Among prestressed anchor materials, there are only two engineering functions of anchors, one is anchoring and the other is tensioning. First of all, let's have a preliminary understanding of some basic knowledge of the tension anchors of the steel strands. The reason why steel strands are called steel strands, as the name suggests, is that all strands of this kind of strands are steel wires. Next, Tianjin Prestressed Anchorage will introduce you to the application of steel strands and the relevant knowledge of the tensioning precautions of steel strand anchors.
1. The application of steel strand
1. Stranded wire is actually a kind of steel product made by twisting many steel wires. Its surface is carbon steel, but the steel stranded wire can be processed on the surface according to different usage needs, adding galvanized layer, zinc-aluminum Alloy layer, aluminum clad layer, copper plating layer, etc.
Therefore, the performance of the steel strand is very good. For example, the corrosion resistance of the steel strand is very good, and it can remain unmelted and deformed at a high temperature, so the strength of the steel strand is very high. The most special point is that steel strands are different from other steel products.
It is completely recyclable, reprocessed and then sold again, so the steel strand is a very environmentally friendly steel product.
2. The steel strand has high strength and good relaxation performance. The advantage in this respect is that it can be used in engineering. Now the scope of use will naturally become more extensive, and the effect of use is also very good. In addition, it is straighter when unfolded,
Therefore, such a kind of steel strand will definitely receive more attention from everyone in the future, and there will be more people who value the production of such a product. This kind of steel strand is also acceptable. Continue to play a big role.
3. Therefore, it is widely used in many different fields such as construction, transportation, energy and chemical industry, environmental protection, urban landscape, medical treatment, catering and so on. It has been well received by people and has more and more customers. Although the steel strand industry has developed relatively late,
However, with the reform and opening up, the national economy continues to develop rapidly, and the demand for steel strands has also been greatly stimulated. And in the long run, steel strands will definitely become a steel product with a broad market.
2. Precautions for tensioning of steel strand anchors
1. The anchor should be kept properly, and there should be no embroideries, water and other dirt in use; there should be no current conduction. Before installing the anchor, please clean up the rust and dirt on the steel strand of the anchor clamping section to avoid the rust and dirt filling the tooth grooves of the clip and cause slippage during tension;
2. Please strictly verify the strength and diameter of the steel strand. When the steel strand is corroded, it cannot be effectively tensioned and anchored. Before installing the anchor plate, please check whether there is any leakage and bonding of the prestressed tendons in the prestressed ducts, if any, it should be eliminated;
3. The working clamp can be installed into the anchor plate to clamp the steel strand after removing the packing paper. However, when the pre-stressed bundle is longer (more than 36 meters) or the single strand exceeds 12 steel strands, it should be coated on the cone hole of the anchor plate. A small amount of lubricant (such as anchoring spirit) to facilitate the follow-up of the clip, anchor withdrawal and anchoring, to prevent wire breakage.
4. When installing the anchor, the anchor plate should be aligned with the stop of the backing plate; the clip should be flush after installation, and tap with a special tool if necessary, but the clip should not be damaged by heavy knocking;
5. In tension construction, the corresponding limit plates and tool anchors must be matched according to the specifications of the working anchors;
6. During the period from the application of prestress to the packaging after anchoring, unless effective shielding measures are taken, the operator shall not move directly in front of the anchor, and cannot hit the steel strand or anchor by gravity; when removing excess steel strand, ensure that the anchor is not Affected by the cutting heat, it is recommended to use a grinding wheel to cut, and it is forbidden to use electric welding and oxygen cutting;
7. Before the sample static load test, the user should wipe clean the clip and anchor plate hole, and the clip should be installed symmetrically and flush, otherwise it will affect the static load test performance.