CN107191206A - A kind of step construction method of Shallow-buried Large-span Tunnel Unit two six - Google Patents
A kind of step construction method of Shallow-buried Large-span Tunnel Unit two six Download PDFInfo
- Publication number
- CN107191206A CN107191206A CN201710486125.3A CN201710486125A CN107191206A CN 107191206 A CN107191206 A CN 107191206A CN 201710486125 A CN201710486125 A CN 201710486125A CN 107191206 A CN107191206 A CN 107191206A
- Authority
- CN
- China
- Prior art keywords
- excavation
- unit
- concrete
- tunnel
- top bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims abstract description 69
- 238000009412 basement excavation Methods 0.000 claims abstract description 60
- 239000004567 concrete Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 10
- 238000007363 ring formation reaction Methods 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 238000012407 engineering method Methods 0.000 abstract description 14
- 238000003860 storage Methods 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 description 8
- 239000011435 rock Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 239000010438 granite Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000611 regression analysis Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to technical field of tunnel construction, specifically a kind of step construction method of Shallow-buried Large-span Tunnel Unit two six, solve lack in the regional soft layer constructing tunnel of existing full water a kind of technique it is simple, while can be played in constructing tunnel it is certain separate and support action engineering method the problem of, including excavate upper unit top bar and apply preliminary bracing；Unit is got out of a predicament or an embarrassing situation and applies preliminary bracing on excavation；Crossbeam is installed in the separated place of upper cell cube and lower unit body and concrete median septum is applied；Scaffold is installed on median septum；Excavate lower unit top bar and apply preliminary bracing；Excavate and apply inverted arch and inverted arch filling, complete the closing cyclization of face.Reservoir water storage seepage flow is effectively prevented using this engineering method using engineering method of the present invention, reservoir surrounding enviroment had both been protected, construction safety is in turn ensured that, and construction need not put into special installation, construction quality meets structural requirement, simple operation, with stronger generalization.
Description
Technical field
The present invention relates to technical field of tunnel construction, specifically a kind of step construction method of Shallow-buried Large-span Tunnel Unit two six.
Background technology
The tunnel of various geomorphic types is inevitably run into railway engineering, wherein difficulty of construction is with soft stratum
Large cross-section tunnel is protruded the most.With social progress and the continuous renewal of Building technology, for applying for being used in large cross-section tunnel
Work engineering method has arc leading pit provided core soil method, CD methods, CRD methods, single side heading method, two side-wall pilot tunnel, the step of three step seven
The maturation process such as excavating load.
When tunnel inevitably needs guiding through the underground engineerings such as the similar reservoir such as abundant water, features as poor geologic condition, it is applied
Work security risk is big, is also easy to produce large deformation, easily occurs the accidents such as landslide.Worn under tunnel in reservoir construction, emphasis is to country rock
Content carries out control in terms of sealing, constructing tunnel and guarded drainage, monitoring measurement, supporting in construction especially to tunnel and fast
Speed closing cyclization etc. proposes higher requirement.
At present, soil, the rock combination surface construction for water of satisfying can not ensure the saturation soil body caving in along water base scar of satisfying, therefore often
Constructed using CRD methods, that is, intersect middle-wall method construction, it is a kind of method for tunnel construction suitable for soft stratum, it is special
It is not to have good effect for control subsidence, is typically mainly used in the construction of urban subway.It is reserved using CRD methods
The method of Core Soil, is divided into 4 relatively independent branches of small cavities by large cross-section tunnel and constructs.CRD engineering methods follow " small branch,
Short step, short circulation, fast closing, it is diligent measure, strong supporting " construction principle, from top to bottom, piecemeal cyclization, with digging with support, in time
Carry out preliminary bracing.And after the Vault settlement of preliminary bracing structure and convergence are basicly stable, preliminary bracing is removed from top to bottom
Interim median septum wall and interim inverted arch in structure, then constructed.The applicable span of excavating of CRD methods is larger, and country rock is settled and become
Shape control is strict, is excavated using CRD methods, and all each self-enclosed cyclization of each step of excavation has benching tunnelling method and two side-wall pilot tunnel concurrently
Advantage, be conducive to adjoining rock stability, it is ensured that construction safety.But although CRD engineering methods can be good at ensureing the safety support in tunnel
And excavation quality, but its construction cost is higher, progress is slow；Tunnel construction tunnel face divide into four by CRD engineering methods simultaneously
Relatively independent cavity, easily disturbs country rock during removing partition wall, dividing plate in the later stage, is unfavorable for the steady of tunnel structure repeatedly
It is fixed.
Patent CN104314571A discloses a kind of construction method of the ultrashort step of the step of three step six of large cross-section tunnel, bag
Include following steps：1st, once it is divided into Part I, Part II, Part III and the 4th by the cross section in tunnel is again high to Low
Point, then Part I is excavated, then once apply advance support and the preliminary bracing of Part I barrel structure；2nd, when first
Point be excavated to the excavation of progress Part II after N meter, and extend steelframe, then apply Part II barrel structure preliminary bracing and
Interim inverted arch supporting, then excavates Part III, and apply the preliminary bracing of Part III barrel structure；3rd, the 4th is excavated
Point, and the preliminary bracing of Part IV barrel structure is applied, then the inverted arch of barrel is applied in preset time, apply arch in barrel
Wall two is served as a contrast；4th, the excavation in the completion of repeat step 1,2,3 tunnel enters hole.From the point of view of content, this patent of invention merely illustrates one kind
Six Steps construction concept ideally, technological core is identical with the step excavating load of three step seven, it is to avoid the later stage remove dividing plate,
Repeatedly disturbance of the partition wall to tunnel surrounding, but its engineering method is not bound with specific condition of construction, if can not be done within the section time
To the quick closure cyclization in tunnel, there is great potential safety hazard.
It can be seen that, a kind of engineering method that can have not only reduced construction procedure but also certain separation and support action can be played in constructing tunnel
There is great directive significance for the soft layer constructing tunnel in water area of satisfying.
The content of the invention
The present invention in order to solve to lack in the regional soft layer constructing tunnel of existing full water a kind of technique it is simple, while can
There is provided a kind of unit six of Shallow-buried Large-span Tunnel two for the problem of necessarily engineering method of separation and support action is played in constructing tunnel
Walk construction method.
This engineering method wears reservoir, river under being applied to, tunnel geology condition is poor, the public affairs that water content deforms greatly, easily, caved in
Road, railway tunnel construction.The present invention is achieved through the following technical solutions：A kind of step of Shallow-buried Large-span Tunnel Unit two six construction
Method, is that along its cross-section radial tunnel is divided into two construction sections of upper cell cube and lower unit body from top to bottom, completes construction
After preparation, surveying and locating, tunnel lead pipe-shed support process, tunnel is excavated and supporting construction, upper cell cube includes upper
Unit top bar and upper unit are got out of a predicament or an embarrassing situation, and lower unit body includes lower unit top bar and inverted arch and inverted arch filling, its construction method
Comprise the following steps：
Unit top bar and preliminary bracing is applied on S1, excavation；
Unit is got out of a predicament or an embarrassing situation and applies preliminary bracing on S2, excavation；
S3, crossbeam is installed in the separated place of upper cell cube and lower unit body and concrete median septum is applied；
S4, scaffold is installed on median septum；
S5, excavation lower unit top bar simultaneously apply preliminary bracing；
S6, excavate and apply inverted arch and inverted arch filling, complete face closing cyclization.
Cross construction is carried out according to above-mentioned steps, until tunnel excavation support is completed, also can be in excavation supporting a to fixed length
Second Lining Construction is closelyed follow after degree.
Unit top bar on step S1 excavations, arc leading pit provided core soil method is excavated using ring, and Core Soil length is same
Upper unit top bar length is consistent, and ensures length no more than 3m, and width is the 1/3 ~ 1/2 of excavation width；Upper unit top bar
Excavate ratio of rise to span to be not less than after 0.3, excavation first by pneumatically placed concrete at the beginning of excavation face, top bar steelframe is further installed, and hung
Net and concrete spray closing again.
Unit is got out of a predicament or an embarrassing situation on step S2 excavations, is symmetrically excavated using the left and right sides, after excavation immediately just pneumatically placed concrete, enter one
Walk and top bar steelframe is installed, and carry out linked network and concrete and spray closing again.
Step S3 installs horizontal when upper unit gets out of a predicament or an embarrassing situation length more than 3m in the separated place of upper cell cube and lower unit body
Beam, crossbeam with supporting reinforcing bar is fixed using I-steel and by spacer bar, further formwork and casting concrete median septum, is entered
One step excavates upper unit top bar Core Soil, and concrete median septum includes crossbeam and concrete slab.The effect of median septum is to realize
The small range in tunnel is divided, and is conducive to face small range quick closure cyclization, while also serving as the construction operation of excavation mechinery
Platform.
Step S4 installs scaffold on median septum, refers to after median septum concrete final set, along upper cell cube lubrication groove
The interim work steel arch-shelf of profile surface installation, 3 meters of work steel arch-shelf spacing, arch springing is fixed by bolts on median septum.
Step S5 excavate lower unit top bar, symmetrically excavated using the left and right sides, after excavation immediately just pneumatically placed concrete, enter one
Walk and lower unit top bar steelframe is installed, and carry out linked network and concrete and spray closing again.
Step S6 is excavated and is applied inverted arch and inverted arch filling refers to, treats that lower unit top bar length is more than 3m and less than 5m
When, inverted arch is excavated, inverted arch is of length no more than 3m/ time, it is timely after excavation to apply inverted arch preliminary bracing, and pour inverted arch and inverted arch is filled out
Fill.
Preferably, steelframe is in its steelframe foot position, up 30 ~ 50cm highly, is close to the side of steelframe two and is angled downward
30 ° set lock pin anchor tube, lock the long 4.5m of pin anchor tube, and with steelframe firm welding.
Preferably, crossbeam will be set parallel to face, median septum need to ensure that its concrete cover is not less than 5cm,
Median septum bottom will keep smooth, median septum length is 5~10 meters.
Preferably, just pneumatically placed concrete and concrete spray closing using manipulator concrete injection device progress wet shot again
Operation.
The present invention is had the advantage that with beneficial effect：
Reservoir water storage seepage flow is effectively prevented using this engineering method, reservoir surrounding enviroment had both been protected, and had in turn ensured that construction safety,
Constructed using this engineering method, working space is big, it is possible to achieve construction equipment parallel operations, work efficiency is high, compared with CD, CRD method, has
Gib is few, the advantage, the average gib cost that more than 4000 yuan is saved per linear meter(lin.m.) such as construction speed is fast.Utilize work of the present invention
Method is constructed, and without putting into special installation, construction quality meets structural requirement, simple operation, with stronger generalization.
Brief description of the drawings
Fig. 1 is the process chart of the step construction method of Unit two six of the invention；
Fig. 2 is excavation structural representation of the invention；
Fig. 3 is the structural representation of upper cell cube；
Fig. 4 is the structural representation of lower unit body.
In figure：The upper cell cubes of I-, II- lower unit bodies, the upper unit top bars of 1-, the upper units of 2- are got out of a predicament or an embarrassing situation, 3- median septums, 4-
Scaffold, 5- lower unit top bars, 6- inverted arch and inverted arch filling, A- Shed-pipe Advanced Supports, B- Core Soils, C- crossbeams, D- concrete
Plate.
Embodiment
With reference to Fig. 1-Fig. 4, the present invention will be further described, a kind of step construction method of Shallow-buried Large-span Tunnel Unit two six,
It is that tunnel along its cross-section radial is divided into two construction sections of upper cell cube I and lower unit body II from top to bottom, it is accurate completing construction
After standby, surveying and locating, tunnel Shed-pipe Advanced Support A supporting processes, tunnel is excavated and supporting construction, upper cell cube I includes upper
Unit top bar 1 and upper unit get out of a predicament or an embarrassing situation 2, and lower unit body II includes lower unit top bar 5 and inverted arch and inverted arch filling 6, and it is applied
Work method comprises the following steps：
Unit top bar 1 and preliminary bracing is applied on S1, excavation；
Unit, which is got out of a predicament or an embarrassing situation, on S2, excavation 2 and applies preliminary bracing；
S3, crossbeam C is installed in upper cell cube I and lower unit body II separated place and concrete median septum 3 is applied；
S4, the installation scaffold 4 on median septum 3；
S5, excavation lower unit top bar 5 simultaneously apply preliminary bracing；
S6, excavate and apply inverted arch and inverted arch filling 6, complete face closing cyclization.
Cross construction is carried out according to above-mentioned steps, until tunnel excavation support is completed, also can be in excavation supporting a to fixed length
Second Lining Construction is closelyed follow after degree.
Unit top bar 1 on step S1 excavations, arc leading pit provided core soil method, Core Soil B length are excavated using ring
Ibid the length of unit top bar 1 is consistent, and ensures length no more than 3m, and width is the 1/3 ~ 1/2 of excavation width；Upper unit is appeared on the stage
Rank 1 is excavated ratio of rise to span and is not less than after 0.3, excavation first by pneumatically placed concrete at the beginning of excavation face, further installs top bar steelframe, and carry out
Linked network and concrete spray closing again.Unit gets out of a predicament or an embarrassing situation 2 on step S2 excavations, is symmetrically excavated using the left and right sides, after excavation immediately
First pneumatically placed concrete, further installs top bar steelframe, and carries out linked network and concrete and spray closing again.Step S3 treats that unit is left office
When the length of rank 2 is more than 3m, and I-steel is used simultaneously in upper cell cube I and lower unit body II separated place installation crossbeam C, crossbeam C
Fixed by spacer bar with supporting reinforcing bar, further formwork and casting concrete median septum 3.Step S4 pacifies on median septum 3
Scaffold 4 is filled, is referred to after the concrete final set of median septum 3, interim work steel arch-shelf is installed along upper cell cube I lubrication grooves profile surface,
3 meters of work steel arch-shelf spacing, arch springing is fixed by bolts on median septum 3.Step S5 excavates lower unit top bar 5, using left and right two
Side is symmetrically excavated, first pneumatically placed concrete, the further steelframe of installation lower unit top bar 5, and carry out linked network and coagulation immediately after excavation
Native multiple spray closing.Step S6 is excavated and is applied inverted arch and inverted arch filling 6 refers to, treats that the length of lower unit top bar 5 is more than 3m and small
When 5m, excavate inverted arch, inverted arch is of length no more than 3m/ time, apply inverted arch preliminary bracing after excavation in time, and pour inverted arch with and
Arch filling 6.Steelframe is close to the side of steelframe two and is angled downward 30 ° to set lock pin in its steelframe foot position up 30 ~ 50cm height
Anchor tube, lock the long 4.5m of pin anchor tube, and with steelframe firm welding.Crossbeam C will be set parallel to face, and median septum 3 need to ensure it
Concrete cover is not less than 5cm, and the bottom of median septum 3 will keep smooth, and the length of median septum 3 is 5~10 meters.First pneumatically placed concrete and
Concrete sprays closing and carries out wet shot operation using manipulator concrete injection device again.
Embodiment：Tall building depth railway plum forests tunnel is all fronts main projects, under mileage DK499+100~DK499+170 sections
Chuan Shui footpaths reservoir, this section of buried depth 11m, geological conditions is from top to down：Silty clay, completely weathered granite, strong weathered granite,
Arch is silty clay, and tunnel bottom, in strong weathered granite, is one of plum forests tunnel construction security risk point.Adopted before tunnel excavation
Steel tube shed fracture grouting is used, fan-shaped protection blocking water ring together is formed, prevents reservoir water storage seepage flow, jeopardize tunnel structure safety；Root
According to geological conditions feature, using two unit excavating loads, i.e., excavation face is divided into two cell cubes, upper cell cube I and lower unit body
II, suppresses country rock convergence and sedimentation and deformation, and then protect blocking water ring not to be destroyed using median septum 3 plus scaffold 4.
Constructed in the range of 120 ° of tunnel cross-section arch the super-front large pipe sheds of Ф 89, pipe canopy 10m/ rings, longitudinal pitch 7m, ring
Spacing 0.8m.Shed-pipe Advanced Support A is numbered, odd numbers pipe slip casting, even numbers pipe mends slurry.Dual slurry cement and silicate ratio 1:0.5, it is single
The slurry ratio of mud 1:1, final grouting pressure is controlled in 3.5MPa.Slip casting starts first to block using dual slurry, then carries out single slurry pressure injection,
Expand range of scatter.If single fluid grouting was carried out after a period of time, pressure is not lifted, and dual slurry processing is carried out again.Dual slurry
Gelling time is controlled in 5min or so, and slip casting fills steel pipe after terminating with M7.5 cement mortar.
Unit top bar 1 on excavation, arc leading pit provided core soil method is excavated using ring, and Core Soil B length is ibid single
First length of top bar 1 is consistent, and ensures length no more than 3m, and width is the 1/3 ~ 1/2 of excavation width；Upper unit top bar 1 is opened
Dig ratio of rise to span to be not less than after 0.3, excavation first by pneumatically placed concrete at the beginning of excavation face, top bar steelframe is further installed, and carry out linked network
Spray closing again with concrete.Ф is set more than steelframe pin at 30~50cm height, being close to steelframe both sides edge and be angled downward 30 °
50 lock pin anchor tubes, lock the long 4.5m of pin anchor tube, with steelframe firm welding.
Unit gets out of a predicament or an embarrassing situation 2 on excavation, is symmetrically excavated using the left and right sides, first pneumatically placed concrete immediately after excavation, further peace
Step steelframe is loaded onto, and carries out linked network and concrete and sprays closing again.More than steelframe pin at 30~50cm height, it is being close to steelframe two
Side sets the lock pin anchor tubes of Ф 50 along being angled downward 30 °, the long 4.5m of pin anchor tube is locked, with steelframe firm welding.
When upper unit gets out of a predicament or an embarrassing situation 2 length more than 3m, and crossbeam is installed in upper cell cube I and lower unit body II separated place
C, crossbeam C with supporting reinforcing bar are fixed using I-steel and by spacer bar, further formwork and casting concrete median septum 3,
The length of median septum 3 is 8 meters.Wherein, it is connected with, is longitudinally connected with reinforcing bar per between Pin crossbeams C between crossbeam C and first branch steelframe
Connect, then pour the thick C25 concrete of 30cm.
After the concrete final set of median septum 3, along first branch lubrication groove profile surface erector steel I18 scaffolds 4, between scaffold 4
Away from 3 meters, arch springing is fixed by bolts in the concrete of median septum 3, and is fixed on one with spacer bar and first branch reinforcing bar every 3 meters
Rise, wherein the first branch face 30cm of spacer bar implantation.
Lower unit top bar 5 is excavated, is symmetrically excavated using the left and right sides, first pneumatically placed concrete immediately after excavation, further peace
The steelframe of unit top bar 5 is loaded, and carries out linked network and concrete and sprays closing again.
When the length of lower unit top bar 5 is more than 3m and is less than 5m, inverted arch is excavated, inverted arch is of length no more than 3m/ times, excavated
Apply inverted arch preliminary bracing in time afterwards, and pour inverted arch and and arch filling 6.
Cross construction is carried out according to above-mentioned steps, until tunnel excavation support is completed, also can be in excavation supporting a to fixed length
Second Lining Construction is closelyed follow after degree.
It should be noted that：
When upper unit top bar 1 and lower unit top bar 5 are excavated, if scar has percolation phenomenon, radial high-pressure note is carried out
Slurry closure flowing water；
When applying median septum 3, if the upper unit of appearance is got out of a predicament or an embarrassing situation, 2 faces slip phenomenon of collapsing, and to reinforce face using bolt-spary supports,
Stable top bar core B soil.The construction of median septum 3 finishes and reached the 75% of concrete strength, can remove unit top bar 1
Core Soil B；
Scaffold 4 is connected to be connected using high-strength bolt, control high-strength bolt position is noted during construction, to facilitate scaffold
4 installation and removal；Scaffold 4, which is installed, wants strict control room away from, perpendicularity etc., forbids to invade secondary lining, steelframe connection
Screw must it is enough, tighten, injection is layered during gunite concrete from bottom to top, it is ensured that steelframe can not leave cavity behind；
Safe step pitch must be controlled in cross construction, makes secondary lining and inverted arch as close to face；
Every one measuring section of 5m cloth in tunnel, each section arranges that a vault sinking observation station and two horizontal clearances are received
Hold back measuring basis line.Headroom horizontal convergence is measured and vault sinking measures and uses equal amount measured frequency, and actual amount measured frequency is from table
It is middle that a higher measurement frequency is selected according to deformation velocity and excavated surface distance.Vault settlement and horizontal convergence, which are measured, to be adopted
Measured with laser cross section instrument, it is rapid on request after excavation that measuring point is installed and numbered, initial value is read in 12h after excavation.According to amount
Result is surveyed, displacement-time curve is drawn in time, regression analysis is carried out, judges adjoining rock stability situation, guiding construction.
Excessive turbulence preliminary bracing structure is avoided in the demolishing process of median septum 3 and scaffold 4.
After being constructed using this engineering method, the loss of reservoir water storage, tunnel sinking deformation, completely weathered granite chance water are successfully solved
Into problems such as sand, it is ensured that construction safety, quality, progress meet owner's requirement, improve comprehensive benefit.
Claims (10)
1. it is that tunnel along its cross-section radial is divided into upper list from top to bottom a kind of step construction method of Shallow-buried Large-span Tunnel Unit two six
First body（I）With lower unit body（II）Two construction sections, complete preparation of construction, surveying and locating, tunnel Shed-pipe Advanced Support（A）Branch nurse
After sequence, tunnel is excavated and supporting construction, it is characterised in that：Upper cell cube（I）Including upper unit top bar（1）With upper list
Member is got out of a predicament or an embarrassing situation（2）, lower unit body（II）Including lower unit top bar（5）Filled with inverted arch and inverted arch（6）, its construction method includes
Following steps：
Unit top bar on S1, excavation（1）And apply preliminary bracing；
Unit is got out of a predicament or an embarrassing situation on S2, excavation（2）And apply preliminary bracing；
S3, in upper cell cube（I）With lower unit body（II）Separated place install crossbeam（C）And apply concrete median septum（3）；
S4, in median septum（3）Upper installation scaffold（4）；
S5, excavation lower unit top bar（5）And apply preliminary bracing；
S6, excavate and apply inverted arch and inverted arch filling（6）, complete the closing cyclization of face；
Cross construction is carried out according to above-mentioned steps, until tunnel excavation support is completed, also can be after excavation supporting to certain length
Immediately following Second Lining Construction.
2. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S1
Unit top bar on excavation（1）, arc leading pit provided core soil method, Core Soil are excavated using ring（B）Length is ibid on unit
Step（1）Length is consistent, and ensures length no more than 3m, and width is the 1/3 ~ 1/2 of excavation width；Upper unit top bar（1）Open
Dig ratio of rise to span to be not less than after 0.3, excavation first by pneumatically placed concrete at the beginning of excavation face, top bar steelframe is further installed, and carry out linked network
Spray closing again with concrete.
3. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S2
Unit is got out of a predicament or an embarrassing situation on excavation（2）, symmetrically excavated using the left and right sides, after excavation immediately just pneumatically placed concrete, further install appear on the stage
Rank steelframe, and carry out linked network and concrete and spray closing again.
4. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S3
Treat that unit is got out of a predicament or an embarrassing situation（2）When length is more than 3m, and in upper cell cube（I）With lower unit body（II）Separated place install crossbeam
（C）, crossbeam（C）Fixed using I-steel and by spacer bar with supporting reinforcing bar, in further formwork and casting concrete every
Plate（3）.
5. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S4
In median septum（3）Upper installation scaffold（4）, refer to median septum（3）After concrete final set, along upper cell cube（I）Internal periphery
The interim work steel arch-shelf of face installation, 3 meters of work steel arch-shelf spacing, arch springing is fixed by bolts to median septum（3）On.
6. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S5
Excavate lower unit top bar（5）, symmetrically excavated using the left and right sides, after excavation immediately just pneumatically placed concrete, further install place an order
First top bar（5）Steelframe, and carry out linked network and concrete and spray closing again.
7. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Step S6
Excavate and apply inverted arch and inverted arch filling（6）Refer to, treat lower unit top bar（5）When length is more than 3m and is less than 5m, excavation is faced upward
Arch, inverted arch is of length no more than 3m/ times, applies inverted arch preliminary bracing after excavation in time, and pour inverted arch and arch filling（6）.
8. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to Claims 2 or 3 or 6, it is characterised in that：
Steelframe its steelframe foot position up 30 ~ 50cm height, be close to the side of steelframe two be angled downward 30 ° set lock pin anchor tube, lock
The long 4.5m of pin anchor tube, and with steelframe firm welding.
9. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1 or 4, it is characterised in that：It is horizontal
Beam（C）To be set parallel to face, median septum（3）It need to ensure that its concrete cover is not less than 5cm, median septum（3）Bottom
Keep smooth, median septum（3）Length is 5~10 meters.
10. the step construction method of a kind of Shallow-buried Large-span Tunnel Unit two six according to claim 1, it is characterised in that：Just spray
Concrete and concrete spray closing and carry out wet shot operation using manipulator concrete injection device again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710486125.3A CN107191206B (en) | 2017-06-23 | 2017-06-23 | A kind of six step construction method of Shallow-buried Large-span Tunnel Unit two |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710486125.3A CN107191206B (en) | 2017-06-23 | 2017-06-23 | A kind of six step construction method of Shallow-buried Large-span Tunnel Unit two |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107191206A true CN107191206A (en) | 2017-09-22 |
| CN107191206B CN107191206B (en) | 2019-07-12 |
Family
ID=59878158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710486125.3A Active CN107191206B (en) | 2017-06-23 | 2017-06-23 | A kind of six step construction method of Shallow-buried Large-span Tunnel Unit two |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107191206B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653751A (en) * | 2019-01-09 | 2019-04-19 | 济南城建集团有限公司 | A kind of use wears city expressway method for tunnel construction under yielding rubber ledge |
| CN111411977A (en) * | 2020-03-26 | 2020-07-14 | 中铁十二局集团有限公司 | Construction method for connecting diaphragm in single-hole double-layer tunnel by mould building |
| CN111502708A (en) * | 2020-05-22 | 2020-08-07 | 中铁三局集团广东建设工程有限公司 | Reinforcing construction method for existing tunnel transverse passage by shield underpass |
| CN114086971A (en) * | 2021-11-10 | 2022-02-25 | 福州大学 | Tunnel entering starting construction method for TBM encountering reservoir spillway |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008114939A1 (en) * | 2007-03-20 | 2008-09-25 | Young Moon Jung | Blast construction working method for a tunnel |
| CN102042019A (en) * | 2010-11-11 | 2011-05-04 | 中铁十三局集团第四工程有限公司 | Two-stair five-step excavation construction method for shallow-buried large-span soft plastic clay tunnel |
| CN102606162A (en) * | 2012-02-08 | 2012-07-25 | 中铁四局集团第二工程有限公司 | Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel |
| CN106761810A (en) * | 2016-11-23 | 2017-05-31 | 长安大学 | A kind of large-deformation tunnel in soft rock supporting structure system and its construction method |
| CN106761769A (en) * | 2016-11-23 | 2017-05-31 | 长安大学 | A kind of construction technology of big cross section large-deformation tunnel in soft rock |
-
2017
- 2017-06-23 CN CN201710486125.3A patent/CN107191206B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008114939A1 (en) * | 2007-03-20 | 2008-09-25 | Young Moon Jung | Blast construction working method for a tunnel |
| CN102042019A (en) * | 2010-11-11 | 2011-05-04 | 中铁十三局集团第四工程有限公司 | Two-stair five-step excavation construction method for shallow-buried large-span soft plastic clay tunnel |
| CN102606162A (en) * | 2012-02-08 | 2012-07-25 | 中铁四局集团第二工程有限公司 | Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel |
| CN106761810A (en) * | 2016-11-23 | 2017-05-31 | 长安大学 | A kind of large-deformation tunnel in soft rock supporting structure system and its construction method |
| CN106761769A (en) * | 2016-11-23 | 2017-05-31 | 长安大学 | A kind of construction technology of big cross section large-deformation tunnel in soft rock |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653751A (en) * | 2019-01-09 | 2019-04-19 | 济南城建集团有限公司 | A kind of use wears city expressway method for tunnel construction under yielding rubber ledge |
| CN111411977A (en) * | 2020-03-26 | 2020-07-14 | 中铁十二局集团有限公司 | Construction method for connecting diaphragm in single-hole double-layer tunnel by mould building |
| CN111502708A (en) * | 2020-05-22 | 2020-08-07 | 中铁三局集团广东建设工程有限公司 | Reinforcing construction method for existing tunnel transverse passage by shield underpass |
| CN111502708B (en) * | 2020-05-22 | 2024-05-28 | 中铁三局集团广东建设工程有限公司 | Reinforcing construction method for shield downward penetration of existing tunnel transverse channel |
| CN114086971A (en) * | 2021-11-10 | 2022-02-25 | 福州大学 | Tunnel entering starting construction method for TBM encountering reservoir spillway |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107191206B (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104500077B (en) | A kind of shallow-depth-excavation tunnel passes through cottage area construction method | |
| CN102606162B (en) | Quick construction method for weak surrounding rock shallowly-buried easily-collapsed area of tunnel | |
| CN104564128B (en) | A kind of shallow-depth-excavation tunnel construction deformation monitoring method | |
| CN106437726B (en) | Shallow-depth-excavation tunnel crosses ground fissure crushed zone construction method | |
| CN101994513B (en) | Method for constructing tunnel by finishing full section curtain grouting from upper-half section | |
| CN106761778B (en) | A kind of underground digging in subway station construction technology suitable for upper-soft lower-hard ground | |
| CN202707075U (en) | Long-span subway station main structure constructed based on column and arch method | |
| CN110067563A (en) | Close on the station entrance-exit main structure construction method of urban architecture and road | |
| CN110905530B (en) | Stability control construction method for water-rich soft rock tunnel penetrating fault fracture zone | |
| CN110130927A (en) | A kind of carbonaceous slate serious deformation control construction method | |
| CN106968690A (en) | The method for tunnel construction for soil property of caving in | |
| CN105201516B (en) | A kind of main structure of subway station and its tetrad arch PBA excavating construction methods | |
| CN107313431A (en) | Close on not contour foundation ditch method for synchronously constructing | |
| CN106049195A (en) | Method for strengthening subgrade basement of existing high speed railway line | |
| CN108842819A (en) | A kind of urban track traffic cable run method for tunnel construction | |
| CN109723443A (en) | Method for tunnel construction | |
| CN107288642A (en) | PBA construction technologies | |
| CN107191206B (en) | A kind of six step construction method of Shallow-buried Large-span Tunnel Unit two | |
| CN110778328B (en) | Loess tunnel entrance section construction method for passing through landslide body | |
| CN111119128B (en) | Danger-removing, reinforcing and seepage-proofing method for natural rock-fill dam of barrier lake | |
| CN110439590A (en) | Method for tunnel construction | |
| CN110284885A (en) | Shield inspection-pit construction method | |
| CN114233385A (en) | Treatment method for mud burst and water burst of inclined shaft | |
| CN110735436A (en) | cutting rock slope reinforced structure | |
| CN110847929B (en) | Tunnel portal section pre-reinforcing and excavating construction method based on partition blasting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |