CN117661474A - Cantilever bridge girder erection machine and application method of advancing-anchoring system thereof - Google Patents

Cantilever bridge girder erection machine and application method of advancing-anchoring system thereof Download PDF

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Publication number
CN117661474A
CN117661474A CN202311556001.XA CN202311556001A CN117661474A CN 117661474 A CN117661474 A CN 117661474A CN 202311556001 A CN202311556001 A CN 202311556001A CN 117661474 A CN117661474 A CN 117661474A
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China
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weight
bridge
anchoring
lifting lug
reversing
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CN202311556001.XA
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Chinese (zh)
Inventor
徐声亮
黄袁媛
陈巨峰
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Ningbo Municipal Engineering Construction Group Co Ltd
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Ningbo Municipal Engineering Construction Group Co Ltd
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Priority to CN202311556001.XA priority Critical patent/CN117661474A/en
Publication of CN117661474A publication Critical patent/CN117661474A/en
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Abstract

The invention discloses a cantilever bridge girder erection machine and a use method of an advancing-anchoring system thereof. The cantilever bridge girder erection machine comprises a supporting truss system and an advancing-anchoring system, wherein the advancing-anchoring system comprises a machine body advancing driving device, and the machine body advancing driving device comprises a weight system; the weight system comprises a rear pivot middle chord member, a weight tension hoist and a weight structure; the weight construction comprises a girder transporting trolley, bridge steel structure sections and balancing weights; the weight tensioning hoist comprises two groups, wherein one group of weight tensioning hoist is vertically arranged, and two ends of the weight tensioning hoist are correspondingly connected with the front end of the girder transporting trolley and a hanging point arranged on a middle chord of the supporting truss system respectively; the rest group of weight-bearing tension blocks are arranged along the forward bridge direction, two ends of the rest group of weight-bearing tension blocks are respectively and correspondingly connected with the rear end of the girder transporting trolley and hanging points arranged on chords in rear supporting points of the supporting truss system, and a weight-bearing metering mechanism is arranged on the girder transporting trolley. Therefore, the invention improves the stability and safety of the overhead operation of the cantilever bridge girder erection machine.

Description

Cantilever bridge girder erection machine and application method of advancing-anchoring system thereof
Technical Field
The invention relates to a cantilever bridge girder erection machine and a using method of an advancing-anchoring system thereof, belonging to auxiliary equipment for bridge construction.
Background
Chinese patent CN202211543500.0 discloses a part cantilever assembly aerial work platform for a full welded steel truss bridge and a construction method thereof. The aerial operation platform is bridge construction equipment, realizes a construction operation method of front cantilever and rear feeding beam, and is suitable for truss bridges which can not be arranged for temporary support or auxiliary ship states and span valleys and channels. The method combines a 'hanging basket' for cantilever construction and a 'bridge girder erection machine' system for simple support and continuous construction.
As large-scale bridge construction equipment, the design stage of the equipment needs to pay attention to the safety and the function use efficiency of the equipment, and the convenience of equipment installation and dismantling is considered. The bridge girder erection machine which spans rivers and valleys in China is large in size or components are large in size, and then the bridge girder erection machine is installed by adopting a large-tonnage floating crane or a large-tonnage truck crane or a crawler crane; or the components are miniaturized and are installed by adopting a tower crane or a small-tonnage truck crane.
In view of the fact that the aerial working platform is of a cantilever structure, in the driving process, if no control measures are taken, the aerial working platform is prone to overturning, in order to ensure the driving safety of the aerial working platform and prevent the aerial working platform from overturning, in the above-mentioned publication, a back pressure device is disclosed, and comprises a platform rear cross beam, a reverse tank trolley, a back pressure beam and a back pressure beam support, wherein the platform rear cross beam is installed at the rear end of the bottom layer (namely, two truss lower chords) of the aerial working platform, and meanwhile, the platform rear cross beam is temporarily removed in order to meet the requirement of segment transportation in the using stage of the aerial working platform, and is reinstalled in the travelling segment due to the back pressure requirement. The reverse tank dolly is installed on the platform rear cross beam. The rear end of the back pressure beam is supported on the rear cross beam of the platform through the back tank trolley, and the front end of the back pressure beam is supported on the upper deck system of the main bridge. Through practical use, the anti-overturning effect of the back pressure equipment is not ideal, so that a weight system which can ensure the driving safety of an aerial work platform is necessary to be redeveloped.
Disclosure of Invention
The invention aims to provide a cantilever bridge girder erection machine and a use method of an advancing-anchoring system thereof, so as to improve the stability and safety of the cantilever bridge girder erection machine in aerial operation.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the cantilever bridge girder erection machine comprises a machine body, wherein the machine body comprises a supporting truss system and an advancing-anchoring system, and the advancing-anchoring system comprises a machine body advancing driving device and a machine body anchoring device; the bottom of the anchoring section of the supporting truss system is provided with an organism advancing driving device, the supporting truss system is driven by the power of the organism advancing driving device to drive the supporting truss system to advance to the preset splicing position of the steel bridge section of the bridge deck on the main bridge, and the anchoring section of the supporting truss system is anchored at the preset splicing position of the steel bridge section of the bridge deck on the main bridge through a detachable organism anchoring device; the machine body advancing driving device comprises a front supporting point driving system, a front supporting point track system, a rear supporting point driving system, an anti-reversing system and a weight system, and the machine body anchoring device comprises a front supporting point anchoring system and a rear supporting point anchoring system; the weight system is built based on a girder transporting trolley and comprises a rear pivot middle chord, a weight tension hoist and a weight structure; the weight construction comprises a girder transporting trolley, a bridge steel structure section and a balancing weight, wherein the bridge steel structure section and the balancing weight are loaded on the girder transporting trolley; the weight tensioning hoist comprises two groups, wherein one group of weight tensioning hoist is vertically arranged, and two ends of the weight tensioning hoist are correspondingly connected with the front end of the girder transporting trolley and a hanging point arranged on a middle chord of the supporting truss system respectively; the rest group of weight tension blocks are arranged along the forward bridge direction, and two ends of the rest group of weight tension blocks are respectively correspondingly connected with the rear end of the girder transporting trolley and hanging points arranged on chords in rear supporting points of the supporting truss system;
The girder transporting trolley is provided with a weight metering mechanism which comprises a section weight detection mechanism, a balancing weight metering device and balancing weight lifting equipment, wherein the section weight detection mechanism is arranged on the section lifting equipment and can detect the weight of a lifted bridge steel structure section and feed detected weight information back to the balancing weight metering device; the balancing weight metering device determines the weight of the balancing weight loaded on the beam transporting trolley according to the weight of the received bridge steel structure section, and the balancing weight metering device is hoisted in place by controlling balancing weight hoisting equipment.
Preferably, the weight metering device comprises a weightThe number calculation module can calculate the number N of the balancing weights required to be supplemented on the girder transporting trolley according to the weight of the bridge steel structure section loaded on the girder transporting trolley p And send the instruction of lifting the balancing weight to the balancing weight lifting device to promote the balancing weight lifting device to lift N on the beam transporting trolley p The balancing weight is blocked, so that the body is subjected to weight pressing operation;
in the balancing weight number calculation module, balancing weight supplementing number N is integrated p Is calculated according to the formula:
wherein: ni represents a negative reaction force of any rear pivot point i; k represents an anti-overturning safety coefficient; Representing the weight of the bridge steel structure section m; g c Representing the effective weight of the girder transporting trolley; g 0 Representing the weight of each counterweight.
Preferably, the balancing weight metering device comprises a balancing weight mass calculation module, wherein the balancing weight mass calculation module can calculate the weight G 'of the balancing weight required to be supplemented on the girder transporting trolley according to the weight of the bridge steel structure section loaded on the girder transporting trolley' p And send the instruction of hoist and mount of balancing weight to balancing weight hoist and mount equipment, in order to make balancing weight hoist and mount weight G 'on the fortune roof beam dolly of balancing weight hoist and mount equipment' p The balancing weight of the machine body is arranged, so that the machine body is subjected to weight pressing operation;
in the weight block mass calculation module, the weight G 'of the weight block is integrated' p Is calculated according to the formula:
wherein: ni represents a negative reaction force of any rear pivot point i; k represents an anti-overturning safety coefficient;representing the weight of the bridge steel structure section m; g c Representing the effective weight of the girder transporting trolley; g 0 Representing the weight of each counterweight.
Preferably, the anti-reversing system comprises an anti-reversing hanging lifting lug, an anti-reversing anchoring lifting lug, an anti-reversing chain block and an anti-reversing tension meter;
a plurality of lifting lug hanging points are symmetrically distributed at the bottoms of the lower chords at two sides of the supporting truss system, and each lifting lug hanging point is provided with an anti-reversing hanging lifting lug along the transverse bridge direction of the main bridge; the number n of shackle hanging points disposed at the bottom of each side bottom chord of the lattice system is:
Wherein L1 represents a single forward travel distance of the machine body, and L2 represents an uncontrolled sliding length threshold;
the arrangement sites of the anti-reversing hanging lifting lugs at the bottom of the lower chord member are a lifting lug hanging site A1, a lifting lug hanging site A2 … …, a lifting lug hanging site Aj … … and a lifting lug hanging site An from a front supporting point to a rear supporting point of the supporting truss system in sequence, wherein n is a positive integer;
an anti-reversing anchoring lifting lug is arranged at the position close to the tops of the side webs at the two sides of the bridge deck, and the anchor point center of the anti-reversing anchoring lifting lug is adjacent to the front supporting point of the supporting truss system; the two anti-reversing anchoring lifting lugs are correspondingly first and second anti-reversing anchoring lifting lugs;
one end of the anti-reversing chain block is connected with the anti-reversing anchoring lifting lug on the same side through an anti-reversing tension meter, and the other end of the anti-reversing chain block is connected with the anti-reversing hanging lifting lug at any lifting lug hanging site Aj;
in the advancing process of the supporting truss system, an anti-reversing hanging lifting lug at a lifting lug hanging site A1 is connected with an anti-reversing anchoring lifting lug on the same side through an anti-reversing chain block; as the supporting truss system moves, the anti-reversing chain hoist is pulled, the value F fed back by the anti-reversing tension meter is promoted to change, and when the value F fed back by the anti-reversing tension meter reaches a preset tension threshold value Fm, the front fulcrum traveling crane is stopped or the front fulcrum traveling crane and the rear fulcrum traveling crane are simultaneously stopped, and the anti-reversing chain hoist is manually or automatically detached from the anti-reversing hanging lifting lug at the lifting lug hanging site A1 and then is hung on the anti-reversing hanging lifting lug at the lifting lug hanging site A2; and the machine body is reciprocated in this way until the machine body finishes a single forward distance, and at the moment, the two ends of the anti-reversing hand-pulling block are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the lifting lug hanging site An.
Preferably, when the anti-reverse chain block is automatically detached from the anti-reverse hanging lifting lug at the lifting lug hanging site A1 and then automatically hung on the anti-reverse hanging lifting lug at the lifting lug hanging site A2, the anti-reverse system is provided with an automatic clamping jaw device;
the automatic clamping jaw equipment comprises a servo driving mechanism, a clamping jaw mechanism, a lifting lug hanging site identification tag and a clamping jaw driving control mechanism;
each lifting lug hanging site is stuck with a lifting lug hanging site identification tag; the clamping jaw mechanism is provided with a code scanner, and the code scanner can identify corresponding lifting lug hanging sites by scanning lifting lug hanging site identification tags;
the clamping jaw driving control mechanism plans a corresponding working path according to the position information of each lifting lug hanging position point so as to control the servo driving mechanism to drive the clamping jaw mechanism to move to the corresponding lifting lug hanging position point Aj and match with the lifting lug hanging position point label information obtained by the code scanner on the clamping jaw mechanism, then controls the clamping jaw mechanism to move to the next lifting lug hanging position aj+1 after the anti-reversing chain block at the corresponding lifting lug hanging position point Aj is dissociated and match with the lifting lug hanging position label information obtained by the code scanner on the clamping jaw mechanism, and then connects the anti-reversing chain block to the anti-reversing hanging lifting lug corresponding to the lifting lug hanging position aj+1, and reciprocates in this way until the machine body completes a single advancing distance, and at the moment, the two ends of the anti-reversing chain block are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the lifting lug hanging position An.
Preferably, the front fulcrum traveling crane comprises two front fulcrum traveling cranes which are arranged at the positions of the two front fulcrums arranged at the front end of the supporting truss system in a one-to-one correspondence manner, and each front fulcrum traveling crane adopts a double-wheel electric drive rail traveling crane;
the front fulcrum track system comprises a front fulcrum driving track, a track leveling structure arranged at the bottom of the front fulcrum driving track and front fulcrum driving parking structures arranged at two ends of the front fulcrum driving track; the front supporting point driving tracks are two, and correspond to the first front supporting point driving track and the second front supporting point driving track, wherein: the first front fulcrum driving rail is arranged along the small Gao Chengce bridge direction of the upper bridge deck, and the second front fulcrum driving rail is arranged along the large Gao Chengce bridge direction of the upper bridge deck; the two front fulcrum traveling crane are correspondingly arranged in the two front fulcrum traveling crane rails in a one-to-one correspondence manner, the length of each front fulcrum traveling crane rail can be matched with the single-movement distance of the machine body, and the distance between the two front fulcrum traveling crane rails is matched with the center distance of the main truss of the main bridge and the center distance of the supporting truss;
the track leveling structure is of a first track leveling structure, is constructed by matching with the small elevation side of the bridge deck of the main bridge, and comprises a first front supporting point track support, wherein the first front supporting point track support comprises a bolster and a plurality of first wedge-shaped steel plates uniformly distributed at the bottoms of the bolster and the first front supporting point driving track. The other type is a second track leveling structure which is matched with the large-elevation side of the main bridge deck and comprises a second front supporting point track support, wherein the second front supporting point track support comprises a plurality of second wedge-shaped steel plates uniformly distributed at the bottom of a second front supporting point travelling crane track.
Preferably, the double-wheel electrically-driven track traveling crane comprises two driving wheel sets, a balance beam, a traveling motor system and a traveling brake system; the two driving wheel components are arranged at two ends of the balance beam, and the middle part of the balance beam is arranged on the support truss system through a connecting piece; the power output end of the driving motor system is connected with the driving wheel set in a linkage way, and meanwhile, the front supporting point driving is provided with a driving braking system.
Preferably, the rear supporting point driving system comprises two rear supporting point driving systems which are respectively arranged at two sides of the bottom of the rear end of the supporting truss system, each rear supporting point driving system comprises a fixed connecting column, a pin shaft adjusting section, a tank connecting section and a tank, the upper end of the fixed connecting column is fixedly connected with the bottom of the supporting truss system, the lower end of the fixed connecting column is connected with the pin shaft adjusting section in a positioning manner through a forward bridge, the pin shaft adjusting section is also connected with the upper end of the tank connecting section in a positioning manner through a transverse bridge, and the tank is arranged at the lower end of the tank connecting section.
Preferably, the front pivot anchoring system comprises two types, wherein one type is a first front pivot anchoring structure which is constructed by matching with the small elevation side of the upper bridge deck, and comprises a first front pivot anchoring supporting cushion block and a first front pivot anchoring supporting cushion beam; the other type is a second front supporting point anchoring structure which is constructed by matching with the large elevation side of the upper bridge deck, and comprises a second front supporting point anchoring supporting cushion block and a second front supporting point anchoring supporting cushion beam; one of the two front fulcrum traveling vehicles sequentially passes through a first front fulcrum anchoring supporting cushion block and a first front fulcrum anchoring supporting cushion beam to be arranged above a small Gao Chengce of the upper bridge deck, and the other front fulcrum traveling vehicle sequentially passes through a second front fulcrum anchoring supporting cushion block and a second front fulcrum anchoring supporting cushion beam to be arranged above a large Gao Chengce of the upper bridge deck;
The rear pivot anchoring system adopts a two-force rod system and comprises a rear anchor upper rod and a rear anchor lower rod, wherein the upper end of the rear anchor lower rod is connected with the lower end of the rear anchor upper rod in a positioning way through an anchoring pin shaft arranged along the transverse bridge direction, the lower end of the rear anchor lower rod is anchored by a transverse bridge preset on a main girder upper chord top plate of a main bridge to a temporary anchoring stiffening rib, and the upper end of the rear anchor upper rod is fixedly arranged at the bottom of a lower chord of the supporting truss system.
Another technical object of the present invention is to provide a method for using the advancing-anchoring system in the cantilever bridge girder erection machine, wherein the machine body has two working modes under the action of the advancing-anchoring system, one is a machine body advancing mode realized based on the machine body advancing driving device, and the other is a machine body anchoring mode realized based on the machine body anchoring device;
the body advancing mode specifically includes the following steps:
step one, assembling a weight system and an anti-reversing system on an anchoring section of a support truss system;
step two, starting a front supporting point travelling crane to drive a machine body to advance towards a preset splicing position of a steel bridge section of the bridge deck on the main bridge;
step three, when the numerical value F fed back by the anti-reversing tension meter reaches a preset tension threshold value Fm in the advancing process of the machine body, stopping the front supporting point travelling crane and starting the automatic clamping jaw equipment;
Step four, a clamping jaw driving control mechanism of automatic clamping jaw equipment controls a servo driving mechanism to drive a clamping jaw mechanism to move according to a planned working path until a lifting lug hangs a site A2; at the moment, the code scanner on the clamping jaw mechanism scans the lifting lug hanging point identification tag in the working range, the obtained tag information is the lifting lug hanging point A2, the servo driving mechanism is indicated to move according to a preset working path, and then the next step is carried out; otherwise, updating the working path of the servo driving mechanism by taking the lifting lug hanging site information indicated by the current tag information as a reference, and then controlling the servo driving mechanism to move according to the updated working path of the servo driving mechanism until reaching a lifting lug hanging site A2;
step five, repeating the step three and the step four until the machine body is advanced to a preset splicing position of the steel bridge section of the bridge deck on the main bridge, wherein at the moment, two ends of the anti-reversing hand hoist are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the hanging site An of the lifting lug;
the body anchoring mode specifically comprises the following steps:
and a detachable machine body anchoring device is arranged between the anchoring section of the supporting truss system and the splicing preset position of the steel bridge section of the bridge deck on the main bridge, so that the machine body is anchored on the bridge deck on the main bridge, and preparation is made for conveying and splicing the subsequent steel structure section of the main bridge.
Based on the technical objects, compared with the prior art, the invention has the following advantages:
1. the weight system is assembled on the anchoring section of the truss support system, and the anchoring section is respectively connected with the truss support system along the bridge direction and the vertical direction, so that the weight system can be ensured to effectively prevent the cantilever bridge girder erection machine from overturning. And through effective weight verification of the weight system, the anti-overturning function of the weight system is realized, and the stability and safety of the overhead operation of the cantilever bridge girder erection machine are consolidated.
2. The anti-reversing system can effectively prevent the organism from reversing.
Drawings
FIG. 1 is a schematic perspective view of a cantilever bridge girder erection machine according to the present invention;
FIG. 2 is a transverse bridging layout of a front anchor system (advanced stage);
FIG. 3 is a transverse bridging layout of a front fulcrum anchor system (anchoring stage);
FIG. 4 is a schematic view of the structure of the rear pivot forward direction of the vehicle;
FIG. 5 is a diagram of a bearing truss bottom chord anti-backup shackle arrangement;
FIG. 6 is a cross-sectional view of an anti-backup device;
FIG. 7 is a transverse cross-bridge construction view of a rear pivot anchor;
FIG. 8 is a forward-axle layout of a girder transporting trolley as a ballast;
fig. 9 is a cross-bridge layout of a beam-carrying trolley as a ballast.
In the figure: 1. a lattice system; 2. a multi-directional transport system; 3. an advancement-anchoring system; 4. an operating platform system; 5. a main bridge steel structure;
111. a first front pivot lower vertical rod; 112. a second front pivot lower vertical rod; 121. a first front pivot lower chord; 122. a second front pivot lower chord; 13. a front pivot cross beam; 14. a rear anchor point lower chord; 15. the lower part is connected with a chord; 161. a first rear anchor lower chord; 162. a second rear anchor lower chord; 171. a rear anchor beam; 172. a vertical rod in the rear anchor point; 173. the middle connecting chord; 174. a rear pivot middle chord beam;
311. a first front pivot point travelling crane; 312. a second front pivot point travelling crane; 321. the first front supporting point anchors the supporting cushion block; 322. the second front supporting point anchors the supporting cushion block; 331. a first front pivot anchor supporting the bolster; 332. a second front pivot anchor supporting the bolster; 361. a first front pivot travel rail; 362. a first front fulcrum rail support; 363. a second front fulcrum rail support;
511. a first cantilever arm; 512. a second cantilever arm; 521. a first upper chord; 522. a second upper chord; 531. a first chord centerline; 532. a second chord centerline; 54. a main bridge deck; 55. a web member;
341. A fixed connecting column; 342. the pin shaft adjusts the segment; 343. a pin shaft along the bridge direction; 344. the transverse bridge is connected with the pin shaft; 345. tank connection sections; 346. a tank;
351. a first anti-backup hanger; 351-1, a first anti-backup suspension shackle at the bottom of the left side lower chord; 351-2, a first anti-backup hanger at the bottom of the right lower chord; 352. a second anti-backup suspension shackle; 353. a third anti-backup suspension shackle; 354. a fourth anti-backup suspension shackle; 355. a first anti-reversing chain block; 356. a second anti-reversing chain block; 357. a first anti-backup anchor shackle; 358. a second anti-backup anchor tab;
371. the rear anchor is arranged on the rod; 372. a rear anchor pin shaft; 373. a rear anchor lower rod; 374. a roof stiffener; 375. transverse bridge direction temporary stiffening ribs;
381. a weight-bearing tension block; 382. a lower chord of the main bridge steel structural section; 383. and (5) transporting the girder trolley.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The relative arrangement, expressions and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations).
As shown in fig. 1, the cantilever bridge girder erection machine according to the present invention includes: a support truss system 1, an advancing-anchoring system 3, a multi-directional transportation system 2, an operation platform system 4 and a girder transporting system, wherein:
the support truss system 1 is a core stress structure system and is an overall cantilever support structure, and comprises a main support system and a lateral support system, wherein the main support system comprises two support trusses which are parallel to each other and are arranged along the bridge direction, and the two support trusses are connected through the lateral support system. The chord members and the straight web members of each supporting truss are all provided with rigid nodes, and the rigid nodes are realized by aligning flanges of the H-shaped steel with equal width and web stiffening ribs, so that the traditional truss system is converted into a frame system, and the overall stability is greatly improved. In addition, each supporting truss adopts a three-section structure, so that the inclination angle of the inclined web member is controlled to be between 45 degrees+/-10 degrees, meanwhile, the inclined web member is designed according to a pull rod, two ends of the inclined web member are designed according to a hinged structure, namely, the inclined web member adopts a double-spliced channel steel structure, and the two ends of the inclined web member are connected with truss nodes through connecting steel plates. The truss nodes are of two types, wherein one type is a truss welding node, and a three-side surrounding fillet weld structure is adopted and is used for being connected with the diagonal web member in a welding mode and only used for completing connection manufacturing in a factory; the other type is truss splicing nodes, and a high-strength bolt connection structure is adopted for splicing with the diagonal web members on site.
An advancing-anchoring system 3 providing the functions of "supporting (anchoring)" and "advancing" of the lattice system 1, including a machine body advancing driving device and a machine body anchoring device; the bottom of the anchoring section of the supporting truss system 1 is provided with an organism advancing driving device, the supporting truss system 1 is driven by the power of the organism advancing driving device to drive the supporting truss system 1 to advance to the preset splicing position of the steel bridge section of the bridge deck on the main bridge, and the anchoring section of the supporting truss system 1 is anchored by a detachable organism anchoring device at the preset splicing position of the steel bridge section of the bridge deck on the main bridge.
The multidirectional transportation system 2 mainly bears hoisting operation of components and comprises hoisting equipment, a forward-bridge-to-track system and traveling equipment, and a transverse-bridge-to-track system and traveling equipment. The multidirectional transportation system 2 is arranged on the support truss system 1;
an operation platform system 4 mainly bears and supports the main bridge section and provides an operation space for construction machinery and operators;
and the girder transporting system bears the transportation function of the main bridge sections and comprises girder transporting trolleys, girder transporting tracks and the like.
The specific construction of the advancement-anchoring system 3 according to the invention will be described in detail below with reference to fig. 2-9.
The advancement-anchoring system 3 design:
The advancing-anchoring system 3 of the cantilever bridge girder erection machine needs to satisfy the following 6-point functions:
1) The automatic walking function is required, the automatic walking device is suitable for bridge deck longitudinal slopes and transverse slopes, and the front and rear 4 fulcrums are ensured to bear load simultaneously;
2) The vehicle has the functions of conventional parking and emergency parking, and the forward system is prevented from sliding backwards due to unexpected faults;
3) The rear pivot point is required to be provided with an anchoring or pressing structure so as to resist the overturning bending moment generated by the bearing of the cantilever section;
4) The transverse bridge direction of the cantilever bridge girder erection machine is required to be kept basically horizontal in the walking stage, and is kept absolute horizontal in the working state, so that the walking gradient of the electric hoist for hoisting is reduced;
5) In the anchoring state, the front and rear fulcrums should have enough reliability;
6) The switching between the traveling state and the anchoring state of the cantilever bridge girder erection machine should have sufficient reliability.
Concept design
Some all-steel structure bridges with limited bridge deck working space cannot adopt a 'pushing advancing' mode of a conventional hanging basket. The reason is that: on one hand, the track beam is connected with the main truss top plate by adopting a through long welding seam, the welding seam is required to be removed synchronously after the connection is completed, the field workload is large, and the influence on the main bridge steel structure 5 is large; on the other hand, the outer space of the cantilever bridge girder erection machine is only used for the passage of operators, and cannot accommodate equipment required by pushing forward (the inner side is required to be used as an access passage of a girder transporting rail car).
Therefore, the cantilever bridge girder erection machine adopts a wheel track advancing mode, and the following 8-point measures are adopted to meet the functional requirements:
1) Considering that the counter force of the front pivot of the cantilever bridge girder erection machine is far greater than that of the rear pivot, the front pivot is provided with driving advancing equipment, and the rear pivot is matched with driven advancing equipment;
2) The driving advancing equipment adopts a double-wheel electric drive rail crane, the rated bearing capacity of a wheel rail of a single equipment meets the peak reaction force requirement in the operation stage, the balanced Liang Eding bearing capacity meets the peak reaction force requirement in the anchoring stage, the power system meets the maximum longitudinal slope requirement of the bridge deck, and meanwhile, the driving system also has a braking and parking function;
3) The electrically driven track crane is supported on a QU120 type track. The top surfaces of the rails are kept horizontal through wedge-shaped steel plates and cushion beams, and the top surfaces of 2 rails are positioned at the same elevation;
4) The driven advancing equipment adopts a tank and is directly supported on the top surface of the main bridge. At the position of a single fulcrum, a connecting piece with a parallel bridge direction pin shaft 343 and a transverse bridge direction pin shaft 344 is required to be simultaneously arranged between the tank and the supporting truss so as to adapt to the change of a bridge deck longitudinal slope and a transverse slope and ensure that the supporting truss is in a 4-fulcrum bearing state;
5) 2 groups of 4 chain blocks with the total length not exceeding 3.0m are arranged between the lower chord member of the cantilever bridge girder erection machine and the upper chord member of the main girder of the main bridge, and the chain blocks are alternately replaced in the advancing process of the cantilever bridge girder erection machine, wherein the fault-tolerant length of each section is not more than 1.5m;
6) The weight of the cantilever bridge girder erection machine in the advancing stage takes the transportation trolley as a main body, the lower chord member and other weight members of the next section are loaded, and the transportation trolley is hoisted in the node area of the middle chord member by 4 chain blocks.
7) In order to ensure smooth switching between the anchoring state and the advancing state of the cantilever bridge girder erection machine, a pin shaft system is required to be arranged at the front pivot and the rear pivot so as to adapt to small-amplitude vertical displacement of a single pivot. Otherwise, the reliability of the system is affected by structural deformation adjustment.
8) In an anchoring state, the front supporting point is leveled through a wedge-shaped cushion block and a cushion beam, and the rear supporting point is leveled through a customized connecting rod.
In summary, the advancing-anchoring system 3 of the cantilever bridge girder erection machine comprises two parts, which are divided into a machine body advancing driving device and a machine body anchoring device, wherein: the machine body advancing driving device comprises a front supporting point driving system, a front supporting point track system, a rear supporting point driving system, an anti-reversing system and a weight system, and the machine body anchoring device comprises a front supporting point anchoring system and a rear supporting point anchoring system.
Front fulcrum driving:
the front fulcrum traveling crane is arranged at the position of the front fulcrum of the supporting truss system 1, and in the invention, the number of the front fulcrum traveling crane is two in the supporting truss system 1, so that the number of the front fulcrum traveling crane is two, and the front fulcrum traveling crane is correspondingly a first front fulcrum traveling crane 311 and a second front fulcrum traveling crane 312.
The front fulcrum traveling crane adopts a double-wheel electric drive rail traveling crane, products are customized for factories, and key parameters are as follows:
1) The front fulcrum traveling crane comprises 2 wheel shafts, 1 balance beam, 1 connecting piece, a motor system and a braking system. The rail crane is connected with the supporting truss through bolts, and the connecting piece is connected with the balance beam through a pin shaft;
2) The rated bearing capacity of the single front fulcrum traveling crane based on the wheel axle is not lower than 800kN (obtained by calculation according to the peak counter force of the front fulcrum in the traveling stage);
3) The rated bearing capacity of the single front fulcrum traveling crane based on the balance beam and the connecting piece is not lower than 1600kN (obtained according to the peak counter force of the front fulcrum in the anchoring stage);
4) The maximum climbing capacity of the single front fulcrum driving is not less than 2.5%.
Front fulcrum rail system:
because the front fulcrum traveling crane adopts the double-wheel electric drive track traveling crane, a matched front fulcrum track system is required to be arranged at the corresponding position of the main bridge deck of the main bridge steel structure, so that the front fulcrum traveling crane can walk on the main bridge deck. The front fulcrum track system comprises a front fulcrum running track, a track leveling structure arranged at the bottom of the front fulcrum running track and front fulcrum running parking structures arranged at two ends of the front fulcrum running track; the front supporting point driving tracks are two, and correspond to the first front supporting point driving track and the second front supporting point driving track, wherein: the first front supporting point driving track 361 is arranged along the small Gao Chengce of the upper bridge deck along the bridge direction, and the second front supporting point driving track is arranged along the large Gao Chengce of the upper bridge deck along the bridge direction; the two front fulcrum traveling crane are correspondingly arranged in the two front fulcrum traveling crane rails in a one-to-one correspondence manner, the length of each front fulcrum traveling crane rail can be matched with the single-movement distance of the machine body, and the distance between the two front fulcrum traveling crane rails is matched with the center distance of the main truss of the main bridge and the center distance of the supporting truss. The track leveling structure is of two types, one of the two types is a first track leveling structure which is constructed by matching with the small-elevation side of the bridge deck of the main bridge, and comprises a first front supporting point track support 362, wherein the first front supporting point track support 362 comprises a bolster and a plurality of first wedge-shaped steel plates uniformly distributed at the bottoms of the bolster and the first front supporting point running track 361. The other type is a second track leveling structure which is matched with the large-elevation side of the main bridge deck and comprises a second front pivot track support 363, wherein the second front pivot track support 363 comprises a plurality of second wedge-shaped steel plates uniformly distributed at the bottom of a second front pivot running track.
Specifically, as shown in fig. 1 and 2, the front fulcrum driving track adopts a QU120 type with the height of 170mm and the single track length of 12m so as to adapt to the single-movement distance of an aerial work platform; the track spacing is 7.2m, and is matched with the center distance of the main truss of the main bridge and the center distance of the supporting truss. In order to ensure the level of the top surface of the track and overcome the permanent cross slope influence of 2% bridge deck, the front fulcrum track system adopts the following measures:
1) And 1 wedge-shaped steel plate is arranged at the bottom of the track at intervals of 300mm (clear distance), and the platform track beam is leveled. A small Gao Chengce, a single steel plate with a length of 400mm (transverse bridge arrangement), a width of 150mm, a maximum thickness of 30mm, a minimum thickness of 22m and a long side gradient of 2%; gao Chengce, the length of a single steel plate is 300mm, the width is 150mm, the maximum thickness is 25mm, the minimum thickness is 19mm, and the long side gradient is 2%;
2) The large Gao Chengce is only provided with a wedge-shaped steel plate, the small Gao Chengce and the large Gao Chengce have 144mm height difference (center distance 7.2m and 2% transverse slope), 3-piece I14a I-steel is adopted as a bolster, and the 4mm height difference is eliminated by the center thickness of the wedge-shaped steel plate;
3) The large Gao Chengce, the wedge-shaped steel plate and the top surface of the upper chord of the main bridge are connected by spot welding, and the QU120 track and the wedge-shaped steel plate are fixed by a pressing plate (the pressing plate is welded on the top surface of the wedge-shaped steel plate); the single-channel bolster is 6m long, the bolster is connected with the wedge-shaped steel plate by adopting a fillet weld, the bolster is connected with the upper chord top surface of the main truss by adopting spot welding, the wedge-shaped steel plate and the track are constructed as the same as the large Gao Chengce-front fulcrum track system is an integral body, and the wedge-shaped steel plate and the track are fixed with the upper chord top surface of the main bridge by the spot welding and do not bear the action of horizontal load in theory;
4) The two ends of the QU120 track are provided with parking structures.
5) During the hoisting operation of each segment, the length of the front supporting point supporting rail from the winding port of the main bridge is carried out according to a preset value, so that each segment can be precisely hoisted in place along the bridge.
Front pivot anchoring system
The front pivot anchoring system (front pivot anchoring system) is positioned at the bottom of a balance beam of the front pivot traveling crane to the top of a main bridge deck of the existing steel bridge, and comprises two types, wherein one type is a first front pivot anchoring structure which is constructed by matching with the small elevation side of an upper bridge deck (main bridge deck), and comprises a first front pivot anchoring supporting cushion block 321 and a first front pivot anchoring supporting cushion beam 331; the other type is a second front supporting point anchoring structure which is constructed by matching with the high elevation side of the upper bridge deck (main bridge deck), and comprises a second front supporting point anchoring supporting cushion block 322 and a second front supporting point anchoring supporting cushion beam 332; the first front supporting point traveling crane sequentially passes through the first front supporting point anchoring supporting cushion block 321 and the first front supporting point anchoring supporting cushion beam 331 to be arranged above the small Gao Chengce of the upper bridge deck, and the second front supporting point traveling crane sequentially passes through the second front supporting point anchoring supporting cushion block 322 and the second front supporting point anchoring supporting cushion beam 332 to be arranged above the large Gao Chengce of the upper bridge deck.
In the front fulcrum anchoring system, the following 3 points are mainly considered for the anchoring supporting cushion beam:
1) I-steel is preferably selected for rolling so as to avoid the problem of local stability of flanges or webs;
2) The height difference of the front supporting point is 144mm because of the influence of the 2% transverse slope of the bridge deck, so that the height difference of the anchoring and supporting cushion beam is 14cm (the rest 4mm is adjusted by a wedge-shaped steel plate);
3) The QU120 type track is 170mm in height, the distance from the bottom of the balance beam to the top of the track is 100mm, namely, the basic distance from the bottom of the balance beam to the steel bridge deck in the advancing stage is 270mm (without the thickness of a wedge-shaped steel plate), and in order to ensure that the conversion of the advancing-anchoring system 3 can be completed within 50% of the working stroke (10 cm) of a mechanical jack, the large Gao Chengce anchor pad beam is preferably I20-I36.
Therefore, the large Gao Chengce is I22a, the small Gao Chengce is I36a, the length of a single backing beam is 800mm, and 4 anchor points are arranged; the single-channel anchor beam is provided with vertical stiffening ribs with the thickness of 12mm and the spacing of 100mm.
Wedge-shaped steel plates are arranged at the tops of the anchoring beams, the width of the large Gao Chengce steel plates is 250mm, the length of the large Gao Chengce steel plates is 400mm, the maximum plate thickness is 25mm, the long sides are provided with 2% slopes, and the minimum plate thickness is 17mm; the small Gao Chengce steel plate has the width of 300mm, the length of 500mm, the maximum plate thickness of 30mm and the minimum plate thickness of 20mm. The center height difference of the wedge-shaped steel plates with large and small elevations is 4mm.
Fillet welds are required to be arranged between the wedge-shaped steel plate and the anchoring pad beam, between the wedge-shaped steel plate and the balance beam of the front fulcrum crane, and between the anchoring pad beam and the main bridge steel deck. Wherein, in order to avoid the upper and lower layer weld joints of the wedge-shaped steel plate to be positioned at the same position, the forward-bridge-direction weld joint is connected with the anchoring pad beam, and the transverse-bridge-direction weld joint is connected with the balance beam of the front fulcrum travelling crane; to ensure the effectiveness of the connection of the anchor beam and the steel bridge deck, only transverse bridge welds are provided therebetween. The leg size of the single pass fillet weld is 10mm, and the length of each layer of accumulated weld is not less than 200mm, so as to ensure the horizontal bearing capacity requirement (transverse bridge direction and forward bridge direction) of the single front supporting point anchoring point.
Rear pivot driving system
As shown in fig. 1, the rear pivot driving system comprises two rear pivot driving systems which are respectively arranged at two sides of the bottom of the rear end of the support truss system. As shown in fig. 4, the single rear pivot traveling crane is formed by splicing 4 parts of a fixed connecting column 341, a pin shaft adjusting section 342, a tank connecting section 345, a tank 346 and the like. Except that the tank 346 is connected with the tank connecting section 345 by bolts, other components are connected by phi 70 pin shafts.
The design key points of the rear pivot driving system comprise the following 6 points:
1) And the peak reaction force of the fulcrum after the driving state is 120kN. The factory has CRM30 type tanks 346, the bearing capacity of a single tank 346 is 30 tons, and the single tank 346 meets the requirement of single-pivot counter force.
2) Whether the pin shaft center of the pin shaft is not larger than the total length of the supporting surface of the tank 346 to the bridge deck, the failure of a two-force rod system is avoided, 1 tank 346 is arranged along the bridge direction, the pin shaft 343 is arranged under the bridge direction, and the center distance of the pin shaft is not larger than 300mm from the bridge deck; the 2 tanks 346 are arranged in the transverse bridge direction, the net spacing of the tanks 346 is calculated according to 60mm (according to the principle that the center spacing of stiffening ribs supported by the tanks 346 is equal), so that the transverse bridge direction pin roll 344 is allowed to be arranged upwards, and the center distance of the transverse bridge direction pin roll is not more than 560mm from the bridge deck.
3) The fixed connecting column 341 adopts a box-type structure, the thickness of the plate is 20mm, and the position of the plate is aligned with the vertical stiffening rib and the longitudinal additional stiffening rib of the lower chord of the supporting truss; the pin shaft connecting end is matched with the rotation requirement of not less than 10 degrees, adopts a fan-shaped structure, and simultaneously considers the problem of local stability of the ear plate, and 2 vertical stiffening ribs and 1 local stiffening rib are arranged out of the plane; in addition, to increase the overall torsional stiffness of the connecting post, 1 12mm diaphragm is positioned adjacent the pin in the box configuration.
4) The tank connecting section 345 needs to be provided with 4 main stiffening ribs corresponding to the supporting beams of the tank 346, the stiffening ribs are provided with phi 70 pin holes, the length of the main stiffening ribs is at least smaller than 70mm of the clearance distance between the forward bridge and the inner edge of the fixed connecting column 341 so as to ensure that the pin shaft adjusting section 342 is accommodated, and the height is not smaller than Yu Shunqiao and the width range of the steel plate is reinforced to the pin shaft 343; the transverse bridge direction stiffening ribs are arranged between the main stiffening ribs, a sealing plate is arranged at the top of a grid bin corresponding to the tank 346, the grid bin corresponding to the tank 346 splice is not arranged, and the splicing operation space of connecting bolts (each tank 3466, the longitudinal bridge direction spacing is 150mm and the transverse bridge direction spacing is 260 mm) between the segments and the tank 346 is ensured.
5) The pin shaft adjusting section 342 is also of a box-shaped structure, and 2 transverse partition plates are arranged along the height direction for considering the overall stability, and the thickness of the plate is 20mm. The transverse bridge direction total width of the pin shaft adjusting section 342 is not smaller than the range total width of the main stiffening rib of the tank connecting section 345, the forward bridge direction total width of the pin shaft adjusting section 342 is not larger than the forward bridge direction clear width of the fixed connecting column 341, the forward bridge direction clear width of the pin shaft adjusting section 342 is not smaller than the forward bridge direction clear width of the pin shaft adjusting section 342, the distance between the lower transverse partition plate and the tank connecting section 345 is not smaller than 20mm, and the distance between the upper transverse partition plate and the transverse bridge direction pin shaft 344 reinforced steel plate is not smaller than 20mm. Therefore, the lower edge of the segment is defined by the width range of the steel plate reinforced by the pin shaft 343 with the height not smaller than Yu Shunqiao, and the upper edge of the segment is defined by the top surface of the upper transverse clapboard plus 20mm.
Anti-backup system:
the total requirements of the anti-reversing system for arranging the cantilever bridge girder erection machine are as follows:
1) The anti-reversing system should bear the reverse sliding of the platform caused by accidents, according to the steel structural design standard (GB 50017-2017), the horizontal counter force of the heavy crane is 10 percent of the total weight, and the anti-reversing effect of the cantilever bridge girder erection machine is jointly borne by 4 fulcrums (two front fulcrums and two rear fulcrums) which are 15 percent of the total weight in consideration of the possible sliding distance during the reverse sliding;
2) The bottom of the lower chord of the supporting truss is provided with anti-reversing hanging lifting lugs, the specific structure is shown in fig. 5, and the single lifting lugs are arranged along the transverse bridge direction and aligned with the vertical stiffening ribs of the lower chord; and n lanes are arranged along the bottom chords of the lattice girders. The number n of anti-backup suspension lugs arranged at the bottom of each side bottom chord of the lattice system 1 is such that:
where L1 represents the single forward travel distance of the body and L2 represents the runaway glide length threshold. In the present invention, l1=4 meters and l2=1 meter. Thus, n=4, i.e., the anti-backup suspension lugs are arranged 4 times in total, corresponding to the first anti-backup suspension lug 351, the second anti-backup suspension lug 352, the third anti-backup suspension lug 353, and the fourth anti-backup suspension lug 354. Typically, the body single advance distance L1 is an integer multiple of the runaway glide length threshold L2.
The thickness of a single anti-reversing hanging lifting lug is 20mm, the aperture is 50mm, 1 reinforcing steel plate with the thickness of 10mm and the outer diameter of 140mm is respectively welded on two sides, the lifting lug is 180mm wide, and short stiffening ribs (-100 mm multiplied by 16 mm) are arranged at two ends of the lifting lug so as to meet the requirement of single-point 5T braking force.
A label is adhered to each lifting lug hanging point, the label information sequentially comprises a lifting lug hanging point A1, a lifting lug hanging point A2 and a lifting lug hanging point A3 … … along the opposite direction (from a front fulcrum to a rear fulcrum) of the movement of the machine body, and n is a positive integer; and acquiring label information corresponding to the hanging positions of the corresponding lifting lugs through code scanning identification.
3) The bridge deck of the main bridge is provided with an anti-reversing anchoring lifting lug, the structure of the single anti-reversing anchoring lifting lug is the same as that of the anti-reversing hanging lifting lug, 1 track is arranged on each main bridge in the direction of the bridge, the center of the anchor point of the lifting lug is 500mm away from the cantilever port, 2 tracks are arranged on the transverse bridge in the direction of the bridge, and the transverse bridge is positioned near the top of the side web plate of the bridge deck. The 2 anti-reversing anchoring lifting lugs arranged in the transverse bridge direction are respectively a first anti-reversing anchoring lifting lug 357 and a second anti-reversing anchoring lifting lug 358. The first anti-reverse anchoring lug 357 is fastened with the first anti-reverse hanging lug 351-1 at the bottom of the left lower chord through the first anti-reverse chain block 355, and the second anti-reverse anchoring lug 358 is fastened with the first anti-reverse hanging lug 351-2 at the bottom of the right lower chord through the first anti-reverse chain block 356, so as to prevent the cantilever bridge girder erection machine from reversing.
Initially, as shown in fig. 6, the anti-backup suspension shackle at shackle suspension point A1 is connected to the ipsilateral anti-backup anchor shackle by an anti-backup chain block. As the machine body moves, the anti-reversing chain block is pulled to promote the change of the value F fed back by the tension meter arranged between the anti-reversing chain block and the anti-reversing anchoring lifting lug, the machine body is stopped until the value F fed back by the tension meter reaches a preset tension threshold value Fm, and the anti-reversing chain block is manually detached from the anti-reversing hanging lifting lug at a lifting lug hanging position A1 and then is hung on the anti-reversing hanging lifting lug at a lifting lug hanging position A2. Or an automated clamping jaw device (such as a manipulator arranged outside the same side lower chord) is started to detach the anti-reversing chain block from the anti-reversing hanging lifting lug at the lifting lug hanging position A1, and then the anti-reversing chain block is hung on the anti-reversing hanging lifting lug at the lifting lug hanging position A2. Specifically, the automatic clamping jaw device comprises a servo driving mechanism, a clamping jaw mechanism and a clamping jaw driving control mechanism, wherein the clamping jaw driving control mechanism plans a corresponding working path according to the position information of each lifting lug hanging position, so as to control the servo driving mechanism to drive the clamping jaw mechanism to move to the corresponding lifting lug hanging position Aj and match with the lifting lug hanging position label information obtained by a code scanner on the clamping jaw mechanism, then control the clamping jaw mechanism to move to the next lifting lug hanging position aj+1 after the anti-reversing hand hoist at the corresponding lifting lug hanging position Aj is dissociated, match with the lifting lug hanging position label information obtained by a code scanner on the clamping jaw mechanism, further connect the anti-reversing hand hoist to An anti-reversing hanging lifting lug corresponding to the lifting lug hanging position aj+1, and reciprocate so until the machine body completes a single advancing distance, and at the moment, the two ends of the anti-reversing hand hoist are respectively connected with An anti-reversing anchoring lifting lug and a lifting lug hanging position An (n=4 in the drawing).
As shown in fig. 6, a 10T-class anti-reverse tension hoist is arranged between the anti-reverse anchoring lifting lug and the anti-reverse hanging lifting lug, and the maximum working length is not less than 9.0m. The accumulated advancing distance of a single stage of the aerial working platform is not more than 10m, and the anti-falling system comprises 3 stages.
5) Although the advancing distance of each stage of the cantilever bridge girder erection machine is 3-4 m, the state of a tension hoist must be adjusted to be in a tight state (4 fulcrums are ensured to be stressed simultaneously) when the cantilever bridge girder erection machine advances for 1m, and the uncontrolled sliding length of a platform is ensured not to exceed 1.0m.
Rear pivot anchor system:
as shown in fig. 1 and 7, the rear pivot anchoring system of the present invention adopts a "two-force rod" system, that is, is divided into two parts of a fixed length "rear anchor upper rod 371" and a variable length "rear anchor lower rod 373", and is connected by a rear anchor pin shaft 372 of Φ100 during this period, the rear anchor pin shaft 372 substantially equally divides the rear anchor upper and lower rods. For field operation, the diameter of the rear anchor pin 372 is 650mm from the bottom flange of the bottom chord of the lattice girder.
The rear anchor upper rod 371 and the rear anchor lower rod 373 each have a box-shaped cross section. The lifting lug of the rear anchor upper rod 371 is aligned with an additional longitudinal supporting stiffening rib of the lower chord of the supporting truss, and the lifting lug stiffening is aligned with a stiffening rib corresponding to the flange of the rear fulcrum vertical rod; the lifting lug of the rear anchor lower rod 373 is required to be aligned with the stiffening rib of the upper chord top plate of the main girder of the main bridge, and a transverse stiffening rib corresponding to the lifting lug stiffening rib of the rear anchor lower rod 373 is additionally arranged at the upper chord top plate of the main girder of the main bridge. The width of the supplementary stiffening rib is 500mm, the thickness of the supplementary stiffening rib is 16mm, and the supplementary stiffening rib is positioned between the longitudinal stiffening ribs of the upper chord top plate of the main truss, can be manufactured in advance in a factory, and can also be welded on site.
In addition, to ensure torsional rigidity of the upper and lower rear anchor rods, 1 seal plate 16mm thick is provided on each of the upper and lower rear anchor rods at a distance of 270mm from the center of the rear anchor pin shaft 372.
The total height of the rear anchor point is composed of the following 3 parts:
1) The front supporting point supporting height comprises a rail driving balance Liang Zonggao, an anchoring pad beam height and a wedge-shaped steel plate center height, and is a positive value;
2) The design elevation difference of the bridge deck at the front and rear fulcrums comprises a longitudinal slope effect and a construction pre-camber effect 2 part which are positive values;
3) The cantilever section deformation caused by the dead weight of the aerial working platform is negative.
And (3) a weight system:
as shown in fig. 8-9, the girder transporting trolley is used as a weight construction, and 4 weight tension blocks 381 are used for fixing the girder transporting trolley on the supporting truss system 1, and the distance between the lifting points along the bridge is 10m (which is matched with the total length of the girder transporting trolley 383). Wherein the last 2 suspension points are positioned on the middle chord of the rear fulcrum, and the first 2 suspension points are positioned at the non-node of the middle chord.
The beam carriage 383 is disadvantageously only 50% by weight of the effective weight, so the total weight of the carriage must not be less than 40 tons.
The weight of the beam carriage 383 includes the following 3 parts:
1) The self weight of the single girder transporting trolley 383 is 10 tons;
2) The girder carrier 383 is loaded with a lower chord segment 382 of the main bridge steel structural segment hoisted in the next stage, and the weight is 4.92 tons to 22.8 tons.
3) The beam carriage 383 is loaded with additional concrete weights, the individual weights are 0.5x0.5x6m, and the weight of the individual weights is 3.6 tons.
One group of weight tension hoist 381 is vertically arranged, and two ends of the two groups of weight tension hoist 381 are correspondingly connected with the upper end of the weight structure and the hanging points arranged on the middle chord of the supporting truss system 1 respectively; the rest group of weight tension blocks 381 are arranged along the forward bridge direction, and two ends of the rest group of weight tension blocks are respectively correspondingly connected with the rear end of the weight structure and hanging points arranged on chords in rear supporting points of the supporting truss system 1; the effective weight of the weight construction satisfies:
G≥K∑N i
N i -negative reaction of any one of the rear fulcra i;
k-anti-capsizing safety factor.
The effective weight G of the weight construction is calculated by:
G＝G c +G s +G p
wherein: g c Representing the effective weight of the beam carriage 383; g s Representing the weight of the bridge steel structure segments loaded on the girder transporting trolley 383; g p Representing the weight of the counterweight loaded on the beam carriage 383.
When any bridge steel structure section is transported, the weight of the balancing weight which needs to be supplemented on the girder transporting trolley 383 is as follows:
G p ≥K·∑N i -G c -G s
in actual engineering, in order to avoid the trouble of adding the balancing weight, under the condition of not pursuing transportation efficiency, when the bridge steel structure section weight is lightest, the quality of the balancing weight which needs to be supplemented is taken as the quality of the balancing weight which needs to be supplemented for transporting all bridge steel structure sections. However, in view of the large differences in weight of the individual bridge steel structure sections, the weight of the heaviest bridge steel structure section is approximately 4 times the weight of the lightest bridge steel structure section (weight of the heaviest bridge steel structure section: 22.72 tons; weight of the lightest bridge steel structure section: 4.92 tons). Therefore, the invention is provided with a weight metering mechanism on the girder transporting trolley 383, which comprises a section weight detecting mechanism, a balancing weight metering device and balancing weight lifting equipment, wherein the section weight detecting mechanism is arranged on the section lifting equipment and can detect the weight of the lifted bridge steel structure section and feed the detected weight information back to the balancing weight metering device, the balancing weight metering device comprises a balancing weight number calculating module, and the balancing weight number calculating module can calculate the number N of balancing weights required to be supplemented on the girder transporting trolley 383 according to the weight of the bridge steel structure section loaded on the girder transporting trolley 383 p And sends a balancing weight lifting instruction to the balancing weight lifting equipment to cause the balancing weight lifting equipment to lift N on the girder transporting trolley 383 p The balancing weight is blocked, so that the body is subjected to weight pressing operation. Or the balancing weight metering device comprises a balancing weight quality calculation module, and the balancing weight quality calculation module can calculate the weight G 'of the balancing weight required to be supplemented on the girder transporting trolley 383 according to the weight of the bridge steel structure section loaded on the girder transporting trolley 383' p And send a counterweight hoisting instruction to the counterweight hoisting equipment to promote counterweightThe weight of the block hoisting equipment hoisted on the girder transporting trolley 383 is G' p The balancing weight of the machine body is used for realizing the weight pressing operation on the machine body.
In the balancing weight number calculation module, balancing weight supplementing number N is integrated p Is calculated according to the formula:
in the weight block mass calculation module, the weight G 'of the weight block is integrated' p Is calculated according to the formula:
wherein:representing the weight of the bridge steel structure section m; g 0 Representing the weight of each counterweight.
Based on the advancing-anchoring system 3, the body of the cantilever bridge girder erection machine has two working modes, wherein one is a body advancing mode realized based on a body advancing driving device, and the other is a body anchoring mode realized based on a body anchoring device;
The body advancing mode specifically includes the following steps:
step one, assembling a weight system and an anti-reversing system on an anchoring section of a supporting truss system 1;
before the first step is carried out, the constraint between a front pivot anchor point and a main span steel structure of a main bridge is released, the travel of a front pivot jack is lifted, a front pivot cushion block is removed, and a front pivot track is paved; then reducing the stroke of the front fulcrum jack, dropping the wheels of the front fulcrum crane to the track for the front fulcrum crane, and arranging temporary wooden wedges at the front and rear wheels of the front fulcrum crane to enable the front fulcrum crane to keep a parking state; then supporting the rear anchor point by adopting a jack, releasing the constraint of the rear anchor point, and gradually reducing the stroke of the jack until the tank 346 falls to the ground and contacts with the bridge deck of the main bridge;
step two, starting a front supporting point travelling crane to drive a machine body to advance towards a preset splicing position of a steel bridge section of the bridge deck on the main bridge;
step three, when the numerical value F fed back by the anti-reversing tension meter reaches a preset tension threshold value Fm in the advancing process of the machine body, stopping the front supporting point travelling crane and starting the automatic clamping jaw equipment;
step four, a clamping jaw driving control mechanism of automatic clamping jaw equipment controls a servo driving mechanism to drive a clamping jaw mechanism to move according to a planned working path until a lifting lug hangs a site A2; at the moment, the code scanner on the clamping jaw mechanism scans the lifting lug hanging point identification tag in the working range, the obtained tag information is the lifting lug hanging point A2, the servo driving mechanism is indicated to move according to a preset working path, and then the next step is carried out; otherwise, updating the working path of the servo driving mechanism by taking the lifting lug hanging site information indicated by the current tag information as a reference, and then controlling the servo driving mechanism to move according to the updated working path of the servo driving mechanism until reaching a lifting lug hanging site A2;
Step five, repeating the step three and the step four until the machine body is advanced to a preset splicing position of the steel bridge section of the bridge deck on the main bridge, wherein at the moment, two ends of the anti-reversing hand hoist are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the hanging site An of the lifting lug;
the body anchoring mode specifically comprises the following steps:
and a detachable machine body anchoring device is arranged between the anchoring section of the supporting truss system 1 and the splicing preset position of the steel bridge section of the bridge deck on the main bridge, so that the machine body is anchored on the bridge deck on the main bridge, and preparation is made for conveying and splicing the subsequent steel structure section of the main bridge.

Claims (10)

1. The cantilever bridge girder erection machine comprises a machine body, wherein the machine body comprises a supporting truss system and an advancing-anchoring system, and the advancing-anchoring system comprises a machine body advancing driving device and a machine body anchoring device; the bottom of the anchoring section of the supporting truss system is provided with an organism advancing driving device, the supporting truss system is driven by the power of the organism advancing driving device to drive the supporting truss system to advance to the preset splicing position of the steel bridge section of the bridge deck on the main bridge, and the anchoring section of the supporting truss system is anchored at the preset splicing position of the steel bridge section of the bridge deck on the main bridge through a detachable organism anchoring device; the machine body advancing driving device comprises a front supporting point driving system, a front supporting point track system, a rear supporting point driving system, an anti-reversing system and a weight system, and the machine body anchoring device comprises a front supporting point anchoring system and a rear supporting point anchoring system; the method is characterized in that the weight system is built based on a girder transporting trolley and comprises a rear pivot middle chord, a weight tension hoist and a weight structure; the weight construction comprises a girder transporting trolley, a bridge steel structure section and a balancing weight, wherein the bridge steel structure section and the balancing weight are loaded on the girder transporting trolley; the weight tensioning hoist comprises two groups, wherein one group of weight tensioning hoist is vertically arranged, and two ends of the weight tensioning hoist are correspondingly connected with the front end of the girder transporting trolley and a hanging point arranged on a middle chord of the supporting truss system respectively; the rest group of weight tension blocks are arranged along the forward bridge direction, and two ends of the rest group of weight tension blocks are respectively correspondingly connected with the rear end of the girder transporting trolley and hanging points arranged on chords in rear supporting points of the supporting truss system;
The girder transporting trolley is provided with a weight metering mechanism which comprises a section weight detection mechanism, a balancing weight metering device and balancing weight lifting equipment, wherein the section weight detection mechanism is arranged on the section lifting equipment and can detect the weight of a lifted bridge steel structure section and feed detected weight information back to the balancing weight metering device; the balancing weight metering device determines the weight of the balancing weight loaded on the beam transporting trolley according to the weight of the received bridge steel structure section, and the balancing weight metering device is hoisted in place by controlling balancing weight hoisting equipment.
2. The cantilever bridge girder erection machine according to claim 1, wherein the balancing weight metering device comprises a balancing weight number calculating module capable of calculating the number N of balancing weights required to be supplemented on the girder transporting trolley according to the weight of the girder transporting trolley and the bridge steel structure section loaded on the girder transporting trolley p And hoist and mount the balancing weightThe equipment sends out a balancing weight hoisting instruction to cause the balancing weight hoisting equipment to hoist N on the beam transporting trolley p The balancing weight is blocked, so that the body is subjected to weight pressing operation;
in the balancing weight number calculation module, balancing weight supplementing number N is integrated p Is calculated according to the formula:
Wherein: ni represents a negative reaction force of any rear pivot point i; k represents an anti-overturning safety coefficient;representing the weight of the bridge steel structure section m; g c Representing the effective weight of the girder transporting trolley; g 0 Representing the weight of each counterweight.
3. The cantilever bridge girder erection machine according to claim 1, wherein the balancing weight metering device comprises a balancing weight mass calculation module capable of calculating the weight G 'of the balancing weight to be supplemented on the girder transporting trolley according to the weight of the girder steel structure section loaded on the girder transporting trolley' p And sends a balancing weight lifting instruction to the balancing weight lifting equipment,
to promote the weight of the balancing weight lifting equipment to lift the weight G 'on the beam transporting trolley' p The balancing weight of the machine body is arranged, so that the machine body is subjected to weight pressing operation;
in the weight block mass calculation module, the weight G 'of the weight block is integrated' p Is calculated according to the formula:
wherein: ni represents a negative reaction force of any rear pivot point i; k represents an anti-overturning safety coefficient;representing the weight of the bridge steel structure section m; g c Representing the effective weight of the girder transporting trolley; g 0 Representing the weight of each counterweight.
4. A cantilever bridge girder erection machine according to claim 2 or 3, wherein the anti-backup system comprises an anti-backup suspension lug, an anti-backup anchor lug, an anti-backup chain block and an anti-backup tension gauge;
A plurality of lifting lug hanging points are symmetrically distributed at the bottoms of the lower chords at two sides of the supporting truss system, and each lifting lug hanging point is provided with an anti-reversing hanging lifting lug along the transverse bridge direction of the main bridge; the number n of shackle hanging points disposed at the bottom of each side bottom chord of the lattice system is:
wherein L1 represents a single forward travel distance of the machine body, and L2 represents an uncontrolled sliding length threshold;
the arrangement sites of the anti-reversing hanging lifting lugs at the bottom of the lower chord member are a lifting lug hanging site A1, a lifting lug hanging site A2 … …, a lifting lug hanging site Aj … … and a lifting lug hanging site An from a front supporting point to a rear supporting point of the supporting truss system in sequence, wherein n is a positive integer; an anti-reversing anchoring lifting lug is arranged at the position close to the tops of the side webs at the two sides of the bridge deck, and the anchor point center of the anti-reversing anchoring lifting lug is adjacent to the front supporting point of the supporting truss system; the two anti-reversing anchoring lifting lugs are correspondingly first and second anti-reversing anchoring lifting lugs;
one end of the anti-reversing chain block is connected with the anti-reversing anchoring lifting lug on the same side through an anti-reversing tension meter, and the other end of the anti-reversing chain block is connected with the anti-reversing hanging lifting lug at any lifting lug hanging site Aj;
in the advancing process of the supporting truss system, an anti-reversing hanging lifting lug at a lifting lug hanging site A1 is connected with an anti-reversing anchoring lifting lug on the same side through an anti-reversing chain block; as the supporting truss system moves, the anti-reversing chain hoist is pulled, the value F fed back by the anti-reversing tension meter is promoted to change, and when the value F fed back by the anti-reversing tension meter reaches a preset tension threshold value Fm, the front fulcrum traveling crane is stopped or the front fulcrum traveling crane and the rear fulcrum traveling crane are simultaneously stopped, and the anti-reversing chain hoist is manually or automatically detached from the anti-reversing hanging lifting lug at the lifting lug hanging site A1 and then is hung on the anti-reversing hanging lifting lug at the lifting lug hanging site A2; and the machine body is reciprocated in this way until the machine body finishes a single forward distance, and at the moment, the two ends of the anti-reversing hand-pulling block are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the lifting lug hanging site An.
5. The cantilever bridge girder erection machine of claim 4, wherein the anti-backup system is equipped with an automated jaw apparatus when the anti-backup chain block is automatically detached from the anti-backup suspension shackle at shackle suspension point A1 and then automatically coupled to the anti-backup suspension shackle at shackle suspension point A2;
the automatic clamping jaw equipment comprises a servo driving mechanism, a clamping jaw mechanism, a lifting lug hanging site identification tag and a clamping jaw driving control mechanism;
each lifting lug hanging site is stuck with a lifting lug hanging site identification tag; the clamping jaw mechanism is provided with a code scanner, and the code scanner can identify corresponding lifting lug hanging sites by scanning lifting lug hanging site identification tags;
the clamping jaw driving control mechanism plans a corresponding working path according to the position information of each lifting lug hanging position point so as to control the servo driving mechanism to drive the clamping jaw mechanism to move to the corresponding lifting lug hanging position point Aj and match with the lifting lug hanging position point label information obtained by the code scanner on the clamping jaw mechanism, then controls the clamping jaw mechanism to move to the next lifting lug hanging position aj+1 after the anti-reversing chain block at the corresponding lifting lug hanging position point Aj is dissociated and match with the lifting lug hanging position label information obtained by the code scanner on the clamping jaw mechanism, and then connects the anti-reversing chain block to the anti-reversing hanging lifting lug corresponding to the lifting lug hanging position aj+1, and reciprocates in this way until the machine body completes a single advancing distance, and at the moment, the two ends of the anti-reversing chain block are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the lifting lug hanging position An.
6. The cantilever bridge girder erection machine according to claim 5, wherein the front fulcrum traveling crane comprises two front fulcrum traveling cranes, which are arranged at positions where two front fulcrums are arranged at the front end of the supporting truss system in a one-to-one correspondence manner, and each front fulcrum traveling crane adopts a double-wheel electric drive rail traveling crane;
the front fulcrum track system comprises a front fulcrum driving track, a track leveling structure arranged at the bottom of the front fulcrum driving track and front fulcrum driving parking structures arranged at two ends of the front fulcrum driving track; the front supporting point driving tracks are two, and correspond to the first front supporting point driving track and the second front supporting point driving track, wherein: the first front fulcrum driving rail is arranged along the small Gao Chengce bridge direction of the upper bridge deck, and the second front fulcrum driving rail is arranged along the large Gao Chengce bridge direction of the upper bridge deck; the two front fulcrum traveling crane are correspondingly arranged in the two front fulcrum traveling crane rails in a one-to-one correspondence manner, the length of each front fulcrum traveling crane rail can be matched with the single-movement distance of the machine body, and the distance between the two front fulcrum traveling crane rails is matched with the center distance of the main truss of the main bridge and the center distance of the supporting truss;
the track leveling structure is of a first track leveling structure, is constructed by matching with the small elevation side of the bridge deck of the main bridge, and comprises a first front supporting point track support, wherein the first front supporting point track support comprises a bolster and a plurality of first wedge-shaped steel plates uniformly distributed at the bottoms of the bolster and the first front supporting point driving track. The other type is a second track leveling structure which is matched with the large-elevation side of the main bridge deck and comprises a second front supporting point track support, wherein the second front supporting point track support comprises a plurality of second wedge-shaped steel plates uniformly distributed at the bottom of a second front supporting point travelling crane track.
7. The cantilever bridge girder erection machine according to claim 6, wherein the two-wheel electrically driven track crane comprises two driving wheel sets, a balance beam, a crane motor system and a crane brake system; the two driving wheel components are arranged at two ends of the balance beam, and the middle part of the balance beam is arranged on the support truss system through a connecting piece; the power output end of the driving motor system is connected with the driving wheel set in a linkage way, and meanwhile, the front supporting point driving is provided with a driving braking system.
8. The cantilever bridge girder erection machine according to claim 2 or 3, wherein the rear fulcrum traveling system comprises two rear fulcrum traveling systems which are respectively arranged at two sides of the bottom of the rear end of the supporting truss system, each rear fulcrum traveling system comprises a fixed connecting column, a pin adjusting section, a tank connecting section and a tank, the upper end of the fixed connecting column is fixedly connected with the bottom of the supporting truss system, the lower end of the fixed connecting column is fixedly connected with the pin adjusting section through a forward bridge direction pin, the pin adjusting section is also fixedly connected with the upper end of the tank connecting section through a transverse bridge direction pin, and the tank is arranged at the lower end of the tank connecting section.
9. The cantilever bridge girder erection machine according to claim 1, wherein the front fulcrum anchoring system comprises two types, one of which is a first front fulcrum anchoring structure, which is constructed in a manner of matching with the low elevation side of the upper bridge deck, and comprises a first front fulcrum anchoring supporting cushion block and a first front fulcrum anchoring supporting cushion beam; the other type is a second front supporting point anchoring structure which is constructed by matching with the large elevation side of the upper bridge deck, and comprises a second front supporting point anchoring supporting cushion block and a second front supporting point anchoring supporting cushion beam; one of the two front fulcrum traveling vehicles sequentially passes through a first front fulcrum anchoring supporting cushion block and a first front fulcrum anchoring supporting cushion beam to be arranged above a small Gao Chengce of the upper bridge deck, and the other front fulcrum traveling vehicle sequentially passes through a second front fulcrum anchoring supporting cushion block and a second front fulcrum anchoring supporting cushion beam to be arranged above a large Gao Chengce of the upper bridge deck;
the rear pivot anchoring system adopts a two-force rod system and comprises a rear anchor upper rod and a rear anchor lower rod, wherein the upper end of the rear anchor lower rod is connected with the lower end of the rear anchor upper rod in a positioning way through an anchoring pin shaft arranged along the transverse bridge direction, the lower end of the rear anchor lower rod is anchored by a transverse bridge preset on a main girder upper chord top plate of a main bridge to a temporary anchoring stiffening rib, and the upper end of the rear anchor upper rod is fixedly arranged at the bottom of a lower chord of the supporting truss system.
10. A method of using the forward-anchoring system in a cantilever bridge girder erection machine according to claim 1, wherein the machine body has two working modes by the action of the forward-anchoring system: one is a machine body advancing mode realized based on the machine body advancing driving device, and the other is a machine body anchoring mode realized based on the machine body anchoring device;
the body advancing mode specifically includes the following steps:
step one, assembling a weight system and an anti-reversing system on an anchoring section of a support truss system;
step two, starting a front supporting point travelling crane to drive a machine body to advance towards a preset splicing position of a steel bridge section of the bridge deck on the main bridge;
step three, when the numerical value F fed back by the anti-reversing tension meter reaches a preset tension threshold value Fm in the advancing process of the machine body, stopping the front supporting point travelling crane and starting the automatic clamping jaw equipment;
step four, a clamping jaw driving control mechanism of automatic clamping jaw equipment controls a servo driving mechanism to drive a clamping jaw mechanism to move according to a planned working path until a lifting lug hangs a site A2; at the moment, the code scanner on the clamping jaw mechanism scans the lifting lug hanging point identification tag in the working range, the obtained tag information is the lifting lug hanging point A2, the servo driving mechanism is indicated to move according to a preset working path, and then the next step is carried out; otherwise, updating the working path of the servo driving mechanism by taking the lifting lug hanging site information indicated by the current tag information as a reference, and then controlling the servo driving mechanism to move according to the updated working path of the servo driving mechanism until reaching a lifting lug hanging site A2;
Step five, repeating the step three and the step four until the machine body is advanced to a preset splicing position of the steel bridge section of the bridge deck on the main bridge, wherein at the moment, two ends of the anti-reversing hand hoist are respectively connected with the anti-reversing anchoring lifting lug and the anti-reversing hanging lifting lug at the hanging site An of the lifting lug;
the body anchoring mode specifically comprises the following steps:
and a detachable machine body anchoring device is arranged between the anchoring section of the supporting truss system and the splicing preset position of the steel bridge section of the bridge deck on the main bridge, so that the machine body is anchored on the bridge deck on the main bridge, and preparation is made for conveying and splicing the subsequent steel structure section of the main bridge.
CN202311556001.XA 2023-11-21 2023-11-21 Cantilever bridge girder erection machine and application method of advancing-anchoring system thereof Pending CN117661474A (en)

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Application Number Priority Date Filing Date Title
CN202311556001.XA CN117661474A (en) 2023-11-21 2023-11-21 Cantilever bridge girder erection machine and application method of advancing-anchoring system thereof

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CN117661474A true CN117661474A (en) 2024-03-08

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