CN114737997A - Accurate grouting water plugging method suitable for fine sand and silty clay stratum - Google Patents
Accurate grouting water plugging method suitable for fine sand and silty clay stratum Download PDFInfo
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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
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- 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 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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Abstract
A precise grouting water plugging method suitable for fine sand and silty clay strata comprises the following steps: after drilling to the designed depth, withdrawing the drilling rod; installing the grouting pipe (1) into the drill hole; the grouting pipe (1) is provided with a plurality of groups of slurry holes along the circumferential direction of the pipe wall at different heights, the grouting process is divided into different engineering sections according to the different height positions of the grouting holes, the part corresponding to the lowermost grouting hole is a first engineering section, the engineering sections are numbered from bottom to top, the part corresponding to the uppermost grouting hole is an Nth engineering section, N is a positive integer, and N is more than or equal to 3; and sequentially completing grouting construction from the first engineering section to the Nth engineering section from bottom to top in the grouting process. The accurate grouting water plugging method has the advantages that the pressure loss of slurry is small, a grouting channel is not easy to block, and the grouting efficiency is high.
Description
Technical Field
The invention belongs to the field of foundation stabilization, and particularly relates to an accurate grouting water plugging method suitable for fine sand and silty clay strata.
Background
With the rapid development of Chinese economy, rail transit engineering has become an important project for domestic development. Among them, underground engineering construction, especially tunnel construction, faces numerous difficulties of high risk and high technology. For fine sand and silty clay strata, when the geological conditions and the surrounding construction environment are complex, accurate grouting and water plugging become an urgent problem to be solved.
A utility model patent with publication number CN 207315407U (5 months and 4 days in 2018), discloses a fixed point grouting device. The fixed-point grouting device comprises an outer pipe, wherein an inner pipe is arranged in the outer pipe, the outer diameter of the outer pipe is 5-15 mm larger than that of the inner pipe, the outer pipe and the inner pipe both comprise a plurality of sections of PVC pipe units, and the PVC pipe units are fixedly connected by a straight joint; the front end of the outer pipe is connected with a conical tip through a screw thread, one end of the inner pipe, which is positioned in the outer pipe, is an open end, the other end of the inner pipe is connected with a valve outlet end, and the inlet end of the valve is used for connecting a grouting pump pipe; a plurality of groups of holes are formed in the outer pipe at intervals on the L section away from the front end a, and the outer periphery of the outer pipe is wrapped by rubber belts which can be flushed away by low pressure correspondingly to the holes. The grout enters the inner pipe from the grouting machine through the grouting pump pipe, flows out from the foremost end and enters the outer pipe until the conical tip blind end of the foremost end of the outer pipe, flows back to the outer pipe opening section L, flushes the wrapped rubber belt, enters the soil body of the designated section, and realizes fixed-point and quantitative grouting.
According to the grouting method of the fixed-point grouting device, liquid pressure loss exists in the process that grouting liquid flows back to the outer pipe opening section L, a backflow channel is easy to block, and grouting efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problems that the existing fixed point grouting method has large loss of grouting liquid pressure, a grouting channel is easy to block, and the grouting efficiency is low.
In order to solve the technical problems, the invention adopts the following technical scheme:
a precise grouting water plugging method suitable for fine sand and silty clay strata comprises the following steps:
after drilling to the designed depth, withdrawing the drilling rod;
installing a grouting pipe into the drill hole;
the grouting process is divided into different engineering sections according to different height positions of the grouting holes, the part corresponding to the lowermost grouting hole is a first engineering section and is numbered from bottom to top, the part corresponding to the uppermost grouting hole is an Nth engineering section, N is a positive integer, N is more than or equal to 3, and the value of N is selected according to the actual engineering requirements;
and the grouting process is the grouting construction from the first engineering section to the Nth engineering section from bottom to top.
According to the accurate grouting water plugging method, when the construction of the first engineering section is carried out: the inner pipe provided with the jacking pipe is arranged in the grouting pipe, and the lower end of the inner pipe is arranged between the slurry hole at the lowermost end of the grouting pipe and the slurry hole at the next lower end; the upper end of the inner pipe is connected with a slurry supply pipe, and the slurry supply pipe is connected with a feeding pump. Under the action of the feed pump, slurry enters the inner pipe from the slurry supply pipe; and the slurry flows out from the lower end of the inner pipe and enters the stratum through the slurry hole at the lowermost end of the grouting pipe, so that the grouting of the first engineering section is completed.
And (3) after stopping grouting, performing construction of a second engineering section: moving the inner pipe upwards to enable the lower end of the inner pipe to be arranged between the slurry hole at the next lower end of the grouting pipe and the slurry hole adjacent to the upper portion of the inner pipe, and enabling slurry to enter the inner pipe from the slurry supply pipe under the action of the feed pump; and the slurry flows out from the lower end of the inner pipe and enters the stratum through the slurry hole at the secondary lower end of the grouting pipe, so that the grouting of the second engineering section is completed.
And repeating the process until the construction of the Nth engineering section is completed.
Furthermore, according to the accurate grouting water plugging method, in order to ensure the construction quality and prevent the slurry injected into the stratum from reversely pouring into the grouting pipe to plug the grouting hole, a sealing device is arranged between the upper part of the inner pipe and the grouting pipe. Before grouting, the sealing device is rotated in the forward direction to seal a gap between the upper part of the inner pipe and the grouting pipe; after grouting is finished, the sealing device is rotated reversely, sealing between the inner pipe and the grouting pipe is relieved, and the inner pipe is convenient to move.
In the grouting process, in order to prevent the slurry flowing out from the lower end of the inner pipe from being poured into the grouting pipe upwards to block the upper grouting hole, the lower part of the inner pipe is provided with an elastic material stopping sealing element. The elastic material stopping sealing element is used for sealing a gap between the lower part of the inner pipe and the grouting pipe, so that a closed cavity is formed between the elastic material stopping sealing element and the grouting pipe, the pressure in the cavity can be increased, and the grouting efficiency is improved.
Further, in the construction process of the first engineering section, after the inner pipe is installed in place, the sealing device is rotated in the forward direction, so that a gap between the upper part of the inner pipe and the grouting pipe is sealed; and the slurry flows out from the lower end of the inner pipe, then enters the cavity formed between the lower part of the grouting pipe and the elastic material stopping sealing element, and finally enters the stratum through the slurry hole at the lowest end of the grouting pipe to complete the grouting of the first engineering section.
In the construction process of the second engineering section, the sealing device is rotated reversely, the inner pipe is moved upwards, the lower end of the inner pipe is placed between the slurry hole at the secondary lower end of the grouting pipe and the slurry hole adjacent to the upper part of the grouting pipe, and the sealing device is rotated forwardly to seal a gap between the upper part of the inner pipe and the grouting pipe; and the slurry flows out from the lower end of the inner pipe, then enters the cavity formed between the lower part of the grouting pipe and the elastic material stopping sealing element, and finally enters the stratum through the slurry hole at the secondary lower end of the grouting pipe to complete the grouting of the second engineering section.
Repeating the process, when in the Nth engineering section, firstly, reversely rotating the sealing device, moving the inner pipe upwards to enable the lower end of the inner pipe to be arranged between the sealing device and the upper part of the slurry hole of the engineering section where the grouting pipe is located, and positively rotating the sealing device to enable the gap between the upper part of the inner pipe and the grouting pipe to be sealed; the slurry flows out from the lower end of the inner pipe, then enters a cavity formed between the lower part of the grouting pipe and the elastic material stopping sealing element, and finally enters the stratum through a slurry hole of the Nth engineering section of the grouting pipe to finish the grouting of the Nth engineering section; and (5) reversely rotating the sealing device, removing the inner pipe from the grouting pipe, and completing construction of all engineering sections.
According to the accurate grouting water plugging method, the sealing device comprises: the sealing device comprises an active sealing element, a passive sealing element, a first convex ring, a second convex ring, a first concave ring and a second concave ring.
The upper part of the inner pipe is provided with an active sealing element and a passive sealing element, and the inner wall of the active sealing element is in threaded connection with the outer wall of the inner pipe. A first protruding ring is arranged on the outer side of the bottom of the driving sealing element, and a first recessed ring is arranged on the inner side of the bottom of the driving sealing element. And a second concave circular ring is arranged at the top of the grouting pipe, and a second convex circular ring is arranged on the inner side of the top of the passive sealing element. The first protruding ring and the second recessed ring are matched with each other, and the first recessed ring and the second protruding ring are matched with each other. The passive sealing element is provided with a force transmission shoulder, the top of the grouting pipe is provided with a force bearing shoulder, a spring groove is formed in the force bearing shoulder, a buffer element is arranged in the spring groove, the upper portion and the lower portion of the buffer element are provided with a first spring, and the force transmission shoulder can be matched with the buffer element.
The driving sealing element is rotated in the forward direction to move towards the bottom of the drill hole along the inner pipe, the driving sealing element compresses the driven sealing element and enables the first spring on the buffering element to be compressed, the force transmission shoulder extrudes the force bearing shoulder, the first protruding circular ring enters the second recessed circular ring, and the second protruding circular ring enters the first recessed circular ring to seal a gap between the inner pipe and the grouting pipe.
The active sealing element is rotated reversely, so that the gap sealing between the inner pipe and the grouting pipe can be released, and the position of the inner pipe is moved.
According to the accurate grouting water plugging method, in order to ensure the smoothness of the slurry hole, a slurry hole cover plate is arranged outside the slurry hole and prevents impurities from entering the grouting hole in a non-grouting state; the slurry hole cover plate can be opened outwards in a grouting state, and slurry can smoothly enter a stratum through the grouting holes.
Furthermore, the two sides of the slurry hole cover plate are provided with a second spring, holes are formed in the fixed hemispheres, the end portions of the second springs penetrate through the holes to be connected with the limiting balls, and the diameter of each hole is smaller than that of each limiting ball. And the second spring is in a tensioning state, and the slurry hole cover plate is sealed to cover the slurry hole. In the grouting process, under the action of the elastic material stopping sealing element, a closed cavity is formed between the lower part of the grouting pipe and the elastic material stopping sealing element, slurry in the cavity is ejected out of the slurry hole cover plate under pressure, and the slurry enters the stratum from the slurry hole to complete grouting.
Compared with the prior art, the accurate grouting water plugging method suitable for the fine sand and silty clay stratum has the beneficial effects of small pressure loss of slurry, difficult blockage of a grouting channel, high grouting efficiency and the like.
Because the sealing device is arranged, the gap between the upper part of the inner pipe and the grouting pipe is sealed, and the slurry injected into the stratum is prevented from reversely pouring into the grouting pipe to block a grouting hole, so that the construction quality is ensured.
Among the sealing device, set up the bolster, alleviateed the vibration that the slip casting pipe bore at the slip casting in-process, prevented that it from taking place offset because the atress is uneven at the slip casting in-process.
The lower part of the inner pipe is provided with an elastic material stopping sealing element, so that in the grouting process, slurry flowing out of the lower end of the inner pipe can be prevented from being poured into the grouting pipe upwards to block the upper grouting hole; in addition, the elastic material stopping sealing element is used for sealing a gap between the lower part of the inner pipe and the grouting pipe, so that a closed cavity is formed between the elastic material stopping sealing element and the grouting pipe, the pressure in the cavity can be increased, and the grouting efficiency is improved.
The arrangement mode of the slurry hole cover plate ensures that the slurry hole is smooth. The slurry hole cover plate prevents impurities from entering the slurry injection hole in a non-slurry injection state; the slurry hole cover plate can be opened outwards in a grouting state, and slurry can smoothly enter a stratum through the grouting holes. And the slurry hole cover plate has an automatic reset function after the grouting is finished, so that the accuracy of the grouting is ensured.
Drawings
Fig. 1 is a schematic structural diagram of an accurate grouting water plugging device involved in the accurate grouting water plugging method applicable to fine sand and silty clay strata according to the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is an enlarged view of a portion B in fig. 1.
In the figure:
1-grouting pipe; 2-jacking pipe; 3-inner tube; 4-slurry supply pipe; 5-a feed pump; 6-active seal; 7-passive seal; 8, a first convex ring; 9-concave ring one; 10-a concave circular ring II; 11-a second convex ring; 12-force transmission shoulder; 13-bearing shoulder; 14-spring slot; 15-buffer; 16-spring one; 17-elastic material-stopping sealing element; 18-slurry hole cover plate; 19-spring two; 20-a limit ball; 21-fixed hemisphere.
Detailed Description
The invention is further illustrated by the following figures and examples.
A precise grouting water plugging method suitable for fine sand and silty clay strata comprises the following steps:
and (5) after drilling to the designed depth, withdrawing the drilling rod.
The grout pipe 1 is installed into the drilled hole.
The grouting pipe 1 is characterized in that a plurality of groups of slurry holes are formed in the circumferential direction of the pipe wall at different heights, the grouting process is divided into different engineering sections according to the height positions of the grouting holes, the part corresponding to the lowermost grouting hole is a first engineering section and is numbered from bottom to top, the part corresponding to the uppermost grouting hole is an Nth engineering section, N is a positive integer, N is not less than 3, and the value of N is selected according to the actual engineering requirements.
Firstly, the construction of a first engineering section is carried out:
as shown in fig. 1, an inner pipe 3 provided with a jacking pipe 2 is arranged in a grouting pipe 1, and the lower end of the inner pipe 3 is arranged between a slurry hole at the lowermost end and a slurry hole at the next lower end of the grouting pipe 1; the upper end of the inner tube 3 is connected to a slurry supply pipe 4, and the slurry supply pipe 4 is connected to a feed pump 5.
A sealing device is arranged between the upper part of the inner tube 3 and the grouting tube 1. Fig. 2 shows a specific structure of the sealing device. The sealing device includes: the sealing device comprises an active sealing element 6, a passive sealing element 7, a first convex ring 8, a second convex ring 11, a first concave ring 9 and a second concave ring 10.
An active sealing element 6 and a passive sealing element 7 are arranged at the upper part of the inner tube 3, the inner wall of the active sealing element 6 is in threaded connection with the outer wall of the inner tube 3, a convex circular ring I8 is arranged on the outer side of the bottom of the active sealing element 6, and a concave circular ring I9 is arranged on the inner side of the bottom of the active sealing element 6; the top of the grouting pipe 1 is provided with a second sunken ring 10, the inner side of the top of the passive sealing element 7 is provided with a second raised ring 10, the first raised ring 8 is matched with the second sunken ring 10, and the first sunken ring 9 is matched with the second raised ring 11. The passive sealing element 7 is provided with a force transmission shoulder 12, the top of the grouting pipe 1 is provided with a force bearing shoulder 13, a spring groove 14 is formed in the force bearing shoulder 13, a buffer element 15 is arranged in the spring groove 14, the upper portion and the lower portion of the buffer element 15 are both provided with a first spring 16, and the force transmission shoulder 12 can be matched with the buffer element 15.
Before grouting, the driving sealing element 6 is rotated in the forward direction to move towards the bottom of the drill hole along the inner pipe 3, the driving sealing element 6 presses the driven sealing element 7 and compresses the first spring 16 on the buffer element 15, the force transmission shoulder 12 presses the force bearing shoulder 13, the first raised circular ring 8 enters the second recessed circular ring 10, the second raised circular ring 11 enters the first recessed circular ring 9, and a gap between the inner pipe 3 and the grouting pipe 1 is sealed.
The sealing device can prevent the slurry injected into the stratum from reversely pouring into the grouting pipe to block the grouting hole.
The lower part of the inner tube 3 is provided with an elastic material stop seal 17, as shown in fig. 3. The elastic material stopping sealing element 17 is used for sealing a gap between the lower part of the inner pipe 3 and the grouting pipe 1, so that a cavity is formed between the elastic material stopping sealing element 17 and the grouting pipe 1, the slurry is prevented from being upwards poured into the grouting pipe to block an upper grouting hole, meanwhile, the pressure in the cavity can be increased, and the grouting efficiency is improved.
As shown in fig. 3, a slurry hole cover plate 18 is arranged outside the slurry hole, and the slurry hole cover plate 18 prevents impurities from entering the slurry hole in a non-slurry-injecting state, so that the slurry hole can be protected to be smooth; the grouting hole can be opened outwards in the grouting state, and the slurry can smoothly enter the stratum through the grouting hole.
Two sides of the slurry hole cover plate 18 are provided with a second spring 19, a hole is formed in the fixed hemisphere 21, the end portion of the second spring 19 penetrates through the hole to be connected with the limiting ball 20, and the diameter of the hole is smaller than that of the limiting ball 20. The second spring 19 is in a tension state, and the slurry hole cover plate 18 is sealed to cover the slurry hole.
During grouting, under the action of a feeding pump 5, slurry enters the inner pipe 3 from the slurry supply pipe 4; and the slurry flows out from the lower end of the inner pipe 3 and then enters a cavity formed between the lower part of the grouting pipe 1 and the elastic material stopping sealing element 17, the slurry in the cavity is ejected out of the slurry hole cover plate 18 under pressure, and the slurry enters the stratum from the slurry hole to complete the grouting of the first engineering section.
And (3) after stopping grouting, performing construction of a second engineering section: firstly, reversely rotating the active sealing element 6, moving the inner tube 3 upwards to enable the lower end of the inner tube 3 to be placed between the slurry hole at the lower end of the grouting tube 1 time and the adjacent slurry hole at the upper part of the grouting tube, and forwardly rotating the active sealing element 6 to enable the gap between the upper part of the inner tube 3 and the grouting tube 1 to be sealed; and the slurry flows out from the lower end of the inner pipe 3, then enters the cavity formed between the lower part of the grouting pipe 1 and the elastic material stopping sealing element 17, and finally enters the stratum through the slurry hole at the lower end of the grouting pipe for 1 time, so that the grouting of the second engineering section is completed.
Repeating the process, when in the Nth engineering section, firstly, reversely rotating the active sealing element 6, moving the inner pipe 3 upwards to enable the lower end of the inner pipe 3 to be arranged between the upper part of the slurry hole of the engineering section where the grouting pipe 1 is located and the sealing device, and positively rotating the active sealing element 6 to enable the gap between the upper part of the inner pipe 3 and the grouting pipe 1 to be sealed; and the slurry flows out from the lower end of the inner pipe 3, then enters the cavity formed between the lower part of the grouting pipe 1 and the elastic material stopping sealing element 17, and finally enters the stratum through the slurry hole of the Nth engineering section of the grouting pipe 1, so that the grouting of the Nth engineering section is completed. And (4) reversely rotating the sealing device, and removing the inner pipe 3 from the grouting pipe 1 to complete the construction of all engineering sections.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the scope of the present invention. Many alternatives and variations will be apparent to those skilled in the art. Any changes, equivalents or improvements that come within the spirit and principle of the invention are intended to be embraced therein.
Claims (9)
1. A precise grouting water plugging method suitable for fine sand and silty clay strata comprises the following steps:
after drilling to the designed depth, withdrawing the drilling rod;
installing the grouting pipe (1) into the drill hole;
the grouting pipe (1) is provided with a plurality of groups of slurry holes along the circumferential direction of the pipe wall at different heights, the grouting process is divided into different engineering sections according to the different height positions of the grouting holes, the part corresponding to the lowermost grouting hole is a first engineering section which is numbered from bottom to top, the part corresponding to the uppermost grouting hole is an Nth engineering section, N is a positive integer, N is more than or equal to 3, and the value of N is selected according to the actual engineering requirement;
and the grouting process is the grouting construction from the first engineering section to the Nth engineering section from bottom to top.
2. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 1, characterized in that:
and (3) carrying out construction of a first engineering section: an inner pipe (3) provided with a jacking pipe (2) is arranged in a grouting pipe (1), and the lower end of the inner pipe (3) is arranged between a slurry hole at the lowest end of the grouting pipe (1) and a slurry hole at the next lower end; the upper end of the inner pipe (3) is connected with a slurry supply pipe (4), and the slurry supply pipe (4) is connected with a feeding pump (5);
under the action of a feeding pump (5), pulp enters the inner pipe (3) from the pulp supply pipe (4); the slurry flows out from the lower end of the inner pipe (3) and enters the stratum through the slurry hole at the lowest end of the grouting pipe (1) to complete the grouting of the first engineering section;
and (3) after stopping grouting, performing construction of a second engineering section: the inner pipe (3) is moved upwards, the lower end of the inner pipe (3) is placed between the slurry hole at the secondary lower end of the grouting pipe (1) and the adjacent slurry hole at the upper part of the grouting pipe, and slurry enters the inner pipe (3) from the slurry supply pipe (4) under the action of the feed pump (5); the slurry flows out from the lower end of the inner pipe (3) and enters the stratum through the slurry hole at the secondary lower end of the grouting pipe (1) to complete the grouting of the second engineering section;
and repeating the process until the construction of the Nth engineering section is completed.
3. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 2, characterized in that:
a sealing device is arranged between the upper part of the inner pipe (3) and the grouting pipe (1), and before grouting, the sealing device is rotated in the forward direction to seal a gap between the upper part of the inner pipe (3) and the grouting pipe (1) and prevent slurry injected into a stratum from reversely pouring into the grouting pipe to block a grouting hole; after grouting is finished, the sealing device is rotated reversely, the sealing between the inner pipe (3) and the grouting pipe (1) is released, and the inner pipe (3) is convenient to move.
4. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 3, characterized in that:
the lower part of inner tube (3) is provided with elasticity and ends material sealing member (17), and elasticity ends material sealing member (17) and is used for the gap seal between inner tube (3) lower part and slip casting pipe (1), makes elasticity end and forms the cavity between material sealing member (17) and slip casting pipe (1), prevents that the thick liquids from upwards pouring into the slip casting pipe, blocks up upper portion slip casting hole, and the pressure in the multiplicable cavity again simultaneously improves slip casting efficiency.
5. The accurate grouting water plugging method suitable for the silty sand and silty clay stratum according to claim 4, characterized in that:
in the construction process of a first engineering section, after the inner pipe (3) is installed in place, the sealing device is rotated in the forward direction, so that a gap between the upper part of the inner pipe (3) and the grouting pipe (1) is sealed; the slurry flows out from the lower end of the inner pipe (3), then enters a cavity formed between the lower part of the grouting pipe (1) and the elastic material stopping sealing element (17), and finally enters the stratum through a slurry hole at the lowest end of the grouting pipe (1) to complete the grouting of the first engineering section;
in the construction process of the second engineering section, the sealing device is rotated reversely, the inner pipe (3) is moved upwards, the lower end of the inner pipe (3) is placed between the slurry hole at the secondary lower end of the grouting pipe (1) and the slurry hole adjacent to the upper part of the grouting pipe, and the sealing device is rotated forwardly to seal the gap between the upper part of the inner pipe (3) and the grouting pipe (1); the slurry flows out from the lower end of the inner pipe (3), then enters a cavity formed between the lower part of the grouting pipe (1) and the elastic material stopping sealing element (17), and finally enters the stratum through a slurry hole at the secondary lower end of the grouting pipe (1) to complete the grouting of a second engineering section;
repeating the process, when in the Nth engineering section, firstly reversely rotating the sealing device, moving the inner pipe (3) upwards, placing the lower end of the inner pipe (3) between the sealing device and the upper part of the slurry hole of the engineering section where the grouting pipe (1) is located, and positively rotating the sealing device to seal the gap between the upper part of the inner pipe (3) and the grouting pipe (1); the slurry flows out from the lower end of the inner pipe (3), then enters a cavity formed between the lower part of the grouting pipe (1) and the elastic material stopping sealing element (17), and finally enters the stratum through a slurry hole of the Nth engineering section of the grouting pipe (1) to complete the grouting of the Nth engineering section; and (4) reversely rotating the sealing device, removing the inner pipe (3) from the grouting pipe (1), and completing construction of all engineering sections.
6. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 5, characterized in that:
the sealing device includes: the sealing device comprises an active sealing element (6), a passive sealing element (7), a first convex ring (8), a second convex ring (11), a first concave ring (9) and a second concave ring (10);
an active sealing element (6) and a passive sealing element (7) are arranged at the upper part of the inner pipe (3), the inner wall of the active sealing element (6) is in threaded connection with the outer wall of the inner pipe (3), a raised circular ring I (8) is arranged on the outer side of the bottom of the active sealing element (6), and a recessed circular ring I (9) is arranged on the inner side of the bottom of the active sealing element (6); the top of slip casting pipe (1) is provided with sunken ring two (10), the top inboard of passive sealing member (7) is provided with protruding ring two (11), protruding ring one and sunken ring two (10) are mutually supported, sunken ring one (9) and protruding ring two (11) are mutually supported, passive sealing member (7) are provided with biography power shoulder (12), the top of slip casting pipe (1) is provided with load shoulder (13), be provided with spring groove (14) in load shoulder (13), be provided with bolster (15) in spring groove (14), the upper portion and the lower part of bolster (15) all are provided with spring one (16), it can cooperate with bolster (15) to pass power shoulder (12).
7. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 6, characterized in that:
the driving sealing element (6) is rotated in the forward direction to move towards the bottom of the drill hole along the inner pipe (3), the driving sealing element (6) compresses the driven sealing element (7) and enables a first spring (16) on the buffer element (15) to be compressed, a force transmission shoulder (12) extrudes a force bearing shoulder (13), a first protruding circular ring enters a second recessed circular ring, a second protruding circular ring (11) enters a first recessed circular ring (9), and a gap between the inner pipe (3) and the grouting pipe (1) is sealed;
the active sealing element (6) is rotated reversely, so that the gap sealing between the inner pipe (3) and the grouting pipe (1) can be released, and the position of the inner pipe is moved.
8. The method for precisely grouting and plugging water in the fine sand and silty clay stratum according to any one of claims 1 to 7, wherein:
a slurry hole cover plate (18) is arranged outside the slurry hole, and the slurry hole cover plate (18) prevents impurities from entering the slurry hole in a non-slurry-casting state, so that the slurry hole is protected to be smooth; the grouting hole can be opened outwards in the grouting state, and the slurry can smoothly enter the stratum through the grouting hole.
9. The accurate grouting water plugging method suitable for the fine sand and silty clay stratum according to claim 8, characterized in that:
two sides of the slurry hole cover plate (18) are provided with a second spring (19), a hole is formed in the fixed hemisphere (21), the end part of the second spring (19) penetrates through the hole to be connected with the limiting ball (20), the diameter of the hole is smaller than that of the limiting ball (20), the second spring (19) is in a tensioning state, and the slurry hole cover plate (18) is sealed to cover the slurry hole; in the grouting process, under the action of the elastic material stopping sealing piece (17), a closed cavity is formed between the lower part of the grouting pipe (1) and the elastic material stopping sealing piece (17), slurry in the cavity is ejected out of the slurry hole cover plate (18) under pressure, and the slurry enters the ground layer from the slurry hole to complete grouting.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115839244A (en) * | 2023-02-13 | 2023-03-24 | 中铁五局集团电务工程有限责任公司 | Short-distance subway shield tunnel crossing operation supporting equipment and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115839244A (en) * | 2023-02-13 | 2023-03-24 | 中铁五局集团电务工程有限责任公司 | Short-distance subway shield tunnel crossing operation supporting equipment and method |
| CN115839244B (en) * | 2023-02-13 | 2023-04-18 | 中铁五局集团电务工程有限责任公司 | Short-distance subway shield tunnel crossing operation supporting equipment and method |
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