Free angle assembly type threaded expanding body steel pile construction equipment and construction method

Abstract

The invention discloses construction equipment and a construction method for a free-angle assembly type threaded expanding body steel pile, and belongs to the field of foundation pit supporting construction equipment. The construction equipment comprises a static pressure screwing main machine, an angle adjuster and a fixed ground anchor, the angle adjuster can achieve screwing construction of the thread expanding body steel pile at the free angle, the static pressure screwing main machine comprises a static pressure lifting mechanism, a main holding screwing mechanism and an auxiliary holding mechanism, screwing and holding pressing actions are combined together, and the fixed ground anchor is fixed on the fixed ground anchor. The stability and the bearing capacity of the pile body are improved, and the pile is particularly suitable for penetration of hard stratums and can adapt to different stratums and engineering requirements; in addition, a module assembly type design is adopted, all components can be quickly assembled and disassembled, the construction efficiency is improved, and the labor intensity is reduced. A static pressure screwing mode is adopted, and screwing has the characteristic of static pressure at the same time, so that the construction efficiency is greatly improved in the screwing drilling process; meanwhile, large noise and vibration can be avoided, and the influence on the surrounding environment is small.

Description

Technical Field

[0001] The invention relates to foundation pit support construction equipment and a construction method, and more specifically to free-angle assembled threaded enlarged body steel pile construction equipment and a construction method. Background Art

[0002] With the acceleration of urbanization, the development and utilization of underground space has become increasingly important. In the construction of underground projects, foundation pit support structure is the key to ensuring construction safety and project quality. Although traditional foundation pit support methods, such as concrete support and steel sheet piles, can meet the support needs to a certain extent, they have certain limitations, such as low construction efficiency, high cost, great environmental impact, and poor adaptability.

[0003] In order to overcome these shortcomings, the industry has been exploring new foundation pit support technologies. As a new type of support structure, threaded steel piles are gradually gaining attention due to their high bearing capacity, fast construction speed, and strong adaptability. Threaded steel piles are installed by screwing in the soil layer, and the interaction between the threaded steel pile and the soil is used to enhance the friction and shear strength of the soil, thereby improving the overall stability.

[0004] Although the threaded expanded steel pile technology has obvious advantages, it still faces some challenges and problems in the actual construction process. For example, the threaded expanded steel pile construction equipment in the prior art is often complex in structure, inconvenient to operate, limited in construction angle, and not adaptable to some special geological conditions. In addition, the assembly and disassembly process of the existing equipment is time-consuming and labor-intensive, which is not conducive to improving construction efficiency. Summary of the invention

[0005] 1. Technical problem to be solved by the invention

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the existing threaded enlarged body steel pile support construction, and to provide a free-angle assembled threaded enlarged body steel pile construction equipment and construction method. The technical scheme of the present invention can realize the free-angle screwing construction of the threaded enlarged body steel pile, and the screwing and holding actions are combined together, thereby improving the stability and bearing capacity of the pile body, and is particularly suitable for penetrating hard strata, and can adapt to different strata and engineering needs; in addition, a modular assembly design is adopted, and each component can be quickly assembled and disassembled, thereby improving construction efficiency and reducing labor intensity.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] The invention discloses a free-angle assembled threaded enlarged steel pile construction device, comprising a static pressure screwing main unit, an angle adjuster and a fixed ground anchor, wherein:

[0010] The angle adjuster includes a fixed seat and a rotating seat rotatably mounted on the fixed seat and capable of adjusting the tilt angle. The static pressure screwing main unit is detachably fixed on the rotating seat. Both the fixed seat and the rotating seat are provided with steel pile through holes. The fixed ground anchor is fixedly mounted below the fixed seat to overcome the reaction force generated by the static pressure screwing.

[0011] The static pressure screwing main machine includes a static pressure lifting mechanism, a main clamping and screwing mechanism and a secondary clamping mechanism. The static pressure lifting mechanism includes a base plate, a lifting plate and a static pressure oil cylinder. The base plate is detachably fixed on a rotating seat. The lifting plate is located above the base plate. The static pressure oil cylinder is arranged between the base plate and the lifting plate. The main clamping and screwing mechanism is installed on the lifting plate to clamp and drive the working drill rod of the threaded enlarged body steel pile to screw. The secondary clamping mechanism is installed on the base plate to assist in clamping the working drill rod of the threaded enlarged body steel pile. The static pressure lifting mechanism, the main clamping and screwing mechanism and the secondary clamping mechanism have the following matching relationship during construction:

[0012] When the main holding and screwing mechanism holds the working drill rod of the threaded enlarged steel pile, the auxiliary holding mechanism loosens the working drill rod of the threaded enlarged steel pile, and while the main holding and screwing mechanism drives the working drill rod to screw, the static pressure lifting mechanism drives the main holding and screwing mechanism to press down together, so as to realize the screwing and static pressure construction of the threaded enlarged steel pile;

[0013] When the static pressure lifting mechanism moves to the lower limit position of the stroke, the auxiliary clamping mechanism clamps the working drill rod, the main clamping and screwing mechanism releases the working drill rod, and at the same time, the static pressure lifting mechanism drives the main clamping and screwing mechanism to reset upward.

[0014] Furthermore, the fixed seat and the rotating seat are hinged via a rotating shaft, and an angle adjustment cylinder for adjusting the tilt angle of the rotating seat is hingedly installed between the fixed seat and the rotating seat. The fixed seat is also provided with a plurality of anchor rod connecting ear plates for connecting fixed ground anchors.

[0015] Furthermore, the main clamping and screwing mechanism includes a main clamping plate, a main lifting cylinder, a plurality of main clamping claw assemblies, a main clamping claw holding ring, a main wedge ring and a screwing hydraulic motor, the main clamping plate is located above the lifting plate, the main lifting cylinder is arranged between the lifting plate and the main clamping plate, the main clamping claw holding ring is rotatably and axially limitedly installed on the main clamping plate, a plurality of main clamping claw assemblies are circumferentially distributed and arranged on the inner side of the main clamping claw holding ring, the main wedge ring is rotatably and axially limitedly installed on the lifting plate, the inner side of the main wedge ring is provided with a first conical surface, the main clamping claw assembly has a main clamping block matched with the first conical surface, the main clamping block changes the matching position with the first conical surface through the telescopic movement of the main lifting cylinder to achieve clamping or loosening of the working drill rod; the screwing hydraulic motor is installed on the lifting plate, and the screwing hydraulic motor is matched with the main wedge ring through a gear transmission mechanism for driving the screwing movement of the main wedge ring.

[0016] Furthermore, the main claw assembly includes a main mounting block, a main connecting block and a main holding and pressing block, the main mounting block is fixedly mounted on the inner side of the main claw retaining ring, and the upper end of the main holding and pressing block is hinged to the main mounting block through the main connecting block; the main wedge ring is mounted on the lifting plate through a bearing group or a high-load slewing bearing, the outer periphery of the main wedge ring is provided with a first outer gear ring, and the output end of the screwing hydraulic motor is provided with a transmission gear, and the transmission gear is meshed with the first outer gear ring.

[0017] Furthermore, the auxiliary clamping mechanism includes an auxiliary clamping plate, an auxiliary lifting cylinder, a plurality of auxiliary clamping claw assemblies, an auxiliary clamping claw retaining ring and an auxiliary wedge ring, the auxiliary clamping plate is located above the base plate, the auxiliary lifting cylinder is arranged between the base plate and the auxiliary clamping plate, the auxiliary clamping claw retaining ring is fixed on the auxiliary clamping plate, a plurality of auxiliary clamping claw assemblies are circumferentially distributed on the inner side of the auxiliary clamping claw retaining ring, the auxiliary wedge ring is fixed on the base plate, a second conical surface is provided on the inner side of the auxiliary wedge ring, the auxiliary clamping claw assembly has an auxiliary clamping block matched with the second conical surface, and the auxiliary clamping block realizes clamping or loosening of the working drill rod by changing the matching position with the second conical surface through the telescopic movement of the auxiliary lifting cylinder.

[0018] Furthermore, the main holding and screwing mechanism includes a main holding and pressure plate, a main lifting oil cylinder, a rotating ring, a main holding and pressure push block, a main sealing ring and a screwing hydraulic motor, the main holding and pressure plate is located above the lifting plate, the main lifting oil cylinder is arranged between the lifting plate and the main holding and pressure plate, the rotating ring is rotatably and axially limitedly installed on the main holding and pressure plate, a circle of hydraulic oil chamber is arranged on the rotating ring, the outer side of the rotating ring is provided with a main sealing ring for sealing the hydraulic oil chamber, a plurality of piston chambers connected with the hydraulic oil chamber are distributed on the inner side wall of the rotating ring, each of the piston chambers is provided with a main holding and pressure push block, and the outer side of the main sealing ring is also provided with an oil pipe connected to the hydraulic oil chamber, and each of the main holding and pressure push blocks realizes radial telescopic movement along the rotating ring through the oil pressure control in the hydraulic oil chamber; the screwing hydraulic motor is installed on the main holding and pressure plate, and the screwing hydraulic motor cooperates with the rotating ring through a gear transmission mechanism to drive the rotating ring to screw.

[0019] Furthermore, the auxiliary clamping mechanism includes an auxiliary clamping plate, an auxiliary sealing ring, an auxiliary hydraulic push block retaining ring and an auxiliary clamping push block, the auxiliary clamping plate is located above the base plate, the auxiliary lifting cylinder is arranged between the base plate and the auxiliary clamping plate, the auxiliary sealing ring is fixed on the auxiliary clamping plate, the auxiliary hydraulic push block retaining ring is arranged on the inner side of the auxiliary sealing ring, a circle of hydraulic oil chamber sealed by the auxiliary sealing ring is provided on the auxiliary hydraulic push block retaining ring, a plurality of piston chambers communicating with the hydraulic oil chamber are distributed on the inner side wall of the auxiliary hydraulic push block retaining ring, each of the piston chambers is provided with an auxiliary clamping push block, and a hydraulic oil pipe communicating with the hydraulic oil chamber is also provided on the outer side of the auxiliary sealing ring, and each of the auxiliary clamping push blocks realizes radial telescopic movement along the auxiliary hydraulic push block retaining ring through the oil pressure control in the hydraulic oil chamber.

[0020] Furthermore, it also includes a ground anchor hydraulic motor, a transmission box and a centralizer, wherein the transmission box is detachably mounted on the side wall of the lifting plate or the main holding plate, the ground anchor hydraulic motor is mounted on the transmission box and is transmission-connected to the input shaft of the transmission box, and the centralizer is detachably mounted on the base plate and is located directly below the transmission box; during the construction of the fixed ground anchor, the fixed ground anchor and the extension section of the fixed ground anchor are connected to the output shaft of the transmission box, and the fixed ground anchor and the extension section of the fixed ground anchor pass through the centralizer.

[0021] A free-angle assembled threaded enlarged body steel pile construction method of the present invention includes the above-mentioned free-angle assembled threaded enlarged body steel pile construction equipment, and the specific construction method is as follows:

[0022] S1. Ground anchor construction:

[0023] S1-1. Install the anchor hydraulic motor, transmission box and centralizer on the static pressure screwing main machine respectively, and connect the backstage hydraulic pipeline of the anchor hydraulic motor;

[0024] S1-2. Estimate the static pressure twisting reaction force based on the designed pile length of the threaded expanded steel pile, and calculate the required length of the fixed anchor based on the estimated reaction force. The fixed anchor consists of an anchor head and an anchor extension section.

[0025] S1-3, firstly, connect the upper end of the anchor head with the output shaft of the transmission box, adjust the construction position of the anchor head and align it with the ground, start the ground anchor hydraulic motor and the static pressure cylinder to drill the anchor head; after the anchor head is drilled, the anchor head is withdrawn by the reverse rotation of the ground anchor hydraulic motor and the reverse lifting of the static pressure cylinder to form a pre-drilled hole for the anchor head;

[0026] S1-4, installing the ground anchor extension section at the tail of the anchor head, and connecting the upper end of the ground anchor extension section to the output shaft of the transmission box, starting the ground anchor hydraulic motor and the hydrostatic oil cylinder to drill the anchor head and the ground anchor extension section into the pre-drilled hole together; after the drilling is completed, the first ground anchor extension section is withdrawn upward through the reverse rotation of the ground anchor hydraulic motor and the reverse lifting of the hydrostatic oil cylinder;

[0027] S1-5, complete the construction of the ground anchor of the predetermined length in this order; after the ground anchor construction is completed, remove the static pressure screwing host;

[0028] S2. Construction equipment assembly:

[0029] S2-1. Install the fixing base of the angle adjuster on the completed ground anchor and fix it;

[0030] S2-2, using excavation equipment to dig a pile hole below the angle adjuster to facilitate the placement of the threaded enlarged steel pile drill bit section;

[0031] S2-3. Install the static pressure screwing main machine onto the rotating seat of the angle adjuster through the fixing bolts, and connect all the lines and pipelines;

[0032] S2-3, connect the threaded enlarged steel pile drill bit section to the working drill rod and place it in the pile hole;

[0033] S3, static pressure screwing of thread enlarged steel pile:

[0034] S3-1. Pass the working drill rod through the static pressure screwing main machine, and start the main tightening and screwing mechanism to tighten the working drill rod;

[0035] S3-2, simultaneously start the screwing action of the main tightening screwing mechanism and the downward pressing action of the static pressure lifting mechanism, screw and statically press the threaded enlarged steel pile, and construct the drill section of the threaded enlarged steel pile below the ground;

[0036] S3-3, start the auxiliary clamping mechanism to clamp the working drill rod, and reset the static pressure lifting mechanism and the main clamping and screwing mechanism upward; loosen the connecting bolts between the working drill rod and the threaded enlarged body steel pile drill bit section, reinstall the second threaded enlarged body ordinary section at the tail of the threaded enlarged body steel pile drill bit section, and connect the working drill rod to the second threaded enlarged body ordinary section, and repeat step S3-2 to construct the second threaded enlarged body ordinary section below the ground;

[0037] S3-4, repeat step S3-3 to construct the remaining thread expansion body common sections below the ground until the designed pile length is reached;

[0038] S4. Ground anchor removal:

[0039] S4-1. After reaching the designed pile length of the threaded expanded steel pile, disassemble the static pressure screwing main unit and the angle adjuster in sequence;

[0040] S4-2. Place the static pressure screwing machine on the fixed anchor and connect it, and use the reverse rotation of the anchor hydraulic motor to pull out the fixed anchor.

[0041] Furthermore, in step S3, the relative angle between the rotating seat and the fixed seat in the angle adjuster is adjusted according to the anchoring support angle of the threaded enlarged body steel pile, so as to realize free adjustment of the construction angle of the threaded enlarged body steel pile.

[0042] 3. Beneficial effects

[0043] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0044] (1) The present invention provides a free-angle assembled threaded enlarged body steel pile construction equipment and construction method, wherein the construction equipment includes a static pressure screwing main unit, an angle adjuster and a fixed anchor, wherein the angle adjuster can realize the free-angle screwing construction of the threaded enlarged body steel pile, and the static pressure screwing main unit includes a static pressure lifting mechanism, a main clamping screwing mechanism and an auxiliary clamping mechanism, which combine the screwing and clamping actions together, thereby improving the stability and bearing capacity of the pile body, and is particularly suitable for penetrating hard strata, achieving the purpose of penetrating hard strata and reaching the bearing layer, and can adapt to different strata and engineering needs; in addition, a modular assembly design is adopted, and each component can be quickly assembled and disassembled, thereby improving construction efficiency and reducing labor intensity.

[0045] (2) The free-angle assembled threaded enlarged steel pile construction equipment and construction method of the present invention adopt a static pressure screwing method. Compared with the traditional construction method of modifying a screwing machine with an excavator, the construction space restriction is small, and construction can be carried out in complex terrain and space-constrained areas. The screwing also has the characteristics of static pressure, which greatly improves the construction efficiency during the screwing and drilling process; at the same time, it can avoid large noise and vibration, and has little impact on the surrounding environment.

[0046] (3) The present invention provides a free-angle assembled threaded enlarged steel pile construction equipment and construction method, wherein the construction equipment is fully hydraulically driven, has lower energy consumption, is easy to be intelligently controlled, the construction quality can be better guaranteed, and the construction cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a three-dimensional structural schematic diagram of a free-angle assembled threaded enlarged body steel pile construction equipment of the present invention;

[0048] Figure 2 It is a schematic diagram of the construction state structure of a free-angle assembled threaded enlarged body steel pile construction equipment of the present invention;

[0049] Figure 3 It is a schematic diagram of the structure of the combined state of the static pressure screwing main machine and the angle adjuster in the present invention;

[0050] Figure 4 It is a structural schematic diagram of the angle adjuster in the present invention;

[0051] Figure 5 It is a schematic diagram of the three-dimensional structure of the static pressure screwing main machine in Embodiment 1 of the present invention;

[0052] Figure 6 It is a schematic cross-sectional structural diagram of the static pressure screwing main machine in Embodiment 1 of the present invention;

[0053] Figure 7 It is a schematic diagram of the three-dimensional structure of the static pressure screwing main machine in Embodiment 2 of the present invention;

[0054] Figure 8 It is a cross-sectional structural schematic diagram of the static pressure screwing main machine in Example 2 of the present invention;

[0055] Fig. 9 It is a schematic diagram of the combined state of the static pressure screwing main machine as the ground anchor construction equipment in the present invention;

[0056] Fig.10 It is a schematic diagram of the construction state of the ground anchor in the present invention;

[0057] Fig.11 It is a flow chart of a construction method of a free-angle assembled threaded enlarged body steel pile of the present invention;

[0058] Fig.12 It is a schematic diagram of the construction status of a free-angle assembled threaded enlarged body steel pile construction method of the present invention.

[0059] Explanation of the symbols in the schematic diagram:

[0060] 1. Static pressure screwing machine; 11. Static pressure lifting mechanism; 11-1. Bottom plate; 11-2. Lifting plate; 11-3. Static pressure cylinder; 12. Main clamping screwing mechanism; 12-1. Main clamping plate; 12-2. Main lifting cylinder; 12-3. Main clamping claw retaining ring; 12-4. Main mounting block; 12-5. Main connecting block; 12-6. Main clamping block; 12-7. Main wedge ring; 12-7a. First cone surface; 12-7b. First outer gear ring; 12-8. Screwing hydraulic motor; 12-9. Transmission gear; 12-10. Bearing group; 12-1 1. Rotating ring; 12-11a. Second outer gear ring; 12-12. Main holding and pressing block; 12-13. Main sealing ring; 12-14. Support plate; 12-15. Oil pipe; 13. Secondary clamping mechanism; 13-1. Secondary holding and pressing plate; 13-2. Secondary lifting cylinder; 13-3. Secondary holding claw retaining ring; 13-4. Secondary mounting block; 13-5. Secondary connecting block; 13-6. Secondary holding and pressing block; 13-7. Secondary wedge ring; 13-7a. Secondary cone surface; 13-8. Secondary sealing ring; 13-9. Secondary hydraulic pushing block retaining ring; 13-10. Secondary holding and pressing block;

[0061] 2. Angle adjuster; 2-1. Fixed seat; 2-1a. U-shaped hole; 2-2. Rotating seat; 2-2a. Round hole; 2-3. Angle adjustment cylinder; 2-4. Rotating shaft; 2-5. Anchor rod connecting ear plate;

[0062] 3. Fixed ground anchor; 4. Threaded enlarged steel pile; 5. Working drill rod; 6. Ground anchor hydraulic motor; 7. Transmission box; 8. Stabilizer; 9. Ground anchor extension section; 10. Pile hole. DETAILED DESCRIPTION

[0063] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.

[0064] [Example 1]

[0065] Combination Figures 1 to 4 As shown, a free angle assembled thread enlarged steel pile construction equipment of this embodiment includes a static pressure screwing main unit 1, an angle adjuster 2 and a fixed anchor 3. The static pressure screwing main unit 1 is used to perform static pressure screwing on the thread enlarged steel pile 4, the angle adjuster 2 is used to adjust the construction angle of the static pressure screwing main unit 1, and the fixed anchor 3 is used to fix the construction equipment to overcome the static pressure screwing reaction force.

[0066] like Figure 4As shown, the angle adjuster 2 includes a fixed seat 2-1 and a rotating seat 2-2 rotatably mounted on the fixed seat 2-1 and capable of adjusting the tilt angle. The static pressure screwing main unit 1 is detachably fixedly mounted on the rotating seat 2-2. Both the fixed seat 2-1 and the rotating seat 2-2 are provided with steel pile through holes. The fixed ground anchor 3 is fixedly mounted below the fixed seat 2-1 to overcome the reaction force generated by the static pressure screwing. The static pressure screwing main unit 1 and the rotating seat 2-2 can be fixed by bolt locking, and the fixed ground anchor 3 can be fixedly connected to the fixed seat 2-1 by nuts, which is convenient for quick disassembly and assembly. The above-mentioned through holes include a circular hole 2-2a provided on the rotating seat 2-2 and a U-shaped hole 2-1a provided on the fixed seat 2-1. The design of the U-shaped hole 2-1a can facilitate the tilting construction of the threaded expansion body steel pile 4.

[0067] like Figure 3 and Figure 5 As shown, the static pressure screwing main machine 1 includes a static pressure lifting mechanism 11, a main tightening screwing mechanism 12 and an auxiliary tightening mechanism 13. The static pressure lifting mechanism 11 includes a bottom plate 11-1, a lifting plate 11-2 and a static pressure cylinder 11-3. The bottom plate 11-1 is detachably fixedly mounted on the rotating seat 2-2, the lifting plate 11-2 is located above the bottom plate 11-1, and the static pressure cylinder 11-3 is arranged between the bottom plate 11-1 and the lifting plate 11-2. The static pressure cylinder 11-3 can be arranged in four groups, and the four groups of static pressure cylinders 11- The synchronous telescopic movement can drive the lifting plate 11-2 to move up and down, so as to exert static pressure on the threaded enlarged steel pile 4; the main clamping and screwing mechanism 12 is installed on the lifting plate 11-2, and is used to clamp and drive the working drill rod 5 of the threaded enlarged steel pile 4 to screw, and the auxiliary clamping mechanism 13 is installed on the bottom plate 11-1, and is used to assist in clamping the working drill rod 5 of the threaded enlarged steel pile 4; the static pressure lifting mechanism 11, the main clamping and screwing mechanism 12 and the auxiliary clamping mechanism 13 have the following coordination relationship during construction:

[0068] When the main holding and screwing mechanism 12 holds the working drill rod 5 of the threaded enlarged steel pile 4, the auxiliary holding mechanism 13 loosens the working drill rod 5 of the threaded enlarged steel pile 4, and while the main holding and screwing mechanism 12 drives the working drill rod 5 to screw, the static pressure lifting mechanism 11 drives the main holding and screwing mechanism 12 to press down together, so as to realize the screwing and static pressure construction of the threaded enlarged steel pile 4;

[0069] When the static pressure lifting mechanism 11 moves to the lower limit of the stroke, the auxiliary clamping mechanism 13 clamps the working drill rod 5, and the main clamping and screwing mechanism 12 releases the working drill rod 5. At the same time, the static pressure lifting mechanism 11 drives the main clamping and screwing mechanism 12 to reset upward, preparing for the next static pressure screwing action.

[0070] The free-angle assembled threaded enlarged body steel pile construction equipment, whose angle adjuster 2 can realize the free-angle screwing construction of the threaded enlarged body steel pile; the static pressure screwing main unit 1 can combine the screwing and holding pressure actions, thereby improving the stability and bearing capacity of the pile body, and is particularly suitable for penetrating hard strata, achieving the purpose of penetrating hard strata and reaching the bearing layer, and can adapt to different strata and engineering needs; in addition, the modular assembly design is adopted, and the various components can be quickly assembled and disassembled, thereby improving construction efficiency and reducing labor intensity.

[0071] like Figure 3 and Figure 4 As shown, in the above-mentioned angle adjuster 2, the fixed seat 2-1 and the rotating seat 2-2 are hinged by the rotating shaft 2-4, and an angle adjustment cylinder 2-3 for adjusting the tilt angle of the rotating seat 2-2 is also hingedly installed between the fixed seat 2-1 and the rotating seat 2-2. Specifically, one end of the angle adjustment cylinder 2-3 is hinged to the side of the fixed seat 2-1 away from the rotating shaft 2-4, and the other end is hinged to the side of the rotating seat 2-2 away from the rotating shaft 2-4. The rotating seat 2-2 can be driven to rotate around the rotating shaft 2-4 through the telescopic movement of the angle adjustment cylinder 2-3, thereby changing the tilt angle. The above-mentioned angle adjustment cylinder 2-3 can adopt a multi-section cylinder, so that the tilt angle adjustment range of the rotating seat 2-2 is larger. The fixing seat 2-1 is also provided with a plurality of anchor rod connection ear plates 2-5 for connecting the fixed ground anchor 3. The anchor rod connection ear plates 2-5 may be provided with through holes slightly larger than the rod diameter of the fixed ground anchor 3. When connecting the fixed ground anchor 3, the fixed ground anchor 3 or the uppermost ground anchor extension section 9 may be passed through the through holes of the anchor rod connection ear plates 2-5 and locked and fixed with nuts. To ensure the anchoring firmness, the fixed ground anchor 3 is preferably not less than 4 groups. Accordingly, the number and position of the anchor rod connection ear plates 2-5 on the fixing seat 2-1 correspond to the fixed ground anchor 3.

[0072] like Figure 5 and Figure 6As shown, in this embodiment, the main clamping and screwing mechanism 12 includes a main clamping plate 12-1, a main lifting cylinder 12-2, a plurality of main clamping claw assemblies, a main clamping claw retaining ring 12-3, a main wedge ring 12-7 and a screwing hydraulic motor 12-8. The main clamping plate 12-1 is located above the lifting plate 11-2. The main lifting cylinder 12-2 is arranged between the lifting plate 11-2 and the main clamping plate 12-1, and is used to drive the main clamping plate 12-1 to move up and down. The main clamping claw retaining ring 12-3 is rotated and axially limitedly installed on the main clamping plate 12-1. Specifically, a high-load slewing bearing can be used to connect the main clamping claw retaining ring 12-3 and the main clamping plate 12-1, so that the main clamping claw retaining ring 12-3 can rotate stably; a plurality of main clamping claw assemblies are circumferentially distributed. The main wedge ring 12-7 is arranged on the inner side of the main claw retaining ring 12-3, and is rotatably and axially limitedly installed on the lifting plate 11-2. The main wedge ring 12-7 can be specifically installed on the lifting plate 11-2 by using a bearing group 12-10 or a high-load slewing bearing, so that it can rotate stably; the inner side of the main wedge ring 12-7 is provided with a first conical surface 12-7a, and the main claw assembly has a main holding and pressing block 12-6 matched with the first conical surface 12-7a. The main holding and pressing blocks 12-6 distributed on the inner side of the main wedge ring 12-7 form a wedging structure that can hold the threaded enlarged body steel pile. The main holding and pressing block 12-6 changes the matching position with the first conical surface 12-7a through the telescopic movement of the main lifting cylinder 12-2 to achieve the clamping or loosening of the working drill rod 5; Figure 6 As shown, when the main lifting cylinder 12-2 descends, the main holding block 12-6 moves inward, thereby holding the working drill rod 5 tightly. On the contrary, when the main lifting cylinder 12-2 rises, the main holding block 12-6 moves outward, thereby loosening the working drill rod 5. The screwing hydraulic motor 12-8 is installed on the lifting plate 11-2, and the screwing hydraulic motor 12-8 is driven and matched with the main wedge ring 12-7 through a gear transmission mechanism to drive the main wedge ring 12-7 to screw. After the main lifting cylinder 12-2 contracts to hold the working drill rod 5 tightly, the screwing hydraulic motor 12-8 drives the main wedge ring 12-7 to rotate, thereby driving the working drill rod 5 to rotate, and cooperates with the contraction of the static pressure cylinder 11-3 to realize the static pressure screwing construction of the threaded enlarged steel pile.

[0073] like Figure 5 and Figure 6As shown, the main gripper assembly includes a main mounting block 12-4, a main connecting block 12-5 and a main gripping block 12-6. The main mounting block 12-4 is fixedly mounted on the inner side of the main gripper retaining ring 12-3. The upper end of the main gripping block 12-6 is hinged to the main mounting block 12-4 through the main connecting block 12-5. The main wedge ring 12-7 is mounted on the lifting plate 11-2 through a bearing group 12-10 or a high-load slewing bearing. The outer periphery of the main wedge ring 12-7 is provided with a first outer gear ring 12-7b. The output end of the screwing hydraulic motor 12-8 is provided with a transmission gear 12-9. The transmission gear 12-9 is meshed with the first outer gear ring 12-7b. The screwing hydraulic motor 12-8 can drive the main wedge ring 12-7 to rotate. The transmission gear 12-9 can adopt a multi-stage reduction gear set, which can increase the screwing torque of the threaded enlarged steel pile by reducing speed and increasing torque. In addition, the above-mentioned screwing hydraulic motors 12-8 can be provided in multiple groups (such as four groups, etc.), and the multiple groups of screwing hydraulic motors 12-8 can work in coordination to ensure the stability and reliability of the screwing action.

[0074] The clamping principle of the auxiliary clamping mechanism 13 is similar to the clamping principle of the main clamping and screwing mechanism 12. Figure 5 and Figure 6 As shown, the secondary clamping mechanism 13 includes a secondary clamping plate 13-1, a secondary lifting cylinder 13-2, a plurality of secondary clamping claw assemblies, a secondary clamping claw retaining ring 13-3 and a secondary wedge ring 13-7. The secondary clamping plate 13-1 is located above the bottom plate 11-1, the secondary lifting cylinder 13-2 is arranged between the bottom plate 11-1 and the secondary clamping plate 13-1, the secondary clamping claw retaining ring 13-3 is fixed on the secondary clamping plate 13-1, and a plurality of secondary clamping claw assemblies are distributed circumferentially. The auxiliary gripper assembly is arranged on the inner side of the auxiliary gripper retaining ring 13-3, the auxiliary wedge ring 13-7 is fixed on the bottom plate 11-1, the inner side of the auxiliary wedge ring 13-7 is provided with a second cone surface 13-7a, the auxiliary gripper assembly has an auxiliary gripping and pressing block 13-6 matched with the second cone surface 13-7a, and the auxiliary gripping and pressing block 13-6 changes the matching position with the second cone surface 13-7a through the telescopic movement of the auxiliary lifting cylinder 13-2 to achieve gripping or loosening of the working drill rod 5. The above-mentioned auxiliary gripper assembly includes an auxiliary mounting block 13-4, an auxiliary connecting block 13-5 and an auxiliary gripping and pressing block 13-6, the auxiliary mounting block 13-4 is fixedly mounted on the inner side of the auxiliary gripper retaining ring 13-3, and the upper end of the auxiliary gripping and pressing block 13-6 is hinged with the auxiliary mounting block 13-4 through the auxiliary connecting block 13-5.

[0075] Compared with the traditional construction of excavator modified screwdriver, the above-mentioned static pressure screwing method has less construction space restriction and can be used for construction in complex terrain and space-constrained areas. The screwing also has the characteristics of static pressure, which greatly improves the construction efficiency during the screwing drilling process. At the same time, it can avoid loud noise and vibration and has little impact on the surrounding environment.

[0076] like Fig. 9 and Fig.10 As shown, the free angle assembled threaded enlarged steel pile construction equipment of this embodiment also includes a ground anchor hydraulic motor 6, a transmission box 7 and a centralizer 8. The transmission box 7 is detachably mounted on the side wall of the lifting plate 11-2 or the main holding plate 12-1. The ground anchor hydraulic motor 6 is mounted on the transmission box 7 and is connected to the input shaft of the transmission box 7. The centralizer 8 is detachably mounted on the bottom plate 11-1 and is located directly below the transmission box 7. When the fixed ground anchor 3 is constructed, the fixed ground anchor 3 and the ground anchor extension section 9 are connected to the output shaft of the transmission box 7, and the fixed ground anchor 3 and the ground anchor extension section 9 pass through the centralizer 8. The static pressure screwing main unit 1 is used as the main part of the ground anchor construction, so that the distribution position between each ground anchor is easier to determine, which is convenient for the subsequent connection of the angle adjuster 2 with the fixed ground anchor 3. During the construction of the anchor, the anchor hydraulic motor 6 drives the fixed anchor 3 and the anchor extension section 9 to rotate through the transmission box 7, and the telescopic movement of the static pressure cylinder 11-3 can drive the fixed anchor 3 and the anchor extension section 9 to move up and down, thereby realizing the anchoring or extraction of the fixed anchor 3. The straightener 8 can prevent the anchor from tilting and ensure the quality of the anchor construction. The anchoring length of the anchor is calculated by the static pressure screwing reaction force of the threaded expansion steel pile, and the anchor length is extended by the anchor extension section 9.

[0077] Reference Fig.11 and Fig.12 As shown, this embodiment also relates to a free-angle assembled threaded enlarged body steel pile construction method. The threaded enlarged body steel pile construction method includes the above-mentioned free-angle assembled threaded enlarged body steel pile construction equipment, and the specific construction method is as follows:

[0078] S1. Ground anchor construction:

[0079] S1-1, respectively install the anchor hydraulic motor 6, the transmission box 7 and the centralizer 8 on the static pressure screwing main machine 1, and connect the backstage hydraulic pipeline of the anchor hydraulic motor 6;

[0080] S1-2, according to the designed pile length of the threaded enlarged body steel pile, estimate the static pressure screwing reaction force, and calculate the required length of the fixed anchor 3 according to the estimated reaction force, the fixed anchor 3 is composed of an anchor head and an anchor extension section 9;

[0081] S1-3, firstly, connect the upper end of the anchor head with the output shaft of the transmission box 7, adjust the construction position of the anchor head and align it with the ground, start the ground anchor hydraulic motor 6 and the static pressure cylinder 11-3 to drill the anchor head; after the anchor head is drilled, the anchor head is withdrawn by the reverse rotation of the ground anchor hydraulic motor 6 and the reverse lifting of the static pressure cylinder 11-3 to form a pre-drilled hole for the anchor head;

[0082] S1-4, install the ground anchor extension section 9 at the tail of the anchor head, and connect the upper end of the ground anchor extension section 9 to the output shaft of the transmission box 7, start the ground anchor hydraulic motor 6 and the hydrostatic oil cylinder 11-3 to drill the anchor head and the ground anchor extension section 9 into the pre-drilled hole together; after the drilling is completed, the first ground anchor extension section 9 is withdrawn upward through the reverse rotation of the ground anchor hydraulic motor 6 and the reverse lifting of the hydrostatic oil cylinder 11-3;

[0083] S1-5, add the anchor extension section 9 in this order to complete the anchor construction of the predetermined length; after the anchor construction is completed, remove the static pressure screwing main unit 1;

[0084] S2. Construction equipment assembly:

[0085] S2-1, installing the fixing base 2-1 of the angle adjuster 2 on the completed ground anchor and fixing it;

[0086] S2-2, using excavation equipment to dig a pile hole 10 (such as Fig.12 As shown), so as to facilitate the placement of the thread expansion steel pile drill bit section;

[0087] S2-3, install the static pressure screwing main machine 1 on the rotating seat 2-2 of the angle adjuster 2 through the fixing bolts, and connect the lines and pipelines;

[0088] S2-3, connecting the threaded enlarged steel pile drill bit section to the working drill rod and placing it into the pile hole 10;

[0089] S3, static pressure screwing of thread enlarged steel pile:

[0090] S3-1, pass the working drill rod through the static pressure screwing main machine 1, and start the main tightening and screwing mechanism 12 to tighten the working drill rod;

[0091] S3-2, simultaneously start the screwing action of the main tightening screwing mechanism 12 and the downward pressing action of the static pressure lifting mechanism 11, screw and statically press the threaded enlarged steel pile 4, and construct the threaded enlarged steel pile drill bit section below the ground;

[0092] S3-3, start the auxiliary clamping mechanism 13 to clamp the working drill rod, and reset the static pressure lifting mechanism 11 and the main clamping and screwing mechanism 12 upward; loosen the connecting bolts between the working drill rod and the threaded enlarged body steel pile drill bit section, reinstall the second threaded enlarged body ordinary section at the tail of the threaded enlarged body steel pile drill bit section, and connect the working drill rod 5 to the second threaded enlarged body ordinary section, repeat step S3-2 to construct the second threaded enlarged body ordinary section below the ground; fix the drill rods with bolts;

[0093] S3-4, repeat step S3-3, and construct the remaining thread enlarged body common sections below the ground until the designed pile length is reached; the thread enlarged body common sections are provided with spiral blades, and the number of thread enlarged body common sections to be used can be determined according to needs, and the remaining lengthened sections may not be provided with spiral blades;

[0094] S4. Ground anchor removal:

[0095] S4-1. After reaching the designed pile length of the threaded enlarged steel pile, disassemble the static pressure screwing main unit 1 and the angle adjuster 2 in sequence;

[0096] S4-2, placing the static pressure screwing main machine 1 on the fixed anchor 3 and connecting it, and pulling out the fixed anchor 3 by reverse rotation of the anchor hydraulic motor 6.

[0097] In the above step S3, according to the anchoring support angle of the threaded enlarged body steel pile, the relative angle between the rotating seat 2-2 and the fixed seat 2-1 in the angle adjuster 2 is adjusted to achieve free adjustment of the construction angle of the threaded enlarged body steel pile.

[0098] The above-mentioned free-angle assembled threaded enlarged body steel pile construction equipment and construction method, its construction equipment is fully hydraulically driven, the equipment energy consumption is lower, it is easy to intelligently control, the construction quality can be better guaranteed, and the construction cost is lower. The free-angle assembled threaded enlarged body steel pile construction equipment can also be equipped with an intelligent control system and a background hydraulic pump host, which can monitor the construction status in real time and automatically adjust the construction parameters according to the feedback information to ensure the construction quality. According to different geological conditions, adjustable construction parameters can be designed to make the equipment have good adaptability. Before construction, the equipment controller platform can be input according to the preliminary geological survey report. During the formal construction, the rotation speed and static pressure can be adjusted according to different strata to equip the most suitable drilling speed, so as to achieve the purpose of high-efficiency construction. Different sensors can also be equipped on the construction equipment, including: behavior recognition sensor, footage sensor, inclination sensor, pressure sensor, torque sensor, rotation sensor, etc., which can be operated through the handheld tablet background. According to the information data transmitted by various sensors and the pre-input geological report parameters, the construction parameters are adjusted in time to achieve the optimal construction state. At the same time, construction data can be uploaded to the data cloud. The system can present the project's construction digital pile position map, construction progress, construction depth, etc. as needed, and analyze and count the pile driving efficiency, which is convenient for progress management, project profit and quality supervision, and comprehensively improves efficiency and saves costs.

[0099] [Example 2]

[0100] The free-angle assembled threaded enlarged steel pile construction equipment and construction method of this embodiment have the same basic structure and construction principle as the first embodiment, except that:

[0101] With respect to the wedge-tooth structure holding pressure design in Example 1, since the pressure generated comes from the angle of the main holding pressure block 12-6, and since the angle of the main holding pressure block 12-6 is small, the main and auxiliary lifting cylinders need a larger pressure to generate the required holding pressure to hold the threaded enlarged steel pile. This will result in a larger size and a larger number of main and auxiliary lifting cylinders, resulting in a larger power loss and occupied equipment space, which reduces the flexibility of the equipment. To this end, this embodiment provides another structure of a static pressure screwing main machine 1.

[0102] Reference Figure 7 and Figure 8As shown, in the static pressure screwing main machine 1, its main clamping and screwing mechanism 12 includes a main clamping plate 12-1, a main lifting cylinder 12-2, a rotating ring 12-11, a main clamping and pressing push block 12-12, a main sealing ring 12-13 and a screwing hydraulic motor 12-8. The main clamping plate 12-1 is located above the lifting plate 11-2, the main lifting cylinder 12-2 is arranged between the lifting plate 11-2 and the main clamping plate 12-1, and the rotating ring 12-11 rotates and axially limits the position. It is installed on the main holding and pressure plate 12-1. Specifically, a slewing bearing can be used to install the rotating ring 12-11 to ensure the stable rotation of the rotating ring 12-11. A circle of hydraulic oil chamber is provided on the rotating ring 12-11. A main sealing ring 12-13 for sealing the hydraulic oil chamber is provided on the outer side of the rotating ring 12-11 to achieve high-pressure sealing of the hydraulic oil chamber. A circle of support plates 12-14 pressed on the upper and lower ends of the rotating ring 12-11 is also provided at the lower part of the main holding and pressure plate 12-1. A number of piston cavities connected to the hydraulic oil chamber are distributed on the inner wall of the rotating ring 12-11, and a main holding and pressing push block 12-12 is arranged in each piston chamber. The tail of the main holding and pressing push block 12-12 is a piston structure matched with the corresponding piston chamber. The piston structure is specifically a high-strength sealing ring that seals with the piston chamber. An oil pipe 12-15 connected to the hydraulic oil chamber is also arranged on the outer side of the main sealing ring 12-13. Each main holding and pressing push block 12-12 realizes radial telescopic movement along the rotating ring 12-11 through the oil pressure control in the hydraulic oil chamber; the hydraulic oil enters the annular hydraulic oil chamber through the oil pipe 12-15, and the oil pressure can act on the piston at the tail of each main holding and pressing push block 12-12, and then the high-pressure hydraulic oil can be used to drive each main holding and pressing push block 12-12 to tighten or loosen the threaded expansion body steel pile. The screwing hydraulic motor 12-8 is installed on the main holding plate 12-1, and the screwing hydraulic motor 12-8 is matched with the rotating ring 12-11 through the gear transmission mechanism, and is used to drive the rotating ring 12-11 to screw. Specifically, a circle of second outer gear ring 12-11a is provided on the outer side of the rotating ring 12-11, and a transmission gear 12-9 meshing with the second outer gear ring 12-11a is provided on the output shaft of the screwing hydraulic motor 12-8. During the static pressure process, the main lifting cylinder 12-2 can cooperate with the static pressure cylinder 11-3 to perform static pressure on the threaded enlarged body steel pile, increase the single static pressure screwing stroke, and improve the construction efficiency. While performing static pressure, the screwing hydraulic motor 12-8 drives the threaded enlarged body steel pile to screw together.

[0103] The structural principle of the auxiliary clamping mechanism 13 is similar to that of the main clamping and screwing mechanism 12. The auxiliary clamping mechanism 13 includes an auxiliary clamping plate 13-1, an auxiliary sealing ring 13-8, an auxiliary hydraulic push block retaining ring 13-9 and an auxiliary clamping push block 13-10. The auxiliary clamping plate 13-1 is located above the bottom plate 11-1, the auxiliary lifting cylinder 13-2 is arranged between the bottom plate 11-1 and the auxiliary clamping plate 13-1, the auxiliary sealing ring 13-8 is fixed on the auxiliary clamping plate 13-1, the auxiliary hydraulic push block retaining ring 13-9 is arranged on the inner side of the auxiliary sealing ring 13-8, and a circle of hydraulic oil chambers sealed by the auxiliary sealing ring 13-8 are arranged on the auxiliary hydraulic push block retaining ring 13-9. The hydraulic oil chamber is located at A high-strength sealing ring is used to seal between the auxiliary sealing ring 13-8 and the auxiliary hydraulic push block retaining ring 13-9. A number of piston cavities connected to the hydraulic oil chamber are distributed on the inner wall of the auxiliary hydraulic push block retaining ring 13-9. Each piston cavity is provided with an auxiliary holding and pressing push block 13-10. The tail of the auxiliary holding and pressing push block 13-10 is a piston structure matched with the corresponding piston cavity. A hydraulic oil pipe connected to the hydraulic oil chamber is also provided on the outer side of the auxiliary sealing ring 13-8. Each auxiliary holding and pressing push block 13-10 realizes radial telescopic movement along the auxiliary hydraulic push block retaining ring 13-9 through the oil pressure control in the hydraulic oil chamber.

[0104] The static pressure screwing machine 1 in this embodiment adopts the circumferential hydraulic clamping principle, which ensures the clamping force while making the structure simpler and more compact, which is conducive to improving the flexibility of the equipment.

[0105] The free-angle assembled threaded enlarged body steel pile construction equipment and construction method of the present invention can solve the problems of the existing threaded enlarged body steel pile construction equipment, such as complex structure, inconvenient operation, limited construction angle, and poor adaptability under some special geological conditions. It has the following technical effects:

[0106] 1. The construction equipment includes a static pressure screwing machine, an angle adjuster and a fixed anchor. The angle adjuster can realize the screwing construction of the threaded expanded steel pile at a free angle. The static pressure screwing machine includes a static pressure lifting mechanism, a main clamping screwing mechanism and an auxiliary clamping mechanism, which combine the screwing and clamping actions to improve the stability and bearing capacity of the pile body. It is especially suitable for penetrating hard strata, achieving the purpose of penetrating hard strata and reaching the bearing layer, and can adapt to different strata and engineering needs. In addition, the modular assembly design is adopted, and each component can be quickly assembled and disassembled, which improves construction efficiency and reduces labor intensity.

[0107] 2. The static pressure screwing method is adopted. Compared with the traditional construction of excavator modified screwing machine, the construction space restriction is small, and construction can be carried out in complex terrain and space-constrained areas. The screwing also has the characteristics of static pressure, which greatly improves the construction efficiency during the screwing drilling process; at the same time, it can avoid large noise and vibration, and has little impact on the surrounding environment.

[0108] 3. The construction equipment is fully hydraulically driven, with lower energy consumption and easy intelligent control. The construction quality can be better guaranteed and the construction cost is lower.

[0109] 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 free-angle assembled threaded enlarged steel pile construction equipment, characterized in that: It comprises a static pressure screwing main machine (1), an angle adjuster (2) and a fixed ground anchor (3), wherein: The angle adjuster (2) comprises a fixed seat (2-1) and a rotating seat (2-2) rotatably mounted on the fixed seat (2-1) and capable of adjusting the tilt angle; the static pressure screwing main unit (1) is detachably fixedly mounted on the rotating seat (2-2); both the fixed seat (2-1) and the rotating seat (2-2) are provided with steel pile through holes; the fixed ground anchor (3) is fixedly mounted below the fixed seat (2-1) and is used to overcome the reaction force generated by the static pressure screwing; The static pressure screwing main machine (1) comprises a static pressure lifting mechanism (11), a main clamping screwing mechanism (12) and a secondary clamping mechanism (13); the static pressure lifting mechanism (11) comprises a base plate (11-1), a lifting plate (11-2) and a static pressure oil cylinder (11-3); the base plate (11-1) is detachably fixedly mounted on a rotating seat (2-2); the lifting plate (11-2) is located above the base plate (11-1); and the static pressure oil cylinder (11-3) is arranged on the base plate (11-1). and the lifting plate (11-2); the main clamping and screwing mechanism (12) is installed on the lifting plate (11-2) and is used to clamp and drive the working drill rod (5) of the threaded enlarged steel pile (4) to screw; the auxiliary clamping mechanism (13) is installed on the bottom plate (11-1) and is used to assist in clamping the working drill rod (5) of the threaded enlarged steel pile (4); the static pressure lifting mechanism (11), the main clamping and screwing mechanism (12) and the auxiliary clamping mechanism (13) have the following matching relationship during construction: When the main clamping and screwing mechanism (12) clamps the working drill rod (5) of the threaded enlarged steel pile (4), the secondary clamping mechanism (13) loosens the working drill rod (5) of the threaded enlarged steel pile (4), and while the main clamping and screwing mechanism (12) drives the working drill rod (5) to screw, the static pressure lifting mechanism (11) drives the main clamping and screwing mechanism (12) to press down together, so as to realize the static pressure construction of the threaded enlarged steel pile (4) while screwing; When the static pressure lifting mechanism (11) moves to the lower limit position of the stroke, the secondary clamping mechanism (13) clamps the working drill rod (5), the main clamping and screwing mechanism (12) releases the working drill rod (5), and at the same time, the static pressure lifting mechanism (11) drives the main clamping and screwing mechanism (12) to reset upwards.

2. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 1 is characterized by: The fixed seat (2-1) and the rotating seat (2-2) are hingedly connected via a rotating shaft (2-4); an angle adjustment cylinder (2-3) for adjusting the tilt angle of the rotating seat (2-2) is also hingedly installed between the fixed seat (2-1) and the rotating seat (2-2); and a plurality of anchor rod connecting ear plates (2-5) for connecting and fixing ground anchors (3) are also provided on the fixed seat (2-1).

3. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 1 is characterized by: The main clamping and screwing mechanism (12) comprises a main clamping plate (12-1), a main lifting cylinder (12-2), a plurality of main clamping claw assemblies, a main clamping claw retaining ring (12-3), a main wedge ring (12-7) and a screwing hydraulic motor (12-8); the main clamping plate (12-1) is located above the lifting plate (11-2); the main lifting cylinder (12-2) is arranged between the lifting plate (11-2) and the main clamping plate (12-1); the main clamping claw retaining ring (12-3) is rotatably and axially limitedly mounted on the main clamping plate (12-1); a plurality of main clamping claw assemblies are circumferentially distributed on the inner side of the main clamping claw retaining ring (12-3); the main wedge ring (12-7) is rotatably and axially limitedly mounted on the main clamping plate (12-1); The main wedge ring (12-7) is axially limitedly mounted on the lifting plate (11-2); a first conical surface (12-7a) is provided on the inner side of the main wedge ring (12-7); the main claw assembly has a main holding and pressing block (12-6) matched with the first conical surface (12-7a); the main holding and pressing block (12-6) changes the matching position with the first conical surface (12-7a) through the telescopic movement of the main lifting cylinder (12-2) to achieve the clamping or loosening of the working drill rod (5); the screwing hydraulic motor (12-8) is mounted on the lifting plate (11-2); the screwing hydraulic motor (12-8) is matched with the main wedge ring (12-7) through a gear transmission mechanism, and is used to drive the main wedge ring (12-7) to perform screwing movement.

4. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 3 is characterized by: The main gripping claw assembly comprises a main mounting block (12-4), a main connecting block (12-5) and a main gripping and pressing block (12-6); the main mounting block (12-4) is fixedly mounted on the inner side of the main gripping claw retaining ring (12-3); the upper end of the main gripping and pressing block (12-6) is hingedly connected to the main mounting block (12-4) through the main connecting block (12-5); the main wedge ring (12-7) is mounted on the lifting plate (11-2) through a bearing group (12-10) or a high-load slewing bearing; the outer periphery of the main wedge ring (12-7) is provided with a first outer gear ring (12-7b); the output end of the screwing hydraulic motor (12-8) is provided with a transmission gear (12-9); the transmission gear (12-9) is meshed with the first outer gear ring (12-7b).

5. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 3 is characterized by: The secondary clamping mechanism (13) comprises a secondary clamping plate (13-1), a secondary lifting cylinder (13-2), a plurality of secondary clamping claw assemblies, a secondary clamping claw retaining ring (13-3) and a secondary wedge clamping ring (13-7); the secondary clamping plate (13-1) is located above the bottom plate (11-1); the secondary lifting cylinder (13-2) is arranged between the bottom plate (11-1) and the secondary clamping plate (13-1); the secondary clamping claw retaining ring (13-3) is fixed on the secondary clamping plate (13-1); and the plurality of secondary clamping claw assemblies are circumferentially distributed. The auxiliary clamping claw assembly is arranged on the inner side of the auxiliary clamping claw retaining ring (13-3), the auxiliary wedge-locking ring (13-7) is fixed on the bottom plate (11-1), the inner side of the auxiliary wedge-locking ring (13-7) is provided with a second conical surface (13-7a), the auxiliary clamping claw assembly has an auxiliary clamping block (13-6) matched with the second conical surface (13-7a), and the auxiliary clamping block (13-6) changes the matching position with the second conical surface (13-7a) through the telescopic movement of the auxiliary lifting cylinder (13-2) to achieve clamping or loosening of the working drill rod (5).

6. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 1 is characterized by: The main clamping and screwing mechanism (12) comprises a main clamping plate (12-1), a main lifting cylinder (12-2), a rotating ring (12-11), a main clamping push block (12-12), a main sealing ring (12-13) and a screwing hydraulic motor (12-8); the main clamping plate (12-1) is located above the lifting plate (11-2); the main lifting cylinder (12-2) is arranged between the lifting plate (11-2) and the main clamping plate (12-1); the rotating ring (12-11) is rotatably and axially limitedly mounted on the main clamping plate (12-1); a circle of hydraulic oil chambers is arranged on the rotating ring (12-11); and a main sealing ring for sealing the hydraulic oil chamber is arranged on the outer side of the rotating ring (12-11). The main sealing ring (12-13) is provided with a plurality of piston cavities connected with the hydraulic oil cavity on the inner side wall of the rotating ring (12-11), each of the piston cavities is provided with a main holding and pressing push block (12-12), and the outer side of the main sealing ring (12-13) is also provided with an oil pipe (12-15) connected with the hydraulic oil cavity, and each of the main holding and pressing push blocks (12-12) realizes radial telescopic movement along the rotating ring (12-11) through the oil pressure control in the hydraulic oil cavity; the screwing hydraulic motor (12-8) is installed on the main holding and pressing plate (12-1), and the screwing hydraulic motor (12-8) is matched with the rotating ring (12-11) through a gear transmission mechanism, and is used to drive the rotating ring (12-11) to screw.

7. The free-angle assembled threaded enlarged body steel pile construction equipment according to claim 6 is characterized by: The secondary clamping mechanism (13) comprises a secondary clamping plate (13-1), a secondary sealing ring (13-8), a secondary hydraulic push block retaining ring (13-9) and a secondary clamping push block (13-10); the secondary clamping plate (13-1) is located above the bottom plate (11-1); the secondary lifting cylinder (13-2) is arranged between the bottom plate (11-1) and the secondary clamping plate (13-1); the secondary sealing ring (13-8) is fixed on the secondary clamping plate (13-1); the secondary hydraulic push block retaining ring (13-9) is arranged on the inner side of the secondary sealing ring (13-8); The auxiliary hydraulic push block retaining ring (13-9) is provided with a circle of hydraulic oil chambers sealed by an auxiliary sealing ring (13-8); a plurality of piston chambers communicating with the hydraulic oil chamber are distributed on the inner side wall of the auxiliary hydraulic push block retaining ring (13-9); each of the piston chambers is provided with an auxiliary holding and pressing push block (13-10); a hydraulic oil pipe communicating with the hydraulic oil chamber is also provided on the outer side of the auxiliary sealing ring (13-8); each of the auxiliary holding and pressing push blocks (13-10) realizes radial telescopic movement along the auxiliary hydraulic push block retaining ring (13-9) through oil pressure control in the hydraulic oil chamber.

8. The free-angle assembled threaded enlarged body steel pile construction equipment according to any one of claims 3 to 7, characterized in that: It also includes a ground anchor hydraulic motor (6), a transmission box (7) and a centralizer (8), wherein the transmission box (7) is detachably mounted on the side wall of the lifting plate (11-2) or the main holding plate (12-1), the ground anchor hydraulic motor (6) is mounted on the transmission box (7) and is in driving connection with the input shaft of the transmission box (7), and the centralizer (8) is detachably mounted on the bottom plate (11-1) and is located directly below the transmission box (7); when the fixed ground anchor (3) is being constructed, the fixed ground anchor (3) and the extension section of the fixed ground anchor (3) are connected to the output shaft of the transmission box (7), and the fixed ground anchor (3) and the extension section of the fixed ground anchor (3) pass through the centralizer (8).

9. A method for constructing a free-angle assembled threaded enlarged steel pile, characterized in that: The free-angle assembled threaded enlarged steel pile construction equipment according to claim 8 is provided, and the specific construction method is as follows: S1. Ground anchor construction: S1-1, respectively install the anchor hydraulic motor (6), the transmission box (7) and the centralizer (8) on the static pressure screwing main machine (1), and connect the rear hydraulic pipeline of the anchor hydraulic motor (6); S1-2, based on the designed pile length of the threaded enlarged steel pile, the static pressure twisting reaction force is estimated, and based on the estimated reaction force, the required length of the fixed anchor (3) is calculated, the fixed anchor (3) is composed of an anchor head and an anchor extension section (9); S1-3, firstly, the upper end of the anchor head is connected to the output shaft of the transmission box (7), the construction position of the anchor head is adjusted and aligned with the ground, and the ground anchor hydraulic motor (6) and the static pressure oil cylinder (11-3) are started to drill into the anchor head; after the anchor head is drilled, the anchor head is withdrawn through the reverse rotation of the ground anchor hydraulic motor (6) and the reverse lifting of the static pressure oil cylinder (11-3), so as to form a pre-drilled hole for the anchor head; S1-4, installing the ground anchor extension section (9) at the tail of the anchor head, connecting the upper end of the ground anchor extension section (9) to the output shaft of the transmission box (7), starting the ground anchor hydraulic motor (6) and the static pressure cylinder (11-3) to drill the anchor head and the ground anchor extension section (9) into the pre-drilled hole together; After drilling is completed, the first anchor extension section (9) is withdrawn upward through the reverse rotation of the anchor hydraulic motor (6) and the reverse lifting of the static pressure cylinder (11-3); S1-5, completing the construction of the ground anchor of a predetermined length in this order; after the ground anchor construction is completed, removing the static pressure screwing main machine (1); S2. Construction equipment assembly: S2-1, installing the fixing base (2-1) of the angle adjuster (2) on the completed ground anchor and fixing it; S2-2, using excavation equipment to dig a pile hole (10) below the angle adjuster (2) to facilitate the placement of the threaded enlarged steel pile drill bit section; S2-3, install the static pressure screwing main machine (1) onto the rotating seat (2-2) of the angle adjuster (2) by means of fixing bolts, and connect all lines and pipelines; S2-3, connecting the threaded enlarged steel pile drill bit section to the working drill rod and placing it into the pile hole (10); S3, static pressure screwing of thread enlarged steel pile: S3-1, passing the working drill rod through the static pressure screwing main machine (1), and starting the main tightening and screwing mechanism (12) to tighten the working drill rod; S3-2, simultaneously starting the screwing action of the main tightening screwing mechanism (12) and the downward pressing action of the static pressure lifting mechanism (11), screwing and static pressure construction of the threaded enlarged steel pile (4), and constructing the drill section of the threaded enlarged steel pile below the ground; S3-3, start the auxiliary clamping mechanism (13) to clamp the working drill rod, and reset the static pressure lifting mechanism (11) and the main clamping and screwing mechanism (12) upward; loosen the connecting bolts between the working drill rod and the threaded enlarged body steel pile drill bit section, reinstall the second threaded enlarged body ordinary section at the tail of the threaded enlarged body steel pile drill bit section, and connect the working drill rod to the second threaded enlarged body ordinary section, and repeat step S3-2 to construct the second threaded enlarged body ordinary section below the ground; S3-4, repeat step S3-3 to construct the remaining thread expansion body common sections below the ground until the designed pile length is reached; S4. Ground anchor removal: S4-1. After the designed pile length of the threaded enlarged steel pile is reached, the static pressure screwing main machine (1) and the angle adjuster (2) are disassembled in sequence; S4-2, placing the static pressure screwing main machine (1) on the fixed ground anchor (3) and connecting it, and pulling out the fixed ground anchor (3) by utilizing the reverse rotation of the ground anchor hydraulic motor (6).

10. The free-angle assembled threaded enlarged steel pile construction method according to claim 9, characterized in that: In step S3, the relative angle between the rotating seat (2-2) and the fixed seat (2-1) in the angle adjuster (2) is adjusted according to the anchoring support angle of the threaded enlarged body steel pile, so as to realize free adjustment of the construction angle of the threaded enlarged body steel pile.

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