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 PDF

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Publication number
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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CN
China
Prior art keywords
shield machine
mud
shuts down
sand
pressure chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910569745.2A
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Chinese (zh)
Inventor
葸振东
孙鹤明
张书香
王文广
张波
樊德东
张曾强
易秋雨
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Third Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
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No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
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Application filed by No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd filed Critical No 1 Engineering Co Ltd of CCCC First Highway Engineering Co Ltd
Priority to CN201910569745.2A priority Critical patent/CN110397441A/en
Publication of CN110397441A publication Critical patent/CN110397441A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/12Devices for removing or hauling away excavated material or spoil; Working or loading platforms
    • E21D9/124Helical conveying means therefor

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  • 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

Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer
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.
CN201910569745.2A 2019-06-27 2019-06-27 Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer Pending CN110397441A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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