CN110284885A - Shield inspection-pit construction method - Google Patents
Shield inspection-pit construction method Download PDFInfo
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- CN110284885A CN110284885A CN201910550294.8A CN201910550294A CN110284885A CN 110284885 A CN110284885 A CN 110284885A CN 201910550294 A CN201910550294 A CN 201910550294A CN 110284885 A CN110284885 A CN 110284885A
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- inspection
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- excavated
- shield machine
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- 238000010276 construction Methods 0.000 title claims abstract description 59
- 238000012423 maintenance Methods 0.000 claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 241000269793 Cryothenia peninsulae Species 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 13
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 10
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 7
- 239000004927 clay Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002356 single layer Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000009472 formulation Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000002689 soil Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000007569 slipcasting Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000009189 diving Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
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- 210000003205 muscle Anatomy 0.000 description 2
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- 239000004576 sand Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 241001669679 Eleotris Species 0.000 description 1
- 239000011398 Portland cement Substances 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
- 238000005056 compaction Methods 0.000 description 1
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- 210000004681 ovum Anatomy 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Wood Science & Technology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention provides a kind of shield inspection-pit construction methods, comprising the following steps: S1) before overhauling well construction, in the cast-in-place formation concrete collar tie beam of the pithead position of inspection-pit to be excavated；S2) grouting and reinforcing is carried out in earth's surface inspection-pit surrounding setting grouting sleeve valve pipe to be excavated；S3 it) excavates to form multiple dewatering wells in inspection-pit surrounding to be excavated tunnel two sides；S4 it) is taken from earth's surface and mechanical excavates inspection-pit elevation location on cutter head of shield machine into tunnel；S5) since on cutter head of shield machine elevation location, forming inspection-pit using hand digging to projected depth in tunnel；S6) after carrying out maintenance or cutter head of shield machine replacement to shield machine, inspection-pit is backfilled using sandstone.Shield inspection-pit construction method can find out situations such as cobble, erratic boulder are distributed, and provide geologic basis for next step solution formulation；Maintenance or cutterhead replacement can be carried out to shield machine simultaneously, and is capable of providing safe operating environment.
Description
Technical field
The present invention relates to technical field of tunnel construction, and in particular to a kind of shield inspection-pit construction method.
Background technique
Tunnelling during, it usually needs excavated using shield machine, due to excavate soil layer in there are ovum
Stone, erratic boulder distribution, damage the cutterhead of shield machine, or the screw machine of blocking shield machine, cause cutterhead repeatedly to occur stuck
Stop jumping, there are abnormal sounds, dregs to be discharged for cutterhead in driving, and thrust, soil pressure increase, and situations such as can not normally promoting, needs pair
Cutterhead replace or overhaul to screw machine.
Summary of the invention
Situations such as present invention provides a kind of shield inspection-pit construction method, can find out cobble, erratic boulder distribution, and be next
It walks solution formulation and geologic basis is provided；Maintenance or cutterhead replacement can be carried out to the shield machine simultaneously, and is capable of providing safety
Operating environment.
Shield inspection-pit construction method provided by the invention is the following steps are included: S1) before overhauling well construction, wait dig
Dig the cast-in-place formation concrete collar tie beam of pithead position of inspection-pit；S2 it) is carried out in earth's surface inspection-pit surrounding setting grouting sleeve valve pipe to be excavated
Grouting and reinforcing；S3 it) excavates to form multiple dewatering wells in the inspection-pit surrounding to be excavated tunnel two sides；S4) machine is taken from earth's surface
Tool formula excavates the inspection-pit elevation location on cutter head of shield machine into tunnel；S5) cutter head of shield machine subscript is high-order from tunnel
Beginning is set, the inspection-pit is formed using hand digging to projected depth；S6 maintenance or cutter head of shield machine) are being carried out to shield machine
After replacement, the inspection-pit is backfilled using sandstone.
Preferably, in the step S1) in, the cast-in-place concrete collar tie beam that formed includes: the walling crib model in inspection-pit to be excavated
In enclosing, surface dust is removed；It constructs and buries well head casing；It pours collar tie beam close to casing inner wall production and is poured in collar tie beam described
Arrange built-in fitting；It pours collar tie beam to described after removing casing and pour forming the concrete collar tie beam.
Preferably, in the step S1) later and before step S2), further includes: it is attached in the well head of inspection-pit to be excavated
Guardrail and water fender is arranged near position.
Preferably, in the step S2) in, it is infused in earth's surface two circle grouting sleeve valve pipe of inspection-pit surrounding setting to be excavated
Slurry is reinforced, and the depth of the grouting sleeve valve pipe is 0.6~1m of the well head of inspection-pit to be excavated or less.
Preferably, in the step S3) in, the excavation step of the dewatering well includes: that drilling forms depth as 45m, aperture
For the hoistway of 600mm；The well casing that installation wall is more than or equal to 3mm in the hoistway, caliber is 280mm；The well casing with
Between the hoistway inner wall ring rockfill English circle gravel and ring fill out clay ball, to form the dewatering well.
Preferably, the tube top of well casing 0.2m above ground level.
Preferably, in the step S4) in, taking from earth's surface and mechanically excavating the inspection-pit includes: using total station
Construction lofting is carried out, determines the inspection-pit coordinate position；Well head steel pile casting is buried according to the inspection-pit coordinate position；It uses
Drilling machinery excavates the inspection-pit elevation location on cutter head of shield machine into tunnel；Segmental installation inspection-pit steel pile casting.
Preferably, the internal diameter of the well head steel pile casting is greater than the diameter of the inspection-pit, the top surface of the well head steel pile casting
Absolute altitude is higher than construction ground.
Preferably, in the step S5) in, the hand digging to projected depth forms the inspection-pit, comprising: in machine
The bottom that tool formula excavates the well section to be formed continues a cubic metre of earth hand digging, wherein the every excavation predetermined depth of hand digging, in institute
The borehole wall merogenesis for stating inspection-pit sets up grid steel frame and is laid with mesh sheet, and sprays the grid steel frame and laying mesh sheet
Concrete, up to hand digging to projected depth；It is laid with single layer steel mesh in shaft bottom, forms the inspection-pit.
Preferably, in the cutterhead elevation range corresponding position of hand digging to shield machine, in the borehole wall frame of the inspection-pit
If glass fiber-reinforced polymer structure grid, for guaranteeing that the without hindrance broken wall of shield machine reaches specified maintenance and tool change position.
Shield inspection-pit construction method provided by the invention, by the way that inspection-pit, Neng Goutong are arranged in front of shield machine tunnels
Situations such as maintenance well construction finds out cobble, erratic boulder distribution is crossed, plays the role of exploration hole and provides geology for next step solution formulation
Foundation；Maintenance or cutterhead replacement can be carried out to the shield machine simultaneously, and is capable of providing safe operating environment；It is waited in earth's surface
It excavates inspection-pit surrounding setting grouting sleeve valve pipe and carries out grouting and reinforcing, firm stratum is formed by slip casting, during avoiding excavation
It settles, and the mini pile effect of mini-valve tube is combined to avoid stratum loose, control the inspection-pit and excavate coverage, guarantee
The safety of construction period；It is taken first from earth's surface and mechanically excavates inspection-pit cutter head of shield machine subscript high position into tunnel
It sets, then since on cutter head of shield machine elevation location, forming the inspection-pit using hand digging to projected depth, really in tunnel
It has protected the safety of maintenance well construction and has shortened and built the period；After carrying out maintenance or cutterhead replacement to shield machine, sand is used
Stone backfills the inspection-pit, to guarantee ground safety.
The other feature and advantage of the embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the step flow chart of the shield inspection-pit construction method of embodiment according to the present invention；
Fig. 2 is the top view of the shield machine and inspection-pit of embodiment according to the present invention；
Fig. 3 is the front section view of the shield machine and inspection-pit of embodiment according to the present invention.
Description of symbols
1 inspection-pit, 2 cutter head of shield machine
3 concrete collar tie beams
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the embodiment of the present invention.It should be understood that this
Locate described specific embodiment and be merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
With reference to the accompanying drawing, technical solution in the embodiment of the present invention is described in detail.
Due to excavating, there are cobble, erratic boulders to be distributed in soil layer, damages to the cutterhead of shield machine, or blocking shield machine
Screw machine causes cutterhead stuck stop jumping repeatedly occur, and there are abnormal sounds, dregs to be discharged for cutterhead in driving, and thrust, soil pressure increase
Greatly, situations such as can not normally promoting, needs to carry out cutterhead to replace or overhaul screw machine.
As shown in Figure 1-Figure 3, the present invention provides a kind of shield inspection-pit construction method, and the construction method includes following step
It is rapid: S1) before the construction of inspection-pit 1, in the cast-in-place formation concrete collar tie beam 3 of the pithead position of inspection-pit 1 to be excavated；S2 it) is waited in earth's surface
It excavates 1 surrounding of inspection-pit setting grouting sleeve valve pipe and carries out grouting and reinforcing；S3) in the 1 surrounding tunnel two sides of inspection-pit to be excavated
Excavation forms multiple dewatering wells；S4 it) is taken from earth's surface and mechanically excavates the inspection-pit 12 subscript of cutter head of shield machine into tunnel
High position；S5) since on cutter head of shield machine 2 elevation location, forming the inspection using hand digging to projected depth in tunnel
Well workover 1；S6) after carrying out maintenance or the replacement of cutter head of shield machine 2 to shield machine, the inspection-pit 1 is backfilled using sandstone.
According to the technique and scheme of the present invention, inspection-pit 1 is set in front of shield machine driving, can be constructed by inspection-pit 1
Situations such as finding out cobble, erratic boulder distribution, plays the role of exploration hole and provides geologic basis for next step solution formulation；It simultaneously can
Safety work environment is provided for cutter maintenance, replacement.
Specifically, step S1): before the construction of inspection-pit 1, in the cast-in-place formation concrete of the pithead position of inspection-pit 1 to be excavated
Collar tie beam 3 (as shown in Figure 3)；To ensure that during construction, well head does not collapse, guarantee the safety of construction.
A kind of embodiment according to the present invention, in the step S1) in, the cast-in-place formation concrete collar tie beam 3 include: to
Within the scope of the walling crib for excavating inspection-pit 1, surface dust is removed；It constructs and buries well head casing；Circle is poured close to casing inner wall production
Beam simultaneously arranges built-in fitting in described pour in collar tie beam；It pours collar tie beam to described after removing casing and pour forming the concrete collar tie beam
3.3 sound construction of concrete collar tie beam of overall time pouring molding, is hardly damaged, it can be ensured that the safety of well head construction.
A kind of embodiment according to the present invention, in the step S1) after and before step S2), further includes: to
The well head neighbouring position setting guardrail and water fender of inspection-pit 1 are excavated, to prevent sundries, surface dust and water from falling into the inspection from well head
In well workover 1, the safety of construction personnel and being normally carried out for construction are further ensured.
Due to 1 present position complex geologic conditions of inspection-pit, in order to avoid the security risk of construction period, according to the present invention
Technical solution, step S2): carry out grouting and reinforcing in earth's surface 1 surrounding of inspection-pit to be excavated setting grouting sleeve valve pipe, pass through slip casting
Firm stratum is formed, avoids settling during excavating, and the mini pile effect of mini-valve tube is combined to avoid stratum loose, control
The inspection-pit 1 excavates coverage, guarantees the safety of construction period.
A kind of embodiment according to the present invention, in the step S2) in, in earth's surface 1 surrounding of inspection-pit setting to be excavated
Two circle grouting sleeve valve pipes carry out grouting and reinforcing, and specifically, can select the specification of sleeve valve is Φ 76mm；The grouting sleeve valve pipe
Depth is 0.6~1m of the well head of inspection-pit 1 to be excavated or less, and the depth of mini-valve tube can be selected according to geological condition；Slip casting side
Formula is that rigid mini-valve tube is segmented retrusive slip casting；Injection speed is 10~110L/min；Final grouting pressure is 3~4MPa；Slip casting material
Material uses based on ordinary portland cement single slurry, supplemented by ordinary cement-waterglass dual slurry, single slurry proportion: W:C=(0.8
~1): 1, dual slurry proportion: W:C=(0.8~1): 1, C:S=1:1.
Since the inspection-pit 1 is in sandy gravel composite soil water rich strata, to ensure construction safety, skill according to the present invention
Art scheme, step S3): it excavates to form multiple dewatering wells in the 1 surrounding tunnel two sides of inspection-pit to be excavated, excavates soil to reduce
Water content in layer, prevents the generation of water burst accident.
A kind of embodiment according to the present invention, in the step S3) in, the excavation step of the dewatering well includes: to bore
Hole forms the hoistway that depth is 45m, aperture is 600mm；Installation wall is more than or equal to 3mm in the hoistway, caliber is 280mm's
Well casing；Between the well casing and the hoistway inner wall ring rockfill English circle gravel and ring fill out clay ball, to form the dewatering well.
Specifically, from shaft bottom to 10m pressure-bearing water-bearing section ring rockfill English circle gravel, to form good artificial loaded filter；In 10m
Range inner ring fills out clay ball to carry out sealing of hole outside pipe, upper layer diving is insulated with lower part artesian water, to avoid diving by after drainage
Discharging consolidation causes the excessive sedimentation in ground.
A kind of embodiment according to the present invention, it is preferable that the tube top of well casing 0.2m above ground level, to prevent ground
Water flows into the dewatering well.
To ensure that 1 construction safety of inspection-pit and shortening are built the period, according to the technique and scheme of the present invention, step S4): from ground
Table, which is taken, mechanically excavates the inspection-pit 1 elevation location on cutter head of shield machine 2 into tunnel.
A kind of embodiment according to the present invention, in the step S4) in, it is taken from earth's surface and mechanically excavates the maintenance
Well 1 includes: to carry out construction lofting using total station, determines 1 coordinate position of inspection-pit；According to 1 coordinate bit of inspection-pit
Set embedded well head steel pile casting；The inspection-pit 1 elevation location on cutter head of shield machine 2 into tunnel is excavated using drilling machinery；Point
The embedded inspection-pit steel pile casting of section.
A kind of embodiment according to the present invention carries out construction lofting using total station, determines 1 coordinate bit of inspection-pit
It postpones, a site is made on 1 coordinate position of inspection-pit using the lumps of wood stake of long 30cm, then follow closely iron nail on timber and accurately determine
Position；Stake position is buried fender pile after determining and is protected to stake position, 2~3 meters from stake position of fender pile, is followed closely using right-angled intersection, lumps of wood dowel pin
The method of hanging wire is determined, and uses concreting fender pile in the fender pile bottom margin, so that the fender pile stablizes jail
Gu in order to avoid the fender pile is lost or is loosened.
A kind of embodiment according to the present invention, the internal diameter of the well head steel pile casting are greater than the diameter of the inspection-pit 1, institute
The top surface absolute altitude for stating well head steel pile casting is higher than construction ground.Specifically, the internal diameter of the well head steel pile casting is than the inspection-pit 1
The big 20cm of diameter, casing top surface are higher by construction ground 0.5m.The cylinder s buried depth is met the following requirements: cohesive soil is not less than
1m, sandy soil are not less than 2m；Casing is embedded into harder closely knit soil layer when topsoil is soft and is no less than 0.3m, and
Casing surrounding backfill clay is simultaneously tamped；Casing end face center and design pile position deviation are not more than 5cm, and gradient is not more than 1%, with
Guarantee the quality of shield-tube embedment.
According to the technique and scheme of the present invention, step S5): since in tunnel on cutter head of shield machine 2 elevation location, using people
Work is excavated to projected depth and forms the inspection-pit 1, ensure that the safety of construction.
A kind of embodiment according to the present invention, it is preferable that in the step S5) in, the hand digging is to designing depth
Degree forms the inspection-pit 1, comprising: continue a cubic metre of earth hand digging in the bottom of the mechanical well section excavated and formed, wherein
The every excavation predetermined depth of hand digging sets up grid steel frame in the borehole wall merogenesis of the inspection-pit 1 and is laid with mesh sheet, and to described
Grid steel frame and laying mesh sheet carry out jetting cement, up to hand digging to projected depth；It is laid with single layer steel mesh in shaft bottom, is formed
The inspection-pit 1；It is laid with single layer steel mesh in shaft bottom, for guaranteeing the firm of 1 structure of inspection-pit, guarantees the peace of construction
Entirely.
A kind of embodiment according to the present invention, the predetermined depth is 500mm, to set up grid steel frame and laying in time
Mesh sheet, and to the grid steel frame and it is laid with mesh sheet progress jetting cement, guarantee the safety of construction.
A kind of embodiment according to the present invention, the safety of 1 structure of inspection-pit when to ensure that cutterhead 2 abolishes the borehole wall,
In the 2 elevation range above and below preset distance of cutter head of shield machine, twice concrete ring beam structure, concrete described in twice is respectively set
Sleeper is set between ring beam and is attached the stabilization to ensure 1 structure of the inspection-pit entirety.
A kind of embodiment according to the present invention, it is preferable that corresponding in 2 elevation range of cutterhead of hand digging to shield machine
Position sets up glass fiber-reinforced polymer structure grid in the borehole wall of the inspection-pit 1, for guaranteeing that the without hindrance broken wall arrival of shield machine refers to
Fixed maintenance and tool change position.
The measure for increasing glass fiber-reinforced polymer grid rigidity should be taken in the fiberglass grid manufacturing process, to prevent
Occurring biggish deformation in lifting and transportational process influences the installation of glass fiber-reinforced polymer grid.For example, in stress main reinforcement glass fibers
The connection between muscle and reinforcing bar, between glass fiber-reinforced polymer and glass fiber-reinforced polymer is tieed up to connect using steel U-shaped buckle；Between remaining position
Glass fiber-reinforced polymer muscle and reinforcing bar, glass fiber-reinforced polymer and glass fiber-reinforced polymer between connection can using iron wire bind, binding jail
Gu.
A kind of embodiment according to the present invention excavates position periphery in the inspection-pit 1 and mud pit is arranged, and is the inspection
The construction of well workover 1 provides mud, selects and prepares enough clay for preparing mud or bentonite, move up and down carry out pulping using block stamp.
When needing to carry out the shield machine maintenance or cutterhead 2 is replaced, construction first forms the inspection-pit 1, later
The shield machine is tunneled to the side side wall for abolishing the inspection-pit 1, and construction personnel can be in the inspection-pit 1 to the shield
Structure machine carries out maintenance or cutterhead 2 is replaced, and the inspection-pit 1 provides enough maintenance and replacement space, and construction personnel does not mention
The operating environment of safety is supplied.According to the technique and scheme of the present invention, step S6): maintenance or the replacement of cutterhead 2 are being carried out to shield machine
Afterwards, the inspection-pit 1 is backfilled using sandstone.
One section retaining wall of bottommost need to be removed when backfill, in order to avoid influence the subsequent tunneling construction of shield machine；30cm is used when backfill
One layer, hand compaction, last 2m is using clay backfilling and tamps；It simultaneously will to establish soil pressure flat to carrying out filling out sand in shield machine soil cabin
Weighing apparatus, to guarantee ground safety.
The object of the present invention is to provide a kind of shield inspection-pit construction methods, are overhauled by being arranged in front of shield machine tunnels
Well 1 can be constructed by inspection-pit 1 and find out situations such as cobble, erratic boulder are distributed, and played the role of exploration hole and be next step scheme system
Geologic basis is provided surely；Maintenance can be carried out to the shield machine simultaneously or cutterhead 2 is replaced, and is capable of providing safe operation ring
Border；Grouting and reinforcing is carried out in earth's surface 1 surrounding of inspection-pit setting grouting sleeve valve pipe to be excavated, forms firm stratum by slip casting,
It avoids settling during excavating, and the mini pile effect of mini-valve tube is combined to avoid stratum loose, control the inspection-pit 1 and excavate
Coverage guarantees the safety of construction period；It is taken first from earth's surface and mechanically excavates the shield machine into tunnel of inspection-pit 1
Elevation location on cutterhead 2, then since in tunnel on cutter head of shield machine 2 elevation location, using hand digging to projected depth shape
At the inspection-pit 1, it is ensured that the safety and shorten and build the period that inspection-pit 1 is constructed；To shield machine carry out maintenance or
After cutterhead 2 is replaced, the inspection-pit 1 is backfilled using sandstone, to guarantee ground safety.
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of shield inspection-pit construction method, which is characterized in that the construction method the following steps are included:
S1) before inspection-pit (1) construction, in the cast-in-place formation concrete collar tie beam (3) of the pithead position of inspection-pit to be excavated (1)；
S2) grouting and reinforcing is carried out in earth's surface inspection-pit to be excavated (1) surrounding setting grouting sleeve valve pipe；
S3 it) excavates to form multiple dewatering wells in inspection-pit (1) the surrounding tunnel two sides to be excavated；
S4 it) is taken from earth's surface and mechanically excavates the inspection-pit (1) elevation location on cutter head of shield machine (2) into tunnel；
S5) since elevation location on cutter head of shield machine in tunnel (2), the maintenance is formed using hand digging to projected depth
Well (1)；
S6) after carrying out maintenance or cutter head of shield machine (2) replacement to shield machine, the inspection-pit (1) is returned using sandstone
It fills out.
2. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S1) in, it is described existing
It pours and to form concrete collar tie beam (3) and include:
Within the scope of the walling crib of inspection-pit to be excavated (1), surface dust is removed；
It constructs and buries well head casing；
It pours collar tie beam close to casing inner wall production and arranges built-in fitting in collar tie beam in described pour；
It pours collar tie beam to described after removing casing and pour forming the concrete collar tie beam (3).
3. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S1) after and
Step S2) before, further includes:
In the well head neighbouring position of inspection-pit to be excavated (1), guardrail and water fender are set.
4. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S2) in, in earth's surface
Two circle grouting sleeve valve pipe of inspection-pit (1) surrounding setting to be excavated carries out grouting and reinforcing, and the depth of the grouting sleeve valve pipe is wait dig
Dig 0.6~1m of the well head of inspection-pit (1) or less.
5. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S3) in, the drop
The excavation step of well includes:
Drilling forms the hoistway that depth is 45m, aperture is 600mm；
The well casing that installation wall is more than or equal to 3mm in the hoistway, caliber is 280mm；
Between the well casing and the hoistway inner wall ring rockfill English circle gravel and ring fill out clay ball, to form the dewatering well.
6. shield inspection-pit construction method according to claim 5, which is characterized in that the tube top of the well casing is above ground level
0.2m。
7. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S4) in, from earth's surface
It takes and mechanically excavates the inspection-pit (1) and include:
Construction lofting is carried out using total station, determines the inspection-pit (1) coordinate position；
Well head steel pile casting is buried according to the inspection-pit (1) coordinate position；
The inspection-pit (1) elevation location on cutter head of shield machine (2) into tunnel is excavated using drilling machinery；
Segmental installation inspection-pit steel pile casting.
8. shield inspection-pit construction method according to claim 7, which is characterized in that the internal diameter of the well head steel pile casting is big
The top surface absolute altitude of diameter in the inspection-pit (1), the well head steel pile casting is higher than construction ground.
9. shield inspection-pit construction method according to claim 1, which is characterized in that in the step S5) in, the people
Work is excavated to projected depth and forms the inspection-pit (1), comprising:
Continue a cubic metre of earth hand digging in the bottom of the mechanical well section excavated and formed, wherein hand digging is every excavates pre- depthkeeping
Degree sets up grid steel frame in the borehole wall merogenesis of the inspection-pit (1) and is laid with mesh sheet, and to the grid steel frame and is laid with mesh sheet
Jetting cement is carried out, up to hand digging to projected depth；
It is laid with single layer steel mesh in shaft bottom, forms the inspection-pit (1).
10. shield inspection-pit construction method according to claim 9, which is characterized in that in hand digging to shield machine
Cutterhead (2) elevation range corresponding position sets up glass fiber-reinforced polymer structure grid in the borehole wall, for guaranteeing the without hindrance broken wall of shield machine
Reach specified maintenance and tool change position.
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| CN201910550294.8A CN110284885A (en) | 2019-06-24 | 2019-06-24 | Shield inspection-pit construction method |
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| CN110630273A (en) * | 2019-10-17 | 2019-12-31 | 中铁二局集团有限公司 | Construction method of totally weathered granite ground layer bias shallow tunnel |
| CN111058851A (en) * | 2019-12-06 | 2020-04-24 | 中交第三航务工程局有限公司南京分公司 | Safe construction method for shield cutter head repair space |
| CN112031797A (en) * | 2020-08-03 | 2020-12-04 | 王沛喆 | Shield construction maintenance device |
| CN113982599A (en) * | 2021-10-09 | 2022-01-28 | 中铁七局集团有限公司 | Shield tunneling construction method for underwater cultural relic protection area of water-bearing sand pebble bed |
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