Passing pier and beam continuous construction bridging system and method suitable for three-dimensional overlapped elevated frame

Abstract

The invention provides a traffic-guaranteeing pier-beam continuous construction bridging system and a traffic-guaranteeing pier-beam continuous construction bridging method suitable for a three-dimensional overlapped elevated frame, the traffic-guaranteeing pier-beam continuous construction bridging system comprises at least two main beams, the main beams are supported at the top of a box beam, a cover beam or a pier body through legs, a supporting cross beam is arranged between the legs and the pier body, and the supporting cross beam stretches across the tops of a plurality of pier bodies; at least one crown block is arranged at the top of the main beam, and the crown block is provided with a hoisting trolley capable of moving transversely and used for hoisting and installing a cover beam and a box beam; a rotating crane is further arranged at the top of the main beam and used for being matched with a crown block to hoist the prefabricated pier body from the bridge floor. By the adoption of the structure, under the constraint that the legs do not fall to the ground, bridging construction of multiple components can be achieved, namely hoisting construction of pier bodies, cover beams and small box girders is completed, and the device is suitable for the construction working conditions of three-dimensional overlapped elevated frames and spanning existing roads.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction equipment, and in particular to a bridge erection system and method for continuous construction of traffic-guaranteed piers and beams suitable for three-dimensional superimposed elevated bridges. Background Art

[0002] When a bridge crosses an existing road, it often requires the installation of portal piers. Traditionally, these piers are primarily cast-in-place prestressed reinforced concrete. However, due to the potential impact of the pier's location, water and electricity pipelines, telecommunications cables, and other structures on the intersecting roads, construction conditions are limited. Therefore, rapid construction of the portal pier cap beams posed a technical challenge for this project. The project's route involves numerous urban schools and residential areas, and the route crosses ecologically sensitive areas such as rivers, wetland parks, and greenways. The route is complex with above- and underground pipelines, and land resources on both sides are extremely limited. The new bridge is expected to have a 3.5-kilometer section co-linear with the highway, with a 100% overlap ratio of projected lanes. The new bridge will span approximately 500 meters of the existing highway, and some sections will feature large, fully enclosed steel truss sound barriers. The construction difficulty and complex traffic management are among the highest among similar projects nationwide. Currently, there are no similar projects to draw upon. This involves a complex, three-dimensional expansion and renovation of a busy, heavily trafficked urban highway, posing significant construction challenges. Chinese patent document CN116427281A records a method for installing a pier, cap beam, and T-beam integrated bridge-erecting machine. It describes a scheme for using a bridge-erecting machine to install piers, cap beams, and T-beams. However, the bridge-erecting machine has at least one leg that falls on the ground. In this project, due to the influence of the intersecting roads in the three-dimensional superimposed elevated structure, the bridge-erecting machine does not have the construction conditions for the legs to fall to the ground. CN110093862A records a three-working-surface bridge-erecting machine and a method for assembling cap beams in sections without a temporary road that can be assembled in both longitudinal and transverse directions. This technical difficulty also exists. The solution adopted in this document is to have the front legs fall on the pedestal at the bottom of the pier, which increases the projected area of the pedestal. In addition, due to the influence of the superimposed elevated structure, the leg height is relatively high, so legs with larger cross-sections need to be used, which increases the deadweight. This document uses a transversely spliced prestressed segmented cap beam structure, which is difficult to construct and has weak structural stability. Existing pier body construction usually requires the installation of a formwork system around the pier body, such as a climbing formwork, flip formwork, or sliding formwork system. These structures require a large ground space and a protective range, which has a significant impact on traffic. In addition, the pier body is usually cast in sections from top to bottom, which takes a long time to wait for the concrete to set, resulting in low construction efficiency and extended road occupancy time. There are also solutions for prefabricated pier bodies for installation in the prior art, such as CN111379218A prefabricated pier body and prefabricated pier body installation method. Due to the weight of the pier body, this solution adopts a solution for assembling segmented prefabricated pier bodies, which also leads to low construction efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bridge-building system and method for continuous construction of piers and beams suitable for three-dimensional superimposed elevated roads. The bridge-building construction can be carried out without occupying the road, and the legs of the bridge-building machine do not need to be supported on the ground, reducing the support risk of the legs with large heights. The bridge-building system of the present invention can complete the transportation of pier bodies, cap beams and box beam components from the bridge deck, greatly reducing the occupation of existing roads. In the preferred solution, the structure and operation difficulty of the bridge-building system can be simplified, especially the difficulty of switching legs during the transportation of the cap beam can be reduced. The hoisting weight of the pier body can be reduced, and the construction efficiency of the pier body can be greatly improved. The pier body does not occupy road space during the formwork process, and the construction process of the pier body can be completed by only one casting.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a continuous pier-beam construction bridge system suitable for three-dimensional superimposed elevated traffic protection, comprising at least two main beams, the main beams being supported on the box beam, cap beam, or pier body top by legs, and a supporting crossbeam being provided between the legs and the pier body, the supporting crossbeam spanning the tops of multiple pier bodies; A crane is provided on the top of the main beam, and the crane is provided with a horizontally movable lifting trolley for lifting and installing the cap beam and box beam; There is also a rotating crane on the top of the main beam, which is used to cooperate with the overhead crane to lift the prefabricated pier from the bridge deck; The cap beam is divided into two pieces along the longitudinal direction. The two cap beams are hoisted separately and fixedly connected to each other at the top of the pier body.

[0005] In the preferred solution, the structure of the rotating crane is as follows: the crane body is slidably arranged on the main beam, and a space open on one side for accommodating the prefabricated pier body is provided in the middle of the crane body, and pulley blocks driven by a driving device are provided on both sides of the space, and the movable pulley block of the pulley block is connected to the rotating shaft, and the rotating shaft is connected to the clamp, and the clamp is used to connect with the prefabricated pier body.

[0006] The axis of the rotating shaft is close to the vertical line passing through the prefabricated pier body and the center of mass of the hoop.

[0007] In a preferred solution, the prefabricated pier body is a non-dismantling formwork of the pier body or a non-dismantling formwork with a steel cage inside.

[0008] In a preferred embodiment, the main beams are two, and along the main beams, rear support legs, middle support legs, front middle support legs, and front support legs are sequentially provided; the rear support legs, middle support legs, front middle support legs, and front support legs can move relative to the main beam, and the moving direction is the length direction of the main beam; The rear outriggers and the front middle outriggers are provided with lifting hydraulic cylinders and guide mechanisms to realize the lifting of the outriggers, so that the front middle outriggers are supported on the top of the cap beam or on the top of the pier body through the supporting crossbeam. The middle support leg, the front middle support leg, and the front support leg fall on the transverse track. A wheel box is provided at the bottom of the middle support leg and the front middle support leg for moving along the transverse track. During the movement, the rear support leg and the front support leg are in a raised state. The first and second car are installed on the main beam, and a rotating hoist is provided below the first and second car. The rotating hoist is used to rotate the cap beam transported along the surface of the box beam horizontally 90° in the air so as to be installed on the top of the pier body.

[0009] In a preferred embodiment, the rotating sling has a connecting beam for connecting with the cap beam, a hinge seat is provided in the middle of the connecting beam, the hinge seat is hinged to the bottom of the shaft, the shaft is rotatably connected to the sling beam, and the sling beam is connected to the first car and the second car; The hinge seat is slidably connected to the connecting beam, and a positioning cylinder is provided between the hinge seat and the connecting beam to adjust the balance of the connecting beam.

[0010] In a preferred embodiment, the main beams are two, and along the main beams, rear support legs, middle support legs, front middle support legs, and front support legs are sequentially provided; the rear support legs, middle support legs, front middle support legs, and front support legs can move relative to the main beam, and the moving direction is the length direction of the main beam; The rear outrigger, front middle outrigger, and front outrigger are provided with lifting hydraulic cylinders and guide mechanisms to realize the lifting of the outriggers, so that the front middle outriggers are respectively supported on the top of the cap beam or on the top of the pier body through the supporting crossbeam; The middle support leg, the front middle support leg, and the front support leg fall on the transverse track. A wheel box is provided at the bottom of the middle support leg and the front middle support leg for moving along the transverse track. During the movement, the rear support leg and the front support leg are in a raised state. There is also a beam transport trolley for transporting the cap beam. The top of the beam transport trolley is equipped with a turntable, which can realize horizontal rotation of 90° on the surface of the box beam through the cooperation of the overhead crane.

[0011] In a preferred solution, a sliding seat is provided at the bottom of the beam body supporting the cross beam, and the number of the sliding seats is consistent with the number of the corresponding pier bodies. The top of the sliding seat is connected to the grooves on both sides of the beam body through a hanging wheel. There is a gap between the hanging wheel and the groove. When the beam is dropped, the beam body falls on the top of the sliding seat. A plurality of extension seats are provided at the bottom of the sliding seat, and the extension seats avoid the steel bars. A plunger is provided at the bottom of the extension seat, and the plunger is movably provided in the vertical cylinder body; A communicating port is provided between the cylinder bodies of each plunger, and a liquid inlet is provided on one of the cylinder bodies.

[0012] A construction method for the above-mentioned continuous construction bridge erection system for ensuring traffic flow through piers and beams applicable to a three-dimensional superimposed elevated highway comprises the following steps: S01. Move the two overhead cranes to the tail of the main beam, so that the main beam moves forward to the top of the N+1 pier, and the front legs and the front middle legs are retracted. The front legs and the supporting beams pass over the N+1 pier, and are suspended in the air. The front middle legs and the supporting beams are moved to the top front side support of the N+1 pier; Make the main beam move forward to the top of the N+2 pier; S02. The transport vehicle transports the prefabricated pier body along the bridge deck to the bridge head. The second vehicle and the rotary crane transport the prefabricated pier body to the position of the N+2 pier body by lifting. The second vehicle cooperates with the rotary crane to lower the prefabricated pier body so that it is vertically installed at the preset position. Subsequently, concrete is poured to form the pier body. S03, the front outrigger and the supporting beam are moved to the N+2 pier, the top front side support, the front middle outrigger and the supporting beam are moved to the N+2 pier, and are suspended nearby; S04: The beam transporter transports the first cap beam along the bridge deck to the rotating hoist. The first and second carriages lift the first cap beam to the top of the N+1 pier, rotate it horizontally 90°, and install it on the top rear side of the N+1 pier. Hoist the second cap beam to the rear side of the top of the N+1 pier and connect the second cap beam to the first cap beam to form a whole; S05: The beam transporter transports the box beam along the bridge deck to the bridge head. The first and second stage vehicles hoist the box beam onto the cap beam between piers N and N+1, and move the entire main beam horizontally, so that multiple box beams are laid out along the transverse direction of the bridge. S06, the middle leg moves to the front side of the top of the N+1 pier and lands on the second cap beam; The front outrigger and the front middle outrigger are retracted, the front outrigger and the supporting beam pass over the N+2 pier and are suspended in the air, the front middle outrigger and the supporting beam are moved to the N+2 pier and supported on the top front side; Repeat the above steps to realize the continuous construction of piers and beams of the three-dimensional superimposed elevated road to ensure traffic without touching the ground.

[0013] A construction method for the above-mentioned continuous construction bridge erection system for ensuring traffic flow through piers and beams applicable to a three-dimensional superimposed elevated highway comprises the following steps: S11. Move the two overhead cranes to the tail of the main beam, so that the main beam moves forward to the top, front legs, and supporting beams of the N+1 pier, passes over the top, front middle legs, and supporting beams of the N+1 pier, and moves to the top front side support of the N+1 pier; S12. The transport vehicle transports the prefabricated pier body to the bridge head along the bridge deck. The second vehicle and the rotary crane transport the prefabricated pier body to the position of the N+2 pier body by lifting. The second vehicle lowers the prefabricated pier body to install it vertically at the preset position. Subsequently, concrete is poured to form the pier body. S13, move the overhead crane to the tail of the main beam, so that the main beam moves forward to the top of the N+2 pier; The front outrigger and supporting beam are moved to the N+2 pier body and supported on the top front side; S14. Two beam transport trolleys transport the first cap beam to the bridge head along the bridge deck by lifting. The middle support leg is retracted to a position close to the rear support leg to avoid the rotation range of the first cap beam. The overhead crane is connected to the first lifting point of the first cap beam, and the other end of the first cap beam is located on a beam transport trolley. The main beam moves horizontally in coordination with the overhead crane moving along the bridge direction and the beam transport trolley, and assists the first cap beam to rotate 90 degrees horizontally on the bridge deck; The first cap beam first falls on the two beam transport trolleys located at the bridge head, waiting to be hoisted; The bridge head position refers to the end position of the bridge deck after the box girder is laid; S15, the overhead crane is connected to the first cap beam, and the first cap beam is hoisted to the top rear side of the N+1 pier; S16. According to step S14, the second cap beam is rotated 90 degrees horizontally on the bridge deck and placed on the two beam transport trolleys located at the bridge head, waiting for hoisting; S17, the middle leg, moves forward to the bridge head position for support, and the front middle leg and the supporting beam move over the N+1 pier, with the top hanging in the air; S18. Hoist the second cap beam to the front of the top of the N+1 pier and connect the second cap beam to the first cap beam to form a whole. S19. Two beam transport trolleys transport the box beams along the bridge deck to the bridgehead. The first and second trolleys hoist the box beams onto the cap beam between piers N and N+1. The bridge erection system is moved transversely, allowing multiple box beams to be laid out along the transverse direction of the bridge. Repeat the above steps to realize the continuous construction of piers and beams of the three-dimensional superimposed elevated road to ensure traffic without touching the ground.

[0014] In the preferred solution, in step S14, the first cap beam is longitudinally transported to the bridge head, the overhead crane moves to the top middle of the first cap beam, and is hoisted and connected to the first lifting point near the middle of the first cap beam, and the first lifting point is lifted so that one end of the first cap beam is separated from the corresponding beam transport trolley, and the other end of the first cap beam falls on the top of the remaining beam transport trolley. The beam transport trolley and the overhead crane jointly lift part of the first cap beam to the outside of the bridge head. At this time, the beam transport trolley is located at the bridge head, the main beam moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam, and the overhead crane retreats to the bridge head position, and the first cap beam rotated 90° is hoisted back onto the two beam transport trolleys to realize the operation of rotating the first cap beam 90° horizontally on the bridge deck.

[0015] In the preferred solution, before the supporting beam falls on the top of the pier, the position of the sliding seat is moved so that the extension seat avoids the end of the steel bar and the plunger falls on the top of the pier; Hydraulic oil is injected into the liquid inlet to extend the plunger to contact the top of the pier body. The pressure of the hydraulic oil is balanced among the cylinders, and the pressure on the supporting beam is evenly distributed to each plunger to compensate for the flatness error of the top of the pier body.

[0016] The present invention provides a bridge-building system and method for continuous construction of piers and beams suitable for three-dimensional superimposed elevated roads. By adopting the above structure, it is possible to realize the construction of multi-component bridges under the constraint that the legs do not touch the ground, that is, to complete the hoisting construction of the pier body, cap beam and small box beam, which is suitable for the construction conditions of three-dimensional superimposed elevated roads and crossing existing roads. By adopting the scheme of installing the cap beam in pieces, the weight of the cap beam of a large-width bridge is greatly reduced, the single lifting weight of the bridge-building system is reduced, and the deadweight of the bridge-building system is reduced. The provided supporting crossbeam can conveniently provide reliable aerial support for the bridge-building system, and the provided balanced force plunger structure can effectively ensure that each plunger is evenly stressed, thereby providing reliable support. The use of the pier body shell formwork construction method can reduce the hoisting weight of the pier body and greatly improve the construction efficiency of the pier body. The pier body does not occupy road space during the formwork erection process, and the pier body construction process only requires one casting. In some preferred schemes, the use of a rotating sling construction method can conveniently realize the aerial rotation of the cap beam. In another preferred solution, the bridge deck rotation construction method adopted can be applied to cap beams with larger deadweight, for example, bridges with larger span widths, to reduce safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples: Figure 1 It is a front view of the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of the position of the front legs of the present invention.

[0019] Figure 3 It is a cross-sectional schematic diagram of the front middle support leg of the present invention supported at the supporting beam position.

[0020] Figure 4 It is a cross-sectional schematic diagram of the front middle support leg of the present invention supported at the cap beam position.

[0021] Figure 5 It is a schematic cross-sectional view of the support leg positions in the present invention.

[0022] Figure 6 It is a schematic cross-sectional view of the rear support leg position of the present invention.

[0023] Figure 7 This is the main view of the present invention when the cap beam is hoisted using a rotating hoist.

[0024] Figure 8 It is a top view of the present invention when a rotary hanger is used to lift the cap beam.

[0025] Figure 9 It is a construction schematic diagram of the present invention when the bridge deck is rotated to lift the cap beam.

[0026] Figure 10 It is a construction schematic diagram of the present invention when the bridge deck is rotated to lift the cap beam.

[0027] Figure 11 It is a construction schematic diagram of the cap beam of the present invention when the bridge deck rotates.

[0028] Figure 12 It is a front view of the support beam of the present invention.

[0029] Figure 13 It is a side view of the support beam of the present invention.

[0030] Figure 14 It is a structural schematic diagram of the plunger array of the present invention.

[0031] Figure 15 It is an elevation view of the rotary crane of the present invention.

[0032] Figure 16 It is a top view of the rotating crane of the present invention.

[0033] Figure 17 It is a schematic diagram of the overall hoisting structure of the rotary crane of the present invention.

[0034] In the figure, box girder, 1, pier body, 2, rear support leg, 3, first car, 4, transverse traction device, 401, lifting trolley, 402, pulley block, 403, longitudinal moving device, 404, second car, 5, main beam, 6, middle support leg, 7, transverse track, 8, supporting beam, 9, beam body, 91, hanging wheel, 92, sliding seat, 93, extension seat, 94, plunger, 95, steel bar, 96, cylinder body, 97, liquid inlet, 98, connecting port, 99, front middle support leg, 10, front support leg, 11, connecting rod, 12, transverse wheel box , 13,, Front middle support leg, 14,, Cap beam, 15,, First cap beam, 151,, Second cap beam, 152,, Middle support leg, 16,, Box beam, 17,, Rear support leg, 18,, Rotating sling, 19,, Connecting beam, 191,, Positioning cylinder, 192,, Hinge seat, 193,, Lifting beam, 194,, Beam transport trolley, 20,, Rotating crane, 21,, Crane body, 211,, Rotating shaft, 212,, Driving device, 213,, Transmission device, 214,, Pulley block, 215,, Hoop, 216,, Third overhead crane, 22,, Beam transport trolley, 23,, Precast pier body, 24,. DETAILED DESCRIPTION

[0035] Example 1: like Figure 1 、 10 As shown in 15 to 17, a continuous pier-beam construction bridge system suitable for three-dimensional superimposed elevated traffic protection includes at least two main beams 6, which are supported on the box beam 17, the cap beam 15, or the top of the pier body 2 through legs, and a supporting crossbeam 9 is provided between the legs and the pier body 2, and the supporting crossbeam 9 spans across the tops of multiple pier bodies 2; A crane is provided on the top of the main beam 6, and the crane is provided with a transversely movable lifting trolley 402, for lifting and installing the cap beam 15 and the box beam 17; A rotating crane 21 is also installed on top of the main beam 6, which cooperates with the overhead crane to lift the prefabricated piers 24 from the bridge deck. This construction scheme, in which the legs do not touch the ground, allows for the erection of multiple components within the constraints of the legs not touching the ground. This includes the lifting and construction of the prefabricated piers 24, cap beams, and small box beams, resolving the challenges of large interference and long road closures caused by the construction of a three-dimensional superimposed elevated road and crossing over existing roads. The advantage of this construction scheme is that it avoids interference with the road surface of the three-dimensional superimposed elevated road. Specifically, during construction of the upper elevated road, the legs may need to fall onto the road surface of the lower elevated road, which may have insufficient bearing capacity and require additional supports. Alternatively, it avoids the problem of legs being too high, for example, exceeding 10 meters, which would result in insufficient lateral force and significantly increased safety risks.

[0036] The box beam 17 in this example is a small box beam. Figure 5 、 6 As shown in FIG, a plurality of box beams 17 are arranged along the cap beam.

[0037] The cap beam 15 is divided into two pieces along the longitudinal direction. The two cap beams 15 are hoisted separately, and the two cap beams 15 are fixedly connected to each other at the top of the pier body 2. With this structure, the weight of a single hoisting can be greatly reduced. Taking a certain project as an example, the weight of the entire cap beam is about 500t. Combined with the weight of the hoisting equipment and the weight of the bridge erection system, the bridge deck hoisting construction is difficult. The pier body and box beam have insufficient supporting capacity. After adopting the two-piece cap beam structure, the weight of a single cap beam is only 250t, which greatly reduces the difficulty of hoisting.

[0038] The preferred solution is Figures 15-17 In the embodiment, the structure of the rotating crane 21 is as follows: the crane body 211 is slidably arranged on the main beam 6, and a space open on one side for accommodating the prefabricated pier body 24 is provided in the middle of the crane body 211, and pulley blocks 215 driven by a driving device 213 are provided on both sides of the space, the movable pulley block of the pulley block 215 is connected to the rotating shaft 212, the rotating shaft 212 is connected to the clamp 216, and the clamp 216 is used to connect with the prefabricated pier body 24.

[0039] The axis of the rotating shaft, 212, is located near a vertical line passing through the center of mass of the precast pier body, 24, and the hoop, 216.

[0040] In a preferred embodiment, the prefabricated pier body 24 is a non-removable formwork for the pier body or a non-removable formwork with a reinforcing cage inside. When the pier body is short and light, the reinforcing cage is placed inside the non-removable formwork for the pier body. When the pier body is long and large, the non-removable formwork and the reinforcing cage are hoisted separately.

[0041] Example 2: The preferred solution is Figure 7 、 8 As shown in, the main beams 6 are two, and along the main beam 6, rear support legs 3, middle support legs 7, front middle support legs 10 and front support legs 11 are provided in sequence; the rear support legs 3, middle support legs 7, front middle support legs 10 and front support legs 11 can move relative to the main beam 6, and the moving direction is the length direction of the main beam 6; like Figures 2-4 As shown in , 6, the rear support leg, 3, and the front middle support leg, 10, and the front support leg, 11, are provided with a lifting hydraulic cylinder and a guide mechanism to realize the lifting of the support legs, so that the front middle support leg, 10, is supported on the top of the cap beam, 15, or supported on the top of the pier body, 2, through the supporting cross beam, 9; the specific structure of the lifting hydraulic cylinder and the guide mechanism is the existing technology.

[0042] like Figures 2 to 5 As shown in the figure, the middle leg, 7, the front middle leg, 10, and the front leg, 11 fall on the transverse track, 8, and a wheel box is provided at the bottom of the middle leg, 7 and the front middle leg, 10, for moving along the transverse track, 8. During the movement, the rear leg, 3, and the front leg, 11 are in a raised state; the specific structure of the wheel box is the existing technology.

[0043] A first car 4 and a second car 5 are provided on the main beam 6, and a rotating hoist 19 is provided below the first car 4 and the second car 5. The rotating hoist 19 is used to horizontally rotate the cap beam 15 transported along the surface of the box beam 17 by 90° in the air so as to be installed on the top of the pier body 2.

[0044] The preferred solution is Figure 7 In the rotating sling, 19, the connecting beam, 191, is used to connect with the cap beam, 15. A hinge seat, 193, is provided in the middle position of the connecting beam, 191. The hinge seat, 193, is hinged to the bottom of the shaft. The shaft is rotatably connected to the hanging beam, 194. The hanging beam, 194, is connected to the first car, 4, and the second car, 5. Those skilled in the art should know that there are many ways to rotatably connect the shaft and the hanging beam 194. For example, the shaft passes through the end of the hanging beam 194 and is connected to the disc structure through a flange structure. A thrust bearing is provided between the disc structure and the hanging beam 194. Preferably, a thrust joint bearing is used to achieve a rotatable connection under load-bearing conditions. An optional solution is to control the rotation of the shaft during the rotation process by means of a guy rope, thereby controlling the rotation of the cap beam. There are at least two guy ropes, one end of which is provided at the bridge head, and the other end is connected to the end of the cap beam. The guy rope is controlled by a winch device at the bridge head, thereby controlling the rotation of the cap beam. In another alternative, teeth are provided on the outer edge of the disk structure, and a motor and a reduction mechanism are provided on the lifting beam 194 to control the rotation of the control shaft and the cap beam. Additional guy ropes are also required to ensure safety during the lifting of the cap beam.

[0045] like Figure 7 In the middle, hinge seat 193 is slidably connected to connecting beam 191. A positioning cylinder 192 is provided between hinge seat 193 and connecting beam 191 to adjust the balance of connecting beam 191. The extension and retraction of positioning cylinder 192 controls the position of hinge seat 193 on connecting beam 191, thereby controlling the balance of connecting beam 191 and its underlying cover beam.

[0046] Example 3: like Figure 7 、 8 A construction method for the above-mentioned continuous construction bridge erection system of piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway comprises the following steps: S01. Move the two overhead cranes to the tail of the main beam 6, so that the main beam 6 moves forward to the top of the N+1 pier 2. The front support leg 11 and the front middle support leg 14 are retracted. The front support leg 11 and the supporting beam 9 pass over the N+1 pier 2 and are suspended in the air. The front middle support leg 14 and the supporting beam 9 move to the top front side support of the N+1 pier 2. In this case, the front refers to Figure 7 、 8 Right side refers to the left side. All subsequent front and back relationships shall be based on this.

[0047] Make the main beam, 6, advance to the top of the N+2 pier, 2; S02, the transport vehicle transports the prefabricated pier body 24 along the bridge deck to the bridge head. The next day, the transport vehicle 5 and the rotary crane 21 transport the prefabricated pier body 24 to the position of the N+2 pier body 2 by lifting. The next day, the transport vehicle 5 cooperates with the rotary crane 21 to lower the prefabricated pier body 24 to the preset position. Subsequently, concrete is poured to form the pier body 2. S03, the front support leg, 11, and the supporting beam, 9, are moved to the top front side support of the N+2 pier, 2, and the front middle support leg, 14, and the supporting beam, 9, are moved to the N+2 pier, 2, and are suspended in the air; the transport vehicle refers to a conveying device with multiple wheel sets.

[0048] S04, the beam transporter 23, transports the first cap beam 151 along the bridge deck to the bottom of the rotating hoist 19, the first car 4 and the second car 5 lift the first cap beam 151 to the top of the N+1 pier 2, rotate it horizontally 90 degrees, and hoist the first cap beam 151 to the rear side of the top of the N+1 pier 2; The second cap beam 152 is hoisted on the top rear side of the N+1 pier body 2, and the second cap beam 152 is connected to the first cap beam 151 as a whole; preferably, the second cap beam 152 is fixedly connected to the first cap beam 151 by welding construction.

[0049] S05, the beam transporter transports the box beam 17 along the bridge deck to the bridge head. The first car 4 and the second car 5 hoist the box beam 17 onto the cap beam between pier N 2 and pier N+1 2, and move the entire main beam 6 transversely, so that multiple box beams 17 are arranged along the transverse direction of the bridge. The bridge head position refers to the end position after the box girder 17 is laid on the bridge deck.

[0050] S06, the middle leg, 7, moves to the front side of the top of the N+1 pier, 2, and lands on the second cap beam, 152; The front supporting leg 11 and the front middle supporting leg 14 are retracted, the front supporting leg 11 and the supporting beam 9 pass over the N+2 pier 2 and are suspended in the air, the front middle supporting leg 14 and the supporting beam 9 are moved to the top front side support of the N+2 pier 2; Repeat the above steps to realize the continuous construction of piers and beams of the three-dimensional superimposed elevated road to ensure traffic without touching the ground.

[0051] Example 4: The preferred solution is Figures 9-11 In the embodiment, the main beams 6 are two, and along the main beam 6, rear supporting legs 3, middle supporting legs 7, front middle supporting legs 10 and front supporting legs 11 are provided in sequence; the rear supporting legs 3, middle supporting legs 7, front middle supporting legs 10 and front supporting legs 11 can move relative to the main beam 6, and the moving direction is the length direction of the main beam 6; The rear support leg, 3, the front middle support leg, 10, and the front support leg, 11, are provided with a lifting hydraulic cylinder and a guide mechanism to realize the lifting and lowering of the support legs, so that the front middle support leg, 10, is respectively supported on the top of the cap beam, 15, or supported on the top of the pier body, 2, through the supporting cross beam, 9; The middle support leg 7, the front middle support leg 10, and the front support leg 11 fall on the transverse track 8. Wheel boxes are provided at the bottom of the middle support leg 7 and the front middle support leg 10 for moving along the transverse track 8. During the movement, the rear support leg 3 and the front support leg 11 are in a raised state. like Figure 10 In the box girder, there is also a beam transport trolley 20 for transporting the cap beam 15. The top of the beam transport trolley 20 is provided with a turntable, which can realize horizontal rotation of 90° on the surface of the box girder 17 through the cooperation of the overhead crane.

[0052] The beam transport trolley 20 referred to in this example is a beam transport trolley equipped with multiple wheel sets at the bottom and a turntable at the top. The turntable is used to assist in the rotation of the cap beam. Typically, at least two beam transport trolleys 20 are used in a group. The bottom of the turntable is connected to the top of the beam transport trolley body via a thrust bearing. The thrust bearing is preferably a thrust spherical plain bearing.

[0053] Example 5: like Figures 9-11 A construction method for the above-mentioned continuous construction bridge erection system of piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway comprises the following steps: S11. Move the two overhead cranes to the tail of the main beam 6, so that the main beam 6 moves forward to the top of the N+1 pier 2, and the front support leg 11 and the supporting beam 9 pass over the top of the N+1 pier 2, the front middle support leg 10 and the supporting beam 9 and move to the top front side support of the N+1 pier 2; S12, the transport vehicle transports the prefabricated pier body 24 along the bridge deck to the bridge head. The next day, the transport vehicle 5 and the rotary crane 21 transport the prefabricated pier body 24 to the position of the N+2 pier body 2 by lifting. The next day, the transport vehicle 5 lowers the prefabricated pier body 24 to be installed vertically at the preset position. Subsequently, concrete is poured to form the pier body 2. S13, move the overhead crane to the tail of the main beam, 6, and make the main beam, 6, advance to the top of the N+2 pier, 2,; The front outrigger, 11, and the supporting beam, 9, are moved to the N+2 pier, 2, the top front side support; S14. Two beam transporting trolleys 20 transport the first cap beam 151 to the bridge head along the bridge deck by lifting. The middle support leg 16 retreats to a position close to the rear support leg 18 to avoid the rotation range of the first cap beam 151. The overhead crane is connected to the first lifting point of the first cap beam 151, and the other end of the first cap beam 151 is located on a beam transport trolley 20. The main beam 6 moves laterally to cooperate with the overhead crane to move along the bridge and the beam transport trolley 20 to move, so as to assist the first cap beam 151 to rotate 90 degrees horizontally on the bridge deck; Specifically, the first cap beam 151 is transported longitudinally to the bridge head, the overhead crane moves to the top middle portion of the first cap beam 151, and is hoisted and connected to the first hoisting point near the middle portion of the first cap beam 151, and the first hoisting point is lifted so that one end of the first cap beam 151 is separated from the corresponding beam transport trolley 20, and the other end of the first cap beam 151 falls on the top of the remaining beam transport trolley 20, and the beam transport trolley 20 and the overhead crane jointly lift part of the first cap beam 151 to the outside of the bridge head. At this time, the beam transport trolley 20 is located at the bridge head, the main beam 6 moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam 151, and the overhead crane retreats to the bridge head position, and hoists the first cap beam 151, which has been rotated 90°, back onto the two beam transport trolleys 20, to realize the operation of rotating the first cap beam 151 90° horizontally on the bridge deck.

[0054] The first cap beam, 151, first lands on the two beam transport trolleys, 20, located at the bridge head, waiting to be hoisted; The bridge head position refers to the end position of the bridge deck after the box girder,17,is laid; S15, the overhead crane is connected to the first cap beam, 151, and the first cap beam, 151, is hoisted to the rear side of the top of the N+1 pier, 2; S16. According to step S14, the second cap beam 152 is rotated 90 degrees horizontally on the bridge deck and placed on the two beam transport trolleys 20 located at the bridge head, waiting for hoisting; S17, the middle leg, 16, moves forward to the bridge head position for support, the front middle leg, 10, and the supporting beam, 9, move over the N+1 pier, 2, with the top hanging in the air; S18, hoist the second cap beam 152 to the front side of the top of the N+1 pier 2, and connect the second cap beam 152 to the first cap beam 151 to form a whole; S19, two beam transport trolleys, 20, transport the box girder, 17, along the bridge deck to the bridge head. The first trolley, 4, and the second trolley, 5, hoist the box girder, 17, onto the cap beam between pier N, 2, and pier N+1, 2, and move the bridge erection system transversely, so that multiple box girders, 17, are laid out along the transverse direction of the bridge. Repeating the above steps allows for continuous construction of piers and beams on a three-dimensional composite elevated structure, ensuring accessibility without touching the ground. This method utilizes a rotating bridge deck, reducing the risk of rotating the hoist in mid-air and increasing the load capacity. It is suitable for lifting very long cap beams, such as those greater than a span.

[0055] Example 6: The preferred solution is Figures 12-14 In the embodiment, a sliding seat 93 is provided at the bottom of the beam body 91 supporting the cross beam 9, and the sliding seat 93 is consistent with the number of the corresponding pier body 2. The beam body 91 is welded with two I-beams. Grooves are provided on both sides of the beam body 91. The top of the sliding seat 93 is connected to the grooves on both sides of the beam body 91 through a hanging wheel 92. There is a gap between the hanging wheel 92 and the groove. When the beam is dropped, the beam body 91 falls on the top of the sliding seat 93, and the gap disappears. The sliding seat 93 cannot slide relative to each other due to friction, thus forming a pier structure. A plurality of extension seats 94 are provided at the bottom of the sliding seat 93, with gaps between the extension seats 94 so that the extension seats 94 avoid the steel bars 96. The steel bars 96 are reserved steel bars at the top of the pier body 2 for connection with the cap beam. A plunger 95 is provided at the bottom of the extension seat 94. The plunger 95 is sealed and movably disposed in a vertical cylinder 97. A communication port 99 is provided between the cylinder bodies 97 of each plunger 95, and a liquid inlet 98 is provided on one of the cylinder bodies 97.

[0056] Example 7: The preferred solution is Figures 12-14 In the middle, before the supporting beam 9 falls on the top of the pier body 2, the position of the sliding seat 93 is moved so that the extension seat 94 avoids the end of the steel bar 96, and the plunger 95 falls on the top of the pier body 2; Hydraulic oil is injected into the liquid inlet 98, causing the plunger 95 to extend and contact the top of the pier shaft 2. The pressure of the hydraulic oil is balanced between the cylinders 97, and the pressure on the support beam 9 is evenly distributed to each plunger 95, compensating for the flatness error of the top of the pier shaft 2. In the preferred embodiment, when the levelness error of the support beam 9 between the pier shafts 2 is different, the levelness of the support beam 9 can be adjusted by injecting different volumes of hydraulic oil into each sliding seat 93.

[0057] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, the present application is intended to include such modifications and variations if they fall within the scope of the claims of the present application and their equivalents.

Claims

1. A continuous pier-beam construction bridge erection system suitable for three-dimensional superimposed elevated highways, characterized by: The invention comprises at least two main beams (6), the main beams being supported on the top of the box beam (17), the cap beam (15) or the pier body (2) through legs, and a supporting crossbeam (9) being provided between the legs and the pier body (2), the supporting crossbeam (9) spanning the tops of the plurality of pier bodies (2); A crane is provided on the top of the main beam (6), and the crane is provided with a lifting trolley (402) that can move laterally and is used to lift and install the cap beam (15) and the box beam (17); A rotating crane (21) is also provided on the top of the main beam (6) for cooperating with the overhead crane to hoist the prefabricated pier body (24) from the bridge deck; The cap beam (15) is divided into two pieces along the longitudinal direction. The two cap beams (15) are hoisted separately, and the two cap beams (15) are fixedly connected to each other when they are at the top of the pier body (2).

2. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to claim 1 is characterized by: The structure of the rotating crane (21) is as follows: the crane body (211) is slidably arranged on the main beam (6); a space with one side open for accommodating the prefabricated pier body (24) is provided in the middle of the crane body (211); pulley blocks (215) driven by a driving device (213) are provided on both sides of the space; the movable pulley block of the pulley block (215) is connected to the rotating shaft (212); the rotating shaft (212) is connected to the clamp (216); and the clamp (216) is used to connect to the prefabricated pier body (24). The axis of the rotating shaft (212) is close to a vertical position of a vertical line passing through the center of mass of the prefabricated pier body (24) and the hoop (216).

3. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to claim 2 is characterized by: The prefabricated pier body (24) is a non-dismantling formwork of the pier body or a non-dismantling formwork with a steel cage inside.

4. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to any one of claims 1 to 3 is characterized by: There are two main beams (6), and a rear support leg (3), a middle support leg (7), a front middle support leg (10) and a front support leg (11) are sequentially provided along the main beam (6); the rear support leg (3), the middle support leg (7), the front middle support leg (10) and the front support leg (11) are movable relative to the main beam (6), and the moving direction is the length direction of the main beam (6); The rear support leg (3), the front middle support leg (10), and the front support leg (11) are provided with a lifting hydraulic cylinder and a guide mechanism to achieve the lifting of the support legs, so that the front middle support leg (10) is supported on the top of the cap beam (15) or on the top of the pier body (2) through the supporting cross beam (9); The middle support leg (7), the front middle support leg (10), and the front support leg (11) fall on the transverse track (8). Wheel boxes are provided at the bottom of the middle support leg (7) and the front middle support leg (10) for moving along the transverse track (8). During the movement, the rear support leg (3) and the front support leg (11) are in a raised state. A first car (4) and a second car (5) are provided on the main beam (6), and a rotating sling (19) is provided below the first car (4) and the second car (5). The rotating sling (19) is used to rotate the cap beam (15) transported along the surface of the box beam (17) horizontally by 90 degrees in the air so as to be installed on the top of the pier body (2).

5. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to claim 4 is characterized by: In the rotating sling (19), a connecting beam (191) is used to connect with the cap beam (15), a hinge seat (193) is provided at the middle position of the connecting beam (191), the hinge seat (193) is hinged to the bottom of the shaft, the shaft is rotatably connected to the sling beam (194), and the sling beam (194) is connected to the first trolley (4) and the second trolley (5); The hinge seat (193) is slidably connected to the connecting beam (191), and a position adjustment oil cylinder (192) is provided between the hinge seat (193) and the connecting beam (191) to adjust the balance of the connecting beam (191).

6. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to any one of claims 1 to 3, characterized in that: There are two main beams (6), and a rear support leg (3), a middle support leg (7), a front middle support leg (10) and a front support leg (11) are sequentially provided along the main beam (6); the rear support leg (3), the middle support leg (7), the front middle support leg (10) and the front support leg (11) are movable relative to the main beam (6), and the moving direction is the length direction of the main beam (6); The rear support leg (3), the front middle support leg (10) and the front support leg (11) are provided with a lifting hydraulic cylinder and a guide mechanism to realize the lifting of the support legs, so that the front middle support leg (10) is supported on the top of the cap beam (15) or supported on the top of the pier body (2) through the supporting cross beam (9); The middle support leg (7), the front middle support leg (10), and the front support leg (11) fall on the transverse track (8). Wheel boxes are provided at the bottom of the middle support leg (7) and the front middle support leg (10) for moving along the transverse track (8). During the movement, the rear support leg (3) and the front support leg (11) are in a raised state. A beam transport trolley (20) for transporting the cap beam (15) is also provided. A turntable is provided on the top of the beam transport trolley (20) so as to realize a horizontal rotation of 90° on the surface of the box beam (17) through the cooperation of the overhead crane.

7. The continuous construction bridge-building system for piers and beams for ensuring traffic flow of a three-dimensional superimposed elevated highway according to any one of claims 1 to 3 and 5, characterized in that: A sliding seat (93) is provided at the bottom of the beam body (91) supporting the cross beam (9), and the sliding seat (93) is slidable along the beam body (91). The number of the sliding seats (93) is consistent with the number of the corresponding pier bodies (2). The top of the sliding seat (93) is connected to the grooves on both sides of the beam body (91) through the hanging wheel (92). A gap is provided between the hanging wheel (92) and the groove. When the beam is dropped, the beam body (91) falls on the top of the sliding seat (93); A plurality of extension seats (94) are provided at the bottom of the sliding seat (93), the extension seats (94) avoid the steel bars (96), and a plunger (95) is provided at the bottom of the extension seat (94), and the plunger (95) is movably provided in a vertical cylinder (97); A communication port (99) is provided between the cylinder bodies (97) of the plungers (95), and a liquid inlet (98) is provided on one of the cylinder bodies (97).

8. A construction method for a continuous pier-beam construction bridge system suitable for a three-dimensional superimposed elevated highway as claimed in any one of claims 4 to 5 and 7, characterized in that: The following steps are involved: S01, move the two overhead cranes to the tail of the main beam (6), so that the main beam (6) moves forward to the top of the N+1 pier (2), the front support legs (11) and the front middle support legs (14) are retracted, the front support legs (11) and the supporting crossbeam (9) pass over the N+1 pier (2) and hang in the air, and the front middle support legs (14) and the supporting crossbeam (9) move to the front side support of the top of the N+1 pier (2); The main beam (6) is advanced to the top of the N+2 pier (2); S02, the transport vehicle transports the prefabricated pier body (24) along the bridge deck to the position of the bridge head, the second vehicle (5) and the rotary crane (21) transport the prefabricated pier body (24) to the position of the N+2 pier body (2) by lifting, the second vehicle (5) cooperates with the rotary crane (21) to lower the prefabricated pier body (24) so that the prefabricated pier body (24) is vertically installed at the preset position, and then concrete is poured to form the pier body (2); S03, the front support leg (11) and the supporting beam (9) are moved to the front side support of the top of the N+2 pier (2), and the front middle support leg (14) and the supporting beam (9) are moved to the vicinity of the N+2 pier (2) and are suspended in the air; S04, the beam transport vehicle (23) transports the first cap beam (151) along the bridge deck to the bottom of the rotating hoist (19), the first car (4) and the second car (5) lift the first cap beam (151), rotate it 90 degrees horizontally above the N+1 pier (2), and hoist the first cap beam (151) to the rear side of the top of the N+1 pier (2); Hoisting the second cap beam (152) on the rear side of the top of the N+1 pier (2), and connecting the second cap beam (152) and the first cap beam (151) into a whole; S05, the beam transport vehicle transports the box beam (17) to the bridge head along the bridge deck, the first vehicle (4) and the second vehicle (5) hoist the box beam (17) onto the cap beam between the N pier (2) and the N+1 pier (2), and laterally moves the entire main beam (6) so that multiple box beams (17) are arranged along the transverse direction of the bridge; S06, the middle support leg (7) moves to the front side of the top of the N+1 pier (2) and falls on the second cap beam (152); The front supporting leg (11) and the front middle supporting leg (14) are retracted, the front supporting leg (11) and the supporting crossbeam (9) are suspended over the N+2 pier body (2), and the front middle supporting leg (14) and the supporting crossbeam (9) are moved to the front side support of the top of the N+2 pier body (2); Repeat the above steps to realize the continuous construction of piers and beams of the three-dimensional superimposed elevated road to ensure traffic without touching the ground.

9. A construction method for a continuous pier-beam construction bridge erection system suitable for a three-dimensional superimposed elevated highway as claimed in any one of claims 6 to 7, characterized in that: The following steps are involved: S11, move the two overhead cranes to the tail end of the main beam (6), so that the main beam (6) moves forward to the top of the N+1 pier (2), the front support leg (11) and the supporting beam (9) pass over the top of the N+1 pier (2), and the front middle support leg (10) and the supporting beam (9) move to the front side support of the top of the N+1 pier (2); S12, the transport vehicle transports the prefabricated pier body (24) along the bridge deck to the position of the bridge head, the second vehicle (5) and the rotary crane (21) transport the prefabricated pier body (24) to the position of the N+2 pier body (2) by lifting, the second vehicle (5) is lowered to vertically install the prefabricated pier body (24) at the preset position, and then concrete is poured to form the pier body (2); S13, moving the overhead crane to the tail end of the main beam (6); so that the main beam (6) moves forward to the top of the N+2 pier (2); The front support leg (11) and the supporting beam (9) are moved to the front side support of the top of the N+2 pier (2); S14, two beam transporting trolleys (20) transport the first cap beam (151) to the bridge head along the bridge deck in a lifting manner, and the middle support leg (16) retracts to a position close to the rear support leg (18) to avoid the rotation range of the first cap beam (151); The overhead crane is connected to the first lifting point of the first cap beam (151), and the other end of the first cap beam (151) is located on a beam transport trolley (20). The main beam (6) moves laterally in coordination with the overhead crane moving along the bridge and the beam transport trolley (20), thereby assisting the first cap beam (151) to rotate 90 degrees horizontally on the bridge deck. The first cap beam (151) first falls on two beam transport trolleys (20) located at the bridge head, waiting for hoisting; The bridge head position refers to the end position of the bridge deck after the box girder (17) is laid; S15, the overhead crane is connected to the first cap beam (151), and the first cap beam (151) is hoisted to the rear side of the top of the N+1 pier (2); S16, rotating the second cap beam (152) 90° horizontally on the bridge deck according to step S14, and placing it on two beam transport trolleys (20) located at the bridge head, waiting for hoisting; S17, the middle support leg (16) moves forward to the bridge head position for support, and the front middle support leg (10) and the supporting beam (9) move over the top of the N+1 pier (2) and hang in the air; S18, hoisting the second cap beam (152) on the front side of the top of the N+1 pier body (2), and connecting the second cap beam (152) and the first cap beam (151) into a whole; S19, two beam transporting trolleys (20) transport the box beam (17) to the bridge head along the bridge deck, the first trolley (4) and the second trolley (5) hoist the box beam (17) onto the cap beam between the N pier (2) and the N+1 pier (2), and move the bridge erection system transversely so that multiple box beams (17) are arranged along the transverse direction of the bridge; Repeat the above steps to realize the continuous construction of piers and beams of the three-dimensional superimposed elevated road to ensure traffic without touching the ground.

10. The construction method of the continuous pier-beam bridge-building system for ensuring traffic flow of a three-dimensional superimposed elevated highway according to claim 9 is characterized by: In step S14, the first cap beam (151) is transported longitudinally to the bridge head, the overhead crane moves to the top of the middle of the first cap beam (151), and is hoisted and connected to the first lifting point near the middle of the first cap beam (151). The first lifting point is lifted so that one end of the first cap beam (151) is separated from the corresponding beam transport trolley (20), and the other end of the first cap beam (151) falls on the top of the remaining beam transport trolley (20). The beam transport trolley (20) and the overhead crane jointly lift part of the first cap beam (151) to the outside of the bridge head. At this time, the beam transport trolley (20) is located at the bridge head position, the main beam (6) moves horizontally, and the overhead crane cooperates to move backward to realize the rotation of the first cap beam (151). The overhead crane retreats to the bridge head position and hoists the first cap beam (151) after rotating 90° back onto the two beam transport trolleys (20), realizing the operation of rotating the first cap beam (151) 90° horizontally on the bridge deck.

11. The construction method of the continuous construction bridge-building system for ensuring traffic flow of a three-dimensional superimposed elevated highway according to any one of claims 8 to 9, characterized in that: Before the supporting beam (9) falls on the top of the pier body (2), the position of the sliding seat (93) is moved so that the extension seat (94) avoids the end of the steel bar (96), and the plunger (95) falls on the top of the pier body (2); Hydraulic oil is injected into the liquid inlet (98) to extend the plunger (95) to contact the top of the pier body (2). The pressure of the hydraulic oil is balanced between the cylinders (97), and the pressure on the supporting beam (9) is evenly distributed to the plungers (95), compensating for the flatness error of the top of the pier body (2).

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