CN116044204A - A Concrete Floor Reinforcement Method with Seriously Corroded Steel Bars - Google Patents

Abstract

A concrete floor reinforcement method with severely corroded steel bars, including unloading the slab to be reinforced; chiseling off the plaster layer and protective layer at the bottom of the slab to be reinforced, removing the corrosion layer of the steel bars in the slab, and brushing with rust inhibitors; implanting newly added floor slab steel bars on the beams ; Valve holes are opened at the bottom of the template, and pouring valves are installed; the template is supported, and a vertical support mechanism including a liftable threaded rod is installed at the lower part of the template; an infrared measuring ruler is arranged to monitor the displacement and deformation of the bottom of the template; the grouting pipe is connected through the valve, Connect the grouting material pipe to the pressurized pump, pour the grouting material to the design thickness, close the valve, and remove the grouting material pipe; after the initial setting of the grouting material, adjust the screw to make the template move up synchronously; after the grouting material reaches the design age Remove the vertical support mechanism; level the grouting material from the grouting valve to the bottom of the slab. The reinforcement method does not need to dismantle the decoration layer on the upper part of the floor slab, and has the advantages of short construction period, quick effect, simple construction technology, little impact on the original reinforced concrete slab, environmental protection, economy and applicability.

Description

A Concrete Floor Reinforcement Method with Severely Corroded Steel Bars

technical field

The invention belongs to the technical field of building reinforcement, and in particular relates to a method for reinforcing a concrete floor with severely corroded steel bars.

Background technique

For the purpose of renovation or the reason that the building structure has reached the design service life, it is often necessary to strengthen the building structure. In various projects of structural reinforcement, due to long service life, corrosive ions contained in concrete materials, non-standard construction methods or unreasonable structural design, reinforced concrete floors often suffer from concrete cracking at the bottom of the slab and corrosion of steel bars. Corrosion of the steel bars on the floor will also lead to a decrease in the bonding strength between the steel bars and the floor, so that the tensile strength of the steel bars cannot be effectively transmitted to the floor. The large-volume corrosion products produced by the corrosion of steel bars will accumulate in the concrete and steel bars of the floor, leading to the gradual increase of the extrusion stress of the concrete and accelerating the cracking of the floor, which will gradually affect the normal use of the floor. Corrosion of steel bars will lead to a decrease in the durability and bearing capacity of reinforced concrete slabs, resulting in damage to reinforced concrete slabs. Therefore, the reinforcement of the bottom of the floor slab and the treatment of the steel bars at the bottom of the slab are problems that need to be solved urgently.

At present, the reinforcement methods of reinforced concrete slabs mainly include the method of enlarging the cross-section, the method of pasting carbon fiber or steel plate, the method of adding steel beam support at the bottom of the slab, and the method of adding floor support. However, the method of enlarging the cross-section needs to change the layout of the upper part of the original floor slab or open holes in the floor slab. The reinforcement method of pasting carbon fiber or steel plate is not suitable for the case where the original floor slab has been used for a long time or the depth of carbonization is deep. Add steel beams at the bottom of the slab The support and reinforcement method and the method of adding floor support may cause cracks on the floor surface. The common reinforcement method of increasing the thickness of the floor on the upper part of the floor needs to remove the original floor bricks and redecorate, which takes a long construction period, which will affect the normal use and increase the economic investment. Therefore, there is an urgent need for a reinforced concrete slab reinforcement method with short construction period, quick results, simple construction technology, and wide application range. Concrete cracking caused by various factors, and the damage caused by the corrosion of the concrete reinforcement at the bottom of the slab, which leads to the decrease of the durability and bearing capacity of the slab, are dealt with in order to achieve simple, efficient, environmentally friendly and economical reinforcement.

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a concrete floor reinforcement method with severely corroded steel bars. The bearing capacity of corroded concrete slabs has short construction period, quick results and simple construction technology, which can effectively solve the problems of cracking at the bottom of reinforced concrete slabs and corrosion of steel bars, enhance the durability and bearing capacity of reinforced concrete slabs, and save decoration costs at the same time , It can realize the simple, efficient, environmental protection and economical repair of the concrete floor slab with corroded steel bars.

In order to achieve the above object, the present invention provides a concrete floor reinforcement method with severely corroded steel bars, which specifically includes the following steps;

Step 1: unload the reinforcement plate to be reinforced;

Remove all the loads above the plate to be strengthened to reduce the load on the plate to be strengthened;

Step 2: Chisel off the plaster layer and protective layer at the bottom of the board to be reinforced, and derust the steel bars of the board to be reinforced;

S21: Divide the plate to be strengthened into multiple sections along the length direction, and support a set of vertical steel pipes under each section, wherein the top of the vertical steel pipe is offset against the lower end surface of the plate to be strengthened through the upper backing plate connected, so that the lower end of the vertical steel pipe abuts against the floor below the plate to be reinforced through the lower backing plate;

S22: Carry out chiseling operations on multiple sections one by one starting from one end;

First remove a group of vertical steel pipes in the working section, and then use tools to chisel off the plaster layer and protective layer at the bottom of the slab to be reinforced in this section, so that the steel bars of the slab to be reinforced at the bottom of the slab to be reinforced in this section are exposed Outside, and then follow this method to chisel the next operation section until all sections are processed, and ensure that the steel bars of the plate to be reinforced at the lower part of the plate to be strengthened are all exposed;

S23: Derusting the exposed steel bars to be reinforced;

According to the corrosion situation, derust the exposed steel bars to be reinforced. Remove the heavily corroded steel bars to be reinforced, replace them with new steel bars of the same specification, and make fixed connections with the original steel mesh. For lightly corroded steel bars Remove the rust layer on the surface of the steel bar to be strengthened and apply rust inhibitor;

Step 3: Binding reinforcement plate reinforcement;

Bind the reinforcing steel bars of the newly added floor under the bottom of the slab to be reinforced, and connect the reinforcing steel bars with the exposed reinforcing steel bars. Steel bars enhance the bearing capacity of the board to be reinforced;

Step 4: Open a hole at the bottom of the formwork of the reinforced plate, and install the pouring valve of the grouting material;

First use tools to open holes on the reinforced plate formwork according to the size of the grouting material pouring valve, and then install the grouting material pouring valve on the hole;

Step 5: Support the formwork of the reinforced plate and install the vertical support mechanism;

S51: Install the reinforced plate formwork under the bound reinforced plate reinforcement, and make the reinforced plate formwork 20-25mm below the design height;

S52: Support a plurality of vertical support mechanisms under the reinforced plate formwork, the vertical support mechanisms are composed of backing plate 1, liftable screw, connecting piece, steel pillar and backing plate 2 distributed sequentially from top to bottom, Among them, the lower end of the steel pillar abuts against the floor below the plate to be reinforced through the backing plate two, the upper end of the steel pillar is fixedly connected with the lower end of the liftable screw through the connector, and the upper end of the liftable screw is connected to the reinforced plate formwork through the backing plate one. The lower end faces are in contact with each other;

Step 6: Arrange the infrared measuring ruler to monitor the height of the reinforced plate template;

Take the central point at the bottom of the reinforced plate template and the middle point of the four sides of the reinforced plate template as the measuring points, and fix the infrared measuring ruler directly below each measuring point, so as to use the infrared measuring ruler to record the height data at the bottom of the reinforced plate template;

Step 7: pour the grout through the grout pouring valve;

S71: use the grouting material pipe to establish the connection between the grouting material pouring valve and the booster pump;

S72: first close the grout pouring valve, and then add the grout to the booster pump;

S73: Open the grout pouring valve, start the booster pump, pour the grout above the reinforced plate formwork until the poured grout reaches the designed thickness, then close the grout pouring valve, and remove the grout pipe;

Step 8: Synchronize the template of the reinforced board to move up as a whole;

When the grout poured in step 7 reaches the initial setting time, synchronously adjust the liftable screw on the upper part of the steel pillar, so that the whole reinforced plate formwork is synchronously pushed upwards by 1 to 3mm. The jacking process is divided into multiple times, each time the reinforced plate The jacking distance of the formwork is the same, and the jacking distance is controlled by comparing the value of the infrared measuring ruler. During the jacking process, the overall level of the reinforced plate template is guaranteed;

Step 9: Remove the vertical support mechanism and perform strength testing;

After the grout poured in step 7 is cured to the design age, remove the vertical support mechanism, compare and observe the value of the infrared measuring ruler before and after removal, and restore the vertical support mechanism if there is too much change, and carry out vertical support after the deformation tends to stabilize Removal of the support mechanism, after removing the vertical support mechanism, remove the reinforced plate template and test the strength of the newly poured reinforced plate, if the strength does not meet the requirements, rework step 7, and if the strength meets the requirements, proceed to step ten;

Step 10: Treat the grouting material at the bottom of the board;

Remove the grout from the grout valve to the bottom of the reinforced plate formwork to ensure the flatness of the bottom of the reinforced plate formwork.

In step four, the number of vertical support mechanisms is set according to the load and deformation calculation results.

Further, in order to make the structure of the liftable screw more simple, and at the same time, in order to make its bearing capacity more stable and reliable, in step five, the liftable screw is composed of a support sleeve at the bottom and a support rod at the top, the The upper axis of the support sleeve is provided with an internally threaded hole, and the shaft of the support rod body is provided with an external thread structure, and the lower part of the support rod body is connected to the internally threaded hole of the support sleeve through thread fit, and the upper end of the support rod body is fixed externally. An adjustment block is connected, and the cross section of the adjustment block is a regular polygon.

As a preference, in step 1, it is necessary to ensure that the decoration layer on the upper part of the floor to be reinforced is not damaged during the unloading process.

Further, in order to improve the removal efficiency, the removal operation in step ten is performed with a cutting machine.

In the present invention, all the load above the plate to be reinforced is removed before the chisel operation, which can avoid damage to the plate to be reinforced due to the action of the load during the chisel operation; In the process, the bottom plaster layer and protective layer of the reinforced plate are chiseled off in sections. At the same time, the method of chiseling while supporting and unloading can effectively reduce the impact of the chiseling operation on the reinforced plate, thereby greatly reducing the Damage caused by the upper structure of the plate to be reinforced. When dealing with the exposed reinforcement plate reinforcement, replacing the severely corroded reinforcement can not only effectively increase the load-carrying capacity of the original reinforcement structure, but also effectively improve the bonding ability of the original reinforcement structure and concrete grouting material. Removing the rust layer on the surface of lighter steel bars and applying rust inhibitors can not only avoid subsequent re-corrosion, but also help to improve its bonding ability with subsequent concrete grouting materials. In this way, the rust removal treatment can significantly Improve the overall connection strength of the reinforced floor, so that the tensile strength of the steel bar can be effectively transmitted to the floor, which can greatly improve the bearing capacity of the reinforced floor. Holes are opened on the formwork of the reinforced plate, and the grouting material pouring valve and the booster pump are connected by using the grouting material pipe, which can make the pouring process of the subsequent grouting material more convenient. Supporting the reinforced plate formwork under the bound reinforced plate steel bars, and making it 20-25mm lower than the design height, can ensure that more grouting material can be poured in later, so that the bound reinforced plate steel bars can be covered by the grouting material , The exposed steel bars of the slab to be strengthened and the concrete under the slab to be strengthened are fully connected to effectively improve the overall bonding strength of the slab after reinforcement. The rigid support part of the vertical support mechanism is composed of liftable threaded rods and steel pillars, which can not only ensure the bearing strength, but also enable the vertical support mechanism to have liftability. When the poured grouting material reaches the initial setting time, the reinforcement board formwork is pushed up 1-3mm synchronously, which can relieve the gap caused by floating slurry and bleeding on the top, make the grouting material more solid, and effectively promote the binding The reinforced slab reinforcement, the exposed reinforced slab reinforcement and the concrete at the lower part of the to-be-reinforced slab are better combined into a whole, thereby significantly improving the bearing capacity of the strengthened floor slab. After the grouting material is cured to the design age, the strength test can ensure the reliability of the reinforced floor through more scientific means. This reinforcement method does not need to dismantle the upper decoration layer of the floor slab. Its overall operation period is short, the construction process is simple, the reinforcement effect is good, the effect is quick, the impact on the upper structure of the original reinforced concrete slab is small, and the scope of application is wide. It does not need to consider the old The bearing capacity of reinforced concrete slabs effectively solves the problems of cracking, collapse, excessive deformation or insufficient bearing capacity of reinforced concrete slabs caused by factors such as the expiration of the design service life, limited material properties, irregular construction methods, and unreasonable structural design. , realizing the simple, efficient, economical and safe repair and reinforcement of reinforced concrete slabs.

Description of drawings

Fig. 1 is the plan view of the bottom of the front slab reinforced by the reinforced concrete slab in Zhongyuan of the present invention;

Fig. 2 is the sectional view of A-A direction in Fig. 1;

Fig. 3 is the plane view at the bottom of the slab bottom after the reinforced concrete slab of Zhongyuan of the present invention is reinforced;

Fig. 4 is the sectional view of B-B direction in Fig. 3;

Fig. 5 is a schematic structural view of vertical steel pipes supported under the plate to be reinforced in the present invention;

Fig. 6 is the structural representation of reinforcing plate steel bar binding and reinforcing plate formwork supporting among the present invention;

Fig. 7 is a structural schematic diagram of a vertical support mechanism under the plate to be reinforced in the present invention;

Fig. 8 is the schematic diagram of grouting material pouring process among the present invention;

Fig. 9 is a schematic structural view of the front of the grouting material valve in the present invention;

Fig. 10 is a schematic structural view of the side of the grouting material valve in the present invention;

Fig. 11 is a schematic diagram of the supporting state before the stiffener formwork is pushed in according to the present invention;

Fig. 12 is a schematic diagram of the supporting state after the reinforced plate formwork is jacked in the present invention;

Fig. 13 is a structural schematic diagram of the liftable screw in the present invention.

In the figure: 1. Plate to be reinforced, 2. Steel bar to be strengthened, 3. Reinforced plate steel bar, 4. Formwork for reinforced plate, 5. Beam at plate end, 6. Grouting material pouring valve, 7. Steel pillar, 8. Liftable Screw, 9, connector, 10, backing plate one, 11, infrared measuring ruler, 12, grouting material pipe, 13, booster pump, 14, reinforcing plate, 15, backing plate two, 16, support sleeve, 17, Support bar body, 18, adjusting block, 19, vertical steel pipe, 20, last backing plate, 21, following backing plate.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figures 1 to 13, the present invention provides a concrete floor reinforcement method with severely corroded steel bars, which specifically includes the following steps;

Step 1: unload the reinforcement plate 1 to be treated;

Remove all the loads (such as various furniture, equipment, etc.) above the slab to be reinforced 1 to reduce the load on the slab to be reinforced 1; during the unloading process, ensure that the decoration layer on the upper part of the slab to be reinforced 1 is not damaged .

Step 2: Chisel off the plaster layer and protective layer at the bottom of the board to be reinforced 1, and derust the steel bar 2 of the board to be reinforced;

S21: Divide the plate to be reinforced 1 into multiple sections along the length direction, and support a set of vertical steel pipes 19 under each section, wherein the top of the vertical steel pipes 19 passes through the upper backing plate 20 and the plate to be strengthened The lower end surface of 1 abuts against each other, so that the lower end of the vertical steel pipe 19 abuts against the floor below the plate 1 to be reinforced through the lower backing plate 21;

As a preference, both the upper backing plate 20 and the lower backing plate 21 are wooden backing plates;

S22: Carry out chiseling operations on multiple sections one by one starting from one end;

First remove a group of vertical steel pipes 19 in the operation section, and then use a tool to chisel off the plaster layer and protective layer at the bottom of the plate 1 to be reinforced in this section, so that the bottom of the plate 1 to be reinforced in this section The steel bar 2 of the plate is exposed, and then the next operation section is chiseled according to this method until all sections are processed, and it is ensured that all the steel bars 2 of the plate to be strengthened at the lower part of the plate to be strengthened are exposed;

S23: Derusting the exposed reinforcement 2 of the plate to be reinforced;

According to the corrosion situation, derust the exposed steel bars 2 to be reinforced. Remove the heavily corroded steel bars 2 to be reinforced, replace them with new steel bars of the same specification, and make fixed connections with the original steel mesh. Remove the rust layer on the surface of the light steel bar 2 to be strengthened and apply rust inhibitor;

Step 3: Binding reinforcement plate reinforcement 3;

Under the bottom of the board to be reinforced 1, bind the reinforcing plate reinforcing bar 3 of the newly added floor, and connect the reinforcing plate reinforcing bar 3 with the exposed reinforcing plate reinforcing bar 2, and at the same time, anchor the end of the reinforcing plate reinforcing bar 3 into the beam 5 at the end of the plate In order to utilize the reinforced plate steel bars 3 to enhance the bearing capacity of the plate to be reinforced 1;

Step 4: open a hole at the bottom of the reinforced plate template 4, and install the grouting material pouring valve 6;

First use a tool on the reinforced plate template 4 to open a hole according to the size of the grouting material pouring valve 6, and then install the grouting material pouring valve 6 on the hole;

As a preference, the number of vertical support mechanisms is set according to the load and deformation calculation results.

Step 5: Set up the reinforced plate formwork 4. Install the vertical support mechanism;

S51: Install the reinforced plate formwork 4 under the bound reinforced plate reinforcement bar 3, and make the reinforced plate formwork 4 be located 20-25mm below the design height;

S52: Support a plurality of vertical support mechanisms below the reinforced plate template 4, the vertical support mechanisms are composed of backing plate 10, liftable screw 8, connector 9, steel pillar 7 and The backing plate 2 is composed of 15, wherein, the lower end of the steel pillar 7 abuts against the floor below the plate to be reinforced 1 through the backing plate 15, and the upper end of the steel pillar 7 is fixedly connected with the lower end of the lifting screw 8 through the connecting piece 9, and can be lifted The upper end of the screw 8 abuts against the lower end surface of the reinforcing plate template 4 through the backing plate 10;

As a preference, the lower part of the connecting piece 9 is provided with a threaded hole, and the upper end of the steel pillar 7 is provided with external threads, and the connecting piece 9 is fixedly sleeved on the outside of the upper end of the steel pillar 7 through thread fit.

In order to make the structure of the liftable screw more simple, and at the same time, in order to make its bearing capacity more stable and reliable, the liftable screw 8 is composed of a support sleeve 16 at the bottom and a support rod body 17 at the top. The support sleeve 16 An internally threaded hole is provided at the upper axis of the shaft, and an externally threaded structure is provided on the shaft of the supporting rod body 17, and the lower part of the supporting rod body 17 is connected to the internally threaded hole of the supporting sleeve 16 through thread fit, and the upper end of the supporting rod body 17 is externally An adjustment block 18 is fixedly connected, and the cross section of the adjustment block 18 is a regular polygon. As a preference, the outer section of the connecting piece 9 is a regular polygon, so that when the height of the liftable screw 8 needs to be adjusted, a wrench can be used to fix the connecting piece 9, and another wrench is used to turn the adjusting block 18, thereby The height of the liftable screw rod 8 can be adjusted conveniently.

As a preference, the connector 9, the backing plate one 10 and the backing plate two 15 are all wooden backing plates;

Step 6: Arrange the infrared measuring ruler 11 to monitor the height of the reinforced plate template 4;

Take the central point of the bottom of the reinforced plate template 4 and the middle point of the roots of the four sides of the reinforced plate template 4 as measuring points, and fix the infrared measuring ruler 11 directly below each measuring point, so as to record the bottom of the reinforced plate template 4 with the infrared measuring ruler 11 height data;

Step 7: pour the grout through the grout pouring valve 6;

S71: use the grouting material pipe 12 to establish the connection between the grouting material pouring valve 6 and the booster pump 13;

S72: first close the grouting material pouring valve 6, and then add the grouting material into the booster pump 13;

S73: Open the grout pouring valve 6, start the booster pump 13, pour the grout above the reinforced plate template 4 until the poured grout reaches the designed thickness, then close the grout pouring valve 6, and remove the grout pipe 12; As a preference, the booster pump 13 is removed from the floor below the plate to be reinforced 1;

Step 8: Make the reinforced board template 4 move up as a whole synchronously;

When the grout poured in step 7 reaches the initial setting time, synchronously adjust the lifting screw 8 on the upper part of the steel pillar 7, so that the reinforced plate formwork 4 is jacked up 1-3mm synchronously. The jacking process is divided into multiple times, each The jacking distance of the secondary reinforcing board template 4 is the same, and the jacking distance is controlled by comparing the value of the infrared measuring ruler 11, and the overall level of the reinforcing board template 4 is guaranteed during the jacking process;

Step 9: Remove the vertical support mechanism and perform strength testing;

After the grout poured in step 7 has been cured to the design age, remove the vertical support mechanism. Compare and observe the value of the infrared measuring ruler 11 before and after removal. If there is too much change, restore the vertical support mechanism. To the removal of the support mechanism, after removing the vertical support mechanism, remove the reinforced plate template 4 and detect the strength of the newly poured reinforced plate 14, if the strength does not meet the requirements, then rework step 7, if the strength meets the requirements, then proceed to step ten;

Step 10: Treat the grouting material at the bottom of the board;

Remove the grout from the grout valve 6 to the bottom of the reinforced plate formwork 4 to ensure the flatness of the bottom of the reinforced plate formwork 4 .

As a preference, in order to improve the removal efficiency, a cutting machine is used during the removal operation.

In the present invention, all the load above the plate to be reinforced is removed before the chisel operation, which can avoid damage to the plate to be reinforced due to the action of the load during the chisel operation; In the process, the bottom plaster layer and protective layer of the reinforced plate are chiseled off in sections. At the same time, the method of chiseling while supporting and unloading can effectively reduce the impact of the chiseling operation on the reinforced plate, thereby greatly reducing the Damage caused by the upper structure of the plate to be reinforced. When dealing with the exposed reinforcement plate reinforcement, replacing the severely corroded reinforcement can not only effectively increase the load-carrying capacity of the original reinforcement structure, but also effectively improve the bonding ability of the original reinforcement structure and concrete grouting material. Removing the rust layer on the surface of lighter steel bars and applying rust inhibitors can not only avoid subsequent re-corrosion, but also help to improve its bonding ability with subsequent concrete grouting materials. In this way, the rust removal treatment can significantly Improve the overall connection strength of the reinforced floor, so that the tensile strength of the steel bar can be effectively transmitted to the floor, which can greatly improve the bearing capacity of the reinforced floor. Holes are opened on the formwork of the reinforced plate, and the grouting material pouring valve and the booster pump are connected by using the grouting material pipe, which can make the pouring process of the subsequent grouting material more convenient. Supporting the reinforced plate formwork under the bound reinforced plate steel bars, and making it 20-25mm lower than the design height, can ensure that more grouting material can be poured in later, so that the bound reinforced plate steel bars can be covered by the grouting material , The exposed steel bars of the slab to be reinforced and the concrete at the lower part of the slab to be strengthened are fully connected to effectively improve the overall bonding strength of the slab after reinforcement. The rigid support part of the vertical support mechanism is composed of liftable threaded rods and steel pillars, which can not only ensure the bearing strength, but also enable the vertical support mechanism to have liftability. When the poured grouting material reaches the initial setting time, the reinforcement plate formwork is pushed upwards synchronously by 1-3 mm, which can relieve the gap caused by floating slurry and bleeding on the top, make the grouting material more solid, and effectively promote the binding The reinforced slab reinforcement, the exposed reinforced slab reinforcement and the concrete at the lower part of the to-be-reinforced slab are better combined into a whole, thereby significantly improving the bearing capacity of the strengthened floor slab. After the grouting material is cured to the design age, the strength test can ensure the reliability of the reinforced floor through more scientific means. This reinforcement method does not need to dismantle the upper decoration layer of the floor slab. Its overall operation period is short, the construction process is simple, the reinforcement effect is good, the effect is quick, the impact on the upper structure of the original reinforced concrete slab is small, and the scope of application is wide. It does not need to consider the old The bearing capacity of reinforced concrete slabs effectively solves the problems of cracking, collapse, excessive deformation or insufficient bearing capacity of reinforced concrete slabs caused by factors such as the expiration of the design service life, limited material properties, irregular construction methods, and unreasonable structural design. , to achieve a simple, efficient, economical and safe repair and reinforcement of reinforced concrete slabs.

Claims (5)

1. A concrete floor reinforcement method with severe corrosion of steel bars, is characterized in that, specifically comprises the following steps; Step 1: Unload the reinforcement plate (1); All the loads above the plate to be strengthened (1) are removed to reduce the load of the plate to be strengthened (1); Step 2: Chisel off the bottom plaster layer and protective layer of the plate to be reinforced (1), and carry out derusting treatment on the steel bar (2) of the plate to be reinforced; S21: Divide the plate to be reinforced (1) into multiple sections along the length direction, and support a set of vertical steel pipes (19) under each section, wherein the top of the vertical steel pipes (19) passes through the upper pad The plate (20) abuts against the lower end surface of the plate to be reinforced (1), so that the lower end of the vertical steel pipe (19) abuts against the floor below the plate to be strengthened (1) through the backing plate (21); S22: Carry out chiseling operations on multiple sections one by one starting from one end; First remove one group of vertical steel pipes (19) in the operation section, then use tools to chisel off the plastering layer and protective layer at the bottom of the plate to be reinforced (1) in this section, so that the plate to be reinforced (1) in this section 1) The steel bar (2) of the plate to be strengthened at the bottom is exposed, and then the next operation section is chiseled according to this method until all sections are processed, and the to-be-reinforced plate at the lower part of the plate to be reinforced (1) is ensured. The plate steel bars (2) are all exposed; S23: Derusting the exposed reinforcing steel bar (2) of the plate to be reinforced; According to the corrosion situation, derust the exposed steel bars (2) to be reinforced, and remove the heavily corroded steel bars (2) to be reinforced, replace them with new steel bars of the same specification, and make fixed connections with the original steel mesh , for the lightly corroded steel bar (2) to be strengthened, the rust layer on its surface is removed and rust inhibitor is applied; Step 3: Binding reinforcement plate reinforcement (3); Bind the reinforced plate steel bar (3) of the newly added floor under the bottom of the plate to be reinforced (1), and connect the reinforced plate steel bar (3) with the exposed reinforced plate steel bar (2), at the same time, make the reinforced plate steel bar (3 ) is anchored into the beam (5) at the end of the plate, so as to enhance the bearing capacity of the plate to be reinforced (1) by utilizing the reinforced plate reinforcement (3); Step 4: Hole is opened at the bottom of the reinforced plate template (4), and the grouting material pouring valve (6) is installed; First use tools on the reinforced plate template (4) to open holes according to the size of the grouting material pouring valve (6), and then install the grouting material pouring valve (6) on the hole; Step 5: supporting the reinforced plate formwork (4), installing the vertical support mechanism; S51: Install the reinforced plate formwork (4) under the bound reinforced plate reinforcement bar (3), and make the reinforced plate formwork (4) 20-25mm below the design height; S52: Support a plurality of vertical support mechanisms under the reinforced plate formwork (4), the vertical support mechanisms are composed of a backing plate (10), a liftable screw (8), and a connector that are distributed sequentially from top to bottom (9), steel pillar (7) and backing plate two (15), wherein, the lower end of steel pillar (7) abuts against the floor below the plate to be reinforced (1) through backing plate two (15), and the steel pillar ( The upper end of 7) is fixedly connected with the lower end of the liftable screw rod (8) through the connector (9), and the upper end of the liftable screw rod (8) abuts against the lower end surface of the reinforcing plate template (4) through the backing plate one (10); Step 6: Arrange the infrared measuring ruler (11) to monitor the height of the reinforced plate formwork (4); The central point at the bottom of the reinforced plate template (4) and the middle point of the four sides of the reinforced plate template (4) are used as measuring points, and the infrared measuring ruler (11) is fixedly arranged directly below each measuring point, so as to utilize the infrared measuring ruler ( 11) Record the height data at the bottom of the stiffener template (4); Step 7: pour the grout through the grout pouring valve (6); S71: use the grouting material pipe (12) to establish the connection between the grouting material pouring valve (6) and the booster pump (13); S72: first close the grout pouring valve (6), and then add the grout to the booster pump (13); S73: Open the grout pouring valve (6), start the booster pump (13), pour the grout above the reinforced plate template (4) until the poured grout reaches the designed thickness, then close the grout pouring valve ( 6), take off the grouting material pipe (12); Step 8: Make the stiffener template (4) move up synchronously as a whole; When the grouting material poured in step 7 reaches the initial setting time, synchronously adjust the lifting screw (8) on the upper part of the steel pillar (7) so that the reinforced plate formwork (4) is jacked up by 1-3mm synchronously. For multiple times, the jacking distance of the stiffener template (4) is the same each time, the jacking distance is controlled by comparing the value of the infrared measuring ruler (11), and the overall level of the stiffener template (4) is guaranteed during the jacking process; Step 9: Remove the vertical support mechanism and perform strength testing; After the grout poured in step 7 is cured to the design age, remove the vertical support mechanism, compare and observe the value of the infrared measuring ruler (11) before and after removal, and restore the vertical support mechanism if there is too much change, and wait until the deformation tends to be stable Carry out the removal of the vertical support mechanism. After removing the vertical support mechanism, remove the reinforced plate template (4) and check the strength of the newly poured reinforced plate (14). If the strength does not meet the requirements, rework step 7. If the strength meets the requirements Then proceed to step ten; Step 10: Treat the grouting material at the bottom of the board; Remove the grout from the grout valve (6) to the bottom of the reinforced plate formwork (4) to ensure the flatness of the bottom of the reinforced plate formwork (4). 2. A method for reinforcing concrete floors with severely corroded steel bars according to claim 1, wherein in step 4, the number of vertical support mechanisms is set according to the load and deformation calculation results. 3. A method for reinforcing a concrete floor slab with severely corroded steel bars according to claim 1 or 2, characterized in that, in step 5, the liftable screw (8) consists of a support sleeve (16) located at the bottom and The support rod body (17) that is positioned at the upper part is formed, and the upper shaft center of described support sleeve (16) is provided with internally threaded hole, and the shaft body of support rod body (17) is provided with external thread structure, and the support rod body (17) The lower part is connected in the internally threaded hole of the support sleeve (16) by thread fit, and the upper end of the support rod body (17) is fixedly connected with an adjustment block (18), and the cross section of the adjustment block (18) is a regular polygon. 4. The method for reinforcing a concrete floor with severely corroded steel bars according to claim 3, characterized in that, in step 1, it is necessary to ensure that the decoration layer on the top of the floor to be reinforced (1) is not damaged during the unloading process. 5. The method for reinforcing a concrete floor slab with severely corroded steel bars according to claim 4, characterized in that the cutting operation in step ten is performed by a cutting machine.

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