Bearing beam structure for adjusting steel box beam based on jack and construction method

Abstract

The invention discloses a spandrel girder structure for adjusting a steel box girder based on a jack and a construction method. The construction method comprises the following steps that S1, an embedded part is installed; s2, manufacturing a bearing beam; s3, installation of the operation platform; s4, the bearing beam is installed; s5, the bearing plate is mounted; s6, mounting a temporary support and a beam adjusting device; through the construction steps of the system, it is ensured that the bearing beam is accurately installed on the upper cross beam of the main tower, and the construction efficiency and quality are improved. Due to the accurate installation of the embedded parts and the reasonable connection of the components of the bearing beam, the overall stability and safety of the structure are ensured, and reliable support is provided for the jack to adjust the steel box beam. Due to the modular design of the spandrel girder, the spandrel girder can be quickly adjusted and reused according to actual requirements on site, and the flexibility and adaptability of construction are greatly improved; by means of segmented prefabrication and on-site assembly, the weight and the size of a single component are remarkably reduced, and carrying and mounting are more convenient and faster.

Description

Technical Field

[0001] The invention belongs to the technical field of load-bearing beams, and in particular relates to a load-bearing beam structure and a construction method for adjusting a steel box beam based on a jack. Background Art

[0002] As a core structural component of bridges and buildings, load-bearing beams ensure that the load can be evenly distributed to each support point through scientific and rigorous calculations and structural design, thereby avoiding potential damage to the structure due to load concentration, and significantly improving the overall stability and safety of the structure. Especially in the field of bridge construction, the main tower often involves the connection of two segmental steel box girders. For large steel box girders, temporary supports are required to bear the weight, and the linear shape of the steel box girder is finely adjusted with the help of jacks to ultimately ensure that it is firmly placed on the permanent pad stone. In this process, the load-bearing beam not only needs to have sufficient load-bearing capacity, but also needs to be able to accurately support the adjustment of the jack to ensure that the linear adjustment of the steel box girder achieves the expected effect.

[0003] However, the current load-bearing beam design on the market has obvious limitations. On the one hand, the traditional load-bearing beam design lacks sufficient flexibility and is difficult to quickly adjust and reuse according to the actual needs of the construction site, which to a certain extent limits the improvement of construction efficiency. On the other hand, most existing load-bearing beams are designed as large integrated fixed structures, which not only increases the difficulty of transportation, but also makes the installation process extremely complicated, increasing construction costs and time investment. In addition, when faced with the need to adjust the jacks of large-section steel box girders, traditional load-bearing beams are often difficult to provide sufficient support due to their limited force area, and may also face large lateral force challenges. These problems have greatly affected the construction quality and structural safety. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a load-bearing beam structure and construction method for adjusting steel box beams based on jacks, aiming to solve the shortcomings of traditional load-bearing beams at the cross beams on the main tower of the bridge in the application of jack adjustment beams.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is as follows: A construction method for adjusting a load-bearing beam for a steel box beam based on a jack comprises the following steps:

[0006] S1: Install embedded parts: make thin steel plate positioning parts, pre-drill holes on the thin steel plate, and place the thin steel plate at a predetermined position for fixing. The embedded parts adopt climbing cone embedded components, including climbing cones, high-strength screws, and embedded parts plates. The anchoring depth of the embedded parts is greater than or equal to 300 mm.

[0007] S2: Production of load-bearing beams: The load-bearing beams include two long longitudinal beams, a corbel beam, a short longitudinal beam and a short transverse beam. The corbel beam is fixed to the bottom of the long longitudinal beams and the short transverse beams. The long longitudinal beams are connected to the embedded components by bolts. The two ends of the short transverse beams are respectively vertically fixed to one end of the two long longitudinal beams, and the short longitudinal beams are vertically fixed to the short transverse beams. Ribs are added to reinforce the joints of the load-bearing parts. The height of each fillet weld leg is greater than or equal to 0.7 times the thickness of the adjacent plate.

[0008] S3: Installation of the operating platform: Use an ink line to pop out the beam positioning line on the corbel beam, weld the bracket to the beam on the operating platform in advance, lift the main frame of the operating platform to a suitable height, adjust the plane position to meet the requirements, and then weld and fix it;

[0009] S4: Installation of the load-bearing beam: The load-bearing beam is hoisted to the designed position in the order of the long longitudinal beam, the short longitudinal beam and the short transverse beam; the flatbed truck loads the components of the load-bearing beam to the main pier construction platform, and the crane hoists the load-bearing beam to the height of the lower transverse beam; the plane position of the components of the load-bearing beam is adjusted, and the alignment of the bolt holes of the load-bearing beam and the climbing cone holes and the fit between the thin steel plate and the lower transverse beam are checked one by one. After checking, the hook is lowered and unhooked. If there is a large deviation, the position is adjusted again;

[0010] S5: Installation of the support plate: Position the support plate using a hand hoist; connect the backing plate of the embedded parts and perform hole processing, and reserve an operation hole on the top plate;

[0011] S6: Installation of temporary support and beam adjustment device: hoist the three-way top and temporary support to the predetermined position by a crane, and fix them by welding, add ribs at the positions of the three-way top and temporary support, and add ribs inside the corresponding load-bearing beams.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention ensures the precise installation of the load-bearing beam at the crossbeam on the main tower through systematic construction steps, thereby improving the efficiency and quality of construction. The precise installation of embedded parts and the reasonable connection of the various components of the load-bearing beam ensure the overall stability and safety of the structure, and provide reliable support for the jack to adjust the steel box beam. The various components of the load-bearing beam can be pre-processed in the steel structure manufacturing plant and then transported to the site for assembly and welding. This modular design allows the load-bearing beam to be quickly adjusted and reused according to the actual needs of the site, greatly improving the flexibility and adaptability of the construction; through the method of segmented prefabrication and on-site assembly, the present invention significantly reduces the weight and volume of a single component, making it more convenient to transport and install, which not only reduces the dependence on large-scale machinery and equipment, but also reduces the construction cost, reduces the risk of high-altitude operations, and improves construction safety; the various components are connected by welding, and stiffening plates are provided for local reinforcement, ensuring the overall rigidity and strength of the structure. In particular, ribs are added to the load-bearing beams at the preset positions of the jacks and temporary supports, corresponding to the positions of the internal stiffening ribs of the steel box beams, thereby effectively expanding the force-bearing area, avoiding local stress concentration, and improving the bearing capacity and stability of the structure.

[0013] In the above construction method, the installation of embedded parts mentioned in step S1 mainly includes the following steps:

[0014] S11, counting the number of embedded parts installed and preparing finished products of qualified quality;

[0015] S12, processing the thin steel plate and accurately controlling the relative position relationship;

[0016] S13, on-site setting out, during the upper steel bar binding stage of the lower beam, the embedded parts are installed as a whole;

[0017] S14. During the concrete pouring process, closely observe the deviation of the embedded parts and correct them in time if there is any deviation;

[0018] S15. After the concrete is demoulded, the position of the embedded parts is re-measured in time, and the processing and manufacturing of the load-bearing beams are guided according to the deviations.

[0019] In the above-mentioned construction method, during the installation of the installation operation platform of the load-bearing beam mentioned in step S3, the upper platform is hoisted again and installed on the upper part of the upper crossbeam, and the upper platform is welded and fixed to the overlapping area of ​​the upper crossbeam and the side panel of the corbel beam.

[0020] In the above-mentioned construction method, during the installation of the load-bearing beam in step S4, before the installation of the load-bearing beam, the dust and oil stains at the installation position of the pier top are cleaned, and the outline of the load-bearing beam is popped out with an ink line. The ink line should exceed the bottom plate size by more than 10 mm to facilitate centering inspection.

[0021] In the above construction method, in the installation of the load-bearing beam in step S4, a high-strength bolt pair is used for initial positioning, and the various plates of the load-bearing beam are sealed and reinforced, and the load-bearing counterweight is installed.

[0022] In the above construction method, in step S4, the short longitudinal beam is connected to the main tower embedded part by bolts, and the long longitudinal beam, the short longitudinal beam, the short cross beam and the corbel beam are fixedly connected by welding.

[0023] In the above construction method, in step S5, the distance between the corbel beam and the embedded part is remeasured, and the size of the support plate is adjusted on site according to the deviation.

[0024] In the above construction method, in step S5, the positioning pins and temporary bolts are inserted into the bolt holes and the climbing cone holes of the support plate to temporarily fix them, and then the M36 high-strength bolt pairs are sequentially installed in the order of first the outside and then the inside.

[0025] In the above construction method, in step S5, the tightening of the high-strength bolt pair is divided into initial tightening and final tightening, and the initial tightening torque and the re-tightening torque are 50% of the final tightening torque.

[0026] In the above-mentioned construction method, in step S6, the hydraulic oil pipes and cables required for the three-way top and the control cabinet are laid out and protective measures are taken, the elevations of the temporary support and the top of the three-way top are remeasured and collected and compared with the designed bottom elevation of the steel box girder, and the number of pad layers is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of simplified steps of a construction method according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the step S1 of installing embedded parts in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the load-bearing beam structure of an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the main tower plan layout according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic plan view of the embedded parts of the supporting plate according to an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of an operating platform according to an embodiment of the present invention;

[0033] Explanation of the accompanying figures: 100 load-bearing beam, 110 long longitudinal beam, 120 short longitudinal beam, 130 short cross beam, 140 corbel beam, 200 operating platform, 210 toggle plate, 220 lower cross beam, 230 support plate, 300 three-way top, 400 counterweight block, 500 temporary support, 600 main tower load-bearing beam. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below. Figures 1 to 6 The embodiment of the present invention provides a load-bearing beam 100 structure and construction method for adjusting a steel box beam based on a jack, characterized in that the structure comprises the following steps: S1: installing embedded parts: making thin steel plate positioning parts, pre-drilling holes on the thin steel plate, placing the thin steel plate in a predetermined position and fixing it, the embedded parts adopt climbing cone type embedded components, including climbing cones, high-strength screws, and embedded parts plates, and the anchoring depth of the embedded parts is greater than or equal to 300mm; S2: making the load-bearing beam 100: the load-bearing beam 100 comprises two long longitudinal beams 110, a corbel beam 140, a short longitudinal beam 120 and a short cross beam 130, the corbel beam 140 is fixed to the bottom of the long longitudinal beam 110 and the short cross beam 130, the long longitudinal beam 110 is connected to the embedded components by bolts, the two ends of the short cross beam 130 are respectively vertically fixed to one end of the two long longitudinal beams 110, and the short longitudinal beam 120 is vertically fixed to the short cross beam 130; at each load-bearing part, Ribs are added to reinforce the joints of the components, and the height of each fillet weld is greater than or equal to 0.7 times the thickness of the adjacent plate; S3: Installation of the operating platform 200: Use an ink line to pop out the beam positioning line on the corbel beam 140, weld the toggle plate 210 to the upper beam of the operating platform 200 in advance, lift the main frame of the operating platform 200 to a suitable height, adjust the plane position to meet the requirements and then weld and fix; S4: Installation of the load-bearing beam 100: The load-bearing beam 100 is hoisted to the designed position in the order of the long longitudinal beam 110, the short longitudinal beam 120 and the short transverse beam 130; The flatbed truck loads the load-bearing beam 100 components to the main pier construction platform, and the crane lifts the load-bearing beam 100 to the height of the lower beam 220; Adjust the plane position of each component of the load-bearing beam 100, check the alignment of the bolt hole of the load-bearing beam 100 with the climbing cone hole and the fit between the thin steel plate and the lower beam 220 one by one, and lower and unhook after checking that they are correct. If there is a large deviation, re-lift and adjust the position; S5: Installation of the supporting plate 230: Re-measure the distance between the corbel beam 140 and the embedded parts at the bottom of the load-bearing beam 100, adjust the size of the supporting plate 230 on site according to the deviation, and use a hand hoist to position the supporting plate 230; connect the pads and open holes of the embedded parts, and reserve operating holes on the top plate; S6: Installation of temporary support and beam adjustment device: Use a crane to hoist the three-way top 300 and the temporary support 500 to the predetermined position, and fix them by welding, add ribs at the positions of the three-way top 300 and the temporary support 500, and add ribs inside the corresponding load-bearing beam 100.

[0035] Further, refer to Figure 2The installation of embedded parts mentioned in step S1 mainly includes the following steps: S11, counting the number of embedded parts installed and preparing finished products with qualified quality; S12, processing thin steel plates and accurately controlling the relative position relationship; S13, on-site layout, and simultaneous installation of embedded parts as a whole during the upper steel bar binding stage of the lower cross beam 220; S14, concrete pouring, closely observing the deviation of embedded parts during the process, and correcting them in time if there is any deviation; S15, after the concrete is demolded, timely re-measure the position of the embedded parts, and guide the processing and manufacturing of the load-bearing beam 100 according to the deviation. Furthermore, before the main tower load-bearing beam 100 is installed, the embedded parts must be installed after the steel bar construction of the lower cross beam 220 of the main tower is completed. During the installation, effective positioning measures such as thin steel plates are taken. According to the design position and size of the embedded parts, corresponding thin steel plate positioning parts are made. Holes are pre-opened on the positioning parts, and the size of the holes matches the bolt holes of the embedded parts. The thin steel plate positioning parts are accurately placed at the predetermined position to ensure that they are aligned with the steel bar holes. The thin steel plate positioning parts can be temporarily fixed to the steel bars using binding wires or other fixing devices to prevent them from moving during the concrete pouring process. Furthermore, during the concrete pouring process, a special person is arranged to monitor the position of the embedded parts in real time. Once displacement or tilting is found, measures are taken immediately to correct it. At the same time, when pouring concrete, a vibrating rod is used reasonably to avoid excessive impact force on the embedded parts, which causes them to shift. Furthermore, after the concrete is demolded, a measuring tool is used to re-measure the position of the embedded parts to ensure that they meet the design requirements. If there is any deviation, it should be corrected in time. Furthermore, in step S1, the thin steel plate positioning member ensures the precise positioning of the embedded parts, avoids displacement during the pouring of concrete, improves the installation accuracy of the embedded parts, and the use of the climbing cone embedded assembly ensures the stability and firmness of the embedded parts in the concrete. Of course, the present invention does not limit the anchoring depth of the embedded parts. Preferably, the anchoring depth is greater than or equal to 300mm. This design can enhance the pull-out resistance of the embedded parts and provide a reliable fixing point for the subsequent installation of the load-bearing beam 100. Furthermore, the present invention does not limit the specific connection method between the components of the load-bearing beam 100. Preferably, refer to Figure 3 The long longitudinal beam 110, the short longitudinal beam 120 and the embedded parts of the main tower are connected by bolts, and the long longitudinal beam 110, the short longitudinal beam 120, the short cross beam 130 and the corbel beam 140 and other components of the load-bearing beam 100 are fixedly connected by welding. This method ensures the overall rigidity and strength of the load-bearing beam 100. The present invention does not limit the height of the weld leg of each fillet weld. Preferably, the height of the weld leg of each fillet weld is greater than or equal to 0.7 times the thickness of the adjacent plate; for example, when the thickness of the corbel beam 140 plate is 1cm, the height of the fillet weld is greater than or equal to 7mm. This design can ensure that the weld connection strength is the best under the premise of the smallest weld, and can significantly increase the cross-sectional area of ​​the weld, thereby improving the load-bearing capacity of the weld, which is conducive to ensuring that the connection between the components of the load-bearing beam 100 is more firm and reducing the risk of fracture under high load.

[0036] Furthermore, in step S3: installation of the operating platform 200, the installation of the operating platform 200 provides a safe and stable working environment for the construction personnel, improving the convenience and efficiency of the construction; the crossbeam positioning line is popped out by the ink line, ensuring the precise alignment of the operating platform 200, avoiding installation errors, and improving the overall accuracy of the structure. Figure 6 , after the toggle plate 210 is welded and fixed, the upper platform is hoisted again and installed on the upper part of the upper beam, and the upper platform is welded and fixed to the overlapping area of ​​the upper beam and the side panel of the corbel beam 140. By installing the operating platform 200 in steps, the stability and safety of the operating platform 200 are ensured. Furthermore, in the installation of the load-bearing beam 100 in step S4, by checking the alignment of the bolt holes and the fit between the thin steel plate and the lower beam 220 one by one, the precise alignment of the components of the load-bearing beam 100 is ensured, and installation errors are avoided. The step-by-step hoisting and adjustment ensure the smooth installation of the components of the load-bearing beam 100, improve the construction efficiency, and reduce the risk of high-altitude operations. Furthermore, in the installation of the load-bearing beam 100 in step S4, before the load-bearing beam 100 is installed, the dust and oil stains at the installation position of the pier top are cleaned, and the outline of the load-bearing beam 100 is popped out with an ink line. The ink line should exceed the bottom plate size by more than 10 mm to facilitate centering inspection. Through the preparatory work, the cleanliness and accuracy of the installation position of the load-bearing beam 100 are ensured, and the outline is popped up with an ink line to facilitate the construction personnel to check the centering, thereby improving the accuracy and efficiency of the installation of the load-bearing beam 100 and avoiding rework due to position deviation. Furthermore, in the installation of the load-bearing beam 100 in step S4, a high-strength bolt pair is used for initial positioning, and the various plates of the load-bearing beam 100 are sealed and reinforced, and the weight-bearing counterweight block 400 is installed. The initial positioning of the high-strength bolt pair ensures the initial fixation of the various components of the load-bearing beam 100, avoiding displacement during the lifting process. The sealing and reinforcement treatment further enhances the overall rigidity and strength of the load-bearing beam 100, and the installation of the counterweight block 400 ensures the stability of the load-bearing beam 100 and improves the safety of the structure.

[0037] Further, refer to Figure 5In the installation of the support plate 230 in step S5, the accurate installation of the support plate 230 is ensured by retesting and on-site adjustment, avoiding installation problems caused by dimensional deviation. At the same time, the use of the hand hoist ensures the accurate positioning of the support plate 230, and the pad and hole processing provide convenience for subsequent operations, improving the efficiency and quality of construction. Furthermore, in step S5, the spacing between the corbel beam 140 and the embedded parts is retested, and the size of the support plate 230 is adjusted on-site according to the deviation. The accurate installation of the support plate 230 is ensured by retesting and on-site adjustment. The size adjustment and accurate installation of the support plate 230 avoid installation problems caused by dimensional deviation and improve the stability and safety of the load-bearing beam 100. Furthermore, in step S5, the locating pins and temporary bolts are inserted into the bolt holes and climbing cone holes of the support plate 230 to temporarily fix them, and then the M36 high-strength bolt pairs are installed in the order of outside first and inside later. By temporarily fixing and gradually tightening the high-strength bolts, the stability and accurate installation of the support plate 230 are ensured. The tightening sequence of first outside and then inside avoids local stress concentration and improves the overall rigidity and strength of the structure.

[0038] Further, in step S5, the tightening of the high-strength bolt pair is divided into initial tightening and final tightening, and the initial tightening torque and the re-tightening torque are 50% of the final tightening torque. The initial tightening and re-tightening steps help to reduce the loosening phenomenon of the bolt during the tightening process. The bolt may have some slight relaxation after the initial tightening, and this part of the relaxation can be compensated by re-tightening to ensure that the final pre-tightening force meets the design requirements. At the same time, the initial tightening and re-tightening steps help to ensure that the contact surfaces of the connectors are completely fitted, eliminate gaps, and improve the tightness and sealing of the connection. By tightening in steps, this situation can be avoided, ensuring that the bolts work within the elastic range and extending their service life. Gradually tightening can reduce the risk of damage to the connector due to overtightening and ensure the integrity and functionality of the connector. The initial tightening and re-tightening steps provide a basis for the final tightening, ensuring that the pre-tightening force of the bolts meets the design requirements when the final tightening is tightened. 50% of the final tightening torque is used as the torque value for initial tightening and re-tightening, which can ensure that the pre-tightening force during the final tightening is uniform and reaches the design value. When finally tightened, the preload force of the bolt reaches the design value, ensuring the reliability and safety of the connection and avoiding loosening or failure of the connection due to insufficient preload force. Furthermore, in the installation of the temporary support and beam adjustment device in step S6, the precise installation of the jack and the temporary support 500 ensures the fine adjustment of the linear shape of the steel box girder and improves the accuracy of the construction. Ribs are added at key locations to enhance the rigidity and strength of the structure and ensure the stability and safety of the structure during the adjustment process. Furthermore, referring to Figure 4In step S6, the hydraulic oil pipes and cables required for the three-way top 300 and the control cabinet are laid out and protective measures are taken. The top elevations of the temporary support 500 and the three-way top 300 are collected and compared with the designed bottom elevation of the steel box girder, and the number of pad layers is adjusted. By taking protective measures for the hydraulic oil pipes and cables, the oil pipes and cables can be prevented from being damaged during the construction process, ensuring the normal operation of the hydraulic system and the electrical system. This not only improves the reliability of the system, but also reduces the maintenance and replacement costs caused by damage. By re-measuring and collecting the top elevations of the temporary support 500 and the three-way top 300, the precise positions of these key components can be ensured, providing accurate data support for the subsequent linear adjustment of the steel box girder. By comparing the collected elevation data with the designed bottom elevation of the steel box girder, any deviations can be found and corrected to ensure that the linear adjustment of the steel box girder meets the design requirements. According to the elevation comparison results, adjusting the number of pad layers can accurately control the height of the temporary support 500 and the three-way top 300, thereby achieving fine-tuning of the linear shape of the steel box girder. This helps ensure the accuracy and stability of the steel box girder in the final installation position. Through repeated measurements and adjustments, the error can be gradually reduced to ensure that the final installation accuracy meets the design requirements and improve the construction quality.

[0039] The present invention ensures the accurate installation of the load-bearing beam 100 at the crossbeam on the main tower through systematic construction steps, thereby improving the efficiency and quality of construction. The accurate installation of embedded parts and the reasonable connection of the components of the load-bearing beam 100 ensure the overall stability and safety of the structure, and provide reliable support for the jack to adjust the steel box beam. The components of the load-bearing beam 100 can be pre-processed in the steel structure manufacturing plant and then transported to the site for assembly and welding. This modular design allows the load-bearing beam 100 to be quickly adjusted and reused according to actual site needs, greatly improving the flexibility and adaptability of construction; through segmented prefabrication and on-site assembly, the present invention significantly reduces the weight and volume of a single component, making it more convenient to carry and install, which not only reduces the dependence on large-scale machinery and equipment, but also reduces construction costs, reduces the risk of high-altitude operations, and improves construction safety; the components are connected by welding, and stiffening plates are provided for local reinforcement, ensuring the overall rigidity and strength of the structure. In particular, ribs are added to the load-bearing beam at the preset positions of the jack and the temporary support 500, corresponding to the positions of the internal stiffening ribs of the steel box beam, thereby effectively expanding the force-bearing area, avoiding local stress concentration, and improving the bearing capacity and stability of the structure.

[0040] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0041] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A construction method for adjusting a load-bearing beam for a steel box beam based on a jack, characterized in that: The following steps are involved: S1: Install embedded parts: make thin steel plate positioning parts, pre-drill holes on the thin steel plate, and place the thin steel plate at a predetermined position for fixing. The embedded parts adopt climbing cone embedded components, including climbing cones, high-strength screws, and embedded parts plates. The anchoring depth of the embedded parts is greater than or equal to 300 mm. S2: Manufacturing of the load-bearing beam (100): the load-bearing beam (100) comprises two long longitudinal beams (110), a corbel beam (140), a short longitudinal beam (120) and a short cross beam (130), wherein the corbel beam (140) is fixed to the bottom of the long longitudinal beams (110) and the short cross beam (130), the long longitudinal beams (110) and the embedded components are connected by bolts, the two ends of the short cross beam (130) are respectively vertically fixed to one end of the two long longitudinal beams (110), and the short longitudinal beam (120) is vertically fixed to the short cross beam (130); ribs are added at the joints of the components of the load-bearing parts for reinforcement, and the height of the weld leg of each fillet weld is greater than or equal to 0.7 times the thickness of the adjacent plate; S3: Installation of the operating platform (200): Use an ink line to pop out a beam positioning line on the corbel beam (140), weld the toggle plate (210) to the upper beam of the operating platform (200) in advance, lift the main frame of the operating platform (200) to a suitable height, adjust the plane position to meet the requirements, and then weld and fix it; S4: Installation of the load-bearing beam (100): The load-bearing beam (100) is hoisted to the designed position in the order of the long longitudinal beam (110), the short longitudinal beam (120) and the short cross beam (130); the flatbed truck loads the components of the load-bearing beam (100) to the main pier construction platform, and the crane hoists the load-bearing beam (100) to the height of the lower cross beam (220); the plane position of each component of the load-bearing beam (100) is adjusted, and the alignment of the bolt hole of the load-bearing beam (100) and the climbing cone hole and the fit between the thin steel plate and the lower cross beam (220) are checked one by one. After checking that everything is correct, the hook is lowered and unhooked. If there is a large deviation, the position is adjusted again; S5: Installation of the support plate (230): positioning the support plate (230) using a hand hoist; connecting the backing plate of the embedded parts and performing hole processing, and reserving an operation hole on the top plate; S6: Installation of temporary support and beam adjustment device: The three-way top (300) and the temporary support (500) are hoisted to the predetermined position by a crane and fixed by welding, ribs are added at the positions of the three-way top (300) and the temporary support (500), and ribs are added inside the corresponding load-bearing beam (100).

2. The construction method according to claim 1, characterized in that: The installation of embedded parts mentioned in step S1 mainly includes the following steps: S11, counting the number of embedded parts installed and preparing finished products of qualified quality; S12, processing the thin steel plate and accurately controlling the relative position relationship; S13, on-site setting out, the embedded parts are installed as a whole simultaneously with the upper steel bar binding stage of the lower cross beam (220); S14. During the concrete pouring process, closely observe the deviation of the embedded parts and correct them in time if there is any deviation; S15, after the concrete is demoulded, the position of the embedded parts is re-measured in time, and the processing and manufacturing of the load-bearing beam (100) is guided according to the deviation.

3. The construction method according to claim 1, characterized in that: During the installation of the installation operation platform (200) of the load-bearing beam (100) mentioned in step S3, the upper platform is hoisted again and installed on the upper part of the upper crossbeam, and the upper platform is welded and fixed to the overlapping area of ​​the upper crossbeam and the side panel of the corbel beam (140).

4. The construction method according to claim 1, characterized in that: In the installation of the load-bearing beam (100) in step S4, before the load-bearing beam (100) is installed, dust and oil stains at the installation position of the pier top are cleaned, and the outline of the load-bearing beam (100) is popped out with an ink line. The ink line should exceed the bottom plate size by more than 10 mm to facilitate centering inspection.

5. The construction method according to claim 1, characterized in that: In the installation of the load-bearing beam (100) in step S4, a high-strength bolt pair is used for initial positioning, and each plate of the load-bearing beam (100) is sealed and reinforced, and a load-bearing counterweight block (400) is installed.

6. The construction method according to claim 1, characterized in that: In the step S4, the short longitudinal beam (120) is connected to the main tower embedded part by bolts, and the long longitudinal beam (110), the short longitudinal beam (120), the short cross beam (130) and the corbel beam (140) are fixedly connected by welding.

7. The construction method according to claim 1, characterized in that: In the step S5, the distance between the corbel beam (140) and the embedded part is re-measured, and the size of the support plate (230) is adjusted on site according to the deviation.

8. The construction method according to claim 1, characterized in that: In the step S5, the positioning pin and the temporary bolt are inserted into the bolt hole of the support plate (230) and the climbing cone hole to temporarily fix them, and then the M36 high-strength bolt pair is sequentially installed in the order of first the outside and then the inside.

9. The construction method according to claim 1, characterized in that: In the step S5, the tightening of the high-strength bolt pair is divided into initial tightening and final tightening, and the initial tightening torque and the re-tightening torque are 50% of the final tightening torque.

10. The construction method according to claim 1, characterized in that: In step S6, the three-way top (300) and the hydraulic oil pipes and cables required for the control cabinet are laid out and protective measures are taken. The top elevations of the temporary support (500) and the three-way top (300) are remeasured and collected and compared with the designed bottom elevation of the steel box girder, and the number of pad layers is adjusted.

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