CN116446262A - Self-replacement arch bridge suspender and cable force control method - Google Patents
Self-replacement arch bridge suspender and cable force control method Download PDFInfo
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- CN116446262A CN116446262A CN202310288473.5A CN202310288473A CN116446262A CN 116446262 A CN116446262 A CN 116446262A CN 202310288473 A CN202310288473 A CN 202310288473A CN 116446262 A CN116446262 A CN 116446262A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 17
- 238000010276 construction Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Architecture (AREA)
- Civil Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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- Bridges Or Land Bridges (AREA)
Abstract
The invention 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 suspension point and a lower suspension point, wherein the top end of a middle suspender is hinged at the upper suspension point, the bottom end of the middle suspender is sleeved with a connecting block, and lifting hooks are symmetrically arranged on two sides of the connecting block, so that hooking cooperation is formed between the two groups of symmetrically arranged lifting rings at the lower suspension point respectively; a section of the rod body of the middle suspender, which extends out of the connecting block, is provided with an external thread section, and a fastening nut is in threaded fit with the external thread section; a cable sensor for testing the cable force of the middle suspender on line is also arranged on the middle suspender; the device optimizes the bearing structure of the arch bridge suspender and can realize the online cable force adjusting function of the arch bridge suspender in the use process, thereby improving the convenience of replacing the suspender and simultaneously ensuring the normal service life of the arch bridge suspender and being flexible and convenient to use.
Description
Technical Field
The invention 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
The suspender is used as a main bearing member of the arch bridge and is limited by various reasons such as material characteristics, processing technology, construction quality, operation maintenance and the like, and the actual service life is approximately between 12 and 18 years; therefore, there is a need to replace the boom multiple times during the life of the bridge. The urban landscape bridge not only has the function of beautifying the city, but also often bears larger traffic flow, the time of boom replacement operation can influence the normal running of the city traffic, how to shorten the time required by boom replacement and reduce the influence of arch bridge boom replacement on the urban traffic is worth deeply researching. The complicated arch rib design of urban landscape bridge lets traditional jib change device installation degree of difficulty increase on the one hand, and on the other hand lets jib angle gesture be rich in the change again, has further improved the installation of arch bridge jib and has changed the degree of difficulty, also makes the arch bridge appear stress relaxation more easily in the use, problem such as stress distribution inequality. In addition, the replacement of the existing arch bridge suspender mainly uses a temporary suspender or a temporary pocket suspending device, and also has the problems of more working procedures, slow operation progress, long traffic normal running time influence, large consumption of a large-scale lifting device for a station shift, incapability of turnover use of part of construction devices and higher construction cost. In view of the fact that frequent replacement of the hanger rod inevitably consumes considerable cost, the bearing performance of the hanger rod is ensured in the use process, optimization of cable force is achieved, the hanger rod is prevented from being replaced due to the problems of stress relaxation, uneven stress distribution and the like, the service life of the hanger rod and the normal working period are prolonged, and the hanger rod is obviously an important way for reducing the maintenance cost of an arch bridge, and the hanger rod is the key point of research of the invention.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a self-replacement arch bridge suspender which optimizes the bearing structure of the arch bridge suspender and can realize the online cable force adjusting function of the arch bridge suspender in the use process, thereby improving the convenience of replacing the suspender and simultaneously ensuring the normal service life of the arch bridge suspender and being flexible and convenient to use.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a self-replacing arch bridge boom, characterized by: the lifting device comprises an upper lifting point fixed on an arch rib and a lower lifting point fixed on a bridge deck steel girder, wherein the top end of a middle lifting rod is hinged at the upper lifting point, the bottom end of the middle lifting rod is sleeved with a connecting block, and lifting hooks are symmetrically arranged on two sides of the connecting block, so that hooking cooperation is formed between the connecting block and two groups of lifting rings symmetrically arranged at the lower lifting point respectively, and further the connecting block is limited to do upward movement relative to the lower lifting point; an external thread section is arranged on a section of the rod body of the middle suspender, which extends out of the connecting block, and a fastening nut is in threaded fit with the external thread section, so that the middle suspender is limited to move upwards relative to the connecting block; the intermediate boom is further provided with a cable sensor for testing cable force of the intermediate boom on line.
Preferably, the lower suspension point comprises a lower lug plate directly fixed on a bridge deck system steel beam, the bottom of the lower pull rod is hinged on the lower lug plate, and the top of the lower pull rod is provided with the suspension ring; the number of the lower pull rods is two, and the lower pull rods are symmetrically arranged along the axis of the middle suspender.
Preferably, the lower ear plate comprises a bottom plate and a vertical plate arranged on the bottom plate, and the vertical plate and the bottom plate are intersected with each other; the vertical plates form a hinged plate for hinging the lower pull rod, and the two plates are hinged with each other through a lower pin shaft.
Preferably, the upper hanging point comprises an upper lug plate directly fixed on the arch rib, the top end of the middle hanging rod is coaxially provided with a fork lug, and the fork lug and the upper lug plate are inserted into each other and hinged with each other through an upper pin shaft.
Preferably, the rod body of the middle suspender is provided with scales.
Preferably, the cable sensor is a magnetic flux sensor.
Preferably, the cable force control method is applied to the self-replacement arch bridge suspender, and is characterized in that: when the maintenance of the middle suspender is carried out, the cable force is adjusted by a method of screwing the fastening nut, and the required rotation cycle number of the fastening nut is calculated by the following formula:
wherein:
n is the number of required rotation cycles of the fastening nut;
f is a cable force adjusting value, and is obtained by subtracting the reading of the current cable force sensor from the rated cable force value of the middle suspender;
l is the available section length of the intermediate boom;
p is the thread pitch of the external thread section at the middle suspender;
e is the elastic modulus of the middle suspender;
s is the cross-sectional area of the intermediate boom.
The invention has the beneficial effects that:
1) The operation mode that traditional jib is directly to drawing has been abandoned, has used a convenient dismantled and assembled jib structure instead, on the one hand, through adopting dismantled and assembled middle jib, during the use, relies on the cooperation of lifting hook and rings to guarantee its convenient detachability to rely on the lower hoisting point of symmetry overall arrangement to further optimize jib load-carrying structure. Meanwhile, the problem that the replacement and maintenance of the common arch bridge suspender are complicated is solved, the installation and the replacement of the middle suspender can be rapidly carried out, the influence of arch bridge maintenance on urban traffic is reduced, the replacement cost of the arch bridge suspender is reduced, and the method is suitable for arch bridges in various forms. On the other hand, the combined structure of the fastening nut and the connecting block is additionally arranged at the bottom end of the middle suspender, the connecting block is matched with the cable force sensor by the fastening nut while forming the assembly matrix of the suspension ring and the lifting hook, so that the real-time compensation of the tensile stress at the middle suspender is realized, the stress relaxation problem of the arched bridge suspender is prevented, and the normal service life of the arched bridge suspender can be ensured while the convenience of replacing the middle suspender is improved, and the use is flexible and convenient.
2) On the basis of the structure, the invention further provides an optimal control method for the cable force, which can simply and conveniently realize the optimal calculation of the cable force, is more suitable for on-site single person rapid operation, has lower threshold, can effectively ensure and even prolong the service life of the arch bridge suspender, and has remarkable effect.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIGS. 2 and 3 are structural side views of two embodiments of the present invention;
FIG. 4 is a front view of the present invention;
FIG. 5 is a diagram showing the unhooked state of the hook and sling;
fig. 6 is an exploded view of the structure of the present invention.
The actual correspondence between each label and the component name of the invention is as follows:
10-lifting points; 11-upper ear plate; 12-upper pin shaft;
20-a lower hanging point; 21-hanging rings; 22-lower ear plate; 23-lower pull rod; 24-lower pin shaft;
30-middle a boom; 31-an external thread segment; 32-scale;
40-connecting blocks; 41-lifting hook;
51-tightening the nut; 52-cable sensor.
Detailed Description
For ease of understanding, the specific structure and operation of the present invention will be further described herein with reference to FIGS. 1-6:
the construction of an embodiment of the present invention is shown with reference to fig. 1-6, and includes an intermediate boom 30, a lower boom 23, a connection block 40, a cable sensor 52, a cable force control structure, an upper suspension point 10, and a lower suspension point 20. In this embodiment, it can be seen that the arch bridge boom is bifurcated, partially forming an intermediate boom 30, and the other portion is replaced by an elongated lower boom 23; during operation, the core bearing and replacing area is the middle suspender 30, and the replacement of the middle suspender 30 can be completed rapidly by contacting the joint of the middle suspender 30 and the lower pull rod 23.
In design, as shown in fig. 1, the middle suspender 30 can be an epoxy spraying parallel steel wire suspender, a damping device is arranged in a suspender steel casing, the middle suspender 30 adopts a double-layer HDPE sheath, and a PVF adhesive tape corrosion prevention design is adopted. The top end of the middle suspender 30 is provided with an upper fork lug and is connected with an upper lug plate 11 at the upper suspension point 10 through an upper pin shaft 12. The bottom end of the middle suspender 30 is a tensioning end, and the bottom end is provided with an external thread section 31 and is connected with the connecting block 40 through a fastening nut 51. The matched fastening nut 51 is rotated to realize the rapid tensioning of the middle suspender 30. The middle lower section of the shaft of the middle boom 30 is drawn with an auxiliary scale 32 for recording the tension condition of the middle boom 30 to accelerate the replacement efficiency of the middle boom 30.
The lower pull rod 23 is a steel member and is made of high-strength steel, the upper end of the lower pull rod is provided with a hanging ring 21 for being fixed with a hanging hook 41 at the connecting block 40, and the bottom end of the lower pull rod is of a fork lug structure, namely, the bottom end of the lower pull rod is provided with a lower fork lug. The lower fork lugs are connected with the lower lug plate 22 at the lower hanging point 20 through the lower pin shaft 24. In each set of the invention, there are two lower pull rods 23.
The connecting block 40 is a steel member made of high-strength steel, and has a circular hole in the center for the middle boom 30 to pass through, and two hooks 41 on the sides for hooking the lower tie rod 23, as shown in fig. 1.
The cable force sensor 52 can be a magnetic flux sensor, and is installed above the connecting block 40 in use, so as to monitor the cable force of the whole hanging rod in real time and assist the corresponding control device to complete cable force control and optimization. The cable force control structure consists of a fastening nut 51, an external thread section 31, a connecting block 40 and the like, and the cable force of the middle suspender 30 is changed by adjusting the fastening nut 51.
Further, as shown with reference to fig. 1-6, the upper suspension point 10 includes an upper ear plate 11, an upper pad, an upper stiffener, etc., and is fixed to the rib by welding. The lower suspension points 20 include lower lugs 22, lower backing plates, lower stiffeners, etc., which are secured to the deck system steel beams by welding. As shown in fig. 2-3, the lower suspension point 20 may be machined to different angles of inclination depending on whether the rib is camber or toe-in, consistent with the center boom 30 axis.
On the basis of the above structure, the installation method of the invention comprises the following steps:
s1, finishing the installation of each lifting point in a component prefabrication factory or a construction site, and conveying required parts to a set position when the arch bridge suspender is installed.
S2, enabling a lower fork lug of the lower pull rod 23 to penetrate through the lower hanging point 20 and inserting the lower pin shaft 24.
S3, enabling an upper fork lug at the middle suspender 30 to pass through the upper hanging point 10 and insert an upper pin shaft 12; the connector is passed through the intermediate boom 30 and the fastening nut 51 is screwed on to complete the preliminary fixation.
S4, adjusting the fastening nut 51 to enable the height of the lifting hook 41 of the connecting block 40 to be identical with that of the lifting ring 21 at the lower pull rod 23, and rotating the lower pull rod 23 to enable the lifting hook 41 to penetrate through the lifting ring 21, as shown in fig. 4-5.
S5, further tightening the fastening nut 51 to enable the connecting block 40 to move upwards, and enabling the lifting hook 41 to hook the lower pull rod 23.
S6, the fastening nut 51 can be further screwed through the assistance of a hydraulic device, and tensioning of the arch bridge suspender is completed.
And S7, recording a scale value of the middle suspender 30 stretched to a preset value so as to maintain the use of the arch bridge suspender and finish the installation of the arch bridge suspender.
The replacement process of the intermediate boom 30 includes the steps of:
s1, unscrewing the fastening nut 51, enabling the connecting block 40 to descend, adjusting the height of the connecting block 40, and enabling the lifting hook 41 to be flush with the lifting ring 21 at the lower pull rod 23.
S2, rotating the lower pull rod 23 to enable the lifting hook 41 to penetrate through the lifting ring 21, and completing the separation of the middle lifting rod 30 and the lower pull rod 23, as shown in fig. 5.
S3, removing the connecting piece from the original middle suspender 30, and then removing the middle suspender 30.
S4, inserting an upper fork lug of the new middle suspender 30 into the upper pin shaft 12 through the upper suspension point 10; the connecting member is passed through the new intermediate boom 30 and the fastening nut 51 is screwed on to complete the preliminary fixation.
S5, adjusting the fastening nut 51 to enable the height of the lifting hook 41 of the connecting block 40 to be consistent with that of the lifting ring 21 at the lower pull rod 23, and rotating the lower pull rod 23 to enable the lifting hook 41 to penetrate through the lifting ring 21.
S6, further screwing the fastening nut 51 to enable the connecting block 40 to move upwards, and the lifting hook 41 tightens the lower pull rod 23.
S7, the fastening nut 51 can be further screwed through the assistance of a hydraulic device, so that tensioning of the arch bridge suspender is completed, and replacement of the intermediate suspender 30 is completed.
And after the installation, before the replacement, the real-time compensation of the tensile stress at the middle suspender 30 can be realized through multiple maintenance operations, and the stress relaxation problem of the arch bridge suspender is prevented, so that the normal service life of the arch bridge suspender is ensured, and the method specifically comprises the following steps:
when the maintenance of the intermediate boom 30 is performed, the cable force is adjusted by tightening the tightening nut 51, and the number of rotations required for the tightening nut 51 is calculated by the following formula:
wherein:
n is the number of required rotations of the fastening nut 51;
f is a cable force adjustment value obtained by subtracting the current cable force sensor 52 reading from the rated cable force value of the intermediate boom 30;
l is the available section length of the intermediate boom 30; the usable section of the intermediate boom 30, i.e. the length of the shaft of the intermediate boom 30 from the tip to the fastening nut 51, i.e. the length of the load-carrying section of the intermediate boom 30 in actual operation.
p is the thread pitch of the external thread segment 31 at the intermediate boom 30;
e is the modulus of elasticity of the intermediate boom 30;
s is the cross-sectional area of the intermediate boom 30.
The technical advantages produced by the invention are as follows:
a. the boom structure easy to replace, provided by the invention, has the advantages of simple structure and convenience in installation and replacement, reduces the installation difficulty of the arch bridge boom, can realize the quick replacement of the middle boom 30, can effectively shorten the time and the number of manpower and equipment required by the replacement of the arch bridge boom, reduces the influence of the replacement of the arch bridge boom on urban traffic, and reduces the construction cost of the replacement of the arch bridge boom.
b. The hanger rod provided by the invention has the advantages of simple structure, flexible arrangement, safety and reliability, and the installation and maintenance method is easy to operate, can be flexibly installed according to the change form of the cross section of the arch rib, is widely applicable to various special-shaped arch bridge structures, reduces the installation and replacement difficulty of the hanger rod of the special-shaped arch bridge, reduces the requirements of the installation and replacement of the hanger rod of the special-shaped arch bridge on sites and equipment, is beneficial to solving the problems of difficult replacement and high replacement cost of the hanger rod of the special-shaped arch bridge, reduces the construction risk during the replacement of the hanger rod of the special-shaped arch bridge, and expands the application range of the special-shaped arch bridge.
c. The boom installation method provided by the invention is simple and convenient to operate, has lower requirement on installation space, is beneficial to carrying out installation work in a complex structural system of the special-shaped arch bridge, and has less labor and equipment required for installation and lower installation cost.
d. The novel PVF adhesive tape corrosion prevention design is adopted, rainwater and the like can be effectively prevented from penetrating into the PE sleeve, meanwhile, erosion of ozone, ultraviolet rays and the like to HDPE is isolated, so that the problem that the HDPE outer sheath pipe is subjected to stress cracking due to the influence of ozone, rainwater, acid and alkali and ultraviolet rays on the arch bridge suspender under the high-stress and vibration working conditions is solved, the durability of the arch bridge suspender is greatly improved, and the service life of the arch bridge suspender is prolonged.
e. The cable force control structure provided by the invention can be matched with the magnetic flux cable force sensor 52, so that the cable force is monitored in real time in the use process of the arch bridge, and cable force compensation is performed in time when the cable force is reduced; the cable force control structure provided by the invention is simple and convenient to operate, the arch bridge structure is not required to be dismantled when the cable force is regulated, a temporary structure is not required to be erected, and the normal use of the arch bridge is not influenced; the invention can simply and conveniently realize the cable force control of the arch bridge, effectively prolong the service life of the arch bridge suspender and reduce the maintenance cost of the arch bridge.
f. The invention has simple and beautiful structure and unique shape, can be used as an ornament to increase the beauty and uniqueness of the arch bridge besides the functional advantages, widens the application scene of the steel arch bridge and has remarkable effect.
It will be understood by those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but includes other specific forms of the same or similar structures that may be embodied without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (7)
1. A self-replacing arch bridge boom, characterized by: the lifting device comprises an upper lifting point (10) fixed on an arch rib and a lower lifting point (20) fixed on a bridge deck steel beam, wherein the top end of a middle lifting rod (30) is hinged to the upper lifting point (10), the bottom end of the middle lifting rod (30) is sleeved with a connecting block (40), lifting hooks (41) are symmetrically arranged on two sides of the connecting block (40), so that hooking cooperation is formed between the connecting block and two groups of lifting rings (21) symmetrically arranged on the lower lifting point (20), and further the connecting block (40) is limited to act upwards relative to the lower lifting point (20); an external thread section (31) is arranged on a section of the rod body of the middle suspender (30) extending out of the connecting block (40), and a fastening nut (51) is in threaded fit with the external thread section (31), so that the middle suspender (30) is limited to move upwards relative to the connecting block (40); a cable sensor (52) for testing the cable force of the intermediate boom (30) on line is also arranged on the intermediate boom (30).
2. A self-replacing arch bridge boom as recited in claim 1, wherein: the lower suspension point (20) comprises a lower lug plate (22) directly fixed on a bridge deck system steel beam, the bottom of a lower pull rod (23) is hinged on the lower lug plate (22), and the top of the lower pull rod (23) is provided with the suspension ring (21); the number of the lower pull rods (23) is two, and the lower pull rods are symmetrically arranged along the axis of the middle suspender (30).
3. A self-replacing arch bridge boom as recited in claim 2, wherein: the lower ear plate (22) comprises a bottom plate and a vertical plate arranged on the bottom plate, wherein the vertical plate and the bottom plate are intersected with each other; the risers form a hinged plate for hinging the lower pull rod (23) and are hinged with each other through a lower pin shaft (24).
4. A self-replacing arch bridge boom as claimed in claim 2 or 3, wherein: the upper lifting point (10) comprises an upper lug plate (11) directly fixed on the arch rib, the top end of the middle suspender (30) is coaxially provided with a fork lug, and the fork lug and the upper lug plate (11) are inserted into each other and hinged with each other through an upper pin shaft (12).
5. A self-replacing arch bridge boom as recited in claim 1, 2 or 3, wherein: a scale (32) is arranged at the rod body of the middle suspender (30).
6. A self-replacing arch bridge boom as recited in claim 1, 2 or 3, wherein: the cable sensor (52) is a magnetic flux sensor.
7. A cable force control method, the cable force control method applying the self-replacement arch bridge boom according to claim 1, characterized in that: when the maintenance of the intermediate boom (30) is performed, the cable force is adjusted by screwing the fastening nut (51), and the required rotation cycle number of the fastening nut (51) is calculated by the following formula:
wherein:
n is the number of required rotations of the fastening nut (51);
f is a cable force adjustment value, and is obtained by subtracting the reading of the current cable force sensor (52) from the rated cable force value of the middle suspender (30);
l is the available section length of the intermediate boom (30);
p is the thread pitch of the external thread section (31) at the middle suspender (30);
e is the elastic modulus of the intermediate boom (30);
s is the cross-sectional area of the intermediate boom (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310288473.5A CN116446262A (en) | 2023-03-21 | 2023-03-21 | Self-replacement arch bridge suspender and cable force control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310288473.5A CN116446262A (en) | 2023-03-21 | 2023-03-21 | Self-replacement arch bridge suspender and cable force control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117171957A (en) * | 2023-07-31 | 2023-12-05 | 昆明理工大学 | Boom cable force identification method based on dung beetle search algorithm under different boundaries |
| CN117373219A (en) * | 2023-10-11 | 2024-01-09 | 合肥工业大学 | Short boom longitudinal bridge direction deviation early warning device and method |
-
2023
- 2023-03-21 CN CN202310288473.5A patent/CN116446262A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117171957A (en) * | 2023-07-31 | 2023-12-05 | 昆明理工大学 | Boom cable force identification method based on dung beetle search algorithm under different boundaries |
| CN117373219A (en) * | 2023-10-11 | 2024-01-09 | 合肥工业大学 | Short boom longitudinal bridge direction deviation early warning device and method |
| CN117373219B (en) * | 2023-10-11 | 2024-05-17 | 合肥工业大学 | Short boom longitudinal bridge direction deviation early warning device and method |
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