Segmented hollow thin-walled precast pier column ground longitudinal connecting device and construction method thereof

Abstract

The application belongs to a kind of segmented hollow thin-walled precast pier ground longitudinal connecting device and its construction method, the device is composed of several pier support moving frame, turnover table and pouring table, located on the flat ground on the side of the completed pier base, close to the side of the pier base, the turnover table, several pier support moving frames supporting the bottom pier, pouring table, several pier support moving frames supporting the top pier are sequentially arranged outside, the exposed butt joint steel bars at the butt joint of each pier on the device are connected with the longitudinal steel bars in the pier body, and then the site completes the pouring of reinforced concrete, the whole pier is erected on the site turnover table and installed with the pier base. The application has the advantages of fast connection and fixation of two-section piers on the ground, good ground operation safety, simplicity, speed, labor saving, entity butt joint surface connection tightness and good firmness.

Description

Technical Field

[0001] This invention relates to a segmented hollow thin-walled precast pier column ground longitudinal connection device and its construction method. Background Technology

[0002] Small-sized hollow piers (usually referring to those with smaller cross-sectional dimensions, less than 2.5×2.5m) are widely used in bridge engineering, commonly found in viaducts, interchanges, and mountainous highways. For example, the G1816 Wuma Expressway Hesai is located in Gannan Tibetan Autonomous Prefecture, at an altitude of 3100-3600m, in a remote and complex mountainous area with limited transportation conditions. For instance, part of the structure of the Laikuhe No. 4 Bridge could only be prefabricated in sections at a ground prefabrication yard and installed on-site. A total of 94 ground-prefabricated piers were constructed, with dimensions of 1.4×1.4m and 1.6×1.6m, a wall thickness of 32cm, and a height of 24-30m. They were formed by connecting 2-3 sections of prefabricated piers, each 10-12m long, and were all small-sized hollow pier structures.

[0003] Currently, all precast hollow piers are prefabricated at the prefabrication yard and then transported to the construction site in sequence. A crane lifts the bottom pier to align its lower end with the foundation of the construction site, meeting design requirements. Then, the lower end of the upper pier is aligned with the upper end of the bottom pier, and this process is repeated to complete the hollow pier assembly. Currently, the upper and lower ends of the two connected hollow piers, as well as the upper and lower connecting ends of the bottom pier, are all hollow pier surfaces. Several lower ports of connecting sleeves are located in the middle of the pier wall on the lower end of each pier. The upper end of each connecting sleeve is connected to the longitudinal reinforcing bars inside the corresponding pier. Grouting pipes are located on the upper and lower sides of each connecting sleeve, communicating with the corresponding outer surface of the pier wall. Several exposed butt reinforcing bars are provided on the middle part of the pier wall on the upper end face of each pier column, corresponding to the lower end of each butt sleeve. Several exposed butt reinforcing bars are also provided on the pier base corresponding to the lower end of each butt sleeve of the bottom precast pier column. When adjacent hollow pier columns are butted together, and when the bottom pier column is butted together with the pier base, after each exposed butt reinforcing bar in the pier wall on the upper end face of the bottom pier column is inserted into the corresponding butt sleeve on the lower end face of the upper pier column, cement grout is pressed in through the grouting pipe. After the pressed cement grout overflows from the overflow pipe, the grouting is stopped. After the cement grout solidifies, the butt joint of the two precast hollow pier columns is completed. The butt joint of the bottom pier column and the pier base is done in the same way.

[0004] Connecting two precast hollow piers vertically in mid-air presents a construction challenge. Existing technology for connecting them vertically in mid-air involves: erecting a clamp on the upper perimeter of the bottom pier; constructing a ladder scaffold on the side of the bottom pier; and using the upper end of the ladder scaffold to form a construction platform on the top of the bottom pier. The prefabricated clamp provides reaction force for adjusting the jacks, which is used to adjust the verticality of the upper pier. After the upper pier is connected to the upper end of the bottom pier in mid-air, a compressive force is created by setting threaded steel bars between the corbel and the clamp, thereby achieving temporary fixation and preventing overturning. The problems with the connection of adjacent hollow piers are: (1) high-altitude operation, which is dangerous; (2) the construction process of building ladders and scaffolds and setting up tie rods between the corbels and clamps is complicated and labor-intensive; (3) when the upper and lower ends of the hollow piers are connected in the air, the exposed connecting steel bars are inserted into the corresponding connecting sleeves on the lower end of the upper precast pier, which is complicated and labor-intensive, and the two joints are not sealed tightly, the pressure of the upper part is uneven, there are many cracks at the connection and the firmness is poor. Summary of the Invention

[0005] The purpose of this invention is to provide a segmented hollow thin-walled precast pier column ground longitudinal connection device and its construction method to solve the problems mentioned in the background art. It has the advantages of rapid connection and fixation of two pier columns on the ground, ground operation during construction, good safety, simplicity and speed, labor saving, and good solid connection and firmness of the solid mating surface.

[0006] Therefore, a segmented hollow thin-walled precast pier column ground longitudinal connection device is provided, including a pier column support moving frame, characterized in that: the segmented hollow thin-walled precast pier column ground longitudinal connection device is composed of several pier column support moving frames, a turning platform and a pouring platform, located on a flat ground on one side of the pier column base that has been completed on site, and a turning platform, several pier column support moving frames for supporting and moving the bottom pier, a pouring platform and several pier column support moving frames for supporting and moving the top pier are arranged outward from the side close to the pier column base; Alternatively, the segmented hollow thin-walled precast pier column ground longitudinal connection device is located on a flat ground on one side of the pier column base that has been completed on site. From the side close to the pier column base outward, there are a flipping platform, several pier column support moving frames that support and move the bottom pier, a pouring platform, several pier column support moving frames that support and move the middle pier, a pouring platform, and several pier column support moving frames that support and move the top pier.

[0007] As a further description of the above technical solution: the aforementioned pier support moving frame is used to support the movement of each precast pier to complete the longitudinal docking on the ground. The pier support moving frame is composed of several support moving frames that are longitudinally distributed at intervals. Each support moving frame consists of a rectangular steel frame, several rollers and several hydraulic lifting feet. Several rollers are arranged laterally at intervals on the upper end face of the rectangular steel frame. The two sides of each roller are connected to the bearing seats on the corresponding side of the rectangular steel frame through axles. Several hydraulic lifting feet are arranged at intervals at the lower end of the rectangular steel frame. The telescopic rods of the hydraulic lifting feet are set downwards, and the lower end of the telescopic rods is provided with force-shaping pads.

[0008] As a further description of the above technical solution: The aforementioned tilting platform is used to cooperate with the lifting device to vertically erect the assembled pier column after docking. The upper surface of the base of the tilting platform is provided with a flip plate. The front end of the flip plate is bent upward along the edge to form a right angle to form a locking edge. The lower part of the front end of the flip plate and the upper part of the front end of the base are connected to the rod shaft through a bearing seat. Several hydraulic lifting feet are provided at intervals around the lower end of the base. The telescopic rods of the hydraulic lifting feet are set downward, and the lower end of the telescopic rods is provided with force-shaping pads.

[0009] As a further description of the above technical solution: the casting platform is used to support the joint surfaces of each precast pier column to complete the on-site joint. The upper surface of the casting platform is provided with a bottom template, or the upper surface of the casting platform is a flat bottom template. The horizontal sides of the casting platform are provided with clips for the lower side of the side template to clamp the column. The lower perimeter of the casting platform is provided with several hydraulic lifting legs at intervals. The telescopic rods of the hydraulic lifting legs are set downwards, and the lower end of the telescopic rods is provided with force-sharing pads. The length of the casting platform is greater than the length of the joint surface of each precast pier column. The width of the casting platform is adapted to the width of the joint bottom surface of each precast pier column. The left and right side templates are clamped on the horizontal sides of the casting platform. The horizontal sides of the upper template are clamped on the upper ends of the left and right side templates. The longitudinal sides of the inner template are respectively inserted into the hollow holes of the pier columns in the joint surfaces of the two pier columns on the casting platform.

[0010] As a further description of the above technical solution: the inner template is a rectangular foam plastic body, the perimeter shape of the inner template is the same as the shape of the hollow hole of the pier column, the longitudinal end faces of the inner template are provided with tie plates, the two tie plates in the rectangular foam plastic body are provided with tensioning steel bars, the outer side of the two tie plates is provided with tie rings, and the longitudinal length of the inner template is greater than the length of the pouring platform.

[0011] As a further description of the above technical solution: the longitudinal pier wall joint surfaces of the middle pier and the top pier are provided with corresponding exposed butt rebar heads.

[0012] A construction method for longitudinally connecting piers on the construction ground using a segmented hollow thin-walled precast pier longitudinal connection device includes the following steps: (1) Fabricate several pier support mobile frames, pouring platforms and turning platforms for the longitudinal connection device and transport them to the construction site; Level the ground on one side of the pier foundation that has been completed. On the leveled ground on one side of the pier foundation, if the bottom pier and the top pier are connected, then from the ground near the pier foundation, there are a turning platform, several pier support moving frames to support and move the bottom pier, a pouring platform, and several pier support moving frames to support and move the top pier. When the bottom pier and the middle pier, and the middle pier and the top pier are connected, a turning platform, several pier support moving frames to support and move the bottom pier, a pouring platform, several pier support moving frames to support and move the middle pier, a pouring platform, and several pier support moving frames to support and move the top pier are arranged outwards on the ground near the pier base. Adjust the hydraulic lifting outriggers at the lower end of each pier support frame to make the upper surfaces of each pier support frame, pouring platform and tilting platform on the same plane. Then, set several support blocks between the lower surface of the support frame, the lower surface of the pouring platform and the lower surface of the tilting platform on the side of each hydraulic lifting outrigger of each pier support frame, pouring platform and tilting platform and the ground. (2) The precast hollow piers that have been precast in the prefabrication yard are transported to the construction site in sequence. The bottom pier is lifted by a crane so that the lower part of the same width side of the bottom pier is placed on a flip plate with a flipping platform near the pier base. The rear end of the side of the bottom pier is against the inner side of the top edge of the flip plate. The lower end of the middle side of the bottom pier is located on the rollers on the pier support moving frame that supports the bottom pier. The lower front side of the bottom pier is located on the longitudinal edge of the bottom template on the opposite side of the pouring platform. The exposed bottom rebar head on the pier wall of the front of the bottom pier is located in the upper space of the pouring platform. The inner template is inserted into the hollow hole of the pier at the front of the bottom pier. The top pier is lifted by a crane so that the lower part of the same width side of the top pier is placed on the rollers of several pier support moving frames that support the top pier on the other side of the pouring platform. The lower front side of the joint surface of the top pier is located on the bottom template edge of the longitudinal side of the pouring platform. The exposed joint steel bar head on the joint surface wall of the front of the top pier is located in the upper space of the pouring platform. The hydraulic lifting outriggers and support blocks at the lower end of each pier support moving frame are readjusted and adjusted again to ensure that the upper surfaces of each pier support moving frame, pouring platform and tilting platform are on the same plane and the center lines of each pier are on the same straight line. The hydraulic lifting outriggers and support blocks bear the weight of each pier support moving frame, pouring platform and tilting platform. When three piers are connected, the bottom pier and the middle pier, and the middle pier and the top pier, the bottom side of the bottom pier is located on the flipping platform on the ground on one side of the foundation, one side of the bottom pier is located on the bottom pier support frame, the docking surface of the bottom pier is located on the pouring platform near the foundation, one side of the middle pier is located on the middle pier support frame, the docking surface of the middle pier that docks with the docking surface of the bottom pier is located on the other side of the same pouring platform, the two docking surfaces of the middle pier and the top pier are located on the corresponding side of another pouring platform away from the foundation, and one side of the top pier is located on the top pier support frame. (3) Use steel bar butt sleeves to connect the corresponding exposed butt steel bar heads on the two butt surfaces of the same casting platform. Tie several horizontal steel bars at intervals on the lower outer side and exposed butt steel bar heads to form a steel bar mesh at the butt surface of the two butt columns. Roughen the butt surface of the two butt columns. Wrap the outer wall of the inner template with release plastic cloth, apply release agent to the inner surfaces of the bottom, left, right and top templates, and pull the inner template into the hollow hole space of the designed pier column on the joint surface of the two docking piers on the same pouring platform. Place the left and right templates and the top template located above the left and right templates on the horizontal sides of the pouring platform. The two sides of the left, right and top templates are respectively attached to the corresponding sides of the joint surface of the two docking piers. (4) Pour concrete cement mortar into the concrete pouring space with steel mesh frame formed by the bottom, left and right side templates, top and inner templates and the joint wall of the two docking columns from each pouring port of the upper template. Vibrate and compact the concrete cement mortar through each pouring port. After the poured concrete cement mortar reaches the demolding strength, remove the left and right side templates, top and inner templates, and cure the concrete poured at the joint of the two docking columns to reach the set strength. Complete the longitudinal ground joint construction of the docking surface of the docking columns to form an integral pier column. (5) Construction of the connection between the lower end of the integral pier and the pier base: A cross mark is pasted 30cm away from the top of the integral pier to measure the verticality of the integral pier installation. Two winch cranes are set up on the ground at the rear ends of the pier base. The hooks of the two winch cranes are fixed to the upper left and right sides of the integral pier. Heavy cranes are set up on the ground at the rear ends of the pier base. The hooks of the heavy cranes are fixed to the top of the integral pier. The cement surface of the lower end of the integral pier and the pier base is roughened. The two winch cranes and the heavy cranes work together to slowly lift the upper part of the flat integral pier onto the turning platform until the central axis of the integral pier is at an angle of 85° to 90° with the horizontal ground. During the hoisting, a total station is set up on the ground corresponding to the front and side of the integral pier at the designed position. The deviation of the integral pier is adjusted at any time during the hoisting process so that the alignment mark in the middle of the side of the integral pier on the same side is on the same straight line and the midpoint of the cross mark is at the designed midpoint position. (6) Use a heavy-duty crane to lift the lower end of the vertical integral pier column onto the pier base. Place a layer of mortar on the pier base corresponding to the lower end of the integral pier column. Adjust the verticality using three brackets and three jacks at the lower end of each side of the integral pier column. The verticality correction error is 1mm. The brackets are made of welded steel plates with reinforcing ribs on both sides. The brackets are connected to the pier column using a sleeve injection and overflow port, using 10.9 grade M20 bolts. After the integral pier column is finely adjusted, set up guy ropes around it to ensure the stability of the pier column. Then, grout is injected into the sleeve at the bottom of the integral pier column. The grouting material is C100 high-strength non-shrink cement grouting material. Grouting can only be carried out after the foundation mortar has reached its final set. The grout is injected from the lower grouting hole until grout flows out from the upper grout outlet. Seal the inlet and outlet ports to complete the connection and installation of the integral pier column and the pier base.

[0013] As a further description of the above technical solution: when the bottom pier is connected to the top pier, or when the bottom pier is connected to the middle pier, or when the middle pier is connected to the top pier, the center lines of each pier are on the same straight line.

[0014] As a further description of the above technical solution: the inner template is pulled to the hollow hole space of the pier column on the same casting platform. The inner template is first placed in the hollow hole of the pier column on one side of the docking surface of the docking pier column. The pull rings in the middle of the two outer sides of the inner template are respectively connected to one end of the respective pull rope, and the other end of each pull rope passes through the central hole of the corresponding pier column.

[0015] As a further description of the above technical solution: the docking construction when the bottom pier and the middle pier, and the middle pier and the top pier are connected can be carried out simultaneously or sequentially.

[0016] The present invention has the following beneficial effects: 1. This invention solves the shortcomings of existing high-altitude jointing methods for connecting two precast hollow piers, which involve high construction risks, the need for high-altitude scaffolding and clamps, complex and labor-intensive construction, and poor joint stability. This invention completes the jointing of two precast hollow piers on the ground, eliminating the dangers of high-altitude operations. It also addresses the shortcomings of complex and labor-intensive construction and poor joint stability by allowing two pier sections to be quickly connected and fixed on the ground. The construction process is ground-based, safe, simple, fast, labor-saving, and the solid joint surface is firm with good joint stability. This invention replaces the traditional construction method where one end of the joint surface of two pier columns is a sleeve and the other end is an exposed rebar head. The exposed rebar head is inserted into the sleeve and then cement mortar is poured in, causing the rebar at the joint to be blocked, resulting in poor joint strength. This invention uses corresponding exposed rebar heads on both joint surfaces of the pier columns, connected by a rebar joint sleeve. This allows the longitudinal rebar within the two columns to be continuously connected through the exposed rebar heads on the joint surface. The joint surface of the two pier columns is cast in place, significantly enhancing its strength. Preliminary tests show that the lateral impact resistance at the joint surface of the two pier columns is increased by 50%–55% compared to the traditional structure, demonstrating better joint strength.

[0017] 2. This invention has low operating costs, is easy to construct, and requires fewer construction personnel, saving 10% to 15% of construction costs and shortening the construction period by 10% to 12%. The process of this invention is simple and easy to master. This invention has good usage effects and has the advantages of saving labor and effort during construction, simple construction, fast speed, saving materials, high efficiency and strong practicality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ground longitudinal connection device of the present invention; Figure 2 This is a top view of the ground longitudinal connection device of the present invention; Figure 3 This is a schematic diagram of the structure of the tilting table of the present invention; Figure 4 This is a schematic diagram of the structure when the upper pier and the bottom pier of the present invention are connected; Figure 5 This is a schematic diagram of the structure at both ends of the top and upper pier columns of the present invention; Figure 6 This is a schematic diagram of the inner template structure of the present invention; Figure 7 This is a schematic diagram of the structure of the lower end of the integral pier column of the present invention when it is adjusted on the pier column base; Figure 8 This is a schematic diagram of the structure when the pier base and the lower end face of the integral pier are in contact. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. To facilitate understanding of the technical means, creative features, and achieved objectives and effects of the present invention, the present invention will be further elaborated below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of the present invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments without creative effort are all within the protection scope of the present invention. Unless otherwise specified, the construction methods in the following embodiments are conventional methods. Unless otherwise specified, the materials, devices, equipment, etc., used in the following embodiments can be obtained commercially.

[0020] This invention only relates to the ground connection of each precast hollow pier, namely the connection between the top pier and the bottom pier, the connection between the middle pier and the top pier, and the connection between the lower end of the bottom pier and the pier base. It does not involve the connection between the upper end of the top pier and the cap beam.

[0021] Example 1: As Figures 1 to 8 As shown, a segmented hollow thin-walled precast pier longitudinal connection device includes a pier support moving frame. The segmented hollow thin-walled precast pier longitudinal connection device consists of several pier support moving frames 1, a turning platform 3, and a pouring platform 2. It is located on a flat ground on one side of the pier base 100 that has been completed on site. From the side close to the pier base, the device is arranged in sequence as follows: turning platform 3, several pier support moving frames 1 that support and move the bottom pier 5, pouring platform 2, and several pier support moving frames that support and move the top pier.

[0022] like Figures 1 to 2 As shown, the pier support mobile frame 1 is used to support the movement of precast piers to complete the longitudinal connection with the ground. The pier support mobile frame 1 consists of several support mobile frames distributed longitudinally at intervals. Each support mobile frame is composed of a rectangular steel frame 18, several rollers 11, and several hydraulic lifting legs 6. The rollers 11 are arranged laterally at intervals on the upper surface of the rectangular steel frame, with a distance of 6-20cm between adjacent rollers 11. The two sides of each roller 11 are connected to the fixed bearings on the corresponding rectangular steel frame via shafts 10. Several hydraulic lifting legs 6 are arranged at intervals at the lower end of the rectangular steel frame. The telescopic rods 61 of the hydraulic lifting legs are set downwards, and the lower end of the telescopic rod is equipped with a force-distributing pad 17 to distribute the pressure. The length of the pier support mobile frame 1 is 2-3m, and the width is adapted to the width of the pier.

[0023] like Figure 3As shown, the tilting platform 3 is used in conjunction with the lifting device to vertically erect the assembled pier column. The upper surface of the base 34 of the tilting platform is provided with a flip plate 30. The front end of the flip plate is bent upward at a right angle to form a locking edge 31, which is used to lock the bottom side of the assembled pier column. The lower front end of the flip plate 30 is axially connected to the upper front end of the base via a bearing 33 and a rod shaft 32. Several hydraulic lifting legs 6 are provided at intervals around the lower perimeter of the base. The telescopic rods of the hydraulic lifting legs are set downward, and the lower end of the telescopic rods is provided with a force-shaping pad.

[0024] like Figures 1 to 4 As shown, the casting platform 2 is used to support the joint surfaces of each precast pier column to complete the on-site connection. The upper surface of the casting platform is provided with a bottom template 21, or the upper surface of the casting platform is a flat surface forming the bottom template 21. The horizontal sides of the casting platform are provided with lugs 20 for the lower sides of the left and right templates to be engaged with the locking columns 16. Several hydraulic lifting legs are provided at intervals around the lower perimeter of the casting platform. The telescopic rods of the hydraulic lifting legs are set downwards, and the lower ends of the telescopic rods are provided with force-sharing pads. The length of the casting platform is greater than the length of the joint surface of each precast pier column, and the width of the casting platform is adapted to the width of the joint bottom surface of each precast pier column. The left template 12 and the right template are secured to the lugs 20 on the horizontal sides of the casting platform by the locking columns 16. The upper template 15 is secured to the upper ends of the left and right templates on both sides of the horizontal side. The upper formwork 15 is provided with a pouring port 14, which is used to pour concrete cement mortar into the concrete pouring space with steel mesh frame formed by the bottom, left and right side formwork, upper and inner formwork and the joint wall of the two connecting pier columns on the pouring platform, and to compact the concrete cement mortar through each pouring port.

[0025] like Figure 5 As shown, the longitudinal pier walls of the middle pier and the top pier 4 are provided with corresponding exposed butt-joint steel bar ends 41. The bottom pier 5, which connects with the ground pier base 100, still adopts the traditional structure.

[0026] When the two piers are poured and joined, the longitudinal sides of the inner formwork 9 are inserted into the hollow holes 52 of the piers on the pouring platform. The inner formwork 9 is a rectangular foam plastic body, and its perimeter shape is the same as that of the hollow holes of the piers. Tie plates 90 are provided on both longitudinal ends of the inner formwork. Several tension bars 91 are provided between the two tie plates within the rectangular foam plastic body. The two ends of the tension bars 91 are fixed to the corresponding tie plates 90 to bear the tension of the tie plates. Pull rings 92 are provided in the middle of the outer sides of the two tie plates to connect one end of a pull rope 93. The pull rope 93 is used for manual movement of the inner formwork within the hollow holes 52 of the piers. The longitudinal length of the inner formwork is greater than the length of the pouring platform.

[0027] The pier support moving frame 1, the force distribution pad 17, the tilting platform 3 and the pouring platform 2 are all made of steel of a certain thickness, such as steel plates and square steel.

[0028] To distribute the load-bearing force of the hydraulic lifting outriggers 6 at the lower ends of the pier support mobile frame 1, the tilting platform 3, and the pouring platform 2, several support blocks 8 of different heights are also provided. The support blocks 8 are made of cement concrete and are supported between the corresponding lower end surfaces of the pier support mobile frame 1, the tilting platform 3, and the pouring platform 2 and the ground to distribute the pressure.

[0029] A construction method for longitudinally connecting piers on the construction ground using a segmented hollow thin-walled precast pier longitudinal connection device includes the following steps: (1) Fabricate several pier support mobile frames 1, pouring platform 2 and turning platform 3 for longitudinal connection device, and transport them to the construction site; The ground on one side of the completed pier foundation 100 is leveled. On the leveled ground on one side of the pier foundation, if the bottom pier 5 and the top pier 4 are joined together, then from the ground closest to the pier foundation 100 outwards, there are sequentially arranged a turning platform, several pier support frames for moving the bottom pier, a pouring platform, and several pier support frames for moving the top pier. The number of pier support frames is based on the convenience of moving a precast pier, usually one at each end and one in the middle of a precast pier.

[0030] Adjust the hydraulic lifting outriggers at the lower end of each pier support frame to make the upper surfaces of each pier support frame, pouring platform, and tilting platform on the same plane. Then, set several support blocks 8 between the lower surface of the support frame, the lower surface of the pouring platform, and the lower surface of the tilting platform on the side of each hydraulic lifting outrigger of each pier support frame, pouring platform, and tilting platform and the ground to distribute the pressure.

[0031] (2) The precast hollow piers that have been precast in the prefabrication yard are transported to the construction site in sequence. The bottom pier 5 is lifted by a crane so that the lower part of the same width side of the bottom pier 5 is placed on a flip plate with a flipping platform near the pier base. The rear end of the side of the bottom pier is against the inner side of the top edge of the flip plate. The lower end of the middle side of the bottom pier is located on the rollers on the pier support moving frame that supports the bottom pier. The lower front side of the bottom pier is located on the longitudinal edge of the bottom formwork on the opposite side of the pouring platform. The exposed butt rebar head 54 on the pier wall of the front butt joint of the bottom pier is located in the upper space of the pouring platform. The inner formwork 9 is inserted into the hollow hole of the pier at the front butt joint of the bottom pier.

[0032] The top pier 4 is lifted by a crane so that the lower part of the same width side of the top pier is placed on the rollers of several pier support moving frames that support the top pier on the other side of the pouring platform. The lower front side of the joint surface of the top pier is located on the bottom template edge of the corresponding side of the pouring platform in the longitudinal direction. The exposed joint steel bar head 41 on the joint surface pier wall at the front of the top pier is located in the upper space of the pouring platform.

[0033] The hydraulic lifting outriggers and support blocks at the lower end of each pier support frame are readjusted and adjusted again to ensure that the upper surfaces of each pier support frame, pouring platform, and tilting platform are on the same plane and the center lines of each pier are on the same straight line. The hydraulic lifting outriggers and support blocks bear the weight of each pier support frame, pouring platform, and tilting platform.

[0034] When the bottom pier connects to the top pier, or the bottom pier connects to the middle pier, or the middle pier connects to the top pier, the center lines of each pier are on the same straight line.

[0035] (3) Connect the corresponding exposed butt rebar ends 41 or lower exposed butt rebar ends 54 on the two butt joint surfaces of the same casting platform 2 using rebar butt sleeves 7. Tie several transverse rebars 55 at intervals on the lower exposed butt rebar ends 54 and the exposed butt rebar ends 41 on the outer side to form a rebar mesh at the butt joint surfaces of the two butt joint columns. Roughen the butt joint surfaces of the two butt joint columns to facilitate bonding with the poured concrete cement mortar.

[0036] Wrap the outer wall of the inner template with release plastic sheeting. Apply release agent to the inner surfaces of the bottom, left, right, and top templates. Pull the inner template 9 to the designed hollow hole space of the pier column at the joint surface of the two connecting pier columns on the same pouring platform. That is, first insert the inner template 9 into the hollow hole of the pier column on one side of the joint surface of the connecting pier. Connect one end of each pull rope 93 to the pull ring in the middle of the two longitudinal outer sides of the inner template. The other end of each pull rope passes through the central hole of the corresponding pier column. Pulling the pull rope of the inner template in the direction of movement moves the inner template within the hollow hole space of the pier column. Reversing the direction of movement removes the inner template. The inner template forms a hollow hole at the joint column that communicates with the hollow holes of the two connecting pier columns. Place the left and right templates and the top template above the left and right templates on both sides of the pouring platform. The two sides of the left, right, and top templates are respectively attached to the corresponding sides of the joint surface of the two connecting pier columns, with a length of about 20-50cm inside the corresponding sides.

[0037] (4) Pour concrete cement mortar into the concrete pouring space with steel mesh frame formed by the bottom, left and right side templates, top and inner templates and the joint wall of the two connecting piers from each pouring port of the upper template. Vibrate and compact the concrete cement mortar through each pouring port. After the poured concrete cement mortar reaches the demolding strength, remove the left and right side templates, top and inner templates, and cure the concrete poured at the joint of the two connecting piers to reach the set strength. Complete the longitudinal ground joint construction of the joint surface of the connecting piers to form an integral pier.

[0038] (5) Construction of the connection between the lower end of the integral pier and the pier base: A cross mark is affixed 30cm from the top of the integral pier to measure the verticality of the integral pier installation. Two winch cranes are set up on the ground at the rear ends of both sides of the pier base. The hooks of the two winch cranes are fixed to the upper left and right sides of the integral pier. Heavy cranes are set up on the ground at the rear ends of both sides of the pier base. The hooks of the heavy cranes are fixed to the top of the integral pier. The cement surface of the lower end of the integral pier and the pier base is roughened. The two winch cranes and the heavy cranes work together to slowly lift the upper part of the flat integral pier onto the turning platform until the central axis of the integral pier is at an angle of 85° to 90° with the horizontal ground. During the hoisting, a total station is set up on the ground corresponding to the front and side of the integral pier at the designed position. The deviation of the integral pier is adjusted at any time during the hoisting process so that the alignment mark in the middle of the side of the integral pier on the same side is on the same straight line and the midpoint of the cross mark is at the designed midpoint position.

[0039] like Figure 7 and Figure 8 As shown, the lower end face of the integral pier column has several lower ports of the pier wall 57 in the middle. The upper end of each connecting sleeve is connected to the longitudinal steel bar 56 in the corresponding pier column. The upper and lower sides of each connecting sleeve are respectively provided with grouting pipe 51 and overflow pipe 53, which are connected to the outer side of the corresponding pier wall. The upper end face of the pier column base 100 has several exposed connecting steel bars 101 corresponding to the lower ports of each connecting sleeve. When the lower end face of the integral pier column is connected to the pier column base, each exposed connecting steel bar 101 on the upper end face of the pier column base 100 is inserted into the corresponding connecting sleeve on the lower end face of the integral pier column.

[0040] (6) Use a heavy-duty crane to lift the lower end of the vertical integral pier column onto the pier column base. Place a layer of mortar on the pier column base corresponding to the lower end of the integral pier column. Adjust the verticality by using three brackets 59 and three jacks 510 set at the lower end of each side of the integral pier column. The lower end of the jacks 510 is equipped with a force-bearing steel strip 511 for bearing the load. The verticality correction error is 1mm. The brackets are made of welded steel plates with reinforcing ribs on both sides. The brackets are connected to the pier column using a sleeve injection and overflow port. 10.9 grade M20 bolts 58 are used to connect the brackets to the pier column. After the integral pier is installed and finely adjusted, guy ropes are installed around the middle of the integral pier to ensure its stability. Once the mortar layer connecting the lower end of the integral pier to the corresponding pier base reaches the set strength, grouting is then performed inside the sleeve at the bottom of the integral pier. C100 high-strength, non-shrink cement grout is used, and a vertical shaft planetary mixer is used for mixing for 3 minutes. The grout is injected into the sleeve through the lower grouting pipe until grout flows out of the upper overflow pipe. Immediately afterward, the grouting pipe openings and the grouting duct openings connecting to the sleeve are sealed with plugs. Simultaneously, the grout also fills the gap between the bottom and upper piers. The plugs are rubber or wooden plugs, and are truncated cone-shaped.

[0041] When the strength of the poured grout reaches 2.5 MPa, the grout-blocking template (located at the joint between the lower end of the integral pier and the side wall of the pier base) is removed. The plugs are removed, and each pipe opening is sealed with high-strength, non-shrink cement grout. The outer end of the joint is wrapped with a curing tarpaulin to cure the poured grout. Water is periodically sprayed into the hollow column hole at the upper end of the upper pier to cure the grout in the grouting space. The curing period is 14-15 days. The connection between the upper and lower piers is then completed. The corbels are then removed, and grouting and curing are performed on the sleeves occupied by the corbels. The connection and installation of the integral pier and pier base are now complete.

[0042] When the bottom pier connects to the top pier, or the bottom pier connects to the middle pier, or the middle pier connects to the top pier, the center lines of each pier are on the same straight line.

[0043] The connection construction when the bottom pier is connected to the middle pier, and the middle pier is connected to the top pier can be carried out simultaneously or sequentially.

[0044] Example 2: Unlike Example 1, when the bottom pier and the middle pier, and the middle pier and the top pier are connected, a flipping platform, several pier support frames for moving the bottom pier, a pouring platform, several pier support frames for moving the middle pier, a pouring platform, and several pier support frames for moving the top pier are arranged outwards on the ground near the pier base.

[0045] When three piers are connected, the bottom pier and the middle pier, and the middle pier and the top pier, the bottom side of the bottom pier is located on the flipping platform on the ground on one side of the foundation, one side of the bottom pier is located on the bottom pier support frame, the docking surface of the bottom pier is located on the pouring platform near the foundation, one side of the middle pier is located on the middle pier support frame, the docking surface of the middle pier that docks with the bottom pier is located on the other side of the same pouring platform, the two docking surfaces of the middle pier and the top pier are located on the corresponding side of another pouring platform away from the foundation, and one side of the top pier is located on the top pier support frame.

[0046] The rest is the same as in Example 1, so it will not be repeated here.

[0047] The simulation experiment results comparing the method of this invention embodiment with those of traditional methods are as follows: (1) Test method: Thin-walled hollow columns with dimensions of 24cm×11.5cm×9cm and a central porosity of 40% were fabricated using the same materials and preparation method to simulate the connection of two connected thin-walled hollow columns using the traditional method. The upper, middle, and bottom pier structures of this invention, made of the same materials and with the same dimensions, were also fabricated to simulate the connection of two connected thin-walled hollow columns using the method of this invention. A universal testing machine was used for compressive strength testing, with the loading rate controlled within 0.5MPa / s; the flexural strength test was completed using the three-point bending method.

[0048] (2). Simulation experiments show that the flexural strength of the joints of the piers in the embodiment of the present invention is 50% to 55% higher than that of the traditional joints of the piers. This is because the joints of the piers in the embodiment of the present invention use the exposed steel bar head of the two piers to achieve a through connection with the longitudinal steel bar inside the pier, which greatly improves the flexural strength of the joints compared with the traditional method of using a sleeve and the exposed steel bar head to disconnect and insert at the joints of the piers.

[0049] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A segmented hollow thin-walled precast pier column ground longitudinal connection device, comprising a pier column support moving frame, characterized in that: The segmented hollow thin-walled precast pier column ground longitudinal connection device consists of several pier column support moving frames, a turning platform and a pouring platform. It is located on a flat ground on one side of the pier column base that has been completed on site. From the side close to the pier column base outward, there are a turning platform, several pier column support moving frames that support the bottom pier, a pouring platform and several pier column support moving frames that support the top pier. Alternatively, the segmented hollow thin-walled precast pier column ground longitudinal connection device is located on a flat ground on one side of the pier column base that has been completed on site. From the side close to the pier column base outward, there are a flipping platform, several pier column support moving frames that support and move the bottom pier, a pouring platform, several pier column support moving frames that support and move the middle pier, a pouring platform, and several pier column support moving frames that support and move the top pier.

2. The segmented hollow thin-walled precast pier column ground longitudinal connection device according to claim 1, characterized in that: The aforementioned pier support mobile frame is used to support the movement of each precast pier to complete the longitudinal docking on the ground. The pier support mobile frame consists of several support mobile frames distributed longitudinally at intervals. Each support mobile frame is composed of a rectangular steel frame, several rollers and several hydraulic lifting feet. Several rollers are arranged laterally at intervals on the upper end face of the rectangular steel frame. The two sides of each roller are connected to the bearing seats on the corresponding side of the rectangular steel frame through axle rods. Several hydraulic lifting feet are arranged at intervals at the lower end of the rectangular steel frame. The telescopic rods of the hydraulic lifting feet are set downwards, and the lower end of the telescopic rods is provided with force-shaping pads.

3. The segmented hollow thin-walled precast pier column ground longitudinal connection device according to claim 1, characterized in that: The aforementioned tilting platform is used in conjunction with the lifting device to vertically erect the assembled pier column after docking. The upper surface of the base of the tilting platform is provided with a flip plate. The front end of the flip plate is bent upward at a right angle to form a locking edge. The lower part of the front end of the flip plate is connected to the upper part of the front end of the base through a shaft seat and a rod shaft. Several hydraulic lifting feet are provided at intervals around the lower end of the base. The telescopic rods of the hydraulic lifting feet are set downward, and the lower end of the telescopic rods is provided with force-shaping pads.

4. The segmented hollow thin-walled precast pier column ground longitudinal connection device according to claim 1, characterized in that: The aforementioned casting platform is used to support the joint surfaces of each precast pier column to complete the on-site connection. The upper surface of the casting platform is provided with a bottom template, or the upper surface of the casting platform is a flat bottom template. The horizontal sides of the casting platform are provided with clips for the lower sides of the side templates to engage with the columns. The lower perimeter of the casting platform is provided with several hydraulic lifting legs at intervals. The telescopic rods of the hydraulic lifting legs are set downwards, and the lower ends of the telescopic rods are provided with force-sharing pads. The length of the casting platform is greater than the length of the joint surface of each precast pier column, and the width of the casting platform is adapted to the width of the joint bottom surface of each precast pier column. The left and right side templates are clamped on the horizontal sides of the casting platform, and the horizontal sides of the upper template are clamped on the upper ends of the left and right side templates. The longitudinal sides of the inner template are respectively inserted into the hollow holes of the pier columns in the joint surfaces of the two pier columns on the casting platform.

5. The segmented hollow thin-walled precast pier column ground longitudinal connection device according to claim 4, characterized in that: The inner template is a rectangular foam plastic body. The perimeter shape of the inner template is the same as the shape of the hollow hole of the pier column. The longitudinal end faces of the inner template are provided with tie plates. There are tension bars between the two tie plates in the rectangular foam plastic body. There are tie rings in the middle of the outer side of the two tie plates. The longitudinal length of the inner template is greater than the length of the pouring platform.

6. The segmented hollow thin-walled precast pier column ground longitudinal connection device according to claim 1, characterized in that: The longitudinal pier walls of the middle pier and the top pier are provided with corresponding exposed butt rebar ends.

7. A construction method for longitudinally connecting piers on the construction ground using a segmented hollow thin-walled precast pier longitudinal connection device, characterized in that, Includes the following steps: (1) Fabricate several pier support mobile frames, pouring platforms and turning platforms for the longitudinal connection device, and transport them to the construction site; Level the ground on one side of the pier foundation that has been completed. On the leveled ground on one side of the pier foundation, if the bottom pier and the top pier are connected, then from the ground near the pier foundation, there are a turning platform, several pier support moving frames to support and move the bottom pier, a pouring platform, and several pier support moving frames to support and move the top pier. When the bottom pier and the middle pier, and the middle pier and the top pier are connected, a turning platform, several pier support moving frames to support and move the bottom pier, a pouring platform, several pier support moving frames to support and move the middle pier, a pouring platform, and several pier support moving frames to support and move the top pier are arranged outwards on the ground near the pier base. Adjust the hydraulic lifting outriggers at the lower end of each pier support frame to make the upper surfaces of each pier support frame, pouring platform and tilting platform on the same plane. Then, set several support blocks between the lower surface of the support frame, the lower surface of the pouring platform and the lower surface of the tilting platform on the side of each hydraulic lifting outrigger of each pier support frame, pouring platform and tilting platform and the ground. (2) The precast hollow piers that have been precast in the prefabrication yard are transported to the construction site in sequence. The bottom pier is lifted by a crane so that the lower part of the same width side of the bottom pier is placed on a flip plate with a flipping platform near the pier base. The rear end of the side of the bottom pier is against the inner side of the top edge of the flip plate. The lower end of the middle side of the bottom pier is located on the rollers on the pier support moving frame that supports the bottom pier. The lower front side of the bottom pier is located on the longitudinal edge of the bottom template on the opposite side of the pouring platform. The exposed bottom rebar head on the pier wall of the front of the bottom pier is located in the upper space of the pouring platform. The inner template is inserted into the hollow hole of the pier at the front of the bottom pier. The top pier is lifted by a crane so that the lower part of the same width side of the top pier is placed on the rollers of several pier support moving frames that support the top pier on the other side of the pouring platform. The lower front side of the joint surface of the top pier is located on the bottom template edge of the longitudinal side of the pouring platform. The exposed joint steel bar head on the joint surface wall of the front of the top pier is located in the upper space of the pouring platform. The hydraulic lifting outriggers and support blocks at the lower end of each pier support moving frame are readjusted and adjusted again to ensure that the upper surfaces of each pier support moving frame, pouring platform and tilting platform are on the same plane and the center lines of each pier are on the same straight line. The hydraulic lifting outriggers and support blocks bear the weight of each pier support moving frame, pouring platform and tilting platform. When three piers are connected, the bottom pier and the middle pier, and the middle pier and the top pier, the bottom side of the bottom pier is located on the flipping platform on the ground on one side of the foundation, one side of the bottom pier is located on the bottom pier support frame, the docking surface of the bottom pier is located on the pouring platform near the foundation, one side of the middle pier is located on the middle pier support frame, the docking surface of the middle pier that docks with the docking surface of the bottom pier is located on the other side of the same pouring platform, the two docking surfaces of the middle pier and the top pier are located on the corresponding side of another pouring platform away from the foundation, and one side of the top pier is located on the top pier support frame. (3) Use steel bar butt sleeves to connect the corresponding exposed butt steel bar heads on the two butt surfaces of the same casting platform. Tie several horizontal steel bars at intervals on the lower outer side and exposed butt steel bar heads to form a steel bar mesh at the butt surface of the two butt columns. Roughen the butt surface of the two butt columns. Wrap the outer wall of the inner template with release plastic cloth, apply release agent to the inner surfaces of the bottom, left, right and top templates, and pull the inner template into the hollow hole space of the designed pier column on the joint surface of the two docking piers on the same pouring platform. Place the left and right templates and the top template located above the left and right templates on the horizontal sides of the pouring platform. The two sides of the left, right and top templates are respectively attached to the corresponding sides of the joint surface of the two docking piers. (4) Pour concrete cement mortar into the concrete pouring space with steel mesh frame formed by the bottom, left and right side templates, top and inner templates and the joint wall of the two docking columns from each pouring port of the upper template. Vibrate and compact the concrete cement mortar through each pouring port. After the poured concrete cement mortar reaches the demolding strength, remove the left and right side templates, top and inner templates, and cure the concrete poured at the joint of the two docking columns to reach the set strength. Complete the longitudinal ground joint construction of the docking surface of the docking columns to form an integral pier column. (5) Construction of the connection between the lower end of the integral pier and the pier base: A cross mark is pasted 30cm away from the top of the integral pier to measure the verticality of the integral pier installation. Two winch cranes are set up on the ground at the rear ends of the pier base. The hooks of the two winch cranes are fixed to the upper left and right sides of the integral pier. Heavy cranes are set up on the ground at the rear ends of the pier base. The hooks of the heavy cranes are fixed to the top of the integral pier. The cement surface of the lower end of the integral pier and the pier base is roughened. The two winch cranes and the heavy cranes work together to slowly lift the upper part of the flat integral pier onto the turning platform until the central axis of the integral pier is at an angle of 85° to 90° with the horizontal ground. During the hoisting, a total station is set up on the ground corresponding to the front and side of the integral pier at the designed position. The deviation of the integral pier is adjusted at any time during the hoisting process so that the alignment mark in the middle of the side of the integral pier on the same side is on the same straight line and the midpoint of the cross mark is at the designed midpoint position. (6) Use a heavy-duty crane to lift the lower end of the vertical integral pier column onto the pier base. Place a layer of mortar on the pier base corresponding to the lower end of the integral pier column. Adjust the verticality using three brackets and three jacks at the lower end of each side of the integral pier column. The verticality correction error is 1mm. The brackets are made of welded steel plates with reinforcing ribs on both sides. The brackets are connected to the pier column using a sleeve injection and overflow port, using 10.9 grade M20 bolts. After the integral pier column is finely adjusted, set up guy ropes around it to ensure the stability of the pier column. Then, grout is injected into the sleeve at the bottom of the integral pier column. The grouting material is C100 high-strength non-shrink cement grouting material. Grouting can only be carried out after the foundation mortar has reached its final set. The grout is injected from the lower grouting hole until grout flows out from the upper grout outlet. Seal the inlet and outlet ports to complete the connection and installation of the integral pier column and the pier base.

8. The method according to claim 7, characterized in that: When the bottom pier is connected to the top pier, or the bottom pier is connected to the middle pier, or the middle pier is connected to the top pier, the center lines of each pier are on the same straight line.

9. The method according to claim 7, characterized in that: The inner template is pulled to the hollow hole space of the pier column on the same casting platform. The inner template is first placed in the hollow hole of the pier column on one side of the docking surface of the docking pier column. The pull rings in the middle of the two outer sides of the inner template are respectively connected to one end of the respective pull rope, and the other end of each pull rope passes through the center hole of the corresponding pier column.

10. The method according to claim 7, characterized in that: The connection construction when the bottom pier and the middle pier, and the middle pier and the top pier are connected can be carried out simultaneously or sequentially.

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