CN110130346A - Hammer the prefabricated pile pile-sinking device and construction method in conjunction with static pressure - Google Patents
Hammer the prefabricated pile pile-sinking device and construction method in conjunction with static pressure Download PDFInfo
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- CN110130346A CN110130346A CN201910454314.1A CN201910454314A CN110130346A CN 110130346 A CN110130346 A CN 110130346A CN 201910454314 A CN201910454314 A CN 201910454314A CN 110130346 A CN110130346 A CN 110130346A
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- pile
- sinking
- prefabricated
- feeder
- hammer
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- 230000003068 static effect Effects 0.000 title claims abstract description 36
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000002689 soil Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 230000000739 chaotic effect Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005056 compaction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002283 diesel fuel Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 206010052428 Wound Diseases 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000282693 Cercopithecidae Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/26—Placing by using several means simultaneously
Abstract
The present invention relates to prefabricated pile pile-sinking device and construction method of a kind of hammering in conjunction with static pressure, including large full hydraulic walking-type pile driver and additional static press device, additional static press device include: guide rod diesel hammer；The upper end of guide rod diesel hammer is connected by wirerope with hoist engine；The lower end of guide rod diesel hammer is connected with the upper end of Pile feeder；Pile feeder top is provided with conversion equipment；The lower end of Pile feeder is provided with prefabricated pile body；Top sheave group is provided on top sheave pack support；Lower sheave group is provided on lower sheave pack support；Lower sheave group and top sheave group constitute running block.The present invention hammers the prefabricated pile pile-sinking device in conjunction with static pressure, can preferably control pile sinking speed in mud pile sinking, reduce safety accident；It avoids and causes object strike to injure construction personnel near tubular pole；Reduce diesel oil usage amount, to reduce exhaust emission；Reduce noise pollution；Reduce deflected file and floating that soil compaction effect causes complete stake；Reduce construction cost.
Description
Technical field
The present invention relates to a kind of construction techniques, in particular to a kind of prefabricated pile of hammering in conjunction with static pressure
Pile-sinking device and construction method.
Background technique
The pile sinking process of China's tradition prefabricated pile mainly has hammer piling and static pressure pile-sinking, and wherein hammer piling is to utilize stake
Temporary impact mechanical energy when hammer falls, overcomes the soil body to destroy its static balancing state to the resistance of stake, lead to pile body
Sink, reaches new static balance state, hammer pile crown repeatedly, pile body also just constantly sinks.
Hammer piling is the most common pile sinking process of prefabricated pile.The method speed of application is fast, and mechanization degree is high, adaptation range
Extensively, but when constructing there are the public hazards such as soil compaction, noise and vibration, be restricted in down town and carrying on construction work at night；Static pressed pile piling construction
It is to provide counter-force by the mechanism of pile of static pile press with the counterweight in pile press machine self weight and rack prefabricated pile is pressed into soil
In process for sinking, have when can completely avoid vibration, noise and pollution caused by impact pile driving, therefore construct to stake nothing
Destroy, construct it is noiseless, without friction, without impact force, it is pollution-free the advantages that, but high equipment cost, construction cost are relatively high.
In south China many engineerings in coastal area are built on muddy foundation, and even filling in the sea to grow grain to form
On ground, soil property is soft, some journey liquid-plastic states, and when using sunk by hammer, before tubular pole penetrates mud, tubular pole is in its self weight
Can quickly it sink under the pressure of pile monkey self weight, such as sinking control will cause to damage to stake machine lifting system by force, not control
Pile body verticality will be caused not can guarantee, final tubular pole bearing capacity is impacted；Even due to the unexpected stress of wirerope, lead to steel wire
Fracture of rope wounds construction personnel nearby, causes safety accident；In sinking watching quickly due to subsidence velocity, constructor is also given
Member causes very big security risk.
Summary of the invention
In view of the deficiency of the prior art, the present invention provides a kind of guarantee construction quality, reduces the abnormal of equipment
Engineering cost is saved in damage, guarantees construction safety, reduces the hammering of soil compaction effect, noise and exhaust emission in conjunction with static pressure
Prefabricated pile pile-sinking device.
The technical solution used in the present invention is:
A kind of prefabricated pile pile-sinking device hammered in conjunction with static pressure,
It include: large full hydraulic walking-type pile driver and additional static press device；
Additional static press device includes: guide rod diesel hammer；The upper end of guide rod diesel hammer is connected by wirerope with hoist engine；
The lower end of guide rod diesel hammer is connected with the upper end of Pile feeder；
Pile feeder top is provided with conversion equipment；
The lower end of Pile feeder is provided with prefabricated pile body；
The two sides of conversion equipment are symmetrically arranged with top sheave pack support；
Top sheave group is provided on top sheave pack support；
Downslide wheel support is provided with below top sheave pack support；
Lower sheave group is provided on lower sheave pack support；
Lower sheave pack support is connected with piling platform；
Main winch wirerope is connected by fixed pulley with lower sheave group and top sheave group；
Lower sheave group and top sheave group constitute running block.
The conversion equipment is bucking ladder, is provided with through-hole in the middle part of bucking ladder；Conversion equipment is fixed on Pile feeder.
The Pile feeder is provided with release unit；
Release unit is including being that L-type is linked up with and guide plate, L-type link up with the middle and lower part for being fixed on Pile feeder；Guide plate is arranged in master
On the slideway of bar, guide plate one end is connected by sliding sleeve with slideway；Guide plate is slided up and down along slideway；The guide plate other end is set
It is equipped with pilot hole；Pilot hole upper end diameter is less than lower end diameter；The horizontal segment of L-type hook is connected with Pile feeder；L-type hook
The upper end cross-sectional area of vertical section is less than lower end cross-sectional area；In the pilot hole of the vertical section insertion guide plate of L-type hook；Slideway
Lower part is provided with the limiting device of release unit.The lower sheave group is made of 4-6 pulley.
It is described to send dress device for diameter 450mm, long 4-8 meters of thick walled steel tube.
A kind of construction method hammering the prefabricated pile pile-sinking device in conjunction with static pressure,
Progress position of p ile machine, the setting-out of stake position, prefabricated pile positioning, prefabricated pile connection are consistent with traditional hammer piling first；
In soft soil layer pile sinking, open main winch, by tightening wirerope and each pulley blocks to prefabricated pile provide one to
Under power, prefabricated pile is sunk in soil, and complete first segment stake piling construction；
First segment stake pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, together
When master winch loosen wirerope, will send dress device improve to next pile feed stake position, carry out lower section pile driving construction；It similarly completes subsequent
Prefabricated pile pile sinking in soft soil layer.
When prefabricated pile enters the high stratum of bearing capacity, the downward power that hoist engine and pulley blocks provide is less than penetrating resistance
When, be converted to hammer piling；
During hammer piling, need to according to the subsidence velocity of prefabricated pile, to tighten in time wirerope prevent groove skipping of steel rope while and
It is chaotic；
Pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, while master winch
Loosen wirerope, dress device will be sent to improve to next pile and feed stake position, lower section pile driving construction is carried out, until reaching designed elevation or stopping
Hammer standard completes a prefabricated pile piling construction.
The present invention compared with the prior art the utility model has the advantages that
The present invention hammers the prefabricated pile pile-sinking device and construction method in conjunction with static pressure, avoids the quick sinking of tubular pole to equipment
Damage；It avoids the unexpected stress of wirerope to be broken, reduces safety accident；It avoids and construction personnel near tubular pole is caused
Object strike injury；Reduce diesel oil usage amount, to reduce exhaust emission；Reduce noise pollution；Reduce soil compaction effect
It should cause the deflected file and floating of complete stake；Construction cost is also reduced simultaneously, there is good economic benefit and society's effect
Benefit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure；
Fig. 2 is that the guide rod diesel hammer of prefabricated pile pile-sinking device and the connection structure of Pile feeder of the present invention hammering in conjunction with static pressure show
It is intended to；
Fig. 3 is the downslide wheel support of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure and the connection structure of lower sheave group
Schematic diagram；
Fig. 4 is the top sheave bracket of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure and the connection structure of top sheave group
Schematic diagram；
Fig. 5 is that the release unit of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure and Pile feeder vertical view connection structure are shown
It is intended to；
Fig. 6 is the release unit of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure and the structure of Pile feeder connection status
Schematic diagram；
Fig. 7 is the release unit of prefabricated pile pile-sinking device of the present invention hammering in conjunction with static pressure and the structure of Pile feeder disengaged position
Schematic diagram.
Main component symbol description in attached drawing:
In figure:
1, large full hydraulic walking-type pile driver
2, main winch
3, guide rod diesel hammer 4, wirerope
5, Pile feeder 6, conversion equipment
7, prefabricated pile body 8, top sheave pack support
9, top sheave group 10, downslide wheel support
11, lower sheave group 12, piling platform
13, fixed pulley 14, mobile jib
15, wirerope 16, counterweight.
Specific embodiment
Referring to the drawings and embodiment the present invention will be described in detail:
Attached drawing 1-7 it is found that a kind of prefabricated pile pile-sinking device of the hammering in conjunction with static pressure,
It include: large full hydraulic walking-type pile driver 1 and main winch 2；
Large full hydraulic walking-type pile driver includes: guide rod diesel hammer 3；The upper end of guide rod diesel hammer 3 passes through wirerope 4 and elevator
Machine 2 is connected；
The lower end of guide rod diesel hammer 3 is connected with the upper end of Pile feeder 5；
5 top of Pile feeder is provided with conversion equipment 6；
The lower end of Pile feeder 5 is provided with prefabricated pile body 7；
The two sides of conversion equipment 6 are symmetrically arranged with top sheave pack support 8；
Top sheave group 9 is provided on top sheave pack support 8；
The lower section of top sheave pack support 8 is provided with downslide wheel support 10；
Lower sheave group 11 is provided on lower sheave pack support 10；
Lower sheave pack support 10 is connected with piling platform 12；
Main winch wirerope 4 is connected by fixed pulley 13 with lower sheave group 11 and top sheave group 9；
14 two sides of mobile jib of large full hydraulic walking-type pile driver are respectively arranged with fixed pulley 13.
Lower sheave group 11 and top sheave group 9 constitute running block.
The conversion equipment is bucking ladder, is provided with through-hole in the middle part of bucking ladder；Conversion equipment 6 is sleeved on Pile feeder 5.
The Pile feeder is provided with release unit；Release unit includes for L-type hook 21 and guide plate 22, L-type hook 21
It is fixed on the middle and lower part of Pile feeder 5；Guide plate 22 is arranged on the slideway 23 of mobile jib 14,22 one end of guide plate by sliding sleeve 24 with
Slideway 23 is connected；Guide plate 22 is slided up and down along slideway 23；22 other end of guide plate is provided with pilot hole 25；On pilot hole 25
Diameter is held to be less than lower end diameter；The horizontal segment 212 of L-type hook is connected with Pile feeder 5；L-type links up with the upper of 21 vertical section 211
Cross-sectional area is held to be less than lower end cross-sectional area；The vertical section 211 of L-type hook is inserted into the pilot hole 25 of guide plate；Under slideway 23
Portion is provided with the limiting device of release unit, and limiting device restricted guidance plate moves down.
Pile feeder 5 from bottom to top in moving process, be inserted into the pilot hole 25 of guide plate by the vertical section 211 of L-type hook, leads
To plate limitation Pile feeder at a distance from slideway；Pile feeder 5 from bottom to top in moving process, lead by the insertion of vertical section 211 of L-type hook
Into the pilot hole 25 of plate, guide plate limits Pile feeder at a distance from slideway；When guide plate encounters limiting device can not be to moving down
When dynamic, the vertical section of L-type hook and the pilot hole of guide plate are detached from；The vertical section of L-type hook is wedge shaped, the guiding of guide plate
Hole is wedged hole.
The lower sheave group is made of 4-6 pulley.
It is described to send dress device for diameter 450mm, long 4-8 meters of thick walled steel tube.
A kind of construction method hammering the prefabricated pile pile-sinking device in conjunction with static pressure,
Progress position of p ile machine, the setting-out of stake position, prefabricated pile positioning, prefabricated pile connection are consistent with traditional hammer piling first；
In soft soil layer pile sinking, open main winch, by tightening wirerope and each pulley blocks to prefabricated pile provide one to
Under power, prefabricated pile is sunk in soil, and complete first segment stake piling construction；
First segment stake pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, together
When master winch loosen wirerope, will send dress device improve to next pile feed stake position, carry out lower section pile driving construction；It similarly completes subsequent
Prefabricated pile pile sinking in soft soil layer.
When prefabricated pile enters the high stratum of bearing capacity, the downward power that hoist engine and pulley blocks provide is less than penetrating resistance
When, be converted to hammer piling；
During hammer piling, need to according to the subsidence velocity of prefabricated pile, to tighten in time wirerope prevent groove skipping of steel rope while and
It is chaotic；
Pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, while master winch
Loosen wirerope, dress device will be sent to improve to next pile and feed stake position, lower section pile driving construction is carried out, until reaching designed elevation or stopping
Hammer standard completes a prefabricated pile piling construction.
The present invention hammers the prefabricated pile pile-sinking device in conjunction with static pressure, avoids damage of the quick sinking to equipment of tubular pole
Wound；It avoids the unexpected stress of wirerope to be broken, reduces safety accident；It avoids and object is caused to construction personnel near tubular pole
Strike injury；Reduce diesel oil usage amount, to reduce exhaust emission；Reduce noise pollution；Reduce soil compaction effect to make
At the deflected file and floating of complete stake；Construction cost is also reduced simultaneously, there is good economic benefit and social benefit.
The above described is only a preferred embodiment of the present invention, not making in any form to structure of the invention
Limitation.Any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention,
Belong within the scope of technical solution of the present invention.
Claims (6)
1. a kind of prefabricated pile pile-sinking device of hammering in conjunction with static pressure, it is characterised in that:
It include: large full hydraulic walking-type pile driver and additional static press device；
Additional static press device includes: guide rod diesel hammer；The upper end of guide rod diesel hammer is connected by wirerope with hoist engine；
The lower end of guide rod diesel hammer is connected with the upper end of Pile feeder；
Pile feeder top is provided with conversion equipment；
The lower end of Pile feeder is provided with prefabricated pile body；
The two sides of conversion equipment are symmetrically arranged with top sheave pack support；
Top sheave group is provided on top sheave pack support；
Downslide wheel support is provided with below top sheave pack support；
Lower sheave group is provided on lower sheave pack support；
Lower sheave pack support is connected with piling platform；
Main winch wirerope is connected by fixed pulley with lower sheave group and top sheave group；
Lower sheave group and top sheave group constitute running block.
2. prefabricated pile pile-sinking device of the hammering in conjunction with static pressure according to claim 1, it is characterised in that: the conversion equipment
For bucking ladder, bucking ladder middle part is provided with through-hole；Conversion equipment is fixed on Pile feeder.
3. prefabricated pile pile-sinking device of the hammering in conjunction with static pressure according to claim 1, it is characterised in that: the Pile feeder is set
It is equipped with release unit；Release unit is including being that L-type is linked up with and guide plate, L-type link up with the middle and lower part for being fixed on Pile feeder；Guide plate
It is arranged on the slideway of mobile jib, guide plate one end is connected by sliding sleeve with slideway；Guide plate is slided up and down along slideway；Guide plate
The other end is provided with pilot hole；Pilot hole upper end diameter is less than lower end diameter；The horizontal segment of L-type hook is connected with Pile feeder；L
The upper end cross-sectional area of the vertical section of type hook is less than lower end cross-sectional area；The guiding of the vertical section insertion guide plate of L-type hook
In hole；Slideway lower part is provided with the limiting device of release unit.
4. prefabricated pile pile-sinking device of the hammering in conjunction with static pressure according to claim 1, it is characterised in that: the lower sheave group
It is made of 4-6 pulley.
5. prefabricated pile pile-sinking device of the hammering with static pressure in conjunction with according to claim 1, it is characterised in that: described send fills device and be
Diameter 450mm, long 4-8 meters of thick walled steel tube.
6. a kind of construction method of prefabricated pile pile-sinking device of the hammering described in claim 1 to 5 any one in conjunction with static pressure,
It is characterized by:
Progress position of p ile machine, the setting-out of stake position, prefabricated pile positioning, prefabricated pile connection are consistent with traditional hammer piling first；
In soft soil layer pile sinking, open main winch, by tightening wirerope and each pulley blocks to prefabricated pile provide one to
Under power, prefabricated pile is sunk in soil, and complete first segment stake piling construction；
First segment stake pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, together
When master winch loosen wirerope, will send dress device improve to next pile feed stake position, carry out lower section pile driving construction；It similarly completes subsequent
Prefabricated pile pile sinking in soft soil layer；
When prefabricated pile enters the high stratum of bearing capacity, and the downward power that hoist engine and pulley blocks provide is less than penetrating resistance, turn
It is changed to hammer piling；
During hammer piling, need to according to the subsidence velocity of prefabricated pile, to tighten in time wirerope prevent groove skipping of steel rope while and
It is chaotic；
Pile sinking finishes, and by the original main hook of stake machine, guide rod diesel hammer is lifted together with conversion equipment, Pile feeder, while master winch
Loosen wirerope, dress device will be sent to improve to next pile and feed stake position, lower section pile driving construction is carried out, until reaching designed elevation or stopping
Hammer standard completes a prefabricated pile piling construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454314.1A CN110130346A (en) | 2019-05-29 | 2019-05-29 | Hammer the prefabricated pile pile-sinking device and construction method in conjunction with static pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910454314.1A CN110130346A (en) | 2019-05-29 | 2019-05-29 | Hammer the prefabricated pile pile-sinking device and construction method in conjunction with static pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110130346A true CN110130346A (en) | 2019-08-16 |
Family
ID=67582600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910454314.1A Withdrawn CN110130346A (en) | 2019-05-29 | 2019-05-29 | Hammer the prefabricated pile pile-sinking device and construction method in conjunction with static pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110130346A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188336A (en) * | 2020-01-14 | 2020-05-22 | 中国十七冶集团有限公司 | Method for piling and feeding PHC piles in backfilled and dug foundation area |
| CN112609692A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of prestressed pipe pile in complex geological area filled with sea |
| CN112647502A (en) * | 2020-12-21 | 2021-04-13 | 王云帅 | Rock stratum high efficiency mechanical equipment that punches |
| CN112921966A (en) * | 2021-01-22 | 2021-06-08 | 中欧国际建工集团有限公司 | Device for ensuring pile end of precast pile to enter bearing stratum and construction method thereof |
| CN113481993A (en) * | 2021-08-13 | 2021-10-08 | 中国二十二冶集团有限公司 | Drilling and soil taking synchronous hammering integrated device in sludge soft soil tubular pile |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421328Y (en) * | 2000-04-04 | 2001-02-28 | 李伟之 | Rope-pulling jacked static pile press |
| CN203834480U (en) * | 2014-05-15 | 2014-09-17 | 国强建设集团有限公司 | Static pressure hammering integrated pile machine |
-
2019
- 2019-05-29 CN CN201910454314.1A patent/CN110130346A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421328Y (en) * | 2000-04-04 | 2001-02-28 | 李伟之 | Rope-pulling jacked static pile press |
| CN203834480U (en) * | 2014-05-15 | 2014-09-17 | 国强建设集团有限公司 | Static pressure hammering integrated pile machine |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188336A (en) * | 2020-01-14 | 2020-05-22 | 中国十七冶集团有限公司 | Method for piling and feeding PHC piles in backfilled and dug foundation area |
| CN111188336B (en) * | 2020-01-14 | 2021-06-11 | 中国十七冶集团有限公司 | Method for piling and feeding PHC piles in backfilled and dug foundation area |
| CN112609692A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of prestressed pipe pile in complex geological area filled with sea |
| CN112647502A (en) * | 2020-12-21 | 2021-04-13 | 王云帅 | Rock stratum high efficiency mechanical equipment that punches |
| CN112647502B (en) * | 2020-12-21 | 2022-07-22 | 山东鼎信岩土科技有限公司 | Rock stratum punching pile mechanical equipment |
| CN112921966A (en) * | 2021-01-22 | 2021-06-08 | 中欧国际建工集团有限公司 | Device for ensuring pile end of precast pile to enter bearing stratum and construction method thereof |
| CN112921966B (en) * | 2021-01-22 | 2022-02-11 | 中欧国际建工集团有限公司 | Device for ensuring pile end of precast pile to enter bearing stratum and construction method thereof |
| CN113481993A (en) * | 2021-08-13 | 2021-10-08 | 中国二十二冶集团有限公司 | Drilling and soil taking synchronous hammering integrated device in sludge soft soil tubular pile |
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Application publication date: 20190816 |