CN109736847A - One-time pouring concrete inverted arch and construction method thereof - Google Patents
One-time pouring concrete inverted arch and construction method thereof Download PDFInfo
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- CN109736847A CN109736847A CN201910116650.5A CN201910116650A CN109736847A CN 109736847 A CN109736847 A CN 109736847A CN 201910116650 A CN201910116650 A CN 201910116650A CN 109736847 A CN109736847 A CN 109736847A
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Abstract
A kind of primary concreting concrete inverted arch and its construction method, until the inverted arch concrete of inverted arch preliminary bracing is the concrete of no concrete boundary and the same label primary concreting of concrete delamination entirety below the inverted arch fill surface of tunnel inverted arch, cancel inverted arch arc formwork when construction and inverted arch sidewall template is only installed, inverted arch end head formwork and Central drain template, inverted arch sidewall template is installed on the preset height of inverted arch two sides abutment wall, the lower end of inverted arch sidewall template is concordant with preset inverted arch fill surface, inverted arch fill surface height of the casting area primary concreting concrete to design in the middle part of to inverted arch, inverted arch concrete is poured into the inverted arch sidewall template of inverted arch two sides abutment wall to preset height.Construction technology of the present invention significantly simplifies, and significantly shortens the construction time, reduces placement layer by layer interface gaps, prevent crevice water frost heave from inverted arch being caused to swell, inverted arch construction quality is effectively increased, engineering cost is saved, the application in constructing tunnel is bound to more and more extensive.
Description
Technical field
The present invention relates to technical field of tunnel construction, specifically a kind of primary concreting concrete inverted arch and its construction party
Method.
Background technique
In current constructing tunnel, inverted arch is that tunnel bottom is arranged in improve tunnel top supporting construction stress condition
Reversed domes, be one of chief component of tunnel structure, on the one hand it leads to the strata pressure on tunnel top
It crosses tunnel side wall structure or the load on road surface is effectively transmitted to underground, but also effectively resist tunnel understratum and pass
The counter-force come.Inverted arch and secondary lining constitute tunnel entirety, increase structural stability.Inverted arch secondary lining is universal at present with filling
Using arc formwork placement layer by layer, the template system after-pouring inverted arch secondary lining of first installation kit bracket template is torn open after maintenance
Except arc formwork carries out the filling of inverted arch face, secondary pour causes interface cohesion defect；Construction technology is cumbersome, when converting between process
Between it is long, extend the duration, it is serious to restrict inverted arch construction speed, cause step pitch exceeded, seriously affect construction safety in tunnel.And this
One way is that current standardization applies program, due to mechanical property can not Scaling and can not reduce die test therefore become
More resistance is big and design fund and manpower are huge, is difficult to have breakthrough all the time.
Summary of the invention
Work is poured the technical problem to be solved by the present invention is to strive for simplification inverted arch secondary lining and inverted arch filling region
Skill shortens the construction period, Optimizing construction quality.
The primary concreting concrete inverted arch, it is characterised in that: tunnel inverted arch from outer layer to tunnel center position according to
It is secondary to be equipped with inverted arch preliminary bracing and inverted arch secondary lining, wherein the inverted arch that the inverted arch top surface in the middle part of inverted arch is horizontal plane is filled
Face, until the inverted arch concrete of inverted arch preliminary bracing is the same of no concrete boundary and concrete delamination below inverted arch fill surface
The concrete of label primary concreting is whole；
Inverted arch secondary lining at the short abutment wall in the two sides of inverted arch is from the setting above inverted arch fill surface to inverted arch fill surface
Highly.
It is horizontal and vertical in the inverted arch concrete of inverted arch preliminary bracing to be embedded with lining cutting reinforcing bar.
The Central drain of insertion inverted arch concrete is longitudinally equipped at the middle part of inverted arch fill surface.
The construction method of primary concreting concrete inverted arch, it is characterised in that: the construction procedure carried out including following sequences:
One, tunnel bottom excavation, clear bottom
Inverted arch excavation is carried out according to design drawing cross-section diagram, inverted arch clears up inverted arch substrate after having excavated out dregs, guarantees to face upward
Skewback bottom is without empty slag；
Two, inverted arch tunnel bottom element sprays concrete
Inverted arch preliminary bracing is applied using gunite concrete excavating in the inverted arch completed；
Three, guarded drainage built-in fitting applies
In two sides, preliminary bracing and inverted arch end are laid with geotextiles, are fixed on geotextiles using nailing and hot melt welding pad
In inverted arch preliminary bracing, fixed and arranged drains blind pipe, inverted arch preliminary bracing and inverted arch in two sides in the short abutment wall geotextiles in two sides
Fitting is laid with waterproof soft board on end, and welding pad firm welding will be heated on waterproof soft board and geotextiles using electromagnetism welding machine；
Four, inverted arch reinforcing bar is bound
Two layers of lining cutting inverted arch reinforcing bar is bound by design requirement, concrete mats are used between lining cutting inverted arch reinforcing bar and waterproof soft board
Block support isolation；
Five, installation template
Cancel inverted arch arc formwork and inverted arch sidewall template, inverted arch end head formwork and Central drain template, inverted arch side are only installed
Wall form is installed on the preset height of inverted arch two sides abutment wall, and the lower end of inverted arch sidewall template is concordant with preset inverted arch fill surface；
In the two sides installation center ditch template of Central drain, inverted arch end head formwork is installed in the rear and front end of inverted arch；Blind pipe will be drained
It docks, and blocks with the drain hole of inverted arch sidewall template, prevent concrete from leaking；
Six, waterstop is installed
Template longitudinal construction joint arrangement in buried water stop, inverted arch end circular construction joint arrangement in buried sealing
Band, back-adhering waterstop, inverted arch two sides abutment wall longitudinal direction waterstop are fixed using holding clamp；
Seven, inverted arch concreting
Inverted arch fill surface height of the filling region primary concreting inverted arch fill concrete to design, Xiang Yang in the middle part of to inverted arch
Encircle and is poured inverted arch concrete in the inverted arch sidewall template of two sides abutment wall to preset height；
Eight, form removal, inverted arch concrete curing
After the completion of inverted arch filling, intensity removes inverted arch template when reaching 8Mpa, after inverted arch form removable, in time to concrete
Sprinkling maintenance guarantees that concrete surface is in moisture state.
5. construction method according to claim 4, it is characterised in that: in step 7, inverted arch fill concrete mark
It number uses inverted arch concrete ad eundem concrete, to filling region primary concreting inverted arch region in the middle part of inverted arch and faces upward first
Encircle filling region, backward inverted arch two sides abutment wall inverted arch sidewall template in casting inverted arch concrete, using internal vibration stick,
Vertical vibration compacting.
Primary concreting is filled according to using inverted arch secondary lining and inverted arch, construction technology is significantly simplified, it is significant to shorten
Construction time, while the combination problem between inverted arch secondary lining and inverted arch filling is eliminated, effectively increase inverted arch construction
Quality, and construction efficiency is improved, construction speed is accelerated, engineering cost is saved, the application in constructing tunnel certainly will be more next
It is more extensive.
Detailed description of the invention
Fig. 1 is the unshaded section structure diagram of the present invention,
Fig. 2 is section structure diagram of the present invention.
In figure: 1- inverted arch preliminary bracing, 2- geotextiles, 3- drain blind pipe, 4- waterproof soft board, 5- lining cutting reinforcing bar, 6- inverted arch
Sidewall template, 7- waterstop, 8- inverted arch concrete, the short abutment wall of 9- inverted arch, 10- inverted arch fill surface, 11- internal rail top surface, the center 12-
Ditch, 13- Central drain template, 14- inverted arch fill concrete.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples: tunnel tunnel face as shown in Figure 2, outermost layer are
Inverted arch preliminary bracing 1 starts at the short abutment wall 9 of lower part two sides inverted arch as inverted arch secondary lining made of being poured as inverted arch concrete eight,
It is inverted arch fill concrete 14 at the middle part of lower part, inverted arch secondary lining refers exclusively to inside along inverted arch preliminary bracing 1 in the prior art
The one layer of strengthening supporting layer uniformly poured buries reinforcing bar and is mounted with a full set of closed template, inside including the inverted arch in the middle part of inverted arch
After arc formwork, the concrete that high grade C50 usually can be used is perfused from the window of template, and inverted arch mould is removed after perfusion
Plate, installation center ditch template, inverted arch filling region is poured using low-grade concrete again, is applied step by step and arc formwork
Assembly and disassembly need to expend a large amount of durations, and secondary pour reduces inverted arch safety, be easy to cause gap pouring interface, causes swollen
Swollen coefficient is different, in conjunction with shakiness.
The concreting of inverted arch is once completed in the present invention, is seen in structure, inverted arch concrete and inverted arch fill coagulation
Native casting area is integrated, and eliminates the boundary of inverted arch secondary lining and inverted arch filling region, and inverted arch concrete and inverted arch are filled out
It fills concrete and uses same concrete grade, one-time-concreting, inverted arch secondary lining and inverted arch filling region are integrated, not only
The production, transport, installation and removal process of the arc formwork of large area is omitted, and avoids inverted arch secondary lining and inverted arch
The filling region coefficient of expansion is different and combines bring negative effect built on the sand.
Inverted arch secondary lining at the short abutment wall in the two sides of inverted arch is higher by inverted arch fill surface, highly applies according to design requirement
Work above inverted arch fill surface, plays the role of strengthening supporting in embodiment.
The draining blind pipe of tunnel two sides is embedded in inverted arch fill area, is opened on Central drain 12, and Central drain 12 is embedded at
The middle part of inverted arch fill area, and top surface opening protrudes from inverted arch fill surface 10.Inverted arch secondary lining is laid with two layers of steel in region
Muscle layer, in embodiment, according to design requirement, outer reinforcement, which is laid with, retains 5.5cm protective layer thickness with inverted arch preliminary bracing face,
Internal layer reinforcing bar, which is laid with, retains 5.5cm protective layer thickness with the inverted arch secondary lining surface of two sides, and ectonexine bar-spacing set is by design
It is required that arrangement, can keep spacing consistent.
Construction method to construct embodiment specifically to illustrate primary concreting concrete inverted arch below:
Sequence carries out following step construction:
1, tunnel bottom excavation, clear bottom
Inverted arch excavation is carried out according to design drawing cross-section diagram, inverted arch clears up inverted arch substrate after having excavated out dregs, guarantees to face upward
Skewback bottom is without empty slag.
2, it measures
After inverted arch excavates and clear up empty slag, the timely repetition measurement of teams and groups is measured, deficient digging is judged whether there is, owes to dig if it exists, after
It is continuous to excavate and clear up empty slag, guarantee that inverted arch excavation meets design requirement.
3, inverted arch tunnel bottom element sprays concrete
After measurement review is qualified, inverted arch substrate applies preliminary bracing in time, as embodiment, the first Zhi Caiyong wet shot of inverted arch
C25 gunite concrete, thickness 10cm.
4, guarded drainage built-in fitting applies
Waterproof soft board, blind pipe installation
Geotextiles are carried out according to design drawing and waterproof soft board applies, and in two sides, preliminary bracing and inverted arch end are laid with geotechnique
Cloth 2, using the fixed draining blind pipe 3 of the circumferential adhesive tape for playing the role of fixed drainpipe in geotextiles 2, in two sides preliminary bracing and
Inverted arch end is laid with waterproof soft board 4, will heat welding pad on splash guard 4 and geotextiles 2 using electromagnetism welding machine, heats washer arch
By the vertical arrangement of 50cm ring * 80cm, abutment wall is by the vertical arrangement of 80cm ring * 100cm ring, in a certain Specific construction embodiment, geotextiles
According to design lap of splice 5cm hang, with hot melt gasket together with as at the beginning of nailing is fixed on inverted arch branch face, the waterproof soft board lap of splice
15cm, weld width 1.5cm are welded and fixed by heating gasket.
The gutter of tunnel longitudinally disposed two sides and center, after waterproof soft board, geotextiles are fixed, in the short abutment wall geotechnique in two sides
Arrangement draining blind pipe 3 is bowed out at inverted arch both ends according to 135 degree of angles outward using the longitudinal direction 100cm blind pipe on cloth.Every plate inverted arch
One group of circle draining blind pipe of installing, using 50cm Water penetrative flexible pipe.Every plate inverted arch arranges drain hole four, is spaced 6 meters.By arch and
The infiltration of abutment wall introduces gutter on the inside of short abutment wall by ring direction drainpipe, longitudinal drainage pipe, is drawn by drainage bases drainpipe
Enter Central drain, water is drained into outside hole
Installation of embedded parts
In inverted arch paragraph mileage if it exists transformer pit, big refuge chamber, big refuge chamber and repeater etc. determine whether it is pre-
Buried rail pipeline.In addition, the every 30 meters of pre-buried transverse drains of inverted arch spacing.
5, reinforcing bar is prefabricated
Preprocessing is carried out to inverted arch reinforcing bar according to design drawing, reinforcing bar length needed for determining in advance simultaneously carries out inverted arch reinforcing bar
Pre-bending.
6, assembling reinforcement
Reinforcing bar binding is carried out as requested according to design drawing, and in the particular embodiment, main reinforcement uses 18 screw-thread steel of Ф
Muscle, spacing 20cm, distributing reinforcement use 10 round steel of Ф, and spacing 25cm hooks muscle and uses 6 round steel of Ф, is arranged in each reinforcing bar crosspoint.
It is isolated between inverted arch reinforcing bar 5 and splash guard 4 using concrete pad support, to ensure inverted arch lining cutting reinforced concrete protective layer.
Inverted arch upper layer and lower layer reinforcing bar interlamellar spacing 35.5cm, protective layer thickness 5.5cm.Main reinforcement protruded length is respectively 126cm and 63cm, is taken
Spreading degree 63cm.Cushion block is bound in reinforcing bar process of binding as requested, every square meter requires no less than 4.
7, ditch template, end head formwork, waterstop are installed
The installation of inverted arch template and waterstop is carried out after the completion of the binding of inverted arch reinforcing bar.First put by measuring teams and groups scene
Sample determines the fixed position of template, guarantees that concrete thickness meets the requirements and not encroachment line.
Installation inverted arch sidewall template, inverted arch end head formwork, Central drain template 6, cancellation inverted arch arc formwork, that is,
Inverted arch sidewall template lower end is not provided with template, and inverted arch sidewall template lower end is inverted arch fill surface height.In the front end of inverted arch with after
End installation inverted arch end head formwork.The lateral surface installation center ditch template 6 of Central drain.Continuously splice between adjacent template, faces upward
Arch sidewall template face is set as inverted arch surface design position, substantially parallel with inverted arch preliminary bracing face, after installation is fixed, prevents from mixing
Solidifying soil runs mould leakage.
Buried steel side waterstop one in longitudinal construction joint arrangement, buried rubber fastening band, back in circular construction joint arrangement
Each one of mounted rubber fastening band.It is centrally arranged, the exposed lap of splice is no less than 50cm.Waterstop 7 is adopted with inverted arch end head formwork 6
It is fixed with sizing.Waterstop plays the role of concrete seam waterproof, and waterstop is divided into two sides abutment wall buried water strip and faces upward
Circumferential direction buries waterstop in arch abutment head, and inverted arch two sides abutment wall longitudinal direction waterstop is fixed using holding clamp
8, concrete mixing
Charger sheet is provided according to laboratory, mixing inverted arch concrete is unified by blending station.
9, concrete transportation
Blending station is transported from blending station to construction site after completing concrete mixing by concrete delivery truck.
10, inverted arch concreting
Live inverted arch once-cast, using inverted arch trestle primary concreting inverted arch concrete eight and inverted arch fill concrete
14, inverted arch filling is vibrated when pouring, and using plug-in type vibrating stick, when shifting one's position, vertically should slowly be extracted, vibration compacting,
It must not put down and drag in concrete pouring bin, it must not collision slab, reinforcing bar and built-in fitting.Inverted arch concrete height control with inverted arch
Fill surface is mutually neat, and inverted arch fill concrete uses ad eundem concrete, and the receipts face at the top of inverted arch is paid attention to after pouring, is marked
Height control, it is ensured that inverted arch filling surface evenness and absolute altitude meet design requirement.
It can synchronize and pour or preferentially pour inverted arch filling region, it can also be disposable to casting area in the middle part of inverted arch first
Pour inverted arch region and inverted arch filling region, backward inverted arch two sides abutment wall inverted arch sidewall template in be poured inverted arch concrete.
11, after the completion of inverted arch filling, inverted arch template can be removed when intensity reaches 8MPa, after inverted arch form removable, demoulding
Afterwards, concrete is conserved in time, guarantees that concrete surface is in moisture state.Temperature forbids sprinkling maintenance when being lower than 5 DEG C.
Claims (5)
1. a kind of primary concreting concrete inverted arch, it is characterised in that: tunnel inverted arch is successively set from outer layer to tunnel center position
There are inverted arch preliminary bracing (1) and inverted arch secondary lining, wherein the inverted arch top surface in the middle part of inverted arch is the inverted arch fill surface of horizontal plane
(10), until the inverted arch concrete (8) of inverted arch preliminary bracing (1) is no concrete boundary and coagulation below inverted arch fill surface (10)
The concrete of the same label primary concreting of soil layering is whole；
Inverted arch secondary lining at the short abutment wall in the two sides of inverted arch is from the setting above inverted arch fill surface (10) to inverted arch fill surface
Highly.
2. concrete inverted arch according to claim 1, it is characterised in that: in the inverted arch concrete of inverted arch preliminary bracing (1)
(8) horizontal and vertical in be embedded with lining cutting reinforcing bar (5).
3. concrete inverted arch according to claim 1, it is characterised in that: be longitudinally equipped at the middle part of inverted arch fill surface (10)
It is embedded in the Central drain (12) of inverted arch concrete (8).
4. a kind of construction method of primary concreting concrete inverted arch, it is characterised in that: the construction step carried out including following sequences
It is rapid:
One, tunnel bottom excavation, clear bottom
Inverted arch excavation is carried out according to design drawing cross-section diagram, inverted arch clears up inverted arch substrate after having excavated out dregs, guarantees inverted arch base
Bottom is without empty slag；
Two, inverted arch tunnel bottom element sprays concrete
Inverted arch preliminary bracing (1) is applied using gunite concrete excavating in the inverted arch completed；
Three, guarded drainage built-in fitting applies
In two sides, preliminary bracing and inverted arch end are laid with geotextiles (2), using nailing and hot melt welding pad that geotextiles (2) are fixed
On inverted arch preliminary bracing (1), fixed and arranged draining blind pipe (3) in the short abutment wall geotextiles in two sides, in two sides inverted arch initial stage branch
It protects fitting on (1) and inverted arch end and is laid with waterproof soft board (4), it will be hot on waterproof soft board (4) and geotextiles (2) using electromagnetism welding machine
Melting welding gasket firm welding；
Four, inverted arch reinforcing bar is bound
Two layers of lining cutting inverted arch reinforcing bar (5) is bound by design requirement, using mixed between lining cutting inverted arch reinforcing bar (5) and waterproof soft board (4)
Solidifying soil cushion block support isolation；
Five, installation template
Cancel inverted arch arc formwork and inverted arch sidewall template (6), inverted arch end head formwork and Central drain template (13), inverted arch are only installed
Sidewall template (6) is installed on the preset height of inverted arch two sides abutment wall, and the lower end of inverted arch sidewall template (6) and preset inverted arch are filled
Face (10) is concordant；In the two sides installation center ditch template (13) of Central drain (12), inverted arch is installed in the rear and front end of inverted arch
End head formwork；Draining blind pipe (3) is docked with the drain hole of inverted arch sidewall template (6), and is blocked, prevents concrete from leaking；
Six, waterstop is installed
Template longitudinal construction joint arrangement in buried water stop, inverted arch end circular construction joint arrangement in buried water stop, back
Pasting type waterstop, inverted arch two sides abutment wall longitudinal direction waterstop are fixed using holding clamp；
Seven, inverted arch concreting
Filling region primary concreting inverted arch fill concrete (14) arrives inverted arch fill surface (10) height of design in the middle part of to inverted arch,
Into the inverted arch sidewall template (6) of inverted arch two sides abutment wall, preset height is arrived in casting inverted arch concrete (8)；
Eight, form removal, inverted arch concrete curing
After the completion of inverted arch filling, intensity removes inverted arch template when reaching 8Mpa, after inverted arch form removable, sprinkles water in time to concrete
Maintenance guarantees that concrete surface is in moisture state.
5. construction method according to claim 4, it is characterised in that: in step 7, inverted arch fill concrete label is adopted
With inverted arch concrete ad eundem concrete, filled out first to filling region primary concreting inverted arch region in the middle part of inverted arch and inverted arch
Fill region, backward inverted arch two sides abutment wall inverted arch sidewall template (6) in be poured inverted arch concrete (8), using internal vibration
Stick, vertical vibration compacting.
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| CN110593902A (en) * | 2019-09-25 | 2019-12-20 | 中铁隧道集团三处有限公司 | Construction method for filling inverted arch and integrally pouring |
| CN110685719A (en) * | 2019-10-31 | 2020-01-14 | 中铁建大桥工程局集团第五工程有限公司 | Quick construction method for double-span simply-supported inverted arch trestle |
| CN111335915A (en) * | 2019-12-27 | 2020-06-26 | 山西省交通科技研发有限公司 | Section steel supporting structure and method for repairing damage of tunnel inverted arch crown |
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| CN111472812A (en) * | 2020-04-24 | 2020-07-31 | 重庆交通建设(集团)有限责任公司 | Construction method for filling and pouring concrete into inverted arch of tunnel |
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Application publication date: 20190510 |