CN105672241A - Device and method for treating deep seismic subsidence loess by combination of loess breakage by air injection and loess squeezing by air bag - Google Patents

Abstract

The invention discloses a device and method for treating deep seismic subsidence loess by combination of loess breakage by air injection and loess squeezing by an air bag. The device comprises an extensible double-layered steel sleeve, a top driver, an air distributing joint, a sand inlet, an air injection plug, the rubber air bag, a single-lobe non-return sand blasting opening and an adjustable gate valve, and is externally connected with an air compressor, a dry spraying machine and a lifting appliance. The method comprises the following steps: placing a device for breaking loess by air injection in seismic subsidence loess; synchronously injecting high-pressure air at a plurality of points to break macropore aerial structures of the loess; then expanding the air bag to squeeze the loose loess; releasing air in the air bag step by step after the loess is compact; refilling a hole by high-pressure sand filling; and repeating the steps piecewise so as to achieve the purpose of eliminating seismic subsidence of foundation loess finally. A process of loess breakage and a process of loess squeezing are finished continuously at a time, and the device and method are easy and convenient to operate and efficient. Moreover, owing to a water-free construction environment, possible secondary destruction caused by collapsibility of the loess meeting water is avoided, and the device and method are suitable for deep seismic subsidence loess foundations.

Description

Jet associating air bag soil compaction of breaking ground processes the device and method that deep shake falls into property loess

Technical field

The present invention relates to a kind of jet associating air bag soil compaction of breaking ground and process the device and method that deep shake falls into property loess, belong to method for processing foundation and device field.

Background technology

In China, the most of region residing for loess belongs to the multiple district of macroseism. Under middle action of strong earthquake, loess easily produces the ground disasters such as shake falls into, liquefaction. So-called seismic subsidence of loess refers to that loess aerial construction under the travelling load effects such as earthquake is subsided inefficacy, and volume significantly shrinks and causes the character of ground depression. Metastable structure containing built on stilts hole is the major cause that loess produces that shake falls into property. Under gravity, the powder of composition loess produces sedimentation and contacts with each other, but is enough to affect action of gravity due to the reactive force between particle, and the stop of some particles is on initial point of contact, and is not in more stable position. These powders are interconnected, and define the macrovoid " aerial construction " of weak cementing and open arrangement, cause shearing resistance much smaller than its compressive strength. Under travelling load effect, shearing stress is delivered to hole from loess skeleton thus causes shear fracture, produces power vulnerability. The buildings on property loess foundation is fallen in shake for building, if basement process is improper, serious consequences such as very easily occurring under earthquake action, sink, ftracture, collapse, so, it is necessary in engineering construction, the process of this kind of Special soil is paid close attention.

Fall into the feature of property loess macrovoid, low degree of compactness for shake, mainly adopt the method for processing foundation such as power concretion method, compaction pile method, replacement cushion method, grouting and reinforcing method and consolidation at present. The principal feature of these methods has: 1. power concretion method: be also called heavy-tamping method, namely utilizes weight to be rammed by ground, is applicable to the soil body processed in middle-shallow layer depth range, to the compacted limited efficiency having deep soil. 2. grouting and reinforcing method: hardening slurry is injected shake by high-tension apparatus and falls into property loess foundation, fill its hole and gap, and spread by slurries, solidify, improve soil body physico-mechanical properties. The method cost is higher, the more difficult control of grout coordinate ratio, it is easy to running pulp leakage slurry phenomenon occurs, causes waste and the environmental pollution of material. 3. compaction pile method: to vibrate, to impact or the method such as band sleeve pipe becomes hole, then in hole, insert sand, stone, dirt, lime or other materials, become, in addition jolt ramming, the closely knit stake body that diameter is bigger, and and stake week formed composite foundation by solid soil, jointly support built-loading. Elimination shake is fallen into property and has certain effect by compaction pile method, but in failing to eliminate, the shake of loess falls into property under action of strong earthquake. 4. replacement cushion method: be the shake under substrate is fallen into property loess formation all dig out, and replace the treatment process of artificial soil removal and replacement bed course as buildings bearing stratum. Mainly for the treatment of the shallow layer foundation that building load is little, deep layer shake cannot be replaced and fall into property loess.

Can not effectively process deep shake based on current method for processing foundation and fall into property this present situation of loess, the traffic micro-simulation that the present invention falls into property loess from shake is started with, by the mode of Multipoint synchronous high-pressure jet, macrovoid, the weak structure of loess is destroyed, eliminates the sunken property harm of shake that soil body aerial construction causes.Simultaneously, the lower end of device arrange inflating rubber air bag can effectively compacted break ground after loose earth, and be aided with high-pressure sand blast fill space, it is to increase the overall degree of compactness of the soil body, and the shake finally eliminating loess foundation falls into property, reach the object improving bearing capacity of foundation soil and ensureing superstructure safety.

Summary of the invention

It is desirable to provide a kind of jet associating air bag soil compaction of breaking ground processes the device and method that deep shake falls into property loess.

The present invention provides a kind of jet associating air bag soil compaction of breaking ground and processes the device that deep shake falls into property loess, comprise Clad Steel sleeve pipe, Clad Steel sleeve pipe is positioned at boring, and Clad Steel sleeve pipe is made up of outer tube and inner core pipe, and described outer tube and core pipe are threaded connection by some pipe nipples respectively and form; Cannula tip is that top is driven, and top is driven top and is provided with sand inlet and air distribution connector, and air distribution connector comprises outer tube air distribution connector and core pipe air distribution connector; Sand inlet is connected with dry spraying machine by blast tube, and air distribution connector is by the hose connection air compressor of high-pressure jet; Described core pipe is steel single spraying tracheae, is connected with the core pipe air distribution connector of top, and outer tube is dry sand and jet joint channel, and outer tube is connected with sand inlet, the jet joint of outer tube of top; It is tubaeform be connected with outer tube bottom core pipe, outer pipe bottom is provided with rubber-bag, the gas orifice that outer segment is provided with core pipe communicates of rubber-bag parcel, air compressor carries out high-pressure aerated by core pipe to rubber-bag, above rubber-bag, the left and right sides is evenly distributed with jet vent plug and single-lobe non-return sand jet outlet, it is provided with gate valve inside outer tube, is controlled jet vent plug and the opening and closing of single-lobe non-return sand jet outlet by gate valve; Top is driven and is connected with lifting gear.

In said apparatus, the diameter of described core pipe is 10mm, and the diameter of outer tube is 70mm, and the length of described pipe nipple equals the soil thickness of staging treating.

In said apparatus, holding the left and right sides respectively to establish 2-3 jet vent plug and a single-lobe non-return sand jet outlet respectively under outer tube, valve stops the circulation of sand in sand or soil backflow blocking pipe, and jet vent plug is arranged on above sand jet outlet; The lower end of sand jet outlet is rubber-bag, and in steel pipe rubber-bag cuff section, both sides are vertically arranged with 4-5 gas orifice, and the spacing of gas orifice is 20-40mm; The diameter of single-lobe non-return sand jet outlet is 30mm, and jet vent plug mouth and gas orifice diameter are 5mm.

In said apparatus, according to residing soil depth and soil body soft or hard degree, being controlled by the air pressure in rubber-bag chamber at 10-1000kPa, air pressure in outer lumen, namely the jet air pressure that breaks ground, controls at 0.5-5MPa.

In said apparatus, described rubber-bag cuff section is provided with the groove of 4-5mm, do not give prominence to after rubber-bag is fastening, with to prevent in air bag decentralization process by hole wall friction and damage, and in gasbag outer surface bonding two layers of plastic thin films, prevent sleeve shell material to be attached to balloon surface, affect its expansion character; After rubber-bag is inflated, in ellipsoid cylindricality, stretching, extension diameter is 0.1-1.0m, and length is 1.0m-5m.

In said apparatus, described gate valve is made up of handwheel, flashboard, valve rod, screw rod, and valve plate and handwheel are connected by screw rod, is provided with flashboard bottom gate valve, and flashboard is welded on the bottom of valve rod, and the contact internal walls of flashboard and outer tube. By rotating handwheel, the advance and retreat of control threaded stem, the lifting of band ovable valve stem bottom flashboard and decline, it is achieved the opening and closing conversion of sand jet outlet and jet vent plug.

In said apparatus, described high-pressure jet flexible pipe is provided with valve. Described lifting gear is the little machine that hangs of building, combines by electric motor, speed reduction unit, clutch coupling, stopper, rope cylinder and wireline.

The present invention provides a kind of jet associating air bag soil compaction of breaking ground and processes the method that deep shake falls into property loess, adopts said apparatus, comprises the following steps:

1) smooth location soil surface, removes all grounds, underground obstacle, exclusively area water in place, and paving builds shoofly, to lay machinery;

2) driller insertion, by the boring of spacing 4-5m quincuncial arrangement on described ground, aperture is 100-150mm; With straightening frame tappet in boring procedure, to good stake position, machine and creep into, it is unearthed, the high-quality thin mud retaining wall that in hole, injection modulates in advance, sleeve shell material, to designing the degree of depth, is pumped at the bottom of hole by drilling rod pump by boring, pours into sleeve shell material from bottom to top to the virgin pulp liquid that aperture spilling meets concentration requirement;

3) propose boring device, steel pipe device is transferred in each boring simultaneously, in air bag outsourcing two layers of plastic thin films before transferring, in case sleeve shell material and inflating rubber balloon contacts, affect the expansion character of air bag; Each boring is put into a casing bit, at the bottom of its arrival hole, bottom, and makes each boring middle sleeve length as far as possible identical, finally pour into closed sleeve shell material, filling orifice inside clearance in aperture;

4) sleeve shell material maintenance is after 5-7 days, can carry out construction of breaking ground; Open air compressor, close the air pressure valve connecting core pipe, open the air pressure valve connecting outer tube, adjustable pressure, and be stabilized in design load, by the handwheel decline flashboard rotated on the manual veneer gate valve of dark bar, close sand jet outlet, open jet vent plug mouth; Unlatching top is driven, and makes rotation limit, casing bit limit spray into high pressure gas by jet vent plug, breaks through sleeve shell material, cutting soil; Meanwhile, utilizing lifting gear slowly to be promoted by the sleeve pipe of rotation, the height once promoted is not more than the length of rubber-bag;

5), after sleeve lift puts in place, close top and drive and outer tube air pressure valve, open core pipe air pressure valve, inflated in rubber-bag by gas orifice so that it is inflation, the loose earth after compacted cutting;

6) expanding after lasting 2-3min, slowly bleed and air bag volume is reduced gradually, open dry spraying machine simultaneously, rotation hand wheel opens single-lobe non-return sand jet outlet, sprays into thin dry sand, fills the space that deflated balloon stays; Again make airbag inflation afterwards, the compacted sand inserted, this inflation-fill out sand process circulation 2 ~ 3 times, to reach best densification effect;

7) complete a joint section fill out sand compacted after, next joint section is repeated above three construction procedures, until processing whole soil thickness, after each joint section has processed, pulled down the sleeve pipe stretching out ground by threaded connector, then connect be furnished with top drive and gas, sand joint sleeve pipe, continuation process;

In the vicinity four arranged in blossom type is holed, Multipoint synchronous is carried out jet during concrete operation, namely each hole inner sleeve remains at same depth place, and adopt identical pulling speed and jet air pressure, realization acts in agreement, to slow down the rate of decay of high pressure gas in the soil body, it is to increase the effect of breaking ground in process range.

The present invention'sUseful effect:

(1) the present invention destroys the macrovoid aerial construction of loess by high-pressure jet, and combine airbag inflation solid soil, recharge dry sand simultaneously and fill space, degree of compactness and the bearing capacity of original loess foundation will be significantly improved, eliminating its shake and fall into property, under avoiding earthquake action, macroporous structure destroys and causes ground depression;

(2) fall into the constructional method of property compared to other process shakes, the present invention increases the treating depth of loess foundation, and it is simple and easy convenient to construct, and avoids dig on a wide area and possible environmental pollution, and with low cost, obvious economic;

(3) the present invention will break ground and complete with soil compaction two process one-time continuous, easy and simple to handle, efficient; Meanwhile, anhydrous construction environment avoids loess and meets the man-made further destroy that may cause of water saturated yielding, is applicable to strong rammer, changes and fill out and deep shake that the ordinary method such as compacted stake cannot process falls into property loess foundation.

Accompanying drawing explanation

Fig. 1 is the structural representation of apparatus of the present invention.

Fig. 2 is the sectional view of the lower end of Fig. 1.

Fig. 3 is sectional view along line A-A in Fig. 2.

Fig. 4 is the structural representation of gate valve.

Fig. 5 is boring layout schematic diagram.

Fig. 6 is the construction procedure schematic diagram adopting apparatus of the present invention process shake to fall into property loess foundation.

In figure: 1 is outer tube, 2 is core pipe, and 3 for driving on top, and 4 is sand inlet, 5 is outer tube air distribution connector, and 6 is core pipe air distribution connector, and 7 is air compressor, and 8 is dry spraying machine, 9 is blast tube, and 10 is high-pressure jet flexible pipe, and 11 is jet vent plug, and 12 is single-lobe non-return sand jet outlet, 13 is rubber-bag, and 14 is gas orifice, and 15 is sleeve shell material, 16 is gate valve, and 17 is screw rod, and 18 is valve rod, 19 is flashboard, and 20 is handwheel, and 21 is lifting apparatus. 1. it is and 2. gas and the sandblasting passage of breaking ground, 3. it is airbag aeration gas passage.

Embodiment

Below by embodiment, the present invention is described further, but it is not limited to following examples.

Embodiment 1:

As shown in Fig. 1 ~ 3, a kind of jet associating air bag soil compaction of breaking ground processes the device that deep shake falls into property loess, comprise Clad Steel sleeve pipe, Clad Steel sleeve pipe is positioned at boring, Clad Steel sleeve pipe is made up of outer tube 1 and inner core pipe 2, and described outer tube 1 and core pipe 2 are threaded connection by some pipe nipples respectively and form; Cannula tip is that top drives 3, and top is driven and is provided with sand inlet 4 and air distribution connector above in the of 3, and air distribution connector comprises outer tube air distribution connector 5 and core pipe air distribution connector 6; Sand inlet 4 is connected with dry spraying machine 8 by blast tube 9, and air distribution connector connects air compressor 7 by high-pressure jet flexible pipe 10; Described core pipe 2 is steel single spraying tracheae, is connected with the core pipe air distribution connector 6 of top, and outer tube 1 is dry sand and jet joint channel, and outer tube 1 is connected with sand inlet 4, the jet joint 5 of outer tube of top; It is connected with outer tube 1 for tubaeform bottom core pipe 2, rubber-bag 13 it is provided with bottom outer tube 1, the outer segment that rubber-bag 13 wraps up is provided with the gas orifice 14 communicated with core pipe, air compressor 7 carries out high-pressure aerated by core pipe 2 to rubber-bag 13, above rubber-bag 13, the left and right sides is evenly distributed with jet vent plug 11 and single-lobe non-return sand jet outlet 12, it is provided with gate valve 16 inside outer tube 1, is controlled jet vent plug 11 and the opening and closing of single-lobe non-return sand jet outlet 12 by gate valve 16; Top is driven 3 and is connected with lifting gear 21.

Further, described lifting gear is the little machine that hangs of building, combines by electric motor, speed reduction unit, clutch coupling, stopper, rope cylinder and wireline.

Further, the diameter of described core pipe is 10mm, and the diameter of outer tube is 70mm, and the length of described pipe nipple equals the soil thickness of staging treating.

Further, holding the left and right sides respectively to establish 3 jet vent plugs and a single-lobe non-return sand jet outlet respectively under outer tube, jet vent plug is arranged on above sand jet outlet; The lower end of sand jet outlet is rubber-bag, and in steel pipe rubber-bag cuff section, both sides are vertically arranged with 4 gas orifices, and the distance between the upper and lower of gas orifice is 20-40mm; The diameter of single-lobe non-return sand jet outlet is 30mm, and jet vent plug mouth and gas orifice diameter are 5mm.

Further, according to residing soil depth and soil body soft or hard degree, being controlled by the air pressure in rubber-bag chamber at 10-1000kPa, air pressure in outer lumen, namely the jet air pressure that breaks ground, controls at 0.5-5MPa.

Further, described rubber-bag cuff section is provided with the groove of 4-5mm, does not give prominence to after rubber-bag is fastening, with to prevent in air bag decentralization process by hole wall friction and damage, and in gasbag outer surface bonding two layers of plastic thin films, prevent sleeve shell material to be attached to balloon surface, affect its expansion character;After rubber-bag is inflated, in ellipsoid cylindricality, stretching, extension diameter is 0.1-1.0m, and length is 1.0m-5m.

Further, described high-pressure jet flexible pipe is provided with valve.

As shown in Figure 4, described gate valve 16 is made up of handwheel 20, flashboard 19, valve rod 18, screw rod 17, and valve rod 18 and handwheel 20 are connected by screw rod 17, are provided with flashboard 19 bottom gate valve 16, and flashboard 19 is welded on the bottom of valve rod 18, and the contact internal walls of flashboard 19 and outer tube. By rotating handwheel, the advance and retreat of control threaded stem, the lifting of band ovable valve stem bottom flashboard and decline, it is achieved the opening and closing conversion of sand jet outlet and jet vent plug.

Fig. 5 is borehole pattern, and the diamond-shaped area that process 4 boring contacts every time, after process, moves in parallel machinery and device to the right, process subsequent region successively.

Fig. 6 is that the present invention falls into the construction procedure schematic diagram of property loess foundation for the treatment of shake. Wherein 6-1 is boring; 6-2 is for filling with sleeve shell material after boring; 6-3, for putting into Steel Sleeve device, treats that sleeve shell material is solidified; 6-4, for rotating and upgrading device, jet breaks ground; 6-5 is rubber-bag inflation solid soil; 6-6 is sandblasting filling space after extruding.

The jet associating air bag soil compaction of breaking ground of the present embodiment is reinforced the sunken property loess foundation constructional method of shake and is comprised the following steps:

1) surface, smooth Ground Treatment place, removes all grounds, underground obstacle, exclusively area water in place, and paving builds shoofly etc., so that the laying of machinery.

2) driller insertion, as Fig. 5 as described on ground by the boring of spacing 4-5m quincuncial arrangement (four borings form diamond structure), aperture is 100mm, with straightening frame tappet in boring procedure, if Fig. 6-1 is to good stake position (using contraposition circle), machine and creep into, it is unearthed, the high-quality thin mud retaining wall that in hole, injection modulates in advance, as in fig. 6-2, boring is to designing the degree of depth (the loess thickness that need to process adds cuff segment length), sleeve shell material is pumped at the bottom of hole by drilling rod pump, pour into sleeve shell material from bottom to top to the virgin pulp liquid that aperture spilling meets concentration requirement.

3) as shown in Fig. 6-3, it is proposed to boring device, steel pipe device is transferred in hole, in air bag outsourcing two layers of plastic thin films before lower section, in case sleeve shell material and inflating rubber balloon contacts, affects the expansion character of air bag. Each boring is put into a casing bit, at the bottom of its arrival hole, bottom, and makes each boring middle sleeve length as far as possible identical, finally pour into closed sleeve shell material, filling orifice inside clearance in aperture.

4) sleeve shell material maintenance is after 5-7 days, reaches certain intensity, it is possible to carry out construction of breaking ground.

5) open air compressor, close the air pressure valve connecting core pipe, open the air pressure valve connecting outer tube, adjustable pressure, and be stabilized in design load, open top simultaneously and drive. As shown in Fig. 6-4, rotation limit, sleeve pipe limit sprays into high pressure gas by jet vent plug, breaks through sleeve shell material, cutting soil. Utilizing lifting apparatus slowly to be promoted by the sleeve pipe of rotation, the height once promoted is balloon segment length simultaneously.

6) after sleeve lift puts in place, closing top and drive and outer tube air pressure valve, open core pipe air pressure valve, as shown in Fig. 6-5, inflated by gas orifice so that it is inflation in rubber-bag, extrusion soil makes it closely knit.

7) after expansion continues 2-3min, slowly bleed and air bag volume is reduced gradually, in deflated balloon process, open dry spraying machine, rotation hand wheel opens single-lobe non-return sand jet outlet, as shown in Fig. 6-6, spray into thin dry sand, fill the space that deflated balloon stays, again make airbag inflation afterwards, the compacted sand inserted, this inflation-fill out sand process circulation 2 ~ 3 times, to reach optimum handling effect.

Complete a joint section fill out sand compacted after, next joint section is repeated above 5)-7) three construction procedures, until the process of whole soil thickness is complete. Each joint after section process, can pull down the casing section stretching out ground, connect be furnished with top drive and gas, sand joint sleeve pipe, continuation process. Multipoint synchronous can be carried out in the vicinity four arranged in blossom type is holed jet during concrete operation, namely each hole inner sleeve remains at same depth place, and adopt identical pulling speed and jet air pressure, realization acts in agreement, to slow down the rate of decay of high pressure gas in the soil body, it is to increase the effect of breaking ground in process range.

Claims (9)

1. a jet associating air bag soil compaction of breaking ground processes the device that deep shake falls into property loess, it is characterized in that: comprise Clad Steel sleeve pipe, Clad Steel sleeve pipe is positioned at boring, and Clad Steel sleeve pipe is made up of outer tube and inner core pipe, and described outer tube and core pipe are threaded connection by some pipe nipples respectively and form; Cannula tip is that top is driven, and top is driven top and is provided with sand inlet and air distribution connector, and air distribution connector comprises outer tube air distribution connector and core pipe air distribution connector; Sand inlet is connected with dry spraying machine by blast tube, and air distribution connector is by the hose connection air compressor of high-pressure jet; Described core pipe is steel single spraying tracheae, is connected with the core pipe air distribution connector of top, and outer tube is dry sand and jet joint channel, and outer tube is connected with sand inlet, the jet joint of outer tube of top; It is tubaeform be connected with outer tube bottom core pipe, outer pipe bottom is provided with rubber-bag, the gas orifice that outer segment is provided with core pipe communicates of rubber-bag parcel, air compressor carries out high-pressure aerated by core pipe in rubber-bag, above rubber-bag, the left and right sides is evenly distributed with jet vent plug and single-lobe non-return sand jet outlet, it is provided with gate valve inside outer tube, is controlled jet vent plug and the opening and closing of single-lobe non-return sand jet outlet by gate valve; Top is driven and is connected with lifting gear.

2. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterised in that: the diameter of described core pipe is 10mm, and the diameter of outer tube is 70mm, and the length of described pipe nipple equals the soil thickness of staging treating.

3. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterized in that: holding the left and right sides respectively to establish 2-3 jet vent plug and a single-lobe non-return sand jet outlet respectively under outer tube, jet vent plug is arranged on above sand jet outlet; The lower end of sand jet outlet is rubber-bag, and in steel pipe rubber-bag cuff section, both sides are vertically arranged with 4-5 gas orifice, and the spacing of gas orifice is 20-40mm; The diameter of single-lobe non-return sand jet outlet is 30mm, and jet vent plug mouth and gas orifice diameter are 5mm.

4. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterized in that: according to residing soil depth and soil body soft or hard degree, air pressure in rubber-bag chamber is controlled at 10-1000kPa, air pressure in outer lumen, namely the jet air pressure that breaks ground, controls at 0.5-5MPa.

5. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterized in that: described rubber-bag cuff section is provided with the groove of 4-5mm, do not give prominence to after rubber-bag is fastening, and in gasbag outer surface bonding two layers of plastic thin films, after rubber-bag is inflated, in ellipsoid cylindricality, stretching, extension diameter is 0.1-1.0m, and length is 1.0m-5m.

6. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterized in that: described gate valve is made up of handwheel, flashboard, valve rod, screw rod, valve plate and handwheel are connected by screw rod, flashboard it is provided with bottom gate valve, flashboard is welded on the bottom of valve rod, and the contact internal walls of flashboard and outer tube.

7. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterised in that: described high-pressure jet flexible pipe is provided with valve.

8. jet associating air bag soil compaction of breaking ground according to claim 1 processes the device that deep shake falls into property loess, it is characterised in that: described lifting gear is the little machine that hangs of building, combines by electric motor, speed reduction unit, clutch coupling, stopper, rope cylinder and wireline.

9. jet associating air bag soil compaction of breaking ground processes the method that deep shake falls into property loess, adopts the device described in the arbitrary item of claim 1 ~ 8, it is characterised in that:

1) smooth location soil surface, removes all grounds, underground obstacle, exclusively area water in place, and paving builds shoofly, to lay machinery;

2) driller insertion, by the boring of spacing 4-5m quincuncial arrangement on described ground, aperture is 100-150mm; With straightening frame tappet in boring procedure, to good stake position, machine and creep into, it is unearthed, the high-quality thin mud retaining wall that in hole, injection modulates in advance, sleeve shell material, to designing the degree of depth, is pumped at the bottom of hole by drilling rod pump by boring, pours into sleeve shell material from bottom to top to the virgin pulp liquid that aperture spilling meets concentration requirement;

3) propose boring device, steel pipe device is transferred in each boring simultaneously, in air bag outsourcing two layers of plastic thin films before transferring, in case sleeve shell material and inflating rubber balloon contacts, affect the expansion character of air bag; Each boring is put into a casing bit, at the bottom of its arrival hole, bottom, and makes each boring middle sleeve length as far as possible identical, finally pour into closed sleeve shell material, filling orifice inside clearance in aperture;

4) sleeve shell material maintenance is after 5-7 days, can carry out construction of breaking ground; Open air compressor, close the air pressure valve connecting core pipe, open the air pressure valve connecting outer tube, adjustable pressure, and be stabilized in design load, by the handwheel decline flashboard rotated on the manual veneer gate valve of dark bar, close sand jet outlet, open jet vent plug mouth; Unlatching top is driven, and makes rotation limit, casing bit limit spray into high pressure gas by jet vent plug, breaks through sleeve shell material, cutting soil; Meanwhile, utilizing lifting gear slowly to be promoted by the sleeve pipe of rotation, the height once promoted should be not more than the length of rubber-bag;

5), after sleeve lift puts in place, close top and drive and outer tube air pressure valve, open core pipe air pressure valve, inflated in rubber-bag by gas orifice so that it is inflation, the loose earth after compacted cutting;

6) expanding after lasting 2-3min, slowly bleed and air bag volume is reduced gradually, open dry spraying machine simultaneously, rotation hand wheel opens single-lobe non-return sand jet outlet, sprays into thin dry sand, fills the space that deflated balloon stays; Again make airbag inflation afterwards, the compacted sand inserted, this inflation-fill out sand process circulation 2 ~ 3 times, to reach best densification effect;

7) complete a joint section fill out sand compacted after, next joint section is repeated above three construction procedures, until processing whole soil thickness, after each joint section has processed, pulled down the sleeve pipe stretching out ground by threaded connector, then connect be furnished with top drive and gas, sand joint sleeve pipe, continuation process;

In the vicinity four arranged in blossom type is holed, Multipoint synchronous is carried out jet during concrete operation, namely each hole inner sleeve remains at same depth place, and adopt identical pulling speed and jet air pressure, realization acts in agreement, to slow down the rate of decay of high pressure gas in the soil body, it is to increase the effect of breaking ground in process range.