Claw type prestress assembly type concrete foundation and construction method thereof

Abstract

The invention relates to the technical field of constructional engineering prefabricated components, in particular to a claw-type prestressed fabricated concrete foundation and a construction method thereof.The claw-type prestressed fabricated concrete foundation comprises a center component, an even number of sub-claw components are evenly distributed on the center component in the circumferential direction, and the center component is connected with each sub-claw component to form a fabricated whole; the construction time is greatly shortened, and the construction efficiency is high. Corrugated pipes which are arranged side by side are embedded in the center component and each sub-claw component in a penetrating mode, after the center component and each sub-claw component are connected in a matched mode, all rows of corrugated pipes are in one-to-one correspondence and are coaxially arranged, and each corrugated pipe is internally provided with a pre-tightening assembly which is used for enhancing the overall tensile property of the component through tensioning. A vertically-arranged grouting hole is pre-embedded in the outer end of the corrugated pipe of each sub-claw component, the grouting holes are perpendicularly communicated with the corrugated pipes, and mortar is poured into the corrugated pipes through the grouting holes. Through bidirectional prestress tensioning of the pre-tightening assembly, the rigidity and integrity of the high-rise structure foundation are remarkably improved, and the capacity of resisting the bending moment of a power transmission and transformation tower, a photovoltaic support and a telecommunication base station foundation is enhanced.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building components, specifically a claw-type prestressed precast concrete foundation and its construction method. Background Technology

[0002] Traditional power transmission towers, photovoltaic supports, and telecommunications base station foundations mostly use on-site formwork and integrally cast concrete gravity foundations or pile foundations, which have problems such as large concrete consumption, heavy weight, long construction period, high requirements for construction site conditions, and significant environmental pollution.

[0003] Existing foundations for tall structures suffer from limitations in rigidity and integrity, resulting in significant bending moments for power transmission towers, photovoltaic supports, and telecommunications base station foundations. These foundations are unsuitable for tall structures with large bending moments and cannot facilitate rapid, efficient, and green construction. Furthermore, their structural bearing capacity and stability are poor in soft soil foundations, limiting their applicability. Summary of the Invention

[0004] The purpose of this invention is to provide a claw-type prestressed precast concrete foundation and its construction method to solve the problems mentioned in the background art. This invention, through the prefabrication of a central component and sub-claw components, significantly shortens the construction time and increases construction efficiency. Both the central component and each sub-claw component have pre-embedded corrugated pipes and their pre-tensioning components running through them, and mortar is injected into the corrugated pipes through grouting holes. The bidirectional prestressing tensioning of the pre-tensioning components significantly improves the stiffness and integrity of tall structural foundations, enhancing their ability to resist bending moments of power transmission towers, photovoltaic supports, and telecommunications base station foundations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a claw-type prestressed precast concrete foundation, comprising a central component, an even number of claw components evenly distributed along the circumference of the central component, a protruding cuboid connecting part at the corresponding connection between the central component and each claw component, and the central component and each claw component connected to form an assembled whole. The central component and each of the sub-claw components are permeated with pre-embedded corrugated pipes arranged in parallel. After the central component and each sub-claw component are connected, each row of corrugated pipes corresponds one-to-one and is coaxially arranged. Each corrugated pipe contains a pre-tensioning component that enhances the overall tensile strength of the component through tensioning. The outer end of the corrugated pipe of each sub-claw component is pre-embedded with a vertically arranged grouting hole, which is perpendicularly connected to the corrugated pipe. Mortar is injected into the corrugated pipe through the grouting hole. Through bidirectional prestressing tensioning of the pre-tensioning component, the stiffness and integrity of the high-rise structure foundation are significantly improved, and the bending moment of the foundation of the power transmission tower, photovoltaic support, and telecommunications base station approaches zero.

[0006] As a further embodiment of the present invention, the prestressing assembly includes prestressed tendons passing through each corrugated pipe, and the outer end of the corrugated pipe of the claw component is provided with an anchor plate for sealing. The anchor plate is a rectangular steel plate with a size 8mm-10mm larger than the diameter of the corrugated pipe. The anchor plate is provided with anchoring holes, and the two ends of the prestressed tendons pass through the anchoring holes respectively. The prestressed tendons are tensioned and tightened, and then anchored and fixed by the anchors at both ends and sealed with mortar.

[0007] As a further embodiment of the present invention, the prestressing tendon is a single 7-strand 1860 steel strand, with a nominal cross-sectional area of ​​140 mm² for each strand. 2 The theoretical weight per meter is 1101g, the diameter is φ15.2mm, and the steel strand is fitted with the anchor hole with a clearance.

[0008] As a further embodiment of the present invention, the mortar is a high-strength cement-based slurry containing an expansion agent to counteract the shrinkage of the cement substrate, and the high-strength cement-based slurry bonds with the pipe wall.

[0009] As a further embodiment of the present invention, the upper surface of the central component and the claw component connected to form an assembly is provided with embedded bolts, the top surface of the assembly is provided with a connecting steel plate, the connecting steel plate is provided with mounting holes that cooperate with the embedded bolts, and the mounting holes of the connecting steel plate are sequentially engaged with the embedded bolts and fastened by nuts.

[0010] As a further embodiment of the present invention, the connecting steel plate is composed of several rectangular steel plates spliced ​​together, with mounting holes on each rectangular steel plate located at the four corners, and the pre-embedded bolts are standard M20×150mm bolts.

[0011] As a further embodiment of the present invention, the central component is the central block of an octagonal prism, and the claw components are four evenly distributed. The height of the central block is equal to the height of the claw components, which is 800mm-1000mm. The claw components are T-shaped with protrusions on both sides of the outer end. The two protrusions are symmetrically arranged, and anchor pile connection holes are symmetrically provided on both protrusions. The anchor pile connection holes are used to connect micropiles in soft soil foundations. The bottom of the anchor pile connection hole is 150mm-200mm away from the bottom surface of the central component.

[0012] As a further embodiment of the present invention, the diameter of the corrugated pipe is φ60mm×2mm-φ80mm×2mm, and the distance between the axis of the corrugated pipe and the bottom surface of the central component is 150mm-200mm.

[0013] As a further embodiment of the present invention, the construction method of the claw-type prestressed precast concrete foundation is characterized by comprising the following steps: Step 1: The central component and the four claw components are prefabricated. Corrugated pipes and bolts are pre-embedded in the central component and the four claw components. Grouting holes are provided on the claw components for later use. The components are prefabricated in the factory, and the quality is stable and controllable.

[0014] Step 2: Excavate the foundation trench, lay simple mortar in the foundation trench, level and compact it, transport the central component and the claw components to the site and place them in order, and apply cement mortar to the cuboid connecting parts of the central component and the connecting surfaces of the claw components in sequence to form an assembled whole; low requirements for site conditions.

[0015] Step 3: Assemble the connecting steel plate on the top surface of the whole assembly, then insert the prestressing tendons into the corrugated pipe, install the anchor plate and anchor, and carry out prestressing tensioning; Step 4: After prestressing tensioning is completed, grout is injected into the corrugated pipe through the grouting hole; this greatly reduces the amount of concrete used, eliminates the need for on-site formwork and steel reinforcement, reduces reliance on skilled workers, and significantly saves production costs.

[0016] Step 5: Seal the exposed anchor plates and anchors with mortar to protect them; this provides sufficient prestress, greatly improving the rigidity and overall performance of the structure, and minimizing the foundation bending moment.

[0017] Step 6: Remove the connecting steel plate, apply structural adhesive to the bottom surface of the connecting steel plate, glue the connecting steel plate to the top surface of the assembly, and then tighten it with nuts and pre-tightening bolts. Step 7: Cover the entire assembly with soil.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention includes a central component, on which an even number of claw components are evenly distributed in the circumferential direction. A protruding cuboid connecting part is provided at the corresponding connection between the central component and each claw component. The central component and each claw component are connected to form an assembly. The prefabrication of the central component and claw components greatly shortens the construction time, improves construction efficiency, and enhances overall benefits. The foundation construction and the installation of its superstructure can be carried out simultaneously, greatly simplifying on-site procedures and accelerating construction speed.

[0019] The central component and each of the sub-claw components are permeated with pre-embedded corrugated pipes arranged in parallel. After the central component and each sub-claw component are connected, each row of corrugated pipes corresponds one-to-one and is coaxially arranged. Each corrugated pipe contains a pre-tensioning component that enhances the overall tensile strength of the component through tensioning. This bidirectional prestressing tensioning significantly improves the stiffness and integrity of the high-rise structural foundation, enhancing its ability to resist bending moments from power transmission towers, photovoltaic supports, and telecommunications base station foundations. Each sub-claw component has vertically embedded grouting holes at the outer end of its corrugated pipe, which are perpendicularly connected to the corrugated pipe. Grout is injected into the corrugated pipe through these holes, ensuring complete bonding between the prestressing tendons and the component, forming a permanent, integral load-bearing structure. It also has the following advantages: (1) By using the pre-tensioning method of on-site prestressed assembly of pre-tightened components, the foundation structure is made lightweight, construction is accelerated and performance is efficient, which greatly improves the overall integrity of the foundation.

[0020] (2) The prestressing tendon is a 7-strand 1860 steel strand, and the nominal cross-sectional area of ​​a single steel strand is 140 mm². 2 The theoretical weight per meter is 1101g, the diameter is φ15.2mm, and the steel strand is fitted with the anchor hole with a clearance.

[0021] (3) The mortar is a high-strength cement-based slurry containing an expansion agent to counteract the shrinkage of the cement substrate, and the high-strength cement-based slurry bonds with the pipe wall.

[0022] (4) The upper surface of the central component and the claw component connected to form an assembly is provided with embedded bolts. The top surface of the assembly is fastened to the connecting steel plate by the embedded bolts and nuts, which assists in the centering of the channel and further enhances the tensile strength and integrity of the top of the structure.

[0023] (5) Anchor pile connection holes are symmetrically provided on the two protrusions of the claw component to increase the contact area of ​​the foundation and facilitate the driving of micro piles in soft soil foundation to enhance the bearing capacity of the overall foundation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention; Figure 2 This is a front view of the overall assembly structure of the present invention; Figure 3 This is a schematic diagram of the central component structure of the present invention; Figure 4 This is a front view of the central component of the present invention; Figure 5 This is a schematic diagram of the splitting claw component structure of the present invention; Figure 6 This is a front view of the claw component of the present invention.

[0025] In the diagram: 1-Claw component, 101-Protrusion, 102-Anchor pile connection hole, 2-Connecting steel plate, 3-Central component, 301-Cuboid connection part, 4-Pre-tightening component, 401-Prestressing tendon, 402-Anchor plate, 403-Anchor, 404-Mortar sealing anchor, 5-Embedded bolt, 501-Nut, 6-Grouting hole, 7-Corrugated pipe. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0027] See appendix Figure 1 - Appendix Figure 4 A claw-type prestressed precast concrete foundation includes a central component 3, an even number of claw components 1 evenly distributed along the circumference of the central component, a protruding cuboid connection part 301 at the corresponding connection between the central component and each claw component, and the central component and each claw component are connected to form an assembled whole. See appendix Figure 5 - Appendix Figure 6 The central component 3 is the central block of an octagonal prism. There are four evenly distributed claw components. The height of the central block is equal to the height of the claw components, which is 800mm. The claw component 1 is T-shaped with protrusions 101 on both sides of the outer end. The two protrusions are symmetrically arranged. Anchor pile connection holes 102 are symmetrically provided on both protrusions. The anchor pile connection holes are used to connect micropiles in soft soil foundations. The bottom of the anchor pile connection hole is 150mm away from the bottom surface of the central component.

[0028] The central component 3 and each of the claw components 1 are permeated with pre-embedded corrugated pipes 7 arranged side by side. The diameter of the corrugated pipe is φ60mm×2mm, and the axis of the corrugated pipe is 150mm from the bottom surface of the central component.

[0029] After the central component is connected to each of the claw components, each row of corrugated pipes corresponds to and is coaxially arranged. Each corrugated pipe contains a pre-tensioning component 4, which enhances the overall tensile strength of the component through tensioning. The pre-tensioning component includes a prestressing tendon 401 threaded along each corrugated pipe. The prestressing tendon 401 is a 7-strand 1860 steel strand, and the nominal cross-sectional area of ​​a single steel strand is 140 mm². 2 Each meter has a theoretical weight of 1101g and a diameter of φ15.2mm.

[0030] The corrugated pipe of the claw-shaped component is equipped with an anchor plate 402 for sealing. The anchor plate is a rectangular steel plate with a size 10mm larger than the diameter of the corrugated pipe. The anchor plate has anchor holes, through which the two ends of the prestressing tendon pass. The diameter of the anchor holes is φ16mm, and the steel strand is clearance-fitted with the anchor holes. After tensioning, the prestressing tendon is anchored and fixed by the anchors 403 at both ends and sealed with mortar. Through bidirectional prestressing tensioning of the pre-tensioning component, the stiffness and integrity of the high-rise structure foundation are significantly improved, and the bending moment of the foundation of the power transmission tower, photovoltaic support, and telecommunications base station approaches zero.

[0031] Each corrugated pipe component has a vertically embedded grouting hole 6 at its outer end. The grouting hole is perpendicularly connected to the corrugated pipe 7. The size of the grouting hole is limited by the cross-sectional area of ​​the corrugated pipe. High-pressure grout is injected into the corrugated pipe through the grouting hole. The grout is a high-strength cement-based grout containing an expansion agent to counteract the shrinkage of the cementitious substrate. The high-strength cement-based grout adheres to the pipe wall, ensuring sufficient filling of the pipe with grout.

[0032] The upper surface of the central component 3 and the claw component 1 connected to form an assembly is provided with embedded bolts. The embedded bolts are standard M20×150mm bolts. The top surface of the assembly is provided with a connecting steel plate 2, which is composed of several rectangular steel plates spliced ​​together. The connecting steel plate is provided with mounting holes that cooperate with the embedded bolts. The mounting holes on each rectangular steel plate are opened at the four corners. The mounting holes of the connecting steel plate are sequentially engaged with the embedded bolts and tightened by nuts. Example 2

[0033] A construction method for claw-type prestressed precast concrete foundations, characterized by the following steps: Step 1: The central component 3 and the four claw components 1 are prefabricated. Corrugated pipes 7 and bolts 5 are pre-embedded in the central component and the four claw components. Corrugated pipes 7 are pre-embedded and arranged side by side in the central component and each claw component. Grouting holes 6 are provided on the claw components for later use. The grouting holes are vertically connected to the corrugated pipes.

[0034] Step 2: Excavate the foundation trench, lay simple mortar in the foundation trench, level and compact it, transport the central component and the claw component to the site and place them in order, connect the cuboid connecting part of the central component 3 with the claw component, and apply cement mortar to the connecting surface of the cuboid connecting part 301 of the central component with the connecting surface of the claw component in turn to form an assembled whole. Step 3: Assemble the overall top surface and install the connecting steel plate 2. The connecting steel plate can serve as an auxiliary channel centering tool. Then, insert the prestressing tendons into the corrugated pipe 7, install the anchor plate and anchor, and pass the prestressing tendons through the anchor holes at both ends for prestressing tensioning.

[0035] Step 4: After prestressing tensioning is completed, grout is injected into the corrugated pipe through grouting hole 6. Grouting hole 6 is perpendicularly connected to the corrugated pipe. The opening size of grouting hole 6 is limited by the cross-sectional size of the corrugated pipe. High-pressure grout is injected into the corrugated pipe through the grouting hole. The high-strength cement-based grout bonds with the pipe wall, ensuring the fullness of the grouting material inside the pipe.

[0036] Step 5: Use mortar to seal and protect the exposed anchor plate 402 and anchor 403; this provides sufficient prestress, improves the overall structural rigidity and performance, and minimizes the foundation bending moment.

[0037] Step 6: Remove connecting steel plate 2, apply structural adhesive to the bottom surface of the connecting steel plate, and glue the connecting steel plate to the top surface of the assembly. Then tighten it with nut 501 and pre-tightening bolt. The assembly is reliable and has strong overall integrity.

[0038] Step 7: Cover the entire assembly with soil.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A claw-type prestressed precast concrete foundation, characterized in that: Including a central component (3), an even number of claw components (1) are evenly distributed along the circumference of the central component, and a protruding cuboid connecting part (301) is provided at the corresponding connection between the central component and each claw component. The central component and each claw component are connected to form an assembly whole. The central component and each of the sub-claw components are connected by pre-embedded corrugated pipes (7) arranged in parallel. After the central component and each sub-claw component are connected, each row of corrugated pipes corresponds to each other and is coaxially arranged. Each corrugated pipe is equipped with a pre-tightening component (4) that enhances the overall tensile strength of the component by tensioning. Each sub-claw component has a vertically arranged grouting hole (6) pre-embedded at the outer end of the corrugated pipe. The grouting hole is vertically connected to the corrugated pipe, and mortar is injected into the corrugated pipe through the grouting hole.

2. The claw-type prestressed precast concrete foundation according to claim 1, characterized in that: The prestressing assembly (4) includes a prestressing tendon (401) passing through each corrugated pipe. The outer end of the corrugated pipe of the claw component is provided with an anchor plate (402) for sealing. The anchor plate is a rectangular steel plate with a size 8mm-10mm larger than the diameter of the corrugated pipe. The anchor plate is provided with anchor holes. The two ends of the prestressing tendon pass through the anchor holes respectively. The prestressing tendon is tensioned and tightened. After being anchored by the anchors (403) at both ends, it is fixed and sealed with mortar (404).

3. The claw-type prestressed precast concrete foundation according to claim 2, characterized in that: The prestressing tendon (401) is a single 7-strand 1860 steel strand, with a nominal cross-sectional area of ​​140 mm². 2 The theoretical weight per meter is 1101g, the diameter is φ15.2mm, and the steel strand is fitted with the anchor hole with a clearance.

4. The claw-type prestressed precast concrete foundation according to claim 2, characterized in that: The mortar is a high-strength cement-based slurry containing an expansion agent to counteract the shrinkage of the cement substrate, and the high-strength cement-based slurry bonds with the pipe wall.

5. The claw-type prestressed precast concrete foundation according to claim 3, characterized in that: The upper surface of the central component (3) and the claw component (1) connected to form an assembly is provided with embedded bolts (5). The top surface of the assembly is provided with a connecting steel plate (2). The connecting steel plate is provided with mounting holes that cooperate with the embedded bolts. The mounting holes of the connecting steel plate are successively engaged with the embedded bolts and tightened by nuts (501).

6. The claw-type prestressed precast concrete foundation according to claim 4, characterized in that: The connecting steel plate (2) is composed of several rectangular steel plates spliced ​​together. The mounting holes on each rectangular steel plate are opened at the four corners. The pre-embedded bolts are standard bolts of M20×150mm.

7. The claw-type prestressed precast concrete foundation according to claim 5, characterized in that: The central component (3) is the central block of an octagonal prism, and the claw components (1) are four evenly distributed. The height of the central block is equal to the height of the claw components, which is 800mm-1000mm. The claw components are T-shaped with protrusions (101) on both sides of the outer end. The two protrusions are symmetrically arranged, and anchor pile connection holes (102) are symmetrically provided on both protrusions. The anchor pile connection holes are used to connect micro piles in soft soil foundations. The bottom of the anchor pile connection hole is 150mm-200mm away from the bottom surface of the central component.

8. The claw-type prestressed precast concrete foundation according to claim 6, characterized in that: The corrugated pipe (7) has a diameter of φ60mm×2mm-φ80mm×2mm, and the distance between the axis of the corrugated pipe and the bottom surface of the central component is 150mm-200mm.

9. A construction method for a claw-type prestressed precast concrete foundation as described in claim 1 or 7, characterized in that: Includes the following steps: Step 1: The central component (3) and the four claw components (1) are prefabricated. Corrugated pipes (7) and bolts (5) are pre-embedded in the central component and the four claw components. Grouting holes (6) are provided on the claw components for later use. Step 2: Excavate the foundation trench, lay simple mortar in the foundation trench, level and compact it, transport the central component and the claw component to the site and place them in order, and apply cement mortar to the connection surface of the cuboid connecting part (301) of the central component (3) and the connecting surface of the claw component (1) in sequence to form an assembly whole. Step 3: Assemble the overall top surface and install the connecting steel plate (2), then insert the prestressing tendons into the corrugated pipe, install the anchor plate and anchor, and perform prestressing tensioning; Step 4: After completing the prestressing tensioning, grout is injected into the corrugated pipe through the grouting hole (6); Step 5: Seal and protect the exposed anchor plate (402) and anchor with mortar; Step 6: Remove the connecting steel plate (2), apply structural adhesive to the bottom surface of the connecting steel plate, glue the connecting steel plate to the top surface of the assembly, and then tighten it by screwing on the nuts and pre-tightening bolts; Step 7: Cover the entire assembly with soil.

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