CN101054799A - Post-grouting construction method for long helical bore grouting pile and its grouting device - Google Patents
Post-grouting construction method for long helical bore grouting pile and its grouting device Download PDFInfo
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- CN101054799A CN101054799A CN 200710200046 CN200710200046A CN101054799A CN 101054799 A CN101054799 A CN 101054799A CN 200710200046 CN200710200046 CN 200710200046 CN 200710200046 A CN200710200046 A CN 200710200046A CN 101054799 A CN101054799 A CN 101054799A
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Abstract
A long auger hole grouted pile post-grouting processing method and the postposition grouting device, which has the following step: firstly, the postposition grouting device is made; then, the long earth auger is used to drill; the plain concrete is pumped into the hole of the pile; after pouring the concrete on the pile stem, the grouting device is hung up and disposed above the pile stem before the cement is initially set; the hammer of the grouting device is started, and the postposition grouting device is immersed into the pile stem to the design elevation under the action of the exciting force and the leading of the guide member; the hammer is vibrating while being lifted and the hammer is drawn, then the hammer is closed, to set the postposition grouting device in the pile stem; after the pile stem concrete pouring is completed and the cement is finally set, the grouting is processed by the pile toe grouting pipe and the pile side grouting pipe, to make the soil mass in some distance around the pile toe and the pile cycle being reinforced. The invention greatly advances the bearing capacity of pile, reduces the engineering quality hidden danger of the long auger hole grouted pile and the amount of pile compared with the traditional technology, lowers the basic engineering invest.
Description
(1), technical field
The present invention relates to a kind of construction project pile foundation and handle job practices and grouting device thereof.
(2), background technology
Long auger is pressed and irritated stake is the pile foundation construction new technology that development in recent years is got up, its job practices is to hole with long-spiral drilling machine earlier, pile of pumping of concrete in the hole then, pore-forming perfusion is accomplished without any letup, and has that construction is convenient, a mud-less pollution, noise is little, efficient is high, cost is low characteristics.But because stake is held, there is loosened soil in a stake side regular meeting; the supporting capacity that causes long auger pressure filling stake reduces; therefore; further reduce pile foundation settlement; the investment of saving pile foundation engineering; guaranteeing the stable performance of pile bearing capacity, enlarge the range of application of this type, is that scientific and technical personnel press the filling stake to be badly in need of a technical barrier that solves to auger boring.
(3), summary of the invention
The purpose of this invention is to provide a kind of long auger and press filling stake grouting behind shaft or drift lining to handle a job practices and a rearmounted grouting device thereof, solve the problem of solidifying an end, stake side loosened soil, improving bearing capacity of single pile; Also solve and further improve the problem that long auger is pressed filling stake quality of pile stability, increased foundation stiffness.Reach and save cost, reduce foundation settlement, guarantee the purpose of workmanship.
Technical scheme of the present invention: it is that construction sequence is as follows that this long auger is pressed the feature of irritating stake grouting behind shaft or drift lining processing job practices:
Step 1: make rearmounted grouting device, this device comprises pile grouting pipe, stake side Grouting Pipe, spacer bars circle, the reinforcing bar of revealing all the details, vibrating hammer and is connected the ways of vibrating hammer lower end, when in the stake reinforcing cage being set, this postposition grouting device and reinforcing cage link into an integrated entity;
Step 2: hole with long-spiral drilling machine;
Step 3: pumping plain concrete in the stake hole, concrete slump 180～220mm;
Step 4: before pile concrete is built the cement initial set that finishes, above-mentioned grouting device is sling, and placed on the pile body;
Step 5: start the vibrating hammer of grouting device,, the grouting behind shaft or drift lining device is sunk in the pile body to design elevation under the exciting force effect and under the guiding of ways;
Step 6: mention vibrating hammer while vibrating and extract ways, close vibrating hammer then, the grouting behind shaft or drift lining device is stayed in the pile body;
Step 7: after treating that pile concrete is built the cement final set that finishes, carry out slip casting by pile grouting pipe, stake side Grouting Pipe, injection slurry is gone out from the slip casting one way valve of pile grouting pipe and stake side Grouting Pipe, near the soil body an injection stake end, the stake side;
Near step 8: form reinforcing area the stake end, the stake side.
In step 3, strength grade of concrete is C20～C50.
In step 7, injection slurry adopts cement paste, water/binder ratio 0.4～1.0, grouting pressure 0.6～12MPa.
In step 7, before slip casting, annotate earlier clear water, make the slip casting passage unobstructed after slip casting again.
Above-mentioned long auger is pressed and is irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, it is characterized in that: the spacer bars circle that this device comprises Grouting Pipe at the bottom of at least two piles that place pile body ring week, at least one pile side Grouting Pipe, fixedly connected with stake side Grouting Pipe with the pile grouting pipe, be connected in the reinforcing bar of revealing all the details, the vibrating hammer of pile grouting pipe lower end and be connected in ways bottom the vibrating hammer; At the bottom of pile grouting pipe lower end connected the pile grouting one way valve and extends, the lower end of stake side Grouting Pipe connected annular slip casting one way valve and places a side.
The spacing of above-mentioned spacer bars circle and neighbouring spacer bars circle can be 1-3 rice.
Above-mentioned pile grouting pipe can be connected with the colligation of spacer bars circle or weld with stake side Grouting Pipe.
Above-mentioned pile grouting pipe and stake side Grouting Pipe can link into an integrated entity with reinforcing cage, and the vertical muscle of pile grouting pipe, stake side Grouting Pipe and reinforcing cage is positioned on the same circumference, and the reinforcing cage spiral stirrup is looped around above-mentioned three's periphery.
The above-mentioned reinforcing bar of revealing all the details can be that the upper end with two above V-arrangements or U-shaped reinforcing bar welds on superincumbent spacer bars circle and the pile grouting steel pipe, and the stage casing of above-mentioned V-arrangement or U-shaped reinforcing bar is welded on the taper pocketed thing that forms on following spacer bars circle and the pile grouting steel pipe.
The above-mentioned reinforcing bar of revealing all the details also can be to utilize the vertical muscle lower end of the reinforcing cage that is distributed in the reinforcing cage circumference to the crooked taper pocketed thing that draws in and weld in the center of circle.
The present invention holes earlier, the concrete perfusion pile, installs rearmounted grouting device then, treats that pile concrete is built to finish, after the cement final set, carry out the grouting behind shaft or drift lining operation again, and grouting pressure can reach 0.6～12MPa, and at the bottom of can implementing, the slip casting of multiple tracks stake side multiple spot.Grouting and reinforcing mechanism of the present invention has three aspects: first for infiltrating splicing, and injection slurry is under the high pressure effect, and bigger space in the first filling soil body, and then infiltration soil body hole make soil body solidification by cement.Second is the densification effect, and slurries press near the soft soil body the slip casting point under pressure by force, in slip casting point set mesorelief globulate slurry bubble, by the contiguous soil body of slurry bubble extruding, native mesopore water pressure is raise, along with the dissipation that press in super hole, soil body densification.The 3rd for the splitting effect, when grouting amount and grouting pressure arrive certain value greatly, will produce splitting and stitch in soil layer, and slurries inject the soil body along splitting surface.Three aspect consolidation effects have improved soil strength, have strengthened end resistance and pile side resistance, improve bearing capacity of single pile, increase foundation stiffness.Reach and save cost, reduce foundation settlement, guarantee the purpose of workmanship.Rearmounted grouting device injection is convenient, vibrating hammer is connected with ways, under the exciting force effect and under the guiding of ways, pile grouting pipe and stake side Grouting Pipe are easy to sink to and arrive design elevation in the pile body, and ways can be reused, and pile grouting pipe and stake side Grouting Pipe are stayed in the pile body, can increase the intensity of pile body, the reinforcing bar transmitting vibrations hammer exciting force better of revealing all the details strengthens the rigidity of rearmounted grouting device, and guarantees that ways can not wear in public.
The invention has the beneficial effects as follows: by reinforcing the stake end stake side soil body, solidifying the loosened soil that the stake end may occur, increased substantially bearing capacity of single pile, increase long auger and pressed filling quality of pile stability, reduced workmanship hidden danger, the comparable conventional art of same engineering reduces with the stake amount, both save the energy, saved the Foundation Design investment simultaneously.This invention has increased foundation stiffness by reinforcing the loosened soil that long auger presses a filling stake stake end stake side soil body, curing stake end to occur, and has therefore reduced foundation settlement; The present invention has increased substantially bearing capacity of single pile, has increased foundation stiffness, has reduced long auger and has pressed filling stake workmanship hidden danger, and comparable conventional art reduces with stake to be measured, and saves the Foundation Design investment, has enlarged long auger and has pressed a The Application of Technology scope of irritating.Make traditional long auger press the insurmountable problem of filling stake technology to be readily solved, can be widely used in high level, superelevation layer and other construction work.
(4), description of drawings
Fig. 1 is the schematic diagram of construction method step 1 of the present invention;
Fig. 2 is the schematic diagram of construction method step 2 of the present invention;
Fig. 3 is the schematic diagram of construction method step 3 of the present invention;
Fig. 4 is the schematic diagram of construction method step 4 of the present invention;
Fig. 5 is the schematic diagram of construction method step 5 of the present invention;
Fig. 6 is the schematic diagram of construction method step 6 of the present invention;
Fig. 7 is the schematic diagram of construction method step 7 of the present invention;
Fig. 8 is the effect schematic diagram after the present invention constructs;
Fig. 9 is the structural representation of the rearmounted grouting device embodiment one of the present invention;
Figure 10 is the schematic diagram of A-A section among Fig. 9;
Figure 11 is the schematic diagram of B-B section among Fig. 9;
Figure 12 is the structural representation of the rearmounted grouting device embodiment two of the present invention;
Figure 13 is the schematic diagram of C-C section among Figure 12;
Figure 14 is the schematic diagram of D-D section among Figure 12;
Figure 15 is the schematic diagram of reinforcing bar embodiment of revealing all the details among the embodiment one;
Figure 16 is the schematic diagram of reinforcing bar embodiment of revealing all the details among the embodiment two.
Among the figure: the rearmounted grouting device of 1-; The 2-plain concrete; The 3-vibrating hammer; The 4-ways; 5-pile grouting pipe; 6-stake side Grouting Pipe; 7-pile grouting one way valve; 8-annular stake side slip casting one way valve; 9-spacer bars circle; The 10-reinforcing bar of revealing all the details; The 11-reinforcing cage is indulged muscle; 12-reinforcing cage spiral stirrup; The little steel ring of 13-; 14-rubber.
(5), the specific embodiment
The main feature of job practices of the present invention is, first concrete perfusion pile, after install the grouting behind shaft or drift lining device, pile concrete carries out the slip casting operation after reaching certain intensity (pile concrete build the cement final set that finishes after).Its construction sequence is as follows:
Step 3 is referring to Fig. 3: pumping plain concrete 2 in the stake hole, concrete slump 180～220mm, strength grade C20～C50.
Step 4 is referring to Fig. 4: before pile concrete is built the cement initial set that finishes, above-mentioned grouting device is sling, and placed on the pile body.
Effect after the present invention's construction presses stake end, the stake side soil body of irritating stake to obtain reinforcing referring to Fig. 8.
Referring to Fig. 9～Figure 11, long auger of the present invention is pressed the rearmounted grouting device embodiment one that irritates stake: the spacer bars circle 9 that this postposition grouting device 1 comprises Grouting Pipe 5 at the bottom of at least two piles that place pile body ring week, at least one pile side Grouting Pipe 6, fixedly connected with stake side Grouting Pipe with the pile grouting pipe, be connected in the reinforcing bar 10 of revealing all the details, the vibrating hammer 3 of rearmounted grouting device lower end and be connected in ways 4 bottom the vibrating hammer.At the bottom of the lower end of pile grouting pipe 5 connects pile grouting one way valve 7 and extends, the lower end of pile grouting pipe 5 is tapered, the lower end of stake side Grouting Pipe 6 connects annular stake side slip casting one way valve 8 and places a side, and annular stake side slip casting one way valve 8 is communicated with stake side Grouting Pipe 6 by threeway.Above-mentioned spacer bars circle 9 is 2 meters or 3 meters with the spacing of neighbouring spacer bars circle.Above-mentioned pile grouting pipe is connected with the colligation of spacer bars circle with stake side Grouting Pipe or welds.The above-mentioned reinforcing bar 10 of revealing all the details is critical components of transmitting vibrations hammer exciting force, its tapered pocketed.Pile grouting one way valve 7 and annular stake side slip casting one way valve 8 can be used prior art, on the injected hole that the slip casting tube wall is offered, cover and wrap up in colligation rubber 14 (referring to Figure 15), utilize the elastic deformation characteristic of rubber to prevent the slurries resorption, when grouting pressure was enough big, injection slurry can unidirectionally from the slit of rubber be gone out, can not return.
Referring to Figure 12～14, long auger of the present invention is pressed the rearmounted grouting device embodiment two that irritates stake: different with embodiment one is that a pile grouting pipe 5 and a stake side Grouting Pipe 6 link into an integrated entity with reinforcing cage, the vertical muscle 11 of pile grouting pipe 5, stake side Grouting Pipe 6 and reinforcing cage is positioned on the same circumference, and reinforcing cage spiral stirrup 12 is looped around above-mentioned three's periphery.
The constructed embodiment of a kind of reinforcing bar 10 of revealing all the details of rearmounted grouting device embodiment one is referring to Figure 15, the upper end of two above V-arrangements or U-shaped reinforcing bar is welded on superincumbent spacer bars circle and the pile grouting steel pipe, the stage casing of above-mentioned V-arrangement or U-shaped reinforcing bar is welded on forms the taper pocketed on following spacer bars circle and the pile grouting steel pipe.The stake footpath is big more, and the radical of the reinforcing bar of revealing all the details is many more.The reinforcing bar of revealing all the details can guarantee that ways can not wear in public.
The constructed embodiment of a kind of reinforcing bar of revealing all the details of rearmounted grouting device embodiment two is referring to Figure 16, the above-mentioned reinforcing bar of revealing all the details can utilize the vertical muscle 11 of reinforcing cage to make, to be distributed in the vertical muscle lower end of reinforcing cage circumference to the crooked gathering in the center of circle, and be welded on the little steel ring 13 of bottom and form a taper pocketed, can guarantee that equally ways can not wear in public.
Claims (10)
1. a long auger is pressed and is irritated stake grouting behind shaft or drift lining processing job practices, it is characterized in that construction sequence is as follows:
Step 1: make rearmounted grouting device, this device comprises pile grouting pipe, stake side Grouting Pipe, spacer bars circle, the reinforcing bar of revealing all the details, vibrating hammer and is connected the ways of vibrating hammer lower end, when in the stake reinforcing cage being set, this postposition grouting device and reinforcing cage link into an integrated entity;
Step 2: hole with long-spiral drilling machine;
Step 3: pumping plain concrete in the stake hole, concrete slump 180～220mm;
Step 4: before pile concrete is built the cement initial set that finishes, above-mentioned grouting device is sling, and placed on the pile body;
Step 5: start the vibrating hammer of grouting device,, the grouting behind shaft or drift lining device is sunk in the pile body to design elevation under the exciting force effect and under the guiding of ways;
Step 6: mention vibrating hammer while vibrating and extract ways, close vibrating hammer then, the grouting behind shaft or drift lining device is stayed in the pile body;
Step 7: after treating that pile concrete is built the cement final set that finishes, carry out slip casting by pile grouting pipe, stake side Grouting Pipe, injection slurry is gone out from the slip casting one way valve of pile grouting pipe and stake side Grouting Pipe, near the soil body an injection stake end, the stake side;
Near step 8: form reinforcing area the stake end, the stake side.
2. long auger according to claim 1 is pressed and is irritated stake grouting behind shaft or drift lining processing job practices, and it is characterized in that: in step 3, strength grade of concrete is C20～C50.
3. long auger according to claim 1 is pressed and is irritated stake grouting behind shaft or drift lining processing job practices, and it is characterized in that: in step 7, injection slurry adopts cement paste, water/binder ratio 0.4～1.0, grouting pressure 0.6～12MPa.
4. long auger according to claim 1 is pressed and is irritated the stake grouting behind shaft or drift lining and handle a job practices, it is characterized in that: in step 7, before slip casting, annotate clear water earlier, make the slip casting passage unobstructed after slip casting again.
5. any described long auger of a claim 1-4 is pressed and is irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, it is characterized in that: the spacer bars circle that this device comprises Grouting Pipe at the bottom of at least two piles that place pile body ring week, at least one pile side Grouting Pipe, fixedly connected with stake side Grouting Pipe with the pile grouting pipe, be connected in the reinforcing bar of revealing all the details, the vibrating hammer of pile grouting pipe lower end and be connected in ways bottom the vibrating hammer; At the bottom of pile grouting pipe lower end connected the pile grouting one way valve and extends, the lower end of stake side Grouting Pipe connected annular slip casting one way valve and places a side.
6. long auger according to claim 5 is pressed and is irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, and it is characterized in that: the spacing of above-mentioned spacer bars circle and neighbouring spacer bars circle is a 1-3 rice.
7. long auger according to claim 5 is pressed and irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, it is characterized in that: above-mentioned pile grouting pipe is connected with the colligation of spacer bars circle with stake side Grouting Pipe or welds.
8. long auger according to claim 5 is pressed and is irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, it is characterized in that: above-mentioned pile grouting pipe and stake side Grouting Pipe and reinforcing cage link into an integrated entity, the vertical muscle of pile grouting pipe, stake side Grouting Pipe and reinforcing cage is positioned on the same circumference, and the reinforcing cage spiral stirrup is looped around above-mentioned three's periphery.
9. long auger according to claim 5 is pressed and is irritated the rearmounted grouting device that the stake grouting behind shaft or drift lining is handled job practices, it is characterized in that: the above-mentioned reinforcing bar of revealing all the details is that the upper end with two above V-arrangements or U-shaped reinforcing bar welds on superincumbent spacer bars circle and the pile grouting steel pipe, and the stage casing of above-mentioned V-arrangement or U-shaped reinforcing bar is welded on the taper pocketed thing that forms on following spacer bars circle and the pile grouting steel pipe.
10. long auger according to claim 8 is pressed the rearmounted grouting device of irritating stake grouting behind shaft or drift lining processing job practices, it is characterized in that: the above-mentioned reinforcing bar of revealing all the details is to utilize the vertical muscle lower end of the reinforcing cage that is distributed in the reinforcing cage circumference to the crooked taper pocketed thing that draws in and weld in the center of circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102000468A CN100476082C (en) | 2007-01-12 | 2007-01-12 | Post-grouting construction method for long helical bore grouting pile and grouting device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102000468A CN100476082C (en) | 2007-01-12 | 2007-01-12 | Post-grouting construction method for long helical bore grouting pile and grouting device thereof |
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| CN101054799A true CN101054799A (en) | 2007-10-17 |
| CN100476082C CN100476082C (en) | 2009-04-08 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102561360A (en) * | 2012-02-06 | 2012-07-11 | 化学工业岩土工程有限公司 | Deep foundation pit supporting method |
| CN103174135A (en) * | 2011-12-23 | 2013-06-26 | 五冶集团上海有限公司 | Repair method of unqualified post-grouting bored concrete pile |
| CN103184738A (en) * | 2012-10-20 | 2013-07-03 | 二十二冶集团第一建设有限公司 | Grouting guide pipe restraint ring mounting structure and method for mounting grouting guide pipes by using restraint rings |
| CN104711975A (en) * | 2015-03-24 | 2015-06-17 | 北京中岩大地工程技术有限公司 | Construction technology for long spiral cast-in-situ bored pile |
| CN106337417A (en) * | 2016-08-30 | 2017-01-18 | 十四冶建设云南勘察设计有限公司 | Post-grouting method for pile end of rotary excavation pile |
| CN106638607A (en) * | 2016-11-24 | 2017-05-10 | 中航勘察设计研究院有限公司 | Connecting method for grouting pipe and reinforcement cage in pile foundation post grouting construction |
| CN108716216A (en) * | 2018-05-22 | 2018-10-30 | 四川城凯特建设工程有限公司 | Long auger guncreting pile molding construction method and its additional reinforcement device |
| CN108867625A (en) * | 2018-07-20 | 2018-11-23 | 四川锦城智信建设工程有限公司 | Long auger guncreting pile grouting behind shaft or drift lining handles construction method and its postposition grouting device |
| CN110153335A (en) * | 2019-04-28 | 2019-08-23 | 云南建投第一勘察设计有限公司 | A kind of processing method of long screw auger drilling deposited pile steel reinforcement cage |
| CN110397027A (en) * | 2018-04-25 | 2019-11-01 | 上海城地建设股份有限公司 | The compound pile constructing process of Stiffened Soil |
| CN112281824A (en) * | 2020-10-30 | 2021-01-29 | 黄淮学院 | Post-grouting construction method for pile bottom of post-inserted reinforcement cage of cast-in-place concrete pile |
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- 2007-01-12 CN CNB2007102000468A patent/CN100476082C/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103174135A (en) * | 2011-12-23 | 2013-06-26 | 五冶集团上海有限公司 | Repair method of unqualified post-grouting bored concrete pile |
| CN103174135B (en) * | 2011-12-23 | 2015-06-03 | 五冶集团上海有限公司 | Repair method of unqualified post-grouting bored concrete pile |
| CN102561360B (en) * | 2012-02-06 | 2015-04-29 | 化学工业岩土工程有限公司 | Deep foundation pit supporting method |
| CN102561360A (en) * | 2012-02-06 | 2012-07-11 | 化学工业岩土工程有限公司 | Deep foundation pit supporting method |
| CN103184738A (en) * | 2012-10-20 | 2013-07-03 | 二十二冶集团第一建设有限公司 | Grouting guide pipe restraint ring mounting structure and method for mounting grouting guide pipes by using restraint rings |
| CN103184738B (en) * | 2012-10-20 | 2015-02-04 | 二十二冶集团第一建设有限公司 | Grouting guide pipe restraint ring mounting structure and method for mounting grouting guide pipes by using restraint rings |
| CN104711975A (en) * | 2015-03-24 | 2015-06-17 | 北京中岩大地工程技术有限公司 | Construction technology for long spiral cast-in-situ bored pile |
| CN106337417B (en) * | 2016-08-30 | 2019-05-24 | 云南建投第一勘察设计有限公司 | A kind of rotary digging stake pile-end post-grouting method |
| CN106337417A (en) * | 2016-08-30 | 2017-01-18 | 十四冶建设云南勘察设计有限公司 | Post-grouting method for pile end of rotary excavation pile |
| CN106638607A (en) * | 2016-11-24 | 2017-05-10 | 中航勘察设计研究院有限公司 | Connecting method for grouting pipe and reinforcement cage in pile foundation post grouting construction |
| CN110397027A (en) * | 2018-04-25 | 2019-11-01 | 上海城地建设股份有限公司 | The compound pile constructing process of Stiffened Soil |
| CN108716216A (en) * | 2018-05-22 | 2018-10-30 | 四川城凯特建设工程有限公司 | Long auger guncreting pile molding construction method and its additional reinforcement device |
| CN108867625A (en) * | 2018-07-20 | 2018-11-23 | 四川锦城智信建设工程有限公司 | Long auger guncreting pile grouting behind shaft or drift lining handles construction method and its postposition grouting device |
| CN110153335A (en) * | 2019-04-28 | 2019-08-23 | 云南建投第一勘察设计有限公司 | A kind of processing method of long screw auger drilling deposited pile steel reinforcement cage |
| CN110153335B (en) * | 2019-04-28 | 2021-09-03 | 云南建投第一勘察设计有限公司 | Processing method of long spiral drilling cast-in-place pile reinforcement cage |
| CN112281824A (en) * | 2020-10-30 | 2021-01-29 | 黄淮学院 | Post-grouting construction method for pile bottom of post-inserted reinforcement cage of cast-in-place concrete pile |
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| CN100476082C (en) | 2009-04-08 |
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Application publication date: 20071017 Assignee: Beijing Geotechnical Engineering Association Assignor: Jianyan Foundation Engineering LLC Contract record no.: 2015990000889 Denomination of invention: Post-grouting construction method for long helical bore grouting pile and its grouting device Granted publication date: 20090408 License type: Exclusive License Record date: 20151026 |
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Assignee: Beijing Geotechnical Engineering Association Assignor: CABR FOUNDATION ENGINEERING Co.,Ltd. Contract record no.: 2015990000889 Date of cancellation: 20201120 |
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Application publication date: 20071017 Assignee: Beijing Geotechnical Engineering Association Assignor: CABR FOUNDATION ENGINEERING Co.,Ltd. Contract record no.: X2020990000617 Denomination of invention: Construction method of post grouting treatment of Long Auger Bored Pile and its post grouting device Granted publication date: 20090408 License type: Exclusive License Record date: 20201120 |