FR2480850A1 - CLOSURE, PARTICULARLY FOR WELDING HOLES TO BE FILLED UNDER PRESSURE, IN ORDER TO CONSOLIDATE THE ROCKS DURING COAL EXPLOITATION - Google Patents

Abstract

THE CLOSURE IS ESPECIALLY INTENDED FOR SURVEY HOLES TO BE FILLED UNDER PRESSURE, WITH A VIEW OF CONSOLIDATION OF ROCKS DURING A BOTTOM COAL EXPLOITATION. A HOLLOW AND ELASTIC CLOSURE PART 16 IS EQUIPPED WITH A VALVE HEAD 12, 14 AT EACH OF THE TWO OPPOSING ENDS AND EACH VALVE HEAD 12, 14 INCLUDES A CHECK VALVE 60, 62, 68 , 70. THE FLOW DIRECTIONS OF THE TWO CHECK VALVES ARE STRAIGHTENED AND THE VALVE 68, 70 LOCATED DOWNSTREAM IN THE DIRECTION OF THE FLOW IS SUBJECT TO A PRE-STRAINING LIMITING THE INTERNAL PRESSURE OF THE CLOSING PART 16.

Description

The present invention relates to a closure intended in particular for

  boreholes to be filled under pressure, in

view of consolidating the rocks during the exploitation of

good at bottom.

  To obtain consolidation of the rocks during coal mining at the bottom, holes are drilled in the rocks according to a known procedure and these holes are then filled with foam under pressure. Metal plugs are used for this purpose, which are introduced into the borehole as a connection piece for a filling pipe or filling system and which, after the forced foam has hardened in the borehole , are

  extracted from it as much as possible.

The known metal closures in the form of dowels are made in the manner of dowels to be separated. The dowel is first introduced in the unexpanded state into the borehole, then is pushed apart by pressure during a second operation, for example, by screwing a device to be spread, in order to close the soundproofing. These closings of

  borehole are manufactured in a relatively coO-

  teuse and handling also requires a relatively long work. Therefore, the object of the present invention is to provide a borehole closure which is manageable and which can be manufactured at a favorable price while providing at least

the same efficiency.

  This object is achieved, in accordance with the present invention,

  in the sense that a hollow, elastic closure piece is moved

denies a valve head at each of the two ends opposite to each other, that each valve head includes a valve

check, that the flow directions of the two check valves

  are straightened and the valve located downstream in the direction

  of the flow is subjected to a prestress limiting the pressure

  inside of the closing part.

A borehole closure of this type is relative-

  simple and inexpensive to manufacture, no special operation

the is no longer necessary, after the introduction of the closure in the borehole, to remove this closure in said -2 - borehole. Exclusively, the filling pipe or the filling system is connected and the foam under pressure

  is introduced. Therefore, the closing piece hollow and elastic-

  tick moves away first to seal the sound hole

  dage, then the valve located downstream opens when a predetermined pressure is exceeded and the foam can flow into the

  borehole sealed now.

  In known borehole closures, it is not

  not desired, only for cost reasons, to extract

  1O as far as possible the closure inserted in the borehole after the hardening of the forced foam - in this same hole

  survey. As these known borehole closures are understood

  pose of metal, the risk exists in particular to see the head of

  operating tool probe deteriorate or even fall out

truire, during subsequent coal mining, by the impact of the mining tool on the closure remaining in the borehole. Although it is therefore desirable to extract

  the closing of the borehole, which is linked to another tra-

  vail, this operation does not always succeed, so that the mid-

  get in danger of operating tools is present.

The closure of a borehole according to the invention allows

  also solves this problem advantageously and so app-

  also bring another improvement with regard to the re-

duction sought- work.

  An advantageous solution of the invention consists in particular in that at least one basic body of the envelope type of the heads

  valve consists of a synthetic material.

  Consequently, the closing of the borehole can remain in it without endangering the operating tools because no endangering of the probe heads is present thanks to the synthetic material. Similarly, the work required to extract the closures from the borehole is in

consequence avoided.

  Other advantageous features of the invention are

data below.

The invention is explained in detail in the following text,

  using the following description of an exemplary embodiment

  shown in the accompanying drawings, in which: Figure 1 is a side view in partial section of a borehole closure according to the invention before its introduction into said borehole and Figure 2 eat a rprrenteton o corespondentà that of fig3ure 2 of the borehole eretur after its in

  trductóon and after ecaFrtesent of the elastic closing part

than.

  The borehole hole design marked with 20 in oen-

  seoble cooperates a piece of 'erieture 15 inserted between two' Zeo valve 22 and 24 e; designed co.a: e a rubber hose r O {i O t t! n - an h. ute, O n a and whose d ia tea ie is u n little

  more pe-t b l tat nr. 7 loaded0 than that of a probing hole -

  if e er3!; r-b; cie ce og last out s @! evae pao re faxemp e 10 to 3 & 5 Le1, deue tctes de soupspa 2 et, 4 Composenten eubsetan'c ce dS corp s rró be ZS s0e syr o 2triqean circulars by 5ap'p! i, ! uJ '; * pipe t prrou u by a c nduit cenlt rat 22 and 'bo, m .. r2ent6 ets the piece of' er, J ure 26 les co rps de bsss 28, i _3 0 copreb '19i cOacuOru une f; tfion tu ulusire 26 and 28 2 (Fue3 d0uQ ilet 2nt & éru 0r 30 t 32 d.-ons! equelt etV Visse!; t3 trói; id fl pourrue D un '2lt et erieur corresponde n "et 36) a- epi aoe d. c rteqe ? tul! air: 35 which would be to get the gods tIe 7od coupape 3, 24 &, u] e diancu pr Dd: a terin @ e on 3lqule, s jsend laae Pc de fa rastura 216 so that it can be introduced!, f3e aiesen S, into the sounding hole by means of a hose or a charging tube On the external surfaces 4 and 4 ;! djaes sections tubulsir: e? 26 and 28 we fixed sectionE finlea 4 and 46 of the; closing piece i6 in the shape of a pipe which are covered by the clamping sleeves 48 and 50

0 formed on the base bodies% S and 20.

  The two valve heads 22 and 14 are designed differently.

ment as regards the arrangement of the valves, depending on the intended direction of flow When the closure 10 is put

  in place in the borehole to be closed, the foam to be introduced

  <5 re in the borehole must penetrate by pressure in it

  ci through the closure 10o For this purpose, a filling tube 52 is connected to the valve face 12 adjacent to the borehole orifice. The base body 18 is provided

  for this purpose, at its final end remote from the closing head

  ture 16, an inner thread 54, at the inner end of which is formed a shoulder 56 which surrounds a valve opening 59. A seal 58 is disposed on the shoulder 56. Downstream of the direction of flow, i.e. in the direction of

  another valve head! 4, we formed, on the other side of the

  valve seat 58, a conical seat 60 to which is attached

  a ball 62 pressed by a pressure spring 64 against the seat

  F0S valve spring The pressure spring 64 rests on the end

  mity of the spacer 38 ise in place in the body of

base 18.

  A reopening of G6 valves is also planned in the head of siCupape e, located in ava; similarly, on the side e. downstream of this ce., v? ' valve valve 66, i.e. on the side

  glosocn, from spacer 38, a seat 68 has been formed

  ule is attached a ball 70 pressed by a pressure spring

72 In.tre-.î t'cuFaps The pressure spring 72 is

  pu is u.n a v 74 r..cordd by screwing in the internal thread

rieur.7, -,> r 6-n2 - ci on fi1ale of the basic body 20, eloi-

  cnea of l, d- r; e: ue ^. By moving the screw connection 74, we adjust the Action of the resr- 72 whose force is each time greater _us calle of the nut 64 of the valve head 12, as well as at cost ^ De la prhase ... ale of the introduction of the foam under preSsJn, the part, closing 16 is firstly discarded avaint that the foam pui.se out of the borehole. The screw connection 74 is provided with an opening 78 for the passage of the foam in the borehole.

So that the material penetrates through the tr-

  te of valve 12 and its opening 58 in the closing 10 of borehole, then from this first in the spacer 38, can move aside the closing part 16, this spacer 38 is provided with several perforations 80. The closure 10 of the pre-described borehole is distinguished by a relatively simple construction which can be produced at a favorable cost. The handling is a priori simple because the closing of the borehole must be introduced beforehand into the latter exclusively by the precise side, that is to say - 4 -

  the one with the valve head 14, then the conduit for the

born from the pressurized head must be connected and disposed of

  te after filling the borehole.

With the exception of springs 64 and 72 and balls 62 and 70, the borehole closure 10 consists exclusively of a

  material which does not offer any appreciable resistance to the ex-

exploitation, so that endangering the operating tools

  tion by this borehole closure is no longer present.

Claims (8)

Claims   1. Closure intended in particular for probing holes   ge to be filled under pressure, in order to consolidate the rocks during coal mining at the bottom, characterized in that a hollow and elastic closing part (16) is provided with a   valve head (12, 14) at each of the two opposite ends   to each other; in that each valve head (12, 14) includes a check valve (60, 62, 68, 70); in that the flow directions of the two check valves (60, 62, 68, 70) are straightened; and in that the valve (68, 70) located downstream in the direction of flow is subjected to a prestressing li-   reducing the internal pressure of the closing part (16).   2. Closing of borehole according to claim 1, characterized in that the closure part (16) has the form of a pipe.   3. Closing of borehole according to any one of claims 1 and 2, characterized in that the two heads valve (12, 14) are connected by a rigid spacer   (38) which passes through the closure part (16).   4. Borehole closure according to claim 3, characterized in that the spacer (38) is made as a tubular piece connecting the valve heads (12, 14)   and the wall of which is provided with perforations (80).   5. Closing of borehole according to any one of   Claims 1 to 4, characterized in that the two valves (60, 62, 68, 70) are prestressed in the closing direction   and in that the valve closing voltage (60, 62) is- killed upstream in the direction of flow is smaller than the   valve closing voltage (68, 70) located downstream.   6. Closing of borehole according to any one of Claims 1 to 5, characterized in that the closing voltage   valve (68, 70) located downstream in the direction of the flow is adjustable.   7. Closing of borehole according to any one of   Claims 1 to 6, characterized in that the valve head   (12) located upstream in the direction of flow is provided with a   fitting (54) for a pressurized agent conduit. 8. Closing of borehole according to any of the - 6 - claims 1 to 7, characterized in that the valves (6 (0 62, & 8o 70) are made to comie des villes à billeo 9o Ferïesture de treu de sondaee according to any one of re ndi3tinr! tB2 8 atrisee n ce au oinsz une cor ps d1e oae î: 1-, 20 du Vp evmcaoppe dee stte de valve (i20 S4) t pse a, Qe gere synO "thiqUeo 0o Frsure de.:o de sendape according to any doc ree.onc. edPe, o only 1l p28caed r-csa li75b i3i J ret EtliO if Qi) 12 r! E _ytSh03 (-iq; le OI