CN104963334A - Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing - Google Patents

Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing Download PDF

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CN104963334A
CN104963334A CN201510407722.3A CN201510407722A CN104963334A CN 104963334 A CN104963334 A CN 104963334A CN 201510407722 A CN201510407722 A CN 201510407722A CN 104963334 A CN104963334 A CN 104963334A
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pipe
freezing
grouting
slip casting
construction
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CN104963334B (en
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杨平
张婷
何冬
何文龙
陈斌
丁顺良
王升福
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Nanjing Forestry University
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Nanjing Forestry University
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Abstract

The invention relates to a construction method for utilizing a grouting freezing pipe to reinforce and freeze a contact passage to restrain frost heaving and thaw collapsing. A freezing pipe is used as a grouting pipe simultaneously, the grouting freezing pipe is characterized by being composed of the grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I is composed of 3-6 sections, a drill bit III is installed at the pipe end of the first section, and the two sides of a pipe body are each provided with a one-way valve IV; the liquid supply pipe II is formed by two steel pipes in a crossed and welded mode, a certain amount of cement paste is added into and mixed with the soil body to improve physical and mechanical properties of the soil body, and the influence of frost heaving and thaw collapsing on surrounding strata and buildings can be restrained when contact passage freezing reinforcement is conducted. The construction method comprises the steps of construction preparation, positioning and drilling, grouting, liquid supply pipe installation, refrigerating system installation and freezing by starting a machine after maintenance. The construction method has the advantages that the cement soil is utilized for reinforcement, the strength of the soil body is further strengthened, the anti-permeability and the self-stability capacity of the soil body and the water stop performance of the contact passage strata are enhanced, groundwater seepage is effectively controlled, and the safety of later excavation and construction is improved.

Description

The construction method freezing service channel check frost heave thaw collapse is reinforced with slip casting freezing pipe
Technical field
The present invention relates to a kind of slip casting freezing pipe and reinforce the construction method freezing service channel check frost heave thaw collapse.This engineering method by doing Grouting Pipe by double for freezing pipe, is mixed a certain amount of cement paste thus improves the physico-mechanical properties of the soil body in the soil body, and when can suppress service channel consolidation by freezing, frozen swell and melt settlement is on the impact of surrounding formation and building.
Background technology
There is soft layer on a large scale in the nearly river such as Ningbo, Shanghai and Nanjing, Haiti district, soil strength is lower, and water content is higher.In underground engineering construction process, need to take into account subside, many-sided problem such as water burst, wherein the reinforcement of service channel is crucial.Engineering with artificial freezing method and cement-soil reinforcing method are all in daily use in engineering, cut both ways.
Freezing process utilizes manual pipe jacking Refrigeration Technique, the water in stratum is build-up ice, natural ground is become frozen soil, increase its strength and stability, and contacting of isolated underground water and underground construction, so that under the protection of frost wall, carries out underground construction driving and masonry construction.It has can form frozen soil wall under extremely complicated engineering geology and hydrogeological conditions, be not subject to the restriction of supporting scope and the supporting degree of depth, have the advantages such as strict water proofing property and nonstaining property.
But after engineering with artificial freezing method construction, surrounding formation is made to produce frost heave, thaw collapse phenomenon, concerning surrounding environment, the engineering properties of soil and adjacent building are adversely affected, as caused foundation instability, make adjacent structure produce inclinations, crack, serious time can cause the accidents such as building collapse, or make the adverse consequences such as underground utilities generation destruction.
After service channel frozen construction terminates, the mode of the general employing frost free period tracking grouting filling soil body controls stratum settlement, the selected of slip casting position relies on engineering experience mostly, grouting amount is only according to Ground Subsidence Monitoring every day, the controllability of engineering is poor, is difficult to control completely thaw collapse after the work of soft soil layer; Due to thaw collapse, to affect the cycle longer, and during slip casting in early stage not in place often causes metro operation, upper and lower line produces differential settlement, causes serious potential safety hazard.
The mode forming cement-soil induration at present in soil uses slip casting method, deep-mixed pile and high-pressure rotary spraying method.This engineering method adopts slip casting method wherein.
Slip casting method cementitious materials is mixed with slurries and injects the loose construction method making it solidify containing sand or water bearing ground, the rock stratum containing crack, solution cavity, zone of fracture.After slurries setting and harden, play cementing, ponding, make stratum firmly and cut off water source, to ensure smooth construction.
In actual underground construction, for improving the validity of ground stabilization, comprehensive engineering with artificial freezing method and cement-soil reinforcing method carry out simultaneously sometimes.As in metro tunnel excavation process, shield end start with receive, the construction of service channel often reinforces inefficacy because of cement-soil and goes wrong, and at this moment can freezing process be taked again once to supplement reinforcing; Run into that risk is comparatively large, strata condition is complicated or around building requirement sedimentation very little time, first carry out basement process with cement-soil reinforcing method, on established cement-soil basis, carry out engineering with artificial freezing method construction more afterwards.
Summary of the invention
Use engineering with artificial freezing method and cement-soil reinforcing method to carry out ground simultaneously and strengthen there is very important advantage: cement-soil improves the physico-mechanical properties of ground, when carrying out engineering with artificial freezing method construction on this basis, the freeze-thaw damage of generation is suppressed.Avoid the later stage because of condition do not allow to cause slip casting not in place, not in time, cause soft soil layer UNICOM road and tunnel structure during runing, to produce differential settlement, problems of crack.
A kind of slip casting freezing pipe is the object of the present invention is to provide to reinforce the construction method freezing service channel check frost heave thaw collapse.By using this engineering method, can control at 5mm by stratum settlement amount, thaw collapse influence basin controls at about 24m.
The object of the invention is to be achieved through the following technical solutions:
A kind of slip casting freezing pipe, is characterized in that this slip casting freezing pipe is made up of Grouting Pipe I and feed pipe II, and wherein Grouting Pipe I is made up of 3 ~ 6 joints, and Section 1 pipe end is equipped with drill bit III, and an one way valve IV is respectively arranged in pipe shaft both sides; Feed pipe II is made up of two steel pipe cross welds.
Described a kind of slip casting freezing pipe, it is characterized in that described Grouting Pipe I is Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 length is 1m, and follow-up each joint length is 1.5m.
Described a kind of slip casting freezing pipe, it is characterized in that described feed pipe II is Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, one of them steel pipe length 2 ~ 8m, another steel pipe length 0.5m, be welded on a side of 2 ~ 8m steel pipe front end.
Use described slip casting freezing pipe to reinforce the construction method freezing service channel check frost heave thaw collapse, it is characterized in that construction sequence is as follows:
A, preparation of construction, obstruction in cleaning tunnel, builds construction operation platform; Connect supply line, construct power supply to meet freezing system and excavation in drilling construction, tunnel; Lay pipeline to Freezing Method for Cross-passage Construction work plane, drill for position, hole and freeze running and supply water and blowdown; Check cement quality, rig service behaviour and the intact degree of measuring equipment;
B, locating holes, take secondary hole opening technology, according to position, position, hole, deflection, the degree of depth; Driller insertion, selects MD-60 rig, and control torque 2KN/m, thrust 17KN carry out position, hole and be drilled with;
After c, perforate, Grouting Pipe is pierced to position, pre-pouring grout hole and carries out slip casting, Grouting Pipe selects Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 Grouting Pipe length is 1m, and follow-up Grouting Pipe is a joint with 1.5m, and first joint Grouting Pipe pipe end and pipe shaft install one way valve slip casting, one-way valve opens pressure between 0.3 ~ 0.5MPa, according to projected depth slip casting section by section;
D, grouting parameter, for soft soil layer, cement grout proportioning selects 10%, for the service channel (buried depth≤20m) of normal buried depth, grouting pressure 0.4 ~ 0.5MPa is controlled, if time service channel buried depth comparatively dark (20m < buried depth≤40m), strengthen grouting pressure to 0.8 ~ 1.0Mpa in slip casting process, guarantee slurries diffusion evenly, control slip casting radius at 1.8m ~ 2.0m; Grouting amount controls according to undisturbed soil space when boring procedure soil erosion amount, and it is more suitable that slurries finally fill undisturbed soil 50% ~ 60% space;
E, rotation Grouting Pipe, guarantee that cement paste fully mixes with soil, suppress after slip casting to Grouting Pipe, get rid of unnecessary slurries, in Grouting Pipe, then settle feed pipe as follow-up freezing pipe use, and with sponge or foamed plastic shutoff aperture, in case slurries leak outside;
F, mobile drill are to position, next hole, and position, hole is drilled with and adopts interval to drill method, and repeats step 2-5, until all injected hole slip casting is complete;
G, drilling sequences, be preferentially drilled with service channel base apertures position, then to service channel top-portion apertures position, is finally service channel two side holes position, and service channel two side holes position is drilled with can carry out simultaneously;
H, do not do grouting hole and directly arrange freezing pipe, sequence of construction is: bottom locating holes and orifice tube installation → port seal installation → boring → measurement → blind hole → and bulge test.
Refrigeration system is freezed in i, installation, arranges thermometer hole, relief hole, connecting line, installs heat-preserving equipment, test instrumentation, dissolves calcium chloride and fill fluorine to unit to refuel;
J, maintenance 14 days after last hole slip casting completes, start frozen construction, keep minimum brine temp-28 ~-30 DEG C, until design frozen region has reinforced.
Beneficial effect
This slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse, compares existing engineering method, has following beneficial effect:
1, all current existing engineering machinery is used, workable;
2, engineering with artificial freezing method further enhances the intensity of the soil body on cement-soil reinforcing method basis, and the soil body is reinforced, and impervious and self-stability ability strengthens;
3, service channel stratum sealing strengthens, and effectively can control seepage action of ground water, reduces high water head pressure influence, and the increase later stage excavates the safety of constructing;
4, cement-soil stratum consolidation effectively can suppress the thaw collapse of frozen ground around and the impact on surrounding building, structure thereof;
5, cement soil improvement is carried out in advance, avoiding the later stage does not allow to cause slip casting not in place, not in time because of condition, soft soil layer UNICOM road and tunnel structure is caused to produce differential settlement during runing, problems of crack, and strengthen the later stage supplement slip casting controllability and reduce the slip casting cycle in later stage, cement use amount can be saved, reduce engineering time and manpower, machine cost.
Accompanying drawing explanation
Fig. 1 is slip casting freezing pipe schematic diagram,
Fig. 2 is service channel cement-soil reinforcing order and stabilization zone schematic diagram,
Reference numeral: I-Grouting Pipe, II-feed pipe, III-drill bit, IV-one way valve, V-service channel external boundary VI-freezing hole position (43 ~ 54) VII-slip casting freezing hole position (1 ~ 42) VIII-drilling sequences number (1 ~ 54).
Detailed description of the invention
Embodiment 1: a kind of slip casting freezing pipe
Ningbo Metro Connection Passage, it is plain fill from top to down that its place geology rises on ground, and silty sand ground, silty clay layer, the stratum of shield crossing is mainly silty clay layer.Service channel buried depth 27.6m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 8.5m.
1, a slip casting freezing pipe, length is 8.5m, it is characterized in that this slip casting freezing pipe is made up of Grouting Pipe I and feed pipe II, and wherein Grouting Pipe I is made up of 6 joints, and Section 1 pipe end is equipped with drill bit III, and an one way valve IV is respectively arranged in pipe shaft both sides; Feed pipe II is made up of two steel pipe cross welds.
2, described a kind of slip casting freezing pipe, it is characterized in that described Grouting Pipe I is Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 length is 1m, and follow-up each joint length is 1.5m.
3, described a kind of slip casting freezing pipe, it is characterized in that described feed pipe II is Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, one of them steel pipe length 8.0m, another steel pipe length 0.5m, be welded on a side of 8m steel pipe front end.
Embodiment 2: a kind of slip casting freezing pipe
Suzhou subway No. 3 line service channels, it is plain fill from top to down that its place geology rises on ground, silty clay layer, flour sand alternation of bed, Extra-fine sand.The stratum of shield crossing is mainly fine sand layer.Service channel buried depth 15.2m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 4m.
A kind of slip casting freezing pipe, length is respectively 4m, it is characterized in that this slip casting freezing pipe is made up of Grouting Pipe I and feed pipe II, and wherein Grouting Pipe I is made up of 3 joints, and Section 1 pipe end is equipped with drill bit III, and an one way valve IV is respectively arranged in pipe shaft both sides; Feed pipe II is made up of two steel pipe cross welds.
2, described a kind of slip casting freezing pipe, it is characterized in that described Grouting Pipe I is Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 length is 1m, and follow-up each length is 1.5m.
3, described a kind of slip casting freezing pipe, it is characterized in that described feed pipe II is Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, one of them steel pipe length 3.5m, another steel pipe length 0.5m, be welded on a side of 3.5m steel pipe front end.
Embodiment 3: a kind of slip casting freezing pipe
Ningbo subway service channel, it is plain fill from top to down that its place geology rises on ground, silty clay layer, fine sand layer.The stratum of shield crossing is mainly fine sand layer.Service channel buried depth 21.8m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 7m.
A kind of slip casting freezing pipe, length is respectively 7m, it is characterized in that this slip casting freezing pipe is made up of Grouting Pipe I and feed pipe II, and wherein Grouting Pipe I is made up of 5 joints, and Section 1 pipe end is equipped with drill bit III, and an one way valve IV is respectively arranged in pipe shaft both sides; Feed pipe II is made up of two steel pipe cross welds.
2, described a kind of slip casting freezing pipe, it is characterized in that described Grouting Pipe I is Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 length is 1m, and follow-up each joint length is 1.5m.
3, described a kind of slip casting freezing pipe, it is characterized in that described feed pipe II is Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, one of them steel pipe length 6.5m, another steel pipe length 0.5m, be welded on a side of 6.5m steel pipe front end.
Embodiment 4: a kind of slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse
Ningbo Metro Connection Passage, it is plain fill from top to down that its place geology rises on ground, and silty sand ground, silty clay layer, the stratum of shield crossing is mainly silty clay layer.Service channel buried depth 27.6m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 8.5m.
Slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse, and its construction sequence is as follows:
1, preparation of construction, obstruction in cleaning tunnel, builds construction operation platform; Connect supply line, construct power supply to meet freezing system and excavation in drilling construction, tunnel; Lay pipeline to Freezing Method for Cross-passage Construction work plane, drill for position, hole and freeze running and supply water and blowdown; Check cement quality, rig service behaviour and the intact degree of measuring equipment;
2, locating holes, with transit and compass determination perforate inclination angle and azimuth, accurately makes position, perforate hole, direction, and helps to layout in tunnel two, adopts secondary hole opening technology, and with stringing method verification, direction, control hole position; Driller insertion, selects MD-60 rig, adjustment rig position, and control torque 2KN/m, thrust 17KN carry out position, No. 1 hole and be drilled with;
3, Grouting Pipe is pierced to position, No. 1 hole and carry out slip casting, Grouting Pipe selects Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, first segment Grouting Pipe length is 1m, pipe end installs one way valve slip casting, one-way valve opens pressure between 0.3 ~ 0.5MPa, according to projected depth 8.5m, follow-up each joint slip casting pipe range 1.5m, slip casting section by section;
4, cement grout proportioning selects 10%, controls grouting pressure 0.8 ~ 1.0MPa in slip casting process, and control slip casting radius at 2.0m, grouting amount controls according to undisturbed soil space when boring procedure soil erosion amount, and slurries finally fill undisturbed soil 50% ~ 60% space;
5, rotate Grouting Pipe, guarantee that cement paste fully mixes with soil, the complete feed pipe of settling in Grouting Pipe of slip casting is used as follow-up freezing pipe, feed pipe adopts Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, with sponge or foamed plastic shutoff aperture, in case slurries leak outside;
6, position, mobile drill to 2 hole, position, hole is drilled with and adopts interval to drill method (detailed bored grouting order as shown in Figure 2), repeats step 2-6, until cement-soil reinforcing area has been constructed;
7, drilling sequences, preferentially service channel base apertures position (number 1 ~ hole, hole number 17) is drilled with, then to service channel top-portion apertures position (number 18 ~ hole, hole number 34), be finally service channel two side holes position (number 35 ~ hole, hole number 42), service channel two side holes position is drilled with can carry out simultaneously;
8, arrange freezing pipe, according to freezing curtain design, freeze hole count 54, service channel top and bottom each hole column pitch 0.7m, each side hole column pitch 0.6m; Injected hole use is not done in number 43 ~ hole, hole numbers 54, directly installs freezing pipe; Sequence of construction is: bottom locating holes and orifice tube installation → port seal installation → boring → measurement → blind hole → and bulge test.
9, refrigeration system is freezed in installation, synchronously can install refrigeration system, save time in bored grouting process; Freeze station equipment and mainly comprise YSLGF300 II type Screw chiller 2 (for subsequent use), its maximum cooling capacity is about 87500kcal/h, freezing unit motor general power 110kw; IS150-125-250 salt water circulating pump 2 (1 is for subsequent use), flow 200m3/h, lift 30m, motor general power 30kw; IS150-125-250 cooling water circulating pump 1, flow 200m3/h, lift 30m, motor general power 30kw; Cooling tower 2, motor general power 6kw; Brine tank one, volume 6m3; Connecting line, installation heat-preserving equipment and test instrumentation afterwards, salt water conduit tube and collection liquid distribution pipe all adopt Φ 159 × 5mm seamless steel pipe, and collection, liquid distribution pipe are connected with goat's horn selects Φ 1.5 " high-pressure rubber pipe; Cooling water pipe Φ 5 " welded tube; Freezing plate Φ 1.5 " pipe processing; Mounting temperature sensor on refrigerator water inlet pipe and water outlet pipe, setting pressure, temperature pick up and by-pass valve control going, on the Brine Pipe of loop, install flow meter in Brine Pipe outlet, install liquid level sensor at brine tank; Mounted valve two between brine distributing ring and frigo, so that control freezing device brine flow; In the eminence of saline line, vent valve is installed; Outlet salt water conduit tube installs one way valve; Salt solution and clear water pipeline is withstand voltage is respectively 0.7Mpa and 0.3MPA; Treat all to install, dissolve calcium chloride and fill fluorine to unit and refuel, salt solution proportion is 1.26 ~ 1.27;
10, start frozen construction until last injected hole maintenance after 14 days, positive freeze-off time is 40 days, keeps minimum brine temp-30 DEG C ~-28 DEG C, until frozen region has reinforced; Excavation enters maintenance and freezes the stage subsequently, keeps brine temp at about-28 DEG C, until service channel main structure construction is complete.
Embodiment 5: a kind of slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse
Suzhou subway No. 3 line service channels, it is plain fill from top to down that its place geology rises on ground, silty clay layer, flour sand alternation of bed, Extra-fine sand.The stratum of shield crossing is mainly fine sand layer.Service channel buried depth 15.2m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 4.0m.
Slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse, and its construction sequence is as follows:
1, preparation of construction, obstruction in cleaning tunnel, builds construction operation platform; Connect supply line, construct power supply to meet freezing system and excavation in drilling construction, tunnel; Lay pipeline to Freezing Method for Cross-passage Construction work plane, drill for position, hole and freeze running and supply water and blowdown; Check cement quality, rig service behaviour and the intact degree of measuring equipment;
2, locating holes, with transit and compass determination perforate inclination angle and azimuth, accurately makes position, perforate hole, direction, and helps to layout in tunnel two, adopts secondary hole opening technology, and with stringing method verification, direction, control hole position; Driller insertion, selects MD-60 rig, adjustment rig position, and control torque 2KN/m, thrust 17KN carry out position, No. 1 hole and be drilled with;
3, Grouting Pipe is pierced to position, No. 1 hole and carry out slip casting, Grouting Pipe selects Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, first segment Grouting Pipe length is 1m, pipe end installs one way valve slip casting, one-way valve opens pressure between 0.3 ~ 0.5MPa, according to projected depth 4.0m, follow-up each joint slip casting pipe range 1.5m, slip casting section by section;
4, cement grout proportioning selects 10%, controls grouting pressure 0.4 ~ 0.5MPa in slip casting process, and controlling slip casting radius is 1.8m, and grouting amount controls according to undisturbed soil space when boring procedure soil erosion amount, and slurries finally fill undisturbed soil 50% ~ 60% space;
5, rotate Grouting Pipe, guarantee that cement paste fully mixes with soil, the complete feed pipe of settling in Grouting Pipe of slip casting is used as follow-up freezing pipe, feed pipe adopts Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, with sponge or foamed plastic shutoff aperture, in case slurries leak outside;
6, position, mobile drill to 2 hole, position, hole is drilled with and adopts interval to drill method (detailed bored grouting order as shown in Figure 2), repeats step 2-6, until cement-soil reinforcing area has been constructed;
7, drilling sequences, preferentially service channel base apertures position (number 1 ~ hole, hole number 17) is drilled with, then to service channel top-portion apertures position (number 18 ~ hole, hole number 34), be finally service channel two side holes position (number 35 ~ hole, hole number 42), service channel two side holes position is drilled with can carry out simultaneously;
8, arrange freezing pipe, according to freezing curtain design, freeze hole count 54, service channel top and bottom each hole column pitch 0.7m, each side hole column pitch 0.6m; Injected hole use is not done in number 43 ~ hole, hole numbers 54, directly installs freezing pipe; Sequence of construction is: bottom locating holes and orifice tube installation → port seal installation → boring → measurement → blind hole → and bulge test.
9, refrigeration system is freezed in installation, synchronously can install refrigeration system, save time in bored grouting process; Freeze station equipment and mainly comprise YSLGF300 II type Screw chiller 2 (for subsequent use), its maximum cooling capacity is about 84500kcal/h, freezing unit motor general power 110kw; IS150-125-250 salt water circulating pump 2 (1 is for subsequent use), flow 200m3/h, lift 30m, motor general power 30kw; IS150-125-250 cooling water circulating pump 1, flow 200m3/h, lift 30m, motor general power 30kw; Cooling tower 2, motor general power 8kw; Brine tank one, volume 6m3; Connecting line, installation heat-preserving equipment and test instrumentation afterwards, salt water conduit tube and collection liquid distribution pipe all adopt Φ 159 × 5mm seamless steel pipe, and collection, liquid distribution pipe are connected with goat's horn selects Φ 1.5 " high-pressure rubber pipe; Cooling water pipe Φ 5 " welded tube; Freezing plate Φ 1.5 " pipe processing; Mounting temperature sensor on refrigerator water inlet pipe and water outlet pipe, setting pressure, temperature pick up and by-pass valve control going, on the Brine Pipe of loop, install flow meter in Brine Pipe outlet, install liquid level sensor at brine tank; Mounted valve two between brine distributing ring and frigo, so that control freezing device brine flow; In the eminence of saline line, vent valve is installed; Outlet salt water conduit tube installs one way valve; Salt solution and clear water pipeline is withstand voltage is respectively 0.7Mpa and 0.3MPA; Treat all to install, dissolve calcium chloride and fill fluorine to unit and refuel, select N46 refrigerator oil, R22 cold-producing medium, saline solution proportion is 1.27;
10, start frozen construction until last injected hole maintenance after 14 days, positive freeze-off time is 40 days, keeps minimum brine temp-30 DEG C ~-28 DEG C, until frozen region has reinforced; Excavation enters maintenance and freezes the stage subsequently, keeps brine temp at about-28 DEG C, until service channel main structure construction is complete.
Embodiment 6: a kind of slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse
Ningbo subway service channel, it is plain fill from top to down that its place geology rises on ground, silty clay layer, fine sand layer.The stratum of shield crossing is mainly fine sand layer.Service channel buried depth 21.8m, stabilization works adopts cement-soil reinforcing+horizontal freezing joint reinforcement.According to designing requirement, service channel reinforcement depth is 7m.
Slip casting freezing pipe reinforces the construction method freezing service channel check frost heave thaw collapse, and its construction sequence is as follows:
1, preparation of construction, obstruction in cleaning tunnel, builds construction operation platform; Connect supply line, construct power supply to meet freezing system and excavation in drilling construction, tunnel; Lay pipeline to Freezing Method for Cross-passage Construction work plane, drill for position, hole and freeze running and supply water and blowdown; Check cement quality, rig service behaviour and the intact degree of measuring equipment;
2, locating holes, with transit and compass determination perforate inclination angle and azimuth, accurately makes position, perforate hole, direction, and helps to layout in tunnel two, adopts secondary hole opening technology, and with stringing method verification, direction, control hole position; Driller insertion, selects MD-60 rig, adjustment rig position, and control torque 2KN/m, thrust 17KN carry out position, No. 1 hole and be drilled with;
3, Grouting Pipe is pierced to position, No. 1 hole and carry out slip casting, Grouting Pipe selects Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, first segment Grouting Pipe length is 1m, pipe end installs one way valve slip casting, one-way valve opens pressure between 0.3 ~ 0.5MPa, according to projected depth 7.0m, follow-up each joint Grouting Pipe length is 1.5m, section by section slip casting;
4, cement grout proportioning selects 10%, controls grouting pressure 0.8 ~ 0.9MPa in slip casting process, and controlling slip casting radius is 1.9m, and grouting amount controls according to undisturbed soil space when boring procedure soil erosion amount, and slurries finally fill undisturbed soil 50% ~ 60% space;
5, rotate Grouting Pipe, guarantee that cement paste fully mixes with soil, the complete feed pipe of settling in Grouting Pipe of slip casting is used as follow-up freezing pipe, feed pipe adopts Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, with sponge or foamed plastic shutoff aperture, in case slurries leak outside;
6, position, mobile drill to 2 hole, position, hole is drilled with and adopts interval to drill method (detailed bored grouting order as shown in Figure 2), repeats step 2-6, until cement-soil reinforcing area has been constructed;
7, drilling sequences, preferentially service channel base apertures position (number 1 ~ hole, hole number 17) is drilled with, then to service channel top-portion apertures position (number 18 ~ hole, hole number 34), be finally service channel two side holes position (number 35 ~ hole, hole number 42), service channel two side holes position is drilled with can carry out simultaneously;
8, arrange freezing pipe, according to freezing curtain design, freeze hole count 54, service channel top and bottom each hole column pitch 0.7m, each side hole column pitch 0.6m; Injected hole use is not done in number 43 ~ hole, hole numbers 54, directly installs freezing pipe; Sequence of construction is: bottom locating holes and orifice tube installation → port seal installation → boring → measurement → blind hole → and bulge test.
9, refrigeration system is freezed in installation, synchronously can install refrigeration system, save time in bored grouting process; Freeze station equipment and mainly comprise YSLGF300 II type Screw chiller 2 (for subsequent use), its maximum cooling capacity is about 84500kcal/h, freezing unit motor general power 110kw; IS150-125-250 salt water circulating pump 2 (1 is for subsequent use), flow 200m3/h, lift 30m, motor general power 30kw; IS150-125-250 cooling water circulating pump 1, flow 200m3/h, lift 30m, motor general power 30kw; Cooling tower 2, motor general power 8kw; Brine tank one, volume 6m3; Connecting line, installation heat-preserving equipment and test instrumentation afterwards, salt water conduit tube and collection liquid distribution pipe all adopt Φ 159 × 5mm seamless steel pipe, and collection, liquid distribution pipe are connected with goat's horn selects Φ 1.5 " high-pressure rubber pipe; Cooling water pipe Φ 5 " welded tube; Freezing plate Φ 1.5 " pipe processing; Mounting temperature sensor on refrigerator water inlet pipe and water outlet pipe, setting pressure, temperature pick up and by-pass valve control going, on the Brine Pipe of loop, install flow meter in Brine Pipe outlet, install liquid level sensor at brine tank; Mounted valve two between brine distributing ring and frigo, so that control freezing device brine flow; In the eminence of saline line, vent valve is installed; Outlet salt water conduit tube installs one way valve; Salt solution and clear water pipeline is withstand voltage is respectively 0.7Mpa and 0.3MPA; Treat all to install, dissolve calcium chloride and fill fluorine to unit and refuel, select N46 refrigerator oil, R22 cold-producing medium, saline solution proportion is 1.27;
10, start frozen construction until last injected hole maintenance after 14 days, positive freeze-off time is 40 days, keeps minimum brine temp-30 DEG C ~-28 DEG C, until frozen region has reinforced; Excavation enters maintenance and freezes the stage subsequently, keeps brine temp at about-28 DEG C, until service channel main structure construction is complete.

Claims (4)

1. a slip casting freezing pipe, it is characterized in that this slip casting freezing pipe is made up of Grouting Pipe (I) and feed pipe (II), wherein Grouting Pipe (I) is made up of 3 ~ 6 joints, Section 1 pipe end is equipped with drill bit (III), and an one way valve (IV) is respectively arranged in pipe shaft both sides; Feed pipe (II) is made up of two steel pipe cross welds.
2. a kind of slip casting freezing pipe according to claim 1, it is characterized in that described Grouting Pipe (I) is for Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 length is 1m, and follow-up each joint length is 1.5m.
3. a kind of slip casting freezing pipe according to claim 1, it is characterized in that described feed pipe (II) is for Φ 45 × 3mm, 20# low-carbon (LC) seamless steel pipe, one of them steel pipe length 2 ~ 8m, another steel pipe length 0.5m, is welded on a side of 2 ~ 8m steel pipe front end.
4. use the slip casting freezing pipe described in claim 1 to reinforce the construction method freezing service channel check frost heave thaw collapse, it is characterized in that construction sequence is as follows:
A, preparation of construction, obstruction in cleaning tunnel, builds construction operation platform; Connect supply line, construct power supply to meet freezing system and excavation in drilling construction, tunnel; Lay pipeline to Freezing Method for Cross-passage Construction work plane, drill for position, hole and freeze running and supply water and blowdown; Check cement quality, rig service behaviour and the intact degree of measuring equipment;
B, locating holes, take secondary hole opening technology, according to position, position, hole, deflection, the degree of depth; Driller insertion, selects MD-60 rig, and control torque 2KN/m, thrust 17KN carry out position, hole and be drilled with;
After c, perforate, slip casting freezing pipe is pierced to position, pre-pouring grout hole and carries out slip casting, slip casting freezing pipe selects Φ 89 × 8mm, 20# low-carbon (LC) seamless steel pipe, Section 1 slip casting freezing pipe length is 1m, and follow-up Grouting Pipe is a joint with 1.5m, and Section 1 Grouting Pipe pipe end and pipe shaft install one way valve slip casting, one-way valve opens pressure between 0.3 ~ 0.5MPa, according to projected depth slip casting section by section;
D, grouting parameter, for soft soil layer, cement grout proportioning selects 10%, for the service channel (buried depth≤20m) of normal buried depth, grouting pressure 0.4 ~ 0.5MPa is controlled, if time service channel buried depth comparatively dark (20m < buried depth≤40m), strengthen grouting pressure to 0.8 ~ 1.0Mpa in slip casting process, guarantee slurries diffusion evenly, control slip casting radius at 1.8m ~ 2.0m; Grouting amount controls according to undisturbed soil space when boring procedure soil erosion amount, and it is more suitable that slurries finally fill undisturbed soil 50% ~ 60% space;
E, rotation slip casting freezing pipe, guarantee that cement paste fully mixes with soil, suppress after slip casting to Grouting Pipe, get rid of unnecessary slurries, in Grouting Pipe, then settle feed pipe as follow-up freezing pipe use, and with sponge or foamed plastic shutoff aperture, in case slurries leak outside;
F, mobile drill are to position, next hole, and position, hole is drilled with and adopts interval to drill method, and repeats step b-e, until all injected hole slip casting is complete;
G, drilling sequences, be preferentially drilled with service channel base apertures position, then to service channel top-portion apertures position, is finally service channel two side holes position, and service channel two side holes position is drilled with can carry out simultaneously;
H, do not do grouting hole and directly arrange freezing pipe, sequence of construction is: bottom locating holes and orifice tube installation → port seal installation → boring → measurement → blind hole → and bulge test.
Refrigeration system is freezed in i, installation, arranges thermometer hole, relief hole, connecting line, installs heat-preserving equipment, test instrumentation, dissolves calcium chloride and fill fluorine to unit to refuel;
J, maintenance 14 days after last hole slip casting completes, start frozen construction, keep minimum brine temp-28 ~-30 DEG C, until design frozen region has reinforced.
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107034874A (en) * 2017-03-06 2017-08-11 安徽理工大学 Double-screw type slip casting type freezing plant and construction method
CN107085085A (en) * 2017-03-06 2017-08-22 安徽理工大学 Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method
CN108179740A (en) * 2017-12-29 2018-06-19 湖北工业大学 A kind of construction method across solution cavity bored concrete pile
CN108798677A (en) * 2018-06-08 2018-11-13 中煤隧道工程有限公司 A kind of Metro Connection Passage method for rapidly thawing
WO2018206627A1 (en) 2017-05-11 2018-11-15 Vinci Construction Method and device for freezing a mass of soil
CN110820786A (en) * 2019-11-19 2020-02-21 青海省交通科学研究院 Deep foundation structure for preventing freeze-thaw diseases in permafrost region
CN110984239A (en) * 2020-01-06 2020-04-10 海南大学 Local reinforcement treatment method for preventing garbage factory seepage
CN111022059A (en) * 2019-12-24 2020-04-17 中交路桥建设有限公司 Freezing hole construction process
CN112726684A (en) * 2020-12-25 2021-04-30 中国矿业大学 Method for inhibiting frost heaving deformation of fiber-modified stratum

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08338016A (en) * 1995-06-13 1996-12-24 Seiken:Kk Method for freezing-expansion countermeasure construction
JP2001123439A (en) * 1999-10-27 2001-05-08 Kyokado Eng Co Ltd Grouting method for soil
CN102979083A (en) * 2012-11-08 2013-03-20 沈阳信达信息科技有限公司 Liquid nitrogen freezing device
CN103015402A (en) * 2012-12-27 2013-04-03 南京林业大学 Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method
CN203022003U (en) * 2013-01-06 2013-06-26 杨聪 Grouting freezing pipe with rotary control hole
CN203145846U (en) * 2013-01-06 2013-08-21 李立国 Grouting freezing tube with traction valve control
CN204780857U (en) * 2015-07-13 2015-11-18 南京林业大学 Pipe is freezed in slip casting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08338016A (en) * 1995-06-13 1996-12-24 Seiken:Kk Method for freezing-expansion countermeasure construction
JP2001123439A (en) * 1999-10-27 2001-05-08 Kyokado Eng Co Ltd Grouting method for soil
CN102979083A (en) * 2012-11-08 2013-03-20 沈阳信达信息科技有限公司 Liquid nitrogen freezing device
CN103015402A (en) * 2012-12-27 2013-04-03 南京林业大学 Construction method for inhibiting frost heaving and thaw collapse of horizontally frozen end through cement-soil reinforcement method
CN203022003U (en) * 2013-01-06 2013-06-26 杨聪 Grouting freezing pipe with rotary control hole
CN203145846U (en) * 2013-01-06 2013-08-21 李立国 Grouting freezing tube with traction valve control
CN204780857U (en) * 2015-07-13 2015-11-18 南京林业大学 Pipe is freezed in slip casting

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张婷等: "人工冻结法在地铁建设中的应用于发展", 《森林工程》 *
李文勇等: "冻结加固融沉注浆作用机理与应用技术", 《徐州工程学院学报》 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107085085A (en) * 2017-03-06 2017-08-22 安徽理工大学 Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method
CN107085085B (en) * 2017-03-06 2018-04-17 安徽理工大学 Hydro-thermal power THM coupling manual pipe jacking disturbed soil grouting test device and method
CN107034874B (en) * 2017-03-06 2019-01-25 安徽理工大学 Double-screw type slip casting type freezing plant and construction method
CN107034874A (en) * 2017-03-06 2017-08-11 安徽理工大学 Double-screw type slip casting type freezing plant and construction method
US11091893B2 (en) 2017-05-11 2021-08-17 Vinci Construction Method and device for freezing a mass of soil
US20200063391A1 (en) * 2017-05-11 2020-02-27 Vinci Construction Method and device for freezing a mass of soil
WO2018206627A1 (en) 2017-05-11 2018-11-15 Vinci Construction Method and device for freezing a mass of soil
FR3066204A1 (en) * 2017-05-11 2018-11-16 Vinci Construction METHOD AND DEVICE FOR FREEZING A SOIL SOLID
CN108179740A (en) * 2017-12-29 2018-06-19 湖北工业大学 A kind of construction method across solution cavity bored concrete pile
CN108798677A (en) * 2018-06-08 2018-11-13 中煤隧道工程有限公司 A kind of Metro Connection Passage method for rapidly thawing
CN110820786A (en) * 2019-11-19 2020-02-21 青海省交通科学研究院 Deep foundation structure for preventing freeze-thaw diseases in permafrost region
CN110820786B (en) * 2019-11-19 2021-04-23 青海大学 Deep foundation structure for preventing freeze-thaw diseases in permafrost region
CN111022059A (en) * 2019-12-24 2020-04-17 中交路桥建设有限公司 Freezing hole construction process
CN110984239A (en) * 2020-01-06 2020-04-10 海南大学 Local reinforcement treatment method for preventing garbage factory seepage
CN110984239B (en) * 2020-01-06 2021-08-24 海南大学 Local reinforcement treatment method for preventing garbage factory seepage
CN112726684A (en) * 2020-12-25 2021-04-30 中国矿业大学 Method for inhibiting frost heaving deformation of fiber-modified stratum

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Application publication date: 20151007

Assignee: Jiangsu Construction Engineering Consulting Co., Ltd.

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Contract record no.: X2019320000076

Denomination of invention: Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing

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