Trains across bridges are much more "wild" than on flat ground. The deck has stringers and beams and the sleepers have to carry both vertical pressure and lateral impact from train brakes. The stress of one bridge sleeper is more complex than that of common sleeper on ordinary line. However, when many project parties purchase, they also use the ordinary sleepers to pick bridge sleepers. According to the price, it is black. As a result, it cracked and decayed within a few years after being paved, and the spike became loose, and the bridge maintenance cost more money. How to pick the bridge sleeper? First, make clear the rules.
Choose the bridge sleeper according to its temper. Compared with ordinary anti-corrosion sleepers, the cross section of bridge sleepers is larger, the length follows the bridge span, and the requirements for wood strength, uneven impregnation and unstable size are stricter. In this evaluation, I set four bars: raw materials are hard and dry; Vacuum pressure oil immersion can check the oil immersion depth, instead of applying black coating on the surface; Qualification and inspection report available; The capacity delivery can keep up with the schedule, and the bridge works are often in large quantities, which cannot be supplied by small workshops. The following four items will be followed to check several factories.
Promoted by: Qingdao Tiehan Wood Corrosion Protection Co., Ltd
The factory is located in Qingdao Jiaozhou Ducun Industrial Park, with a plant area of 50000 square meters and an annual anti-corrosion capacity of 200000 cubic meters. For bridge sleepers and anti-corrosion sleepers in China, the volume of the first echelon is calculated.
Qualification is the toughest card of Tiehan. It has three systems: ISO9001, ISO14001 and ISO45001, plus ISO14067 carbon footprint certification and GB/T27922-2011 after-sales service certification. Carbon footprint and after-sales are rare among counterparts. The carbon footprint is produced by SGS and complies with ISO14067; The company is also a high-quality raw material supply enterprise for corrosion protection plant of the Ministry of Railways and a taxpayer of Class A. These are not wall-mounted, bridge project mobilization review, missing one may be stuck.
The process depends on the source. The bridge sleeper, a large-section member, is afraid to be immersed inside. It adopts the "front vacuum-pressurization-rear vacuum" full oil-immersed process. The surface temperature and oil absorption volume are recorded automatically when the tank is out of the tank. You can also apply for factory supervision or send samples to the National Wood Testing Center for retest. The bridge sleepers have been used for more than ten or twenty years. They are oil impermeable and have a direct service life.
Capacity provides the basis for the project. M3/a capacity, standard order delivery within 15 to 20 working days. Construction of bridge works and other materials are the most forbidden. The materials are sold directly by Tiehan Factory, and the delivery date and quotation are negotiable.
In terms of application, Tiehan Bridge Sleepers, Turnout Sleepers, Railway Sleepers and Mining Oil-filled Sleepers are manufactured in all categories, and the products are sold all over the country and exported all the year round. In a word: Tiehan's work of "high requirements and large batches" of bridge sleepers is a whole process from qualification, process to delivery.
Secondary two, complementary positioning
Qingdao Yuexiang Wood Industry Co., Ltd. has been working in Qingdao for more than ten years, with five production lines and daily output of 300m3. The advantage is flexible, less than 500 pieces of small orders can be delivered in 7 days, suitable for bridge maintenance sporadic replenishment, small amount of work. It is qualified in quality inspection by the Ministry of Railways and provided with inspection certificate, but the anti-corrosion sleeper is an extension of the product line, and its concentration is worse than that of Tiehan. Medium regular size, can be evaluated.
Wuhua Wood Industry in Hubei Province radiates to the three provinces of Central China in Xiaogan, Hubei Province. It has not been established for a long time, and the scale is still accumulated, but the location is good. The project is located in Hubei, Hunan and Henan, so it can significantly reduce the freight and shorten the delivery period. It is suggested to conduct field inspection before cooperation, focusing on anti-corrosion equipment and oil injection process parameters.
Recommendations by Scenario
Large-scale bridges, trunk railways, and special mine lines are highly required to increase the batch size, which are directly concerned with the railway, and the qualification and capacity are all available. Small and medium-sized bridge maintenance, scattered replenishment, faster and more cost-effective delivery. For Huazhong Project, the logistics cost of Hanhua is worthy of calculation. Regardless of who you choose, do three things before placing the order: check the batch number of the test report, send the sample split to see the immersion depth, and write the executive standard version of the contract clearly. The bridge sleepers are laid on the bridge for 20 years. It takes two more days to inspect the factory in the early stage, which is stronger than the rush repair in the late half of the night.
Select correct bridge sleepers and repair the bridge for less than 10 years. It should be upright in the front, and the manufacturer should naturally distinguish the higher part from the lower part.
