CN2040535U

CN2040535U - Magnesite concrete strut

Info

Publication number: CN2040535U
Application number: CN 88215135
Authority: CN
Inventors: 李懋龄; 张共和; 宋海南
Original assignee: GAOKENG COAL MINE
Current assignee: GAOKENG COAL MINE
Priority date: 1988-10-25
Filing date: 1988-10-25
Publication date: 1989-07-05

Abstract

The utility model relates to a magnesite concrete strut, which is mainly processed and manufactured by magnesite concrete and bamboo ribs and is a novel pitprop substitute of the mining industry. The utility model is characterized in that the wood can be cut, sawed and nailed and that the support force is big, having the advantages of light weight and low cost, and being able to be used as the pillar of the extracting face in small-and-medium-size coal mines and medium-thickness seam, the canopy leg for entry and propping branch for carrying the canopy.

Description

Magnesite concrete strut

The utility model is a kind of magnesium oxychloride concrete pillar.It is mainly formed by magnesium oxychloride concrete and bamboo reinforcement processing and manufacturing.It is a kind of novel supporting in down-hole, mine.

Magnesium oxychloride concrete, primary raw material comprise magnesium oxychloride, magnesium chloride, sawdust, cigarette ash, slag etc.In the prior art, magnesium oxychloride concrete is used to make magnesite plate, decorative panel and so on, is used for the usefulness of freight transportation packing and house decoraton.But make pillar and be used for down-hole, mine genus initiative.

In down-hole, modern mine, main support material has metal mainstay, cement pillar and wooden prop.In middle-size and small-size mine, use the ratio of wooden prop very big.Timber is the indispensable important substance of economic construction and people's lives.In China's coal-mine, the annual mine timber that consumes all accounts for 1/4th of national timber sendout.The purpose of this utility model is to provide a kind of novel substitutes for timber product for the mining industry.It not only has the characteristics of mine timber supporting, and in light weight, cost is low.

Fig. 1, Fig. 2 are respectively the desirable pillar figure of the utility model.

In the utility model pillar, all be furnished with vertical fixing bamboo reinforcement (1).The pillar of cross sectional shape such as Fig. 1 is applicable to that down-hole, mine stope uses.Its working resistance can reach 19.3 tons, and safety factor is 2.95.The pillar of cross sectional shape such as Fig. 2 is applicable in the stope drift active workings of down-hole, mine and uses.Its group presses maximum concentrating to cut 1.80 tons of He Keda, 2.07 tons/meter of uniform section He Keda, and the maximum roof pressure that can bear can reach 24.5 tons, and safety factor is 2.57.

The utility model is achieved in that the admixture cigarette ash that meets sawdust less than 20% of the magnesium oxychloride of table one index, the enriched bittern cake that meets table two index or bittern, moisture content, meets table three index is blended together, stirs.The maximum deviation of each raw material should meet table four requirement when magnesium oxychloride concrete stirred.And then the magnesium oxychloride concrete that stirs is poured in the template of being furnished with rib of column support type and goes.Rib adopts bamboo reinforcement.Requiring wide to bamboo reinforcement is 10～20 millimeters, and tensile strength is not less than 1200 kilograms every square centimeter.During the cloth muscle, necessary assurance is smooth, and vertical fixing, deviation should be above 5 millimeters.In order to guarantee the pillar Forming Quality, the method that preferably adopts laminated pouring and layering to make firm by ramming.During cast, the earlier auxilliary needed mix of layer protective layer is put into bamboo reinforcement after the tamping, and auxilliary again mix is made firm by ramming.Cast so repeatedly, last moulding.The product of moulding by casting should maintenance 28 days in the dry environment more than 20 degree Celsius.Curing time, should not be subjected to exposure in sunshine.

The chemical analysis of magnesium oxychloride, mechanics index of physics (table one)

The material deviation requires (table four)

For guaranteeing the quality of magnesium oxychloride concrete, enriched bittern cake, bittern should leave in the pond of lid.Sawdust requires not have and rots, and uses 500 mm sieves during use and sifts out impurity.When stirring first cylinder, should increase by 5% magnesium oxychloride, remedy the loss that is bonded at parts such as barrel.The mould plate material preferably adopts steel plate, in order to avoid buckling phenomenon appears in product.

But the utlity model has the characteristics of cutting, can saw ailing of mine timber.Support force is equivalent to the garden pine of 140～160 millimeters of equal length diameters.Compare with the rigid metal pillar, have cost low, in light weight, use and to reclaim advantage easily.In the down-hole, mine, making back production pillar permission support force is 19.3 tons, and making tunnel canopy leg permission support force is 24.5 tons.Use in stope and tunnel thin at middle and small scale coal mine and medium-thickness seam, can play the good effect of saving mine timber.

Claims

1, a kind of magnesium oxychloride concrete pillar, it is stirred cast and is formed by magnesium oxychloride, enriched bittern cake or bittern, sawdust, cigarette ash, it is characterized in that being furnished with in the pillar vertically disposed rib (1).

2, pillar according to claim 1 is characterized in that the rib of perpendicular what arrangement is made by bamboo and wood materials.