Physical protection structure for underground rammed earth wall ruins in excavation area

Abstract

The utility model discloses an excavation area underground rammed earth wall ruin physical protection structure which comprises a fence arranged on the periphery of a rammed earth wall and a steel pipe curtain arranged below the rammed earth wall, the steel pipe curtain is supported by underpinning supporting beams, concrete entities are poured in steel pipes forming the steel pipe curtain, and the concrete entities are filled with concrete. The fence is composed of steel piles, and a waist beam hoop is arranged on the fence. According to the utility model, the enclosure is adopted, and the steel pipe curtain is adopted for supporting, so that the integrity of the rammed earth wall in the excavation area can be ensured, and the overall excavation of the underground foundation pit is not influenced. By adopting the waist beam hoops and the opposite-pulling steel bars, the stability of the fence during excavation of the foundation pit can be ensured; the steel pipes forming the steel pipe curtain are connected in a mortise and tenon joint mode, and the integrity of the steel pipe curtain can be guaranteed. The underground rammed earth wall ruins are good in integrity and high in practicability, and the problem of protection of the underground rammed earth wall ruins can be effectively solved when foundation pit earth excavation is carried out under the condition that the underground water level is high.

Description

Technical Field

[0001] The utility model relates to a physical protection structure for earthen ruins, in particular to a physical protection structure for rammed earth city wall ruins in an excavation area. Background Art

[0002] In recent years, the cultural relics protection industry has been implementing preventive protection. At present, conventional rammed earth wall site protection structures are generally aimed at the protection of wall sites above the ground. When the rammed earth wall is located below the ground, and due to the construction of a subway station nearby, this part of the wall will be exposed during the excavation stage, so an appropriate protection structure is required to protect the rammed earth wall of the site without affecting the overall excavation of the underground foundation pit. Utility Model Content

[0003] The utility model provides a protection structure for solving the technical problems existing in the known technology, which can protect the rammed earth walls of earthen ruins and does not affect the overall excavation of underground foundation pits.

[0004] The utility model adopts a technical solution to solve the technical problems existing in the known technology: a physical protection structure for underground rammed earth wall ruins in an excavation area, the structure comprising an enclosure arranged around the rammed earth wall and a steel pipe curtain arranged below the rammed earth wall, the steel pipe curtain is supported by a supporting beam, concrete entities are poured in the steel pipes constituting the steel pipe curtain, the enclosure is composed of steel piles, and a waist beam clamp is provided on the enclosure.

[0005] A light well point dewatering well is provided in the enclosure.

[0006] The underpinning support beam is formed by adopting the inner support of the foundation pit.

[0007] The steel piles constituting the enclosure are made of channel steel.

[0008] The channel steel piles constituting the enclosure are interlocked with each other.

[0009] The waist beam hoop is made of channel steel and is provided with tension steel bars.

[0010] The tensioning steel bars are made of finely rolled threaded steel bars, and lock nuts threadedly connected to the ends of the tensioning steel bars are provided, and a steel pad is provided at the bottom of the lock nuts.

[0011] The steel pipe curtain is composed of square steel pipes.

[0012] The square steel pipes constituting the steel pipe curtain are connected by a mortise and tenon structure.

[0013] The underpinning support beam adopts a steel-concrete structure, and a beam top embedded plate is provided on the underpinning support beam. The beam top embedded plate is welded and fixed to the steel pipe curtain.

[0014] The advantages and positive effects of the utility model are: by adopting enclosures for protection and steel pipe curtains for support, the integrity of the rammed earth walls in the excavation area can be ensured without affecting the overall excavation of the underground foundation pit. By adopting waist beam hoops and their tensioning steel bars, the stability of the enclosure during the excavation of the foundation pit can be ensured; the steel pipes constituting the steel pipe curtain are connected by mortise and tenon joints to ensure the integrity of the steel pipe curtain. In addition, the utility model has good integrity and strong practicality, and can effectively solve the problem of protecting the underground rammed earth wall ruins during the excavation of the foundation pit under the condition of high groundwater level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic plan view of the upper structure of the utility model;

[0016] Figure 2 It is a schematic plan view of the lower structure of the utility model;

[0017] Figure 3 It is a longitudinal sectional view of the utility model;

[0018] Figure 4 It is a transverse cross-sectional view of the utility model.

[0019] In the figure: 1-rammed earth wall, 2-channel steel piles, 3-waist beam hoop, 4-tension steel bars, 5-light well point dewatering well, 6-steel pipe curtain, 7-replacement support beam, 8-steel pad, 9-original soil. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0021] See also Figure 1 to Figure 4 The rammed earth wall 1 is located below the ground in the excavation area and is an object that needs to be protected as a site. Its integrity needs to be ensured during the underground excavation stage. Below the rammed earth wall 1 is the original soil 9. The utility model provides a physical protection structure for the rammed earth wall 1, which includes an enclosure arranged around the rammed earth wall 1 and a steel pipe curtain 6 arranged below the rammed earth wall 1. The steel pipe curtain 6 is supported by a supporting beam 7. Concrete entities are poured into the steel pipes constituting the steel pipe curtain 6. The enclosure is composed of steel piles, and a waist beam clamp 3 is provided on the enclosure.

[0022] In this embodiment, a light well point dewatering well 5 is provided in the enclosure to ensure that the water level of the earthen site is lowered to the set position during excavation. The underpinning support beam 6 is formed by the internal support of the foundation pit. The joint design is adopted, and the internal support of the foundation pit is borrowed, the structure is simple, and the cost of structural construction can be reduced. The steel piles constituting the enclosure are made of channel steel, which is light in weight, high in strength, and convenient for construction. The channel steel piles 2 constituting the enclosure are interlocked with each other, and the connection reliability is good. The waist beam hoop 3 is made of channel steel and is provided with tension steel bars 4, which can further ensure the stability of the enclosure during the excavation of the underground soil. The tension steel bars 4 are made of finely rolled threaded steel bars, and the longitudinal and transverse strengths are higher than those of ordinary steel bars. A lock nut threadedly connected to the end of the tension steel bar 4 is provided, and a steel pad 8 is provided at the bottom of the lock nut. The steel pipe curtain 6 is composed of square steel pipes, and the flatness is good, which is convenient for ensuring the integrity of the rammed earth wall during the excavation stage. The square steel tubes constituting the steel tube curtain 6 are connected by mortise and tenon structures to ensure the integrity of the steel tube curtain. The underpinning support beam 7 is a steel-concrete structure, and a beam top embedded plate is provided on the underpinning support beam 7. The beam top embedded plate is welded and fixed to the steel tube curtain 6 to ensure the stability of the steel tube curtain.

[0023] A more detailed description is as follows:

[0024] The channel steel piles 2 are the main enclosure components of the rammed earth wall 1. Before the construction of the channel steel piles 2, a rotary drilling machine can be used to drill holes. After drilling, the holes are backfilled with soil. The channel steel piles 2 are connected by bite locks. The waist beam hoops 3 made of channel steel and the tension steel bars 4 made of finely rolled threaded steel bars are used to stabilize the transverse components of the channel steel piles 2. Multiple hoops can be set according to the height of the channel steel piles 2. The transverse waist beam hoops 3 and tension steel bars 4 are constructed as the excavation progresses.

[0025] The light well point dewatering well 5 is a device for lowering the groundwater level in the protected earthen ruins during excavation. The light well point dewatering well 5 can be made of 50mm PVC pipes, and the length of a single pipe is 6m.

[0026] The steel tube canopy 6 is a component for supporting the bottom of the rammed earth wall 1. A steel tube curtain 6 is arranged below the rammed earth wall 1. The steel tubes constituting the steel tube curtain 6 are connected by mortise and tenon joints.

[0027] The underpinning support beam 7 is a bottom support member of the steel pipe curtain 6 and is formed by supporting in the foundation pit.

[0028] Construction method of the above protection structure:

[0029] 1) Use a rotary drilling machine to drill holes continuously along the periphery of the rammed earth wall 1, and backfill the holes with plain soil after drilling.

[0030] 2) A high-frequency hydraulic pile driver is used to vertically press the channel steel piles 2 along the circumference of the rammed earth wall 1 to form continuous channel steel piles 2. The channel steel piles 2 are connected by bite locks, and the continuous channel steel piles 2 constitute the enclosure of the rammed earth wall.

[0031] 3) Excavate and remove the topsoil, cut off the upper end of the channel steel pile 2 to the designed elevation, and construct the first waist beam hoop 3 and tension steel bar 4.

[0032] 4) Light well point dewatering well 5 within the construction enclosure.

[0033] 5) Excavate the surrounding earthwork and construct the waist beam hoop 3 and tension steel bar 4 as the excavation progresses.

[0034] 6) Continue earth excavation and construct the replacement support beam 7.

[0035] 7) After the construction of the underpinning support beam 7 is completed, the steel pipe curtain 6 is constructed by jacking, and the square steel pipes are connected by mortise and tenon joints. The size of the square steel pipe is 500*500mm, the wall thickness is 16mm, and the interior is filled with concrete.

[0036] 8) After the construction of the steel tube curtain 6 is completed, the protection structure of the underground rammed earth city wall ruins is completed, and the next step of earth excavation can be carried out.

[0037] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. A physical protection structure for underground rammed earth city wall ruins in an excavation area, characterized in that: The structure includes an enclosure arranged around the rammed earth wall and a steel pipe curtain arranged below the rammed earth wall. The steel pipe curtain is supported by a supporting beam. Concrete entities are poured in the steel pipes constituting the steel pipe curtain. The enclosure is composed of steel piles, and a waist beam clamp is provided on the enclosure.

2. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 1 is characterized in that: A light well point dewatering well is provided in the enclosure.

3. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 1 is characterized in that: The underpinning support beam is formed by adopting the inner support of the foundation pit.

4. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 1 is characterized in that: The steel piles constituting the enclosure are made of channel steel.

5. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 4 is characterized in that: The channel steel piles constituting the enclosure are interlocked with each other.

6. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 1, characterized in that: The waist beam hoop is made of channel steel and is provided with tension steel bars.

7. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 6 is characterized in that: The tensioning steel bars are made of finely rolled threaded steel bars, and lock nuts threadedly connected to the ends of the tensioning steel bars are provided, and a steel pad is provided at the bottom of the lock nuts.

8. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 1 is characterized in that: The steel pipe curtain is composed of square steel pipes.

9. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 8, characterized in that: The square steel pipes constituting the steel pipe curtain are connected by using a mortise and tenon structure.

10. The physical protection structure for underground rammed earth city wall ruins in the excavation area according to claim 9, characterized in that: The underpinning support beam adopts a steel-concrete structure, and a beam top embedded plate is provided on the underpinning support beam. The beam top embedded plate is welded and fixed to the steel pipe curtain.

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