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Beneficiation Mine Technology-What are the safety measures for bored pile construction in tunnel civil engineering?
Release time:
2019-07-05
Author:
Source:
What are the safety measures for the construction of bored piles in tunnel civil engineering? Shandong Yikuang Drilling and Mining Technology Co., Ltd. produces all kinds of geological drill pipes dedicated to drilling engineering, spiral drill pipes, triangular heavy-duty grooving drill pipes, special-shaped multi-angular grooving drill pipes, coal drill pipes, drill bits, drill pipes, etc., with complete specifications! Strength manufacturers, trustworthy! The company integrates research and development-production-sales-after-sales. Customers are welcome to purchase. Tel: 0635-2311078 1. Hole collapse prevention According to the analysis of bored pile construction technology and mechanical equipment used in construction, the following safety measures are specially taken: before construction, the engineering geological characteristics of the stratum should be taken
Beneficial Mining Technology--What are the safety measures for bored pile construction in tunnel civil engineering?
Before construction, drilling measures should be formulated according to the engineering geological characteristics of the formation, and the selection of reasonable mud parameters is an important part of the prevention of hole collapse. CASING USES10mmThick steel plate processing, the inner diameter is larger than the design aperture20～40cm, its upper opening2A spills. When buried, the top of the casing is higher than the ground.0.5Meters, deep water riverbed for soft soil, silt, sand at not less3mWhen the soft soil and silt layer is thick, it goes deep into the impermeable clay layer.1.5m. Use clay mud to protect the wall and control the relative density of mud.1.2～1.6, sand content is not more4%, viscosity16～28s, the colloid rate is not less95%, the water loss rate is not more20ml/30min, the thickness of mud skin is not more3mm/30min,PHValue8～11. Keep the mud surface of the retaining wall not lower than the top surface of the casing.0.5m. When the formation is poor, increase the mud density to balance the pressure in the hole, and appropriately reduce the drilling speed to effectively prevent hole collapse.
2. Partial hole prevention
Level and compact the stratum at the substructure of the drilling rig, and lay sleepers at the bottom of the drilling rig to prevent uneven settlement of the stratum. The positioning of the drilling machine should be accurate, and the bit alignment error is less2cm, keep the center of the rotary table of the drilling rig, the center of the crane and the center of the casing on the same vertical line to avoid the displacement of the drilling rig base. During the construction process, check whether the drilling rig is horizontal and drill to the depth of the hole.1/23. Check the verticality of drilling after drilling.
3.Yikuang Technology Bit Drill PipeIn case of hole collapse, hole deviation or slurry spitting around the casing during drilling, the following measures can be taken to deal with it.
When the drill hole is inclined, lift the drill bit to the offset hole, and slowly and repeatedly sweep the hole for correction. When the drilling inclination is seriously invalid, backfill the hole to the upper part of the partial hole.0.5Rice to be settled after the chamber re-drilling.
In the drilling, if the water level in the casing drops sharply and bubbles emerge, the hole may collapse. For slight hole collapse, take measures such as slowing down the drilling speed and increasing the mud density to pass through the collapsed hole; when the hole collapse is serious, stop drilling immediately and fill with clay, and then drill in after the hole wall is stable.
Shandong Yiguang Drilling and Production Technology Co., Ltd. produces various geological drill pipes for drilling engineering., spiral drill pipe,Triangular heavy grooved drill pipe,Special-shaped multi-edge grooved drill pipe, coal drill pipe,Drill,Drill pipe, etc., complete specifications!Strength manufacturers,Trustworthy!Company set research and development-Production-Sales-After-sales as a whole, welcome customers to purchase.
During the construction of bored piles, the construction must be carried out in strict accordance with the pouring of one piece after the hole is formed, so as to prevent the hole from collapsing due to too long drying time after the hole is formed. At the same time, the construction shall be organized in strict accordance with the construction sequence in the construction technical disclosure, and the minimum time interval between two adjacent piles shall not be less24hours, to prevent the construction occurred when the string hole.
After concrete pouring, the hole hole must be covered with steel mesh or wood to prevent personnel from falling into the hole and causing safety accidents.
Key words:
Geological drill pipe, spiral drill pipe, triangular drill pipe, new coal drill pipe, rib drill pipe, drill pipe
