CN109930614B - Nondestructive construction method for deep foundation pit tube well operation closed bottom plate structure - Google Patents
Nondestructive construction method for deep foundation pit tube well operation closed bottom plate structure Download PDFInfo
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- CN109930614B CN109930614B CN201910293443.7A CN201910293443A CN109930614B CN 109930614 B CN109930614 B CN 109930614B CN 201910293443 A CN201910293443 A CN 201910293443A CN 109930614 B CN109930614 B CN 109930614B
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- pipe
- foundation pit
- well
- steel
- bottom plate
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 238000009412 basement excavation Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 241000353135 Psenopsis anomala Species 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000001066 destructive effect Effects 0.000 claims 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
Landscapes
- Foundations (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
When the deep foundation pit pipe well is operated and the closed bottom plate structure is constructed without damage, firstly, dewatering and earthwork excavation are carried out according to a foundation pit enclosure drawing, after earthwork is excavated to the bottom surface of a foundation pit, a dewatering well pipe is cut, a steel cover plate and a steel tray are manufactured, holes are formed at corresponding positions of the steel cover plate and the steel tray, a water pumping pipe sequentially penetrates through the steel cover plate and the steel tray and penetrates into the well pipe to a certain depth, firstly, a permeable material is filled into the bottom of the dewatering well pipe to be about 0.5 meter away from the bottom surface of the foundation pit, then the steel tray is put into the well pipe, slurry is injected into the well pipe to the top of the well pipe, the steel cover plate is covered, the part of the water pumping pipe outside the well pipe extends to the edge of the foundation pit and is connected with a self-priming pump, a cushion layer is constructed, a basement bottom plate is constructed, meanwhile, the dewatering well is normally operated, and after the underground structure reaches +/-0, dewatering construction is stopped, and the water pumping pipe is plugged. The base plate has better integrity, reduces the construction time and has higher economic value and engineering practical value.
Description
Technical Field
The invention relates to a dewatering well sealing system, in particular to a nondestructive construction method for a deep foundation pit pipe well operation closed bottom plate structure.
Background
In the foundation pit engineering, the foundation pit still needs to continuously reduce water in order to meet the anti-floating requirement before the underground structure is constructed to +/-0, so that the well needs to be sealed after the underground structure is constructed to +/-0. The conventional practice is as follows: the well sealing material consists of a steel pipe and a permeable steel plate, the permeable material is backfilled at the lower layer in the dewatering well, the quick setting concrete is backfilled at the upper part, and the concrete is secondarily poured in the steel pipe, so that the risk of leakage of underground water exists, the integrity of the well sealing material is weakened due to secondary pouring of the bottom plate at the dewatering well, and the construction speed is strictly controlled in high water level areas, so that the construction period is long.
Disclosure of Invention
In order to solve the technical problems, the invention provides a nondestructive construction method for a deep foundation pit pipe well operation closed bottom plate structure.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a nondestructive construction method for a deep foundation pit tube well operation closed bottom plate structure comprises the following construction steps:
s1, cutting a dewatering well pipe after earth excavation is carried out to the bottom surface of a foundation pit, so that the top of the well pipe is flush with the bottom of the foundation pit;
S2, manufacturing a steel cover plate and a steel tray, aligning the centers of the steel cover plate and the steel tray, and simultaneously forming holes at corresponding positions of the steel cover plate and the steel tray;
s3, enabling the water suction pipe to sequentially penetrate through holes of the steel cover plate and the steel tray and penetrate into the well pipe for a certain depth;
s4, filling the bottom of the dewatering well pipe with a permeable material at a certain distance from the bottom surface of the foundation pit, and then placing a steel tray on the permeable material;
s5, injecting slurry into a steel tray in the well pipe to the top of the well pipe;
s6, covering the manufactured steel cover plate on the top of the well pipe;
s7, extending the water suction pipe to the edge of the foundation pit along the cushion layer and connecting the water suction pipe with the self-sucking pump;
S7, constructing a cushion layer;
S8, constructing a bottom plate and an underground structure to +/-0;
S9, stopping precipitation construction, and injecting slurry with high concentration into the water pumping pipe or directly plugging the water pumping pipe by using a cover.
Further, the permeable material in the step S4 is melon seed slices or sand with good grading.
Further, the permeable material in the step S4 is filled to a position which is 0.5m away from the bottom surface of the foundation pit.
Further, the well pipe is a circular pipe, the steel tray is circular, the diameter of the steel tray is the same as the inner diameter of the well pipe, and the steel cover plate is circular, rectangular or square.
Further, the lower depth of the water pumping pipe penetrating into the steel tray is set according to actual precipitation needs.
Further, the thickness of the steel cover plate in the step S2 is 10-15 mm.
Further, the pumping pipe in the step S3 is a PVC hose, a PPR pipe, an iron pipe or a steel pipe.
Further, the slurry in the step S52 is micro-expansive concrete or cement mortar.
Further, the water pumping pipes are sealed at the connection positions of the holes of the steel cover plate and the steel tray.
Furthermore, the pumping pipe can be directly plugged by cement mortar or a cover with larger concentration.
Compared with the prior art, the invention has the beneficial effects that:
1. the steel plate and the steel pipe required by an original well are reduced, and the economic value is higher.
2. The hole reserved on the bottom plate is avoided, the secondary pouring of concrete is carried out, and the condition of groundwater leakage caused by the secondary pouring of concrete is avoided.
3. The bottom plate reinforcing bar need not break at the tube well department, and the bottom plate concrete once casts, therefore the structural integrity of bottom plate is better.
4. The construction time is shortened, and the construction progress is quickened.
The foregoing description is only an overview of the present invention, and may be implemented in accordance with the teachings of the present specification, so that the foregoing and other objects, features, and advantages of the present invention may be more readily understood, and further detailed description of the present invention may be had by reference to the accompanying drawings and examples, it being apparent that the examples described are some, but not all, of the embodiments of the invention.
Drawings
FIG. 1 is a plan view of a closed bottom plate structure for deep foundation pit pipe well operation according to the present invention.
FIG. 2 is a cross-sectional view of the structure of the closed bottom plate for the deep foundation pit pipe well operation of the invention.
Wherein: 1- -a structural backplane; 2- -cushion layer; 3-steel cover plate; 4-a water pumping pipe;
5-a steel pallet; 6-well pipe; 7-a water permeable material; 8-self priming pump.
Detailed Description
The invention discloses a closed bottom plate structure for deep foundation pit pipe well operation, which is shown in figures 1 and 2, and comprises a well pipe 6, a cushion layer 2 positioned at the upper end of the well pipe 6 and a steel cover plate 3 covered at the pipe orifice of the well pipe 6, wherein the pipe orifice of the well pipe 6 is leveled with the bottom of the cushion layer 2, the middle part of the steel cover plate 3 covers the pipe orifice of the well pipe in a whole way, the cushion layer 2 and the structural bottom plate 1 are paved above the steel cover plate 3, the lower end of the inner part of the well pipe 6 is filled with a permeable material 7, a steel tray 5 is arranged on the permeable material 7, through holes are formed in positions of the steel tray 5 corresponding to the steel cover plate 3, one end of a water pumping pipe 4 penetrates through the steel cover plate 3 and the steel tray 5 to penetrate into a certain depth of the permeable material 7, and the other end of the water pumping pipe 4 is connected with a self-sucking pump 8 after being paved along the cushion layer 2 to the edge of a foundation pit.
The invention relates to a nondestructive construction method of a closed bottom plate structure for deep foundation pit tube well operation, which comprises the steps of firstly carrying out dewatering and earth excavation according to a foundation pit enclosure drawing, cutting a dewatering well tube after earth excavation is carried out to the bottom surface of a foundation pit, manufacturing a steel cover plate and a steel tray, simultaneously perforating corresponding positions of the steel cover plate and the steel tray, sequentially penetrating a water pumping tube through the steel cover plate and the steel tray and deep into the well tube to a certain depth, firstly filling a permeable material into the bottom of the dewatering well tube to be about 0.5 meter away from the bottom surface of the foundation pit, then placing the steel tray, then injecting slurry into the well tube to the top of the well tube, covering the steel cover plate, enabling the part of the water pumping tube outside the well tube to extend to the edge of the foundation pit to be connected with a self-priming pump, then constructing a cushion layer and constructing a basement bottom plate, and stopping dewatering construction after the underground structure reaches +/-0, and plugging the water pumping tube.
According to the construction method for constructing the closed bottom plate structure of the deep foundation pit pipe well operation without damage, holes are formed in the positions corresponding to the steel cover plate and the steel tray, a water pumping pipe penetrates through the steel cover plate and the steel tray to penetrate into a permeable material in a well pipe to a certain depth, the other end of the water pumping pipe is paved along a cushion layer and extends to the edge of the foundation pit, then the cushion layer and a structural bottom plate (basement bottom plate) are constructed, meanwhile, a dewatering well works normally, and after the underground structure is constructed to +/-0, the dewatering well stops working, and the water pumping pipe is plugged. Through changing the water pumping path, need not to leave the hole on the bottom plate and carry out the secondary pouring of concrete, the groundwater seepage condition and the phenomenon of collapsing the hole that arouse because of the secondary pouring of concrete have been removed, and the bottom plate construction is not influenced by dewatering well can once only pour, the hole of reserving on the structure bottom plate when having avoided adopting traditional well sealing method, construction quality has been guaranteed, the wholeness of bottom plate is better, construction time has also been reduced simultaneously, steel sheet and steel pipe that original well required have been practiced thrift, have higher economic value and engineering practical value.
The present invention is not limited to the above-described specific embodiments, and it is apparent to those skilled in the art from the above-described idea that various modifications can be made without inventive step and without departing from the scope of the present invention.
Claims (9)
1. The nondestructive construction method for the deep foundation pit tube well operation closed bottom plate structure is characterized by comprising the following construction steps of:
s1, cutting a dewatering well pipe after earth excavation is carried out to the bottom surface of a foundation pit, so that the top of the well pipe is flush with the bottom of the foundation pit;
S2, manufacturing a steel cover plate and a steel tray, aligning the centers of the steel cover plate and the steel tray, and simultaneously forming holes at corresponding positions of the steel cover plate and the steel tray;
s3, enabling the water suction pipe to sequentially penetrate through holes of the steel cover plate and the steel tray and penetrate into the well pipe for a certain depth;
s4, filling the bottom of the dewatering well pipe with a permeable material at a certain distance from the bottom surface of the foundation pit, and then placing a steel tray on the permeable material;
S5, injecting slurry onto the steel tray to the top of the well pipe;
s6, covering the manufactured steel cover plate on the top of the well pipe;
S7, paving a part of the water suction pipe outside the well pipe to the edge of the foundation pit along the cushion layer, and connecting the part with the self-priming pump; constructing a cushion layer;
S8, constructing a bottom plate and an underground structure to +/-0;
s9, stopping precipitation construction, and injecting slurry into the water pumping pipe or directly plugging the water pumping pipe by using a cover.
2. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the permeable material in the step S4 adopts melon seed slices or gravel with good grading.
3. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the permeable material in the step S4 is filled to a position 0.5m away from the bottom surface of the foundation pit.
4. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the well pipe is a round pipe, the steel tray is round, the diameter of the steel tray is the same as the inner diameter of the well pipe, and the steel cover plate is round, rectangular or square.
5. The non-destructive construction method of a deep foundation pit pipe well operation closed bottom plate structure according to claim 1, wherein the depth of the pumping pipe penetrating into the lower part of the steel tray is set according to actual precipitation requirements.
6. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the thickness of the steel cover plate in the step S2 is 10-15 mm.
7. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the pumping pipe in the step S3 is a PVC hose, a PPR pipe, an iron pipe or a steel pipe.
8. The method for constructing the deep foundation pit pipe well operation closed bottom plate structure without damage according to claim 1, wherein the slurry in the step S5 is micro-expansion concrete or cement mortar.
9. The non-destructive construction method of a closed bottom plate structure for deep foundation pit pipe well operation according to claim 1, wherein the pumping pipes are sealed at the hole connection parts of the steel cover plate and the steel tray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910293443.7A CN109930614B (en) | 2019-04-12 | 2019-04-12 | Nondestructive construction method for deep foundation pit tube well operation closed bottom plate structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910293443.7A CN109930614B (en) | 2019-04-12 | 2019-04-12 | Nondestructive construction method for deep foundation pit tube well operation closed bottom plate structure |
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| Publication Number | Publication Date |
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| CN109930614A CN109930614A (en) | 2019-06-25 |
| CN109930614B true CN109930614B (en) | 2024-05-17 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110761291B (en) * | 2019-11-15 | 2024-06-07 | 中铁一局集团第二工程有限公司 | Anti-floating waterproof system and method applied to karst water-rich region deep foundation pit |
| CN115341566A (en) * | 2022-09-08 | 2022-11-15 | 中建八局第二建设有限公司 | Induction type well-sealing dewatering system and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343543A (en) * | 2013-07-09 | 2013-10-09 | 中国一冶集团有限公司 | Foundation pit dewatering well pressure-reduction-type plugging method |
| CN104420476A (en) * | 2013-08-27 | 2015-03-18 | 中建四局第一建筑工程有限公司 | Method and device using home-made small tube well to lower underground water level |
| CN107700469A (en) * | 2017-09-08 | 2018-02-16 | 浙江省水利河口研究院 | A kind of drainage arrangement and its application method of deformable anti-Liquefaction of Light Loam |
| CN207121916U (en) * | 2017-03-29 | 2018-03-20 | 南京南大岩土工程技术有限公司 | Shut-in well structure |
| CN207727600U (en) * | 2017-12-13 | 2018-08-14 | 中国一冶集团有限公司 | Plugging dewatering well device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10138616B2 (en) * | 2016-08-12 | 2018-11-27 | Wuhan Zhihe Geotechnical Engineering Co., Ltd. | Inverse construction method for deep, large and long pit assembling structure of suspension-type envelope enclosure |
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2019
- 2019-04-12 CN CN201910293443.7A patent/CN109930614B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343543A (en) * | 2013-07-09 | 2013-10-09 | 中国一冶集团有限公司 | Foundation pit dewatering well pressure-reduction-type plugging method |
| CN104420476A (en) * | 2013-08-27 | 2015-03-18 | 中建四局第一建筑工程有限公司 | Method and device using home-made small tube well to lower underground water level |
| CN207121916U (en) * | 2017-03-29 | 2018-03-20 | 南京南大岩土工程技术有限公司 | Shut-in well structure |
| CN107700469A (en) * | 2017-09-08 | 2018-02-16 | 浙江省水利河口研究院 | A kind of drainage arrangement and its application method of deformable anti-Liquefaction of Light Loam |
| CN207727600U (en) * | 2017-12-13 | 2018-08-14 | 中国一冶集团有限公司 | Plugging dewatering well device |
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| CN109930614A (en) | 2019-06-25 |
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