A method for controlling the strength of a prefabricated building concrete module structure

Abstract

The present application relates to the field of modular integrated building, and more particularly to a method for controlling the structural strength of prefabricated building concrete modules, comprising: embedding one or more sets of steel reinforcing loops arranged in pairs on the inner side of the two short side walls of a trihedral or tetrahedral structure; after the trihedral or tetrahedral structure is demoulded, obtaining a rated pre-tightening force value through simulation analysis, selecting a pre-stressed wire bundle assembly that meets the structural strength according to the rated pre-tightening force value, and connecting the pairs of steel reinforcing loops using the pre-stressed wire bundle assembly; and applying a rated pre-tightening force to the pre-stressed wire bundle to resist the tendency of the two short side walls of the trihedral or tetrahedral structure to expand outward. The method covers key links such as the transfer and hoisting of building modules, realizes stable support of the trihedral or tetrahedral structure throughout the entire process, effectively controls the outward expansion and deformation of the short side walls of the trihedral or tetrahedral structure, and enables the precise hoisting work of prefabricated building concrete projects to proceed smoothly and efficiently.

Description

Technical Field

[0001] This invention relates to the field of modular integrated buildings, and more particularly to a method for controlling the strength of prefabricated building concrete module structures. Background Technology

[0002] Modular integrated building refers to a construction method that breaks down a building into independent functional modules through standardized design, prefabricates them in a factory, and then transports them to the site for rapid assembly. Its core significance lies in significantly shortening the construction period, reducing resource waste and environmental pollution through industrialized production, while simultaneously improving the controllability of building quality. It also boasts advantages such as high energy efficiency, flexibility, and scalability.

[0003] The functional modules that make up modular integrated buildings include numerous trihedral and tetrahedral structures. Specifically, a trihedral structure refers to a U-shaped building wall unit module consisting of two short walls and one long wall. A tetrahedral structure is a trihedral structure with an additional long wall. The bottom of the short walls of both trihedral and tetrahedral structures has pre-embedded steel reinforcement connection holes. During on-site integration and installation, the trihedral and tetrahedral structures need to be hoisted onto the installation surface, and the pre-embedded steel reinforcement connection holes must be aligned with the pre-embedded steel reinforcement on the installation surface to form a reliable and effective connection.

[0004] The main technical problem with existing technologies is that after demolding, the long sides of these trihedral and tetrahedral structures, lacking walls, are relatively weak and lack reinforcement. During transfer, transportation, and hoisting, the short walls are prone to outward deformation, making it difficult to connect with the embedded reinforcing bars during placement. Corresponding adjustments to the reinforcing bars and structural repairs are extremely costly in terms of manpower and resources, slowing down construction and even affecting project quality. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] This invention provides a method for controlling the strength of prefabricated building concrete module structures, aiming to solve the deformation problem of integrated building module trihedral or tetrahedral structures during transfer and hoisting.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this invention proposes a method for controlling the strength of prefabricated building concrete module structures, comprising:

[0009] S1. One or more sets of paired steel bar tie rings are pre-embedded on the inner side of the two short side walls of a trihedral or tetrahedral structure.

[0010] S2. After demolding of the trihedral or tetrahedral structure, the rated prestressing force value is obtained through simulation analysis. Based on the rated prestressing force value, a prestressed wire harness assembly that meets the structural strength is selected, and the prestressed wire harness assembly is used to connect the paired steel bar pull rings.

[0011] S3. Apply a rated prestressing force to the prestressed wire bundle to resist the tendency of the two short side walls of the trihedral or tetrahedral structure to expand outward.

[0012] A further technical solution is that the prestressed wire harness assembly includes turnbuckles, wire ropes, and U-shaped shackles;

[0013] The steps for connecting pairs of rebar tie rings using a prestressed wire harness assembly include:

[0014] Connect turnbuckles and wire ropes to pairs of steel bar pull rings using U-shaped shackles. Then connect the free ends of the turnbuckles and wire ropes and tighten the turnbuckles with a torque wrench to further tension the wire ropes.

[0015] A further technical solution involves determining the torque value of the torque wrench using the following steps:

[0016] Suspend the demolded trihedral or tetrahedral structure in the air and use a regular wrench or pry bar to rotate the turnbuckle until the steel wire rope is initially tensioned.

[0017] By repeatedly adjusting the working torque of the torque wrench, the distance between the two short side walls of a trihedral or tetrahedral structure under tension with multiple torque values ​​is obtained. Based on the correspondence between the torque value and the distance value, a fitting curve is obtained. The torque value applied when the deformation is 2-5mm is selected as the standard torque value on the fitting curve.

[0018] A further technical solution involves obtaining the rated preload value through the following steps:

[0019] A parametric model of a trihedral or tetrahedral structure is established based on finite element simulation. The elastic modulus of concrete and the module size parameters are input to simulate the outward expansion deformation of the short side wall under transportation and hoisting conditions. Then, the minimum preload threshold required to suppress the target deformation is determined by reverse iterative calculation, and a safety margin of 20%-30% is added as the rated preload.

[0020] A further technical solution involves placing the precast steel structure main body with connecting steel bar rings into the mold before concrete pouring, and supporting the mold at the position corresponding to the steel bar rings, so that the steel bar rings of the cast trihedral or tetrahedral structure form recessed installation holes, which are used to provide space for the installation of prestressed wire harness components.

[0021] A further technical solution is that, when it is a trihedral structure, there are two sets of steel bar tie rings, which are respectively set on the short side wall of the trihedral structure near the side without walls, and the distance from the bottom of the module is 350-500mm.

[0022] When it is a tetrahedral structure, the steel reinforcement rings are set as a group and are placed on the short side wall of the tetrahedral structure near the side without walls, and the distance from the bottom of the module is 350-500mm.

[0023] A further technical solution involves installing diagonal bracing rods at the two apex corners of the wallless side of the trihedral or tetrahedral structure.

[0024] A further technical solution involves releasing the turnbuckles and removing the U-shaped shackles after the trihedral or tetrahedral structure has been hoisted and positioned, thereby disassembling the prestressed wire harness assembly for future use.

[0025] A further technical solution involves covering the surface of the wire rope with an anti-corrosion coating or a galvanized layer, and applying an anti-rust lubricant to the connection between the turnbuckle and the U-shaped shackle.

[0026] (III) Beneficial Effects

[0027] The beneficial effects of this invention are:

[0028] Trihedral or tetrahedral structures, due to their large spans of long side walls, are prone to significant deformation during transport and hoisting, which can affect the fixed installation of modular building units. This invention addresses all key stages, including demolding, hoisting, transportation, and on-site hoisting, achieving stable support for the modular structure throughout the entire process. It effectively controls the outward expansion deformation of short side walls, enabling the smooth and efficient progress of precise hoisting in prefabricated concrete projects. Using fixed-length steel wire ropes and turnbuckles as connecting devices results in a lightweight and compact design that does not negatively impact the structural strength of the enclosure. Especially during transportation, the flexibility of the steel wire ropes buffers vibrations, reducing the impact of road bumps and vehicle starts and stops on the modular structure. The device is simple and lightweight; the prestressed wiring harness assembly, including turnbuckles, steel wire ropes, and U-shaped shackles, consists of standard parts, making procurement convenient and cost-effective, simplifying the on-site installation process. The U-shaped shackles provide quick and reliable connections, reducing welding or complex anchoring processes, shortening the construction period, and reducing reliance on manual labor. The turnbuckles are tightened using a torque wrench, achieving digital control of the preload force and avoiding human error. The flexibility of wire ropes allows them to adapt to minute displacements, avoiding stress abrupt changes caused by rigid connections and improving structural toughness. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a tetrahedral structure;

[0030] Figure 2This is a schematic diagram of a trihedral structure;

[0031] Figure 3 This is a schematic diagram of the overall connection of the prestressed wire harness assembly;

[0032] Figure 4 An enlarged schematic diagram of the connection between a prestressed wire harness assembly with U-shaped shackles and a short side wall;

[0033] Figure 5 This is a schematic diagram of the fitting curve in Example 1.

[0034] Figure 6 An enlarged schematic diagram of the connection between a prestressed wire harness assembly with a fixed steel plate structure and a short sidewall;

[0035] Figure 7 This is an enlarged schematic diagram showing the connection between a prestressed wire harness assembly with a double-ear structure and a short sidewall.

[0036] [Explanation of Labels in the Attached Image]

[0037] 1: Short side wall; 2: Reinforcing bar tie ring; 3: Prestressed wire harness assembly; 31: Turnbuckle; 32: Steel wire rope; 33: U-shaped shackle; 34: Fixed steel plate structure; 35: Double wire lug structure; 4: Mounting hole; 5: Diagonal brace; Detailed Implementation

[0038] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] A method for controlling the strength of prefabricated building concrete module structures, such as Figures 1-4 As shown, the process includes: First, embedding one or more pairs of steel reinforcement rings on the inner side of the two short side walls of the trihedral or tetrahedral structure; Second, after demolding the trihedral or tetrahedral structure, obtaining the rated prestressing force value through simulation analysis, selecting a prestressed wire harness assembly that meets the structural strength requirements based on the rated prestressing force value, and connecting the pairs of steel reinforcement rings using the prestressed wire harness assembly; Third, applying the rated prestressing force to the prestressed wire harness to resist the tendency of the two short side walls of the trihedral or tetrahedral structure to expand outward.

[0040] The above scheme has the following effects: Pre-embedded paired steel reinforcement rings in the factory prefabrication stage of the trihedral or tetrahedral structure form internal anchor points, avoiding the damage to structural integrity caused by subsequent secondary splicing and providing better tensile strength. Symmetrical arrangement of double reinforcement rings can evenly distribute prestress, reduce local stress concentration, and improve the structure's resistance to deformation. Determining the rated prestressing force through post-demolding simulation further guides the selection of prestressed wire harness components, improving the reliability of strength control. Furthermore, it enables customized design to adapt to different module sizes and load requirements, enhancing the method's versatility. Applying prestressing force counteracts the outward expansion trend of the short side wall, transforming passive repair into active prevention, significantly improving the initial stiffness of the structure.

[0041] It should be noted that the trihedral structure consists of two short side walls perpendicularly connected to a top slab, forming a downward-facing U-shape. The tetrahedral structure adds a long side wall to the trihedral structure, which is perpendicular to all the short side walls and the top slab. The reinforcing bar tie rings can also be replaced with a double-ear structure. Specifically, the double-ear structure includes a female end prefabricated inside the concrete and a male end connected with a wire ring. The male and female ends are connected by threads. This solution can compensate for the problem that the reinforcing bar tie rings are fixed in the concrete and cannot be reused.

[0042] The above-mentioned technical solution, by setting up prestressed wire harness components to pull the two short walls of the concrete module, eliminates the need for fixed supports or connecting rods in traditional solutions. This results in a lightweight structure, quick connection, and minimal space occupation. It effectively solves the problem of relatively weak structural strength on the long, unwalled sides of trihedral or tetrahedral structures after demolding, which, without reinforcement measures, easily leads to outward deformation of the short walls during transfer, transportation, and hoisting. Furthermore, the better flexibility of the prestressed wire harness components provides the structured module with better resistance to deformation and impact during hoisting or transportation, and avoids stress concentration issues.

[0043] Specifically, the prestressed wire harness assembly includes turnbuckles, wire ropes, and U-shaped shackles;

[0044] The steps for connecting pairs of rebar tie rings using a prestressed wire harness assembly include:

[0045] Connect turnbuckles and wire ropes to paired rebar rings using U-shaped shackles. Then, connect the free ends of the turnbuckles and wire ropes, and tighten the turnbuckles with a torque wrench to further tension the wire ropes. Specifically, the U-shaped shackle includes a U-shaped body, a cross pin, and a locking nut. During connection, the U-shaped body passes through the loop structure at the ends of the turnbuckle and wire rope. Afterward, the cross pin passes through the rebar ring or wire lug, and the locking nut is used for fixation. This allows for rapid installation and connection of the prestressed wire harness assembly, greatly improving on-site construction efficiency. Tightening the turnbuckles with a torque wrench helps control the torsional torque, preventing excessive torque from causing inward deformation of the short side wall and overloading of the turnbuckles.

[0046] Specifically, the steps for determining the torque value of a torque wrench include:

[0047] Suspend the demolded trihedral or tetrahedral structure in the air and use a regular wrench or pry bar to rotate the turnbuckle until the steel wire rope is initially tensioned.

[0048] By repeatedly adjusting the working torque of the torque wrench, the distance between the two short side walls of a trihedral or tetrahedral structure under tension with multiple torque values ​​is obtained. Based on the correspondence between the torque value and the distance value, a fitting curve is obtained. The torque value applied when the deformation is 2-5mm is selected as the standard torque value on the fitting curve.

[0049] Specifically, the steps for obtaining the rated preload value include:

[0050] A parametric model of a trihedral or tetrahedral structure is established based on finite element simulation. The elastic modulus of concrete and the module size parameters are input to simulate the outward expansion deformation of the short side wall under transportation and hoisting conditions. Then, the minimum preload threshold required to suppress the target deformation is determined by reverse iterative calculation, and a safety margin of 20%-30% is added as the rated preload.

[0051] Specifically, before concrete pouring, the precast steel structure body with connecting steel bar rings is placed in the mold, and the mold is supported at the position of the steel bar rings so that the steel bar rings of the cast trihedral or tetrahedral structure form recessed installation holes. The installation holes are used to provide space for the installation of prestressed wire harness components.

[0052] Specifically, when the structure is trihedral, there are two sets of steel reinforcement rings, which are respectively set on the short side wall of the trihedral structure near the side without walls, and the distance from the bottom of the module is 350-500mm; when the structure is tetrahedral, there is one set of steel reinforcement rings, which are respectively set on the short side wall of the tetrahedral structure near the side without walls, and the distance from the bottom of the module is 350-500mm.

[0053] In addition, diagonal bracing rods are installed at the two apex corners of the wallless side of the trihedral or tetrahedral structure. The surface of the wire rope is covered with an anti-corrosion coating or galvanized layer, and the connection between the turnbuckle and the U-shaped shackle is coated with anti-rust lubricant.

[0054] After the trihedral or tetrahedral structure is hoisted and positioned, the turnbuckles are released, the U-shaped shackles are removed, and the prestressed wire harness assembly is disassembled for future use.

[0055] In summary, the control method of this invention covers all key stages, including demolding, lifting, transportation, and on-site hoisting, achieving stable tension of the modular structure throughout the entire process. It effectively controls the outward deformation of the short side walls of trihedral or tetrahedral structures, enabling the smooth and efficient progress of precise hoisting in prefabricated concrete projects. Furthermore, the use of fixed-length steel wire ropes and turnbuckles as prestressed wire harness components results in a lightweight and compact overall design that does not negatively impact the structural strength of the module. Especially during transportation, the flexibility of the steel wire ropes buffers vibrations, reducing the impact of road bumps and vehicle starts and stops on the modular structure. Additionally, the device of this invention is simple in structure, lightweight, and allows for quick installation and disassembly. Compared to frequent observation and adjustment of remedial measures such as repositioning of reinforcing bars, it reduces manpower requirements and improves construction efficiency.

[0056] Example 1

[0057] This embodiment uses the strength control process of a tetrahedral structure as an example for illustration. The specific steps are as follows:

[0058] Before concrete pouring, the precast steel structure main body, connected with reinforcing bar rings, is placed in a mold. Formwork is then erected on the mold corresponding to the positions of the reinforcing bar rings, creating recessed installation holes at the reinforcing bar ring locations on the cast tetrahedral structure. These installation holes provide space for the installation of prestressed wire harness components. Specifically, the installation holes are cubic structures with sides of 100mm, and the reinforcing bar rings are positioned 350mm from the ground and 100mm from the side of the wall without a long side. Concrete is then poured. The completed tetrahedral structure has a long side of 7800mm and weighs approximately 30 tons.

[0059] After the tetrahedral structure has reached the required strength, the side formwork is removed. The rated preload value is obtained through simulation analysis. Based on the rated preload value, a prestressed wire harness assembly that meets the structural strength requirements is selected, and the prestressed wire harness assembly is used to connect paired rebar rings. Specifically, U-shaped shackles are used to connect fixed-length steel wire ropes to turnbuckles on the pre-embedded rebar rings on the two short walls. The turnbuckles are then loosened and connected to the steel wire ropes. The selection of turnbuckles, steel wire ropes, and U-shaped shackles must be based on the mechanical simulation of the tetrahedral structure. Specifically, the steps for obtaining the rated preload value include: establishing a parametric model of the tetrahedral structure based on finite element simulation; inputting the concrete elastic modulus and module size parameters; simulating the outward deformation of the short walls under transportation and hoisting conditions; then determining the minimum preload threshold required to suppress the target deformation through reverse iterative calculation; and adding a 30% safety margin as the rated preload. In this embodiment, calculations using SPA software show that M24 turnbuckles, 20mm steel wire rope, and U-shaped shackles with a load-bearing capacity of 4.5t are sufficient to meet the structural strength control requirements of the enclosure. A torque wrench with a specification of 40-350 N·m is also provided.

[0060] Next, using a regular wrench or pry bar, rotate the turnbuckle on the tetrahedral structure, which is in a suspended state, until the wire rope is initially tensioned.

[0061] Furthermore, the process of tensioning the wire rope requires two workers to operate simultaneously. One worker uses a pry bar to hold the U-shaped opening at the connection between the turnbuckle and the wire rope, while the other worker uses a torque wrench to perform the final tightening. This is to prevent the turnbuckle from deforming against torque due to the flexibility of the wire rope during the tightening process, which could lead to the final preload not reaching the effective value.

[0062] By repeatedly adjusting the working torque of the torque wrench, the distance between the two short side walls of a tetrahedral structure under tension at multiple torque values ​​was obtained. The specific experimental procedure is as follows:

[0063] First, adjust the torque wrench to 80 N·m, tighten the turnbuckle, and then measure and record the distance between the two short side walls of the tetrahedral structure. Next, increase the torque wrench value by 20 and conduct experiments on the new tetrahedral structure until the inward deformation of the tetrahedral structure approaches 0.2% of its length and does not exceed it. The experimental data are as follows:

[0064]

[0065] The fitted curve was obtained based on the data in the table above. See the specific reference below. Figure 5As shown, the torque value applied when the deformation is 2-5mm is selected as the standard torque value on the fitted curve. In this embodiment, the torque value of 150N·m corresponding to a deformation of 2mm is selected as the standard torque value. Then, the torque value of the torque wrench is fixed at 150N·m for the implementation of the preload of the tetrahedral structure of this model.

[0066] To ensure the accuracy of the standard torque value, multiple experiments can be conducted and the average value taken to obtain the standard torque value. After that, normal assembly procedures and production hoisting processes can be carried out.

[0067] In this embodiment, after the tetrahedral structure is demolded, lifted, stored, transported, and finally hoisted into place, the on-site construction personnel can release the turnbuckles and remove the U-shaped shackles on the short side walls to recycle the prestressed wire harness components for future use.

[0068] This embodiment achieved the following technical effects in project practice:

[0069] After adopting the above-mentioned strength control method, the average hoisting time is 19 minutes and the maximum hoisting time is 9 minutes. Compared with the traditional method of controlling structural strength through support frames, the average hoisting time (45 minutes) of the scheme in this embodiment is shortened by 58% and the efficiency is improved by 137%.

[0070] Example 2

[0071] The strength control object in this embodiment is a building module with a trihedral structure.

[0072] The difference from Example 1 is that the trihedral structure has one less long side wall compared to the tetrahedral structure, and the two short side walls require two sets of prestressed wire harness assemblies for tension.

[0073] Combined with appendix Figure 6 , Figure 7 In another embodiment, the U-shaped shackle 33 can be replaced by a fixed steel plate structure 34 or a double-ear structure 35.

[0074] It should be noted that all directional indicators in this embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0075] Furthermore, in this embodiment, the use of terms such as "first" and "second" is 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 as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this embodiment, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this embodiment, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0077] It should be understood that the above description of specific embodiments of the present invention is only for illustrating the technical approach and features of the present invention, and is intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for controlling the strength of prefabricated building concrete module structures, characterized in that, include: S1. One or more sets of paired steel tie rings (2) are pre-embedded on the inner side of the two short side walls (1) of the trihedral or tetrahedral structure. S2. After the trihedral or tetrahedral structure is demolded, the rated prestressing force value is obtained through simulation analysis. Based on the rated prestressing force value, a prestressed wire harness assembly (3) that meets the structural strength is selected, and the prestressed wire harness assembly (3) is used to connect the pairs of steel bar pull rings (2). S3. Apply a rated prestressing force to the prestressed wire bundle to resist the tendency of the two short side walls (1) of the trihedral or tetrahedral structure to expand outward.

2. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, The prestressed wire harness assembly (3) includes turnbuckles (31), wire ropes (32), and U-shaped shackles (33); The steps of connecting the pairs of steel bar tie rings (2) using the prestressed wire harness assembly (3) include: The turnbuckle (31) and the wire rope (32) are connected to the pair of steel bar pull rings (2) respectively by the U-shaped shackle (33). Then the free ends of the turnbuckle (31) and the wire rope (32) are connected, and the turnbuckle (31) is tightened by a torque wrench to further tension the wire rope (32).

3. The method for controlling the strength of prefabricated building concrete module structures as described in claim 2, characterized in that, The steps for determining the torque value of the torque wrench include: Suspend the demolded trihedral or tetrahedral structure in the air and use a regular wrench or pry bar to rotate the turnbuckle (31) until the steel wire rope (32) is initially tensioned. By repeatedly adjusting the working torque of the torque wrench, the distance between the two short side walls (1) of the trihedral or tetrahedral structure under tension using multiple torque values ​​is obtained. Based on the correspondence between the torque value and the distance value, a fitting curve is obtained. The torque value applied when the deformation is 2-5mm is selected as the standard torque value on the fitting curve.

4. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, The steps for obtaining the rated preload value include: Based on finite element simulation, a parameterized model of the trihedral or tetrahedral structure is established. The elastic modulus of concrete and the module size parameters are input to simulate the outward expansion deformation of the short side wall (1) under transportation and hoisting conditions. Then, the minimum preload threshold required to suppress the target deformation is determined by reverse iteration calculation, and a safety margin of 20%-30% is added as the rated preload.

5. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, Before concrete pouring, the precast steel structure body connected with the steel bar pull ring (2) is placed in the mold, and the mold is supported at the position of the steel bar pull ring (2) so that the steel bar pull ring (2) of the cast trihedral or tetrahedral structure forms a recessed installation hole (4), which is used to provide space for the installation of the prestressed wire harness assembly (3).

6. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, When it is a trihedral structure, the steel bar tie ring (2) is in two sets, respectively set on the short side wall (1) of the trihedral structure near the side without wall, and the distance from the bottom of the module is 350-500mm. When it is a tetrahedral structure, the steel bar tie ring (2) is a set and is set on the short side wall (1) of the tetrahedral structure near the side without wall, and the distance from the bottom of the module is 350-500mm.

7. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, Diagonal bracing rods (5) are installed at the two apex corners of the wallless side of the trihedral or tetrahedral structure.

8. The method for controlling the strength of prefabricated building concrete module structures as described in claim 1, characterized in that, After the trihedral or tetrahedral structure is hoisted and positioned, the turnbuckle (31) is released, the U-shaped shackle (33) is removed, and the prestressed wire harness assembly (3) is disassembled for future use.

9. The method for controlling the strength of prefabricated building concrete module structures as described in claim 2, characterized in that, The surface of the wire rope (32) is covered with an anti-corrosion coating or a galvanized layer, and the connection between the turnbuckle (31) and the U-shaped shackle (33) is coated with an anti-rust lubricant.

Images