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SF-C-type curing agent concrete mold release


Air supply shallow mining methods for mining; With the increase of mining depth, the air will continue to extend the pipeline for the wind efficiency is reduced. Mine is a good seat mining 4O years of mine, for the wind in the way of using ground concentration level for the wind on a 350m course. Loss of air flow piping up to 2O%, about 3.71 million the year rn loss of air flow in pipeline. February of this year, the mine installed using a 3 mobile downhole pressure blower unattended, because devices are small, with no fixed base, directly installed in the mine tunnel, the realization of a nearby air supply. Line loss of only 4.4%. And the device power-saving effect is obvious, since the operation has been compared to ground equipment, the monthly saving 1O. 25 million kW ・ h, annual electricity savings of 492,000 yuan. In addition, the device is simple, advanced technology, is a maintenance-free product, without staff on-site duty, thus reducing the labor positions of 13, annual savings of maintenance and salary costs 15 million. (Zhou Feng) SF-C-type curing concrete mold release agents Beijing Urban Construction Engineering Research Institute recently developed a new type of environmentally friendly building materials - SF-C-type curing concrete mold release agent (is a national initiative). Its biggest feature is a dual-use, traditional concrete construction in the stripping process and maintenance of two simplified one. The use of the product can reduce material costs, but also reduce labor costs. (CCB) 3 new horizontal directional drilling, according to navigation (Tunne ~ & Tunnel [ingInternational} 2003 No. 1 reported, Vermeer company recently launched 3 new horizontal directional drilling rig of navigation, the back force of 109 ~ 363kN. 1380 × 120 which type of pullback force of 363kN. is D80 × 100 machines based on the improved form,[link widoczny dla zalogowanych], the rotation torque increased 2O%, to 16000N ・ m. 3 种 navigation features of horizontal directional drilling rack and pinion drive system is more stable and stronger with the performance. drive system specially designed so that the three kinds of navigation horizontal directional drilling to maintain a narrow path. D80 × 120 Navigator horizontal directional drilling machine is equipped with a table 757L / min random hole pump, and a flow indicator and pump monitoring systems. New D33 × 44 Navigator horizontal directional drilling back to force 150kN, torque 6000N ・ rll, is a powerful, medium-sized machinery, can be used for medium-and long diameter hole drilling, including through the highway, river; There are 3 changes of geological conditions for drilling speed and the back reaming when selected. is the smallest compact D24 × 33 type, torque 4468N ・ m, back to force 109kN, body very narrow, but the strength to fully achieve the level of urban area drilling requirements. (Evergreen) (Ling Qin Rao of Technical Editor) (Continued from page 42) 4 application results (1) through small error high accuracy. a new set of 450m track down a mine in May 1999 started the same year, the smooth l0 30 Shek Mun through with a 550m track, through the total distance of more than l700 m, through the level of deviation 21ram, elevation error only 3ram, accuracy, respectively,[link widoczny dla zalogowanych], than the \Blasting spot position may be based on layout embrasure face,[link widoczny dla zalogowanych], hand rake bucket machine can clean floor beams, the construction may be based on the beam laying pin tract, spray hand spray according to the beam to tunnel into the Lane, the construction is very convenient. (3) hanging midline and the degree of waist saves time and effort to improve its ergonomics. laser beam not only gives the direction of tunnel excavation, but also gives the slope of the roadway to save the construction of the center line and the degree hanging waist of time and manpower to speed up the tunneling rate, improve its ergonomics. (4) help improve the quality of construction. Calibration of a laser point to waist, linked to the center line and eliminate a number of error degrees waist, and construction personnel may at any time for inspection. timely detection and correction Heading deviations, thereby improving the quality of the roadway construction. The quality standards of roadway engineering rate of 100%, 86.7% excellent or good. Author Zhanjia Min (1957 a),[link widoczny dla zalogowanych], male, college degrees,[link widoczny dla zalogowanych], senior engineer of Surveying and Mapping. are engaged in teaching and research work, has published many articles.
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