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Soft Ground Design and Construction Quality Control

Equipment, goods or make alterations; entry devices must be equipped with good performance, can show changes in drill pipe drilling ammeter when the current display and measurement of pipeline pressure gauge the amount of cement spray people or flow meter electronic scales. 4.2 site construction management. DJM is a hidden underground works, the quality control should be run through the whole process of construction, and should adhere to the full, the whole process of construction supervision. The Contractor shall DJM quality, progress is responsible for, each must have a hand drill operation. Material supply. Construction site should be carried out sampling of each batch of cement to meet the design requirements of the cement works will be allowed into use, prohibited the use of expired, moisture, caking, degeneration of the inferior cement. Construction technology. Construction of the venue prior to DJM leveling should be carried out to remove piles located at the ground, all underground obstructions such as rocks, roots, etc., and clear the statement. Low-lying site, you should first fill soil, ditch pond located at the need to fight DJM, priority should be given pumping, dredging, and the entire equality. Miscellaneous fill against backfilling. DJM main construction process: Dusted noisy machinery in place pre-mix powder mixing sink + raised to 0.3m from the ground subsidence at + repeat + repeat stirring until the mix to enhance mixing off leaves from the ground 0.3m machinery. Enhance construction quality management. First, according to the technical operation of test pile to determine technical parameters of various construction elements of development for the site operator to comply. Under the strict control of drill hole depth, elevation, and stop gray powder surface,[link widoczny dla zalogowanych], length and spray volume to ensure the DJM meet the requirements. Second, the construction should be strictly controlled in time and stop spraying gray ash time to ensure DJM length, prohibiting Shangmo circumstances gray spray rig to enhance operations, each pile after pile of cement injection should be promptly checked people volume. Third, the mixer each time to sink or raise a personal record time error not more than 5s, have to wait before upgrading Pile powder feeding time arrives, but at the end to prevent dusting improve the situation, with specific time Machine type and send ash tube length varies. Fourth, the pile top 1 / 3 should be repeated within the mixing time and mixing length of less than 5m complex, according to 5m construction. Of particular note, the soft soil natural water content greater than 70% of the lot, requiring complex mixing length should be run through the soft soil. Fifth,[link widoczny dla zalogowanych], the drilling pipe when the pressure increase should not be too large to prevent the drilling mud to the hole wall L larvae extruded to form around the hole. Sixth, in the pile during pile quality effects such as an accident, you should fill in the 12h spray measures taken to make up spray overlap length of not less than 1. Om appropriate. 64 TECHNOLOGY INFORMATION SCIENCE & TECHNOLOGYINFORMATION4.3 quality testing. Soft Ground,[link widoczny dla zalogowanych], the final quality control parameters to ensure the overall bearing capacity of composite foundation, for twenty thousand faces, including the content of DJM detection: survey and setting out the pile testing, that is about 7d after the pile, by detecting the pile bits, number of piles, pile spacing to check the loft pile: The pile itself, the quality of testing, including the integrity of the pile, the pile shaft cross-section f dimensions, effective length, etc. 1, the continuity of the pile, uniformity, strength, density, bearing capacity, etc. The most important control parameter for the bearing capacity. Detection method. First, the visual method. 7d pile, the excavation of 0.5-1.0m deep pit, measuring Pile, pile spacing, check the number of piles, does not meet the design requirements should be completed pile or to take other effective measures; to meet the requirements and then check the shaft forming situation,[link widoczny dla zalogowanych], through the pile top is flush with visual group, whether the circular pile uniform, whether the phenomenon of necking and depression, the pile of cement lumps or folders with or without mud layers are the same color depth, and pile loose hand perception or induration level, to determine the soil cement mixing pile uniformity, for the wall can also visually check the lap pile pile pile head part of the lap situation. Second, the interception of pile pressure test section method. A certain age in the pile after pile out in the field of upper excavation,[link widoczny dla zalogowanych], the length of the pile is equal to the interception of the following consecutive three sections pile diameter pile. Upper and lower cross-section leveling with cement mortar, loaded with the press after the pressure test stand pressure can be measured compressive strength and deformation of pile modulus, but also can damage the pile to further observe the compression section of the pile powder mixing uniformity. The method tested million direct and reliable data, both the accumulation of indoor and field strength data relationships between strength and avoid the pile up the strength of non-uniform cross-section of million. Third, the static load test. Since the end of the control parameters DJM is the overall composite foundation bearing capacity, static load test in the pile after a certain age, or composite pile foundation of a certain stiffness of the plate through to test the load bearing capacity of foundation method is the most close to the ground by the force of the actual situation, the most accurate, direct measurement of composite foundation pile or the most standard method.