Reinforcing and reinforcing method for forming round hole in rear portion of reinforced concrete wall

Abstract

The invention discloses a reinforcing and reinforcing method for forming a round hole in the rear portion of a reinforced concrete wall. The reinforcing and reinforcing method comprises the following steps of (1) paying off and positioning on the wall, (2) forming the round hole in the rear portion of the wall, (3) conducting static trepanning, (4) cutting edges and corners, (5) repairing the periphery of the hole, (6) reinforcing and reinforcing the periphery of the hole, and (7) brushing a reinforcing and reinforcing area protection layer. The mode of firstly punching and then reinforcing is adopted, after static punching is conducted on a wall, A-level structure sticky steel glue is adopted to adhere a reinforcing steel plate, a U-shaped steel hoop plate and a steel plate pressing strip on the periphery of the hole, a post-planted M12 chemical anchor bolt is adopted to tighten the steel plate and compact the structural glue, and wall body steel bar cut-off and steel bar section loss caused by post punching are reinforced; stress concentration formed by post-holing is resisted, so that the safety of the reinforced concrete wall after holing is effectively ensured, and the method is convenient in material processing, simple in construction, high in construction speed and high in quality reliability.

Description

Technical Field

[0001] The invention relates to the technical field of building reinforcement construction, in particular to a method for reinforcing a reinforced concrete wall by post-drilling a circular hole. Background Art

[0002] Reinforced concrete walls are widely used in various building structures, such as frame-shear structures, shear wall structures, tube structures, basement exterior walls, and civil air defense walls. They possess strong vertical and horizontal load-bearing capacity and high lateral stiffness, making them the primary structural component for carrying vertical loads and resisting seismic forces. In new construction, due to management oversight and irregular construction practices, pre-installed holes in reinforced concrete walls are often omitted during construction, necessitating later additions. In the renovation and renovation of existing buildings, later additions are often necessary for pipeline installation and layout adjustments. These later additions inevitably interrupt the existing horizontal and vertical reinforcement within the wall. Without reliable reinforcement, this poses a safety hazard to the building's load-bearing capacity and seismic resistance. The commonly used reinforcement method, using angle steel, has drawbacks for circular openings, such as complex material processing, cumbersome construction, and difficulty ensuring quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for reinforcing a reinforced concrete wall by post-drilling a circular hole, so as to solve the problems existing in the prior art.

[0004] The technical solution of the present invention is a method for reinforcing a reinforced concrete wall by opening a circular hole thereafter, comprising the following steps:

[0005] Step 1: Lay out the lines on the wall and locate the circular hole according to the location and diameter required by the construction.

[0006] Step 2: Drilling a circular hole in the wall. Drilling a circular hole in the reinforced concrete wall after forming. During construction, the wall strength needs to be tested. The wall strength needs to be maintained at not less than 75% of the design strength when not bearing load and not less than 100% of the design strength when bearing load before drilling the hole.

[0007] Step 3: Static drilling: Use a drilling machine to statically drill holes in the inner side of the drilling range along the circumference direction.

[0008] Step 4: Cutting corners: Use a chisel to level the protruding corners left around the hole after opening, and use a cutting machine to remove the steel bars inside the corners;

[0009] Step 5: Repair the hole circumference with epoxy high-strength structural repair mortar to repair and level the hole circumference while protecting the cut steel bar ends.

[0010] Step 6: Strengthen the perimeter of the opening by using structural steel adhesive to stick reinforcing steel plates, U-shaped steel hoops and steel plate battens. Stick reinforcing steel plates and U-shaped steel hoops on both sides of the opening, and finally stick steel plate battens on the ends of the reinforcing steel plates and U-shaped steel hoops.

[0011] Step seven: Apply a protective layer to the reinforced area. After the steel plates are pasted, apply anti-rust paint and fire retardant paint to the surface of the steel plates for protection.

[0012] Furthermore, in the step 1, the line positioning diameter is 50 mm larger than the designed diameter of the hole.

[0013] Furthermore, in step three, the hole-drilling machine is an A80mm~100mm water-grinding drill, and the front and rear holes overlap by 10mm when drilling. When the diameter of the rear circular hole is not less than 600mm, an additional hole is added along the diameter position in the same manner; when the diameter of the rear circular hole is not less than 1000mm, two mutually perpendicular holes are added along the diameter position in the same manner.

[0014] Furthermore, the thickness of the epoxy high-strength structural repair mortar is 15 mm.

[0015] Furthermore, during the process of pasting the steel plates, post-planted M12 chemical anchor bolts are used to tighten the steel plates and structural adhesive is used to squeeze the steel plates tightly to ensure that the steel plates and the wall body fit tightly.

[0016] Compared with existing technologies, this invention offers the following advantages: It utilizes a drill-before-reinforcement approach. After statically drilling a hole in the wall, A-grade structural adhesive is used to adhere reinforcing steel plates, U-shaped steel hoops, and steel plate strips around the opening. Post-installed M12 chemical anchors are used to tighten the steel plates and compact the structural adhesive. This method compensates for wall reinforcement truncation and cross-sectional loss caused by post-drilling, counteracts stress concentration caused by post-drilling, and effectively ensures the safety of the reinforced concrete wall after the hole is drilled. This method facilitates material processing, offers simple and efficient construction, and offers high quality reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a construction flow chart of the present invention;

[0018] Figure 2 This is a schematic diagram of the facade reinforcement of the steel plate at the edge of the circular hole opened on the wall in the present invention;

[0019] Figure 3 This is a table for selecting steel plates for reinforcing the circular holes in the reinforced concrete wall according to the present invention.

[0020] In the figure, 1-horizontal reinforcement steel plate at the edge of the hole; 2-vertical reinforcement steel plate at the edge of the hole; 3-horizontal U-shaped steel hoop plate; 4-vertical U-shaped steel hoop plate; 5-oblique U-shaped steel hoop plate; 6-steel plate pressure strip; 7-M12 chemical anchor bolt; 901-concrete wall; 902-rear opening. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] See Figure 1-3 In the present invention, a method for reinforcing a post-drilled circular hole in a reinforced concrete wall includes the following steps: first, positioning the wall according to the position and diameter of the circular hole required for construction, wherein the positioning diameter is larger than the designed hole diameter, and is preferably positioned according to (designed hole diameter + 50 mm). Since the hole is drilled later, the hole position should be pre-designed and reviewed to avoid hidden columns and beams in the wall. The hole diameter should not be larger than 1 / 4 of the total wall width, and the hole diameter should not be arbitrarily increased.

[0025] Step 2: Drilling a circular hole in the wall. Drilling a circular hole in the reinforced concrete wall after forming. During construction, the wall strength needs to be tested. The wall strength needs to be maintained at not less than 75% of the design strength when not bearing load and not less than 100% of the design strength when bearing load before drilling the hole. This prevents the drilling operation from damaging the concrete quality or endangering the safety of the main structure.

[0026] Step 3: Static drilling: Static drilling is carried out in sequence along the perimeter of the inner side of the drilling range using a drilling machine. The drilling machine is an A80mm~100mm water-grinding drill or other static drilling machine. The front and rear holes overlap by 10mm during drilling. To ensure construction safety and smooth removal of wall slag in the hole, when the diameter of the rear circular hole is not less than 600mm, an additional hole is added along the diameter in the same way. When the diameter of the rear circular hole is not less than 1000mm, two mutually perpendicular holes are added along the diameter in the same way.

[0027] Step 4: Cutting corners: Use a chisel to level the protruding corners left around the hole after the hole is opened. Use a cutting machine to remove the steel bars inside the corners. During actual construction, a small handheld chisel is used for easy operation.

[0028] Step 5: Repair the hole perimeter using epoxy high-strength structural repair mortar. This will smooth the hole perimeter and protect the cut rebar ends. The epoxy high-strength structural repair mortar is 15mm thick. Epoxy high-strength structural repair mortar is a high-performance material specifically designed for repairing and reinforcing concrete structures. It is made from a fine blend of high-quality raw materials, including epoxy resin, curing agent, and filler. This type of mortar offers excellent properties, including high strength, high adhesion, and high abrasion resistance.

[0029] Step six, reinforce the area around the opening by using structural steel adhesive to stick reinforcing steel plates, as well as U-shaped steel hoops and steel plate strips. Use Class A structural steel adhesive to stick horizontal reinforcing steel plates 1 on both sides of the upper and lower sides of the opening, stick vertical reinforcing steel plates 2 on both sides of the left and right sides of the opening, then stick horizontal U-shaped steel hoops 3 on both sides of the opening, and stick vertical U-shaped steel hoops 4 on both sides of the opening; when the opening size is greater than 800mm, it is also necessary to stick oblique U-shaped steel hoops 5 on the 45-degree and 135-degree axes; finally, stick steel plate strips 6 on the ends of the reinforcing steel plates and U-shaped steel hoops. The specifications of the reinforcing steel plates are based on the size of the opening, refer to Figure 3 The "Selection Table of Steel Plates for Reinforcement of Circular Holes in Rear Openings in Reinforced Concrete Walls" should be used. If the width of the reinforcing steel plate is greater than 100mm, it should be evenly cut into multiple steel plates with similar widths but less than or equal to 100mm.

[0030] In addition, for the areas on both sides of the wall where the steel plates are to be attached, first brush off any surface grease, dirt, and paint, then rinse with cold water. Then, use an angle grinder to grind the bonding surface, remove the carbonized layer, and use compressed air or clean water to remove any scum and dust. After it is completely dry, wipe the surface with acetone-soaked cotton wool. The bonding surface of the steel plates needs to be derusted and roughened. The rougher the grinding, the better. The grinding lines should be perpendicular to the direction of force applied to the steel plates. Furthermore, a Class A structural adhesive, such as modified epoxy resin structural adhesive, is used. Modified epoxy resin structural adhesive is a common Class A structural adhesive suitable for applications such as coating and attaching steel plates to reinforce reinforced concrete components. Modified epoxy resin structural adhesive improves the toughness and impact resistance of the adhesive through modification technology, resulting in high strength, high adhesion, good durability, good heat resistance, strong acid and alkali resistance, good antioxidant and aging resistance, and strong vibration resistance. Depending on the curing conditions, it can be divided into room temperature curing type, low temperature curing type and humid environment curing type. Among them, the most commonly used is room temperature curing structural adhesive.

[0031] Step seven: Apply a protective layer to the reinforced area. After the steel plates are pasted, apply anti-rust paint and fire retardant paint to the surface of the steel plates for protection.

[0032] Specifically, during the process of pasting the steel plates, post-planted M12 chemical anchor bolts 7 are used to tighten the steel plates and structural adhesive is used to squeeze the steel plates to ensure that the steel plates and the wall are tightly fitted. All steel plates are made of Q235B grade steel.

[0033] In addition to the above-mentioned preferred embodiments, the present invention has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A method for reinforcing reinforced concrete walls by opening circular holes later, characterized in that: The following steps are involved: Step 1: Lay out the lines on the wall and locate the circular hole according to the location and diameter required by the construction. Step 2: Drilling a circular hole in the wall. Drilling a circular hole in the reinforced concrete wall after forming. During construction, the wall strength needs to be tested. The wall strength needs to be maintained at not less than 75% of the design strength when not bearing load and not less than 100% of the design strength when bearing load before drilling the hole. Step 3: Static drilling: Use a drilling machine to statically drill holes in the inner side of the drilling range along the circumference direction. Step 4: Cutting corners: Use a chisel to level the protruding corners left around the hole after opening, and use a cutting machine to remove the steel bars inside the corners; Step 5: Repair the hole circumference with epoxy high-strength structural repair mortar to repair and level the hole circumference while protecting the cut steel bar ends. Step 6: Strengthen the perimeter of the opening by using structural steel adhesive to stick reinforcing steel plates, U-shaped steel hoops and steel plate battens. Stick reinforcing steel plates and U-shaped steel hoops on both sides of the opening, and finally stick steel plate battens on the ends of the reinforcing steel plates and U-shaped steel hoops. Step seven: Apply a protective layer to the reinforced area. After the steel plates are pasted, apply anti-rust paint and fire retardant paint to the surface of the steel plates for protection.

2. The method for reinforcing a reinforced concrete wall by opening a circular hole thereafter according to claim 1, characterized in that: In the step 1, the line positioning diameter is 50 mm larger than the designed diameter of the hole.

3. The method for reinforcing a reinforced concrete wall by opening a circular hole thereafter according to claim 1, characterized in that: In the step three, the hole-drilling machine is an A80mm~100mm water-grinding drill. When drilling, the front and rear holes overlap by 10mm. When the diameter of the rear circular hole is not less than 600mm, an additional hole is added along the diameter position in the same way; when the diameter of the rear circular hole is not less than 1000mm, two mutually perpendicular holes are added along the diameter position in the same way.

4. The method for reinforcing a reinforced concrete wall by subsequently opening a circular hole according to claim 1, characterized in that: In the step 5, the thickness of the epoxy high-strength structural repair mortar is 15 mm.

5. The method for reinforcing a reinforced concrete wall by opening a circular hole thereafter according to claim 1, characterized in that: In step six, during the process of pasting the steel plates, post-planted M12 chemical anchor bolts are used to tighten the steel plates and structural adhesive is used to squeeze the steel plates tightly to ensure that the steel plates and the wall are in close contact.

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