Rapid pile pulling casing for SMW (soil mixing wall) construction method pile

Abstract

The utility model relates to the technical field of foundation pit supporting, in particular to an SMW (soil mixing wall) construction method pile rapid pulling pile casing which comprises a pile casing used for separating section steel from a concrete crown beam, the concrete crown beam is continuously arranged at the top of the section steel, the thickness of the pile casing is 6mm, the section steel is sleeved with the pile casing, a distance d is reserved between the pile casing and the section steel, the section steel is inserted into a three-shaft mixing pile, and the three-shaft mixing pile is inserted into the three-shaft mixing pile. The pile casing extends out of the bottom face and the top face of the concrete top beam, the upper end and the lower end of the profile steel extend out of the pile casing, and when the concrete top beam is poured, top beam steel bars placed in the concrete top beam are separated from the pile casing. According to the fast pile pulling protection cylinder for the SMW construction method pile, the section steel and the concrete crown beam are separated through the protection cylinder body, the section steel is sleeved with the protection cylinder body, and the distance exists between the protection cylinder body and the section steel; meanwhile, the pile casing extends out of the bottom face and the top face of the concrete top beam, the upper end and the lower end of the profile steel extend out of the pile casing, the profile steel and the concrete top beam are separated through the pile casing, the concrete top beam is prevented from being broken and chiseled when the profile steel is pulled out later, and the profile steel is conveniently pulled out.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit support, in particular to a quick-pulling pile casing for SMW construction method piles. Background Art

[0002] With the development and utilization of underground spaces such as subway stations, underground municipal roads, and underground shopping malls, most of the retaining structures used during construction are permanently buried underground. Under the premise of meeting engineering technical requirements, SMW piles are selected as retaining structures. They have the advantages of outstanding economic benefits, short construction period, strong water-proofing, and minimal impact on the surrounding environment.

[0003] The steel section insertion depth of SMW piles is generally less than that of mixed piles, and most of it can be recycled and reused. Once the fertilizer trough on the side of the foundation pit is essentially backfilled, the steel section extraction begins. This extraction faces significant frictional resistance between the mixed piles and the top beam. While construction measures such as applying a friction reducer to the steel section and wrapping the steel section inside the top beam with a soft plastic film can reduce this resistance to some extent, in actual construction, the steel section and the top beam form an integral unit, and the top beam may need to be broken to extract the steel section. This process is time-consuming, costly, and affects the backfilling of the fertilizer trough. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, a quick pile casing for SMW construction method piles is provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a quick pile extraction casing for SMW construction piles, including a casing used to separate the steel and the concrete crown beam, the concrete crown beam is continuously arranged on the top of the steel, the thickness of the casing is 6mm,

[0006] The casing is set outside the steel section with a distance d between it and the steel section. The steel section is inserted into the triaxial mixing pile.

[0007] The casing extends out of the bottom and top surfaces of the concrete crown beam, and the upper and lower ends of the steel section extend out of the casing.

[0008] When the concrete crown beam is poured, the crown beam reinforcement placed in the concrete crown beam is separated from the casing.

[0009] Furthermore, the distance between the casing and the bottom surface and the top surface of the concrete crown beam is 100 mm.

[0010] Furthermore, the range of the distance d is 8-10 mm.

[0011] Furthermore, the casing is made of polyethylene or polyvinyl chloride.

[0012] The beneficial effects of the utility model are as follows: the SMW construction method pile of the utility model can quickly pull out the pile casing, and the casing is used to separate the steel and the concrete crown beam; at the same time, the casing extends out of the bottom surface and the top surface of the concrete crown beam, and the upper end and the lower end of the steel extend out of the casing, and the casing separates the steel and the concrete crown beam, avoiding the concrete crown beam from being broken when the steel is pulled out in the later stage, and facilitating the extraction of the steel.

[0013] The casing is set outside the steel section and there is a distance between it and the steel section. When the steel section is pulled out later, the resistance is reduced and the recycling of the steel section is convenient. This method is simple to construct, shortens the construction period and saves construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the utility model before the crown beam reinforcement is placed;

[0017] Figure 3 This is a schematic diagram of the structure of the utility model after the crown beam reinforcement is placed;

[0018] Figure 4 This utility model Figure 3 Schematic diagram of the structure in the AA direction;

[0019] Figure 5 This utility model Figure 3 Schematic diagram of the structure in the middle BB direction;

[0020] Figure 6 It is a structural diagram of the casing of the utility model;

[0021] Figure 7 It is a structural diagram of the utility model steel section.

[0022] Numbers in the figure: 1. Concrete crown beam; 2. Three-axis mixing pile; 3. Steel section; 4. Casing; 5. Crown beam reinforcement. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Figure 1-Figure 7 The SMW pile quick extraction casing shown in the figure includes a casing 4 for separating the steel section 3 and the concrete crown beam 1. The concrete crown beam 1 is continuously arranged on the top of the steel section 3. The thickness of the casing 4 is 6 mm.

[0025] The casing 4 is sleeved outside the steel 3, and there is a distance d between it and the steel 3. The steel 3 is inserted into the triaxial mixing pile 2.

[0026] The casing 4 extends out of the bottom and top surfaces of the concrete crown beam 1, and the upper and lower ends of the steel 3 extend out of the casing 4.

[0027] When the concrete crown beam 1 is poured, the crown beam reinforcement 5 placed in the concrete crown beam 1 is separated from the casing 4.

[0028] The distance between the casing 4 and the bottom surface and the top surface of the concrete crown beam 1 is 100 mm.

[0029] The spacing d is in the range of 8-10 mm.

[0030] The casing 4 is made of polyethylene or polyvinyl chloride.

[0031] After the triaxial mixing pile 2 is completed, the section steel 3 is inserted; then, a 6mm thick polyethylene or polyvinyl chloride casing 4 is installed at the corresponding elevation before the concrete cap beam 1 is poured. Before pouring the concrete cap beam 1, a polyethylene or polyvinyl chloride casing 4 is installed outside the section steel 3 to isolate the section steel 3 from the concrete cap beam 1. The casing 4 extends 100mm from both the bottom and top surfaces of the concrete cap beam 1, and a gap of 8-10mm is left between the casing 4 and the section steel 3 to prevent the concrete cap beam 1 from being damaged when the section steel 3 is removed.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A quick-extraction pile casing for SMW piles, characterized by: It includes a casing (4) for separating the steel section (3) and the concrete crown beam (1), wherein the concrete crown beam (1) is continuously arranged on the top of the steel section (3), and the thickness of the casing (4) is 6 mm. The casing (4) is sleeved outside the steel section (3) and there is a distance d between the casing (4) and the steel section (3). The steel section (3) is inserted into the triaxial mixing pile (2). The casing (4) extends out of the bottom and top surfaces of the concrete crown beam (1), and the upper and lower ends of the steel section (3) extend out of the casing (4). When the concrete crown beam (1) is poured, the crown beam reinforcement (5) placed in the concrete crown beam (1) is separated from the casing (4).

2. The SMW pile quick extraction casing according to claim 1, characterized in that: The distance between the bottom surface and the top surface of the concrete crown beam (1) where the casing (4) extends out is 100 mm.

3. The SMW pile quick extraction casing according to claim 1, characterized in that: The range of the distance d is 8-10 mm.

4. The SMW pile quick extraction casing according to claim 1, characterized in that: The casing (4) is made of polyethylene or polyvinyl chloride.

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