CN104452736A - Intermittent vacuum precompression device and soft foundation treatment method of intermittent vacuum precompression device - Google Patents
Intermittent vacuum precompression device and soft foundation treatment method of intermittent vacuum precompression device Download PDFInfo
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- CN104452736A CN104452736A CN201410738396.XA CN201410738396A CN104452736A CN 104452736 A CN104452736 A CN 104452736A CN 201410738396 A CN201410738396 A CN 201410738396A CN 104452736 A CN104452736 A CN 104452736A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an intermittent vacuum precompression device and a soft foundation treatment method of the device. The intermittent vacuum precompression device comprises vertical drainage bodies (1), direct connecting joints (2) connected with the vertical drainage body (1), connecting pipes (3) connected with the direct connecting joints (2), discharge branches (4) connected with the connecting pipe (3), a drainage collector (5) connected with the discharge branches (4), a jet pump (6) connected with the drainage collector (5), and a valve (7) mounted between the drainage collector (5) and the jet pump (6). The device can delay aggregation of clay fine particles during drainage via short-period variation of a vacuum degree in an early drainage stage, alleviate clogging of the drainage bodies due to clay particle migration under the condition of applying a constant vacuum degree and therefore delay the clogging of a drainage pipeline and a neighbouring soil body. The device can solve the problem of too early clogging of a drainage channel due to soil material migration in the existing vacuum precompression process, and has an important application value.
Description
Technical field
The present invention is the vacuum prepressing device designing a kind of reinforcing soft soil, and particularly the vacuum prepressing device that automatically changes in time of a kind of vacuum and the method for carrying out treatment of soft foundation thereof, be applicable to ultra-soft soil draining and other similar engineerings that silting easily occurs.
Background technology
Along with the development of China's Tidal Flat Reclamation building cause, especially after China " 12 " planning outline proposes to advance marine economy development, the requirement for border on the sea land-based area area and development rate must promote, and wherein enclose and cultivate is one of major measure with making.Marine shoal is enclosed and cultivated most of barged-in fill used and is had that water content is high, intensity is low and the feature such as poor permeability, so must make corresponding basement process when enclosing and cultivating in land-based area and carrying out infrastructure.Meanwhile, the dredging works of China waterway and harbour basin, also brings the accumulation of a large amount of dredging silt, and how to reduce the moisture content of mud in stockyard fast, the storage mud amount expanding stockyard is also the practical problem faced at present.
What the soft-soil foundation treatment methods such as existing barged-in fill were the most conventional is vacuum method.This method arranges vertical plastic draining board at barged-in fill (sand), sanding bed course or horizontal drainage body thereon, diaphragm seal is adopted to close it again, and sand cushion or horizontal drainage body, vertical plastic draining board etc. are in partial vacuum under adopting jet pump to bleed to make film, discharge the part pore water in soil, accelerate soil solidifying, and then improve soil strength, reduce settlement after construction.Vacuum method, because being able to extensive use without the need to the advantage such as preloading filler, precompressed duration be shorter, becomes the method for processing foundation that in China and even world wide, the weak soil such as barged-in fill is commonly used the most.
For barged-in fill recently and yard sludge, vacuum method is adopted often to face the silting problem of anti-filter system.This is because the weak soils such as barged-in fill are underconsolidated soil because of it, not yet form stable grogs skeleton, applying the migration that soil particle easily occurs under external load function, as the phenomenon that soil particle moves will be produced in weak soil consolidation process under gravity downwards.In vacuum preloading process, after applying unified negative pressure by drainage channel to weak soils such as barged-in fills, soil particle can move toward water discharging body direction, forms fine and close soil (mud) layer, soil layer transmission coefficient around water discharging body is diminished, hinders follow-up prepressing water discharge process.Facts have proved, the silting phenomenon of the water discharging body surrounding soil that mostly occurs in weak soil vacuum preloading process, produce the phenomenons such as consolidation effect is uneven, later stage drainage effect difference, " native stake " the phenomenon most wherein adopting vacuum preloading process barged-in fill to produce is representative.
For tackling such bad condition, China's engineering circles is by the improvement to traditional vacuum preloading method, as the improvement to drainage channel, plate core, filter membrane and bonding mode thereof that major measure concentrates on plastic draining board improve, to postpone and alleviate silting occur time and degree; For the control of vacuum in vacuum preloading process, be existingly mainly ventilating vacuum silt prevention method, the anti-blocking vacuum method of superpressure etc.The former handling object mainly mud, and the quick water and soil separation need setting up that drainage pipeline networks carries out mud in advance, affect the hydraulic reclamation operation in stockyard; The latter realizes the increase of negative pressure by direct-discharging drainage channel structure and pressure inlet, but after hypotonicity mud layer is formed, acts on very unobvious under high negative pressure effect.
In sum, according to current actual conditions and technical condition, need a kind of intermittent vacuum water suction prepressing device of invention and preloading method thereof badly.Reach the silting time of postponing drainage pipe and the neighbouring soil body, improve vacuum preloading treatment effect, realize the silting blocking punishment effect under " the short period vacuum change " thinking in the weak soil draining initial stage.
Summary of the invention
Goal of the invention: the object of the invention is the many deficiencies in order to overcome prior art, a kind of intermittent vacuum prepressing device is provided and carries out the method for the treatment of of soft foundation, intermittent vacuum prepressing device provided by the invention is by the variation of short period to vacuum in the draining initial stage, postpone the gathering of clay fine grained in drainage procedure, alleviate because the soil particle applied under constant vacuum condition moves the silting causing water discharging body, thus postpone the silting time of drainage pipe and the neighbouring soil body, solve in existing vacuum preloading process because earth material moves the problem of the too early silting of drainage channel caused, achieve breakthrough technique effect.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of intermittent vacuum prepressing device, it comprises vertical drainage body, the direct-connected joint be connected with vertical drainage body, the tube connector be connected with direct-connected joint, the branch drain be connected with tube connector, the drain header be connected with branch drain, the jet pump be connected with drain header, is provided with valve between described drain header and jet pump.
Preferably, above-described intermittent vacuum prepressing device, described branch drain and drain header are equipped with 300g/m successively
2geotextiles and double-deck diaphragm seal.
Preferably, above-described intermittent vacuum prepressing device, described valve is electrically operated valve or operated pneumatic valve.
Preferably, above-described intermittent vacuum prepressing device, described electrically operated valve or operated pneumatic valve are waterproof high frequency valve, and Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
Preferably, above-described intermittent vacuum prepressing device, described jet pump comprises submersible pump and the ejector of 7.5kW.
Intermittent vacuum preloading provided by the invention carries out the method for the treatment of of soft foundation, and it comprises the following steps:
A, drainage channel connect: according to designing requirement, bury vertical drainage body underground, then direct-connected joint is connected with vertical drainage body, then tube connector is connected with direct-connected joint, and branch drain is connected on tube connector, then drain header is connected with branch drain, then connects jet pump in one end of drain header, and between drain header and jet pump mounted valve on pipeline;
The sealing of b, vacuum preloading is disposed: on branch drain and drain header horizontal pipe, lay the geotextiles of 300g/m2 and double-deck diaphragm seal successively, and press-in closes on sealing ditch, and the regional seal completing vacuum pre-pressed soft soil foundation is disposed;
C, turn on pump jet pump vacuumize precompressed, and by Valve controlling make the vacuum in drain header completed in 0 ~ 15 second 0 to 90kPa be mechanical periodicity, cycle 2T is 30 seconds;
D, after vacuum preloading 2 to 3 week, after pending Soil Body tends towards stability, shed valve, and proceed vacuum preloading until reach unloading requirement.
Preferably, above-described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, it is characterized in that, described valve is electrically operated valve or the operated pneumatic valve of waterproof high frequency; Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
Preferably, described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, and tube connector, branch drain and drain header are the tubing of PU pipe or other flexible tube walls not opening.
Preferably, described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, and tube connector can adopt external diameter 8mm, the PU tracheae of internal diameter 6mm connects, branch drain can adopt external diameter 8mm equally, and the PU tracheae of internal diameter 6mm connects, and tube connector and branch drain adopt three pneumatic joints to be connected.Drain header can adopt the PVC thin walled hose of the tube wall not diameter 50mm of opening.
Preferably, described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, and described vertical drainage body is plastic draining board, as domestic Type B plastic draining board.
Beneficial effect: intermittent vacuum prepressing device provided by the invention and carry out treatment of soft foundation method compared to the prior art tool have the following advantages:
1. intermittent vacuum prepressing device provided by the invention, reasonable in design, easy to operate, cost is low, easily implements, and significantly can alleviate the silting phenomenon in the empty pre-compaction process of weak soil, improve the soil solidifying degree after vacuum preloading.Due to the self-characteristic (soil body that especially stickiness content is more) of weak soil, adopt conventional method that the gathering of drainage channel and neighbouring stickiness grogs thereof can occur, cause the silting of drainage system, hinder the process of soil solidifying draining, affect duration of a project and treatment effect.After the present invention adopts intermittent vacuum preloading, regulated by the vacuum of draining initial stage to the water discharging body automatic short period, realize producing time dependent negative pressure in vertical drainage body, soil particle migration velocity in drainage procedure is reduced greatly, alleviate the silting phenomenon of weak soil in vacuum preloading process, postpone the silting time of drainage pipe.
2. the treatment effect of intermittent vacuum provided by the invention water suction preloading and uniformity better.Adopt intermittent vacuum preloading, more pore water can be discharged from the soil body, improve the average degree of consolidation of barged-in fill or mud etc.; Rapid aggregation simultaneously because avoiding water discharging body periphery to stick grain, the uniformity that after can realizing soil body process, soil strength strengthens.
Accompanying drawing explanation
Fig. 1 is the structural representation of intermittent vacuum prepressing device provided by the invention;
Fig. 2 is the structural representation in intermittent vacuum prepressing device cross section provided by the invention;
Fig. 3 be intermittent vacuum preloading of the present invention when carrying out treatment of soft foundation vacuum automatically regulate schematic diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Embodiment 1
As shown in Figure 1, a kind of intermittent vacuum prepressing device, it comprises vertical drainage body (1), the direct-connected joint (2) be connected with vertical drainage body (1), the tube connector (3) be connected with direct-connected joint (2), the branch drain (4) be connected with tube connector (3), the drain header (5) be connected with branch drain (4), the jet pump (6) be connected with drain header (5), is provided with valve (7) between described drain header (5) and jet pump (6).
Above-described intermittent vacuum prepressing device, described branch drain (4) and drain header (5) are equipped with 300g/m successively
2geotextiles (8) and double-deck diaphragm seal (9).
Above-described intermittent vacuum prepressing device, is characterized in that: the electrically operated valve that described valve (7) is waterproof high frequency or operated pneumatic valve.Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
Above-described intermittent vacuum prepressing device, described jet pump comprises submersible pump and the ejector of 7.5kW.
Above-described intermittent vacuum prepressing device, described vertical drainage body (1) is domestic Type B plastic draining board.
Embodiment 2
Intermittent vacuum preloading provided by the invention carries out the method for the treatment of of soft foundation, and it comprises the following steps:
A, drainage channel connect: according to designing requirement, bury vertical drainage body (1) underground, then direct-connected joint (2) is connected with vertical drainage body (1), then tube connector (3) is connected with direct-connected joint (2), and branch drain (4) is connected on tube connector (3), then drain header (5) is connected with branch drain (4), then connect jet pump (6) in one end of drain header (5), and between drain header (5) and jet pump (6) mounted valve (7) on pipeline;
The sealing of b, vacuum preloading is disposed: on branch drain (4) with drain header (5) horizontal pipe, lay 300g/m successively
2geotextiles (8) and double-deck diaphragm seal (9), and press-in closes on sealing ditch, and the regional seal completing vacuum pre-pressed soft soil foundation is disposed; As depicted in figs. 1 and 2,
C, turn on pump jet pump (6) vacuumize precompressed, and control to make the vacuum in drain header (5) in 0 ~ 15 second, complete 0 to 90kPa to be mechanical periodicity by valve (7), and cycle 2T is 30 seconds, as shown in Figure 3;
D, after vacuum preloading 2 to 3 week, after pending Soil Body tends towards stability, shed valve (7), and proceed vacuum preloading until reach unloading requirement.
Above-described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, the electrically operated valve that described valve (7) is waterproof high frequency or operated pneumatic valve; Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
Above-described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, it is characterized in that, tube connector (3), branch drain (4) and drain header (5) are the tubing of PU pipe or other flexible tube walls not opening.
Above-described intermittent vacuum preloading carries out the method for the treatment of of soft foundation, and the vertical drainage body (1) described in it is domestic Type B plastic draining board.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. an intermittent vacuum prepressing device, it is characterized in that: it comprises vertical drainage body (1), the direct-connected joint (2) be connected with vertical drainage body (1), the tube connector (3) be connected with direct-connected joint (2), the branch drain (4) be connected with tube connector (3), the drain header (5) be connected with branch drain (4), the jet pump (6) be connected with drain header (5), is provided with valve (7) between described drain header (5) and jet pump (6).
2. intermittent vacuum prepressing device according to claim 1, is characterized in that: described branch drain (4) and drain header (5) are equipped with geotextiles (8) and double-deck diaphragm seal (9) successively.
3. intermittent vacuum prepressing device according to claim 1, is characterized in that: described valve (7) is electrically operated valve or operated pneumatic valve.
4. intermittent vacuum prepressing device according to claim 2, is characterized in that: described electrically operated valve or operated pneumatic valve are waterproof high frequency valve, and Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
5. intermittent vacuum prepressing device according to claim 1, is characterized in that: described jet pump comprises submersible pump and the ejector of 7.5kW.
6. intermittent vacuum preloading carries out the method for the treatment of of soft foundation, it is characterized in that comprising the following steps:
A, drainage channel connect: according to designing requirement, bury vertical drainage body (1) underground, then direct-connected joint (2) is connected with vertical drainage body (1), then tube connector (3) is connected with direct-connected joint (2), and branch drain (4) is connected on tube connector (3), then drain header (5) is connected with branch drain (4), then connect jet pump (6) in one end of drain header (5), and between drain header (5) and jet pump (6) mounted valve (7) on pipeline;
The sealing of b, vacuum preloading is disposed: on branch drain (4) with drain header (5) horizontal pipe, lay 300g/m successively
2geotextiles (8) and double-deck diaphragm seal (9), and press-in closes on sealing ditch, and the regional seal completing vacuum pre-pressed soft soil foundation is disposed;
C, turn on pump jet pump (6) vacuumize precompressed, and control to make the vacuum in drain header (5) in 0 ~ 15 second, complete 0 to 90kPa to be mechanical periodicity by valve (7), and cycle 2T is 30 seconds;
D, after vacuum preloading 2 to 3 week, after pending Soil Body tends towards stability, shed valve (7), and proceed vacuum preloading until reach unloading requirement.
7. intermittent vacuum preloading according to claim 6 carries out the method for the treatment of of soft foundation, it is characterized in that, the electrically operated valve that described valve (7) is waterproof high frequency or operated pneumatic valve; Valve controlling frequency is 5 seconds ~ 60 seconds, and version is vacuum sinusoidal variations in time or pulse change.
8. intermittent vacuum preloading according to claim 6 carries out the method for the treatment of of soft foundation, it is characterized in that, tube connector (3), branch drain (4) and drain header (5) are the tubing of PU pipe or other flexible tube walls not opening.
9. intermittent vacuum preloading according to claim 6 carries out the method for the treatment of of soft foundation, it is characterized in that, described vertical drainage body (1) is plastic draining board.
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Cited By (6)
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|---|---|---|---|---|
| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
| CN105178284A (en) * | 2015-08-31 | 2015-12-23 | 上海交通大学 | Pulsation vacuum preloading drainage device and method of mucky soil soft foundation |
| CN105464070A (en) * | 2015-12-23 | 2016-04-06 | 江苏鸿基水利建设工程有限公司 | Device and method for consolidating deep and thick silted soil foundation through full-section high-vacuum preloading |
| CN106759237A (en) * | 2016-11-25 | 2017-05-31 | 天津大学 | A kind of vacuum preloading method of alternative expression pumping |
| CN108104104A (en) * | 2017-12-29 | 2018-06-01 | 浙江工业大学 | Method for reinforcing soft soil foundation through fluctuation pressurization type vacuum preloading |
| CN109056697A (en) * | 2018-09-28 | 2018-12-21 | 曾垭铭 | A method of vacuum preloading, which is solved, without horizontal direction in sand drainage blanket drains plugging |
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| CN108104104A (en) * | 2017-12-29 | 2018-06-01 | 浙江工业大学 | Method for reinforcing soft soil foundation through fluctuation pressurization type vacuum preloading |
| CN109056697A (en) * | 2018-09-28 | 2018-12-21 | 曾垭铭 | A method of vacuum preloading, which is solved, without horizontal direction in sand drainage blanket drains plugging |
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