SU898083A1 - Method of constructing mine roof support - Google Patents

Description

(54) METHOD FOR CONSTRUCTING STRAPS OF MINING PRODUCTS

one

The invention relates to methods for the erection of lining of mine workings and may find application in the coal and mining industries.

There is a method of erection of lining of mine workings, including the erection of a facing-bearing shell by means of the formwork, lining of wells, installation of injectors and plugging of rocks through them 1.

However, the multistage work, using different equipment at each stage, makes this method not economical.

The closest to the invention of the technical essence and the achieved result is the method of erection of lining of mine workings, including installation of mobile formwork during carrying out development, erection of internal facing-bearing shell by pumping hardening materials through the formwork and creating outer shell of reinforced rocks 2.

However, with this method, which involves the simultaneous execution of work, the carrying capacity of the support is not sufficiently high, due to the impossibility of creating a high-quality external shell with a limited injection pressure (1-10 -2-10 Pa), perceived only by the formwork.

The purpose of the invention is to increase the carrier

 lining ability.

The goal is achieved by the fact that the cladding shell of the lining is erected in the mine working place before the start of work on the creation of the outer shell of reinforced mountain

Q rocks, and the latter create through the formwork and facing-bearing shell.

FIG. 1 shows the hearth development, longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

15 The construction of the lining is carried out as follows.

As advancement is made, sections of metal lining formwork 1 are installed in it, which serves as temporary lining and formwork to create the inner facing and bearing shell of lining 2. To prevent cement grout from flowing into the production, the end wall 3 is erected using known methods. AT

complex mining and geological conditions, the erection of the end wall is carried out after the installation of the sections of the roll-formwork for the length of the inlet, in other rocks - after penetration of the development by 3-5 steps. Then, under complex mining and geological conditions, they proceed to the construction of the inner facing-bearing casing 2. Under other conditions, the excavation of the mine continues. The erection of the inner facing-bearing shell 2 is started when the slaughter is removed for a distance equal to a certain number of formwork sections. At the same time, the high-quality creation of the outer casing 4 is provided by the possibility of applying high injection pressures (up to Pa) under the protection of the inner casing 2 and formwork 1. To erect the inner lining-carrying casing 2, they are connected to the pressure pipes 5 fixed to the support 1 1 and pump hardening material, for example, cement-sand mortar, concrete, cement-ash mortar, etc. If necessary, hardening material is added to the hardening material. After the inner facing-carrier shell 2 has hardened, after 0.5-1 days, the well 7 is drilled to the required depth through nozzles 5. When the rocks are hardened with cement mortars, they are drilled to improve the quality of the outer carrier shell 4 by draining the filtering liquid phase of the solutions. before the start of injection, all the wells intended for cementation are used and some of them are used as drains. A pressure hose 6 of the pumping unit 8 is attached to the nozzles 5 and the rock mass is strengthened with solutions, the composition and concentration of which are selected in accordance with the opening of the cracks and their absorption capacity. Having finished the injection of the reinforcement solution into the mountain massif, the discharge hose b is disconnected, and after 1-2 days the support-formwork 1 sections are removed and rearranged.

For the construction of the inner facing carrier 2 and the creation of the outer carrier shell 4, the same set of equipment (pumps, mortar mixers, tanks with ready-made mortar, trolleys with initial components for the preparation of solutions) is used, which is removed from the slab for a considerable distance and therefore interferes with tunneling works.

Claims (2)

1.Kleiner T. Tamponage rocks during mining works. - “Glucauf, 1970, No. 13, p. 44-45. 2. USSR author's certificate No. 625044, cl. E 21 D 11/00, 1977 (prototype).