CN205593991U - High pressure is slurry shield excavation face mud film forming and sludge -biofilm air tightness testing device down - Google Patents

High pressure is slurry shield excavation face mud film forming and sludge -biofilm air tightness testing device down Download PDF

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Publication number
CN205593991U
CN205593991U CN201620339560.4U CN201620339560U CN205593991U CN 205593991 U CN205593991 U CN 205593991U CN 201620339560 U CN201620339560 U CN 201620339560U CN 205593991 U CN205593991 U CN 205593991U
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pressure
mud film
mud
air
film forming
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朱伟
张宁
闵凡路
前勇进
杜瑞
徐静波
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Hohai University HHU
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Hohai University HHU
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Abstract

The utility model discloses a high pressure is slurry shield excavation face mud film forming and sludge -biofilm air tightness testing device down, including the atmospheric pressure source, place mud infiltration room, back pressure device and water -collection device in the thermostated container, mud infiltration room is a steel model section of thick bamboo structure, through the bolt fastening on the base, be equipped with the recess on the base, from the bottom up lays porous copper, steel screen cloth and geotechnological cloth in proper order in the recess, and the base side is equipped with the drain valve, barrel top cap and perisporium pass through bolted connection, are equipped with inlet port and injected hole on it, and the intake pipe of mud infiltration room through passing the inlet port is connected with an output in atmospheric pressure source, water -collection device is a double glazing pipe, and its bottom is equipped with the drain valve, with the drain valve of base side through arranging water piping connection, its top is passed through the back pressure device and is connected with another output in atmospheric pressure source. The utility model discloses the device is simple feasible, through indoor experiment in to slurry shield excavation face the process of osmosis of mud in the stratum simulate, test sludge -biofilm's quality, the maximum pressure that the device can bear is 2.5MPa.

Description

Slurry shield excavation face mud film forming and mud film test device for air tightness under high pressure
Technical field:
The utility model relates to slurry shield excavation face mud film forming and mud film air tightness test tester under high pressure, belong to underground engineering field.
Background technology:
Along with China's exploitation to the underground space, slurry shield technology, petroleum drilling technology and drilling hole bored concrete pile technology are widely applied, one of common feature of these several technology is the mud film needing mud surface of stratum to form one layer of compactness, and supporting excavation face is to ensure that engineering safely performs smoothly.Due to continuing to increase of the underground space development degree of depth, requirement to mud quality of forming film is more and more higher, owing to engineering buried depth is big, complex geologic conditions, the quality of forming film of mud is tested the most uneconomical by field investigation and sampling, there is also bigger safety problem, the problems such as explosion easily occur under big pressure;How to be simulated becoming the topic that numerous engineering staffs pay close attention to the quality of mud film forming under different buried depth and different geological conditions.
By the geological environment of laboratory test model engineering position, carry out into film test, be estimated advantageously ensuring that engineering safety, carrying out efficiently to the mud intending using.The pressure environment that existing assay device can be simulated is maximum at about 0.7MPa, and this can not meet the demand of Practical Project.
Utility model content
Utility model purpose: for problems of the prior art, the utility model proposes slurry shield excavation face mud film forming and mud film test device for air tightness under high pressure, the process of osmosis in the earth formation of mud in slurry shield excavation face, oil drilling and cast-in-situ bored pile can be simulated by this device, can be with the process of approximate simulation mud film forming in the earth formation, the quality of mud film is tested simultaneously, the maximum pressure that this device can bear is 2.5MPa, is mud film forming and the test bubble-tight device of mud film under the lab simulation condition of high voltage of simple possible.
Technical scheme: the utility model proposes slurry shield excavation face mud film forming and mud film test device for air tightness under a kind of high pressure, including pneumatic supply, regulator, the slurry penetration room, backpressure device and the captation that are positioned in calorstat, described pneumatic supply includes air filter, air compressor, gas drive supercharger and the gas bomb being sequentially connected with, remove dust and the air of steam, compressed, by gas drive gas booster, high pressure gas storage is stored in steel cylinder again, the pressure of 0-2.0MPa is provided for infiltration room by air inlet;Described slurry penetration room is steel die type tube structure, is bolted on base, cylinder body bottom side be provided with side opening, for being vented above mud film the mud of remaining;Base is provided with groove, lay porous copper coin, steel screen cloth and geotextiles the most successively, drainage channel when functioning as slurry penetration of porous copper coin, steel screen cloth is as the backing material of geotextiles, the effect of geotextiles is the filter medium of mud, its type can be provided with drain valve according to slip unrestricted choice, base side;Top cover of cylinder body is bolted with perisporium, which is provided with air inlet and injected hole, and slurry penetration room is by being connected through the air inlet pipe of air inlet and regulator with an outfan of gas bomb;Described captation is a double-layer glass tube, drain valve it is provided with bottom double-layer glass tube, it is connected by drain pipe with the drain valve of slurry penetration room base side, the moisture that collection slurry penetration and mud film ooze out during holding one's breath, double-layer glass tube top is connected with another outfan of gas bomb by backpressure device, provides back-pressure for slurry penetration room;Described regulator includes that air inlet pressure regulator valve and boost gauge, described backpressure device include back-pressure regulation valve and back-pressure Pressure gauge.
Further, described gas drive supercharger ratio is 1:15.
Further, a diameter of 12cm of described steel die type tube, height is 15cm, and wall thickness is 1.2cm, and the maximum pressure that can resist is 2.5MPa.
Further, described slurry penetration room model cylinder is connected with base by 6 bolts, has rubber blanket for sealing between base and barrel.
Further, described base is the cuboid of 20cm × 20cm × 10cm, and the degree of depth of described groove is 2cm, is interconnected between the described each hole of porous copper coin, and its aperture is about 0.5cm, and the aperture of described steel screen cloth is at about 0.1mm.
Further, described air inlet pipe passes through an isothermal gas cabinet, air inlet pipe coiled coil in isothermal gas cabinet, can control stability when gas enters.
Further, described air inlet is connected by swivel bolt with air inlet pipe, it is simple to unpicking and washing of pressure chamber.
Further, screw thread, slip casting is had can be sealed by injected hole with bolt after terminating in described injected hole.
Further, the inner tube range of described double-layer glass tube is 200ml, and exterior tube range is 500ml, can be discharged by the drain valve of bottom during water no to scale in captation, and the maximum pressure that captation can be resisted is 2.0MPa.
Further, described air inlet pipe, drain pipe all make of the copper pipe that internal diameter is 3mm.
Under above-mentioned high pressure, slurry shield excavation face mud film forming and the method for testing of mud film test device for air tightness, comprise the steps:
A) geotextiles using equivalence substitutes stratum: determined the geotextiles type of selection by stratum effective aperture;
B) above geotextiles, test slurries is inserted: sealed slurry penetration room, and porous copper coin is the most saturated with geotextiles, in slurry penetration room, the mud of certain mass is injected with funnel;
C) mud is made to permeate to stratum (geotextiles of equivalence) direction by gas pressure to pressure slurry: to open the intake valve above slurry penetration room and the drain valve being joined directly together with slurry penetration room, set osmotic pressure during slurry penetration and back-pressure respectively by regulator and backpressure device;
D) whole slurry penetration room is placed in calorstat, sets the temperature of slurry penetration indoor gas, carries out the permeability test of mud;
E) measuring mud film quality: after certain time of penetration, mud forms one layer of fine and close mud film at Geotextile, the change of drainage amount during record slurry penetration;
F) show when drainage amount is stablized that the mud in slurry penetration room is completely formed mud film, measure the thickness of mud film, moisture content;
G) Air-tight Test: by the mud of remaining above side opening emptying mud film, hold one's breath pressure and the back-pressure of mud film is set by regulator and backpressure device, the Air-tight Test of mud film is carried out by gas pressurized, record the mud membrane filtration water yield, thickness, the change of moisture content during holding one's breath, observe the form of mud film simultaneously.
Further, described step a) determines the type of geotextiles by the aperture on stratum, shield machine place so that the hatch bore diameter AOS of geotextiles and median pore diameter D on stratum50It is close.
Further, in described step b), mud is the mud that shield machine is intended that when opening the cabin, and the weight of mud is 1000g.
Further, in described step c), osmotic pressure during slurry penetration and back-pressure determine according to the pressure of cutter head center position when shield machine driving or shutdown maintenance.
Further, in described step d), the temperature range of slurry penetration room is 10-60 DEG C, identical with the temperature of shield machine present position.
Further, in described step e), drainage amount during slurry penetration is read by the collector pipe on panel;Certain time sets according to the mud film formation time in concrete engineering.
Further, in described step f), mud drainage amount stably refers to the unit interval, the drainage amount of mud is less than 0.1ml/cm3/ min, this value determines according to the mud selected by test, geotextiles;The thickness of mud film, measurement of water-content coefficient are carried out after being taken out by mud film after needing off-test.
Further, force value when mud film is held one's breath in described step g) determines according to cutter head of shield machine center;Mud film form is mainly the failure mode of mud film.
Beneficial effect: this utility model provide device be simple possible lab simulation condition of high voltage under mud film forming and test the bubble-tight device of mud film, the process of osmosis in the earth formation of mud in slurry shield excavation face can be simulated by laboratory test, the quality of mud film is tested simultaneously, device can realize maximum pressure and reach the mud film forming of 2.5MPa and hold one's breath with mud film, and method of testing involved by this utility model is simple, workload is little, the shortest.
Accompanying drawing explanation
Fig. 1 is slurry penetration principle schematic of the present utility model;
Fig. 2 is base 1-1 profile of the present utility model;
Fig. 3 is collector pipe 2-2 profile of the present utility model.
Detailed description of the invention
Below in conjunction with specific embodiment, it is further elucidated with this utility model, it should be understood that these embodiments are merely to illustrate this utility model rather than limit scope of the present utility model, after having read this utility model, those skilled in the art all fall within the application claims limited range to the amendment of the various equivalent form of values of the present utility model.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technical term and scientific terminology) have with the those of ordinary skill in this utility model art be commonly understood by identical meaning.Should also be understood that those terms defined in such as general dictionary should be understood that have the meaning consistent with the meaning in the context of prior art, and unless defined as here, will not explain by idealization or the most formal implication.
The implication of the "and/or" described in this utility model refers to respective individualism or both simultaneous situations are included in interior.
The implication of " inside and outside " described in this utility model refers to relative to equipment itself, and the direction within sensing equipment is interior, otherwise is outward.
When the implication of " left and right " described in this utility model refers to reader just to accompanying drawing, the left side of reader is a left side, and the right of reader is the right side.
The implication of " connection " described in this utility model can be being directly connected between parts can also be by being indirectly connected with of other parts between parts.
Slurry shield excavation face mud film forming and mud film test device for air tightness under high pressure as Figure 1-3, including pneumatic supply 1, regulator, the slurry penetration room 7 being positioned in calorstat 8, backpressure device and captation 10, described pneumatic supply includes air filter 2, air compressor 3, gas drive supercharger 4 and the gas bomb 5 being sequentially connected with, and described gas drive supercharger 4 ratio is 1:15;Described slurry penetration room 7 is steel die type tube structure, its a diameter of 12cm, and height is 15cm, and wall thickness is 1.2cm, and cylinder body bottom side is provided with side opening, and described cylinder body bottom is connected with base 9 by 6 bolts, has rubber blanket between base 9 and barrel;Described base 9 is the cuboid of 20cm × 20cm × 10cm, base 9 is provided with groove, the degree of depth of described groove is 2cm, lay porous copper coin, steel screen cloth and geotextiles the most successively, it is interconnected between the described each hole of porous copper coin, its aperture is 0.5cm, and the aperture of described steel screen cloth is provided with drain pipe in 0.1mm, base 9 side;Top cover of cylinder body is bolted with perisporium, which is provided with air inlet 5 and injected hole 6, slurry penetration room is by being connected through the air inlet pipe of air inlet 5 with an outfan of gas bomb 5, described air inlet 5 is connected by swivel bolt with air inlet pipe, air inlet pipe is coiled coil structure, with bolt, injected hole 6 can be sealed after having screw thread, slip casting to terminate in injected hole 6;Described captation 10 is a double-layer glass tube, its inner tube range is 200ml, exterior tube range is 500ml, and bottom double-layer glass tube 10, the drain pipe with base 9 side, slurry penetration room is connected, and double-layer glass tube top is connected with another outfan of gas bomb 5 by backpressure device;Described regulator includes air inlet pressure regulator valve 11 and boost gauge 12, and described backpressure device includes back-pressure regulation valve 13 and back-pressure Pressure gauge 14.The air inlet pipe of this device, drain pipe all make of the copper pipe that internal diameter is 3mm.
Under above-mentioned high pressure, slurry shield excavation face mud film forming and the method for testing of mud film test device for air tightness, comprise the steps:
A) geotextiles using equivalence substitutes stratum: determined the geotextiles type of selection by stratum effective aperture, concrete: the type of described geotextiles is determined by the aperture on stratum, shield machine place so that the hatch bore diameter AOS of geotextiles and median pore diameter D on stratum50It is close.
B) above geotextiles, test slurries is inserted: sealed slurry penetration room, and porous copper coin is the most saturated with geotextiles, in slurry penetration room, the mud of certain mass is injected with funnel, concrete: the mud used is the mud that shield machine is intended that when opening the cabin, and the weight of mud is 1000g.
C) mud is made to permeate to stratum (geotextiles of equivalence) direction by gas pressure to pressure slurry: to open the intake valve above slurry penetration room and the drain valve being joined directly together with slurry penetration room; osmotic pressure during slurry penetration and back-pressure is set respectively by regulator and backpressure device; carry out the permeability test of mud, concrete: osmotic pressure and back-pressure during described slurry penetration determine according to the pressure of cutter head center position when shield machine driving or shutdown maintenance.
D) whole slurry penetration room is placed in calorstat, set the temperature of slurry penetration indoor gas, carry out the permeability test of mud, concrete: the temperature range of slurry penetration room is 10-60 DEG C, temperature according to shield machine present position determines, identical with the temperature of shield machine present position.
E) mud film quality is measured: after certain time of penetration, mud forms one layer of fine and close mud film at Geotextile, the change of drainage amount during record slurry penetration, concrete: drainage amount during described slurry penetration is read by the collector pipe on panel, and certain time sets according to the mud film formation time in concrete engineering.
F) show that when drainage amount is stablized the mud in slurry penetration room is completely formed mud film, the thickness of mud film, moisture content can be measured, concrete: described mud drainage amount stably refers to that the drainage amount of mud is less than less than 0.1ml/cm in the unit interval3/ min, this value determines according to the mud selected by test, geotextiles;The thickness of mud film, measurement of water-content coefficient are carried out after being taken out by mud film after needing off-test.
G) Air-tight Test: by the mud of remaining above side opening emptying mud film, hold one's breath pressure and the back-pressure of mud film is set by regulator and backpressure device, the Air-tight Test of mud film is carried out by gas pressurized, record the mud membrane filtration water yield, thickness, the change of moisture content during holding one's breath, observe the form of mud film simultaneously, concrete: force value when described mud film is held one's breath determines according to cutter head of shield machine center;Mud film form is mainly the failure mode of mud film.

Claims (10)

1. slurry shield excavation face mud film forming and a mud film test device for air tightness under high pressure, its feature exists In: include pneumatic supply, regulator, the slurry penetration room being positioned in calorstat, backpressure device and the dress that catchments Putting, described pneumatic supply includes air filter, air compressor, gas drive supercharger and the gas bomb being sequentially connected with; Described slurry penetration room is steel die type tube structure, is bolted on base, setting of cylinder body bottom side There is side opening;Base is provided with groove, lays porous copper coin, steel screen cloth and soil the most successively Work cloth, base side is provided with drain valve;Top cover of cylinder body is bolted with perisporium, which is provided with air inlet and Injected hole, slurry penetration room is by an outfan through the air inlet pipe of air inlet and regulator with gas bomb Connect;Described captation is a double-layer glass tube, is provided with drain valve bottom double-layer glass tube, itself and mud The drain valve of infiltration room base side is connected by drain pipe, and backpressure device and gas storage are passed through in double-layer glass tube top Another outfan of bottle connects;Described regulator includes air inlet pressure regulator valve and boost gauge, and described back-pressure fills Put and include back-pressure regulation valve and back-pressure Pressure gauge.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described gas drive supercharger ratio is 1:15.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: a diameter of 12cm of described steel die type tube, height is 15cm, wall thickness For 1.2cm.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described slurry penetration room model cylinder is connected with base by 6 bolts, base and Rubber blanket is had between barrel.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described base is the cuboid of 20cm × 20cm × 10cm, described groove deep Degree is 2cm, is interconnected between the described each hole of porous copper coin, and its aperture is 0.5cm, the hole of described steel screen cloth Footpath is at 0.1mm.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described air inlet pipe passes through an isothermal gas cabinet, air inlet pipe in isothermal gas cabinet Coiled coil.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described air inlet is connected by swivel bolt with air inlet pipe.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: there is screw thread in described injected hole.
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: the inner tube range of described double-layer glass tube is 200ml, and exterior tube range is 500ml。
Under high pressure the most according to claim 1, slurry shield excavation face mud film forming and mud film air-tightness are surveyed Electricity testing device, it is characterised in that: described air inlet pipe, drain pipe all make of the copper pipe that internal diameter is 3mm.
CN201620339560.4U 2016-04-21 2016-04-21 High pressure is slurry shield excavation face mud film forming and sludge -biofilm air tightness testing device down Active CN205593991U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105866337A (en) * 2016-04-21 2016-08-17 河海大学 Device and method for testing slurry shield excavation surface mud film formation and mud film air tightness under high pressure
CN107254879A (en) * 2017-07-01 2017-10-17 温州振华建设有限公司 A kind of construction foundation dredging and construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105866337A (en) * 2016-04-21 2016-08-17 河海大学 Device and method for testing slurry shield excavation surface mud film formation and mud film air tightness under high pressure
CN107254879A (en) * 2017-07-01 2017-10-17 温州振华建设有限公司 A kind of construction foundation dredging and construction method

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