CN110397441A - Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer - Google Patents
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer Download PDFInfo
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- CN110397441A CN110397441A CN201910569745.2A CN201910569745A CN110397441A CN 110397441 A CN110397441 A CN 110397441A CN 201910569745 A CN201910569745 A CN 201910569745A CN 110397441 A CN110397441 A CN 110397441A
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- shield machine
- mud
- shuts down
- sand
- pressure chamber
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009412 basement excavation Methods 0.000 claims abstract description 25
- 238000010926 purge Methods 0.000 claims abstract description 14
- 229920003023 plastic Polymers 0.000 claims abstract description 11
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 33
- 229940080314 sodium bentonite Drugs 0.000 claims description 33
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 11
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 11
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 11
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 229940092782 bentonite Drugs 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 2
- 238000010348 incorporation Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 7
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- -1 quartzy sandstone Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/124—Helical conveying means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of sand-pebble layer of disclosure of the invention; shield machine technical field used in underground engineering; shield machine reduces the bed drain purge of spiral dumper before shutting down, while injecting modified mud until the sandy gravel accumulated in pressure chamber becomes Plastic Flow state or the simultaneously injecting compressed air into pressure chamber on pressure chamber and excavation face;Have the advantages that following three: (1) being conducive to that excavation face is maintained to stablize;(2) after modified mud and sandy gravel are stirred, it is modified to that there is good stream mecystasis to be deposited in pressure chamber with high-intensitive sandy gravel, it is not susceptible to isolate and be layered, also just can be avoided and stagnant row, failure of gushing occurs, improve construction efficiency;(3) modified mud injection pressure cabin also forms mud film easily in excavation face, avoids largely being modified mud or compressed air escape, facilitates stablizing for excavation face under long-time shutdown status and maintains.
Description
Technical field
The invention belongs to the shield machine technical fields used in underground engineering, and in particular to shield in a kind of sand-pebble layer
Structure machine shuts down pressure maintaining and prevents the control method of stagnant row.
Background technique
Since the beginning of this century, China coast, riverine main cities subway construction progress into climax.Ended for the end of the year 2017,
The city that acquisition National Development and Reform Committee approves the construction of subway has had reached 43, wherein not only including a wide deep equal line city of going up north
City, there are also many two or three lines cities.In terms of operating mileage, Shanghai has become the longest city of metro operation mileage in the world
City, Beijing are number two.Since China has a vast territory, complex geologic conditions, wherein Chengdu, Lanzhou, Dalian and Beijing all encounter
Large-scale sand-pebble layer, cobble content reach 40% or more.Since cobble head is big, content is high, intensity is high, mobility
Difference causes sandy gravel to be deposited in the pressure chamber of shield machine;After shield machine is shut down, it is easy to appear sandy gravel (containing cobble) isolation
Lead to stagnant row, again after starting up, isolation causes a large amount of mud and fine grained to be easy to gush and quickly take out of, does not arrange in time
Boulder and cobble out is then deposited in pressure chamber and spiral dumper, and retaining pressure cabin, even stuck spiral dumper can not be normal
Rotation, at this moment must just shut down processing, reduce so as to cause the digging efficiency of shield machine, extend the building time of subway.
Summary of the invention
In view of the above technical problems, pressure maintaining is shut down the present invention provides shield machine in a kind of sand-pebble layer and prevent stagnant row's
Control method.
The technical scheme adopted by the invention is as follows: shield machine shuts down pressure maintaining and prevents the control of stagnant row in a kind of sand-pebble layer
Method, shield machine reduce the bed drain purge of spiral dumper before shutting down, while the modified mud of injection is straight on pressure chamber and excavation face
The sandy gravel accumulated in pressure chamber becomes Plastic Flow state or the simultaneously injecting compressed air into pressure chamber.
It further limits, shuts down first 5~10 minutes bed drain purges for reducing spiral dumper in shield machine.
It further limits, the modified mud is mixed to form by high molecular polymer and sodium bentonite mud, and sodium base is swollen
Moistening the native swollen water ratio of mud is 1:(4~6), the Su Shi funnel viscosity of sodium bentonite mud is 25~50s, high molecular polymer
Mix 0.3~1.0% that quality is sodium bentonite quality of mud fluid.
It further limits, the high molecular polymer is carboxymethyl cellulose or polyacrylamide.
It further limits, the additional amount of the compressed air is greater than compressed air in the escape velocity of excavation face.
It further limits, the escape velocity is calculated using Geoslope Air module.
Geoslope Air module is air flow analysis software.
The invention has the benefit that the bed drain purge that (1) shuts down preceding spiral dumper makes sandy gravel pile with pressure chamber, stop
Pressure reduction amplitude is small after machine, is conducive to that excavation face is maintained to stablize;(2) after modified mud and sandy gravel are stirred, there is height
The sandy gravel of intensity is modified to that there is good stream mecystasis to be deposited in pressure chamber, is not susceptible to isolate and be layered,
It just can be avoided and stagnant row, failure of gushing occur, improve construction efficiency;(3) largely modified mud injection pressure cabin also easily exists
Mud film is formed in excavation face, is avoided largely being modified mud or compressed air escape, is facilitated excavation face under long-time shutdown status
Stablize maintain.
Detailed description of the invention
Fig. 1 is the structural schematic diagram at the pressure chamber and excavation face of shield machine.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It can be machine
Tool connection, is also possible to be electrically connected;It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
In description of the invention, what some structures or device were not described specifically, it is interpreted as being able to achieve in the prior art
Structure or device.
Embodiment 1
1. preparing modified mud
1.1 weigh carboxymethyl cellulose, by weight of carboxymethyl cellulose is the 0.3% of sodium bentonite quality of mud fluid
To sodium bentonite mud quality and weigh, and institute's water is calculated according to the mass ratio 1:4 of sodium bentonite mud and water
Amount, wherein the viscosity of sodium bentonite mud be 25s;
1.2 are mixed and stirred for carboxymethyl cellulose, sodium bentonite mud and water uniformly to obtain modified mud.
2. shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of sand-pebble layer, concrete operations are as follows:
Shield machine shuts down the first 5 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Embodiment 2
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of sand-pebble layer, and concrete operations are as follows:
S1: the air escape speed of excavation face is calculated using Geoslope Air module;
S2: into pressure chamber, shield machine shuts down the first 5 minutes bed drain purges for reducing spiral dumper, while injecting to pressure chamber
Compressed air becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber;Speed to pressure chamber injecting compressed air is big
In air escape speed, it is ensured that pressure is stablized.
Embodiment 3
1. preparing modified mud
1.1 weigh polyacrylamide, obtain sodium by weight of polyacrylamide is the 0.7% of sodium bentonite quality of mud fluid
It the quality of base bentonite mud and weighs, and calculates the amount of institute's water according to the mass ratio 1:5 of sodium bentonite mud and water,
Wherein the viscosity of sodium bentonite mud is 34s;
1.2 are mixed and stirred for polyacrylamide, sodium bentonite mud and water uniformly to obtain modified mud.
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of 2 sand-pebble layers, and concrete operations are as follows:
Shield machine shuts down the first 8 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Embodiment 4
1. preparing modified mud
1.1 weigh polyacrylamide, obtain sodium by weight of polyacrylamide is the 1.0% of sodium bentonite quality of mud fluid
It the quality of base bentonite mud and weighs, and calculates the amount of institute's water according to the mass ratio 1:4 of sodium bentonite mud and water,
Wherein the viscosity of sodium bentonite mud is 25s;
1.2 are mixed and stirred for polyacrylamide, sodium bentonite mud and water uniformly to obtain modified mud.
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of 2 sand-pebble layers, and concrete operations are as follows:
Shield machine shuts down the first 5 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Embodiment 5
1. preparing modified mud
1.1 claim carboxymethyl cellulose, obtain by weight of carboxymethyl cellulose is the 1.0% of sodium bentonite quality of mud fluid
It the quality of sodium bentonite mud and weighs, and institute's water is calculated according to the mass ratio 1:4 of sodium bentonite mud and water
Amount, wherein the viscosity of sodium bentonite mud is 25s;
1.2 are mixed and stirred for carboxymethyl cellulose, sodium bentonite mud and water uniformly to obtain modified mud.
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of 2 sand-pebble layers, and concrete operations are as follows:
Shield machine shuts down the first 5 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Embodiment 6
1. preparing modified mud
1.1 weigh carboxymethyl cellulose, by weight of carboxymethyl cellulose is the 0.7% of sodium bentonite quality of mud fluid
To sodium bentonite mud quality and weigh, and institute's water is calculated according to the mass ratio 1:5 of sodium bentonite mud and water
Amount, wherein the viscosity of sodium bentonite mud be 35s;
1.2 are mixed and stirred for carboxymethyl cellulose, sodium bentonite mud and water uniformly to obtain modified mud.
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of 2 sand-pebble layers, and concrete operations are as follows:
Shield machine shuts down the first 8 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Embodiment 7
1. preparing modified mud
1.1 weigh polyacrylamide, obtain sodium by weight of polyacrylamide is the 0.3% of sodium bentonite quality of mud fluid
It the quality of base bentonite mud and weighs, and calculates the amount of institute's water according to the mass ratio 1:4 of sodium bentonite mud and water,
Wherein the viscosity of sodium bentonite mud is 25s;
1.2 are mixed and stirred for polyacrylamide, sodium bentonite mud and water uniformly to obtain modified mud.
Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of 2 sand-pebble layers, and concrete operations are as follows:
Shield machine shuts down the first 5 minutes bed drain purges for reducing spiral dumper, while injecting this on pressure chamber and excavation face
The modification mud of embodiment becomes Plastic Flow state until the sandy gravel accumulated in pressure chamber.
Case history
In certain orbit construction, the right wire length 2274.048m and left wire length 2157.2m of this track, minimum curve half
Diameter is R600m, and 4 service channels are arranged in this section, and edpth of tunnel is 9.1~29m, and penetrating ground is mainly Compact sandy-pebble
Layer.Tunnel ruling grade 28 ‰, shield machine digging diameter 8.634m, section of jurisdiction internal diameter 7.5m, section of jurisdiction outer diameter 8.3m.It mainly wears in section
Close land pebble and<3-8-3>closely knit land pebble more in<3-8-2>.Upper Pleistocene series aqueoglacial deposit and punching are mainly passed through in shield section
Lamination (Q3fgl+al) land pebble.Cobble content accounts for about 60~80% in the land pebble, and partial size is mostly 4~17cm, with sub- round
Based on, sorting is poor;Cobble composition is mainly medium weathering-strong weathered granite, quartzy sandstone, limestone, and compression strength is high,
Self-stability is poor, and infiltration coefficient is big, and water penetration is strong, and watery is good.
When shield machine driving is to left 487 ring of line, the spiral dumper of shield machine occurs taking spiral dumper just by card
Anti- both direction rotates repeatedly can not all restore to run well, and determine that the method for shutting down pressure maintaining is taken to carry out the stagnant row of spiral dumper
Processing.
1) bed drain purge is gradually decreased before shutting down 10 minutes, sandy gravel is allowed to fill up entire pressure chamber.2) simultaneously, from pressure chamber
The obtained modified mud of embodiment 3 is injected with excavation face, modified mud injection rate is about in 5m3.Part mud in the process
Slurry will be squeezed into sand-pebble layer in front of excavation face and form mud film, can be greatly lowered pressure chamber mud or high compression air to
Excavation face escape is easier to realize the stabilization of pressure and excavation face in pressure chamber.3) since this shutdown activity duration is long, tentatively
Estimate that the activity duration is more than 10 days.According to field monitoring, after shutting down 12h, the pressure of pressure chamber is reduced to from 0.29MPa
0.2MPa needs injecting compressed air or modified mud.It is empty that excavation face compression is calculated by Geoslope Air program
Gas escape rate is 22.4m3/ h, and two air compressor machines of shield machine equipment produce air pressure rate 76m3/ h, therefore use to pressure chamber
Interior injecting compressed air maintains the stabilization of pressure in pressure chamber.Using the above three steps method, excavation face branch in shield stopping process
Pressure held stationary is protected, the sandy gravel of stagnant row is cleared up by partial cut spiral dumper, backing machine smoothly restores to tunnel within 7 days,
The moment spiral dumper for restoring to promote is not gushed, and sandy gravel state has still maintained Plastic Flow state, and scene takes
The slump that sample is tested to obtain sandy gravel is 170mm.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (6)
1. shield machine shuts down pressure maintaining and prevents the control method of stagnant row in a kind of sand-pebble layer, which is characterized in that shield machine is shut down
The preceding bed drain purge for reducing spiral dumper, while modified mud is injected on pressure chamber and excavation face until accumulating in pressure chamber
Sandy gravel becomes Plastic Flow state or the simultaneously injecting compressed air into pressure chamber.
2. shield machine shuts down pressure maintaining and prevents the control method of stagnant row, feature in sand-pebble layer according to claim 1
It is, shuts down first 5~10 minutes bed drain purges for reducing spiral dumper in shield machine.
3. shield machine shuts down pressure maintaining and prevents the control method of stagnant row, feature in sand-pebble layer according to claim 1
It is, the modified mud is mixed to form by high molecular polymer and sodium bentonite mud, the swollen water ratio of sodium bentonite mud
For 1:(4~6), the Su Shi funnel viscosity of sodium bentonite mud is 25~50s, and the incorporation quality of high molecular polymer is sodium base
The 0.3~1.0% of bentonite slurry quality.
4. shield machine shuts down pressure maintaining and prevents the control method of stagnant row, feature in sand-pebble layer according to claim 3
It is, the high molecular polymer is carboxymethyl cellulose or polyacrylamide.
5. shield machine shuts down pressure maintaining and prevents the controlling party of stagnant row in sand-pebble layer according to any one of claims 1 to 4
Method, which is characterized in that the additional amount of the compressed air is greater than compressed air in the escape velocity of excavation face.
6. shield machine shuts down pressure maintaining and prevents the control method of stagnant row, feature in sand-pebble layer according to claim 5
It is, the escape velocity is calculated using Geoslope Air module.
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Cited By (2)
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CN113294162A (en) * | 2021-05-20 | 2021-08-24 | 北京建工土木工程有限公司 | Shutdown pressure maintaining method of earth pressure balance shield machine |
CN113756833A (en) * | 2021-09-26 | 2021-12-07 | 中交第三航务工程局有限公司 | Method for preventing spiral conveyor of earth pressure balance shield machine from gushing |
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Cited By (3)
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CN113294162A (en) * | 2021-05-20 | 2021-08-24 | 北京建工土木工程有限公司 | Shutdown pressure maintaining method of earth pressure balance shield machine |
CN113294162B (en) * | 2021-05-20 | 2023-11-14 | 北京建工土木工程有限公司 | Shutdown pressure maintaining method for earth pressure balance shield machine |
CN113756833A (en) * | 2021-09-26 | 2021-12-07 | 中交第三航务工程局有限公司 | Method for preventing spiral conveyor of earth pressure balance shield machine from gushing |
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Application publication date: 20191101 |