CN114319110B - Construction method for integrally lowering large-tonnage movable formwork - Google Patents
Construction method for integrally lowering large-tonnage movable formwork Download PDFInfo
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- CN114319110B CN114319110B CN202111456341.6A CN202111456341A CN114319110B CN 114319110 B CN114319110 B CN 114319110B CN 202111456341 A CN202111456341 A CN 202111456341A CN 114319110 B CN114319110 B CN 114319110B
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Abstract
The invention relates to a construction method for integrally lowering a large-tonnage movable formwork, which comprises the following construction steps: a, building a temporary assembly platform; b, installing a lowering system, erecting a plurality of temporary buttresses between the second pier and the fourth pier, assembling a movable formwork on the temporary buttresses by adopting a pushing method, and connecting the cross beam, the movable formwork and the formwork into a working platform; c, integrally lifting; d, integrally lowering; and e, downloading and calculating. According to the invention, the problem that the whole large-tonnage movable die frame cannot be under due to the influence of large-tonnage hoisting and tidal water in a sea area is solved by improving an assembly site and adopting the whole lowering system, and in addition, under the condition that the operation surface is very narrow, the whole lower part of the large-tonnage movable die frame is realized by pushing operation, the assembly period is shortened, the construction is simple, and the safety is high.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for integrally lowering a large-tonnage movable formwork.
Background
At present, the large-tonnage movable formwork is basically assembled in situ on site, is interfered by tidal water in shallow sea areas, and cannot adopt the whole hoisting and lowering process of offshore and on-site steel trestle, so that the construction cannot be completed. Especially, aiming at the condition that the working surface of the working site is very narrow, for example, the working site of a movable formwork is spanned by 57 meters in a small-trunk-long-face-confrontation channel project, the low tide time is shorter, the influence of tide is large, the assembly progress of the movable formwork is considered, the potential safety hazard is eliminated, and the assembly construction process is optimized essentially, so that the assembly progress of construction and the safety control are improved effectively.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a construction method for integrally lowering a large-tonnage movable formwork.
The invention adopts the following technical scheme to realize the aim: the construction method for integrally lowering the large-tonnage movable formwork comprises the following construction steps:
a building temporary assembly platform
Setting up two groups of bridge pier combinations for splicing along the direction of a secondary trestle, wherein each group of bridge pier combination comprises a first bridge pier, a second bridge pier, a third bridge pier and a fourth bridge pier which are distributed along the direction of a main trestle, a plurality of fifth bridge piers are arranged below the secondary trestle, the fifth bridge piers are used for supporting the secondary trestle, cattle leg beams are arranged on the first bridge piers and the second bridge piers, a platform is set up between the fourth bridge piers and the fifth bridge piers, the platform is used as a main splicing platform, a plurality of temporary support piers are set up between the second bridge piers and the fourth bridge piers, a movable formwork is spliced on the temporary support piers by adopting a pushing method, a plurality of cross beams and templates are arranged on the main trestle by 80-ton crawler crane, the cross beams are arranged on the movable formwork, the cross beams are parallel to the direction of the secondary trestle, the cross beams and the movable formwork are used for supporting the templates, and the cross beams, the movable formwork and the movable formwork are connected into a working platform;
b installation lowering system
Adopting 4-point synchronous lowering, arranging a lowering frame on the bracket beams of the first pier and the second pier respectively, and realizing the lifting of the working platform through the cooperation of the lowering frame, the sling and the jack;
c integral lifting
Before the movable die frame is lowered, the movable die frame is integrally lifted for 0.05m and is held for a period of time, whether deformation occurs to each structural member and the connecting position or not is observed, whether the extending height of the jack is retracted or not is observed, and a temporary buttress under the movable die frame can be removed after all the lifting jacks are normal;
d integrally lowering
When the movable die frame is lowered, 4 bearing points should lift the jack at the same time, and return oil is returned to lower the jack, so that the whole movable die frame is stressed in a balanced manner and lowered horizontally, and special persons should be allowed to observe the hanging points and the system below the connection in a side-by-side manner in the process of lowering the movable die frame so as to prevent accidents;
e drop-down calculation
(1) Load under
The lowering load comprises the dead weight of the movable mould frame and is 520 tons in total;
front lifting point stress: f (F) 1 =280 tons; and (5) stress on the rear hanging point: f (F) 2 =240 tons;
beret beam calculation
The two sides of the upper layer of the Bailey beams are provided with single-layer Bailey beams,
maximum bending moment:
maximum shear force: t=1400 kN;
the lowering frames are provided with 6 rows of bailey beams, the lowering load is evenly distributed to the 6 rows of bailey beams through the shoulder pole beams, the maximum bending moment of a single row of bailey beams is 486.73 KN.m, and the maximum shearing force is 233.33kN;
the Bailey beam allows a bending moment of 788.2 KN.m and allows a shearing force of 245kN, so that the use requirement is met;
(2) stress calculation of jack and sling
2 jacks of 400t are transversely arranged at the front and rear suspension points respectively, and the minimum breaking force of the lowering suspension cable is 26.07 tons, and 22 jacks are arranged in each beam;
jack reserve factor:
lowering the hoist rope reserve coefficient:
according to the technical specification of integral lifting of heavy structural equipment DG/TJ08-2056-2009, 7.1.3 prescribes that the total rated load of all lifting cylinders of the total lifting capacity should not be less than 1.25 times of the standard value of the total lifting load, and 7.1.2 prescribes that the design value of the tension of a single steel strand in the lifting cylinders should not exceed 50% of the breaking tension of the single steel strand, so that the reserve coefficient of the lifting capacity and the safety coefficient of the steel strand completely meet the requirements of the lifting working condition of a large-scale member.
In particular, the movable mould frame comprises two supporting mechanisms, wherein each supporting mechanism comprises a plurality of sections of front nose bridges which are detachably connected together, a plurality of sections of main bridges which are detachably connected together and a plurality of sections of rear nose bridges which are detachably connected together, and the front nose bridges and the rear nose bridges are connected together through the main bridges.
In particular, a propulsion power mechanism is arranged on the assembly platform and is used for realizing the movement of the assembly movable die frame supporting mechanism, and each time a section of front nose bridge, a main beam or a rear nose bridge is arranged, the propulsion power mechanism advances a section of distance in the direction away from the sub-trestle, so that the installation of the front nose bridge, the main beam or the rear nose bridge of the next section of the assembly platform is facilitated, and the propulsion power mechanism pushes the front nose bridge, the main beam and the rear nose bridge to be installed section by section.
In particular, the propulsion power mechanism is one of an air cylinder, an electric cylinder and a hydraulic cylinder.
In particular, the elevation of the lower flange plate of the main beam of the movable formwork is positioned below the elevation of the water surface at the high tide level, so that the assembly elevation of the movable formwork is improved to be above the elevation of the water surface at the high tide level for improving the construction efficiency, the main beam, the front nose bridge and the rear nose bridge are longitudinally moved in place, and the cross beam is integrally lowered to the construction elevation after assembly.
In particular, the cross beam is located between the main beams of the two supporting mechanisms, and the end of the cross beam is connected with the main beams, and the cross beam is used for bearing construction loads transmitted by the templates.
In particular, a plurality of screw jacks are arranged on the top surface of the cross beam and are connected with the template, and the pre-camber of the template is adjusted by adjusting the heights of the screw jacks.
In particular, the lower frame is provided with an upper hanging point, the main beam is provided with a lower hanging point, and the diameter of the main beam is 1860 grade15.24 steel stranded wires are used as slings, each point adopts 1 jack of 400t as power, the movable mould frame is lowered onto the bracket beam through periodic action of the jack, the jack is positioned on the top surface of the lowering frame, the jack can move along the length direction of the lowering frame, and the length direction is parallel to the sub-trestle;
particularly, the movable die carrier lowers the height: the front hanging point is 1.35m, and the rear hanging point is 2.75m.
In particular, the temporary buttress is a steel pipe pile.
The beneficial effects of the invention are as follows: according to the invention, the problem that the whole large-tonnage movable die frame cannot be under due to the influence of large-tonnage hoisting and tidal water in a sea area is solved by improving an assembly site and adopting the whole lowering system, and in addition, under the condition that the operation surface is very narrow, the whole lower part of the large-tonnage movable die frame is realized by pushing operation, the assembly period is shortened, the construction is simple, and the safety is high.
Drawings
FIG. 1 is a schematic diagram of a structure after the movable mold frame is installed;
fig. 2 is a schematic distribution diagram of bridge pier combinations;
FIG. 3 is a schematic structural view of a movable mold frame;
FIG. 4 is a schematic illustration of the connection of the drop down rack to the bracket beam;
FIG. 5 is a schematic illustration of the connection of the cross beam to the main beam;
FIG. 6 is a schematic view of a hanging point longitudinal arrangement;
FIG. 7 is a schematic illustration of the connection of the jack to the main beam;
FIG. 8 is a diagram of a process of installing a movable mold frame;
FIG. 9 is a second diagram of the process of installing the movable mold frame;
FIG. 10 is a third diagram of the process of installing the movable mold frame;
FIG. 11 is a diagram of a moving mold frame installation process;
FIG. 12 is a diagram of a process of installing a movable mold frame;
FIG. 13 is a diagram six of a moving mold frame installation process;
in the figure: 1-sub trestle; 2-a main trestle; 3-pier number one; 4-second pier; pier 5-III; pier 6-fourth; 7-fifth pier; 8-corbel beams; 9-moving the die carrier; 91-front nose bridge; 92-girder; 93-the rear nose bridge; 10-an assembly platform; 11-temporary buttresses; 12-a cross beam; 13-lowering the rack; 14-slings; 15-jack; 16-screw jack;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 13, a construction method for integrally lowering a large-tonnage movable formwork comprises the following construction steps:
a building temporary assembly platform
Two groups of pier combinations for splicing are built along the direction of a secondary trestle 1, each group of pier combinations comprises a first pier 3, a second pier 4, a third pier 5 and a fourth pier 6 which are distributed along the direction of a main trestle 2, a plurality of fifth piers 7 are arranged below the secondary trestle 1, the fifth piers 7 are used for supporting the secondary trestle 1, bracket beams 8 are arranged on the first piers 3 and the second piers 4, a platform is built between the fourth piers 6 and the fifth piers 7, the platform serves as a main splicing platform 10, a plurality of temporary piers 11 are built between the second piers 4 and the fourth piers 6, the temporary piers 11 are steel pipe piles, a movable die carrier 9 is spliced on the temporary piers 11 by adopting a pushing method, a plurality of cross beams 12 and templates are arranged on the main trestle 2 by 80-ton crawler crane, the cross beams 12 are arranged on the movable die carrier 9, the cross beams 12 are parallel to the direction of the secondary trestle 1, the cross beams 12 and the movable die carrier 9 are used for supporting templates, and the cross beams 12, the movable die carrier 9 and the templates are connected to form a working platform;
the movable mould frame 9 comprises two supporting mechanisms, wherein each supporting mechanism comprises a plurality of sections of front nose bridges 91 which are detachably connected together, a plurality of sections of main bridges 92 which are detachably connected together and a plurality of sections of rear nose bridges 93 which are detachably connected together, and the front nose bridges 91 and the rear nose bridges 93 are connected together through the main bridges 92.
The assembly platform 10 is provided with a propulsion power mechanism, the propulsion power mechanism is used for realizing the movement of the support mechanism of the assembly movable mould frame 9, and each time a section of front nose bridge 91, a main beam 92 or a rear nose bridge 93 is installed, the propulsion power mechanism propels a section of distance away from the direction of the sub-trestle 1, the installation of the front nose bridge 91, the main beam 92 or the rear nose bridge 93 of the next section is facilitated, and the propulsion power mechanism thrusts the front nose bridge 91, the main beam 92 and the rear nose bridge 93 to be installed section by section. The installation process of the movable die carrier 9 is as follows:
(1) the crawler crane positioned on the sub-trestle 1 lifts the front nose bridge 91 onto the assembly platform 10, as shown in fig. 8, the front nose bridge 91 is pushed away from the sub-trestle 1 by the pushing power mechanism, then the next nose bridge 91 is lifted onto the assembly platform 10, the next nose bridge 91 is connected with the pushed front nose bridge 91, as shown in fig. 9, if the multiple sections of front nose bridges 91 are installed, the actions are installed;
(2) the front nose bridge 91 after installation is pushed away from the sub-trestle 1 by a pushing power mechanism, the main beam 92 is lifted to the assembly platform 10, the main beam 92 is connected with the front nose bridge 91 close to the sub-trestle 1, as shown in fig. 10, the main beam 92 is pushed away from the sub-trestle 1 by the pushing power mechanism, the next main beam 92 is lifted to the assembly platform 10, the next main beam 92 is connected with the pushed previous main beam 92, as shown in fig. 11, if a plurality of sections of main beams 92 are installed, the actions are installed;
(3) the installed main beam 92 is pushed away from the sub-trestle 1 by a pushing power mechanism, the rear nose bridge 93 is lifted to the assembly platform 10, the rear nose bridge 93 is connected with the main beam 92 close to the sub-trestle 1, as shown in fig. 12, the rear nose bridge 93 is lifted away from the sub-trestle 1 by the pushing power mechanism, the next rear nose bridge 93 is lifted to the assembly platform 10, the next rear nose bridge 93 is connected with the front rear nose bridge 93 which is pushed, so that the connection work of the rear nose bridge 93 is completed, the connection of the supporting mechanism is completed, the supporting mechanism is pushed to the bracket beams 8 of the first bridge pier 3 and the second bridge pier 4 longitudinally in the direction away from the sub-trestle 1 by the pushing power mechanism, as shown in fig. 13, the center of the front pivot and the bracket beam 8 is taken as a reference, and the final pushing position is determined;
in order to adapt to flat curve construction, the front nose bridge 91 and the rear nose bridge 93 are hinged with the main beam 92, and after the front nose bridge 91 and the rear nose bridge 93 horizontally rotate for a certain angle relative to the main beam 92, the other end is fixed through a backing plate and a bolt.
The propulsion power mechanism is one of an air cylinder, an electric cylinder and a hydraulic cylinder.
The propulsion power mechanism is a propulsion trolley, and each trolley is provided with two traversing hydraulic cylinders and one longitudinal hydraulic cylinder. In order to reduce the space under the bridge required by the die carrier, the longitudinal movement and the transverse movement of the movable die carrier 9 are respectively completed by a longitudinal movement hydraulic cylinder and a transverse movement hydraulic cylinder.
The elevation of the lower flange plate of the main beam 92 of the movable die frame 9 is positioned below the elevation of the water surface at the high tide level, in order to improve the construction efficiency, the assembly elevation of the movable die frame 9 is improved to be above the elevation of the water surface at the high tide level, the main beam 92, the front nose bridge 91 and the rear nose bridge 93 are longitudinally moved in place, and the cross beam 12 is integrally lowered to the construction elevation after being assembled.
The cross beam 12 is positioned between the main beams 92 of the two support mechanisms, and the ends of the cross beam 12 are connected to the main beams 92, the cross beam 12 being adapted to bear the construction load transferred by the form.
The top surface of the beam 12 is provided with a plurality of screw jacks 16, the screw jacks 16 are connected with the template, and the pre-camber of the template is adjusted by adjusting the height of the screw jacks 16.
The cross beam 12 is disposed between the two main beams 92 to carry the construction loads transferred by the form. The cross-sectional dimensions were 1.72m by 0.22m. And is connected with the main beams 92 through flanges, and each group of cross beams 12 is divided into left and right 2 pieces which are symmetrically arranged. When concrete is poured, the two cross beams 12 are bolted. A screw jack 16 is provided on the beam 12 to connect with the form. Adjusting the pre-camber of the template by adjusting the height of the mechanical spiral;
as shown in fig. 5, the form consists of a bottom form, side forms and flange forms. The bottom die blocks are directly paved on the cross beam 12 and correspond to the cross beam 12. Each pair of base plates is connected by a common bolt in the direction of the pin joint of the cross beam 12. The side forms and flange forms also correspond to the beam 12 and are mounted by form brackets and supports provided on the beam 12. The form is adjusted by the form support bar and the adjustment support base on the upper portion of the beam 12.
The invention adopts a bottom die and side die mode to realize pouring of the concrete box girder with the flat curve: the side mold adopts a segmented structure and can slide on the bottom mold, so that a flat curve can be swung out through a series of folding lines.
b installation lowering system
The 4-point synchronous lowering is adopted, a lowering frame 13 is respectively arranged on the bracket beams 8 of the first pier 3 and the second pier 4, and the lifting of the working platform is realized through the cooperation of the lowering frame 13, the sling 14 and the jack 15;
the lower frame 13 is provided with an upper hanging point, the main beam 92 is provided with a lower hanging point, and the diameter of 1860 grade is adopted15.24 steel strands are used as slings 14, each point adopts 1 jack 15 of 400t as power, the movable formwork 9 is lowered onto the bracket beam 8 by periodically acting the jacks 15, the jacks 15 are positioned on the top surface of the lowering frame 13, the jacks 15 can move along the length direction of the lowering frame 13, and the length direction is parallel to the sub-trestle 1;
the lifting points of the main beams 92 and the center positions of the lifting points of the front and rear drop frames 13 are kept on the same plumb line by installing the lifting jack 15 according to a specified position, and special attention is paid to keeping the lifting jack 15 horizontal during installation.
After the jack 15 is installed, it must be commissioned to test whether the entire system is safe. Firstly, the connection state of all parts of the jack 15 is checked in detail, including mechanical connection, circuit and oil way connection, so that the connection is accurate, then the jack 15 is in idle running, air stored in an oil cylinder is discharged, the oil pressure of the jack 15 for testing is not more than 20MPa, and if air remains in the jack 15, the running quality of the jack 15 can be affected.
c integral lifting
Before the movable die frame 9 is put down, the movable die frame 9 is integrally lifted for 0.05m and is held for a period of time, whether deformation occurs to each structural member and the connecting position or not is observed, whether the extending height of the jack 15 is retracted or not is observed, and all temporary buttresses 11 under the movable die frame 9 can be removed after normal operation;
d integrally lowering
When the movable die frame 9 is lowered, 4 bearing points should lift the jack 15 at the same time, and return oil is returned to lower the jack 15, so that the whole movable die frame 9 is stressed in a balanced manner and lowered horizontally, and special persons should observe the hanging points and the system below the connection in a side-by-side manner in the process of lowering the movable die frame 9 so as to prevent accidents;
height of lowering of the movable die carrier 9: the front hanging point is 1.35m, and the rear hanging point is 2.75m.
e drop-down calculation
(1) Load under
The lowering load comprises the dead weight of the movable die frame 9 and is 520 tons in total, as shown in fig. 6;
front lifting point stress: f (F) 1 =280 tons; and (5) stress on the rear hanging point: f (F) 2 =240 tons;
beret beam calculation
The two sides of the upper layer of the Bailey beams are provided with single-layer Bailey beams,
maximum bending moment:
maximum shear force: t=1400 kN;
the descending frame 13 is provided with 6 rows of bailey beams, the descending load is evenly distributed to the 6 rows of bailey beams through the shoulder pole beams, the maximum bending moment of a single row of bailey beams is 486.73 KN.m, and the maximum shearing force is 233.33kN;
the Bailey beam allows a bending moment of 788.2 KN.m and allows a shearing force of 245kN, so that the use requirement is met;
(2) stress calculation of jack and sling
2 jacks 15 of 400t are transversely arranged at the front and rear suspension points respectively, and the minimum breaking force of the downward suspension cable 14 is 26.07 tons, and 22 jacks are arranged in each beam;
jack 15 reserve factor:
storage coefficient of the lowering slings 14:
according to the technical specification of integral lifting of heavy structural equipment DG/TJ08-2056-2009, 7.1.3 prescribes that the total rated load of all lifting cylinders of the total lifting capacity should not be less than 1.25 times of the standard value of the total lifting load, and 7.1.2 prescribes that the design value of the tension of a single steel strand in the lifting cylinders should not exceed 50% of the breaking tension of the single steel strand, so that the reserve coefficient of the lifting capacity and the safety coefficient of the steel strand completely meet the requirements of the lifting working condition of a large-scale member.
The invention solves the problems that the offshore is not influenced by large-tonnage hoisting and tidal water, and the assembling period and the construction are complicated by improving the assembling field and the whole lowering system. According to the invention, through analyzing the actual situation and the equipment structure of the site, the problem that hoisting equipment cannot be used for lowering in a shallow sea area is solved, the movable die frame 9 is integrally lowered through combining the bailey frame and the jack, the movable die frame 9 is effectively lowered in place stably, synchronously and accurately, the tide and tide influence during assembly is avoided, and the assembly efficiency is improved.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is intended to cover various modifications, either made by the method concepts and technical solutions of the invention, or applied directly to other applications without modification, within the scope of the invention.
Claims (8)
1. The construction method for integrally lowering the large-tonnage movable formwork is characterized by comprising the following construction steps of:
a building temporary assembly platform
Two groups of bridge pier combinations for splicing are built along the direction of a secondary trestle (1), each group of bridge pier combination comprises a first bridge pier (3), a second bridge pier (4), a third bridge pier (5) and a fourth bridge pier (6) which are distributed along the direction of a main trestle (2), a plurality of fifth bridge piers (7) are arranged below the secondary trestle (1), the fifth bridge piers (7) are used for supporting the secondary trestle (1), cattle leg beams (8) are arranged on the first bridge pier (3) and the second bridge pier (4), a platform is built between the fourth bridge piers (6) and the fifth bridge piers (7), a plurality of temporary support piers (11) are built between the second bridge piers (4) and the fourth bridge piers (6), a plurality of cross beams (12) and templates are installed on the main trestle (2) by using 80-ton crawler cranes, the cross beams (12) are installed on a movable die carrier (9), the cross beams (12) are parallel to the direction of the secondary bridge (1) and the movable die carrier (12) and the movable die carrier (9), and the movable die carrier (12) are connected with the movable die carrier (9) by adopting a pushing method;
the movable die carrier (9) comprises two supporting mechanisms, each supporting mechanism comprises a plurality of sections of front nose bridges (91) which are detachably connected together, a plurality of sections of main beams (92) which are detachably connected together and a plurality of sections of rear nose bridges (93) which are detachably connected together, and the front nose bridges (91) and the rear nose bridges (93) are connected together through the main beams (92);
the elevation of a lower flange plate of a main beam (92) of a movable formwork (9) is positioned below the elevation of the water surface at the high tide level, in order to improve the construction efficiency, the assembly elevation of the movable formwork (9) is improved to be above the elevation of the water surface at the high tide level, the main beam (92), a front nose bridge (91) and a rear nose bridge (93) are longitudinally moved in place, and the whole beam (12) is lowered to the construction elevation after the assembly is completed;
b installation lowering system
The method comprises the steps of synchronously lowering 4 points, arranging a lowering frame (13) on bracket beams (8) of a first pier (3) and a second pier (4), and realizing the lifting of a working platform through the cooperation of the lowering frame (13), a sling (14) and a jack (15);
c integral lifting
Before the movable mould frame (9) is put down, the movable mould frame (9) is integrally lifted for 0.05m and is held for a period of time, whether deformation occurs to each structural member and connecting position or not is observed, whether the extending height of the jack (15) is retracted or not is observed, and all temporary buttresses (11) under the movable mould frame (9) can be removed after the jack is normal;
d integrally lowering
When the movable mould frame (9) is lowered, 4 bearing points should lift the jack (15) at the same time, and return oil is used for lowering the jack (15) at the same time, so that the whole movable mould frame (9) is balanced in stress and lowered horizontally, and special persons should carry out side-station observation on the lifting points and the system below the connection in the process of lowering the movable mould frame (9) to prevent accidents;
e drop-down calculation
The lowering calculation comprises calculation of lowering load and calculation of stress of the jack and the sling, and whether the stress of the jack and the sling meets the lowering load is judged.
2. The construction method for integrally lowering the large-tonnage movable formwork according to claim 1, wherein a propulsion power mechanism is installed on the assembly platform (10), the propulsion power mechanism is used for realizing the movement of a supporting mechanism of the assembly movable formwork (9), each time a front nose bridge (91), a main beam (92) or a rear nose bridge (93) is installed, the propulsion power mechanism propels one section of distance away from the sub-trestle (1), the installation of the front nose bridge (91), the main beam (92) or the rear nose bridge (93) of the next section is facilitated, and the propulsion power mechanism thrusts the front nose bridge (91), the main beam (92) and the rear nose bridge (93) section by section.
3. The construction method for integrally lowering the large-tonnage movable formwork according to claim 2, wherein the propulsion power mechanism is one of a cylinder, an electric cylinder and a hydraulic cylinder.
4. A construction method for integrally lowering a large tonnage moving formwork according to claim 3, characterized in that the cross beam (12) is located between the main beams (92) of the two supporting mechanisms, and the end of the cross beam (12) is connected with the main beams (92), and the cross beam (12) is used for bearing construction load transferred by the formwork.
5. The construction method for integrally lowering a large-tonnage movable formwork according to claim 4, wherein a plurality of screw jacks (16) are mounted on the top surface of the cross beam (12), the screw jacks (16) are connected with the formwork, and the pre-camber of the formwork is adjusted by adjusting the heights of the screw jacks (16).
6. The construction method for integrally lowering large tonnage movable formwork according to claim 5, wherein the lowering frame (13) is provided with an upper hanging point, the main beam (92) is provided with a lower hanging point, and the 1860-level diameter is adoptedThe steel strand wires are as hoist cable (14), and every point adopts 1400 t jack (15) to be power, through periodic action jack (15), will remove formwork (9) and drop on bracket roof beam (8), jack (15) are located and drop frame (13) top surface, and jack (15) can follow and drop frame (13) length direction and remove, and this length direction is parallel with sub-landing stage (1).
7. The construction method for integrally lowering a large-tonnage moving die carrier according to claim 6, characterized in that the moving die carrier (9) is lowered to a height: the front hanging point is 1.35m, and the rear hanging point is 2.75m.
8. The construction method for integrally lowering a large-tonnage movable formwork according to claim 7, wherein the temporary buttress (11) is a steel pipe pile.
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