Fully bonded cement mortar bolt and grouting method

Abstract

A fully bonded cement mortar bolt provided by the invention comprises a bolt body, and an exhaust pipe is arranged on the bolt body. A grouting method using the above-mentioned fully bonded cement mortar anchor, comprising the following steps: insert the anchor body into the anchor hole, set a grouting pipe at the nozzle, and fix it at the anchor hole orifice with anchoring agent or cement mortar After the bolt hole has a certain strength, grout the bolt hole from the grouting pipe, and the air in the grouting process is discharged from the exhaust pipe; through the above steps, the fully bonded cement mortar can be realized Anchor grouting. The invention can carry out grouting construction after inserting the anchor rod body into the anchor rod hole, and eliminates the problem that the first grouting method is limited by the setting time of cement mortar. By adopting the present invention, after large-scale completion of the inserted rods, grouting can be done in one batch or in batches, the process can be simplified, the installation speed of the bolts can be greatly improved, the labor intensity can be reduced, the work efficiency can be improved, and the construction cost can be saved.

Description

technical field [0001] The invention relates to the field of rock reinforcement in construction engineering and grouting construction in underground caverns, in particular to a fully bonded cement mortar bolt and a grouting method. Background technique [0002] At present, the method of first grouting and then inserting the bolt is widely used in the installation of fully bonded cement mortar bolts. This method is to insert the grouting pipe into the bottom of the anchor hole in the drilled anchor hole, and use the grouting machine to inject cement mortar into the bottom of the hole. The grouting pipe slowly pulls out the anchor as the mortar is injected. Holes, pull out all the grouting pipes, quickly insert the anchor rod body, and then block the holes with wooden wedges to prevent the loss of mortar. [0003] Using the method of grouting first and then inserting the anchor rod, on the one hand, due to the limitation of the setting time of the cement mortar poured first, ...

AI Technical Summary

Problems solved by technology

[0003] Using the method of grouting first and then inserting the anchor rod, on the one hand, due to the limitation of the setting time of the cement mortar poured first, the cement mortar mixed each time cannot be too much, and it can be used as it is mixed. The quantity should not be too much. Generally, the quantity of mortar mixed at one time should not exceed 3 holes, so as to avoid the time being too long, making the mortar condense in the grouting equipment or holes, resulting in slow bolt installation, high labor intensity and low work efficiency; On the other hand, due to the fluidity of cement mortar, first pour cement mortar into the drilled anchor holes, especially the anchor holes at elevation angles and the upward construction anchor holes of the top arch of underground caverns. Therefore, when pouring mortar and inserting the anchor, the mortar is seriously wasted, and the quality of the anchor cannot be guaranteed; in addition, the method of inserting the anchor after grouting is subject to prior restrictions when inserting the anchor, especially during manual construction. The resistance of the poured mortar requires a lot of physical strength, high labor intensity, high cost and certain safety hazards

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