SU825997A1 - Method of mounting reinforced concrete anchors - Google Patents

Description

(54) METHOD OF INSTALLATION OF REINFORCED CONCRETE ANCHORS.

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FIELD OF THE INVENTION The invention relates to mining and can be used to mount the roof of mine workings.

Known methods of installation of reinforced concrete anchors, including, followed by the injection of cement-sand concrete or other hardening material. After the concrete or mortar has hardened, the reinforced concrete anchor is able to absorb the load 1.

However, the injection of concrete into CKBia with pre-installed reinforcing rods requires special devices for its implementation and a considerable investment of time.

There is also known a method for installing reinforced concrete anchors, which includes drilling wells and strengthening them with a fastening mixture of reinforced concrete anchors J2J.

The disadvantage of this method is the uneven distribution of the solution between the walls of the well and the anchor, resulting in incomplete filling of the boundary space, resulting in a decrease in the carrying capacity of the anchor. In addition, preliminary, even partial

filling the well with a solution and a bond with a relatively large anchor diameter does not allow it to be buried in the well beyond the design length, which leads to a decrease in the bearing capacity of the anchor and to a violation of the fastening certificate. In this case, the reduction of the solution with a very small thickness of the layer also leads to a significant decrease in

0 bearing capacity of the anchor.

The purpose of the invention is to increase the carrying capacity of anchors and simplify the installation process.

This goal is achieved by the fact that a reinforced concrete anchor is dipped into the bonding mixture before being inserted into the cord to create a uniform layer of the bonding mixture on its surface. A mortar prepared on the basis of bending cement is used as a bonding mixture.

The method is carried out as follows.

A preformed 5 reinforced concrete anchor with a diameter 5-6 mm less than the diameter of the cord is dipped into a container with a cement-sand stretcher prepared on the basis of self-forced cements. In a circular rotation of the anchor, the cement mortar is uniformly applied to the entire surface of the anchor. At the same time, the rigidity of the solution is experimentally selected so that it is held onto the surface of the anchor due to adhesion. Thereafter, the reinforced concrete anchor is pushed into the well. Self-priming cement is hard, expands and provides sufficient adhesion forces along the contact surface of the concrete rock.

The use of self-pressurized elements in the solution and the uniform distribution of the solution over the surface of the anchor, due to its preliminary dipping into the solution, significantly increases the current support ability. Increasing the load bearing capacity of the lining reduces the installation density of the anchors, resulting in increased safety of mining operations.

Claims (2)

Invention Formula i. The method of installing reinforced anchors, including drilling cords and strengthening them, using a fastening mixture of reinforced concrete anchors, is distinguished and. So that, in order to increase the carrying capacity of the anchors and simplify the process of their installation, the reinforced concrete anchor is dipped into the fastening mixture before being inserted into the cord to create a uniform layer of fastening mixture on its surface. 2. A method according to claim 1, characterized in that a solution prepared on the basis of self-directing cement is used as the binding mixture. Sources of information taken into consideration during the examination 1 V.Mostkov. Subsurface structures of a large section. M., Nedra. 1974, p. 50-54.2, USSR Author's Certificate: No., 357343, class, E 21 D 21/00, 1970.