CN104563090A - Control method for increasing air pressure intensity in pile sleeve of sand pile through extrusion - Google Patents
Control method for increasing air pressure intensity in pile sleeve of sand pile through extrusion Download PDFInfo
- Publication number
- CN104563090A CN104563090A CN201310509052.7A CN201310509052A CN104563090A CN 104563090 A CN104563090 A CN 104563090A CN 201310509052 A CN201310509052 A CN 201310509052A CN 104563090 A CN104563090 A CN 104563090A
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- pipe casing
- sand
- atmospheric pressure
- pile
- control system
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Links
- 239000004576 sand Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001125 extrusion Methods 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000005056 compaction Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000011664 signaling Effects 0.000 description 2
- 241000282693 Cercopithecidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
- E02D2250/0084—Production methods for working underwater using pneumatical means
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a control method for increasing the air pressure intensity in a pile sleeve of a sand pile through extrusion. The method comprises the following contents that an air pressure intensity sensor arranged in the pile sleeve is connected with an electric control system, a pneumatic pressurizing valve and a pneumatic pressure reducing valve are also connected with the electric control system, the inside and outside pressure balance principle of the pile sleeve is used, and the air pressure intensity target value in the pile sleeve is calculated through the position of the bottom of the pile sleeve relative to a water layer and a mud layer and the length of a sand post in the pile sleeve; the electric control system determines the opening and the closing of the pneumatic pressurizing valve and the pneumatic pressure reducing valve according to the deviation between the measuring value of the air pressure intensity sensor and the air intensity target value in the pipe sleeve, so that the measuring value of the pressure intensity sensor always maintains the air pressure intensity target value in the pile sleeve. The control method has the advantages that the opening and the closing of the pneumatic pressuring value and the pneumatic pressure reducing valve are controlled through the electric control system, the automation degree is high, the construction precision is high, a great amount of manual operation control is avoided, and the labor resources are saved.
Description
Technical field
The present invention relates to underwater sand compaction pile foundation consolidating technology field, particularly relate to the control method of atmospheric pressure in a kind of sand compaction pile pipe casing.
Background technology
Underwater sand compaction pile foundation consolidating technology by vibration sinking tube equipment and tube chamber water booster system, sand is forced to be pressed under water in soft foundation on special sand pile ship, through vibration pipe-drawing, return, compacted expanding, form sand compaction pile.By displacement, compacted, the drainage of sand compaction pile, increase foundation strength and rigidity, accelerate ground consolidation, reduce works sedimentation, improve the Anti-liquefying asility of ground.
The construction of sand compaction pile comprises following several stages:
1, the pipe casing injection water layer stage: the water column in pipe casing is all discharged by this demands, now require that inner air tube pressure is enough to discharge water column in pipe, also to prevent from destroying the mud layer below water layer simultaneously, therefore the external water pressure that inner air tube pressure should remain on slightly larger than pipe casing bottom position is strong, stop lower stake during distance mud face certain altitude and continue pressurization, preventing pipe compressed air from going out from end and destroying ground.
2, pipe casing is conducted oneself with dignity the sinking stage in mud layer: this demands inner air tube pressure will prevent mud face to be punched into the inside of pipe casing, and the excessive compressed air that causes of atmospheric pressure also will be prevented by going out destruction ground in pipe casing simultaneously.
3, the vibration-sunk stage of pipe casing in mud layer: along with pipe casing deepening continuously in mud layer, pipe casing cannot utilize deadweight to continue to sink, now, open stake under vibrating hammer, this demands inner air tube pressure answers mud post in control valve to have certain height.
4, in the pipe casing end portion treatment stage: by the specific position of stake under pipe casing, start to carry out end portion treatment to pipe casing, upwards slow tube drawing, is discharged the mud post in pipe by the atmospheric pressure in pipe.In end portion treatment process, inner air tube pressure controls in certain value, can discharge mud post in pipe casing efficiently for principle.
5, the pile stage (see Fig. 1):
A, vibration sleeve pipe are to predetermined absolute altitude: after lower stake to predetermined absolute altitude, sand is added pipe casing 1, by being installed on the vibration of the pile monkey of pipe casing 1 topmost, make the sand in pipe casing 1 closely knit, the metering of the tonnage meter of the below setting of the pulley block mechanism pulling pipe casing is counted and is installed on according to the sand face being installed on pipe casing 1, determine in pipe casing 1 whether be sand post entirely, if have part mud post or water column to exist, again end portion treatment is carried out at predetermined n ear, ensure that in pipe casing be all sand post, and then beat to predetermined absolute altitude.
B, tube drawing: after pipe casing 1 is sink to predetermined absolute altitude, increase atmospheric pressure in pipe casing 1, sand post in pipe casing 1 is discharged, with certain speed upwards tube drawing, in pipe casing 1, sand column length evenly reduces, formed below pipe casing with tube drawing height be height, the sand post of diameter that meets design requirement.The height pulled out on each is determined according to pipe casing diameter, sand pile diameter and each circulation pile height.In this stage pipe casing 1, atmospheric pressure can regulate along with sleeve pipe pulls out drain sleeve with sand post in pipe casing 1.
C, to return: after tube drawing terminates, return.Returning in process, atmospheric pressure in pipe casing 1 kept, guaranteeing to return the interior sand column length of pipe in process constant.Should prevent from crossing ambassador's sand post due to atmospheric pressure to gush out in pipe casing 1 in a large number, prevent atmospheric pressure from crossing tubule foreign object again and pour in pipe.
Repeat tube drawing, return process, namely form sand compaction pile.Constantly formed in the process of expanding sand compaction pile at this, along with pile pipe constantly upwards, the atmospheric pressure in pipe will reduce thereupon gradually.
Prior art is first carry out theory calculate according to the Specific construction of sand compaction pile to the control of atmospheric pressure in pipe casing 1, draw the air pressure intensity values of variant construction stage, then in each construction stage, set out corresponding air pressure intensity values by hand, carried out the construction of every one-phase.Prior art realizes especially by following methods the control of atmospheric pressure in pipe casing: in pipe casing 1, arrange atmospheric pressure sensor, the gas circuit that pipe casing 1 and air compressor machine, gasholder are formed arranges the Pneumatic Pressure valve and pneumatic pressure-release valve that control atmospheric pressure in pipe casing, in each construction stage, first correspondingly Pneumatic Pressure valve or pneumatic pressure-release valve is regulated, in manual setting pipe casing, atmospheric pressure is theory calculate setting value out, and then constructs.In such pipe casing, atmospheric pressure control method automaticity is low, lost labor, and construction precision is low, and air pressure intensity values is not often bigger than normal is exactly less than normal, thus causes various drawback.
Summary of the invention
The shortcoming of prior art in view of the above, the technical problem to be solved in the present invention is to provide the control method that a kind of automaticity is high, save atmospheric pressure in the high sand compaction pile pipe casing of manpower, construction precision, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, the control method of atmospheric pressure in a kind of sand compaction pile pipe casing provided by the invention, comprises following content:
One, measure the depth of water of construction location, obtain by the end absolute altitude that buries of design sand pile the depth capacity that pipe casing enters soil layer, determine predetermined absolute altitude; Two, utilize the principle of pipe casing internal and external pressure balance, to draw bottom the desired value of the adjustment of atmospheric pressure in pipe casing and pipe casing relative to the conversion relation between the length of sand post in the position of the position of water, mud layer, pipe casing:
The desired value of getting the adjustment of atmospheric pressure in pipe casing is P1, is x lower than the distance of the water surface bottom pipe casing, and be y lower than the distance in mud face bottom pipe casing, the length of sand post is z, and the depth of water is H
4, the depth capacity that pipe casing enters soil layer is H
2, γ is sand post unit weight, γ
1for water capacity weight, γ
2for native buoyant unit weight, the security control reduction coefficient of sand post is ξ, then
When pipe casing enters the stage in water: P
1=γ
1x; Here 0≤x≤H
4;
Pipe casing sinks the stage in mud layer: P
1=γ
1h
4+ γ
2y; Here 0≤y≤H
2;
The stage of pipe casing in pile pulling process under mud face: P
1=γ
1h
4+ γ
2y-ξ γ z; Here 0≤y≤H
2;
The stage of pipe casing in pile pulling process on underwater, mud face: P
1=γ
1x-ξ γ z; Here 0≤x≤H
4;
Three, the atmospheric pressure sensor in pipe casing is connected with electrical control system, Pneumatic Pressure valve, pneumatic pressure-release valve are also connected with electrical control system, the difference of the desired value that electrical control system is adjusted according to atmospheric pressure in the measured value of atmospheric pressure sensor and pipe casing controls the opening and closing of Pneumatic Pressure valve and pneumatic pressure-release valve.
Preferably, the security control reduction coefficient ξ of described sand post gets 0.7-0.8.
In order to the length signals making electrical control system obtain sand post, a sand face meter is provided with in described pipe casing, described sand face meter is connected with described electrical control system, and the metering signal that described sand face is counted is converted into the length signals of described sand post by described electrical control system.
In order to make the positional information relative to the water surface, mud face bottom electrical control system acquisition pipe casing, described pipe casing is provided with one for detecting the sand pipe detector of bottom relative to the position of water layer, mud layer of pipe casing, described sand pipe detector is connected with described electrical control system, and the metering signal of described sand pipe detector is converted into the position signalling of bottom relative to water layer, mud layer of described pipe casing by described electrical control system.
As mentioned above, the control method of atmospheric pressure in sand compaction pile pipe casing of the present invention, has following beneficial effect:
By the design of electrical control system control program, sand face is counted, sand pipe detector provides the length of sand post in pipe casing for electrical control system, relative to the water surface bottom pipe casing, the positional information in mud face, electrical control system correspondingly provides the desired value of atmospheric pressure adjustment in pipe casing, by the atmospheric pressure sensor in pipe casing for electrical control system provides real-time atmospheric pressure information, the difference of the desired value that electrical control system adjusts according to atmospheric pressure and actual air pressure values adjusts described Pneumatic Pressure valve, the open and close of pneumatic pressure-release valve, thus in time the atmospheric pressure in pipe casing is adjusted to the best.Automaticity of the present invention is high, and construction precision is high, avoids a large amount of manual operations and controls, save manpower.
Accompanying drawing explanation
Fig. 1 is shown as the process schematic representation in sand compaction pile pipe casing pile stage.
Element numbers explanation
1 pipe casing
H
2pipe casing enters the depth capacity of soil layer
H
4the depth of water
Detailed description of the invention
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this manual can understand other advantages of the present invention and effect easily.
Refer to Fig. 1.Notice, structure, ratio, size etc. that this manual institute accompanying drawings illustrates, content all only in order to coordinate manual to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this manual as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 1, the control method of atmospheric pressure in a kind of sand compaction pile pipe casing provided by the invention, comprises following content:
One, measure the depth of water of construction location, obtain by the end absolute altitude that buries of design sand pile the depth capacity that pipe casing enters soil layer, determine predetermined absolute altitude;
Two, utilize the principle of pipe casing 1 internal and external pressure balance, to draw bottom the desired value of the adjustment of atmospheric pressure in pipe casing and pipe casing 1 relative to the conversion relation between the length of sand post in the position of the position of water, mud layer, pipe casing 1:
The desired value of getting the adjustment of atmospheric pressure in pipe casing is P1, is x lower than the distance of the water surface bottom pipe casing 1, and be y lower than the distance in mud face bottom pipe casing 1, the length of sand post is z, and the depth of water is H
4, the depth capacity that pipe casing enters soil layer is H
2, γ is sand post unit weight, γ
1for water capacity weight, γ
2for native buoyant unit weight, the security control reduction coefficient of sand post is ξ, then
When pipe casing 1 enters the stage in water: P
1=γ
1x; Here 0≤x≤H
4;
Pipe casing 1 sinks the stage in mud layer: P
1=γ
1h
4+ γ
2y; Here 0≤y≤H
2;
The stage of pipe casing 1 in pile pulling process under mud face: P
1=γ
1h
4+ γ
2y-ξ γ z; Here 0≤y≤H
2;
The stage of pipe casing 1 in pile pulling process on underwater, mud face: P
1=γ
1x-ξ γ z; Here 0≤x≤H
4;
Three, the atmospheric pressure sensor in pipe casing 1 is connected with electrical control system, Pneumatic Pressure valve, pneumatic pressure-release valve are also connected with electrical control system, the difference of the desired value that electrical control system is adjusted according to atmospheric pressure in the measured value of atmospheric pressure sensor and pipe casing controls the opening and closing of Pneumatic Pressure valve and pneumatic pressure-release valve.
In order to the length signals making electrical control system obtain sand post, a sand face meter is provided with in described pipe casing 1, described sand face meter is connected with described electrical control system, and the metering signal that described sand face is counted is converted into the length signals of described sand post by described electrical control system.
In order to make the positional information relative to the water surface, mud face bottom electrical control system acquisition pipe casing 1, described pipe casing 1 is provided with one for detecting the sand pipe detector of bottom relative to the position of water, mud layer of pipe casing 1, described sand pipe detector is connected with described electrical control system, and the metering signal of described sand pipe detector is converted into the position signalling of bottom relative to water, mud layer of described pipe casing 1 by described electrical control system.
According to the traditional habit of China, for the ease of commercially buying the various pressure elements that the present invention uses, the pressure unit arrived involved in the present invention is unified is preferably kgf/cm
2.
According to practical construction experience, the security control reduction coefficient of described sand post is that ξ generally gets 0.7-0.8.
Then, the present invention is realized by following content for the control of atmospheric pressure in sand compaction pile pipe casing:
The desired value P that the signal being supplied to electrical control system draws atmospheric pressure adjustment in pipe casing 1 is counted by sand pipe detector and sand face
1, record air pressure intensity values actual in pipe casing 1, if the air pressure intensity values of reality is greater than P by atmospheric pressure sensor
1, then pneumatic pressure-release valve is opened until the show value of atmospheric pressure sensor is P
1; If the air pressure intensity values of reality is less than P
1, then Pneumatic Pressure valve is opened until the show value of atmospheric pressure sensor is P
1.Thus make the atmospheric pressure in pipe casing 1 remain the desired value of the atmospheric pressure adjustment of needs.
In sum, in sand compaction pile pipe casing 1 of the present invention, the control method of atmospheric pressure passes through the design of electrical control system control program, sand face is counted, sand pipe detector provides the length of sand post in pipe casing 1 for electrical control system, relative to water bottom pipe casing 1, the positional information in mud face, electrical control system correspondingly provides the desired value of atmospheric pressure adjustment in pipe casing 1, by the atmospheric pressure sensor in pipe casing 1 for electrical control system provides real-time atmospheric pressure information, the difference of the desired value that electrical control system adjusts according to required atmospheric pressure and actual air pressure values adjusts described Pneumatic Pressure valve, the open and close of pneumatic pressure-release valve, thus in time the atmospheric pressure in pipe casing 1 is adjusted to the best.Automaticity of the present invention is high, and construction precision is high, avoids a large amount of manual operations and controls, save manpower.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (4)
1. the control method of atmospheric pressure in sand compaction pile pipe casing, is characterized in that, comprise following content:
One, measure the depth of water of construction location, obtain by the end absolute altitude that buries of design sand pile the depth capacity that pipe casing enters soil layer, determine predetermined absolute altitude;
Two, utilize the principle of pipe casing internal and external pressure balance, to draw bottom the desired value of the adjustment of atmospheric pressure in pipe casing and pipe casing relative to the conversion relation between the length of sand post in the position of the position of water, mud layer, pipe casing:
The desired value of getting the adjustment of atmospheric pressure in pipe casing is P1, is x lower than the distance of the water surface bottom pipe casing, and be y lower than the distance in mud face bottom pipe casing, the length of sand post is z, and the depth of water is H
4, the depth capacity that pipe casing enters soil layer is H
2, γ is sand post unit weight, γ
1for water capacity weight, γ
2for native buoyant unit weight, the security control reduction coefficient of sand post is ξ, then
When pipe casing enters the stage in water: P
1=γ
1x; Here 0≤x≤H
4;
Pipe casing sinks the stage in mud layer: P
1=γ
1h
4+ γ
2y; Here 0≤y≤H
2;
The stage of pipe casing in pile pulling process under mud face: P
1=γ
1h
4+ γ
2y-ξ γ z; Here 0≤y≤H
2;
The stage of pipe casing in pile pulling process on underwater, mud face: P
1=γ
1x-ξ γ z; Here 0≤x≤H
4;
Three, the atmospheric pressure sensor in pipe casing is connected with electrical control system, Pneumatic Pressure valve, pneumatic pressure-release valve are also connected with electrical control system, the difference of the desired value that electrical control system is adjusted according to atmospheric pressure in the measured value of atmospheric pressure sensor and pipe casing controls the opening and closing of Pneumatic Pressure valve and pneumatic pressure-release valve.
2. the control method of atmospheric pressure in sand compaction pile pipe casing according to claim 1, is characterized in that: the security control reduction coefficient ξ of described sand post gets 0.7-0.8.
3. the control method of atmospheric pressure in sand compaction pile pipe casing according to claim 1, is characterized in that: be provided with a sand face meter in described pipe casing, and described sand face meter is connected with described electrical control system.
4. the control method of atmospheric pressure in sand compaction pile pipe casing according to claim 1, it is characterized in that: described pipe casing is provided with one for detecting the sand pipe detector of bottom relative to the position of water layer, mud layer of pipe casing, described sand pipe detector is connected with described electrical control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310509052.7A CN104563090B (en) | 2013-10-24 | 2013-10-24 | The control method of atmospheric pressure in sand compaction pile pipe casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310509052.7A CN104563090B (en) | 2013-10-24 | 2013-10-24 | The control method of atmospheric pressure in sand compaction pile pipe casing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104563090A true CN104563090A (en) | 2015-04-29 |
| CN104563090B CN104563090B (en) | 2016-06-22 |
Family
ID=53080103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310509052.7A Active CN104563090B (en) | 2013-10-24 | 2013-10-24 | The control method of atmospheric pressure in sand compaction pile pipe casing |
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| Country | Link |
|---|---|
| CN (1) | CN104563090B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761706A (en) * | 2017-09-28 | 2018-03-06 | 开普天（上海）岩土科技有限公司 | Sand pile former and method |
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| CN1570287A (en) * | 2003-07-17 | 2005-01-26 | 北京振冲工程股份有限公司 | Vibration immersed tube stone breaking pile air blast method construction process and apparatus therefor |
| JP4332569B2 (en) * | 2006-04-21 | 2009-09-16 | 新日本製鐵株式会社 | Material for sand compaction pile construction method and construction method of sand compaction pile using the material |
| CN102071673A (en) * | 2011-01-12 | 2011-05-25 | 中铁港航工程局有限公司 | Underwater construction method for gravel pile |
| CN102296588A (en) * | 2011-05-27 | 2011-12-28 | 中交第三航务工程局有限公司 | Construction process of underwater sand compaction pile |
| CN104018486A (en) * | 2014-06-06 | 2014-09-03 | 中交上海三航科学研究院有限公司 | Drivability analysis method for compaction sand pile forming process |
-
2013
- 2013-10-24 CN CN201310509052.7A patent/CN104563090B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1570287A (en) * | 2003-07-17 | 2005-01-26 | 北京振冲工程股份有限公司 | Vibration immersed tube stone breaking pile air blast method construction process and apparatus therefor |
| JP4332569B2 (en) * | 2006-04-21 | 2009-09-16 | 新日本製鐵株式会社 | Material for sand compaction pile construction method and construction method of sand compaction pile using the material |
| CN102071673A (en) * | 2011-01-12 | 2011-05-25 | 中铁港航工程局有限公司 | Underwater construction method for gravel pile |
| CN102296588A (en) * | 2011-05-27 | 2011-12-28 | 中交第三航务工程局有限公司 | Construction process of underwater sand compaction pile |
| CN104018486A (en) * | 2014-06-06 | 2014-09-03 | 中交上海三航科学研究院有限公司 | Drivability analysis method for compaction sand pile forming process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107761706A (en) * | 2017-09-28 | 2018-03-06 | 开普天（上海）岩土科技有限公司 | Sand pile former and method |
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| Publication number | Publication date |
|---|---|
| CN104563090B (en) | 2016-06-22 |
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