Iron tower short pile inclined anchor rod composite foundation and construction method

Abstract

The invention relates to the technical field of iron tower foundations, and discloses an iron tower short pile inclined anchor rod composite foundation and a construction method. A center pit is formed in the center of the bottom of a foundation pit, and a plurality of side edge inclined pits are distributed in the side edge of the bottom of the foundation pit at equal intervals; self-tensioning inclined anchor rod assemblies are arranged in the side inclined pits, middle connecting frames between the tops of the self-tensioning inclined anchor rod assemblies are fixed through bolts, a positioning base assembly clamped between the outer sides of the tops of the self-tensioning inclined anchor rod assemblies is arranged in the foundation pit, and a short pile steel bar assembly is arranged in the middle of the interior of the positioning base assembly. All the components can be prefabricated in advance and then are hoisted and combined on site, the construction efficiency is improved, a whole can be formed after combination, and the structural strength is enhanced; the self-tensioning inclined anchor rod assembly is anchored in the foundation, so that horizontal load and upward pulling force transmitted by an iron tower are borne, the contact area of the foundation and a soil body is increased, the foundation can better adapt to complex geological conditions, and the stability and the bearing capacity of the foundation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of iron tower foundations, in particular to an iron tower short pile oblique anchor rod composite foundation and a construction method. Background Art

[0002] In the field of power engineering construction, tower foundations are the key structures supporting transmission towers, and their performance is directly related to the safe and stable operation of transmission lines. As the scale of power grid construction continues to expand, transmission lines must traverse areas with complex geological conditions, such as mountainous terrain with thick soil layers and underlying bedrock. Traditional tower foundations face numerous challenges.

[0003] At present, the commonly used tower foundations have limitations in resisting horizontal loads and uplift forces. When the tower is subjected to external forces such as strong winds and earthquakes, the foundation is prone to displacement, tilting or even overturning, seriously threatening the safety of the transmission line.

[0004] At the same time, existing tower foundation construction methods suffer from low efficiency and poor structural integrity. Environmental factors significantly impact construction quality, making it difficult to guarantee quality. The connection between components is not rational, leading to positional shifts during assembly and requiring subsequent readjustment, which increases the complexity of construction. Over long-term use, stress concentration can easily occur, leading to structural damage and increased maintenance costs. To address this, we have developed a short-pile, inclined anchor rod composite foundation for towers and its construction method. Summary of the Invention

[0005] The object of the present invention is to provide a composite foundation of short piles and inclined anchor rods for an iron tower and a construction method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A short-pile and inclined anchor composite foundation for an iron tower comprises a foundation pit, wherein a central pit is provided at the center of the bottom of the foundation pit, and a plurality of side inclined pits are evenly spaced on the sides of the bottom of the foundation pit;

[0008] A self-tensioning oblique anchor rod assembly is provided in the side oblique pit, and the middle connecting frame between the tops of the self-tensioning oblique anchor rod assembly is fixed with bolts. A positioning base assembly is provided in the foundation pit and is clamped between the outer sides of the tops of the self-tensioning oblique anchor rod assembly. A short pile steel bar assembly is centrally provided inside the positioning base assembly, and the bottom of the short pile steel bar assembly passes through the middle connecting frame and extends into the central pit, and the top of the short pile steel bar assembly extends out of the foundation pit.

[0009] Preferably, the bottom of the side inclined pit is arranged to expand downward along the outer side of the bottom of the foundation pit.

[0010] Preferably, the self-tensioning oblique anchor rod assembly comprises a trumpet tensioning head extending into the side oblique pit, a reinforced outer frame and a reinforced inner frame fixed to the upper end of the trumpet tensioning head, and an oblique anchor rod member passing through the trumpet tensioning head and the reinforced inner frame;

[0011] The horn tensioning head comprises a positioning frame, a horn-shaped clamping head separated by a plurality of equally spaced slots at the bottom of the positioning frame, and a connecting tube centrally arranged at the top of the positioning frame;

[0012] The oblique anchor rod member includes a tensioning head which is narrow at the top and wide at the bottom, and an oblique anchor rod connected to the top of the tensioning head. The top of the oblique anchor rod extends through the trumpet tensioning head and the reinforced inner frame.

[0013] Preferably, the middle connecting frame includes a middle ring seat located on the outer side of the top of the central pit and inclined plates arranged at equal intervals on the sides of the middle ring seat, and the inclined plates are provided with rectangular slots;

[0014] The bottom of the inclined plate is tightly attached to the top of the reinforced inner frame, and the inclined anchor rod extends through the corresponding rectangular slot. After the bolt and the inclined anchor rod are locked and fixed, the bolt is supported on the top of the inclined plate, and the tensioning head stretches the trumpet-shaped clamping head so that the trumpet-shaped clamping head is clamped on the inner wall of the side inclined pit.

[0015] Preferably, the outer surface of the trumpet-shaped clamping head is provided with a plurality of groups of clamping protrusions;

[0016] The reinforced outer frame comprises a plurality of groups of circular and equally spaced reinforced outer steel bars and outer steel stirrups fixed at equal intervals on the outside of the plurality of groups of reinforced outer steel bars;

[0017] The reinforced outer steel bars are inserted into corresponding positioning holes on the positioning frame;

[0018] The reinforced inner frame includes a plurality of groups of circular and equally spaced reinforced inner steel bars, inner steel stirrups fixed at equal intervals to the outside of the plurality of groups of reinforced inner steel bars, and positioning plates fixed to the tops of the plurality of groups of reinforced inner steel bars;

[0019] The oblique anchor rod extends through the reserved hole in the middle of the positioning plate, so that the reinforced inner frame is centrally positioned inside the reinforced outer frame.

[0020] Preferably, the positioning base assembly includes several groups of positioning annular seats arranged at equal intervals above and below and side stirrups fixed at equal intervals on the outside of the several groups of positioning annular seats. The diameter of the positioning annular seats increases from top to bottom, and the positioning annular seats are clamped on the outside of several groups of inclined anchor rods.

[0021] Preferably, the short pile steel bar assembly includes a plurality of groups of short pile steel bars that are circular and evenly spaced, inner stirrups fixed at equal intervals to the inner walls of the plurality of groups of short pile steel bars, and outer stirrups fixed at equal intervals to the outer walls of the plurality of groups of short pile steel bars.

[0022] A plurality of groups of support arms are connected at equal intervals to the outside of the inner stirrups at the top, and the support arms are fixed on the positioning annular seat at the top.

[0023] The present invention also provides a construction method for a short-pile, inclined anchor rod composite foundation of an iron tower, which specifically comprises the following steps:

[0024] S1. Insert the self-tensioning oblique anchor rod assembly into the side oblique pit and fix the middle connecting frame to the top of the self-tensioning oblique anchor rod assembly with bolts;

[0025] S2. Fix the short pile reinforcement assembly on the positioning base assembly, and then hoist the positioning base assembly and the short pile reinforcement assembly as a whole, so that the positioning base assembly is stuck between the top and outer sides of the self-tensioning oblique anchor assembly, and the bottom of the short pile reinforcement assembly passes through the middle connecting frame and extends into the center of the center pit;

[0026] S3. Then pour concrete into the foundation pit, side inclined pits and center pit and wait for curing to take shape.

[0027] Compared with the prior art, the present invention has the following advantages: each component of the present invention can be prefabricated in advance and then assembled on-site, improving construction efficiency. After assembly, it forms a complete unit, enhancing structural strength. The overall strength and rigidity of the self-tensioning inclined anchor assembly itself are increased, and the self-tensioning inclined anchor assembly is anchored in the foundation, thereby withstanding the horizontal load and uplift force transmitted from the tower. The provision of multiple groups of self-tensioning inclined anchor assemblies increases the contact area between the foundation and the soil, better adapting to complex geological conditions and improving the foundation's stability and bearing capacity. Bolting not only achieves connection between the self-tensioning inclined anchor assemblies but also provides support for the tensioning heads of the self-tensioning inclined anchor assemblies, ensuring the self-tensioning function.

[0028] The positioning base assembly is stuck between the top and outer sides of the self-tensioning oblique anchor rod assembly, and can position and restrain the self-tensioning oblique anchor rod assembly, preventing it from shifting during construction and stress-bearing. Furthermore, when the positioning base assembly and the short pile rebar assembly are hoisted as a whole, they can position both, preventing the positioning base assembly and the short pile rebar assembly from deflecting as a whole, until the short pile rebar assembly is vertically and centrally inserted into the center pit. After the positioning base assembly is combined with the concrete, it can better coordinate with the oblique anchor rod and the surrounding concrete. The positioning base assembly can form a step-like structure in the concrete, increasing the contact area and friction with the concrete, making the connection between the positioning base assembly and the concrete tighter, thereby enhancing the integrity of the entire composite foundation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a schematic diagram of the exploded structure of the overall assembly of the present invention;

[0030] Figure 2 This is a cross-sectional view of the present invention after installation and assembly in the soil layer;

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall assembly of the present invention;

[0032] Figure 4 This is a schematic diagram of the exploded structure of the self-tensioning oblique anchor assembly of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the oblique anchor rod of the present invention;

[0034] Figure 6 This is a structural diagram of the speaker tensioning head of the present invention;

[0035] Figure 7 This is a schematic diagram of the exploded structure of the assembly of the reinforced external frame and the reinforced internal frame of the present invention;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the self-tensioning oblique anchor rod assembly of the present invention;

[0037] Figure 9 For the present invention Figure 8 Schematic diagram of the cross-sectional structure;

[0038] Figure 10 It is a schematic diagram of the three-dimensional structure of the self-tensioning oblique anchor rod assembly and the middle connecting frame installed in the present invention;

[0039] Figure 11 This is a schematic diagram of the three-dimensional structure of the positioning base assembly and the short pile steel bar assembly assembled according to the present invention;

[0040] Figure 12 For the present invention Figure 11 Schematic diagram of the cross-sectional structure.

[0041] In the figure: 1. Self-tensioning oblique anchor assembly; 101. Oblique anchor member; 1011. Tensioning head; 1012. Oblique anchor; 102. Trumpet-shaped tensioning head; 1021. Trumpet-shaped clamping head; 1022. Interval slots; 1023. Clamping protrusion; 1024. Positioning frame; 1025. Positioning hole; 1026. Connecting tube; 103. Reinforced outer frame; 1031. Reinforced outer steel bar; 1032. External steel bar stirrups; 104. Reinforced inner frame; 1041. Reinforced inner steel bar; 1042. Internal steel bar stirrups; 1043. Positioning plate;

[0042] 2. Middle connecting frame; 201. Middle ring seat; 202. Inclined plate; 203. Rectangular slot;

[0043] 3. Positioning base assembly; 301. Positioning annular seat; 302. Side stirrups;

[0044] 4. Short pile reinforcement assembly; 401. Short pile reinforcement; 402. External stirrups; 403. Internal stirrups; 404. Support arm;

[0045] 5. Bolts; 6. Foundation pit; 7. Side inclined pit; 8. Center pit. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Example:

[0048] See also Figure 1-12 , the present invention provides a technical solution:

[0049] A short-pile inclined anchor composite foundation for an iron tower comprises a foundation pit 6, a central pit 8 is provided at the center of the bottom of the foundation pit 6, and a plurality of side inclined pits 7 are evenly spaced on the sides of the bottom of the foundation pit 6;

[0050] The bottom of the side inclined pit 7 is inclined and expanded downward along the outer side of the bottom of the foundation pit 6.

[0051] The downwardly sloping bottom of the side slope pit 7 is designed to align with the trumpet-shaped tensioning head 102 of the self-tensioning angled anchor assembly 1. When the trumpet-shaped clamping head 1021 is expanded, it can contact the inner wall of the side slope pit 7 over a larger area, increasing friction and anchoring force, and improving the foundation's ability to resist horizontal loads and upward pull. This design also ensures more uniform force transmission when the self-tensioning angled anchor assembly 1 is subjected to stress, reducing localized stress concentration.

[0052] This design increases the contact area between the foundation and the soil, can better adapt to complex geological conditions, and improve the stability and bearing capacity of the foundation.

[0053] A self-tensioning inclined anchor rod assembly 1 is provided in the side inclined pit 7;

[0054] 1. Mechanical properties:

[0055] Uniform load distribution: The evenly spaced, self-tensioning, angled anchor assemblies 1 evenly support the loads from the tower. After concrete pouring, the concrete bonds the individual assemblies together. When vertical, horizontal, or uplift loads are applied to the tower, these loads are evenly transferred to the surrounding soil through the evenly spaced angled anchor assemblies. This avoids localized stress concentrations and prevents damage to the foundation structure caused by excessive local forces, thereby improving the overall bearing capacity and stability of the foundation.

[0056] Enhanced anti-overturning capability: The self-tensioning inclined anchor assemblies 1 work together horizontally to resist the potential overturning moment of the tower. Their even spacing ensures a balanced anti-overturning force in all directions, which is further enhanced after concrete pouring. The concrete connects the inclined anchor assemblies together, forming a stable structural system that effectively limits horizontal displacement and rotation of the foundation, significantly enhancing the overall anti-overturning performance of the structure.

[0057] Improved pullout resistance: The evenly spaced, self-tensioning, angled anchor assemblies 1 work together to resist uplift forces. When the tower is subjected to uplift forces, each angled anchor assembly, through its self-tensioning function, transfers the force to the surrounding soil. Because of their even spacing, the uplift forces are evenly distributed across each assembly. After concrete pouring, the concrete further strengthens the connection between the self-tensioning angled anchor assemblies 1 and the soil, improving overall pullout resistance and ensuring the foundation is protected from damage by uplift forces.

[0058] 2. Structural integrity:

[0059] Strengthening Structural Connections: After concrete is poured, the equally spaced, self-tensioning, angled anchor assemblies 1 fill the gaps between the assemblies, tightly connecting them. This connection enhances the structural integrity, allowing the individual assemblies to work together as a unified force-bearing unit. Instead of being isolated entities, the individual angled anchor assemblies work together through the bonding action of the concrete, enhancing the rigidity and strength of the overall structure.

[0060] Reducing uneven settlement: Equal spacing helps ensure relatively uniform bearing capacity across the foundation. After concrete is poured, it provides a certain degree of conditioning, further minimizing uneven settlement caused by variations in soil properties or uneven load distribution. Uniform settlement is crucial to the safe operation of the tower, preventing problems such as tower tilt and deformation caused by uneven settlement and extending the tower's service life.

[0061] The self-tensioning oblique anchor assembly 1 comprises a trumpet tensioning head 102 extending into the side oblique pit 7, a reinforced outer frame 103 and a reinforced inner frame 104 fixed to the upper end of the trumpet tensioning head 102, and an oblique anchor member 101 passing through the trumpet tensioning head 102 and the reinforced inner frame 104;

[0062] The trumpet tensioning head 102 includes a positioning frame 1024, a trumpet-shaped clamping head 1021 separated by a plurality of equally spaced slots 1022 at the bottom of the positioning frame 1024, and a connecting tube 1026 centrally located at the top of the positioning frame 1024;

[0063] The oblique anchor rod 101 includes a tensioning head 1011 that is narrow at the top and wide at the bottom, and an oblique anchor rod 1012 connected to the top of the tensioning head 1011 . The top of the oblique anchor rod 1012 extends through the trumpet tensioning head 102 and the reinforced inner frame 104 .

[0064] The structural design of the speaker tensioning head 102 facilitates installation. The positioning frame 1024 and connecting tube 1026 can be quickly connected to the central connecting frame 2 and the inclined anchor rod 1012, reducing the number of installation steps. The modular design of each component, such as the reinforced outer frame 103 and the reinforced inner frame 104, can be pre-assembled, improving construction efficiency and shortening the construction period.

[0065] The outer surface of the trumpet-shaped clamping head 1021 is provided with a plurality of clamping protrusions 1023;

[0066] The reinforced outer frame 103 includes a plurality of groups of circular and equally spaced reinforced outer steel bars 1031 and outer steel stirrups 1032 fixed at equal intervals to the outside of the plurality of groups of reinforced outer steel bars 1031;

[0067] The outer reinforcement bars 1031 are inserted into the corresponding positioning holes 1025 on the positioning frame 1024;

[0068] The reinforced inner frame 104 includes a plurality of circular and equally spaced reinforced inner steel bars 1041, inner steel stirrups 1042 fixed at equal intervals to the outside of the plurality of reinforced inner steel bars 1041, and positioning plates 1043 fixed to the tops of the plurality of reinforced inner steel bars 1041.

[0069] The oblique anchor rod 1012 extends through the reserved hole in the middle of the positioning plate 1043 , so that the reinforced inner frame 104 is centrally positioned inside the reinforced outer frame 103 .

[0070] The reinforced exoskeleton 103 and the reinforced endoskeleton 104, respectively composed of reinforced outer steel bars 1031 and outer steel stirrups 1032, and reinforced inner steel bars 1041 and inner steel stirrups 1042, protect and reinforce the oblique anchor rod 101, thereby improving the overall strength and rigidity of the self-tensioning oblique anchor rod assembly 1. The reinforced exoskeleton 103 is inserted into the positioning holes 1025 of the positioning frame 1024, while the reinforced endoskeleton 104 positions the oblique anchor rod 1012 via the positioning plate 1043, ensuring that the self-tensioning oblique anchor rod assembly 1 can work together when subjected to stress, thereby improving the reliability of the foundation.

[0071] The inclined anchor rod member 101 in the self-tensioning inclined anchor rod assembly 1 passes through the trumpet-shaped tensioning head 102 and the reinforced inner frame 104. When the bolt 5 is locked and fixed with the inclined anchor rod 1012, the tensioning head 1011 on the inclined anchor rod member 101 moves upward to open the trumpet-shaped clamping head 1021.

[0072] The clamping protrusion 1023 on the outside of the trumpet-shaped clamping head 1021 tightly clamps the inner wall of the side inclined pit 7, and utilizes the reaction force of the soil on the trumpet-shaped clamping head 1021 to anchor the self-tensioning inclined anchor rod assembly 1 in the foundation, thereby bearing the horizontal load and upward pulling force transmitted from the tower.

[0073] The self-tensioning inclined anchor assembly 1 can adjust parameters based on different geological conditions, such as the size of the trumpet-shaped clamping head 1021 and the length and diameter of the inclined anchor 1012, to accommodate varying soil and rock characteristics. In areas with soft soil or broken rock, the self-tensioning mechanism provides stronger anchoring force, ensuring foundation stability and expanding its application range.

[0074] Reliable self-tensioning anchors and a stable structural design reduce maintenance requirements due to anchor failure or structural damage. This component provides long-term effective operation, reduces maintenance frequency and costs, and improves the economical and reliable operation of the tower.

[0075] The middle connecting frame 2 between the tops of the self-tensioning oblique anchor rod assemblies 1 is fixed with bolts 5;

[0076] The middle connecting frame 2 includes a middle ring seat 201 located on the outside of the top of the central pit 8 and inclined plates 202 arranged at equal intervals on the sides of the middle ring seat 201. The inclined plates 202 are provided with rectangular slots 203.

[0077] The bottom of the inclined plate 202 is tightly attached to the top of the reinforced inner frame 104, and the inclined anchor rod 1012 extends through the corresponding rectangular slot 203. After the bolt 5 is locked and fixed with the inclined anchor rod 1012, the bolt 5 is supported on the top of the inclined plate 202, and the tensioning head 1011 stretches the trumpet-shaped clamping head 1021, so that the trumpet-shaped clamping head 1021 is clamped on the inner wall of the side inclined pit 7.

[0078] The central connecting frame 2 not only connects the self-tensioning oblique anchor rod assemblies 1 but also positions and supports the short pile reinforcement assembly 4, ensuring the precise relative spatial positioning of each assembly and more rationally applying force to the entire foundation structure. Furthermore, bolts 5 are securely fastened to the top of the oblique plate 202, further enhancing the reliability of the connection. This bolt 5 not only connects the self-tensioning oblique anchor rod assemblies 1 but also provides support for the tensioning head 1011, ensuring the self-tensioning function.

[0079] A positioning base assembly 3 is provided in the foundation pit 6 and is clamped between the top and outer sides of the self-tensioning oblique anchor assembly 1;

[0080] The positioning base assembly 3 includes several groups of positioning annular seats 301 arranged at equal intervals above and below, and side stirrups 302 fixed at equal intervals on the outside of the several groups of positioning annular seats 301. The diameter of the positioning annular seats 301 increases from top to bottom, and the positioning annular seats 301 are stuck on the outside of several groups of inclined anchor rods 1012.

[0081] The diameter of the positioning annular seat 301 of the positioning base assembly 3 increases from top to bottom, and is clamped on the outside of the inclined anchor rod 1012. It can position and restrain the self-tensioning inclined anchor rod assembly 1, preventing it from deflecting during construction and stress. It can also play a role in positioning the positioning base assembly 3 and the short pile steel bar assembly 4 when they are hoisted as a whole, preventing the positioning base assembly 3 and the short pile steel bar assembly 4 from deflecting as a whole, until the short pile steel bar assembly 4 is inserted vertically and centered into the center pit 8.

[0082] The positioning annular seat 301 is stuck on the outside of the inclined anchor rod 1012, which can accurately position the inclined anchor rod 1012, ensuring that the inclined anchor rod 1012 maintains the correct position during the concrete solidification process, preventing it from displacement or shaking, thereby ensuring the stability and accuracy of the entire composite foundation structure.

[0083] The diameter of the positioning annular seat 301 increases from top to bottom. This design, when combined with the concrete, allows the positioning base assembly 3 to work better with the inclined anchor rod 1012 and the surrounding concrete. The different diameters of the positioning annular seat 301 form a step-like structure in the concrete, increasing the contact area and friction with the concrete, making the connection between the positioning base assembly 3 and the concrete tighter, thereby enhancing the integrity of the entire composite foundation structure.

[0084] When the composite foundation is subjected to external forces, the positioning annular seat 301 can gradually distribute the force borne by the inclined anchor rod 1012 to the surrounding concrete through the annular seats of different diameters, thereby avoiding the occurrence of stress concentration. This can improve the bearing capacity of the composite foundation, enable the structure to better withstand various loads transmitted by the iron tower, and extend the service life of the foundation.

[0085] The short pile reinforcement assembly 4 is fixed to the topmost positioning annular seat 301 of the positioning base assembly 3 via the support arm 404 , thereby ensuring the verticality and stability of the short pile reinforcement assembly 4 .

[0086] The cooperation between the positioning base assembly 3 and the short pile reinforcement assembly 4 enables the foundation to evenly transfer force to the foundation soil when bearing vertical load, thereby improving the bearing capacity of the foundation.

[0087] A short pile steel bar assembly 4 is centrally provided inside the positioning base assembly 3;

[0088] The short pile reinforcement assembly 4 includes a plurality of groups of short pile reinforcement bars 401 that are circular and evenly spaced, inner stirrups 403 that are evenly spaced and fixed to the inner walls of the plurality of groups of short pile reinforcement bars 401, and outer stirrups 402 that are evenly spaced and fixed to the outer walls of the plurality of groups of short pile reinforcement bars 401.

[0089] Several groups of support arms 404 are connected to the outside of the inner stirrup 403 at equal intervals, and the support arms 404 are fixed on the positioning annular seat 301 at the top.

[0090] The bottom of the short pile steel bar assembly 4 passes through the middle connecting frame 2 and extends into the central pit 8, and the top of the short pile steel bar assembly 4 extends out of the foundation pit 6.

[0091] Under the action of the tower load, the short pile steel bar assembly 4 bears the vertical load and transfers it to the foundation soil at the bottom of the central pit 8; the self-tensioning inclined anchor rod assembly 1 bears the horizontal load and upward pull, and transfers the force to the deep soil through the interaction with the soil and concrete in the side inclined pit 7; the middle connecting frame 2 plays the role of connecting and fixing the various components, ensuring that the force can be effectively transmitted between the components, so that the entire foundation forms a collaborative working whole.

[0092] Concrete is poured into the foundation pit 6, the side inclined pits 7, and the center pit 8. After curing and forming, the concrete envelops and bonds the self-tensioning inclined anchor assembly 1, the central connecting frame 2, the positioning base assembly 3, and the short pile reinforcement assembly 4 into a single unit. This enveloping concrete enhances the stability and integrity of each component, further improving the foundation's bearing capacity and deformation resistance, enabling it to better adapt to the various load conditions of the tower.

[0093] Enhanced structural stability: The short pile steel bar assembly 4 passes through the middle connecting frame 2 and extends into the central pit 8, which enables the short pile steel bar assembly 4 to form a tighter connection with the middle connecting frame 2 and the concrete around the central pit 8, jointly bearing the load transmitted from the tower, improving the stability of the overall foundation structure, and reducing the possibility of uneven settlement.

[0094] Improve bearing capacity: This setting can make the short pile steel bar assembly 4 better exert its tensile and compressive properties, effectively transfer the load of the tower to the deep foundation, thereby improving the bearing capacity of the foundation, being able to withstand greater external forces and weight, and ensuring the safe operation of the tower under various working conditions.

[0095] Enhanced overall collaborative performance: The short pile reinforcement assembly 4 interacts with the central connecting frame 2 and the concrete within the central pit 8 to form a holistic force-bearing system. After the concrete is formed, the bonding and mechanical interlocking forces between them enable all components to work together to resist external forces, improving the integrity and seismic performance of the foundation structure.

[0096] Optimizes force distribution: This allows for a more even distribution of loads within the foundation structure, avoiding stress concentration. The short pile reinforcement assembly 4 extends centrally into the center pit 8, helping to balance forces in all directions, reducing the risk of structural damage due to localized excessive stress and extending the foundation's service life.

[0097] Complementary load transfer: The short pile rebar assembly 4 primarily transfers the tower's vertical load directly into the deep foundation, enhancing the foundation's vertical bearing capacity. The self-tensioning inclined anchor assembly 1, while bearing vertical loads, also prioritizes resisting horizontal and uplift loads. The combination of these two components optimizes load transfer in all directions, effectively improving the foundation's ability to withstand complex loads and avoiding foundation damage caused by a single component's inability to fully handle multiple loads.

[0098] Enhanced overall stability: Short pile rebar assemblies 4 penetrate the central connecting frame 2 and extend centrally into the central pit 8, stabilizing the foundation's central structure. Self-tensioning inclined anchor assemblies 1 are evenly spaced around the perimeter, reinforcing the foundation from all sides. Together, these two elements effectively support the foundation structure from the center to the perimeter, enhancing overall stability and reducing the possibility of uneven settlement and structural deformation.

[0099] Collaborative resistance to external forces: When subjected to external forces, the short pile rebar assembly 4 and the self-tensioning oblique anchor assembly 1 can work together. For example, when encountering horizontal external forces such as earthquakes, the self-tensioning oblique anchor assembly 1 can first resist part of the horizontal force through its own tensioning action. At the same time, the short pile rebar assembly 4 will also participate in resisting horizontal displacement due to its bonding with the concrete. The two work together to improve the foundation's seismic resistance. When subjected to upward pull forces, the self-tensioning properties of the self-tensioning oblique anchor assembly 1 play a major role, while the short pile rebar assembly 4 can also provide a certain amount of pull-out resistance through its interaction with the surrounding concrete, jointly ensuring the safety of the foundation.

[0100] Optimizing stress distribution: The rational arrangement of the short pile rebar assembly 4 and the self-tensioning inclined anchor assembly 1 achieves a more uniform stress distribution within the foundation. The short pile rebar assembly 4 adjusts stress in the central area, while the self-tensioning inclined anchor assembly 1 optimizes stress in the peripheral areas, avoiding stress concentration and thus improving the durability and reliability of the foundation structure.

[0101] The present invention also provides a construction method for a short-pile, inclined anchor rod composite foundation of an iron tower, which specifically comprises the following steps:

[0102] S1. Insert the self-tensioning oblique anchor rod assembly 1 into the side oblique pit 7. The self-tensioning oblique anchor rod assembly 1 needs to be prefabricated in advance and slide along the inner wall of the side oblique pit 7 into the side oblique pit 7.

[0103] Then, the middle connecting frame 2 is fixed between the top of the self-tensioning oblique anchor rod assembly 1 with bolts 5, that is, the middle connecting frame 2 is hoisted into the foundation pit 6, and at the same time, the top of the oblique anchor rod 1012 is extended through the corresponding rectangular slot 203 until the oblique anchor rod 1012 abuts against the outermost end of the rectangular slot 203. At this time, the middle ring seat 201 is located at the bottom of the foundation pit 6, and finally the bolts 5 are locked and fixed to the oblique anchor rod 1012;

[0104] S2. Fix the short pile steel bar assembly 4 on the positioning base assembly 3, and then hoist the positioning base assembly 3 and the short pile steel bar assembly 4 as a whole, so that the positioning base assembly 3 is stuck between the outer sides of the top of the self-tensioning oblique anchor rod assembly 1 (that is, the positioning annular seat 301 is stuck between the outer sides of the several groups of oblique anchor rods 1012), and the bottom of the short pile steel bar assembly 4 passes through the middle connecting frame 2 and extends into the center of the center pit 8;

[0105] S3, then pour concrete into the foundation pit 6, the side inclined pit 7 and the center pit 8. When pouring concrete, it is necessary to ensure that it is poured continuously at one time. It also needs to be poured in layers with a thickness of 0.5m;

[0106] Concrete can be poured into the side inclined pit 7 and the center pit 8 at the same time, and finally the foundation pit 6 can be poured;

[0107] During the pouring process, use an inserted vibrator to fully vibrate;

[0108] After pouring is completed and it is cured and formed, the top of the short pile steel bar 401 protrudes from the concrete, and the flange at the bottom of the tower is locked and fixed with the top of the short pile steel bar 401 using a stainless steel nut. The top of the short pile steel bar 401 is provided with an external thread that is screwed to the stainless steel nut.

[0109] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A composite foundation of short piles and inclined anchor rods for an iron tower, comprising a foundation pit, characterized in that: A central pit is provided in the center of the bottom of the foundation pit, and a plurality of side inclined pits are evenly distributed on the sides of the bottom of the foundation pit; A self-tensioning oblique anchor rod assembly is provided in the side oblique pit, and the middle connecting frame between the tops of the self-tensioning oblique anchor rod assembly is fixed with bolts. A positioning base assembly is provided in the foundation pit and is clamped between the outer sides of the tops of the self-tensioning oblique anchor rod assembly. A short pile steel bar assembly is centrally provided inside the positioning base assembly, and the bottom of the short pile steel bar assembly passes through the middle connecting frame and extends into the central pit, and the top of the short pile steel bar assembly extends out of the foundation pit.

2. The iron tower short pile oblique anchor composite foundation according to claim 1, characterized in that: The bottom of the side inclined pit is arranged to be inclined and expand downward along the outer side of the bottom of the foundation pit.

3. The iron tower short pile oblique anchor composite foundation according to claim 1, characterized in that: The self-tensioning oblique anchor rod assembly includes a trumpet tensioning head extending into the side oblique pit, a reinforced outer frame and a reinforced inner frame fixed to the upper end of the trumpet tensioning head, and an oblique anchor rod member passing through the trumpet tensioning head and the reinforced inner frame; The horn tensioning head comprises a positioning frame, a horn-shaped clamping head separated by a plurality of equally spaced slots at the bottom of the positioning frame, and a connecting tube centrally arranged at the top of the positioning frame; The oblique anchor rod member includes a tensioning head which is narrow at the top and wide at the bottom, and an oblique anchor rod connected to the top of the tensioning head. The top of the oblique anchor rod extends through the trumpet tensioning head and the reinforced inner frame.

4. The iron tower short pile oblique anchor composite foundation according to claim 3, characterized in that: The middle connecting frame includes a middle ring seat located outside the top of the central pit and inclined plates arranged at equal intervals on the sides of the middle ring seat, and the inclined plates are provided with rectangular slots; The bottom of the inclined plate is tightly attached to the top of the reinforced inner frame, and the inclined anchor rod extends through the corresponding rectangular slot. After the bolt and the inclined anchor rod are locked and fixed, the bolt is supported on the top of the inclined plate, and the tensioning head stretches the trumpet-shaped clamping head so that the trumpet-shaped clamping head is clamped on the inner wall of the side inclined pit.

5. The iron tower short pile oblique anchor composite foundation according to claim 3, characterized in that: The outer surface of the trumpet-shaped clamping head is provided with a plurality of clamping protrusions; The reinforced outer frame comprises a plurality of groups of circular and equally spaced reinforced outer steel bars and outer steel stirrups fixed at equal intervals on the outside of the plurality of groups of reinforced outer steel bars; The reinforced outer steel bars are inserted into corresponding positioning holes on the positioning frame; The reinforced inner frame includes a plurality of groups of circular and equally spaced reinforced inner steel bars, inner steel stirrups fixed at equal intervals to the outside of the plurality of groups of reinforced inner steel bars, and positioning plates fixed to the tops of the plurality of groups of reinforced inner steel bars; The oblique anchor rod extends through the reserved hole in the middle of the positioning plate, so that the reinforced inner frame is centrally positioned inside the reinforced outer frame.

6. The iron tower short pile oblique anchor composite foundation according to claim 3, characterized in that: The positioning base assembly includes several groups of positioning annular seats arranged at equal intervals above and below and side stirrups fixed at equal intervals on the outside of the several groups of positioning annular seats. The diameter of the positioning annular seats increases from top to bottom, and the positioning annular seats are clamped on the outside of several groups of oblique anchor rods.

7. The iron tower short pile oblique anchor composite foundation according to claim 6, characterized in that: The short pile reinforcement assembly includes a plurality of groups of short pile reinforcement bars that are circular and evenly spaced, inner stirrups that are evenly spaced and fixed to the inner walls of the plurality of groups of short pile reinforcement bars, and outer stirrups that are evenly spaced and fixed to the outer walls of the plurality of groups of short pile reinforcement bars. A plurality of groups of support arms are connected at equal intervals to the outside of the inner stirrups at the top, and the support arms are fixed on the positioning annular seat at the top.

8. A construction method for a short-pile, inclined anchor composite foundation for an iron tower according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Insert the self-tensioning oblique anchor rod assembly into the side oblique pit and fix the middle connecting frame to the top of the self-tensioning oblique anchor rod assembly with bolts; S2. Fix the short pile reinforcement assembly on the positioning base assembly, and then hoist the positioning base assembly and the short pile reinforcement assembly as a whole, so that the positioning base assembly is stuck between the top and outer sides of the self-tensioning oblique anchor assembly, and the bottom of the short pile reinforcement assembly passes through the middle connecting frame and extends into the center of the center pit; S3. Then pour concrete into the foundation pit, side inclined pits and center pit and wait for curing to take shape.

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