CN117188760A - Upper suspension and lower bearing combined concrete formwork supporting structure and construction method - Google Patents

Abstract

The invention discloses an upper-suspension lower-bearing combined concrete formwork support structure and a construction method. The invention has the beneficial effects that: the invention has good adaptability, the floor type frame body adopts 60 series disc buckles, and the bearing capacity of a single upright rod can be 9t; and compared with the construction method of building a steel structure platform layer by layer, the construction method has the advantages of mature construction process, high safety and relatively low cost.

Description

A top-suspended and bottom-loaded combined concrete formwork support structure and construction method

Technical field

The invention relates to the technical field of formwork support construction, in particular to an upper-suspended and lower-bearing combined concrete formwork support structure and a construction method.

Background technique

With the development of high-strength concrete, high-strength steel, prestressed and other materials, architectural designers' aesthetic requirements for building structural shapes have become higher and easier to achieve. Concepts such as "castles in the sky" and "suspended" have gradually become reality, forming a series of various building structures such as "large-span cantilever structures", "layer-by-layer cantilever structures", and "high-rise cantilever structures". The renderings show extremely Excellent, it has gained the support of a large number of owners.

1. For example, a Chinese patent discloses a cantilevered steel formwork for high-altitude cantilevered structures (Application No.: CN201520743757. Formwork and formwork, the concrete structural components and the bottom ends of the cantilevered steel beams are pressed together in the vertical direction, the cantilevered steel beams are provided with formwork frames, and formwork is laid between the formwork frames; there are also It is provided with a U-shaped bolt whose lower end is embedded in the concrete component, and also includes a pressure plate. The pressure plate is provided with a threaded hole. The vertical top of the U-shaped bolt passes through the threaded hole of a pressure plate and is then locked and connected with a nut. The pressure plate and the top of the cantilevered steel beam are pressed together in the vertical direction, making full use of the original structural conditions and the load-bearing capacity of the steel beam. The cantilevered steel beam is installed on the layer below the high-altitude cantilevered component in the form of a cantilevered outer frame. Beams, erect steel pipe support frames and install formwork on cantilevered steel beams to construct high-altitude cantilevered reinforced concrete structures.

2. For example, the Chinese patent discloses an ultra-long cantilever truss structure high-altitude formwork support system (Application No.: CN201320405186. Legs, pull-up wire ropes, and lower concrete trusses. The upper frame body includes a load-bearing formwork frame, an outer protective frame, and an upper concrete truss. One end of the steel cantilever beam is fixed on the top of the lower concrete truss and extends out. The top of the lower concrete truss, the bottom of the lower support steel corbels is fixed on the middle part of the lower concrete truss, the top is fixed on the bottom of the cantilever beam, the lower support steel corbels extend along the cantilever beam The extension direction is inclined from bottom to upward, the bottom of the steel wire rope is fixed on the top of the cantilever beam, the top is fixed on the bottom of the upper concrete truss, the top of the load-bearing formwork is fixed on the upper concrete truss, and the bottom is fixed In the cantilever beam, the outer protective frame is arranged outside the load-bearing formwork frame. Reducing the input of turnover materials saves costs, reduces erection time, and improves the unit time utilization of machinery and personnel.

Although some cantilever truss structures are provided in the existing technology, the complex structure adds considerable construction difficulty to the construction party.

Therefore, it is necessary to propose a top-suspended and bottom-bearing combined concrete formwork support structure and construction method to solve the above problems.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an upper-suspended and lower-bearing combined concrete formwork support structure and a construction method to solve the above problems.

A top-suspended and bottom-bearing combined concrete formwork support structure, including a floor-standing conventional formwork frame, a floor-standing high formwork frame, and a cantilevered formwork frame. The floor-standing conventional formwork frame is built on the lower inner side of the main structure. , the floor-standing high formwork frame is built on the outside of the lower part of the main structure, and the cantilevered formwork frame is built on the cantilevered parts layer by layer above the main structure.

Preferably, the cantilevered formwork is built on the layer-by-layer overhanging portion above the main structure through a combined I-beam cantilever foundation.

Preferably, the combined I-beam cantilever foundation includes a pre-embedded U-shaped ring, a cantilevered I-beam main beam and a lower brace I-beam. The pre-embedded U-shaped ring is pre-embedded in the main structure. The cantilevered I-beam main beam is installed in the main structure through a pre-embedded U-shaped ring, and the lower brace I-beam is supported below the cantilevered I-beam main beam.

Preferably, short positioning steel bars and pull-up wire rope lifting lugs are welded to the top of the cantilevered I-beam main beam.

Preferably, the lower end of the lower support I-beam is welded to the embedded plate, and the lower end of the lower support I-beam is provided with a first angle steel baffle on the inner side of the main structure. The upper end is connected to the cantilevered I-beam main beam, and a second angle steel baffle is provided on the upper end of the lower support I-beam near the outside of the main structure.

Preferably, the embedded plate is embedded in the main structure.

Preferably, the floor-standing high formwork frame on the lower side of the cantilevered formwork frame is extended outward to form a floor-standing outer frame body.

Preferably, the floor-standing outer frame body is provided with double channel steel joists, and the double channel steel joists are provided with jacks, and the jacks press against the cantilevered I-beam main beam.

Preferably, an oblique double row of vertical poles is provided outside the cantilevered formwork frame.

A construction method for a top-suspended and bottom-loaded combined tall concrete formwork support. The method steps are:

S1. Set up the floor-standing conventional formwork and construct the lower main structure layer by layer. Set up the floor-standing high formwork layer by layer. The floor-standing high formwork and the floor-standing conventional formwork are overlapped and connected to form a whole;

S2. Use a tower crane or truck crane to hoist the cantilevered I-beam main beams on the construction floor of the main structure. Lay the cantilevered I-beam main beams evenly on the construction floor at a certain distance and connect them with the pre-embedded steel beams. Buried U-shaped ring for fixation;

S3. Lift the lower support I-beam to the next floor of the construction floor of the main structure in advance, place the lower support I-beam at the designated position, and weld the upper end of the lower support I-beam to the cantilevered I-beam main beam. Firmly, weld the lower end of the lower support I-beam to the pre-embedded embedded plate;

S4. Weld the first angle steel baffle and the second angle steel baffle at the lower end and upper end of the lower support I-beam respectively for strengthening treatment. Weld the positioning short steel bars and the pull-up wire rope lifting lugs on the top of the cantilevered I-beam main beam for convenience. Subsequent steel pipe positioning and pull-up wire rope layout;

S5. Install the double-channel steel joist on the floor-standing outer frame. Install the jacking support on the double-channel steel joist. Firmly tighten the bottom of the cantilevered I-beam main beam through the jacking bracket and the two double-channel steel joists. ;

S6. Erection of cantilevered formwork. A full-length cantilevered formwork is erected above the cantilevered I-beam main beam to support the self-weight and construction load of the reinforced concrete floors to be constructed. When erecting, priority is given to erecting diagonal double-row formwork. The vertical pole is used as a safety protection frame. The space between the cantilevered I-beam main beams is hard-sealed with formwork timber to form a safe and enclosed working environment, and then other frames are erected on the inside;

S7. Set up oblique double rows of vertical poles between the upper and lower cantilevered side beams of the main structure. The oblique double rows of vertical poles are connected to the cantilevered formwork through fasteners to form a triangular stable system;

S8. Continue upward construction according to steps S2 to S7. When the floor is high, you need to arrange the position of the tower crane in advance and use the tower crane to hoist construction materials;

S9. Remove the formwork. After the concrete structural strength reaches the design and specification requirements, dismantle the formwork part by part from top to bottom. First remove the cantilevered formwork. After the removal is completed, cut and remove the lower support I-beam. , and finally transfer the cantilevered I-beam main beam in a unified manner, and finally dismantle the floor-standing conventional formwork and the floor-standing high formwork.

Compared with the existing technology, the present invention has beneficial effects: the formwork support structure of the present invention can meet the normal construction requirements of layer-by-layer cantilever structures. In theory, the construction method is not limited by floor height; for lower-floor cantilever structures, there are more , more complex and heavier loads, the formwork support structure of the present invention has good adaptability. The floor-standing frame adopts 60 series buckles, which can achieve a single vertical pole bearing capacity of 9t; the present invention adopts a more economical construction method. Compared with erecting steel structure platforms layer by layer, this method has mature construction technology, high safety, and relatively cheap cost; it can be widely used in the construction of all structures that cantilever outward layer by layer, and has promotion value.

Description of the drawings

Figure 1 is a structural diagram of the upper-suspended and lower-bearing combined concrete formwork support structure of the present invention;

Figures 2 and 3 are structural diagrams of the combined I-beam cantilever foundation of the present invention;

Figure 4 is a schematic diagram of the floor-standing outer frame body of the present invention;

Figure 5 is a structural diagram of the double channel steel joist and jacking connection structure of the present invention;

Figure 6 is a flow chart of the erection method of the present invention.

Reference numbers in the figure: 1. Floor-standing conventional formwork; 2. Floor-standing high formwork; 3. Cantilevered formwork; 4. Combined I-beam cantilever foundation; 401. Pre-embedded U-shaped ring ; 402. Cantilevered I-beam main beam; 403. Lower support I-beam; 404. Positioning short steel bars; 405. Pull-up wire rope lifting lugs; 406. Embedded plate; 407. First angle steel baffle; 408. Section Diagonal steel baffle; 501, floor-standing outer frame; 502, double channel steel joists; 503, jacking; 6, diagonal double rows of vertical poles; 7, main structure.

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and The simplified description is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined by "first," "second," etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

As shown in Figure 1 in conjunction with Figures 2 to 6, a top-suspended and bottom-bearing combined concrete formwork support structure includes a floor-standing conventional formwork frame 1, a floor-standing high formwork frame 2, and a cantilevered formwork frame 3 , the floor-standing conventional formwork 1 is built on the lower inside of the main structure 7, the floor-standing high formwork 2 is built on the lower outside of the main structure 7, and the cantilevered formwork 3 is built on the main structure 7 layer-by-layer overhang above.

Furthermore, the cantilevered formwork frame 3 is built on the layer-by-layer cantilevered portion above the main structure through a combined I-beam cantilever foundation 4.

Further, the combined I-beam cantilever foundation 4 includes a pre-embedded U-shaped ring 401, a cantilevered I-beam main beam 402 and a lower brace I-beam 403. The pre-embedded U-shaped ring 401 is pre-embedded in the main structure. 7, the cantilevered I-beam main beam 402 is installed in the main structure 7 through a pre-embedded U-shaped ring 401, and the lower support I-beam 403 is supported below the cantilevered I-beam main beam 402.

Further, short positioning steel bars 404 and pull-up wire rope lifting lugs 405 are welded to the top of the cantilevered I-beam main beam 402.

Further, the lower end of the lower support I-beam 403 is welded to the embedded plate 406. The lower end of the lower support I-beam 403 is provided with a first angle steel baffle 407 on the inner side of the main structure. The upper end of the I-beam 403 is connected to the cantilevered I-beam main beam 402. The upper end of the lower support I-beam 403 is provided with a second angle steel baffle 408 on a side close to the outside of the main structure.

Further, the embedded plate 406 is embedded in the main structure 7 .

Further, the floor-standing high formwork frame 2 on the lower side of the cantilever-type formwork frame 3 is extended outward to form a floor-standing outer frame body 501.

Further, the floor-standing outer frame body 501 is provided with double channel steel joists 502, and the double channel steel joists 502 are provided with jacks 503, and the jacks 503 press against the cantilevered I-beam main beam 402. .

Furthermore, an oblique double row of vertical poles 6 is provided outside the cantilevered formwork frame 3 .

A construction method for a top-suspended and bottom-loaded combined tall concrete formwork support. The method steps are:

S1. Set up floor-standing conventional formwork 1 layer by layer and construct the lower concrete structure. The frame body will not be dismantled. Floor-standing high formwork 2 is erected layer by layer. The outer floor-standing high formwork 2 and the inner floor-standing conventional formwork The formwork frame 1 is overlapped and connected to form a whole.

S2. Use a tower crane or truck crane to hoist the cantilevered I-beam main beams 402 on the construction floor, that is, the top of the floor-standing high support formwork 2, and use mechanical cooperation to evenly space the cantilevered I-beam main beams 402 at a certain distance. It is laid on the floor surface and fixed with the buried U-shaped ring 401 that has been embedded in advance.

S3. Hoist the lower support I-beam 403 in advance to the floor below the planned construction floor, and use the outer frame or the next floor's formwork support and electric hoist to place the lower support I-beam 403 in the designated position, and then The upper end of the lower support I-beam 403 is manually welded firmly to the cantilevered I-beam main beam 402, and the lower end of the lower support I-beam 403 is welded and connected to the pre-embedded embedded plate 406.

S4. Weld the first angle steel baffle 407 and the second angle steel baffle 408 to the lower end and upper end of the lower support I-beam 403 respectively for reinforcement processing, and weld the positioning short steel bar 404 and pull-up on the top of the cantilevered I-beam main beam 402. Wire rope lifting lugs 405 facilitate the subsequent positioning of steel pipes and the arrangement of pull-up wire ropes.

S5. Install the double channel steel joist 502 on the floor-standing outer frame 501. Install the jack 503 on the double channel steel joist 502. Connect the cantilevered I-beam main beam through the jack 503 and the two double channel steel joists 502. The bottom of the beam is firmly tightened.

S6. Erection of the cantilevered formwork. Set up the full-length cantilevered formwork 3 above the cantilevered I-beam main beam 402 to support the self-weight and construction load of the reinforced concrete floors to be constructed. When erecting, the diagonal formwork is given priority. The double-row vertical poles 6 serve as a safety protection frame. At the same time, the space between the cantilevered I-beam main beams 402 is hard-sealed with formwork timber to form a safe and enclosed working environment, and then other inner frames are erected.

S7. Set up oblique double rows of vertical poles 6 between the upper and lower cantilevered side beams of the main structure. The oblique double rows of vertical poles 6 are connected to the cantilevered formwork frame 3 through fasteners to form a triangular stable system.

S8. Continue upward construction according to steps S2 to S7. When the floor is high, you need to arrange the position of the tower crane in advance and use the tower crane to hoist construction materials.

S9. The frame body is dismantled. After the concrete structural strength reaches the design and specification requirements, the formwork frame is dismantled part by part from top to bottom. First, remove the cantilever formwork frame 3. After the disassembly is completed, cut and dismantle the lower support I-beam. 403, finally transfer the cantilevered I-beam main beam 402 in a unified manner, and finally dismantle the floor-standing conventional formwork 1 and the floor-standing high formwork 2.

Compared with the existing technology, the present invention has beneficial effects: the formwork support structure of the present invention can meet the normal construction requirements of layer-by-layer cantilever structures. In theory, the construction method is not limited by floor height; for lower-floor cantilever structures, there are more , more complex situations with larger loads, the formwork support structure has good adaptability. The floor-standing frame adopts 60 series buckles, which can achieve a single pole bearing capacity of 9t; a more economical construction method is adopted, which is better than gradually The steel structure platform is erected layer by layer, the construction technology is mature, the safety is high, and the cost is relatively cheap; it can be widely used in the construction of all structures that cantilever outward layer by layer, and has promotion value.

Working principle: Set up floor-standing conventional formwork 1 layer by layer and construct the lower concrete structure. The frame body will not be dismantled. Floor-standing high formwork 2 is erected layer by layer. The outer floor-standing high formwork 2 and the inner floor-standing formwork 2 The conventional formwork frame 1 is overlapped and connected to form a whole; a tower crane or a truck crane is used to hoist the cantilevered I-beam main beam 402 on the construction floor, that is, the top of the floor-standing high formwork frame 2, and the mechanical cooperation will The cantilevered I-beam main beams 402 are laid evenly on the floor at a certain distance and fixed with the embedded U-shaped rings 401 that have been pre-embedded in advance; the lower support I-beam 403 is hoisted in advance to the floor below the floor to be constructed. , and use the outer frame or the full hall formwork of the next floor and the electric hoist to place the lower support I-beam 403 at the designated position, and then manually weld the upper end of the lower support I-beam 403 to the cantilevered I-beam main beam 402 Firmly, weld the lower end of the lower support I-beam 403 to the pre-embedded embedded plate 406; weld the first angle steel baffle 407 and the second angle steel baffle 408 to the lower end and upper end of the lower support I-beam 403 respectively for reinforcement. Process, weld positioning short steel bars 404 and pull-up wire rope lifting lugs 405 on the top of the cantilevered I-beam main beam 402 to facilitate subsequent steel pipe positioning and pull-up wire rope layout; install the double-channel steel joist 502 on the floor-standing outer frame On 501, the double channel steel joists 502 are installed with jacking supports 503, and the bottom of the cantilevered I-beam main beam 402 is firmly tightened through the jacking supports 503 and the two double channel steel joists 502; the cantilevered formwork frame 3 is erected , set up a full-hall cantilevered formwork frame 3 above the cantilevered I-beam main beam 402 to support the self-weight and construction load of the reinforced concrete floors to be constructed; when erecting, give priority to erecting diagonal double rows of vertical poles 6 as safety protection At the same time, the cantilevered I-beam main beams are hard-sealed with formwork timber to form a safe and enclosed working environment, and then other inner frames are erected; the upper and lower cantilevered side beams of the main structure 7 are An oblique double row of vertical poles 6 is erected in between. The oblique double row of vertical poles 6 are connected to the cantilevered formwork frame 3 through fasteners to form a triangular stable system. Continue to repeat the above construction process upwards. When the floor is higher, It is necessary to arrange the position of the tower crane in advance and use the tower crane to hoist construction materials; after the frame is dismantled and the strength of the concrete structure reaches the design and specification requirements, the formwork is dismantled part by part from top to bottom. First, dismantle the cantilever formwork 3, and then dismantle the formwork. After completion, the lower support I-beam 403 is removed and removed, and finally the cantilevered I-beam main beam 402 is transferred uniformly. Finally, the floor-standing conventional formwork 1 and the floor-standing high formwork 2 are dismantled.

The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related The technical fields are all equally included in the scope of patent protection of the present invention.

Claims (10)

1. A top-suspended and bottom-bearing combined concrete formwork support structure, which is characterized by: including a floor-standing conventional formwork frame (1), a floor-standing high formwork frame (2), and a cantilevered formwork frame (3). The floor-standing conventional formwork (1) is built on the lower inside of the main structure, the floor-standing high formwork (2) is built on the lower outside of the main structure, and the cantilevered formwork (3) is built on the lower side of the main structure. A layer-by-layer overhang above the main structure (7). 2. A top-suspended and bottom-loaded combined concrete formwork support structure as claimed in claim 1, characterized in that: the cantilevered formwork frame (3) is built on a combined I-beam cantilevered foundation (4). The layer-by-layer overhang above the main structure (7). 3. A top-suspended and bottom-loaded combined concrete formwork support structure as claimed in claim 2, characterized in that: the combined I-beam cantilever foundation (4) includes a pre-embedded U-shaped ring (401), a cantilevered I-beam main beam (402) and lower support I-beam (403), the embedded U-shaped ring (401) is pre-embedded in the main structure, and the cantilevered I-beam main beam (402) is pre-embedded The U-shaped ring (401) is installed in the main structure, and the lower support I-beam (403) is supported below the cantilevered I-beam main beam (402). 4. A top-suspended and bottom-loaded combined concrete formwork support structure as claimed in claim 3, characterized in that: the top of the cantilevered I-beam main beam (402) is welded with positioning short steel bars (404) and pull-up Wire rope lifting lugs (405). 5. A top-suspended and bottom-bearing combined concrete formwork support structure as claimed in claim 3, characterized in that: the lower end of the lower support I-beam (403) is welded to the embedded plate (406), and the The lower end of the lower support I-beam (403) is provided with a first angle steel baffle (407) on the inner side of the main structure (7). The upper end of the lower support I-beam (403) is in contact with the cantilevered I-beam main beam. (402) connection, the upper end of the lower support I-beam (403) is provided with a second angle steel baffle (408) on a side close to the outside of the main structure (7). 6. A top-suspended and bottom-bearing combined concrete formwork support structure as claimed in claim 5, characterized in that: the embedded plate (406) is pre-embedded in the main structure (7). 7. A top-suspended and bottom-bearing combined concrete formwork support structure as claimed in claim 1, characterized in that: the floor-standing high formwork frame (2) on the lower side of the cantilevered formwork frame (3) Extending outward is a floor-standing outer frame body (501). 8. A top-suspended and bottom-bearing combined concrete formwork support structure as claimed in claim 7, characterized in that: the floor-standing outer frame body (501) is provided with double channel steel joists (502), and the The double-channel steel joist (502) is provided with a jack (503), and the jack (503) holds against the cantilevered I-beam main beam (402). 9. A top-suspended and bottom-loaded combined concrete formwork support structure as claimed in claim 1, characterized in that: an oblique double row of vertical poles (6) is provided outside the cantilevered formwork frame (3). 10. The construction method of a top-suspended and bottom-bearing combined concrete formwork support structure as described in any one of claims 1 to 9, characterized in that the method steps are: S1. Set up the floor-standing conventional formwork (1) layer by layer and construct the lower main structure 7. Set up the floor-standing high formwork (2) layer by layer. The floor-standing high formwork (2) is combined with the floor-standing conventional formwork. The formwork (1) is overlapped and connected to form a whole; S2. Use a tower crane or truck crane to hoist the cantilevered I-beam main beam (402) on the construction floor of the main structure (7), and lay the cantilevered I-beam main beam (402) evenly on the construction floor at a certain distance. and fix it with the embedded U-shaped ring (401) that has been embedded in advance; S3. Hoist the lower support I-beam (403) in advance to the next floor of the construction floor of the main structure (7), place the lower support I-beam (403) at the designated position, and place the lower support I-beam (403) at the designated position. The upper end of 403) is firmly welded to the cantilevered I-beam main beam (402), and the lower end of the lower support I-beam (403) is welded to the embedded plate (406) embedded in advance; S4. Weld the first angle steel baffle (407) and the second angle steel baffle (408) to the lower end and upper end of the lower support I-beam (403) respectively for reinforcement processing. At the top of the cantilevered I-beam main beam (402) Weld positioning short steel bars (404) and pull-up wire rope lifting lugs (405); S5. Install the double-channel steel joist (502) on the floor-standing outer frame (501). Install the jacking bracket (503) on the double-channel steel joist (502). Use the jacking bracket (503) and the two double-channel steel beams. The joist (502) firmly presses the bottom of the cantilevered I-beam main beam (402); S6. Erection of the cantilevered formwork (3). Set up the full-hall cantilevered formwork (3) above the cantilevered I-beam main beam (402) to support the self-weight and construction load of the reinforced concrete of the floor to be constructed; When erecting, priority is given to erecting diagonal double rows of vertical poles (6) as a safety protection frame. The space between the cantilevered I-beam main beams (402) is hard-sealed with formwork timber to form a safe and closed operation. environment, and then set up other frames on the inside; S7. Set up oblique double rows of vertical poles (6) between the upper and lower cantilevered side beams of the main structure (7). The oblique double rows of vertical poles (6) are connected to the cantilevered formwork frame (3) through fasteners. Connect to form a triangular stable system; S8. Continue upward construction according to steps S2 to S7. When the floor is high, you need to arrange the position of the tower crane in advance and use the tower crane to hoist construction materials; S9. Dismantle the formwork. After the concrete structural strength reaches the design and specification requirements, dismantle the formwork part by part from top to bottom. First remove the cantilevered formwork (3). After the disassembly is completed, cut and dismantle the lower supports. The I-beam (403), and finally the cantilevered I-beam main beam (402) are transferred uniformly, and the floor-standing conventional formwork (1) and the floor-standing high formwork (2) are dismantled.