CN104929114A - High pressure jet grouting pile waterproof curtain construction device and method - Google Patents
High pressure jet grouting pile waterproof curtain construction device and method Download PDFInfo
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Abstract
The invention relates to a high pressure jet grouting pile waterproof curtain construction device and method. The device comprises a drilling machine, a machine frame, a high pressure cement slurry pump, an air compressor and a grouting pipe. The machine frame is arranged on the drilling machine. The end of the machine frame is provided with a pulley and connected with the air compressor through a steel wire rope on the pulley. The high pressure cement slurry pump and the grouting pipe are sequentially arranged below the air compressor. A pipe head of the grouting pipe is provided with a spray nozzle and sprays out a jet grouting induration body through the spray nozzle. The method carried out through the device is little influenced by soil layers, soil granularity, soil density, hardener viscidity and hardener hardening time and can be widely applied to various soil layers such as sludge, mucky soil, cohesive soil, silty clay, clay, sandy loam, sandy soil, loess, plain fill in artificial fill and even gravelly soil; by means of the construction technology of directly forming a pile through grouting after hole formation, the hole forming quality is improved, the construction cycle is shortened, and the construction cost is reduced.
Description
[technical field]
The present invention relates to a kind of high-pressure rotary-spray pile water stopping curtain construction equipment and method thereof, belong to water seal for deep foundation pit curtain technical field of construction.
[background technology]
Water seal for deep foundation pit curtain adopts steel concrete campshed as supporting and protection structure, utilizes Pressure Revolving Blast-Grout to make campshed consolidation, be connected with concrete piling, form the airtight barrier that intercepts water.At present in the construction method of traditional water seal for deep foundation pit curtain, adopt churning ram machine construction, need first to draw hole, rear pile, after utilizing the drilling tool of rig that the bit drills with nozzle is proceeded to projected depth, under the effect of high-pressure pump high pressure, by the cement grout of certain water/binder ratio, be pumped to drill bit by high-voltage tube, injected high pressure cement slurries are ejected through nozzle, impact, cut surrounding soil; Drilling tool rotates with certain speed again and promotes simultaneously, and such cement grout action of forced stirring surrounding soil forms cylindrical pile body.Infiltrate because slurries overcome formation resistance in surrounding formation space, rely on cement grout characteristic, solidification stratum, formation strength is improved.When geological condition is complicated, when being especially mingled with a large amount of erratic boulder in boulder bed, when passing through boulder bed, pore-forming difficulty is very large, and speed of application is slow, and then increase the duration of water seal for deep foundation pit curtain construction, thus increase the income of job site personnel, goods and materials machinery and material, cause construction cost to increase.
[summary of the invention]
The object of the invention is to: for defect and the deficiency of prior art, provide a kind of high-pressure rotary-spray pile water stopping curtain construction equipment and method thereof, by these apparatus and method for the large geological stratification of mud, cohesive soil, loess, sand, artificial earth fill and the pore-forming such as boulder bed, shale layer difficulty, adopt the construction technology of directly whitewashing pile after pore-forming, improve hole quality, shorten construction period, reduce construction cost.
For achieving the above object, the technical solution used in the present invention is:
A kind of high-pressure rotary-spray pile water stopping curtain construction equipment of the present invention, comprise rig, frame, high pressure cement stock pump, air compressor machine and Grouting Pipe, rig is provided with frame, the end of frame is provided with pulley, and connect air compressor machine by the wire rope on pulley, the below of air compressor machine is provided with high pressure cement stock pump and Grouting Pipe successively, and the tube head of Grouting Pipe is provided with shower nozzle, and by shower nozzle ejection churning induration.
In the present invention: the cement paste that described high pressure cement stock pump extracts in slurry bucket is transported in Grouting Pipe, wherein the cement paste starched in bucket be by the water in water tank and the cement in cement bin mix according to a certain percentage stirred by mixer after be transported in slurry bucket.
In the present invention: described churning induration comprises hardener main part from inside to outside successively, is uniformly mixed part, compression section and permeate portion.
A kind of high-pressure rotary jet grouting pile waterproof curtain construction method, comprises the following steps:
(1), levelling of the land: remove the obstruction within construction plant below ground 2 meters, that can not remove carries out safeguard measure, then flatten, tamp, reasonable Arrangement construction machinery, transfer pipeline and power circuit position, guarantee " three supplies and one leveling " of construction plant simultaneously;
(2), the setting-out of stake position: measure the control point of jet grouting pile construction, mark of layinging of markstone with total powerstation before construction, through repetition measurement test line qualified after, lay stake position on the spot with steel ruler and survey line, and clench with bamboo let, one one label, guarantee stake holes center shift variance is less than 30mm;
(3), build blowdown and mortar mixing system: will produce in jet grouting pile construction process 10 ~ 20% return slurry amount, introduced by waste pulp in sedimentation basin, the clear water after precipitation can carry out nuisanceless discharge according to site condition; Mortar mixing system is mainly arranged near cement, is convenient to operation, primarily of mortar mixing equipment, mortar storage facilities, slurry delivery equipment composition;
(4), driller insertion: flatten rig, place steady, level, the perpendicularity deviation of drilling rod is not more than 1% ~ 1.5%, after in place, first carries out 0.5MPa low pressure hose test, and in order to check that whether nozzle is unimpeded, whether pressure is normal;
(5), preparing cement paste: during driller insertion, namely starting by designing the match ratio 1:1 mixing cement paste determined; First water is added in bucket, again cement is poured into, start mixer to stir 10 ~ 20 minutes, then turn on agitator bottom valve, putting into aperture is flow into slurry pool after the first screen filtration of 0.8mm, then being drawn into aperture by slush pump is 0.8mm second screen pack, and second time flows in slurries bucket after filtering, for subsequent use when mud jacking;
(6), draw hole drill to enter: during construction, first creep into the hole of diameter 110mm with rig, boring extends lower 1.5 meters of medium weathering rock stratum, and checks and accepts in time, will record drilling rod joint number in detail in boring procedure, ensures the accurate of drilling depth;
(7), intubate: when carrying out bore operation, boring and intubate two procedure can integrate, and when in first stage injection soil, by the injection of Grouting Pipe itself or can vibrate injection; Its process is: start rig, open high pressure slurry pump low-pressure delivery cement grout simultaneously, drilling rod is sunk along leading truck vibration, jet pore-forming, until design elevation at the bottom of stake, observe operating current and should not be greater than rated value, in catheterization procedure, for preventing silt blocking nozzle, tube edge jetting under the pressure limit that available 0.5 ~ 1.0MPa is less;
(8), hoisting grouting pipe, stir: after Grouting Pipe sinks to arriving projected depth, stopping is crept into, rotate and do not stop, high-pressure slurry pump pressure increases the working design value to 20 ~ 40MPa, after sitting end whitewashing 30s, whitewashing limit, limit rotates, the hoisting velocity simultaneously determined in strict accordance with design and test pile promotes drilling rod, after reaching projected depth, connect air-pressure tube, start slush pump, air compressor machine and rig rotate, and use instrument controlled pressure, flow and air quantity, start when reaching predetermined value respectively to promote, continue churning and lifting, until stop after reaching the reinforcing height of expection,
(9), pile crown part process: when Grouting Pipe promotes close to stake top, from 1.0m below stake top, churning should be promoted at a slow speed, the churning several seconds, more upwards promote 0.5m at a slow speed, until slurry face is stopped on stake top;
(10), gravel reservoir treating: meeting gravel stratum, for ensureing stake footpath, whitewashing can be repeated, until Grouting Pipe is promoted to stop slurry face, close air compressor machine, stop the conveying of cement paste, Grouting Pipe rotary lifting is gone out ground, close rig;
(11), cleaning: inject proper amount of clear water in slurry bucket, open high-pressure pump, clean cement paste remaining in whole pipeline, until substantially clean, the soil sticked on slip casting tube head is cleaned up;
(12), slurry is mended: after jet groutinl operation completes, due to the bleed effect of slurries, generally all have contraction in various degree, make induration top occur depression, in time by the cement paste supplementary irrigation that water/binder ratio is 1.0;
(13), be shifted: mobile stake machine carries out the construction of next pile.
After adopting said method, beneficial effect of the present invention is:
(1) granularity, by soil layer, soil, the density of soil, hardener viscosity, hardener firm time affect little, can be widely used in plain fill in mud, mucky soil, cohesive soil, silty clay, lam, sandy loam, sand, loess and the artificial earth fill even multiple soil layer such as gravelly soil;
(2), adopt dual tube method high-pressure rotary-spray, because adjacent two pile driving constructions distances are too near or interval time is too short during for preventing jet grouting pile construction, grout leaking when causing adjacent high spray orifice construction, takes to jump hole in batches and applies, jump when hole applies and apply by interval of holes;
(3), can be used as the use of the ground stabilization of existing building and new building, also can be used as the use of Foundation Anti-seepage; Can be used as the temporary measure in construction, as deep-foundation side wall gear soil or dash, water protecting curtain etc., also can be used as the ground stabilization of permanent building, Anti-seeping technology;
(4) construction machinery equipment is simple, and easy construction, have good durability, and material source is wide, and cheap, noise is little, pollution-free.
[accompanying drawing explanation]
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, but does not form inappropriate limitation of the present invention, in the accompanying drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is churning induration situation schematic diagram in the present invention.
In figure: 1. air compressor machine; 2. high pressure cement stock pump; 3. Grouting Pipe; 4. shower nozzle; 5. churning induration; 6. starch bucket; 7. water tank; 8. mixer; 9. cement bin; 10. rig; 11. frames; 12. pulleys; 13. wire rope; A. permeate portion; B. compression section; C. part is uniformly mixed; D. hardener main part.
[detailed description of the invention]
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, illustrative examples wherein and explanation are only used for explaining the present invention, but not as a limitation of the invention.
As shown in Figure 1, a kind of high-pressure rotary-spray pile water stopping curtain construction equipment, comprise rig 10, frame 11, high pressure cement stock pump 2, air compressor machine 1 and Grouting Pipe 3, rig 10 is provided with frame 11, the end of frame 11 is provided with pulley 12, and connects air compressor machine 1 by the wire rope 13 on pulley 12, and the below of air compressor machine 1 is provided with high pressure cement stock pump 2 and Grouting Pipe 3 successively, the tube head of Grouting Pipe 3 is provided with shower nozzle 4, and sprays churning induration 5 by shower nozzle 4.The cement paste that described high pressure cement stock pump 2 extracts in slurry bucket 6 is transported in Grouting Pipe 3, wherein the cement paste starched in bucket 6 be by the cement in the water in water tank 7 and cement bin 9 mix according to a certain percentage stirred by mixer 8 after be transported in slurry bucket 6.The pile formation mechanism of high pressure jet grouting comprises following four kinds of effects:
(1) high pressure jet stream cutting damage soil body effect: injection stream dynamic pressure, with the impulse form impact failure soil body, makes the soil body occur hole, soil mass crack is expanded;
(2) mix and blend effect: drilling rod is in rotary lifting process, in formation space, jet rear portion, under expulsion pressure, force grogs towards direction (direction that the namely resistance little) shift position contrary with nozzle moving direction, be mixed to form new structure with slurry agitation;
(3) filling, Seep-Solidifying effect: the space of the groove that the rapid filling of water under high pressure mud is washed open and grogs, bleed consolidation, also can infiltrate layer of sand certain thickness and form induration;
(4) compaction: high pressure jet stream, in cutting and crushing soil layer process, also has surplus pressure at broken adjacent margins, and can produce certain compaction to soil layer, makes the compressive strength of churning pile body marginal portion higher than core.Wherein the structure of churning induration as shown in Figure 2, comprises hardener main part D from inside to outside successively, is uniformly mixed part C, compression section B and permeate portion A.
A kind of high-pressure rotary jet grouting pile waterproof curtain construction method, comprises the following steps:
(1), levelling of the land: remove the obstruction within construction plant below ground 2 meters, that can not remove carries out safeguard measure, then flatten, tamp, reasonable Arrangement construction machinery, transfer pipeline and power circuit position, guarantee " three supplies and one leveling " of construction plant simultaneously;
(2), the setting-out of stake position: measure the control point of jet grouting pile construction, mark of layinging of markstone with total powerstation before construction, through repetition measurement test line qualified after, lay stake position on the spot with steel ruler and survey line, and clench with bamboo let, one one label, guarantee stake holes center shift variance is less than 30mm;
(3), build blowdown and mortar mixing system: will produce in jet grouting pile construction process 10 ~ 20% return slurry amount, introduced by waste pulp in sedimentation basin, the clear water after precipitation can carry out nuisanceless discharge according to site condition; Mortar mixing system is mainly arranged near cement, is convenient to operation, primarily of mortar mixing equipment, mortar storage facilities, slurry delivery equipment composition;
(4), driller insertion: flatten rig, place steady, level, the perpendicularity deviation of drilling rod is not more than 1% ~ 1.5%, after in place, first carries out 0.5MPa low pressure hose test, and in order to check that whether nozzle is unimpeded, whether pressure is normal;
(5), preparing cement paste: during driller insertion, namely starting by designing the match ratio 1:1 mixing cement paste determined; First water is added in bucket, again cement is poured into, start mixer to stir 10 ~ 20 minutes, then turn on agitator bottom valve, putting into aperture is flow into slurry pool after the first screen filtration of 0.8mm, then being drawn into aperture by slush pump is 0.8mm second screen pack, and second time flows in slurries bucket after filtering, for subsequent use when mud jacking;
(6), draw hole drill to enter: during construction, first creep into the hole of diameter 110mm with rig, boring extends lower 1.5 meters of medium weathering rock stratum, and checks and accepts in time, will record drilling rod joint number in detail in boring procedure, ensures the accurate of drilling depth;
(7), intubate: when carrying out bore operation, boring and intubate two procedure can integrate, and when in first stage injection soil, by the injection of Grouting Pipe itself or can vibrate injection; Its process is: start rig, open high pressure slurry pump low-pressure delivery cement grout simultaneously, drilling rod is sunk along leading truck vibration, jet pore-forming, until design elevation at the bottom of stake, observe operating current and should not be greater than rated value, in catheterization procedure, for preventing silt blocking nozzle, tube edge jetting under the pressure limit that available 0.5 ~ 1.0MPa is less;
(8), hoisting grouting pipe, stir: after Grouting Pipe sinks to arriving projected depth, stopping is crept into, rotate and do not stop, high-pressure slurry pump pressure increases the working design value to 20 ~ 40MPa, after sitting end whitewashing 30s, whitewashing limit, limit rotates, the hoisting velocity simultaneously determined in strict accordance with design and test pile promotes drilling rod, after reaching projected depth, connect air-pressure tube, start slush pump, air compressor machine and rig rotate, and use instrument controlled pressure, flow and air quantity, start when reaching predetermined value respectively to promote, continue churning and lifting, until stop after reaching the reinforcing height of expection,
(9), pile crown part process: when Grouting Pipe promotes close to stake top, from 1.0m below stake top, churning should be promoted at a slow speed, the churning several seconds, more upwards promote 0.5m at a slow speed, until slurry face is stopped on stake top;
(10), gravel reservoir treating: meeting gravel stratum, for ensureing stake footpath, whitewashing can be repeated, until Grouting Pipe is promoted to stop slurry face, close air compressor machine, stop the conveying of cement paste, Grouting Pipe rotary lifting is gone out ground, close rig;
(11), cleaning: inject proper amount of clear water in slurry bucket, open high-pressure pump, clean cement paste remaining in whole pipeline, until substantially clean, the soil sticked on slip casting tube head is cleaned up;
(12), slurry is mended: after jet groutinl operation completes, due to the bleed effect of slurries, generally all have contraction in various degree, make induration top occur depression, in time by the cement paste supplementary irrigation that water/binder ratio is 1.0;
(13), be shifted: mobile stake machine carries out the construction of next pile.
The above is only better embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.
Claims (4)
1. a high-pressure rotary-spray pile water stopping curtain construction equipment, it is characterized in that: comprise rig, frame, high pressure cement stock pump, air compressor machine and Grouting Pipe, rig is provided with frame, the end of frame is provided with pulley, and connect air compressor machine by the wire rope on pulley, the below of air compressor machine is provided with high pressure cement stock pump and Grouting Pipe successively, and the tube head of Grouting Pipe is provided with shower nozzle, and by shower nozzle ejection churning induration.
2. a kind of high-pressure rotary-spray pile water stopping curtain construction equipment according to claim 1, it is characterized in that: the cement paste that described high pressure cement stock pump extracts in slurry bucket is transported in Grouting Pipe, wherein the cement paste starched in bucket be by the water in water tank and the cement in cement bin mix according to a certain percentage stirred by mixer after be transported in slurry bucket.
3. a kind of high-pressure rotary-spray pile water stopping curtain construction equipment according to claim 1, is characterized in that: described churning induration comprises hardener main part from inside to outside successively, is uniformly mixed part, compression section and permeate portion.
4. a high-pressure rotary jet grouting pile waterproof curtain construction method, is characterized in that: comprise the following steps:
(1), levelling of the land: remove the obstruction within construction plant below ground 2 meters, that can not remove carries out safeguard measure, then flatten, tamp, reasonable Arrangement construction machinery, transfer pipeline and power circuit position, guarantee " three supplies and one leveling " of construction plant simultaneously;
(2), the setting-out of stake position: measure the control point of jet grouting pile construction, mark of layinging of markstone with total powerstation before construction, through repetition measurement test line qualified after, lay stake position on the spot with steel ruler and survey line, and clench with bamboo let, one one label, guarantee stake holes center shift variance is less than 30mm;
(3), build blowdown and mortar mixing system: will produce in jet grouting pile construction process 10 ~ 20% return slurry amount, introduced by waste pulp in sedimentation basin, the clear water after precipitation can carry out nuisanceless discharge according to site condition; Mortar mixing system is mainly arranged near cement, is convenient to operation, primarily of mortar mixing equipment, mortar storage facilities, slurry delivery equipment composition;
(4), driller insertion: flatten rig, place steady, level, the perpendicularity deviation of drilling rod is not more than 1% ~ 1.5%, after in place, first carries out 0.5MPa low pressure hose test, and in order to check that whether nozzle is unimpeded, whether pressure is normal;
(5), preparing cement paste: during driller insertion, namely starting by designing the match ratio 1:1 mixing cement paste determined; First water is added in bucket, again cement is poured into, start mixer to stir 10 ~ 20 minutes, then turn on agitator bottom valve, putting into aperture is flow into slurry pool after the first screen filtration of 0.8mm, then being drawn into aperture by slush pump is 0.8mm second screen pack, and second time flows in slurries bucket after filtering, for subsequent use when mud jacking;
(6), draw hole drill to enter: during construction, first creep into the hole of diameter 110mm with rig, boring extends lower 1.5 meters of medium weathering rock stratum, and checks and accepts in time, will record drilling rod joint number in detail in boring procedure, ensures the accurate of drilling depth;
(7), intubate: when carrying out bore operation, boring and intubate two procedure can integrate, and when in first stage injection soil, by the injection of Grouting Pipe itself or can vibrate injection; Its process is: start rig, open high pressure slurry pump low-pressure delivery cement grout simultaneously, drilling rod is sunk along leading truck vibration, jet pore-forming, until design elevation at the bottom of stake, observe operating current and should not be greater than rated value, in catheterization procedure, for preventing silt blocking nozzle, tube edge jetting under the pressure limit that available 0.5 ~ 1.0MPa is less;
(8), hoisting grouting pipe, stir: after Grouting Pipe sinks to arriving projected depth, stopping is crept into, rotate and do not stop, high-pressure slurry pump pressure increases the working design value to 20 ~ 40MPa, after sitting end whitewashing 30s, whitewashing limit, limit rotates, the hoisting velocity simultaneously determined in strict accordance with design and test pile promotes drilling rod, after reaching projected depth, connect air-pressure tube, start slush pump, air compressor machine and rig rotate, and use instrument controlled pressure, flow and air quantity, start when reaching predetermined value respectively to promote, continue churning and lifting, until stop after reaching the reinforcing height of expection,
(9), pile crown part process: when Grouting Pipe promotes close to stake top, from 1.0m below stake top, churning should be promoted at a slow speed, the churning several seconds, more upwards promote 0.5m at a slow speed, until slurry face is stopped on stake top;
(10), gravel reservoir treating: meeting gravel stratum, for ensureing stake footpath, whitewashing can be repeated, until Grouting Pipe is promoted to stop slurry face, close air compressor machine, stop the conveying of cement paste, Grouting Pipe rotary lifting is gone out ground, close rig;
(11), cleaning: inject proper amount of clear water in slurry bucket, open high-pressure pump, clean cement paste remaining in whole pipeline, until substantially clean, the soil sticked on slip casting tube head is cleaned up;
(12), slurry is mended: after jet groutinl operation completes, due to the bleed effect of slurries, generally all have contraction in various degree, make induration top occur depression, in time by the cement paste supplementary irrigation that water/binder ratio is 1.0;
(13), be shifted: mobile stake machine carries out the construction of next pile.
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