Full-recoverable prestressed square pile and latticed column combined stand column pile

Abstract

The invention discloses a fully-recoverable prestressed square pile and latticed column combined stand column pile, and belongs to the technical field of foundation pit supporting. According to the fully-recyclable prestressed square pile and latticed column combined stand column pile, the prestressed square pile and the latticed column are organically combined to form the stand column pile, the prestressed square pile serves as the lower section of the stand column pile, static pressure construction is conducted, and the fully-recyclable prestressed square pile and latticed column combined stand column pile has the advantages of being low in cost, high in construction efficiency, free of pollution and the like; meanwhile, the square piles and the latticed columns in all the pile sections are connected conveniently and firmly, 100% recycling of the stand column piles can be achieved, and the low-carbon, environment-friendly and green construction effects are achieved; besides, when the stand column pile is pressed into a soil body, the upper and lower latticed columns are connected through the latticed column connecting joint, the stand column pile can be integrally pressed into the soil body conveniently, the latticed column connecting joint is replaced by the self-servo hydraulic converter after the foundation pit soil body is excavated, the foundation pit can be transversely supported layer by layer through the supporting cross beams in the four directions, and the foundation pit can be conveniently and rapidly supported. And the axial force of the supporting cross beam can be hydraulically and automatically compensated, so that the construction is simpler, more efficient and safer.

Description

Technical Field

[0001] The invention relates to a column pile for deep foundation pit support, and more specifically to a fully recyclable prestressed square pile plus lattice column combined column pile. Background Art

[0002] With the acceleration of urbanization and the continuous deepening of infrastructure construction, deep foundation pit projects play an increasingly important role in the development of high-rise buildings and underground spaces. The stability and safety of foundation pit support structures are directly related to the success of the project and the safety of the surrounding environment. The design and construction technology of foundation pit support structures have been continuously improved with the development of construction engineering technology. Among the many foundation pit support structures, column piles are a key vertical load-bearing component, and their design and construction technology have always been a research hotspot in the field of geotechnical engineering. Traditional foundation pit support structures mainly include cast-in-place piles, steel sheet piles, underground continuous walls, etc. While these structures provide the necessary vertical and lateral support, they also have certain limitations. For example, cast-in-place piles have a long construction period, high cost, and a great impact on the environment; although steel sheet piles have a fast construction speed, their bearing capacity is limited and they are difficult to drive in under certain geological conditions. Specifically, the existing column piles are generally composed of two parts. The lower section is generally cast-in-place piles or pipe piles, rigid composite piles, and the upper section is located in the foundation pit section. It is generally a steel lattice column or steel pipe, which has the following technical limitations:

[0003] a. Conventional cast-in-place piles have large mud pollution and high cost;

[0004] b. The pipe pile as the lower pile body has poor pull-out resistance. At the same time, since the pipe pile is connected to the upper steel lattice column through the inner core of the pipe pile, there are two major problems: first, the connection stiffness is poor, and second, concrete needs to be poured, and the concrete strength needs a long consolidation time;

[0005] c. The rigid composite pile is used as the lower pile body, and the pipe pile is inserted into the rigid composite pile, which also has the same problem as problem b;

[0006] d. For all the above types, the column piles cannot be recycled, and the effect of low-carbon, environmental protection and green construction cannot be achieved;

[0007] e. For all the above types, in actual construction, except for the test piles, no stress and displacement monitors and axial force detectors were installed, so that the actual deformation state of the foundation pit column piles could not be fully analyzed and monitored, and the safety of the foundation pit could not be effectively guaranteed;

[0008] f. All the above types are used as the connection points between the column pile and the concrete support or steel support. In the first case, the reinforced concrete and the concrete support are usually cast in situ to form a fixed hinge point, which will be removed later. In the second case, the steel pipe or steel column is usually connected to the steel support by bolts or welding, which cannot cope with the problem of excessive support deformation caused by foundation pit deformation.

[0009] Therefore, researching and developing new foundation pit support structures has important practical significance.

[0010] The application of precast square piles as column piles has gradually become a new trend in foundation pit support structures due to its advantages such as fast construction speed, easy quality control, and high cost-effectiveness. Precast pile technology has been widely used in the field of foundation pit support due to its advantages such as speed, economy, and environmental protection. Precast piles are piles pre-manufactured in factories with uniform quality standards and specifications, which can greatly reduce the time and cost of on-site construction. Types of precast piles include prestressed concrete pipe piles (PC piles), prestressed high-strength concrete pipe piles (PHC piles), and steel piles. These precast piles can be quickly driven into the soil by static pressure, hammering, or vibration during the construction process to form a stable foundation pit support structure. The application of precast square piles as column piles is mainly based on the following backgrounds:

[0011] 1) Improvement of construction efficiency: Traditional foundation pit support structures have a long construction period and require on-site concrete pouring or complex welding operations. The use of prefabricated square piles can significantly shorten the construction period and improve construction efficiency. After prefabricated square piles are prefabricated in the factory, they can be directly transported to the construction site for installation, reducing the time and labor requirements for on-site operations.

[0012] 2) Cost control: Prefabricated square piles can significantly reduce material waste and construction costs due to their factory-based production characteristics. Compared with traditional cast-in-place piles, prefabricated piles reduce the time for on-site pouring and maintenance, thereby reducing the overall cost of the project.

[0013] 3) Reduced environmental impact: The factory production of prefabricated square piles reduces noise and dust pollution during on-site construction, and has less impact on the surrounding environment. In addition, the standardized production of prefabricated piles also helps reduce the generation of construction waste.

[0014] 4) Improvement of structural safety and stability: Prefabricated square piles can provide more uniform and stable bearing capacity due to their uniform materials and precise geometric dimensions. In addition, the combination of prefabricated square piles and steel columns can further improve the stability and safety of the foundation pit support structure.

[0015] However, although prefabricated square piles have many advantages as column piles, they also face some technical challenges in practical applications, mainly including:

[0016] A. Connection technology

[0017] The connection technology between prefabricated square piles and other structures in the foundation pit (such as steel columns, support beams, etc.) is the key. How to ensure the stability and reliability of the connection is a technical problem in the application of prefabricated square piles. In the prior art, a variety of connection methods have been proposed, such as mechanical connection, welding connection and anchor connection, to meet different engineering needs.

[0018] B. Adaptability

[0019] Different geological conditions put forward different requirements for the design and construction of prefabricated square piles. Prefabricated square piles need to have good adaptability to adapt to different soil conditions and bearing requirements.

[0020] C. Economic Analysis

[0021] The economic analysis of prefabricated square piles is an important factor in determining their application scope. Material cost, construction cost and maintenance cost need to be comprehensively considered to evaluate the economic feasibility of prefabricated square piles in different projects. Summary of the invention

[0022] 1. Technical problem to be solved by the invention

[0023] The purpose of the present invention is to provide a fully recyclable prestressed square pile plus lattice column combined column pile to solve the above problems existing in the existing column piles. The technical solution of the present invention is used to organically combine the prestressed square pile with the lattice column to form a column pile. The prestressed square pile is used as the lower section of the column pile. It can be constructed by static pressure, which has the advantages of low cost, high construction efficiency and no pollution. At the same time, the connection between the prestressed square pile section, the lattice column section and the square pile and the lattice column in each pile section is convenient and firm, and the column pile can be 100% recycled through the detachable design. , truly achieving zero emissions and realizing the effects of low-carbon, environmentally friendly and green construction; in addition, when the column piles are pressed into the soil, the detachable lattice column connecting sections are used to connect the upper and lower adjacent lattice column sections, which facilitates the overall pressing of the column piles into the soil to reach the designed elevation, and after the excavation of the foundation pit soil, the self-servo hydraulic converter is used to replace the lattice column connecting sections, which can be used to support the foundation pit layer by layer through four-way supporting beams, and the axial force of the supporting beams can be automatically compensated hydraulically, making the deep foundation pit construction operation simpler and more efficient, and the construction safer and more stable.

[0024] In addition, since the column pile can be 100% recyclable, sensors such as stress monitors, displacement monitors and axial force detectors can be built into the prestressed square pile section. In conjunction with the background monitoring system, full-section monitoring of the foundation pit can be achieved; the background monitoring system can also control the output pressure of the self-servo hydraulic converter based on the foundation pit deformation obtained by the built-in sensors, thereby effectively suppressing the deformation of the foundation pit.

[0025] 2. Technical solution

[0026] In order to achieve the above object, the technical solution provided by the present invention is:

[0027] A fully recyclable prestressed square pile plus lattice column combined column pile of the present invention comprises a prestressed square pile segment and a lattice column segment, wherein the lattice column segment is connected to the upper end of the prestressed square pile segment, the prestressed square pile segment is located in the base stratum of a foundation pit, and the lattice column segment is located in the foundation pit; wherein:

[0028] The prestressed square pile segment comprises a plurality of sections of prestressed prefabricated square piles, and two adjacent sections of the prestressed prefabricated square piles are connected via a prefabricated square pile connector; the upper end of the prestressed prefabricated square pile located at the uppermost part is also selectively connected to a prestressed square pile modification section via a prefabricated square pile connector;

[0029] The lattice column pile section includes a plurality of lattice column sections and a plurality of self-servo hydraulic converters. The lattice column located at the bottom is connected to the prestressed prefabricated square pile or prestressed square pile modified section located at the top. The upper and lower adjacent lattice column sections are connected by a detachable lattice column connecting section when pressed into the soil. The lattice column connecting section can be removed after excavation of the foundation pit soil and replaced by a self-servo hydraulic converter. The self-servo hydraulic converter is also installed at the upper end of the lattice column located at the top. The self-servo hydraulic converter has a four-way servo automatic compensation hydraulic mechanism for connecting the supporting beam.

[0030] Furthermore, when the self-servo hydraulic converter replaces the corresponding lattice column connecting section, the upper and lower adjacent lattice columns are temporarily connected through a temporary converter, and the temporary converter is composed of four outward-expanding connecting parts. The four outward-expanding connecting parts can gradually replace the lattice column connecting sections to connect the upper and lower adjacent lattice columns when the lattice column connecting sections are removed, and an enlarged space for installing the self-servo hydraulic converter is formed between the four outward-expanding connecting parts; when installing the self-servo hydraulic converter, the four outward-expanding connecting parts are removed one by one in sequence.

[0031] Furthermore, the self-servo hydraulic converter includes a hydraulic converter main box, a detachable converter connecting plate, a hydraulic jack connecting plate, a hydraulic jack cylinder sleeve and a hydraulic jack cylinder. The hydraulic converter main box is a rectangular structure. The detachable converter connecting plate is respectively installed on the upper and lower end surfaces of the hydraulic converter main box for connecting with upper and lower adjacent lattice columns. The hydraulic jack connecting plates are respectively fixedly installed on the four sides of the hydraulic converter main box. Each of the hydraulic jack connecting plates is provided with a set of hydraulic jack cylinder sleeves and hydraulic jacks. Cylinder; a beam connecting plate is fixed to one end of the supporting beam, and the beam connecting plate has a positioning hole that matches the hydraulic jack cylinder; the hydraulic jack connecting plate and the beam connecting plate are both "I"-shaped structures. When the supporting beam is connected to the self-servo hydraulic converter, the telescopic end of the hydraulic jack cylinder is inserted into the positioning hole of the supporting beam, and a connecting screw for preventing falling is also provided between the hydraulic jack connecting plate and the beam connecting plate, and an axial movable margin is provided between the connecting screw and the corresponding hydraulic jack connecting plate and / or beam connecting plate.

[0032] Furthermore, the upper and lower ends of the prestressed prefabricated square pile are provided with end embedded connecting pieces at four corners, and the prefabricated square pile connector is composed of four angle steels for connecting with the end embedded connecting pieces; the lower end of the prestressed square pile modification section is provided with a modification section lower end embedded screw sleeve for connecting with the prefabricated square pile connector, and the upper end of the prestressed square pile modification section is provided with a modification section upper end connecting angle steel for connecting with the lower end of the lattice column; when the lattice column is connected through the prestressed square pile modification section, the lower end of the prestressed square pile modification section is connected to the adjacent prestressed prefabricated square pile through the prefabricated square pile connector, and the upper end of the prestressed square pile modification section is connected to the adjacent lattice column through the modification section upper end connecting angle steel; when the prestressed prefabricated square pile is directly connected to the lattice column, the adjacent prestressed prefabricated square piles are fixedly connected to the lattice column through the prefabricated square pile connector.

[0033] Furthermore, in the prestressed square pile section, at least one of the prestressed prefabricated square pile and the prestressed square pile modification section has a built-in sensor, the built-in sensor includes a stress monitor, a displacement monitor and an axial force detector, and the built-in sensor is communicatively connected to a background monitoring system via a wireless communication module; the background monitoring system is also communicatively connected to a self-servo hydraulic converter, and the background monitoring system controls the output pressure of the self-servo hydraulic converter according to the foundation pit deformation obtained by monitoring by the built-in sensor.

[0034] Furthermore, the lattice column is a steel lattice column welded from a lattice column angle steel and a lattice column tie plate, and the steel lattice column is pressed into the soil in the following manner:

[0035] The steel lattice column is connected to the prestressed prefabricated square pile through a prestressed square pile modification section, a steel pallet is installed on the top of the prestressed square pile modification section, a casing pile driver is sleeved on the outer side of the steel lattice column, the lower end of the casing pile driver abuts against the steel pallet, and the prestressed square pile section and the steel lattice column are pressed into the soil to the designed elevation through the static pressure of the casing pile driver.

[0036] Furthermore, a pulley stopper is further provided on the lattice column plate of the steel lattice column. The pulley stopper is circumferentially distributed along the inner side wall of the casing pile driver and can roll up and down relative to the inner side wall of the casing pile driver.

[0037] Furthermore, the lattice column is a concrete lattice column, which includes a steel lattice column body welded from lattice column angle steels and lattice column tie plates, and reinforced concrete poured and filled in the steel lattice column body. The concrete lattice column is pressed into the soil to a designed elevation together with prestressed square pile segments by a holding pressure method.

[0038] Furthermore, the lattice column is a reinforced steel plate lattice column, which includes a steel lattice column body welded from lattice column angle steels and lattice column tie plates, and a reinforcing steel sleeve mounted and fixed inside the steel lattice column body. Reinforced side plates located between adjacent lattice column angle steels are also fixed on the outer wall of the reinforcing steel sleeve. The reinforced steel plate lattice column is pressed into the soil to a designed elevation together with prestressed square pile segments by a holding pressure method.

[0039] Furthermore, the prestressed prefabricated square piles, the prestressed square pile modification sections and the lattice columns at the bottom are reserved with lifting and pulling holes that cooperate with the balanced vertical hydraulic jacks at intervals in the upper and lower directions. The balanced vertical hydraulic jack has two left and right parts with symmetrical structures. The left and right parts both include a semi-ring fixing seat, a fixing plate, a hydraulic cylinder, a lifting slide and a pushing and pushing rod. The fixing plate is arranged at the lower part of the semi-ring fixing seat, the hydraulic cylinder is fixed on the fixing plate, the lifting slide is slidably arranged on the semi-ring fixing seat up and down, and is connected to the driving end of the hydraulic cylinder, and the pushing and pushing rod is horizontally fixed on the lifting slide; the semi-ring fixing seats of the left and right parts can be docked into an annular seat that embraces the column pile, and the pushing and pushing rods of the left and right parts can be axially docked and inserted into the corresponding lifting and pulling holes, and the column pile is lifted and recovered by utilizing the pushing force generated by the hydraulic cylinder.

[0040] 3. Beneficial effects

[0041] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0042] (1) A fully recyclable prestressed square pile plus lattice column combined column pile of the present invention comprises a prestressed square pile segment and a lattice column segment, wherein the lattice column segment is connected to the upper end of the prestressed square pile segment, the prestressed square pile segment comprises a plurality of prestressed prefabricated square pile segments, two adjacent prestressed prefabricated square pile segments are connected via a prefabricated square pile connector, and the upper end of the prestressed prefabricated square pile located at the top is also selectively connected to a prestressed square pile modification segment via a prefabricated square pile connector; the lattice column segment comprises a plurality of lattice column segments and a plurality of self-servo hydraulic converters, the lattice column located at the bottom is connected to the prestressed prefabricated square pile or prestressed square pile modification segment located at the top, the two adjacent lattice column segments are connected via a detachable lattice column connection segment when pressed into the soil, the lattice column connection segment can be disassembled after the foundation pit soil is excavated and replaced by a self-servo hydraulic converter, the self-servo hydraulic converter is also installed at the upper end of the lattice column located at the top, and the self-servo hydraulic converter has a four-way use The servo automatic compensation hydraulic mechanism for connecting the supporting beams; the prestressed square piles and lattice columns are organically combined to form column piles. The prestressed square piles are used as the lower section of the column piles, and can be constructed by static pressure, which has the advantages of low cost, high construction efficiency and no pollution; at the same time, the connection between the prestressed square pile sections, lattice column sections, and the square piles and lattice columns in each section is convenient and firm. The detachable design can achieve 100% recycling of the column piles, truly achieving zero emissions and realizing the effect of low-carbon, environmental protection and green construction; in addition, when the column piles are pressed into the soil, the detachable lattice column connection section is used to realize the connection between the upper and lower adjacent lattice column sections, which facilitates the overall pressing of the column piles into the soil to reach the designed elevation, and after the excavation of the foundation pit soil, the self-servo hydraulic converter is used to replace the lattice column connection section, and the lateral support of the foundation pit can be performed layer by layer through the four-way support beams, and the axial force of the support beams can be hydraulically automatically compensated, making the deep foundation pit construction operation simpler and more efficient, and the construction safer and more stable;

[0043] (2) A fully recyclable prestressed square pile plus lattice column combined column pile of the present invention, when the self-servo hydraulic converter replaces the corresponding lattice column connection section, the upper and lower adjacent lattice columns are temporarily connected through a temporary converter, and the temporary converter is composed of four outward expansion connectors, which can gradually replace the lattice column connection section to connect the upper and lower adjacent lattice columns when the lattice column connection section is removed, and an enlarged space for installing the self-servo hydraulic converter is formed between the four outward expansion connectors; when installing the self-servo hydraulic converter, the four outward expansion connectors are disassembled one by one in turn; the use of the above-mentioned temporary converter can facilitate the installation of the self-servo hydraulic converter while ensuring construction safety, and has the advantages of simple structure and convenient operation;

[0044] (3) The present invention is a fully recyclable prestressed square pile plus lattice column combined column pile, whose self-servo hydraulic converter includes a hydraulic converter main box, a detachable converter connecting plate, a hydraulic jack connecting plate, a hydraulic jack cylinder sleeve and a hydraulic jack oil cylinder. The self-servo hydraulic converter has a compact structure and can be connected to the supporting crossbeam in a "cross" direction on the horizontal plane. It has good support stability for the foundation pit and is convenient for the construction of subsequent layers. In addition, the self-servo hydraulic converter is reliably connected to the supporting crossbeam. A connecting screw for preventing falling is provided between the hydraulic jack connecting plate and the crossbeam connecting plate. There is an axial movable margin between the connecting screw and the corresponding hydraulic jack connecting plate and / or the crossbeam connecting plate, so that the self-servo hydraulic converter can automatically compensate for the axial force of the supporting crossbeam and can effectively prevent the supporting crossbeam from accidentally falling, thereby ensuring construction safety.

[0045] (4) A fully recyclable prestressed square pile plus lattice column combined column pile of the present invention has end embedded connectors at the upper and lower ends and four corners of the prestressed prefabricated square pile, and the prefabricated square pile connector is composed of four angle steels for connecting with the end embedded connectors; the lower end of the prestressed square pile modification section has a modification section lower end embedded screw sleeve for connecting with the prefabricated square pile connector, and the upper end of the prestressed square pile modification section has a modification section upper end connecting angle steel for connecting with the lower end of the lattice column; the above-mentioned embedded connectors are used to ensure the connection accuracy and strength, and the angle steel structure is used for connection, the connection operation is simple, and the connection is firm and reliable;

[0046] (5) A fully recyclable prestressed square pile plus lattice column combined column pile of the present invention, wherein in the prestressed square pile section, at least one of the prestressed prefabricated square pile and the prestressed square pile modified section has a built-in sensor, the built-in sensor includes a stress monitor, a displacement monitor and an axial force detector, and the built-in sensor is connected to the background monitoring system through a wireless communication module. Since the column pile can be 100% fully recycled, the stress monitor, displacement monitor and axial force detector and other sensors can be built into the prestressed square pile section and can be reused, and the full-section monitoring of the foundation pit can be realized in conjunction with the background monitoring system; the background monitoring system is also connected to the self-servo hydraulic converter, and the background monitoring system controls the output pressure of the self-servo hydraulic converter according to the foundation pit deformation obtained by the built-in sensor, thereby effectively suppressing the foundation pit deformation;

[0047] (6) The present invention provides a fully recyclable prestressed square pile plus lattice column combined column pile, wherein the lattice column is a steel lattice column welded by lattice column angle steel and lattice column tie plate, the steel lattice column is connected to the prestressed prefabricated square pile through a prestressed square pile modification section, a steel tray is installed on the top of the prestressed square pile modification section, a casing pile driver is sleeved on the outer side of the steel lattice column, the lower end of the casing pile driver abuts against the steel tray, and the prestressed square pile segment and the steel lattice column are pressed into the soil to the designed elevation through the static pressure of the casing pile driver. The casing pile driver design can solve the problem that the steel lattice column is not resistant to radial pressure, and achieves the purpose of statically pressing the prestressed square pile segment and the steel lattice column into the soil together, and the construction method is novel and efficient;

[0048] (7) In the fully recyclable prestressed square pile plus lattice column combined column pile of the present invention, a pulley stopper is further provided on the lattice column plate of the steel lattice column, and the pulley stopper is circumferentially distributed along the inner side wall of the casing pile driver and can roll up and down relative to the inner side wall of the casing pile driver. The use of the pulley stopper can ensure the matching accuracy between the steel lattice column and the casing pile driver, and can effectively avoid the problem of inclination of the steel lattice column;

[0049] (8) The present invention provides a fully recyclable prestressed square pile plus lattice column combined column pile, wherein the lattice column is a concrete lattice column, the concrete lattice column comprises a steel lattice column body welded by lattice column angle steel and lattice column tie plate, and reinforced concrete poured and filled in the steel lattice column body, the concrete lattice column is pressed into the soil to the designed elevation together with the prestressed square pile segment by means of holding pressure; or the lattice column is a reinforced steel plate lattice column, the reinforced steel plate lattice column comprises a steel lattice column body welded by lattice column angle steel and lattice column tie plate The steel lattice column body is formed by the reinforced steel sleeve which is set and fixed in the steel lattice column body. The outer wall of the reinforced steel sleeve is also fixed with a reinforced side plate located between the adjacent lattice column angle steels. The reinforced steel plate lattice column is pressed into the soil to the designed elevation together with the prestressed square pile segment by means of holding pressure. The design of concrete lattice column and reinforced steel plate lattice column can make the lattice column have radial pressure bearing capacity, so as to achieve the effect of directly holding and pressing into the soil. For deep foundation pits, the construction is simpler and more convenient.

[0050] (9) The fully recyclable prestressed square pile plus lattice column combined column pile of the present invention has lifting holes for matching with balanced vertical hydraulic jacks reserved at intervals along the upper and lower directions of the prestressed prefabricated square pile, the prestressed square pile modification section and the lattice column located at the bottom. The column pile can be lifted and pulled by using the balanced vertical hydraulic jack in conjunction with a crane, making the lifting and pulling of the column pile more convenient and quick, and the lifting and pulling operation is safe and reliable; and the balanced vertical hydraulic jack is installed on the bottom plate, which can prevent damage to the bottom plate during the lifting and pulling process;

[0051] (10) The present invention provides a fully recyclable prestressed square pile plus lattice column combined column pile, whose balanced vertical hydraulic jack adopts a two-petal combination structure, and uses two sets of symmetrical hydraulic cylinders and pushing rods to push and pull the column pile, thereby ensuring the balance of the pulling force and realizing the vertical pulling of the column pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of a fully recyclable prestressed square pile plus lattice column combined column pile of the present invention;

[0053] Figure 2 It is a schematic diagram of the construction state of the combined column pile of the present invention being pressed into the soil in cooperation with the casing pile driver;

[0054] Figure 3 A schematic diagram of a state in which a temporary converter is installed for a combined column pile of the present invention;

[0055] Figure 4 A schematic diagram of a state in which a self-servo hydraulic converter is installed in a combined column pile of the present invention;

[0056] Figure 5 It is a schematic diagram of the state in which the combined column pile of the present invention is installed with the supporting beam through the self-servo hydraulic converter;

[0057] Figure 6 It is a perspective structural schematic diagram of the prestressed prefabricated square pile in the combined column pile of the present invention;

[0058] Figure 7 It is a perspective structural schematic diagram of a prestressed square pile modification section in a combined column pile of the present invention;

[0059] Figure 8 It is a structural schematic diagram of a steel lattice column in a combined column pile of the present invention;

[0060] Fig. 9 It is a schematic diagram of the steel lattice column in the combined column pile of the present invention cooperating with the casing pile driver through the pulley stopper;

[0061] Fig.10 It is a schematic diagram of the overall structure of the lattice column connection section in the combined column pile of the present invention;

[0062] Fig.11 It is a schematic diagram of the split structure of the lattice column connection section in the combined column pile of the present invention;

[0063] Fig.12 It is a schematic diagram of the structure of the steel tray in the combined column pile of the present invention;

[0064] Fig.13 It is a structural schematic diagram of installing upper and lower lattice columns through a temporary converter in the combined column pile of the present invention;

[0065] Fig.14 It is a structural schematic diagram of a self-servo hydraulic converter in a combined column pile of the present invention;

[0066] Fig.15 It is a structural schematic diagram of the supporting beam in the present invention;

[0067] Fig.16 It is a structural schematic diagram of a combined column pile using concrete lattice columns in the present invention;

[0068] Fig.17 It is a structural schematic diagram of the concrete lattice column in the present invention;

[0069] Fig.18 It is a structural schematic diagram of a combined column pile using a reinforced steel plate lattice column in the present invention;

[0070] Fig.19 It is a schematic diagram of the overall structure of the reinforced steel plate lattice column in the present invention;

[0071] Fig. 20 It is a schematic diagram of the split structure of the reinforced steel plate lattice column in the present invention;

[0072] Fig.21 It is a schematic diagram of the state of lifting and pulling out the combined column pile by using the balanced vertical hydraulic jack in the present invention;

[0073] Fig. 22 It is a schematic diagram of the combined state of the balanced vertical hydraulic jack in the present invention;

[0074] Fig.23 It is a schematic diagram of the disassembled state of the balanced vertical hydraulic jack in the present invention.

[0075] Explanation of the symbols in the schematic diagram:

[0076] 100. Prestressed square pile segment; 11. Prestressed prefabricated square pile; 11-1. Prefabricated square pile steel cage; 11-2. End embedded connector; 11-3. Square pile embedded end plate; 11-4. Embedded casing; 11-5. First built-in sensor; 11-6. Prefabricated square pile concrete; 12. Prefabricated square pile connector; 13. Prestressed square pile modified section; 13-1. Modified section angle steel; 13-2. Modified section reinforcement plate; 13-3. Modified section steel cage; 13-4. Modified section lower end embedded screw sleeve; 13-5. Modified section embedded end plate; 13-6. Second built-in sensor; 13-7. Modified section concrete; 13-8. Modified section upper end connecting angle steel;

[0077] 200, lattice column pile segment; 21, lattice column; 21A, steel lattice column; 21B, concrete lattice column; 21C, reinforced steel plate lattice column; 21-1, lattice column angle steel; 21-2, lattice column tie plate; 21-3, lattice column connection; 21-4, pulley stopper; 21-5, reinforced concrete; 21-6, reinforced steel sleeve; 21-7, reinforced side plate; 22, lattice column connection section; 22-1, connection section reinforced tie plate; 22-2, connection section angle steel; 22-3, connection section connection; 22-4, Bolt connection hole; 23, temporary converter; 23-1, external expansion connector; 24, self-servo hydraulic converter; 24-1, hydraulic converter main box; 24-2, detachable converter connection plate; 24-3, hydraulic jack connection plate; 24-3a, movable connection hole; 24-4, hydraulic jack cylinder sleeve; 24-5, hydraulic jack cylinder; 24-6, hydraulic pipeline; 24-7, sensor connection pipeline; 25, steel pallet; 25-1, pallet body; 25-2, installation hole; 25-3, support rib;

[0078] 300, casing pile driver; 31, latch;

[0079] 400, supporting beam; 41, prestressed concrete supporting column; 42, embedded end connector; 43, beam connecting plate; 44, positioning hole;

[0080] 500, balanced vertical hydraulic jack; 51, half-ring fixing seat; 51-1, slide groove; 51-2, locking hole; 52, fixing plate; 53, hydraulic cylinder; 54, lifting slide; 55, pushing rod. DETAILED DESCRIPTION

[0081] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0082] Reference Figure 1 , Figure 4 and Figure 5 As shown, a fully recyclable prestressed square pile plus lattice column combined column pile of the present invention comprises a prestressed square pile segment 100 and a lattice column segment 200. The lattice column segment 200 is connected to the upper end of the prestressed square pile segment 100. The prestressed square pile segment 100 is located in the bottom stratum of the foundation pit, and the lattice column segment 200 is located in the foundation pit. Wherein:

[0083] The prestressed square pile segment 100 includes a plurality of sections of prestressed prefabricated square piles 11, and two adjacent sections of prestressed prefabricated square piles 11 are connected by a prefabricated square pile connector 12. The number of prestressed prefabricated square piles 11 can be determined according to the design depth of the prestressed square pile segment 100, and can be statically pressed into the soil section by section. As needed, a prestressed square pile modification section 13 is selectively connected to the upper end of the prestressed prefabricated square pile 11 located at the uppermost part through the prefabricated square pile connector 12, and the prestressed square pile modification section 13 is mainly used to achieve connection with the lattice column segment 200. When the prestressed prefabricated square pile 11 can be directly connected to the lattice column segment 200, the prestressed square pile modification section 13 may not be used.

[0084] The lattice column pile section 200 includes a plurality of lattice column sections 21 and a plurality of self-servo hydraulic converters 24. The lattice column 21 located at the bottom is connected to the prestressed prefabricated square pile 11 or the prestressed square pile modification section 13 located at the top. The upper and lower adjacent lattice column sections 21 are connected by a detachable lattice column connecting section 22 when pressed into the soil. The number of lattice columns 21 can be determined according to the designed depth of the foundation pit. The lattice column connecting section 22 can be conveniently pressed into the soil after connecting the upper and lower lattice columns 21. The lattice column connecting section 22 can be removed after excavating the foundation pit soil and replaced by the self-servo hydraulic converter 24. The self-servo hydraulic converter 24 is also installed at the upper end of the lattice column 21 located at the top. The self-servo hydraulic converter 24 has a four-way servo automatic compensation hydraulic mechanism for connecting the supporting beam 400.

[0085] During construction, the prestressed prefabricated square piles 11 can be pressed into the soil using a static press. When the prestressed square pile modification section 13 is needed, the prestressed square pile modification section 13 is used as the top section of the prestressed square pile segment 100 and pressed into the soil together. Compared with conventional cast-in-place piles, it has the advantages of low cost, high construction efficiency and no pollution. Then, the lattice column 21 is connected to the top of the prestressed square pile segment 100, and the adjacent lattice columns 21 are connected by the lattice column connecting section 22, and are further pressed into the soil together with the prestressed square pile segment 100 until the designed elevation is reached. Then, the surface soil of the foundation pit is excavated. Pour the first layer of concrete support around the foundation pit, and install a self-servo hydraulic converter 24 on the top of the uppermost lattice column 21, and use the self-servo hydraulic converter 24 to install support beams 400 in four directions to provide lateral support for the concrete support of the side wall of the foundation pit; continue to excavate the foundation pit soil until the lattice column connection section 22 of the next layer is exposed, and after temporarily supporting the exposed lattice column 21 on the upper part, use the self-servo hydraulic converter 24 to replace the lattice column connection section 22, and repeat the above construction process to support the second layer of concrete support and surrounding purlin structure; continue to excavate the foundation pit soil and repeat the above steps until the foundation pit base is reached. The fully recyclable prestressed square pile plus lattice column combined column pile of the present invention optimizes the construction process of foundation pit support, and can provide lateral support for the foundation pit layer by layer through four-way support beams, and the axial force of the support beams can be hydraulically compensated automatically, making the deep foundation pit construction operation simpler and more efficient, and the construction is safer and more stable. In addition, the detachable design allows for 100% recycling of column piles, truly achieving zero emissions and realizing the effects of low-carbon, environmentally friendly, and green construction.

[0086] The present invention will be further described below in conjunction with the embodiments.

[0087] [Example 1]

[0088] like Figures 1 to 5As shown, a fully recyclable prestressed square pile plus lattice column combined column pile of this embodiment includes a prestressed square pile segment 100 and a lattice column segment 200. The lattice column segment 200 is connected to the upper end of the prestressed square pile segment 100. The prestressed square pile segment 100 includes a plurality of sections of prestressed prefabricated square piles 11. The upper and lower adjacent sections of the prestressed prefabricated square piles 11 are connected by a prefabricated square pile connector 12. The upper end of the prestressed prefabricated square pile 11 located at the uppermost part is also selectively connected with a prestressed square pile modification section 13 through the prefabricated square pile connector 12. The lattice column segment 200 includes a plurality of sections of lattice piles. The lattice column 21 and a plurality of self-servo hydraulic converters 24, the lattice column 21 at the bottom is connected to the prestressed prefabricated square pile 11 or the prestressed square pile modification section 13 at the top, and the upper and lower adjacent lattice column sections 21 are connected by a detachable lattice column connecting section 22 when pressed into the soil, and the lattice column connecting section 22 can be removed after excavating the foundation pit soil and replaced by the self-servo hydraulic converter 24, and the self-servo hydraulic converter 24 is also installed on the upper end of the lattice column 21 at the top, and the self-servo hydraulic converter 24 has a four-way servo automatic compensation hydraulic mechanism for connecting the supporting beam 400.

[0089] In this embodiment, when the self-servo hydraulic converter 24 replaces the corresponding lattice column connecting section 22, the upper and lower adjacent lattice columns 21 are temporarily connected through the temporary converter 23. Fig.13 As shown, the temporary converter 23 is composed of four outward expansion connectors 23-1, and the upper and lower ends of the outward expansion connector 23-1 respectively have opposite U-shaped connection parts, so that the size of the outward expansion connector 23-1 is expanded outward after being installed on the lattice column 21; in this way, the four outward expansion connectors 23-1 can gradually replace the lattice column connection section 22 to connect the upper and lower adjacent lattice columns 21 when the lattice column connection section 22 is removed, and an expanded space for installing the self-servo hydraulic converter 24 is formed between the four outward expansion connectors 23-1, so as to facilitate the subsequent installation of the self-servo hydraulic converter 24. Since the upper and lower adjacent lattice columns 21 are fixed, in order to facilitate the removal of the lattice column connection section 22, refer to Fig.10 and Fig.11As shown, the lattice column connection section 22 in this embodiment adopts a two-half split structure design. Specifically, the lattice column connection section 22 is mainly composed of four connection section reinforcement plates 22-1 and four connection section angle steels 22-2. The upper and lower ends of the connection section angle steel 22-2 are respectively provided with connection section connection parts 22-3 for connecting with the lattice column 21, wherein two connection section reinforcement plates 22-1 are vertically welded and fixed on one connection section angle steel 22-2, and another connection section angle steel 22-2 is welded to one side of one of the connection section reinforcement plates 22-1 to form an independent welded part. The left and right halves of the welded parts have the same structure and are fixedly connected by bolts after being butted together. Bolt connection holes 22-4 are respectively provided at the butt joints of the left and right halves of the welded parts. When disassembling the lattice column connection section 22, first remove the welded part on one side and temporarily support it with the above-mentioned outward expansion connector 23-1, and then remove the welded part on the other side and temporarily support it with the above-mentioned outward expansion connector 23-1 to form a welded part. Fig.13 The state shown. When installing the self-servo hydraulic converter 24, the four outward expansion connectors 23-1 are disassembled one by one in sequence. Specifically, one of the outward expansion connectors 23-1 can be disassembled first, and then the self-servo hydraulic converter 24 can be placed between the upper and lower lattice columns 21, and the upper and lower ends of the self-servo hydraulic converter 24 are respectively connected to the upper and lower lattice columns 21 after the outward expansion connector 23-1 is removed, and then the outward expansion connectors 23-1 are removed one by one and the self-servo hydraulic converter 24 is connected. The above-mentioned temporary converter 23 can facilitate the installation of the self-servo hydraulic converter 24 while ensuring construction safety, and has the advantages of simple structure and convenient operation.

[0090] like Fig.14As shown, in this embodiment, the self-servo hydraulic converter 24 comprises a hydraulic converter main box 24-1, a detachable converter connecting plate 24-2, a hydraulic jack connecting plate 24-3, a hydraulic jack cylinder sleeve 24-4 and a hydraulic jack oil cylinder 24-5. The hydraulic converter main box 24-1 is a rectangular structure. The detachable converter connecting plate 24-2 is respectively installed on the upper and lower end surfaces of the hydraulic converter main box 24-1, and is used to connect with the upper and lower adjacent lattice columns 21. Specifically, during installation, each can be first connected to the lattice column 21. The detachable converter connecting plate 24-2 is removed, and the main hydraulic converter housing 24-1 is placed between the upper and lower lattice columns 21. Then, the main hydraulic converter housing 24-1 is connected to the connection parts of the upper and lower lattice columns 21 by using part of the detachable converter connecting plate 24-2. After that, each time an external expansion connection 23-1 is removed, the main hydraulic converter housing 24-1 and the lattice column 21 are connected by the detachable converter connecting plate 24-2, so as to gradually replace the lattice column connection section 22 of the self-servo hydraulic converter 24. The above-mentioned hydraulic jack connecting plates 24-3 are respectively fixedly mounted on the four sides of the main hydraulic converter housing 24-1. Each hydraulic jack connecting plate 24-3 is provided with a set of hydraulic jack cylinder sleeves 24-4 and hydraulic jack cylinders 24-5. The telescopic directions of the four sets of hydraulic jack cylinders 24-5 are arranged in a "cross" shape, and the axial force compensation of each hydraulic jack cylinder 24-5 can be independently controlled. Fig.15As shown, in this embodiment, a beam connecting plate 43 is fixed to one end of the supporting beam 400, and a positioning hole 44 is provided on the beam connecting plate 43 for matching with the hydraulic jack cylinder 24-5. Both the hydraulic jack connecting plate 24-3 and the beam connecting plate 43 are "I"-shaped structures. When the supporting beam 400 is connected to the self-servo hydraulic converter 24, the telescopic end of the hydraulic jack cylinder 24-5 is inserted into the positioning hole 44 of the supporting beam 400. A connecting screw for preventing falling is also provided between the hydraulic jack connecting plate 24-3 and the beam connecting plate 43, and an axial movable margin is provided between the connecting screw and the corresponding hydraulic jack connecting plate 24-3 and / or the beam connecting plate 43. That is to say, the connecting screw is not fixedly connected to the hydraulic jack connecting plate 24-3 and the beam connecting plate 43 in its axial direction. A movable connecting hole 24-3a is provided on the hydraulic jack connecting plate 24-3, and a corresponding through hole is also provided on the beam connecting plate 43. The connecting screw is sequentially inserted into the through hole of the beam connecting plate 43 and the movable connecting hole 24-3a of the hydraulic jack connecting plate 24-3. When the hydraulic jack cylinder 24-5 is extended and retracted to automatically compensate for the axial force, the hydraulic jack connecting plate 24-3 and the beam connecting plate 43 can move axially relative to each other. The self-servo hydraulic converter 24 can automatically compensate for the axial force of the supporting beam 400, and can effectively prevent the supporting beam 400 from accidentally falling, thereby ensuring construction safety. The supporting beam 400 can adopt existing steel pipe beams or concrete beams, etc. Specifically in this embodiment, the supporting beam 400 adopts a prestressed concrete support column 41, and the end of the prestressed concrete support column 41 also has a pre-embedded end connector 42, which is convenient for fixed connection with the beam connecting plate 43.

[0091] This embodiment also has structural improvements on the prestressed prefabricated square pile 11 and the prestressed square pile modification section 13. Figure 6 As shown, the prestressed prefabricated square pile 11 has end embedded connectors 11-2 at the four corners of the upper and lower ends. The end embedded connectors 11-2 include angle steels at the four corners and square pile embedded end plates 11-3, and threaded sleeves are provided on the angle steels at the four corners. A prefabricated square pile reinforcement cage 11-1 is provided inside the prestressed prefabricated square pile 11. The upper and lower ends of the main reinforcement of the prefabricated square pile reinforcement cage 11-1 are respectively fixed to the upper and lower square pile embedded end plates 11-3, and the whole is poured with concrete to form a prefabricated square pile concrete 11-6. The prestressed prefabricated square pile 11 has high structural strength and can be directly statically pressed into the soil. The above-mentioned prefabricated square pile connector 12 is composed of four angle steels used to connect to the end embedded connectors 11-2. The angle steels are used to connect adjacent prestressed prefabricated square piles 11, and the connection is firm and easy to recycle and disassemble. Refer to Figure 7As shown, the lower end of the prestressed square pile modified section 13 has a modified section lower end embedded screw sleeve 13-4 for connecting to the prefabricated square pile connector 12, and the upper end of the prestressed square pile modified section 13 has a modified section upper end connecting angle steel 13-8 for connecting to the lower end of the lattice column 21. The modified section upper end connecting angle steel 13-8 is formed by extending upward from the modified section angle steels 13-1 at the four corners of the prestressed square pile modified section 13, and adjacent modified section angle steels 13-1 are fixedly connected by a modified section reinforcement plate 13-2. The upper and lower ends of the prestressed square pile modified section 13 are also provided with a modified section embedded end plate 13-5, and a modified section steel cage 13-3 is provided inside the prestressed square pile modified section 13. The modified section steel cage 13-3 is fixedly connected to the upper and lower modified section embedded end plates 13-5, and the entire modified section concrete 13-7 is cast with concrete. When the lattice column 21 is connected through the prestressed square pile modification section 13, the lower end of the prestressed square pile modification section 13 is connected to the adjacent prestressed prefabricated square pile 11 through the prefabricated square pile connector 12, and the upper end of the prestressed square pile modification section 13 is connected to the adjacent lattice column 21 through the modification section upper end connecting angle steel 13-8; when the prestressed prefabricated square pile 11 is directly connected to the lattice column 21, the adjacent prestressed prefabricated square pile 11 and the lattice column 21 are fixedly connected through the prefabricated square pile connector 12. The above-mentioned prestressed prefabricated square pile 11 and prestressed square pile modification section 13 are used to ensure the connection accuracy and strength, and the angle steel structure is used for connection, the connection operation is simple, and the connection is firm and reliable.

[0092] Since the column pile can be 100% fully recycled, sensors such as stress monitors, displacement monitors and axial force detectors can be built into the prestressed square pile section 100 to monitor the deformation of the foundation pit. Specifically, in the prestressed square pile section 100, at least one of the prestressed prefabricated square pile 11 and the prestressed square pile modification section 13 has a built-in sensor. The built-in sensor includes a stress monitor, a displacement monitor and an axial force detector. The built-in sensor is connected to the background monitoring system through a wireless communication module. The built-in sensor can be reused after the column pile is recycled, and the full-section monitoring of the foundation pit can be achieved in conjunction with the background monitoring system. The background monitoring system is also connected to the self-servo hydraulic converter 24. The background monitoring system can have a built-in artificial intelligence AI algorithm. The background monitoring system controls the output pressure of the self-servo hydraulic converter 24 according to the foundation pit deformation obtained by the built-in sensor monitoring, effectively suppressing the foundation pit deformation and controlling the foundation pit deformation to the best. Figure 6 and Figure 7As shown, a first built-in sensor 11-5 can be embedded in the prestressed prefabricated square pile 11, and a second built-in sensor 13-6 can be embedded in the prestressed square pile modification section 13. The first built-in sensor 11-5 and the second built-in sensor 13-6 can transmit data with the background monitoring system through a 5G signal meter. In order to facilitate the power supply and communication of the first built-in sensor 11-5 and the second built-in sensor 13-6, in the above-mentioned self-servo hydraulic converter 24, in addition to the hydraulic pipeline 24-6 for controlling the hydraulic jack cylinder 24-5, there is also a sensor connection pipeline 24-7 to facilitate the line connection of the built-in sensor.

[0093] Reference Figure 2 and Figure 8 As shown, in this embodiment, the lattice column 21 is a steel lattice column 21A welded by a lattice column angle steel 21-1 and a lattice column tie plate 21-2, that is, a common lattice column, and lattice column connecting parts 21-3 are respectively provided at the upper and lower ends of the lattice column angle steel 21-1. The steel lattice column 21A is pressed into the soil by the following method:

[0094] The steel lattice column 21A is connected to the prestressed prefabricated square pile 11 through the prestressed square pile modification section 13. A steel tray 25 is installed on the top of the prestressed square pile modification section 13. A casing pile driver 300 is sleeved on the outer side of the steel lattice column 21A. The lower end of the casing pile driver 300 abuts against the steel tray 25. The static pressure of the casing pile driver 300 presses the prestressed square pile section 100 and the steel lattice column 21A into the soil to the designed elevation.

[0095] The casing pile driver 300 design can solve the problem that the steel lattice column 21A cannot withstand radial pressure, and achieves the purpose of statically pressing the prestressed square pile segment 100 and the steel lattice column 21A into the soil together. The construction method is novel and efficient.

[0096] like Fig.12 As shown, the above-mentioned steel pallet 25 includes a pallet body 25-1 and support ribs 25-3 welded to the lower part of the pallet body 25-1. The pallet body 25-1 is a disc structure. The pallet body 25-1 is provided with mounting holes 25-2 corresponding to the position and size of the above-mentioned modified section upper end connecting angle steel 13-8. After the prestressed square pile modified section 13 and the prestressed prefabricated square pile 11 are pressed into the soil, the steel pallet 25 is sleeved on the modified section upper end connecting angle steel 13-8 of the prestressed square pile modified section 13. At this time, the support ribs 25-3 can fit with the corresponding outer wall of the modified section upper end connecting angle steel 13-8, thereby improving the installation stability of the steel pallet 25 and playing a certain role in cutting the soil when pressed into the soil. The pallet body 25-1 enlarges the outer edge size of the prestressed square pile modified section 13, and the size of the casing pile driver 300 is adapted to the pallet body 25-1, as shown in FIG. Figure 2As shown, during construction, the casing pile driver 300 can be sleeved on the outside of the lattice column 21, and the lower end of the casing pile driver 300 is against the steel tray 25 to transmit pressure. The casing pile driver 300 can adopt a high-strength double-casing structure and use a static press to press down.

[0097] Reference Fig. 9 As shown, in order to prevent the lattice column 21 from tilting in the casing pile driver 300 during the pressing process, a pulley stopper 21-4 is further provided on the lattice column plate 21-2 of the steel lattice column 21A, and the pulley stopper 21-4 is distributed along the inner side wall of the casing pile driver 300 and can roll up and down relative to the inner side wall of the casing pile driver 300. The use of the pulley stopper 21-4 can ensure the matching accuracy between the steel lattice column 21A and the casing pile driver 300, and can effectively avoid the problem of the steel lattice column tilting. Furthermore, a pin hole may be provided on the casing pile driver 300. After the casing pile driver 300 is sleeved on the outside of the lattice column 21, the pin hole may be used to install a latch 31 on the casing pile driver 300. The latch 31 passes through the square gaps on the lattice column 21, which can prevent the casing pile driver 300 and the steel lattice column 21A from rotating relative to each other at a large angle, thereby further ensuring the pile driving stability of the casing pile driver 300.

[0098] The present embodiment is a fully recyclable prestressed square pile plus lattice column combined column pile, and a demolition gap is left between the bottom plate and each floor slab in the foundation pit and the column pile. After the construction of the bottom plate and each floor slab in the foundation pit is completed, the column pile can be pulled out, disassembled and recycled. In this embodiment, the prestressed prefabricated square pile 11, the prestressed square pile modification section 13 and the lattice column 21 at the bottom are reserved with pulling holes that match the balanced vertical hydraulic jack 500 at intervals along the vertical direction to facilitate the removal of the column pile. Figure 6 Taking the prestressed prefabricated square pile 11 as an example, there is a transversely arranged embedded sleeve 11-4 in the prestressed prefabricated square pile 11, and the above-mentioned extraction hole can be formed on the prestressed prefabricated square pile 11 by using the embedded sleeve 11-4. The extraction hole on the prestressed square pile modification section 13 can also be made in the same way; the extraction hole on the lattice column 21 can be set on its lattice column plate 21-2, or the gap between adjacent lattice column plates 21-2 can be used as the extraction hole. Fig.21 As shown, during pulling out, the balanced vertical hydraulic jack 500 is placed on the bottom plate of the foundation pit and connected to the pulling out hole. The balanced vertical hydraulic jack 500 is used to provide an upward pulling out force to gradually pull out the column piles, making the pulling out and recovery of the column piles more convenient and quick, and the pulling out operation is safe and reliable; and the balanced vertical hydraulic jack 500 is installed on the bottom plate to prevent damage to the bottom plate during the pulling out process.

[0099] Specific reference Fig. 22 and Fig.23As shown, the above-mentioned balanced vertical hydraulic jack 500 has two left and right parts with symmetrical structures, both of which include a semi-ring fixed seat 51, a fixed plate 52, a hydraulic cylinder 53, a lifting slide 54 and a pushing rod 55. The fixed plate 52 is arranged at the lower part of the semi-ring fixed seat 51, the hydraulic cylinder 53 is fixed on the fixed plate 52, the lifting slide 54 is slidably arranged on the semi-ring fixed seat 51 up and down, and is connected to the driving end of the hydraulic cylinder 53, and the pushing rod 55 is horizontally fixed on the lifting slide 54; in order to ensure the lifting stability of the lifting slide 54, a slide groove 51-1 is provided on the side wall of the semi-ring fixed seat 51, and the lifting slide 54 is slidably installed in the slide groove 51-1. The left and right half ring fixing seats 51 can be docked to form an annular seat that is embracing the column pile, and the left and right push rods 55 can be axially docked and inserted into the corresponding lifting holes, and the lifting and recovery of the column pile can be performed by using the pushing force generated by the hydraulic cylinder 53. There are also locking holes 51-2 at the two side ends of the half ring fixing seat 51. After the left and right half ring fixing seats 51 are docked, the two half ring fixing seats 51 can be fixed by bolts and other locking parts. In addition, a larger base can be provided at the bottom of the half ring fixing seat 51 to increase the contact area with the bottom plate. The balanced vertical hydraulic jack 500 adopts a two-petal combination structure, and uses two sets of symmetrical hydraulic cylinders and push rods to push and pull the column pile, which ensures the balance of the pulling force and realizes the vertical pulling of the column pile.

[0100] [Example 2]

[0101] The fully recyclable prestressed square pile plus lattice column combined column pile of this embodiment has the same basic structure and working principle as the first embodiment, except that:

[0102] like Fig.16 and Fig.17 As shown, in this embodiment, the lattice column 21 is a concrete lattice column 21B, which includes a steel lattice column body welded by a lattice column angle steel 21-1 and a lattice column tie plate 21-2, and reinforced concrete 21-5 poured and filled in the steel lattice column body. The concrete lattice column 21B is pressed into the soil to the designed elevation together with the prestressed square pile segment 100 by means of holding and pressing. The concrete lattice column design can make the lattice column have radial pressure bearing capacity, and thus can achieve the effect of directly holding and pressing into the soil, which is simpler and more convenient for deep foundation pits.

[0103] like Fig.17As shown, the main body of the steel lattice column has the same structure as the steel lattice column 21A of the above-mentioned embodiment 1, except that it has reinforced concrete 21-5, and steel fibers can be added to the reinforced concrete 21-5 to further improve the compressive strength of the concrete lattice column 21B. Due to the supporting effect of the reinforced concrete 21-5, the entire concrete lattice column 21B can be directly pressed into the soil by a static press, without the need to use a casing pile driver, and the construction is simpler and more convenient.

[0104] [Example 3]

[0105] The fully recyclable prestressed square pile plus lattice column combined column pile of this embodiment has the same basic structure and working principle as the first embodiment, except that:

[0106] like Figures 18 to 20 As shown, in this embodiment, the lattice column 21 is a reinforced steel plate lattice column 21C, which includes a steel lattice column body welded by a lattice column angle steel 21-1 and a lattice column tie plate 21-2, and a reinforced steel sleeve 21-6 sleeved and fixed in the steel lattice column body. A reinforced side plate 21-7 located between adjacent lattice column angle steels 21-1 is also fixed on the outer wall of the reinforced steel sleeve 21-6. The reinforced steel plate lattice column 21C is pressed into the soil to the designed elevation together with the prestressed square pile segment 100 by means of holding and pressing. The use of the reinforced steel plate lattice column design can make the lattice column have radial pressure bearing capacity, and thus can achieve the effect of directly holding and pressing into the soil, which is simpler and more convenient for deep foundation pits.

[0107] Reference Fig. 20 As shown, the main body of the steel lattice column has the same structure as the steel lattice column 21A of the above-mentioned embodiment 1, and the reinforcing steel sleeve 21-6 is a square steel pipe, and a reinforcing side plate 21-7 is welded on its outer wall. After the reinforcing steel sleeve 21-6 is installed in the main body of the steel lattice column, it can play a supporting role to it and improve its compressive resistance. Due to the supporting role of the reinforcing steel sleeve 21-6 and the reinforcing side plate 21-7, the entire reinforced steel plate lattice column 21C can be directly pressed into the soil using a static press, without the need to use a casing pile driver, and the construction is simpler and more convenient.

[0108] It is worth noting that the fully recyclable prestressed square pile plus lattice column combined column pile of the present invention may not be recycled according to specific construction requirements, and welding may be used to connect adjacent prestressed prefabricated square piles 11 and prestressed prefabricated square piles 11 and prestressed square pile modification sections 13. The prestressed square pile segments 100 left in the base stratum of the foundation pit can improve the stability of the building foundation.

[0109] The invention discloses a fully recyclable prestressed square pile plus lattice column combined column pile, which organically combines the prestressed square pile with the lattice column to form the column pile. The prestressed square pile is used as the lower section of the column pile, which can be constructed by static pressure, and has the advantages of low cost, high construction efficiency and no pollution. At the same time, the connection between the prestressed square pile section, the lattice column section and the square piles and lattice columns in each section is convenient and firm, and the column pile can be 100% recycled through the detachable design, which truly achieves zero emission and realizes the effect of low-carbon, environmental protection and green construction. When the column pile is pressed into the soil, the detachable lattice column connecting section is used to realize the connection between the upper and lower adjacent lattice column sections, which facilitates the column pile to be pressed into the soil as a whole to reach the designed elevation, and after the foundation pit soil is excavated, the lattice column connecting section is replaced by a self-servo hydraulic converter, and the foundation pit can be laterally supported by four-way supporting beams layer by layer, and the axial force of the supporting beams can be hydraulically automatically compensated, so that the deep foundation pit construction operation is simpler and more efficient, and the construction is safer and more stable.

[0110] Since the column pile can be 100% recycled, sensors such as stress monitors, displacement monitors and axial force detectors can be built into the prestressed square pile section. Together with the background monitoring system, full-section monitoring of the foundation pit can be achieved. The background monitoring system can also control the output pressure of the self-servo hydraulic converter based on the foundation pit deformation obtained by the built-in sensors, thereby effectively suppressing the deformation of the foundation pit.

[0111] The present invention and its embodiments are described schematically above, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and creatively designs a structure and an embodiment similar to the technical solution without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A fully recyclable prestressed square pile plus lattice column combined column pile, characterized in that: It comprises a prestressed square pile segment (100) and a lattice column segment (200), wherein the lattice column segment (200) is connected to the upper end of the prestressed square pile segment (100), the prestressed square pile segment (100) is located in the base stratum of a foundation pit, and the lattice column segment (200) is located in the foundation pit; wherein: The prestressed square pile segment (100) comprises a plurality of sections of prestressed prefabricated square piles (11), wherein two adjacent sections of the prestressed prefabricated square piles (11) are connected via a prefabricated square pile connector (12); the upper end of the prestressed prefabricated square pile (11) located at the uppermost part is also selectively connected to a prestressed square pile modification section (13) via a prefabricated square pile connector (12); The lattice column pile section (200) comprises a plurality of lattice column sections (21) and a plurality of self-servo hydraulic converters (24). The lattice column (21) located at the bottom is connected to the prestressed prefabricated square pile (11) or the prestressed square pile modification section (13) located at the top. When pressed into the soil, the two adjacent lattice column sections (21) are connected via a detachable lattice column connecting section (22). The lattice column connecting section (22) can be removed after the foundation pit soil is excavated and replaced by a self-servo hydraulic converter (24). The self-servo hydraulic converter (24) is also installed at the upper end of the lattice column (21) located at the top. The self-servo hydraulic converter (24) has a four-way servo automatic compensation hydraulic mechanism for connecting a supporting crossbeam (400).

2. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: When the self-servo hydraulic converter (24) replaces the corresponding lattice column connection section (22), the upper and lower adjacent lattice columns (21) are temporarily connected through a temporary converter (23), and the temporary converter (23) is composed of four outward expansion connecting pieces (23-1). When the lattice column connection section (22) is removed, the four outward expansion connecting pieces (23-1) can gradually replace the lattice column connection section (22) to connect the upper and lower adjacent lattice columns (21), and an enlarged space for installing the self-servo hydraulic converter (24) is formed between the four outward expansion connecting pieces (23-1); when the self-servo hydraulic converter (24) is installed, the four outward expansion connecting pieces (23-1) are removed one by one in sequence.

3. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: The self-servo hydraulic converter (24) comprises a hydraulic converter main box (24-1), a detachable converter connecting plate (24-2), a hydraulic jack connecting plate (24-3), a hydraulic jack cylinder sleeve (24-4) and a hydraulic jack oil cylinder (24-5). The hydraulic converter main box (24-1) is a rectangular structure. The detachable converter connecting plate (24-2) is respectively mounted on the upper and lower end surfaces of the hydraulic converter main box (24-1) and is used to connect with upper and lower adjacent lattice columns (21). The hydraulic jack connecting plates (24-3) are respectively fixedly mounted on four side surfaces of the hydraulic converter main box (24-1). Each of the hydraulic jack connecting plates (24-3) is provided with a group of hydraulic jack cylinder sleeves (24-4) and hydraulic jack oil cylinders (24-5). 4-5); a beam connecting plate (43) is fixed to one end of the support beam (400), and a positioning hole (44) is provided on the beam connecting plate (43) for matching with the hydraulic jack cylinder (24-5); the hydraulic jack connecting plate (24-3) and the beam connecting plate (43) are both "I"-shaped structures, and when the support beam (400) is connected to the self-servo hydraulic converter (24), the telescopic end of the hydraulic jack cylinder (24-5) is inserted into the positioning hole (44) of the support beam (400), and a connecting screw for preventing falling is also provided between the hydraulic jack connecting plate (24-3) and the beam connecting plate (43), and an axial movable margin is provided between the connecting screw and the corresponding hydraulic jack connecting plate (24-3) and / or the beam connecting plate (43).

4. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: The four corners of the upper and lower ends of the prestressed prefabricated square pile (11) are provided with end embedded connectors (11-2); the prefabricated square pile connector (12) is composed of four angle steels for connecting with the end embedded connectors (11-2); the lower end of the prestressed square pile modification section (13) is provided with a modification section lower end embedded screw sleeve (13-4) for connecting with the prefabricated square pile connector (12); the upper end of the prestressed square pile modification section (13) is provided with a modification section upper end connecting angle steel (13-8) for connecting with the lower end of the lattice column (21); When the prestressed square pile modification section (13) is connected to the lattice column (21), the lower end of the prestressed square pile modification section (13) is connected to the adjacent prestressed prefabricated square pile (11) through the prefabricated square pile connector (12), and the upper end of the prestressed square pile modification section (13) is connected to the adjacent lattice column (21) through the modification section upper end connecting angle steel (13-8); when the prestressed prefabricated square pile (11) is directly connected to the lattice column (21), the adjacent prestressed prefabricated square piles (11) and the lattice column (21) are fixedly connected through the prefabricated square pile connector (12).

5. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: In the prestressed square pile segment (100), at least one of the prestressed prefabricated square pile (11) and the prestressed square pile modification section (13) has a built-in sensor, the built-in sensor includes a stress monitor, a displacement monitor and an axial force detector, the built-in sensor is connected to a background monitoring system through a wireless communication module; the background monitoring system is also connected to a self-servo hydraulic converter (24), and the background monitoring system controls the output pressure of the self-servo hydraulic converter (24) according to the foundation pit deformation obtained by monitoring the built-in sensor.

6. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: The lattice column (21) is a steel lattice column (21A) formed by welding a lattice column angle steel (21-1) and a lattice column tie plate (21-2). The steel lattice column (21A) is pressed into the soil in the following manner: The steel lattice column (21A) is connected to the prestressed prefabricated square pile (11) through a prestressed square pile modification section (13); a steel tray (25) is installed on the top of the prestressed square pile modification section (13); a casing pile driver (300) is sleeved on the outer side of the steel lattice column (21A); the lower end of the casing pile driver (300) abuts against the steel tray (25); and the prestressed square pile section (100) and the steel lattice column (21A) are pressed into the soil to a designed elevation through the static pressure of the casing pile driver (300).

7. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 6 is characterized in that: A pulley stopper (21-4) is also provided on the lattice column plate (21-2) of the steel lattice column (21A). The pulley stopper (21-4) is circumferentially distributed along the inner wall of the casing pile driver (300) and can roll up and down relative to the inner wall of the casing pile driver (300).

8. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: The lattice column (21) is a concrete lattice column (21B), comprising a steel lattice column body welded from a lattice column angle steel (21-1) and a lattice column tie plate (21-2), and reinforced concrete (21-5) poured and filled in the steel lattice column body. The concrete lattice column (21B) is pressed into the soil together with the prestressed square pile segment (100) to a designed elevation by means of a holding pressure.

9. The fully recyclable prestressed square pile plus lattice column combined column pile according to claim 1 is characterized in that: The lattice column (21) is a reinforced steel plate lattice column (21C), comprising a steel lattice column body welded from a lattice column angle steel (21-1) and a lattice column tie plate (21-2), and a reinforced steel sleeve (21-6) sleeved and fixed inside the steel lattice column body, and a reinforced side plate (21-7) located between adjacent lattice column angle steels (21-1) is also fixed on the outer side wall of the reinforced steel sleeve (21-6), and the reinforced steel plate lattice column (21C) is pressed into the soil to a designed elevation together with the prestressed square pile segment (100) by a holding pressure method.

10. The fully recyclable prestressed square pile plus lattice column combined column pile according to any one of claims 1 to 9, characterized in that: The prestressed prefabricated square pile (11), the prestressed square pile modification section (13) and the lattice column (21) at the bottom are provided with lifting holes for matching with the balanced vertical hydraulic jack (500) at intervals in the up-down direction. The balanced vertical hydraulic jack (500) has two symmetrical left and right parts, both of which include a semi-ring fixed seat (51), a fixed plate (52), a hydraulic cylinder (53), a lifting slide (54) and a pushing rod (55). The fixed plate (52) is arranged at the bottom of the semi-ring fixed seat (51). The hydraulic cylinder (53) is fixed on the fixing plate (52), the lifting slide (54) is slidably arranged on the semi-ring fixing seat (51) up and down, and is connected to the driving end of the hydraulic cylinder (53), and the pushing rod (55) is horizontally fixed on the lifting slide (54); the left and right semi-ring fixing seats (51) can be connected to form an annular seat that is engaged on the column pile, and the left and right pushing rods (55) can be axially connected and inserted into corresponding lifting and pulling holes, and the lifting and pulling recovery of the column pile is carried out by using the pushing force generated by the hydraulic cylinder (53).

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