Prestressed concrete fabricated foundation structure and construction method thereof

Abstract

The application discloses a prestressed concrete fabricated foundation structure and a construction method, wherein the foundation structure comprises a prefabricated reinforced concrete foundation structure component, an end surface connector and an anchoring tendon; a plurality of prefabricated reinforced concrete foundation structure components are spliced to form a foundation structure frame; the end surface splicing positions in the foundation structure frame are connected through the end surface connectors; and the corner or intersection joint connecting positions are connected through the anchoring tendons, are lapped and are connected through pouring of concrete. The prefabricated reinforced concrete foundation structure component obtained through the prefabricated production by adopting the prestressed technology and the centrifugal process and connected through the end surface connectors and the anchoring tendons greatly improves the crack resistance and the bending bearing capacity of the foundation structure, simultaneously reduces the weight of the prefabricated component, thereby has good rigidity and is beneficial to the force transmission of the upper structure.

Description

Technical Field

[0001] This invention relates to the field of building foundation design and construction technology, and in particular to a prestressed concrete prefabricated foundation structure and its construction method. Background Technology

[0002] Currently, the foundations of prefabricated buildings still rely on traditional cast-in-place methods, preventing the complete assembly of the foundation and resulting in a low rate of prefabricated construction. As a load-bearing component supporting the superstructure, the foundation's function is to transfer the load from the superstructure, along with its own weight, to the ground. Strip foundations, where the length is significantly greater than the width, are well-suited for low-rise buildings such as rural residences and self-built houses.

[0003] Traditional construction methods for foundation structures in existing technologies typically employ on-site formwork and casting. This process requires on-site surveying and layout, foundation trench excavation, on-site formwork erection, rebar tying, concrete pouring and curing, and finally backfilling. The entire construction process is complex, labor-intensive, time-consuming, inefficient, and susceptible to weather conditions. Currently, research on precast concrete components such as beams, slabs, and columns is increasing, but there is limited engineering application and research on prefabricated foundation structures. The construction of prefabricated foundation structures faces challenges such as high assembly technical difficulty and the inability to form reliable connections between components. Summary of the Invention

[0004] This invention addresses the aforementioned problems by proposing a prestressed concrete prefabricated foundation structure.

[0005] The technical means employed in this invention are as follows:

[0006] A prestressed concrete prefabricated foundation structure includes precast reinforced concrete foundation structural components, end face connectors, and anchor bars.

[0007] The precast reinforced concrete foundation structural components described in multiple sections are spliced ​​together to form the foundation structural frame;

[0008] The end faces of two adjacent precast reinforced concrete foundation structural members in the basic structural frame are connected by the end face connectors.

[0009] The corner or intersection joints of two or more adjacent precast reinforced concrete foundation structural members in the basic structural frame are each fixed with anchor bars, and the corner or intersection joints are connected by lapping the anchor bars and pouring concrete.

[0010] Furthermore, the precast reinforced concrete foundation structure component is provided with connecting sleeves at both ends; one end of the connecting sleeve is connected to the main reinforcement of the precast reinforced concrete foundation structure component, and the other end is provided with internal threads for connection to the end face connector or anchor bar.

[0011] Furthermore, the end face connector is a flange or a mechanical joint.

[0012] Furthermore, the flange includes two opposing flange end plates and a flange connecting rib plate disposed between the two flange end plates for connecting the flange end plates. The flange end plates are threadedly connected to the connecting sleeves on the corresponding side end faces of the precast reinforced concrete foundation structure members by bolts.

[0013] Furthermore, the main reinforcement of the precast reinforced concrete foundation structure component includes alternating prestressed main reinforcement and non-prestressed main reinforcement, wherein the prestressed main reinforcement is prestressed steel bar, steel bar, steel wire or steel strand.

[0014] Furthermore, the cross-sectional shape of the precast reinforced concrete foundation structure component is square, rectangular, polygonal, convex, concave, I-shaped, or T-shaped.

[0015] Furthermore, the precast reinforced concrete foundation structure components are solid or hollow components.

[0016] Furthermore, the anchor bar includes an anchor bar connection portion and an anchor bar bend portion;

[0017] The anchor bar connection and the anchor bar bend are set at a certain angle, so that the bends of multiple anchor bars at the corner or intersection point interweave to form a casting cage.

[0018] A construction method for the prestressed concrete prefabricated foundation structure described in this invention includes the following steps:

[0019] Step 1: Selection of components and accessories: Select the precast reinforced concrete foundation structure components, end face connectors and anchor bars according to the requirements of the design drawings, and list the specifications, lengths and quantities of the precast reinforced concrete foundation structure components, end face connectors and anchor bars required by the design.

[0020] Step 2, Factory Prefabrication: Based on the listed specifications, lengths, and quantities of prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars, the prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars are prefabricated in the factory. The anchor bars are cut to a fixed length and bent into hooks according to the drawings, and the other end of the anchor bar hooks is threaded.

[0021] Step 3, On-site treatment: The construction unit conducts on-site surveying and setting out according to the design drawings, excavates the foundation trench or levels the foundation, then pours a plain concrete cushion layer, and marks the installation positions of the precast reinforced concrete foundation structural components.

[0022] Step 4, Transportation and hoisting of components: Hoist the precast reinforced concrete foundation structure components to the marked positions, leaving enough space for the cast-in-place construction work at corners and intersections to connect with other components, and wait for installation;

[0023] Step 5, Assembly and Construction of Components: Precast reinforced concrete foundation structural components that need to be connected and extended using end face connectors are hoisted to the cross-sectional position of the precast reinforced concrete foundation structural components and assembled and connected using high-strength bolts to achieve splicing between adjacent precast reinforced concrete foundation structural components; and at the corners or intersections of the precast reinforced concrete foundation structural components, the connection of the nodes is achieved using a formwork-casting method; the formwork-casting method for achieving the connection of the nodes includes: screwing the threaded end of the anchor bar into the connecting sleeve on the end face of the precast reinforced concrete foundation structural component; after the anchor bars of different reinforced concrete foundation structural components at the corners and intersections are staggered and anchored, they are overlapped and tied; after overlapping and tying, side formwork is erected, concrete is poured and cured.

[0024] Step 6: Pouring of surface concrete: After the overlapping and binding are completed, the side formwork is erected, the concrete is poured and cured, and then the surface concrete is poured to make the foundation surface flat and connected as a whole, and the concrete is cured.

[0025] Furthermore, in step 5, when there is a need to anchor longitudinal steel bars into the column, the longitudinal steel bars of the column can be anchored into the node position and tied together to form a whole before the concrete is poured.

[0026] Compared with existing technologies, the prestressed concrete prefabricated foundation structure disclosed in this invention has the following beneficial effects: The prestressed concrete prefabricated foundation structure disclosed in this invention, due to the use of precast reinforced concrete foundation structural components obtained through prestressing technology and centrifugal processing, and connected by end-face connectors and anchor bars, greatly improves the crack resistance and flexural bearing capacity of the foundation structure. The inclusion of non-prestressed steel bars effectively improves the ductility of the cross-section, ensuring the safety of the cross-section and increasing the overall safety reserve of the foundation structure. Simultaneously, it reduces the weight of precast components. The foundation structure frame achieves a combination of prefabricated construction and cast-in-place construction, ensuring that the foundation structural components are connected as a whole, thus possessing good rigidity and facilitating force transmission to the superstructure. The setting method of the node anchor bars is more flexible, requiring no exposure, allowing for on-site assembly, resulting in higher construction efficiency, and the steel bars are less prone to corrosion. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the prestressed concrete prefabricated foundation structure disclosed in this invention;

[0028] Figure 2 This is a structural diagram of the precast reinforced concrete foundation structural component in the prestressed concrete prefabricated foundation structure disclosed in this invention.

[0029] Figure 3 This is a schematic diagram of the connection at the end face splice of the prestressed concrete prefabricated foundation structure disclosed in this invention.

[0030] Figure 4 This is a structural diagram of the flange in the prestressed concrete prefabricated foundation structure disclosed in this invention;

[0031] Figure 5 This is a schematic diagram of the connection at the corner or intersection of the prestressed concrete prefabricated foundation structure disclosed in this invention. The figure shows a schematic diagram of the connection at the corner of two structural components.

[0032] Figure 6 This is a schematic diagram of the connection at the corner or intersection of the prestressed concrete prefabricated foundation structure disclosed in this invention. The diagram shows the connection at the intersection of three structural components.

[0033] Figure 7 This is a schematic diagram of the connection at the corner or intersection of the prestressed concrete prefabricated foundation structure disclosed in this invention. The diagram shows the connection at the intersection of four structural components.

[0034] Figure 8 This is a structural diagram of the connecting sleeve in the prestressed concrete prefabricated foundation structure disclosed in this invention;

[0035] Figure 9 This is a schematic diagram of the connection at the corner or intersection of the prestressed concrete prefabricated foundation structure disclosed in this invention. The diagram shows the connection between the intersection of three structural components and the upper column.

[0036] Figure 10 This is a schematic diagram of the connection between the prestressed concrete prefabricated foundation structure and the pile foundation at the corner or intersection node of the prestressed concrete prefabricated foundation structure disclosed in this invention.

[0037] In the diagram: 1. Precast reinforced concrete foundation structural component; 10. Main reinforcement bar; 2. End face connector; 20. Flange; 200. Flange end plate; 201. Flange connecting rib; 3. Anchor bar; 30. Anchor bar connection part; 31. Anchor bar bend; 4. Connecting sleeve; 5. Pile foundation. Detailed Implementation

[0038] like Figure 1 The image shows the prestressed concrete prefabricated foundation structure disclosed in this invention, including a precast reinforced concrete foundation structure component 1, an end face connector 2, and an anchor bar 3.

[0039] like Figure 2 As shown, the precast reinforced concrete foundation structure component 1 is made of a steel cage and concrete. The steel cage includes multiple longitudinal main bars and several spiral bars surrounding the outside of the main bars. The longitudinal main bars, spiral bars and concrete are cast together in a steel mold, prestressed and centrifuged to form the main load-bearing structure.

[0040] The precast reinforced concrete foundation structural components 1 described in multiple sections are spliced ​​together to form a foundation structural frame;

[0041] like Figure 1 and Figure 3 As shown, the end faces of two adjacent precast reinforced concrete foundation structural members 1 in the foundation structural frame are connected by the end face connector 2. The end face splice refers to the quick connection between the two end faces of two precast reinforced concrete foundation structural members after they are set opposite each other.

[0042] like Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, at the corner or intersection joints of two or more adjacent precast reinforced concrete foundation structural members 1 in the foundation structural frame, each end face is fixed with the anchor bar 3. The corner or intersection joints are connected by lapping the anchor bars and pouring concrete. The corner or intersection joint refers to the connection between the rear ends of two precast reinforced concrete foundation structural members that are set vertically, or the connection between the rear ends of three or more precast reinforced concrete foundation structural members that are set at a certain angle. Figure 1 The connection points at corners or intersections include, for example: Figure 5 The connection between the two end faces of the two precast reinforced concrete foundation structural members shown is located at the intersection of the two sides of the foundation structural frame when they are on the same plane and set perpendicularly. Figure 6 The connection between the three end faces of the three precast reinforced concrete foundation structural members shown is located on the same plane and vertically arranged (the intersection point located in the middle of one side of the foundation structural frame), and as shown in the figure. Figure 7The four precast reinforced concrete foundation structural members shown are located on the same plane and vertically arranged. At the connection points between their four end faces (located at the central cross-shaped connection point of the foundation structural frame), specifically at the corners and intersections of the precast reinforced concrete foundation structural members, the connection can be achieved by lapping anchor bars between the members, followed by formwork erection and in-situ casting and leveling. The specific method is as follows: anchor bars are pre-fabricated to a predetermined length according to standard specifications; one end of the anchor bar is upset and hot-rolled to form threads; then the anchor bar is screwed into the connecting sleeve on the end face of the member, and the anchor bar is tied and lapped. At corners and intersections, the longitudinal main reinforcement of the column can also be anchored into the in-situ cast-in-place joint between the members and tied and lapped, before pouring concrete to form a whole.

[0043] The prestressed concrete prefabricated foundation structure disclosed in this invention forms a foundation frame that can be used as a strip foundation or foundation beam for a building. It is supported by walls and columns. This prestressed concrete prefabricated foundation structure utilizes prefabricated reinforced concrete foundation components produced using prestressing technology and centrifugal processing, connected by end-face connectors and anchor bars. This significantly improves the crack resistance and flexural bearing capacity of the foundation structure. Simultaneously, it reduces the weight of the prefabricated components. The foundation frame combines prefabricated construction with cast-in-place construction, ensuring that the foundation components are connected as a whole, thus possessing good rigidity and facilitating force transmission to the superstructure.

[0044] Furthermore, compared to existing cast-in-place strip foundation construction methods, which suffer from drawbacks such as complex procedures, large workload, long cycle, low efficiency, and susceptibility to weather conditions, this invention utilizes prestressed technology and centrifugal molding to produce precast prestressed concrete prefabricated foundation structural components. Leveraging the advantages of prefabrication and streamlined production, these components are applied to foundation engineering. Simultaneously, the use of prestressed technology significantly improves the crack resistance and load-bearing capacity of the components, while prefabricated construction and installation increase the building's assembly rate. Components can be connected via end-face connectors followed by formwork and cast-in-place concrete filling, effectively shortening the construction cycle. Moreover, prefabricated construction combines mechanical construction with manual assistance, effectively reducing workload and the number of workers required. The entire construction site is civilized, environmentally friendly, and clean, facilitating management and supervision.

[0045] Furthermore, the precast reinforced concrete foundation structure component 1 is provided with connecting sleeves 4 at both ends; such as Figure 8As shown, one end of the connecting sleeve 4 is connected to the main reinforcement 10 of the precast reinforced concrete foundation structure component 1, and the other end is provided with an internal thread for connection to the end face connector 2 or the anchor bar 3. By setting the connecting sleeve, when it is necessary to tension the prestressed main reinforcement, the prestressed main reinforcement can be easily connected to the tensioning device. After the precast reinforced concrete foundation structure component is formed, during the splicing process of the foundation structure frame, the connecting sleeve can be easily connected to the end face connector or the anchor bar.

[0046] The end face connector 2 is a flange 20 or a mechanical joint. In this embodiment, as... Figure 3 and Figure 4 As shown, the end face connector adopts a flange structure. The flange 20 includes two opposing flange end plates 200 and a flange connecting rib 201 disposed between the two flange end plates 200 for connecting the flange end plates 200. An operating space is provided between the two flange end plates. The flange end plates have multiple through holes corresponding to the connecting sleeves on the end faces of the precast reinforced concrete foundation structure components. Bolts can be inserted into the through holes within the operating space between the two flange end plates, so that the flange end plate 200 is threadedly connected to the prestressed connecting sleeve 4 on the corresponding side of the end face of the precast reinforced concrete foundation structure component 1 through the bolts, thereby realizing the rapid connection of the end faces of the two precast reinforced concrete foundation structure components. The precast reinforced concrete foundation structure components can be connected by flange connection or quick mechanical joint connection, and then the components are connected into a whole by formwork, cast-in-place leveling, so as to ensure the integrity of the structure and prevent the steel structure at the joint position from rusting, thus ensuring its connection performance.

[0047] like Figure 6 As shown, the anchor bar 3 includes an anchor bar connection part 30 and an anchor bar bend part 31; the anchor bar connection part 30 and the anchor bar bend part 31 are set at a certain angle, so that the anchor bar bend parts of multiple anchor bars at the corner or intersection connection point interweave to form a casting cage. Specifically, the anchor bars can be pre-processed to a fixed length according to standard specifications, and then one end of the anchor bar is upset and hot-rolled to form an anchor bar connection part with threads. The anchor bar connection part can be screwed into the connecting sleeve on the end face of the component, and then the anchor bar bend parts are tied and overlapped to form a casting cage, and concrete is poured at the casting cage to form the overall foundation structure frame.

[0048] Furthermore, the main reinforcement 10 of the precast reinforced concrete foundation structure component 1 includes alternating prestressed and non-prestressed main reinforcements, wherein the prestressed main reinforcements are prestressed steel bars, steel rods, steel wires, or steel strands. Using alternating prestressed and non-prestressed main reinforcements ensures that the precast reinforced concrete foundation structure component possesses good crack and bending resistance, further improving the overall performance of the foundation structure frame.

[0049] Furthermore, the cross-sectional shape of the precast reinforced concrete foundation structure component 1 is square, rectangular, polygonal, convex, concave, I-shaped, or T-shaped, and the precast reinforced concrete foundation structure component 1 is either a solid or hollow component, so as to meet the requirements of different load characteristics of the upper part of the foundation structure frame. When the precast reinforced concrete foundation structure component has an inner hole at the center of its cross-section, the size of the inner hole can be controlled by centrifugal technology. The size of the inner hole can be changed by the factory's control over the material placement and the frequency adjustment of the centrifuge, thereby reducing the weight of the component and adjusting the load-bearing capacity of the component cross-section. The reinforcement of the steel cage of different types of precast reinforced concrete foundation structure components can be adjusted in conjunction with the cage weaving process of the automatic roll welding cage weaving machine.

[0050] like Figure 9 The diagram shows the connection between the corner or intersection node of the prestressed concrete prefabricated foundation structure disclosed in this application and the upper column. The upper column is set on the upper part of the prestressed concrete prefabricated foundation structure, and the lower end face of the upper column is also provided with anchor bars. The anchor bars on the lower end face of the upper column are tied and overlapped with the anchor bars at the corner or intersection node of the prestressed concrete prefabricated foundation structure and then connected by pouring concrete.

[0051] like Figure 10 The diagram shows the connection between the corner or intersection node of the prestressed concrete prefabricated foundation structure disclosed in this application and the pile foundation. The foundation pile is set at the bottom of the prestressed concrete prefabricated foundation structure, and the end face of the pile foundation is also provided with anchor bars. The anchor bars on the end face of the pile foundation are tied and overlapped with the anchor bars at the corner or intersection node of the prestressed concrete prefabricated foundation structure and then connected by pouring concrete.

[0052] A construction method for the prestressed concrete prefabricated foundation structure described in this invention includes the following steps:

[0053] Step 1: Selection of components and accessories: Select the precast reinforced concrete foundation structure components, end face connectors and anchor bars according to the requirements of the design drawings, and list the specifications, lengths and quantities of the precast reinforced concrete foundation structure components, end face connectors and anchor bars required by the design.

[0054] Specifically, based on the design drawings of the foundation frame, select the corresponding precast reinforced concrete foundation structural components, end face connectors, and anchor bars. List the specifications, lengths, and quantities of the precast reinforced concrete foundation structural components required for the design. A foundation frame may require one or more precast reinforced concrete foundation structural components. Specifications include the cross-sectional shape (square, rectangular, polygonal, convex, concave, I-shaped, or T-shaped), cross-sectional dimensions, and cross-sectional form (solid or hollow). List the specifications, lengths, and quantities of each type of structural component. Determine the specifications, lengths, and quantities of the end face connectors and anchor bars based on the structural components. The specifications of the end face connectors are determined by selecting the specifications of the precast reinforced concrete foundation structural components. The specifications, lengths, and quantities of the anchor bars are also determined and calculated by selecting the specifications of the precast reinforced concrete foundation structural components, and then compiled and listed.

[0055] Step 2, Factory Prefabrication: Based on the listed specifications, lengths, and quantities of prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars, the prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars are prefabricated in the factory. The anchor bars are cut to a fixed length and bent into hooks according to the drawings, and the other end of the anchor bar hooks is threaded.

[0056] Specifically, based on the listed statistical requirements for precast reinforced concrete foundation structural components, end face connectors, and anchor bars, the precast reinforced concrete foundation structural components, end face connectors, and anchor bars are prefabricated and produced in the factory. Among them, the anchor bars are cut to a fixed length and bent into hooks according to the drawings, and the other end of the anchor bar hook is threaded. The prestressed concrete prefabricated foundation structural components can be produced in fixed lengths according to the length and width of the building. The length of a single component can be 3m, 6m, 9m, 12m, or 15m. They are prestressed by pre-tensioning and compacted by centrifugal process. The prestressed concrete prefabricated foundation structural components include longitudinally arranged main bars, which are composed of prestressed and non-prestressed steel bars. The prestressed steel bars can be prestressed steel bars, steel bars, steel wires, or steel strands. The main bars are formed into a steel cage by several external spiral bars. The main bars, spiral bars, and concrete are cast together in a steel mold, prestressed, and centrifugally formed as the main load-bearing structure.

[0057] Step 3, On-site treatment: The construction unit conducts on-site surveying and setting out according to the design drawings, excavates the foundation trench or levels the foundation, then pours a plain concrete cushion layer, and marks the installation positions of the precast reinforced concrete foundation structural components.

[0058] Step 4, Transportation and hoisting of components: Hoist the precast reinforced concrete foundation structure components to the marked positions, leaving enough space for the cast-in-place construction work at corners and intersections to connect with other components, and wait for installation;

[0059] Step 5, Assembly and Construction of Components: Precast reinforced concrete foundation structural components that need to be connected and extended using end face connectors are hoisted to the cross-sectional position of the precast reinforced concrete foundation structural components and assembled and connected using high-strength bolts to achieve splicing between adjacent precast reinforced concrete foundation structural components; and at the corners or intersections of the precast reinforced concrete foundation structural components, the connection of the nodes is achieved using a formwork-casting method; the formwork-casting method for achieving the connection of the nodes includes: screwing the threaded end of the anchor bar into the connecting sleeve on the end face of the precast reinforced concrete foundation structural component; after the anchor bars of different reinforced concrete foundation structural components at the corners and intersections are staggered and anchored, they are overlapped and tied; after overlapping and tying, side formwork is erected, concrete is poured and cured.

[0060] Step 6: Pouring of surface concrete: After the overlapping and binding are completed, the side formwork is erected, the concrete is poured and cured, and then the surface concrete is poured to make the foundation surface flat and connected as a whole, and the concrete is cured.

[0061] The prestressed concrete prefabricated foundation structure obtained using the construction method disclosed in this invention significantly improves the crack resistance and flexural bearing capacity of the foundation structure and reduces the weight of the prefabricated components due to the use of prestressing technology and centrifugal processing for prefabrication of the prestressed concrete prefabricated foundation structure components. Furthermore, the length of individual components can be adjusted as needed, making the prefabrication method quite flexible. At corners and intersections, a combination of prefabrication and cast-in-place construction techniques is used. Components are connected via flanges or quick mechanical connections, forming an integrated foundation structure and achieving prefabricated connection of the foundation structure. Components can also be connected via end-face connectors followed by formwork and cast-in-place concrete filling, effectively shortening the construction cycle. The combination of prefabricated foundation structure assembly construction and cast-in-place construction ensures that the foundation structure components are connected as a whole, thus possessing good rigidity and facilitating force transmission to the superstructure. The cross-sectional shape, reinforcement and length of basic structural components can be adjusted according to design requirements. The factory prefabrication method is flexible and can meet the design of most low-rise building foundations. In addition, the assembly construction can combine mechanical construction with manual assistance, which can effectively reduce the amount of work and the number of workers. The entire construction site is civilized, environmentally friendly and clean, which is conducive to management and supervision.

[0062] Currently, most precast concrete foundation designs in the industry employ conventional precast concrete component production methods. Components are cast in molds and then cured. However, this method results in concrete components with lower strength grades, lack of prestressing in the cross-section, and a tendency to crack, limiting the production length of individual sections. The prestressed concrete precast foundation structure components obtained through the construction method disclosed in this invention utilize high-strength or ultra-high-strength concrete as raw material for precast production. This significantly improves the crack resistance of the foundation structure components and greatly increases the length of each precast section. Simultaneously, the increased load-bearing capacity allows the foundation structure to withstand greater superstructure loads, providing a certain safety margin.

[0063] Meanwhile, existing precast concrete strip foundations, due to limitations in the length of individual sections, typically have reinforcing bars pre-reserved at both ends during production for later anchoring into connection nodes. Since precast foundation components are usually stored in open-air yards after curing, the pre-reserved reinforcing bars are prone to corrosion due to prolonged exposure, hindering later connections. Furthermore, the length of the pre-reserved reinforcing bars is limited by component production and cannot be adjusted according to design requirements.

[0064] In the prestressed concrete prefabricated foundation structure components obtained by the construction method disclosed in this invention, the anchoring steel bars do not need to be exposed along with the foundation structure components. They are separated from the components, avoiding steel bar corrosion. When connection of nodes is required, the anchoring steel bars are extended using sleeves pre-installed during production. One end of the anchoring steel bar is threaded and screwed into the sleeve, while the other end is lengthened and bent according to design requirements, allowing the anchoring steel bars at the end faces of each component to overlap and form a whole. Later, concrete is poured and cured at the connection node to integrate the foundation structure components. The installation efficiency of the anchoring steel bars is high, and the pre-installed length is highly flexible, allowing for pre-processing and production according to engineering design needs, resulting in better integration of foundation structure components and significantly improved stability of connection nodes.

[0065] The basic structural components can also be connected by flanges or quick mechanical joints, which are reliable and can be installed directly on the construction site. The installation efficiency is high, and there is no need to wait for concrete pouring and curing, which greatly shortens the construction cycle.

[0066] Furthermore, in step 5, when longitudinal reinforcing bars need to be anchored into the column, the longitudinal reinforcing bars of column 5 can be anchored into the node position and tied together before the concrete is poured. In addition, prestressed concrete prefabricated foundation structure components can be produced in fixed lengths according to the length and width of the building. The length of a single component can be 3m, 6m, 9m, 12m, or 15m. When the required component length is non-standardized, it can be connected by flange connection or quick mechanical connection. Formwork is erected at the connection node before concrete is poured to prevent corrosion of the steel structure at the node position. When this structural component is used as a building foundation beam, it can be assembled with prestressed concrete piles.

[0067] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prestressed concrete prefabricated foundation structure, characterized in that: This includes precast reinforced concrete foundation structural components, end face connectors, and anchor bars; The precast reinforced concrete foundation structural components described in multiple sections are spliced ​​together to form the foundation structural frame; The end faces of two adjacent precast reinforced concrete foundation structural members in the basic structural frame are connected by the end face connectors. The corner or intersection joints of two or more adjacent precast reinforced concrete foundation structural members in the basic structural frame are each fixed with anchor bars, and the corner or intersection joints are connected by tying and lapping the anchor bars and pouring concrete. The precast reinforced concrete foundation structure component is provided with connecting sleeves at both ends; one end of the connecting sleeve is connected to the main reinforcement of the precast reinforced concrete foundation structure component, and the other end is provided with internal threads for connection to the end face connector or anchor bar. The anchor bar includes an anchor bar connection part and an anchor bar bend part; The anchor bar connection and the anchor bar bend are set at a certain angle, so that the bends of multiple anchor bars at the corner or intersection point interweave to form a casting cage.

2. The prestressed concrete prefabricated foundation structure according to claim 1, characterized in that: The end face connector is a flange.

3. The prestressed concrete prefabricated foundation structure according to claim 2, characterized in that: The flange includes two oppositely arranged flange end plates and a flange connecting rib plate disposed between the two flange end plates for connecting the flange end plates. The flange end plates are threadedly connected to the connecting sleeves on the end faces of the precast reinforced concrete foundation structure members on the corresponding sides by bolts.

4. The prestressed concrete prefabricated foundation structure according to claim 3, characterized in that: The main reinforcement of the precast reinforced concrete foundation structure includes alternating prestressed main reinforcement and non-prestressed main reinforcement, wherein the prestressed main reinforcement is prestressed steel bar, steel bar, steel wire or steel strand.

5. The prestressed concrete prefabricated foundation structure according to claim 4, characterized in that: The cross-sectional shape of the precast reinforced concrete foundation structure component is rectangular, convex, concave, I-shaped, or T-shaped.

6. The prestressed concrete prefabricated foundation structure according to claim 5, characterized in that: The precast reinforced concrete foundation structure components are solid or hollow components.

7. A construction method for the prestressed concrete prefabricated foundation structure according to any one of claims 1 to 6, characterized in that: Includes the following steps: Step 1: Selection of components and accessories: Select the precast reinforced concrete foundation structure components, end face connectors and anchor bars according to the requirements of the design drawings, and list the specifications, lengths and quantities of the precast reinforced concrete foundation structure components, end face connectors and anchor bars required by the design. Step 2, Factory Prefabrication: Based on the listed specifications, lengths, and quantities of prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars, the prefabricated reinforced concrete foundation structural components, end face connectors, and anchor bars are prefabricated in the factory. The anchor bars are cut to a fixed length and bent into hooks according to the drawings, and the other end of the anchor bar hooks is threaded. Step 3, On-site treatment: The construction unit conducts on-site surveying and layout, excavation of foundation trenches or leveling of the foundation according to the design drawings, then pours plain concrete cushion layer, and marks the installation positions of precast reinforced concrete foundation structural components. Step 4, Transportation and hoisting of components: Hoist the precast reinforced concrete foundation structure components to the marked positions, leaving enough space for the cast-in-place construction work at corners and intersections to connect with other components, and wait for installation; Step 5, Assembly and Construction of Components: Precast reinforced concrete foundation structural components that need to be connected and extended using end face connectors are hoisted to the cross-sectional position of the precast reinforced concrete foundation structural components and assembled and connected using high-strength bolts to achieve splicing between adjacent precast reinforced concrete foundation structural components; and at the corners or intersections of the precast reinforced concrete foundation structural components, the connection of the nodes is achieved using a formwork-casting method; the formwork-casting method for achieving the connection of the nodes includes: screwing the threaded end of the anchor bar into the connecting sleeve on the end face of the precast reinforced concrete foundation structural component; after the anchor bars of different reinforced concrete foundation structural components at the corners and intersections are staggered and anchored, they are overlapped and tied; after overlapping and tying, side formwork is erected, concrete is poured and cured. Step 6: Pouring of surface concrete: After the overlapping and binding are completed, the side formwork is erected, the concrete is poured and cured, and then the surface concrete is poured to make the foundation surface flat and connected as a whole, and the concrete is cured.

8. The construction method for prestressed concrete prefabricated foundation structure according to claim 7, characterized in that: In step 5, when there are longitudinal steel bars that need to be anchored into the column, the longitudinal steel bars of the column are anchored into the node position and tied together to form a whole before the concrete is poured.

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