JPH0574677B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to urban areas for water supply and sewage, public drainage, telegraph,
Concerning the open shield construction method for constructing underground structures such as underground passages for laying telephones, etc.

[Conventional technology]

The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.

The outline is shown in Fig. 6. In the figure, 1 is an open shield machine, which is a U-shaped shield machine with openings on the front, rear, and top surfaces, consisting of left and right side wall plates 1a and a bottom plate 1b connecting them. . The open shield machine 1 has the tips of the side wall 1a and the bottom plate 1b formed as a cutting edge having a triangular box shape in cross section, and the side wall plate 1.
Propulsion jacks 3 are arranged vertically and facing rearward at the center or near the rear end of a.

7 in the figure is a pressure receiving member provided at the rear end of the propulsion jack 3, which is made of box steel or shaped steel.

This shield machine 1 is installed in the starting shaft 6, and earth and sand in front of the starting shaft 6 is excavated and discharged from the front or top opening of the shield machine 1. Then, the propulsion jack 3 of the shield machine 1 is extended to apply a reaction force to the reaction wall in the launch shaft 6 to move the shield machine 1 forward, moving the first underground structure 4 made of a concrete box or the like upward. It is suspended from the shield machine 1 and set behind the propulsion jack 3 which is retracted within the tail portion 1c of the shield machine 1.

Next, earth and sand are similarly excavated and discharged from the front or upper surface of the shield machine 1, and the shield machine 1 is moved forward, and a second underground structure 4 is placed in front of the first underground structure 4. The tail part 1c of the shield machine 1
hang it inside. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied on the rear underground structures 4, and open shielding is performed. Machine 1 reached Pit 1
Once it reaches 1, remove it and complete the construction.

[Problem to be solved by the invention]

In the conventional open shield construction method as described above, the reaching hole 11 is required for recovering the shield machine 1.

However, constructing the reaching shaft 11 using a vertical shaft requires relatively large-scale construction work, such as driving piles for retaining the earth. In addition, in some cases, such as when the ground is soft, it may not be possible to drive piles, in which case additional work such as ground improvement will be required, making it even more troublesome.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
An object of the present invention is to provide an open shield construction method that allows an open shield machine to be recovered to the ground without a reaching hole, and that can reduce the process and construction costs and shorten the construction period.

[Means to solve the problem]

In order to achieve the above object, the present invention installs an open shield machine, which is a U-shaped shield machine, which is a U-shaped shield machine with openings on the front, rear, and top surfaces, which is made up of left and right side wall plates, a beam member connecting them, and a bottom plate. Excavate and discharge earth and sand from the front or top of the machine, move the shield machine forward, and lower the new underground structure into the tail of the shield machine in front of the existing underground structure. By repeating the process of digging and setting up the underground structures, the underground structures were buried in columns in sequence, and backfilling was performed on the underground structures in the rear, until the open shield machine reached its destination. Therefore, in the open shield construction method where this is removed and the construction is completed, once the open shield machine has reached the destination, the bottom plate, propulsion jack, and column-shaped pressure receiving member using box steel or shaped steel are removed from the shield machine. was removed and the left and right side wall plates were connected with beam members etc. to create an opening at the bottom without a bottom plate, and while backfilling the inside of this open shield machine in stages, the space between the top surface of the backfill and the open shield machine was created. The main idea is to use a lifting jack to interpose a lifting jack, and as the backfill rises, the open shield aircraft is pushed up until it reaches the ground level.

[Effect]

According to the present invention, at the destination, the open shield aircraft can be recovered without a landing shaft by pushing it up to the ground using a lifting jack.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 4 are front views of each process during recovery of an open shield machine, showing one embodiment of the open shield construction method of the present invention.

Regarding the process to reach this destination,
As shown in FIG. 5, it is almost the same as the conventional example explained in FIG. 6 above.

That is, an open shield machine 1, which is a U-shaped shield machine with open front, rear, and top surfaces, is installed in the starting shaft 6, and consists of left and right side wall plates 1a, a beam member 8 connecting them, and a bottom plate 1b. Earth and sand in front of the starting shaft 6 is excavated and discharged from the front or top opening of the shield machine 1. Then, the propulsion jack 3 of the shield machine 1 is extended to apply a reaction force to the reaction wall in the launch shaft 6 to move the shield machine 1 forward, and the first underground structure 4 made of a concrete box or the like is moved forward.
is suspended from above and attached to the tail part 1 of the shield machine 1.
Set it behind the propulsion jack 3 that has been retracted within c.

Next, earth and sand are similarly excavated and discharged from the front or upper surface of the shield machine 1, and the shield machine 1 is moved forward, and a second underground structure 4 is placed in front of the first underground structure 4. The tail part 1c of the shield machine 1
hang it inside. Thereafter, similar steps of digging and setting the underground structures 4 are repeated to sequentially bury the underground structures 4 in columns in the ground, and backfill 5 on the underground structures 4 at the rear.

In this way, when the open shield machine 1 reaches its destination, remove the bottom plate 1b, propulsion jack 3, column-shaped pressure receiving member 7 made of box steel or shaped steel, etc. from the shield machine 1, and It is assumed that the side wall plates 1a, 1a are simply connected to each other by a beam member 8, and the bottom is open without a bottom plate.

As shown in FIG. 1, a jack receiving part 9 is attached to the lower inner side of the left and right side wall plates 1a, 1a of the open shield machine 1, and a jack receiving part 9 is installed between the jack receiving part 9 and the ground on the bottom of the shield machine 1. Jyatsuki 10
If this is extended, the open shield machine 1 will be pushed up by the stroke as shown in FIG.

Next, the lifting jack 10 is retracted, and the inside of the open shield machine 1 is backfilled by the amount that has been pushed up.

Then, the elevating jack 10 between the upper surface of the backfill 12 and the jack receiving part 9 is extended again, and in this way, the open shield machine 1 is successively pushed up and the whole is brought out onto the ground. (See Figures 3 and 4) [Effects of the Invention] The open shield construction method of the present invention as described above requires the formation of a reaching hole to retrieve the open shield machine from underground at the target destination point. It can be carried out safely and inexpensively without any problems, and it is possible to reduce the process and construction costs and shorten the construction period.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the open shield construction method of the present invention. Figure 5 is a front view of each process, Figure 5 is a vertical side view of the process before the process in Figure 1, and Figure 6 is a side view of the process before the process in Figure 1. FIG. 2 is a vertical side view showing a conventional example. 1...Open shield machine, 1a...Side wall plate,
1b...bottom plate, 1c...tail part, 3...propulsion jack, 4...underground structure, 5...backfilling, 6...
...Starting shaft, 7...Pressure receiving member, 8...Beam member, 9...
... Jacket receiving part, 10 ... Lifting jack, 11
...Achievement pit, 12... Backfill.

Claims (1)

[Claims] 1 A U with open front, rear and top surfaces consisting of left and right side wall plates, a beam member connecting them, and a bottom plate.
An open shield machine, which is a type shield machine, is installed, excavates and removes earth and sand from the front or top of the open shield machine, moves the shield machine forward, and constructs a new underground structure in front of the existing underground structure. The object is suspended into the tail of the shield machine, and the same process of digging and setting up the underground structures is repeated to sequentially bury the underground structures vertically into the ground, In the open shield construction method, the work is completed by backfilling and removing the backfill when the open shield machine reaches the destination.When the open shield machine reaches the destination, the bottom plate and The propulsion jack and the pillar-like pressure receiving member made of box steel or shaped steel were removed, and the left and right side wall plates were simply connected by beam members, with an opening at the bottom without a bottom plate, and the inside of this open shield machine was gradually filled in. The open shield construction method is characterized by interposing a lifting jack between the top surface of the backfill and the open shield machine while returning the backfill, and as the backfill rises, the open shield machine is pushed up until it reaches the ground level by the lifting jack.