1.0.l This code is formulated with view to strengthening the quality control of shaft sinking and drifting, unifying acceptance of shaft sinking and drifting of coal mine and guaranteeing the work quality.
1.0.2 This code is applicable to quality acceptance of shaft sinking and drifting.
l.0.3 The requirements for construction quality in the contract agreement and engineering technical document in terms of the shaft sinking and drifting shall not be less than those specified in this code.
1.0.4 The acceptance of shaft sinking and drifting of coal mine shall comply with not only this code but also the requirements in the current relevant ones of Chinas.
2 Terms
2.0.1 Shaft
The passage to link the ground and underground roadway, including vertical shaft, inclined shaft and adit. The vertical shaft consists of shaft collar, shaft body, shaft crib and shaft sump and the inclined shaft and adit consist of the shaft (adit) opening, body and connections.
2.0.2 Major roadway
The generic term for shaft stationroadway, electromechanical chamber, main haulage roadway and main return airway.
2.0.3 General roadway
The roadway other than the major roadway and other chambers, and the generic term of cross heading and return air course at the mining district, side walk, etc.
2.0.4 Percentage borehole vestiges
The ratio of borehole quantity with visible vestiges to the total borehole number at the periphery excluding the floor after the smooth blasting. The borehole vestiges length greater than 70% of borehole length is regarded as visible borehole vestiges. The percentage borehole vestige is one of main indicators to check the quality of smooth blasting.
2.0.5 Blind shaft
The passage used for lifting, ventilating, conveying materials or laying the line and convenient for the personnel to go up and down between the two flat beds.
2.0.6 Honeycomb
The defects on the concrete surface due to short of cement paste, loosening of aggregate cementation and the exposure out of the stone by over 5mm but less than the protective layer thickness.
2.0.7 Surface void
Defects on the concrete surface generated due to short of cement paste, loosening of aggregate cementation and with depth greater than protective layer thickness but less than or equal to 1/3 of masonry's section dimension.
2.0.8 Anchoring force
Binding effect of anchor bolt to the surrounding rock.
2.0.9 Pullout resistance
Force to protect the anchor bolt against being pulled out of the rock mass.
2.0.10 Reinforced concrete arc plate
The plate which is assembled by 4~8 circular arc reinforced concrete precast members and filled and grouted behind the wall.
2.0.11 Coarse stone
The hexahedral stone in a regular shape with convex-concave surface depth not greater than 20mm and its thickness and width are not less than 200mm and the length is not greater than 3 times the thickness.
2.0.12 Fine stone
The hexahedral stone in a regular shape with treated convex-concave surface depth not greater than 2mm and its thickness and width are not less than 200mm and the length is not greater than 3 times the thickness.
2.0.13 Non-mortared joint
Defects between the joint of two masonry blocks where the mortar bed is not masoned.
2.0.14 Dry joint
Defects of mortar at two masonry blocks, looking not plump and with a gap possibly to be poked through.
2.0.15 Construction joint
The joint formed at the two poured concrete in the concrete pouring when the pouring in segment is needed due to the design requirements or construction requirements.
2.0.16 Shaft lining floating and sinking
An operation in which the precast pan bottom is continuously connected with the shaft wall, in the shaft filled with mud to overcome the mud flotage so that it can sink slowly to the shaft bottom after the sinking lining by drilling method is completed.
2.0.17 Cementing(wall back grouting filling)
In the construction of drilling method, an operation in which the lining is downward injected into the gelling through the annular space from pipeline to lining outside and lining side after the lining sinks to the bottom so that the mud is cemented out to consolidate the lining. The mortar liquid has a specific gravity greater than mud.
2.0.18 Bolt mesh back support
The bolt mesh support, located on the mesh surface, is closely sticked against the materials to lay the steel beam, steel strips, steel bar and reinforced concrete plate and fixed by the anchor bolt.
2.0.19 Prestressed anchor bolt(cable)
Anchor bolt which consists of anchor head, prestressed bar and anchoring body and is provided with the active support tension by the pre-applied force on the anchor bolt.
2.0.20 Mud protection wall
A method by which the static pressure of mud within the shaft (hole) is used to balance ground pressure and hydraulic pressure and penetrate the mud into surrounding rock to form a mud cake to maintain the shaft (hole) upper, when the shaft is drilled and constructed in the drilling method and freezing method.
2.0.2l Connection of Shaft Bottom Station(Inset)
Variable cross section chamber of transition section for connecting shaft and shaft station roadway.
2.0.22 Main haulage line
Generic term of major under-well inclined shaft gug, shaft bottom station, major main haulage roadway and main haulage cross cut, overground coal and gangue haulage trunk line and centralized loading station yard.
2.0.23 General haulage line
Haulage line other than the main haulage line, excluding temporary roadway for coal mining and driving face.