JP2020111978A - Open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excavate and remove earth and sand in front of an opening on the front surface or an upper surface of an open shield machine, a process of extending a propulsion jack to make a concrete box a reaction force to advance the shield machine, and a tail of the shield machine. It is used in the open shield method of burying concrete boxes in columns by repeating the process of hanging and setting a new concrete box from above behind the propulsion jack that has been shrunk in the part, and protrudes from the left and right side wall plates. In an open shield machine with a slide box type movable split cutting edge, an open shield machine that does not affect the attitude control of the shield machine and the finished shape of the laying box, and does not have the risk of the slide box type not returning. offer. SOLUTION: A slide box 20 is provided with a movable portion 27 projecting to the side of the machine body at an acute-angled cutting edge portion, and the outer portion can be overcut by the movable portion 27. [Selection diagram] Fig. 1

Description

The present invention relates to an open shield machine used in an open shield construction method for constructing an underground structure such as a water supply/sewer system or an underground passage in an urban area.

As is well known, the open shield construction method is a rational construction method that takes advantage of the advantages of the open-cut construction method (open construction method) and the shield construction method. In this open shield construction method, the shield machine is placed at the rear end of the front body and the rear body The front end is fitted so that it can be bent at the fitting parts to allow curve construction and direction correction.

To describe one example thereof, the open shield machine 1 is basically a shield machine having front, rear and upper surfaces formed of left and right side wall plates and a bottom plate connecting the side wall plates.

As shown in FIG. 19, the open shield machine 1 divides the machine body into a plurality of parts in the front-back direction, and the front end of the front machine body as the front part 2 is fitted with the front end of the rear machine body as the tail part 3 so that the two parts are mutually connected. Bending is possible at the fitting part.

The front part 2 is mainly used for excavation, and has a front end and an upper surface as open faces, and the center folding jacks 4 are arranged rearward and rearward in the body, and are arranged in a plurality of upper and lower stages.

On the other hand, the tail portion 3 is for installing the concrete box 8, and the shield jack 5 is laid on the left and right toward the front in the body, and the jack portion 17 is arranged in a plurality of upper and lower stages. A box hanging part 18 that secures a space is formed behind it.

In the figure, 6 is a movable split blade opening provided at the front end of the front portion 2, 19 is a slide jack of this movable split blade opening, and 10 is a press bar (push angle).

The open shield construction method using such an open shield machine 1 is carried out between the starting pit and the reaching pit as shown in FIGS. 23 to 26. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated by the shovel excavator 12 installed on the ground, and the shield jack 5 of the open shield machine 1 is extended to start the start pit 11. In the tail part 3 of the open shield machine 1, the open shield machine 1 is moved forward by taking a reaction force against the reaction wall inside, and the first concrete box 8 forming the underground structure is suspended from above. Set behind the contracted shield jack 5 together with the strut and the press bar 10.

Further, the starting pit 11 is composed of a retaining wall such as a sheet pile. To start the open shield machine 1, a part of the retaining wall is cut into a mirror, but if necessary, a front portion of the starting pit 11 is filled with a chemical solution or the like. The ground may be improved on the ground.

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

Thereafter, the same excavation and setting process of the concrete box 8 is repeated to sequentially bury the concrete boxes 8 in the column in the ground, and the back of the concrete box 8 is backfilled with the dump 14 to open the shield machine. When 1 reaches the reaching pit 13, it is disassembled and removed to complete the construction. 15 is a grout machine in the figure.

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 portion 2 with respect to the tail portion 3 by the extension of the center folding jack 4. Push the jack 5 and the center folding jack 4 in two steps.

At this time, if either the left or right side of the center folding jack 4 is extended a lot, the front portion 2 turns to the opposite side and bends in that direction. Further, if either the top or the bottom is extended a lot, the front part 2 changes its direction to the opposite side and bends upward or downward. Such a curve construction or direction correction is possible.

As shown in FIG. 20, the movable split blade edge 6 is divided into a plurality of blade edges at the top and bottom in the horizontal direction as shown in FIG. 20, and a slide jack 19 slides forwardly from left and right side wall plates. The box 20 is formed by forming a front end of a side wall plate of the open shield machine 1 in a sliding door type into a box storage portion 21 as a door pocket and storing it in and out of the box storage portion 21.
Japanese Patent No. 3923973

The movable dividing blade opening 6 has a role of a slide earth retaining plate for preventing the collapse of the ground on the front side by projecting the movable dividing blade opening 6 from the left and right side wall plates.

In the conventional structure of the slide box 20 as the movable divided blade mouth 6, as shown in FIG. 21, a portion α where the ground cannot be cut remains on the outside of the slide box 20, and when the shield machine body digs in hard ground. Resistance of the shield machine was increased, and the attitude control of the shield machine and the finished form of the laid box tended to be affected.

Further, in the structure of the conventional slide box 20, as shown in FIG. 22, since the entire outer wall of the slide box 20 is in contact with the ground, the earth pressure tends to hinder the contraction operation of the slide box 20. ..

The object of the present invention is to solve the disadvantages of the conventional example and to influence the attitude control of the shield machine and the finished form of the laying box in an open shield machine having a slide box type movable split blade protruding from the left and right side walls. It is an object of the present invention to provide an open shield machine that is free from the risk of the slide box not returning.

In order to achieve the above object, the present invention provides a method for excavating and discharging earth and sand in front of an opening or a top opening of an open shield machine, and extending a propulsion jack to react a concrete box with a reaction force. The process of advancing the shield machine and the process of suspending and setting a new concrete box from the top behind the propulsion jack compressed in the tail part of the shield machine are appropriately repeated to sequentially bury the concrete boxes in tandem. In the open shield machine used in the open shield construction method, which has movable split blades of the slide box type protruding from the left and right side walls, the slide box is provided with a movable part protruding toward the side of the machine at the sharp tip blade edge. The gist is that the outer part can be overcut.

According to the present invention as set forth in claim 1, by providing the movable portion at the tip, the movable portion can overhang at the portion outside the slide box when the slide box is extended, and the portion can be overcut. It is expected that this will loosen the ground and reduce the resistance when the shield machine body is dug.

In the invention according to claim 2, the movable part is a movable pawl whose tip sharp-edged blade portion is rotated in a horizontal direction by a pin, and the tip of the movable pawl extends to the side of the machine body when extended. It is what

According to the second aspect of the present invention, by changing the tip end to be movable, the tip end portion of the claw can be extended to the outer side portion of the slide box when the slide box is extended, and the portion can be overcut.

The present invention according to claim 3 is characterized in that the movable claw has a side surface and a bottom surface as convex joint surfaces for rotation, and rotates in the direction opposite to the overhang direction when the slide box is contracted.

According to the third aspect of the present invention, it is necessary to return the tip portion of the claw protruding to the outer side portion of the slide box for overcutting when contracting, but when retracting the slide box, it rotates in the direction opposite to the protruding direction. Since it was done, it can be automatically returned.

Further, since a part of the ground contacting the slide box is cut when the slide box is extended, the earth pressure acting on the slide box is also reduced, and the contraction operation of the slide box can be expected to be improved.

The present invention according to claim 4 is characterized in that the movable claw is provided in a plurality of upper and lower stages.

According to the present invention as set forth in claim 4, it is expected that the movable claws are provided in a plurality of upper and lower stages to loosen the ground widely in the upper and lower sides and reduce the resistance when the shield machine body is dug.

The present invention as set forth in claim 5 is characterized in that the movable portion is a rotary disk cutter that is horizontally provided so that the circumference extends over the blade portion with an acute-angled tip.

According to the present invention as set forth in claim 5, the rotary disk cutter is provided horizontally at the sharp-edged blade tip portion so that the circumference overhangs, so that when the slide box is extended, the rotary disk cutter is located outside the slide box. It can be overhanged and overcut at that part.

The present invention according to claim 6 is characterized in that the rotary disk cutters are provided in a plurality of upper and lower stages.

According to the sixth aspect of the present invention, the rotary disk cutters are provided in a plurality of upper and lower stages, whereby it is expected that the ground can be widely loosened in the upper and lower portions and the resistance when the shield machine body is dug is reduced.

As described above, the open shield machine of the present invention is a shield machine in which the steps of excavating and discharging earth and sand in front of the front or upper surface opening of the open shield machine and extending the propulsion jack to make the concrete box a reaction force. Open shield method in which the concrete boxes are sequentially buried in tandem by repeatedly repeating the steps of advancing the concrete box and setting a new concrete box hanging from the top behind the propulsion jack that has been compressed in the tail part of the shield machine. In an open shield machine with a sliding box type movable split blade protruding from the left and right side walls, it does not affect the posture control of the shield machine and the finished form of the laying box, and the slide box can be returned. There is no danger of disappearing.

It is a partial plan view of a main part showing a first embodiment of an open shield machine of the present invention. FIG. 3 is a partial plan view of a main part of the open shield machine according to the first embodiment of the present invention when the slide box is extended. FIG. 3 is a partial plan view of a main part of the open shield machine according to the first embodiment of the present invention when the slide box is contracted. It is a side view at the time of reduction which shows 1st Embodiment of the open shield machine of this invention. It is a top view at the time of reduction which shows 1st Embodiment of the open shield machine of this invention. It is a front view of FIG. It is a side view at the time of extension which shows 1st Embodiment of the open shield machine of this invention. It is a top view at the time of extension which shows 1st Embodiment of the open shield machine of this invention. It is a front view of FIG. It is a side view at the time of reduction which shows 2nd Embodiment of the open shield machine of this invention. It is a top view at the time of reduction which shows 2nd Embodiment of the open shield machine of this invention. FIG. 12 is a front view of FIG. 11. It is a side view at the time of extension which shows 2nd Embodiment of the open shield machine of this invention. It is a top view at the time of reduction which shows 2nd Embodiment of the open shield machine of this invention. It is a front view of FIG. It is a partial plan view of the essential part at the time of reduction which shows 2nd Embodiment of the open shield machine of this invention. It is a partial top view of the important section at the time of extension showing a 2nd embodiment of an open shield machine of the present invention. It is a partial top view of the important part at the time of return which shows 2nd Embodiment of the open shield machine of this invention. It is a cross-sectional top view which shows the outline of an open shield machine. It is a top view which shows a prior art example. It is a top view at the time of extension of the slide box which shows a conventional example. It is a top view at the time of contraction of a slide box showing a conventional example. 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 showing the 4th process of the open shield construction method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partial plan view of a main part showing a first embodiment of an open shield machine of the present invention, FIG. 2 is a plan view when the slide box is expanded, and FIG. 3 is a plan view when the slide box is contracted. The same components as those in FIGS. 20 to 22 showing examples are assigned the same reference numerals.

4 and 5 show the whole, the open shield machine 1 of the present invention has the same overall structure as the conventional example shown in FIG. Detailed description is omitted.

The open shield machine 1 of the present invention is also of a type in which the blade is divided into upper and lower movable split blades 6, and each of the divided blades independently projects forward, and a slide jack 19 is provided on the left and right side wall plates. This is due to the slide box 20 projecting forward from.

The movable split blade edge 6 is a sliding door type, and a front end portion of the side wall plate of the open shield machine 1 forms a box storage portion 21 as a door pocket, and the slide box 20 is stored in and out of the box storage portion 21.

The slide box 20 is provided with a movable portion 27 projecting to the side of the machine body at the tip of an acute-angled blade, and the outer portion can be overcut by the movable portion 27.

The movable portion 27 is a movable claw 23 in which the tip acute-angled blade portion is a split body having a substantially triangular shape in a plane and is rotatably supported by a pin 22 to rotate in the horizontal direction.

The movable claw 23 has an isosceles triangular shape, the oblique side 26 faces inward, and the side surface 24 and the bottom surface 25 are convex joint surfaces for rotation.

Although this convex joint surface is formed as an arc surface in the illustrated example, it may be a polygonal surface as long as it is a rotatable joint surface.

The movable claw 23 is a blade type, and the tip sharp-edged blade opening main body is used as a holder. As shown in FIGS. 7 and 9, the movable claw 23 is vertically arranged in a plurality of stages (in the drawing, with respect to one slide box 20). 3 to 4 pieces), and the slide box 20 itself is also provided in a plurality of upper and lower stages (3 stages in the figure) to form the movable split blade edge 6.

Further, as another embodiment, only one movable claw 23 may be provided for the acute-angled tip blade main body. In this case, the movable claw 23 has a vertical thickness.

Next, the usage will be described. As described with reference to FIG. 19, the open shield machine 1 having the movable divided blade mouth 6 has a step of excavating and discharging earth and sand in front of the front or upper surface opening, and extending the propulsion jack to react the concrete box with a reaction force. The process of advancing the shield machine and the process of suspending and setting a new concrete box from the top behind the propulsion jack compressed in the tail part of the shield machine are appropriately repeated to sequentially bury the concrete boxes in tandem. It is used in the open shield construction method.

The movable dividing blade opening 6 has a role of a slide earth retaining plate for preventing the collapse of the ground on the front side by projecting the movable dividing blade opening 6 from the left and right side wall plates.

As shown in FIG. 2, when the slide box 20 is extended by the slide jack 19, the tip of the movable claw 23 projects to the side of the machine body, and the outer portion is overcut.

Further, when the slide box 20 is contracted by the slide jack 19, the tip portion of the movable claw 23 is in a state of being separated from the ground as shown in FIG. In addition, since a part of the ground contacting the slide box when the slide box is extended is cut, there is a part γ where the earth pressure is reduced, so improvement of the contraction operation can be expected.

Further, when the slide box 20 is reduced by the slide jack 19, the movable claw 23 rotates in a direction opposite to the projecting direction of FIG. 2 due to friction of the side surface 24 and the bottom surface 25, which are convex joint surfaces for rotation.

As a result, the movable claw 23, which was protruding to the side of the machine body, automatically returns to the original state.

As shown in FIGS. 16 to 18 as the second embodiment of the present invention, the slide box 20 is provided with a movable portion 27 projecting to the side of the machine body at the tip sharp edge blade portion, while the movable portion 27 is provided at the tip sharp edge blade portion. The rotary disk cutter 28 is provided horizontally so that the circumference of the cutter extends horizontally.

The rotary disk cutter 28 is rotatable by a fixed pin 29 in the central horizontal direction.

As shown in FIGS. 10 and 12, the rotary disk cutter 28 is of a thin blade type, and one slide box 20 is provided with a plurality of upper and lower stages (3 to 4 in the figure), and the slide box 20 itself. Also, a plurality of stages (three stages in the figure) are provided above and below to form the movable split blade edge 6.

As another embodiment, one rotary disk cutter 28 may be provided for one slide box 20.

The usage and action are shown in FIGS. As shown in FIG. 16, a part or the whole of the front end portion of the conventional slide box has a structure in which the fixed pin 29 can be rotated and moved in the horizontal direction.

FIG. 17 shows a state in which the slide box 20 is extended. When the tip acute-angled blade mouth of the slide box 20 comes out, the rotary disk cutter 28 cuts the ground while rotating.

In the conventional slide box structure, a part that cannot cut the ground remains outside the slide box, and the resistance when the shield machine body digs is large on hard ground, and the posture control of the shield machine and the installation box can be closed. It tended to affect the shape.

By changing the tip of the rotary disk cutter 28 to be movable, the tip portion of the claw can overcut the outer portion of the slide box 20 when the slide box 20 is extended, and the resistance when the main body of the shield machine 1 is advanced. Can be expected to be reduced.

Further, when the slide box 20 shrinks, as shown in FIG. 18, the rotary disk cutter 28 rotates in the direction opposite to that at the time of extension, and the frictional force applied by the earth pressure can be reduced.

As described above, in the conventional slide box structure, since the entire outer wall of the box is in contact with the ground, the earth pressure tends to hinder the contraction operation of the slide box. By doing so, the tip of the slide box can reduce the frictional force that acts due to the side earth pressure when it contracts, and when the slide box extends, part of the ground contacting the slide box is cut, so the slide box Since the earth pressure acting on the slide box will be lightly eliminated, improvement of the contraction operation of the slide box can be expected.

1... Open shield machine 2... Front part 3... Tail part 4... Center-folding jack 5... Shield jack 6... Movable dividing blade 8... Concrete box 10... Press bar 11... Start pit 12... Excavator 13... Reach pit 14 ... Dump 15 ... Grout machine 17 ... Jack part 18 ... Box hanging part 19 ... Slide jack 20 ... Slide box 21 ... Box storage part 22 ... Pin 23 ... Movable claw 24 ... Side 25 ... Bottom face 26 ... Oblique side 27 ... Movable part 28... Rotating disk cutter 29... Fixed pin

Claims (6)

The process of excavating and discharging earth and sand in front of the front or top opening of the open shield machine, the process of extending the propulsion jack to make the concrete box a reaction force to advance the shield machine, and the contraction in the tail part of the shield machine. It is used in the open shield construction method in which concrete concrete boxes are hung vertically from above and set repeatedly behind the propulsion jack. In an open shield machine with movable split blades, the slide box is provided with a movable part that projects to the side of the machine at the tip sharp angled blade part, and the outer part can be overcut by this movable part. Machine. The open shield machine according to claim 1, wherein the movable portion is a movable pawl whose tip has an acute-angled blade edge portion that rotates in a horizontal direction by a pin, and the tip of the movable pawl projects toward the side of the machine body when extended. The open shield machine according to claim 2, wherein the movable claw has a side surface and a bottom surface which are convex joint surfaces for rotation, and rotates in a direction opposite to an overhang direction when the slide box is reduced. The open shield machine according to claim 2 or 3, wherein the movable claws are provided in a plurality of upper and lower stages. The open shield machine according to claim 1, wherein the movable portion is a rotary disk cutter that is horizontally provided so that a circumference thereof is projected to an acute-angled blade edge portion. The open shield machine according to claim 5, wherein the rotary disk cutters are provided in a plurality of upper and lower stages.