CN110454170A - Tunnel connection channel construction method based on freezing process - Google Patents
Tunnel connection channel construction method based on freezing process Download PDFInfo
- Publication number
- CN110454170A CN110454170A CN201910763178.4A CN201910763178A CN110454170A CN 110454170 A CN110454170 A CN 110454170A CN 201910763178 A CN201910763178 A CN 201910763178A CN 110454170 A CN110454170 A CN 110454170A
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- China
- Prior art keywords
- connection channel
- tunnel
- excavated
- construction method
- tunnel connection
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Abstract
The invention discloses a kind of tunnel connection channel construction methods based on freezing process, the construction method includes: S1) the assembled seam treated between the tunnel wall section of jurisdiction of tunneling service channel mouth surrounding welded, remove the tunnel wall section of jurisdiction within the scope of tunnel connection channel mouth to be excavated；S2 the tunnel connection channel) is excavated using full section method, soil body heat preservation is carried out after excavation and applies preliminary bracing；S3) levelling to the progress of preliminary bracing surface, exposed splice is cut off or polished, carries out construction of waterproof layer later；S4 secondary lining) is applied, the construction of the tunnel connection channel is completed.Construction procedure is simple and easy, can obtain the tunnel connection channel for meeting design requirement.
Description
Technical field
The invention belongs to Tunnel Design technical fields, and in particular to a kind of tunnel connection channel construction party based on freezing process
Method.
Background technique
The effects of service channel is generally arranged between two tunnels, plays connection, draining and fire prevention a, if tunnel goes out
Existing problem, pedestrian can be transferred to an other tunnel by interface channel, significantly increase safety coefficient, therefore have " escape
The title in channel "；Also facilitate simultaneously a tunnel when something goes wrong, it is logical that rescue personnel can reach contact from an other tunnel
Then road enters the position for needing to rescue via service channel, achievees the purpose that Quick rescue, in the tunnel using construction freezing method
In road, how constructing, to form the tunnel connection channel for meeting design requirement be to need key problems-solving.
Summary of the invention
The present invention provides a kind of tunnel connection channel construction method based on freezing process, and construction procedure is simple and easy, can
Obtain the tunnel connection channel for meeting design requirement.
Tunnel connection channel construction method provided by the invention based on freezing process, the construction method include: S1) it treats
Assembled seam between the tunnel wall section of jurisdiction of tunneling service channel mouth surrounding is welded, and tunnel connection channel to be excavated is removed
Tunnel wall section of jurisdiction in mouth range；S2 the tunnel connection channel) is excavated using full section method, soil body heat preservation is carried out after excavation simultaneously
Apply preliminary bracing；S3) to preliminary bracing surface carry out it is levelling, exposed splice is cut off or is polished, it is laggard
Row construction of waterproof layer；S4 secondary lining) is applied, the construction of the tunnel connection channel is completed.
Preferably, before step S1), this method further include: set up tunneling platform；Service channel to be excavated is installed
Mouth prestress stent；Service channel mouth protective door to be excavated is installed.
Preferably, step S1) in, remove the tunnel wall section of jurisdiction of tunnel connection channel mouth to be excavated, comprising:
It is removed using the tunnel wall section of jurisdiction of chain block and jack pair tunnel connection channel mouth to be excavated.
Preferably, step S2) in, during excavating the tunnel connection channel using full section method, excavate step pitch control
In preset distance, excavated section backbreaks no more than predetermined length, central excavation line deviation no more than target offset.
Preferably, the preset distance is 0.5m；The predetermined length is 30mm, and the target offset is 20mm.
Preferably, step S2) in, it is described to apply preliminary bracing, comprising: to set up bracing members frame；In the bracing members frame and
Sandwiched plank lagging between Frozen Soil Cylinder；Steel mesh is hung on the bracing members frame；To the bracing members frame and the steel mesh
Gap gunite concrete.
Preferably, the strength grade of the concrete is C25, and the match ratio of the concrete is cement: sand: stone: water: outer
Agent is added to be equal to 1:1.85:1.92:0.45:0.04, wherein the cement uses 42.5 cement of PO.
Preferably, step S2) in, it is described that apply preliminary bracing include: to spray predetermined thickness for the first time；At the beginning of jetting cement for the first time
Secondary injection sizing is carried out after solidifying.
Preferably, the predetermined thickness is 150mm.
Preferably, step S3) in, carrying out construction of waterproof layer includes: that setting blossom type pads；Waterproof is laid with using without nail
Layer.
Tunnel connection channel construction method provided by the invention based on freezing process treats tunneling service channel mouth four
Assembled seam between the tunnel wall section of jurisdiction in week is welded, and is welded by the way of being fully welded, to improve tunnel wall section of jurisdiction
Globality；It is removed using the tunnel wall section of jurisdiction within the scope of chain block and jack pair tunnel connection channel mouth to be excavated,
It is easy to operate flexible；The tunnel connection channel is excavated using full section method, effectively to pass through freezing curtain；It is applied after excavation
Make preliminary bracing to guarantee the stability of native curtain, while needing to carry out soil body heat preservation after excavation to keep having for Frozen Soil Cylinder
Effect property；It is levelling to the progress of preliminary bracing surface, exposed splice is cut off or polished, waterproof layer is carried out later and applies
Work, when to prevent frozen soil layer defrosting, melt water enters in tunnel the safety for influencing tunnel；Secondary lining is applied, is further strengthened pair
The support of the tunnel connection channel completes tunnel connection channel construction, obtains the tunnel connection channel for meeting design requirement.
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 process of the tunnel connection channel construction method based on freezing process of embodiment according to the present invention
Figure.
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.
As shown in Figure 1, the tunnel connection channel construction method provided by the invention based on freezing process, the construction method packet
Including: S1) the assembled seam treated between the tunnel wall section of jurisdiction of tunneling service channel mouth surrounding welded, remove tunnel to be excavated
Tunnel wall section of jurisdiction within the scope of road service channel mouth；S2 the tunnel connection channel) is excavated using full section method, is carried out after excavation
The soil body keeps the temperature and applies preliminary bracing；S3) levelling to the progress of preliminary bracing surface, exposed splice is cut off or ground
It is flat, construction of waterproof layer is carried out later；S4 secondary lining) is applied, the construction of the tunnel connection channel is completed.
Before carrying out tunnel connection channel construction, progress preparation of construction work first, comprising: it is flat to set up tunneling
Platform；Service channel mouth prestress stent to be excavated is installed；Service channel mouth protective door to be excavated is installed.
Setting up tunneling platform includes that it is flat to build Freezing Station according to tunnel connection channel outlet size and construction needs
Platform excavates platform and ramp, in order to which construction personnel is current and carries out constructing operation.Specifically, join in tunnel to be excavated
The excavation platform is built in network passway position, and area is 2m × 3.5m=7m2；Side is transported in tunnel connection channel, is built tiltedly
Ramp is connected with the excavation platform, length of grade about 8m, and the gradient is that principle can be adjusted suitably in order to which vehicle transports up and down
It is whole；It is built in the other side for excavating platform and freezes platform, 16# I-steel can be used and built, and tunnel can be ridden over
On wall section of jurisdiction, table top is formed with 50mm solid wood bedding.
Service channel mouth prestress stent to be excavated is installed, to prevent the excavation service channel mouth during excavation
Cave-in accident occurs；Service channel mouth protective door to be excavated is installed, Sand occurs during excavating service channel
It is closed when accident, to guarantee the safety in tunnel.
According to the technique and scheme of the present invention, the construction method includes: step S1) treat tunneling service channel mouth four
Assembled seam between the tunnel wall section of jurisdiction in week is welded, and is welded by the way of being fully welded, to improve tunnel wall section of jurisdiction
Globality, and when preventing from removing the tunnel wall section of jurisdiction within the scope of tunnel connection channel mouth to be excavated, the tunnel wall section of jurisdiction pine of surrounding
It is dynamic to fall off；Assembly is stitched first before welding and carries out rust removing and contaminant releasing processing, to avoid rosin joint；When welding, using dividing, region is symmetrical
The mode of welding causes tunnel wall segment deformation to prevent stress from concentrating；Welding material can select E4303 type structural steel to weld
Item is welded using manual electric arc welding.
Remove the tunnel wall section of jurisdiction within the scope of tunnel connection channel mouth to be excavated, it is preferable that use chain block and very heavy
The tunnel wall section of jurisdiction that tunneling service channel mouth is treated on top is removed, easy to operate flexible.Specifically, prepare two 32t
Jack, 5t, 10t and 2t chain block each one, two jack stands are by open pipe piece two sides, the intermediate same pipe of a crossbeam
Piece connection, pushes out trombone slide piece by pushing tow crossbeam, during operation, needs to observe section of jurisdiction stress and misalignment, disappear
Except local factor of being obstructed, segment deformation is prevented；5t, 10t chain block are used as main drawing section of jurisdiction, and pipe to be torn open is hooked in one end
Piece, one end are hitched on tunnel duct piece over there, and horizontal direction reinforces the drawing section of jurisdiction into tunnel；2t cucurbit is suspended in section of jurisdiction to be torn open
On the section of jurisdiction of top, section of jurisdiction to be torn open is hooked in one end, falls on workbench to prevent pounding suddenly when the pull-out of section of jurisdiction.
Since the soil body around tunnel has used freezing process to be reinforced, frozen soil strength is higher, freezing curtain bearing capacity
Greatly, therefore according to the technique and scheme of the present invention, step S2) using the full section method excavation tunnel connection channel, with effective
Pass through freezing curtain；During excavating the tunnel connection channel using full section method, excavate step pitch control in preset distance,
Excavated section is backbreak no more than predetermined length, central excavation line deviation no more than target offset, it is preferable that the preset distance is
0.5m；The predetermined length is 30mm, and the target offset is 20mm.
When finding geological condition and different design in digging process, design and supervisor should be notified in time, is showed
Field is verified, while should carry out convergent deformation monitoring, to adjust support pattern and structure in time, and pays attention to the position of freezing pipe
It sets, to prevent pneumatic tools from breaking freezing pipe；If Freezing Station personnel should be notified to close valve in time there is a situation where breaking freezing pipe
Door, repair welding freezing pipe.
After service channel excavates, the stress equilibrium that formation crude has is destroyed, and the stress in channel circumference stratum is caused
Redistribution, the stress of this redistribution not only make upper formation generate displacement, but also will form new additional load effect
On the Frozen Soil Cylinder reinforced, when the pressure that Frozen Soil Cylinder wall is born is more than frozen soil strength, Frozen Soil Cylinder and freeze
Pipe can generate creep, for the development for controlling this deformation, will carry out timely supporting to freezing curtain in time after Mechanical Excavation of Frozen Soil,
So the preliminary bracing of service channel is stablized as maintenance stratum, it is ensured that an important technique measure of construction safety, and make
It is the most key step of support process for a part of permanent support, therefore according to the technique and scheme of the present invention, after excavation
Carry out soil body heat preservation and simultaneously apply preliminary bracing to guarantee the stability of native curtain, at the same need after excavation to carry out soil body heat preservation with
Keep the validity of Frozen Soil Cylinder.
A kind of embodiment according to the present invention, it is preferable that step S2) in, it is described to apply preliminary bracing, comprising: to set up
Bracing members frame；The sandwiched plank lagging between the bracing members frame and Frozen Soil Cylinder；Steel mesh is hung on the bracing members frame；To institute
State the gap gunite concrete of bracing members frame and the steel mesh.
I16 combined steel support frame can be used, I steel is processed into straight legs arch support and rectangle support, and steel arch-shelf is
Closing form is for the preliminary bracing in horn mouth and channel, and for the stability for increasing bracket, per pass mid-stent is added with one
Stull, arch support row's spacing is opposite with the excavation step pitch in channel to should be 0.50m, must be longitudinal with Φ 22 between adjacent two rows bracket
Muscle is connected with each other, longitudinal rib circumferential direction spacing 1m, to increase the globality and stability of entire support system.
In order to control the deformation of freezing curtain between bracket, freezing curtain loss of refrigeration capacity is reduced, with wood after all bracing members framves
The close back of backboard, backboard must be close to frost wall, reduce supporting gap to the greatest extent, and plank lagging cannot loosen, when supporting gap is larger
When, back plate thickness and Muzizi can be increased or in time fill plank lagging and formation void sandy soil etc., to improve supporting effect.
Due to being wooden structures by spray plane, unfavorable ejecta is assembled, therefore hangs steel mesh on the bracing members frame, is separately existed
Several bar dowels are welded in bracing members bracket appropriate location, to control concrete ejection thickness.Preferably, the concrete
Strength grade is C25, and the match ratio of the concrete is cement: sand: stone: water: additive is equal to 1:1.85:1.92:0.45:
0.04, wherein the cement uses 42.5 cement of PO.
A kind of embodiment according to the present invention, step S2) in, it is described that apply preliminary bracing include: that injection for the first time is predetermined
Thickness；Secondary injection sizing is carried out after the initial set of jetting cement for the first time.
Gunite concrete thickness should encase the bracing members frame, and protective layer thickness is not less than 35mm, just branch with a thickness of
250mm, it is once not easily molded to be sprayed in two times: to spray predetermined thickness for the first time；It is carried out after the initial set of jetting cement for the first time secondary
Injection sizing.It should be noted that wind pressure, water pressure, spray angle, nozzle to the distance by spray plane when injection；After first lower part is answered in injection
Top, it is vertical with by spray plane；Accelerator should be added in spraying of material as required, the wood after spraying bracing members frame described in wall position
Backboard removes several pieces, so that spraying of material enters between plank lagging and freezing curtain, connects convenient for branch sheath and passageway perimeter soil layer
Touch it is closely knit, to prevent frozen soil layer defrosting when, stratum deformation destroy channel.Preferably, the predetermined thickness sprayed for the first time is 150mm.
According to the technique and scheme of the present invention, step S3) to preliminary bracing surface carry out it is levelling, to exposed splice into
Row excision or polish, it is levelling after basal plane answer it is smooth, without thin projections, it is preferable that flatness be not more than 1/6, carry out later
Construction of waterproof layer, when to prevent frozen soil layer defrosting, melt water enters in tunnel the safety for influencing tunnel.
A kind of embodiment according to the present invention, it is preferable that step S3) in, carrying out construction of waterproof layer includes: setting plum blossom
Type liner；It is laid with waterproof layer using without nail, to guarantee waterproof effect.Using EVA splash guard with a thickness of 1.5mm, pad as plum blossom
Type arrangement, spacing are that 0.7 × 0.7m of vault, 1.0 × 1.0m of abutment wall, 1.5 × 1.5m of bottom should be recessed when part is concave-convex larger
Place carries out encryption arrangement, does not allow to follow closely bright nail on splash guard；The seam of splash guard melts machine using automatic heating and carries out double weld seam welderings
It connects；The splash guard seam crossing lap of splice is 100mm, weld width 10mm.
According to the technique and scheme of the present invention, step S4) secondary lining is applied, it further strengthens to the tunnel connection channel
Support, complete the construction of the tunnel connection channel.
Tunnel connection channel construction method provided by the invention based on freezing process treats tunneling service channel mouth four
Assembled seam between the tunnel wall section of jurisdiction in week is welded, and is welded by the way of being fully welded, to improve tunnel wall section of jurisdiction
Globality；It is removed using the tunnel wall section of jurisdiction of chain block and jack pair tunnel connection channel mouth to be excavated, operation letter
It is single flexible；The tunnel connection channel is excavated using full section method, effectively to pass through freezing curtain；Initial stage is applied after excavation
Supporting needs to carry out validity of the soil body heat preservation to keep Frozen Soil Cylinder after excavation to guarantee the stability of native curtain；
It is levelling to the progress of preliminary bracing surface, exposed splice is cut off or polished, carries out construction of waterproof layer later, to prevent
When frozen soil layer thaws, melt water enters in tunnel the safety for influencing tunnel；Secondary lining is applied, is further strengthened to the tunnel
The construction of the tunnel connection channel is completed in the support of service channel, obtains the tunnel connection channel for meeting design requirement.
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 tunnel connection channel construction method based on freezing process, which is characterized in that the construction method includes:
S1 the assembled seam) treated between the tunnel wall section of jurisdiction of tunneling service channel mouth surrounding is welded, and is removed to be excavated
Tunnel wall section of jurisdiction within the scope of tunnel connection channel mouth；
S2 the tunnel connection channel) is excavated using full section method, soil body heat preservation is carried out after excavation and applies preliminary bracing；
S3) levelling to the progress of preliminary bracing surface, exposed splice is cut off or polished, waterproof layer is carried out later and applies
Work；
S4 secondary lining) is applied, the construction of the tunnel connection channel is completed.
2. construction method according to claim 1, which is characterized in that before step S1), this method further include:
Set up tunneling platform；
Service channel mouth prestress stent to be excavated is installed；
Service channel mouth protective door to be excavated is installed.
3. construction method according to claim 1, which is characterized in that step S1) in, remove tunnel connection channel to be excavated
The tunnel wall section of jurisdiction of mouth, comprising:
It is removed using the tunnel wall section of jurisdiction of chain block and jack pair tunnel connection channel mouth to be excavated.
4. construction method according to claim 1, which is characterized in that step S2) in, described in being excavated using full section method
During tunnel connection channel, excavation step pitch control is in preset distance, excavated section is backbreak no more than predetermined length, central excavation
Line deviation is not more than target offset.
5. construction method according to claim 4, which is characterized in that the preset distance is 0.5m；The predetermined length
For 30mm, the target offset is 20mm.
6. construction method according to claim 1, which is characterized in that step S2) in, it is described to apply preliminary bracing, comprising:
Set up bracing members frame；
The sandwiched plank lagging between the bracing members frame and Frozen Soil Cylinder；
Steel mesh is hung on the bracing members frame；
To the gap gunite concrete of the bracing members frame and the steel mesh.
7. construction method according to claim 6, which is characterized in that the strength grade of the concrete is C25, described mixed
The match ratio for coagulating soil is cement: sand: stone: water: additive is equal to 1:1.85:1.92:0.45:0.04, wherein the cement uses
42.5 cement of PO.
8. construction method according to claim 1, which is characterized in that step S2) in, it is described to apply preliminary bracing and include:
Predetermined thickness is sprayed for the first time；
Secondary injection sizing is carried out after the initial set of jetting cement for the first time.
9. construction method according to claim 8, which is characterized in that the predetermined thickness is 150mm.
10. construction method according to claim 1, which is characterized in that step S3) in, carrying out construction of waterproof layer includes:
Blossom type is arranged to pad；
Waterproof layer is laid with using without nail.
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| CN201910763178.4A CN110454170A (en) | 2019-08-19 | 2019-08-19 | Tunnel connection channel construction method based on freezing process |
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| CN201910763178.4A CN110454170A (en) | 2019-08-19 | 2019-08-19 | Tunnel connection channel construction method based on freezing process |
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| CN110454170A true CN110454170A (en) | 2019-11-15 |
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| CN201910763178.4A Pending CN110454170A (en) | 2019-08-19 | 2019-08-19 | Tunnel connection channel construction method based on freezing process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111075455A (en) * | 2019-12-24 | 2020-04-28 | 中交路桥建设有限公司 | Freezing method channel construction process |
| CN113803074A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for artificial and mechanical combined obstacle removal of water-rich sand layer |
| CN113803073A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually removing obstacles on water-rich sand layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111075455A (en) * | 2019-12-24 | 2020-04-28 | 中交路桥建设有限公司 | Freezing method channel construction process |
| CN113803074A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for artificial and mechanical combined obstacle removal of water-rich sand layer |
| CN113803073A (en) * | 2021-09-27 | 2021-12-17 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually removing obstacles on water-rich sand layer |
| CN113803073B (en) * | 2021-09-27 | 2024-01-19 | 长江勘测规划设计研究有限责任公司 | Construction method of tunnel structure for manually clearing obstacle in water-rich sand layer |
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Application publication date: 20191115 |