JPH0339522A - Open shield machine - Google Patents

Abstract

PURPOSE:To secure steady movement of movable boards for the title machine by making inside front parts of side wall boards on the right and the left of the open shield machine in U section a double structure having spaces, and by incorporating therein movable boards that are capable of being pushed forward by operation of jacks. CONSTITUTION:Excavation of soil is made on the front side or through the upper opening of a shield machine 1 and the excavated soil is discharged therefrom. As jacks 15 are extended and operated for pushing out of movable boards incorporated in double-wall structures of side wall boards 1a on the right and the left, the movable boards move forward being pushed out thereby. Then propulsion jacks 3 are extended and the shield machine 1 is moved forward thereby with reaction produced by existing underground structures 4 applied thereto and, at the same time, a cutting edge 17 of a bottom board 1c is thrust downward to prevent the shield machine 1 from becoming aloft. Then a pressing member 7 is moved forward with the propulsion jacks 3 contracted, and a space is secured between the underground structures 4 and the pressing member 7.

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 FIGS. 5 to 7. In the figure, l 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 1
The tips of the side walls 1a, lb and the bottom plate lc are formed as a cutting edge 2 having a triangular box shape in cross section, and propulsion jacks 3 are arranged rearward and vertically in the center or near the rear end of the side wall plates 1a, lb. do.

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 shield machine 1 is installed in the starting shaft 6, and earth and sand in front of the starting shaft 6 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 and a reaction force is taken by the reaction wall in the launch shaft 6 to advance the shield machine 1, and the first underground structure 4 made of a concrete box or the like is moved upward. It is suspended from the shield machine 1 and set behind the propulsion jack 3 which is retracted within the tail part ld of the shield machine 1.

Next, earth and sand is similarly excavated and discharged from the front or upper surface of the shield machine 1, and the shield machine 1 is advanced, and the first
The second underground structure 4 is suspended into the tail part ld of the shield machine 1 before the second underground structure 4. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, and as shown in FIG. Returning 5 is carried out, and when the open shield machine 1 reaches the reaching shaft (not shown), it is removed and the construction is completed.

In such an open shield machine, the shape of the cutting edge 2 is various, such as vertical, diagonal, or hooded.
It cannot respond to changes in soil quality within the construction area.

Furthermore, since excavation is carried out from the ground surface to the inside and front of the cutting edge 2, the earth and sand in front of the cutting edge loosens, causing displacement in the ground.

In order to deal with such problems, the inventor first invented an open shield machine as shown in Fig. 8, and filed a patent application in 1986-
The application was filed as No. 261553 (Japanese Unexamined Patent Publication No. 125198/1988).

This is done by opening one to several elongated slits 8 in the horizontal direction near the front ends of the left and right side wall plates 1a and lb, and installing one to several movable retaining plates along the outside of the side wall plates 1a and Ib. 9 is attached, and a bracket 10 is rigidly connected to this inner surface, and the bracket 10 is passed through the slit 8 to protrude inside the side wall plates 1a and lb, and is attached to the retaining jack 11 provided inside the side wall plates 1'a and 1b. It pivoted.

The upper and lower portions of the movable retaining plate 9 are fitted into guide rails 12 formed by rigidly connecting angles horizontally to the outside of the side wall plates 1a and lb.

In this way, by expanding and contracting the retaining jack 11, the movable retaining plate 9 can be moved forward and retracted from the front ends of the side wall plates 1a and lb.

[Problem to be solved by the invention]

However, in the case where the movable earth retaining plate 9 is provided as shown in FIG. As a result, friction increases. Furthermore, if the guide rail 12 is filled with earth and sand, the movable earth retaining plate 9 becomes difficult to move, and if the movable earth retaining plate 9 that protrudes greatly is subjected to a force that causes it to open outward from the soil, only the bracket eye O and the guide rail 12 will be able to move. This may not be enough to support the object, and there is a risk of deformation or damage.

An object of the present invention is to solve the above-mentioned problems of the conventional example, and to provide an open structure that allows the movable plate to be installed in front of the side wall plate without protruding outward and without taking up much space, and to ensure stable movement of the movable plate. Our goal is to provide shield machines.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an open shield machine having left and right side wall plates and a bottom plate and having a U-shaped cross section with openings at the front, rear and top surfaces. The movable plate was formed into a double-walled structure, and the movable plate was housed inside this so that it could be protruded forward with a jack.The movable plate was also a hollow body with a double wall structure, and the jack was connected to the inside with a pin at one end. The other end of the jack that comes out to the rear of the movable plate is connected to the side wall plate, a cutting edge is formed at the front end of the movable plate, and the inside of the double wall structure of the left and right side wall plates is divided into a plurality of upper and lower parts. The gist is to store a movable plate in each section.

[Function] According to the present invention as set forth in claim 1, the movable plate is housed within the double wall structure at the inner front portion of the left and right side wall plates, so that nothing is required to be provided on the outside of the side wall plates. When the jack is extended, the movable plate is pushed forward and protrudes from within the double wall, but at this time, the double wall acts like a holder to ensure stable movement. According to the present invention, since the jack is housed within the movable plate, the entire structure becomes compact.

According to the third aspect of the present invention, the cutting edge at the front end of the movable plate is located in front of the left and right side wall plates regardless of the position of the movable plate, so that cutting into the ground can be performed.

According to the present invention as set forth in claim 4, by selecting the number of protruding movable plates, it is possible to more appropriately respond to the ground situation.

〔Example〕

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

Fig. 1 is a vertical sectional side view showing a first embodiment of the open shield machine of the present invention, and Fig. 2 is a lateral plan view of the same. Reference numerals are attached.

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

1b and a bottom plate 1c that has the same length as the side wall plates 1a and lb and connects them.It is a U-shaped shield machine with openings on the front, rear, and top surfaces. The propulsion jacks 3 are disposed rearward in a vertically arranged manner, and the pressing member 7 is provided at the rear end, which is the same as in the conventional example.

As shown in detail in FIGS. 3 and 4, in the present invention, inner wall plates 13 are provided in parallel at the inner front parts of the left and right side wall plates 1a and 1b with an interval between them to form a double wall structure. .

A movable plate 14, which is also a hollow body with a double wall structure, is housed inside this double wall structure so as to be able to protrude forward. This movable plate 14 is longer than the double wall structure portion of the side wall plates 1a and lb, and its front end always protrudes beyond the front ends of the side wall plates 1a and lb.
Formed as.

The inside of the movable plate 14 is partitioned into front and rear parts, and a jack 15 is housed in the rear part with one end connected by a pin, and the other end of the jack 15 that comes out to the rear of the movable plate 14 is connected to the side wall plate 1a.
, connects to the lb side.

Further, the interior of the double wall structure of the left and right side wall plates 1a and 1b is divided into a plurality of stages vertically from above by horizontal plates 16, and the movable plate 14 and jack 15 are housed in each division.

Further, a cutting edge 17 is provided at the front end of the bottom plate 1c, and this cutting edge 17 is also a downwardly movable cutting edge with a built-in jack 18, and is arranged in horizontally divided sections.

The rear parts of the left and right side wall plates 1a, lb and the bottom plate 1c, which correspond to the tail part 1d of the open shield machine L, are made strong as hollow plates with internal reinforcing ribs 19 made of lattice-like partitions, and the rearmost part of the ceiling part is A hood 20 was installed protruding from the top.

Next, the method of use will be described, but since the outline of the open shield construction method using this method is the same as that of the conventional example, the details will be omitted.

Excavating earth and sand from the front or top opening of the shield machine,
Then, the soil is removed, and the propulsion jack 3 is extended to advance the shield 191 using the existing underground structure 4 as a reaction force.

Before making shield machine 1 dig in this way, jack 1
When the movable plate 5 is extended, the movable plate 14 is pushed forward and protrudes from within the double wall structure of the left and right side wall plates 1a and 1b, but at this time, the double wall acts like a holder to guide the movable plate 14. This ensures stable movement.

Moreover, since the movable plate 14 is always located inside the left and right side wall plates 1a, lb, nothing protrudes outside the side wall plates 1a, lb, and there is no resistance during digging.

The number of movable plates 14 to be protruded is selected in order from the top, and the movable plates 14 protruded in this way act as retaining plates, so when excavating from the ground surface with the inside and front part of the cutting edge 2. Even on soft ground, the earth and sand on the left and right side walls Fila, lb can be prevented from loosening and causing displacement in the ground.

Further, if the cutting edge 17 at the front end of the bottom plate 1c is appropriately projected downward, it can be prevented from digging into the ground and lifting the shields n and 1.

Next, the propulsion jack 3 is retracted, the pressing member 7 is moved forward, and a gap is secured between it and the front end of the existing underground structure 4.

A new underground structure 4 is suspended from the ground into the tail part ld of the shield machine 1, set so as to be connected to the front end of the existing underground structure 4, and the propulsion jack 3 is extended,
The shield machine 1 is moved forward, and the underground structures 4 are buried vertically in the ground while repeating the same process, and back-filled onto the underground structures 4 at the rear as shown in FIG. Apply 5.

〔Effect of the invention〕

The open shield machine of the present invention as described above has a movable plate at the front of the side wall plate, so it can respond to changes in soil quality within the first section, and prevents soil from loosening at the front and causing displacement in the ground. It is preventable.

Moreover, the movable plate can be provided at the front of the side wall plate without protruding outward, and there is no fear that it will act as a resistor and increase friction when the shield machine excavates.

Furthermore, the movable plate can be installed compactly without taking up much space, and stable movement can be ensured.

[Brief explanation of drawings]

FIG. 1 is a vertical side view showing a first embodiment of the open shield machine of the present invention, FIG. 2 is a cross-sectional plan view of the same, FIG. 3 is a cross-sectional plan view of the main parts, and FIG. Fig. 5 is a vertical side view showing a conventional example, Fig. 6 is a sectional view taken along the line A-A in Fig. 5, Fig. 7 is an explanatory diagram of the open shield method, and Fig. 8 is a main part showing another conventional example. FIG. 1... Open shield machine la, lb... Side wall plate 1c... Bottom plate 1d...
Tail part 2...Blade mouth 3...Propulsion jack 4.
...Underground structure 5...Backfilling 6...Starting shaft 7...Press member 8...Slit
9...Movable retaining plate■0...Bracket
11... Dome jack 12... Guide rail
13...Inner wall plate 14...Movable plate 15.
18... Jacket 16... Horizontal plate 17... Blade mouth 19... Reinforcement lip 20... Hood

Claims (4)

[Claims] (1) In an open shield machine with a U-shaped cross section that has left and right side wall plates and a bottom plate and is open at the front, rear, and top surfaces,
This open shield machine is characterized in that the inner front parts of the left and right side wall plates are formed into a double wall structure with a gap between them, and a movable plate is stored inside the double wall structure so that it can be protruded forward with a jack. (2) The movable plate is also a hollow body with a double wall structure, and the jack is housed inside the movable plate with one end connected by a pin, and the other end of the jack that comes out to the rear of the movable plate is connected to the side wall plate. The open shield machine described in paragraph 1. (3) The open shield machine according to claim 1 or claim 2, wherein a cutting edge is formed at the front end of the movable plate. (4) The open shield machine according to claim 1 or claim 3, wherein the inside of the double wall structure of the left and right side wall plates is divided into a plurality of upper and lower sections, and a movable plate is housed in each section.