CN1566539A - Self-anchoring vacuum compaction method - Google Patents
Self-anchoring vacuum compaction method Download PDFInfo
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- CN1566539A CN1566539A CN 03140599 CN03140599A CN1566539A CN 1566539 A CN1566539 A CN 1566539A CN 03140599 CN03140599 CN 03140599 CN 03140599 A CN03140599 A CN 03140599A CN 1566539 A CN1566539 A CN 1566539A
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Abstract
The invention relates to a foundation treatment method by drainage fastening. Said method strikes 'self anchorage loading vacuum precipitation plant' in soft soil foundation, the plant takes anchoring upright resistance as counterforce to exert precompression on ground layer, needless of additional load and bedding sand; while the plant also has vacuum pumping and precipitation functions, can rapidly and forcedly reduce water content of difficult ground, and produce negative pressure in ground layer. Through the precompression and precipitation functions of said plant, the intensity of treated soil mass is improved; the well point pipe and tie bar embedded in ground layer by the plant can be extracted for reutilization after foundation treatment. The invention has short construction period, higher bearing capacity after treatment and low construction costs, is adapted to treat difficult clayey soil with poor permeability.
Description
The present invention relates to a kind of method for processing foundation.Consolidation method for processing foundation particularly.
Traditional consolidation foundation treatment method is that sand drain (or band drain) adds preloading, this is a kind of effective ways of soft ground treatment, importing China into from the fifties just is used widely, use till today, but that this method exists is long in time limit, cost is high, need the problem of a large amount of preloading material always.The domestic in the last few years new method of having developed some consolidation grounds processing successively, representational is three kinds of methods: 1. vacuum precompression consolidating method of soft soil foundation (publication number 85108820, classification number E02D3/10), it adds preloading than sand drain and saves cost and time, but this method is handled back bearing capacity not high (about 80kPa); 2. vacuum-dewatering combined stack-load method for pre-pressing and reinforcing soft earth foundation (publication number 1191256, classification number E02D3/10), it adds preloading than sand drain and saves preloading material and time, but cost is still higher, and the duration is still longer, still needs a large amount of preloading material; 3. quick " High vacuum compacting method " soft foundation processing method (publication number CN1330189A, classification number E02D3/046), it is shorter than other consolidation construction period, bearing capacity is also high, cost is also low, but its processing degree of depth is limited, is not suitable for the weak viscous soil horizon of bad hydraulic permeability.
The object of the present invention is to provide a kind of duration short, bearing capacity is high, need not a large amount of preloading material, be fit to the lower method for processing foundation of weak viscous soil horizon, cost of poor permeability.
The invention is characterized in: in the stratum that needs are handled, set a kind of " loading the vacuum-dewatering device " (seeing figure one: load vacuum-dewatering device schematic diagram) from anchor from anchor, this device is to utilize the precompressed of its anchoring resistance to plucking masterpiece counter-force enforcement in the stratum to the stratum, does not need the imposed load thing; This device also has the function that vacuumizes precipitation concurrently in the stratum, can force fast to reduce the water content of soft layer and produce negative pressure in the stratum, shortens the ground treatment construction phase greatly; This device is imbedded the well point pipe and the pull bar on stratum all can extract recycling after ground is handled, save goods and materials and reduce cost.
Technical scheme of the present invention is such: a kind of " from anchor vacuum densification method " ground treatment construction method.This method is to set " loading the vacuum-dewatering device from anchor " in the stratum, this device is provided with stake point (1) and is connected the pull bar (5) that can transmit uplift force, the resistance to plucking resistance that utilization stake point (1) and vertical drainage body (3) (sand or aggregate chips) form is as counter-force, with the precompressed of jack (17) enforcement to the stratum; This device can be filtered the underground water that collects in the stratum in vertical drainage body (3), vertical drainage body (3) but in be provided with and not only can protect for convenience detach but also phreatic well point pipe of pump drainage (4) of pull bar, pipe (4) top, well point is connected pump drainage underground water and aspiration vacuum in the stratum with vaccum-pumping equipment (14); This device mainly contains 4 effects: 1. can apply prefabricating load to the stratum from anchor loading effect, need not the preloading material; 2. vacuumize precipitation and force acceleration mesopore, stratum water to manage seepage flow (also can be aided with electroosmosis method in case of necessity), change the water content of the processed soil body to the well point; 3. vacuumize precipitation and in the stratum, form negative pressure, form the part prefabricating load; 4. vacuumize precipitation groundwater table is reduced, the effective stress increase also can form the part prefabricating load in the soil body.By of precipitation and the precompressed effect of this device, the water content of the processed soil body is reduced and the compactness raising to the stratum.After precipitating, pre-pressing finished, the pull bar (5) in this device, well point pipe (4) can be extracted recycling; After extracting pull bar, well point pipe, for by the position, hole of disturbance, the stake pipe of available bottom end seal is aimed at the foramen primum position, opens vibration hammer and pressurization, jolt-squeezes the stratum under the foramen primum position closely knit; Peripheral for pressing plate (6) not by the shallow topsoil of densification, stake machine vibration hammer can be installed a block pressur plate down, utilize the power that impulses of vibration hammer and pressure they to be jolt-squeezed closely knit.
" loading the vacuum-dewatering device from anchor " is to work like this: pull bar (5) is enclosed within the well point pipe (4), the pull bar (5) of slinging places it in the stake pipe of a machine, and connect on the embedded nut (2) of stake point (1), mode with immersed tube sets stake point and stake pipe in the stratum, in the stake pipe, pour into a certain amount of sand or rubble, aggregate chips etc. as vertical drainage body (3), extract the stake pipe then; Vertical drainage body (3) top is covered with the cohesive soil (18) that seals to the face of land, place pressing plate (6) at the earthing end face; Pipe top in well point is connected with the suction arm (12) that vacuumizes usefulness on threeway and the ground, by suction main (13) and vacuum pump (14) pump drainage underground water and aspiration vacuum; The mouth of pipe is stopped up with the rubber seal tapered cup nut (7) that is spun on the pull bar (5) in pipe (4) top, well point, and top compresses sealing with clamp nut (9); Pull bar (5) top is connected with reaction beam (15), and with locking nut (16) locking, to transmit the resistance to plucking counter-force, jack (17) is gone up top reaction beam (15) and pressed down pressing plate (6), applies prefabricating load to the stratum; Pressurizing frame (8) presses down pressing plate (6), on use locking nut (11) locking so that also continue to pressing plate (6) power transmission after withdrawing from jack (17).After ground is handled, also the pull bar in the stratum (5) can be moved back from embedded nut (2) and unload the recycling of proposition ground, well point pipe (4) also available stake machine or crane are extracted recycling.
The requirement of " from anchor loading vacuum-dewatering device " critical piece is such: stake point (1) is a precast unit, and also available iron is made, and its size and intensity should be determined according to the maximum uplift resistance of strata condition and estimation; Vertical drainage body (3) should determine to pour into height according to strata condition, and its principle is for guaranteeing to go up earthing (18) energy sealed air-tight, and the materials of water discharging body can be determined with sand (must be medium coarse sand), aggregate chips or rubble according to the local resources situation; Well point pipe (4) is a steel pipe, also available plastic pipe (in the place that does not need with electroosmosis method), chimney filter is processed into for about 1.5 meters in its bottom, outsourcing geotechnique's filter cloth or filter screen etc., tube and tube must seal when connecting, the thickness of pipe must satisfy the displacement requirement, and intensity must satisfy the tensile strength requirement when extracting the stratum; Pull bar (5) is better with smart bundle indented bars, and this kind reinforcing bar need not processed the spiral shell button, and nut and reinforcing bar connector all have the finished product supply, and is economical convenient, can select the specifications and models of reinforcing bar according to the requirement of uplift resistance; Vacuum pump (14) select for use jetting type or diaphragm type all can, every pump with the well point number can not surpass the ability of pump, vacuum pump and suction main junction should adorn non retern valve in case power failure or equipment fault and lose negative pressure; Suction arm (12) should be adorned stop valve with the junction of suction main (13) so that install and maintenance; The available concrete for making of pressing plate (6), also can make of steel plate, the density of the big I base area layer situation of pressing plate (6) and device layout is comprehensively determined, generally should satisfy two adjacent platen edge crosses more than the soft layer end face for good mutually at underground stress angle of flare oblique line, the height of pressing plate (6) should consider that pressing plate is pressed into underground and can conveniently proposes required height, and the structure of pressing plate (6) should design according to stressing conditions; Reaction beam (15) is processed with steel plate, and structure should design according to maximum uplift force; Jack (17) configuration should be satisfied the requirement that maximum uplift force is provided, and simultaneously gauge table should be arranged, accurately the control loaded amount.Pressurizing frame (8) is processed with steel plate, and its structure should be able to satisfy the maximum pressure of support to pressing plate; Rubber seal tapered cup nut (7) in use should often be checked its sealing situation, leaks air to screw and to tighten pressurizing nut (9) immediately, guarantees vacuum in the pipe of well point.
Using the present invention to carry out ground handles, its design can be carried out with reference to figure two (design flow diagram), should be specifically noted that during designing and calculating: the resistance to plucking anchored force of allowing of " loading the vacuum-dewatering device from anchor " is not constant, it is circulation and rises, promptly install to the processed soil body and vacuumize precipitation and loading, processed soil solidifying degree is increased and the intensity raising, make the resistance to plucking anchored force of allowing of device become big conversely, so move in circles and make the uplift resistance of allowing of device constantly become big, constantly, ground is handled reached designing requirement the ground load application.
The present invention and sand drain add the preloading comparison duration short, cost is low, need not preloading material and sand cushion; Compare the bearing capacity height with vacuum method; Short with the vacuum-dewatering combined stack-load method comparison duration, cost is low, need not the preloading material; Big with the High vacuum compacting method comparison process degree of depth, as to be fit to poor permeability viscous soil horizon.
Embodiment: somewhere one steel oil storage tank battery engineering, the design load of foundation bed is 220kPa under jar, the natural ground situation sees the following form 1
Table 1 is the geological mapping data in detail
| Layer sequence number | Title | State | Average thickness | Natural moisture content % | The severe of soil | Natural void ratio | Liquid limit | Plastic limit | Angle of internal friction | Modulus of compressibility MPA | Characteristic value of foundation bearing capacity | Collateral resistance KPA | End resistance MPA |
| ????(1) | Clay silt | Close slightly | ????2.5 | ????35.6 | ????17.8 | ????1.010 | ????33.9 | ????25.1 | ????26.4 | ????9.08 | ????90 | ????22 | |
| ????(2) | Mud matter silty clay folder flour sand | Stream is moulded | ????1.24 | ????38.6 | ????17.6 | ????1.093 | ????33.8 | ????21.4 | ????6.3 | ????3.32 | ????85 | ????22 | ????1.0 |
| ????(3) | Mud matter silty clay | Stream is moulded | ????4.0 | ????44.0 | ????18.0 | ????1.270 | ????38 | ????22.9 | ????4.1 | ????2.7 | ????75 | ????8 | |
| ????(4) | Clay silt | Plastic | ????1.4 | ????18.5 | ????4.66 | ????160 | ????46 | ????1.7 |
The strata condition of reflection from table 1, natural ground can not satisfy the requirement of bearing capacity, must carry out ground and handle.The Technological Economy that ground is handled adoptable method and the whole bag of tricks relatively sees the following form 2
The various method for processing foundation of the single 32 rice diameter oil tanks of table 2 relatively
| Sequence number | Method for processing foundation | Bearing capacity (Kpa) before handling | Handle the degree of depth (m) | Construction period (my god) | Handle back bearing capacity (Kpa) | Cost (ten thousand yuan) | Subject matter |
| 1 | Band drain adds piling prepressing | 90 | 11 | 200 | 220 | 64 | Long in time limit, the cost height needs a large amount of preloading materials. |
| 2 | Vacuum preloading | 90 | 11 | 140 | Do not satisfy | It is not high that this method is handled the back bearing capacity. | |
| 3 | The vacuum-dewatering combined stack-load | 90 | 11 | 120 | 220 | 43 | Duration is still longer, and cost is still higher, still needs a large amount of preloading material. |
| 4 | High vacuum compacting method | 90 | Do not satisfy | The processing degree of depth is limited, is not suitable for the weak cohesive soil of poor permeability. | |||
| 5 | From anchor vacuum densification method | 90 | 11 | 50 | 220 | 24 | Should not use in the place of closing on existing intensive building. |
| 6 | Immersed tube bored concrete pile | 90 | 11 | 50 | 220 | 61 | Easily make earth heaving, undergauge, cost height |
| 7 | CFG | 90 | 11 | 45 | 220 | 32 | Easily make earth heaving, broken pile, undergauge. |
| 8 | Cement mixing method | 90 | 11 | 50 | 220 | 54 | Need a large amount of cement, cost is higher. |
As can be seen from Table 2: the present invention not only relatively has a clear superiority in conventional method and three kinds of new methods of consolidation, more also has a clear superiority in other method for processing foundation.
Construction of the present invention gets final product with common heavy tube drawing stake machine, and the processing of device feature is simple, and materials are common material, is convenient to promote.
Claims (5)
1. one kind " from anchor vacuum densification method " ground treatment construction method.The invention is characterized in that employing " loads the vacuum-dewatering device from anchor ", this device has the function that the resistance to plucking counter-force is provided, utilize the precompressed of its anchoring resistance to plucking masterpiece counter-force enforcement in the stratum to the stratum, this device has and vacuumizes and the function of precipitation, forces to reduce the water content of the processed soil body and produce negative pressure in the stratum; The intensity that precompressed and drainage by this device makes the processed soil body improves.
2. a kind of " from anchor vacuum densification method " according to claim 1 ground treatment construction method.The invention is characterized in the precompressed of the anchoring resistance to plucking masterpiece counter-force enforcement of utilization " from anchor loading vacuum-dewatering device " in the stratum to the stratum, promptly adopt: stake point (1), the embedded nut (2), pull bar (5), reaction beam (15), pressurizing frame (8), locking nut (9), jack (17), increased pressure board (6), the formed power transmission compression system that in the stratum, are provided with, come to make the soil body closely knit to the stratum load application.
3. a kind of " from anchor vacuum densification method " according to claim 1 ground treatment construction method, feature of the present invention is that " loading the vacuum-dewatering device from anchor " has the function that vacuumizes precipitation, promptly adopt pull bar pillar double as well point pipe (4), pipe top, well point is connected pump drainage underground water and aspiration vacuum by threeway with suction arm (12), suction main (13), vacuum pump (14), and ferrule is stopped up with the rubber seal tapered cup nut (7) that is spun on the pull bar (5) in pipe top, well point.
4. according to claim 2,3 described a kind of " vacuum-dewatering densification method " ground treatment construction method, after the invention is characterized in that ground is handled, can move back to unload from embedded nut (2) and propose the ground recycling imbedding pull bar (5) in the stratum, well point pipe (4) also available stake machine or crane be extracted recycling.
5. according to claim 3,4 described a kind of " from anchor vacuum densification method " ground treatment construction method, the invention is characterized in pull bar (5) and well point pipe (4) proposed from the stratum after, the pressing plate that available stake machine vibration hammer is installed down is outer not by the close compacting of shaking of the shallow topsoil of densification with foramen primum position and pressing plate.
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| CN 03140599 CN1566539A (en) | 2003-06-12 | 2003-06-12 | Self-anchoring vacuum compaction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100497840C (en) * | 2007-07-16 | 2009-06-10 | 叶吉 | Compound reinforcing method for large-area soft ground |
| CN105178289A (en) * | 2015-10-10 | 2015-12-23 | 江西建工第二建筑有限责任公司 | Prefabricated downcast pipe pile in building foundation pit and use method thereof |
| CN106087945A (en) * | 2016-06-07 | 2016-11-09 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
-
2003
- 2003-06-12 CN CN 03140599 patent/CN1566539A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100497840C (en) * | 2007-07-16 | 2009-06-10 | 叶吉 | Compound reinforcing method for large-area soft ground |
| CN105178289A (en) * | 2015-10-10 | 2015-12-23 | 江西建工第二建筑有限责任公司 | Prefabricated downcast pipe pile in building foundation pit and use method thereof |
| CN105178289B (en) * | 2015-10-10 | 2017-10-31 | 江西建工第二建筑有限责任公司 | Precast dewatering pile tube and its application method in building foundation pit |
| CN106087945A (en) * | 2016-06-07 | 2016-11-09 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
| CN106087945B (en) * | 2016-06-07 | 2018-07-31 | 浙江大学 | Earth anchor and counter-force load precompressed soft foundation processing method |
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