JP2019027096A - Open shield machine - Google Patents

Abstract

To provide an open shield machine capable of surely preventing the infiltration of sediment, etc., only by adding a simple structure to the shield machine, in the process of dividing a machine body into plural parts in a front and rear direction, and fitting the front end of the rear machine body into the rear end of the front machine body to be engaged with the gap remained, that is, making the mutual fitting portion bendable by loosely fitting them.SOLUTION: In an open shield machine provided with a center-folding part formed by dividing a machine body composed of left and right side walls plates and a base plate into a front part and a tail part in the front and rear direction, fitting a front end of the tail part into a rear end of the front part, and providing a center-folding jack on the front part toward the rear direction so as to make the front part and the tail part bendable at a mutual fitting portion, a side sediment infiltration prevention plate, on which the front end is fixed to the rear end of the front part to cover the front end of the tail part, at the side of the center-folding part.SELECTED DRAWING: Figure 1

Description

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

  As is well known, the open shield method is a rational method that makes use of the advantages of the open-cut method (open method) and shield method. There are some which are fitted with a front end and can be bent at a mutual fitting portion so that a curve can be constructed or a direction can be corrected.

  For example, as shown in FIG. 5, the open shield machine 1 is basically composed of left and right side wall plates 1a and 1b and a bottom plate 1c connecting the same between the side wall plates 1a and 1b. It is a shield machine which opened the front, back, and upper surface which consist of.

  As shown in FIG. 6, the open shield machine 1 is divided into a plurality of bodies in the front-rear direction, and the front end of the rear body as the tail portion 3 is fitted into the rear end of the front body as the front portion 2. The fitting part can be bent.

  The front portion 2 mainly performs excavation, and has a front end and an upper surface as open surfaces, and the middle jacks 4 are arranged on the left and right and rearward and rearward in a plurality of stages in the vertical direction.

  On the other hand, the tail portion 3 is used to install a concrete box 8. The shield jack 5 is arranged on the left and right sides of the shield jack 5 facing the front and rear in the machine body, and the jack portions 17 arranged in a plurality of upper and lower stages. The box suspension part 18 that secures a space behind is configured.

  In the figure, 6 is a movable split blade provided at the front end of the front portion 2, 7 is a side retaining plate provided at the rear end of the tail portion 3, 9 is a strut, and 10 is a press bar (push angle).

  As shown in FIGS. 7 to 10, the open shield method using such an open shield machine 1 is constructed between the start pit and the arrival pit. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated with a shovel excavator 12, and the shield jack 5 of the open shield machine 1 is extended to start the start pit 11 The open shield machine 1 is moved forward by taking the reaction force against the reaction wall inside, and the first concrete box 8 forming the underground structure is suspended from above, and within the tail part 3 of the open shield machine 1 Set with the strut 9 and the press bar 10 behind the shrunk shield jack 5.

  Further, the start pit 11 is constituted by a retaining wall such as a sheet pile, and in order to start the open shield machine 1, a part of the retaining wall 11 is mirror-cut, but if necessary, a front portion of the starting pit 11 by chemical injection or the like. The ground may be improved.

  Next, similarly, the excavator 12 excavates the earth and sand from the front surface or the upper surface of the front portion 2 and removes the soil to advance the open shield machine 1, and the second concrete box 8 is placed in front of the first concrete box 8. The concrete box 8 is suspended in the tail portion 3.

  Thereafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are successively buried in the ground in columns, and back dumped by the dump 14 on the concrete box 8 at the rear, and an open shield machine When 1 reaches the reaching mine 13, it is disassembled and removed to complete the construction. In the figure, 15 is a grout machine.

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

  At that time, if the left or right of the half-folded jack 4 is extended a lot, the front part 2 changes its direction to the opposite side and bends in that direction. Further, if the upper part or the lower part is extended a lot, 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 end of the tail part is fitted to the rear end of the front part with a gap, that is, loosely fitted, and groundwater or earth and sand enters from the gap, resulting in bending. There was a risk of losing extra space.

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

  Patent Document 1 describes an open shield machine in which the machine body is divided into a front part and a tail part in the front-rear direction, the front end of the tail part is fitted to the rear end of the front part, and can be bent at the mutual fitting part. A wire brush is disposed at a bent portion where the front portion and the tail portion 3 are joined.

  According to Patent Document 1, a wire brush is disposed in a gap in which the front end of the tail portion 3 is fitted with a gap at the rear end of the front portion, that is, loosely fitted, and this is filled with groundwater or earth and sand. To prevent.

  Although the said patent document 1 prevents a groundwater and earth and sand from entering with a wire brush, it is necessary to provide two wire brushes in order to prevent a groundwater and earth and sand from entering reliably, and also a front part. It is necessary to prevent the intrusion of groundwater and earth and sand by providing a partition wall and providing a tail front end partition wall at the tail portion and partitioning by this partition wall.

  The object of the present invention is to eliminate the inconvenience of the conventional example, the aircraft is divided into a plurality of parts in the front-rear direction, and the front end of the rear aircraft is fitted to the rear end of the front aircraft, and there is a gap, That is, it is an object of the present invention to provide an open shield machine that can reliably prevent intrusion of earth and sand, etc., simply by adding a simple configuration to the shield machine in order to allow loose fitting and bending at the mutual fitting portions.

  In order to achieve the above object, the present invention according to claim 1, the machine body composed of left and right side wall plates and a bottom plate is divided into a front part and a tail part in the front-rear direction, and the front end of the tail part is inserted into the rear end of the front part, In an open shield machine that has a center folding jack at the front, and a folding center that allows the front and tail to be bent at each other's fitting part. The gist of the present invention is to provide a side earth and sand intrusion prevention plate that is fixed to the end and covers the front end of the tail portion.

  According to the first aspect of the present invention, by providing the lateral sediment intrusion prevention plate, the lateral sediment intrusion prevention plate closes the opening at the fitting portion between the front portion and the tail portion. Intrusion can be reliably prevented.

  According to the second aspect of the present invention, the side earth and sand intrusion prevention plate projects a mounting receiving plate located one step deeper than the front side wall plate, and the front end is fixed to the mounting receiving plate. The gist of the invention is that it can be provided without protruding from the outer peripheral surface of the side wall.

  If the side earth and sand invasion prevention plate is locally attached to the open shield machine and has a structure 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 a natural mountain with excavation. Alternatively, the side ground is consolidated to cause lateral ground uplift. In addition, the side ground is loosened after passing the side sediment prevention board.

  According to the second aspect of the present invention, since the overhang corresponding to the thickness of the side sediment intrusion prevention plate is eliminated, it is possible to eliminate overcutting / consolidation of the side natural ground, and to loosen the side natural ground. Can be minimized.

  The gist of the present invention described in claim 3 is that the front end of the tail portion fitted into the rear end of the front portion has an outer surface arcuate in the front-rear direction.

  According to the third aspect of the present invention, since the front end of the tail portion fitted into the rear end of the front portion has an arcuate outer surface in the front-rear direction, the arc surface is in contact with the rear end inner side of the front portion and is in line contact. Bending can be performed smoothly with a small contact area close to.

  As described above, the open shield machine of the present invention divides the airframe into a plurality of parts in the front-rear direction, and the front end of the rear airframe is inserted into the rear end of the front airframe, and there is a gap, that is, In order to be able to be freely fitted and bendable at the mutual fitting portions, it is possible to reliably prevent intrusion of groundwater or earth and sand by simply adding a simple configuration to the shield machine.

  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 the main part of the same.

  As shown in FIG. 6, the entire open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, and the front end of the tail part 3 is reduced in diameter and enters the rear end of the front part 2. A gap is ensured between the tail portion 3 and the tail portion 3, and this becomes the middle bent portion 16.

  The front portion 2 has a front end and an upper surface having a movable split blade 6 as open surfaces, and the middle folding jacks 4 are arranged in the upper and lower stages in a left and right direction toward the rear in the machine body. In the figure, reference numeral 19 denotes a slide jack for the movable split blade 6.

  On the other hand, the tail part 3 has a shield jack 5 on the left and right sides of the body facing the rear in the body, and a jack part 17 arranged in a plurality of upper and lower stages, and a box suspension that secures a space behind it. Part 18 is configured.

  In the present invention, the front end of the tail portion 3 is reduced in diameter and enters the rear end of the front portion 2, but the outer surface of this portion is an arc 22 in the front-rear direction.

  Moreover, the side earth and sand invasion prevention board 21 by the iron plate was provided in the side of the folding part 16 so that the opening might be covered.

  The side earth and sand intrusion prevention plate 21 has a front end that is fixed to the rear end of the front portion 2 and covers the outer periphery of a portion that is not reduced in diameter at the front end of the tail portion 3 behind the reduced diameter portion.

  In the illustrated example, the lateral earth and sand intrusion prevention plate 21 is locally attached to the open shield machine 1 and has a wide structure that projects 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. The side earth and sand intrusion prevention plate 21 projects a mounting receiving plate 20 located one step deeper than the side wall plate 2a of the front portion 2. The front end is fixed to the mounting receiving plate 20 so that it is provided so as not to protrude from the outer peripheral surface of the side wall plate 2a of the front portion 2.

  Further, a concave portion 23 was formed on the outer periphery of the portion not reduced in diameter at the front end of the tail portion 3 at the rear of the reduced diameter portion, and the concave portion 23 received the thickness of the side sediment prevention plate 21.

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

  In this way, the open shield machine 1 divides the airframe into a plurality of parts in the front-rear direction, and the front end of the rear airframe is inserted into the rear end of the front airframe, and is fitted with a gap, that is, loosely fitted. In order to be able to bend at the mutual fitting parts, the intrusion of earth and sand can be prevented by providing the side earth and sand intrusion prevention plate 21.

It is a partial top view which shows 1st Embodiment of the open shield machine of this invention. It is an enlarged plan view of the principal part which shows 1st Embodiment of the open shield machine of this invention. It is a partial top view which shows 2nd Embodiment of the open shield machine of this invention. It is an enlarged plan view of the principal part which shows 2nd Embodiment of the open shield machine of this invention. It is a vertical front view which shows the outline | summary of an open shield machine. It is a vertical side view which shows the outline | summary of an open shield machine. It is a side view which shows the 1st process of an open shield method. It is a side view which shows the 2nd process of an open shield method. It is a side view which shows the 3rd process of an open shield method. It is a side view which shows the 4th process of an open shield 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 ... Middle folding jack 5 ... Shield jack 6 ... Movable division blade edge 7 ... Side earth retaining plate 8 ... Concrete Box 9 ... Strut 10 ... Press bar 11 ... Start pit 12 ... Excavator 13 ... Arrival pit 14 ... Dump 15 ... Grout machine 16 ... Folded part 17 ... Jack part 18 ... Box hanging part 19 ... Slide jack 20 ... Mounting plate 21 ... Side sediment entry prevention plate 22 ... Arc 23 ... Recess

Claims (3)

  The fuselage consisting of the left and right side wall plates and the bottom plate is divided into the front part and tail part in the front-rear direction, the front end of the tail part is fitted at the rear end of the front part, and the middle jack is provided at the front part toward the rear, and the front part The side where the front end is fixed to the front end of the front part of the open shield machine that forms a bent part that can be bent at the mating part and the front part is fixed to the front part of the tail part. An open shield machine with a landslide intrusion prevention plate.   The side earth and sand invasion prevention plate is provided with a mounting receiving plate located one step deeper than the front side wall plate, and the front end is fixed to this mounting receiving plate so that it does not protrude beyond the outer peripheral surface of the front side wall. The open shield machine according to claim 1, which can be provided.   The open shield machine according to claim 1 or 2, wherein the front end of the tail portion fitted into the rear end of the front portion has an outer surface arced in the front-rear direction.