KR102168528B1 - Underground continuous wall underpinning device capable of drawing casing and its method - Google Patents

Abstract

Disclosed is an apparatus for underpinning an underground continuous wall capable of drawing a casing. According to the present invention, the apparatus for underpinning an underground continuous wall capable of drawing the casing includes: a reinforced net installed on an installation hole pre-excavated for constructing the underground continuous wall; a casing inserted into the installation hole for underpinning; and a casing cap coupled to an upper portion of the casing to be detachable, wherein the casing cap is mounted on a casing drawing device so that the casing is drawn by an upper movement or a rotational movement after concrete is placed into the installation hole and the casing is drawn by a ring provided on the casing cap to be discharged to the outside of the installation hole.

Description

An underground continuous wall underpinning device capable of drawing a casing and its method {UNDERGROUND CONTINUOUS WALL UNDERPINNING DEVICE CAPABLE OF DRAWING CASING AND ITS METHOD}

The present invention relates to an apparatus and method for underpinning an underground continuous wall capable of drawing a casing, and more particularly, to an underground continuous wall capable of drawing a casing, allowing the casing to be pulled out and reused in an underpinning method of constructing an underground continuous wall. It relates to an underpinning apparatus and a method thereof.

The demand for new spaces is increasing in large urban areas with high population density and dense structures such as buildings.

The underpinning construction method refers to a method of newly constructing and reinforcing a foundation to increase the depth or support of the foundation of an existing structure.Especially, a method for reinforcing the lower part of a structure in the case of a narrow working space such as an urban area. It is difficult to find, but the underpinning method is used at this time.

In Korea, the underpinning method is mainly applied to the intersection and close construction of railroads, bridges, roads, underpasses under rivers, and common wards.1) When a new structure is required to be constructed directly under an existing structure, 2) an existing structure It is applied as a comprehensive meaning to constructions such as when deep excavation is necessary close to, 3) when the support capacity of the existing structure is insufficient, or when differential settlement occurs.

In the prior art of constructing an underground continuous wall, first, in consideration of the design thickness of the underground continuous wall, the ground is excavated into a trench having a predetermined width to form a "installation hole", and then concrete is poured into the installation hole to Will build. However, in consideration of construction efficiency, in general, the installation hole is excavated only to the depth to the top of the rock mass, and vertical piles made of steel H beams, etc. are installed up to the deeper rock mass so that the vertical pile supports the underground continuous wall. At the same time, the vertical pile is made to function as an earthen barrier structure in the lower part of the underground continuous wall.

In the conventional underpinning method, after forming an installation hole, a casing made of steel pipe is inserted into the installation hole, and a perforator enters the inside of the casing to drill the bottom of the installation hole to a predetermined depth at the installation position of the casing, and then vertical pile. By inserting the vertical pile to be fixed in the hole of the perforated rock mass.

In the conventional case, it was very difficult to draw the casing after the vertical pile was installed. For this reason, the construction of the underground continuous wall was completed by injecting a filling material into the casing while leaving the casing as it is. However, since the casing does not function as a structural material, leaving the casing as it is not only excessive reinforcement, but also increases construction cost.

Korean Patent Registration No. 10-1311803 (2013.09.25.)

The present invention was conceived to solve the problems of the prior art described above, by inserting and drawing a casing in the underpinning method, so as to avoid excessive reinforcement and drastically reduce the construction cost, the casing drawable underground continuous wall It is an object to provide an underpinning apparatus and a method thereof.

An underground continuous wall underpinning apparatus capable of drawing a casing according to an embodiment of the present invention for solving the above-described technical problem comprises: a reinforcing bar mesh inserted into an installation hole previously excavated to build an underground continuous wall; A casing inserted into the reinforcing bar for underpinning; And a casing cap detachably coupled to the upper portion of the casing, and after pouring concrete into the installation hole, the casing cap is mounted on a casing drawing device so that the casing is pulled out by an upward movement or rotational motion, and the The casing is lifted by a ring provided in the casing cap and discharged to the outside of the installation hole.

The casing cap includes a casing cap top plate having a diameter larger than that of the casing; A casing cap outer steel pipe fitted outside the casing and coupled to the casing cap upper plate; A casing cap inner steel pipe inserted into the casing and coupled to the casing cap upper plate; And a coupling groove provided in a predetermined position on the inner steel pipe of the casing cap and formed so that the casing cap coupling protrusion provided in the casing is detachable by relative rotation with the casing.

A support groove is provided at a predetermined width and height below the outer steel pipe of the casing cap, and a support portion supported by the casing pull-out device is provided in the support groove.

An insertion part inserted into the support groove; And a support block connected to the insertion part and supported by the pulling device.

In the case of installing the casing on the reinforcing bar, it characterized in that it further comprises a casing guide portion formed in a predetermined length above the reinforcing bar.

The casing guide portion, a protruding plate protruding from the reinforcing bar network; A length adjustment coupling portion provided in a'ㅛ' shape so that the protruding plate is inserted and coupled to the protruding plate to correspond to the diameter of the casing; And a pin portion provided to couple the length adjustment coupling portion to the protrusion plate.

A lower casing cap is provided at a lower end of the casing to be detachably coupled to the lower end of the casing, and a plurality of holes are formed in the casing lower cap.

In another embodiment of the present invention for solving the above-described technical problem, the method of constructing an underground continuous wall capable of drawing out a casing includes inserting a reinforcing bar net into an installation hole provided for constructing an underground continuous wall, and vertically casing the reinforcing bar network. Inserting; Filling concrete in the installation hole by using a tremi pipe; Mounting a casing pulling device on the casing cap after a preset time and starting pulling of the casing by an upward movement or rotational motion; Lifting the casing by a ring provided in the casing cap and discharging it to the outside of the installation hole; And inserting a protective cap into the upper portion of the empty vertical hole by which the casing is lifted.

The preset time is characterized in that it is a time required for the concrete being hardened on the outside of the casing to be completely hardened and to retain the strength of the concrete not to be destroyed or deformed when the casing is drawn out.

When the installation hole is excavated only to the depth to the top of the rock mass, the step of excavating the drilling hole using the vertical hole; And a vertical pile installation step of installing a vertical pile such as an H beam in the perforated hole so that the vertical pile supports the underground continuous wall.

According to the present invention, waste of the casing can be prevented by recovering the casing that does not contribute significantly to the structure, and the casing can be easily drawn out of the installation hole regardless of the height at which the casing protrudes from the installation hole. Continuous wall construction can be carried out quickly.

1 is a perspective view showing a casing inserted into a reinforcing bar network according to an embodiment of the present invention,
Figure 2a is a plan view showing a casing inserted into the reinforcing bar network according to Figure 1;
2B is a plan view showing a casing inserted into a reinforcing bar network according to another embodiment of the present invention,
3 is an exploded perspective view showing a casing and a casing cap according to an embodiment of the present invention,
Figure 4a is a perspective view showing a support according to an embodiment of the present invention,
4B is an exemplary view showing a casing drawing device according to an embodiment of the present invention;
5 is an exploded perspective view showing a lower end of a casing according to an embodiment of the present invention,
6A to 6G are flowcharts illustrating a method of constructing an underground continuous wall capable of drawing a casing according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and similar reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

1 is a perspective view showing a casing inserted into the reinforcing bar net according to an embodiment of the present invention, FIG. 2A is a plan view showing the casing inserted into the reinforcing bar net according to FIG. 1, and FIG. 2B is a diagram illustrating another embodiment of the present invention. It is a plan view showing a casing inserted into a reinforcing bar network according to, Figure 3 is an exploded perspective view showing a casing and a casing cap according to an embodiment of the present invention, Figure 4a is a perspective view showing a support according to an embodiment of the present invention, Figure 4b Is an exemplary view showing a casing drawing device according to an embodiment of the present invention, Figure 5 is an exploded perspective view showing the lower end of the casing according to the embodiment of the present invention.

1 to 5, an underground continuous wall underpinning device capable of drawing a casing according to the present invention includes a reinforcing bar network (1a, 1b, 1c, 1d), a casing 10, a casing guide part 20, a casing It includes a cap 30, a support part 40, and a casing lower cap 50.

The installation hole (H, trench) is provided in a place where the underground continuous wall is to be built, and is excavated by an excavator. The installation hole (H) may be formed in a rectangular parallelepiped shape to the place where the rock mass is formed.

The reinforcing bar network (1a, 1b, 1c, 1d) is a vertical member and a horizontal member are combined and inserted into the pre-drilled installation hole, and is manufactured in advance to have a length corresponding to the depth of the installation hole (H) in the vertical direction. In FIG. 1, the reinforcing bar nets 1a, 1b, 1c, and 1d are illustrated to have a three-story height, but may be provided in multiple layers corresponding to the depth of the installation hole H.

According to the present invention, the casing 10 may be inserted into the reinforcing bars 1a, 1b, 1c, and 1d to be provided to the upper surface of the rock mass or to the lower part of the installation hole (H). However, in order to increase the verticality of the casing 10, a casing guide part 20 is provided in a preset place of the reinforcing bar mesh (1a, 1b, 1c, 1d), and the casing 10 is guided and installed by the casing guide part 20. Can be.

The casing 10 is inserted and installed in the reinforcing bars 1a, 1b, 1c, 1d of the installation hole H for underpinning, and may be provided as a hollow circular steel pipe.

The casing 10 is provided to correspond to the depth of the installation hole H, and when the depth of the installation hole H is very deep, several casings 10 are connected and inserted into the installation hole H.

The connected length of the casing 10 is preferably provided a little longer than the installation hole (H) so that a portion of the installation hole (H) protrudes.

At the top of the casing 10, the casing cap 30 is detachably installed when inserted into the reinforcing bar mesh (1a, 1b, 1c, 1d) and when the casing 10 is pulled out.

The casing lower cap 50 is detachably installed at the lower portion of the casing 10.

1 and 2A, the casing 10 inserted into the reinforcing bar network 1a, 1b, 1c, 1d according to an embodiment of the present invention is guided and inserted by the casing guide unit 20.

The casing guide part 20 according to an embodiment of the present invention is provided to be movable in the radial direction of the casing 10 so as to correspond to various diameters of the casing 10.

In addition, the casing guide unit 20 according to an embodiment of the present invention allows the casing 10 to be vertically inserted by rotation and length adjustment even when the reinforcing bar mesh (1a, 1b, 1c, 1d) is not installed vertically. You can induce.

The casing guide part 20 is provided in a'ㅛ' shape so that the protruding plate 21 and the protruding plate 21 protruding from the reinforcing bar network (1a, 1b, 1c, 1d) are inserted, corresponding to the diameter of the casing 10 It includes a length adjustment coupling portion (23, 25) that is coupled to the protrusion plate 21, and a pin portion 27 provided to couple the length adjustment coupling portion 21 to the protrusion plate (21).

The casing 10 is guided by the guide plate 25 provided at the ends of the length adjustment coupling portions 23 and 25.

The protrusion plate 21 may be formed in a vertical direction as long as the length of the reinforcing bar network (1a, 1b), but according to the verticality of the casing (10), various pre-set places of the reinforcing bar network (1a, 1b, 1c, 1d) It can be formed in length.

The end of the protrusion plate 21 is inserted into the length adjustment coupling portions 23 and 25, and the length adjustment coupling portions 23 and 25 are formed so as to be movable along the protrusion plate 21 according to the diameter of the casing 10. .

As shown in FIG. 1, when the length adjustment coupling portions 23 and 25 are provided only on the upper portion of the protruding plate 21, the length adjustment coupling portions 23 and 25 can be horizontally moved to correspond to various lengths of the casing 10. Of course, it may be provided to be rotatable around the protruding plate 21 according to the verticality of the reinforcing bar networks 1a, 1b, 1c, and 1d.

When the length adjustment coupling portions 23 and 25 are vertically provided to correspond to the length of the protruding plate 21, they may be provided to be horizontally moved to correspond to various lengths of the casing 10.

Referring to FIG. 2B, a casing guide part 20 according to another embodiment of the present invention is provided to correspond to a specific diameter of the casing 10.

In this case, the casing guide portion 20 includes a protruding plate 21 protruding from the reinforcing bar mesh (1a, 1b, 1c, 1d) and a cylindrical casing guide column 24 coupled to the end of the protruding plate 21 do.

The casing 10 is inserted and guided into the cylindrical casing guide column 24 and inserted into the installation hole H.

3, the casing cap 30 is a casing cap upper plate 31 having a larger diameter than the casing 10, a casing cap outer steel pipe that is fitted to the outside of the casing 10 and coupled to the casing cap upper plate 31 ( 32), the casing cap inner steel pipe 37 inserted into the casing 10 and coupled to the casing cap upper plate 31, and the casing cap inner steel pipe 37 are provided at preset positions to prevent rotation of the casing 10. The casing cap coupling protrusion 15 provided in the casing 10 by the casing includes a coupling groove 38 formed to be removable.

Accordingly, when the casing 10 and the casing cap 30 are coupled, the upper end of the casing 10 is formed between the inner peripheral surface of the casing cap outer steel pipe 32 and the outer peripheral surface of the casing cap inner steel pipe 37, the casing 10 ), the casing cap coupling protrusion 15 provided at the upper end of the casing cap 30 is inserted into the coupling groove 38 to rotate the casing cap 30, and the casing cap 30 is coupled to the casing 10.

A plurality of rings 33 are provided on the casing cap upper plate 31 to allow a cable (not shown) to be connected so that the casing 10 can be discharged to the outside of the installation hole H.

The lower part of the casing cap 30, that is, the lower part of the casing cap outer steel pipe 32, is provided with a support groove 35 with a preset width and height, and the support groove 35 is supported by a casing drawing device as shown in FIG. 4B. The supporting part 40 is provided as shown in FIG. 4A.

The support part 40 includes an insertion part 41 inserted into the support groove 35 and a support block 42 and 43 connected to the insertion part 43 and supported by a drawing device.

After pouring the concrete (C) in the installation hole (H), the casing cap 30 is mounted on the casing drawing device, and the casing 10 is pulled out by upper movement or rotational movement, and a ring provided in the casing cap 30 ( The casing 10 is lifted by 33) and discharged to the outside of the installation hole H.

If the length of the casing 10 protruding to the top of the installation hole (H) is small, the casing pulling device supports the casing cap outer steel pipe 32 of the casing cap 30 without the support part 40 to support the casing 10 Can be drawn.

However, when the length of the casing 10 protruding to the top of the installation hole (H) is long, the support part 40 is inserted into the support groove 35 and the casing drawing device supports the support blocks 42 and 43 The casing 10 can be pulled out. The support blocks 42 and 43 may be formed in various lengths, and may be installed to be adjustable in length.

5, a casing lower cap 50 that is detachably coupled to a lower end of the casing 10 is provided at the lower end of the casing 10, and the casing lower cap 50 prevents the collapse of the installation hole H. A plurality of holes 55 are formed to prevent the injection of the bentonite solution from passing, but not to pass the concrete (C).

The casing lower cap 50 includes a casing lower cap body 51, an inner casing lower cap 52, and a lower cap coupling groove 53.

The lower end of the casing 10 is coupled between the inner circumferential surface of the casing lower cap main body 51 and the outer circumferential surface of the casing lower cap inner portion 52, but the protrusion 13 provided on the inner lower end of the casing 10 is provided with the lower cap coupling groove ( By being inserted into 53) the casing lower cap 50 may be coupled to the casing 10 so as to be detachable. A plurality of holes 55 are provided in the casing lower cap body 51.

6A to 6G are flowcharts illustrating a method of constructing an underground continuous wall capable of drawing a casing according to the present invention.

In an underground continuous wall construction method capable of drawing a casing according to an embodiment of the present invention, a reinforcing bar network (1a, 1b, 1c, 1d) is inserted into an installation hole (H) provided for building an underground continuous wall, and a reinforcing bar network (1a) , 1b, 1c, 1d) Inserting the casing 10 vertically into the installation hole H, filling the concrete (C) using a tremi pipe (not shown), and the casing cap ( 30) by mounting a casing pull-out device (not shown) to start pulling out of the casing 10 by upper movement or rotational movement, and the casing 10 is lifted by a ring 33 provided in the casing cap 30 And a step of discharging to the outside of the installation hole (H) and inserting a protective cap (not shown) in the upper portion of the vertical hole (B) where the casing 10 is additionally lifted and empty.

Referring to FIG. 6A, an installation hole H is previously excavated and provided to build an underground continuous wall, and the installation hole H may be provided in a rectangular parallelepiped shape.

A bentonite solution or the like may be injected into the excavated installation hole H to prevent collapse of the installation hole H.

Referring to Figure 6b, insert the reinforcement mesh (1a, 1b, 1c, 1d) in the installation hole (H). The reinforcing bar network (1a, 1b, 1c, 1d) may be provided in multiple layers, and the casing guide portion 20 may be previously attached to the reinforcing bar net (1a, 1b, 1c, 1d), but the casing 10 is a casing Since it can be arranged in the reinforcing bar mesh (1a, 1b, 1c, 1d) inserted into the installation hole (H) without being guided by the guide part 20, the reinforcing bar network (1a, 1b, 1c, 1a, 1b, 1c, etc.) without the casing guide part 20 1d) can be inserted into the installation hole (H).

6B to 6G illustrate a state in which the casing guide portion 20 is attached to the reinforcing bar nets 1a, 1b, 1c, and 1d as an example.

Referring to Figure 6c, the casing 10 is guided to the reinforcing bar network (1a, 1b, 1c, 1d) to be seated in the lower part of the installation hole (H), and the casing (10) protrudes from the top of the installation hole (H). Is formed to be.

The casing lower cap 50 is detachably coupled to the lower end of the casing 10, and a plurality of holes 55 are provided in the lower cap main body 51 of the lower cap 50 so that the bentonite solution is contained inside the casing 10. To enter. The plurality of holes 55 pass through the bentonite solution, but the concrete to be poured has a size such that it does not enter the casing 10.

Casing 10 may be installed with one casing 10 depending on the depth of the installation hole (H), but in most cases, since the depth of the underground continuous wall is deep, several casings 10 are connected to the installation hole (H). ) Is inserted. Also, the casing 10 cannot be cut because it must be reused. For this reason, the casing 10 protrudes at a predetermined length above the installation hole H.

6D, concrete (C) is poured through a tremi pipe (not shown) in the installation hole (H), and the concrete (C) is before the installation hole (H) excluding the inside of the casing (10). It is poured into the area.

Referring to FIG. 6E, after a predetermined time elapses after concrete is poured, the casing 10 is started to be drawn upward using a casing drawing device (see FIG. 4B).

Here, the preset time refers to the time required for the concrete being hardened on the outside of the casing 10 to retain strength so that the concrete being hardened when the casing 10 is drawn out does not completely harden, and the concrete is not destroyed or deformed. Usually, when concrete is placed, the preset time is 2 to 4 days.

The casing pull-out device of FIG. 4 grips the casing cap 30 provided in the casing 10 or grips or supports the support 40 coupled to the casing cap 30 to rotate the casing 10 or move the casing upward. Let the drawing of (10) begin.

When the casing 10 is formed with a low protruding height from the installation hole H, the casing drawing device grips or supports the casing cap 30 so that the drawing of the casing 10 starts, and the casing 10 is installed. When the height protruding from the ball (H) is formed to be high, the casing drawing device grips or supports the support part 40 so that the drawing of the casing 10 starts.

When the drawing of the casing 10 starts, the casing 10 can be moved upward with a small force. In this case, a cable (l) connected from a crane (not shown) is connected to and mounted on the hook 33 provided in the casing cap 30, and the casing 10 is lifted by a crane (not shown) and the installation hole (H) The casing 10 is discharged to the outside.

Referring to FIG. 6F, after the casing 10 is discharged, a vertical hole B is formed, and a protective cap (not shown) may be inserted and installed for reasons such as safety accidents.

Referring to FIG. 6G, a vertical pile 120 is installed into the vertical hole B.

Although not shown, when the installation hole (H) is excavated only to the depth of the rock mass, the step of excavating a drill hole (not shown) in the top of the rock mass by excavating the upper part of the rock mass through the vertical hole (B) and the drill hole It may further include a vertical pile installation step of installing a vertical pile 120 such as an H-beam (not shown) so that the vertical pile 120 supports the underground continuous wall.

When the installation of the vertical pile 120 is completed, concrete is poured into the vertical hole B to finish the construction of the underground continuous wall.

According to the present invention, waste of the casing can be prevented by recovering the casing that does not contribute significantly to the structure, and the casing can be easily drawn out of the installation hole regardless of the height at which the casing protrudes from the installation hole. Continuous wall construction can be carried out quickly.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. .

10: casing
20: casing guide part
30: casing cap
40: support
50: casing lower cap
H: installer
B: Vertical hole

Claims (10)

A reinforcing bar mesh inserted into a pre-drilled installation hole to build an underground continuous wall;
A casing inserted into the reinforcing bar for underpinning; And
Includes; a casing cap detachably coupled to the upper portion of the casing
After concrete is poured into the installation hole, the casing cap is mounted on the casing drawing device so that the casing is pulled out by an upper movement or rotational motion, and the casing is lifted by a ring provided in the casing cap to the outside of the installation hole. Is discharged,
The casing cap includes a casing cap outer steel pipe fitted to the outside of the casing and coupled to a casing cap upper plate provided with a plurality of rings, and a support groove is provided with a preset width and height below the casing cap outer steel pipe, The support groove is provided to be inserted into the support supported by the casing drawing device.
In the case of installing the casing on the reinforcing bar, the casing includes a guide portion formed in a predetermined length above the reinforcing bar, and the casing guide portion includes: a protruding plate protruding from the reinforcing bar; A length adjustment coupling portion provided in a'ㅛ' shape so that the protruding plate is inserted, and coupled to the protruding plate so as to be horizontally movable along the protruding plate to correspond to the diameter of the casing; And a pin portion provided to couple the length-adjusting coupling portion to the protruding plate; and an underground continuous wall underpinning device capable of pulling out a casing. The method of claim 1,
The casing cap,
A casing cap inner steel pipe inserted into the casing and coupled to the casing cap upper plate; And
And a coupling groove provided in a predetermined position on the inner steel pipe of the casing cap so that the casing cap coupling protrusion provided in the casing is detachably inserted by a relative rotation with the casing; Underpinning device. delete The method of claim 1,
The support part,
An insertion part inserted into the support groove; And
And a support block connected to the insertion unit and supported by the pulling device. delete delete The method of claim 1,
A casing lower cap is provided at a lower end of the casing to be detachably coupled to the lower end of the casing, and a plurality of holes are formed in the casing lower cap. Inserting a reinforcing bar mesh into an installation hole provided for constructing an underground continuous wall, and inserting a casing vertically into the reinforcing bar network;
Filling concrete in the installation hole by using a tremi pipe;
Mounting a casing pulling device on the casing cap after a preset time and starting pulling of the casing by upper movement or rotational motion;
Lifting the casing by a ring provided in the casing cap and discharging it to the outside of the installation hole; And
Including; the casing is lifted and inserting a protective cap in the upper portion of the empty vertical hole; and
The casing cap includes a casing cap outer steel pipe fitted to the outside of the casing and coupled to a casing cap upper plate provided with a plurality of rings, and a support groove is provided with a preset width and height below the casing cap outer steel pipe, The support groove is provided to be inserted into the support supported by the casing drawing device.
In the case of installing the casing on the reinforcing bar, the casing includes a guide portion formed in a predetermined length above the reinforcing bar, and the casing guide portion includes: a protruding plate protruding from the reinforcing bar; A length adjustment coupling portion provided in a'ㅛ' shape so that the protruding plate is inserted, and coupled to the protruding plate so as to be horizontally movable along the protruding plate to correspond to the diameter of the casing; And a pin portion provided to couple the length-adjusting coupling portion to the protruding plate. The method of claim 8,
The preset time is a time required for the concrete being hardened on the outside of the casing to be not completely hardened and to retain the strength of the concrete not to be destroyed or deformed when the casing is drawn out. Way. The method of claim 8,
When the installation hole is excavated only to the depth to the top of the rock mass, the step of excavating the drilling hole using the vertical hole; And
A vertical pile installation step of installing a vertical pile in the perforated hole to allow the vertical pile to support the underground continuous wall. The method of constructing an underground continuous wall capable of drawing a casing further comprising.

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