DE2305385B2 - FRONT DRILL HOLE AND DRILL PIPING FOR IT - Google Patents

Description

_The ending relates to boreholes for pre-watering in coal mining operations from the mining route. the hn seam hanging walls or lying slopes run and with several deflections in the area of the later face center.

In the case of pre-watering, several boreholes are generally drilled into the seam from a stretch above the seam to be soaked (»Glückauf«. 1968, p. 1145. Fig. 2) or in the direction of strike from stretches in the adjacent gesture Lowered or introduced _{^^^ Fig ubetneb} e _m one

_hey, in which the tailgate of the upper ends is _vorha been weiterentwickek. ^^ _{before rfer} aspiring front are ^ ^ eser from the working range of Tränkbohrg ™ ¹ ™ _{form a} "balüstischen curve" on the öcnei _hange hands or lying adjacent rock

"""""Vu _later longwall center in the seam ¹ ^ _n JRL _{0n this} e boreholes are _repeated in country rock eingeDrac ^^ deflecting within

^ ~ ^G g _b hinge leads _{to the F} i _öz this process, two ^ _"d rei straight borehole sections« ^ to one or two "deflected _by approximately 6 ° for the ^ Dκηκ" corresponding whipstocks verwen-

™ J "J? _{& Ese} modification of pre-watering is aeu £ ^u limited number of degradation _{beds in addition} to η only η ι a ^ _{multiple, is} followed up with

™ ^tzca V _shortly superior degradation routes operated or only S

_the task is to

1 * dismantling track for all dismantling

_{To make 5} ^f ^^^ A _ch and for this purpose suitable equipment to 8 a borehole casing for such ears and ears as well

^Bo ^ "5 _d " _{triggers the} task at a borehole rfäkn in mining operations of the Steinon of the mining route. which extends in the ^ S ^ Sea and enters multi Ablenkunim region of the later longwall center in the Stakende to seam, characterized in that the borehole in Srt he _d degradation route is attached. initially via a two-week to monthly dismantling progression

run, * ^"n" J ^^. _Abl enkung in the seam which schl.eßhch a ^ w «te ^ e" ^ _{fortschrejtenden}

Danger of degradation

Hang ^ J ^e ^
Vorferntrwwen

^D ^

g as

«^ _Progressive

_{Teüs of the} well in the _{decomposition zone,} the _de ° _{n may be the entire} time that the β Watering station in

L to be continued. Against Bohri *. that is only suitable for far. So you can get by with horrors. A risk ^ of _{the safe} detour via the

^ Do not give a push at any time. Tears e ^ _Au

m borehole for pre-soaking in

of the

Seam-lying runs and _i ^ vertical plane

can be and that overall less Bphrutat far

are only affected to a comparatively minor extent in the course of the dismantling process.

It is recommended to drill the holes for pre-soaking, so that they are caused by mining impairments that also occur above the mining route and in the seam, not be so badly harmed with piping that can be removed by it indicates that a string of flexible pipes by means of pressure cementation of the annulus over the The entire length of the borehole standing in the rock is fixed in the borehole. It is already over "Glückauf", 1971, p. 913, known to introduce a soaking hose into the initial part of a drinking hole and to fix it by filling the annular space with cement mortar to create a seal at the same time to effect. The cemented pipe string has an anchor-like reinforcing effect, so that the adjacent rock in the the entire borehole area cannot break open and shift so easily. In addition, the Cementing existing weak points in the form of cracks, creating a further reinforcement and filling Protective effect is achieved in the entire borehole area.

The invention is described in more detail below with reference to the drawing in an example. Show it

F i g. 1 and 2 in plan and in side plan a borehole that runs in the hanging wall,

F i g. 3 and 4, also in plan and in side elevation, a borehole that runs horizontally

In the figures, 1 shows the mining apron vrr a longwall 3 in a seam 9. Behind the longwall 3, which is advancing in the mining direction (arrow 4), the old man 2, the already cooled and filled part of the seam, is shown together with the Longwall 3, the mining stretches 5 and 6 are driven on, the locations 50 and 60 of which, in the example, are set a short distance in front of the longwall 3 Above the seam 9, the hanging secondary rock H and below the lying secondary rock L is shown.

For the purpose of binding the dust, the coal of the seam 9 is soaked with water in the mining apron, which happens biim Voricrntfänkvefiahren from a point 10, which is arranged approximately in the center of the face of the later face. This drinking water outlet point 10 is located in the example at a distance from / in front of the face 3, with / corresponding to a progress of mining of half a month to a full month. The drinking water runs through the entire seam in the area of the mining apron 1, starting from the drinking point 10 In this way an intensive impregnation of the seam is achieved

To the impregnation water outlet point 10 leads in the example of Fig.l, a borehole 7, which is in the hanging of the seam is arranged, takes its exit in the area of the superior location 50, initially above the later following route 5 runs at a distance / is deflected, now at an angle to route 5 in The hanging wall of the seam runs in the mining apron 1 and sinks into the seam in front of the later center of the face and ends approximately in the middle of the seam. The selected course of the borehole 7 above the route ensures that the Drinking water outlet point 10 during the entire time that the longwall 3 needs to get there, can be supplied with water without the degradation effects, in particular the collapse of the hanging wall layers behind the longwall 3 in the area of the old man 2, destroy the borehole. That too Smaller movements caused by the degradation above the section 5 are thereby prevented that the borehole 7 from the borehole attachment point 11 to the entry into the seam with a flexible Pipe is lined and the annular space between the pipe string and the borehole wall through Injection of cement slurry or mortar is filled. The cemented pipe string acts like an anchor and strengthens the rock in the borehole area so that it is not easily broken by the effects of mining

The impregnation water outlet point 10 can also, as shown in FIG. 3 and 4 show a borehole 8, which in Lying of the seam 9 is arranged and the attachment point 12 is in the area of the location 50 is reached will. In this case, the borehole 8 is inclined to the section 5 directly in the direction of the impregnation point 10 because the degradation effects in the area of the horizontal are weaker than those in the hanging wall of the Seams 9. Shortly before the impregnation water outlet point 10, the borehole is deflected towards the seam 9 and ends in the Middle of the seam. As with the previously described borehole 7, a casing is also used in the case of the borehole 8 and pressure cementation performed.

1 sheet of drawings

Claims (3)

. 1969 p. 1245 to 1. Borehole for pre-watering in mining operations coal mining from the mining stretch which runs in the seam hanging wall and m.t. emtntt several distractions in the area of the later face center in the seam to be soaked characterized in that the drill hole (7) in the location (50 or 60) of the mining section (5 or 6) is set. first of all over a length (1) corresponding to a two-week to monthly mining progress in the mining route direction (4), then a deflection to the mining field hm and finally a further deflection m the seam (9) has. _AU . . 2. Borehole for pre-soaking in mining operations coal mining from the mining route. that runs in the seam lying and with several deflections in a vertical plane in the area of the later face center in the to soaking seam occurs, characterized in that the borehole (8) in the place (50 or 60) of the Mining route (5 or 6) is set and inclined to Mining route direction running after approximately a two-week to monthly mining progress corresponding length (1) in the seam (9) increases 3. Borehole casing for Vorferntränkbohrlöcher according to claims 1 and 2. thereby characterized in that a pipe string of flexible pipes by means of pressure cementation of the R.ngraumes is fixed over the entire length of the borehole standing in the rock in the borehole (7, 8). ^l5