Supporting system of cast-in-place concrete cantilever ring beam formwork and construction method

Abstract

The invention discloses a cast-in-place concrete cantilever ring beam formwork supporting system and a construction method. The cast-in-place concrete cantilever ring beam formwork supporting system comprises a cantilever I-shaped beam, a steel frame system, a ring beam formwork system and a radian adjusting system. The radian adjusting system comprises a supporting leg assembly arranged on the building structure, the supporting leg assembly is provided with an adjustable flower basket vertical rod assembly, the flower basket vertical rod assembly is provided with a connecting disc, the connecting disc is connected with a plurality of adjustable flower basket supporting rods and a plurality of steel wire ropes, and the steel wire ropes are connected with the adjustable flower basket vertical rod assembly. The basket supporting rods and the steel wire ropes are arranged in a staggered mode, and the basket supporting rods and the steel wire ropes are connected to back ridge steel bars on the inner side and the outer side of the ring beam formwork system respectively. The supporting system can effectively control the radian of the concrete arc-shaped beam plate, and the forming appearance quality of the cast-in-place concrete arc-shaped beam plate is improved; and the whole supporting system is not complex in structure, convenient to install, simple in adjusting mode and high in operability, the construction efficiency can be remarkably improved, and the construction quality and the construction safety are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cantilever construction, and particularly to a support system and construction method for a cast-in-situ concrete cantilever ring beam formwork. Background Art

[0002] In the field of construction engineering, a large part of landmark buildings, to meet their aesthetic needs, usually adopt special-shaped concrete structures such as streamline, arc, and ring shapes. Many buildings also show the form of gradually cantilevered outward expansion and inward convergence. This streamline, arc, and ring-shaped exterior design is favored by designers but usually has a high construction difficulty. It is difficult to effectively control the linear control accuracy. If the linear control is improper during construction and the error is too large, it will seriously affect the aesthetics of the building. When the arc control is improper during the binding of the main reinforcement in the beam, it is more likely to cause the quality risk of insufficient concrete cover thickness, and the later repair treatment is difficult and costly. Therefore, how to reduce the construction difficulty of the streamline concrete structure on the premise of ensuring the arc control accuracy of the streamline concrete structure and improving the construction quality and safety is still a construction problem. Summary of the Invention

[0003] The purpose of the present invention is to provide a support system and construction method for a cast-in-situ concrete cantilever ring beam formwork in view of the problem that it is difficult to control the arc of streamline, arc-shaped beam and slab structures in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A support system for a cast-in-situ concrete cantilever ring beam formwork, including a cantilever I-beam arranged on a building structure. A steel frame system is provided on the cantilever I-beam and the building structure, and the steel frame system is used to support the ring beam formwork system. A radian adjustment system for the ring beam formwork system is also provided on the building structure; the radian adjustment system includes a support leg assembly arranged on the building structure. An adjustable flower basket upright rod assembly is provided on the support leg assembly. A connection plate is provided on the flower basket upright rod assembly. The connection plate is connected with a plurality of adjustable flower basket struts and a plurality of steel wires. The flower basket struts and the steel wires are arranged staggeredly. The flower basket struts and the steel wires are respectively connected to the back ribs on the inner and outer sides of the ring beam formwork system.

[0005] The support system of the present cast-in-situ concrete cantilever ring beam formwork can not only support the cantilevered ring beam formwork, but also adjust the radian of the ring beam formwork to meet the design requirements, effectively control the radian of the concrete arc beam and slab, and improve the forming visual quality of the cast-in-situ concrete arc beam and slab; moreover, the entire support system has a simple structure, is easy to install, has a simple adjustment method, and has strong operability, can significantly improve the construction efficiency, and ensure the construction quality and construction safety.

[0006] The flower basket struts are abutted against the back rib steel bars on both sides of the ring beam formwork system. The steel wire ropes apply pre-tension at both ends of the back rib steel bars, which can bend the back rib steel bars so as to lay the formwork along the arc-shaped back rib steel bars, and can also keep the formwork of the ring beam formwork system bent. The present invention uses threaded steel bars as the arc-shaped beam and slab formwork back ribs of the ring beam formwork system, that is, the back rib steel bars. By pre-tensioning the flower basket struts and the steel wire ropes, the threaded steel bars serving as the back ribs can be bent. The number of flower basket struts and steel wire ropes can be increased or decreased according to the arc adjustment needs. The arc can be finely adjusted by simply adjusting the length of the flower basket struts telescopically and tightening or loosening the steel wire ropes, and the arc adjustment accuracy is relatively high. By increasing the number of the arc adjustment systems, the arc adjustment of the formwork of the multi-segment arc-shaped cast-in-place concrete structure can be completed, and it has extremely strong applicability.

[0007] Further, the cantilever I-beam is connected to the lower structure of the building structure through a plurality of first embedded parts, and an open-angle steel and a nut are connected to the first embedded parts.

[0008] Further, the steel frame system includes a plurality of steel pipe main ribs arranged horizontally, vertically and longitudinally. An adjustable support is provided on the vertical steel pipe main ribs. A top-layer steel pipe in the horizontal direction is provided on the adjustable support. A plurality of wooden rib back ribs are provided on the top-layer steel pipe, and the wooden rib back ribs are used to support the ring beam formwork system.

[0009] Further, the ring beam formwork system includes a transverse beam and slab part formwork and an arc beam and slab part formwork. The arc beam and slab part formwork includes an inner formwork, an outer formwork, and a bottom formwork connected to the inner formwork and the outer formwork. The inner formwork and the outer formwork are connected by a plurality of tie bolts. A precast support is further provided between the inner walls of the inner formwork and the outer formwork, and the precast support is arranged corresponding to the flower basket struts; A plurality of the back rib steel bars are respectively provided on the outer walls of the inner formwork and the outer formwork.

[0010] Further, the back rib steel bars include at least upper, middle and lower layers. The middle-layer back rib steel bars are connected to the flower basket struts, and the upper and lower-layer back rib steel bars are respectively connected to the steel wire ropes.

[0011] Further, the connecting plate is a disc or a multi-angle disc, and a plurality of connecting holes are provided on the connecting plate; At least three groups of the flower basket struts are arranged and distributed in the middle area; The steel wire ropes are connected to the two side areas. Each side area includes at least two strands of steel wire ropes. Each strand of the steel wire ropes is wound around the connecting holes and then the two ends are separated and connected to the inner and outer sides of the ring beam formwork system.

[0012] Furthermore, the supporting leg assembly includes a pair of inclined supporting leg rods, the pair of supporting leg rods are connected by a first basket bolt, the upper supporting leg rod is connected to the basket upright rod assembly, and the lower supporting leg rod is connected to a supporting leg pad via a connecting member, and the supporting leg pad is connected to the building structure via a second embedded member.

[0013] Furthermore, the flower basket upright assembly includes an upper upright and a lower upright, and the upper upright and the lower upright are connected by a second flower basket bolt; a plurality of connecting ears are provided on the outer periphery of the lower end of the lower upright for connecting the supporting leg assembly, and the connecting plate is connected to the upper upright.

[0014] Furthermore, the flower basket strut includes a first strut and a second strut, the first strut and the second strut are connected by a third flower basket bolt, the end of the first strut is connected to the connecting plate, and the end of the second strut is provided with a supporting structure and connected to the back-flanged steel bar.

[0015] A construction method for a support system of a cast-in-place concrete cantilever ring beam formwork, the construction method comprising the following steps: Embedded parts installation: installing a plurality of first embedded parts and second embedded parts according to preset positions before pouring concrete of the building structure; Installation of cantilevered I-beam: When the lower concrete structure of the building structure reaches the design strength, the cantilevered I-beam is installed. After the cantilevered I-beam is placed in place, it is connected to the first embedded part by using perforated angle steel and nuts; After the cantilever I-beam is installed, the ring beam formwork system is erected, the steel frame system is erected on the building structure and the cantilever I-beam, a wooden back rib is arranged on the steel frame system, a transverse beam slab formwork and a part of the arc beam slab formwork are arranged on the wooden back rib, and the back rib reinforcement is preset; Installation of the curvature adjustment system: installing the support leg assembly on the building structure, installing the flower basket upright pole assembly on the support leg assembly, installing the connecting plate on the flower basket upright pole assembly, connecting the flower basket support pole and the steel wire rope through the connecting plate, the other end of the flower basket support pole is connected to the back rib steel bar, the two ends of the steel wire rope are respectively connected to the curved beam plate template, and at least one section of the steel wire rope is reserved for curvature adjustment; The arc of the arc beam slab template is adjusted: the basket support rod is abutted against the back rib steel bars in the middle area of ​​the arc beam slab template, and the steel wire rope is used to pre-tension the two ends of the arc beam slab template, so that the back rib steel bars and the arc beam slab template present the basic arc required by the arc beam, and the arc is basically formed and fine-tuned until the arc design requirements are met; After the formwork of the arc-shaped beam and slab part is adjusted, prefabricated support members are arranged and connected inside the formwork of the arc-shaped beam and slab part, and then steel bar binding is carried out; after the steel bar binding is completed, formwork closing and reinforcement operations are carried out.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The support system of the present in-situ concrete cantilevered ring beam formwork can not only support the cantilevered ring beam formwork, but also adjust the radian of the ring beam formwork to meet the design requirements, effectively control the radian of the concrete arc-shaped beam and slab, and improve the forming visual quality of the in-situ concrete arc-shaped beam and slab; moreover, the entire support system has a simple structure, is easy to install, has a simple adjustment method, and has strong operability, which can significantly improve the construction efficiency and ensure the construction quality and construction safety; 2. The setting of the support leg assembly and the flower basket vertical rod assembly can securely and stably fix the entire radian adjustment system on the building structure, providing a stable cantilever support foundation, and both of these assemblies can be adjusted in height and angle, with strong adaptability and versatility; the connection plate not only serves as a connecting component, which can connect multiple flower basket struts and steel wire ropes at the same time, but also serves as a force transmission component, which can conduct the forces of the flower basket struts and steel wire ropes, enabling the two to play a role in radian adjustment; 3. The present invention uses threaded steel bars as the back ribs of the arc-shaped beam and slab formwork of the ring beam formwork system, that is, the back rib steel bars, and uses the pre-tension of the flower basket struts and the steel wire ropes to bend the threaded steel bars serving as the back ribs. The number of flower basket struts and steel wire ropes can be increased or decreased according to the radian adjustment needs. The radian can be finely adjusted by simply adjusting the length of the flower basket struts and loosening or tightening the steel wire ropes, etc. The radian adjustment accuracy is relatively high; by increasing the number of the radian adjustment systems, the radian adjustment of the formwork of multiple arc-shaped in-situ concrete structures can be completed, with extremely strong applicability; 4. The bearing capacity of this support system is also relatively strong, and the damage to the original structure is small: the radian adjustment system of the present invention is fixed on the original structural slab through expansion bolts or embedded steel bars. When adjusting the radian, there is almost no damage to the original structure, the deformation of the adjustment system is extremely small, and it can also withstand the forces generated on the entire adjustment system during radian adjustment, with high bearing capacity and strong stability, reducing construction risks and ensuring construction quality; 5. This support system also has good economic benefits. In addition to the economic benefits brought by improving construction efficiency and construction quality, most of its components can be recycled, such as the steel frame system, formwork, and the support feet, vertical rods, flower basket struts, steel wire ropes, threaded steel bars, etc. of the radian adjustment system, which can all be used as recycled materials and effectively shorten the construction period, improving economic benefits. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the support system of an in-situ concrete cantilevered ring beam formwork of the present invention; Figure 2 It is a layout diagram of the steel pipe system in the support system of the present invention; Figure 3 Schematic diagram of the radian adjustment system in the support system of the present invention; Figure 4 Partial enlarged structural schematic diagram of the ring beam formwork system in the support system of the present invention; Figure 5 Top view structural schematic diagram of the support system of a cast-in-situ concrete cantilever ring beam formwork of the present invention; Figure 6 Top view structural schematic diagram of the connection disc of the radian adjustment system of the present invention; In the figure: 1, cantilever I-beam; 2, steel frame system; 201, main steel pipe; 202, adjustable support; 203, top layer steel pipe; 204, wooden back lining; 3, ring beam formwork system; 301, transverse beam and slab formwork; 302, arc beam and slab formwork; 4, support leg assembly; 401, support leg rod; 402, first turnbuckle; 403, leg bearing plate; 5, turnbuckle vertical rod assembly; 501, upper vertical rod; 502, lower vertical rod; 503, second turnbuckle; 504, connection ear; 6, connection disc; 601, connection hole; 7, turnbuckle strut; 701, first strut; 702, second strut; 703, third turnbuckle; 8, steel wire rope; 9, back lining steel bar; 10, first embedded part; 11, second embedded part; 12, inner formwork; 13, outer formwork; 14, bottom formwork; 15, tie rod; 16, precast fixing part; 17, precast support part. Detailed implementation manners

[0018] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work conditions belong to the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Embodiment 1

[0020] As Figures 1 to 3As shown in the figure, a support system for a cast-in-place concrete cantilever ring beam formwork includes a cantilever I-beam 1 arranged on a building structure. A steel frame system 2 is provided between the cantilever I-beam 1 and the building structure, and the steel frame system 2 is used to support the ring beam formwork system. A radian adjustment system for adjusting the radian of the ring beam formwork system is also provided on the building structure. The radian adjustment system includes a support leg assembly 4 arranged on the building structure. An adjustable flower basket vertical rod assembly 5 is provided on the support leg assembly 4. A connecting plate 6 is provided on the flower basket vertical rod assembly 5. The connecting plate 6 is connected with a plurality of adjustable flower basket struts 7 and a plurality of steel wire ropes 8. The flower basket struts 7 and the steel wire ropes 8 are arranged staggeredly. The flower basket struts 7 and the steel wire ropes 8 are respectively connected to the back ribs 9 on the inner and outer sides of the ring beam formwork system.

[0021] The support system of this cast-in-place concrete cantilever ring beam formwork can not only support the cantilever ring beam formwork, but also adjust the radian of the ring beam formwork to meet the design requirements, effectively control the radian of the concrete curved beam and slab, and improve the forming visual quality of the cast-in-place concrete curved beam and slab. Moreover, the entire support system has a simple structure, is easy to install, has a simple adjustment method, and has strong operability, which can significantly improve the construction efficiency and ensure the construction quality and safety.

[0022] The building structure can be an existing structure or the lower ring beam slab structure fabricated by the previous installation of this method. As a cantilever support component, the cantilever I-beam 1 can support the steel frame system together with the building structure, and the steel frame system 2 can be used to support the upper formwork, that is, the formwork of the ring beam formwork system. This support structure is convenient to set up, easy to construct, and has high safety.

[0023] The ring beam formwork system is mainly used to form the concrete ring beam structure. Since it is an arc structure and has high requirements for the radian, a general formwork cannot meet the requirements. Through the setting of the radian adjustment system, the radian of the ring beam formwork system can be controlled and adjusted. The settings of the support leg assembly 4 and the flower basket vertical rod assembly 5 can securely and stably fix the entire radian adjustment system on the building structure, providing a stable cantilever support foundation. Moreover, both of these two assemblies can be adjusted in height and angle, with strong adaptability and versatility. The connecting plate 6 not only serves as a connecting component, which can connect a plurality of flower basket struts 7 and steel wire ropes 8 at the same time, but also serves as a force transmission component, which can conduct the forces of the flower basket struts 7 and the steel wire ropes 8, enabling both of them to play a role in radian adjustment.

[0024] The basket struts 7 are abutted against the back ribs 9 on both sides of the ring beam formwork system, and the steel wire ropes 8 apply pre-tensioning force to both ends of the back ribs 9, which can bend the back ribs 9 so as to lay the formwork along the arc-shaped back ribs 9, and also keep the formwork of the ring beam formwork system bent. The present invention uses threaded steel bars as the back ribs of the arc-shaped beam plate formwork of the ring beam formwork system, that is, the back ribs. The basket struts 7 and the steel wire ropes 8 are used to pre-tension the threaded steel bars as the back ribs to bend. The number of basket struts and steel wire ropes can be increased or decreased according to the need for curvature adjustment. The curvature can be precisely adjusted by simple methods such as telescopically adjusting the length of the basket struts 7 and tightening the steel wire ropes 8, and the curvature adjustment accuracy is relatively high. By increasing the number of curvature adjustment systems, the curvature adjustment of multi-section arc-shaped cast-in-place concrete structure formwork can be completed, which has extremely strong applicability.

[0025] This support system also has a strong bearing capacity and causes little damage to the original structure: the curvature adjustment system of the present invention is fixed to the original structural plate by expansion bolts or embedded steel bars. There is almost no risk of damage to the original structure when the curvature is adjusted, and the adjustment system is deformed very little. It can also withstand the force generated on the entire adjustment system during the curvature adjustment. It has high bearing capacity and strong stability, reduces construction risks and ensures construction quality.

[0026] This support system also has good economic benefits. In addition to providing economic benefits brought by construction efficiency and construction quality, most of its components can be used in rotation. For example, the steel frame system, formwork, and the supporting feet, uprights, flower basket struts, wire ropes, threaded steel bars, etc. of the curvature adjustment system can all be used as turnover materials and effectively shorten the construction period and improve economic benefits.

[0027] Furthermore, the cantilevered I-beam 1 is connected to the lower structure of the building structure through a plurality of first embedded parts 10, and the first embedded parts 10 are connected with perforated angle steels and nuts.

[0028] By setting the first embedded part 10, in cooperation with the perforated angle steel and the nut, the cantilever I-beam can be conveniently connected and fixed, so that one end of the cantilever I-beam extends outward from the building structure to safely support the steel frame system outside the building structure.

[0029] Furthermore, the steel frame system 2 includes a plurality of steel pipe main ribs 201 arranged longitudinally, horizontally and vertically, the vertical steel pipe main ribs 201 are provided with adjustable supports 202, the adjustable supports 202 are provided with horizontal top steel pipes 203, the top steel pipes 203 are provided with a plurality of wooden beam back ribs 204, and the wooden beam back ribs 204 are used to support the ring beam formwork system 3.

[0030] The adjustable support 202 can not only effectively support these top steel pipes 203, but also appropriately adjust the support height to finely adjust the positions of these top steel pipes 203 so as to better support these wooden joist back braces 204, which are the main structures for supporting the formwork of the ring beam formwork system.

[0031] Further, as shown in Figure 4 FIG. 5, the ring beam formwork system 3 includes a transverse beam and slab part formwork 301 and an arc beam and slab part formwork 302. The arc beam and slab part formwork 302 includes an inner formwork 12, an outer formwork 13, and a bottom formwork 14 connected to the inner formwork 12 and the outer formwork 13. A plurality of tie rods 15 are connected between the inner formwork 12 and the outer formwork 13. A prefabricated support 17 is further provided between the inner walls of the inner formwork 12 and the outer formwork 13, and the prefabricated support 17 is arranged corresponding to the flower basket strut 7; a plurality of the back rib steel bars 9 are respectively provided on the outer walls of the inner formwork 12 and the outer formwork 13.

[0032] For the entire cantilever ring beam, it not only includes the arc beam at the outermost extension, but also includes the beam and slab in the horizontal transverse part. During the forming process, the key is to control the radian of the arc beam part, that is, the structural radian formed by the arc beam and slab part formwork 302. The inner formwork, the outer formwork, and the bottom formwork can form a basic model frame structure, and can be connected and fixed by the tie rods.

[0033] The arrangement of the back rib steel bars 9 can, on the one hand, bear the vertical and horizontal forces from the formwork, significantly improve the bearing capacity and stiffness of the formwork, enable it to bear greater pressure and weight, prevent the formwork from deforming or losing stability during the force application process, and improve the bearing capacity and safety of the structure; on the other hand, the back rib steel bars 9 can be used to adjust the radian of the formwork. The back rib steel bars 9 will bend and deform during the radian adjustment process to lay the formwork along its radian, and can also drive the ring beam formwork to reach the preset radian.

[0034] The nominal diameter of the back rib steel bars 9 should not be less than 25 mm. When splicing, binding lap joint and lap welding can be adopted, and butt welding is not suitable.

[0035] The prefabricated support 17 can not only form a support structure between the inner and outer formworks, but also be connected to the main beam reinforcement (the reinforcement bound inside the formwork), and corresponds to the flower basket strut 7. During the radian adjustment, it can transfer the force generated during the arc bending, so that the main beam reinforcement has the same radian as the formwork.

[0036] Preferably, the templates used in the ring beam formwork system, such as these inner templates, outer templates and bottom templates, can all adopt 15-mm plywood. When connecting the tie bolts, prefabricated fixing parts (such as fixing plates, fixing rods, etc.) can also be arranged outside the inner and outer backrest reinforcing bars. The tie bolts pass through the prefabricated connecting parts and are then locked by nuts, which can improve the integrity and have better connection strength.

[0037] Furthermore, as shown in Figure 5 and Figure 6 , the backrest reinforcing bar 9 at least includes upper, middle and lower layers. The middle backrest reinforcing bar 9 is connected to the flower basket strut 7, and the upper and lower backrest reinforcing bars 9 are respectively connected to the steel wire ropes 8. Through such a setting, a more reasonable force structure can be formed, enabling the flower basket strut and the steel wire ropes to better adjust the arc.

[0038] Furthermore, the connecting plate 6 is a disc or a multi-angle disc, and a plurality of connecting holes 601 are provided on the connecting plate 6; at least three groups of the flower basket struts 7 are arranged in the middle area; the steel wire ropes 8 are connected to the two side areas, and each side area includes at least two strands of steel wire ropes 8. Each strand of the steel wire rope 8 is wound around the connecting hole and then the two ends are separated and connected to the inner and outer sides of the ring beam formwork system.

[0039] The central axis of the connecting plate 6 coincides with the central axis of the flower basket vertical rod assembly 5, and is also in the plane of the central bisector of this curved beam slab. The three flower basket struts are arranged in the middle, one of which is arranged in the exact middle, and the two are symmetric on both sides of the central bisector, and the included angle between them can be 30-70 degrees; multiple strands of steel wire ropes are sequentially connected at intervals towards both ends. For example, steel wire ropes are respectively connected at both ends of this curved beam, and another strand of steel wire rope is connected in the area between the end and the flower basket strut.

[0040] Furthermore, the support leg assembly 4 includes a pair of support leg rods 401 arranged obliquely. A first flower basket bolt 402 is connected between the pair of support leg rods 401. The upper support leg rod 401 is connected to the flower basket vertical rod assembly 5. The lower support leg rod 401 is connected with a leg cushion plate 403 through a connecting piece, and the leg cushion plate 403 is connected to the building structure through a second embedded part 11.

[0041] In this application, there are three support leg assemblies 4, which jointly connect and support the flower basket vertical rod assembly 5; both of the pair of support leg rods 401 can be adjusted in length through the first flower basket bolt 402. The leg cushion plate 403 can increase the support area, be firmly fixed to the completed structure, and does not displace or deform during the adjustment of the arc of the ring beam formwork and the arc of the main beam reinforcement, and it is also convenient to connect to the second embedded part 11 through the open-angle steel and nuts.

[0042] Furthermore, the flower basket upright assembly 5 includes an upper upright 501 and a lower upright 502, and the upper upright 501 and the lower upright 502 are connected by a second flower basket bolt 503; a plurality of connecting ears 504 are provided on the outer periphery of the lower end of the lower upright 502 for connecting to the supporting leg assembly 4, and the connecting plate 6 is connected to the upper upright 501.

[0043] The length of the upper upright 501 and the lower upright 502 can also be adjusted by the second turnbuckle bolt 503. The connection ear 504 is provided to facilitate the circumferential connection of the supporting leg rods 401. The connection plate can be locked on the upper upright.

[0044] Furthermore, the flower basket strut 7 includes a first strut 701 and a second strut 702, and the first strut 701 and the second strut 702 are connected by a third flower basket bolt 703 so as to perform telescopic adjustment on the flower basket strut 7; the end of the first strut 701 is clamped on the connecting plate 6 and is fixed to the connecting plate 6 by bolts, and the end of the second strut 702 is provided with a fork-shaped supporting structure and is connected to the back-flanged steel bar 9, which can better abut or be connected to the outer peripheral surface of the back-flanged steel bar.

[0045] The arc adjustment system composed of the supporting leg assembly 4, the flower basket upright assembly 5, the connecting plate 6, the flower basket support rod 7 and the steel wire rope 8 can make the main reinforcement in the cast-in-place concrete arc beam have a certain prestress. Prestress analysis needs to be carried out before implementation to avoid affecting the structural safety. After the concrete is poured, the mold can be removed only when the concrete has a certain strength to avoid the prestress of the main reinforcement of the beam from damaging the concrete. These parts can adjust their installation position and height according to actual needs, are minimally affected by site conditions, have strong applicability and can be used cyclically. Example 2

[0046] A construction method for a support system of a cast-in-place concrete cantilever ring beam formwork, the construction method comprising the following steps: S1: Embedded parts installation: installing a plurality of first embedded parts and second embedded parts according to preset positions before pouring concrete of the building structure; Specifically, the first embedded parts and the second embedded parts are round steels with threads embedded in the concrete when pouring concrete, and are used to fix the cantilevered I-beam and the leg pads. For the convenience of transportation and construction efficiency, the first and second embedded parts are usually welded on site. To ensure the quality of anchoring, the anchoring round steel must be effectively connected to the original structural plate reinforcement. The installation of the first and second embedded parts must be completed before pouring concrete.

[0047] S2: Installation of the cantilever I-beam: Install the cantilever I-beam when the lower concrete structure of the building structure reaches the design strength. After the cantilever I-beam is placed in place, connect it to the first embedded part using the perforated angle steel and nuts.

[0048] S3: After the installation of the cantilever I-beam is completed, erect the ring beam formwork system. Erect the steel frame system on the building structure and the cantilever I-beam, set the wooden furring strips on the steel frame system, set the horizontal beam and slab formwork and part of the curved beam and slab formwork on the wooden furring strips, and set the back-up bars on the inner and outer sides of the preset curved beam and slab formwork for the adjustment and control of the curved beam and slab radian.

[0049] S4: Installation of the radian adjustment system: Install the support leg assembly on the building structure, install the flower basket upright rod assembly on the support leg assembly, install the connecting plate on the flower basket upright rod assembly, connect the flower basket strut and the steel wire rope through the connecting plate, connect the other end of the flower basket strut to the back-up bar, and connect the two ends of the steel wire rope to the curved beam and slab formwork respectively. At least a section of the steel wire rope is reserved for radian adjustment.

[0050] S5: Adjust the radian of the curved beam and slab formwork: The flower basket strut abuts against the back-up bar at the middle area position of the curved beam and slab formwork, and pre-tension the steel wire rope at both ends of the curved beam and slab formwork to make the back-up bar and the curved beam and slab formwork present the basic radian required for the curved beam. Fine-tune after the basic arc is formed until the arc design requirements are met; Specifically, after placing the 15-mm-thick plywood in place, install the flower basket strut at the middle position of the curved beam and slab to fix the threaded steel bar used as the back-up bar. Use the steel wire rope to pre-tension the threaded steel bar used as the back-up bar at both ends of the curved beam and slab to make it present the basic radian required for the curved beam. After the basic arc is formed, add the flower basket strut and the steel wire rope as needed for more detailed radian adjustment until the arc design requirements are met. A certain length of the steel wire rope is reserved for the radian adjustment of the main beam bars. After the radian adjustment of the back-up bar meets the requirements, tightly fix the 15-mm-thick plywood (inner and outer formwork) on the back-up bar to make the formwork have the same radian as the threaded steel bar.

[0051] S6: After the adjustment of the curved beam and slab formwork is completed, install the precast support members inside the curved beam and slab formwork and carry out steel bar binding; specifically, after the radian adjustment of the formwork on one side of the curved beam and slab is completed, adjust the radian of the main beam bars in the same way as the back-up bar. Use the concrete precast support members to transfer the force generated during the bending of the arc inside the formwork at the position where the flower basket strut is installed to make the main beam bars have the same radian as the formwork.

[0052] S7: After the steel bars are tied, formwork closing and reinforcement operations are carried out. After the steel bars in the cast-in-place concrete curved beam are tied, formwork can be closed on the other side of the beam. The curvature of the outer formwork is adjusted by using the pre-reserved steel wire ropes (12), precast support members and backing bar steel bars in the early stage. After formwork closing, steel pipes and tie rods are used for fixation in a timely manner.

[0053] By adopting the above construction method, the curvature is adjusted by using backing bar steel bars, flower basket struts and steel wire ropes, and then the formwork is fixed on the backing bar steel bars with a curvature, so that the concrete poured in the formwork has a pre-adjusted curvature to meet the requirements of design aesthetics. The invention effectively solves the problem that the curvature of the curved structure is difficult to effectively control, greatly improves the forming visual quality of the curved beam and slab, improves the construction quality and reduces the construction risk.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A support system for a cast-in-place concrete cantilever ring beam formwork, characterized in that: It includes a cantilevered I-beam arranged on a building structure, the cantilevered I-beam and the building structure are provided with a steel frame system, the steel frame system is used to support a ring beam formwork system, and the building structure is also provided with an arc adjustment system for adjusting the arc of the ring beam formwork system; the arc adjustment system includes a support leg assembly arranged on the building structure, the support leg assembly is provided with an adjustable flower basket upright pole assembly, the flower basket upright pole assembly is provided with a connecting plate, the connecting plate is connected with a plurality of adjustable flower basket support poles and a plurality of steel wire ropes, the flower basket support poles and the steel wire ropes are staggered, and the flower basket support poles and the steel wire ropes are respectively connected to the back-corrugated steel bars inside and outside the ring beam formwork system.

2. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1 is characterized in that: The cantilevered I-beam is connected to the lower structure of the building structure through a plurality of first embedded parts, and the first embedded parts are connected with perforated angle steels and nuts.

3. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1 is characterized in that: The steel frame system includes a plurality of steel pipe main ribs arranged longitudinally, transversely and vertically, the vertical steel pipe main ribs are provided with adjustable supports, the adjustable supports are provided with horizontal top steel pipes, the top steel pipes are provided with a plurality of wooden beam back ribs, and the wooden beam back ribs are used to support the ring beam formwork system.

4. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The ring beam formwork system includes a transverse beam slab formwork and an arc-shaped beam slab formwork, the arc-shaped beam slab formwork includes an inner formwork, an outer formwork, and a bottom formwork connected to the inner formwork and the outer formwork, the inner formwork and the outer formwork are connected by a plurality of tension screws, and a prefabricated support member is further provided between the inner walls of the inner formwork and the outer formwork, and the prefabricated support member is arranged corresponding to the basket support rod; the outer walls of the inner formwork and the outer formwork are respectively provided with a plurality of back-corrugated steel bars.

5. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The back-flanged steel bars at least include an upper layer, a middle layer and a lower layer. The back-flanged steel bars in the middle layer are connected to the flower basket support rods, and the back-flanged steel bars in the upper and lower layers are respectively connected to the steel wire ropes.

6. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The connecting plate is a circular plate or a polygonal plate, and is provided with a plurality of connecting holes; the flower basket support rods are provided with at least three groups, which are distributed in the middle area; the steel wire rope is connected to the two side areas, and each side area includes at least two steel wire ropes, and each steel wire rope is wound around the connecting hole and its two ends are separately connected to the inner and outer sides of the ring beam formwork system.

7. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The supporting leg assembly includes a pair of inclined supporting leg rods, the pair of supporting leg rods are connected by a first basket bolt, the upper supporting leg rod is connected to the basket upright rod assembly, and the lower supporting leg rod is connected to a supporting leg pad via a connecting piece, and the supporting leg pad is connected to the building structure via a second embedded part.

8. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The flower basket upright rod assembly includes an upper upright rod and a lower upright rod, and the upper upright rod and the lower upright rod are connected by a second flower basket bolt; a plurality of connecting ears are provided on the outer periphery of the lower end portion of the lower upright rod for connecting the supporting leg assembly, and the connecting plate is connected to the upper upright rod.

9. The support system of the cast-in-place concrete cantilever ring beam formwork according to claim 1, characterized in that: The flower basket strut includes a first strut and a second strut, the first strut and the second strut are connected by a third flower basket bolt, the end of the first strut is connected to the connecting plate, and the end of the second strut is provided with a supporting structure and connected to the back-flanged steel bar.

10. A construction method for a support system of a cast-in-place concrete cantilever ring beam formwork according to any one of claims 1 to 9, characterized in that: The construction method comprises the following steps: Embedded parts installation: installing a plurality of first embedded parts and second embedded parts according to preset positions before pouring concrete of the building structure; Installation of cantilevered I-beam: When the lower concrete structure of the building structure reaches the design strength, the cantilevered I-beam is installed. After the cantilevered I-beam is placed in place, it is connected to the first embedded part by using perforated angle steel and nuts; After the cantilever I-beam is installed, the ring beam formwork system is erected, the steel frame system is erected on the building structure and the cantilever I-beam, a wooden back rib is arranged on the steel frame system, a transverse beam slab formwork and a part of the arc beam slab formwork are arranged on the wooden back rib, and the back rib reinforcement is preset; Installation of the curvature adjustment system: installing the support leg assembly on the building structure, installing the flower basket upright pole assembly on the support leg assembly, installing the connecting plate on the flower basket upright pole assembly, connecting the flower basket support pole and the steel wire rope through the connecting plate, the other end of the flower basket support pole is connected to the back rib steel bar, the two ends of the steel wire rope are respectively connected to the curved beam plate template, and at least one section of the steel wire rope is reserved for curvature adjustment; The arc of the arc beam slab template is adjusted: the basket support rod is abutted against the back rib steel bars in the middle area of ​​the arc beam slab template, and the steel wire rope is used to pre-tension the two ends of the arc beam slab template, so that the back rib steel bars and the arc beam slab template present the basic arc required by the arc beam, and the arc is basically formed and fine-tuned until the arc design requirements are met; After the adjustment of the arc-shaped beam slab formwork is completed, prefabricated support members are set in the arc-shaped beam slab formwork for connection and reinforcement is performed; after the reinforcement is tied, the formwork is sealed and reinforced.

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