the main Laboratory Building monitoring Concrete additives Antifreeze additives Articles Contacts the main Core drilling If it is impossible to check the quality of the concreting of the pile shaft or, if necessary, to control the quality of cleaning the well under the heel of the pile, it is carried out by the method of control drilling with core sampling and their subsequent testing in accordance with GOST 10180-90. This control drilling is subjected to 2% of the total number of piles. Drilling of cores in bored piles, as a rule, is carried out when the concrete is at least 28 days old. In the pile selected for control drilling, one vertical well is drilled with a depth of 0.5 m below the base of the pile. The selected cores are tested for compression according to the following method: By crushing the cores in the process, the strength of the concrete is determined. Before testing, the cores are leveled by cutting on the machine, since the ends of the cores after drilling have an uneven surface. Compression tests of cores are carried out in the same way as testing concrete samples. Core testing can be performed without leveling the ends. For this, pressure can be transferred from the press plates to the ends of the cores. In this case, there is no friction between the ends and the plates. The study is also influenced by the length of the cores. The reduction of the test results to the strength of concrete in a cylindrical specimen is carried out as follows: 1. For cores tested with friction at the ends: where: Rts - tensile strength of cylindrical specimens; Rrazr - breaking load, kgf; S - core area, cm2; is the coefficient taking into account the ratio of the length of the core to its diameter, here The transition from the cylindrical strength of the sample to the cubic one is made according to the formula Rcub = 1.2Rts. 2. When tested without friction at the ends (through a sand cushion), the corresponding formulas will be as follows: The rest of the designations are the same: Rcube = 1.2Rts. Core samples are also drilled out for: inspection of the condition of masonry walls by visual inspection of drilled cores quality control of injection works to strengthen walls and foundations access of the construction endoscope camera to closed cavities and rooms viewing the image on the monitor of the walls of the drilled well Product Catalog Concrete admixtures Antifreeze additives for concrete Superplasticizers and plasticizers of concrete Hyperplasticizers Vibration measurements Construction laboratory Engineering survey Standards Licenses Stamps in pits Stamps at the base of the piles Electrotomography Building surveys Building monitoring Technology Equipment Standards Licenses Pile testing Completed work Sonyc test Core drilling Static tests Our contacts Address: 115191 Moscow, Kholodilny lane, 3, bldg. 8, bldg. 1 Phone: +7 (495) 926-42-66 +7 (495) 955-29-51 +7 (495) 955-29-66 +7 (495) 955-29-73 Fax: +7 (495) 959-78-21 E-mail: tplast08@mail.ru © 2011-2018 SPC Technoplast Site creation: "E.Studio"