First, the project overview:
The total height of the chimney is 50 meters, and the upper diameter is 1.4 meters. The cylinder is made of Mu7.5 mechanism ordinary clay brick and m5.O cement mixed mortar. The chimney lining is made of Mu7.5 mechanism ordinary clay brick and m5.0 cement mixed mortar. The concrete strength of the chimney wall is C2O.
Second, the chimney construction plan:
(1) Construction of brick chimney without scaffolding inside the pole. There is no scaffolding inner lever operation console. The operation console is made of steel pipe inserted in the wall of the cylinder and the upper deck is made of scaffolding. After each step is completed, the plunger is replaced once, and the console is moved up one step.
1. The inner rod is made of 8 steel pipes of φ73 and φ60, and each set has a small set of 4 telescopic inserts. When moving the console up one time, only one set of plungers is installed, to be built to the appropriate height, the second set of plungers is installed, then the lower scaffolds are moved up, and then the first set of plungers below is removed for movement Use it to the upper level. It is advisable to insert the rod into the wall about 10CM, not too tight or too loose, so as to ensure safety and easy disassembly.
2. Safety net frame, safety net bracket is made of light steel, and the bracket spacing is about 1M. The safety net is woven with nylon rope, and the outer diameter of the chimney is changed. Generally, the outer net ladder can be used to tighten the safety net support with the steel wire rope, and the safety net frame is lifted upward with the operation platform.
3. The lifting ladder and the hanging ladder are used to move the plunger and the scaffolding board, and the operator uses the lifting ladder to hang the lifting ladder on the upper layer of the inserted pole, and the safety belt is placed on the hanging ladder board. Standing on the elevator platform.
4, ladder ladder, the operator from the ladder up and down, for safety reasons, the ladder is full height with wooden poles or square wood tied fence.
(2) Using the outer derrick to load: The unloading platform lifted by the reverse chain is attached to the derrick, and the position is often kept slightly higher than the masonry working surface, and the labor of moving the small hoisting frame on the inner rod is reduced.
Third, construction technology and quality control (a), the foundation:
1. After the foundation pit of the chimney foundation is dug, the foundation pile (ie, the center point of the chimney) should be measured first, and then the construction unit should check the coordinates of the center of the foundation pit with the design of the construction unit, and whether the base size and elevation are consistent. The design requirements, whether the foundation soil quality meets the design data used in the design, and handles the hidden project visa means.
2. The base surface should be flat. It is strictly forbidden to fill the bottom surface of the foundation pit by filling the soil. In some places below the design elevation and low pouring, it can be leveled when pouring the cushion.
3. After the foundation pit is accepted, the foundation construction should be carried out immediately.
4. Insert the longitudinal steel bars in the wall of the foundation cup, and find the location, grouping and insertion depth required by the design, accurately bind the base steel bars or weld firmly, and prevent the displacement of the steel bars.
5. The foundation concrete should be poured once in a row, and no construction joints should be left. When there is indeed difficulty in completing a pouring, the relevant department of the contract may determine the location of the indwelling construction according to the actual situation.
6. After the foundation is completed, the basic acceptance and backfilling of the foundation pit should be carried out immediately. The backfill should be layered and carefully compacted. The thickness of each layer is not more than 200mm. The backfill is slightly higher than the ground to facilitate drainage. After backfilling, the slope should not be less than 2%.
(2) Brick chimney:
1. The clay bricks laid on the outer surface of the cylinder body should be crack-free first, and the edges and corners should be at least one end intact. When the chimney is constructed at normal temperature, the brick should be watered 1-2 days in advance, and the moisture content is Announced at 10%-15%.
2. Before laying the barrel, check whether the basic part has passed the acceptance check of the relevant department. At the same time, check the unevenness of the upper surface of the foundation part. The horizontal deviation should not exceed 20mm. Use 1:2 cement mortar to level, the leveling thickness is greater than At 30 mm, it is necessary to level with a fine stone slab (the strength level is one level higher than the brick strength level).
3. The mortar strength grade for masonry should meet the design requirements. The weight ratio should be used during construction. The consistency of the mortar should be 80-100mm. The mortar should be used with the mixing. The cement mixed mortar must be used within 4 hours after the mixing.
4. The barrel body should be made of bricks. When the thickness of the tube wall is more than 1/2, the inner and outer layers can use half bricks, but the number must not exceed 30% of the number of bricks per day, and bricks smaller than 1/2 bricks should not be used. .
5. The wall of the tube should be built by the slurry method or the slurry method. The brick joint must be filled with mortar. The fullness of the horizontal gray joint should not be lower than 80%. It is strictly forbidden to use water to grout and grout, and the outer brick gap of the barrel should be used. With seams, the internal gray seams should be flat.
6. Brick joints, the vertical loop joints on the lower layer of bricks should be staggered 1/2 bricks, and the radial joints should be staggered 1/4 brick. The vertical gray joint width and horizontal gray joint thickness of the masonry should be 10mm, on the masonry surface of 5m2. On the top of the spot check, only 5 of the thickness of the gray seam is allowed to increase by 5 mm.
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