CN110107323A - It is a kind of elder generation hole after wall intersect hole excavation supporting construction method - Google Patents

It is a kind of elder generation hole after wall intersect hole excavation supporting construction method Download PDF

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Publication number
CN110107323A
CN110107323A CN201910387118.7A CN201910387118A CN110107323A CN 110107323 A CN110107323 A CN 110107323A CN 201910387118 A CN201910387118 A CN 201910387118A CN 110107323 A CN110107323 A CN 110107323A
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China
Prior art keywords
hole
tunnel
cavern
intersection
abutment
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CN201910387118.7A
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Chinese (zh)
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CN110107323B (en
Inventor
王鹏
石安池
李孙权
唐鸣发
周光辉
王敬勇
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Powerchina Huadong Engineering Corp Ltd
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Powerchina Huadong Engineering Corp Ltd
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Priority to CN201910387118.7A priority Critical patent/CN110107323B/en
Publication of CN110107323A publication Critical patent/CN110107323A/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D13/00Large underground chambers; Methods or apparatus for making them
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts

Abstract

The present invention provides wall behind a kind of first hole to intersect hole excavation supporting construction method; tunnel is excavated prior to cavern's abutment wall; system supporting extends tunnel into cavern after completing; it carries out gib and guarantees field construction safety; implement locked anchor bar and countersunk head anchor pole carries out intersection protection; along the circumferentially disposed pre- ceasma explosion of cavern's abutment wall; make rock mass separation inside and outside cavern's abutment wall near intersection; rock mass is excavated using machinery within the scope of presplitting when later period cavern excavation; secondary blasting is avoided to damage, system supporting follow-up is completed until completing intersection and excavating.The present invention provides a kind of scheme for solving the problems, such as large underground hole intersection excavation supporting for wall digging mode behind first hole, it can largely guarantee that molding is excavated in intersection, be conducive to tunnel intersection and cavern's high side wall adjoining rock stability, reduction is backbreak, later period a large amount of fill concretes are avoided, duration and engineering cost are saved.

Description

It is a kind of elder generation hole after wall intersect hole excavation supporting construction method
Technical field
The present invention relates to wall excavation supporting construction methods behind a kind of intersection hole elder generation hole, are suitable for the undergrounds such as water power water conservancy Engineering field.
Background technique
In modern water power hydraulic engineering, Underground Powerhouse Area cavern is huge, and the height such as main building, down stream surge-chamber is dynamic Often rice up to a hundred, diversion tunnel, bus tunnel, tailwater tunnel intersect with it, and height is also generally more than 15~20m, and quantity is extremely more, shape Intersection is passed in and out at a large amount of tunnels, these large-scale intersection stress conditions are complicated, and geological conditions difference is big in addition, crustal stress is high etc. Unfavorable factor, country rock relaxation after excavation, the problems such as collapsing, are more serious, and intersection is often backbreak seriously, and molding is very poor, is unfavorable for The high side walls adjoining rock stability such as underground power house or tail tune room, and slump position needs to use reinforced concrete earthen backfill, difficulty of construction is big simultaneously It results in waste of resources, how to reduce intersection country rock and backbreak, guarantee its molding and excavation quality is a no small problem.
Such intersects hole and excavates generally using 2 kinds of modes, the first is first to excavate the cavern underground power house Deng great, tunnel wheel Tunnel excavation is carried out after profile whole exposure, hole formula is excavated after referred to as first wall, is mainly used for small-sized or well-to-do duration cavern It excavates intersection;While being for second that cavern's higher slice excavates, lower part tunnel is synchronous to be excavated, and tunnel is initially formed, rear to be formed Big cavern abutment wall, referred to as wall is excavated behind elder generation hole, and which difference elevation, different parts cavern construct simultaneously, can largely save Duration is mainly used for huge cavern or duration tight tunnel chamber crossing mouth excavates.The first digging mode is more common, and second How digging mode solves the problems, such as that molding is excavated in intersection and adjoining rock stability there is no system schema.
Summary of the invention
The technical problem to be solved by the present invention is in view of the above problems, provide that a kind of structure is simple, construction party Just, wall intersects hole excavation supporting construction method behind first hole securely and reliably, for this purpose, the invention adopts the following technical scheme:
It is a kind of elder generation hole after wall intersect hole excavation supporting construction method, opened for large underground hole and tunnel intersection Digging and supporting, it is characterised in that: during cavern's higher slice excavates, while lower part tunnel permanent section excavation and supporting are carried out, Lower part tunnel permanent section excavate and supporting construction after the completion of tunnel excavation extended segment and implement gib, then carry out the friendship The construction of countersunk head locked anchor bar and pre- ceasma at prong carries out presplitting using pre- ceasma after the completion of the construction of countersunk head locked anchor bar Explosion makes rock mass separation inside and outside cavern's abutment wall near the intersection;
Stop explosion within the scope of the lower digging to tunnel permanent section hole presplitting of cavern's layering, being changed to machinery excavates, system Supporting follow-up, until intersecting the complete exposure in hole.
Further, the hole disposed inboard locked anchor bar of lower part tunnel permanent section, the locked anchor bar is circular layout more It arranges, prestressed anchor is used at side and roof arch, bottom plate uses ordinary mortar anchor pole.
Further, tunnel extended segment cross dimensions is identical as tunnel permanent section, sprays anchor in tunnel permanent section system Extended segment is excavated after linked network supporting and the construction of hole locked anchor bar, extended segment crown and abutment wall carry out the supporting of armored concrete spray-up Gib.
Further, the countersunk head locked anchor bar refers to that anchor pole does not leak outside, the anchor pole being arranged within the scope of designated depth, from Bolthole is made in extended segment country rock inclination to outside tunnel permanent section hole, and the bolthole divides on the outside of the abutment wall of cavern and 2 sections of inside, outside Side section injection Anchor Agent is simultaneously inserted into anchor pole, medial segment not slip casting not inserted link.
Further, the pre- ceasma along cavern's abutment wall a circumferentially disposed ring on the outside of the hole of lower part tunnel permanent section.
The beneficial effects of the present invention are: providing a kind of solution large underground hole friendship for wall digging mode behind first hole The scheme of prong excavation supporting problem, can largely guarantee intersection excavate molding, be conducive to tunnel intersection and Cavern's high side wall adjoining rock stability, reduction are backbreak, and later period a large amount of fill concretes are avoided, and save duration and engineering cost.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of countersunk head locked anchor bar in the embodiment of the present invention.
Fig. 3 is the arrangement schematic diagram of countersunk head locked anchor bar and pre- ceasma in the embodiment of the present invention.
Specific embodiment
As shown in Figure 1, wall intersects hole excavation supporting construction method behind a kind of first hole of the invention, it to be used for Large Underground Cavern and tunnel intersection are excavated and supporting, during cavern's higher slice excavates, while carry out lower part tunnel 11 excavation and Supporting.In Fig. 1, drawing reference numeral 21 indicates cavern's excavation section, and drawing reference numeral 22 indicates the non-excavation section in cavern.
After tunnel permanent section 11 is excavated to the Design of Side Wall structural plane of cavern, reinforced concrete is carried out to tunnel side and roof arch in time Native spray-up 6 and system anchor bolt 53 are constructed, and are completed system and are sprayed the supporting of anchor linked network, then continue to open into cavern by tunnel section size It digs, forms the tunnel extended segment 12 of depth 5m or so, and 6 supporting of armored concrete spray-up is carried out to extended segment crown and abutment wall.
As shown in Fig. 2, arranging 3 row's locked anchor bars at 11 hole of tunnel permanent section, row array pitch 1m, first row is away from cavern's abutment wall Design structure face 0.5m, wherein side and roof arch uses prestressed anchor 51, length 6m or 9m;Bottom plate uses ordinary mortar anchor pole 52, Length 6m or 4.5m.
As shown in Fig. 2, out of tunnel extended segment 12, to tunnel portal outside implement 3 ring countersunk head locked anchor bars 4, length 4.5m is greater than 30 ° with cavern's abutment wall angle.4 bolthole of countersunk head locked anchor bar includes on the outside of cavern's abutment wall and 2 sections of inside, Abutment wall segmentum laterale (tunnel permanent section country rock) injection Anchor Agent 9 is simultaneously inserted into anchor pole 4, abutment wall medial segment not slip casting not inserted link, attached drawing Label 8 is drilling.
As shown in figure 3, the place with one voice of tunnel permanent section 11 and cavern implements pre- ceasma 3, pre- ceasma 3 is circumferentially disposed, depth 5m, pitch-row 1.5m, presplit blasting form pre- broken face, make rock mass separation inside and outside the neighbouring cavern's abutment wall in intersection, and rear cavern excavation is straight To intersection exposure and the cavern's abutment wall system supporting that follows up.
The construction procedure of the present embodiment is as follows:
The first step, tunnel excavation permanent segment 11 complete system and spray the supporting of anchor linked network.
Second step excavates hole extended segment 12, crown and abutment wall linked network spray shield.
Third step implements locked anchor bar 5 in tunnel.
4th step implements cavern's abutment wall countersunk head locked anchor bar 4.
5th step completes pre- ceasma 3, presplit blasting.
6th step is dug under cavern, until intersection presplitting range is excavated using machinery, system supporting follow-up, until intersecting hole The complete exposure of mouth.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art Those of ordinary skill, in the range of embodiment, variation, addition or the replacement made all should belong to protection scope of the present invention.

Claims (5)

1. wall intersects hole excavation supporting construction method behind a kind of elder generation hole, excavated for large underground hole and tunnel intersection And supporting, it is characterised in that: during cavern's higher slice excavates, while carrying out lower part tunnel permanent section (11) and excavating and prop up Shield, the permanent segment excavate and supporting after the completion of tunnel excavation extended segment (12) and implement gib, then carry out the friendship The construction of countersunk head locked anchor bar (4) and pre- ceasma (3) at prong utilizes presplitting after the completion of countersunk head locked anchor bar (4) construction Hole (3) carries out presplit blasting, makes rock mass separation inside and outside cavern's abutment wall near the intersection;
Cavern's layering is lower to dig to stopping explosion within the scope of tunnel permanent section (11) hole presplitting, and being changed to machinery excavates, system Supporting follow-up, until intersecting the complete exposure in hole.
2. wall intersects hole excavation supporting construction method behind elder generation hole according to claim 1, it is characterised in that: lower part tunnel The hole disposed inboard locked anchor bar of hole permanent segment (11), the locked anchor bar be circular layout it is multiple rows of, using answering in advance at side and roof arch Power anchor pole, bottom plate use ordinary mortar anchor pole.
3. wall intersects hole excavation supporting construction method behind elder generation hole according to claim 1, it is characterised in that: the tunnel Hole extended segment (12) cross dimensions is identical as tunnel permanent section (11), sprays the supporting of anchor linked network and hole in tunnel permanent section (11) system It is excavated after mouth locked anchor bar construction, extended segment (12) crown and abutment wall carry out armored concrete spray-up (6) gib.
4. wall intersects hole excavation supporting construction method behind elder generation hole according to claim 1, it is characterised in that: described heavy Head locked anchor bar (4) refers to that anchor pole does not leak outside, the anchor pole being arranged within the scope of designated depth, from extended segment to tunnel permanent section (11) country rock inclination is made bolthole (8) outside hole, and the bolthole (8) is divided on the outside of the abutment wall of cavern and 2 sections of inside, segmentum laterale injection Anchor Agent is simultaneously inserted into anchor pole, medial segment not slip casting not inserted link.
5. wall intersects hole excavation supporting construction method behind elder generation hole according to claim 1, it is characterised in that: described pre- Ceasma circumferentially disposed ring on the outside of the hole of lower part tunnel permanent section (11) along cavern's abutment wall.
CN201910387118.7A 2019-05-10 2019-05-10 Excavation and support construction method for first-hole and later-wall type crossed hole Active CN110107323B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910387118.7A CN110107323B (en) 2019-05-10 2019-05-10 Excavation and support construction method for first-hole and later-wall type crossed hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910387118.7A CN110107323B (en) 2019-05-10 2019-05-10 Excavation and support construction method for first-hole and later-wall type crossed hole

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CN110107323B CN110107323B (en) 2020-12-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111550248A (en) * 2020-05-20 2020-08-18 长沙矿山研究院有限责任公司 Pre-roof-protecting sublevel open-stoping subsequent filling mining method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111550248A (en) * 2020-05-20 2020-08-18 长沙矿山研究院有限责任公司 Pre-roof-protecting sublevel open-stoping subsequent filling mining method
CN111550248B (en) * 2020-05-20 2021-06-01 长沙矿山研究院有限责任公司 Pre-roof-protecting sublevel open-stoping subsequent filling mining method

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