Construction technology suitable for multi-section assembly type pier

Abstract

The invention relates to a construction technology suitable for a multi-section assembly type pier. The construction technology comprises the following steps that firstly, a bearing platform steel reinforcement framework is bound, a bearing platform is poured on site, and when the bearing platform steel reinforcement framework is bound, prestressed steel bars and positioning embedded parts are embedded; 2, producing a pier prefabricated part and a cover beam prefabricated part; thirdly, a guiding tool is arranged at the positioning embedded part, and the pier and abutment prefabricated part is hoisted to the position of the guiding tool for coarse positioning; fourthly, the prestressed steel bar pipeline in the pier and abutment prefabricated part is aligned with the prestressed steel bar embedded in the bearing platform, the prestressed steel bar is installed from the top of the pier and abutment prefabricated part through the prestressed steel bar pipeline, and the prestressed steel bar is aligned and connected through a quick coupler; fifthly, bedding treatment is conducted on the combined face of the pier and abutment prefabricated part and the bearing platform; and 6, after the pier prefabricated part is installed, the cover beam prefabricated part is placed, and prestress is applied to the upper end of the prestress steel bar or applied to the upper end of the prestress steel bar in a segmented mode.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge equipment, and in particular relates to a construction process suitable for multi-segment assembled bridge piers. Background Art

[0002] Prefabricated bridge piers are a new type of bridge structure with many advantages, such as improving construction efficiency, reducing costs, shortening construction period, and reducing environmental pollution. With the continuous development of prefabricated bridge pier technology, its application scope is also expanding. At present, research and application of prefabricated bridge piers at home and abroad have achieved certain results. For example, in the Changguo Road and Baoshan Road Interchange Bridge Project of the first phase of the urban expressway network in Zibo City, prefabricated prefabricated pier column technology was used for the first time, and the first prefabricated prefabricated pier column was successfully hoisted. The adoption of this technology has greatly improved the assembly rate in the bridge construction process, and the assembly rate of the Baoshan Road project alone can reach 80%.

[0003] In addition, some countries are also actively promoting and applying prefabricated bridge pier technology. For example, the Federal Highway Administration of the United States has proposed the concept of "bridge lifecycle design" to improve the service life and safety of bridges. At the same time, some European countries are also actively promoting and applying prefabricated bridge pier technology to improve the efficiency and quality of bridge construction.

[0004] However, prefabricated bridge piers also have some disadvantages: 1. Poor stress performance: Compared with traditional cast-in-place concrete bridge piers, prefabricated bridge piers have poor stress performance, and measures need to be taken to improve their bearing capacity. 2. High installation accuracy requirements: Prefabricated bridge piers have high installation accuracy requirements. If they are not installed properly, it will affect the overall performance and safety of the bridge. 3. Existing connection methods such as grouting sleeves have disadvantages such as the inability to detect grouting density, high precision requirements, the need for later grouting, and many processes. 4. It is only suitable for single-segment assembly. In the field of multi-segment ultra-high pier assembly, the existing process construction is complex, the safety risks are high, and the connection method is unstable.

[0005] In view of the above problems, the present invention provides a construction process suitable for multi-segment prefabricated piers, which has excellent characteristics such as fast and accurate installation, low precision requirements, simple procedures, and clear force. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a construction process suitable for multi-segment assembled bridge piers, which has the advantages of fast and accurate installation, low precision requirements, simple procedures, clear force, etc. In order to solve the above problems, the technical solution adopted by the present invention is: A construction process applicable to multi-segment assembled bridge piers, comprising the following steps: Step 1: Tie up the steel reinforcement skeleton of the cap, cast the cap on site, embed the prestressed steel bars and positioning embedded parts when tying up the steel reinforcement skeleton of the cap, and position the prestressed steel bars by positioning tooling when embedding them; Step 2: Produce pier prefabricated components and cap beam prefabricated components. When producing pier prefabricated components, the prestressed steel bar pipe is positioned by a positioning tool, rubber sleeves are buried at both ends of the prestressed steel bar pipe, and multifunctional anchor point interfaces are pre-buried at the lower and upper parts of the pier prefabricated components. The multifunctional anchor point interfaces can be used to install jack supports, hoisting parts and guide tooling; Step 3: Set the guide fixture at the location of the embedded positioning parts, connect the lifting parts through the lifting device, lift the pier prefabricated components to the guide fixture position for rough positioning, and after the pier prefabricated components fall into the guide plate of the guide fixture, slowly descend along the guide plate. Leave a space between the pier prefabricated components and the cap to observe whether the prestressed steel rod pipes in the pier prefabricated components and the prestressed steel rods embedded on the cap are aligned; Step 4: After the prestressed steel bar pipe in the pier prefabricated component is aligned with the prestressed steel bar embedded on the cap, the prestressed steel bar is installed from the top of the pier prefabricated component through the prestressed steel bar pipe, and the prestressed steel bar embedded on the cap and the prestressed steel bar installed in the pier prefabricated component are aligned and connected through the quick-release joint, and then the pier prefabricated component is controlled to fall to the designed position, and the jack support is installed on the multi-functional anchor point interface at the bottom of the pier prefabricated component, and the pier prefabricated component is fine-tuned by the jack and the jack support; Step 5: Perform mortar treatment on the joint surface between the pier prefabricated components and the cap; Step 6: After the pier prefabricated components are installed, place the cap beam prefabricated components and apply prestress to the upper end of the top prestressed steel rod, or Prestressing is applied to the precast components of the pier and cap beam in sections.

[0007] As an embodiment of the present invention, when there are multiple prefabricated pier components, in step three, the guide tool is installed on the multifunctional anchor point interface on the upper part of the prefabricated pier component, the upper prefabricated pier component is hoisted to the upper part of the lower prefabricated pier component, the upper prefabricated pier component is roughly positioned by the guide tool, and it is observed whether the prestressed steel bar pipe in the upper prefabricated pier component and the prestressed steel bar pipe in the lower prefabricated pier component are aligned; in step four, after alignment, the prestressed steel bar pipe is inserted from the top of the upper prefabricated pier component through the prestressed steel bar pipe. Install prestressed steel rods through the prestressed steel rod pipeline, and align and connect the prestressed steel rods extending from the top of the lower pier prefabricated component and the prestressed steel rods installed in the upper pier prefabricated component through quick-release joints; then control the pier prefabricated component to fall to the designed position, install jack supports at the multi-functional anchor point interface on the upper part of the lower pier prefabricated component and the multi-functional anchor point interface on the lower part of the upper pier prefabricated component, and fine-tune the pier prefabricated component through the jack and the jack support; install multiple pier prefabricated components in sequence.

[0008] As an implementation mode of the present invention, when installing the prestressed steel bar from the upper end of the prestressed steel bar pipeline, the quick-release joint is first fixed together with the lower end of the prestressed steel bar, and then the prestressed steel bar is passed from top to bottom; when the upper and lower prestressed steel bars are connected, the quick-release joint is directly connected to the upper end of the lower prestressed steel bar.

[0009] As an embodiment of the present invention, after the abutment and pier prefabricated components are assembled, the quick-release joints are located above the joint surfaces between the abutment and pier prefabricated components and between adjacent pier prefabricated components to prevent mortar from pouring into the quick-release joints during mortaring.

[0010] As an embodiment of the present invention, the jack support, the hoisting member and the guide tooling correspond to a common multifunctional anchor point interface, and the jack support, the hoisting member and the guide tooling are installed and removed according to the construction process, or The jack support, the hoisting member and the guide tooling respectively correspond to different multifunctional anchor point interfaces, and the jack support, the hoisting member and the guide tooling can be installed and disassembled at the same time.

[0011] As an embodiment of the present invention, the quick connector includes an inner connector and an outer connector, the inner connector is inserted into the outer connector for use as a set, a threaded hole is provided at one end of the outer connector and a guide is provided at the other end, the guide is bell-mouth-shaped, a small port thereof is provided on the outside of the end of the inner connector, and a large port thereof is provided at the end of the outer connector for introducing the steel bars of the prefabricated component into the inner connector, the outer connector is connected to another outer connector through a connector for completing the splicing of the prefabricated components, and a spring is provided between the inner connector and the connector.

[0012] As an embodiment of the present invention, the positioning tool includes an upper plate and a lower plate, and the upper plate and the lower plate are provided with positioning holes in a one-to-one correspondence, and steel pipes are connected between the corresponding positioning holes on the upper plate and the lower plate.

[0013] As an embodiment of the present invention, the guiding tooling includes an L-shaped positioning plate and a plurality of third reinforcing plates arranged between the horizontal plate and the vertical plate of the positioning plate. A guide plate is fixedly arranged on the top of the positioning plate tilted outward. The positioning plate and the guide plate are provided with clearance grooves corresponding to the jack support members from top to bottom.

[0014] As an embodiment of the present invention, the positioning embedded part is an L-shaped bolt, and the bolt end is vertically exposed. A through hole corresponding to the bolt end of the L-shaped bolt is opened on the horizontal plate of the guide tooling, and the guide tooling is fixed by an L-shaped bolt pair and a nut.

[0015] The beneficial effects of adopting the above technical solution are: The invention provides a construction process suitable for multi-segment assembled piers. The prefabricated components of the piers can be prefabricated in a factory and then transported to the construction site for installation, which greatly shortens the construction period. A large number of automated equipment can be used in the prefabrication process of the prefabricated components of the piers, which reduces labor costs. At the same time, the installation process of the prefabricated components of the piers is simple, which can reduce material waste and cost expenditure. Since the prefabrication and installation processes of the prefabricated components of the piers can be carried out in different sites, the construction period can be greatly shortened and the progress of the project can be improved. Environmentally friendly materials and processes can be used in the prefabrication process of the prefabricated components of the piers, which improves the impact of the construction on the surrounding environment and reduces pollution to the environment. The process has a high degree of standardization, good cost control effect and high construction quality, which improves the appearance quality and physical quality of the project; compared with traditional bridge construction, prefabrication and assembly realize factory-based, rapid and standardized construction, which can not only ensure the quality of the project, but also greatly reduce the construction period and speed up the progress of the project construction; the connection method of the quick-release joint reduces the positioning accuracy, facilitates installation, reduces the docking time of the upper and lower pier prefabricated components, and speeds up the construction progress; the quick-release joint connection method and the combination of prestressed steel bars realize the combined installation of multi-segment pier prefabricated components, which has better safety and stability; the process is simple, and the quick-release joint does not require support formwork and cast-in-place cement and other processes, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the positioning tool in the present invention.

[0018] Figure 3 It is a structural schematic diagram of the jack support member in the present invention.

[0019] Figure 4 It is a structural schematic diagram of the guiding tool in the present invention.

[0020] Figure 5 It is another structural schematic diagram of the guiding tool in the present invention.

[0021] Figure 6 It is a schematic diagram of the main structure of the guiding tool in the present invention.

[0022] Figure 7 It is a structural schematic diagram of the quick-release connector in the present invention.

[0023] Figure 8 It is a schematic diagram of the main structure of the quick-release connector in the present invention.

[0024] Fig. 9 It is a schematic diagram of the internal structure of the inner connector in the quick connector of the present invention.

[0025] Among them: 1 pile foundation, 2 cap, 3 first anchor assembly, 4 prestressed steel rod, 5 quick-release joint, 501 inner connector, 502 outer connector, 503 threaded hole, 504 guide, 505 connector, 506 spring, 507 dividing groove, 508 positioning groove, 509 positioning ring, 510 release cone, 511 center hole, 6 prestressed steel rod pipeline, 7 pier prefabricated component, 8 jack support, 801 support plate, 802 first reinforcement plate, 803 second reinforcement plate, 804 installation hole, 9 cap beam prefabricated component, 10 second anchor assembly, 11 upper plate, 12 lower plate, 13 positioning hole, 14 steel pipe, 15 positioning plate, 16 third reinforcement plate, 17 guide plate, 18 clearance groove, 19 through hole, 20 weight reduction hole, 21 positioning embedded part, 22 rubber sleeve. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is clearly and completely described below in conjunction with specific embodiments.

[0027] like Figure 1 A construction process for multi-segment assembled piers is shown, which includes the following steps: Step 1: Tie up the steel reinforcement skeleton of the cap, cast the cap 2 on site, embed the prestressed steel rod 4 and the positioning embedded parts 21 when tying the steel reinforcement skeleton of the cap, position the prestressed steel rod 4 by the positioning tool, and ensure the top position of the prestressed steel rod 4 is accurate by measuring the elevation; Step 2: Produce the pier prefabricated component 7 and the cap beam prefabricated component 9. When producing the pier prefabricated component 7, the prestressed steel bar pipe 6 is positioned by the positioning tool. Rubber sleeves 22 are buried at both ends of the prestressed steel bar pipe 6 to centrally position the prestressed steel bar 4 for easy installation; multifunctional anchor point interfaces are pre-buried at the lower and upper parts of the pier prefabricated component 7. The multifunctional anchor point interfaces can be used to install jack supports 8, lifting parts and guide tooling. When installing the jack support 8, the jack support 8 is used to provide a support point for the jack. When installing the lifting part, the lifting wire rope is connected to the lifting part to lift the pier prefabricated component 7. The lifting part is always installed at the multifunctional anchor point interface on the upper part of the pier prefabricated component 7; when installing a pier prefabricated component 7, the jack support 8 is only installed at the multifunctional anchor point interface at the lower part of the pier prefabricated component 7, and the guide tooling is installed on the positioning embedded part on the cap 2; Step 3: Set the guide fixture at the positioning embedded part 21, connect the lifting parts through the lifting device, and lift the pier prefabricated component 7 to the position of the guide fixture for rough positioning, which can eliminate the safety risks caused by the construction workers pulling the pier prefabricated component 7, which is a large and heavy component, to swing back and forth by ropes. After the pier prefabricated component 7 falls into the guide plate 17 of the guide fixture, it slowly descends along the guide plate 17. There is a space between the pier prefabricated component 7 and the cap 2, which is used to observe whether the prestressed steel rod pipe 6 in the pier prefabricated component 7 is aligned with the prestressed steel rod 4 embedded on the cap 2; Step 4: After the prestressed steel bar pipe 6 in the pier prefabricated component 7 is aligned with the prestressed steel bar 4 embedded in the cap 2, the prestressed steel bar 4 is installed from the top of the pier prefabricated component 7 through the prestressed steel bar pipe 6, and the prestressed steel bar 4 embedded in the cap 2 and the prestressed steel bar 4 installed in the pier prefabricated component 7 are aligned and connected through the quick-release joint 5, and then the pier prefabricated component 7 is controlled to fall to the designed position, and the jack support 8 is installed on the multifunctional anchor point interface at the bottom of the pier prefabricated component 7. The position, elevation, verticality, etc. of the pier prefabricated component 7 are precisely fine-tuned by the jack and the jack support 8; Step 5: Install a baffle plate at the interface between the pier prefabricated component 7 and the cap 2 to perform mortar treatment; Step 6: After the installation of the pier prefabricated component 7, place the cap beam prefabricated component 9. When the mortar strength of the mortar in step 5 reaches the set requirements, a tensioning machine is arranged at the top of the cap beam prefabricated component 9 or prestress is applied to the upper end of the top prestressed steel rod 4 through a torque wrench to complete the entire construction process.

[0028] In this embodiment, when there are multiple pier prefabricated components 7, in step three, a guiding tool is installed at the multifunctional anchor point interface on the upper part of the pier prefabricated component 7, the upper pier prefabricated component 7 is hoisted to the top of the lower pier prefabricated component 7, and the upper pier prefabricated component 7 is roughly positioned by the guiding tool, and it is observed whether the prestressed steel rod pipe 6 in the upper pier prefabricated component 7 and the prestressed steel rod pipe 6 in the lower pier prefabricated component 7 are aligned; in step four, after alignment, the prestressed steel rod 4 is installed from the top of the upper pier prefabricated component 7 through the prestressed steel rod pipe 6, and the prestressed steel rod 4 extending from the top of the lower pier prefabricated component 7 and the prestressed steel rod 4 installed in the upper pier prefabricated component 7 are aligned and connected through the quick-release joint 5, and then the pier prefabricated component 7 is controlled to fall to the designed position. Jack supports 8 are symmetrically installed at the multifunctional anchor point interface on the upper part of the lower pier prefabricated component 7 and the multifunctional anchor point interface on the lower part of the upper pier prefabricated component 7, and the upper pier prefabricated component 7 is fine-tuned by the jack and the jack support 8; multiple pier prefabricated components 7 are installed in sequence; in step six, when applying prestress, as one application method, after all the pier prefabricated components 7 and the cap beam prefabricated components 9 are installed, prestress is applied to the uppermost prestressed steel rod 4, and as another application method, after each pier prefabricated component 7 is installed, the corresponding prestressed steel rod 4 is subjected to segmented prestressing by anchor plates and anchor nuts, and at this time, the prestressed steel rod 4 is provided with an external thread, and the diameter of the anchor plate and the anchor nut is smaller than the inner diameter of the prestressed steel rod pipe 6.

[0029] The invention provides a construction process for multi-segment assembled piers. The prefabricated pier components 7 can be prefabricated in a factory and then transported to the construction site for installation, which greatly shortens the construction period. A large number of automated equipment can be used in the prefabrication process of the prefabricated pier components 7, which reduces labor costs. At the same time, the installation process of the prefabricated pier components 7 is simple, which can reduce material waste and cost expenditure. Since the prefabrication and installation processes of the prefabricated pier components 7 can be carried out in different sites, the construction period can be greatly shortened and the progress of the project can be improved. Environmentally friendly materials and processes can be used in the prefabrication process of the prefabricated pier components 7, which improves the impact of construction on the surrounding environment and reduces pollution to the environment. The construction process The project has a high degree of standardization, good cost control effect, and high construction quality, which improves the appearance quality and physical quality of the project; compared with traditional bridge construction, prefabrication and assembly realize factory-based, rapid, and standardized construction, which can not only ensure the quality of the project, but also greatly reduce the construction period and speed up the progress of the project construction; the connection method of the quick-release joint 5 reduces the positioning accuracy, facilitates installation, reduces the docking time of the upper and lower pier prefabricated components 7, and speeds up the construction progress; the combination of the quick-release joint 5 connection method and the prestressed steel rod 4 realizes the combined installation of multi-segment pier prefabricated components 7, which has better safety and stability; the process is simple, the quick-release joint 5 does not require processes such as supporting formwork and pouring cement, and is easy to operate.

[0030] When setting the number and position of the multifunctional anchor point interfaces, as an implementation method, the jack support 8, the hoisting part and the guide tooling respectively correspond to different multifunctional anchor point interfaces, and the jack support, the hoisting part and the guide tooling can be installed and disassembled at the same time; as another implementation method, the jack support 8, the hoisting part and the guide tooling correspond to the common multifunctional anchor point interface, and the jack support, the hoisting part and the guide tooling are installed and disassembled on the multifunctional anchor point interface in sequence according to the construction process. This implementation method can reduce the number of multifunctional anchor point interfaces. The setting method of the multifunctional anchor point interface is specifically based on the working method of the on-site installers. In this embodiment, the multifunctional anchor point interface is a threaded sleeve pre-buried in the pier prefabricated component 7, and the jack support 8, the hoisting part and the guide tooling are installed through the threaded sleeve and the connecting bolts.

[0031] As a further optimization, high-strength sealing materials are used between adjacent pier prefabricated components 7 .

[0032] In this embodiment, when installing the prestressed steel bar 4 from the upper end of the prestressed steel bar pipe 6, the quick connector 5 is first fixed to the lower end of the prestressed steel bar 4, and then the prestressed steel bar 4 is passed from top to bottom; when docking the upper and lower prestressed steel bars 4, the quick connector 5 is directly connected to the upper end of the lower prestressed steel bar 4.

[0033] After the cap 2 and the pier prefabricated components 7 are assembled, the quick-release joints 5 are located above the joint surfaces between the cap 2 and the pier prefabricated components 7 and between adjacent pier prefabricated components 7 to prevent mortar from pouring into the quick-release joints 5 during grouting.

[0034] like Figure 7-Figure 9 As shown, the quick connector 5 includes an inner connector 501 and an outer connector 502, the inner connector 501 is sleeved in the outer connector 502 for use as a set, a threaded hole 503 is provided at one end of the outer connector 502, and a guide 504 is provided at the other end, the guide 504 is in a bell-mouth shape, a small end thereof is provided on the outside of the end of the inner connector 51, and a large end thereof is provided at the end of the outer connector 502, for introducing the prestressed steel rod 4 into the inner connector 501, the outer connector 502 is connected to another outer connector 502 through a connector 505, and two prestressed steel rods 4 are spliced ​​together by two groups of outer connectors 502 and inner connectors 501, a spring 506 is provided between the inner connector 501 and the connector 505, for applying an outward thrust to the inner connector 501, so that the inner connector 501 clamps the prestressed steel rod 4.

[0035] The inner connector 501 is a cone with a center hole 511, and the outer connector 502 is provided with a conical hole adapted to the outer contour of the inner connector 501 and the cone angle is slightly smaller than the cone angle of the inner connector 501, and the general difference is within 1°. The cone angles of the inner connector 501 and the outer connector 502 are selected in a coordinated manner within the range of 5 to 25°; the outer end of the inner connector 501 is provided with a release cone 510, which facilitates the guiding installation of the connecting end and prevents stress concentration under stress; the inner connector 501 is provided with a plurality of dividing grooves 507 to divide it into a plurality of fan-shaped clips, and a positioning groove 508 is provided on the inner wall of the center hole 511, and a positioning ring 509 is clamped on the fixed The positioning groove 508 makes the clips of the inner connector 501 coaxial, and the positioning ring 509 is made of elastic metal material; the central hole 511 of the inner connector 501 is a threaded hole or a smooth hole. The hardness of the smooth hole type inner connector 501 is less than that of the non-smooth circular connecting end that meshes with it, and it is mostly used for splicing connecting ends with ribs or threads. The ribs or threads bite into the smooth hole type inner connector 501 to increase the bite area, form a greater bite force, and make the connection more secure; the hardness of the threaded hole type inner connector 501 is greater than that of the smooth circular connecting end that meshes with it, and it can bite into the smooth circular connecting end. The engagement of its thread teeth with the smooth circular connecting end increases the bite area, forms a greater bite force, and makes the connection more secure.

[0036] like Figure 2As shown, the positioning fixture includes an upper plate 11 and a lower plate 12 , and positioning holes 13 are correspondingly provided on the upper plate 11 and the lower plate 12 , and steel pipes 14 are connected between the corresponding positioning holes 13 on the upper plate 11 and the lower plate 12 .

[0037] like Figure 4-Figure 6 As shown, the guide tooling includes an L-shaped positioning plate 15 and a plurality of third reinforcing plates 16 arranged between the horizontal plate and the vertical plate of the positioning plate 15. A guide plate 17 is fixedly provided on the top of the positioning plate 15 tilted outward. The positioning plate 15 and the guide plate 17 are provided with clearance grooves 18 corresponding to the jack support 8 from top to bottom to prevent interference.

[0038] like Figure 1 As shown, the positioning embedded part 21 is an L-shaped bolt, and the bolt end is exposed vertically. A through hole 19 corresponding to the bolt end of the L-shaped bolt is opened on the horizontal plate of the positioning plate 15, and the guide tooling is fixed by the L-shaped bolt and nut. A weight reduction hole 20 is opened on the third reinforcing plate 16. In order to achieve accurate positioning when hoisting the pier prefabricated component 7, at least two guide tools are provided, which are matched with the two adjacent side walls of the pier prefabricated component 7 respectively. In addition, a through hole 19 corresponding to the multi-functional anchor point interface is also opened on the vertical plate of the positioning plate 15, which is used to install the guide tooling on the upper part of the pier prefabricated component 7 through the connecting bolts and the multi-functional anchor point interface.

[0039] The four sides of the pier prefabricated component 7 are provided with jack supports 8 to facilitate fine adjustment of the position of the pier prefabricated component 7 .

[0040] like Figure 3 As shown, the jack support member 8 includes a horizontally arranged support plate 801, a first reinforcing plate 802 vertically fixed at the edge of the support plate 801, and a second reinforcing plate 803 arranged between the support plate 801 and the first reinforcing plate 802, the second reinforcing plate 803 is respectively perpendicular to the support plate 801 and the first reinforcing plate 802, and a plurality of mounting holes 804 are arranged on the first reinforcing plate 802, and the jack support member 8 is installed on the threaded sleeve through the mounting holes 804 and connecting bolts.

[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction process applicable to multi-segment assembled bridge piers, characterized in that: It includes the following steps: Step 1: Tie up the steel reinforcement skeleton of the cap, cast the cap on site, embed the prestressed steel bars and positioning embedded parts when tying up the steel reinforcement skeleton of the cap, and position the prestressed steel bars by positioning tooling when embedding them; Step 2: Produce pier prefabricated components and cap beam prefabricated components. When producing pier prefabricated components, the prestressed steel bar pipe is positioned by a positioning tool, rubber sleeves are buried at both ends of the prestressed steel bar pipe, and multifunctional anchor point interfaces are pre-buried at the lower and upper parts of the pier prefabricated components. The multifunctional anchor point interfaces can be used to install jack supports, hoisting parts and guide tooling; Step 3: Set the guide fixture at the location of the embedded positioning parts, connect the lifting parts through the lifting device, lift the pier prefabricated components to the guide fixture position for rough positioning, and after the pier prefabricated components fall into the guide plate of the guide fixture, slowly descend along the guide plate. Leave a space between the pier prefabricated components and the cap to observe whether the prestressed steel rod pipes in the pier prefabricated components and the prestressed steel rods embedded on the cap are aligned; Step 4: After the prestressed steel bar pipe in the pier prefabricated component is aligned with the prestressed steel bar embedded on the cap, the prestressed steel bar is installed from the top of the pier prefabricated component through the prestressed steel bar pipe, and the prestressed steel bar embedded on the cap and the prestressed steel bar installed in the pier prefabricated component are aligned and connected through the quick-release joint, and then the pier prefabricated component is controlled to fall to the designed position, and the jack support is installed on the multi-functional anchor point interface at the bottom of the pier prefabricated component, and the pier prefabricated component is fine-tuned by the jack and the jack support; Step 5: Perform mortar treatment on the joint surface between the pier prefabricated components and the cap; Step 6: After the pier prefabricated components are installed, place the cap beam prefabricated components and apply prestress to the upper end of the top prestressed steel rod, or Prestressing is applied to the precast components of the pier and cap beam in sections.

2. The construction process for multi-segment assembled piers according to claim 1 is characterized by: When there are multiple prefabricated pier components, in step three, the guide tooling is installed on the multifunctional anchor point interface on the upper part of the prefabricated pier component, the upper prefabricated pier component is hoisted to the upper part of the prefabricated pier component below, the upper prefabricated pier component is roughly positioned by the guide tooling, and it is observed whether the prestressed steel bar pipe in the upper prefabricated pier component and the prestressed steel bar pipe in the lower prefabricated pier component are aligned; in step four, after alignment, the prestressed steel bar is installed from the top of the upper prefabricated pier component through the prestressed steel bar pipe, and the prestressed steel bar extending from the top of the lower prefabricated pier component and the prestressed steel bar installed in the upper prefabricated pier component are aligned and connected by the quick-release joint, and then the prefabricated pier component is controlled to fall to the designed position, and the jack support is installed at the multifunctional anchor point interface on the upper part of the lower prefabricated pier component and the multifunctional anchor point interface on the lower part of the upper prefabricated pier component, and the prefabricated pier component is fine-tuned by the jack and the jack support; and multiple prefabricated pier components are installed in sequence.

3. A construction process applicable to multi-segment assembled bridge piers according to claim 1 or 2, characterized in that: When installing the prestressed steel bar from the upper end of the prestressed steel bar pipeline, first fix the quick-release joint to the lower end of the prestressed steel bar, and then insert the prestressed steel bar from top to bottom; when connecting the upper and lower prestressed steel bars, directly connect the quick-release joint to the upper end of the lower prestressed steel bar.

4. The construction process for multi-segment assembled piers according to claim 3 is characterized by: After the prefabricated components of the cap and the pier are assembled, the quick-release joints are located above the joint surfaces between the cap and the pier and between adjacent prefabricated components of the pier to prevent mortar from pouring into the quick-release joints during mortaring.

5. The construction process for multi-segment assembled bridge piers according to claim 2 is characterized by: The jack support, hoisting part and guide tooling correspond to the common multifunctional anchor point interface, and the jack support, hoisting part and guide tooling are installed and removed according to the construction process, or The jack support, the hoisting member and the guide tooling respectively correspond to different multifunctional anchor point interfaces, and the jack support, the hoisting member and the guide tooling can be installed and disassembled at the same time.

6. The construction process for multi-segment assembled bridge piers according to claim 2 is characterized by: High-strength sealing materials are used between adjacent pier prefabricated components.

7. The construction process for multi-segment assembled bridge piers according to claim 1 is characterized by: The quick connector includes an inner connector and an outer connector, wherein the inner connector is inserted into the outer connector for use as a set, a threaded hole is provided at one end of the outer connector and a guide is provided at the other end, the guide is in a bell-mouth shape, a small port thereof is provided at the outside of the end of the inner connector, and a large port thereof is provided at the end of the outer connector for introducing the steel bars of the prefabricated component into the inner connector, the outer connector is connected to another outer connector via a connector for completing the splicing of the prefabricated components, and a spring is provided between the inner connector and the connector.

8. The construction process for multi-segment assembled bridge piers according to claim 1 is characterized by: The positioning tool comprises an upper plate and a lower plate, the upper plate and the lower plate are provided with positioning holes in a one-to-one correspondence, and steel pipes are connected between the corresponding positioning holes on the upper plate and the lower plate.

9. The construction process for multi-segment assembled bridge piers according to claim 1, characterized in that: The guide tooling includes an L-shaped positioning plate and a plurality of third reinforcing plates arranged between the horizontal plate and the vertical plate of the positioning plate. A guide plate is fixedly arranged on the top of the positioning plate tilted outward. The positioning plate and the guide plate are provided with clearance grooves corresponding to the jack supports from top to bottom.

10. The construction process for multi-segment assembled bridge piers according to claim 9, characterized in that: The positioning embedded part is an L-shaped bolt, and the bolt end is vertically exposed. A through hole corresponding to the bolt end of the L-shaped bolt is opened on the horizontal plate of the guide tooling, and the guide tooling is fixed by the L-shaped bolt pair and the nut.

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