Construction system and construction method of pile-slab connection structure of pile-slab soilless subgrade

Abstract

This invention discloses a construction system and method for a pile-slab connection structure in a soilless roadbed. The supporting components can be configured to determine the welding positions of the inner support ring and the outer steel cylinder based on the pile top elevation and the bottom elevation of the beam slab. This provides high flexibility and eliminates the need for personnel to install and dismantle temporary supporting components at height. Two opposite sides of the supporting components serve as platforms for supporting the beam slab and are connected to the construction platform for easy personnel operation. The other two sides are connected to the formwork system. The supporting components and the formwork system can be pre-connected before construction and then installed on the pile top, reducing the hassle of installing and dismantling large temporary supports. The installation accuracy control work is also shifted from aerial operations to ground operations, improving work efficiency and safety. The use of the formwork system for cast-in-place pile-slab connection structure integral casting improves the overall quality of the connection structure. This provides a reliable construction method for pile-slab roadbeds with tight schedules and high quality requirements, effectively improving the overall construction speed.

Description

Technical Field

[0001] This invention relates to the field of highway engineering technology. More specifically, this invention relates to a construction system and method for a pile-slab connection structure for soilless roadbeds. Background Technology

[0002] With the effective application of this new type of soilless roadbed structure in plain areas, the construction method is basically to erect precast beams and slabs on precast pipe piles. There are various construction methods for connecting piles and slabs and beams and slabs in China. Common methods include connecting piles and slabs with cap beams and supports, using a clamp structure to erect temporary supports and then pouring the connection joint, and using a whole slab as the connection structure in the transverse slab structure.

[0003] When using the connection method of erecting cap beams and supports between piles and slabs, the pile top elevations may differ significantly due to the prefabrication of the pipe piles. This requires adjustment through cap beams and supports, resulting in a variety of cap beam or support models. Furthermore, it is impossible to prefabricate cap beams or bring supports to the site before the pipe piles are completed. If cast-in-place cap beams are used, scaffolding and equalization are required, which delays the construction period. In addition, the uneven pile tops and different cap beam or support heights result in poor appearance.

[0004] The connection method that uses a clamp structure to erect temporary supports before pouring the connection joint has the clamp as the main load-bearing component. Temporary supports are often set on the clamp to support the beams and slabs. After the connection structure is poured and has reached strength, the clamps are removed. The positioning and installation accuracy of the clamps is difficult to guarantee, and the installation and removal of temporary supports is cumbersome and costly. At the same time, the temporary supports cannot provide a working platform during the construction of the beam and slab joint, and the use of suspended platforms or other similar methods for personnel is dangerous.

[0005] Using transverse slabs as the connecting structure requires large supporting structures, making installation, dismantling, and relocation extremely inconvenient. At the same time, the stress distribution of this type of structure is relatively unreasonable compared to longitudinal slabs, requiring stronger connecting structures to ensure stress resistance. It is costly and has low material utilization. Currently, it is mostly used for road reconstruction and expansion, and few new roads are constructed using this method. Summary of the Invention

[0006] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0007] Another objective of this invention is to provide a construction system and method for a pile-slab connection structure for soilless roadbeds, in order to solve the technical problem that the existing pile-slab connection structure for soilless roadbeds is difficult to adapt to uneven pile top heights.

[0008] To achieve these objectives and other advantages according to the present invention, a construction system for a pile-slab connection structure for soilless roadbeds is provided, comprising:

[0009] The supporting component includes an outer steel cylinder and an inner support ring. The inner support ring is welded to the inside of the outer steel cylinder. An outer steel cylinder is fitted on the top of each pipe pile. The bottom surface of the inner support ring abuts against the top surface of the pipe pile. The top elevation of the outer steel cylinder is the same as the bottom elevation of the beam slab. The upper end of each outer steel cylinder has connectors on both sides in the direction of a row of pipe piles and outwardly respectively. The two sides of the outer steel cylinder in the direction of a column of pipe piles are respectively used to support one end of the beam slab.

[0010] The template system includes a side template system and a middle template system. In each row of pipe piles, the outermost two pipe piles are provided with a side template system, and the adjacent pipe piles are provided with a middle template system. The side template system and the middle template system are respectively connected to the corresponding connectors on the pipe piles by bolts. The inner side of a row of pipe piles, together with the template system and the upper surface of the supporting components, forms the pouring area of ​​the pile-slab connection structure of the soilless roadbed.

[0011] The construction platform is set up in groups between two adjacent pipe piles in each row of pipe piles and is symmetrically connected to both sides of the central formwork system.

[0012] Preferably, the intermediate formwork system includes an intermediate formwork panel, and between two adjacent pipe piles, each of the outer steel cylinders is connected to an intermediate formwork panel by a connector, and two adjacent intermediate formwork panels are connected as one unit, and each construction platform is located on one side of the two connected intermediate formwork panels.

[0013] Preferably, the construction platform includes pocket-shaped guardrails. Guardrail inserts are inserted along a row of pipe piles at the bottom of the side of the middle formwork panel near the connector. Each pocket-shaped guardrail is connected to the ends of the guardrail inserts on the same side of the corresponding two middle formwork panels. Multiple horizontal rails are vertically connected to the inner side of the pocket-shaped guardrail opposite to the middle formwork panel. The bottom inner side of the pocket-shaped guardrail is covered with working scaffold boards.

[0014] Preferably, the connection between the connector and the side mold system, the connection between the connector and the middle mold panel, and the connection between two adjacent middle mold panels are achieved by setting two aligned mounting plates and tightening multiple bolts on the two mounting plates together.

[0015] Preferably, a plurality of reinforcing ribs are circumferentially spaced between the upper surface of the inner support ring and the inner side of the outer steel cylinder.

[0016] The present invention also provides a construction method for a pile-slab connection structure for soilless roadbed, comprising the following construction steps:

[0017] S1. After the construction of the pile-slab roadbed pipe piles is completed, the elevation and position of the top of each pipe pile are calibrated. Based on the calibration results, the connection position of the inner support ring and the outer steel cylinder at the top of the corresponding pipe pile is set in the vertical direction to ensure that the support components of a row of pipe piles are placed in the same straight line direction and the pile top is provided with an end plate.

[0018] S2. The supporting components are processed according to the settings in step S1, and connected to the middle mold system or the side mold system by bolts to form an integral structure;

[0019] S3. Fit the integrated structure from step S2 onto the top of each pipe pile according to the calibration results in step S1. After correcting the orientation of each pile, temporarily fix the adjacent integrated structures between the two intermediate formwork panels.

[0020] S4. The construction platform is symmetrically installed on both sides of the intermediate formwork system. The construction platform passes through the temporary connection point of two adjacent intermediate formwork panels. Then, the temporary fixed connection structure of step S3 is removed from the construction platform, and the adjacent intermediate formwork systems are fixedly connected. The inner support ring is fully welded to the end plate of the pile top to complete the installation of the construction system of a row of pile tops.

[0021] S5. The processed connecting steel cage is hoisted into the pipe pile, and the top of the connecting steel cage extends into the joint between the beam and slab.

[0022] S6. After the integrated structure on the two adjacent rows of pipe piles is installed, the beam is erected. The two ends of the beam are firmly supported on the two rows of opposite support members, and the wet joint reinforcement of one span of the beam is temporarily connected.

[0023] S7. After the beams and slabs of two adjacent rows are erected, the construction workers tie the joint steel bars of the beams and slabs on the construction platform and the top surface of the beams and slabs, and install side formwork between adjacent beams and slabs in the same row. At the same time, the prestressed steel bars for the pile-slab connection are installed at the center of the pipe pile. After the acceptance is qualified, the core filling concrete of the pipe pile, the pile top adjustment section concrete, the pile-slab connection concrete and the beam-slab joint concrete are poured as a whole.

[0024] S8. After the concrete strength reaches the required level, the side formwork is removed from the construction platform. The construction platform and the formwork system are then reused. The prestressed steel bars connecting the pile slab are tensioned and grouted. After the strength reaches the design requirements, the construction of the top connection structure of a row of pile slabs is completed.

[0025] Preferably, after the installation in step S4 is completed, a slot is provided on the connector. The slot is configured to match the end shape and size of the beam plate, and the beam plate is placed using the slot during erection.

[0026] Preferably, the top surface of the outer steel cylinder is processed into a matching inclined structure according to the longitudinal and transverse slopes of the top surface of the beam plate after installation.

[0027] Preferably, the guardrail insert and the pocket-shaped guardrail are connected by a pin.

[0028] Preferably, the pouring of the core-filling concrete for the pipe pile, the concrete for the pile top adjustment section, the concrete for the pile-slab connection, and the concrete for the beam-slab joint are carried out simultaneously.

[0029] The present invention has at least the following beneficial effects:

[0030] (1) The construction system of the pile-slab type soilless roadbed pile-slab connection structure of the present invention is simple and lightweight, easy to construct, safe and reliable, speeds up the construction progress, reduces the trouble of installing and dismantling large temporary supports, and changes the installation accuracy control work from aerial operation to ground operation, which not only improves the work efficiency, but also improves safety and accuracy. In addition, a more reliable construction platform is used to construct the connection, reducing the risk of personnel operation.

[0031] (2) The template system and construction platform can be reused after dismantling, which saves equipment and material rental costs. Installation is quick and dismantling does not take up actual construction time, thus reducing the construction period and reducing costs. The components are simple in structure and do not require processing by professional manufacturers, so the processing cost is low.

[0032] (3) The construction method of the pile-slab connection structure of the soilless roadbed of the present invention is to cast the structure in place as a whole, which improves the overall quality of the connection structure. It provides a reliable construction method for pile-slab roadbed with tight schedule and high quality requirements, and effectively improves the overall construction speed.

[0033] (4) By adding prestressed tendons at the pile-slab joint, the bearing capacity is further improved, the connection between the upper and lower structures is enhanced, the self-resetting ability of the structure is improved, the joint quality is better, and a series of quality problems such as cracking are less likely to occur, making it durable.

[0034] (5) The construction system of this invention can be used for the construction of all longitudinal slabs of precast pipe pile type pile slab roadbed. The formwork system can be processed into the corresponding shape according to the construction needs. The outer steel cylinder and inner support ring can be thickened or densified according to the load. No major adjustments to the structure are required. It has strong applicability for projects with tight schedules and high quality requirements.

[0035] (6) The construction system adopts a steel structure, which makes it easy to control the appearance quality. The outer steel cylinders have the same total height, so there will be no unevenness of the pipe piles due to different pile top heights. The setting of the inclined surface at the top of the outer steel cylinder can also meet the longitudinal and transverse slope requirements of the top surface of the beam and slab.

[0036] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0037] Figure 1 This is a cross-sectional view of the support member of the present invention;

[0038] Figure 2 This is a front view of the supporting member of the present invention when connected to the edge mold system;

[0039] Figure 3 This is a schematic diagram of the support member of the present invention at the connection of the intermediate mold system;

[0040] Figure 4 for Figure 2 Top view of the supporting components;

[0041] Figure 5 for Figure 2 A bottom view of the supporting components;

[0042] Figure 6 This is a front view of the supporting component of the present invention when connected to the construction platform;

[0043] Figure 7 This is a front view of the precast pipe pile after the construction of the present invention is completed;

[0044] Figure 8 This is a front view of the construction system at the top of a row of pipe piles after installation during construction, according to the present invention.

[0045] Figure 9 This is a front view of the structure of the present invention after the steel reinforcement cage has been hoisted and connected during construction;

[0046] Figure 10 This is a front view of the structure after the beams and slabs are erected and the reinforcing steel and side formwork are installed on the work platform during the construction of the present invention.

[0047] Figure 11 for Figure 10 Top view of the structure;

[0048] Figure 12 This is a front view of the structure of the present invention when the concrete is poured as a whole during construction;

[0049] Figure 13 for Figure 12 Top view of the structure;

[0050] Figure 14 This is a front view structural diagram of the present invention, showing the completion of construction by dismantling the formwork system, construction platform, and tensioning prestressing.

[0051] The following are the reference numerals in the accompanying drawings: 1. Pile-slab connection structure; 2. Pipe pile; 3. Outer steel cylinder; 4. Inner support ring; 5. Connector; 6. Side formwork system; 7. Middle formwork system; 8. Construction platform; 9. Middle formwork panel; 10. Pocket-type guardrail; 11. Guardrail insert; 12. Horizontal railing; 13. Working scaffold board; 14. Beam plate; 15. Mounting plate; 16. Bolt; 17. Reinforcing rib plate; 18. Connecting steel cage; 19. Pin shaft; 20. Pile-slab connection prestressed steel reinforcement; 21. End plate; 22. Pin hole. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0053] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] like Figure 1-14 As shown, the present invention provides a construction system for a pile-slab connection structure for soilless roadbeds, comprising:

[0055] The supporting components include an outer steel cylinder 3 and an inner support ring 4. The inner support ring 4 is welded to the inner side of the outer steel cylinder 3. An outer steel cylinder 3 is fitted on the top of each pipe pile 2. The bottom surface of the inner support ring 4 abuts against the top surface of the pipe pile 2. The top elevation of the outer steel cylinder 3 is the same as the bottom elevation of the beam slab 14. The upper end of each outer steel cylinder 3 is provided with connectors 5 on both sides in the direction of a row of pipe piles 2 and on both sides in the direction of a column of pipe piles 2, respectively, for supporting one end of the beam slab 14.

[0056] The template system includes a side template system 6 and a middle template system 7. In each row of pipe piles 2, the two outermost pipe piles 2 are provided with the side template system 6, and the middle template system 7 is provided between adjacent pipe piles 2. The side template system 6 and the middle template system 7 are respectively connected to the corresponding connecting parts 5 on the pipe piles 2 by bolts 16. The inner side of a row of pipe piles 2 and the upper surface of the template system and the supporting components form the pouring area of ​​the pile-slab connection structure 1 of the soilless roadbed.

[0057] The construction platform 8 is set in groups between two adjacent pipe piles 2 in each row of pipe piles 2 and is symmetrically connected to both sides of the middle formwork system 7.

[0058] In the existing technology, the inner side of the pipe pile 2 is used for pouring concrete to form a solid pile. The outer steel cylinder 3 and the inner support ring 4 are both steel structures that can be welded together. The inner diameter of the inner support ring 4 is slightly larger than the inner diameter of the pipe pile 2, which facilitates the insertion of the reinforcing cage 18 and also facilitates welding with the top plate 21 of the pile. Before installation, measurement and positioning are carried out to ensure that the orientation of the side formwork system 6 and the middle formwork system 7 connected to the support components is accurate and located on the transverse side of the row of pipe piles 2. The individual connection structure formed by each support component and the formwork systems on both sides is relatively light and can be easily lifted to the top of the pipe pile 2 for installation using a conventional truck crane. After the connection structure at the top of the row of piles is lifted, they are connected to each other. Construction platforms 8 are installed on both sides of the formwork system for personnel to carry out construction, thereby completing the installation of the construction system. Afterwards, the prefabricated connection... The reinforcing cage 18 is hoisted into the pipe pile 2, with its top extending into the beam-slab 14 joint to increase the connectivity between the pile and the slab. After the construction system of the top of the adjacent two rows of piles is installed, the beam-slab 14 is erected. The beam-slab 14 is stably supported on the two rows of supporting members. After all the beam-slab 14 in a row is erected, the personnel tie the reinforcing bars of the beam-slab 14 joint and install the side formwork on the installed construction platform 8. The prestressed steel bars 20 for the pile-slab connection are installed. After the steel bars and formwork are installed and accepted, the concrete of the center of the pipe pile 2, the pile slab, the beam-slab 14 joint, and the pile top adjustment section is poured to form the pile-slab connection structure 1. After the concrete strength reaches the design requirements, the formwork and the construction platform 8 are removed for reuse. After the joint construction is completed and reaches the design strength, the prestressed steel bars for the pile-slab connection are tensioned. After grouting and equal strength, the overall construction of a connection structure on a row of pipe piles 2 is completed.

[0059] The supporting components of this invention adopt a more reliable inner support ring 4, eliminating the need for personnel to install and dismantle temporary supporting components at height. Furthermore, the welding positions of the inner support ring 4 and the outer steel cylinder 3 can be set according to the pile top elevation and the bottom elevation of the beam slab 14, offering high flexibility. Two opposite sides of the supporting components serve as support platforms for the beam slab 14, while the other two sides connect to the formwork system. Before construction, the supporting components and the formwork system can be pre-connected and then installed on the pile top, reducing the hassle of installing and dismantling large temporary supports. Installation accuracy control is also shifted from aerial work to ground work, improving work efficiency and safety. The construction platform 8 facilitates personnel operation, and the formwork system and construction platform 8 can be reused after dismantling, significantly saving construction costs. The specific shapes of the connector 5 and the formwork system can be adjusted according to the shape of the corresponding project, demonstrating strong applicability.

[0060] In another technical solution, such as Figure 4 , 5As shown in Figures 8 and 9, the intermediate formwork system 7 includes an intermediate formwork panel 9. Between two adjacent pipe piles 2, each of the outer steel cylinders 3 is connected to an intermediate formwork panel 9 by a connector 5. Two adjacent intermediate formwork panels 9 are connected as one unit. Each construction platform 8 is located on one side of the two connected intermediate formwork panels 9.

[0061] After the two intermediate formwork panels 9 between two adjacent pipe piles 2 are temporarily fixed and connected, the top of a row of pipe piles 2 are connected as one piece, serving as the bottom formwork for the subsequent cast-in-place connection structure. Construction is carried out at the connection point of the two intermediate formwork panels 9 through the set construction platform 8, reducing the risk of personnel operation.

[0062] In another technical solution, such as Figure 6 , 8 As shown in Figure -13, the construction platform 8 includes pocket-shaped guardrails 10. Guardrail inserts 11 are threaded through the bottom of the middle formwork panel 9 near the connector 5 along the direction of a row of pipe piles 2. Each pocket-shaped guardrail 10 is connected to the ends of two corresponding guardrail inserts 11 on the same side of the middle formwork panel 9. Multiple horizontal railings 12 are vertically connected to the inner side of the pocket-shaped guardrail 10 opposite to the middle formwork panel 9. Working scaffold boards 13 are laid on the bottom inner side of the pocket-shaped guardrail 10. The spacing between the guardrail inserts 11 is no greater than 2m. After laying working scaffold boards 13 on the bottom of the pocket-shaped guardrail 10 and installing horizontal railings 12 on the sides, a pocket-shaped construction platform 8 is formed. Horizontal railings 12 are installed on the side of the construction platform 8 away from the pipe piles 2 for protection. Personnel stand on the working scaffold boards 13 to perform operations. The construction platform 8 and the middle formwork panel 9 are connected by guardrail inserts 11, facilitating installation, dismantling, and reuse.

[0063] In another technical solution, such as Figure 1-3 As shown in Figures 5-6, the connection between the connector 5 and the side mold system 6, the connection between the connector 5 and the middle mold panel 9, and the connection between two adjacent middle mold panels 9 are achieved by setting two aligned mounting plates 15 and tightening multiple bolts 16 on the two mounting plates 15 together.

[0064] Mounting plates 15 are formed by vertically setting or bending at the ends of connector 5 and middle mold panel 9, respectively. The two mounting plates 15 to be connected are then aligned and connected together by bolts 16. The connection method is simple to operate and easy to align and adjust.

[0065] In another technical solution, such as Figure 1-3As shown, multiple reinforcing ribs 17 are circumferentially spaced between the upper surface of the inner support ring 4 and the inner side of the outer steel cylinder 3. By setting the reinforcing ribs 17, the connection strength between the inner support ring 4 and the outer steel cylinder 3 is strengthened, and the bearing capacity at the pile top is improved. Of course, the outer steel cylinder 3 and the inner support ring 4 can be thickened or the stiffening plates can be reinforced according to the load, and the overall structural form does not need to be significantly adjusted.

[0066] This invention also provides a construction method for a pile-slab connection structure 1 for soilless roadbed, such as... Figure 1-14 As shown, the construction steps include the following:

[0067] S1, such as Figure 7 As shown, after the construction of the pile-slab roadbed pipe piles 2 is completed, the elevation and position of the top of each pipe pile 2 are calibrated. Based on the calibration results, the connection position of the inner support ring 4 and the outer steel cylinder 3 at the top of the corresponding pipe pile 2 in the vertical direction is set to ensure that the support components of a row of pipe piles 2 are located in the same straight direction after placement. The top of the pile is provided with an end plate 21.

[0068] The top of pipe pile 2 is measured to ensure its elevation and deviation are within allowable limits. Calibration crosshairs are marked on the pile top and side for connection structure installation calibration. Based on the pile top measurement results, the welding position of the inner support ring 4 on the outer steel cylinder 3 is calculated, and the two are machined and welded on the ground. The steel type, bolt size 16, and weld requirements for each component used in the fabrication of the support structure and formwork system should be selected based on the structural design and calculation analysis. The welding quality between the outer steel cylinder 3 and the inner support ring 4 directly affects the safety of the entire structure; therefore, the welding quality must be strictly controlled to ensure both a strong weld and no damage to the steel pipe.

[0069] S2. The supporting components are processed according to the settings of step S1, and connected to the middle mold system 7 or the side mold system 6 by bolts 16 to form an integral structure.

[0070] S3, such as Figure 8 As shown, the integrated structure from step S2 is fitted onto the top of each pipe pile 2 according to the calibration in step S1. After correcting the orientation of each pile, adjacent integrated structures are temporarily fixedly connected between the two intermediate formwork panels 9. This can be temporarily fixed by inserting pins into the bolt holes of the adjacent intermediate formwork joints.

[0071] S4, Combination Figure 8As shown, the construction platform 8 is symmetrically installed on both sides of the intermediate formwork system 7. The construction platform 8 passes through the temporary connection points of two adjacent intermediate formwork panels 9. Then, the temporary fixed connection structure of step S3 is removed from the construction platform 8, and the adjacent intermediate formwork systems 7 are fixedly connected. The inner support ring 4 is fully welded to the end plate 21 of the pile top, completing the installation of the construction system for a row of pile tops. After the construction platform 8 is formed, personnel install and tighten the bolts 16 between the intermediate formwork panels inside the construction platform 8. First, some bolts 16 are installed, then the temporary fixing pins are removed, and then all bolts 16 are installed and tightened.

[0072] S5, such as Figure 9 As shown, the pre-fabricated connecting steel cage 18 is hoisted into the pipe pile 2, with the top of the connecting steel cage 18 extending to the joint between the subsequent beams and slabs 14. The joint between the beams and slabs 14 is the area to be poured between two opposing beams and slabs 14 after the beams and slabs 14 are erected. When the pre-fabricated connecting steel cage 18 is hoisted into the pipe pile 2, measures are set around it to control its position and prevent it from shifting or floating during the pouring process.

[0073] S6, such as Figure 10-11 As shown, after the integrated structure on the two adjacent rows of pipe piles 2 is installed, the beam 14 is erected. The two ends of the beam 14 are firmly supported on the two rows of opposite support members, and the wet joint reinforcement of one span of the beam 14 is temporarily connected.

[0074] S7, such as Figure 12-13 As shown, after the erection of two adjacent rows of beams 14, construction workers tie the joint reinforcement bars of the beams 14 on the construction platform 8 and the top surface of the beams 14, and install side formwork between adjacent beams 14 in the same row. Simultaneously, prestressed steel bars 20 for pile-slab connection are installed at the center of the pipe piles 2. After acceptance, the core-filling concrete of the pipe piles 2, the pile top adjustment section concrete, the pile-slab connection concrete, and the beam-slab 14 joint concrete are poured as a whole. Wooden formwork is used for the side formwork, which is installed by workers on the construction platform 8. After pouring, the side formwork is removed and reused.

[0075] S8, such as Figure 14 As shown, after the concrete reaches the required strength, the side formwork is removed from the construction platform 8. The construction platform 8 and the formwork system are then reused. The prestressed steel bars 20 connecting the pile slab are tensioned and grouted. After the strength reaches the design requirements, the construction of the top connection structure of one row of pile slabs is completed. The supporting components are permanent structures and are not removed after construction. Only the formwork system and the working platform are removed. At the same time, the supporting components also serve as the side formwork for the pile top adjustment section. Vertical prestressing is set in the pile slab connection section. After the connection section is poured as a whole and reaches strength, it is tensioned to further improve the bearing capacity of the top of the pipe pile 2, strengthen the connection between the upper and lower structures, and improve the self-resetting performance of the structure.

[0076] The construction method of the pile-slab type soilless roadbed pile-slab connection structure 1 of the present invention provides a reliable construction method for pile-slab type roadbeds with tight construction period and high quality requirements. After the integrated structure is welded on the ground, it is directly hoisted to the pile top for alignment and installation. Compared with the conventional construction method that requires the erection of temporary supports or construction cap beams, it saves a long construction time. It is convenient to dismantle and does not occupy actual construction time, and does not affect the total construction period.

[0077] In another technical solution, after installation in step S4, a slot is provided on the connector 5. The slot is configured to match the end shape and size of the beam 14, and the beam 14 is placed using the slot during erection. This facilitates the erection of the beam 14 and improves construction efficiency.

[0078] In another technical solution, the top surface of the outer steel cylinder 3 is machined into a matching inclined structure based on the longitudinal and transverse slopes of the top surface of the beam 14 after installation. This ensures that the longitudinal and transverse slopes of the surface of the erected beam 14 meet design requirements.

[0079] In another technical solution, such as Figure 6 As shown, the guardrail insert 11 and the pocket-shaped guardrail 10 are connected by a pin 19. The pocket-shaped guardrail 10 is inserted downwards between the two guardrail inserts 11. A vertical pin hole 22 is provided at the end of the guardrail insert 11. The pocket-shaped guardrail 10 and the guardrail insert 11 are fixed by inserting a pin 19 into the pin hole 22. The pin 19 is used to ensure that the guardrail will not come out after being impacted. The construction platform 8 and the middle formwork panel 9 are connected by the guardrail insert 11, which facilitates installation, disassembly and reuse.

[0080] In another technical solution, such as Figure 12 As shown, the pouring of the core-filling concrete of the pipe pile 2, the concrete of the pile top adjustment section, the concrete of the pile-slab connection, and the concrete of the beam-slab joint 14 are carried out simultaneously. The construction process does not require consideration of equal strength time, which can effectively improve the overall construction speed.

[0081] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A construction system for pile-slab connection structures in soilless roadbeds, characterized in that, include: The supporting component includes an outer steel cylinder and an inner support ring. The inner support ring is welded to the inside of the outer steel cylinder. An outer steel cylinder is fitted on the top of each pipe pile. The bottom surface of the inner support ring abuts against the top surface of the pipe pile and the inner support ring is fully welded to the end plate at the top of the pile. The vertical connection position between the inner support ring and the outer steel cylinder is set according to the elevation and position calibration results of the top of each pipe pile, so that the top elevation of the outer steel cylinder is the same as the bottom elevation of the beam plate. The upper end of each outer steel cylinder has connectors on both sides in the direction of a row of pipe piles and is used to support one end of the beam plate on both sides in the direction of a column of pipe piles. The formwork system includes a side formwork system and a middle formwork system. In each row of pipe piles, the outermost two pipe piles are provided with a side formwork system, and the adjacent pipe piles are provided with a middle formwork system. The middle formwork system includes a middle formwork panel. Between two adjacent pipe piles, each outer steel cylinder is connected to a middle formwork panel by a connector. The two adjacent middle formwork panels are connected as one unit. The connectors at corresponding positions are connected to the side formwork system, the connectors are connected to the middle formwork panels, and the two adjacent middle formwork panels are connected by two aligned mounting plates and multiple bolts are tightened on the two mounting plates. The inner side of a row of pipe piles, the formwork system, and the upper surface of the supporting components form the pouring area of ​​the pile-slab connection structure of the soilless roadbed. Joint reinforcement is provided between the beams and slabs, and prestressed reinforcement for pile-slab connection is provided upward at the center of the pipe pile. The construction platforms are set in groups between two adjacent pipe piles in each row of pipe piles and are symmetrically connected to both sides of the middle formwork system. Each construction platform is set on one side of the two connected middle formwork panels. The construction platform includes pocket-shaped guardrails. Guardrail inserts are inserted along a row of pipe piles at the bottom of the side of the middle formwork panel near the connector. Each pocket-shaped guardrail is connected to the ends of the guardrail inserts on the same side of the corresponding two middle formwork panels. Multiple horizontal rails are vertically connected to the inner side of the pocket-shaped guardrail opposite to the middle formwork panel. Working scaffold boards are laid on the bottom inner side of the pocket-shaped guardrail.

2. The construction system for pile-slab connection structure of soilless roadbed as described in claim 1, characterized in that, Multiple reinforcing ribs are circumferentially spaced between the upper surface of the inner support ring and the inner side of the outer steel cylinder.

3. The construction method of the pile-slab connection structure construction system for soilless roadbed as described in claim 1, characterized in that, The construction steps include the following: S1. After the construction of the pile-slab roadbed pipe piles is completed, the elevation and position of the top of each pipe pile are calibrated. Based on the calibration results, the connection position of the inner support ring and the outer steel cylinder at the top of the corresponding pipe pile is set in the vertical direction to ensure that the support components of a row of pipe piles are placed in the same straight line direction and the pile top is provided with an end plate. S2. The supporting components are processed according to the settings in step S1, and connected to the middle mold system or the side mold system by bolts to form an integral structure; S3. Fit the integrated structure from step S2 onto the top of each pipe pile according to the calibration results in step S1. After correcting the orientation of each pile, temporarily fix the adjacent integrated structures between the two intermediate formwork panels. S4. The construction platform is symmetrically installed on both sides of the intermediate formwork system. The construction platform passes through the temporary connection point of two adjacent intermediate formwork panels. Then, the temporary fixed connection structure of step S3 is removed from the construction platform, and the adjacent intermediate formwork systems are fixedly connected. The inner support ring is fully welded to the end plate of the pile top to complete the installation of the construction system of a row of pile tops. S5. The processed connecting steel cage is hoisted into the pipe pile, and the top of the connecting steel cage extends into the joint between the beam and slab. S6. After the integrated structure on the two adjacent rows of pipe piles is installed, the beam is erected. The two ends of the beam are firmly supported on the two rows of opposite support members, and the wet joint reinforcement of one span of the beam is temporarily connected. S7. After the beams and slabs of two adjacent rows are erected, the construction workers tie the joint steel bars of the beams and slabs on the construction platform and the top surface of the beams and slabs, and install side formwork between adjacent beams and slabs in the same row. At the same time, the prestressed steel bars for the pile-slab connection are installed at the center of the pipe pile. After the acceptance is qualified, the core filling concrete of the pipe pile, the pile top adjustment section concrete, the pile-slab connection concrete and the beam-slab joint concrete are poured as a whole. S8. After the concrete strength reaches the required level, the side formwork is removed from the construction platform. The construction platform and the formwork system are then reused. The prestressed steel bars connecting the pile slab are tensioned and grouted. After the strength reaches the design requirements, the construction of the top connection structure of a row of pile slabs is completed.

4. The construction method of the pile-slab connection structure construction system for soilless roadbed as described in claim 3, characterized in that, After step S4 is completed, a slot is set on the connector. The slot is set to match the shape and size of the end of the beam plate. The slot is used to place the beam plate when it is erected.

5. The construction method of the pile-slab connection structure construction system for soilless roadbed as described in claim 3, characterized in that, The top surface of the outer steel cylinder is processed into a matching inclined structure based on the longitudinal and transverse slopes of the beam plate after installation.

6. The construction method of the pile-slab connection structure construction system for soilless roadbed as described in claim 3, characterized in that, The guardrail insert and the pocket-shaped guardrail are connected by a pin.

7. The construction method of the pile-slab connection structure construction system for soilless roadbed as described in claim 3, characterized in that, The pouring of the core-filling concrete for the pipe pile, the concrete for the pile top adjustment section, the concrete for the pile-slab connection, and the concrete for the beam-slab joint are carried out simultaneously.

Images