CN113219156B - Air-extracting negative-pressure biological slurry filling device suitable for adhesive soil column and grouting method - Google Patents
Air-extracting negative-pressure biological slurry filling device suitable for adhesive soil column and grouting method Download PDFInfo
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Abstract
The invention discloses an air-extracting negative-pressure biological slurry filling device and method suitable for a viscous soil column, wherein the air-extracting negative-pressure biological slurry filling device comprises a grouting part and a sample preparation part, wherein the grouting part comprises a sealing top cover, a hollow floral tube, a double-layer sample cylinder, a side wall sealing latex sleeve, a metal chassis, a bottom sealing latex sleeve, a moisture sensor, a monitoring display, a sealing silica gel base, a water-gas separator, an air extracting pump and a liquid supply cylinder; the sample preparation part comprises a sample preparation base, a hoop and a double-layer sample cylinder, and the double-layer sample cylinder is a common part of the grouting part and the sample preparation part. Under the action of vacuum negative pressure, slurry flows from the center of the earth pillar to the periphery transversely through the hollow perforated pipe, the streamline is horizontal along the radial direction of the earth pillar, the flow field is simple, the uniformity of grouting is ensured, the problem of unevenness caused by the fact that the flow field in the sample cylinder is complex due to the effect of the air suction negative pressure on the bottom of the sample cylinder is solved, and the problems that grouting is difficult, grouting is uneven and the grouting amount is difficult to control quantitatively in the process of researching a viscous soil microorganism induced mineralization test are solved.
Description
Technical Field
The invention belongs to the field of microbial induced mineralization treatment of soil bodies, and particularly relates to a biological pulp filling device and method suitable for a viscous soil column.
Background
The method for treating heavy metal polluted soil and improving the physical and mechanical properties of soil by microorganism induced mineralization has become a current research hotspot as a new method for soil remediation or foundation treatment, and a plurality of scholars develop researches in related aspects at home and abroad. How to uniformly pour a fixed amount of bacterial liquid and cementing liquid into a soil body to enable the bacterial liquid and the cementing liquid to fully react so as to achieve the purpose of treating the soil body by microorganism induction and mineralization is a technical problem in the research field at present. At present, the most widely adopted method for grouting coarse-grained soil and sandy soil is a free infiltration method, and the effect is better. However, the free infiltration method has poor effect on cohesive soil and basically cannot infiltrate. At present, many scholars adopt a mixing method to fully mix bacterial liquid, cementing liquid and soil, but the method can disturb the in-situ soil and destroy the original structure of the soil, and the engineering quantity is large. Therefore, other methods are sought to achieve effective grouting of cohesive soil.
The existing methods for realizing the biological grouting test of the cohesive soil comprise an electroosmosis grouting method, a positive pressure grouting method and a negative pressure grouting method. The electroosmosis method is that a metal electrode is inserted into soil, direct current is applied, and liquid flows from an anode to a cathode under the action of an electric field, so that electroosmosis microorganism grouting of the soil body is realized. However, electroosmosis grouting easily causes electrode corrosion, so that slurry becomes turbid and microbial activity is influenced. In addition, positive pressure grouting is also used, but the grouting pressure is difficult to control. The pressure is small, the flow rate is reduced, and calcium carbonate crystals are easy to deposit in fine pores to form biological blockage; the pressure is big, slip casting speed is too high, can lead to more fungus liquid to be washed out, and calcium carbonate deposit reduces. And too high pressure can destroy the soil structure, makes the soil body produce the splitting crack, and the crack can be along with the going on constantly extending of grout and the fungus liquid can ooze along with the crack during grout, leads to the formation of difficult quantitative estimation carbonate in the soil body. The existing negative pressure grouting method mostly adopts one-way vacuum pumping at the bottom of a sample, grout is poured at the top or the side, when the soil sample is higher, the grout is difficult to be uniformly poured into the soil body by the method, and the condition that the upper part has too much effusion and the lower part is not fully filled is easily caused.
Disclosure of Invention
The invention aims to solve the problems that most of the existing grouting methods cannot realize in-situ grouting of a cohesive soil column or can realize in-situ grouting of the cohesive soil column but have poor effect, provides an air-extraction negative-pressure biological slurry grouting device and a grouting method suitable for the cohesive soil column, solves the problems that grouting is difficult, grouting is not uniform and the grouting amount is difficult to control quantitatively in the process of researching a microorganism induced mineralization test of the cohesive soil, and meets the requirement of microorganism induced mineralization treatment on the soil column.
The invention provides an air-extracting negative-pressure biological slurry filling device suitable for a viscous soil column, which comprises a grouting part and a sample preparation part, wherein the grouting part comprises a sealing top cover, a hollow floral tube, a double-layer sample cylinder, a side wall sealing latex sleeve, a metal chassis, a bottom sealing latex sleeve, a moisture sensor, a monitoring display, a sealing silica gel base, a water-gas separator, an air pump and a liquid supply cylinder; the sample preparation part comprises a sample preparation base, a hoop and a double-layer sample cylinder, and the double-layer sample cylinder is a common part of the grouting part and the sample preparation part;
the double-layer sample cylinder is in a double-layer cylindrical shape and consists of three one-third cylindrical petals, each petal consists of an inner layer of one-third cylinder and an outer layer of one-third cylinder, the tops of the inner layer of one-third cylinders and the tops of the outer layer of one-third cylinders are connected into a whole, the bottoms of the inner layer of one-third cylinders and the outer layer of one-third cylinders are separated, a gap is reserved between the inner layer of one-third cylinders and the outer layer of one-third cylinders, and a plurality of through holes are uniformly formed in the three one-third cylinders of the inner cylinder along the circumferential direction; the lower end of the hollow floral tube is closed and extends into the bottom of the double-layer sample tube, the top end of the hollow floral tube is communicated with a through hole arranged in the center of the sealing top cover and is fixed on the sealing top cover, and through holes are uniformly arranged on the wall of the hollow floral tube along the circumferential direction of the tube; the sealing top cover is matched with the outer diameter of the double-layer sample tube outer cylinder so as to seal the top of the double-layer sample tube; the outer diameter of the metal chassis is matched with the outer diameter of the inner cylinder of the double-layer sample cylinder so as to seal the bottom of the double-layer sample cylinder, the bottom sealing latex sleeve covers the metal chassis, and the edge of the bottom sealing latex sleeve wraps the joint of the edge of the inner cylinder of the double-layer sample cylinder and the metal chassis so as to seal the joint; the side wall sealing latex sleeve is matched with the double-layer sample cylinder, sleeved on the outer surface of the double-layer sample cylinder and wrapped at the joint of the sealing top cover and the double-layer sample cylinder to be sealed; the moisture sensor is fixedly arranged on the outer surface of the inner cylinder of the three-petal mold along the elevation and is connected with the monitoring display through a data line; the sealing silica gel base is provided with an internal concave cavity matched with the double-layer sample cylinder, a plurality of bosses are arranged at the bottom of the concave cavity, the lower part of the double-layer sample cylinder, a side wall sealing latex sleeve on the outer surface of the double-layer sample cylinder, a chassis and a bottom sealing latex sleeve are erected in the sealing silica gel base together and supported by the bosses, so that a gap is reserved between the metal chassis and the bottom of the concave cavity of the sealing silica gel base; the inlet of the water-gas separator is communicated with the gap inside the sealed silica gel base, and the outlet of the water-gas separator is communicated with the air suction pump; the liquid supply cylinder is communicated with a through hole arranged on the sealing top cover; the sample preparation base is provided with a cavity which is matched with the bottom of the double-layer sample cylinder and can accommodate the bottom of the double-layer sample cylinder, and the hoop is matched with the outer diameter of the double-layer sample cylinder and used for fixing the three-petal mold to form the double-layer sample cylinder in the sample preparation process.
Furthermore, the aperture of the through holes uniformly arranged in the circumferential direction of the hollow perforated pipe is 1-2 mm, the distance is 3-4 mm, two rows of adjacent through holes are vertically arranged in a staggered manner at the vertical height, the bottom of the hollow perforated pipe is sealed to form a cone, a soil body can be conveniently inserted into the cone, and the soil body can be prevented from entering the inner blocking channel of the perforated pipe. Under the action of air suction and negative pressure, the slurry can be sucked into the hollow floral tube, and the slurry in the floral tube can horizontally seep to the periphery through the small holes.
Furthermore, the length of the hollow floral tube meets the condition that after the double-layer sample cylinder is sealed by the sealing top cover, the tail end of the hollow floral tube extends to the metal chassis, and the straight line of the hollow floral tube coincides with the longitudinal axis of the center of the double-layer sample cylinder.
Furthermore, three moisture sensors are uniformly fixed at the upper, middle and lower positions of each flap mold along the elevation, and the moisture sensors on each flap mold are connected with the same monitoring display through data lines. The monitoring display is provided with three indicator lights which are respectively connected with an upper moisture sensor, a middle moisture sensor and a lower moisture sensor on the three-petal die, and the indicator lights on the display are turned on to indicate that liquid seepage is monitored at the position.
Further, be provided with the middle supporting piece of the outer lamella of connection and the inlayer lamella of reinforcing steadiness between the bottom inlayer of every lamella of double-deck sample section of thick bamboo and the skin. The middle supporting block is a certain distance away from the bottom edge of the flap mold, so that the bottom sealing latex sleeve is ensured to have a room for wrapping the joint of the bottom edge of the inner cylinder of the double-layer sample cylinder and the metal chassis, and the sealing effect is ensured.
Furthermore, an inlet of the water-gas separator is communicated with a gap inside the sealed silica gel base through an organic glass pipe, and an outlet of the water-gas separator is communicated with the air suction pump through an organic glass pipe; the liquid supply cylinder is communicated with a through hole arranged in the center of the sealing top cover through a silicone tube.
Preferably, the through hole that sealing top cap center set up leads to for inverted circular truncated cone shape, and the top cap outside is provided with the connection mouth and the central through hole intercommunication, connect mouth and silicone tube intercommunication.
Furthermore, the number of the bosses in the cavity of the sealing silica gel base is 3-4, and the height of the bosses can support the double-layer sample cylinder to enable a channel penetrating through a gap between the inner cylinder and the outer cylinder of the double-layer sample cylinder to be formed between the bottom sealing latex sleeve and the inner bottom of the sealing silica gel base, so that the requirement of vacuumizing is met.
Furthermore, a valve is arranged at one end of the connecting pipeline which is connected between the liquid supply cylinder and the sealing top cover, and the water-gas separator is provided with a valve.
Further, the liquid supply cylinder is higher than the top of the double-layer sample cylinder in level.
Further, for guaranteeing sealed effect, the top of the side wall sealing latex sleeve is tightened through the latex ribbon, the edge of the bottom sealing latex sleeve is tightened through the latex ribbon after wrapping the edge of the bottom of the double-layer sample cylinder inner cylinder, the edge of the sealing silica gel base is tightened through the self-locking metal ribbon and the double-layer sample cylinder, and the joint of the silicone tube and the sealing top cover is connected through the bolt with the sealing ring.
Furthermore, the metal hoop is a hoop detachably connected with the double-layer sample cylinder through two semicircles with joints and matched with the double-layer sample cylinder through screws, and the three-flap module is hooped through adjusting screws to form the sample cylinder during sample preparation in the double-layer sample cylinder.
According to the air-extracting negative-pressure biological slurry filling device, the double-layer sample cylinder, the sample preparation base, the hoop, the hollow floral tube and the chassis are preferably made of stainless steel materials, and the liquid supply cylinder is preferably made of organic glass; the moisture sensor and monitoring display may be commercially available or custom made.
The method for grouting the viscous soil column by adopting the air-pumping negative-pressure biological slurry filling device comprises the following steps of:
(1) Putting a piece of filter paper with the same area as the bottom area of the sample cylinder in a sample preparation base, vertically putting the three-petal mold of the double-layer sample cylinder in the sample preparation base to form a sample cylinder, laying a layer of filter paper on the inner wall of the double-layer sample cylinder, hooping the three-petal mold by using a hoop, and then filling the double-layer sample cylinder with soil;
(2) According to the invention, the air-pumping negative-pressure biological pulp perfusion device is connected with all parts of the device;
(3) Closing a valve on the silicone tube, opening an air extraction pump, extracting air in the sample and keeping a certain negative pressure around the sample; placing the liquid supply cylinder at a certain height to ensure that the bottom of the liquid supply cylinder is at least higher than the top surface of the sealing top cover; pouring a certain amount of bacterial liquid into the liquid supply cylinder, opening the valve, sucking the bacterial liquid into the hollow floral tube and continuously permeating the sample, pouring the cementing liquid with the same volume into the liquid supply cylinder after the slurry in the liquid supply cylinder is sucked dry, and continuously maintaining air suction to enable the cementing liquid to enter the hollow floral tube and continuously permeate into a soil body. And in the whole air pumping process, if at least 2 water sensors on the same side sense the liquid seepage, the air pumping pump is closed.
(6) Opening a water-gas separator valve, measuring and analyzing the volume and components of the effluent liquid, and calculating the volume of the injected bacterial liquid and the cementing liquid in the soil sample; the test device is placed in a constant temperature and humidity environment for maintenance for a period of time (CaCO is obtained according to the experience of the previous test 3 The time when the production amount is basically stable), the subsequent grouting is carried out for a plurality of times according to the same method. After the test is finished, the instrument parts are removed, and the sample can be taken out for testing the physical, chemical or mechanical properties of the sample.
The working principle of the device is that negative pressure is formed around a sample through the vacuumizing action, and slurry flows into the hollow floral tube under the action of pressure difference. And continuously maintaining the air suction, and generating negative pressure relative to the atmospheric pressure in the sample to enable the slurry in the hollow perforated pipe to transversely flow to the periphery through the small holes of the perforated pipe. The moisture sensor can ensure that the bacterial liquid and the cementing liquid completely penetrate through the whole soil sample, and the amount of the liquid permeated in the soil sample can be quantitatively determined by measuring the volume of the liquid collected in the moisture separator and the volume of the liquid remained in the liquid supply cylinder.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can completely and slowly fill the bacterial liquid and the cementing liquid into the cohesive soil column in batches under the condition of not disturbing the cohesive soil sample, and carry out a microorganism induced mineralization test, thereby further carrying out the research on the physical, chemical or mechanical properties of the cohesive soil after mineralization treatment. But also for large earth column treatments (only the test unit needs to be scaled up).
2. The device provided by the invention ensures that the liquid completely permeates the soil sample by adding the moisture sensor, and solves the problem that the liquid filling amount in the soil column cannot be quantitatively estimated due to liquid seepage by collecting the liquid in the moisture separator.
3. According to the invention, the side surface of the soil sample is subjected to the air extraction action of vacuum negative pressure, the slurry flows from the center of the soil column to the periphery transversely through the hollow perforated pipe, the streamline is horizontal along the radial direction of the cylinder, the flow field is simple, the uniformity of grouting is ensured, the problem of non-uniformity caused by the complicated flow field in the sample cylinder due to the air extraction negative pressure action on the bottom of the sample cylinder is solved, and the problems of difficult grouting and non-uniform grouting in the research of the induced mineralization effect of microorganisms in cohesive soil are solved.
4. According to the invention, the hollow floral tube is inserted into the center of the soil sample, the grout is sucked into the hollow floral tube under the action of the air suction negative pressure, the air suction state is continuously maintained, the grout penetrates through the small holes of the hollow floral tube and transversely flows from the center to the periphery, the filling uniformity is ensured, and meanwhile, the hollow floral tube can shorten and simplify the seepage path.
5. The invention has a sample preparation device, can directly prepare samples in a sample cylinder, adopts the double-layer metal three-petal mold as the sample cylinder, supports the samples during sample preparation and hoops the three-petal mold sample cylinder, so that the whole sample preparation equipment is stable, convenient to disassemble and strong in mobility, and can take out the complete soil sample after grouting to determine the physical, chemical or mechanical properties of the soil sample. The setting up of sealed silica gel base makes whole instrument can dismantle can guarantee the leakproofness again at the grout in-process.
6. According to the invention, the bacterial liquid and the cementing liquid are respectively sucked into the soil sample in sequence under the action of negative pressure of air exhaust, so that the situation that the bacterial liquid and the cementing liquid react quickly to generate CaCO when not fully permeating into the soil sample due to the fact that the bacterial liquid and the cementing liquid are mixed and poured into the soil sample is avoided 3 . Guarantee CaCO 3 The soil sample is generated in the soil sample and is tightly bonded with soil particles to really realize the cementation effect.
7. The device has the advantages of simple structure, low manufacturing cost, clear principle and strong applicability.
Drawings
FIG. 1 is a longitudinal cross-sectional view of an air-extracting negative pressure bio-slurry infusion device for cementitious soil columns (this view is a longitudinal cross-sectional view with one side along a three-piece mold splice line and the other side cut across along the splice line);
FIG. 2 is a schematic view of a double-layered sample tube, a hoop and a sample preparation base during sample preparation;
FIG. 3 is a three-piece mold structure view of a double-layered sample cartridge;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
FIG. 6 is a detailed cross-sectional view of the metal chassis and surrounding components at the bottom of the grouting apparatus
FIG. 7 is a top view of a sealing silica gel base;
FIG. 8 is a schematic diagram of the liquid flow field inside the soil column in the negative pressure pumping mode (a) and the bottom negative pressure pumping mode (b) of the invention.
In the figure, 1-a sealing top cover, 2-a double-layer sample cylinder, 3-a side wall sealing latex sleeve, 4-a latex ribbon, 5-a metal chassis, 6-a bottom sealing latex sleeve, 7-a moisture sensor, 8-a monitoring display, 9-a sealing silica gel base, 10-a self-locking metal ribbon, 11-an organic glass tube, 12-a moisture separator, 13-an air pump, 14-a silica gel tube, 15-a liquid supply cylinder, 16-a hoop, 17-a sample preparation base and 18-a hollow floral tube.
Detailed Description
The present invention is further illustrated below with reference to specific examples. It should be noted that the following examples are only intended to illustrate the present invention and should not be construed as limiting the scope of the present invention, and that those skilled in the art can make modifications and variations of the present invention without departing from the spirit and scope of the present invention.
Example 1
The air-extracting negative-pressure biological slurry filling device suitable for the viscous soil column comprises a grouting part and a sample preparation part, wherein the grouting part comprises a sealing top cover 1, a hollow floral tube 18, a double-layer sample cylinder 2, a side wall sealing latex sleeve 3, a metal chassis 5, a bottom sealing latex sleeve 6, a moisture sensor 7, a monitoring display 8, a sealing silica gel base 9, a water-gas separator 12, an air extracting pump 13 and a liquid supply cylinder 15; the sample preparation part comprises a sample preparation base 17, a hoop 16 and a double-layer sample cylinder 2, wherein the double-layer sample cylinder 2 is a common part of the grouting part and the sample preparation part.
The double-layer sample cylinder 2 is in a double-layer cylindrical shape and consists of three one-third cylindrical valve molds. Each split mold consists of an inner layer of one third cylinder and an outer layer of one third cylinder, the tops of the inner layer of one third cylinder and the outer layer of one third cylinder are connected into a whole, and the bottoms of the inner layer of one third cylinder and the outer layer of one third cylinder are separated, so that a gap is reserved between the inner layer of one third cylinder and the outer layer of one third cylinder. And an intermediate supporting block 19 for reinforcing the stability and connecting the outer layer petal mould and the inner layer petal mould is arranged between the inner layer and the outer layer of the bottom of each petal mould. Three one third cylinders of the inner cylinder of the double-layer sample cylinder 2 are uniformly provided with a plurality of through holes of 1-2 mm along the circumferential direction. The sealing top cover 1 is matched with the outer diameter of the outer cylinder of the double-layer sample cylinder 2 so as to seal the top of the double-layer sample cylinder 2.
The lower end of the hollow perforated pipe 18 is sealed and extends into the bottom of the double-layer sample cylinder 2, the top end of the hollow perforated pipe is communicated with a through hole formed in the center of the sealing top cover 1 and is fixed on the sealing top cover 1, through holes are uniformly formed in the pipe wall of the hollow perforated pipe 18 along the circumferential direction of the pipe, the aperture of each through hole is 1-2 mm, and the distance between the through holes is 3-4 mm. Two rows of adjacent through holes in vertical height are arranged in a staggered mode vertically, the bottom of the hollow floral tube 18 is sealed to form a cone, soil can be conveniently inserted, and the soil can be prevented from entering the floral tube to block a channel. The length of the hollow floral tube 18 is such that after the double-layer sample cylinder 2 is sealed by the sealing top cover 1, the tail end of the hollow floral tube 18 extends to the metal chassis 5, and the straight line of the hollow floral tube 18 coincides with the longitudinal axis of the center of the double-layer sample cylinder 2.
The metal chassis 5 is matched with the outer diameter of the inner cylinder of the double-layer sample cylinder 2 to seal the bottom of the double-layer sample cylinder 2, the bottom sealing latex sleeve 6 covers the metal chassis 5, and the edge of the bottom sealing latex sleeve wraps the joint of the edge of the inner cylinder of the double-layer sample cylinder 2 and the metal chassis 5 to seal. The side wall sealing latex sleeve 3 is matched with the double-layer sample cylinder 2, is sleeved on the outer surface of the double-layer sample cylinder 2, and wraps the joint of the sealing top cover 1 and the double-layer sample cylinder 2 to seal. The middle supporting block 19 of the double-layer sample cylinder 2 is away from the edge of the bottom of the petal mold by a certain distance, so that the bottom sealing latex sleeve 6 can be ensured to have room to wrap the joint of the edge of the bottom of the inner cylinder of the double-layer sample cylinder 2 and the metal chassis 5, and the sealing effect is ensured.
The sealing silica gel base 9 is provided with an inner concave cavity matched with the double- layer sample cylinder 2, 3 bosses are arranged at the bottom of the concave cavity, the lower part of the double-layer sample cylinder 2 together with the side wall sealing latex sleeve 3 on the outer surface of the double-layer sample cylinder, the metal chassis 5 and the bottom sealing latex sleeve 6 stand in the sealing silica gel base 9 together and are supported by the bosses, and a gap is reserved between the metal chassis 5 and the bottom of the concave cavity of the sealing silica gel base 9 under the action of the bosses. The height of the boss meets the requirement of being capable of supporting the double-layer sample cylinder 2 to enable a channel which penetrates through a gap between the inner cylinder and the outer cylinder of the double-layer sample cylinder 2 to be formed between the bottom sealing latex sleeve 6 and the inner bottom of the sealing silica gel base 9, and therefore the requirement of vacuumizing is met.
The inlet of the water-gas separator 12 is communicated with the gap inside the sealing silica gel base 9 through an organic glass tube 11, and the outlet of the water-gas separator 12 is communicated with the air pump 13 through the organic glass tube 11. The moisture separator 12 is provided with a valve. The through-hole that sealing top cap 1 center set up leads to for inverted circular truncated cone shape, and the top cap outside is provided with connects mouth and central through-hole intercommunication, supply liquid section of thick bamboo 15 to pass through the connection mouth on the silicone tube 14 intercommunication sealing top cap 1, be provided with the valve on the silicone tube 14. During pouring, the liquid supply cylinder 15 is higher than the top of the double-layer sample cylinder 2.
The sample preparation base 17 is provided with a concave cavity which is matched with the bottom of the double-layer sample cylinder 2 and can accommodate the bottom of the double-layer sample cylinder 2, the metal hoop 16 is in a semicircular shape with two joints and is detachably connected into a hoop matched with the double-layer sample cylinder 2 through a screw, and the three-flap module is hooped through an adjusting screw to form the sample preparation cylinder during sample preparation in the double-layer sample cylinder 2.
For guaranteeing sealed effect, the top of lateral wall seal emulsion cover 3 is tightened through latex ribbon 4, tighten through latex ribbon 4 behind the edge parcel double-deck specimen cylinder 2 inner tube bottom edge of the sealed emulsion cover 6 in bottom, the edge of sealing silica gel base 9 is tightened through from locking-type metal ribbon 10 and double-deck specimen cylinder 2, and the junction of silicone tube 14 and sealed top cap 1 is through the bolted connection who takes the sealing washer.
In the air-extracting negative-pressure biological slurry perfusion device of the embodiment, the double-layer sample cylinder 2, the sample preparation base 17, the hoop 16, the hollow perforated pipe 18 and the metal chassis 5 are made of stainless steel, and the liquid supply cylinder 15 is made of organic glass. The moisture sensor 7 and monitoring display 8 may be commercially available or custom made.
The function of each part in the device is as follows:
the sealing top cover 1: the center of the disc with a certain thickness is provided with a variable cross-section hole, the top of the disc is provided with a bolt hole for connecting the silicone tube 14 with the valve, a sealing ring is arranged in the bolt hole to ensure that the bolt at one end of the silicone tube 14 with the valve is inserted and screwed, and the bottom of the disc is welded with the hollow perforated pipe 18. The central opening in the disc is a conical channel.
Double-layer sample tube 2: the soil sample is used as a sample preparation mold, the periphery of the sample is in a negative pressure state under the action of vacuum air suction, the components can be detached, and the complete soil sample can be taken out after grouting is finished and then physical, chemical or mechanical property measurement is carried out.
Side wall sealing latex sleeve 3: because gaps are formed among the three halves of the assembled sample cylinder 2, the gaps are wrapped by the gaps to ensure the tightness during air exhaust.
And (4) a latex band: the material is the same as the latex sleeve 3 and has the function of ensuring the sealing of the joints of all the parts.
The metal chassis 5: and (4) supporting the sample cylinder 2 and the soil sample to ensure that the bottom is sealed.
Bottom sealed latex sleeve 6: wrap up metal chassis 5 and sealed metal chassis 5 and sample section of thick bamboo 2 junction, the bottom is sealed when guaranteeing to bleed.
The moisture sensor 7: sensing whether the slurry has flowed out from the position and transmitting the slurry to the monitoring display 8, and monitoring whether the slurry uniformly seeps to each part of the soil sample.
The monitoring display 8: a monitoring display 8 has 3 pilot lamps and connects three lamella mould concatenation seam edge, middle and lower 3 moisture sensor 7 respectively, and the pilot lamp on the display is bright to represent that this department monitors liquid and oozes.
Sealing the silica gel base 9: the bottom of the sample cylinder 2 is sealed and a sealable interface is provided for an organic glass tube 11 for air suction, and 3 supporting cylinders inside are tightly attached to a bottom sealing latex sleeve 6 to prop against a metal chassis 5 (see figure 7).
Self-locking metal ribbon 10: and (3) tightening the upper end of the sealing silica gel base 9 to ensure that the sealing silica gel base 9 is tightly attached to the side wall sealing latex sleeve 3 and the sample cylinder 2 to ensure sealing.
Organic glass tube 11: and providing a vacuum air exhaust channel, and connecting the sealed silica gel base 9, the water-gas separator 12 and the air exhaust pump 13.
Valved moisture separator 12: because the slurry exists in a state of being mixed with water and gas after seepage in the air pumping process, the equipment can separate water and gas, on one hand, seepage liquid can be collected, and on the other hand, the liquid can be prevented from entering the air pumping pump 13 to cause damage.
The air pump 13: the air is pumped to provide a vacuum negative pressure environment.
Silicone tube with valve 14: when the valve is closed, the whole equipment interior can be sealed, and when the valve is opened, the equipment interior and the liquid supply cylinder 15 are communicated, so that slurry in the liquid supply cylinder 15 is sucked into the hollow perforated pipe 18 under the action of pressure difference.
Liquid supply cylinder 15: and containing the slurry and the cementing liquid.
The metal ferrule 16: the three-split mold sample tube is composed of a bolt and two metal semicircular hoops (shown in figure 2) with a certain thickness and a diameter slightly smaller than the outer diameter of the sample tube 2, and has the function of ensuring the close fit of the three-split mold sample tube 2 and facilitating sample preparation.
Metal sample base 17: when preparing the sample, the sample cylinder 2 is placed in the sample cylinder to ensure stability (see figure 2)
Hollow floral tube 18: under the action of air suction and negative pressure, the slurry can be sucked into the hollow floral tube 18, and the slurry in the floral tube can horizontally seep to the periphery through the small holes.
Example 2
The method for grouting the sticky soil column by adopting the device in the embodiment 1 comprises the following steps:
(1) Firstly, preparing soil materials for the test according to the test requirements, and then sequentially pasting 3 moisture sensors 7 on the unilateral outer wall of each double-layer three-petal mold inner cylinder from top to bottom at equal distances. Cutting 1 piece of rectangular filter paper with the length slightly larger than the inner periphery of the three-petal mold, 1 piece of filter paper and one piece of filter paper with the same size as the bottom surface of the sample cylinder 2, tightly attaching the cut rectangular filter paper to the inner side of the metal three-petal mold, clamping the edges of the filter paper in splicing seams of the metal three-petal mold, and splicing the metal three-petal mold double-layer sample cylinder 2 (splicing one side of the three-petal mold without the moisture sensor 7 with the other side of the three-petal mold with the moisture sensor 7). After the sample cylinder 2 is spliced, the sample cylinder is hooped by a customized matched metal hoop 16, and the screw is adjusted to enable the metal three-petal-mold double-layer sample cylinder 2 to be tightly attached.
(2) A piece of filter paper with the same area as the bottom surface of the sample cylinder 2 is placed at the bottom of the metal sample base 17, the sample cylinder 2 which is tightened is placed on the sample base 17, and the soil materials are layered in the sample base 17 as required.
(3) The sample preparation base 17 is taken down, and a metal chassis 5 is placed at the lower end of the sample cylinder 2 filled with the sample and is tightly attached to the bottom filter paper. The connecting seam between the metal chassis 5 and the inner cylinder of the sample cylinder 2 is sleeved and wrapped by a bottom sealing latex sleeve 6, and then the upper port of the bottom sealing latex sleeve 6 is fastened by a latex bandage 4 to ensure the bottom sealing of the sample. The seal cap 1 is placed on the upper end of the sample tube 2, and the hollow floral tube 18 is inserted vertically into the soil sample. The metal hoop 16 is taken down, the outer side of the whole sample cylinder 2 and the joint of the outer side of the sample cylinder and the sealing top cover 1 are sealed by the side wall sealing latex sleeve 3, and the upper port of the latex sleeve 3 is fastened by a latex ribbon 4. A connecting wire of the moisture sensor 7 and the monitoring display 8 is tightly attached to the latex sleeve 3 and is led out upwards, meanwhile, the sealing silica gel base 9 is sleeved on the outer side of the sample cylinder 2, a boss at the bottom of the inner side of the sample cylinder is tightly attached to the bottom sealing latex sleeve 6 and props against the metal chassis 5, the latex sleeve 3 on the outer side of the sample cylinder 2 is tightly attached to the side wall of the sealing silica gel base 9, and the top of the sealing silica gel base 9 is tightly tied and sealed by the self-locking metal binding belt 10.
(4) One end of an organic glass tube 11 is inserted into a small hole at the bottom of the sealed silica gel base 9, and the other end of the organic glass tube passes through the water-gas separator 12 and is connected to an air pump 13. The silicone tube 14 with the valve is inserted into the bolt hole of the metal sealing top cover 1 by a bolt at one end of the valve and screwed tightly, and the other end of the silicone tube is connected with the flow outlet tube below the organic glass liquid supply cylinder 15.
(5) After the connection is finished, the valve on the silicone tube 14 is closed, and the air pump 13 is opened to pump out the air in the sample. The liquid supply cylinder 15 is placed at a certain height, so that the bottom of the liquid supply cylinder 15 is at least higher than the top surface of the sealing top cover 1, then a certain amount of bacterial liquid is poured into the liquid supply cylinder 15, the valve is opened, the bacterial liquid is sucked into the hollow flower tube 18 and continuously permeates into a sample, after the slurry in the liquid supply cylinder 15 is completely sucked, the same volume of cementing liquid is poured into the liquid supply cylinder 15, and air suction is continuously kept to enable the cementing liquid to enter the hollow flower tube 18 and continuously permeate into soil. In the whole air suction process, if at least 2 sensors 7 on the same side sense the liquid seepage, the air suction pump 13 is closed.
(6) The valve of the moisture separator 12 is opened and the volume and composition of the effluent liquid is measured and analyzed. And calculating the volume of the bacteria liquid and the cementing liquid injected into the soil sample. The test device is placed in a constant temperature and humidity environment and maintained for a certain time (CaCO is obtained according to the experience of the previous test 3 The time when the content is basically stable), the required subsequent multiple grouting is carried out according to the same method. After the test is finished, the instrument parts are dismantled, and the sample can be taken out to carry out physical, chemical and mechanical property tests on the sample.
Claims (8)
1. The air-extracting negative-pressure biological slurry filling device suitable for the viscous soil column is characterized by comprising a grouting part and a sample preparation part, wherein the grouting part comprises a sealing top cover (1), a hollow floral tube (18), a double-layer sample cylinder (2), a side wall sealing latex sleeve (3), a metal chassis (5), a bottom sealing latex sleeve (6), a moisture sensor (7), a monitoring display (8), a sealing silica gel base (9), a water-gas separator (12), an air extracting pump (13) and a liquid supply cylinder (15); the sample preparation part comprises a sample preparation base (17), a hoop (16) and a double-layer sample cylinder (2), and the double-layer sample cylinder (2) is a common part of the grouting part and the sample preparation part;
the double-layer sample cylinder (2) is in a double-layer cylindrical shape and consists of three one-third cylindrical petals, each petal consists of an inner layer of one-third cylinder and an outer layer of one-third cylinder, the tops of the inner layer of one-third cylinders are connected into a whole, the bottoms of the inner layer of one-third cylinders are separated, a gap is reserved between the inner layer of one-third cylinders and the outer layer of one-third cylinders, and a plurality of through holes are uniformly formed in the three one-third cylinders of the inner cylinder along the circumferential direction; the lower end of the hollow perforated pipe (18) is closed and extends into the bottom of the double-layer sample cylinder (2), the top end of the hollow perforated pipe is communicated with a through hole arranged in the center of the sealing top cover (1) and is fixed on the sealing top cover (1), and through holes are uniformly arranged on the pipe wall of the hollow perforated pipe (18) along the pipe circumferential direction; the length of the hollow perforated pipe (18) meets the condition that after the double-layer sample cylinder (2) is sealed by the sealing top cover (1), the tail end of the hollow perforated pipe (18) extends to the metal chassis (5), and the straight line where the hollow perforated pipe (18) is located is superposed with the longitudinal axis of the center of the double-layer sample cylinder (2);
the sealing top cover (1) is matched with the outer diameter of the outer cylinder of the double-layer sample cylinder (2) to seal the top of the double-layer sample cylinder (2); the outer diameter of the metal chassis (5) is matched with the outer diameter of the inner cylinder of the double-layer sample cylinder to seal the bottom of the double-layer sample cylinder (2), the bottom sealing latex sleeve (6) covers the metal chassis (5), and the edge of the bottom sealing latex sleeve wraps the joint of the edge of the inner cylinder of the double-layer sample cylinder (2) and the metal chassis (5) to seal; the side wall sealing latex sleeve (3) is matched with the double-layer sample cylinder (2), is sleeved on the outer surface of the double-layer sample cylinder (2), and wraps the joint of the sealing top cover (1) and the double-layer sample cylinder (2) to seal; the moisture sensor (7) is fixedly arranged on the outer surface of the inner cylinder of the three-petal mold along the elevation and is connected with the monitoring display (8) through a data line; the sealed silica gel base (9) is provided with an internal concave cavity matched with the double-layer sample cylinder (2), a plurality of bosses are arranged at the bottom of the concave cavity, the lower part of the double-layer sample cylinder (2) together with the side wall sealed latex sleeve (3) on the outer surface of the double-layer sample cylinder, the chassis (5) and the bottom sealed latex sleeve (6) are erected in the sealed silica gel base (9) and supported by the bosses, so that a gap is reserved between the metal chassis (5) and the bottom of the concave cavity of the sealed silica gel base (9); 3-4 bosses are arranged in the concave cavity of the sealing silica gel base (9), and the height of the bosses can support the double-layer sample cylinder (2) to enable a channel penetrating through a gap between the inner cylinder and the outer cylinder of the double-layer sample cylinder (2) to be formed between the bottom sealing latex sleeve (6) and the inner bottom of the sealing silica gel base (9);
the inlet of the water-gas separator (12) is communicated with the gap inside the sealed silica gel base (9), and the outlet of the water-gas separator (12) is communicated with the air pump (13); the liquid supply cylinder (15) is communicated with a through hole arranged on the sealing top cover (1); the sample preparation base (17) is provided with a cavity which is matched with the bottom of the double-layer sample cylinder (2) and can accommodate the bottom of the double-layer sample cylinder (2), and the hoop (16) is matched with the outer diameter of the double-layer sample cylinder (2) and used for fixing the three-flap mold to form the double-layer sample cylinder (2) in the sample preparation process.
2. The air extraction negative pressure biological pulp perfusion device suitable for the adhesive soil column as claimed in claim 1, wherein the diameter of the through holes uniformly arranged in the circumferential direction of the hollow floral tube (18) is 1-2 mm, the distance between the through holes is 3-4 mm, two rows of adjacent through holes in the vertical height are vertically arranged in a staggered manner, and the bottom of the hollow floral tube (18) is sealed to form a cone.
3. The air-pumping negative-pressure biological pulp pouring device suitable for the viscous soil column is characterized in that three moisture sensors (7) are fixed at the upper, middle and lower positions of each petal along the elevation, and the moisture sensors (7) on each petal are connected with the same monitoring display (8) through data lines; the monitoring display (8) is provided with three indicator lamps which are respectively connected with an upper moisture sensor, a middle moisture sensor and a lower moisture sensor (7) on the three-petal mould, and the indicator lamps on the display are on to represent that the liquid seepage is monitored at the position.
4. The air-extracting negative-pressure biological pulp pouring device suitable for the adhesive soil column is characterized in that a middle supporting block (19) which is used for connecting the outer-layer petal and the inner-layer petal and used for strengthening the stability is arranged between the bottom inner layer and the bottom outer layer of each petal of the double-layer sample cylinder (2); the middle supporting block is away from the bottom edge of the flap mold by a certain distance, so that the bottom sealing latex sleeve (6) can be ensured to be capable of wrapping the joint of the bottom edge of the inner cylinder of the double-layer sample cylinder (2) and the metal chassis (5).
5. The air extraction negative pressure biological pulp perfusion device suitable for the adhesive soil column is characterized in that an inlet of the moisture separator (12) is communicated with a gap inside the sealing silica gel base (9) through an organic glass tube (11), and an outlet of the moisture separator (12) is communicated with an air extraction pump (13) through the organic glass tube (11); the liquid supply cylinder (15) is communicated with a through hole arranged in the center of the sealing top cover (1) through a silicone tube (14).
6. The air-extracting negative-pressure biological pulp pouring device suitable for the viscous soil column is characterized in that a valve is arranged on a connecting pipeline between a liquid supply cylinder (15) and the sealing top cover (1), and a valve is arranged on the water-gas separator (12).
7. The air-pumping negative-pressure biological pulp perfusion device suitable for the adhesive soil column is characterized in that the top of the side wall sealing latex sleeve (3) is fastened through a latex bandage (4), the edge of the bottom sealing latex sleeve (6) wraps the edge of the bottom of the inner cylinder of the double-layer sample cylinder (2) and is fastened through the latex bandage (4), the edge of the sealing silica gel base (9) is fastened with the double-layer sample cylinder (2) through a self-locking metal bandage (10), and the joint of the silica gel tube (14) and the sealing top cover (1) is connected through a bolt with a sealing ring; the hoop (16) is two semicircles with joints, is detachably connected into a metal hoop matched with the double-layer sample cylinder (2) through a screw, and is used for hooping the three-flap module through an adjusting screw to form a sample preparation cylinder during sample preparation in the double-layer sample cylinder (2).
8. The grouting method of the air-extracting negative-pressure biological slurry perfusion device suitable for the sticky soil column based on any one of claims 1 to 7 is characterized by comprising the following steps of:
(1) Putting a piece of filter paper with the same area as the bottom area of the sample cylinder in a sample preparation base (17), vertically putting the three-flap mold of the double-layer sample cylinder (2) in the sample preparation base (17) to form the sample cylinder, laying a layer of filter paper on the inner wall of the sample cylinder, tightly hooping the three-flap mold by using a hoop (16), and then filling soil materials into the double-layer sample cylinder (2);
(2) Connecting all parts of the device according to the air pumping negative pressure biological pulp perfusion device;
(3) Closing a valve on the silicone tube (14), opening an air extracting pump (13), extracting air in the sample and keeping a certain negative pressure around the sample; placing the liquid supply cylinder (15) at a certain height to ensure that the bottom of the liquid supply cylinder (15) is at least higher than the top surface of the sealing top cover (1); pouring a certain amount of bacterial liquid into a liquid supply cylinder (15), opening a valve, sucking the bacterial liquid into the hollow floral tube (18) and continuously permeating a sample, pouring the cementing liquid with the same volume into the liquid supply cylinder (15) after the slurry in the liquid supply cylinder (15) is sucked dry, continuously keeping air suction to enable the cementing liquid to enter the hollow floral tube (18) and continuously permeate a soil body, and closing an air suction pump (13) if at least 2 moisture sensors (7) on the same side sense liquid permeation in the whole air suction process;
(4) And opening a valve of the water-gas separator (12), measuring and analyzing the volume and the components of the effluent liquid, and calculating the volume of the injected bacterial liquid and the cementing liquid in the soil sample.
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| CN115434378B (en) * | 2022-08-12 | 2024-04-19 | 青岛理工大学 | Single-phase automatic grouting system and method for energy piles in EICP mineralized environment |
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| CN105842430A (en) * | 2016-06-02 | 2016-08-10 | 天津大学 | Test method and test device for transverse microorganism cement grouting |
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