JPH06306853A - Construction of underground structure - Google Patents

Abstract

PURPOSE:To enable it to construct an underground continuous wall and a large sectional underground structure used with this wall simply in a short time, besides safely. CONSTITUTION:In use of an open type boring machine 1 installed with two digging jacks 2 in a machine body, where those of front, rear and upper faces are opened, in arranging them up and down toward the rear, earth and sand are digged and discharged out by a digging and discharging part 1d of this boring machine 1. In this case, these digging jacks 2 are extended and a concrete wall body 4 is used as a reaction, thereby advancing the boring machine 1 forward. A new concrete wall body 4 is hung down from the upside as a set in a tail part 1c of the boring machine 1, and it is connected to the existing concrete wall body 4. These operations are properly repeated and those of concrete wall bodies 4 are embedded in files, constructing an underground continuous wall body 5 in two rows at intervals. An interval between these underground continuous walls 5 is digged, and a concrete block 8 is installed on the bottom, connecting it to the underground continuous wall 5, and the whole body is formed into an H-type structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous underground wall and a method of constructing an underground structure as a large-section structure using the continuous underground wall.

[0002]

2. Description of the Related Art Conventionally, as a retaining wall for forming an underground structure, parent piles such as H-section steel are laid on the center line of a planned retaining wall at intervals of about 1 m to 2 m. As the excavation progresses, the main pile side sheet pile method, which is configured by inserting the side sheet pile, is typical.

In addition to the parent pile side sheet pile system, a steel sheet pile or steel pipe sheet pile system in which sheet piles, steel pipes, and other sheet piles are continuously struck one by one to form a water retaining wall.
There is also a column-column pile method in which cast-in-place concrete (including soil concrete) is continuously cast to form a retaining wall.

[0004]

The above-mentioned horizontal pile pile method for parent piles can relatively economically form the earth retaining wall and can be applied to hard ground where steel sheet piles cannot be placed, but since it does not have water stopping ability. It is not suitable for the ground with a lot of groundwater, over-excavation is likely to occur when inserting a horizontal sheet pile, and the surrounding ground is likely to move or sink, and the heaving phenomenon is likely to occur. . Since there are many types of steel sheet piles or steel pipe sheet pile methods, it is possible to use those having a cross section that meets the usage conditions, but the initial cost may be high, and hard ground such as gravel layers cannot be punched.
Further, since the rigidity of the sheet pile is not so high, the driving length is limited.

Since the column-row pile method has less deflection, the back soil does not move and the surrounding ground is less affected. Moreover, although the strength dimension can be planned, the construction period is long and the construction cost is high.

An object of the present invention is to solve the inconvenience of the above-mentioned conventional example, and to provide a method for constructing an underground structure which can construct a continuous underground wall body and a large-section underground structure using the same easily and safely in a short time. To provide.

[0007]

In order to achieve the above-mentioned object, the present invention comprises a side wall plate and a bottom plate, and the propulsion jacks are arranged vertically in a rearward direction in a fuselage having front, rear and upper faces opened. Using an open type excavator, a step of excavating and discharging earth and sand in front of the front or top opening of this excavator, and a step of extending the propulsion jack and making the concrete wall body a reaction force to advance the excavator. , A new concrete wall body is hung from above and set behind the propulsion jack contracted in the tail part of the excavator, and the process of connecting this to the existing concrete wall body is repeated as appropriate to sequentially construct the concrete wall body. Embedding in vertical rows to form an underground continuous wall, and constructing this underground continuous wall in two rows at intervals, excavating between the underground continuous walls, and concrete at the bottom Floor slab This was combined with the underground continuous wall Te, it is an gist that the entirety is taken as H-shaped structure.

[0008]

According to the present invention, the continuous underground wall can be quickly and easily constructed by a rational construction method utilizing the advantages of the open cut construction method (open cut construction method) and the shield construction method. An H-shaped large-section underground structure using walls can be easily and safely constructed.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, the construction method of the underground continuous wall body in the present invention will be explained. In the figure, 1 is an excavator, which is a front surface, a rear surface and a left side wall plate 1a and a bottom plate 1b connected to these side wall plates 1a. It has a body with an open top.

In this machine, the tips of the side wall plate 1a and the bottom plate 1b are formed as blade openings, and the partition wall 3 is formed at the center of the side wall plate 1a.
Further, the propulsion jacks 2 are arranged rearward of the partition wall 3 and arranged in multiple stages vertically facing rearward. In this way, the excavator 1 excavates and excavates in front of the bulkhead 3.
d, the rear part is a tail part 1c for installing a concrete wall.

Although not shown, a starting pit is constructed, and the excavator 1 is installed in the starting pit, the propulsion jack 2 is extended, and a reaction force is applied to the reaction wall in the starting pit to advance the excavator 1 Then, the first concrete wall body 4 forming the below-mentioned underground continuous wall body 5 is hung from above and set behind the propulsion jack 2 compressed in the tail portion 1c of the excavator 1. The concrete wall body 4 is made of a precast concrete plate.

The excavator 6 excavates earth and sand from the front or upper surface of the excavator 1 and discharges it. The excavator 1 is a vertically long one, and this excavator 6 has a base machine installed on the ground, and the excavator can be arranged so as to be suspended from the cutting edge of the excavator 1 according to the length of the excavator 1. Well, as an example, a screw auger type excavator can be used. In addition, as other examples, various types of excavators 6, such as a drilling bucket type and a type of excavating with jet water to collect muddy water, can be considered.

After excavation and soil removal by the excavator 6, the propulsion jack 2 is extended to advance the excavator 1. During this forward movement process, the second concrete wall body 4 is placed in front of the first concrete wall body 4 and the tail portion 1 of the excavator 1 is installed.
Suspend in c. Thereafter, the same earth discharging step, advancing step, and setting step of the concrete wall body 4 are appropriately repeated, and the concrete wall body 4 is sequentially left in the ground in a row along with the forward movement of the excavator 1.

When the partition wall 3 is provided, it is possible to compact the earth and sand when the excavator 1 is excavating, and to facilitate excavation and earth removal by the excavator 6. When the concrete wall body 4 is suspended in the tail portion 1c of the excavator 1, the concrete wall body 4 is mutually connected and integrated with the existing concrete wall body 4. Reinforcing bars for joints shall be inserted inside and shall be connected by screw joints, couplers, etc.

In this way, the concrete wall bodies 4 left in the ground in a row along with the forward movement of the excavator 1 form a continuous underground wall body 5, but if necessary, the surrounding gaps may be backfilled. Also, grout. Finally, the excavator 1 leads to the reaching hole and is removed here.

The above is the construction of the underground continuous wall body 5, but in the present invention, as shown in FIG. 4, the underground continuous wall body 5 is constructed in two rows at intervals, and is shown in FIG. Thus, the space between the underground continuous walls 5 is excavated (root cutting). The root cut bottom does not go to the lower end of the underground continuous wall body 5, but is located in the middle, and the vicinity of the lower end of the underground continuous wall body 5 is kept stuck in the ground, and the supporting force is obtained at this portion.

The underground continuous wall body 5 acts as an earth retaining wall. However, as the root cutting progresses, an earth anchor 7 is provided on the underground continuous wall body 5 if necessary.
This may increase the bearing capacity of the underground wall 5.

Then, as shown in FIG. 6, a gravel stone or a crushed concrete is applied to the root cutting bottom, and a concrete floor slab 8 is provided by placing concrete on the bar and reinforcing it. The concrete floor slab 8 connects the joint reinforcement protruding from the wall surface of the underground continuous wall body 5 and the reinforcing bar which is reinforced and is integrally connected to the underground continuous wall body 5 to form an H-shaped structure as a whole. To do.

The H-shaped structure can be used as a large-section underground structure for roads, waterways and the like.

By the way, the excavation (root cutting) between the underground continuous wall bodies 5 and the formation of the concrete floor slab 8 may be performed after all the designed lengths of the underground continuous wall bodies 5 have been constructed. It is also possible to sequentially proceed according to the formation of the continuous underground wall 5. For example, if the underground continuous wall 5 is constructed for several meters or a dozen meters, excavation (root cutting) and formation of the concrete floor slab 8 are performed with a delay of several meters from the end, and then the underground continuous wall 5 is extended. Set up
Further, it is also possible to carry out a construction in which the construction length of the H-shaped structure is sequentially extended by repeating excavation (root cutting) and formation of the concrete floor slab 8.

[0021]

INDUSTRIAL APPLICABILITY As described above, the method for constructing an underground structure according to the present invention is capable of constructing an underground underground wall or a large-section underground structure using the underground structure easily, quickly and safely. is there.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a method of constructing an underground structure of the present invention, showing construction of an underground continuous wall body.

FIG. 2 shows one embodiment of the method for constructing an underground structure of the present invention, and is a vertical cross-sectional side view showing the construction of a continuous underground wall.

FIG. 3 is a plan view in the case of constructing an H-shaped structure by the underground structure construction method of the present invention.

FIG. 4 is a vertical sectional front view showing a step before root cutting when an H-shaped structure is constructed by the underground structure construction method of the present invention.

FIG. 5 is a vertical sectional front view showing a step after root cutting in the case of constructing an H-shaped structure by the method for constructing an underground structure of the present invention.

FIG. 6 is a vertical cross-sectional front view showing formation of a concrete floor slab after root cutting in the case of constructing an H-shaped structure by the method for constructing an underground structure of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavator 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 1d ... Excavation / discharging part 2 ... Propulsion jack 3 ... Partition wall 4 ... Concrete wall body 5 ... Underground continuous wall body 6 ... Excavator 7 ... Earth anchor 8 … Concrete floor slabs

Claims (3)

[Claims] 1. An open-type excavator, which is composed of a side wall plate and a bottom plate, and in which the propulsion jacks are arranged rearward in a vertical direction in a body having front, rear, and upper surfaces open,
The step of excavating and discharging earth and sand in front of the front or upper surface opening of the machine, the step of extending the propulsion jack to make the concrete wall body a reaction force to move the machine forward, and the contraction in the tail of the machine A new concrete wall body is hung from the top behind the propulsion jack and set, and the process of connecting this to the existing concrete wall body is repeated as appropriate to sequentially bury the concrete wall bodies in columns to form a continuous underground wall. A method of constructing an underground structure characterized by forming a body. 2. An open type excavator comprising a side wall plate and a bottom plate, the propulsion jacks facing rearward and arranged vertically in a body having front, rear and upper surfaces opened,
The step of excavating and discharging earth and sand in front of the front or upper surface opening of the machine, the step of extending the propulsion jack to make the concrete wall body a reaction force to move the machine forward, and the contraction in the tail of the machine A new concrete wall body is hung from the top behind the propulsion jack and set, and the process of connecting this to the existing concrete wall body is repeated as appropriate to sequentially bury the concrete wall bodies in columns to form a continuous underground wall. The body is constructed in two rows at intervals, excavation is performed between the underground continuous wall bodies, a concrete floor slab is provided at the bottom of the body, and this is connected to the underground continuous wall body, and the whole is an H-shaped structure. The construction method of the underground structure characterized by the following. 3. The method for constructing an underground structure according to claim 2, wherein the excavation between the underground continuous walls and the construction of the concrete floor slab are sequentially performed according to the formation of the underground continuous walls.