A type of four-corner frame steel-concrete composite high-pile foundation

Abstract

This invention discloses a four-corner frame steel-concrete composite high-pile foundation, comprising: a concrete foundation; a high-pile foundation; the high-pile foundation includes a steel-concrete pipe cylinder and column-type scaffolding cylinders; the steel-concrete pipe cylinder and the column-type scaffolding cylinders are positioned above the concrete foundation and connected to it respectively; there are multiple column-type scaffolding cylinders, each connected to the steel-concrete pipe cylinder via inclined steel pipes; and piles are positioned below the concrete foundation; the first end of each pile is embedded in the concrete foundation, and the second end is embedded in the bedrock. The four-corner frame steel-concrete composite high-pile foundation provided by this invention, by setting multiple column-type scaffolding cylinders and connecting each column-type scaffolding cylinder to the steel-concrete pipe cylinder via inclined steel pipes, distributes the horizontal load on the steel-concrete pipe cylinder to the column-type scaffolding cylinders, avoiding cracking at the interface between the steel-concrete pipe cylinder and the concrete foundation, thereby improving the reliability of the foundation.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and more specifically, to a four-corner frame steel-concrete composite high pile foundation. Background Technology

[0002] Currently, we have extensive experience in the construction of pile group foundations for bridges and port terminals. As a result, we have proposed a pile group foundation design scheme for offshore wind farm construction. This can effectively reduce the diameter of the pile foundation. At the same time, pile group foundations have high structural rigidity, controllable pile driving accuracy, and low cost, making them suitable for offshore wind turbine foundations with anti-collision requirements.

[0003] In existing technologies, the pile foundation used for wind turbine towers mainly consists of piles and a pile cap. The piles are usually steel pipe piles, and the pile cap is a cast-in-place reinforced concrete structure. This type of foundation structure has the characteristics of high rigidity and good integrity. However, the connection between the pile cap concrete and the tower is relatively weak. Under strong wind loads, the connection between the tower and the pile cap concrete is prone to cracking, resulting in low reliability of the pile cap foundation and significant safety hazards.

[0004] In addition, the existing foundation caps have a large structural weight and require a large number of piles, resulting in a large volume of cast-in-place concrete for the foundation caps and thus a high cost.

[0005] Therefore, how to improve the reliability of the pile cap foundation has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a four-corner frame steel-concrete composite high pile foundation to improve the reliability of the foundation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A four-corner frame steel-concrete composite high-pile foundation includes:

[0009] Foundation concrete;

[0010] A high pile cap; the high pile cap includes a steel pipe concrete cylinder and a column-type scaffold cylinder; the steel pipe concrete cylinder and the column-type scaffold cylinder are disposed above the pile cap concrete, and the steel pipe concrete cylinder and the column-type scaffold cylinder are respectively connected to the pile cap concrete; there are multiple column-type scaffold cylinders, and each column-type scaffold cylinder is respectively connected to the steel pipe concrete cylinder through an inclined steel pipe.

[0011] A pile foundation is provided below the concrete cap; the first end of the pile foundation is embedded in the concrete cap, and the second end of the pile foundation is embedded in the rock strata, so that the pile foundation provides stable support for the concrete cap.

[0012] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the steel pipe concrete cylinder includes an inner steel pipe and an outer steel pipe sleeved on the inner steel pipe; a cavity is formed between the inner steel pipe and the outer steel pipe; and a layer of concrete is provided in the cavity.

[0013] Optionally, in the above-mentioned four-corner frame steel-concrete composite high-pile foundation, a rigid flange is provided at the first end of the steel pipe concrete cylinder, the inner diameter of the rigid flange being equal to the inner diameter of the inner steel pipe, and the rigid flange being used to connect to the upper tower cylinder; a first rectangular stiffening rib is provided at the second end of the steel pipe concrete cylinder, the first rectangular stiffening rib being embedded in the foundation concrete; a circumferential stiffening rib is provided in the horizontal direction of the first rectangular stiffening rib; the circumferential stiffening rib is connected to the outer steel pipe by welding.

[0014] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the rigid flange is provided with multiple flange connection holes; the bottom of the rigid flange is provided with angular stiffening ribs, and the rigid flange is connected to the outer steel pipe through the angular stiffening ribs.

[0015] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the column-type scaffolding tube includes a steel pipe; the steel pipe is filled with solid concrete; a second rectangular stiffening rib is provided at the bottom of the column-type scaffolding tube, the second rectangular stiffening rib is embedded in the foundation concrete; and circumferential reinforcing bars are provided in the horizontal direction of the second rectangular stiffening rib.

[0016] Optionally, in the above-mentioned four-corner frame steel-concrete composite high-pile foundation, the thickness of the first rectangular stiffening rib is 30mm to 50mm; and / or,

[0017] The thickness of the second rectangular stiffening rib is 30mm to 50mm; and / or,

[0018] The height of the column-type scaffold cylinder is 3000mm to 4500mm; and / or,

[0019] The diameter of the circumferential reinforcing bars is 20mm to 28mm; and / or,

[0020] The inner diameter of the inclined steel pipe is 600mm to 1000mm; and / or,

[0021] The thickness of the inclined steel pipe is 40mm to 50mm.

[0022] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the pile cap concrete includes pile top pile cap concrete and post-cast concrete; short steel bars are embedded in the pile top pile cap concrete; the post-cast concrete is located above the pile top pile cap concrete, and the pile top pile cap concrete is connected to the post-cast concrete through the short steel bars.

[0023] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the short steel bars are distributed in a ring on the concrete of the pile top foundation.

[0024] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the pile foundation includes an outer steel pipe and reinforced concrete; the outer steel pipe is sleeved on the outside of the reinforced concrete and is in contact with the reinforced concrete; the first end of the outer steel pipe is embedded in the concrete of the pile top cap, and the second end of the outer steel pipe is embedded in the rock stratum.

[0025] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the reinforced concrete includes a steel reinforcement cage and concrete; the first end of the steel reinforcement cage is embedded in the concrete of the pile top foundation, and the second end of the steel reinforcement cage is embedded in the rock stratum.

[0026] Optionally, in the above-mentioned four-corner frame steel-concrete composite high pile foundation, the steel reinforcement cage includes main steel bars; multiple spiral stirrups are provided on the outside of the main steel bars, and the spiral stirrups are evenly distributed along the length direction of the main steel bars.

[0027] Optionally, in the above-mentioned four-corner frame steel-concrete composite high-pile foundation, the spacing of each of the spiral stirrups is 100mm to 200mm; and / or,

[0028] The diameter of the main reinforcing bar is 18mm to 28mm; and / or,

[0029] The wall thickness of the outer steel pipe of the pile foundation is d, and d > 20 mm; and / or,

[0030] The second end of the outer steel pipe of the pile foundation is embedded in the rock stratum to a depth of h, where h > 1000 mm; and / or,

[0031] The diameter of the short reinforcing bars is 20mm to 24mm; and / or,

[0032] The short reinforcing bars are 250mm to 300mm in length; and / or,

[0033] The length of the pile foundation is 25m to 40m.

[0034] The present invention provides a four-corner frame steel-concrete composite high-pile foundation, in which a high-pile foundation is set above the concrete foundation, and piles are set below the concrete foundation. The first end of the pile is embedded in the concrete foundation, and the second end of the pile is embedded in the rock strata, so that the piles provide stable support for the concrete foundation. The high-pile foundation includes a steel-concrete pipe cylinder and column-type scaffolding cylinders, both of which are connected to the concrete foundation. Multiple column-type scaffolding cylinders are connected to the steel-concrete pipe cylinder via inclined steel pipes, distributing the horizontal load on the steel-concrete pipe cylinder to the column-type scaffolding cylinders. This avoids stress concentration at the interface between the steel-concrete pipe cylinder and the concrete foundation, effectively preventing cracking at the interface and improving the overall stability of the high-pile foundation.

[0035] Compared with the prior art, the four-corner frame steel-concrete composite high pile foundation provided by the present invention, by setting up multiple column-type scaffolding tubes, and each column-type scaffolding tube is connected to the steel-concrete tube via inclined steel pipes, distributes the horizontal load on the steel-concrete tube to the column-type scaffolding tube, avoids stress concentration at the interface between the steel-concrete tube and the foundation concrete, effectively avoids cracking at the interface between the steel-concrete tube and the foundation concrete, and thus improves the reliability of the foundation. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0037] Figure 1 This is an axonometric view of a four-corner frame steel-concrete composite high pile cap foundation provided in an embodiment of the present invention;

[0038] Figure 2 This is a front view of the four-corner frame steel-concrete composite high pile foundation provided in an embodiment of the present invention;

[0039] Figure 3 This is a structural schematic diagram of a four-corner frame steel-concrete composite high pile cap provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the rigid flange provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the connection between the steel-concrete composite pile foundation and the concrete cap provided in an embodiment of the present invention;

[0042] Figure 6This is a schematic diagram of the connection between the concrete of the top cap of the pile foundation and the post-cast concrete provided in an embodiment of the present invention;

[0043] Figure 7 This is a top view of the connection between the concrete of the top pile cap and the post-cast concrete provided in an embodiment of the present invention.

[0044] Wherein, 1 represents the pile foundation, 100 represents the outer steel pipe of the pile foundation, 101 represents reinforced concrete, 1011 represents the steel reinforcement cage, 1012 represents concrete, 1013 represents the first end, 1014 represents the second end, 1015 represents the main reinforcement, 1016 represents the spiral stirrups, 2 represents the high pile cap, 201 represents the steel-concrete composite cylinder, 2011 represents the first rectangular stiffening rib, 2012 represents the circumferential stiffening rib, 2013 represents the inner steel pipe, and 2014 represents the outer... Steel pipe, 2015 is sandwiched concrete, 202 is column scaffolding tube, 2021 is second rectangular stiffening rib, 2022 is circumferential reinforcement, 2023 is steel pipe, 2024 is solid concrete, 203 is inclined steel pipe, 204 is rigid flange, 2041 is angular stiffening rib, 2042 is flange connection hole, 3 is pile cap concrete, 301 is pile top pile cap concrete, 302 is post-cast concrete, and 303 is short reinforcement. Detailed Implementation

[0045] The core of this invention is to provide a four-corner frame steel-concrete composite high pile foundation to improve the reliability of the foundation.

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] like Figure 1 and Figure 2 As shown in the figure, this embodiment of the invention discloses a four-corner frame steel-concrete composite high-pile foundation, including a concrete foundation 3, a high-pile foundation 2, and pile foundation 1. It should be noted that this embodiment of the invention is explained and described specifically for high-pile foundations; unless otherwise specified below, "foundation" refers to a high-pile foundation.

[0048] The high-pile cap 2 includes a steel-concrete composite cylinder 201 and a column-type scaffolding cylinder 202. The steel-concrete composite cylinder 201 and the column-type scaffolding cylinder 202 are positioned above the cap concrete 3 and are connected to the cap concrete 3. Specifically, there are multiple column-type scaffolding cylinders 202, and each column-type scaffolding cylinder 202 is connected to the steel-concrete composite cylinder 201 via an inclined steel pipe 203. In this embodiment, there are four column-type scaffolding tubes 202, which are evenly distributed around the steel-concrete composite tube 201 and connected to the steel-concrete composite tube 201 through inclined steel pipes 203. This expands the load transfer area from the upper part to the pile foundation 1 and distributes the horizontal load on the steel-concrete composite tube 201 to each column-type scaffolding tube 202. This avoids stress concentration at the interface between the steel-concrete composite tube 201 and the pile cap concrete 3, while improving the overall stability of the high pile cap 2. It effectively avoids cracking at the interface between the steel-concrete composite tube 201 and the pile cap concrete 3, thereby improving the reliability of the pile cap foundation.

[0049] To ensure the uniformity of horizontal load distribution across each column-type scaffolding tube 202, inclined steel pipes 203 are evenly arranged on the outer wall of the steel-concrete composite tube 201, corresponding one-to-one with each column-type scaffolding tube 202. The height of the column-type scaffolding tube 202 is lower than the height of the steel-concrete composite tube 201, so that the inclined steel pipes 203 are inclined from the steel-concrete composite tube 201 towards the column-type scaffolding tube 202, ensuring the uniformity of horizontal load distribution across each column-type scaffolding tube 202, while simultaneously providing stable horizontal support for the steel-concrete composite tube 201.

[0050] The pile foundation 1 is located below the concrete cap 3, with the first end of the pile foundation 1 embedded in the concrete cap 3 and the second end embedded in the rock strata, so that the pile foundation 1 provides stable support for the concrete cap 3. In this embodiment of the invention, the pile foundation adopts a pile group foundation form, which can effectively reduce the accuracy requirements of driving the pile foundation 1 in the sea, and the concrete cap 3 provides a construction platform for the high pile cap 2, facilitating the construction of the superstructure.

[0051] The four-corner frame steel-concrete composite high pile foundation provided by the present invention has a high pile foundation 2 set above the foundation concrete 3 and a pile foundation 1 set below the foundation concrete 3. The first end of the pile foundation 1 is embedded in the foundation concrete 3 and the second end of the pile foundation 1 is embedded in the rock stratum, so that the pile foundation 1 provides stable support for the foundation concrete 3. The high pile cap 2 includes a steel pipe concrete cylinder 201 and a column-type scaffold cylinder 202. The steel pipe concrete cylinder 201 and the column-type scaffold cylinder 202 are respectively connected to the pile cap concrete 3. There are multiple column-type scaffold cylinders 202, and each column-type scaffold cylinder 202 is connected to the steel pipe concrete cylinder 201 through an inclined steel pipe 203. This disperses the horizontal load on the steel pipe concrete cylinder 201 to the column-type scaffold cylinder 202, avoids stress concentration at the interface between the steel pipe concrete cylinder 201 and the pile cap concrete 3, effectively avoids cracking at the interface between the steel pipe concrete cylinder 201 and the pile cap concrete 3, and improves the overall stability of the high pile cap 2.

[0052] Compared with the prior art, the four-corner frame steel-concrete composite high pile foundation provided by the present invention, by setting up multiple column-type scaffolding tubes 202, and each column-type scaffolding tube 202 is connected to the steel pipe concrete tube 201 through inclined steel pipes 203, thereby distributing the horizontal load on the steel pipe concrete tube 201 to the column-type scaffolding tubes 202, avoiding stress concentration at the interface between the steel pipe concrete tube 201 and the foundation concrete 3, effectively avoiding the cracking problem at the connection interface between the steel pipe concrete tube 201 and the foundation concrete 3, thereby improving the reliability of the foundation.

[0053] like Figure 4 As shown, in one specific embodiment, the steel-concrete composite tube 201 includes an inner steel tube 2013 and an outer steel tube 2014 sleeved on the inner steel tube 2013, with the outer steel tube 2014 located outside the inner steel tube 2013, thus forming a cavity between the inner steel tube 2013 and the outer steel tube 2014. A sandwiched concrete 2015 is disposed within this cavity. By adopting a hollow sandwiched structure, the steel-concrete composite tube 201 utilizes the constraint effect of the outer steel tube 2014 and the inner steel tube 2013 on the sandwiched concrete 2015, thereby improving the ultimate compressive bearing capacity of the steel-concrete composite tube 201, while reducing the structural self-weight of the steel-concrete composite tube 201, reducing the amount of cast-in-place concrete 1012, and lowering the cost.

[0054] Furthermore, such as Figure 3 and Figure 4As shown, in a specific embodiment, for ease of understanding, the top end of the steel-concrete composite tube 201 is defined as the first end, and the bottom end of the steel-concrete composite tube 201 is defined as the second end. The first end of the steel-concrete composite tube 201 is provided with a rigid flange 204. The inner diameter of the rigid flange 204 must be equal to the inner diameter of the inner steel tube 2013 to maximize the contact area between the rigid flange 204 and the steel-concrete composite tube 201, thereby ensuring the connection strength between the rigid flange 204 and the steel-concrete composite tube 201. Simultaneously, the rigid flange 204 cuts off the steel-concrete composite tube 201, facilitating a convenient prefabricated connection with the upper tower, reducing on-site wet concrete work 1012, and improving the construction efficiency of the structure. Specifically, the rigid flange 204 has multiple flange connection holes 2042 to facilitate connection to the upper tower. An angular stiffening rib 2041 is provided at the bottom of the rigid flange 204. The rigid flange 204 is connected to the outer steel pipe 2014 through the angular stiffening rib 2041, which increases the rigidity of the rigid flange 204 and avoids the problem of excessive deformation at the connection with the upper tower.

[0055] like Figure 3 As shown, a first rectangular stiffening rib 2011 is provided at the second end of the steel-concrete composite tube 201, and there are multiple first rectangular stiffening ribs 2011. In this embodiment, there are four first rectangular stiffening ribs 2011, which are evenly distributed on the outer wall of the outer steel tube 2014 of the steel-concrete composite tube 201. Each first rectangular stiffening rib 2011 is embedded in the foundation concrete 3 to share the pull-out force generated at the second end of the steel-concrete composite tube 201 under horizontal loads, effectively reducing the risk of cracking at the interface between the steel-concrete composite tube 201 and the foundation concrete 3, and improving the service life of the foundation. A circumferential stiffening rib 2012 is provided in the horizontal direction of each first rectangular stiffening rib 2011, and the circumferential stiffening rib 2012 is connected to the first rectangular stiffening rib 2011 by welding. There are four circumferential stiffening ribs 2012, with two circumferential stiffening ribs 2012 on each side of the first rectangular stiffening rib 2011. The circumferential stiffening ribs 2012 on both sides of the first rectangular stiffening rib 2011 are symmetrically distributed about the first rectangular stiffening rib 2011. Figure 3 As shown, the circumferential stiffening rib 2012 is connected to the outer steel pipe 2014 by welding, providing lateral support for the first rectangular stiffening rib 2011, improving the lateral stiffness of the first rectangular stiffening rib 2011, preventing lateral deformation due to its small thickness, and thus ensuring the strength of the first rectangular stiffening rib 2011. It should be noted that the superstructure includes the upper tower and the steel-concrete composite tube 201.

[0056] like Figure 3As shown, in one specific embodiment, the column scaffolding tube 202 includes a steel pipe 2023, and solid concrete 2024 is poured into the steel pipe 2023 to improve the compressive strength of the column scaffolding tube 202. After the solid concrete 2024 is poured, a steel plate is used to seal the top. The bottom of the column-type scaffolding cylinder 202 is provided with a second rectangular stiffening rib 2021, which is embedded in the foundation concrete 3. There are four second rectangular stiffening ribs 2021, which are evenly distributed on the outer wall of the steel pipe 2023. Circular reinforcing bars 2022 are provided in the horizontal direction of the second rectangular stiffening ribs 2021. In this embodiment, three layers of circular reinforcing bars 2022 are welded to the horizontal direction of the second rectangular stiffening ribs 2021, and the two second rectangular stiffening ribs 2021 are connected by the circular reinforcing bars 2022 so that the four second rectangular stiffening ribs 2021 work together to share the pull-out force generated by the steel pipe concrete cylinder 201 and distributed to the column-type scaffolding cylinder 202.

[0057] It should be noted that by setting a first rectangular stiffening rib 2011 at the second end of the steel pipe concrete cylinder 201 and a second rectangular stiffening rib 2021 at the bottom of the column scaffold cylinder 202, the contact area between the steel pipe concrete cylinder 201 and the column scaffold cylinder 202 and the foundation concrete 3 is increased, thereby improving the overall integrity of the foundation structure.

[0058] Further, in a specific embodiment, the thickness of the first rectangular stiffening rib 2011 is preferably 30mm to 50mm; and / or, the thickness of the second rectangular stiffening rib 2021 is preferably 30mm to 50mm; and / or, the height of the column-type scaffold tube 202 is preferably 3000mm to 4500mm; and / or, the thickness of the steel plate at the top of the column-type scaffold tube 202 is preferably 100mm; and / or, the diameter of the circumferential reinforcing bar 2022 is preferably 20mm to 28mm; and / or, the inner diameter of the inclined steel pipe 203 is preferably 600mm to 1000mm; and / or, the thickness of the inclined steel pipe 203 is preferably 40mm to 50mm; and / or, the outer diameter of the rigid flange 204 needs to be 200mm to 300mm larger than the outer diameter of the outer steel pipe 2014, so that the connection area between the rigid flange 204 and the upper tower tube is larger, which facilitates construction.

[0059] Furthermore, such as Figure 6As shown, in one specific embodiment, the pile cap concrete 3 includes pile top pile cap concrete 301 and post-cast concrete 302. Short steel bars 303 are embedded in the pile top pile cap concrete 301, and the post-cast concrete 302 is located above the pile top pile cap concrete 301. The pile top pile cap concrete 301 is connected to the post-cast concrete 302 through the short steel bars 303, which increases the bonding and anchoring effect between the pile top pile cap concrete 301 and the post-cast concrete 302, and improves the integrity of the pile cap concrete 3. Specifically, the pile cap concrete 301 provides a construction platform for the high pile cap 2, reducing safety issues associated with hoisting large steel structures. Short reinforcing bars 303 are embedded within the pile cap concrete 301, increasing the bond strength between the post-cast concrete 302 and the pile cap concrete 301. When embedding the short reinforcing bars 303, it is necessary to ensure the correspondence between their installation positions and those of the high pile cap 2 to prevent conflict. Some of the short reinforcing bars 303 can be welded to the steel structure at the bottom of the high pile cap 2 to improve the integrity and rigidity of the foundation structure. It should be noted that the high pile cap 2 is embedded within the post-cast concrete 302 of the pile cap concrete 3 to achieve a connection between the high pile cap 2 and the pile cap concrete 3.

[0060] Furthermore, such as Figure 7 As shown, in one specific embodiment, the short reinforcing bars 303 are distributed in a ring on the pile cap concrete 301, increasing the coverage area of ​​the short reinforcing bars 303. Specifically, the short reinforcing bars 303 are divided into three layers located inside the steel tube concrete cylinder 201 and three layers located outside the steel tube concrete cylinder 201, and the short reinforcing bars 303 are evenly distributed along the circumferential direction. The number of short reinforcing bars 303 distributed in the circumferential direction should increase exponentially with each layer. The increase in the number of short reinforcing bars 303 can be based on an even number, such as 6, 8, and 12, to increase the bond strength between the pile cap concrete 301 and the post-cast concrete 302.

[0061] like Figure 1 and Figure 5As shown, in one specific embodiment, the pile foundation 1 adopts a steel-tube reinforced concrete rock-socketed pile foundation. The pile foundation 1 includes an outer steel pipe 100 and reinforced concrete 101. The outer steel pipe 100 is sleeved on the outside of the reinforced concrete 101 and is in close contact with it. For ease of understanding, the top end of the outer steel pipe 100 is referred to as the first end, and the bottom end is referred to as the second end. Specifically, the first end of the outer steel pipe 100 is embedded in the pile cap concrete 301, and the second end of the outer steel pipe 100 is embedded in the rock stratum. By sleeved the outer steel pipe 100 on the outside of the reinforced concrete 101, the axial bearing capacity and lateral stiffness of the steel-concrete composite pile foundation are fully utilized, effectively improving the pile foundation 1's ability to bear compressive and bending loads. At the same time, the installation of the reinforced concrete 101 improves the resistance of the outer steel pipe 100 to local buckling. The lateral restraint of the outer steel pipe 100 on the reinforced concrete 101 effectively improves the compressive strength of the reinforced concrete 101, thereby improving the ductility of the pile foundation 1 under load.

[0062] Furthermore, such as Figure 5 As shown, in one specific embodiment, the reinforced concrete 101 includes a reinforcing steel cage 1011 and concrete 1012, with the reinforcing steel cage 1011 disposed within the concrete 1012 to improve the tensile bearing capacity of the concrete 1012. For ease of understanding, the top end of the reinforcing steel cage 1011 is referred to as the first end 1013, and the cross-section of the first end 1013 of the reinforcing steel cage 1011 tapers upwards, as shown... Figure 5 As shown, the bottom end of the steel reinforcement cage 1011 is called the second end 1014, and the cross-section of the second end 1014 of the steel reinforcement cage 1011 is of equal width.

[0063] The first end 1013 of the reinforcing steel cage 1011 is embedded in the concrete 301 of the pile cap. Because the cross-section of the first end 1013 of the reinforcing steel cage 1011 is tapered and enlarged, the contact area between the first end 1013 of the reinforcing steel cage 1011 and the concrete 301 of the pile cap is larger, which increases the bond strength between the reinforcing steel cage 1011 and the concrete 301 of the pile cap. The second end 1014 of the reinforcing steel cage 1011 is embedded in the rock stratum, and the depth of the second end 1014 of the reinforcing steel cage 1011 embedded in the rock stratum is greater than the depth of the second end of the outer steel pipe 100 of the pile foundation embedded in the rock stratum. Of course, the depth of the second end 1014 of the reinforcing steel cage 1011 embedded in the rock stratum can also be equal to the depth of the second end of the outer steel pipe 100 of the pile foundation embedded in the rock stratum. Because the second end 1014 of the reinforcing steel cage 1011 is embedded in the rock stratum, the anchorage capacity between the pile foundation 1 and the rock stratum is increased, which effectively improves the tensile pull-out bearing capacity of the pile cap foundation. Since the first end 1013 of the reinforcing steel cage 1011 and the first end of the outer steel pipe 100 of the pile foundation are both embedded in the concrete 301 of the pile cap, the bonding performance between the pile foundation 1 and the concrete 3 of the pile cap is improved. At the same time, the second end 1014 of the reinforcing steel cage 1011 and the second end of the outer steel pipe 100 of the pile foundation are both embedded in the rock strata, which effectively increases the compressive and tensile bearing capacity of the pile cap foundation.

[0064] Furthermore, such as Figure 1 As shown, the steel reinforcement cage 1011 includes a main steel bar 1015, and multiple spiral stirrups 1016 are provided on the outside of the main steel bar 1015. The spiral stirrups 1016 are evenly distributed along the length of the main steel bar 1015 so that the spiral stirrups 1016 and the main steel bar 1015 work together to form the steel reinforcement cage 1011, which improves the shear strength of the inclined section.

[0065] Further, in a specific embodiment, the spacing of each spiral stirrup 1016 is preferably 100mm to 200mm; and / or, the diameter of the main reinforcing bar 1015 is preferably 18mm to 28mm; and / or, the wall thickness of the outer steel pipe 100 of the pile foundation is d, and d > 20mm; and / or, the depth to which the second end of the outer steel pipe 100 of the pile foundation is embedded in the rock stratum is h, and h > 1000mm; and / or, the diameter of the short reinforcing bar 303 is preferably 20mm to 24mm; and / or, the short... The length of the reinforcing bar 303 is preferably 250mm to 300mm; and / or, the length of the pile foundation 1 is preferably 25m to 40m; and / or, the depth to which the first end 1013 of the reinforcing bar cage 1011 is embedded in the pile cap concrete 301 is preferably 200mm; and / or, the depth to which the first rectangular stiffening rib 2011 extends into the post-cast concrete 302 is preferably 100mm; and / or, the depth to which the second rectangular stiffening rib 2021 extends into the post-cast concrete 302 is preferably 100mm. It should be noted that the reinforcing bar cage 1011 must meet the requirements for the protective layer thickness, and the distance between the central axes of each pile foundation 1 must be 2 to 3 times the diameter of the pile foundation 1 to avoid an excessively significant group pile effect. The requirements for the protective layer thickness and the spacing requirements of each pile foundation 1 are existing technologies and will not be elaborated upon here.

[0066] In one specific embodiment, the construction steps of the four-corner frame steel-concrete composite high-pile foundation are as follows:

[0067] The first step is to pre-position and weld the reinforcing steel cage 1011 and the outer steel pipe 100 of the pile foundation. The reinforcing steel cage 1011 and the outer steel pipe 100 of the pile foundation are pre-fixed in advance. Positioning points are set in the reinforcing steel cage 1011 and short steel bars 303 are welded to the outer steel pipe 100 of the pile foundation to ensure that the two are on the same axis.

[0068] The second step is to hoist and sink the steel reinforcement cage 1011 and the outer steel pipe 100 of the pile foundation. The main steel bars 1015 of the steel reinforcement cage 1011 and part of the outer steel pipe 100 of the pile foundation are pre-embedded in the rock stratum. The pre-embedded positions of the main steel bars 1015 and the outer steel pipe 100 of the pile foundation need to be adjusted according to the inclination angle set by the pile foundation 1. After the positioning is completed, concrete is poured into the outer steel pipe 100 of the pile foundation so that the outer steel pipe 100 of the pile foundation and the steel reinforcement cage 1011 work together to form a whole with load-bearing capacity.

[0069] The third step is to use a concrete pouring formwork to embed the steel reinforcement cage 1011 at the first end of the pile foundation 1 and part of the external steel pipe 100 of the pile foundation into the concrete 301 of the pile top cap. During the pouring process, it is necessary to ensure that the first end 1013 of the steel reinforcement cage 1011 has sufficient embedment depth to ensure that it meets the protective layer thickness requirements of the concrete 1012. When pouring the concrete 1012 using a concrete pouring formwork, short steel bars 303 are pre-embedded in the concrete 301 of the pile top cap. When arranging the short steel bars 303, space is reserved for the placement of the steel pipe concrete cylinder 201.

[0070] Fourth step: After the pile foundation 1 and the pile cap concrete 301 have reached structural strength, the high pile cap 2 is hoisted and placed on the pile cap concrete 301 according to the predetermined position. The predetermined position is positioned by short steel bars 303. After the high pile cap 2 is placed, the post-cast concrete 302 is poured. During the pouring process, it is ensured that the first rectangular stiffening rib 2011 and the second rectangular stiffening rib 2021 set on the high pile cap 2 have sufficient embedment depth.

[0071] Fifth, after the foundation has achieved structural strength, the remaining tower sections can be connected using the rigid flange 204 installed at the first end of the steel-concrete composite tube 201.

[0072] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A four-legged steel-concrete combined pile cap foundation, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3).

2. The steel-concrete combined pile cap foundation with a quadrangle frame according to claim 1, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3).

3. The steel-concrete combined pile cap foundation with a quadrangle frame according to claim 2, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3).

4. The steel-concrete combined high-pile pile cap foundation of the four-legged type according to claim 3, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3).

5. The steel-concrete combined high-pile pile cap foundation of the four-legged frame according to claim 3, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3).

6. The steel-concrete combined pile cap foundation with a quadrangle frame according to claim 5, characterized in that, The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3), and the first end of the pile foundation (1) is embedded into the high-pile platform concrete (3), and the second end of the pile foundation (1) is embedded into the rock stratum, so that the pile foundation (1) provides stable support for the high-pile platform concrete (3). The utility model relates to a high-pile platform concrete (3) and a pile foundation (1) are provided below the high-pile platform concrete (3 An inner diameter of the inclined steel pipe (203) is 600mm-1000mm; and / or, A thickness of the inclined steel pipe (203) is 40mm-50mm.

7. The steel-concrete combined pile cap foundation with a four-legged frame according to claim 1, characterized in that, The bearing platform concrete (3) comprises pile top bearing platform concrete (301) and post-cast concrete (302); the short steel bars (303) are embedded in the pile top bearing platform concrete (301); the post-cast concrete (302) is located above the pile top bearing platform concrete (301), and the pile top bearing platform concrete (301) is connected with the post-cast concrete (302) through the short steel bars (303).

8. The steel-concrete composite high-pile cap foundation with a four-corner frame according to claim 7, characterized in that, The short steel bars (303) are annularly distributed on the pile top bearing platform concrete (301).

9. The steel-concrete combined high-pile pile cap foundation of the four-legged frame according to claim 7, characterized in that, The pile foundation (1) comprises a pile foundation outer steel pipe (100) and a reinforced concrete (101); the pile foundation outer steel pipe (100) is sleeved outside the reinforced concrete (101) and is attached to the reinforced concrete (101); a first end of the pile foundation outer steel pipe (100) is embedded into the pile top bearing platform concrete (301), and a second end of the pile foundation outer steel pipe (100) is embedded into the rock stratum.

10. The steel-concrete composite high-pile cap foundation with a four-corner frame according to claim 9, characterized in that, The reinforced concrete (101) comprises a steel reinforcement cage (1011) and concrete (1012); a first end portion (1013) of the steel reinforcement cage (1011) is embedded into the pile top bearing platform concrete (301), and a second end portion (1014) of the steel reinforcement cage (1011) is embedded into the rock stratum.

11. The steel-concrete composite high-pile cap foundation with a four-corner frame according to claim 10, characterized in that, The steel reinforcement cage (1011) comprises a main steel bar (1015); a plurality of spiral stirrups (1016) are arranged outside the main steel bar (1015), and the spiral stirrups (1016) are uniformly distributed along a length direction of the main steel bar (1015).

12. The steel-concrete composite high-pile cap foundation with a four-corner frame according to claim 11, characterized in that, A spacing of each spiral stirrup (1016) is 100mm-200mm; and / or, A diameter of the main steel bar (1015) is 18mm-28mm; and / or, A wall thickness of the pile foundation outer steel pipe (100) is d, and d>20mm; and / or, A depth at which the second end of the pile foundation outer steel pipe (100) is embedded into the rock stratum is h, and h>1000mm; and / or, A diameter of the short steel bar (303) is 20mm-24mm; and / or, A length of the short steel bar (303) is 250mm-300mm; and / or, A length of the pile foundation (1) is 25m-40m.

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