KR101568982B1 - Shutting off water method of hole on sheet pile - Google Patents

Abstract

The present invention relates to a method for reinforcing an order of a cable passage hole formed in a seat pile, which can prevent groundwater or the like from being introduced through a cable passage hole when an earth anchor or the like is installed on a seat pile, .
The method for reinforcing a cable passage hole number may include: a) forming a cable passage hole in the seat pile; b) a male thread welding step of welding a plurality of male threads around the cable passing hole; c) installing a cable projecting outwardly of the sheet pile through the cable passage hole; d) applying a waterproofing material to the front portion of the cable through hole of the cable, the waterproofing material applying the adhesive waterproofing material; e) attaching an elastic plate having a center hole at a position coinciding with the cable and having a male screw hole at a position coinciding with the male screw, to the sheet pile; f) a pressing steel plate having a center hole formed at a position coinciding with the cable and having a male screw hole at a position coinciding with the male screw is positioned on the upper surface of the elastic plate, and a nut is fastened to the male screw, The method comprising the steps of:

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a method for reinforcing a cable passage hole when forming a cable passage hole in a seat pile constituting an earth retaining wall for installing an earth anchor and the like, and more particularly, The present invention relates to a method for reinforcing the degree of a cable passage hole formed in a seat pile that can prevent groundwater or the like from being introduced through a cable passage hole when an earth anchor or the like is installed on a seat file having a seat pile.

When constructing an underground structure, earthworks must be done to prevent the surface of the earth from collapsing. The concrete structure is determined depending on the soil, the shape of the ground, the groundwater level, the scale of the construction, and the surrounding environment where the underground structure is constructed. If the underground structure is constructed in a place with a high groundwater level, It should have a structure that can function not only as a support but also as an order.

Accordingly, the present applicant has filed and filed a registration application for the " compound river type facility and its construction method " in Registration No. 10-1117924. FIG. 1 shows a conventional method of constructing a hybrid type river system according to the prior art.

The construction of the composite type steel girder facility according to the prior art is performed by: i) installing the first and second sheet piles 210 and 310 (Fig. 1 (a)); Ii) the step of installing the stanchion 200 (Fig. 1 (b)); Iii) filling of the filler S 'and forming of the support wall 220 (Fig. 1 (c)); Iv) drainage and cullet steps (Figures 1 (d) and 1 (e)); V) installation of the water wall 270 (Fig. 1 (f)).

Even if the sheet-like sheet piles 210 and 310 which are advantageous to the order are not stuck to the hard supporting layer, the supporting structure constructed by the above-mentioned method supports the sheet pile by supporting the sheet pile 200 in a hard supporting layer, In addition, since the supporting wall 220 is formed by grouting around the lower end of the sheet file before excavating the gravel, groundwater or the like does not enter into the work space even during the construction of the river facility. However, in the case where an earth anchor or the like is installed to enhance the earth pressure holding force of the above-mentioned river facility, a perforation hole is formed at a middle height of the sheet pile. Groundwater or the like continuously flows through the perforation hole, And it is troublesome to remove the influent water in the work space even after the earth anchor is installed.

In the "exponential pack for sheet file earth anchor" and the exponential method using the same, the registration number 10-1043966 shown in FIG. 2, in the case of installing the earth anchor through the sheet file, And the like.

In the conventional technique, the cylindrical sleeve 10 is welded to the periphery of the through hole 1a, and the packing 21, the front and rear pressing plates 22 and 23, the pressing bolts 24, And the nut 25, and then the pressure bolts are tightened so that the front and rear pressing plates press the packing so that the packing and the inner surface of the sleeve are strongly adhered to each other.

Accordingly, since the exponential pack main body is inserted into the sleeve, it is necessary to manufacture the front and back pressure plates constituting the exponential pack main body to an accurate size, and an anchor It is not easy to insert the front and rear pressure plates into the slab. When the pressure bolt is not tightened, since the packing and the slab are not in close contact with each other, the position of the exponential pack main body 20 is not fixed It is not easy to tighten the pressure bolt. Further, when the packing of the elastic material is deteriorated over time due to the adhesion of the packing with the inner surface of the slab and the exponential pack body is fixed to the slab, the exponential performance is drastically deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to prevent groundwater or the like from entering through a cable passage hole formed in a sheet pile constituting an earth retaining wall for installing an earth anchor, And an object of the present invention is to provide a method of reinforcing a degree of a cable through hole formed in a sheet file which can absorb a construction error and can be easily installed.

According to a preferred embodiment of the present invention, there is provided a method for reinforcing a cable passage hole formed in a sheet pile constituting an earth retaining wall, comprising the steps of: a) forming a cable passage hole in the seat pile, A hole forming step; b) a male thread welding step of welding a plurality of male threads around the cable passing hole; c) installing a cable projecting outwardly of the sheet pile through the cable passage hole; d) applying a waterproofing material to the front portion of the cable through hole of the cable, the waterproofing material applying the adhesive waterproofing material; e) attaching an elastic plate having a center hole at a position coinciding with the cable and having a male screw hole at a position coinciding with the male screw, to the sheet pile; f) a pressing steel plate having a center hole formed at a position coinciding with the cable and having a male screw hole at a position coinciding with the male screw is positioned on the upper surface of the elastic plate, and a nut is fastened to the male screw, The method of reinforcing an order of a cable through hole formed in a sheet pile is provided.

According to another embodiment of the present invention, there is provided a method for reinforcing a cable passage hole formed in a sheet pile constituting a earth retaining wall, comprising the steps of: a) forming a cable passage hole in the seat pile; b) installing a cable projecting outwardly of the seat pile through the cable passage hole; c) applying a waterproofing material to the front portion of the cable through hole of the cable, the adhesive waterproofing material being applied; d) attaching an elastic plate having a center hole at a position coinciding with the cable to the sheet pile; and e) a pressing steel plate joining step of pressing a press sheet to a sheet pile after positioning a pressurized steel sheet having a central hole at a position coinciding with the cable and having a larger area than the elastic sheet, on the upper surface of the elastic sheet The number of the through holes of the cable passing hole is increased.

According to another embodiment of the present invention, the step of installing the cable includes the steps of forming a perforation hole by perforating the outer side ground of the sheet pile through the cable passing hole, inserting a cable into the perforation hole, And forming a bulb by grouting the sheet through hole in the sheet pile.

According to another embodiment of the present invention, the earth retaining wall further comprises an outer sheet file formed outside the sheet pile and spaced apart from the sheet pile; The cable installation step includes the steps of forming a cable through hole in the outer sheet file, a cable as a tie cable for maintaining a gap between the seat file and the outer sheet file through the cable passage hole of the seat file, And a step of fixing the cable to the outer surface of the outer sheet file. The method of reinforcing the degree of the cable through hole formed in the sheet pile is provided.

According to another embodiment of the present invention, there is provided a method of reinforcing the degree of the cable passage hole formed in the seat pile, wherein a pressing rib is formed around a center hole of a surface of the pressing steel plate contacting the elastic plate.

According to another embodiment of the present invention, the pressing iron plate comprises a central member having a center hole and a peripheral member having an opening formed at a position of the central member, the rim of the central member being formed to overlap with the peripheral member, The pressing steel plate joining step comprises joining the peripheral members to cover the elastic plate, and then joining the central member to the upper surface of the peripheral member by welding.

The method of reinforcing a cable passage hole according to the present invention can prevent groundwater or the like from entering through a cable passage hole formed in a sheet pile when an earth anchor is installed on the earth retaining wall or when a tie cable is installed, The construction can be prevented from being disturbed.

In addition, the members used in this method can be manufactured and used immediately in the field according to the situation of the site because it is easy to manufacture because no special machining is required other than forming the openings. Also, since the work of each step is simple and clear, It is easy to use the method.

The elastic plate serving as the waterproof plate in the course of the present method can be strongly pressed by the pressing steel plate only by tightening or welding the nut to the male thread and even if the elastic plate is deteriorated over time, Since the elastic plate is pressed, the water flowability can be maintained to some extent. The pressurized steel plate is formed with a pressurizing rib to press the periphery of the portion where the groundwater can be introduced more strongly. Even if an error occurs in the installation position of the cable, the pressurized steel plate is divided into the peripheral member and the central member, Allows to absorb errors.

FIG. 1 is an explanatory view of a 'hybrid steel girder facility and its construction method' as a prior art.
2 is an explanatory diagram of an 'exponential pack for a sheet file earth anchor and an exponent method using the exponential pack' as another related art.
FIGS. 3 and 4 are explanatory diagrams showing cases in which the degree-of-cable reinforcing method of the cable passing hole according to the present invention can be applied.
Fig. 5 is an explanatory view showing, in order, a first embodiment of a method of reinforcing a cable passage hole degree according to the present invention.
6 and 7 are explanatory diagrams showing a detailed process of a cable installation step in the present invention.
FIG. 8 is an explanatory diagram of a case where a pressurizing rib is formed on a pressurized steel plate used in a method for reinforcing a degree of a cable passage hole according to the present invention. FIG.
Fig. 9 is an explanatory view of a case where a press-rolled steel plate used in a method of reinforcing a cable through hole according to the present invention is composed of a peripheral member and a central member.
Fig. 10 is an explanatory view showing, in order, a second embodiment of the method of reinforcing a cable passage hole degree according to the present invention.
FIG. 11 is an explanatory view of a case in which an insertion groove is formed in the pressing steel plate. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, however, it is to be understood that the present invention is not limited to the disclosed embodiments.

The present invention is characterized in that when the earth retaining wall including the seat pile 30 is installed at a place with a high groundwater level and the cable passing hole H is formed in the seat pile 30, The present invention relates to a method for reinforcing a cable passage hole degree to prevent groundwater or the like from being introduced through the through hole.

As shown in FIG. 3, in order to reinforce the earth pressure holding force of the earth retaining wall 3, the tension member C is passed through the sheet pile 30 while the earth anchor 4 is being installed In order to increase the water repellency of the earth retaining wall 3 as shown in FIG. 4 or to form a double sheet file 30 as in the 'hybrid steel girder facility and its construction method' Can be applied to a case where an opening through which a tie cable can pass is formed in the seat pile (30) for installing a tie cable (C) for holding the spacing of the seat pile (30) have.

FIG. 5 shows a first embodiment of a method of reinforcing a cable passage hole degree according to the present invention in order.

A method of reinforcing a cable passage hole according to the first embodiment relates to a method of reinforcing a cable passage hole formed in a sheet pile 30 constituting an earth retaining wall body, ); Forming a cable through-hole; b) welding a plurality of male threads (40) around the cable through hole (H); c) installing a cable (C) protruding outside the sheet pile (30) through the cable through hole (H); d) applying a waterproofing material (50) to a front portion of the cable through hole (H) of the cable (C); e) An elastic plate 60 having a central hole 60a formed at a position coinciding with the cable C and having a male screw hole 60b formed at a position coinciding with the male screw 40 is inserted into the seat pile 30); f) a pressing iron plate 70 having a central hole 70a at a position coinciding with the cable C and having a male screw hole 70b formed at a position coinciding with the male screw 40, 60, and then the nut 80 is tightened to the male screw 40 to join the pressurized steel sheet.

Since the method of reinforcing the degree of the cable passage hole is applied to the inner surface of the seat pile 30 constituting the earth retaining wall, that is, the surface in contact with the space partitioned by the earth retaining wall body, the seat pile 30 is type There must be enough cullet to secure the work space.

Hereinafter, the method of reinforcing the cable passage hole number will be described step by step.

a) forming a cable passage hole (H) in the seat pile (30);

The cable passage hole H is formed in the seat pile 30 so that the cable C constituting the earth anchor or the tie cable can be positioned outside the earth retaining wall in the working space inside the earth retaining wall.

The cable passing hole H determines the size of the cable passing hole H in consideration of the number of the cable C passing through the cable passing hole H and the piercing operation of the ground outside the earth retaining wall.

b) welding a plurality of male threads (40) around the cable through hole (H);

The male screw 40 is welded around the cable passage hole H of the sheet pile 30 so that the elastic plate 60 and the press plate 70 can be joined to the sheet pile 30 in the subsequent steps.

5 (b) shows a state in which four male screws 40 are arranged at the vertexes of a quadrangle. However, when the pressing plate 70 is rotated while fixing the positions of the elastic plate 60 and the pressing plate 70 If the elastic plate 60 can be pressed sufficiently, the shape and number of the elastic plate 60 may be changed.

c) installing a cable (C) protruding outside the sheet pile (30) through the cable through hole (H);

The cable C is inserted through the cable passage hole H to the outside of the earth retaining wall and the opposite end of the inserted portion is protruded to the inside of the retaining wall by a length corresponding to the fixing of the cable C.

The number of cables C to be installed through the cable passage holes H differs depending on whether the cable C is for an earth anchor or a tie cable and the size of a load to be supported by the cable C .

The detailed process of this step is different depending on whether the cable C is for an earth anchor or for a tie cable, and detailed processes of this step are shown in FIGS.

6, detailed steps of the cable installation step are shown in order when the method of reinforcing the order of the cable through holes according to the present invention is applied to the construction of the earth anchor.

The detailed process includes the steps of i) drilling the outer ground of the sheet pile 30 through the cable through hole H to form the perforation hole D, ii) inserting the cable C into the perforation hole D, And iii) forming a bulb (R) by grouting in the perforation hole (D).

Through the above processes, the cable C is firmly fixed in the ground outside the earth retaining wall. After the completion of the method of reinforcing the cable through holes according to the present invention, the earth (C) is tensioned and fixed on the inner side of the wall to improve the earth pressure holding force of the earth retaining wall.

Fig. 7 shows, in order, the detailed steps of this cable installation step when the method of reinforcing the order of the cable through holes according to the present invention is applied to the construction of the tie cable. As described above, the tie cable is installed so that the sheet piles 30 arranged in a double manner can maintain the spacing without being opened by the loads and work loads of the soil, ground water, etc. filled therebetween. The sheet file located in the outer sheet file 30 'will be referred to as an' outer sheet file 30 '.

The detailed process includes the steps of: i) forming a cable passage hole H 'in the outer sheet file 30', ii) forming a sheet passing hole H 'through the cable passage hole H of the sheet file 30, (Iii) inserting the cable (C) as a tie cable to maintain the gap between the outer sheet file (30 ') and the outer sheet file (30' And fixing the cable (C) to the outer surface.

After the completion of the method for reinforcing the cable through holes according to the present invention, the other end of the cable C is fixed to the seat pile 30, that is, the end portion of the seat pile 30 ' So that the spacing between the sheet files 30 and 30 'is maintained.

As shown in FIG. 7 (b), one cable T as a normal tie cable is provided for each cable through hole H.

d) applying a waterproofing material (50) to a front portion of the cable through hole (H) of the cable (C);

The position where the elastic plate 60 is passed through the elastic plate 60 when the elastic plate 60 is attached to the sheet pile 30 in the immediately preceding position of the cable passage hole H on the length of the cable C, The adhesive waterproofing material 50 is applied.

The viscous waterproofing material 50 allows the sheet pile 30 to have a tight structure with respect to groundwater or the like that can be introduced through the cable passage hole H together with the elastic plate 60.

As the adhesive waterproofing material 50, silicon, epoxy, or the like may be used.

e) An elastic plate 60 having a central hole 60a formed at a position coinciding with the cable C and having a male screw hole 60b formed at a position coinciding with the male screw 40 is inserted into the seat pile 30);

An elastic plate 60 covering the cable passage hole H formed in the seat pile 30 is attached to the seat pile 30 to prevent groundwater or the like from flowing through the cable passage hole H. [

The elastic plate 60 is formed with a male screw hole 60b at a position corresponding to the male screw 40 so that the position of the elastic plate 60 is fixed and the cable C is fixed at a position coinciding with the cable C. [ And the elastic plate 60 can be installed without interfering with the cable C. As shown in FIG.

It is preferable that the center hole 60a is formed to have the same diameter as the diameter of the cable C, but it is not easy to accurately process the diameter of the center hole 60a, The center hole 60a is formed to have a diameter larger than the diameter of the cable C because it is not easy to provide the elastic plate 60 when the diameter of the center hole 60a is the same. The adhesive waterproofing material 50 applied to the cable C in step d) enters the gap formed between the inner side surface of the center hole 60a and the outer side surface of the cable C so that the ground water or the like flows through the gap It prevents. In this step, it is preferable that the adhesive waterproofing material 50 applied in step d) is advanced before curing.

The elastic plate 60 is formed of an elastic material such as rubber and is pressed against the sheet pile 30 by the pressing iron plate 70 installed at a subsequent stage.

f) a pressing iron plate 70 having a central hole 70a at a position coinciding with the cable C and having a male screw hole 70b formed at a position coinciding with the male screw 40, 60, and then tightening the nut (80) to the male screw (40), thereby joining the pressed steel sheet to each other;

The pressing plate 70 presses the elastic plate 60 so that the elastic plate 60 is brought into close contact with the sheet pile 30 so that the ground water can be prevented from flowing through the cable passage hole H. [

The pressing iron plate 70 is provided with a male screw hole 70b at a position coinciding with the male screw 40 as in the case of the elastic plate 60 so that the pressing steel plate 70 can be joined, A central hole 70a is formed at a matching position and the pressurized steel plate 70 can be installed without interfering with the cable C. [

Since the elastic plate 60 is in close contact with the sheet pile 30 by the pressing steel plate 70 as described above, even if the elastic plate 60 deteriorates with time, the pressing force of the pressing steel plate 70 can be maintained The water repellency of the elastic plate 60 does not drop sharply.

A pressing rib 71 may be formed around the center hole 70a of the pressing plate 70 in contact with the elastic plate 60. 8 is a perspective view showing a case where a pressing rib 71 having a shape surrounding the center hole 70a is formed in the press iron plate 70. As shown in Fig.

The pressing rib 71 strongly protrudes on the surface of the pressing iron plate 70 and strongly presses the peripheral portion of the center hole 60a of the elastic plate 60 into which the ground water or the like can flow so that the sheet pile 30 and the elastic plate 60 It prevents the ground water from escaping into the gap between each side of the ground. The pressing rib 71 may be formed not only around the center hole 70a of the pressing iron plate 70 but also at the rim of the pressing iron plate 70 so as to reinforce the plate iron plate 70.

The pressing iron plate 70 is composed of a central member 70C having a center hole 70a and a peripheral member 70D having an opening formed at a position of the central member 70C. And the pressing steel plate joining step may be performed by joining the peripheral member 70D to cover the elastic plate 60 and welding the central member 70C to the upper surface of the peripheral member 70D. Fig. 9 is an explanatory diagram of a case where the press iron plate 70 is composed of a central member 70C and a peripheral member 70D.

Since the cable C is installed in the field, the position of the cable C may be inaccurate. Since the press plate 70 is hard, unlike the elastic plate 60, the cable C is installed at an incorrect position It may not be easy to install the press iron plate 70 so that the cable C is inserted into the center hole 70a of the press iron plate 70. [ When the press iron plate 70 is composed of the central member 70C and the peripheral member 70D, the peripheral member 70D is first installed and the central member 70C is positioned at the position of the cable C, It is possible to easily install the cable C even if an error occurs in the installation position of the cable C. The central member 70C has a larger size than the opening formed at the center of the peripheral member 70D so that the rim portion of the central member 70C overlaps with the peripheral member 70D, The center member 70C can cover the opening of the peripheral member 70D even if the center of the member 70D does not fit, thereby making it possible to have a closed structure.

FIG. 10 shows a second embodiment of the method of reinforcing a cable passage hole degree according to the present invention in order.

A reinforcing method of a cable passage hole formed in a sheet pile 30 constituting an earth retaining wall comprises the steps of: a) inserting a cable through hole H into the sheet pile 30, Forming a cable through-hole; b) installing a cable (C) protruding outside the seat pile (30) through the cable passing hole (H); c) applying a waterproofing material (50) to a front portion of the cable passing hole (H) of the cable (C); d) attaching an elastic plate (60) having a center hole (60a) at a position coinciding with the cable (C) to the sheet pile (30); e) a center hole 70a is formed at a position coinciding with the cable C and a press iron plate 70 having an area larger than that of the elastic plate 60 is positioned on the upper surface of the elastic plate 60, And pressing the steel sheet (70) to the pile (30).

A detailed description of the second embodiment will be omitted, while the parts common to the first embodiment will be described.

In the first embodiment, if the pressurized steel plates 70 are joined by screws, they are welded in the second embodiment. Accordingly, in the second embodiment, the male thread welding step is omitted, and the male screw passing holes 60b and 70b need not be formed in the elastic plate 60 and the pressing steel plate 70. The pressing iron plate 70 is formed to be larger than the elastic plate 60 so that the sheet pile 30 and the pressing iron plate 70 can be welded with the elastic plate 60 interposed therebetween. As shown in Fig. 11, an insertion groove 70c coinciding with the area and thickness of the elastic plate 60 is formed on the surface where the pressed iron plate 70 is brought into contact with the elastic plate 60, The pressing steel plate 70 and the sheet pile 30 can be brought into contact with each other so that the welded joining of the pressed steel plate 70 can be facilitated.

As described above, the members used in the present method can be manufactured and used immediately in the field according to the circumstances of the site because no special machining is required other than forming the openings and it is easy to manufacture. Even the unskilled can use the method easily.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be obvious that various modifications may be made within the scope of the idea. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

30: sheet file 30 ': outer sheet file
40: male thread 50: adhesive waterproofing material
60: elastic plate 60a, 70a: center hole
60b, 70b: male screw passing hole 70:
70C: central member 70D: peripheral member
80: Nut
C: Cable D: Perforation hole
H, H ': Cable through hole R: Bulb

Claims (6)

In the reinforcing method of the cable passage hole formed in the seat pile 30 constituting the earth retaining wall body,
a) forming a cable passage hole (H) in the seat pile (30);
b) welding a plurality of male threads (40) around the cable through hole (H);
c) installing a cable (C) protruding outside the sheet pile (30) through the cable through hole (H);
d) applying a waterproofing material (50) to a front portion of the cable through hole (H) of the cable (C);
e) An elastic plate 60 having a central hole 60a formed at a position coinciding with the cable C and having a male screw hole 60b formed at a position coinciding with the male screw 40 is inserted into the seat pile 30, wherein the attachment of the elastic plate (60) is performed before the adhesive waterproof material (50) applied in the step d) is cured;
f) a pressing iron plate 70 having a central hole 70a at a position coinciding with the cable C and having a male screw hole 70b formed at a position coinciding with the male screw 40, 60, and then a nut 80 is tightened to the male screw 40,
Wherein the pressing iron plate (70) is provided with a pressing rib (71) having a shape that surrounds the center hole (70a) on a surface contacting the elastic plate (60) .
In the reinforcing method of the cable passage hole formed in the seat pile 30 constituting the earth retaining wall body,
a) forming a cable passage hole (H) in the seat pile (30);
b) installing a cable (C) protruding outside the seat pile (30) through the cable passing hole (H);
c) applying a waterproofing material (50) to a front portion of the cable passing hole (H) of the cable (C);
d) attaching the elastic plate (60) having the center hole (60a) at a position corresponding to the cable (C) to the sheet pile (30), wherein the attachment of the elastic plate (60) A sticking waterproofing material (50) is advanced before being cured;
e) a center hole 70a is formed at a position coinciding with the cable C and a press iron plate 70 having an area larger than that of the elastic plate 60 is positioned on the upper surface of the elastic plate 60, And a pressurized steel sheet joining step of welding the pressurized steel sheet (70) to the pile (30)
Wherein the pressing iron plate (70) is provided with a pressing rib (71) having a shape that surrounds the center hole (70a) on a surface contacting the elastic plate (60) .
3. The method according to claim 1 or 2,
The cable installation step may include the steps of forming a perforation hole D by perforating the outer ground of the sheet pile 30 through the cable through hole H and inserting the cable C into the perforation hole D And forming a bulb (R) by grouting in the perforation hole (D). The method of reinforcing a degree of a cable through hole formed in a sheet pile.
3. The method according to claim 1 or 2,
The earth retaining wall further comprises an outer sheet file (30 ') formed outside the sheet pile (30) and spaced apart from the sheet pile (30);
The cable installation step may include the steps of forming a cable through hole H in the outer sheet file 30 'and inserting the sheet file 30 and the outer sheet file 30' (C) on the outer surface of the outer sheet file (30 ') so as to expose the cable (C) as a tie cable which maintains a gap between the outer sheet file (30' And fixing the cable passing holes to the sheet piles.
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