Construction process for terrazzo floor of underground garage

Abstract

A construction technology for a terrazzo floor of an underground garage comprises the steps that base layer treatment is conducted, specifically, a milling machine is adopted for chiseling, and a concrete chiseling face is washed through a high-pressure water gun; sub-warehouse line snapping and formwork erecting are conducted, specifically, regional formwork erecting construction is conducted, an adhesion agent is evenly poured into the working area of formwork erecting, and then cement is injected to form water paste; concrete is poured in different bins in sequence, the concrete is vibrated, and a cold-drawn steel wire mesh is laid on the surface of the concrete after vibration; color stone spreading: starting to uniformly spread color stones when the concrete is initially set, and fully extracting slurry and finishing the surface after the color stones are spread; the colored stone floor is subjected to line snapping joint cutting, slurry suction is conducted while joint cutting is conducted, and a cotton felt covers the colored stone floor after maintenance; grinding and polishing the colored stone floor, namely grinding and curing the colored stone floor after covering the colored stone floor with the cotton felt for 28 days, and grinding by adopting a dry grinding and water grinding combined manner; according to the underground garage millstone floor construction technology, the delamination phenomenon cannot occur, construction is convenient, wear resistance and compression resistance are achieved, maintenance such as leveling and the like, the hardening period and the stress release period are omitted, and the cost is about 200-260 yuan / m < 2 >.

Description

Technical Field

[0001] This invention relates to the field of underground garage floor construction, and more particularly to a construction process for terrazzo flooring in underground garages. Background Technology

[0002] The underground parking garage floor is a key component of the underground parking lot floor. It not only affects the aesthetics and user experience of the garage, but also needs to have properties such as wear resistance, slip resistance, and easy cleaning to adapt to high-frequency usage scenarios such as vehicle traffic and pedestrian walking.

[0003] Terrazzo flooring boasts exceptional wear resistance and high compressive strength, enabling it to withstand substantial loads and offering a long service life. It's a popular choice for high-end underground parking garages. Currently, the most common types are inorganic terrazzo flooring and epoxy terrazzo flooring. Inorganic terrazzo is a high-end flooring formed by uniformly mixing inorganic composite masterbatch and natural colored stones in a specific ratio, then spreading and leveling the mixture on a prepared base layer. This two-layer construction method involves first constructing the base layer, and then, 2-4 months after completion, allowing the stress in the base layer to fully release, the surface layer is applied. This two-layer construction method results in a longer stress release period for the subbase, increasing the risk of delamination due to frequent vehicle traffic in the garage, and slightly raising the cost to around 600-800 yuan per square meter. Epoxy terrazzo is a high-end flooring made by uniformly mixing epoxy terrazzo resin and natural colored stones in a certain proportion, then spreading and leveling the mixture on a prepared base layer. This type of flooring requires a base leveling layer to be constructed first. The surface layer is then constructed 2-4 months after the base leveling layer is completed, once the stress has been fully released. During construction, the floor must be completely dry and free of moisture, and the construction area must be completely enclosed to prevent overlapping construction. It has high requirements for the construction environment. This type of flooring is seamless, clean, beautiful, wear-resistant, durable, lightweight, environmentally friendly, and pollution-resistant, but it is relatively expensive, costing around 700-1500 yuan per square meter.

[0004] In order to reduce the cost of terrazzo flooring in underground parking garages while meeting the performance requirements, it is necessary to improve the existing solutions. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a construction process for terrazzo flooring in underground parking garages.

[0006] The technical solution of this invention is: a construction process for terrazzo flooring in an underground parking garage, the steps of which are as follows.

[0007] Step 1, Base treatment: Use a milling machine to roughen the surface, and use a high-pressure water gun to wash the roughened concrete surface; Step 2, formwork setting by dividing the work area: construct formwork in sections, pour interface agent evenly into the working area of ​​the formwork, and then add cement to form a water paste. Step 3, pour concrete raft slab: pour concrete in sections in sequence and pour it to the elevation position in one go. Vibrate the concrete and lay cold-drawn steel wire mesh on its surface after vibration. Step 4, Spreading colored stones: When the concrete has initially set, spread the colored stones evenly, spreading 6-8 kg per square meter. After spreading, fully lift the slurry and use a mechanical trowel to finish the surface. Step 5, joint cutting and curing of colored stone flooring: Cut joints in the colored stone flooring according to the marked lines, and absorb the mud while cutting. After curing, cover with cotton felt. Step 6, Grinding and Polishing of Colored Stone Flooring: After covering with cotton felt for 28 days, grind and cure the colored stone flooring. Use a combination of dry grinding and wet grinding. After applying two coats of curing agent, grind to 2000 mesh.

[0008] Preferably, the grinding process in step S6 is as follows: ① Use No. 3, No. 6 and No. 16 diamond grinding heads in sequence to polish the surface. Polish the surface twice horizontally and twice vertically with each grinding head, and clean the dust in time. ② Grind with 30-grit, 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning the dust in time; ③ Grind with 50-mesh and 150-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each grinding head; ④ Use a 300-grit resin grinding disc to polish twice, horizontally and vertically; ⑤ Spray component A of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material; ⑥ After the curing agent material is completely dry, use a 500-grit resin grinding pad to sand it twice, horizontally and vertically. ⑦ Grind horizontally and vertically twice each using 1000-mesh and 2000-mesh resin grinding discs in sequence; ⑧ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad for fine horizontal and vertical polishing.

[0009] Preferably, after grinding in step ③, use a steel brush to remove dust and slag from the pits and depressions in the ground, spray concrete repair welding agent, and use high-strength repair mortar to fully repair the pits, depressions, honeycomb holes and post-cast strip grooves in the ground. Only after the repaired ground is completely dry can step ④ be carried out.

[0010] Preferably, after grinding in step ⑦, apply concrete repair welding mortar for a second repair and scraping. After it dries thoroughly, spray component B of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material.

[0011] Preferably, the grinding process in step S6 is as follows: ① Grind the floor with 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning up the dust in time; ② Grind with 50-mesh, 150-mesh, and 300-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each type of grinding head; ③ Spray component A of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material. After the curing agent is completely dry, use a 500-grit resin grinding pad to sand it twice horizontally and vertically. After it is thoroughly dried, spray component B of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material. Use a 500-grit resin grinding pad to sand it twice horizontally and vertically. ④ In the fine grinding stage, use 1000-mesh and 2000-mesh resin grinding discs to grind twice horizontally and twice vertically each time; ⑤ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad to finely polish horizontally and vertically.

[0012] Preferably, the diamond grinding head is used for dry grinding, while the resin grinding disc is used for wet grinding.

[0013] Preferably, the cold-drawn steel wire mesh uses 6mm or 4mm cold-drawn wire with a specification of 200*200, and the cold-drawn steel wire mesh is placed 2-3cm above the concrete layer.

[0014] Preferably, the formwork is extended outward by 20mm, and the excess part is cut off after demolding.

[0015] The beneficial technical effects of this invention are: (1) The construction process of the terrazzo floor in the underground garage is to cast the colored stone and concrete raft as a whole. After the casting is completed, there is no gap and no delamination will occur. It is easy to construct, wear-resistant and pressure-resistant, and has low water absorption. Furthermore, the leveling layer construction process is not required, which saves the leveling, curing, hardening and stress release cycles. The cost is about 200-260 yuan / square meter. While ensuring the performance requirements of the terrazzo floor in the underground garage, the cost is greatly reduced.

[0016] (2) The construction process of the terrazzo floor in the underground garage is designed with two grinding schemes in combination with dry grinding and wet grinding, depending on the different original surface formation and protection quality of the floor. Different original surface formation and protection quality of the floor can be matched with different schemes, avoiding waste of labor and materials, saving construction costs, and improving construction efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the terrazzo flooring of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure after cross-section; Figure 3 This is a finished product image of the terrazzo flooring of this invention; Figure 4 This is a flowchart of different construction stages of the present invention; Figure 5 This is a flowchart of the entire invention; Figure 6 This is a field diagram of the specific implementation process of the present invention.

[0018] In the picture, 1. base layer, 2. raft slab, 3. colored stone, 4. hardener, 5. polished and glazed surface, 6. finished product after curing. Detailed Implementation

[0019] Example 1, see appendix Figure 1-5 A construction process for terrazzo flooring in an underground parking garage, the process is as follows: Step 1, Base layer 1 treatment: roughen the concrete surface with a milling machine and wash it with a high-pressure water gun; Step 2, formwork construction by section: construct formwork in sections, pour interface agent evenly into the working area of ​​the formwork, and then add cement to form a water paste; extend the formwork outward by 20mm, and cut off the excess part after demolding. Step 3, pour concrete raft slab 2: pour concrete in sections in sequence and pour it to the elevation position in one go. Vibrate the concrete and lay cold-drawn steel wire mesh on its surface after vibration. Step 4, Spreading Colored Stone 3: When the concrete has initially set, spread Colored Stone 3 evenly, spreading 6-8 kg per square meter. After spreading, fully lift the slurry and use a mechanical trowel to finish the surface. Step 5, joint cutting and curing of colored stone flooring: Cut joints in the colored stone flooring according to the marked lines, and absorb the mud while cutting. After curing, cover with cotton felt. Step 6, Grinding and Polishing of Colored Stone Flooring: After covering with cotton felt for 28 days, grind and cure the colored stone flooring using a combination of dry and wet grinding. Apply two coats of curing agent 4, then grind to 2000 grit. After polishing, apply a glaze to form a polished and glazed surface 5. The amount of glaze agent used is 0.3 kg / m². 2 .

[0020] Step 7: After the bottom surface is dry, apply a protective agent and cure to form the finished product (6). The grinding process in step S6 is as follows: ① Use No. 3, No. 6 and No. 16 diamond grinding heads in sequence to polish the surface. Polish the surface twice horizontally and twice vertically with each grinding head, and clean the dust in time. ② Grind with 30-grit, 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning the dust in time; ③ Grind with 50-mesh and 150-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each grinding head; ④ Use a 300-grit resin grinding disc to polish twice, horizontally and vertically; ⑤ Spray the A component of the two-component curing agent solution 4, wetting it evenly until every inch of the ground is saturated with the material; ⑥ After the curing agent 4 material is completely dry, use a 500-grit resin grinding pad to sand it twice, horizontally and vertically. ⑦ Grind horizontally and vertically twice each using 1000-mesh and 2000-mesh resin grinding discs in sequence; ⑧ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad for fine horizontal and vertical polishing.

[0021] The grinding process uses dry grinding with diamond grinding heads and wet grinding with resin grinding discs.

[0022] After grinding in step ③, use a steel brush to remove dust and slag from the pits and depressions on the ground. Spray concrete repair welding agent, and use high-strength repair mortar to fully repair the pits, depressions, honeycomb holes, and grooves in the post-cast strip. Only after the repaired ground is completely dry can step ④ be carried out.

[0023] After grinding in step ⑦, apply concrete repair welding mortar for a second repair. After it dries thoroughly, spray component B of the two-component hardener solution 4, wetting it evenly until every inch of the ground is saturated with the material.

[0024] This grinding process is suitable for projects with poor original floor surface shaping and protection quality. It ensures the quality of the floor through fine grinding and repair.

[0025] Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that step S6 adopts the following grinding construction process: ① Grind the floor with 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning up the dust in time; ② Grind with 50-mesh, 150-mesh, and 300-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each type of grinding head; ③ Spray component A of the two-component curing agent 4 solution, evenly wetting it until every inch of the ground is saturated with the material. After the curing agent 4 material is completely dry, use a 500-grit resin grinding pad to sand it twice horizontally and vertically. After it is thoroughly dried, spray component B of the two-component curing agent 4 solution, evenly wetting it until every inch of the ground is saturated with the material. Use a 500-grit resin grinding pad to sand it twice horizontally and vertically. ④ In the fine grinding stage, use 1000-mesh and 2000-mesh resin grinding discs to grind twice horizontally and twice vertically each time; ⑤ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad to finely polish horizontally and vertically.

[0026] This embodiment is suitable for projects with good original surface shaping and protection quality. It can effectively avoid waste of labor and materials, save construction costs, and improve construction efficiency.

[0027] Example 3 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the process of pouring the concrete raft slab 2 is as follows: ① Vibrate thoroughly, especially at the edges and corners; after the concrete is leveled, the cement slurry should rise to the surface at least 3mm thick. ②After the concrete is poured to the design elevation, lay the precast steel mesh (if steel fiber is used, it needs to be pre-mixed when the concrete leaves the factory), and then step on it to press it down to about 3 cm below the concrete surface; ③Protect finished wall and column structures.

[0028] ④ The flatness of the same zone should be within 4mm. When the basement area is large, a concrete laser leveling machine can be used for paving.

[0029] ⑤ The steel mesh is made of 6mm or 4mm cold-drawn wire, 200*200mm, according to the design requirements. The mesh is pre-processed and laid after the concrete is vibrated, thus ensuring that the steel bars are 2-3 cm above the concrete, minimizing the risk of cracking in the floor later. Alternatively, steel fibers can be added to minimize the risk of cracking in the floor later.

[0030] ⑥ Carefully vibrate with an immersion vibrator, inserting quickly and withdrawing slowly, until the cement concrete surface stops bubbling and the grout stops settling. During this process, manually assist in leveling to achieve a surface with grout and a generally smooth surface. After each concrete section is vibrated, use an automatic roller to move it back and forth 4-5 times until the upper surface is level, covered with the original grout, and the coarse aggregate is compressed and compacted to the lower part of the concrete. After each concrete section is kneaded, carefully smooth it manually with an aluminum alloy screed to achieve a smooth and glossy upper surface.

[0031] ⑦ Pouring should be carried out in sections and in sequence to avoid uneven concrete setting. Before pouring, ensure that the sump frame in the garage is firmly fixed according to the elevation. It is recommended to pour to the design elevation in one go. If a waterproof membrane is not applied, a water-based binder should be sprinkled to keep the foundation moist. For the base layer 1 concrete, the grouting should be sufficient (not less than 5mm), especially at the corners. Protect the finished product before vibration. After grouting, the concrete bleeding should be uniform. For any water pockets, they must be removed and the surface leveled again; otherwise, the flatness of the floor construction cannot be guaranteed. The initial leveling work should be as flat as possible to ensure that the final finished surface has a height difference of less than 3mm / 2M.

Claims

1. A construction process for terrazzo flooring in an underground parking garage, characterized by the following steps: Step 1, Base treatment: Use a milling machine to roughen the surface, and use a high-pressure water gun to wash the roughened concrete surface; Step 2, formwork setting by dividing the work area: construct formwork in sections, pour interface agent evenly into the working area of ​​the formwork, and then add cement to form a water paste. Step 3, pour concrete raft slab: pour concrete in sections in sequence and pour it to the elevation position in one go. Vibrate the concrete and lay cold-drawn steel wire mesh on its surface after vibration. Step 4, Spreading colored stones: When the concrete has initially set, spread the colored stones evenly, spreading 6-8 kg per square meter. After spreading, fully lift the slurry and use a mechanical trowel to finish the surface. Step 5, joint cutting and curing of colored stone flooring: Cut joints in the colored stone flooring according to the marked lines, and absorb the mud while cutting. After curing, cover with cotton felt. Step 6, Grinding and Polishing of Colored Stone Flooring: After covering with cotton felt for 28 days, grind and cure the colored stone flooring. Use a combination of dry grinding and wet grinding. After applying two coats of curing agent, grind to 2000 mesh.

2. The construction process for terrazzo flooring in an underground parking garage according to claim 1, characterized in that: The grinding process in step S6 is as follows: ① Use No. 3, No. 6 and No. 16 diamond grinding heads in sequence to polish the surface. Polish the surface twice horizontally and twice vertically with each grinding head, and clean the dust in time. ② Grind with 30-grit, 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning the dust in time; ③ Grind with 50-mesh and 150-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each grinding head; ④ Use a 300-grit resin grinding disc to polish twice, horizontally and vertically; ⑤ Spray component A of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material; ⑥ After the curing agent material is completely dry, use a 500-grit resin grinding pad to sand it twice, horizontally and vertically. ⑦ Grind horizontally and vertically twice each using 1000-mesh and 2000-mesh resin grinding discs in sequence; ⑧ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad for fine horizontal and vertical polishing.

3. The construction process for terrazzo flooring in an underground parking garage according to claim 2, characterized in that: After grinding in step ③, use a steel brush to remove dust and slag from the pits and depressions on the ground. Spray concrete repair welding agent, and use high-strength repair mortar to fully repair the pits, depressions, honeycomb holes, and grooves in the post-cast strip. Only after the repaired ground is completely dry can step ④ be carried out.

4. The construction process for terrazzo flooring in an underground parking garage according to claim 3, characterized in that: After grinding in step ⑦, apply concrete repair welding mortar for a second repair. After it dries thoroughly, spray component B of the two-component hardener solution, wetting it evenly until every inch of the ground is saturated with the material.

5. The construction process for terrazzo flooring in an underground parking garage according to claim 1, characterized in that: The grinding process in step S6 is as follows: ① Grind the floor with 50-grit, 80-grit, and 120-grit diamond grinding heads in sequence, grinding twice horizontally and twice vertically with each type of grinding head, and cleaning up the dust in time; ② Grind with 50-mesh, 150-mesh, and 300-mesh resin grinding discs in sequence, grinding twice horizontally and twice vertically with each type of grinding head; ③ Spray component A of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material. After the curing agent is completely dry, use a 500-grit resin grinding pad to sand it twice horizontally and vertically. After it is thoroughly dried, spray component B of the two-component curing agent solution, wetting it evenly until every inch of the ground is saturated with the material. Use a 500-grit resin grinding pad to sand it twice horizontally and vertically. ④ In the fine grinding stage, use 1000-mesh and 2000-mesh resin grinding discs to grind twice horizontally and twice vertically each time; ⑤ Spray with high-penetration polishing liquid, let it air dry naturally, and then use a bristle polishing pad to finely polish horizontally and vertically.

6. A construction process for terrazzo flooring in an underground parking garage according to any one of claims 2-5, characterized in that: The diamond grinding head is used for dry grinding, while the resin grinding disc is used for wet grinding.

7. The construction process for terrazzo flooring in an underground parking garage according to claim 1, characterized in that: The cold-drawn steel wire mesh uses 6mm or 4mm cold-drawn wire with a specification of 200*200, and is placed 2-3cm above the concrete layer.

8. The construction process for terrazzo flooring in an underground parking garage according to claim 1, characterized in that: The formwork is extended 20mm outwards, and the excess part is cut off after demolding.

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