Construction of pipe joint anchor rod in mine shaft support engineering(1)

Construction of Pipe Joint Anchor rod in mine shaft support engineering

Abstract: Anchor Bolt support is gradually widely used in modern mines because of its low cost, good supporting effect and low labor intensity, and it has been widely promoted and applied in the coal industry. The technical principles and corresponding theories of bolt support are described. There are many types and methods of bolt support used in mines, and there are still some key points and difficulties in modern mine bolt support, especially in coal mines. Then this article discusses the bolt support, the purpose is to make the bolt support Support can be more widely used. The application of Pipe Joint Bolt support technology in the construction of coal mine roadways has improved the safety of coal mine roadway work.

Keywords: pipe joint bolts;Mine Rock Bolt;Split Set Bolt;Friction Rock Bolt;mine shafts; support construction;

Coal mine roadway support has always been the focus of national safety management. With the development in recent years, bolt support has been more and more widely used in coal mines, and bolt support is a barrier to ensure safe production in coal mines. For coal mines, bolt support not only guarantees safety, but is also economically feasible. Therefore, for the application of bolt support in modern mines, the existing problems and the problems that need to be paid attention to, we will focus on the discussion here, hoping that bolt support can be better developed.

1. Project Overview

Some mines mainly mine 38# and 39# coal seams in Tongziyan Formation. 39# Dongyun Lane at the level of 570 meters in the mining area of the working face. This transport lane is used for gangue (coal), pedestrian, material handling, ventilation and other purposes; the lane is located at the bottom of the 39# coal seam, and the lithology of the roadway is mainly designed As follows: fine siltstone, sandy mudstone, lithological hardness coefficient of four to six, mainly monoclinic structure. Because the surrounding rock is relatively developed during the construction process, it is easy to fall off, and the roadway is exposed and the geological structure is analyzed, and there is a slotted pipe bolt support.

2. Commonly used anchor rod types and processes

2.1 Anchor rod type

At present, people are most familiar with four types of bolts: (1) wooden anchor rod; (2) metal anchor rod; (3) resin anchor rod; ⑷ cement anchor rod. The metal anchor is mainly composed of a plate, an exposed mother, a fixed wedge and a wedge. Cement anchors mainly include reinforced mortar, mortar anchor cables and anchors, including fast-hardening cement anchors and fast-hardening cement expansion cement anchors. Common anchors include full anchors, end anchors and expansion caps. Various mule bolts have different properties and are in use. In actual applications, mine workers should be familiar with and understand the use of various mules to ensure a good support effect during the mine support construction process and the safety of construction personnel.

2.2 Bolt support technology

The construction sequence of bolt support technology has the following steps: (1) Bolt connection work before the start of the work positioning; (2) Determine the location that needs anchor protection, and use drilling equipment for drilling work; (3) Cleaning Drill holes and clean the rubble; (4) apply medicine to the bolt; (5) install the bolt and stir the medicine evenly; (6) fix the anchor to a standstill and wait for use; (7) use for hanging the net on the surrounding rock; (8) Relevant accessories and equipment installation; (9) Check whether the anchor rod is working firmly.