JP2004143834A - Settlement preventing apparatus and settlement preventing method for cylindrical body for roof in construction method for underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability by preventing cylindrical bodies for a roof jacked preceding an underground structure, from sagging downward at a working face part or the like caused by earth pressure or the like from above. <P>SOLUTION: In a construction method for the underground structure, the cylindrical bodies 6 for the roof with friction cutters 7 disposed at the upper parts are pressed into the ground from a start pit 3 and juxtaposed, and the underground structure 9 is disposed at the rear parts of the cylindrical bodies 6 for the roof left in the start pit 3, and advanced boring while leaving the friction cutters 7. In this case, lifting cables 17a, 17b for lifting the downward sagging part of the cylindrical body 6 for the roof are passed through inside the cylindrical body 6 over the lengthwise direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing an underground structure that can be constructed without impeding upper traffic when excavating and constructing an underground structure with a large number of members in the underground of a railway, a road, etc. The present invention relates to a tubular body for a roof.
[0002]
[Prior art]
In order to dig deep underground structures such as railways and roads in the lower ground in the transverse direction, it is necessary to provide protective work to support the upper traffic. Although there is a need to provide a roof, there is no need to construct underground structures to be excavated underground as separate work, and it is performed simultaneously with excavation of underground structures, so construction can be done safely, reliably, and inexpensively. The following construction methods are known as those which can be constructed with a shallow earth covering.
[0003]
As shown in FIG. 4, first, an earth retaining steel sheet pile 2 is placed beside an upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4, and a press-fitting machine is inserted into the starting pit 3. 5, and the roof cylinder 6 is press-fitted toward the reaching shaft 4.
[0004]
The roof cylindrical body 6 is a cylindrical pipe roof or a box-shaped cylindrical body having a substantially square cross section made of a long and integral steel pipe, and is formed continuously in the longitudinal direction via a hook-shaped joint on the side. A friction cutter 7 made of a single flat plate is provided on the upper surface, and is arranged side by side through a joint. This arrangement is selected as appropriate, for example, according to the one-letter type, as shown in FIG.
[0005]
Next, as shown in FIG. 5, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the starting pit 3, and a propulsion jack 10 of a main push is provided between the reaction wall 8 and the underground structure 9. Is provided at the tip of the underground structure 9, and a small jack 12 is interposed between the tip of the underground structure 9 and the roof cylinder 6.
[0006]
In the figure, 13 is a support member for the roof cylinder 6, 14 is a stopper for the friction cutter 7, which is provided on the starting pit 3 side, while a receiving stand 15 is provided on the reaching pit 4 side.
[0007]
The small jack 12 is extended to push the roof cylinders 6 one by one while leaving the friction cutter 7 with the underground structure 9 as a reaction force. The propulsion jack 10 is extended and the underground structure 9 is excavated. In the figure, reference numeral 16 denotes a strut interposed between the propulsion jack 10 and the underground structure 9 (see FIG. 6).
[0008]
In this way, the roof cylinder 6 that has come out to the destination pit 4 is sequentially removed while the advance of the roof cylinder 6 and the advance of the underground structure 9 are alternately repeated.
[0009]
Then, when the tip of the underground structure 9 reaches the reaching pit 4, the cutting edge 11 and the like are removed, and backfill grout is performed as appropriate to complete the construction.
[0010]
In addition, the underground structure 9 may be configured such that a precast concrete box is sequentially suspended and connected in the starting pit 3 or concrete is poured in the starting pit 3 to increase the required length. You may do so.
[0011]
Regarding the method of advancing the underground structure 9, a reaction wall and a center-hole type traction jack are provided on the reaching shaft 4 side, and a traction member made of a PC steel wire having one end fixed to the underground structure 9 is pulled by the traction jack. There is also a construction method in which the underground structure 9 is drawn in from the reaching shaft 4 side.
[0012]
[Problems to be solved by the invention]
In such a method of constructing an underground structure, as shown in FIG. 8, the roof cylinder often sags downward particularly at the face due to earth pressure from above. For this reason, the bent portion hinders the excavation of the underground structure, and the construction becomes difficult.
[0013]
An object of the present invention is to solve the inconvenience of the conventional example, to prevent the roof cylinder from sagging downward, and to prevent settlement of the roof cylinder in a method of constructing an underground structure capable of improving workability. An apparatus and a method for preventing settlement are provided.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides, as a device for preventing settlement of a roof cylinder, first, a roof cylinder in which a friction cut member is disposed at an upper portion is pressed into the ground from a starting pit and is arranged in parallel. A method of constructing an underground structure in which an underground structure is disposed at a rear portion of a roof cylinder remaining in a starting pit, and the underground structure is excavated while a friction cut member is left underground. In this case, a pulling rope for pulling up a slack portion of the roof cylindrical body downward in the longitudinal direction is penetrated.
[0015]
Second, the ropes are arranged in a wavy manner in the roof cylinder, thirdly, the plurality of ropes are arranged so as to intersect vertically, and fourth, the ropes are the roof cylinders. Fifthly, the rope is attached to the inner wall of the roof body so as to be movable in the horizontal direction at the vertical position on the inner wall of the roof cylinder. Sixth, the guide member is constituted by a roller.
[0016]
Seventh, as a method of preventing the settlement of the roof cylinder, seventh, a roof cylinder having a friction cut member disposed on the upper part is pressed into the ground from the start pit to be parallel, and the rear part of the roof cylinder remaining in the start pit A method of constructing an underground structure in which an underground structure is disposed in the ground and the underground structure is excavated while the friction cut member is left in the ground, wherein the roof cylinder is disposed inside the roof cylinder over a length direction. The gist of the present invention is to penetrate a pulling rope for raising a downward slack portion, and to pull the rope in a horizontal direction to lift a downward slack portion of the roof cylinder.
[0017]
According to the first and seventh aspects of the present invention, the rope that has penetrated the length of the roof tube in the longitudinal direction is pulled in the horizontal direction, so that the rope acts on the rope in the vertical direction. Is transmitted to the roof cylinder, the downward slack portion of the roof cylinder is lifted, and the slack is eliminated.
[0018]
According to the second aspect of the present invention, when the rope is pulled up and down by arranging the rope vertically in the roof cylinder, a downward component of the waveform has an upward component force when the rope is pulled. As a result, a downward component force is generated in the upward convex portion, and the slack portion of the roof cylinder is pulled up by the resultant force of the vertical component force.
[0019]
According to the third aspect of the present invention, in addition to the above-described operation, by arranging a plurality of wires so as to intersect vertically, a space between portions at which a resultant force of a vertical component is obtained is reduced. Therefore, a large lifting force can be obtained as a whole.
[0020]
According to the fourth aspect of the present invention, in addition to the above-described operation, the rope is hung on the guide member fixed to the inner wall of the roof cylinder at appropriate intervals at the up and down positions. Even if bending occurs at a location, it can be dealt with immediately by pulling the cable.
[0021]
According to the fifth aspect of the present invention, the cable is hung on the guide member which is disposed on the inner wall of the roof cylinder so as to be movable in the vertical direction at a vertical position. Can be moved and arranged, and the deflection can be reliably and efficiently eliminated.
[0022]
According to the sixth aspect of the present invention, in addition to the above-mentioned operation, the guide member is constituted by a roller, so that even if the rope pulled through the roller rubs against the roller, the guide member may be cut. Absent.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view showing an embodiment of an apparatus for preventing settlement of a roof cylinder and a method for preventing settlement in a method of constructing an underground structure according to the present invention, and FIG. 2 is a longitudinal sectional side view of a roof cylinder which is a main part of the same. Since the method of constructing an underground structure in which the present invention is implemented is the same as that described with reference to FIGS. 4 to 6, the detailed description is omitted here, and FIGS. 4 to 6 and FIG. The same components as those of the conventional example described above are denoted by the same reference numerals.
[0024]
Also in the present invention, the roof cylinder 6 is advanced before the underground structure 9 is propelled. Inside the roof cylinder 6, a plurality of, in the illustrated example, two cables 17a, 17b are arranged in a waveform in a longitudinal direction. In this case, the ropes 17a and 17b are arranged so that the convex portions of the waveform face each other at the vertical position.
[0025]
Further, as shown in FIG. 2, it is desirable that the pitch of the upward and downward convex portions of the waveform is small so that the inclination angle with the adjacent convex portion is large.
[0026]
In the first embodiment, a roller 18 which is a guide member disposed at the pitch of the convex portion is fixed to the inner wall of the roof cylinder 6 at the convex portion, and the ropes 17a and 17b can be slid on the roller 18. Hang on. One ends of the cords 17 a and 17 b are fixed to the end of the roof cylinder 6.
[0027]
In the step of propelling the underground structure 9 as described above, if the roof cylinder 6 partially bends downward, the ends of the ropes 17a and 17b on the opposite side to the fixing side are moved in the horizontal direction. To pull. As a result, a force for straightening in the horizontal direction acts on the ropes 17a and 17b, and a component force in the upper vertical direction via the roller 18 is applied to the convex portion below the waveform, and A downward component force acts on the convex portion via the roller 18, and these upper and lower component forces become a resultant force to lift up the slack portion of the roof cylinder 6.
[0028]
In this case, the vertical component force can be increased by reducing the interval between the convex portions of the waveform and increasing the inclination angle with the adjacent convex portion.
[0029]
In addition, a plurality of cords, two in the illustrated example, are used and arranged so that the waveforms intersect alternately, thereby further reducing the interval between the convex portions of the waveform and inclining with the adjacent convex portion. Corners can be made larger.
[0030]
When the ropes 17a, 17b are pulled in the horizontal direction, friction occurs between the ropes 17a, 17b and the rollers 18, but the ropes 17a, 17b move smoothly along the rollers 18, so that the ropes 17a, 17b move smoothly. There is no possibility that the rollers 17a and 17b are cut by the roller 18.
[0031]
FIG. 3 shows a second embodiment of the anti-sinking device. In the first embodiment, the roller 18 as a guide member is fixed to the inner wall of the roof cylinder 6, but in the second embodiment, the inner wall is movable. It was arranged. As a moving means, a tension member such as a cable 19 is attached to the roller 18 and the roller 18 is moved by being pulled.
[0032]
In this case, when the roof cylinder 6 is bent, the roller 18 can be moved to the bending location by pulling the cable 19 horizontally in the length direction of the roof cylinder 6, so that the roller 18 can be reliably moved. The deflection can be efficiently eliminated. Further, the roller 18 can be moved to the face where the bending is particularly likely to occur, and can be always arranged at this position, so that the bending can be efficiently eliminated.
[0033]
【The invention's effect】
As described above, the apparatus for preventing settlement of a roof cylinder in the method of constructing an underground structure and the method for preventing settlement of the underground structure according to the present invention are described below. For this reason, it is possible to prevent the work from sagging downward at the face, for example, and to improve workability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view showing an embodiment of an apparatus for preventing settlement of a roof cylinder and a method for preventing settlement in a method of constructing an underground structure according to the present invention.
FIG. 2 is a longitudinal sectional side view of a roof cylinder, which is a main part, showing a first embodiment of a settlement apparatus and a settlement prevention method for a roof cylinder in a method of constructing an underground structure according to the present invention.
FIG. 3 is a vertical sectional side view of a roof cylinder, which is a main part, showing a second embodiment of a settlement apparatus and a settlement method for a roof cylinder in a method of constructing an underground structure according to the present invention.
FIG. 4 is a vertical sectional side view of a first step of the method for constructing an underground structure.
FIG. 5 is a vertical sectional side view of a second step of the method for constructing an underground structure.
FIG. 6 is a vertical sectional side view of a third step of the method for constructing an underground structure.
FIG. 7 is a front view showing an example of an arrangement state of cylinders.
FIG. 8 is a vertical sectional side view showing a conventional method of constructing an underground structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Upper traffic 2 ... Earth retaining sheet pile 3 ... Starting pit 4 ... Reaching pit 5 ... Press-fitting machine 6 ... Roof cylinder 6a, 6b ... 6n ... Split body 7 ... Friction cutter 8 ... Reaction wall 9 ... Underground structure DESCRIPTION OF SYMBOLS 10 ... Propulsion jack 11 ... Blade opening 12 ... Small jack 13 ... Support member 14 ... Stop member 15 ... Cradle 16 ... Strut 17a, 17b ... Cable 18 ... Roller 19 ... Cable

Claims (7)

A roof cylinder with a friction cut member arranged at the top is pressed into the ground from the starting pit and paralleled, and an underground structure is arranged behind the roof cylinder remaining in the start pit, and the friction cut member is grounded. In a method of constructing an underground structure in which an underground structure is excavated while being left inside, a pulling rope for pulling up a sagging portion of the roof cylinder downward over the length direction is provided inside the roof cylinder. An apparatus for preventing settlement of a roof cylinder in a method of constructing an underground structure, characterized by being penetrated. 2. The apparatus for preventing settlement of a roof cylinder in the method of constructing an underground structure according to claim 1, wherein the cords are arranged in a wavy manner in the roof cylinder. The apparatus for preventing settlement of a roof cylinder in the method of constructing an underground structure according to claim 1 or 2, wherein a plurality of cables are arranged so as to intersect vertically. 4. The roof tubular body according to any one of claims 1 to 3, wherein the rope is hung on a guide member fixed to the inner wall of the roof tubular body at an up-down position at appropriate intervals. Anti-sinking device. The roof according to any one of claims 1 to 3, wherein the cable is hung on a guide member disposed on the inner wall of the roof cylinder so as to be movable in a vertical direction at a vertical position. Settling prevention device for cylinders. 6. The apparatus according to claim 4, wherein the guide member comprises a roller. A roof cylinder with a friction cut member arranged at the top is pressed into the ground from the starting pit and paralleled, and an underground structure is arranged behind the roof cylinder remaining in the start pit, and the friction cut member is grounded. In a method of constructing an underground structure in which an underground structure is excavated while being left inside, a pulling rope for pulling up a sagging portion of the roof cylinder downward over the length direction is provided inside the roof cylinder. A method for preventing sinking of a roof cylinder in a method of constructing an underground structure, characterized in that a downward slack portion of the roof cylinder is pulled up by penetrating and pulling the cable in a horizontal direction.

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