A construction method of a spigot assembly type corrugated steel pipe steel reinforced concrete bridge pier

Abstract

The application provides a construction method of a bell-and-spigot assembled corrugated steel pipe type steel concrete bridge pier, and belongs to the technical field of bridge structure members; the bridge pier comprises a top cap beam, a middle prefabricated corrugated steel pipe type steel concrete column and a lower pile cap; the column body comprises, from inside to outside, a type steel, core concrete and a galvanized corrugated steel pipe, adjacent single columns are spliced through a bell-and-spigot clamping plate and an external column body connecting piece; the cap beam and the pile cap are provided with a built-in corrugated steel plate core mold in a reserved cup opening, and a pre-buried connecting piece is connected with the column body type steel through bolts; during construction, the cap beam and the column body are prefabricated in a factory, the pile cap is cast in situ, the column body is hoisted and connected with the pile cap and the cap beam through bolts, then a baffle and a column body connecting piece are installed and grouting is performed; the corrugated steel pipe provides circumferential constraint and corrosion protection, the node connection is convenient and reliable, the method has the advantages of fast construction speed, strong anti-seismic performance, good durability and the like, and is suitable for bridge construction in various corrosion environments and special working conditions.

Description

Technical Field

[0001] This invention belongs to the field of bridge structural components, and in particular relates to a construction method for a socket-mounted corrugated steel pipe steel-concrete bridge pier. Background Technology

[0002] Most current bridge piers are constructed using cast-in-place reinforced concrete, requiring extensive formwork and supports during construction. This results in long construction periods, uneconomical cross-sectional dimensions, high labor costs, difficulty in ensuring construction quality, and significant environmental impact. Existing prefabricated reinforced concrete bridge piers and their joint connections are often complex. Under seismic loads, the surface concrete is prone to cracking and spalling, and joints bearing high stress are susceptible to failure, leading to relatively weak overall seismic performance. Furthermore, bridge pier structures are often exposed to corrosive environments such as the open air, lakes, and oceans, constantly subjected to erosion from corrosive substances in the air and water, as well as impacts from sediment. Traditional bridge piers have poor corrosion resistance and are prone to corrosion damage, while existing anti-corrosion measures also suffer from cumbersome procedures and high costs. Summary of the Invention

[0003] In view of this, in order to shorten the construction period of the original cast-in-place reinforced concrete bridge piers, reduce the complexity of the joint connections of the existing prefabricated bridge piers, improve the seismic performance of the existing bridge piers, and improve the corrosion resistance of the existing bridge piers, the present invention provides a construction method for a socket-mounted prefabricated corrugated steel pipe steel-concrete bridge pier.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a socket-mounted corrugated steel pipe steel-concrete bridge pier, comprising a top cap beam, a middle precast corrugated steel pipe steel-concrete column, and a lower pier cap, wherein the top cap beam, the middle precast corrugated steel pipe steel-concrete column, and the lower pier cap are arranged sequentially from top to bottom. The top cap beam includes top longitudinal reinforcement, cap beam connectors, cap beam core mold, bottom longitudinal reinforcement, cap beam reserved cup opening, and baffle. The top of the cap beam body is provided with top longitudinal reinforcement, the bottom of the cap beam is provided with bottom longitudinal reinforcement, and the middle of the cap beam core mold is provided. The cap beam body body is also provided with cap beam connectors and baffles, and the baffles are arranged on the outer periphery of the column. The precast corrugated steel pipe steel-concrete column in the middle is extended by splicing single columns. Each single column includes internal steel, core concrete and external corrugated steel pipe. The internal steel, core concrete and corrugated steel pipe are arranged in sequence from the inside to the outside. Adjacent single columns are connected by inner socket plates and external column connectors. The lower support includes a support reserved cup, a reinforcing cage and a support connector. The support body is provided with the support reserved cup and the support connector. The support connector is connected to the internal steel of the column. The reinforcing cage is provided in the support reserved cup.

[0005] Furthermore, the top longitudinal reinforcement of the cap beam is attached to the top plate of the cap beam connector and connected by spot welding; the pre-embedded screws are evenly distributed around the pre-reserved cup opening of the cap beam for subsequent connection of the baffle.

[0006] Furthermore, the baffle is provided with baffle grouting holes.

[0007] Furthermore, the cap beam connector includes a cap beam connector top plate and a cap beam connector connecting plate, the pier connector includes a pier connector connecting plate and a pier connector bottom plate, the cap beam connector connecting plate and the pier connector connecting plate are provided with bolt holes, and the internal steel of the column is provided with internal steel reserved bolt holes.

[0008] Furthermore, the cross-shaped interval formed by the connecting plates of the foundation connector is slightly larger than the thickness of the internal steel of the column. Before connection, the internal steel of the column is inserted into the cross-shaped interval. After the bolt holes of the connecting plate of the foundation connector exposed above the concrete pouring interface are aligned with the bolt holes of the internal steel, bolts are used to connect and tighten them.

[0009] Furthermore, the internal steel sections of the precast corrugated steel pipe concrete column in the middle are connected by socket plates. After the reserved bolt holes in the internal steel sections and the reserved bolt holes in the socket plates are aligned, they are fastened with bolts.

[0010] Furthermore, the exposed portion of the internal steel profile of the column extends into the reserved cup opening of the cap beam by a length not less than D, the corrugated steel pipe extends into the reserved cup opening of the cap beam by a length not less than 0.25D, the exposed portion of the internal steel profile of the column extends into the reserved cup opening of the foundation by a length not less than 2D, and the corrugated steel pipe extends into the reserved cup opening of the foundation by a length not less than 0.5D, where D is the outer diameter of the precast corrugated steel pipe steel-concrete column in the middle.

[0011] Furthermore, adjacent single columns of the precast corrugated steel pipe steel-concrete composite column in the middle are connected by column connectors. The column connectors are installed on the outer periphery of the corrugated steel pipe. Each column connector includes two semi-circular corrugated plates, with column connector connecting plates at both ends of the semi-circular corrugated plates and column connector grouting holes on the semi-circular corrugated plates.

[0012] Furthermore, the corrugated steel pipe is a galvanized corrugated steel pipe with a thickness ranging from 1.0mm to 8.0mm and a diameter ranging from 300mm to 3000mm.

[0013] A construction method for a socket-type precast corrugated steel pipe concrete bridge pier includes the following construction steps: Step 1: Precast corrugated steel pipe steel-concrete column in the middle: Install the internal steel section of the column inside the corrugated steel pipe, weld a sealing plate with a pouring hole to the column end, and remove the sealing plate after curing to the design strength after pouring; the internal steel section of the column is a cross-shaped steel, I-shaped steel or H-shaped steel; Step 2: Fabrication of connectors: Connectors include cap beam connectors, foundation connectors, baffle connectors, and column connectors; Step 3: Precast top cap beam: According to the design, embed the cap beam connectors and bolts into the top cap beam. The top cap beam has a reserved cup opening. The bottom longitudinal reinforcement of the cap beam is cut at the reserved cup opening and then bent into a U-shape and extended into the reserved cup opening. Corrugated steel plate is cut at the reserved cup opening of the cap beam as the core mold of the cap beam. After pouring, it is cured to the design strength. The core mold of the cap beam is not removed. Step 4: Lower foundation pouring: During on-site construction, the lower foundation is poured according to the design. The foundation connectors are pre-embedded in the lower foundation. The lower foundation has a reserved cup opening. Corrugated steel plates are cut at the reserved cup opening as the foundation core mold. After pouring, it is cured to the design strength. The foundation core mold is not removed. Step 5: Node Connection: Transport the precast corrugated steel pipe steel-concrete column to the construction site, splice the column to the designed length, insert the internal steel of the column into the bearing cap connector and align it, then use bolts to connect and carry out post-pouring construction. Subsequently, hoist the top cap beam, insert and align the cap beam connector with the internal steel of the column, then use bolts to connect and carry out grouting construction. Step Six: Post-pouring grouting: Insert the reinforcing cage into the reserved cup opening of the lower foundation and carry out post-pouring concrete construction. After the column connectors and baffle connectors are completed, install and carry out grouting construction.

[0014] Compared with the prior art, the beneficial effects of the construction method for a socket-mounted corrugated steel pipe concrete bridge pier described in this invention are: (1) The present invention adopts factory prefabrication, on-site hoisting and bolt splicing. Compared with traditional cast-in-place reinforced concrete bridge piers, it has a faster construction speed, shorter construction cycle, less construction workload and better construction quality. Compared with traditional prefabricated reinforced concrete bridge piers, it eliminates the process of steel sleeves, prestressed steel reinforcement arrangement and other procedures, and the node connection is more convenient. The safety of key connection points is ensured by steel socket and splicing inside the column, corrugated steel side plate restraint, baffle bending resistance, and U-shaped bending of longitudinal reinforcement of cap beam.

[0015] (2) This invention uses galvanized corrugated steel pipes to encase the bridge piers. The galvanized corrugated steel pipes provide circumferential constraints for the internal steel sections and core concrete, placing the concrete inside the column under triaxial compression. Simultaneously, due to the presence of the internal steel sections, the internal concrete fully utilizes its mechanical properties under the constraint of the external corrugated steel pipes, resulting in better mechanical performance for the bridge piers compared to existing pier structures. The corrugated steel plate core mold at the cap and pier cap joint provides lateral constraint for the concrete in the joint area, enhancing the flexural bearing capacity of the connection joint and improving its seismic performance. Furthermore, the presence of the corrugated steel plate further strengthens the shear resistance of the joint in the joint area.

[0016] (3) The present invention uses galvanized corrugated steel pipes to encase the bridge piers, which fully protects the internal steel sections and core concrete from direct contact with the external environment. Due to the corrosion protection and adhesion of the galvanized layer of the corrugated steel pipe, the components have better durability. The corrugated steel plate core mold wraps the cup-mouth area of ​​the connection node, which gives the key connection area of ​​the cup mouth better corrosion protection.

[0017] (4) The invention of galvanized corrugated steel pipes as casting templates for precast columns eliminates the need for formwork and also eliminates the need for internal stirrups. Galvanized corrugated steel plates are used as core molds for casting the cap beam and foundation. No formwork removal is required after casting, which reduces the amount of construction work.

[0018] (5) The internal steel of the column of the present invention serves as the main load-bearing component of the pier. After being bolted to the lower pier, the steel cage is placed and concrete is poured afterward, making the connection more convenient and reliable. After being bolted to the upper cap beam, the cup-shaped part is reinforced by grouting. The addition of U-shaped bent longitudinal bars and pre-embedded bolt connecting baffles enhances the integrity of the beam-column connection node and effectively improves the seismic performance and corrosion resistance of the node area.

[0019] (6) Before grouting the cap beam cup mouth of the present invention, a baffle needs to be installed. The baffle is connected to the bottom of the cap beam by a pre-embedded screw and to the column by two semi-circular arc-shaped corrugated plates, which increases the integrity of the cap beam and the column and improves the seismic performance of the cap beam-column joint.

[0020] (7) In this invention, the corrugated steel pipe steel-concrete composite column is spliced ​​and lengthened by bolt clamp connection followed by grouting, ensuring the continuity of the internal steel as the main load-bearing component and the overall strength of the column, thus possessing high load-bearing capacity. The corrugated steel pipe steel-concrete composite column and the foundation adopt a socket connection. By increasing the area of ​​the bottom plate of the pre-embedded connector, the integrity of the column and the foundation can be increased, thereby strengthening the seismic performance of the pier. It can also reduce the length of the insertion cup of the traditional insert-type pier, making this type of pier applicable to special working conditions such as smaller foundation thickness.

[0021] (8) The steel profile inside the present invention can be used as a stress point during the hoisting operation of precast columns, and can also be used as a positioning template during the installation operation of precast columns, thus eliminating the construction process of installing positioning templates. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an overall schematic diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the pre-embedded parts for the cap beam of the present invention.

[0024] Figure 3 This is a schematic diagram of the embedded parts of the foundation of the present invention.

[0025] Figure 4 This is a schematic diagram of the splicing of the cup-mouth node steel profile of the present invention.

[0026] Figure 5 This is a schematic diagram of the splicing of corrugated steel pipe steel-concrete column steel sections according to the present invention.

[0027] Figure 6 This is a schematic diagram of the post-pouring grouting of the present invention.

[0028] In the diagram: 1-1 is the top cap beam, 1-2 is the middle precast corrugated steel pipe steel-concrete column, and 1-3 is the lower foundation. 2-1 is the top longitudinal reinforcement of the cap beam, 2-2 is the cap beam connector, 2-3 is the corrugated steel plate core mold of the cap beam, 2-4 is the bottom longitudinal reinforcement of the cap beam, and 2-5 is the embedded bolt. 3-1 is the corrugated steel plate core mold for the foundation; 3-2 is the foundation connector. 4-1 is the core concrete, 4-2 is the corrugated steel pipe, 4-3 is the internal steel of the column, 4-4 is the reserved bolt holes for the internal steel of the column, 4-5 is the connecting plate of the foundation connector, 4-6 is the reserved bolt holes for the connecting plate of the foundation connector, 4-7 is the concrete pouring interface, 4-8 is the base plate of the foundation connector, and 4-9 is the bolt.

[0029] 5-1 is the socket clamping plate, and 5-2 is the bolt hole reserved on the socket clamping plate.

[0030] 6-1 is the reserved cup opening for the cap beam; 6-2 is the baffle; 6-3 is the grouting hole for the baffle; 6-4 is the semi-circular corrugated steel pipe connecting plate; 6-5 is the reserved screw hole for the baffle; 6-6 is the semi-circular corrugated steel pipe; 6-7 is the column connector; 6-8 is the column connector connecting plate; 6-9 is the column connector grouting hole; 6-10 is the reserved cup opening for the foundation; 6-11 is the reinforcing cage. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0032] See Figures 1-6This embodiment describes a socket-type precast corrugated steel-concrete composite bridge pier, comprising a top cap beam 1-1, a central precast corrugated steel-concrete composite column 1-2, a lower pier cap 1-3, and some connecting parts and post-cast concrete. The top cap beam 1-1 and the central precast corrugated steel-concrete composite column 1-2 are precast in a factory. The central precast corrugated steel-concrete composite column 1-2 can be spliced ​​to extend its length. The lower pier cap 1-3 is cast on-site.

[0033] Specific Implementation Method Two: Combining Figure 2 , Figure 6 As shown, during the prefabrication of the top cap beam 1-1, the connectors need to be pre-embedded. The top longitudinal reinforcement 2-1 of the cap beam is attached to the top plate of the pre-embedded connector 2-2 and connected by spot welding; the pre-embedded screws 2-5 are evenly distributed around the reserved cup opening 6-1 of the cap beam for subsequent connection of the baffle 6-2.

[0034] Specific implementation method three: such as Figure 2 As shown, during the casting and formwork erection of the top cap beam 1-1, a corrugated steel plate was used as the core mold 2-3 for the reserved cup opening 6-1 of the cap beam. The bottom longitudinal reinforcement 2-4 of the cap beam was cut, bent into a U-shape, and then inserted into the reserved cup opening 6-1. After casting, the corrugated steel plate was not removed from the formwork; it served as a shear-resistant component in the cup opening area.

[0035] Specific implementation method four: such as Figure 3 As shown, during the pouring of the lower foundation 1-3, the pre-embedded connector 3-2 needs to be pre-embedded. When the lower foundation 1-3 is poured and the formwork is erected, the pre-reserved cup opening 6-10 of the foundation uses a corrugated steel plate as the corrugated steel plate core mold 3-1. After the pouring is completed, the corrugated steel plate does not undergo a demolding process and exists as a shear-resistant component in the cup opening area.

[0036] Specific implementation method five: such as Figure 4 As shown, the central precast corrugated steel pipe steel-concrete column 1-2 mainly includes internal steel 4-3, core concrete 4-1 and external galvanized corrugated steel pipe 4-2. Its strength grade, size and form are designed according to the actual situation. The pre-embedded connector connecting plate has reserved bolt holes 4-6 and the internal steel of the column has reserved bolt holes 4-4. The size and number of the holes are determined according to actual needs.

[0037] Specific implementation method six: such as Figure 4As shown, the pre-embedded connector and the internal steel section 4-2 of the column are connected using bolts 4-9. Taking the connection between the pre-embedded connector 3-2 of the foundation and the internal steel section 4-3 of the column as an example, the cross-shaped interval formed by the connecting plate 4-5 of the foundation connector is slightly larger than the thickness of the internal steel section 4-3 of the column. Before connection, the internal steel section 4-3 of the column is inserted into the cross-shaped interval. The pre-reserved bolt holes 4-6 of the connecting plate 4-5 of the foundation connector above the concrete pouring interface 4-7 are aligned with the pre-reserved bolt holes 4-4 of the internal steel section, and then bolts 4-9 are used to connect and tighten them.

[0038] Specific implementation method seven: such as Figure 5 As shown, the precast corrugated steel pipe concrete column 1-2 in the middle can be extended by splicing. The internal steel sections 4-3 of adjacent columns are connected by socket plates 5-1. After aligning the pre-drilled bolt holes 4-4 in the internal steel section 4-3 with the pre-drilled bolt holes 5-2 in the socket plates, bolts 4-9 are used to connect and tighten the connection.

[0039] Specific implementation method eight: Combination Figure 4 , Figure 6 As shown, after the internal steel section 4-3 of the column is spliced ​​with the connecting plate using bolts 4-9, post-concrete pouring and grouting are carried out. For the sake of visual effect, some components are not shown. After the splicing of the reserved cup opening 6-10 node of the foundation is completed, the reinforcing cage 6-11 is placed inside, followed by post-concrete pouring. After the splicing of the reserved cup opening 6-1 node of the cap beam is completed, the baffle 6-2 is installed and connected to the top cap beam 1-1 through the pre-embedded bolts 2-5. The semi-circular corrugated steel pipe connecting plate 6-4 is connected using bolts, so that the semi-circular corrugated steel pipe 6-6 wraps around the corrugated steel pipe 4-2. Then, sealant is applied to prevent grout leakage, and grouting is carried out through the grouting hole 6-3 of the baffle.

[0040] Specific Implementation Method Nine: Combining Figure 5 , Figure 6 As shown, when the precast corrugated steel pipe concrete column 1-2 in the middle is spliced ​​and extended, after the internal steel 4-3 of the column is spliced, the column connector 6-7 is used as a template to complete the grouting. After the connecting plate 6-8 of the column connector is tightened with bolts, the column connector 6-7 wraps around the corrugated steel pipe 4-2, and is sealed with glue to prevent grout leakage. Grouting is then carried out through the grouting hole 6-10 of the column connector.

[0041] Specific implementation method ten: After the internal steel sections 4-3 are spliced, the concrete to be poured and the grout to be injected must have characteristics such as early strength, self-compacting and micro-expansion.

[0042] Detailed Implementation Method Eleven: Combining Figures 1 to 5As shown, the corrugated steel pipe 4-2 in this embodiment is a galvanized corrugated steel pipe with a zinc protective layer electroplated on its surface. When the anti-corrosion requirements are high, it can also be used in conjunction with anti-corrosion coating. Its thickness ranges from 1.0mm to 4.0mm, and its diameter ranges from 600mm to 3000mm. The specific dimensions are determined according to actual needs.

[0043] Specific implementation method 12: When splicing the internal steel section 4-3 of the column with the connecting parts, the thickness of the connecting steel plate shall not be less than the thickness of the web plate of the steel section, and the number of bolts used for splicing shall be calculated and configured according to the design requirements.

[0044] Specific implementation method thirteen: The side length of the reserved square cup opening 6-1 in the cap beam must meet the operating space for bolt tightening, and should not be less than D+400mm (D is the outer diameter of the precast corrugated steel pipe steel-concrete column 1-2 in the middle). The exposed part of the internal steel 4-3 of the column extends into the reserved cup opening of the cap beam by a length not less than D, and the corrugated steel pipe extends into the reserved cup opening of the cap beam by a length not less than 0.25D.

[0045] Specific implementation method fourteen: The baffle 6-2 is provided with baffle grouting holes 6-4. Each baffle 6-2 is connected to a semi-circular corrugated steel pipe, wherein the diameter of the semi-circular corrugated steel pipe is the same as the diameter of the column, the crests and troughs interlock with each other, and the overlap length between the semi-circular corrugated steel pipe and the lower column is not less than 0.5D. After being fastened with bolts, the interface with the top cap beam 1-1 and the column is sealed with glue to prevent grout leakage.

[0046] Specific Implementation Method Fifteen: The radius of the column connector 6-7 used for splicing the precast corrugated steel pipe steel-concrete columns 1-2 in the middle is the same as the diameter of the column. The crests and troughs interlock with each other. The overlap length between the column connector and the upper and lower columns is not less than 0.5D. After fastening with bolts, the interface with the column is sealed with glue to prevent grout leakage.

[0047] Specific implementation method sixteen: The exposed part of the internal steel section 4-3 of the column extends into the reserved cup opening 6-10 of the foundation with a length of not less than 2D, and the corrugated steel pipe 4-2 extends into the reserved cup opening 6-10 of the foundation with a length of not less than 0.5D.

[0048] Specific Implementation Method Seventeen: Corrugated steel plates are used as core molds for the reserved cup opening 6-10 of the foundation cap. After casting, the corrugated steel plates are not removed. The configuration of the internal reinforcing cage 6-11 of the reserved cup opening 6-10 of the foundation cap is determined based on the design values ​​of bending moment and shear force at the bottom of the column base. The stirrups of the reserved cup opening 6-10 of the foundation cap are densely configured at the concrete end interface area of ​​the precast corrugated steel pipe steel-concrete column 1-2 in the middle.

[0049] Specific implementation method 18: The corrugated steel pipe 4-2 used is a galvanized corrugated steel pipe with a thickness range of 1.0mm-8.0mm and a diameter range of 300mm-3000mm. The dimensions of the internal steel section 4-3 of the column are calculated and configured according to the design requirements.

[0050] Construction method of the socket-type corrugated steel pipe concrete bridge pier: The top cap beam 1-1 is prefabricated. During the factory prefabrication process, the cap beam connector 2-2 and the bolt 2-5 are pre-embedded in the top cap beam 1-1. A square cap beam pre-reserved cup 6-1 is reserved at the bottom of the top cap beam 1-1. The bottom longitudinal reinforcement 2-4 of the cap beam is cut at the cup and then bent into a U-shape before extending into the cap beam pre-reserved cup 6-1.

[0051] The corrugated steel pipe steel-concrete composite column 1-2 in the middle is prefabricated and can be spliced ​​and lengthened by using the socket plate 5-1.

[0052] The lower foundation 1-3 is cast-in-place, with pre-embedded connectors. A square socket 6-10 is reserved at the top of the lower foundation 1-3. During on-site construction, the internal steel 4-3 of the central precast corrugated steel-concrete column 1-2 is bolted to the pre-embedded connecting steel plate at the socket 6-10. After splicing, a reinforcing cage 6-11 is placed inside the socket, followed by the pouring of concrete at the socket 6-10. Then, the precast corrugated steel-concrete column is connected to the top cap beam 1-1. Similarly, the internal steel 4-3 of the central precast corrugated steel-concrete column 1-2 is bolted to the pre-embedded connecting steel plate at the cap beam socket. After splicing, a baffle 6-2 is installed for grouting reinforcement.

[0053] Specifically, the following steps are included: Step 1: Precast corrugated steel pipe steel-concrete column 1-2 in the middle: Install the internal steel section 4-3 of the column inside the corrugated steel pipe 4-2, weld a sealing plate with a pouring hole to the column end, and remove the sealing plate after curing to the design strength after pouring; the internal steel section 4-3 of the column is a cross-shaped steel, I-shaped steel or H-shaped steel, which improves the bending bearing capacity of the connection node; Step 2: Fabrication of connectors: Connectors include cap beam connector 2-2, foundation connector 3-2, baffle connector, and column connector 6-7; Step 3: Precast top cap beam 1-1: According to the design, pre-embed cap beam connector 2-2 and bolt 2-5 into top cap beam 1-1. Top cap beam 1-1 has a reserved cap beam socket 6-1. The bottom longitudinal reinforcement 2-4 of the cap beam is cut at the reserved cap beam socket 6-1, then bent into a U-shape and extended into the reserved cap beam socket 6-1. Corrugated steel plate is cut at the reserved cap beam socket 6-1 as the cap beam core mold 2-3. After pouring, it is cured to the design strength. The cap beam core mold 2-3 is not removed. Step 4: Casting of lower foundation 1-3: During on-site construction, lower foundation 1-3 is cast according to the design. Foundation connector 3-2 is pre-embedded in lower foundation 1-3. Foundation 1-3 has a reserved cup 6-10. Corrugated steel plate is cut at the reserved cup 6-10 as foundation core mold 3-1. After casting, it is cured to the design strength. Foundation core mold 3-1 is not removed. Step 5: Node Connection: Transport the precast corrugated steel pipe steel-concrete column 1-2 to the construction site, splice the column to the designed length, insert the internal steel 4-3 of the column into the bearing cap connector 3-2 and align them, then connect them with bolts 4-9 and carry out post-pouring construction. Subsequently, hoist the top cap beam 1-1, insert and align the cap beam connector 2-2 with the internal steel 4-3 of the column, connect them with bolts 4-9 and carry out grouting construction. Step 6: Post-pouring grouting: Insert the steel cage 6-11 into the reserved cup opening 6-10 of the lower foundation 1-3 and carry out post-pouring concrete construction. After the column connector 6-7 and the baffle connector are installed, grouting construction is carried out.

[0054] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A construction method for a socket-type precast corrugated steel pipe concrete bridge pier, characterized in that: Specifically, the construction steps include the following: Step 1: Precast corrugated steel pipe steel-concrete column (1-2) in the middle: Install the internal steel section (4-3) of the column inside the corrugated steel pipe (4-2), weld the sealing plate with the pouring hole to the column end, and remove the sealing plate after curing to the design strength after pouring; the internal steel section (4-3) of the column is a cross-shaped steel, I-shaped steel or H-shaped steel; Step 2: Fabrication of connectors: Connectors include cap beam connector (2-2), foundation connector (3-2), baffle connector, and column connector (6-7). Step 3: Precast top cap beam (1-1): According to the design, embed the cap beam connector (2-2) and screw (2-5) into the top cap beam (1-1). The top cap beam (1-1) has a reserved cup opening (6-1). The bottom longitudinal reinforcement (2-4) of the cap beam is cut off at the reserved cup opening (6-1) and then bent into a U-shape and extended into the reserved cup opening (6-1). Corrugated steel plate is cut at the reserved cup opening (6-1) of the cap beam as the core mold (2-3). After pouring, it is cured to the design strength. The core mold (2-3) of the cap beam is not removed. Step 4: Casting of the lower foundation (1-3): During on-site construction, the lower foundation (1-3) is cast according to the design. The foundation connector (3-2) is pre-embedded in the lower foundation (1-3). The lower foundation (1-3) has a reserved cup opening (6-10). Corrugated steel plates are cut at the reserved cup opening (6-10) to serve as the foundation core mold (3-1). After casting, it is cured to the design strength. The foundation core mold (3-1) is not removed. Step 5: Node Connection: Transport the precast corrugated steel pipe steel-concrete column (1-2) to the construction site, splice the column to the designed length, insert the internal steel (4-3) of the column into the bearing cap connector (3-2) and align them, then connect them with bolts (4-9) and carry out post-pouring construction. Subsequently, hoist the top cap beam (1-1), insert the cap beam connector (2-2) into the internal steel (4-3) of the column and align them, then connect them with bolts (4-9) and carry out grouting construction. Step 6: Post-pouring grouting: Insert the steel cage (6-11) into the reserved cup opening (6-10) of the lower foundation (1-3) and carry out post-pouring concrete construction. After the column connector (6-7) and baffle connector are completed, install them and carry out grouting construction.

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