KR20090058062A - New diaphragm wall used trench excavation with double sheetpile system : dss diaphragm wall method - Google Patents

Abstract

An underground diaphragms wall mounting method using a double sheet pile trench wall is provided to reduce the construction cost and the construction period. An underground diaphragms wall mounting method using a double sheet pile trench wall comprises: a step of setting up a sheet pile(1) at the outer side of an underground structure wall; a step of punching an H-pile for the lower part rock layer excavation; a step of setting up an inside support member(2) after digging out an inner trench of the sheet pile; a step of forming the underground structure wall by arranging a reinforcing bar and placing the concrete inside the trench after the digging is complete; a step of drawing the sheet pile and collecting; a step of setting up an outside support member in the underground diaphragm wall; and a step of completing underground diaphragm wall support structure to the top of a building from the bottom by repeatedly performing the step of mounting the outside support member.

Description

New Diaphragm Wall used Trench Excavation with Double Sheetpile System: DSS Diaphragm Wall Method}

The present invention relates to the structure and construction method of the continuous underground wall to resist external forces such as earth pressure and water pressure during construction of underground excavation and to minimize damage to adjacent ground or structures.

The present invention relates to the structure and construction method of the continuous underground wall to resist external forces such as earth pressure and water pressure during construction of underground excavation and to minimize damage to adjacent ground or structures.

In general, underground continuous wall construction method is to install the guide wall (Guide Wall), filling the stabilizer (Bentonite) to the excavation ground to form a hollow wall and then excavation using the equipment such as hang grab, hydro mill. After the excavation, the fabricated reinforcement net is introduced into the hollow wall, and the concrete is poured to form a continuous reinforced concrete wall in the ground.

Underground continuous wall construction method is more rigid than other earthquake construction methods. Therefore, it is structurally safe for long-term construction, and can be used as sidewall of structure.

The conventional underground continuous wall construction method uses bentonite stabilizer to maintain the hollow walls, which causes contamination of groundwater and soil, and requires a large plant and equipment to secure a construction site of a certain size or more. In addition, concrete placing work is performed by using tremi tube in stabilizer mixed with fine soil inside the hollow wall, which causes problems such as deterioration of concrete strength and poor quality, and it contains stabilizer and soil powder used after completion of excavation and concrete placing. It is accompanied by problems in the construction process, such as the treatment of tofu after sludge treatment and concrete curing, difficulty in treating waste generated by wall cleaning during the removal of guide wall, removal of guide wall and underground excavation.

The present invention can form a stable hollow wall that can support the earth pressure and water pressure even in a narrow site without using a stabilizer when trench excavation work for the construction of underground continuous wall, environmentally friendly, shortening the construction period and construction cost It is to provide a structure and construction method of the continuous wall to reduce the cost.

(Solution of problem)

The present invention uses the structure and construction method of the following continuous underground wall to solve the above problems.

Underground continuous walls that support loads such as earth pressure and water pressure during excavation; In the underground continuous wall support structure to be constructed including the external support material to be installed toward the underground continuous wall, the underground continuous wall is an inner support material for supporting the sheet pile and the sheet pile to be installed on the outer side of the underground structural wall and the sheet Reinforcing reinforcing steel and concrete is constructed inside the pile, and forms the structure of the continuous continuous wall of the role of the retaining wall during the excavation and finally acts as the underground structural wall of the structure,

(a) installing a sheet pile on an outer side of an underground structural wall to be formed;

(b) installing an internal support while excavating a trench inside the sheet pile;

(c) reinforcing reinforcement and concrete in the trench after completion of the excavation;

(d) drawing and withdrawing the sheet pile;

(e) installing an external support on the base continuous wall;

(f) repeating step (e) to complete the underground continuous wall support structure; using the method of constructing the continuous underground wall, characterized in that it comprises a.

In the present invention, since the hollow wall is formed by the sheet pile 1 and the internal support member 2, the following effects are expected as compared with the conventional underground continuous wall construction method.

First, it is possible to work on a small site because it does not require large equipment, and by installing underground structure walls directly, it maximizes the use of the site and uses a small number of large equipment through simultaneous input of appropriate manpower for excavation scale. Air shortening is possible.

Second, since the sheetpile itself is ordered, the degree of ordering is assured during excavation, and concrete is poured after all the trenches are excavated.

third. Since the gap between the sheets can be arbitrarily adjusted, various building plan designs can be accommodated and separate formwork can be installed inside the hollow walls, allowing the wall thickness of specific parts to be arbitrarily adjusted.

Fourth, there is no soil pollution because it does not use a stable solution (Bentonite), environmentally friendly, concrete strength and quality of the underground wall is sure.

Fifth, the sheetpile can be used as a formwork as it is, and at this time, the economical efficiency can be improved because the sheetpile is recovered by applying a release agent or installing a spacer. Also, the sheetpile installed on the back side can be used as a waterproof wall.

Sixth, guide wall removal, tofu cleanup and wall cleanup are not necessary, so the process is simplified and construction waste is not generated.

Hereinafter, the configuration of the present invention through the specific embodiments shown in the accompanying drawings in detail as follows.

The present invention comprises the steps of installing the sheet pile (1) to the outside of the underground structural wall to be constructed, drilling and installing the H-pile for the excavation of the lower rock layer, while digging the trench inside the sheet pile (1) while supporting the internal support ( 2) installing, after the excavation is completed, forming an underground structural wall by reinforcing reinforcement and concrete placing in the trench, drawing and collecting sheet piles, installing an external support material 62 on the underground structural wall, It is the structure and construction method of the lower continuous wall, characterized in that the technical configuration consisting of the step of completing the retaining wall support structure to the lowest basement floor of the building by repeating the installation step of the external support material (62).

Figure 1 is an embodiment of the step of installing the sheet pile (1) on the outside of the underground structural wall. Sheet pile (1) primarily supports earth pressure and water pressure during underground excavation. The shape of the sheet pile 1 may be corrugated or straight, which is favorable for earth pressure support. However, the sheet pile 1 may be linear in consideration of recycling through recovery. In FIG. 1, the sheet pile 1 is expressed as being installed to the upper end of the lower rock layer in consideration of workability and economic efficiency, but may be installed at the lower rock layer.

Figure 2 is an embodiment of the drilling and installation step of the H-pile for excavation of the lower rock bed. This step is to form a structure of a general earth wall to be applied to the rock layer in order to maximize the workability and economics of the present invention. If the lower ground is not a rock layer, it is easy to install the sheet pile (1), or this step is not necessary if the sheet pile (1) is installed to the rock layer.

3 is one embodiment of the step of installing the inner support material (2) while excavating the trench inside the sheet pile (1). The inner supporter 2 serves to support the sheet pile 1, and can be easily inserted into the sheet pile 1 or by using a turnbuckle structure to facilitate length adjustment.

Trench excavation can use small equipment for the efficiency of excavation, but mainly manpower is used, so it is not necessary to use large equipment like the conventional construction method, so it is possible to work on small land, and through the simultaneous input of appropriate manpower suitable for the excavation scale It is possible to shorten the air and reduce the construction cost compared to the conventional construction method using large equipment.

Figure 4 is an embodiment of the step of forming the underground structural wall by reinforcement and concrete placement in the trench after the end of the excavation. In the embodiment of FIG. 4, the width of the hollow wall by the sheet pile 1 and the thickness of the underground structural wall are the same, but it is also possible to arbitrarily adjust the wall thickness of a specific part by installing a separate formwork inside the hollow wall.

5 is one embodiment of the drawing and withdrawal step of the sheet pile (1). In order to facilitate the recovery of the sheet pile (1), a release agent is applied or a spacer is installed, and the economic efficiency is improved through the recycling of the sheet pile (1).

Figure 6 is an embodiment of the step of installing the external support material 62 to the underground continuous wall formed through the step of Figure 5 in FIG. 6 (a) and 6 (b) show the reinforced concrete structure and the steel frame as the external support material 62, respectively, but the structure can support the underground continuous wall, regardless of the material or shape of the external support material 62. Applicable

(Effects of the Invention)

As described above, since the present invention forms an empty wall by the sheet pile (1) and the internal support member (2), the following effects are expected as compared with the conventional underground continuous wall construction method.

First, it is possible to work on a small site because it does not require large equipment, and by installing underground structure walls directly, it maximizes the use of the site and uses a small number of large equipment through simultaneous input of appropriate manpower for excavation scale. Air shortening is possible.

Second, since the sheetpile itself is ordered, the degree of ordering is assured during excavation, and concrete is poured after all the trenches are excavated.

third. Since the gap between the sheets can be arbitrarily adjusted, various building plan designs can be accommodated and separate formwork can be installed inside the hollow walls, allowing the wall thickness of specific parts to be arbitrarily adjusted.

Fourth, there is no soil pollution because it does not use a stable solution (Bentonite), environmentally friendly, concrete strength and quality of the underground wall is sure.

Fifth, the sheetpile can be used as a formwork as it is, and at this time, the economical efficiency can be improved because the sheetpile is recovered by applying a release agent or installing a spacer. Also, the sheetpile installed on the back side can be used as a waterproof wall.

Sixth, guide wall removal, tofu cleanup and wall cleanup are not necessary, so the process is simplified and construction waste is not generated.

Figure 1 is an embodiment of the step of installing the sheet pile (1) on the outside of the underground structural wall.

2 is one embodiment of the drilling and installation steps of the H-pile 61 for excavation of the lower rock bed.

Figure 3 is one embodiment of the step of installing the inner support material 2 while excavating the trench inside the sheet pile.

Figure 4 is an embodiment of the step of forming the underground structural wall by reinforcement and concrete placement in the trench after the end of the excavation.

5 is one embodiment of the drawing and recovery step of the sheet pile.

Figure 6 is an embodiment of the step of installing the external support material 62 to the underground continuous wall formed through the step of Figure 5 in FIG.

<Description of the symbols for the main parts of the drawings>

1: Sheet pile 2: Internal support material

61: h-pile 62: External support

Claims (2)

Underground continuous walls that support loads such as earth pressure and water pressure during excavation; In the underground continuous wall supporting structure to be constructed, including; The underground continuous wall is a sheet pile to be installed on the outer side of the underground structural wall and the inner support material for supporting the sheet pile and the reinforcing reinforcement and concrete is constructed inside the sheet pile, the role of the retaining wall during excavation And finally, the structure of the continuous continuous wall that acts as the underground structural wall of the structure. (a) installing a sheet pile on an outer side of an underground structural wall to be formed; (b) installing an internal support while excavating a trench inside the sheet pile; (c) reinforcing reinforcement and concrete in the trench after completion of the excavation; (d) drawing and withdrawing the sheet pile; (e) installing an external support material on the continuous continuous wall; (f) repeating step (e) to complete the underground continuous wall support structure; Construction method of the continuous continuous wall, characterized in that comprises a.

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