CN116717101A - BAPV reinforcement system and construction methods for existing buildings - Google Patents

Abstract

The invention relates to a BAPV reinforcement system and a construction method for an existing building. It belongs to the field of construction technology and includes a number of parallel steel beams distributed at equal intervals. Steel columns are provided at both ends of the steel beams, and there are steel columns between the upper inner sides of the steel columns and the steel beams. Bracing components. The diagonal bracing assembly includes a steel support rod. There are U-shaped connectors between the steel support rod and the steel beam, and between the steel support rod and the steel column. There are a number of screw holes I on both ends of the steel support rod. Both sides of the U-shaped connector Each is equipped with a number of corresponding screw holes II, and the steel support rod and the U-shaped connector are connected and fixed through the threaded screw rod. It has the characteristics of small steel consumption, small construction scope, high structural strength and short construction period. The impact on the original structure is small, and the production lines in the factory often do not need to be shut down during the construction process, which greatly saves reinforcement costs without affecting production. It is guaranteed to work together with the original structure and avoids the problems of additional residual stress and excessive redundancy caused by being directly connected to beams and columns.

Description

BAPV reinforcement system and construction methods for existing buildings

Technical field

The invention relates to the field of construction technology, and specifically to a BAPV reinforcement system and a construction method for an existing building.

Background technique

New photovoltaic projects in existing buildings are being carried out across the country. Among them, steel structure single-story factory buildings are usually far away from the city, with less shielding, large electricity demand, and large roof area. It is also very convenient to install photovoltaics on metal roofs, making them the best candidates for installing photovoltaics. However, this type of light steel structure factory building has a relatively small load reserve, poor robustness, and is sensitive to load changes; the new photovoltaic load is likely to cause the original structure to exceed the stress limit. Therefore, installing photovoltaics on such structures often requires supporting structural reinforcement.

The method of adding diagonal brace reinforcement comes from the section "Changing the Structural System Reinforcement Method" mentioned in the "Steel Structure Reinforcement Design Standard" GB51367-2019. However, the standard only proposes concepts and does not detail relevant details and specific content during design and construction, nor does it provide specific explanations of its application and effects.

After adding photovoltaics to the metal roof of an existing factory building, the original structure usually exceeds the limit to a certain extent. Among them, steel beams mostly exceed the limit, and the steel beams mostly exceed the limit due to out-of-plane stable stress. Sometimes there are also in-plane stable stress overruns. Or the intensity exceeds the limit.

When dealing with out-of-plane overruns, the traditional method is to add supports outside the plane to reduce its calculated length. When dealing with in-plane overruns and strength overruns, the method of increasing the cross-section can be used. However, adding out-of-plane supports often requires a large amount of steel or requires a large amount of construction work. The enlarged cross-section reinforcement method also has problems such as a large amount of welding work, the risk of sparks, and the softening of original steel components due to heat.

Contents of the invention

The present invention mainly solves the deficiencies in the existing technology and provides a BAPV reinforcement system and construction method for existing buildings, which has the characteristics of small steel consumption, small construction operation scope, high structural strength and short construction period. The impact on the original structure is small, and the production lines in the factory often do not need to be shut down during the construction process, which greatly saves reinforcement costs without affecting production. It is guaranteed to work together with the original structure and avoids the problems of additional residual stress and excessive redundancy caused by being directly connected to beams and columns.

The above technical problems of the present invention are mainly solved through the following technical solutions:

A BAPV reinforcement system for an existing building includes a number of parallel steel beams distributed at equal intervals. Steel columns are provided at both ends of the steel beams, and diagonal brace assemblies are provided between the upper inner sides of the steel columns and the steel beams; The diagonal bracing assembly includes a steel support rod, and U-shaped connectors are inserted and fixedly connected to the steel support rod between the steel support rod and the steel beam, and between the steel support rod and the steel column. A number of screw holes I are provided at both ends of the steel support rod, and a number of corresponding screw holes II are provided on both sides of the U-shaped connector. The steel support rod and the U-shaped connector are penetrated by the threaded screw. Hole I and screw hole II are connected and fixed.

Preferably, both sides of the steel beam and the inside of the upper end of the steel column are provided with connecting flanges that are integrally welded and fixed with the steel column and the steel beam respectively. The connecting flange on the steel beam is connected to the steel beam. The connecting flange on the column is fixed with connecting bolts and nuts.

As an option, the steel support rods are connected between the steel beams and steel columns through U-shaped connectors to achieve hinged connections and assist the original structure in bearing force.

As a preferred option, diagonal bracing components are used to provide support for the steel beams and reduce their stress through auxiliary force, thereby weakening the impact of photovoltaic loads on the original structure.

Preferably, the steel support rod is made of square steel pipe, H-shaped steel or angle steel.

A construction method of BAPV reinforcement system for existing buildings, including the following steps:

The first step: first process the steel columns, steel beams, connecting flanges, U-shaped connectors and steel support rods, and then weld and fix the connecting flanges to the steel columns and steel beams respectively.

Step 2: Pre-assemble the U-shaped connector and steel support rod, and process and drill the screw hole I and screw hole II together.

Step 3: Fix the threaded screw rod through screw hole I and screw hole II to the steel support rod and U-shaped connector, and use nuts to connect and lock the two ends of the threaded screw rod.

Step 4: Lift the diagonal brace assembly as a whole, and weld and fix the U-shaped connectors to the steel columns and steel beams respectively.

As a preferred method, first weld the U-shaped connectors to the steel columns and steel beams, then place the diagonal braces in the corresponding positions and connect them through high-strength cross-penetrating screws.

The present invention can achieve the following effects:

The present invention provides a BAPV reinforcement system and construction method for an existing building. Compared with the existing technology, the system has the characteristics of small steel consumption, small construction operation scope, high structural strength and short construction period. The impact on the original structure is small, and the production lines in the factory often do not need to be shut down during the construction process, which greatly saves reinforcement costs without affecting production. It is guaranteed to work together with the original structure and avoids the problems of additional residual stress and excessive redundancy caused by being directly connected to beams and columns.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic structural diagram of the steel support connection of the present invention.

Figure 3 is a schematic structural diagram of the steel support rod of the present invention.

Figure 4 is a schematic structural diagram of the U-shaped connector of the present invention.

In the picture: steel column 1, steel beam 2, diagonal brace component 3, connecting bolt 4, connecting flange 5, U-shaped connector 6, steel support rod 7, through screw rod 8, screw hole I9, screw hole II10.

Detailed ways

The technical solution of the invention will be further described in detail below through examples and in conjunction with the accompanying drawings.

Embodiment: As shown in Figure 1-4, a BAPV reinforcement system for an existing building includes a number of parallel steel beams 2 distributed at equal intervals. Steel columns 1 are provided at both ends of the steel beams 2. On both sides of the steel beams 2, The inner side of the upper end of the steel column 1 is provided with a connecting flange 5 that is integrated and welded with the steel column 1 and the steel beam 2 respectively. The connecting flange 5 on the steel beam 2 is connected to the connecting flange 5 on the steel column 1. Use connecting bolts 4 and nuts to fix. A diagonal bracing assembly 3 is provided between the upper inner side of the steel column 1 and the steel beam 2. The diagonal bracing assembly 3 is used to provide support for the steel beam 2 and reduce its stress through auxiliary force, thereby weakening the impact of the photovoltaic load on the original structure.

The diagonal bracing component 3 includes a steel support rod 7, which is made of square steel pipe, H-shaped steel or angle steel. Between the steel support rod 7 and the steel beam 2, and between the steel support rod 7 and the steel column 1, there are U-shaped connectors 6 that are inserted and fixedly connected to the steel support rod 7. Both ends of the steel support rod 7 are provided with 4 There are three screw holes I9, and four corresponding screw holes II10 are provided on both sides of the U-shaped connector 6. The steel support rod 7 and the U-shaped connector 6 are connected and fixed by passing through the screw holes 8 through the screw holes I9 and screw holes II10. . The steel support rod 7 is connected between the steel beam 2 and the steel column 1 through the U-shaped connector 6 to achieve a hinged connection and assist the original structure in bearing force.

A BAPV reinforcement system and construction method for existing buildings, including the following steps:

Step 1: First process the steel column 1, steel beam 2, connecting flange 5, U-shaped connector 6 and steel support rod 7, then weld and fix the connecting flange 5 to the steel column 1 and steel beam 2 respectively. .

Step 2: Pre-assemble the U-shaped connector 6 and the steel support rod 7, and process and drill the screw hole I9 and screw hole II10 together.

Step 3: Fix the countersunk screw rod 8 through screw hole I9 and screw hole II10 to the steel support rod 7 and U-shaped connector 6, and use nuts to connect and lock the two ends of the countersunk screw rod 8.

Step 4: Lift the diagonal brace assembly 3 as a whole, and weld and fix the U-shaped connector 6 to the steel column 1 and steel beam 2 respectively.

During the assembly process of the diagonal bracing assembly 3, the U-shaped connector 6 can be welded to the steel column 1 and the steel beam 2 first, and then the diagonal bracing is placed in the corresponding position and connected through the high-strength butt screw 8.

To sum up, the BAPV reinforcement system and construction method of the existing building have the characteristics of small steel consumption, small construction scope, high structural strength and short construction period. The impact on the original structure is small, and the production lines in the factory often do not need to be shut down during the construction process, which greatly saves reinforcement costs without affecting production. It is guaranteed to work together with the original structure and avoids the problems of additional residual stress and excessive redundancy caused by being directly connected to beams and columns.

The above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the field of the present invention are covered by the patent scope of the present invention. among.

Claims (7)

1. An existing building BAPV reinforcement system, characterized by: the steel columns (1) are arranged at two ends of each steel beam (2), and diagonal bracing assemblies (3) are arranged between the inner sides of the upper parts of the steel columns (1) and the steel beams (2); the diagonal bracing assembly (3) include steel bracing piece (7), steel bracing piece (7) and girder steel (2) between, steel bracing piece (7) and steel column (1) between all be equipped with steel bracing piece (7) looks inserted embedded fixed connection's U type connecting piece (6), steel bracing piece (7) both ends all be equipped with a plurality of screw rod hole I (9), U type connecting piece (6) both sides all be equipped with a plurality of corresponding screw rod hole II (10), steel bracing piece (7) and U type connecting piece (6) carry out the connection fixedly through penetrating screw rod (8) through screw rod hole I (9), screw rod hole II (10).

2. The existing building BAPV reinforcement system of claim 1, wherein: the steel beam (2) both sides limit, steel column (1) upper end inboard all be equipped with respectively with steel column (1), girder steel (2) integration welded fastening's flange (5), girder steel (2) on flange (5) and steel column (1) on flange (5) adopt connecting bolt (4) and nut to fix.

3. The existing building BAPV reinforcement system of claim 1, wherein: the steel support rods (7) are connected between the steel beams (2) and the steel columns (1) through the U-shaped connecting pieces (6), so that hinged connection is realized, and the stress of the original structure is assisted.

4. The existing building BAPV reinforcement system of claim 1, wherein: the inclined strut assembly (3) is adopted to provide support for the steel beam (2), and stress of the steel beam is reduced through auxiliary stress, so that the influence of photovoltaic load on an original structure is reduced.

5. The existing building BAPV reinforcement system of claim 1, wherein: the steel support rod (7) is square steel pipe, H-shaped steel or angle steel.

6. The method of constructing an existing building BAPV reinforcement system according to claim 2, comprising the steps of:

the first step: firstly, processing a steel column (1), a steel beam (2), a connecting flange plate (5), a U-shaped connecting piece (6) and a steel supporting rod (7), and then respectively welding and fixing the connecting flange plate (5) with the steel column (1) and the steel beam (2);

and a second step of: pre-assembling the U-shaped connecting piece (6) and the steel supporting rod (7), and processing and punching the screw hole I (9) and the screw hole II (10) together;

and a third step of: the opposite penetrating screw rod (8) penetrates through the screw rod hole I (9) and the screw rod hole II (10) to fix the steel support rod (7) and the U-shaped connecting piece (6), and the two ends of the opposite penetrating screw rod (8) are sleeved, locked and limited by nuts;

fourth step: and the whole lifting diagonal bracing assembly (3) is used for respectively welding and fixing the U-shaped connecting piece (6) with the steel column (1) and the steel beam (2).

7. The method of constructing an existing building BAPV reinforcement system according to claim 6, wherein: firstly, a U-shaped connecting piece (6) is welded on a steel column (1) and a steel beam (2), and when the diagonal bracing is placed at a corresponding position, the U-shaped connecting piece is connected through a high-strength opposite penetrating screw rod (8).