Temporary fixing device for cantilever gable and construction method

Abstract

The present application relates to the technical field of building structure reinforcing device, and particularly relates to a cantilevered gable temporary fixing device and a construction method, which comprises a middle connecting rod arranged horizontally between two cantilevered gable structures, and end head fixers arranged at the two ends of the middle connecting rod; the end head fixers are used for pulling and restraining the two cantilevered gable structures at the same elevation position; the end head fixer comprises a screw rod with two screw nuts, and two steel plates slidingly inserted into the screw rod and coaxially connected to the screw nuts near the wall body; the present application can accurately control the perpendicularity of the wall body by the layer-by-layer supporting construction method, realizes the layer-by-layer reinforcing and layer-by-layer supporting from bottom to top, has strong universality, is convenient to disassemble and assemble, and can be recycled and reused, significantly improves the construction continuity and economy, and effectively solves the collapse risk of the high cantilevered gable in the reinforcing process.

Description

Technical Field

[0001] This invention relates to the field of building structure reinforcement devices, specifically to a temporary fixing device for cantilever gable walls and its construction method. Background Technology

[0002] In urban renewal and historical and cultural block protection projects, a large number of old brick and wood structures are classified as dangerous buildings due to their age, decay and insect infestation of wooden components, and failure of joints, and structural renovation is required. Due to the restrictions of style protection requirements, such buildings need to retain the historical components such as the gable walls on both sides, and only the interior wooden structure is removed and replaced with a reinforced concrete internal frame structure.

[0003] After the removal of the internal wooden load-bearing structure, the gable walls on both sides lose their lateral support and are in a cantilevered state, reaching a height of several meters. When one or both sides of the wall are exposed to the air, its own stability is extremely poor. Under the influence of construction disturbance, wind load, and uneven foundation settlement, it is prone to tilting, cracking, outward tilting, or even collapse, posing significant safety risks. Existing temporary fixation of cantilever gable walls mostly uses traditional measures such as steel pipe bracing, guy ropes, and steel jacks, which have obvious shortcomings: traditional supports occupy indoor space and interfere with the construction process of the internal frame; fixing requires drilling holes, penetrating walls, or anchoring, causing irreversible damage to the historical brick walls and failing to meet cultural relic protection requirements; the adjustment capacity of the devices is weak, making it difficult to accurately control the verticality of the wall; it is impossible to achieve layer-by-layer reinforcement and layer-by-layer support replacement, resulting in poor construction continuity; the components have low versatility, are cumbersome to disassemble and assemble, are not reusable, and are not economical.

[0004] Currently, there is no dedicated temporary fixing device and matching construction method for high cantilevered, open gable walls in the replacement and renovation of brick-wood internal frames, making it difficult to balance safety, protection, and construction efficiency. Therefore, there is a need for a flexible, adaptable, and reusable temporary fixing combination device for cantilevered gable walls. In view of this, we propose a temporary fixing device and construction method for cantilevered gable walls. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings mentioned in the background section and to provide a temporary fixing device and construction method for cantilever gable walls.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A temporary fixing device for a cantilever gable includes a central connecting rod horizontally arranged between two cantilever gable structures, and end fixing devices installed at both ends of the central connecting rod. The end retainer is used to tension and constrain the cantilever gable structure on both sides and is located at the same elevation. The end retainer includes a screw rod with two tightening nuts threaded on it, and two steel plates that are slidably inserted into the screw rod and coaxially connected to the tightening nuts on the side near the wall.

[0007] Preferably, a fixing clamping cavity for attaching and supporting the steel plates on both sides is provided between the steel plates on both sides.

[0008] Preferably, the end retainers on both sides are detachably threaded onto both ends of the connecting rod via screws.

[0009] Preferably, one end of the screw is provided with a free adjustment end with a length of 300mm, and the inner walls of both ends of the connecting rod are provided with an internal threaded structure that corresponds to the free adjustment end and is used to adjust the length.

[0010] A construction method for a temporary fixing device for a cantilever gable wall includes the following specific steps: Step 1: Remove the rotten wood structure inside the cantilever gable structure, so that the cantilever gable structure on both sides loses its lateral support and forms a cantilever state; Step 2: Mark the positions according to the floor level and horizontal spacing, and pre-install the end fixing devices at the corresponding positions on both gable walls; Step 3: Select the corresponding horizontal connecting rod, connect both ends of the connecting rod to the corresponding screws on both sides, and tighten the screw nuts to make the steel plate fit tightly against the cantilever gable wall structure to complete the locking. Step 4: Starting from the foundation, proceed sequentially to the roof layer, constructing reinforced concrete layer by layer to obtain a reinforced structure to replace the rotten wood structure inside; Step 5: After the concrete strength of the current layer reaches the design strength, remove this layer and carry out reinforcement and support replacement layer by layer from bottom to top.

[0011] Preferably, in step two, the lateral spacing is controlled to be 1.5-2m.

[0012] Preferably, when the span of the cantilever gable structure is ≥3m, at least one reinforcing rib is added from the middle of the central connecting rod to the two side rods to improve the overall tie stiffness.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This temporary fixing device for cantilever gable walls can achieve the binding and restraint of cantilever gable walls by combining the end fixing device with the middle connecting rod. It can better preserve the appearance of the historical brick wall, solve the problem of irreversible damage to the wall caused by traditional support, and at the same time, it does not occupy indoor construction space and avoids cross-interference with the internal frame reinforcement process. 2. This invention, through a layer-by-layer support replacement construction method, can precisely control the verticality of the wall, realize the continuous operation of reinforcement and support replacement from bottom to top, and the device is highly versatile, easy to assemble and disassemble and can be reused, significantly improving the continuity and economy of construction, and effectively solving the collapse risk of high cantilevered gable walls during reinforcement. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the end retainer of the present invention.

[0015] The meanings of the labels in the diagram are as follows: 1. Cantilever gable structure; 2. Central connecting rod; 3. End fixing device; 31. Steel plate; 32. Tightening nut; 33. Screw; 4. Reinforcing structure. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-2 The present invention will describe the above technical solution in detail through the following embodiments: like Figure 1 , Figure 2 As shown, this invention discloses a temporary fixing device for cantilever gable walls, which is mainly used in urban renewal and reinforcement and renovation projects of old brick and wood structures in historical and cultural blocks. It is suitable for temporary tie-and-fixing of gable walls on both sides in a cantilevered state after the removal of the rotten wooden structure inside. It can achieve tension constraint without damaging the historical wall and complete the replacement and reinforcement of the reinforced concrete inner frame in conjunction with the layer-by-layer replacement and support construction.

[0018] The device is a horizontally tensioned composite structure, mainly composed of a central connecting rod 2 and two sets of end fasteners 3. The central connecting rod 2 is horizontally arranged between the two cantilever gable structures 1. The two sets of end fasteners 3 are respectively installed at the two ends of the central connecting rod 2. They are used to apply tension constraints to the two cantilever gable structures 1 at the same elevation position, restricting the wall from tilting, tilting outward, cracking or collapsing, and ensuring the structural stability throughout the construction process. The end fasteners 3 and the central connecting rod 2 are connected by a detachable threaded connection, which is convenient for on-site assembly, adjustment and reuse.

[0019] Specifically, the end fixing device 3 includes a screw 33, two steel plates 31, and two tightening nuts 32. The screw 33 is machined with a suitable external thread, and the two tightening nuts 32 are coaxially threaded on the screw 33. The two steel plates 31 are slidably inserted into the screw 33 and are coaxially fixedly connected to the side of the two tightening nuts 32 closest to the wall. A fixing clamping cavity is formed between the two steel plates 31. During construction, by rotating the tightening nuts 32, the steel plates 31 can be pushed to move along the axial direction of the screw 33 and tightly adhere to the wall surface of the cantilever gable structure 1, achieving non-damaging clamping and fixing, avoiding irreversible damage to the historical brick wall, and meeting the requirements of cultural relic protection and preservation of historical building style.

[0020] In this embodiment, the screw 33 is provided with a 300mm long free adjustment end near the middle connecting rod 2. The inner walls of both ends of the middle connecting rod 2 are machined with internal threaded structures that match the free adjustment end. The threading depth is not less than 300mm. Through the cooperation of the free adjustment end and the internal threaded structure, the overall length of the device can be continuously adjusted, which can adapt to cantilever gable structures 1 with different bay widths, thereby improving the versatility and on-site adaptability of the device.

[0021] For cantilever gable structures 1 with different spans, the connecting rod 2 in this embodiment adopts a modular design, and different length specifications such as 1m, 1.5m, 2m, 2.5m, 3m, and 3.5m can be selected according to the actual span, which can cover the reinforcement needs of spans within 6m. When the span of the cantilever gable structure 1 is not less than 3m, at least one reinforcing rib is added from the middle to the two sides of the connecting rod 2. The rib can be 50mm×90mm×5mm in size, and a 500mm long reinforcing pad can be added in the middle to improve the overall tensile stiffness and flexural deformation resistance of the connecting rod 2, and ensure the fixed safety of large-span, high cantilever gables.

[0022] The present invention also provides a construction method for a temporary fixing device for a cantilever gable wall, applicable to the aforementioned temporary fixing device for a cantilever gable wall, and the specific implementation process is as follows: First, the wall is cantilevered. All the rotten, insect-infested, and ineffective interior wooden structural components on the inside of the cantilever gable wall structure 1 are removed, so that the cantilever gable wall structure 1 on both sides loses its original lateral support and forms an independent cantilever stress state, providing working space for the subsequent construction of the reinforced concrete inner frame.

[0023] Subsequently, the vertical installation position is determined according to the building floor elevation. In this embodiment, the corresponding positions of the cantilever gable structure 1 on both sides are marked with a horizontal spacing of 2m. The end fixing device 3 is pre-installed at the positioning position, and the screw 33 is initially positioned so that the steel plate 31 is attached to the wall surface but no locking force is applied at the moment to ensure the accurate position of the device.

[0024] Based on the actual span of the cantilever gable structure 1 on both sides, a central connecting rod 2 of the corresponding length is selected. The two ends of the central connecting rod 2 are respectively threaded to the freely adjustable ends of the screws 33 of the end fixing devices 3 on both sides. By rotating the central connecting rod 2, the overall length of the fine-tuning device is adjusted to keep the device horizontal and aligned. Then, the screw nuts 32 on both sides are tightened simultaneously to push the steel plate 31 to press tightly against the wall surface of the cantilever gable structure 1, thereby completing the locking constraint and keeping the wall in a designed vertical and stable state.

[0025] After the device is installed, the construction starts from the building foundation and proceeds from bottom to top to construct the first floor, the second floor and the roof layer of reinforced concrete structure, forming a reinforced structure 4 that replaces the original rotten wood structure. Throughout the construction process, the temporary fixing device continuously provides reliable lateral tie support for the cantilever gable structure 1 to resist adverse effects such as construction disturbance, wind load and uneven settlement of the foundation.

[0026] Once the concrete strength of the reinforcement structure 4 in the current construction layer reaches the design strength grade, the reinforcement structure 4 in this layer will have sufficient lateral bearing capacity. The temporary fixing devices for this layer can then be removed. Following a bottom-up, layer-by-layer reinforcement and support replacement sequence, a continuous construction process will be implemented until the entire roof reinforcement construction is completed. Throughout the entire support replacement process, the cantilever gable wall structure 1 remains stable and controllable, with verticality deviation controlled within the allowable range specified in the code, thus preserving the original wall structure intact.

[0027] This device and construction method can effectively solve the problems of traditional temporary fixing measures such as steel pipe bracing, guy ropes, and steel slab supports occupying indoor construction space, damaging historical walls, having poor adjustment capabilities, being unable to replace supports layer by layer, and having components that cannot be reused. It has the advantages of convenient installation and disassembly, flexible length adjustment, non-damaging fixing, reusability, and suitability for layer-by-layer construction. It can balance construction safety, protection of historical buildings, and construction efficiency, and is suitable for temporary fixing of cantilever gable walls in the replacement and renovation of the internal frame of various old brick and wood structure buildings.

[0028] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A temporary fixing device for a cantilever gable wall, characterized in that: It includes a central connecting rod (2) horizontally set between the two cantilever gable structures (1), and end fixing devices (3) installed at both ends of the central connecting rod (2). The end retainer (3) is used to tension and constrain the cantilever gable structure (1) on both sides and is located at the same elevation. The end retainer (3) includes a screw (33) with two screw nuts (32) threaded on, and two steel plates (31) that are slidably inserted on the screw (33) and coaxially connected to the screw nuts (32) near the wall.

2. The temporary fixing device for cantilever gable walls as described in claim 1, characterized in that: A fixing clamping cavity for attaching and supporting the steel plates (31) on both sides is provided between them.

3. The temporary fixing device for cantilever gable walls as described in claim 1, characterized in that: The end retainers (3) on both sides are detachably threaded onto both ends of the middle connecting rod (2) via screws (33).

4. The temporary fixing device for cantilever gable walls as described in claim 1, characterized in that: The screw (33) has a free adjustment end with a length of 300mm at one end, and the inner walls of both ends of the connecting rod (2) are provided with an internal thread threading structure that corresponds to the free adjustment end and is used to adjust the length.

5. A construction method for a temporary fixing device for a cantilever gable wall, applicable to the temporary fixing device for a cantilever gable wall as described in any one of claims 1-4, characterized in that: The specific steps include the following: Step 1: Remove the rotten wood structure inside the cantilever gable structure (1) so that the cantilever gable structures (1) on both sides lose lateral support and form a cantilever state; Step 2: Mark the positions according to the floor level and horizontal spacing, and pre-install the end fixing devices (3) at the corresponding positions on both sides of the gable wall. Step 3: Select the corresponding horizontal specification of the middle connecting rod (2), connect the two ends of the middle connecting rod (2) to the corresponding screws (33) on both sides respectively, and tighten the screw nut (32) to make the steel plate (31) fit tightly against the cantilever gable structure (1) wall surface to complete the locking; Step 4: Starting from the foundation, proceed sequentially to the roof layer, constructing reinforced concrete layer by layer to obtain a reinforced structure to replace the rotten wood structure inside the building (4). Step 5: After the concrete strength of the current layer reinforcement structure (4) reaches the design value, remove the current layer and reinforce and replace the supports layer by layer from bottom to top.

6. The construction method of the temporary fixing device for cantilever gable wall as described in claim 5, characterized in that: In step two, the lateral spacing is controlled to be 1.5-2m.

7. The construction method of the temporary fixing device for cantilever gable wall as described in claim 5, characterized in that: When the span of the cantilever gable structure (1) is ≥3m, at least one reinforcing rib is added from the middle part of the central connecting rod (2) to the two side rods to improve the overall tie stiffness.

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