CN1584220A - Composite foundation comprehensive treatment with self anchored vacuum compact rigid piles - Google Patents
Composite foundation comprehensive treatment with self anchored vacuum compact rigid piles Download PDFInfo
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- CN1584220A CN1584220A CN 03153625 CN03153625A CN1584220A CN 1584220 A CN1584220 A CN 1584220A CN 03153625 CN03153625 CN 03153625 CN 03153625 A CN03153625 A CN 03153625A CN 1584220 A CN1584220 A CN 1584220A
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Abstract
The present invention relates to a ground treatment method. Said method is characterized by that in the deep-thick soft soil layer a kind of 'self anchorage loading vacuum water-reducing rigid pile body device' is used. Said device can utilize pulling resistance action of rigid pile body in the stratum to apply precompression to the soil layer between piles, has no need of externally-adding load; and said device has the functions of pumping and discharging underground water and evacuation in the stratum, so that it can quickly and forcedly reduce water content in the soft oil layer between piles, and can produce negative pressure in the stratum so as to raise strength of soil between piles and increase bearing force, and further raise load-bearing capacity of the pile.
Description
The present invention relates to a kind of method for processing foundation.Rigid pile composite foundation processing method particularly.
Rigid pile composite foundation is a kind of novel method for processing foundation of Recent study exploitation, it is long that it has effective length, be out of shape little, can give full play to the bearing capacity of inter-pile soil and stake end soil, the Bearing Capacity of Composite Foundation height, hang down advantages such as more than pile foundation cost, thereby promoted the use of rapidly, but rigid pile composite foundation there is distortion radical in deep soft soil; Rigid pile mostly is the low grade plain concrete pile, and construction easily makes earth heaving and stake is pulled off in soft layer; Setting of rigid pile not only do not have improving effect to all soft layers of stake, defectives such as perturbation action arranged on the contrary, therefore less employing in soft foundation.
The object of the present invention is to provide a kind of deep soft soil foundation processing that is fit to, soft layer between stake is had better reinforcing improving effect, and earth heaving, quick construction are not afraid of in construction, the rigid pile composite foundation processing method that Bearing Capacity of Composite Foundation height, cost are lower relatively.
The invention is characterized in: in the deep soft layer that needs are handled, set a kind of " loading vacuum-dewatering rigid pile body device " (seeing figure one: load vacuum-dewatering rigid pile body device schematic diagram) from anchor from anchor, this device is to utilize the precompressed of the resistance to plucking masterpiece counter-force enforcement of rigidity pile body in the stratum to the inter-pile soil layer, does not need the imposed load thing; This device has pump drainage underground water and vacuumizes in the stratum function can force to reduce the water content of soft layer between stake fast and produce negative pressure in the stratum; By precompressed and precipitation effect to the inter-pile soil layer, inter-pile soil intensity is improved and the bearing capacity increase, the bearing capacity that the raising of inter-pile soil intensity can be converted into stake again improves, and this complementary effect is greatly improved the rigid pile composite foundation bearing capacity; The pull bar of this device and pump drainage water, vacuum extractor all can be handled the back at ground and remove recycling, save material and reduce cost.
Technical scheme of the present invention is such: a kind of " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method ", this method is to set " loading vacuum-dewatering rigid pile body device from anchor " in the stratum, (seeing figure one), this device pile body is prefabricated permeable concrete pipe (4) and airtight concrete pipe (7), be provided with pull bar (5) in the pipe, hold-down nut (2) in pull bar (5) bottom and the load transfer pier (1) is connected, can transmit pile body resistance to plucking frictional resistance, utilize this frictional resistance can form, and implement precompressed inter-pile soil to the inter-pile soil applied pressure; The permeable concrete pipe of this device usefulness (4) can be filtered the underground water that collects in the stratum in pile body, puts into submersible pump (3) (or other pump drainage water device) pump drainage underground water in the pile body; Airtight concrete pipe (7) is installed on this device pile body top certain-length (deciding according to concrete strata condition), and at top installation seal cover board (8), make the top seal of pile body pipe, seal cover board (8) is provided with vacuum pumping hole (6), like this in pump drainage vacuum in pile body of phreatic while of pump drainage, its effect: 1. quicken pore water seepage flow in the pile body pipe, force to reduce the water content (also can be aided with electroosmosis method in case of necessity) in the soil body; 2. in the stratum, form negative pressure, can be converted into the effective stress of inside, stratum, play the precompressed effect; 3. the groundwater table reduction also makes effective stress increase in the soil body, forms the part prefabricating load.By precipitation and precompressed effect to the stratum, the water content of inter-pile soil is reduced and the compactness raising, the raising of inter-pile soil compactness makes the pile side friction increase again and makes the rigid pile bearing capacity become big, thereby makes the rigid pile composite foundation bearing capacity be able to further raising.After precompressed was finished, pull bar (5), pump drainage wetting system and ground all article in this device pile body all can reuse; For on lift from hollow section under the load transfer pier (1) of bearing stratum when pulling out, available hammer ram or with the vibrations immersed tube it is rammed with bearing stratum and combine closely pours into a small amount of concrete in load transfer pier and pile body pipe bottom then and makes it to be connected the transmission load.
Loading vacuum-dewatering rigid pile body device from anchor is work like this: with the mode pore-forming of immersed tube or boring, after connecting load transfer pier (1), permeable concrete pipe (4), airtight concrete pipe (7) and pull bar (5) well then, put into the hole, extract the gap (if Completion of Drilling Hole) that stake is managed (if immersed tube pore-forming) or filled up pile body pipe and hole wall with medium coarse sand; Submersible pump (3) and gutter (11) (or other pump drainage water device) are put into pile body, sealing rubber pad (12), seal cover board (8), caulking gum nut (13), hold-down bolt (9) are installed on pile body pipe top, make sealing in the pile body pipe; Vaccum-pumping equipment (15) is connected on the vacuum pumping hole (6), so that pump drainage underground water and aspiration vacuum; Inner ring pressing plate (14) and outer ring pressing plate (19) are installed, on outer ring pressing plate (19), put counter-force roof beam structure (17), pull bar (5) is connected with clamp nut (16) with counter-force roof beam structure (17) compresses, apply definite load with jack (20) to outer ring pressing plate (19), 4 studdles (18) that firmly tighten on the counter-force roof beam structure (17) firmly are supported on the outer ring pressing plate (19), so that after withdrawing from jack (20), still transmit pressure to outer ring pressing plate (19); Inner ring pressing plate (14) can not made continuous ballast because it influences the degree of depth and scope is all less, can do the loading of short time when the shallow-layer soil body reaches optimum moisture content and get final product densification.
The requirement that loads vacuum-dewatering rigid pile body device critical piece from anchor is such: available concrete of load transfer pier (1) or iron work, size and intensity should be determined according to selected stake footpath and the maximum uplift resistance calculating of being born, as use concrete, its intensity should be less than C25; Permeable concrete pipe (4) and airtight concrete pipe (7) adopt steel concrete to make, its concrete strength and amount of reinforcement also fibrous root according to pile body bearing capacity and uplift resistance, pressing code requirement calculates definite, the making length of every pipe joint can comprehensively be determined according to conditions such as making, maintenance, transportation, installations; Finish rolling deformed bar or the good material of other tensile property that pull bar (5) selects for use the post stressed concrete member to use, its sectional dimension fibrous root is selected for use according to maximum uplift resistance; Pressing plate (19), (14) select for use concrete or steel plate make all can, planar dimension determines according to pile spacing, thickness of slab and arrangement of reinforcement (as being concrete component) carry out structural calculation according to maximum prefabricating load and lifting travel position and determine; Counter-force roof beam structure (17) is a steel structure member, and its size materials should calculate according to maximum counter-force to be determined; Pump drainage underground water and vacuumize used submersible pump (3) and vaccum-pumping equipment (15) (also available other device), its performance should satisfy the requirement of precipitation and aspiration vacuum; The requirement that must satisfy sealing is installed and used to seal cover board (8) with steel plate processing; Jack (20) should have metering device, accurately the control loaded amount.
The present invention relatively is fit to deep weak viscous soil horizon with general rigid pile composite foundation, soft layer between stake is had reinforce improving effect preferably, and earth heaving is not afraid of in construction, quick construction, and the Bearing Capacity of Composite Foundation height, cost is lower relatively.
Embodiment: certain engineering is built 50000m on coastal soft foundation
34 in steel oil storage tank and 20000m
32 in steel oil storage tank, tank foundation adopt ringwall formula flexible foundation, and the foundation bottom load is 240kPa, and its strata condition sees the following form:
The foundation soil mechanics index of physics
| Sequence number | Lithology | Thickness (m) | Water content (%) | Severe (kN) | Void ratio | Four-bladed vane (kPa) | Modulus of compressibility (kPa) | Limit side resistance (kPa) |
| ?1 | Silty clay | 1.5 | ?30 | ?18.6 | ?0.901 | ?20 | ?5.1 | ?26 |
| ?2 | Clay | 0.6 | ?40.1 | ?18.1 | ?0.952 | ?29 | ?3.5 | ?30 |
| ?3 | Mud matter is sticking | 1.3 | ?52 | ?17.6 | ?1.349 | ?15 | ?2.65 | ?13 |
| ?4 | Silty clay | 6.0 | ?34 | ?18.5 | ?0.935 | ?20 | ?5.0 | ?28 |
| ?5 | Mud matter powder | 7.2 | ?50 | ?17.5 | ?1.238 | ?14 | ?2.8 | ?16 |
| ?6 | Silty clay | 2.4 | ?33 | ?19.1 | ?0.85 | ?21 | ?7.1 | ?65 |
| ?7 | Flour sand | 2.2 | ?32 | ?18.9 | ?0.79 | ?14.1 | ?85 | |
| ?8 | Silty clay | 11 | ?31 | ?19.2 | ?0.86 | ?10.5 |
What this engineering adopted is the plain concrete rigid pile composite foundation, after suggestion is with one of them 20000m
3Petroleum tank carries out ground with the present invention's " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method " to be handled, and has obtained effect preferably, and the Technological Economy of two kinds of methods is compared as follows table:
Two kinds of economic comparison sheets of method and technology
Can find out from above comparison: " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method " has remarkable advantages, what is more important: this method metering observation data control by strictness in whole construction course is carried out, be the intellectuality construction, processing procedure and effect are intuitively easy to control, and construction quality easily guarantees.
The present invention can suit measures to local conditions to select for use equipment such as the heavy tube drawing stake machine of vibrations, revolution auger, auger machine, diesel hammer stake machine to construct, and used material is constructional materials commonly used, and construction technology is simple, is easy to promote.
Claims (4)
1. one kind " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method ".The invention is characterized in: in the deep soft layer that needs are handled, adopt " loading vacuum-dewatering rigid pile body device " (seeing figure one) from anchor, this device is to utilize the precompressed of the resistance to plucking masterpiece counter-force enforcement of rigidity pile body in the stratum to the inter-pile soil layer, does not need the imposed load thing; This device has pump drainage underground water and vacuumizes in the stratum function can force to reduce the water content of soft layer between stake fast and produce negative pressure in the stratum; By precompressed and precipitation effect to the inter-pile soil layer, inter-pile soil intensity is improved and the bearing capacity increase, the bearing capacity that the raising of inter-pile soil intensity can be converted into stake again improves, and this complementary effect is greatly improved the rigid pile composite foundation bearing capacity.
2. a kind of " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method " according to claim 1.The invention is characterized in the precompressed of the resistance to plucking masterpiece counter-force enforcement of utilization " from anchor loading vacuum-dewatering rigid pile body device " in the stratum to the inter-pile soil layer, promptly adopt: the load transfer pier (1) that in the stratum, is provided with, permeable concrete pipe (4), airtight concrete pipe (7), pull bar (5), counter-force roof beam structure (17), clamp nut (16), studdle (18), inner ring pressing plate (14), outer ring pressing plate (19) and the formed power transmission compression system of jack (20), come to make inter-pile soil closely knit to the inter-pile soil load application.
3. a kind of " from anchor vacuum densification rigid pile composite foundation comprehensive treatment method " according to claim 1.The invention is characterized in that " loading vacuum-dewatering rigid pile body device from anchor " has the function that vacuumizes precipitation, promptly adopts submersible pump (3) and gutter (11) (or other pump drainage water device) to put into pile body; On pile body pipe top sealing rubber pad (12), seal cover board (8), caulking gum nut (13), hold-down bolt (9) are installed, are made sealing in the pile body pipe; Vaccum-pumping equipment (15) is connected on the vacuum pumping hole (6), so that pump drainage underground water and aspiration vacuum.
4. according to claim 2,3 described a kind of " from anchor vacuum densification rigid pile composite foundation comprehensive treatment methods ".After the invention is characterized in that ground is handled, pull bar (5), submersible pump (3), gutter (11) and ground all facility can be removed recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03153625 CN1584220A (en) | 2003-08-18 | 2003-08-18 | Composite foundation comprehensive treatment with self anchored vacuum compact rigid piles |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03153625 CN1584220A (en) | 2003-08-18 | 2003-08-18 | Composite foundation comprehensive treatment with self anchored vacuum compact rigid piles |
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| CN1584220A true CN1584220A (en) | 2005-02-23 |
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| CN 03153625 Pending CN1584220A (en) | 2003-08-18 | 2003-08-18 | Composite foundation comprehensive treatment with self anchored vacuum compact rigid piles |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342087C (en) * | 2005-10-09 | 2007-10-10 | 南京工业大学 | Multi-point stress vibroflotation combined compaction method |
| CN100359100C (en) * | 2005-12-29 | 2008-01-02 | 徐士龙 | Method for treating soft foundition by fast 'high vacuum impacting dense, pile base' compound method |
| CN101806055B (en) * | 2009-02-13 | 2011-09-21 | 梁闽 | Vacuum pre-pressed joint rigid pile composite foundation reinforcing method |
| CN105887795A (en) * | 2016-06-07 | 2016-08-24 | 浙江大学 | Abutment back soft soil foundation gradual-change pile length counterforce loading prepressing method |
| CN106087945A (en) * | 2016-06-07 | 2016-11-09 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
| CN106120701A (en) * | 2016-08-23 | 2016-11-16 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN112593612A (en) * | 2020-11-19 | 2021-04-02 | 浙江二十冶建设有限公司 | Existing building peripheral precipitation method |
| CN116464028A (en) * | 2023-02-03 | 2023-07-21 | 西南石油大学 | Device and method for treating soft foundation by combining microwaves and pressure |
-
2003
- 2003-08-18 CN CN 03153625 patent/CN1584220A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342087C (en) * | 2005-10-09 | 2007-10-10 | 南京工业大学 | Multi-point stress vibroflotation combined compaction method |
| CN100359100C (en) * | 2005-12-29 | 2008-01-02 | 徐士龙 | Method for treating soft foundition by fast 'high vacuum impacting dense, pile base' compound method |
| CN101806055B (en) * | 2009-02-13 | 2011-09-21 | 梁闽 | Vacuum pre-pressed joint rigid pile composite foundation reinforcing method |
| CN105887795B (en) * | 2016-06-07 | 2018-05-01 | 浙江大学 | The long counter-force loading preloading method of Abutment Back soft soil foundation gradual change stake |
| CN106087945A (en) * | 2016-06-07 | 2016-11-09 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
| CN105887795A (en) * | 2016-06-07 | 2016-08-24 | 浙江大学 | Abutment back soft soil foundation gradual-change pile length counterforce loading prepressing method |
| CN106087945B (en) * | 2016-06-07 | 2018-07-31 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
| CN106120701A (en) * | 2016-08-23 | 2016-11-16 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN106120701B (en) * | 2016-08-23 | 2018-10-09 | 河海大学 | Prepressing structure and method for Perioperative cardiac events blowing-filling sludge epeirogenetic |
| CN112593612A (en) * | 2020-11-19 | 2021-04-02 | 浙江二十冶建设有限公司 | Existing building peripheral precipitation method |
| CN112593612B (en) * | 2020-11-19 | 2022-04-12 | 浙江二十冶建设有限公司 | Existing building peripheral precipitation method |
| CN116464028A (en) * | 2023-02-03 | 2023-07-21 | 西南石油大学 | Device and method for treating soft foundation by combining microwaves and pressure |
| CN116464028B (en) * | 2023-02-03 | 2023-09-05 | 西南石油大学 | Device and method for treating soft foundation by combining microwaves and pressure |
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