Sliding assembly type steel jacket box structure for first-aid repair reinforcement engineering and construction method

Abstract

The invention relates to a sliding assembly type steel jacket box structure for first-aid repair reinforcement engineering and a construction method, and belongs to the technical field of bridge construction.A hanging system and a side formwork structure are connected with a hanging bracket, the side formwork structure and the hanging bracket jointly form a steel jacket box stress frame, and a bottom plate structure is arranged at the bottom of the steel jacket box stress frame; the hanging system and the bottom plate structure are welded in an equal-strength mode, the hanging bracket, the side formwork structure and the bottom plate structure form an integral stress system, water stopping is conducted on the bottom plate structure of the integral stress system formed by the hanging bracket, the side formwork structure and the bottom plate structure through the water stopping wall plate, and therefore the novel sliding assembly type steel jacket box structure is designed. The problems that in the prior art, the surrounding space of a bearing platform of an existing bridge is usually limited, an integrally-spliced steel jacket box is large in size and possibly cannot be integrally assembled on site, it cannot be ensured that the steel jacket box is tightly attached to the bottom of the existing bearing platform, cofferdam construction cannot be smoothly implemented, and the whole project progress is affected are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a sliding assembled steel casing structure and a construction method for emergency repair and reinforcement engineering. Background Art

[0002] In the construction of bridge pier emergency repair and reinforcement projects, since bridges are important transportation hubs, demolition and reconstruction will affect the normal operation of traffic flow for a long time. Therefore, existing bridges are usually used for reinforcement. Construction can be carried out while ensuring basic smooth traffic, reducing the impact on surrounding traffic.

[0003] However, there are some problems in the current construction process of bridge pier repair and reinforcement projects: since the space around the pier of an existing bridge is often limited, especially in rivers, waterways or busy traffic arteries, and the traditional integral steel casing is large in size, it may not be possible to assemble it as a whole on site, and it is also impossible to ensure a close fit with the bottom of the existing pier, which will make it impossible to smoothly implement the cofferdam construction and affect the progress of the entire project. Therefore, in order to ensure that the existing pier is not damaged before constructing a new pier on the outside, the present invention proposes a sliding assembled steel casing structure and a construction method thereof. Summary of the invention

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a sliding assembled steel casing structure and a construction method for emergency repair and reinforcement projects, which solves the problem that the space around the pier of the existing bridge in the prior art is often limited, the size of the assembled steel casing is large, and it may not be possible to assemble it as a whole on site, and it is also impossible to ensure a close fit with the bottom of the existing pier, which will lead to the inability to smoothly implement the cofferdam construction and affect the progress of the entire project.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A sliding assembled steel casing structure for emergency repair and reinforcement engineering, comprising a hanger, a hanging system, a side formwork structure, a bottom plate structure and a waterproof wall plate for waterproofing the bottom plate structure of the steel casing, the hanging system and the side formwork structure are both connected to the hanger, the side formwork structure and the hanger together constitute a steel casing force frame, the bottom plate structure is arranged at the bottom of the steel casing force frame, the hanging system and the bottom plate structure are welded with equal strength, the hanger, the side formwork structure and the bottom plate structure form an integral force system, and the waterproof wall plate is used to waterproof the bottom plate structure in which the hanger, the side formwork structure and the bottom plate structure form an integral force system.

[0007] As a further solution of the present invention, a steel pipe column is arranged inside the hanger, and the steel pipe column is supported on the existing pedestal. An upper crossbeam is erected above the steel pipe column, and the upper crossbeam and the steel pipe column are connected by equal strength welding. A lower crossbeam connected to the upper crossbeam is arranged below the upper crossbeam, a sliding beam and a limiting steel are arranged on the top of the lower crossbeam, and scissors struts are arranged at both ends of the upper crossbeam and the lower crossbeam to ensure the overall stability of the hanger structure.

[0008] As a further solution of the present invention, both ends of the upper crossbeam are respectively provided with precision-rolled threaded steel hangers, and the upper crossbeam is connected to the lower crossbeam through the precision-rolled threaded steel hangers.

[0009] As a further solution of the present invention, the bottom plate structure includes a bottom plate main beam, bottom plate secondary beams respectively arranged on both sides of the bottom plate main beam, bottom plate stiffening ribs and bottom plate panels. The bottom plate main beam and the bottom plate secondary beam are connected by the bottom plate stiffening ribs, and the bottom plate panel is arranged above the bottom plate main beam, the bottom plate secondary beam and the bottom plate stiffening ribs to form a planar part of the bottom plate.

[0010] As a further solution of the present invention, the hanging system includes a cantilever beam, a steel hanger rod, a casing guide device and an internal support for connecting the intermediate segments. A steel casing is arranged on the steel casing. The cantilever beam is arranged on the supporting corbel at the top of the steel casing. The cantilever beam is strongly welded to the bottom plate main beam through the steel hanger rod. The casing guide device is arranged inside the two circular end segments of the steel casing. The casing guide device is used to prevent collision and dislocation between the steel casing and the steel casing.

[0011] As a further solution of the present invention, the side formwork structure includes an annular main beam, an annular secondary beam, a vertical main beam, a connecting vessel, a wall splicing channel steel and a side steel plate. The annular secondary beam is arranged between the annular main beams, and the vertical main beam is arranged perpendicular to the annular main beam and the annular secondary beam. The annular main beam, the annular secondary beam and the vertical main beam together constitute a side formwork force frame. The connecting vessel is arranged on the inner and outer sides of the side steel plate, the wall splicing channel steel is located on the inner side of the side steel plate, and the wall splicing channel steel is used to connect each wall segment.

[0012] A construction method of a sliding assembled steel casing for emergency repair and reinforcement engineering comprises the following steps:

[0013] S1: The components of the sliding assembled steel casing are processed and manufactured in the back field, transported to the bridge location, and the hanging system is pre-installed inside the circular end segments on both sides of the sliding assembled steel casing to facilitate the subsequent lowering and support force conversion;

[0014] S2: Plant reinforcement and set up hangers at the designated position on the top surface of the existing cap. When installing the hangers, pay attention to leaving enough space between the top surface of the lower beam and the bottom surface of the existing cap so that the middle section of the subsequent sliding assembly steel casing can slide inward into place;

[0015] S3: Use a floating crane to hoist the middle section of the sliding assembled steel casing to the designated location;

[0016] S4: Use a floating crane to slide the middle segment transversely, with the front lifting point 10 cm away from the edge of the beam. After the segment is moved to the right position, lower it to the contact sliding beam, then unhook the front lifting point and install the guide chain. The front segment uses the guide chain and the rear segment uses the floating crane to move the middle segment transversely until the rear lifting point is 10 cm away from the outer edge of the upper and lower beams, unhook the rear lifting point, and finally slide the segment to the designed position using the guide chain. Repeat the above steps in sequence until all the middle segments are slid into place, and the underwater alignment and splicing between the segments and the internal support between the opposite side segments are completed;

[0017] S5: Release the scissor brace connection of the lower beam, use the jack set on the upper beam to lift the middle section of the sliding assembled steel casing and the lower beam as a whole to the designed elevation, and re-weld the scissor brace after lifting into place;

[0018] S6: Use a floating crane to hoist the round end segments on both sides of the sliding assembled steel casing to the designated position;

[0019] S7: Move the round end segments on both sides of the cross bridge inward to the designed position, slowly lift them to the designed elevation, and fit them tightly with the bottom surface of the existing pedestal through the bottom water stop wall plate, and connect them with the installed sliding assembly steel casing middle segment, and pad the top of the steel casing to set up the supporting cantilever beam, and repeat the above steps in sequence until all the round end segments on both sides are installed;

[0020] S8: Check the joints of the sliding assembled steel casing and perform water-stopping treatment on the gap at the bottom edge of the steel casing. The sliding assembly installation of the steel casing is completed.

[0021] As a further solution of the present invention, the installation order of the hanger in S2 is steel pipe column, upper beam, precision-rolled threaded steel hanger and lower beam. When the water level is low, the sliding beam and limiting steel are installed underwater. After the hanger is installed, scissors braces are added to the ends of the upper beam and the lower beam.

[0022] As a further solution of the present invention, in S5, the scissors brace connection of the lower beam is released, and the upper beam is used to set a jack to lift the middle section of the sliding assembled steel casing and the lower beam as a whole to the designed elevation. The lifting speed should not be too fast, and the lifting of the jacks at each corner point must be synchronized. After lifting into place, the scissors brace is re-welded.

[0023] As a further solution of the present invention, when the waterstop wall plate is used to perform waterstop treatment on the inner edge of the steel casing bottom plate in S7, a small groove is locally made in the concrete at the bottom of the pedestal and the waterstop wall plate is embedded, or detailed waterstop treatment is performed on the edge gap of the waterstop wall plate to ensure that it plays a role in isolating the internal and external water flows at the junction of the steel casing bottom plate.

[0024] The beneficial effects of the present invention are:

[0025] By connecting the hanging system and the side formwork structure to the hanger, the side formwork structure and the hanger together form a steel box load-bearing frame, the bottom plate structure is arranged at the bottom of the steel box load-bearing frame, and the hanging system and the bottom plate structure are welded with equal strength. The hanger, the side formwork structure and the bottom plate structure form an overall force system, and the bottom plate structure that forms the overall force system of the hanger, the side formwork structure and the bottom plate structure is waterproofed by the water-stop wall plate. In this way, a new sliding assembly type steel box structure is designed, which solves the problem that the space around the pier of the existing bridge in the prior art is often limited, the size of the whole steel box is large, and it may not be possible to assemble it as a whole on site, and it is also impossible to ensure a close fit with the bottom of the existing pier, which will lead to the inability to smoothly implement the cofferdam construction and affect the progress of the entire project. The structure is simple in design, the force is clear, and it is easy to be processed and manufactured in the back field and to be installed by sliding assembly on site. It is particularly suitable for the construction of bridge pier repair and reinforcement projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0027] Figure 1 This is an elevation view of the sliding assembly type steel casing of the present invention;

[0028] Figure 2 It is a cross-sectional view of the sliding assembled steel casing 1-1 of the present invention;

[0029] Figure 3 It is a cross-sectional view of the sliding assembled steel casing 2-2 of the present invention;

[0030] Figure 4 It is a plan view of the sliding assembly type steel casing of the present invention;

[0031] Figure 5 It is a three-dimensional schematic diagram of the middle section of the sliding assembly type steel casing of the present invention;

[0032] Figure 6 It is a three-dimensional schematic diagram of the round end segments on both sides of the sliding assembly steel casing of the present invention;

[0033] Figure 7 It is a three-dimensional schematic diagram of the assembled segments of the sliding assembled steel casing of the present invention;

[0034] Figure 8 It is an overall three-dimensional oblique view of the sliding assembly type steel casing of the present invention;

[0035] Fig. 9 It is an overall three-dimensional top view of the sliding assembled steel casing of the present invention.

[0036] Description of main component symbols:

[0037] In the figure: 1. hanger; 101. steel pipe column; 102. upper crossbeam; 103. lower crossbeam; 104. limit steel; 105. precision-rolled threaded steel hanger; 106. scissors support; 107. sliding guide device; 108. sliding beam; 2. hanging system; 201. cantilever beam; 202. steel hanger; 203. casing guide device; 204. inner support; 3. side formwork structure; 301. annular main beam; 302. annular secondary beam; 303. vertical main beam; 304. connecting vessel; 305. wall splicing channel steel; 306. side steel plate; 4. bottom plate structure; 401. bottom plate main beam; 402. bottom plate secondary beam; 403. bottom plate stiffening rib; 404. bottom plate panel; 5. water stop wall plate. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0039] See also Figure 1 - Fig. 9 The present embodiment provides a sliding assembly type steel casing structure for emergency repair and reinforcement engineering, including a hanger 1, a hanging system 2, a side formwork structure 3, a bottom plate structure 4 and a waterproof wall plate 5 for waterproofing the bottom plate structure 4 of the steel casing. The hanging system 2 and the side formwork structure 3 are both connected to the hanger 1, and the side formwork structure 3 and the hanger 1 together constitute a steel casing force frame. The bottom plate structure 4 is arranged at the bottom of the steel casing force frame. The hanging system 2 and the bottom plate structure 4 are welded with equal strength. The hanger 1 and the side formwork structure 3 are connected to the hanger 1. The side formwork structure 3 and the hanger 1 together constitute a steel casing force frame. The bottom plate structure 4 is arranged at the bottom of the steel casing force frame. The waterstop wall plate 5 forms an integral force system with the bottom plate structure 4, and is used to waterstop the bottom plate structure 4 which is an integral force system formed by the hanger 1, the side formwork structure 3 and the bottom plate structure 4. The hanger 1 is the main force-bearing supporting component of the middle segment of the sliding assembled steel casing, and the hanging system 2 is the main force-bearing supporting component of the circular end segments on both sides. The waterstop wall plate 5 is used to waterstop the inner edge of the steel casing bottom plate, and can be embedded in a small local opening of the bottom plate concrete, or the edge gap of the waterstop wall plate 5 can be subjected to detailed waterstopping treatment.

[0040] At present, in the construction of emergency repair and reinforcement projects of bridge piers, the space around the piers of existing bridges is often limited, especially in rivers, waterways or busy traffic arteries. The size of traditional integral steel casings is large, and it may not be possible to assemble them as a whole on site, nor can they ensure a close fit with the bottom of the existing pier. This will make it impossible to smoothly implement the cofferdam construction and affect the progress of the entire project.

[0041] In order to solve the above problems, in this embodiment, the hanging system 2 and the side formwork structure 3 are connected to the hanger 1, the side formwork structure 3 and the hanger 1 together constitute a steel box force frame, the bottom plate structure 4 is arranged at the bottom of the steel box force frame, the hanging system 2 and the bottom plate structure 4 are welded with equal strength, the hanger 1, the side formwork structure 3 and the bottom plate structure 4 form an integral force system, and the bottom plate structure 4 that forms the overall force system of the hanger 1, the side formwork structure 3 and the bottom plate structure 4 is waterproofed by the water-stop wall plate 5, thereby designing a new sliding assembled steel box structure, which solves the problem that the space around the pier of the existing bridge in the prior art is often limited, the size of the assembled steel box is large, and it may not be possible to assemble it as a whole on site, and it is also impossible to ensure a close fit with the bottom of the existing pier, which will lead to the inability to smoothly implement the cofferdam construction and affect the progress of the entire project.

[0042] In order to quickly complete the construction of the sliding assembled steel casing structure, ensure the stability of the structure during the construction process, and improve the construction safety, in this regard, in one embodiment, the hanger 1 is the main force-bearing support component of the middle section of the sliding assembled steel casing, and a steel pipe column 101 is arranged inside it to be supported on the existing pedestal. The steel pipe column 101 is the main force-bearing support component of the hanger 1, and an upper crossbeam 102 is arranged above the steel pipe column 101. The upper crossbeam 102 and the steel pipe column 101 are connected by equal strength welding, and a lower crossbeam 103 connected to the upper crossbeam 102 is arranged below the upper crossbeam 102. Among them, fine-rolled threaded steel hangers 105 are respectively arranged at both ends of the upper crossbeam 102, and the upper crossbeam 102 is connected to the lower crossbeam 103 through the fine-rolled threaded steel hanger 105. In order to ensure the smooth sliding of the segment and the limitation of the segment during the sliding process, a sliding beam 108 and a limiting steel 104 are respectively arranged on the top of the lower crossbeam 103, and scissor braces 106 are arranged at both ends of the upper crossbeam 102 and the lower crossbeam 103 to ensure the overall stability of the hanger 1 structure. The structure can be quickly built through sliding assembly. In addition, through modular design, it can adapt to the needs of different projects.

[0043] In order to ensure the smooth pouring of the foundation concrete at a later stage, in one embodiment, the bottom plate structure 4 includes a bottom plate main beam 401, bottom plate secondary beams 402 respectively arranged on both sides of the bottom plate main beam 401, bottom plate stiffening ribs 403 and bottom plate panels 404. The bottom plate main beam 401 and the bottom plate secondary beam 402 are connected by the bottom plate stiffening ribs 403, and the bottom plate panels 404 are arranged above the bottom plate main beam 401, the bottom plate secondary beam 402 and the bottom plate stiffening ribs 403 to form a flat part of the bottom plate. This structure ensures the smooth pouring of the foundation concrete at a later stage.

[0044] During the construction process, the collision and dislocation between the steel casing and the steel casing may cause structural damage or construction accidents. Therefore, it is necessary to ensure that the structure has sufficient stability. In one embodiment, the hanging system 2 includes a cantilever beam 201, a steel hanger rod 202, a casing guide device 203 and an inner support 204. The steel casing is provided with a steel casing. The cantilever beam 201 is arranged on the supporting corbel at the top of the steel casing. The cantilever beam 201 is strongly welded with the bottom plate main beam 401 through the steel hanger rod 202. The casing guide device 203 is arranged inside the two circular end segments of the steel casing, and the casing guide device 203 is arranged inside the circular end segments on both sides to ensure the smooth alignment and lowering of the segments to avoid collision and dislocation between the steel casing and the steel casing during the lowering process. The inner support 204 is used to connect the middle segment on the opposite side to ensure the overall stability of the interior of the sliding assembly steel casing. In addition, through the sliding assembly design, it can be quickly assembled and put into emergency repair work, reducing the interruption time, improving the construction efficiency, and ensuring the safety of workers and equipment during the construction process.

[0045] Continuing from the previous embodiment, the side formwork structure 3 includes an annular main beam 301, an annular secondary beam 302, a vertical main beam 303, a connecting vessel 304, a wall splicing channel steel 305 and a side steel plate 306. The annular secondary beam 302 is arranged between the annular main beams 301, and the vertical main beam 303 is arranged perpendicular to the annular main beam 301 and the annular secondary beam 302. The annular main beam 301, the annular secondary beam 302 and the vertical main beam 303 together constitute a side formwork force frame. The connecting vessel 304 is arranged on the inner and outer sides of the side steel plate 306, and the wall splicing channel steel 305 is located on the inner side of the side steel plate 306. The wall splicing channel steel 305 is used to connect each wall segment. The connecting vessel 304 mainly plays a role in controlling the internal and external water flow. The wall splicing channel steel 305 mainly It plays a role in ensuring the mutual alignment and splicing between the wall segments. The side steel plate 306 mainly plays the role of blocking water and ensuring the effective internal construction space. Due to the sliding assembly design, the assembly speed of the structure is greatly improved, and the emergency repair and reinforcement work can be quickly completed in an emergency, reducing the interruption time of the project and improving the construction efficiency. The annular main beam 301, the annular secondary beam 302 and the vertical main beam 303 together form a stable force-bearing frame, which enhances the overall stability and bearing capacity of the structure and ensures the safety during the construction process. The setting of the wall splicing channel steel 305 and the connecting vessel 304 enables the precise alignment and splicing between the wall segments, improves the overall rigidity and sealing of the structure, and reduces the potential water penetration problem;

[0046] In addition, the design of the communicating vessel 304 effectively controls the internal and external water flows, avoids structural damage caused by water impact, and also reduces water accumulation in the internal space, ensuring a dry construction environment. The design of the side steel plate 306 plays a good water-blocking role, reduces water erosion on the interior of the structure, ensures the dryness of the internal space, and extends the service life of the structure. The side steel plate 306 ensures that there is enough construction space inside, provides a safe and comfortable working environment for construction personnel, and improves construction quality. Due to the reasonable structural design, the use of materials and construction time are reduced, thereby reducing the overall cost of the project. The structural design has good adaptability and can be adjusted according to different engineering requirements. It is suitable for various types of emergency repair and reinforcement projects.

[0047] It should be noted that the hanger 1 is the main load-bearing support member of the middle section of the sliding assembly steel casing, and a steel pipe column 101 is arranged inside the hanger 1 to support the existing pedestal. The hanging system 2 is the main load-bearing support member of the circular end sections on both sides, and is directly erected on the supporting brackets on the top of the steel casing through the cantilever beam 201. The hanging system 2 is connected to the hanger 1 through the steel hanger rod 202 and the upper crossbeam 102 to ensure the stability of the circular end sections on both sides. The upper crossbeam 102 of the hanger 1 is connected to the annular main beam 301, the annular secondary beam 302 and the vertical main beam 303 of the side formwork structure 3, and together constitutes the overall load-bearing frame of the steel casing. The cantilever beam 201 of the hanging system 2 is welded to the bottom plate main beam 401 of the bottom of the casing through the steel hanger rod 202 to ensure the stable connection between the hanging system 2 and the side formwork structure 3. The annular main beam 301, annular secondary beam 302 and vertical main beam 303 of the side formwork structure 3 are connected with the main beam and secondary beam of the bottom plate structure 4 to form an overall force system. The bottom plate main beam 401, bottom plate secondary beam 402, bottom plate stiffening rib 403 and bottom plate panel 404 of the bottom plate structure 4 constitute the force supporting structure of the bottom of the steel casing. The water stop wall plate 5 fits tightly with the bottom plate panel 404, and the water flow inside and outside the junction of the bottom plate of the steel casing is isolated.

[0048] A construction method of a sliding assembled steel casing for emergency repair and reinforcement engineering comprises the following steps:

[0049] S1: According to the design and assembly requirements of the steel casing, the components required for each assembly are processed and manufactured by the back-end. After processing and manufacturing, they are transported to the bridge location. The processing accuracy of each component must meet the design requirements, and the welding process requirements must meet the national standards. The components must be inside the circular end segments on both sides of the sliding assembly steel casing, such as Figure 6As shown, the hanging system 2 (including the cantilever beam 201, the steel hanger rod 202 and the casing guide device 203) is pre-installed and set up so that the supporting force conversion can be completed later by lowering; the sliding assembly type steel casing is designed, and the components required for each assembly can be pre-processed and manufactured in the factory, so that factory production can be realized, the processing accuracy and construction efficiency of the components can be improved, and only assembly is required on site, which reduces the complexity and time consumption of on-site construction. In addition, the pre-installation of the hanging system 2 can reduce the impact on other structures on site during the construction process, and the supporting force conversion is more convenient and safe, which reduces the risks in the construction, improves the structural stability in the construction process, avoids the complexity and instability of the temporary support structure, is convenient for construction personnel to operate, and reduces interference in the construction process;

[0050] S2: Plant reinforcement and set hanger 1 at the designated position on the top surface of the existing pedestal. When installing hanger 1, pay attention to leaving enough space between the top surface of the lower beam 103 and the bottom surface of the existing pedestal (the lower beam 103 is 20cm lower than the design elevation) so that the middle section of the sliding assembly steel casing can slide inwards and be lifted to the designated position by floating crane. Figure 5 As shown, the segment cross-bridge is 50 cm away from the outer edge of the upper beam 102 and the lower beam 103, and the bottom of the segment is 30 cm away from the top surface of the sliding beam 108. After being hoisted in place, it is waiting for sliding. The installation sequence of the hanger 1 is steel pipe column 101, upper beam 102, precision-rolled threaded steel hanger rod 105 and lower beam 103. When the water level is low, the sliding beam 108 and the limiting steel 104 are installed underwater. After the installation of the hanger 1 is completed, scissor braces 106 are added to the ends of the upper beam 102 and the lower beam 103. Sufficient spacing is left between the top surface of the lower beam 103 and the bottom surface of the existing pedestal (the lower beam 103 is 20 cm lower than the design elevation), which can ensure During the sliding process of the steel casing, it will not collide with the bottom of the pedestal, reducing the construction risk. Through precise hoisting and positioning, it is ensured that the middle section of the sliding assembled steel casing can slide into place smoothly, avoiding deviations during the construction process, improving construction safety, leaving enough space, and facilitating subsequent construction operations, such as the installation and adjustment of the sliding assembled steel casing. By planting reinforcement on the top surface of the existing pedestal and setting a hanger 1, the interference with the existing structure can be minimized and the stability of the structure can be maintained. The design of the sliding assembled steel casing allows segmented construction, and each component can be prefabricated separately and quickly assembled on site, greatly improving construction efficiency.

[0051] S3: Use a floating crane to hoist the middle section of the sliding assembled steel casing to the designated location;

[0052] S4: Use a floating crane to slide the middle segment transversely, where the front suspension point is 10 cm away from the edge of the beam. After the segment is moved to the right position, lower the segment to the contact sliding beam 108, then unhook the front suspension point and install the guide chain. The front segment uses the guide chain and the rear segment uses the floating crane. The wall slides along the sliding guide device 107. When the middle segment moves to the rear suspension point 10 cm away from the outer edge of the upper and lower beams 103, unhook the rear suspension point, and finally slide the segment to the designed position using the guide chain. Repeat the above steps in sequence until all the middle segments are slid into place, and the underwater alignment and splicing between the segments and the internal support 204 between the opposite side segments are completed.

[0053] S5: Release the connection between the lower crossbeam 103 and the scissor brace 106, and use the jacks set on the upper crossbeam 102 to lift the middle section of the sliding assembled steel casing and the lower crossbeam 103 to the designed elevation. The lifting speed should not be too fast, and the lifting of the jacks at each corner point must be synchronized. After lifting in place, re-weld the scissor brace 106. Figure 5 As shown;

[0054] S6: Use a floating crane to hoist the round-end segments on both sides of the sliding assembled steel casing to the designated position, where the center of the longitudinal bridge cantilever beam 201 is 50 cm horizontally away from the center of the steel casing, and the bottom surface of the cantilever beam 201 is 30 cm away from the top surface of the steel casing to avoid affecting the subsequent inward movement of the transverse bridge of the segment;

[0055] S7: Move the round end segments on both sides of the cross bridge inward to the designed position, slowly lift them to the designed elevation, and fit them tightly with the bottom water stop wall plate 5 to the bottom surface of the existing pedestal, and connect them to the middle segment of the installed sliding assembly steel casing, and pad the top of the steel casing to set up the supporting cantilever beam 201. Note that the pad must be flat to avoid uneven force on the cantilever beam 201. Repeat the above steps in sequence until all the round end segments on both sides are installed. Figure 6 As shown;

[0056] S8: Check the joints of the sliding assembled steel casing, perform water-stopping treatment on the gap at the bottom edge of the steel casing, use sealing plates to seal the circular end segments on both sides (the gap between the bottom plate and the steel casing) according to the design, and use long bags to fill the gap between the casing and the sealing plates. The sliding assembly and installation of the steel casing is completed. It should be noted that the above 50cm, 30cm, 20cm and 10cm are all values ​​designed according to the specific conditions and needs of the construction.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sliding assembly steel casing structure for emergency repair and reinforcement engineering, characterized in that: It includes a hanger, a hanging system, a side formwork structure, a bottom plate structure and a waterproof wall plate for waterproofing the bottom plate structure of the steel casing. The hanging system and the side formwork structure are both connected to the hanger, and the side formwork structure and the hanger together constitute a steel casing force frame. The bottom plate structure is arranged at the bottom of the steel casing force frame. The hanging system and the bottom plate structure are welded with equal strength. The hanger, the side formwork structure and the bottom plate structure form an integral force system. The waterproof wall plate is used to waterproof the bottom plate structure in which the hanger, the side formwork structure and the bottom plate structure form an integral force system.

2. The sliding assembly type steel casing structure for emergency repair and reinforcement engineering according to claim 1 is characterized in that: A steel pipe column is arranged inside the hanger, and the steel pipe column is supported on the existing pedestal. An upper crossbeam is arranged above the steel pipe column, and the upper crossbeam and the steel pipe column are connected by equal strength welding. A lower crossbeam connected to the upper crossbeam is arranged below the upper crossbeam, and a sliding beam and a limiting steel are arranged on the top of the lower crossbeam. Scissor braces are arranged at both ends of the upper crossbeam and the lower crossbeam to ensure the overall stability of the hanger structure.

3. The sliding assembly type steel casing structure for emergency repair and reinforcement engineering according to claim 2 is characterized in that: The two ends of the upper crossbeam are respectively provided with precision-rolled threaded steel hangers, and the upper crossbeam is connected to the lower crossbeam through the precision-rolled threaded steel hangers.

4. The sliding assembly type steel casing structure for emergency repair and reinforcement engineering according to claim 1 is characterized in that: The bottom plate structure includes a bottom plate main beam, bottom plate secondary beams respectively arranged on both sides of the bottom plate main beam, bottom plate stiffening ribs and a bottom plate panel. The bottom plate main beam and the bottom plate secondary beam are connected by the bottom plate stiffening ribs, and the bottom plate panel is arranged above the bottom plate main beam, the bottom plate secondary beam and the bottom plate stiffening ribs to form a plane part of the bottom plate.

5. The sliding assembly type steel casing structure for emergency repair and reinforcement engineering according to claim 4 is characterized in that: The hanging system includes a cantilever beam, a steel hanger rod, a casing guide device and an internal support for connecting the middle segments. A steel casing is arranged on the steel casing. The cantilever beam is arranged on the supporting corbel at the top of the steel casing. The cantilever beam is strongly welded to the bottom plate main beam through the steel hanger rod. The casing guide device is arranged inside the two circular end segments of the steel casing. The casing guide device is used to prevent collision and dislocation between the steel casing and the steel casing.

6. The sliding assembly type steel casing structure for emergency repair and reinforcement engineering according to claim 1 is characterized in that: The side formwork structure includes an annular main beam, an annular secondary beam, a vertical main beam, a connecting vessel, a wall splicing channel steel and a side steel plate. The annular secondary beam is arranged between the annular main beams, and the vertical main beam is arranged perpendicular to the annular main beam and the annular secondary beam. The annular main beam, the annular secondary beam and the vertical main beam together constitute a side formwork force frame. The connecting vessel is arranged on the inner and outer sides of the side steel plate. The wall splicing channel steel is located on the inner side of the side steel plate. The wall splicing channel steel is used to connect each wall segment.

7. A construction method of a sliding assembled steel casing for emergency repair and reinforcement engineering, based on a sliding assembled steel casing structure for emergency repair and reinforcement engineering as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: S1: The components of the sliding assembled steel casing are processed and manufactured in the back field, transported to the bridge location, and the hanging system is pre-installed inside the circular end segments on both sides of the sliding assembled steel casing to facilitate the subsequent lowering and support force conversion; S2: Plant reinforcement and set up hangers at the designated position on the top surface of the existing cap. When installing the hangers, pay attention to leaving enough space between the top surface of the lower beam and the bottom surface of the existing cap so that the middle section of the subsequent sliding assembly steel casing can slide inward into place; S3: Use a floating crane to hoist the middle section of the sliding assembled steel casing to the designated location; S4: Use a floating crane to slide the middle segment transversely, with the front lifting point 10 cm away from the edge of the beam. After the segment is moved to the right position, lower it to the contact sliding beam, then unhook the front lifting point and install the guide chain. Use the guide chain for the front section and the floating crane for the rear section to move the middle segment transversely until the rear lifting point is 10 cm away from the outer edge of the upper and lower beams, unhook the rear lifting point, and finally slide the segment to the designed position using the guide chain. Repeat the above steps in sequence until all the middle segments are slid into place, and the underwater alignment and splicing between the segments and the internal support between the opposite side segments are completed; S5: Release the scissor brace connection of the lower beam, use the jack set on the upper beam to lift the middle section of the sliding assembled steel casing and the lower beam as a whole to the designed elevation, and re-weld the scissor brace after lifting into place; S6: Use a floating crane to hoist the round end segments on both sides of the sliding assembled steel casing to the designated position; S7: Move the round end segments on both sides of the cross bridge inward to the designed position, slowly lift them to the designed elevation, and fit them tightly with the bottom surface of the existing pedestal through the bottom water stop wall plate, and connect them with the installed sliding assembly steel casing middle segment, and pad the top of the steel casing to set up the supporting cantilever beam, and repeat the above steps in sequence until all the round end segments on both sides are installed; S8: Check the joints of the sliding assembled steel casing and perform water-stopping treatment on the gap at the bottom edge of the steel casing. The sliding assembly installation of the steel casing is completed.

8. The sliding assembly type steel casing structure and construction method for emergency repair and reinforcement engineering according to claim 7 is characterized in that: The installation sequence of the hanger in S2 is steel pipe column, upper crossbeam, precision-rolled threaded steel hanger rod and lower crossbeam. When the water level is low, the sliding beam and limit steel are installed underwater. After the hanger is installed, scissor braces are added to the ends of the upper crossbeam and the lower crossbeam.

9. The sliding assembly type steel casing structure and construction method for emergency repair and reinforcement engineering according to claim 7 is characterized in that: In the above-mentioned S5, the scissors brace connection of the lower beam is released, and the middle section of the sliding assembled steel casing and the lower beam are lifted to the design elevation as a whole using the jacks set on the upper beam. The lifting speed should not be too fast, and the lifting of the jacks at each corner point must be synchronized. After lifting into place, the scissors brace is re-welded.

10. The sliding assembly type steel casing structure and construction method for emergency repair and reinforcement engineering according to claim 7, characterized in that: When the waterstop wall plate is used to perform waterstop treatment on the inner edge of the steel casing bottom plate in S7, a small groove is locally opened in the concrete at the bottom of the pedestal and the waterstop wall plate is embedded, or detailed waterstop treatment is performed on the edge gap of the waterstop wall plate to ensure that it plays a role in isolating the water flow inside and outside the junction of the steel casing bottom plate.

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