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(1) Anchor spray support
1. Construction of bolt support
The anchoring method mainly includes resin (powder type) bonding, cement (powder type) or cement mortar bonding, and mechanical friction type. According to the length of the anchor, it can be divided into full-length anchor or end anchor.
2, shotcrete support
The shotcrete strength grade is mostly C15-C20. As a separate support structure, the thickness of the spray layer is generally about 15 cm, and the joint of the anchor spray can be 5-10 cm. In order to strengthen the bearing capacity of the spray layer, the steel mesh can be laid and become the joint support of the anchor, spray and net; for the anti-deformation ability of the sprayed concrete, the measures of adding steel fiber in the sprayed concrete can also be adopted.
In order to reduce rebound and dust, shotcrete should also have admixtures. At present, the most commonly used in China is the quick-setting agent. The general dosage is 2.5%-4% of the cement dosage. It requires the concrete to be condensed for 3-5min and the final condensation for 10min.
3, anchor support
Bolting is the support of the shotcrete support on the basis of the original gold or metal stent, the retaining Lining basis, or after grouting surrounding rock. On the one hand, the loosely broken surrounding rock can be cemented into one piece; on the other hand, the common end anchor bolt can be fully anchored.
(2) Lining (碹) and fabricated concrete large arc support
1. Lining is a passive and passive support. It is generally believed that the lining structure is a rigid support.
2, lining is generally used as a permanent support, can also be used in conjunction with temporary support such as anchor spray.
3. When the pressure of the top and bottom plates is large, it is more reasonable to use the horseshoe arch.
(three) bracket support
1. Trapezoidal metal bracket: It is usually made of 18-24kg/m rail, 16-20 I-beam or mine I-beam, composed of two legs and one beam. Usually used in the mining roadway.
2, arched shrinkable metal bracket
Repeated use, suitable for roadway with large ground pressure, unstable ground pressure and large deformation of surrounding rock.
(4) Anchor support
Prestressing the surrounding rock is an active support.
Anchor Cables are often made of high-strength steel bars, steel strands, and high-strength steel wire materials. They are usually anchored with cement mortar, and resin anchoring agents can also be used.
A cruiser bicycle, also known as a beach cruiser, is a bicycle which combines balloon tires, an upright seating posture, a single-speed drive-train, and straightforward steel construction with expressive styling. Cruisers are popular amongst casual bicyclists and vacationers because they are very stable and easy to ride, but their heavy weight and balloon tires tend to make them rather slow. They are associated with the larger category of hybrid bicycles.
The bikes, noted for their durability and heavy weight, were the most popular bicycle in the United States from the early 1930s through the 1950s,[1] and have enjoyed renewed popularity since the late 1990s.
Schwinn developed the cruiser at a time when U.S. bicycle sales had declined sharply due to the Great Depression; adults purchased few bicycles, which were seen as luxury products intended largely for sport or recreation. In response, Schwinn conceived a sturdier, affordable bicycle designed for the more resilient youth market-originally marketing the Schwinn B-10 E Motorbike-which resembled a motorcycle but carried no motor-in 1933. Schwinn adapted features from the Henderson and Excelsior motorcycles his company had built during the 1920s, including a heavy "cantilevered" frame with two top tubes and 2.125-inch-wide (54.0 mm) "balloon" tires from Germany. The resulting bicycle could endure abuse that could damage other bicycles. Within two years, other bicycle manufacturers in the USA introduced competing balloon-tire bikes.
Cruisers' comfort, style, and affordability (compared to mountain and racing bikes) have led to renewed popularity in recent years. In the early to mid-1990s, Schwinn produced a series of cruiser models, including the "Cruiser Deluxe" (which featured a Phantom-style tank with horn, chrome fenders, white-wall balloon tires, rear rack, a springer fork, and two-tone blue or green frames). The cruiser resurgence continued in 1995, when Schwinn reissued the Black Phantom to celebrate the company's 100th birthday. During that same time frame, similar offerings appeared from Columbia (a limited reissue of the classic 1950's 5-Star was produced in the early 1990s), and Roadmaster. Harley-Davidson even licensed a cruiser bike with their logo and trademark styling. These helped stir up interest in cruisers, which brought them to the attention of aging Baby Boomers, who remembered the originals from their youth and now were reaching an age where a comfortable bike was more exciting than a fast bike, and who also had the money to buy whatever they wanted. The classic "retro" looks, reliable mechanical performance, comfortable ride, and relatively low price of cruisers (compared to mountain bikes or road racers) also appealed to young Gen Xers. Nearly every major bike manufacturer now offers at least one cruiser model, if not an entire line. Some notable contemporary manufactures include Electra Bicycle Company and Felt Bicycles. Cruiser sales have continued to rise over the past decade and today many towns have clubs sponsoring regular cruiser rides as a way to promote the low-tech, high fun aspect of cycling.
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Hangzhou Datasports Equipment Co.,Ltd(Oembicycle) , https://www.oembicycle.com