JP5231508B2 - Open shield machine - Google Patents

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 takes advantage of the open cut method (open method) and the shield method.

  First, with this open shield construction method, the front end of the rear aircraft is inserted into the rear end of the front aircraft, so that it can be bent at the mutual fitting part so that it can be bent and the direction can be corrected. There is what I did.

  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 the concrete box 8, and the shield jacks 5 are arranged on the left and right, and in a plurality of stages on the upper and lower sides, facing the front toward the rear in the body. In the figure, 6 is a movable split blade provided at the front end of the front portion 2, 7 is a 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 discharges it to advance the open shield machine 1, and the second concrete is placed in front of the first concrete box 8. The 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 object of the present invention is to eliminate the inconvenience of the conventional example, divide the aircraft into a plurality of parts in the front-rear direction, and fit the front end of the rear aircraft into the rear end of the front aircraft with a gap. That is, it is to provide 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 in order to allow free fitting and bending at the mutual fitting portion. .

In order to achieve the above object, according to the first aspect of the present invention, an airframe composed of left and right side wall plates and a bottom plate is divided into a front portion and a tail portion in the front-rear direction, and the front end of the tail portion is fitted into the rear end of the front portion. In the open shield machine that can be bent at the mutual fitting part, a wire brush is disposed at the middle bent part where the front part and the tail part are joined , and between the front part and the tail part, The gist is that one side is fixed to the lower surface of the beam material of the front part or the tail part by bolting or the like, and the other is fixed to the lower surface of the beam material and slidably joined without being fixed. .

  According to the first aspect of the present invention, the wire brush is disposed in the gap where the front end of the tail portion is fitted with the gap at the rear end of the front portion, that is, loosely fitted, Sediment prevents entry of earth and sand, and a girder material as a lifting prevention member restrains the front and tail parts up and down, thereby preventing entry of underground water and earth and sand from the bottom of the shield machine.

Furthermore, as an example in which the girders restrain the front part and the tail part up and down, it can be realized simply and rationally by using the beam part lower surface of the front part or the tail part.

The gist of the present invention described in claim 2 is that the wire brush is a left and right side wall plate and is provided in two in the front-rear direction of the bent portion.

According to the second aspect of the present invention, it is possible to more reliably prevent entry of groundwater or earth and sand by providing two wire brushes.

The gist of the present invention described in claim 3 is that the wire brush is also provided between the bottom plates.

According to the third aspect of the present invention, since there are originally few gaps between the bottom plates, there is little possibility that groundwater or earth and sand will enter from here, but safety can be seen by providing a wire brush here.

According to a fourth aspect of the present invention, the front portion is provided with a partition wall, and the tail portion is provided with a tail portion front end partition wall. The fifth aspect of the present invention is provided with a front portion provided with a partition wall, and the tail portion is provided with a tail portion front end partition wall. The gist is to provide.

According to this invention of Claim 4 , in addition to presence of a wire brush, a tail part front end partition is provided in a tail part, and invasion of groundwater or earth and sand can be prevented more by partitioning with this partition. Further, according to the present invention of claim 5, by providing a partition wall in the front part and providing a tail end front end partition wall in the tail part, against intrusion of groundwater and earth and sand from the face of the face of the shield machine bronze part However, a double penetration prevention effect can be expected by the front partition wall and the tail front partition wall.

  As described above, in the open shield machine of the present invention, the airframe is divided into a plurality of parts in the front-rear direction, and the front end of the rear airframe is fitted into the rear end of the front airframe, and is fitted with a gap. In other words, in order to be able to be freely fitted and bendable at the mutual fitting portions, it is possible to reliably prevent the intrusion of groundwater, earth and sand, etc., simply by 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 plan view showing a first embodiment of an open shield machine of the present invention, FIG. 2 is a longitudinal side view of the same, and FIG. 3 is a longitudinal front view of the same.

  As in the conventional example, the 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 two and the middle part 3, and this is a half-folded part 16.

  Both the front part 2 and the tail part 3 are constructed as a rectangular body by laying a beam plate 17 between the left and right side wall plates 1a and 1b. Of these, the front part 2 has an open front surface and a top surface having a movable split blade edge 6. The front partition wall 21 is formed at the center, and the middle jack 4 is disposed rearwardly and rearwardly of the front partition wall 21 in the body, and is arranged in a plurality of upper and lower stages.

  On the other hand, the tail portion 3 is provided with shield jacks 5 on the left and right sides of the aircraft body in the forward direction toward the rear, and in multiple upper and lower stages, and a retaining plate 7 is provided at the rear end.

  In the present invention, the wire brush 18 is disposed in the bent portion 16 where the front portion 2 and the tail portion 3 are joined. As shown in FIG. 2, the wire brush 18 is also provided between the front part 2 and the bottom plate 1 c of the tail part 3.

  The wire brush 18 is formed by binding one end of a large number of wires with a mounting bracket. In a shield method for tunnel excavation, a wire brush used as a tail seal of a shield machine is used as a stopper for back injection. Available.

  The wire brush 18 shown in FIG. 1 is a single line. However, as another embodiment, the left and right side wall plates 1a and 1b are provided in a double line with a gap in the front-rear direction of the center bent part 16. May be.

  Further, a girder 19 made of H-section steel was installed between the front part 2 and the tail part 3 without restricting the longitudinal movement of either the front part 2 or the tail part 3 as an anti-lifting member.

  The girder member 19 as the lifting prevention member is fixed to the lower surface of the beam member 17 of the front part 2 or the tail part 3 by bolting or the like, and the other is not slid to the lower surface of the beam member 17 so as to be slidable. Join.

  In the example shown in the figure, two girders 19 are projected in parallel from the front part 2 to the rear.

  Further, a tail portion front end partition wall 20 is provided at the front end of the tail portion 3, and the front end of the tail portion 3 is closed by the partition wall 20.

  In this way, the wire brush 18 is disposed in the gap where the front end of the tail part 3 is fitted with a gap at the rear end of the front part 2, that is, in the loose fit, which is filled with groundwater or earth and sand. In addition, the girder 19 restrains the front part 2 and the tail part 3 up and down, and can prevent the intrusion of groundwater and earth and sand from the bottom of the shield machine 1.

  In the above embodiment, the case where the open shield machine 1 is divided into two parts such as the front part 2 and the tail part 3 has been described. However, a middle machine is added between the front part 2 and the tail part 3 and divided into three parts. Even in the above case, the present invention can be applied.

It is a top view which shows 1st Embodiment of the open shield machine of this invention. It is a vertical side view which shows 1st Embodiment of the open shield machine of this invention. It is a vertical front view which shows 1st Embodiment of the open shield machine of this invention. It is a top view 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 3 ... Tail part 4 ... Middle folding jack 5 ... Shield jack 6 ... Movable division blade edge 7 ... Earth retaining plate 8 ... Concrete box 9 ... Strut 10 ... Press bar 11 ... Starting pit 12 ... Excavator 13 ... Arrival hole 14 ... Dump 15 ... Grout machine 16 ... Folding part 17 ... Beam plate 18 ... Wire brush 19 ... Girder material 20 ... Tail front end partition 21 ... Front partition

Claims (5)

In an open shield machine in which the fuselage consisting of left and right side wall plates and 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 fitted into the rear end of the front part, so that it can be bent at the mutual fitting part ,
A wire brush is placed in the middle part where the front part and tail part join,
Also, as a floating prevention member between the front and tail parts, one side is fixed to the lower surface of the beam material of the front part or tail part by bolting etc., and the other is slidable without being fixed to the lower surface of the beam material An open shield machine characterized by the construction of girders to be joined . Wire brush, the left and right side wall plates, open shield machine according to claim 1, wherein provided in duplicate to the center-folding unit front-rear direction. The open shield machine according to claim 1 or 2 , wherein the wire brush is also provided between the bottom plates. The open shield machine according to any one of claims 1 to 3 , wherein a tail portion front end partition wall is provided in the tail portion.   The open shield machine according to any one of claims 1 to 4, wherein a partition wall is provided at the front portion, and a tail end front partition wall is provided at the tail portion.

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