Large cantilever bent cap support and construction method

Abstract

The invention relates to a large cantilever bent cap support and a construction method, and belongs to the technical field of bridge construction. The two piers are arranged on the bearing platform, the main frame assembly is detachably connected with the piers, the horizontal support is erected at the tops of the piers, and the main frame assembly supports the horizontal support; the top of the horizontal support is detachably connected with an installation platform. The pulley mechanism is installed on the installation platform. The pulley mechanism comprises a first pulley assembly and a second pulley assembly; the first pulley assembly is installed at the end of the installation platform, the second pulley assembly is installed in the middle of the horizontal support, the first pulley assembly and the second pulley assembly are connected through a steel cable, the first pulley assembly changes the downward stress direction of the support cantilever into the upward stress direction, and the second pulley assembly is used for saving the stress of the support cantilever. The bridge pier can be supported from the top of the large cantilever support, use of ground supports is greatly reduced, influence and dependence on ground activities are reduced, and the bridge pier is concentrated in stress and stable in structure.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a large cantilever cap beam support and a construction method. Background Art

[0002] Since the cantilever part of the large cantilever cap beam support is long and the force is complex, if the structural design is unreasonable or the construction and installation accuracy is not high, it is easy to cause the overall stability of the support to be insufficient, and there will be shaking or tilting. Especially under the influence of external factors such as wind load and temperature stress, the stability problem of the support is more prominent. In order to ensure the construction of the large cantilever cap beam, the full-height support method is usually used to support the large cantilever cap beam.

[0003] However, due to the large span of the large cantilever support, if it is constructed in the city, the support supporting the large cantilever cap beam will occupy the ground space and affect the urban traffic; secondly, if it is constructed in the field, the geological conditions in the field are relatively complex, and the geology will be soft. It is necessary to drive the steel pipe piles into a deeper depth to enhance the stability of the foundation so that the support can be erected and support the large cantilever cap beam from the bottom. However, this approach seriously prolongs the construction period and construction cost, and cannot guarantee that the foundation is still strong and the support is still strong in the event of bad weather, such as long-term heavy rain. For example, publication number CN118127949A discloses a bottom-supported assembly support system for a large cantilever cap beam and its construction method, wherein the support system includes a sand box, and is characterized in that it also includes: a pier assembly, a main load-bearing truss, and a tension balance rod; the pier assembly includes a plurality of steel pipe piers arranged around the pier column, and the column foot of the steel pipe pier is connected to a steel plate pre-buried in the cap, and the column head of the steel pipe pier is connected to the steel plate under the sand box; the tension balance rod is symmetrically arranged on both sides of the pier column, and its upper end is connected to the lower chord rod, and the lower end is connected to the cap. It solves the problem that cantilever construction can be carried out in a limited space, and at the same time, it can solve the pain point problem of excessive bending moment at the cantilever root of the large cantilever cap beam.

[0004] It can be seen that it is particularly important to seek a large cantilever cap beam support that can replace the bottom support and does not affect the bottom surface activities. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a large cantilever cap beam support and a construction method, which solves the problem that the existing large cantilever cap beam support erection method usually adopts full-bridge support, which affects the bottom surface activities and easily causes unstable support.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A large cantilever cap beam support, comprising a pier, a pulley mechanism, a horizontal support and a main frame assembly; two piers are arranged on a cap, the main frame assembly is detachably connected to the piers, the horizontal support is erected on the top of the piers, and the main frame assembly supports the horizontal support; the top of the horizontal support is detachably connected to a mounting platform, and the pulley mechanism is mounted on the mounting platform; The pulley mechanism includes a first pulley assembly and a second pulley assembly; the first pulley assembly is installed at the end of the mounting platform, the second pulley assembly is installed in the middle of the horizontal bracket, the first pulley assembly and the second pulley assembly are connected by a steel cable, the second pulley assembly is located at the top of the first pulley assembly, the first pulley assembly changes the downward force direction of the bracket cantilever to an upward force direction, and the second pulley assembly is used to save the force size of the bracket cantilever.

[0007] Preferably, the number of the pulley mechanisms includes at least two groups.

[0008] Preferably, the first pulley assembly is a first fixed pulley block, one end of the steel cable is fixed to the first fixed pulley block, and the pulley passing through the first fixed pulley block is connected to the second pulley assembly.

[0009] Preferably, the second pulley assembly includes a gantry mounting seat, a second fixed pulley block and a movable pulley block; the gantry mounting seat is mounted on the top of the horizontal bracket, the second fixed pulley block is fixedly mounted on the bottom of a transverse plate provided on the gantry mounting seat, the movable pulley block is slidingly connected to the second fixed pulley block via the steel cable, the steel cable is first slidingly connected to the second fixed pulley block and then connected to the movable pulley block, and extends from the movable pulley block and is fixedly connected to an adjustment mechanism mounted on the top of the transverse plate.

[0010] Preferably, the adjustment mechanism includes a main control unit, a detection component, a first adjustment component and a second adjustment component, the detection component, the first adjustment component and the second adjustment component are all electrically connected to the main control unit; the first adjustment component and the second adjustment component are respectively fixedly connected to the steel cables at both ends, the detection component is connected to the pulley mechanisms at both ends, and is used to detect the height difference between the two groups of movable pulleys, the detection component uploads the height difference data to the main control unit, and the main control unit drives the first adjustment component or the second adjustment component to move according to the height difference data, so as to reduce the height difference between the two groups of movable pulleys.

[0011] Preferably, the detection component includes a distance measuring member and a telescopic member; the two ends of the telescopic member are respectively mounted on the second fixed pulley group and the movable pulley group, the telescopic member includes a fixed section and a movable section, the fixed section is fixedly mounted on the second fixed pulley group, the movable section is fixedly mounted on the movable pulley group, the movable section is sleeved on the fixed section and is slidably connected to the fixed section; the distance measuring member is installed on two groups of movable pulley groups for detecting the height difference between the two groups of movable pulley groups; the distance measuring member includes a first detector and a second detector; the first detector and the second detector are respectively fixedly connected to the movable pulley group through a connecting rod, and the first detector and the second detector are slidably connected; the first detector and the second detector are both equipped with a displacement sensor.

[0012] Preferably, the structures of the first adjusting component and the second adjusting component are consistent, and both the first adjusting component and the second adjusting component include a lifting member and a winding member, and both the lifting member and the winding member are installed on the top of the cross plate, and the steel cable is connected to the lifting member from the movable pulley set and is fixedly wound on the winding member through the lifting member; the lifting member is electrically connected to the main control unit, and is used to drive the steel cable to rise or fall.

[0013] Preferably, there are two piers and they are symmetrically arranged; the main frame assembly includes a clamp, a steel pole, a drop block and a middle truss; the clamp is installed on any one of the piers by bolts, the steel pole is installed on the side of any one of the clamps away from the pier, the drop block is installed on the top of the steel pole, the bottom of the middle truss is connected to the drop block by bolts, and the middle truss is used to connect the two piers.

[0014] Preferably, the horizontal support includes a cantilever truss, a distribution beam, a triangular truss and a formwork; the cantilever truss is connected to the middle truss, the distribution beam is laid on the top of the cantilever truss and the middle truss, there are two triangular trusses, the triangular trusses are erected on the top of the distribution beam and are located on both sides of two piers, and the formwork is laid between the triangular trusses on both sides.

[0015] A large cantilever cap beam support construction method comprises the following steps: S1: Install the clamp. First install half of the clamp and then install the remaining half. Use an electric wrench to tighten the bolts. During the installation process, adjust the concentricity of the clamp and the pier. After installation, adjust the elevations of the two bottom load-bearing clamps to be consistent. S2: Installation of steel poles. According to the pier calibration height, calculate the length of the steel pole segment combination, and lay them flat on the ground to assemble them. Use an electric wrench to tighten the steel pole connection bolts. Lift the flat steel pier vertically and close to the hoop. After the crane lifts the steel pole to a distance of no more than 20 cm from the pier and the hoop, lower the steel pole to the connection position of the hoop. S3: Installation of the unloading block and the middle truss. The unloading block is composed of four isosceles trapezoidal cross-section supports at the top, bottom, left and right. The unloading block is pre-assembled on the ground and hoisted as a whole after the nuts are locked. The middle truss piece is dropped onto the unloading block by a crane; S4: Cantilever truss installation; S401: Single-side cantilever truss installation; S402: Install the single-width cantilever trusses on opposite sides and install the cross-joints; S403: Installation of cantilever trusses on one side of the remaining span; S404: Installation of cantilever trusses on the opposite sides of the remaining section; S5: Installation of the pulley mechanism and the detection component; installing the gantry bracket, fixing the detection component, installing the pulley mechanism on the installation platform, connecting the pulley mechanism and the detection component with a steel cable, and adjusting the tension of the steel cable through the detection component; S6: Distribution beam and formwork installation.

[0016] The beneficial effects of the present invention are: By introducing the first pulley assembly, the original downward gravity direction of the cantilever part of the support is converted into an upward pulling direction along the steel cable. This conversion effectively reduces the direct pressure of the support on the horizontal surface of the top of the pier, thereby reducing the impact on the bottom activity space and reducing the number of supports for the cantilever from the bottom. The setting of the second pulley assembly not only serves as a force transmission medium, but also realizes a further optimized distribution of the steel cable tension, so that the steel cable tension can be dispersed during the transmission process, thereby reducing the traction force of the cantilever part of the support and improving the load-bearing efficiency and stability of the overall structure. The detachable connection design between the main frame assembly and the pier, and the horizontal support and the installation platform enhances the flexibility and adaptability of the support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of a large cantilever cap beam support provided in one embodiment of the present invention; Figure 2 It is a schematic diagram of the installation structure of the second pulley assembly provided in one embodiment of the present invention; Figure 3A schematic diagram of the installation structure of the first adjustment component and the second adjustment component provided in one embodiment of the present invention; Figure 4 A schematic diagram of the construction structure of a large cantilever cap beam support provided in one embodiment of the present invention; Legend: 1. Pier; 2. Horizontal support; 21. Installation platform; 22. Cantilever truss; 23. Distribution beam; 24. Triangular truss; 25. Formwork; 3. Main frame assembly; 31. Clamp; 32. Steel pole; 33. Unloading block; 34. Middle truss; 41. First pulley assembly; 421. Second fixed pulley block; 422. Movable pulley block; 43. Gantry mounting seat; 431. Cross plate; 5. Steel cable; 62. Detection assembly; 6211. First detector; 6212. Second detector; 622. Telescopic member; 6221. Fixed section; 6222. Movable section; 63. First adjustment assembly; 64. Second adjustment assembly; 65. Lifting member; 66. Winding member. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figure 1-Figure 4 As shown, a large cantilever cap beam support includes a bridge pier 1, a pulley mechanism, a horizontal support 2 and a main frame assembly 3; two bridge piers 1 are arranged on a cap, the main frame assembly 3 is detachably connected to the bridge piers 1, the horizontal support 2 is erected on the top of the bridge pier 1, and the main frame assembly 3 supports the horizontal support 2; the top of the horizontal support 2 is detachably connected to a mounting platform 21, and the pulley mechanism is mounted on the mounting platform 21; The pulley mechanism includes a first pulley assembly 41 and a second pulley assembly; the first pulley assembly 41 is installed at the end of the mounting platform 21, and the second pulley assembly is installed in the middle of the horizontal support 2. The first pulley assembly 41 and the second pulley assembly are connected by a steel cable 5, and the second pulley assembly is located at the top of the first pulley assembly 41. The first pulley assembly 41 changes the downward force direction of the support cantilever to an upward direction, and the second pulley assembly is used to save the force on the support cantilever; the main frame assembly 3 is detachably connected to the pier 1 to provide stable support, and the horizontal support 2 is erected on the top of the pier 1 and supported by the main frame assembly 3 to form the main bearing structure, but the problem of insufficient supporting force of the large cantilever of the cap beam has not yet been solved. The first pulley assembly 41 is installed at the end of the installation platform 21 and is the starting point of the entire pulley system. It is responsible for changing the downward gravity of the support cantilever to an upward force direction by tightening the steel cable 5, which can reduce the vertical downward force directly acting on the pier 1 and the horizontal support 2, enhance the stability of the large cantilever support, and convert it into a more balanced pulling force or tension, which is conducive to the stability of the entire support system; the second pulley assembly is installed in the middle of the horizontal support 2 and is located above the first pulley assembly 41. It utilizes the labor-saving effect of the pulley principle and effectively reduces the vertical component of the steel cable 5 on the position of the second pulley assembly by changing the force direction of the steel cable 5, thereby sharing the force of the support cantilever and pulling the tension of the large cantilever support through the steel cable 5 to the supporting area of ​​the entire pier 1, so that the force of the entire large cantilever support is concentrated. At the same time, the second pulley assembly can also save the pulling force of the large cantilever support, avoid excessive load on the pier 1, and make the force more uniform.

[0021] The first pulley assembly 41 and the second pulley assembly are tightly connected by the steel cable 5. As a medium for transmitting force, the high strength and toughness of the steel cable 5 ensure the accuracy and reliability of force transmission; when the weight and load of the large cantilever bracket are transmitted to the first pulley assembly 41 through the steel cable 5, the first pulley assembly 41 changes the direction of the force and transmits it to the second pulley assembly. At the second pulley assembly, the direction of the force changes again and is distributed along the horizontal support 2, and is finally transmitted to the pier 1 and the pedestal. Through the design of this pulley mechanism, the large cantilever cap beam support can effectively convert the vertical downward force generated by the cantilever into a more dispersed and balanced pulling force or tension, which helps to reduce the concentrated effect of single-point force and improve the stability and carrying capacity of the entire support system; at the same time, due to the labor-saving effect of the pulley mechanism, the burden on the pier 1 and the horizontal support 2 can be reduced to a certain extent, and the dependence on the ground support assembly can be reduced, thereby reducing the impact on ground activities during construction. At the same time, even in the case of harsh foundation environment and easy long-term water accumulation, the large cantilever support can be supported from the top to ensure the progress of construction and reduce construction costs, making the entire support system more economical, safe and reliable.

[0022] In summary, by introducing the first pulley assembly 41, the original downward gravity direction of the cantilever part of the support is converted into the upward tension direction along the steel cable 5. This conversion effectively reduces the direct pressure of the support on the horizontal surface of the top of the pier 1, thereby reducing the impact on the bottom surface activity space, and can reduce the number of supports for the cantilever from the bottom; the setting of the second pulley assembly not only serves as a force transmission medium, but also realizes the further optimized distribution of the tension of the steel cable 5, so that the tension of the steel cable 5 can be dispersed during the transmission process, thereby reducing the traction force of the cantilever part of the support and improving the bearing efficiency and stability of the overall structure; the detachable connection design between the main frame assembly 3 and the pier 1, the horizontal support 2 and the installation platform 21, enhances the flexibility and adaptability of the support system. This modular design facilitates rapid installation, adjustment and disassembly according to specific construction requirements, and is also convenient for transportation and storage, reducing construction costs and time.

[0023] In one embodiment, the number of pulley mechanisms includes at least two groups, and the two groups of pulley mechanisms respectively support the large cantilever brackets at both ends of the pier 1 from the top, thereby ensuring that the cap beams at both ends of the pier 1 are balanced in force and the structure is stable during the construction process.

[0024] In one embodiment, the first pulley assembly 41 is a first fixed pulley group, one end of the steel cable 5 is fixed to the first fixed pulley group, and the pulley passing through the first fixed pulley group is connected to the second pulley assembly; through the combination of the first fixed pulley group and the second pulley assembly, the steel cable 5 can efficiently transmit the pulling force, and the first fixed pulley group is first used to change the force direction of the large cantilever bracket, and then the second pulley assembly is used to generate traction on the end of the large cantilever bracket.

[0025] In one embodiment, the second pulley assembly includes a gantry mounting seat 43, a second fixed pulley block 421 and a movable pulley block 422; the gantry mounting seat 43 is mounted on the top of the horizontal support 2, the second fixed pulley block 421 is fixedly mounted on the bottom of the horizontal plate 431 provided on the gantry mounting seat 43, and the movable pulley block 422 is slidably connected to the second fixed pulley block 421 through the steel cable 5, the steel cable 5 is first slidably connected to the second fixed pulley block 421 and then connected to the movable pulley block 422, and extends from the movable pulley block 422 and is fixedly connected to the adjustment mechanism installed on the top of the horizontal plate 431; the gantry mounting seat 43 is firmly mounted on the top of the horizontal support 2 as a supporting structure, providing a stable base. The second fixed pulley block 421 is fixedly mounted on the bottom of the horizontal plate 431 of the gantry mounting seat 43 to ensure that the pulley does not change position when guiding the steel cable 5, and the steel cable 5 is first slidably connected to the second fixed pulley block 421, which changes the travel direction of the steel cable 5 so that it can move according to a predetermined path. Subsequently, the steel cable 5 passes around the movable pulley block 422. The design of the movable pulley block 422 allows it to slide freely when the steel cable 5 is pulled, thereby reducing the required pulling force according to the working principle of the movable pulley. The existence of the movable pulley block 422 is one of the core elements of this mechanism. It can reduce the required pulling force through multiple stages of the pulley. When towing the top of the large cantilever bracket, the required driving force is significantly reduced. The pulley mechanism achieves effective traction on the top of the large cantilever bracket through coordinated operation. During the traction process, the steel cable 5 moves along a predetermined path, while utilizing the labor-saving characteristics of the movable pulley block 422 to reduce the demand for driving force.

[0026] In one embodiment, the adjustment mechanism includes a main control unit, a detection component 62, a first adjustment component 63 and a second adjustment component 64, and the detection component 62, the first adjustment component 63 and the second adjustment component 64 are all electrically connected to the main control unit; the first adjustment component 63 and the second adjustment component 64 are respectively fixedly connected to the steel cables 5 at both ends, and the detection component 62 is connected to the pulley mechanism at both ends to detect the height difference between the two sets of movable pulleys 422, and the detection component 62 uploads the height difference data to the main control unit, and the main control unit drives the first adjustment component 63 or the second adjustment component 64 to move according to the height difference data to reduce the height difference between the two sets of movable pulleys; in order to avoid deformation or damage of the large cantilever bracket structure caused by the traction force eccentric load of the large cantilever brackets on both sides, the detection component 62 can It is able to monitor the height difference between the two sets of movable pulleys 422 in real time, which is one of the key factors affecting the force balance at both ends; once it is detected that the height difference exceeds the preset range, the main control unit will respond immediately by driving the first adjustment component 63 or the second adjustment component 64 to make fine adjustments to reduce the height difference, thereby ensuring that the steel cables 5 at both ends always maintain approximately equal tension and achieve force balance; by accurately controlling the tension of the steel cables 5 at both ends, it can ensure that the cap beam remains horizontal during the lifting or moving process, avoiding tilting or twisting caused by uneven force, thereby improving the construction quality of the cap beam, and the first adjustment component 63 and the second adjustment component 64 make fine adjustments according to the instructions of the main control unit, changing the length of the steel cables 5 connected to each other, thereby adjusting the height difference between the two sets of movable pulleys 422. At the same time, the detection component 62 continues to monitor the height difference changes and uploads new data to the main control unit to form a closed-loop control.

[0027] In one embodiment, the structure of the detection component 62 includes a distance measuring member and a telescopic member 622; the two ends of the telescopic member 622 are respectively installed on the second fixed pulley and the movable pulley, and the telescopic member 622 includes a fixed section 6221 and a movable section 6222, the fixed section 6221 is fixedly installed on the second fixed pulley, and the movable section 6222 is fixedly installed on the movable pulley, and the movable section 6222 is sleeved on the fixed section 6221 and slidably connected to the fixed section 6221; the distance measuring member is installed on the two sets of movable pulleys for detecting the height difference between the two sets of movable pulleys; the distance measuring member It includes a first detector 6211 and a second detector 6212; the first detector 6211 and the second detector 6212 are fixedly connected to the movable pulley through a connecting rod, and the first detector 6211 and the second detector 6212 are slidably connected; the first detector 6211 and the second detector 6212 are both equipped with displacement sensors; the telescopic member 622 is composed of a fixed section 6221 and a movable section 6222, the fixed section 6221 is firmly mounted on the second fixed pulley, and the movable section 6222 is fixedly mounted on the movable pulley. As the movable pulley moves on the steel cable 5, the movable section 6222 will slide relative to the fixed section 6221, and this sliding relationship directly reflects the vertical position change of the movable pulley relative to the second fixed pulley (i.e., the reference point). The distance measuring member is composed of a first detector 6211 and a second detector 6212, which are fixedly connected to their respective movable pulleys through connecting rods to ensure synchronous movement with the movable pulley. The first detector 6211 and the second detector 6212 are connected by sliding so that they can move relative to each other to adapt to the height difference between the two sets of movable pulleys. The sensor can accurately measure the relative displacement between the two sets of movable pulleys, that is, the height difference between the two sets of movable pulleys. The displacement sensor converts this physical quantity into an electrical signal for processing and analysis by the main control unit; through the circuit or communication system connected to the main control unit, the first detector 6211 and the second detector 6212 transmit the measured height difference data to the main control unit. Based on the received data, the main control unit can understand the height difference between the two sets of movable pulleys in real time and make corresponding adjustment instructions accordingly; by accurately controlling the height difference between the two sets of movable pulleys, structural deformation or damage caused by uneven force can be avoided, and the integrity and stability of the large cantilever bracket and its related components can be protected.

[0028] In one embodiment, the first adjusting component 63 and the second adjusting component 64 have the same structure. Both the first adjusting component 63 and the second adjusting component 64 include a lifting member 65 and a winding member 66. Both the lifting member 65 and the winding member 66 are installed on the top of the horizontal plate 431. The steel cable 5 is connected to the lifting member 65 from the driven pulley block 422, and is fixedly wound on the winding member 66 after passing through the lifting member 65. The lifting member 65 is electrically connected to the main control unit, and is used to drive the steel cable 5 to rise or fall. After receiving the command from the main control unit, the lifting member 65 starts to work. If the command is to raise the steel cable 5, the lifting member 65 will drive its internal mechanical structure to make the part of the steel cable 5 connected thereto rise or fall. Raise, on the contrary, if the instruction is to lower the steel cable 5, the lifting member 65 will perform the reverse operation to partially lower the steel cable 5. While the lifting member 65 drives the steel cable 5 to rise and fall, the winding member 66 (such as a motor-driven winch) also plays a key role. The winding member 66 can fix and wind the steel cable 5 to ensure that the steel cable 5 can move smoothly without causing confusion or knotting when the lifting member 65 is in action. Through the coordinated work of the lifting member 65 and the winding member 66, the length of the steel cable 5 is accurately adjusted. When the tension of the steel cable 5 at one end is too large, the tension can be reduced by reducing the length of the steel cable 5 at that end, thereby ensuring that the force at both ends of the cap beam bracket is balanced.

[0029] In one embodiment, there are two piers 1, which are symmetrically arranged; the main frame assembly 3 includes a clamp 31, a steel pole 32, a drop block 33 and a middle truss 34; the clamp 31 is installed on any pier 1 by bolts, the steel pole 32 is installed on the side of any clamp 31 away from the pier 1, the drop block 33 is installed on the top of the steel pole 32, the bottom of the middle truss 34 is connected to the drop block 33 by bolts, the middle truss 34 is provided with a clamp 31, the clamp 31 is fixed to the pier 1, and the middle truss 34 is used to connect two piers 1; the clamp 31 is tightly installed on any pier 1 by bolts, ensuring a firm connection with the pier 1, which is not only convenient for installation and disassembly, but also can effectively transmit the force from the support system; the steel pole 32 is installed on the side of the clamp 31 away from the pier 1 as a vertical support structure, and the drop block 33 is installed on the top of the steel pole 32 to further disperse and transmit the force from the support system. The design of the unloading block 33 also takes into account the adjustment needs during the construction process, and can be easily adjusted or disassembled when necessary; the middle truss 34 is a key component connecting the two piers 1. Its bottom is connected to the unloading block 33 by bolts, and the top is fixed to the other pier 1 by the clamp 31, so that the middle truss 34 can stably span the two piers 1 to form a strong horizontal support structure; the middle truss 34 not only enhances the overall stability of the support system, but also enables the force to be more evenly distributed to the two piers 1. When the cantilever is subjected to external loads, these loads first act on the installation platform 21 and the equipment thereon, and then, through the transmission of structural components such as the horizontal support 2, the middle truss 34 and the steel uprights 32, they are finally dispersed to the two piers 1. In this process, connectors such as the clamp 31, the unloading block 33 and the clamp 31 play a key role in ensuring the accurate transmission and dispersion of force.

[0030] In one embodiment, the horizontal support 2 includes a cantilever truss 22, a distribution beam 23, a triangular truss 24 and a formwork 25; the cantilever truss 22 is connected to the middle truss 34 by a spiral, the distribution beam 23 is laid on the top of the cantilever truss 22 and the middle truss 34, there are two triangular trusses 24, the triangular trusses 24 are erected on the top of the distribution beam 23 and are located on both sides of the two piers 1, and the formwork 25 is installed on the distribution beam 23 between the triangular trusses 24 and the triangular trusses 24.

[0031] A large cantilever cap beam support construction method comprises the following steps S1: Installation of the clamp 31: first install half of the clamp 31 and then install the remaining half of the clamp 31; tighten the bolts with an electric wrench; adjust the concentricity of the clamp 31 with the pier 1 during the installation process; adjust the elevations of the two bottom load-bearing clamps 31 to be consistent after installation; this helps to accurately adjust the position and angle of the clamp 31, adjust the concentricity of the clamp 31 with the pier 1, ensure that the clamp 31 can be evenly stressed, avoid local stress concentration, improve the stability and durability of the overall structure, ensure that the elevations of the two bottom load-bearing clamps 31 are consistent, provide an accurate reference surface for subsequent installation, and ensure the verticality and horizontality of the entire support system.

[0032] S2: Installation of steel poles 32. Calculate the combined segment length of steel poles 32 according to the elevation of pier 1, and assemble them flat on the ground. Tighten the connecting bolts of steel poles 32 with an electric wrench. Lift the flat steel pier 1 vertically close to the clamp 31. After the crane lifts the steel poles 32 to a distance of no more than 20 cm from the pier 1 and the clamp 31, lower the steel poles 32 to the connection position of the clamp 31. Calculate the combined segment length of steel poles 32 according to the elevation of pier 1 to ensure that the poles can meet the design height requirements after installation. assemble and form steel poles 32 on the ground to facilitate operation and quality control and reduce the risk of high-altitude operations.

[0033] S3: The unloading block 33 and the middle truss 34 are installed. The unloading block 33 is composed of four supports with isosceles trapezoidal cross-sections, namely the upper, lower, left and right ones. The unloading block 33 is pre-assembled on the ground and hoisted as a whole after the nuts are locked; the middle truss 34 is dropped on the unloading block 33 by a crane, and the unloading block 33 is pre-assembled on the ground and the nuts are locked to ensure that the unloading block 33 will not loosen during the installation process, thereby improving the installation efficiency; the pre-assembled unloading block 33 is hoisted as a whole to reduce the amount of high-altitude operations and improve the installation safety; the middle truss 34 is accurately placed on the unloading block 33 by a crane to form a stable supporting structure.

[0034] S4: cantilever truss 22 installation; S401: Installation of a single-side cantilever truss 22; S402: Install the single-width opposite-side cantilever truss 22 and install the cross-connection; S403: installing the cantilever truss 22 on one side of the remaining width; S404: installing the cantilever truss 22 on the opposite side of the remaining width; The cantilever truss 22 is installed in the order of single-span side, single-span opposite side, remaining-span side, and remaining-span opposite side to ensure the installation process is carried out in an orderly manner. After the cantilever truss 22 is installed, the cross-joint is promptly installed to enhance the overall stability and rigidity of the truss. The cantilever truss is installed in steps to facilitate the control of the installation quality and progress.

[0035] S5: installation of the pulley mechanism and the detection component 62; installation of the gantry bracket, installation and fixing of the detection component 62, installation of the pulley mechanism on the installation platform 21, connection of the steel cable 5 to the pulley mechanism and the detection component 62, and adjustment of the tension of the steel cable 5 through the detection component 62; by installing the pulley mechanism and the detection component 62, the force direction of the large cantilever bracket is changed, the use and dependence on the ground support bracket is reduced, and the construction time and cost of installing the ground support are saved. By changing the force direction of the large cantilever bracket and pulling it to the pier 1 area through the pulley mechanism, the force of the entire pier 1 is concentrated and the structure is stable.

[0036] S6: The distribution beam 23 and the formwork 25 are installed to evenly distribute the load to each supporting point, thereby improving the bearing capacity of the overall structure. The formwork 25 is installed according to the design requirements to provide accurate shape and size for subsequent concrete pouring.

[0037] 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 large cantilever cap beam support, characterized in that: It includes a pier, a pulley mechanism, a horizontal support and a main frame assembly; the two piers are arranged on the cap, the main frame assembly is detachably connected to the piers, the horizontal support is erected on the top of the piers, and the main frame assembly supports the horizontal support; the top of the horizontal support is detachably connected to a mounting platform, and the pulley mechanism is mounted on the mounting platform; The pulley mechanism includes a first pulley assembly and a second pulley assembly; the first pulley assembly is installed at the end of the mounting platform, the second pulley assembly is installed in the middle of the horizontal bracket, the first pulley assembly and the second pulley assembly are connected by a steel cable, the second pulley assembly is located at the top of the first pulley assembly, the first pulley assembly changes the downward force direction of the bracket cantilever to an upward force direction, and the second pulley assembly is used to save the force size of the bracket cantilever.

2. A large cantilever cap beam support according to claim 1, characterized in that: The number of the pulley mechanisms includes at least two groups.

3. The large cantilever cap beam support according to claim 1, characterized in that: The first pulley assembly is a first fixed pulley block, one end of the steel cable is fixed to the first fixed pulley block, and the pulley passing through the first fixed pulley block is connected to the second pulley assembly.

4. The large cantilever cap beam support according to claim 1, characterized in that: The second pulley assembly includes a gantry mounting seat, a second fixed pulley block and a movable pulley block; the gantry mounting seat is installed on the top of the horizontal bracket, the second fixed pulley block is fixedly installed on the bottom of the cross plate provided on the gantry mounting seat, the movable pulley block is slidably connected with the second fixed pulley block through the steel cable, the steel cable is first slidably connected with the second fixed pulley block and then connected with the movable pulley block, and extends from the movable pulley block and is fixedly connected with the adjustment mechanism installed on the top of the cross plate.

5. The large cantilever cap beam support according to claim 4, characterized in that: The adjustment mechanism includes a main control unit, a detection component, a first adjustment component and a second adjustment component; the detection component, the first adjustment component and the second adjustment component are all electrically connected to the main control unit; the first adjustment component and the second adjustment component are respectively fixedly connected to the steel cables at both ends, and the detection component is connected to the pulley mechanisms at both ends to detect the height difference between the two groups of movable pulleys, and the detection component uploads the height difference data to the main control unit, and the main control unit drives the first adjustment component or the second adjustment component to move according to the height difference data to reduce the height difference between the two groups of movable pulleys.

6. The large cantilever cap beam support according to claim 5, characterized in that: The detection component includes a distance measuring member and a telescopic member; the two ends of the telescopic member are respectively mounted on the second fixed pulley group and the movable pulley group, the telescopic member includes a fixed section and a movable section, the fixed section is fixedly mounted on the second fixed pulley group, the movable section is fixedly mounted on the movable pulley group, the movable section is sleeved on the fixed section and is slidably connected to the fixed section; the distance measuring member is installed on the two groups of movable pulley groups for detecting the height difference between the two groups of movable pulley groups; the distance measuring member includes a first detector and a second detector; the first detector and the second detector are respectively fixedly connected to the movable pulley group through a connecting rod, and the first detector and the second detector are slidably connected; the first detector and the second detector are both equipped with a displacement sensor.

7. The large cantilever cap beam support according to claim 6, characterized in that: The first adjustment assembly and the second adjustment assembly have the same structure. Both the first adjustment assembly and the second adjustment assembly include a lifting member and a winding member. Both the lifting member and the winding member are installed on the top of the transverse plate. The steel cable is connected to the lifting member from the movable pulley block and is fixedly wound on the winding member through the lifting member. The lifting member is electrically connected to the main control unit and is used to drive the steel cable to rise or fall.

8. The large cantilever cap beam support according to claim 1, characterized in that: There are two piers and they are symmetrically arranged; the main frame assembly includes a clamp, a steel pole, a drop block and a middle truss; the clamp is installed on any one of the piers by bolts, the steel pole is installed on the side of any one of the clamps away from the pier, the drop block is installed on the top of the steel pole, the bottom of the middle truss is connected to the drop block by bolts, and the middle truss is used to connect the two piers.

9. The large cantilever cap beam support according to claim 8, characterized in that: The horizontal support includes a cantilever truss, a distribution beam, a triangular truss and a formwork; the cantilever truss is connected to the middle truss, the distribution beam is laid on the top of the cantilever truss and the middle truss, there are two triangular trusses, the triangular trusses are erected on the top of the distribution beam and are located on both sides of two piers, and the formwork is laid between the triangular trusses on both sides.

10. A method for constructing a large cantilever cap beam support, using the large cantilever cap beam support as claimed in any one of claims 8 to 9, characterized in that: The following steps are involved: S1: Install the clamp. First install half of the clamp and then install the remaining half. Use an electric wrench to tighten the bolts. During the installation process, adjust the concentricity of the clamp and the pier. After installation, adjust the elevations of the two bottom load-bearing clamps to be consistent. S2: Installation of steel poles. According to the pier calibration height, calculate the length of the steel pole segment combination, and lay them flat on the ground to assemble them. Use an electric wrench to tighten the steel pole connection bolts. Lift the flat steel pier vertically and close to the hoop. After the crane lifts the steel pole to a distance of no more than 20 cm from the pier and the hoop, lower the steel pole to the connection position of the hoop. S3: Installation of the unloading block and the middle truss. The unloading block is composed of four isosceles trapezoidal cross-section supports at the top, bottom, left and right. The unloading block is pre-assembled on the ground and hoisted as a whole after the nuts are locked. The middle truss piece is dropped onto the unloading block by a crane; S4: Cantilever truss installation; S401: Single-side cantilever truss installation; S402: Install the single-width cantilever trusses on opposite sides and install the cross-joints; S403: Installation of cantilever trusses on one side of the remaining span; S404: Installation of cantilever trusses on the opposite sides of the remaining section; S5: Installation of the pulley mechanism and the detection component; installing the gantry bracket, fixing the detection component, installing the pulley mechanism on the installation platform, connecting the pulley mechanism and the detection component with a steel cable, and adjusting the tension of the steel cable through the detection component; S6: Distribution beam and formwork installation.

Images