Arc-shaped steel formwork for cantilever balcony of fourth-generation residential building

Abstract

The fourth-generation residential building cantilever balcony arc-shaped steel formwork comprises an arc-shaped formwork body and a worm rotationally connected with the outer convex side of the arc-shaped formwork body, the worm is in threaded connection with a first sliding block in a screwed mode, and the first sliding block is hinged to one end of a traction rod; the other end of the traction rod is hinged with the outer convex side of the arc-shaped template main body; and at least one pair of traction rods are symmetrically distributed on the two sides of the worm. The arc-shaped steel formwork for the cantilever balcony of the fourth-generation residential building has the beneficial effects that the curvature of the arc-shaped steel formwork can be steplessly adjusted according to construction requirements, so that the construction requirements of various arc streamline-shaped panoramic balconies with complex shapes are met, arc-shaped steel formworks with various curvature models do not need to be configured, the construction cost is reduced, and the construction efficiency is improved. The cost reduction and efficiency improvement are obvious.

Description

Technical Field

[0001] The invention relates to the field of fourth-generation residential buildings, in particular to an arc-shaped steel formwork for a cantilevered balcony of a fourth-generation residential building. Background Art

[0002] The fourth generation of housing is a new type of housing that integrates multiple architectural advantages. It aims to combine nature with the living environment to create a more comfortable, environmentally friendly and humane living space. Compared with the current common traditional housing, a notable feature of the fourth generation of housing is the large cantilevered balcony. The appearance of the balcony is no longer limited to the traditional square shape, but has added curved shapes such as round, oval, and irregular curved surfaces. It is foreseeable that the arc-shaped panoramic balcony will become the standard of the fourth generation of high-end housing.

[0003] Compared with the traditional square cantilever balcony, the panoramic balcony with arc streamlined facade is more complicated from design to construction, and the requirements for design and construction are also relatively high. For example, the arc steel formwork used in the construction of the cantilever balcony, the curvature of the arc steel formwork currently used is fixed, and the outer wall of the arc streamlined panoramic balcony has multiple curved surfaces with different curvatures, so it is necessary to equip it with a variety of arc steel formworks with different curvatures. Moreover, as the shape of the arc streamlined panoramic balcony becomes more and more complex, the number of curved surfaces with different curvatures on the outer wall of the balcony increases, requiring the construction party to equip it with more curvature models of arc steel formworks, which not only has a high purchase cost, but also some of the purchased unpopular curvature models of arc steel formworks are not used frequently in the later stage, which is not conducive to the construction party to reduce costs and increase efficiency. Summary of the invention

[0004] The main purpose of the invention is to propose a fourth-generation arc-shaped steel formwork for cantilevered balconies in residential buildings, aiming to solve the problem that the curvature of the existing arc-shaped steel formwork for cantilevered balconies cannot be adjusted.

[0005] In order to solve the above problems, the present invention proposes a fourth-generation arc-shaped steel formwork for cantilevered balconies of residential buildings, comprising an arc-shaped formwork body and a worm screwedly connected to the convex side of the arc-shaped formwork body, wherein the worm screw thread is screwed with a slider 1, the slider 1 is hinged to one end of a traction rod, and the other end of the traction rod is hinged to the convex side of the arc-shaped formwork body; There is at least one pair of traction rods, which are symmetrically distributed on both sides of the worm.

[0006] In one embodiment, the middle portion of the outer convex side of the arc-shaped template body is rotatably connected to one end of the worm, and the two ends of the outer convex side of the arc-shaped template body are hinged to the traction rod.

[0007] In one embodiment, the worm is perpendicular to the curved surface where the middle portion of the convex side of the arc-shaped template body is located.

[0008] In one embodiment, one end of the worm is rotatably connected to a mounting seat, and the mounting seat is fixedly connected to the outer convex side of the arc-shaped template body; The lower end of the mounting seat is fixedly connected with an electromagnet, and the lower surface of the electromagnet is flush with the lower surface of the arc-shaped template body.

[0009] In one embodiment, a slip ring is slidably mounted on the worm along the axial direction of the worm, and a distance measuring device is provided on the mounting seat, and the distance measuring device is used to measure the distance from the worm to the slip ring; A laser is fixedly installed in an area near the other end of the traction rod on the outer convex side of the arc-shaped template body, and the laser line emitted by the laser can be projected onto the slip ring.

[0010] In one embodiment, a worm wheel connected to a worm gear transmission is rotatably mounted on the slider one, screw rods coaxial with the worm wheel are fixedly mounted on both sides of the worm wheel, and a slider two is threadedly connected to the screw rods. The rotation of the worm wheel drives a pair of sliders two to approach or move away from each other, contact or separate from the traction rod, and the rotation of the worm wheel drives a pair of sliders two to approach each other, contact the traction rod and continuously squeeze the traction rod and slide close to the traction rod, thereby pushing the traction rod to rotate around the slider one.

[0011] In one embodiment, a slot is provided on the sliding block 2, and the traction rod slides through the slot.

[0012] In one embodiment, a ball is self-rollingly installed in the slot, a slide groove extending along the length direction of the traction rod is provided on the traction rod, the ball extends into the slide groove, and the traction rod moves in the slot to drive the ball to roll in the slide groove.

[0013] In one embodiment, sealing strips are installed at both circumferential ends of the arc-shaped template body.

[0014] In one embodiment, a protrusion is provided on the side of the sealing strip facing away from the arc-shaped template body, and a cavity is provided inside the sealing strip.

[0015] Beneficial effects: The fourth-generation arc-shaped steel formwork for the cantilevered balcony of residential buildings of the present application can steplessly adjust the curvature of the arc-shaped steel formwork according to construction requirements, thereby meeting the construction needs of various complex arc-shaped streamlined panoramic balconies. There is no need to configure arc-shaped steel formworks with multiple curvature models, which reduces construction costs and significantly reduces costs and increases efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the arc-shaped steel formwork for the cantilevered balcony of the fourth generation residential building of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the arc-shaped steel formwork for the cantilevered balcony of the fourth generation residential building of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the arc-shaped steel formwork for the cantilevered balcony of the fourth generation residential building of the present invention. Figure 3 ; Figure 4 It is a top view of the arc-shaped steel formwork of the cantilevered balcony of the fourth generation residential building of the present invention; Figure 5 yes Figure 4 A magnified view of part B in FIG. Figure 6 This is a schematic diagram of the structure of the arc-shaped steel formwork for the cantilevered balcony of the fourth generation residential building of the present invention. Figure 4 ; Figure 7 yes Figure 6 Enlarged view of part A in .

[0018] The following are the descriptions of the reference numerals: 1. Arc-shaped template body; 2. Mounting seat; 3. Worm; 4. Socket; 5. Connecting column; 6. Electromagnet; 7. Slider 1; 8. Screw 1; 9. Screw 2; 10. Worm gear; 11. Mounting hole; 12. Slider 2; 13. Slot; 14. Drawbar; 15. Rod seat; 16. Laser; 17. Laser line; 18. Slip ring; 19. Distance measuring device; 20. Slide; 21. Ball; 22. Sealing strip; 23. Protrusion; 24. Cavity. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The present invention proposes a fourth-generation arc-shaped steel formwork for cantilevered balconies in residential buildings. The fourth-generation arc-shaped steel formwork for cantilevered balconies in residential buildings can steplessly adjust the curvature of the arc-shaped steel formwork according to construction requirements, thereby meeting the construction requirements of various complex arc streamlined panoramic balconies. In this way, the construction party no longer needs to configure arc-shaped steel formworks with multiple curvature models, thereby reducing expenditure costs and construction costs. The construction party can significantly reduce costs and increase efficiency, and the practicability is good.

[0024] Specifically, in one embodiment of the invention, Figure 1-Figure 4As shown, the arc-shaped steel formwork for the cantilevered balcony of the fourth-generation residential building includes an arc-shaped formwork body 1 and a worm 3 rotatably connected to the convex side of the arc-shaped formwork body 1. The arc-shaped formwork body 1 is in the shape of an arc strip. The arc-shaped formwork body 1 is made of spring steel. The spring steel has good elasticity and is convenient for adjusting the curvature of the arc-shaped formwork body 1 without causing the arc-shaped formwork body 1 to break. Of course, in other embodiments, other metal materials with good elasticity can also be used to make the arc-shaped formwork body 1.

[0025] In this embodiment, the worm 3 is connected to the arc-shaped template body 1 for rotation. Figure 1-Figure 4 As shown, one end of the worm 3 is rotatably connected to a mounting seat 2 , and the mounting seat 2 is fixedly connected to the convex side of the arc-shaped template body 1 .

[0026] In this embodiment, the arc-shaped template body 1 has two side surfaces: an outer convex side and an inner concave side.

[0027] In this embodiment, if Figure 1-Figure 4 As shown, the worm 3 is threadedly connected with a slider 7, and the slider 7 is sleeved on the worm 3. The rotation of the worm 3 drives the slider 7 to slide axially along the worm 3. The slider 7 is hinged to one end of a traction rod 14, and the other end of the traction rod 14 is hinged to the convex side of the arc-shaped template body 1; there is at least one pair of traction rods 14, which are symmetrically distributed on both sides of the worm 3, preferably as shown in FIG. Figure 1-Figure 4 The middle part of the convex side of the arc-shaped template body 1 is rotationally connected to one end of the worm 3, and the two ends of the convex side of the arc-shaped template body 1 are hinged to the traction rod 14. In this design, the rotation of the worm 3 drives the slider 7 to slide axially along the worm 3, and the axial sliding of the slider 7 along the worm 3 drives a pair of traction rods 14 to move. The movement of the pair of traction rods 14 drives the two ends of the arc-shaped template body 1 to swing relative to the middle part of the arc-shaped template body 1, thereby changing the curvature of the arc-shaped template body 1.

[0028] Specifically, when it is necessary to reduce the curvature of the arc-shaped template body 1, the worm 3 is controlled to rotate to drive the slider 7 to slide axially along the worm 3 away from the mounting seat 2. The slider 7 slides axially along the worm 3 to drive a pair of traction rods 14 to move, thereby pulling the two ends of the arc-shaped template body 1 to swing relative to the middle part of the arc-shaped template body 1, thereby reducing the curvature of the arc-shaped template body 1.

[0029] Specifically, when the curvature of the arc-shaped template body 1 needs to be increased, the worm 3 is controlled to rotate to drive the slider 7 to slide axially along the worm 3 close to the mounting seat 2. The slider 7 slides axially along the worm 3 to drive a pair of traction rods 14 to move, while preventing the traction rods 14 from swinging away from the worm 3, so that the pair of traction rods 14 push the two ends of the arc-shaped template body 1 to swing relative to the middle part of the arc-shaped template body 1, thereby increasing the curvature of the arc-shaped template body 1.

[0030] Preferably, the worm 3 is perpendicular to the curved surface where the middle part of the convex side of the arc-shaped template body 1 is located. Such a design makes it convenient for the two ends of the arc-shaped template body 1 to synchronize their swing amplitudes relative to the middle part of the arc-shaped template body 1 during the curvature adjustment process, thereby achieving a technical effect of high adjustment quality and good adjustment effect, and the concave surface of the arc-shaped template body 1 always maintains a smooth arc shape during the curvature adjustment process.

[0031] In this embodiment, the arc-shaped steel formwork of the cantilevered balcony of the fourth-generation residential building needs to be fixedly installed on the bottom formwork during on-site pouring construction, and cooperates with the bottom formwork to define the pouring space of the cantilevered balcony. The bottom formwork is fixed horizontally, and the arc-shaped formwork body 1 is tightly attached to and vertically fixed to the upper surface of the bottom formwork to form a pouring space for the cantilevered balcony. Then, reinforcement is planted in the pouring space. After the reinforcement is planted, concrete is poured into the pouring space and compacted. The concrete contacts the inner concave surface of the arc-shaped formwork body 1 and the upper surface of the bottom formwork. After the concrete solidifies, the arc-shaped formwork body 1 and the bottom formwork are removed to form a cantilevered balcony with an arc-shaped facade. Of course, during the actual construction process, multiple arc-shaped steel formworks of the cantilevered balconies of the fourth-generation residential buildings cantilevered balconies can be selected to cooperate with each other according to the size of the cantilevered balcony to be built, and together with the bottom formwork, define the pouring space of the cantilevered balcony. For example, the arc length of the facade of the cantilevered balcony is relatively large, which exceeds the arc length of a single arc-shaped formwork body 1. At this time, multiple arc-shaped formwork bodies 1 can be spliced ​​together to form an arc-shaped formwork assembly to meet the pouring requirements of the cantilevered balcony with a large arc length. Accordingly, at this time, close attention should be paid to the connection between two adjacent arc-shaped formwork bodies 1 to prevent concrete leakage.

[0032] Further, such as Figure 4 and Figure 5 As shown, sealing strips 22 are installed at both circumferential ends of the arc-shaped formwork body 1. The sealing strips 22 are elastic, for example, made of rubber. The setting of the sealing strips 22 prevents concrete leakage at the connection between two adjacent arc-shaped formwork bodies 1. The sealing strips 22 seal the gap at the connection between two adjacent arc-shaped formwork bodies 1 tightly, ensuring that subsequent concrete pouring operations proceed smoothly.

[0033] Preferably, Figure 5As shown, a protrusion 23 is provided on the side of the sealing strip 22 facing away from the arc-shaped formwork body 1, and a cavity 24 is provided in the sealing strip 22. The setting of the protrusion 23 is conducive to enhancing the sealing degree of the connection between two adjacent arc-shaped formwork bodies 1. The setting of the cavity 24 can increase the expansion and contraction deformation of the sealing strip 22, further enhance the sealing degree of the connection between two adjacent arc-shaped formwork bodies 1, and ensure that no concrete leakage occurs at the connection between two adjacent arc-shaped formwork bodies 1.

[0034] In this embodiment, the arc-shaped template body 1 can be detachably fixed to the bottom template by fasteners such as bolts, or by electromagnets 6. Preferably, electromagnets 6 are used to detachably fix the arc-shaped template body 1 to the bottom template. This design makes the disassembly and installation of the arc-shaped template body 1 relatively simple and convenient. Specifically, Figure 1-Figure 4 As shown, the lower end of the mounting seat 2 is fixedly connected with an electromagnet 6 through a connecting column 5, and the lower surface of the electromagnet 6 is flush with the lower surface of the arc-shaped template body 1. In this way, when the lower surface of the arc-shaped template body 1 is in close contact with the upper surface of the bottom template and the arc-shaped template body 1 is perpendicular to the upper surface of the bottom template, the lower surface of the electromagnet 6 is also in close contact with the upper surface of the bottom template, and then the electromagnet 6 is energized to be fixedly connected with the bottom template by attraction, so that the arc-shaped steel template of the cantilevered balcony of the fourth-generation residential building in this embodiment can be quickly and firmly fixed on the upper surface of the bottom template. Accordingly, the bottom template needs to be made of a material that can be attracted by a magnet, and it is preferred to use a low-cost ordinary steel plate to make the bottom template.

[0035] In this embodiment, if Figure 1-Figure 4 As shown, a slip ring 18 is slidably mounted on the worm 3 along the axial direction of the worm 3 , and a distance measuring device 19 is provided on the mounting seat 2 , and the distance measuring device 19 is used to measure the distance from itself to the slip ring 18 . A laser 16 is fixedly installed in the area of ​​the other end of the convex side of the arc-shaped template body 1 near the traction rod 14. The laser line 17 emitted by the laser 16 can be projected on the slip ring 18. When the curvature of the arc-shaped template body 1 changes, the intersection of the laser lines 17 emitted by the two lasers 16 also moves axially on the worm 3. In order to keep the laser line 17 emitted by the laser 16 always projected on the slip ring 18, it is necessary to move the slip ring 18 along the worm 3. Correspondingly, the distance from the distance measuring device 19 to the slip ring 18 changes accordingly. Different curvatures correspond to different distances. The curvature corresponding to each distance value can be measured in advance, and then the curvature of the arc-shaped template body 1 at this moment is obtained according to the real-time distance value measured by the distance measuring device 19. This design is convenient for construction site workers to quickly adjust the curvature of the arc-shaped template body 1 according to construction needs, without directly measuring the curvature of the arc-shaped template body 1, because it is difficult to directly measure the curvature.

[0036] Preferably, to facilitate the installation of the laser 16, as Figure 1-Figure 4 As shown, the other end of the traction rod 14 is hinged to the rod seat 15, and the rod seat 15 is fixedly connected to the convex side of the arc-shaped template body 1. The laser 16 is fixedly installed on the rod seat 15, and the laser lines 17 emitted by a pair of lasers 16 intersect on the upper surface or the lower surface of the worm 3.

[0037] Furthermore, in this embodiment, a worm wheel 10 connected to the worm 3 is rotatably mounted on the slider 7. Specifically, Figure 3 As shown, the slider 17 is provided with a mounting hole 11, the worm wheel 10 is located in the mounting hole 11, screws coaxial with the worm wheel 10 are fixedly installed on both sides of the worm wheel 10, and the two screws are respectively recorded as screw 1 8 and screw 2 9, and the screw 1 8 and screw 2 9 are both connected with the slider 1 7 for rotation, and the rotation of the worm 3 drives the worm wheel 10 to rotate, and the rotation of the worm wheel 10 drives the screw 1 8 and screw 2 9 to rotate, and the screw 1 8 and screw 2 9 are both threadedly connected with a slider 2 12, and the rotation of the screw 1 8 and screw 2 9 drives the slider 2 12 to slide along the axial direction of the screw. Specifically, the rotation of the worm wheel 10 drives a pair of sliders 2 12 on the screw 1 8 and screw 2 9 to approach or move away from each other. More specifically, When the worm 3 rotates to drive the slider 17 to move away from the mounting seat 2, the pair of sliders 12 on the screw 18 and the screw 29 move away from each other. When the worm 3 rotates to drive the slider 17 to move close to the mounting seat 2, the pair of sliders 12 on the screw 18 and the screw 29 move close to each other. With this design, during the operation of reducing the curvature of the arc-shaped template body 1, the pair of sliders 12 move away from each other without touching the pair of traction rods 14 and do not affect the movement of the pair of traction rods 14. During the operation of increasing the curvature of the arc-shaped template body 1, the pair of sliders 12 move close to each other and push the pair of traction rods 14 to swing close to the worm 3, preventing the traction rods 14 from swinging away from the worm 3, thereby ensuring that the curvature adjustment operation is carried out smoothly.

[0038] In this embodiment, the rotation of the screw rod 1 8 and the screw rod 2 9 drives the slider 2 12 to move and contact or separate from the traction rod 14 . Specifically, a pair of sliders 12 approach each other and contact the traction rod 14 , and a pair of sliders 12 move away from each other and separate from the traction rod 14 .

[0039] In this embodiment, after the screw rotates and drives a pair of sliders 12 to approach each other and contact a pair of traction rods 14, the pair of sliders 12 continue to approach each other, squeeze the traction rods 14 and slide close to the traction rods 14, pushing the traction rods 14 to rotate around the slider 1 7 and approach the worm 3.

[0040] In this embodiment, further, Figure 1-Figure 4As shown, a slot 13 is provided on the slider 12, and the traction rod 14 slides through the slot 13. The design of the slot 13 enhances the sliding connection stability between the slider 12 and the traction rod 14, and prevents the slider 12 from being separated from the traction rod 14 when the slider 12 slides against the traction rod 14. In addition, the design of the slot 13 can also enable the traction rod 14 to block the rotation of the screw and drive the slider 12 to rotate, so that the slider 12 can only move along the axial direction of the screw.

[0041] Further, such as Figure 6 and Figure 7 As shown, a ball 21 is self-rollingly installed in the slot 13, and a slide groove 20 extending along the length direction of the traction rod 14 is provided on the traction rod 14. The ball 21 extends into the slide groove 20, and the traction rod 14 moves in the slot 13 to drive the ball 21 to roll in the slide groove 20. With this design, the traction rod 14 and the slider 12 can be connected in a rolling manner through the ball 21 and the slide groove 20 to replace the aforementioned sliding connection, thereby reducing the wear of the traction rod 14 and the slot 13 and extending the service life of the traction rod 14 and the slider 12.

[0042] In this embodiment, if Figure 1 As shown, a socket 4 is provided at the other end of the worm 3 , and the socket 4 is designed to facilitate the plug-in transmission connection between the electric tool that drives the worm 3 to rotate and the worm 3 .

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The fourth generation of arc steel formwork for cantilevered balconies in residential buildings is characterized by: It includes an arc-shaped template body and a worm screwedly connected to the convex side of the arc-shaped template body, the worm screw thread is screwed with a slider 1, the slider 1 is hinged to one end of a traction rod, and the other end of the traction rod is hinged to the convex side of the arc-shaped template body; There is at least one pair of traction rods, which are symmetrically distributed on both sides of the worm.

2. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 1, characterized in that: The middle part of the outer convex side of the circular arc-shaped template body is rotatably connected to one end of the worm, and the two ends of the outer convex side of the circular arc-shaped template body are hinged to the traction rod.

3. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 2, characterized in that: The worm is perpendicular to the curved surface where the middle part of the outer convex side of the arc-shaped template body is located.

4. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 1, characterized in that: One end of the worm is rotatably connected to a mounting seat, and the mounting seat is fixedly connected to the outer convex side of the arc-shaped template body; The lower end of the mounting seat is fixedly connected with an electromagnet, and the lower surface of the electromagnet is flush with the lower surface of the arc-shaped template body.

5. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 4, characterized in that: A slip ring is slidably mounted on the worm along the axial direction of the worm, and a distance measuring device is arranged on the mounting seat, and the distance measuring device is used to measure the distance from the worm to the slip ring; A laser is fixedly installed in an area near the other end of the traction rod on the outer convex side of the arc-shaped template body, and the laser line emitted by the laser can be projected onto the slip ring.

6. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 1, characterized in that: A worm wheel connected to the worm gear is rotatably installed on the slider one, and screw rods coaxial with the worm wheel are fixedly installed on both sides of the worm wheel. The screw rods are threadedly connected with the slider two. The rotation of the worm wheel drives a pair of sliders two to approach or move away from each other, contact or separate from the traction rod. The rotation of the worm wheel drives a pair of sliders two to approach each other, contact the traction rod and continuously squeeze the traction rod and slide close to the traction rod, thereby pushing the traction rod to rotate around the slider one.

7. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 6, characterized in that: The sliding block 2 is provided with a slot, and the traction rod slides through the slot.

8. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 7, characterized in that: A ball is self-rollingly installed in the slot, a slide groove extending along the length direction of the traction rod is arranged on the traction rod, the ball extends into the slide groove, and the traction rod moves in the slot to drive the ball to roll in the slide groove.

9. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 1, characterized in that: Sealing strips are installed at both circumferential ends of the arc-shaped template body.

10. The fourth generation residential building cantilever balcony arc steel formwork as claimed in claim 9, characterized in that: A protrusion is arranged on the side of the sealing strip away from the arc-shaped template body, and a cavity is arranged inside the sealing strip.

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