Small polyester round slings can easily lift 6000tons of reinforced concrete ‘Big Mac’

The world-famous super-engineering Hong Kong-Zhuhai-Macao Bridge is opening to traffic. The construction of the bridge has created the world’s longest:the world’s longest sea-crossing bridge; the world’s largest engineering and most technically challenging artificial island; the world’s longest and deepest sinking pipe tunnel.

The final joint of the Hong Kong-Zhuhai-Macao Bridge Cross-Harbour Tunnel is to lift a 6000tons reinforced concrete “Big Mac” joint, then install to the same leght of space at depth of 28 meters in the sea, stuck in like a wedge, just like ‘thread a needle in the sea’.   In this project, the high-strength polyester round slings made a great important role in lifting reinforced concrete.  

lifting 6000T big mac

Hight strength polyester round slings are comparable to steel wire rope, but lighter than steel wire rope. Due to the superior properties such as light weight, softness, no damage to the object, safety and non-conductivity, corrosion resistance, and high cost performance. Based on the characteristics of above. In the docking work, there are four round slings with each loading capacity 900tons, and consist of more than 130,000 high-strengh fiber filaments. Each about 120meters length and 40cm in diameter. Under the lifting of the crane, the “Big Mac” connector was smoothly placed in the designated position, that means the main project of the Hong Kong-Zhuhai-Macao Bridge will soon be completed.

lifting slings

So, what is the polyester round sling? Why is there such a power? Let’s talk about the mystery!

Polyester round sling is made of hihg strength polyester industrial yarn, inner fiber core forms circular shape in endless rounding,  and outer covered with sleeve of polyester.  Usually round sling choose polyester yarn with  1100dtex-6600dtex. The biggest characteristic of this type of product is high breaking strength and relatively small elongation at break.

The advantage of polyester round sling:

  • Light weight, easy to use, low elongation.
  • Lifting smoothly and security.
  • Soft surface, no damage the loaded objects.
  • High strength/weigth ratio, vavious loading methods.
  • Unique label &color make the slings easy to identity.
  • Non-conducting, no risk of electric shock.
  • High flexiblity and adaptability to make angles.
  • High corrosion resistance and wear abrasion resistance.
  • Anti-oxidation and anti-ultraviolet, not easy to ageing and embrittlement.
  • Working tempereature range is -40°C~100°C.

With such excellent performance and low cost,polyester round slings are widely used in many fields such as industry, agriculture, fishery, construction, ocean, and public railways.

Tie down strap

How to use ratchet tie down and what we should pay attention to when we use it?

Ratchet tie down also called cargo lashing, ratchet strap, ratchet lashing, tie down strap, is used for fixing goods during transportation, movement, shipment or storage. It have the function of locking properties and not fall off. It’s safe, ligth, easy to operate and protect objects from damage. It can be applied to various environments according to different hook type. Each strap stitched with black line show the breaking strength, when we are using it, we can easily knows it’s loading capacity. 

With the widely application of ratchet tie down, most car owers have at least one set of ratchet tie down in their car. Ther are many different materials of tie down straps, but the polyester ratchet tie down is a most popular one. So when we use it, what should we pay attention to? 

There are many types of ratchet straps, but as a basic cargo transport device, the safety is the most important, so we must effectively control the rists and protect them. 

  • Use only the unbroken tie down straps, and the label clearly indicates the ability.
  • Can not be overloaded.
  • Do not tie knot the webbing.
  • When using, try to keep the fabric away from sharp edges and corners from abrasion or cutting.
  • Avoid twisting and twisting the tensioner.
  • Do not place objects on the tie down strap to avoid injury.
  • Do not use the ratchet tie down as a load lifting equipment.

How to use ratchet tie down?

Step 1. To thread ratchet buckle, from bottom thread the webbing though slot  in center rotating spool of closed ratchet.

Step 2. Pull webbing though, leaving some slack.

Step 3, Start ratcheting- raising and lowering handle

Step4 . Stoped it when the strap is tighten, close the ratchet.

How to release ratchet tie down?

Step1: Pull and hold the release tab to release the lock.

Step2. Open ratchet until it is completely open and flat 

Step3. Grab webbing from non-fixed side and pull to release webbing.

recovery strap

Choose a right tow strap/recovery strap

When we drive a car suddenly had some malfunctions or trapped into sand, mud, snow, get stuck and need hauling, what can we do? A tow strap/recovery strap can help, which is light and easy to keep on the vehicle.

Usually a tow strap is made of  high quality polyester yarn and metal hooks on each end , and it is intended for the towing of a freely-moving vehicle behind another vehicle. Specially designed hooks or links can be easily attached to the vehicle, tow strap is lighter than wire ropes and chains, no rust, no rot, no mold, especially suitable for storage in car suitcases or tool cases.

Recovery straps are made of nylon fabrication or plyester yarn. These straps, also called “snatch straps” since they can snatch a vehicle out of a sticky situation, have loops on each end.

Choosing a right strap corresponding with your vehicle weigh is very important. Nanjing Lijing Sling can make custom length since we manufacture them in-house. We can also make the strap from 1- to 4-ply designs, so you can get the width you want with the strength you need. More plies allow for a narrower strap with greater break strength than single ply.

According to different materials and manufacturing methods, the strap maximum tensile force will be different, there are different load-bearing from 1ton to 8 tons, so the choice must be based on your car weight, generally home car  weight is less than 2 tons, so it is enough to choose a tow strap/recovery strap with a maximum tension force of 5 tons.

Choose according to the structure of the vehicle trailer ring. The size of the tow strap hook and fastening ways are also different, so we have to chooose the tow strap according to the type of trailer ring on the car. If stuckedand the tow strap hook was large and the trailer ring on the car was small and could not be rescued. That will be a helpness.

No matter which type of strap you’re using, we must be carefull of using, because straps can snap, or break, and launch through the air at a high rate of speed, the tensile force may break the car or even cause casualties. We must keep away any bystanders at some distances of the strap.

Note: Put a soft thing on the tow strap/recovery strap

Trailers in the city, the vehicle and the tow stap are not very stressed, so the strap will not break. In the case of extreme rescue, put a small flag or a soft item in the center of the tow strap/recovery strap can effectively avoid the broken strap and hooks flying back to hurt around.


Why choose Nanjing Lijing Sling as a supplier?

Why choose Nanjing Lijing Sling as a supplier? 

  • Serious working attitude:

As a manufacturer of making lifting sling and lashing products, every product contains our workers’ hard working.

To make a good product, from purchiansg the raw material to final products selling, not only need our advanced techniques but also each production process is seriously treated by our workers. Nanjing Lijing Sling continously accumulate and summary the working ways and process, avoid the problem which happened before and make sure products are the right ones with customer requriments. For example, the slings labels, each product have it’s unique label with correct load, length and serial number. On the production process, we must carefully check each type product and gurantee the slings with right labels.

  • Good quality and competitive price:

We always choose A-A grade 100% polyester yarn to make best products, and all the products are stictly inspected before delivey. In each production, we randomly choose the products to make testing, if there is any unqualified, we will stop and find the real problem and solve it timely. Before exporting, products are re-testing again to make sure each batch products are qualified. For the price, we are always trying to give a resonabel and stable one to full support. With frequently price changing, custmers are also passive to their clients.

  • Fast delivery:Normally our delivery time is 35dyas for 1*20container , and for urgent order, we can finish in 25days for 1*20container.
  • No small customers: Every customer is important to us and respected. Small order is the same seriously treated as a big order with totally supppot.
  • OEM is welcomed: Our products  have been certified by ISO9001 International Quality Management System, also certificed by TUV, GS, CE. It’s no problem to make your company name or design on the products.
  • Think what customer think, worry what custmer’s worried

Before placing order, our sales person conmunicates with clients about each detail to avoid wrong making; On the making, we follow each order closely; Before shipping, we take photos to clients. After sales, we take each point of the client feedback and suggestion to improve in future production.