JP2005273205A - Opening part water cut-off structure and opening part water cut-off method in jacking construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening part water cut-off structure capable of surely preventing flowing-out of sediment water from clearance between a leading machine, a jacking box body and an opening part, even when an outside dimension of the leading machine and the jacking box body is largely different. <P>SOLUTION: This opening part water cut-off structure 6 is composed of a first annular blocking-up member 7 installed in the opening part 3 of an earth retaining wall 2 so as to block up the clearance between the leading machine 4 and the opening part 3, and a second annular blocking-up member 8 fixedly arranged on the outer periphery of the jacking box body 5 so that the front end contacts with the rear end of the leading machine 4. The second annular blocking-up member 8 is constituted so as to be fixed in a state of contacting over the whole periphery with the first annular blocking-up member 7, by releasing a fixation with the jacking box body 5 when the rear end of the leading machine 4 arrives in the first annular blocking-up member 7, and so as to fix in the contact with the first annular blocking-up member 7 at the whole periphery. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the propulsion method, the present invention provides a soil water from the gap between the opening machine and the opening machined from the opening provided in the shaft, and the gap between the propulsion box and the opening arranged at the rear end of the machine. It is related with the opening part water stop structure and the opening part water stop method in the propulsion method for preventing outflow etc.

  When constructing a space with a particularly large cross-sectional area by shield method or propulsion method, first construct a number of tunnels adjacent to each other with an excavator to surround the space to be constructed. In addition, a method is used in which concrete is filled in each tunnel to form an outer shell corresponding to the ceiling or wall of the space, and then the inside of the outer shell that becomes the space is excavated (for example, Patent Document 1). reference).

Japanese Examined Patent Publication No. 7-86320 (2nd page, Fig. 2)

In such a method, since a large number of tunnels serve as outer shells of space, it is necessary to construct adjacent tunnels so that there is no gap between them.
For this reason, when the propulsion method is used, as shown in FIG. 4, the outer dimension of the propelling box a is set smaller than the outer dimension of the leading machine b for excavation, and excavated by the leading machine b. The tunnel d is constructed by filling the gap between the ground and the propelling box a disposed at the rear end of the leading machine b with an improvement layer c such as mortar, and the leading machine b leads the adjacent tunnel e. The improved layer c of the tunnel d constructed in this way is excavated and constructed so as to overlap with the tunnel d somewhat.

By the way, when the method of constructing a relatively large space as in Patent Document 1 is performed using the propulsion method, there are the following problems including problems in the normal propulsion method.
<1> The wall surface of the vertical shaft is generally covered with a retaining wall such as concrete, and an opening through which the leading machine penetrates is provided.
For this reason, as a problem that may occur even in the normal propulsion method, when the leading machine penetrates a certain distance from the opening, earth and sand fluidized by groundwater flows into the shaft from the gap formed between the leading machine and the opening. There is a possibility of coming.
If the outer dimensions of the leading machine match the dimensions of the opening, inflow of earth and sand water should not occur even after the penetration of the leading machine, but in reality, the aircraft is slightly inclined or deformed during excavation. Therefore, it is difficult to make the shape and dimensions of the two completely coincide with each other, and a gap between the leading machine and the opening is unavoidable.
<2> Especially when there is a large difference in the external dimensions of the leading machine and the propelling box, when the leading machine penetrates from the opening and the propelling box reaches the opening, the propelling box and the opening A large gap will be created between the two.
Therefore, earth and sand water or the like may flow into the shaft from this gap.

  The present invention has been made to solve the above-described conventional problems, and even when the outer dimensions of the leading machine and the propulsion box are greatly different, the leading machine, the propulsion box, and the opening are not provided. An object of the present invention is to provide an opening water stop structure and an opening water stop method in a propulsion method capable of surely preventing outflow of earth and sand water from a gap.

  The opening water stop structure in the propulsion method of the present invention for achieving the above-described object has a leading machine that digs out from the opening provided in the shaft and an outer shape smaller than the outer shape of the leading machine. An opening water stop structure in the propulsion method for preventing earth and sand water from flowing out from the gap between the propulsion box disposed at the rear end of the machine and the opening. A first annular closing member attached to the opening so as to close the gap, and an annular member disposed on the outer periphery of the propelling box, and can be in contact with the first annular closing member over the entire circumference And a second annular closure member fixed so that the front end is in contact with the rear end of the leading machine, and the second annular closure member has a first annular closure member whose rear end is advanced by excavation When it reaches the inside, the fixing with the propelling box is released, and the first annular closing portion The by fixing in a state of contact over the entire circumference, it is to close the gap between the propulsion a box body and a first annular closing member.

  Further, the water stop method for the opening in the propulsion method of the present invention has a leading machine that digs from the opening provided in the shaft and an outer shape smaller than the outer shape of the leading machine, and is arranged at the rear end of the leading machine. An opening water stop method in a propulsion method for preventing earth and sand water from flowing out from a gap between a propulsion box and an opening, wherein a first annular closing member is attached to the opening and a leading machine A second annular closing member having a shape capable of closing the gap with the opening and being able to contact the first annular closing member over the entire circumference is provided on the outer periphery of the propelling box so that the front end is in contact with the rear end of the leading machine. When the rear end of the leading machine reaches the first annular closing member by excavation, the second annular closing member is released from being fixed to the propelling box, and the first annular By fixing the closure member so as to be in contact with the entire circumference, the propelling box and the first ring It is to close the gap between the closing member.

As described above, the opening water stop structure and the opening water stop method in the propulsion method of the present invention can obtain the following effects.
<1> Since the first annular blocking member attached to the opening closes the gap between the leading machine and the opening when the leading machine penetrates from the opening, the inflow of earth and sand water to the shaft is prevented, leading The machine can be started safely from the opening.
<2> When the rear end of the leading device reaches the first annular closing member by fixing and arranging the second annular closing member on the outer periphery of the propelling box so that the front end contacts the rear end of the leading device. At approximately the same time, the second annular closure member contacts the first annular closure member.
Therefore, by fixing the second annular closing member to the first annular closing member in this state, the clearance between the propulsion box and the opening is closed, so that there is a large difference in the outer dimensions of the leading machine and the propulsion box. Even if there is, it is possible to reliably prevent the inflow of earth and sand water into the shaft and continue the excavation work safely.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<1> Configuration of Opening In the propulsion method, as shown in FIG. 1, the opening 3 is provided in the concrete retaining wall 2 covered with the wall surface of the shaft 1.
Then, the leading machine 4 is penetrated from the opening 3 and a propelling box 5 arranged at the rear end of the leading machine 4 is pushed in to construct a tunnel.
The opening 3 corresponds to the cross-sectional outer shape of the leading machine 4 and is formed in a similar shape or a substantially similar shape (here circular shape) slightly larger than the cross-sectional outer shape of the leading machine 4.

<2> Opening water stop structure The open water stop structure 6 in the propulsion method of the present invention closes the gap between the leading machine 4 and the opening 3 and the gap between the propelling box 5 and the opening 3. This is to prevent earth and sand water from flowing out of the opening 3.
The opening water stop structure 6 includes a first annular closing member 7 and a second annular closing member 8.

<3> First annular closing member The first annular closing member 7 includes a first annular closing member main body 9 and a first entrance packing 10.
The first annular closing member main body 9 is fixedly attached to the surface of the earth retaining wall 2 along the opening 3.
The inner shape of the cross section of the first annular closing member main body 9 corresponds to the (axial direction) sectional outer shape of the leading machine 4, and is a similar or almost similar shape (here circular) slightly larger than the sectional outer shape of the leading machine 4 ).
The first entrance packing 10 is formed, for example, in an annular and plate shape with a rubber elastic material, and is provided on the rear end surface or the inlet side end surface of the first annular closing member body 9 over the entire circumference.
Further, the first entrance packing 10 has an inner end portion that is in contact with the outer periphery of the leading machine 4 when the leading machine 4 enters the first annular closing member body 9. 9 is provided so as to protrude inward from the inner end portion of 9.
The first annular closing member main body 9 can also be configured to be attached to the inner peripheral surface of the opening 3.
In this case, the opening 3 is formed in advance in a shape that matches the cross-sectional outline of the first annular closing member main body 9.

<4> Second annular closure member The second annular closure member 8 includes a second annular closure member main body 11 and a second entrance packing 12.
The second annular closing member main body 11 is fixedly disposed on the outer periphery of the propulsion box 5 by a fixing member 13 provided on the rear end side so that the front end or the front end surface is in contact with the rear end or rear end surface of the leading device 4.
For fixing the second annular closing member main body 11 to the propelling box 5 by the fixing member 13, a known method such as bolt fastening can be adopted.
Alternatively, the second annular closing member 8 or the second annular closing member main body 11 is positioned and fixed by being sandwiched between the fixing member 13 fixed to the propulsion box 5 and the rear end or rear end face of the propulsion excavator 9. It can also be configured.
The cross-sectional outer shape of the second annular closing member main body 11 is larger than the cross-sectional external shape of the leading machine 4 or substantially equal to the cross-sectional outer shape of the leading machine 4, and can contact the first annular closing member main body 9 over the entire circumference. Keep it like that.
Since the cross-sectional outer shape of the propulsion box 5 is formed in a shape (here, a square shape) having a size that fits within the cross-sectional outer shape of the leading machine 4, the cross-sectional inner shape of the second annular closure member body 11 is Corresponding to the cross-sectional outline of the box 5, it is formed in a similar shape or a substantially similar shape (here, a square shape) slightly larger than the cross-sectional outline of the propelling box 5.
The second entrance packing 12 is formed in a ring shape and a plate shape, for example, with a rubber elastic material, and is provided on the rear end surface of the second annular closing member main body 11 over the entire circumference.
The second entrance packing 12 is provided with an inner end projecting inward from the inner end of the second annular closing member main body 11 so as to come into contact with the outer periphery of the propelling box 5.
The second annular closing member 8 is fitted from the front end side of the propelling box 5 so that the inner end portion of the entrance packing 12 is elastically deformed forward and the second annular closing member main body 11 and the propulsion box. In a state of being in contact with the body 5, the outer periphery of the propelling box 5 is hermetically contacted.
Each of the entrance packings 10 and 12 has an inner end contacting the outer periphery of the leading machine 4 or the propelling box 5 such as a conventionally known brush, a plate that slides, or a plate that opens and closes. The thing of the structure which can prevent the outflow of earth and sand water from the opening part 3 can be employ | adopted widely.

<5> Penetration of the propulsion excavator The ground on the back of the retaining wall 2 provided with the opening 3 is previously improved by chemical injection or the like so that the earth and sand do not collapse.
The leading machine 4 penetrates the wall surface ground from the opening 3 by pressing the propelling box 5 arranged at the rear end portion with a jack (not shown) installed in the shaft 1.
At this time, as shown in FIG. 2, the first annular closing member 7 has the first annular sealing member 7 in which the inner end portion of the first entrance packing 10 is elastically deformed forward by the insertion of the leading device 4. In a state of entering between the closing member main body 9 and the leading machine 4, the outer periphery of the leading machine 4 is hermetically contacted.
Thereafter, the leading machine 4 digs while rubbing the inner end portion of the first entrance packing 10.
Therefore, when the leading machine 4 penetrates, the gap between the leading machine 4 and the opening 3 is closed by the first annular closing member 7 to achieve water tightness, and the inner end of the first entrance packing 10 However, since it is pressed against the outer periphery of the leading machine 4 in a state of being bent forward against the outflow direction of the earth and sand water, the outflow of earth and sand water from the opening 3 is reliably prevented.

<6> Unlocking and fixing the second annular closing member The rear end of the leading machine 4 reaches the first annular closing member 7 by the digging after the penetration, and the second annular closing member main body 11 is the first annular closing member main body 11 When the annular closing member main body 9 is contacted over the entire circumference, the advancement of the leading machine 4 is temporarily stopped.
Next, the fixing member 13 is removed from the propulsion box 5 to release the second annular closing member main body 11 from being fixed to the propulsion box 5.
Then, the second annular closing member main body 11 is fixed to the first annular closing member main body 9 while maintaining contact with the first annular closing member main body 9.
As a result, the gap between the propelling box 5 and the opening 3 is closed to achieve water tightness.
As shown in FIG. 3, the inner end of the second entrance packing 12 is pressed against the outer periphery of the propulsion box 5 in a state of being bent forward against the outflow direction of earth and sand water. Even if the body 5 is pushed further forward, the contact state between the propelling box 5 and the second entrance packing 12 is maintained, and the outflow of earth and sand water from the opening 3 is reliably prevented.
If the 2nd annular closure member main part 11 is being fixed to the fixing member 13 with the volt | bolt, it can be comprised so that it may be fixed to the 1st annular closure member main body 9 using the volt | bolt.
In addition, after fixing the 2nd annular closure member main body 11 to the 1st annular closure member main body 9, you may comprise so that fixation with the propelling box 5 may be cancelled | released.

<7> Construction of Tunnel After the second annular closing member main body 11 is fixed to the first annular closing member main body 9, the propulsion box 5 is pushed forward again to dig up the leading machine 4.
In order to stabilize the ground cutting surface, the leading machine 4 is dug while adding a necessary amount of muddy water, and in order to suppress the pushing resistance of the propulsion box 5, a lubricant is injected into the outer periphery of the propulsion box 5. While doing.
The sediment excavated by the leading machine 4 is carried out through the propelling box 5 by a slurry transport pump, a sediment transport pump, a screw conveyor or a belt conveyor.
When the excavation work by the leading machine 4 is completed, a backfilling injection material such as mortar is filled between the outer periphery of the propulsion box 5 and the ground excavation surface by the leading machine 4, and the backfilling injection material is hardened and the propulsion box is cured. A tunnel is constructed by forming an improved layer on the outer periphery of the body 5.
Also at this time, the back ring injection material is prevented from flowing into the shaft 1 from the opening 3 by the first annular closure member 7 and the second annular closure member 8.

It is a block diagram of the propulsion method in which the opening part water stop structure of this invention is used. It is a figure for demonstrating the opening part water stop structure in a propulsion construction method. It is a figure for demonstrating the opening part water stop structure in a propulsion construction method. It is a figure for demonstrating the method to construct | assemble the large space using a propulsion construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vertical shaft 3 ... Opening part 4 ... Leader machine 5 ... Propulsion box 6 ... Opening water stop structure in propulsion method 7 ... ..First annular closing member 8... Second annular closing member

Claims (2)

The leading machine that digs up from the opening provided in the shaft and the outer shape of the leading machine is smaller than that of the leading machine. It is an opening water stop structure in the propulsion method for preventing outflow,
A first annular closing member attached to the opening so as to close the gap between the leading machine and the opening;
A second annular member arranged on the outer periphery of the propulsion box, having a shape that can contact the first annular closing member over the entire circumference, and fixed so that the front end is in contact with the rear end of the leading machine An occlusion member,
When the rear end of the leading machine reaches the first annular closure member by excavation, the second annular closure member releases the fixation with the propelling box and contacts the first annular closure member over the entire circumference. The opening water stop structure in the propulsion method is characterized in that the clearance between the propelling box and the first annular blocking member is closed by fixing in a state where the propulsion method is performed. The leading machine that digs up from the opening provided in the shaft and the outer shape of the leading machine is smaller than that of the leading machine. It is an opening water stop method in the propulsion method for preventing outflow,
A first annular closing member is attached to the opening to close the gap between the leading machine and the opening,
A second annular closing member having a shape that can contact the first annular closing member over the entire circumference is fixedly arranged on the outer periphery of the propelling box so that the front end is in contact with the rear end of the leading machine,
When the rear end of the leading machine reaches the first annular closing member by excavation, the second annular closing member is released from being fixed to the propelling box, and the entire circumference of the first annular closing member is attached to the first annular closing member. The opening water stop method in the propulsion method is characterized in that the clearance between the propelling box and the first annular blocking member is closed by being fixed so as to be in contact therewith.

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