Prestressed cable reinforced steel-concrete combined high-pile pile cap foundation

Abstract

The embodiment of the application discloses a prestressed cable reinforced steel and concrete combined high-pile pile cap foundation, which comprises a pile cap concrete, a pile cap steel cylinder which comprises a steel shell and a tower steel pipe, the tower steel pipe is arranged above the pile cap concrete and is connected with the pile cap concrete, the steel shell is sleeved outside the tower steel pipe and is attached to the pile cap concrete, the steel shell is connected with the pile cap concrete through a prestressed cable assembly, a pile foundation is arranged below the pile cap concrete, a first end of the pile foundation is embedded into the pile cap concrete, and a second end of the pile foundation is embedded into a rock layer. The prestressed cable reinforced steel and concrete combined high-pile pile cap foundation provided by the application is characterized in that the steel shell is sleeved outside the tower steel pipe and is attached to the pile cap concrete, the steel shell provides lateral restraint for the pile cap concrete, the steel shell is connected with the pile cap concrete through the prestressed cable assembly, the cracking problem of the connection between the pile cap steel cylinder and the pile cap concrete is effectively avoided, and the reliability of the pile cap foundation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the civil engineering technical field, more particularly, to a prestressed cable reinforced steel and concrete combined high-pile pile cap foundation. BACKGROUND

[0002] At present, there are many pile group cap foundation construction experiences in the construction of bridges and port terminals, so that the design scheme of pile group foundation is proposed in the construction of offshore wind farms, which can effectively reduce the diameter of pile foundation, and the pile group cap foundation has the characteristics of large structural rigidity, controllable pile driving accuracy and low cost, and is suitable for the foundation of wind turbines with anti-collision requirements on the sea.

[0003] In the prior art, the pile group cap foundation used in the wind power tower mainly consists of pile foundation and cap, the pile foundation usually adopts steel pipe pile or steel pipe concrete pile, and the cap adopts cast-in-place reinforced concrete structure. This foundation structure has the characteristics of large rigidity and good integrity, but the joint between the cap concrete and the tower drum connection section is relatively weak, and under the action of strong wind load, the joint between the tower drum and the cap concrete is prone to cracking, which reduces the reliability of the cap foundation and has great safety hazards.

[0004] In addition, the structure of the pile foundation has large self-weight, weak lateral performance, and poor anchoring performance of the pile foundation and the bottom rock layer.

[0005] Therefore, how to improve the reliability of the cap foundation has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a prestressed cable reinforced steel and concrete combined high-pile pile cap foundation to improve the reliability of the cap foundation.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0008] A prestressed cable reinforced steel and concrete combined high-pile pile cap foundation, comprising:

[0009] Cap concrete;

[0010] Cap steel cylinder; the cap steel cylinder comprises a steel shell and a tower steel pipe; the tower steel pipe is arranged above the cap concrete and connected with the cap concrete; the steel shell is sleeved on the outer side of the tower steel pipe and adheres to the cap concrete; the steel shell is connected with the cap concrete through a prestressed cable assembly;

[0011] Pile foundation arranged below the cap concrete; the first end of the pile foundation is embedded into the cap concrete, and the second end of the pile foundation is embedded into the rock layer, so that the pile foundation provides stable support for the cap concrete.

[0012] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, the prestressed cable assembly comprises a prestressed cable, a first clamping anchor and a second clamping anchor; the prestressed cable is connected between the first clamping anchor and the second clamping anchor; the first clamping anchor is anchored to the pile cap concrete, and the second clamping anchor is anchored to the steel shell, so as to provide a pre-compression load for the prestressed cable.

[0013] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, the pile cap concrete comprises pile top pile cap concrete and post-poured concrete; the post-poured concrete is located above the pile top pile cap concrete; the pile top pile cap concrete is provided with a first prestressed cable mounting hole; the first clamping anchor is mounted in the first prestressed cable mounting hole; the top plate of the steel shell is provided with a second prestressed cable mounting hole, and the second prestressed cable mounting holes are uniformly arranged in the circumferential direction; the second clamping anchor is mounted in the second prestressed cable mounting hole; the first prestressed cable mounting hole and the second prestressed cable mounting hole are arranged one by one in correspondence.

[0014] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, a reinforcing part is arranged on the top plate of the steel shell at the position of the second prestressed cable mounting hole, and the reinforcing part is located on the inner side of the steel shell.

[0015] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, a flange plate is arranged at the first end of the tower tube steel pipe, and the flange plate is used for connecting an upper tower tube; a pouring channel is arranged at the second end of the tower tube steel pipe; a plurality of pouring channels are uniformly arranged in the circumferential direction at the second end of the tower tube steel pipe, and are used for pouring the post-poured concrete.

[0016] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, a rectangular reinforcing rib plate is arranged at the second end of the tower tube steel pipe, and the rectangular reinforcing rib plate and the pouring channel are arranged in the circumferential direction in a staggered manner; the rectangular reinforcing rib plate and the tower tube steel pipe are connected by welding; the top of the rectangular reinforcing rib plate is connected with the top plate of the steel shell; the bottom of the rectangular reinforcing rib plate is on the same horizontal plane as the bottom of the tower tube steel pipe.

[0017] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, circumferential steel bars are arranged in the horizontal direction of the rectangular reinforcing rib plate.

[0018] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, the pile foundation comprises:

[0019] The hollow sandwich steel pipe comprises 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;

[0020] The sandwich reinforced concrete is arranged in the cavity.

[0021] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, the sandwich reinforced concrete comprises a steel framework and sandwich concrete; the steel framework is arranged in the sandwich concrete; a first end of the steel framework is embedded in the pile cap concrete; and a second end of the steel framework is embedded into the rock layer.

[0022] Optionally, in the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation, the steel framework comprises a main steel bar; a plurality of spiral stirrups are arranged on the outer side of the main steel bar and are uniformly arranged along the length direction of the main steel bar.

[0023] The prestressed cable reinforced steel-concrete combined high-pile pile cap foundation provided by the application is provided with a tower tube steel pipe above the pile cap concrete, is provided with a pile foundation below the pile cap concrete, and the first end of the pile foundation is embedded in the pile cap concrete and the second end of the pile foundation is embedded into the rock layer, so that the pile foundation provides stable support for the pile cap concrete. The outer side of the tower tube steel pipe is sleeved with a steel shell, and the steel shell is attached to the pile cap concrete. The steel shell and the pile cap concrete are connected through a prestressed cable assembly, the connecting rigidity of the pile cap steel tube and the pile cap concrete is improved, the steel shell provides lateral restraint for the pile cap concrete, the lateral rigidity of the pile cap concrete is increased, and the cracking problem at the connection between the pile cap steel tube and the pile cap concrete is effectively avoided.

[0024] Compared with the prior art, the prestressed cable reinforced steel-concrete combined high-pile pile cap foundation provided by the application is provided with a steel shell sleeved on the outer side of the tower tube steel pipe, and the steel shell is attached to the pile cap concrete, so that the steel shell provides lateral restraint for the pile cap concrete. The steel shell and the pile cap concrete are connected through a prestressed cable assembly, the connecting rigidity of the pile cap steel tube and the pile cap concrete is improved, the cracking problem at the connection between the pile cap steel tube and the pile cap concrete is effectively avoided, and the reliability of the pile cap foundation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1The axial side view of the prestressed cable reinforced steel and concrete combined high-pile pile cap foundation is provided for the embodiment of the present application;

[0027] Figure 2 The front view of the prestressed cable reinforced steel and concrete combined high-pile pile cap foundation is provided for the embodiment of the present application;

[0028] Figure 3 The schematic diagram of the connection between the pile foundation and the pile cap concrete is provided for the embodiment of the present application;

[0029] Figure 4 The structural schematic diagram of the pile cap steel cylinder is provided for the embodiment of the present application;

[0030] Figure 5 The structural schematic diagram of the prestressed cable assembly is provided for the embodiment of the present application.

[0031] Wherein, 1 is a pile foundation, 100 is a steel reinforcement cage, 1001 is a first end, 1002 is a second end, 1003 is a main steel bar, 1004 is a spiral stirrup, 101 is a hollow sandwich steel pipe, 1011 is an outer steel pipe, 1012 is an inner steel pipe, 102 is a sandwiched reinforced concrete, 1021 is sandwiched concrete, 103 is a first prestressed cable installation hole, 2 is a steel cylinder concrete pile cap, 201 is pile cap concrete, 2011 is pile top pile cap concrete, 2012 is post-cast concrete, 202 is a pile cap steel cylinder, 2021 is a steel shell, 2022 is a tower cylinder steel pipe, 2023 is a flange plate, 2024 is a pouring channel, 2025 is a rectangular stiffening rib plate, 2026 is a circumferential steel bar, 203 is a second prestressed cable installation hole, 3 is a prestressed cable assembly, 301 is a prestressed cable, 302 is a first clamping piece anchor, and 303 is a second clamping piece anchor. DETAILED DESCRIPTION

[0032] The core of the present application is to provide a prestressed cable reinforced steel and concrete combined high-pile pile cap foundation to improve the reliability of the pile cap foundation.

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As shown in Figure 1 and Figure 2 The present application discloses a prestressed cable reinforced steel and concrete combined high-pile pile cap foundation, which comprises pile cap concrete 201, pile cap steel cylinder 202 and pile foundation 1. It should be noted that, Figure 1 and Figure 2The steel cylinder concrete pile cap 2 shown in the figure comprises a pile cap concrete 201 and a pile cap steel cylinder 202, and the embodiment of the present application is explained and described with respect to a high-pile pile cap foundation. In the following, the pile cap foundation refers to the high-pile pile cap foundation unless otherwise specified.

[0035] As shown in the figure, Figure 1 and Figure 2 The pile cap steel cylinder 202 comprises a steel shell 2021 and a tower cylinder steel pipe 2022. The tower cylinder steel pipe 2022 is arranged above the pile cap concrete 201 and connected with the pile cap concrete 201. The steel shell 2021 is sleeved outside the tower cylinder steel pipe 2022 and closely adheres to the pile cap concrete 201. The steel shell 2021 and the pile cap concrete 201 are connected by the prestressed cable assembly 3. Specifically, the steel shell 2021 is sleeved outside the tower cylinder steel pipe 2022 and connected with the outer wall of the tower cylinder steel pipe 2022 by welding, thereby increasing the connection strength of the steel shell 2021 and the tower cylinder steel pipe 2022. Further, the inner wall of the steel shell 2021 closely adheres to the outer side of the pile cap concrete 201, so that the side wall of the steel shell 2021 provides lateral restraint for the pile cap concrete 201, thereby increasing the lateral stiffness of the pile cap concrete 201. Meanwhile, the steel shell 2021 and the pile cap concrete 201 are connected by the prestressed cable assembly 3. The pre-compression force generated by the prestressed cable assembly 3 effectively avoids the cracking problem at the connection between the pile cap steel cylinder 202 and the pile cap concrete 201 under the action of the horizontal wind load.

[0036] As can be understood by those skilled in the art, when the existing pile cap foundation is subjected to the horizontal wind load, the connection between the pile cap concrete 201 and the pile cap steel cylinder 202 will exhibit a mechanical phenomenon of one side being in tension and the other side being in compression. Since the connection between the pile cap concrete 201 and the pile cap steel cylinder 202 is bonded by concrete, the concrete at the connection is prone to cracking due to the low tensile strength of the concrete. In the embodiment of the present application, the pre-compression stress applied by the tensioned prestressed cable assembly 3 can offset the tensile stress generated by the horizontal wind load, thereby ensuring the connection reliability of the pile cap concrete 201 and the pile cap steel cylinder 202, improving the overall stress performance of the steel cylinder concrete pile cap 2, and further improving the reliability of the pile cap foundation.

[0037] The pile foundation 1 is arranged below the pile cap concrete 201, and the first end of the pile foundation 1 is embedded into the pile cap concrete 201, and the second end of the pile foundation 1 is embedded into the rock layer, so as to provide stable support for the pile cap concrete 201. In the embodiment of the present application, the pile foundation adopts a group pile foundation form, which can effectively reduce the precision requirement of inserting the pile foundation 1 in the sea, and the pile cap concrete 201 provides a construction platform for the pile cap steel cylinder 202, facilitating the construction of the upper pile cap structure.

[0038] The pile foundation 1 is arranged below the pile cap concrete 201, the first end of the pile foundation 1 is embedded into the pile cap concrete 201, and the second end of the pile foundation 1 is embedded into the rock layer, so that the pile foundation 1 provides stable support for the pile cap concrete 201.

[0039] The prestressed cable reinforced steel and concrete combined high-pile pile cap foundation provided by the present application is provided with a tower tube steel pipe 2022 above the pile cap concrete 201 and a pile foundation 1 below the pile cap concrete 201, and the first end of the pile foundation 1 is embedded into the pile cap concrete 201, and the second end of the pile foundation 1 is embedded into the rock layer, so that the pile foundation 1 provides stable support for the pile cap concrete 201. The outer side of the tower tube steel pipe 2022 is sleeved with a steel shell 2021, and the steel shell 2021 is attached to the pile cap concrete 201, and the steel shell 2021 is connected with the pile cap concrete 201 through a prestressed cable assembly 3, thereby improving the connecting rigidity of the pile cap steel tube 202 and the pile cap concrete 201, and at the same time, the steel shell 2021 provides lateral restraint for the pile cap concrete 201, thereby increasing the lateral rigidity of the pile cap concrete 201 and effectively avoiding the cracking problem at the connecting position of the pile cap steel tube 202 and the pile cap concrete 201.

[0040] Compared with the prior art, the prestressed cable reinforced steel and concrete combined high-pile pile cap foundation provided by the present application is provided with a steel shell 2021 sleeved on the outer side of the tower tube steel pipe 2022, and the steel shell 2021 is attached to the pile cap concrete 201, so that the steel shell 2021 provides lateral restraint for the pile cap concrete 201, and at the same time, the steel shell 2021 is connected with the pile cap concrete 201 through a prestressed cable assembly 3, thereby improving the connecting rigidity of the pile cap steel tube 202 and the pile cap concrete 201, effectively avoiding the cracking problem at the connecting position of the pile cap steel tube 202 and the pile cap concrete 201, and further improving the reliability of the pile foundation.

[0041] Further, as shown in Figure 2 , Figure 3 and Figure 5 , the prestressed cable assembly 3 includes a prestressed cable 301, a first clamping anchor 302 and a second clamping anchor 303. The prestressed cable 301 is connected between the first clamping anchor 302 and the second clamping anchor 303. The first clamping anchor 302 is anchored to the pile cap concrete 201, and the second clamping anchor 303 is anchored to the steel shell 2021, so as to provide pre-compression load for the prestressed cable 301. Specifically, the pile cap concrete 201 includes a pile top pile cap concrete 2011 and a post-cast concrete 2012. The post-cast concrete 2012 is located above the pile top pile cap concrete 2011, and the cross-sectional size of the post-cast concrete 2012 is consistent with that of the pile top pile cap concrete 2011. Since the pile top pile cap concrete 2011 is constructed by using a formwork, a first prestressed cable installation hole 103 is arranged in the pile top pile cap concrete 2011, and the first clamping anchor 302 is installed in the first prestressed cable installation hole 103.Figure 4 As shown, the top plate of the steel shell 2021 is provided with second prestressed cable installation holes 203, and the second prestressed cable installation holes 203 are uniformly arranged along the ring direction. The second clamping anchor 303 is installed in the second prestressed cable installation hole 203. Since the first prestressed cable installation hole 103 and the second prestressed cable installation hole 203 are arranged one by one, the first prestressed cable installation hole 103 and the second prestressed cable installation hole 203 are uniformly arranged along the ring direction correspondingly, so that the distribution of the applied pre-compressive stress is more uniform, and the overall stress performance of the pile cap foundation is improved.

[0042] As can be understood by those skilled in the art, the first clamping anchor 302 is installed in the first prestressed cable installation hole 103, and the second clamping anchor 303 is installed in the second prestressed cable installation hole 203. The steel strand of the prestressed cable 301 is threaded through the taper hole of the first clamping anchor 302 one by one, and then the prestressed cable 301 is tensioned on one side of the second clamping anchor 303. After tensioning, the prestressed cable 301 in the anchor hole is anchored by the clamping piece in the second clamping anchor 303, that is, the installation of the prestressed cable assembly 3 is completed. The anchoring of the first clamping anchor 302 and the second clamping anchor 303 provides a pre-compressive load, which offsets the tensile stress generated by the horizontal wind load, ensures the connection reliability of the pile cap concrete 201 and the pile cap steel cylinder 202, improves the overall stress performance of the steel cylinder concrete pile cap 2, and further improves the reliability of the pile cap foundation.

[0043] In order to meet the anchoring requirements of the prestressed cable assembly 3, the first clamping anchor 302 and the second clamping anchor 303 are arranged as shown in the figure. Figure 4 As shown, the top plate of the steel shell 2021 at the position of the second prestressed cable installation hole 203 is provided with a reinforcing part, and the reinforcing part is located on the inner side of the steel shell 2021. Specifically, the reinforcing part is a local thickening area of the top plate of the steel shell 2021 around the position of the second prestressed cable installation hole 203, which effectively ensures the transmission of the pre-compressive load. It should be noted that the increased thickness of the local thickening area of the top plate of the steel shell 2021 can be 1 times to 1.5 times the thickness of the top plate of the steel shell 2021

[0044] As shown in the figure, Figure 1 and Figure 4As shown, in one specific embodiment, a flange 2023 is provided at the first end of the tower steel pipe 2022. The flange 2023 has evenly distributed connecting holes along its circumferential direction to facilitate connection of the flange 2023 to the upper tower section. A grouting channel 2024 is provided at the second end of the tower steel pipe 2022. Multiple grouting channels 2024 are arranged circumferentially and evenly at the second end of the tower steel pipe 2022 for grouting post-cast concrete 2012. Specifically, the tower steel pipe 2022 includes an inner tower steel pipe and an outer tower steel pipe, forming a tower cavity between the inner and outer tower steel pipes, into which concrete is poured. The 2022 tower steel pipe adopts a hollow sandwich structure, which utilizes the restraining effect of the outer and inner steel pipes on the concrete to improve the ultimate compressive bearing capacity of the 2022 tower steel pipe. At the same time, it reduces the structural self-weight of the 2022 tower steel pipe, reduces the on-site concrete pouring work, and lowers the cost.

[0045] Furthermore, each grouting channel 2024 is connected between the side walls of the inner and outer steel pipes of the tower, ensuring that the post-cast concrete 2012 can be poured into the foundation concrete 201 through the grouting channels 2024. Simultaneously, the foundation steel cylinder 202 provides a formwork for the post-cast concrete 2012 within the foundation concrete 201, eliminating the need for numerous temporary formwork installations, thus improving construction speed and reducing costs. It should be noted that the grouting channels 2024 are square grouting holes, and the concrete inside the tower cavity and the post-cast concrete 2012 can be poured simultaneously to ensure the concrete forms a unified load-bearing system.

[0046] like Figure 4 As shown, in one specific embodiment, a rectangular stiffening rib 2025 is provided at the second end of the tower steel pipe 2022, and the rectangular stiffening rib 2025 and the grouting channel 2024 are arranged alternately in the circumferential direction. The rectangular stiffening rib 2025 is connected to the tower steel pipe 2022 by welding, and the top of the rectangular stiffening rib 2025 is connected to the top plate of the steel shell 2021 by welding, thereby improving the connection strength between the steel shell 2021 and the tower steel pipe 2022. The bottom of the rectangular stiffening rib 2025 is on the same horizontal plane as the bottom of the tower steel pipe 2022 to ensure a larger contact area between the bottom of the tower steel pipe 2022 and the foundation concrete 201, thus increasing the connection strength between the tower steel pipe 2022 and the foundation concrete 201 and helping to avoid cracking at the connection between the foundation steel pipe 202 and the foundation concrete 201. It should be noted that the rectangular stiffening rib 2025 is located between the reinforcing parts of the top plate of the adjacent steel shell 2021.

[0047] Furthermore, such as Figure 4As shown in the drawings, the hoop reinforcement 2026 is arranged in the horizontal direction of the rectangular stiffening rib plate 2025, so that each rectangular stiffening rib plate 2025 forms an integral force system to cooperate with each other. Specifically, in the embodiment, the hoop reinforcement 2026 is uniformly arranged along the height direction of the rectangular stiffening rib plate 2025 and is connected with the rectangular stiffening rib plate 2025 by welding, so as to improve the connection strength between the hoop reinforcement 2026 and the rectangular stiffening rib plate 2025, thereby facilitating the cooperation of each rectangular stiffening rib plate 2025.

[0048] Further, as shown in the drawings, Figure 2 and Figure 3 In a specific embodiment, the pile foundation 1 includes a hollow sandwich steel pipe 101 and a sandwich reinforced concrete 102. The hollow sandwich steel pipe 101 includes an inner steel pipe 1012 and an outer steel pipe 1011 sleeved on the inner steel pipe 1012, and a cavity is formed between the inner steel pipe 1012 and the outer steel pipe 1011, and the sandwich reinforced concrete 102 is arranged in the cavity. In the embodiment of the present application, the hollow sandwich pile foundation 1 makes full use of the excellent performance of the hollow sandwich steel pipe concrete composite structure, that is, large lateral stiffness and light weight, effectively improves the bearing capacity of the pile foundation 1 to bear the horizontal load, and the sandwich reinforced concrete 102 improves the buckling resistance of the outer steel pipe 1011 and the inner steel pipe 1012, and the lateral restraint of the hollow sandwich steel pipe 101 to the sandwich reinforced concrete 102 effectively improves the compression resistance of the sandwich reinforced concrete 102, thereby improving the ductility of the pile foundation 1 after being subjected to load. In addition, the inner steel pipe 1012 and the sandwich reinforced concrete 102 are embedded in the rock layer, which increases the anchoring capacity of the pile foundation 1 and the rock layer, and effectively improves the pullout resistance of the pile foundation 1. It should be noted that the depth of the inner steel pipe 1012 and the sandwich reinforced concrete 102 embedded in the rock layer can be greater than the depth of the outer steel pipe 1011 embedded in the rock layer, so as to further increase the anchoring capacity of the pile foundation 1 and the rock layer.

[0049] Further, as shown in the drawings, Figure 3As shown, the sandwich reinforced concrete 102 comprises a reinforced framework 100 and a sandwich concrete 1021, the reinforced framework 100 is arranged in the sandwich concrete 1021, for the convenience of understanding, the top end of the reinforced framework 100 is called the first end 1001, and the cross section of the first end 1001 of the reinforced framework 100 is tapered and increases, the bottom end of the reinforced framework 100 is called the second end 1002, and the cross section of the second end 1002 of the reinforced framework 100 is equal in width. Wherein, the first end 1001 of the reinforced framework 100 is embedded in the pile top cap concrete 2011, due to the tapered and increasing cross section of the first end 1001 of the reinforced framework 100, the contact area of the first end 1001 of the reinforced framework 100 with the pile top cap concrete 2011 is larger, the bonding force between the reinforced framework 100 and the pile top cap concrete 2011 is increased, the second end 1002 of the reinforced framework 100 is embedded into the rock stratum, the anchoring capacity of the pile foundation 1 and the rock stratum is increased, and the pullout bearing capacity of the cap foundation is effectively improved.

[0050] Further, as shown in the figure, Figure 3 The reinforced framework 100 comprises a main reinforcement 1003, and a plurality of spiral stirrups 1004 are arranged outside the main reinforcement 1003, each spiral stirrup 1004 is uniformly arranged along the length direction of the main reinforcement 1003, so that the spiral stirrups 1004 and the main reinforcement 1003 jointly form the reinforced framework 100, and the shear strength of the oblique section is improved. It should be noted that the spiral stirrups 1004 and the main reinforcement 1003 are connected by welding.

[0051] The steel cylinder concrete cap 2 provided by the embodiment of the present application, wherein the cap concrete 201 provides a good anchoring medium for the pile foundation 1, effectively ensuring the transmission of the upper structure to the pile foundation after loading. The cap steel cylinder 202 is connected with the cap concrete 201 through the post-cast concrete 2012, the rectangular stiffening rib plate 2025 and the circumferential reinforcement 2026 arranged at the bottom of the tower cylinder steel pipe 2022 effectively increase the bonding force between the cap steel cylinder 202 and the cap concrete 201, and the pouring hole 2024 arranged at the bottom of the tower cylinder steel pipe 2022 solves the problem of lacking of concrete pouring hole after the steel shell 2021 is coated, at the same time, the tower cylinder steel pipe 2022 and the steel shell 2021 both adopt steel structure, which can avoid the cracking problem of the connection between the tower cylinder and the cap concrete 201 under the action of horizontal wind load at sea, fully plays the material performance of steel material with the same tensile and compressive properties, and the tower cylinder steel pipe 2022 and the pile foundation 1 both adopt the hollow sandwich structure, which can reduce the concrete volume, at the same time, reduces the self weight of the cap foundation, which is beneficial to increase the service life of the cap foundation. It should be noted that the upper structure comprises an upper tower cylinder and the cap steel cylinder 202.

[0052] The terms "first" and "second", and the like, in the description and in the claims of the present application and in the above-described drawings, are used for distinguishing between similar objects, not for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like, are meant to be interpreted under their broadest meaningful terms as encompassing instead of excluding. For example, a process, method, system, product or apparatus that comprises a list of steps or units is not necessarily limited to those listed steps or units but can include further steps or units not expressly listed or other similar steps or units.

[0053] The above description of disclosed embodiments of the application allows skilled persons in the art to make and use the application. Numerous modifications to these embodiments will be apparent to those skilled in the art, and general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application 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 prestressed cable reinforced steel-concrete combined pile cap foundation, characterized in that, The utility model relates to a pile foundation structure, which comprises: a bearing platform concrete (201); a bearing platform steel cylinder (202), wherein the bearing platform steel cylinder (202) comprises a steel shell (2021) and a tower cylinder steel pipe (2022); the tower cylinder steel pipe (2022) is arranged above the bearing platform concrete (201) and is connected with the bearing platform concrete (201); the steel shell (2021) is sleeved outside the tower cylinder steel pipe (2022) and is attached to the bearing platform concrete (201) so that the steel shell provides lateral restraint for the bearing platform concrete; the steel shell (2021) is connected with the bearing platform concrete (201) through a prestressed cable assembly (3); a pile foundation (1) arranged below the bearing platform concrete (201); a first end of the pile foundation (1) is embedded into the bearing platform concrete (201), and a second end of the pile foundation (1) is embedded into a rock stratum so that the pile foundation (1) provides stable support for the bearing platform concrete (201); the prestressed cable assembly (3) comprises a prestressed cable (301), a first clamping piece anchor (302) and a second clamping piece anchor (303); the prestressed cable (301) is connected between the first clamping piece anchor (302) and the second clamping piece anchor (303); the first clamping piece anchor (302) is anchored to the bearing platform concrete (201), and the second clamping piece anchor (303) is anchored to the steel shell (2021) to provide a pre-compression load for the prestressed cable (301); the bearing platform concrete (201) comprises a pile top bearing platform concrete (2011); the pile top bearing platform concrete (2011) is provided with a first prestressed cable mounting hole (103); the first clamping piece anchor (302) is mounted in the first prestressed cable mounting hole (103); a top plate of the steel shell (2021) is provided with a second prestressed cable mounting hole (203), and the second prestressed cable mounting hole (203) is uniformly arranged in a ring direction; the second clamping piece anchor (303) is mounted in the second prestressed cable mounting hole (203); the first prestressed cable mounting hole (103) and the second prestressed cable mounting hole (203) are arranged one by one in correspondence.

2. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 1, wherein, The bearing platform concrete (201) further comprises post-poured concrete (2012); the post-poured concrete (2012) is located above the pile top bearing platform concrete (2011).

3. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 1, wherein, A reinforcing part is arranged on the top plate of the steel shell (2021) at a position of the second prestressed cable mounting hole (203), and the reinforcing part is located inside the steel shell (2021).

4. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 2, wherein, A flange plate (2023) is arranged at a first end of the tower cylinder steel pipe (2022), and the flange plate (2023) is used for connecting an upper tower cylinder; a plurality of pouring channels (2024) are arranged at a second end of the tower cylinder steel pipe (2022) and are uniformly arranged in a ring direction, and the pouring channels (2024) are used for pouring the post-poured concrete (2012).

5. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 4, wherein, The second end of the tower drum steel pipe (2022) is provided with a rectangular stiffening rib plate (2025), and the rectangular stiffening rib plate (2025) and the perfusion channel (2024) are arranged in a ring direction; the rectangular stiffening rib plate (2025) and the tower drum steel pipe (2022) are connected by welding; the top of the rectangular stiffening rib plate (2025) is connected with the top plate of the steel shell (2021); the bottom of the rectangular stiffening rib plate (2025) is on the same horizontal plane with the bottom of the tower drum steel pipe (2022).

6. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 5, wherein, The rectangular stiffening rib plate (2025) is provided with a ring-shaped steel bar (2026) in the horizontal direction.

7. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 1, wherein The pile foundation (1) comprises: A hollow sandwich steel pipe (101); the hollow sandwich steel pipe (101) comprises an inner steel pipe (1012) and an outer steel pipe (1011) sleeved on the inner steel pipe (1012); a cavity is formed between the inner steel pipe (1012) and the outer steel pipe (1011); A sandwich reinforced concrete (102) arranged in the cavity.

8. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 7, wherein, The sandwich reinforced concrete (102) comprises a steel reinforcement cage (100) and a sandwich concrete (1021); the steel reinforcement cage (100) is arranged in the sandwich concrete (1021); a first end (1001) of the steel reinforcement cage (100) is embedded in the pile top cap concrete (2011); a second end (1002) of the steel reinforcement cage (100) is embedded into the rock layer.

9. The prestressed cable reinforced steel-concrete combined pile cap foundation of claim 8, wherein, The steel reinforcement cage (100) comprises a main steel bar (1003); a plurality of spiral stirrups (1004) are arranged on the outer side of the main steel bar (1003), and the spiral stirrups (1004) are uniformly arranged along the length direction of the main steel bar (1003).

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