As a result of its long-term use, its surface has been cracked (vertical and ring-to-sew) and its surface is severely corrosive, with local stripping and falling, with tilts on the upper part of the chimney, and the current condition of the chimney poses a serious threat to safe production. At the request of the construction unit, a comprehensive overhaul of the chimneys is being undertaken to consolidate the company's years of construction experience,*** which options are available to you。
Option i
1. Dismantling 10 m。
2 to replace 10 m with the original structure。
3 and 30 are reinforced。
4 . 30 m outside walls painted。
5. The outer wall is painted on buoy 30 m。
Installation of mine avoidance systems and decorative metal components for preservation。
Pre-construction preparation of chimneys for a full screening of chimneys for the removal of chimneys and the completion of the examination and inspection of the installation of exterior walls to paint the outer walls and the installation of anti-fouling ladder protection systems
Option two:
Pre-construction preparation of chimneys for a full screening of the chimney base for sewn chimneys and net-painting packs, long-stretching installation of exterior-painting shielding system overhaul of repainting ladders completed
V. Technical measures
1. Dismantlement and restoration works
1. 1 the removal of chimneys is carried out from the top to the bottom, starting with the opening of the “v” gap at the top of the chimney with steel, iron, steel, hammers, then the gradual removal along the “v” gap along the two sides, with the same method followed by the gradual removal by analogy。
1. 2 the removal of large blocks is prohibited from being pushed down, and must be broken into small blocks, weighing not more than 50 kg, and carried out with the permission of the surrounding site, where necessary, by putting the bricks down to the ground with a radle and pickers。
1. 3 upon completion of the dismantlement, call the site in time to prepare for restoration。
1. 4 before completing the chimney, check the overall verticality of the chimney, carry out the restoration work at 57. 5 mm vertically at its centre and gradually correct its centre error during the completion process。
1. 5 construction of a new steel concrete beam at the start of the re-establishment of the chimney in order to increase the overall strength of the chimney, and construction of an additional condensed steel beam at the top of the chimney to prevent cracking of the chimney during its long-term use。
1. 6 the construction of chimney bricks, the placement of rings to steel bars, the placement of vertical steel bars, and the installation of mine avoidance systems are carried out in strict compliance with the original design criteria。
Other sub-engineering
2. 1 the exterior wall of the chimney is painted with a pre-stamp steel plating and steel plume sewn into a “v” tank, the width and depth of which are determined by the depth of the crack and the favour of the sealing, after which a 1-2 mm epoxy (6101#) coating will be smoothed with a steel wire or compressed air to remove the dust from the inside of the tank, to prevent the appearance of air holes and ripples, and to be closed with 107 building glues with a 1:2 cement slurry and to keep the surface flat。
2. 2 discovery of chimney surfaces, cement slags, etc., is removed with tools such as wirebrushes, steel knives, etc., and surface dust is removed with brown brushes。
2. 3 stabilize the fence on the surface of the chimney with steel nails, which are made in the form of plumes, and make 3 cm of the chimney surface painted with a 1:2 cement slurry of 107 building glue, which should be even and flat, and be careful to maintain the thickness of the coating and the light of the surface。
2. 4 upon completion of the construction of the packs and bars from the perimeters of the chimneys, made of 60 x 6 flat steels, which are based on the perimeters of each of the chimneys, decomposed (two times the stain-proof bottoms painted and two times the silver flour painted), the lengths are distributed evenly by the lengths of the chimneys in eight rows, the wraps are prepared equally for each 100 mm, the bands are attached to the insides of the cages, and the bolts are strong with 20 reinforced bolts。
2. 5 when the base surface of the chimney contains more than 6% water, it is painted with a paint specific for the high-altitude structure of j86-7 cspv markings, from the top of the chimney down every 5 metres in red and white。
2. 6 the entire mine avoidance system, including detonators, wires, perimeters, etc., must be replaced immediately and *** its electrical resistance by ground is greater than 10 om。
2. 7 metal components outside the chimney,*** line deregulated, re-painted twice with stainproof base paint and twice with silver powder。
Vi. Construction methodology
This work was carried out using a scaffolding-free operating method。
1. The chimney removal is supplemented by the construction of two bundles of 50x5 flat steel, with 20 bolts connected to a tight chimney, with an even hole around it, with 50x5 horns made of steel, with 20 yuan steel, with 1,500 x 250 x 50 paneling on the rack, with a hanging rail and an affixed ***, on which the construction staff works。
2. When the previous phase of operations is completed, the railings, ann***, wooden slabs, etc., are removed and moved to the next section to carry out the work and, by analogy, the full demolition of the replacement works。
3. Construction is carried out using seat-tops, etc., for seams, exterior wall painting, installation, etc。
Vii.*** quality measures
1. Organize pre-construction studies and discussions on the construction programme for all construction personnel, detailing the construction content, quality requirements and care requirements, subject to a secondary inspection of the entry of raw materials, with product certification, quality certificates and test reports。
3. Divisional sub-engineering must have acceptance and inspection records and shift records。
4. Upon completion of the construction of the prior process, the construction of the lower process must be carried out after the construction unit has been certified and the project department has been informed of the problems in a timely manner and the project department has prepared a reorganization programme。
5. Preservative paints are carried out strictly in accordance with product specifications and the technical requirements of the product。
6. Under the supervision of a, the b-mensor shall monitor the construction throughout the process。
7. The introduction of a system of rewards and penalties aimed at quality engineering, and the introduction of each process, each chain, into the classes and individuals。
The construction was carried out in strict compliance with the guidelines for construction and inspection of chimneys, gbj78-86; for construction and quality of steel structures, gb50205-2001; for construction and inspection of buildings resistant to corrosion; gb50212-2002; and for construction and inspection of steel structures。
8. 1 wall dust and attachments within the chimney must be washed with high pressure water guns, and in order to increase the retention of the sand, 107 building glues are mixed into the sand。
8. 2 the outer gap shall be filled with clogged, the coating shall be applied to the plate and the surface shall be kept clean。
8. 3 the internal corrosive layer and buoy painting should be subject to the drying of the concrete surface, with a water content of 6 per cent at a depth of 20 mm and the cleaning of surface ash, oil stains, ash plasma, etc., which should not be less than 130m and the external coating should not be less than 150m。
8. 4 welding heights of steel structures shall take the thickness of the thin plate, which shall be full of welding, and welding shall not contain defects such as holes, scratches, asss, etc., and welding shall be based on e4303。
8. 5 the outer thickness of the surface coating of the steel structure is generally not less than 150um, and the rust standard shall be st3 level。
8. 6 the internal and external coatings shall be balanced, beautiful, unpaved, unpaved, unpaved, bubble-free, needle-free and unobvious wrinkles。
Establish a quality leadership group of project leaders as duty-bearers to create a “quality, safety” consciousness and enhance the quality of the entire staff *** of quality works。
