KR20040017168A - Construction method for retaining of earth - Google Patents

Abstract

PURPOSE: A cut-off wall sheeting method is provided to facilitate work in a limited space, improve the efficiency in the use of a site by enabling approaching work to the peripheral structures, enable suppression of noise and cost reduction of construction by reducing the size of equipment. CONSTITUTION: A cut-off wall sheeting method comprises steps of boring holes in the ground, where retaining wall bodies are formed, at regular intervals; inserting a pipe pile(10) forming plural injection holes(11) in the bored holes, on a side around a virtual center-line; and injecting cement milk into the pipe pile under high pressure. The cement milk flows out of the pipe pile through the injection holes and a consolidated body together with the peripheral ground is formed.

Description

Construction method for retaining of earth}

The present invention relates to a construction method for the degree of order and earthenware at various construction sites. In particular, when drilling a hole, even a small drilling hole can obtain sufficient order and blocking effect, so that it is easy to work in a narrow space and close construction of surrounding structures is possible. It is possible to reduce the construction cost and to suppress the noise generation, and it is related to the order wall blocking method that can prevent settlement by inducing the darkening of the surrounding ground.

Most of the underground excavation work is carried out when constructing the building to effectively use the limited land.In the process of excavating the underground, most of the earthen walls are installed to enable construction without damaging the existing facilities such as adjacent buildings or roads. After doing the work.

The method for installing the earthen wall is applied to a variety of methods, for example, to put the H file at regular intervals and sandwich the earth plate between the H file, Soil Cement Wall (SCW) method, field Cast-in-place concrete pile (CIP) and soil nailing methods are used.

However, the above-mentioned earthquake blocking methods have a minimum hole diameter of Φ350mm or more (minimum Φ400mm or more for hammer drilling) since the H-pile drilling of the earth wall method, the drilling of the CIP method, and the drilling of the SCW method have a minimum separation distance from adjacent land boundaries. Due to the disadvantage that it should be secured more than 700mm, land boundary invasion is frequent in dense areas of residential areas, and because of the large size of equipment, it is not easy to work in narrow spaces, and has a large influence on surrounding structures, and is very large in noise and vibration. It has the disadvantage of high complaints.

Particularly, in the case of earth wall construction, the backfilling of the earth wall causes the settlement phenomenon due to the relaxation of the surrounding ground, which has a disadvantage of having a great influence on the surrounding structure. In addition, in case of CIP method, there is no fear of sinking, but the construction period is delayed because the double hole can not be constructed continuously, and the construction cost is increased by more than 300% of the earth wall construction, and the occurrence of civil complaints is high due to noise vibration during drilling. However, due to poor connection between the pillars, the water quality is lowered, and there is a problem of needing a separate method of leaking due to the high possibility of soil loss. In addition, the SCW method has the advantage that the continuous construction is possible, but the noise and vibration caused by the large size of the equipment is very large, causing civil complaints, and the construction cost is also increased by more than 300% of the earth wall construction, and the soil structure, Since weathering soil should be included more than 50%, it has the disadvantage that the limitation of site ground condition is very severe during construction.

Therefore, the present invention can obtain a sufficient degree of order and blocking effect even with a small drilling hole (Φ200mm or less, preferably Φ102mm), and it is easy to work in a narrow space, and it is possible to perform a close construction of the surrounding structure, and thus the use efficiency of land is high. In addition, it is possible to reduce the noise and reduce construction costs by miniaturizing the equipment, and to provide a water barrier wall construction method that can minimize civil complaints by preventing settlement by inducing darkening of the surrounding ground.

1 is a perspective view showing an example of a pipe pile according to the present invention.

FIG. 2 is a cross-sectional view of the pipe pile shown in FIG. 1. FIG.

3 is a perspective view of a cover plate for the pipe pile.

4 is a state of use in the combined state of the pipe pile and the cover plate.

5 is a view schematically showing a water barrier wall construction method according to the present invention,

5A is a view showing a state in which a hole is drilled in the ground;

5B is a view illustrating a state in which a pipe file is inserted into a drilled hole.

Figure 5c is a view showing a state injecting cement milk into the pipe pile,

Fig. 5d is a sectional view of the ground with cement milk injected into the pipe pile fixed;

Fig. 6 is a sectional view of the ground on which two or more rows of pipe piles are formed to form an earth wall.

7 is a view schematically showing an example of a method for enhancing shear resistance due to independence and lateral pressure of a retaining wall;

8 is a view schematically showing another example of a method for enhancing shear resistance due to independence and lateral pressure of a retaining wall;

9 is a view showing a state in which an H file and a pipe file are constructed in parallel.

10 is a view showing a state in which the earth wall is constructed after the H file and the pipe pile are constructed in parallel to form a wall.

11 is a view showing a state in which two or more columns of pipe files and an H file are constructed in parallel.

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

10 pipe file 11: injection hole 20: cover plate

21: injection hole 30: drilling device 40: drilling hole

50: cement milk injector 60: rebar 70: head concrete

80: earth plate 90: wire mesh 100: H file

110: H beam G: soil C: solidified

CL: centerline

The present invention to achieve the above object

Holes are drilled at regular intervals on the ground to form the wall, and then the pipe pile is formed with a plurality of injection holes formed in one direction only on the basis of the virtual center line, and cement milk is applied to the pipe pile. It is injected at a high pressure to provide a cushioning wall blocking method characterized in that the cement milk flows out of the pipe pile through the injection hole to form a solid body with the surrounding ground.

DETAILED DESCRIPTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, which are presented to aid the understanding of the present invention, but the present invention is not limited thereto.

1 is a perspective view showing an example of a pipe pile according to the present invention, Figure 2 is a cross-sectional view of the pipe pile shown in Figure 1, the pipe pile 10 according to the present invention as shown in FIG. ), A plurality of injection holes 11 are formed, and when the pipe pile 10 having such a structure is inserted into a hole drilled at a predetermined interval and the cement milk is injected at a high pressure, the cement milk opens the injection holes 11. Through the pipe pile 10 is to be leaked to the outside, according to the cement milk together with the surrounding ground to form a solid body it is possible to achieve the darkening of the surrounding ground.

In particular, the plurality of injection holes 11 formed in the pipe pile 10 according to the present invention are formed only in one direction based on the virtual center line CL, which is the injection hole 11 of the pipe pile 10. It is inserted so as to face the opposite side of the gulting surface so that the cement milk can form a solid body together with the soil around the wall opposite the gulting surface.

The pipe pile 10 shown in FIGS. 1 and 2 may further include a cover plate 20 to prevent the cement milk from being discharged to the ground due to the high pressure during the injection of the cement milk. 3 shows a perspective view of the cover plate for the pipe pile, and the cement milk is injected through the inlet 21 of the cover plate 20.

4 is a view showing the state of use in a state in which the pipe pile and the cover plate is coupled, when the cement milk is injected into the pile pile 10 at a high pressure flows to the outside through the injection hole 11 and the surrounding ground and To form a solid body, the cover plate 20 at this time serves to prevent the cement milk is discharged to the ground.

5 is a view schematically showing the order wall clogging method according to the present invention, with reference to the drawing to describe the order wall clogging method according to the present invention in more detail as follows.

In the present invention, first, the hole 40 is drilled at regular intervals on the ground to form the wall of the earth (FIG. 5A). Drilling is carried out using a small drilling device 30, such as a crawler drill, to excavate Φ200mm or less (appropriate Φ102mm) to the ground G, and the depth of the hole 40 to excavate is structural calculation of the ground G to excavate. Decide by As such, the present invention is very small in noise and vibration compared to the existing drilling equipment (Φ350mm or more), so that the small size of the complaints can be minimized and work in a narrow space. It can be carried out easily.

When the drilling is completed, the pipe pile 10 according to the present invention is inserted into the drilled hole 40 (FIG. 5B). At this time, the injection hole 11 formed in the pipe pile 10 is inserted so as to face the opposite side of the gulchwi.

When the insertion of the pipe pile 10 is completed, the cover plate 20 is put on the pipe pile 10 and cement milk is injected at high pressure (FIG. 5C). At this time, the injection pressure of the cement milk can be changed according to the soil environment of the ground (G) to excavate, preferably 10 ~ 12Kg / ㎠ when the main component of the surrounding soil is viscous soil, 10 ~ 15Kg / ㎝, sandy gravel In soils containing sand as a main component, cement milk may be injected at an injection pressure of 15 to 25 kg / cm 3.

At this time, the cement milk used may be prepared by mixing cement and water in a normal ratio, in the present invention was used by mixing the cement and water in a 1: 1 weight ratio.

When the cement milk is injected into the pipe pile 10 at a high pressure as described above, as shown in FIG. 5C, the cement milk is discharged to the outside of the pipe pile 10 through the injection hole 11 and the surrounding ground G and the ground. Together, they form a solid body. In the present invention, as the plurality of injection holes 11 formed in the pipe pile 10 is directed toward the opposite side of the pit surface, cement milk forms a solidified body together with the ground wall opposite the pit surface. It is possible to condense the cancer and contribute to the prevention of settlement.

FIG. 5D is a cross-sectional view of the ground in which cement milk injected into the pipe pile is solidified, and as shown, a huge solidified body C is formed on the opposite side of the pit soil surface GF, and thus, the pipe pile 10 After cement milk is filled in, the solidified body (C) is formed together with the surrounding ground (G), thereby greatly increasing the independence of the pipe pile (10), thereby eliminating the strut process required in the general construction process. This can shorten the air and reduce the construction cost.

The effective diameter in which the solidified body (C) is formed depends on the soil condition of the ground (G), and the effective diameter is 0.8 to 1.0 m in the case of viscous soils, 0.8 to 1.2 m in the sandy soil, and 0.6 to 0.8 in soils mainly composed of gravel or sand. m. In addition, the lateral compressive strength is 20 to 30 Kg / cm 3 when the soil is viscous soil, 40 to 80 Kg / cm 3 when sandy soil, and 80 to 100 Kg / cm 3 when soil is mainly composed of gravel or sand.

Since the effective diameter in which the solidified body (C) is formed varies depending on the soil environment of the surrounding ground (G), the hole is drilled at regular intervals after sufficiently understanding the structure by the surrounding ground and geology immediately before the construction of the earthen membrane. It is preferable to perform an earthquake construction. In addition, the pipe pile 10 may be constructed in two or more rows in order to secure a more perfect order and to ensure the independence of the retaining wall.

6 is a cross-sectional view of the ground on which two or more rows of pipe piles are used to form an earth wall. As shown in the figure, as the pipe pile 10 is constructed in two or more rows, the solidified bodies (C) are interconnected to secure a more perfect order, and at the same time, the resistance of the walls is enhanced to be useful in soft ground. Can be.

As described above, according to the present invention, the clogging method can obtain sufficient degree and clogging effect even with a small drilling hole (Φ200mm or less, preferably Φ102mm), so that it is easy to work in a narrow space and close to the surrounding structure. Since the land boundary is possible up to 200mm, it has the maximum efficiency of the earth, and the dark ground effect of the surrounding ground can be obtained, thereby securing the safety against settlement. In addition, it can reduce the construction period (more than 30%) and reduce the construction cost (more than 30%), and it can reduce the possibility of civil complaints caused by noise and vibration.

In the present invention, in order to improve the independence of the wall and the shear resistance due to the lateral pressure can be carried out as shown in Figures 7 and 8.

FIG. 7 is a view schematically illustrating an example of a method for increasing shear resistance due to independence and lateral pressure of a retaining wall, and inserting a plurality of reinforcing bars 60 into the pipe pile 10 as shown, and then cement milk. After forming a solidified body by injecting shows that the head concrete 70 is formed to the top of the pipe pile to improve the shear resistance by the lateral pressure. The head concrete 70 is formed by reinforcing the rebar in the transverse direction of the plurality of pipe piles 10, or by placing the H beam 110 in the transverse direction, and then cast it with cement concrete to provide shear resistance due to lateral pressure. Promote can significantly increase the independence of the pipe pile 10 during the construction of the retaining wall.

FIG. 8 is a view schematically showing another example of a method for increasing shear resistance due to independence and lateral pressure of a retaining wall. As shown in FIG. 8, the H beam 110 is left in the upper transverse direction of the pipe pile 10. In order to form the head concrete 70 by pouring cement concrete, the wall is constructed, and after the wall is constructed, the wire mesh 90 and the shotcrete are sprayed on the wall surface between the pipe piles 10 to form a wall surface. At the same time shows the installation of the earth plate 80. In this way, it can cope with any surrounding ground structure, and it is a method that escapes the old method of earth wall work depending on manpower, and prevents incomplete construction of back filling, and shortens air, labor cost and construction. Material cost savings can be achieved.

Soil blocking method according to the present invention can be installed in parallel with other methods, such as brace method or earth plate method, it can be made selectively depending on the construction needs.

For example, the pipe pile 10 according to the present invention can be installed in parallel with the H file 100, Figure 9 is a state in which the construction of the H file 100 and the pipe pile 10 according to the present invention in parallel FIG. 10 is a view showing a state in which the earth plate 80 is constructed after the H pile 100 and the pipe pile 10 are formed in parallel to form a wall, and FIG. 11 is a pipe pile 10 having two or more rows. ) And H file (100) is a view showing a state in which the construction in parallel.

The construction method of Figure 9 can be applied to the stable ground as can be carried out to reinforce the independence. The construction method of Figure 10 can be carried out to maximize the stabilization of the wall after the construction of the pipe pile is suitable as an alternative construction of the CIP, SCW method. The construction method of FIG. 11 can be constructed when the perfect order is required in the soft ground, and is also possible as a substitute for the sulrry wall method.

As described above, the existing construction method should be punctured at least Φ350mm (at least Φ400mm at the time of hammer drilling), so the separation distance from the adjacent site boundary should be secured at least 700mm. In addition, it is not easy to work in a narrow space due to the large size of equipment, and has a disadvantage of high impact on surrounding structures, high noise and vibration, and high complaints. However, the method according to the present invention has a small diameter. (Φ200mm or less, preferably Φ102mm) It is possible to miniaturize the equipment to reduce noise and reduce construction costs, as well as to prevent settlement by inducing darkening of the surrounding ground to minimize civil complaints. .

The present invention has been described above with reference to the accompanying drawings, which are merely exemplary and can be combined with various methods other than the illustrated drawings, and various modifications are possible.

As described above, the present invention has the greatest advantage that can be constructed close to the ground and elimination of complaints due to the miniaturization of the equipment, and also, when the construction of the existing earthquake method construction, the structural defects on the surrounding ground It is possible to shorten the air by the smooth construction of the earthquake construction by blocking the source, and by constructing the pipe pile with excellent bending rigidity, it is excellent in independence of the pile and can skip the brace process. It is a useful invention that provides a water barrier wall construction method that can perform a construction smoothly by creating an environment that can safely and quickly build an underground structure, and can secure high construction and economical efficiency.

Claims (4)

Holes are drilled at regular intervals on the ground to form the wall, and then the pipe pile is formed with a plurality of injection holes formed in one direction only on the basis of the virtual center line, and cement milk is applied to the pipe pile. It is injected at high pressure, cement milk flows to the outside of the pipe pile through the injection hole to form a solid body together with the surrounding ground to form a barrier wall. The method according to claim 1, wherein the injection hole of the pipe pile is inserted to face the opposite side of the pit surface so that the cement milk to form a solid body together with the soil around the wall opposite the pit surface. The method according to claim 1 or 2, wherein a plurality of reinforcing bars are inserted into the pipe pile and then cement milk is injected to form a solid body, and then the head concrete is placed on top of the pipe pile. A water barrier wall construction method, comprising the construction method of claim 1 and the support method or earth plate method in parallel.