JP5989863B1 - Open shield machine - Google Patents

Abstract

An object of the present invention is to provide an open shield machine capable of preventing intrusion of ground water and earth and sand from the back of the open shield machine when construction is performed under high groundwater conditions. A machine body 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 to the rear end of the front portion, and the middle-folded jack is directed rearward to the front portion. In an open shield machine, a side earth retaining plate is provided in which an intermediate bent portion is formed so that the front portion and the tail portion can be bent at a mutual fitting portion, and a side earth retaining plate is provided by a hinge at the rear end of the tail portion. The rear earth retaining plate 22 can be disposed in the width direction of the open shield machine 1 so as to fall between the seven shields 7, and the water stop brush 23 is provided along the side and lower sides of the rear earth retaining plate 22. [Selection] 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. 6, 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. 7, 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 to each other. 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 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 FIG. 7, the lateral earth retaining plate 7 is movably attached to the rear end of the tail portion 3 with a hinge, and prevents the earth and sand from collapsing.

  As shown in FIGS. 8 to 11, 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.

  In the case of such curve construction or direction correction, the lateral earth retaining plate 7 can be moved to match the direction of travel of the open shield machine 1.

  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

  As shown in FIGS. 12 and 13, the airframe composed of the left and right side wall plates 1 a and 1 b and the bottom plate 1 c is divided into the front part 2 and the tail part 3 in the front-rear direction, and the front end of the tail part 3 is located at the rear end of the front part 2. In the open shield machine 1 that is inserted and bendable at the mutual fitting portion, a wire brush 18 is disposed at the middle bent portion 16 where the front portion 2 and the tail portion 3 are joined, and the front portion 2 and the tail Girder material that is fixed to the lower surface of the beam member 17 of the front part or tail part by bolting or the like and is slidably joined without being fixed to the lower surface of the beam member between the parts 3 as a floating prevention member 19 was installed.

  The wire brushes 18 are provided on the left and right side wall plates 1a and 1b in duplicate in the front-rear direction of the middle folded portion 16. The wire brush 18 is also provided between the bottom plates 1c. The front part 2 is provided with a partition wall 21, and the tail part front end partition wall 20 is provided at the tail part.

  According to Patent Document 1, a wire brush 18 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 2, that is, loosely fitted, and this is groundwater or earth and sand. The girder material 19 can restrain the front part 2 and the tail part 3 up and down as an anti-lifting member and prevent intrusion of groundwater and earth and sand from the bottom of the open shield machine 1.

  Furthermore, as an example in which the girder member 19 restrains the front part 2 and the tail part 3 up and down, it can be realized easily and rationally by using the beam part lower surface of the front part or the tail part.

  In Patent Document 1, the wire brush is provided between the left and right side wall plates and between the bottom plates of the open shield machine at the folded portion, but cannot be provided above. However, the open shield machine 1 is a shield machine having a front surface, a rear surface, and an upper surface that are formed of left and right side wall plates 1a and 1b and a bottom plate 1c that is approximately the same length as the side wall plates 1a and 1b and connects between them. This is because the upper surface is open.

  As described above, in Patent Document 1, groundwater and earth and sand from the fitting part of the front part and the tail part are prevented from entering, but consideration is given to groundwater and earth and sand that enter the concrete box from behind the tail part. Has not been made.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to prevent the invasion of groundwater and earth and sand from the back of an open shield machine that penetrates on the concrete box when the groundwater is constructed under high conditions. It is to provide an open shield machine that can do.

  In order to achieve the above-mentioned object, the airframe comprising the left and right side wall plates and the 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 inserted into the rear end of the front portion. A center folding jack is provided on the front part to the rear to form a middle folding part where the front part and the tail part can be bent at the mating part, and a lateral earth retaining plate is hinged to the rear end of the tail part. In the provided open shield machine, it is possible to arrange the rear earth retaining plate in the width direction of the open shield machine so that it falls between the side earth retaining plates, and that a water stop brush is provided along the lower side of the rear earth retaining plate. It is a summary.

  According to this invention of Claim 1, it installs so that a rear earth retaining plate may be dropped between side earth retaining plates, and the top of a concrete box is carried out by the water stop brush provided along the lower side of this rear earth retaining plate. It is possible to prevent intrusion of groundwater and earth and sand from the back of the open shield machine that is transmitted.

  In addition, the rear retaining plate can be installed as needed, such as when the open shield machine is stopped, and it can be removed when the lateral retaining plate is variable, such as when the open shield machine is curved or when the direction is corrected. There is no need to do.

  The gist of the present invention described in claim 2 is that the water stop brush is provided also along the side of the rear earth retaining plate.

  According to the second aspect of the present invention, the water stop brush provided along the side of the rear earth retaining plate comes into contact with the side earth retaining plate and can further prevent the intrusion of groundwater.

  The gist of the third aspect of the present invention is to install a counterweight on the rear earth retaining plate.

  According to the third aspect of the present invention, by installing the counterweight, the ground retaining plate and the water stop brush are always pressed against the top of the concrete box, so that the intrusion of groundwater above the box can be more reliably performed. Can be prevented.

  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 of a main part showing an embodiment of an open shield machine of the present invention, FIG. 2 is a vertical side view of the same, and FIG. 3 is a vertical front view of the same.

  As shown in FIGS. 13 and 14, 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 2 and the tail portion 3, and this becomes the middle bent portion 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 front and the rear, and in a plurality of upper and lower stages, and a lateral earth retaining plate 7 made of a steel plate is provided at the rear end.

  In the present invention, a rear retaining plate 22 made of a steel plate or a wooden plate can be disposed between the lateral retaining plates 7 in the width direction of the open shield machine 1, and a water stop brush 23 is formed along the side and lower sides of the rear retaining plate 22. Was established.

  The water stop brush 23 may be provided only on the lower side of the rear earth retaining plate 22.

  The water stop brush 23 is a wire brush, and is formed by binding one end of a large number of wires with a mounting bracket, and is used as a tail seal of a shield machine as a stop for back injection in a shield method in tunnel excavation. Wire brushes are available.

  A lateral earth retaining plate dropping guide 24 in which a side edge of the rear earth retaining plate 22 is fitted in the longitudinal direction is formed inside the lateral earth retaining plate 7, and between the lateral earth retaining plates 7 through the lateral earth retaining plate dropping guide 24. The rear earth retaining plate 22 was dropped.

  A round bar 25 for picking is pickled at the lower end of the rear earth retaining plate 22.

  Further, a shelf 27 is provided in front of the rear earth retaining plate 22, and a steel material as a counterweight 26 can be placed on the shelf 27.

  By installing the counterweight 26 made of this steel material, the rear earth retaining plate 22 and the water stop brush 23 can always be pressed against the top end of the concrete box 8.

  Next, the usage will be described. When the open shield construction method is applied and the groundwater level is high, the rear earth retaining plate 22 provided with the water stop brush 23 in a state where the open shield machine 1 is stopped is necessary. Set it between the side retaining plates 7 accordingly.

  In the figure, reference numeral 28 denotes a backfilling injection material disposed around the concrete box 8.

  By dropping the rear retaining plate 22 between the lateral retaining plates 7 and setting it in this way, the water stop brush 23 comes into contact with the top end of the concrete box 8 as shown in FIG. Can prevent the intrusion of groundwater.

  Moreover, when propelling the open shield machine 1, the rear earth retaining plate 22 may be removed, and in that case, the lateral earth retaining plate 7 can be moved.

It is a top view of the important section showing one embodiment of the open shield machine of the present invention. It is a vertical side view of the principal part which shows one Embodiment of the open shield machine of this invention. It is a vertical front view of the principal part which shows one Embodiment of the open shield machine of this invention. FIG. 2 is an enlarged detail view of FIG. FIG. 3 is an enlarged detail view of FIG. 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. It is a top view which shows a prior art example. It is a vertical side view which shows a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front part 3 ... Tail part 4 ... Folding jack 5 ... Shield jack 6 ... Movable split blade edge 7 ... Side 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 ... Beam plate 18 ... Wire brush 19 ... Girder material 20 ... Tail front end bulkhead 21 ... Front Partition wall 22 ... Back retaining plate 23 ... Water stop brush 24 ... Side retaining plate dropping guide 25 ... Round bar 26 ... Counterweight 27 ... Shelf 28 ... Backfilling primary injection material

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 In the open shield machine in which the side part of the tail part is bent at the mating part and the side part of the tail part is hinged at the rear end of the tail part, it is dropped between the side parts As described above, the open shield machine is characterized in that a rear earth retaining plate can be disposed in the width direction of the open shield machine, and a water stop brush is provided along the lower side of the rear earth retaining plate.   The open shield machine according to claim 1, wherein the water stop brush is provided along the side of the rear earth retaining plate.   The open shield machine according to claim 1 or 2, wherein a counterweight is installed on the rear earth retaining plate.

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