Self-replacement arch bridge suspender and cable force control method

Abstract

The application belongs to the technical field of bridge engineering, and particularly relates to a self-replacement arch bridge suspender and a cable force control method. The self-replacement arch bridge suspender comprises an upper hanging point and a lower hanging point, the top end of a middle suspender is hinged to the upper hanging point, the bottom end of the middle suspender is sleeved with a connecting block, hooks are symmetrically arranged on the two sides of the connecting block, and the hooks are respectively hooked with two groups of symmetrically arranged lifting rings at the lower hanging point; a section of the suspender body of the middle suspender extending from the connecting block is provided with an external thread section, and a fastening nut is threadedly matched with the external thread section; a cable force sensor for testing the cable force of the middle suspender on line is further arranged on the middle suspender; the load bearing structure of the arch bridge suspender is optimized, and the online cable force adjustment function of the arch bridge suspender during use can be realized, so that the normal service life of the arch bridge suspender can be ensured while the convenience of suspender replacement is improved, and the arch bridge suspender is flexible and convenient to use.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge engineering, and particularly relates to a self-replacement arch bridge suspender and a cable force control method. BACKGROUND

[0002] As the main load-bearing component of an arch bridge, a suspender is limited by material properties, processing technology, construction quality, operation maintenance and other reasons, and the actual service life is generally between 12 and 18 years; therefore, there is a need to replace the suspender multiple times during the service life of the bridge. City landscape bridges not only have the function of beautifying the city, but also often bear a large amount of traffic, and the length of time for suspender replacement work will inevitably affect the normal operation of city traffic. How to shorten the time required for suspender replacement and reduce the impact of arch bridge suspender replacement on city traffic is worth further studying. The complex arch rib design of city landscape bridges increases the difficulty of installing traditional suspender replacement devices and makes the angle and posture of the suspender changeable, further increasing the difficulty of installing and replacing the suspender of the arch bridge and making the arch bridge more prone to problems such as stress relaxation and uneven stress distribution during use. In addition, the current replacement of the suspender of the arch bridge mainly uses temporary suspenders or temporary hoisting devices, which generally have the problems of many procedures, slow work progress, long impact on normal traffic, large consumption of large hoisting equipment, inability to use some construction devices, and high construction cost. In view of the fact that frequent replacement of the suspender will consume considerable cost, it is also an important way to reduce the maintenance cost of the arch bridge to ensure the load-bearing property of the suspender during use, optimize the cable force, avoid the need to replace the suspender due to problems such as stress relaxation and uneven stress distribution, increase the service life of the suspender, and extend the normal working period. This is the focus of the present application. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a self-replacement arch bridge suspender which optimizes the load-bearing structure of the suspender of the arch bridge and can realize online cable force adjustment of the suspender of the arch bridge during use, thereby improving the convenience of suspender replacement while ensuring the normal service life of the suspender of the arch bridge and facilitating flexible use.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The utility model provides a self-replacement arch bridge suspender, characterized by comprising upper hanging point for fixing on arch rib and lower hanging point fixed on bridge floor system steel beam, the top of intermediate suspender is hinged to upper hanging point, the bottom of intermediate suspender is sleeved with connecting block, and the both sides of connecting block are symmetrically provided with hooks to form hooking cooperation with two groups of symmetrically arranged lifting eyes at lower hanging point, thereby limiting the upward movement of connecting block relative to lower hanging point, the section of suspender of intermediate suspender beyond connecting block is provided with external thread section, and the external thread section is threadedly matched with fastening nut, thereby limiting the upward movement of intermediate suspender relative to connecting block, and a cable force sensor for testing the cable force of intermediate suspender is arranged on intermediate suspender.

[0006] Preferably, the lower hanging point comprises a lower lug plate directly fixed on the bridge floor system steel beam, the bottom of the lower pull rod is hinged to the lower lug plate, and the top of the lower pull rod is provided with the lifting eye; the lower pull rod is two and is arranged in axial symmetry along the axis of the intermediate suspender.

[0007] Preferably, the lower lug plate comprises a bottom plate and a vertical plate arranged on the bottom plate, and the vertical plate and the bottom plate intersect with each other; the vertical plate constitutes a hinge plate for hinging the lower pull rod, and the two are hinged to each other through a lower pin shaft.

[0008] Preferably, the upper hanging point comprises an upper lug plate directly fixed on the arch rib, and the top of the intermediate suspender is coaxially provided with a fork lug, the fork lug and the upper lug plate are inserted into each other and hinged to each other through an upper pin shaft.

[0009] Preferably, a scale is arranged at the suspender body of the intermediate suspender.

[0010] Preferably, the cable force sensor is a magnetic flux sensor.

[0011] Preferably, the cable force control method is applied to the self-replacement arch bridge suspender, and when the intermediate suspender is maintained, the cable force is adjusted by tightening the fastening nut, and the number of rotations of the fastening nut is calculated by the following formula:

[0012]

[0013] In the formula:

[0014] n is the number of rotations of the fastening nut;

[0015] F is the cable force adjustment value, which is obtained by subtracting the reading of the current cable force sensor from the rated cable force value of the intermediate suspender;

[0016] L is the available length of the intermediate suspender;

[0017] p is the thread pitch of the external thread section of the intermediate suspender;

[0018] E is the elastic modulus of the intermediate suspender;

[0019] S is the cross-sectional area of the intermediate suspender.

[0020] The present application has the beneficial effects of:

[0021] 1) The traditional suspender direct tension operation mode is abandoned, and a convenient and detachable suspender structure is used. On the one hand, by adopting a detachable intermediate suspender, the convenient detachability is ensured by the cooperation of the hook and the lifting ring during use, and the suspender force bearing structure is further optimized relying on the symmetrical layout of the lower lifting points. At the same time, the problem of complicated ordinary arch bridge suspender replacement and maintenance is solved, the installation and replacement of the intermediate suspender can be quickly carried out, the influence of arch bridge maintenance on urban traffic is reduced, the cost of arch bridge suspender replacement is reduced, and the suspender is suitable for various forms of arch bridge. On the other hand, the combination structure of the fastening nut and the connecting block is added at the bottom end of the intermediate suspender. The connecting block forms the assembly base of the lifting ring and the hook at the same time, and relying on the cooperation of the fastening nut and the cable force sensor, the real-time compensation of the tensile stress of the intermediate suspender is realized, the stress relaxation problem of the arch bridge suspender is prevented, so that the convenient replacement of the intermediate suspender is improved, and the normal service life of the arch bridge suspender is also ensured, which is flexible and convenient to use.

[0022] 2) On the basis of the above structure, the present application further proposes a cable force optimization control method, which can simply and conveniently realize the optimization calculation of the cable force, is more suitable for on-site single-person rapid operation, has lower threshold, and can effectively ensure and even prolong the service life of the arch bridge suspender, and the effect is remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0024] Figure 2 and Figure 3 is a structure side view of two embodiments of the present application;

[0025] Figure 4 is a front view of the present application;

[0026] Figure 5 is a lock release state diagram of the hook and the lifting ring;

[0027] Figure 6 is an exploded view of the structure of the present application.

[0028] The actual correspondence between the various designations and component names of the present application is as follows:

[0029] 10 - upper lifting point; 11 - upper ear plate; 12 - upper pin shaft;

[0030] 20 - lower lifting point; 21 - lifting ring; 22 - lower ear plate; 23 - lower pull rod; 24 - lower pin shaft;

[0031] 30 - intermediate boom; 31 - externally threaded section; 32 - scale;

[0032] 40 - connecting block; 41 - hook;

[0033] 51 - fastening nut; 52 - cable force sensor. DETAILED DESCRIPTION

[0034] For the sake of better understanding, the specific structure and working mode of the present application are described as follows: Figures 1-6 , the specific structure and working mode of the present application are described as follows:

[0035] The specific embodiment of the present application is constructed with reference to Figures 1-6 , including intermediate boom 30, lower boom 23, connecting block 40, cable force sensor 52, cable force control structure, upper lifting point 10 and lower lifting point 20. In this embodiment, it can be considered that the arch bridge boom is divided into two parts, part of which forms intermediate boom 30, and the other part is replaced by extended lower boom 23; during operation, the core bearing and replacement area is intermediate boom 30, which can be quickly replaced by contacting the connecting part of intermediate boom 30 and lower boom 23.

[0036] When designing, as shown in Figure 1 , intermediate boom 30 can adopt epoxy sprayed parallel steel wire boom, damping device is arranged in the boom steel casing, intermediate boom 30 adopts double-layer HDPE sheath, and PVF adhesive tape is used for corrosion prevention design. The top of intermediate boom 30 is arranged with upper fork ear, and is connected with upper ear plate 11 at upper lifting point 10 through upper pin shaft 12. The bottom of intermediate boom 30 is tensioning end, the bottom is provided with externally threaded section 31, and is connected with connecting block 40 through fastening nut 51. The rotation of the matched fastening nut 51 can realize the rapid tensioning of intermediate boom 30. The middle and lower sections of the shaft body of intermediate boom 30 are drawn with auxiliary scale 32, which is used for recording the tensioning condition of intermediate boom 30, so as to speed up the replacement efficiency of intermediate boom 30.

[0037] Lower boom 23 is a steel member, which is made of high-strength steel, and is provided with lifting ring 21 at the upper end for fixing with hook 41 at connecting block 40, and is provided with fork ear structure at the bottom, that is, the bottom is provided with lower fork ear. The lower fork ear is connected with lower ear plate 22 at lower lifting point 20 through lower pin shaft 24. Each set of the present application has two lower booms 23.

[0038] Connecting block 40 is a steel member, which is made of high-strength steel, and is provided with a circular hole in the center for intermediate boom 30 to pass through, and is provided with two hooks 41 at the side for hooking lower boom 23, with reference to Figure 1 .

[0039] The cable force sensor 52 can adopt a magnetic flux sensor, which is installed above the connecting block 40 during use, used for real-time monitoring of the overall suspender cable force, and assisting the corresponding control device to complete cable force control and optimization. The cable force control structure is composed of the fastening nut 51, the outer threaded section 31, the connecting block 40 and the like, and the suspender cable force of the intermediate suspender 30 is changed by adjusting the fastening nut 51.

[0040] Further, referring to Figures 1-6 The upper hanging point 10 includes an upper lug plate 11, an upper gusset plate, an upper stiffening rib and the like, and is fixed to the arch rib by welding. The lower hanging point 20 includes a lower lug plate 22, a lower gusset plate, a lower stiffening rib and the like, and is fixed to the bridge deck system steel beam by welding. As shown in Figures 2-3 The lower hanging point 20 can be processed into different inclination angles according to the arch rib out-inclination or in-inclination, and the axis of the intermediate suspender 30 is kept consistent.

[0041] On the basis of the above structure, the installation method of the present application comprises the following steps:

[0042] S1, the installation of each hanging point is completed in a component prefabrication factory or a construction site, and the required parts are transported to the designated position when the installation of the arch bridge suspender starts.

[0043] S2, the lower fork lug of the lower pull rod 23 is inserted into the lower pin shaft 24 by passing through the lower hanging point 20.

[0044] S3, the upper fork lug of the intermediate suspender 30 is inserted into the upper pin shaft 12 by passing through the upper hanging point 10, and the connecting piece is inserted into the intermediate suspender 30, and the fastening nut 51 is screwed to complete the preliminary fixation.

[0045] S4, after the height of the hook 41 of the connecting block 40 is adjusted to be consistent with the height of the lifting ring 21 at the lower pull rod 23, the hook 41 is passed through the lifting ring 21 by rotating the lower pull rod 23, as shown in Figures 4-5 .

[0046] S5, the fastening nut 51 is further tightened, the connecting block 40 is moved upward, and the hook 41 is hooked tightly to the lower pull rod 23.

[0047] S6, the fastening nut 51 is further tightened by hydraulic device assistance, and the tensioning of the arch bridge suspender is completed.

[0048] S7, the scale value at the intermediate suspender 30 after tensioning to the predetermined value is recorded, so as to maintain the use of the arch bridge suspender, and the installation of the arch bridge suspender is completed.

[0049] The replacement process of the intermediate suspender 30 comprises the following steps:

[0050] S1, the fastening nut 51 is loosened, the connecting block 40 is lowered, the height of the connecting block 40 is adjusted, and the hook 41 is leveled with the lifting ring 21 at the lower pull rod 23.

[0051] S2, rotate the lower pull rod 23 to pass the hook 41 through the lifting ring 21, complete the disengagement of the intermediate suspender 30 and the lower pull rod 23, as shown in Figure 5 .

[0052] S3, remove the connecting piece from the original intermediate suspender 30, and then remove the intermediate suspender 30.

[0053] S4, pass the upper fork ear of the new intermediate suspender 30 through the upper lifting point 10 and insert it into the upper pin shaft 12; pass the connecting piece through the new intermediate suspender 30, and screw the fastening nut 51 to complete the preliminary fixation.

[0054] S5, adjust the fastening nut 51 so that the height of the hook 41 of the connecting block 40 is consistent with the height of the lifting ring 21 at the lower pull rod 23, and then rotate the lower pull rod 23 to pass the hook 41 through the lifting ring 21.

[0055] S6, further tighten the fastening nut 51 to move the connecting block 40 upward and tighten the lower pull rod 23 with the hook 41.

[0056] S7, further tighten the fastening nut 51 with the aid of hydraulic devices to complete the tensioning of the arch bridge suspender and complete the replacement of the intermediate suspender 30.

[0057] After the above installation and before replacement, the real-time compensation of the tensile stress at the intermediate suspender 30 can be realized through frequent maintenance operations to prevent the stress relaxation problem of the arch bridge suspender, thereby ensuring the normal service life of the arch bridge suspender, as follows:

[0058] When maintaining the intermediate suspender 30, the cable force is adjusted by tightening the fastening nut 51, and the number of rotations of the fastening nut 51 is calculated by the following formula:

[0059]

[0060] In the formula:

[0061] n is the number of rotations of the fastening nut 51;

[0062] F is the cable force adjustment value, which is obtained by subtracting the reading of the current cable force sensor 52 from the rated cable force value of the intermediate suspender 30;

[0063] L is the available segment length of the intermediate suspender 30; the available segment of the intermediate suspender 30 is the length of the suspender body between the top end and the fastening nut 51, that is, the length of the tensioning segment of the intermediate suspender 30 in actual work.

[0064] p is the thread pitch of the external thread segment 31 at the intermediate suspender 30;

[0065] E is the elastic modulus of the intermediate suspender 30;

[0066] S is the cross-sectional area of the intermediate suspender 30.

[0067] So far, the technical advantages generated by the present application are as follows:

[0068] a. The present application proposes an easily replaceable suspender structure, which is simple in structure, easy to install and replace, not only reduces the difficulty of installing the suspender of the arch bridge, but also can realize the quick replacement of the intermediate suspender 30, effectively shortens the time and the number of labor and equipment required for replacing the suspender of the arch bridge, reduces the influence of replacing the suspender of the arch bridge on urban traffic, and reduces the construction cost of replacing the suspender of the arch bridge.

[0069] b. The suspender structure proposed by the present application is simple, flexible in arrangement, safe and reliable, its installation and maintenance method is easy to operate, can be flexibly installed according to the cross-sectional shape of the arch rib, is widely applicable to various special-shaped arch bridge structures, reduces the difficulty of installing and replacing the suspender of the special-shaped arch bridge, reduces the requirements of the site and equipment for installing and replacing the suspender of the special-shaped arch bridge, helps to solve the problems of difficult replacement and high replacement cost of the suspender of the special-shaped arch bridge, reduces the construction risk of replacing the suspender of the special-shaped arch bridge, and expands the application range of such arch bridge.

[0070] c. The suspender installation method provided by the present application is simple to operate, has lower requirements for installation space, is beneficial to the installation work in the complex structure system of the special-shaped arch bridge, requires less labor and equipment for installation, and has lower installation cost.

[0071] d. The present application adopts a new PVF adhesive tape corrosion prevention design, which can effectively prevent rainwater and the like from penetrating into the PE sleeve, and at the same time isolate the erosion of ozone and ultraviolet rays to the HDPE, thereby reducing the problem of stress cracking of the HDPE outer protective sleeve under the influence of ozone, rainwater, acid and alkali, and ultraviolet rays in the high stress and vibration working conditions of the suspender of the arch bridge, and further greatly improving the durability of the suspender of the arch bridge and prolonging the service life of the suspender of the arch bridge.

[0072] e. The cable force control structure proposed by the present application can cooperate with the magnetic flux cable force sensor 52 to monitor the cable force in real time during the use of the arch bridge, and compensate the cable force in time when the cable force decreases; the cable force control structure proposed by the present application is simple to operate, does not need to remove the arch bridge structure when adjusting the cable force, does not need to set up a temporary structure, and does not affect the normal use of the arch bridge; the present application can simply realize the cable force control of the arch bridge, effectively prolong the service life of the suspender of the arch bridge, and reduce the cost of maintaining the arch bridge.

[0073] f. The present application has simple and beautiful structure, unique modeling, in addition to the above functional advantages, can also be used as a decoration to increase the beauty and uniqueness of the arch bridge, broaden the application scene of the steel arch bridge, and the effect is remarkable.

[0074] Of course, the present application is not limited to the details of the above-described exemplary embodiments but comprises the same or similar structures which can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended that all changes which come within the meaning and range of equivalency of the claims are embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0075] Furthermore, it should be understood that although the description is made on the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and the skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments which can be understood by the skilled in the art.

[0076] The technologies, shapes, and structural parts not described in detail in the present application are well-known technologies.

Claims

1. A self-replacing arch bridge hanger, characterized in that: It includes an upper suspension point (10) for fixing to the arch rib and a lower suspension point (20) for fixing to the bridge deck steel beam. The top of the intermediate suspension rod (30) is hinged to the upper suspension point (10). The bottom of the intermediate suspension rod (30) is fitted with a connecting block (40). Hooks (41) are symmetrically arranged on both sides of the connecting block (40), so as to form a hook engagement with two sets of symmetrically arranged lifting rings (21) at the lower suspension point (20), thereby restricting the connecting block (40) from moving upward relative to the lower suspension point (20). A section of the intermediate suspension rod (30) extending out of the connecting block (40) is provided with an external thread section (31), and a fastening nut (51) is threaded at the external thread section (31), thereby restricting the intermediate suspension rod (30) from moving upward relative to the connecting block (40). A cable force sensor (52) for online testing of the cable force of the intermediate suspension rod (30) is also arranged on the intermediate suspension rod (30).

2. The self-replacing arch bridge hanger according to claim 1, characterized in that: The lower suspension point (20) includes a lower ear plate (22) directly fixed to the steel beam of the bridge deck, the bottom of the lower pull rod (23) is hinged to the lower ear plate (22), and the top of the lower pull rod (23) is provided with the lifting ring (21); the lower pull rod (23) consists of two rods and is symmetrically arranged along the axis of the middle suspension rod (30).

3. A self-replacing arch bridge hanger according to claim 2, characterized in that: The lower ear plate (22) includes a base plate and a vertical plate arranged on the base plate, the vertical plate and the base plate intersecting each other; the vertical plate constitutes a hinge plate for hinged pull rod (23) and the two are hinged to each other by a lower pin (24).

4. A self-replacing arch bridge hanger according to claim 2 or 3, characterized in that: The upper suspension point (10) includes an upper ear plate (11) directly fixed to the arch rib, and a fork ear is coaxially installed at the top of the middle suspension rod (30). The fork ear and the upper ear plate (11) are inserted into each other and hinged to each other by the upper pin (12).

5. A self-replacing arch bridge hanger according to claim 1, 2, or 3, characterized in that: A scale (32) is set on the body of the intermediate rod (30).

6. A self-replacing arch bridge hanger according to claim 1, 2, or 3, characterized in that: The cable force sensor (52) is a magnetic flux sensor.

7. Cable tension control method, which is applied... A self-replacing arch bridge hanger as described in claim 1, characterized in that: When maintaining the intermediate suspension rod (30), the cable tension is adjusted by tightening the fastening nut (51). The number of rotations required to tighten the fastening nut (51) is calculated using the following formula: In the formula: n The number of rotations required to tighten the nut (51); F The cable force adjustment value is obtained by subtracting the current cable force sensor (52) reading from the rated cable force value of the intermediate boom (30); L The usable length of the intermediate hanger (30) is the length of the rod body of the intermediate hanger (30) from the top to the fastening nut (51); p The thread pitch of the external thread section (31) at the intermediate hanger (30); E The elastic modulus of the intermediate hanger (30); S The cross-sectional area of ​​the intermediate hanger (30) is given.

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