CN114525737A - Bridge deck type movable formwork via hole braking system and braking method - Google Patents
Bridge deck type movable formwork via hole braking system and braking method Download PDFInfo
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- CN114525737A CN114525737A CN202210201725.1A CN202210201725A CN114525737A CN 114525737 A CN114525737 A CN 114525737A CN 202210201725 A CN202210201725 A CN 202210201725A CN 114525737 A CN114525737 A CN 114525737A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention relates to a via hole braking system for a bridge deck type movable mould frame, which comprises a plurality of pier columns, a beam body and a movable mould frame, wherein the movable mould frame comprises a main beam, a front supporting leg, a rear auxiliary leg, an outrigger, a hanging beam and an outer mould; the front end of the main beam is provided with the front support leg, and the rear end of the main beam is respectively provided with a rear support leg and a rear auxiliary leg; a plurality of uniformly arranged outriggers are respectively arranged on two sides of the main beam, each outrigger is connected with the hanging beam in a sliding manner, and the outer die is arranged between the plurality of hanging beams on each side of the main beam; two sides of two adjacent pier studs are respectively provided with a supporting steel frame, each supporting steel frame is provided with a winch, a multi-power steel wire rope is respectively arranged between the winch and the front and the back of the movable mould frame, and the winch is also provided with a tension and speed limiter. The invention also relates to a braking method for the via hole of the bridge deck type movable mould frame. The invention can effectively solve the braking problem in the operation process of the movable mould frame and avoid the occurrence of accidents.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge through hole brake system and a brake method for a deck type movable formwork.
Background
Along with the rapid development of scientific technology, the building technology and construction technology in China are also rapidly developed, wherein the movable formwork bridge fabrication machine is a construction machine which is provided with a template and is supported by a box girder to pour a bridge on site.
1, a movable formwork is adopted for bridge construction, a ground support is not required to be arranged, navigation and underbridge traffic are not influenced, and construction is safe and reliable; 2. the construction environment is good, the construction quality is guaranteed, a set of formwork can be recycled for multiple times, and the prefabricated formwork has the advantage of being produced in a prefabricated yard; 3. the mechanization and automation degree is high, the labor is saved, the labor intensity is reduced, the upper and lower structures can be operated in parallel, and the construction period is shortened; 4. the movable formwork is constructed hole by hole and is suitable for being used on a multi-span long bridge with the bridge span less than 50 m. So the movable mold frame is widely used at present.
The self weight of the movable mould base is large, and once a problem occurs in the running process of the through hole, the movable mould base is difficult to brake in time, so a series of braking measures are adopted in the invention, the braking problem in the running process of the movable mould base can be effectively solved, and the occurrence of accidents is avoided.
Disclosure of Invention
The invention provides a bridge through hole brake system and a brake method for a bearing type movable formwork, aiming at solving the problem that the movable formwork is difficult to brake in time in the construction and operation process, effectively solving the brake problem in the operation process of the movable formwork and avoiding accidents.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a via hole braking system of a bridge through-type movable formwork comprises a plurality of pier columns, a beam body erected between adjacent pier columns and a movable formwork, wherein the movable formwork comprises a main beam, a front support leg, a rear auxiliary leg, an outrigger, a hanging beam and an outer mold;
the front end of the main beam is provided with the front support leg to abut against the pier stud, the rear end of the main beam is respectively provided with the rear support leg and the rear auxiliary leg, and the rear support leg and the rear auxiliary leg both abut against the rear beam body;
the two sides of the main beam are respectively provided with a plurality of uniformly arranged outriggers, each outrigger is connected with the hanging beam in a sliding way, the outer molds are arranged among the plurality of hanging beams on each side of the main beam, and the outer molds on the two sides of the main beam surround the periphery of the previous beam body;
two sides of two adjacent pier studs are respectively provided with a supporting steel frame, each supporting steel frame is provided with a winch, a multi-time steel wire rope is respectively arranged between the winch and the front and the back of the movable mould frame for connection, and the winch is also provided with a tension and speed limiter;
and a chain block is arranged between the front supporting leg and the beam body in front and at the back for connection.
Further, the front end of the main beam extends forwards, and the rear end of the main beam spans between two adjacent piers; the cantilever beams are arranged on two sides of the rear end of the main beam and are inverted trapezoidal steel structure frames, oil cylinders are arranged between the cantilever beams and the hanging beams, the oil cylinders drive the hanging beams to transversely move to control the die assembly and the die release of the outer dies on two sides, the hanging beams are bent and downwards connected with the outer dies, and the outer dies are matched with the outline of the beam body.
Further, preceding landing leg and back landing leg all with the girder sliding connection and support the girder, preceding landing leg and back landing leg all include stand and crossbeam and be used for the hydro-cylinder of jacking movable mould frame, also be provided with the hydro-cylinder on the back auxiliary leg with jacking movable mould frame, the hydro-cylinder on preceding landing leg, back landing leg and the back auxiliary leg all can upwards jack-up movable mould frame.
Further, still be provided with on the preceding landing leg and indulge and move hydro-cylinder one, both sides all are provided with around the back landing leg and indulge and move hydro-cylinder two, indulge and move hydro-cylinder one and indulge and move the hydro-cylinder two and provide power for the antedisplacement of moving the die carrier, indulge and move all to be provided with the piston shoes on hydro-cylinder one and the indulge and move the hydro-cylinder two, the piston shoes with the girder sliding connection has seted up a plurality of track holes on the girder, and the piston shoes top is tightly at arbitrary track downthehole, still be provided with preceding round pin axle and back round pin axle on the piston shoes in order to unblock and locking girder.
Furthermore, a support rod is arranged between the rear support leg and the front beam body backwards to connect and anchor the rear support leg and the front beam body, so that the rear support leg is fixed; and an oblique-pulling anchor rod is arranged between the front support leg and the front pier stud to be connected, and a twisted steel bar is further arranged between the front support leg upright and the top of the pier stud to be anchored.
Furthermore, the number of the supporting steel frames is four, the supporting steel frames are respectively arranged on the left side and the right side of two adjacent pier studs, and the multi-power steel wire rope comprises a pulley block and a steel wire rope wound on the pulley block; two multi-power steel wire ropes on one pier column are connected with two hanging beams at the rear end of the main beam, and two multi-power steel wire ropes on an adjacent pier column are connected with two sides of the front end of the main beam.
A bridge deck type movable formwork through hole braking method comprises the following steps:
step 1: before demolding of the movable mold frame: the front supporting leg is fixedly connected with the pier stud; two chain blocks are adopted to tighten the front supporting leg beam and the front beam body; the four winches are respectively connected with the front end and the rear end of the movable mould frame through multi-time steel wire ropes; a first longitudinal moving oil cylinder on the front supporting leg is disconnected with the sliding shoe, and the sliding shoe is temporarily fixed;
step 2: normal demoulding of the movable mould frame: starting an oil cylinder between the cantilever beam and the hanging beam, and controlling outer molds on two sides of the main beam to move outwards and transversely open to avoid a pier stud;
and step 3: front supporting legs move forwards: the winch is inching, a certain amount of multi-magnification steel wire ropes is released, the oil cylinders on the rear auxiliary leg and the front support leg are started to extend out and lift up the movable die carrier, the rear support leg is controlled to move forwards to the end part of the front beam body after being emptied, the oil cylinders on the rear auxiliary leg and the front support leg retract, and the rear support leg falls on the beam body;
measuring the horizontal state of the rear supporting leg cross beam by using a leveling instrument, tensioning and anchoring the rear supporting leg cross beam and the beam body by using four support rods, and meanwhile, respectively arranging four expansion bolts on the periphery side of the rear supporting leg for limiting;
and 4, step 4: and (3) installing a longitudinal moving oil cylinder II: the front side and the rear side of the rear supporting leg are respectively provided with a second longitudinal moving oil cylinder, in an initial state, the two longitudinal moving oil cylinders are respectively in an extending state and a retracting state, a sliding shoe is arranged on the second longitudinal moving oil cylinder, the sliding shoe is connected to the main beam in a sliding manner, a front pin shaft and a rear pin shaft are inserted into the sliding shoe, and then the second longitudinal moving oil cylinder is controlled to slightly move so that the sliding shoe is tightly pressed against a rail hole of the main beam, so that the sliding shoe and the main beam are locked;
and 5: the movable mould frame moves forwards for the first time: 5.1, starting a winch and slowly releasing the rope for about 6m to stop;
step 5.2, controlling two longitudinal moving oil cylinders to respectively retract and extend to drive the main beam to move forwards by 800mm and stop; pulling out the rear pin shaft, the unlocking sliding shoe and the main beam on the two sliding shoes, and controlling the two longitudinal moving oil cylinders to respectively extend and retract to return to the initial state; a rear pin shaft and a micro-motion longitudinal moving oil cylinder II tightly push a main beam to lock the sliding shoe and the main beam for moving forwards again;
step 5.3, circularly repeating the step 5.2 until the whole machine moves forwards for 10m, and completing the first hole passing of the movable mould frame;
step 6: front supporting legs move forwards: controlling a winch to tighten the movable mould frame; on the premise of ensuring the stability of the rear supporting leg, removing the fixed structure of the front supporting leg and the pier stud and the chain block; mounting a first longitudinal moving oil cylinder on the front supporting leg with the sliding shoe; controlling a rear support oil cylinder to extend out and lift up the movable mould frame, controlling a front support to move forwards to a pier column in front after the front support is emptied, and installing a cable-stayed anchor rod between a front support beam and the pier column;
and 7: moving the movable die carrier forward again: 7.1, in an initial state, the first longitudinal moving oil cylinder is in a retraction state, a front pin shaft and a rear pin shaft are installed on a sliding shoe on the first longitudinal moving oil cylinder, the first longitudinal moving oil cylinder is slightly pressed against a main beam to realize locking of the sliding shoe and the main beam, and the second longitudinal moving oil cylinder is controlled to be in the initial state;
7.2, starting the winch and slowly releasing the rope for about 6m to stop;
7.3, controlling two longitudinal moving oil cylinders to respectively retract and extend, and synchronously controlling one longitudinal moving oil cylinder to extend to drive the main beam to move forwards by 1000mm to stop; pulling out the rear pin shafts, the unlocking sliding shoes and the main beam on the three sliding shoes, and controlling the first longitudinally moving oil cylinder and the second longitudinally moving oil cylinder to an initial state again; a rear pin shaft, a first micro-motion longitudinal moving oil cylinder and a second longitudinal moving oil cylinder are mounted to tightly push the main beam to lock the sliding shoe and the main beam for moving forwards again;
7.4, circularly repeating the step 7.3, and simultaneously controlling the winch to synchronously release the rope for braking until the whole machine moves forwards by 18m and stops;
and 8: removing a second longitudinal moving oil cylinder and a corresponding sliding shoe which are positioned behind the rear supporting leg, continuing to move forwards for 2m according to the step 7.3 to enable the movable mould frame to move in place, and monitoring the horizontal states of the front supporting leg and the rear supporting leg cross beam in real time by adopting a level gauge in the moving process;
and step 9: and starting an oil cylinder between the cantilever beam and the hanging beam, and controlling outer molds on two sides of the main beam to move inwards and transversely close to carry out mold closing so as to build a new beam body again.
Through the technical scheme, the invention has the beneficial effects that:
the invention has reasonable structural design, combines the winch with the multi-power steel wire rope, greatly reduces the stress of a single steel wire rope, improves the efficiency of the winch and ensures that the engineering operation is safer. By installing the tension and speed limiter on the winch, the tension of a single steel wire rope and the moving speed of the movable die carrier can be monitored in real time, the tension load tonnage of the single rope and the moving speed of the die carrier are limited, the single rope needs to be stopped and moved in time when the single rope exceeds the moving speed, and the single rope can be continuously moved forwards after being continuously released. The leveling instrument is adopted to monitor the front main supporting leg and the rear main supporting leg, so that the cross beam is always in a horizontal state, and the safety is guaranteed.
In the whole process of advancing the through hole, the movable formwork is limited and protected by the matching of the winch and the multi-magnification steel wire rope, the construction is safe, the operation is simple, the brake can be timely performed, the safety and the reliability are realized, and the smoothness of the through hole is ensured.
Drawings
Fig. 1 is a front view of a bridge deck moving formwork via hole braking system.
Fig. 2 is a top view of the bridge deck moving formwork via hole braking system.
Fig. 3 is a schematic view of the brake system for the through hole of the bridge deck type movable formwork in the direction of a in fig. 1.
Fig. 4 is a schematic view of a bridge deck type moving formwork through hole braking system in the direction B in fig. 1.
Fig. 5 is a schematic view of step 2 of the bridge deck type moving formwork via hole braking method of the invention.
Fig. 6 is a schematic diagram of step 3 of the bridge deck type moving formwork via hole braking method.
Fig. 7 is a schematic diagram of step 4 of the bridge deck moving formwork via hole braking method of the invention, wherein the front support leg is not shown.
Fig. 8 is an enlarged schematic view of a part C in fig. 7 of a bridge deck type moving formwork via hole braking method according to the present invention.
Fig. 9 is a schematic view of step 5.2 of the bridge deck moving formwork via hole braking method of the invention.
Fig. 10 is a schematic view of step 5.3 of the bridge deck moving formwork via hole braking method of the invention.
Fig. 11 is a schematic view of step 7.1 of the bridge deck moving formwork via hole braking method of the invention.
Fig. 12 is a schematic view of step 7.3 of the bridge deck moving formwork via hole braking method according to the invention.
Fig. 13 is a schematic view of step 8 of the method for braking the via hole of the bridge deck type mobile formwork according to the present invention.
Fig. 14 is a second schematic view of step 8 of the method for braking the via hole of the bridge deck type mobile formwork according to the present invention.
The reference numbers in the drawings are as follows: the device comprises a pier column 1, a beam body 2, a main beam 3, a front supporting leg 4, a rear supporting leg 5, a rear auxiliary leg 6, an outrigger 7, a hanging beam 8, an outer mold 9, a supporting steel frame 10, a winch 11, a multi-time steel wire rope 12, a chain block 13, a longitudinal moving oil cylinder I14, a longitudinal moving oil cylinder II 15, a sliding shoe 16, a front pin shaft 17, a rear pin shaft 18, a supporting rod 19 and a diagonal anchor rod 20.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
as shown in fig. 1 to 4, the via hole braking system for the bridge upper-supporting type movable formwork comprises a plurality of pier studs 1, a beam body 2 erected between two adjacent pier studs 1 and the movable formwork, wherein the movable formwork comprises a main beam 3, a front supporting leg 4, a rear supporting leg 5, a rear auxiliary leg 6, an outrigger 7, a hanging beam 8 and an outer mold 9.
3 rear ends of girder span between two adjacent pier stud 1 and 3 front ends of girder extend forward, and 3 front ends of girder set up preceding landing leg 4 sets up respectively in order to support on pier stud 1 rear leg 5 and back auxiliary leg 6, and back landing leg 5 and back auxiliary leg 6 all support the back one on the roof beam body 2.
Preceding landing leg 4 and back landing leg 5 all with girder 3 sliding connection, 3 lateral sliding can be followed along girder to preceding landing leg 4 and back landing leg 5 promptly, and preceding landing leg 4 and back landing leg 5 all include stand and crossbeam and are used for the hydro-cylinder of jacking moving die carrier, also be provided with the hydro-cylinder with jacking moving die carrier on the supplementary leg 6 in back.
The cantilever beams 7 are arranged on two sides of the main beam 3 respectively and are uniformly arranged, specifically, the cantilever beams 7 are arranged on two sides of the rear end of the main beam 3, and the cantilever beams 7 are inverted trapezoidal steel structure frames.
Each cantilever beam 7 is connected with a hanging beam 8 in a sliding mode, the outer molds 9 are arranged between the hanging beams 8 on each side of the main beam 3, and specifically, the hanging beams 8 are bent and connected with the outer molds 9 downwards. The outer die 9 is matched with the outline of the beam body 2, and the outer dies 9 on two sides of the main beam 3 surround the periphery of the previous beam body 2.
In order to realize the sliding of the hanging beam 8, an oil cylinder is arranged between the cantilever beam 7 and the hanging beam 8 to control the die assembly and the die release of the outer dies 9 on the two sides. The hanging beams 8 on two sides of the main beam 3 can be operated to transversely slide by controlling the oil cylinder, so that the outer dies 9 are close to or far away from each other, die assembly is carried out after close attachment, and die stripping is carried out after far separation.
In order to guarantee the braking when moving the die carrier via hole, the both sides of two adjacent pier studs 1 are provided with respectively and support the steelframe 10, in this embodiment, support steelframe 10 quantity be four, lay respectively in the left and right sides of two adjacent pier studs 1.
Each supporting steel frame 10 is provided with a winch 11, a multi-time steel wire rope 12 is arranged between the front portion of each winch 11 and the rear portion of the movable formwork to be connected, each multi-time steel wire rope 12 comprises a pulley block and a steel wire rope wound on the pulley block, and the movable formwork is well controlled by the aid of the labor-saving characteristic of the pulley block.
When the multiple-rate steel wire ropes 12 are connected, two multiple-rate steel wire ropes 12 on one pier stud 1 are connected with two hanging beams 8 at the rear end of the main beam 3, and two multiple-rate steel wire ropes 12 on an adjacent pier stud 1 are connected with two sides of the front end of the main beam 3.
In this embodiment, the winding machine 11 is further provided with a tension and speed limiter for limiting the tension load of the multi-rate steel wire rope 12 and the moving speed of the movable formwork, and once the tension load exceeds a predetermined limit, the moving formwork needs to be stopped in time to move forward, and the moving formwork can continue to move forward after the rope is released.
And a diagonal draw anchor rod 20 is arranged between the front supporting leg 4 and the front pier stud 1 for connection. And a support rod 19 is arranged between the rear support leg 5 and the front beam body 2 backwards to connect and anchor. According to actual needs of a field, a chain block 13 is further arranged between the backward part of the front supporting leg 4 and the front beam body 2 for connection, so that the stability of the front supporting leg 4 when the movable formwork moves forwards is guaranteed.
In order to realize the antedisplacement of moving die carrier, 4 front sides of preceding landing legs still are provided with and indulge and move hydro-cylinder 14, both sides all are provided with around the back landing leg 5 and indulge and move hydro-cylinder two 15, indulge and move all to be provided with piston shoes 16 on hydro-cylinder one 14 and the indulge hydro-cylinder two 15, piston shoes 16 with girder 3 sliding connection has seted up a plurality of track holes on the girder 3, and piston shoes 16 top is tight in arbitrary track hole to prevent that girder 3 from removing.
The sliding shoes 16 are also provided with a front pin shaft 17 and a rear pin shaft 18 to unlock and lock the main beam 3, namely the sliding shoes 16 are simultaneously provided with the front pin shaft 17 and the rear pin shaft 18, so that the sliding shoes 16 and the main beam 3 can be fixed, namely the sliding shoes 16 and the main beam 3 are locked, and the sliding shoes 16 can be slightly moved to tightly push against the track hole; when only one front pin 17 is installed, the sliding shoe 16 can slide on the main beam 3.
As shown in fig. 5 to 14, a method for braking a through hole of a bridge deck type moving formwork, taking a 30m through hole of a deck type moving formwork as an example, includes the following steps:
step 1: before demolding of the movable mold frame: 1. preceding landing leg 4 is connected fixedly with pier stud 1, and fixed measure is: the front support leg 4 is vertically anchored with the pier by adopting a twisted steel bar; the end part of the upright post of the front supporting leg 4 and the end part of the front beam body 2 are compacted by hard sleepers or section steel. 2. Two chain blocks 13 are adopted between the cross beam of the front supporting leg 4 and the front beam body 2 for tensioning, and the chain blocks 13 can prevent the gravity at the front end of the movable mould frame from being too large in the hole passing process, so that the effect of safe fixation is achieved. 3. Four winches 11 are respectively connected with the front end and the rear end of the movable mould frame through a multi-time steel wire rope 12. 4. The first longitudinal moving oil cylinder 14 on the front supporting leg 4 is disconnected with the sliding shoe 16, and the sliding shoe 16 is temporarily fixed.
And 2, step: normal demoulding of the movable mould frame: and starting the oil cylinder between the cantilever beam 7 and the hanging beam 8, and controlling the outer molds 9 on two sides of the main beam 3 to move outwards and open transversely to avoid the pier stud 1, as shown in fig. 5.
And step 3: the rear leg 5 moves forward: and 3.1, inching the winch 11 and loosening a certain amount of the multi-time-rate steel wire rope 12.
3.2, starting the oil cylinders on the rear auxiliary leg 6 and the front supporting leg 4 to extend out and lift up the movable mould frame, so that the rear supporting leg 5 is in a suspended state when being emptied, and controlling the rear supporting leg 5 to move forwards to the end part of the front beam body 2 after being emptied; and controlling the oil cylinders on the rear auxiliary leg 6 and the front supporting leg 4 to retract and descend the movable die frame, so that the rear supporting leg 5 falls on the beam body 2.
And 3.3, measuring by adopting a level gauge and ensuring the horizontal state of the cross beam of the rear supporting leg 5. And then four support rods 19 are adopted to tighten and anchor the cross beam of the rear support leg 5 and the beam body 2, a foundation bolt is reserved on the previous beam body 2 during anchoring, and the support rods 19 are connected with the foundation bolt so as to be installed on the beam body 2. And meanwhile, four expansion bolts are respectively arranged on the periphery of the rear supporting leg 5 for limiting. The fixing of the rear leg 5 is achieved by the measures of step 3.3, as shown in fig. 6.
And 4, step 4: and (3) installing a second longitudinal moving oil cylinder 15: and longitudinal moving oil cylinders 15 are respectively arranged on the front side and the rear side of the rear supporting leg 5. In an initial state, the two longitudinal moving oil cylinders 15 are respectively in an extending state and a retracting state, as shown in fig. 7, sliding shoes 16 are installed on the longitudinal moving oil cylinders 15, the sliding shoes 16 are connected to the main beam 3 in a sliding mode, and front pin shafts 17 and rear pin shafts 18 are inserted into the sliding shoes 16, as shown in fig. 8; and then controlling the second longitudinal moving oil cylinder 15 to slightly move to enable the sliding shoe 16 to tightly prop against the track hole of the main beam 3, so that the sliding shoe 16 and the main beam 3 are locked, namely after the front pin shaft 17 and the rear pin shaft 18 are inserted, the sliding shoe 16 is locked, so that the sliding shoe 16 can be slightly moved to tightly prop against the track hole, and the main beam 3 is driven to move.
And 5: the movable mould frame moves forwards for the first time: and 5.1, starting the winch 11 and slowly releasing the rope for about 6m to stop.
And 5.2, controlling the two second longitudinal moving oil cylinders 15 to respectively retract and extend to drive the main beam 3 to move forwards by 800mm and stop, as shown in fig. 9. And pulling out the rear pin shaft 18, the unlocking sliding shoes 16 and the main beam 3 on the two sliding shoes 16, controlling the two longitudinal moving oil cylinders 15 to respectively extend and retract to restore to the initial state, and enabling the sliding shoes 16 to slide along with the sliding. And mounting a rear pin shaft 18 and a micro-motion longitudinal moving oil cylinder II 15 to enable the sliding shoe 16 to tightly push against the main beam 3 to lock the sliding shoe 16 and the main beam 3 for moving forwards again.
And 5.3, circularly repeating the step 5.2 until the whole machine moves forwards for 10m, and completing the first hole passing of the movable mould frame, as shown in fig. 10.
In the process of moving the movable mould frame forwards, the front support leg 4 always slides with the main beam 3, so that the front support leg 4 and the main beam 3 are ensured not to be clamped; ensuring that the second longitudinally-moving oil cylinder 15 and the sliding shoe 16 do not interfere with the front supporting leg 4 during the action; and meanwhile, the tension and speed limiter monitors in real time, once the multi-power steel wire rope 12 exceeds the specified load, the second longitudinal moving oil cylinder 15 is stopped in time, and the second longitudinal moving oil cylinder is started continuously and the movable formwork moves forwards continuously after the rope is released.
Step 6: front leg 4 moves forward: 6.1, controlling a winch 11 to tighten the movable mould frame; on the premise of ensuring that the rear supporting leg 5 is anchored with the beam body 2, the fixing structure of the front supporting leg 4 and the pier stud 1 and the chain block 13 are removed, and the front supporting leg 4 is not fixed any more.
Step 6.2, mounting a first longitudinal moving oil cylinder 14 and a sliding shoe 16 on the front supporting leg 4; the oil cylinder of the rear supporting leg 5 is controlled to extend out, the movable die frame is jacked to enable the front supporting leg 4 to be emptied, the front supporting leg 4 is controlled to move forwards to the front pier stud 1 after being emptied, the oil cylinder of the rear supporting leg 5 retracts, and the front supporting leg 4 falls on the front pier stud 1.
Meanwhile, a cable-stayed anchor rod 20 is arranged between the cross beam of the front supporting leg 4 and the pier stud 1; and threaded steel bars are arranged between the front supporting leg 4 upright column and the top of the pier stud 1 for vertical anchoring.
And 7: moving the movable die carrier forward again: and 7.1, in an initial state, the first longitudinally-moving oil cylinder 14 is in a retraction state, a front pin shaft 17 and a rear pin shaft 18 are installed on a sliding shoe 16 on the first longitudinally-moving oil cylinder 14, the first longitudinally-moving oil cylinder 14 slightly pushes the main beam 3 tightly to lock the sliding shoe 16 and the main beam 3, and the second longitudinally-moving oil cylinder 15 is controlled to be in the initial state as shown in fig. 11.
7.2, starting the winch 11, and slowly releasing the rope for about 6m to stop;
and 7.3, controlling the two second longitudinal moving oil cylinders 15 to respectively retract and extend, and synchronously controlling the first longitudinal moving oil cylinders 14 to extend to drive the main beam 3 to move forwards by 1000mm to stop, as shown in fig. 12. And pulling out the rear pin shafts 18 on the three sliding shoes 16, the unlocking sliding shoes 16 and the main beam 3, and controlling the first longitudinal moving oil cylinder 14 and the second longitudinal moving oil cylinder 15 to be in the initial state again. And a rear pin shaft 18, a micro-motion longitudinal moving oil cylinder I14 and a longitudinal moving oil cylinder II 15 are arranged to tightly push the main beam 3 to lock the sliding shoe 16 and the main beam 3 for further forward movement.
And 7.4, circularly repeating the step 7.3, and simultaneously controlling the winch 11 to synchronously release the rope for braking until the whole moving die carrier moves forwards by 18m and stops.
And 8: and (3) detaching a second longitudinal moving oil cylinder 15 and a corresponding sliding shoe 16 which are positioned behind the rear supporting leg 5, dragging, braking and protecting the whole machine by a winch 11, and continuously moving forwards for 2m according to the step 7.3 to move the movable mould frame in place, as shown in fig. 13-14. In the whole moving forward process of the movable mould frame, a leveling instrument is adopted to monitor the front supporting leg 4 and the rear supporting leg 5 cross beams in real time all the time, so that the cross beams are ensured to be in a horizontal state all the time.
And step 9: and starting an oil cylinder between the cantilever beam 7 and the hanging beam 8, and controlling outer molds 9 on two sides of the main beam 3 to move inwards and close transversely to mold for closing so as to build a new beam body 2 again.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (7)
1. A via hole braking system of a bridge upper-support type movable mould frame comprises a plurality of pier columns (1), a beam body (2) erected between adjacent pier columns (1) and the movable mould frame, and is characterized in that the movable mould frame comprises a main beam (3), front support legs (4), rear support legs (5), rear auxiliary legs (6), outriggers (7), hanging beams (8) and an outer mould (9);
the front end of the main beam (3) is provided with the front support leg (4) to abut against the pier stud (1), the rear end of the main beam (3) is respectively provided with the rear support leg (5) and the rear auxiliary leg (6), and the rear support leg (5) and the rear auxiliary leg (6) both abut against the rear beam body (2);
the cantilever beams (7) are uniformly arranged on two sides of the main beam (3), the hanging beam (8) is connected to each cantilever beam (7) in a sliding mode, the outer molds (9) are arranged among the hanging beams (8) on each side of the main beam (3), and the outer molds (9) on two sides of the main beam (3) surround the periphery of the previous beam body (2);
two sides of two adjacent pier studs (1) are respectively provided with a supporting steel frame (10), each supporting steel frame (10) is provided with a winch (11), a multi-time steel wire rope (12) is respectively arranged between each winch (11) and the front and the back of the movable formwork for connection, and the winches (11) are also provided with tension and speed limiters;
and a chain block (13) is arranged between the backward front supporting leg (4) and the front beam body (2) for connection.
2. The bridge deck moving formwork via-hole braking system according to claim 1, wherein the front end of the main beam (3) extends forwards, and the rear end of the main beam (3) spans between two adjacent piers (1);
the cantilever beam (7) is arranged on two sides of the rear end of the main beam (3), the cantilever beam (7) is an inverted trapezoidal steel structure frame, an oil cylinder is arranged between the cantilever beam (7) and the hanging beam (8) to control the die assembly and the die release of the outer dies (9) on two sides, the hanging beam (8) is bent and connected downwards to the outer dies (9), and the outer dies (9) are matched with the outline of the beam body (2).
3. The via hole braking system for the bridge deck type movable formwork according to claim 1, wherein the front support leg (4) and the rear support leg (5) are both in sliding connection with the main beam (3), the front support leg (4) and the rear support leg (5) both comprise an upright column, a cross beam and an oil cylinder for jacking the movable formwork, and the rear auxiliary leg (6) is also provided with an oil cylinder for jacking the movable formwork.
4. The via hole braking system of the bridge deck type movable formwork according to claim 1, wherein a first longitudinally moving oil cylinder (14) is further arranged on the front supporting leg (4), a second longitudinally moving oil cylinder (15) is arranged on each of the front side and the rear side of the rear supporting leg (5), sliding shoes (16) are arranged on the first longitudinally moving oil cylinder (14) and the second longitudinally moving oil cylinder (15), the sliding shoes (16) are in sliding connection with the main beam (3), a plurality of track holes are formed in the main beam (3), the sliding shoes (16) are tightly propped in any track hole, and a front pin shaft (17) and a rear pin shaft (18) are further arranged on the sliding shoes (16) to unlock and lock the main beam (3).
5. The bridge deck moving formwork via hole braking system according to claim 1, wherein a brace rod (19) is arranged between the rear support leg (5) and the front beam body (2) backwards for connection and anchoring; and a cable-stayed anchor rod (20) is arranged between the front supporting leg (4) and the front pier column (1) for connection.
6. The via hole braking system of the bridge deck type moving formwork according to claim 1, wherein the number of the supporting steel frames (10) is four, the supporting steel frames are respectively arranged at the left side and the right side of two adjacent pier columns (1), and the multi-rate steel wire rope (12) comprises a pulley block and a steel wire rope wound on the pulley block;
one of the two multi-rate steel wire ropes (12) on the pier column (1) are connected with the two hanging beams (8) at the rear end of the main beam (3), and the two multi-rate steel wire ropes (12) on the adjacent pier column (1) are connected with the two sides of the front end of the main beam (3).
7. The bridge deck moving formwork via hole braking method of the bridge deck moving formwork via hole braking system according to any one of claims 1 to 6, is characterized by comprising the following steps:
step 1: before demolding of the movable mold frame: the front supporting leg (4) is fixedly connected with the pier stud (1); the beam of the front supporting leg (4) and the front beam body (2) are tensioned by two chain blocks (13); four winches (11) are respectively connected with the front end and the rear end of the movable mould frame through multi-time steel wire ropes (12); a first longitudinally-moving oil cylinder (14) on the front supporting leg (4) is disconnected with the sliding shoe (16), and the sliding shoe (16) is temporarily fixed;
step 2: normal demoulding of the movable mould frame: starting an oil cylinder between the cantilever beam (7) and the hanging beam (8), and controlling outer molds (9) on two sides of the main beam (3) to move outwards and open transversely to avoid the pier stud (1);
and 3, step 3: the rear leg (5) moves forward: the winch (11) is inching, a certain amount of a multi-magnification steel wire rope (12) is loosened, oil cylinders on the rear auxiliary leg (6) and the front supporting leg (4) are started to extend out and lift up the movable die carrier, the rear supporting leg (5) is controlled to move forwards to the end part of the front beam body (2) after being emptied, the oil cylinders on the rear auxiliary leg (6) and the front supporting leg (4) retract, and the rear supporting leg (5) falls on the beam body (2);
measuring the horizontal state of the cross beam of the rear supporting leg (5) by using a level gauge, tensioning and anchoring the cross beam of the rear supporting leg (5) and the beam body (2) by using four support rods (19), and meanwhile, respectively arranging four expansion bolts on the periphery of the rear supporting leg (5) for limiting;
and 4, step 4: and (3) installing a second longitudinal moving oil cylinder (15): longitudinally moving oil cylinders (15) are respectively arranged on the front side and the rear side of the rear supporting leg (5), in an initial state, the two longitudinally moving oil cylinders (15) are respectively in an extending state and a retracting state, sliding shoes (16) are arranged on the longitudinally moving oil cylinders (15), the sliding shoes (16) are connected to the main beam (3) in a sliding mode, front pin shafts (17) and rear pin shafts (18) are inserted into the sliding shoes (16), and then the longitudinally moving oil cylinders (15) are controlled to slightly move so that the sliding shoes (16) tightly support rail holes of the main beam (3), and locking of the sliding shoes (16) and the main beam (3) is achieved;
and 5: the movable mould frame moves forwards for the first time: step 5.1, starting a winch (11), slowly releasing the rope for about 6m, and stopping;
step 5.2, controlling the two longitudinal moving oil cylinders II (15) to retract and extend respectively, and driving the main beam (3) to move forwards by 800mm to stop; pulling out the rear pin shaft (18), the unlocking sliding shoes (16) and the main beam (3) on the two sliding shoes (16), and controlling the two longitudinal moving oil cylinders (15) to respectively extend and retract to return to the initial state; a rear pin shaft (18) and a micro-motion longitudinal movement oil cylinder II (15) are mounted to tightly push the main beam (3) to lock the sliding shoe (16) and the main beam (3) for moving forwards again;
step 5.3, circularly repeating the step 5.2 until the whole machine moves forwards for 10m, and completing the first hole passing of the movable mould frame;
step 6: the front supporting leg (4) moves forwards: controlling a winch (11) to tension the movable mould frame; on the premise of ensuring the stability of the rear supporting leg (5), the fixed structure of the front supporting leg (4) and the pier stud (1) and the chain block (13) are removed; mounting a first longitudinally-moving oil cylinder (14) on a front supporting leg (4) and a sliding shoe (16); controlling an oil cylinder of a rear supporting leg (5) to stretch out and lift up a movable mould frame, controlling a front supporting leg (4) to move forwards to a pier stud (1) in front after being emptied, and installing a cable-stayed anchor rod (20) between a cross beam of the front supporting leg (4) and the pier stud (1);
and 7: moving the movable die carrier forward again: 7.1, in an initial state, the first longitudinally moving oil cylinder (14) is in a retraction state, a front pin shaft (17) and a rear pin shaft (18) are installed on a sliding shoe (16) on the first longitudinally moving oil cylinder (14), the first longitudinally moving oil cylinder (14) is slightly pressed against the main beam (3) to lock the sliding shoe (16) and the main beam (3), and a second longitudinally moving oil cylinder (15) is controlled to be in the initial state;
7.2, starting the winch (11) and slowly releasing the rope for about 6m to stop;
7.3, controlling the two longitudinal moving oil cylinders II (15) to retract and extend respectively, and synchronously controlling the longitudinal moving oil cylinders I (14) to extend to drive the main beam (3) to move forwards by 1000mm to stop; pulling out the rear pin shafts (18), the unlocking sliding shoes (16) and the main beam (3) on the three sliding shoes (16), and controlling the first longitudinally-moving oil cylinder (14) and the second longitudinally-moving oil cylinder (15) to be in an initial state again; a rear pin shaft (18), a micro-motion longitudinal moving oil cylinder I (14) and a longitudinal moving oil cylinder II (15) are mounted to tightly push the main beam (3) to lock the sliding shoe (16) and the main beam (3) for moving forwards again;
7.4, circularly repeating the step 7.3, and simultaneously controlling the winch (11) to synchronously release the rope for braking until the whole machine moves forwards by 18m and stops;
and 8: detaching a second longitudinal moving oil cylinder (15) and a corresponding sliding shoe (16) which are positioned behind the rear supporting leg (5), and continuing to move forwards for 2m according to the step 7.3 to enable the movable mould frame to move in place;
and step 9: and starting an oil cylinder between the cantilever beam (7) and the hanging beam (8), and controlling outer molds (9) on two sides of the main beam (3) to move inwards and transversely close for mold assembly so as to build a new beam body (2) again.
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| CN114525737B (en) | 2023-06-16 |
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