JP2732006B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for obstructing upper traffic, particularly when a large number of underground structures are excavated and constructed in a shallow position under the ground such as a railway or a road. The present invention relates to a method for constructing an underground structure that can be constructed without any problem.

[0002]

2. Description of the Related Art In order to dig deeply underground structures made of reinforced concrete in the underground such as railways and roads in the transverse direction, it is necessary to provide a protective work to support upper traffic. Providing a pipe roof for horizontally arranging steel pipes may be mentioned. However, in such conventional pipe roof protection works, construction work for this pipe roof protection work must be performed prior to tunnel excavation work and construction work for underground structures, and three types of pipe roof protection work must be performed. Since the construction is performed separately, the construction period and construction costs are large, and the labor and economic loss are large.

Further, since a steel pipe as a pipe roof is buried in the ground, thereby supporting a railway and an overburden, and constructing a tunnel serving as an underpass below the underlay, the overburden and the steel pipe are formed. In addition to the diameter of the tunnel, a work space is required to make the tunnel top between the tunnel top and the pipe roof, and the tunnel must be built deeper by these amounts.

On the other hand, the applicant has previously invented a method of constructing an underground structure as shown in FIG. 8, and has named this method a box-type roof construction method. According to this construction method, there is no need to construct protective work for underground structures excavated underground as a separate construction,
Since it is performed simultaneously with excavation of the underground structure, several types of construction can be performed at once, and moreover, safe, reliable, and inexpensive construction can be performed.

A steel sheet pile 2 is placed beside the upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4, and a press-fitting machine (not shown) is installed in the starting pit 3. Then, the box-shaped roof steel pipe 5 is pressed into the reaching shaft 4. The press-fitting machine has a pushing mechanism for jacking the steel pipe 5 for the roof and an internal digging mechanism for the steel pipe 5 using an auger or the like.

The roof steel pipe 5 is a box-shaped cylindrical body having a substantially square cross section, and has hook-shaped joints formed continuously on the left and right sides in the longitudinal direction, and a friction cutter plate 6 made of a flat steel plate is mounted on the upper surface. It is location. Such a steel pipe for roof 5
Press-fits unit cylinders one by one, but forms a boxed joint flange at the end and fastens the joint flanges with bolts and nuts to add one piece at a time in the length direction and bury the required length The friction cutter plate 6 is fixed at its tip to the tip of the roof steel pipe 5 by welding or the like. When sequentially connecting one by one, the friction cutter plate 6 is also connected and lengthened by the length of the roof steel pipe 5 by welding or the like.

The arrangement of the roof steel pipes 5 is in accordance with the outer circumference of the planned tunnel section, and the reaction wall 8,
A concrete box 9 as an underground structure is set, and a strut 14 and a primary pushing jack 10 are provided between the reaction wall 8 and the concrete box 9.
The cutting edge 11 is provided at the tip of the.

A small jack 12 for extruding the roof steel pipe 5 is provided between the front end of the concrete box 9 and the rear end of the roof steel pipe 5. The rear end of the friction cutter plate 6 is a stopper. At 13, it is fixed to the starting shaft 3, while a temporary receiving stand 15 is provided at the reaching shaft 4.

The concrete box 9 is excavated while releasing the fixing of the front end of the steel pipe 5 for roof and the front end of the friction cutter plate 6 while extending the propulsion jack 10 to take a reaction force on the reaction wall 8. At this time, the roof steel pipe 5 is pushed forward by the small jack 12 before the concrete box 9. At this time, the friction cutter plate 6 is left underground.

As described above, the roof steel pipe 5 and the concrete box 9 are advanced while the friction cutter plate 6 is left, so that the roof steel pipe 5 and the concrete box 9 advance in a state where the edge of the ground is cut off. ,
No frictional resistance due to earth pressure. In order to make the concrete box 9 excavate, the front part of the cutting edge 11 is excavated. However, this work is protected by the steel pipe 5 for the roof, and the work can be performed safely without the risk of earth and sand collapse. The front end of the steel pipe for roof 5 that has come out to the reaching pit 4 is removed by bolts and nuts and removed one by one while being received by the temporary receiving table 15.

Regarding the method of propelling the concrete box 9, a reaction force receiving member and a center hole type towing jack are provided on the reaching shaft 4 side, and one end of the concrete box 9 is fixed to the underground structure by a fixing tool. By pulling a towing member made of C steel wire with this towing jack, the underground structure 9 can be drawn from the reaching pit 4 side. Further, the roof steel pipe 5 can be directly pushed by the front end of the concrete box 9 without providing the small jack 12.

[0012]

Since the friction cutter plate 6 has such a structure, the roof steel pipe 5 and the concrete box 9 advance with the edge cut off from the ground, and receive frictional resistance due to earth pressure. Although the rear end is fixed to the starting pit 3 side by the stop member 13 when the rear end is pulled together with the concrete box 9, the stop member 13 is loosened or the friction cutter plate 6 itself is slightly The ground may be extended one by one and the ground above may move from the friction cutter plate 6 accordingly.

An object of the present invention is to provide a method of constructing an underground structure which solves the above-mentioned disadvantages of the prior art and corrects co-pulling of a friction cutter plate with a concrete box so as not to adversely affect the upper ground. Is to do.

[0014]

According to the present invention, in order to achieve the above-mentioned object, a steel pipe for a roof having a box-shaped cross section having a friction cutter plate disposed on an upper surface thereof is arranged side by side, and the underground is moved from a starting pit side to a destination pit side. In the method of constructing an underground structure in which a roof steel pipe and a concrete box for an underground structure behind it are sequentially propelled while the friction cutter plate is left underground, a jack is provided behind the rearmost concrete box. A push-back device is provided, and the push-back device is connected to the rear end of the friction cutter plate to pull back the friction cutter plate co-pulled with the propulsion of the concrete box, and
The gist of the invention is to provide a fixing device at the rear end of the friction cutter plate and connect the fixing device and a jack as a push-back device via a tie rod.

[0015]

According to the first aspect of the present invention, when the roof steel pipe and the concrete box for the underground structure behind the roof steel pipe are sequentially propelled while the friction cutter plate is left in the ground, the friction cutter plate becomes Although it is co-pulled by the box, the part that moves forward due to the co-pulling and the like is pulled back at the rear end by the return device and corrected, so that there is no adverse effect on the upper ground.

According to the second aspect of the present invention, in addition to the above-described operation, the return device by the jack and the friction cutter plate can be reliably connected with a distance therebetween, and only the rear end of the friction cutter plate is pulled. Ample clearance can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are longitudinal sectional side views showing one embodiment of the method of constructing an underground structure according to the present invention. The main part of the construction method is the same as the conventional one described in FIG. The roof steel pipes 5 each having a box-shaped section are arranged in parallel and pressed into the ground from the starting pit 3 to the destination pit 4. The roof steel pipes 5 and the rear of the roof steel pipes 5 are left while the friction cutter plate 6 is left underground. This is a method of constructing an underground structure in which concrete boxes 9 for an underground structure are sequentially propelled, and a detailed description thereof is omitted because it is the same as that of the conventional example.

According to the present invention, a return device by a jack 16 is provided behind the rearmost concrete box 9, and a fixing device 17 is provided at the rear end of the friction cutter plate 6. The fixing device 17 and the jack 16 are connected to a PC. They were connected via tie rods 18 made of steel bars.

The jack 16 is placed on a mount 19 abutting on the rear end of the concrete box 9 at the rear of the starting pit 3 and is positioned on the upper surface of the rearmost concrete box 9. The fixed horizontal members 20 are arranged at appropriate intervals along the reaction force receiving members, and the movable girder members 21 are attached to the rods of the jack 16.
Install.

On the other hand, at the rear end of the friction cutter plate 6, a girder 22 for connecting a plurality of friction cutter plates 6 at a time is arranged, and the girder 22 and the movable girder 21 are connected by a tie rod 18. . The tie rod 18 is connected to the girder member 22 and the movable girder member 21 by a fixing tool 17 and a fixing tool 23 formed by a combination of a stiffener, a support plate, and a nut, and the fixing tool 17 and the fixing tool 23 are loosely tightened. The joint can be easily adjusted. The tie rods 18 are connected to unit pieces by a coupler 24 and have an appropriate length.

The connecting method of the return device by the jack 16 and the rear end of the friction cutter plate 6 is shown in FIGS.
The invention is not limited to the one shown in FIG. 8. For example, a center hole type jack or a screw type jack is used for the jack 16, or a string member such as a wire or a PC steel wire is used instead of the tie rod 18. Or doing something.

In this way, the steel pipe for roof 5 and the concrete box 9 are advanced while the friction cutter plate 6 is left. When the friction cutter plate 6 is pulled together with the concrete box 9, it is not pulled. Extends the jack 16, thereby pushing the movable girder 21 backward.

As a result, the friction cutter plate 6 is pulled by the tie rod 18 and the girder member 22 in the direction opposite to the direction in which the friction cutter plate 6 is co-pulled, and is automatically returned by the amount of movement.

The amount of retraction can be determined by attaching a sensor to a portion of the fixing tool 17, measuring the sensor, and operating the jack 16 by that amount to automatically retreat. When the jack 16 is a hydraulic jack, the amount of retraction is controlled (by an electric resistor) by adjusting the amount of oil discharged from a hydraulic pump that operates the hydraulic jack.

[0025]

As described above, according to the method of constructing an underground structure of the present invention, a box-shaped roof steel pipe having a friction cutter plate disposed on an upper surface thereof is arranged in parallel to move from a start pit side to a destination pit side. In a method of constructing an underground structure in which a roof steel pipe and a concrete box for an underground structure therebelow are sequentially propelled while being pressed into the ground and the friction cutter plate is left underground, the friction cutter plate includes a concrete box. Can be corrected so as not to adversely affect the upper ground.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view before adjustment showing an embodiment of a method for constructing an underground structure according to the present invention.

FIG. 2 is a vertical sectional side view showing an adjusted underground structure according to an embodiment of the present invention.

FIG. 3 is a side view of a main part showing one embodiment of the method of constructing an underground structure according to the present invention.

FIG. 4 is a plan view of a main part showing one embodiment of the method for constructing an underground structure according to the present invention.

FIG. 5 is an overall plan view showing one embodiment of a method for constructing an underground structure according to the present invention.

FIG. 6 is an overall side view showing one embodiment of the method for constructing an underground structure according to the present invention.

FIG. 7 is a front view of a tie rod to be used.

FIG. 8 is an explanatory diagram of a conventional method of constructing an underground structure without using the present invention.

[Explanation of symbols]

 1 top traffic 2 earth pile pile 3 start shaft 4 reaching shaft 5 steel pipe for roof 6 friction friction plate 8 reaction wall 9 concrete box 10 main pushing jack 11 cutting edge 12 small Jack 13 ... Stopping member 14 ... Strut 15 ... Temporary support 16 ... Jack 17 ... Fixing tool 18 ... Tie rod 19 ... Ground 20 ... Fixed horizontal member 21 ... Movable girder 22 ... Girder 23 ... Fixer 24 ... Coupler

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-80685 (JP, A) JP-A-1-3222094 (JP, A) JP-A-3-32686 (JP, U)

Claims (2)

(57) [Claims] 1. A box-shaped roof steel pipe having a friction cutter plate disposed on an upper surface thereof is arranged side by side and pressed into the ground from the start pit side to the destination pit side, while leaving the friction cutter plate in the ground. In a method for constructing an underground structure in which a roof steel pipe and a concrete box for an underground structure behind the roof are sequentially propelled, a return device using a jack is provided at the rear of the rearmost concrete box, and this return device is provided after the friction cutter plate. Connect to the end,
A method for constructing an underground structure, wherein a friction cutter plate drawn together with a concrete box is pulled back as the concrete box is propelled. 2. The method according to claim 1, wherein a fixing device is provided at a rear end of the friction cutter plate, and the fixing device is connected to a jack as a return device via a tie rod.