Novel expansion-type yielding prestress grouting anchor rope and using method thereof

Abstract

The invention discloses a novel expansion-type yielding prestress grouting anchor rope and a using method thereof. An anchor rope body also comprises a hollow rod body which is connected to the bottom end of the anchor rope body and is provided with a conical head; a grouting core pipe extends into the hollow rod body; a grouting hole is machined on the conical head; an expansion pipe with the diameter smaller than that of the conical head is sleeved on the anchor rope body; the bottom end of the expansion pipe is provided with an open groove; the length of the expansion pipe meets the fact that one end of the expansion pipe butts against the conical head, and the other end of the expansion pipe butts against a locking device; a tray consists of two plate bodies which are overlapped and buckled mutually, wherein one plate body is a disc-shaped plate body playing a yielding effect, and the other plate body is a trumpet-head-shaped plate body for being plugged on a hole opening. The novel expansion-type yielding prestress grouting anchor rope provided by the invention not only has initial anchor force and a yielding effect, and good supporting and protecting effects when surrounding rocks are deformed, but also has the effect of reinforcing developed cracks and loosen surrounding rocks through grouting, but also can buffer to remove a part of pressure when the pressure is high.

Description

technical field [0001] The invention relates to a grouting anchor cable used in mine roadways, road tunnels and water conservancy culvert support projects. Background technique [0002] At present, a large number of anchor cables are used in mine roadway support, road tunnel support, water conservancy culvert support, mountain reinforcement, building pile foundation reinforcement and other projects to reinforce the surrounding rock, thereby improving the surrounding rock. The strength of its own pressure is an active form of support. [0003] However, in the case of cracks and loose rocks in the surrounding rock, the single anchoring effect of the anchor cable cannot effectively combine the surrounding rock into one body and increase the bearing pressure of the surrounding rock itself. Therefore, there are various grouting anchor cables on the market. The grouting anchor cable is composed of an anchor cable body, a tray and a locking device. The anchor cable body is a hollo...

AI Technical Summary

Problems solved by technology

However, this kind of grouting anchor cable has no initial anchoring force, and the anchoring effect can only be produced after the grout has solidified to a certain strength; moreover, the tray is flat, and cannot play a role in yielding when the surrounding rock deforms, although there are currently yielding trays, For example, butterfly-shaped and hemispherical trays, but this pressure tray cannot play the role of grouting plug, and the grout is easy to overflow from the orifice during grouting, resulting in insufficient grouting pressure and failing to achieve the grouting effect

Images