Demolition of chimney in new company

I. General situation and characteristics of the project

This project is the chimney overhaul project of the seventh cotton mill in Shijiazhuang. The chimney of this project is 50m high, and the outlet is a brick chimney with a diameter of1.7m.

This project is a high-rise building with high height, great difficulty, high technical requirements and complex construction technology. However, our company has a group of professional chimney construction teams with rich theoretical and practical experience who can fight hard, and both management and construction technology can meet the needs of this project.

Ⅱ. Construction objectives

1. Duration: The total calendar duration of Scheme 1 is 45 sunny days, and all engineering quantities are completed; The total calendar duration of Scheme II is 25 sunny days, and all the quantities are completed.

2. Quality objective: the qualified rate of sub-item acceptance 100%, the excellent and good rate ≥95%, and the engineering impression ≥90%.

3. Cost objective: ensure the quality and safety of the project, and plan to save the project cost 17% through effective management means.

4. Safety objective: adhere to the policy of "safety chimney painting first, prevention first", ensure that the frequency of general accidents is less than 1.5‰, the mortality rate is zero, and put an end to major safety accidents.

5. Environmental protection goal of civilized construction: strengthen the scientific management of the construction site, meet environmental protection requirements, establish the image of humanistic engineering, and create a municipal civilized construction site.

6. Scientific and technological progress goal: this project is listed as a professional scientific and technological demonstration project of this enterprise, and the benefit rate of scientific and technological progress reaches 1.5‰.

7. Service objective: establish the owner to meet the construction process and track the project quality for five years.

Ⅲ. Construction deployment

1, main construction technology

1. 1 adopts footless overhead suspension structure.

Ⅳ. Main construction contents:

Option 1:

1, construction process

Tool preparation → entrance protection → inspection of ladders → removal of upper 20m→ fabrication of ring beams → erection of 20m→ installation of ladders → installation of lightning protection facilities on chimneys → clearing.

2. Dismantle the chimney manually, and paint it except the upper part of the chimney 20m.

3. Make a ring beam at 30 meters.

4. The chimney is 30 meters upward and 20 meters upward; ; Height every 50cm build by laying bricks or stones a reinforced brick (about 40); There is a vertical bar (about 12) every 80cm in circumference, and the bars are all 0.8 Ф yuan steel. The construction technology of 20M masonry in the upper part of chimney meets the requirements of 7-level earthquake resistance.

5. A 20m ladder should be installed on the outer wall of the chimney.