JP6646630B2 - Open shield machine - Google Patents

Description

  The present invention relates to an open shield machine used for an open shield method.

Known as the open shield method is a method rich in rationality which utilizes the advantages of open-cut method (open method) and shield tunneling, in this open shield tunneling, forward of the rear fuselage of the shield machine to the rear of the front of the aircraft There is a type in which the front portions of the left and right side walls and the bottom plate whose diameters are reduced are fitted from the body of the above-mentioned body, and can be bent at the mutual fitting portion to enable curve construction and direction correction.

  As an example, as shown in FIG. 5, the open shield machine 1 basically includes left and right side walls 1a, 1b and a bottom plate 1c, which is approximately the same length as the side walls 1a, 1b and connects between them. This is a shield machine with open front, rear and top surfaces.

The open shield machine 1 is divided into a plurality in the longitudinal direction of the machine body as shown in FIG. 6, the rear of the left and right side walls and bottom plates of the airframe of the tail portion 3 at the rear of the front of the aircraft as a front portion 2 is reduced in diameter The fitted front portions are fitted, and can be bent at the mutual fitting portions.

The front portion 2 is mainly used for excavation, and has a front end and an upper surface as open surfaces, and the middle folding jacks 4 are arranged left and right toward the middle portion in the airframe rearward, and are arranged in a plurality of vertical stages. .

  On the other hand, the tail section 3 is for installing the concrete box 8, and the shield jack 5 is shifted left and right toward the front and rearward in the airframe, and the jack section 17 arranged in a plurality of upper and lower stages. , A box hanging portion 18 having a space secured behind it.

  In the drawing, reference numeral 6 denotes a movable split blade provided at the front end of the front part 2, reference numeral 7 denotes a side retaining plate provided at the rear end of the tail part 3, reference numeral 9 denotes struts, and reference numeral 10 denotes a press bar (push angle).

  An open shield method using such an open shield machine 1 is constructed between a start pit and a destination pit as shown in FIGS. The open shield machine is assembled in the starting pit 11, the ground in front of the starting pit 11 is excavated by a shovel type excavator 12 installed on the ground, and the shield jack 5 of the open shield machine 1 is extended to start the starting pit 11 The open shield machine 1 is advanced by applying a reaction force to the reaction wall in the inside, the first concrete box 8 forming the underground structure is suspended from above, and the inside of the tail part 3 of the open shield machine 1 is suspended. It is set together with the strut 9 and the press bar 10 behind the contracted shield jack 5.

  The starting pit 11 is formed of a retaining wall such as a sheet pile. In order to start the open shield machine 1, a part of the retaining wall is mirror-cut. The ground improvement may be given to.

  Then, similarly, the excavator 12 excavates earth and sand from the front or upper surface of the front part 2 and discharges the earth to advance the open shield machine 1, so that the second shield is provided in front of the first concrete box 8. The concrete box 8 is suspended in the tail part 3.

  Hereinafter, the same excavation and setting steps of the concrete box 8 are repeated, and the concrete boxes 8 are sequentially buried in the ground in tandem, and backfilled with the dump 14 on the rear concrete box 8, and the open shield machine is provided. When 1 reaches the pit 13, it is disassembled and removed to complete the construction. In the figure, reference numeral 15 denotes a grouting machine.

  By the way, excavation of the open shield machine 1 is performed not only by extending the shield jack 5 but also by advancing the front portion 2 with respect to the tail portion 3 by fixing the shield jack 5 and extending the center folding jack 4. Pushing is performed in two stages of the jack 5 and the center fold jack 4.

  At this time, if one of the left and right of the center folding jack 4 is extended more, the front part 2 changes its direction to the opposite side and bends in that direction. Further, if any one of the upper and lower parts is extended, the front part 2 changes its direction to the opposite side and bends upward or downward. Such curve construction or direction correction is possible.

However, in the conventional shield machine, the front part of the tail part at the rear part of the front part and the front part reduced in diameter from the bottom plate are fitted with a gap, that is, loosely fitted. And the earth and sand may enter, and as a result, there is a possibility that the space for bending is lost.

The following patent document has been proposed as an open shield machine that can reliably prevent intrusion of groundwater, earth and sand, etc. by simply adding a simple configuration to the shield machine.
Japanese Patent No. 5231508

The above-mentioned Patent Document 1 divides the fuselage into a front part and a tail part in a front-rear direction, and a front part of the tail part which is smaller in diameter than a front part left and right side wall plate and a bottom plate is fitted into a rear part of the front part. In an open shield machine capable of bending at a portion, a wire brush is provided at a bent portion where a front portion and a tail portion 3 are joined.

According to Patent Literature 1, a wire brush is disposed in a gap in which a front portion of the tail portion 3 on the rear portion of the front portion and a front portion reduced in diameter from the bottom plate are fitted with a gap, that is, loosely fitted. This prevents groundwater and sediment from entering.

  Patent Document 1 discloses that a wire brush is used to prevent underground water and earth and sand from entering, but in order to reliably prevent underground water and earth and sand from entering, it is necessary to provide two wire brushes in addition to each other. It is necessary to further prevent infiltration of groundwater and earth and sand by providing a partition wall at the tail portion, and providing a tail portion front end partition wall at the tail portion, and partitioning the partition wall.

An object of the present invention is to solve the above-described disadvantages of the conventional example, divide the fuselage into a plurality of parts in the front-rear direction, and provide a rear part of the forward body with a front part in which the left and right side wall plates and the bottom plate are smaller in diameter than the front part of the rear body. Inserting and fitting with a gap in between, that is, loosely fitting and bendable at the mutual fitting portion, simply add a simple configuration to the shield machine to ensure the infiltration of earth and sand etc. It is an object of the present invention to provide an open shield machine that can prevent such a problem.

In order to achieve the above object, according to the present invention, there is provided a shield machine in which the front, rear and upper surfaces are entirely formed by left and right side walls and a bottom plate having a length similar to these side walls and connecting therebetween. in, in the longitudinal direction of the aircraft, divided into tail portion and a front portion consisting of a left and right side walls and bottom plates and left and right side walls and bottom plates ing, left and right side walls at the rear of the front portion consisting of the left and right side walls and bottom plates The left and right side walls of the tail part consisting of a plate and a bottom plate and the bottom plate are fitted with the front part of the tail part which is smaller in diameter than the front part, and the front part and the tail part in the open shield machine to form a bending portion in which a bendable in the fitting portion, fixed to the intermediate folding portion outer side, the front end of the lateral soil intrusion prevention plate according to iron plate, the rear of the left and right side wall plates of the front portion is, reduced diameter of the tail portion And covering the front side portion, and extended to reach from the extension direction intermediate portion that is widened to the same diameter and the front portion of the tail portion to the rear, so as to cover the opening of the center-folding portion lateral soil intrusion prevention plate The gist is that it is provided in.

  According to the first aspect of the present invention, by providing the side earth and sand intrusion prevention plate, the side earth and sand intrusion prevention plate closes the opening of the front part and the tail part at the mutual fitting part, and prevents the earth and sand from entering. Intrusion can be reliably prevented.

According to a second aspect of the present invention, the side earth and sand intrusion prevention plate is provided with a mounting plate protruded from the outer surface of the front rear side wall plate one step inside, and the side earth and sand intrusion prevention plate made of an iron plate is provided on the mounting reception plate. The gist of the invention is that the front end is fixed so that the front end can be provided without protruding from the outer peripheral surface of the front portion side wall.

  If the side earth and sand intrusion prevention plate is locally attached to the open shield machine and the structure is wider than the machine width by the thickness of the iron plate, the side ground will be overcut during excavation. It is easy to pull the ground with excavation. Alternatively, the side ground is compacted to cause lateral ground uplift. Furthermore, after passing the side earth and sand intrusion prevention plate, the side ground is loosened.

  According to the second aspect of the present invention, since the overhang by the thickness of the side earth and sand intrusion prevention plate is eliminated, overcutting and consolidation of the side ground can be eliminated, and the side ground can be loosened. Can be minimized.

The gist of the present invention is that the front side portion of the tail portion , which is fitted into the rear portion of the front portion, is reduced in diameter in a front- rear direction.

According to the present invention of claim 3, since the front side portion and reduced diameter tail portion to be fitted into the rear end of the front portion is an arc in the longitudinal direction, the rear left and right side wall plates this arcuate surface is the front portion Bending can be performed smoothly with a small contact area close to the line contact with the inside.

As described above, the open shield machine of the present invention divides the fuselage into a plurality of parts in the front-rear direction, and fits the front part of the forward body with the reduced diameter of the left and right side wall plates and the bottom plate from the front body of the rear body. In order to fit with a gap, that is, loosely fit and bendable at the mutual fitting part, simply adding a simple configuration to the shield machine ensures the infiltration of groundwater, earth and sand, etc. Can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial plan view showing a first embodiment of the open shield machine of the present invention, and FIG. 2 is an enlarged plan view of a main part of the same.

As shown in FIG. 5, the entirety of the open shield machine 1 is basically composed of left and right side walls 1a, 1b and a bottom plate 1c having the same length as the side walls 1a, 1b and connecting therebetween. And a shield machine with an open top. One example is described with reference to FIG. 6. In FIG. 6, the fuselage is attached to a front part 2 composed of left and right side walls 1a, 1b and a bottom plate 1c and a tail part 3 composed of left and right side walls 1a, 1b and a bottom plate 1c. The left and right side walls and the bottom plate at the front part of the tail part 3 composed of the left and right side walls 1a, 1b and the bottom plate 1c are reduced in diameter and enter the rear part of the front part 2, thereby forming the front part. A gap is ensured between the tail portion 2 and the tail portion 3, and this serves as the center bent portion 16.

  The front portion 2 has a front end having a movable split blade 6 and an upper surface as an open surface, and the center-floating jack 4 is arranged left and right in a rearward direction in the machine body and is arranged in a plurality of upper and lower stages. In the figure, reference numeral 19 denotes a slide jack of the movable split blade 6.

  On the other hand, the tail part 3 has the shield jacks 5 arranged to the front and rearward in the fuselage and the jack parts 17 arranged in a plurality of upper and lower stages, and a box hanging with space secured behind. The unit 18 is constituted.

In the present invention, the left and right side wall plates and the bottom plate at the front part of the tail part 3 are reduced in diameter and enter the rear part of the front part 2.

Further, on the outer side of the center-folding portion 16, side walls of the left and right lateral soil intrusion prevention plate 21 by an iron plate so as to cover the opening of the center-folding portion 16 left and right side wall plates 1a of the front portion 2, a rear portion of 1b It was set only as to extend the.

The front end of the side earth and sand intrusion prevention plate 21 is fixed to the rear outside of the left and right side walls 1a and 1b of the front part 2 , and the diameter of the left and right side walls and the bottom plate is smaller than that of the front part at the front of the tail part 3. Behind the portion, the outer periphery of the portion of the tail portion 3 where the diameter is not reduced is covered.

  In the illustrated example, the side earth and sand intrusion prevention plate 21 is locally attached to the open shield machine 1 and has a wide structure that extends beyond the machine width by the thickness of the iron plate. That is, the front end corner of the side earth and sand intrusion prevention plate 21 protrudes.

FIGS. 3 and 4 show a second embodiment of the present invention, in which a side earth and sand intrusion prevention plate 21 is provided with a mounting receiving plate 20 located one step inside from the rear side wall plate 2a of the front part 2, and By fixing the front end to the mounting receiving plate 20, the front end 2 is provided so as not to protrude beyond the outer peripheral surface of the side wall plate 2a.

A recess 23 is formed in the front part of the tail part 3 at the outer periphery of the part where the diameter of the tail part 3 is not reduced behind the part where the left and right side wall plates and the bottom plate are reduced in diameter from the front part. The thickness of the side earth and sand intrusion prevention plate 21 was received.

  In this manner, the side earth and sand intrusion prevention plate 21 is flush with the side wall plate 2a of the front portion 2 and flush with the tail portion 3 as shown in FIG. 4, and the side of the open shield machine 1 is flat. It will be.

In this way, the open shield machine 1 divides the fuselage into a plurality of parts in the front-rear direction, and the front part in which the left and right side wall plates and the bottom plate are reduced in diameter from the front body of the rear body is fitted into the rear part of the front body . By providing the side earth and sand intrusion prevention plate 21 for fitting with a gap, that is, loosely fitting and making it bendable at the mutual fitting portion, intrusion of earth and sand can be prevented.

It is a partial plan view showing a first embodiment of the open shield machine of the present invention. FIG. 2 is an enlarged plan view of a main part showing the first embodiment of the open shield machine of the present invention. It is a partial plan view showing a second embodiment of the open shield machine of the present invention. It is an enlarged plan view of an important section showing a second embodiment of the open shield machine of the present invention. It is a vertical front view which shows the outline of an open shield machine. It is a vertical side view which shows the outline of an open shield machine. It is a side view which shows the 1st process of an open shield construction method. It is a side view which shows the 2nd process of an open shield construction method. It is a side view which shows the 3rd process of an open shield construction method. It is a side view which shows the 4th process of an open shield construction method.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front part 2a ... Side wall plate 3 ... Tail part 4 ... Center folding jack 5 ... Shield jack 6 ... Movable split blade opening 7 ... Side earth plate 8 ... Concrete Box 9 ... Strut 10 ... Press bar 11 ... Starting pit 12 ... Excavator 13 ... Destination pit 14 ... Dump 15 ... Grout machine 16 ... Center bending part 17 ... Jack part 18 ... Box hanging part 19 ... Slide jack 20 ... Mounting support plate 21 ... Side for preventing intrusion of side earth and sand 22 ... Circular arc 23 ... Recess

Claims (3)

Across the left and right side wall plates and these side walls and front consisting of a bottom plate for connecting therebetween with similar length, rear and top opening in the shield machine, in the longitudinal direction of the machine body, and left and right side walls and bottom plates the front section and divides the tail portion ing from the side wall and bottom plates of the left and right made of, to the rear of the front portion consisting of the left and right side walls and bottom plates, left and right side walls and bottom plates of the tail portion consisting of the left and right side walls and the bottom plate The front part of the tail part, which is smaller in diameter than the front part, was fitted, and a center-folding jack was provided on the front part toward the rear to form a center-bend part that allowed the front part and tail part to bend at the mutual fitting part. in the open shield machine, the center-folding unit out side, the front end of the lateral soil intrusion prevention plate according steel plate, is fixed to the rear of the left and right side wall plates of the front portion, diameter of the tail portion and the front side part And the front part of the tail part Extending from the extension direction intermediate portion that is widened to size so as to reach the rear, open shield machine, characterized in that provided so as to cover the opening of the center-folding portion lateral soil intrusion prevention plate. The side sediment intrusion prevention plate is provided with a mounting plate protruding from the outer surface of the front rear side wall plate one step inside, and the front end of the side sediment intrusion prevention plate made of iron plate is fixed to this mounting reception plate. The open shield machine according to claim 1, wherein the open shield machine can be provided without protruding from the outer peripheral surface of the side wall. The open shield machine according to claim 1 or 2, wherein a front side portion, in which a right and left side wall plate and a bottom plate of a tail portion fitted into a rear portion of the front portion are smaller in diameter than the front portion, has an arc in the front- rear direction.