Detachable turnover support pile top steel structure crown beam support system and construction method

Abstract

The present application relates to a kind of detachable turnover support pile top steel structure crown beam support system and construction method, the support system includes: multiple support piles arranged along foundation pit boundary line;Multiple steel structure crown beams are spliced in sequence, steel structure crown beam is across the pile top of multiple support piles;Multiple anchor cables, the lower end of each anchor cable is anchored in the pile body of a support pile, the upper end is up and out of pile top and is locked on steel structure crown beam, so that steel structure crown beam and support pile are connected as a whole;Wherein, multiple steel structure crown beams, and between steel structure crown beam and support pile are detachable fixed connection.This support system is constructed in field without needing to carry out steel bar binding, formwork, concrete pouring and maintenance etc. Traditional wet operation, so as to greatly shorten construction period, improve construction efficiency and safety;Meanwhile, steel structure crown beam can be recycled and recycled, can reduce construction cost, reduce building material consumption and construction waste, meet green construction and sustainable development concept.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology in geotechnical engineering, and more specifically, to a detachable and reusable support pile top steel structure cap beam support system and construction method. Background Technology

[0002] In foundation pit engineering, retaining piles are a common retaining structure. To enhance the overall stability of the retaining piles, control the displacement of the pile tops, and facilitate the installation of subsequent supports or anchors, a continuous capping beam is usually installed at the top of the retaining piles to connect the individual retaining piles into a cohesive pile structure that bears the load together.

[0003] Currently, the vast majority of traditional pile-top capping beams are constructed using cast-in-place reinforced concrete. The conventional construction process is as follows: after the retaining piles are completed and reach a certain strength, the pile heads are manually chiseled to the design elevation. Then, the capping beam reinforcement cage is tied at the pile top, side formwork is erected, concrete is poured, and after necessary curing, the concrete is allowed to reach its design strength before subsequent excavation or support construction can proceed. This traditional process has many drawbacks: First, the procedures are complex, including pile head chiseling, reinforcement work, formwork work, concrete pouring and curing, resulting in a long construction period and occupying critical time slots. Second, it requires the cooperation of multiple trades, leading to complex on-site organization and management and low efficiency. Third, the cast-in-place concrete capping beam is a one-time investment; after the foundation pit is backfilled, it is buried underground and cannot be recycled, resulting in significant material waste and failing to meet the requirements of green construction and sustainable development. Finally, when the concrete capping beam is constructed in sections, quality problems easily occur at the joints, resulting in poor appearance, and the concrete material has weak tensile strength, making it prone to cracking in tension areas.

[0004] Therefore, developing a new type of pile top cap beam support that can overcome the above-mentioned defects and achieve rapid assembly, reusability, energy saving and environmental protection has important engineering significance and economic value. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a detachable and reusable support system and construction method for the steel structure cap beam of the support pile top, in order to solve the problems existing in the prior art.

[0006] According to a first aspect of the present invention, a detachable and reusable support pile top steel structure capping beam support system is provided, comprising: Multiple support piles arranged along the edge of the foundation pit; A steel structure cap beam is constructed by sequentially splicing multiple segments, and the steel structure cap beam spans across the top of the multiple support piles; Multiple anchor cables are used, with the lower end of each anchor cable anchored inside the pile body of a support pile, and the upper end extending upward through the top of the pile and tensioned and locked to the steel structure cap beam, thereby connecting the steel structure cap beam and the support pile into a whole. Among them, the steel structure cap beams are detachable and fixedly connected to each other, as are the steel structure cap beams and the support piles.

[0007] Preferably, the steel structure cap beam includes: a steel main beam as a horizontal load-bearing member; multiple vertical stiffening ribs arranged at intervals along the length of the steel main beam, the vertical stiffening ribs being fixedly connected to the steel main beam; and anchor cable connection assemblies disposed on the steel main beam at positions corresponding to the support piles, the upper ends of the anchor cables being locked by the anchor cable connection assemblies.

[0008] Preferably, the main steel beam is an H-beam, and the web plane of the H-beam is perpendicular to the edge of the foundation pit; the vertical stiffening rib is a steel plate, and the vertical stiffening plate is welded between the flanges of the H-beam.

[0009] Preferably, the anchor cable connection assembly includes: a steel pad fixed to the top surface of the steel main beam, the steel pad having a through hole in the center for the anchor cable to pass through; and an anchor fitting sleeved on the upper end of the anchor cable and pressed against the top surface of the steel pad.

[0010] Preferably, the steel pad is fixedly connected to the top surface of the main steel beam by welding.

[0011] Preferably, the ends of two adjacent sections of the steel structure cap beam are connected by a connecting plate and high-strength bolts.

[0012] Preferably, when the support piles are double-row support piles, it also includes a steel structure connecting beam that connects the tops of the two rows of support piles to the steel structure cap beam, and the two ends of the steel structure connecting beam are detachably fixed to the steel structure cap beam.

[0013] Preferably, the steel structure connecting beam is a steel section member, and the connection point between the steel structure connecting beam and the steel structure cap beam is located at the vertical stiffening rib of the steel structure cap beam or on a specially designed connecting end plate.

[0014] According to a second aspect of the present invention, a construction method for a detachable and reusable support pile top steel structure cap beam support system as described above is provided, comprising the following steps: S1. Prefabricate the steel structure cap beam in the factory; S2. Anchor cables are pre-embedded and installed in the steel cage of the support pile, and then concrete is poured to form the support pile. S3. Chisel the pile heads of the support piles down to the design elevation, and measure and set out the installation position of the steel structure cap beam; S4. Hoist each section of the steel structure cap beam to the top of the support pile and position it so that the anchor cable pre-embedded at the top of the support pile passes through the anchor cable connection assembly on the steel structure cap beam. S5. Install anchorages at the upper end of the anchor cables and tension and lock them to connect the steel structure cap beam and the support piles into one unit; S6. High-strength bolts are used to connect and fix adjacent sections of the steel structure cap beam.

[0015] Preferably, when the support piles are double-row support piles, steel structure connecting beams are prefabricated in the factory at the same time; after the steel structure capping beams on the top of the two rows of support piles are installed, multiple steel structure connecting beams are connected and fixed between the steel structure capping beams on the top of the two rows of support piles.

[0016] The present invention provides a detachable and reusable steel structure cap beam support system for retaining piles and its construction method. By combining prefabricated steel structure cap beams with prestressed anchor cables, the support system eliminates the need for traditional wet operations such as rebar tying, formwork, concrete pouring, and curing on-site. Only assembly processes such as hoisting, bolting, and tensioning are required, significantly shortening the construction period and improving construction efficiency and safety. The prestressed anchor cables actively tension the steel structure cap beam and the retaining piles into a unified whole, significantly enhancing the constraint stiffness at the top of the retaining piles and the overall stability of the foundation pit. Furthermore, the steel structure cap beam is detachable, recyclable, and reusable, which not only significantly reduces the cost of materials for a single project but also reduces building material consumption and construction waste, aligning with the concepts of green construction and sustainable development. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

[0018] Figure 1 A structural schematic diagram of a detachable and reusable support pile top steel structure cap beam support system according to an embodiment of the present invention is shown.

[0019] Figure 2 Another structural schematic diagram of a detachable and reusable support pile top steel structure cap beam support system according to an embodiment of the present invention is shown.

[0020] In the diagram: 1. Support pile; 2. Anchor cable; 3. Steel main beam; 4. Vertical stiffening rib; 5. Steel pad; 6. Anchor; 7. Steel structure connecting beam. Detailed Implementation

[0021] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0022] This invention provides a detachable and reusable support system for the steel structure capping beam at the top of the support piles, see [link / reference]. Figure 1The detachable and reusable steel structure cap beam support system for the support piles includes: multiple support piles 1 arranged along the edge of the foundation pit; multiple steel structure cap beams spliced ​​in sequence, the steel structure cap beams spanning the tops of the multiple support piles 1; and multiple anchor cables 2, the lower end of each anchor cable 2 being anchored to the pile body of a support pile 1, and the upper end extending upward through the pile top and tensioned and locked onto the steel structure cap beam, thereby connecting the steel structure cap beam and the support piles 1 into a whole; wherein, the multiple steel structure cap beams and the steel structure cap beams and the support piles 1 are all detachably fixed connections.

[0023] Specifically, anchor cables 2 can be pre-embedded in the reinforcing cage of the support piles 1 before the piles 1 are poured, and the anchor cables 2 are vertically positioned at the center of the support piles 1. The steel cap beam can be prefabricated in the factory and transported to the construction site for installation. During construction, it is hoisted to the top of the support piles and directly installed by tensioning and locking the anchor cables 2. Compared with traditional concrete cap beam construction, there is no need for traditional wet operations such as rebar tying, formwork, concrete pouring and curing on site. Only prefabricated processes such as hoisting and tensioning are required, which greatly shortens the construction period and improves construction efficiency and safety.

[0024] Further, the steel structure capping beam includes: a main steel beam 3 serving as a horizontal load-bearing member; multiple vertical stiffening ribs 4 spaced apart along the length of the main steel beam 3, the vertical stiffening ribs 4 being fixedly connected to the main steel beam 3; and anchor cable 2 connection assemblies disposed on the main steel beam 3 corresponding to the positions of the support piles 1, the upper ends of the anchor cables 2 being locked by the anchor cable 2 connection assemblies. In this embodiment, the main steel beam 3 is an H-beam, the web plane of the H-beam being perpendicular to the edge line of the foundation pit; the vertical stiffening ribs 4 are steel plates, the vertical stiffening plates being welded between the flanges of the H-beam. Using H-beams as the main steel beam 3 of the steel structure capping beam, and with the web plane of the H-beam perpendicular to the edge line of the foundation pit, allows the strong axis of the H-beam to effectively resist the bending moment transmitted from the soil pressure outside the foundation pit to the pile top. Vertical stiffening ribs 4 are symmetrically arranged on both sides of the web of the H-beam. In specific implementation, multiple vertical stiffening ribs 4 are welded at certain intervals along the length of the H-beam. The vertical stiffening ribs 4 are rectangular steel plates, and their height matches the cross-sectional height of the H-beam. The vertical stiffening ribs 4 divide the flange of the H-beam, significantly improving the local buckling resistance of the cross-section, enhancing the local bearing capacity and overall stability of the H-beam flange, and preventing local deformation under the tension of the anchor cable 2. Further, the anchor cable 2 connection assembly includes: a steel pad 5 fixed to the top surface of the main steel beam 3, the steel pad 5 having a through hole in the center for the anchor cable 2 to pass through; and an anchor 6 sleeved on the upper end of the anchor cable 2 and pressed against the top surface of the steel pad 5. Preferably, the steel pad 5 is fixedly connected to the top surface of the main steel beam 3 by welding. The anchor cable 2 connection assembly is the key to realizing the coordinated force sharing between the steel structure cap beam and the support pile 1. In this embodiment, during the factory prefabrication stage, a square or circular steel pad 5 can be welded to the top surface of the upper flange of the H-beam, corresponding to the center position of each support pile 1. The steel pad 5 is generally 20-40mm thick, with a through hole slightly larger than the diameter of the anchor cable 2 drilled in the center; correspondingly, a through hole for the anchor cable 2 to pass through is also drilled on the H-beam. The anchor cable 2 is a steel strand or a finely rolled threaded steel bar. Before the support pile 1 is poured, its lower end is reliably connected to the reinforcing cage of the support pile 1 through a special anchoring device or by welding, and is lowered together with the reinforcing cage and poured into the pile body concrete. Sufficient tension length is reserved at the upper end of the anchor cable 2 to pass through the top of the pile.

[0025] Furthermore, the ends of two adjacent steel structure cap beams are connected by connecting plates and high-strength bolts. In this embodiment, bolt holes are pre-set on the H-beam web and upper and lower flanges at the ends of each steel structure cap beam. During installation, multiple connecting plates are placed over the joint, and high-strength bolts are passed through the bolt holes in the connecting plates and H-beams and tightened. This method provides high connection strength, quick construction, and facilitates subsequent disassembly.

[0026] During on-site construction of this support system, after the concrete of the support piles 1 reaches its strength and the pile heads are chiseled, the prefabricated steel structure cap beam is hoisted into place, allowing the upper end of each anchor cable 2 to pass through the through hole of the corresponding steel pad 5 in sequence. Then, a through-type anchor, such as a wedge anchor, is installed on the part of the anchor cable 2 exposed on the steel pad 5. A hydraulic jack is used to tension the anchor cable 2, and after reaching the design prestress value, the anchor 6 is locked. At this point, the anchor 6 presses tightly against the steel pad 5, and the huge prestress is transferred to the H-beam through the steel pad 5, and then distributed to the adjacent support piles 1 through the rigidity of the H-beam, thus forming a whole with all the support piles 1 and the steel structure cap beam. After the underground structure of the foundation pit is completed and the earthwork is backfilled, the steel structure cap beam can be dismantled and recycled. The dismantling process is the reverse of the construction process: first, the high-strength bolts connecting adjacent sections of the steel structure cap beam are removed with a wrench, separating the connecting plates. Then, a special anchor release tool is used to loosen the anchor 6, relieving its pressure on the steel pad 5. Finally, a crane is used to lift the disconnected sections of the steel capping beams away from the foundation pit. After cleaning and anti-corrosion treatment, the lifted steel capping beams can be stored in a warehouse, awaiting transfer to the next project. Furthermore, such as... Figure 2 As shown, when the support pile 1 is a double-row support pile 1, the support system also includes a steel structure connecting beam 7 that connects the tops of the two rows of support piles to the steel structure cap beam. The two ends of the steel structure connecting beam 7 are detachably fixed to the steel structure cap beam. Specifically, the steel structure connecting beam 7 is preferably a steel component (such as channel steel, H-beam, etc.), and its connection point with the steel structure cap beam is located at the vertical stiffening rib 4 of the steel structure cap beam or a specially designed connecting end plate to ensure the rigidity and strength of the connection node. For example, connecting end plates can be welded to both ends of the steel structure cap beam, and connecting end plates can also be welded to the vertical stiffening rib 4 of the steel structure cap beam. Bolt holes are opened on the connecting end plates. During installation, the steel structure connecting beam 7 is hoisted into place so that the connecting end plate at the end of the steel structure connecting beam 7 is close to the connecting end plate at the vertical stiffening rib 4 of the corresponding row of steel structure cap beams. Then, high-strength bolts are used to pass through the bolt holes on the connecting end plates for fastening. In this way, the two rows of steel cap beams are connected by steel connecting beams 7 to form a stable space truss structure with better support performance. During disassembly, only these connecting bolts need to be removed to dismantle and recycle the steel connecting beams 7 individually. It is understood that the steel cap beams and steel connecting beams 7 can also be connected using connecting plates and high-strength bolts, as described above regarding the connection methods between adjacent sections of the steel cap beams.

[0027] The present invention also provides a construction method for the detachable and reusable support pile top steel structure cap beam support system as described above, the construction method comprising the following steps: S1. Prefabricate the steel structure cap beam in the factory.

[0028] Specifically, the main steel beam 3 of the steel structure cap beam can be made of hot-rolled H-beams or welded from steel plates. During prefabrication, the steel pad 5 and the vertical stiffening ribs 4 are welded together to the corresponding positions of the main steel beam 3.

[0029] S2. Anchor cables 2 are pre-embedded and installed in the steel cage of the support pile, and then concrete is poured to form the support pile 1.

[0030] Specifically, the anchor cable 2 is vertically installed at the center of the support pile reinforcement cage. The lower end of the anchor cable 2 can be reliably connected to the support pile reinforcement cage through a special anchoring device or by welding. The upper end of the anchor cable 2 extends out of the upper end of the support pile reinforcement cage, reserving sufficient tensioning length to facilitate subsequent tensioning and locking of the steel structure cap beam.

[0031] S3. Chisel the head of the support pile 1 to the design elevation, and measure and set out to determine the installation position of the steel structure cap beam.

[0032] S4. Hoist each section of the steel structure cap beam to the top of the support pile 1 and place it in place, so that the anchor cable 2 pre-embedded at the top of the support pile 1 passes through the anchor cable 2 connection assembly on the steel structure cap beam.

[0033] S5. Install anchorage 6 at the upper end of anchor cable 2 and tension and lock it to connect the steel structure cap beam and the support pile 1 into one unit.

[0034] Specifically, anchor 6 is a through-type anchor, such as a wedge anchor. During tensioning and locking, a hydraulic jack is used to tension the anchor cable 2. After reaching the design prestress value, anchor 6 is locked. At this time, anchor 6 presses tightly against steel pad 5, and the huge prestress is transmitted to the steel main beam 3 through steel pad 5. Then, the stiffness of the steel main beam 3 distributes the force to the adjacent support piles 1, thereby making all support piles 1 and the steel structure cap beam form an integral whole.

[0035] S6. High-strength bolts are used to connect and fix adjacent sections of the steel structure cap beam.

[0036] Specifically, bolt holes are pre-set on the web and upper and lower flanges of the H-beam at the end of each section of the steel structure cap beam. During installation, multiple connecting plates are placed over the joint, and high-strength bolts are passed through the bolt holes of the connecting plates and H-beams and tightened.

[0037] When the support pile 1 is a double row of support piles 1, the steel structure connecting beam 7 is prefabricated in the factory at the same time; after the steel structure cap beams on the top of the two rows of support piles 1 are installed, multiple steel structure connecting beams 7 are connected and fixed between the steel structure cap beams on the top of the two rows of support piles 1.

[0038] Specifically, the steel structure connecting beam 7 is preferably a steel component, and its connection point with the steel structure cap beam is located at the vertical stiffening rib 4 of the steel structure cap beam or on a specially designed connecting end plate to ensure the rigidity and strength of the connection node. In practice, connecting end plates can be welded to both ends of the steel structure cap beam, and connecting end plates can also be welded to the vertical stiffening rib 4 of the steel structure cap beam. Bolt holes are provided on the connecting end plates. During installation, the steel structure connecting beam 7 is hoisted into position, ensuring that the connecting end plates at the ends of the steel structure connecting beam 7 are tightly fitted against the connecting end plates at the vertical stiffening rib 4 of the corresponding row of steel structure cap beams. Then, high-strength bolts are used to tighten them through the bolt holes on the connecting end plates. In this way, the two rows of steel structure cap beams are connected into a stable spatial truss structure through the steel structure connecting beam 7, resulting in better support performance. The steel structure cap beams and steel structure connecting beams 7 can also be connected using connecting plates and high-strength bolts; see the connection methods between adjacent sections of steel structure cap beams for reference.

[0039] The dismantling and recycling method of the detachable and reusable support pile top steel structure cap beam support system includes the following steps: after the foundation pit is backfilled, the connection between the steel structure connecting beam 7 and the steel structure cap beam is removed; the connection between adjacent sections of the steel structure cap beam is removed; the anchors 6 of all anchor cables 2 are loosened and removed; the anchor cables 2 are pulled out from the steel structure cap beam; each section of the steel structure cap beam is lifted away, cleaned and maintained, and then reused.

[0040] Compared with the prior art, the present invention has the following significant advantages: Highly efficient construction and shortened construction period: The steel structure cap beam and steel structure connecting beam are all prefabricated in the factory, and only hoisting, connection and tensioning operations are carried out on site, realizing the industrialized construction mode of "factory prefabrication and on-site assembly". It completely eliminates the time for on-site rebar tying, formwork erection, concrete pouring and lengthy curing, which can greatly shorten the construction period of the cap beam at the top of the support piles and create conditions for accelerating the entire foundation pit project.

[0041] Reliable quality and superior performance: Factory production ensures precise component dimensions, controllable welding quality, and thorough corrosion protection, resulting in quality far superior to on-site outdoor operations. The high strength and toughness of the steel structure material allow for lightweight yet robust cap beam components. The active constraint system formed by anchor cable tensioning ensures a tighter and more reliable connection between piles and beams, resulting in high overall stiffness and excellent displacement control.

[0042] Demountable and reusable, offering significant economic benefits: After backfilling the foundation pit, the steel cap beam and steel connecting beams can be completely disassembled and lifted out by releasing the bolt connections and anchor cable prestress. After simple cleaning, repair, and repainting, they can be reused in other projects. This achieves the recycling of major structural materials, significantly reducing project material costs, with the amortized cost per use being far lower than that of a disposable concrete cap beam.

[0043] Green and environmentally friendly, in line with sustainable development: It reduces construction waste (such as pile fragments and discarded formwork), dust, and noise pollution at the construction site. The steel structure has an extremely high recycling rate, which greatly saves the consumption of non-renewable resources such as cement and sand, reduces carbon emissions, and has outstanding social and environmental benefits.

[0044] Highly adaptable and with broad application prospects: This form is not only suitable for single-row piles, but can also be easily extended to complex support systems such as double-row piles and lattice piles by setting steel structural connecting beams. Its modular and standardized characteristics also facilitate its application in foundation pit projects of different scales and shapes.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A detachable and reusable support system for the top steel structure capping beam of support piles, characterized in that, include: Multiple support piles arranged along the edge of the foundation pit; A steel structure cap beam is constructed by sequentially splicing multiple segments, and the steel structure cap beam spans across the top of the multiple support piles; Multiple anchor cables are used, with the lower end of each anchor cable anchored inside the pile body of a support pile, and the upper end extending upward through the top of the pile and tensioned and locked to the steel structure cap beam, thereby connecting the steel structure cap beam and the support pile into a whole. Among them, the steel structure cap beams are detachable and fixedly connected to each other, as are the steel structure cap beams and the support piles.

2. The detachable and reusable support pile top steel structure cap beam support system according to claim 1, characterized in that, The steel structure cap beam includes: a steel main beam as a horizontal load-bearing member; multiple vertical stiffening ribs arranged at intervals along the length of the steel main beam, the vertical stiffening ribs being fixedly connected to the steel main beam; and anchor cable connection assemblies set on the steel main beam at positions corresponding to the support piles, the upper ends of the anchor cables being locked by the anchor cable connection assemblies.

3. The detachable and reusable support pile top steel structure cap beam support system according to claim 2, characterized in that, The main steel beam is an H-beam, and the web plane of the H-beam is set perpendicular to the edge line of the foundation pit; the vertical stiffening rib is a steel plate, and the vertical stiffening plate is welded between the flange plates of the H-beam.

4. The detachable and reusable support pile top steel structure cap beam support system according to claim 2, characterized in that, The anchor cable connection assembly includes: a steel pad fixed to the top surface of the steel main beam, the steel pad having a through hole in the center for the anchor cable to pass through; and an anchor fitting sleeved on the upper end of the anchor cable and pressed against the top surface of the steel pad.

5. The detachable and reusable support pile top steel structure cap beam support system according to claim 4, characterized in that, The steel pad is fixedly connected to the top surface of the main steel beam by welding.

6. The detachable and reusable support pile top steel structure cap beam support system according to claim 1, characterized in that, The ends of two adjacent steel structure cap beams are connected by connecting plates and high-strength bolts.

7. The detachable and reusable support pile top steel structure cap beam support system according to claim 1, characterized in that, When the support piles are double-row support piles, it also includes a steel structure connecting beam that connects the tops of the two rows of support piles to the steel structure cap beam. The two ends of the steel structure connecting beam are detachably and fixedly connected to the steel structure cap beam.

8. The detachable and reusable support pile top steel structure cap beam support system according to claim 7, characterized in that, The steel structure connecting beam is a steel component, and the connection point between the steel structure connecting beam and the steel structure cap beam is located at the vertical stiffening rib of the steel structure cap beam or on a specially designed connecting end plate.

9. A construction method for a detachable and reusable support pile top steel structure cap beam support system as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Prefabricate the steel structure cap beam in the factory; S2. Anchor cables are pre-embedded and installed in the steel cage of the support pile, and then concrete is poured to form the support pile. S3. Chisel the pile heads of the support piles down to the design elevation, and measure and set out the installation position of the steel structure cap beam; S4. Hoist each section of the steel structure cap beam to the top of the support pile and position it so that the anchor cable pre-embedded at the top of the support pile passes through the anchor cable connection assembly on the steel structure cap beam. S5. Install anchorages at the upper end of the anchor cables and tension and lock them to connect the steel structure cap beam and the support piles into one unit; S6. High-strength bolts are used to connect and fix adjacent sections of the steel structure cap beam.

10. The construction method of the detachable and reusable support pile top steel structure cap beam support system according to claim 9, characterized in that, When the support piles are double-row support piles, steel structure connecting beams are prefabricated in the factory at the same time; after the steel structure cap beams on the top of the two rows of support piles are installed, multiple steel structure connecting beams are connected and fixed between the steel structure cap beams on the top of the two rows of support piles.

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