roof hole

用法例句

The gas management technology of the roof rock boreholes is described as follows:applies the boreholes arranged in the roof,under the action of the drainage pump negative pressure,changes the flow direction in the goaf fall district and crack district,makes it into the wind rodaway,reduces the wind gas amount,controls the corner gas accumulation.

顶板岩石钻孔抽放瓦斯技术,主要是利用布置在煤层顶板中的钻孔,在抽放泵负压作用下,改变采空区冒落带和裂隙带内积存的瓦斯流向,使其直接进入回风巷,减少工作面的风排瓦斯量,控制上隅角瓦斯积聚。

Experimental study of vertical wave forces acting on perforated caisson with top cover

规则波作用下有顶板开孔沉箱垂直波浪力试验研究

Technology of 1000 meter directional borehole at large diameter for mine gas extraction

顶板大直径千米长钻孔抽采瓦斯技术

Study the technique of caving hanging roof in the condition of hard roof of room-and-pillar mining.;

房柱式开采坚硬顶板条件下悬顶放顶技术研究

Study on Natural Ventilation of Urban Tunnel with Upper Vents;

市政公路隧道顶部开孔自然通风研究

He had noticed, at the top of the Pyramid of the Inscriptions, a stone slab with holes in it.

他注意到在铭文金字塔顶部有一块带孔的石板。

Application of Technology of High Gas Cannon Picking Roof Perforate Gas Administer

高瓦斯炮放面顶板钻孔法瓦斯治理技术应用

Pressure releasing and gas drainage with long bore hole in roof overburden of fully mechanized caving face

综放面顶板覆岩走向长钻孔卸压抽放瓦斯研究

The rating curve between the flux of the pulverized coal and the tob pressure and aperture of orifice-plate flow meter is a parabolic one.

煤粉流量与顶压及孔板直径成抛物线关系。

On Install Technique of GEOKON 4300 Vibrating Wire Stress Appearance;

振弦式孔应力仪在复合顶板中的安装技术分析

Fire Prevention Practice on Drilling Holes with Inclined Slices on Fully Mechanized Face Roof of Thick Seams in Junde Colliery

峻德矿特厚煤层综放面顶板下斜钻孔防火实践

Research and application of deep hole advance pre-blasting in hard roof of steeply dipping seam mining

大倾角坚硬顶板深孔超前预爆破研究与应用

Application of Gas Drainage in Fractured Zone by Roof High-level Boreholes in Daping Coal Mine

顶板高位钻孔裂隙带抽放在大平矿的应用

Gas drainage technique by 1000 m long and large diameter roof boreholes in high gas coal seam group

高瓦斯煤层群顶板大直径千米钻孔抽采技术

Research on Non-coupling Charging Coefficient in Softening Hard Roof with Deep-hole Blasting

深孔爆破弱化坚硬顶板不耦合系数研究

Close sunroof to center glass panel in roof opening.

关闭遮阳蓬顶至车顶开口处的中心玻璃板。

Upper plate and lower plate design with subsection and with in-out hole for different choice.

顶板及底板采用分段式设计,并设有进、出细孔,方便客户选择.

The Research in Large Tilt Angle Coal Seam Mining of Its Plank Moving and Controlling;

大倾角仰斜开采采场顶板控制的研究

Crack Treatment of Basement Roof in Stress Concentration Condition

应力集中作用下地下室顶板开裂处理