CN87216389U - Retractable arch with high strength - Google Patents

Retractable arch with high strength Download PDF

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Publication number
CN87216389U
CN87216389U CN 87216389 CN87216389U CN87216389U CN 87216389 U CN87216389 U CN 87216389U CN 87216389 CN87216389 CN 87216389 CN 87216389 U CN87216389 U CN 87216389U CN 87216389 U CN87216389 U CN 87216389U
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CN
China
Prior art keywords
support
shaped steel
retractable
capacity
external layer
Prior art date
Application number
CN 87216389
Other languages
Chinese (zh)
Inventor
董显枢
Original Assignee
董显枢
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 董显枢 filed Critical 董显枢
Priority to CN 87216389 priority Critical patent/CN87216389U/en
Publication of CN87216389U publication Critical patent/CN87216389U/en

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Abstract

The utility model relates to a retractable arch with high strength support for a mine tunnel of soft rock, composing an external layer circular arch and an inside layer retractable U_shaped steel support frame, wherein, the external layer circular arch adopts the framework of putting a retractable shim plate and a mortar in low grade between an abnormity ashlar. The external layer circular arch which is mainly provided with the ashlar not only has the advantage of higher capacity of bearing, but also the external layer circular arch has the advantage of higher capacity of retraction by means of the support of the framework. The external layer circular arch deformates according to a concentric circle by means of the inside layer retractable U_shaped steel support frame. So the support has the advantages of higher capacity bearing and capacity of anti kinetic pressure. The utility model has the advantages of convenient construction, low cost. When the pressure of a surrounding rock is to uniform and the simply circle deformation is probable, the U_shaped steel support frame can be reclaimed entirely or partially. So the rate of reuse of metals support materials is enhanced.

Description

Retractable arch with high strength
The utility model relates to a kind of soft rock mine roadway support, particularly has contracting of high strength and high anti-dynamic pressure ability
Soft rock roadway support has various ways at present, consults " coal science and technology " 1987 the 3rd interim " soft rock classifying and support form select academic discussion to sum up " literary compositions, and supporting commonly used has the work stone circle , its intensity height, supporting capacity is big, but its flexibility is little, and it is big to be difficult to the inner potential of suitable for surrounding rock, surrouding rock deformation, displacement is big, the characteristics of distortion longer duration, and then cause unstable failure.The supporting of another kind of form is a U shaped steel compressibile support, and it adopts four joint U section steel manufactures to become, and overlaps certain-length between joint and the joint, pulls locking with bolt, card.When external applied load surpassed U shaped steel joint frictional resistance, the joint began to shrink, and country rock releases energy, and pressure reduces.Though it has contractibility preferably, do not possess high supporting drag and good sealing.Also having a kind of is anchor spray and U shaped steel combined supporting, promptly country rock is sprayed a layer concrete, and the sealing country rock is beaten anchor pole then, through after a while, allows country rock through after the peak of deformation, sets up the U shape steel bracket, and then multiple pneumatically placed concrete.This supporting has higher support capacity and can the amount of contracting, and sealing performance might as well.But its cost is higher, selects for use to be subjected to certain limitation.
The purpose of this utility model is at above-mentioned technical problem, proposes a kind of new supporting, can satisfy the high resistibility requirement of soft rock workings subject to dy namic pressure supporting, again can convenient construction, reduce cost.
The utility model is achieved in that outer the be special-shaped work stone and the alternate circle that is built into of backing plate that can contract , orbital plane is with the gap filling low grade mortar on top, and orbital plane is with the broken spoil of the gap filling of lower part.Internal layer is a contractibility U shape steel bracket, and per vertically three times work stones set up a U shaped steel compressibile support.
The utlity model has significant advantage: it can bear dynamic pressure and the coal mining dynamic pressure influence that tunnelling causes, and its compressive strength is general work stone 3 times, be that 29kgU shaped steel can contract 6 times of circular support, thereby obtain desirable supporting effect that simultaneously also improved coal winning technology, changing the pneumatic pick coal breakage is explosion coal-falling, improves coal mining efficient.Adopt this utility model can change roadway arrangement, a large amount of cross cutting expenses are saved in cancellation crossdrift tunnel.The utility model easy construction, cost is lower, and is tending towards evenly in pressure from surrounding rock, no longer occurs under the non-circular distortion situation, can all or part of recovery U shape steel bracket, thus improved the reusability of support material.
Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is described in detail:
Fig. 1 is that high strength can contract Schematic cross-sectional view.
Fig. 2 is that high strength can contract Axial sectional schematic diagram.
Fig. 3 is a testing gallery supporting deformation curve.
Referring to Fig. 1, Fig. 2, supporting is outer to be thick 0.4m, major part 0.2 * 0.2m, the special-shaped work stone 1 of microcephaly 0.2 * 0.16m and contracted backing plate 2 alternate being built into that 0.2 * 0.4m, thickness are 0.02~0.04m, and the backing plate 2 that can contract can be made by the magnesia plate of cement, plank or magnesia, bittern and wood chip combination.The low grade mortar that orbital plane is made up of lime, cement, river sand with the gap filling on top, orbital plane is with the broken spoil of the gap filling of lower part.The supporting internal layer has by bracket clamp pulls the 5 25kgU shaped steel compressibile supports 4 that connect, and promptly counts per three times work stones vertically and sets up a U shaped steel compressibile support 4, lifts work stone twice, empty one time, for the wall post gap greater than 0.2m, broken spoil of filling or river sand.The first half allows working between internal layer and skin Plate 3.
The utility model began to have carried out type approval test in the big lane of six nearly seat earths, north, Shenyang office Qian Tun colliery in August, 1986, experiment length is 170m, this tunnel was dug 16 months, the dynamic pressure influence that itself has caused when not only having stood driving, begin and stood the coal mining dynamic pressure to influence April in this year, so far the tunnel still is in serviceable condition, and the double-deck work stone in the big lane of seat earth far away at sustained height, distance test horizontal range 80m place, lane Heavy damage, have to take gunnite method to be reinforced, the testing gallery deformation curve as shown in Figure 3, tunnel vertical average deformation amount 145.8mm, maximum 250mm, the average deflection 110.8mm of level, maximum 131.5mm has reached designing requirement, gives meter (about 6 years) in the whole period of service and need not turn over block, U shaped steel can reclaim the year ends one nine eight eight, and reusability can reach more than 80%.

Claims (3)

1, a kind of soft rock mine roadway support comprises circle Form with the contractibility supporting, it is characterized in that circle By the special-shaped work stone 1 and 2 alternate compositions of backing plate that can contract, orbital plane has the low grade mortar with the gap filling on top, orbital plane with the gap filling of lower part broken spoil, circle In the uniform vertically U shaped steel compressibile support 4 that sets up.
2, roadway support according to claim 1, the backing plate 2 that it is characterized in that contracting is cement board, plank or magnesia plate.
3, roadway support according to claim 1 is characterized in that circle In count per three times work stones vertically and set up a U shaped steel compressibile support 4.
CN 87216389 1987-12-11 1987-12-11 Retractable arch with high strength CN87216389U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 87216389 CN87216389U (en) 1987-12-11 1987-12-11 Retractable arch with high strength

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 87216389 CN87216389U (en) 1987-12-11 1987-12-11 Retractable arch with high strength

Publications (1)

Publication Number Publication Date
CN87216389U true CN87216389U (en) 1988-07-20

Family

ID=4830338

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 87216389 CN87216389U (en) 1987-12-11 1987-12-11 Retractable arch with high strength

Country Status (1)

Country Link
CN (1) CN87216389U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1936270B (en) * 2006-10-20 2011-03-16 中国水电顾问集团华东勘测设计研究院 Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method
CN107893665A (en) * 2017-11-06 2018-04-10 山东建筑大学 A kind of prefabricated assembled composite supporting construction mounting process based on shaped steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1936270B (en) * 2006-10-20 2011-03-16 中国水电顾问集团华东勘测设计研究院 Multilayer enclosing-rock cement-grouting consolidation ring tunnel bearing structure and its construction method
CN107893665A (en) * 2017-11-06 2018-04-10 山东建筑大学 A kind of prefabricated assembled composite supporting construction mounting process based on shaped steel
CN107893665B (en) * 2017-11-06 2019-07-05 山东建筑大学 A kind of prefabricated assembled composite supporting construction mounting process based on fashioned iron

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Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
C14 Grant of patent or utility model
C15 Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993)
C19 Lapse of patent right due to non-payment of the annual fee