CN109751063A - A kind of large section tunnel supporting construction and its construction method - Google Patents
A kind of large section tunnel supporting construction and its construction method Download PDFInfo
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- CN109751063A CN109751063A CN201910140911.7A CN201910140911A CN109751063A CN 109751063 A CN109751063 A CN 109751063A CN 201910140911 A CN201910140911 A CN 201910140911A CN 109751063 A CN109751063 A CN 109751063A
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- pilot tunnel
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- embarrassing situation
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Abstract
The present invention provides a kind of large section tunnel supporting construction and its construction method, is related to tunnel construction technical field.The large section tunnel supporting construction includes left pilot tunnel, middle drift and right pilot tunnel, left pilot tunnel, width direction of the middle drift with right pilot tunnel along large section is sequentially arranged, left pilot tunnel includes that left pilot tunnel top bar and left pilot tunnel are got out of a predicament or an embarrassing situation, left pilot tunnel top bar is located at the top that left pilot tunnel is got out of a predicament or an embarrassing situation, middle drift includes middle drift top bar, step and middle drift are got out of a predicament or an embarrassing situation in middle drift, middle drift top bar, step and the middle drift short transverse along middle drift of getting out of a predicament or an embarrassing situation are sequentially arranged in the middle drift, interim perpendicular support is provided in middle drift top bar, right pilot tunnel includes that right pilot tunnel top bar and right pilot tunnel are got out of a predicament or an embarrassing situation, right pilot tunnel top bar is located at the top that right pilot tunnel is got out of a predicament or an embarrassing situation.Large section tunnel supporting construction provided by the invention, construction are flexibly, applied widely；Working security can be improved, reduce engineering safety risk.
Description
Technical field
The present embodiments relate to tunnel construction technical field more particularly to a kind of large section tunnel supporting construction
And its construction method.
Background technique
Currently, traffic jam issue is always one in the people's lives of city big worried, and interchange can be to avoid
The time restriction of traffic lights, while guaranteeing that the wagon flow of all directions is unblocked, it does not interfere with each other, has been inherently eliminated level-crossing
Brought puzzlement embodies very big superiority solving Urban Traffic Jam Based level.But interchange occupied area
Greatly, and city be an inch of land is an inch of gold place, therefore various forms of underground intercommunications are come into being.
The tunnel cross-section size of underground intercommunication main line and ring road fork section is often very big, according to domestic similar engineering case,
Span is excavated up to 25m~30m, after tunnel excavation, arch country rock settles under gravity pressure, causes side wall position country rock
It is pressurized, with the increase of excavated section, the deformation of country rock and relaxation effect are obvious, are not easy arching, easily collapse, and country rock carries energy certainly
The more difficult performance of power, constructing tunnel difficulty also greatly increases, risk is high, once accident occurs, it will seriously affect engineering quality,
Safety, progress, so cause huge economic losses.
Summary of the invention
(1) technical problems to be solved
An object of the present invention is to provide a kind of large section tunnel supporting construction, to solve existing support system
The problem that safety is low, engineering risk is high.
The second object of the present invention is to provide a kind of construction method for building above-mentioned large section tunnel supporting construction, with solution
Support rigidity existing for certainly existing construction method is low, support engineering safety difference problem.
(2) technical solution
One of in order to solve the above-mentioned technical problem, the present invention provides a kind of large section tunnel supporting construction, including a left side is led
Hole, middle drift and right pilot tunnel, the width direction of the left pilot tunnel, the middle drift with the right pilot tunnel along large section are sequentially set
It sets, the left pilot tunnel includes that left pilot tunnel top bar and left pilot tunnel are got out of a predicament or an embarrassing situation, and the left pilot tunnel top bar is located under the left pilot tunnel
The top of step, the middle drift includes middle drift top bar, step and middle drift are got out of a predicament or an embarrassing situation in middle drift, on the middle drift
Step and the middle drift short transverse along the middle drift of getting out of a predicament or an embarrassing situation are sequentially arranged in step, the middle drift, described
Interim perpendicular support is provided in middle drift top bar, the right pilot tunnel includes that right pilot tunnel top bar and right pilot tunnel are got out of a predicament or an embarrassing situation, the right side
Pilot tunnel top bar is located at the top that the right pilot tunnel is got out of a predicament or an embarrassing situation.
In order to solve the above-mentioned technical problem two, the present invention, which provides, a kind of builds above-mentioned large section tunnel supporting construction
Construction method includes the following steps:
Step S1, excavates left pilot tunnel top bar, and excavation cross section is 35m2~45m2, excavation drilling depth is 0.5m~1.0m, is opened
Left pilot tunnel top bar supporting should be applied after the completion of digging immediately；
Step S2 excavates left pilot tunnel and gets out of a predicament or an embarrassing situation after left pilot tunnel top bar excavates 3m~5m, and excavation cross section is 35m2~
45m2, excavation drilling depth is 0.5m~1.0m, should apply left pilot tunnel after the completion of excavation immediately and get out of a predicament or an embarrassing situation supporting；
Step S3 applies right pilot tunnel using identical method after left pilot drive 10m~18m；
Step S4, after right pilot drive 10m~18m, middle drift top bar excavated section point or so two parts are excavated, often
Secondary excavation area 40m2~50m2, excavation drilling depth be 0.5m~1.0m, excavate after the completion of apply immediately the supporting of middle drift top bar and
Interim perpendicular support；
Step S5 excavates step in middle drift, excavation area 55m after middle drift top bar excavates 3m~5m2~65m2,
Interim perpendicular support is removed, applies step supporting in middle drift immediately after excavation, step supporting connects the left side and leads in the middle drift
Hole top bar supporting and the right pilot tunnel top bar supporting form space force transfer system；
Step S6 excavates middle drift and gets out of a predicament or an embarrassing situation after bench excavation 3m~5m in middle drift, excavation area 70m2~90m2,
It gets out of a predicament or an embarrassing situation supporting as excavation applies middle drift.
(3) beneficial effect
Large section tunnel supporting construction provided by the invention, along the left pilot tunnel of width direction point, middle drift and the right side of section
Three base tunnels of pilot tunnel, along the short transverse of section, left pilot tunnel and right pilot tunnel include two steps, and middle drift includes three platforms
Rank is constructed respectively so that large section is divided into seven light sections, applied widely convenient for flexibly construction；Exist simultaneously
It is provided with interim perpendicular support in the digging process of middle drift, can effectively improve the safety of middle drift construction, reduce engineering safety
Risk；Large section tunnel support construction method provided by the invention, working security is high, applied widely.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of large section tunnel of embodiment of the present invention supporting construction；
Fig. 2 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S1
Figure；
Fig. 3 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S2
Figure；
Fig. 4 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S3
Figure；
Fig. 5 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S4
Figure；
Fig. 6 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S5
Figure；
Fig. 7 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S6
Figure；
Fig. 8 is the structure in large section of embodiment of the present invention bore tunnel support construction method after implementation steps S7
Figure.
In figure: 10, left pilot tunnel；11, left pilot tunnel top bar；111, left pilot tunnel top bar first layer permanently just props up；112, left
The pilot tunnel top bar second layer permanently just props up；113, left pilot tunnel advance support；114, left pilot tunnel top bar is temporarily just propped up；115, a left side is led
The interim inverted arch in hole；12, left pilot tunnel is got out of a predicament or an embarrassing situation；121, left pilot tunnel is got out of a predicament or an embarrassing situation, and first layer is permanently first to be propped up；122, left pilot tunnel gets out of a predicament or an embarrassing situation
Two layers of permanent just branch；123, left pilot tunnel is got out of a predicament or an embarrassing situation and is temporarily just propped up；20, middle drift；21, middle drift top bar；211, on middle drift
Step first layer permanently just props up；212, the middle drift top bar second layer permanently just props up；213, middle drift advance support；22, it is led in
Step in hole；221, the interim inverted arch of middle drift；23, middle drift is got out of a predicament or an embarrassing situation；231, middle drift is got out of a predicament or an embarrassing situation, and first layer is permanently first to be propped up；
232, middle drift is got out of a predicament or an embarrassing situation, and the second layer is permanently first to be propped up；24, interim perpendicular support；30, right pilot tunnel；31, right pilot tunnel top bar；311, the right side is led
Hole top bar first layer permanently just props up；312, the right pilot tunnel top bar second layer permanently just props up；313, right pilot tunnel advance support；314,
Right pilot tunnel top bar is temporarily just propped up；315, the interim inverted arch of right pilot tunnel；32, right pilot tunnel is got out of a predicament or an embarrassing situation；321, right pilot tunnel gets out of a predicament or an embarrassing situation first
The permanent just branch of layer；322, right pilot tunnel is got out of a predicament or an embarrassing situation, and the second layer is permanently first to be propped up；323, right pilot tunnel is got out of a predicament or an embarrassing situation and is temporarily just propped up.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Following instance
For illustrating the present invention, but it is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Large section tunnel supporting construction provided in an embodiment of the present invention, as shown in Figure 1, including left pilot tunnel 10, middle drift
20 and right pilot tunnel 30, left pilot tunnel 10, middle drift 20 be sequentially arranged with right pilot tunnel 30 along the width direction of section, left pilot tunnel 10 includes
Left pilot tunnel top bar 11 and left pilot tunnel positioned at 11 lower section of left pilot tunnel top bar get out of a predicament or an embarrassing situation 12, so that left pilot tunnel 10 is divided into up and down
Two steps.Middle drift 20 includes middle drift top bar 21, step 22 and middle drift get out of a predicament or an embarrassing situation 23 in middle drift, and middle drift is appeared on the stage
Step 22 and middle drift are got out of a predicament or an embarrassing situation in rank 21, middle drift 23 is sequentially arranged from top to bottom along the short transverse of middle drift 20, will in
Pilot tunnel 20 is divided into three steps, and interim perpendicular support 24 is provided in middle drift top bar 21；Right pilot tunnel 30 includes that right pilot tunnel is appeared on the stage
Rank 31 and right pilot tunnel positioned at 31 lower section of right pilot tunnel top bar get out of a predicament or an embarrassing situation 32, and right pilot tunnel 30 is divided into two steps up and down.
In work progress, just start the excavation of right pilot tunnel 30 after left pilot tunnel 10 excavates 10m~18m, i.e., right pilot tunnel 30 compares
Left pilot tunnel 10 excavates lag 10m~18m；Start the excavation of middle drift 20 again after right pilot tunnel 30 excavates 10m~18m, i.e., in lead
Lag 10m~18m is excavated than right pilot tunnel 30 in hole 20.Specifically, opening for right pilot tunnel 30 can be carried out after left pilot tunnel 10 excavates 15m
It digs, right pilot tunnel 30 excavates middle drift 20 after excavating 15m again.Left pilot tunnel top bar 11 than left pilot tunnel get out of a predicament or an embarrassing situation 12 excavations it is 3m advanced~
5m gets out of a predicament or an embarrassing situation 12 when left pilot tunnel top bar 11 excavates the rear 3m, 4m or 5m and excavates left pilot tunnel；Middle drift top bar 21 excavates 3m
Step 22 in middle drift is excavated after~5m, step 22, which excavates, in middle drift excavates middle drift after 3m~5m again and get out of a predicament or an embarrassing situation 23；It leads on the right side
Hole top bar 31, which is excavated, to be excavated right pilot tunnel after 3m~5m again and gets out of a predicament or an embarrassing situation 32；Interim perpendicular support 24 is torn open before step 22 excavates in middle drift
It removes.
Large section tunnel supporting construction in the embodiment of the present invention, along section width direction point left pilot tunnel 10, in lead
Hole 20 and 30 3 base tunnels of right pilot tunnel, along the short transverse of section, left pilot tunnel 10 includes two steps with right pilot tunnel 30, in lead
Hole 20 includes three steps, is constructed respectively so that large section is divided into seven light sections, convenient for flexibly construction, is applicable in
Range is wide；Interim perpendicular support 24 is provided in the digging process of middle drift 20 simultaneously, can effectively improve the construction of middle drift 20
Safety reduces engineering safety risk.
Specifically, left pilot tunnel top bar 11 includes left pilot tunnel top bar first layer permanently just branch 111, left pilot tunnel top bar the
Two layers of permanent just branch 112, left pilot tunnel advance support 113, left pilot tunnel top bar temporarily just prop up 114 and the interim inverted arch 115 of left pilot tunnel.
Permanently just branch 111 is layed in the outside that the left pilot tunnel top bar second layer permanently just props up 112, left pilot tunnel to left pilot tunnel top bar first layer
Permanently just permanently just both branch 112 are the outer male structure of arcuation to top bar first layer for branch 111 and the left pilot tunnel top bar second layer, left
Pilot tunnel advance support 113 is located at left pilot tunnel top bar first layer, and permanently just the outside of branch 111, left pilot tunnel top bar first layer are permanent
Just temporarily just branch 114 sequentially joins end to end to form one approximate three with the interim inverted arch 115 of left pilot tunnel for branch 111, left pilot tunnel top bar
The shape at angle.It should be noted that inside refers to that outside is referred to away from left pilot tunnel along towards the side inside left pilot tunnel 10
Side inside 10.To left pilot tunnel top bar first layer, permanently just branch 111, left pilot tunnel top bar temporarily just prop up 114 and left pilot tunnel
Interim inverted arch 115 starts to be laid with left pilot tunnel top bar in permanently first 111 insides of propping up of left pilot tunnel top bar first layer after the completion of applying
The second layer permanently just props up 112.Wherein, temporarily just branch 114 is domed for left pilot tunnel top bar, is recessed to the direction of middle drift 20.
Specifically, it 12 includes that left pilot tunnel gets out of a predicament or an embarrassing situation that permanently just branch 121, left pilot tunnel get out of a predicament or an embarrassing situation the to first layer that left pilot tunnel, which is got out of a predicament or an embarrassing situation,
Two layers of permanent just branch 122 and left pilot tunnel are got out of a predicament or an embarrassing situation interim just branch 123, and left pilot tunnel is got out of a predicament or an embarrassing situation, and permanently just branch 122 is located at a left side to the second layer
Pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch 121 inside, wherein left pilot tunnel is got out of a predicament or an embarrassing situation the second layer permanently just branch 122 with left pilot tunnel on
Permanently just branch 112 is linked to be entirety to the step second layer, and left pilot tunnel is got out of a predicament or an embarrassing situation, and first layer is permanently first to prop up 121 and left pilot tunnel top bar first
The permanent just branch 111 of layer is linked to be entirety, left pilot tunnel get out of a predicament or an embarrassing situation interim just branch 123, left pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch 121 with
The left interim inverted arch 115 of pilot tunnel forms quadrate support structure, wherein left pilot tunnel is got out of a predicament or an embarrassing situation, and the second layer is permanently first to prop up 122 in left pilot tunnel
Get out of a predicament or an embarrassing situation interim just branch 123 and left pilot tunnel gets out of a predicament or an embarrassing situation that permanently just branch 121 is laid on left pilot tunnel after the completion of applying and gets out of a predicament or an embarrassing situation first layer
First layer permanently just props up 121 inside；Left pilot tunnel is got out of a predicament or an embarrassing situation, and permanently just branch 121 and the left pilot tunnel second layer of getting out of a predicament or an embarrassing situation are permanent for first layer
Just 122 structures of branch are identical, in the L-type of smooth transition.
Wherein, the interim inverted arch 115 of left pilot tunnel halves left pilot tunnel 10 along short transverse, i.e., left pilot tunnel top bar 11 and a left side
Pilot tunnel get out of a predicament or an embarrassing situation 12 height it is equal.
Specifically, the framework of right pilot tunnel 30 is identical as the framework of left pilot tunnel 10, and the area of section of the two is consistent, respectively accounts for super large
The 1/4 of profile cross-section area；Middle drift 20 is located at middle part, and area of section accounts for the 1/2 of large section area of section.Certainly, left
The area of section of pilot tunnel 10 and right pilot tunnel 20 can also respectively account for the 0.2 or 0.3 of super large end face area of section, as long as guaranteeing middle drift
20 area of section is maximum in three base tunnels.Specifically, right pilot tunnel top bar 31 includes right pilot tunnel top bar first
Permanently just branch 312, right pilot tunnel advance support 313, right pilot tunnel top bar are faced for layer permanent just branch 311, the right pilot tunnel top bar second layer
Shi Chuzhi 314 and the interim inverted arch 315 of right pilot tunnel.Permanently just branch 311 is located at right pilot tunnel top bar the to right pilot tunnel top bar first layer
The outside of two layers of permanent just branch 312, right pilot tunnel advance support 313 be located at right pilot tunnel top bar first layer permanently just branch 311 outside
Side, permanently just temporarily just branch 314 is suitable with the interim inverted arch 315 of right pilot tunnel for branch 311, right pilot tunnel top bar for right pilot tunnel top bar first layer
It is secondary to join end to end to form the shape of an approximate triangle.311, right pilot tunnel top bar are permanently just propped up to right pilot tunnel top bar first layer
Interim first branch 314 starts after the completion of applying with the interim inverted arch 315 of right pilot tunnel in right pilot tunnel top bar first layer permanently first branch 311
Side is laid with the right pilot tunnel top bar second layer and permanently just props up 312.Wherein, temporarily just branch 314 is domed for right pilot tunnel top bar, in
The direction of pilot tunnel 20 is recessed.Right pilot tunnel top bar 31 and center line symmetrical setting of the left pilot tunnel top bar 11 about large section.
Specifically, it 32 includes that right pilot tunnel gets out of a predicament or an embarrassing situation that permanently just branch 321, right pilot tunnel get out of a predicament or an embarrassing situation the to first layer that right pilot tunnel, which is got out of a predicament or an embarrassing situation,
Two layers of permanent just branch 322 and right pilot tunnel are got out of a predicament or an embarrassing situation interim just branch 323, and right pilot tunnel is got out of a predicament or an embarrassing situation, and permanently just branch 322 is located at the right side to the second layer
Pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch 321 inside, wherein right pilot tunnel is got out of a predicament or an embarrassing situation the second layer permanently just branch 322 with right pilot tunnel on
Permanently just branch 312 is linked to be entirety to the step second layer, and right pilot tunnel is got out of a predicament or an embarrassing situation, and first layer is permanently first to prop up 321 and right pilot tunnel top bar first
The permanent just branch 311 of layer is linked to be entirety, right pilot tunnel get out of a predicament or an embarrassing situation interim just branch 323, right pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch 321 with
The right interim inverted arch 315 of pilot tunnel joins end to end to form quadrate support structure, and right pilot tunnel is got out of a predicament or an embarrassing situation, and the second layer permanently just lead on the right side by branch 322
Get out of a predicament or an embarrassing situation interim just branch 323 and right pilot tunnel of hole gets out of a predicament or an embarrassing situation that permanently just branch 321 is laid on right pilot tunnel and leaves office first layer after the completion of applying
Rank first layer permanently just props up 321 inside.
Wherein, the interim inverted arch 315 of right pilot tunnel is in sustained height, the right interim inverted arch of pilot tunnel with the interim inverted arch 115 of left pilot tunnel
315 halve right pilot tunnel 30 along short transverse, i.e., right pilot tunnel top bar 31 and right pilot tunnel get out of a predicament or an embarrassing situation 32 height it is equal.
Specifically, middle drift top bar 21 includes middle drift top bar first layer permanently just branch 211, middle drift top bar the
Two layers of permanent just branch 212 and middle drift advance support 213, middle drift advance support 213 are located at middle drift top bar first layer forever
The outside of first branch 211 long, permanently just branch 212 is located at middle drift top bar first layer permanently first branch to the middle drift top bar second layer
211 inside, interim perpendicular support 24 extend along the short transverse of middle drift top bar 21, and step 22 excavates preceding dismounting in middle drift
Interim perpendicular support 24.Step 22 includes the interim inverted arch 221 of middle drift, interim 221 one end of inverted arch of middle drift and left pilot tunnel in middle drift
Interim inverted arch 115 is connected, and the other end is connected with the interim inverted arch 315 of right pilot tunnel.
It after step 22 excavates 3m~5m in middle drift, excavates middle drift and gets out of a predicament or an embarrassing situation 23, middle drift, which is got out of a predicament or an embarrassing situation, 23 includes
Branch 231 and middle drift at the beginning of middle drift gets out of a predicament or an embarrassing situation first layer permanently are got out of a predicament or an embarrassing situation, and the second layer is permanently first to prop up 232.Middle drift gets out of a predicament or an embarrassing situation first
Permanent just 231 one end of branch of layer are got out of a predicament or an embarrassing situation with left pilot tunnel, and permanently just branch 121 is connected first layer, and the other end and right pilot tunnel get out of a predicament or an embarrassing situation first
The permanent just branch 321 of layer is connected.Middle drift get out of a predicament or an embarrassing situation the second layer permanently just branch 232 be located at middle drift get out of a predicament or an embarrassing situation first layer permanently just branch
231 inside, one end and left pilot tunnel are got out of a predicament or an embarrassing situation, and permanently just branch 122 is connected the second layer, and the other end and right pilot tunnel get out of a predicament or an embarrassing situation second
The permanent just branch 322 of layer is connected.As a result, left pilot tunnel top bar first layer permanently just branch 111, left pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just
Branch 121, middle drift get out of a predicament or an embarrassing situation first layer permanently just branch 231, right pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch 321, right pilot tunnel appears on the stage
Permanently just permanently just 211 head and the tail of branch are sequentially connected to form the of large section rank first layer for branch 311, middle drift top bar first layer
One layer of permanent support structure；The left pilot tunnel top bar second layer permanently just branch 112, left pilot tunnel get out of a predicament or an embarrassing situation the second layer permanently just branch 122,
Branch 232, right pilot tunnel at the beginning of middle drift gets out of a predicament or an embarrassing situation the second layer permanently are got out of a predicament or an embarrassing situation, and the second layer is permanently first to prop up 322, right pilot tunnel top bar second
Permanently just 212 head and the tail of branch are sequentially connected to form the second layer of large section forever for layer permanent just branch 312, the middle drift top bar second layer
The large section that is designed as of long supporting construction, double-layer structure provides strong support, and support rigidity is big, it is ensured that tears support operating condition tunnel open
Safety reduces engineering risk.
The embodiment of the invention also provides a kind of construction method of above-mentioned large section tunnel supporting construction, specifically include as
Lower step:
Step S1 excavates left pilot tunnel top bar 11, and the area for excavating cross section is 35m2~45m2, excavation drilling depth is 0.5m
~1.0m should apply left pilot tunnel top bar support system after the completion of excavation immediately；It excavates cross section can be according to large section
Size select as the case may be, the area in cross section accounts for the 1/4 of entire large section area.
Step S2 excavates left pilot tunnel and gets out of a predicament or an embarrassing situation 12 after left pilot tunnel top bar 11 excavates 3m~5m, excavates cross section and is
35m2~45m2, excavation drilling depth is 0.5m~1.0m, should apply left pilot tunnel after the completion of excavation immediately and get out of a predicament or an embarrassing situation support system；First open
Dig left pilot tunnel top bar 11, row excavates left pilot tunnel and gets out of a predicament or an embarrassing situation 12 again behind certain operating space to be supplied.Wherein, it is preferred that left
The excavation cross section of pilot tunnel top bar 11 is generally triangular, and get out of a predicament or an embarrassing situation 12 excavation cross section of left pilot tunnel is substantially square, left
Pilot tunnel get out of a predicament or an embarrassing situation 12 excavation cross section it is identical as the excavation cross sectional area of left pilot tunnel top bar 11 so that left pilot tunnel is got out of a predicament or an embarrassing situation
12 can provide strong support for left pilot tunnel top bar 11.
Step S3 applies right pilot tunnel 30 using identical method after left pilot tunnel 10 excavates 10m~18m；That is,
To right pilot tunnel 30, right pilot tunnel top bar 31 is equally first operated, the row excavation right side is led again after right pilot tunnel top bar 31 excavates 3m~5m
Hole gets out of a predicament or an embarrassing situation 32.
Step S4, since the section of middle drift 20 is larger, after right pilot tunnel 30 excavates 10m~18m, middle drift is appeared on the stage
21 excavated section of rank point or so two parts excavate.Each excavation area 40m2~50m2, excavation drilling depth is 0.5m~1.0m, is excavated
Apply the supporting of middle drift top bar and interim perpendicular support 24 immediately after the completion.After step S1-S3, the two sides of middle drift 20 are
Can construction space, can construct from two sides, can first since left 10 side of pilot tunnel excavate middle drift 20, can also be first from the right side
30 side of pilot tunnel is excavated, and is excavated again from the other side after excavating 3m~5m from side, with excavation while being applied support system.
Step S5 excavates step 22 in middle drift, excavation area 55m after middle drift top bar 21 excavates 3m~5m2~
65m2, interim perpendicular support 24 is removed, applies step supporting in middle drift immediately after excavation, step supporting connects left pilot tunnel in middle drift
Top bar supporting and right pilot tunnel top bar supporting form space force transfer system；
Step S6 excavates middle drift and gets out of a predicament or an embarrassing situation 23 after step 22 in middle drift excavates 3m~5m, excavation area 70m2~
90m2, get out of a predicament or an embarrassing situation supporting as excavation applies middle drift.
Specifically, in step sl, left pilot tunnel top bar first layer is first applied in excavation permanently just to prop up on 111, left pilot tunnel
Step temporarily just props up 114 and the interim inverted arch 115 of left pilot tunnel, when left pilot tunnel top bar first layer permanently just appear on the stage by branch 111, left pilot tunnel
Temporarily just branch 114 reaches that can to apply the left pilot tunnel top bar second layer after design strength permanent with the interim inverted arch 115 of left pilot tunnel to rank
Just branch 112；Left pilot tunnel advance support 113 is applied in addition, also synchronizing in digging process, left pilot tunnel advance support 113 can be
Advance anchor bolt, single layer advanced tubule, the double-deck advanced tubule or advanced short tube canopy are selected with specific reference to span is excavated.
In step S3, during excavating right pilot tunnel 30, since the distance between left pilot tunnel 10 and right pilot tunnel 30 are closer, need
The left sedimentation of pilot tunnel 10 and perimeter convergence situation are monitored, prevents from having an impact left pilot tunnel 10 in right 30 digging process of pilot tunnel.It opens
Right pilot tunnel advance support 313 is applied during digging, right pilot tunnel advance support 313 is consistent with the type selecting of left pilot tunnel advance support 113,
It can be equally advance anchor bolt, single layer advanced tubule, the double-deck advanced tubule or advanced short tube canopy.
In step S4, the excavated section of middle drift top bar 21 is 88m2, 20 left part of middle drift is first excavated, and immediately
Permanently just branch 211 and the interim perpendicular support 24 of middle drift top bar first layer is applied, concrete to be sprayed is applied again after reaching design strength
Making the middle drift top bar second layer, permanently just branch 212,20 left part of middle drift excavate right half part after excavating 3m~5m again；It is right
Half part is identical as the form of construction work of left-half.
In step s 5, step 22 in middle drift is excavated after middle drift top bar 21 entirely excavates 3m~5m, before excavation
Interim perpendicular support 24 is removed, the excavation area of step 22 is 60m in middle drift2, the interim inverted arch of middle drift is applied immediately after excavation
221, the both ends of the interim inverted arch 221 of middle drift are separately connected the interim inverted arch 115 of left pilot tunnel and the interim inverted arch 315 of right pilot tunnel, thus
Temporary support is formed at the middle part of large section, forms space force transfer system.
The excavation area of step 22 is 80m in middle drift2, it is that single excavation area is maximum disconnected in entire excavation operation
Face should reinforce the detection of gib internal force and displacement when excavating, prevent temporary support unstability.Step S6 middle drift top bar
Middle drift advance support 213 is applied in 21 digging process, middle drift advance support 213 can be small in advance for advance anchor bolt, single layer
Conduit, the double-deck advanced tubule or advanced short tube canopy, specific structure and left pilot tunnel advance support 113 are consistent.
Further include step S7 after step S6, when applying tunnel double-lining, disposably removes all temporary supports and interim
Inverted arch.In demolishing process, the stress system in tunnel can mutate, the power born originally by temporary support and interim inverted arch
It will all be born by the double-deck permanent just branch, therefore monitoring should be carried out in removing temporary supports.In order to make full use of space, tear open every time
Except length is 8m~12m, according to the compact progress of the working procedure arranged properly, and urgent prediction scheme is carried out, is applied immediately after tearing support open
Two lining form concretes.Wherein urgent prediction scheme includes: and formulates anti-collapse, fault belt water burst before constructing tunnel to gush the side such as mud
Case gets temporary support and relief materials ready, and pile is neat at the scene；Life-saving pipe should be arranged in tunnel, and life-saving pipe should be by face
Extend to two lining enclosed regions；Radio telephone, UPS powered lighting and food etc. are set in hole.
Wherein, the selection principle of left pilot tunnel advance support 113, middle drift advance support 213 and right pilot tunnel advance support 313
Are as follows: when excavating away from degree less than 15m, using advance anchor bolt；When excavating span 15m~20m, using single layer advanced tubule；
When excavating span 20m~25m, using the double-deck advanced tubule；When excavating span greater than 25m, using advanced short tube canopy.Tool
Body, for advance anchor bolt using the hollow bolt of long 3.5m, diameter 25mm, circumferential spacing is 40cm, longitudinal pitch 2.0m, every two
It recycles and overlaps 1.5m, 10 °~15 ° of outer limb；Single layer advanced tubule uses 4.5m × 42mm × 3.5mm steel floral tube, circumferential
Spacing 40cm, longitudinal pitch 3.0m, every two circulations overlap joint 1.5m, outer limb is 10 °~15 °；Slurries use weight ratio for 1:1's
Cement slurry, grouting pressure are 0.5Mpa~1.0Mpa；The outer limb of first layer ductule in the double-deck advanced tubule is 10 °~
15 °, the outer limb of second layer ductule in the double-deck advanced tubule is 30 °；Advanced short tube canopy uses 10m × 89mm × 5mm steel
Floral tube, circumferential spacing 40cm, longitudinal pitch 8m, every two circulations overlap joint 2.0m, 10 °~15 ° of outer limb；Slurries use weight ratio for
The cement slurry of 1:0.6~1 and the calcium chloride of incorporation 3%, grouting pressure are 0.5Mpa~1.5Mpa.It should be noted that double-deck super
The outer limb of two layers of ductule in preceding ductule can also be identical, and be longitudinally staggered 1.5m between two layers of ductule.
In addition, further including step S0 before step S1 to preferably construct: being visited using advance geologic prediction means
The construction situation and underground water developmental state of country rock locating for bright large section tunnel.If rock crusher and rich groundwater, are adjusted
Whole route makes to put down, ordinate shape is avoided, if can not avoid, should take strengthening measure.Advance geologic prediction means mainly have face
Mapping and digital image-forming analysis, TSP203/202 (100~200m of detection range), geological radar (30m~40m), in advance
Horizontal drilling (30m~40m) and infrared detecting water etc..
In addition to this, little using static blasting or control explosion, blasting-vibration acceleration if encountering blast working situation
In 2cm/s, in order to avoid the gib for completion of having constructed and interim inverted arch are destroyed, lead to supporting intensity or insufficient rigidity, in turn
Jeopardize tunnel safety.
In conjunction with Fig. 2~Fig. 8, the construction method of entire large section tunnel supporting construction is described in detail below:
Step S1, the excavation and support of left pilot tunnel top bar 11 are specific as shown in Figure 2: left pilot tunnel should be first set before excavation
Advance support 113, using the short tube canopy of 89 × 5mm of Φ, length 10m, circumferential spacing 40cm, longitudinal pitch 8m, outer limb is 10 °
~15 °；Left pilot tunnel advance support 113 is set up and excavates left pilot tunnel top bar 11 after the completion, excavated section wide 7.5m, high 7.0m, into
Ruler 0.5m~1.0m；Left pilot tunnel top bar first layer is applied after the completion of excavating immediately and permanently just props up 111, left pilot tunnel top bar is interim
Just branch 114 and the interim inverted arch 115 of left pilot tunnel；After concrete to be sprayed reaches design strength, the left pilot tunnel top bar second layer is applied
Permanent just branch 112.
Step S2, left pilot tunnel get out of a predicament or an embarrassing situation 12 excavation and support, it is specific as shown in Figure 3: excavated to left pilot tunnel top bar 11
After 3m~5m, carry out left pilot tunnel get out of a predicament or an embarrassing situation 12 excavation, excavated section wide 7.5m, high 6.0m, drilling depth 0.5m~1.0m；It has excavated
It applies left pilot tunnel immediately after and gets out of a predicament or an embarrassing situation that first layer permanently just get out of a predicament or an embarrassing situation interim just branch 123 by branch 121 and left pilot tunnel；Coagulation to be sprayed
After soil reaches design strength, branch 122 at the beginning of left pilot tunnel gets out of a predicament or an embarrassing situation the second layer permanently is applied.
Step S3, right pilot tunnel top bar 31 and right pilot tunnel get out of a predicament or an embarrassing situation 32 excavation and support, it is specific as shown in Figure 4 and Figure 5:
After left pilot tunnel 10 excavates 15m, right pilot tunnel 30 is applied, the working procedure of right pilot tunnel top bar 31 is identical as step S1, right pilot tunnel
Get out of a predicament or an embarrassing situation 32 working procedure it is consistent with step S2.
Step S4, the excavation and support of middle drift top bar 21, specific as shown in Figure 6: the excavation span of middle drift 20 is big,
Construction risk is high, and vault applies as one of critical construction way.After right pilot tunnel 30 excavates 15m, it is super to apply middle drift
Preceding supporting 213；21 width 16.6m of middle drift top bar, high 6.0m, 0.5~1.0m of drilling depth excavate in two times, first excavate left side
Part, and apply middle drift top bar first layer immediately permanently just branch 211 and interim perpendicular support 24, the middle drift top bar second layer are permanent
Just branch 212；Right side part, left-half of the supporting construction with middle drift top bar 21 are excavated after drilling depth 3m again.
Step S5, the excavation and support of step 22 in middle drift, it is specific as shown in Figure 7: step 22 excavates in middle drift
Preceding first dismounting is interim to erect support 24, and specific dismounting time point should carry out after vault is permanently just propped up up to design strength, remove Shi Yingjia
The monitoring of strong Vault settlement, Vault settlement aggregate-value should not exceed 20mm, and the rate of settling should not exceed 3mm/d；To settlement stability
The excavation of step 22 in middle drift is carried out afterwards, and the wide 13.5m of excavated section, high 4.5m, drilling depth 0.5m~1.0m are immediately applied
The interim inverted arch 221 of middle drift, being allowed to be connected with the interim inverted arch 115 of left pilot tunnel and the interim inverted arch 315 of right pilot tunnel is collectively formed supporting
It is whole.
Step S6, middle drift get out of a predicament or an embarrassing situation 23 excavation and support, it is specific as shown in Figure 8: excavate 3 to step 22 in middle drift
Excavate middle drift after~5m and get out of a predicament or an embarrassing situation 23, excavated section wide 13m, high 6.5m, 0.5~1.0m of drilling depth, immediately apply in lead
Branch 231 and middle drift at the beginning of first layer is got out of a predicament or an embarrassing situation permanently in hole are got out of a predicament or an embarrassing situation, and the second layer is permanently first to prop up 232.
Step S7 removes all interim just branch and interim inverted arch, pours two linings: the institute between removal step S1~step S6
There are interim just branch and interim inverted arch, including left pilot tunnel top bar temporarily just leave office by branch 114, the interim inverted arch 115 of left pilot tunnel, left pilot tunnel
Temporarily first branch 123, the interim inverted arch 221 of middle drift, right pilot tunnel top bar temporarily just prop up the interim inverted arch 315 of 314, right pilot tunnel and the right side to rank
Pilot tunnel, which is got out of a predicament or an embarrassing situation, temporarily just props up 323.Since the gib that the step working procedure is removed is more, first branch stress check calculation is big, once
Property to remove length be 10m, apply two linings after dismounting immediately, two linings build armored concrete, main reinforcement Φ using 75cm thickness C40 mould
25mm, thick 100mm.
It was verified that large section tunnel support construction method provided by the invention, is led based on traditional double side wall
Hole method SAB is additionally provided with temporary support (temporary supports, abridge S), interim inverted arch (temporary
Inverted arch, abridge A) and interim perpendicular support (temporary vertical bracing, abridge B), to form bilateral
Large section tunnel supporting construction of the wall base tunnel in conjunction with SAB supporting methods, the supporting construction effectively draw large section tunnel
It is divided into light section construction, is divided into left pilot tunnel 10, middle drift 20 and 30 3 base tunnels of right pilot tunnel from left to right, wherein cross-sectional area is most
Big middle drift 20 is divided into three steps from top to bottom, and working procedure is compact, and construction method is more flexible, applied widely；Simultaneously
Using the double-deck preliminary bracing, support rigidity is big, it is ensured that the safety for tearing support operating condition tunnel open reduces engineering risk, therefore has
Have wide practical use.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of large section tunnel supporting construction, which is characterized in that including left pilot tunnel, middle drift and right pilot tunnel, the left side is led
Hole, the middle drift are sequentially arranged with the right pilot tunnel along the width direction of large section, and the left pilot tunnel includes on left pilot tunnel
Step and left pilot tunnel are got out of a predicament or an embarrassing situation, and the left pilot tunnel top bar is located at the top that the left pilot tunnel is got out of a predicament or an embarrassing situation, and the middle drift includes
Step and middle drift are got out of a predicament or an embarrassing situation in middle drift top bar, middle drift, step and institute in the middle drift top bar, the middle drift
It states the short transverse that middle drift is got out of a predicament or an embarrassing situation along the middle drift to be sequentially arranged, be provided in the middle drift top bar interim perpendicular
Support, the right pilot tunnel includes that right pilot tunnel top bar and right pilot tunnel are got out of a predicament or an embarrassing situation, and the right pilot tunnel top bar is located under the right pilot tunnel
The top of step.
2. large section tunnel supporting construction according to claim 1, which is characterized in that the middle drift top bar includes
Middle drift top bar first layer permanently just branch, the middle drift top bar second layer permanently just branch and middle drift advance support, it is described in
Pilot tunnel advance support is located at the outside that the middle drift top bar first layer permanently just props up, and the middle drift top bar second layer is forever
Just branch is located at the inside that the middle drift top bar first layer permanently just props up long, and the interim perpendicular support is along the middle drift top bar
Short transverse extend, the middle drift top bar is separated into two base tunnels in left and right by the interim perpendicular support.
3. large section tunnel supporting construction according to claim 2, which is characterized in that the left pilot tunnel top bar includes
Left pilot tunnel top bar first layer permanently just permanently just get out of a predicament or an embarrassing situation including a left side for branch and the left pilot tunnel top bar second layer by branch, the left pilot tunnel
Branch and left pilot tunnel at the beginning of pilot tunnel gets out of a predicament or an embarrassing situation first layer permanently are got out of a predicament or an embarrassing situation, and permanently just branch, the right pilot tunnel top bar supporting include the second layer
Right pilot tunnel top bar first layer permanently just permanently just get out of a predicament or an embarrassing situation supporting packet for branch and the right pilot tunnel top bar second layer by branch, the right pilot tunnel
Include right pilot tunnel get out of a predicament or an embarrassing situation first layer permanently just branch and right pilot tunnel get out of a predicament or an embarrassing situation the second layer permanently just branch, the middle drift get out of a predicament or an embarrassing situation including
Branch and middle drift at the beginning of middle drift gets out of a predicament or an embarrassing situation first layer permanently are got out of a predicament or an embarrassing situation, and the second layer is permanently first to be propped up, the left pilot tunnel top bar first layer
Permanent just branch, the left pilot tunnel are got out of a predicament or an embarrassing situation, and first layer permanently just get out of a predicament or an embarrassing situation first layer permanently just branch, the right side by branch, the middle drift
Pilot tunnel is got out of a predicament or an embarrassing situation, and first layer permanently just props up, the right pilot tunnel top bar first layer permanently just props up, the middle drift top bar first
Permanently just Zhi Shunci joins end to end to form first layer permanently first branch layer, and the left pilot tunnel top bar second layer permanently just props up, is described
Left pilot tunnel gets out of a predicament or an embarrassing situation the second layer permanently just branch, the middle drift are got out of a predicament or an embarrassing situation, and permanently just branch, the right pilot tunnel get out of a predicament or an embarrassing situation the to the second layer
The permanent first permanent first Zhi Shun of branch, the middle drift top bar second layer of two layers of permanent just branch, right pilot tunnel top bar second layer
Secondary to join end to end to form the second layer permanently first branch, permanently just branch is located at the second layer permanently first outside propped up to the first layer.
4. large section tunnel supporting construction according to claim 1-3, which is characterized in that on the left pilot tunnel
Step includes the interim inverted arch of left pilot tunnel, and step includes the interim inverted arch of middle drift in the middle drift, the right pilot tunnel top bar packet
Include the interim inverted arch of right pilot tunnel, the interim inverted arch of the left pilot tunnel, the interim inverted arch of the middle drift and the right interim inverted arch edge of pilot tunnel
The width direction of large section is sequentially connected.
5. large section tunnel supporting construction according to claim 1-3, which is characterized in that on the left pilot tunnel
Step includes that left pilot tunnel top bar temporarily just get out of a predicament or an embarrassing situation to get out of a predicament or an embarrassing situation including left pilot tunnel and temporarily just prop up by branch, the left pilot tunnel, the left side
Pilot tunnel top bar temporarily just get out of a predicament or an embarrassing situation interim just Zhi Xianglian by branch and the left pilot tunnel, and the right pilot tunnel top bar includes on right pilot tunnel
Step temporarily get out of a predicament or an embarrassing situation to get out of a predicament or an embarrassing situation including right pilot tunnel and temporarily just prop up by first branch, the right pilot tunnel, and the right pilot tunnel top bar is temporarily first
Prop up Zhi Xianglian at the beginning of getting out of a predicament or an embarrassing situation temporarily with the right pilot tunnel.
6. large section tunnel supporting construction according to claim 1, which is characterized in that the left pilot tunnel is led with the right side
The digging cross-sectional area in hole is identical, respectively accounts for the 1/4 of entire tunnel excavation section, and the left pilot tunnel top bar and the left pilot tunnel are left office
Rank halves the left pilot tunnel along its short transverse, and the right pilot tunnel top bar is got out of a predicament or an embarrassing situation with the right pilot tunnel leads the right side
Hole is halved along height, along the middle drift top bar, the middle drift step and step in the middle drift will be described in lead
Hole is along short transverse trisection.
7. a kind of construction method built such as the described in any item large section tunnel supporting construction of right 1-6, which is characterized in that
Include the following steps:
Step S1, excavates left pilot tunnel top bar, and excavation cross section is 35m2~45m2, excavation drilling depth is 0.5m~1.0m, has been excavated
Cheng Houying applies left pilot tunnel top bar supporting immediately；
Step S2 excavates left pilot tunnel and gets out of a predicament or an embarrassing situation after left pilot tunnel top bar excavates 3m~5m, and excavation cross section is 35m2~45m2,
Excavation drilling depth is 0.5m~1.0m, should apply left pilot tunnel after the completion of excavation immediately and get out of a predicament or an embarrassing situation supporting；
Step S3 applies right pilot tunnel using identical method after left pilot drive 10m~18m；
Step S4, after right pilot drive 10m~18m, middle drift top bar excavated section point or so two parts are excavated, and are opened every time
Dig area 40m2~50m2, excavation drilling depth is 0.5m~1.0m, applies middle drift top bar supporting and interim after the completion of excavating immediately
Perpendicular support；
Step S5 excavates step in middle drift, excavation area 55m after middle drift top bar excavates 3m~5m2~65m2, remove
It is interim to erect support, step supporting in middle drift is applied immediately after excavation, and step supporting connects on the left pilot tunnel in the middle drift
Step supporting and the right pilot tunnel top bar supporting form space force transfer system；
Step S6 excavates middle drift and gets out of a predicament or an embarrassing situation after bench excavation 3m~5m in middle drift, excavation area 70m2~90m2, with
Excavation applies middle drift and gets out of a predicament or an embarrassing situation supporting.
8. the construction method of large section tunnel supporting construction according to claim 7, which is characterized in that in step S4,
Middle drift left part is first excavated, and applies the permanent just branch of middle drift top bar first and the interim perpendicular support immediately, it is to be sprayed
Concrete applies the permanent just branch of middle drift top bar second after reaching design strength again, after middle drift left part excavates 3m~5m
Right half part is excavated again；
In step S5, step in middle drift is excavated after middle drift top bar excavates 3m~5m, interim perpendicular support is removed before excavating, is opened
The interim inverted arch of middle drift is applied after digging immediately, the both ends of the interim inverted arch of middle drift are separately connected the interim inverted arch of left pilot tunnel
With the right interim inverted arch of pilot tunnel.
9. the construction method of large section tunnel supporting construction according to claim 7 or 8, which is characterized in that step S1
In left pilot tunnel advance support is first set up before excavation, right pilot tunnel advance support is also applied in the digging process of step S3, in step
Middle drift advance support, the left pilot tunnel advance support, the right pilot tunnel are applied after right pilot drive 10m~18m in rapid S4
Advance support and the middle drift advance support are equal are as follows: when excavating away from degree less than 15m, using advance anchor bolt；When excavation span
When 15m~20m, using single layer advanced tubule；When excavating span 20m~25m, using the double-deck advanced tubule；Work as excavation
When span is greater than 25m, using advanced short tube canopy.
10. the construction method of large section tunnel supporting construction according to claim 7, which is characterized in that in step S1
Before, further include step S0: verifying the construction situation and ground of country rock locating for large section tunnel using advance geologic prediction means
It is lauched developmental state.
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| CN111206933A (en) * | 2020-01-20 | 2020-05-29 | 西南交通大学 | Tunnel construction method for traversing karst water-rich section |
| CN112302662A (en) * | 2020-10-29 | 2021-02-02 | 中铁上海工程局集团有限公司 | Construction method of artificial backfill shallow-buried tunnel passing through highway |
| CN115824813A (en) * | 2023-02-23 | 2023-03-21 | 叙镇铁路有限责任公司 | Test device and method for testing surrounding rock plastic zone range caused by tunnel excavation |
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