Most of the items in the quality standard MM and above can be achieved. The axis deviation is not more than 2MM, and the bolt deviation is not more than 2MM. The difficulty is relatively large. Since there is no unified standard in China, we can only refer to other projects. Construction method The boiler room is a steel structure factory. All equipment and maintenance structures are connected by high-strength bolts. The foundation bolts adopt a one-time pre-buried process with high quality requirements and difficult construction.
The basic elevation without the tie beam is controlled at the bottom elevation of the steel frame, and the cheap steel frame is directly aligned. Each base is equipped with ME10/1010 iron pieces for steel frame fixing. The elevation of the steel frame before the position is placed: after the foundation is demolished, the elevations are respectively placed on the four fast iron parts, and the lead oil is embedded on the embedded parts, and simultaneously drawn on the drawings. In order to facilitate the construction and ensure the quality, the earthwork before the construction is backfilled to ―3 meters or more. The rectangular column base unit is a group of two axes, which is carried out from the back of the furnace to the front of the furnace. Check the diagonal distance in addition to the horizontal distance.
On-site installation: According to the horizontal and vertical axes and elevations given by the measurement, the steel frame and bolts are assembled on the ground and then hung to the corresponding foundation, and the alignment is made to align the center line of the steel frame with the center line on the foundation, and at the same time check the steel frame and bolts. Verticality, and elevation. The upper threaded end of the bolt is protected by a manufacturer's protective cover. The positioning plate provided by the manufacturer does not consider the venting hole when pouring concrete, and opens the 300*300MM square hole in the middle of the positioning plate. In terms of measurement, it is necessary to use a qualified control network. The test instrument that has passed the inspection by the statutory department is to be corrected by the height difference, temperature, ruler length and tension. The direction of the ruler is perpendicular or parallel to the measured direction.
The height of each bolt is inspected by a spirit level and is generally raised by 10 than the design elevation. Due to various factors, the verticality of the bolt cannot be checked by the theodolite. The verticality of the part above the positioning plate is checked by the line drop, the level ruler, and the frame is adopted later. The level is checked for precision. Concrete pouring: Some bolts have larger positioning plates at lower part, and the lower concrete is not easy to be compacted. It is divided into two layers, and the bottom layer is poured above the positioning plate. 200. When the initial setting is approached, the concrete is further vibrated and then poured. Do not fill up once or ash on one side to prevent excessive impact and side pressure on the bolts and steel frame.
Tests have shown that the use of steel frame fixing, the positioning plate control scheme is effective. Boiler pre-embedded bolts have been qualified for one pass. The pre-embedded bolt is an important link before the installation of the steel frame of the boiler. The correct position of the pre-embedded bolt directly affects the correctness of the installation. Therefore, the thought must be paid attention to, and the operation, inspection and acceptance must be taken seriously.
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