Construction of anchor bolts The basic bolts of this equipment are available in various types, with many varieties, various types of embedding, and high installation requirements (center deviation Zmm of direct buried bolts, verticality 1/100. Internal control standards for anchor plates and sleeves are: anchor plates) Center deviation lmm, level 1/1000, sleeve center deviation Zmm) and concentrated characteristics, 92% concentrated in the vicinity of the three sets of coilers.
In the foundation construction of the equipment, we grasped the control of the axis and the elevation, and ensured the quality of the foundation construction through the three main processes of measurement and positioning, bolt fixing and review and acceptance, so that the installation was successful. The measurement and positioning nine zones have complex structure, high elevation, high and low fluctuations (the top surface elevation is +1.Oom, the lowest is 5.85m, and the sedimentation tank is 10.sm). There are many convex and concave surfaces, many holes, and work. The characteristics of narrow surface and poor line of sight have been discussed with the measurement team of the headquarters several times and an independent bolt control network has been established.
The theodolite and level used are checked against the check, and different instrument error values ​​are corrected. The ruler must be used for the ruler. When positioning, it is taken from the coordinate network point or the center point of the frame. When measuring the distance, the distance is measured according to the tensile force specified by the verification, and the adjustment factors of the temperature difference and the height difference are considered. When the angle is measured, the average is measured by the theodolite and the counterclockwise secondary angle.
The measurement frame must be stable, the center point mark on it should be obvious, and the name should be marked. The inspection procedure for measurement positioning is: joint inspection by the team self-inspection branch re-examination bucket command. The procedures for bolting the mounting bolts and anchoring the bellows are generally: pre-preparation work (manufacturing, processing, sub-contracting, acceptance, etc.), pre-embedded iron parts~welding fixtures~line frame positioning platform ~Bolt installation adjustment ~ bolt reinforcement ~ review check.
The embedded iron parts are generally buried when the previous pouring is performed. In order to weld bolt holders or positioning platforms, etc. The fixing frame is used to adjust the bolt height and fixing bolt position; the wire frame determines the bolt position. Bolt installation First, use the theodolite to cast its center line onto each set of bolt wire racks, mark it, and take the vertical line method to determine the position of each bolt, and then according to different embedding forms, installation requirements, construction conditions, Use different fixing methods to install, adjust, and fix.
Installation method of direct-buried bolts: (1) According to the position of the bolts, fix the nuts with spot welding, install the screws, and measure the matching to determine the top level of the bolts. (2) Check and adjust the verticality with the level and the line drop, and temporarily fix it after passing the test. (3) Check the center line and the distance to each bolt, the diagonal line, etc. with a steel tape measure. After passing the test, fix the lower part of the bolt to the fixed frame. If it is unqualified, repeat the above steps to adjust and check to meet the requirements. (4) Bolt reinforcement method: Reinforced steel bars should be set when the center of the bolt is less than 40d from the silicon edge.
Casting steel type, channel steel anchor plate and sleeve installation method: (1) welding the short sleeve of the lower part of the anchor plate on the platform, checking the irrigation; (2) checking the elevation and flatness of the bracket, that is, roughly checking Anchor plate elevation; (3) Locating the anchor plate position, checking the fine-tuning bolts and position, temporarily fixing the anchor plate and measuring the elevation, and checking the direction of the long hole of the single anchor plate (perpendicular to the main rolling line). (4) Place the frame level on the surface of the anchor plate, and parallel to the side of the anchor plate, adjust the fine adjustment bolt on the bracket, the feeler fits the inspection level, the center is adjusted by the operator, and the fixed side is checked while adjusting. Adjust the other side perpendicular to it, and repeat it carefully, until the center of the anchor plate, the horizontality of the four sides of the surface (if there is an error to ensure at least the vertical direction of the two sides) meets the requirements.
Installation of thick steel plate anchor plate sleeve: The embedded parts are divided on the platform, and a circle as large as the sleeve is drawn, and two vertical center lines are drawn. Fix the embedded part on the stencil on the platform so that the wire frame coincides with the center line of the embedded part. The temporary spot welding sleeve is placed on the embedded part, and it is determined that the upper position is temporarily fixed. Use the level ruler and the wire hammer to check and adjust the verticality. After checking the center line of the wire frame, the sleeve and the embedded parts, and the dimensions are correct, the sleeve and the fixed frame are welded and fully embedded with the embedded parts. The sleeve is reinforced as before. Installation of pre-embedded bellows: The method is basically the same as direct-buried bolts. Generally, it is not necessary to set up a special fixing frame, and the original reinforcement of the equipment foundation is used to weld the auxiliary steel bar, and the upper and lower parts of the sleeve (the middle portion of the length greater than lm) can be spot-welded and fixed. When the quantity is concentrated and located in the protruding part, it is better to use the fixed frame form. The pre-buried method is adopted, the construction is simple, the construction period is short, the anchoring is good, the steel is saved, and the benefit is remarkable.
Checking and checking the semi-finished products of the anchor bolts and the uniformity of the testing tools: the anchor bolts have many types, many models, many bolts embedded in different forms, different materials and high installation requirements, and are specially managed and distributed by the special personnel. Review the long-distance, diameter, midpoint, and number of directly buried bolts, sleeves, and bellows, and check the verticality. Especially for the flatness and sub-point of the cast steel anchor plate, the personnel are inspected many times. Reliable requirements are not required to be returned or processed to ensure the accuracy of the installation of the anchor plate.
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