This paper describes 3 typical accidents of contrac-tors onsite construction operation in petrochemical plants,and points out the existing construction operation problems in petrochemical plant area: the ability of contractors is not good,the owner lacks standardized management for the contractors,and management authority of the owner department in charge of construction operation is weakened.

The construction technologies of single bucket excavator using forth and backhoe digging construction methods are introduced.

The key points of the permanent way work in 1998 are to raise train speeds on the existing lines, strengthen the upgrading of the equipment of the tracks and bridges on the Beijing-Guangzhou line, speed up the construction mechanization and quicken the pace of scientific enterprise management.

The construction quality control of low temperature rapid hardening durable concrete;

Brief discussion of the construction quality management for decoration engineering and its controlling;

The application of fuzzy synthetic evaluation in construction quality assessment;

When sprayed on concrete surface,a gel-like silicate was formed to fill in concrete surface for hardening so that surface cracks were prevented or reduced which was effective on improving concrete strength,impermeability and wearability,speeding constructional work and ensuring constructional quality and durability.

The older codes for construction and acceptance can not be satisfactory to the necessary of controlling the constructional quality.

According to 《Unified standard for constructional quality acceptance of building engineering》 GB 50300 2001concerning provision,some viewpoint is put forward to discussion on the strength interval under given confidence level for 《Technical specification for testing concrete strength with drilled core》 CECS03:2007.