CN116752789A - A method for retrofitting and strengthening roof suspension beams by pulling out columns - Google Patents

Abstract

The invention provides a roof suspension beam pulling column reinforcement and transformation method, which belongs to the field of construction technology and aims to solve secondary problems such as the existing joist column pulling technology affecting the clear height of the building and the need to reinforce surrounding components. The technical key points of the present invention mainly include the following steps: heighten the columns that need to be erected with steel arch frames, obtain column caps that support the steel arch frames, transport the factory-processed steel arch frames to the construction site and place them at the heightened column caps. The arch frame and the roof beam to be reinforced are connected through a Y-shaped hanger, and the roof load is transmitted to the steel arch frame through the Y-shaped hanger. At the same time, prestressed steel cables are added at the two arch feet of the steel arch to balance the horizontal thrust generated at the arch feet after the steel arch receives the roof load from the hanger. Steel arches, Y-shaped hangers and prestressed steel cables form an independent stress-bearing system with excellent stress-bearing performance and clear force transmission paths to ensure the deflection, cracks and bearing capacity requirements of roof beams that lack support due to the removal of columns, and creatively provide A new reinforcement and transformation method was developed.

Description

A method for retrofitting and strengthening roof suspension beams by pulling out columns

Technical field

The invention belongs to the field of construction technology and relates to a roof suspension beam pulling out column reconstruction and reinforcement method.

Background technique

Joist column pulling is a general term for roof truss column pulling, joist wall removal, and joist column removal. It is a comprehensive technology that removes, replaces, and extends columns without dismantling or dismantling the superstructure, including Relevant structural reinforcement technology, superstructure jacking technology and column breaking technology, etc. Compared with the traditional large-scale cover renovation, the joist and column pulling method has the advantages of less impact on production and life, shorter renovation time, and lower cost.

The existing construction of pulling out joists and columns mainly involves adding supports or adding prestressed steel bars at the bottom of the beams. This method not only reduces the height of the house, but also requires a large range of structural reinforcement, which greatly disturbs the original structure of the building, especially The impact on the pillars is more obvious.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and provide a method for reinforcing and transforming roof beams by pulling out columns with little disturbance to the original structure of the building, a clear force transmission path, and simple and quick construction.

The object of the present invention can be achieved through the following technical solutions:

A method for reinforcing and transforming roof suspension beams by pulling out columns. It is intended to dismantle the corresponding columns and add supports to the roof beams whose spans have increased due to the removal of the columns. It is characterized in that: the reinforcement method includes the following steps:

A. Preparation of steel arch frame: prepare the upper chord bar, lower chord bar, web bar and steel cable. The above-mentioned upper chord bar and lower chord bar are both arc-shaped and arranged up and down. The number of the above-mentioned web bar is several, and several web bars are arranged along the upper chord. The length direction of the rods is evenly connected between the upper chord rods and the lower chord rods, resulting in a steel arch with both ends facing downwards and an arc shape. Finally, the steel cables are connected between the two ends of the steel arch;

The number of upper chord rods and lower chord rods is two. There are also web rods between the upper chord rods and the upper chord rods, and there are also web rods between the lower chord rods and the lower chord rods;

B. Treatment of the upper end of the column: The upper end of the column is chiseled and concrete is poured to obtain a protruding and heightened column cap;

C. Connection operation one: One end of the steel arch frame is connected to the heightened column cap of one of the columns, and the other end of the steel arch frame is connected to the heightened column cap of the other column;

D. Connection operation 2: Prepare a Y-shaped boom, secure the upper end of the boom to the steel arch, and secure the lower end of the boom to the roof beam;

E. After the above steps BCD, a reinforced single-frame arch frame is obtained on the upper part of the corresponding roof beam. After the reinforced single-frame arch frame of the two adjacent roof beams is formed, a horizontal connecting rod is used to connect the two adjacent reinforced single-frame arch frames.

This roof suspension beam column reinforcement and transformation method creatively prepares steel arch frames in advance, and the upper ends of the columns are processed to form elevated column caps with sufficient connection positions and protrusions.

After the first connection operation, the steel arch can be stably connected to the heightened column cap of one of the columns. After the second connection operation, the hanger can be stably connected between the steel arch and the roof beam.

After the above reinforcement construction operations, the roof load can be transferred to the steel arch. At the same time, high-strength prestressed steel cables are connected to both ends of the steel arch, so the horizontal forces at the ends of the steel arch can be balanced by the steel cables.

That is to say, the steel arch forms a separate force-bearing system, which transmits the load to the steel arch support columns in the form of vertical axial force to avoid damage due to excessive bending moments of the beam-column nodes after the columns are pulled out, and maximize the Preserve the original structure.

After the upper ends of the corresponding columns are processed through the BCD step, a single steel arch is stably connected to the corresponding column to obtain a single reinforced single arch.

In step E, the two adjacent reinforced single arch frames are stably connected through horizontal connecting rods, and finally the reinforcement of the entire roof suspension beam and column is completed. Of course, after reinforcement, the column to be removed can be cut off according to the set length.

In the above-mentioned method of pulling out column reinforcements for roof suspension beams, in step A, the upper chord, lower chord, web rod and steel cable are connected into an integral structure and then transported to the construction site.

Steel arch frames are transported to the construction site as prefabricated parts for installation, which can reduce construction time and improve work efficiency.

In the above-mentioned method for reinforcing and transforming roof beams by pulling out columns, in step A, the steel arch frame is prepared into several sections of semi-finished products, and the semi-finished products are transported to the construction site for splicing.

The steel arch frame is prepared in sections, which facilitates transportation. It can also be adapted to restricted installation and construction situations, effectively improving applicability.

In the above-mentioned method of pulling out and reinforcing columns of roof suspension beams, in step B, after the roughening treatment, anchoring steel bars are implanted at the upper ends of the columns, anchor pads are connected to the steel bars, and then concrete is poured to cover the above-mentioned anchor steel bars and anchor pads. , after the concrete solidifies, a protruding and elevated column cap is obtained.

The protruding and elevated column caps provide sufficient space for the steel arch ends to be stably connected and installed.

In the above-mentioned method for reinforcing and transforming roof beams by pulling out columns, the strength level of the concrete poured in step B is higher than the concrete strength level of the columns.

Such a structure can effectively improve the strength of the elevated column cap.

In the above-mentioned method for reinforcing and transforming roof beams by pulling out columns, the connection operation temporarily suspends the steel arch to the installation position, and then ensures the stability of the steel arch through temporary support.

Temporary support can ensure that the steel arch can be stably installed at the elevated column cap.

In the above-mentioned method of pulling out and strengthening columns of roof suspension beams, the end of the steel arch frame is connected to the heightening column cap through bolts.

In the above-mentioned method of pulling out and strengthening columns of roof suspension beams, the end of the steel arch frame and the heightening column cap are connected by welding.

Whether through bolts or welding, the end of the steel arch can be stably connected to the elevated column cap.

In the above-mentioned method of pulling out and reinforcing columns of roof suspension beams, the suspension rods and roof beams are connected through chemical anchor bolts.

Chemical anchor bolt is a new type of fastening material. It is a composite component that uses a special chemical adhesive to cement and fix the screw rod in the drilled hole of the concrete base material to achieve anchoring of the fastener.

Products are widely used in fixed curtain wall structures, installation machines, steel structures, railings, windows, etc. It is quick to install and solidifies without delaying the construction progress.

In the above-mentioned method of pulling out column reinforcements of roof suspension beams, the suspension rod and the lower chord of the steel arch are connected by welding.

The Y-shaped ends of the boom are welded and fixed on both sides of the steel arch. This structure can make the upper end of the boom stably connected to the steel arch.

In the above-mentioned roof suspension beam pulling out column reinforcement and transformation method, in the step D, a column-holding beam is set on the column to be removed, and the distance between the column-holding beam and the roof deck surface is 1.2-1.7 meters. This is the fulcrum to set up temporary jack support at the beam end at the junction of the column to be removed and the roof beam, and then cut off the beam-column connection at the bottom elevation of the beam to facilitate the construction of the lower hoop plate.

The setting of the column-holding beam provides enough space for the installation of the jack, and the lower hoop plate can be easily installed and connected under the action of the jack.

In the above-mentioned roof beam lifting column reinforcement and transformation method, in step D, the upper hoop plate is fixed to the chemical anchor bolt, the lower hoop plate is arranged at the lower part of the upper hoop plate, and the upper hoop plate and the lower hoop plate pass through several pairs of After the lower end of the boom is connected with the upper hoop plate, concrete is poured into the connection. After the concrete is solidified, the concrete pier formed will be covered with chemical anchor bolts, pull bolts, upper hoop plate and lower hoop plate.

The upper hoop plate and the lower hoop plate are stably connected under the action of the tension bolts. After the concrete is poured, all the above parts are covered, improving the compactness of the structure.

In the above-mentioned method for pulling out column reinforcements of roof suspension beams, the number of the tension bolts is several, and the plurality of tension bolts are connected in a grid shape between the upper hoop plate and the lower hoop plate.

Multiple pull bolts can effectively improve the connection stability between the upper hoop plate and the lower hoop plate.

In the above-mentioned method of pulling out and reinforcing columns of roof suspension beams, the jack is dismantled after step E.

Compared with the existing technology, this roof suspension beam column reinforcement and transformation method maintains a stable connection between the lower end of the suspension rod and the roof beam because the pull bolts cooperate with the chemical anchor bolts, the upper hoop plate and the lower hoop plate, and the upper end of the suspension rod is fixedly connected to the steel On the arch beam, the horizontal force generated by the steel arch frame is balanced by steel cables. This structure has the following advantages:

1. There is little disturbance to the original building structure, and the construction is safe and reliable;

2. Beautiful appearance, economical and environmentally friendly;

3. Excellent stress performance;

4. Small impact on the environment and fast construction speed;

5. The steel arch frame, Y-shaped boom and high-strength prestressed steel cables form a separate stress system;

6. Excellent force-bearing performance and clear force transmission path, providing sufficient basis for design.

Description of the drawings

Figure 1 is a schematic three-dimensional structural diagram of the original structural roof beam.

Figure 2 is an overall three-dimensional schematic diagram of the lifting beam and column reinforcement.

Figure 3 is a three-dimensional schematic diagram of pulling out the suspension beam and strengthening the single-frame arch frame.

Figure 4 shows the connection node between the Y-shaped boom and the roof beam.

Figure 5 is a cross-sectional view of node 1-1 connecting the Y-shaped boom and the roof beam.

Figure 6 is a cross-sectional view of node 2-2 connecting the Y-shaped boom and the roof beam.

Figure 7 shows the connection node between the Y-shaped boom and the steel arch.

Figure 8 is the connection node between the steel arch frame and the column end.

Figure 9 is a plan view of the pillar-supported beam.

Figure 10 is a cross-sectional view of the plan view 1-1 of the column-holding beam.

Figure 11 is the plan layout of the column-supported beam steel support.

In the figure, 1. Roof beam; 2. Connection node between hanger and roof beam; 201. Concrete; 202. Upper hoop plate; 203. Chemical anchor bolt; 204. Tension bolt; 205. Lower hoop plate; 206. Steel bar; 3. Steel cable; 4. Upper chord; 5. Bottom chord; 6. Connection node between steel arch and column; 601. Anchor pad; 602. Anchor steel bar; 603. Heightened column cap; 7. Suspender rod; 8. Abdominal rod.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

It should be noted that when a component is referred to as being "mounted on" another component, it can be mounted directly on the other component or intervening components may also be present. When a component is said to be "set on" another component, it can be directly set on the other component or there may be a centered component at the same time. When a component is said to be "anchored" to another component, it can be directly anchored to the other component or there may be an intermediate component present as well.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the invention belongs. The terminology used herein in the description of the invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in Figures 1 and 2, it is planned to dismantle the corresponding columns, and add supports to the roof beams whose spans will increase due to the removal of the columns.

As shown in Figure 3 and Figure 4 and Figure 5 and Figure 6 and Figure 7 and Figure 8 and Figure 9 and Figure 10 and Figure 11, this method of reinforcing and transforming roof beams by pulling out columns includes the following steps:

A. Preparation of the steel arch frame: prepare the upper chord 4, the lower chord 5, the web rod 8 and the steel cable 3. The above upper chord 4 and the lower chord 5 are both arc-shaped and are arranged up and down. The number of the above web rods 8 is several root, a number of web rods 8 are evenly connected between the upper chord 4 and the lower chord 5 along the length direction of the upper chord 4, to obtain a steel arch with both ends facing downwards and an arc shape, and finally the steel cable 3 is connected to the steel arch between the two ends of the rack;

The number of upper chord rods and lower chord rods is two. There are also web rods between the upper chord rods and the upper chord rods, and there are also web rods between the lower chord rods and the lower chord rods;

In step A, the upper chord 4, the lower chord 5, the web rod 8 and the steel cable 3 are connected into an integral structure and then transported to the construction site. Of course, depending on the actual situation, it is also feasible to prepare the steel arch frame into several semi-finished products in step A, and transport the semi-finished products to the construction site for splicing.

B. Treatment of the upper end of the column: The upper end of the column is chiseled and concrete is poured to obtain a protruding and heightened column cap;

In the step B, after the roughening treatment, the anchoring steel bar 602 is implanted at the upper end of the column, and the steel bar 206 is connected to the anchor pad 601. Then concrete is poured to cover the anchoring steel bar 602 and the anchor pad 601. After the concrete solidifies, a protrusion is obtained. of elevated column caps.

In this embodiment, the strength level of the concrete poured at the heightened column cap is higher than the concrete strength level of the column.

The heightened column cap is connected to the end of the steel arch frame to form a connection node 6 between the steel arch frame and the column.

C. Connection operation one: One end of the steel arch frame is connected to the heightened column cap of one of the columns, and the other end of the steel arch frame is connected to the heightened column cap of the other column;

The connection operation involves temporarily hoisting the steel arch to the installation position, and then ensuring the stability of the steel arch through temporary support.

The end of the steel arch frame is connected to the elevated column cap through bolts. Depending on the actual situation, it is also feasible for the end of the steel arch frame and the elevated column cap to be connected by welding.

D. Connection operation 2: Prepare the Y-shaped boom 7, fasten the upper end of the boom to the steel arch, and fasten the lower end of the boom 7 to roof beam 1;

The suspender 7 is connected to the roof beam 1 through chemical anchor bolts.

The suspension rod 7 and the lower chord 5 of the steel arch are fixedly connected by welding.

In step D, a column-holding beam is set on the column to be removed. The distance between the column-holding beam and the roof deck is 1.2-1.7 meters. This is the fulcrum at the junction of the column to be removed and the roof beam. Set up temporary jack support at the end, and then cut off the beam-column connection at the bottom elevation of the beam to facilitate the construction of the lower hoop plate.

In step D, the upper hoop plate 202 is fixed to the chemical anchor bolt 203, the lower hoop plate 205 is arranged at the lower part of the upper hoop plate 202, and the upper hoop plate 202 and the lower hoop plate 205 are connected through a number of pull bolts 204, and the suspension rod 7. After the lower end is firmly connected to the upper hoop plate 202, concrete 201 is poured into the above-mentioned connection. The concrete pier formed after the concrete 201 is solidified will cover the chemical anchor bolts 203, the tension bolts 204, the upper hoop plate 202 and the lower hoop plate 205.

The concrete pier covers the chemical anchor bolts 203, tension bolts 204, upper hoop plate 202 and lower hoop plate 205 to form a connection node 2 between the suspender and the roof beam.

The number of the tension bolts 204 is several, and the plurality of tension bolts 204 are connected in a grid shape between the upper hoop plate 202 and the lower hoop plate 205 .

E. After the above steps BCD, a reinforced single-frame arch is obtained on the upper part of the corresponding roof beam 1. After the reinforced single-frame arches of the two adjacent roof beams 1 are formed, horizontal connecting rods are used to connect the two adjacent reinforced single-frame arches.

Remove the jack after step E.

This roof suspension beam column reinforcement and transformation method creatively prepares steel arch frames in advance, and the upper ends of the columns are processed to form elevated column caps with sufficient connection positions and protrusions.

After the first connection operation, the steel arch can be stably connected to the heightened column cap of one of the columns. After the second connection operation, the hanger can be stably connected between the steel arch and the roof beam.

After the above reinforcement construction operations, the roof load can be transferred to the steel arch. At the same time, high-strength prestressed steel cables are connected to both ends of the steel arch, so the horizontal forces at the ends of the steel arch can be balanced by the steel cables.

That is to say, the steel arch forms a separate force-bearing system, which transmits the load to the steel arch support columns in the form of vertical axial force to avoid damage due to excessive bending moments of the beam-column nodes after the columns are pulled out, and maximize the Preserve the original structure.

After the upper ends of the corresponding columns are processed through the BCD step, a single steel arch is stably connected to the corresponding column to obtain a single reinforced single arch.

In step E, the two adjacent reinforced single arch frames are stably connected through horizontal connecting rods, and finally the reinforcement of the entire roof beam, suspension beam and column is completed. Of course, after reinforcement, the column to be removed can be cut off according to the set length.

Since the steel cables are connected between the two ends of the steel arch, the horizontal tension at the ends of the steel arch is balanced by high-strength prestressed steel cables to ensure that the steel arch is stably connected to the elevated column cap.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, All should be considered to be within the scope of this manual.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention and are not used to limit the invention. As long as they are within the scope of the essential spirit of the present invention, appropriate changes can be made to the above embodiments. and changes all fall within the scope of protection claimed by the present invention.

Claims (10)

1. A method for reinforcing and transforming roof suspension beams by moving columns. It is intended to dismantle the corresponding columns and add supports to the roof beams whose spans have increased due to the removal of the columns. The characteristic is that: the reinforcement method includes the following steps: A. Preparation of steel arch frame: prepare the upper chord bar, lower chord bar, web bar and steel cable. The above-mentioned upper chord bar and lower chord bar are both arc-shaped and arranged up and down. The number of the above-mentioned web bar is several, and several web bars are arranged along the upper chord. The length direction of the rods is evenly connected between the upper chord rods and the lower chord rods, resulting in a steel arch with both ends facing downwards and an arc shape. Finally, the steel cables are connected between the two ends of the steel arch; The number of upper chord rods and lower chord rods is two. There are also web rods between the upper chord rods and the upper chord rods, and there are also web rods between the lower chord rods and the lower chord rods; B. Treatment of the upper end of the column: The upper end of the column is chiseled and concrete is poured to obtain a protruding and heightened column cap; C. Connection operation one: One end of the steel arch frame is connected to the heightened column cap of one of the columns, and the other end of the steel arch frame is connected to the heightened column cap of the other column; D. Connection operation 2: Prepare a Y-shaped boom, secure the upper end of the boom to the steel arch, and secure the lower end of the boom to the roof beam; E. After the above steps BCD, a reinforced single-frame arch frame is obtained on the upper part of the corresponding roof beam. After the reinforced single-frame arch frame of the two adjacent roof beams is formed, a horizontal connecting rod is used to connect the two adjacent reinforced single-frame arch frames. 2. The method for reinforcing and transforming roof suspension beam poles according to claim 1, characterized in that in step A, the upper chord, lower chord, web rod and steel cable are connected into an integral structure and then transported to the construction site. 3. The roof suspension beam and column reinforcement and transformation method according to claim 1, characterized in that in step A, the steel arch frame is prepared into several sections of semi-finished products, and the semi-finished products are transported to the construction site for splicing. 4. The roof suspension beam column reinforcement and transformation method according to claim 2, characterized in that in step B, after the roughening treatment, anchoring steel bars are implanted at the upper ends of the columns, the anchor pads are connected to the steel bars, and then concrete is poured to The above-mentioned anchor steel bars and anchor pads are covered, and after the concrete is solidified, a protruding and heightened column cap is obtained. 5. The roof suspension beam column reinforcement and reconstruction method according to claim 4, characterized in that the end of the steel arch frame and the heightening column cap are connected by bolts. 6. The roof suspension beam column reinforcement and reconstruction method according to claim 4, characterized in that the end of the steel arch frame and the heightening column cap are connected by welding. 7. The method for reinforcing and transforming roof suspension beams by driving columns according to claim 5, characterized in that the suspension rods and roof beams are connected through chemical anchor bolts. 8. The method for reinforcing and transforming roof suspension beam poles according to claim 7, characterized in that the suspension rod and the lower chord of the steel arch are fixedly connected by welding. 9. The roof suspension beam column reinforcement and reconstruction method according to claim 8, characterized in that in step D, a column-holding beam is set on the column to be removed, between the column-holding beam and the roof layer plate surface The distance is 1.2-1.7 meters. This is the fulcrum to set up a temporary jack support at the end of the beam at the junction of the column to be removed and the roof beam, and then cut off the beam-column connection at the bottom elevation of the beam to facilitate the construction of the lower hoop plate. 10. The roof suspension beam column reinforcement and reconstruction method according to claim 9, characterized in that in step D, the upper hoop plate is fixedly connected to the chemical anchor bolt, and the lower hoop plate is arranged on the lower part of the upper hoop plate and on the upper hoop plate. The hoop plate and the lower hoop plate are connected through a number of tensile bolts. After the lower end of the boom is fixed to the upper hoop plate, concrete is poured at the above-mentioned connection. After the concrete is solidified, the concrete pier formed contains chemical anchor bolts, tensile bolts, and the upper hoop plate. And cover the lower hoop plate, remove the jack after step E.