CN108049876A - A kind of construction method of compound stratum tunneling close range down bored tunnel - Google Patents
A kind of construction method of compound stratum tunneling close range down bored tunnel Download PDFInfo
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- CN108049876A CN108049876A CN201711114638.8A CN201711114638A CN108049876A CN 108049876 A CN108049876 A CN 108049876A CN 201711114638 A CN201711114638 A CN 201711114638A CN 108049876 A CN108049876 A CN 108049876A
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 230000005641 tunneling Effects 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 title claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000013461 design Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 27
- 238000009432 framing Methods 0.000 claims description 17
- 210000005239 tubule Anatomy 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000007569 slipcasting Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 6
- 239000011440 grout Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000007596 consolidation process Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/124—Helical conveying means therefor
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to a kind of construction method of compound stratum tunneling close range down bored tunnel, including：Constructing tunnel prepares；Come in and go out line bored tunnel preparation of construction；Monitoring measurement preparation before passing through；Control measure during shield crossing；Section of jurisdiction reinforces in shield tunnel；Monitoring frequency controls；Control is maked an inspection tour in hole.The beneficial effects of the invention are as follows：The method of the present invention step is simple, design is reasonable and construction is simple is convenient, and input cost is relatively low, and Practical Project operation implementation is strong；It can be improved down by the method for the invention and wear drivage efficiency, control attitude of shield machine, so as to reduce the possibility that accident occurs for tunnel, favourable basis is laid for follow-up successfully pass through；Practical value is high and using effect is good, compared to bored tunnel construction method is worn under existing, shortens the construction period, larger to reduce construction cost.
Description
Technical field
It is near more particularly, to a kind of compound stratum shield the invention belongs to shield tunnel construction and reinforcement protection technical field
The construction method of bored tunnel is worn under distance.
Background technology
In recent years, as city underground and the Large scale construction of related municipal works, the application of shield tunnel at home are got over
Come more.It is the construction stage that Shield Construction Technique difficulty is big, process is more complicated that bored tunnel is worn under shield machine.Once processing is not
When the soil body easily caves in or is lost in or even makes shield out of hand between structure.
Shield machine has many difficult points in through section work progress.For example it be easy to cause and backbreaks in shield tunneling process, partially
From line direction, shield-tunneling construction is affected greatly；For another example shield shaping section of jurisdiction leak is more serious, ensures waterproof construction matter
Amount avoids the leakage of underground water, can if dealing with improperly for ensuring that safety of subway operation and protection ambient enviroment are most important
It further increases and destroys or even tunnel cave, life threatening and property safety can be caused.
Shield machine over long distances, on tunneled under earth pressure balance pattern in soft lower hard compound stratum, be easy to cause cutterhead and soil
Storehouse mud lining can aggravate the abrasion of cutter, and periphery hobboing cutter is larger in the impact load suffered by soft or hard boundary position, be easy to cause rolling
The cutter ring of knife bursts apart, and cutter is lost the job function, and the cleaning mud cake that opens a position can cause surface subsidence, influence ground and bored tunnel
Safety.
The content of the invention
The purpose of the present invention is overcoming deficiency of the prior art, a kind of compound stratum tunneling close range down tunneling is provided
The construction method in tunnel, method and step is simple, and design is rationally and easy construction, construction effect are good, can be to bored tunnel and shield
It is effectively reinforced, the cycle is short and at low cost.
The purpose of the present invention is what is be achieved through the following technical solutions：
The construction method of this compound stratum tunneling close range down bored tunnel, comprises the following steps：
1) constructing tunnel prepares；
Amount of 1-1) being unearthed control：The amount of being unearthed is carried out before driving to control and make a record；Using high pressure water dabbing machine or other
Mechanical dabbing machine carries out high pressure water cleaning to intending repairing section of jurisdiction ring progress dabbing to the surface after dabbing, until exposing coarse
Strong surface；
1-2) synchronous grouting；
1-3) secondary grouting：Ring carries out secondary grouting after driving；
2) come in and go out line bored tunnel preparation of construction；
2-1) preliminary bracing：Shield bored tunnel preliminary bracing before driving, which will construct, to be completed；
2-2) advanced tubule is constructed：Advanced tubule is placed according to design requirement, using roof-bolter by advanced tubule
It squeezes into, advanced tubule tail end is welded on steelframe；Aperture outside sealer occlusion catheter is used after advanced tubule installation, and it is pre-
Stay grouting port；
2-3) preliminary bracing backfill slip casting behind；
2-4) reinforced in bored tunnel：According to reinforcement criteria reinforce in hole before shield crossing, using full framing pair
Tunnel is reinforced, and shield can pass through after the completion of reinforcing；
3) monitoring measurement preparation before passing through；
3-1) monitoring and controlling：Tunnel monitoring project is ground settlement, Vault settlement, horizontal convergence and Tunnel
Apparent observation；Stull axle power is set in full framing, the stull axle power of support system is monitored using pressure gauge, when passing through
According to stress variation situation whether to being reinforced again in bored tunnel hole, carried out when need to reinforce in hole using No. 25 I-steel
Transversely strengthening；
3-2) monitoring point is set：Tunnel layout of the monitoring points：Ground settlement, Vault settlement and horizontal convergence are laid, by shadow
Ring section center line and lay a ground settlement point, first with the impact drilling when monitoring point is embedded, be then placed in subsidence survey point, measuring point with
Separation layer between road surface is set, can start to measure after tested point complete stability；Full framing layout of the monitoring points：Pacify on full framing
Pressure gauge is filled, initial value is taken and makes a record；
4) control measure during shield crossing；
4-1) shield driving state modulator：During tunneling construction, controlled according to the boring parameter drafted；Management soil amount,
Screw conveyor rotating speed is determined according to cutterhead rotating speed；Strengthen monitoring during shield crossing bored tunnel, and according to monitoring number
According to continuing to optimize and adjust boring parameter, constantly improve construction technology；
4-2) grouting and reinforcing controls；
4-3) secondary grouting controls：Added according to left line grouting and reinforcing region and right line grouting and reinforcing region institute's partition domain
Gu；
5) section of jurisdiction reinforces in shield tunnel：Bored tunnel carries out median septum after the completion of shield driving and interim inverted arch is removed
When, Shield simultaneously reinforces shaping section of jurisdiction, is reinforced using No. 20 channel steels；
6) monitoring frequency controls：It is monitored in real time in shield tunneling process, monitoring data notify shield when being more than early warning value
Unit stops construction, evacuates personnel, and carries out consolidation process in bored tunnel hole；
7) control is maked an inspection tour in hole：Twenty four hours is observed in bored tunnel hole, and observation preliminary bracing surface whether there is
Situations such as cracking, mud or slurry infiltration, as found to report and shutting down processing.
As preferred：In the step 7), when bored tunnel preliminary bracing deforms or hard stop during crack；When dark
When substantial amounts of foam mud occurs for preliminary bracing of holing, cement grout is gushed out, hard stop, and carry out slip casting to gushing out position
It reinforces, sondage checks whether still have foam mud, cement grout to gush out into a ring again after the completion of reinforcing, if there is then shutting down, such as
It is no then at this slip casting have cavity, then continue sondage into.
The beneficial effects of the invention are as follows：
(1) method and step is simple, design is reasonable and construction is simple is convenient, and input cost is relatively low, and Practical Project operation is implemented
Property is strong.
(2) it can be improved down by the method for the invention and wear drivage efficiency, attitude of shield machine be controlled, so as to reduce tunnel
The possibility of generation accident lays favourable basis for follow-up successfully pass through.
(3) practical value is high and using effect is good, compared to bored tunnel construction method is worn under existing, shortens construction work
It is phase, larger to reduce construction cost.
(4) it is widely applicable, all bored tunnel constructions can be effectively applicable to and shield reinforces the particularly ground such as compound stratum
The geology of matter situation complexity has ensured that shield is subsequently passed through that everything goes well with your work and carried out.
Description of the drawings
Fig. 1 is the method flow block diagram of the present invention；
Fig. 2 is shield tunnel and the field wire vertical section relational graph that comes in and goes out；
Fig. 3 is that tunnel full framing reinforces schematic diagram；
Fig. 4 is that I-steel reinforces schematic diagram in hole；
Fig. 5 is shield consolidation grouting area schematic；
Fig. 6 is that Shield shaping section of jurisdiction reinforces schematic diagram；
Reference sign：Advanced tubule 1；Isolation pile 2；Full framing 3；No. 25 I-steel 4；Zuo Xian grouting and reinforcings area
Domain 5；Right line grouting and reinforcing region 6；No. 20 channel steels 7.
Specific embodiment
The present invention is described further with reference to embodiment.The explanation of following embodiments is only intended to help to understand this
Invention.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, also
Can to the present invention some improvement and modification can also be carried out, these improvement and modification also fall into the protection domain of the claims in the present invention
It is interior.
The construction method technological process of compound stratum tunneling close range down bored tunnel as shown in Figure 1.Shield crossing
It is preceding according to reinforcement criteria reinforce in hole, using the method for supporting between 1 close tunnel of advanced tubule, using such as Fig. 3 institutes
The full framing 3 shown reinforces its tunnel, and shield can pass through after the completion of reinforcing.And stull axis is set in full framing 3
Power is monitored support system using pressure gauge, the stull axle power of main monitoring system, according to stress variation situation when passing through
Whether to being reinforced again in bored tunnel hole, during if you need to reinforce, in hole using No. 25 I-steel 4 as shown in Figure 4 into
Row transversely strengthening.Using secondary grouting reinforcement measure as shown in Figure 5, reinforcing scope is left line grouting and reinforcing region 5 and right line
Grouting and reinforcing region 6 respectively 60 ° above and below tunnel horizontal axis, amounts to 120 °.Bored tunnel carries out after the completion of shield driving
When median septum and interim inverted arch are removed, Shield simultaneously reinforces shaping section of jurisdiction, uses 3 20 as shown in Figure 6
Number channel steel 7, which reinforce, prevents shaping segment deformation.It is as follows：
1. constructing tunnel prepares
The 1-1. amount of being unearthed controls
Special messenger is arranged to carry out this before driving to control and make a record.
Using high pressure water dabbing machine or other machinery dabbing machine to intending repairing section of jurisdiction ring progress dabbing, and to the table after dabbing
Face carries out high pressure water cleaning, it is ensured that all cleans up sludge, the oil stain on section of jurisdiction, until exposing coarse strong surface.
1-2. synchronous grouting
The presetting period is 4.5~5h after synchronous grouting presses first wife's composition and division in a proportion mixing, and first wife's composition and division in a proportion is adjusted before driving, will
Presetting period is controlled in 3.5~4h.
1-3. secondary grouting
Ring carries out secondary grouting after driving, prevents tunnel decompression.
2. come in and go out line bored tunnel preparation of construction
2-1. preliminary bracing
Shield bored tunnel preliminary bracing before driving must complete construction.
2-2. advanced tubules are constructed
Advanced tubule 1 is placed according to design requirement, is directly squeezed into using roof-bolter, 1 protruded length 0.3 of advanced tubule
~0.4m, strictly by design requirement, tail end is welded on steelframe outer limb.Advanced tubule 1 is led after installing with sealer closure
Aperture outside pipe, and reserved grouting port.
2-3. preliminary bracings backfill slip casting behind
After 8~12m is completed in preliminary bracing, it is necessary to backfill slip casting behind is carried out, to consolidate scall and filling after hogback
Gap that may be present, and stratum loosening and ground settlement are reduced to greatest extent.
It is reinforced in 2-4. bored tunnels
It must carry out reinforcing in hole according to reinforcement criteria before shield crossing, using full framing 3 as shown in Figure 3 to tunnel
It is reinforced, stent spacing control shield after the completion of 0.5 × 0.6m, reinforcing can pass through.
3. monitoring measurement preparation before passing through
3-1. monitoring and controlling
Tunnel monitoring project is：Ground settlement, Vault settlement, horizontal convergence and the apparent observation of Tunnel.
Full framing 3 sets stull axle power, support system is monitored using pressure gauge, the stull axle power of main monitoring system is worn
According to stress variation situation whether to being reinforced again in bored tunnel hole when more, used in hole such as Fig. 4 institutes during if you need to reinforce
No. 25 I-steel 4 shown carry out transversely strengthening.
3-2. monitoring points are set
Tunnel layout of the monitoring points：Ground settlement, Vault settlement and horizontal convergence are laid by spacing 5m, in impacted section
Line lays a ground settlement point every 5m.First subsidence survey point is then placed in, measuring point is adopted with the impact drilling when monitoring point is embedded
With 22 reinforcing bars of Φ, length 800mm.Separation layer is set between measuring point and road surface, it is ensured that measuring point and lower part soil solidifying and top road
Face separates.After tested point complete stability, you can start to measure.
3 layout of the monitoring points of full framing：Pressure gauge is installed on full framing 3, before first 9m sections between 3 pressure gauges
It is remaining to be laid by spacing 1.8m away from for 0.9m, it takes initial value and makes a record, if the axle power for measuring stull is smaller,
The laying distance of pressure gauge is adjusted to 5m mono-.
4. the control measure during shield crossing
4-1. shield driving state modulators
During tunneling construction, controlled in strict accordance with the boring parameter drafted.
Stringent soil buret reason, screw conveyor rotating speed is determined according to cutterhead rotating speed.Per the control of the ring amount of being unearthed in 64m3Within,
Reduce soil disturbance.
Shield axial line control off-design axis is not more than ± 20mm, forbids excess correction, snakelike swing when passing through.
Strengthen monitoring during shield crossing bored tunnel, and continued to optimize according to monitoring data and adjust driving ginseng
Number, constantly improve construction technology.
4-2. grouting and reinforcings control
Synchronous grouting serous fluid of mending strictly presses cement：Fine sand：Flyash：Bentonite：Water=250：765：270：105：540
Match ratio carries out mix；
Synchronous grouting pressure controls：Top grouting pressure is 1.0~1.5bar, and lower part is 1.0~2.0bar, per ring slip casting
Amount control is in 4.8~5.5m3。
4-3. secondary groutings control
It is reinforced according to left line grouting and reinforcing region 5 as shown in Figure 5 and right 6 partition domains in line grouting and reinforcing region,
Totally 120 °.Secondary grouting match ratio is in strict accordance with 1:1 carries out mix；The control of secondary grouting pressure is in 0.2~0.3MPa, the note per ring
Slurry amount is controlled in 4.8m2Left and right.
5. section of jurisdiction reinforces in shield tunnel
When bored tunnel carries out median septum and the dismounting of interim inverted arch after the completion of shield driving, Shield is right simultaneously
Shaping section of jurisdiction is reinforced, and using 3 No. 20 channel steels 7 reinforce prevents shaping segment deformation.
6. monitoring frequency controls
It is monitored in real time in shield tunneling process, monitoring frequency is no more than 20~30 minutes once, before and after shield driving
Implement real-time monitoring (to monitor once and make a record before every ring driving, make a record when driving is monitored again after finishing, two
Secondary record carries out comparison and checks whether the size of changing value meets the requirements), when the monitoring frequency after shield driving is 1 time/4 small.
Shield unit is notified to stop construction when being more than early warning value such as monitoring data immediately, personnel is evacuated, and carries out bored tunnel hole in time
Interior consolidation process, vault sinking amount must not exceed 40mm, and haunch everywhere convergent must not exceed 25mm, when measurement data is accumulated over permitting
Perhaps report and shut down immediately during scope.
7. control is maked an inspection tour in hole
It arranges to be observed in bored tunnel hole when special messenger 24 is small, observer is divided into 3 people, and configures intercom, 1 people
Monitoring room is arranged in, 1 people is arranged at bored tunnel well head, and 1 people is arranged at driving.Main detection preliminary bracing surface whether there is
Cracking, mud, slurry infiltration situation etc. such as find to report immediately and shut down processing.
Processing method：
1) when bored tunnel preliminary bracing deforms or hard stop during crack.
2) when substantial amounts of foam mud occurs for bored tunnel preliminary bracing, cement grout is gushed out, hard stop, and to gushing
Go out position and carry out grouting and reinforcing, sondage checks whether still have foam mud, cement grout to gush out into a ring again after the completion of reinforcing, such as
Still hard stop sometimes, such as no longer when, illustrating at this that slip casting is not full is free hole, can continue sondage into.
The solution of the present invention is suitable for wearing bored tunnel construction under compound stratum shield, and shield and bored tunnel are added
Gu.The present invention is using CRD method excavation constructions, the supporting between close tunnel using advanced tubule 1, and preliminary bracing is using behind
The method for backfilling 3 supporting of grouting support combination full framing and No. 20 7 reinforcing shield sections of jurisdiction of channel steel, and during shield crossing
Boring parameter and grouting and reinforcing are controlled, there are the advantages such as stability is high, speed of application is fast.And can guarantee construction quality, it ensures
Everything goes well with your work carries out for follow-up shield crossing.
Claims (2)
1. a kind of construction method of compound stratum tunneling close range down bored tunnel, which is characterized in that comprise the following steps：
1) constructing tunnel prepares：
Amount of 1-1) being unearthed control：The amount of being unearthed is carried out before driving to control and make a record；Using high pressure water dabbing machine or other machinery
Dabbing machine carries out high pressure water cleaning to intending repairing section of jurisdiction ring progress dabbing to the surface after dabbing, until exposing coarse strong
Surface；
1-2) synchronous grouting；
1-3) secondary grouting：Ring carries out secondary grouting after driving；
2) come in and go out line bored tunnel preparation of construction：
2-1) preliminary bracing：Shield bored tunnel preliminary bracing before driving, which will construct, to be completed；
2-2) advanced tubule is constructed：Advanced tubule (1) is placed according to design requirement, using roof-bolter by advanced tubule
(1) squeeze into, advanced tubule (1) tail end is welded on steelframe；With outside sealer occlusion catheter after advanced tubule (1) installation
Aperture, and reserved grouting port；
2-3) preliminary bracing backfill slip casting behind；
2-4) reinforced in bored tunnel：According to reinforcement criteria reinforce in hole before shield crossing, using full framing (3) to tunnel
Road is reinforced, and shield can pass through after the completion of reinforcing；
3) monitoring measurement preparation before passing through：
3-1) monitoring and controlling：Tunnel monitoring project is ground settlement, Vault settlement, horizontal convergence and Tunnel are apparent
Observation；Stull axle power is set in full framing (3), the stull axle power of support system is monitored using pressure gauge, when passing through
According to stress variation situation whether to being reinforced again in bored tunnel hole, No. 25 I-steel (4) are used when need to reinforce in hole
Carry out transversely strengthening；
3-2) monitoring point is set：Tunnel layout of the monitoring points：Ground settlement, Vault settlement and horizontal convergence are laid, at impacted section
Center line lays a ground settlement point, and first subsidence survey point, measuring point and road surface are then placed in the impact drilling when monitoring point is embedded
Between separation layer is set, can start to measure after tested point complete stability；Full framing (3) layout of the monitoring points：On full framing (3)
Pressure gauge is installed, initial value is taken and makes a record；
4) control measure during shield crossing：
4-1) shield driving state modulator：During tunneling construction, controlled according to the boring parameter drafted；Management soil amount, according to
Cutterhead rotating speed determines screw conveyor rotating speed；During shield crossing bored tunnel strengthen monitoring, and according to monitoring data into
Row optimizes and adjusts boring parameter to improve construction technology；
4-2) grouting and reinforcing controls；
4-3) secondary grouting controls：It is carried out according to left line grouting and reinforcing region (5) and right line grouting and reinforcing region (6) institute's partition domain
It reinforces；
5) section of jurisdiction reinforces in shield tunnel：When bored tunnel carries out median septum and the dismounting of interim inverted arch after the completion of shield driving,
Shield simultaneously reinforces shaping section of jurisdiction, is reinforced using No. 20 channel steels (7)；
6) monitoring frequency controls：It is monitored in real time in shield tunneling process, shield unit is notified when monitoring data are more than early warning value
Stop construction, evacuate personnel, and carry out consolidation process in bored tunnel hole；
7) control is maked an inspection tour in hole：Twenty four hours is observed in bored tunnel hole, observation preliminary bracing surface whether there is cracking,
Situations such as mud or slurry infiltration, as found to report and shutting down processing.
2. the construction method of compound stratum tunneling close range down bored tunnel according to claim 1, it is characterised in that：
In the step 7), when bored tunnel preliminary bracing deforms or hard stop during crack；When bored tunnel preliminary bracing is sent out
When raw substantial amounts of foam mud, cement grout are gushed out, hard stop, and grouting and reinforcing is carried out to gushing out position, after the completion of reinforcing
Sondage checks whether still have foam mud, cement grout to gush out into a ring again, if there is then shutting down, as without if there is slip casting at this
Cavity, then continue sondage into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711114638.8A CN108049876A (en) | 2017-11-13 | 2017-11-13 | A kind of construction method of compound stratum tunneling close range down bored tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711114638.8A CN108049876A (en) | 2017-11-13 | 2017-11-13 | A kind of construction method of compound stratum tunneling close range down bored tunnel |
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| CN108049876A true CN108049876A (en) | 2018-05-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184756A (en) * | 2018-10-17 | 2019-01-11 | 中建八局轨道交通建设有限公司 | For removing the device and method of negative endless tube piece in shield dark-excavated passageway |
| CN111335903A (en) * | 2020-04-26 | 2020-06-26 | 粤水电轨道交通建设有限公司 | Construction method for penetrating dense building group downwards in stratum of joint zone |
| CN111720125A (en) * | 2020-05-15 | 2020-09-29 | 龙德建设有限公司 | Construction process for tunnel underpass highway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109184756A (en) * | 2018-10-17 | 2019-01-11 | 中建八局轨道交通建设有限公司 | For removing the device and method of negative endless tube piece in shield dark-excavated passageway |
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| CN111335903A (en) * | 2020-04-26 | 2020-06-26 | 粤水电轨道交通建设有限公司 | Construction method for penetrating dense building group downwards in stratum of joint zone |
| CN111720125A (en) * | 2020-05-15 | 2020-09-29 | 龙德建设有限公司 | Construction process for tunnel underpass highway |
| CN112855262A (en) * | 2021-01-15 | 2021-05-28 | 大连交通大学 | Method for removing middle partition wall of newly-built subway station close-contact underpass existing station by PBA construction method |
| CN112855262B (en) * | 2021-01-15 | 2023-03-03 | 大连交通大学 | Method for removing middle partition wall of newly-built subway station close-contact underpass existing station by PBA construction method |
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Application publication date: 20180518 |