Soft-meshing cutting-free pile forming construction method for secant pile prefabricated box

Abstract

The invention discloses a soft-meshing cutting-free pile forming construction method for a secant pile prefabricated box, and belongs to the technical field of constructional engineering.The construction method is based on a connector box and an orifice platform matched with the connector box and comprises the steps that S1, construction preparation is conducted; s2, guide wall construction; s3, rotary digging and hole forming; s4, mounting an orifice platform; s5, mounting a joint box body; s6, mounting a perfusion catheter; s7, plain pile concrete pouring; s8, the connector box body is pulled out; and S9, meat pile construction. The occlusion space of the plain pile is filled with the connector box, concrete pouring is not needed, the material cost is reduced, work efficiency reduction and waste residue outward transportation caused by concrete cutting of the part are reduced, meanwhile, the orifice platform and the connector box can be repeatedly used, the overall construction cost is greatly reduced, and the construction efficiency is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method for a prefabricated box body of an interlocking pile with soft interlocking and no-cutting pile formation. Background Art

[0002] Interlocking piles, a commonly used retaining structure for open-cut foundation pits at subway stations, refer to continuous pile walls formed by the interlocking and overlapping of concrete piles, which have the function of retaining soil and stopping water. Common interlocking piles adopt the rotary drilling hard interlocking construction method. When drilling the piles, the drill barrel must first cut the concrete of the piles, and then the rotary drilling bucket must be replaced to remove the slag. Hard cutting concrete drilling is time-consuming, and frequent replacement of drill tools affects drilling efficiency. At the same time, the interlocking drilling is affected by the difference in concrete strength of the piles on both sides, which can easily lead to a certain degree of tilt during interlocking drilling. When the excavation depth of the foundation pit is greater than 15m, it is easy to cause interlocking forks and leakage between piles at the bottom of the foundation pit. In addition, the concrete at the cut interlocking part becomes drill slag discharge, resulting in waste of concrete materials.

[0003] Therefore, it is urgent to design a soft-interlocking and cutting-free pile construction method for prefabricated interlocking pile boxes to solve the above-mentioned problems of interlocking forks and leakage between piles at the bottom of the foundation pit during interlocking drilling. Summary of the Invention

[0004] In order to solve the technical problem mentioned in the background technology that interlocking drilling easily causes interlocking forks and leakage between piles at the bottom of the foundation pit, a construction method for interlocking pile prefabricated boxes with soft interlocking and no cutting is provided to solve the above problems.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the construction method of the occlusal pile prefabricated box soft occlusal cutting-free pile is as follows: A construction method for soft-engaging and cutting-free pile formation of a prefabricated box of an interlocking pile, based on a joint box and an orifice platform matched with the joint box, comprises: S1. Construction preparation; S2, guide wall construction; S3, rotary digging into holes; S4, installation of orifice platform; S5. Installation of connector box; S6, perfusion catheter installation; S7, pouring concrete for piles; S8, remove the connector box; S9, construction of meat piles.

[0006] Furthermore, S1 includes: Remove surface debris, fill and compact the ground, and place steel plates for the rotary drilling rig to bear the weight. Based on the coordinates of the pile centerline, use a total station to conduct on-site layout based on the ground wire control points, and prepare pile guards to serve as the control center line for guide wall construction.

[0007] Furthermore, in S2, after the excavation of the guide wall is completed, the center line is introduced into the trench for the alignment of the bottom formwork and the formwork to ensure that the center line of the guide wall is accurate. The steel bars are tied, and the guide wall steel bars are arranged in a double layer and in two directions. Customized steel formwork is used to support and fix the formwork, and then poured with concrete.

[0008] Further, in S4, the orifice platform includes: The bottom plate has a perfusion hole in the center, and a perfusion valve is symmetrically hinged on the bottom to guide and position the perfusion catheter extending into the perfusion hole. Two slot holes matching the joint box are provided on the bottom. Adjustment devices are provided on both sides of the bottom plate. The adjustment device includes a cylinder. The output end of the cylinder is fixedly connected to an L-shaped support plate, and two fixed brackets are fixedly connected to the L-shaped support plate. A snap-fit ​​recess is provided on the joint box, and a channel steel is provided between the snap-fit ​​recess and the fixed bracket. The movement of the fixed bracket is controlled by the cylinder, so that the channel steel is snapped and tightly fixed to the joint box. The bottom of the cylinder is fixedly connected to a fixed plate for supporting the cylinder, and the fixed plate is fixedly connected to the bottom plate.

[0009] Furthermore, the installation of the hole mouth platform uses GPS to verify the center position of the pile hole and the cross line, and draws out the center point of the pile hole to determine the center position of the hole mouth platform. A crane is used to lower the hole mouth platform to the top of the pile hole, and the hole mouth platform is manually positioned so that the center position of the hole mouth platform coincides with the center position of the pile hole, and the central axis of the hole mouth platform coincides with the center line of the interlocking pile. A spirit level is used to check the levelness of the hole mouth platform, and pads are used for adjustment to ensure that the opening platform is centered and placed horizontally.

[0010] Further, in S5, the joint box includes a connecting joint and a connecting box, the shapes of the connecting joint and the connecting box both match the shape of the slot hole, the bottom of the connecting joint is fixedly connected to a joint section, the top of the connecting box is fixedly connected to a positioning frame, the positioning frame matches the joint section, the bottom of the connecting joint is provided with two symmetrical support rollers, the top of the connecting box is provided with two semicircular tracks, the semicircular tracks are provided for the movement of the support rollers, a landing hole is provided between the two semicircular tracks, the landing hole is used to accommodate the support rollers, the edges of the semicircular tracks are provided with guide baffles for guiding and limiting the support rollers, and the top of the connecting joint is fixedly connected to a steel vibration rod; The support roller of the connecting joint is in contact with the semicircular track, and the connecting joint is rotated to make the support roller enter the positioning hole, thereby connecting the positioning frame and the joint section. After fixing the positioning frame and the joint section, the installation of the joint box is completed; It also includes an intermediate box body, which is located between the connecting joint and the connecting box body. The top of the intermediate box body has the same structure as the top of the connecting box body, and the bottom of the intermediate box body has the same structure as the bottom of the connecting joint. The connecting joint, the connecting box body and the side of the intermediate box body are all provided with snap-in recesses.

[0011] Furthermore, a crane is used to lift the joint box through the slot hole and insert it downward into the pile hole. When the lower end of the joint box abuts the bottom of the pile hole, the upper end of the joint box extends to the top of the hole mouth platform to form an upper extension section. The upper extension section is fixedly connected to the hole mouth platform to keep the position of the joint box fixed.

[0012] Furthermore, when the lower end of the joint box abuts against the bottom of the pile hole, the clamping recess of the connecting joint is clamped on the hole platform through the channel steel to prevent the joint box from falling. Then, the movement of the cylinder of the hole platform is controlled, and the cylinder drives the fixed bracket to press the channel steel tightly into the clamping recess to ensure the verticality of the joint box.

[0013] further, In S6, the grouting conduit is passed through the grouting hole, the lower end of the grouting conduit extends into the pile hole, and a distance of 0.5 m is maintained from the bottom of the pile hole. The upper end of the grouting conduit is located above the orifice platform, thereby being clamped and fixed by the orifice platform. The lower end of the hopper is inserted into the upper end of the grouting conduit, and concrete is poured into the pile hole through the hopper and the grouting conduit. The height of the orifice platform where the grouting conduit extends is not less than 0.8 m. In S7, before pouring the pile concrete, the sediment thickness at the bottom of the pile hole needs to be measured. If it exceeds the standard, air lift reverse circulation is used to clean the hole. When the pile concrete is initially poured, ensure that the pouring pipe is buried in the concrete to a depth of not less than 0.8m. During the pouring process, maintain continuous pouring, and always control the depth of the pouring pipe in the concrete to be between 2m and 4m. The over-pouring height of the pile top is not less than 50cm. When the pile top is close to the ground, ensure that the concrete on the pile top is fully slurried.

[0014] Furthermore, in S8, after the pile concrete is poured, a hammer is used to strike the steel vibrating rod on the top of the joint box, and a 1000 Hz tuning fork is used for judgment. When the 1000 Hz tuning fork resonates, the joint box is removed.

[0015] The soft-occlusal cutting-free pile construction method of the prefabricated box of the occlusal pile of the present invention has the following advantages: The present invention adopts the joint box to fill the bite space of the plain pile. When drilling the concrete pile hole later, there is no need to cut the concrete of the plain pile. In addition, the plain pile can serve as a guide and wall protection for drilling the concrete pile hole, preventing the hole from being skewed due to uneven force during cutting caused by the difference in concrete strength on both sides, ensuring the verticality and bite effect of the pile body, and the pile quality of the support system is good.

[0016] The interlocking space of the plain pile of the present invention is filled with the joint box, and there is no need to pour concrete, which reduces material costs and reduces the reduced work efficiency and waste slag transportation caused by the cutting of this part of the concrete. At the same time, the hole platform and the joint box can be reused, the overall construction cost is greatly reduced, and the construction efficiency is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the construction method for the soft-occlusal cutting-free pile formation of the prefabricated box body of the occlusal pile of the present invention; Figure 2 Schematic diagram of the orifice platform structure of the present invention; Figure 3 This is a schematic structural diagram of the joint box of the present invention; Figure 4 It is a schematic diagram of the connection box structure of the present invention.

[0018] Explanation of the marks in the figure: 1. Orifice platform; 11. Bottom plate; 12. Perfusion hole; 13. Perfusion valve; 14. Slot hole; 15. Adjustment device; 151. Cylinder; 152. L-shaped support plate; 153. Fixed bracket; 16. Fixed plate; 2. Joint box; 21. Connecting joint; 211. Joint section; 212. Support roller; 22. Connecting box; 221. Positioning frame; 222. Semicircular track; 223. Guide baffle; 224. Landing hole; 23. Snap-in recess; 24. Steel vibration rod. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is intended to be within the scope of the present invention and to form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To the attached Figure 4 The invention describes a method for constructing piles by soft-engaging and cutting-free prefabricated box bodies of the present invention.

[0022] With the development of urban construction and the exploitation and utilization of underground space, interlocking piles, a commonly used construction method for retaining structures in open excavation pits of subway stations, are continuous pile walls formed by interlocking and overlapping concrete piles with soil retaining and water stopping functions. In the rotary drilling hard interlocking construction method, the drill barrel must be used to cut the pile concrete first, and then the rotary drilling bucket is replaced to remove the slag. Hard cutting concrete drilling is time-consuming, and frequent replacement of drill tools affects drilling efficiency. At the same time, the interlocking drilling is affected by the difference in concrete strength of the piles on both sides, which can easily lead to a certain degree of tilt during interlocking drilling. When the excavation depth of the foundation pit is greater than 15m, interlocking forks and leakage between piles are likely to occur at the bottom of the foundation pit. In addition, the concrete at the cut interlocking part becomes drill slag, resulting in waste of concrete materials.

[0023] Therefore, the present invention provides a method for constructing a prefabricated box body of a occlusal pile without cutting, and the method is based on a joint box body 2 and an orifice platform 1 matched with the joint box body 2. Figure 1 Shown, including: S1. Construction preparation; Remove surface debris, fill and compact the ground, and place steel plates for the rotary drilling rig to bear the weight. Based on the coordinates of the pile centerline, use a total station to conduct on-site layout based on the ground wire control points, and prepare pile guards to serve as the control center line for guide wall construction.

[0024] S2, guide wall construction; After the guide wall excavation is completed, the center line is introduced into the trench for the alignment of the bottom formwork and the formwork to ensure that the center line of the guide wall is accurate. The steel bars are tied and the guide wall steel bars are arranged in a double layer and in two directions. Customized steel formwork is used to support and fix the formwork and then poured with concrete.

[0025] S3, rotary digging into holes; After the rotary drilling rig is brought to the site and assembled, the axis is measured and laid out according to the pile position. After the pile position is reviewed and accepted, the rotary drilling rig is put into place and the posture is adjusted. The rotary drilling speed is controlled according to the geological conditions. When constructing in miscellaneous fill layers that are prone to collapse and necking, the number of up and down drilling of the drill bit should be appropriately increased to consolidate the soil of the hole wall. When penetrating soft plastic or hard plastic soil layers, the rotary drilling speed should be appropriately accelerated to improve work efficiency. When entering moderately weathered hard soil layers, the drilling speed should be slowed down. If drilling is difficult, it is necessary to replace it with a rock-embedded barrel drill to cooperate with the construction to complete the rotary drilling of the pile hole.

[0026] S4, installation of orifice platform 1; like Figure 2As shown, the orifice platform 1 includes: a bottom plate 11, a perfusion hole 12 is provided in the center of the bottom plate 11, a perfusion valve 13 is symmetrically hinged on the bottom to guide and position the perfusion catheter extending into the perfusion hole 12, two slot holes 14 matching the joint box 2 are provided on the bottom, and an adjustment device 15 is provided on both sides of the bottom plate 11. The adjustment device 15 includes a cylinder 151, and the output end of the cylinder 151 is fixedly connected to an L-shaped support plate 152, and two fixing brackets 153 are fixedly connected to the L-shaped support plate 152. A snap-fit ​​recess 23 is provided on the joint box 2, and a channel steel is provided between the snap-fit ​​recess 23 and the fixing bracket 153. The movement of the fixing bracket 153 is controlled by the cylinder 151, so that the channel steel is snapped and tightly fixed to the joint box 2. The bottom of the cylinder 151 is fixedly connected to a fixing plate 16 for supporting the cylinder 151, and the fixing plate 16 is fixedly connected to the bottom plate 11; The installation of the hole mouth platform 1 uses GPS to verify the center position of the pile hole and the cross line, and draws out the center point of the pile hole to determine the center position of the hole mouth platform 1. The hole mouth platform 1 is lowered to the top of the pile hole by a crane, and the hole mouth platform 1 is manually positioned so that the center position of the hole mouth platform 1 coincides with the center position of the pile hole, and the central axis of the hole mouth platform 1 coincides with the center line of the interlocking pile. The level of the hole mouth platform 1 is detected with a spirit level, and pads are used for adjustment to ensure that the opening platform is centered and placed horizontally.

[0027] S5, installation of connector box 2; like Figure 3 and Figure 4 As shown, the joint box 2 includes a connecting joint 21 and a connecting box 22. The shapes of the connecting joint 21 and the connecting box 22 match the shape of the slot hole 14. The bottom of the connecting joint 21 is fixedly connected to a joint section 211, and the top of the connecting box 22 is fixedly connected to a positioning frame 221. The positioning frame 221 matches the joint section 211. Two symmetrical support rollers 212 are provided at the bottom of the connecting joint 21, and two semicircular tracks 222 are provided at the top of the connecting box 22. The semicircular tracks 222 are used for the movement of the support rollers 212. A landing hole 224 is provided between the two semicircular tracks 222. The landing hole 224 is used to accommodate the support rollers 212. A guide baffle 223 is provided on the edge of the semicircular track 222 for guiding and limiting the support rollers 212. A steel vibration rod 24 is fixedly connected to the top of the connecting joint 21. The support roller 212 of the connecting joint 21 abuts against the semicircular track 222, and the connecting joint 21 is rotated to make the support roller 212 enter the landing hole 224, thereby connecting the positioning frame 221 to the joint section 211. After fixing the positioning frame 221 and the joint section 211, the installation of the joint box 2 is completed; specifically, the positioning frame 221 and the joint section 211 are connected by bolts. In a specific embodiment, the positioning frame 221 and the joint section 211 are both provided with through holes, and the bolts enter the through holes of the joint section 211 from the through holes at one end of the positioning frame 221, extend from the through holes at the other end of the positioning frame 221, and are fixed by nuts.

[0028] The intermediate box body is also included (not shown in the figure). The intermediate box body is located between the connecting joint 21 and the connecting box body 22. The top of the intermediate box body has the same structure as the top of the connecting box body 22, and the bottom of the intermediate box body has the same structure as the bottom of the connecting joint 21. The connecting joint 21, the connecting box body 22 and the side of the intermediate box are all provided with a snap-fit ​​notch 23. The joint box 2 is lifted by a crane and passed through the slot hole 14, and inserted downward into the pile hole. When the lower end of the joint box 2 abuts against the bottom of the pile hole, the upper end of the joint box 2 extends to the top of the hole platform 1 to form an upper extension section. The upper extension section is fixedly connected to the hole platform 1 to keep the joint box 2 in a fixed position. When the lower end of the joint box 2 abuts against the bottom of the pile hole, the clamping recess 23 of the connecting joint 21 is clamped on the orifice platform 1 through the channel steel to prevent the joint box 2 from falling. Then, the movement of the cylinder 151 of the orifice platform 1 is controlled, and the cylinder 151 drives the fixed bracket 153 to press the channel steel tightly into the clamping recess 23 to ensure the verticality of the joint box 2.

[0029] Among them, according to the insertion depth of the joint box 2, a plurality of intermediate boxes are arranged between the connecting joint 21 and the connecting box 22, and the joints are docked in sequence during the process of lowering the joint box 2. During the docking process, the snap-fit ​​recess 23 on the joint is engaged with the channel steel and fixed on the orifice platform 1, and then the joints are docked, and then the depth is continued to be lowered.

[0030] S6, perfusion catheter installation; Pass the grouting conduit through the grouting hole 12, and extend the lower end of the grouting conduit into the pile hole, maintaining a distance of 0.5m from the bottom of the pile hole. The upper end of the grouting conduit is located above the orifice platform 1, and is thus clamped and fixed by the orifice platform 1. Insert the lower end of the hopper into the upper end of the grouting conduit, and pour concrete into the pile hole through the hopper and the grouting conduit. The height of the orifice platform 1 from which the grouting conduit extends is not less than 0.8m, ensuring that the hopper does not touch the top of the joint box 2 during the grouting process.

[0031] S7, pouring concrete for piles; Before pouring the pile concrete, the thickness of the sediment at the bottom of the pile hole needs to be measured. If it exceeds the standard, air lift reverse circulation is used to clean the hole. When the pile concrete is initially poured, ensure that the pouring pipe is buried in the concrete to a depth of not less than 0.8m. During the pouring process, maintain continuous pouring and always control the depth of the pouring pipe in the concrete at 2m to 4m. The over-pouring height of the pile top is not less than 50cm. When the pile top is close to the ground, ensure that the concrete on the pile top is fully slurried.

[0032] S8, remove the connector box 2; After the pile concrete is poured, about 4 to 5 hours after the pile concrete is poured, use a crane to slightly lift the joint box 2 to loosen the contact between the joint box 2 and the concrete to prevent it from sticking too tightly to the concrete. At the same time, use a hammer to hit the steel vibrating rod 24 on the top of the joint box 2. According to the characteristics of sound wave frequency attenuation caused by the change of elastic modulus during concrete hardening process: Before initial setting: concrete is in a fluid state, and the vibration rod sound wave frequency is >1800Hz (high-frequency crisp sound); Initial setting critical point: elastic modulus jumps, frequency drops sharply to 800-1000Hz (low-frequency muffled sound); Fully hardened: frequency is stable below 600Hz.

[0033] Use a 1000Hz tuning fork to make the judgment. When the 1000Hz tuning fork resonates, remove the joint box 2. When the 1000Hz tuning fork does not resonate, tap it every half an hour. During the tapping process, use a hanging ping-pong ball to stick to the 1000Hz tuning fork to detect whether the tuning fork resonates. During the removal of the joint box 2, a dedicated person is assigned to flush the concrete on the joint box 2 to prevent the concrete from solidifying on the surface of the joint box 2 and affecting the next smooth insertion.

[0034] S9, pile construction; 12 hours after the adjacent piles are poured, a rotary drilling rig and a drill bucket are used to drill the soil in the pile holes, keeping the center of the drill bit aligned with the center of the pile hole; during the drilling process, the piles cast on both sides provide guidance and wall protection for drilling; the steel cage of the pile is hoisted into the pile hole, and a dedicated person is assigned to direct the lifting operation. Keep it stable during lifting and keep it vertical when entering the hole. It is strictly forbidden to touch the piles on both sides; after all the steel cages are installed in the pile holes, check the installation position, and after confirming that it meets the requirements, fix the steel cage lifting bars, and after the cage top elevation is verified, place the pouring conduit, and then check the thickness of the sediment at the bottom of the pile hole. If it exceeds the design requirements, perform a second hole cleaning, and then pour the pile concrete.

[0035] The present invention adopts the joint box body 2 to fill the bite space of the plain pile. When drilling the concrete pile hole later, there is no need to cut the concrete of the plain pile. In addition, the plain pile can serve as a guide and wall protection for drilling the concrete pile hole, preventing the hole from being skewed due to uneven force during cutting caused by the difference in concrete strength on both sides, ensuring the verticality and bite effect of the pile body, and the pile quality of the support system is good.

[0036] The interlocking space of the plain pile of the present invention is filled with the joint box 2, and there is no need to pour concrete, which reduces material costs and reduces the reduced work efficiency and waste slag transportation caused by cutting this part of the concrete. At the same time, the hole platform 1 and the joint box 2 can be reused, the overall construction cost is greatly reduced, and the construction efficiency is significantly improved.

[0037] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A construction method for soft-engaging and cutting-free pile formation of a prefabricated box of an occlusal pile, characterized in that: The construction method is based on a joint box and an orifice platform matched with the joint box, and includes: S1. Construction preparation; S2, guide wall construction; S3, rotary digging into holes; S4, installation of orifice platform; S5. Installation of connector box; S6, perfusion catheter installation; S7, pouring concrete for piles; S8, remove the connector box; S9, construction of meat piles.

2. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 1 is characterized in that: S1 includes: Remove surface debris, fill and compact the ground, and place steel plates for the rotary drilling rig to bear the weight. Based on the coordinates of the pile centerline, use a total station to conduct on-site layout based on the ground wire control points, and prepare pile guards to serve as the control center line for guide wall construction.

3. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 1 is characterized in that: In S2, after the guide wall excavation is completed, the center line is introduced into the trench to facilitate the alignment of the bottom formwork and the formwork to ensure that the center line of the guide wall is accurate. The steel bars are tied and the guide wall steel bars are arranged in a double layer and in two directions. Customized steel formwork is used to support and fix the formwork and then poured with concrete.

4. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 1 is characterized in that: In S4, the orifice platform includes: The bottom plate has a perfusion hole in the center, and a perfusion valve is symmetrically hinged on the bottom to guide and position the perfusion catheter extending into the perfusion hole. Two slot holes matching the joint box are provided on the bottom. Adjustment devices are provided on both sides of the bottom plate. The adjustment device includes a cylinder. The output end of the cylinder is fixedly connected to an L-shaped support plate, and two fixed brackets are fixedly connected to the L-shaped support plate. A snap-fit ​​recess is provided on the joint box, and a channel steel is provided between the snap-fit ​​recess and the fixed bracket. The movement of the fixed bracket is controlled by the cylinder, so that the channel steel is snapped and tightly fixed to the joint box. The bottom of the cylinder is fixedly connected to a fixed plate for supporting the cylinder, and the fixed plate is fixedly connected to the bottom plate.

5. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 4 is characterized in that: The hole mouth platform is installed by using GPS to verify the center position of the pile hole and the cross line, and the center point of the pile hole is drawn out to determine the center position of the hole mouth platform. The hole mouth platform is lowered to the top of the pile hole by a crane, and the hole mouth platform is manually positioned so that the center position of the hole mouth platform coincides with the center position of the pile hole, and the central axis of the hole mouth platform coincides with the center line of the interlocking pile. The level of the hole mouth platform is checked with a spirit level, and pads are used for adjustment to ensure that the opening platform is centered and placed horizontally.

6. The method for constructing occlusal pile prefabricated boxes with soft occlusal cutting-free piles according to claim 5, characterized in that: In S5, the joint box includes a connecting joint and a connecting box. The shapes of the connecting joint and the connecting box match the shape of the slot hole. The bottom of the connecting joint is fixedly connected to a joint section. The top of the connecting box is fixedly connected to a positioning frame. The positioning frame matches the joint section. Two symmetrical support rollers are provided at the bottom of the connecting joint. Two semicircular tracks are provided at the top of the connecting box. The semicircular tracks are used for movement of the support rollers. A landing hole is provided between the two semicircular tracks. The landing hole is used to accommodate the support rollers. Guide baffles are provided on the edges of the semicircular tracks for guiding and limiting the support rollers. A steel vibration rod is fixedly connected to the top of the connecting joint. The support roller of the connecting joint is in contact with the semicircular track, and the connecting joint is rotated to make the support roller enter the positioning hole, thereby connecting the positioning frame and the joint section. After fixing the positioning frame and the joint section, the installation of the joint box is completed; It also includes an intermediate box body, which is located between the connecting joint and the connecting box body. The top of the intermediate box body has the same structure as the top of the connecting box body, and the bottom of the intermediate box body has the same structure as the bottom of the connecting joint. The connecting joint, the connecting box body and the side of the intermediate box body are all provided with snap-in recesses.

7. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 6 is characterized in that: The joint box is lifted by a crane and passed through the slot hole, and then inserted downward into the pile hole. When the lower end of the joint box abuts the bottom of the pile hole, the upper end of the joint box extends to the top of the hole mouth platform to form an upper extension section. The upper extension section is fixedly connected to the hole mouth platform to keep the position of the joint box fixed.

8. The method for constructing occlusal pile prefabricated boxes with soft occlusal cutting-free piles according to claim 7, characterized in that: When the lower end of the joint box abuts against the bottom of the pile hole, the clamping recess of the connecting joint is clamped on the hole platform through the channel steel to prevent the joint box from falling. Then the movement of the cylinder of the hole platform is controlled, and the cylinder drives the fixed bracket to press the channel steel into the clamping recess to ensure the verticality of the joint box.

9. The method for constructing a prefabricated box-shaped occlusal pile without cutting according to claim 1 is characterized in that: In S6, the grouting conduit is passed through the grouting hole, the lower end of the grouting conduit extends into the pile hole, and a distance of 0.5 m is maintained from the bottom of the pile hole. The upper end of the grouting conduit is located above the orifice platform, thereby being clamped and fixed by the orifice platform. The lower end of the hopper is inserted into the upper end of the grouting conduit, and concrete is poured into the pile hole through the hopper and the grouting conduit. The height of the orifice platform where the grouting conduit extends is not less than 0.8 m. In S7, before pouring the pile concrete, the sediment thickness at the bottom of the pile hole needs to be measured. If it exceeds the standard, the hole is cleaned by air lift reverse circulation; When pouring the concrete of the plain pile for the first time, ensure that the grouting tube is buried in the concrete to a depth of not less than 0.8m. During the grouting process, maintain continuous grouting and always control the depth of the grouting tube in the concrete between 2m and 4m. The over-grouting height of the pile top should be not less than 50cm. When the pile top is close to the ground, ensure that the concrete on the pile top is fully slurried.

10. The method for constructing occlusal pile prefabricated boxes with soft occlusal cutting-free piles according to claim 5, characterized in that: In S8, after the pile concrete is poured, a hammer is used to strike the steel vibrating rod on the top of the joint box, and a 1000 Hz tuning fork is used for judgment. When the 1000 Hz tuning fork resonates, the joint box is removed.

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