JP3031505B2 - Underground structure construction method - Google Patents

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 an underground structure, and more particularly to a method for constructing a subway or an underground structure in a city.

[0002]

2. Description of the Related Art In general, lining-type construction methods are used for underground structures which must be constructed in places where traffic and other buildings are dense, such as subways.

[0003] This is a method of excavating from the ground to form a temporary road surface with an iron plate or the like on the ground while forming a hollow portion in the ground, while performing a ridge where the side walls do not collapse in the ground. It is. This tent is a temporary construction work until the original structure is built, and involves the import and export of materials.

[0004] This method includes a lining type full-section excavation method in which an excavated portion is excavated at once, and a lining type half-section excavation method in which an excavated portion is divided into two parts and alternately constructed.

[0005]

As described above, in the above-mentioned conventional apparatus, (1) a relatively long period of occupation of the road is required. (2) The half excavated part is divided into two parts and alternately constructed. In the cross-section excavation method, it is necessary to change the occupancy to transfer traffic to the left and right (3) It is necessary to cover the road surface (4) It is necessary to turn around because it affects surrounding buried objects (5) Work time (6) It is necessary to remove temporary steel materials such as retaining materials. (7) It is necessary to occupy the road, so the material input place is limited. (8) Drainage treatment is required. (9) It takes a long time to build due to the presence of the retaining material. (10) It requires a certain period of time between demolding, refilling, backfilling, etc. due to the need for concrete curing, and it takes a long construction period. There is a problem.

[0006] In addition, the construction work in urban areas is difficult due to an increase in the number of cargoes to be carried in and out of the landfill site. The present invention has been made in view of the above matters, and (1) shortens the road occupation period (2) reduces the number of occupancy changes (3) does not require installation and removal of retaining materials (4) road surface It is a technical object of the present invention to provide a method for constructing an underground structure capable of greatly reducing a period for installing a temporary road surface such as an iron plate.

[0007]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention relates to a method for sequentially constructing a structure through one to n layers in the depth direction of an underground. Method.

[0008] That is, the first layer 1 is excavated from the ground, and then the first structure 2 is constructed in the first layer 1. Next, a slab 3 is formed on the ceiling portion of the first structure 2 to backfill the ground surface side, and a soil discharging device 4 is suspended on the first structure 2 so as to be movable. To excavate sequentially to the second layer 5.

After that, a second structure 7 including the beam 6 is constructed in the second layer 5, and similarly, an excavation is performed up to the n-th layer 8 to construct an n-th structure 9. N-th structure 9
As a permanent structure.

[0010]

When the first structure 2 is constructed in a space formed by excavating the first layer 1 from the ground, the first structure 2 serves as a retaining material to prevent collapse of the excavated wall surface.

Further, when the slab 3 is formed on the ceiling portion of the first structure 2 and the ground surface side is backfilled, the ground surface becomes the earth surface, and the road surface such as pavement can be used. Therefore, there is no adverse effect on traffic as compared with the conventional method of laying an iron plate or the like.

In this state, a tunnel-shaped space is formed in the ground, and excavation is sequentially performed to the second layer 5 by the earth discharging device 4 movably suspended on the first structure 2. At this time, the soil is discharged from the end or the beginning of the tunnel-shaped space or from a discharge port provided at an appropriate interval. It is desirable that the soil is removed by a belt conveyor.

Subsequently, a second layer 5 including a beam 6 in the second layer 5 is formed.
The structure 7 is constructed. It is desirable that the beam 6 has a structure that is preferably made of a steel frame and has a large mountain retaining effect. Similarly, an n-th structure 9 is constructed by excavating to the n-th layer 8, and these first to n-th structures 9 are used as permanent structures that do not need to be removed.

Therefore, there is no need to carry out a large amount of temporary materials as in the conventional construction method, and the construction period can be shortened. In addition, this construction method can be implemented by either a half-section method or a full-section method.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This embodiment shows an example in which the ceiling forms an arch-shaped tunnel symmetrical to the left and right, and is a half-section type in which the tunnel is separated left and right. Then, the left and right sides are constructed alternately. Then, the support pile 10 located at the center of the portion to be a tunnel and the continuous walls 11, 11 located at the left and right ends are cast in advance and constructed based on this.

The support pile 10 and the continuous walls 11, 11 located at the left and right ends are permanently used as a structure even after completion. [First Stage] As shown in FIG. 1, a support pile 10 located at the center of a portion to be constructed, and a connecting wall 11 located at left and right ends,
11 is placed in advance. The support pile 10 is located at the center of the tunnel, so that the left and right tunnels can be temporarily divided at the time of construction so that the beams 6 and the like can be fixed as a structure.

Further, the connecting walls 11 and 11 become a side wall structure when the tunnel is completed. [Second Stage] As shown in FIG. 2, one construction portion is set to A and the other construction portion is set to B with the support pile 10 as a boundary. Then, the construction starts from the construction part A first.

A support 20 for a portal crane is installed on the ground G of the construction part A, and a crane 21 and a crumb 22 are movably installed on the support 20 for the portal crane. Further, a belt conveyor 23 is installed near the support 20 for the portal crane. These devices dig from the ground and install the arched steel material 24 in the underground space. The arched steel material 24 is provided so as to bridge the support pile 10 located at the center of the portion to be constructed and the one continuous wall 11. In addition, a reinforcing base 5 is provided at a connection portion with the continuous wall 11 so that high strength can be obtained.

A primary beam 30 is provided on the upper part of the arched steel material 24 so as to make a ridge when the arched steel material 24 is installed. The arched steel material 24
Are provided with beams 40, 40 for supporting a traveling crane 4 as an earth discharging device, so that excavation can be continued to a deep portion by the traveling crane 4. As shown in FIG. 4, the traveling crane 4 includes an arch body 42 that can freely travel in the longitudinal direction of the space, and a crane 43 that can move in the direction of arrow F along the arch body 42. .

An RC plate manufactured at the factory is laid on the upper surface of the arched steel material 24, and a superfluid concrete 26 is cast on the upper surface. The RC plate and the concrete 26 constitute the slab 3.

As described above, the arched steel material 24, concrete 2
6. The support pile 10 and the connecting wall 11 are the first
It constitutes the first structure 2 in the layer 1. This first
The structure 2 serves as a substantial retaining material to prevent the excavation wall from collapsing. [Third Stage] As shown in FIG. 3, the ground surface side of the ceiling portion of the first structure 2 in the construction part A is backfilled. The earth and sand used for backfilling is excavated below the first structure 2. Therefore, there is no need to bring in earth and sand from outside. As described above, since there is little import / export from the landfill site, construction in urban areas becomes easy.

At this stage, the ground surface of the construction portion A becomes the earth surface, and can be a full-scale road surface such as pavement. Therefore, there is no adverse effect on traffic as compared with the conventional construction method of laying an iron plate or the like.

Subsequently, the construction part B is constructed in the same manner as the construction part A. After the construction of the arched steel material 24, only the longitudinal resistance for material introduction is left back and buried, so that it is not necessary to change the occupancy. In addition, since only the underground work is performed after the construction of the arched steel material 24, the influence of noise and vibration on the outside can be reduced. [Fourth Step] As shown in FIG. 4, the traveling crane 4 excavates a deep portion, and excavates the second layer 5 sequentially. Discharge is performed by belt conveyors 60, 60 provided on both sides of the support pile 10,
The soil is discharged from the end or the beginning of the tunnel-shaped space, or from a discharge port provided at an appropriate interval.

Subsequently, a second layer formed below the first layer 1 is formed.
A steel beam 6 is installed in the layer 5. This beam 6 is a support pile 1
0 and one connecting wall 11 are provided so as to bridge them. Then, the inside of the room surrounded by the beam 6, the support pile 10, and the continuous wall 11 is reinforced by covering with a prestressed concrete plate 70.

The beam 6, the prestressed concrete plate 70, the support pile 10, and the connecting wall 11 constitute a second structure 7 in the second layer 5 obtained by excavation. Similarly, the third structure 9 is constructed by excavating to the third layer 8,
Concrete is cast on the bottom surface of the third structure 9 to form a base 80. This concrete is of the above-mentioned superfluidity, and by making these operations robotic, significant labor savings can be achieved.

A prestressed concrete plate 70 is provided on all the middle floors located between the layers. Because of this kind of prefabricated structure, it is not necessary to put emphasis on concrete curing, and it is possible to reduce the amount of materials and save labor.

Since the first to third structures 9 are used as permanent structures that do not need to be removed, there is no need to carry out materials for shore retaining, unlike the conventional construction method. In the above embodiment, since the uppermost structure is formed in an arch shape, the slab thickness can be reduced by being strong against a load from above.
Further, since the RC plate is used as the formwork of the steel structure, labor saving of the installer can be achieved. By using superfluid concrete, piping and compaction work can be labor-saving.

[0028]

According to the present invention, a complete road surface can be restored at an early stage of construction, so that road surface lining can be minimized. Therefore, the number of times of occupancy change can be reduced, and the road occupancy period can be shortened.

Further, since it is not necessary to carry in temporary materials for the camp, it is possible to reduce the total amount of materials to be carried in, and to shorten the construction period.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first stage showing an embodiment of the present invention.

FIG. 2 is a sectional view of a second stage showing one embodiment of the present invention.

FIG. 3 is a sectional view of a third stage showing one embodiment of the present invention.

FIG. 4 is a sectional view of a fourth stage showing an embodiment of the present invention.

[Explanation of symbols]

 1, first layer 2, first structure 3, slab 4, earth removal device 5, second layer 6, beam 7, second structure 8, third layer 9, 3 structures

Claims (1)

(57) [Claims] 1. A method for sequentially constructing a structure through one to n layers in a depth direction of an underground, wherein the first layer is excavated from the ground, and then the first structure is embedded in the first layer. And further forming a slab on the ceiling portion of the first structure to backfill the ground surface side, movably suspending the earth discharging device on the first structure, and sequentially using the earth discharging device. Excavation to the second layer, the second including a beam in the second layer
A method of constructing an underground structure, comprising constructing a structure, excavating similarly to an n-th layer to construct an n-th structure, and using the first to n-th structures as permanent structures.