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CN-121992724-A - Double-hoop bracket system for triple pier capping beam and mounting and dismounting method thereof

CN121992724ACN 121992724 ACN121992724 ACN 121992724ACN-121992724-A

Abstract

The invention relates to the technical field of bridge engineering construction, in particular to a double-hoop bracket system for a triple pier capping beam and an installing and detaching method thereof. The upper hoop and the lower hoop are symmetrically and tightly held on the bridge pier, a special operation platform is arranged at the top of the lower hoop, and the platform is firmly connected with the main body structure through components such as the diagonal rod, the bracket and the like, so that a safe and stable operation space is provided for an operator to detach the upper hoop and start the unloading device, and a part of a force transmission path is also formed. In conclusion, the double-hoop bracket system realizes comprehensive improvement of bearing capacity, safety and construction efficiency through ingenious mechanical model reconstruction and humanized functional design, is particularly suitable for large-span and large-tonnage bent cap construction, and has remarkable practical value and popularization prospect.

Inventors

  • ZHANG RUI
  • LIU ZIQI
  • LIU BINGQIANG
  • SUN ZHIYONG
  • YANG RUNLAI
  • LUAN XIAOQIANG
  • YANG GUANG
  • WANG XIAOSHU
  • LI YAPING
  • LIU XU
  • ZHAO PENG
  • QU SHIJIE

Assignees

  • 中交一航局第三工程有限公司
  • 中交第一航务工程局有限公司
  • 中交一航局(海南)工程有限公司

Dates

Publication Date
20260508
Application Date
20260311

Claims (10)

  1. 1. A double-hoop support system for a triple pier capping beam is characterized by comprising a bearing system, a hoop system, an upper hoop (3) and a lower hoop (4), wherein the bearing system is erected on a pier column and is laid on the bearing girder (1) and is used for directly supporting a distribution girder (2) of a capping beam template, the upper hoop (3) supports the bearing girder (1) through a hoop bracket (301) of the upper hoop, the lower hoop (4) is located below the upper hoop (3) and is connected with the upper hoop through a diagonal brace (5) to form a stable triangular support structure, a connecting and force transferring member comprises a bolting pressing plate (6) used for connecting the bearing girder (1) with the distribution girder (2), a bolting and lacing plate (7) used for splicing the bearing girder (1) and a falling block (8) arranged between the upper hoop bracket (301) and the bearing girder (1) and used for adjusting elevation and system falling, and an auxiliary structure comprises an operation platform (401) welded on the upper hoop (4) and a node (403) connected with the steel plate (402) of the supporting platform.
  2. 2. The double-hoop bracket system for the triple pier capping beam is characterized in that I-steel is adopted for both the bearing main beam (1) and the distribution beam (2), excellent bending resistance is achieved, detachable connection is achieved between the upper flange of the bearing main beam (1) and the lower flange of the distribution beam (2) through a bolting pressing plate (6), reliable force transmission and integral stability between the main beam and the secondary beam are guaranteed, and the bearing main beam (1) is spliced by adopting bolting lacing plates (7) at the key parts of midspan or stress so as to adapt to different span requirements and ensure continuity of the main beam.
  3. 3. The double-hoop bracket system for the triple pier capping beam, which is disclosed in claim 2, is characterized in that the bolting batten plate (7) comprises a high-strength bolt three (701) and a steel plate (702), the standard length of I-steel is 12m, the length of the triple pier capping beam is far longer than 12m, and the steel plate (702) is connected by two rows of 6 high-strength bolts three (701) on one side, so that the triple pier capping beam is convenient to mount and dismount.
  4. 4. The double-hoop bracket system for the triple pier capping beam according to claim 1, wherein the bolting press plate (6) comprises an upper press plate (602) and a lower press plate (603), the upper press plate (602) presses the lower flange of the distribution beam (2) in use, and the lower press plate (603) presses the upper flange of the bearing main beam (1) in the direction.
  5. 5. The double-hoop bracket system for the triple pier capping beam according to claim 1, wherein each bracket of the upper hoop (3) is provided with a hoop bracket (301) with the thickness of 20mm at the upper, middle and lower positions, the inner side of the bracket is welded with a hoop steel belt (302), the outer side of the bracket is arc-shaped and is tightly connected with the hoop steel belt (302) through a node steel plate (303), and the hoop bracket (301) is provided with 6 high-strength bolts I (304) in double rows, so that the shearing resistance and the bending resistance of the bracket are greatly enhanced.
  6. 6. The double-hoop support system for the triple pier capping beam, which is disclosed in claim 1, is characterized in that each row of high-strength bolts (304) of the lower hoop (4) are connected through a triangular node steel plate (404), the structure can effectively disperse local stress, the overall rigidity and the encircling effect of the hoop are improved, the upper part of the lower hoop (4) is welded with a closed operation platform (401) formed by the steel plates, and the lower part of the platform is connected with the steel belt of the lower hoop (4) in a reinforcing manner through the node steel plate (402), so that the lower hoop is used as a construction channel, and the structural rigidity of the hoop is also improved.
  7. 7. The double-hoop support system for the triple pier capping beam, which is disclosed in claim 6, is characterized in that protective rails (405) with the height not lower than 1.2m are arranged around the operation platform (401), the safety standard of the high-altitude operation is met, and the bottom of the operation platform (401) is bolted with brackets (406) welded on hoop steel belts (302) through brackets (403).
  8. 8. The double-hoop bracket system for the triple pier capping beam according to claim 1, wherein the diagonal brace (5) is made of I-steel, flange plates (502) are welded at two ends of the diagonal brace, and the diagonal brace is respectively connected with the bearing main beam (1) and the working platform (401) through a common bolt I (501).
  9. 9. The double-hoop bracket system for the triple pier capping beam according to claim 1, wherein the unloading block (8) consists of an upper bracket plate (801), a lower bracket plate (802), a left sliding plate (803) and a right sliding plate (804) which are clamped between the upper bracket plate and can be transversely extracted, and the left sliding plate and the right sliding plate are connected in series through a counter-pulling screw (805), and fine adjustment of the elevation of the bracket system and smooth unloading after concrete pouring can be realized by adjusting the extraction amount of the sliding plates.
  10. 10. The method for installing and detaching the double-hoop bracket system for the triple pier capping beam is characterized by comprising the following steps of: S1, positioning and installing a lower hoop: S1.1, retesting and accurately determining a final bottom surface mounting line of a lower anchor ear according to elevation provided by a measuring shift, and simultaneously popping up horizontal lines on three pier columns by using an ink fountain; S1.2, hoisting anchor clamps, namely, hoisting lower half anchor clamps of three pier studs to the lower part of the installation position respectively by matching automobile cranes, wherein cotton yarns or rubber sheets are used for protecting pier stud concrete during hoisting; s1.3, preliminary installation, namely temporarily positioning a lower half anchor ear, and then hoisting an upper half anchor ear by a crane, wherein about 1/3 high-strength bolts are penetrated and are not screwed up temporarily, so that the anchor ear can slightly slide on a pier column; S1.4, accurate positioning and fastening: S1.4.1, adjusting the position of the anchor ear to align the bottom edge of the anchor ear with the ink line; S1.4.2, primary screwing of high-strength bolts, namely, primary screwing of all the high-strength bolts is carried out by using an electric spanner according to the sequence from the middle to two ends in a symmetrical and alternative manner, so that the uniform adhesion of the anchor ear panel and the surface of the pier stud is ensured; S1.4.3, final screwing of the high-strength bolt, namely using a calibrated torque wrench to screw the high-strength bolt to a designed pretension value for 2-3 times according to the same sequence, and marking the bolt and the nut with red paint after the final screwing is finished to prevent missing screwing and loosening; S2, installing an operation platform and a diagonal brace: s2.1, installing a platform, namely erecting a steel structure operation platform on the bracket of the lower anchor ear, wherein the platform needs to be fully paved with scaffold boards, and a protective railing not lower than 1.2 meters is arranged; S2.2, installing the diagonal braces, namely reliably connecting the lower ends of the diagonal braces with a preset connecting plate of a lower hoop platform, temporarily fixing the upper ends of the diagonal braces, and connecting the diagonal braces after the bearing main beams are in place; S3, positioning and installing an upper anchor ear, namely repeating the step S1, and placing the unloading block on an upper anchor ear bracket after the upper anchor ear is installed; s4, hoisting the bearing main beam: S4.1, assembling the main beams, namely connecting two sections of main beams into a whole by using a bolting and lacing plate; S4.2, main beam test hanging, namely selecting a proper hanging point by an automobile crane, slowly hanging a single bearing main beam from the ground by 0.5 m, standing for 5 minutes, and checking the stability of a lifting rigging and the main beam; S4.3, lifting the main beams to the upper part of the anchor ear stably, lifting the two main beams of the triple pier synchronously, ensuring that the axes of the two main beams are parallel and the elevations are consistent when in position, lifting the main beams to a designated position, slowly hooking the main beams, and accurately placing the main beams on a landing block; S5, installing a distribution beam: s5.1, stably placing, namely sequentially hoisting from the middle of each span to two ends, slowly hoisting a single distribution beam to the position above a designated position, and vertically and stably placing down to ensure that the two ends of the single distribution beam are contacted with the main beam; S5.2, reliably connecting the lower flange of the distribution beam with the upper flange of the bearing main beam by using bolts through a pressing plate; s6, installing a cover beam bottom die: s6.1, paving a bottom die, namely paving a capping beam bottom die plate on the distribution beam, and adjusting the center line, elevation and flatness of the capping beam bottom die plate to design values; s6.2, pre-pressing, namely pre-pressing the bracket to eliminate inelastic deformation and check the safety if required by design or scheme, wherein the pre-pressing load is usually 1.1 times of the weight of the bent cap; the disassembly method comprises the following steps: T1, removing the side forms, namely removing the side forms preferentially after the concrete strength reaches the standard, so that space is reserved for subsequent operation; The left sliding block and the right sliding block synchronously and slowly translate to two sides by loosening a split screw rod of the unloading block, so that each point of the bracket is ensured to synchronously and stably descend; T3, dismantling the distribution beams, namely dismantling the connection bolts and the pressing plates of the distribution beams and the bearing main beams in sequence from the middle to the two ends, removing the backing plates, and then extracting and lifting the distribution beams one by one; T4, dismantling the diagonal bracing, namely firstly dismantling the connection between the diagonal bracing and the bearing main beam, and then dismantling the connection between the diagonal bracing and the lower anchor ear platform to ensure auxiliary hanging to prevent instability; t5, dismantling the bearing main beam, namely dismantling a bolting and lacing plate between two sections of main beams, after the automobile crane gives a slight upward force to the main beams, removing the connection between the main beams and the anchor ear, and then commanding the crane to stably hoist the main beams; T6, dismantling the upper anchor ear, namely, after the unloading block is removed, using a calibrated torque wrench to loosen high-strength bolts of the anchor ear strictly in reverse order, namely, opposite to the installation order, and hanging a sling by using an automobile, and hanging the upper half anchor ear from the pier column after the bolts are completely removed; T7, dismantling the lower anchor ear, namely repeating the same flow, namely loosening the high-strength bolts in reverse order by using a torque wrench, and then hanging the lower half anchor ear away by using an automobile crane; and T8, cleaning and maintaining, namely transferring all the removed components to a designated site, cleaning dirt in time, checking the integrity, and sorting and stacking after maintenance for proper storage.

Description

Double-hoop bracket system for triple pier capping beam and mounting and dismounting method thereof Technical Field The invention relates to the technical field of bridge engineering construction, in particular to a double-hoop bracket system for a triple pier capping beam and an installing and detaching method thereof. Background In bridge engineering construction such as highway, railway, the capping beam is used as a key member for connecting pier columns and supporting an upper structure, and the construction quality of the capping beam is directly related to the overall safety and durability of a bridge. The triple pier capping beam has large span and heavy load, and has higher requirements on the safety, stability and economy of a construction bracket system. The traditional bent cap construction method mainly comprises a full framing method, an embedded part method, a single anchor ear method and the like. The full framing method needs to set up a large number of steel pipe supports on the ground, and the full framing method not only occupies a large area, consumes a large amount of materials and has long construction period, but also has high requirements on the bearing capacity of the foundation, and has poor applicability when crossing soft foundations, river courses or existing roads. The embedded part method needs to preset corbels or holes in the pier stud, so that the integrity of the pier stud concrete can be damaged, the embedded part is high in precision requirement, the later repair is troublesome, and the structural durability is potentially adversely affected. The single anchor ear method avoids part of the defects of a full framing and an embedded part, but has single supporting point, has the risks of limited bearing capacity and insufficient stability for a large-span and large-tonnage triple pier capping beam, and becomes a key constraint factor whether the friction force between the anchor ear and the pier column is reliable or not when bearing a huge load. With the development of bridge construction to large span and heavy duty, the limitation of the traditional method is increasingly prominent. Therefore, research and development of a novel bracket system which can provide enough bearing capacity and stability without damaging a pier column structure, has good adaptability, can be repeatedly used and is convenient to install, and becomes a technical problem to be solved in the field of bridge construction. The double-hoop bracket system is generated under the background, aims to overcome the defects of the prior art, and provides a safe, efficient and economic solution for the construction of triple piers and similar large-scale bent caps. The construction bracket system with the diagonal bracing double-hoop bent cap, which is proposed by the Chinese patent with the publication number of CN 118127933A, adopts the structural form of a two-linkage pier hoop bracket, and has certain limitation in practical application. Firstly, the design aims at a two-pier structure, the load transmission and the structural adaptation of the two-pier structure are optimized around double mopeds, and the two-pier structure cannot be expanded to a three-pier structure or more, so that the two-pier structure cannot be directly applied when meeting the working condition of the three-pier in bridge engineering, and the application range of the two-pier structure is limited. Secondly, the system does not integrate a special operation platform, and constructors lack stable and safe operation space when installing and dismantling the anchor ear and adjusting the lifting and dropping block, so that not only is the operation efficiency influenced, but also the risk of high-altitude operation is increased, and particularly in key working procedures such as anchor ear fastening and dropping block precision adjustment, the overall stability and the construction quality of the support are not likely to be further influenced by operation. Disclosure of Invention Aiming at the problems that a full framing method in the prior art has high requirements on a foundation, more material consumption and long construction period, an embedded part method damages the concrete integrity of pier columns, and a single anchor ear method is insufficient in bearing capacity and poor in stability when used for a large-span triple pier capping beam, the invention provides a double anchor ear bracket system for the triple pier capping beam and a construction method thereof. The system aims at providing a bracket solution with high bearing capacity, good overall stability, convenient installation and disassembly, reusability and high safety on the premise of not damaging the pier stud. In order to achieve the above purpose, the invention adopts the following technical scheme: A double clasping bracket system for a triple pier capping beam comprising: The bearing system consists of a bearing girder erected on the pier column and a dist