A supporting device for supporting beams and columns and a supporting method thereof

Abstract

The present invention relates to a supporting device for supporting beams and columns and a supporting method thereof, wherein the supporting device comprises a double web H-shaped steel, a horizontal supporting H-shaped steel and a jack which are arranged in sequence from top to bottom. The present invention is simple in construction, reliable in quality, safe and controllable, and cost-saving.

Description

Technical Field

[0001] The invention relates to the field of construction of beam-supporting and column-pulling operations of existing buildings, in particular to a beam-supporting and column-pulling support device and a support method thereof. Background Art

[0002] As the use function of existing buildings changes or factors such as unreasonable space design lead to the actual functional needs of the buildings can no longer meet the existing needs, and when the existing buildings need to remove the middle span structural columns due to internal space renovation, that is, when the supporting beams and columns are removed, there is a common problem of how to install the steel bars with increased cross-section beams, and no better solution has been found so far. Summary of the invention

[0003] In order to solve the above technical problems existing in the background technology, the present invention provides a beam-and-column replacement device and a replacement method thereof which are simple in construction, reliable in quality, safe and controllable, and cost-saving.

[0004] The technical solution of the present invention is: the present invention is a supporting device for supporting beams and pulling out columns, and its special feature is that the device comprises a double web H-shaped steel, a horizontal supporting H-shaped steel and a jack which are arranged in sequence from top to bottom.

[0005] Preferably, pads are provided on both sides of the double-web H-shaped steel.

[0006] Preferably, a steel pad is provided under the jack.

[0007] Preferably, an anti-fall support H-shaped steel is provided on the side of the jack.

[0008] Preferably, a stiffening plate is provided inside the horizontal supporting H-shaped steel.

[0009] Preferably, the jack is a hydraulic jack.

[0010] Preferably, there are two jacks connected in parallel, with an oil pump providing lifting power, and the two jacks are respectively provided with hydraulic oil nozzle switches.

[0011] A method for implementing the above-mentioned underpinning device for supporting beams and columns is characterized in that the method comprises the following steps:

[0012] 1) Construction simulation: Before construction, the finite element calculation software YJK1.8.3.0 was used to analyze and simulate the stress of the support scheme. The three stress conditions in the column extraction support were simulated: the stress condition when the rectangular hole was statically cut in the original concrete column and supported by the remaining part of the concrete column; the stress condition when the remaining part of the concrete column was cut after the jack was lifted; the stress analysis of the jack-supported steel;

[0013] 2) Clear the upper load; clear the load on the plate within the span above the column extraction position, remove the floor slab around the column extraction position according to the drawing requirements, and chisel the concrete surface of the reinforced beams and columns;

[0014] 3) Laying out the holes for the columns to be removed; before construction, pop out the positioning lines for the holes for the columns to be removed, and use a rope saw to open the holes for the columns to be removed;

[0015] 4) Install the replacement device for supporting beams and columns;

[0016] 4.1) According to the calculation of the Explorer software and the design drawing parameters, the double web H-shaped steel, horizontal support H-shaped steel, anti-fall support H-shaped steel, steel pad and pad models are calculated, and the steel material is Q345B;

[0017] 4.2) Lay a steel pad under the opening of the column to be removed to ensure that the supporting jack remains stable and the concrete on the lower contact surface is evenly stressed;

[0018] 4.3) Use the chain hoisting jack to the center hole of the column and place it steadily, and install the anti-fall support H-shaped steel, horizontal support H-shaped steel, double web H-shaped steel and pads in sequence;

[0019] 5) Lifting with jack;

[0020] 6) Increase the cross section of the prestressed beam; tie the steel bars of the support beam, tie the steel bars of the beam with increased cross section, install the prestressed corrugated pipe, prestressed tendons and nodes; then support the formwork and pour the CGM grouting material; after the grouting material reaches the strength, tension the prestressed tendons;

[0021] 8) Remove the supports and columns to be removed; after reinforcement is completed, unload in stages, with the number of stages not less than five, and control the unloading value of each stage through displacement deformation monitoring; the first stage unloading value is 40KN, and the remaining stages are 50KN each. At the same time, observe the displacement changes of related components and nodes to provide a basis for judgment for subsequent unloading control; when the CGM grouting of the enlarged section reaches 100% strength and the prestressing is completed, remove the jack support, use a rope saw to cut and remove the concrete columns of this layer, and the support beam and column pulling are completed.

[0022] Preferably, the specific steps of step 5) are as follows:

[0023] 5.1) Determine the specifications of the jack based on construction simulation calculations;

[0024] 5.2) Use the original structural columns as supports and test the jacks first. After the test, start jacking slowly at first to observe whether there are any abnormalities in the structural systems. The jacking process is carried out in stages. There should be a certain pause between each stage of loading to allow the structure to deform fully. Track and monitor on site, read the support top displacement and support top reaction force, and compare and verify with the computer simulation. When the jacking reaction force reaches the construction simulation calculation value, stop jacking. At the same time, after confirming that the steel bars have reached the zero stress state based on the real-time monitoring data, use a hydraulic rope saw to synchronously cut the remaining concrete on both sides. The cutting process is tracked and monitored and settled in real time until it is completely separated from the original structure after cutting is completed.

[0025] Preferably, step 7) prestressing and construction monitoring is also included between step 6) and step 8);

[0026] 7.1) When the strength of the CGM grouting material of the prestressed beam reaches 100%, the prestressed steel strands are tensioned; through real-time analysis of the monitoring structure, the entire column pulling process can be well controlled, potential dangers can be predicted and discovered in a timely manner, and corresponding protective measures can be formulated accordingly to ensure structural safety during the entire column pulling process;

[0027] 7.2) Two displacement meters are symmetrically arranged at the column head position of the pull column to monitor the displacement changes of the pull column during the lifting and unloading process, so as to control the displacement of the lifting height of the pull column and guide the construction;

[0028] 7.3) Finite element analysis is performed on the parts where the support beams are removed. According to the finite element analysis, during the removal of the frame columns, the axial force of the columns of the intersecting frame beams (taking the cross beams as an example) changes during the cutting process, so the supporting force value is adjusted. It is necessary to set vertical strain monitoring points on the frame columns.

[0029] The present invention sets two jacks, the jacks support the supporting steel (double web H-shaped steel and horizontal support H-shaped steel), the supporting steel supports the pads, the pads support the supporting beams, and the remaining concrete on both sides of the columns to be removed is cut off so that the present invention replaces the columns to be removed to bear the force, replaces the columns to be removed to transmit the vertical load downward, and can increase the cross-section of the beam steel bars and prestressed steel bars to pass smoothly. At the same time, using the replacement device of the present invention, the present invention also provides a construction process that does not remove the upper structure, changes the internal space by supporting the beams and pulling the columns, adopts the measure of the replacement device supported by the jack by pulling the core inside the structural column, replaces the original demolition and reconstruction or steel support system, and takes targeted measures such as transforming the use function of the building, transforming the internal space, and connecting the new and old buildings to meet the existing needs. Therefore, the present invention has the advantages of simple construction, reliable quality, controllable safety and cost saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 for Figure 1 Side view of

[0032] Figure 3 A plan view of the hole for the column to be removed;

[0033] Figure 4 The schematic diagram of the section of the hole for the column to be removed is shown;

[0034] Figure 5 This is a schematic diagram of the installation of the support device for supporting beams and columns;

[0035] Figure 6 Sectional view of installation of the underpinning device for joist and column extraction;

[0036] Figure 7 This is a schematic diagram of cutting the remaining concrete on both sides;

[0037] Figure 8 For the support system, the steel bar elevation drawing is penetrated;

[0038] Fig. 9 The steel bar profile is penetrated for the support system;

[0039] Fig.10 This is a schematic diagram of the column to be removed;

[0040] The reference numerals are as follows:

[0041] 1. Pad; 2. Horizontal support H-shaped steel; 3. Jack; 4. Anti-fall support H-shaped steel; 5. Stiffener; 6. Hydraulic oil nozzle switch; 7. Steel pad; 8. Double web H-shaped steel; 9. Rope saw hole opening position; 10. Rectangular hole; 11. Column to be demolished; 12. Deformation monitoring point; 13. Remaining concrete; 14. Increased cross-section beam reinforcement; 15. Prestressed beam. DETAILED DESCRIPTION

[0042] See also Figure 1 , 2 The structure of the specific embodiment of the present invention includes a double-web H-shaped steel 8, a horizontal support H-shaped steel 2 and a jack 3, which are arranged in sequence from top to bottom. Pads 1 are respectively arranged on both sides of the double-web H-shaped steel 8. A steel pad 7 is arranged under the jack 3, and the steel pad 7 ensures that the support jack 3 remains stable and the concrete on the lower contact surface is evenly stressed; an anti-fall support H-shaped steel 4 is arranged on the side of the jack 3 to prevent the beam from falling when the jack 3 loses pressure. A stiffening plate 5 is also arranged in the horizontal support H-shaped steel 2 to further strengthen the support of the horizontal support H-shaped steel 2. The jack 3 is a hydraulic jack. There are two jacks 3, which are connected in parallel. The lifting power is provided by an oil pump, and the two jacks 3 are respectively provided with a hydraulic oil nozzle switch 6.

[0043] The workflow of removing the column to be removed by using the present invention is as follows:

[0044] See also Figure 3 First, determine the rope saw hole position for the column to be removed 9, see Figure 4 , use a rope saw to cut and open a rectangular hole 10 at the center of the column to be removed, see Figure 5 , 6 , steel pads 7, jacks 3, anti-fall support H-shaped steel 4, horizontal support H-shaped steel 2, double web H-shaped steel 8 and pads 1 are added in sequence inside the rectangular hole 10; the remaining concrete on both sides is supported by jacks 3 to transfer the remaining concrete vertical load to the jack support system, and the construction process can be tracked and monitored through the deformation monitoring point 12. Figure 7 After the vertical load is fully borne by the jack support system, the remaining concrete 13 on both sides of the column is cut off. Figure 8 , 9 10. The original structural beam is enlarged and prestressed. After the installation of the enlarged cross-section beam reinforcement 14, the prestressed beam 15 and the prestressing construction are completed, the jack 3 is gradually unloaded. After the prestressed beam 15 fully bears the vertical load, the jack support and the remaining structural columns are removed. Finally, the beam support and column removal construction is completed.

[0045] The specific construction method of the present invention is as follows:

[0046] 1) Construction simulation: Before construction, the finite element calculation software YJK 1.8.3.0 was used to analyze and simulate the stress of the support scheme. The three stress conditions in the column extraction support were simulated: the stress condition when the rectangular hole was statically cut in the original concrete column and supported by the remaining part of the concrete column; the stress condition when the remaining part of the concrete column was cut after the jack was lifted; the stress analysis of the supporting steel (double web H-shaped steel and horizontal support H-shaped steel) supported by the jack;

[0047] 2) Clear the upper load; clear the load on the plate within the span above the column extraction position, remove the floor slab around the column extraction position according to the drawing requirements, and chisel the concrete surface of the reinforced beams and columns;

[0048] 3) Laying out the holes for the columns to be removed; before construction, pop out the positioning lines for the holes for the columns to be removed, and use a rope saw to open the holes for the columns to be removed;

[0049] 4) Install the replacement device for supporting beams and columns;

[0050] 4.1) According to the calculation of the Explorer software and the design drawing parameters, the double web H-shaped steel, horizontal support H-shaped steel, anti-fall support H-shaped steel, steel pad and pad models are calculated, and the steel material is Q345B;

[0051] 4.2) Lay a steel pad under the opening of the column to be removed to ensure that the supporting jack remains stable and the concrete on the lower contact surface is evenly stressed;

[0052] 4.3) Use the chain hoisting jack to the center hole of the column and place it steadily, and install the anti-fall support H-shaped steel, horizontal support H-shaped steel, double web H-shaped steel and pads in sequence;

[0053] 5) Lifting with jack;

[0054] 5.1) Determine the specifications of the jack based on construction simulation calculations;

[0055] 5.2) Use the original structural columns as supports and test the jacks first. After the test, start jacking slowly at first to observe whether there are any abnormalities in the structural systems. The jacking process is carried out in stages. There should be a certain pause between each stage of loading to allow the structure to deform fully. Track and monitor on site, read the support top displacement and support top reaction force, and compare and verify with the computer simulation. When the jacking reaction force reaches the construction simulation calculation value, stop jacking. At the same time, after confirming that the steel bars have reached the zero stress state based on the real-time monitoring data, use a hydraulic rope saw to synchronously cut the remaining concrete on both sides. The cutting process is tracked and monitored and settled in real time until it is completely separated from the original structure after cutting is completed.

[0056] 6) Increase the cross section of the prestressed beam; tie the steel bars of the support beam, tie the steel bars of the beam with increased cross section, install the prestressed corrugated pipe, prestressed tendons and nodes; then support the formwork and pour the CGM grouting material; after the grouting material reaches the strength, tension the prestressed tendons;

[0057] Step 7) Prestressing and construction monitoring;

[0058] 7.1) When the strength of the CGM grouting material of the prestressed beam reaches 100%, the prestressed steel strands are tensioned; through real-time analysis of the monitoring structure, the entire column pulling process can be well controlled, potential dangers can be predicted and discovered in a timely manner, and corresponding protective measures can be formulated accordingly to ensure structural safety during the entire column pulling process;

[0059] 7.2) Two displacement meters are symmetrically arranged at the column head position of the pull column to monitor the displacement changes of the pull column during the lifting and unloading process, so as to control the displacement of the lifting height of the pull column and guide the construction;

[0060] 7.3) Finite element analysis is performed on the parts where the support beams are removed. According to the finite element analysis, during the removal of the frame columns, the axial force of the columns of the intersecting frame beams (taking the cross beams as an example) changes during the cutting process, so the supporting force value is adjusted. It is necessary to set vertical strain monitoring points on the frame columns.

[0061] 8) Remove the supports and columns to be removed; after reinforcement is completed, unload in stages, with the number of stages not less than five, and control the unloading value of each stage through displacement deformation monitoring; the first stage unloading value is 40KN, and the remaining stages are 50KN each. At the same time, observe the displacement changes of related components and nodes to provide a basis for judgment for subsequent unloading control; when the CGM grouting of the enlarged section reaches 100% strength and the prestressing is completed, remove the jack support, use a rope saw to cut and remove the concrete columns of this layer, and the support beam and column pulling are completed.

[0062] The above are only specific embodiments disclosed in the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for replacing a beam-supporting and column-removing support device, characterized in that: The supporting device for supporting beams and columns comprises a double web H-shaped steel, a horizontal support H-shaped steel and a jack which are arranged in sequence from top to bottom. Pads are arranged on both sides of the double web H-shaped steel, a steel pad is arranged under the jack, an anti-fall support H-shaped steel is arranged on the side of the jack, and a stiffening plate is arranged inside the horizontal support H-shaped steel. The underpinning method comprises the following steps: 1) Construction simulation: Before construction, the force simulation of the support scheme was carried out, and the finite element calculation software YJK 1.8.3.0 was used for analysis and simulation. The three force conditions in the column extraction support were simulated: the force condition when the rectangular hole was statically cut in the original concrete column and supported by the remaining part of the concrete column; the force condition when the remaining part of the concrete column was cut after the jack was lifted; the force analysis of the jack-supported steel; 2) Clear the upper load; clear the load on the slab within the span above the column extraction position, remove the floor slab around the column extraction position according to the drawing requirements, and chisel the concrete surface of the reinforced beams and columns; 3) Laying out the holes for the columns to be removed; before construction, pop out the positioning lines for the holes for the columns to be removed, and use a rope saw to open the holes for the columns to be removed; 4) Install the replacement device for supporting beams and columns; 4.1) According to the calculation of the Explorer software and the design drawing parameters, the double web H-shaped steel, horizontal support H-shaped steel, anti-fall support H-shaped steel, steel pad and pad models are calculated, and the steel material is Q345B; 4.2) Lay a steel pad under the opening of the column to be removed to ensure that the supporting jack remains stable and the concrete on the lower contact surface is evenly stressed; 4.3) Use the chain hoisting jack to the center hole of the column and place it steadily, and install the anti-fall support H-shaped steel, horizontal support H-shaped steel, double web H-shaped steel and pads in sequence; 5) Lifting with jack; 6) Increase the cross section of the prestressed beam; tie the steel bars of the support beam, tie the steel bars of the beam with increased cross section, install the prestressed corrugated pipe, prestressed tendons and nodes; then support the formwork and pour the CGM grouting material; after the grouting material reaches the strength, tension the prestressed tendons; 7) Remove the supports and columns to be removed; after reinforcement is completed, unload in stages, with the number of stages not less than five, and control the unloading value of each stage through displacement deformation monitoring; the first stage unloading value is 40KN, and the remaining stages are 50KN each. At the same time, observe the displacement changes of related components and nodes to provide a basis for judgment for subsequent unloading control; when the CGM grouting of the enlarged section reaches 100% strength and the prestressing is completed, remove the jack support, use a rope saw to cut and remove the concrete columns of this layer, and the support beam and column pulling are completed.

2. The underpinning method of the underpinning device for supporting beams and columns according to claim 1, characterized in that: The specific steps of step 5) are as follows: 5.1) Determine the specifications of the jack based on construction simulation calculations; 5.2) Use the original structural columns as supports and test the jacks first. After the test, start jacking slowly at first to observe whether there are any abnormalities in the structural systems. The jacking process is carried out in stages. There should be a certain pause between each stage of loading to allow the structure to deform fully. Track and monitor on site, read the support top displacement and support top reaction force, and compare and verify with the computer simulation. When the jacking reaction force reaches the construction simulation calculation value, stop jacking. At the same time, after confirming that the steel bars have reached the zero stress state based on the real-time monitoring data, use a hydraulic rope saw to synchronously cut the remaining concrete on both sides. The cutting process is tracked and monitored and settled in real time until it is completely separated from the original structure after cutting is completed.

3. The underpinning method of the underpinning device for supporting beams and columns according to claim 2, characterized in that: The steps of prestressing and construction monitoring are also included between step 6) and step 7), and the steps of prestressing and construction monitoring include the following steps: 1) When the strength of the CGM grouting material of the prestressed beam reaches 100%, the prestressed steel strands are tensioned; through real-time analysis of the monitoring structure, the entire column pulling process can be well controlled, potential dangers can be predicted and discovered in a timely manner, and corresponding protective measures can be formulated accordingly to ensure structural safety during the entire column pulling process; 2) Two displacement meters are symmetrically arranged at the column head position to monitor the displacement changes of the column during the lifting and unloading process, so as to control the displacement of the lifting height of the column and guide the construction; 3) Finite element analysis is performed on the parts where the support beams are removed. According to the finite element analysis, during the removal of the frame columns, the axial force of the frame beams intersecting with them changes during the cutting process, so the supporting force value is adjusted. It is necessary to set vertical strain monitoring points on the frame columns.

4. The underpinning method for the underpinning device for supporting beams and columns according to any one of claims 1 to 3, characterized in that: The jack is a hydraulic jack.

5. The underpinning method of the underpinning device for supporting beams and columns according to claim 4, characterized in that: There are two jacks, which are connected in parallel, and an oil pump provides lifting power. The two jacks are respectively provided with hydraulic oil nozzle switches.

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