CN110778331B - Pipe for grouting and grouting construction method thereof - Google Patents
Pipe for grouting and grouting construction method thereof Download PDFInfo
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- CN110778331B CN110778331B CN201910935063.9A CN201910935063A CN110778331B CN 110778331 B CN110778331 B CN 110778331B CN 201910935063 A CN201910935063 A CN 201910935063A CN 110778331 B CN110778331 B CN 110778331B
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- 238000010276 construction Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 238000011010 flushing procedure Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 239000011440 grout Substances 0.000 claims description 25
- 239000004568 cement Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 5
- 230000008719 thickening Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 230000008859 change Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 abstract description 22
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 20
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a pipe for grouting and a grouting construction method thereof, and belongs to the technical field of tunnel grouting structures. Including the different short body and the long body of length, the one end lateral wall of short body and long body is equipped with the injected hole, and the other end of short body and long body is equipped with into thick liquid mouth, is equipped with out the thick liquid mouth in the one end that is close to the injected hole on the short body, is equipped with the shutoff board in the one end that is close to the injected hole on the long body. The grouting step is as follows: 1) selecting the distribution position of the grouting drill holes and drilling the holes; 2) flushing grouting drill holes; 3) embedding the short pipe body and the long pipe body and reserving the long pipe body; 4) grouting by the short pipe body and the long pipe body; 5) cutting off the remaining length; 6) and (5) partially densifying the orifice end surface of the grouting drill hole for the second time. The device accessible short tubular body and long tubular body pour into the slip casting drilling respectively with the slip casting liquid in to this realizes that the slip casting is more even, and the slip casting structure is more firm, and the cost that the body used the PPR material simultaneously is lower, be favorable to energy-concerving and environment-protective, and the light characteristics of PPR material also more do benefit to the transportation of material.
Description
Technical Field
The invention relates to the technical field of tunnel grouting structures, in particular to a pipe for grouting and a grouting construction method thereof.
Background
At the present stage, when leakage occurs in a constructed tunnel (a shield tunnel, a mine tunnel, an open cut tunnel, etc.), a certain measure is usually required to be taken to block and reinforce the leakage position of the tunnel, and a grouting method is generally adopted at present.
The grouting guide pipes adopted by the grouting method mainly comprise a metal flower pipe, a small guide pipe, a sleeve valve pipe and the like. Because the grouting guide pipes after grouting are directly buried in the grouting body and are not recycled, the manufacturing cost of the grouting guide pipes made of metal materials is high in tunnels with large grouting areas, and economic waste is easily caused. And the traditional grouting process only carries out single-pipe one-time grouting every time of grouting, so that the problem of uneven grouting exists.
In view of the above-mentioned prior art, the applicant of the present invention has made a lot of repeated and useful researches, and the final products have achieved effective results and have formed the technical solutions to be described below.
Disclosure of Invention
Therefore, the invention provides a pipe for grouting and a grouting construction method thereof, and aims to solve the problems of high manufacturing cost and non-uniform grouting caused by the fact that grouting guide pipes for tunnel grouting reinforcement are all metal single pipes in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a tubular product for slip casting, includes that the components of a whole that can function independently set up and the different short body of length and long body, the one end lateral wall of short body and long body all is equipped with the slip casting hole, and the other end of short body and long body all is equipped with into thick liquid mouth, be equipped with out thick liquid mouth in the one end that is close to the slip casting hole on the short body, be equipped with the shutoff board in the one end that is close to the slip casting hole on the long body.
Further, the short pipe body and the long pipe body are both made of PPR materials.
Furthermore, the grouting holes in the short pipe body are uniformly distributed on one third of the pipe wall of the short pipe body close to one end of the grout outlet, and the grouting holes in the long pipe body are uniformly distributed on one third of the pipe wall of the long pipe body close to one end of the plugging plate.
Further, the length range of the short pipe body is 2.5-4 m, and the length range of the long pipe body is 4-5.5 m.
Further, the aperture range of the short pipe body and the aperture range of the long pipe body are both 18-22 mm.
A grouting construction method of a pipe for grouting comprises the following steps:
1) selecting the distribution positions of grouting drill holes according to the condition of leaked water and drilling the holes;
2) carrying out pore washing on the grouting drill hole;
3) sequentially embedding the short pipe body and the long pipe body and reserving the short pipe body and the long pipe body, and plugging the orifice parts of the grouting drill holes positioned at the outer sides of the short pipe body and the long pipe body;
4) grouting by the short pipe body and the long pipe body;
5) cutting off a short pipe body and a long pipe body which are left outside the grouting drill hole;
6) and (5) partially densifying the orifice end surface of the grouting drill hole for the second time.
Further, the specific process of the step 1) is as follows: the distribution positions of the grouting drill holes are adjusted and selected according to the underground water condition, the rock stratum fracture condition and the effective diffusion radius of the grouting liquid and the actual leakage water condition, wherein the aperture of each grouting drill hole is 50mm, and the depth range of each grouting drill hole is 4.5-6 m.
When the surface of the surrounding rock is complete and grouting drill holes cannot be drilled according to the water outlet crack trend, a plurality of water plugging grouting drill holes are uniformly drilled along the annular direction at the part to be plugged of the grouting section of the tunnel, wherein the annular distance between the orifices of the grouting drill holes is 1.2-1.75 m, 14-20 holes are arranged in each ring, and the row spacing between two adjacent groups of annular grouting drill holes is 1-1.5 m.
Further, the specific process of step 2) is as follows: and immediately carrying out a pore washing procedure on the grouting drill hole after the drilling procedure of the grouting drill hole is finished.
The cleaning mode of the grouting drilling adopts a water discharging mode of sudden pressure rise and sudden pressure decrease, the standard of the flushing end is that the time lasts for 5min after the discharged water is clear, and the total flushing time is not less than 20 min.
And the cleaning mode of the rock cracks of the drill hole adopts high-pressure water to wash the cracks of the drill hole, the washing water pressure is not more than 1MPa, and the washing is finished after the backwater is clarified.
When grouting drill holes in grouting are arranged at the adjacent positions or the drill holes close to the grouting drill holes are not finished for less than 12 hours, flushing operation is not carried out; and re-flushing the grouting drill hole which is not grouted within 24h after the flushing hole.
Further, the specific process of step 3) is as follows: the short pipe body and the long pipe body made of PPR materials are provided with one ends with grouting holes and extend into the grouting drill holes, the short pipe body is reserved at the outer 50mm of the grouting drill holes, and the long pipe body is reserved at the outer 60mm of the grouting drill holes.
And plugging the orifice of the grouting drill hole at the outer side parts of the short pipe body and the long pipe body.
Further, the specific process of the step 4) is as follows: the prefabricated grouting liquid is injected from the grout inlet of the short pipe body and the grout inlet of the long pipe body respectively, the grouting liquid inside the short pipe body is gradually diffused and filled into the grouting drilled holes from the grout outlet and the grouting holes respectively, the grouting liquid inside the long pipe body is gradually diffused and filled into the grouting drilled holes from the long pipe grouting holes, and when the grouting liquid is uniformly filled at the bottoms of the grouting drilled holes and reaches preset balance, the grouting liquid is gradually extruded to one end of the orifice of the grouting drilled hole.
Wherein the grouting liquid adopts P.O42.5-grade portland cement with a water-cement ratio of not less than 1:1, and the grouting pressure adopts 1.5-5.0 MPa.
When the grouting pressure is kept unchanged and the injection rate is continuously reduced, or when the grouting pressure is continuously increased without changing the injection rate, the prefabricated water-cement ratio is not changed.
And when the injection amount of the grouting liquid in the short pipe body or the long pipe body reaches more than 300L, or the injection time reaches 30min, and the grouting pressure and the injection rate are not changed or are not changed remarkably, the prefabricated water-cement ratio is changed to 1.5: 1-2: 1.
And when the injection rate is more than 30L/min, thickening the prefabricated water-cement ratio to 1.5: 1-2: 1.
And when the injection rate is less than 1L/min, continuously pouring for 10-20 min to finish grouting.
The invention has the following advantages:
1. according to the device, the short pipe body and the long pipe body which are different in length are arranged in a split mode, the grouting holes are formed in the front ends of the short pipe body and the long pipe body, and grouting liquid can be injected into the grouting drilled holes through the short pipe body and the long pipe body respectively, so that grouting is more uniform, a grouting structure is firmer, and meanwhile, the pipe body made of PPR is lower in manufacturing cost and beneficial to energy conservation and environmental protection, and the light-weight characteristic of the PPR is also beneficial to material transportation;
2. be equipped with through formula grout outlet on the nozzle stub body, the accessible grout outlet is direct to be injected into the slip casting drilling inside to evenly fill the slip casting drilling fast, and then by the slip casting hole homodisperse slip casting that sets up on nozzle stub body and the long body, the slip casting hole of two bodies is more, and the dispersion direction is more extensive, can pack the local uneven position in the encryption slip casting drilling better.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly introduced, and the structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the modifications of any structures, the changes of the proportion relationships, or the adjustments of the sizes, without affecting the functions and the achievable purposes of the present invention, and still fall within the scope of the technical contents disclosed in the present invention.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a side view of a mounting structure of an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a mounting structure of an embodiment of the present invention;
FIG. 4 is a schematic diagram of the arrangement of grouting drill holes in the embodiment of the invention;
fig. 5 is a schematic view of a grouting process according to an embodiment of the invention.
In the figure: the grouting device comprises a short pipe body 1, a short pipe grout inlet 11, a grout outlet 12, a short pipe grouting hole 13, a long pipe body 2, a long pipe grout inlet 21, a plugging plate 22, a long pipe grouting hole 23, a grouting drill hole 3 and a tunnel grouting section 4.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a pipe for grouting, including a short pipe body 1 and a long pipe body 2 which are separately arranged, where the short pipe body 1 and the long pipe body 2 are both made of PPR materials with high compression resistance and corrosion resistance, and the front ends of the short pipe body 1 and the long pipe body 2 are both provided with grouting holes which are uniformly arranged, so as to inject grouting liquid into a grouting drilled hole 3 through the short pipe body 1 and the long pipe body 2 with different lengths, respectively, thereby achieving more uniform grouting and firmer grouting structure, and meanwhile, the manufacturing cost of using the PPR material is lower, which is beneficial to energy saving and environmental protection, and the light weight of the PPR material is also beneficial to material transportation. The specific settings are as follows:
the one end of short body 1 is equipped with and is used for letting in the inside nozzle stub grout inlet 11 of body with the slip casting liquid, and the other end of short body 1 is equipped with grout outlet 12 for directly pour into the slip casting drilling 3 inside through grout outlet 12, with even filling slip casting drilling 3 fast, a plurality of nozzle stub grout holes 13 have evenly been arranged on the one third pipe wall that is close to 12 one end of grout outlet to short body 1, be used for through nozzle stub grout holes 13 homodisperse slip casting, fill the partial inhomogeneous slip casting position in the slip casting drilling 3.
The one end of long body 2 is equipped with and is used for letting in the injected liquid into the inside long tube grout inlet 21 of body, and the other end an organic whole of long body 2 is equipped with the shutoff board 22 that is used for blockking the direct outflow of injected liquid, long body 2 evenly is equipped with a plurality of long tube grout holes 23 on the third pipe wall that is close to shutoff board 22 one end for through long tube grout hole 23 in coordination with nozzle stub grout hole 13 dispersion slip casting, the injected hole of two bodies is more, and the dispersion direction is more extensive, can pack the local uneven part in the encryption slip casting drilling 3 better.
It should be noted that the length range of the short pipe body 1 is 2.5-4 m, the length range of the long pipe body 2 is 4-5.5 m, and the aperture ranges of the short pipe body 1 and the long pipe body 2 are 18-22 mm.
The grouting construction method of the pipe for grouting comprises the following steps:
1) flexibly adjusting the specific position of the grouting drill hole 3 according to the underground water condition, the rock stratum fracture condition and the effective diffusion radius of the grouting liquid and combining the actual water outlet condition, wherein the aperture of the grouting drill hole 3 is 50mm, and the depth range of the grouting drill hole 3 is 4.5-6 m;
when the surface of the surrounding rock is complete and the grouting drill holes 3 cannot be drilled according to the water outlet crack trend, a plurality of water plugging grouting drill holes 3 (refer to fig. 4) are uniformly drilled along the annular direction at the part to be plugged of the grouting section 4 of the tunnel, wherein the annular distance between the orifices of the grouting drill holes 3 is 1.2-1.75 m, 14-20 holes are arranged in each ring, and the row spacing between two adjacent groups of annular grouting drill holes 3 is 1-1.5 m.
2) After the drilling process of the grouting drill hole 3 is finished, immediately carrying out pore flushing operation on the grouting drill hole 3 to remove rock powder remained in the drill hole, clay impurities filled in rock cracks and the like;
the cleaning mode of the grouting drill hole 3 adopts a water discharging mode of sudden pressure rise and sudden pressure decrease, the standard of the flushing end is that the time lasts for 5min after the effluent is clear, and the total flushing time is not less than 20 min;
the cleaning method of the rock cracks of the drill hole adopts high-pressure water to carry out pressurized water washing, the washing water pressure is not more than 1MPa, and the washing is finished after the backwater is clarified;
when the grouting drill hole 3 in grouting is in the adjacent position or the drilling time close to the grouting drill hole 3 is less than 12 hours, the flushing operation is not carried out; and (4) re-sweeping and flushing the grouting drill holes 3 which are not grouted within 24h after flushing the holes.
3) The inner wall of the grouting drill hole 3 is provided with water with different sizes after drilling, in order to achieve the water plugging and grouting effect, one end of the short pipe body 1 and the long pipe body 2 made of PPR materials, which is provided with the grouting hole, extends into the grouting drill hole 3, the short pipe body 1 is reserved outside the grouting drill hole 3 for 50mm, the long pipe body 2 is reserved outside the grouting drill hole 3 for 60mm, and the grouting drill hole 3 is further plugged in the hole opening at the outer part of the short pipe body 1 and the long pipe body 2, so that the preset compression resistance effect is achieved, and the grouting and water plugging are facilitated.
4) Respectively injecting prefabricated grouting liquid into a short pipe grout inlet 11 of a short pipe body 1 and a long pipe grout inlet 21 of a long pipe body 2, gradually diffusing and filling the grouting liquid in the short pipe body 1 into a grouting drill hole 3 from a grout outlet 12 and a short pipe grouting hole 13, gradually diffusing and filling the grouting liquid in the long pipe body 2 into the grouting drill hole 3 from a long pipe grouting hole 23, uniformly filling the grouting liquid at the bottom of the grouting drill hole 3 and reaching a preset balance, gradually extruding the grouting liquid to one end of an orifice of the grouting drill hole 3, wherein the grouting liquid adopts P.O42.5-grade silicate cement with the water-cement ratio not lower than 1:1, and the grouting pressure is 1.5-5.0 MPa;
when the grouting pressure is kept unchanged and the injection rate is continuously reduced, or when the grouting pressure is continuously increased without changing the injection rate, the prefabricated water-cement ratio is not changed;
when the injection amount of the grouting liquid in the short pipe body 1 or the long pipe body 2 reaches more than 300L, or the injection time reaches 30min, and the grouting pressure and the injection rate are not changed or are not changed remarkably, the prefabricated water-cement ratio is changed to 1.5: 1-2: 1;
when the injection rate is more than 30L/min, thickening the prefabricated water-cement ratio to 1.5: 1-2: 1;
and when the injection rate is less than 1L/min, continuously pouring for 10-20 min to finish grouting.
5) After the grouting is finished, standing is not less than 24 hours, after the cement reaches the preset design strength, the short pipe body 1 and the long pipe body 2 exposed outside the grouting drill hole 3 are cut off, and the inside of the short pipe body 1 and the inside of the long pipe body 2 are still filled with the cement to stabilize the strength of the pipe body.
6) And (3) carrying out secondary local plugging and encryption on the plane where the orifice of the grouting drill hole 3 is located, so that the uneven orifice end surface of the grouting drill hole 3 caused by grouting pressure change returns to a flat state again.
For some exception handling measures:
1. grouting interruption treatment: grouting must be carried out continuously, if the interruption time is forced to exceed 30min due to construction reasons, drilling and flushing should be carried out; if the flushing is ineffective, the cleaning holes are cleaned.
When grouting is resumed, if the injection rate is 90% or more before interruption, the water-cement ratio of the cement paste before interruption can be adopted for continuous grouting; if the injection rate is 70-90% before interruption, gradually adding the concentrated slurry to continue injection; if the injection rate is less than 70% before interruption and slurry suction is stopped in a short time, the section of grouting is regarded as unqualified, and hole cleaning and hole re-grouting are needed.
2. Carrying out slurry stringing, slurry bleeding and slurry leakage treatment: when slurry leakage and slurry leakage are found in the grouting process, caulking, surface plugging, low pressure, thick slurry, flow limiting, quantity limiting, intermittence, waiting for coagulation and other methods are adopted to treat the slurry according to specific conditions. The filling can be continued if water or slurry is leaked. If the slurry leaks, the grouting pressure is reduced until the slurry leaks, and then the pressure is gradually increased to the original grouting pressure for continuous grouting. If the pressure reduction is ineffective and then the slurry is thickened, if the pressure reduction and thickening are ineffective and the slurry leakage amount is close to the injection amount, the grouting is stopped for coagulation, and the coagulation time is not less than 8 hours; if the slurry suction amount is close to zero after grouting is resumed or slurry suction is stopped, the section is taken as an unqualified hole section and is treated according to the situation.
When slurry mixing occurs in the grouting process, if slurry mixing holes have grouting conditions, parallel grouting can be performed, but the number of the parallel grouting holes is not more than 3, otherwise, the slurry mixing holes are plugged, after grouting of the grouting holes is finished, holes are swept and washed beside the slurry mixing holes, and then grouting is continuously performed.
3. And (3) processing the broken rock mass drilling hole: when a special hole section which can not be drilled due to the fact that a broken zone can not form a hole or a rock vein and an influence zone are met in the drilling process and the drilling medium water is lost and the drilling can not be continued is formed, grouting reinforcement treatment can be carried out firstly, and then deep grouting can be carried out by drilling holes beside the special hole section.
4. Unpredictable formation voiding treatments around the hole may be formed due to water gushes. If cavities around the holes appear, the sizes of the cavities are required to be detected, thick cement mortar and double-liquid mortar are respectively adopted for plugging, and the arrangement of the drill holes is actually adjusted according to the conditions of the cavities.
It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.
Claims (1)
1. A grouting construction method of a pipe for grouting is characterized by comprising the following steps:
1) selecting the distribution positions of grouting drill holes according to the condition of leaked water and drilling the holes;
adjusting and selecting the distribution positions of grouting drill holes according to the underground water condition, the rock stratum fracture condition and the effective diffusion radius of grouting liquid and combining the actual leakage water condition, wherein the aperture of each grouting drill hole is 50mm, and the depth range of each grouting drill hole is 4.5-6 m;
when the surface of the surrounding rock is complete and grouting drill holes cannot be drilled according to the water outlet crack trend, uniformly drilling a plurality of water plugging grouting drill holes along the annular direction at the part to be plugged of the grouting section of the tunnel, wherein the annular distance between the orifices of the grouting drill holes is 1.2-1.75 m, 14-20 holes are arranged in each ring, and the row spacing between two adjacent groups of annular grouting drill holes is 1-1.5 m;
2) carrying out pore washing on the grouting drill hole;
after the drilling process of the grouting drilling is finished, immediately carrying out a pore washing process on the grouting drilling;
the cleaning mode of the grouting drilling adopts a water discharging mode of sudden pressure rise and sudden pressure decrease, the standard of the flushing end is that the time lasts for 5min after the effluent is clear, and the total flushing time is not less than 20 min;
the cleaning method of the rock cracks of the drill hole adopts high-pressure water to carry out pressurized water washing, the washing water pressure is not more than 1MPa, and the washing is finished after the backwater is clarified;
when grouting drill holes in grouting are arranged at the adjacent positions or the drill holes close to the grouting drill holes are not finished for less than 12 hours, flushing operation is not carried out; re-flushing the grouting drill hole which is not grouted within 24 hours after the hole is flushed;
3) sequentially embedding the short pipe body and the long pipe body and reserving the short pipe body and the long pipe body, and plugging the orifice parts of the grouting drill holes positioned at the outer sides of the short pipe body and the long pipe body;
the short pipe body and the long pipe body made of PPR materials are stretched into a grouting drill hole, the short pipe body is reserved outside the grouting drill hole for 50mm, and the long pipe body is reserved outside the grouting drill hole for 60 mm;
plugging the orifices of the grouting drill holes on the outer side parts of the short pipe body and the long pipe body;
4) grouting by the short pipe body and the long pipe body;
injecting prefabricated grouting liquid from the grout inlet of the short pipe body and the grout inlet of the long pipe body respectively, gradually diffusing and filling the grouting liquid inside the short pipe body from the grout outlet and the grouting hole to the inside of the grouting drilled hole, gradually diffusing and filling the grouting liquid inside the long pipe body from the long pipe grouting hole to the inside of the grouting drilled hole, and gradually extruding the grouting liquid to one end of the orifice of the grouting drilled hole when the bottom of the grouting drilled hole is uniformly filled with the grouting liquid and reaches a preset balance;
P.O42.5-grade portland cement with a water-cement ratio of not less than 1:1 is adopted as grouting liquid, and the grouting pressure is 1.5-5.0 MPa;
when the grouting pressure is kept unchanged and the injection rate is continuously reduced, or when the grouting pressure is continuously increased without changing the injection rate, the prefabricated water-cement ratio is not changed;
when the injection amount of the grouting liquid in the short pipe body or the long pipe body reaches more than 300L, or the injection time reaches 30min, and the grouting pressure and the injection rate are not changed or are not changed remarkably, the prefabricated water-cement ratio is changed to 1.5: 1-2: 1;
when the injection rate is more than 30L/min, thickening the prefabricated water-cement ratio to 1.5: 1-2: 1;
when the injection rate is less than 1L/min, continuously pouring for 10-20 min to finish grouting;
5) cutting off a short pipe body and a long pipe body which are left outside the grouting drill hole;
after grouting is finished, standing for not less than 24 hours, cutting off the short pipe body and the long pipe body exposed outside the grouting drill hole after cement reaches preset design strength, and filling cement into the pipe bodies of the short pipe body and the long pipe body so as to stabilize the strength of the pipe bodies;
6) the orifice end face of the secondary local encryption grouting drill hole;
and (4) carrying out secondary local plugging and encryption on the plane where the orifice of the grouting drill hole is located, so that the end surface of the orifice of the grouting drill hole which is uneven and caused by the change of grouting pressure returns to a flat state again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935063.9A CN110778331B (en) | 2019-09-29 | 2019-09-29 | Pipe for grouting and grouting construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910935063.9A CN110778331B (en) | 2019-09-29 | 2019-09-29 | Pipe for grouting and grouting construction method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN110778331A CN110778331A (en) | 2020-02-11 |
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| CN104533452B (en) * | 2014-12-05 | 2016-08-24 | 中国矿业大学 | A kind of underground coal mine crushes coal body stagewise grouting strengthening method |
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