Recyclable combined long and short pile steel continuous wall

Abstract

The invention discloses a recoverable combined long and short pile steel continuous wall which comprises HC construction method piles which are of I-shaped strip-shaped structures and comprise first plate bodies, second plate bodies and third plate bodies. The PC construction method pile is of a circular tube structure; the Larsen steel sheet pile is movably connected with the PC construction method pile; the pile head is movably connected with the HC construction method pile; the plurality of Larsen steel sheet piles are reversely and movably connected; and the multiple connecting pieces are arranged on the HC construction method piles and the PC construction method piles. According to the recoverable combined long and short pile steel continuous wall, the soil retaining and water stopping functions of the steel continuous wall can be achieved, the deformation resistance of the steel continuous wall is improved, the foundation pit engineering requirement of a complex environment is met, disturbance generated during recovery is reduced, the supporting strength effect is improved, and the recoverable combined long and short pile steel continuous wall is large in supporting rigidity, good in stress performance and reliable in quality; the construction speed is high, the environmental influence is small, the application range is wider, and economic benefits are good.

Description

Technical Field

[0001] The invention relates to the field of continuous wall support, in particular to a recyclable combined long and short pile steel continuous wall. Background Art

[0002] Foundation pit engineering and cofferdam engineering are widely used in urban construction engineering, subway engineering, underground comprehensive pipeline corridor engineering and other fields.

[0003] The following are commonly used in foundation pit projects: underground continuous wall, which has good integrity and impermeability, and is suitable for various geological conditions, especially soft soil layers and areas with high groundwater levels; steel sheet piles, which have the characteristics of fast construction speed and high reusability, and are suitable for shallow foundation pits or temporary supports; bored cast-in-place piles, which are formed by pouring concrete into the holes after drilling and installing steel cages, and can provide strong supporting capacity when used for retaining structures; SMW method piles, which combine the advantages of steel and cement soil mixing piles to form a support structure that has both earth-retaining and anti-seepage functions. It uses a multi-axis mixing pile machine to drill to a certain depth on site, and at the same time mixes cement slurry with the foundation soil to form a cement soil wall with a certain strength. H-shaped steel is inserted before the cement soil hardens to improve the bearing capacity and stability of the wall.

[0004] The connection between the existing technical piles is not airtight enough. The SMW piles are connected by piles of different diameters, and the construction quality of the water-stop curtain is difficult to control, and leakage often occurs. There is a large amount of mud in the construction process of bored piles, which is buried underground after use, and has a great impact on the underground environment. The PC piles are a combination of steel pipe piles and Larsen steel sheet piles. Since there are not many specifications of PC steel pipe piles on the market, the quality of on-site welding is difficult to guarantee and the construction period is long. The transportation of extra-long steel pipe piles processed and welded in the factory is difficult and expensive. The HC piles are a combination of H-shaped steel and Larsen steel sheet piles, which have better water-stopping and acceptable force. There are many specifications of H-shaped steel on the market, the on-site welding quality of H-shaped steel is reliable, and the transportation cost is not high. However, the overall stiffness of H-shaped steel is weaker than that of steel pipe piles, and it is easy to twist or tilt during construction, which further leads to a low overall stiffness.

[0005] In general, the existing technologies all have different technical problems, and therefore a solution that can meet different needs is needed.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a recyclable combined long and short pile steel continuous wall, which can solve the problems existing in the background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides a recyclable combined long and short pile steel continuous wall, characterized in that it includes: HC construction piles, the HC construction piles are I-shaped strip structures, including a first plate body, a second plate body and a third plate body, the second plate body is located at the center of the HC construction piles; the third plate body is vertically arranged with the second plate body and fixed on the inner side of the second plate body; the first plate body is vertically arranged with the second plate body and fixed on the outer side of the second plate body; PC construction piles, the PC construction piles are circular tubular structures; Larsen steel sheet piles, the Larsen steel sheet piles are movably connected with the PC construction piles; movably connected with the HC construction piles; a plurality of the Larsen steel sheet piles are reversely connected and movably connected; connectors, a plurality of the connectors are arranged on the surfaces of the HC construction piles and the PC construction piles.

[0009] In one or more embodiments, a baseline is further included, and the baseline is located at the outer edge of a preset foundation pit of the foundation pit project, and the shape of the baseline is matched with the preset foundation pit of the project.

[0010] In one or more embodiments, the connecting member is located on the baseline, and the connecting member is a locking structure.

[0011] In one or more embodiments, the third plate long end of the HC method pile is connected to the connecting member.

[0012] In one or more embodiments, the base line passes through the center of the PC method pile, and the connecting member is arranged at the intersection of the PC method pile and the base line.

[0013] In one or more embodiments, the length of the HC construction method pile is greater than the length of the PC construction method pile.

[0014] In one or more embodiments, a plurality of the connectors are movably connected.

[0015] In one or more embodiments, the connection method of the PC method piles, HC method piles and the Larsen steel sheet piles can be adopted but not limited to: wherein the number ratio of the short pile PC method piles to the long pile HC method piles can be 1:1 and 1:2, etc.

[0016] In one or more embodiments, when the short pile PC method pile and the long pile HC method pile adopt the "insert one jump one" method, the diameter of the short pile PC method pile is 630 mm, the wall thickness is 14 mm, and the spacing is 1860 mm. The model of the long pile HC method pile is H700*300*13*24, the spacing is 1860 mm, the steel grade of the short pile PC method pile is Q335, the steel grade of the long pile HC method pile is Q235, the model of the Larsen steel plate is hot-rolled U400-170, the spacing is 400 mm, and the steel grade of the Larsen steel plate is Q335.

[0017] Compared with the prior art, the multiple technical solutions and embodiments provided by the present invention have at least the following technical effects or advantages:

[0018] 1. All connectors are uniformly set on the baseline to provide clear division of construction pile positions, evenly bear outward pressure, and the connectors are arranged in a straight line. When subjected to pressure, a single connector has a tendency to deform, which can be dispersed to adjacent connectors, thereby improving the force-bearing capacity;

[0019] 2. Provide multiple options with different structural strengths, different combinations of long and short piles, and different spacings. It has excellent scalability and provides different installation methods according to needs to meet the needs of foundation pit engineering in complex environments; 3. Set the HC method piles higher than the top beam to reduce the disturbance caused by recycling according to the process during recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and can be considered as illustrative of various combinations of preferred embodiments and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the overall structure of a recyclable combined long and short pile steel continuous wall provided by the present invention;

[0022] Figure 2 The present invention provides Figure 1 A schematic diagram of a connection structure of a recyclable combined long and short pile steel continuous wall with a PC construction method pile and a HC construction method pile in a 1:1 ratio provided by the present invention;

[0023] Figure 3 The present invention provides Figure 1 A schematic diagram of a connection structure of a recyclable combined long and short pile steel continuous wall with a PC construction method pile and a HC construction method pile in a ratio of 2:1 provided by the present invention;

[0024] The numbers in the figure represent: 1-HC construction pile, 11-first plate, 12-second plate, 13-third plate, 2-PC construction pile, 3-Larsen steel sheet pile, 4-connector, 5-baseline, 6-cement soil pile wall. DETAILED DESCRIPTION

[0025] Unless explicitly stated otherwise, throughout the specification and claims, the term "comprise" or its variations such as "include" or "comprising", "made of", etc. will be understood to include the stated elements or components but not to exclude other elements or other components.

[0026] The purpose of the present invention is to provide a recyclable combined long and short pile steel continuous wall, which can meet complex engineering requirements, reduce disturbances caused by recycling, and improve structural strength.

[0027] Embodiment 1:

[0028] The present embodiment provides a recyclable combined long and short pile steel continuous wall, characterized in that it includes: HC construction pile 1, the HC construction pile 1 is an I-shaped strip structure, including a first plate 11, a second plate 12 and a third plate 13, the second plate 12 is located at the center of the HC construction pile 1; the third plate 13 is vertically arranged with the second plate 12 and fixed on the inner side of the second plate 12; the first plate 11 is vertically arranged with the second plate 12 and fixed on the outer side of the second plate 12; PC construction pile 2, the PC construction pile 2 is a circular tubular structure; Larsen steel sheet pile 3, the Larsen steel sheet pile 3 is movably connected with the PC construction pile 2; and is movably connected with the HC construction pile 1; a plurality of the Larsen steel sheet piles 3 are reversely connected and movably connected; and a connector 4, a plurality of the connectors 4 are arranged on the surface of the HC construction pile 1 and the PC construction pile 2. Preferably, it also includes a baseline 5, the baseline 5 is located at the outer edge of the preset foundation pit of the foundation pit engineering, and the shape of the baseline 5 is arranged in coordination with the preset foundation pit of the engineering.

[0029] Specifically, in order to enhance the supporting rigidity of the foundation pit and increase the water-stopping performance, this embodiment provides a recyclable combined long and short pile steel continuous wall, such as Figure 1 , 2As shown in Figures 3 and 4, the HC construction method pile 1 is an I-shaped strip structure, and its long side is arranged perpendicular to the ground; in the I-shaped cross section of the HC construction method pile 1, the long side of the third plate body 13 is arranged on the baseline 5. Further, the connection mode of the HC construction method pile 1 is that the two ends of the third plate body 13 are connected, and the center of gravity of the HC construction method pile 1 itself is biased to the outside, driving the overall center of the recyclable combination of long and short piles and steel continuous wall away from the baseline to the outside. When the recyclable combination of long and short piles and steel continuous wall is subjected to inward water and soil pressure, due to the presence of the connecting member 4 located on the baseline, the HC construction method pile is prevented from twisting, thereby improving stability and increasing support stiffness; the PC construction method pile 2 is set to be cylindrical, and its long side is perpendicular to the ground. Due to the presence of the connecting member 4 located on the baseline, the center of gravity of the HC construction method pile 1 itself is biased to the outside, driving the overall center of the recyclable combination of long and short piles and steel continuous wall away from the baseline to the outside, thereby improving the stiffness and force-bearing performance of the combination of long and short piles and steel continuous wall through the structure; Figure 2 , 3 As shown, the Larsen steel sheet pile 3 is movably connected with the HC method pile 1 and the PC method pile 2. The Larsen steel sheet pile 3 improves manufacturing efficiency by using a unified connector 4. The connection between the Larsen steel sheet piles 3 requires reverse cooperation of the connector 4, so a reverse connection is used to improve structural strength.

[0030] As a preferred implementation of this embodiment, the connector 4 is located on the baseline 5, and the connector 4 is a lock structure. Specifically, by uniformly arranging all the connectors 4 on the baseline 5 for connection, a surface with better force is provided, so that a recyclable combined long and short pile steel continuous wall can evenly bear the water and soil pressure on the outside.

[0031] As a preferred implementation of this embodiment, the long end of the third plate 13 of the HC method pile 1 is connected to the connecting member 4 .

[0032] As a preferred implementation of this embodiment, the baseline 5 passes through the center of the PC construction pile 2, and the connecting member 4 is arranged at the intersection of the PC construction pile 2 and the baseline 5. Specifically, in order to facilitate the PC construction pile 2 to evenly bear the water and soil pressure, the baseline 5 passes through the center of the PC construction pile 2 so as to provide a circular arc stress surface with the longest length.

[0033] As a preferred implementation of this embodiment, the length of the HC method pile 1 is greater than the length of the PC method pile 2. Specifically, when constructing the recyclable combined long and short pile steel continuous wall, preferably, the PC method pile 2 is first implanted, and then the Larsen steel sheet pile 3 connected to the PC method pile 2 is implanted, and finally the HC method pile 1 is implanted, and then the Larsen steel sheet pile 3 connected to the HC method pile 1 is implanted, so as to form a long and short pile steel continuous wall with good overall water-stopping effect, good force-bearing performance and high support stiffness.

[0034] As a preferred implementation of this embodiment, a plurality of connecting members 4 are movably connected.

[0035] Preferably, the connector 4 is a small tongue-and-groove lock buckle, which is a columnar structure with a hook-shaped cross section. When the two small tongue-and-groove lock buckles are centrally symmetrically butted against each other, the tenon is inserted into the groove to achieve connection. The sealing structure achieved by the two tongues is simple and easy to install and disassemble. Compared with the traditional sealing method, the tongue-and-groove seal has better reusability and reliability, and is suitable for a variety of media, including liquids and solid particles. Among them, the small tongue-and-groove lock buckle in the Larsen steel sheet pile 3 is its inherent structure; the small tongue-and-groove lock buckle set in the PC method pile 2 opens outward; the lock buckle set in the HC method pile 1 opens on one side outward and on the other side inward, which is a symmetrical structure; the lock buckle of the PC method pile 2 is connected to the Larsen steel sheet pile 3 in a manner that the Larsen steel sheet piles 3 on both sides are axially symmetrically arranged, and the lock buckle of the HC method pile 1 is connected to the Larsen steel sheet pile 3 in a manner that the Larsen steel sheet piles 3 on both sides are centrally symmetrically arranged, and the Larsen steel sheet piles 3 on both sides of the HC method pile have different opening directions. This setting is conducive to providing a variety of ways to combine Larsen piles, and can match the odd and even number settings of Larsen piles. The reason is that the shape of Larsen piles is fixed, and the connection between Larsen piles requires a small tongue and groove lock to be connected. Therefore, the HC method piles are set with the small tongue and groove lock openings in opposite directions, which can realize any number of multiple retaining pile plug-in methods, making it easy to provide retaining solutions of any length that can meet any requirements according to construction requirements.

[0036] The small tongue-and-groove connection can reliably transmit the forces such as tension, pressure, shear, bending moment and torque when the water and soil pressure inside and outside are unbalanced after the excavation of the foundation pit; after the foundation pit is backfilled, when the unbalanced water and soil pressure inside and outside is basically relieved, the friction can be overcome along the vertical direction of the small tongue-and-groove and the combined long and short pile steel continuous wall can be separated in time and easily recovered. The recyclable combined long and short pile steel continuous wall is used to control the deformation of the foundation pit, and the long pile HC method pile is used to control the foundation pit in a stable state.

[0037] As a preferred implementation manner of this embodiment, the connection method of the PC method piles 2, the HC method piles 1 and the Larsen steel sheet piles 3 can be adopted, but not limited to: close insertion, insertion one jump one and insertion one jump two; wherein, the ratio of the number of the short pile PC method piles to the long pile HC method piles can be 1:1 and 1:2, etc.

[0038] Specifically, this embodiment provides a variety of connection methods for construction piles, such as Figure 2 , 3 As shown, the connection mode of the PC construction pile 2, the HC construction pile 1 and the Larsen steel sheet pile 3 can be adopted, but not limited to: close insertion, insertion one jump one and insertion one jump two, and the number ratio of the PC construction pile 2 and the HC construction pile 1 can be 1:1 and 1:2, etc. It provides a variety of options with different structural strengths, different combinations of long and short piles and different spacings to meet the needs of foundation pit engineering in complex environments.

[0039] As a preferred implementation mode of this embodiment, the HC method pile 1 is higher than the top beam by more than 50 cm. The HC method pile 1 is first recovered by static pulling, and then the top beam is broken, and then the PC method pile 2 is recovered without resonance, and finally the Larsen steel sheet pile 3 is recovered without resonance. The purpose is that soil disturbance caused by recovery will cause environmental problems, and vibration and other factors will damage the main structure. By adopting this implementation mode, the vibration and disturbance generated during recovery are minimized.

[0040] As a preferred implementation of this embodiment, the HC construction method piles, PC construction method piles, and Larsen steel sheet piles are constructed by resonance-free vibration hammers and static pressure; the top of the Larsen steel sheet piles is anchored into a reinforced concrete top beam for casting, and the tops of the HC construction method piles and PC construction method piles are cast by reinforced concrete top beams; when the surrounding environmental protection requirements are high or the foundation soil is relatively good, the short pile PC construction method piles and the long pile HC construction method piles are both provided with a number of grouting pipes, and non-soil forced mixing or high-pressure water injection grouting with the grouting pipes is used to pre-drill holes and mix 5 -10% cement content; when the project has higher requirements for water stopping or the silt sand layer is thick, prefabricated cement soil pile wall 6 equipment is set according to the design requirements, and the prefabricated cement soil pile wall 6 equipment includes but is not limited to: single-axis and double-axis equipment for axial mixing, three-axis and multi-axis equipment, channel cutting TRD equipment and radial cutting double-wheel milling CSM equipment; the cement soil pile wall 6 equipment is pre-piled or grooved and enters a relatively deep or hard rock and soil layer to form a cement soil pile wall 6, and the combined long and short pile steel continuous wall is implanted before the cement soil pile wall 6 solidifies.

[0041] Specifically, during the implementation of the project, the short PC method piles are first laid out according to the drawings, then the Larsen piles are constructed, and then the long HC method piles are constructed. They are implanted in sequence, and all three are connected by small tongue and groove connections. Preferably, the construction is carried out by resonance-free vibration hammers and static pressure, which reduces the adverse environmental impact during construction and provides an environmentally friendly construction strategy. The tops of the short PC method piles, the long HC method piles and the Larsen steel sheet piles can be cast with reinforced concrete top beams to form an integrated structure to increase the overall force. The upper part of the Larsen pile is anchored into the top beam by 50 mm to enhance the water-stopping effect. The HC method piles are more than 50 cm higher than the top beam, which is convenient for first recovering the long HC method piles by static pulling to reduce the adverse effects of recovery.

[0042] The present embodiment provides an embodiment for further increasing the beneficial effects. First, for areas with high requirements for surrounding environmental protection or relatively good foundation soil such as old clay layer hard soil, iron plate sand, pebbles and rocks, in order to further reduce the environmental impact, when setting the retaining piles, the short pile PC method piles and the long pile HC method piles are both provided with a plurality of grouting pipes, and non-soil forced mixing or high-pressure water injection grouting with the grouting pipes can be used to pre-drill holes and add 5-10% cement content; when the retaining piles are recovered; the short pile PC method piles, the long pile HC method piles and the Larsen steel sheet piles are immediately grouted using the grouting pipes, and the cement content of the grouting is 5-10%. Therefore, the recyclable combined long and short pile steel continuous wall is a supporting pile that is both economical and reliable, has strong soil adaptability and is environmentally friendly.

[0043] Secondly, for projects with higher requirements for water stopping or deep silt soil layers, the cement soil pile wall 6 equipment can be pre-pile or grooved according to the design requirements and a certain amount of cement can be added. The pre-formed cement soil pile wall 6 equipment includes single-axis and double-axis equipment for axial mixing, three-axis and multi-axis equipment, channel cutting TRD equipment and radial cutting double-wheel milling CSM equipment and other pre-mixing or grooved equipment. The cement soil pile wall equipment is pre-pile or grooved and enters a relatively deep or hard rock and soil layer to form a cement soil pile wall 6. For the connection tongue and groove, The existing joints can be sealed, and the combined long and short pile steel continuous wall is implanted before the cement soil pile wall 6 solidifies; when the retaining piles are recovered, in order to increase the recovery progress and speed, a friction reducer is applied within the range of the combined long and short pile steel continuous wall, and the amount of the friction reducer is 0.1-1.1 kg per square meter. A cement content of 0-10% of the reinforced soil mass is added within the range of the recyclable combined long and short pile steel continuous wall to form a recyclable combined long and short pile steel continuous wall with dual reliable water stopping and soil retaining, while taking into account the recovery speed.

[0044] As a preferred implementation manner of this embodiment, when the short pile PC method piles and the long pile HC method piles adopt the "insert one jump one" method, the diameter of the short pile PC method piles is 630 mm, the wall thickness is 14 mm, and the spacing is 1860 mm. The model of the long pile HC method piles is H700*300*13*24, the spacing is 1860 mm, the steel grade of the short pile PC method piles is Q335, the steel grade of the long pile HC method piles is Q235, the model of the Larsen steel plate is hot-rolled U400-170, the spacing is 400 mm, and the steel grade of the Larsen steel plate is Q335. Preferably, when selecting materials, the PC method piles and the Larsen steel plates can be selected from any alternative with a steel grade not less than Q355, and the long piles HC method piles can be selected from any alternative with a steel grade not less than Q255; preferably, when selecting models, the long piles HC method piles are of models H700*300*13*24, and the long piles HC method piles are of models H800*300*14*26; the short piles PC method piles have a diameter of 630mm and a wall thickness of 14mm, the short piles PC method piles have a diameter of 820mm and a wall thickness of 14mm, the short piles PC method piles have a diameter of 915mm and a wall thickness of 14mm; the Larsen steel plate model can select hot-rolled U400-170 or U600-210 steel sheet piles to facilitate adaptation to different engineering requirements.

[0045] Specifically, according to the field practice of the present invention, the supporting stiffness of the recyclable combined long and short pile steel continuous wall is about 2.27 times that of the short pile PC method pile (when "insert one jump one", calculated per linear meter), which can reduce the deformation of the retaining pile by about 35%. Reducing the deformation of the retaining pile helps to avoid the jamming phenomenon when the retaining pile is recovered, which is convenient for the smooth completion of the project; the maximum bending moment of the recyclable combined long and short pile steel continuous wall is 1.8 times the maximum resistance bending moment of the short pile PC method pile (when "insert one jump one", calculated per linear meter); the steel content per linear meter is basically unchanged, and then the long pile HC method pile can be statically pulled and recovered first in the later recovery; the short pile PC method pile, the long pile HC method pile and the Larsen steel sheet pile are combined into long and short piles, which achieves the technical effects of high stiffness, easy recovery and good economic benefits compared with the prior art. Those skilled in the art can realize the implementation methods including dense insertion, insert one jump two, etc. without objection according to the means of inserting one jump one in this embodiment, and achieve the same technical effect, which will not be described in detail here.

[0046] Furthermore, the advantages of using long HC method piles 1 and short PC method piles 2 in terms of force and construction are: the long PC method piles 2 are difficult to process and transport, and the increase in length will increase the difficulty of implantation and recovery, so short piles with better effects are used as the preferred implementation method; the weight per meter of the HC method pile 1 is lower than that of the PC method pile, which is easy to implant and recover, and the long pile can better improve the support stiffness and force performance.

[0047] In the market, due to the various problems of PC method piles 2 themselves, the present invention proposes a recyclable combined long and short pile steel continuous wall, creatively using long pile HC method piles 1 to improve and supplement the shortcomings of using PC method piles alone, and combined with Larsen steel sheet piles, a more economical, but better force and stiffer support system is formed, achieving the value of economy, safety and environmental protection. The recyclable combined long and short pile steel continuous wall support pile has high stiffness, good force performance, reliable quality, fast construction rate, small environmental impact, wider application range, good economic benefits, and no mud transportation problem. The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and illustration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations can be made according to the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A recyclable combined long and short pile steel continuous wall, characterized in that: include: HC construction pile, the HC construction pile is an I-shaped strip structure, including a first plate, a second plate and a third plate, the second plate is located at the center of the HC construction pile; the third plate is vertically arranged with the second plate and fixed inside the second plate; the first plate is vertically arranged with the second plate and fixed outside the second plate; PC construction piles, wherein the PC construction piles are cylindrical structures; Larsen steel sheet piles, the Larsen steel sheet piles are movably connected to the PC method piles; movably connected to the HC method piles; a plurality of the Larsen steel sheet piles are reversely connected and movably connected; Connectors, a plurality of which are arranged on the surfaces of the HC method piles and the PC method piles.

2. A recyclable combined long and short pile steel continuous wall as claimed in claim 1, characterized in that: It also includes a baseline, which is located at the outer edge of a preset foundation pit of the foundation pit project, and the shape of the baseline is matched with the preset foundation pit of the project.

3. A recyclable combined long and short pile steel continuous wall as claimed in claim 2, characterized in that: The connecting piece is located on the baseline, and the connecting piece is a locking structure.

4. A recyclable combined long and short pile steel continuous wall as claimed in claim 3, characterized in that: The long end of the third plate body of the HC method pile is connected to the connecting piece.

5. The recyclable combined long and short pile steel continuous wall as claimed in claim 3, characterized in that: The base line passes through the center of the PC method pile, and the connecting member is arranged at the intersection of the PC method pile and the base line.

6. The recyclable combined long and short pile steel continuous wall according to claim 1, characterized in that: The length of the HC construction method pile is greater than the length of the PC construction method pile.

7. The recyclable combined long and short pile steel continuous wall according to claim 1, characterized in that: A plurality of the connecting members are movably connected.

8. A recyclable combined long and short pile steel continuous wall as claimed in any one of claims 1 to 7, characterized in that: The connection method of the PC method pile, the HC method pile and the Larsen steel sheet pile can be, but is not limited to, close insertion, insertion one jump one and insertion one jump two; The ratio of the number of the short PC method piles to the number of the long HC method piles can be 1:1, 1:2, etc.

9. The recyclable combined long and short pile steel continuous wall as claimed in claim 3, characterized in that: The HC construction method piles, PC construction method piles, and Larsen steel sheet piles are constructed by resonance-free vibration hammers and static pressure. The tops of the Larsen steel sheet piles are anchored into reinforced concrete top beams for casting, and the tops of the HC construction method piles and PC construction method piles are cast through reinforced concrete top beams. When the surrounding environmental protection requirements are high or the foundation soil is relatively good, the short PC pile and the long HC pile are both provided with a plurality of grouting pipes, and non-soil forced mixing or high-pressure water injection grouting with the grouting pipe is used to pre-drill holes and add 5-10% cement content; When the project has higher requirements for water stopping or the silt sand layer is thick, prefabricated cement soil pile wall equipment is set according to the design requirements. The prefabricated cement soil pile wall equipment includes but is not limited to: single-axis and double-axis equipment for axial mixing, three-axis and multi-axis equipment, channel cutting TRD equipment and radial cutting double-wheel milling CSM equipment; the cement soil pile wall equipment is pre-pile or grooved and enters a relatively deep or hard rock and soil layer to form a cement soil pile wall, and the combined long and short pile steel continuous wall is implanted before the cement soil pile wall solidifies.

10. The recyclable combined long and short pile steel continuous wall according to claim 8, characterized in that: When the short pile PC method pile and the long pile HC method pile adopt the "insert one jump one" method, the diameter of the short pile PC method pile is 630mm, the wall thickness is 14mm, and the spacing is 1860mm. The model of the long pile HC method pile is H700*300*13*24, the spacing is 1860mm, the steel grade of the short pile PC method pile is Q335, the steel grade of the long pile HC method pile is Q235, the model of the Larsen steel plate is hot-rolled U400-170, the spacing is 400mm, and the steel grade of the Larsen steel plate is Q335.

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