CN113294162A - Shutdown pressure maintaining method of earth pressure balance shield machine - Google Patents
Shutdown pressure maintaining method of earth pressure balance shield machine Download PDFInfo
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- CN113294162A CN113294162A CN202110551138.0A CN202110551138A CN113294162A CN 113294162 A CN113294162 A CN 113294162A CN 202110551138 A CN202110551138 A CN 202110551138A CN 113294162 A CN113294162 A CN 113294162A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002689 soil Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002002 slurry Substances 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 12
- 239000000440 bentonite Substances 0.000 claims abstract description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004519 grease Substances 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 13
- 238000007569 slipcasting Methods 0.000 claims description 12
- 229940092782 bentonite Drugs 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 230000003203 everyday effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 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 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 229940080314 sodium bentonite Drugs 0.000 claims description 3
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 4
- 239000013589 supplement Substances 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Classifications
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- 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
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- 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
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a stop and pressure maintaining method for a soil pressure balance shield machine, and relates to the technical field of shield machine construction. In order to solve the problem that the shield machine is damaged due to long-time stop, the method specifically comprises the following steps: preparation work before shutdown: selecting a proper stopping place, adjusting the posture of the shield machine when the shield machine stops, and reducing the slag discharge amount of the spiral soil discharging device; filling grease into a shield tail brush sealing area to strengthen sealing; injecting bentonite slurry to the periphery of the shield body through a grouting hole on the shield body; secondary grouting for 360 degrees is carried out on the duct piece in the 5-10 rings of the duct piece just removed from the shield tail through a grouting hole of the tunnel duct piece; before the shield machine stops, the cutter head slowly rotates, and meanwhile, modified slurry is injected into the soil bin through a grouting hole in the shield body by using grouting equipment. The invention fills grease in the sealing area of the shield tail brush before the soil bin grouting is carried out, thereby preventing the shield tail from leaking water and the leaked slurry from immersing into the shield caused by the long-time halt of the shield machine and further damaging the shield equipment.
Description
Technical Field
The invention relates to the technical field of shield machine construction, in particular to a method for stopping and maintaining pressure of a soil pressure balance shield machine.
Background
With the continuous development and utilization of urban underground space, the application range of the shield machine is wider and wider, however, the shield machine often has a long-time shutdown condition due to equipment failure or other uncontrollable factors. The earth pressure balance shield machine prevents the excavation face from collapsing and the ground from sinking by adjusting the pressure of the earth bin. However, the soil pressure shield machine after shutdown faces the problems of insufficient soil bin pressure, sinking of the shield machine, water leakage at the tail of the shield machine, and the shield machine being wrapped by surrounding soil when the shield machine is restarted. At present, two methods of supplementing gas and slurry into the soil bin are commonly adopted, but the construction effect of the method for water-rich areas and sandy gravel strata can be greatly reduced. Therefore, how to ensure that the earth pressure balance shield can be stopped and maintained for a long time under special working conditions is a problem to be solved urgently by technical personnel in the field at present.
Through retrieval, the Chinese patent with the application number of CN201910569745.2 discloses a control method for stopping, pressure maintaining and discharge stagnation prevention of a shield machine in a sandy gravel stratum, which belongs to the technical field of shield machines used in underground engineering. The control method for stopping, pressure maintaining and discharge stopping of the shield machine in the sandy gravel stratum in the patent has the following defects: the shield tail leaks water and slurry leaks into the shield when the shield machine stops for a long time, and then the shield equipment is damaged.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for stopping and maintaining pressure of an earth pressure balance shield machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for stopping and maintaining pressure of a soil pressure balance shield machine comprises the following steps:
s1: preparation work before shutdown: selecting a proper stopping place, adjusting the posture of the shield machine when the shield machine stops, and reducing the slag discharge amount of the spiral soil discharging device;
s2: filling grease into a shield tail brush sealing area to strengthen sealing;
s3: injecting bentonite slurry to the periphery of the shield body through a grouting hole on the shield body;
s4: secondary grouting for 360 degrees is carried out on the duct piece in the 5-10 rings of the duct piece just removed from the shield tail through a grouting hole of the tunnel duct piece;
s5: before the shield machine stops, modified slurry is injected into the soil bin through a grouting hole in the shield body by using grouting equipment while the cutter head slowly rotates;
s6: when the modified slurry is injected, under the condition of keeping a certain soil pressure, replacing the muck or sand pebbles in the soil bin until all replacement is finished;
s7: closing the screw conveyor, and performing pressure drop on the stratum around the soil bin under the action of grouting pressure;
s8: during grouting, when the grouting pressure in the soil bin can be kept stable within a certain time, grouting is finished;
s9: preparation work after shutdown: and regularly observing the pressure of the soil bin every day and timely replenishing slurry according to the change of the pressure of the soil bin on site.
Preferably: the method is characterized in that the attitude of the shield machine during the halt is adjusted to be slightly upward, so that the gradient of the shield machine is 2% higher than the designed axis.
Preferably: the bentonite slurry comprises bentonite and water in a mass ratio of 1: 2; the material of the secondary grouting is grouting double-liquid slurry or mud effect slurry.
Preferably: the grouting pressure in the soil bin is determined according to factors of the rock stratum fracture development degree, the grouting slurry property and the opening rate of a soil bin cutter head.
Preferably: the modified slurry is prepared from the following components in percentage by mass of 1: 2: 6, the sodium bentonite slurry, the fly ash and water.
Preferably: the grouting equipment comprises a grouting pipe arranged on the outer wall of the circumference of the tank body, the inner wall of the tank body is sequentially provided with a mixing chamber and a pure water chamber from top to bottom, and the pure water chamber comprises a water pump; the inner wall of the circumference of the grouting pipe is provided with two convex grooves, the inner walls of the two convex grooves are both provided with a fixing plate, the outer wall of one side of the fixing plate is provided with a plurality of air outlet holes, the outer wall of the top of the fixing plate is fixedly connected with a T-shaped plate, the T-shaped plate and the convex grooves form sliding fit, one end of the T-shaped plate is fixedly connected with a waterproof breathable plate, the outer wall of the T-shaped plate is fixedly connected with air bags, and the outer walls of the two air bags are connected through two elastic belts; the outer wall of the circumference of slip casting pipe fixedly connected with two sets of elastic assembly spare, the one end of two sets of elastic assembly spare is fixed connection respectively in the outer wall of two T templates.
Preferably: the circumferential outer wall of the grouting pipe is fixedly connected with a ventilation port; the circumference outer wall of the tank body and the circumference outer wall of the grouting pipe are fixedly connected with the same backflow pipe, and the circumference outer wall of the backflow pipe is fixedly connected with a valve.
Preferably: the circumference outer wall that the back flow was kept away from to the jar body and the circumference outer wall fixedly connected with same raceway that the back flow was kept away from to the slip casting pipe, the circumference inner wall fixedly connected with filter cartridge of the jar body.
Preferably: the top outer wall of the tank body is fixedly connected with a first feed inlet and a second feed inlet in sequence, the top outer wall of the second feed inlet is provided with a tank cover, the circumference outer wall of the second feed inlet is provided with two slide rails, the bottom inner walls of the two slide rails are fixedly connected with elastic supporting pieces, the inner walls of the two slide rails are connected with moving blocks in a sliding mode, the top outer walls of the two elastic supporting pieces are fixedly connected with the bottom outer walls of the two moving blocks, the top outer walls of the two moving blocks and the bottom outer walls of the two moving blocks are fixedly connected with folding separating plates, the outer wall of one side of the two moving blocks is provided with the same material receiving plate, one side outer wall of one of the moving blocks is provided with an adjusting handle, one side outer wall of the adjusting handle is connected with the circumference outer wall of the material receiving plate through a connecting shaft, one side outer wall of the adjusting handle is fixedly connected with a pointer, and the circumference outer wall of the second feed inlet is provided with a scale.
Preferably: the top outer wall fixedly connected with motor of the jar body, the top inner wall of mixing chamber is provided with the agitator, and the input of agitator is connected with the output of motor through the transmission shaft.
The invention has the beneficial effects that:
1. the shield tail brush sealing area is filled with grease before soil bin grouting is carried out, so that shield tail water leakage caused by long-time shutdown of a shield machine is prevented, leaked slurry is prevented from immersing into the shield, shield equipment is further damaged, bentonite slurry is injected to the periphery of a shield body, the slurry is prevented from diffusing to a gap between a tunnel and the shield body and wrapping the shield body during soil bin grouting, the shield machine shutdown pressure maintaining method can maintain soil pressure balance and long-time stability of soil pressure of the shield machine soil bin in various stratums, particularly sandy gravel stratums and water-rich stratums, and the phenomena of sinking, shield tail water leakage and the like of the shield machine are effectively avoided.
2. The method carries out omnibearing secondary grouting on the duct piece in 5-10 rings of the duct piece just separated from the shield tail, ensures that the gap between the duct piece and the tunnel is filled compactly, and forms a closed space. And when the modified slurry is injected, all the muck or sand and pebbles in the soil bin are replaced, so that the situation that the muck, sand and pebbles and the like are accumulated for a long time to lock the cutter head, and the shield machine cannot be started again is prevented.
3. The pressure maintaining method is safe and reliable, simple to operate and good in economy, and when the shield machine is started again for construction, the shield machine cannot be wrapped up or gushed, so that the reliable construction method is provided for long-time shutdown of the shield machine in shield construction.
4. When grouting is finished, pure water is conveyed into the grouting pipe from the pure water chamber. Then manually pull up two elastic webbing to the both sides of slip casting pipe, make the air bag by the compression, and extrude two sets of elastic sub-assembly, make two upper and lower T templates slide to middle position in two convex grooves, make the fixed plate spill, and because the air bag is compressed, gas wherein jets out through the venthole, make the interior pure water of slip casting pipe to blast through the bubble from this, thereby rock the solidification body in the slip casting pipe, the inner wall of clearance slip casting pipe, avoid not using for a long time and lead to blockking up, influence next use.
5. According to the invention, after the gas in the air bag is completely extruded out, the elastic belt is not pulled, the T-shaped plate is driven by the elastic assembly to return in the convex groove, the air bag is not extruded to automatically supplement external gas, the air bag is convenient to use next time, the waterproof breathable plate prevents water in the grouting pipe from flowing back into the air bag, the material receiving plate is weighted to compress the elastic support member through the two moving blocks by arranging the feed inlet second-class structure along with the increase of the material content on the material receiving plate, and at the moment, people can conveniently know the addition amount through the scale number of the pointer pointing to the scale.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic flow chart of a stopping and pressure maintaining method of an earth pressure balance shield machine according to the present invention;
FIG. 2 is a front sectional view of the grouting equipment according to the present invention;
FIG. 3 is a schematic top view of a second feeding port of the grouting device according to the present invention;
FIG. 4 is a schematic cross-sectional view of a grouting pipe of the grouting apparatus according to the present invention;
fig. 5 is a schematic structural diagram of an air bag of the grouting equipment provided by the invention;
fig. 6 is a schematic cross-sectional structure diagram of a grouting pipe of the grouting equipment according to the invention in the use state of an airbag.
In the figure: 1 tank body, 2 grouting pipes, 3 mixing chambers, 4 feed inlets I, 5 motors, 6 feed inlets II, 7 pointers, 8 stirrers, 9 pure water chambers, 10 filter boxes, 11 return pipes, 12 water conveying pipes, 13 box covers, 14 folding partition plates, 15 material receiving plates, 17 graduated scales, 18 elastic supporting pieces, 19 adjusting handles, 20 sliding rails, 21 convex grooves, 22 air bag bags, 23 ventilation ports, 24 elastic belts, 25T-shaped plates, 26 elastic assembly parts, 27 waterproof ventilation plates, 28 air outlet holes and 29 fixing plates.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1:
a method for stopping and maintaining pressure of an earth pressure balance shield machine is shown in figure 1 and comprises the following steps:
s1: preparation work before shutdown: selecting a proper stopping place, adjusting the posture of the shield machine when the shield machine stops, and reducing the slag discharge amount of the spiral soil discharging device;
s2: filling grease into a sealing area of the shield tail brush to strengthen sealing, and filling grease into the sealing area of the shield tail brush before soil bin grouting is carried out, so that shield tail water leakage and slurry leakage caused by long-time shutdown of a shield machine are prevented from being immersed into the shield, and shield equipment is further damaged;
s3: injecting bentonite slurry to the periphery of the shield body through a grouting hole in the shield body, so as to prevent the slurry from diffusing to a gap between the tunnel and the shield body and wrapping the shield body when the soil bin is grouted;
s4: carrying out 360-degree secondary grouting on the duct pieces in 5-10 rings of the duct pieces just coming off the shield tail through the tunnel duct piece grouting holes, so as to ensure that the gaps between the duct pieces and the tunnel are filled compactly and form a closed space;
s5: before the shield machine stops, the cutter head slowly rotates, and meanwhile, modified slurry is injected into the soil bin through a grouting hole in the shield body by using grouting equipment, so that the slag soil in the bin is conveniently changed into a plastic flowing state;
s6: when the modified slurry is injected, under the condition of keeping a certain soil pressure, replacing the muck or the sand pebbles in the soil bin until all replacement is completed, and preventing the muck, the sand pebbles and the like from accumulating and locking the cutter head for a long time to cause that the shield machine cannot be started again;
s7: closing the screw conveyer, performing pressure drop on the stratum around the soil bin under the action of grouting pressure, pressing the injected modified slurry into the channels of the cracks of the stratum of the face, and blocking water gushing channels or water leakage channels in the direction of the face so as to form a closed space between the soil bin and the face;
s8: during grouting, when the grouting pressure in the soil bin can be kept stable within a certain time, grouting is finished;
s9: preparation work after shutdown: and regularly observing the pressure of the soil bin every day and timely replenishing slurry according to the change of the pressure of the soil bin on site.
The method is characterized in that the attitude of the shield machine during the halt is adjusted to be slightly upward, so that the gradient of the shield machine is slightly higher than the designed axis by 2%. The bentonite slurry comprises bentonite and water in a mass ratio of 1: 2, and the pressure during filling is slightly greater than the pressure of the soil bin. The secondary grouting material is double-grouting or mud-effect-restraining slurry, so that water behind the duct piece is prevented from entering the shield tunneling machine or the cutter head to form a channel. The grouting pressure in the soil bin is determined according to factors such as the development degree of rock stratum fractures, the properties of grouting slurry, the opening ratio of a soil bin cutter head and the like. The modified slurry is prepared from the following components in percentage by mass of 1: 2: 6, mixing the sodium bentonite slurry, the fly ash and water, adjusting the proportion of the modified slurry according to different geological conditions, and carrying out a proportion test before construction. The change amplitude is determined by soil pressure calculation, and when the change amplitude exceeds 10%, the modified slurry needs to be supplemented in time.
When the shield tail brush sealing area filling device is used, a proper stopping place is selected firstly, the shield tail brush sealing area is filled with grease before soil bin grouting is carried out, the shield tail is prevented from leaking water and leaking slurry and immersing into a shield, and shield equipment is prevented from being damaged. Injecting bentonite slurry into the periphery of the shield body, preventing the slurry from diffusing to the space between the tunnel and the shield body and wrapping the shield body when the soil bin is used for grouting, and performing all-dimensional secondary grouting on the segment in 5 rings to 10 rings of the segment just separated from the shield tail, so that the gap between the segment and the tunnel is compactly filled, and a closed space is formed. And when the modified slurry is injected, all the muck or sand and pebbles in the soil bin are replaced, so that the situation that the muck, sand and pebbles and the like are accumulated for a long time to lock the cutter head, and the shield machine cannot be started again is prevented. Closing the screw conveyer, reducing pressure of the stratum around the soil bin under the action of grouting pressure, pressing the injected modified slurry into a channel of a stratum crack of the face, blocking a water gushing channel or a water leakage channel in the direction of the face, further forming a closed space between the soil bin and the face, finishing grouting when the grouting pressure in the soil bin can be kept stable within a certain time, regularly observing the pressure of the soil bin every day after stopping the machine, and timely replenishing slurry according to the change of the pressure of the field soil bin. The shield machine stopping and pressure maintaining method can maintain earth pressure balance and the earth pressure of the shield machine earth bin stable for a long time in various stratums, particularly sandy gravel stratums and water-rich stratums, and effectively avoids the phenomena of sinking of the shield machine, water leakage at the tail of the shield and the like. The pressure maintaining method is safe and reliable, simple to operate and good in economy, and when the shield machine is started again for construction, the shield machine cannot be wrapped up or gushed, so that the reliable construction method is provided for long-time shutdown of the shield machine in shield construction.
Example 2:
a method for stopping and maintaining pressure of a soil pressure balance shield machine is shown in figures 2-6, and in order to avoid blockage when a grouting pipe 2 is not used under the condition of stopping; the grouting equipment comprises a grouting pipe 2 arranged on the outer wall of the circumference of the tank body 1, the inner wall of the tank body 1 is sequentially provided with a mixing chamber 3 and a pure water chamber 9 from top to bottom, and the pure water chamber 9 comprises a water pump; the inner wall of the circumference of the grouting pipe 2 is provided with two convex grooves 21, the inner walls of the two convex grooves 21 are respectively clamped with a fixing plate 29, the outer wall of one side of the fixing plate 29 is provided with a plurality of air outlet holes 28, the outer wall of the top of the fixing plate 29 is fixed with a T-shaped plate 25 through bolts, the T-shaped plate 25 and the convex grooves 21 form sliding fit, one end of the T-shaped plate 25 is fixed with a waterproof breathable plate 27 through bolts, the outer wall of the T-shaped plate 25 is fixed with air bags 22 through bolts, and the outer walls of the two air bags 22 are connected through two elastic belts 24; two groups of elastic assembly parts 26 are fixed on the circumferential outer wall of the grouting pipe 2 through bolts, and one ends of the two groups of elastic assembly parts 26 are respectively fixed on the outer walls of the two T-shaped plates 25 through bolts. When the grouting is finished, pure water is supplied from the pure water chamber 9 to the grouting pipe 2. Then, the two elastic bands 24 are manually pulled up to the two sides of the grouting pipe 2, so that the air bag 22 is compressed, the two groups of elastic assemblies 26 are extruded, the upper T-shaped plate 25 and the lower T-shaped plate 25 slide towards the middle position in the two convex grooves 21, and the fixing plate 29 leaks out, as shown in fig. 6, because the air bag 22 is compressed, the gas in the air bag is ejected out through the air outlet 28, so that the pure water in the grouting pipe 2 is blown by bubbles, a solidified body in the grouting pipe 2 is shaken, the inner wall of the grouting pipe 2 is cleaned, and the blockage caused by long-time non-use is avoided, and the next use is influenced. After the air in the airbag 22 is completely squeezed out, the elastic belt 24 is not pulled, the T-shaped plate 25 is driven by the elastic assembly 26 to return to the convex groove 21, the airbag 22 is not squeezed to automatically supplement external air, so that the airbag is convenient for next use, and the waterproof breathable plate 27 prevents water in the grouting pipe 2 from flowing back into the airbag 22.
The circumferential outer wall of the grouting pipe 2 is fixed with a ventilation port 23 through a bolt; the same backflow pipe 11 is fixed on the circumferential outer wall of the tank body 1 and the circumferential outer wall of the grouting pipe 2 through bolts, and a valve is fixed on the circumferential outer wall of the backflow pipe 11 through bolts; the same water delivery pipe 12 is fixed on the circumferential outer wall of the tank body 1 far away from the return pipe 11 and the circumferential outer wall of the grouting pipe 2 far away from the return pipe 11 through bolts, and the filter box 10 is fixed on the circumferential inner wall of the tank body 1 through bolts. The water pump is started to deliver pure water into the grouting pipe 2 through the water delivery pipe 12 so as to perform a cleaning function. When the supplementary gas in the grouting pipe 2 is flushed, the valve on the ventilation port 23 is opened, so that the damage caused by the large pressure in the grouting pipe 2 is avoided. After the inner wall of the grouting pipe 2 is cleaned, the valve is opened, so that the sewage in the grouting pipe 2 flows back to the pure water chamber 9 through the return pipe 11, and the filter box 10 effectively filters impurities in the sewage, thereby facilitating the recovery of water resources.
The outer wall of the top of the tank body 1 is sequentially fixed with a first feed inlet 4 and a second feed inlet 6 through bolts, the outer wall of the top of the second feed inlet 6 is connected with a tank cover 13 through hinges, the outer wall of the circumference of the second feed inlet 6 is provided with two slide rails 20, the inner walls of the bottoms of the two slide rails 20 are both fixed with elastic supporting pieces 18 through bolts, the inner walls of the two slide rails 20 are both connected with moving blocks in a sliding way, the top ends of the two elastic supporting pieces 18 are fixed with the outer walls of the bottoms of the two moving blocks through bolts, the outer walls of the tops and the outer walls of the bottoms of the two moving blocks are both fixed with folding partition plates 14 through bolts, the outer wall of one side of the two moving blocks opposite to each other is connected with the same material receiving plate 15 through a rotating shaft in a rotating way, one outer wall of one moving block is connected with an adjusting handle 19 through a rotating shaft, one outer wall of one adjusting handle 19 is connected with a pointer 7 through bolts, and a graduated scale 17 is bonded on the circumferential outer wall of the second feed inlet 6. Corresponding raw materials are filled into the mixing chamber 3 from the first feeding hole 4 and the second feeding hole 6 respectively, when the second feeding hole 6 is used, the box cover 13 is opened to add the raw materials into the material receiving plate 15, the material content on the material receiving plate 15 is increased, the material receiving plate 15 is stressed by the two moving blocks to compress the elastic supporting piece 18, and people can conveniently know the adding amount by the scale of the pointer 7 pointing to the graduated scale 17 at the moment. After the addition is completed, the adjusting handle 19 is manually rotated to turn over the receiving plate 15, so that the raw materials thereon are introduced into the mixing chamber 3.
The top outer wall of the tank body 1 is fixed with a motor 5 through a bolt, the top inner wall of the mixing chamber 3 is rotatably connected with a stirrer 8 through a rotating shaft, and the input end of the stirrer 8 is connected with the output end of the motor 5 through a transmission shaft. The starting motor 5 drives the stirrer 8 to rotate, and then the materials in the mixing chamber 3 are mixed and stirred.
This embodiment is when using, fills in corresponding raw materials to compounding room 3 in from feed inlet one 4 and feed inlet two 6 respectively, when using feed inlet two 6, opens case lid 13 and adds the raw materials on connecing flitch 15, along with the material content increase on connecing flitch 15, connects flitch 15 atress to pass through two movable block compression elastic support 18, and the scale through the directional scale 17 of pointer 7 is convenient for people to know the addition this moment. After the addition is completed, the adjusting handle 19 is manually rotated to turn over the receiving plate 15, so that the raw materials thereon are introduced into the mixing chamber 3. The starting motor 5 drives the stirrer 8 to rotate, and then the materials in the mixing chamber 3 are mixed and stirred. When grouting is finished, the water pump is started, and pure water is conveyed from the pure water chamber 9 to the grouting pipe 2 through the water conveying pipe 12. Open the valve on ventilative mouth 23, avoid the great damage that produces of slip casting pipe 2 internal pressure, then manually pull up two elastic webbing 24 to the both sides of slip casting pipe 2, make gasbag 22 compressed, and extrude two sets of elastic sub-assembly 26, make two upper and lower T type boards 25 slide to middle position in two convex grooves 21, make fixed plate 29 spill, as shown in fig. 6, and because gasbag 22 is compressed, gas wherein jets out through venthole 28, make the pure water in the slip casting pipe 2 to blast through the bubble from this, thereby rock the solidification body in the slip casting pipe 2, clear up the inner wall of slip casting pipe 2, avoid not using for a long time and lead to blockking up, influence next use. When the air in the airbag 22 is completely squeezed out, the elastic belt 24 is not pulled, the T-shaped plate 25 is driven by the elastic assembly 26 to return to the convex groove 21, and the airbag 22 is not squeezed to automatically supplement the external air. After the inner wall of the grouting pipe 2 is cleaned, the valve is opened, so that the sewage in the grouting pipe 2 flows back to the pure water chamber 9 through the return pipe 11, and the filter box 10 effectively filters impurities in the sewage, thereby facilitating the recovery of water resources.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A method for stopping and maintaining pressure of a soil pressure balance shield machine is characterized by comprising the following steps:
s1: preparation work before shutdown: selecting a proper stopping place, adjusting the posture of the shield machine when the shield machine stops, and reducing the slag discharge amount of the spiral soil discharging device;
s2: filling grease into a shield tail brush sealing area to strengthen sealing;
s3: injecting bentonite slurry to the periphery of the shield body through a grouting hole on the shield body;
s4: secondary grouting for 360 degrees is carried out on the duct piece in the 5-10 rings of the duct piece just removed from the shield tail through a grouting hole of the tunnel duct piece;
s5: before the shield machine stops, modified slurry is injected into the soil bin through a grouting hole in the shield body by using grouting equipment while the cutter head slowly rotates;
s6: when the modified slurry is injected, under the condition of keeping a certain soil pressure, replacing the muck or sand pebbles in the soil bin until all replacement is finished;
s7: closing the screw conveyor, and performing pressure drop on the stratum around the soil bin under the action of grouting pressure;
s8: during grouting, when the grouting pressure in the soil bin can be kept stable within a certain time, grouting is finished;
s9: preparation work after shutdown: and regularly observing the pressure of the soil bin every day and timely replenishing slurry according to the change of the pressure of the soil bin on site.
2. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 1, wherein the adjusting of the attitude of the shield machine during the stop is to adjust the shield machine slightly upward so that the gradient of the shield machine is 2% higher than the designed axis.
3. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 2, wherein the bentonite slurry comprises bentonite and water in a mass ratio of 1: 2; the material of the secondary grouting is grouting double-liquid slurry or mud effect slurry.
4. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 3, wherein the grouting pressure in the earth bin is determined according to factors such as the development degree of rock cracks, the properties of grouting slurry and the cutter head opening rate of the earth bin.
5. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 4, wherein the modified slurry is prepared from the following components in a mass ratio of 1: 2: 6, the sodium bentonite slurry, the fly ash and water.
6. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 1, wherein the grouting equipment comprises a grouting pipe (2) arranged on the outer wall of the circumference of the tank body (1), the inner wall of the tank body (1) is sequentially provided with a mixing chamber (3) and a pure water chamber (9) from top to bottom, and the pure water chamber (9) comprises a water pump; the inner wall of the circumference of the grouting pipe (2) is provided with two convex grooves (21), the inner walls of the two convex grooves (21) are respectively provided with a fixing plate (29), the outer wall of one side of the fixing plate (29) is provided with a plurality of air outlet holes (28), the outer wall of the top of the fixing plate (29) is fixedly connected with a T-shaped plate (25), the T-shaped plate (25) and the convex grooves (21) form sliding fit, one end of the T-shaped plate (25) is fixedly connected with a waterproof breathable plate (27), the outer wall of the T-shaped plate (25) is fixedly connected with air bags (22), and the outer walls of the two air bags (22) are connected through two elastic belts (24); the outer wall of the circumference of the grouting pipe (2) is fixedly connected with two groups of elastic assembly parts (26), and one ends of the two groups of elastic assembly parts (26) are respectively and fixedly connected to the outer walls of the two T-shaped plates (25).
7. The stopping and pressure maintaining method of the earth pressure balance shield machine according to claim 6, characterized in that the circumferential outer wall of the grouting pipe (2) is fixedly connected with a ventilation port (23); the utility model discloses a grouting device, including jar body (1), the circumference outer wall of jar body (1) and the circumference outer wall fixedly connected with of slip casting pipe (2) same back flow (11), the circumference outer wall fixedly connected with valve of back flow (11).
8. The stopping and pressure maintaining method for the earth pressure balance shield machine according to claim 7, characterized in that the circumferential outer wall of the tank body (1) far away from the return pipe (11) and the circumferential outer wall of the grouting pipe (2) far away from the return pipe (11) are fixedly connected with the same water pipe (12), and the circumferential inner wall of the tank body (1) is fixedly connected with the filter box (10).
9. The stopping and pressure maintaining method for the earth pressure balance shield machine according to claim 8, characterized in that the outer wall of the top of the tank body (1) is fixedly connected with a first feed port (4) and a second feed port (6) in sequence, the outer wall of the top of the second feed port (6) is provided with a tank cover (13), the outer wall of the circumference of the second feed port (6) is provided with two slide rails (20), the inner walls of the bottoms of the two slide rails (20) are fixedly connected with elastic supporting members (18), the inner walls of the two slide rails (20) are slidably connected with moving blocks, the top ends of the two elastic supporting members (18) are fixedly connected with the outer walls of the bottoms of the two moving blocks, the outer walls of the tops and the outer walls of the bottoms of the two moving blocks are fixedly connected with folding partition plates (14), the outer wall of one side opposite to the two moving blocks is provided with a same material receiving plate (15), one outer wall of one moving block is provided with an adjusting handle (19), the outer wall of one side of the adjusting handle (19) is connected with the outer wall of the circumference of the material receiving plate (15) through a connecting shaft, the outer wall of one side of the adjusting handle (19) is fixedly connected with a pointer (7), and the outer wall of the circumference of the second feeding port (6) is provided with a graduated scale (17).
10. The method for stopping and maintaining the pressure of the earth pressure balance shield machine according to claim 9, wherein a motor (5) is fixedly connected to the outer wall of the top of the tank body (1), a stirrer (8) is arranged on the inner wall of the top of the mixing chamber (3), and the input end of the stirrer (8) is connected with the output end of the motor (5) through a transmission shaft.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863943A (en) * | 2021-10-12 | 2021-12-31 | 中建八局轨道交通建设有限公司 | Pressure maintaining method for long-time halt of slurry balance shield after matched disassembly and assembly |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006248088A (en) * | 2005-03-11 | 2006-09-21 | Isamu Mizobuchi | Method for cleaning bored hole for injecting grout agent |
| JP2009013702A (en) * | 2007-07-06 | 2009-01-22 | Ihi Corp | Slurry shield machine |
| CN105736004A (en) * | 2016-03-11 | 2016-07-06 | 广州轨道交通建设监理有限公司 | Balanced shield mud air-pressure cabin opening pressure maintaining and wall protecting construction method for shield tunneling |
| CN110397441A (en) * | 2019-06-27 | 2019-11-01 | 中交一公局第三工程有限公司 | Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer |
| CN110397444A (en) * | 2019-08-19 | 2019-11-01 | 中铁十二局集团有限公司 | Shallow earthing upper-soft lower-hard ground shield machine opens a position the method for tool changing |
| CN210798997U (en) * | 2019-10-31 | 2020-06-19 | 中交隧道工程局有限公司 | Shield constructs quick-witted slip casting pipeline convenient to wash |
| CN211973600U (en) * | 2020-03-27 | 2020-11-20 | 中铁二十局集团第五工程有限公司 | Grouting reinforcement device for bridge pile foundation |
| CN112523763A (en) * | 2020-12-01 | 2021-03-19 | 中铁十二局集团有限公司 | Long-time shutdown construction method for water-rich sand layer shield |
-
2021
- 2021-05-20 CN CN202110551138.0A patent/CN113294162B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006248088A (en) * | 2005-03-11 | 2006-09-21 | Isamu Mizobuchi | Method for cleaning bored hole for injecting grout agent |
| JP2009013702A (en) * | 2007-07-06 | 2009-01-22 | Ihi Corp | Slurry shield machine |
| CN105736004A (en) * | 2016-03-11 | 2016-07-06 | 广州轨道交通建设监理有限公司 | Balanced shield mud air-pressure cabin opening pressure maintaining and wall protecting construction method for shield tunneling |
| CN110397441A (en) * | 2019-06-27 | 2019-11-01 | 中交一公局第三工程有限公司 | Shield machine shuts down pressure maintaining and prevents the control method of stagnant row in sand-pebble layer |
| CN110397444A (en) * | 2019-08-19 | 2019-11-01 | 中铁十二局集团有限公司 | Shallow earthing upper-soft lower-hard ground shield machine opens a position the method for tool changing |
| CN210798997U (en) * | 2019-10-31 | 2020-06-19 | 中交隧道工程局有限公司 | Shield constructs quick-witted slip casting pipeline convenient to wash |
| CN211973600U (en) * | 2020-03-27 | 2020-11-20 | 中铁二十局集团第五工程有限公司 | Grouting reinforcement device for bridge pile foundation |
| CN112523763A (en) * | 2020-12-01 | 2021-03-19 | 中铁十二局集团有限公司 | Long-time shutdown construction method for water-rich sand layer shield |
Non-Patent Citations (3)
| Title |
|---|
| 汪辉武: "强透水砂卵石地层泥水盾构带压与常压进仓技术", 施工技术, pages 61 - 84 * |
| 罗星燕;汤泳;: "泥水盾构在不良地层的气压开舱施工", 广东土木与建筑, no. 02, pages 49 - 52 * |
| 韩兴超: "盾构注浆管路自动清洗排污系统及控制方法", 建筑机械化, pages 52 - 54 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863943A (en) * | 2021-10-12 | 2021-12-31 | 中建八局轨道交通建设有限公司 | Pressure maintaining method for long-time halt of slurry balance shield after matched disassembly and assembly |
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| CN113294162B (en) | 2023-11-14 |
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