JP2753750B2 - Split vertical shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a splittable vertical excavator.

<Conventional technology> As a method of constructing a shaft, there are a caisson method and a method of vertically propelling a shield machine.

However, in the conventional caisson method, a disadvantage that the friction and the penetration resistance of the surroundings increase as the cross section increases becomes inevitable.

Therefore, subsidence of the entire section required a lot of careful management and was uneconomical.

On the other hand, a problem when using the shield machine is that it cannot be diverted when the cross sections are different.

Therefore, in most cases, amortization is done once at the site.

<Object of the Present Invention> The present invention has been made in order to improve the conventional problems as described above, and has as its object to provide the following shield machine.

<a> Shield excavator that can excavate and construct a shaft with little resistance even in a shaft with a large cross section. <Means for Solving the Problems> That is, the present invention provides a supporting frame, a large number of steel sheet piles slidably mounted around the supporting frame, and a coupling mechanism for coupling adjacent steel sheet piles. And a step formed on the inner surface of the group of steel sheet piles,
A split vertical excavator, comprising a jack interposed between the step and the existing segment.

The present invention also provides a split vertical excavator in which the cross section of the steel sheet pile is formed in a trapezoidal shape in the above-described split type vertical shield excavator.

<Description of the Present Invention> Hereinafter, the present invention will be described in detail.

<A> Overall Configuration The shield machine according to the present invention includes a supporting frame 1, a steel sheet pile 2 slidably mounted around the supporting frame 1, and a jack 4 mounted on the supporting frame 1.

<B> Supporting frame The supporting frame 1 is a steel frame, and is formed in a shape similar to the shape of a shaft.

That is, if the shaft has a circular cross section, the supporting frame 1 is formed in a circular shape, and if the shaft is oval or rectangular, the supporting frame 1 is formed in a similar shape.

<C> Steel sheet pile A steel sheet pile 2 composed of a long and thin box is formed by combining steel sheets.

The cross section of the steel sheet pile 2 in the transverse direction is formed in a trapezoidal shape expanded outward.

That is, two groups of steel sheet piles are connected to the supporting frame 1.
When it is arranged on the outside, the dimension on the outside (the side in contact with the ground) is wider than the dimension on the inside (the supporting frame side). That is, it is formed in a trapezoidal cross section that spreads outward.

 The steel sheet pile 2 forms a step 21 in the middle of the inner surface.

The step 21 receives the reaction force of the jack 4.

<D> Sheet pile connecting mechanism A connecting mechanism 3 for connecting adjacent steel sheet piles 2 is provided.

The connection mechanism 3 has a structure in which a plurality of steel plates 2 are attached to the outer sides of the tail ends of the steel sheet piles 2 with a contact plate 31 having a length traversing the steel sheet piles 2, or a bolt hole is formed in a side surface of each steel sheet pile 2. It is possible to adopt a structure that is opened and a bolt is inserted into the bolt hole and fixed.

The plurality of steel sheet piles 2 are integrally connected by the connection mechanism 3.

<E> Jack When the group of steel sheet piles 2 is attached to the outer periphery of the supporting frame 1, a closed space such as a cylinder, a square cylinder, or an elliptic cylinder is formed.

Inside this closed space, a plurality of jacks 4 are arranged in parallel to the axial direction of the cylinder.

The jack 4 has a common receiving plate 41 attached before and after each of the plurality of jacks.

The receiving plate 41 has a shape obtained by dividing an annular plate body having a shape similar to the cross section of the shaft into a plurality of parts, and performs an action of transmitting the extension force of the jack 4.

That is, when set inside the excavator, the front receiving plate 41 transmits the force by hitting the step 21 of the steel sheet pile 2 and the rear receiving plate 41 hitting the segment.

<Operation of the Present Invention> Next, the operation of the device of the present invention will be described.

<A> Starting work A downward hole is excavated from the ground surface and reinforced with a guide wall w to prevent collapse around the hole.

The shield machine is positioned inside the guide wall W, and is lowered by applying a load.

After descending to some extent, assemble the segments inside. The upper end of this segment is fixed to the guide wall W to provide a reaction force.

The guide wall W takes a reaction force from underground using an earth anchor or the like.

<B> Sheet pile propulsion When excavating the shield machine, the steel sheet piles 2 are divided into a plurality of groups.

For this purpose, the adjacent steel sheet pile 2 is
Are connected to each other.

When the group of jacks 4 responsible for the group of sheet piles is extended, the extension force of the jack 4 acts between the step portion 21 of the steel sheet pile 2 and the segment, and the steel sheet pile 2 enters the ground due to the difference in weight. I do.

Since the group of steel sheet piles 2 is in a state in which the entire periphery of the shield machine is divided into a plurality of parts, the group can be made to penetrate the ground very easily as compared with the case where the entire cross section is settled at once.

<C> Recovery Especially in the case of shafts, the construction distance is short, and construction is completed in a short period of time.

Then, the supporting frame 1 is disassembled. However, the shield excavator body covering the periphery is a steel sheet pile 2 which can be divided, and thus the disassembly is extremely easy.

 Other parts are dismantled and transported to the ground.

<D> Diversion In the next construction, the cross-sectional shape and dimensions are rarely exactly the same.

However, since the steel sheet pile 2 of the present invention has a trapezoidal cross-sectional shape, if the supporting frame is changed, it can be easily adapted to other shapes only by attaching to the outer periphery thereof.

<E> Other methods of use Although the method of constructing a vertical shaft constructed substantially vertically has been described above, the shield machine according to the present invention can also be used in the construction of an inclined shaft as shown in FIG.

<Effects of the Present Invention> Since the present invention has the above-described configuration, the following effects can be achieved.

<B> Unlike a conventional caisson, it does not sink the whole unit.

The surrounding shell is divided into multiple parts. Therefore, even if the surrounding frictional resistance increases, it can be divided into small areas and pressed into the ground, and stable construction can be performed.

<B> The shell is divided into steel sheet piles.

Therefore, when the construction of the shaft is completed, it can be easily dismantled.

<C> The steel sheet pile constituting the shell has a trapezoidal cross section that expands outward.

Therefore, if only the supporting frame is changed, it can be used many times for the construction of shafts having different shapes and dimensions.

<D> It can be used not only for vertical shafts, but also for construction of inclined shafts that enter the ground diagonally.

[Brief description of the drawings]

 Fig. 1: Explanatory view of the use state of the device of the present invention Fig. 2: Longitudinal sectional view of the tip part Fig. 3: Cross sectional view of the device Fig. 4: Perspective view of steel sheet pile Fig. 5 : Explanatory drawing of another embodiment

Claims (2)

(57) [Claims] 1. A supporting frame, a plurality of steel sheet piles slidably mounted around the supporting frame, a coupling mechanism for coupling adjacent steel sheet piles, and a middle of an inner surface of the group of steel sheet piles. And a jack interposed between the step and the existing segment. 2. A split vertical excavator according to claim 1, wherein the cross section of the steel sheet pile is formed in a trapezoidal shape.