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1、冬季施工方案 - lnlh2003的日志 - 網(wǎng)易博客（Winter construction program - lnlh2003's log - NetEase blog） Winter construction program - lnlh2003's Journal - NetEase blog, NetEase news micro-blog mailbox Lightning mail Album adhere to principles of truth and right Mobile mail An icon Fantasy

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7、tudents Field inspection report on temporary power consumption scheme Winter construction program construction 2009-06-24 13:45:08 read 255 review 0: big and small subscriptions 5, winter construction plan 5.1 after winter, manual excavation of bored piles, construction conditions have c

8、hanged the following: After 5.1.1 enters the winter, the temperature drops, the ground produces the frozen layer construction, the excavation difficulty increases. 5.1.2 enters the water temperature is reduced after the winter, well point dewatering pipes, water supply pipe, water pump, easy o

9、f ice, cracking. When the 5.1.3 enters the winter construction, the construction efficiency is reduced. After entering the winter construction of 5.1.4, the construction will be stopped in case of bad weather. After the resumption of work, measures such as on-site cleaning and other measures s

10、hould be taken. 5.2, in order to ensure the quality of construction work, ensure safety in production and ensure the construction period, take the following winter construction measures. 5.2.1 guarantee the construction quality measures of steel cage. The finished material and semi-finished

11、 material of the reinforcing steel bar should be piled up neatly, covered and laid in place to prevent the corrosion of the rebar due to the rain and snow. The cage shall be cleaned before the steel cage is hoisted. For semi-finished products, more cage, because of rain and snow and rust, rust remov

12、al work should be carried out in a timely manner. In the construction of reinforcing steel welding, when the ambient temperature is lower than 5 DEG C, the steel bar shall be welded by negative temperature welding of the steel bar, and the welder engaged in the welding of the steel bar must hold the

13、 certificate of steel welder examination. Safety technical measures shall be formulated and implemented to strengthen the labor protection of welders and prevent accidents such as burns, electric shocks and fires. Before welding the steel bar, the welding shall be carried out according to the constr

14、uction conditions, and the welding can be carried out after qualified. The welder shall check the appearance quality of all joints after the welding, and reject the unqualified ones. When welding with negative temperature, the welding parameters should be adjusted so that the welding seam and heat a

15、ffected zone can be cooled slowly. When winds exceed four, wind protection measures should be taken. After welding, the cold joint should be avoided to touch the ice and snow. Welding shall not be applied when ambient temperature is lower than 20 degrees centigrade. 5.2.2 steel negative temperatu

16、re arc welding 5.2.2.1 scope: Steel less than 22mm in diameter with a welding 5.2.2.2: j506, steel electrode selection 5.2.3 preparation before welding Before welding, the rust, slag and oil contamination of the welding area of the reinforcing steel bar must be removed, and the distortio

17、n and bending of the end of the steel bar should be straightened or removed by 5.2.3.1. 5.2.3.2 steel lap welding should use one side welding, can not carry out single side welding or double face welding. 5.2.4 welding process According to the steel grade, diameter, joint type and welding p

18、osition, welding current and electrode diameter selection, suitable welding, welding process should be adopted in multi temperature control, it is necessary to prevent cooling after welding speed is too fast, but also to prevent joint overheating. Welding process shall meet the following requirement

19、s: When welding, 5.2.41 shall be fixed at two points. Fixed by manual assistance, fixed, when the joint position is good after welding (ensure steel coaxial). 5.2.4.2 welding, the arc should begin in the end of the lap bar, in the end should be reinforced lap arc crater shall be filled up.

20、5.2.4.3 lap welding, the first layer of weld arc from the middle first, then to the ends of the arc. The first layer of pedlar shall have sufficient penetration, the main weld and weld positioning, especially in the beginning and terminal position of welding seam, should be good fusion. After each l

21、ayer of welding seam welding, stratified temperature control welding. The interlayer temperature is controlled between 150 DEG C and 350 DEG C, so as to play a role of slow cooling. H the weld thickness of 5.2.4.4 lap joints shall be no less than 0.3 steel bars; the width of welds shall be no les

22、s than 0.7, and the diameter of the steel bars shall be no less than 6. 5.2.4.5 grade reinforced bar joints of multilayer welding, the temper bead welding method ", namely: the final temper bead length than before the bead at both ends of the shortened 4 - 6mm. 5.2.5 quality acceptance 5.2.

23、5.1 sampling: visual inspection shall be carried out separately or visually after the joint has been removed. Tensile test, from the appearance of qualified finished products, cut three specimens per batch for tensile test. Take a tensile test at each of the 300 joints 5.2.5.2 visual inspection:

24、visual inspection results, should meet the following requirements: the weld surface formation, no sag, large overlap. There must be no crack at the joint. The undercut depth, the number of holes, the amount of slag and the size deviation of the joint shall not exceed the specified value. The appeara

25、nce of unqualified joints, after modification or reinforcement, can be submitted for the two acceptance. 5.2.6 connector notes When the steel bar is welded, the welded joints arranged in the same steel cage shall be staggered. In the range of 35 times of the diameter of the reinforcing bar (no

26、 less than 500mm), a steel bar shall not have two joints, and the sectional area of the joint reinforcement shall be 50% of the total sectional area of the steel bar. 5.3 ensure pore forming measures 5.3.1 construction, for individual prone to collapse of the pile, the use of large displacemen

27、t pumps, sedimentation tanks need to set up a shelter, as far as possible to avoid the precipitation pond icing. 5.3.2 uses steam (hot water) heating method on water pipeline to ensure smooth and timely cleaning pipeline residual water and sediment suspension transitions. Prevent the pipe from fr

28、eezing and cracking. 5.4 ensure the quality of perfusion construction 5.4.1 the construction site of the reasonable control of the concrete pouring speed, strictly control the construction process, coordinate the commercial concrete supply time, reduce or avoid the waiting time of the tanker w

29、ith concrete, which taking concrete into the hole temperature meets the requirement. 5.4.2 uses the hot water to the catheter and joints, threaded parts timely cleaning, prevent adhesion of ice, shorten the filling time. After the concrete is finished, the pipe is cleaned in time, and a special p

30、ipe rack is arranged on the spot. The pipe is sealed on the pipe rack to avoid the contact between the pipe and the ground mud. The 5.4.3 site pile pile buried below the surface (in Dalian, following the provisions of the deep freeze) into 24 piles of empty pile in time after backfilling, filling

31、 height of pile head height was 1.0m. 5.4.4 site set up a person to do a daily temperature record. 5.5 winter season guarantee measures 5.5.1 construction site to take measures to keep people warm 5.5.1.1 construction site will set up 3 movable rooms, with boilers for the on-site constru

32、ction workers to take turns heating. The 5.5.1.2 of each worker issued coats, gloves, cotton padded cap, masks and other warm supplies. 5.5.2 ensure manpower and equipment resources 5.5.2.1 50% - 100% more during the winter construction site construction and management personnel involved in

33、 construction, ensure the construction efficiency. 5.5.2.2 equipment operating units increased nuanpeng. 5.5.2.3 construction of vulnerable parts, pipelines, tools must be in stock, the construction site pipeline leakage, timely replacement. 5.5. 2.4 machines ready to be put into site op

34、eration shall be replaced with fuel, hydraulic oil and lubricating oil suitable for use in winter before the start of operation. Regular inspection and maintenance of equipment shall be carried out to ensure the normal operation of the equipment. 5.5.3 logistics support 5.5.3.1 guarantee the s

35、upply of labor protection products during construction. 5.5.3.2 improve staff food supply standards. 5.5.3.3 staff quarters are equipped with heating facilities to purchase heating boilers. 5.6 winter construction safety measures 5.6.1 fire safety measures 5.6.1.1 construction site an

36、d living area are strictly prohibited from private automatic fire. 5.6.1.2 establish a winter fire safety leading group, responsibility to people at any time check, put an end to fire. 5.6.1.3 formulate safety fire emergency plan, and site construction personnel safety education, clear fire em

37、ergency measures. 5.6.1.4 construction site and living area to purchase fire equipment, safety education for the construction staff, the use of fire control facilities. 5.6.1.5 oxygen, acetylene bottles and other flammable and explosive materials, away from fire storage. 5.6.1.6 constructio

38、n site and living area heating, fire, special care to prevent fire and carbon monoxide poisoning. 5.6.2 construction site and living areas are prohibited unauthorized use of electrical heating. 5.6.3 climbing and mechanical work before the construction of special arrangements to clean up the s

39、cene, the operating surface frost, snow and ice floes clean, you can carry out construction. 5.6.4 regular inspection of equipment, found hidden trouble in a timely manner rectification. 5.6.5 field wind over 5 stop lifting operation. 0 | share: reading (255) | comments (0) | references (0) |

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