CN108755694B - Slurry stopper and full-hole grouting method for multiple karst caves - Google Patents
Slurry stopper and full-hole grouting method for multiple karst caves Download PDFInfo
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- CN108755694B CN108755694B CN201810610229.5A CN201810610229A CN108755694B CN 108755694 B CN108755694 B CN 108755694B CN 201810610229 A CN201810610229 A CN 201810610229A CN 108755694 B CN108755694 B CN 108755694B
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- 239000002002 slurry Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title abstract description 33
- 235000019994 cava Nutrition 0.000 title description 8
- 239000011440 grout Substances 0.000 claims description 21
- 239000002775 capsule Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 abstract description 34
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 2
- 238000007569 slipcasting Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 49
- 230000008569 process Effects 0.000 description 13
- 230000002829 reductive effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
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- 239000003673 groundwater Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application discloses a stop thick liquid ware and to full hole slip casting method of a plurality of karst cave, this stop thick liquid ware includes: the core tube is provided with a slurry channel which is axially communicated; the elastic sleeve is sleeved on the outer side of the core pipe, a medium cavity is formed between the elastic sleeve and the outer wall of the core pipe, the maximum outer diameter of the elastic sleeve is variable, a first check valve is arranged on the core pipe, the first check valve enables the medium cavity to be communicated with the slurry channel under the condition that the pressure in the slurry channel is larger than or equal to a first set pressure, a second check valve is arranged at the slurry outlet of the core pipe, the second check valve opens the slurry outlet of the core pipe under the condition that the pressure in the slurry channel is larger than or equal to a second set pressure, and the second set pressure is larger than the first set pressure. The invention can adopt a mode of one-time pore forming and one-time grouting to fill karst cave around the horizontal grouting hole, thereby improving the construction efficiency.
Description
Technical Field
The application relates to a grouting stopper and a full-hole grouting method for a plurality of karst caves, and belongs to the field of karst grouting filling, tunnel rock-soil body reinforcement and foundation reinforcement.
Background
Karst is also called karst, and refers to the general term that soluble rock layers such as carbonate limestone, dolomite, sulfate gypsum and the like are chemically and physically affected by water to generate grooves, cracks and cavities, and erosion and accumulation of morphological features and geological effects such as cave-in and depression on the ground surface are generated due to caving of a cavity roof.
The geological conditions of karst areas are generally complex, the investigation difficulty is high, and the influence and hazard caused by the geological conditions are also generally large. In a karst-developing city, special geological conditions lead to strong development of solution gaps and karst caves, seepage liquefaction, groundwater corrosion and vacuum effect are extremely easy to cause karst ground collapse geological disasters. The method has the advantages of burst property, mass property and strong destructive property, and the karst collapse problem is a problem to be solved in urban construction, and particularly when underground engineering construction such as subways, underground pipe galleries and the like exists in urban construction, the influence of karst on the underground engineering construction and the existing construction around the underground engineering construction is not neglected.
When construction engineering is carried out in karst areas, how to reasonably and scientifically treat karst caverns and prevent underground and ground collapse is always the focus of research of expert students at home and abroad. The karst development area of China is widely distributed, and complex karst strata are frequently encountered in the projects of railways, highways, buildings, water conservancy projects and the like along with the increase of foundation construction of China in recent years, so that a series of problems are brought to engineering construction, and karst grouting is a new technology for solving the problems.
In general, karst grouting is performed by vertically drilling holes on the ground, and injecting slurry formed by inert materials into karst cracks, karst cave and soft plastic clay body pores under the action of certain pressure so as to fill the karst cave, control the whole settlement of the foundation and reduce deformation. The method is mainly aimed at the foundation treatment process in the early stage of construction, and when karst ground collapse occurs to the built construction, the method of vertical ground drilling cannot be solved due to limited construction space.
The prior karst cavity grouting treatment is mostly carried out by means of vertical exploration holes, the vertical drilling has better treatment effect on single building structures, and the construction cost is lower, for example, the karst cavity filling under pile foundations and independent foundations, but the ground drilling treatment effect is greatly reduced due to the discontinuity and the dispersibility of the karst cavity when the karst cavity grouting treatment is used for treating the foundation under the linear building structures such as subways, underground pipe galleries, railways and highways. Meanwhile, when the ground construction conditions are complex and the construction conditions of conventional drilling equipment (vertical hole drilling equipment) are not provided at a plurality of places, the construction feasibility of ground drilling grouting can be greatly reduced, and at present, no effective treatment means for completing the task of filling grouting treatment of karst cave encountered in linear construction projects such as subways, pipe galleries and the like at home exist.
Disclosure of Invention
The invention aims to provide a grouting stopper and a full-hole grouting method for a plurality of karst caves, so as to overcome the defects in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the embodiment of the application discloses a slurry stopper includes:
the core tube is provided with a slurry channel which is axially communicated;
an elastic sleeve sleeved on the outer side of the core tube, a medium cavity formed between the elastic sleeve and the outer wall of the core tube, the maximum outer diameter of the elastic sleeve being variable,
wherein,
the core pipe is provided with a first check valve which enables the medium cavity to be communicated with the slurry channel when the pressure in the slurry channel is larger than or equal to a first set pressure,
a second check valve is arranged at the slurry outlet of the core tube, the second check valve opens the slurry outlet of the core tube when the pressure in the slurry channel is more than or equal to a second set pressure,
the second set pressure is greater than the first set pressure.
Preferably, in the slurry stopper, an accelerator is disposed in the medium cavity.
Preferably, in the slurry stopper, the elastic sleeve is a rubber capsule, and two ends of the rubber capsule are respectively bound on the core tube.
Preferably, in the slurry stopper, two ends of the core tube are respectively provided with a quick connector, and the quick connectors are sleeved outside the core tube.
Preferably, in the slurry stopper, the quick connector has a threaded connection surface.
Correspondingly, the application also discloses a full-hole grouting method for a plurality of karst caves, which comprises the following steps:
s1, drilling by adopting a drilling machine, and connecting a plurality of karst caves in series by one-time drilling;
s2, installing any one of the slurry stoppers at the tail end of a grouting drill rod, and conveying the slurry stopper to a grouting position;
s3, introducing slurry into the grouting drill pipe, and lifting the grouting pressure to enable the first check valve to be opened, so that the elastic sleeve is expanded to be closely attached to the side wall of the drilled hole;
s4, continuing to increase grouting pressure to enable the second check valve to be opened, and injecting the slurry into the karst cave until the karst cave is fully filled;
and S5, taking out the grouting drill rod.
Preferably, in the above-mentioned full-hole grouting method for multiple karst cave, the grouting drill rod and the grout stopper are rotationally connected,
and after grouting is finished, the grouting drill rod is taken out by rotating the grouting drill rod, and the grouting stopper is left in the drill hole.
Preferably, in the above full hole grouting method for multiple karst caves, the drilling machine is a horizontal directional drilling machine.
Preferably, in the above full hole grouting method for multiple karst holes, the multiple karst holes are connected in series in a horizontal direction.
Compared with the prior art, the invention has the advantages that:
(1) The high-precision overlength horizontal directional grouting is adopted to provide a new karst cave grouting construction means for underground construction projects such as track traffic, pipe galleries and the like under the existing ground building (the existing building is not required to be dismantled, the existing building is not influenced, and the traffic is not influenced);
(2) And the track is measured and corrected in real time in the horizontal drilling process according to the designed track, so that the track error of the horizontal drilling is reduced to meet the high-precision exploration in subway and pipe gallery construction, and the problem of leakage detection caused by hole spacing of conventional vertical drilling is solved. Aiming at karst grouting, the problem of leakage grouting caused by the distance between conventional vertical drilling holes can be reduced to the greatest extent (full-line exploration grouting is carried out on underground linear engineering, the range of the point exploration grouting is larger than that of the vertical holes, and the treatment effect is better).
(3) Through high-precision horizontal track design and control in the construction process, drilling parameters such as drilling speed, slurry consumption, deflecting strength and the like are recorded, drilling treatment is carried out on the basis of exploring the positions of all karst soil holes in the passing range of the horizontal drill, and risks in underground engineering construction are reduced (adverse geological phenomena along all lines of linear underground engineering are ascertained, pretreatment is carried out at the same time, and risks in the construction process are reduced, which are not achieved by point drilling on the ground).
(4) Because the horizontal drilling hole is combined with the position of the karst cave, the slurry is easy to outflow before solidification and cannot be reinforced under the influence of gravity, and the grouting device and the construction method can effectively solve the problem of slurry leakage in the grouting process of the horizontal hole.
(5) And the horizontal drilling grouting is carried out, the construction site is fixed, the cost of transporting and transferring materials and equipment in the conventional construction mode is reduced, and the working efficiency is improved.
(6) And in the grouting process, according to the size and filling degree of the karst cave, the construction process method is adjusted, and the target horizon can be treated by the vector.
(7) And the karst cave around the horizontal grouting holes can be filled in a one-time hole forming and one-time grouting mode, so that the construction efficiency is improved.
(8) The grouting device consisting of the disposable front grouting stopper, the grouting device and the rear grouting stopper does not need to wait for solidification of slurry, so that the construction efficiency is improved, and meanwhile, the problem of poor filling rate of the karst cave caused by outflow of unset slurry in the karst cave at the upper part of the grouting hole is effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a grouting device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the front slurry stopper according to the embodiment of the present invention;
FIG. 3 is a schematic view of the rear end stop according to an embodiment of the present invention;
FIG. 4 is a side view of a grouting device according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a grouting device according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view of a horizontal directional grouting process according to a first embodiment of the present invention;
FIG. 7 shows the state of the grouting device before the grouting of the horizontal drill is started in the first application embodiment of the invention;
FIG. 8 shows the state of the grouting device after the grouting of the horizontal drill is started in the first application embodiment of the invention;
FIG. 9 is a cross-sectional view of a horizontal directional grouting process according to a second embodiment of the present invention;
FIG. 10 shows the state of the grouting device before the grouting of the horizontal drill is started in the second application embodiment of the invention;
fig. 11 shows a state of the grouting device after the start of the horizontal drilling grouting in the second application embodiment of the present invention.
Detailed Description
In order to solve the problem that the ground does not have the condition of conventional vertical drilling for karst cave grouting, the technical scheme adopted by the embodiment is a shallow horizontal directional drilling grouting construction technology. The method comprises construction floor space selection, horizontal drilling machine selection, drilling track design, drilling data recording, bad geologic body (karst cave) detection, karst cave grouting in a horizontal drilling area and other construction procedures.
Horizontal directional exploration techniques are based on horizontal directional drilling techniques and geophysical logging techniques. The horizontal directional drilling technology is a technology which adopts drilling equipment installed on the ground surface to drill into a stratum at a small earth-entering angle relative to the ground to form a pilot hole, then expands the pilot hole to a required size and lays a pipeline, and has the functions of tracking and guiding in construction.
The horizontal directional hole forming selects a proper horizontal directional drilling machine according to geological data, and the size of the back dragging force, the feeding stroke and the type of the drill rod are main indexes of the drilling machine selection.
After the model of the drilling machine is selected, a reasonable site is selected according to the indexes of occupied area, traffic condition, hydropower supply condition, slag discharging requirement and noise requirement.
According to the spatial position relation between the site and the karst cave grouting section, a drilling track is designed under the condition that the maximum deflecting capacity of the screw drill is not exceeded, and after the peripheral guide signal interference sources are investigated and analyzed, a drilling method and drilling parameters including a soil entering angle, a drilling speed, a slurry consumption and deflecting strength are determined by matching with preliminary analysis of geological data.
In the horizontal drilling process, the position of the karst cave can be judged according to parameters of the drilling process, such as drilling speed, drilling pressure and the like. Meanwhile, various logging instruments manufactured by using physical principles such as electricity, magnetism, sound, heat, nuclear and the like can be conveyed to the bottom of a well by logging cables, various parameters changing along with the depth are continuously recorded by a ground acquisition system along with the lifting of the cables, and the occurrence position of a karst cave on a horizontal drilling path is identified by representing the curve change of the parameters.
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As described in connection with fig. 1, in one embodiment of the present application, a grouting device is provided, which includes a front grout stop 10, a grouting device 20 and a rear grout stop 30, which are sequentially communicated.
In the technical scheme, the front grout stopper and the rear grout stopper are respectively used for plugging drilling holes at two ends of a karst cave to be grouted, and the grouting device is used for grouting the karst cave to be grouted.
As shown in connection with fig. 2, the front slurry stopper 10 includes a first core tube 101, a first elastic sleeve 102, and a plug 103.
The first core tube 101 is provided with a slurry channel which is axially communicated, the first elastic sleeve 102 is sleeved on the outer side of the first core tube 101, a medium cavity is formed between the first elastic sleeve and the outer wall of the first core tube 101, and the maximum outer diameter of the first elastic sleeve 101 is variable.
The plug 103 is plugged at one end of the first core tube 101, and the other end of the first core tube 101 is connected with one end of the grouting device 20.
The first core pipe 101 is provided with a third check valve 104, the third check valve 104 enables the medium cavity to communicate with the slurry channel when the pressure in the slurry channel is greater than or equal to the set pressure,
in the technical scheme, the third check valve is in one-way conduction, the medium cavity is communicated with the slurry channel when the pressure in the slurry channel is greater than or equal to the set pressure, and the medium cavity is closed with the slurry channel when the pressure in the slurry channel is smaller than the set pressure.
In one embodiment, an accelerator is disposed within the media cavity of the front slurry stop 10.
In one embodiment, the first elastic sleeve 102 is a rubber capsule, and two ends of the rubber capsule are respectively bound to the first core tube 101.
In one embodiment, two ends of the first core tube 101 are respectively provided with a quick connector 105, and the quick connector 105 is sleeved outside the first core tube 101.
Further, the quick connector 105 has a threaded connection surface that is threadably coupled to the grouting device 20.
In the grouting process of the front grout stopper 10, grout enters the front grout stopper 10 through the quick connector 105, the third check valve 104 is opened immediately along with the rising of grouting pressure, the grout enters the rubber capsule 102, the rubber increases grouting of the capsule and clings to the wall of a drilling hole along with the rising of pressure, meanwhile, the grout is combined with an accelerator in the rubber capsule 102, and the rubber capsule becomes a solid body after quick solidification, so that the aim of preventing the grout from flowing out from a gap between the grout stopper and the wall of the drilling hole is fulfilled. The front part of the front grout stopper is provided with a choke plug, so that the front grout stopper cannot be used alone.
As shown in connection with fig. 3, the rear slurry stopper 30 comprises a second core tube 301 and a second resilient sleeve 302.
The second core tube 301 has a slurry channel axially communicated with each other, the second elastic sleeve 302 is sleeved on the outer side of the second core tube 301, a medium cavity is formed between the second elastic sleeve 302 and the outer wall of the second core tube 301, and the maximum outer diameter of the second elastic sleeve 302 is variable.
The second core pipe 301 is provided with a first check valve 303, and the first check valve 303 enables the medium cavity to communicate with the slurry channel when the pressure in the slurry channel is greater than or equal to a first set pressure.
A second check valve 304 is provided at the slurry outlet of the second core tube 301, and the second check valve 304 opens the slurry outlet of the second core tube at a second set pressure or more in the slurry passage, the second set pressure being greater than the first set pressure.
In the technical scheme, the first check valve is in one-way conduction, and enables the medium cavity to be communicated with the slurry channel when the pressure in the slurry channel is greater than or equal to a first set pressure, and enables the medium cavity to be closed with the slurry channel when the pressure in the slurry channel is smaller than the first set pressure; the second check valve is communicated in one way, and opens the slurry outlet of the core tube when the pressure in the slurry channel is greater than or equal to the second set pressure, and closes the slurry outlet of the core tube when the pressure in the slurry channel is less than the second set pressure.
In one embodiment, an accelerator is disposed within the media cavity of the rear slurry stop 30.
In one embodiment, the second elastic sleeve 302 is a rubber capsule, and two ends of the rubber capsule are respectively bound to the second core tube 301.
In one embodiment, two ends of the second core tube 301 are respectively provided with quick connectors 305 and 306, and the quick connectors 305 and 306 are sleeved outside the second core tube 301.
Further, the quick connectors 305, 306 have threaded connection faces.
In this technical scheme, the left quick connector 305 of the rear slurry stopper 30 is used to connect with the grouting device 20, the right quick connector 306 is connected with the drill pipe, in the grouting process, the slurry enters the rear slurry stopper through the right quick connector 306, along with the rising of the grouting pressure, the first check valve 303 is opened immediately, the slurry enters the rubber capsule 302, along with the rising of the pressure, the rubber increases the grouting of the capsule and clings to the wall of the hole, meanwhile, the slurry is combined with the accelerator in the rubber capsule 302, and the rubber capsule becomes a solid after quick solidification, so as to achieve the purpose of preventing the slurry from flowing out from the gap between the slurry stopper and the wall of the hole. The rear grout stop can be used alone.
As shown in fig. 4 and 5, the grouting device 20 includes a pipe body 201 which is axially communicated, a plurality of grouting holes 202 are formed in the pipe body 201, and a fourth check valve 203 is correspondingly arranged on each grouting hole 202.
Threaded connection surfaces 204 are also formed at both ends of the pipe body 201, respectively, and the threaded connection surfaces 204 are preferably formed on the inner surface of the pipe body 201.
The grouting device is a grouting device of the horizontal drilling grouting device, the left side threaded connection surface of the grouting device is connected with the front grouting device, the right side threaded connection surface of the grouting device is connected with the rear grouting device, when grout enters the grouting device from the rear grouting device and enters the front grouting device at the same time, the front grouting device and the rear grouting device are expanded and cling to the hole wall along with the gradual increase of pressure, when grouting pressure is continuously increased, the fourth check valve is opened, grout enters the karst cavity through the grouting hole, and grouting is started to be carried out on a karst cave penetrated by drilling. The grouting device needs to be combined with the front and rear grouting devices, and can not be used independently.
As shown in connection with fig. 6-8, in a first application embodiment, a section of an project below a building 401 generally includes a soil layer 402, a developing solution cavity formation 403, a non-solution cavity developing formation 404, and a plurality of solution cavities 405 formed within the developing solution cavity formation 403.
When the karst cave disclosed in the area is independent and the karst cave spacing distance is far; grouting can be performed on the partial area below the built structure by selecting the intra-hole sectional grouting.
First, a drill 406 is used to drill holes, and a plurality of karst holes 405 are connected in series through drill holes 407.
According to the size of the karst cave to be grouted, a grouting device 20 with proper length is selected during grouting, a front grouting device 10, a grouting device 20, a rear grouting device 30 and a drill rod 50 are sequentially connected, a grouting pump is connected with a grouting drill rod, grouting pressure is gradually increased to enable outer capsules of the front grouting device and the rear grouting device to expand and cling to the hole wall (combined with the illustration in fig. 8), grouting pressure is continuously increased to enable a check valve at the grouting hole of the grouting device to be opened, grouting is carried out into the karst cave, after grouting is completed, the drill rod is rotated, the grouting drill rod is taken out, and grouting is repeatedly carried out according to the position of the next karst cave.
In this embodiment, the most distal karst cave may be grouted first, and then the grouting devices (including front, grouting and rear grouting devices) may be replaced, with grouting operations being completed sequentially from far to near. After grouting is completed, the grouting device is permanently left in the karst cave to realize plugging.
Referring to fig. 9 to 11, when the hole has better connectivity and the hole has more holes, a full hole grouting method is selected.
First, a drill 606 is used to drill holes, and a plurality of karst holes 605 are connected in series through the drill 607.
The rear grouting device 30 and the drill rod 50 are sequentially connected, the rear grouting device 30 is placed into a planned grouting section, a grouting pump is connected with the grouting drill rod, grouting pressure is gradually increased to enable an outer capsule of the rear grouting device to expand and cling to a hole wall (see fig. 11), a check valve at a grouting hole of the grouting device is opened due to the fact that grouting pressure is continuously increased, grouting is carried out into a karst cave, after grouting is completed, the drill rod is rotated, and the grouting drill rod is taken out.
In the application embodiment, grouting can be directly carried out on the karst cave at the nearest end, and after grouting is finished, the grouting device is permanently left in the karst cave to realize plugging.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. A slurry stopper is characterized by comprising a front slurry stopper, a slurry injector and a rear slurry stopper which are communicated in sequence,
the front grout stopper and the rear grout stopper are respectively used for plugging the drill holes at the two ends of the karst cave to be grouted, the grouting device is used for grouting the karst cave to be grouted,
the front slurry stopper comprises a first core tube, a first elastic sleeve and a plug, wherein the first core tube is provided with a first slurry channel which is axially communicated, the first elastic sleeve is sleeved on the outer side of the first core tube, a first medium cavity is formed between the first elastic sleeve and the outer wall of the first core tube, the maximum outer diameter of the first elastic sleeve is variable, the plug is plugged at an opening at one end of the first core tube, the other end of the first core tube is connected with one end of the slurry injector, a third check valve is arranged on the first core tube, and the third check valve enables the first medium cavity to be communicated with the first slurry channel when the pressure in the slurry channel is greater than or equal to a set pressure;
the rear slurry stopper comprises a second core tube and a second elastic sleeve, wherein the second core tube is provided with a second slurry channel which is axially communicated, the second elastic sleeve is sleeved on the outer side of the second core tube, a second medium cavity is formed between the second elastic sleeve and the outer wall of the second core tube, the maximum outer diameter of the second elastic sleeve is variable, a first check valve is arranged on the second core tube, the first check valve enables the second medium cavity to be communicated with the second slurry channel when the pressure in the slurry channel is greater than or equal to a first set pressure, a second check valve is arranged at a slurry outlet of the second core tube, the second check valve opens a slurry outlet of the second core tube when the pressure in the slurry channel is greater than or equal to a second set pressure, and the second set pressure is greater than the first set pressure;
the grouting device comprises an axially communicated pipe body, a plurality of grouting holes are formed in the pipe body, a fourth check valve is correspondingly arranged on each grouting hole, when grout enters the grouting device from the rear grouting device and enters the front grouting device at the same time, the front grouting device and the rear grouting device are caused to expand and cling to the hole wall along with the gradual increase of the pressure, and when the grouting pressure continues to increase, the fourth check valve is opened.
2. The slurry stopper of claim 1, wherein an accelerator is disposed within the first and second media cavities.
3. The grout stopper of claim 1 wherein the first and second elastic sleeves are rubber capsules, the rubber capsules being bound at both ends to the first or second core tube, respectively.
4. The slurry stopper according to claim 1, wherein the second core tube is provided with quick connectors at both ends thereof, respectively, the quick connectors being sleeved outside the second core tube.
5. The slurry stop of claim 4, wherein the quick connector has a threaded connection face.
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| CN201810610229.5A CN108755694B (en) | 2018-06-13 | 2018-06-13 | Slurry stopper and full-hole grouting method for multiple karst caves |
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| CN201810610229.5A CN108755694B (en) | 2018-06-13 | 2018-06-13 | Slurry stopper and full-hole grouting method for multiple karst caves |
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| CN110566215B (en) * | 2019-09-27 | 2020-12-01 | 中铁第四勘察设计院集团有限公司 | Shield tunnel instant-dissolving and quick-setting type synchronous grouting method |
| CN112900430B (en) * | 2021-01-22 | 2023-03-28 | 中国建筑第八工程局有限公司 | Cast-in-place pile casing in karst area and construction method of cast-in-place pile |
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