CN103938557A - Overpass bridge dismounting method - Google Patents

Overpass bridge dismounting method Download PDF

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Publication number
CN103938557A
CN103938557A CN201410087126.7A CN201410087126A CN103938557A CN 103938557 A CN103938557 A CN 103938557A CN 201410087126 A CN201410087126 A CN 201410087126A CN 103938557 A CN103938557 A CN 103938557A
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China
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bridge
cut
lifting
steel
dismounting
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CN201410087126.7A
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CN103938557B (en
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卢耒运
秦兰芳
王振武
胡增国
刘海霞
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卢耒运
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Abstract

The invention discloses an overpass bridge dismounting method. A main overpass bridge deck system of a reinforced concrete combination overpass bridge is cut into three n-shaped beam units in the longitudinal direction, bridge surface separation is conducted under the condition that underbridge traffic is not closed, a bridge surface top board keeps a certain thickness and is not thoroughly cut when cut, it is avoided that cut-off reinforcing steel bars, concrete waste residues and cooling water fall onto a railway line and other business lines to affect normal operation of the railway line and the like in a cut process, residual unseparated layers of the bridge surface top board are cut with limited time according to the time replied by the railway department and other competent departments after preparatory work is ready, the bridge surface is clamped overall by using a hoisting tool, and the bridge surface which is clamped overall is separated in a hoisted mode by using a bridge girder erection machine suspension arm. Total construction time is shortened, the overall construction scheme is simple, rapid, convenient to implement, safe, reliable and high in operability, normal operation affected time of the railway line, a highway line and the other business lines is greatly shortened, and high timeliness and convenience are achieved.

Description

A kind of bridge crossing method for dismounting
Technical field
The invention belongs to railroad underbridge construction reformation technical field, be specifically related to a kind of bridge crossing method for dismounting.
Background technology
The seventies and eighties, China is solving in highway, railway usual friendship problem, due to the restriction of technical condition at that time, adopted in a large number steel concrete composite bridge structure carry out on highway across, due to the operation time limit is long and under national power at that time and the level of the productive forces design grade lower, there is no fully to predict the traffic pressure that more than 30 year high speed development of China brings, add remaining incessant after repeated prohibition of overload overrun vehicle, left huge potential safety hazard to the bridge crossing of building then.For the appearance of this problem, in conjunction with people-oriented, the state basic policy of safety first, highway in China bridge crossing certainly will will enter complete upgrading alteration stage.But, on existing railway line, especially carry out old bridge upgrading on wide, the Long Hai in capital, the railway main artery such as Beijing-Shanghai and even rebuild and need in the face of extremely strict condition restriction.First, driving do not construct, the construct guiding theory of not driving a vehicle has determined that the work such as dismounting reconstruction of bridge crossing not only will consider safety factor, and must consider time factor.Busy railway line can not as the such long-time close traffic of bridge construct, more difficult is also well-organized, carefully arrange, in the limited working time, can not have any operation that jeopardizes railway line safety.Busy railway line especially mainliner all to stop transport to removing the time that bridge construction gives way be very limited, often only have two, halfhour operable time at every turn, and be no more than weekly three, four times, difficulty of construction is well imagined.Therefore, other first quarter moon, being operated in of completing for 20 days need to be compressed to several days here and even in several hours, just must complete, therefore, explore a safety, fast, method for dismounting not only can be guaranteed construction safety, railway line security of operation easily, and can reduce withdrawal of train number of times and idle time, reduce construction investment, recessive social and economic benefits is difficult to the appraisal especially.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of bridge crossing method for dismounting, can effectively solve the problems such as existing poor in timeliness in present bridge crossing demolishing process, efficiency be low, realize rapid construction, greatly shortened the time that affects the normal operation of Rail Highway.
The present invention is for solving the problems of the technologies described above adopted technical scheme as described below:
A kind of bridge crossing method for dismounting, is characterized in that, comprises the following steps:
Step 1: bridge crossing cross-line main span bridge floor top board is longitudinally cut, form three Π section steel beam unit, retain first bridge floor bottom 5-6cm thickness and do not cut in the situation that not sealing under bridge traffic;
Step 2: to closing a road to traffic under the bridge of bridge crossing Demolition Construction position;
Step 3: the bridge floor cutting that bottom is reserved as to 5-6cm thickness is saturating;
Step 4: use lifting device by the girder steel clamping after cutting;
Step 5: use lifting device that the girder steel of integral retaining is hung.
Further, before bridge crossing cross-line main span bridge floor top board being cut in step 1, at bridge deck construction location, L-type protective baffle plate is installed, is removed anti-throwing net, guardrail, and protected apron and canvas cloth are installed.
Further, in step 3, by after bridge floor cutting thoroughly, remove protected apron, canvas cloth and open hoisting port.
Further, the structure of lifting device described in step 4 is: lifting appliance for bridge girder erection machine and bottom rail are lifted and longitudinally corresponding respectively on beam two groups of steel pin be set, and connect by wire rope between every group of steel pin,
Further, the method for using lifting device to hang girder steel in step 5 is clamping bridge floor to be placed on to lifting appliance for bridge girder erection machine, bottom rail lift in the space that beam and wire rope enclose, and uses Beam transportation vehicle to transport out of.
Further, in step 5, girder steel is hung and front Hoisting Position is reinforced, reinforcement means is for adopting two channel-section steels to carry out consolidation process to the upper and lower horizontal brace of existing bridging, diagonal brace, between cutting seam, by every 5m correspondence, one group of intermediate isolating anti-sticking steel plate is set, and coats butter on intermediate isolating steel plate.
Further, the method in step 5, girder steel being hung is for first lifting by crane central sill, rear lifting both sides side bar.
Further again, described bridge crossing refers to Combined concrete steel bridge.
Beneficial effect of the present invention is as follows: because the present invention adopts, steel concrete combination bridge crossing main span bridge deck is longitudinally cut into three Π section steel beam unit: in the situation that not sealing under bridge traffic, carry out bridge floor separation, when the cutting of bridge floor top board, reserved certain thickness is not cut, reinforcing bar while avoiding cutting, concrete waste residue and cooling water drop to the Business Lines such as railway affects the normal operations such as railway line, the ready rear inherent limited time of point according to authorities' replies such as railways of work to be prepared completes bridge floor top board and remains the not cutting of separating layer, use Bridge Erector arm that the bridge floor of integral retaining is hung.Protective baffle plate is installed needs the time to amount to 38 minutes; Remove the job execution time of protective screening, guardrail: (activity duration of 1 unit is 50 minutes) full-bridge needs 4 Comprehensive window points altogether; The discrete bridge deck engineering time share time 160 minutes.2 unit operations simultaneously, need 2 Comprehensive window points altogether; Remove protected apron, canvas cloth and open hoisting port engineering time total 115 minutes.Bridge Erector hangs tears 7 vertical skylight points of compound beam operation total needs open, and each 20 minutes engineering time, each some road closure time is 35 minutes; Business Line is stopped transport and is amounted to: 245 minutes, wherein hang and tear compound beam engineering time total open: 140 minutes.Integral construction scheme is simple and convenient, safe and reliable, workable, has greatly reduced the time that affects the normal operation of Rail Highway, has very high ageing and convenience.
brief description of the drawings
Fig. 1 is the flow chart of the method for the invention;
Fig. 2 is the existing profile of old bridge;
Fig. 3,4 is skylight opening and line of cut schematic diagram;
Fig. 5 is schematic diagram after cutting bridging installation protected apron;
Fig. 6 is protection complete removal, the discrete rear schematic diagram of bridge floor;
Fig. 7 is that schematic diagram is arranged in third and fourth " point " bridging position protection;
Fig. 8 is that third and fourth " point " arranges schematic diagram without the protection of bridging position;
Fig. 9,10 is for tearing beam suspender schematic diagram open;
Figure 11 is that strengthening of steel bridge is processed schematic diagram;
Figure 12,13 is Bridge Erector operation schematic diagram.
Description of reference numerals: 1 is railing, 2 is return wire, 3 is hoisting port, 4 is skylight opening, 5 is line of cut, 6 is warning line, 7 is beam slab cutting seam, 8 is central sill, 9 is anti-sticking steel plate, 10 is lifting appliance for bridge girder erection machine, 11 is beam body, 12 is wire rope, 13 is steel pin, 14 lift beam for bottom rail, 15 is No. 1 crown block sling, 16 is No. 2 crown block slings, 17 is contact net, 18 is branch-cut bridge, 19 is side bar, 21 is bamboo offset plate, 23 is plank, 24 is the lumps of wood, 25 is boring, 26 is Hoisting Position, 27 is longitudinal line of cut, 28 is channel-section steel, 29 is i iron, 30 is splash guard, 31 is angle steel.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
A kind of bridge crossing method for dismounting, comprises the following steps:
Step 1: bridge crossing cross-line main span bridge floor top board is longitudinally cut, form three Π section steel beam unit, retain first bridge floor bottom 5-6cm thickness and do not cut in the situation that not sealing under bridge traffic;
Step 2: to closing a road to traffic under the bridge of bridge crossing Demolition Construction position;
Step 3: the bridge floor cutting that bottom is reserved as to 5-6cm thickness is saturating;
Step 4: use lifting device by the girder steel clamping after cutting;
Step 5: use lifting device that the girder steel of integral retaining is hung.
As shown in Figure 1, before bridge crossing cross-line main span bridge floor top board being cut in step 1, at bridge deck construction location, L-type protective baffle plate (effect of L-type protective baffle plate is that while preventing that guardrail and the cutting of anti-throwing net from hanging, broken thing comes off) is installed, remove anti-throwing net, guardrail, and protected apron and canvas cloth are installed.
In step 3, by after bridge floor cutting thoroughly, remove protected apron, canvas cloth and open hoisting port 3.
As shown in Fig. 9,10, the structure of described lifting device is: lifting appliance for bridge girder erection machine 10 and bottom rail are lifted on beam 14 respectively and longitudinally corresponding two groups of steel pin 13 to be set, and connect by wire rope 12 between every group of steel pin, the method that lifting device hangs girder steel is the girder steel that is about to transport out of to be placed on to lifting appliance for bridge girder erection machine, bottom rail lift in the space that beam and wire rope enclose, and uses Beam transportation vehicle to transport out of.
In step 5, girder steel is hung and front Hoisting Position is reinforced, reinforcement means is for adopting two channel-section steels to carry out consolidation process to the upper and lower horizontal brace of existing bridging, diagonal brace, between cutting seam, by every 5m correspondence, one group of intermediate isolating anti-sticking steel plate 9(30cm*30cm is set), and coat butter on intermediate isolating anti-sticking steel plate; The method that bridge deck is hung is for first lifting by crane central sill 8, rear lifting both sides side bar 19.As Fig. 7 arranges schematic diagram to the protection of third and fourth " point " bridging position, Fig. 8 arranges schematic diagram to third and fourth " point " without the protection of bridging position.
Bridge crossing of the present invention refers to Combined concrete steel bridge.Fig. 2 is the existing profile of old bridge, and its structure is six girder steels, on it, is concrete bridge deck, is combined as concrete steel bridge.
In one embodiment , before being cut, bridge deck needs to carry out grounding,contact net and branch-cut bridge ground connection are processed by power-feed section, girder steel all needs independent grounding processing after being separated into 3 combined girder steels, when bridging operation, need independent grounding processing, resistance is less than 6 ohm after testing, is asked for instructions after power-feed section coordinative construction supervisor agrees to and can be carried out next procedure operation by safety monitor length.
protective baffle plate is installed(effect of protective baffle plate is that while preventing that the cutting of guardrail and anti-throwing net from hanging, broken thing comes off)
The installation of protected apron with hang operation:
Operation unit: protective baffle plate of every installation is an operation unit (being as the criterion with technician's unwrapping wire);
Personnel's configuration: each operation unit is equipped with 11 people, operation group leader 1 people, lifting hand 1 people, draws windproof rope 3 people, coordinates 5 people, protects 2 people under bridge;
Equipment collocation of the machinery group: each unit is equipped with one, 8 tons of cranes, and gas cutting 1 overlaps, 2 of windproof ropes, 2 of protection flag, the whistle and Walkie talkies.
Install and hang
Install: when receiving after works order, crane is placed in optimum position by hoistman, lifts by crane manufactured protective baffle plate, and two protected personnels pin down windproof rope and properly protect, and two cooperation personnel scoop out in the bearing of protective baffle plate; After protective baffle plate is in place, tighten up with expansion bolt, crane barre becomes 75 degree angle locks with suspension centre, and two protected personnels lock windproof rope.
Hang: confirm that through operation group leader and long inspection of safety monitor anti-throwing net and guardrail thoroughly shift out original position, after all broken things are cleaned out, two protected personnels are removed windproof rope and carry out draught exclusion device, two cooperation personnel remove expansion bolt, by hoistman lifting protective baffle plate, repeat above-mentioned installation exercise content, protective baffle plate is arranged on to next operation unit.
Activity duration: crane (5 minutes) in place, lifting protective baffle plate (3 minutes), in place and installation (8 minutes); When second unit operation, hang and reinstall (22 minutes).
remove operation technique and the method for protective screening, guardrail
Operation unit: every 3.5 meters of guardrails and anti-throwing net are a unit (being as the criterion with technician's unwrapping wire);
Personnel's configuration: each operation unit is equipped with 11 people, operation group leader 1 people, lifting hand 1 people, broken hand 3 people, cutting hand 2 people, gas cutting hand 2 people, protect 2 people under bridge;
Equipment collocation of the machinery group: each unit is equipped with one, 8 tons of cranes, 1 of portable cutting machine for steel reinforced concrete, gas cutting 1 overlaps, 2, air compressor machine, pneumatic pick, (each 2 of pneumatic pick drilling rod 300,400, two operation unit typhoon pick for subsequent use), hammer 2 into shape, 2, spade, 2 of besoms for 8 pounds, 4 of safety ropes, 2 of windproof ropes, fire extinguisher 1 overlaps, 1 of slag waggon, 2 kilograms, iron wire for subsequent use, 2 of protection flag, the whistle and Walkie talkies, windproof flat mirror 10 pairs;
Cut apart and hang
Lifting hand is in place by hanging device, operation group leader coordinate lifting hand by the anti-throwing net of this unit according to the nylon rope of removing the center of gravity colligation ∮ 20mm in unit, be connected with hanging device is vertical, lifting hand tightens up hoisting rope; Check the colligation of Lift-on/Lift-off System and the certain order of assigning detached job when errorless of lifting by full-time security official; Receiving full-time security official assigns after detached job order, gas cutting hand separates the anti-throwing net of this unit, concrete cutting hand cuts two guardrails setting posts and is connected steelframe with horizontal concrete, after operation group leader checks that the anti-throwing net of confirmation separates thoroughly with bridge floor guardrail, notice lifting hand hangs anti-throwing net and cut guardrail to bridge floor top, appears on the scene in order to roping; Check guardrail dismounting place without residue and after cleaning out through full-time security official, notice protective baffle plate is removed protective baffle plate (when two unit parallel operations, being strictly on guard against two unit process phase mutual interference) as owner, after remove thing roping.
Engineering time: (activity duration of 1 unit), put after operation, cut off the electricity supply and notify step by step power cut-off information (10 minutes), crane in place and install protective baffle plate (15 minutes), cut an anti-throwing net in unit and cutting two guardrails and erect post and horizontal concrete connecting rod (10 minutes), set level baluster and protective screening (5 minutes), baffle plate hangs (5 minutes), motor-driven (5 minutes), share time 50 minutes; The activity duration of three unit is 150 minutes, and full-bridge needs 4 points altogether.
protected apron and canvas cloth are installed
Operation unit: every 10 meters of protection are as a unit (being as the criterion to confide a technological secret);
Personnel's configuration: each operation unit configures 11 people, operation group leader 1 people, lifting hand 1 people, gas cutting hand 4 people, rope saw cutting hand 5 people;
Equipment collocation of the machinery group: each unit is equipped with gas cutting 1 and overlaps, 1 of hanging device, rope saw 1 overlaps, 1 of electric saw for woodworking, 2 of claw hammers, 5 kilograms, 8# iron wire for subsequent use, 20 meters, rope of nylon rope, 4, safety belt, waterproof gasket cement, 4, sponge, 4 of buckets, cotton yarn, 2 pairs of insulation water shoes, 4 pairs of insulating gloves, 4 of illumination head lamps, electric welding machine 500 types 2 overlap, and gas cutting equipment 4 overlaps;
Flow chart and method:
The first step is opened four operation skylights (upper and lower mouthful of the work when laying plank and canvas cloth) skylight opening by two rope saws cutting hands and is of a size of 90cm*150cm at bridge two ends, the concrete size of skylight opening as shown in Figure 3,4,3T simple lifting equipment lifting for the steel concrete plate putting in a skylight, before lifting, by full-time security official, the colligation to tackling system and lifting are locked into row inspection, confirm safe and punctual after, notice lifting hand hangs operation.
Branch-cut bridge contact net lines left and right sides (each 2m is long) protected apron is installed and is removed and utilize vertical blockade point to carry out operation.
Plank is laid 4 of works, on bridge floor, coordinate 3 people, 3 people (fastening safety rope) under bridge floor, the plank of having (177cm*20cm*5cm) made to order is taken and is layered between girder steel, with long 2m, the steel band of wide 20cm and steel beam bottom bolt connect (fixed two places of the corresponding bolt of every 200cm), submit a report asking for security official's inspection and be confirmed whether the effect that reaches windproof after this unit process finishes, and confirm can cut after safe and punctual the construction of bridging operation.(schematic diagram after cutting bridging installation protected apron as shown in Figure 5)
Plank is laid work and is returned after bridge floor, and two of gas cutting operators carry out separation cuts to the bridging in this unit, and gas cutting operator must be with hand grinding tool, will cut sanding burr smooth.Angle steel after separation hangs out bridge floor after cooling to room temperature.After unit process, submit a report asking for after full-time security official's inspection, can carry out plastics waterproofing cloth and mat formation.
Second step is that canvas cloth is installed, and (installation of canvas cloth is to be installed in order to outside by inner side) lays work by two canvas clothes, on people's bridge floor, under people's bridge floor, fixed ready-made splash guard (180 cm*200cm*0.5cm) is laid on plank; The lap length of plate and plate is 5cm, carries out encapsulation process with adhesive waterproof tape.Protected apron and canvas cloth are connected as a single entity with plastic rivet.After unit process, submit a report asking for after full-time security official's inspection, submit a report asking for full-time security official and the row special examination of safety monitor progress and examination.
Safe construction scope is determined and the order that stops operation is assigned
Owing to there being the existence of branch-cut bridge below bridge, causing above-mentioned installation protective baffle plate to remove anti-throwing net and guardrail and protected apron, canvas cloth and discrete bridge deck are installed has construction blind area phenomenon.To this, before construction, must indicate dangerous operating area at bridge floor by person in charge of the technology aspect, forbid encroachment line operation.In the time that upper and lower line is blocked in vertical skylight, could this region of operation.
discrete bridge deck
Main span line bridge deck (containing the layer of mating formation) are carried out to the cutting of the 25cm degree of depth, stay 5cm not cut, to prevent cutting cooling water flow under bridge.When cutting, adopt the machine of illegally occupying all to cut along line of cut, and cutting track is installed, ensure that cutting seam is vertical, line of cut is straight.
After protected apron and canvas cloth are installed, to bridge floor residue, 5cm carries out operation cutting in maintenance skylight point.
Operation unit: longitudinally every 5 meters is a cutter unit, (being as the criterion with technician's unwrapping wire);
Personnel's configuration: 1 of operation group leader, dish saw operator 4 people, rope saw coordinates 5 of personnel, coordinating operation 1 people (wire rope handling) under beam slab;
Equipment collocation of the machinery group: each one of each unit outfit dish saw, rope saw, 4,1.5m track, 12 meters, Buddha's warrior attendant rope, one of hydraulic tongs, one of sander, one of air compressor machine, one of air pressure gun, one, submersible pump, 2 of Walkie talkies (every two unit are equipped with one of rope saw);
Operation technique and method:
The sawing of two ropes is cut hand and is installed rope saw, and rope saw installs laggard line space and turns test-run a machine, submits a report asking for full-time security official and checks, confirms safe and punctual rear standby.
Two boring personnel in cutting equipment one end, bore open-works one every 5 meters along line of cut;
Three coordinate personnel wire rope handling saw, joint, tighten up track, install cutting machine protective frame, submit a report asking for full-time security official and check after test-run a machine, confirm safe and punctual rear beginning cutting and separating;
During cutting, carry out operation in strict accordance with equipment operating specification.Ensure the coincidence of line of cut, hydraulic pressure is not more than 100Mpa, and cutting rotating hydraulic pressure is not more than 100Mpa; After unit process, submit a report asking for after full-time security official's inspection, submit a report asking for full-time security official and the row special examination of safety monitor progress and examination.
What stop operation and make assigns
The long inspection of safety monitor confirmed to report operation situation to the secure supervisor of station section coordinative construction after operation, and after must agreeing to, assigning stops operation makes (notice liaison man in station disappears a little, and the line that reopens for business is normally runed).
Engineering time calculate: after main points, cut off the electricity supply notify step by step power cut-off information share 10 minutes, cutting speed 2.5m/h, a circulation 5m, 120 minutes used times, wire rope handling 30 minutes, share time 160 minutes.2 unit operations simultaneously, need 2 points altogether.
remove protected apron, canvas cloth and open hoisting port
Operation unit: every 10 meters as a unit (being as the criterion to confide a technological secret);
Personnel's configuration: each operation unit configures 11 people, operation group leader 1 people, hand 2 people are cut in rope sawing, coordinate 2 people, 2, lifting hand, gas cutting hand 2 people, coordinate 2 people;
Equipment collocation of the machinery group: each unit is equipped with 1 of rope saw, one of simple and easy hoisting equipment, gas cutting 1 overlaps, and 1, handsaw is hammered 1 into shape for eight pounds;
Flow chart and method:
Entered under bridge floor the ponding in canvas cloth is removed totally by two gas cutting personnel, segmentation cuts open canvas cloth to be transported to skylight opening, and canvas cloth is proposed bridge floor by two cooperation personnel;
Two gas cutting personnel remove angle steel pressing plate one by one from bridge middle part to both sides, take out plank, then (anti-fall processing is carried out to lateral ties channel-section steel before separating in contact net top to separate lateral ties channel-section steel with gas cutting, the method of processing is with No. 8 iron wire bindings, by operation, group leader pins down, the cutting of gas cutting hand, forbids lateral ties channel-section steel to fall), repeat above-mentioned operation and one by one protected apron is removed;
Hand installing rope saw on the skylight position line of demarcating is cut in rope sawing, and four jiaos in skylight pore-formings of air pressure gun hand perforating on skylight, for mounting hanger.Then, two cooperation personnel alter splicing saw and implement cutting.
After skylight board perforating, lifting hand mounting hanger hangs tight skylight board, in case skylight board falls, to be cut after, skylight board is hung to bridge floor.
After above-mentioned operation, by full-time security official and safety monitor length, above-mentioned operation is inspected for acceptance, confirm safe and punctual after, assign the order that stops operation.
Engineering time calculates: after main points, cut off the electricity supply while notifying step by step power cut-off information to share 15 minutes, remove 8m tank 55 minutes, dig out hole for hoist 30 minutes, motor-driven 15 minutes, amount to 115 minutes.
the operation of construction blind area residue engineering quantity
Protective baffle plate is installed and is removed bridge floor remaining 6 meters and guardrail and anti-throwing net.Repeat the installation of protected apron and hang job step (18 minutes time)
Remaining 6 meters of protected aprons and canvas cloth are installed, with upper step parallel operations, are repeated the step (5 minutes time) that the bridging in unit is carried out separation cuts and canvas cloth is installed.
Discrete remaining 6 meters of bridge decks.Within the maintenance skylight engineering time, first cut remaining 6 meters of bridge deck with dish saw cutting machine, depth of cut is 30cm.After power failure is blocked in up-downgoing, repeat cutting action (15 minutes time).
Remove 6 meters of remaining protected aprons, 6 meters of canvas clothes (5 minutes time).Amount to 25 minutes.
After protection complete removal, bridge floor is discrete as shown in Figure 6.
bridge Erector hangs to be torn compound beam operation open and will put Time Calculation:
Preparation
Ready work before construction, check whether the personnel, equipment and the goods and materials that in various administrative staff, operator, protected personnel and emergency response, are equipped with put in place, before hanging beam, first technician confides a technological secret to operating personnel, and institute's hanging beam position dimension is conscientiously told somebody what one's real intentions are, checked.Secure group conscientiously checks the welding quality of each reinforcing solder joint.Guarantee that each stressed member belongs to safe condition.
The selection of wire rope
Lifting is selected K=10 by the safety factor of wire rope, and calculating is selected as follows: consider that the engineering later stage may be box beam erection, the stressed checking computations of the weight with 2 40m girder steels and girder steel top concrete of wire rope for the sake of assurance.Wire rope and horizontal plane angle а=70.6 °, four suspension centre n=4,40m combined girder steel deadweight: Q=137.02t, the internal force T=Q/n/cos19.4 of one-sided suspension centre 68.51t wire rope °=363.2KN, safety factor is by 10 times of calculating, 363.2*10=3632KN, select the wire rope that nominal tensile strength is 1870Mpa, 3632/1870=1942mm 2, adopting 6*37+1 rope, rope footpath is two new wire rope of Ф 40mm, single wire rope steel wire total basal area is 2513.2mm 2>1942mm 2.
Consider the various factors of bridge crossing dismounting and the concrete size of compound beam, after relatively, select the capital equipment of HJQa220/40A3 type highway bridging machine as construction.
The installation of Hoisting Position reinforcing and suspender
Bridge floor cuts after discrete and protective equipment dismounting, the complete 3 case beams that are integrated by two girder steels that are separated into of Combined concrete steel bridge, approximately 140 tons, the new case beam combining of every a slice as calculated, for ensureing Bridge Erector job safety, first suspender is carried out to primary structure member inspection, Hoisting Position is reinforced, and its method is to adopt two 20 #channel-section steel carries out consolidation process to the upper and lower horizontal brace of existing bridging, diagonal brace, in case produce and distort when steel beam lifting, consolidation process figure as shown in figure 11.Jam increase impact lifting arranges one group of intermediate isolating steel plate (30cm*30cm) by every 5m correspondence for this reason between cutting seam, is beneficial to lifting for coating butter on minimizing frictional force intermediate isolating steel plate.
Bridge Erector is assembled
Assembled Bridge Erector on direction (the present embodiment is Zhengzhou direction) the 2nd, the 3 bridge faces of removed bridge section, assembles main structure of a bridge center.Before assembling, machine management personnel should conscientiously check quality, size, the angle of various members, and defective member does not allow to carry out assembled, and two 25t automobile cranes coordinate.After Bridge Erector has been assembled, need trial run, after self-inspection is qualified, report local special equipment testing department to be up to the standards, the operation of can setting a roof beam in place.Bridge Erector power supply connects double loop power supply, and a road connects railway north high-voltage line, and a road connects provides 150KW emergency generator for oneself, guarantees not remove because supply of electric power affects old bridge.The constructor that all participations take down the old bridge need take appointment with certificate, and will after relevant special training, can participate in operation.
Lay Bridge Erector cross moving track
Lay Bridge Erector cross moving track, front leg strut cross moving track adopts the parallel connection of 43Kg rail and sleeper to lay, and track bottom surface is higher than the anti-knock block on bent cap.Specific practice is that sleeper buttress or steel cylinder buttress lie against on bent cap; Middle supporting leg cross moving track, for sizing square beam, is divided into sleeper one row, with plank advance expenditure levelling; Rear support leg below is set up sleeper buttress and is supported.The cross moving track that requires front leg strut and middle supporting leg the position, two edges of bridge higher than bridge in the middle of, ensure the cross moving track gradient serve as reasons in the middle of to both sides for going up a slope, rear support leg below sleeper buttress firm supporting is stablized.Bridge Erector use all support sleepers and lay the sleeper used of track inaccurate rotten, fracture and the soft material of using without exception, also must not use the lumps of wood to replace, guarantee that Bridge Erector each portion firm supporting under any state is stable.Cross moving track two ends arrange car stop, prevent from that bridge machine from sliding to topple.
Bridge Erector via hole is located with instrument
Bridge Erector via hole requires with instrument location, ensures that Bridge Erector is consistent with bridge direction, after Bridge Erector puts in place, should support immediately, reinforce, and makes Bridge Erector under static state perfectly safe, after the running gear of rear trial run frame machine in place is errorless, treats a lifting.Bridge Erector flow diagram as shown in Figure 12,13.
Lifting central sill (the 3rd vertical skylight point, 30 minutes time)
Receive and block after power off notifying, safety monitor length is assigned lifting central sill operation order;
Overhead traveling crane motor operation hand is received after lifting operation order, the vertical hanging beam of starter motor, beam body is sling after 10cm, checks the large arm amount of deflection of Bridge Erector and the stability of each fulcrum and the state of each anti-sticking sliding steel plate, box beam put in place (sling height 3.4m) while confirming that Bridge Erector belongs to normal condition.(5 minutes)
Start 1 #2 #overhead traveling crane synchronously by case beam expenditure the 4th across, be placed on stably on the rear flat car for transport of sills having prepared, after case beam and flat car for transport of sills binding are firm, sail out of operation field (5 minutes).Then, registration disappears a little, and the line that reopens for business is normally runed.
Lifting both sides side bars (the present embodiment is Beijing side girders, the 4th vertical skylight point, 30 minutes time)
Overhead traveling crane motor operation hand is received after lifting operation order, vertical lifting side bar (1 minute), observe Bridge Erector state (1 minute), (3 minutes) are put down in traversing Bridge Erector to central sill position, change suspension centre (decoupling device, overhead traveling crane promote transposition, crown block sling moves down, links up with 12 minutes used times altogether), the time is 17 minutes.Reinforce support combinations beam two ends, make beam body in stable state (3 minutes), after the long inspection of safety monitor is errorless, all systems of locking Bridge Erector, report liaison man in station disappears a little, restores electricity, normally operation.
Lifting opposite side side bar (the present embodiment is Beijing side girders, the 5th vertical skylight point, 30 minutes time)
Repeat the job content of above-mentioned lifting central sill step, case beam is transported to bridge floor (18 minutes).After beam body hangs, coordinate personnel to remove rapidly bridge pad and clean out losing the foreign material that fall by 4 Bridge Erectors, then, a registration that disappears, the line that reopens for business is normally runed.
Lifting side girders (the present embodiment is Guangzhou side girders, the 6th vertical skylight point, 30 minutes time)
Repeat the job content of above-mentioned lifting side girders step, then, a registration that disappears, the line that reopens for business is normally runed.
Lifting side girders (the present embodiment is Guangzhou side girders, the 7th vertical skylight point, 30 minutes time)
Repeat the job content of above-mentioned lifting central sill step, case beam is transported to bridge floor (18 minutes).After beam body hangs, coordinate personnel to remove rapidly bridge pad and clean out losing the foreign material that fall by 4 Bridge Erectors, then, a registration that disappears, the line that reopens for business is normally runed.
Bridge Erector goes back to hole (the 8th vertical skylight point, 30 minutes time)
Equipment inspection is good, personnel put in place, blocks point and starts rear blockade power failure, sets protection, 3 minutes time.
Pack up front leg strut, Bridge Erector goes back to hole, in the time that Bridge Erector is got back to 3# pier place bent cap, front leg strut rail is fixed on bent cap, and by fixing Bridge Erector firm.15 minutes time.
Clear up according to the rules job site, some Bi Kaitong circuit, 3 minutes time.
Bridge Erector returns Kong Gongxu blockade and will put 21 minutes.
The technological process of lifting main span combined girder steel is:
Step 1: Bridge Erector is 0 #after platform on roadbed to 3 #after the assembling of pier rear, vertical shift to the 4 is across in place.
Step 2: Bridge Erector divides three groups of liftings to remove 6 concrete combined girder steels.
Step 3: after Bridge Erector two overhead traveling cranes liftings compound beams, move to Beam transportation vehicle in the 2nd straddle mounting after longitudinally.
Step 4: after three groups of combined girder steels Remove All, Bridge Erector vertical shift retreat to the 3rd across, remove Bridge Erector, adopt 2 80 tons of mobile cranes to remove both sides and close on 20 meters of hollow slab beams of railway operation line and pier cap beam.
running railway line supervision (dismounting) constructure scheme
Preparation of construction
Running railway line construction exists potential threat to traffic safety, must be guaranteeing that safety is put into first place, adhere to the policy of " safety first, put prevention first ".Therefore, must improve crew's awareness of safety, strengthen each operating personnel's the sense of duty, pertinent regulations and requirement in strict implement in construction " Railway Bureau's running railway line Safety Management detailed rules for the implementation " file;
Before operation, carry out construction technology by site technology person in charge and tell somebody what one's real intentions are, make each operation hand know mechanical tool and the safety regulation for operations of job content, operation unit, operation technique and flow process, operation use; Hold site safety by the full-time security official in scene and produce the meeting of telling somebody what one's real intentions are, make each operation hand understand position, distance and the safeguard procedures of the emphasis of security protection in operation, control point, railways train operation equipment, equipment is worn in close inspection each operation hand prevention awareness and protection; Whether have by the long investigation of safety monitor last process the unsafe factor of leaving over, after thoroughly eliminating, the full-time security official of instruction, protection personnel enter work position, and the safety supervision personnel of request station section coordinative construction agree to rear issue job instruction;
Remove top guardrail and ancillary facility
Remove guardrail and should note, according to the principle of " below after above first, large part after first smallclothes ", adopting manual demolition, forbid cruelty to be constructed; Take rope safeguard procedures, carry out the protection of segmentation fence under bridge, eye-catching protection safety mark, label are set before and after construction section, on bridge, bridge sends special messenger's protection on duty and relieve traffic congestion, on bridge, under bridge, operator on duty is equipped with Walkie talkie contact.In order to avoid guard rail, fragment fall, the injury to the pedestrian on walkway under bridge, dilly and damage.
It should be noted that; above-mentioned specific embodiment is only exemplary; under above-mentioned instruction of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion all drop in protection scope of the present invention.It will be understood by those skilled in the art that specific descriptions are above in order to explain object of the present invention, not for limiting the present invention.Protection scope of the present invention is limited by claim and equivalent thereof.

Claims (8)

1. a bridge crossing method for dismounting, is characterized in that, comprises the following steps:
Step 1: bridge crossing cross-line main span bridge floor top board is longitudinally cut, form three Π section steel beam unit, retain first bridge floor bottom 5-6cm thickness and do not cut in the situation that not sealing under bridge traffic;
Step 2: to closing a road to traffic under the bridge of bridge crossing Demolition Construction position;
Step 3: the bridge floor cutting that bottom is reserved as to 5-6cm thickness is saturating;
Step 4: use lifting device by the girder steel clamping after cutting;
Step 5: use lifting device that the girder steel of integral retaining is hung.
2. bridge crossing method for dismounting as claimed in claim 1, it is characterized in that: before in step 1, bridge crossing cross-line main span bridge floor top board being cut, at bridge deck construction location, L-type protective baffle plate is installed, is removed anti-throwing net, guardrail, and protected apron and canvas cloth are installed.
3. bridge crossing method for dismounting as claimed in claim 2, is characterized in that: in step 3, by after bridge floor cutting thoroughly, remove protected apron, canvas cloth and open hoisting port (3).
4. bridge crossing method for dismounting as claimed in claim 3, it is characterized in that: the structure of lifting device described in step 4 is: lifting appliance for bridge girder erection machine (10) and bottom rail are lifted and longitudinally corresponding respectively on beam (14) two groups of steel pin (13) be set, and connect by wire rope (12) between every group of steel pin.
5. bridge crossing method for dismounting as claimed in claim 4, is characterized in that: the method for using lifting device to hang girder steel in step 5 is clamping bridge floor to be placed on to lifting appliance for bridge girder erection machine, bottom rail lift in the space that beam and wire rope enclose, and uses Beam transportation vehicle to transport out of.
6. bridge crossing method for dismounting as claimed in claim 5, it is characterized in that: in step 5, girder steel is hung and front Hoisting Position is reinforced, reinforcement means is for adopting two channel-section steels to carry out consolidation process to the upper and lower horizontal brace of existing bridging, diagonal brace, between cutting seam, by every 5m correspondence, one group of intermediate isolating anti-sticking steel plate is set, and coats butter on intermediate isolating steel plate.
7. bridge crossing method for dismounting as claimed in claim 6, is characterized in that: the method in step 5, girder steel being hung is for first lifting by crane central sill (8), rear lifting both sides side bars (19).
8. the bridge crossing method for dismounting as described in claim 1-7 any one, is characterized in that: described bridge crossing refers to Combined concrete steel bridge.
CN201410087126.7A 2014-03-11 2014-03-11 A kind of bridge crossing method for dismounting Expired - Fee Related CN103938557B (en)

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CN104708113A (en) * 2015-02-04 2015-06-17 中铁十八局集团第一工程有限公司 Cutting process of urban overpass steel box girder
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CN108049314A (en) * 2017-12-12 2018-05-18 中交公局第二工程有限公司 A kind of bridge double layer box beam construction method
CN108457207A (en) * 2018-04-08 2018-08-28 中铁八局集团第二工程有限公司 Utilize the method for the vertical line multispan bridge beam body dismounting of even carrying on the business of Bridge Erector
CN109208493A (en) * 2018-09-07 2019-01-15 南昌大学 A kind of cross-line single-box multi-cell cast-in-situ steel reinforced concrete bridge superstructure Demolition Construction method
CN110273385A (en) * 2019-04-03 2019-09-24 中铁大桥局武汉桥梁特种技术有限公司 A kind of across concrete box girder method for dismounting in cross-line hole
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CN104480868A (en) * 2014-12-13 2015-04-01 中铁十九局集团第二工程有限公司 Beam detaching method for road bridge overpassing operation railway
CN104480868B (en) * 2014-12-13 2016-06-22 中铁十九局集团第二工程有限公司 On tear beam method open across the highway bridge of railway in operation
CN104708113A (en) * 2015-02-04 2015-06-17 中铁十八局集团第一工程有限公司 Cutting process of urban overpass steel box girder
CN104652299A (en) * 2015-02-05 2015-05-27 中铁六局集团有限公司 Electrified railway existing bridge and culvert whole-hole moving-out construction method
CN104652299B (en) * 2015-02-05 2016-05-11 中铁六局集团有限公司 Construction method is shifted out in the whole hole of a kind of existing bridges and culverts of electric railway
CN107217605A (en) * 2016-03-21 2017-09-29 浙江大学 A kind of continuous beam Demolition Construction method
CN106192781A (en) * 2016-07-21 2016-12-07 中电建路桥集团有限公司 The method for dismounting of prestressing force list case three Room plate-girder
CN106284109A (en) * 2016-08-17 2017-01-04 中铁二十局集团第三工程有限公司 On across the most wired bridge main beam method for dismounting
CN106149576A (en) * 2016-08-17 2016-11-23 中铁二十局集团第三工程有限公司 On across the whole assembling and dismantling of the most wired bridge except and construction method of installation
CN106284109B (en) * 2016-08-17 2018-02-06 中铁二十局集团第三工程有限公司 On across both wired bridge main beam method for dismounting
CN106276602A (en) * 2016-08-29 2017-01-04 中铁十局集团建筑安装工程有限公司 One hangs method across high ferro Business Line beam body
CN108049314A (en) * 2017-12-12 2018-05-18 中交公局第二工程有限公司 A kind of bridge double layer box beam construction method
CN108457207B (en) * 2018-04-08 2020-05-19 中铁八局集团第二工程有限公司 Method for dismantling multi-span bridge body of operation line by utilizing longitudinal connection of bridge girder erection machine
CN108457207A (en) * 2018-04-08 2018-08-28 中铁八局集团第二工程有限公司 Utilize the method for the vertical line multispan bridge beam body dismounting of even carrying on the business of Bridge Erector
CN109208493A (en) * 2018-09-07 2019-01-15 南昌大学 A kind of cross-line single-box multi-cell cast-in-situ steel reinforced concrete bridge superstructure Demolition Construction method
CN110273385A (en) * 2019-04-03 2019-09-24 中铁大桥局武汉桥梁特种技术有限公司 A kind of across concrete box girder method for dismounting in cross-line hole
CN110904868A (en) * 2019-12-19 2020-03-24 贵州大成恒通建设工程有限公司 Bridge dismantling construction method for reverse segment hoisting of bridge girder erection machine
CN111441610A (en) * 2020-06-08 2020-07-24 赖润肴 Building auxiliary beam demolishs device
CN111441610B (en) * 2020-06-08 2021-11-23 凤阳县天龙水利建筑工程有限公司 Building auxiliary beam demolishs device

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