FRP composite rib recycled concrete prefabricated pier column-foundation socket joint and construction method

Abstract

The invention relates to an FRP composite rib recycled concrete prefabricated pier column-foundation socket joint and a construction method, and belongs to the technical field of structural engineering. Comprising a prefabricated recycled concrete pier column and a recycled concrete foundation, a horizontal resistance device embedded in the recycled concrete foundation, an embedded metal corrugated pipe and UHPC grouting socket and spigot joint are combined and connected, and the connection reliability and anti-seismic safety of the assembly type joint are guaranteed. The prefabricated recycled concrete pier column is composed of a longitudinal FRP composite bar and a stirrup, and the recycled concrete foundation is composed of a horizontal resistance device, a pre-buried metal corrugated pipe, a reserved grouting pressure pipe, a reserved inserting groove, a foundation longitudinal steel bar and a foundation stirrup. The longitudinal FRP composite bars of the pier column and the metal corrugated pipe are connected through grouting to resist the drawing force of a joint area, the horizontal force is jointly borne by concrete and the horizontal resistance device, the horizontal resistance device bears most of the horizontal force around a foundation socket groove, and the pressure damage to the concrete of a bearing platform is reduced.

Description

Technical Field

[0001] The invention relates to a prefabricated pier column-foundation structure, in particular to an FRP composite reinforcement recycled concrete prefabricated pier column-foundation socket node and a construction method, belonging to the technical field of structural engineering. Background Art

[0002] The strategy of building a strong transportation nation aims to promote the construction of transportation infrastructure, technological innovation and management optimization to achieve efficient, convenient, safe and green development of transportation. As an infrastructure node project, bridges have huge construction needs. Traditional bridge construction adopts on-site casting, which has problems such as long construction period, large environmental pollution and difficult to control construction quality. The introduction of prefabrication and assembly technology can solve the problems of long construction period, reduce environmental pollution and ensure the quality of components. Prefabrication and assembly use FRP composite bars and UHPC with the advantages of high strength and high durability, which are particularly suitable for bridge construction in offshore areas, lakes and swamps, high-cold areas, urban roads and areas with harsh environmental protection.

[0003] However, my country is located between the Pacific Rim seismic belt and the Eurasian seismic belt, with high seismic activity, which has a great impact on traffic bridges. Structural nodes are the hubs of various components and belong to the key design optimization area. The prefabricated and assembled structural node connection structure of the bridge is the weakest part. A pier-foundation node connection structure and construction process suitable for strong earthquake zones should be proposed to meet the seismic performance of actual bridge projects in strong earthquake zones. The seismic performance of the prefabricated and assembled structural node structure of the lower part of the bridge currently proposed is still relatively weak, and it can no longer serve the future traffic road business well, especially for structures located in strong earthquake zones. There is a great demand for prefabricated structural node connections with excellent "safety" and "seismic performance" to serve strong earthquake zones. The demand for prefabricated and assembled structural node connection structures of bridges in strong earthquake zones is coming.

[0004] In the prefabricated pier node connection technology, the socket connection has the advantages of simple connection, strong adaptability and reduced on-site construction. However, the traditional pier-foundation socket node structure connection usually requires a larger socket depth to meet the seismic requirements. For example, CN107869150A discloses a prefabricated assembly column and reinforced concrete foundation connection structure and construction method, and CN110284516A discloses a lightweight prefabricated assembled concrete slab column foundation and construction method, which results in a large range of longitudinal reinforcement of the pedestal being interrupted, causing its bending resistance to decrease. At the same time, in order to meet the pedestal's shear resistance and high seismic resistance performance, the overall size of the pedestal is made larger, which is not conducive to the structural economy.

[0005] Therefore, it is urgent to propose a new type of assembled pier-foundation socket-type node structure to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned defects of the above-mentioned prior art, the present invention proposes an FRP composite reinforcement recycled concrete prefabricated assembly pier-foundation socket node and construction method, which can well meet the seismic performance of the connection node, and has the advantages of simple construction process, green solid waste recycling, corrosion resistance, low socket depth and high ductility, and provides a new solution for the prefabricated pier-foundation node connection design in the field of bridge engineering.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The FRP composite reinforced recycled concrete prefabricated assembly pier-foundation socket node is composed of a prefabricated recycled concrete pier and a recycled concrete foundation. The prefabricated recycled concrete pier is inserted into the foundation hole groove of the recycled concrete foundation. The prefabricated recycled concrete pier includes longitudinal FPR composite reinforcement of the pier body and pier body stirrups; the recycled concrete foundation includes a pre-buried metal bellows, a pre-buried grouting high-pressure pipe and a horizontal force resistance device; the longitudinal FPR composite reinforcement of the pier body is pre-buried around the interior of the prefabricated recycled concrete pier, and the part of the bottom extending from the prefabricated pier is inserted into the pre-buried metal bellows, and high-strength concrete UHPC is poured inside the pre-buried metal bellows; the pre-buried metal bellows is pre-buried in the bottom of the recycled concrete foundation socket, and the top surface of the metal bellows slurry outlet at its upper end is flush with the bottom surface of the recycled concrete foundation socket; the side wall of the pre-buried metal bellows is connected to a pre-buried grouting high-pressure pipe extending to the upper surface of the recycled concrete foundation; the horizontal force resistance device includes an upper T-shaped longitudinal steel beam, a lower cross-shaped longitudinal steel beam, The stress-bearing steel plate and the middle reinforced connecting steel plate; the horizontal force resistance device is buried around the reserved socket of the recycled concrete foundation, located below the foundation longitudinal steel bars and foundation stirrups inside the recycled concrete foundation, and welded with the foundation longitudinal steel bars and foundation stirrups; the stress-bearing steel plate is welded to one end of the T-shaped longitudinal steel beam and the cross-shaped longitudinal steel beam, and the stress-bearing steel plate extends around the socket of the recycled concrete foundation and is limited to the four sides of the bottom of the prefabricated recycled concrete pier column and the four sides of the foundation socket; a stress-bearing steel plate support is welded between the back of the stress-bearing steel plate and the T-shaped longitudinal steel beam; the other ends of the T-shaped longitudinal steel beam and the cross-shaped longitudinal steel beam are welded with anchoring steel plates; multiple stress-bearing steel plates and multiple anchoring steel plates are welded together through horizontal connecting steel plates and vertical connecting steel plates; the middle reinforced connecting steel plate is provided with a T-shaped hole and a cross-shaped hole, the T-shaped longitudinal steel beam and the cross-shaped longitudinal steel beam pass through the T-shaped hole and the cross-shaped hole respectively and are welded to the middle of the reinforced connecting steel plate to form a whole, and a horizontal connecting steel plate is welded between the middle reinforced connecting steel plates.

[0009] Furthermore, the metal bellows slurry outlet is a hole cut on one side of the upper end of the embedded metal bellows, with a height of not less than 40 mm and a width of not less than 40 mm. Steel plates are welded on the three edges of the incision respectively, and the length of the steel plates is not less than 90 mm, thereby forming the metal bellows slurry outlet; the far end of the metal bellows slurry outlet is facing the direction of the gap between the prefabricated recycled concrete pier and the recycled concrete foundation.

[0010] Furthermore, the length of the pier shaft longitudinal FPR composite reinforcement inserted into the embedded metal bellows is not less than 10 times the diameter of the pier shaft longitudinal FPR composite reinforcement; the diameter of the embedded metal bellows is not less than 2-3 times the diameter of the pier shaft longitudinal FPR composite reinforcement; the horizontal distance of the horizontal force resistance device horizontally buried in the recycled concrete foundation is not less than 3-6 times the socket depth.

[0011] Furthermore, the horizontal distance between the load-bearing steel plate and the four side surfaces of the bottom of the prefabricated recycled concrete pier and the four side surfaces of the socket is not less than 20 mm, and the vertical distance from the bottom surface of the prefabricated recycled concrete pier is not less than 20 mm, and the horizontal force resistance device located inside the recycled concrete foundation is fixed to the foundation longitudinal steel bars and foundation stirrups by welding.

[0012] Furthermore, the compressive strength of the high-strength concrete UHPC is not less than 120 MPa, and the tensile strength is not less than 10 MPa.

[0013] Furthermore, the number of the longitudinal FPR composite bars extending out of the prefabricated recycled concrete pier column is 1 / 2-1 / 4 times the total number of the longitudinal FPR composite bars in the prefabricated recycled concrete pier column; the socket depth of the prefabricated recycled concrete pier column is not less than 0.6 times the side length of the prefabricated recycled concrete pier column.

[0014] Furthermore, the inner diameter of the embedded metal corrugated pipe is 20-40mm larger than the longitudinal FPR composite reinforcement of the pier body, or the larger value of the inner diameter of 60mm, and the thickness is not less than 2mm; the inner diameter of the embedded grouting high-pressure pipe is 20-40mm, and the wall thickness is not less than 0.5mm.

[0015] Furthermore, a 10-30 mm thick mortar layer is provided between the bottom surface of the prefabricated recycled concrete pier column and the bottom surface of the recycled concrete foundation socket.

[0016] Furthermore, the foundation stirrups inside the recycled concrete foundation are arranged around the sockets, penetrate the middle of the recycled concrete foundation and overlap with the foundation longitudinal reinforcements.

[0017] The construction method of the FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node comprises the following steps:

[0018] S1. Tie the longitudinal FPR composite bars of the pier body, the stirrups of the pier body and the longitudinal FPR composite bars of the pier body reserved for extending out of the prefabricated recycled concrete pier column and inserting into the pre-buried metal corrugated pipe of the foundation in the factory. After the longitudinal FPR composite bars of the pier body and the stirrups of the pier body are tied, a steel grid is formed, the formwork is supported, the recycled concrete is poured, the test pieces are cured, the formwork is removed, and the production of the prefabricated recycled concrete pier column is completed;

[0019] S2. Process the T-shaped longitudinal steel beam, cross-shaped longitudinal steel beam, stress-bearing steel plate, horizontal connecting steel plate, vertical connecting steel plate, anchoring steel plate, stress-bearing steel plate support and middle reinforcing connecting steel plate components of the horizontal force-resisting device in the factory, weld the stress-bearing steel plate and anchoring steel plate to one end of the T-shaped longitudinal steel beam and the cross-shaped longitudinal steel beam respectively, connect and weld the T-shaped longitudinal steel beam and the cross-shaped longitudinal steel beam together by using the middle reinforcing connecting steel plate, weld the horizontal connecting steel plate and the vertical connecting steel plate to the stress-bearing steel plate, anchoring steel plate and middle reinforcing connecting steel plate, and obliquely weld the stress-bearing steel plate support to the upper part of the T-shaped longitudinal steel beam and the side of the stress-bearing steel plate to form an overall stress-bearing steel skeleton, thus completing the manufacture of the horizontal force-resisting device;

[0020] S3. Tie the foundation longitudinal steel bars and foundation stirrups of the recycled concrete foundation on site, reserve the socket for placing the prefabricated recycled concrete pier, and horizontally place the horizontal resistance devices processed and manufactured in the factory on the four sides of the socket. The horizontal resistance devices located inside the recycled concrete foundation are connected to the foundation longitudinal steel bars and foundation stirrups by welding to fix them, so that each load-bearing steel plate is parallel to the four side surfaces of the socket, and pre-embed a metal bellows on the bottom surface of the socket, and pre-embed a grouting high-pressure pipe at the bottom edge of each pre-embedded metal bellows to extend to the top surface of the recycled concrete foundation as a grouting channel. The upper end of the metal bellows grouting outlet at the upper end of the pre-embedded metal bellows is parallel to the bottom surface of the recycled concrete foundation socket, and the pre-embedded grouting high-pressure pipe connected to the lower end of the pre-embedded metal bellows and the metal bellows grouting outlet welded at the lower end are both vertically limited to the four sides of the socket, support the formwork, pour recycled concrete, maintain the components, remove the formwork, and complete the production of the recycled concrete foundation;

[0021] S4. Transport the prefabricated recycled concrete pier to the construction site, lay a 10-30mm mortar layer on the bottom surface of the recycled concrete foundation socket, insert the bearing steel plates of the four sides of the bottom of the prefabricated recycled concrete pier parallel to the horizontal force resistance device around the four sides into the socket, extend the longitudinal FPR composite reinforcement of the pier body of the prefabricated recycled concrete pier vertically into the embedded metal corrugated pipe, adjust the horizontality and verticality of the prefabricated recycled concrete pier, and complete the placement of the prefabricated recycled concrete pier;

[0022] S5. Mix high-strength concrete UHPC on site, use grouting equipment to fill the pre-buried grouting high-pressure pipe with high-strength concrete UHPC, use grouting method to pour high-strength concrete UHPC through the top of the pre-buried grouting high-pressure pipe, wait for high-strength concrete UHPC to overflow from the slurry outlets of each metal corrugated pipe, ensure that the corrugated pipe is fully grouted, and pour high-strength concrete UHPC between the four sides of the bottom of the prefabricated recycled concrete pier and the four sides of the recycled concrete foundation socket, so that the prefabricated recycled concrete pier and the recycled concrete foundation are connected as a whole, completing the assembly of the prefabricated recycled concrete pier and the recycled concrete foundation.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention adopts the technical means of processing prefabricated piers in prefabricated factories. The connection nodes of prefabricated recycled concrete piers and recycled concrete foundations adopt the connection structure of the combination of socket and horizontal resistance device. The prefabricated piers and foundations are made of recycled concrete components throughout the process. Environmental protection technology and clean energy are used to reduce pollution emissions, protect natural resources, and restore and maintain ecological balance. While the construction quality and component quality are guaranteed, it has the advantages of simple construction method, simple node structure, low socket depth, etc. The prefabricated assembly type can save on-site workload and time, reduce labor costs, transportation costs and reduce pollution to the environment. The prefabricated pier column FRP composite reinforcement can improve durability and corrosion resistance, increase service life, and reduce maintenance costs. Recycled concrete belongs to solid waste recycling, which can strengthen environmental protection, give full play to the environmental protection, energy saving, renewable and other characteristics of green building materials, and promote the development and application of green building materials.

[0025] 2. Most of the skeleton of the horizontal force resistance device is placed in the foundation. The skeleton inside the foundation can enhance the connectivity between the recycled concrete of the foundation around the socket and the recycled concrete at the far end of the foundation, forming an integral resistance to the expansion of the oblique cracks extending to the top surface of the foundation due to the stress at the bottom of the socket. At the same time, it can enhance the horizontal resistance of the connection node, and the partial skeleton located in the socket area can improve the anchoring capacity of the high-strength concrete UHPC between the pier and the foundation gap. The horizontal force of the connection node is jointly borne by the concrete and the horizontal force resistance device. The horizontal resistance device will bear most of the horizontal force around the socket of the foundation, reduce the compressive damage of the cap concrete, and the area of ​​the plastic hinge is first generated in the pier column above the connection node area. Under the influence of the new device, the superior mechanism of pier column-foundation coordination is achieved, further effectively enhancing the seismic performance of the pier column-foundation connection node.

[0026] 3. The longitudinal FRP composite reinforcement of the pier column is connected by grouting with the metal bellows anchored to the foundation to resist the pull-out force in the node area. The number of FRP composite reinforcements of the pier body extending out of the bottom section of the pier column accounts for 1 / 3-2 / 3 of the total. At the same time, UHPC grouting connection is adopted. While having sufficient connection strength and seismic requirements, the number of metal bellows and grouting pressure pipes in the foundation and the anchorage length of FRP composite reinforcement are greatly reduced, which effectively reduces the difficulty and precision during the prefabrication and assembly construction, further optimizes the structure of the connection node, reduces the reserved holes in the foundation, improves the integrity of the foundation structure, reduces the project cost, simplifies the construction process, and saves construction costs.

[0027] 4. Pre-buried corrugated pipes and pre-buried grouting pressure pipes in the foundation. The corrugated pipes can prevent the FRP composite bars of the pier body from being pulled out and damaged during the pulling process due to the UHPC, and the connection node structure is strengthened. In order to make the connection between the pier column FRP composite bars and the foundation reliable, high-strength concrete UHPC is poured into the pre-buried corrugated pipes through the pre-buried grouting pressure pipes. The overflow port at the upper end of the corrugated pipes is used to ensure that the UHPC in the corrugated pipes is filled densely and completely, and the filling quality of UHPC is guaranteed, so that the pier column-foundation connection is a whole, resisting the pulling force under the action of earthquakes, and improving the seismic safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic elevation view of the present invention;

[0029] Figure 2 The present invention Figure 1 AA cross-section diagram of ;

[0030] Figure 3 The present invention Figure 1 BB cross-section diagram;

[0031] Figure 4 Schematic diagram of the horizontal force resistance device and its components of the present invention, wherein: (a) is a schematic diagram of the horizontal force resistance device, (b) is a cross-sectional diagram of a cross-shaped longitudinal steel beam, (c) is a cross-sectional diagram of a T-shaped longitudinal steel beam, and (d) is a cross-sectional diagram of a middle reinforcement connecting plate;

[0032] Figure 5 Schematic diagram of the processing of prefabricated recycled concrete columns of the present invention, wherein: (a) is a schematic diagram of steel bar skeleton binding, (b) is an overall diagram of the prefabricated recycled concrete pier column;

[0033] Figure 6 Schematic diagram of recycled concrete foundation processing of the present invention, wherein: (a) is a schematic diagram of steel bar skeleton binding, (b) is a schematic diagram of horizontal force resistance device, (c) is a diagram of placement of pre-buried metal corrugated pipe and grouting pressure pipe, (d) is a schematic diagram of placement of horizontal force resistance device, and (e) is an overall diagram of recycled concrete foundation;

[0034] Figure 7 It is a three-dimensional schematic diagram of the prefabricated assembled pier column-foundation of the present invention, wherein: (a) is a prefabricated recycled concrete pier column, (b) is a recycled concrete foundation, (c) is an assembly diagram of the longitudinal FRP composite steel bar socket of the pier body, (d) is a schematic diagram of grouting the embedded metal corrugated pipe through a grouting pressure pipe, (e) is a schematic diagram of grouting the socket gap, and (f) is an overall diagram of the assembled pier column-foundation. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-7 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0036] Example 1

[0037] As attached Figure 1-3 As shown, the FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket joint of this embodiment is composed of a prefabricated recycled concrete pier column 1 and a recycled concrete foundation 4. The prefabricated recycled concrete pier column 1 is inserted into the foundation hole groove of the recycled concrete foundation 4. Figure 2 and Figure 5 As shown, the prefabricated recycled concrete pier 1 includes longitudinal FPR composite bars 2 for the pier body and stirrups 3 for the pier body. The recycled concrete foundation 4 includes a pre-buried metal corrugated pipe 5, a pre-buried grouting high-pressure pipe 6 and a horizontal force resistance device 10. The longitudinal FPR composite bars 2 for the pier body are pre-buried around the interior of the prefabricated recycled concrete pier 1, and the part of the bottom extending out of the prefabricated pier 1 is inserted into the pre-buried metal corrugated pipe 5, and high-strength concrete UHPC 7 is poured into the pre-buried metal corrugated pipe 5. The pre-buried metal corrugated pipe 5 is pre-buried in the bottom of the socket of the recycled concrete foundation 4, and the top surface of the metal corrugated pipe slurry outlet 20 at its upper end is flush with the bottom surface of the socket of the recycled concrete foundation 4. The side wall of the pre-buried metal corrugated pipe 5 is connected with a pre-buried grouting high-pressure pipe 6 extending to the upper surface of the recycled concrete foundation 4.

[0038] In this embodiment, Figure 3-4 as well as Figure 6As shown, the horizontal force resistance device 10 includes an upper T-shaped longitudinal steel beam 11, a lower cross-shaped longitudinal steel beam 12, a stress-bearing steel plate 13 and a middle reinforced connecting steel plate 18. The horizontal force resistance device 10 is buried around the reserved socket of the recycled concrete foundation 4, located below the foundation longitudinal steel bars 8 and foundation stirrups 9 inside the recycled concrete foundation 4, and welded to the foundation longitudinal steel bars 8 and foundation stirrups 9. In this embodiment, the foundation stirrups 9 inside the recycled concrete foundation 4 are arranged around the socket, penetrate the middle of the recycled concrete foundation 4 and overlap the foundation longitudinal bars 8. The stress-bearing steel plate 13 is welded to one end of the T-shaped longitudinal steel beam 11 and the cross-shaped longitudinal steel beam 12, and the stress-bearing steel plate 13 extends around the socket of the recycled concrete foundation 4 and is limited between the four sides of the bottom of the prefabricated recycled concrete pier 1 and the four sides of the foundation socket. A stress-bearing steel plate support 17 is welded between the back of the stress-bearing steel plate 13 and the T-shaped longitudinal steel beam 11. The other ends of the T-shaped longitudinal steel beam 11 and the cross-shaped longitudinal steel beam 12 are welded with an anchoring steel plate 16. The multiple force-bearing steel plates 13 and the multiple anchoring steel plates 16 are welded together through the horizontal connecting steel plate 14 and the vertical connecting steel plate 15. The middle reinforcing connecting steel plate 18 is provided with a T-shaped hole and a cross-shaped hole. The T-shaped longitudinal steel beam 11 and the cross-shaped longitudinal steel beam 12 pass through the T-shaped hole and the cross-shaped hole respectively and are welded to the middle of the reinforcing connecting steel plate 18 to form a whole. The horizontal connecting steel plate 14 is welded between the middle reinforcing connecting steel plates 18.

[0039] In this embodiment, the specific parameters of each component are as follows: the metal bellows slurry outlet 20 is a hole cut on one side of the upper end of the embedded metal bellows 5, with a height of 40 mm and a width of 40 mm. Steel plates are welded on the three edges of the cut, and the length of the steel plates is 90 mm, thereby forming the metal bellows slurry outlet 20. The far end of the metal bellows slurry outlet 20 faces the direction of the gap between the prefabricated recycled concrete pier 1 and the recycled concrete foundation 4. In addition, the length of the pier shaft longitudinal FPR composite ribs 2 inserted into the embedded metal bellows 5 is 10 times the diameter of the pier shaft longitudinal FPR composite ribs 2. The diameter of the embedded metal bellows 5 is 3 times the diameter of the pier shaft longitudinal FPR composite ribs 2. The horizontal distance of the horizontal resistance device 10 horizontally embedded in the recycled concrete foundation 4 is not less than 6 times the socket depth. In this embodiment, the number of pier shaft longitudinal FPR composite ribs 2 extending out of the prefabricated recycled concrete pier 1 is 1 / 2 times the total number of pier shaft longitudinal FPR composite ribs 2 in the prefabricated recycled concrete pier 1. The socket depth of the prefabricated recycled concrete pier 1 is 0.6 times the side length of the prefabricated recycled concrete pier 1. The inner diameter of the embedded metal corrugated pipe 5 is 20-40mm larger than the longitudinal FPR composite reinforcement 2 of the pier body, or the larger value of the inner diameter of 60mm, and the thickness is not less than 2mm. The inner diameter of the embedded grouting high-pressure pipe 6 is 20-40mm, and the wall thickness is not less than 0.5mm. In addition, if Figure 1As shown, the horizontal distance between the load-bearing steel plate 13 and the four sides of the bottom of the prefabricated recycled concrete pier 1 and the four sides of the socket is 20 mm, and the vertical distance from the bottom surface of the prefabricated recycled concrete pier 1 is 20 mm, and the horizontal resistance device 10 located inside the recycled concrete foundation 4 is fixed to the foundation longitudinal steel bars 8 and the foundation stirrups 9 by welding.

[0040] In this embodiment, the compressive strength of the high-strength concrete UHPC7 is not less than 120 MPa, and the tensile strength is not less than 10 MPa.

[0041] Example 2

[0042] In this embodiment, a 30 mm thick mortar layer 19 is provided between the bottom surface of the prefabricated recycled concrete pier 1 and the bottom surface of the socket of the recycled concrete foundation 4. Other structures and connection methods are the same as those in Embodiment 1.

[0043] Example 3

[0044] The specific construction method of the FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node in the above-mentioned embodiment 2 includes the following steps:

[0045] S1. Tie up the longitudinal FPR composite bars 2 of the pier body, the stirrups 3 of the pier body and the reserved longitudinal FPR composite bars 2 of the pier body which are to be extended out of the prefabricated recycled concrete pier column 1 and inserted into the pre-embedded metal corrugated pipe 5 of the foundation 5 in the factory. After the tying up of the longitudinal FPR composite bars 2 of the pier body and the stirrups 3 of the pier body is completed, a steel mesh frame is formed, the formwork is supported, the recycled concrete is poured, the test piece is cured, the formwork is removed, and the production of the prefabricated recycled concrete pier column 1 is completed.

[0046] S2. Process the T-shaped longitudinal steel beam 11, cross-shaped longitudinal steel beam 12, load-bearing steel plate 13, horizontal connecting steel plate 14, vertical connecting steel plate 15, anchoring steel plate 16, load-bearing steel plate support 17 and middle reinforcing connecting steel plate 18 components of the horizontal force-resisting device 10 in the factory, weld the load-bearing steel plate 13 and the anchoring steel plate 16 to one end of the T-shaped longitudinal steel beam 11 and the cross-shaped longitudinal steel beam 12 respectively, connect the T-shaped longitudinal steel beam 11 and the cross-shaped longitudinal steel beam 12 together and weld them by using the middle reinforcing connecting steel plate 18, weld the horizontal connecting steel plate 14 and the vertical connecting steel plate 15 to the load-bearing steel plate 13, the anchoring steel plate 16 and the middle reinforcing connecting steel plate 18, and weld the load-bearing steel plate support 17 obliquely to the upper part of the T-shaped longitudinal steel beam 11 and the side of the load-bearing steel plate 13 to form an integral load-bearing steel skeleton, thereby completing the manufacture of the horizontal force-resisting device 10.

[0047] S3. Tie the foundation longitudinal steel bars 8 and foundation stirrups 9 of the recycled concrete foundation 4 on site, reserve a socket for placing the prefabricated recycled concrete pier 1, and horizontal force resistance devices 10 processed and manufactured in the factory are placed horizontally on the four sides of the socket. The horizontal resistance device 10 located inside the recycled concrete foundation 4 is connected to the foundation longitudinal steel bars 8 and the foundation stirrups 9 by welding to fix them, so that each load-bearing steel plate 13 is parallel to the four side surfaces of the socket, and a metal bellows 5 is embedded in the bottom surface of the socket, and a grouting high-pressure pipe 6 is embedded at the bottom edge of each embedded metal bellows 5 and extends to the top surface of the recycled concrete foundation 4 as a grouting channel. The upper end of the metal bellows slurry outlet 20 at the upper end of the embedded metal bellows 5 is parallel to the bottom surface of the socket of the recycled concrete foundation 4, and the embedded grouting high-pressure pipe 6 connected to the lower end of the embedded metal bellows 5 and the metal bellows slurry outlet 20 welded at the lower end are both vertically limited to the four sides of the socket, support the formwork, pour recycled concrete, maintain the components, remove the formwork, and complete the production of the recycled concrete foundation 4.

[0048] S4. The prefabricated recycled concrete pier 1 is transported to the construction site, a 10-30 mm thick mortar layer 19 is laid on the bottom surface of the socket of the recycled concrete foundation 4, and the load-bearing steel plates 13 of the four sides of the bottom of the prefabricated recycled concrete pier 1 are parallelly passed through the surrounding horizontal force resistance devices 10 and inserted into the socket, and the longitudinal FPR composite reinforcement 2 extending from the pier body of the prefabricated recycled concrete pier 1 is vertically inserted into the embedded metal corrugated pipe 5, and the horizontality and verticality of the prefabricated recycled concrete pier 1 are adjusted to complete the placement of the prefabricated recycled concrete pier 1.

[0049] S5, mixing high-strength concrete UHPC7 on site, using a grouting device to fill the pre-buried grouting high-pressure pipe 6 with high-strength concrete UHPC7, using a grouting method to pour high-strength concrete UHPC7 through the top of the pre-buried grouting high-pressure pipe 6, waiting for the high-strength concrete UHPC7 to overflow from the slurry outlets 20 of each metal corrugated pipe to ensure that the corrugated pipe is fully grouted, pouring high-strength concrete UHPC7 between the four sides of the bottom of the prefabricated recycled concrete pier 1 and the four sides of the socket of the recycled concrete foundation 4, so that the prefabricated recycled concrete pier 1 and the recycled concrete foundation 4 are connected as a whole, completing the assembly work of the prefabricated recycled concrete pier 1 and the recycled concrete foundation 4.

[0050] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket joint, comprising a prefabricated recycled concrete pier column (1) and a recycled concrete foundation (4), wherein the prefabricated recycled concrete pier column (1) is inserted into a foundation hole groove of the recycled concrete foundation (4), and is characterized in that: The prefabricated recycled concrete pier column (1) comprises longitudinal FPR composite reinforcement (2) of the pier body and stirrups (3) of the pier body; the recycled concrete foundation (4) comprises a pre-buried metal corrugated pipe (5), a pre-buried grouting high-pressure pipe (6) and a horizontal resistance device (10); The longitudinal FPR composite reinforcement (2) of the pier body is pre-buried around the inside of the prefabricated recycled concrete pier column (1), and the part of the bottom extending out of the prefabricated pier column (1) is inserted into the inside of the pre-buried metal corrugated pipe (5), and high-strength concrete UHPC (7) is poured into the inside of the pre-buried metal corrugated pipe (5); The pre-buried metal bellows (5) is pre-buried in the bottom of the socket of the recycled concrete foundation (4), and the top surface of the metal bellows slurry outlet (20) at the upper end thereof is flush with the bottom surface of the socket of the recycled concrete foundation (4); the side wall of the pre-buried metal bellows (5) is connected to a pre-buried grouting high-pressure pipe (6) extending to the upper surface of the recycled concrete foundation (4); The horizontal force-resisting device (10) comprises an upper T-shaped longitudinal steel beam (11), a lower cross-shaped longitudinal steel beam (12), a stress-bearing steel plate (13) and a middle reinforced connecting steel plate (18); the horizontal force-resisting device (10) is buried around the reserved socket of the recycled concrete foundation (4), located below the foundation longitudinal steel bars (8) and foundation stirrups (9) inside the recycled concrete foundation (4), and welded to the foundation longitudinal steel bars (8) and foundation stirrups (9); the stress-bearing steel plate (13) is welded to one end of the T-shaped longitudinal steel beam (11) and the cross-shaped longitudinal steel beam (12), and the stress-bearing steel plate (13) extends around the socket of the recycled concrete foundation (4) and is limited between the four side surfaces of the bottom of the prefabricated recycled concrete pier (1) and the four sides of the foundation socket; a stress-bearing steel plate support (17) is welded between the back of the stress-bearing steel plate (13) and the T-shaped longitudinal steel beam (11); The other ends of the T-shaped longitudinal steel beam (11) and the cross-shaped longitudinal steel beam (12) are welded with anchoring steel plates (16); the plurality of load-bearing steel plates (13) and the plurality of anchoring steel plates (16) are welded together via horizontal connecting steel plates (14) and vertical connecting steel plates (15); The middle reinforcing connecting steel plate (18) is provided with a T-shaped hole and a cross-shaped hole, the T-shaped longitudinal steel beam (11) and the cross-shaped longitudinal steel beam (12) respectively pass through the T-shaped hole and the cross-shaped hole and are welded to the middle of the reinforcing connecting steel plate (18) to form a whole, and horizontal connecting steel plates (14) are welded between the middle reinforcing connecting steel plates (18).

2. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1 is characterized in that: The metal bellows slurry outlet (20) is a hole cut on one side of the upper end of the embedded metal bellows (5), with a height of not less than 40 mm and a width of not less than 40 mm. Steel plates are welded to the three edges of the cut, and the length of the steel plates is not less than 90 mm, thereby forming the metal bellows slurry outlet (20); the far end of the metal bellows slurry outlet (20) faces the direction of the gap between the prefabricated recycled concrete pier (1) and the recycled concrete foundation (4).

3. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The length of the pier shaft longitudinal FPR composite reinforcement (2) inserted into the pre-buried metal corrugated pipe (5) is not less than 10 times the diameter of the pier shaft longitudinal FPR composite reinforcement (2); the diameter of the pre-buried metal corrugated pipe (5) is not less than 2-3 times the diameter of the pier shaft longitudinal FPR composite reinforcement (2); and the horizontal distance at which the horizontal force resistance device (10) is horizontally buried in the recycled concrete foundation (4) is not less than 3-6 times the socket depth.

4. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The horizontal distance between the load-bearing steel plate (13) and the four side surfaces of the bottom of the prefabricated recycled concrete pier (1) and the four side surfaces of the socket is not less than 20 mm, and the vertical distance between the load-bearing steel plate (13) and the bottom surface of the prefabricated recycled concrete pier (1) is not less than 20 mm, and the horizontal force-resisting device (10) located inside the recycled concrete foundation (4) is fixed to the foundation longitudinal steel bars (8) and the foundation stirrups (9) by welding.

5. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The high-strength concrete UHPC (7) has a compressive strength of not less than 120 MPa and a tensile strength of not less than 10 MPa.

6. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The number of the pier shaft longitudinal FPR composite bars (2) extending out of the prefabricated recycled concrete pier column (1) is 1 / 2-1 / 4 times the total number of the pier shaft longitudinal FPR composite bars (2) in the prefabricated recycled concrete pier column (1); the socket depth of the prefabricated recycled concrete pier column (1) is not less than 0.6 times the side length of the prefabricated recycled concrete pier column (1).

7. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The inner diameter of the pre-buried metal corrugated pipe (5) is 20-40 mm larger than the longitudinal FPR composite reinforcement (2) of the pier body, or the larger value of the inner diameter of 60 mm, and the thickness is not less than 2 mm; the inner diameter of the pre-buried grouting high-pressure pipe (6) is 20-40 mm, and the wall thickness is not less than 0.5 mm.

8. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: A 10-30 mm thick mortar layer (19) is provided between the bottom surface of the prefabricated recycled concrete pier column (1) and the bottom surface of the socket of the recycled concrete foundation (4).

9. The FRP composite reinforced recycled concrete prefabricated assembly pier column-foundation socket node according to claim 1, characterized in that: The foundation stirrups (9) inside the recycled concrete foundation (4) are arranged around the sockets, penetrate the middle of the recycled concrete foundation (4) and overlap with the foundation longitudinal reinforcement (8).

10. A construction method for prefabricated assembly of FRP composite reinforced recycled concrete pier-foundation socket joint according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, tying the longitudinal FPR composite bars (2) of the pier body, the stirrups (3) of the pier body and the longitudinal FPR composite bars (2) of the pier body reserved for extending out of the prefabricated recycled concrete pier column (1) and inserting the pre-buried metal corrugated pipe (5) of the foundation (5) in the factory, forming a steel grid after the pier body longitudinal FPR composite bars (2) and the stirrups (3) of the pier body are tied, supporting the formwork, pouring the recycled concrete, curing the test piece, removing the formwork, and completing the production of the prefabricated recycled concrete pier column (1); S2. Processing the T-shaped longitudinal steel beam (11), the cross-shaped longitudinal steel beam (12), the load-bearing steel plate (13), the horizontal connecting steel plate (14), the vertical connecting steel plate (15), the anchoring steel plate (16), the load-bearing steel plate support (17) and the middle reinforcing connecting steel plate (18) of the horizontal force-resisting device (10) in the factory, welding the load-bearing steel plate (13) and the anchoring steel plate (16) to one end of the T-shaped longitudinal steel beam (11) and the cross-shaped longitudinal steel beam (12), respectively, and then reinforcing the middle reinforcing connecting steel plate (18) with the middle reinforcing connecting steel plate (18). The strong connection steel plate (18) connects and welds the T-shaped longitudinal steel beam (11) and the cross-shaped longitudinal steel beam (12), and is welded to the load-bearing steel plate (13), the anchoring steel plate (16) and the middle strengthening connection steel plate (18) through the horizontal connection steel plate (14) and the vertical connection steel plate (15). The load-bearing steel plate support (17) is obliquely welded to the upper part of the T-shaped longitudinal steel beam (11) and the side of the load-bearing steel plate (13) to form an integral load-bearing steel skeleton, thereby completing the manufacture of the horizontal resistance device (10); S3. The foundation longitudinal steel bars (8) and foundation stirrups (9) of the recycled concrete foundation (4) are tied on site, a socket for placing the prefabricated recycled concrete pier (1) is reserved, and horizontal force-resisting devices (10) processed and manufactured in the factory are placed horizontally on the four sides of the socket. The horizontal force-resisting devices (10) located inside the recycled concrete foundation (4) are fixed to the foundation longitudinal steel bars (8) and foundation stirrups (9) by welding, so that each load-bearing steel plate (13) is parallel to the four side surfaces of the socket, and a metal corrugated pipe (5) is embedded in the bottom surface of the socket. The pre-buried grouting high-pressure pipe (6) at the bottom edge of the pre-buried metal bellows (5) extends to the top surface of the recycled concrete foundation (4) to serve as a grouting channel, the upper end of the metal bellows grouting outlet (20) at the upper end of the pre-buried metal bellows (5) is parallel to the bottom surface of the socket of the recycled concrete foundation (4), the pre-buried grouting high-pressure pipe (6) connected to the lower end of the pre-buried metal bellows (5) and the metal bellows grouting outlet (20) welded at the lower end are both vertically limited to the four sides of the socket, the formwork is supported, the recycled concrete is poured, the components are maintained, the formwork is removed, and the production of the recycled concrete foundation (4) is completed; S4, transport the prefabricated recycled concrete pier (1) to the construction site, lay a 10-30 mm thick mortar layer (19) on the bottom surface of the socket of the recycled concrete foundation (4), insert the bearing steel plate (13) of the four sides of the bottom of the prefabricated recycled concrete pier (1) parallel to the horizontal resistance device (10) around it into the socket, extend the longitudinal FPR composite reinforcement (2) of the pier body of the prefabricated recycled concrete pier (1) vertically into the embedded metal corrugated pipe (5), adjust the horizontality and verticality of the prefabricated recycled concrete pier (1), and complete the placement of the prefabricated recycled concrete pier (1); S5, mixing high-strength concrete UHPC (7) on site, using a grouting device to fill the pre-buried grouting high-pressure pipe (6) with the high-strength concrete UHPC (7), using a grouting method to pour the high-strength concrete UHPC (7) through the top of the pre-buried grouting high-pressure pipe (6), waiting for the high-strength concrete UHPC (7) to overflow from the grouting outlets (20) of each metal corrugated pipe, ensuring that the corrugated pipe is fully grouted, pouring high-strength concrete UHPC (7) between the four sides of the bottom of the prefabricated recycled concrete pier column (1) and the four sides of the socket of the recycled concrete foundation (4), so that the prefabricated recycled concrete pier column (1) and the recycled concrete foundation (4) are connected to form a whole, completing the assembly work of the prefabricated recycled concrete pier column (1) and the recycled concrete foundation (4).

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