CN111021380B - Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof - Google Patents
Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof Download PDFInfo
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- CN111021380B CN111021380B CN201911242988.1A CN201911242988A CN111021380B CN 111021380 B CN111021380 B CN 111021380B CN 201911242988 A CN201911242988 A CN 201911242988A CN 111021380 B CN111021380 B CN 111021380B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
The invention relates to the technical field of plugging equipment and discloses equipment for plugging a deep foundation pit water-stop curtain leak point by using sodium silicate, which comprises a grouting machine and a water-stop curtain for stopping water, wherein a control box is installed at the output end of the grouting machine, two first hydraulic push rods which are symmetrically distributed are installed on the front surface of the control box, installation pipes are fixedly connected to the separated ends of the two first hydraulic push rods, extension pipes are slidably connected to the inside of the installation pipes, spiral pipes are fixedly connected to the rear ends of the installation pipes, the rear ends of the spiral pipes are fixedly connected with the control box, the equipment for plugging the deep foundation pit water-stop curtain leak point by using the sodium silicate and a using method thereof are provided, a place with smaller filling pressure is selected for grout in a grouting process, the hydraulic pressure of the water leak point outside a foundation pit is considered, the grout easily flows upwards during grouting, a grouting hole is selected below the leak point, and the leak point can be guaranteed to be thoroughly plugged, the whole deep foundation pit quicksand emergency rescue is safer, and the whole method is more efficient and convenient.
Description
Technical Field
The invention relates to the technical field of plugging equipment, in particular to equipment for plugging a leak source of a waterproof curtain of a deep foundation pit by using water glass and a using method thereof.
Background
In the construction process of an underground deep foundation pit with abundant underground water and a stratum mainly comprising a fine sand layer, the quality of the foundation pit waterproof curtain directly determines the safety of a foundation pit and surrounding facilities in the construction process of the foundation pit. In actual work progress, because waterproof curtain construction is discontinuous, local quality defect, different waterproof curtains meet the reason such as punishment are improper, in case waterproof curtain seepage appears in the excavation process of foundation ditch, precipitation in the foundation ditch, the foundation ditch does not descend water outward, under the inside and outside water pressure difference effect, outside high water level water can carry the quicksand and can constantly rush into in the foundation ditch, cause the outside because of the dehydration quicksand formation cavity and the decline of water level, and then influence outside important facility safety. Therefore, the invention discloses a method for quickly plugging by using water glass.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides equipment for plugging a deep foundation pit water-stop curtain leak source by using water glass and a using method thereof, which have the advantages of higher safety, quicker water-stop effect and the like, and solve the problems that once the water-stop curtain leaks in the foundation pit soil-digging process, water in the foundation pit falls, water outside the foundation pit does not fall, and under the action of internal and external water pressure difference, external high-water-level water can carry quicksand to continuously flow into the foundation pit, so that the external important external facility safety is influenced due to the fact that a cavity is formed by the quicksand due to water loss and the water level falls.
(II) technical scheme
In order to achieve the purposes of higher safety and faster water stopping effect, the invention provides the following technical scheme: the equipment for plugging the leakage point of the waterproof curtain of the deep foundation pit by using the sodium silicate comprises a grouting machine and a waterproof curtain for water stopping, wherein a control box is installed at the output end of the grouting machine, two first hydraulic push rods which are symmetrically distributed are installed on the front surface of the control box, and installation pipes are fixedly connected to the separated ends of the two first hydraulic push rods;
an extension pipe is connected inside the installation pipe in a sliding mode, a spiral pipe is fixedly connected to the rear end of the installation pipe, the rear end of the spiral pipe is fixedly connected with the control box, a second hydraulic push rod is installed on the front face of the first hydraulic push rod, a push rod connected with the second hydraulic push rod is arranged on the front face of the first hydraulic push rod, the front end of the extension pipe extends to the outside of the installation pipe and is fixedly connected with a conical grouting head, and one end, away from the second hydraulic push rod, of the push rod is hinged to the rear end of the grouting head;
the front surface of the second hydraulic push rod (7) is provided with a transverse sliding groove (12) corresponding to the push rod (8), a moving plate (13) is connected to the inside of the transverse sliding groove (12) in a sliding manner, and the moving plate (13) is hinged to the rear end of the push rod (8);
a strip-shaped hole (14) is formed in the middle of the push rod (8), and a sliding rod (15) fixedly connected with the second hydraulic push rod (7) is connected to the inner portion of the strip-shaped hole (14) in a sliding mode.
Preferably, the outside fixedly connected with spacing ring of extension pipe rear end, the front end inner wall fixedly connected with of installation pipe has the sealing ring that corresponds with the spacing ring.
Preferably, a sand gushing port is formed in the waterproof curtain, and grouting holes respectively located on two sides of the sand gushing port are formed in the bottom of the waterproof curtain.
Preferably, the height of the grouting hole is one meter lower than that of the sand gushing port, and the distance between the grouting hole and the vertical line of the sand gushing port is one meter.
Preferably, the outer diameter of the grouting head is gradually reduced from front to back.
The invention provides a use method of equipment for plugging a deep foundation pit waterproof curtain leak point by using water glass, which comprises the following steps:
a, finding a water burst point: manually detecting a sand gushing port on the waterproof curtain, and cleaning the position near the sand gushing port by using an excavator to expose the sand gushing port;
b, determining a grouting point: after the step A is finished, punching holes on the waterproof curtain by using an electric drill at the positions of 1m on two sides of the sand gushing port and 1m lower than the sand gushing point, wherein the hole diameter DN20 is determined by the depth of the hole based on the punching of the waterproof curtain, and then two grouting holes can be obtained;
c, grouting position adjustment: adjusting the distance between the two grouting heads according to the positions of the two grouting holes formed in the step B, and controlling the first hydraulic push rod to extend to enable the first hydraulic push rod to be lengthened, so that the distance between the two grouting heads can be adjusted, and the distance between the two grouting heads can be just matched with the two grouting holes formed in the step B for later use;
d, grouting preparation work: the height of the control box is adjusted to descend, so that the two grouting heads are opposite to the grouting holes, then the second hydraulic push rod is controlled to extend, the second hydraulic push rod can push the push rod to rotate when extending, the extension pipe and the grouting heads can be pushed to move when rotating, so that the grouting heads can be inserted into the grouting holes, different hole plugging modes are selected according to the size of a sand gushing hole, when the number of quicksand is large, a cotton quilt is plugged into the sand gushing hole through a steel pipe and is propped against the steel pipe, when the number of the leakages is small, a cotton felt and dry kelp are plugged inside the sand gushing hole through the steel pipe or a steel bar, then the outer side of the water leakage point is manually piled up through a sand bag, and the cotton felt and the cotton quilt plugged in the sand gushing hole are propped against;
e, grouting work: and injecting water glass into a gap on the outer side of the waterproof curtain by a grouting machine through a control box and a grouting head, controlling the grouting pressure to be 0.6-0.8Mpa, adopting pure water glass and cement paste in a ratio of 1:1 in the cement paste to shorten the curing time of the water glass when the water leakage is large, adopting a weight ratio of the water glass to the cement of 1:1 in the cement paste when the water leakage is small, controlling the baume degree of the water glass to be 40% in the cement paste, stopping grouting for a few minutes when the water glass and the cement paste appear when the sand gushing port does not leak water any more, estimating the solidification of the water glass, adding 0.2MPa pressure for a while, and stopping grouting when the paste cannot be continuously injected.
(III) advantageous effects
Compared with the prior art, the invention provides equipment for plugging the leakage point of the waterproof curtain of the deep foundation pit by using water glass and a using method thereof, and the equipment has the following beneficial effects:
1. according to the equipment for plugging the deep foundation pit waterproof curtain leakage point by using the sodium silicate and the using method thereof, the slurry is preferably filled at a position with smaller pressure in the grouting process, and the slurry easily flows upwards in the grouting process considering that the water pressure exists at the leakage point outside the foundation pit. The grouting holes are selected below the leakage points, so that the leakage points can be guaranteed to be thoroughly plugged, and the whole deep foundation pit quicksand emergency rescue is safer.
2. This utilize glass shutoff deep basal pit stagnant water curtain leak source equipment and application method thereof, the slip casting hole of seting up on the stagnant water curtain that can be more accurate corresponds, can seal the convection current sand position more efficiently, whole equipment simple structure, and it is convenient more high-efficient to use, does benefit to and uses widely.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for plugging a leak point of a waterproof curtain of a deep foundation pit by using water glass according to the present invention;
FIG. 2 is a sectional view of A-A in FIG. 1 of a device for plugging a deep foundation pit waterproof curtain leak source by using water glass according to the present invention;
FIG. 3 is an enlarged view of B in FIG. 2 of a device for plugging a deep foundation pit waterproof curtain leak source by using water glass according to the present invention;
FIG. 4 is a distribution diagram of grouting holes on the waterproof curtain according to the present invention.
In the figure: 1. grouting machine; 2. a control box; 3. a first hydraulic push rod; 4. installing a pipe; 5. an extension tube; 6. a spiral tube; 7. a second hydraulic push rod; 8. a push rod; 9. a grouting head; 10. a limiting ring; 11. a seal ring; 12. a transverse chute; 13. moving the plate; 14. a strip-shaped hole; 15. a slide bar; 16. a waterproof curtain; 17. a sand gushing port; 18. and (4) grouting holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-4, a device for plugging a deep foundation pit water-stop curtain leak point by using water glass comprises a grouting machine 1 and a water-stop curtain 16 for stopping water, wherein a control box 2 is installed at the output end of the grouting machine 1, two first hydraulic push rods 3 which are symmetrically distributed are installed on the front surface of the control box 2, installation pipes 4 are fixedly connected to the separated ends of the two first hydraulic push rods 3, the water-stop curtain 16 is installed at a construction position to safely protect a foundation pit and surrounding facilities in the foundation pit construction process, water and gravel are prevented from flowing to the construction position in the excavation process, the safety in the construction process is ensured, the grouting machine 1 can inject the glass water into the control box 2, the control box 2 can buffer the glass water, and the first hydraulic push rods 3 are controlled to stretch and adjust the positions of the two installation pipes 4;
an extension pipe 5 is connected inside the installation pipe 4 in a sliding manner, a spiral pipe 6 is fixedly connected to the rear end of the installation pipe 4, the rear end of the spiral pipe 6 is fixedly connected with the control box 2, a second hydraulic push rod 7 is installed on the front side of the first hydraulic push rod 3, a push rod 8 connected with the second hydraulic push rod 7 is arranged on the front side of the first hydraulic push rod 3, the front end of the extension pipe 5 extends to the outside of the installation pipe 4 and is fixedly connected with a conical grouting head 9, one end, far away from the second hydraulic push rod 7, of the push rod 8 is hinged with the rear end of the grouting head 9, the installation pipe 4 can drive the extension pipe 5 and the grouting head 9 to move synchronously along with the extension and retraction of the first hydraulic push rod 3, the distance between the two grouting heads 9 is adjusted, the distance between the two grouting heads 9 can be just matched with the two grouting holes 18 formed in the step B, and then the height of the control box 2 is adjusted to fall, make two slip casting heads 9 just to the injected hole 18, the extension of second hydraulic ram 7 is controlled again, can push away catch bar 8 and rotate when second hydraulic ram 7 extends, can push away extension pipe 5 and slip casting head 9 and remove when catch bar 8 rotates, make slip casting head 9 can insert in injected hole 18, the junction position that can slip casting head 9 and injected hole 18 again adds the cotton felt of stopper, the leakproofness of slip casting head 9 and injected hole 18 connection is in order to guarantee to cotton quilt or hayma hai grass etc. like this, the glass water in the control box 2 can be injected into injected hole 18 more efficient, avoid glass water extravagant.
Can push away extension pipe 5 and stretch out installation pipe 4 when catch bar 8 rotates, the outside fixedly connected with spacing ring 10 of extension pipe 5 rear end, the sealing ring 11 that the front end inner wall fixedly connected with of installation pipe 4 corresponds with spacing ring 10, extension pipe 5 is in the gliding time of installation pipe 4, the seal that installation pipe 4 and extension pipe 5 are connected can be guaranteed to sealing ring 11 cooperation spacing ring 10, make from control box 2 and spiral pipe 6 enter into the glass water of installation pipe 4 and can not reveal.
The catch bar 8 receives the promotion of second hydraulic pressure push rod 7 and can take place to rotate, the horizontal spout 12 that corresponds with catch bar 8 is seted up in the front of second hydraulic pressure push rod 7, the inside sliding connection of horizontal spout 12 has movable plate 13, movable plate 13 is articulated with the rear end of catch bar 8, bar hole 14 has been seted up at the middle part of catch bar 8, bar hole 14's inside sliding connection has slide bar 15 with 7 fixed connection of second hydraulic pressure push rod, can drive slide bar 15 and slide in bar hole 14 when second hydraulic pressure push rod 7 is flexible, and then change catch bar 8's angle change, this in-process, movable plate 13 slides in horizontal spout 12, can keep catch bar 8's stability, and then can more high-efficient and stable promotion extension pipe 5 and slip casting head 9 remove.
The glass water can be poured into in the waterproof curtain 16 after slip casting head 9 inserts in slip casting hole 18, there is sand gushing mouth 17 on the waterproof curtain 16, slip casting hole 18 that lies in sand gushing mouth 17 both sides respectively is seted up to the bottom of waterproof curtain 16, the height of slip casting hole 18 is than sand gushing mouth 17 highly low one meter, and the length of slip casting hole 18 between the perpendicular line of sand gushing mouth 17 is one meter, the external diameter of slip casting head 9 reduces by preceding to back gradually, conical slip casting head 9 makes it more convenient when inserting in slip casting hole 18.
The invention provides a use method of equipment for plugging a deep foundation pit waterproof curtain leak point by using water glass, which comprises the following steps:
a, finding a water burst point: after the sand gushing port 17 on the waterproof curtain 16 is manually detected, a digging machine is used for cleaning the position near the sand gushing port 17, so that the sand gushing port 17 is exposed;
b, determining a grouting point: after the step A is finished, drilling a hole on the waterproof curtain 16 by using an electric drill at the position of 1m on two sides of the sand gushing port 17 and lower than the sand gushing point by 1m, wherein the hole diameter DN20 is the hole depth based on the drilling of the waterproof curtain 16, and then two grouting holes 18 can be obtained;
c, grouting position adjustment: adjusting the distance between the two grouting heads 9 according to the positions of the two grouting holes 18 formed in the step B, and controlling the first hydraulic push rod 3 to extend to enable the first hydraulic push rod 3 to be lengthened, so that the distance between the two grouting heads 9 can be adjusted, and the distance between the two grouting heads 9 can be just matched with the two grouting holes 18 formed in the step B for later use;
d, grouting preparation work: adjusting the height of the control box 2 to descend, so that the two grouting heads 9 are opposite to the grouting holes 18, then controlling the second hydraulic push rod 7 to extend, pushing the push rod 8 to rotate when the second hydraulic push rod 7 extends, pushing the extension pipe 5 and the grouting heads 9 to move when the push rod 8 rotates, so that the grouting heads 9 can be inserted into the grouting holes 18, selecting different hole plugging modes according to the size of the sand blasting holes 17, having larger leak points, plugging quilts and the like into the sand blasting holes 17 by using steel pipes when the quicksand is more frequent, plugging the insides of the sand blasting holes 17 by using steel pipes or steel bars, plugging felts, dry sea tangles and the like when the leak points are smaller, and then manually piling up the outsides of the water leak points by using sand bags to plug the felts, the quilts and the like plugged in the sand blasting holes 17;
e, grouting work: the water glass is injected into a gap on the outer side of a waterproof curtain 16 by a grouting machine 1 through a control box 2 and a grouting head 9, the grouting pressure is controlled to be 0.6-0.8Mpa, when the water leakage is large, in order to shorten the water glass curing time, the pure water glass and the cement paste are adopted, the cement paste adopts the proportion of 1:1, when the water leakage is small, the cement prize adopts the proportion of 1:1, the baume degree of the water glass is about 40% (the proportion of the water glass to the water is 4: 6), when the water glass and the cement paste appear, the grouting is suspended for a few minutes, after the water glass is estimated to be basically solidified, the pressure filling of about 0.2Mpa is added, and when the paste can not be continuously filled for a while, the grouting is stopped.
The invention has the beneficial effects that: this equipment is when using, and the slip casting hole 18 of seting up on the waterproof curtain 16 that can be more accurate corresponds, can seal the convection current sand position more efficient, and whole equipment structure is simple, and it is convenient more high-efficient to use, does benefit to and uses widely.
When the grouting method works, the first choice of the grout is at a position with lower filling pressure in the grouting process, the fact that water pressure exists at a water leakage point outside a foundation pit is considered, the grout easily flows upwards during grouting is considered, the grouting hole 18 is selected to be below the water leakage point, the water leakage point can be guaranteed to be thoroughly plugged, and the whole deep foundation pit quicksand emergency rescue is safer.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an utilize water glass shutoff deep basal pit stagnant water curtain leak source equipment, includes slip casting machine (1) and stagnant water curtain (16) that are used for the stagnant water, its characterized in that: the output end of the grouting machine (1) is provided with a control box (2), the front surface of the control box (2) is provided with two first hydraulic push rods (3) which are symmetrically distributed, and the separated ends of the two first hydraulic push rods (3) are fixedly connected with mounting pipes (4);
an extension pipe (5) is connected to the inside of the installation pipe (4) in a sliding mode, a spiral pipe (6) is fixedly connected to the rear end of the installation pipe (4), the rear end of the spiral pipe (6) is fixedly connected with the control box (2), a second hydraulic push rod (7) is installed on the front face of the first hydraulic push rod (3), a push rod (8) connected with the second hydraulic push rod (7) is arranged on the front face of the first hydraulic push rod (3), the front end of the extension pipe (5) extends to the outside of the installation pipe (4) and is fixedly connected with a conical grouting head (9), and one end, far away from the second hydraulic push rod (7), of the push rod (8) is hinged to the rear end of the grouting head (9);
the front surface of the second hydraulic push rod (7) is provided with a transverse sliding groove (12) corresponding to the push rod (8), a moving plate (13) is connected to the inside of the transverse sliding groove (12) in a sliding manner, and the moving plate (13) is hinged to the rear end of the push rod (8);
a strip-shaped hole (14) is formed in the middle of the push rod (8), and a sliding rod (15) fixedly connected with the second hydraulic push rod (7) is connected to the inner portion of the strip-shaped hole (14) in a sliding mode.
2. The device for plugging the deep foundation pit waterproof curtain leakage point by using the water glass as claimed in claim 1, wherein a limiting ring (10) is fixedly connected to the outside of the rear end of the extension pipe (5), and a sealing ring (11) corresponding to the limiting ring (10) is fixedly connected to the inner wall of the front end of the installation pipe (4).
3. The device for plugging the leakage point of the waterproof curtain for the deep foundation pit by using the water glass as claimed in claim 1, wherein the waterproof curtain (16) is provided with a sand gushing port (17), and the bottom of the waterproof curtain (16) is provided with grouting holes (18) respectively positioned at two sides of the sand gushing port (17).
4. The equipment for plugging the deep foundation pit waterproof curtain leak source by using the water glass as claimed in claim 3, wherein the height of the grouting hole (18) is lower than the height of the sand gushing port (17) by one meter, and the length between the grouting hole (18) and the vertical line of the sand gushing port (17) is one meter.
5. The equipment for plugging the deep foundation pit waterproof curtain leak source by using the water glass as claimed in claim 1, wherein the outer diameter of the grouting head (9) is gradually reduced from front to back.
6. The use method of the water glass waterproof curtain leak source blocking equipment for the deep foundation pit according to any one of claims 1 to 5, is characterized by comprising the following steps:
a, finding a water burst point: after the sand gushing port (17) on the waterproof curtain is manually detected, a digging machine is used for cleaning the position near the sand gushing port (17), so that the sand gushing port (17) is exposed;
b, determining a grouting point: after the step A is finished, drilling holes on the waterproof curtain (16) by using an electric drill at the positions 1m on two sides of the sand gushing port (17) and 1m lower than the sand gushing point, wherein the hole diameter DN20 is determined by the depth of the holes based on the drilling of the waterproof curtain (16), and then two grouting holes (18) can be obtained;
c, grouting position adjustment: adjusting the distance between the two grouting heads (9) according to the positions of the two grouting holes (18) formed in the step B, and controlling the first hydraulic push rod (3) to extend to enable the first hydraulic push rod (3) to be lengthened, so that the distance between the two grouting heads (9) can be adjusted, and the distance between the two grouting heads (9) can be just matched with the two grouting holes (18) formed in the step B for standby;
d, grouting preparation work: adjusting the height of the control box (2) to descend, so that the two grouting heads (9) are opposite to the grouting holes (18), then controlling the second hydraulic push rod (7) to extend, pushing the push rod (8) to rotate when the second hydraulic push rod (7) extends, pushing the extension pipe (5) and the grouting heads (9) to move when the push rod (8) rotates, so that the grouting heads (9) can be inserted into the grouting holes (18), selecting different hole plugging modes according to the size of the sand gushing holes (17), enabling the leak points to be large, plugging cotton quilts into the sand gushing holes (17) by using steel pipes and jacking the cotton quilts by using the steel pipes when the sand gushing holes (17) are large in sand flow, plugging the cotton quilts and the dry kelp in the sand gushing holes (17) by using the steel pipes or steel bars when the leak points are small, and manually piling the outer sides of the water leakage points by using sand bags, and jacking the cotton quilts plugged in the sand gushing holes (17);
e, grouting work: the water glass is injected into a gap on the outer side of the waterproof curtain (16) through the control box (2) and the injection head (9) by using the injection machine (1), the injection pressure is controlled to be 0.6-0.8Mpa, when the water leakage is large, in order to shorten the curing time of the water glass, the pure water glass and the cement paste are adopted, the proportion of the water glass to the cement paste is 1:1, the water leakage is small, the weight ratio of the water glass to the cement is 1:1, the baume degree of the water glass is 40%, when the sand gushing port (17) does not leak water any more, the water glass and the cement paste are estimated, the injection is suspended for a few minutes, after the water glass is solidified, the injection pressure of 0.2MPa is added for a while, and when the paste cannot be injected continuously, the injection is stopped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911242988.1A CN111021380B (en) | 2019-12-06 | 2019-12-06 | Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof |
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| CN201911242988.1A CN111021380B (en) | 2019-12-06 | 2019-12-06 | Device for plugging deep foundation pit water-stop curtain leakage points by using sodium silicate and using method thereof |
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| CN114875942A (en) * | 2022-06-21 | 2022-08-09 | 中国煤炭地质总局勘查研究总院 | Waterproof curtain gap plugging device and technology based on microbial mineralization |
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| JPH11217824A (en) * | 1998-02-02 | 1999-08-10 | Yamax Corp | Execution method of underground impervious wall |
| CN104929573A (en) * | 2014-12-18 | 2015-09-23 | 安徽恒源煤电股份有限公司 | Casing pressure test method for grouting orifice pipes |
| CN205576937U (en) * | 2016-04-28 | 2016-09-14 | 中国水电基础局有限公司 | Quick plugging device of deep basal pit |
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