How to solve the problem of height difference in stone floor joints? (2)

3、 Machine selection

1. Universal marble/granite stone grinding machine

After comparing several foreign brands, we chose the Italian bridge mill series products.

The single-head grinder weighs 245 kilograms with 7.5 horsepower and uses a 380V three-phase power supply. There is a cooling water storage tank on the machine, which can store water and increase the pressure of the grinding head, improving work efficiency and grinding quality. There is a simple operating wheel and a circular leveling bubble in the center of the body, which can accurately adjust the levelness of the body during operation. All grinding blocks are imported, and hydraulic jacks can be operated to lift and lower the machine body during the installation and replacement of grinding blocks.

The external nylon splash guard of the grinding head. The upper rubber protective ring ensures that it will not damage the wall during operation. When doing homework, grinding blocks should be selected based on the quality of stone pavement and the type of stone, and the process should be carried out in the order of coarse grinding, fine grinding, fine grinding, polishing, and crystal hardening treatment.

Generally, granite flooring uses grinding blocks with the fineness of 60, 120, 220, 400, 800, 1200, and 10LG (polished). The marble floor uses grinding blocks with a fineness of 20 mesh, 220 mesh, 3/4S (coarse polishing), and EXTRA (fine polishing). Each type of grinding block must be ground three times or more. When to replace the grinding block still depends on the experience of the operator. Forming a small group of two grinding machines for assembly can reduce the time required to replace grinding blocks and improve productivity.

2. Water suction vacuum cleaner

When used in conjunction with a stone grinding machine, remove the cooling water from the machine at any time to avoid contaminating the ground. It is best to have two grinders equipped with one suction vacuum cleaner.

3. New Stone Refurbishment and Crystal Hardening Machine

This is a multi-purpose machine that can also grind stone floors with grinding discs installed, but due to its lightweight, the grinding efficiency is not as good as stone grinding machines. Mainly used for crystal hardening treatment, using two types of specialized water agents. On the cleaned ground that has already been ground, the grinding disc drives the fine steel wire pad to quickly rotate and generate high temperature, causing the surface of the stone to form silica crystals and polish under the action of the specialized water agent.

4. Electric hammer machine

Using a German lightweight three-head hammer machine, it can chisel the surface of mirror stone according to design requirements. Single-person handheld operation, very lightweight.

5. Sandblasting machine

The German dust-free sandblasting machine is selected, which looks like a vacuum cleaner, but its hose has a double-layer inner and outer sleeve. Diamond sand is sprayed from the inner pipe to chisel the surface of the stone, and the outer sleeve can retract the diamond sand. The machine can select diamond sand of different particle sizes according to design requirements, and carve any shape of different rough surfaces. In the current project, it is used to chisel the exposed corners.

4、 Construction process and precautions

1. Overall polishing construction process for stone flooring:

① On-site investigation to understand the types of stone materials used in the design, mosaic patterns, and ground area, as well as the quality of on-site paving. If there are obvious quality problems such as hollowing, large gaps, obvious color differences, and uneven stone patterns, they must be replaced first.

② Check if the ground stone has been coated with a waterproof protective agent, and if necessary, make up for it.

③ Draft a construction plan and submit it to the general contractor and the owner for approval.

④ Protect the walls, columns, and door frames within the work area with protective film, with a protective height of at least 500 millimeters.

⑤ Before construction, a 2-meter ruler and feeler gauge should be used to survey the flatness of the original construction ground and make records.

⑥ Use a stone grinding machine to grind from the inside out, and select appropriate grinding blocks according to the type of stone. Replace the grinding blocks step by step from coarse to fine, and grind the granite floor to 800 mesh grinding blocks. During the grinding process, the inspector should use a 2-meter ruler and feeler gauge to check the flatness of the ground after grinding at any time and guide the construction personnel to pay attention.

⑦ Repair the gaps and missing materials in the ground after grinding.

⑧ Fine grinding and polishing Crystal hardening treatment.

⑩ Quality inspection for glossiness and flatness, write a quality acceptance report and submit it to the supervising engineer.

2. During the construction process, the following points should be noted:

(1) It is necessary to understand and test whether the original paved stone has been coated with a stone waterproofing agent to avoid polluting the ground during construction.

After paving the stone floor, there is a significant difference in the height of the joints, so do not use a hand grinder to grind it. Because it is easy to create pits when grinding with a hand grinder, which increases the amount of machine grinding.

Construction fencing must be done well, especially for wooden doors and skirting lines, to prevent deformation due to moisture.

If the stone joint is large, it should be filled first, and grinding can only be carried out after 24 hours of repair.

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