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Location>> Differences between bolt with plastic expansion cover and common resin bolt |
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Ranges of supporting roller |
For the common resin bolt, anchoring force is formed by adhering the resin anchoring agent on the hole wall. While anchoring force of the bolt with plastic expansion cover is a kind of friction force occurred by the radial force out of the action between initial anchor, plastic cover and obliquity of the cone. Then push the cone move axially through final anchor, to strengthen the acting force of plastic expansion cover and hole walls, so that to get the required anchoring force. It is:
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The bolt with plastic expansion cover abandoned the anchoring adhering method of the traditional resin bolt:
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Ⅰ. Convenient installation. Drilling can be done by electro-drill for only one time. The procedure of second use of electro-drill for resin mixing is no need any more. |
Ⅱ. Anchoring force can be got quicker. Traditional resin bolt has to be wait for some time after resin is mixed until the resin is curing, then to assemble the tray and fasten the nut so that to achieve the anchoring strength. While to the bolt with plastic expansion cover, anchoring force can be realized once the final anchor is finished. It’s a continuous procedure. |
Ⅲ. Accelerate the backstopping speed. The metal bolt of plastic expansion cover can be recovered easily upon backstopping, that resolved the problem of difficulty to dismantle the resin bolt, accelerate the backstopping speed and improve the production efficiency. The indirect economic efficiency is tremendous.
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Ⅳ. The recovered metal bolt can be repeatedly used, that reduces the supporting cost enormously, and realized the purpose of saving energy and lowering consumption. So it has good economic efficiency. |
Ⅴ. Unit price of type 42 ф16×1800 is RMB 34.80 yuan. Every time when reuse it, only need to assemble a set of plastic cone and expansion cover, which costs 12 yuan. It can be repeatedly used for at least 3 times. Cost for 3 times is 36 yuan. Price for four sets of bolts is 70.80 yuan totally, unit price is only 17.70 yuan, that is 17.70 yuan lower than the resin bolt of the same type. If a company group consume 3 million sets of this kind of bolt, 30—45 million yuan of supporting cost could be saved. So its direct economic efficiency is tremendous.
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Ⅵ. To the common resin bolt, if the bolt was not taken off when backstopping, it will damage the excavation machine, and sparks might happen due to impact, that will lead to gas explosion. The recovery and repeatedly use of the plastic expansion type bolt can save supporting cost, also avoid hidden safety danger and the damage to the excavation tools and machines. The plastic end of the plastic expansion type bolt is shaped by means of mould injection with high pressure. It has certain pressure resistance, and tensile strength. Practice prove its integrated anchoring strength is above 8KN and very stable. It can be widely used on the side bolt for backstopping in underground extraction. |
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