KR20210053497A - Fileless-up wall demolition method - Google Patents

Abstract

The present invention relates to a method of removing an underground retaining wall without a pile which is a new underground retaining wall removal method suitable for earth-retaining construction capable of safe removal without structural problems even if, exceptionally, conventional wall H-piles are not retained. The method is used when a width is unavoidably unavailable on the boundary surface of the ground and an existing wall and a new wall are overlapped and used. A conventional underground structure removal method can remove an underground structure only when conventional wall H-piles are retained. The present invention, however, can remove an underground structure on the assumption that conventional wall H-piles are not retained, in other words, without piles. Also, micro-piles (bar diameter of 21.5cm) are installed to support post piles for removal and are connected by a core and a small drill. 2m×5m (horizontal×vertical) is removed when removing a wall. Left and right walls are alternately removed to retain intervals of at least 5m.

Description

Pile-up wall demolition method {FILELESS-UP WALL DEMOLITION METHOD}

The present invention relates to the field of civil engineering, and more particularly, to a non-pile lifted wall demolition method that enables underground demolition even when the existing wall H-pile does not exist in the demolition of an underground retaining wall of an earthen wall construction.

The following is the technology behind the no-pile lifting wall demolition method,

Domestic Patent Registration No. 1007362410000 (2007.06.29) It shows the structure and construction method of the'up-down sequential removal and sequential reclamation method for removing the underground retaining wall'.

Domestic Patent Registration No. 1007362410000 (2007.06.29) The description of the construction method for the'up-down sequential removal and sequential reclamation method for removing the underground retaining wall' is as follows.

1. It is premised that the existing wall H-pile exists.

2. First, drill a hole in the slab and install the central pile and corner pile.

3. Install jack supports on each floor for which the structural bill is designed.

4. Install strips and struts inside the wall.

5. Go down to the floor while removing the inner slab and column.

6. Place the post pile and corner pile on the top of the foundation.

7. When the foundation is demolished, the backfilling work and the wall dismantling are repeatedly carried out for each floor and climbed to the top.

8. After drawing the file in the top bare ground condition, hand it over to a civil engineering company.

The conventional demolition method having such a configuration is a method based on the premise that the existing wall H-pile remains. If the existing wall H-pile did not exist, underground demolition was impossible with the conventional demolition method.

In the past, after the construction of an underground building structure, it was dead (not drawn), but in recent years, about 50

% Of the existing wall H-pile survived, and the remaining 50% were previously drawn, so that the pile did not exist, and thus underground demolition was impossible, but the present invention enables underground demolition without a pile.

Domestic Patent Registration No. 1007362410000 (2007.06.29)'Upward sequential removal and sequential reclamation method for removing the underground retaining wall' also presupposes that the existing wall H-pile remains, so that the existing wall H-pile does not exist. In this case, underground demolition is virtually impossible.

Domestic patent registration number 1007362410000 (2007.06.29)'Up-down sequential removal and sequential reclamation method for removing underground retaining walls'

It is possible to carry out earth protection work such as CIP and SCW behind the existing wall building from the top, but it is used when there is inevitably no margin of boundary in the city area and the existing wall and the new wall are integrally overlapped.

Unlike the domestic patent registration number 1007362410000 (2007.06.29)'Upward sequential removal and sequential reclamation method for removing underground retaining walls', the no-pile lifting wall removal method is structurally This is to suggest a new underground retaining wall demolition method that enables safe underground demolition.

In order to achieve the above-described purpose, the pile-free lifting wall demolition method,

The following method is suggested for the demolition of the underground retaining wall in the earth protection work.

Domestic patent registration number 1007362410000 (2007.06.29) Conventional demolition methods such as the'up-down sequential removal and sequential reclamation method for removing the underground retaining wall' are based on the premise that the existing wall H-pile remains before construction, but the present invention The premise is that the existing wall H-pile does not exist before construction, that is, no pile.

Domestic Patent Registration No. 1007362410000 (2007.06.29) Conventional demolition methods such as the'up-down sequential removal and sequential reclamation method for removing the underground retaining wall' are used to support the post pile for demolition. Leave it, and let the civil engineering company handle it later. On the other hand, in the present invention, a micropile (bar diameter 21.5CM) is installed to support the post-pile for demolition, and a core and a small drill are used to connect it.

Domestic patent registration number 1007362410000 (2007.06.29) Conventional demolition methods such as the'up-down sequential removal and sequential reclamation method for removing the underground retaining wall' are intended to cover the earth pressure on the wall by retaining the H-pile and earth plate on the wall during the wall demolition step. It was demolished 7M high x 15M wide. On the other hand, since the present invention is a non-pile, the wall is demolished in width x length: 2M x 5M, and at this time, the left and right walls are removed at an oblique angle so as to remain at least 5M apart.

The no-pile lifted wall demolition method allows structurally safe underground demolition even if the existing wall H-pile does not exist unusually.

1 is a diagram showing a pile-free lifting type wall demolition method suitable for the demolition of an underground retaining wall in an earthen block construction,
1 is an enlarged cross-sectional view of the entire cross-sectional view and AA, which is a main part.
Figure 2 is a horizontal exploded view of the method of removing the pile wall.

I will explain in detail the construction method for the no-pile lifted wall demolition method step by step.

1. It is assumed that the existing wall H-pile does not exist.

2. First, drill a hole in the slab and install the central pile and corner pile.

3. Install jack supports on each floor for which the structural bill is designed.

4. Go down while removing the internal slab and internal miscellaneous materials.

In general, struts of 300×300×10×15 are used, but structural safety is provided by applying the PPS method using a steel pipe with a diameter of 800mm. In addition, the safety was improved by applying the structurally proven temporary facility earth protection method that has been used in general.

5. Remove the internal slabs and columns, and install walls and struts on each floor, going down from the 1st to the 6th floor.

6. To support the post pile for demolition, install a micropile (bar diameter 21.5CM) and connect it down using a core and a small drill. If the micropile is not installed, the foundation is left with a width x length: 1M x 1M. The civil engineering company will deal with it later.

7. Remove the foundation demolition with a wheel saw, core, and buster. At this time, load the waste from time to time.

8. Refill and pledge from time to time, and at the same time ascend while dismantling the belt and strut.

9. For the demolition of the basement wall after the basement foundation is removed, install the lower end of the wall and strut as low as possible in accordance with the design in line with no structural problems.

10. Width×length: When demolition in 2M×5M, the left and right walls should be removed at an angle so that they remain at least 5M apart.

The reason for this is as follows. In the past, since the wall covers the earth pressure with H-pile and earth plate preservation, it was demolished 7M high x 15M wide. However, since this method is a non-pile, it minimizes the earth pressure by reducing the width to height × width: 2M × 5M to prevent the collapse of the soil. Even if there is no pile behind the underground wall, the existing grouting is about 1M, so the earth pressure is partially covered. In addition, in the case of horizontal continuous demolition without H-pile and earth plate, there may be structural problems with earth pressure, so it is removed at an angle.

11. Immediately do backfilling and compaction continuously.

12. After carrying out the drawing work after the top bare ground, it is handed over to a civil engineering company.

1: Wall to be demolished
2: stairs
3: Post for demolition: 300×200 files
4: wall (soil)
5: Micropile/rod outer diameter: 21.5CM. Use a core and a small drill to connect it down. Alternatively, you can leave the base horizontal x length: 1M x 1M.
6: Dismantling and backfilling walls and struts while climbing
7: STRUT
8: Part of the existing non-pile wall removed
9: foundation demolition part
10: Center post pile and corner pile: 300×200
11: 100 TON jockey
12: stiffener
13: WALL
14: bracket

Claims (6)

Conventional methods for demolition of underground structures are all on the premise that piles remain on the wall, but on the contrary, in the case where piles do not exist on the wall,

Assuming that the existing wall H-pile does not exist before construction, first, a slab hole is drilled, the central pile and the corner pile are installed, and the jack support is installed on each floor for which the structural bill is designed (the first step);

A step of descending while removing the internal slab and internal miscellaneous materials (second step);

A step of removing the internal slabs and columns and installing walls and struts on each floor, and descending from the first step to the sixth floor (third step);

A step of installing a micropile (rod diameter 21.5CM) (fourth step);

A step of removing the foundation with a wheel saw, a core, and a buster, and at this time, while loading the waste from time to time, frequently backfilling and compacting, and dismantling the strip and strut while climbing up (Step 5);

The process of installing the bottom of the wall and strut as low as possible in accordance with the design without structural problems for the removal of the basement wall after the basement foundation is removed (Step 6);

Width x length: When demolition in 2M x 5M, the left and right walls are removed at an angle of at least 5M so that they remain at least 5M apart (the 7th step);

Immediately, after continuous work of backfilling and compaction, drawing work is performed after the top bare ground and handed over to a civil engineering company (Step 8)

Characterized in that it comprises a, non-pile lifting type wall demolition method suitable for the demolition of the underground retaining wall of the earthen construction.
The method according to claim 1,
In the second process, a strut of 300×300×10×15 is generally used, but the PPS method using a steel pipe with a diameter of 800 mm is applied to provide a sense of structural safety, and a structurally proven temporary facility that has been generally used. A non-pile lifted wall demolition method with improved safety by applying a construction method.
The method according to claim 1,
In the fourth step, a micropile (bar diameter 21.5CM) is installed to support the postpile for demolition, and the core and small drill are connected to it.If the micropile is not installed, the foundation is left with a width x length: 1M x 1M. Pile-up wall demolition method to be processed by civil engineering companies in the future.
The method according to claim 1,
In the 7th process, height x width: by reducing the width from 7M x 15M to 2M x 5M, the earth pressure is minimized to prevent the collapse of the soil.In addition, when the horizontal continuous demolition without H-pile and earth plate, there is a structural problem of earth pressure. As this may occur, a non-pile lifted wall demolition method that is removed at an angle.
The method according to claim 1 or 3,
In the fourth process, the foundation is removed with a wheel saw, core work, and buster work, and the center pile and corner pile are reinforced with 300×200 piles at the top and 21.5CM micro piles at the bottom. .
The method according to claim 1,
In the eighth process, a pile-up wall demolition method in which soil backfill, compaction, strip strip, and strut are dismantled from the bottom, go up to the ground, and finally the top bare ground (backfill) and then draw work.

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