KR101928940B1 - Waterproof retaining method and retaining system with low excavated soil emissions and high strength properties - Google Patents

Abstract

The present invention relates to a waterproof earth retaining method with low excavated soil emission and high strength properties and an earth retaining system for the same, in which no separate drilling work is required when constructing a cutoff wall and the amount of excavated soils to be treated is small when drilling the ground, thereby providing economic efficiency, and the crack bending moment, fracture strength moment and shear strength performance are excellent through the rearrangement of steel wires. The earth retaining method of the present invention relates to an earth retaining method for constructing an earth retaining wall by constructing PHC-W piles in a line in the lateral direction, comprising: a step for drilling the ground in a line so as to form holes in succession with each other such that neighboring holes have partially overlapped portions therebetween; a step for leaving at least part of the soil generated during the drilling as it is in the holes; a step for forming ground-improving soil to be filled in the holes through the deep mixing process, in which the cement is injected into the holes and immediately mixed and stirred together with the soil generated during the drilling; and a step for inserting PHC-W piles into the respective holes in a line while the ground-improving soil is filled in the holes, and providing intervals between neighboring PHC-W piles such that the ground-improving soil is filled in the interval spaces.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water retention system and a soil retention system,

The present invention relates to an earth retaining method, and more particularly, to an earth retaining method which does not require a separate work method and is economical because it has a small amount of excavated soil to be drilled during ground penetration and has excellent excavating soil discharging and high strength characteristics excellent in crack bending moment, destructive force moment, And an earth retaining system for the same.

Generally, various construction methods are applied to construction sites in Korea.

In the case of deep underground excavation, continuous in-situ pile method (CIP) is often used. The CIP method is a method in which concrete piles are poured in the field by bringing assembled reinforcing bars or steel into the ground after excavation. And it is possible to minimize the influence of the ground deformation and adjacent buildings and it is possible to construct without being restricted by the ground conditions. As a result, it is used in construction sites of underground structures in many urban areas.

On the other hand, there is a disadvantage that it is difficult to obtain homogeneous quality because the construction cost is high due to the burial of C.I.P. steel, and since it is a cast-in-place pile, a retention method using PHC-W pile (Prestressed High Concrete-Wall) has been developed. As shown in FIG. 1, a typical PHC-W pile has a structure in which a plurality of steel wires 20 are arranged at regular intervals along a periphery of a hollow concrete body 10. It is known that the retained wall using PHC-W pile is advantageous for securing stability due to its excellent wall stiffness and it is possible to obtain homogeneous quality by using finished products and it is economical because it does not use H-shaped steel.

However, despite the high stiffness of the circular PHC pile in the case of the retained wall with circular PHC piles, it is necessary to use a separate ancillary method in the ground where the ground water is present. Since the pile is formed in a circular shape, There was a disadvantage in construction.

In addition, there is room for improvement in the crack bending moment, breaking force moment, and shear strength performance, which act in the fore and aft direction rather than in the left and right direction.

Korean Patent Publication No. 2005-0079439 (Aug. 10, 2005)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and a method for measuring a crack bending moment, And also to provide an earth retaining system for the same.

In order to achieve the above object, the earth retaining method according to the technical idea of the present invention is a retention method for constructing an earth retaining wall by constructing a PHC-W pile in a row in left and right directions, Bore each other so as to have a partially overlapped portion between neighboring perforation holes; Leaving at least a portion of the soil generated during drilling as it is in the perforation hole; Preparing a ground improvement soil to fill the inside of the pore hole by deep mixing by mixing cement into the pore hole and mixing with the soil generated during pore formation and stirring; The PHC-W piles are inserted into the respective perforation holes in a state in which the soil improved pits are filling the perforated holes, and the adjacent PHC-W piles are spaced apart from each other so as to fill the spaced- And a step of performing a predetermined operation.

In this case, the PHC-W pile is deformed into a cylindrical shape having a hollow shape, and the front and rear surfaces are formed in a plane, and the left and right sides of the PHC-W pile are concave curved surfaces corresponding to the other side formed with convex curved surfaces And the PHC-W pile is formed so as to maintain the spacing without overlapping with the other side of the adjacent PHC-W pile.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, the method comprising: drilling the ground in a line to form a perforation hole, the perforation hole being partially pierced so as to partially overlap the perforation holes; The PHC-W pile is deformed into a cylindrical shape having a hollow shape, the front and rear surfaces are formed in a plane shape, and the left side surface And a PHC-W pile formed to have a concave curved surface corresponding to the other side of the right side surface formed with a convex curved surface so as to maintain the spacing without overlapping with the other side of the adjacent PHC-W pile, A grout injection pipe is sandwiched between at least one of a front surface formed of a PHC-W pile and an inner wall of the perforation hole and a rear surface formed of a plane of the PHC-W pile, W to support the pile; And injecting grout into the perforation hole through the grout injection tube.

Further, the steel wires arranged along the circumference of the PHC-W pile body may be more concentrated in the front and rear portions than in the left and the post.

In addition, one steel wire is disposed on the left side and the postal side of the PHC-W pile main body, and all the remaining steel wires are divided and disposed on the front and back sides of the PHC-W pile main body. The disposed steel wires may be arranged at intervals of 20 degrees at an angle between adjacent ones of the PHC-W pile main bodies with the center of the PHC-W pile body as a center point.

Further, a step of installing an index member interposed between the concave one side of the adjacent PHC-W piles and the other convex side surface to block penetration of the groundwater is further provided so that the ground improvement And the exponent member includes a pair of first protrusions on the opposite convex sides of the PHC-W pile and spaced from each other in the forward and backward directions, and a pair of first protrusions, And a body portion of an X-shaped cross section having a pair of second protrusions which are spaced apart from each other in the front-rear direction on a concave side surface of the pile, so that the multi-order structure is possible, and the convex other side of the PHC- The gap between the pair of first projections is wider than the gap between the pair of second projections pressed on the concave side surface of the PHC-W pile to provide stable support, The body of the member is made of a water-swellable material, and when the groundwater is absorbed, the first protrusions and the second protrusions are more strongly pressed against the PHC-W pile while expanding, The casing may further include a casing for covering an outer side of the remaining portion except the end of each of the two protrusions, thereby preventing warpage due to expansion of the body.

Further, a step of installing an index member interposed between the concave one side of the adjacent PHC-W piles and the other convex side surface to block penetration of the groundwater is further provided so that the ground improvement The index member is symmetrically formed around the central portion of the body, and has an outer container portion, an inner container portion, and a membrane body portion at both ends, respectively, so that the recessed portion of the PHC-W peg And the outer container portion is formed in a shape of a rectangular parallelepiped shape along the circumference of the side of the main body center portion, The side end portion is in contact with the surface of the PHC-W pile while having a rectangular container shape with its side opened and extending outwardly so as to have a wide width, The container inner container portion has a container shape of a rectangular shape having a side end portion equal to or shorter than the side end portion of the outer container portion surrounded by the outer container portion and having a side opened and being in contact with the surface of the PHC- And the film body portion supports the inner container portion with respect to the body center portion by connecting the side end portion of the body center portion and the outer surface of the inner container portion, wherein the portion adjacent to the body center portion is relatively thin And the inner container portion is formed to be gradually thicker than the inner container portion. When the inner container portion receives a load in the direction of the center of the main body, the film body portion warps into a convex circular arc shape to allow displacement of the inner container portion, When the load acting on the inner container portion disappears, the elastic restoring force of the film body portion causes the inner side So that the base is returned to the initial position it may be characterized.

Meanwhile, the earth retaining system according to the present invention is a retention system for an earth retaining method for constructing an earth retaining wall. The earth retaining system is deformed into a shape cut in a cylindrical shape having a hollow, and has a front surface and a rear surface formed in a plane, A main body which is formed as a concave curved surface corresponding to the other side surface formed by the convex curved surface so as to be able to maintain the spacing without overlapping even if it is adjacent to the left and right sides of the main body and a plurality of the main body parts are arranged along the periphery of the main body, And a PHC-W pile which is formed of steel wires concentrically arranged in a larger number in the longitudinal direction and which can form an earth retaining wall when disposed side by side.

Also, there is provided a laminated perforation hole ground which is provided with a perforation hole formed in a row by ground penetration so as to have a partially overlapping portion, and the PHC-W pile is inserted in a soft manner. The soil and cement generated due to the ground penetration in the perforation hole of the overlaid perforation hole ground are immediately mixed and stirred to be prepared by the deep mixing process so as to be filled in the spacing space between the PHC-W pile And a soil improvement soil.

According to the present invention, there is no need for additional drilling during drilling, and it is economical because the amount of drilling soil is small in the drilling of the ground, and the crack bending moment, fracture strength moment, shear strength performance It has the advantage of being excellent.

In addition, the present invention can prevent the co-settlement and lateral flow of adjacent grounds, which may occur during the embankment on soft ground, by installing the PHC-W, and secure the slope stability by acting as a constraining pile when installed on the slope.

 Further, in the present invention, the PHC-W piles may be arranged in a row so as to support the earth pressure to form a self-sustaining type column to form a permanent retaining wall which can resist the earth pressure.

1 is a plan view of a PHC-W pile used in a retaining method according to the prior art;
FIG. 2 is a plan view for explaining the construction of the earth retaining system for the earth retaining method according to the embodiment of the present invention.
3 is a perspective view of the PHC-W pile in the earth retaining system according to the embodiment of the present invention.
4 is a view for explaining the effect of improving the strength of the PHC-W pile in the earth retaining system for the earth retaining method according to the embodiment of the present invention.
FIG. 5 is a plan view of an index member in an earth retaining system for an earth retaining method according to an embodiment of the present invention.
6 is a cross-sectional view for explaining the construction of an index member in the earth retaining system for the earth retaining method according to the embodiment of the present invention.
7 to 9 are a series of reference drawings for explaining an earth retaining method according to an embodiment of the present invention.
10 is a plan view of the earth retaining system according to a modified embodiment of the present invention
11 is a sectional view for explaining a configuration of a straight section type index member modified in the earth retaining system according to a modified embodiment of the present invention
12 is a view for explaining the action and operation of the linear member in the earth retaining system according to the modified embodiment of the present invention;
13 and 14 are plan views for explaining the construction of the earth retaining system according to still another modified embodiment of the present invention

The earth retaining method and the earth retaining system according to the embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention, and are actually shown in a smaller scale than the actual dimensions in order to understand the schematic structure.

Also, the terms first and second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

3 is a perspective view of the PHC-W pile in the earth retaining system according to the embodiment of the present invention, and FIG. 4 is a perspective view of the soil retaining system according to the present invention. FIG. 5 is a plan view of the soil member in the soil retaining system according to the embodiment of the present invention. FIG. 5 is a plan view of the soil member in the soil retaining system according to the embodiment of the present invention. And FIG. 6 is a cross-sectional view for explaining the construction of the index member in the earth retaining system for the earth retaining method according to the embodiment of the present invention. 7 to 9 are a series of reference views for explaining an earth retaining method according to an embodiment of the present invention.

2, the soil retaining system for performing the earth retaining method according to an embodiment of the present invention includes a PHC-W pile 110, an overlapping perforation hole ground T0, a ground improvement soil M1, and an index member 120, .

The PHC-W pile 110 comprises a deformed pile body 111 as shown in FIGS. 2 and 3, and a deformed steel wire 112.

The pile body 111 has a hollow 111A at the center and has a front surface and a rear surface formed as a plane 111D and has a concave curved surface 111C corresponding to the other surface formed by a curved surface 111C, (111B). The PHC-W piles 110 are arranged adjacent to each other in the left-right direction to prevent the overlapping portions of the pile main body 111 from being overlapped with each other. So that the earth retaining wall can be realized.

A plurality of steel wires 112 are arranged along the circumference of the pile body 111, and the number of the steel wires 112 is more concentrated on the front and rear portions where loads are concentrated as compared with the left and right postcards. As a result, it is possible to more effectively resist horizontal loads (earth pressure, water pressure, road load, overhead load, etc.) concentrated in the fore-and-aft direction rather than in the lateral direction as shown in Fig. To this end, only one steel wire 112 is disposed on the left and right sides of the pile body 111, and all the remaining steel wires 112 are concentrically disposed on the front and rear portions of the pile main body 111. At this time, as shown in FIG. 2, the steel wires 112 disposed on the front and rear portions of the pile main body 111 are arranged so as to be spaced at angles of 20 degrees from each other with the center of the pile main body 111 as a center point do.

In the case of the above PHC-W pile 110, as a result of the self test, the crack bending moment (about 40% to 70%) is compared with the existing PHC-W pile 110 (Φ500) KS quality standard (KS F4306) % Improvement), fracture bending moment (about 30% ~ 70% improvement), and shear strength (about 200% improvement). This is summarized in Table 1 below. For reference, in Table 1, the circular PHC pile 110 is a product of the KS quality standard (KS F4306) in which nine steel wires 112 having a diameter of 9.2 mm are disposed, and the A type and the B type, (112) are differentiated into? 9.2 mm and? 11.0 mm, respectively.

Existing PHC piles (Φ500)
KS quality standard
(KS F4306) Optimum steel wire placement
PHC-W piles
(A Type, representative experimental value) Optimum steel wire placement
PHC-W piles
(B Type, typical experimental value) Crack bending moment (kN · m) 103.0 145.8 178.3 Breaking bending moment (kN · m) 155.0 199.6 289.0 Shear strength (kN) 228.6 391.3 391.3

The piled perforation hole ground T0 has a perforation hole T1 formed in a line in the left and right direction by ground penetration so as to have an overlapping portion T2 so that the PHC-W pile 110 is opened Respectively.

The soil improvement mortar M1 is manufactured by deep mixing treatment in which the soil and cement generated due to the ground penetration are mixed and stirred in the perforation hole T1 of the overlapped perforation hole T0, W piles 110 in a state filled with the PHC-W piles 110. The ground improvement mats M1 serve to block the groundwater while filling the space between the PHC-W piles 110. The ground improvement mats M1 are used to cut the cement from the groundwater generated in the ground through the perforation hole T1 Lt; RTI ID = 0.0 > mixing < / RTI > In the case of such deep mixing process, the FILE DRIVE is carried out by mixing and stirring the soil and cement at the same time and at the same time with the ground penetration. The cement is injected into the first shaft, the air is injected into the second shaft, Can be carried out more quickly by the method of injecting. After the deep mixing process, the PHC-W pile 110 is inserted into each perforation hole T1 to form a continuous-column type earthen wall.

According to the configuration in which the overlapped perforation hole ground T0 and the ground improvement soil M1 are combined, it is possible to overlap the PHC-W piles 110 and to provide a separate index device So that it is possible to effectively take care of it. In addition, there is an advantage that the amount of excavated soil generated due to the ground penetration can be reduced.

The index member 120 is used for securing a more stable multi-order performance by adding an additional order function to the ground improvement soil M 1 filled in the spacing space between the PHC-W piles 110. Further, the index member 120 serves as a spacer so that the PHC-W piles 110 can be maintained at an accurate distance without being pushed to one side. 9, the index member 120 is sandwiched between one side formed by the concave curved surface 111C of the neighboring PHC-W pile 110 and the other side formed by the convex curved surface 111B, And is formed long in the vertical direction by the length of the PHC-W pile 110. As shown in FIGS. 5 and 6, the index member 120 is provided with a pair of spaced apart front and rear portions on the other side of the convex curved surface 111B of the PHC-W pile 110, A pair of second protrusions 121C and 121D are provided on one side of the first protrusions 121A and 121B and the concave curved surface 111C of the PHC-W pile 110 and spaced apart from each other in the front- And a body portion 121 having an X-shaped cross-section. The index member 120 may be formed as long as a gap between a pair of first protrusions 121A and 121B pressed on the other convex surface of the PHC-W pile 110 is pressed on a concave side surface of the PHC-W pile 110 The gap between the pair of second projections 121C and 121D is wider than the gap between the pair of second projections 121C and 121D.

The body portion 121 of the index member 120 may be made of a general rubber elastic material, but it is preferably made of a water expanding material such as bentonite or rubber having a water inflating material. The first and second protrusions 121A and 121B and the second protrusions 121C and 121D can be more strongly pressed against the PHC-W pile 110 while the exponent member 120 absorbs groundwater . When the body portion 121 of the index member 120 is made of a water expanding material, the end portions of the first and second projections 121A and 121B and the second projections 121C and 121D are removed from the body portion 121 And a casing part 122 covering the outer side of the first protrusions 121A and 121B and the second protrusions 121C and 121D to prevent twisting of the first protrusions 121A and 121B and the second protrusions 121C and 121D due to the expansion of the body part 121. [ . As shown in FIG. 5, a large number of groundwater absorption holes 122A are formed in the casing 122. At each end of the casing portion 122, a cap portion CA for supporting each end of the body portion 121 pressed against the PHC-W pile 110 is extended. The cap CA assists the first protrusion and the second protrusion end of the body part 121 to make strong contact with the PHC-W pile 110 without bending.

Hereinafter, an earth retaining method for constructing an earth retaining wall using the earth retaining system of the present invention having the above-described configuration will be described.

In the retaining method according to the embodiment of the present invention, as shown in FIG. 7, the ground is perforated in a line in the left-right direction to form a perforation hole T 1, and a plurality of perforated holes T 1 And then performing a drilling step. Thereby forming an overlapping perforation hole ground T0 having a perforation hole T1 formed so as to have an overlapping portion T2.

Thereafter, only a part of the soil generated from the pierced ground is discharged from the perforated hole T1 and the remainder is left in the perforated hole T1, and cement is injected into the perforated hole T1, The ground improvement soil M1 filling the perforation hole T1 is formed through a deep mixing process in which the soil is immediately mixed and agitated. In the deep mixing process, the cement is injected into the first shaft, air is injected into the second shaft, and the third shaft is filled with the cement, and the FILE DRIVE is mixed with the soil and the cement at a low pressure So that it proceeds quickly.

8, the PHC-W piles 110 are inserted into the perforation holes T1 in a state in which the soil improvement trowel M1 is filling the perforation hole T1, To form the earth retaining wall. At this time, spacing is generated between the adjacent PHC-W piles 110 unless the pile is deflected to one side, and the spacing space is filled with the ground improvement soil M1. The PHC-W pile 110 inserted in the perforation hole T1 has a front surface and a rear surface in a plane 111D as described above, and a convex curved surface 111C and a right curved surface 111C, And the main body 111 formed by the concave curved surface 111B. The steel wire 112 is more concentratedly arranged on the front and back sides than the left side and the post side, so that the load acting in the forward and backward direction can be stably obtained.

Then, as shown in FIG. 9, the process of installing the index member 120 between the concave one side surface and the convex other side surface of the PHC-W pile 110 adjacent to each other is proceeded. At this time, the PHC-W piles 110 are strongly pressed downward with respect to the exponent member 120 so as to intervene between neighboring PHC-W piles 110. When the index member 120 is installed up to the index member 120, the ground improvement soil M1 and the index member 120, which are already filled between the neighboring PHC-W piles 110, To maintain the spacing between PHC-W piles 110 at a constant level while still acting as spacers.

[0030] The earth retaining system according to a modified embodiment of the present invention will be described below.

FIG. 10 is a plan view of the earth retaining system according to a modified embodiment of the present invention, FIG. 11 is a sectional view for explaining the configuration of a straight member of a straight section modified in the earth retaining system according to a modified embodiment of the present invention, FIG. 8 is a reference diagram for explaining the operation and operation of the deformed straight member in the earth retaining system according to the modified embodiment of the present invention. FIG.

As shown in the figure, in the retention system according to the modified embodiment of the present invention, the straight section type index member 130 is deformed in the X-shaped cross-sectional shape index member 130 as compared with before the deformation. Although the flat cross section type exponential member 130 is formed as a straight cross section, the cross sectional shape of the cross sectional shape of the cross sectional shape of the cross sectional shape member 130 And has a unique configuration in which a dual order is possible.

The straight section type index member 120 is provided with an outer container portion 132, an inner container portion 133 and a film body portion 134 at both ends symmetrically symmetrical with respect to the body center portion 131, The convex curved surface 111B and the convex curved surface 111B, respectively.

More specifically, the body center portion 131 is formed in a rectangular container shape having long sides at both side ends thereof. The outer container portion 132 has a rectangular container shape with its side opened to have a wider width along the side end portion of the main body center portion 131 and has a side end portion extending outwardly from the PHC-W pile 110 And the inner container portion 133 is formed such that the side end portion at the center of the inner space surrounded by the outer container portion 132 is equal to or shorter than the side end portion of the outer container portion 132 W side of the PHC-W pile 110 while having a rectangular container shape with an open side. The membrane body portion 134 is formed by connecting the side end portion of the body center portion 131 with the outer surface of the inner container portion 133 to connect the body center portion 131 to the body center portion 131. [ The inner container portion 133 has a relatively thin thickness at portions adjacent to the central portion 131 of the inner container 133 in the circumferential direction and has a thickness gradually increasing to the outer surface of the inner container portion 133 do. The outer container portion 132 and the inner container portion 133 simultaneously contact the surface of the PHC-W pile 110 to perform multiple order functions according to the configuration of the membrane portion 134, (OB), such as gravel, penetrates into the middle. For example, FIG. 12 shows a case where the foreign object OB enters the inside of the outer container portion 132. At this time, the film body portion 124 is bent in a convex circular arc shape to allow displacement of the inner container portion 133, 133 disappear, the inner container portion 133 is returned to the initial position by the elastic restoring force. On the other hand, when the foreign matter OB is interposed in the outer container portion 132, the inner container portion 133 contacts the surface of the PHC-W pile 110 and the outer container portion 132 and the inner container portion 133, At least one of which can maintain contact with the surface of the PHC-W pile 110 to perform a continuous order function.

The outer container portion 132 includes an outer horizontal portion 132a and an outer vertical portion 132b which are sequentially extended from the body center portion 131 so as to be formed into a container shape having a rectangular cross section. In the case of the inner container portion 133, the inner horizontal portion 133a and the inner vertical portion 133b are formed. The inner vertical portion 133b of the inner container portion 133 is formed with the inner space of the outer container portion 132 and the flow grooves 133b-1 for air circulation. In the case of the membrane body part 154, the first connection part 134a connected to the body center part 131 by a relatively thin thickness and rotatably connected to the inner vessel part 133 is connected to the inner vessel part 133, And a second connecting portion 134b formed to have a thick thickness.

13 and 14 are plan views for explaining the construction of the earth retaining system according to still another modified embodiment of the present invention.

As shown in the drawings, the earth retaining system according to another modified embodiment of the present invention is further provided with a grout injection pipe (GP) for injecting grout in place of the ground improvement soil.

13 and 14, between the inner wall of the perforation hole T1 and the front surface formed by the plane of the PHC-W pile 110 in the case of the grout injection pipe GP, And between the inner wall of the PHC-W pile 110 and the rear surface formed by the plane 111D of the PHC-W pile 110. According to this method, the grout injection pipe GP helps the PHC-W pile 110 to be stably supported in the perforation hole T1.

13, the grout injection pipe GP is installed on both the front and rear sides of the PHC-W pile 110, and in the case of FIG. 14, the grout injection pipe GP is connected to the front surface of the PHC- It is installed in one of the rear side. As shown in FIG. 13, when the grout injection pipe GP is installed, it is possible to more stably support the PHC-W pile 110 than when the grout injection pipe GP is installed as shown in FIG. 14, The PHC-W pile 110 can be stably supported even when the grout injection pipe GP is installed.

After the grout injection pipe GP is installed, the grout is injected into the perforation hole T1 through the grout injection pipe GP to fix the PHC-W pile 110, Can be completed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

110: PHC-W pile 111: Pile body
112: Steel wire 120: Index member
121: body portion 122: casing portion
T0: Overlapped perforated hole ground M1: Ground improvement soil

Claims (13)

As a pultrusion method for constructing an earth retaining wall by constructing a PHC-W (Prestressed High Concrete-Wall) pile in a row in left and right directions,
Piercing the ground in a line to form a perforation hole, wherein the perforation holes are partially pierced to each other so as to partially overlap the adjacent perforation holes; Leaving at least a portion of the soil generated during drilling as it is in the perforation hole; Preparing a ground improvement soil to fill the inside of the pore hole by deep mixing by mixing cement into the pore hole and mixing with the soil generated during pore formation and stirring; And the PHC-W pile is inserted into each of the perforation holes in a state in which the ground improvement soil is filling the perforation hole, and the adjacent PHC-W piles are spaced apart to fill the spacing space with the ground improvement soil ; ≪ / RTI >
The PHC-W pile is cut into a cylindrical shape having a hollow shape. The PHC-W pile is formed in a planar shape with a front surface and a rear surface. The PHC-W pile is formed of a concave curved surface corresponding to the other surface formed with a convex curved surface, -W piles are provided to keep the spacing without overlapping with the other side of the adjacent PHC-W pile,
Further comprising the step of inserting an index member interposed between the concave one side surface of the adjacent PHC-W pile and the convex other side surface to block penetration of groundwater, so that between the neighboring PHC-W piles, The double degree by the exponential member is achieved,
The exponent member includes a pair of first protrusions, each of which is spaced apart from the convex surface of the PHC-W pile and spaced apart in the front-rear direction, and a pair of second protrusions spaced apart from each other in the front- And a pair of first projections spaced apart from each other on the convex other side of the PHC-W pile, the PHC-W pile having a pair of second protrusions, And the body of the exponent member is made of a water expanding material and expands when the groundwater is absorbed, so that the PHC-W pile 1, the pressing of the protruding portion and the second protruding portion becomes stronger,
The exponent member may further include a casing portion that covers the outer sides of the first and second protrusions except the end portions of the first and second protrusions with respect to the body portion to prevent warpage due to expansion of the body portion. . delete delete The method according to claim 1,
Wherein the steel wire disposed along the circumference of the PHC-W pile body is more concentrated in the front and rear portions than in the left side and the postal side. 5. The method of claim 4,
One strand is disposed on the left side of the PHC-W pile body, and all the other strands are disposed on the front and rear sides of the PHC-W pile main body.
Wherein the PHC-W pile body is disposed at an interval of an angle of 20 degrees between neighboring ones of the PHC-W pile main body, with the center of the PHC-W pile body as a center point. delete delete A retention system for an earth retaining method for constructing an earth retaining wall,
The front surface and the rear surface are formed in a plane shape, and the left side surface and the right side surface are formed as concave curved surfaces corresponding to the other side formed by convex curved surfaces, so that even if they are adjacent to the left side and the postal side, And a plurality of steel wires arranged concentrically on the front and rear portions of the main body in comparison with the left side and the rear side of the main body. When the side walls are arranged side by side, they form a retaining wall A PHC-W pile;
An overlapped perforation hole ground which has a perforation hole formed in series by ground penetration so as to have a partially overlapping portion and inserted into the PHC-W pile; And
The soil and cement generated due to the ground penetration in the perforation hole of the overlaid perforation hole ground are immediately mixed and stirred to be prepared by the deep mixing process so as to be filled in the spacing space between the PHC-W pile Soil improvement soil,
Further comprising an index member interposed between a concave one side of the adjacent PHC-W pile and the other convex side surface to block penetration of the groundwater,
The exponent member includes a pair of first protrusions, each of which is spaced apart from the convex surface of the PHC-W pile and spaced apart in the front-rear direction, and a pair of second protrusions spaced apart from each other in the front- And a pair of first projections spaced apart from each other on the convex other side of the PHC-W pile, the PHC-W pile having a pair of second protrusions, And the body of the exponent member is made of a water expanding material and expands when the groundwater is absorbed, so that the PHC-W pile 1, the pressing of the protruding portion and the second protruding portion becomes stronger,
The exponent member may further include a casing for covering an outer side of the first and second protrusions with respect to the body except for the end of each of the first and second protrusions so as to prevent the body from being distorted due to expansion of the body. The earth retaining system. 9. The method of claim 8,
One steel wire is disposed on the left side of the PHC-W pile body and all the other steel wires are disposed on the front and back sides of the PHC-W pile body in an even number,
Wherein the PHC-W pile body is disposed at an interval of an angle of 20 degrees with respect to the center of the body of the PHC-W pile body. delete delete 9. The method of claim 8,
A plurality of groundwater absorption holes are formed in the casing portion of the exponent member so as to smoothly absorb groundwater in the body portion,
Wherein each of the end portions of the casing portion is formed with a cap portion for supporting the end portion of the body portion to be pressed against the PHC-W pile so as not to be bent. delete

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