Rock Yuan

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So far Rock Yuan Admin has created 57 blog entries.
21 02, 2019

A Changsha girl fell in to the sewer without cover agin. We need to pay more attention to the installation of manhole covers in the city.

By |2019-02-25T18:33:13+00:00February 21st, 2019|Manhole Covers News|

In the stormy night, a 21 -year-old girl named Yanglijun from Shaoyang accidentally fell into a sewer without lid in Changsha City, then was swept away by rushing water, is still missing,even though the incident

21 02, 2019

The main road surface can not see the drainage covers in Japan

By |2019-02-25T18:34:05+00:00February 21st, 2019|Manhole Covers Culture|

Firstly arrived in Japan, people will be surprised to find that the main road and the main car road surface can not see the drainage covers in Japan Road. Driving on this road, you will

21 02, 2019

If sealed manhole covers can be used on sewer manhole in the city?

By |2019-02-25T18:34:56+00:00February 21st, 2019|Manhoe Covers Knowledge|

City sewer smell sometimes emerges, and some urban residents suggest if the sealed manhole covers are workable? They think if using sealed manhole covers, the odors will not come out from the sewer, and thus

21 02, 2019

Lockable Manhole Covers Have Too Many Lock Devices

By |2019-02-25T18:35:53+00:00February 21st, 2019|Manhoe Covers Knowledge|

Lockable Manhole covers have more than 100 anti-theft devices, mainly using six methods as follows: First: The coupling chains Second: The hinge connection Third: oral anti-spin technique method Fourth: bolt holes

21 02, 2019

How to Solve the Problem of Stolen Manhole Covers

By |2019-02-25T18:37:37+00:00February 21st, 2019|Manhole Covers Culture|

According to the recent news report from China’s Xinhua Agency, about “over 1,800,000 manhole covers were stolen in China in 2013. The number of missing manhole covers was more than 5,300,000pcs every year all over

21 02, 2019

How to look at the development of composite manhole covers?

By |2019-02-25T18:39:18+00:00February 21st, 2019|Manhoe Covers Knowledge|

How to look at the development of composite manhole covers? Composite materials manhole covers being used at present are roughly divided into five categories, which the five kinds of composite materials covers in use are

21 02, 2019

The introduction of Ductile iron manhole covers

By |2019-02-25T18:40:10+00:00February 21st, 2019|Manhoe Covers Knowledge|

Ductile iron manhole covers are one type of ductile iron products. Ductile iron obtained Spheroidal graphite through ball and bred deal, which effectively improves the mechanical properties of cast iron, especially improve the ductility and