1. BTC (buttress thread coupling) trapezoidal thread coupling is an API standard thread connection type, which is commonly used in the connection of petrochemical pipes or tools, such as floating collar, guide shoe and pipe shoe used in cementing operation. The pitch is 8 teeth per inch and the tooth height is 1-1.2 mm. The external thread part 1 is designed with - 15 ° The end face shoulder 4 is connected with - 15 of internal thread part 2 after tightening ° Internal torque shoulder interference fit, after the internal and external threaded parts are tightened, at least one circle of threads closely fit, the top surface of thread teeth of threaded parts is parallel to the oil pipe axis, and the inner diameter D2 of internal thread 2 is approximately the same as that of external thread 1. Trapezoidal thread has excellent sealing performance, high connection strength and good anti torque make-up ability, so it can be used as an alternative to thickened thread or replace thickened thread in practical engineering
2. The number defined for the axis
is represented by Arabic numerals or English letters with a circle
the axis number is shown in Arabic numerals from left to right on the drawing; It is indicated in English letters from bottom to top
the diameter of the shaft number is generally 8 mm, which is 10 mm in the detail drawing
I wish you a happy job.
3. It is a positioning axis set for the convenience of the drawing, which can clearly indicate the position of each beam wall slab column, such as column, 1-intersection f axis column, 1-2 intersection f axis beam or wall, 2-3 axis intersection E-F axis plate, etc. the axis plays the role of positioning
4. The first 1 is the number, XX is the location, the job number is the month of drawing, and the semicolon is the number of drawing. The drawing standards of each company are different. If you want to know the company law that gives you the drawing, you can consult their company drawing standards
5. 1. It means a hole. It could be a trash outlet or a cable well
2
3. Floor drain
4. There are height difference lines between indoor and balcony floor.
6. The number of the blueprint is the ID number of the drawing, which is automatically generated by the system according to the arrangement order of the frame. The number marked below the index sign is the corresponding drawing number:
7. WL is water surface elevation
BL pool bottom elevation
FL ground elevation
TW wall top elevation
SL soil surface elevation
other common notes:
PA planting area
FF indoor floor elevation
FG outdoor soft landscape finished surface elevation
BC road edge bottom elevation
BS step bottom elevation
< H2 > extended data
construction drawing, It refers to the general layout of the project, the external shape, internal layout, structural structure, internal and external decoration, material method, equipment and construction requirements of buildings and structures
construction drawings can be divided into architectural construction drawings, structural construction drawings, hydropower construction drawings, etc; The construction drawing is mainly composed of frame, plan and elevation, detail drawing, compass, legend, scale and other parts. At present, the drawing method of construction drawing in China has become mature
< H2 > reference construction drawings_ Network
