CN107724559A - Existing building base isolation reinforcement construction process - Google Patents

Abstract

The invention discloses a construction process for seismic isolation reinforcement of an existing building; the construction process for seismic isolation reinforcement is as follows: firstly construct the lower pier, then construct the upper pier, and finally cut the structural column and install the isolation layer in the space of the isolation layer. Shock mount. In addition, in order to consolidate the normal implementation of the seismic isolation reinforcement construction process, the present invention designs a specific upper pier structure, the installation structure of the seismic isolation bearing and the underpinning structure; the present invention can improve the seismic isolation through the above construction process. The installation quality of the support is improved, the cost is reduced, and the total construction period is greatly shortened.

Description

Seismic isolation and strengthening construction process of existing buildings

technical field

The invention belongs to the technical field of anti-seismic strengthening and transformation of existing buildings, and in particular relates to a construction process for anti-seismic strengthening of existing buildings.

Background technique

In the seismic isolation reinforcement project of existing buildings, the general sequence of seismic isolation layer construction is: excavation of earthwork, underpinning support, cutting column concrete, pouring of lower buttress, installation of seismic isolation support, pouring of upper buttress and top Beam slab. Only then can the construction of the upper part of the building decoration project be carried out. This kind of construction can be called "straight-line" construction process.

The existing "straight-line" construction process generally consists of earthwork excavation, construction of underpinning supports, pouring of lower buttresses, installation of supports, pouring of upper buttresses, maintenance, removal of underpinning supports, pouring of beam-slab concrete, and maintenance , Ground and first floor decoration engineering construction,……. The construction content is along a straight line, and the construction cannot be poor, resulting in a longer total construction period. In addition, seismic isolation bearings are needed soon after the start of construction. Generally, the production and testing of seismic isolation bearings takes a long time, which will inevitably cause delays. According to the construction experience of the project, complete all seismic isolation reinforcement and necessary restoration and decoration works, with a total construction period of about 80-90 days.

"Straight-line" construction has the following main characteristics:

(1) Set the underpinning bracket formed by the steel column and the steel joist;

(2) The joist is connected with the concrete column by tension screw or other means;

(3) Cut the column concrete first, then install the seismic isolation bearing, and finally pour the upper pier and beam-slab structure.

(4) The service time of the underpinning bracket begins before the concrete of the column is cut, and finally the support is installed, and even the concrete curing age of the upper pier ends.

"Straight line" construction has the following problems:

(1) The manufacture of the bracket structure is welded by shaped steel beams and columns, which consumes a large amount of steel, is expensive in materials and labor, and is not easy to reuse;

(2) Column cutting "wire saw" is slow and expensive, and the cut concrete surface is difficult to meet the flatness requirements for the installation of seismic isolation bearings;

(3) The support time of the bracket is long and the risk is high. The micro-vibration of the surrounding site has an impact on building safety. In the event of an earthquake, the safety risk of the building is extremely high;

(4) The cost is high. This is mainly reflected in material consumption, bracket production and support time.

Seismic isolation technology has been quite mature and perfect in theoretical research, isolation support manufacturing technology, isolation analysis and design. However, the existing underpinning construction technology is expensive in materials, time-consuming, labor-intensive, expensive and risky. This seriously hinders the application of seismic isolation technology in the seismic isolation and reinforcement of existing buildings.

For a large number of existing primary and secondary school buildings and hospitals, the anti-seismic standard does not meet the requirements of the national standard. Due to the long construction period of the reinforcement and the impact on the teaching work, the anti-seismic reinforcement cannot be carried out. In seismic reinforcement, seismic isolation technology has outstanding technical and economic advantages compared with seismic technology, and the construction period is also greatly shortened, but it still cannot meet the actual needs of teaching and hospitals. Therefore, it is necessary to improve the construction level of seismic isolation and reinforcement, reduce the cost and shorten the construction period. Meet the needs of practical engineering.

Contents of the invention

The present invention aims at the deficiencies of the prior art, on the basis of fully understanding the characteristics of the shock-isolation structure and making full use of the bearing capacity of the structural members, by optimizing the structure of the upper pier, the installation method of the shock-isolation bearing, and the ingenious underpinning structure Set up and optimize the construction process A series of complete sets of technologies have completely revolutionized the underpinning construction technology for seismic isolation and reinforcement. It solves the problems existing in the traditional underpinning technology, can effectively improve the construction level of seismic isolation reinforcement, reduce the cost and shorten the construction period.

For realizing above-mentioned technical purpose, the present invention will take following technical scheme:

A construction process for seismic isolation and reinforcement of an existing building, comprising the following steps:

(1) According to the design requirements for seismic isolation reinforcement of existing buildings and the structural characteristics of the selected seismic isolation bearings, determine the installation position of the seismic isolation bearings in the space of the existing building isolation layer, and determine the location above the seismic isolation bearings. For the upper pier and the lower pier under the seismic isolation support, determine the connection measures for installing the seismic isolation support between the upper pier and the lower pier, where:

The upper pier and the lower pier are combined structures of existing structural columns and newly poured concrete structures;

The connection measures include the upper connection measures and the lower connection measures; the upper connection measures include the upper embedded plate, the upper connecting plate of the support, welding locking parts and grouting materials; the lower connecting measures include the lower embedded plate, the lower connecting plate of the support, welding Locking parts and grouting materials;

The upper part of the isolation bearing is connected with the upper pier through the upper connection measures, and the lower part of the isolation support is connected with the lower support pier through the lower connection measures;

(2) Pouring the upper and lower piers

According to the specific structure of the upper buttress and the lower buttress determined in step (1), respectively plant bars or bind steel bars, first pour to form the lower buttress, and then pour to form the upper buttress;

When pouring the lower pier, set the lower embedded slab on the top surface, and the lower embedded slab is anchored in the newly poured concrete structure of the lower pier through the slab anchor bars; when pouring the upper pier, set the upper embedded slab on the bottom surface, and the upper embedded slab Anchored in the newly poured concrete structure of the upper pier through the plate anchor bar;

(3) Install the underpinning structure

Install a number of pillars between the upper and lower piers, and the two ends of each pillar are respectively pressed against the upper and lower piers;

(4) Cutting structural columns

Cut off the structural columns within the installation height range of the isolation support;

(5) Install the vibration isolation support

First put the shock-isolation support in place, at this time, the upper end of the shock-isolation support is installed with the upper connecting plate of the support through the bolt assembly, and the lower end of the shock-isolation support is installed with the lower connecting plate of the support through the bolt assembly; The axis of each bolt assembly of the connecting plate and the lower connecting plate of the support is taken as the reference, and the threaded locking parts are welded on the surface of the upper embedded plate and the lower embedded plate correspondingly; then, through the threaded locking parts of the upper embedded plate Cooperate with the corresponding bolt assembly on the connecting plate on the support, install the upper end of the seismic isolation support to the upper embedded plate through the connecting plate on the support; similarly, through the threaded locking parts of the lower embedded plate and the support The matching connection of the corresponding bolt components on the lower connecting plate installs the lower end of the shock-isolation support to the lower embedded plate through the lower connecting plate of the support;

(6) Filling the grouting mixture

Between the bottom surface of the upper pier and the upper connection plate of the support, between the top surface of the lower pier and the lower connection plate of the support, respectively pour the grouting material mixture;

(7) Remove the underpinning structure.

Remove the pillars and the underpinning is complete.

As a further improvement of the present invention, the upper pier described in step (2) is poured through the following steps:

2.1. First remove the outer concrete protective layer at the corresponding position between the anchor bar of the pier and the main bar of the existing structural column to form a circumferential groove and expose the main bar of the structural column at this position;

2.2. By means of welding and fixing, the anchor bars of each pier are welded and fixed to the main bars of the existing structural columns one by one, so that the anchor bars of each pier can form lantern bars with the main bars of the existing structural columns;

2.3. Arrange horizontally closed stirrups on the outside of the welded part of the anchor bar of the pier and the main bar of the existing structural column, so that the horizontal closed stirrup tightens the welded part of the anchor bar of the pier and the main bar of the existing structural column;

2.4. Set up the main reinforcement of the upper pier: Arrange the main reinforcement of the upper pier in the three directions of X, Y, and Z within the range of the lantern reinforcement. The main reinforcement adopts the shape of a stirrup, and the original load-bearing frame column concrete column is enclosed to form a reinforcement cage;

2.5. The lower surface of the upper pier is arranged with an upper embedded plate and plate anchor bars;

2.6. According to the normal construction requirements, pour the concrete layer to form the upper pier.

As a further improvement of the present invention, the anchor bar of the pier is shape settings; the The two welded ends of the C-shaped anchor bar are formed by bending the two ends of the C-shaped steel bar inwards respectively.

As a further improvement of the present invention, the horizontal closed stirrups are arranged with The bending position adjacent to the welded end of the shaped anchoring tendon.

As a further improvement of the present invention, the anchoring bars of the pier include anchoring bars at column edges and anchoring bars at column corners; the anchor bars at column edges are arranged vertically to the column edges of existing structures; and the anchor bars at column corners are arranged in two ways: , one of which is arranged along the diagonal direction of the existing structural column. At this time, the number of the main reinforcement of the existing structural column and the anchoring reinforcement of the pier are the same, and the anchoring reinforcement of the pier is arranged in one-to-one correspondence with the main reinforcement of the existing structural column; the other The arrangement method includes two anchor bars at the corners of the column, each of which is arranged close to the diagonal line of the existing structural column and perpendicular to the edge of the existing structural column.

As a further improvement of the present invention, the pillar adopts the whole steel pipe column or steel pipe concrete column.

As a further improvement of the present invention, in step (5), the bolt locking member is a locking bolt or a threaded sleeve.

As a further improvement of the present invention, the upper and lower embedded panels are rectangular, square or circular; and when the upper and lower embedded panels are rectangular or square, the middle part of each edge of the embedded panel One or more sets of plate anchoring ribs are arranged at each position.

As a further improvement of the present invention, the cutting of the structural column in step (4) is specifically carried out using a rhinestone cutting method, including the following steps:

4.1. Drill a row of holes on the bottom of the upper pier, and re-drill the raised part to form a cutting surface;

4.2. Drill a row of holes on the top surface of the lower pier, and re-drill the raised part to form a cutting surface;

4.3 When cutting, the steel bars and concrete of the structural column shall be cut together.

As a further improvement of the present invention, after pouring the grouting material mixture described in step (6), there is also a secondary grouting step, specifically: using pressure grouting, the upper connecting plate of the support and the upper pier Grouting is performed on the concrete shrinkage cracks between the bottom connecting plate of the support and the lower pier to ensure that the space between the isolation support and the upper pier and the lower pier is densely filled.

According to above-mentioned technical scheme, with respect to prior art, the present invention has following advantage:

(1) Reasonable construction organization

According to the seismic isolation reinforcement method of the present invention, the civil construction can complete the construction from the lower pier to the roof beam slab in one go, and the upper ground and decoration restoration works can be prepared during the concrete maintenance period, and the column cutting and seismic isolation support can be completed. Preparation work, but also the construction of outdoor projects. Relying on process optimization such as reducing the number of concrete pours and cross-operation, and considering changes in the age of concrete, the total construction period can generally be advanced by about 30 days.

(2) Make full use of structural components

The invention makes full use of the bearing capacity of the structural components for underpinning, and does not need the manufacture and installation of steel brackets. Only steel pipe stubs (jacking pillars) are required. Material consumption is greatly reduced. The construction is simple and easy.

(3) Small risk and easy to control

The cutting of the structural column of the present invention and the installation of the shock-absorbing support can generally be completed in 2 days, so the building has safety risks in only 2 days.

Description of drawings

Fig. 1 is the construction flowchart of existing building seismic isolation reinforcement described in the present invention;

Fig. 2 is the construction structural drawing of existing building seismic isolation reinforcement described in the present invention;

Fig. 3 is a schematic diagram of the structure of the upper pier of the present invention;

Fig. 4 is a schematic diagram of the installation of the shock-isolation bearing of the present invention;

Fig. 5 is a schematic diagram of the underpinning structure of the present invention;

In the figure: 11, the newly poured concrete of the upper pier; 12, the original structural column of the upper pier; 2, the seismic isolation bearing; 31, the newly poured concrete of the lower pier; 32, the original structural column of the lower pier;

11-1, buttress anchor reinforcement; 11-2, horizontal closed stirrup; 11-3, protective layer groove; 11-4, column main reinforcement; 11-5, external concrete layer; 12, structural column;

41-embedded plate; 42-plate anchor rib; 43-bolt locking piece; 44-grouting material mixture; 45-bolt assembly; 46-support connecting plate;

51‐Jacking pillar; 52‐Steel wedge; 6‐Structural column to be truncated.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The relative arrangements, expressions and numerical values of components and steps set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be positioned in other different ways (rotated 90 degrees or at other orientations) as well.

A kind of existing building seismic isolation strengthening construction process described in the present invention, as shown in Fig. 1, Fig. 2, comprises the following steps:

(1) According to the design requirements for seismic isolation reinforcement of existing buildings and the structural characteristics of the selected seismic isolation bearings, determine the installation position of the seismic isolation bearings in the space of the existing building isolation layer, and determine the location above the seismic isolation bearings. For the upper pier and the lower pier under the seismic isolation support, determine the connection measures for installing the seismic isolation support between the upper pier and the lower pier, where:

Both the upper pier and the lower pier are combined structures of the existing structural columns and the newly poured concrete structure; the upper part of the upper pier is a frame column, which forms an integral rigid horizontal member with the beam and slab on the first floor; the lower part of the lower pier is a structural Base.

The connection measures include the upper connection measures and the lower connection measures; the upper connection measures include the upper embedded plate and the upper connection plate of the support; the lower connection measures include the lower embedded plate and the lower connection plate of the support;

The upper part of the seismic isolation bearing is tightened with the upper pier through the upper connecting measures, and the lower part of the seismic isolation bearing is tightened with the lower supporting pier through the lower connecting measures;

Specifically, the shock-isolation support is installed between the upper and lower piers, and the shock-isolation support is detachable, and is connected with welded nuts on the pre-embedded plates of the upper and lower piers by bolts. Moreover, a grouting material mixture and pressure grouting are arranged between the support and the embedded plate.

The underpinning structure of the seismic isolation structure makes full use of the bearing capacity of the upper and buttress piers, the pillar height is small, the underpinning time is greatly shortened, and the safety and reliability of the structure are high.

(2) Pouring the upper and lower piers

According to the specific structure of the upper buttress and the lower buttress determined in step (1), respectively plant bars or bind steel bars, first pour to form the lower buttress, and then pour to form the upper buttress;

When pouring the lower pier, set the lower embedded slab on the top surface, and the lower embedded slab is anchored in the newly poured concrete structure of the lower pier through the slab anchor bars; when pouring the upper pier, set the upper embedded slab on the bottom surface, and the upper embedded slab Anchored in the newly poured concrete structure of the upper pier through the plate anchor bar; the upper and lower embedded plates are rectangular, square or circular; and when the upper and lower embedded plates are rectangular or square, the pre-embedded One or more groups of plate anchoring ribs are arranged at the middle of each plate edge of the buried plate.

The lower buttresses can be poured using existing pouring methods; while the upper buttresses are poured through the following steps:

2.1. First remove the outer concrete protective layer at the corresponding position between the anchor bar of the pier and the main bar of the existing structural column to form a circumferential groove and expose the main bar of the structural column at this position; wherein: the anchoring of the buttress Ribs, as shown in Figure 3, are shape settings; the The two welded ends of the C-shaped anchor bars are formed by bending the two ends of the C-shaped steel bar inwards to form correspondingly; There are two types of arrangement for the column edge of the structural column; there are two ways to arrange the anchor bars at the corner of the column, one of which is arranged along the diagonal direction of the existing structural column. And the anchor bars of the pier are arranged in one-to-one correspondence with the main bars of the existing structural columns; in another arrangement, the anchor bars at the corners of the columns include two, each of which is close to the diagonal line of the existing structural column and perpendicular to the edge of the existing structural column layout;

2.2. By means of welding and fixing, the anchor bars of each pier are welded and fixed to the main bars of the existing structural columns one by one, so that the anchor bars of each pier can form lantern bars with the main bars of the existing structural columns;

2.3. Arrange horizontal closed stirrups on the outside of the welded part of the anchor bar of the pier and the main bar of the existing structural column, so that the horizontal closed stirrup tightens the welded part of the anchor bar of the pier and the main bar of the existing structural column; where: the horizontal closed stirrup Ribs are arranged with The bending position adjacent to the welded end of the anchor bar;

2.4. Set up the main reinforcement of the upper pier: Arrange the main reinforcement of the upper pier in the three directions of X, Y, and Z within the range of the lantern reinforcement. The main reinforcement adopts the shape of a stirrup, and the original load-bearing frame column concrete column is enclosed to form a reinforcement cage;

2.5. The lower surface of the upper pier is arranged with an upper embedded plate and plate anchor bars;

2.6. According to the normal construction requirements, pour the concrete layer to form the upper pier.

(3) Install the underpinning structure

Install a number of pillars between the upper and lower piers, and the two ends of each pillar are respectively pressed against the upper and lower piers;

The pillar adopts the entire steel pipe column or steel pipe concrete column, which is arranged between the upper and lower piers and outside the installation position of the seismic isolation support, and the support can be assembled and disassembled flexibly.

After the pillar is tightened, the column concrete at the installation position of the isolation support can be cut, the isolation support can be installed, the gap between the isolation support and the upper and lower piers can be filled, and after grouting and compaction, the concrete strength After reaching the requirements, remove the pillars.

According to this step, an underpinning structure as shown in Figure (5) can be formed, including pillars, upper piers and lower piers. The upper and lower piers are respectively the upper and lower support structures of the seismic isolation pier, and the pillars are tightened with the upper and lower piers by wedge plates.

(4) Cutting structural columns

Cut off the structural columns within the installation height range of the isolation support;

When cutting, you need to pay attention to the following points:

(4.1) The column adopts rhinestone cutting method;

(4.2) Drill a row of holes on the bottom surface of the upper pier, and re-drill the raised part to form a cutting surface;

(4.3) Drill a row of holes on the top surface of the lower pier, and re-drill the raised part to form a cutting surface;

(4.4) When cutting, the steel bars are cut off together, and are reliably connected to the seismic isolation support through grouting and grouting;

(5) Install the vibration isolation support

First put the shock-isolation support in place, at this time, the upper end of the shock-isolation support is installed with the upper connecting plate of the support through the bolt assembly, and the lower end of the shock-isolation support is installed with the lower connecting plate of the support through the bolt assembly; The axis of each bolt assembly of the connecting plate and the lower connecting plate of the support is used as the reference, and the threaded locking parts are welded on the surface of the upper embedded plate and the lower embedded plate correspondingly; then, through the threaded locking parts of the upper embedded plate Cooperate with the corresponding bolt assembly on the connecting plate on the support, install the upper end of the shock-isolation support to the upper embedded plate through the connecting plate on the support; The matching connection of the corresponding bolt components on the lower connecting plate installs the lower end of the shock-isolation support to the lower embedded plate through the lower connecting plate of the support; wherein: the bolt locking member is a locking bolt or a threaded sleeve. Through step (5), the installation structure of the shock-isolation support shown in FIG. 4 can be obtained.

(6) Filling the grouting mixture

Between the bottom surface of the upper pier and the upper connection plate of the support, between the top surface of the lower pier and the lower connection plate of the support, respectively pour the grouting material mixture;

(7) Secondary grouting

After the strength of the grouting material meets the design requirements, use pressure grouting to fill and compact the microscopic gaps between the top of the grouting material and the structural components. Specifically: pressure grouting is used to grout the concrete shrinkage cracks between the upper connection plate of the support and the upper pier, and between the lower connection plate of the support and the lower pier, so as to ensure that the seismic isolation support and the upper pier, The filling between the lower buttresses is dense.

(8) Remove the underpinning structure.

Remove the pillars and the underpinning is complete.

Construction requirements:

(1) The strength and stiffness of the structural members should be designed to meet the stress requirements of the underpinning. Therefore, the design of the shear strength between the old and new concrete of the upper pier is particularly critical.

(2) For cutting machines and tools for concrete columns, considering the accuracy requirements of the installation elevation and levelness of the isolation support, the on-site cutting surface cannot meet the precision requirements of the mechanical support of the embedded plate and connecting plate of the isolation support, and other measures need to be taken. bridge the gap between the two.

(3) For the installation of the seismic isolation bearing, it is necessary to fully consider the installation space, the elevation of the concrete cutting surface, the levelness accuracy, the connection measures, etc., and design the appropriate installation method.

(4) Safety emergency plan. The necessary triangular support frames can be set up at the four corners of the house, vertically and horizontally, forming a stable structural restraint mechanism to prevent damage to the building due to vibration.

3, compared with prior art, effect and benefit of the present invention are:

(1) material saving

The complete set of technology of "post-underpinning" basically no longer uses materials such as steel beams and columns, and the consumption of steel materials is greatly reduced. Each support saves about 0.6 to 1.2 tons of steel.

(2) labor saving

The "back underpinning" complete set of technology cancels the manufacture and dismantling of steel brackets, and the concrete cutting adopts the water drilling method, which does not require wire saw cutting or manual chisel removal, and the construction is fast and convenient.

(3) Time saving

The "post-underpinning" technology construction reduces the number of concrete maintenance, and the internal underpinning construction of the isolation layer can be carried out simultaneously with the decoration construction on the top of the roof. Compared with the existing linear construction, the total construction period can be saved by about 30 days. Compared with the seismic reinforcement project of primary and middle school buildings, compared with the original minimum construction period of 80-90 days, it can be shortened to 50-60 days, and the construction can be safely completed during the summer vacation. For the seismic isolation and reinforcement of hospital buildings, the construction period can also be shortened by 30 days, greatly reducing the interference to medical work.

(4) Small safety risk

In the existing technology, the support time of the underpinning bracket is about 30 days, and the bracket has no bending and shear bearing capacity equivalent to that of the column. During this period, the superstructure is completely supported by the bracket, and the safety risk of the building is relatively large. "Post underpinning technology, the underpinning process is simple and fast, and the underpinning can be completed in about 1.5 days. The height of the short column is small and the stability is good. Therefore, the "post underpinning" technology has little impact on the safety of the building.

(5) Low cost

With post-underpinning construction technology, the total cost of the underpinning project is significantly reduced due to the saving of materials, labor and time, and 50% of the direct cost can be saved on the basis of the construction cost of the first underpinning.

Claims (10)

1. A kind of existing building seismic isolation reinforcement construction process is characterized in that, comprises the following steps: (1) According to the design requirements for seismic isolation reinforcement of existing buildings and the structural characteristics of the selected seismic isolation bearings, determine the installation position of the seismic isolation bearings in the space of the existing building isolation layer, and determine the location above the seismic isolation bearings. For the upper pier and the lower pier under the seismic isolation support, determine the connection measures for installing the seismic isolation support between the upper pier and the lower pier, where: The upper pier and the lower pier are combined structures of existing structural columns and newly poured concrete structures; The connection measures include the upper connection measures and the lower connection measures; the upper connection measures include the upper embedded plate, the upper connecting plate of the support, welding locking parts and grouting materials; the lower connecting measures include the lower embedded plate, the lower connecting plate of the support, welding Locking parts and grouting materials; The upper part of the isolation bearing is connected with the upper pier through the upper connection measures, and the lower part of the isolation support is connected with the lower support pier through the lower connection measures; (2) Pouring the upper and lower piers According to the specific structure of the upper buttress and the lower buttress determined in step (1), respectively plant bars or bind steel bars, first pour to form the lower buttress, and then pour to form the upper buttress; When pouring the lower pier, set the lower embedded slab on the top surface, and the lower embedded slab is anchored in the newly poured concrete structure of the lower pier through the slab anchor bars; when pouring the upper pier, set the upper embedded slab on the bottom surface, and the upper embedded slab Anchored in the newly poured concrete structure of the upper pier through the plate anchor bar; (3) Install the underpinning structure Install a number of pillars between the upper and lower piers, and the two ends of each pillar are respectively pressed against the upper and lower piers; (4) Cutting structural columns Cut off the structural columns within the installation height range of the isolation support; (5) Install the vibration isolation support First put the shock-isolation support in place, at this time, the upper end of the shock-isolation support is installed with the upper connecting plate of the support through the bolt assembly, and the lower end of the shock-isolation support is installed with the lower connecting plate of the support through the bolt assembly; The axis of each bolt assembly of the connecting plate and the lower connecting plate of the support is used as the reference, and the threaded locking parts are welded on the surface of the upper embedded plate and the lower embedded plate correspondingly; then, through the threaded locking parts of the upper embedded plate Cooperate with the corresponding bolt assembly on the connecting plate on the support, install the upper end of the shock-isolation support to the upper embedded plate through the connecting plate on the support; The matching connection of the corresponding bolt components on the lower connecting plate installs the lower end of the shock-isolation support to the lower embedded plate through the lower connecting plate of the support; (6) Filling the grouting mixture Between the bottom surface of the upper pier and the upper connection plate of the support, between the top surface of the lower pier and the lower connection plate of the support, respectively pour the grouting material mixture; (7) Remove the underpinning structure. Remove the pillars and the underpinning is complete. 2. The construction process for seismic isolation and strengthening of existing buildings according to claim 1, wherein the upper buttress described in step (2) is poured through the following steps: 2.1. First remove the outer concrete protective layer at the corresponding position between the anchor bar of the pier and the main bar of the existing structural column to form a circumferential groove and expose the main bar of the structural column at this position; 2.2. By means of welding and fixing, the anchor bars of each pier are welded and fixed to the main bars of the existing structural columns one by one, so that the anchor bars of each pier can form lantern bars with the main bars of the existing structural columns; 2.3. Arrange horizontally closed stirrups on the outside of the welded part of the anchor bar of the pier and the main bar of the existing structural column, so that the horizontal closed stirrup tightens the welded part of the anchor bar of the pier and the main bar of the existing structural column; 2.4. Set up the main reinforcement of the upper pier: Arrange the main reinforcement of the upper pier in the three directions of X, Y, and Z within the range of the lantern reinforcement. The main reinforcement adopts the shape of a stirrup, and the original load-bearing frame column concrete column is enclosed to form a reinforcement cage; 2.5. The lower surface of the upper pier is arranged with an upper embedded plate and plate anchor bars; 2.6. According to the normal construction requirements, pour the concrete layer to form the upper pier. 3. The construction process for seismic isolation and strengthening of existing buildings according to claim 2, wherein the anchoring bars of the pier are in the form of shape settings; the The two welded ends of the C-shaped anchor bar are formed by bending the two ends of the C-shaped steel bar inwards respectively. 4. The construction process for seismic isolation and strengthening of existing buildings according to claim 3, characterized in that the horizontal closed stirrups are arranged at the same The bending position adjacent to the welded end of the shaped anchoring tendon. 5. The existing building seismic isolation reinforcement construction process according to claim 2, characterized in that, said pier anchor bars include column edge anchor bars and column corner anchor bars; column edge anchor bars are perpendicular to existing structural columns There are two ways to arrange the anchor bars at the corner of the column, one of which is arranged along the diagonal direction of the existing structural column. The reinforcements are arranged in one-to-one correspondence with the main reinforcements of the existing structural columns; in another arrangement, the anchoring reinforcements at the corners of the columns include two, each perpendicular to the adjacent two sides of the existing structural columns. 6. The construction process of seismic isolation and reinforcement of an existing building according to claim 1, characterized in that, the pillar adopts the whole steel pipe column or steel pipe concrete column. 7. The construction process for seismic isolation and reinforcement of an existing building according to claim 1, characterized in that, in step (5), the bolt locking member is a locking bolt or a threaded sleeve. 8. The construction process for seismic isolation and strengthening of existing buildings according to claim 1, wherein the upper and lower pre-embedded panels are rectangular, square or circular; and the upper and lower pre-embedded panels are rectangular or square, one or more groups of plate anchoring ribs are arranged at the middle of each plate edge of the embedded plate. 9. The construction process for seismic isolation and strengthening of existing buildings according to claim 1, characterized in that the cutting of the structural column in step (4) is carried out using a rhinestone cutting method, comprising the following steps: 4.1. Drill a row of holes on the bottom of the upper pier, and re-drill the raised part to form a cutting surface; 4.2. Drill a row of holes on the top surface of the lower pier, and re-drill the raised part to form a cutting surface; 4.3 When cutting, the steel bars and concrete of the structural column shall be cut together. 10. The construction process for seismic isolation and strengthening of existing buildings according to claim 1, characterized in that, after pouring the grouting material mixture described in step (6), there is also a secondary grouting step, specifically: Pressure grouting is used to grout the concrete shrinkage cracks between the upper connection plate of the support and the upper pier, and between the lower connection plate of the support and the lower pier, so as to ensure the The filling between them is dense.