CN1215792A

CN1215792A - Sand pressure release double arch semi-enclosed support technology for soft break rock mining roadway

Info

Publication number: CN1215792A
Application number: CN 97115978
Authority: CN
Inventors: 刘照朗
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-25
Filing date: 1997-10-25
Publication date: 1999-05-05
Anticipated expiration: 2017-10-25
Also published as: CN1133795C

Abstract

A semi-enclosure support technology for the mining gallery in soft and fracture rock features that drift sand pressure-relief unit and steel arch constitute a quickly installed flexible arch frame, which is then used as a bearing and moulding structure of the second layer of sprayed reinforced concrete arch to form an enclosed dual-arch support band. Only metallic net is hung between the enclosed arches to support fracture rock and allow the surrounding rock's rheid and roof fall for relieving pressure. The bands are alternatively arranged at same intervals. Before actual mining, the quickly installed arch and metallic net are detached. Its advantages are reliable support, easy operation and lowering cost by 50%.

Description

The sand pressure release double arch semi-enclosed support technology in soft break rock mining tunnel

The invention belongs to the mining technique field.

It is to press according to the ground of mining tunnel in the soft broken rock under the high stress to manifest rule, to traditional anchor net spray, build arch, hydraulic prop, the steel bow member, support forms such as log hut are reformed and a kind of novel support process founded, in Shandong Province's rock mechanics annual meeting of holding in August, 1997, the ground of introducing the soft broken rock stope of paper ＂ of this technology press manifest improve ＂ and deliver with support process after, the participant expert is consistent to be thought: the technology mode of this technology and supporting mechanism demonstration belong to domestic initiation, also do not see the similar techniques report abroad.

The purpose of this invention is the stable of mining tunnel supporting in the rock of realization weak broken ore deposit, safety, easy and consumption reduction.

The supporting pattern is shown in Fig. 1, Figure 1A, and main contents are as follows:

1,10～15 on 3～5+M12 of 4+quicksand of steel arch release son 2+headblock sheet bolt is formed the fast-assembling bow member, and the steel arch is made and seen Fig. 2, Fig. 2 A, Fig. 2 B; Quicksand release is made and is seen Fig. 4, Fig. 4 A, and Fig. 4 B, Fig. 4 C,

2, bamboo (bar) basketry is many, and wide 300 ~ 400MM ties up and is affixed on the steel arch outside; 12 of timber wedges (40MM*600MM*120 ~ 200MM, on-the-spot fixed) are tightly filled in arch and crag gap, are used for steel arch location, protect the top temporarily and serve as the concrete arch flexible layer: 10 ~ 12 pairs of reinforcing cages, make as Fig. 3, and install between timber wedge; With bamboo (bar) basketry is that loose tool is constructed sprayed mortar arch, clad ＂ O ＂ type reinforcing cage, expose ＂ W ＂ type link and be full of basketry and crag between number, the thickness of arch is not less than 120MM.

3, prefabricated metal net multi-disc, wide 250 ~ 300MM, length is made by oneself, and grid 80MM*80MM hang on the link that concrete arch exposes, the semi-enclosed support band of meaning (protecting band is propped up in the sealing of two arch meaning), confining zone and semiclosed band roughly wait width to arrange at interval.

4, the requirement of construction and management is: with propping up, fast-assembling spring base work plane is not more than 2.0 meters with pick, sprays the spring base work plane and is not more than 6.0 meters; To locate with backstay when the fast-assembling bow member is installed, and lift (figure slightly) with vertical loading board; Quicksand release prepackage quartz sand (0.5mm, 1.0mm, each 1/3 grating of 1.5 2.5mm) is most probably full, can put sand during the supporting as one feels fit and make bow member sinking release, removes for the release of steel arch but must keep three one-tenth above sand amounts; Wire lath is loaded and can manually be dredged dribbling when excessive with release and repair damaged; During stability of the roadway fast-assembling arch can remove in advance or before back production progressively apart from removing (wire lath also should reclaim), the reinforced concrete arch back production avalanche of then sacrificing one's life for; Parts such as steel arch, release, wire lath should be listed fixed capital management in, are coated with the antiseized cement paste of butter during use, and mopping is antirust during placement.

Supporting mechanism is: flexible two arches can be reinforced sealing zone circle rock, its compressive strength under two-way constraint is increased be the several times of single shaft intensity; Semiclosed band makes water-swellable rock and soft broken rock be able to the rheology release of pressure; Quicksand release+steel arch is formed fast-assembling arch replacement hydraulic support and has been realized that manufacturing and easy and simple to handle and cost reduce.

For the soft break rock mining tunnel, this technology is compared with conventional bolting and shotcreting with wire mesh, and sharpest edges have three: one, the Acceptable life of bolting and shotcreting with wire mesh only 3--6 month, and this technology can reach more than 15 months; Its two, be easy to rebuild maintenance because semiclosed band allows the country rock inbreak with release, confining zone then keeps the use section in tunnel and moulding constant substantially; They are three years old, owing to finally have only the back production avalanche of sacrificing one's life for of a reinforced concrete arch, so support cost is cheap, a scrap cost of the every joint supporting of this technology length (confining zone+semiclosed band=0.8 meter) is a 300--350 unit, depreciable cost is a 100--150 unit, is about the 50--60% of anchor net spray support cost.

Fig. 1 is among Figure 1A: 1--timber wedge, 2--steel concrete, 3--headblock sheet, 4--steel arch, 5--quicksand release, 6--wire lath.Fig. 2, Fig. 2 A, Fig. 2 B are steel arch shop drawings, among Fig. 3: 1--8# reinforcing bar ＂ W ＂ type link, 2--6# reinforcing bar ＂ O ＂ type reinforcing cage.Fig. 4, Fig. 4 A, Fig. 4 B, among Fig. 4 C: coupling (1) and sand piston (3) welding, (2) are the location semi-ring, (4) are joint ring, sand cylinder (5) and base (9) welding, sand valve seat (7) is adaptive with sand cock (8), and (6) are quartz sand.

Claims

The sand pressure release double arch semi-enclosed support technology in soft break rock mining tunnel.The invention belongs to the mining technique field.Its major technique characteristics are: quicksand release+steel arch is formed flexible fast-assembling bow member and is constructed second layer steel concrete injection arch as supporting and moulding loose tool, the synthetic sealing protecting band of two arches.Only hang wire lath support rubble and allow country rock rheology, inbreak with release between the sealing arch, width such as two bands are arranged at interval.Remove fast-assembling arch and wire lath before the back production, only stay the concrete arch back production avalanche of sacrificing one's life for.