JPH08121077A - Construction method of start and arrival shaft - Google Patents

Abstract

PURPOSE: To work for a safe, and what is more, economical start or arrival of an excavating machine by burying a shaft main body underground and executing start and arrival of a shield machine by the application of a double plate member which comprises a removable plate into the wall surface of the shaft and an easily destructive plate. CONSTITUTION: The inside of a steel-made segment frame 1, which is constructed based on an open caisson method and assembled on a ground area, is excavated and the wall surface is buried undersround. Further, a similar frame 1 is further constructed on the top of the frame 1 and buried one after another. More specifically, a shield machine 2 and a semi-shield machine or the like are arranged to arrive at the side surface of a shaft under construction. Only the side surface which can be joined from outside, is formed with a double plate member. The propulsion of the machine is temporarily halted when the tip of the shield machine comes in contact with the outside surface of an exterior destructive plate 4. Then, a worker enters the shaft and removes an interior removable plate and then the operation of the machine 2 is started once again, thereby cutting off the exterior destructive plate 4, such as a thin concrete board with the blade of the machine 2. Then, the machine 2 advances into the shaft while the other tunnel advances from the side and is connected to the shaft, thereby ending an arrival work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shaft for a shield machine to reach from the outside or a shaft for starting from the inside.

[0002]

2. Description of the Related Art A reaching shaft is a shaft previously constructed at the arrival position of a tunnel such as a shield machine. When the excavator reaches the outside of the shaft constructed in this way, a part of the shaft must be destroyed and introduced inside. The start shaft is a shaft for starting the shield machine from the inside toward the ground, and at the time of starting, the same is done by destroying a part of the shaft.

[0003]

[Problems to be Solved by the Invention] In the above-mentioned conventional method for constructing a starting shaft and a reaching shaft, if a part of the shaft is destroyed and opened, the earth and sand flow into the shaft at one time. There was a problem that there was a high risk of coming. The reason is that the groundwater level around the shaft is generally higher than the planned opening. Therefore, even if the surrounding ground was improved, the opening work had to be performed very carefully.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is a safe and economical method for accepting or starting the arrival of an excavator or for launching a vertical shaft. The purpose is to provide a construction method.

[0005]

In order to achieve the above-mentioned object, the starting and reaching shaft construction method of the present invention comprises:
When constructing a shaft for shield shield machine to reach from the side, the shaft body constructed on the ground is submerged in the ground due to the internal excavation, and the wall of the shaft where the tip of the shaft hits the shaft. Characterized by a method for constructing a starting and reaching shaft, in which only the inner member of the double plate member can be removed and the outer member is easily broken Is.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for constructing a starting and reaching shaft according to the present invention will be described below with reference to the drawings.

<B> Overall Structure The shaft of the present invention is constructed by the open caisson method. In this construction method, steel segments are assembled on the ground to construct a steel segment frame body 1 having a constant height. Then, the inside of the steel segment frame 1 is excavated to sink the wall surface into the ground, and the steel segment frame 1 is similarly constructed on the upper part of the wall to sequentially sink the wall. The frame 1 is formed in a circular shape or an oval shape.

<B> Reaching Position Although the method of the present invention can be applied to a starting shaft, the reaching shaft will be described for the sake of simplicity. The shield machine 2, semi-shield machine 2, etc. are made to reach the side surface of the shaft constructed as described above. Therefore, after the construction of the shaft is completed, the position where the excavator 2 reaches and the tip of the excavator 2 collides, the depth, the direction, the diameter of the excavator 2 to be reached, etc. are all known in advance. .

<C> Double structure of reaching portion Therefore, only the wall surface at the position where the excavator 2 reaches and is joined from the outside is composed of a double plate member, that is, the inner removal plate 3 and the outer destruction plate 4. It is composed of part A. Inner removal plate 3
For example, a steel segment can be used, and as the outer breaking plate 4, for example, a concrete thin plate can be used.

The segment is a divided plate body, and the steel segment is formed by welding a reinforcing partition plate around and inside a thin steel plate. In the synthetic portion A, the steel segment on the inner side and the thin plate made of concrete on the outer side are not integrally joined, but combined by bolts or the like so that they can be easily separated.

However, the composite section A is not limited to the combination of the steel segment and the concrete segment. In short, the inner removal plate 3 may be a member that can be easily removed, and the outer destruction plate 4 may be a member that can be easily destroyed from the inside or the outside. The synthetic resin plate or other known materials may be used to form the plate material. You can The inner removal plate is constructed so as to be easily disassembled and separated from the surrounding frame 1 by bolts or the like.

<D> Removal of Inner Removal Plate 3 The shield machine 2 or the like which has been excavating in the outside reaches the vertical pit thus constructed. Then, the excavation is temporarily stopped while the tip of the excavator 2 is in contact with the outer surface of the outer destruction plate 4. Next, a worker enters the shaft and pulls the inner removal plate 3 inward by a work such as removing the surrounding bolts and the bolt with the outer destruction plate 4 to remove the inner removal plate 3.

Then, only a thin outer destructive plate 4 made of concrete or the like remains on the outer side, and it is necessary to withstand the surrounding earth pressure and water pressure only by this thin plate. However, the machine 2 is in close contact with the outer surface of the thin outer destructive plate 4.
Therefore, all of earth pressure and water pressure do not directly act on the thin outer destructive plate 4, and it is possible to endure it safely. Before and after the machine reaches the vertical shaft, the surrounding ground may be improved and chemicals may be injected to protect it more safely.

<E> Destruction of the outer fracture plate 4 After the inner removal plate 3 such as a steel segment is removed, the operation of the machine 2 is restarted. Then, the outer breaking plate 4 such as a concrete plate having a thin blade of the excavator 2 can be cut or broken to enter the shaft. In this way, another tunnel enters the shaft from the side and is connected, and the work to reach is completed.

<F> In case of the starting shaft The above description is for the reaching shaft, but also when the shield machine 2 is started from inside the shaft, the inner removal plate 3 is similarly provided.
After removing, the outer breaking plate 4 such as a thin concrete plate can be cut off with the blade of the excavator 2 and started toward the ground outside the shaft.

[0016]

Since the method for constructing the starting and reaching shaft according to the present invention is as described above, the following effects can be obtained.

<A> After the excavator 2 or the like reaches the outside of the shaft, the inside removing plate 3 can be removed. Therefore, the excavator 2 can cut and destroy only the thin plate body to enter the shaft, and the arrival work can be completed very easily.

<B> Conventionally, there has been a problem that since a part of the shaft is destroyed and opened, there is a high risk that earth and sand will flow into the shaft at once. Therefore, even if the surrounding ground was improved, the opening work had to be done very carefully. However, in the method of the present invention, since the shield machine itself cuts the thin rupture plate and enters while destroying it, it is not necessary to destroy a part of the shaft in advance to prevent the inflow of sediment. You can

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a method of using a starting and reaching shaft according to the present invention.

FIG. 2 is an explanatory view of an embodiment of a method for constructing a vertical shaft.

FIG. 3 is an explanatory view of an example of a reaching portion of a vertical shaft.

Claims (4)

[Claims] 1. When constructing a shaft for a shield machine to start and reach, the shaft body constructed in the ground portion is sunk into the ground due to internal excavation, and the position where the shaft abuts. The wall of the shaft of the vertical shaft is composed of double plate-shaped members, the inner plate of the double plate-shaped members can be removed freely, and the outer plate-shaped member can be destroyed. How to construct a mine 2. The method for constructing a starting shaft and reaching shaft according to claim 1, wherein the removable inner plate is made of a steel segment and the outer destructible plate is made of a concrete thin plate segment. 3. A method for constructing a shaft for starting and reaching shafts, wherein the shaft shaft body is composed of steel segments, and only the starting and reaching parts are composed of a combination of steel segments and concrete segments. 4. The shaft main body is composed of steel segments, only the starting and reaching parts are composed of a combination of steel segments and concrete segments, and the segments are joined by bolts so that they can be dismantled freely. How to build a reach shaft