CN209244590U - Surrounding rock of chamber pays protecting system and cavern's structure in advance - Google Patents
Surrounding rock of chamber pays protecting system and cavern's structure in advance Download PDFInfo
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- CN209244590U CN209244590U CN201822189682.1U CN201822189682U CN209244590U CN 209244590 U CN209244590 U CN 209244590U CN 201822189682 U CN201822189682 U CN 201822189682U CN 209244590 U CN209244590 U CN 209244590U
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Abstract
The utility model discloses the construction methods that a kind of surrounding rock of chamber pays protecting system, cavern's structure and cavern's structure in advance, belong to Cavity Construction technical field, the rear supporting construction and advance support structure to solve the problems, such as existing surrounding rock of chamber use are unable to satisfy the construction supporting demand of the surrounding rock of chamber of high-ground stress, large span and more structural planes.The utility model is initially formed before excavating cavern's cavity pays protecting system in advance accordingly, carrying arch ring is formed by the way that corresponding auxiliary tunnel is arranged and pays protection structure in advance accordingly, effectively reinforced phase the structural strength and bearing capacity of rock mass can be answered in this way, and then ensure safety during carrying out cavern's cavity excavation construction;The construction supporting demand of the surrounding rock of chamber of high-ground stress, large span and more structural planes can effectively be met.
Description
Technical field
The utility model relates to Cavity Construction technical field more particularly to a kind of this surrounding rock of chamber pay in advance protecting system,
The construction method of cavern's structure and cavern's structure.
Background technique
With the development of western hydraulic engineering, hydroelectric project, traffic engineering etc., more and more underground engineerings will be built,
The case where cavern's scale of underground engineering is also increasing, and span usually reaches 30m~40m, even more large span.Meanwhile
Under western special complicated geological and orographic condition, high-ground stress problem usually annoyings the design and excavation supporting of underground engineering
Construction, while because of geological structure complexity, cause rock mass discontinuity more, excavates difficult forming.Large span, high-ground stress and more
In the case where various unfavorable geologic(al) factors such as structural plane rock mass and combinations thereof, brought to the design and construction of underground excavation engineering huge
Big difficulty.
Classify from the construction time of supporting construction, the supporting of underground engineering can be divided into pre support and rear supporting.In hole
The supporting that just construction is completed or part construction is completed before room is excavated is pre support;The supporting constructed again after cavern excavation, after being
Supporting.The design and construction technology of current underground chamber, the overwhelming majority are to carry out pneumatically placed concrete, linked network, anchor pole, anchor again after excavation
The rear supporting measure such as rope, concrete lining;Also have under partial picture by area towards cavern do not excavate region construct anchor pole,
The mode of the measures such as pipe canopy, grouting progress advance support.
However for 30m~40m, the even more large-span underground chamber, high-ground stress of large span and more structural plane rocks
For the country rock of body, only with rear support technology, engineering accident, including casualties, construction delay, investment increasing are frequently resulted in
The problems such as adding, these accidents bring huge economic and social impacts.
For small span cavern, it is carried forward advance support in face and achieves certain technical experience, but for
30m~40m and underground chamber with upper span, need the range of pre support larger, and it is tired to carry out advance support operation in face
It is difficult.And in hole, indoor advance support generally requires the supporting construction such as oblique construction anchor pole, pipe canopy, occupies to a certain extent
The space of supporting construction afterwards, may cause rear supporting construction can not construct.
In general, current rear supporting and advance support are respectively present following disadvantage:
For rear supporting construction, mainly have the disadvantage that:
1) more for wall rock structure face in digging process, while higher situation, excavation crustal stress discharge crustal stress again
After may cause surrounding rock collapse and collapse, influence construction safety.
2) after cavern excavation, surrouding rock stress largely discharges, country rock craze and transfiguration, and load-carrying capacity of surrounding rock is very
Big degree reduces, and the later period, which needs to increase many supporting measures, just can ensure that Rock Slide Stability, cannot give full play to the self-supporting of country rock
Ability causes supporting expense to increase very much.
3) supporting country rock, anchor pole, the prestress anchorage cable of use may generate larger because of Stress relieving of surrounding rocks again after excavating
Deformation, this deformation may cause supporting construction and deform therewith, when deforming excessive, the supporting construction such as anchor pole, anchor cable, lining cutting
It will failure.
4) supporting country rock, this supporting construction scheme account for the straight line duration again after excavating, if the project amount of rear supporting is larger,
Then increase the longer straight line duration, increases engineering construction total construction period.
For through face advance support, mainly have the disadvantage that
1) not excavate Regional Geological Conditions to face leading edge unclear, it is difficult to take targetedly supporting measure.
2) rock mass of to large span, high-ground stress and more structural planes situations such as, the supporting of advance support structure apart from it is short,
Supporting range is small and support rigidity is small, therefore, it is difficult to form enough supporting effects, is not effective to ensure that country rock after excavation
Stabilization.
3) when cavern excavation, blasting vibration may cause the supporting construction constructed in advance and be damaged, especially consolidation grouting, quick-fried
Broken vibration will lead to grouting rock-mass relaxing, reduce Rock Bearing Capacity.
4) in tunnel face pre support, the straight line duration can be occupied, influences engineering aggregate scheduling.
Utility model content
The technical issues of the utility model solves is: the rear supporting construction and advance support structure that existing surrounding rock of chamber uses
It is unable to satisfy the construction supporting demand of the surrounding rock of chamber of high-ground stress, large span and more structural planes;There is provided a kind of achievable pair
The surrounding rock of chamber that the surrounding rock of chamber of high-ground stress, large span and more structural planes carries out pre support pays protecting system in advance.
The technical scheme adopted by the utility model to solve the technical problem is as follows: surrounding rock of chamber pays protecting system in advance, including more
A auxiliary tunnel being set parallel to each other, multiple auxiliary tunnels are spaced apart along " U-shaped ";" the U surrounded by multiple auxiliary tunnels
It is cavern excavation region in shape " region, and the axial direction of each auxiliary tunnel is axial consistent with cavern's cavity design;In each auxiliary
It is respectively arranged in the country rock in hole and pays protection structure in advance, paid protection structure in advance by multiple auxiliary tunnels and accordingly and be collectively formed
Positioned at the carrying arch ring of cavern excavation region exterior.
Further, the protection structure of paying in advance includes consolidation grouting hole, consolidation is formed after slip casting in consolidation grouting hole
Be in the milk body;The consolidation grouting body being arranged in the same auxiliary tunnel is axially spaced layering setting, each layer along the auxiliary tunnel
Multiple consolidation grouting bodies are inside provided with, and are located on the same floor interior consolidation grouting body along radial point of auxiliary tunnel circumferential direction country rock
Cloth.
Further, the protection structure of paying in advance includes anchor pole;The anchor pole being arranged in the same auxiliary tunnel is along the auxiliary
Hole is axially spaced layering setting, is provided with more anchor poles in each layer, and be located on the same floor interior anchor pole along auxiliary tunnel
Circumferential country rock radially distributes.
Further, the protection structure of paying in advance includes anchor cable;The anchor cable being arranged in the same auxiliary tunnel is along the auxiliary
Hole is axially spaced layering setting, is provided at least one anchor cable in each layer, the anchored end of the anchor cable is opened backwards to cavern
It is oppositely arranged to dig region.
Further, being provided with interconnected consolidation grouting body between two neighboring auxiliary tunnel.
Further, being located at the consolidation grouting body in same auxiliary tunnel in same layer includes leaning forward consolidation grouting body with after
Incline consolidation grouting body, and the consolidation grouting body that leans forward is obliquely installed axially forward along auxiliary tunnel, the hypsokinesis consolidation grouting body edge
Auxiliary tunnel is obliquely installed axially backward.
Further, the adjacent two layers consolidation grouting body being located in the same auxiliary tunnel connects or intersects;Positioned at phase
The consolidation grouting body of respective layer connects or intersects in adjacent two auxiliary tunnels.
In addition, the utility model also provided a kind of cavern's structure, cavern's structure is practical new using above-mentioned
Surrounding rock of chamber described in type carries out the overall structure formed after cavern con struction in the case where paying protecting system in advance, in cavern excavation region
Interior formation cavern cavity;Anchoring piece is respectively arranged in the country rock at cavern cavity two sides and top, the anchoring piece is anchor cable
And/or anchor pole.
In addition, the utility model also provides a kind of construction method of above-mentioned cavern's structure described in the utility model, including such as
Lower step:
The first step, before excavating cavern's cavity, according to cavern's cavity design determine parameter, on cavern cavity two sides and top
It is first excavated in the corresponding rock mass in portion and forms multiple auxiliary tunnels;
Second step, the construction for carrying out paying in advance protection structure in each auxiliary tunnel;
Third step is completed in the pre support structure construction in all auxiliary tunnels and after separated in time, then carries out cavern
The excavation construction of cavity;
4th step carries out the anchoring construction to cavern's cavity country rock during excavating cavern's cavity.
Further, in the third step, pre support structure construction in all auxiliary tunnels after the completion of, is at least spaced 48
The excavation construction of cavern's cavity is carried out after hour again.
It is paid in advance accordingly the beneficial effects of the utility model are: the utility model is initially formed before excavating cavern's cavity
Protecting system, while carrying arch ring is formed by auxiliary tunnel and corresponding protection structure of paying in advance, effectively reinforced phase it can answer rock mass in this way
Structural strength and bearing capacity, and then ensure safety during carrying out cavern's cavity excavation construction;It is specific originally practical
Novel photo is respectively provided with greater advantage for traditional rear supporting and advance support:
Relative to traditional rear supporting construction, the utility model is had the advantages that
1) ensure excavation phase construction safety: before cavern's cavity excavates, because passing through consolidating crack in cavern excavation area periphery
Load -carring arch coil structures have been formed, the stress at palisades position and deformation after cavern excavation will be substantially reduced, have increased the construction of excavation phase
Safety.
2) self-bearing ability of surrounding rock of chamber can be given full play to, supporting expense is reduced: cavern periphery rock mass being carried out before excavating
Preparatory reinforcing increases its bearing capacity, and after cavern's cavity excavates, rock mass deformation destroys few, can reduce cavern's cavity palisades
Supporting intensity reduces supporting expense.
3) it saves the straight line duration: country rock periphery being reinforced before excavating, when cavern's cavity excavates, the supporting needed is strong
Degree reduces, and saves cavern's cavity construction period.
For face advance support structure, surrounding rock of chamber described in the utility model, which pays protecting system in advance, to be had such as
Lower advantage:
1) by auxiliary cavern con struction, cavern's cavity geological conditions can be known in advance, convenient for formulating for Geological Defects
Prediction scheme.
2) to the surrounding rock consolidation of cavern periphery, periphery carrying arch ring is formed, increases the range of Load -carring arch, it is ensured that large span
The adjoining rock stability safety of cavern.
3) it in advance in cavern periphery to surrounding rock consolidation, is not influenced by cavern excavation explosion.
4) by reducing the support time during tunnel excavation to the surrounding rock consolidation of cavern periphery, the straight line duration is reduced.
In addition, the auxiliary tunnel in the utility model, can pass through reasonable Arrangement prospecting adit, seepage proof curtain gallery, draining corridor
Road and draining hole etc. are used as auxiliary tunnel;Further less construction investment, reasonable utilize can have engineering structure in this way.
Detailed description of the invention
Fig. 1 is the cross-sectional view that surrounding rock of chamber described in the utility model pays protecting system in advance;
Fig. 2 is the cross-sectional view of cavern's structure described in the utility model;
Fig. 3 bows for cavern's structure described in the utility model to cross-sectional view;
In the figure, it is marked as auxiliary tunnel 1, cavern excavation region 2, consolidation grouting body 3, the consolidation grouting body 31 that leans forward, hypsokinesis are solid
Knot grouting body 32, anchor pole 4, anchor cable 5, carrying arch ring 6, cavern's cavity 7, anchoring piece 8.
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
Surrounding rock of chamber described in the utility model pays protecting system and cavern's structure in advance, for for high-ground stress, large span
And supporting construction designed by the surrounding rock of chamber under the conditions of the multiplexed addresses such as more structural planes and the cavern's structure being consequently formed;
Practical Project term wherein is belonged to for terms such as high-ground stress, large span, more structural planes, those skilled in the art can combine ability
The case where domain practical engineering project and determine;Such as under normal conditions, Large span cavern refers to that its span is not less than 30 meters
Situation, but it is not limited to the size, those skilled in the art can choose whether in conjunction with Practical Project situation using the utility model institute
The surrounding rock of chamber stated pays protecting system and cavern's structure in advance.
As shown in fig. 1, surrounding rock of chamber described in the utility model pays protecting system in advance, is set parallel to each other including multiple
Auxiliary tunnel 1, multiple auxiliary tunnels 1 are spaced apart along " U-shaped ";It being cavern in " U-shaped " region surrounded by multiple auxiliary tunnels 1
Region 2 is excavated, and the axial direction of each auxiliary tunnel 1 is axial consistent with the design of cavern's cavity 7;In the country rock of each auxiliary tunnel 1
It is respectively arranged with and pays protection structure in advance, pay protection structure in advance by multiple auxiliary tunnels 1 and accordingly and be collectively formed positioned at cavern
Excavate the carrying arch ring 6 outside region 2.
Wherein, the structure of " U-shaped " specifically can refer to shape shown in attached drawing 1;And cavern's cavity 7 is referred in cavern
Excavate the main body cavern formed after excavating in region 2.In the utility model, by multiple auxiliary tunnels 1 and in each auxiliary tunnel 1
The protection structure of paying in advance of interior setting forms strengthening supporting work in the two sides side in cavern excavation region 2 and the rock mass at top jointly
With so as to form the carrying arch ring 6 with stronger bearing capacity;The corresponding dotted line of carrying arch ring 6 as shown in Fig. 1 is enclosed
At region.
More specifically, paying protection structure described in the utility model in advance can be used consolidation grouting body 3, anchor pole 4 and anchor cable 5 three
In any one in person or any two kinds or three kinds carry out and support anchoring.The effect for paying protection structure in advance is mainly used for wearing
Enter into corresponding rock mass, and then improves the structural strength of rock mass;On the one hand effect of the high-ground stress to rock mass can be dispersed, it is another
Aspect can effectively improve the connection effect of rock mass between more structural planes;Arch ring 6 is carried eventually by being formed, improves carrying arch ring 6
The whole bearing capacity to external rock mass, it is ensured that the stable structure of rock mass, in order to carry out cavern's cavity inside carrying arch ring 6
7 excavation construction.The case where being as shown in the drawing while being provided with consolidation grouting body 3, anchor pole 4 and anchor cable 5.
Wherein, when paying protection structure in advance includes consolidation grouting body 3, need to be drilled with corresponding consolidation grouting hole, and in hole
Consolidation grouting body 3 is formed after slip casting;Axially spaced-apart of the consolidation grouting body 3 being arranged in the same auxiliary tunnel 1 along the auxiliary tunnel 1
Ground layering is arranged, and is provided with multiple consolidation grouting bodies 3 in each layer, and is located on the same floor interior consolidation grouting body 3 along auxiliary
The circumferential country rock in hole 1 radially distributes.Since consolidation grouting body 3 is hardly limited by the hole diameter size of auxiliary tunnel 1, reference
Shown in attached drawing, the consolidation grouting body 3 in the utility model can be set to the case where being greater than 1 hole diameter of auxiliary tunnel.Such as attached drawing 1
Shown in, in each auxiliary tunnel 1, every layer of consolidation grouting body 3 includes 6-8, and each consolidation grouting body 3 is circumferentially in
Substantially uniform radial distribution;In addition, the spacing between adjacent layer consolidation grouting body 3 can be according to reality referring to shown in attached drawing 3
It is 1-2m that border situation, which carries out the spacing between reasonable layout setting, such as settable adjacent layer,.
More specifically, preferably it is arranged between two neighboring auxiliary tunnel 1 and is provided with interconnected consolidation grouting body 3.This
Sample can further improve the connection effect between two neighboring auxiliary tunnel 1, improve adding for the rock mass between two neighboring auxiliary tunnel 1
Gu effect.
More specifically, it includes the consolidation that leans forward that preferably setting, which is located at the consolidation grouting body 3 in same auxiliary tunnel 1 in same layer,
Be in the milk body 31 and hypsokinesis consolidation grouting body 32, and the consolidation grouting body 31 that leans forward is obliquely installed axially forward along auxiliary tunnel 1, described
Hypsokinesis consolidation grouting body 32 is obliquely installed axially backward along auxiliary tunnel 1.Wherein lean forward consolidation grouting body 31 and hypsokinesis consolidation grouting
Body 32 can be generally symmetric relative to the normal of corresponding rock wall surface;Adjacent two will be located in the same auxiliary tunnel 1 simultaneously
Corresponding consolidation grouting body 3 connects or arranged in a crossed manner in layer.Referring for example to structure shown in attached drawing 3, in adjacent two layers
Corresponding consolidation grouting body 3 contacts with each other, i.e., the hypsokinesis consolidation grouting body 32 in upper one layer of consolidation grouting body 3 with it is adjacent next
It is substantially in that the contact with each other position of connection is closed that the consolidation grouting body 31 that leans forward in layer consolidation grouting body 3, which gos deep into the intracorporal end of rock,
System.Similarly, further the consolidation grouting body 3 for being located at respective layer in two neighboring auxiliary tunnel 1 can also be connected in the utility model
Or it is arranged in a crossed manner.Certainly, during for practice of construction, the phase of two required consolidation grouting bodies 3 in the utility model
It connects, as long as the end for meeting the two is close to each other;Such as think that the spacing of the two end is interpreted as this less than 0.5 or less
Connect described in utility model, is not required for completely attaching to connection;And the intersection of consolidation grouting body 3 each for two, then it is not
It is required that the two connection completely intersects, but in the projection of the axial direction of the design of cavern's cavity 7 in rough cross-distribution.
By the consolidation grouting body 3 of above-mentioned setting, space net structure can be formed, and then improves the anchoring effect to corresponding rock mass, into
And effectively improve the bearing capacity of finally formed carrying arch ring 6.
In addition, when it is described to pay protection structure in advance include anchor pole 4 when;The anchor pole 4 that can be arranged in the same auxiliary tunnel 1 is auxiliary along this
That helps hole 1 is axially spaced layering setting, is provided with more anchor poles 4 in each layer, and be located on the same floor interior anchor pole 4 along auxiliary
The circumferential country rock in hole 1 is helped to radially distribute.Since the construction of anchor pole 4 will receive the limitation of the hole diameter of auxiliary tunnel 1, anchor pole 4
Length it is unsuitable too long;Referring in particular to shown in attached drawing, length in attached drawing relative to consolidation grouting body 3 it is shorter be anchor pole
4.Due to the relatively section of anchor pole 4, and it is more conducive to construct for the construction of consolidation grouting body 3 and anchor cable 5, therefore anchor pole 4
It can be oppositely arranged more intensive, on the one hand can reinforce the structural strength that entire surrounding rock of chamber pays protecting system in advance, it on the other hand can also
The supporting effect that comparatively dense is played to the surface layer country rock of auxiliary tunnel 1 prevents surface layer country rock from falling off.
In addition, can be further provided in the utility model to further enhance the anchorage effect with the rock mass of deeper
Anchor cable 5;The anchor cable 5 being arranged in the same auxiliary tunnel 1 is axially spaced layering setting along the auxiliary tunnel 1, sets in each layer
It is equipped at least one anchor cable 5, the anchored end of the anchor cable 5 is oppositely arranged backwards to cavern excavation region 2.As shown in Fig. 1, anchor
Rope 5 may be configured as relative to the longer structure of consolidation grouting body 3, to be anchored to deeper rock mass.Without loss of generality, anchor cable
5 quantity that are usually arranged are relatively fewer, therefore anchor cable 5 is usually and 3 combination settings of anchor pole 4 or consolidation grouting body;Certainly reason
It can also be separately provided by upper anchor cable 5.As it is shown in the figures, when setting while anchor cable 5, anchor pole 4 and consolidation grouting body 3 is arranged
When;Anchor cable 5 anchors in deeper rock mass after may pass through the carrying arch ring 6 being generally corresponding to by the periphery of consolidation grouting body 3,
The stability for the carrying arch ring 6 being generally corresponding to by the periphery of consolidation grouting body 3 can be further increased on the whole in this way.
In addition, as shown in Fig. 2, the utility model after the completion of above-mentioned surrounding rock of chamber pre support system construction, then
The excavation construction of cavern's cavity 7 is carried out in cavern excavation region 2 and forms cavern's cavity 7;And then it ultimately forms by cavern's cavity 7
Protecting system is paid in advance with surrounding rock of chamber described in the utility model collectively constitutes cavern's structure.
More specifically, anchoring piece 8, the anchoring can be respectively arranged with again in the country rock at 7 two sides of cavern's cavity and top
Part is anchor cable and/or anchor pole, wherein it is preferred that using anchor pole.It is further strengthened by anchoring piece 8 to the corresponding palisades table of cavern's cavity 7
The anchorage effect of layer improves 7 surface layer rock stability of cavern's cavity.In this way, forming the Load -carring arch of periphery by paying protecting system in advance
Circle 6 undertakes the loads such as crustal stress, the underground water of periphery by the carrying arch ring 6 of periphery;And after cavern's cavity 7 excavates, pass through anchoring
Part 8 forms the superficial layer carrier ring of the palisades of cavern's cavity 7, which is primarily subjected to palisades superficial rock mass from heavy burden
It carries, therefore the stability of cavern's cavity 7 can be improved.
The construction method of cavern's structure described in the utility model specifically comprises the following steps:
The first step, before excavating cavern's cavity 7, determining parameter, 7 two sides of cavity in cavern are designed according to cavern's cavity 7
And it is first excavated in the corresponding rock mass in top and forms multiple auxiliary tunnels 1;
Second step, the construction for pay in advance in each auxiliary tunnel 1 protection structure;
Third step is completed in the pre support structure construction in all auxiliary tunnels 1 and after separated in time, then carries out cavern
The excavation construction of cavity 7;
4th step carries out the anchoring construction to 7 country rock of cavern's cavity during excavating cavern's cavity 7.
Wherein, cavern's cavity 7 is designed in the first step and determines that parameter is in practice of construction engineering according to corresponding design
It is required that determining, including parameters such as the axial direction of cavern's cavity 7, span and height;After above-mentioned parameter determines
The auxiliary tunnel 1 of 7 periphery of cavity reasonable Arrangement respective numbers as needed in cavern, or make full use of needed for work progress
Prospecting adit, seepage proof curtain gallery, collector drain and draining hole etc. are used as auxiliary tunnel 1.
In addition, according to the difference for paying protection structure in advance, and construct accordingly in second step.Such as when including
When having consolidation grouting body 3, then construction carries out consolidation grouting again to drill in corresponding auxiliary tunnel 1 first with shape
At consolidation grouting body 3;When including two kinds or more when paying protection structure in advance, can successively be constructed according to feelings.
The utility model in the construction process, due to carry out cavern's cavity 7 excavation construction before carried out surrounding rock of chamber
Pay the construction of protecting system in advance, and separated in time is to ensure to pay in advance the stabilization of protection structure;And then have by paying protection structure in advance
Carrying arch ring 6 is formd to effect, excavation construction is carried out in carrying 6 area encompassed of arch ring again later, be can ensure that out with this
The stability of country rock during digging.Cavern's structure described in the utility model by pay in advance protecting system formation carrying arch ring 6 with
And the superficial layer carrier ring formed by the anchoring piece 8 in cavern's cavity 7, the double-deck bearing structure can be formed, hole will be substantially reduced
The rock mass deformation situation of chamber body 7, it is ensured that the adjoining rock stability after cavern excavation construction time and construction.
Surrounding rock of chamber described in the utility model pays the construction method, outstanding of protecting system, cavern's structure and cavern's structure in advance
It is suitable for the supporting demands of the surrounding rock of chamber of high-ground stress, large span and more structural planes, it is ensured that in such multiplexed address
Under the conditions of cavern's safe construction and structural stability.
Claims (8)
1. surrounding rock of chamber pays protecting system in advance, it is characterised in that: including multiple auxiliary tunnels (1) being set parallel to each other, multiple auxiliary
Hole (1) is spaced apart along " U-shaped ";It being cavern excavation region (2) in " U-shaped " region surrounded by multiple auxiliary tunnels (1),
And the axial direction of each auxiliary tunnel (1) and cavern's cavity (7) are designed axial consistent;In the country rock of each auxiliary tunnel (1) respectively
It is provided with and pays protection structure in advance, by multiple auxiliary tunnels (1) and pay protection structure in advance accordingly and be collectively formed and opened positioned at cavern
Dig region (2) external carrying arch ring (6).
2. surrounding rock of chamber as described in claim 1 pays protecting system in advance, it is characterised in that: the protection structure of paying in advance includes that consolidation fills
Hole is starched, forms consolidation grouting body (3) after slip casting in consolidation grouting hole;The consolidation grouting being arranged in the same auxiliary tunnel (1)
Body (3) is axially spaced layering setting along the auxiliary tunnel (1), is provided with multiple consolidation grouting bodies (3), and position in each layer
It radially distributes in the consolidation grouting body (3) in same layer along the circumferential country rock of auxiliary tunnel (1).
3. surrounding rock of chamber as described in claim 1 pays protecting system in advance, it is characterised in that: the protection structure of paying in advance includes anchor pole
(4);The anchor pole (4) being arranged in the same auxiliary tunnel (1) is axially spaced layering setting, each layer along the auxiliary tunnel (1)
More anchor poles (4) are inside provided with, and is located on the same floor interior anchor pole (4) and radially distributes along the circumferential country rock of auxiliary tunnel (1).
4. surrounding rock of chamber as claimed in claim 2 or claim 3 pays protecting system in advance, it is characterised in that: the protection structure of paying in advance includes anchor
Rope (5);The anchor cable (5) being arranged in the same auxiliary tunnel (1) is arranged along the layering that is axially spaced of the auxiliary tunnel (1), each
It is provided at least one anchor cable (5) in layer, the anchored end of the anchor cable (5) is oppositely arranged backwards to cavern excavation region (2).
5. surrounding rock of chamber as claimed in claim 2 pays protecting system in advance, it is characterised in that: set between two neighboring auxiliary tunnel (1)
It is equipped with interconnected consolidation grouting body (3).
6. surrounding rock of chamber as claimed in claim 2 pays protecting system in advance, it is characterised in that: be located at same in same auxiliary tunnel (1)
Consolidation grouting body (3) in layer includes lean forward consolidation grouting body (31) and hypsokinesis consolidation grouting body (32), and the consolidation that leans forward fills
Slurry (31) is obliquely installed axially forward along auxiliary tunnel (1), the hypsokinesis consolidation grouting body (32) along auxiliary tunnel (1) axially backward
It is obliquely installed.
7. surrounding rock of chamber as claimed in claim 6 pays protecting system in advance, it is characterised in that: be located in the same auxiliary tunnel (1)
Adjacent two layers consolidation grouting body (3) connects or intersects;Positioned at the consolidation grouting body of two neighboring auxiliary tunnel (1) interior respective layer
(3) connect or intersect.
8. cavern's structure pays protecting system in advance including surrounding rock of chamber described in any one of the claims 1 to 7;Its feature
It is: forms cavern's cavity (7) in cavern excavation region (2);It is set respectively in the country rock at cavern's cavity (7) two sides and top
It is equipped with anchoring piece (8), the anchoring piece is anchor cable and/or anchor pole.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109404019A (en) * | 2018-12-25 | 2019-03-01 | 中国电建集团成都勘测设计研究院有限公司 | Surrounding rock of chamber pays protecting system and cavern's structure in advance |
CN114320340A (en) * | 2021-12-28 | 2022-04-12 | 中铁第六勘察设计院集团有限公司 | Large-span pillar-free underground tunnel structure and method based on advanced pilot tunnel and counter-pulling anchor cable |
-
2018
- 2018-12-25 CN CN201822189682.1U patent/CN209244590U/en active Active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109404019A (en) * | 2018-12-25 | 2019-03-01 | 中国电建集团成都勘测设计研究院有限公司 | Surrounding rock of chamber pays protecting system and cavern's structure in advance |
CN109404019B (en) * | 2018-12-25 | 2024-02-27 | 中国电建集团成都勘测设计研究院有限公司 | Cave surrounding rock pre-supporting system and cave structure |
CN114320340A (en) * | 2021-12-28 | 2022-04-12 | 中铁第六勘察设计院集团有限公司 | Large-span pillar-free underground tunnel structure and method based on advanced pilot tunnel and counter-pulling anchor cable |
CN114320340B (en) * | 2021-12-28 | 2023-09-12 | 中铁第六勘察设计院集团有限公司 | Large-span non-column underground tunnel structure and method based on advanced pilot tunnel and opposite-pulling anchor cable |
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