Nghiên cứu đề xuất thiết bị công nghệ thi công neo bê tông cốt thép nhằm phát triển áp dụng chống lò

Thong tin khoa hoc cong nghe m o

^ NGHIEN CCJa t)E XOfiT THIET Bj CONG NGHE THI CONG

NEO BE TONG COT THEP

NHAM PHAT TRIEN AP DUNG CHONG LO BANG vi NEO

Up to now, anchor bolts used together with shotcrete has

been the lightweight supporting structure applied to the

underground constructions. However, this type of the

supporting form has been so far not widely used in the

supporting works in mines in Quang Ninh coal basin. One of

the main reasons is the limitation in their execution process.

The paper refers to the techndogy and equipment with using

the reinforced concrete anchor bolts for increasing their

application in supporting works in mines

TS PHAM MINH ei/C

Vl$n khoa hpc Cdng nghi Md- Vinacomin

Bien t$p: TS. Tnrtmg Duv Dif

Cong nghg thi cdng lap dat neo va nhCrng

vin dl cdn gidi quylt

Tgi cdc md him Id vCing Quang Ninh, tu tn^dc

din nay da dp dgng ching giu eac dudng Id ddo

trong dd vd trong than bang mOt s i logi vi neo,

nhu neo nem che, neo bd tdng cit thep (BTCT),

neo Ing hd ... vd gin day Id neo chat deo cit

thdp (CDCT), trong d6, dd san xuit dugc chat

ddo thay thi nh$p khiu.

* Neo n§m che (hinh 1): la logi neo dan gian

v l elu tgo. Phin cuoi thanh thep neo dugc xe

m6t ranh c6 ehilu ddi tir 20-30em. De neo mang

tai, chi cin ddng mgt chiee nem vdo phan ranh

culi thanh neo. Cd thi su dgng biJa hoac khoan

khi ndn d l ddng neo. Khod neo nem che mac du

elu tgo vd che tgo khdng phuc tap nhung d l

khod neo Idm vigc In djnh can sy phu hgp ve dp

bin cua logi da vd dp Idn lyc tdc dpng. De dam

bao yeu ciu tren Id tuang doi khd khan, vi the,

chP den nay neo ndm che it dugc dp dung.

' Neo CO hQC (hinh 2): nguyen tac Idm viee

cua khod neo eung tuang ty neo nem che, dp

bin cua dd qua eao hay qud thip deu khdng

thuan tien, do khod neo khdng md hoac khdng

bam dinh tit.

* Weo ong ho (hinh 3) vd neo ong phong: Id

loai neo Idm viec theo nguyen ly ma sdt tren todn

bO thanh neo vdi thdnh lo neo.

Khi dung mdy khoan ep Ing hd vdo Id neo,

Ing bj co, ndn tao lyc ep. 6ng hd ludn cd xu

hudng md, dan ra, Idm cho than neo ma sdt vdi

Sllrarrf^TfTTfrnTfTTTfiTTTrr?

Hinh 3. Neo dng hd

thinh Id khoan. Doi vo'i neo dng phdng, d l lim

viec, t^r\ bom dung dich de lim phdng dng neo.

* Neo BTCT va neo CDCT (hinh 4): l i lo?i

neo sy dyng chit bim dinh l i vu'a bd tdng hoie

chat deo. Vol neo BTCT, d l neo lidn kit v<n.

thinh Id neo phai bom, dun vu'a bd tdng vao diy

Id, sau dd lap thanh neo. Khi vO'a be tdng ddng

TTKllCNM S6 molS* CNKT HAM L 6