Reinforcing and repairing method for building terrace

Abstract

The invention discloses a reinforcing and repairing method for a building terrace. Certain pressure can be applied to the rigid floor layer by implanting the expansion screws, gaps can be filled in combination with grouting, connection between the floor and the structural layer is enhanced, the anti-pulling capacity and the overall stability of the floor are improved, and it is ensured that the structural layer and the floor layer can be firmly combined. According to the steps, the overall stability of the terrace can be effectively improved, the hollowing phenomenon of the rigid layer is prevented, the binding force and shear resistance between the rigid layer and the structure can be enhanced, the durability and safety of the terrace are improved, and the problem occurring again in the later period is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically, to a method for reinforcing and repairing a building floor. Background Art

[0002] As a common quality problem in construction, hollowing and cracking of basement floors are very common and occur frequently. This is because the bonding force between the structural layer and the floor (leveling layer) is very weak (the specification requires the plaster layer to be 0.3Mpa); the shear resistance between the floor and the structural layer is also weak; and the tensile strength of the concrete itself is not strong. After the construction is completed and the floor concrete is solidified, under the combined effects of shrinkage, creep, thermal expansion and contraction, the floor is prone to large-scale hollowing and cracking. Especially the garage floor, affected by the driving of the vehicle (acceleration, braking), the floor is repeatedly pulled, and the hollowing and cracking are more serious. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and provides a method for reinforcing and repairing a building floor, in the hope of solving the problem that large-area hollowing and cracking are very likely to occur in the floor in the prior art.

[0004] In order to solve the above technical problems, one embodiment of the present invention adopts the following technical solution:

[0005] A method for reinforcing and repairing a building floor comprises the following steps:

[0006] S1: Drilling positioning, drilling evenly in cracks or hollow areas;

[0007] S2: Drill further holes in the already formed space, and the drilling depth should exceed the bottom of the floor;

[0008] S3: Inject repair material into the drilled hole to ensure that the hollow area is fully filled;

[0009] S4: Select an expansion tube with a length equal to the depth of the drill hole in the floor, put the expansion tube into the drill hole, and use a tool to push the expansion tube to the bottom of the hole to ensure that it is in close contact with the floor;

[0010] S5: Install the expansion screw in the expansion tube and tighten the expansion screw.

[0011] By implanting expansion screws, a certain amount of pressure can be applied to the floor, and combined with grouting, the gaps can be filled, the connection between the floor and the structural layer can be strengthened, and its pull-out resistance and overall stability can be improved, ensuring that the structural layer and the floor can be firmly bonded. The above steps can not only effectively improve the overall stability of the floor and prevent the floor from hollowing, but also enhance the bonding force and shear resistance between the floor and the structure, improve the durability and safety of the floor, and avoid problems in the future.

[0012] A further technical solution is to perform the following steps before executing S1:

[0013] Determine the hollow area and draw the border with a stone pencil;

[0014] Determine the drilling plan and mark the drilling locations.

[0015] A further technical solution is that the drilling position is specifically, in the crack area, at a left-right symmetrical position within a distance of 20-80 mm from the left and right range of the crack, and the drilling position is marked every 100 mm to 300 mm along the crack direction;

[0016] In the hollow area, mark the drilling positions in a plum blossom shape at intervals of 100mm-300mm.

[0017] Setting appropriate intervals and drilling evenly can ensure comprehensive repair of cracked and hollow areas.

[0018] A further technical solution is to perform the following steps after executing S2 and before executing S3:

[0019] The top of the drill hole is enlarged, and the size of the enlarged hole matches the size of the expansion screw washer and nut, so that after the washer and nut are installed, they are level with the ground without protrusions.

[0020] In order to keep the repaired floor flat and avoid drilling too large, the present invention expands the top of the drilled hole so that the expansion screw washer and nut can be placed. After the expansion screw is installed, the floor can still be kept flat without the need for later cutting and grinding.

[0021] A further technical solution is that S5 specifically comprises installing a disc washer and a flat washer on the expansion screw, and tightening the expansion screw in the expansion tube until the disc washer is flattened.

[0022] When the disc washer is flattened, it can provide elastic force, increase the friction between the nut, disc washer and flat washer, and further improve the pull-out and shear resistance between the structural layer and the floor.

[0023] A further technical solution is that the repair material is one of epoxy resin, road repair material and grouting material.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects: by implanting expansion screws, the present invention can exert a certain pressure on the floor, and combined with grouting, it can fill the gap, strengthen the connection between the floor and the structural layer, and improve its pull-out resistance and overall stability, ensuring that the structural layer and the floor can be firmly combined. The above steps can not only effectively improve the overall stability of the floor and prevent the floor from hollowing, but also enhance the bonding force and shear resistance between the floor and the structure, improve the durability and safety of the floor, and avoid problems in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the operation flow of an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of crack drilling;

[0027] Figure 3 This is a schematic diagram of drilling holes in the hollow area;

[0028] Figure 4 This is a cross-sectional view of the area after restoration;

[0029] Figure 5 It is a schematic diagram of the assembly of screws, disc washers and flat washers;

[0030] Figure 6 This is a schematic diagram of the installation of screws, disc washers, and flat washers.

[0031] In the figure, 1-metal expansion tube, 2-expansion screw, 3-disc washer, 4-flat washer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] A method for reinforcing and repairing a building floor, see Figure 1 , including the following steps:

[0034] S1: Determine the hollow area and draw the boundary with a stone pencil;

[0035] In this embodiment, the hollow area is determined by visual inspection, and the visual inspection observes the flatness and color changes of the ground. The hollow area usually has cracks;

[0036] You can also use the percussion method based on the visual inspection method. Use a small hammer or a wooden stick to gently tap the wall or the ground and listen to the changes in the sound. The sound emitted by the normal area is dull, while the hollow area will emit a crisp or hollow sound. In this way, you can check and mark the specific location of the hollow block by block.

[0037] S2: Determine the drilling plan and mark the drilling locations.

[0038] Since the damage range of cracks and hollow areas is different, the locations that need to be drilled for repair are also different. Therefore, a more suitable drilling location plan can be further adopted for different damages. Among them, the determination of the hole spacing also needs to be determined based on the fluidity (viscosity) of the slurry and the filling effect of the slurry; the lower the viscosity, the better the fluidity, and the larger the hole spacing, which can be determined on-site by proofing.

[0039] In this embodiment, the marking drilling position is specifically:

[0040] In the crack area, see Figure 2 , mark the drilling position at a symmetrical position within a distance of 20-80mm from the left and right sides of the crack, and mark the drilling position every 100mm-300mm along the crack direction. Specifically, mark the drilling position at a symmetrical position 50mm from the left and right sides of the crack, and mark the drilling position every 200mm along the crack direction.

[0041] In the hollow area, mark the drilling positions in a plum blossom shape at intervals of 100mm-300mm. Specifically, mark the drilling positions at intervals of 200mm.

[0042] S3: Drilling positioning: according to the drilling positions marked in S2, use an impact drill to drill holes evenly in the crack or hollow area;

[0043] S4: Drill further holes in the formed space, and the drilling depth should exceed the bottom of the floor;

[0044] Since the expansion screws need to be placed in the structural layer, the drilling length = floor thickness + length of metal expansion tube 1;

[0045] The structural layer can be a base plate or a raft plate depending on the specific situation.

[0046] It should be noted that the material of the expansion tube can be selected according to demand. In this embodiment, the expansion tube is a metal expansion tube.

[0047] In this embodiment, the hole diameter is set to Φ6 mm, and the depth should just reach the bottom of the floor plus 40 mm (the length of the metal expansion tube 1).

[0048] S5: Expand the top of the drill hole. The size of the expanded hole matches the size of the expansion screw washer and nut to be installed later, so that the washer and nut are level with the ground without protrusions after installation.

[0049] In this embodiment, the expansion hole size is Φ16 mm, and the depth is between 10 mm and 15 mm.

[0050] S6: Clean the residue in the borehole;

[0051] Use a special brush and a hair dryer to clean the hole. First, blow out the dust in the hole to ensure that there is no dust or debris in the hole. Then use the brush to pull and roll in the hole to physically remove the residue on the hole wall.

[0052] S7: Inject repair material into the drilled holes to ensure that the hollow area is fully filled;

[0053] The repair material is one of epoxy resin, road repair material and grouting material. In this embodiment, polymer grouting material is used.

[0054] S8: Select a metal expansion tube 1 with a length equal to the depth of the drill hole in the floor, put the metal expansion tube 1 into the drill hole, and use a tool to push the metal expansion tube 1 to the bottom of the hole to ensure that it is in close contact with the floor;

[0055] In this embodiment, a metal expansion tube 1 having a length of 40 mm is used and the size matches the screw 2 .

[0056] S9: Install the expansion screw 2 in the metal expansion tube 1 and tighten the expansion screw 2.

[0057] In this embodiment, the expansion screw 2 is installed by putting a disc washer 3 and a flat washer 4 on the expansion screw, and tightening the expansion screw 2 in the metal expansion tube 1 until the disc washer 3 is flattened.

[0058] Since the floor thickness is about 50mm, 304 stainless steel Φ3.5mm screw 2 is selected, and the length of screw 2 is 70-90mm;

[0059] The size, quantity and overlapping method of butterfly washers can be adjusted according to needs. The options include overlapping, matching and mixed.

[0060] In this embodiment, the specific scheme of assembling the disc washer 3 and the flat washer 4 is to select a disc washer 12.5*6.2*0.7 (G / T1972.DIN2093 disc spring washer) + a flat washer M4*14*1.0. The structure after assembly is shown in FIG. Figure 5 After tightening the expansion screw 2, the disc washer 3 is flattened, and the structure is as follows Figure 6 As shown;

[0061] This type of disc washer can provide an elastic force of 660N when f=0.75h. To ensure that at least 660N of elastic force can be generated when tightening the screws, the torque of the torque screwdriver should be set to 1.2N·m.

[0062] The reinforcement and repair effect is calculated below. Expansion screws 2 are arranged at intervals of 200mm in the hollow area, with 25 per square meter. Based on the effective cross-section of screw 2 of 2.7mm, the designed tensile strength of 304 material is 205Pa (based on deformation of 0.2%), and the shear strength is 505Pa.

[0063] Pull-out resistance per square meter = (2.7 2 *3.14 / 4)*205*25=29328N (2.9 tons);

[0064] Shear resistance per square meter = (2.7 2 *3.14 / 4)*505*25=72248N (7.2 tons);

[0065] After calculation, this method can provide an additional pull-out resistance of 2.9 tons and shear resistance of 7.2 tons per square meter (without considering the pull-out and shear resistance of the concrete bonding layer), which greatly ensures the stability of the floor during use and ensures that there is no hollowing or cracking.

[0066] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in the present application. More specifically, within the scope disclosed in the present application, multiple variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A method for reinforcing and repairing a building floor, characterized in that: The following steps are involved: S1: Drilling positioning, drilling evenly in cracks or hollow areas; S2: Drill further holes in the formed space, and the drilling depth should exceed the bottom of the floor; S3: Inject repair material into the drilled hole to ensure that the hollow area is fully filled; S4: Select an expansion tube with a length equal to the depth of the drill hole in the floor, put the expansion tube into the drill hole, and use a tool to push the expansion tube to the bottom of the hole to ensure that it is in close contact with the floor; S5: Install the expansion screw in the expansion tube and tighten the expansion screw.

2. A method for reinforcing and repairing a building floor as claimed in claim 1, characterized in that: Perform the following steps before executing S1: Determine the hollow area and draw the border with a stone pencil; Determine the drilling plan and mark the drilling locations.

3. A method for reinforcing and repairing a building floor as claimed in claim 2, characterized in that: Specifically, the drilling position is marked at a left-right symmetrical position within a distance of 20-80 mm from the left and right range of the crack in the crack area, and the drilling position is marked every 100 mm to 300 mm along the crack direction; In the hollow area, mark the drilling positions in a plum blossom shape at intervals of 100mm-300mm.

4. A method for reinforcing and repairing a building floor as claimed in claim 1, characterized in that: After executing S2 and before executing S3, perform the following steps: The top of the drill hole is enlarged, and the size of the enlarged hole matches the size of the expansion screw washer and nut, so that after the washer and nut are installed, they are level with the ground without protrusions.

5. A method for reinforcing and repairing a building floor as claimed in claim 1, characterized in that: Specifically, S5 includes installing a disc washer and a flat washer on the expansion screw, and tightening the expansion screw in the expansion tube until the disc washer is flattened.

6. A method for reinforcing and repairing a building floor as claimed in claim 1, characterized in that: The repair material is one of epoxy resin, road repair material and grouting material.

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