JPH03199525A - Open shield machine for large cross section - Google Patents

Abstract

PURPOSE:To carry out excavation progress without difficulty by partitioning the inside of a front opening of an open shield machine with a bulkhead in an advancing width direction, into multiple openings, and by forming the front end of the bulkhead as a blade port. CONSTITUTION:The inside of a front part opening formed between the respective side wall plates 1a, 1b of an open shield machine 1 is partitioned by a bulkhead 8 in an advancing width direction, into openings 91, 92, 93. The front end of the bulkhead 8 is formed as a blade port 10 lined in parallel with the blade opening 2. The excavation progress by the shield machine 1 is carried out at the same time in each opening, with excavating machines such as a shovel put in line on the ground according to the openings 91, 92, 93. Even the excavation of a large cross section can be carried out safely, without anticipation of the distruction of sediment, thanks to the bulkhead 8, and a process time for excavation can be shortened, because an excavating machine can be arranged on every partition.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an open shield machine used in the open shield construction method for constructing underground structures such as underground passages for water supply and sewage systems, public drains, telegraph and telephone lines, etc. in urban areas. Regarding.

[Conventional technology]

The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.

The outline is shown in FIG. 6 and FIG. 7. In the figure, 1 is an open shield machine, and this is the left and right side wall plates 1a.

This is a U-shaped shield machine with openings at the front, rear, and top surfaces, and is made up of a bottom plate 1b having the same length as the side wall plates 1a and lb and connecting them. The open shield machine
The tips of the side wall plates 1a, lb and the bottom plate 1c are formed with a triangular cross-section cutting edge of 2.2°, and a propulsion jack 3 is installed rearwardly and vertically in the center or near the rear end of the side wall plates 1a, lb. Place them side by side.

7 in the figure is a pressing member provided at the rear end of the propulsion jack 3;
Consists of a frame made of box steel or shaped steel.

This open shield machine 1 is installed in the starting shaft, and earth and sand in front of the starting shaft is excavated and discharged from the front or top opening of the shield machine 1. Then, the propulsion jack 3 of the shield machine 1 is extended to take a reaction force to the reaction wall in the launch shaft, and the shield machine 1 is advanced.
The underground structure 4 is suspended from above, and the shield machine 1
Set it behind the propulsion jack 3, which is retracted within the tail portion 1d of.

Next, an excavator 6 such as a shovel is used to similarly excavate earth and sand from the front or upper surface of the open shield machine 1 and remove the soil, and then the shield machine 1 is moved forward and placed in front of the first underground structure 4. The second underground structure 4 is suspended into the tail portion ld of the shield machine 1. Thereafter, the same process of digging and setting 40 underground structures is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied to the rear underground structures 4, and the open shield machine 1 reaches the reaching shaft, it is removed and the construction is completed.

(Problems to be Solved by the Invention) In recent years, the utilization of underground has been reconsidered, and underground structures such as public ditches and underground passages are also required to have large cross sections as shown in FIG.

However, the conventional open shield construction method was not suitable for burying such a large underground structure due to the shape of the shield machine.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the disadvantages of the conventional example and to provide an open shield machine that allows easy digging for burying underground structures with large cross sections.

[Means to solve the problem]

In order to achieve the above object, the present invention is an open shield machine in which a propulsion jack is disposed inside the left and right side wall plates and the front, rear and top surfaces are opened, and the inside of the front opening is partitioned in the width direction of travel by a partition wall. The gist is that the partition wall is divided into a plurality of openings, and the front end of this partition wall is formed as a cutting edge.

[Effect]

According to the present invention, excavation for causing the open shield machine to dig is carried out simultaneously for each opening by lining up a plurality of excavators such as shovels on the ground corresponding to the plurality of partitioned openings. Since the opening is divided into sections in this way, excavation of large sections can be carried out stably without fear of soil collapse.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing a first embodiment of the open shield machine of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a longitudinal sectional side view of the same, and FIGS. 6 and 7 show the conventional example. The same components are given the same reference numerals.

The open shield machine 1 has left and right side wall plates 1a.

1b and a bottom plate IC that has the same length as the side wall plates 1a, lb and connects them, and has an open front, rear, and top surface. The tip is formed as a cutting edge 2.2' with a triangular cross section,
It is the same as in the conventional example that the propulsion jaws and keys 3 are disposed rearward and vertically arranged inside the side wall plates 1a and 1b, and the pressing member 7 is provided at the rear end.

The open shield machine 1 of the present invention has a large overall cross-sectional shape so that only an underground structure 4 having a large cross section as shown in FIG. 5 can be suspended from the tail portion 1d of the open shield machine 1.

Further, the inside of the front opening formed between the side walls Fi1a and lb is divided in the traveling width direction by the partition wall 8, and a plurality of openings 919 are formed.
The front end of this partition wall 8 is divided into □, 93, and the front end of this partition wall 8 is
The cutting edge 10 is formed in parallel with the cutting edge 10.

The propulsion jack 3 and the pressing member 7 may also be provided at the center of the tail portion 1d.

Next, an open shield construction method using such an open shield machine will be explained.

The basic outline of the open shield method is the same as the conventional one, but this open shield machine 1 is installed in the starting shaft, and the earth and sand in front of the starting shaft is excavated from the front or top opening of the shield machine 1, and Remove soil. Then, the propulsion jack 3 of the shield machine 1 is extended and the reaction force is taken by the reaction wall in the launch shaft to advance the shield machine 1, and the first underground structure 4 made of a concrete box or the like is suspended from above. It is lowered, supported by the height adjustment member 12 behind the retracted propulsion jack 3 within the tail part ld of the shield machine 1, and installed.

Next, earth and sand is similarly excavated from the front or upper surface of the open shield machine 1 using an excavator such as a shovel, and the earth is removed, and the shield machine 1 is advanced to create the first underground structure 4.
Before this, the second underground structure 4 is suspended into the tail portion ld of the shield machine 1.

Thereafter, similar steps of digging and setting the underground structures 4 are repeated to sequentially bury the underground structures 4 in the ground in columns, and backfill the underground structures 4 at the rear.

Excavation during excavation by such open shield machine 1 is as follows:
A plurality of excavators such as Shoheru are lined up on the ground corresponding to the openings 91, 9□, and 93, and the drilling is carried out simultaneously for each opening.

[Effects of the Invention] The open shield machine of the present invention as described above has m-adic jacks arranged inside the left and right side wall plates and has openings on the front, rear, and top surfaces, and is capable of excavating large cross sections. The partition wall enables safe excavation without the risk of soil collapse, and the excavator can be placed in the partition cutter, reducing the time required for the excavation process.As a result, underground structures with large cross sections can be installed safely and quickly. It will be possible to construct it in

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view showing a first embodiment of the open shield machine of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a vertical cross-sectional side view of the same, and FIG. 4 is a cross-sectional plan view showing the same in use. , 5th
The figure is a vertical front view of the underground structure, FIG. 6 is a vertical side view showing a conventional example, and FIG. 7 is a cross-sectional plan view of the same. l...Open shield machine Ia, lb...Side wall plate 1d...Tail portion 2.2°...Blade mouth 4...Underground structure 6...Excavator 8...Partition wall 10...Blade mouth

Claims (1)

[Claims] In an open shield machine with propulsion jacks installed inside the left and right side wall plates and openings on the front, rear, and top surfaces, the inside of the front opening is partitioned in the width direction of travel by a partition wall and divided into multiple openings. An open shield machine for large cross sections, characterized by the front end of the wall being formed as a cutting edge.