Vibration isolation support replacing and mounting device for existing building and construction method

Abstract

The invention discloses a vibration isolation support replacing and mounting device for an existing building and a construction method, and relates to the technical field of existing building reinforcement, the vibration isolation support replacing and mounting device comprises a temporary support and a permanent support, and the temporary support is arranged on the outer side of an old vibration isolation support and used for supporting an existing structure; the existing structure comprises an upper structure and a lower structure, the bottom of the temporary support abuts against the lower structure, and the top of the temporary support abuts against the upper structure; the upper structure comprises frame beams, floor slabs and first-layer frame columns, and the lower structure is a foundation; the bottom of the old vibration isolation support abuts against the top face of the lower column pier, and the top of the old vibration isolation support abuts against the bottom face of the upper column pier. The effect of only jacking but not lifting can be achieved when the vibration isolation support is replaced or installed on an existing building, the additional internal force influence on the upper structure caused by the displacement difference between columns when the upper structure is jacked can be avoided, the problems that the upper building cracks and the internal force of the upper structure is redistributed are avoided, construction is rapid and convenient, the construction difficulty is small, and the construction cost is low. And the construction cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of existing building reinforcement, and in particular to a vibration isolation support replacement and installation device for an existing building and a construction method. Background Art

[0002] Seismic isolation systems installed between the foundation, floor, or lower structure and upper structure of a building can reduce horizontal seismic input to the upper structure by extending the structure's natural vibration period, thereby achieving the desired seismic protection requirements. When existing building isolation bearings are damaged or when existing traditional seismic buildings are retrofitted and reinforced to become isolation structures, isolation bearings need to be replaced or installed.

[0003] Currently, replacing vibration isolation bearings typically involves setting up temporary supports on site, using jacks to lift the superstructure by 10mm or more, and then replacing the bearings. This lifting method can cause cracks in the superstructure and redistribute internal forces, increasing construction difficulty, risk, and cost.

[0004] Therefore, the present invention proposes a replacement and installation device and construction method for vibration isolation bearings for existing buildings. Summary of the Invention

[0005] The purpose of the present invention is to solve the defects in the prior art and to propose a replacement and installation device and construction method for vibration isolation bearings for existing buildings.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for replacing and installing vibration isolation supports for existing buildings includes a temporary support and a permanent support. The temporary support is arranged outside the old vibration isolation support and is used to support the existing structure. The existing structure includes an upper structure and a lower structure, and the bottom of the temporary support is against the lower structure, and the top of the temporary support is against the upper structure. The upper structure includes frame beams, floor slabs, and first-floor frame columns, and the lower structure serves as the foundation. The bottom of the old vibration isolation support is against the top surface of the lower column pier, and the top of the old vibration isolation support is against the bottom surface of the upper pier.

[0008] The temporary support includes a temporary jack, a supporting steel pipe, and a first steel plate. The first steel plate is provided between the base of the temporary jack and the top surface of the foundation, the first steel plate is provided between the telescopic head of the temporary jack and the lower end of the supporting steel pipe, and the first steel plate is provided between the upper end of the supporting steel pipe and the bottom surface of the frame beam.

[0009] The permanent support includes multiple small jacks. After the upper section of the lower pier is removed, the base of each small jack is against the top surface of the lower pier through the second steel plate, and the top surface of each small jack is against the bottom surface of the embedded plate of the support through the second steel plate, and against the top surface of the embedded plate of the support. The top surface of the new seismic isolation support is against the bottom surface of the upper pier.

[0010] A construction method for replacing and installing a vibration isolation support for an existing building, the method comprising the following steps:

[0011] Step 1: Measure the height of the old isolation bearing to prepare for accurately measuring the compression of the old isolation bearing;

[0012] Step 2: Use temporary jacks to support the existing structure. Apply a certain pre-load force to the temporary jacks to tighten the upper structure. During the process of using temporary jacks to support the existing structure, it is necessary to monitor the deformation and cracks of the frame beams and floor slabs in the existing structure, as well as the verticality of the first-floor frame columns, so that the frame beams and floor slabs always remain in their original positions.

[0013] Step 3: Remove the mounting bolts of the old seismic isolation bearing, chisel out a section of the lower column pier, and remove the old seismic isolation bearing at the same time; when chiseling out the concrete of the lower column pier, retain the longitudinal reinforcement of the lower column pier. After the concrete is chiseled out, clean it to remove impurities and loose concrete;

[0014] Step 4: Accurately measure the compression of the old vibration isolation support;

[0015] Step 5: Install a small jack at the position of the lower pier; level the lower pier where the small jack is installed, and level the bottom of the upper pier where the new seismic isolation bearing is installed; polish the surface of the small jack to form a rough surface that combines with the concrete;

[0016] Step 6: Accurately place the new isolation bearings and make necessary adjustments and calibrations;

[0017] Step 7: Use a small jack to apply pressure to compress the new isolation bearing; use a small jack to tighten the new isolation bearing to the upper pier; pay attention to the influence of the initial rebound when loading with the small jack, and control the loading rate. During the compression of the new isolation bearing, it is necessary to monitor the deformation and cracks of the frame beams and floor slabs in the existing structure, as well as the verticality of the first-floor frame columns, so that the frame beams and floor slabs always remain in their original positions; until the compression of the new isolation bearing is close to that of the old isolation bearing; during this process, the pressure of the surrounding temporary jacks is gradually unloaded to zero;

[0018] Step 8: Lock the small jack, tie the steel bars, expand the cross section and cast the lower column pier;

[0019] Step 9: Tighten the mounting bolts of the new isolation support;

[0020] Step 10: After the strength of the newly cast lower pier reaches the requirements for demolding, remove the temporary jack.

[0021] Furthermore, the steel bar binding in step eight includes newly added longitudinal bars, newly added stirrups, and tie bars.

[0022] Furthermore, in the step 2, corresponding measures need to be taken to ensure that the temporary jack is securely connected to the existing structure to prevent the temporary jack from falling off or shifting during the support process.

[0023] Furthermore, in step seven, corresponding measures need to be taken to ensure that the small jack is securely connected to the lower column pier to prevent the small jack from shifting during the installation and compression of the new seismic isolation bearing, thereby always maintaining the stability of the small jack.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention can achieve the effect of "only jacking up without lifting" when replacing or installing vibration isolation supports in existing buildings, avoid the influence of additional internal forces on the superstructure caused by the displacement difference between columns when jacking up the superstructure, avoid the problems of cracking of the superstructure and redistribution of the internal forces of the superstructure, and its construction method is quick and convenient, with low construction difficulty, which can reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] Figure 1 This is a schematic diagram of the temporary support supporting the existing structure in the present invention;

[0028] Figure 2 for Figure 1 AA cross-section diagram in;

[0029] Figure 3 This is a schematic diagram of step 3 after the top of the lower pier is chiseled out and the old isolation bearing is removed;

[0030] Figure 4 This is a schematic diagram of steps 5 to 7 after the small jack and new vibration isolation support are installed;

[0031] Figure 5 This is a schematic diagram of step eight after locking the small jack, tying the steel bars, and expanding the cross-section to cast the lower column pier;

[0032] Figure 6 for Figure 5 BB cross-section diagram in;

[0033] Figure 7 for Figure 5CC cross-section diagram in;

[0034] Figure 8 for Figure 5 DD cross-section diagram in.

[0035] In the figure: 1 foundation; 2 lower column pier; 3 old seismic isolation bearing; 4 upper pier; 5 first-floor frame column; 6 frame beam; 7 floor slab; 8 temporary jack; 9 supporting steel pipe; 10 first steel pad; 11 existing longitudinal reinforcement of lower column pier; 12 small jack; 13 second steel pad; 14 new seismic isolation bearing; 15 buried plate under bearing; 16 newly added longitudinal reinforcement; 17 newly added stirrups; 18 tie reinforcement; 19 expanded section cast lower column pier. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention;

[0037] Reference Figure 1-8 A vibration isolation support replacement and installation device for an existing building includes a temporary support and a permanent support. The temporary support is arranged on the outside of the old vibration isolation support 3 to support the existing structure. The existing structure includes an upper structure and a lower structure, and the bottom of the temporary support is against the lower structure, and the top of the temporary support is against the upper structure. The upper structure includes a frame beam 6, a floor slab 7 and a first-floor frame column 5, and the lower structure is a foundation 1. The bottom of the old vibration isolation support 3 is against the top surface of the lower column pier 2, and the top of the old vibration isolation support 3 is against the bottom surface of the upper pier 4.

[0038] The temporary support includes a temporary jack 8, a supporting steel pipe 9, and a first steel plate 10. The first steel plate 10 is provided between the base of the temporary jack 8 and the top surface of the foundation 1, the first steel plate 10 is provided between the telescopic head of the temporary jack 8 and the lower end of the supporting steel pipe 9, and the first steel plate 10 is provided between the upper end of the supporting steel pipe 9 and the bottom surface of the frame beam 6;

[0039] The permanent support includes multiple small jacks 12. After the upper section of the lower pier 2 is removed, the base of each small jack 12 is against the top surface of the lower pier 2 through the second steel pad 13, and the top surface of each small jack 12 is against the bottom surface of the support buried plate 15 through the second steel pad 13, and the top surface of the new seismic isolation bearing 14 is against the bottom surface of the upper pier 4.

[0040] A construction method for replacing and installing a vibration isolation support for an existing building, the method comprising the following steps:

[0041] Step 1: Measure the height of the old vibration isolation support 3 to prepare in advance for accurately measuring the compression amount of the old vibration isolation support 3;

[0042] Step 2: Use temporary jacks 8 to support the existing structure; apply a certain pre-loading force to the temporary jacks 8 to tighten the upper structure; during the process of using temporary jacks 8 to support the existing structure, it is necessary to monitor the deformation and cracks of the frame beams 6 and floor slabs 7 in the existing structure and the verticality of the first-floor frame columns 5, so that the frame beams 6 and floor slabs 7 always remain in their original positions; Figure 1 As shown, temporary jacks 8 are set around the old vibration isolation support 3 to temporarily support the existing structure.

[0043] Step 3: Remove the mounting bolts of the old seismic isolation support 3, chisel off a section of the lower column pier 2, and remove the old seismic isolation support 3 at the same time; when chiseling off a section of the concrete of the lower column pier 2, retain the longitudinal reinforcement of the lower column pier 2. After the concrete is chiseled out, clean it to remove impurities and loose concrete; Figure 3 and Figure 4 As shown in FIG, after a section of concrete on the upper portion of the lower pier 2 is removed, the existing longitudinal reinforcement 11 of the lower pier is exposed.

[0044] Step 4: Accurately measure the compression of the old vibration isolation support 3;

[0045] Step 5: Install a small jack 12 at the position of the lower pier 2; level the position of the lower pier 2 where the small jack 12 is installed, and level the bottom of the upper pier 4 where the new seismic isolation bearing 14 is installed; polish the surface of the small jack 12 to form a rough surface that combines with the concrete; Figure 4 As shown in , the base of each small jack 12 is against the top surface of the lower pier 2 through the second steel plate 13, and the top surface of each small jack 12 is against the bottom surface of the support buried plate 15 through the second steel plate 13, and the top surface of the new seismic isolation bearing 14 is against the bottom surface of the upper pier 4.

[0046] Step 6: Accurately place the new seismic isolation bearing 14 and perform necessary adjustments and calibrations;

[0047] Step 7: Apply pressure through the small jack 12 to compress the new vibration isolation support 14; use the small jack 12 to tighten the new vibration isolation support 14 to the upper pier 4; pay attention to the influence of the initial rebound when loading with the small jack 12, control the loading rate, and monitor the deformation and cracks of the frame beam 6 and floor slab 7 in the existing structure and the verticality of the first-floor frame column 5 during the compression of the new vibration isolation support 14, so that the frame beam 6 and floor slab 7 always remain in their original position and do not move; until the compression of the new vibration isolation support 14 is close to that of the old vibration isolation support 3; during this process, the pressure of the temporary jacks 8 around it is gradually unloaded to zero;

[0048] Step 8: Lock the small jack 12, tie the steel bars, expand the cross section and cast the lower column 19; Figure 5-Figure 8 As shown, the binding reinforcement in step eight includes newly added longitudinal reinforcement 16, newly added stirrups 17, and tie reinforcement 18.

[0049] Step 9: Tighten the mounting bolts of the new seismic isolation support 14;

[0050] Step 10: After the strength of the newly cast lower pier reaches the requirements for demoulding, remove the temporary jack 8.

[0051] Furthermore, in step 2, corresponding measures need to be taken to ensure that the temporary jack 8 is securely connected to the existing structure to prevent the temporary jack 8 from falling off or shifting during the support process. In the present application, a first steel pad 10 is provided between the base of the temporary jack 8 and the top surface of the foundation 1, a first steel pad 10 is provided between the telescopic head of the temporary jack 8 and the lower end of the supporting steel pipe 9, and a first steel pad 10 is provided between the upper end of the supporting steel pipe 9 and the bottom surface of the frame beam 6; thereby ensuring that the temporary jack 8 is securely connected to the existing structure.

[0052] Furthermore, in step seven, corresponding measures need to be taken to ensure that the small jack 12 is securely connected to the lower pier 2, so as to prevent the small jack 12 from shifting during the installation and compression of the new seismic isolation bearing 14, and to always maintain the stability of the small jack 12. In the present application, after the upper section of the lower pier 2 is removed, the base of each small jack 12 is abutted against the top surface of the lower pier 2 through the second steel pad 13, and the top surface of each small jack 12 is abutted against the bottom surface of the bearing buried plate 15 through the second steel pad 13, and against the top surface of the bearing buried plate 15, and the top surface of the new seismic isolation bearing 14 is abutted against the bottom surface of the upper pier 4. This ensures that the small jack 12 is securely connected to the lower pier 2.

Claims

1. A vibration isolation support replacement and installation device for an existing building, including temporary support and permanent support, characterized in that: The temporary support is arranged outside the old vibration isolation support (3) and is used to support the existing structure; the existing structure includes an upper structure and a lower structure, and the bottom of the temporary support is against the lower structure, and the top of the temporary support is against the upper structure; the upper structure includes a frame beam (6), a floor slab (7) and a first-floor frame column (5), and the lower structure is a foundation (1); the bottom of the old vibration isolation support (3) is against the top surface of the lower column pier (2), and the top of the old vibration isolation support (3) is against the bottom surface of the upper pier (4); The temporary support comprises a temporary jack (8), a supporting steel pipe (9), and a first steel pad (10); the first steel pad (10) is provided between the base of the temporary jack (8) and the top surface of the foundation (1); the first steel pad (10) is provided between the telescopic head of the temporary jack (8) and the lower end of the supporting steel pipe (9); and the first steel pad (10) is provided between the upper end of the supporting steel pipe (9) and the bottom surface of the frame beam (6); The permanent support includes a plurality of small jacks (12). After the upper section of the lower pier (2) is removed, the base of each small jack (12) is against the top surface of the lower pier (2) through the second steel pad (13), and the top surface of each small jack (12) is against the bottom surface of the support buried plate (15) through the second steel pad (13), and is against the top surface of the support buried plate (15). The top surface of the new seismic isolation support (14) is against the bottom surface of the upper pier (4).

2. A construction method for replacing and installing the vibration isolation support for an existing building as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Measure the height of the old vibration isolation support (3) to prepare in advance for accurately measuring the compression amount of the old vibration isolation support (3); Step 2: Support the existing structure with a temporary jack (8); apply a certain pre-loading force to the temporary jack (8) to tighten the upper structure; during the process of supporting the existing structure with the temporary jack (8), it is necessary to monitor the deformation and cracks of the frame beams (6) and the floor slabs (7) in the existing structure and the verticality of the first-floor frame columns (5), so that the frame beams (6) and the floor slabs (7) always remain in their original positions; Step 3: Remove the mounting bolts of the old seismic isolation support (3), chisel out a section of the lower column pier (2), and remove the old seismic isolation support (3) at the same time; when chiseling out the concrete of a section of the lower column pier (2), retain the longitudinal steel bars of the lower column pier (2). After the concrete is chiseled out, clean it to remove impurities and loose concrete; Step 4: Accurately measure the compression of the old vibration isolation support (3); Step 5: Install a small jack (12) at the position of the lower column pier (2); level the position of the lower column pier (2) where the small jack (12) is installed, and level the bottom of the upper pier (4) where the new seismic isolation support (14) is installed; polish the surface of the small jack (12) to form a rough surface that combines with the concrete; Step 6: Accurately place the new isolation bearing (14) and make necessary adjustments and calibrations; Step 7: Apply pressure to compress the new vibration isolation support (14) through the small jack (12); Use the small jack (12) to press the new vibration isolation support (14) against the upper pier (4); Pay attention to the influence of the initial rebound when loading the small jack (12), control the loading rate, and monitor the deformation and cracks of the frame beam (6) and the floor slab (7) in the existing structure and the verticality of the first-floor frame column (5) during the compression of the new vibration isolation support (14), so that the frame beam (6) and the floor slab (7) always remain in their original position; until the compression of the new vibration isolation support (14) is close to the compression of the old vibration isolation support (3); During this process, the pressure of the temporary jacks (8) around is gradually unloaded to zero; Step 8: Lock the small jack (12), tie the steel bars, expand the cross section and cast the lower column pier (19); Step 9: Tighten the mounting bolts of the new seismic isolation support (14); Step 10: After the strength of the newly cast lower pier reaches the requirements for demoulding, remove the temporary jack (8).

3. The construction method for replacing and installing a vibration isolation support for an existing building according to claim 2, characterized in that: The binding reinforcement in step eight includes newly added longitudinal reinforcement (16), newly added stirrups (17), and tie bars (18).

4. The construction method for replacing and installing a vibration isolation support for an existing building according to claim 2, characterized in that: In the second step, corresponding measures need to be taken to ensure that the temporary jack (8) is firmly connected to the existing structure to prevent the temporary jack (8) from falling off or deflecting during the support process.

5. The construction method for replacing and installing a vibration isolation support for an existing building according to claim 2, characterized in that: In step seven, corresponding measures need to be taken to ensure that the small jack (12) is securely connected to the lower pier (2) to prevent the small jack (12) from shifting during the installation and compression of the new seismic isolation support (14), thereby always maintaining the stability of the small jack (12).

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