Mudjacking, sometimes called slabjacking or pressure grouting, is the lifting of a concrete slab or foundation, usually slabs, by pumping a concrete grout slurry under high pressure, beneath the existing concrete.
Evidence of mudjacking is usually a group of holes around 1 5/8 inch to 2 inches in diameter. They are often in a pattern of some sort and about 3 feet apart.
这个是用来种drug 的吗？是drain？ 还是放 trailer 的架子造成的损坏？
https://buyersask.com/interior/garage/patched-holes-in-garage-floor-structural-issues-or-for-pest-control-treatment/#:~:text=Holes%20cored%20or%20drilled%20into,may%20be%20a%20warning%20sign.
Holes for MudjackingMudjacking, sometimes called slabjacking or pressure grouting, is the lifting of a concrete slab or foundation, usually slabs, by pumping a concrete grout slurry under high pressure, beneath the existing concrete.
Evidence of mudjacking is usually a group of holes around 1 5/8 inch to 2 inches in diameter. They are often in a pattern of some sort and about 3 feet apart.
这个是因为水泥板块下面的土遗失，导致水泥板下陷。他们用泥浆把水泥板顶平，但是你要调查一下问题是否还存在。