CN102359105A - Construction equipment for energy-saving pressure scattered cement soil anti-floating pile - Google Patents
Construction equipment for energy-saving pressure scattered cement soil anti-floating pile Download PDFInfo
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- CN102359105A CN102359105A CN2011103368149A CN201110336814A CN102359105A CN 102359105 A CN102359105 A CN 102359105A CN 2011103368149 A CN2011103368149 A CN 2011103368149A CN 201110336814 A CN201110336814 A CN 201110336814A CN 102359105 A CN102359105 A CN 102359105A
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Abstract
The invention provides construction equipment for an energy-saving pressure scattered cement soil anti-floating pile. The construction equipment comprises a frame, the frame is provided with a rotatable drill rod, the lower end of the drill rod is provided with a drill bit, the drill bit is provided with a stirring blade, the lower end of the drill rod is provided with a guniting port, the frame is also provided with a guide rod for inserting an anti-pulling rib into the pile, and a winch for hoisting the anti-floating pile is arranged at the top of the guide rod. The anti-floating pile constructed by adopting the equipment has the advantages of high floating resistance, no pile joint, easily controlled quality, improved construction efficiency and long durability. The purposes of discharging no mud, saving a large amount of steel, shortening the construction period and reducing the engineering cost can be fulfilled.
Description
Technical field
The present invention relates to technical field of civil engineering, particularly foundation and underground structure anti-floating pile driving construction equipment.
Background technology
Along with the high speed development of urban construction, traffic engineering, the development and utilization of underground space development has become trend.Thereupon, particularly outstanding to underground effect on structure by the buoyancy that underground water produces, when underground structure buried depth is big more, the buoyancy that is then produced by underground water is then high more.Groundwater pressure mainly shows the effect of underground structure: the basement bottom board protuberance, and basement leaks up to coal seam floor failure; Inhomogeneous the floating of underground structure integral body can cause the inclination of beam column node place cracking, bottom slab crack and building etc.In order to satisfy the needs of this basic stress balance; The general at present forms such as anti-floating stake technology or increase building counterweight that adopt solve; The use of anti-floating stake in underground structrue engineering wherein is more general, and a kind of as in the pile foundation of anti-floating stake more and more paid attention to by engineering circle at present.Anti-floating power through the anti-floating stake produces is offset the buoyancy that underground water produces underground structure.The anti-floating stake has emerged multiple anti-floating pile body form of structure through the development of decades, from the uniform section bored pile to the stake of prestressing force anti-floating with reducing anti-floating stake or the like.
Requirement to the anti-floating stake mainly concentrates on following 2 points:
(1) the anti-floating power that how to improve the anti-floating stake with reduce construction costs?
Does (2) how the endurance issues of anti-floating pile body solve?
Traditional reinforced concrete pile (comprising bored pile and preformed pile (side's stake and pile tube)); Be the pressure bearing pile type, compressive strength is high, can play good resistance to compression effect; But when using reinforced concrete pile as the anti-floating stake, many weak points of reinforced concrete pile have then been exposed.At first, concrete tensile strength is more much lower than its compressive strength, and tensile strength is merely 1/18 to 1/9 of compressive strength.Pile concrete can produce the crack under stretching action, along with the progressively expansion in crack, concrete is deactivated, and all pulling force is mainly born by reinforcing bar.Because it is underground that the anti-floating stake is in, crack on concrete will inevitably cause that reinforcing bar receives the erosion of water and chemical hazardous substances, thereby has influenced the durability of anti-floating stake; If the width in control crack then need significantly improve its reinforcement ratio, must cause the significantly raising of construction costs; They are two years old; The anti-floating power of anti-floating stake is to provide through the frictional force of pile body with the stake side soil body; Though the reinforced concrete pile pile body has higher-strength; But pile side friction does not improve because of the raising of pile strength, and especially in soft clay area, the pile side friction of deposited reinforced concrete pile is owing to exist slurry coat method then lower.That is to say that steel concrete pile body intensity can not be given full play to, and has caused strength of materials waste, construction costs is improved.
For pile for prestressed pipe and side's stake,, withdrawed from the application of anti-floating stake gradually owing to distress in concrete can be produced in the endurance issues of presstressed reinforcing steel and the work progress though construction costs is lower.
For soil anchor or anchor cable, have the low advantage of construction costs, but, also have the imperfection of construction technology because the crack of grouting body is unreliable to the durability protection of resistance to plucking muscle body, cause in anti-floating stake field, being difficult to promoting.
Based on the present existing problem of anti-floating stake commonly used, engineering circle is badly in need of researching and developing a kind of novel anti-floating stake, and enough anti-floating power can be provided, can solve again the pile body durability and application life problem.
Solve the endurance issues of resistance to plucking muscle body (reinforcing bar or steel strand), must make their the corrosion situation in working environment clear.To this end, we searched the Japan Association of Steel Pipe Piles publication "Steel Hang - Other Design と construction," a book from the book lists a large number of steel pipe piles in the soil corrosion survey results, the following quote data from Japan Ministry of Construction Civil Engineering Institute survey findings:
The respondent is the steel pipe pile of good fortune paddy bridge, and concrete condition is following:
Steel pipe pile external diameter 486mm, wall thickness 16mm, 9mm.
10～November in 1958, construction was extracted after 17 years, carried out the corrosion investigation, and investigation result is as shown in table 1.Visible from table:
(1) the broken parts corrosion of filming in the atmosphere is remarkable; Part corrosion in the topsoil; Local corrosion is arranged except that comprehensive corrosion in the fine sand layer, and local corrosion is more in the mud burning into sand layer; Below clay folder mud, almost there is not corrosion;
(2) the corrosion rate overall average is 0.007mm/ in soil;
(3) position, corrosion rate top layer is obviously greater than the deep layer position; The top layer that coexists, the mud burning into sand is greater than fine sand;
(4) the average 0.024mm/ only in the maximum position of corrosion rate, but the wall thickness corrosion resistant of 2mm 80 years.
Japan's soil property engineering can also be investigated the corrosion situation of steel in soil layer, and the piling bar under the various soil conditions is carried out corrosion test, from 1962 to 1966, is provided with 126 piling bars in 10 places of Japan, and the section of stake is the L type, and stake is about 15m.Then respectively 1 year after setting, respectively extracted 42 in the 5th year, the 10th year, carry out that corrosion situation is observed and the mensuration of thickness of slab reduction, its investigation result is as shown in table 2.
Can make as judging from the investigation result of table 2:
(1) except that matrix section closely, almost maintains the original state through the stake surfaces in 10 years;
(2) various places 10 years overall average corrosion rate (two sides) is 0.0106mm/, and single face is 0.0053mm/, and maximum value is 0.0297mm/;
(3) corrosion rate reduces with year number increase;
(4) recommend design to use corrosion rate to be 0.02mm/.
The steel pipe pile corrosion result of table 1 diverse location
Steel pipe pile corrosion result in the Different Strata of table 2 different regions
In the various decrees in Japanese architecture, building, bay, field such as transform mountains, harness the river, indication, standard, corrosion quantitative limitation and anti-corrosion method all there are concrete regulation, as far as building, in brief:
(1) carries out corrosion test, adopt a year corrosion rate to multiply by 80 years or durable years;
(2) do not test, directly adopt the corrosion amount deposit of 2mm can satisfy life requirement.
Based on above he result of investigation, if consider the corrosion storage level of 3mm can satisfy the life requirement of using more than 100 years for the protection tube of the resistance to plucking muscle body of anti-floating stake.
Summary of the invention
Technical problem to be solved by this invention is; Overcome technical problem and fault of construction that existing uplift pile exists; The construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating stake is provided; The anti-floating stake of being made by this equipment has bigger diameter, and is bigger with the contact surface of the soil body, can obtain higher frictional resistance; The steel protection tube is enclosed within resistance to plucking muscle body in the certain thick steel pipe, and protective action is provided, and guarantees that the reinforcement body can not produce corrosion in the time limit of designing requirement, and having improved in its durability, the stake has joint, construction quality to control easily.Advanced, the anti-floating pile body of the anti-floating pile body construction technology of inventing not influenced by the crack, can significantly reduce construction costs.
In order to solve the existing problem of present uplift pile, technical scheme of the present invention is such:
The construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating stake; Comprise a frame, frame is provided with drilling rod, and the drilling rod upper end is provided with the unit head that drives the drilling rod rotation; The drilling rod lower end has drill bit; The drilling rod lower end is provided with gunniting hole, also is provided with on the frame to be used for bringing resistance to plucking muscle body into pile body inner guide peg in drilling rod sinking process, and frame is provided with and is used to hang fixedly resistance to plucking muscle body and the detachable linkage that discharges resistance to plucking muscle body.
Said resistance to plucking muscle body is with the anticorrosion metal tube, and the lower end of resistance to plucking muscle body is connected with the major part anchor dish that increases uplift resistance.
Said linkage is to be arranged on the hoist engine that is used to lift by crane resistance to plucking muscle body on the frame.
The support of said hoist engine is connected with the support relative fixed of unit head.
Have stirring vane on the drill bit.
Said stirring vane is folding stirring vane.
Perhaps stirring vane is the detachable blade of changing.
On guide peg, be provided with air jet pipe.
Have a resistance to plucking muscle body fastening devices in the lower end of guide peg.
On resistance to plucking muscle body, be provided with and be connected and separable linkage with hoist engine.
Said hoist engine has a branch sleeve, and said resistance to plucking muscle body inserts in the branch sleeve, and has horizontal fastening spiral to be tightened.
Guide peg is provided with the detector that detects the pile body verticality.
Be provided with injected hole on drilling rod top, injected hole is provided with flow detector.
Have a gap between drilling rod and the guide peg, the gap is more than 3mm.
The top of said anticorrosion metal tube is provided with the device that is used for slip casting in pipe.
This construction equipment is reasonable in design, and it is ingenious to construct, and can the resistance to plucking muscle body that have sleeve pipe be inserted in the cement mixing method, and speed of application is fast, reliable in quality.
Anti-floating stake that forms and existing all kinds of anti-floating stakes are more as shown in table 3.Through relatively finding out, anti-floating stake of the present invention not only has higher anti-floating power but also has long durability.Can reach simultaneously the purpose that reduces rolled steel dosage, reduction of erection time, reduction construction costs.
The comparison of table 3 anti-floating stake of the present invention and existing all kinds of anti-floating stakes
Description of drawings
Specify the present invention below in conjunction with the accompanying drawing and the specific embodiment;
Fig. 1 is a kind of novel energy-conserving anti-floating pilework sketch map of the present invention.
Fig. 2 is the structural representation of a kind of novel energy-conserving anti-floating pilework king-pile point of the present invention.
Fig. 3 is the structural representation that the resistance to plucking muscle is connected with base plate in a kind of novel energy-conserving anti-floating pilework of the present invention.
Fig. 4 is an anti-floating pile driving construction device structure sketch map of the present invention.
Fig. 4 a is an anti-floating pile driving construction equipment other direction structural representation of the present invention.
Fig. 5 is drilling rod of the present invention, guide peg, resistance to plucking muscle arrangement sketch map.
Fig. 6 is a blade arrangement structural representation of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1; The pile body structure of this novel anti-floating stake does; Comprise a cement soil pile 3, be provided with resistance to plucking muscle body 4 in the pile body and link together that resistance to plucking muscle body 4 links to each other with structure base plate 6 with stake point 1, anchor ingot plate 2 and protecting tube 5; The anti-floating power that the anti-floating stake is provided is delivered on the structure base plate, realizes the anti-floating of underground structure.
Referring to Fig. 2; This novel anti-floating pile body structure is to comprise a rotary jet stirring pile body or by the pile body 3 that cementation forms, bury resistance to plucking muscle body 4 in the pile body 3 underground; Resistance to plucking muscle body 4 and stake point 1 link to each other with a plurality of anchor ingot plates 2, and resistance to plucking muscle body 4 is enclosed within one and protects in the steel pipe 5.
After increasing protection steel pipe 5, steel pipe 5 forms a shielding construction, and when corrosion takes place, then preferential corrosion protection steel pipe 5, protection steel pipe 5 thickness are confirmed by the engineering actual conditions, like age of project, bad border of corrosion etc.Effectively protected inner resistance to plucking muscle body 4 not to be corroded.
Referring to Fig. 3; Resistance to plucking muscle body 4 in this novel anti-floating pile body extend in the structure base plate 6 with protecting tube 5; Use ground tackle 7 and backing plate 10; Realize the sealing of protecting tube 5 in structure base plate 6 and the preparatory stretch-draw of resistance to plucking muscle body 4, and the ground tackle 7 resistance to plucking muscle body 4 that adds is outward linked to each other with reinforcing bar 9 usefulness special mould clamps 8 in the structure base plate.
After forming this pile body 3,, adopt specialist tools, be sent in the pile body along the center of this pile body and go resistance to plucking muscle body 4 and anchor ingot plate 2, protecting tube 5, insert put in place after, and rotary jet grouting in pile body again.
Resistance to plucking muscle body 4 is one or more steel strand, reinforcing bar, wire rope etc.
Anchor ingot plate 2 is to be processed from strand by High-strength plate, is hollow disc shape or hollow polygon.
Anti-floating pilework in the present embodiment is that substep is executed and do to be accomplished, and both can in comparatively hard soil layer, form, and also can in the soil layer of weakness such as mucky soil, quicksand and slity soil, form, and this anti-floating stake can obtain higher anti-floating power behind the maintenance certain hour.
Referring to Fig. 4 and Fig. 4 a; The construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating stake; Comprise a frame 11, frame 11 is provided with drilling rod 12, and drilling rod 12 upper ends are provided with the unit head that drives the drilling rod rotation; Drilling rod 12 lower ends have drill bit 13; Drilling rod 12 lower ends are provided with gunniting hole, also are provided with on the frame to be used for bringing resistance to plucking muscle body into pile body inner guide peg 15 in drilling rod sinking process, and frame is provided with and is used to hang fixedly resistance to plucking muscle body and the detachable linkage that discharges resistance to plucking muscle body.
Said resistance to plucking muscle body is with the anticorrosion metal tube, and the lower end of resistance to plucking muscle body is connected with the major part anchor dish that increases uplift resistance.
Said linkage is to be arranged on the hoist engine 16 that is used to lift by crane resistance to plucking muscle body on the frame.It should be noted that hoist engine and unit head need synchronization lifting.Referring to Fig. 5, hoist engine 16 is fixedly installed on the unit head frame lower, with the first lifting of power; Arrangement is that left side is a drilling rod 12, and the centre is a guide peg 15, and what right edge was sling is resistance to plucking muscle body 4; Certainly carry out other arrangement as required, do not enumerate one by one at this.
The support of said hoist engine 16 is connected with the support relative fixed of unit head.
Have stirring vane 14 on the drill bit 13.Said stirring vane is that folding stirring vane or stirring vane are the detachable blade of changing size.Referring to Fig. 6, blade 14 can the symmetry be arranged on the drill bit, also can carry out asymmetric separation (not shown).
The lower end of guide peg has a resistance to plucking muscle body fastening devices 151.
Resistance to plucking muscle body upper end is provided with hoist engine and is connected and separable linkage.
Said hoist engine 16 has a branch sleeve 161, and said resistance to plucking muscle body inserts in the branch sleeve, and has horizontal fastening spiral to be tightened.
Guide peg is provided with the detector that detects the pile body verticality.
More than the spacing 3mm between drilling rod 12 and the guide peg 15.
The top of said anticorrosion metal tube is provided with the device that is used for slip casting in pipe.
Its job practices is following:
A) at first drilling rod sinks to creeping into, and forms cement soil pile, extracts drilling rod;
B) in follow-up drilling rod sinking drilling process, the resistance to plucking muscle that insertion has the anticorrosion metal tube in cement soil pile is to assigned address;
C) extract drilling rod at last, the resistance to plucking muscle that will have the anticorrosion metal tube is stayed in the cement soil pile.
Further, in a) step drilling rod sinking drilling process, whitewashing can certainly not whitewashed while creeping into.
Further,, in the drilling rod withdrawal process, whitewash simultaneously, can certainly not whitewash in a) step.
Further; In a) step, form cement soil pile after, drilling rod is extracted; The resistance to plucking muscle that will have the anticorrosion metal tube simultaneously is connected on the hoist engine and lifts by crane; When Kelly Stubb to resistance to plucking muscle body is sling fully, will have the resistance to plucking muscle body and the guide peg relative fixed of anticorrosion metal tube again, carry out b again) step.
Fixedly during the resistance to plucking muscle, the fastening devices of guide peg lower end is stuck on the resistance to plucking muscle, makes that the guide peg band the resistance to plucking muscle and got into together in the pile body when sinking to creeping into, when guide peg was extracted, fastening devices can be thrown off from resistance to plucking muscle body.
Carrying out b) before the step, the blade dimensions on the adjustment drilling rod makes blade stirring scope reduce, and moves drilling rod again and makes resistance to plucking muscle body aim at the pile body center, sink to creeping into.With can solving the eccentricity issues that the resistance to plucking muscle is put forward after the translation of resistance to plucking muscle body, the adjustment blade makes and stirs diameter and reduce the soil body outside the not disturbance pile body then, in order to avoid influence quality.
Carrying out b) in the step process, rotary jet grouting is carried out in the drilling rod counter-rotating simultaneously.Repeatedly whitewashing makes not produce the space in the pile body that pile quality is reliable.
Said b) step after the completion of resistance to plucking muscle insertion pile body, is separated resistance to plucking muscle body with hoist engine, carry out c again) step, withdraw from drilling rod.Resistance to plucking muscle body will be stayed in the pile body separately.
At c) in the step, when drilling rod is extracted, continue whitewashing, drilling rod stops operating simultaneously.
On the wall of anticorrosion metal tube, carry out perforate, opening diameter is 2-15mm, perforate be spaced apart 0.5-10m.Carry out perforate and can prevent in the joint bar process, produce vacuum in the anticorrosion metal tube, be difficult for inserting, gas or the cement paste anticorrosion metal tube of can freely coming in and going out can not produce and vacuumize phenomenon in the pipe after the perforate.
Guide peg sinks or carries out when extracting jet.Carry out jet can promoting flowing of cement paste, make it more even.
In the sinking drilling process, detect drilling rod and guide peg verticality with verticality detector, if exceed the inclination of error range, then be adjusted in the error range of permission.Reason adjustment mode according to different has: extract once more and creep into, adjust frame level etc., as underground obstruction arranged, remove, vertically bore down to guarantee drilling rod.
The job practices of another this anti-floating stake is following in addition:
A) at first resistance to plucking muscle body is sling and be fixedly connected with guide peg, drilling rod sinks to creeping into then, forms cement soil pile;
B) when forming cement earth pile, the resistance to plucking muscle that will have the anticorrosion metal tube stays to be brought in the cement soil pile;
C) extract drilling rod at last, the resistance to plucking muscle that will have the anticorrosion metal tube is stayed in the cement soil pile.
Said method sinks to creeping into or b at a) step drilling rod) step extracts in the process of drilling rod whitewashing simultaneously.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the manual just explains principle of the present invention; The present invention also has various changes and modifications under the prerequisite that does not break away from spirit and scope of the invention, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (15)
1. the construction equipment of energy-saving pressure distributing cement-soil anti-floating stake is characterized in that, comprises a frame; Frame is provided with drilling rod; The drilling rod upper end is provided with the unit head that drives the drilling rod rotation, and the drilling rod lower end has drill bit, and the drilling rod lower end is provided with gunniting hole; Also be provided with on the frame and be used for bringing resistance to plucking muscle body into pile body inner guide peg in drilling rod sinking process, frame is provided with the linkage that is used to hang fixing resistance to plucking muscle body and detachable release resistance to plucking muscle body.
2. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 1 stake is characterized in that said resistance to plucking muscle body is with the anticorrosion metal tube, and the lower end of resistance to plucking muscle body is connected with the major part anchor dish that increases uplift resistance.
3. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 1 stake is characterized in that said linkage is to be arranged on the hoist engine that is used to lift by crane resistance to plucking muscle body on the frame.
4. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that the support of said hoist engine is connected with the support relative fixed of unit head.
5. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 1 stake is characterized in that, has stirring vane on the drill bit.
6. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 5 stake is characterized in that said stirring vane is folding stirring vane.
7. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 5 stake is characterized in that, stirring vane is the detachable blade of changing.
8. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 1 stake is characterized in that guide peg is provided with air jet pipe.
9. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 1 stake is characterized in that, the lower end of guide peg has a resistance to plucking muscle body fastening devices.
10. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that, resistance to plucking muscle body upper end is provided with hoist engine and is connected and separable linkage.
11. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that said hoist engine has a branch sleeve, said resistance to plucking muscle body inserts in the branch sleeve, and has horizontal fastening spiral to be tightened.
12. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that, guide peg is provided with the detector that detects the pile body verticality.
13. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that drilling rod top is provided with injected hole, injected hole is provided with flow detector.
14. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 3 stake is characterized in that having the gap between drilling rod and the guide peg.
15. the construction equipment of a kind of energy-saving pressure distributing cement-soil anti-floating according to claim 2 stake is characterized in that, the top of said anticorrosion metal tube is provided with the device that is used for slip casting in pipe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831717A (en) * | 2015-06-05 | 2015-08-12 | 刘玉秋 | Trapezoidal mixed soil pile machine |
| CN110307657A (en) * | 2019-07-10 | 2019-10-08 | 台州长天能源技术有限公司 | Soil stores up cold-heating system heat preserving method facility |
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| JP2001193060A (en) * | 2000-01-12 | 2001-07-17 | Hitachi Constr Mach Co Ltd | Soil cement pile forming machine |
| CN201050063Y (en) * | 2007-04-12 | 2008-04-23 | 武汉市天宝工程机械有限责任公司 | Multifunctional pile machine |
| CN101603310A (en) * | 2009-07-03 | 2009-12-16 | 广东永基建筑基础有限公司 | Stirring pile-grafting machine |
| CN202280053U (en) * | 2011-10-31 | 2012-06-20 | 上海强劲地基工程股份有限公司 | Construction equipment of energy-saving pressure distributive cemented soil anti-floating pile |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001193060A (en) * | 2000-01-12 | 2001-07-17 | Hitachi Constr Mach Co Ltd | Soil cement pile forming machine |
| CN201050063Y (en) * | 2007-04-12 | 2008-04-23 | 武汉市天宝工程机械有限责任公司 | Multifunctional pile machine |
| CN101603310A (en) * | 2009-07-03 | 2009-12-16 | 广东永基建筑基础有限公司 | Stirring pile-grafting machine |
| CN202280053U (en) * | 2011-10-31 | 2012-06-20 | 上海强劲地基工程股份有限公司 | Construction equipment of energy-saving pressure distributive cemented soil anti-floating pile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831717A (en) * | 2015-06-05 | 2015-08-12 | 刘玉秋 | Trapezoidal mixed soil pile machine |
| CN110307657A (en) * | 2019-07-10 | 2019-10-08 | 台州长天能源技术有限公司 | Soil stores up cold-heating system heat preserving method facility |
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| CN102359105B (en) | 2014-07-16 |
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