CN113236305A - Segmented grouting device with instant slurry mixing function and grouting method - Google Patents
Segmented grouting device with instant slurry mixing function and grouting method Download PDFInfo
- Publication number
- CN113236305A CN113236305A CN202110653018.1A CN202110653018A CN113236305A CN 113236305 A CN113236305 A CN 113236305A CN 202110653018 A CN202110653018 A CN 202110653018A CN 113236305 A CN113236305 A CN 113236305A
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- 239000002002 slurry Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 131
- 239000010959 steel Substances 0.000 claims abstract description 131
- 239000011440 grout Substances 0.000 claims abstract description 45
- 239000011435 rock Substances 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 8
- 230000002787 reinforcement Effects 0.000 abstract description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
A subsection grouting device with instant slurry mixing function and a grouting method comprise a steel sleeve with one end opened and the other end plugged, and a plurality of grouting holes are formed in the circumferential outer wall of the steel sleeve, a slurry spiral mixing pipe is axially inserted into the inner part of the plugged end of the steel sleeve in a sliding and inserting mode, and a plurality of grouting steel pipes communicated with the slurry spiral mixing pipe are axially inserted into the inner part of the opened end of the steel sleeve in a sealing and inserting mode; the grout inlet end of the grouting steel pipe axially extends out of the steel sleeve and is respectively communicated with the pressure flowmeter, the turning joint, the grouting hose and the grouting pump in sequence. The grouting device and the grouting method can control grouting pressure and slurry proportion in real time, can be used for performing surrounding rock grouting reinforcement after tunnel excavation and advanced curtain grouting reinforcement before tunnel excavation, and have the advantages of late double-slurry mixing, high fluidity, long duration, sectional grouting, low cost, simplicity in assembly and the like.
Description
Technical Field
The invention relates to the technical field of grouting construction, in particular to a sectional grouting device with an instant slurry mixing function and a grouting method.
Background
At present, when a tunnel is excavated in a weak stratum, the situation that surrounding rocks are greatly deformed and supporting measures cannot exert effectiveness is often encountered; at present, the common method is to reinforce the soft lithologic area of the tunnel by grouting so that the stratum meets the tunnel excavation and supporting conditions. And the types and parameters of the used slurry are different due to different lithological characters at different positions behind the excavation surface. Reinforcing weak surrounding rock at the present stage, mainly adopting sleeve valve pipe grouting and film bag grouting modes, and keeping the type and parameters of the grout unchanged in the whole grouting process; in addition, when the type of the slurry is selected from the double-liquid slurry, the slurry is injected after being stirred in advance outdoors, and at the moment, although the double-liquid slurry is stirred uniformly, the early mixing of the double-liquid slurry causes the slurry to have reduced fluidity, and the reinforcing effect is not obvious in long-distance and wide-range grouting.
Through published patent searches, the following comparison documents were found:
CN208473929U discloses a double-liquid grouting pipe device for mixing two kinds of grout at the end of an outer pipe body through two guide plates with opposite arc directions, which has simple structure, is convenient and practical, can effectively improve the grouting effect on a goaf, it is characterized in that one end of the connecting sleeve is sleeved on one end of the outer tube body, the outer tube body is formed by connecting a plurality of thick tubes in a threaded manner, threads are arranged on the inner wall of the connecting sleeve, and is in threaded connection with the outer pipe body, the fixing block is arranged in the other end of the connecting sleeve, the fixing ring is arranged outside the fixing block, a sealing ring is arranged between the fixing ring and the other end of the connecting sleeve, a through hole is arranged on the fixing block, and is communicated with the interior of the outer tube body, a second grouting tube penetrates through the through hole on the fixing block, one end of the second grouting tube is arranged in the outer tube body, the inner tube body is arranged in the outer tube body, and one end of the inner pipe body is connected with one end of the second grouting pipe, and the inner pipe body is formed by connecting a plurality of thin pipes in a threaded manner.
Through analysis, the two-fluid grouting pipe device in the patent has larger difference in the structure for preventing slurry from flowing back and the grouting method compared with the application, so that the novelty of the application is not influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sectional grouting device and a grouting method with an instant slurry mixing function, which can control grouting pressure and slurry proportion in real time, can perform surrounding rock grouting reinforcement after tunnel excavation and advanced curtain grouting reinforcement before tunnel excavation, and have the advantages of late double-slurry mixing, high fluidity, long duration, sectional grouting, low cost, simple assembly and the like.
A sectional grouting device with an instant slurry mixing function comprises a steel sleeve with one end opened and the other end plugged, and a plurality of grouting holes formed in the circumferential outer wall, wherein a slurry spiral mixing pipe is axially inserted into the inner part of the plugged end of the steel sleeve in a sliding manner, and a plurality of grouting steel pipes communicated with the slurry spiral mixing pipe are axially inserted into the inner part of the open end of the steel sleeve in a sealing manner; the grout inlet end of the grouting steel pipe axially extends out of the steel sleeve and is respectively communicated with the pressure flowmeter, the turning joint, the grouting hose and the grouting pump in sequence.
And the circumferential inner wall of the steel sleeve is coaxially and fixedly connected with a plurality of grout stopping sheets, and the inner rings of the grout stopping sheets are respectively connected with the circumferential outer walls of the grout spiral mixing pipe and the plurality of grouting steel pipes in a sealing and extruding manner.
The number of the grouting steel pipes is not less than two, a pressure flowmeter is fixedly arranged on each grouting steel pipe, and a turning joint is fixedly connected to the grout inlet end of each grouting steel pipe in a sealing manner; the two ends of the grouting hose are respectively communicated with the grouting pump and the turning joint.
Moreover, the grouting hose is a PVC pipe or a rubber hose.
A grouting method implemented by a sectional grouting device with an instant slurry mixing function comprises the following steps:
the method comprises the following steps: the steel sleeve with holes at two ends is driven into a pre-reinforcing area, the connected slurry mixing spiral pipe and grouting steel pipe combination is inserted into the steel sleeve and is extruded and sealed by a slurry stop sheet, and the slurry outlet end of the slurry mixing spiral pipe is propped against the plugging end face of the steel sleeve; then, the slurry inlet end of the grouting steel pipe is sequentially connected with a pressure flowmeter and a turning joint, a grouting hose is connected to the turning joint, and finally the grouting hose is connected with a grouting pump;
step two: selecting the type of pre-grouting liquid and corresponding pressure and flow, and respectively injecting the grouting liquid into the two grouting steel pipes through two groups of grouting pumps, grouting hoses and turning joints;
step three: grouting the first section of rock stratum, wherein when injected grout is filled in the end part of the steel sleeve and the surrounding rock reinforcing area, the grouting steel pipe has an outward-bouncing tendency due to the increase of internal pressure, and in the process that the combination of the grout mixing spiral pipe and the grouting steel pipe exits from the steel sleeve, after the grout outlet end of the grout mixing spiral pipe passes through the grout stopping sheet, the grout stopping sheet loses the inner support and is automatically closed, so that backflow grout of the steel sleeve at the first section of rock stratum is blocked;
step four: grouting the middle section rock stratum, stopping outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the slurry mixing spiral pipe completely exits the first grout stopping sheet, manually and properly pumping out a part of grouting steel pipe, determining the type and parameters of slurry according to the middle section rock stratum, starting a pump for grouting, and starting outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the pressure of the middle section grouting reaches the requirement;
step five: grouting the last section rock stratum, and repeating the third step and the fourth step until the slurry mixing spiral pipe and the grouting steel pipe combination are separated from the steel sleeve;
step six: and after the whole section of grouting is finished, drawing out the slurry mixing spiral pipe and the grouting steel pipe, and plugging the opening of the slurry inlet end of the steel sleeve.
The invention has the advantages and technical effects that:
the sectional grouting device with the instant slurry mixing function can be used for performing surrounding rock grouting reinforcement construction after tunnel excavation and realizing advanced curtain grouting before tunnel excavation, and has the advantages of multi-grouting steel pipe slurry mixing, high fluidity, long duration, capability of performing sectional grouting according to surrounding rock characteristics, real-time control of grouting flowmeter pressure, low cost, simplicity and easiness in assembly and the like; and the grout stop sheets are arranged at corresponding positions according to the characteristic difference of rock mass around the steel pipe sleeve, so that different grouting types and parameters are selected according to surrounding rock conditions, and the purpose of sectional grouting is achieved; a slurry mixing spiral pipe is arranged at the junction of the two grouting steel pipes to fully stir and mix the two slurries, and the mixed slurry flows out from the end part of the spiral pipe and then is injected into a rock stratum through an opening of the steel sleeve; the pressure flowmeter can monitor the injection pressure and flow of the grouting steel pipe in real time.
Drawings
FIG. 1 is a schematic view of the sectional grouting apparatus according to the present invention;
FIG. 2 is a partial view of the structure of the grout stop of the present invention (the closed attitude of the grout stop);
FIG. 3 is a schematic view of a slurry mixing screw configuration according to the present invention;
in the figure: 1-steel casing pipe; 2-slurry spiral mixing pipe; 3-grouting the steel pipe; 4-a grout stopping sheet; 5-a pressure flow meter; 6-a turning joint; 7-grouting flexible pipe; 8-grouting pump.
Detailed Description
For a further understanding of the contents, features and effects of the present invention, reference will now be made to the following examples, which are to be considered in conjunction with the accompanying drawings. It should be noted that the present embodiment is illustrative, not restrictive, and the scope of the invention should not be limited thereby.
A sectional grouting device with an instant slurry mixing function comprises a steel sleeve 1, one end of which is open, the other end of which is blocked and the circumferential outer wall of which is provided with a plurality of grouting holes, wherein a slurry spiral mixing pipe 2 is axially inserted into the blocking end of the steel sleeve in a sliding manner, and a plurality of grouting steel pipes 3 communicated with the slurry spiral mixing pipe are axially inserted into the opening end of the steel sleeve in a sealing manner; the grout inlet end of the grouting steel pipe axially extends out of the steel sleeve and is respectively communicated with the pressure flowmeter 5, the turning joint 6, the grouting hose 7 and the grouting pump 8 in sequence.
And, the coaxial rigid coupling has a plurality of only thick liquid pieces 4 on the circumference inner wall of steel casing, and the inner circle of only thick liquid piece is connected with the sealed extrusion of the circumference outer wall of thick liquid spiral mixing tube and many slip casting steel pipes respectively.
The number of the grouting steel pipes is not less than two, a pressure flowmeter is fixedly arranged on each grouting steel pipe, and a turning joint is fixedly connected to the grout inlet end of each grouting steel pipe in a sealing manner; the two ends of the grouting hose are respectively communicated with the grouting pump and the turning joint.
Moreover, the grouting hose is a PVC pipe or a rubber hose.
A grouting method implemented by a sectional grouting device with an instant slurry mixing function comprises the following steps:
the method comprises the following steps: the steel sleeve with holes at two ends is driven into a pre-reinforcing area, the connected slurry mixing spiral pipe and grouting steel pipe combination is inserted into the steel sleeve and is extruded and sealed by a slurry stop sheet, and the slurry outlet end of the slurry mixing spiral pipe is propped against the plugging end face of the steel sleeve; then, the slurry inlet end of the grouting steel pipe is sequentially connected with a pressure flowmeter and a turning joint, a grouting hose is connected to the turning joint, and finally the grouting hose is connected with a grouting pump;
step two: selecting the type of pre-grouting liquid and corresponding pressure and flow, and respectively injecting the grouting liquid into the two grouting steel pipes through two groups of grouting pumps, grouting hoses and turning joints;
step three: grouting the first section of rock stratum, wherein when injected grout is filled in the end part of the steel sleeve and the surrounding rock reinforcing area, the grouting steel pipe has an outward-bouncing tendency due to the increase of internal pressure, and in the process that the combination of the grout mixing spiral pipe and the grouting steel pipe exits from the steel sleeve, after the grout outlet end of the grout mixing spiral pipe passes through the grout stopping sheet, the grout stopping sheet loses the inner support and is automatically closed, so that backflow grout of the steel sleeve at the first section of rock stratum is blocked;
step four: grouting the middle section rock stratum, stopping outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the slurry mixing spiral pipe completely exits the first grout stopping sheet, manually and properly pumping out a part of grouting steel pipe, determining the type and parameters of slurry according to the middle section rock stratum, starting a pump for grouting, and starting outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the pressure of the middle section grouting reaches the requirement;
step five: grouting the last section rock stratum, and repeating the third step and the fourth step until the slurry mixing spiral pipe and the grouting steel pipe combination are separated from the steel sleeve;
step six: and after the whole section of grouting is finished, drawing out the slurry mixing spiral pipe and the grouting steel pipe, and plugging the opening of the slurry inlet end of the steel sleeve.
To more clearly illustrate the embodiments of the present invention, an example is provided below:
as shown in figure 1, the sectional grouting instant slurry mixing device suitable for tunnel grouting comprises a steel sleeve with a slurry stopping sheet and a slurry mixing spiral pipe; a, slurry injection pump; b, slurry grouting pump; a, grouting a hose with slurry; b, grouting a hose with slurry; a turning joint; a pressure flow meter; a, grouting a steel pipe; b, grouting the steel pipe; the slurry mixing spiral pipe is connected with two grouting steel pipes, and a pressure flowmeter is arranged on each grouting steel pipe and is used for observing grouting pressure and flow change; the other ends of the two grouting steel pipes are respectively connected with a grouting hose through turning joints, and the grouting hose is connected with a grouting pump.
The steel sleeve is made of a quincunx steel pipe with a hole, and the diameter of the steel pipe is determined according to the actual engineering requirement. The slurry mixing spiral pipe is made of an iron pipe, two openings are formed in the end portion of the slurry mixing spiral pipe, the outer diameter of the slurry mixing spiral pipe is slightly smaller than the inner diameter of a steel sleeve, a grouting steel pipe is directly inserted into the slurry mixing spiral pipe, slurry flows into the slurry mixing spiral pipe during grouting, the slurry mixing spiral pipe rotates under the action of pressure, the purpose of stirring the slurry is achieved, and the slurry mixing spiral pipe is made of a mature product in the prior art.
The grouting steel pipe is made of steel, and a pressure flowmeter is arranged near the tail end of the grouting steel pipe and used for observing the injection pressure and the injection quantity of the A/B slurry. The tail ends of the grouting steel pipes are respectively connected with grouting hoses through turning joints, the grouting hoses can be ethylene propylene diene monomer rubber pipes, and the hoses are respectively connected with grouting pumps.
The grouting construction steps are as follows:
the method comprises the following steps: driving the steel sleeve with the hole into a pre-reinforcing area, sequentially connecting a grouting pump, a grouting hose, a turning joint, a pressure flowmeter, a grouting steel pipe and a slurry mixing spiral pipe, extending the slurry mixing spiral pipe to a specified position (generally extending into the top section of the closed end of the steel sleeve), and performing sectional grouting from inside to outside;
step two: selecting pre-grouting liquid and corresponding pressure and flow, and starting a pump for grouting;
step three: if the injected slurry is filled in the end part of the steel sleeve and the surrounding rock reinforcing area, the injected steel pipe has an outward-elastic trend due to the increase of the internal pressure, and after the slurry mixing spiral pipe completely exits from the top end of the steel sleeve, the slurry stop sheet is automatically closed to block the slurry at the top section of the steel perforated pipe;
step four: after the slurry mixing spiral pipe 2 completely exits from the top section of the steel sleeve, stopping the outward bouncing of the spiral pipe and the grouting steel pipe, manually and properly pumping out a part of grouting steel pipe, determining the type and parameters of slurry according to the middle section rock stratum when the end part of the spiral pipe is positioned in the middle of the steel sleeve, and starting a pump for grouting;
step five: after the middle section grouting pressure meets the requirement, the slurry mixing spiral pipe and the grouting steel pipe start to bounce outwards, and the third step and the fourth step are repeated;
step six: and after the whole section of grouting is finished, drawing out the slurry mixing spiral pipe and the grouting steel pipe, and plugging the tail opening of the steel sleeve.
Finally, the invention adopts the mature products and the mature technical means in the prior art.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a segmentation slip casting device with instant thick liquid mixing function which characterized in that: the grouting device comprises a steel sleeve with one end open and the other end plugged, and a plurality of grouting holes are formed in the circumferential outer wall of the steel sleeve, a grout spiral mixing pipe is axially inserted into the plugging end of the steel sleeve in a sliding manner, and a plurality of grouting steel pipes communicated with the grout spiral mixing pipe are axially inserted into the opening end of the steel sleeve in a sealing manner; and the grouting end of the grouting steel pipe axially extends out of the steel sleeve and is respectively communicated with the pressure flowmeter, the turning joint, the grouting hose and the grouting pump in sequence.
2. The sectional grouting device with an instant slurry mixing function according to claim 1, characterized in that: and a plurality of grout stopping sheets are coaxially and fixedly connected to the circumferential inner wall of the steel sleeve, and inner rings of the grout stopping sheets are respectively connected with the circumferential outer walls of the grout spiral mixing pipe and the plurality of grouting steel pipes in a sealing and extruding manner.
3. The sectional grouting device with an instant slurry mixing function according to claim 1, characterized in that: the number of the grouting steel pipes is not less than two, a pressure flowmeter is fixedly arranged on each grouting steel pipe, and a turning joint is fixedly connected to the grout inlet end of each grouting steel pipe in a sealing manner; and two ends of the grouting hose are respectively communicated with the grouting pump and the turning joint.
4. The sectional grouting device with an instant slurry mixing function according to claim 1, characterized in that: the grouting hose is a PVC pipe or a rubber hose.
5. A grouting method using the sectional grouting apparatus with an instant grout mixing function according to claim 1, comprising the steps of:
the method comprises the following steps: the steel sleeve with holes at two ends is driven into a pre-reinforcing area, the connected slurry mixing spiral pipe and grouting steel pipe combination is inserted into the steel sleeve and is extruded and sealed by a slurry stop sheet, and the slurry outlet end of the slurry mixing spiral pipe is propped against the plugging end face of the steel sleeve; then, the slurry inlet end of the grouting steel pipe is sequentially connected with a pressure flowmeter and a turning joint, a grouting hose is connected to the turning joint, and finally the grouting hose is connected with a grouting pump;
step two: selecting the type of pre-grouting liquid and corresponding pressure and flow, and respectively injecting the grouting liquid into the two grouting steel pipes through two groups of grouting pumps, grouting hoses and turning joints;
step three: grouting the first section of rock stratum, wherein when injected grout is filled in the end part of the steel sleeve and the surrounding rock reinforcing area, the grouting steel pipe has an outward-bouncing tendency due to the increase of internal pressure, and in the process that the combination of the grout mixing spiral pipe and the grouting steel pipe exits from the steel sleeve, after the grout outlet end of the grout mixing spiral pipe passes through the grout stopping sheet, the grout stopping sheet loses the inner support and is automatically closed, so that backflow grout of the steel sleeve at the first section of rock stratum is blocked;
step four: grouting the middle section rock stratum, stopping outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the slurry mixing spiral pipe completely exits the first grout stopping sheet, manually and properly pumping out a part of grouting steel pipe, determining the type and parameters of slurry according to the middle section rock stratum, starting a pump for grouting, and starting outward bouncing of the slurry mixing spiral pipe and the grouting steel pipe after the pressure of the middle section grouting reaches the requirement;
step five: grouting the last section rock stratum, and repeating the third step and the fourth step until the slurry mixing spiral pipe and the grouting steel pipe combination are separated from the steel sleeve;
step six: and after the whole section of grouting is finished, drawing out the slurry mixing spiral pipe and the grouting steel pipe, and plugging the opening of the slurry inlet end of the steel sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653018.1A CN113236305A (en) | 2021-06-11 | 2021-06-11 | Segmented grouting device with instant slurry mixing function and grouting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110653018.1A CN113236305A (en) | 2021-06-11 | 2021-06-11 | Segmented grouting device with instant slurry mixing function and grouting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898378A (en) * | 2021-09-21 | 2022-01-07 | 苏州大学 | Method for grouting in long-distance large-diameter top pipe in pipe curtain structure supporting construction |
| CN114704319A (en) * | 2021-11-22 | 2022-07-05 | 中国矿业大学 | Spraying grouting device for underground coal mine filling and grouting method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211692396U (en) * | 2020-03-09 | 2020-10-16 | 华北有色工程勘察院有限公司 | Recoverable double-liquid mixed grouting hole sealing device for deep hole |
| CN111894632A (en) * | 2020-08-03 | 2020-11-06 | 平顶山天安煤业股份有限公司 | Coal rock mass deep hole sectional grouting reinforcement device and reinforcement method |
-
2021
- 2021-06-11 CN CN202110653018.1A patent/CN113236305A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211692396U (en) * | 2020-03-09 | 2020-10-16 | 华北有色工程勘察院有限公司 | Recoverable double-liquid mixed grouting hole sealing device for deep hole |
| CN111894632A (en) * | 2020-08-03 | 2020-11-06 | 平顶山天安煤业股份有限公司 | Coal rock mass deep hole sectional grouting reinforcement device and reinforcement method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113898378A (en) * | 2021-09-21 | 2022-01-07 | 苏州大学 | Method for grouting in long-distance large-diameter top pipe in pipe curtain structure supporting construction |
| CN113898378B (en) * | 2021-09-21 | 2023-06-06 | 苏州大学 | Method for grouting in long-distance large-diameter jacking pipe in pipe curtain structure supporting construction |
| CN114704319A (en) * | 2021-11-22 | 2022-07-05 | 中国矿业大学 | Spraying grouting device for underground coal mine filling and grouting method thereof |
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Application publication date: 20210810 |
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