CN113622442B - Plugging method for dewatering well - Google Patents
Plugging method for dewatering well Download PDFInfo
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- CN113622442B CN113622442B CN202110897389.4A CN202110897389A CN113622442B CN 113622442 B CN113622442 B CN 113622442B CN 202110897389 A CN202110897389 A CN 202110897389A CN 113622442 B CN113622442 B CN 113622442B
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- well
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- plugging
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- dewatering
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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
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of engineering construction, solves the problem that a dewatering well is not easy to block in the prior art, and particularly discloses a dewatering well blocking method.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a plugging method for a dewatering well.
Background
The dewatering well is a well for dewatering, and underground water is pumped by a water pump so as to reduce the water level of the underground water; in the construction of underground structures, the method belongs to a common precipitation facility, such as: seepage or gushing water often can appear in the construction of deep basal pit (or basement), in order to guarantee the construction of dry land, then generally adopt precipitation well to reduce ground water level in the construction scope to can guarantee the normal construction outside the precipitation well scope. After the construction is finished, the dewatering well needs to be plugged.
During construction, the fact that water-carrying operation cannot be carried out when the plugging concrete is poured is discovered, the final plugging concrete pouring can be carried out under the condition of completely controlling accumulated water, the vibration quality is enhanced during pouring, internal holes are avoided, however, under the action of an underground water head and the phenomenon of quicksand, the phenomenon of quicksand refers to the phenomenon that when the foundation pit is excavated to the position below the underground water level, the soil is fine sand or silt sand, and when a water collecting pit is adopted for precipitation, under the action of certain dynamic water pressure, the soil under the pit can form a flowing state and flows together with underground water to flow into the pit, and the generated phenomenon is called quicksand phenomenon; and then cause the infiltration of filling out after filling out soil easily, follow-up pouring shutoff concrete is very difficult, and when meetting rainy season or when being close to the water source, groundwater water permeability is stronger for the quicksand phenomenon is more serious, and the subsoil is more loose, further causes the shutoff more difficult.
Disclosure of Invention
The invention is made in view of the problems, and aims to provide a dewatering well plugging method which can effectively reduce water seepage of filled soil, enhance the density of surrounding bottom soil and ensure subsequent pouring plugging.
In order to achieve the purpose, the invention provides a plugging method of a dewatering well, wherein a foundation slab is arranged above the dewatering well, and a pipe well communicated with the dewatering well is arranged on the foundation slab, and the plugging method comprises the following steps:
s1: extracting water in the precipitation well to enable the water level to reach a first preset value;
s2: selecting a water absorption material, putting the water absorption material into the dewatering well to form a water absorption layer, and putting a coagulant into the dewatering well when the water absorption rate of the water absorption layer reaches a second preset value, so that the water body in the dewatering well is converted into colloid;
s3: filling a mixture into the precipitation well, tamping the mixture, and pre-plugging the pipe well of the foundation slab;
s4: when the water absorption rate of the water absorption layer reaches a third preset value, removing the pre-plugging in the foundation slab tubular well, filling the pre-plugging material in the foundation slab tubular well into the dewatering well, tamping the pre-plugging material above the mixture, and enabling a cushion space to be arranged between the upper surface of the pre-plugging material and the lower surface of the foundation slab;
s5: and filling a hard cushion layer in the cushion layer space, and plugging the tube well of the foundation slab again.
According to the method for plugging the precipitation well, in the step S1, water in the precipitation well is pumped by a water pump.
According to the plugging method for the dewatering well, in the step S2, the range of the second preset value is 30% -40%.
According to the plugging method for the dewatering well, in the step S2, the water absorbing material is water absorbing resin.
According to the plugging method for the dewatering well, in the step S3, the water-absorbent resin is arranged in the mixture.
According to the plugging method for the dewatering well, in the step S4, the third preset value is 85%.
According to the dewatering well plugging method, in the step S4, the diameter of the cushion space is larger than that of the dewatering well.
According to the plugging method for the dewatering well, the plugging in the step S5 comprises the following steps:
s51: performing scabbling treatment on the side edge of the pipe well of the foundation slab;
s52: placing a reinforcement cage into the pipe well, and welding the reinforcement cage with the reinforcement in the pipe well;
s53: and pouring concrete into the pipe well.
According to the dewatering well plugging method, before the step S53, the water stopping adhesive tape is installed on the side wall of the pipe well.
According to the dewatering well plugging method, in step S53, the concrete is micro-expansive impervious concrete, the tamping vibration of the concrete is enhanced during pouring, secondary rolling and polishing are carried out before the initial setting of the concrete, and the wet maintenance is carried out.
The invention has the following beneficial effects: the water absorption layer is formed by the water absorption resin body, so that water in the precipitation well can be rapidly absorbed, when the water absorption rate of the resin body reaches 30% -40%, a coagulant is put into the precipitation well, the residual water and various impurities can be used for forming colloid, the colloid can form effective sedimentation, silt and gravel can be fixed, the phenomenon of surging along with water flow is prevented, the kinetic water pressure and the phenomenon of sand flowing are overcome, the colloid is adsorbed on the inner wall of the precipitation well, water permeation can be reduced, the effective construction is ensured, the silt and gravel which can be adsorbed by the colloid can form a scattering structure similar to branches, part of the water absorption resin is contained in the colloid, the displacement is reduced or prevented, the phenomenon of sand flowing is further inhibited, water seepage from the bottom of the precipitation well is reduced, when the water absorption resin is contained in the colloid, the colloid can continuously absorb water, the colloid is dehydrated, the viscosity of the colloid is higher, the fluidity is poorer, the structure formed by the water absorption layer is more stable, namely, the impurities are adsorbed by the colloid, and the structures formed by the water absorption resin and are mutually crosslinked to form a more stable structure and expand water blocking; further, the mixture is filled in the dewatering well and tamped, and the foundation slab is pre-plugged, so that the expanded water-absorbent resin body can expand to the periphery, original soil around the dewatering well is squeezed and tamped, the density is increased, the water permeability is reduced, and the mixture is prevented from excessively absorbing water; the water-absorbing resin in the mixture can reduce or avoid the failure of the mixture; the pre-plugging is removed, and the removed pre-plugging material is used for landfill into the precipitation well again and tamping is carried out to ensure that a cushion space is formed between the upper surface of the pre-plugging material and the lower surface of the foundation bottom plate, practically all structures in the well are tamped for the second time and are extruded for the second time, so that the space between the water-absorbing resin bodies is reduced, the cross-linking of the water-absorbing layer of the colloid is tighter, the dispersion of the water-absorbing resin caused by the impact of underground water is reduced, and the stability of the foundation is ensured; through the steps, the seeped water can be absorbed by the water-absorbent resin body before the hard cushion layer is filled, so that the hard cushion layer can be filled in a dry environment, and 15% of expansion space can be reserved for the periphery due to 85% of water absorption, so that overlarge jacking force on the foundation slab is avoided.
Drawings
FIG. 1 is a general flow diagram of the method of the present invention;
FIG. 2 is a schematic structural diagram of the plugging of the dewatering well of the present invention;
in the figure: 1. a foundation slab; 2. a water-absorbing layer; 3. mixing the materials; 4. pre-plugging material; 5. a hard cushion layer; 6. concrete; 7. a water stopping adhesive tape; 9. a water line.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-2, a plugging method for dewatering wells comprises the following steps:
s1: extracting water in the precipitation well to enable the water level to reach a first preset value; wherein the water pumping adopts a water pump, and a water level line 9 is arranged in the precipitation well and is used for monitoring the water level.
S2: selecting a water absorbing material, putting the water absorbing material into a dewatering well to form a water absorbing layer 2, and when the water absorption rate of the water absorbing layer 2 reaches a second preset value, selecting a coagulant to put into the dewatering well to convert the water body in the dewatering well into colloid; in this embodiment, the water-absorbing material is selected as water-absorbing resin, and certainly, other suitable water-absorbing materials can be selected, and the range of the present application should not be exceeded, in this embodiment, the plurality of water-absorbing resins form the water-absorbing layer 2, the water-absorbing resin in the water-absorbing layer 2 is strip-shaped, after the colloid is formed, the colloid can form an effective settling action, and can fix silt, gravel and the like in water, prevent the silt, gravel and the like from surging along with water flow, and overcome dynamic water pressure and sand running phenomenon, and the colloid can be adsorbed on the inner wall of the dewatering well, when the colloid is adsorbed on the inner wall of the dewatering well, some sand and water-absorbing resin can be adsorbed in the middle of the colloid, so that the sand running phenomenon can be further reduced, the water absorption of the water-absorbing resin can cause dehydration of the colloid, the viscosity of the colloid can be larger, the fluidity is poorer, the structure formed with the water-absorbing layer 2 is more stable, and the expansion water plugging can be performed; wherein the coagulant is selected from aluminum coagulant, animal glue coagulant or gum coagulant; wherein the second preset value ranges from 30% to 40%, namely, when the water absorption rate of the water absorption layer 2 reaches 30% to 40%, the coagulant can be added.
S3: filling the mixture 3 into the precipitation well, tamping the mixture 3, and pre-plugging the pipe well of the foundation slab 1; after the mixture 3 is tamped, the expanded water-absorbent resin can be expanded to the periphery, the soil around the dewatering well is tamped, the density can be increased, the water permeability can be reduced, the mixture 3 is ensured not to absorb water excessively, the water-absorbent resin is arranged in the mixture 3, and the water-absorbent resin is utilized to prevent the mixture 3 from losing efficacy.
S4: when the water absorption rate of the water absorption layer 2 reaches a third preset value, removing the pre-plugging in the pipe well of the foundation slab 1, filling the pre-plugging material 4 in the pipe well of the foundation slab 1 into the dewatering well, tamping the pre-plugging material 4 above the mixture 3, and enabling a cushion space to be arranged between the upper surface of the pre-plugging material 4 and the lower surface of the foundation slab 1; the third preset value is 80%, when the water absorption rate is reached, the pre-plugging material 4 in the tube well of the foundation slab 1 is removed, and the water-absorbing well is filled with the pre-plugging material 4, tamped for the second time and extruded for the second time, so that the space between the water-absorbing resins can be further reduced, the connection between the colloid and the water-absorbing layer 2 is tighter, the dispersion of the water-absorbing resins caused by the impact of underground water can be prevented, and the stability of the structure is ensured.
S5: filling a hard cushion layer 5 in the cushion layer space, and plugging the pipe well of the foundation slab 1 again; wherein the diameter of the cushion layer space should be larger than that of the dewatering well so as to ensure better partition effect.
The plugging in step S5 includes:
s51: roughening the side edge of the pipe well of the foundation slab 1;
s52: placing a reinforcement cage into the pipe well, and welding the reinforcement cage with the reinforcement in the pipe well;
s53: concrete 6 is poured into the tube well.
Before step S53, the waterproof tape 7 is attached to the side wall of the pipe well.
In step S53, the concrete 6 is a micro-expansive impervious concrete 6, the tamping vibration of the concrete 6 is enhanced during the casting, the secondary rolling and burnishing are performed before the initial setting of the concrete 6, and the wet curing is performed for at least seven days.
The invention provides a method for plugging a dewatering well, which comprises the steps of putting a plurality of water-absorbing resins into the dewatering well to form a water absorbing layer, converting water in the dewatering well into colloid through a coagulant, settling sand grains and broken stones in the water by utilizing the characteristics of the colloid, reducing the phenomenon of quicksand, absorbing some sand grains, broken stones and water-absorbing resins on the inner wall when the colloid is absorbed on the inner wall of the dewatering well, further inhibiting the phenomenon of quicksand, reducing the water seepage, sequentially adding a mixture and a pre-plugging material into the dewatering well, sequentially tamping, expanding the water-absorbing resins to the periphery, squeezing and tamping soil on the side edge of the dewatering well, improving the density, reducing the water permeability, preventing the mixture from losing efficacy, and providing a dry environment for final plugging.
The technical solutions of the present invention are explained in detail above with reference to the accompanying drawings, and the described embodiments are used to help understanding the idea of the present invention. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions of the present invention as related to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated is indicative. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Claims (9)
1. A foundation slab is arranged above a dewatering well, and a pipe well communicated with the dewatering well is arranged on the foundation slab, and the method is characterized by comprising the following steps:
s1: extracting water in the precipitation well to enable the water level to reach a first preset value;
s2: selecting a water absorption material, putting the water absorption material into the dewatering well to form a water absorption layer, and putting a coagulant into the dewatering well when the water absorption rate of the water absorption layer reaches a second preset value to convert the water body in the dewatering well into colloid;
s3: filling a mixture into the precipitation well, tamping the mixture, and pre-plugging the pipe well of the foundation slab, wherein water-absorbing resin is arranged in the mixture;
s4: when the water absorption rate of the water absorption layer reaches a third preset value, removing the pre-plugging in the foundation slab tubular well, filling the pre-plugging material in the foundation slab tubular well into the dewatering well, tamping the pre-plugging material above the mixture, and enabling a cushion space to be arranged between the upper surface of the pre-plugging material and the lower surface of the foundation slab;
s5: and filling a hard cushion layer in the cushion layer space, and plugging the tube well of the foundation slab again.
2. The plugging method of a dewatering well according to claim 1, characterized in that in step S1, a water pump is used for pumping water in the dewatering well.
3. The plugging method of dewatering well as claimed in claim 1, wherein the second predetermined value in step S2 is in a range of 30% -40%.
4. The plugging method of dewatering well as claimed in claim 1, wherein in step S2, the water absorbing material is water absorbing resin.
5. The plugging method of dewatering well as claimed in claim 1, wherein the third predetermined value in step S4 is 85%.
6. The plugging method for dewatering well as claimed in claim 1 or 5, wherein in step S4, the diameter of the bedding space is larger than that of the dewatering well.
7. The plugging method of dewatering well as claimed in claim 1, wherein the plugging in step S5 includes:
s51: performing chiseling treatment on the side edge of the pipe well of the foundation slab;
s52: placing a reinforcement cage into the pipe well, and welding the reinforcement cage with the reinforcement in the pipe well;
s53: and pouring concrete into the pipe well.
8. The plugging method of dewatering well as claimed in claim 7, wherein before step S53, a water stop strip is installed on the side wall of the tube well.
9. The plugging method of dewatering well according to claim 7, characterized in that in step S53, the concrete is micro-expansive impervious concrete, the concrete is vibrated by tamping during casting, and the concrete is rolled for polishing for the second time before initial setting and is subjected to wet curing.
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| CN202110897389.4A CN113622442B (en) | 2021-08-05 | 2021-08-05 | Plugging method for dewatering well |
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| CN202110897389.4A CN113622442B (en) | 2021-08-05 | 2021-08-05 | Plugging method for dewatering well |
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| CN113622442A CN113622442A (en) | 2021-11-09 |
| CN113622442B true CN113622442B (en) | 2023-01-24 |
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| CN115419096B (en) * | 2022-09-30 | 2023-12-01 | 中建八局第二建设有限公司 | Dewatering well bottom plate and dewatering well plugging method |
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| JPS59122629A (en) * | 1982-12-28 | 1984-07-16 | Nasu Denki Tekko Kk | Construction of prefabricated underground structure |
| CN206220135U (en) * | 2016-11-24 | 2017-06-06 | 中建八局第四建设有限公司 | A kind of underground waterproof building structure |
| CN110700296B (en) * | 2019-09-27 | 2020-10-02 | 中国十七冶集团有限公司 | Foundation pit dewatering system with high water level and weak permeability soil and implementation method |
| CN112832279B (en) * | 2021-01-05 | 2022-10-21 | 江苏凯伦建材股份有限公司 | Waterproof structure and method for dewatering well of underground foundation pit |
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