H-shaped UHPC pile and hollow dumbbell-shaped UHPC pile combined supporting structure and construction method

Abstract

The invention relates to the technical field of port protection embankments and foundation pit engineering supporting, and particularly discloses a combined supporting structure of H-shaped UHPC piles and hollow dumbbell-shaped UHPC piles, which comprises a plurality of H-shaped UHPC piles arranged on the periphery of a port protection embankment or a foundation pit at intervals, and a hollow dumbbell-shaped UHPC pile is arranged between every two adjacent H-shaped UHPC piles. The top of the H-shaped UHPC pile and the top of the hollow dumbbell-shaped UHPC pile are connected with a top beam. The combined supporting structure of the H-shaped UHPC piles and the hollow dumbbell-shaped UHPC piles has the advantages of being high in construction efficiency, low in manufacturing cost, good in stability and corrosion resistance and good in water stopping performance.

Description

Technical Field

[0001] The invention relates to the technical field of port protection embankments and foundation pit engineering support, and specifically to a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles and a construction method. Background Art

[0002] In port protection dikes, foundation pit projects and other civil engineering projects, the design and construction of support structures are key links to ensure the safety and stability of the project. Although traditional support structures such as steel sheet piles, concrete piles and underground continuous walls have achieved certain results in practical applications, they still have some shortcomings. Their construction efficiency is low, the cost is high, the durability and corrosion resistance are insufficient, and the water-stopping effect is poor under complex hydrological conditions. In recent years, the introduction of ultra-high performance concrete (UHPC) has improved these problems to some extent. UHPC has high strength, high toughness and extremely low permeability, which can significantly improve the performance of support structures. However, relying solely on UHPC materials is not enough to comprehensively solve all problems. Therefore, combining different types of pile foundation structures to optimize the construction process to reduce costs and improve overall performance has become the focus of current research.

[0003] In summary, the current support methods for port embankments and foundation pit projects have many deficiencies. In practical applications, although traditional support structures such as steel sheet piles, concrete piles and underground continuous walls have certain support effects, they also have some obvious defects. First, these traditional structures have low construction efficiency and high costs, and in some special environments, their durability and corrosion resistance are insufficient. In addition, under complex hydrological conditions, the water-stopping effect is often unsatisfactory. In order to overcome these limitations and provide a more efficient, economical and high-performance support method, a combined support structure and construction method of H-type UHPC piles and hollow dumbbell-type UHPC piles are provided. Summary of the invention

[0004] The purpose of the present invention is to provide a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles and a construction method to solve the problems raised by the above-mentioned background technology in view of the defects of the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles, comprising a plurality of H-type UHPC piles arranged at intervals around a port protection dike or a foundation pit, a hollow dumbbell-type UHPC pile is arranged between two adjacent H-type UHPC piles, and a crown beam is connected to the top of the H-type UHPC pile and the top of the hollow dumbbell-type UHPC pile.

[0006] Furthermore, an H-type UHPC pile gasket is provided on the top of the H-type UHPC pile, and a hollow dumbbell-type pile gasket is provided on the top of the hollow dumbbell-type UHPC pile to prevent damage to the pile head during hammering;

[0007] The H-type UHPC pile gasket is connected to the H-type steel cushion layer by bolts; the H-type UHPC pile gasket is provided with a threaded hole for later recovery of the H-type UHPC pile;

[0008] The hollow dumbbell-shaped pile gasket is connected to the dumbbell-shaped steel cushion layer by bolts.

[0009] Furthermore, a slurry containing silty clay and a curing agent is injected into the hollow dumbbell-shaped UHPC pile, and the H-shaped UHPC pile and the hollow dumbbell-shaped UHPC pile form an underground continuous wall.

[0010] Furthermore, an inner support is provided between the two H-shaped UHPC piles, and both ends of the inner support are supported on the H-shaped UHPC piles.

[0011] Furthermore, the H-type UHPC pile and the hollow dumbbell-type UHPC pile are both made of ultra-high performance concrete UHPC.

[0012] A construction method of a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles, using a one-by-one construction method, the specific steps are as follows:

[0013] Step 1: H-type UHPC pile construction;

[0014] In the construction area, the position of each H-type UHPC pile is first accurately determined to ensure accurate installation. The first H-type UHPC pile is driven into the ground using hammering or static pressure to ensure its stability and verticality. In order to prevent damage to the pile head during the hammering process, a gasket is added to the upper part of the pile head and connected to the hammering cushion layer through a nut.

[0015] Step 2: Construction of hollow dumbbell-shaped UHPC piles;

[0016] After the first H-type UHPC pile is in place, a hollow dumbbell-type UHPC pile is immediately constructed at the adjacent predetermined position;

[0017] Use static pressure or hammering to drive the hollow dumbbell UHPC piles into the ground to ensure a continuous structure with the constructed H-type piles;

[0018] Step 3: Repeat the construction;

[0019] Repeat the above steps to construct the next H-type UHPC pile and hollow dumbbell-type UHPC pile in sequence until the entire support structure is completed;

[0020] Step 4: Grouting operation;

[0021] After the hollow dumbbell-shaped UHPC pile is in place, slurry is injected through the reserved hole. The slurry consists of silty clay and curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile.

[0022] Step 5: Connect the crown beam;

[0023] Cast cap beams on the top of all H-type UHPC piles and hollow dumbbell-type UHPC piles to ensure that they form an integrated load-bearing structure with the pile body; the cap beams are made of high-strength concrete to increase structural stability;

[0024] Step 6: Internal support or anchor support and waterproof sealing;

[0025] Set up internal supports or anchor rods according to engineering design requirements. Commonly used materials are anchor rods, steel supports or concrete supports.

[0026] A waterproof sealing material is arranged between the crown beam and the pile body to enhance the waterproof performance of the structure.

[0027] A construction method for a combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile, the specific steps are as follows: a step-by-step construction method is adopted, the specific steps are as follows:

[0028] Step 1: Construction of the entire H-type UHPC pile;

[0029] Determine the positions of all H-type UHPC piles in the construction area, and drive all H-type UHPC piles and hollow dumbbell-type UHPC piles into the ground in sequence by hammering or static pressure to form a preliminary support framework; install gaskets and hammer pads on the tops of H-type UHPC piles and hollow dumbbell-type UHPC piles to prevent damage;

[0030] Step 2: Construction of the entire hollow dumbbell-shaped UHPC pile;

[0031] After the H-type UHPC pile construction is completed, start inserting hollow dumbbell-type UHPC piles between adjacent piles and drive them into the ground using hammering or static pressure to ensure a tight fit;

[0032] Step 4: Grouting operation;

[0033] After the hollow dumbbell-shaped UHPC pile is in place, slurry is injected through the reserved hole. The slurry consists of silty clay and curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile.

[0034] Step 5: Connect the crown beam;

[0035] Cast cap beams on the top of all H-type UHPC piles and hollow dumbbell-type UHPC piles to ensure that they form an integral load-bearing structure with the pile body; the cap beams are made of high-strength concrete to increase structural stability;

[0036] Step 6: Internal support or anchor support and waterproof sealing;

[0037] Internal supports or anchor rods are set according to engineering design requirements. Commonly used materials are anchor rods or steel supports or concrete supports. Waterproof sealing materials are set between the crown beam and the pile body to enhance the waterproof performance of the structure.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. Structural innovation and environmental benefits: The support structure of the present invention includes H-type UHPC piles arranged at intervals around the foundation pit, and hollow dumbbell-type UHPC piles are arranged between adjacent piles. Slurry containing muddy clay and curing agent is injected into the dumbbell-type piles, and the density of grouting is improved by utilizing waste, which not only enhances the stability of the pile body, but also improves environmental benefits.

[0040] 2. Innovative design details: A gasket is added to the upper part of the prefabricated H-type UHPC pile to prevent damage to the pile head during hammering. A hammering cushion layer for the upper part of the H-type UHPC pile is invented, and the hammer head evenly applies force to the gasket on the pile head through the cushion layer. The upper part of the H-type UHPC pile gasket is connected to the cushion layer through a nut to ensure construction safety and effectiveness. (The same applies to hollow dumbbell-type UHPC piles). A threaded hole is reserved on the upper part of the H-type UHPC pile gasket to facilitate the later recycling of the H-type UHPC pile, further improving economic and environmental benefits.

[0041] 3. Simplified construction and flexible connection: The connection between H-type UHPC piles and hollow dumbbell-type UHPC piles is flexible and can be welded or bolted to ensure the overall stability of the structure. The top of the pile is connected by a crown beam, and the crown beam casting and pile grouting can be carried out simultaneously during construction, which greatly simplifies the construction process.

[0042] 4. Enhance the strength and durability of the surface layer: The steel mesh sprayed concrete surface layer is configured inside the foundation pit to strengthen the strength and stability of the side walls of the foundation pit. Steel fiber or glass fiber is added to the concrete to improve the strength and durability of the surface layer.

[0043] 5. Economical and efficient: This structural system allows for an appropriate increase in the distance between piles and a reduction in the number of piles, thereby reducing material and construction costs, shortening the construction period, significantly saving project costs, and improving construction efficiency.

[0044] 6. Adaptability and durability: The present invention is particularly suitable for foundation pit support and port protection dike projects under complex hydrological conditions. It has excellent durability, corrosion resistance and water-stopping effects, and is widely applicable to a variety of foundation pit and port protection dike projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a three-dimensional schematic diagram of the foundation pit support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles;

[0046] Figure 1 Markings: 1. Crown beam, 2. Steel mesh sprayed concrete surface layer, 3. H-type UHPC pile, 4. Hollow dumbbell-shaped UHPC pile, 5. Muddy clay and curing agent; 6. Anchor rod; 7. Internal support;

[0047] Figure 2 (a) is a front view of the support structure system of the H-type UHPC pile and the hollow grouting dumbbell-type UHPC pile described in Example 1 of the present invention;

[0048] Figure 2 (b) is a three-dimensional schematic diagram of the H-type UHPC pile and the hollow dumbbell-type UHPC pile described in Example 1 of the present invention.

[0049] Figure 2 (c) is a dimension diagram of the H-type UHPC pile according to Example 1 of the present invention;

[0050] Figure 2 (d) is a dimension diagram of the dumbbell-shaped UHPC pile according to Example 1 of the present invention;

[0051] Figure 2 Markings: h - height of H-type UHPC pile, b - total width of horizontal flange of H-type UHPC pile section, t1 - thickness of flange tail of H-type UHPC pile refers to the thickness of the outermost end of flange, t2 - thickness of middle vertical part (web) of H-type UHPC pile, L1 - length of H-type UHPC pile and hollow dumbbell UHPC pile, t3 - thickness of hollow dumbbell pile.

[0052] Figure 3 It is a schematic diagram of an H-shaped UHPC pile gasket and an H-shaped steel cushion layer of the present invention;

[0053] Figure 3 Markings: 8. Combination of H-type UHPC pile with gasket on the pile top and H-type steel cushion; 9. H-type UHPC pile with gasket on the pile top; 10. H-type UHPC pile gasket; 11. H-type steel cushion.

[0054] Figure 4 It is a schematic diagram of a hollow dumbbell pile gasket and a dumbbell steel cushion;

[0055] Figure 4Markings: 12. Combination of a hollow dumbbell-shaped pile with a gasket on the pile top and a dumbbell-shaped steel cushion; 13. A hollow dumbbell-shaped pile with a gasket on the pile top; 14. A hollow dumbbell-shaped pile gasket; 15. A dumbbell-shaped steel cushion. DETAILED DESCRIPTION

[0056] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0057] The present invention proposes a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles and a construction method thereof. The support structure effectively combines the advantages of modern material science and engineering design and is suitable for foundation pit and port protection embankment construction under complex geological and hydrological conditions.

[0058] The innovation of this composite support structure lies in the use of UHPC material, which is an ultra-high performance concrete with high strength, high toughness and extremely low permeability. By combining H-type UHPC piles with hollow dumbbell-type UHPC piles and supplemented by special grouting technology, the density and stability of the overall structure are improved. At the same time, this method simplifies the construction process and reduces the dependence on large-sized cast-in-place piles, thereby reducing material and construction costs.

[0059] The combined support structure of the H-type UHPC pile and the hollow dumbbell-type UHPC pile of the present invention not only has good construction performance and economic benefits, but also its excellent durability and anti-corrosion properties significantly improve the safety and service life of the project, especially in an environment with abundant groundwater, showing an excellent water-stopping effect. This innovative design and construction method provides a safer, more efficient and economical support option for port and foundation pit projects.

[0060] Embodiment 1: A combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile, specifically comprising a plurality of H-type UHPC piles 3 arranged at intervals around a port protection dike or a foundation pit, a hollow dumbbell-type UHPC pile 4 being arranged between two adjacent H-type UHPC piles 3, and a crown beam 1 being connected to the top of the H-type UHPC pile 3 and the top of the hollow dumbbell-type UHPC pile 4.

[0061] An H-type UHPC pile gasket 10 is provided on the top of the H-type UHPC pile 3, and a hollow dumbbell-type pile gasket 14 is provided on the top of the hollow dumbbell-type UHPC pile 4 to prevent damage to the pile head during the hammering process;

[0062] The H-type UHPC pile gasket 10 is connected to the H-type steel cushion layer 11 by bolts; a threaded hole is provided on the H-type UHPC pile gasket 10 for later recovery of the H-type UHPC pile 3;

[0063] The hollow dumbbell-shaped pile gasket 14 is connected to the dumbbell-shaped steel cushion layer 15 by bolts.

[0064] The hollow dumbbell-shaped UHPC pile 4 is injected with slurry containing muddy clay and curing agent, and high-strength, low-permeability grouting materials are used to further enhance the integrity and water-stopping effect of the support structure. The muddy clay and curing agent used not only achieve waste utilization, but also improve environmental protection benefits; the H-shaped UHPC pile 3 and the hollow dumbbell-shaped UHPC pile 4 form an underground continuous wall; the H-shaped UHPC pile 3 has strong compressive and anti-corrosion capabilities. This combined structure significantly improves the water-stopping performance of the foundation pit, which is particularly suitable for situations with more groundwater;

[0065] An inner support 7 is provided between the two H-shaped UHPC piles 3 , and both ends of the inner support 7 are supported on the H-shaped UHPC piles 3 , thereby ensuring the stability and bearing capacity of the overall structure.

[0066] The H-type UHPC pile 3 and the hollow dumbbell-type UHPC pile 4 are both made of ultra-high performance concrete UHPC, which has excellent durability and corrosion resistance.

[0067] A construction method of a combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles, using a one-by-one construction method, the specific steps are as follows:

[0068] Step 1: Construction of H-type UHPC pile 3;

[0069] In the construction area, the position of each H-type UHPC pile 3 is first accurately determined to ensure accurate installation. The first H-type UHPC pile 3 is driven into the ground by hammering or static pressure to ensure its stability and verticality. In order to prevent damage to the pile head during the hammering process, a gasket is added to the upper part of the pile head and connected to the hammering cushion layer through a nut.

[0070] Step 2: Construction of hollow dumbbell-shaped UHPC pile 4;

[0071] After the first H-type UHPC pile 3 is in place, a hollow dumbbell-type UHPC pile 4 is immediately constructed at the adjacent predetermined position;

[0072] The hollow dumbbell-shaped UHPC pile 4 is driven into the ground by static pressure or hammering to ensure that a continuous structure is formed with the constructed H-shaped pile;

[0073] Step 3: Repeat the construction;

[0074] Repeat the above steps to construct the next H-type UHPC pile 3 and the hollow dumbbell-type UHPC pile 4 in sequence until the entire support structure is completed;

[0075] Step 4: Grouting operation;

[0076] After the hollow dumbbell-shaped UHPC pile 4 is in place, slurry is injected through the reserved channel, the slurry consisting of silty clay and a curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile 4;

[0077] Step 5: Connect crown beam 1;

[0078] A cap beam 1 is cast on the top of all H-type UHPC piles 3 and hollow dumbbell-type UHPC piles 4 to ensure that the cap beam 1 forms an integral bearing structure with the pile body; the cap beam 1 is made of high-strength concrete to increase structural stability;

[0079] Step 6: Internal support or anchor support and waterproof sealing;

[0080] Set up internal supports or anchor rods according to engineering design requirements. Commonly used materials are anchor rods, steel supports or concrete supports.

[0081] A waterproof sealing material is arranged between the crown beam 1 and the pile body to enhance the waterproof performance of the structure.

[0082] A construction method for a combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile, the specific steps are as follows: a step-by-step construction method is adopted, the specific steps are as follows:

[0083] Step 1: Construction of the entire section of H-type UHPC pile 3;

[0084] Determine the positions of all H-type UHPC piles 3 in the construction area, and drive all H-type UHPC piles 3 and hollow dumbbell-type UHPC piles 4 into the ground in sequence by hammering or static pressure method to form a preliminary support frame; install gaskets and hammer pads on the tops of the H-type UHPC piles 3 and hollow dumbbell-type UHPC piles 4 to prevent damage;

[0085] Step 2: Construction of the entire section of hollow dumbbell-shaped UHPC pile 4;

[0086] After the construction of the H-type UHPC piles 3 is completed, the hollow dumbbell-type UHPC piles 4 are inserted between the adjacent piles and driven into the ground by hammering or static pressure to ensure a tight fit;

[0087] Step 4: Grouting operation;

[0088] After the hollow dumbbell-shaped UHPC pile 4 is in place, slurry is injected through the reserved channel, the slurry consisting of silty clay and a curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile 4;

[0089] Step 5: Connect crown beam 1;

[0090] A cap beam 1 is cast on the top of all H-type UHPC piles 3 and hollow dumbbell-type UHPC piles 4 to ensure that the cap beam 1 forms an integral bearing structure with the pile body; the cap beam 1 is made of high-strength concrete to increase structural stability;

[0091] Step 6: Internal support or anchor support and waterproof sealing;

[0092] According to the engineering design requirements, internal supports or anchor rods are set, and commonly used materials are anchor rods or steel supports or concrete supports; waterproof sealing materials are set between the crown beam 1 and the pile body to enhance the waterproof performance of the structure.

[0093] Embodiment 2: A construction method of a combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile; the specific steps are as follows:

[0094] Step 1: Determine the pile position and construct the H-type UHPC pile;

[0095] First, determine the pile position around the port protection embankment or foundation pit; use measurement equipment to accurately calibrate the installation position of the H-type UHPC pile; H-type UHPC piles are made of ultra-high performance concrete (UHPC) and have excellent compressive strength and corrosion resistance; statically press or hammer the H-type UHPC piles into the ground one by one to form a preliminary support structure; the spacing of the H-type UHPC piles is set according to the engineering design requirements, usually at an interval of 1.5-2 meters;

[0096] Step 2: Construction of hollow dumbbell-shaped UHPC piles;

[0097] Construct hollow dumbbell-shaped UHPC piles between two adjacent H-shaped UHPC piles; the hollow dumbbell-shaped UHPC piles are also made of ultra-high performance concrete (UHPC), and are characterized by a hollow structure inside, which is convenient for subsequent grouting operations; the hollow dumbbell-shaped UHPC piles are driven into the ground using the static pressure method or the hammer method to ensure that they form a continuous support structure with the H-shaped UHPC piles; the length of the hollow dumbbell-shaped UHPC piles is set according to the engineering design requirements, and is usually 5-20 meters long;

[0098] Step 3: injecting muddy clay and curing agent slurry;

[0099] After the hollow dumbbell-shaped UHPC pile is driven into the ground, a slurry containing silty clay and a curing agent is injected into the pile through the reserved grouting port; this slurry can not only improve the density and stability of the pile body, but also realize waste utilization and enhance environmental benefits; during the grouting process, ensure that the slurry is evenly distributed inside the hollow dumbbell-shaped UHPC pile, fill the gaps, and enhance the integrity of the support structure;

[0100] Step 4: Connect the crown beam;

[0101] A cap beam is installed on the top of the H-type UHPC pile and the hollow dumbbell-type UHPC pile. The cap beam is cast with high-strength concrete to make it tightly connected with the pile and the dumbbell-type pile to form an integral support structure. The width and thickness of the cap beam are set according to the engineering design requirements, usually with a width of 500-800 mm and a thickness of 300-500 mm. The setting of the cap beam not only enhances the overall stability of the structure, but also provides good bearing capacity.

[0102] Step 5: Set up internal support and waterproof sealing materials;

[0103] Internal supports are set inside the combined support structure according to the specific conditions of the foundation pit project. The internal supports can be reinforced concrete supports or steel supports to ensure the stability and bearing capacity of the internal and external structures. Waterproof sealing materials are set between the crown beam and the H-type UHPC piles and hollow dumbbell-type UHPC piles to further enhance the waterproof performance of the structure and ensure its reliability under complex hydrological conditions.

[0104] Step 6: Construction operations in the foundation pit;

[0105] The steel mesh is laid in the foundation pit and the concrete surface layer is sprayed to enhance stability and waterproofness. The concrete surface layer is sprayed with a steel mesh with a thickness of 80-200 mm, a steel bar diameter of 6 mm, and a spacing of 150 mm x 150 mm. Accelerators and steel fibers or glass fibers can be added to ensure rapid setting and high strength of the concrete.

[0106] Step 7: Set up other supporting structures according to actual conditions;

[0107] According to the actual situation on site, structures such as concrete supports, anchor rods, steel supports and steel purlins can be set up to further enhance the stability and safety of the foundation pit; these additional support structures are specifically designed and constructed according to project needs to ensure that the overall support system achieves the best effect.

[0108] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A combined support structure of H-type UHPC piles and hollow dumbbell-type UHPC piles, characterized in that: The invention comprises a plurality of H-shaped UHPC piles (3) arranged at intervals around a port protection dike or a foundation pit, a hollow dumbbell-shaped UHPC pile (4) being arranged between two adjacent H-shaped UHPC piles (3), and a cap beam (1) being connected to the top of the H-shaped UHPC pile (3) and the top of the hollow dumbbell-shaped UHPC pile (4).

2. The combined support structure of the H-type UHPC pile and the hollow dumbbell-type UHPC pile according to claim 1 is characterized in that: An H-type UHPC pile gasket (10) is provided on the top of the H-type UHPC pile (3), and a hollow dumbbell-type pile gasket (14) is provided on the top of the hollow dumbbell-type UHPC pile (4), for preventing the pile head from being damaged during the hammering process; The H-type UHPC pile gasket (10) is connected to the H-type steel cushion layer (11) by bolts; the H-type UHPC pile gasket (10) is provided with a threaded hole for later recovery of the H-type UHPC pile (3); The hollow dumbbell-shaped pile gasket (14) is connected to the dumbbell-shaped steel cushion layer (15) by bolts.

3. The combined support structure of the H-type UHPC pile and the hollow dumbbell-type UHPC pile according to claim 2 is characterized in that: Slurry containing muddy clay and a curing agent is injected into the hollow dumbbell-shaped UHPC pile (4); the H-shaped UHPC pile (3) and the hollow dumbbell-shaped UHPC pile (4) form an underground continuous wall.

4. The combined support structure of the H-type UHPC pile and the hollow dumbbell-type UHPC pile according to claim 1 is characterized in that: An inner support (7) is arranged between two H-shaped UHPC piles (3), and two ends of the inner support (7) are supported on the H-shaped UHPC piles (3).

5. The combined support structure of the H-type UHPC pile and the hollow dumbbell-type UHPC pile according to claim 1 is characterized in that: The H-shaped UHPC pile (3) and the hollow dumbbell-shaped UHPC pile (4) are both made of ultra-high performance concrete (UHPC).

6. A construction method for a combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile according to any one of claims 1 to 5, characterized in that: Adopt the construction method one by one, the specific steps are as follows: Step 1: Construction of H-type UHPC piles (3); In the construction area, firstly, the position of each H-type UHPC pile (3) is accurately determined to ensure accurate installation, and the first H-type UHPC pile (3) is driven into the ground by hammering or static pressure method to ensure its stability and verticality; in order to prevent damage to the pile head during the hammering process, a gasket is added to the upper part of the pile head, and the hammering cushion layer is connected by a nut; Step 2: Construction of hollow dumbbell-shaped UHPC piles (4); After the first H-shaped UHPC pile (3) is in place, a hollow dumbbell-shaped UHPC pile (4) is immediately constructed at a predetermined position adjacent thereto; The hollow dumbbell-shaped UHPC pile (4) is driven into the ground by static pressure or hammering to ensure that a continuous structure is formed with the constructed H-shaped pile; Step 3: Repeat the construction; Repeat the above steps to construct the next H-type UHPC pile (3) and the hollow dumbbell-type UHPC pile (4) in sequence until the entire support structure is completed; Step 4: Grouting operation; After the hollow dumbbell-shaped UHPC pile (4) is in place, a slurry is injected through the reserved hole, the slurry consisting of silty clay and a curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile (4); Step 5: Connect the crown beam (1); A cap beam (1) is cast on the top of all H-type UHPC piles (3) and hollow dumbbell-type UHPC piles (4) to ensure that the cap beam (1) forms an integral bearing structure with the pile body; the cap beam (1) is made of high-strength concrete to increase structural stability; Step 6: Internal support or anchor support and waterproof sealing; Set up internal supports or anchor rods according to engineering design requirements. Commonly used materials are anchor rods, steel supports or concrete supports. A waterproof sealing material is arranged between the crown beam (1) and the pile body to enhance the waterproof performance of the structure.

7. A construction method for a combined support structure of an H-type UHPC pile and a hollow dumbbell-type UHPC pile according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: Using the step-by-step construction method, the specific steps are as follows: Step 1: Construction of the entire H-type UHPC pile (3); Determine the positions of all H-type UHPC piles (3) in the construction area, and drive all H-type UHPC piles (3) and hollow dumbbell-type UHPC piles (4) into the ground in sequence by hammering or static pressure to form a preliminary support frame; install gaskets and hammering pads on the tops of the H-type UHPC piles (3) and the hollow dumbbell-type UHPC piles (4) to prevent damage; Step 2: Full-section construction of hollow dumbbell-shaped UHPC piles (4); After the construction of the H-type UHPC piles (3) is completed, hollow dumbbell-type UHPC piles (4) are inserted between adjacent piles and driven into the ground by hammering or static pressure to ensure a tight fit; Step 4: Grouting operation; After the hollow dumbbell-shaped UHPC pile (4) is in place, a slurry is injected through the reserved hole, the slurry consisting of silty clay and a curing agent to improve the density and integrity of the hollow dumbbell-shaped UHPC pile (4); Step 5: Connect the crown beam (1); A cap beam (1) is cast on the top of all H-type UHPC piles (3) and hollow dumbbell-type UHPC piles (4) to ensure that the cap beam (1) forms an integral bearing structure with the pile body; the cap beam (1) is made of high-strength concrete to increase structural stability; Step 6: Internal support or anchor support and waterproof sealing; An internal support or anchor rod is provided according to the engineering design requirements. Commonly used materials are anchor rod or steel support or concrete support. A waterproof sealing material is provided between the crown beam (1) and the pile body to enhance the waterproof performance of the structure.

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