A large cantilever pier cap support and construction method

Abstract

The present invention relates to a large cantilever capping beam support and a construction method, belonging to the technical field of bridge construction, and comprising bridge piers, pulley mechanisms, horizontal supports and main frame assemblies; two bridge piers are arranged on a bearing platform, the main frame assemblies are detachably connected to the bridge piers, the horizontal supports are erected on the tops of the bridge piers, and the main frame assemblies support the horizontal supports; an installation platform is detachably connected to the top of the horizontal support, and the pulley mechanisms are installed on the installation platform; the pulley mechanisms include first pulley assemblies and second pulley assemblies; the first pulley assemblies are installed at the ends of the installation platform, the second pulley assemblies are installed in the middle of the horizontal supports, the first pulley assemblies and the second pulley assemblies are connected by steel cables, the first pulley assemblies change the downward force direction of the support cantilever to upward, and the second pulley assemblies are used to save the force magnitude of the support cantilever, can support from the top of the large cantilever support, greatly reduce the use of ground supports, reduce the influence on and dependence on ground activities, the bridge piers have concentrated stress and stable structures.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and particularly relates to a large-cantilever pier cap support and a construction method thereof. Background Art

[0002] Since the cantilever part of the large-cantilever pier cap support is relatively long and the stress is complex, if the structural design is unreasonable or the construction and installation accuracy is not high, it is easy to cause insufficient overall stability of the support, resulting in shaking or tilting. Especially under the action of external factors such as wind load and temperature stress, the stability problem of the support is more prominent. Usually, in order to ensure the construction of the large-cantilever pier cap, the method of full hall support is used to support the large-cantilever pier cap.

[0003] Moreover, due to the large span range of the large-cantilever support, if it is constructed in the city, the support for the large-cantilever pier cap will occupy the ground space and affect the urban traffic. Secondly, if it is constructed in the wild, the geological conditions in the wild are relatively complex, and soft geology will be encountered. It is necessary to drive steel pipe piles to a relatively deep depth to enhance the stability of the foundation so that the support can be erected and support the large-cantilever pier cap from the bottom. However, such a method seriously prolongs the construction period and construction cost, and cannot ensure that the foundation is still firm and the support still supports the large-cantilever support in case of bad weather, such as long-term heavy rain.

[0004] For example, the publication number CN118127949A discloses a lower-bearing assembled support system for a large-cantilever pier cap and a construction method thereof. The support system includes a sand box, and is characterized by further including: a pier component, a main stress truss, and a tension balance rod; the pier component includes a plurality of steel pipe piers arranged around the pier column, and the column feet of the steel pipe piers are connected to the steel plates embedded in the bearing platform, and the column heads of the steel pipe piers are connected to the lower steel plates of the sand box; the tension balance rods are symmetrically arranged on both sides of the pier column, and the upper ends thereof are connected to the lower chord rods and the lower ends are connected to the bearing platform. It solves the problems that not only can cantilever construction be carried out in a limited space, but also the pain point problem of excessive bending moment at the cantilever root of the large-cantilever pier cap can be solved.

[0005] Therefore, it is particularly important to find a large-cantilever pier cap support erection method that can replace the bottom support and does not affect the bottom activities. Summary of the Invention

[0006] In order to solve the above problems existing in the prior art, the invention provides a large-cantilever pier cap support and a construction method thereof, which solve the problems that the existing large-cantilever pier cap support erection method usually uses full hall support for support, affects the bottom activities and is prone to unstable support.

[0007] The purpose of the invention can be achieved by the following technical solutions:

[0008] A large cantilever capping beam support, comprising bridge piers, pulley mechanisms, horizontal supports and main frame assemblies; the two bridge piers are arranged on the bearing platform, the main frame assembly is detachably connected to the bridge piers, the horizontal support is erected on the top of the bridge piers, and the main frame assembly supports the horizontal support; an installation platform is detachably connected to the top of the horizontal support, and the pulley mechanism is installed on the installation platform;

[0009] The pulley mechanism includes 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 by a steel cable, the second pulley assembly is located above the first pulley assembly, the first pulley assembly changes the downward force direction of the support cantilever to upward, and the second pulley assembly is used to reduce the force on the support cantilever.

[0010] Preferably, the number of the pulley mechanisms is at least two groups.

[0011] Preferably, the first pulley assembly is a first fixed pulley group, and one end of the steel cable is fixed to the first fixed pulley group and is connected to the second pulley assembly after passing around the pulley of the first fixed pulley group.

[0012] Preferably, the second pulley assembly includes a gantry mounting seat, a second fixed pulley group and a movable pulley group; the gantry mounting seat is installed on the top of the horizontal support, the second fixed pulley group is fixedly installed at the bottom of the cross plate provided on the gantry mounting seat, the movable pulley group is slidably connected to the second fixed pulley group through the steel cable, the steel cable is first slidably connected to the second fixed pulley group and then connected to the movable pulley group, and extends from the movable pulley group to be fixedly connected to the adjusting mechanism installed on the top of the cross plate.

[0013] Preferably, the adjusting mechanism includes a main control unit, a detection component, a first adjusting component and a second adjusting component, and the detection component, the first adjusting component and the second adjusting component are all electrically connected to the main control unit; the first adjusting component and the second adjusting 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 movable pulley groups, the detection component uploads the height difference data to the main control unit, and the main control unit drives the first adjusting component or the second adjusting component to move according to the height difference data to reduce the height difference between the two movable pulleys.

[0014] Preferably, the detection component includes a distance measuring member and a telescopic member; both ends of the telescopic member are respectively installed on the second fixed pulley set and the movable pulley set. The telescopic member includes a fixed section and a movable section. The fixed section is fixedly installed on the second fixed pulley set, and the movable section is fixedly installed on the movable pulley set. 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 movable pulley sets for detecting the height difference between the two movable pulley sets. 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 set through connecting rods, and the first detector and the second detector are slidably connected. Both the first detector and the second detector are internally provided with displacement sensors.

[0015] Preferably, the structures of the first adjusting component and the second adjusting component are the same. The first adjusting component and the second adjusting component both include a lifting member and a winding member. The lifting member and the winding member are both installed on the top of the cross plate. The steel cable is connected from the movable pulley set to the lifting member 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.

[0016] Preferably, the number of the bridge piers is two and they are symmetrically arranged. The main frame component includes a hoop, a profiled steel vertical pole, a drop block and a middle truss. The hoop is installed on any one of the bridge piers through bolts. The profiled steel vertical pole is installed on the side of any one of the hoops away from the bridge pier. The drop block is installed on the top of the profiled steel vertical pole. The bottom of the middle truss is connected to the drop block through bolts. The middle truss is used to connect the two bridge piers.

[0017] Preferably, the horizontal support includes a cantilever truss, a distribution beam, triangular trusses and a formwork. The cantilever truss is connected to the middle truss. The distribution beam is laid on the tops of the cantilever truss and the middle truss. The number of the triangular trusses is two. The triangular trusses are erected on the top of the distribution beam and are located on both sides of the two bridge piers. The formwork is laid between the two triangular trusses on both sides.

[0018] A construction method for a large cantilever capping beam support includes the following steps:

[0019] S1: Hoop installation. First, install half of the hoop and then install the remaining half of the hoop. Use an electric wrench to tighten the bolts. Adjust the concentricity between the hoop and the bridge pier during the installation process. After installation, adjust the elevation of the two bottom load-bearing hoops to be the same.

[0020] S2: Installation of the profiled steel vertical poles. Calculate the combined section length of the profiled steel vertical poles by inversely calculating the elevation based on the pier, lay them flat on the ground for combined forming, tighten the connecting bolts of the profiled steel vertical poles with an electric wrench, lift the horizontally placed profiled steel pier by a vehicle to the vertical position and bring it close to the hoop; after the crane hoists the profiled steel vertical poles to a distance of no more than 20 cm from the pier and the hoop, lower the profiled steel vertical poles to the connection position of the hoop.

[0021] S3: Installation of the drop blocks and the middle truss. The drop block consists of 4 isosceles trapezoid-section supports on the upper, lower, left, and right sides. The drop block is pre-assembled on the ground, and after tightening the nuts, it is hoisted as a whole. The middle truss sheet is dropped onto the drop block by a crane.

[0022] S4: Installation of the cantilever truss;

[0023] S401: Installation of the single-sided cantilever truss on one side of a single lane;

[0024] S402: Installation of the single-sided cantilever truss on the opposite side of a single lane and installation of the cross bracing;

[0025] S403: Installation of the single-sided cantilever truss on one side of the remaining lane;

[0026] S404: Installation of the single-sided cantilever truss on the opposite side of the remaining lane;

[0027] S5: Installation of the pulley mechanism and the detection component; Install the gantry support, fix the detection component, then install the pulley mechanism on the installation platform, connect the steel cable to the pulley mechanism and the detection component, and adjust the tension of the steel cable through the detection component.

[0028] S6: Installation of the distribution beam and the formwork.

[0029] The beneficial effects of the present invention are as follows:

[0030] By introducing the first pulley assembly, the originally directly downward gravity action direction of the cantilever part of the support is changed to the upward pulling force direction along the steel cable. This conversion effectively reduces the direct pressure of the support on the horizontal plane of the pier top, thereby reducing the impact on the bottom activity space and enabling the reduction of the number of supports for the cantilever from the bottom; the setting of the second pulley assembly not only serves as an intermediary for force transmission but also realizes the further optimized distribution of the steel cable tension, enabling the dispersion of the steel cable tension during transmission, thereby reducing the traction force magnitude 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 between the horizontal support and the installation platform enhances the flexibility and adaptability of the support system. Description of the Drawings

[0031] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Figure 1Schematic diagram of the overall structure of the large cantilever capping beam support provided in an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the installation structure of the second pulley assembly provided in an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the installation structure of the first adjustment assembly and the second adjustment assembly provided in an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of the construction structure of the large cantilever capping beam support provided in an embodiment of the present invention;

[0036] 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, hoop; 32, steel section vertical pole; 33, drop block; 34, middle truss; 41, first pulley assembly; 421, second fixed pulley group; 422, movable pulley group; 43, gantry installation 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 implementation manners

[0037] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0038] As Figures 1-4 shown, a large cantilever capping beam support includes a pier 1, a pulley mechanism, a horizontal support 2 and a main frame assembly 3; two piers 1 are arranged on the bearing platform, the main frame assembly 3 is detachably connected to the pier 1, the horizontal support 2 is erected on the top of the pier 1, and the main frame assembly 3 supports the horizontal support 2; an installation platform 21 is detachably connected to the top of the horizontal support 2, and the pulley mechanism is installed on the installation platform 21;

[0039] 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 installation platform 21, the second pulley assembly is installed in the middle of the horizontal bracket 2, the first pulley assembly 41 and the second pulley assembly are connected by a steel cable 5, the second pulley assembly is located above the first pulley assembly 41, the first pulley assembly 41 changes the downward force direction of the bracket cantilever to upward, and the second pulley assembly is used to save the force magnitude of the bracket cantilever; the main frame assembly 3 is detachably connected to the bridge pier 1, providing stable support. The horizontal bracket 2 is erected on the top of the bridge pier 1 and supported by the main frame assembly 3 to form the main load-bearing structure, but the problem of insufficient support force of the large cantilever of the capping beam has not been solved yet. The first pulley assembly 41 is installed at the end of the installation platform 21, which is the starting point of the entire pulley system. It is responsible for changing the downward gravity of the bracket cantilever into an upward force by tightening the steel cable 5, which can reduce the vertically downward force directly acting on the bridge pier 1 and the horizontal bracket 2, enhance the stability of the large cantilever bracket, and transform it into a more balanced tensile force or tension force, which helps to stabilize the entire bracket system; the second pulley assembly is installed in the middle of the horizontal bracket 2 and above the first pulley assembly 41. Utilizing the labor-saving effect in the pulley principle, by changing the force direction of the steel cable 5, it effectively reduces the vertical component force of the steel cable 5 on the position where the second pulley assembly is located, thus sharing the force of the bracket cantilever, and pulling the large cantilever bracket through the tensile force of the steel cable 5 to the support area of the entire bridge pier 1, making the force of the entire large cantilever bracket concentrated. At the same time, the second pulley assembly can also save the tensile force for pulling the large cantilever bracket, avoiding excessive load on the bridge pier 1 and making the force more uniform.

[0040] The first pulley assembly 41 and the second pulley assembly are tightly connected by a 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 bracket 2, and finally transmitted to the bridge pier 1 and the bearing platform. Through this design of the pulley mechanism, the large cantilever capping beam bracket can effectively convert the vertically downward force generated by the cantilever into a more dispersed and balanced tensile force or tension force, which helps to reduce the concentrated effect of single-point force, and can also improve the stability and load-bearing capacity of the entire bracket system; at the same time, due to the labor-saving effect of the pulley mechanism, it can reduce the burden on the bridge pier 1 and the horizontal bracket 2 to a certain extent, reduce the dependence on the ground support components, thereby reducing the impact on ground activities during construction. At the same time, even in the case of poor foundation environment and easy long-term water accumulation, it can support the large cantilever bracket from the top, ensure the construction progress and reduce the construction cost, making the entire bracket system more economical, safe and reliable.

[0041] In summary, by introducing the first pulley assembly 41, the original downward gravity acting direction of the cantilever part of the bracket is changed to the upward pulling force direction along the steel cable 5. This conversion effectively reduces the direct pressure of the bracket on the top horizontal plane of the pier 1, thereby reducing the impact on the bottom moving space and enabling a reduction in the number of supports for the cantilever from the bottom; the setting of the second pulley assembly not only serves as an intermediary for force transmission but also realizes a further optimized distribution of the pulling force of the steel cable 5, enabling the pulling force of the steel cable 5 to be dispersed during transmission, thereby reducing the traction force of the cantilever part of the bracket and improving the load-bearing efficiency and stability of the overall structure; the detachable connection design between the main frame assembly 3 and the pier 1, and between the horizontal bracket 2 and the installation platform 21 enhances the flexibility and adaptability of the bracket 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.

[0042] In one embodiment, the number of pulley mechanisms is 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, ensuring that the capping beams at both ends of the pier 1 are evenly stressed and the structure is stable during the construction process.

[0043] 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 passes around the pulleys of the first fixed pulley group and 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. First, the first fixed pulley group is used to change the force application direction of the large cantilever bracket, and the second pulley assembly generates a traction force on the end of the large cantilever bracket.

[0044] In one embodiment, the second pulley assembly includes a gantry mounting base 43, a second fixed pulley set 421 and a movable pulley set 422; the gantry mounting base 43 is installed on the top of the horizontal bracket 2, the second fixed pulley set 421 is fixedly installed at the bottom of the cross plate 431 provided on the gantry mounting base 43, the movable pulley set 422 is slidably connected to the second fixed pulley set 421 through a steel cable 5, the steel cable 5 is first slidably connected to the second fixed pulley set 421 and then connected to the movable pulley set 422, and extends from the movable pulley set 422 to be fixedly connected to the adjusting mechanism installed on the top of the cross plate 431; the gantry mounting base 43, as a supporting structure, is firmly installed on the top of the horizontal bracket 2, providing a stable base. The second fixed pulley set 421 is fixedly installed at the bottom of the cross plate 431 of the gantry mounting base 43 to ensure that the position of the pulley remains unchanged when guiding the steel cable 5. The steel cable 5 is first slidably connected to the second fixed pulley set 421, which changes the traveling direction of the steel cable 5 and enables it to move along a predetermined path. Subsequently, the steel cable 5 bypasses the movable pulley set 422. The design of the movable pulley set 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 presence of the movable pulley set 422 is one of the cores of this mechanism. It can reduce the required pulling force through multiple turns of the pulley. When towing the top of the large cantilever bracket, the required driving force is significantly reduced. Through the coordinated operation of the pulley mechanism, effective towing of the top of the large cantilever bracket is achieved. During the towing process, the steel cable 5 moves along a predetermined path, and at the same time, the labor-saving characteristic of the movable pulley set 422 is utilized to reduce the demand for the driving force.

[0045] In one embodiment, the adjusting mechanism includes a main control unit, a detection component 62, a first adjusting component 63, and a second adjusting component 64. The detection component 62, the first adjusting component 63, and the second adjusting component 64 are all electrically connected to the main control unit. The first adjusting component 63 and the second adjusting component 64 are respectively fixedly connected to the steel cables 5 at both ends. The detection component 62 is connected to the pulley mechanisms at both ends and is used to detect the height difference between the two sets of movable pulley groups 422. The detection component 62 uploads the height difference data to the main control unit. The main control unit drives the first adjusting component 63 or the second adjusting component 64 to move according to the height difference data to reduce the height difference between the two sets of movable pulleys. To avoid the structural deformation or damage of the large cantilever bracket caused by the off-load of the traction force on both sides of the large cantilever bracket, the detection component 62 can continuously monitor the height difference between the two sets of movable pulley groups 422, which is one of the key factors affecting the force balance at both ends. Once the detected height difference exceeds the preset range, the main control unit will immediately respond and drive the first adjusting component 63 or the second adjusting component 64 to make fine adjustments to reduce the height difference, so as to ensure that the steel cables 5 at both ends always maintain approximately equal tension and achieve force balance. By precisely controlling the tension of the steel cables 5 at both ends, it can be ensured that the capping beam remains horizontal during lifting or movement, avoiding tilting or twisting caused by uneven force, thereby improving the construction quality of the capping beam. The first adjusting component 63 and the second adjusting component 64 make fine adjustments according to the instructions of the main control unit, change the lengths of the steel cables 5 they are connected to, and thus adjust the height difference between the two sets of movable pulley groups 422. At the same time, the detection component 62 continues to monitor the change in the height difference and uploads the new data to the main control unit to form a closed-loop control.

[0046] In one embodiment, the structure of the detection component 62 includes a ranging member and a telescopic member 622; both ends of the telescopic member 622 are respectively installed on the second fixed pulley and the movable pulley. 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. The movable section 6222 is sleeved on the fixed section 6221 and is slidably connected to the fixed section 6221; the ranging member is installed on two groups of movable pulleys for detecting the height difference between the two groups of movable pulleys; the ranging member includes a first detector 6211 and a second detector 6212; the first detector 6211 and the second detector 6212 are respectively fixedly connected to the movable pulley through connecting rods, and the first detector 6211 and the second detector 6212 are slidably connected; both the first detector 6211 and the second detector 6212 are internally provided 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 installed on the second fixed pulley, while the movable section 6222 is fixedly installed 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 ranging member is composed of a first detector 6211 and a second detector 6212, which are respectively fixedly connected to their corresponding movable pulleys through connecting rods to ensure synchronous movement with the movable pulley. The first detector 6211 and the second detector 6212 are connected in a sliding manner, enabling them to move relative to each other to adapt to the change in the height difference between the two groups of movable pulleys. The sensor can accurately measure the relative displacement between them, that is, the height difference between the two groups of movable pulleys. The displacement sensor converts this physical quantity into an electrical signal for the main control unit to process and analyze; 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 situation between the two groups of movable pulleys in real time and issue corresponding adjustment instructions accordingly; by precisely controlling the height difference between the two groups of movable pulleys, it is possible to avoid structural deformation or damage caused by uneven force, protecting the integrity and stability of the large cantilever bracket and its related components.

[0047] In one embodiment, the structures of the first adjusting component 63 and the second adjusting component 64 are the same. Both the first adjusting component 63 and the second adjusting component 64 include a lifting member 65 and a winding member 66. The lifting member 65 and the winding member 66 are both installed on the top of the cross plate 431. The steel cable 5 is connected from the driven pulley group 422 to the lifting member 65 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 an instruction from the main control unit, the lifting member 65 starts to work. If the instruction is to raise the steel cable 5, the lifting member 65 will drive the mechanical structure inside it to raise the part of the steel cable 5 connected to it. On the contrary, if the instruction is to lower the steel cable 5, the lifting member 65 will perform the reverse operation to lower the part of 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 winch driven by a motor) also plays a key role. The winding member 66 can fix and wind the steel cable 5 to ensure that when the lifting member 65 acts, the steel cable 5 can move smoothly without causing chaos or knotting. Through the coordinated work of the lifting member 65 and the winding member 66, the length of the steel cable 5 is precisely adjusted. When the tension of the steel cable 5 at one end is too large, the tension can be reduced by shortening the length of the steel cable 5 at that end, thereby ensuring the balanced force at both ends of the bent cap support.

[0048] In one embodiment, there are two bridge piers 1, which are symmetrically arranged; the main frame assembly 3 includes a hoop 31, a steel pipe vertical pole 32, a drop block 33 and a middle truss 34; the hoop 31 is installed on any one of the bridge piers 1 by bolts, the steel pipe vertical pole 32 is installed on the side of any one of the hoops 31 away from the bridge pier 1, the drop block 33 is installed on the top of the steel pipe vertical 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 hoop 31, the hoop 31 is fixed on the bridge pier 1, and the middle truss 34 connects the two bridge piers 1; the hoop 31 is tightly installed on any one of the bridge piers 1 by bolts, ensuring a firm connection with the bridge pier 1, which is not only convenient for installation and disassembly, but also can effectively transfer the force from the support system; the steel pipe vertical pole 32 is installed on the side of the hoop 31 away from the bridge pier 1 as a vertical support structure, and the drop block 33 is installed on the top of the steel pipe vertical pole 32 to further disperse and transfer the force from the support system. The design of the drop block 33 also takes into account the adjustment requirements during the construction process and can be adjusted or disassembled conveniently when needed; the middle truss 34 is a key component connecting the two bridge piers 1. Its bottom is connected to the drop block 33 by bolts, and its top is fixed on the other bridge pier 1 by a hoop 31, enabling the middle truss 34 to stably span the two bridge piers 1 and 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 bridge piers 1. When the cantilever is subjected to an external load, 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 pipe vertical pole 32, they are finally dispersed to the two bridge piers 1. In this process, connecting components such as the hoop 31, the drop block 33 and the hoop 31 play a key role in ensuring the accurate transmission and dispersion of the force.

[0049] In one embodiment, the horizontal support 2 includes a cantilever truss 22, a distribution beam 23, triangular trusses 24 and a formwork 25; the cantilever truss 22 is connected to the middle truss 34 by screws, the distribution beam 23 is laid on the tops 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 bridge piers 1, and the formwork 25 is installed on the distribution beam 23 between the two triangular trusses 24.

[0050] A construction method for a large cantilever capping beam support includes the following steps

[0051] S1: Installation of the hoop 31. First, install half of the hoop 31 and then the remaining half. Use an electric wrench to tighten the bolts. During the installation process, adjust the concentricity between the hoop 31 and the pier 1. After installation, adjust the elevation of the two bottom load-bearing hoops 31 to be the same. This helps to accurately adjust the position and angle of the hoop 31, adjust the concentricity between the hoop 31 and the pier 1, ensure that the hoop 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 hoops 31 are the same, provide an accurate reference plane for subsequent installation, and ensure the verticality and horizontality of the entire support system.

[0052] S2: Installation of the steel pipe upright 32. Calculate the combined section length of the steel pipe upright 32 based on the elevation of the pier 1 by inverse calculation, and lay it flat on the ground for combined forming. Use an electric wrench to tighten the connecting bolts of the steel pipe upright 32. Use a crane to lift the horizontally placed steel pipe upright 32 to the vertical position and bring it close to the hoop 31. After the crane hoists the steel pipe upright 32 to a distance from the pier 1 and the hoop 31 of no more than 20 cm, lower the steel pipe upright 32 to the connecting position of the hoop 31. Calculate the combined section length of the steel pipe upright 32 based on the elevation of the pier 1 by inverse calculation to ensure that the designed height requirements can be met after the upright is installed. Conduct the combined forming of the steel pipe upright 32 on the ground, which is convenient for operation and quality control and reduces the risk of high-altitude operations.

[0053] S3: Installation of the drop block 33 and the middle truss 34. The drop block 33 is composed of 4 isosceles trapezoid-section supports on the top, bottom, left, and right. The drop block 33 is pre-assembled on the ground, and the nuts are tightened before the whole is hoisted. Lower the middle truss 34 onto the drop block 33 by a crane. Pre-assemble the drop block 33 on the ground and tighten the nuts to ensure that the drop block 33 will not loosen during the installation process, improve the installation efficiency, hoist the pre-assembled drop block 33 as a whole, reduce the amount of high-altitude operations, improve the installation safety, and accurately place the middle truss 34 on the drop block 33 by a crane to form a stable support structure.

[0054] S4: Installation of the cantilever truss 22;

[0055] S401: Installation of the single-side cantilever truss 22 on one side of a single lane;

[0056] S402: Installation of the single-side cantilever truss 22 on the opposite side of a single lane and installation of the cross bracing;

[0057] S403: Installation of the single-side cantilever truss 22 on one side of the remaining lane;

[0058] S404: Installation of the single-side cantilever truss 22 on the opposite side of the remaining lane;

[0059] Install the cantilever truss 22 in the order of one side of a single frame, the opposite side of a single frame, one side of the remaining frames, and the opposite side of the remaining frames to ensure the orderly progress of the installation process. After the installation of the cantilever truss 22 is completed, install the cross bracing in a timely manner to enhance the overall stability and stiffness of the truss. Install it step by step to facilitate the control of the installation quality and progress.

[0060] S5: Install the pulley mechanism and the detection component 62; install the gantry bracket, fix the detection component 62, then install the pulley mechanism on the installation platform 21, connect the steel cable 5 to the pulley mechanism and the detection component 62, and adjust the tension of the steel cable 5 through the detection component 62; by installing the pulley mechanism and the detection component 62, change the force direction of the large cantilever bracket, reduce the use and dependence on the ground support bracket, and at the same time save the construction time and cost of installing the ground bracket. By changing the force direction of the large cantilever bracket and pulling it to the pier 1 area through the pulley mechanism, the force on the entire pier 1 is concentrated and the structure is stable.

[0061] S6: Install the distribution beam 23 and the formwork 25 to evenly distribute the load to each support point, improve the bearing capacity of the overall structure, and install the formwork 25 according to the design requirements to provide accurate shape and dimensions for the subsequent concrete pouring.

[0062] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A large cantilever capping beam support, characterized in that It includes bridge piers, pulley mechanisms, horizontal brackets and main frame components; two of the said bridge piers are arranged on the bearing platform, the main frame components are detachably connected to the bridge piers, the horizontal brackets are erected on the tops of the bridge piers, and the main frame components support the horizontal brackets; an installation platform is detachably connected to the top of the horizontal brackets, and the pulley mechanisms are installed on the installation platform; The said pulley mechanisms include a first pulley component and a second pulley component; the first pulley component is installed at the end of the installation platform, the second pulley component is installed in the middle of the horizontal bracket, the first pulley component and the second pulley component are connected by a steel cable, the second pulley component is located above the first pulley component, the first pulley component changes the downward force direction of the bracket cantilever to upward, and the second pulley component is used to save the force magnitude of the bracket cantilever; The said second pulley component includes a gantry mounting seat, a second fixed pulley group and a movable pulley group; the gantry mounting seat is installed on the top of the horizontal bracket, the second fixed pulley group is fixedly installed at the bottom of the cross plate provided on the gantry mounting seat, the movable pulley group is slidably connected to the second fixed pulley group through the steel cable, the steel cable is first slidably connected to the second fixed pulley group and then connected to the movable pulley group, and extends from the movable pulley group to be fixedly connected to the adjusting mechanism installed on the top of the cross plate; The said adjusting mechanism includes a main control unit, a detection component, a first adjusting component and a second adjusting component; the detection component, the first adjusting component and the second adjusting component are all electrically connected to the main control unit; the first adjusting component and the second adjusting 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 movable pulley groups, the detection component uploads the height difference data to the main control unit, and the main control unit drives the first adjusting component or the second adjusting component to move according to the height difference data, so as to reduce the height difference between the two movable pulleys; The said detection component includes a distance measuring piece and a telescopic piece; both ends of the telescopic piece are respectively installed on the second fixed pulley group and the movable pulley group, the telescopic piece includes a fixed section and a movable section, the fixed section is fixedly installed on the second fixed pulley group, the movable section is fixedly installed 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 piece is installed on the two movable pulley groups and is used to detect the height difference between the two movable pulley groups.

2. The large cantilever capping beam support according to claim 1, wherein The number of the said pulley mechanisms is at least two groups.

3. The large cantilever bent cap support according to claim 1, wherein, The said first pulley component is a first fixed pulley group, and one end of the steel cable is fixed on the first fixed pulley group and bypasses the pulley of the first fixed pulley group to be connected to the second pulley component.

4. A large cantilever capping beam support according to claim 1, characterized in that, The said distance measuring piece 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 connecting rods, and the first detector and the second detector are slidably connected; both the first detector and the second detector are internally provided with displacement sensors.

5. The large cantilever bent cap support according to claim 4, characterized in that, The structures of the first adjustment component and the second adjustment component are the same. Both the first adjustment component and the second adjustment component include a lifting member and a winding member. The lifting member and the winding member are both installed on the top of the cross plate. The steel cable is connected from the movable pulley group to the lifting member 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.

6. The large cantilever bent cap bracket according to claim 1, wherein, There are two piers and they are symmetrically arranged; the main frame assembly includes a hoop, a profiled steel vertical pole, a dropping block and a middle truss; the hoop is installed on any one of the piers by bolts, the profiled steel vertical pole is installed on the side of any one of the hoops away from the pier, the dropping block is installed on the top of the profiled steel vertical pole, the bottom of the middle truss is connected to the dropping block by bolts, and the middle truss is used to connect the two piers.

7. A large cantilever capping beam support according to claim 6, 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 the two piers, and the formwork is laid between the triangular trusses on both sides.

8. A construction method for a large cantilever pier cap support, using the large cantilever pier cap support described in any one of claims 1-7, characterized in that, It includes the following steps: S1: Hoop installation. First install half of the hoop and then install the remaining half of the hoop. Use an electric wrench to tighten the bolts. Adjust the concentricity between the hoop and the pier during the installation process. After installation, adjust the elevation of the two bottom load-bearing hoops to be the same; S2: Profiled steel vertical pole installation. Calculate the combined section length of the profiled steel vertical pole according to the elevation of the pier and lay it flat on the ground for forming. Use an electric wrench to tighten the connection bolts of the profiled steel vertical pole. The vehicle hoists the horizontally placed profiled steel pier to the vertical and approaches the hoop; after the crane hoists the profiled steel vertical pole to a distance from the pier and the hoop of no more than 20 cm, lower the profiled steel vertical pole to the connection position of the hoop; S3: Dropping block and middle truss installation. The dropping block consists of 4 isosceles trapezoidal-section supports on the upper, lower, left and right sides. The dropping block is pre-assembled on the ground, and after locking the nuts, it is hoisted as a whole. The middle truss sheet is dropped onto the dropping block by a crane; S4: Cantilever truss installation; S401: Installation of the cantilever truss on one side of a single lane; S402: Installation of the cantilever truss on the opposite side of a single lane and installation of the cross connection; S403: Installation of the cantilever truss on one side of the remaining lane; S404: Installation of the cantilever truss on the opposite side of the remaining lane; S5: Installation of the pulley mechanism and the detection component; install the gantry support, install and fix the detection component, then install the pulley mechanism on the installation platform, connect the steel cable to the pulley mechanism and the detection component, and adjust the tension of the steel cable through the detection component; S6: Installation of the distribution beam and the formwork.

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