CN111155433A - Method for dismantling movable formwork - Google Patents
Method for dismantling movable formwork Download PDFInfo
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- CN111155433A CN111155433A CN201911418770.7A CN201911418770A CN111155433A CN 111155433 A CN111155433 A CN 111155433A CN 201911418770 A CN201911418770 A CN 201911418770A CN 111155433 A CN111155433 A CN 111155433A
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G19/00—Auxiliary treatment of forms, e.g. dismantling; Cleaning devices
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- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The application relates to the technical field of bridge construction, and provides a method for dismantling a movable formwork of a bridge, which comprises the following steps: removing the template system on the movable mould frame by using a beam crane; carrying out die assembly on die frames on two sides of the bridge pier to form die assembly die frames; installing a downward placing system corresponding to the die closing die frame; the mold closing mold frame is lowered and detached by utilizing the lowering system; the formwork comprises a main beam and a nose bridge which are positioned on two sides of the pier. According to the method for dismantling the movable formwork of the bridge, the dismantling process of the movable formwork can be reduced, and the dismantling complexity is reduced.
Description
[ technical field ] A method for producing a semiconductor device
The application relates to the technical field of bridge construction, in particular to a method for dismantling a movable formwork.
[ background of the invention ]
In the construction of a bridge, the pouring of a box girder is involved, at present, the pouring of the box girder mostly uses the building of a movable formwork, and the pouring of the bridge is carried out section by section on the movable formwork. And after the pouring is finished, the movable formwork is dismantled.
In the technology of removing the movable formwork, a hoisting method is mostly used to remove the movable formwork, the movable member and the fixed member. However, the existing mobile formwork dismantling technology uses hoisting equipment to dismantle each part section by section and to adjust away from the bridge. At that time, such a hoisting method requires a large time and cost, and increases the complexity of the dismantling process.
[ summary of the invention ]
In order to overcome the technical problems, in particular to the problems of time cost draft and complex dismantling process of the dismantling method of the movable mould frame, the following technical scheme is proposed:
the application provides a method for dismantling a movable formwork, which comprises the following steps:
removing the template system on the movable mould frame by using a beam crane;
carrying out die assembly on die frames on two sides of the bridge pier to form die assembly die frames;
installing a downward placing system corresponding to the die closing die frame;
the mold closing mold frame is lowered and detached by utilizing the lowering system;
the formwork comprises a main beam and a nose bridge which are positioned on two sides of the pier.
In one embodiment, the step of closing the die sets on the two sides of the pier to form a closed die set includes:
and moving the main beams and the nose bridges on two sides of the pier towards the pier along the erection direction of the bracket beam, fixedly connecting the flower shelf beams on the inner sides of the main beams, and carrying out die assembly on the die frames on two sides of the pier to form a die assembly die frame.
In one embodiment, before the step of closing the die sets on both sides of the pier, the method further includes:
and retreating the die carriers on the left side and the right side of the bridge pier by a set distance.
In one embodiment, the step of installing a downward-placing system corresponding to the mold clamping mold frame includes:
a middle cross beam and a rear cross beam above the die assembly die frame are respectively used as a middle hoisting carrying pole and a rear hoisting carrying pole, and are respectively anchored with box girders at corresponding positions by steel ropes;
respectively reinforcing the main beam, the middle hoisting carrying pole and the rear hoisting carrying pole;
it is right respectively well hoist and mount shoulder pole and back hanging beam shoulder pole transfer the installation of system, wherein, transfer the system including respectively with well hoist and mount shoulder pole and back hanging beam shoulder pole correspond the setting, it is in including setting up well hoist and mount shoulder pole and the jack of back hanging beam shoulder pole below, with jack control connection's pump station, right the jacking position of well hoist and mount shoulder pole and back hanging beam shoulder pole carries out the sensor of sensor to and controlling means.
In one embodiment, the step of removing the formwork system on the movable formwork by using a beam crane comprises the following steps:
setting a preformed hole at the position of the beam plate corresponding to the cross beam, and arranging a winch at the position of the beam plate corresponding to the preformed hole;
partitioning the side plates, the bottom plate, the balancing weight and the upper cross beam on the left side and the right side of the transverse bridge;
dismantling the side plates, the bottom plate, the balancing weights and the upper cross beam of each template system in sections by using a winch arranged on the beam plate;
the template system comprises an upper cross beam, side plates, a bottom plate and a balancing weight arranged on the upper cross beam.
In one embodiment, the step of lowering and removing the matched mold frame by using the lowering system includes:
synchronously jacking the middle hoisting carrying pole and the rear hoisting beam carrying pole to a set height by using the jack, and moving the bracket component to be separated from the pier;
after the die closing die frame and the bracket component are lowered to a set height, the bracket component is dismantled; wherein the bracket member comprises a bracket, a bracket diagonal brace and an insert block;
and (4) the whole jack is dropped to the longitudinal moving platform, and the die carrier is dismantled.
In one embodiment, the step of moving the corbel member away from the pier comprises:
moving the bracket out of the bracket hole by the trolley transverse moving jack;
and (4) disassembling the bracket inclined strut and the inserting block by using a crane.
In one embodiment, the step of removing the formwork includes:
fixing the bracket beam, and removing the cross beam of the flower stand;
starting a trolley longitudinal movement jack, pushing a main beam towards the tail direction of the die carrier, and dismantling the main beam section by section;
integrally hoisting the hoisting beam;
and removing the main beam and the nose bridge.
In one embodiment, before the step of removing the formwork system on the moving formwork by using the beam crane, the method further includes:
dismantling the front hanging beam and the pad beam;
the front hanging beam is a box girder section which is poured by the box girder.
In one embodiment, before the step of detaching the front suspension beam and the suspension rod, the method further includes:
installing front, middle and rear hanging beam supports and hanging rods, and slightly dropping the die frame to complete system conversion;
respectively spanning the front bracket beam and the rear bracket beam to the next pier position;
and (4) after jacking the die carrier, removing the hanging beam jacking support and the hanging rod, and performing die drop and secondary system conversion.
According to the method for dismantling the movable formwork, the main beams and the nose bridges on the two sides of the bridge pier are fixedly connected to form the die assembly formwork, and then the die assembly formwork is integrally placed and dismantled, so that the dismantling process of the movable formwork is reduced, and the dismantling complexity is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
[ description of the drawings ]
Fig. 1 is a schematic view of a moving mold frame according to the present application;
fig. 2 is a schematic flow chart illustrating a demolition method of a moving formwork in an embodiment of the present application;
FIG. 3 is a detailed flowchart of step S110 of the present application;
FIG. 4 is a detailed flowchart of step S130 of the present application;
FIG. 5 is a detailed flowchart of step S140 of the present application;
fig. 6 is a schematic flow chart illustrating a method for removing a moving formwork according to another embodiment of the present disclosure.
[ detailed description ] embodiments
The present application is further described with reference to the following drawings and exemplary embodiments, wherein like reference numerals are used to refer to like elements throughout. In addition, if a detailed description of the known art is not necessary to show the features of the present application, it is omitted.
Referring to fig. 1, fig. 1 is a schematic structural view of a moving mold frame according to the present application. And fixing bracket members 10 in the middle parts of two sides of the pier, and arranging bracket beams 20 on the bracket members 10 along the transverse bridge direction and vertical to the pier. A trolley 30 is erected along the corbel beam 20. The trolley 30 is also slidable along the lower surface of the main beam 40. The flower shelf cross member 50 is provided on the side of the main beam 40 close to the bridge pier, and the mold can be closed by the flower shelf cross member 50. An upper cross beam 70 is provided above the main beams 40, and the upper cross beam 70 is substantially level with the top surface of the pier. A screw top 60 may be provided for connection between the main beam 40 and the upper beam 70. The bridge of the nose is connected along one side of the main beam 40 close to the box girder to be poured. The girders 40 and the bridge bridges on both sides of the pier constitute a movable formwork. And a template system 80 is erected above the bridge section. The formwork system 80 is used for casting the box girder.
Referring to the structure of the moving formwork in fig. 1, the present application provides a method of removing the moving formwork. Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a method for removing a mobile formwork according to an embodiment of the present application.
S110, removing the template system 80 on the movable formwork by using a beam crane;
s120, mold closing is carried out on mold bases on two sides of the bridge pier to form mold closing mold bases;
s130, installing a downward placing system corresponding to the die closing die frame;
s140, lowering and detaching the die closing die frame by using the lowering system;
wherein, the die carrier is including girder 40 and the bridge of the bridge that is located pier both sides.
In steps S110 to S140, after the construction of the last span box girder is completed, the middle and rear hanging girders are removed by the girder crane, then the formwork system 80 is opened, and the parts of the formwork system 80, the screw top 60 connected between the formwork system 80 and the girder 40, part of the flower shelf beams 50 are removed by the girder crane, and the flower shelf beams 50 respectively located at the front, middle and rear sections of the girder 40 are retained for correspondingly and fixedly connecting the girders 40 and the bridge of the bridge on both sides of the pier, and performing mold closing. When the die assembly is completed and the die assembly die frame is formed, the beam on the box girder is provided with the lowering system, and the lowering system is connected with the die assembly die frame and used for removing the die assembly die frame after the die assembly die frame is lowered to a stable position, so that the removal of the movable die frame is completed.
According to the method for dismantling the movable formwork, the main beams 40 on the two sides of the pier and the nose bridge are fixedly connected to form the die assembly formwork, and then the die assembly formwork is integrally placed and dismantled, so that the dismantling process of the movable formwork is reduced, and the dismantling complexity is reduced.
In this embodiment, the formwork system 80 includes an upper beam 70, side plates 81, a bottom plate 83, and a weight 84 mounted to the upper beam 70.
Referring to fig. 3, fig. 3 is a detailed flowchart of step S110 in the present application.
The step S110 may further include:
s111, setting a preformed hole in the position, corresponding to the beam, of the beam plate, and arranging a winch in the position, corresponding to the beam plate of the preformed hole;
s112, partitioning the side plates 81, the bottom plate 83, the balancing weight 84 and the upper cross beam 70 on the left side and the right side of the transverse bridge;
and S113, utilizing a winch arranged on the beam plate to dismantle the side plate 81, the bottom plate 83, the counterweight block 84 and the upper cross beam 70 of each template system 80 in a segmented manner.
In the process of steps S111 to S113, in this embodiment, 3 segments of the side plate 81 of the formwork system 80 are distributed along the transverse bridge direction, and the bottom plate 83 is used as one segment, and the side plate 81 and the bottom plate 83 are removed in segments. The construction is symmetrically carried out on the left side and the right side during the dismounting, and the dismounting on the same side is required to be carried out according to the sequence of the side plate 81, the bottom plate 83, the balancing weight 84 and the cross beam; when the last case roof beam of striding is under construction before demolising, need set up the preformed hole in the beam slab corresponds the crossbeam position to hoist engine steel cable penetrates and draws. In preparation for removing the formwork system 80, the traction winch is welded and fixed to the deck embedded channel steel.
In the present embodiment, the removal of the side plate 81 and the bottom plate 83 includes: when the first section of the formwork of the first section is dismantled, the formwork is taken out from the end of the tail part of the formwork, then the two sections of the rear side plates 81 are dismantled in sequence, and during subsequent dismantling, the formwork is hoisted at the gap of the dismantled section. When the flange plate is dismantled, the flange plate supporting rods retract firstly, then pins connected with the formwork main beam 40 are removed, the flange plate supporting rods are controlled manually to enable the flange plate to descend and fold slowly, the steel wire ropes and the sliding ropes are bound manually, and the sliding ropes are matched with a crane to be hoisted to the bridge floor. When the bottom plate 83 is detached, the body needs to be rotated by means of the cooperation of the traction of the winch and the sliding rope, and the body can be taken out after the rotation is completed. The winch is fixed on the beam surface, the traction bottom plate 83 rotates through folding and unfolding until the thickness direction of the plate surface faces the gap position of the left flange plate and the right flange plate, the plate surface is hoisted and taken out by the crane, the plate surface is hoisted by adopting two-point symmetrical hoisting of cutting holes, the hoisting members are required to be provided with sliding ropes, and the members are guaranteed to be hoisted to the bridge floor smoothly. In addition, the half-and-half steel pipes are required to be embedded at the contact position of the steel wire rope of the winch and the edge of the box girder or the folded angle of the embedded hole, so that the steel wire rope is prevented from being damaged by the folded angle.
For step S120, the method further includes: and moving the main beams 40 and the bridge bridges on two sides of the pier towards the pier direction along the erection direction of the bracket beams 20, fixedly connecting the flower shelf cross beams 50 on the inner sides of the main beams 40, and carrying out die assembly on die frames on two sides of the pier to form die assembly die frames.
In this embodiment, the trolley 30 is provided with a traversing jack below. After the template system 80 is completely dismantled, the mold frame is closed by transversely moving the jacks of the starting trolley 30, and the reserved 6 groups of flower frame cross beams 50 are connected, so that the left and right main nose bridges of the mold frame form a whole, then the middle and rear cross beams are aligned to the hoisting holes to be in place, the level of the cross beams is strictly controlled through the leveling ruler, and the downward placing system is installed.
Referring to fig. 4, fig. 4 is a detailed flowchart of step S130 in the present application.
On this basis, for step S130, the method may further include:
s131, respectively taking a middle cross beam and a rear cross beam above the die closing die frame as a middle hoisting carrying pole and a rear hoisting carrying pole, and respectively anchoring the middle cross beam and the rear cross beam with box girders at corresponding positions by adopting steel ropes;
s132, respectively reinforcing the main beam 40 and the middle hoisting carrying pole and the rear hoisting carrying pole;
and S133, respectively installing the middle hoisting carrying pole and the rear hoisting beam carrying pole in a lowering system.
The lowering system comprises a jack, a pump station, a sensor and a control device, wherein the jack is arranged below the middle hoisting carrying pole and the rear hoisting beam carrying pole, the pump station is connected with the jack in a control mode, the sensor is used for sensing the jacking positions of the middle hoisting carrying pole and the rear hoisting beam carrying pole, and the control device is used for controlling the setting of the middle hoisting carrying pole and the rear hoisting beam carrying pole.
In the process of the steps S131-S133, after the middle hoisting carrying pole and the rear hoisting beam carrying pole are in place and adjusted to be horizontal, the method adopts
Finish rolling the deformed steel bar to anchor the deformed steel bar and the box girder, embedding the anchoring rib part at the construction time of the box girder by the embedding depth of 1m, and lengthening the deformed steel bar by using an extender; and the part is anchored with the box girder top plate through a reserved hole.
Utilize the steel sheet to consolidate main girder 40 respectively with well hoist and mount shoulder pole and back hanging beam shoulder pole, avoid in the below in-process, main girder 40 with well hoist and mount shoulder pole and back hanging beam shoulder pole cause the damage.
And after the main beam 40, the middle hoisting carrying pole and the rear hoisting carrying pole are reinforced and installed in place, the installation of the lowering system is started. In this embodiment, the lowering system includes 8 hydraulic jacks of 200t, and the middle hoisting carrying pole and the rear hanging beam carrying pole are respectively configured with 4, and are respectively controlled by a pump station. The sensor comprises an oil cylinder sensor and an anchorage sensor. The above components are also electrically connected with a control device respectively to cooperatively control each part.
Referring to fig. 5, fig. 5 is a detailed flowchart of step S140 of the present application.
On this basis, for step S140, the method may further include:
s141, synchronously jacking the middle hoisting carrying pole and the rear hoisting beam carrying pole to a set height by using the jack, and moving the corbel member 10 to be separated from the pier;
s142, after the mold closing mold frame and the bracket member 10 are lowered to a set height, the bracket member 10 is disassembled;
and S143, the jack is used for integrally falling to the longitudinal moving platform, and the die closing die frame is detached.
Wherein, the bracket member 10 comprises a bracket 11, a bracket 11 inclined strut 12 and an insert block 13.
In a specific place, after the lowering system is installed, trial operation is carried out, after acceptance is passed, the jack is lowered and synchronously jacked for 5cm, the trolley 30 is started to transversely move the oil cylinder, the bracket 11 is transversely moved out of a preformed hole of a pier, the inserting blocks 13 of the bracket 11 and the inclined struts 12 of the bracket 11 are detached piece by piece, and two sides are symmetrically constructed during detachment.
The step of moving the corbel member 10 away from the pier in step S141 may include:
s1, moving the bracket 11 out of the bracket hole by transversely moving the jack through the trolley 30;
and S2, removing the inclined strut 12 and the insert block 13 of the bracket 11 by using a crane.
The step of removing the mold clamping frame in step S143 may include:
s11, fixing the bracket beam 20 and releasing the flower stand beam 50;
s12, starting the trolley 30 to longitudinally move the jack, pushing the main beam 40 towards the tail direction of the die closing die set, and removing the main beam 40 section by section;
and S13, integrally hoisting the nose bridge.
In the process of steps S11-S13, after the main bridge of the nose is lowered in place, the corbel bar 20 is fixed and the flower shelf cross-member 50 is released. And starting the trolley 30 to longitudinally move the jack along the main beam 40, pushing the main beam 40 towards the tail part direction of the die assembly die carrier, pushing out a section of main beam 40 on each top, immediately adopting profile steel to temporarily support the pad, then utilizing a floating crane to firstly carry in place, then adopting an air blasting machine to remove connecting bolts among the nodes according to the sequence of top and bottom webs, finally lifting away from the main beam 40, still adopting lifting points during assembling during lifting, and carrying out four-point lifting at two ends. After the main girder 40 is lifted, the main girder 40 is lifted to the main trestle for loading through the longitudinal and transverse movement of the anchor chain of the floating crane, and the front four sections of the main girders 40 are sequentially removed according to the method.
After the last section girder 40 is dismantled, the bridge of the nose is hoisted integrally, the hoisting point is arranged at the three-branch point, the steel rope penetrates through the intersection of the upper chord diagonal bracing of the bridge of the nose, and then the steel rope falls to the trestle for dismantling and loading through the traction of the sliding rope, and then the trolley 30 and the bracket girder 20 are disassembled.
Referring to fig. 6, fig. 6 is a schematic flow chart illustrating a demolition method of a mobile formwork according to another embodiment of the present application.
Before step S110, the method further includes:
s1101, dismantling the front hanging beam and the pad beam. The front hanging beam is a box girder section which is poured by the box girder.
Further, before step S1101, the method further includes:
s1011, installing a front, middle and rear hanging beam top support and a hanging rod, and slightly dropping the die frame to complete system conversion;
s1012, respectively spanning the front and rear bracket beams 20 and the bracket members 10 to the next pier position;
and S1013, after the die carrier is jacked, the hanging beam jacking support and the hanging rod are detached, the die is dropped, and the second system conversion is carried out.
Although a few exemplary embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these exemplary embodiments without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.
Claims (10)
1. A method for dismantling a movable formwork of a bridge is characterized by comprising the following steps:
removing the template system on the movable mould frame by using a beam crane;
carrying out die assembly on die frames on two sides of the bridge pier to form die assembly die frames;
installing a downward placing system corresponding to the die closing die frame;
the mold closing mold frame is lowered and detached by utilizing the lowering system;
the formwork comprises a main beam and a nose bridge which are positioned on two sides of the pier.
2. The demolition method of a moving formwork of a bridge according to claim 1,
the step of carrying out the compound die to the die carrier of pier both sides, formation compound die carrier includes:
and moving the main beams and the nose bridges on two sides of the pier towards the pier along the erection direction of the bracket beam, fixedly connecting the flower shelf beams on the inner sides of the main beams, and carrying out die assembly on the die frames on two sides of the pier to form a die assembly die frame.
3. The demolition method of a moving formwork of a bridge according to claim 2,
before the step of carrying out the compound die to the die carrier of pier both sides, still include:
and retreating the die carriers on the left side and the right side of the bridge pier by a set distance.
4. The demolition method of a moving formwork of a bridge according to claim 2,
the step of installing the lowering system comprises:
a middle cross beam and a rear cross beam above the die assembly die frame are respectively used as a middle hoisting carrying pole and a rear hoisting carrying pole, and are respectively anchored with box girders at corresponding positions by steel ropes;
respectively reinforcing the main beam, the middle hoisting carrying pole and the rear hoisting carrying pole;
it is right respectively well hoist and mount shoulder pole and back hanging beam shoulder pole transfer the installation of system, wherein, transfer the system including respectively with well hoist and mount shoulder pole and back hanging beam shoulder pole correspond the setting, it is in including setting up well hoist and mount shoulder pole and the jack of back hanging beam shoulder pole below, with jack control connection's pump station, right the jacking position of well hoist and mount shoulder pole and back hanging beam shoulder pole carries out the sensor of sensing to and controlling means.
5. The demolition method of a moving formwork of a bridge according to claim 1,
the method comprises the following steps of dismantling a template system on the movable formwork by using a beam surface crane, wherein the method comprises the following steps:
setting a preformed hole at the position of the beam plate corresponding to the cross beam, and arranging a winch at the position of the beam plate corresponding to the preformed hole;
partitioning the side plates, the bottom plate, the balancing weight and the upper cross beam on the left side and the right side of the transverse bridge;
dismantling the side plates, the bottom plate, the balancing weights and the upper cross beam of each template system in sections by using a winch arranged on the beam plate;
the template system comprises an upper cross beam, side plates, a bottom plate and a balancing weight arranged on the upper cross beam.
6. The demolition method of a moving formwork of a bridge according to claim 4,
the step of using the lowering system to lower and remove the die closing die frame comprises the following steps:
synchronously jacking the middle hoisting carrying pole and the rear hoisting beam carrying pole to a set height by using the jack, and moving the bracket component to be separated from the pier;
after the die closing die frame and the bracket component are lowered to a set height, the bracket component is dismantled;
the jack is used for integrally falling to the longitudinal moving platform, and the die closing die frame is disassembled;
wherein, the bracket component comprises a bracket, a bracket inclined strut and an inserting block.
7. The demolition method of a moving formwork of a bridge according to claim 6,
the step of moving the corbel member away from the pier comprises:
moving the bracket out of the bracket hole by the trolley transverse moving jack;
and (4) disassembling the bracket inclined strut and the inserting block by using a crane.
8. The demolition method of a moving formwork of a bridge according to claim 6,
the step of removing the die closing die frame comprises the following steps:
fixing the bracket beam, and removing the cross beam of the flower stand;
starting a trolley longitudinal movement jack, pushing a main beam towards the tail direction of the die assembly die carrier, and dismantling the main beam section by section;
and integrally hoisting the nose bridge.
9. The method for dismantling the movable formwork of a bridge according to claim 1, wherein:
before the step of utilizing the beam face crane to demolish the template system on the movable formwork, the method further comprises the following steps:
dismantling the front hanging beam and the pad beam;
the front hanging beam is a box girder section which is poured by the box girder.
10. The method for dismantling the movable formwork of a bridge according to claim 9, wherein:
before the step of dismantling preceding hanging beam and jib, still include:
installing front, middle and rear hanging beam supports and hanging rods, and slightly dropping the die frame to complete system conversion;
respectively spanning the front bracket beam and the rear bracket beam to the next pier position;
and (4) after jacking the die carrier, removing the hanging beam jacking support and the hanging rod, and performing die drop and secondary system conversion.
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| CN201911418770.7A CN111155433A (en) | 2019-12-31 | 2019-12-31 | Method for dismantling movable formwork |
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| CN201911418770.7A CN111155433A (en) | 2019-12-31 | 2019-12-31 | Method for dismantling movable formwork |
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|---|---|---|---|---|
| CN113152287A (en) * | 2021-03-19 | 2021-07-23 | 中铁大桥局集团第一工程有限公司 | Descending type movable formwork dismantling method and device |
| CN113152287B (en) * | 2021-03-19 | 2022-12-27 | 中铁大桥局集团第一工程有限公司 | Descending type movable formwork dismantling method and device |
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