CN110130316A - The method of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction - Google Patents
The method of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction Download PDFInfo
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- CN110130316A CN110130316A CN201910392423.5A CN201910392423A CN110130316A CN 110130316 A CN110130316 A CN 110130316A CN 201910392423 A CN201910392423 A CN 201910392423A CN 110130316 A CN110130316 A CN 110130316A
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- injected hole
- grouting pipe
- service channel
- slip casting
- row
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- 238000007710 freezing Methods 0.000 title claims abstract description 43
- 230000008014 freezing Effects 0.000 title claims abstract description 43
- 239000011440 grout Substances 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000013461 design Methods 0.000 claims abstract description 32
- 238000007569 slipcasting Methods 0.000 claims description 109
- 239000002002 slurry Substances 0.000 claims description 31
- 239000004568 cement Substances 0.000 claims description 23
- 239000004115 Sodium Silicate Substances 0.000 claims description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 210000004911 serous fluid Anatomy 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229910052731 fluorine Inorganic materials 0.000 claims description 7
- 239000011737 fluorine Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 21
- 230000002787 reinforcement Effects 0.000 description 19
- 239000004927 clay Substances 0.000 description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 239000004576 sand Substances 0.000 description 9
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000009977 dual effect Effects 0.000 description 6
- 235000019353 potassium silicate Nutrition 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000012407 engineering method Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
Abstract
The invention discloses the methods of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction, the system is equipped at least 1 row's injected hole in the design freezing range (9) of service channel bottom, and every row's injected hole at least 1, Grouting Pipe is inserted into design freezing range (9) from injected hole, the angle of every row's injected hole and tunnel center line is 10 ° -80 °, and the angle of Grouting Pipe and tunnel center line is 15 ° -75 °.Compared with prior art, the invention has the following advantages that after (1) pre-pouring grout system in service channel bottom of the present invention and control freezing construction thaw collapse method can after effective control freezing construction frozen soil melt caused by stratum settlement, without in service channel top and two sides pre-pouring grout, without carrying out compensation and grouting after freezing；(2) system and method short time limit of the present invention, and it is at low cost.
Description
Technical field
The invention belongs to frozen construction technical field, it is related to a kind of method of thaw collapse after control service channel frozen construction,
The method of thaw collapse specially after service channel bottom pre-pouring grout system and control freezing construction.
Background technique
Freezing consolidation is widely used in Shanghai, Nanjing, in the construction of the rich waters soft soil layer tunnel connection channel such as Suzhou, this
Engineering method fastening strength is high, and sealing performance is good, but larger with the later period thaw collapse that this engineering method is constructed.Service channel frozen construction terminates
Afterwards, stratum settlement, selected most dependence at slip casting position generally are controlled in such a way that frost free period tracking grouting fills the soil body
Engineering experience, for grouting amount only only in accordance with daily Ground Subsidence Monitoring, the controllability of engineering is poor, it is difficult to fully control soft soil layer
Work after thaw collapse, can make neighboring buildings generate sedimentation, cracking etc. adverse effects；Simultaneously because the thaw collapse influence period is longer, early period
Slip casting it is not in place often lead to metro operation during, upper and lower line generates differential settlement, causes serious security risk.
To ensure going on smoothly for engineering, guarantees safety of surrounding environment, before some service channel frozen constructions, first joining
Network channel is up and down and cement slurry is injected in two sides, carries out engineering with artificial freezing method construction again on the basis of the soil cement formed later.
The soil layer that freezes for carrying out pre-pouring grout settles smaller during thawing, but cement consumption is larger, and artificial and equipment cost is larger.
One of the technical issues of thaw collapse freezes most critical after service channel pre-pouring grout control work is exactly to infuse in advance to service channel
The construction of slurry, construction is more complicated, and construction cost is larger.Currently used method is exactly above and below service channel and two sides
Cement slurry is injected, soil layer can be reinforced again and can control the thaw collapse after freezing, but to expend a large amount of grouting serous fluid, is employed a large amount of
Equipment and artificial, and be affected to section of jurisdiction, construction period is longer.It has been investigated that service channel thaw collapse is mainly the bottom of by
Caused by the thaw collapse in portion region, controlling bottom thaw collapse can be such that overall thaw collapse reaches in engineering permission subsidence range, not influence
Neighboring buildings and the operation of subway later period, therefore need emphasis to reinforce the reinforcing to contact the bottom of the channel in construction.
Summary of the invention
The technical issues of solution: for overcome the deficiencies in the prior art, obtaining one kind being capable of quickly and effectively control freezing
The construction method of thaw collapse after work, without on service channel top and two sides pre-pouring grout, without carrying out compensation and grouting after freezing,
The present invention provides the methods of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction.
Technical solution: service channel bottom pre-pouring grout system, design freezing range of the system in service channel bottom
It is interior to be equipped at least 1 row's injected hole, and every row's injected hole at least 1, it is inserted into Grouting Pipe into design freezing range from injected hole,
The angle of every row's injected hole and tunnel center line is 10 ° -80 °, and the angle of Grouting Pipe and tunnel center line is 15 ° -75 °.
Preferably, the injected hole is 3 rows, respectively the first injected hole, the second injected hole and third injected hole.
Preferably, the angle of the first injected hole and tunnel center line is 15 °, the angle of the second injected hole and tunnel center line
It is 30 °, the angle of third injected hole and tunnel center line is 60 °.
Preferably, between the spacing between the first injected hole, the second injected hole and the second injected hole, third injected hole
Away from than for 1:2-1:0.8.
Preferably, every row's injected hole has 7, and is arranged symmetrically along service channel center line.
Preferably, Grouting Pipe corresponding with the first injected hole, the second injected hole and third injected hole is respectively the first slip casting
Pipe, the second Grouting Pipe and third Grouting Pipe, wherein the angle of the first Grouting Pipe and tunnel center line is 45 °, the second Grouting Pipe and
The angle of third Grouting Pipe and tunnel center line is 60 °.
Preferably, the first Grouting Pipe, the second Grouting Pipe and third Grouting Pipe are merogenesis Grouting Pipe, and the ratio between slip casting depth is
1:2:2。
The method of thaw collapse after the construction of any description above service channel bottom pre-pouring grout system control freezing, includes following step
It is rapid:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Right line is symmetrical arranged, and preferably both sides respectively set 4, and totally 8；
B. Grouting Pipe is arranged, pierces Grouting Pipe from reserved slip casting hole location, carries out slip casting, and Grouting Pipe merogenesis is arranged, preferably
Grouting Pipe selects 30 × 6mm of Φ, 20# low-carbon seamless steel pipe Grouting Pipe, and 1m is a section；
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump, and grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry, cement slurry and water glass solution volume ratio are 3:1-4:1, wherein the cement slurry ratio of mud
For 0.7-1.25, concentration of sodium silicate is 20Be ' -50Be ', and grouting pressure 0.2-0.8MPa, flow rate of grouting control is in 1.0-
2m3/h；
D. slip casting principle and mode, first in the injected hole slip casting of left line service channel two sides of the bottom section of jurisdiction, left line is all infused
After slurry, then in right line slip casting, pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle, is infused section by section according to projected depth
It starches, the injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second row
The injected hole at both ends starts slip casting, is then successively perfused to intermediate injected hole, then arranges intermediate injected hole to two from third
The injected hole slip casting at end；
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil；
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, is conserved 14 days, frozen construction is started, is kept
- 30~-28 DEG C of minimum brine temp, until design frozen region reinforces and completes.
The utility model has the advantages that (1) pre-pouring grout system in service channel bottom of the present invention and control freezing construction after thaw collapse side
Method can after effective control freezing construction frozen soil melt caused by stratum settlement, without pre- on service channel top and two sides
Slip casting, without carrying out compensation and grouting after freezing；(2) system and method short time limit of the present invention, and it is at low cost.
Detailed description of the invention
Fig. 1 is the bottom substance schematic diagram of service channel bottom pre-pouring grout system of the present invention；
Fig. 2 is the A-A sectional view of Fig. 1；
Fig. 3 is the B-B sectional view of Fig. 1；
Wherein, the first injected hole of 1-, the second injected hole of 2-, 3- third injected hole, the first Grouting Pipe of 4-, the second slip casting of 5-
Pipe, 6- third Grouting Pipe, 7- service channel center line, the tunnel 8- center line, 9- design freezing range, and 10- reserves injected hole
Section of jurisdiction.
Specific embodiment
Following embodiment further illustrates the contents of the present invention, but should not be construed as limiting the invention.Without departing substantially from
In the case where spirit of that invention and essence, to modification made by the method for the present invention, step or condition and replaces, belong to the present invention
Range.Unless otherwise specified, the conventional means that technological means used in embodiment is well known to those skilled in the art.
Embodiment 1
Service channel bottom pre-pouring grout system, the system are equipped with extremely in the design freezing range 9 of service channel bottom
Few 1 row's injected hole, and every row's injected hole at least 1, Grouting Pipe, every row's note are inserted into design freezing range 9 from injected hole
The angle for starching hole and tunnel center line is 10 ° -80 °, and the angle of Grouting Pipe and tunnel center line is 15 ° -75 °.
The injected hole is 3 rows, respectively the first injected hole 1, the second injected hole 2 and third injected hole 3.
The angle of first injected hole 1 and tunnel center line is 15 °, and the angle of the second injected hole 2 and tunnel center line is
30 °, third injected hole 3 and the angle of tunnel center line are 60 °.
The spacing between spacing and the second injected hole 2, third injected hole 3 between first injected hole 1, the second injected hole 2
Than for 1:2-1:0.8.
Every row's injected hole has 7, and is arranged symmetrically along service channel center line 7.
Grouting Pipe corresponding with the first injected hole 1, the second injected hole 2 and third injected hole 3 be respectively the first Grouting Pipe 4,
Second Grouting Pipe 5 and third Grouting Pipe 6, wherein the first Grouting Pipe 4 and the angle of tunnel center line are 45 °, 5 He of the second Grouting Pipe
The angle of third Grouting Pipe 6 and tunnel center line is 60 °.
First Grouting Pipe 4, the second Grouting Pipe 5 and third Grouting Pipe 6 are merogenesis Grouting Pipe, and the ratio between slip casting depth is 1:2:
2。
The method of thaw collapse after the construction of any description above service channel bottom pre-pouring grout system control freezing, includes following step
It is rapid:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Right line is symmetrical arranged, and preferably both sides respectively set 4, and totally 8；
B. Grouting Pipe is arranged, pierces Grouting Pipe from reserved slip casting hole location, carries out slip casting, and Grouting Pipe merogenesis is arranged, preferably
Grouting Pipe selects 30 × 6mm of Φ, 20# low-carbon seamless steel pipe Grouting Pipe, and 1m is a section；
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump, and grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry, cement slurry and water glass solution volume ratio are 3:1~4:1, wherein the cement slurry ratio of mud
It is 0.7~1.25, concentration of sodium silicate is 20Be '~50Be ', and grouting pressure is 0.2~0.8MPa, and flow rate of grouting is controlled 1.0
~2m3/h；
D. slip casting principle and mode, first in the injected hole slip casting of left line service channel two sides of the bottom section of jurisdiction, left line is all infused
After slurry, then in right line slip casting, pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle, is infused section by section according to projected depth
It starches, the injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second row
The injected hole at both ends starts slip casting, is then successively perfused to intermediate injected hole, then arranges intermediate injected hole to two from third
The injected hole slip casting at end；
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil；
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, is conserved 14 days, frozen construction is started, is kept
- 30~-28 DEG C of minimum brine temp, until design frozen region reinforces and completes.
Embodiment 2
Suzhou Metro Connection Passage, it is silty clay layer, clay silt folder that place geology rises on ground from top to bottom
Silty clay layer, silty sand ground, silty clay layer.Stratum locating for service channel is silty sand ground.Service channel buried depth 14m.Reinforce work
Cheng Caiyong service channel bottom pre-pouring grout+horizontal freezing joint reinforcement.It is required according to designer, service channel reinforcement depth is
6m。
For this engineering using thaw collapse technology after contact bottom pre-pouring grout control work, specific technical solution is as follows:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Each 4, totally 8, right line.Service channel two sides are equipped with three rows in the part in service channel bottom design freezing range
Injected hole, first row and tunnel centerlines are 15 °, arrange 7 injected holes, spacing 50cm；Second row and tunnel center
Wire clamp angle is 30 degree, arranges 7 injected holes, spacing 50cm；Third row is 60 ° with tunnel centerlines, arranges 7 slip castings
Hole, spacing 50cm；Spacing between first row and second row is 60cm, and the spacing between second row and third row is 70cm.
B. Grouting Pipe is arranged, is pierced Grouting Pipe to reserved slip casting hole location and is carried out slip casting, Grouting Pipe selects Φ 30mm seamless steel
Pipe Grouting Pipe, 1m are a section.First row Grouting Pipe is oliquely downward inserted into the soil body from injected hole with 45 ° of direction, reaches design and freezes
Tie the position of bottom range.Second row and third row's Grouting Pipe are oliquely downward inserted into the soil body from injected hole with 60 ° of direction.?
The Grouting Pipe design reinforcement depth that third arranges injected hole arrangement is 6m, and point 6 section Grouting Pipes, each slip casting depth is 1m, that is, is segmented
Slip casting is inserted into 1m Grouting Pipe every time, next section Grouting Pipe is inserted into after slip casting；It is set in the Grouting Pipe of second row injected hole arrangement
Meter reinforcement depth is 6m, point 6 section Grouting Pipes, segmenting slip casting；First row injected hole arrangement Grouting Pipe design reinforcement depth 3m,
Divide 3 section Grouting Pipes, segmenting slip casting.
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump.Grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry.Cement slurry and water glass solution volume ratio are as follows: 1:0.25, wherein the cement slurry ratio of mud
For 1:0.8, concentration of sodium silicate is 20Be ', and grouting pressure 0.5MPa, flow rate of grouting control is in 2m3/h。
D. slip casting principle and method, the injected hole slip casting of the first section of jurisdiction in left line service channel two sides of the bottom, left line are whole
After slip casting, then in right line slip casting.Pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle.Section by section according to projected depth
Slip casting.Injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second
The injected hole at row both ends starts slip casting, is then successively perfused to intermediate injected hole.Then from the intermediate injected hole of third row to
The injected hole slip casting at both ends.
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil.
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, starts frozen construction, keeps minimum salt water temperature
- 30~-28 DEG C of degree, until design frozen region reinforces and completes.
Embodiment 3
Changzhou Metro Connection Passage, locating soil layer are miscellaneous fill layer, silty clay layer, silty clay from top to bottom
Layer, flour sand press from both sides clayey silt layer, silty sand ground, silty clay layer.Stratum locating for service channel is silty sand ground.Service channel buried depth
15m.Reinforcing engineering uses service channel bottom pre-pouring grout+horizontal freezing joint reinforcement.It is required according to designer, service channel
Reinforcement depth is 8m.
For this engineering using thaw collapse technology after contact bottom pre-pouring grout control work, specific technical solution is as follows:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Each 4, totally 8, right line.Service channel two sides are equipped with three rows in the part in service channel bottom design freezing range
Injected hole, first row and tunnel centerlines are 15 °, arrange 7 injected holes, spacing 50cm；Second row and tunnel center line
Angle is 30 °, arranges 7 injected holes, spacing 60cm；Third row is 60 ° with tunnel centerlines, arranges 7 injected holes,
Spacing is 60cm；Spacing between first row and second row is 60cm, and the spacing between second row and third row is 60cm.
B. Grouting Pipe is arranged, is pierced Grouting Pipe to reserved slip casting hole location and is carried out slip casting, Grouting Pipe selects Φ 30mm seamless steel
Pipe Grouting Pipe, 1m are a section.First row Grouting Pipe is oliquely downward inserted into the soil body from injected hole with 45 ° of direction, reaches design and freezes
Tie the position of bottom range.Second row and third row's Grouting Pipe are oliquely downward inserted into the soil body from injected hole with 60 ° of direction.?
The Grouting Pipe design reinforcement depth that third arranges injected hole arrangement is 8m, and point 8 section Grouting Pipes, each slip casting depth is 1m, that is, is segmented
Slip casting is inserted into 1m Grouting Pipe every time, next section Grouting Pipe is inserted into after slip casting；It is set in the Grouting Pipe of second row injected hole arrangement
Meter reinforcement depth is 8m, point 8 section Grouting Pipes, segmenting slip casting；First row injected hole arrangement Grouting Pipe design reinforcement depth 5m,
Divide 5 section Grouting Pipes, segmenting slip casting.
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump.Grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry.Cement slurry and water glass solution volume ratio are as follows: 1:0.25, wherein the cement slurry ratio of mud
For 1:0.8, concentration of sodium silicate is 30Be ', and grouting pressure 0.8MPa, flow rate of grouting control is in 1.5m3/h。
D. slip casting principle and method, the injected hole slip casting of the first section of jurisdiction in left line service channel two sides of the bottom, left line are whole
After slip casting, then in right line slip casting.Pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle.Section by section according to projected depth
Slip casting.Injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second
The injected hole at row both ends starts slip casting, is then successively perfused to intermediate injected hole.Then from the intermediate injected hole of third row to
The injected hole slip casting at both ends.
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil.
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, starts frozen construction, keeps minimum salt water temperature
- 30~-28 DEG C of degree, until design frozen region reinforces and completes.
Embodiment 4
Wuxi Metro Connection Passage, locating soil layer are miscellaneous fill layer, silty clay layer, silty sand ground, powder from top to bottom
Matter clay layer, silty sand ground, silty clay layer.Stratum locating for service channel is that silty clay presss from both sides powder soil horizon.Service channel buried depth
18m, clear span are designed as 2.50m, clear height 2.75m.Reinforcing engineering is added using service channel bottom pre-pouring grout+horizontal freezing joint
Gu.It is required according to designer, service channel reinforcement depth is 6m.
For this engineering using thaw collapse technology after contact bottom pre-pouring grout control work, specific technical solution is as follows:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Each 3, totally 6, right line.Service channel two sides are equipped with three rows in the part in service channel bottom design freezing range
Injected hole, first row and tunnel centerlines are 30 °, arrange 7 injected holes, spacing 50cm；Second row and tunnel center line
Angle is 45 °, arranges 7 injected holes, spacing 50cm；Third row is 60 ° with tunnel centerlines, arranges 7 injected holes,
Spacing is 50cm；Spacing between first row and second row is 80cm, and the spacing between second row and third row is 80cm.
B. Grouting Pipe is arranged, is pierced Grouting Pipe to reserved slip casting hole location and is carried out slip casting, Grouting Pipe selects Φ 30mm seamless steel
Pipe Grouting Pipe, 1m are a section.First row Grouting Pipe is oliquely downward inserted into the soil body from injected hole with 45 ° of direction, reaches design and freezes
Tie the position of bottom range.Second row and third row's Grouting Pipe are oliquely downward inserted into the soil body from injected hole with 60 ° of direction.?
The Grouting Pipe design reinforcement depth that third arranges injected hole arrangement is 8m, and point 8 section Grouting Pipes, each slip casting depth is 1m, that is, is segmented
Slip casting is inserted into 1m Grouting Pipe every time, next section Grouting Pipe is inserted into after slip casting；It is set in the Grouting Pipe of second row injected hole arrangement
Meter reinforcement depth is 6m, point 6 section Grouting Pipes, segmenting slip casting；First row injected hole arrangement Grouting Pipe design reinforcement depth 6m,
Divide 6 section Grouting Pipes, segmenting slip casting.
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump.Grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry.Cement slurry and water glass solution volume ratio are as follows: 1:0.5, wherein the cement slurry ratio of mud be
1:1, concentration of sodium silicate are 50Be ', and grouting pressure 0.3MPa, flow rate of grouting control is in 1.8m3/h。
D. slip casting principle and method, the injected hole slip casting of the first section of jurisdiction in left line service channel two sides of the bottom, left line are whole
After slip casting, then in right line slip casting.Pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle.Section by section according to projected depth
Slip casting.Injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second
The injected hole at row both ends starts slip casting, is then successively perfused to intermediate injected hole.Then from the intermediate injected hole of third row to
The injected hole slip casting at both ends.
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil.
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, starts frozen construction, keeps minimum salt water temperature
- 30~-28 DEG C of degree, until design frozen region reinforces and completes.
Embodiment 5
Changzhou Metro Connection Passage, locating soil layer are fill stratum, clay layer, silty clay layer, flour sand from top to bottom
Powder soil horizon, silty sand ground are pressed from both sides, sandy silt presss from both sides silty clay layer.Stratum locating for service channel is that sandy silt presss from both sides farinose argillic horizon.
Service channel buried depth 14m.Reinforcing engineering uses service channel bottom pre-pouring grout+horizontal freezing joint reinforcement.According to designer
It is required that service channel reinforcement depth is 7m.
For this engineering using thaw collapse technology after contact bottom pre-pouring grout control work, specific technical solution is as follows:
A. injected hole is arranged, left in service channel two sides using the section of jurisdiction of reserved injected hole when shield driving splices section of jurisdiction
Each 3, totally 6, right line.Service channel two sides are equipped with three rows in the part in service channel bottom design freezing range
Injected hole, first row and tunnel centerlines are 20 °, arrange 6 injected holes, spacing 50cm；Second row and tunnel center
Wire clamp angle is 55 °, arranges 6 injected holes, spacing 50cm；Third row is 75 ° with tunnel centerlines, arranges 6 slip castings
Hole, spacing 50cm；Spacing between first row and second row is 50cm, and the spacing between second row and third row is 50cm.
B. Grouting Pipe is arranged, is pierced Grouting Pipe to reserved slip casting hole location and is carried out slip casting, Grouting Pipe selects Φ 25mm seamless steel
Pipe Grouting Pipe, 1m are a section.First row Grouting Pipe is oliquely downward inserted into the soil body from injected hole with 45 ° of direction, reaches design and freezes
Tie the position of bottom range.Second row and third row's Grouting Pipe are oliquely downward inserted into the soil body from injected hole with 60 ° of direction.?
The Grouting Pipe design reinforcement depth that third arranges injected hole arrangement is 7m, and point 7 section Grouting Pipes, each slip casting depth is 1m, that is, is segmented
Slip casting is inserted into 1m Grouting Pipe every time, next section Grouting Pipe is inserted into after slip casting；It is set in the Grouting Pipe of second row injected hole arrangement
Meter reinforcement depth is 7m, point 7 section Grouting Pipes, segmenting slip casting；First row injected hole arrangement Grouting Pipe design reinforcement depth 5m,
Divide 5 section Grouting Pipes, segmenting slip casting.
C. injecting paste material and parameter, grouting equipment select BW250 type speed change grouting pump.Grouting serous fluid is with cement-sodium silicate
Based on dual slurry, supplemented by single liquid cement slurry.Cement slurry and water glass solution volume ratio are as follows: 3:1, wherein the cement slurry ratio of mud is 1:
1.25, concentration of sodium silicate is 35Be ', and grouting pressure 0.6MPa, flow rate of grouting control is in 1.6m3/h。
D. slip casting principle and method, the injected hole slip casting of the first section of jurisdiction in left line service channel two sides of the bottom, left line are whole
After slip casting, then in right line slip casting.Pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle.Section by section according to projected depth
Slip casting.Injected hole among slip casting Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second
The injected hole at row both ends starts slip casting, is then successively perfused to intermediate injected hole.Then from the intermediate injected hole of third row to
The injected hole slip casting at both ends.
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine and adds
Oil.
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, starts frozen construction, keeps minimum salt water temperature
- 30~-28 DEG C of degree, until design frozen region reinforces and completes.
Claims (8)
1. service channel bottom pre-pouring grout system, which is characterized in that design freezing range of the system in service channel bottom
(9) at least 1 row's injected hole, and every row's injected hole at least 1 are equipped in, the insertion into design freezing range (9) from injected hole
The angle of Grouting Pipe, every row's injected hole and tunnel center line is 10 ° -80 °, the angle of Grouting Pipe and tunnel center line is 15 ° -
75°。
2. service channel bottom pre-pouring grout system according to claim 1, which is characterized in that the injected hole is 3 rows, point
It Wei not the first injected hole (1), the second injected hole (2) and third injected hole (3).
3. service channel bottom pre-pouring grout system according to claim 2, which is characterized in that the first injected hole (1) and tunnel
The angle of road center line is 15 °, and the angle of the second injected hole (2) and tunnel center line is 30 °, third injected hole (3) and tunnel
The angle of center line is 60 °.
4. service channel bottom pre-pouring grout system according to claim 2 or 3, which is characterized in that the first injected hole (1),
Spacing ratio between spacing between second injected hole (2) and the second injected hole (2), third injected hole (3) is 1:2-1:0.8.
5. service channel bottom pre-pouring grout system according to claim 2 or 3, which is characterized in that every row's injected hole has 7
It is a, and be arranged symmetrically along service channel center line (7).
6. service channel bottom pre-pouring grout system according to claim 2 or 3, which is characterized in that with the first injected hole
(1), the second injected hole (2) and the corresponding Grouting Pipe of third injected hole (3) are respectively the first Grouting Pipe (4), the second Grouting Pipe (5)
With third Grouting Pipe (6), wherein the angle of the first Grouting Pipe (4) and tunnel center line is 45 °, the second Grouting Pipe (5) and third
The angle of Grouting Pipe (6) and tunnel center line is 60 °.
7. service channel bottom pre-pouring grout system according to claim 6, which is characterized in that the first Grouting Pipe (4), second
Grouting Pipe (5) and third Grouting Pipe (6) are merogenesis Grouting Pipe, and the ratio between slip casting depth is 1:2:2.
8. the method for thaw collapse after claim 1-3,6 any service channel bottom pre-pouring grout system control freezing constructions,
It is characterized in that comprising the steps of:
A. injected hole is arranged, when shield driving splices section of jurisdiction, in service channel two sides using the section of jurisdiction of reserved injected hole, left and right line
It is symmetrical arranged；
B. Grouting Pipe is arranged, pierces Grouting Pipe from reserved slip casting hole location, carries out slip casting, the setting of Grouting Pipe merogenesis；
C. injecting paste material and parameter, grouting serous fluid is based on cement-sodium silicate double liquid, supplemented by single liquid cement slurry, grouting pressure
For 0.2-0.8MPa, flow rate of grouting is controlled in 1.0-2.0m3/h；
D. slip casting principle and mode, first in the injected hole slip casting of left line service channel two sides of the bottom section of jurisdiction, left line whole slip casting is complete
Bi Hou, then in right line slip casting, pre-pouring grout follows a small amount of, multiple, multiple spot, uniform principle, according to projected depth slip casting section by section, note
Injected hole among slurry Shi Xiancong first row starts slip casting, is then successively perfused to the injected hole at both ends；Again from second row both ends
Injected hole start slip casting, be then successively perfused to intermediate injected hole, then from the intermediate injected hole of third row to both ends
Injected hole slip casting；
E. it arranges Freezing Station, equipment, piping connection, heat preservation and test instrumentation is installed, dissolve calcium chloride and unit fills fluorine oiling；
F. after slip casting is completed, sealing of hole is carried out with hydrophilic epoxy resin concrete, starts frozen construction after maintenance, keeps minimum salt water
Temperature -30~-28 DEG C, until design frozen region reinforces and completes.
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