Unilateral formwork supporting system and construction method of unilateral formwork supporting system

Abstract

The invention provides a single-side formwork supporting system and a construction method of the single-side formwork supporting system, and relates to building construction. Wherein the single-side formwork supporting system comprises a first formwork, a second formwork, wood braces, double-row steel bar back ridges, double-row steel pipes and fasteners, and the first formwork and a wall of an existing building are arranged at a first interval; the second template and the first template are arranged at an interval of a second distance and define a pouring cavity; the wood brace is arranged on the side, away from the first formwork, of the second formwork; the multiple sets of double-row steel bar back ridges are arranged on the first formwork at intervals in the vertical direction and located on the side, away from the second formwork, of the first formwork. The multiple groups of double-row steel pipes are arranged on the square wood at intervals in the vertical direction and located on the side, away from the second formwork, of the square wood, and one group of double-row steel pipes and one group of double-row steel bar back ridges are arranged in the horizontal direction; and a fastener penetrates through and is fastened on the group of double-row steel pipes and the group of double-row steel bar back ridges which are positioned on the same level with the double-row steel pipes. Cavities between the new wall and the old wall are reduced, and the occupied indoor area is saved.

Description

Technical Field

[0001] This application relates to the field of building construction, and more specifically, to a single-sided formwork system and a construction method for the single-sided formwork system. Background Technology

[0002] With the acceleration of urbanization and the increasing demand for urban renewal, building renovation projects play a vital role in urban development. In the process of renovating old buildings, it is often necessary to reinforce or rebuild the original structure to meet the safety and usability requirements of modern buildings. Among these challenges, the renovation of exposed exterior brick walls is a common technical hurdle.

[0003] In existing technologies, the reinforcement or reconstruction of exposed brick walls on the outside of buildings typically involves constructing a new shear wall on the inside of the existing wall. The main steps of this method include: first, conducting a structural assessment of the existing brick wall to determine its load-bearing capacity and stability; then, constructing a new reinforced concrete shear wall on the inside of the existing wall according to design requirements, connecting it to the original structure using methods such as rebar installation or chemical anchors; and finally, completing the pouring and curing of the shear wall. This construction method eliminates the need for scaffolding on the outside of the building, avoiding the safety risks of working at heights and reducing the impact on the surrounding environment.

[0004] However, constructing new shear walls on the inside significantly reduces interior space, especially in buildings with limited space. This construction method directly reduces the usable area, impacting the functionality and economic benefits of the renovated space. For commercial buildings or residential renovation projects, the reduction in usable interior space directly affects the project's economic value and user experience. Summary of the Invention

[0005] The purpose of this application is to provide a single-sided formwork system and a construction method for the single-sided formwork system, which can reduce the proportion of indoor usable area occupied by newly built shear walls, thereby improving economic value and user experience.

[0006] In a first aspect, the present invention provides a single-sided formwork system for supporting existing buildings, comprising: The first template is set at a first distance from the wall of the existing building, and the two ends of the first template are respectively connected to the bottom plate and the top plate of the existing building; The second template is set at a second distance from the first template and defines the casting cavity, and the two ends of the second template are respectively connected to the bottom plate and the top plate; Timber beams are placed on the side of the second template opposite to the first template; Double-row steel reinforcement back ribs, multiple sets of the double-row steel reinforcement back ribs are arranged vertically at intervals on the first template and located on the side of the first template away from the second template; Double-row steel pipes, multiple sets of the double-row steel pipes are vertically spaced on the timber and located on the side of the timber away from the second template; one set of the double-row steel pipes and one set of the double-row reinforcing bars are horizontally arranged; and A fastener, one of which is inserted into and secured to a set of the double-row steel pipes and a set of the double-row steel reinforcement back braces at the same level as the double-row steel pipes.

[0007] In an optional embodiment, the fastener includes a tie rod, a U-shaped fastener, and a nut. The tie rod passes through the wooden beam, the second template, and the first template, and has a locked state and an unlocked state. In the locked state, one end of the tie rod abuts against the side of the double-row steel reinforcement back rib facing away from the first template, the U-shaped fastener is located at the other end of the tie rod and abuts against the side of the double-row steel pipe facing away from the second template, and the nut is screwed to the tie rod and locked onto the U-shaped fastener.

[0008] In an optional embodiment, the tie rod includes a rod portion and a connecting portion. The rod portion passes through the wooden beam, the second template, and the first template. The connecting portion is perpendicularly connected to the rod portion. The first template is provided with a mounting hole. The longest length of the connecting portion is less than the maximum diameter of the mounting hole, and the longest length of the connecting portion is greater than the minimum diameter of the mounting hole.

[0009] In an optional embodiment, the single-sided formwork system further includes a first reinforcing mesh, a second reinforcing mesh, and protective blocks. The first reinforcing mesh and the second reinforcing mesh are disposed in the casting cavity, and a set of protective blocks are fixed to the first reinforcing mesh and the first formwork, and a set of protective blocks are fixed to the second reinforcing mesh and the second formwork.

[0010] In an optional implementation, the first distance is 3 to 5 cm.

[0011] Secondly, the present invention provides a construction method for a single-sided formwork system as described in the foregoing embodiments, the construction method for the single-sided formwork system comprising: The floor of the existing building to be supported by formwork is defined as the first floor, and the floor above the floor to be supported by formwork is defined as the second floor. The pouring opening is formed by chiseling through the bottom plate of the second floor downwards. Multiple sets of double-row steel reinforcement back braces are pre-installed on the same side of the first formwork; The first template is constructed at a first distance from the wall of the existing building to the top slab of the first floor, with the side of the first template having the double-row steel back ribs facing the wall; The second template is constructed at a second distance from the first template to the top slab of the first layer, and the second template and the first template define a pouring cavity, which is connected to the pouring port; Construct the timber beams to the side of the second formwork that is away from the first formwork; Multiple sets of double-row steel pipes are installed on the side of the timber beam away from the second template; Install fasteners and complete the formwork support; Concrete is poured from the pouring port into the pouring cavity, and after the concrete sets, a shear wall is formed.

[0012] In an optional implementation, before constructing the first template, fixed points are marked on the first template, and then mounting holes are opened at the fixed points. The double-row steel back bracing is fixed in conjunction with the marked positions of the fixed points.

[0013] In an optional implementation, after the first template is constructed, the fastener is rotated until the connecting part of the fastener can pass through the mounting hole. Then, after the connecting part passes through the mounting hole, the fastener is rotated again and the mounting hole is sealed.

[0014] In an optional implementation, before constructing the second template, a connecting hole is first opened on the second template, and then the connecting hole is aligned with the rod of the fastener to construct the second template; before constructing the timber, a through hole is first opened on the timber, and then the through hole is aligned with the rod to construct the timber, and finally the mountain-shaped fastener and nut of the fastener are installed. After tightening the nut, the mountain-shaped fastener abuts against the double-row steel pipe, and the connecting part abuts against the back rib of the double-row steel bar.

[0015] In an optional embodiment, after constructing the first template and before constructing the second template, a first steel mesh and a second steel mesh are constructed in the pouring cavity, and a protective layer block is used to fix the first steel mesh and the second steel mesh.

[0016] Compared to existing technologies, the beneficial effects of this application are: This application uses the first and second templates as the two sides of the pouring cavity, reinforced with wooden beams, and then fixed with fasteners to the double-row steel reinforcement back ribs and double-row steel pipes to achieve formwork support. This can reduce the proportion of indoor usable area occupied by the newly built shear wall, and improve economic value and user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The diagrams show construction schematics of a single-sided formwork system and an existing building in some embodiments; Figure 2 It shows Figure 1 Enlarged view of section A in the middle; Figure 3 The diagrams showing the connection between fasteners and reinforcing bar back ribs and steel pipes in some embodiments are illustrated. Figure 4 The diagram shows the connection between the fasteners and the reinforcing bar back ribs and the first formwork in some embodiments; Figure 5 A flowchart of the construction method for a single-sided formwork system is shown in some embodiments.

[0019] Explanation of key component symbols: 10-Single-sided formwork system; 100-First formwork; 110-Mounting hole; 200-Second formwork; 300-Timber; 400-Reinforcing bar back brace; 500-Steel pipe; 600-Fastener; 610-Tie rod; 611-Bar section; 612-Connector; 620-U-shaped fastener; 630-Nut; 700-Reinforcing bar; 800-Fixing strip; 900-Transverse connecting reinforcement; 20-Wall; 30-Base slab; 40-Top slab; a-Pouring port; b-Pouring cavity; L1-First layer; L2-Second layer. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Please see Figures 1 to 3 This embodiment is applicable to formwork support for existing buildings. The exposed outer brick wall of the existing building is preserved and scaffolding cannot be erected on the outside. For ease of description and understanding, the exposed outer brick wall is defined as wall 20, the side located inside the existing building is defined as the inner side of wall 20, and the side located on the exposed outer side is defined as the outer side of wall 20.

[0026] This embodiment provides a single-sided formwork system 10, which supports the formwork inside the wall 20. The single-sided formwork system 10 includes a first template 100, a second template 200, a timber 300, a double-row steel reinforcement back rib 400, a double-row steel pipe 500, and fasteners 600.

[0027] The first template 100 is set at a first distance from the wall 20 of the existing building, and the two ends of the first template 100 are respectively connected to the bottom plate 30 and the top plate 40 of the existing building; here, the first distance is 3~5cm.

[0028] The second template 200 is set at a second distance from the first template 100 to define the pouring cavity b, and the two ends of the second template 200 are respectively connected to the bottom plate 30 and the top plate 40; after concrete is poured into the pouring cavity b, a concrete layer is formed.

[0029] It is worth noting that, in order to define the casting cavity b, in addition to the first template 100 and the second template 200, the following three methods can be used for closure: The first method is to construct side templates between the first template 100 and the second template to form a rectangular casting cavity b. Similarly, there are two side templates, both of which are connected to the bottom plate 30 and the top plate 40. The second method is to connect both sides of the first template 100 to other walls, using the other walls as the closure ends. The third method is to also use the single-sided formwork system 10 provided in this embodiment on other walls, and the casting cavity b of the single-sided formwork system on other walls is connected to the casting cavity b of the wall 20 to form a closed casting cavity b.

[0030] Timber 300 is placed on the side of the second template 200 away from the first template 100.

[0031] Multiple sets of double-row steel reinforcement back ribs 400 are vertically spaced on the first template 100 and located on the side of the first template 100 away from the second template 200. Each set of double-row steel reinforcement back ribs 400 includes two steel reinforcement back ribs 400. The distance between the two steel reinforcement back ribs 400 is greater than the short side of the connecting part 612 (described later), and the distance between the two steel reinforcement back ribs 400 is shorter than the long side of the connecting part 612.

[0032] Multiple sets of double-row steel pipes 500 are vertically spaced on the timber 300 and located on the side of the timber 300 away from the second formwork 200. One set of double-row steel pipes 500 and one set of double-row reinforcing bar back ribs 400 are horizontally arranged. Each set of double-row steel pipes 500 includes two steel pipes 500, and the distance between the two steel pipes 500 is greater than the diameter of the rod 611 mentioned later.

[0033] A fastener 600 is inserted into and fastened to a set of double-row steel pipes 500 and a set of double-row reinforcing bar back ribs 400 located at the same level as the double-row steel pipes 500.

[0034] The fasteners 600 are also divided into multiple groups, with each group of fasteners 600 spaced apart along the length of the back rib of the reinforcing bar 400.

[0035] Please see Figures 2 to 4 In some embodiments, the fastener 600 includes a tie rod 610, a U-shaped fastener 620, and a nut 630. The tie rod 610 passes through the wooden beam 300, the second template 200, and the first template 100, and has a locked state and an unlocked state.

[0036] In the locked state, one end of the tie rod 610 abuts against the side of the double-row steel back rib 400 away from the first template 100, the mountain-shaped fastener 620 is located at the other end of the tie rod 610 and abuts against the side of the double-row steel pipe 500 away from the second template 200, and the nut 630 is screwed to the tie rod 610 and locked onto the mountain-shaped fastener 620.

[0037] The tie rod 610 includes a rod portion 611 and a connecting portion 612. The rod portion 611 passes through the timber 300, the second template 200 and the first template 100. The connecting portion 612 is perpendicularly connected to the rod portion 611. The first template 100 is provided with a mounting hole 110. The longest length of the connecting portion 612 is less than the maximum diameter of the mounting hole 110, and the longest length of the connecting portion 612 is greater than the minimum diameter of the mounting hole 110.

[0038] In this embodiment, the rod 611 can be set as a round rod with a diameter of 10mm and external thread, the connecting part 612 is set as a cuboid, the mounting hole 110 is an elongated hole, and the connecting part 612 is interference-fitted with the mounting hole 110. This design allows the connecting part 612 to easily pass through the mounting hole 110.

[0039] The interference fit is implemented as follows: each side of the mounting hole 110 is 5mm larger than the corresponding side of the connecting part 612. For example, if the long side of the connecting part 612 is 5cm, then the long side of the mounting hole 110 is 5.5cm.

[0040] During installation, first align the long side of the connecting part 612 with the long side of the mounting hole 110, so that the connecting part 612 passes through the mounting hole 110 from the first side of the first template 100 to the second side of the first template 100 (the side with the double-row steel back rib 400). Then, hold the rod part 611 on the first side of the first template 100 and rotate the rod part 611 so that the long side of the connecting part 612 is set at an angle with the long side of the mounting hole 110, thereby achieving a locked state and preventing the connecting part 612 from retracting from the mounting hole 110 when tightening later.

[0041] To ensure a stable connection between the connecting part 612 and the double-row steel bar back rib 400, in this embodiment, the rotation angle of the rod part 611 can be set to 90 degrees, that is, the included angle is 90°, and the long side of the connecting part 612 is perpendicular to the long side of the mounting hole 110.

[0042] It is worth noting that in this embodiment, the double-row steel bar back rib 400 and the connecting part 612 are only set within the first distance, that is, the first distance only needs to satisfy the sum of the dimensions of the double-row steel bar back rib 400 and the connecting part 612, which can maximize the shortening of the first distance and reduce the occupation of indoor space.

[0043] In some embodiments, the single-sided formwork system 10 further includes a first reinforcing mesh (not shown in the figure), a second reinforcing mesh (not shown in the figure), and protective layer blocks (not shown in the figure). The first reinforcing mesh and the second reinforcing mesh are disposed in the casting cavity b. A set of protective layer blocks are fixed to the first reinforcing mesh and the first formwork 100, and a set of protective layer blocks are fixed to the second reinforcing mesh and the second formwork 200.

[0044] In some embodiments, both the first and second steel meshes include vertical steel bars 700, and multiple vertical steel bars 700 are pre-embedded in the pouring cavity b, thereby improving the concrete layer.

[0045] Please see Figure 1 and Figure 2 The length of the vertical reinforcement 700 is longer than the pouring height of the shear wall. That is, the vertical reinforcement 700 passes through the pouring opening a and extends to the second floor L2. In this way, when the second floor L2 is the floor to be supported by formwork, the vertical reinforcement 700 of the upper and lower floors can be tied together to transfer the longitudinal load.

[0046] In some embodiments, both the first and second steel meshes include transverse steel bars, which are arranged in a crisscross pattern with the vertical steel bars to form a mesh structure.

[0047] In some embodiments, the single-sided formwork system 10 further includes a fixing strip 800 disposed on the side of the first formwork 100 facing the wall 20. This ensures that the lateral pressure of the concrete will not crush the first formwork 100 during the pouring process, thereby improving the safety factor of the wall 20.

[0048] The single-sided formwork system 10 provided in this embodiment is completely separated from the existing building wall 20, avoiding the impact on the wall 20 during the renovation and reinforcement process. It provides extremely high protection for the wall 20, avoiding the safety risks after damage to the wall 20 and the problem of not being able to finish the work after the wall 20 is damaged.

[0049] In related technologies, due to the influence of the retained wall 20, and considering that there is sufficient operating surface between the new and old walls, the total thickness of the new and old walls and the cavity needs to reach 1m, of which the cavity occupies 56cm as operating space. However, the first distance of this application is only 5cm, and the difference in cavity occupancy is extremely large, which can greatly increase the utilization rate of indoor space.

[0050] Based on the above content and references Figure 5 The existing building includes multiple floors to be supported by formwork. Taking one floor as an example, this embodiment further explains the working principle of the single-sided formwork system 10 as follows: Please see Figure 1 , Figure 2 .

[0051] S100. Define the existing building floor to be supported by formwork as the first floor L1, and the floor above the floor to be supported by formwork as the second floor L2. Drill through the bottom plate 30 of the second floor L2 downwards to form a pouring opening a.

[0052] In this embodiment, multiple pouring ports a can be constructed. The multiple pouring ports a are arranged at intervals along the length of the preset shear wall. Each pouring port a is arranged in a trapezoidal shape. The long side of the pouring port a is located in the second layer L2, and the short side of the pouring port a is located in the first layer L1. This can achieve concentrated pouring of concrete and reduce splashing.

[0053] Specifically, the distance between adjacent pouring openings a is 1m, the long side of pouring opening a is 220mm, and the short side is 200mm.

[0054] After pouring at the pouring point a, a fixing strip 800 is installed on the side of pouring at the pouring point a near the wall 20. The fixing strip 800 is set along the length of the shear wall. The fixing strip 800 is 40mm×40mm in size. Taking a first distance of 5cm as an example, the distance between the left side of the fixing strip 800 and the wall 20 is 5cm, the distance between the right side of the fixing strip 800 and the wall 20 is 1cm, and the fixing strip 800 is 10mm from the outer wall side.

[0055] S200. Pre-install multiple sets of double-row steel bar back ribs 400 onto the same side of the first formwork 100.

[0056] Before constructing the first formwork 100, mark the fixed points on the first formwork 100, then open the mounting holes 110 at the fixed points, and fix the double-row steel back bracing 400 according to the marked position of the fixed points.

[0057] Specifically, the diameter of the 400mm diameter back brace is 16mm, and a set of transverse connecting bars 900mm is set every 1m.

[0058] S300. The first template 100 is constructed at a distance from the existing building wall 20 to the top slab 40 of the first floor L1, and the side of the first template 100 with double-row steel back ribs 400 faces the wall 20.

[0059] By attaching the first template 100 to the fixing strip 800 during construction, the requirement for the first interval can be met.

[0060] Please see Figures 2 to 4 After the first template 100 is completed, the fastener 600 is rotated until the connecting part 612 of the fastener 600 can pass through the mounting hole 110. After the connecting part 612 passes through the mounting hole 110, the fastener 600 is rotated again and the mounting hole 110 is sealed with galvanized iron sheet.

[0061] Specifically, the first template 100 is made up of multiple sub-templates installed layer by layer according to the template module until it reaches the top, and the thickness of the sub-templates is 10mm.

[0062] S400. The second template 200 and the first template 100 are constructed at a second distance to the top slab 40 of the first layer L1. The second template 200 and the first template 100 define the pouring cavity b, which is connected to the pouring port a.

[0063] Specifically, the second template 200 is constructed by installing multiple sub-templates layer by layer according to the template module until it reaches the top, and the thickness of each sub-template is 10mm.

[0064] Before constructing the second template 200, first open a connecting hole on the second template 200, then align the connecting hole with the rod 611 of the fastener 600 and construct the second template 200; before constructing the timber 300, first open a through hole on the timber 300, then align the through hole with the rod 611 and construct the timber 300, finally install the mountain-shaped fastener 620 and nut 630 of the fastener 600, after tightening the nut 630, the mountain-shaped fastener 620 abuts against the double-row steel pipe 500, and the connecting part 612 abuts against the double-row steel back rib 400.

[0065] After constructing the first formwork 100 and before constructing the second formwork 200, construct the first and second steel reinforcement meshes in the pouring cavity b, and use protective blocks to fix the first and second steel reinforcement meshes.

[0066] It is worth noting that in this embodiment, a length is reserved at the upper end of the vertical bars 700 of the first and second steel meshes as the lap length when supporting the formwork of the upper layer. The vertical bars 700 can be connected between the upper and lower layers through the pouring port a to realize the longitudinal transfer of load.

[0067] S500. Construct the timber 300 to the side of the second formwork 200 that is away from the first formwork 100.

[0068] Specifically, the dimensions of the 300mm timber are 40mm × 90mm.

[0069] S600. Install multiple sets of double-row steel pipes 500 onto the side of the timber 300 away from the second template 200.

[0070] Specifically, the diameter of steel pipe 500 is 48.3 mm.

[0071] S700. Install fastener 600 to complete the formwork support.

[0072] S800. Concrete is poured from pouring port a into pouring cavity b. After the concrete sets, a shear wall is formed.

[0073] During pouring, ensure proper vibration to guarantee the density of the concrete.

[0074] After the concrete has set and met the conditions for demolding, first unscrew the nut 630 and remove the mountain-shaped fastener 620, then remove the timber 300 and the second formwork 200, and finally cut off the exposed rod portion 611 in the concrete layer. The concrete must be cured for at least 7 days.

[0075] Since the initial distance is 3-5cm, the gap between the shear wall and the wall 20 is only 3-5cm, which reduces the occupied indoor usable area and has a good construction effect.

[0076] Repeat the above steps to carry out formwork construction on the existing building layer by layer to complete the reinforcement work of the old building.

[0077] In this embodiment, the first template 100 and the second template 200 are used as the two sides of the pouring cavity b. They are reinforced with wooden beams 300 and then fixed with fasteners 600, double-row steel back ribs 400, and double-row steel pipes 500 to achieve formwork support. This can reduce the proportion of indoor usable area occupied by the newly built shear wall, and improve economic value and user experience.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-sided formwork support system for existing building formwork support, characterized in that, include: The first template is set at a first distance from the wall of the existing building, and the two ends of the first template are respectively connected to the bottom plate and the top plate of the existing building; The second template is set at a second distance from the first template and defines the casting cavity, and the two ends of the second template are respectively connected to the bottom plate and the top plate; Timber beams are placed on the side of the second template opposite to the first template; Double-row steel reinforcement back ribs, multiple sets of the double-row steel reinforcement back ribs are arranged vertically at intervals on the first template and located on the side of the first template away from the second template; Double-row steel pipes, multiple sets of the double-row steel pipes are arranged vertically at intervals on the timber and located on the side of the timber away from the second template, and one set of the double-row steel pipes and one set of the double-row steel back ribs are arranged horizontally; and A fastener, one of which is inserted into and secured to a set of the double-row steel pipes and a set of the double-row steel reinforcement back braces at the same level as the double-row steel pipes.

2. The single-sided formwork system as described in claim 1, characterized in that, The fasteners include tie rods, U-shaped fasteners, and nuts. The tie rods pass through the wooden beams, the second template, and the first template, and have locked and unlocked states. In the locked state, one end of the tie rod abuts against the side of the double-row steel reinforcement back rib facing away from the first template. The U-shaped fastener is located at the other end of the tie rod and abuts against the side of the double-row steel pipe facing away from the second template. The nut is screwed to the tie rod and locked onto the U-shaped fastener.

3. The single-sided formwork system as described in claim 2, characterized in that, The tie rod includes a rod portion and a connecting portion. The rod portion passes through the wooden beam, the second template, and the first template. The connecting portion is perpendicularly connected to the rod portion. The first template has a mounting hole. The longest length of the connecting portion is less than the maximum diameter of the mounting hole, and the longest length of the connecting portion is greater than the minimum diameter of the mounting hole.

4. The single-sided formwork system as described in any one of claims 1 to 3, characterized in that, It also includes a first reinforcing mesh, a second reinforcing mesh, and protective layer blocks. The first reinforcing mesh and the second reinforcing mesh are disposed in the casting cavity. A set of the protective layer blocks is fixed to the first reinforcing mesh and the first template, and a set of the protective layer blocks is fixed to the second reinforcing mesh and the second template.

5. The single-sided formwork system as described in any one of claims 1 to 3, characterized in that, The first distance is 3~5cm.

6. A construction method for a single-sided formwork system as described in any one of claims 1 to 5, characterized in that, include: The floor of the existing building to be supported by formwork is defined as the first floor, and the floor above the floor to be supported by formwork is defined as the second floor. The pouring opening is formed by chiseling through the bottom plate of the second floor downwards. Multiple sets of double-row steel reinforcement back braces are pre-installed on the same side of the first formwork; The first template is constructed at a first distance from the wall of the existing building to the top slab of the first floor, with the side of the first template having the double-row steel back ribs facing the wall; The second template is constructed at a second distance from the first template to the top slab of the first layer, and the second template and the first template define a pouring cavity, which is connected to the pouring port; Construct the timber beams to the side of the second formwork that is away from the first formwork; Multiple sets of double-row steel pipes are installed on the side of the timber beam away from the second template; Install fasteners and complete the formwork support; Concrete is poured from the pouring port into the pouring cavity, and after the concrete sets, a shear wall is formed.

7. The construction method of the single-sided formwork system as described in claim 6, characterized in that, Before constructing the first template, fixation points are marked on the first template, and then installation holes are opened at the fixation points. The double-row steel back bracing is fixed in conjunction with the marked positions of the fixation points.

8. The construction method of the single-sided formwork system as described in claim 7, characterized in that, After the first template is completed, the fastener is rotated until the connecting part of the fastener can pass through the mounting hole. Then, after the connecting part passes through the mounting hole, the fastener is rotated again and the mounting hole is sealed.

9. The construction method of the single-sided formwork system as described in claim 8, characterized in that, Before constructing the second template, first open a connecting hole on the second template, then align the connecting hole with the rod of the fastener and construct the second template; before constructing the timber, first open a through hole on the timber, then align the through hole with the rod and construct the timber, and finally install the mountain-shaped fastener and nut of the fastener. After tightening the nut, the mountain-shaped fastener abuts against the double-row steel pipe, and the connecting part abuts against the back rib of the double-row steel bar.

10. The construction method of the single-sided formwork system as described in claim 9, characterized in that, After constructing the first template and before constructing the second template, a first steel mesh and a second steel mesh are constructed in the pouring cavity, and the first steel mesh and the second steel mesh are fixed using protective blocks.

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