冬季施工方案 - lnlh2003的日志 - 网易博客（Winter construction program - lnlh2003's log - NetEase blog）

1、冬季施工方案 - lnlh2003的日志 - 网易博客（Winter construction program - lnlh2003s log - NetEase blog）Winter construction program - lnlh2003s Journal - NetEase blog, NetEase newsmicro-blogmailboxLightning mailAlbumadhere to principles of truth and rightMobile mailAn iconFantasyMore blogs, blogs, home pagesBlog top

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6、one (Figure) around us to see Taiwanese male white-collar Li Han Hong return to the mainland disaster on the road in a car accident hit kill more Why College StudentsField inspection report on temporary power consumption schemeWinter construction program construction 2009-06-24 13:45:08 read 255 rev

7、iew 0: big and small subscriptions5, winter construction plan5.1 after winter, manual excavation of bored piles, construction conditions have changed the following:After 5.1.1 enters the winter, the temperature drops, the ground produces the frozen layer construction, the excavation difficulty incre

8、ases.5.1.2 enters the water temperature is reduced after the winter, well point dewatering pipes, water supply pipe, water pump, easy of 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 constructi

9、on will be stopped in case of bad weather. After the resumption of work, measures such as on-site cleaning and other measures should 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 constructi

10、on measures.5.2.1 guarantee the construction quality measures of steel cage.The finished material and semi-finished 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 bef

11、ore the steel cage is hoisted. For semi-finished products, more cage, because of rain and snow and rust, rust removal 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

12、negative temperature welding of the steel bar, and the welder engaged in the welding of the steel bar must hold the 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

13、, electric shocks and fires. Before welding the steel bar, the welding shall be carried out according to the construction 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. Wh

14、en welding with negative temperature, the welding parameters should be adjusted so that the welding seam and heat affected 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 s

15、hall not be applied when ambient temperature is lower than 20 degrees centigrade.5.2.2 steel negative temperature arc welding scope: Steel less than 22mm in diameter with a welding: j506, steel electrode selection5.2.3 preparation before weldingBefore welding, the rust, slag and oil co

16、ntamination of the welding area of the reinforcing steel bar must be removed, and the distortion and bending of the end of the steel bar should be straightened or removed by . steel lap welding should use one side welding, can not carry out single side welding or double face welding.5.

17、2.4 welding processAccording to the steel grade, diameter, joint type and welding position, 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

18、 to prevent joint overheating. Welding process shall meet the following requirements: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). welding, the arc should begin in the end of the lap

19、bar, in the end should be reinforced lap arc crater shall be filled up. 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

20、 terminal position of welding seam, should be good fusion. After each layer 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 lap joints shall

21、 be no less than 0.3 steel bars; the width of welds shall be no less than 0.7, and the diameter of the steel bars shall be no less than .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

22、 of the shortened 4 - 6mm.5.2.5 quality acceptance 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

23、 each of the 300 joints visual inspection: 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

24、 shall not exceed the specified value. The appearance of unqualified joints, after modification or reinforcement, can be submitted for the two acceptance.5.2.6 connector notesWhen the steel bar is welded, the welded joints arranged in the same steel cage shall be staggered. In the range of 35 times

25、of the diameter of the reinforcing bar (no 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 measures5.3.1 construction, for individual prone to collapse of the

26、pile, the use of large displacement 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 transit

27、ions. Prevent the pipe from freezing and cracking.5.4 ensure the quality of perfusion construction5.4.1 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 waitin

28、g time of the tanker with 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 tim

29、e, and a special pipe 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 backfi

30、lling, filling 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 measures5.5.1 construction site to take measures to keep people warm construction site will set up 3 movable rooms, with boilers for the on-site construct

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

32、 ensure the construction efficiency. equipment operating units increased nuanpeng. construction of vulnerable parts, pipelines, tools must be in stock, the construction site pipeline leakage, timely replacement. machines ready to be put into site operation shall be replaced with

33、 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 guarantee the supply of labor protection products dur

34、ing construction. improve staff food supply standards. staff quarters are equipped with heating facilities to purchase heating boilers.5.6 winter construction safety measures5.6.1 fire safety measures construction site and living area are strictly prohibited from private automat

35、ic fire. establish a winter fire safety leading group, responsibility to people at any time check, put an end to fire. formulate safety fire emergency plan, and site construction personnel safety education, clear fire emergency measures. construction site and living area to purc

36、hase fire equipment, safety education for the construction staff, the use of fire control facilities. oxygen, acetylene bottles and other flammable and explosive materials, away from fire storage. construction 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