RU2704061C1 - Method for combined development of flat seams of coal deposits - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used in combined development of flat seams of coal deposits. Method of combined development of flat seams of coal deposits includes open mining, drilling of formation using technology of deep development of coal seams after termination of open mining operations, underground mining. Coal stratum extraction from pillar left in quarry side is performed with application of casing cone pipe, which is left in the worked-out space until moment completion of second entry, passed in parallel and tightly to previous. Then removing pipe from first cut and repeating process. Extraction of the pipe is performed by simultaneous tension along the pipe axis towards the worked-out area with a powerful bulldozer and transmission of vibration pulses to the pipe through the hydraulic breaker tool, made in the form of cushion with segment of circumference with radius equal to external radius of pipe behind attachment point of tension force.

EFFECT: invention allows to reduce losses of minerals left in pillars, provide higher resistance of overburden rocks during drilling of coal bed.

1 cl, 1 dwg

Description

The invention relates to the mining industry and can be used in the combined development of shallow seams of coal deposits.

A known method of the combined development of reservoir deposits, including open cast mining, underground mining and underground mining, RF patent No. 2194858, IPC ⁷ Е21С 41/00, 2002 [1].

The disadvantage of this method is that it is not sufficiently provided for the extraction of reserves entirely between the contour of the quarry and underground mining.

Known installation of auger drilling MB D60-1.2MIL / Ø610 - Ø1828 mm company Michael Byrne, https://novatechservice.ru/equipment/bur/mb-d6072-15 [2]. This type of equipment is used for laying pipes and cases under roads, railways, buildings and in all those cases where the integrity of the surface layer of the soil or coating should not be compromised.

 The disadvantage of this equipment is the difficult extraction of pipes from the rock mass, and as a result, the unprofitability of mining reserves with this design, due to the high cost of metal pipes.

A known method for the combined development of shallow seams of coal deposits, including open pit mining, drilling of a seam using underground technology for deep mining of coal seams, RF patent No. 2312218, IPC ⁷ E21C 41/00, 2007 [3], which is the closest to the claimed method - prototype.

The main disadvantage of this technology is that with the providence of drilling a coal seam, high losses occur in the left safety pillars.

The objective of the invention is the need to develop a method for extracting coal reserves, minimizing the loss of minerals.

The technical result is the reduction of mineral losses during the extraction of coal reserves.

The proposed method for the combined development of shallow seams of coal deposits, including conducting opencast mining, drilling a seam using technology for deep mining of coal seams after the cessation of opencast mining, conducting underground mining, and drilling a coal seam from the pillar left on board the quarry is carried out using a casing cone , which is left in the worked-out space until the completion of the second run, which was parallel and tight with the previous one, but They remove the pipe from the first run-in and the process is repeated, the pipe is removed by simultaneously pulling the pipe axis towards the worked out space with a powerful bulldozer and transmitting vibration pulses behind the mounting force of the tensioning hammer using a hydraulic hammer made in the form of a pillow with a circle segment of radius equal to the outer radius of the pipe.

Distinctive features are:

- drilling a coal seam from the pillar left in the quarry is carried out using a casing cone, this ensures the stability of the development in the process of extraction of minerals, and also reduces the applied force when removing it;

- the casing cone pipe is left in the worked out space until the completion of the second run, which was parallel and tight with the previous one, which minimizes the loss of minerals in the pillars between runs;

- the casing cone is removed from the first run after completion of the second run and the process is repeated, this provides a controlled process of collapse of the worked-out space providing a reduction in mineral losses during the extraction of coal reserves;

- removing the pipe is performed by simultaneously pulling along the pipe axis towards the worked out space with a powerful bulldozer and transmitting vibration pulses behind the attachment of the tension force through the hydraulic hammer tool made in the form of a pillow with a circle segment with a radius equal to the outer radius of the pipe, which reduces the applied force during its extraction and minimizes mineral losses in pillars between calls.

The essence of the method is illustrated in FIG. showing a diagram of drilling a coal seam in a frontal view.

Symbols adopted in Fig .:

1 - coal seam; 2 - empty rocks lying above the reservoir; 3 - loop contour fixed horizontal casing conical pipe; 4 - the contour of the subsequent run-in fixed horizontal casing of the second conical pipe; 5 - loss of minerals at the bottom of a coal seam in pillars between calls; 6 - loss of minerals at the roof of a coal seam in pillars between calls; 7 - the concentration of the lost mineral near the roof of the coal seam after the collapse of the worked-out space during coal extraction.

The method is as follows.

At the coal seam deposit 1 of a shallow bed, after completion of open mining operations, the soil of seam 1 is exposed. Then, work is carried out on the developed space to drill the aforementioned seam [2]. Drilling a coal seam is carried out by a drilling tool, with a screw located in a conical pipe which is a tubular support. Drilling a coal seam occurs to a depth equal to not more than twice the length of the transporting transport carriage in transport or less. The conical pipe for work has a diameter change per meter of its length of 2 mm, which reduces the applied force when it is removed and such a pipe is made to order. In addition, eyelets are provided from the wide end to secure the hooking device during the extraction process. The eyes are located on each other, which avoids the deformation of the pipe. A horizontal drilling rig is installed on a prepared site with a drilling tool enclosed in a conical pipe, and the entire length of the pipe is drilled. In parallel with drilling, the mining of coal is being carried out using a conveyor loader into a dump truck. Next, the drilling tool is removed, the drilling rig is rearranged and the second well is drilled with the drilling tool in a conical pipe close to the previous one. After completion of drilling, the drilling tool is removed to the entire depth of the pipe, the drilling rig is rearranged. After that, the cone pipe of the first well is removed with a bulldozer equipment with a traction class of at least 6 in terms of traction, with a power of at least 103 kW, with its fastening for specially designed eyes in the cone pipe. The process is then repeated.

The proposed method for the combined development of shallow seams of coal deposits allows you to:

- reduce the loss of minerals left in pillars due to the fact that each subsequent well will be adjacent to the conical pipe of the previous entry, and the loss of minerals in a square section with a side equal to the diameter of the drilled well will be 21.5%, which is 28.5% lower than in the prototype.

- To provide higher stability of overburden rocks when conducting work on drilling a coal seam, reducing the effort when removing the casing due to its conical shape, and controlling the collapse of the roof of the formation when removing the cone pipe.

Information sources

1. RF patent No. 2194858 IPC ⁷ E21C41 / 00, publication date 12/20/2002

2. Auger drilling machine MB D60-1.2MIL https://novatechservice.ru/equipment/bur/mb-d6072-15

3. RF patent №2312218 IPC ⁷ E21C41 / 00, publication date 10.12.2007g.

Claims (1)

A method for the combined development of shallow seams of coal deposits, including conducting opencast mining, drilling a formation using technology for deep mining of coal seams after the cessation of opencast mining, conducting underground mining, characterized in that the drilling of a coal seam from the pillar left on board the quarry is carried out with the use of a casing cone, which is left in the worked-out space until the completion of the second run, which was parallel and close to the previous one, the pipe is removed from the first run and the process is repeated, the pipe is removed by simultaneously pulling the pipe axis towards the worked out space with a powerful bulldozer and transmitting vibration pulses to the pipe through a hydraulic hammer tool made in the form of a pillow with a circle segment with a radius equal to the outer radius of the pipe behind the attachment point pulling force.

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