JP2010116735A - Entrance for starting shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an entrance for starting a shield machine wherein water cut-off members can be disposed with an interval in a shaft direction of a starting opening without deteriorating work efficiency in a vertical shaft at the start of the shield machine. <P>SOLUTION: The outer water cut-off member 22 and an outer ring metal fitting 24 are removed, and a worker goes back and forth in a clearance between a cutter of the tip of the shield machine and the side surface 16A of a concrete wall 16 so as to carry out work such as the cut and removal of a steel sheet pile etc. constituting an earth retaining wall from the inside of the starting entrance 18. Furthermore, when the work is finished, split bodies of the outer ring metal fitting are attached to the side surface 16A of the concrete wall 16 via split bodies of an inner ring metal fitting, and then the individual split bodies of the water cut-off members are attached to the split bodies of the outer ring metal fitting. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an entrance for starting a shield machine when starting a shield machine from a shaft.

When tunnel construction such as sewage pipes, gas pipes, power pipes, joint grooves, etc. is performed using a shield machine, after improving the ground, a vertical shaft is constructed using steel sheet piles, sheet pipes, or retaining walls such as SMW. An entrance for starting the shield machine is provided on the wall surface in the shaft.
The entrance includes a start port covered with concrete, for example, and the start port is formed with an inner diameter larger than the outer diameter of the body of the shield machine.
And, on the inner peripheral surface of the entrance of the launch port, there is a water stop member that elastically contacts the trunk of the shield machine in order to elastically contact the trunk of the shield machine and prevent the muddy water from flowing into the shaft when the shield machine starts. Provided.
This water stop member is a recess for allowing the front part to bend when the water pressure at the excavation part is large or the front part has a large bending range with respect to the rear part of the shield machine. Since a single water stop member cannot prevent the muddy water from flowing into the shaft, the water stop member is provided at two locations spaced apart in the axial direction of the starting port (patent) Literature 1, Patent Literature 2, Patent Literature 3).
JP-A-7-119381 JP-A-10-72996 JP 10-154822A

On the other hand, in tunnel construction performed in an urban area or the like, the shaft is constructed with a minimum size necessary for carrying a shield machine.
In such a case, if the water stop members are provided at two positions spaced apart in the axial direction of the starting port, the length of the starting port increases, and the thickness of the concrete wall increases accordingly. Workers cannot go back and forth between the cutter at the front end of the machine and the entrance, and work efficiency when the shield machine starts is reduced.
In more detail, it takes about two weeks for the shield machine to be brought into the shaft, assembled, and installed, and then the steel sheet pile that constitutes the retaining wall is removed from the inside of the starting port by using a gas cutter or the like. It is used to cut and remove.
Then, after the removal work is completed, the shield machine is advanced to perform excavation work by the shield machine.
Therefore, when tunnel construction is carried out in an urban area or the like, the shaft is constructed with the minimum size required to carry the shield machine, and the water stop members are provided at two locations spaced in the axial direction of the starting port. When the shield machine starts, the thickness of the entrance along the axis of the entrance increases, preventing workers from going back and forth between the cutter and the entrance at the tip of the shield machine, making it difficult to cut and remove steel sheet piles, etc. The efficiency of the work will be reduced.
The present invention has been devised in view of the above circumstances, and the object of the present invention is to provide a space in the axial direction of the start opening without reducing the efficiency of work in the shaft when starting the shield machine. An object of the present invention is to provide an entrance for starting a shield machine in which water stop members can be provided at two locations.

  In order to achieve the above object, the present invention comprises a concrete wall installed on the wall surface of a shaft and a start opening provided in the concrete wall, and the start opening has a size larger than the outer diameter of the trunk portion of the shield machine. An entrance for starting a shield machine formed with an inner diameter of the shaft, projecting radially inward from the outer periphery of the start port coaxially with the start port on a side surface of the concrete wall located opposite to the wall surface of the shaft. An annular inner water stop member extending in the circumferential direction and elastically contacting the outer peripheral surface of the body portion of the shield machine is provided, and the outer peripheral surface of the body portion of the shield machine is provided in front of the end of the start opening. An annular outer water stop member that can be elastically contacted is provided coaxially with the inner water stop member, and the outer water stop member is provided on an annular outer ring hardware attached to a side surface of the concrete wall. And said The side ring hardware is composed of a plurality of outer ring hardware divided bodies that are divided in the circumferential direction of the start opening and can be attached to and detached from the side surface of the concrete wall, and the outer water stop members are respectively provided for the outer ring hardware divided bodies. It is comprised by the attached several circular arc-shaped outer water stop member division body.

According to the present invention, by removing the outer water stop member and the outer ring hardware, a gap can be secured between the cutter at the tip of the shield machine and the side surface of the concrete wall, and the earth retaining wall is configured from this gap. Efficiently perform the work before starting the shield machine, such as cutting and removing steel sheet piles.
And after completion | finish of those work, an outer side water stop member is attached to the side surface of a concrete wall via an outer ring metal fitting, and a double water stop member is equipped in a start opening.
Also in this case, since the outer water stop member and the outer ring hardware are each composed of a divided body divided in the circumferential direction, it is possible to attach them efficiently.
Therefore, even when the tunnel is built to the minimum size necessary to carry the shield machine in tunnel construction that can be done in urban areas, etc., the thickness of the entrance can be minimized. It is possible to carry out tunnel excavation work with the equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a cross-sectional view of an entrance portion installed in a shaft, FIG. 2 is a front view of the entrance, FIG. 3A is a front view of an outer ring hardware, FIG. 4B is a side view thereof, and FIG. Explanatory drawing of the initial state of an outer side water stop member, (B) is explanatory drawing of the state which the outer side water stop member deform | transformed to the advancing direction of a shield machine, FIG. 5 (A) is a top view of a hinge, (B) is the front view 6A is a front view of the outer ring hardware, FIG. 7B is a side view thereof, FIG. 7A is an explanatory view of an initial state of the inner water-stopping member, and FIG. FIG. 8A is a plan view of a hinge, and FIG. 8B is a front view of the state in which the machine is deformed in the forward direction of the machine.
The shield machine starting entrance 10 includes a concrete wall 16 installed on a wall surface 14 in the shaft 12 and a starting port 18 provided in the concrete wall 16.
The starting port 18 has an inner diameter that is larger than the outer diameter of the body portion of the shield machine, and is arranged with its axis oriented in the horizontal direction (horizontal direction in the present embodiment).
And the inner side water stop member 20 is provided in the outer periphery of the one end part of the starting port 18 located opposite to the wall surface 14 of the shaft 12, and the outer side through the outer ring metal fitting 24 in front of the end part of the starting port 18 is provided. A water stop member 22 is provided.

As shown in FIG. 1, the inner water stop member 20 is attached to the side surface 16 </ b> A of the concrete wall 16 located opposite to the wall surface 14 of the shaft 12 via an inner ring hardware 26.
As shown in FIG. 3, the inner ring hardware 26 includes a plurality of inner ring hardware divided bodies 28 divided in the circumferential direction.
Each inner ring metal part 28 is formed of a thin metal plate, and includes a cylindrical plate part 2802 that forms the inner peripheral surface of the starting port 18, an annular plate part 2804 that stands up from the end of the cylindrical plate part 2802, and a circumferential direction. Reinforcing plate portions 2806 for connecting the cylindrical plate portion 2802 and the ring plate portion 2804 are provided at a plurality of intervals.
In a state where the plurality of inner ring metal parts 28 are attached to the concrete wall 16, the inner peripheral surface of the start port 18 is formed by the cylindrical plate portion 2802, and the ring plate portion 2804 is formed on the entire periphery of the edge of the start port 18. The side surface 16A of the concrete wall 16 and the annular plate portion 2804 are located on substantially the same plane.

The inner water blocking member 20 is formed in an annular plate shape by an elastic material such as rubber, and the inner diameter thereof is smaller than the outer diameter of the body part of the shield machine so as to elastically contact the outer peripheral surface of the body part of the shield machine. Have been in dimensions.
As shown in FIG. 4, the inner water stop member 20 is attached to the inner peripheral portion of the ring plate portion 2804 with a bolt and nut via a spacer 30, whereby the inner water stop member 20 is connected to the shaft center of the start port 18. Arranged on the same axis so that it protrudes radially inward of the start opening 18 without contacting the body of the shield machine, and its inner diameter is the initial position smaller than the outer diameter of the body of the shield machine. Is done. In the present embodiment, the initial position is a state in which the inner water stop member 20 protrudes radially inward within a plane orthogonal to the axis of the start port 18.
The inner water stop member 20 advances the shield machine at the time of start-up, inserts the cutter into the start port 18, and the front end of the cutter abuts against the wall portion of the shaft 12 or behind the cutter in the close state. It arrange | positions in the location elastically contacted by the outer peripheral surface of the trunk | drum which is located. Therefore, since the annular plate portion 2804 is located substantially on the same side as the side surface 16A of the concrete wall 16, the inner water blocking member 20 is disposed at a position that is the minimum necessary away from the wall surface 14 of the shaft 12, The thickness of the concrete wall 16 is also a minimum necessary thickness.

As shown in FIG. 4, inner stop in the direction opposite to the advancing direction of the shield machine from the initial position is provided at a plurality of locations spaced in the circumferential direction at locations where the inner water stop member 20 faces the outer water stop member 22. An inner flapper 32 that prevents deformation of the water member 20 is disposed.
The inner flapper 32 is formed of a thin plate made of a material having rigidity such as metal.
The inner flapper 32 has a base 3202 and a tip 3206 connected to the base 3202 via a hinge 3204. The base 3202 is attached to the annular plate 2804 together with the inner water stop member 20 by a bolt and nut, As a result, the inner flapper 32 is attached to the end of the start opening 18 via the inner ring hardware 26.
As shown in FIG. 5, the hinge 3204 is configured by inserting a shaft 3216 through a cylindrical portion 3212 formed in the base portion 3202 and a cylindrical portion 3214 formed in the tip portion 3206.
The hinge 3204 has a cylindrical portion 3212 formed on the base 3202, although the tip 3206 swings in the forward direction of the shield machine from the first state where the tip 3206 is located on the same plane as the base 3202. Opposite to the forward direction of the shield machine from the first state by coming into contact with the facing portion 3206 or by contacting the cylindrical portion 3214 formed in the leading portion 3206 with the facing base 3202 The inner water stop member 20 is prevented from being deformed in the direction opposite to the forward direction of the shield machine from the initial position.
1 and 2, reference numeral 34 denotes a grout fitting. The grout fitting 34 blocks a gap between the outer peripheral surface of the segment assembled in the start opening 18 and the inner peripheral surface of the start opening 18. It is for injecting cement and so on.

As shown in FIG. 1, the outer water stop member 22 is provided coaxially with the inner water stop member 20 via an annular outer ring hardware 24.
As shown in FIG. 6, the outer ring metal part 24 includes a plurality of outer ring metal parts 36 divided in the circumferential direction.
Each outer ring metal part 36 is formed of a thin metal plate, a mounting plate part 3602 attached to the outer peripheral part of the ring plate part 2804 with a bolt and nut, a cylindrical plate part 3604 standing up from the mounting plate part 3602, and a cylinder. An annular plate portion 3606 provided at the tip of the plate portion 3604, and an outer peripheral reinforcing plate portion that connects the mounting plate portion 3602, the cylindrical plate portion 3604, and the outer peripheral portion of the annular plate portion 3606 at a plurality of positions spaced in the circumferential direction. 3608 and an inner peripheral reinforcing plate portion 3610 that connects the cylindrical plate portion 3604 and the inner peripheral portion of the ring plate portion 3606 at a plurality of locations spaced in the circumferential direction.
With the mounting plate portion 3602 attached to the outer peripheral portion of the ring plate portion 2804 of the inner ring metal part 28, the ring plate portion 3606 is located on a plane parallel to the plane perpendicular to the axis of the start port 18. ing.

The outer water stop member 22 is formed in an annular plate shape by an elastic material such as rubber, and the inner diameter thereof is smaller than the outer diameter of the body part of the shield machine so as to elastically contact the outer peripheral surface of the body part of the shield machine. Have been in dimensions. In the present embodiment, as shown in FIG. 2, the inner diameter of the outer water blocking member 22 is slightly smaller than the inner diameter of the inner water blocking member 20.
The outer water stop member 22 includes a plurality of circular plate-shaped outer water stop member divisions 38 attached to the outer ring hardware divisions 36, respectively.
As shown in FIG. 7, the outer water blocking member divided body 38 is attached to the inner peripheral portion of the ring plate portion 3606 of the outer ring metal piece divided body 36 with a bolt and nut via a spacer 40, thereby the outer water blocking member 22. Is arranged coaxially with the inner water blocking member 20 in front of the end portion of the start port 18 (in front of the side surface 16A of the concrete wall 16), and in a state where it does not contact the trunk portion of the shield machine. It is arranged so that it projects inward in the radial direction and has an inner diameter that is smaller than the outer diameter of the body of the shield machine. In the present embodiment, the state where the outer water stop member 22 protrudes radially inward within a plane orthogonal to the axis of the start port 18 is the initial position.
In the initial position, the outer water stop member 22 is located at a location about 40 to 50 cm away from the side surface 16A of the concrete wall 16 in the present embodiment.

As shown in FIG. 7, the forward direction of the shield machine from the initial position to a plurality of locations spaced in the circumferential direction at locations opposite to the locations where each outer water stop member 38 faces the outer water stop member 22. An outer flapper 42 that prevents deformation of the outer water blocking member 22 in the opposite direction is disposed.
The outer flapper 42 is formed of a thin plate made of a material having rigidity such as metal.
The outer flapper 42 has a base 4202, a tip 4206 connected to the base 4202 via a hinge 4204, and a locking plate 4208 provided on the tip 4206.
The outer flapper 42 has a base 4202 attached to the inner peripheral portion of the annular plate portion 3606 together with the outer water blocking member 22 by bolts and nuts.
As shown in FIG. 8, the hinge 4204 is configured by inserting a shaft 4214 through a cylinder part 4210 formed in the base part 4202 and a cylinder part 4212 formed in the tip part 4206.
The locking plate 4208 extends from the front portion 4206 to the base portion 4202.
In the hinge 4204, the locking plate 4208 comes into contact with the base 4202, although the front 4206 swings in the forward direction of the shield machine from the first state where the front 4206 is located on the same plane as the base 4202. Thus, it is configured not to swing from the first state in the direction opposite to the advancing direction of the shield machine, whereby the outer water blocking member 22 is deformed from the initial position to the direction opposite to the advancing direction of the shield machine. Be blocked.

According to the present embodiment, since the entrance 10 includes the double water-stop members 20 and 22, it goes without saying that the shield machine can be excavated while preventing muddy water from entering the shaft 12. In addition, the following effects are achieved.
Since the outer water stop member 22 can be attached to and detached from the side surface 16A of the concrete wall 16, the shaft 12 is constructed with the minimum size by removing the outer water stop member 22, and the shaft 12 In the state where the entrance 10 is installed and the shield machine is carried into the shaft 12, a gap can be secured between the cutter at the tip of the shield machine and the side surface 16A of the concrete wall 16, and the worker goes back and forth through this gap. Thus, it is possible to perform work such as cutting work and removing work such as a steel sheet pile constituting the retaining wall from the inside of the start opening 18, which is advantageous in increasing the efficiency of work before starting the shield machine.

When these operations are completed, the outer ring hardware divided body 36 is attached to the side surface 16A of the concrete wall 16 via the inner ring hardware divided body 28, and each outer water blocking member divided body 38 is attached to the outer ring hardware divided body 36. Install. Alternatively, the outer water blocking member divided body 38 is attached in advance to the outer ring hardware divided body 36, and the outer ring hardware divided body 36 is attached to the annular plate 3606 of the inner ring hardware divided body 28. As a result, the water stop members 20 and 22 are double-equipped at the start opening 18.
In this case, since the outer water blocking member divided body 38 and the outer ring hardware divided body 36 are divided in the circumferential direction and reduced in size, the handling is convenient. Therefore, the cutter at the tip of the shield machine and the side surface 16A of the concrete wall 16 are provided. It is advantageous to increase the efficiency of the work of attaching the outer water blocking member divided body 38 and the outer ring hardware divided body 36 to the start opening 18 from the gap between the outer water blocking member divided body 38 and the outer ring water divided member 36.
Therefore, even when the vertical shaft 12 is constructed with the minimum necessary size that can minimize the thickness of the entrance 10 and can carry the shield machine in an urban area or the like, the double water-stop members 20 and 22 are used as the starting points. 18 can be equipped with tunnel excavation work.

It is sectional drawing of the entrance part installed in the shaft. It is a front view of an entrance. (A) is a front view of an outer ring hardware, and (B) is a side view thereof. (A) is explanatory drawing of the initial state of an outer side water stop member, (B) is explanatory drawing of the state which the outer side water stop member deform | transformed in the advancing direction of the shield machine. (A) is a top view of a hinge, (B) is the same front view. (A) is a front view of an outer ring hardware, and (B) is a side view thereof. (A) is explanatory drawing of the initial state of an inner side water stop member, (B) is explanatory drawing of the state which the inner side water stop member deform | transformed in the advancing direction of the shield machine. (A) is a top view of a hinge, (B) is the same front view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Entrance, 12 ... Standing pile, 14 ... Wall surface, 16 ... Concrete wall, 18 ... Starting port, 20 ... Inner water stop member, 22 ... Outer water stop member, 24 ... Outer ring hardware , 26 ... inner ring hardware, 32 ... inner flapper, 42 ... outer flapper.

Claims (4)

A shield machine having a concrete wall installed on the wall of the shaft and a start opening provided in the concrete wall, the start opening having an inner diameter larger than the outer diameter of the body of the shield machine. The entrance of
The outer peripheral surface of the trunk portion of the shield machine extends in the circumferential direction while projecting radially inward from the outer peripheral portion of the start port coaxially with the start port on the side surface of the concrete wall located opposite to the wall surface of the shaft An annular inner water stop member that can be elastically contacted is provided,
An annular outer water stop member elastically contactable with the outer peripheral surface of the trunk portion of the shield machine is provided coaxially with the inner water stop member in front of the end portion of the start port.
The outer water stop member is provided on an annular outer ring hardware attached to a side surface of the concrete wall,
The outer ring hardware is composed of a plurality of outer ring hardware divided bodies that are divided in the circumferential direction of the start opening and detachable from the side surface of the concrete wall,
The outer water stop member is composed of a plurality of arc-shaped outer water stop member divided bodies attached to the outer ring hardware divided bodies, respectively.
This is an entrance for starting a shield machine. Both the inner water stop member and the outer water stop member project inward in the radial direction of the start opening in a state where the inner water stop member and the outer water stop member are not in contact with the body of the shield machine, and the inner diameter thereof is larger than the outer diameter of the body of the shield machine. Arranged to be the initial position of small dimensions,
Deformation of the inner water stop member from the initial position to a direction opposite to the advancing direction of the shield machine at a plurality of locations spaced in the circumferential direction where the inner water stop member faces the outer water stop member An inner flapper is installed to prevent
The inner flapper is attached to the side of the concrete wall;
From the initial position to the direction opposite to the forward direction of the shield machine, a plurality of the outer water stop member divided bodies are spaced apart in the circumferential direction at locations opposite to the locations facing the outer water stop member. An outer flapper is disposed to prevent deformation of the outer water stop member;
The outer flapper is attached to the outer ring metal piece;
The entrance for starting a shield machine according to claim 1. An inner ring hardware is attached to the concrete wall,
The inner ring hardware includes a cylindrical plate portion that forms an inner peripheral surface of the start opening, and an annular plate portion that stands up from an end portion of the cylindrical plate portion and extends along an outer periphery of the end portion of the cylindrical plate portion. Prepared,
The inner water stop member and the inner flapper are attached to the concrete wall via the ring plate portion,
The entrance for starting a shield machine according to claim 1 or 2. The inner water stop member and the inner flapper are attached to the concrete wall via an inner peripheral portion of the ring plate portion,
The outer ring metal part is attached to the concrete wall via the outer periphery of the ring plate part,
The entrance for starting a shield machine according to claim 3.

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