CN114197526B - Formwork system with vertical structure by reverse construction method and construction method - Google Patents

Abstract

The invention provides a formwork supporting system of a vertical structure by a reverse construction method and a construction method, wherein the formwork supporting system comprises a wall formwork unit and a column formwork unit; the wall mold unit comprises a plate main body, a framework and a lifting casting assembly, wherein slots are formed in two sides of the plate main body, the framework is arranged on the back side of the plate main body, the lifting casting assembly comprises a casting head and a lifting member, one end of the lifting member is connected with the framework, the other end of the lifting member is connected with the casting head, and the casting head is driven to lift along the height direction of the plate main body; the column mould unit comprises an arc-shaped section and straight line sections, and the straight line sections are arranged on two sides of the arc-shaped section; the column mould unit is inserted into the slot of the wall mould unit by the straight line section of the column mould unit. Each part in the system is prefabricated in a factory, the number of units needed is calculated according to the field working condition, standardization is convenient to realize, and the prefabrication and field assembly of the template in the factory are beneficial to shortening the construction period. And through controlling the removal of pouring the head, can reduce the concrete volume that the later stage needs to be handled, can reduce the construction degree of difficulty, improve the efficiency of construction.

Description

Formwork system with vertical structure by reverse construction method and construction method

Technical Field

The invention belongs to the field of underground building construction, and particularly relates to a formwork system of a vertical structure by a reverse construction method and a construction method.

Background

Along with the rapid development of economic construction in China, the scale of construction engineering is larger and larger, high-rise buildings and underground buildings are more and more, and particularly, adjacent buildings are more and more constructed in old cities. The reverse construction method has the advantages that the density of urban buildings is high, adjacent buildings and surrounding environments are sensitive to settlement deformation, construction sites are narrow, construction period is short, the construction effect under urban traffic main roads which are urgent to recover ground traffic is particularly obvious, a large amount of funds are saved, and construction progress is accelerated.

Under the guidance of national guidelines for developing novel construction technologies, a great amount of innovative construction progress appears in front of people, and the reverse construction method construction technology formally steps into the sight of people

The reverse construction method is a top-down reverse construction technology, and generally a basement roof structure system is poured firstly, and then the lateral stiffness of the basement roof structure system is used as a transverse support to construct a lower-layer main structure downwards. The reverse construction method is suitable for complex deep foundation pit engineering with high requirements on environmental protection. The maintenance structure around the foundation pit in the reverse construction method structure adopts the underground continuous wall construction technology of two-in-one wall to replace the traditional outer wall, and the formal main structure beam plate replaces the traditional temporary support, so that the problems of foundation pit enclosure, temporary support construction and dismantling can be effectively solved, and resources are effectively saved.

In the construction of the reverse construction method, the vertical structure is usually completed in two times. A few gaps often appear between the concrete poured successively in the reverse construction of the column and the wall, and the gaps inevitably influence the transmission of the load of the upper structure, thereby restricting the application and popularization of the reverse construction method technology to a certain extent.

On the other hand, because the formwork system is unreasonable, large concrete blocks exist between the early casting section and the later casting section after the construction of the vertical structure is completed and need to be removed, the erecting process of the existing formwork system is complex, the standardization degree of each part is poor, the formwork is difficult to use, and the construction cost is not reduced and the construction period is not guaranteed.

Disclosure of Invention

The invention aims to provide a reverse construction method vertical structure formwork system with high standardization degree and capability of reducing post-processing amount and a construction method capable of eliminating a horizontal seam between a pre-cast structure and a post-cast structure

The invention provides a formwork system with a vertical structure by a reverse construction method, which comprises a wall formwork unit and a column formwork unit; the wall mold unit comprises a plate main body, a framework and a lifting casting assembly, wherein slots are formed in two sides of the plate main body, the framework is arranged on the back side of the plate main body, the lifting casting assembly comprises a casting head and a lifting member, one end of the lifting member is connected with the framework, the other end of the lifting member is connected with the casting head, and the casting head is driven to lift along the height direction of the plate main body; the column mould unit comprises an arc-shaped section and straight line sections, and the straight line sections are arranged on two sides of the arc-shaped section; the column mould unit is inserted into the slot of the wall mould unit by the straight line section of the column mould unit.

The plate main body comprises a vertical plate, a bottom rib, a top seat and a base; the top of riser is equipped with the lift groove, and bottom rib and top rib all connect in the dorsal part of riser, and bottom rib and top rib parallel arrangement, footstock set up under the top rib, and the base sets up on the bottom rib.

The top seat is a conical seat, the small-diameter end of the top seat is connected with the top rib, and the inner wall of the top seat is provided with a rubber pad.

The skeleton comprises a longitudinal bone and a transverse bone; the longitudinal frame is a telescopic frame, the top end of the longitudinal frame is provided with a conical head, the outer wall of the longitudinal frame is provided with a limiting groove, one end of the longitudinal frame is arranged in the base, and the other end of the longitudinal frame is tightly propped against the top seat through the conical head; the transverse bone is arranged in the limit groove and locked by a buckle.

The pouring head comprises a flat plate, a horn mouth and a vertical plate, the flat plate comprises a through hole, the flat plate is connected to the large-diameter end of the horn mouth, the small-diameter end of the horn mouth is connected with the vertical plate, and the vertical plate is inserted into the lifting groove.

The lifting member is a telescopic rod, one end of the lifting member is connected with the horn mouth, and the other end of the lifting member is connected with the framework.

The lifting pouring assembly further comprises a pouring pipe; the pouring pipe comprises an embedded section, a contraction section and a connector which are sequentially connected from top to bottom; the pre-buried section is pre-buried in the pre-cast floor slab, and the connector is connected with the flat plate through a flange.

The system also comprises a locking assembly, wherein the locking assembly comprises a fixed nut, a screw rod, a nut seat and a pull rod; the pair of fixed nuts are respectively arranged on the back sides of the arc-shaped sections; the screw threads at the two ends of the screw rod are opposite in rotating direction, and the screw rod is connected between the pair of fixed nuts; the pair of nut seats are arranged at two ends of the screw rod; one end of the pull rod is connected with the nut seat, and the other end of the pull rod is hinged with the framework.

The invention also provides a construction method of the vertical structure by the reverse construction method, which is characterized by comprising the following steps:

s.1, reversely constructing a floor slab, wherein the floor slab comprises a first-pouring vertical section, at least 300mm is arranged below the first-pouring vertical section, and a pouring hole is reserved in the floor slab;

s.2, erecting a formwork system, and embedding the top end of the pouring pipe into a pouring hole;

s.3, secondary pouring, wherein when the pouring vertical structure is poured to the bottom end of the bell mouth, the pouring head is controlled to move upwards until the bottom end of the bell mouth is flush with the bottom surface of the first-pouring vertical section, and pouring is continued until the pouring vertical structure is higher than the bottom surface of the first-pouring vertical section by more than 300 mm;

and S4, maintaining.

The back-built vertical structure comprises a structural column, a lower beam shear wall and a non-beam shear wall;

the structural columns and the shear walls under the beams are fed by adopting an over-filling method, and cement mortar with the thickness of 30-50 mm and the same components as the mortar in the concrete is uniformly and virtually paved on the bottom surface before reinjection;

the beamless shear wall is built again by grouting method, cement mortar with thickness of 30-50 mm and same composition as that of mortar in concrete is laid on the bottom surface before re-injection, when re-injection, pouring is stopped 50-100 mm below the bottom surface of the lower section, after treating the concrete laitance at the lower part and cleaning the bottom surface of the upper concrete, the base surface is moistened and poured again.

The wall formwork unit and the column formwork unit are prefabricated in a factory, the number of the units needed to be used is calculated according to the site working condition, standardization is convenient to achieve, the template is prefabricated in the factory and assembled on the site, the construction period can be shortened, when the template is assembled on the site, the wall formwork unit and the column formwork unit are erected on the position to be poured on the foundation, the straight line section of the column formwork unit is inserted into the inserting groove of the wall formwork unit and locked, and a pouring cavity is defined. During pouring, the stress of the vertical structure at the joint is effectively and reliably transmitted through secondary re-pouring, and the bearing performance is ensured; and through controlling the removal of pouring the head, can reduce the concrete volume that the later stage needs to be handled, can reduce the construction degree of difficulty, improve the efficiency of construction.

Drawings

Fig. 1 is a schematic front view of a formwork system in a preferred embodiment of the present invention.

Fig. 2 is a schematic top view of the formwork system in the preferred embodiment.

Fig. 3 is an enlarged schematic view of the plate main body in the present preferred embodiment.

Fig. 4 is a cross-sectional enlarged schematic view of an assembly joint of a top rib and a longitudinal bone in the preferred embodiment.

Fig. 5 is an enlarged schematic view of the skeleton in the present preferred embodiment.

Fig. 6 is an enlarged assembly view of the cast riser assembly of the preferred embodiment.

Fig. 7 is an enlarged schematic view of the locking assembly in the preferred embodiment.

Fig. 8 is a flow chart of the construction method in the present preferred embodiment.

Reference numerals

1-a wall form unit, wherein,

11-plate main body, 111-vertical plate, 112-bottom rib, 113-top rib, 114-top seat, 115-base, 116-rubber pad,

12-framework, 121-longitudinal bone, 122-transverse bone, 123-conical head, 124-lock catch, 125-ear plate,

13-lifting pouring component,

131-pouring tube, 1311-embedded section, 1312-shrinkage section, 1313-connector,

132-pouring head, 1321-flat plate, 1322-bell mouth, 1323-vertical plate,

133-a lifting member;

2-column mould unit, 21-arc section, 22-straight section, 23-mounting plate;

3, a locking component, 31, a fixed nut, 32, a screw rod, 33, a nut seat, 34, a pull rod and 35, wherein the nut seat is a hexagonal prism;

and 4, pouring the floor slab firstly.

Detailed Description

It should be apparent that the embodiments described below are some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly specified or limited.

As shown in fig. 1 and fig. 2, the vertical structure formwork system of the reverse construction method provided by the present embodiment includes a wall formwork unit 1, a column formwork unit 2 and a locking assembly 3; the column formwork unit 2 and the wall formwork units 1 on the two sides are locked through the locking assemblies 3 to form a pouring cavity.

The wall form unit 1 comprises a plate body 11, a framework 12 and a lifting casting assembly 13, wherein the framework 12 and the lifting casting assembly 13 are arranged on the back side of the plate body 11.

As shown in fig. 3 and 4, the plate main body 11 includes a vertical plate 111, a bottom rib 112, a top rib 113, a top seat 114, and a bottom seat 115. The vertical plate 111 is a rectangular plate, the top of which is provided with a lifting groove, and the two sides of which are provided with slots. The bottom rib 112 is a channel steel, the bottom rib 112 is equal in length to the vertical plate 111, the bottom rib 112 is arranged along the length direction of the vertical plate 111, and the bottom rib 112 is buckled on the back side of the vertical plate 111 and welded. The top rib 113 is made of channel steel with the same type as the bottom rib 112, the length of the top rib 113 is matched with the distance between two adjacent lifting grooves, and the top ribs 113 are sequentially arranged and welded along the length direction of the vertical plate 111. As shown in fig. 2 and 3, the top seat 114 is a tapered seat with a large diameter end facing, and a small diameter end thereof is welded to the top rib 113 and provided with a rubber pad 116 on an inner wall thereof. The top seats 114 are uniformly arranged along the length of the top rib 113. The base 115 is a cylindrical seat for mounting the frame 12, and the base 115 and the top seat 114 are correspondingly arranged.

As shown in fig. 4 and 5, the frame 12 is a cross frame, and includes a longitudinal frame 121 and a transverse frame 122. The longitudinal frame 121 is a telescopic frame and is arranged along the height direction of the vertical plate 111, a conical head 123 is arranged at the top end of the longitudinal frame 121, the outer diameter of the conical head 123 is matched with the inner diameter of the top seat 114, and a limiting groove is formed in the outer wall of the longitudinal frame 121 so as to install the transverse frame 122. The transverse ribs 122 are square steel tubes, the outer diameters of the transverse ribs are matched with the calibers of the limiting grooves, the transverse ribs 122 are arranged along the length direction of the vertical plate 111, and the transverse ribs 122 are clamped into the limiting grooves and fastened through the lock catches 124. The outermost longitudinal rib 121 of the framework 12 is provided with an ear plate 125 for installing the locking component 3, and the framework 12 plays a supporting and reinforcing role for the plate main body 11 and also serves as an installation foundation for the cast-in-place component 13.

As shown in fig. 6, the lift casting assembly 13 includes a casting tube 131, a casting head 132, and a lift member 133. The pouring tube 131 is an assembly part and comprises an embedded section 1311, a contraction section 1312 and a connector 1313 which are sequentially connected from top to bottom; the embedded section 1311 is made of PVC pipes, the embedded section 1311 is embedded in a pouring hole of the cast floor slab 4, one end of the contraction section 1312 is connected with the embedded section 1311, the other end of the contraction section is connected with the connector 1313, and the connector 1313 is connected with the pouring head 132 through a flange. The pouring head 132 comprises a flat plate 1321, a bell mouth 1322 and a vertical plate 1323, the flat plate 1321 comprises a through hole, the flat plate 1321 is connected to the large-diameter end of the bell mouth 1322, the small-diameter end of the bell mouth 1322 is connected with the vertical plate 1323, and the vertical plate 1323 is inserted into the lifting groove at the top of the plate body 11. A transition arc section is arranged between the bell mouth 1322 and the vertical plate 1323 to prevent the concrete from entering the area to be poured after the concrete rises to the right position. The lifting member 133 is a hydraulic cylinder, the cylinder body of the lifting member 133 is mounted on the transverse frame 122, and the piston end is connected with the pouring head 132. During operation, the lifting member 133 drives the pouring head 132 to move up and down along the vertical plate 111.

Each part of the wall form unit 1 is prefabricated in a factory, assembled on site, during assembly, the plate main body 11 is erected on the foundation, then the longitudinal ribs 121 are installed, then the transverse ribs 122 are installed to form the framework 12, after the framework 12 is installed, the pouring head 132 and the lifting member 133 are installed, and the pouring head 132 and the pouring pipe 131 are assembled. And after the wall form unit 1 is installed, the column form unit 2 is laid at the corresponding position.

As shown in fig. 1 and 2, the column mold unit 2 includes an arc section 21 and a straight section 22, the arc section 21 matches with the outer diameter of the column to be poured, and the thickness of the straight section 22 matches with the openings of the slots on the two sides of the vertical plate 111; the straight line segment 22 is disposed on two sides of the arc segment 21, and a mounting plate 23 is disposed on a back side of the arc segment 21 for mounting the locking assembly 3. After the prefabrication in the factory is completed, the column formwork units 2 are erected on the foundation and arranged at corresponding positions of the columns when assembled on site, and straight line sections 22 on two sides of each column formwork unit are inserted into slots on two sides of the vertical plate 111 and locked through the locking assemblies 3.

As shown in fig. 1 and 7, the locking assembly 3 includes a fixed nut 31, a lead screw 32, a nut seat 33 and a pull rod 34. A pair of set nuts 31 are provided at the mounting plate 23 on the back side of the arc segment 21. The screw threads at the two ends of the screw rod 32 are opposite in rotating direction, the screw rod 32 is connected between the pair of fixed nuts 31, and a hexagonal prism 35 is arranged outside the screw rod 32 so as to be convenient for clamping by a wrench, so that the rotation of the screw rod 32 is convenient to realize; a pair of nut seats 33 are arranged at two ends of the screw rod 32; one end of the pull rod 34 is connected with the nut seat 33, and the other end is hinged with the lug plate 125 of the framework 12. Thereby completing the connection of the wall form unit 1 and the column form unit 2. During installation, it is guaranteed that the pull rod 34 is in a horizontal state, at the moment, the wall form unit 1 and the column form unit 2 are in a maximum distance state, after installation is completed, the screw rod 32 is rotated, the screw rod 32 drives the pair of nut seats 33 to move relatively, here, because one end of the pull rod 34 connected with the column form unit 2 moves along with the nut seats 33, one end connected with the wall form unit 1 rotates around a hinged shaft, the length of the pull rod 34 is unchanged, the wall form unit 1 is pulled to move towards the column form unit 2, the straight line section 22 of the column form unit 2 slides in the slot of the vertical plate 111 until the pair of nut seats 33 are contacted, at the moment, the wall form unit 1 and the column form unit 2 are in a minimum distance locking state, and therefore connection among all parts is guaranteed to be close and reliable.

All parts of the formwork support system are prefabricated in a factory, the number of units needed to be used is calculated only according to the working conditions on site, standardization is convenient to achieve, the units are prefabricated in the factory and assembled on site, the construction period is shortened, when the units are assembled on site, the wall formwork unit 1 and the column formwork unit 2 are erected on the foundation to be poured, the column formwork unit 2 is inserted into the slot of the wall formwork unit 1 through the straight line sections 22 of the column formwork unit and locked, and a pouring cavity is defined.

As shown in fig. 8, this embodiment further provides a method for constructing a vertical structure by a reverse method, where the method includes the following steps:

s.1, reversely constructing the floor slab, wherein the floor slab comprises a first-poured vertical section, at least 300mm is arranged below the first-poured vertical section, and a pouring hole is reserved in the floor slab.

The method comprises the following steps of (1) reversely constructing a floor slab, wherein the floor slab comprises an upper floor slab, a lower floor slab and a first-pouring vertical structure, the upper floor slab is provided with the first-pouring vertical structure, the first-pouring vertical structure comprises a first-pouring structural column, a first-pouring beam lower wall and a first-pouring beamless lower wall, the upper structure is determined to be downward at least 300mm by comparing 100mm, 200mm and 300mm through field tests according to the requirement of secondary back pouring of the vertical structure and the working condition of cover-digging reverse-acting excavation, so that the secondary pouring construction quality of the vertical structure is ensured, the position of the first-pouring structural column and the position of the first-pouring beam lower wall are both downward at least 300mm, the position of the first-pouring structural column is downward 1500mm in the embodiment, the position of the first-pouring beam lower wall is downward 800mm, and a pouring hole is reserved in the upper floor slab; the method comprises the following steps that four pouring holes are reserved above the side of a first pouring structural column in an upper floor slab, one pouring hole is reserved at each interval of 1000mm on two sides above a lower wall of a first pouring beam in the upper floor slab, and pouring holes are pre-buried right above a beamless lower wall in the upper floor slab; the outer package of the early-pouring structural column is filled with concrete, and the anti-shearing studs are arranged on the early-pouring structural column and used for enhancing the anti-shearing strength of the outer package concrete when the early-pouring structural column is connected.

S.2, erecting a formwork system, and connecting the top end of the shrinkage pipe with an embedded section embedded in the pouring hole.

When the formwork is erected, chiseling is carried out on the bottom surface of the cast vertical structure, binding of reinforcing steel bars is carried out after cleaning, and the formwork is installed after the reinforcing steel bars are concealed and accepted.

S.3, secondary pouring, wherein when the pouring vertical structure is poured to the bottom end of the bell mouth, the pouring head is controlled to move upwards until the bottom end of the bell mouth is flush with the bottom surface of the first-pouring vertical section, and pouring is continued until the pouring vertical structure is higher than the bottom surface of the first-pouring vertical section by more than 300 mm;

the back-built vertical structure comprises a structural column, a shear wall under a beam and a non-beam shear wall;

adopting an over-filling method for the structural column and the shear wall under the beam, uniformly and virtually paving cement mortar with the thickness of 30-50 mm and the same components as the mortar in the concrete on the bottom surface before reinjection;

and (3) performing secondary re-construction on the beamless shear wall by adopting a grouting method, uniformly and virtually paving cement mortar with the thickness of 30-50 mm and the same components as the mortar in the concrete on the bottom surface before re-injection, stopping pouring 50-100 mm below the bottom surface of the lower section during re-injection, treating lower concrete laitance, cleaning the bottom surface of the upper concrete, wetting the base surface, and pouring and tamping again.

And S4, curing, namely curing in time after the concrete is poured, and strictly preventing dehydration and shrinkage cracks.

In the embodiment, the concrete is high-flow low-shrinkage concrete; and the concrete mortar is internal mortar of high-flow-state low-shrinkage concrete.

In the embodiment, five basements are constructed underground, 36 structural columns are arranged on each layer, 52 lower beam walls and 52 lower beamless lower wall walls are arranged on the lower beam walls, 180 structural columns and 260 lower beam walls or beamless lower walls are arranged on the lower beam walls, the vertical structure construction method of the reverse construction method is adopted, after the construction method is adopted, the time for repairing the vertical structure is saved, the calculation is carried out according to the fact that each layer of vertical structure needs 18 working days, and 90 working days are saved for five basements.

The method reasonably solves the quality problem of the horizontal joint of the vertical structure constructed by the reverse construction method, ensures the concrete pouring compactness, effectively and reliably transfers the stress of the vertical structure in the vertical direction at the horizontal joint, and has the advantages of good horizontal joint quality and good force transferring effect; in addition, by adopting the construction method, the time for repairing the vertical structure is saved.

The wall form units and the column form units are prefabricated in a factory, the number of the units needed is calculated according to the field working conditions, standardization is convenient to achieve, the templates are prefabricated in the factory and assembled on the field, the construction period is shortened, when the templates are assembled on the field, the wall form units and the column form units are erected on the positions to be poured on the foundation, the column form units are inserted into the slots of the wall form units through straight line segments of the column form units and locked, and a pouring cavity is defined. During pouring, the stress of the vertical structure at the joint is effectively and reliably transferred through secondary re-pouring, so that the bearing performance is ensured; and through controlling the removal of pouring the head, can reduce the concrete volume that the later stage needs to be handled, can reduce the construction degree of difficulty, improve the efficiency of construction. When adopting traditional horn mouth to pour, can form after pouring and need get rid of with the big assorted concrete of horn mouth size, work load is big, extravagant manpower and materials, and the volume of waiting to get rid of the concrete can be very big reduction in degree through the upgrading of horn mouth.

The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a reverse construction method vertical construction formwork system which characterized in that: the system comprises a wall formwork unit and a column formwork unit;

the wall formwork unit comprises a plate main body, a framework and a lifting casting assembly, wherein slots are formed in two sides of the plate main body, the framework is arranged on the back side of the plate main body, the lifting casting assembly comprises a casting head and a lifting member, one end of the lifting member is connected with the framework, the other end of the lifting member is connected with the casting head, and the lifting member drives the casting head to lift along the height direction of the plate main body;

the plate main body comprises a vertical plate, a bottom rib, a top seat and a base; the top of the vertical plate is provided with a lifting groove, the bottom rib and the top rib are both connected to the back side of the vertical plate and arranged in parallel, the top seat is arranged below the top rib, and the base is arranged on the bottom rib;

the column mould unit comprises an arc-shaped section and straight line sections, and the straight line sections are arranged on two sides of the arc-shaped section;

the column mould unit is inserted into the slot of the wall mould unit by the straight line segment;

the pouring head comprises a flat plate, a bell mouth and a vertical plate, the flat plate comprises a through hole, the flat plate is connected to the large-diameter end of the bell mouth, the small-diameter end of the bell mouth is connected with the vertical plate, and the vertical plate is inserted into the lifting groove;

the lifting component is a hydraulic cylinder, one end of the lifting component is connected with the bell mouth, and the other end of the lifting component is connected with the framework;

the lifting pouring assembly further comprises a pouring pipe; the pouring pipe comprises an embedded section, a contraction section and a connector which are sequentially connected from top to bottom; the pre-buried section is pre-buried in the pre-cast floor slab, and the connector is connected with the flat plate through a flange.

2. The reverse-construction vertical structure formwork system of claim 1, wherein: the top seat is a conical seat, the small-diameter end of the top seat is connected with the top rib, and the inner wall of the top seat is provided with a rubber pad.

3. The reverse-construction vertical structure formwork system of claim 1, wherein: the skeleton comprises a longitudinal bone and a transverse bone; the longitudinal frame is a telescopic frame, the top end of the longitudinal frame is provided with a conical head, the outer wall of the longitudinal frame is provided with a limiting groove, one end of the longitudinal frame is arranged in the base, and the other end of the longitudinal frame is tightly propped against the top seat through the conical head; the transverse bone is arranged in the limit groove and locked by a buckle.

4. The reverse-construction vertical structure formwork system of claim 1, wherein: the system also comprises a locking assembly, wherein the locking assembly comprises a fixed nut, a screw rod, a nut seat and a pull rod; the pair of fixed nuts are respectively arranged on the back sides of the arc-shaped sections; the screw threads at two ends of the screw rod are opposite in rotating direction, and the screw rod is connected between the pair of fixed nuts; the pair of nut seats are arranged at two ends of the screw rod; one end of the pull rod is connected with the nut seat, and the other end of the pull rod is hinged with the framework.

5. A construction method of a vertical structure by a reverse construction method is characterized by comprising the following steps:

s.1, reversely constructing a floor slab, wherein the floor slab comprises a first-pouring vertical section, at least 300mm is arranged below the first-pouring vertical section, and a pouring hole is reserved in the floor slab;

s.2, erecting a formwork system according to any one of claims 1 to 4, and embedding the top end of a pouring pipe into a pouring hole;

s.3, secondary pouring, wherein when the pouring vertical structure is poured to the bottom end of the bell mouth, the pouring head is controlled to move upwards until the bottom end of the bell mouth is flush with the bottom surface of the first-pouring vertical section, and pouring is continued until the pouring vertical structure is higher than the bottom surface of the first-pouring vertical section by more than 300 mm;

and S4, maintaining.

6. The method for constructing the vertical structure by the reverse construction method according to claim 5, wherein: the back-built vertical structure comprises a structural column, a lower beam shear wall and a non-beam shear wall;

the structural columns and the shear walls under the beams are fed by adopting an over-filling method, and cement mortar with the thickness of 30-50 mm and the same components as the mortar in the concrete is uniformly and virtually paved on the bottom surface before reinjection;

the beamless shear wall is built again by grouting method, cement mortar with thickness of 30-50 mm and same composition as that of mortar in concrete is laid on the bottom surface before re-injection, when re-injection, pouring is stopped 50-100 mm below the bottom surface of the lower section, after treating the concrete laitance at the lower part and cleaning the bottom surface of the upper concrete, the base surface is moistened and poured again.

Images