RU2524928C1 - Shaft lining with cast-in-situ concrete - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: mortar is mechanically activated at disintegrator. Motor is prepared at sinking platform. Crushed stone and motor are laid in layers in jud over lining.

EFFECT: lining of shafts at high final hardness of concrete.

Description

The invention relates to the mining industry, in particular to methods of fastening vertical trunks, and can be used in the trunks of coal mines and mines, as well as in vertical mine workings of underground urban infrastructure.

There is a method of erecting a monolithic concrete lining in vertical trunks, aimed at improving the quality of lining and reducing the cost of work [1]. The disadvantage of the proposed solution is the need to create longitudinal channels in the rock walls of the trunk for placement of concrete pipelines in them. This increases the amount of manual labor and the duration of construction; in the event of clogging of the concrete pipeline, it is not possible to clean or replace it.

Also known is a method of erecting concrete lining, aimed at increasing strength and reducing water permeability of concrete due to seamless erection under the influence of external pressure [2]. The disadvantage of the proposed solution is the presence of a residual clay admixture, which reduces the strength characteristics of concrete, as well as the technical complexity of implementation in practice.

Closest to the proposed is the "Method of concreting the fixed space of the trunks" [3]. The disadvantages of the analogue are the low quality of concreting due to the mixing of cement-sand mortar with clay; high porosity due to the weighing effect of the clay solution and the impossibility of compaction.

The aim of the invention is the creation of a method of fastening trunks, which allows to increase the final strength of concrete and increase the speed of curing.

To achieve this goal, a method for securing trunks is proposed, which includes mechanical activation of cement mortar, separate descent of crushed stone, sand, cement mortar, preparation of cement-sand mortar on a tunnel shelf, layer-by-layer laying of crushed stone and cement mortar.

According to the proposed method, the barrel is mounted as the flushing fluid is pumped out from top to bottom. After the rock walls are exposed to a height of at least 4 m, the pallet is rearranged for a new entry, picketed and unfastened, the formwork is lowered and unfastened, pipelines are expanded and layered laying of crushed stone is started, followed by pouring with cement-sand mortar. Crushed stone and sand are delivered to the face using pipelines, cement mortar containers. After the concreting process is over, they wait the time for the concrete to gain formwork strength and move the formwork to a new run. After that, all processes are repeated.

The concrete preparation process includes five stages:

1. Cement is shut with the design amount of water.

2. The resulting solution is subjected to mechanical activation by passing 1 or more times through a unit such as a disintegrator.

3. The activated solution is lowered in containers onto the tunnel shelf.

4. In the drum of the mechanical mixer, sand is added to the solution.

5. The final stage of concrete preparation occurs behind the formwork, where crushed stone is laid in layers and poured with cement-sand mortar.

Mechanical activation changes the type and number of defects in the structure of cement, while energy is accumulated in it, the value of which can reach a significant part of the energy spent on processing. By varying the intensity of the impact (rotor speed, number of processing cycles), it is possible to control the quantity and quality of electrical activity of point defects arising in the surface layers.

For the optimal flow of the mechanical activation process, the system must undergo sudden abrupt changes in the load. Many times greater pulsed powers and frequencies are achieved in a disintegrator than when a material is processed in a ball or vibration mill, and material particles receive a greater amount of energy. Processing the solution in a disintegrator with overloads of up to four hundred million accelerations of gravity leads to the fact that a special type of energy is accumulated in the cement particles and the structure changes, which positively affects its properties.

The performed experiments showed that the mechanical activation of the cement slurry leads to an increase in the final strength of concrete to 1.2-1.35 times and increases the speed of curing to 1.5 times.

Literature

1. A.S. 1081352 SU, IPC E21D 5/04. A method of erecting a monolithic concrete lining of a mine shaft and a device for its implementation / Turkyan R.A., Novik E.B., Margulis E.M., Makarov A.A .; applicant and patent holder Design and technological trust of the organization and technology of mine construction "Orgtekhshakhtostroy". 3,537,885 / 22-03; claimed January 11, 1983; publ. 03/23/1984. Bull. No. 11.

2. A.S. No. 136285 SU, IPC E21D 5/04. The method of construction of a seamless concrete lining of the mine shaft / Marenny Y.I., Grinev A.A. 658765/22; claimed March 15, 1960; publ. 1961 Bull. No. 5.

3. A.S. 362921 SU, IPC E21D 5/04. The method of concreting the tightness of the trunk space / Bagza MI 1,425,891 / 22-3; claimed 04/03/1970; publ. 12/20/1972, Bull. Number 3.

Claims (1)

The method of fixing the barrel with cast concrete, including the separate supply of components through separate pipelines with the formation of concrete mixture directly at the place of its laying, characterized in that the cement mortar is subjected to mechanical activation in apparatus such as a disintegrator, cement-sand mortar is prepared on a tunnel shelf, crushed stone and cement sand mortar is laid in layers within one run on the mount.