DE1921084B1 - Hydraulically setting dry mortar powder - Google Patents

Description

1 2

The invention is based on the object: and water fills existing pulp. The establishment

..... ",,, .... of closing dams is a very complex and

1. Gas-tight and viable roadside dam is a wage-intensive process.

prepare for decarbonized mining fields _for stratum consolidation and sealing of

2. Cavities between expansion and eruption ₅ seepage water, a cement slurry is used, which is filled in cross-section in mining pits by means of a probe located in a sealed borehole, pressed into the upcoming rock

3. a flexible spray coating in bulges and becomes. Due to seepage water it often happens that Cuffs in the circumference of the route with a high level of the cement slurry is washed out and thus To establish strength, the whole effect is useless.

4. Sufficiently strong coatings on crates as ^it has surprisingly been found that abutments of ^{barrier dams to save 2} ^ "solution of the present invention based on barrier walls to be erected pose the problem of avoiding the disadvantages and the known method a hydraulically binding

5. To consolidate the mountains and to discharge seepage water, dry mortar ^{powder of the following densities.} Settlement is excellently suited:

The following is known to solve this problem. 20.0 to 65.0 percent by weight of a hydraulic

There are binders in the transverse direction to the mining stretches,

the mining fields. To expand the mining routes 20 ₀ , 2 to 6.0 percent by weight calcium chloride

to protect, self-ignition due to bad weather (anhydrous),

to prevent currents in the old man and by avoiding 76.8 to 30.0 percent by weight of a lime marl avoiding weather losses through the charred ^ "^^ Ιεω ₅ o / _clay share,
Room to avoid climatic difficulties in the face, «, ... ~" • - ,. ■, ·,,
prevent, in addition, parallel to the mining 25 ³ > ° ^{to 15} > ° percent by weight of a weakly stretched to support the hanging wall in the already burned cement clinker, preferably decarburized part of the mining fields, wooden pillars are erected, ^ ^iron Lepolo brick bricks are then filled with mountains and, if necessary, closed - Liter weight (determined from the Fraksetzlich to be sealed. The wooden pillars should absorb? Οη 5 to 7 mm) less than the pressure of the hanging wall layers, while 30 ¹⁰⁰ O g / ¹ »preferably 600 to 800 g / l, the mountains with an additional Sealing for ^, however, a complete avoidance of weather losses should serve, in order to acidify the raw material, the weather management in the mining routes must be ensured.

improve. The wooden pillars' are on a width of τ- · ΐ_ τ ± ji_j

τ · L * .Γ T ^ 1 '* · j ι. ·· λ jo A preferred composition of the hydraulic

about 3 m erected. However, it often happens that 35 _r r, _{Λ / Γ} . _t , ■ _t

^{The mining routes are} subsequently continuously read out again iViorteis Actual ·

need to be improved; the wooden pillars can contain 54.0 percent by weight of cement clinker,

absorb the mountain pressure insufficiently, there. _nnn . ,,. "",.,. ,.

j, 1 · 1. -ο · τ * 1 * t. · 40.0 percent by weight of marl lime with at least

due to uneven pressure absorption only one. ,,. λ. _, °

1 ^ r- τ. 1 ^ χ. * Τ- -4.J- 5 percent by weight clay,

punctiform loading is given. Furthermore, the 40 ^L

Gas seal - at least without additional measure - ¹ ^ percent by weight potassium chloride (anhydrous)

took - inadequate because the loose between ^and

Mountains brought into the pillars gas-permeable 5.0 percent by weight of lightly fired Lepol-

are. oven clinker.

Cavities between the extension and the excavation transverse 45

In mine workings, only those cut by joint grinding of the pre-

packed with hand mountains. As a result, the components given in the upright position result in homo-

Mixture possibly accumulated in methane in cauldrons is blown by means of a blower

lungs or in any case not weathered blown dry and in a mixing nozzle such

Place. "5 ° amount of water sprayed that a plastic pulp

To produce a flexible spray coating in which is then pressed against the abutment

Bulges and cuffs in the circumference of the route can be injected. The amount added

with high strength is a cement-rock dust-water, based on the mixture, between

slurry applied with good success where 23.0 and 40.0 percent by weight; the preferred one

only low strengths are required. If 55 water content is 27.5 percent by weight. Of the

while higher strengths are required, the known addition of calcium chloride to hydraulic

including cement mortar mixes. An aftertaste of binders has no effect aside from the per se

Part of these hardened cement mortar mixes is a quick liquefying effect desired

their brittleness, so that the spray coating already begins to harden. To prevent that because of

flakes off with the slightest pressure. At the end off ⁶ ° the liquefying effect of calcium chloride, the

Looted mining roads will be dams in the lower against the abutment, injected mass flows away

Open-day operation of the hard coal mining in the manner of a mixture of lightly burned Lepolo clinker bricks

manufactured that one added in the robbed routes. The weakly burned Lepolo brick brick

at the end of the dam and at the beginning of the dam retaining walls binds part of the added water, with which

erected and the 65 formed by these walls an immediate stiffening of the mass occurs. These

Cavity initially with a mountain offset and then with mass is then no longer flowable and sticks in front of

a pumpable one, made of practically pure high - all because of the tone that is present to the

percent limestone powder, possibly cement built abutments.

A test of the compressive strength of the hardened mass at different temperatures according to 6 to 28 days resulted in the following values:

Test date

6 hours
24 hours

3 days
28 days

temperature

2O ⁰ C

30 ⁰ C

15 kgf / cm ²

80 to 100 kgf / cm ²

about 160 kgf / cm ²

^ 300 kp / cm ²

20 kg / cm ² 100 to 125 kg / cm ² about 160 kg / cm ² ^ 300 kg / cm ²

The test results show that, at a higher temperature, initially higher strengths can be achieved.

Increasing the amount of cement clinker at the expense of the Kallan gel increases the amount Strengths achieved; but then there must be a marl of lime with a relatively high content of clay be used to gas tightness of the end dam od. The like. To achieve.

ψ The use of the mixture according to the invention has the great advantage that routes heavily used can relieve the underground operation by blowing the mixture in pipelines over long distances.

With the aid of the mixture according to the invention, gas-tight and Build stable roadside embankments by placing this mixture against abutments, e.g. B. a Timber crate or a weather-cloth barrier splashes and thus continuously builds the accompanying dam. the The compressive strengths achieved after 24 hours are higher than the strengths of the logs. At the same time is In contrast to the known method, gas tightness is guaranteed.

With the mixture according to the invention, cavities can be created between the expansion and excavation cross-section Filled gas-tight and injections of bulges and cuffs of high strength but can also be carried out with great flexibility.

Furthermore, instead of masonry walls, the mixture according to the invention can be used on Establish sufficiently strong abutments at the beginning and at the end of embankments by using the Sufficient strength of the mixture is sprayed onto the crate and the cavity is gas-tight after it has hardened can be filled with an aqueous slurry of rock dust and cement. So you save the wage-intensive and laborious work to erect closing walls.

The mixture according to the invention is very suitable for consolidating mountains and for sealing of seepage water, because the clay contained in the limestone marl penetrates into and through the finest capillaries the swelling of the clay blockages and also high strengths can be achieved.

Claims (2)

Patent claims: 1. Hydraulically setting dry mortar powder, characterized by its Composition of: 20.0 to 65.0 percent by weight of a hydraulic binder, 0.2 to 6.0 percent by weight calcium chloride (anhydrous), 76.8 to 30.0 percent by weight of a lime marl with at least 5% clay,
3.0 to 15.0 percent by weight of a lightly fired cement clinker, preferably Lepolo kiln clinker with a liter weight (determined from the fraction 5 to 7 mm) of less than 1000 g / l, preferably 600 to 800 g / l, although complete deacidification of the Raw material must be guaranteed. 2. Hydraulic mortar according to claim 1, characterized by a content of: 54.0 percent by weight cement clinker,
40.0 percent by weight of lime marl with at least 5 percent by weight of clay,
1.0 percent by weight calcium chloride (anhydrous) and 5.0 percent by weight of lightly fired
Lepolo kiln clinker.