KR20100006754A - Pressing apparatus of casing of retaining well construction and the constructing method thereof - Google Patents

Abstract

PURPOSE: A casing pressing apparatus of earth retaining construction and an earth retaining construction method using the same are provided to execute the work regardless of the interference of an obstacle, to reduce the construction period by simplifying the process, to precisely lay a casing, and to prevent generation of contaminant in advance. CONSTITUTION: A casing pressing apparatus(100) of earth retaining construction comprises a lower support(110), an upper support(120), a casing support, plural guide bars(140), and an ascending/descending cylinder(150). The lower support grips the casing and vertically moves the casing up and down. The upper support mounts the casing supported to the lower support. The casing support prevents the separation of the casing mounted on the inside of the upper support. The guide bar supports the lower and upper supports and guides the lower support in ascending/descending of the lower support. The ascending/descending cylinder guides the ascending/descending of the lower support.

Description

Casing press-fitting device for earthquake construction and construction method for earthquake construction using the same {PRESSING APPARATUS OF CASING OF RETAINING WELL CONSTRUCTION AND THE CONSTRUCTING METHOD THEREOF}

The present invention relates to a casing indentation device of the earthwork construction to excavate the ground to prevent the collapse or spillage of soil during civil engineering, construction work, and construction method using the same, and more specifically, by pressing the casing and forcibly embedded The lower supporting part and the upper supporting part where the casing is firmly mounted, and the holding part holding the casing allow the casing to be forced-in vertically buried in the ground, so that work can be performed regardless of obstacles such as high voltage lines or bridges or inside the factory. In addition, the construction period can be shortened by a simple process and can be accurately buried by the vertical descent of the casing, and the casing indentation device and the construction method using the same can be used to prevent contaminants. will be.

In general, in order to construct various structures such as apartments, buildings or bridges, foundation excavation works are carried out to excavate the ground which is the foundation of the structure to a certain depth. If the infiltration water is eluted into the foundation site, it will not only be difficult to work, but also it may adversely affect the strength and safety of the structure to be constructed. In order to prevent the groundwater and the infiltration water from leaching out of the foundation site, a water barrier wall is constructed.

One of the commonly used methods for constructing such a water barrier wall is to use auger machine provided on the ground excavation equipment to drill a pile ball having a predetermined diameter on the ground in a row, and then cast concrete on the drilled pile ball. The method for forming a wall is widely known.

1 is a view showing the ground excavation equipment that is conventionally used for earthquake construction, the leader 13 supported by the support arm 11 and the backstay 12 is vertically supported at the front end of the crane 10. Installed on the front of the leader 13, the organo driving device 16 and the orga screw holder 17 suspended by a hoisting cable 15 wound on a pair of pulleys 14 installed on the top of the leader 13; ) Are installed so as to move up and down along the leader 13, and the casing 18 having a circular tubular shape is mounted at the lower end of the organ driving device 16, and the excavation bit at the lower end of the organ screw holder 17. It is comprised so that the orgas screw 20 provided with 19 may be mounted.

In the method of embedding the casing in the ground using the conventional ground drilling equipment configured as described above, the organo driving device 16 is lowered along the reader 13 supported by the support arm 11 and the backstay 12. The casing 18 mounted at the lower end of the miso driving device 16 is embedded in the soft ground.

However, in order to bury the casing 18 by such a misleading driving device 16, as shown in FIG. 1, the long supporting device 16 supports the misleading driving device 16 and lowers the misleading driving device 16. Bar 13 must be configured essentially, there is a problem that is limited to the workspace by the height of the leader (13).

That is, there may be an obstacle that interferes with the height of the leader 13 such as a construction site or a bridge under a bridge or inside a factory where a high voltage line passes by the height of the long leader 13 installed high from one side of the crane 10. In this case, there is a problem in that it is not possible to proceed with the ground excavation work as the leader 13 can not be installed.

In addition, since the support arm 11 and the backstay 12 supporting the leader 13 must be essentially configured, the ground excavation equipment at the construction site is inevitably caused to increase the size of the ground excavation equipment. There is a problem that the space occupied is very large and the space utilization of the construction site cannot be efficiently used.

In addition, since the method of embedding the casing 18 on the ground is made by the rotary self-weighting method of the miso driving device 16 supported and lowered by the leader 13, the vertical embedding of the casing 18 becomes difficult. As the casing 18 is deeper and deeper into the soft ground, the lower end of the casing 18, which is pressurized into the soft ground, does not maintain the correct verticality due to the soil condition, and thus rotates inside the casing 18. There is a problem that the lower end of the pile hole to be drilled by the Oga screw 20 is formed obliquely.

In addition, in order to construct the earthquake in the soft ground by using the conventional ground excavation equipment, the diameter of the primary file hole where the concrete pile is to be placed by embedding the casing by using the Oga driving device in the soft ground to be constructed After drilling at intervals, each concrete is poured into the drilled primary pile holes, and then the casings are laid out before the dried concrete dries and then placed in the drilled primary pile holes after 2-3 days. When the concrete is cured and a solid primary concrete pile is formed, the secondary pile holes are drilled by laying the casing using the OGA driving device for each space of the primary pile construction, and then the concrete is placed in the drilled secondary pile holes. The embedded casing is drawn before the concrete dries.

In addition, after 2 ~ 3 days, when the concrete placed in the drilled secondary pile hole is cured to form a solid secondary concrete pile, construct the pile gap structure between the primary concrete pile and the secondary concrete pile. Complete the construction of the soil barrier by sealing the gap between the concrete piles.

In the conventional construction method of the earthquake construction method of this method, after the curing of the primary concrete pile placed in the primary pile hole is completed, the secondary concrete pile is to be poured by drilling the secondary pile hole, so that the construction period is not only long. Even after the construction of the secondary concrete pile and the secondary concrete pile, the construction of pile gap structure to prevent the gap between the primary concrete pile and the secondary concrete pile has to be carried out separately, which requires a lot of time and cost. have.

Moreover, the need to draw the casing buried before curing of the poured concrete requires the laying of additional reinforcing bar reinforcement such as H beam to maintain strength, which leads to the increase of city park price, uneconomical efficiency, and a significant decrease in work efficiency. have.

As a prior art, a casing for a ground excavator equipped with a guide member and a method for constructing a wall using the same have been conceived, which is used to drill a pile hole in which a concrete pile is to be placed on a soft ground. By inserting the guide portion and the guide insertion groove for guiding the insertion direction of the casing on the outer both sides of the tubular ground excavator casing in the longitudinal direction, respectively, a plurality of concrete pile holes are continuously adjacent to each other while maintaining parallel The construction can be greatly improved by improving the workability, and by using the ground excavator casing provided with the guide member to construct the wall, the concrete pile holes drilled in the soft ground are kept in parallel with each other. To be able to drill successively in succession to each pile So that the gap between the concrete piles that are formed by the installation of concrete construction can not occur at all, because it is so that you can significantly reduce the time and cost of construction work chasubyeok.

However, such a prior art does not solve various problems caused by the height of the leader lowering the false driving device while supporting the false driving device for embedding the casing as described above. As the pile is formed by pouring concrete into the ball, it does not solve various uneconomic problems caused by curing time of the poured concrete.

The present invention has been made to solve the problems in the conventional ground excavation work, the lower support for gripping the casing to force the casing and the casing support for supporting the casing is opened and mounted so that the front of the casing The casing press-fitting device is composed of the upper support part provided and the gripping part provided in the lower support part to hold and release the outer surface of the casing by force so that the installation height from the ground is not high. It can be installed without any, and the casing is vertically buried in the ground to improve the verticality of the casing, and the pile is filled by the adsorption or binding force between the sand and soil by filling sand inside the casing instead of placing concrete. Can be formed to significantly reduce the increase in time due to the curing of concrete This not only improves work efficiency, but also maintains strength without additional reinforcing materials such as H beam, leading to a reduction in construction cost, and shortening construction period by simple process and preventing contaminants in advance. The purpose of the present invention is to provide a casing press-fitting device and a construction method using the same.

As a means for achieving the above object, the present invention, the inlet hole is so that the casing is introduced into the inner support, the first forward / reverse hydraulic cylinder and the first cylinder of the first forward / reverse hydraulic cylinder, respectively on both inner ends A first connecting link connected to the rod and one end connected to the end of the first connecting link and connected to the lower side by a rotation pin, and a gripping portion for gripping the outer surface of the casing at the outer end to vertically raise / lower the casing. A lower support part; An upper support part positioned at an upper side of the lower support part to open a casing supported by the lower support part, and having a drawing groove formed at both inner surfaces thereof; A casing support part provided at each of both inner ends of the upper support part to prevent detachment of the casing mounted inside the upper support part; A plurality of guide bars provided between the lower support part and the upper support part to support the lower support part and the upper support part and to guide the lower support part when the lower support part is raised and lowered; A lower end is fixed to the upper surface of the lower support portion and the upper end is fixed to the lower surface of the upper support portion provides a casing indentation apparatus comprising a lifting / lowering cylinder to guide the lifting and lowering of the lower support portion. .

In addition, the casing charging step of charging the lower end of the casing to the lower support portion of the casing press-fit device and the upper end of the casing to the inside of the upper support portion to firmly grip the casing by the grip portion of the lower support portion; After placing the casing supported by the lower support and the upper support on the soft ground to be constructed, the grips provided at both inner ends of the lower support are forced to the outer surface of the casing, and then the lower support is forced. A casing embedding step of vertically burying the casing by continuously connecting the casing to the soft ground by pressing down; A perforating step of perforating the inside of the casing embedded in the ground by the casing embedding step by using an orgas screw; A sand filling step of filling sand into the casing in which the inside is punched by the drilling step; A trench for carrying out the trench without removing the casing filled with sand by the sand filling step; After the construction of the trench is completed by the excavation step provides a mud construction method using a casing indentation device of the mud works, characterized in that it comprises a casing drawing step for drawing the casing buried in the ground.

Casing indentation apparatus of the present inventors earthquake construction method and the earthquake construction method using the same, because the casing is buried by the lower support portion descended by the hydraulic cylinder in the forced grounding method by embedding the casing in the soft ground, the casing is buried, Not only makes the work easier, but the height of the casing press-in device for embedding the casing is low, so it can be used without restriction on the work site such as inside the factory, under the high-voltage cable, or under the bridge. As the construction of the soil membrane prevents the delay of the construction period due to concrete curing, the construction period can be greatly reduced, and the work efficiency can be greatly improved. Also, the H beam and The reinforcement is greatly improved without the need for additional reinforcement. Economically very efficient as it greatly reduces the cost.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings.

In describing the present invention, the term or word used in the present specification and claims is based on the principle that the inventor can appropriately define the concept of the term in order to best describe the invention of his or her own. It should be interpreted as meanings and concepts corresponding to the technical idea of

Figure 2 is a perspective view showing a casing indentation device which is a main component of the casing indentation apparatus of the present invention and the construction method using the same;

Figure 3 is a conceptual diagram showing an example of the casing indentation device which is a main component of the casing indentation device of the present inventors construction and the construction method using the same.

Figure 4 is a block diagram showing the configuration of the lower support portion, which is a constituent portion of the casing indentation apparatus of the present inventors earthwork,

Figure 5 is a perspective view showing the casing grip portion of the casing indentation device which is a main component of the casing indentation device of the present inventors construction method and the earth construction method using the same,

Figure 6 is a block diagram showing the configuration of the casing gripping portion, which is a main component of the casing indentation device and the construction method using the same of the present inventors construction,

7A and 7B are conceptual views illustrating a state in which a casing is gripped by a casing gripping part, which is a constituent of a casing press-fitting device of the present invention, and a construction method using the same;

8 is a conceptual diagram showing an example of the operation of the casing indentation device of the present invention, the main component of the casing indentation device and construction method using the same;

Figure 9 is a conceptual diagram showing the hydraulic flow diagram of the casing indentation apparatus and the construction method using the same of the present inventors earthwork,

10 is a process chart showing a process of the present invention construction method.

11 is a plan view illustrating a state in which casings of the present invention are connected to each other.

Casing indentation apparatus of the present inventors and earth construction method using the same, the casing indentation device 100 for embedding the casing (C) in the soft ground and drawing the embedded casing (C) again, and the casing indentation device (100) It relates to a construction method using a crust.

Casing indentation apparatus 100 of the present inventors of the earthquake construction, the inlet hole 111 through the casing (C) is inserted into the inner support as shown, the first front / reverse hydraulic cylinder 112 at both ends of the inside, respectively; 112, first connecting links 113 and 113 connected to the first cylinder rods 112a of the first and the reverse hydraulic cylinders 112 and 112, and the first connecting links 113. One end is connected to the end of the 113 and is connected to the lower side by the pivot pin 114, and the gripping parts 115 and 115 are provided on the outer end to grip the outer surface of the casing C. The front is opened so that the lower support 110 to vertically move up and down, and the casing (C) which is located on the upper side of the lower support 110 and is supported by the lower support 110, withdrawal grooves 121 on both inner surfaces. ) Is formed in the upper support portion 120, and the casing (C) which is provided at both ends of the inner side of the upper support portion 120 is mounted to the inner side of the upper support portion 120 is separated The casing support 130 and the lower support 110 and the upper support 120 to prevent the support is provided between the lower support 110 and the upper support 120 and at the same time of the lower support 110 A plurality of guide rods 140 for guiding the lower support part 110 when lifting and lowering, and a lower end is fixed to the upper surface of the lower support part 110 and the upper end is fixed to the lower surface of the upper support part 120 to the lower support part Lifting / lowering cylinder 150 to guide the lifting and lowering of the 110 is made.

In addition, the casing support part 130 provided at each of both inner ends of the upper support part 120 may include second forward and backward hydraulic cylinders 131 and 131 positioned at both inner ends of the upper support part 120, respectively. Second connecting links 132 and 132, one side of which is connected to the front end of the second forward and reverse hydraulic cylinders 131 and 131, respectively, and the other side of the second connecting links 132 and 132 is hinged at the end. The casing is connected by a pin 133 and is cut out from the withdrawal groove 121 formed on both inner surfaces of the upper support part 120 to block the outer surface of the casing C mounted on the inner side of the upper support part 120. C) is composed of grip arms (134, 134) to prevent the departure from the upper support (120).

The casing indentation apparatus 100 of the present invention, which is constituted as described above, is configured at the tip of the crane 200, and when the casing C is embedded in the soft ground, the casing C is not a rotor weight method. Since the casing C is embedded by a forced press-fit method by the hydraulic pressure of the hydraulic cylinder, the verticality of the casing C is formed evenly and the embedding is prevented, and the phenomenon of vertical deviation toward the lower side of the casing is prevented.

In addition, a large height leader mounted on the conventional ground excavation equipment or a device such as a backstay supporting the leader is not required, thereby reducing the production cost, and the height of the casing indentation device 100 is increased. It can be used even if there is an obstacle on the upper side, such as under a high voltage line, under a bridge, or inside a factory, so it is not limited to the construction site.

The holding parts 115 and 115 configured at both inner ends of the lower support part 110 to force-grip and hold the outer surface of the casing C are respectively provided with first pre / reverse hydraulic pressure at both inner ends of the lower support part 110. When the hydraulic pressure is supplied to the first forward / backward hydraulic cylinders 112 and 112 by the cylinders 112 and 112, the cylinder rod 112a of the first forward / backward hydraulic cylinder 112 is used. Is advanced and thus the first connection link 113 and 113 connected to the cylinder rod 112a is rotated by the pivot pin 114 so that the gripping portions 115 and 115 move toward the outer surface side of the casing C. It is moved and grips the outer surface of the casing C by force.

In addition, when the gripping portions 115 and 115 hold the outer surface of the casing C in this way, the lower support portion 110 is lowered by the lifting / lowering cylinder 150 while the casing C is grounded. It is forcibly pressed in and buried.

As such, the lower support part 110 is lifted again in a state in which the casing C is partially buried, and the gripping force of the grip parts 115 and 115 holding the outer surface of the casing C is released. Lifting of the lower support 110 is made smoothly, and the lower support 110, which is elevated along the outer surface of the casing (C), is again lowered by holding the outer surface of the casing (C) to force-in the casing (C) Buried is done. Since the casing C is buried in the ground while the operation is repeatedly performed, the buried work by the vertical forced press-fit method of the casing C is possible.

The casing support part 130 provided on the upper support part 120 is operated by the hydraulic pressure supplied to the second forward / reverse hydraulic cylinder 131 so that the grip arm 134 is operated inside the upper support part 120. The casing (C) to be mounted is to prevent the departure from the outside of the upper support portion 120 is firmly, when the casing (C) is inserted into the inside of the upper support portion 120 and mounted, the forward / reverse hydraulic cylinder ( The hydraulic pressure is supplied to the 131, and accordingly, the cylinder rod 131a of the second forward / reverse hydraulic cylinder 131 is advanced to pull one side of the second connection link 132 connected to the cylinder rod 131a. The second arm of the second link link 132 is connected to the outer surface side of the casing (C) mounted on the inner side of the lifting and lowering support portion 120, the grip arm 134 hinged by the hinge pin 133 (casing ( Blocking the outer surface of the C) casing (C) is out of the upper support portion 120 It prevents.

In the present invention, the casing indentation device 100 of the earthquake construction is controlled by the flow of hydraulic pressure, as shown in Figure 8, the hydraulic pressure flows by the hydraulic pump 102 operated by the operation of the engine 101 The operation of the grip arm 134, that is, the grip arm 134 grasps or releases the outer surface of the casing C by operating the forward / reverse hydraulic cylinder 131, causes the hydraulic pump 102 to operate. The hydraulic pressure flowing through the plurality of valves 103 is transmitted to the first and second forward / reverse hydraulic cylinders 112 and 131 or from the first and second forward / reverse hydraulic cylinders 112 and 131. The extracted hydraulic pressure is stored again through the hydraulic storage tank 104, and is recycled and used.

It describes the process of constructing the mud using the casing indentation apparatus 100 of the muddle construction of the present invention configured as described above.

The construction method using the casing indentation device of the earthquake construction according to the present invention, the casing charging step (S1), casing buried step (S2), drilling step (S3), sand filling step (S4), and trench It consists of a step S5 and a casing drawing step S6.

The casing charging step (S1), the casing (C) is charged to the lower support portion 110 of the casing press-fit device 100 and the upper end of the casing (C) mounted on the inner side of the upper support portion 120, the lower support portion The casing C is firmly supported by the holding parts 115 and 115 configured at 110, and the casing C is upper part by the casing support part 130 provided in the upper support part 120. The outer surface of the casing C is firmly gripped by the gripping parts 115 and 115 of the lower support part 110.

The casing embedding step (S2) is to bury the casing (C) firmly supported by the lower support part 110 and the upper support part 120 by the casing charging step (S1) on the ground, and the lower support part ( The casing (C) supported by the 110 and the upper support portion 120 is placed on the soft ground to be constructed with the earth block, and the lower support portion 120 is forcedly pushed down to lower the casing (C) onto the soft ground. Connect C) continuously and bury it vertically.

In this case, the holding parts 115 and 115 provided in the lower support part 110 repeatedly hold and release the outer surface of the casing C by the operation of the first forward / reverse hydraulic cylinder 112. In addition, while the lower support 110 is repeatedly lifted and lowered by the lifting / lowering cylinder 140 as shown in FIG. 7, the casing C is embedded in the ground by a forced indentation method.

The drilling step (S3) is to perforate the inside of the casing buried in the ground by the oak screw by the casing buried step (S2), after the rotary filling of the oga screw inside the buried casing (C) , The ogas screw is continuously rotated forward and withdrawn from the casing (C) to excavate the soil contained in the casing (C) to perforate the inside of the casing (C).

As described above, the inside of the casing C is perforated by the perforating step S3, and then the sand is filled into the casing of the perforated casing through the sand filling step S4. It is preferable to press firmly and fill the filled sand or soil without any problems.

Next, the process of discharging without removing the casing filled with sand by the sand filling step (S4) by the trench step (S5), and then the construction of the trench is completed by the trench step (S5). After drawing the casing buried in the ground, the construction of the earthquake is made.

As illustrated in FIG. 11, an outer surface of the casing C may further include a bracket C1 that firmly connects the casing C to another casing C, and securely fastens the bracket C1. Can be welded to the outer surface of the casing (C) by welding or fastened using bolts.

As the bracket C1 is further provided on the outer surface of the casing C as described above, an equal distance between the casing C and another casing C is maintained, as well as parallel, so that the construction of the retaining wall is made easier.

According to the present invention, the construction method using the casing press-fitting device of the earth retaining construction is to reinforce the reinforcement by the binding force in which the sand filled together with the soil of the existing ground is filled with sand or soil without filling concrete inside the perforated casing. As a result, it is possible to prevent the delay in the construction period caused by the curing time of concrete, and to improve construction workability and greatly reduce the construction cost by not having to reinforce the additional reinforcement material. Work efficiency and the formation of contaminants after construction are prevented.

The present invention is capable of various modifications in addition to those shown and described, all modifications are to be included in the scope of the present invention without departing from the scope of the invention.

1 is a block diagram showing a conventional ground drilling equipment.

Figure 2 is a perspective view showing a casing indentation device of the present invention, the main component of the casing indentation device and construction method using the same.

Figure 3 is a conceptual diagram showing an example of mounting the casing indentation apparatus of the present invention, and the main component of the construction method using the same.

Figure 4 is a block diagram showing the configuration of the lower support portion, which is a constituent portion of the casing indentation apparatus of the present earth construction.

5 is a perspective view showing a casing grip part of the casing indentation device which is a main component of the casing indentation apparatus of the present invention and the construction method using the same.

Figure 6 is a block diagram showing the configuration of the casing gripping portion that is the main component of the casing indentation apparatus and the construction method using the same of the present inventors construction.

7A and 7B are conceptual views illustrating a state in which the casing is gripped by a casing gripping portion, which is a constituent portion of the casing press-fitting apparatus of the present invention and the construction method using the same.

8 is a conceptual diagram showing an example of the operation of the casing indentation apparatus of the present invention, the main component of the casing indentation apparatus and construction method using the same.

Figure 9 is a conceptual diagram showing the hydraulic flow diagram of the casing indentation apparatus and the construction method using the same of the present inventors construction.

10 is a process chart showing a process of the present invention construction method.

11 is a plan view illustrating a state in which casings of the present invention are connected to each other.

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

100: casing press-fit device 110: lower support

111: drawn-in hole 112: 1st front and reverse hydraulic cylinder

113: first connection link 114: rotating pin

115: grip portion 120: upper support portion

121: drawing groove 130: casing support

131: 2nd forward and reverse hydraulic cylinder 132: 2nd connecting link

133: hinge pin 134: phage arm

140: guide rod 150: up / down cylinder

S1: Casing charging step S2: Casing buried step

S3: drilling step S4: sand filling step

S5: Digging step S6: Casing drawing step

Claims (3)

An inlet hole 111 is formed through the casing C so that the casing C is supported therein, and the first forward / backward hydraulic cylinders 112 and 112 and the first forward / backward hydraulic cylinders 112 are respectively provided at both ends of the casing C. One side of the first connection link 113 and 113 connected to the first cylinder rod 112a of 112 and one end of the first connection link 113 and 113 are connected to each other by a pivot pin 114. A lower support part 110 connected to the lower side and provided with a grip part 115 and 115 for gripping an outer surface of the casing C at an outer end thereof to vertically raise / lower the casing C; An upper support part 120 positioned at an upper side of the lower support part 110 to open a front surface of the casing C supported by the lower support part 110 and having a withdrawing groove 121 formed at both inner surfaces thereof; A casing support part 130 provided at both inner ends of the upper support part 120 to prevent detachment of the casing C mounted inside the upper support part 120; The lower support part 110 is provided between the lower support part 110 and the upper support part 120 to support the lower support part 110 and the upper support part 120, and at the same time the lower support part 110 is raised and lowered. A plurality of guide rods 140 to guide the; The lower end is fixed to the upper surface of the lower support portion 110 and the upper end is fixed to the lower surface of the upper support portion 120 is to include the lifting / lowering cylinder 150 to induce the lifting and lowering of the lower support 110 Casing press-fitting device for earthquake construction characterized in. The method of claim 1, Casing support portions 130 provided on both inner ends of the upper support portion 120, Second forward / reverse hydraulic cylinders 131 and 131 positioned at both inner ends of the upper support part 120; Second connecting links 132 and 132 connected to one end of each of the second forward and backward hydraulic cylinders 131 and 131; The other side of the second connection link (132, 132) is hinged at the end by a hinge pin 133 and withdrawn from the withdrawal groove 121 formed on both inner surfaces of the upper support portion 120 and the upper support portion 120 Blocking the outer surface of the casing (C) which is mounted to the inside of the crust (C) is characterized in that it comprises a grip arm (134, 134) which prevents the casing (C) from being separated from the upper support 120 Casing indentation device. Casing C is charged to the lower support 110 of the casing press-fit device 100 and the upper end of the casing C is mounted on the inner side of the upper support 120 to hold the grip portion 115 of the lower support 110 A casing charging step S1 for firmly supporting the casing C by the 115; The casing C supported by the lower support part 110 and the upper support part 120 is positioned on the soft ground to be built, and the grip parts 115 provided on both inner ends of the lower support part 110 respectively. After the 115 is forcedly gripped on the outer surface of the casing C, the lower support part 110 is forcedly pushed down, and the casing C is continuously connected to the soft ground by casing C. Step S2; A perforating step (S3) of perforating the inside of the casing embedded in the ground by the casing embedding step (S2) with an orgas screw; A sand filling step (S4) of filling sand into the casing in which the inside is perforated by the drilling step (S3); A stepping step (S5) of carrying out the stepping without removing the casing filled with sand by the step of filling the sand (S4); After the construction of the trench is completed by the trenching step (S5), the casing withdrawal step (S6) for drawing a casing buried in the ground comprises a mudstone construction method using a casing indentation device of the earthwork construction.

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