CN105239561A - Long spiral mix spray pre-grouting press concrete post-inserted steel reinforcement cage cast-in-place pile construction process - Google Patents
Long spiral mix spray pre-grouting press concrete post-inserted steel reinforcement cage cast-in-place pile construction process Download PDFInfo
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- CN105239561A CN105239561A CN201510553111.XA CN201510553111A CN105239561A CN 105239561 A CN105239561 A CN 105239561A CN 201510553111 A CN201510553111 A CN 201510553111A CN 105239561 A CN105239561 A CN 105239561A
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Abstract
The invention discloses a long spiral mix spray pre-grouting press concrete post-inserted steel reinforcement cage cast-in-place pile construction process. The characteristic that a drill bit and a drilling tool of a modified long spiral rotary jet mixing pile machine can better adapt to hard soil layers is utilized, and undisturbed soil layers are subjected to rotary jet and stirring on site; cement paste is added while stirring, after the designed pile bottom elevation is reached, a long spiral drilling tool hose is connected with a pit pump conveying pipe, and concrete starts to be pumped to reach the designed pile top elevation; and a steel reinforcement cage and a conveying device are lifted through a crane, the steel reinforcement cage is placed into the concrete medially, and a steel reinforcement concrete cast-in-place pile body provided with a concrete paste shell is formed. The construction process has the advantages that both the pile bottom and the pile side of the long spiral pore-forming press concrete post-inserted steel reinforcement cage cast-in-place pile are wrapped by the concrete paste, and a clear limit between the pile and the soil is eliminated, so that compared with a compressive pile or an uplift pile formed through an existing pile forming method, the bearing capacity of the pile is improved. Meanwhile, the construction, which is difficult originally, on sandy gravel soil layers can be easy.
Description
Technical field
The present invention relates to after a kind of long spire stirs spray pre-pouring grout guncreting and insert reinforcing cage construction process of bored concrete pile, for the pile in building foundation construction, particularly foundation pile, comprises the construction of compressive pile, resistance to plucking anti-floating pile and slope protection pile.
Background technology
At present, in the foundation basic construction of Industrial and Civil Engineering, the plain concrete pile utilizing the ancillary facilities such as long-spiral drilling machine, commercial concrete, concrete pump and elephant trunk to carry out or the device of CFG pile driving construction obtain and use widely.This device adopts long-spiral drilling machine pore-forming, and utilizes the central tube of long spire drilling tool to pump at the bottom of hole by High Pressure Reinforced Concrete, and then Ya Guan limit in limit promotes spiral drill, and pore-forming of working continuously once completes, and forms CFG pile composite foundation.Its do mechanization operation degree is high, and speed of application is fast, and cost is low, and for having the bad ground of boulder and cobble, quicksand, underground water can reach reverse circulation, Churn drill, revolving and dig and superior degree that manually digging hole etc. is incomparable.Become pile body be high pressure pump into concrete properties pressure fill with plain concrete pile, pile body concrete bodies is even, have certain dense extrusion effect to soil around pile, and the fullness coefficient of pile body is large, and the relation between pile body and the soil body is improved, and then improve soil around pile frictional resistance force value, increasing the supporting capacity of pile body, is a kind of noiselessness risen in recent years, mud-less pollution, shockproof, high in technological content environment-friendly type construction equipment.On this basis, people have invented again insertion reinforcing cage technology and conveying device thereof, thus make this technology range of application wider, pattern foundation pit supporting structure slope protection pile, foundation pile, uplift pile etc. can be widely used in, be particularly suitable for the stake that expanded diameter is φ 300 ~ φ 800mm.Utilizing that this patented technology is maximum can by long for stake 30m, under the reinforcing cage of the stake of stake footpath φ 800mm on earth.Especially containing underground water, quicksand, the boulder and cobble even stratum of erratic boulder, show that specific rotation digs, Churn drill, reverse circulation bore or manually digging hole is superior performance, and achieve civilized construction, reduce cost, shorten the duration.It is a kind of superior environmental protection construction equipment.Especially comparing with traditional process such as mud off reverse circulation, Churn drill, is a revolutionary change.
How to improve its bearing capacity further on this basis? someone have studied post-grouting technology for this reason, post-grouting technology obtains successful Application at mud pore-forming tremie concrete castinplace pile, but after long auger guncreting, insert the application of not succeeding in reinforcing cage castinplace pile, basic reason be after rear slotting reinforcing cage concrete to wrap up concrete strength in addition high, slip casting is difficult to splitting.And grouting behind shaft or drift lining can only be go toward the passage that pressure is low, cannot ensure that whole contact surface can have grouting behind shaft or drift lining liquid.
Document is had to show, the interface of stirring or churning cement-soil oil and pile is not obvious, thus make its side frictional resistance equal 5 times of side frictional resistance of reinforced concrete pile and soil, this feature determines stirring concrete earth pile, churning cement earth pile or jet mixing cement earth pile if brought into play by its side frictional resistance, and its bearing capacity will improve greatly.In same bearer power situation, stake just can be shortened, or radical reduces, and constructability, can ensure the quality of products and progress, also incites somebody to action economical environment-protective more.
Summary of the invention
The object of the invention is to provide after a kind of long spire stirs spray pre-pouring grout guncreting and inserts reinforcing cage construction process of bored concrete pile, and wrap up concrete strength in addition with concrete after solving rear slotting reinforcing cage that prior art exists high, slip casting is difficult to splitting; And grouting behind shaft or drift lining can only be go toward the passage that pressure is low, cannot ensure the problem that whole contact surface can have grouting behind shaft or drift lining liquid.
In order to solve the problem, the present invention take technical scheme be:
A kind of long spire inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, and it is characterized in that, its technological process is: surveying setting-out fixed pile → driller insertion hole → creep into stir with spray → coagulation soil pressure fills with → reinforcing cage inserts.
Described creeping into stirs to obtain method with spray: according to design mark the degree of depth, rig, in boring procedure, keeps screw rod uniform rotation, at the uniform velocity lower brill, and mud of taking to spray water with high pressure makes cement paste and soil stir in hole mixes and stirs, ensure that whole stake is stirred fully, evenly, guaranteed the quality of rotating spraying mixture pile.
Described coagulation soil pressure irrigation method: after long-spiral drilling machine gets into design elevation, turn on pump carries the concrete be up to the standards, 20 ~ 30cm at the bottom of apex point lift-off hole, want in process continuously, run into termination of pumping or concrete can not without interruption time, should activity at set intervals once, or under beating pump number, avoid concrete coagulation; Fill with to aperture place, avoid during lower cage, falling into earth and cause folder mud.
Described reinforcing cage insertion method:
1) reinforcing cage and core pipe and vibrating hammer form reinforcing cage and send into system, and offset bottom core pipe lower end and reinforcing cage, reinforcing cage top is connected by flange with vibrating hammer;
2) want special messenger's righting during man-hole opening under reinforcing cage, mating holes center, then slowly transfers reinforcing cage, hangs in process and keeps the vertical of reinforcing cage;
3), after reinforcing cage bottom enters concrete, first under the Gravitative Loads of reinforcing cage and vibrating hammer, slowly reinforcing cage is transferred; After reinforcing cage is transferred to and can not naturally be sunk, open vibrating hammer, the carrying out with vibration controls reinforcing cage and enters concrete height; In vibration processes, guarantee that the wire rope lifting reinforcing cage is with power all the time, in case reinforcing cage tilts to insert; Stop vibration after arriving design height, extract core pipe.
Transfer in order to ensure reinforcing cage and put in place, adopt the vibration-sunk device of powerful vibrating hammer and the stronger vibration core tube composition of rigidity to carry out reinforcing cage and transfer.
Described creeps into and sprays the preparation of stirring the cement paste used in technique: according to Different Strata, groundwater table, select dissimilar cement, determine different water/binder ratio, final water/binder ratio should be determined by designing requirement and field trial, generally water/binder ratio optional 1.0 ~ 1.5, can add appropriate additive (can adopt flyash 5 ~ 10% mass ratio) according to actual conditions in addition; Put to pulp storage tank after 60 orders filter with thin vibrosieve after stirring.
Described creeping into is stirred in technique with spray, determines to carry, running speed according to soil layer, water level conditions, and utilize frequency converter to be regulated in advance, limit is bored under Pen Jiao limit, reaches projected depth; Cement paste Stress control at 10 ~ 20MPa, slurry flow according to creeping into actual speed, sub-surface quality event adjusts.
Described coagulation soil pressure fills with the concrete compound method used in technique: concrete material is water, cement, sandstone and additive, additive comprises early strength admixture, the ratio of four kinds of materials meets intensity and slump requirement, and the slump requires to be generally 200 ~ 240mm; Control husky cobble-stone diameter and be not more than 20mm; For meeting workability needs and industrial waste utilization, mixing flyash 5 ~ 10% mass ratio in right amount, also there is low strength cement effect simultaneously.
Described fabrication of reinforcing cage method:
1) physical dimension meets the requirements: adopt Mold Making to ensure that main reinforce position is accurate, become hole perpendicularity good, distortionless phenomenon, physical dimension allowable variation;
2) reinforcing cage arranges protective device, guarantees thickness of protection tier;
3) main tendon protective layer thickness: main tendon protective layer thickness allowable variation ± 20mm, this topping is the part beyond concrete parcel reinforcing cage, naturally form topping after plugging in cage;
4) main muscle rust cleaning, straightening, enhancing steel ring requires as circular, main muscle joint adopts straight screw sleeve to connect, joint should stagger mutually, within the scope of the section of 35 times of main muscle diameters, this scope is not less than 500mm, and a main muscle must not have 2 joints, and 50% of the no more than main muscle radical of same cross section joint number;
5) the main muscle lap joint of reinforcing bar adopts JM peel rolled straight thread branch sleeve to connect.
Advantage of the present invention is: insert stake side at the bottom of the stake of the castinplace pile of reinforcing cage after realizing long spire pore-forming guncreting and all can be wrapped up by cement grout, make between oil and pile, to no longer include obvious boundary, thus the compressive pile that the more existing piling method of its bearing capacity is formed or uplift pile improve all greatly.Also can make originally to run into the very difficult situation of sand-pebble layer construction simultaneously and also can become easy.Existing technique may be that sandy gravel causes concrete bleed " dry " to cause reinforcing cage to be inserted into projected depth due to stratum, and have employed the first grouting process of the present invention and can make concrete no longer " dry ", thus reinforcing cage is inserted become easy.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Detailed description of the invention
See Fig. 1, long spire of the present invention inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, and the main material of use has reinforcing bar, high slump granule concrete etc.
Reinforcing bar should have formal product certificate, retrial return on qualification.Concrete is high slump granule concrete, and the slump is generally 200 ~ 240mm.Coarse aggregate size is not more than 20mm.
Concrete work progress is as follows:
1, surveying setting-out fixed pile:
First surveying setting-out fixed pile on smooth location, guide pile carried out by two ends measuring apparatus, checks at any time when preventing stake position from occurring deviation; Fixed pile normally makes a call to a deep hole on the ground with drill rod or card punch, pours into albarium powder, and in stake position, the distinguishing marks such as reinforcing rod are plugged at place.
2, driller insertion boring:
Utilize two-wire hammer into shape method respectively from both sides to rig leveling, ensure rig level, adjust the perpendicularity deviation of drilling tool simultaneously within specification allowed band.Can take to hole in turn or " jump and beat " (hole or multiple hole can be jumped) depending on soil layer, water level, local environmental conditions.
3, creep into and stir with spray:
According to design, the degree of depth mark by institute, and rig, in boring procedure, keeps screw rod uniform rotation, bores at the uniform velocity down, and takes high-pressure mortar spraying in hole, make cement-soil stir to mix and stir, ensure that whole stake is stirred abundant, even, guarantee the quality of rotating spraying mixture pile.
1) preparation of cement paste: according to Different Strata, groundwater table, select dissimilar cement, determine different water/binder ratio, final water/binder ratio should be determined by designing requirement and field trial, generally water/binder ratio optional 1.0 ~ 1.5, can add appropriate additive according to actual conditions in addition.Put to pulp storage tank after 60 orders filter with thin vibrosieve after stirring.
2) determine to carry according to soil layer, water level conditions, running speed, utilize frequency converter to be regulated in advance.Limit is bored under Pen Jiao limit, reaches projected depth.Slurry pressure controls 10 ~ 20MPa, slurry flow according to creeping into actual speed, sub-surface quality event adjusts.
4, concrete preparation:
Agitator must carry out retrial to the cement entered the station, sandstone and additive, can use after qualified.Especially be required to meet long screw auger pressure deposited to the slump to use, be generally 200 ~ 240mm, control coarse aggregate size and be not more than 20mm.For meeting workability needs and industrial waste utilization, mixing flyash in right amount, also having low strength cement effect simultaneously.
5, fabrication of reinforcing cage:
1) physical dimension meets the requirements: adopt Mold Making to ensure that main reinforce position is accurate, become hole perpendicularity good, distortionless phenomenon, physical dimension allowable variation:
(a) main muscle spacing ± 10mm
(b) stirrup spacing ± 20mm
(c) diameter ± 10mm
(d) length ± 100mm
2) reinforcing cage arranges protective device, guarantees thickness of protection tier.
3) main tendon protective layer thickness: main tendon protective layer thickness allowable variation ± 20mm.
4) main muscle rust cleaning, straightening, enhancing steel ring requires positive garden, and main muscle joint adopts straight screw sleeve to connect, and joint should stagger mutually.Be main muscle diameter at 35d(d) section within the scope of (being not less than 500mm), a reinforcing bar must not have 2 joints, and 50% of the no more than main muscle radical of same cross section joint number.
5) the main muscle lap joint of reinforcing bar adopts JM peel rolled straight thread branch sleeve to connect, main muscle silk head processing, joint group connect and construct in strict accordance with operational procedure, silk head operating personnel must train qualified after take appointment with certificate, and construct in strict accordance with training operational procedure, before joint processing, 3 test specimens should be made and be carried out in accordance with regulations process test, can construct after qualified.In work progress, every 500 joints are an inspection lot, test, on-the-spot inspection 10 batches continuously, whole qualified time, analyzing adapter quantity can expand as 1000.Inspect and filled in steel bar head crudy inspection record table and bar splice quality of connection record.
6, coagulation soil pressure is filled with:
After long-spiral drilling machine gets into design elevation, turn on pump carries the concrete be up to the standards, 20 ~ 30cm at the bottom of apex point lift-off hole, want continuously in process, run into termination of pumping or concrete can not without interruption time, should activity at set intervals once, or under beating pump number, avoid concrete coagulation; Fill with to aperture place, avoid during lower cage, falling into earth and cause folder mud.
7, reinforcing cage inserts:
1) reinforcing cage and core pipe and vibrating hammer form reinforcing cage and send into system, and offset bottom core pipe lower end and reinforcing cage, reinforcing cage top is connected by flange with vibrating hammer.
2) want special messenger (2 ~ 3 people) righting under reinforcing cage during man-hole opening, mating holes center, then slowly transfers reinforcing cage, hangs in process and keeps the vertical of reinforcing cage.
3) after reinforcing cage bottom enters concrete, first under the Gravitative Loads of reinforcing cage and vibrating hammer, slowly reinforcing cage is transferred, after reinforcing cage is transferred to and can not naturally be sunk, open vibrating hammer, carrying out with vibration controls reinforcing cage and enters concrete height (in vibration processes, guarantee that the wire rope lifting reinforcing cage is with power all the time, in case reinforcing cage tilts to insert), vibration is stopped after arriving design height, extract core pipe, transfer in order to ensure reinforcing cage and put in place, intend adopting the vibration-sunk device of powerful vibrating hammer and the stronger vibration core tube composition of rigidity to carry out reinforcing cage and transfer.
Adopt the present invention construct formed Novel pile can be applied to resistance to compression, resistance to plucking anti-floating pile, also can be used for slope protection pile (part), and different stratum can be widely used in.Bearing capacity can be significantly improved, and reinforcing cage can be inserted into design elevation smoothly, thus can better play its bearing capacity, the stake that the more existing piling method of its bearing capacity is formed improves greatly, also construction can be made to become easy even if run into the stratum that sandy gravel is difficult to pile, speed of application improves greatly, and quality reaches guarantee; Cost declines greatly.Environmental protection and saving, shows its great superiority.
Claims (9)
1. long spire inserts a reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, and it is characterized in that, its technological process is: surveying setting-out fixed pile → driller insertion hole → creep into stir with spray → coagulation soil pressure fills with → reinforcing cage inserts.
2. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described creeping into stirs to obtain method with spray: according to design mark the degree of depth, rig is in boring procedure, keep screw rod uniform rotation, to bore at the uniform velocity down, and mud of taking to spray water with high pressure makes cement paste and soil stir in hole mixes and stirs, ensure that whole stake is stirred fully, evenly, guaranteed the quality of rotating spraying mixture pile.
3. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described coagulation soil pressure irrigation method: after long-spiral drilling machine gets into design elevation, turn on pump carries the concrete be up to the standards, 20 ~ 30cm at the bottom of apex point lift-off hole, wants continuously in process, run into termination of pumping or concrete can not without interruption time, should activity at set intervals once, or under beating pump number, avoid concrete coagulation; Fill with to aperture place, avoid during lower cage, falling into earth and cause folder mud.
4. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described reinforcing cage insertion method:
1) reinforcing cage and core pipe and vibrating hammer form reinforcing cage and send into system, and offset bottom core pipe lower end and reinforcing cage, reinforcing cage top is connected by flange with vibrating hammer;
2) want special messenger's righting during man-hole opening under reinforcing cage, mating holes center, then slowly transfers reinforcing cage, hangs in process and keeps the vertical of reinforcing cage;
3), after reinforcing cage bottom enters concrete, first under the Gravitative Loads of reinforcing cage and vibrating hammer, slowly reinforcing cage is transferred; After reinforcing cage is transferred to and can not naturally be sunk, open vibrating hammer, the carrying out with vibration controls reinforcing cage and enters concrete height; In vibration processes, guarantee that the wire rope lifting reinforcing cage is with power all the time, in case reinforcing cage tilts to insert; Stop vibration after arriving design height, extract core pipe.
5. long spire according to claim 4 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, transfer in order to ensure reinforcing cage and put in place, adopt the vibration-sunk device of powerful vibrating hammer and the stronger vibration core tube composition of rigidity to carry out reinforcing cage and transfer.
6. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described creeps into and sprays the preparation of stirring the cement paste used in technique: according to Different Strata, groundwater table, select dissimilar cement, determine different water/binder ratio, final water/binder ratio should be determined by designing requirement and field trial, generally water/binder ratio optional 1.0 ~ 1.5, can add appropriate additive (can adopt flyash 5 ~ 10% mass ratio) according to actual conditions in addition; Put to pulp storage tank after 60 orders filter with thin vibrosieve after stirring.
7. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described creeping into is stirred in technique with spray, determine to carry according to soil layer, water level conditions, running speed, frequency converter is utilized to be regulated in advance, limit is bored under Pen Jiao limit, reaches projected depth; Cement paste Stress control at 10 ~ 20MPa, slurry flow according to creeping into actual speed, sub-surface quality event adjusts.
8. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described coagulation soil pressure fills with the concrete compound method used in technique: concrete material is water, cement, sandstone and additive, additive comprises early strength admixture, the ratio of four kinds of materials meets intensity and slump requirement, and the slump requires to be generally 200 ~ 240mm; Control husky cobble-stone diameter and be not more than 20mm; For meeting workability needs and industrial waste utilization, mixing flyash 5 ~ 10% mass ratio in right amount, also there is low strength cement effect simultaneously.
9. long spire according to claim 1 inserts reinforcing cage construction process of bored concrete pile after stirring spray pre-pouring grout guncreting, it is characterized in that, described fabrication of reinforcing cage method:
1) physical dimension meets the requirements: adopt Mold Making to ensure that main reinforce position is accurate, become hole perpendicularity good, distortionless phenomenon, physical dimension allowable variation;
2) reinforcing cage arranges protective device, guarantees thickness of protection tier;
3) main tendon protective layer thickness: main tendon protective layer thickness allowable variation ± 20mm, this topping is the part beyond concrete parcel reinforcing cage, naturally form topping after plugging in cage;
4) main muscle rust cleaning, straightening, enhancing steel ring requires as circular, main muscle joint adopts straight screw sleeve to connect, joint should stagger mutually, within the scope of the section of 35 times of main muscle diameters, this scope is not less than 500mm, and a main muscle must not have 2 joints, and 50% of the no more than main muscle radical of same cross section joint number;
5) the main muscle lap joint of reinforcing bar adopts JM peel rolled straight thread branch sleeve to connect.
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Cited By (10)
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| CN105887876A (en) * | 2016-03-28 | 2016-08-24 | 陶明安 | Construction method for cast-in-situ large-diameter combined thin-wall threaded pipe pile and pile forming device of cast-in-situ large-diameter combined thin-wall threaded pipe pile |
| CN106869118A (en) * | 2017-04-11 | 2017-06-20 | 安徽理工大学 | A kind of first grouting picket construction technology |
| CN106894425A (en) * | 2017-03-11 | 2017-06-27 | 窦春晓 | A kind of conjuncted CS pile tubes foundation pit supporting construction of major diameter and its construction method |
| CN107237322A (en) * | 2017-07-18 | 2017-10-10 | 北京中润宝成工程技术有限公司 | A kind of method that long auger rear inserting cage bored concrete pile efficiently inserts vibrating tube |
| CN108612087A (en) * | 2018-05-10 | 2018-10-02 | 江苏地基工程有限公司 | A kind of novel long screw auger pore pressure fills the construction technology of support pile |
| CN109680695A (en) * | 2018-12-17 | 2019-04-26 | 北京建材地质工程有限公司 | Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger |
| CN112392709A (en) * | 2021-01-12 | 2021-02-23 | 西南交通大学 | Roadbed grouting lifting control method, device and equipment and readable storage medium |
| CN113136885A (en) * | 2021-04-02 | 2021-07-20 | 远强地基工程(天津)股份有限公司 | Cement soil waterproof curtain construction process with desulfurized gypsum cement as curing agent |
| CN114837171A (en) * | 2022-04-24 | 2022-08-02 | 中煤地质集团有限公司 | Construction method of dry sand gravel stratum cast-in-place pile |
| CN114875903A (en) * | 2022-05-13 | 2022-08-09 | 东南大学 | Pile tip rotary spraying grouting and synchronous stirring integrated construction device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105887876A (en) * | 2016-03-28 | 2016-08-24 | 陶明安 | Construction method for cast-in-situ large-diameter combined thin-wall threaded pipe pile and pile forming device of cast-in-situ large-diameter combined thin-wall threaded pipe pile |
| CN106894425A (en) * | 2017-03-11 | 2017-06-27 | 窦春晓 | A kind of conjuncted CS pile tubes foundation pit supporting construction of major diameter and its construction method |
| CN106869118A (en) * | 2017-04-11 | 2017-06-20 | 安徽理工大学 | A kind of first grouting picket construction technology |
| CN107237322A (en) * | 2017-07-18 | 2017-10-10 | 北京中润宝成工程技术有限公司 | A kind of method that long auger rear inserting cage bored concrete pile efficiently inserts vibrating tube |
| CN108612087A (en) * | 2018-05-10 | 2018-10-02 | 江苏地基工程有限公司 | A kind of novel long screw auger pore pressure fills the construction technology of support pile |
| CN109680695A (en) * | 2018-12-17 | 2019-04-26 | 北京建材地质工程有限公司 | Bore forming technique is perfused in anhydrous thickness sand cobble stratum long auger |
| CN112392709A (en) * | 2021-01-12 | 2021-02-23 | 西南交通大学 | Roadbed grouting lifting control method, device and equipment and readable storage medium |
| CN113136885A (en) * | 2021-04-02 | 2021-07-20 | 远强地基工程(天津)股份有限公司 | Cement soil waterproof curtain construction process with desulfurized gypsum cement as curing agent |
| CN114837171A (en) * | 2022-04-24 | 2022-08-02 | 中煤地质集团有限公司 | Construction method of dry sand gravel stratum cast-in-place pile |
| CN114875903A (en) * | 2022-05-13 | 2022-08-09 | 东南大学 | Pile tip rotary spraying grouting and synchronous stirring integrated construction device and method |
| CN114875903B (en) * | 2022-05-13 | 2023-08-22 | 东南大学 | Pile tip rotary jet grouting and synchronous stirring integrated construction device and method |
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Application publication date: 20160113 |
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