CN108060931B - Novel grouting system and grouting process for effectively controlling ground subsidence - Google Patents
Novel grouting system and grouting process for effectively controlling ground subsidence Download PDFInfo
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- CN108060931B CN108060931B CN201810049206.1A CN201810049206A CN108060931B CN 108060931 B CN108060931 B CN 108060931B CN 201810049206 A CN201810049206 A CN 201810049206A CN 108060931 B CN108060931 B CN 108060931B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 237
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 141
- 238000003756 stirring Methods 0.000 claims abstract description 80
- 230000001360 synchronised effect Effects 0.000 claims abstract description 48
- 238000001125 extrusion Methods 0.000 claims abstract description 40
- 230000005641 tunneling Effects 0.000 claims abstract description 18
- 239000002689 soil Substances 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 210000000988 bone and bone Anatomy 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 239000010754 BS 2869 Class F Substances 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound 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 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 claims 1
- 238000004062 sedimentation Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0671—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end with means for consolidating the rock in front of the shield by injection of consolidating substances through boreholes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention provides a novel grouting system and a novel grouting method for effectively controlling ground subsidence. The device comprises a slurry stirring device, a slurry conveying device, a shield tail synchronous grouting system and an inert slurry synchronous grouting system, wherein the inert slurry synchronous grouting system comprises a third extrusion pump arranged at a discharge hole of a thick slurry vehicle, an inert slurry tank and an inert slurry grouting pump arranged at the discharge hole of the inert slurry tank, the inert slurry tank is composed of a tank body and a stirring device arranged in the tank body, the bottom of the tank body is provided with a slurry outlet, and the tank body is provided with a slurry inlet and a plurality of observation windows; the thick slurry vehicle is communicated with a slurry inlet of the inert slurry tank through a third extrusion pump and a slurry conveying pipe. In the tunneling process, every tunneling a ring, conventional shield tail mortar synchronous grouting is performed through a shield tail mortar grouting system, and simultaneously shield body grouting is performed from two radial straight holes closest to 12 points of a shield body through an inert slurry grouting system. According to the invention, the novel inert slurry is synchronously injected, so that the ground subsidence caused by the fact that gaps outside the shield body cannot be filled in time is avoided.
Description
Technical Field
The invention relates to the technical field of tunnel shield, in particular to a novel grouting process capable of effectively controlling sedimentation when an important building is constructed and a grouting system used in the process.
Background
In recent years, subway traffic has gradually become an important means for solving traffic jam in cities, and a shield method is used as a main construction method for subway construction and has been widely and widely used. In urban construction, ground subsidence control is the first factor for ensuring the safety of ground structures, and along with expansion and perfection of a subway traffic network, a subway tunnel inevitably needs to pass through more structures and even operate subway lines under complex geological conditions, which puts forward higher requirements on stratum subsidence control technology of shield construction.
The earth surface subsidence generated in the shield tunneling process is mainly caused by stratum loss caused by construction. (stratum loss is the difference between the volume of an excavated soil body and the volume of a built tunnel in shield construction), in order to control stratum loss, the shield machine is provided with a synchronous grouting system, and the outer gap of a segment is filled by timely injecting synchronous slurry behind the shield tail so as to compensate stratum loss; and simultaneously, filling the places which are not filled tightly by secondary grouting. These measures play an important role in controlling the ground subsidence. However, the method inevitably has a problem that when the shield tunneling machine is tunneling, the excavation section of the excavating cutter head is slightly larger than the outer diameter of the shield body and larger than the outer diameter of the segment, and the gap outside the shield body cannot be filled in time in the tunneling process, if the geological condition is poor, ground subsidence can occur because the gap outside the shield body cannot be filled in time, when the stratum above the cutter head collapses, the space where the shield collapses needs to be filled in time and an effective support is formed, but grouting of the shield tail has no capability to the space, so that when the shield tunneling machine is tunneling until the shield tail reaches the collapse place, the space is required to be pushed by about 5-6 rings, and the larger range is always transferred upwards at the moment, even the ground is reached, so that: conventional grouting methods have been difficult to achieve effective control of sedimentation when geological conditions are poor or through important built structures.
Disclosure of Invention
According to the invention, the novel grouting system and the grouting process for effectively controlling ground subsidence are provided according to the defects of the prior art, the grouting system can simultaneously perform shield tail mortar injection and shield body inert slurry injection, the inert slurry has good stability, fluidity and proper slump, and the slurry is injected into the radial inclined holes of the shield body, so that rapid filling and supporting of the formation collapse part can be realized, collapse diffusion or transfer is prevented, and the sedimentation control effect is very ideal.
The technical scheme provided by the invention is as follows: the novel grouting system for effectively controlling ground subsidence is characterized in that: the grouting system comprises a slurry stirring device, a slurry conveying device, a shield tail synchronous grouting system and an inert slurry synchronous grouting system, wherein the slurry stirring device comprises a first storage tank and an aggregate bin, a slurry conveying port and a thick slurry conveying port with control valves are respectively arranged at the bottom of the aggregate bin, the slurry conveying port is connected with a second slurry pump through a slurry pipe, and the thick slurry conveying port is connected with a first extrusion pump through a slurry pipe; the slurry conveying device comprises a slurry tank, a thick slurry tank, a slurry vehicle and a thick slurry vehicle, wherein second extrusion pumps are arranged at discharge holes of the slurry tank and the thick slurry tank, a feed inlet of the slurry tank is communicated with the second slurry pump through a slurry conveying pipe, the discharge hole is directly communicated with a shield tail synchronous grouting system through the second extrusion pump, and the feed inlet of the thick slurry tank is communicated with the first extrusion pump through the slurry conveying pipe; the inert slurry synchronous grouting system comprises a third extrusion pump arranged at a discharge hole of the thick slurry vehicle, an inert slurry tank and an inert slurry grouting pump arranged at the discharge hole of the inert slurry tank, wherein the inert slurry tank is composed of a tank body and a stirring device arranged in the tank body, the bottom of the tank body is provided with a slurry outlet, and the tank body is provided with a slurry inlet and a plurality of observation windows; the thick slurry storage tank of the thick slurry vehicle is internally provided with a plurality of stirring blades with the same direction, and the thick slurry storage tank of the thick slurry vehicle is communicated with the slurry inlet of the inert slurry tank through a third extrusion pump and a slurry conveying pipe.
The invention has the preferable technical scheme that: the shield tail synchronous grouting system comprises a trolley mortar tank, a mortar grouting pump and a mortar pump arranged at a discharge port of the mortar vehicle, and the mortar vehicle is directly communicated with the mortar grouting pump; or is communicated with a feed inlet of the trolley mortar tank; or respectively communicated with the mortar grouting pump and the feeding port of the trolley mortar tank through a branch pipeline, and a three-way control valve is arranged on the branch pipeline; when the mortar truck is directly communicated with the mortar grouting pump or is simultaneously communicated with the mortar grouting pump and the trolley mortar tank, a storage hopper is arranged in a second storage tank of the mortar truck, a grouting port directly connected with the mortar grouting pump is arranged at the bottom of the storage hopper, an overflow port is formed in the position, higher than the second storage tank, of the storage hopper, the grouting pump of the mortar truck leads to the storage hopper through a mortar conveying pipe, and a grouting pipe communicated with the mortar grouting pump is arranged at the grouting port.
The invention has the preferable technical scheme that: the mortar grouting pump is provided with two independently controlled mortar outlets, and pipelines of the two mortar outlets are divided into four shield tail synchronous mortar grouting pipes at the shield tail; the inert slurry grouting pump is provided with a slurry outlet which is controlled independently, a pipeline of the slurry outlet is divided into two grouting pipelines at the shield body, and the pipelines perform shield body grouting through radial straight holes of the shield body.
The invention has the preferable technical scheme that: the slurry stirring device further comprises a stirring station communicated with the feeding hole of the first storage tank, wherein the first storage tank and the aggregate bin are integrated or separated, and when the first storage tank and the aggregate bin are separated, a first slurry pump is arranged at the discharging hole of the first storage tank and communicated with the feeding hole of the aggregate bin through a feed liquid conveying pipe; a vibration pump is arranged on the discharging hopper of the aggregate bin.
The invention has the preferable technical scheme that: the mortar tanks are one or more mortar tanks connected in series, and a second extrusion pump is arranged at a discharge hole of each mortar tank; and a ground pump is arranged on the thick paste conveying pipe between the thick paste tank and the first extrusion pump.
The invention has the preferable technical scheme that: the discharge hole of the thick slurry truck is arranged at the bottom of the tail end of the slurry storage tank, a stirring main shaft is horizontally arranged in the slurry storage tank, each stirring blade consists of a stirring shaft and blades arranged at the end part of the stirring shaft, and the blades of each stirring blade have the same inclination angle and face the direction of the slurry outlet; the stirring blades are uniformly distributed on the stirring main shaft, and the included angle between the stirring shaft of each stirring blade and the stirring main shaft is the same; the stirring device in the inert slurry tank consists of a stirring rotating shaft transversely arranged in the tank body, blades spirally distributed on the stirring rotating shaft and a reducing motor arranged outside the tank body.
The invention has the preferable technical scheme that: the discharge hole of the mortar truck is arranged at the central position of the bottom of the second storage tank, the mortar pump is arranged at the discharge hole, the storage hopper is arranged at the top end of the tail part of the second storage tank, part of the storage hopper is higher than the second storage tank, and the lower part of the storage hopper is in a funnel shape; the overflow port is arranged at the part of the storage hopper higher than the second storage tank, and is connected with a return pipe leading into the second storage tank, and the size of the grouting port is equal to the size of the feed port of the mortar grouting pump; a plurality of stirring blades are arranged in the second storage tank, and the angles of the stirring blades positioned on two sides of the pulp pump are opposite.
The invention provides a novel grouting process for effectively controlling ground subsidence, which is characterized in that the grouting process adopts the grouting system of any one of claims 1 to 3 for grouting, and comprises the following specific steps:
(1) Preparing a novel inert slurry for synchronous grouting according to the following formula, wherein the mass percentages of all substances are as follows: 4-8% of lime, 40-50% of sand, 20-30% of fly ash, 2-4% of bentonite and 20-30% of water; wherein the fly ash adopts class F secondary; bentonite adopts sodium-based soil secondary; placing the substances in a stirring device to stir to prepare novel inert slurry;
(2) Conveying the novel inert slurry prepared in the step (1) into a thick slurry tank through a first extrusion pump of a thick slurry conveying port of a bone stock bin of a stirring device, conveying the novel inert slurry to a thick slurry vehicle through a second extrusion pump of a discharge port of the thick slurry tank, conveying the thick slurry vehicle to a first section trolley through a tunnel track, and conveying the novel inert slurry into the inert slurry tank through a third extrusion pump of the discharge port of the thick slurry vehicle to prepare for a shield synchronous grouting process;
(3) Preparing a conventional mortar slurry for shield synchronous grouting in a stirring device, pumping the prepared mortar into a mortar tank through a second mortar pump at a mortar conveying port of a bone stock bin of the stirring device, and then conveying the mortar into a slurry storage device of a shield tail mortar synchronous grouting system through a second extrusion pump at a discharge port of the mortar tank to prepare a shield tail synchronous grouting process;
(4) In the tunneling process, every tunneling one ring, conventional shield tail mortar synchronous grouting is performed through a shield tail mortar grouting system, simultaneously, shield body grouting is performed through two radial straight holes closest to 12 points of a shield body through an inert slurry grouting pump, gaps between the shield body and soil bodies are filled, and grouting amount of the novel inert slurry for each pushing ring pipe slice is the volume of the gap between the shield body and the soil bodies with the width of one ring pipe slice.
The invention has the preferable technical scheme that: providing settlement data through automatic monitoring when the shield tunneling in the step (4) passes through the construction, simultaneously, performing travel management when the dregs are discharged, performing emergency filling grouting when the settlement data are increased or the dregs are overturned, simultaneously monitoring the settlement value in the emergency filling grouting process, and stopping the emergency filling grouting when the settlement value is not increased and is reduced; the emergency filling grouting is to perform shield grouting on novel inert slurry in a trolley slurry storage tank through an inert slurry grouting pump and two radial straight holes closest to 12 points of a shield cutter head, wherein grouting pressure control value is control pressure of the upper part of a soil bin; the grouting quantity is controlled according to the excess quantity, wherein the excess quantity is the actual slag discharging quantity minus the theoretical slag discharging quantity calculated according to the actual management stroke of the shield machine.
The invention has the preferable technical scheme that: the mortar conveyed by the mortar tank in the step (3) can be directly stored in a mortar vehicle storage tank, and shield tail mortar synchronous grouting is directly carried out; or the mortar is conveyed into a trolley mortar storage tank through a mortar vehicle to perform shield tail mortar synchronous grouting in a conventional mode.
According to the invention, each time the shield body is injected, novel inert slurry is injected from two radial straight holes closest to 12 points of the shield body, the grouting volume of each ring is the volume of a gap between one ring of shield body and soil body, when monitoring and detecting that sedimentation is increased or counting that the slag soil is over-square (the actual soil output is larger than the slag soil volume corresponding to the actual management stroke), novel inert slurry can be further supplemented and injected through the radial straight holes (two radial holes closest to 12 points) of the shield body, the filling of a collapse area can be rapidly realized through extrusion, sedimentation is prevented from being further enlarged, sedimentation is reduced, and the sedimentation control effect is very ideal. The grouting amount is not less than the excess amount, and the pressure is controlled according to the pressure at the upper part of the soil bin.
In the shield tunneling process, the cement mortar can be synchronously injected into the shield tail, and the novel inert slurry can be used for radial supplementary grouting of the shield body, wherein the novel inert slurry has certain self-standing performance, and the slump is 190-210, so that the design of effective filling grouting can be realized, the initial setting time of the slurry exceeds 24 hours, the consolidation strength is extremely low, the problem of escape caused by wrapping the shield body is avoided, and the ground subsidence caused by incapability of timely filling gaps outside the shield body is avoided.
Drawings
FIG. 1 is a schematic view of the overall construction of a grouting system according to the present invention;
FIG. 2 is an enlarged schematic view of the connection of the mortar truck to the truck mortar tank in the invention;
FIG. 3 is an enlarged schematic view of the mortar truck of the invention directly connected to a mortar pump;
FIG. 4 is an enlarged schematic view of the inert slurry grouting system of the present invention;
FIG. 5 is a schematic view of the structure of the inert slurry tank of the present invention;
FIG. 6 is a schematic view of the structure of the stirring vane in the storage tank of the inert slurry car according to the present invention;
fig. 7 and 8 are schematic views of a mortar truck capable of being directly connected with a mortar injection pump in the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples, wherein a novel grouting system for effectively controlling ground subsidence is shown in fig. 1, and is characterized in that: the grouting system comprises a slurry stirring device, a slurry conveying device, a shield tail synchronous grouting system and an inert slurry synchronous grouting system. The slurry stirring device comprises a first storage tank 1, an aggregate bin 2 and a stirring station 19 communicated with a feed inlet of the first storage tank 1, wherein the first storage tank 1 and the aggregate bin 2 are integrated or separated, and when the first storage tank 1 and the aggregate bin 2 are in a separated state, a first slurry pump 3 is arranged at a discharge outlet of the first storage tank 1 and communicated with the feed inlet of the aggregate bin 2 through a feed liquid conveying pipe; the bottom of the aggregate bin 2 is respectively provided with a mortar conveying port 4 with a control valve and a thick mortar conveying port 5, the mortar conveying port 4 is connected with second slag slurry 9 through a slurry pipe, and the thick mortar conveying port 5 is connected with a first extrusion pump 10 through a slurry pipe; the vibration pump 6 is arranged on the discharging hopper of the aggregate bin 2, and when inert slurry stirring is carried out, the vibration pump 6 needs to be started to accelerate the discharging speed of the inert slurry, and the inert slurry is prevented from adhering to the bin wall of the aggregate bin 2.
As shown in fig. 1, the slurry conveying device comprises a slurry tank 7, a thick slurry tank 8, a slurry vehicle 12 and a thick slurry vehicle 13, wherein the discharge ports of the slurry tank 7 and the thick slurry tank 8 are respectively provided with a second extrusion pump 7-1, the feed port of the slurry tank 7 is communicated with a second slurry pump 9 through a slurry conveying pipe, the discharge port is directly communicated with a shield tail synchronous grouting system through the second extrusion pump 7-1, and the feed port of the thick slurry tank 8 is communicated with a first extrusion pump 10 through a slurry conveying pipe. If the conveying route is too long, the mortar tank 7 is one or more mortar tanks 7 connected in series, and a second extrusion pump 7-1 is arranged at the discharge port of each mortar tank 7; a ground pump 11 is arranged on the thick paste conveying pipe between the thick paste tank 8 and the first extrusion pump 10.
As shown in fig. 2 and 3, the shield tail synchronous grouting system comprises a trolley mortar tank 17, a mortar grouting pump 18 and a grouting pump 12-3 arranged at a discharge port of the mortar vehicle, wherein the discharge port of the mortar vehicle 12 is arranged at the central position of the bottom of the mortar storage tank 12-1, the grouting pump 12-3 is arranged at the discharge port, the mortar vehicle 12 is directly communicated with the mortar grouting pump 18, the mortar grouting pump 18 is provided with two separately controlled grouting ports, and pipelines of the two grouting ports are divided into four shield tail synchronous grouting pipes at the shield tail; or is communicated with a feed inlet of the trolley mortar tank 17; or respectively communicated with the mortar grouting pump 18 and the feeding port of the trolley mortar tank 17 through a branch pipeline, and a three-way control valve is arranged on the branch pipeline. When the mortar truck 12 is directly communicated with the mortar grouting pump 18 or is simultaneously communicated with the mortar grouting pump 18 and the trolley mortar tank 17, as shown in fig. 7 and 8, a storage hopper 12-2 is arranged in a first storage tank 12-1 of the mortar truck 12, a grouting port 12-4 directly connected with the mortar grouting pump 14 is arranged at the bottom of the storage hopper 12-2, an overflow port 12-5 is arranged at a position higher than the first storage tank 12-1 of the storage hopper 12-2, a pumping pump 12-3 of the mortar truck 12 is led into the storage hopper 12-2 through a mortar conveying pipe, and a grouting pipe communicated with the mortar grouting pump 18 is arranged at the grouting port 12-4. The storage hopper 12-2 is arranged at the top end of the tail part of the slurry storage tank 12-1, and part of the storage hopper is higher than the slurry storage tank 12-1, and the lower part of the storage hopper is funnel-shaped; the overflow port 12-5 is arranged at the part of the storage hopper 12-2 higher than the slurry storage tank 12-1, a return pipe 12-6 leading into the slurry storage tank 12-1 is connected at the overflow port 12-5, and the size of the slurry injection port 12-4 is equal to the size of the feed port of the slurry injection pump 14; a plurality of stirring blades are arranged in the pulp storage tank 12-1, and the angles of the stirring blades positioned at two sides of the pulp pump 12-3 are opposite.
As shown in fig. 2 and 3, the inert slurry synchronous grouting system comprises a third extrusion pump 16 arranged at the discharge port of the thick slurry truck 13, an inert slurry tank 14 and an inert slurry grouting pump 15 arranged at the discharge port of the inert slurry tank 14, wherein the inert slurry grouting pump 15 is provided with a slurry outlet which is controlled independently, a pipeline of the slurry outlet is divided into two grouting pipelines at a shield body, and the pipelines perform shield body grouting through radial straight holes of the shield body. The inert slurry tank 14 is composed of a tank body 14-1 and a stirring device 14-2 arranged in the tank body, wherein a slurry outlet 14-3 is formed in the bottom of the tank body 14-1, a slurry inlet 14-5 and a plurality of observation windows 14-4 are formed in the tank body 14-1, the slurry inlet is formed in the top of the tank body 14-1, three observation windows 14-4 are equidistantly arranged, the slurry outlet 14-3 is formed in the center of the bottom of the tank body 14-1 and corresponds to the middle observation window 14-4, and the slurry inlet 14-3 is conveniently cleaned by entering the observation window 14-4, so that blockage is avoided; as shown in fig. 4, a plurality of stirring blades 13-1 with identical directions are arranged in the slurry storage tank of the thick slurry truck 13, and the slurry storage tank of the thick slurry truck 13 is communicated with the slurry inlet 14-5 of the inert slurry tank 14 through a third extrusion pump 16 and a slurry conveying pipe. The discharge hole of the thick slurry truck 13 is arranged at the bottom of the tail end of the slurry storage tank, as shown in fig. 6, a stirring main shaft 13-2 is horizontally arranged in the slurry storage tank, each stirring blade 13-1 consists of a stirring shaft and blades arranged at the end part of the stirring shaft, and the blades of each stirring blade have the same inclination angle and face the direction of the slurry outlet; the stirring blades 13-1 are uniformly dispersed on the stirring main shaft 13-2, and the included angle between the stirring shaft of each stirring blade and the stirring main shaft 13-2 is the same; as shown in FIG. 5, the stirring device 14-2 in the inert slurry tank 14 is composed of a stirring rotating shaft 14-21 transversely arranged in the tank 14-1, blades 14-23 spirally distributed on the stirring rotating shaft (14-21) and a reducing motor 14-22 arranged outside the tank 14-1.
Embodiment one: the embodiment aims at the heavy section of the Shenzhen international conference center, the stratum of the shield section penetrates through four subway operation lines in the upper soft stratum and the lower hard stratum, the sedimentation control requirement is extremely high, and the shield construction difficulty is high. The settlement control of the upper soft stratum and the lower hard stratum is a great difficulty in the field of shield construction, and the upper soft stratum and the lower hard stratum are penetrated by the existing line, so that the construction difficulty is greater. Shenzhen has projects penetrating through non-operated ground iron wires in similar stratum, the sedimentation control is seriously out of standard, and the post-treatment difficulty and the cost are high. The inventor adopts the method of the invention to carry out timely radial grouting, and the specific process steps are as follows:
(1) Preparing novel inert slurry for synchronous grouting: the materials of the synchronous grouting slurry were prepared according to the following formulation:
wherein, the fly ash and bentonite are bulk fly ash, the materials are stirred by adopting a modified stirring device, and the quality of the fly ash and sand is strictly controlled during stirring so as to ensure the fluidity of slurry.
(2) The novel inert slurry prepared in the step (1) is conveyed into a thick slurry tank 8 through a first extrusion pump 10 of a thick slurry conveying port 5 of a stirring device aggregate bin 2, then is conveyed into a thick slurry vehicle 13 through a second extrusion pump 7-1 of a discharge port of the thick slurry tank 8, the thick slurry vehicle 13 is conveyed to a first section trolley through a tunnel track, and the novel inert slurry is conveyed into an inert slurry tank 14 through a third extrusion pump of a discharge port of the thick slurry vehicle to prepare for a shield synchronous grouting process;
(3) Preparing mortar slurry for synchronous grouting of a conventional shield in a stirring device, pumping the prepared mortar into a mortar tank 7 through a second mortar pump of a mortar conveying port 4 of aggregate bin sand 2 of the stirring device, and then conveying the mortar into a first and second storage tanks 12-1 of a mortar truck for synchronous grouting of shield tail mortar through a second extrusion pump 7-1 of a discharge port of the mortar tank to prepare for synchronous grouting of the shield tail mortar;
(4) In the tunneling process, every tunneling a ring, carrying out conventional shield tail mortar synchronous grouting through a mortar grouting pump 14 of a shield tail mortar grouting system, and simultaneously carrying out shield body grouting on novel inert slurry in an inert slurry tank 14 from two radial straight holes closest to 12 points of a shield body through an inert slurry grouting pump 15 to fill a gap between the shield body and a soil body, wherein the grouting amount of the novel inert slurry for each pushing ring pipe slice is the volume of the gap between the shield body and the soil body with the width of one ring pipe slice;
(3) When the ground subsidence is increased or the phenomenon of over square appears, namely judging that a cavity appears above a cutter disc or a shield body, further supplementing and injecting novel inert slurry through radial straight holes (two radial holes closest to 12 points) of the shield body, rapidly realizing filling of a collapse area through extrusion, preventing further expansion of subsidence, reducing generated subsidence and quite ideal effect on subsidence control; the grouting amount is not less than the excess amount, the grouting pressure control value is the control pressure of the upper part of the soil bin, the sedimentation value is monitored at the same time, and when the sedimentation value is not increased any more and slightly reduced, emergency filling grouting is stopped;
when the shield passes through an important building, settlement data is provided through automatic monitoring, meanwhile, stroke management (namely tunneling management stroke corresponding to each bucket of dregs) is finished when the dregs are discharged, and emergency filling grouting is needed no matter whether the settlement data are increased or the excess occurs.
By the mode, ground subsidence can be effectively controlled by synchronous grouting, and the phenomenon that ground subsidence occurs due to the fact that gaps outside a shield body cannot be filled in time is avoided.
Claims (10)
1. A novel slip casting system for effectively controlling ground subsidence, its characterized in that: the grouting system comprises a slurry stirring device, a slurry conveying device, a shield tail synchronous grouting system and an inert slurry synchronous grouting system, wherein the slurry stirring device comprises a first storage tank (1), an aggregate bin (2) and a stirring station (19) communicated with a feed inlet of the first storage tank (1), a slurry conveying opening (4) with a control valve and a thick slurry conveying opening (5) are respectively arranged at the bottom of the aggregate bin (2), the slurry conveying opening (4) is connected with a second slurry pump (9) through a slurry pipe, and a first extrusion pump (10) is connected with the thick slurry conveying opening (5) through a slurry pipe; the slurry conveying device comprises a slurry tank (7), a thick slurry tank (8), a slurry vehicle (12) and a thick slurry vehicle (13), wherein second extrusion pumps (7-1) are arranged at discharge holes of the slurry tank (7) and the thick slurry tank (8), a feed inlet of the slurry tank (7) is communicated with the second slurry pump (9) through a slurry conveying pipe, the discharge hole is directly communicated with a shield tail synchronous grouting system through the second extrusion pump (7-1), the feed inlet of the thick slurry tank (8) is communicated with the first extrusion pump (10) through the slurry conveying pipe, and a ground pump (11) is arranged on the thick slurry conveying pipe between the thick slurry tank (8) and the first extrusion pump (10); the inert slurry synchronous grouting system comprises a third extrusion pump (16) arranged at a discharge hole of a thick slurry vehicle (13), an inert slurry tank (14) and an inert slurry grouting pump (15) arranged at the discharge hole of the inert slurry tank (14), wherein the inert slurry tank (14) consists of a tank body (14-1) and a stirring device (14-2) arranged in the tank body, a slurry outlet (14-3) is arranged at the bottom of the tank body (14-1), and a slurry inlet (14-5) and a plurality of observation windows (14-4) are formed in the tank body (14-1); a plurality of stirring blades (13-1) with the same direction are arranged in a slurry storage tank of the thick slurry vehicle (13), and the slurry storage tank of the thick slurry vehicle (13) is communicated with a slurry inlet (14-5) of an inert slurry tank (14) through a third extrusion pump (16) and a slurry conveying pipe; the shield tail synchronous grouting system comprises a trolley mortar tank (17), a mortar grouting pump (18) and a mortar pumping pump (12-3) arranged at a discharge hole of the mortar trolley, wherein the mortar trolley (12) is directly communicated with the mortar grouting pump (18); or is communicated with a feed inlet of the trolley mortar tank (17); or respectively communicated with the mortar grouting pump (18) and the feeding port of the trolley mortar tank (17) through a branch pipeline, and a three-way control valve is arranged on the branch pipeline.
2. A novel grouting system for effectively controlling ground subsidence as claimed in claim 1, wherein: when the mortar truck (12) is directly communicated with the mortar grouting pump (18) or is simultaneously communicated with the mortar grouting pump (18) and the trolley mortar tank (17), a storage hopper (12-2) is arranged in a second storage tank (12-1) of the mortar truck (12), a grouting port (12-4) directly connected with the mortar grouting pump (18) is arranged at the bottom of the storage hopper (12-2), an overflow port (12-5) is formed in the position, higher than the second storage tank (12-1), of the storage hopper (12-2), and a grouting pump (12-3) of the mortar truck (12) is led into the storage hopper (12-2) through a mortar conveying pipe, and a grouting pipe communicated with the mortar grouting pump (18) is arranged at the grouting port (12-4).
3. A novel grouting system for effectively controlling ground subsidence as claimed in claim 2, wherein: the mortar grouting pump (18) is provided with two independently controlled mortar outlets, and pipelines of the two mortar outlets are divided into four shield tail synchronous mortar grouting pipes at the shield tail; the inert slurry grouting pump (15) is provided with a slurry outlet which is controlled independently, a pipeline of the slurry outlet is divided into two grouting pipelines at the shield body, and the pipelines perform shield body grouting through radial straight holes of the shield body.
4. A novel grouting system for effectively controlling ground subsidence as claimed in claim 3, wherein: when the first storage tank (1) and the aggregate bin (2) are in an integrated or separated state, a first slurry pump (3) is arranged at a discharge hole of the first storage tank (1) and is communicated with a feed hole of the aggregate bin (2) through a feed liquid conveying pipe; a vibration pump (6) is arranged on the discharging hopper of the aggregate bin (2).
5. A novel grouting system for effectively controlling ground subsidence as claimed in claim 3, wherein: the mortar tanks (7) are one or more mortar tanks (7) connected in series, and a second extrusion pump (7-1) is arranged at the discharge port of each mortar tank (7).
6. A novel grouting system for effectively controlling ground subsidence as claimed in claim 3, wherein: the discharge hole of the thick slurry vehicle (13) is arranged at the bottom of the tail end of the slurry storage tank, a stirring main shaft (13-2) is horizontally arranged in the slurry storage tank, each stirring blade (13-1) consists of a stirring shaft and blades arranged at the end part of the stirring shaft, and the blades of each stirring blade have the same inclination angle and face the direction of the slurry outlet; the stirring blades (13-1) are uniformly dispersed on the stirring main shaft (13-2), and the included angle between the stirring shaft of each stirring blade and the stirring main shaft (13-2) is the same; the stirring device (14-2) in the inert slurry tank (14) consists of a stirring rotating shaft (14-21) transversely arranged in the tank body (14-1), blades (14-23) spirally distributed on the stirring rotating shaft (14-21) and a reducing motor (14-22) arranged outside the tank body (14-1).
7. A novel grouting system for effectively controlling ground subsidence as claimed in claim 3, wherein: the discharge hole of the mortar truck (12) is arranged at the central position of the bottom of the second storage tank (12-1), the mortar pump (12-3) is arranged at the discharge hole, the storage hopper (12-2) is arranged at the top end of the tail part of the second storage tank (12-1) and is partially higher than the second storage tank (12-1), and the lower part of the storage hopper is funnel-shaped; the overflow port (12-5) is arranged at the part of the storage hopper (12-2) higher than the second storage tank (12-1), a return pipe (12-6) leading into the second storage tank (12-1) is connected at the overflow port (12-5), and the size of the grouting port (12-4) is equal to the size of the feed port of the mortar grouting pump (18); a plurality of stirring blades are arranged in the second storage tank (12-1), and the angles of the stirring blades positioned at two sides of the pulp pumping pump (12-3) are opposite.
8. A novel grouting process for effectively controlling ground subsidence, which is characterized in that the grouting process adopts the grouting system of any one of claims 1 to 3 for grouting, and comprises the following specific steps:
(1) Preparing a novel inert slurry for synchronous grouting according to the following formula, wherein the mass percentages of all substances are as follows: 4-8% of lime, 40-50% of sand, 20-30% of fly ash, 2-4% of bentonite and 20-30% of water; wherein the fly ash adopts class F secondary; bentonite adopts sodium-based soil secondary; placing the substances in a stirring device to stir to prepare novel inert slurry;
(2) Conveying the novel inert slurry prepared in the step (1) into a thick slurry tank through a first extrusion pump of a thick slurry conveying port of a bone stock bin of a stirring device, conveying the novel inert slurry to a thick slurry vehicle through a second extrusion pump of a discharge port of the thick slurry tank, conveying the thick slurry vehicle to a first section trolley through a tunnel track, and conveying the novel inert slurry into the inert slurry tank through a third extrusion pump of the discharge port of the thick slurry vehicle to prepare for a shield synchronous grouting process;
(3) Preparing a conventional mortar slurry for shield synchronous grouting in a stirring device, pumping the prepared mortar into a mortar tank through a second mortar pump at a mortar conveying port of a bone stock bin of the stirring device, and then conveying the mortar into a slurry storage device of a shield tail mortar synchronous grouting system through a second extrusion pump at a discharge port of the mortar tank to prepare a shield tail synchronous grouting process;
(4) In the tunneling process, every tunneling one ring, conventional shield tail mortar synchronous grouting is performed through a shield tail mortar grouting system, simultaneously, shield body grouting is performed through two radial straight holes closest to 12 points of a shield body through an inert slurry grouting pump, gaps between the shield body and soil bodies are filled, and grouting amount of the novel inert slurry for each pushing ring pipe slice is the volume of the gap between the shield body and the soil bodies with the width of one ring pipe slice.
9. A novel grouting process for effectively controlling ground subsidence as claimed in claim 8, wherein: providing settlement data through automatic monitoring when the shield tunneling in the step (4) passes through the construction, simultaneously, performing travel management when the dregs are discharged, performing emergency filling grouting when the settlement data are increased or the dregs are overturned, simultaneously monitoring the settlement value in the emergency filling grouting process, and stopping the emergency filling grouting when the settlement value is not increased and is reduced; the emergency filling grouting is to perform shield grouting on novel inert slurry in a trolley slurry storage tank through an inert slurry grouting pump and two radial straight holes closest to 12 points of a shield cutter head, wherein grouting pressure control value is control pressure of the upper part of a soil bin; the grouting quantity is controlled according to the excess quantity, wherein the excess quantity is the actual slag discharging quantity minus the theoretical slag discharging quantity calculated according to the actual management stroke of the shield machine.
10. A novel grouting process for effectively controlling ground subsidence as claimed in claim 8, wherein: the mortar conveyed by the mortar tank in the step (3) can be directly stored in a mortar vehicle storage tank, and shield tail mortar synchronous grouting is directly carried out; or the mortar is conveyed into a trolley mortar storage tank through a mortar vehicle to perform shield tail mortar synchronous grouting in a conventional mode.
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| CN201810049206.1A CN108060931B (en) | 2018-01-18 | 2018-01-18 | Novel grouting system and grouting process for effectively controlling ground subsidence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2635799B1 (en) * | 1988-08-26 | 1992-04-03 | Montcocol | METHOD AND DEVICE FOR LAYING DOWN UNDERGROUND PIPES |
| CN102108872A (en) * | 2009-12-25 | 2011-06-29 | 上海市基础工程有限公司 | Grouting replacement process for DOT (Double-O-Tube) shield machine |
| CN202001023U (en) * | 2011-04-07 | 2011-10-05 | 中铁十一局集团城市轨道工程有限公司 | Improved shield machine grouting pipeline system |
| CN203685216U (en) * | 2014-01-20 | 2014-07-02 | 中铁二十四局集团上海铁建工程有限公司 | Composite grouting system for shield passing-through section |
| CN106150521A (en) * | 2016-06-29 | 2016-11-23 | 上海朗兆公路铁路养护工程技术有限公司 | A kind of construction method preventing and treating uneven changeover portion duct pieces of shield tunnel cracking |
| CN107165642A (en) * | 2017-06-06 | 2017-09-15 | 中铁十九局集团轨道交通工程有限公司 | Accurately control the shield construction method of ground settlement |
| CN207740011U (en) * | 2018-01-18 | 2018-08-17 | 中铁十一局集团城市轨道工程有限公司 | Novel slurry filling system for effectively controlling surface subsidence |
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