KR20060103309A - Gradual bottom-up slice and gradual infilling method for removing underground retaining wall - Google Patents

Abstract

Provide a new method for removing underground retaining walls of buildings. Conventional underground retaining wall removal construction is inevitable due to the delay of air and increase of public affairs due to the overlapping and overloading of earthen and earthwork. According to the present invention, even when the underground retaining wall to be demolished is very close to the adjacent land boundary, it is difficult to secure earthwork space for removing the retaining wall on the outside of the retaining wall. It can provide a way to fundamentally eliminate the complaints of neighbors.

According to the method of the present invention, while the base retaining wall to be removed is supported by a predetermined support structure, the soil reclamation process is repeatedly carried out by removing the lower part of the retaining wall from the lower end by using a wheel saw cutter or the like. It is a method to carry out. According to this method, the basement retaining wall is sequentially removed from the bottom side upwards upward.

Underground, Underground Retaining Walls, Demolition, Blocks, Bottom-Up, Raker, Wheel Saw Cutters

Description

Gradient Bottom-up Slice and Gradual Infilling Method for Removing Underground Retaining Wall}

1 is a block diagram showing the process of the underground retaining wall removal method according to the present invention.

Figure 2a is a partial cross-sectional view showing an example of the process of removing the inner retaining wall internal structure.

2B is a partial cutaway perspective view illustrating an example of a process of removing an underground retaining wall internal structure.

3A is a cross-sectional view showing the raker pile and the raker installation process.

Figure 3b is a perspective view showing the raker pile and the raker installation process.

3C is a detail view of the portion A and B of FIG. 3B as a detailed view of the raker installation.

Figure 3d is a cross-sectional view showing the removal of the temporary structure after the installation of the raker.

Figure 4a is a sectional view of the retaining wall support pile installation.

Figure 4b is a front view of the retaining wall support pile installation.

4C is a partial detailed perspective view illustrating a process of attaching and retaining the retaining wall support pile to the retaining wall through the connecting plate.

Figure 4d is a partial perspective view showing a state in which the installation of the raker and the retaining wall support pile on the retaining wall is completed.

FIG. 5A is a partial perspective view showing a filler injection hole for the retaining wall below the groundwater level and injecting the filler material through the hole to form the order layer on the outer side of the retaining wall.

FIG. 5B is a partial perspective view showing a filler injection hole in the vertical direction from the ground to the ground outside the base retaining wall to form a barrier layer outside the retaining wall and injecting the filler material through the hole; FIG.

FIG. 6 is a perspective view illustrating a state in which a base portion remaining attached to a lower portion of a retaining wall is removed.

It is sectional drawing which shows the state which cut | disconnects the substantially rectangular cutting block from the lower part of a retaining wall.

Figure 7b is a cross-sectional view showing the inclined cutting of the basement retaining wall cutting block body and its lifting before compaction.

FIG. 7C is a cutaway front view showing a case where trapezoidal shapes of the upper and lower narrow beams and the upper and lower lower beams are alternately formed in the transverse direction when the basement retaining wall cutting block body is viewed from the front.

Fig. 7D shows approximately 1 / th of the retaining wall cut block when the trapezoidal shape of the upper and lower narrow beams and the upper and lower narrow beams are alternately formed in the transverse direction when the retaining wall cutting block is viewed from the front. This is a front view showing that the upper narrow bottom type is removed first when soil is filled by 2 heights.

FIG. 7E is a first upper and lower beam type when the trapezoidal shape of the upper and lower narrow beams and the upper and lower beams are alternately formed in the transverse direction when the retaining wall cutting block is viewed from the front. It is the front view which shows that the thing of the upper and lower narrowing form is removed in the state which the soil was further filled by about 2/3 to 3/4 height of the retaining wall cutting block body after the removal of the shape.

7F illustrates the removal and top-side re-installation concept of the lower side raker, which is no longer required for retaining wall support as the partial incision removal process is sequentially performed from the lower end of the retaining wall through the above-described method of FIGS. 7A to 7EF. It is sectional drawing.

FIG. 7G shows the raker pile used to support the retaining wall for the portion where the retaining wall is removed while removing the bottom side raker which is soil-filled and no longer needs the retaining wall support in the process of FIG. 7F. A cross-sectional view showing the concept of drawing.

FIG. 7h illustrates a concept of removing the case where the necessity of maintaining no longer exists due to the progress of the process among the raker piles that were in charge of supporting the retaining wall with a high basement floor in the process of FIG. 7g. One cross section.

FIG. 7I is a cross-sectional view showing the drawing of the raker support pile that remained as the raker plays its role.

FIG. 7J is a cross-sectional view illustrating the final drawing of the underground retaining wall support pile, which is buried vertically in the ground, with all underground retaining walls removed and ground filled to the ground line.

FIG. 8 is a cross-sectional view illustrating a state in which all the processes up to FIG. 7J are completed and there are no obstacles in the ground.

(Explanation of main drawing code)

10: underground retaining wall 12: bearing wall inside the retaining wall

14: retaining wall side pillars 16: floor slab

18: beam 20: foundation concrete

30: Raker pile (thumb pile) 32: Raker (tilt member)

34: connecting plate 36: anchor bolt

40: retaining wall support pile 42: anchor bolt

43: anchor bolt fastening hole formed in the flange portion of the retaining wall support pile

44: connecting plate 45: weld

46: retaining wall incision

50: groundwater level 52, 56: water filler injection hole

54, 58: Lee Jae-jae

D1, D2: Provisional remaining length of foundation floor

D3: Horizontal installation spacing between retaining wall support piles

H1: Vertical spacing between retaining wall support pile connecting plate

H2: Vertical gap between incision grooves

W1: Horizontal length of incision groove

W2: Width of retaining wall support pile

GL: Ground Line

The present invention relates to a construction method for demolishing a building, and more particularly to a new construction method for removing underground retaining walls of a building.

One of the main contents of civil engineering work to build the basement of the building is the earthquake related to the trench. Underground retaining walls are constructed according to the application of various soil blocking methods, and then the temporary retaining members (soil pile, earth plate, CIP, etc.) for earthwork are removed and partially removed. I support it. Most Korean buildings over 30 years old have a large floor area, even if they have a basement floor. Most of them have a depth of about 3 floors or less and a depth of about 4 ~ 17m. The reason why older buildings have such a relatively low basement is that the number of vehicles in the past was not so large that securing underground parking spaces was not an indispensable request. Most of the underground retaining walls of past buildings over 30 years of age are to be demolished based on earthwork using soil piles, earth walls and thumb piles, or CIP depending on soil conditions.

The depth of the basement layer to which the retaining wall demolition method according to the present invention can be applied is basically useful in the case of approximately one basement level to three underground levels, but more than that is possible depending on the retaining wall supporting method related to the existing building structure. Therefore, the retaining wall demolition method according to the present invention, after demolition of the entire building including the basement floor, considering that most of the buildings that are subject to the demolition are old buildings that are more than 30 years old and the depth of the basement floor is usually 3 floors or less. It can be applied to most old buildings in Korea in case of building new buildings within the same site boundary.

If a new building is to be constructed within the same site boundary after the removal of the basement-level building, the removal of the ground above the old building is relatively difficult, but the basement, especially the underground retaining wall, is under considerable earth pressure. For this reason, if the retaining wall is directly removed from the inner space surrounded by the underground retaining wall, that is, the inner space of the basement, the bearing wall supporting earth pressure disappears at once, and the retaining wall is destroyed by the retaining wall at the same time. There is a great risk because the earth pressure that has been lost can act at once and the soil can collapse into the demolition space at once.

For this reason, even when most of the floor slabs including the inner columns of the basement are demolished during the demolition work, the underground retaining wall, which is the outer wall of the building under pressure, cannot be demolished. The entire interior space is quickly filled with external incoming soil.

 In this case, when the underground retaining wall line of the building to be constructed overlaps with the remaining underground retaining wall line, which was the object of demolition, the construction of pile drilling works for the earthquake works occurs. A land without any obstacles in the ground within the land boundary to be constructed by removing the remaining underground retaining wall by removing the remaining underground retaining wall by carrying out construction and excavation for the purpose of removing the retained underground retaining wall. The earthwork must be restarted in line with the underground retaining wall of the building to be newly constructed for the bare land without any obstacles in the ground.

The demolition method according to the present invention requires such a very troublesome, long air and expensive earthwork to remove the problematic underground retaining wall, in particular, the underground retaining wall line of the building to be constructed overlaps with the underground retaining wall line to be removed. Very effective in the application of the case.

However, even in the case of the cumbersome and expensive case as described above, when the earth retaining work and the excavation for the purpose of removing the retained retaining wall from the outside of the retained basement retaining wall are to be carried out, Since it is necessary to secure equipment carrying space, it is inevitable to obtain a spot permit for surrounding roads, which is not uncommon, which causes very large civil complaints due to noise, fear of cracking into adjacent buildings, and inevitable intrusion of the land boundary. do. In addition, if the underground retaining wall to be removed is in close contact with the adjacent land boundary, it is impossible to make the underground retaining wall demolition work itself, such as when the minimum earthwork space required for removing the retaining wall cannot be secured outside the retaining wall. There is no. This is irrelevant to the fact that the land price of the city is so expensive that the owners build the basement retaining wall in the immediate vicinity of the land boundary to build as much land as possible.

The underground retaining wall removal method according to the present invention can not only eliminate the delay of the air and increase the cost of the air, but also the underground of the earthwork and earthwork. Even if the retaining wall is in close contact with the adjacent land boundary, and it is difficult to secure earthwork space for removing the retaining wall outside the retaining wall, the construction can be easily carried out from the inside of the retaining wall without invading the adjacent site. It provides a groundbreaking way to radically eliminate the problem.

In addition, the underground retaining wall removing method according to the present invention provides a convenient method that can be installed without noise without causing adverse effects such as cracks or settlements on the surrounding buildings or ground.

The present invention is to solve the following technical problem.

First, there is no underground obstacles on the retaining wall line that is intended to be constructed by only dismantling the underground retaining walls directly and simultaneously filling the sediment inside the retaining wall without the need for a separate block construction to remove the underground retaining walls. By making bare land of non-existent form, it provides economic underground retaining wall removal method that can drastically reduce earthwork of building construction and greatly reduce public expenses.

Second, by removing the basement wall directly from the inside of the basement wall to be removed, the adverse effect on the adjacent site, which was frequently a complaint during the demolition of the basement wall, especially the surrounding building, cracking or ground subsidence problem, noise problem, public road It provides a new underground retaining wall removal method that does not cause civil complaints such as problems of private use.

Third, it is easy for difficult construction work that is difficult to apply existing methods, such as the underground retaining wall that is to be demolished is very close to the adjacent land boundary, or for other reasons, it is not possible to secure the temporary construction work space for removing the underground retaining wall. It provides a new underground retaining wall removal method that can be applied.

Fourth, it provides a new underground retaining wall removal method that can be particularly useful when the underground retaining wall line of the building to be built and the underground retaining wall line of the old building to be removed overlap each other.

Hereinafter, with reference to the accompanying drawings showing the configuration of the present invention as an embodiment thereof will be described in detail.

As shown in FIG. 1, the present invention is basically characterized by the following seven steps. Some of these seven steps may be applied as essential processes or as additional processes, and the details of the essential or additional steps will be well understood from the following description.

First step: Basement wall  Internal structure removal process

The underground part removal process is performed after the ground part of the building to be demolished is removed, and is a process of removing floor slabs, internal pillars, and beams other than the underground retaining wall under earth pressure. However, as shown in FIGS. 2A and 2B, a bearing wall 12 in contact with the retaining wall in the retaining wall 1, a column 14 adjacent to the retaining wall, and a floor slab provided between the retaining wall 10 and the bearing wall 12. (16) and / or the beam 18 spanning between the bearing wall and the retaining wall may be assisted in supporting the retaining wall during the progress of the initial process according to the present invention, so it is not removed in this step and is the second step described below. It may be potentially further maintained until this is completed. In addition, in this process, the floor slab 20 of the lowest basement layer does not remove all of its floor area, but leaves the retaining wall line along the retaining wall line as much as a distance D1 from the retaining wall line (for example, about 2m). It is preferable because it can suppress.

Second Step: Laker Pile  And Laker  Installation process

As a support pile for preventing the underground retaining wall from falling inwardly, a raker pile 30 is placed in the ground in the demolished space as shown in FIG. 3A. The installation interval of the raker pile is determined differently by the structural design according to the earth pressure and the condition of the structure (underground retaining wall), but in general, the horizontal distance between the rakers should be installed not more than 5m except where the bearing wall is located. Underground raker piles should be at least 1.5m-2m, depending on geological conditions.

After the installation of the raker pile 30, the retainer wall support raker 32 supported by the raker pile 30 is installed in a predetermined number of stages (for example, three stages) with different inclinations, and at this time, the retainer wall side raker end portion The support for the underground retaining wall surface of the rocker is mounted on the underground retaining wall 10 through a gusset plate 34 having a predetermined thickness (for example, t = 15 mm) as shown in FIGS. 3B and 3C. This can be done by fastening to a plurality of anchor bolts 36 (for example, 25 mm in diameter) or by adding a secondary chemical anchoring treatment.

After the installation of the raker pile 30 and the raker 32 is completed, as shown in FIG. 3D, the retaining wall side pillars 14 inside the retaining wall 10 that existed in the first process and the bearing wall 12 inside the retaining wall are shown. A floor slab 16 installed between the bearing wall 12 and the retaining wall 10 and / or a beam 18 between the bearing wall 12 and the retaining wall 10, and a floor foundation maintained about 2 m from the retaining wall line. 20 is removed to a predetermined length D2, i.e., within about 1 m of the retaining wall (D2? 1 m) so that it is easy to remove the retaining wall foundation thereafter.

In this process, the installation of the raker is to be carried out in one direction in order from one side, and the retaining wall pillar and the basement floor slab which were temporarily maintained in parallel with the installation of the raker are to be removed later. In connection with the process to reduce the inner weight of the basement retaining wall as much as possible.

Third process: Underground retaining wall support pile  Installation process

 When the height of the basement retaining wall is low and the load of the entire basement retaining wall is relatively small (for example, the first basement, the retaining wall depth is 1 to 4m), the basement retaining wall 10 is sufficiently lifted even by the inclined support by the raker 32. Rake 32 can maintain the raised state (i.e., both the horizontal force under which the underground retaining wall is subjected to earth pressure, etc. and the vertical force under which the underground retaining wall is settled by its own weight). While the raker 32 maintains the basement wall 10 in a lifted state, the basement wall can be incised and removed from its lower end, but if the basement wall is relatively high (e.g., more than 2 stories below, 5m height of the retaining wall) Above) When the weight of the underground retaining wall itself and the earth pressure outside the retaining wall are high, it may be difficult to support the underground retaining wall with only the raker even if a plurality of rakers are used. Therefore, even in such a case, in order to apply the bottom-up slice method according to the present invention, a separate vertical force support member is required to support the base wall more stably so that the base wall does not settle in the vertical direction while the base wall is cut and removed from below.

This process is an essential or additional process required in this case, and the construction procedure is immediately after the second process described above, and as shown in Figs. 4A to 4D, after the installation of the raker 32 is completed, the retaining wall side bottom is completed. The foundation part is cut or drilled at predetermined intervals (D3), for example, at intervals of about 5 to 7 m to completely remove the foundation concrete to expose the floor, and then install retaining wall support piles 40, which are the core elements of the process, at intervals of 5 to 7 m do. The retaining wall support pile 40 has a function of stably maintaining the underground retaining wall in a supported state so that the underground retaining wall can be removed from the bottom by the method of the present invention.

Specifically, as shown in FIGS. 4A to 4D, the process of installing the basement retaining wall supporting piles is provided in plural numbers (for example, 6 to 9) at a predetermined height H1 (for example, H1 = 1.5m) with respect to the basement retaining wall 10. ) To the anchor bolt 42 (for example, 25 mm) inserted in a group to fasten the metal connecting plate 44 of a predetermined shape (for example, a square), and to the connecting plate perpendicularly to the retaining wall 10. The retaining wall 10 and the retaining wall support pile 40 are completely integrated by welding the underground retaining wall supporting pile, and the lower end of the retaining wall supporting pile 40 is sufficiently embedded in the ground and is firmly supported. Therefore, the base retaining wall 10 has its load transmitted to the ground in the vertical direction through the retaining wall support pile 40 and the conduction force in the horizontal direction is supported by the above-described raker 32 and the raker pile 30.

On the other hand, since the wheel saw blade cannot pass in the horizontal direction with respect to the portion where the retaining wall support pile 40 is installed, as shown in FIG. 4B, the retaining wall support pile 40 is attached to the retaining wall 10 before being erected. In the vertical portion where the retaining wall support pile is to be placed, the horizontal cutting metal 46 must be put in advance at a predetermined interval H2 (for example, H2 = 1 to 1.2 m). The horizontal width W1 of this horizontal cutting metal 46, which is preliminarily inserted into the retaining wall in contact with the retaining wall support pile, is naturally larger than the flange width W2 of the retaining wall support pile (W1> W2).

In the underground retaining wall removing method according to the present invention, when the underground retaining wall is sequentially removed from the lower end thereof, the retaining wall support pile 40 is supported in the ground because the amount of backfilling is sequentially made at the same time. The progression of the underground retaining wall removal construction is deeper and proportionally deeper, and the size of the load of the underground retaining wall supported by the retaining wall support pile 40 is time-dependent ( The progression becomes smaller proportionally.

On the other hand, the removal of the raker 32 and the disconnection of the retaining wall support pile 40 connection to the retaining wall (where the retaining wall 10 and the retaining wall support pile 40 are joined by the anchor bolt) are performed by the process described below. It is done when the retaining wall is removed and the soil refill is made by the height.

In this process, reference numeral 43 (FIG. 4C) denotes a flange portion of the retaining wall support pile 40 when the adhesion (welding) strength of the welding portion 45 to the connecting plate 44 of the retaining wall support pile 40 is insufficient. Represents a bolt fastened through.

Although the present process has been described as a case where the load of the underground retaining wall is large, for example, when the height of the underground retaining wall to be removed is two or more underground levels, it can be applied in consideration of safety even when the underground retaining wall is less than two underground levels. .

4th process: Order grouting  fair

The fourth step is not an essential step, but an additional step that can be selectively added as needed. When dry water flows to the outside of the underground retaining wall to be removed, the underground retaining wall 10 is sequentially moved upward from the lower end thereof. When removing by horizontal slicing, it is a process to prevent dry water inflow and loss of soil into the withdrawn underground space. FIG. 5A is a perspective view of the underground retaining wall from the inside of the underground retaining wall 10. The reference numeral 50 is an underground water level, and the reference numeral 52 indicates a hole drilled through the underground retaining wall 10 with a core drill for injecting the order grouting material. The filler 54 is pressurized through this filler injection hole 52 toward the outer side of the retaining wall. This order grouting material injection hole 52 may be used as a hole for fastening the steel core wire for lifting the underground retaining wall cutting block body to be described later.

FIG. 5B shows that when there is a free space necessary for construction outside the basement retaining wall, the ground is excavated in the vertical direction at the outer side of the retaining wall instead of the ordering process according to FIG. It is shown to be a hole.

5th process: Basement wall  Foundation floor removal process

If the underground retaining wall 10 is firmly supported by the raker pile 30 and the raker 32 as shown in FIG. 3B to prevent it from falling down and sinking, or in addition, the retaining wall 10 as shown in FIG. 4D. ) Is further supported by the underground retaining wall support pile 40, the foundation 20 remaining and attached to the lower end of the retaining wall is removed, as shown in FIG. This operation may be performed using a wheel sawing blade, or may be used in combination with a breaker such as a rock drill. This process removes all the foundation attached to the bottom of the retaining wall, and when the soil is filled in the removed portion, the following process is performed.

6th Step: Underground retaining wall  Bottom-up Sequential Removal and Sequential Landfill Process

7A to 7E illustrate the underground retaining wall bottom-up sequential removal and sequential landfill processes, which are the central processes of the present invention, and the above-described processes may be considered to correspond to preparation steps for carrying out the present process.

7A is a view showing how the core technical idea of the present invention is implemented. As shown, the retaining wall 10 is horizontally cut from the lower end by a predetermined width and removed by a wheel saw cutter blade. Earth and sand (S) is carried in in the removed site | part.

The retaining wall 10 is cut in a substantially rectangular shape by a predetermined width W2 and height H2 in the horizontal direction, preferably horizontal W2 × height H2 = 3 to 4 m × 1 to 1.2 m. It is separated from the base retaining wall matrix 10 in the form of a block 10B. Various cutters can be used as the means for cutting the underground retaining wall. Preferably, the wheel saw cutter is an equipment that can be used even when the cutting radius exceeds 70 cm while cutting concrete and reinforced concrete. ) Is useful at the moment. However, in the present invention, the tool used as the retaining wall cutting means is not necessarily limited to the wheel saw cutter, and in some cases, a wire saw cutter, a laser cutter, a water jet cutter, or the like may be used.

The wheel saw cutter is mounted on a separate horizontal rail mechanism that is installed in contact with the underground retaining wall, and is unmanned by remote control. Since the operating mechanism of the wheel saw cutter is well known as in the example already used in other fields such as bridge cutting, the detailed description thereof is omitted here.

FIG. 7B illustrates a height of the underground retaining wall cutting block 10B in advance before lifting the underground retaining wall cutting block 10B cut into a substantially rectangular shape by a back hoe or the like through a steel core wire (not shown). Soil filling (backfilling) time for the drawn space after drawing of the underground retaining wall cutting block 10B by preceding the soil refilling by a predetermined portion of H2), for example, (1/2) × H2. It is possible to reduce the energy loss as much as possible, and contributes to supporting the basement wall a little more stably during its removal.

In addition, FIG. 7B shows that the slicing angle is inclined toward the outer bottom of the retaining wall in order to facilitate the drawing work when the basement retaining wall is cut out by a predetermined height in the horizontal direction from the lower part as described above. It is shown. As can be seen from this figure, the cut surface of the basement retaining wall cutting block 10B is inclined downward by a predetermined angle θ toward the outer side of the retaining wall, so that the basement retaining wall cutting block body When it draws in the direction of arrow A1 by inclining a predetermined angle (for example, 30 degrees-45 degrees) inside a retaining wall, the inclination work becomes easy.

On the other hand, in drawing the upper end of the basement retaining wall cutting block 10B at a predetermined angle θ toward the inside of the retaining wall, for example, the inclined upper end of the basement retaining wall cutting block 10B is tilted forward by 45 °. The soil is filled in the back surface of the basement retaining wall cutting block 10B and then pulled back while pressing the basement retaining wall cutting block 10B back to an upright state before tilting forward. It is preferable to draw out the underground retaining wall cutting block 10B little by little while repeating the movement in the direction of arrow A2 several times depending on the soil.

7C shows that when the basement retaining wall cutting block 10B is viewed from the front, its shape is not rectangular, for example, the trapezoidal shape of the upper and lower narrow beams and the upper and lower beams alternate in the transverse direction. 7D to 7E illustrate the order of drawing the trapezoidal retaining wall cutting block bodies 10B thus alternately cut and the relationship with the amount of soil filling in relation to the drawing order. Drawing.

When the basement retaining wall cutting block 10B is cut in such a way that the trapezoidal shape of the upper and lower straits is alternately formed in the transverse direction, there are the following advantages. That is, as shown in FIG. 7D, the total earth and sand S refilling amount is approximately equal to the height of the underground retaining wall cutting block sieve 10B before first removing any one of the two alternately shaped cutting block sieves as shown in FIG. 7D. In the state of being filled to half (1/2) × H2 height, each of the adjacent underground retaining wall cutting block bodies (10B) is replaced with the upper and lower beam type underground retaining wall cutting block bodies (10B-1). Removed first, and as shown in FIG. 7E, backfill the soil (S) again as (2/3) × H2 to (3/4) × H2 of the height H2 of the underground retaining wall cutting block body 10B. After filling up to the height, the trapezoidal underground retaining wall cutting block body 10B-2 of the Sanggwang Strait can be removed secondarily. In this case, the upper and lower narrow type underground retaining wall cutting block bodies 10B-2, which are secondarily removed, are deeper than the upper narrow type underground retaining wall cutting block bodies 10B-1 having their first embedded depths. It is not a problem because the lower side embedded in the ground is shorter than the upper side because it is smaller in the force required for drawing. The differential construction of the shape and drawing order of the cutting block body, and the fill-up level of the soil is contributed to minimizing the opening area of the soil outside the retaining wall when the cutting block body 10B is drawn into the retaining wall. The result is a reduction in the amount of soil to be additionally charged and the time taken for filling after the drawing of the sieve, which contributes to supporting the bottom of the underground retaining wall quickly and stably in the ground.

On the other hand, the upper slicing surface is also shown in Fig. 7b at the time of the cross drawing and backfill differential charging between the above-mentioned Sanggwangha River Underground Retaining Wall Cutting Blocks 10B-1,2. As described above, it is preferable that the slicing angle be inclined at a predetermined angle θ toward the outer bottom of the retaining wall so that the base retaining wall cutting block body can be inclined at a predetermined angle inside the retaining wall to facilitate the pulling out of the retaining wall. Of course.

As soon as the cutting block is separated from the existing retaining wall and removed, the soil is refilled to at least the height of the retaining wall below the retained wall at the same time, and the equipment is compacted to prevent the soil from entering the retaining wall. Promote support for the ground beneath the retaining wall.

The process of removing the underground retaining wall by the sequential bottom-up slice method as shown in FIGS. 7F through 7I is gradually removed from the lower end thereof, and the backfill is sequentially sequentially removed by the height of the retaining wall at the same time. The raker 32, which was supporting the retaining wall in multiple stages as it is removed from the bottom, is also sequentially removed from the bottom raker and reinstalled to support the top if necessary, and the raker pile 30 when all the rakers are removed. Removed.

Specifically, FIG. 7G is used to support the retaining wall for the portion where the retaining wall has been removed while removing the bottom side raker, which is no longer needed for retaining wall support due to the soil filling in the process of FIG. 7F. Figure 7h shows the concept of drawing the raker pile, Figure 7h is further maintained in the mission of the process according to the progress of the process among the raker pile that was in charge of the retaining wall side with a high basement floor in the process of Figure 7g Figure 7i is a cross-sectional view showing the removal of the last remaining raker support pile as the raker plays a role, and Figure 7j is a removal of all the underground retaining wall Landfill vertically to the ground, with the soil filled to the ground line It is a sectional view showing that that it eventually drawn into an underground retaining wall supporting files that have been retained air.

7th Step: Underground retaining wall support pile Drawing Removal Process

After all of the sixth process is completed, all the underground retaining walls are removed, and at the same time, after the soil refilling is completed to the ground line, the underground retaining wall support pile 40 is finally drawn out and removed, thereby being shown in FIG. 8. As described above, in the ground of the site to be constructed, a bare land in a pure form without any obstacles is obtained, thereby completing the underground retaining wall removal construction by the construction method according to the present invention.

In the implementation of the method according to the present invention described above, the number and dimensions of structural members such as raker piles, rakers, or retaining wall support piles, calculation of underground root penetration of each pile, size and anchoring length of anchor bolts, connecting plates, etc. It is to be understood that each dimension, such as the length of the joint or the welded joint, the size of the cutting block, etc., may be determined by the exact structural design dimension according to the field conditions, and may be different from the dimensions exemplarily shown in the present specification. . This means that when applying the method characterized in that it is described in the claims of the present specification, accurate structural calculation must be supported according to the site conditions (building conditions, geological conditions, adjacent environmental conditions, etc.) of the object to be removed. It is meant that the scope of the present invention should not be construed as being limited to the physical absent dimensions, etc., which are presented by way of example herein.

 Underground retaining wall removal method as described above according to the present invention can eliminate the cumbersome work, such as overlapping the carry-in and over-export of the soil, and the internal excavation of the soil to be carried out compared to the existing earthquake construction can significantly shorten the air, the existing earthquake construction Compared to this, the construction cost can be reduced to a considerable level, and additional matters to be prepared in connection with the construction of the retaining wall, such as road use due to pile drilling outside the retaining wall, can be solved at once, and noise and other civil complaints can be blocked in advance. In addition, it can be usefully applied to difficult construction that is difficult to remove the underground retaining wall.

Claims (8)

A process of removing the internal structure of the underground retaining wall to remove the internal structure of the retaining wall except the underground retaining wall under earth pressure; A raker pile and a raker installation process (first step) that puts the raker pile in the ground of the space created by the removal of the structure inside the basement wall and hangs the retainer wall retainer on the raker pile to support the retaining wall; An underground retaining wall partial cutting step (second step) for cutting the underground retaining wall into a predetermined shape and size from a lower side thereof; And, By removing the base retaining wall cutting block body partially cut from the lower end of the retaining wall by the second step, and repeating the process of refilling the soil by at least the height at which the underground retaining wall cutting block body is removed, the base retaining wall is repeatedly formed. Sequential lifting of the underground retaining wall cutting block sieve to be removed from the bottom side upwards from the bottom side and backsoil sequential refilling (third step); Bottom-up sequential removal and sequential landfill method for removing the underground retaining wall comprising a. The method of claim 1, Bottom-up sequential removal and sequential reclamation method for removing the underground retaining wall, characterized in that the cutting of the underground retaining wall is made by a wheel saw cutter. The method of claim 1, The basement retaining wall support pile installation step of integrating the retaining wall support pile into the retaining wall at a predetermined interval after the first step and before the second process allows the base retaining wall supporting pile to support the vertical load of the retaining wall on the ground. Bottom-up sequential removal and sequential landfill method for removing the underground retaining wall, characterized in that. The method of claim 3, In the process of installing the base retaining wall support pile, the base retaining wall is formed by fastening a metal connecting plate of a predetermined shape to an anchor bolt inserted into a plurality of groups at a predetermined height interval to the underground retaining wall and vertically adhering to the retaining wall. The retaining wall and the retaining wall support pile are integrated by joining the support piles, while the lower end of the underground retaining wall support pile enters the ground and is supported by the ground so that the load of the retaining wall is transferred to the ground by the underground retaining wall support pile. Bottom-up Sequential Removal and Sequencing to Remove Retaining Walls. The method according to claim 3 or 4, Before attaching the retaining wall support pile to the retaining wall, the horizontal cut groove is formed with a predetermined interval in the vertical direction with respect to the vertical portion of the retaining wall where the retaining wall support pile is to be placed in advance, wherein the horizontal width of the horizontal cut groove is Bottom-up sequential removal and sequential landfill method for removing the underground retaining wall, characterized in that greater than the width of the retaining wall support pile. The method according to claim 3 or 4, The bottom-up sequential removal and sequential reclamation method for removing the underground retaining wall further comprising the step of drawing and removing the underground retaining wall support pile after completing the third step to the ground level. The method according to claim 1 or 3, Prior to the second step, drill a filler injection hole in the basement retaining wall or directly contact the retaining wall on the outer side of the retaining wall and drill the filler injection hole in the vertical direction in the ground, and through the filler refilling hole toward the outside of the retaining wall. Bottom-up sequential removal and sequential landfill method for removing the underground retaining wall, characterized in that the pressure injection process is further carried out. The method according to claim 1 or 3, According to the second step, the cutting block body in which the basement retaining wall is partially cut from the lower side into a predetermined shape and size is of a type in which the upper and lower trapezoids and the upper and lower trapezoids are alternately repeatedly formed in the horizontal direction, and the removal order thereof is removed. When the upper and lower trapezoidal cutting block bodies are first removed, and then the upper and lower trapezoidal trapezoids are removed, and when the upper and lower trapezoidal cutting block bodies are removed, Bottom-up sequential removal and sequential reclamation method for removing underground retaining walls characterized by a higher filling height.

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