Anchorage for PC strand anchor

The characteristics of YJM anchors are as the following:

  1. Wide application: it is adaptable for stand with diameters of Φ’8, Φ’9, Φ’11, Φ’12.7, Φ’15.2 and Φ’18 with various strength from 1570Mpa to 2000Mpa as well as for high tensile steel wires with diameters of Φ’5, Φ’7 with the standard strength from 1570Mpa to 1860Mpa.
  2. YJM anchoring system is available for full range of tendon sizes (1-55 strands). In addition, our company can produce anchorages of any type of arbitrary holes in accordance with demands of customers.
  3. Good in terms of self-anchoring and easy operation;
  4. High anchoring efficiency factor, stable and reliable;
  5. Be capable of repetitive stretching and strong in terms of anti-interference capability.

(This article comes from Alibaba.com edit released)

Guide to the best rope to use for anchor systems on your boat

Hi Guys, there are a plethora of rope varieties that can be used on drum winches. Actually that’s one of the great things about drum winches! However not all ropes are created equal.

Now the first thing you should know is there are two basic categories in which most ropes can be classified, double braid and 3 strand. In the smaller diameters (6, 8, & 10mm) double braid is the preferred choice due to its high breaking strain and small diameter. Double braid is available with two different fibers, polyester or nylon.

Double braid polyester is a common choice due to its cheaper price, high breaking strain, UV rating, and abrasion resistance. However polyester lacks any stretch in the fibers, so if you are stretching polyester the fibers are actually being damaged. When using polyester anchor line a sacrificial nylon ‘top shot’ should be employed.

Double Braid Nylon is a great all around choice for its ability to stretch time and time again without damaging the fibers. The strength is similar to that of polyester with slightly lower abrasion resistance. Nylon has a high UV rating and is also around 30% more in price than polyester. Double Braid Nylon is the only anchor line LSM supply.

Next is three strand. Three strand anchor lines can be made from PP, Polyester, Poly Blend, Nylon, or natural fibers. The most common three strand today is PP, and although good PP is very nice hand anchor line there is little if any left around today. Most PP is of the ‘cheap and nasty’ variety. Due to its relatively low breaking strain per diameter it is not an ideal anchor line in sizes less than 12mm and therefore not an ideal drum anchor winch line.

Three strand polyester or poly blend is a good cheap drum anchor winch line in the larger sizes. The price is a fraction of the cost of double braid yet in sizes over 10mm it has a relatively high breaking strain. 3 strand will also stretch a little given the ‘coiled nature’ of its assembly. So when 3 strand poly blend ‘stretches’ its not actually the fibers that are stretching, rather the coil tightening on itself. For the first part anyway. We do not recommend three strand under 10mm in size as the breaking strain is exponentially reduced and much lower than double braid counterparts.

Three strand Nylon is perhaps the ultimate in larger diameter anchor lines. Its tough, has a high amount of stretch, high UV rating and can be used for decades. Again however the advantages of three strand nylon start around the 12mm diameter mark. Three stand nylon is the anchor line of choice, just below double braid nylon, in larger vessels. Price for three strand nylon is similar to double braid polyester. Three strand nylon is also the preferred choice for many Windlass anchoring systems.

Dymeema. Now a lot of people confuse double braid with dyneema. Dyneema is the same sort of fiber braided fishing line is made from. Like double braid polyester dyneema has no stretch, so if using dyneema a shock absorbing ‘top shot’ must be used. Quality dyneema is very expensive, however it can be very beneficial for extending the drum capacity on your winch.

So how do you know what you are buying in anchor line? Well unfortunately it can be very difficult to tell the difference between anchor lines (see picture below), and this is where reputable dealers come in. You cannot fake a good reputation guys. Both Poly and Nylon can have any number or color of ‘flecks’, or it can be pure white, so colour or lack thereof is no indicator of fibre material. In both doubl ebraid and 3 strand Nylon is typically a little less shiny than polyester.

Note the image. The first two ropes on top are double braid nylon. The next two are double braid polyester. The three strand variety pictured is a quality PP, and finally the blue line at the bottom is 5mm AU made dyneema.

(This article comes from Lone Star Marine editor released)

Advantages of mutistrand anchor

Very high strength capacity: The strand anchor uses a number of 7-wire prestressing strands, Diameter mostly 0.6″ (15.2mm) .Other dimensions like 12.2mm,12.7mm,12.9mm,15.7mm.The more numbers per anchor, the bigger carrying capacity of the whole steel strand anchor. We can supply up to 61 strands per anchor, more strands and other diameter are also available upon request.

Free Length: Any multi-strand anchor length can be produced without joints. The strands can be transported and stored easily(anchors will be supplied coiled up), which is the only way for  installation in areas where there are clearance issues or bench width constraints.

Low dead weight: There is more load carrying capacity per same weight of strand anchors than solid bar.

Wide applications: With different painting, the steel strand anchor system can be used as temporary anchor and permanent anchor. Can be used with sheet pile tie cable, H beams, steel pipe as tieback anchors, removable anchor, deep foundation.

High quality: Stringent quality control of production is maintained because we will provide shop drawings for each multistrand anchors orders. Our factory production meets ASTM A-416 ASTM A882 etc.

Strand anchor system composition

stand

Features of Strand Anchor

IMG_4285_01_a2261a455d

Strand anchors consist of three main components: the anchor head, a steel tendon – divided into the bond section and free length – and the grout body.
The steel tendon is constructed from a number of 7-wire prestressing strands.

Features:

  • Nationally approved system with internal and external quality control
  • Can be closely matched to the required loads by selecting the number of strands, strand cross-section and steel grade
  • Longer anchor lengths can be produced without joints
  • Relatively low dead weight and small diameter
  • Ease of installation thanks to high anchor flexibility
  • Efficient to transport due to low space requirement for transport and storage (anchors are supplied coiled up)

(This article comes from ANP Systems GmbH editor released)