CN117587706A

CN117587706A - Main bridge main span steel structure segment part assembly method based on cantilever bridge girder erection machine

Info

Publication number: CN117587706A
Application number: CN202311555999.1A
Authority: CN
Inventors: 徐声亮; 黄袁媛; 陈巨峰
Original assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Current assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Priority date: 2023-11-21
Filing date: 2023-11-21
Publication date: 2024-02-23

Abstract

The invention discloses a main bridge main span steel structure segment part assembly method based on a cantilever bridge girder erection machine. Including hoist and mount of first main bridge main span steel structure section and the hoist and mount of other main bridge main span steel structure sections of a plurality of sequence concatenation behind first main bridge main span steel structure section, wherein: the hoisting process of the first main bridge main span steel structure section comprises the following steps: step 01: hoisting lower chords at two sides of a main span steel structure section of a first main bridge by adopting a cantilever bridge girder erection machine, and temporarily fixing the end parts by adopting a code plate; step 02: the cantilever bridge girder erection machine is adopted to hoist four adjusting web members of the main span steel structure section of the first main bridge twice; step 03: the cantilever bridge girder erection machine is adopted to hoist two upper chords of the main span steel structure section of the first main bridge for two times, and temporary steel pipe support is adopted; step 04: and sequentially hoisting an upper bridge deck, a decorative plate and a cantilever plate of the main span steel structure section of the first main bridge by adopting a cantilever bridge girder erection machine.

Description

Main bridge main span steel structure segment part assembly method based on cantilever bridge girder erection machine

Technical Field

The invention relates to a main bridge main span steel structure section part assembly method based on a cantilever bridge girder erection machine, belonging to bridge construction auxiliary equipment.

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.

The above-mentioned document discloses a part type cantilever assembling aerial operation construction scheme of all-welded steel truss bridge, the mechanical property of the cantilever bridge girder erection machine and the precision control requirement of assembly of the parts are not fully considered, so that the precision and the efficiency of assembly of the parts are affected in the construction process.

Disclosure of Invention

The invention aims to provide a main bridge main span steel structure section part assembly method based on a cantilever bridge girder erection machine, which fully considers the mechanical property of the cantilever bridge girder erection machine and the precision control requirement of part assembly, effectively reduces the field operation difficulty and risk, saves labor in assembly, has stable structure and high comprehensive economic benefit.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

the main bridge main span steel structure section assembly method based on the cantilever bridge girder erection machine comprises an assembly hoisting and assembling method of a main bridge main span steel structure section of a first main bridge and an assembly hoisting and assembling method of a plurality of main bridge main span steel structure sections sequentially spliced after the main bridge main span steel structure section of the first main bridge, wherein the main bridge main span steel structure section of the first main bridge is assembled by a plurality of steel structure section assemblies, and the steel structure section assemblies comprise a lower layer bridge panel, two lower chord members, two adjusting web members, an upper layer bridge panel, two upper chord members and two overhanging panels; the two lower chords are correspondingly a first side lower chord and a second side lower chord, and are respectively arranged at two sides of the transverse bridge direction of the lower deck bridge deck; the two upper chords are correspondingly a first side upper chord member and a second side upper chord member, are respectively arranged at two sides of the transverse bridge direction of the upper deck bridge deck, the two overhanging panels are respectively arranged at the outer side of the upper deck bridge deck, and the upper chords and the lower chords at the same side are correspondingly connected through an adjusting web member; a method for hoisting and assembling parts of a main bridge main span steel structure section which is spliced in sequence after the main bridge main span steel structure section comprises the following steps:

Step one: hoisting the first side lower chord by adopting a cantilever bridge girder erection machine and ensuring that the first side lower chord is hoisted in place;

step two: the first side lower chord member is connected with the lower chord member corresponding to the main span steel structure section of the previous main bridge by adopting 12 mm-16 mm girth welds, and during the period, a cantilever bridge girder erection machine is adopted to hoist the second side lower chord member and ensure that the second side lower chord member is hoisted in place;

step three: sectional assembly lower bridge deck boards;

step four: the circumferential weld joint of the lower chord rod is completely arranged;

step five: sequentially hoisting and adjusting web members by using a cantilever bridge girder erection machine, and realizing temporary positioning between temporary connecting code plates and corresponding side lower chords;

step six: hoisting the first side upper chord by adopting a cantilever bridge girder erection machine, and completing temporary positioning of the first side upper chord after the first side upper chord is hoisted in place; in the temporary positioning operation process of the first side upper chord, a cantilever bridge girder erection machine is adopted to hoist the second side upper chord, and the temporary positioning of the second side upper chord is completed after the second side upper chord is hoisted in place;

step seven: adjusting the positions of the web members according to the upper chord member and the lower chord member, and then adopting welding seams to finish connection;

step eight: sectional assembling of the upper bridge deck;

step nine: and (5) sectional assembling the cantilever panel.

Preferably, the specific way of ensuring that the first and second side bottom chords are hoisted in place is: the ends of the first side lower chord member and the second side lower chord member are connected by adopting a code plate, and the cantilever ends are adjusted by adopting a mechanical jack so as to ensure the positioning in the elevation direction; the transverse bridge directional positioning of the first side lower chord member and the second side lower chord member is realized by a transverse bridge directional moving system of the cantilever bridge girder erection machine; the forward positioning of the first and second side bottom chords is controlled by the lifting equipment of the cantilever bridge girder erection machine and the support of the main span steel structure section of the previous section of main bridge.

Preferably, the temporary positioning operation of the first and second side upper chords specifically includes: temporary positioning is achieved between the temporary connecting code plates and the corresponding side adjusting web members, then temporary supporting frames are used for supporting the temporary connecting code plates between the corresponding side upper chords and the corresponding side lower chords, and 12-16 mm girth welds are adopted at the end portions to be spliced with the upper chords of the main span steel structure sections of the previous main bridge.

Preferably, the cantilever bridge girder erection machine comprises a supporting truss system, an advancing-anchoring system, a girder transporting system and a multidirectional transportation system; the advancing-anchoring system comprises a machine body advancing driving device and a machine body anchoring device, wherein the machine body advancing driving device is arranged at the bottom of an anchoring section of the support truss system, and the machine body anchoring device is arranged between the anchoring section of the support truss system and an upper bridge deck in a detachable connection mode; the girder transporting system is arranged on the upper bridge deck and is positioned in an area surrounded by a bottom truss of the supporting truss system; the multi-directional transportation system is arranged on a middle truss of the supporting truss system and comprises hoisting equipment, a forward-bridge-direction track beam, a transverse-bridge-direction track system and a transverse-bridge-direction moving system; the hoisting equipment is movably arranged on the forward bridge track beam; the forward-bridge track beams are arranged along the forward bridge direction of the main bridge steel structure and comprise anchoring section track beams and cantilever section track beams, and temporary connection structures capable of realizing splicing/separating of the anchoring section track beams and the cantilever section track beams; the anchoring section track beam is arranged in an anchoring area of the support truss system and is fixedly connected with a cross beam of the anchoring area of the support truss system; the cantilever section track beam is arranged in a cantilever area of the support truss system, is movably arranged on a transverse connecting beam of the cantilever area of the support truss system through a transverse bridge to the track system, and is connected with a power output end of the transverse bridge to the moving system; the cantilever rail beam is movable along the bridge to the rail system by the power of the bridge to the moving system in a state of being separated from the anchor rail Liang Jie.

Preferably, the steel structure segment parts are transported to a bridge deck transportation crane through a portal crane or a crawler crane, the bridge deck transportation crane automatically transports from a side span to a girder transporting system of the cantilever bridge girder erection machine and is transported by the girder transporting system to a loading area of a multi-directional transportation system, the multi-directional transportation system automatically transports the steel structure segment parts from the loading area to a splicing site for unloading, and the multi-directional transportation system comprises the following specific implementation steps of:

step 1.1, hoisting a target component in a loading area through hoisting equipment, wherein the target component is any component of a main bridge steel structure section;

step 1.2, starting the lifting equipment, so that the lifting equipment carries the target component to move along the anchoring section track beam until the lifting equipment carries the target component to move out of the anchoring section track beam, and then moves into the cantilever section track beam and moves to a preset position along the cantilever section track beam;

step 1.3, releasing a temporary connection structure at the joint position of the anchoring section track beam and the cantilever section track beam so that the anchoring section track beam and the cantilever section track beam are mutually independent;

step 1.4, starting a transverse bridge moving system, so that the cantilever section track beam moves along the transverse bridge to the track beam until a target component carried by hoisting equipment suspended at the lower end of the cantilever section track beam moves laterally to a target position;

Step 1.5, starting the lifting equipment until the lifted target member is lowered to a target position, and then recovering a lifting hook of the lifting equipment;

step 1.6, a transverse bridge directional moving system is reversely started, so that the cantilever section track beam moves and resets along the transverse bridge directional track Liang Fanxiang until the seam end of the cantilever section track beam is aligned with the seam end of the anchoring section track beam;

step 1.7, splicing the anchoring section track beam and the cantilever section track beam into a complete full-length forward bridge track beam by adopting a temporary connection structure at the joint position of the anchoring section track beam and the cantilever section track beam;

and 1.8, reversely starting the hoisting equipment, so that the hoisting equipment moves along the forward bridge to the track beam until the hoisting equipment returns to the position of hoisting the target member on the track beam of the anchoring section so as to prepare for hoisting of the next target member.

Preferably, after the assembly of the main bridge main span steel structure section of the previous section is completed, the cantilever bridge girder erection machine is shifted through an advancing-anchoring system; in the advancing-anchoring system, 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 displacement of the cantilever bridge girder erection machine specifically comprises the following steps:

step 2.1: loading a lower chord of a main span steel structure section of a main bridge of the next section on a girder transporting vehicle, moving to the vicinity of the tail part of a cantilever crane bridge, lifting the girder transporting vehicle to a separation track by 2-3 cm by using 2 electric hoists, providing vertical support for the girder transporting vehicle by using 4 chain hoists, connecting the girder transporting vehicle with the lower chord of a supporting truss system by using another 4 chain hoists to provide horizontal constraint, loading proper balancing weights on the girder transporting vehicle, and thus completing the construction of a weighting system of an advancing-anchoring system;

step 2.2: releasing the constraint between the front pivot anchor point and the main bridge main span steel structure, lifting the travel of the front pivot jack, removing the front pivot cushion block, and paving a front pivot driving track;

step 2.3: reducing the travel of the front supporting point jack, and dropping the wheels of the front supporting point crane to the track for the front supporting point crane;

step 2.4: temporary wooden wedges are arranged at the front wheel and the rear wheel of the front fulcrum traveling crane, so that the front fulcrum traveling crane keeps a parking state;

step 2.5: supporting a rear anchor point by using a jack, then releasing the constraint of the rear anchor point, and gradually reducing the stroke of the jack until the tank falls to the ground and contacts with a bridge deck of a main bridge;

Step 2.6: an anti-reversing system is arranged and moves forwards under the traction action of a motor of a front supporting point travelling crane;

step 2.7: starting the front supporting point driving again and moving to the target position;

step 2.8: the front fulcrum driving is adjusted to a parking state, the front wheel and the rear wheel are fixed by wedge-shaped wood blocks, and then the rear anchor jack is lifted to be adjusted to a target state;

step 2.9: cutting a rear anchor vertical rod to a target length, welding the rear anchor vertical rod and a main bridge deck plate into a whole, and finally connecting the rear anchor vertical rod and the rear anchor point through a pin shaft;

step 2.10: lifting a front supporting point jack, then removing a track for front supporting point travelling crane, and setting a front supporting point cushion block; the front fulcrum cushion block is connected with the front fulcrum travelling crane by bolts and is connected with the bridge deck of the main bridge by welding seams;

step 2.11: and (3) hanging the girder transporting vehicle by adopting the electric hoist, then removing the vertical and lateral electric hoist arranged in the step (2.1), then dropping the girder transporting vehicle to a transportation track, and completing the displacement of the cantilever bridge girder erection machine, and hanging all the constituent members of the main bridge main span steel structure section of the next section by the cantilever bridge erection machine.

Preferably, the lattice truss system is assembled on site by using a plurality of factory-prefabricated modular components; the method comprises the following steps of:

Step 3.1, prefabricating each component of the supporting truss system in a factory and then transporting the prefabricated component to a construction site:

each component member of the support truss system comprises a movable front support rod module, a front support point parallel connection, a movable rear support rod module, a rear support point parallel connection, an anchoring section truss connecting section, a cantilever section truss connecting section, a lower connecting chord, a lower inclined web member, an upper inclined web member and a horizontal pull member; wherein:

the number of the movable front support rod modules and the number of the movable rear support rod modules are two; the number of the front fulcrum parallel connection, the rear fulcrum parallel connection, the anchoring section truss connecting sections and the cantilever section truss connecting sections is one; the number of the lower connecting chords is one; the number of the lower inclined web members is four; the number of the upper inclined web members is four; the number of the horizontal pull rods is eight;

step 3.2, installing a movable front strut module on site;

step 3.3, the front pivot point is mounted on site in parallel;

step 3.4, installing a movable rear support rod module on site;

step 3.5, the pivot is connected in parallel after field installation;

step 3.6, installing a lower connecting chord on site;

step 3.7, integrally hoisting the truss connecting sections of the anchoring section;

step 3.8, installing a lower diagonal web member, a left upper diagonal web member and a horizontal pull rod system of an anchor section truss connecting section;

Step 3.9, integrally hoisting the truss connecting section of the cantilever section;

and 3.10, installing a horizontal pull rod system of the right upper diagonal web member and the cantilever truss connecting section.

Preferably, the method for hoisting and assembling the parts of the main bridge main span steel structure section comprises the following steps:

step 01: the cantilever bridge girder erection machine is adopted to hoist the lower chords at two sides of the main span steel structure section of the first main bridge twice, and the end parts are temporarily fixed by adopting a code plate;

step 02: the cantilever bridge girder erection machine is adopted to hoist four adjusting web members of the main span steel structure section of the first main bridge twice;

step 03: the cantilever bridge girder erection machine is adopted to hoist two upper chords of the main span steel structure section of the first main bridge for two times, and temporary steel pipe support is adopted;

step 04: and sequentially hoisting an upper bridge deck, a decorative plate and a cantilever plate of the main span steel structure section of the first main bridge by adopting a cantilever bridge girder erection machine.

Based on the technical objects, compared with the prior art, the invention has the following advantages:

the invention fully considers the mechanical property of the cantilever bridge girder erection machine and the precision control requirement of assembly of parts, effectively reduces the difficulty and risk of field operation, saves labor in assembly, has stable structure and high comprehensive economic benefit.

Drawings

FIG. 1 is a schematic structural view of a main bridge main span steel structural section;

FIG. 2 is a schematic flow diagram of a main bridge main span steel structure segment part assembly method based on a cantilever bridge girder erection machine;

FIG. 3 is a schematic structural view of a cantilever bridge girder erection machine according to the present invention;

FIG. 4 is a schematic illustration of the structure of the lattice system of FIG. 3 in the forward direction;

FIG. 5 is a modular assembly flow diagram of a lattice system;

FIG. 6 is a layout of a transverse-bridge track system of the multi-way transport system of the present invention on a main truss support system;

FIG. 7 is a schematic diagram of the structure of a forward-bridge track system of the multi-directional transportation system of the present invention;

FIG. 8 is a schematic illustration of a cantilever section track transverse braking system (cross-bridge) in a multi-directional transport system;

FIG. 9 is an enlarged partial view of the cantilever section track transverse brake system of FIG. 8 in a transverse track car body train portion;

101. a first upper diagonal web member; 102. a second upper diagonal web member;

111. driving with a front pivot; 112. a front pivot lower chord; 113. a front pivot lower vertical rod; 114. a front pivot center chord; 115. a vertical rod in the front pivot; 116. a front pivot upper chord; 117. a vertical rod is arranged on the front pivot;

121. a rear anchor lower rod; 122. the rear anchor is arranged on the rod; 123. a jack; 124. a tank; 125. a rear anchor point lower chord; 126. a rear anchor point is arranged on the lower vertical rod; 127. a rear anchor middle chord; 128. a vertical rod is arranged on the rear anchor point; 129. a rear anchor point upper chord;

13. The lower part is connected with a chord;

141. a first lower diagonal web member; 142. a second lower diagonal web member;

151. the upper connecting chord member; 152. the middle connecting chord; 153. the main truss is provided with a first connecting vertical rod; 154. the main truss is connected with the vertical rod; 155. the main truss first middle diagonal web member;

161. the main truss second middle diagonal web member; 162. the main truss is a third middle inclined web member;

171. a boom lower chord; 172. a cantilever upper chord; 173. a cantilever first vertical rod; 174. the cantilever second vertical rod; 175. a cantilever third vertical rod; 176. cantilever first middle inclined web member; 177. cantilever second middle inclined web member;

181. cantilever third middle inclined web member;

191. an anchor beam is arranged on the first operation platform; 192. an anchor beam is arranged on the second operation platform;

1-1-1, a first boom upper chord; 1-1-2, a second cantilever upper chord; 1-1-3, a first cantilever vertical rod; 1-1-4, a second cantilever vertical rod; 1-1-5, a first boom lower chord; 1-1-6, a second boom lower chord; 1-1-7 the first cantilever outwards protrudes the inclined beam; 1-1-8 the second cantilever outwards protrudes the inclined beam; 1-1-9, transverse connecting beams; 1-1-10, a left cantilever section of a transverse track; 1-1-11, a right cantilever section of a transverse track; 1-1-12, transverse track beam sections; 1-1-13, a supporting beam is arranged on the end part of the cantilever; 1-1-14, cantilever end cantilever beam;

1-2, along the bridge to the track beam; 1-2-1, anchoring section track beams; 1-2-2, cantilever section track beams; 1-2-3, wherein the cross beam of the anchoring section is connected with a vertical rod; 1-2-4, anchoring section cross beams; 1-2-5 parts of cantilever section cross beam; 1-2-7, a transverse track trolley system;

1-2-23, a first brake hoist; 1-2-24, a second brake winch; 1-2-25, a left middle chord fixed pulley; 1-2-26, a brake traction rope; 1-2-27, a right middle chord fixed pulley; 1-2-28, fixed pulleys on the transverse track; 1-2-29, fixed pulleys in transverse tracks; 1-2-30, steel connecting piece; 1-2-31, a fixed pulley under a transverse track; 1-2-32, and braking a stiffening steel plate to the left side of the track beam along the bridge; 1-2-33, stiffening steel plates along the bridge to the track girder; 1-2-34, and braking stiffening steel plates along the bridge to the right side of the track beam.

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).

Example 1

The embodiment discloses a main bridge main span steel structure section part assembly method based on a cantilever bridge girder erection machine, which comprises a part hoisting and assembly method of a first main bridge main span steel structure section and a part hoisting and assembly method of a plurality of main bridge main span steel structure sections which are spliced in sequence behind the first main bridge main span steel structure section.

The main bridge main span steel structure sections which are spliced in sequence behind the main bridge main span steel structure sections are spliced by a plurality of steel structure section parts, and the concrete constitution of the steel structure section parts is shown in figure 1 and comprises a lower bridge deck plate, two lower chord members, two adjusting web members, an upper bridge deck plate, two upper chord members and two overhanging panels; the two lower chords are correspondingly a first side lower chord and a second side lower chord, and are respectively arranged at two sides of the transverse bridge direction of the lower deck bridge deck; the two upper chords are correspondingly a first side upper chord member and a second side upper chord member, the upper chords and the second side upper chord member are respectively arranged on two sides of the transverse bridge direction of the upper deck bridge deck, the two overhanging panels are respectively arranged on the outer side of the upper deck bridge deck, and the upper chords and the lower chords on the same side are correspondingly connected through an adjusting web member.

A method for hoisting and assembling parts of a main bridge main span steel structure section after a plurality of main bridge main span steel structure sections are spliced in sequence, as shown in figure 2, specifically comprises the following steps:

In order to ensure that the first and second side bottom chords are hoisted in place, the invention adopts the following embodiments: the ends of the first side lower chord member and the second side lower chord member are connected by adopting a code plate, and the cantilever ends are adjusted by adopting a mechanical jack so as to ensure the positioning in the elevation direction; the transverse bridge directional positioning of the first side lower chord member and the second side lower chord member is realized by a transverse bridge directional moving system of the cantilever bridge girder erection machine; the forward positioning of the first and second side bottom chords is controlled by the lifting equipment of the cantilever bridge girder erection machine and the support of the main span steel structure section of the previous section of main bridge.

Step three: sectional assembly lower bridge deck boards;

in this step, the temporary positioning operation of the first and second side upper chords specifically includes: temporary positioning is achieved between the temporary connecting code plates and the corresponding side adjusting web members, then temporary supporting frames are used for supporting the temporary connecting code plates between the corresponding side upper chords and the corresponding side lower chords, and 12-16 mm girth welds are adopted at the end portions to be spliced with the upper chords of the main span steel structure sections of the previous main bridge.

step eight: sectional assembling of the upper bridge deck;

step nine: and (5) sectional assembling the cantilever panel.

Example 2

The embodiment discloses a cantilever bridge girder erection machine, and the specific structure is shown in figure 3. According to the different functions of each component of the cantilever bridge girder erection machine, the cantilever bridge girder erection machine is divided into 5 parts:

1) The support truss system is a core stress structure system, the concrete structure is shown in fig. 4, and the whole support truss system is a 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.

2) An advancing-anchoring system for providing the functions of supporting (anchoring) and advancing of the supporting truss system, comprising an advancing driving device of the machine body and an anchoring device of the machine body; 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 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.

3) The multi-directional transportation system mainly bears the hoisting operation from a girder transporting system to an operation platform system of each component of the main bridge steel structure section, and comprises hoisting equipment, a forward-bridge-to-track girder, a transverse-bridge-to-track system and a transverse-bridge-to-moving system. The multidirectional transportation system is arranged on the support truss system;

4) The operation platform system is mainly used for bearing the assembly operation of each component member of the current main bridge steel structure section hoisted by the multidirectional transportation system and providing an operation space for construction machinery and operators;

5) And the girder transporting system bears the transportation function of each component of the current main bridge steel structure section so as to transport each component of the current main bridge steel structure section hoisted by the crawler crane or the portal crane in the side span area to a loading area of the multidirectional transportation system, wherein the girder transporting trolley, the girder transporting track and the like.

In order to reduce the difficulty of on-site assembly of parts and improve the rigidity and bearing capacity of a structural system, the invention integrates a support truss system and front and rear fulcrum traveling cranes of a machine body traveling driving device so as to assemble a movable support truss system on site by adopting a plurality of factory prefabricated modularized components. In order to ensure the requirements of the 'vertical bearing capacity' and the 'vertical rigidity' of the movable supporting truss system, the specific constitution of prefabricated modular components of each factory and the prefabrication of the mutually on-site splicing nodes and the connecting assemblies thereof need to be considered, and the modular assembly is carried out on the assembled main bridge deck by the following assembly method:

Step one, prefabricating each component of a supporting truss system in a factory and then transporting the prefabricated component to a construction site

Each component of the supporting truss system comprises a movable front supporting rod module (and a side supporting system is welded at a factory-a first outer cantilever beam), a front supporting point parallel connection, a movable rear supporting rod module (and a side supporting system is welded at a factory-a second outer cantilever beam), a rear supporting point parallel connection, an anchoring section truss connecting section, a cantilever section truss connecting section, a lower connecting chord member, a lower inclined web member, an upper inclined web member and a horizontal pull member; wherein:

the number of the movable front support rod modules and the number of the movable rear support rod modules are two; the number of the front fulcrum parallel connection, the rear fulcrum parallel connection, the anchoring section truss connecting sections and the cantilever section truss connecting sections is one; the number of the lower connecting chords is one; the number of the lower inclined web members is four; the number of the upper inclined web members is four; the number of the horizontal pull rods is eight, and every two horizontal pull rods form a horizontal cross pull rod system;

the movable front support rod module is a factory prefabricated modularized component and comprises a front support point traveling crane, a front support point lower chord member, a front support point lower vertical rod, a front support point middle chord member, a front support point middle vertical rod, a front support point upper chord member and a front support point upper vertical rod.

The movable rear supporting rod module is a prefabricated modular component of a factory and comprises a rear anchor lower rod, a rear anchor upper rod, a jack, a tank, a rear anchor lower chord, a rear anchor lower vertical rod, a rear anchor middle chord, a rear anchor upper vertical rod and a rear anchor upper chord.

The anchoring section truss connecting section is a factory prefabricated modularized component and comprises two anchoring section connecting trusses which are parallel to each other and are arranged along the forward bridge direction and an anchoring section transverse connecting system which connects the two anchoring section connecting trusses and is arranged along the transverse bridge direction; the anchor section truss connection comprises an upper connecting chord member, a middle connecting chord member, two main truss connecting vertical rods and a main truss middle inclined web member, wherein the two main truss connecting vertical rods are correspondingly a main truss first connecting vertical rod and a main truss second connecting vertical rod.

The cantilever section truss connecting section is a factory prefabricated modular component and comprises two cantilever section connecting trusses which are parallel to each other and are arranged along the forward direction of the bridge, and a cantilever section transverse connecting system which connects the two cantilever section connecting trusses and is arranged along the transverse direction of the bridge. The cantilever section connecting truss comprises an upper cantilever chord member, a lower cantilever member, three cantilever vertical rods and two middle cantilever inclined web members, wherein the three cantilever vertical rods are correspondingly a first cantilever vertical rod, a second cantilever vertical rod and a third cantilever vertical rod.

Step two, field installation of movable front support rod module

And hoisting the two movable front support rod modules to preset positions on the bridge floor of the construction site, and temporarily fixing by adopting a chain block and a steel wire rope to prevent the movable front support rod modules from toppling over.

Step three, front pivot parallel connection for field installation

The front pivot is in an integral structure, two matched splicing nodes are arranged on the movable front support rod module, and the front pivot can be mounted between the two movable front support rod modules in a parallel mode by bolts.

Step four, field installation movable rear support rod module

And hoisting the two movable rear support rod modules to a preset position on the bridge deck of the construction site, and temporarily fixing by adopting a chain block and a steel wire rope to prevent the movable rear support rod modules from toppling over.

Step five, post-site installation fulcrum parallel connection

The rear supporting point parallel connection is of an integral structure, two matched splicing nodes are arranged on the movable rear supporting rod modules, and the rear supporting point parallel connection can be installed between the two movable rear supporting rod modules by bolts.

Step six, mounting lower connecting chord on site

The lower connecting chord is arranged between the front pivot lower chord of the movable front supporting rod module and the rear anchor lower chord of the movable rear supporting rod module, and the splicing position adopts a splicing connecting component to splice the front pivot lower chord and the rear anchor lower chord.

Step seven, integrally hoisting truss connecting sections of anchoring sections

The method comprises the steps of integrally hoisting an anchoring section truss connecting section between a movable front supporting rod module and a movable rear supporting rod module, ensuring that two ends of an upper connecting chord of the anchoring section truss connecting section are aligned with a front supporting point upper chord of the movable front supporting rod module and a rear anchor point upper chord of the movable rear supporting rod module respectively, aligning two ends of a middle connecting chord of the anchoring section truss connecting section with a front supporting point middle chord of the movable front supporting rod module and a rear anchor point middle chord of the movable rear supporting rod module respectively, and then splicing the two by adopting a splicing connecting assembly at a splicing site.

Step eight, installing a lower diagonal web member, a left upper diagonal web member and a horizontal pull rod system of an anchor section truss connecting section

And the first lower diagonal web member is arranged between the splicing joint G' of the middle connecting chord member and the splicing joint G of the movable rear supporting rod module, and the splicing of the middle connecting chord member and the splicing joint G at the splicing position is realized by adopting a splicing connecting component.

And the second lower diagonal web member is arranged between the splicing joint B' of the middle connecting chord member and the splicing joint B of the movable front support rod module, and the splicing of the middle connecting chord member and the splicing joint B at the splicing position is realized by adopting a splicing connecting component.

The left upper diagonal web member (namely the first upper diagonal web member) is arranged between the truss splicing node C of the movable front strut module and the truss splicing node C' of the upper connecting chord member, and the splicing of the two at the splicing site is realized by adopting bolts.

And a horizontal cross pull rod system is respectively arranged between the transverse connecting cross beams close to the front pivot flat-connection and the rear pivot flat-connection, so that the overall rigidity of the structure is improved.

Step nine, integrally hoisting cantilever truss connecting section

And integrally hoisting the cantilever truss connecting section to a preset position of the movable front support rod module, ensuring that the connecting end of the upper connecting chord of the cantilever truss connecting section is aligned with the upper chord of the front pivot of the movable front support rod module, the connecting end of the middle connecting chord is aligned with the middle chord of the front pivot of the movable front support rod module, and then adopting a splicing connecting assembly at a splicing site to splice the two.

And step ten, installing a horizontal pull rod system of the right upper inclined web member and the cantilever truss connecting section.

The right upper diagonal web member (namely the second upper diagonal web member) is arranged between the truss splicing node D of the movable front strut module and the truss splicing node D' of the cantilever upper chord member, and the splicing of the two at the splicing site is realized by adopting bolts.

And a horizontal cross pull rod system is arranged between the transverse connecting cross beams of the cantilever truss connecting sections, so that the overall rigidity of the structure is improved.

Through implementation of the steps one to ten, the construction of the whole support truss system can be completed.

Example 3

The steel structure segment parts are transported to a bridge deck transportation travelling crane through a portal crane or a crawler crane, the bridge deck transportation travelling crane is automatically transported from a side span to a beam transporting system of the cantilever bridge girder erection machine and is transported to a loading area of a multi-directional transportation system by the beam transporting system, and the multi-directional transportation system automatically transports the steel structure segment parts from the loading area to a splicing site for unloading.

The multi-directional transportation system comprises hoisting equipment, a forward-bridge-direction track beam, a transverse-bridge-direction track system and a transverse-bridge-direction moving system; wherein: the hoisting equipment is movably arranged on the forward bridge track beam; the forward bridge track beam comprises an anchoring section track beam, a cantilever section track beam and a temporary connection structure capable of realizing splicing/separating of the anchoring section track beam and the cantilever section track beam; the anchoring section track beam is arranged in an anchoring area of the support truss system and is fixedly connected with a cross beam of the anchoring area of the support truss system; the cantilever section track beam is arranged in a cantilever area of the support truss system, is movably arranged on a transverse connecting beam of the cantilever area of the support truss system through a transverse bridge to the track system, and is connected with a power output end of the transverse bridge to the moving system; the cantilever section track beam can move along the transverse bridge to the track system by the power action of the transverse bridge to the moving system in a state of being separated from the anchoring section track Liang Jie. The temporary connection structure comprises a temporary assembling positioning code plate and a plurality of splicing bolts, wherein one side of the temporary assembling positioning code plate is provided with bolt holes A2 matched with bolt holes A1 at the splicing seam position of the track beam of the anchoring section, and the other side of the temporary assembling positioning code plate is provided with bolt holes B2 matched with bolt holes B1 at the splicing seam position of the track beam of the cantilever section; during splicing, aligning the splicing end of the cantilever section track beam with the splicing end of the anchoring section track beam, aligning the bolt holes A2 and B2 on the temporary splicing positioning code plate with the bolt holes A1 and B1 on the anchoring section track beam respectively, and finally fastening by adopting splicing bolts to finish splicing the two; when the cantilever section track beam and the anchoring section track beam are separated, each splicing bolt is detached firstly, and then the temporary splicing positioning code plate is taken down.

The transverse bridge-to-track system comprises a plurality of transverse track beams, each transverse track beam comprises a transverse track beam section and transverse track cantilever sections symmetrically arranged at two sides of the transverse track beam section; the track flanges of the transverse track beam sections are connected with transverse connecting beams above the track flanges by adopting beveled penetration weld seams; the inner side end of the cantilever section of the transverse track is connected with the cantilever lower chord member of the supporting truss system through a stiffening steel plate, and the outer side end of the cantilever section of the transverse track is supported at the cantilever upper chord member of the supporting truss system through a cantilever oblique beam; no constraint is arranged between the transverse track beam section and the transverse track cantilever section; the end of the lateral track cantilever section is provided with a parking construction a.

The transverse bridge-to-track moving system comprises a transverse bridge-to-track running vehicle and two sets of braking devices which are arranged in close proximity, wherein: the transverse bridge-to-track crane is movably arranged on the transverse bridge-to-track beam, and the cantilever section track beam is suspended and arranged on the fixed part of the transverse bridge-to-track crane; each set of braking equipment comprises a braking chain block and a braking traction wire, the braking chain block is arranged on the supporting truss system, one end of the braking traction wire is connected with the power output end of the braking chain block, the other end of the braking traction wire is connected with a braking point arranged on the transverse bridge track traveling crane, and the braking traction wire is arranged in an inverted U shape after being guided by a braking guide pulley block arranged on the supporting truss system. The four braking guide pulley blocks are all arranged, each braking guide pulley block comprises a middle chord fixed pulley, a transverse track upper fixed pulley, a transverse track lower fixed pulley and a transverse track middle fixed pulley, for avoiding diagonal rods, main truss straight vertical rods and the like of a supporting truss system, the single-section deviation angle of a traction line is calculated by not more than 3 degrees, and the arrangement of each fixed pulley of the braking guide pulley block meets the following conditions: the fixed pulley of the middle chord member and the fixed pulley on the transverse track are positioned in the same vertical plane; the fixed pulleys under the transverse track and the center of the along-bridge track beam braking stiffening steel plate are positioned on the same vertical plane, and the along-bridge track beam braking stiffening steel plate is arranged on the cantilever track beam and penetrates through the along-bridge track beam braking stiffening steel plate and the cantilever track beam to form the braking point; the forward bridge direction of the fixed pulleys in the transverse track is positioned in the forward bridge direction middle of the upper and lower fixed pulleys of the transverse track, the transverse bridge is provided with a steel connecting piece towards the side edge of the end part of the track beam, and the steel connecting piece is connected with the transverse bridge towards the track beam by adopting an upper flange weld joint and a lower flange weld joint.

The specific implementation steps of the multidirectional transportation system comprise:

Example 4

After the main bridge main span steel structure section of the previous section is assembled, the cantilever bridge girder erection machine is shifted through an advancing-anchoring system; in the advancing-anchoring system, 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 front supporting point travelling crane comprises two front supporting points which are respectively arranged at two sides of the bottom of the front end of the supporting truss system to form the supporting truss system; each front supporting point traveling crane adopts a double-wheel electric drive rail traveling crane and 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.

The front fulcrum rail system comprises a front fulcrum driving rail, a rail leveling structure arranged at the bottom of the front fulcrum driving rail and front fulcrum driving parking structures arranged at two ends of the front fulcrum driving rail; the front fulcrum driving tracks are arranged for each front fulcrum driving, the length of each front fulcrum driving track can be matched with the single-movement distance of the machine body, and the distance between the two front fulcrum driving tracks 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, wherein one type is a first track leveling structure which is constructed by matching with the large-elevation side of an upper bridge deck, and comprises a plurality of first wedge-shaped steel plates uniformly distributed at the bottom of a front supporting point driving track; the other type is a second track leveling structure which is matched with the small elevation side of the main bridge deck and comprises a bolster and a plurality of second wedge-shaped steel plates uniformly distributed at the bottoms of the bolster and the front supporting point driving track.

The front fulcrum anchoring system comprises a first front fulcrum anchoring structure which is matched with the high-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 small 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; the first front supporting point anchoring supporting cushion block and the first front supporting point anchoring supporting cushion beam are sequentially arranged above the large Gao Chengce of the upper bridge deck, and the rest of the first front supporting point anchoring supporting cushion block and the second front supporting point anchoring supporting cushion beam are sequentially arranged above the small Gao Chengce of the upper bridge deck.

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 fixedly connected with the pin shaft adjusting section through a forward bridge, the pin shaft adjusting section is fixedly connected with the pin shaft adjusting section, and the pin shaft adjusting section can be fixedly connected with the upper end of the tank connecting section through a transverse bridge. At the lower end of the tank connecting section, one tank is arranged along the transverse bridge direction, and two tanks are arranged along the bridge direction.

The anti-reversing system comprises an anti-reversing hanging lifting lug, an anti-reversing anchoring lifting lug and an anti-reversing chain block for connecting the corresponding anti-reversing hanging lifting lug and the anti-reversing anchoring lifting lug.

The weight system comprises a weight structure and two groups of weight tension blocks; one group of the weight tension blocks is vertically arranged, and two ends of the two groups of weight tension blocks are correspondingly connected with the upper end of the weight structure and hanging points arranged on the middle chord member 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 weight structure and hanging points arranged on chords in rear supporting points of the supporting truss system.

Claims

1. The main bridge main span steel structure section assembly method based on the cantilever bridge girder erection machine comprises an assembly hoisting and assembling method of a main bridge main span steel structure section of a first main bridge and an assembly hoisting and assembling method of a plurality of main bridge main span steel structure sections sequentially spliced after the main bridge main span steel structure section of the first main bridge, wherein the main bridge main span steel structure section of the first main bridge is assembled by a plurality of steel structure section assemblies, and the steel structure section assemblies comprise a lower layer bridge panel, two lower chord members, two adjusting web members, an upper layer bridge panel, two upper chord members and two overhanging panels; the two lower chords are correspondingly a first side lower chord and a second side lower chord, and are respectively arranged at two sides of the transverse bridge direction of the lower deck bridge deck; the two upper chords are correspondingly a first side upper chord member and a second side upper chord member, are respectively arranged at two sides of the transverse bridge direction of the upper deck bridge deck, the two overhanging panels are respectively arranged at the outer side of the upper deck bridge deck, and the upper chords and the lower chords at the same side are correspondingly connected through an adjusting web member; the method is characterized in that a plurality of parts of the main bridge main span steel structure section spliced in sequence behind the first main bridge main span steel structure section are hoisted and spliced, and specifically comprises the following steps:

step three: sectional assembly lower bridge deck boards;

step eight: sectional assembling of the upper bridge deck;

step nine: and (5) sectional assembling the cantilever panel.

2. The main bridge main span steel structure section part assembly method based on the cantilever bridge girder erection machine, which is characterized in that the specific mode for ensuring that the first side lower chord and the second side lower chord are hoisted in place is as follows: the ends of the first side lower chord member and the second side lower chord member are connected by adopting a code plate, and the cantilever ends are adjusted by adopting a mechanical jack so as to ensure the positioning in the elevation direction; the transverse bridge directional positioning of the first side lower chord member and the second side lower chord member is realized by a transverse bridge directional moving system of the cantilever bridge girder erection machine; the forward positioning of the first and second side bottom chords is controlled by the lifting equipment of the cantilever bridge girder erection machine and the support of the main span steel structure section of the previous section of main bridge.

3. The method for assembling the main bridge main span steel structure section parts based on the cantilever bridge girder erection machine according to claim 1, wherein the temporary positioning operation of the first side upper chord and the second side upper chord specifically comprises the following steps: temporary positioning is achieved between the temporary connecting code plates and the corresponding side adjusting web members, then temporary supporting frames are used for supporting the temporary connecting code plates between the corresponding side upper chords and the corresponding side lower chords, and 12-16 mm girth welds are adopted at the end portions to be spliced with the upper chords of the main span steel structure sections of the previous main bridge.

4. The main bridge main span steel structure section part assembly method based on the cantilever bridge girder erection machine according to claim 1, wherein the cantilever bridge girder erection machine comprises a supporting truss system, an advancing-anchoring system, a girder transporting system and a multidirectional transportation system; the advancing-anchoring system comprises a machine body advancing driving device and a machine body anchoring device, wherein the machine body advancing driving device is arranged at the bottom of an anchoring section of the support truss system, and the machine body anchoring device is arranged between the anchoring section of the support truss system and an upper bridge deck in a detachable connection mode; the girder transporting system is arranged on the upper bridge deck and is positioned in an area surrounded by a bottom truss of the supporting truss system; the multi-directional transportation system is arranged on a middle truss of the supporting truss system and comprises hoisting equipment, a forward-bridge-direction track beam, a transverse-bridge-direction track system and a transverse-bridge-direction moving system; the hoisting equipment is movably arranged on the forward bridge track beam; the forward-bridge track beams are arranged along the forward bridge direction of the main bridge steel structure and comprise anchoring section track beams and cantilever section track beams, and temporary connection structures capable of realizing splicing/separating of the anchoring section track beams and the cantilever section track beams; the anchoring section track beam is arranged in an anchoring area of the support truss system and is fixedly connected with a cross beam of the anchoring area of the support truss system; the cantilever section track beam is arranged in a cantilever area of the support truss system, is movably arranged on a transverse connecting beam of the cantilever area of the support truss system through a transverse bridge to the track system, and is connected with a power output end of the transverse bridge to the moving system; the cantilever rail beam is movable along the bridge to the rail system by the power of the bridge to the moving system in a state of being separated from the anchor rail Liang Jie.

5. The method for assembling the steel structural section parts of the main bridge span based on the cantilever bridge girder erection machine, according to claim 4, wherein the steel structural section parts are transferred to a bridge deck transportation crane through a portal crane or a crawler crane, the bridge deck transportation crane is self-transported from the side span to a girder transporting system of the cantilever bridge girder erection machine and is transported by the girder transporting system to a loading area of a multi-directional transportation system, the multi-directional transportation system is self-transported from the loading area to a splicing site for unloading, and the multi-directional transportation system comprises the following specific implementation steps:

6. The method for assembling the main bridge main span steel structure section parts based on the cantilever bridge girder erection machine, which is characterized in that after the main bridge main span steel structure section parts of the previous section are assembled, the cantilever bridge girder erection machine is shifted through an advancing-anchoring system; in the advancing-anchoring system, 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;

7. The main bridge main span steel structure section part assembly method based on the cantilever bridge girder erection machine, which is characterized in that the supporting truss system is assembled on site by adopting a plurality of factory-prefabricated modularized components; the method comprises the following steps of:

step 3.2, installing a movable front strut module on site;

step 3.3, the front pivot point is mounted on site in parallel;

step 3.4, installing a movable rear support rod module on site;

step 3.5, the pivot is connected in parallel after field installation;

step 3.6, installing a lower connecting chord on site;

8. The main bridge main span steel structure section part assembly method based on the cantilever bridge girder erection machine as claimed in claim 1, wherein the part hoisting and assembly method of the first main bridge main span steel structure section comprises the following steps: