SU1557330A1 - Shield for mining thick steep beds - Google Patents

Abstract

The invention relates to the mining industry and is intended to develop thick steep seams with a shield system. The goal is to increase the carrying capacity of the shield by creating prestressing. The shield includes truss beams (B) 1, interconnected along the strike of the formation by longitudinal metal along (MP) 2 and clamp bolts 3. At the same time, B is prestressed. Each B 1 is made of wooden B 4 (nakatina) with metal tips 5 installed on the ends. The MP 6 is attached to the tips 5. The latter is a prestressed tie rod and is made of flat steel, steel ropes, etc. and tensioned with a force corresponding to deflection B 1. Between the wooden B 4 and MP 6 rigid spacing posts 7 are installed. The metal heads 5 are made in the form of open-top boxes, which are connected to the lower part with pre-tension straps. For fixing the tip 5 on B 4, there are eyelets under the finger 9 in the upper parts of the side walls. Metal inserts 10 are installed between the wall of the tip 5 and the end B 4. The cleaning work under the shield is carried out by drilling and blasting. 3 il.

Description

Phie.1

The invention relates to the mining industry and is intended to develop thick steep seams with a shield system of

The aim of the invention is to increase the carrying capacity of the shield by creating a preliminary voltage "

Fig. 1 shows the construction of a wooden truss beam, side view; Fig 2 - section A-A in Fig „1; FIG. 3 shows a section BB in FIG. 1 a.

The shield for the development of thick steep seams consists of mnpeHrejfbHbix bars 1, interconnected along the metal strike

longitudinal on the 2 themselves and clamps (tension bolts) 3 “Each transom beam is made of a wooden beam (nakatina) 4 with metal tips 5 installed on the ends; Metallic 6, made of flat steel, steel ropes or bundles of high-strength cold-drawn steel wire, is fixed to the tips 5. A rigid strut 7 is installed between the wooden beam 4 and the metal pole 6. The metal tips 5 are made in the form of ducts with two open walls : From the top side and to install the head on the wooden beam 4U To fix the head on the wooden beam in the upper parts of the side walls there are eyelets 8 for finger 9 "Between the wall head 5 and the end of the tree beams 4 are fitted with metal inserts 10 o The pre-beam beams are prestressed: the wooden beam 4 has a deflection (50 - 70 mm) in the opposite direction from the metal belt 6, which in turn is pulled with a force corresponding to this deflection

Cleaning work under the shield of the spars of the gel beams is carried out by drilling and blasting, as under non-sectional elastic shields of

Claims (1)

Invention Formula Shield for the development of powerful steep seams, including a wooden knurled-out nack of girder beams, which are interconnected by metal longitudinal ones themselves, prestressed straps, spacers located under the nakatnik in its middle part between the beams and straps, differing In order to increase the bearing capacity of the shield by creating prestressing of the beams, the shield is equipped with tip-shaped beams installed at the ends, made in the form of open-top boxes, which are connected to the bottom with with each of the beams by means of removable fixing elements located on the upper side of the box, and metal liners installed between the ends of the tip and the knurling, and the spacer elements are made in the form of rigid posts, and the prestressed straps are in the form of rigid metal on owls. Aa 6-5 eight Fig.Z