JPH02248522A - Open shield method - Google Patents

Abstract

PURPOSE:To reduce a construction period by repeating a set process of excavation and underground constructions to bury the underground constructions in the ground successively, and pushing up an open shield machine through rising and falling jacks at an objective point to be arrived. CONSTITUTION:The earth in the front of a shield machine 1 is excavated, thrust jacks 3 is extended to move forward the shield machine 1, underground constructions 4 in hung down to set them backward of the jacks 3, a set process of excavation and the underground constructions 4 is repeated and backfill 5 is placed on the underground constructions 4. Then, when the shield machine 1 arrives at an objective point, a bottom plate 1b, the jacks 3 and the like are removed from the shield machine 1. Jack receiving members 9 are mounted to the lower parts of the insides of right and left side wall plates 1a, and 1a, rising and falling jacks 10 are laid between the receiving members 9 and foundation of the bottom, and the jacks 10 are extended to push up the shield machine 1 successively. Accordingly, a construction period can be shortened by omitting an arrival shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an open shield construction method for constructing underground structures such as underground passages for water supply and sewage systems, public drains, telegraph and telephone lines, etc. in urban areas.

[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. 10. In the figure, 1 is an open shield machine, which is a U-shaped shield machine with openings on the front, rear, and top faces, consisting of left and right side wall plates 1a and a bottom plate 1b connecting them. . The open shield machine 1 has the side wall 1
a and the tip of the bottom plate 1b are formed as a cutting edge having a triangular box shape in cross section, and a propelling jack 3 is provided near the center or rear end of the side wall plate la.
are arranged one above the other in the rear direction.

7 in the figure is a pressure receiving member provided at the rear end of the propulsion jack 3.
Box steel or shaped steel was used.

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 advance the shield machine 1, and move 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 part lc of the shield machine 1.

Next, earth and sand is similarly excavated and discharged from the front or upper surface of the shield machine 1, and the shield machine 1 is advanced, and the first
The second underground structure 4 is suspended into the tail IC of the shield machine 1 before the second underground structure 4. 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, and the underground structures 4 at the rear are
Backfill 5 is applied to the top, and the open shield machine 1 reaches the hole 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, in order to construct the reaching shaft 11 by a vertical shaft,
It will be a relatively large-scale construction project, including driving piles for earth retaining. 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 also be required.

An object of the present invention is to provide an open shield construction method that eliminates the disadvantages of the conventional example, allows an open shield machine to be recovered to the ground without a reaching hole, and 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 excavates earth and sand from the front or upper surface of an open shield machine, removes the earth, moves the shield machine forward, and shields a new underground structure in front of the existing underground structure. The machine is lowered into the tail section of the machine, and the same digging and underground structure setting process is repeated to sequentially bury the underground structures vertically into the ground, and then backfill them onto the underground structure at the rear. When the open shield machine reaches its destination, it is removed and the construction is completed. While backfilling the inside of this open shield machine in stages, a lifting jack is interposed between the top surface of the backfill and the open shield machine, and the open shield machine is raised and lowered as the backfill rises. You can use jacks to push it up until it reaches the ground, or at the destination, jack receivers are installed on the outside of the left and right side wall plates of the open shield aircraft, and lifting jacks are interposed between the jack receivers and the ground. The idea is to repeatedly expand and contract the jack and move the jack holder or change the height of the jack holder placed on the ground to push the open shield aircraft up until it reaches the ground.

[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.

The process to reach such a destination, as shown in FIG. 5, is almost the same as the conventional example explained in FIG. 10 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, extend the propulsion jack 3 of the shield machine 1 and launch the launch shaft 6.
The shield machine 1 was moved forward by absorbing the reaction force on the reaction wall inside, and the first underground structure 4 made of a concrete box etc. was suspended from above and contracted inside the tail IC of the shield machine 1. Set it behind the propulsion jack 3.

Next, the 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.
The second underground structure 4 is suspended into the tail part lc of the shield machine 1 before the second underground structure 4, and the same process of digging and setting the underground structure 4 is repeated. , the underground structures 4 are sequentially buried in the ground in columns, and the underground structures 4 at the rear are
Backfill 5 is applied on top.

In this way, when the open shield machine 1 reaches the destination, remove the bottom 11b, propulsion jack 3, column-shaped pressure receiving member 7 made of box steel or shaped steel, etc. from the shield machine 1, and The side wall plates 1a and 1a are simply interconnected by a beam member 8, and have an opening at the bottom without a bottom plate.

As shown in Fig. 1, a jack receiver 9 is attached to the inner lower part of the left and right side wall plates 1a and 1a of the open shield machine l, and a jack receiver 9 is installed between the jack receiver 9 and the ground on the bottom of the shield machine l. If the jack 10 is inserted and 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) In addition, the open shield machine 1 can be moved forward without any object on the bottom plate 1b in places where the ground condition is good, such as on hard ground.
In this case, there is no need to take the trouble to remove the bottom plate 1b.

6 to 9 show a second embodiment of the present invention, in which at the destination, the left and right side wall plates 1a of the open shield aircraft 1,
A jack receiving part 13 is provided protruding outward at the upper end of la, and a lifting jack 10 is interposed between this jack receiving part 13 and the ground.
By repeating step 4, I was able to push open shield aircraft 1 up until it was on the ground.

Note that in this receiver, the stand 14 is made of a laminate or the like, and the height is increased sequentially as necessary. The mounting position can also be shifted sequentially from the top to the bottom.

In this second embodiment, the open shield machine 1 has a bottom plate 1b.
Although it is possible to push up the shield machine 1 with it attached, it is also possible to remove the bottom plate 1b etc. as in the first embodiment and backfill the lower part from inside the shield machine 1 by the amount that the shield machine 1 is pushed up.

〔Effect of the invention〕

The open shield construction method of the present invention as described above can safely and inexpensively retrieve an open shield machine from underground at the target destination point without forming a reach hole, and can save process and cost. This makes it possible to reduce construction costs and shorten the construction period.

[Brief explanation of drawings]

Figures 1 to 4 show the first example of the open shield construction method of the present invention.
5 shows a front view of each process, FIG. 5 is a longitudinal sectional side view of the process before the process in FIG. 1, and FIGS.
FIG. 10 is a front view of each process showing the embodiment, and a vertical sectional side view showing the conventional example. 1...Open shield machine 1a...Side wall plate 1b...Bottom plate IC...Tail part 3...Propulsion jack 4...Underground structure 6...Starting shaft 8...Beam member 9.13... Jack receiving part 10... Lifting jack 12... Backfilling 5... Backfilling 7... Pressure receiving member 11... Reaching hole 14... The receiver is a stand

Claims (3)

[Claims] (1) Excavate and remove earth and sand from the front or top surface of the open shield machine, move the shield machine forward, and suspend the new underground structure into the tail of the shield machine in front of the existing underground structure. Then, by repeating the same excavation and setting process of the underground structures, the underground structures are sequentially buried in the ground in columns, backfilling is performed on the underground structures in the back, and the open shield machine In the open shield construction method, the construction is completed by removing the machine once it reaches the destination, but at the destination, the open shield machine is lifted up until it reaches the ground using a lifting jack. (2) At least at the destination, the open shield machine has an opening at the bottom with no bottom plate, with left and right side wall plates connected by beam members, etc., and the inside of this open shield machine is backfilled in stages. 2. The open shield construction method according to claim 1, wherein an elevating jack is interposed between the return top surface and the open shield machine, and as the backfill rises, the open shield machine is pushed up with the elevating jack until it reaches the ground. (3) At the destination, jack receivers are installed on the outside of the left and right side wall plates of the open shield aircraft, and an elevating jack is interposed between the jack receiver and the ground, and the elevating jacks are repeatedly expanded and contracted to open the shield. The open shield construction method according to claim 1, characterized in that the machine is pushed up until it is above the ground.