CN112144556B - Layered water stopping device and method for preventing and treating confined water side wall inrush of foundation pit depressurization well - Google Patents
Layered water stopping device and method for preventing and treating confined water side wall inrush of foundation pit depressurization well Download PDFInfo
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- CN112144556B CN112144556B CN202011049618.9A CN202011049618A CN112144556B CN 112144556 B CN112144556 B CN 112144556B CN 202011049618 A CN202011049618 A CN 202011049618A CN 112144556 B CN112144556 B CN 112144556B
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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
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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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
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Abstract
The invention relates to a layered water stopping device and a method for preventing and treating confined water side wall inrush of a foundation pit pressure reducing well, wherein the layered water stopping device comprises clay balls and water swelling rings which are filled between a well pipe and a drill hole of the pressure reducing well and are arranged one by one at intervals in the height direction, the water swelling rings are sleeved outside the well pipe and are provided with water swelling materials and waterproof membranes wrapping the water swelling materials, and the waterproof membranes are broken after the water swelling rings are placed in place to expose the water swelling materials; when confined water leaks, the water-swelling material in the water-swelling ring swells when encountering water, so that a vertical water-separating body is formed. Compared with the prior art, the invention can effectively make up for the situation that the seepage-proofing performance of the pressure-reducing well is further improved under the condition that the clay ball sealing quality is unknown, and particularly can directly block the seepage path of the pressure-bearing water under the condition that the sealing effect is poor and the pressure-bearing water leaks and moves upwards along the bottom of the well, thereby eliminating the potential safety hazard caused by the leakage of the pressure-reducing well.
Description
Technical Field
The invention belongs to the technical field of geological engineering, geotechnical engineering and foundation pit engineering, and particularly relates to a layered water stopping device and method for preventing and treating confined water side wall inrush of a foundation pit depressurization well.
Background
The foundation pit dewatering is that when excavating the foundation pit, groundwater level is higher than the excavation bottom surface, and groundwater can constantly permeate the hole in, for guaranteeing that the foundation pit can be under the construction of dry condition, prevents that the slope unstability, basic quicksand, pit bottom uplift, pit bottom piping and foundation bearing capacity descend and the dewatering work of doing. In the dewatering construction operation of modern geotechnical engineering and foundation pit engineering, well point dewatering is a common and important treatment means. And well point dewatering is to arrange a certain number of depressurization wells around the foundation pit before excavation of the foundation pit, and in the excavation process of the foundation pit, corresponding pumping and depressurization are carried out according to the water level condition in the foundation pit. The purpose of the depressurization well is to reduce the underground water pressure in order to extract underground water, wherein the most important thing is that the leakage problem can not be produced, and the leakage can directly influence the normal use of the depressurization well so as to cause the safety and the completion of the foundation pit engineering construction. The clay ball is a material commonly used for hole sealing and seepage prevention in a pressure reducing well, but because the clay ball is positioned between a well bottom, a well pipe and a well wall, the sealing quality of the clay ball is often difficult to control so as to achieve the complete sealing effect, when the sealing quality is not good, pressure-bearing water leaks upwards along the side wall, so that the gushing is seriously caused, and the pressure reducing well cannot play a role in reducing pressure. The applicant of the invention finds that no treatment measure aiming at the side wall leakage problem is taken into consideration in the construction process of the depressurization well at present, and how to overcome the problems of poor clay ball quality and side wall leakage of the depressurization well is urgently needed to be researched.
Disclosure of Invention
The invention aims to provide a layered water stopping device and a method for preventing and treating the gushing of the confined water side wall of a foundation pit depressurization well. The expansion ring expands when meeting water and is tightly attached between the well wall and the well casing under the condition of water seepage, thereby effectively blocking the upward flowing confined water and ensuring that the well wall gushes cannot occur in the excavation process of the foundation pit after the pressure reducing well is finished. The invention can effectively make up for the situation that the anti-seepage performance of the pressure reduction well is further improved under the condition that the clay ball sealing quality is unknown, and particularly can directly block the seepage path of the pressure-bearing water under the condition that the sealing effect is poor and the pressure-bearing water leaks and moves upwards along the well bottom due to the poor sealing quality of the clay ball, thereby eliminating the potential safety hazard caused by the leakage of the pressure reduction well. In the aspect of preventing and treating the problem of sudden surge of the confined water side wall in the pressure reduction well, the method for solving the problem of leakage of the pressure reduction well side wall by using the water-swelling rubber ring is provided, and a new thought can be provided for the foundation pit dewatering construction process.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a layered water stop device for preventing and treating confined water side wall inrush of a foundation pit pressure reduction well, which comprises clay balls and water swelling rings, wherein the clay balls and the water swelling rings are filled between a well pipe and a drilled hole of the pressure reduction well and are arranged at intervals in the height direction;
when confined water leaks, the water-swelling material in the water-swelling ring swells when encountering water, so that a vertical water-separating body is formed.
Preferably, water-swelling circle be the ring shape of level placement, the water proof membrane is a ring section of thick bamboo form to wrap up outside being annular water-swelling material, be equipped with rupture of membranes mechanism between water-swelling material top and the water proof membrane top, be used for placing the back that targets in place at water-swelling circle and break open water proof membrane top round.
Preferably, the inner diameter of the water-swelling ring is matched with the outer diameter of the well pipe, and the outer diameter of the water-swelling ring is matched with the inner diameter of the drilled hole.
Preferably, the water-swellable material is composed of a plurality of water-swellable rubber rings which are overlapped to form a circular ring shape.
Preferably, the water-swellable rubber ring is made of a high-molecular inorganic water-swellable material and rubber.
Further preferably, the water-swellable rubber ring can be a commercially available water-swellable rubber ring.
The general specifications of the water-swellable rubber ring are 40mm and 45mm in outer diameter, 1cm in thickness and 8mm, 10mm, 12mm, 14mm, 16mm and 20mm in inner diameter, and the specification with the smaller inner diameter can be selected in the invention. The water-swelling rubber ring (water-swelling water-stopping ring) can absorb water and swell when meeting water, the swelling rate is more than or equal to 200 percent, the gap between the well pipe and the well wall is compacted by self-swelling, the water-stopping effect can be completely realized, the operation is very flexible and convenient in actual construction, and the labor, the time and the raw materials are saved. In order to prevent the expansion when the expansion is not required, the waterproof material (waterproof film) such as a plastic film is used for wrapping.
Preferably, the membrane breaking mechanism comprises a membrane breaking lead, the membrane breaking lead is provided with a membrane breaking section arranged between the top of the water-swellable material and the waterproof membrane for a circle and a lead section used for leading the membrane breaking lead out of the ground surface, and a plurality of strip-shaped blades are inserted in the membrane breaking section; after the water-swellable ring is placed in place, the blade inserted in the film breaking section is driven to break open the waterproof film on the top of the water-swellable ring by pulling the lead section.
Preferably, the lead section and the blade penetrating through the lead section are wrapped with a lead protective sleeve.
Preferably, the water-swellable ring is further provided with bagged clay balls below, and the bagged clay balls are used as a balance weight to drive the water-swellable ring to enter the space between the well pipe and the drilled hole.
The invention provides a layered water stopping method for preventing and treating confined water side wall inrush of a foundation pit depressurization well, which adopts the device and comprises the following steps:
s1: drilling in a foundation pit project, determining a hole position of a depressurization well, hanging a well pipe, and sealing a well bottom and a well hole by clay balls;
s2: after the sedimentation is stable, sleeving the water-swellable ring on the well pipe and putting the water-swellable ring in place, breaking the waterproof membrane after the water-swellable ring is placed in place, and continuously filling clay balls after the sedimentation is stable;
s3: and repeating the step S2 until the side wall of the well pipe is plugged on the ground surface.
Preferably, the number of the used water-swellable rings is calculated according to the relation between the clay ball settlement rule and the specifications of the water-swellable rings and the length of the well pipe.
The excavation depth of the foundation pit of modern engineering is generally deep, so that the bearing head is high, the problem of leakage of the side wall of the depressurization well is worth paying attention, and therefore reasonable and efficient depressurization well design and working quality are needed. Compared with the prior art, the side wall of the pressure reduction well can be effectively blocked by the water-swelling material before the foundation pit is lowered, the sudden surge of the side wall of the confined water is prevented and prevented when the pressure reduction well works, and the problem that the normal work of the pressure reduction well is influenced due to water seepage and sudden surge caused by poor clay ball blocking quality is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of layered water stopping for preventing and treating gushing on the confined water side wall of a foundation pit depressurization well.
FIG. 2(a) is a schematic cross-sectional view of a water-swellable ring of the invention, and FIG. 2(b) is a schematic cross-sectional view of a section of a water-swellable ring of the invention.
In the figure, 1 is a well pipe, 2 is a clay ball, 3 is a water-swelling ring, 4 is a filling surface, 5 is a ground surface, 6 is a waterproof film, 7 is a water-swelling material, 8 is a blade, 9 is a lead protecting sleeve, and 10 is a broken film lead.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A layered water stopping device for preventing and treating confined water side wall inrush of a foundation pit depressurization well is shown in figure 1, figure 2(a) and figure 2(b), and comprises clay balls 2 and water swelling rings 3 which are filled between a well casing 1 of the depressurization well and a drill hole and are arranged one by one at intervals in the height direction, wherein the water swelling rings 3 are sleeved outside the well casing 1 and are provided with water swelling materials 7 and waterproof membranes 6 wrapping the water swelling materials 7, and the waterproof membranes 6 are broken after the water swelling rings 3 are placed in place, so that the water swelling materials 7 are exposed; when confined water leaks, the water-swelling material 7 in the water-swelling ring 3 swells with water to form a vertical water-separating body.
The pressure reducing well is widely applied to the existing engineering, the casing pipe is welded steel pipe, the diameter of the casing pipe is 250ram (inner diameter), the mouth of the pressure reducing well is about 0.50m higher than the ground to prevent surface sewage from permeating into the well, and the pressure reducing well is generally sealed by high-quality clay or cement paste. Generally, a strainer and a settling tube are provided, the diameter of the strainer is the same as that of a well wall pipe, the settling tube is welded to the bottom of the strainer, the diameter of the settling tube is the same as that of the strainer, and the bottom opening of the settling tube is sealed by an iron plate. To prevent ground subsidence caused by diving. And (3) filling the gravel material above the filling surface 4 to the ground 5 by adopting high-quality clay, tamping and sealing the wellhead pipe.
In this embodiment, preferred water-swelling circle 3 is the ring shape of level placement, and water proof membrane 6 is a ring section of thick bamboo to wrap up outside being annular water-swelling material 7, be equipped with rupture of membranes mechanism between water-swelling material 7 top and the 6 tops of water proof membrane, be used for placing the back that targets in place at water-swelling circle 3 and break open 6 top circles of water proof membrane. It is further preferred that the inner diameter of the water-swellable ring 3 is matched with the outer diameter of the well casing 1, and the outer diameter of the water-swellable ring 3 is matched with the inner diameter of the drilled hole. It is further preferred that the water-swellable material 7 is composed of a plurality of water-swellable rubber rings stacked in a circular ring shape. It is further preferable that the water-swellable rubber ring is made of a polymer inorganic water-swellable material and rubber. The general specifications of the water-swellable rubber ring are 40mm and 45mm in outer diameter, 1cm in thickness and 8mm, 10mm, 12mm, 14mm, 16mm and 20mm in inner diameter, and the specification with the smaller inner diameter can be selected in the embodiment. The water-swelling rubber ring (water-swelling water-stopping ring) can absorb water and swell when meeting water, the swelling rate is more than or equal to 200 percent, the gap between the well pipe and the well wall is compacted by self-swelling, the water-stopping effect can be completely realized, the operation is very flexible and convenient in actual construction, and the labor, the time and the raw materials are saved. In order to prevent the expansion when the expansion is not required, the waterproof material (waterproof film) such as a plastic film is used for wrapping. The membrane breaking mechanism preferably comprises a membrane breaking lead 10, the membrane breaking lead is provided with a membrane breaking section arranged between the top of the water-swelling material 7 and the waterproof membrane 6 for one circle and a lead section used for leading the membrane breaking lead 10 out of the ground surface, and a plurality of strip-shaped blades 8 are inserted in the membrane breaking section; after the water-swellable ring 3 is placed in place, the blade 8 inserted on the membrane breaking section is driven to break open the waterproof membrane 6 at the top of the water-swellable ring 3 by pulling the lead section. In order to protect the blade 8 of the water-swelling ring 3 from scratching the waterproof film in the process of running in, the lead sections and the blades 8 which are inserted on the lead sections are wrapped with lead protective sleeves 9. Preferably, the water-swellable ring 3 is further provided with bagged clay balls, and the bagged clay balls are used as counter weights to drive the water-swellable ring 3 to be put between the well pipe 1 and the drilled hole.
A layered water stopping method for preventing and treating sudden gushing of the confined water side wall of a foundation pit depressurization well adopts the device, and the method comprises the following steps:
s1: drilling in a foundation pit project, determining the hole position of a depressurization well, hoisting into a well pipe 1, and sealing the bottom and the well hole by using clay balls 2;
s2: after the sedimentation is stable, sleeving the water-swellable ring 3 on the well pipe 1 and putting the water-swellable ring in place, breaking the waterproof membrane 6 after the water-swellable ring 3 is placed in place, and continuously filling clay balls 2 after the sedimentation is stable;
s3: and repeating the step S2 until the side wall of the well pipe 1 is sealed on the ground surface.
More specifically: firstly, drilling a hole in the foundation pit engineering, determining the hole position of a depressurization well, hanging a well pipe into the hole, sealing the bottom and the well hole by using high-quality clay balls, after settling is stable, then the produced water-swellable ring 3 (the specification is matched with the well pipe) is sleeved and taken to the underground part by a bagged clay ball, the blade 8 can be pulled by a prefabricated lead pull ring arranged at the tail end of the membrane-breaking lead 10 to break the waterproof membrane 6 outside the water-swelling ring 3, the lead 10 is retracted to ensure that the water-swelling material is exposed, after the sedimentation is stable, calculating the number of the used water-swellable rings according to the relation between the sedimentation rule and the specifications of the swellable rings and the length of the well pipe, repeating the steps for many times until the side wall is plugged on the ground 5, filling the ground surface with high-quality clay above the ground 5 and tamping the filled ground surface, and sealing the outside of the wellhead pipe, and sealing and filling the clay ball and the water-swellable material to prevent and control the leakage of the side wall of the whole depressurization well. When confined water seepage appears in soil layer, lower part clay ball on every side, meet water expansion ring and meet water and expand the gap between well casing and the drilling several times promptly and fill, block water seepage flow path, realize initiative stagnant water, clay ball 2 is mutual with 3 multilayer of meeting water expansion ring, for multilayer stagnant water protective screen, protect layer upon layer, realize complete stagnant water basically, effectively block the confined water of scurrying, guarantee step-down well completion back, the wall of a well suddenly gushes can not appear at the foundation ditch excavation in-process. During the use process, attention should be paid to ensure that the clay balls are settled stably and friction between the water swelling ring and the well pipe is met, attention should be paid to the dynamic state of the lowering process of the lead, and the waterproof membrane is prevented from being scratched.
According to the invention, the side wall of the pressure reduction well can be effectively blocked by using the water-swellable material before the foundation pit falls, the sudden surge of the side wall of the confined water is prevented and prevented when the pressure reduction well works, and the problem that the normal work of the pressure reduction well is influenced by water seepage and sudden surge caused by poor clay ball blocking quality is greatly reduced.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. The layered water stopping device is characterized by comprising clay balls (2) and water swelling rings (3) which are filled between a well casing (1) of a pressure reducing well and a drill hole and are arranged in the height direction at intervals one by one, wherein the water swelling rings (3) are sleeved outside the well casing (1) and are provided with water swelling materials (7) and waterproof membranes (6) wrapping the water swelling materials (7), and the waterproof membranes (6) break after the water swelling rings (3) are placed in place, so that the water swelling materials (7) are exposed;
when confined water leaks, the water-swellable material (7) in the water-swellable ring (3) swells in the presence of water to form a vertical water-isolating body;
the water-swelling ring (3) is horizontally arranged in a ring shape, the waterproof membrane (6) is in a ring barrel shape and is wrapped outside the water-swelling material (7) in the ring shape, and a membrane breaking mechanism is arranged between the top of the water-swelling material (7) and the top of the waterproof membrane (6) and is used for breaking one circle of the top of the waterproof membrane (6) after the water-swelling ring (3) is placed in place;
the inner diameter of the water-swellable ring (3) is matched with the outer diameter of the well pipe (1), and the outer diameter of the water-swellable ring (3) is matched with the inner diameter of a drilled hole;
the film breaking mechanism comprises a film breaking lead (10), the film breaking lead is provided with a film breaking section and a lead section, the film breaking section is arranged between the top of the water-swelling material (7) and the waterproof film (6) for one circle, the lead section is used for leading the film breaking lead (10) out of the ground surface, and a plurality of strip-shaped blades (8) are inserted in the film breaking section; after the water-swellable ring (3) is placed in place, the blade (8) inserted on the membrane breaking section is driven to break open the waterproof membrane (6) on the top of the water-swellable ring (3) by pulling the lead section.
2. The layered water stopping device for preventing and treating confined water side wall inrush of foundation pit depressurization well according to claim 1, wherein the water-swellable material (7) is composed of a plurality of water-swellable rubber rings which are stacked in a circular shape.
3. The layered water stopping device for preventing and treating confined water side wall inrush of foundation pit depressurization well according to claim 2, wherein the water-swellable rubber ring is made of high molecular inorganic water-absorbing swelling material and rubber.
4. The layered water stopping device for preventing and treating confined water side wall inrush of a foundation pit depressurization well according to claim 1, wherein a lead protecting sleeve (9) is wrapped outside the blade (8) inserted on the lead section and the membrane breaking section.
5. The layered water stopping device for preventing and treating confined water side wall inrush of a foundation pit depressurization well according to claim 1, wherein a bagged clay ball is further arranged below the water-swellable ring (3), and the bagged clay ball is used as a counterweight to drive the water-swellable ring (3) to descend between the well casing (1) and a drilled hole.
6. A layered water stopping method for preventing and treating confined water side wall inrush of a foundation pit depressurization well is characterized in that the device of any one of claims 1 to 5 is adopted, and the method comprises the following steps:
s1: drilling in a foundation pit project, determining a hole position of a depressurization well, hanging a well pipe (1), and sealing a well bottom and a well hole by using a clay ball (2);
s2: after the sedimentation is stable, the water-swellable ring (3) is sleeved on the well pipe (1) and is put in, the waterproof membrane (6) is broken after the water-swellable ring (3) is placed in place, and the clay ball (2) is continuously filled after the sedimentation is stable;
s3: and repeating the step S2 until the side wall of the well pipe (1) is plugged on the ground surface.
7. The layered water stopping method for preventing and treating confined water side wall inrush of a foundation pit depressurization well according to claim 6, wherein the number of the used water-swellable rings (3) is calculated according to the relationship among the settlement rule of clay balls (2), the specification of the water-swellable rings (3) and the length of a well pipe (1).
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| CN117231159B (en) * | 2023-11-10 | 2024-02-20 | 克拉玛依市禹荣有限责任公司 | Bentonite shutoff construction equipment of self-flowing well |
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| WO2007012340A1 (en) * | 2005-07-26 | 2007-02-01 | Edi Exploration Drilling International Gmbh | Sealing material used for building wells and filling underground hollow spaces, especially deep boreholes |
| CN204875933U (en) * | 2015-08-21 | 2015-12-16 | 山东省水利科学研究院 | Deep pressure -bearing artesian well shutoff system |
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