CN112832279A - Waterproof structure and method for dewatering well of underground foundation pit - Google Patents
Waterproof structure and method for dewatering well of underground foundation pit Download PDFInfo
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- CN112832279A CN112832279A CN202110005915.1A CN202110005915A CN112832279A CN 112832279 A CN112832279 A CN 112832279A CN 202110005915 A CN202110005915 A CN 202110005915A CN 112832279 A CN112832279 A CN 112832279A
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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
- E02D19/22—Lining sumps in trenches or other 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
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention discloses a waterproof structure of a dewatering well of an underground foundation pit, which comprises a well pipe extending along the up-down direction, and the waterproof structure also comprises: a bentonite layer formed of bentonite filled in a lower portion of the well pipe; a steel fiber concrete layer formed of steel fiber concrete filled in the well pipe, the steel fiber concrete layer being located above the bentonite layer; and the putty type water swelling and stopping piece surrounds the outer wall of the well pipe. The bentonite swells in water to form a water-insoluble gelatinous crystal to block underground catchment, and meanwhile, the steel fiber concrete filled later is prevented from being poured in a water environment, so that the water-cement ratio of the steel fiber concrete is prevented from being influenced; the steel fiber concrete further plugs the dewatering well, so that the problems of cracking and shrinkage are avoided, and leakage is avoided; the wall of the precipitation well is sealed by the putty type water swelling water stop piece, so that leakage is avoided, and the cost is low. Therefore, the waterproof structure has a good waterproof effect, reduces the hidden danger of leakage, and is simple in construction process and low in cost.
Description
Technical Field
The invention belongs to the technical field of building construction, and relates to a waterproof structure and a waterproof method for a dewatering well of an underground foundation pit.
Background
Along with the increasing demand of people to the underground space, deep big foundation ditch engineering is more and more general, and deep, big foundation ditch engineering dewatering generally adopts underground foundation ditch precipitation well at present, and this structure has advantages such as construction is simple, be suitable for extensively, the dewatering degree of depth is big.
However, the dewatering well of the underground pipe well has the following problems: the underground pipe well precipitation well needs to be sealed after precipitation is finished, but water seepage in the well or water seepage in the well wall easily occurs at the later stage, and the reason for the water seepage in the well wall is mainly that dry-mixed concrete is adopted for plugging in the conventional common construction mode, water in the underground foundation pit precipitation well is difficult to drain, the precipitation well is small and deep in space, the concrete is difficult to vibrate and compact, the effect of plugging by the dry-mixed concrete is general, and the precipitation well has a water catchment function, so that the leakage rate of the basement precipitation well is higher.
Disclosure of Invention
Aiming at least one of the technical problems, the invention provides a waterproof structure of a dewatering well of an underground foundation pit, which has a good leakage prevention effect; the invention also provides a waterproof method of the dewatering well of the underground foundation pit, which has a good leakage prevention effect.
The invention provides a waterproof structure of a dewatering well of an underground foundation pit. The structure comprises a well pipe extending in the up-down direction, and the waterproof structure further comprises a bentonite layer formed of bentonite filled in the lower portion of the well pipe. The steel fiber concrete layer is formed by steel fiber concrete filled in the well pipe, and the precipitation well is further plugged by adopting micro-expansion steel fiber concrete, so that the problems of cracking and shrinkage of common concrete are avoided. The steel fiber concrete layer is positioned above the bentonite layer. And the putty type water swelling and stopping piece surrounds the outer wall of the well pipe.
In one embodiment, the bentonite is sodium bentonite. The sodium bentonite has the function of swelling when meeting water, can form water-insoluble gelatinous crystals to block underground catchment, and simultaneously avoids the influence on the water cement ratio of the micro-expansive concrete in subsequent construction due to the fact that the micro-expansive concrete is poured in water environment.
Further, the height of the bentonite layer is not less than 1 meter.
In one embodiment, the putty-type water-swelling water stop is formed by wrapping a putty-type water-swelling water stop strip on the outer wall of the well pipe. This structure plays and strengthens sealed, prevents the effect of wall of a well seepage. In one embodiment, the upper portion of the well tube has a concrete layer thereon, and the putty-type water-swellable water stop is positioned between the well tube and the concrete layer.
In an embodiment, concrete layer below is equipped with the concrete cushion, concrete cushion upper berth is equipped with waterproofing membrane, concrete layer form in on the waterproofing membrane, waterproofing membrane can prevent scurrying water.
Further, the putty type water swelling water stop piece and sealing glue is arranged between the waterproof coiled materials.
In one embodiment, the lower end of the steel fiber concrete layer is lower than the concrete cushion layer.
In an embodiment, the water-tight structure further comprises a water-tight cover plate for closing the upper end of the well tubular. Further, the waterproof cover plate is a metal cover plate.
In one embodiment the upper end of the well casing has a ring of outwardly extending flanges forming a collar for the well casing, the water-tight cover plate being fastened to the collar. And a flange plate and a cover plate are arranged at the wellhead of the dewatering well to further plug the dewatering well, so that the potential leakage hazard is avoided.
The invention provides a waterproof method for a dewatering well of an underground foundation pit, which comprises the following steps:
A. forming a concrete pad around a well pipe of the dewatering well;
B. paving a waterproof coiled material on the concrete cushion layer;
C. sealing a gap between the waterproof coiled material and the outer wall of the well pipe by using a sealant;
D. the putty type water-swelling water stop piece is arranged on the outer wall of the well pipe in a surrounding manner;
E. pouring bottom plate concrete to form a bottom plate concrete layer;
F. filling bentonite into the lower part of the well pipe to form a bentonite layer;
G. filling steel fiber concrete into the well pipe, and forming a steel fiber concrete layer on the bentonite layer;
H. fastening a waterproof cover plate on the upper end of the well pipe;
I. and pouring concrete to seal the well pipe and the waterproof cover plate to form a bottom plate post-pouring belt.
In one embodiment, in the step D, a putty-type water-swelling water stop strip is wound around the outer wall of the well pipe for one turn. Strengthen sealed, prevent the wall of a well seepage.
In one embodiment, in step F, the height of the bentonite layer is not less than 1 meter to ensure the blocking of groundwater.
In one embodiment, in steps F and G, the building material is compacted by using an inserted vibrating rod.
In an embodiment, in the step F, the lower end of the steel fiber concrete layer is lower than the concrete cushion layer.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
according to the waterproof structure and the waterproof method of the dewatering well of the underground foundation pit, the well pipe is filled with the bentonite layer, the steel fiber concrete layer is filled on the well pipe, the bentonite expands when meeting water to form a water-insoluble gelatinous crystal, underground catchment is blocked, and meanwhile, the filled steel fiber concrete is prevented from being filled in a water environment, so that the water-cement ratio of the well pipe is prevented from being influenced; the steel fiber concrete further plugs the dewatering well, so that the problems of cracking and shrinkage are avoided, and leakage is avoided; the wall of the precipitation well is sealed by the putty type water swelling water stop piece, so that leakage is avoided, and the cost is low. Therefore, the waterproof structure has a good waterproof effect, reduces the hidden danger of leakage, and is simple in construction process and low in cost.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic view of a waterproof structure of a dewatering well of an underground foundation pit according to an embodiment of the invention.
Wherein:
1. a flange plate; 2. a bolt and nut fastener; 3. a waterproof cover plate; 4. post-pouring a concrete layer; 5. a concrete layer; 6. a putty type water-swelling water stop piece; 7. sealing glue; 8. a steel fiber concrete layer; 9. waterproof coiled materials; 10. a bentonite layer; 11. a well pipe; 12. a concrete cushion; 13. and (5) an undisturbed soil layer.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
The terms of orientation such as "upper" and "lower" are defined based on the attached figure 1 and the orientation of the dewatering well during actual waterproof construction.
The embodiment provides a waterproof construction of underground structure foundation ditch precipitation well, specifically is a waterproof construction of basement precipitation well. Referring to fig. 1, it includes a well pipe 11 extending in the up-down direction. This waterproof construction still includes: a bentonite layer 10 formed of bentonite filled in a lower portion of the well pipe 11; a steel fiber concrete layer 8 formed of steel fiber concrete filled in the well pipe 11, the steel fiber concrete layer 8 being located above the bentonite layer 10; and a putty type water-swelling water stop 6 arranged around the outer wall of the well pipe 11.
In the present embodiment, the bentonite layer 10 is specifically formed of sodium bentonite. The sodium bentonite has the function of swelling when meeting water, can form water-insoluble gelatinous crystals to block underground catchment, and simultaneously avoids the influence on the water cement ratio (the water cement ratio refers to the weight ratio of the water consumption in concrete to the cement consumption) caused by the pouring of the micro-expansive steel fiber concrete in water environment in subsequent construction. The precipitation well is further plugged by adopting the micro-expansion steel fiber concrete, so that the problems of cracking and shrinkage of common concrete are avoided. Because precipitation well casing 11 space is limited, can't erect the steel reinforcement cage, adopt ordinary concrete direct casting to appear problem such as fracture, shrink easily to lead to the seepage.
In this embodiment, the putty-type water-swelling seal 6 is formed by wrapping a putty-type water-swelling seal strip on the outer wall of the well pipe 11 in a full length manner. In this embodiment, the upper part of the well pipe 11 is provided with a concrete layer 5, and the putty-type water-swelling water stop member 6 is located between the well pipe 11 and the concrete layer 5.
In this embodiment, concrete layer 5 below is equipped with concrete cushion 12, and concrete cushion 12 lower floor is original state soil layer 13, and concrete cushion 12 upper berth is equipped with waterproofing membrane 9, and concrete layer 5 is formed on waterproofing membrane 9, is provided with sealed glue 7 between putty type water swelling stagnant water piece 6 and the waterproofing membrane 9. The periphery of the dewatering well wall is reinforced and sealed by adopting a PUS polyurethane building sealant 7 and a putty type water swelling water stop strip, so that the leakage of the well wall is prevented. The structure of the soleplate large-surface MBP-Pro macromolecular self-adhesive film pre-paved waterproof coiled material 9 is fully adhered to avoid water channeling.
In this embodiment, the lower end of the steel fibre concrete layer 8 is below the concrete pad 12.
In this embodiment the water-tight construction further comprises a water-tight cover plate 3 for closing the upper end of the well pipe 11. The upper end of the well pipe 11 has a ring of outwardly extending flanges which form the collar of the well pipe, and the water-tight cover plate 3 and the collar are fastened together by means of bolt and nut fasteners 2. The flange plate 1 and the cover plate are arranged at the wellhead of the dewatering well to further plug the dewatering well, so that the potential leakage hazard is avoided.
The embodiment also provides a waterproof method of the dewatering well of the underground foundation pit, which comprises the following steps:
A. a concrete pad 12 forming a well pipe 11 surrounding the dewatering well;
B. paving waterproof coiled materials 9 on the concrete cushion layer 12;
C. sealing a gap between the waterproof coiled material 9 and the outer wall of the well pipe 11 by using a sealant 7;
D. the putty type water-swelling water stop piece 6 is arranged on the outer wall of the well pipe 11 in a surrounding way;
E. pouring bottom plate concrete to form a bottom plate concrete layer 5;
F. filling bentonite into the lower part of the well pipe 11 to form a bentonite layer 10;
G. filling steel fiber concrete into the well pipe 11 to form a steel fiber concrete layer 8 on the bentonite layer 10;
H. fastening the waterproof cover plate 3 on the upper end of the well pipe 11;
I. and (3) sealing the well pipe 11 and the waterproof cover plate 3 by pouring concrete to form a bottom plate post-pouring belt.
In step a: a concrete pad 12 is formed around the well pipe 11 of the dewatering well.
In step B: and after the cushion construction and maintenance meet the requirements, constructing an MBP-Pro high-molecular self-adhesive film on the large surface and pre-paving a waterproof coiled material 9, and cutting the waterproof coiled material 9 at the dewatering well part along the contour of the dewatering well.
In step C: and the periphery of the dewatering well is sealed by PUS polyurethane building sealant 7.
In step D: aiming at the part of the dewatering well embedded into the bottom plate concrete, the outer wall of the dewatering well is reinforced and sealed by winding a whole circle of putty type water swelling water stop bars in length.
In step E: the reinforcement and the bottom plate concrete pouring are directly carried out on the bottom plate waterproof layer, the concrete pouring is fully and compactly carried out by vibration, particularly, the vibration is enhanced around the dewatering well wall, and a space closed in the later period of the dewatering well is reserved during the pouring.
In step F: after the dewatering of the dewatering well is finished, a sodium bentonite bag is put into the dewatering well, and a tool is adopted for extrusion, so that the packing is guaranteed to be compact. The sodium bentonite pack packing height is not less than 1m to ensure the blocking of underground water.
In step G: the lower end of the steel fibre concrete layer 8 is below the concrete pad 12. And an inserted vibrating rod is adopted for vibrating, so that the building material is tightly filled. Filling the interior of the dewatering well to the top by adopting micro-expansion steel fiber concrete with the grade not lower than C30, wherein the filling is carried out in a layered manner.
In step H: the wellhead of the dewatering well is provided with the flange plate 1, and the waterproof cover plate 3 is fixed in a bolt-nut fastener 2 connection and full welding mode, so that the dewatering well is ensured to be sealed reliably.
In step I: and (3) chiseling and cleaning the poured floor concrete construction joint, then coating CCCW cement-based capillary crystalline waterproof coating for joint treatment, and finally performing closed pouring by adopting the compensation shrinkage concrete which is improved by one strength mark compared with the floor structure to form a concrete layer post-cast strip 4.
The steps of the waterproof method of the embodiment are briefly described as follows: the construction method comprises the following steps of bottom plate waterproof layer construction, dewatering well periphery sealing, putty type water swelling water stop 6 construction, bottom plate concrete partial pouring, dewatering well internal bentonite layer 10 filling, dewatering well internal steel fiber concrete layer 8 filling, dewatering well wellhead waterproof cover plate 3 installation, and bottom plate concrete pouring sealing to form a concrete layer post-pouring belt 4.
The waterproof structure and the method for the dewatering well of the underground foundation pit have the following advantages:
according to the waterproof structure and the waterproof method of the dewatering well of the underground foundation pit, the well pipe is filled with the bentonite layer, the steel fiber concrete layer is filled on the well pipe, the bentonite expands when meeting water to form a water-insoluble gelatinous crystal, underground catchment is blocked, and meanwhile, the filled steel fiber concrete is prevented from being filled in a water environment, so that the water-cement ratio of the well pipe is prevented from being influenced; the steel fiber concrete further plugs the dewatering well, so that the problems of cracking and shrinkage are avoided, and leakage is avoided; the wall of the precipitation well is sealed by the putty type water swelling water stop piece, so that leakage is avoided, and the cost is low. Therefore, the waterproof structure has a good waterproof effect, reduces the hidden danger of leakage, and is simple in construction process and low in cost.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a waterproof construction of underground foundation ditch precipitation well, includes the well casing that extends along upper and lower direction, its characterized in that: the waterproof structure further includes:
a bentonite layer formed of bentonite filled in a lower portion of the well pipe;
a steel fiber concrete layer formed due to steel fiber concrete filled in the well pipe, the steel fiber concrete layer being positioned above the bentonite layer; and
and the putty type water swelling and stopping piece surrounds the outer wall of the well pipe.
2. The waterproof structure according to claim 1, characterized in that: the bentonite is sodium bentonite.
3. The waterproof structure according to claim 1, characterized in that: the putty type water swelling water stopping piece is formed by winding a putty type water swelling water stopping strip on the outer wall of the well pipe.
4. The waterproof structure according to claim 3, characterized in that: the waterproof well casing is characterized in that a concrete layer is arranged outside the upper part of the well casing, and the putty type water swelling water stop piece is located between the well casing and the concrete layer.
5. The waterproof structure according to claim 4, characterized in that: the waterproof structure is characterized in that a concrete cushion is arranged below the concrete layer, waterproof coiled materials are paved on the concrete cushion, the concrete layer is formed on the waterproof coiled materials, and the putty type water swelling water stopping piece and the sealant are arranged between the waterproof coiled materials.
6. The waterproof structure according to claim 5, characterized in that: the lower end of the steel fiber concrete layer is lower than the concrete cushion layer.
7. The waterproof structure according to claim 1, characterized in that: the waterproof structure further comprises a waterproof cover plate for closing the upper end of the well pipe.
8. The waterproof structure according to claim 7, characterized in that: the upper end of the well pipe has a ring of outwardly extending flanges, and the water-tight cover plate is securely connected to the flanges.
9. A waterproof method of a dewatering well of an underground foundation pit is characterized by comprising the following steps:
A. forming a concrete pad around a well pipe of the dewatering well;
B. paving a waterproof coiled material on the concrete cushion layer;
C. sealing a gap between the waterproof coiled material and the outer wall of the well pipe by using a sealant;
D. the putty type water-swelling water stop piece is arranged on the outer wall of the well pipe in a surrounding manner;
E. pouring bottom plate concrete to form a bottom plate concrete layer;
F. filling bentonite into the lower part of the well pipe to form a bentonite layer;
G. filling steel fiber concrete into the well pipe, and forming a steel fiber concrete layer on the bentonite layer;
H. fastening a waterproof cover plate on the upper end of the well pipe;
I. and pouring concrete to seal the well pipe and the waterproof cover plate to form a bottom plate post-pouring belt.
10. The waterproofing method according to claim 9 wherein in step D, a putty-type water-swellable water stop is wound around the outer wall of the well pipe by one turn; and/or in the step F, the height of the bentonite layer is not less than 1 m; and/or in the steps F and G, vibrating by adopting an inserted vibrating rod; and/or in the step F, the lower end of the steel fiber concrete layer is lower than the concrete cushion layer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005915.1A CN112832279B (en) | 2021-01-05 | 2021-01-05 | Waterproof structure and method for dewatering well of underground foundation pit |
| PCT/CN2021/107152 WO2022147999A1 (en) | 2021-01-05 | 2021-07-19 | Waterproof structure and method for underground foundation pit dewatering well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110005915.1A CN112832279B (en) | 2021-01-05 | 2021-01-05 | Waterproof structure and method for dewatering well of underground foundation pit |
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| CN112832279A true CN112832279A (en) | 2021-05-25 |
| CN112832279B CN112832279B (en) | 2022-10-21 |
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| WO (1) | WO2022147999A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113622442A (en) * | 2021-08-05 | 2021-11-09 | 浙江二十冶建设有限公司 | Plugging method for dewatering well |
| WO2022147999A1 (en) * | 2021-01-05 | 2022-07-14 | 江苏凯伦建材股份有限公司 | Waterproof structure and method for underground foundation pit dewatering well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115045342B (en) * | 2022-08-10 | 2022-11-01 | 衡橡科技股份有限公司 | Water-swelling plugging ring for pile-first packer and using method thereof |
| CN115369900B (en) * | 2022-08-12 | 2024-06-11 | 山西四建集团有限公司 | Comprehensive atrial backfill dewatering well sealing method |
| CN116005730A (en) * | 2022-12-09 | 2023-04-25 | 中建八局第二建设有限公司 | Basement bottom plate water drainage hole structure and construction method thereof |
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| CN113622442A (en) * | 2021-08-05 | 2021-11-09 | 浙江二十冶建设有限公司 | Plugging method for dewatering well |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022147999A1 (en) | 2022-07-14 |
| CN112832279B (en) | 2022-10-21 |
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