Method for installing steel structure in a reinforced concrete structural shear wall

Abstract

This invention discloses a method for installing steel structures within a reinforced concrete shear wall, comprising: pouring a foundation pad; measuring and marking out the foundation pad to determine the installation position of the steel structure frame; calculating the foundation information of the steel structure frame based on relevant information of the steel structure to be installed within the shear wall; installing the steel structure frame on the foundation pad according to the foundation information and installation position, and binding reinforcing bars at the bottom of the steel structure frame; initially fixing the steel structure to be installed within the shear wall onto the steel structure frame; measuring and positioning the steel structure frame and the steel structure within the shear wall, and welding the steel structure frame and the steel structure within the shear wall together after confirming the correct installation position; and pouring concrete after installing foundation formwork on the outside of the steel structure frame and the steel structure within the shear wall to form a reinforced concrete shear wall. This invention reduces steel material waste during shear wall construction, effectively reduces construction difficulty, and facilitates subsequent construction.

Description

Technical Field

[0001] This invention relates to the field of construction industry, and in particular to a method for installing steel structures within a reinforced concrete shear wall. Background Technology

[0002] According to design requirements, steel plates need to be installed inside the shear walls or frame columns of reinforced concrete main structures. The following example uses a straight steel plate shear wall: The straight shear wall has concealed columns at both ends, with a cross-sectional dimension of 1.5m * 1.5m. The middle wall is 1m thick. The steel plates inside the concealed columns at both ends are I-beam steel structures with a height of 750mm-900mm, and the middle wall surface of the concealed columns at both ends contains a 10mm-20mm thick steel plate. According to specifications, the steel plates inside the wall must be embedded 2Hc (Hc is the height of the concealed column I-beam) within the bottom foundation. In actual construction, the foundation pad is poured first, the position of the steel structure is measured and marked, and anchor bolts are used to fix the steel structure to the foundation pad. The height of the steel structure extends beyond the top surface of the foundation. When constructing using this method, the steel structure embedded within the foundation increases significantly with the foundation height, far exceeding the 2Hc requirement specified in the code, resulting in a large waste of steel. The bottom reinforcement of the foundation is generally designed as continuous reinforcement. However, since the steel structure is directly installed on the ground, the foundation reinforcement cannot be laid out continuously. Therefore, it is necessary to reserve lap plates or weld sleeves on the steel structure to ensure the layout of the reinforcement. However, this method further increases the construction difficulty and the investment of manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to provide a method for installing steel structures within a reinforced concrete shear wall, which can reduce material waste and lower the difficulty of construction.

[0004] This invention is implemented as follows: a method for installing steel structures within a reinforced concrete shear wall, comprising the following steps:

[0005] S1. Pour the foundation pad layer, measure and mark the foundation pad layer to determine the installation position of the steel structure frame, and calculate the foundation information of the steel structure frame by combining the relevant information of the steel structure in the shear wall to be installed.

[0006] S2. Based on the basic information and the installation position, install the steel structure frame on the foundation pad to form the steel structure frame, and tie the steel bars at the bottom of the steel structure frame;

[0007] S3. Initially fix the steel structure inside the shear wall to be installed onto the steel structure frame;

[0008] S4. Measure and position the steel structure frame and the steel structure inside the shear wall. After confirming that the installation position is correct, weld the steel structure frame and the steel structure inside the shear wall together.

[0009] S5. After installing the foundation formwork on the outside of the steel structure frame and the shear wall, pour concrete until the concrete is formed. Then remove the foundation formwork to form the concrete shear wall.

[0010] Optionally, the relevant information of the steel structure within the shear wall includes the size, weight, elastic modulus, and moment of inertia of the steel columns; the foundation information includes the height of the steel structure frame and the number of supporting angle steels; and the foundation information of the steel structure frame calculated by combining the relevant information of the steel structure within the shear wall to be installed includes:

[0011] Based on the size and weight of the steel columns in the steel structure within the shear wall, the number of supporting angle steels required for the steel structure frame is determined through stress calculations.

[0012] The height of the steel structure frame is calculated based on the embedded length of the steel structure within the foundation of the shear wall.

[0013] Optionally, the calculation process for the number n of supporting angle steels satisfies the following formula:

[0014]

[0015] Where δ represents the deflection of a single supporting angle steel, L represents the length of a single supporting angle steel, E represents the elastic modulus of the supporting angle steel, I represents the moment of inertia of the supporting angle steel section, m represents the weight of the steel structure within the shear wall, and g represents the acceleration due to gravity. This indicates rounding down to the nearest integer.

[0016] Optionally, the steel structure frame includes multiple vertical support angle steels and multiple horizontal support angle steels. The top of the vertical support angle steels is welded to the bottom of the steel structure inside the shear wall, and the bottom of the vertical support angle steels is welded to the foundation pad layer. The horizontal support angle steels are respectively installed at the top, midpoint, and bottom of the vertical support angle steels.

[0017] Optionally, horizontally arranged steel plates are installed at both the top and bottom of the vertical support angle steel.

[0018] Optionally, the steel structure inside the shear wall is fixed to the steel structure frame by guy ropes, and the guy ropes are installed on at least three sides of the steel structure inside the shear wall.

[0019] Optionally, if the height of the steel structure inside the shear wall is greater than the preset height, the bottom end of the steel structure inside the shear wall is inserted into the foundation pad layer to enhance stability.

[0020] Optionally, the welding method for the steel structure inside the shear wall and the steel structure frame is to use semi-automatic solid wire CO2 gas shielded welding, GMAW-CO2 welding.

[0021] The present invention relates to an installation method for steel structures within reinforced concrete shear walls. By installing steel structure frames at the bottom of the steel structure within the shear wall to support it, the length of the steel structure embedded in the foundation can be adjusted while meeting the specifications, thus avoiding material waste. Furthermore, the use of a split installation method to fix the steel structure within the shear wall effectively reduces construction difficulty. Moreover, the placement of long reinforcing bars after installation is not affected by the steel structure within the shear wall, facilitating subsequent construction. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the steel structure inside the shear wall in the installation method of the steel structure inside the shear wall of the reinforced concrete structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the steel structure fixed within the shear wall by guy ropes in the installation method of the steel structure within the shear wall of the reinforced concrete structure of the present invention.

[0024] Figure 3 This is a flowchart of the installation method of the steel structure inside the shear wall of the reinforced concrete structure according to the present invention.

[0025] Label Explanation:

[0026] 1. Steel structure within shear walls;

[0027] 2. Foundation padding;

[0028] 3. Steel structure frame;

[0029] 4. Guy ropes. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Please see Figures 1 to 3 This invention provides a method for installing steel structures within a reinforced concrete shear wall, comprising the following steps:

[0032] S1. Pour the foundation pad layer, measure and lay out the foundation pad layer to determine the installation position of the steel structure frame, and calculate the foundation information of the steel structure frame by combining the relevant information of the steel structure inside the shear wall to be installed.

[0033] In some embodiments, the relevant information of the steel structure within the shear wall includes the size, weight, elastic modulus, and moment of inertia of the steel columns; the basic information includes the height of the steel structure frame and the number of supporting angle steels; and the calculation of the basic information of the steel structure frame by combining the relevant information of the steel structure within the shear wall to be installed includes:

[0034] Based on the size and weight of the steel columns in the steel structure within the shear wall, the number of supporting angle steels required for the steel structure frame is determined through stress calculations.

[0035] The height of the steel structure frame is calculated based on the embedded length of the steel structure within the foundation of the shear wall.

[0036] Specifically, since the specifications of the shear wall to be constructed are known, the relevant information of the steel structure 1 within the shear wall is also available. After the foundation pad 2 is poured and formed, the foundation information of the steel structure frame 3 to be welded can be calculated based on the relevant information of the steel structure 2 within the shear wall. This includes the number of supporting angle steels used in the steel structure frame 3 and the height of the steel structure frame 3. The number n of supporting angle steels used must at least satisfy the following:

[0037]

[0038] For example, to facilitate calculation and minimize the practical use of supporting angle steel, the calculation process for the number of supporting angle steel, n, satisfies the following formula:

[0039]

[0040] Where δ represents the deflection of a single supporting angle steel, L represents the length of a single supporting angle steel, E represents the elastic modulus of the supporting angle steel, I represents the moment of inertia of the supporting angle steel section, m represents the weight of the steel structure within the shear wall, and g represents the acceleration due to gravity. This indicates rounding down to the nearest integer.

[0041] S2. Based on the basic information and the installation location, install the steel structure frame on the foundation pad to form the steel structure frame, and tie the steel bars at the bottom of the steel structure frame.

[0042] In some embodiments, the steel structure frame 3 includes multiple vertical support angle steels and multiple horizontal support angle steels. The top of the vertical support angle steels is welded to the bottom of the steel structure inside the shear wall, and the bottom of the vertical support angle steels is welded to the foundation pad 2. The horizontal support angle steels are respectively installed at the top, midpoint and bottom of the vertical support angle steels.

[0043] Specifically, the materials used for the steel structure frame 3 are the same as those used for the steel structure within the shear wall. Supporting angle steel and welded steel plates are employed, with equal-length welded supporting angle steel serving as supports for the steel structure frame. At the very top of the steel structure frame, horizontally welded angle steel is used to fix and connect the supporting angle steel into a single unit. To prevent instability of the supporting angle steel due to excessive height of the steel structure frame, additional horizontal supporting angle steel is welded at the midpoint of the frame's height and at the very bottom for further fixation.

[0044] Furthermore, horizontally arranged steel plates are installed at the top and bottom of the vertical support angle steel. In order to enhance the stability of the steel structure frame, a steel plate is installed on the support angle steel at both the top and bottom of the steel structure frame for support, so as to ensure that the steel structure frame is more stable.

[0045] S3. Initially fix the steel structure inside the shear wall to be installed onto the steel structure frame.

[0046] In some embodiments, reference Figure 2 The steel structure 1 inside the shear wall is fixed to the steel structure frame 3 by guy ropes 4, and the guy ropes 4 are installed on at least three sides of the steel structure 3 inside the shear wall.

[0047] S4. Measure and position the steel structure frame and the steel structure inside the shear wall. After confirming that the installation position is correct, weld the steel structure frame and the steel structure inside the shear wall together.

[0048] For details, please refer to Figure 1 and Figure 2 The location of the steel structure frame 3 is measured and marked out. Anchor bolts are used to fix the steel structure frame 3 to the foundation pad 2 at the bottom. Then, the bottom reinforcement of the foundation pad 2 is tied, passing through the gaps in the angle steel of the frame to prevent interference. The steel structure 1 inside the shear wall is hoisted onto the frame and temporarily fixed using guy ropes 4. To ensure the stability of the steel column installation, guy ropes 4 must be installed on at least three sides. After confirming that the axial position is correct, the bottom of the concealed column of the steel structure 1 inside the shear wall is directly welded to the top steel plate of the steel structure frame 3. The steel structure frame 3 is set at the bottom of the concealed columns at both ends of the shear wall, realizing the steel structure's suspended installation within the foundation, ensuring that the steel structure meets the 2Hc anchorage length requirement (Hc is the height of the concealed column I-beam).

[0049] After the concealed columns of steel structure 1 within the shear wall are installed in the foundation pad 2, the top surface reinforcement of the foundation needs to be tied. At this time, the top surface reinforcement of the foundation cannot pass through due to the steel structure 1 within the shear wall. Therefore, during the fabrication stage of steel structure 1 within the shear wall, it is advisable to reserve lap plates at the locations where the reinforcement cannot pass through. The lap plates are set horizontally and welded to the concealed columns of steel structure 1 within the shear wall. Then, the reinforcement is disconnected at the locations where it cannot pass through the steel structure and welded to the reserved lap plates of steel structure 1 within the shear wall. Considering the requirements of the reinforcement welding connection specifications (single-sided welding 10 times the diameter of the reinforcement, double-sided welding 5 times the diameter of the reinforcement), the length of the lap plate can be slightly greater than the minimum welding length of the reinforcement. This avoids insufficient welding length of the reinforcement due to errors in reinforcement cutting or steel structure installation, thereby ensuring the load-bearing capacity of the foundation after the continuous reinforcement is disconnected.

[0050] S5. After installing the foundation formwork on the outside of the steel structure frame and the shear wall, pour concrete until the concrete is formed. Then remove the foundation formwork to form the concrete shear wall.

[0051] In some embodiments, when the height of the steel structure within the shear wall is greater than a preset height, the bottom end of the steel structure within the shear wall is inserted into the foundation pad to enhance stability. Specifically, when the main story height of the steel structure 1 within the shear wall is too high, part of the steel structure 1 within the shear wall is located underground and inserted into the concrete of the foundation pad 2, while the other part is located above ground. Considering safety issues during the installation of the steel structure 1 within the shear wall, the steel column of the steel structure 1 within the shear wall can be divided into two sections. To facilitate welding operations at the disassembled parts of the steel column, the joint is set at a position 1.3m above the top of the foundation pad 2. When welding the disassembled parts at this position, the welder can stand on the top surface of the foundation and weld directly, making construction convenient.

[0052] In some embodiments, the welding of the steel structure 1 within the shear wall and the steel structure sleeve 3 both employ semi-automatic solid wire CO2 gas shielded welding, specifically GMAW-CO2. Based on the on-site welding characteristics of the steel structure 1 within the shear wall and considering factors such as welding quality, welding speed, ease of operation, all-position welding performance, and wind resistance of various welding methods, all welding locations are welded using a combination of semi-automatic solid wire CO2 gas shielded welding (GMAW-CO2) as the primary welding method, supplemented by semi-automatic flux-cored wire CO2 gas shielded welding (FCAW-G). GMAW welding has a higher deposition efficiency than FCAW, but it is more significantly affected by the welding position and environmental factors. Therefore, both methods are used based on on-site requirements and conditions. SMAW is selected as a supplementary welding method, primarily for root pass welding (due to its high penetration), tack welding, and some repairs and rework.

[0053] The present invention relates to an installation method for steel structures within reinforced concrete shear walls. By installing steel structure frames at the bottom of the steel structure within the shear wall to support it, the length of the steel structure embedded in the foundation can be adjusted while meeting the specifications, thus avoiding material waste. Furthermore, the use of a split installation method to fix the steel structure within the shear wall effectively reduces construction difficulty. Moreover, the placement of long reinforcing bars after installation is not affected by the steel structure within the shear wall, facilitating subsequent construction.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of installing a steel structure in a reinforced concrete structural shear wall, characterized by, Includes the following steps: S1. Pour the foundation pad layer. Measure and mark the foundation pad layer to determine the installation position of the steel structure frame. The steel structure frame includes multiple vertical and horizontal support angle steels. The top of the vertical support angle steels is welded to the bottom of the steel structure within the shear wall, and the bottom of the vertical support angle steels is welded to the foundation pad layer. The horizontal support angle steels are respectively installed at the top, midpoint, and bottom of the vertical support angle steels. Calculate the foundation information of the steel structure frame by combining relevant information of the steel structure within the shear wall to be installed. The relevant information of the steel structure within the shear wall includes the size, weight, elastic modulus, and moment of inertia of the steel columns. The foundation information includes the height of the steel structure frame and the number of support angle steels. Calculating the foundation information of the steel structure frame by combining relevant information of the steel structure within the shear wall to be installed includes: determining the number of support angle steels required for the steel structure frame through stress calculation based on the size and weight of the steel columns within the shear wall; and calculating the height of the steel structure frame based on the embedment length of the steel structure within the foundation. S2. Based on the basic information and the installation position, install the steel structure frame on the foundation pad to form the steel structure frame, and tie the steel bars at the bottom of the steel structure frame; S3. Initially fix the steel structure inside the shear wall to be installed onto the steel structure frame; S4. Measure and position the steel structure frame and the steel structure inside the shear wall. After confirming that the installation position is correct, weld the steel structure frame and the steel structure inside the shear wall together. S5. After installing the foundation formwork on the outside of the steel structure frame and the shear wall, pour concrete until the concrete is formed. Then remove the foundation formwork to form the concrete shear wall.

2. The method of installing an inner steel structure of a ductile concrete structural shear wall according to claim 1, characterized by, The calculation process for the number n of supporting angle steels satisfies the following formula: wherein, represents the deflection of a single said bracing angle, L is the length of a single said bracing angle, E is the modulus of elasticity of said bracing angle, I is the cross-sectional moment of inertia of said bracing angle, m is the weight of the steel structure within said shear wall, and g represents the acceleration due to gravity, represents the floor-to-floor story height of the building.

3. The method for installing steel structures within reinforced concrete shear walls according to claim 1, characterized in that, The vertical support angle steel is equipped with horizontally arranged steel plates at both the top and bottom.

4. The method for installing steel structures within reinforced concrete shear walls according to claim 1, characterized in that, The steel structure inside the shear wall is fixed to the steel structure frame by guy ropes, and the guy ropes are installed on at least three sides of the steel structure inside the shear wall.

5. The method for installing steel structures within reinforced concrete shear walls according to claim 1, characterized in that, When the height of the steel structure inside the shear wall is greater than the preset height, the bottom end of the steel structure inside the shear wall is inserted into the foundation pad layer to enhance stability.

6. The method for installing steel structures within reinforced concrete shear walls according to claim 1, characterized in that, The welding of the steel structure within the shear wall and the steel structure frame both adopt semi-automatic solid wire CO2 gas shielded welding, specifically GMAW-CO2 welding.

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