1, bored piles construction. {&3{_Ml
(1) pre-construction preparation work !N"Y
a, site formation, removing debris, filling should be returned to ram a dense. s\/$`fuhx
b, set up networks and closed traverse senior municipal control point close to standardize requirements of precision, experience or after passing the wire, piles of points as the reference point lofting. Traverse the same points to close to accuracy. Pile-point in laying casing will be destroyed, so pile sites have been determined, the protection Add more than two piles. Checking with the protection of piles for the accuracy of cones. Ensure that the pile-point deviation to meet the requirements. Setting out in full measure station-theodolite, polar coordinates calculations. The distance between the pile-checking available Gangchi measure. J2Y
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c, digging mud pools, sedimentation tanks, storage pond, ready to pass or bentonite clay. 0*y| k1
d, connected to water and power supply. 'j&+Pg)@
e, laying casing, the casing around should be strengthened, higher than the top surface 30 cm, depth at the bottom of 1.5-2.0 m, casing pile diameter than the diameter of 20 cm, from top to bottom, integrity, casing the centerline plane deviation is less than 5 cm. General use of steel casing, the thick steel plate 0.8-1.0 cm. Casing artificial or mechanical means planted, and proved underground obstructions. M VDEV q0
f, remove underground obstructions. There may be some pipe network will occupy pile-must be bored pile construction, identify underground pipe network, as soon as possible to take measures to move out of the pile-on underground obstructions. ip)gI&kN`z
g, pile-place. Rack should be straight, steady-seat, not hard and soft uneven, the general pile driver Xiadianzhenmu. Drilling in the course of displacement and can not rack uneven subsidence. ^ p7g[E&
h, mud indicators. Clay-16 "-17", sand 17 "-19", Sand rate of no more than 8 percent, more than 90 percent of colloidal rate, the proportion of about 1.2-1.4. Drilling mud direct impact on the quality of progress. S29k I J
i, should be made of mud trough high 20 cm, width 30 cm, length of not less than 15 m, mud flow rate of not more than 10 cm / s. >n(Ga9E
j, borehole drilling machinery to use the roundabout. Design requirements into the bottom 2 m. . <?h,;] U
(2) Drilling =pa
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a, it is necessary to firmly link drill, vertical, speed and do not fall in the early drilling in the 4.0 m-deep within, not more than 2 m / h, after no more than 3 m / h. In the cover should always decompression drilling, drilling mud and the rate of emissions suit. Punching drilling in the hole when the slower, less than 2.0 m deep hole, not exceeding 1.5 m / h.
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b, in the course of drilling, testing often indicators of changes in the mud, and pay attention to the adjustment of drilling mud concentration, the depth of 2-3 meters of underground water level, mud pressure over water pressure to meet construction specifications. N g,< 4;
c, carry out regular checks of equipment functioning, the unusual situation immediately for further investigation, the timely processing. Wire Rope and lubrication of the class must be checked. b_v {Q E<
d, small tools such as wrenches, hammer, bolt rope Qiaogun with insurance firm to prevent the fall into the hole. vXI2 u;=y
e, often observed the attention of bored, cracking or near the ground there for extinguishers, whether the pile-tilt. mto=_|gn
f, strictly abide by the technical operation of a point of order, good drilling records. Records to reflect changes in the mud. 4;;K1< 1
g, drilling depth to the design, to the supervising engineer at the scene and construction units of the common judgement of personnel and accurate determination of deep holes. Elevation as the basis for the final hole. SOg>0VH)
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(3)-- +5<] s+4T
a, drilling depth to the design, construction units by the end-request, to be decided by the scene supervising engineer, and aperture, the hole deviation, the deep hole acceptance. Acceptance is to create a length equal to 4-6 times the pile diameter, aperture diameter equal to the reinforcement cage, the cage hanging Add to be reinforced hole, and the smooth design requirements into the hole at the end of that aperture and meet the required degree of deviation. With deep hole measuring rope and Gangchi measure. Steel-cage also do not need to repair holes in the end until the hole vertical wall, the reinforcement cage can be smoothly put in the end so far. Lnk(l2~U
b, Chiang Khong is used for pulp of magma-hole, hole after mud-share index between 1.15-1.20, Sand was less than 4 percent, viscosity 20-22 ", the hole at the end of the dregs of less than 5 cm. for Prevent the hole larger than the dregs of regulatory requirements, generally with noisy tube pumping silt eliminated first hole再换pulp. -mfd ngp3
c, should be maintained-holes bored in the mud of 1.5-2.0 m above the water table to prevent the collapse of holes. <h"07.y
d,-hole meet the requirement, the acceptance by the Commissioner of Engineers once again deep holes, mud and sediment thickness. The Commissioner of Engineers visa, agreed to concealment, perfusion concrete, and then on to the next procedure. -h%! #g
(4) of the reinforcement cage (6g;FD:"6
a, the venue must be reinforced with certification, each batch of materials, specifications are required for each sample after passing the check for usage. 8
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b, production of steel cage must be in strict accordance with the design and implementation of regulatory requirements. General steel cage used welding method, individual connections to tie hole. Reinforced steel cage outside the positioning of precast concrete can be perforated hollow cylinder, or directly by forming and bending steel bars in the welding Zhu Jin, to ensure the protection of the main steel thickness. _DD.#YB</
c, the reinforcement cage must strengthen the hoop and welding firm Zhu Jin, general electrode 5 prefix models, to ensure the quality of welding steel cage. Steel cage during the installation process can not be deformed. \A%s" O/
d, a one-time use of the best steel cage a crane. 6C@W6DR3N
e, welded steel cage hanging to the top line, higher steel casing. Steel cage in place, hanging in the casing tendons supporting the top of the Zhenmu, can not be placed directly on the casing. ?yNg5z
f, ultrasonic testing of the pile reinforcement cage to install galvanized steel pipe connected with the stirrups, to ensure that detection pipe Bulou Shui. yH <a;@C
(5) pouring concrete underwater wgPkSsuBuC
a, with diameter of 20 cm catheter infusion underwater concrete. The length of each tube 3-4 m. The use of pre-fight test tube, and closed to test the water (0.3 Mpa), 15分钟Bulou Shui suitable. Double-check the catheter Weld. .ey=gI!x0
b, duct installation should be above the hole at the bottom end of 30-40 cm. Concrete catheter buried deep within 2-3 m, the deepest of not more than 4 m, the most shallow of not less than 1 m, catheter to enhance the slow speed. f%gdFtJ &
c, a number of the concrete tube should be buried in concrete to meet the requirements of depth, before the opening of Beizu corresponding to the number. %G43g#pD
d, concrete-degree 18-22 cm, to prevent pipe. W|,Y*l
e, to continuously pouring concrete, interrupted for less than 30 minutes. Watering the pile should be higher than the elevation of 0.5 m above the sea level design. Concrete used Shangpin Tong-owned or mixing equipment, crane or hoist bucket into the groove with direct pumping concrete into shafts. %p d-{KR
f, construction of venues should ensure that sanitation, can not be mud everywhere spills, mud residue should be timely clearance. Y;I>rC (
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(6) pile test 9*&RvsrX
a, in addition to cutting the pile-raising concrete, steel pile head bends can not be arbitrary. Feng Gao, or cutting pile head with the exception of cutting. Pile elevation according to design requirements, the pile should be broadly formation. _$vAitUe4S
b, pile detection method is dynamic testing, ultrasound. Each pile testing method used by design engineers and quality inspection and supervision departments. Y( U+s\X
c, construction units with quality inspection departments of each pile for testing. Quality can pass on to the next procedure construction.
