A truss integral lifting bridge high pier climbing formwork device and construction method

Abstract

A truss integral lifting type bridge high pier climbing formwork device and construction method, four embedded climbing rail fixing parts on the rectangular corners of the bridge pier are all provided with climbing rails, the upper end of the climbing rail is provided with a top truss operating platform, the lower end is provided with a climbing rail anchor bolt, an outer formwork is provided between two circumferentially adjacent climbing rails, an inner formwork is provided on the inner side of the outer formwork, an outer formwork truss operating platform is provided on the outer side of the climbing rail, a hydraulic jacking mechanism is provided between the outer formwork truss operating platform and the climbing rail, the outer formwork truss operating platform is connected to the top truss operating platform through a first hydraulic lifting mechanism, an inner formwork truss operating platform is provided on the inner side of the inner formwork, and the inner formwork truss operating platform is connected to the top truss operating platform through a second hydraulic lifting mechanism; the construction method comprises installing the climbing rails and the top truss operating platform; lifting the outer formwork and the outer formwork truss operating platform and pouring the pier body solid transition section concrete; climbing rail jacking; installing the inner formwork and the inner formwork truss operating platform; constructing the standard section of the bridge pier body; and dismantling the entire structure.

Description

Technical Field

[0001] The invention belongs to the technical field of casting bridge piers, and in particular relates to a truss integral lifting type high pier climbing formwork system and a construction method. Background Art

[0002] At present, the trunk lines of the national expressway network have been completed, and the expressway branches and connecting lines in better areas have also been built. In the future, the construction of expressways will focus on mountain branch lines, connecting lines, and expressways in the mountainous areas of the Northwest. The construction of expressways has gradually extended to mountainous areas, where the terrain is steep and the terrain is mostly deep gullies and steep slopes. High-pier and large-span continuous rigid frame bridges are widely used in mountain road construction due to their own advantages. In the construction of future expressway projects, high-pier construction will be a topic we will often face in the future.

[0003] Conventional high pier construction methods include flip formwork, sliding formwork, and climbing formwork. The flip formwork method involves many high-altitude hoisting operations, uncontrollable safety hazards, slow construction progress, and long construction duration, which results in high costs for supporting equipment and management, and low economic benefits. The sliding formwork method has relatively good safety during the construction process, but the sliding formwork system must be dismantled at high altitude, which poses great safety hazards. The most serious problem is that product quality is difficult to control. In the ordinary climbing formwork method, the climbing process requires each side of the formwork to be climbed separately, which poses great safety risks and requires many repeated processes, long working hours, and the climbing formwork system must be dismantled at high altitude after the construction is completed, which poses great safety hazards. At the same time, the ordinary climbing formwork uses wooden formwork panels and has many tension screw holes, which affects the appearance quality of the product, but the overall work efficiency is not high, which leads to high costs for supporting equipment and management, and low overall economic benefits.

[0004] Safety is currently the highest red line management during the construction process, especially for incidents that may cause mass casualties, and it must be guaranteed from the intrinsic safety of the technology and the reliability of the solution. However, there are major safety hazards in the conventional high pier construction methods, and the safety risks are uncontrollable. At present, a set of safe, reliable and efficient high pier construction methods and devices are urgently needed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of existing high pier construction methods and devices, and to provide a truss integral lifting bridge high pier climbing formwork device with high construction efficiency, safety and reliability, good high pier quality and high economic benefit.

[0006] The technical solution adopted to solve the above technical problems is: four climbing rails are arranged on the four embedded climbing rail fixing parts on the four corners of the rectangle of the bridge pier, the upper end of the climbing rail is provided with a top truss operating platform, the lower end is provided with a climbing rail anchor bolt, an outer formwork is arranged between two circumferentially adjacent climbing rails, an inner formwork is arranged on the inner side of the outer formwork, the outer formwork and the inner formwork are connected through inner and outer formwork tie rods, an outer formwork truss operating platform fixedly connected to the outer formwork is arranged on the outer side of the climbing rail, a hydraulic jacking mechanism is arranged between the outer formwork truss operating platform and the climbing rail, the outer formwork truss operating platform is connected to the top truss operating platform through the outer formwork truss hanger and the first hydraulic lifting mechanism, an inner formwork truss operating platform fixedly connected to the inner formwork is arranged on the inner side of the inner formwork, the inner formwork truss operating platform is connected to the top truss operating platform through the inner formwork truss hanger and the second hydraulic lifting mechanism.

[0007] As a preferred technical solution, the hydraulic jacking mechanism consists of a jacking jack, a first fulcrum automatic conversion self-locking mechanism, and a second fulcrum automatic conversion self-locking mechanism. The base of the jacking jack and the second fulcrum automatic conversion self-locking mechanism are arranged on the outer mold truss operating platform, the second fulcrum automatic conversion self-locking mechanism is located below the jacking jack, and the first fulcrum automatic conversion self-locking mechanism is arranged on the power end of the jacking jack. The first fulcrum automatic conversion self-locking mechanism and the second fulcrum automatic conversion self-locking mechanism are both located in the track groove of the climbing rail.

[0008] As a preferred technical solution, the first fulcrum automatic conversion self-locking mechanism is composed of two rigid card plates hinged at one end and a spring arranged between the other ends. Card blocks distributed at equal intervals are arranged in the climbing rail track groove. The distance between two adjacent card blocks is ≤ the stroke of the lifting jack. A through groove is processed in the middle of the card block. The distance between the upper ends of the two card plates in the state of natural contraction of the spring is greater than the width of the through groove> the distance between the upper ends of the two card plates when the spring is compressed to the minimum length. The second fulcrum automatic conversion self-locking mechanism has the same structure as the first fulcrum automatic conversion self-locking mechanism.

[0009] As a preferred technical solution, the first hydraulic lifting mechanism is a first lifting boom provided with a first through-hole jack, the upper end of the first lifting boom is fixed on the top truss operating platform, the lower end is fixed on the inner side of the outer mold truss operating platform, and the base of the first through-hole jack is fixed on the outer mold truss operating platform; the second hydraulic lifting mechanism is a second lifting boom provided with a second through-hole jack, the upper end of the second lifting boom is fixed on the top truss operating platform, the lower end is fixed on the inner mold truss operating platform, and the base of the second through-hole jack is fixed on the inner mold truss operating platform.

[0010] As a preferred technical solution, the outer mold truss operating platform is provided with an elastic roller, and the elastic roller is located between the outer mold truss operating platform and the climbing rail.

[0011] As a preferred technical solution, the climbing rail is a steel box girder structure, and the length of the climbing rail is greater than the construction length of the three-section bridge high pier body segment.

[0012] The present invention also provides a construction method of a truss integral lifting bridge high pier climbing formwork device, comprising the following steps:

[0013] S1. Install climbing rails

[0014] The four climbing rails are fixed on the climbing rail fixing components pre-buried on the bridge pier to ensure the verticality of the climbing rails. After the climbing rails are installed, three temporary wind ropes are pulled on each climbing rail;

[0015] S2. Install the top truss operating platform and the first section of pier reinforcement

[0016] After the top truss operating platform is assembled on the ground, it is hoisted and fixed on the top of the climbing rail by lifting equipment, and then the vertical and horizontal steel bars of the first section of the pier are installed on the embedded steel bars on the bridge pier; the outer formwork and the outer formwork truss operating platform are installed at the lower end of the climbing rail, and then the concrete of the first section of the pier is poured;

[0017] S3. Lift the external formwork and external formwork truss operating platform and pour the pier body solid transition section concrete

[0018] a. After the concrete reaches the demoulding strength, the outer formwork is removed for demoulding, and the first lifting sling and the first through-hole jack are installed. The outer formwork and the outer formwork truss operating platform are raised by the first lifting sling and the first through-hole jack to the height of one concrete pouring section at a time;

[0019] b. After the outer formwork and the outer formwork truss operating platform are lifted to the specified height, the outer formwork is fixed on the climbing rail, the outer formwork truss hanger is installed, the first lifting hanger and the first through-hole jack are removed, and then the solid transition section concrete of the pier body is poured;

[0020] S4. Climbing rails and lifting

[0021] a. If the strength of the newly poured concrete is greater than 7.5Mpa, remove the hanger rods of the outer formwork truss, the anchor bolts between the climbing rail and the concrete pier surface, and the threaded connectors between the climbing rail and the outer formwork in turn;

[0022] b. The outer formwork and the outer formwork truss operating platform are used as fixed support force points. The climbing rail and the top truss operating platform are lifted to the specified height by jacking jacks in batches and continuously. Then the track is fixed on the concrete pier by the climbing rail anchor bolts.

[0023] c. Install the first lifting suspender and the first through-hole jack, lift the outer formwork and the outer formwork truss operating platform as a whole into place at one time through the first through-hole jack, fix the outer formwork on the climbing rail, install the outer formwork truss suspender, and remove the first lifting suspender and the first through-hole jack;

[0024] S5. Install the inner formwork and inner formwork truss operating platform;

[0025] The inner formwork is hoisted at a specified height by a lifting device, and the inner formwork is fixedly connected to the outer formwork by a pair of inner and outer formwork tie rods. The inner formwork truss operating platform is then hoisted at a specified height by a lifting device, and the inner formwork truss operating platform is fixedly connected to the inner formwork. The inner formwork truss operating platform is fixedly connected to the top truss operating platform by an inner formwork truss hanging rod;

[0026] S6. Construction of standard sections of bridge piers

[0027] a. After pouring concrete between the inner and outer formwork, install the segmental steel bars, and when the concrete strength is greater than 7.5Mpa, remove the threaded connectors between the inner formwork truss hanger, the outer formwork truss hanger, and the outer formwork and the climbing rail;

[0028] b. The outer formwork and the outer formwork truss operating platform are used as fixed support force points. The climbing rail and the top truss operating platform are lifted to the specified height by jacking jacks in batches and continuously. Then the track is fixed on the concrete pier by the climbing rail anchor bolts.

[0029] c. Install the first lifting sling and the first through-hole jack and the second lifting sling and the second through-hole jack, remove the outer formwork and the inner formwork for demoulding, and lift the outer formwork and the outer formwork truss operating platform as a whole into place at one time through the first through-hole jack; lift the inner formwork and the inner formwork truss operating platform as a whole into place at one time through the second through-hole jack;

[0030] d. Fix the outer formwork on the climbing rail, install the outer formwork truss hanger and the inner formwork truss hanger, remove the first lifting hanger and the first through-hole jack and the second lifting hanger and the second through-hole jack, fix the inner formwork with the outer formwork through the inner and outer formwork tie rods, and pour the concrete of the new pier section;

[0031] e. Repeat steps a to d to complete the concrete construction of a pier;

[0032] S7. Dismantling of the entire structure

[0033] First, remove the inner formwork and inner formwork truss operating platform on the pier top and lift them back to the ground using lifting equipment. The outer formwork truss operating platform is lifted by the first hydraulic lifting mechanism in the reverse operation, and the climbing rail and top truss operating platform are lifted by the hydraulic jacking mechanism in the reverse operation. The cycle is repeated until they reach the ground and are then removed.

[0034] As a preferred technical solution, the method for continuous lifting of the climbing rail jacking jack in steps S4 and S6 is as follows: the second fulcrum located on the power end of the jacking jack automatically switches to a self-locking mechanism that is stuck in the track groove of the climbing rail, and the power end of the jacking jack extends out through the first fulcrum to automatically switch to a self-locking mechanism to raise the climbing rail and the top truss operating platform. When the jacking jack completes a stroke, the second fulcrum located below the jacking jack automatically switches to a self-locking mechanism that is stuck in the track groove of the climbing rail to prevent the climbing rail and the top truss operating platform from sliding down. Then the power end of the jacking jack is reset and the next lifting is carried out. The lifting is repeated in this way until the climbing rail and the top truss operating platform reach a specified height.

[0035] The beneficial effects of the present invention are as follows:

[0036] The top truss operating platform of the present invention also serves as a steel bar positioning auxiliary frame, so that workers can conveniently carry out the positioning and binding work of long-segment vertical main steel bars (9m / 12), and the horizontal stirrups are bound synchronously. When binding the horizontal stirrups, the workers can adjust the platform height as needed to always maintain the optimal working height, thereby fully improving the workers' steel bar binding efficiency.

[0037] The present invention has only four large-area outer templates and four large-area inner templates. The outer templates are positioned by climbing rails, and the installation and positioning are convenient and fast.

[0038] The present invention controls the climbing of the climbing rail and the top truss operating platform by controlling the lifting jack, and controls the climbing of the outer formwork and the outer formwork truss operating platform, the inner formwork and the inner formwork truss operating platform by controlling the first through-hole jack and the second through-hole jack. An operator can complete the climbing work of the entire structural system alone, and does not require the cooperation of other equipment (such as a tower crane) or other manual auxiliary operations. In addition, the hydraulic jack has a fast lifting speed, high efficiency, cost saving, and good economic benefits.

[0039] After the high pier is constructed, the whole set of knot system is returned to the ground for dismantling operation, which is safer and more reliable than the high-altitude demolition construction system in the prior art.

[0040] The present invention combines the advantages of climbing formwork principle, sliding formwork principle and flipping formwork, can better balance progress, quality, safety and economic benefits, is a comprehensive innovation in high pier construction, has broad application prospects and huge market opportunities. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the structure of the present invention in the rail climbing and jacking state.

[0042] Figure 2 It is a schematic diagram of the structure of the present invention when the inner template 11 and the outer template 13 are lifted.

[0043] Figure 3It is a structural schematic diagram of the top truss operating platform 1.

[0044] Figure 4 It is a schematic diagram of the structure in which the outer template 13 and the inner template 11 are connected.

[0045] Figure 5 It is a structural schematic diagram of the outer mold truss operating platform 3 and the inner mold truss operating platform 12.

[0046] Figure 6 It is a structural schematic diagram of the connection between the climbing rail and the lifting jack 2.

[0047] Figure 7 It is a structural diagram of the first fulcrum automatic conversion self-locking mechanism 21.

[0048] Figure 8 It is a schematic diagram of the structure of the first fulcrum automatic conversion self-locking mechanism 21 and the second fulcrum automatic conversion self-locking mechanism 22 in the climbing rail 4.

[0049] Among them: top truss operating platform 1; jacking jack 2; outer mold truss operating platform 3; climbing rail 4; climbing rail anchor bolt 5; embedded climbing rail fixing part 6; bridge pier 7; steel bar 8; concrete pier body 9; external repair hanger 10; inner mold 11; inner mold truss operating platform 12; outer mold 13; inner mold truss hanger 14; outer mold truss hanger 15; first through-hole jack 16; first lifting hanger 17; second through-hole jack 18; second lifting hanger 19; inner and outer mold tie rods 20; first fulcrum automatic conversion self-locking mechanism 21; second fulcrum automatic conversion self-locking mechanism 22; elastic roller 23; inner repair hanger 24; DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the present invention is not limited to the following embodiments.

[0051] exist Figures 1 to 8In the embodiment, four climbing rails 4 are fixedly installed on four pre-buried climbing rail fixing members 6 located at the four corners of the rectangle on the bridge pier 7 of the truss integral lifting bridge high pier climbing formwork device. The climbing rail 4 is a steel box girder structure with strong side wind resistance and good bearing capacity to prevent sudden gusts of wind from high altitude from threatening the structural system. The length of the climbing rail 4 is greater than the construction length of three sections of the high pier body of the bridge. The upper end of the climbing rail 4 is fixedly installed with a top truss operating platform 1 by a threaded fastening connector, and the lower end is installed with a climbing rail anchor bolt 5. During the construction process, the climbing rail anchor bolt 5 is anchored on the concrete pier body 9 of the lower segment. An outer formwork 13 is fixedly installed between two circumferentially adjacent climbing rails 4 by a threaded fastening connector. An inner formwork 11 is arranged on the inner side of the outer formwork 13. The outer formwork 13 and the inner formwork 11 are connected to each other. The inner formwork 11 is connected through the inner and outer formwork tie rods 20, an outer formwork truss operating platform 3 is installed on the outer side of the climbing rail 4, and the outer formwork truss operating platform 3 is fixedly connected to the outer formwork 13 through a threaded fastening connector, the base of the jacking jack 2 is fixedly installed on the outer formwork truss operating platform 3 with a threaded fastening connector, and the end of the piston rod is fixedly connected to the first fulcrum automatic conversion self-locking mechanism 21 through a connecting rod. The structure of the first fulcrum automatic conversion self-locking mechanism 21 is that the lower ends of two rigid card plates are hinged and fixed to the connecting rod, and a spring is installed between the upper ends. The outer formwork truss operating platform 3 below the jacking jack 2 is fixedly connected to the second fulcrum automatic conversion self-locking mechanism 22 through an ear plate, and the second fulcrum automatic conversion self-locking mechanism 22 is connected to the first fulcrum automatic conversion self-locking mechanism 21. The automatic conversion self-locking mechanism 21 is the same. The first fulcrum automatic conversion self-locking mechanism 21 and the second fulcrum automatic conversion self-locking mechanism 22 are both located in the track groove of the climbing rail 4. The track groove of the climbing rail 4 is equipped with equally spaced card blocks. The distance between two adjacent card blocks is ≤ the stroke of the lifting jack 2. A through groove is processed in the middle of the card block. The distance between the upper ends of the two card plates in the state of natural contraction of the spring is greater than the width of the through groove. The distance between the upper ends of the two card plates in the state of compression of the spring to the minimum length is located below the second fulcrum automatic conversion self-locking mechanism 22. An elastic roller 23 is installed on the outer mold truss operating platform 3. The elastic roller 23 contacts the climbing rail 4 and is used to position the climbing rail 4 during the jacking process of the climbing rail 4. The climbing rail 4 and the top truss operating platform 1 need to be jacked. When the lifting jack 2 is lifted, the upper end of the first fulcrum automatic conversion self-locking mechanism 21 is stuck on the block of the climbing rail 4, and the power end of the jacking jack 2 is extended to raise the climbing rail 4 and the top truss operating platform 1. When the lifting jack 2 completes a stroke, the second fulcrum automatic conversion self-locking mechanism 22 located below the jacking jack 2 is just stuck on the block in the track groove of the climbing rail 4 to prevent the climbing rail 4 and the top truss operating platform 1 from sliding down. The outer mold truss operating platform 3 is fixedly connected to the top truss operating platform 1 through the outer mold truss suspension rod 15 and the first hydraulic lifting mechanism. The first hydraulic lifting mechanism is composed of a first lifting suspension rod 17 and a first through-hole jack 16. The first through-hole jack 16 is fixedly installed on the inner side of the outer mold truss operating platform 3 with a threaded fastening connector.The upper end of the first lifting suspension rod 17 is fixedly mounted on the top truss operating platform 1 by a threaded fastening connector, and the lower end is fixedly mounted on the outer mold truss operating platform 3 by a threaded fastening connector through the first through-core jack 16. The upper end of the outer mold truss suspension rod 15 is fixedly mounted on the top truss operating platform 1 by a threaded fastening connector, and the lower end is fixedly mounted on the outer side of the outer mold truss operating platform 3 by a threaded fastening connector. The inner mold truss operating platform 12 is fixedly mounted on the inner side of the inner mold 11 by a threaded fastening connector. The inner mold truss operating platform 12 is connected to the top truss operating platform 1 through the inner mold truss suspension rod 14 and the second hydraulic lifting mechanism. The second hydraulic lifting mechanism is composed of a second lifting suspension rod 19 and a second through-core jack 18. The second through-core jack 18 is fixedly mounted on the inner side of the inner mold truss operating platform 12 by a threaded fastening connector. The upper end of the lifting suspender 19 is fixedly installed on the top truss operating platform 1 with a threaded fastening connector, and the lower end is fixedly installed on the inner mold truss operating platform 12 with a threaded fastening connector through the second through-hole jack 18. The upper end of the inner mold truss suspender 14 is fixedly installed on the top truss operating platform 1 with a threaded fastening connector, and the lower end is fixedly installed on the outside of the inner mold truss operating platform 12 with a threaded fastening connector. The first hydraulic lifting mechanism is used to lift the outer mold 13 and the outer mold truss operating platform 3, and the second hydraulic lifting mechanism is used to lift the inner mold 11 and the inner mold truss operating platform 12. The outer mold truss operating platform 3 is fixedly installed with an outer repair hanger 10 with a threaded fastening connector at the bottom, and the inner mold truss operating platform 12 is fixedly installed with an inner repair hanger 24 with a threaded fastening connector at the bottom, which is used by workers to repair some defects on the surface of the bridge pier.

[0052] The construction method of the above device comprises the following steps:

[0053] S1. Install climbing rail 4

[0054] The four climbing rails 4 are fixedly installed on the climbing rail 4 fixing components pre-buried on the bridge pier 7 to ensure the verticality of the climbing rails 4. After the climbing rails 4 are installed, three temporary wind ropes are pulled on each climbing rail 4;

[0055] S2. Install the top truss operating platform 1 and the first section of the pier reinforcement

[0056] After the top truss operating platform 1 is assembled on the ground, it is hoisted and fixed on the top of the climbing rail 4 by the lifting equipment, and then the vertical and horizontal steel bars of the first section of the pier are installed on the embedded steel bars on the bridge pier 7; the outer formwork 13 and the outer formwork truss operating platform 3 are installed at the lower end of the climbing rail 4, and then the concrete of the first section of the pier is poured;

[0057] S3. Lift the outer formwork 13 and the outer formwork truss operating platform 3 and pour the pier body solid transition section concrete

[0058] a. After the concrete reaches the demolding strength, the outer formwork 13 is removed for demolding, and the first lifting suspender 17 and the first through-hole jack 16 are installed. The outer formwork 13 and the outer formwork truss operating platform 3 are raised as a whole by one concrete pouring section at a time through the first lifting suspender 17 and the first through-hole jack 16;

[0059] b. After the outer formwork 13 and the outer formwork truss operating platform 3 are lifted to the specified height, the outer formwork 13 is fixed on the climbing rail 4, the outer formwork truss hanger 15 is installed, the first lifting hanger 17 and the first through-hole jack 16 are removed, and then the solid transition section concrete of the pier body is poured;

[0060] S4. Climbing rail 4 lifting

[0061] a. The strength of the newly poured concrete is greater than 7.5Mpa. Remove the outer formwork truss hanger 15, the anchor bolts between the climbing rail 4 and the concrete pier surface, and the threaded connector between the climbing rail 4 and the outer formwork 13 in turn;

[0062] b. The outer formwork 13 and the outer formwork truss operating platform 3 are used as a fixed support force point. The climbing rail 4 and the top truss operating platform 1 are lifted to a specified height by continuous lifting by lifting jacks in batches, and then the track is fixed to the concrete pier 9 by the climbing rail anchor bolts 5;

[0063] The method of continuous lifting of the climbing rail 4 by the lifting jack in batches is as follows: the second fulcrum automatic conversion self-locking mechanism 22 located on the power end of the lifting jack 2 is stuck in the track groove of the climbing rail 4, and the power end of the lifting jack 2 extends through the first fulcrum automatic conversion self-locking mechanism 21 to raise the climbing rail 4 and the top truss operating platform 1. When the lifting jack 2 completes a stroke, the second fulcrum automatic conversion self-locking mechanism 22 located below the lifting jack 2 is stuck in the track groove of the climbing rail 4 to prevent the climbing rail 4 and the top truss operating platform 1 from sliding down, and then the power end of the lifting jack 2 is reset to perform the next lifting, and the lifting is repeated until the climbing rail 4 and the top truss operating platform 1 reach the specified height;

[0064] c. Install the first lifting suspender 17 and the first through-hole jack 16, lift the outer formwork 13 and the outer formwork truss operating platform 3 as a whole into place at one time through the first through-hole jack, fix the outer formwork 13 on the climbing rail 4, install the outer formwork truss suspender 15, and remove the first lifting suspender 17 and the first through-hole jack 16;

[0065] S5. Install the inner formwork 11 and the inner formwork truss operating platform 12;

[0066] The inner formwork 11 is hoisted at a specified height by a lifting device, and the inner formwork 11 is fixedly connected to the outer formwork 13 by the inner and outer formwork tie rods 20, and then the inner formwork truss operating platform 12 is hoisted at a specified height by a lifting device, and the inner formwork truss operating platform 12 is fixedly connected to the inner formwork 11, and the inner formwork truss operating platform 12 is fixedly connected to the top truss operating platform 1 by the inner formwork truss hanging rod 14;

[0067] S6. Construction of standard sections of bridge piers

[0068] a. After pouring concrete between the inner formwork 11 and the outer formwork 13, install the segmental steel bars, and when the concrete strength is greater than 7.5Mpa, remove the threaded connectors between the inner formwork truss hanger 14, the outer formwork truss hanger 15, the outer formwork 13 and the climbing rail 4;

[0069] b. The outer formwork 13 and the outer formwork truss operating platform 3 are used as fixed support force points. The climbing rail 4 and the top truss operating platform 1 are lifted to a specified height by continuous lifting by lifting jacks in batches, and then the track is fixed to the concrete pier by the climbing rail anchor bolts 5;

[0070] c. Install the first lifting suspender 17 and the first through-hole jack 16 and the second lifting suspender 19 and the second through-hole jack 18, remove the outer template 13 and the inner template 11 for demoulding, and lift the outer template 13 and the outer template truss operating platform 3 as a whole into place at one time through the first through-hole jack; lift the inner template 11 and the inner template truss operating platform 12 as a whole into place at one time through the second through-hole jack;

[0071] d. Fix the outer formwork 13 on the climbing rail 4, install the outer formwork truss hanger 15 and the inner formwork truss hanger 14, remove the first lifting hanger 17 and the first through-hole jack 16 and the second lifting hanger 19 and the second through-hole jack 18, fix the inner formwork 11 and the outer formwork 13 together through the inner and outer formwork tie rods 20, and pour the concrete of the new pier section;

[0072] e. Repeat steps a to d to complete the concrete construction of a pier;

[0073] S7. Dismantling of the entire structure

[0074] First, the inner formwork 11 and the inner formwork truss operating platform 12 are removed from the pier top and hoisted back to the ground by means of lifting equipment. The outer formwork truss operating platform 3 is lifted by the first hydraulic lifting mechanism in the reverse operation, and the climbing rail 4 and the top truss operating platform 1 are lifted by the hydraulic jacking mechanism in the reverse operation. The process is repeated until they are lowered to the ground and then removed.

[0075] For the construction of high piers of bridges, the main factors that determine the construction period are the steel bar tying process and the concrete pouring process. After the concrete pouring is completed, the present invention can carry out the hoisting of the next segment of steel bars to the top truss operating platform during the time when the concrete is being poured, and the tying work of the next segment of steel bars can be carried out at the same time. The top truss operating platform also serves as a steel bar positioning auxiliary frame, so that workers can conveniently carry out the positioning and tying work of the long segment vertical main steel bars (9m), and the horizontal stirrups are tied synchronously. When tying the horizontal stirrups, the workers can adjust the platform height as needed to always maintain the best working height, fully improve the workers' steel bar tying efficiency, speed up the construction progress, shorten the construction period, and at the same time, the supporting investment equipment such as tower cranes and elevators also greatly reduces the use time, reduces the cost, and has good economic benefits. The indicators of the truss integral lifting type bridge high pier climbing formwork construction method are compared with those of the conventional construction method, as shown in Table 1.

[0076] Table 1

[0077]

Claims

1. A truss integral lifting bridge high pier climbing formwork device, characterized in that: Four climbing rails are arranged on four pre-buried climbing rail fixing members (6) at the four rectangular corners of the bridge pier (7); a top truss operating platform (1) is arranged at the upper end of the climbing rail (4); a climbing rail anchor bolt (5) is arranged at the lower end; an outer formwork (13) is arranged between two circumferentially adjacent climbing rails (4); an inner formwork (11) is arranged on the inner side of the outer formwork (13); the outer formwork (13) and the inner formwork (11) are connected via inner and outer formwork pair tie rods (20); an outer formwork fixedly connected to the outer formwork (13) is arranged on the outer side of the climbing rail (4) A truss operating platform (3), a hydraulic lifting mechanism is provided between the outer mold truss operating platform (3) and the climbing rail (4), the outer mold truss operating platform (3) is connected to the top truss operating platform (1) via the outer mold truss suspension rod (15) and the first hydraulic lifting mechanism, an inner mold truss operating platform (12) fixedly connected to the inner mold (11) is provided on the inner side of the inner mold (11), and the inner mold truss operating platform (12) is connected to the top truss operating platform (1) via the inner mold truss suspension rod (14) and the second hydraulic lifting mechanism; The hydraulic jacking mechanism is composed of a jacking jack (2), a first fulcrum automatic conversion self-locking mechanism (21), and a second fulcrum automatic conversion self-locking mechanism (22); the base of the jacking jack (2) and the second fulcrum automatic conversion self-locking mechanism (22) are arranged on the outer mold truss operating platform (3); the second fulcrum automatic conversion self-locking mechanism (22) is located below the jacking jack (2); the first fulcrum automatic conversion self-locking mechanism (21) is arranged on the power end of the jacking jack (2); the first fulcrum automatic conversion self-locking mechanism (21) and the second fulcrum automatic conversion self-locking mechanism (22) are both located in the track groove of the climbing rail (4); The first hydraulic lifting mechanism is a first lifting rod (17) on which a first through-hole jack (16) is arranged, the upper end of the first lifting rod (17) is fixedly mounted on the top truss operating platform (1), the lower end of the first lifting rod (17) is fixedly mounted on the inner side of the outer mold truss operating platform (3), and the base of the first through-hole jack (16) is fixedly mounted on the outer mold truss operating platform (3); the second hydraulic lifting mechanism is a second lifting rod (19) on which a second through-hole jack (18) is arranged, the upper end of the second lifting rod (19) is fixedly mounted on the top truss operating platform (1), the lower end of the second lifting rod (19) is fixedly mounted on the inner mold truss operating platform (12), and the base of the second through-hole jack (18) is fixedly mounted on the inner mold truss operating platform (12).

2. The truss integral lifting bridge high pier climbing formwork device according to claim 1 is characterized in that: The first fulcrum automatic conversion self-locking mechanism (21) is composed of two rigid clamping plates, one end of which is hinged and the other end of which is provided with a spring. Clamping blocks are arranged in the track groove of the climbing rail (4) at equal intervals. The distance between two adjacent clamping blocks is ≤ the stroke of the lifting jack (2). A through groove is processed in the middle of the clamping block. The distance between the upper ends of the two clamping plates in the state of natural contraction of the spring is greater than the width of the through groove and greater than the distance between the upper ends of the two clamping plates in the state of compression of the spring to the minimum length. The second fulcrum automatic conversion self-locking mechanism (22) has the same structure as the first fulcrum automatic conversion self-locking mechanism (21).

3. The truss integral lifting bridge high pier climbing formwork device according to claim 1 is characterized in that An elastic roller (23) is provided on the outer mold truss operating platform (3), and the elastic roller (23) is located between the outer mold truss operating platform (3) and the climbing rail (4).

4. The truss integral lifting bridge high pier climbing formwork device according to claim 1 is characterized in that: The climbing rail (4) is a steel box girder structure, and the length of the climbing rail (4) is greater than the construction length of the three-section bridge high pier body segment.

5. The construction method of the truss integral lifting bridge high pier climbing formwork device according to claim 1 is characterized in that The following steps are involved: S1. Install climbing rails (4) The four climbing rails (4) are respectively fixedly mounted on the climbing rail (4) fixing components pre-buried on the bridge pier (7) to ensure the verticality of the climbing rails (4). After the climbing rails (4) are installed, three temporary wind ropes are pulled on each climbing rail (4); S2. Install the top truss operating platform (1) and the first section of the pier reinforcement After the top truss operating platform (1) is assembled on the ground, it is hoisted as a whole to the top of the climbing rail (4) by a lifting device and fixed, and then the vertical steel bars and horizontal steel bars of the first section of the pier body are installed on the embedded steel bars on the bridge pier (7); the outer formwork (13) and the outer formwork truss operating platform (3) are installed at the lower end of the climbing rail (4), and then the concrete of the first section of the pier body is poured; S3. Lift the outer formwork (13) and the outer formwork truss operating platform (3) and pour the pier body solid transition section concrete a. After the concrete reaches the demoulding strength, the outer formwork (13) is removed for demoulding, and the first lifting suspender (17) and the first through-hole jack (16) are installed. The outer formwork (13) and the outer formwork truss operating platform (3) are raised as a whole by one concrete pouring section at a time by the first lifting suspender (17) and the first through-hole jack (16); b. After the outer formwork (13) and the outer formwork truss operating platform (3) are lifted to the specified height, the outer formwork (13) is fixed to the climbing rail (4), the outer formwork truss hanger (15) is installed, the first lifting hanger (17) and the first through-hole jack (16) are removed, and then the solid transition section concrete of the pier body is poured; S4. Climbing rail (4) lifting a. When the strength of the newly poured concrete is greater than 7.5Mpa, the outer formwork truss hanger (15), the anchor bolts between the climbing rail (4) and the concrete pier surface, and the threaded connector between the climbing rail (4) and the outer formwork (13) are removed in sequence; b. The outer formwork (13) and the outer formwork truss operating platform (3) are used as a fixed support force point. The climbing rail (4) and the top truss operating platform (1) are lifted to a specified height by continuous lifting with lifting jacks in batches, and then the track is fixed to the concrete pier by the climbing rail anchor bolts (5); c. Install the first lifting suspender (17) and the first through-hole jack (16), lift the outer formwork (13) and the outer formwork truss operating platform (3) as a whole into place at one time through the first through-hole jack, fix the outer formwork (13) on the climbing rail (4), install the outer formwork truss suspender (15), and remove the first lifting suspender (17) and the first through-hole jack (16); S5. Install the inner formwork (11) and the inner formwork truss operating platform (12); The inner formwork (11) is hoisted at a specified height by a lifting device, and the inner formwork (11) is fixedly connected to the outer formwork (13) by means of inner and outer formwork tie rods (20), and the inner formwork truss operating platform (12) is then hoisted at a specified height by a lifting device, and the inner formwork truss operating platform (12) is fixedly connected to the inner formwork (11), and the inner formwork truss operating platform (12) is fixedly connected to the top truss operating platform (1) by means of an inner formwork truss hoist rod (14); S6. Construction of standard sections of bridge piers a. After pouring concrete between the inner formwork (11) and the outer formwork (13), install the segmental steel bars, and when the concrete strength is greater than 7.5Mpa, remove the threaded connectors between the inner formwork truss hanger (14), the outer formwork truss hanger (15), the outer formwork (13) and the climbing rail (4); b. The outer formwork (13) and the outer formwork truss operating platform (3) are used as a fixed support force point. The climbing rail (4) and the top truss operating platform (1) are lifted to a specified height by continuous lifting with lifting jacks in batches, and then the track is fixed to the concrete pier by the climbing rail anchor bolts (5); c. Install the first lifting rod (17) and the first through-hole jack (16) and the second lifting rod (19) and the second through-hole jack (18), remove the outer template (13) and the inner template (11) for demoulding, and lift the outer template (13) and the outer template truss operating platform (3) as a whole into place at one time through the first through-hole jack; lift the inner template (11) and the inner template truss operating platform (12) as a whole into place at one time through the second through-hole jack; d. Fix the outer formwork (13) on the climbing rail (4), install the outer formwork truss hanger (15) and the inner formwork truss hanger (14), remove the first lifting hanger (17) and the first through-hole jack (16) and the second lifting hanger (19) and the second through-hole jack (18), and fix the inner formwork (11) and the outer formwork (13) together through the inner and outer formwork tie rods (20), and pour the concrete of the new pier section; e. Repeat steps a to d to complete the concrete construction of a pier; S7. Dismantling of the entire structure First, the inner formwork (11) and the inner formwork truss operating platform (12) are removed from the pier top and hoisted back to the ground using a lifting device. The outer formwork truss operating platform (3) is lifted by the first hydraulic lifting mechanism in the reverse operation, and the climbing rail (4) and the top truss operating platform (1) are lowered by the hydraulic lifting mechanism in the reverse operation. The process is repeated until they are lowered to the ground and then removed.

6. The construction method of the truss integral lifting bridge high pier climbing formwork device according to claim 5 is characterized in that The method for performing the stepwise continuous lifting of the climbing rail (4) by the lifting jack in steps S4 and S6 is as follows: the second fulcrum automatic conversion self-locking mechanism (22) located on the power end of the lifting jack (2) is stuck in the track groove of the climbing rail (4), the power end of the lifting jack (2) extends through the first fulcrum automatic conversion self-locking mechanism (21) to lift the climbing rail (4) and the top truss operating platform (1), when the lifting jack (2) completes a stroke, the second fulcrum automatic conversion self-locking mechanism (22) located below the lifting jack (2) is stuck in the track groove of the climbing rail (4) to prevent the climbing rail (4) and the top truss operating platform (1) from sliding down, then the power end of the lifting jack (2) is reset and the next lifting is performed, and the lifting is repeated until the climbing rail (4) and the top truss operating platform (1) reach a specified height.

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