CN106087768B - A kind of method of the assembled mobile formwork in the narrow short transition time section of bridge tunnel - Google Patents

A kind of method of the assembled mobile formwork in the narrow short transition time section of bridge tunnel Download PDF

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Publication number
CN106087768B
CN106087768B CN201610661827.6A CN201610661827A CN106087768B CN 106087768 B CN106087768 B CN 106087768B CN 201610661827 A CN201610661827 A CN 201610661827A CN 106087768 B CN106087768 B CN 106087768B
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China
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girders
girder
nose
front leg
leg strut
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CN106087768A (en
Inventor
李红斌
周烽
尹育文
谌荣华
李祖勇
黄文俊
苏良平
李伟清
曹智波
匡旭
苗林峰
黄敏
杨磊
张正刚
张琴
康晖
何智超
仇建坤
刘汉华
熊宾松
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NO 3 ENGINEERING Co Ltd ZHONGTIE 25 BUREAU GROUP
China Railway 25th Bureau Group Co Ltd
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NO 3 ENGINEERING Co Ltd ZHONGTIE 25 BUREAU GROUP
China Railway 25th Bureau Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention discloses a kind of method of the assembled mobile formwork in the narrow short transition time section of bridge tunnel, in girder bottom welded and installed track advancing;In basement transition stage segmented assembly girder and connection system, by running gear drive device after reverse operating, along track advancing, assembled one section retreats one section, until all connection, assembly finish girder;After girder assembly, i.e., pushing tow mobile formwork is run forward running gear drive device forward after positive operation, and the installation for completing front leg strut on bridge pier after nose girder via is fixed;After front leg strut installation is fixed, continue after positive operation running gear drive device pushing tow mobile formwork girder via forward;During girder via, often move 4m and complete triangle outrigger and plug-in assembly one by one, until being fully completed triangle outrigger and plug-in assembly;After girder via, fixed rear support leg, middle supporting leg and front leg strut are installed on 0# platforms, 1# piers, 2# piers respectively, complete mobile formwork via task.

Description

A kind of method of the assembled mobile formwork in the narrow short transition time section of bridge tunnel
Technical field
The present invention relates to a kind of method of assembled mobile formwork, the assembly in the narrow short transition time section of bridge tunnel more particularly to one kind The method of mobile formwork.
Background technology
The up self-propelled moveable formwork of DSZ32/900 types is constructed and designed for special line for passenger trains double-line full span box, Mould bases is placed in bridge floor top structure using girder, and supporting leg is installed using beam-ends, bridge pier, can voluntarily upside-down mounting supporting leg, have good Stability.Mould bases is mainly by girder system, plug-in, transverse-moving mechanism and locking mechanism, outer modular system, rear running mechanism, rear branch The part group such as leg, middle supporting leg, front leg strut, suspension rod, lifting dolly, overhead traveling crane and 5t electric hoists, electric hydraulic system and auxiliary equipment Into, wherein:Girder divides 1# girders, 2# girders, three sections of 3# girders, wherein:1# girders 12.9m, 2# girder, 3# girders are respectively 12.0m;Nose girder divides 1# nose girders 6,2# nose girders 7,8 three sections of 3# nose girders, length difference 11.0m;Total length reaches 69.9m.It is plug-in including 1# is plug-in, 2# is plug-in, 3# is plug-in, 4# is plug-in, 5# is plug-in, 6# is plug-in, 7# is plug-in and 8# is plug-in.
The common assembling method of mobile formwork has two kinds, and one kind is that roadbed is assembled after utilizing platform, and another kind is in beam position processed It is assembled.
1st, roadbed assembly generally makees assembled place in the roadbed of abutment platform tail one section of basic forming of selection after platform, and assembly is substantially It is divided into two stages, stage one:Mould bases completes main couple on roadbed and supporting leg installation, mould bases move forward to beam position processed;Stage two: Mould bases is assembled and debugs mould bases hydraulic pressure and electrification systems in assembly outrigger in beam position processed, plug-in, external mold.Because mould bases is longitudinally long 69.9 meters, horizontal main couple is wide 7.6 meters, to meet that mould bases is put and crane operation space, roadbed assembly place length are no less than 70m, width are no less than 20m.
2nd, mobile formwork beam position is assembled basically identical with roadbed assembly principle after platform, and mould bases is faced by being set up in beam position processed When buttress, using crane assembled main couple and supporting leg paragraph by paragraph, after mould bases is assembled into from steady system, remove temporary rest pier, lifting Plug-in and template, while hydra-electric system is installed.Because mould bases main couple single-unit weight most weighs 33 tons, to meet large-scale hang Equipment availability is filled, from safety and cost consideration, the assembling method applies in general to the first high shorter place of and pier open flat across landform.
Very narrow for construction site, DSZ32-900 mobile formwork body total lengths reach 69.9m, be 13.18m's 69.9m mobile formwork is assembled on roadbed, there are no such Project case, when just carrying out construction investigation, is engaged in shifting for many years The brainstrust of dynamic model frame erecting beam construction is all stymied by.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of it is simple to operate, safe and reliable, cost is low narrow in bridge tunnel The method of assembled mobile formwork in short transition time section.
In order to solve the above-mentioned technical problem, the side of the assembled mobile formwork provided by the invention in the narrow short transition time section of bridge tunnel Method, it is characterized in that:It is identical with the existing guide rail of nose girder in girder bottom welded and installed track advancing, its position, physical dimension; Basement transition stage segmented assembly girder and connection system, it is assembled along track advancing by running mechanism drive device after reverse operating One section retreats one section, and the assembly of next section is carried out with assembled place of soaring, until all connection, assembly finish girder;It is main After beam assembly, i.e., pushing tow mobile formwork is run forward running mechanism drive device forward after positive operation, in nose girder via The installation that front leg strut is completed on bridge pier afterwards is fixed;After front leg strut installation is fixed, running mechanism drives after continuing positive operation Device pushing tow mobile formwork girder via forward;During girder via, often move 3.8m~4.2m and complete triangle one by one and choose Beam and plug-in assembly, until being fully completed triangle outrigger and plug-in assembly;After girder via, respectively in 0# platforms, 1# Fixed rear support leg, middle supporting leg and front leg strut are installed on pier, 2# piers, complete mobile formwork via task.
The specific step of the present invention is poly- as follows:
(1) site planning
In narrow construction area, divided according to function, Liang Ge cranes area, 1 haulage vehicle park and 1 assembly Area, each region roadbed leveling compacting;
Build-up area is main implementation region, and before mobile formwork installation is in place, concrete hardening is used to build-up area surface Processing, its absolute altitude are maintained in a gradient with abutment top surface, tunnel inverted arch face;
(2) temporary rest pier is set up
Temporary rest pier is set up using four steel pipe supports, according to the forward and backward height of landing leg of mobile formwork, scaffolding height choosing 1.9m is selected as, is coupled between adjacent steel pipe support using channel-section steel bridging and horizontal brace, both sides bracing members plan vertical girder direction Lay Two bors d's oeuveres I-steel;
(3) bridge tunnel changeover portion mobile formwork assembly step and method
Installation and the track advancing welding in place of the first step, 1# girders
1. the installation of first paragraph girder is in place very crucial:1# girders 1 initially lift on-station position and go deep into 5m in tunnel;
2. setting up the first temporary rest pier and the second temporary rest pier, in order to increase track advancing weld length, use up 1# girders Amount backward more moves back a bit, and being that 2# girders as far as possible in place more provides fabricating yard, the side work by the second temporary rest pier close to tunnel Word gooseneck is cancelled, and is changed at the top of arranged on left and right sides steel pipe post respectively install an oil overhold, on the one hand increases track advancing welding Length, on the other hand after the completion of 1# girder assembly, lifted with rear support leg cooperation, the 1# girders after assembly are uniformly fallen In the groove for entering the travelling wheel of the upper framework of front leg strut;
3. using crane by 1# girders it is left and right be installed in place and middle extension bar part and binder installation after, along 1# girders bottom Track advancing is welded corresponding to the position of nose girder guide rail, first paragraph track advancing weld length is 7m;
4. using crane installation rear walking mechanism and rear support leg, and laying retreats rail in tunnel, as rear traveling Mechanism retreats the track of traveling;The upper framework of front leg strut is mounted and fixed at tunnel face, strictly presses track advancing spacing control Make the upper framework spacing of left and right front leg strut, it is ensured that the upper framework of front leg strut is fully engaged between track advancing, utilizes front leg strut Via principle, the spelling of mobile formwork is realized by relative displacement of the track advancing of Main Girder Welding on the upper framework of front leg strut Dress retreats, and the upper framework of front leg strut is fixed;
Second step, 1# girders are given up the throne
1. by operating the oil overhold synchronization lifting on rear support leg and the second temporary rest pier, the first temporary rest pier is removed, it is ensured that The upper framework of running mechanism and front leg strut is fully fallen into track slot respectively afterwards, then removes the second temporary rest pier, through checking computations, is propped up in the past The upper framework of leg is fulcrum, and forward and backward girder is in poised state;
After 2. 1# girders fall beam, running mechanism drive device after reverse operating, traction 1# girders integrally retreat into tunnel Mobile, the upper framework of front leg strut remains stationary, before the upper framework front end of front leg strut is strictly monitored when mobile away from track advancing The relative position at end, track advancing close to front leg strut upper framework front position when, stop retreat operation;
3rd step, 2# girders are installed in place
Lift that 2# girders are in place, complete aligning, be assembled, being coupled for connection system between 1# girders, 2# girders and beam;
4th step, the welding of 2# girders track advancing
1. it is complete to the beam-ends of 2# girders 2, position, physical dimension and 1# girders to extend welding track advancing along 2# girder beams bottom It is identical;
2. running mechanism drive device after reverse operating, pass through relative position between the upper framework wheel shaft and track advancing of front leg strut Move, traction 1# girders, 2# girder connectors retreat into tunnel, until 2# girders front end and the upper framework front end pair of front leg strut Together, fallback procedures strengthen monitoring;
3. balance inspection is calculated:It disclosure satisfy that the requirement of balance;
Step 5: 3# girders are installed in place
Lift that 3# girders are in place, complete 2# girders, 3# girders dock, be assembled, being coupled and the peace of 3# girders connection binder Dress is in place;
Step 6: 3# girders track advancing connects guide rail
Extend welding track advancing along 3# girder beams bottom, and be connected with the existing guide rail in 3# girders front end, position, geometry Size is identical with the track advancing of 1# girders, 2# girders;
Step 7: 3# girders are given up the throne
1. running mechanism drive device after reverse operating, by relative between the wheel shaft and track advancing of the upper framework of front leg strut Displacement, traction 1# girders, 2# girders, 3# girder connectors retreat into tunnel, until track advancing and existing rail attachment point Alignd with the upper framework front end of front leg strut, fallback procedures strengthen monitoring;
2. after giving up the throne, supporting leg in being installed by mobile formwork;
Step 8: installation 1# nose girders
1. it is in place using crane lifting 1# nose girders, complete 3# girders, 1# nose girders dock, be assembled, being coupled and 1# nose girders connect It is in place to connect the installation for being;
2. running mechanism draws 1# girders, 2# girders, 3# girders and 1# nose girders connector along nose girder guide rail after reverse operating Moved into tunnel, until the upper framework front end of the front end of 1# nose girders 4 alignment front leg strut 8;
Step 9: installation 2# nose girders
1. lifting, 2# nose girders are in place, complete 1# nose girders, 2# nose girders dock, be assembled, being coupled and the peace of 2# nose girders connection system Dress is in place;
2. running mechanism traction 1# girders, 2# girders, 3# girders and 1# nose girders, 2# nose girders connector edge are led after reverse operating Beam guide rail retreats movement into tunnel, until the upper framework front end of 2# nose girders front end alignment front leg strut;
Step 10: installation 3# nose girders and overhead traveling crane
1. lifting, 3# nose girders are in place, complete 1# nose girders, 2# nose girders, 3# nose girders dock, be assembled, being coupled and the connection of 3# nose girders The installation of system is in place;
It is 2. in place using overhead traveling crane at the top of crane installation mobile formwork;
Step 11: the upper framework of front leg strut is preposition
1. put down the oil cylinder of rear support leg and middle supporting leg, by adjusting the lowering or hoisting gear of rear support leg and middle supporting leg, by it is assembled, The mobile formwork beam body connected jacks up upwards, the convenient upper framework lifting job for removing temporary rest pier and front leg strut;
2. removing the first temporary rest pier and the second temporary rest pier, the upper framework handling of front leg strut is moved forward with overhead traveling crane, is placed in Abutment is fixed at breastwork after adjusting spacing, while is adjusted laying and retreated rail;
The oil cylinder of supporting leg and rear support leg during 3. synchronous reduces, beam body front slideway uniformly fall into the upper framework of front leg strut Wheel axial trough in;Behind rear end the wheel shaft of running mechanism fall into retreat rail groove in, and the front and rear upper framework by front leg strut and Running mechanism bears beam body load afterwards, and the oil cylinder and rear support leg of middle supporting leg shrink vacantly;
Step 12: nose girder via
1. running mechanism after positive operation, pushing tow mobile formwork beam body moves forward along nose girder guide rail, starts nose girder via It is mobile, until middle supporting leg is moved at abutment breastwork, stop reach;
2. starting the oil cylinder hydraulic device of rear support leg and middle supporting leg, rear support leg and the landing of middle supporting leg are fixed, to bear to move Mould bases beam body whole load;
Step 13: installation front leg strut
After the lower framework that front leg strut is installed and fixed on bridge pier, arrived using the upper framework of overhead traveling crane handling front leg strut along nose girder On bridge pier, the connection with the lower framework of front leg strut, realize that the installation of front leg strut is in place, complete nose girder head holes via;
Step 14: girder via and plug-in installation
1. after adjustment after walking rails, the oil cylinder for shrinking rear support leg and middle supporting leg is in vacant state, and beam body load is by preceding Supporting leg and rear running mechanism undertake;
2. running mechanism after starting, thrust beam body moves forward, and girder starts via;
3. moving forward, specifically it is defined by live external position, when possessing the lifting plug-in conditions of 8#, before girder stops Move, start to lift that 8# is plug-in and triangle outrigger;
4. moving forward, when possessing the lifting plug-in conditions of 7#, girder stops reach, starts to lift that 7# is plug-in and triangle is chosen Beam;
5. moving forward, when possessing the lifting plug-in conditions of 6#, girder stops reach, starts to lift that 6# is plug-in and triangle is chosen Beam;According to said method, until completing all plug-in lifting operations;
Step 15: complete whole vias
Supporting leg installs and fixes in being completed on bridge pier, falls middle supporting leg and rear support leg, is respectively supported at bridge pier and abutment On, front leg strut is shunk, front leg strut handling to 2# bridge piers is installed using overhead traveling crane, be fixed, completes mobile formwork whole via task, Initially enter beam process processed.
It is using the method for assembled mobile formwork, its technical characterstic in the narrow short transition time section of bridge tunnel of above-mentioned technical proposal:
1st, possessing lifting and under depositing beam, traffic condition, by adjust welding section length, mobile front leg strut upper framework and Track advancing sequencing etc. is welded, the present invention can be applied to any length movement mould of the bridge tunnel transition length more than 3.0m Frame is assembled;
2nd, the present invention is suitable for mobile formwork retrogressing consolidation service in straight tunnel, for curved tunnel, should pass through measurement Determine whether curved section possesses the condition of mobile formwork straight line retrogressing;
3rd, successful application of the invention, successfully solve asking for the assembled via in place of narrow bridge tunnel changeover portion mobile formwork Topic, has expanded the application of mobile formwork, the organization arrangement to be set a roof beam in place in complicated topographical conditions section of railway track system, which provides, to borrow Mirror, is adapted to the construction that works to tight deadlines that mountain area system is set a roof beam in place very much;
4th, the present invention, which only relies on mobile formwork front leg strut upper framework and track advancing is set up on girder, solves movement Mould bases retreats the problem of traveling, simple to operate, securely and reliably, reduces equipment investment cost, has not only saved cost, is saving Effect is also fairly obvious in terms of emission reduction and environmental protection.
In summary, the present invention is a kind of simple to operate, safe and reliable, low assembly in the narrow short transition time section of bridge tunnel of cost The method of mobile formwork.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Fig. 2 is the structural representation of mobile formwork.
Fig. 3 is the site planning schematic diagram of the present invention.
Fig. 4 is the structural representation of the temporary rest pier of the present invention.
Fig. 5 is 1# girders installation and track advancing welding schematic diagram in place.
Fig. 6 is girder and track advancing welding schematic diagram.
Fig. 7 is that 1# girders are given up the throne schematic diagram.
Fig. 8 is 2# girders scheme of installation in place.
Fig. 9 is 2# girders track advancing welding schematic diagram.
Figure 10 is 3# girders scheme of installation in place.
Figure 11 is 3# girders track advancing connection guide rail schematic diagram.
Figure 12 is that 3# girders are given up the throne schematic diagram.
Figure 13 is installation 1# nose girder schematic diagrames.
Figure 14 is installation 2# nose girder schematic diagrames.
Figure 15 is installation 3# nose girders and overhead traveling crane schematic diagram.
Figure 16 is the preposition schematic diagram of upper framework of front leg strut.
Figure 17 is nose girder via schematic diagram.
Figure 18 is installation front leg strut schematic diagram.
Figure 19 is girder via and plug-in installation first step schematic diagram.
Figure 20 is girder via and plug-in installation second step schematic diagram.
Figure 21 is girder via and plug-in installation schematic diagram.
Figure 22 is to complete whole via schematic diagrames.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Bridge Pier abutment body average pier height in dam has exceeded 54.3m under the railway of cloud osmanthus, is required according to Design of Construction Organization and scheme, under Dam bridge uses the cast-in-place beam processed of DSZ32-900 mobile formworks.
Changeover portion roadbed only 7.46m between the small mileage direction bridge tunnel of lower dam bridge, abutment length 5.72m, road platform combined length 13.18m;Changeover portion (containing abutment) is less than 10m between the bridge tunnel of big mileage direction.Therefore beam scheme processed from childhood mileage direction to big mileage side To progress, i.e. mobile formwork assembly place election is located in lower dam bridge and the narrow short transition time section in tunnel.Due to construction site very Narrow, DSZ32-900 mobile formwork body total lengths reach 69.9m, and 69.9m mobile mould is assembled on 13.18m roadbed Frame, such Project case is there are no, when just carrying out construction investigation, be engaged in the brainstrust of mobile formwork erecting beam construction for many years all It is stymied by.
By investigating repeatedly job site, to tunnel physical dimension and and mobile formwork fuselage physical dimension progress Compare repeatedly, creative proposing carries out the method for assembled mobile formwork in bridge tunnel narrow transition section, and succeeds and answer With.
Referring to Fig. 2, the up self-propelled moveable formwork of DSZ32/900 types is constructed for special line for passenger trains double-line full span box And design, mould bases is placed in bridge floor top structure using girder, and supporting leg is installed using beam-ends, bridge pier, can voluntarily upside-down mounting supporting leg, tool There is good stability.Mobile formwork is mainly by girder system, plug-in, transverse-moving mechanism and locking mechanism, outer modular system, rear traveling Mechanism 19, rear support leg 18, middle supporting leg 9, front leg strut 8, suspension rod, electric hoist, the electric hydraulic system for lifting by crane dolly, overhead traveling crane 7 and 5t And the part such as auxiliary equipment forms, wherein:Girder system divides 3 three sections of 1# girders 1,2# girders 2 and 3# girders, wherein:1# girders 1 Long 12.9m, 2# girders and 3# girders are respectively 12.0m;Nose girder divides 6 three sections of 1# nose girders 4,2# nose girders 5 and 3# nose girders, length point Other 11.0m;Total length reaches 69.9m.It is plug-in including 1# is plug-in 10,2# is plug-in 11,3# is plug-in 12,4# is plug-in 13,5# is plug-in 14,6# Plug-in 15,7# plug-in 16 and 8# plug-in 17.
Lower dam bridge is between two tunnels, and changeover portion is 13.18m (containing abutment) between small mileage direction bridge tunnel;Big mileage Changeover portion is less than 10m between the bridge tunnel of direction.Erection for bridge between tunnel, typically use support cast-in-place method or prefabricated in beam field After treat tunnel holing through using Bridge Erector set up the methods of carry out bridge erection.Lower dam bridge pier body height is more than 50 meters, up to To 70 meters, and cloud osmanthus railway is high mountains and precipitous paths, and tunnel can not penetrate in advance, is required according to owner's Design of Construction Organization, lower dam bridge Using mobile formwork cast-in-place construction.To realize that mobile formwork beam is constructed in the extremely narrow lower dam bridge of execution conditions, first Will solve assembled problem of the mobile formwork in 13.18 meters of bridge tunnel changeover portions.
Through live factual survey and measure, mobile formwork top width 7.6m, the tunnel clear span with mobile formwork top corresponding height The 2.253m 12.106m both sides are had more than needed;Mobile formwork height (containing track) 4.9m, the vertical corresponding tunnel clear height of two sides 7.952m, height of having more than needed 3.052m;By comparative analysis, possesses the condition for accommodating mobile formwork in tunnel, but do not possess assembly Condition;
Changeover portion adds the length of abutment between the small mileage direction bridge tunnel of lower dam bridge, and total length is 13.18 meters, and both sides are shallow It cutting, can suitably widen, possess the condition of crane operation, roadbed section can possess the assembled condition of mobile formwork;
It is 12m (1# girders section 12.9m) that mobile formwork girder, which often saves length, and 13.18 meters of place only possesses one between bridge tunnel The assembled condition of section girder.
According to the structure type of mobile formwork, and the condition that scene is actual, it is determined that moved in the narrow short roadbed transition section of bridge tunnel Dynamic model frame assembling technique scheme:The welded and installed track advancing 20 in girder bottom, its position, physical dimension and nose girder is existing leads Rail 21 is identical;In basement transition stage segmented assembly girder and connection system, pass through the drive device of running mechanism after reverse operating 19, edge Assembled one section of track advancing 20 retreats one section, and the assembly of next section is carried out with assembled place of soaring, until girder all connects Connect, assembly finishes;After girder assembly, i.e., pushing tow mobile formwork is forward forward for the drive device of running mechanism 19 after positive operation Operation, the installation for completing front leg strut 8 on bridge pier after nose girder via are fixed;After the installation of front leg strut 8 is fixed, continue positive behaviour The drive device of running mechanism 19 pushing tow mobile formwork girder via forward after work;During girder via, 4m~4m is often moved Triangle outrigger and plug-in assembly are completed one by one, until being fully completed triangle outrigger and plug-in assembly;After girder via, Fixed rear support leg 18, middle supporting leg 9 and front leg strut 8 are installed on 0# platforms, 1# piers, 2# piers respectively, complete mobile formwork via task.
Analyzed more than, to solve the problems, such as that the bridge tunnel changeover portion in 13m completes 70m mobile formwork assembly, is exactly first Solves the problems, such as mobile formwork retrogressing.
Mobile formwork nose girder why can via, be exactly that a pair of guide rails 22 is mounted with below nose girder, between the inner side of guide rail 22 Away from 4.42m, guide rail 22 is placed on the travelling wheel of the upper framework of front leg strut 8, using rolling of the guide rail 22 on travelling wheel, so as to real Existing nose girder via.
Solve the problems, such as girder retrogressing, be exactly using the principle of nose girder via, one section and nose girder are welded in girder bottom The identical track advancing 20 of the positions and dimensions of guide rail 21, passes through traveling of the track advancing 20 on the upper framework of front leg strut 8 Wheel and walking of the rear walking mechanism 9 on rail, realize the assembled purpose retreated of girder beam body.
Due to assembled narrow space, track advancing 20 can not possibly once weld connection, it is necessary at the construction field (site) according to movement Mould bases assembly actual conditions " segmented welding, one section of welding retreat one section, progressively connected with the guide rail 21 of nose girder ", specifically refer to and apply Work technological process is elaborated (it is worth noting that, the technology, during popularization and application, the segmentation of track advancing 20 is welded Spreading degree and transition section length have much relations, weldering connection long guideway 20 how are segmented in popularization and application, as the case may be Analysis).Described in conjunction with 13.18m transition section lengths.
Referring to Fig. 1, the method for the assembled mobile formwork of the invention in the narrow short transition time section of bridge tunnel, specifically step is as follows for it:
(1) site planning
Referring to Fig. 3, in narrow construction area, divided according to function, Liang Ge cranes area, 1 haulage vehicle park And 1 build-up area, each region roadbed leveling compacting;
Build-up area is that this achievement mainly implements region, and before mobile formwork installation is in place, coagulation is used to build-up area surface Native cure process, its absolute altitude are maintained in a gradient with abutment top surface, tunnel inverted arch face;
(2) temporary rest pier is set up
Referring to Fig. 4, temporary rest pier 23 is set up using four steel pipe supports, according to the forward and backward height of landing leg of mobile formwork, Scaffolding height selection is 1.9m, and [10 channel-section steel bridgings and horizontal brace connection, both sides bracing members top are used between adjacent steel pipe support Vertical girder direction laying Two bors d's oeuveres 20a I-steel;
(3) bridge tunnel changeover portion mobile formwork assembly step and method
Installation and the track advancing welding in place of the first step, 1# girders
1. the installation of first paragraph girder is in place very crucial:It is too near by abutment 25, when increase girder backway, second, To pass through repeatedly retrogressing could give 2# girders 2 enough assembled length;Going deep into tunnel 22 can not be too deep, does not possess in tunnel 22 and hangs Dress condition, all lifting operations can only be completed outside tunnel 22.Therefore, verified repeatedly by scene, 1# girders 1 initially lift just 5m in tunnel 22 is goed deep into position position.
2. setting up the first temporary rest pier 231 and the second temporary rest pier 232, in order to increase the weld length of track advancing 20, make 1# girders 1 move back a little more backward as far as possible, are the as far as possible more offer fabricating yards in place of 2# girders 2, and the second temporary rest pier 232 is close The side I-shaped gooseneck in tunnel 22 is cancelled, and is changed at the top of arranged on left and right sides steel pipe post respectively install an oil overhold 233:One side Face increases the weld length of track advancing 20, can be with the cooperation liter of rear support leg 17 on the other hand after the completion of the assembly of 1# girders 1 Drop, in the groove for the travelling wheel that the 1# girders 1 after assembly are uniformly fallen into the upper framework of front leg strut 8;
3. using crane by 1# girders 1 it is left and right be installed in place and middle extension bar part and binder installation after, along the bottom of 1# girders 1 Portion is corresponding to the position welding track advancing 20 of nose girder guide rail 21, and the weld length of first paragraph track advancing 20 is 7m, as Fig. 5 is marked It is shown, specific size such as Fig. 6 of welding;
4. using crane installation rear walking mechanism 19 and rear support leg 18, and laying retreats rail 26 in tunnel 22, make The track of traveling is retreated for rear running mechanism 19;The upper framework of front leg strut 8 is mounted and fixed at 22 mouthfuls of tunnel (such as Fig. 5 institutes Show), the strict upper framework spacing that left and right front leg strut 8 is controlled by the spacing of track advancing 20, it is ensured that " upper framework of front leg strut 8 " With " be fully engaged between track advancing 20 ", using the via principle of front leg strut 8, by Main Girder Welding " track advancing 20 " is " preceding Relative displacement on the upper framework of supporting leg 8 " realizes that the assembled of mobile formwork retreats (upper framework of front leg strut 8 is fixed).
Second step, 1# girders are given up the throne
1. by operating the synchronization lifting of oil overhold 233 on the temporary rest pier 232 of rear support leg 1 and second, remove first and prop up temporarily Pier 231, it is ensured that the upper framework of rear running mechanism 19 and front leg strut 8 is fully fallen into track slot respectively, then removes the second temporary rest pier 232, through checking computations, using the upper framework of front leg strut 8 as fulcrum, forward and backward girder is in poised state;
After 2. 1# girders 1 fall beam, the drive device of running mechanism 19 after reverse operating, it is overall to tunnel 22 to draw 1# girders 1 It is interior to retreat mobile (upper framework of front leg strut 8 remains stationary), the upper framework front end of front leg strut 8 is strictly monitored when mobile away from connecing The relative position of the long front end of track 20, track advancing 20 close to front leg strut 8 upper framework front position when, stop retreat operation; Referring to Fig. 7.
3rd step, 2# girders are installed in place
As shown in figure 8, using crane " cantilever technology ", lifting 2# girders 2 are in place, complete 1# girders 1,2# girders 2 and beam Between connection system align, be assembled, be coupled.
4th step, the welding of 2# girders track advancing
1. extend welding track advancing 20 to the beam-ends of 2# girders 2 (position, physical dimension and 1# girders 1 along the beam bottom of 2# girders 2 It is identical);
2. the drive device of running mechanism 19 after reverse operating, by between the upper framework wheel shaft and track advancing 20 of front leg strut 8 Relative displacement, traction 1# girders 1, the connector of 2# girders 2 retreat into tunnel 22, until the front end of 2# girders 2 and front leg strut 8 is upper Framework front end is alignd, and fallback procedures strengthen monitoring;
3. balance inspection is calculated:Calculated by inspection, resultant couple 143Mpa on the right side of the resultant couple 349Mpa > of left side, disclosure satisfy that before retreating The requirement of balance is (wherein:Running mechanism 19 is 16t afterwards, and rear support leg 18 is 2t, and 1# girders 1 are 22t, and 2# girders 2 are 17t).Ginseng See Fig. 9.
Step 5: 3# girders are installed in place
Referring to Figure 10, using crane " cantilever technology ", lifting 3# girders 3 are in place, complete 2# girders 2, pair of 3# girders 3 Connect, be assembled, being coupled and the installation of the connection binder of 3# girders 3 is in place.
Step 6: 3# girders track advancing connects guide rail
Referring to Figure 11, extend welding track advancing 20 along the beam bottom of 3# girders 3, and with the existing guide rail 21 in the front end of 3# girders 3 It is connected (position, physical dimension are identical with the track advancing 20 of 1# girders 1,2# girders 2);
Step 7: 3# girders are given up the throne
1. the drive device of running mechanism 19 after reverse operating, pass through the wheel shaft and track advancing 20 of the upper framework of front leg strut 8 Between relative displacement, traction 1# girders 1,2# girders 2, the connector of 3# girders 3 retreat into tunnel 22, until track advancing 20 with it is existing There is the junction of guide rail 21 to be alignd with the upper framework front end of front leg strut 8, fallback procedures strengthen monitoring;
2. after giving up the throne, supporting leg 9 in being installed by mobile formwork.Referring to Figure 12.
Step 8: installation 1# nose girders
1. crane " cantilever technology " is applied, it is in place using crane lifting 1# nose girders 4, complete 3# girders 3, pair of 1# nose girders 4 Connect, be assembled, being coupled and the installation of the connection of 1# nose girders 4 system is in place;
2. running mechanism 19 draws 1# girders 1,2# girders 2,3# girders 3 and the connector of 1# nose girders 4 edge and led after reverse operating Beam guide rail moves into tunnel 22, until the upper framework front end of the front end of 1# nose girders 4 alignment front leg strut 8.Referring to Figure 13.
Step 9: installation 2# nose girders
1. applying crane " cantilever technology ", lifting 2# nose girders 5 are in place, complete 1# nose girders 4, the docking, be assembled of 2# nose girders 5, It is coupled and the installation of the connection of 2# nose girders 5 system is in place;
2. running mechanism 19 draws 1# girders 1,2# girders 2,3# girders 3 and 1# nose girders 4,2# nose girders 5 and connected after reverse operating Junctor is retreated into tunnel 22 along nose girder guide rail and moved, until the upper framework front end of the front end of 2# nose girders 5 alignment front leg strut 8.Referring to Figure 14.
Step 10: installation 3# nose girders and overhead traveling crane
1. applying crane " cantilever technology ", lifting 3# nose girders 6 are in place, complete 1# nose girders 4,2# nose girders 5, pair of 3# nose girders 6 Connect, be assembled, being coupled and the installation of the connection of 3# nose girders 6 system is in place;
It is 2. in place using overhead traveling crane 7 at the top of crane installation mobile formwork.Referring to Figure 15.
Step 11: the upper framework of front leg strut is preposition
1. the oil cylinder of rear support leg 18 and middle supporting leg 9 is put down, will by adjusting the lowering or hoisting gear of rear support leg 18 and middle supporting leg 9 Mobile formwork beam body that is assembled, connecting jacks up upwards, the convenient upper framework handling work for removing temporary rest pier and front leg strut 8 Industry;
2. the first temporary rest pier 231 and the second temporary rest pier 232 are removed, with overhead traveling crane 7 by before the upper framework handling of front leg strut 8 Move, be placed in abutment 25 at breastwork, fixed after adjusting spacing, while adjust laying and retreat rail 26;
The oil cylinder of supporting leg 9 and rear support leg 18 during 3. synchronous reduces, beam body front slideway uniformly fall into the upper of front leg strut 8 In the wheel axial trough of framework;Behind rear end the wheel shaft of running mechanism 19 is fallen into the groove for retreating rail 26, and front and rear by front leg strut 8 Upper framework and rear running mechanism 19 bear beam body load, and the oil cylinder and rear support leg 18 of middle supporting leg 9 shrink vacantly.Referring to Figure 16.
Step 12: nose girder via
1. running mechanism 19 after positive operation, pushing tow mobile formwork beam body moves forward along nose girder guide rail, starts nose girder mistake Hole is moved, until middle supporting leg 9 is moved at the breastwork of abutment 25, stops reach;Referring to Figure 17;
2. starting the oil cylinder hydraulic device of rear support leg 18 and middle supporting leg 9, rear support leg 18 and the landing of middle supporting leg 9 are fixed, to hold By mobile formwork beam body whole load;
Step 13: installation front leg strut
Referring to Figure 18, after the lower framework that front leg strut 8 is installed and fixed on bridge pier 27, using the handling front leg strut 8 of overhead traveling crane 7 Upper framework the connection with the lower framework of front leg strut 8, realizes that the installation of front leg strut 8 is in place along nose girder to bridge pier 27, completes nose girder First hole via;
Step 14: girder via and plug-in installation
Referring to Figure 19, Figure 20 and Figure 21:
1. after adjustment after walking rails, the oil cylinder for shrinking rear support leg 18 and middle supporting leg 9 is in vacant state, beam body load by Front leg strut 8 and rear running mechanism 19 undertake;
2. running mechanism 19 after starting, thrust beam body moves forward, and girder starts via;
3. 4~5m (being specifically defined by live external position) is moved forward, when possessing lifting plug-in 10 conditions of 8#, girder Stop reach, start to lift 8# plug-in 10 and triangle outrigger;
4. moving forward 4m, when possessing lifting plug-in 11 conditions of 7#, girder stops reach, start to lift 7# plug-in 11 and Triangle outrigger;
5. moving forward 4m, when possessing lifting plug-in 12 conditions of 6#, girder stops reach, start to lift 6# plug-in 12 and Triangle outrigger;According to said method, until completing all plug-in lifting operations;
Step 15: complete whole vias
Referring to Figure 22, supporting leg 9 installs and fixes in being completed on bridge pier, falls middle supporting leg 9 and rear support leg 18, supports respectively On bridge pier 27 and abutment 25, front leg strut 8 is shunk, the handling of front leg strut 8 is installed to 2# bridge piers 28 using overhead traveling crane 7, be fixed, is completed Mobile formwork whole via task, initially enters beam process processed.

Claims (1)

1. a kind of method of the assembled mobile formwork in the narrow short transition time section of bridge tunnel, it is characterized in that:In girder bottom, welded and installed connects Long track, its position, physical dimension are identical with the existing guide rail of nose girder;It is in basement transition stage segmented assembly girder and connection, By running mechanism drive device after reverse operating, along track advancing, assembled one section retreats one section, and to soar, assembled place is entered The assembly of the next section of row, until all connection, assembly finish girder;After girder assembly, i.e., traveling machine after positive operation Pushing tow mobile formwork is run forward structure drive device forward, and the installation for completing front leg strut on bridge pier after nose girder via is consolidated It is fixed;After front leg strut installation is fixed, continue after positive operation running mechanism drive device pushing tow mobile formwork girder via forward; During girder via, often move 3.8m~4.2m and complete triangle outrigger and plug-in assembly one by one, until being fully completed triangle Outrigger and plug-in assembly;After girder via, installed respectively on 0# platforms, 1# piers, 2# piers fixed rear support leg, middle supporting leg and Front leg strut, completes mobile formwork via task, and specific step is poly- as follows:
(1) site planning
In narrow construction area, divided according to function, Liang Ge cranes area, 1 haulage vehicle park and 1 build-up area, Each region roadbed leveling compacting;
Build-up area is main implementation region, and before mobile formwork installation is in place, build-up area surface is handled using concrete hardening, Its absolute altitude is maintained in a gradient with abutment top surface, tunnel inverted arch face;
(2) temporary rest pier is set up
Temporary rest pier is set up using four steel pipe supports, and according to the forward and backward height of landing leg of mobile formwork, scaffolding height selection is 1.9m, it is coupled using channel-section steel bridging and horizontal brace between adjacent steel pipe support, the laying of both sides bracing members plan vertical girder direction Two bors d's oeuveres I-steel;
(3) bridge tunnel changeover portion mobile formwork assembly step and method
Installation and the track advancing welding in place of the first step, 1# girders
1. the installation of first paragraph girder is in place very crucial:1# girders 1 initially lift on-station position and go deep into 5m in tunnel;
2. set up the first temporary rest pier and the second temporary rest pier, in order to increase track advancing weld length, make 1# girders as far as possible to Afterwards to move back a bit, being that 2# girders as far as possible in place more provides fabricating yard, the side I-steel by the second temporary rest pier close to tunnel more Crossbeam is cancelled, and is changed at the top of arranged on left and right sides steel pipe post respectively install an oil overhold, on the one hand increases track advancing welding length Degree, on the other hand after the completion of 1# girder assembly, lifted with rear support leg cooperation, the 1# girders after assembly are uniformly fallen into In the groove of the travelling wheel of the upper framework of front leg strut;
3. using crane by 1# girders it is left and right be installed in place and middle extension bar part and binder installation after, it is corresponding along 1# girders bottom Track advancing is welded in the position of nose girder guide rail, first paragraph track advancing weld length is 7m;
4. using crane installation rear walking mechanism and rear support leg, and laying retreats rail in tunnel, as rear running mechanism Retreat the track of traveling;The upper framework of front leg strut is mounted and fixed at tunnel face, strictly by the control of track advancing spacing it is left, The upper framework spacing of right front leg strut, it is ensured that the upper framework of front leg strut is fully engaged between track advancing, utilizes front leg strut via Principle, after relative displacement assembly to realize mobile formwork of the track advancing of Main Girder Welding on the upper framework of front leg strut Move back, the upper framework of front leg strut is fixed;
Second step, 1# girders are given up the throne
1. by operating the oil overhold synchronization lifting on rear support leg and the second temporary rest pier, remove the first temporary rest pier, it is ensured that after walk The upper framework of row mechanism and front leg strut is fully fallen into track slot respectively, then removes the second temporary rest pier, through checking computations, with front leg strut Upper framework is fulcrum, and forward and backward girder is in poised state;
After 2. 1# girders fall beam, running mechanism drive device after reverse operating, traction 1# girders are overall to retreat movement into tunnel, The upper framework of front leg strut is remained stationary, and phase of the upper framework front end of front leg strut away from track advancing front end is strictly monitored when mobile To position, track advancing close to front leg strut upper framework front position when, stop retreating operation;
3rd step, 2# girders are installed in place
Lift that 2# girders are in place, complete aligning, be assembled, being coupled for connection system between 1# girders, 2# girders and beam;
4th step, the welding of 2# girders track advancing
1. extend welding track advancing to the beam-ends of 2# girders 2, position, physical dimension and the complete phase of 1# girders along 2# girder beams bottom Together;
2. running mechanism drive device after reverse operating, by relative displacement between the upper framework wheel shaft and track advancing of front leg strut, Traction 1# girders, 2# girder connectors retreat into tunnel, until 2# girders front end is alignd with the upper framework front end of front leg strut, after Move back process and strengthen monitoring;
3. balance inspection is calculated:It disclosure satisfy that the requirement of balance;
Step 5: 3# girders are installed in place
Lift that 3# girders are in place, complete 2# girders, 3# girders dock, be assembled, being coupled and the installation of 3# girders connection binder just Position;
Step 6: 3# girders track advancing connects guide rail
Extend welding track advancing along 3# girder beams bottom, and be connected with the existing guide rail in 3# girders front end, position, physical dimension It is identical with the track advancing of 1# girders, 2# girders;
Step 7: 3# girders are given up the throne
1. running mechanism drive device after reverse operating, pass through relative position between the wheel shaft and track advancing of the upper framework of front leg strut Move, traction 1# girders, 2# girders, 3# girder connectors retreat into tunnel, until track advancing and existing rail attachment point with The upper framework front end alignment of front leg strut, fallback procedures strengthen monitoring;
2. after giving up the throne, supporting leg in being installed by mobile formwork;
Step 8: installation 1# nose girders
1. it is in place using crane lifting 1# nose girders, complete 3# girders, 1# nose girders dock, be assembled, being coupled and 1# nose girders connection system Installation it is in place;
2. running mechanism traction 1# girders, 2# girders, 3# girders and 1# nose girders connector are along nose girder guide rail to tunnel after reverse operating Moved in road, until the upper framework front end of the front end of 1# nose girders 4 alignment front leg strut 8;
Step 9: installation 2# nose girders
1. lifting, 2# nose girders are in place, complete 1# nose girders, 2# nose girders dock, be assembled, being coupled and the installation of 2# nose girders connection system just Position;
2. running mechanism traction 1# girders, 2# girders, 3# girders and 1# nose girders, 2# nose girder connectors are led along nose girder after reverse operating Rail retreats movement into tunnel, until the upper framework front end of 2# nose girders front end alignment front leg strut;
Step 10: installation 3# nose girders and overhead traveling crane
1. lifting, 3# nose girders are in place, complete 1# nose girders, 2# nose girders, 3# nose girders dock, be assembled, being coupled and 3# nose girders connection system Installation is in place;
It is 2. in place using overhead traveling crane at the top of crane installation mobile formwork;
Step 11: the upper framework of front leg strut is preposition
1. the oil cylinder of rear support leg and middle supporting leg is put down, by adjusting the lowering or hoisting gear of rear support leg and middle supporting leg, by assembled, connection Good mobile formwork beam body jacks up upwards, the convenient upper framework lifting job for removing temporary rest pier and front leg strut;
2. removing the first temporary rest pier and the second temporary rest pier, the upper framework handling of front leg strut is moved forward with overhead traveling crane, is placed in abutment At breastwork, fixed after adjusting spacing, while adjust laying and retreat rail;
The oil cylinder of supporting leg and rear support leg during 3. synchronous reduces, beam body front slideway uniformly fall into the wheel of the upper framework of front leg strut In axial trough;The wheel shaft of running mechanism is fallen into the groove for retreating rail behind rear end, and the front and rear upper framework by front leg strut is walked with after Beam body load bears in row mechanism, and the oil cylinder and rear support leg of middle supporting leg shrink vacantly;
Step 12: nose girder via
1. running mechanism after positive operation, pushing tow mobile formwork beam body moves forward along nose girder guide rail, starts the movement of nose girder via, Until middle supporting leg is moved at abutment breastwork, stop reach;
2. starting the oil cylinder hydraulic device of rear support leg and middle supporting leg, rear support leg and the landing of middle supporting leg are fixed, to bear mobile formwork Beam body whole load;
Step 13: installation front leg strut
After the lower framework that front leg strut is installed and fixed on bridge pier, using the upper framework of overhead traveling crane handling front leg strut along nose girder to bridge pier On, the connection with the lower framework of front leg strut, realize that the installation of front leg strut is in place, complete nose girder head holes via;
Step 14: girder via and plug-in installation
1. after adjustment after walking rails, the oil cylinder for shrinking rear support leg and middle supporting leg is in vacant state, and beam body load is by front leg strut Undertaken with rear running mechanism;
2. running mechanism after starting, thrust beam body moves forward, and girder starts via;
3. moving forward, specifically it is defined by live external position, when possessing the lifting plug-in conditions of 8#, girder stops reach, opens Beginning, 8# is plug-in and triangle outrigger for lifting;
4. moving forward, when possessing the lifting plug-in conditions of 7#, girder stops reach, starts to lift that 7# is plug-in and triangle outrigger;
5. moving forward, when possessing the lifting plug-in conditions of 6#, girder stops reach, starts to lift that 6# is plug-in and triangle outrigger; According to said method, until completing all plug-in lifting operations;
Step 15: complete whole vias
Supporting leg installs and fixes in being completed on bridge pier, falls middle supporting leg and rear support leg, is respectively supported on bridge pier and abutment, receives Contracting front leg strut, front leg strut handling to 2# bridge piers is installed using overhead traveling crane, be fixed, mobile formwork whole via task is completed, starts Into beam process processed.
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