Pile transfer construction method for cross construction with high subway construction road

Abstract

The invention belongs to the technical field of pile transfer construction, and particularly relates to a pile transfer construction method for cross construction with a high subway construction shortcut, which comprises the following steps: step 1, establishing a model; 2, on-site paying-off is carried out; step 3, assembling an over-poured concrete modular recycling device; fourthly, a steel bar connecting sleeve protection device and a foundation pile top concrete pre-cutting construction system are installed; fifthly, concrete is poured below the foundation pile body reinforcing steel bars; sixthly, the concrete of the over-poured part of the foundation pile serves as a cushion layer of the high subway construction shortcut; seventhly, pre-cutting construction is conducted on the pile head of the foundation pile; 8, chiseling away the construction road and the pile top concrete of the foundation pile; and ninthly, the foundation piles and the conversion structure column steel bars are connected. The pile transfer construction method for cross construction with the high subway construction road has the beneficial effects that the influence of the foundation pile on the high subway construction road on the horizontal transportation of the high subway is avoided, and the construction quality of the building foundation pile perpendicular to the high subway construction road is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pile-column transfer construction, and in particular relates to a pile-column transfer construction method for cross-construction with a high-speed subway construction access road. Background Art

[0002] At present, the newly built high-speed rail lines in the country are becoming more and more mature, and the newly built high-speed rail lines are constantly integrated with urban construction. A large number of high-speed rail covers and subway covers have appeared. The situation of synchronous construction of high-speed rail, subway and ground buildings is increasing. In order to reduce the impact on urban residents and urban planning, most high-speed rail lines passing through urban areas adopt the form of underground tunnels. In order to reduce the impact of high-speed rail on buildings, pile foundations need to be set up for ground buildings. During the construction of high-speed rail, the engineering piles of ground buildings and the construction access roads around the high-speed rail structure intersect. Therefore, if the foundation piles protrude from the high-speed rail transportation access road, it will affect the horizontal material transportation of the high-speed rail construction road. If the pile foundation is constructed twice, the foundation pile will be faulted, the pile body steel bars are difficult to connect, the steel bar connection quality is poor, and the foundation pile cannot be grouted before the second connection, which affects the quality of pile foundation construction. In addition, the over-grouting part of the pile foundation wastes concrete, and the second connection joint of the pile body is uneven, which brings a series of problems to the quality control of pile foundation construction and the horizontal transportation of high-speed rail construction. Therefore, a pile column transfer construction method that intersects with the high-speed subway construction access road is particularly important. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to provide a method for transferring piles and columns for cross-construction with a high-speed subway construction access road.

[0004] The present invention relates to a method for transferring piles and columns for cross-construction with a high-speed subway construction access road, comprising the following steps: Step 1: Establish the pile construction model, the intersection construction model of the pile and the high-speed subway access road, and the overall structure construction model of the pile and the structural column; Step 2: On-site line laying; Step 3: Assembling the modular recycling device of overfilled concrete; Step 4: Install the steel bar connection sleeve protection device 4 and install the foundation pile top concrete pre-cutting construction system; Step 5: pour concrete under the reinforcement of the pile body; Step 6: Modularly recycle part of the concrete overfilled in the foundation piles to pave the cushion layer of the high-speed subway construction access road; Step 7: Pre-cutting construction of foundation pile head; Step 8: Chisel out the construction access road and break up the concrete on top of the foundation piles; Step 9: Connect the foundation pile reinforcement with the conversion structure column reinforcement.

[0005] Preferably, in step one, a construction model integrating the position of the foundation pile structure and the high-speed subway construction access road as a whole should be established first, a comprehensive geological topographic model should be drawn according to the survey of the geological survey points, and a model of the foundation pile elevation, the foundation pile elevation, the high-speed subway access road elevation and the steel bar connection mode of the foundation pile and the transfer structure column should be established in combination with the pile foundation design drawings. The model should be simulated for construction, and whether the construction plan of the foundation pile and the transfer structure column is feasible should be tested to adjust and optimize the construction steps.

[0006] Preferably, in the step 2, a control network should be established first. According to the plane reference points provided by the owner, multiple measuring stations should be established by a total station, and then horizontal control lines should be placed. The horizontal control lines are mainly based on the main structure. The elevation lines are marked on the outer facades by a level. According to the keel positioning diagram, the steel columns are positioned in combination with the plane control network and the horizontal control lines, and the anchor bolt implantation positions are marked.

[0007] Preferably, in step three, the modular recycling device for overcast concrete is assembled in the back-end processing area according to the model and the processing drawing; the modular recycling device for overcast concrete includes a plurality of pallets, a plurality of nut fixing bases and a plurality of pallet connectors; the pallet is made of 3mm steel plate, the height of each level of the pallet is 100mm, and the inner surface is painted with an oily release agent before assembly, and an oily anti-adhesion treatment is performed on it. The cross-sectional size of the pallet is determined according to the diameter of the foundation pile, and the bottom and top of the side of the pallet are fixedly connected to the nut fixing base respectively, and the nut fixing base at the bottom of the upper pallet and the nut fixing base at the top of the lower pallet are fixedly connected through the pallet connector, and the upper and lower pallets are fixedly connected; The width, length, verticality and fixation of the multi-stage connection of the modular recycling device for overcast concrete after assembly are measured with a steel tape measure to determine whether it is consistent with the processing Figure 1 If the error is too large, rework and adjustment are required; the pallet 1 is classified and stacked according to its diameter, and the modular recycling devices of over-cast concrete corresponding to different pile diameters are stacked separately and transported to the construction site before installation.

[0008] Preferably, in step 4, the steel bar connection sleeve protective device includes a sleeve connecting shaft, a conversion shaft, a protection device connecting shaft, a protection device rotating shaft, a protection device connecting rod, a protection device fixed cross bar and a sleeve protective rubber sleeve; when the steel bar connection sleeve protective device is installed, after the pile body steel cage is processed, the top of the pile body main reinforcement is threaded, the length of the thread head is consistent with the length of the steel bar connection sleeve protective device, and the steel bar connection sleeve protective device is screwed into the processed steel bar thread head. During the screwing-in process, the sleeve connecting shaft built into the steel bar connection sleeve protective device rotates, driving the conversion shaft to rotate, and driving the protection device connecting shaft to rotate. The protection device rotating shaft rotates from bottom to top along with the protection device connecting shaft, and finally drives the protection device The protective device connecting rod is rotated to the top of the steel bar connection sleeve protective device, the protective device connecting rods on both sides of the steel bar connection sleeve protective device are connected to the protective device fixing cross bar, the sleeve protective rubber sleeve is wound and fixed on the protective device fixing cross bar, after the steel bar connection sleeve protective device is screwed into the steel bar wire head, the sleeve protective rubber sleeve is pulled out and sleeved on the main reinforcement of the pile body, and the protective length of the sleeve protective rubber sleeve is not less than 200mm; after the steel bar connection sleeve protective device is installed, the surface is wrapped with pearl foam cotton for protection, and the top and bottom of the pearl foam cotton are tied with cable ties, and then the PVC protective sleeve is sleeved on the outside of the pearl foam cotton, and the top and bottom of the PVC protective sleeve are wrapped as a whole with plastic film and sealed with tape; When the construction system for pre-cutting concrete on the top of the foundation pile is installed, a grouting expansion bag is fixedly connected to the pile body reinforcement cage according to the position of the secondary cutoff of the pile top on the construction model, and a concrete pouring pipe interface is opened on the grouting expansion bag. A 10mm steel plate is fixed on the upper part of the grouting expansion bag, and the steel plate is temporarily fixed to the main reinforcement of the pile body by binding, and the steel plate extends out of the pile body by 150mm on each side.

[0009] Preferably, in the step 5, when the steel cage is hoisted into the hole, when the weight of the steel cage is less than or equal to 3.0 tons, within the height range from the top of the steel cage to the natural elevation of the site, 2φ14 hanging bars are used to fix the steel cage in place, and one end of the hanging bar is bent into a closed shape with an inner diameter of about 200 mm. When the weight of the steel cage is less than 3.0 tons, within the height range from the top of the steel cage to the natural elevation of the site, 2φ16 hanging bars are used to fix the steel cage in place, and one end of the hanging bar is bent into a circle with a diameter of about 200 mm. The design strength grade of concrete is C40 underwater concrete, the slump of concrete is controlled at 180-220mm, commercial concrete is selected, and the commercial concrete is poured using a 260mm diameter conduit underwater pouring method. The construction sequence is: place the steel cage - install the conduit - make the water stop close to the water surface in the conduit - pour the first batch of commercial concrete - pour continuously until the top of the pile - pull out the casing.

[0010] Preferably, in step six, a cutting line is set at the required pile top position along the circumference of the modular regeneration device for over-cast concrete, and the strip area 40 cm above the cutting line is the key construction area. A cutting machine is used to cut along the cutting line. The cutting depth depends on the thickness of the steel bar protective layer. The cutting depth is less than the thickness of the steel bar protective layer, and the pile foundation steel bars, acoustic detection tubes and grouting tubes cannot be cut; the pneumatic pick and drill top are cut, the drill bit is horizontal or slightly upward, and the over-cast concrete is demolded and separated in sections and layers; after a sand and gravel cushion layer is used on the pile top, the modular concrete is paved under the access road as a access road cushion layer.

[0011] Preferably, in the step seven, the construction of pre-cutting the pile head starts after the final setting of the pile concrete and is carried out within 2 days of pile formation. Clean water is injected into the grouting expansion bag through a 30 mm diameter seamless steel pipe. When the strength of the pile body concrete has not increased significantly, the pile head is pre-cut through the grouting expansion bag to pre-separate the pile head. When the distance between the grouting operation and the drilling operation point is not less than 10 m, the grouting pressure is controlled at 2.5-4 MPa, and then the grouting pressure is increased, but not higher than 5.0 MPa. After the grouting is completed, the high-speed subway walkway surface layer concrete is poured on the walkway cushion layer and used as the high-speed subway construction walkway.

[0012] Preferably, in step eight, a pneumatic pick is used to break the pile to the designed elevation of the pile top, and then a hand-held electric hammer is used for fine chiseling and trimming. The incompletely cut position of the partial foundation pile head is quickly separated by the extended steel plate, and a jack is supported at the bottom of the extended steel plate, and the pile head is quickly separated by the jack; the allowable deviation of the top surface after the pile head is broken is ±20mm; after the pile head steel bars are adjusted to the designed elevation according to the drawing requirements, the pile head broken aggregate and soil impurities are cleaned up.

[0013] Preferably, in step nine, the steel bar connection sleeve protection device is deployed to extend the steel bars of the foundation pile body and connect the steel bars of the upper conversion structure column.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are: Compared with the prior art, the present invention and the pile transfer construction method for the cross-construction of the high-speed subway construction access road are used. (1) The pile transfer construction method for cross-construction with the subway construction access road avoids the impact of the foundation piles on the subway access road on the horizontal transportation of the subway, solves the problems of overdue grouting of the foundation piles caused by the need for secondary pile connection, the inability to grout due to soil disturbance caused by the use of the access road, and the easy damage of the foundation piles by vehicles passing through the access road, thereby improving the construction quality of the foundation piles of the building perpendicular to the subway construction access road; (2) Using the modular recycling device of over-cast concrete, the over-cast concrete can be separated into layers and recycled as the cushion layer of the high-speed subway walkway, thus reducing the waste of concrete material resources; (3) The steel bar connection sleeve protection device integrates the steel bar sleeve installation with the steel bar protection measures, solving the problem that the steel bars in the foundation pile cannot be connected to the upper structure steel bars using the sleeve after the pile head is broken, reducing the material waste caused by steel bar overlap, and avoiding the problem of low efficiency of steel bar welding connection; (4) The construction system of pre-cutting concrete on the top of the piles improves the construction efficiency of the pile conversion structural columns, ensures the quality of the pile reinforcement joints, reduces construction costs, speeds up project progress, and improves project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for describing the embodiment. Figure 1 A flowchart of a pile transfer construction method for cross-construction with a high-speed subway construction access road provided in Example 1; Figure 2 A cross-sectional view of the modular recycling device for overcast concrete provided in Example 1; Figure 3 Provided for Example 1 Figure 2 A magnified image of point A; Figure 4 Provided for Example 1 Figure 2 The enlarged view of point B; Figure 5 A cross-sectional view of the steel bar connection sleeve protection device provided in Example 1; Figure 6 Provided for Example 1 Figure 5 Enlarged view of point C; Figure 7 This is a cross-sectional view of the pre-cut construction system of the foundation pile top concrete provided in Example 1.

[0016] Description of reference numerals: 1—support plate, 2—nut fixing base, 3—support plate connector, 4—rebar connecting sleeve protection device, 5—pearl foam cotton, 6—PVC protection sleeve, 7—sleeve connecting shaft, 8—conversion shaft, 9—protection device connecting shaft, 10—protection device rotating shaft, 11—protection device connecting rod, 12—protection device fixing cross bar, 13—sleeve protection rubber sleeve, 14—steel plate, 15—grouting expansion bag, 16—concrete pouring pipe interface, 17—seamless steel pipe. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0019] Example 1 like Figure 1 The pile transfer construction method for intersecting construction with a high-speed subway construction access road shown in the figure comprises the following steps: Step 1: Establish the foundation pile construction model, the intersection construction model of the foundation pile and high-speed subway access road, and the overall structural construction model of the foundation pile and structural column.

[0020] Step 2: Laying out the lines on site.

[0021] Step 3: Assemble the modular recycling device of overcast concrete.

[0022] Step 4: Install the steel bar connection sleeve protection device 4 and install the foundation pile top concrete pre-cutting construction system.

[0023] Step 5: Pour concrete under the reinforcement of the pile body.

[0024] Step 6: Part of the concrete overfilled in the foundation piles is recycled in a modular way and used to pave the cushion layer of the high-speed subway construction access road.

[0025] Step 7: Pre-cutting of foundation pile heads.

[0026] Step 8: Chisel out the construction access road and break up the concrete on top of the foundation piles.

[0027] Step 9: Connect the foundation pile reinforcement with the conversion structure column reinforcement.

[0028] In step one, we should first establish a construction model that integrates the location of the foundation pile structure and the high-speed subway construction access road as a whole. Draw a comprehensive geological topographic model based on the survey of geological survey points. Combined with the pile foundation design drawings, we should establish a model of the foundation pile elevation, foundation pile elevation, high-speed subway access road elevation, and the steel connection method between the foundation pile and the transfer structure column. We should simulate the construction of the model, check whether the construction plan of the foundation pile and the transfer structure column is feasible, and adjust and optimize the construction steps.

[0029] In step two, a control network should be established first. Based on the plane reference points provided by the owner, multiple measuring stations should be established through the total station, and then horizontal control lines should be placed. The horizontal control lines are mainly based on the main structure. The elevation lines are marked on the outer facades with a level. According to the keel positioning diagram, the steel columns are positioned in combination with the plane control network and the horizontal control lines, and the anchor bolt implantation positions are marked.

[0030] like Figure 2-Figure 3As shown, in step three, according to the model and processing drawings, the modular recycling device of over-cast concrete is assembled in the back-end processing area; the modular recycling device of over-cast concrete includes multiple pallets 1, multiple nut fixing bases 2 and multiple pallet connectors 3; the pallet 1 is made of 3mm steel plate, and the height of each level of the pallet is 100mm. Before assembly, the inner surface is painted with an oily release agent and subjected to an oily anti-adhesion treatment. The cross-sectional size of the pallet 1 is determined according to the diameter of the foundation pile, and the bottom and top of the side of the pallet 1 are fixedly connected to the nut fixing base 2 respectively, and the nut fixing base 2 at the bottom of the upper pallet 1 and the nut fixing base 2 at the top of the lower pallet 1 are fixedly connected through the pallet connector 3, and the upper and lower pallets 1 are fixedly connected.

[0031] Use a steel tape measure to measure the width, length, verticality and fixation of the multi-stage connection of the assembled overcast concrete modular recycling device to determine whether it is consistent with the processing Figure 1 If the error is too large, rework and adjustment are required; the piles are classified and stacked according to the diameter of the pallet 1, and the modular recycling devices of over-cast concrete corresponding to different pile diameters are stacked separately and transported to the construction site before installation.

[0032] like Figure 4-Figure 6 As shown, in step 4, the steel bar connection sleeve protective device 4 includes a sleeve connecting shaft 7, a conversion shaft 8, a protective device connecting shaft 9, a protective device rotating shaft 10, a protective device connecting rod 11, a protective device fixed cross bar 12 and a sleeve protective rubber sleeve 13; when the steel bar connection sleeve protective device 4 is installed, after the pile body steel cage is processed, the top of the pile body main reinforcement is threaded, the length of the thread head is consistent with the length of the steel bar connection sleeve protective device 4, and the steel bar connection sleeve protective device 4 is screwed into the processed steel bar thread head. During the screwing process, the sleeve connecting shaft 7 built into the steel bar connection sleeve protective device 4 rotates, driving the conversion shaft 8 to rotate, and driving the protective device connecting shaft 9 to rotate. The protective device rotating shaft 10 rotates from bottom to top with the protective device connecting shaft 9, and finally drives the protective device to rotate. The protective device connecting rod 11 is rotated to the top of the steel bar connection sleeve protective device 4, and the protective device connecting rods 11 on both sides of the steel bar connection sleeve protective device 4 are connected to the protective device fixing cross bar 12, and the sleeve protection rubber sleeve 13 is wrapped and fixed on the protective device fixing cross bar 12. After the steel bar connection sleeve protective device 4 is screwed into the steel bar wire head, the sleeve protection rubber sleeve 13 is pulled out and sleeved on the main reinforcement of the pile body. The protection length of the sleeve protection rubber sleeve 13 is not less than 200mm; after the steel bar connection sleeve protective device 4 is installed, the surface is wrapped with pearl foam cotton 5 for protection, and the top and bottom of the pearl foam cotton 5 are fastened with cable ties, and then the PVC protective sleeve 6 is sleeved on the outside of the pearl foam cotton 5, and the top and bottom of the PVC protective sleeve 6 are wrapped as a whole with plastic film and sealed with tape.

[0033] like Figure 7As shown, when the construction system for pre-cutting concrete on the top of the foundation pile is installed, a grouting expansion bag 15 is fixedly connected to the pile body reinforcement cage according to the position of the secondary cut on the pile top on the construction model, and a concrete pouring pipe interface 16 is opened on the grouting expansion bag 15. A 10 mm steel plate 14 is fixed on the upper part of the grouting expansion bag 15, and the steel plate 14 is temporarily fixed to the main reinforcement of the pile body by binding, and each side of the steel plate 14 extends 150 mm out of the pile body.

[0034] In step five, when hanging the steel cage into the hole, if the weight of the steel cage is less than or equal to 3.0 tons, 2φ14 hanging rods are used to fix the steel cage in place within the height range from the top of the steel cage to the natural elevation of the site, and one end of the hanging rod is bent into a closed shape with an inner diameter of about 200mm. When the weight of the steel cage is less than 3.0 tons, 2φ16 hanging rods are used to fix the steel cage in place within the height range from the top of the steel cage to the natural elevation of the site, and one end of the hanging rod is bent into a circle with a diameter of about 200mm.

[0035] The design strength grade of concrete is C40 underwater concrete, the slump of concrete is controlled at 180-220mm, commercial concrete is selected, and the commercial concrete is poured using a 260mm diameter conduit underwater pouring method. The construction sequence is: place the steel cage - install the conduit - make the water stop close to the water surface in the conduit - pour the first batch of commercial concrete - pour continuously until the top of the pile - pull out the casing.

[0036] In step six, a cutting line is set along the circumference of the modular regeneration device for over-cast concrete at the required pile top position. The strip area 40 cm above the cutting line is the key construction area. A cutting machine is used to cut along the cutting line. The cutting depth depends on the thickness of the steel bar protective layer. The cutting depth is less than the thickness of the steel bar protective layer and the pile foundation steel bars, acoustic detection pipes and grouting pipes cannot be cut. The pneumatic pick and drill top are broken. The drill bit is horizontal or slightly upward, and the over-cast concrete is demoulded and separated in sections and layers. After a sand and gravel cushion layer is used on the pile top, the modular concrete is paved under the access road as a access road cushion layer.

[0037] like Figure 7 As shown, in step seven, the pre-cutting construction of the pile head starts after the final setting of the pile concrete and is carried out within 2 days of pile formation. Clean water is injected into the grouting expansion bag 15 through a 30mm diameter seamless steel pipe 17. When the strength of the pile body concrete has not increased significantly, the pile head is pre-cut through the grouting expansion bag 15 to pre-separate the pile head. When the distance between the grouting operation and the drilling operation point is not less than 10m, the grouting pressure is controlled at 2.5-4Mpa, and then the grouting pressure is increased, but not higher than 5.0Mpa. After the grouting is completed, the high-speed subway walkway surface layer concrete is poured on the walkway cushion layer and used as the high-speed subway construction walkway.

[0038] In step eight, a pneumatic pick is used to break down to the designed elevation of the pile top, and then a handheld electric hammer is used for fine chiseling and trimming. The partially cut-off position of the pile head is quickly separated by the extended steel plate 14, and a jack is set at the bottom of the extended steel plate 14 to quickly separate the pile head. The allowable deviation of the top surface after the pile head is broken is ±20mm. After the pile head steel bars are adjusted to the designed elevation according to the drawing requirements, the pile head broken aggregate and soil impurities are cleaned up.

[0039] In step nine, the steel bar connection sleeve protection device 4 is unfolded, the steel bars of the foundation pile body are extended, and the steel bars of the upper conversion structure column are connected.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for connecting piles with a high-speed subway construction access road, characterized in that: The following steps are involved: Step 1: Establish the pile construction model, the intersection construction model of the pile and the high-speed subway access road, and the overall structure construction model of the pile and the structural column; Step 2: On-site line laying; Step 3: Assembling the modular recycling device of overfilled concrete; Step 4: Install the steel bar connection sleeve protection device (4) and install the foundation pile top concrete pre-cutting construction system; Step 5: pour concrete under the reinforcement of the pile body; Step 6: Modularly recycle part of the concrete overfilled in the foundation piles to pave the cushion layer of the high-speed subway construction access road; Step 7: Pre-cutting construction of foundation pile head; Step 8: Chisel out the construction access road and break up the concrete on top of the foundation piles; Step 9: Connect the foundation pile reinforcement with the transfer structure column reinforcement.

2. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 1 is characterized in that: In the step one, a construction model for the overall integration of the foundation pile structure position and the high-speed subway construction access road is first established, a comprehensive geological topographic model is drawn according to the survey of geological survey points, and a model for the foundation pile elevation, foundation pile elevation, high-speed subway access road elevation, and the steel bar connection method of the foundation pile and the conversion structure column is established in combination with the pile foundation design drawings. The model is simulated for construction, and whether the construction plan of the foundation pile and the conversion structure column is feasible is tested, and the construction steps are adjusted and optimized.

3. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 2 is characterized in that: In the step 2, a control network is first established. According to the plane reference points provided by the owner, multiple measuring stations are established by a total station, and then horizontal control lines are placed. The horizontal control lines are mainly based on the main structure. The elevation lines are marked on the outer facades by a level. According to the keel positioning diagram, the steel columns are positioned in combination with the plane control network and the horizontal control lines, and the anchor bolt implantation positions are marked.

4. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 3 is characterized in that: In the step 3, the modular recycling device for overcast concrete is assembled in the back-end processing area according to the model and the processing diagram; the modular recycling device for overcast concrete comprises a plurality of pallets (1), a plurality of nut fixing bases (2) and a plurality of pallet connectors (3); the pallet (1) is made of a 3 mm steel plate, the height of each level of the pallet is 100 mm, the inner surface is painted with an oily release agent before assembly, and an oily anti-adhesion treatment is performed on it, the cross-sectional size of the pallet (1) is determined according to the diameter of the foundation pile, and the bottom and top of the side of the pallet (1) are fixedly connected to the nut fixing base (2) respectively, the nut fixing base (2) at the bottom of the upper pallet (1) and the nut fixing base (2) at the top of the lower pallet (1) are fixedly connected through the pallet connector (3), and the upper and lower pallets (1) are fixedly connected; The width, length, verticality of the multi-stage connection and the fixing condition of the multi-stage connection of the assembled modular recycling device of overcast concrete are measured with a steel tape measure to determine whether they are consistent with the processing drawing. If the error is too large, rework and adjustment are required; the modular recycling devices of overcast concrete corresponding to different pile diameters are stacked separately according to the diameter of the pallet (1) and transported to the construction site before installation.

5. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 4 is characterized in that: In the fourth step, the steel bar connection sleeve protective device (4) comprises a sleeve connection shaft (7), a conversion shaft (8), a protection device connection shaft (9), a protection device rotating shaft (10), a protection device connection rod (11), a protection device fixed cross bar (12) and a sleeve protective rubber sleeve (13); when the steel bar connection sleeve protective device (4) is installed, after the pile body steel bar cage is processed, the top of the pile body main bar is threaded, the thread head length is consistent with the length of the steel bar connection sleeve protective device (4), and the steel bar connection sleeve protective device (4) is screwed into the processed steel bar thread head. During the screwing process, the sleeve connection shaft (7) built into the steel bar connection sleeve protective device (4) rotates, driving the conversion shaft (8) to rotate, and driving the protection device connection shaft (9) to rotate, and the protection device rotating shaft (10) rotates from bottom to top along with the protection device connection shaft (9), finally driving the protection device The connecting rod (11) is rotated to the top of the steel bar connection sleeve protection device (4), the protection device connecting rods (11) on both sides of the steel bar connection sleeve protection device (4) are connected to the protection device fixing cross bar (12), the sleeve protection rubber sleeve (13) is wound and fixed on the protection device fixing cross bar (12), after the steel bar connection sleeve protection device (4) is screwed into the steel bar thread head, the sleeve protection rubber sleeve (13) is pulled out and sleeved on the main reinforcement of the pile body, and the protection length of the sleeve protection rubber sleeve (13) is not less than 200mm; after the steel bar connection sleeve protection device (4) is installed, the surface is wrapped with pearl foam cotton (5) for protection, and the top and bottom of the pearl foam cotton (5) are tied with a cable tie, and then a PVC protection sleeve (6) is sleeved on the outside of the pearl foam cotton (5), and the top and bottom of the PVC protection sleeve (6) are wrapped with a plastic film as a whole and sealed with tape; When the foundation pile top concrete pre-cut construction system is installed, a grouting expansion bag (15) is fixedly connected to the pile body reinforcement cage according to the position of the pile top secondary cut on the construction model, and a concrete pouring pipe interface (16) is opened on the grouting expansion bag (15). A 10 mm steel plate (14) is fixed on the upper part of the grouting expansion bag (15), and the steel plate (14) is temporarily fixed to the main reinforcement of the pile body by binding, and each side of the steel plate (14) extends out of the pile body by 150 mm.

6. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 5, characterized in that: In the step 5, when the steel cage is hoisted into the hole, if the weight of the steel cage is less than or equal to 3.0 tons, within the height range from the top of the steel cage to the natural elevation of the site, 2φ14 hanging bars are used to fix the steel cage in place, and one end of the hanging bar is bent into a closed shape with an inner diameter of about 200 mm. When the weight of the steel cage is less than 3.0 tons, within the height range from the top of the steel cage to the natural elevation of the site, 2φ16 hanging bars are used to fix the steel cage in place, and one end of the hanging bar is bent into a circle with a diameter of about 200 mm. The design strength grade of concrete is C40 underwater concrete, the slump of concrete is controlled at 180-220mm, commercial concrete is selected, and the commercial concrete is poured using a 260mm diameter conduit underwater pouring method. The construction sequence is: place the steel cage - install the conduit - make the water stop close to the water surface in the conduit - pour the first batch of commercial concrete - pour continuously until the top of the pile - pull out the casing.

7. The method for connecting piles and columns for crossing with a high-speed subway construction access road according to claim 6 is characterized in that: In the step six, a cutting line is set along the circumference of the modular regeneration device for over-cast concrete at the required pile top position, and the strip area 40 cm above the cutting line is the key construction area. A cutting machine is used to cut along the cutting line. The cutting depth depends on the thickness of the steel bar protective layer. The cutting depth is less than the thickness of the steel bar protective layer, and the pile foundation steel bars, acoustic detection pipes and grouting pipes cannot be cut; the pneumatic pick and drill top are cut, the drill bit is horizontal or slightly upward, and the over-cast concrete is demolded and separated in sections and layers; after a sand and gravel cushion layer is used on the pile top, the modular concrete is paved under the access road as a access road cushion layer.

8. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 7 is characterized in that: In the step seven, the pre-cutting of the pile head begins after the final setting of the pile concrete and is carried out within 2 days of the pile formation. Clean water is injected into the grouting expansion bag (15) through a 30 mm diameter seamless steel pipe (17). When the strength of the pile body concrete has not increased significantly, the pile head is pre-cut through the grouting expansion bag (15) to pre-separate the pile head. When the distance between the grouting operation and the drilling operation point is not less than 10 m, the grouting pressure is controlled at 2.5 to 4 MPa, and then the grouting pressure is increased but not higher than 5.0 MPa. After the grouting is completed, the high-speed subway walkway surface layer concrete is poured on the walkway cushion layer to be used as the high-speed subway construction walkway.

9. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 8, characterized in that: In the step eight, a pneumatic pick is used to break the pile to the designed elevation of the pile top, and then a handheld electric hammer is used to perform fine chiseling and trimming. The partially cut-off position of the pile head is quickly separated by using the extended steel plate (14). A jack is supported at the bottom of the extended steel plate (14), and the pile head is quickly separated by using the jack. The allowable deviation of the top surface of the pile head after breaking is ±20 mm. After the pile head steel bars are adjusted to the designed elevation according to the requirements of the drawing, the pile head is cleaned of broken aggregate and soil impurities.

10. The method for connecting piles and columns for intersecting with a high-speed subway construction access road according to claim 9, characterized in that: In the step nine, the steel bar connection sleeve protection device (4) is unfolded to extend the steel bars of the foundation pile body and connect the steel bars of the upper conversion structure column.

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