A pile transfer construction method for crossing high subway construction access road construction

Abstract

The present application belongs to the technical field of pile column switching construction, and particularly relates to a pile column switching construction method for cross construction with high subway construction access, comprising the following steps: step one, model establishment; step two, site line laying; step three, assembly of super-poured concrete modularized recycling device; step four, installation of reinforcing steel bar connecting sleeve protection device and base pile top concrete pre-cutting construction system; step five, base pile body reinforcing steel bar and concrete pouring; step six, base pile super-poured concrete as cushion of high subway construction access; step seven, base pile head pre-cutting construction; step eight, removal of construction access and base pile top concrete; and step nine, base pile and conversion structure column reinforcing steel bar connection. The pile column switching construction method for cross construction with high subway construction access avoids the influence of base pile on high subway horizontal transportation on high subway access, and improves the construction quality of the building base pile perpendicular to the high subway construction access.

Description

Technical Field

[0001] This invention belongs to the field of pile-column transfer construction technology, specifically relating to a pile-column transfer construction method for construction intersecting with a subway construction access road. Background Technology

[0002] As China's high-speed rail network matures, new lines are increasingly integrated with urban development, leading to numerous high-speed rail-above-railway and subway-above-subway building projects. The simultaneous construction of high-speed rail, subway, and above-ground buildings is becoming more common. To minimize impact on urban residents and planning, high-speed rail lines traversing city areas often utilize underground tunnels. To further reduce the impact on buildings, pile foundations are necessary. During construction, these foundation piles intersect with access roads surrounding the high-speed rail structure. If piles protrude beyond the access roads, it hinders horizontal material transport. If pile foundations are constructed in two phases, discontinuities occur, making it difficult to connect the reinforcing bars, resulting in poor connection quality. Grouting cannot be performed before the secondary connection, affecting construction quality. Over-grouting wastes concrete, and uneven joints at the secondary connection point create numerous problems for quality control and horizontal transport during high-speed rail construction. Therefore, a pile transition construction method that addresses intersections with high-speed rail / subway access roads is crucial. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a method for pile transfer construction when construction intersects with the access road for subway construction.

[0004] This invention relates to a method for the construction of pile transition in intersection with the construction of a subway access road, comprising the following steps:

[0005] Step 1: Establish the foundation pile construction model, the foundation pile and high-speed rail temporary road intersection construction model, and the foundation pile and structural column overall structure construction model;

[0006] Step 2: On-site layout;

[0007] Step 3: Assemble the modular recycling device for overfilled concrete;

[0008] Step 4: Install the rebar connection sleeve protection device and install the pre-cut concrete excavation construction system for the foundation pile top;

[0009] Step 5: Pouring concrete below the reinforcement bars of the foundation pile;

[0010] Step Six: Modularly recycled concrete from the over-poured foundation piles is used as the subbase layer for paving the temporary access road for the subway construction.

[0011] Step 7: Construction of pre-cutting of pile heads;

[0012] Step 8: Remove the construction access road and break the concrete at the top of the foundation piles;

[0013] Step 9: Connect the foundation pile reinforcement to the transfer structure column reinforcement.

[0014] Preferably, in step one, a construction model integrating the location of the foundation pile structure and the construction access road for the subway should be established first. A comprehensive geological and topographical model should be drawn based on the geological survey points. Combined with the pile foundation design drawings, a model should be established for the foundation pile elevation, foundation pile height, subway access road elevation, and the connection method of the foundation pile and the reinforcement of the transfer structure column. The model should be used to simulate construction, check whether the construction plan of the foundation pile and the transfer structure column is feasible, and adjust and optimize the construction steps.

[0015] Preferably, in step two, a control network should first be established. Based on the plane reference points provided by the owner, multiple measuring stations should be established using a total station. Then, horizontal control lines should be placed, mainly based on the main structure. Elevation lines should be marked on each of the outer facades using a level. Based on the keel positioning diagram, the steel columns should be positioned using the plane control network and the horizontal control lines, and the anchor bolt insertion positions should be marked.

[0016] Preferably, in step three, the modular recycling device for super-poured concrete is assembled in the back-end processing area according to the model and processing drawings. The modular recycling device for super-poured concrete includes multiple pallets, multiple nut fixing bases, and multiple pallet connectors. The pallets are made of 3mm steel plates, and each pallet is 100mm high. Before assembly, an oil-based release agent is applied to the inner surface to prevent sticking. The cross-sectional dimensions of the pallets are determined according to the diameter of the foundation piles. The bottom and top sides of the pallets are fixedly connected to the nut fixing bases, and the nut fixing bases at the bottom of the upper pallet and the nut fixing bases at the top of the lower pallet are fixedly connected by the pallet connectors to fix the upper and lower pallets together.

[0017] The width, length, verticality of multi-stage connections, and fixation of the assembled modular recycling device for over-pouring concrete were measured using a steel tape measure to determine whether they were compatible with the processing. Figure 1 If the error is too large, rework and adjustment are required; according to the diameter of the pallet, the modular recycling devices for over-filled concrete corresponding to different pile diameters are stacked separately and transported to the construction site before installation.

[0018] Preferably, in step four, when installing the rebar connection sleeve protection device, after the pile body rebar cage is processed, the top of the main rebar of the pile body is threaded, and the length of the thread is consistent with the length of the rebar connection sleeve protection device. The rebar connection sleeve protection device is then screwed into the processed rebar thread. After the rebar connection sleeve protection device is installed, pearl foam cotton is wrapped around its surface for protection, and the top and bottom openings of the pearl foam cotton are secured with cable ties. Then, a PVC protective sleeve is fitted over the pearl foam cotton, and the top and bottom openings of the PVC protective sleeve are completely wrapped with plastic film and sealed with tape.

[0019] During the installation of the pre-cut concrete construction system at the top of the foundation pile, according to the position of the secondary cut at the top of the pile on the construction model, a grouting expansion bag is fixedly connected to the pile body reinforcement cage, and a concrete injection 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. The steel plate extends 150mm out of the pile body on each side.

[0020] Preferably, in step five, when the steel cage is lowered into the hole, if the weight of the steel cage is less than or equal to 3.0 tons, 2 φ14 lifting 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. One end of the lifting rod is bent into a closed shape with an inner diameter of about 200mm. If the weight of the steel cage is less than 3.0 tons, 2 φ16 lifting 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. One end of the lifting rod is bent into a circle with a diameter of about 200mm.

[0021] The design strength grade of the concrete is C40 underwater concrete, and the slump of the concrete is controlled between 180 and 220 mm. Ready-mixed concrete is selected, and the ready-mixed concrete is poured using the underwater pouring method with a diameter of 260 mm. The construction sequence is as follows: placing the reinforcing cage, installing the tremie pipe, ensuring that the water-tight plug is in close contact with the water surface inside the tremie pipe, pouring the first batch of ready-mixed concrete, continuously pouring until the top of the pile, and pulling out the casing.

[0022] Preferably, in step six, a cutting line is set at the required pile top position along the circumference of the modular recycling device for over-poured concrete. The strip area 40cm 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 reinforcing steel protective layer. The cutting depth is less than the thickness of the reinforcing steel protective layer and should not cut into the pile foundation reinforcing steel, sonic logging pipe, or grouting pipe. A pneumatic drill is used to cut the top, with the drill bit horizontal or slightly upward. The over-poured concrete is demolded and separated in sections and layers. After a sand and gravel cushion layer is applied to the pile top, the modular concrete is laid under the access road as an access road cushion layer.

[0023] Preferably, in step seven, the pre-cutting of the pile head begins after the final setting of the pile concrete and is carried out within two days of pile formation. Clean water is injected into the grouting expansion bag through a 30mm diameter seamless steel pipe. Before the concrete strength of the pile body increases significantly, the pile head is pre-cut through the grouting expansion bag for pre-separation. 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. Afterward, the grouting pressure is increased, but not higher than 5.0MPa. After the grouting is completed, the surface concrete of the high-speed rail access road is poured on the access road bedding layer for use as a high-speed rail construction access road.

[0024] Preferably, in step eight, a pneumatic hammer is used to break the pile to the design elevation at the top, followed by fine chiseling with a handheld electric hammer. For sections of the pile head that are not completely cut off, the extended steel plate is used for rapid separation. Jacks are placed at the bottom of the extended steel plate to quickly separate the pile head. The allowable deviation of the top surface after the pile head is broken is ±20mm. After adjusting the pile head reinforcement to the design elevation according to the drawings, the pile head debris and soil impurities are cleaned up.

[0025] Preferably, in step nine, the reinforcing bar connecting sleeve protection device is deployed to extend the reinforcing bars of the foundation pile body and connect them to the reinforcing bars of the upper transfer structure column.

[0026] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0027] Compared to existing technologies, the pile-column transfer construction method of this invention, which involves construction of access roads for subway and high-speed rail construction, offers several advantages.

[0028] (1) By using the pile transfer construction method that intersects with the high-speed rail construction access road, the impact of the piles on the high-speed rail access road on the horizontal transportation of the high-speed rail is avoided. The problems of piles needing to be spliced ​​twice, resulting in piles exceeding the grouting period, soil disturbance during the use of the access road causing grouting failure, and piles being easily damaged by vehicles passing through the access road are solved. The construction quality of the building piles perpendicular to the high-speed rail construction access road is improved.

[0029] (2) By using the modular recycling device for over-pouring concrete, the over-pouring concrete can be divided into layers and recycled as the subgrade of the subway access road, thus reducing the waste of concrete material resources.

[0030] (3) By using the rebar connection sleeve protection device, the installation of the rebar sleeve and the rebar protection measures are integrated, which solves the problem that the rebar in the foundation pile cannot be connected to the rebar of the upper structure using the sleeve after the pile head is broken, reduces the material waste caused by rebar lap splicing, and avoids the problem of low efficiency of rebar welding connection.

[0031] (4) By using the pre-cut concrete construction system at the top of the pile, the construction efficiency of the pile conversion structure column was improved, the quality of the pile reinforcement joint was guaranteed, the construction cost was reduced, the project progress was accelerated, and the project quality was improved. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0033] Figure 1 A flowchart of the pile transfer construction method for construction intersecting with the high-speed subway construction access road provided in Example 1;

[0034] Figure 2 A cross-sectional view of the modular recycling device for overfilled concrete provided in Example 1;

[0035] Figure 3 Provided for Example 1 Figure 2 Enlarged view of point A;

[0036] Figure 4 Provided for Example 1 Figure 2 Enlarged view of point B;

[0037] Figure 5 This is a cross-sectional view of the pre-cut concrete excavation construction system for the foundation pile top provided in Example 1.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1—Panel, 2—Nut fixing base, 3—Panel connector, 4—Rebar connection sleeve protection device, 5—Pearl foam cotton, 6—PVC protective sleeve, 14—Steel plate, 15—Grouting expansion bag, 16—Concrete pouring pipe interface, 17—Seamless steel pipe. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0042] Example 1

[0043] like Figure 1 The pile connection construction method shown includes the following steps when construction intersects with the temporary access road for subway construction:

[0044] Step 1: Establish the foundation pile construction model, the foundation pile and subway access road intersection construction model, and the foundation pile and structural column overall structure construction model.

[0045] Step 2: Laying out the lines on site.

[0046] Step 3: Assemble the modular recycling device for overfilled concrete.

[0047] Step 4: Install the rebar connection sleeve protection device 4 and install the pre-cut concrete extraction construction system at the top of the foundation pile.

[0048] Step 5: Pouring concrete below the reinforcement bars of the foundation pile.

[0049] Step Six: Modularly recycled concrete from the over-poured foundation piles is used as the subbase layer for paving the temporary access road for the subway construction.

[0050] Step 7: Construction of pre-cutting of pile heads.

[0051] Step 8: Remove the construction access road and break the concrete on top of the foundation piles.

[0052] Step 9: Connect the foundation pile reinforcement to the transfer structure column reinforcement.

[0053] In step one, the first step should be to establish an integrated construction model of the foundation pile structure location and the elevated subway construction access road. Based on the geological survey points, a comprehensive geological and topographical model should be drawn. Combined with the pile foundation design drawings, a model should be established to determine the foundation pile elevation, foundation pile height, elevated subway access road elevation, and the connection method of the foundation pile and the reinforcement of the transfer structure column. The model should be used to simulate construction, check whether the construction plan of the foundation pile and the transfer structure column is feasible, and adjust and optimize the construction steps.

[0054] In step two, a control network should first be established. Based on the plane reference points provided by the owner, multiple survey stations should be established using a total station. Then, horizontal control lines should be placed, mainly based on the main structure. Elevation lines should be marked on each of the outer facades using a level. Based on the keel positioning diagram, the steel columns should be positioned in conjunction with the plane control network and the horizontal control lines, and the anchor bolt insertion positions should be marked.

[0055] like Figures 2-3As shown, in step three, according to the model and processing drawings, the modular recycling device for over-poured concrete is assembled in the back-end processing area. The modular recycling device for over-poured concrete includes multiple pallets 1, multiple nut fixing bases 2, and multiple pallet connectors 3. The pallets 1 are made of 3mm steel plates, and each pallet is 100mm high. Before assembly, an oil-based release agent is applied to the inner surface to prevent sticking. The cross-sectional dimensions of the pallets 1 are determined according to the diameter of the foundation pile. The bottom and top sides of the pallets 1 are fixedly connected to the nut fixing bases 2 respectively. The nut fixing bases 2 at the bottom of the upper pallet 1 and the nut fixing bases 2 at the top of the lower pallet 1 are fixedly connected by the pallet connectors 3 to fix the upper and lower pallets 1 together.

[0056] Using a steel tape measure, measure the width, length, verticality of multi-stage connections, and fixation of the assembled modular recycling device for over-pouring concrete to determine if it is compatible with the processing. Figure 1 If the error is too large, rework and adjustment are required; according to the diameter of pallet 1, the modular recycling devices for over-filled concrete corresponding to different pile diameters are stacked separately and transported to the construction site before installation.

[0057] like Figure 4 As shown, in step four, when installing the rebar connection sleeve protection device 4, after the pile body rebar cage is processed, the top of the main rebar of the pile body is threaded, and the length of the thread is consistent with the length of the rebar connection sleeve protection device 4. The rebar connection sleeve protection device 4 is then screwed into the processed rebar thread. After the rebar connection sleeve protection device 4 is installed, pearl foam cotton 5 is wrapped around its surface for protection, and the top and bottom openings of the pearl foam cotton 5 are secured with cable ties. Then, a PVC protective sleeve 6 is fitted over the pearl foam cotton 5, and the top and bottom openings of the PVC protective sleeve 6 are completely wrapped with plastic film and sealed with tape.

[0058] like Figure 5 As shown, during the installation of the pre-cut concrete construction system at the top of the foundation pile, according to the position of the secondary cut at the top of the pile on the construction model, a grouting expansion bag 15 is fixedly connected to the pile body reinforcement cage, and a concrete injection pipe interface 16 is opened on the grouting expansion bag 15. A 10mm steel plate 14 is fixed on the upper part of the grouting expansion bag 15, and the steel plate 14 is temporarily fixed by binding with the main reinforcement of the pile body. The steel plate 14 extends 150mm out of the pile body on each side.

[0059] In step five, when lowering the reinforcing cage into the hole, if the weight of the reinforcing cage is less than or equal to 3.0 tons, two φ14 lifting rods are used to fix the reinforcing cage in place within the height range from the top of the reinforcing cage to the natural elevation of the site. One end of the lifting rod is bent into a closed shape with an inner diameter of about 200mm. If the weight of the reinforcing cage is less than 3.0 tons, two φ16 lifting rods are used to fix the reinforcing cage in place within the height range from the top of the reinforcing cage to the natural elevation of the site. One end of the lifting rod is bent into a circle with a diameter of about 200mm.

[0060] The design strength grade of the concrete is C40 underwater concrete, and the slump of the concrete is controlled between 180 and 220 mm. Ready-mixed concrete is selected, and the ready-mixed concrete is poured using the underwater pouring method with a diameter of 260 mm. The construction sequence is as follows: placing the reinforcing cage, installing the tremie pipe, ensuring that the water-tight plug is in close contact with the water surface inside the tremie pipe, pouring the first batch of ready-mixed concrete, continuously pouring until the top of the pile, and pulling out the casing.

[0061] In step six, a cutting line is set at the required pile top position along the circumference of the modular recycling device for over-poured concrete. The strip area 40cm 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 concrete cover. The cutting depth should be less than the thickness of the concrete cover and should not cut into the pile foundation reinforcement, sonic logging pipe, or grouting pipe. A pneumatic drill is used to cut the top, with the drill bit horizontal or slightly upward. The over-poured concrete is demolded and separated in sections and layers. After a sand and gravel cushion layer is applied to the pile top, the modular concrete is laid under the access road as the access road cushion layer.

[0062] like Figure 5 As shown, in step seven, the pre-cutting of the pile head begins after the final setting of the pile concrete and is carried out within two days of pile formation. Clean water is injected into the grouting expansion bag 15 through a seamless steel pipe 17 with a diameter of 30mm. Before the strength of the pile concrete increases significantly, the pile head is pre-cut through the grouting expansion bag 15 for pre-separation of the pile head. When the distance between the grouting operation and the hole formation operation point is not less than 10m, the grouting pressure is controlled at 2.5-4Mpa. Afterward, the grouting pressure is increased, but not higher than 5.0Mpa. After the grouting is completed, the surface concrete of the high-speed subway access road is poured on the access road bedding layer for use as a high-speed subway construction access road.

[0063] In step eight, a pneumatic hammer is used to break the pile to the design elevation at the top. Then, a handheld electric hammer is used for fine chiseling and trimming. For parts of the pile head that are not completely cut off, the extended steel plate 14 is used for quick separation. Jacks are placed 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 adjusting the pile head reinforcement to the design elevation according to the drawings, the pile head debris and soil impurities are cleaned up.

[0064] In step nine, the reinforcing bar connection sleeve protection device 4 is deployed to extend the reinforcing bars of the foundation pile body and connect them to the reinforcing bars of the upper transfer structure column.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for pile connection construction intersecting with a high-speed subway construction access road, characterized in that, Includes the following steps: Step 1: Establish the foundation pile construction model, the foundation pile and high-speed rail temporary road intersection construction model, and the foundation pile and structural column overall structure construction model; Step 2: On-site layout; Step 3: Assemble the modular recycling device for over-poured concrete; The modular recycling device for over-poured concrete includes multiple trays (1), multiple nut fixing bases (2) and multiple tray connectors (3); The trays (1) are made of 3mm steel plates, and the height of each tray is 100mm. Before assembly, the inner surface is coated with an oil-based release agent to prevent sticking. The cross-sectional dimensions of the trays (1) are determined according to the diameter of the foundation pile. The bottom and top sides of the trays (1) are fixedly connected to the nut fixing bases (2) respectively. The nut fixing bases (2) at the bottom of the upper tray (1) and the nut fixing bases (2) at the top of the lower tray (1) are fixedly connected through the tray connectors (3) to fix the upper and lower trays (1) together. Step 4: Install the rebar connection sleeve protection device (4) and install the pre-cut concrete construction system at the top of the foundation pile; when installing the rebar connection sleeve protection device (4), after the pile body rebar cage is processed, the top of the main rebar of the pile body is threaded, the length of the thread is consistent with the length of the rebar connection sleeve protection device (4), and the rebar connection sleeve protection device (4) is screwed into the processed rebar thread; after the rebar connection sleeve protection device (4) is installed, pearl foam cotton (5) is wrapped around its surface for protection, and the top and bottom openings of the pearl foam cotton (5) are tied with cable ties, and then a PVC protective sleeve (6) is sleeved on the outside of the pearl foam cotton (5), and the top and bottom openings of the PVC protective sleeve (6) are wrapped with plastic film and sealed with tape; When the pre-cut concrete construction system for the pile top is installed, according to the position of the secondary cut at the pile top on the construction model, a grouting expansion bag (15) is fixedly connected to the pile body reinforcement cage, and a concrete injection pipe interface (16) is opened on the grouting expansion bag (15). A 10mm steel plate (14) is fixed on the upper part of the grouting expansion bag (15). The steel plate (14) is temporarily fixed to the main reinforcement of the pile body. The steel plate (14) extends 150mm from the pile body on each side. Step 5: Pouring concrete below the reinforcement bars of the foundation pile; Step Six: Modularly recycled concrete from the over-poured foundation piles is used as the subbase layer for paving the temporary access road for the subway construction. Step 7: Construction of pre-cutting of pile heads; Step 8: Remove the construction access road and break the concrete at the top of the foundation piles; Step 9: Connect the foundation pile reinforcement to the transfer structure column reinforcement.

2. The pile connection construction method for construction intersecting with the high-speed rail construction access road as described in claim 1, characterized in that, In step one, a construction model integrating the location of the foundation pile structure and the construction access road for the high-speed rail is first established. A comprehensive geological and topographical model is drawn based on the geological survey points. Combined with the pile foundation design drawings, a model is established for the pile elevation, pile height, high-speed rail access road elevation, and the connection method of the pile and the reinforcement of the transfer structure column. The model is used to simulate construction, test the feasibility of the construction plan for the foundation pile and the transfer structure column, and adjust and optimize the construction steps.

3. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 2, characterized in that, In step two, a control network is first established. Based on the plane reference points provided by the owner, multiple measuring stations are established using a total station. Then, horizontal control lines are placed, mainly based on the main structure. Elevation lines are marked on each of the outer facades using a level. Based on the keel positioning diagram, the steel columns are positioned using the plane control network and the horizontal control lines, and the anchor bolt insertion positions are marked.

4. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 3, characterized in that, In step three, the super-poured concrete modular recycling device is assembled in the back-end processing area according to the model and processing drawing; the width, length, verticality of multi-level connection and fixing status of multi-level connection of the assembled super-poured concrete modular recycling device are measured with a steel tape measure to determine whether it is consistent with the processing drawing. If the error is too large, rework and adjustment are required; the super-poured concrete modular recycling devices corresponding to different pile diameters are stacked according to the diameter of the pallet (1) and transported to the construction site before installation.

5. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 4, characterized in that, In step five, when the steel cage is lowered into the hole, if the weight of the steel cage is less than or equal to 3.0 tons, 2 φ14 lifting 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. One end of the lifting rod is bent into a closed shape with an inner diameter of about 200mm. If the weight of the steel cage is less than 3.0 tons, 2 φ16 lifting 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. One end of the lifting rod is bent into a circle with a diameter of about 200mm. The design strength grade of the concrete is C40 underwater concrete, and the slump of the concrete is controlled between 180 and 220 mm. Ready-mixed concrete is selected, and the ready-mixed concrete is poured using the underwater pouring method with a diameter of 260 mm. The construction sequence is as follows: placing the reinforcing cage, installing the tremie pipe, ensuring that the water-tight plug is in close contact with the water surface inside the tremie pipe, pouring the first batch of ready-mixed concrete, continuously pouring until the top of the pile, and pulling out the casing.

6. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 5, characterized in that, In step six, a cutting line is set at the required pile top position along the circumference of the modular recycling device for over-poured concrete. The strip area 40cm 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 reinforcing steel protective layer. The cutting depth is less than the thickness of the reinforcing steel protective layer and should not cut into the pile foundation reinforcing steel, sonic logging pipe, or grouting pipe. A pneumatic drill is used to cut the top, with the drill bit horizontal or slightly upward. The over-poured concrete is demolded and separated in sections and layers. After a sand and gravel cushion layer is applied to the pile top, the modular concrete is laid under the access road as the access road cushion layer.

7. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 6, characterized in that, In step seven, the pre-cutting of the pile head begins after the final setting of the pile concrete and is carried out within two days of pile formation. Clean water is injected into the grouting expansion bag (15) through a seamless steel pipe (17) with a diameter of 30 mm. Before the strength of the pile concrete increases 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 hole formation operation point is not less than 10 m, the grouting pressure is controlled at 2.5-4 MPa. Afterward, the grouting pressure is increased, but not higher than 5.0 MPa. After the grouting is completed, the surface concrete of the high-speed rail access road is poured on the access road cushion layer for use as a high-speed rail construction access road.

8. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 7, characterized in that, In step eight, a pneumatic hammer is used to break the pile to the design elevation of the top of the pile, and then a hand-held electric hammer is used for fine chiseling and trimming. The part of the pile head that is not completely cut off is quickly separated by the extended steel plate (14). A jack is set at the bottom of the extended steel plate (14) and the pile head is quickly separated by the jack. The allowable deviation of the top surface of the pile head after breaking is ±20mm. After the pile head reinforcement is adjusted to the design elevation according to the drawings, the pile head crushed aggregate and soil impurities are cleaned up.

9. The pile connection construction method for construction intersecting with the high-speed rail construction access road according to claim 8, characterized in that, In step nine, the reinforcing bar connecting sleeve protection device (4) is unfolded to extend the reinforcing bars of the foundation pile body and connect them to the reinforcing bars of the upper conversion structure column.

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