Main completion units: Hebi Mining Bureau, Shanghai Coal Mine Design Institute, and Beijing Jianjing Research Institute of Coal Science Research Institute. Starting and ending time: August 1958-1959 12. Appraisal time: October 1959, appraisal unit: Hebi Mining Bureau and Coal Science Research Institute..

Derrick is the main ground structure used for lifting the wellbore, which used to be a steel structure and required a large amount of steel. The use of cast-in-place reinforced concrete wellhead can save steel, but it is bulky and has a long construction period, which affects the early lifting of the wellhead. Prefabricated prestressed reinforced concrete wellhead has good crack resistance stability, can increase the stiffness and durability of the structure, and extend its service life. Its successful development not only saves steel and wood, shortens the construction period, but also fills a gap in the wellhead..

Amplitude (mm) 059.

Frequency (times/min) 350.

Amplitude (mm) 0.45.

Frequency (r/min) 155.

The stiffness reaches the level of the steel mast at the same height.

1. The form of the well frame adopts a combination of street frame and frame, that is, two sided truss and two sided frame, to ensure that the overall rigidity of the well frame reaches the level of the steel well frame at the same height;.

2. Canceling the inclined frame can simplify production and installation, save materials, and facilitate the arrangement of wellhead transportation;.

3. The installation of the mast column on the locking plate can eliminate the influence of uneven soil settlement;.

4. The prestressing method for the components of the mast can be achieved by using both pre tensioning and post tensioning methods depending on the production conditions and usage requirements;.

5. The composition of components, from the perspective of ensuring the stiffness of the well frame and facilitating production and installation, can be prefabricated in whole pieces or sections;.

6. The cross-section of each component is: 4 columns 300 x 300mm, top beams 250 x 500m, 250 x 600mm, frame beams 250 x 400mm, and chair frame members 250 x 250mm. The conditions for use are that the height of the wellhead is within 18m, the diameter of the well is within 6m, and the lifting capacity does not exceed 2t cage well,.

2. Save materials, saving 55-70% of steel compared to the same type of steel well frame, and 30-40% of steel and cement compared to ordinary reinforced concrete well frame;.

Plate Anchor

4. Shortened the time occupied by the construction of ordinary reinforced concrete wellhead. Appraisal opinion: It can be promoted and used in places with conditions..