry out, but since the excavation is performed manually, if the rectangular pipe cross section becomes large, the time required for excavation will be extremely long, and further, since the excavation is performed manually, There is a problem such as a bad working environment.

Further, in the technology of the rectangular shield machine utilizing the technology of the mud pressure method and the earth pressure method which have been developed in recent years,
Even in the case of propulsion construction in soft soil with a lot of groundwater, mud pressure and earth pressure are generated on the face to keep the face and excavate and carry out the sand reliably. However, in order to cut a rectangular cross section, it is necessary to make a complicated mechanism so that the drum cutters are arranged in a rectangular shape or the front cutting cutter is eccentrically rotated so that the rectangular cross section can be excavated. Would be very expensive. In addition, in the propulsion method using a shield machine, the propulsion extension is usually relatively short compared to the shield method, so it is generally used repeatedly for several times, but it is generally used. In the case of a rectangular pipe, the size and shape of each orderer differ, and the size and shape are almost the same, and the rectangular shield machine cannot be used repeatedly.
It becomes an expensive machine with poor versatility.

Therefore, the present invention provides a rectangular shield machine which is relatively inexpensive and versatile in order to solve the above-mentioned problems of the prior art.

[0007]

That is, according to the present invention, an outer shell having a rectangular cross section, a plurality of circular shield excavators arranged inside the outer shell, and a fixedly mounted tip of the outer shell. It is characterized in that it is provided with a mounting plate for supporting a plurality of circular shield excavators, and a plurality of fluid ejection holes appropriately mounted on the mounting plate.

The outer shell is made of a steel material having a predetermined thickness so as not to be deformed by a load such as earth pressure or water pressure. The four corners of the tip of the outer shell may be obstructed when the ground is caught or the curve is deflected when the curve is propelled.

As the circular shield machine, a commonly used mud pressure shield machine or earth pressure type shield machine is used. As the size of the circular shield machine, inside the outer shell manufactured according to the shape of the rectangular pipe,
The size that can be arranged symmetrically is selected.

The circular shield machine installed inside the outer shell is supported and sealed by a seal material installed on mounting plates fixed at two points, the tip and the rear of the outer shell.

The position where the fluid ejection hole is provided is a non-excavable portion sandwiched between circular shield excavators, and muddy water or water is injected at high pressure to cut the natural ground.

[0012]

According to the above-mentioned invention, a rectangular shield excavator that meets a demand can be manufactured by appropriately selecting and combining circular shield excavators that are normally used according to the size of the rectangular pipe. . Excavation of a rectangular cross section is performed by rotating the tip face plate of each circular shield machine. The ground that cannot be excavated between the circular shield excavators is cut by muddy water, etc. ejected from the fluid ejection holes. Taken from the mouth. When the propulsion is complete, each circular shield machine can be removed and replaced with another rectangular shield machine or a single circular tube propulsion.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view illustrating a rectangular shield machine which is an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view illustrating a rectangular shield machine. FIG. 3 is a front view of a rectangular shield machine for explaining another embodiment of the present invention.

The structure of the rectangular shield machine 1 of the present invention will be described. Four circular shield machines 3 are fitted and incorporated in an outer shell 2 having a rectangular cross section. At the tip of the outer shell, a mounting plate 15 is fixedly installed to seal the gap between the circular shield machines 3. A front seal member 11 and a rear seal member 12 that support each circular shield machine 3 are installed on the mounting plate 15 on the outer periphery of each circular shield machine 3 to improve water blocking performance. A plurality of central fluid ejecting holes 13 and side fluid ejecting holes 1 are provided in the unexcavable portion sandwiched between the circular shield machines 3.
4 is equipped. The fluid ejection holes 13 and 14 are connected to a steel pipe or the like, and are connected to an injection pump installed at the rear, and serve as a mechanism for ejecting muddy water or water at high pressure (not shown). A face plate 4 equipped with a cutting tool is rotatably attached to the tip of the circular flat shield excavator 3 to excavate the natural ground. Inside each circular shield machine 3, there is a partition wall 1.
A mud pipe 6 is provided penetrating 6 to fill and circulate mud water before and after the face plate 4. The earth and sand excavated by the face plate 4 is taken in through the intake port 7 and is carried out together with the muddy water. Each of the mud-delivery pipes 6 becomes a collective mud-delivery pipe 10 in which the mud-delivery pipe and the mud-delivery pipe are collected by a pipe joint 8 behind the circular shield machine 3 and is piped to the vertical shaft side. Will be done.

In the present embodiment, the circular shield excavator 3 of the mud pressure system is exemplified, but it is also possible to arrange the circular shield excavators of the earth pressure system symmetrically to form a rectangular shield excavator. is there. Further, as the arrangement method, four circular shield excavators 3 have been exemplified, but the combination can be changed according to the shape and size of the rectangular conduit 17 as shown in FIG.

Next, the excavation method using the rectangular shield excavator 1 of the above invention will be described with reference to FIGS. 1 and 2. The rectangular shield excavator 1 is installed at a predetermined position in the shaft, and the driving machines 5 of the face plates 4 of the four circular shield excavators 3 fitted in the rectangular shield excavator 1 are operated to move the face plate 4 Rotate. The number of rotations of each face plate 4 is set to be the same. In parallel with the rotation of the face plate 4, muddy water is pressure-fed from the mud pipe to fill the muddy water before and after the face plate 4.
The earth and sand excavated by the rotation of the face plate 4 is taken into the circular shield machine 3 from the inlet 7 of the face plate 4 together with the muddy water, and is discharged rearward through the mud discharge pipe.

Further, the fluid ejection holes 13 provided in the unexcavable portion sandwiched between the circular shield excavators 3.
From 14, muddy water is injected to cut the ground. The cut earth and sand is carried out together with the earth and sand excavated by the circular shield machine 1. Along with the rotation of each face plate 4, the rectangular shield machine 1 is installed by the propulsion equipment installed behind the shaft.
Is pressed, the rectangular shield machine 1 and the rectangular pipe 17
Will be promoted.

In the case where the rectangular pipe conduit propulsion includes curved propulsion, a slightly larger excavation hole than the pipe conduit cross section is required for curve formation. Therefore, a widening bit is provided on the side surface portion of the face plate 4 of the circular shield machine 3. A method of equipping and coping is used. Further, when a curve is formed, it is possible to easily perform curve propulsion by changing the number of rotations of the left and right face plates 4 of the circular shield machine 3.

[0019]

EFFECTS OF THE INVENTION The rectangular shield machine of the present invention enables efficient construction by appropriately combining a circular shield machine that is normally used with a rectangular pipe with a shape and size changing each time the construction is carried out. At the same time, the manufacturing cost of the rectangular shield machine is newly developed and is much cheaper than the rectangular shield machine to be manufactured. Further, the rectangular shield excavator of the present invention can be used for other rectangular shield excavators by disassembling the assembly after completion of propulsion construction, or can be used as a circular shield excavator by itself, which is versatile. , Can be used effectively.

[0020]

[Brief description of drawings]

FIG. 1 is a front view illustrating a rectangular shield machine of the present invention.

FIG. 2 is a vertical cross-sectional view illustrating a rectangular shield machine according to the present invention.

FIG. 3 is a front view illustrating a rectangular shield machine which is another embodiment of the present invention.

[Explanation of symbols]

 1 rectangular shield excavator 2 outer shell 3 circular shield excavator 4 face plate 5 driver 6 sending and discharging mud pipe 7 intake port 8 pipe joint 9 reducer 10 collective sending and discharging pipe 11 front sealing material 12 rear sealing material 13 center Part fluid ejection hole 14 Side fluid ejection hole 15 Mounting plate 16 Partition wall 17 Rectangular pipe culvert

Claims (1)

[Claims] 1. A rectangular shield excavator for excavating a rectangular tunnel, wherein an outer shell having a rectangular cross section, a plurality of circular shield excavators arranged inside the outer shell, and the outer shell A rectangular shield machine having a mounting plate fixed to the tip of the base plate for supporting a plurality of circular shield machines, and a plurality of fluid ejection holes appropriately mounted on the mounting plate.