(1) Wood anchors. There are two kinds of wooden anchors used in China, namely ordinary wood anchors and compressed wood anchors. (2) Steel or steel wire mortar anchors. Cement mortar is used as the binder for the anchor and surrounding rock. (3) inverted wedge metal bolt. This type of bolt was once one of the most widely used forms of bolts. Because of its simple processing, easy installation and certain anchoring force, this kind of anchor is still in use within a certain range. (4) Pipe joint anchors. It is a full length friction anchored anchor. The bolt has the characteristics of simple installation, reliable anchoring, large initial anchoring force and long-term anchoring force increasing with the movement of surrounding rock. (5) Resin anchor. The use of resin as a binder for the anchor is costly. (6) Fast hard expansion cement anchor. It is made of ordinary Portland cement or slag Portland cement with admixture, which has the characteristics of quick setting, early strength, water reduction and expansion. (7) Double fast cement anchors. It is made up of a mixture of finished early strength cement and double fast cement in a certain proportion. It has the characteristics of fast hard and fast coagulation and early strength. Arterial Blood Gas Collection Syringe Arterial Blood Gas Collection Syringe,Arterial Blood Syringe,Syringe,arterial blood gas syringe,disposable syringe Anesthesia Medical Co., Ltd. , https://www.sinoanesthesia.com
Bolt support and its classification
The bolt support essentially installs the anchor rod in the surrounding rock of the roadway, so that the layered and soft rock mass is reinforced in different forms to form a complete supporting structure, providing a certain support resistance and common Impedance displacement and deformation of the surrounding rock.