CN115182369A - Dewatering well structure and pile foundation construction method reconstructed by utilizing dewatering well - Google Patents
Dewatering well structure and pile foundation construction method reconstructed by utilizing dewatering well Download PDFInfo
- Publication number
- CN115182369A CN115182369A CN202210904418.XA CN202210904418A CN115182369A CN 115182369 A CN115182369 A CN 115182369A CN 202210904418 A CN202210904418 A CN 202210904418A CN 115182369 A CN115182369 A CN 115182369A
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- Prior art keywords
- pipe
- grouting
- steel pipe
- dewatering well
- pit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 239000000463 material Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000002787 reinforcement Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
Abstract
The invention provides a dewatering well structure and a pile foundation construction method reconstructed by utilizing a dewatering well, which comprise the following steps: the steel pipe is used as a dewatering well main body, and a plurality of water guide holes are formed in the position, close to the bottom end, of the pipe wall of the dewatering well main body; the backfill filter material is arranged between the steel pipe and the well pit; the grouting pipe is arranged between the steel pipe and the backfill filter material and fixedly arranged on the outer wall of the steel pipe, a grouting device inserted into the bottom of the pit is installed at the bottom end of the grouting pipe, a plurality of grouting holes are formed in the pipe wall of the grouting pipe at intervals along the height direction, and outlets of the grouting holes face the backfill filter material; and water outside the well pit sequentially passes through the backfill filter material, the water guide hole and the pore diameter of the water filter pipe to be accumulated inside the steel pipe. The dewatering well structure is simple in structure and convenient and fast to construct; the structural advantages of the steel pipe well can be fully exerted, and the steel pipe well can be used as a structural foundation.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a dewatering well structure and a pile foundation construction method reconstructed by utilizing a dewatering well.
Background
Because of the needs of excavation operation, prevention of sudden gushing at the bottom of a pit and the like, a dewatering well needs to be arranged to reduce the underground water level when the foundation pit is excavated; the steel pipe is widely applied to the field of foundation pit engineering dewatering due to simple structure and convenient construction. More precipitation wells are arranged in the pit, so that foundation pit excavation and main structure construction are influenced, the precipitation wells are required to be plugged after the construction of a bottom plate structure, and the precipitation pipe wells above the bottom plate are cut off. The pipe well is used as a foundation pit dewatering structure, the bearing performance of the steel pipe is not exerted, and no related dewatering well structure can be used as a structural foundation. The two structures have no conflict in function, can be organically combined, and fully play the structural advantages of the steel pipe well, so that the steel pipe well can be used as a structural foundation.
In view of the above, there is a need to improve dewatering wells in the prior art to solve the above problems.
Disclosure of Invention
The invention aims to disclose a dewatering well structure and a pile foundation construction method reconstructed by utilizing a dewatering well.
In order to achieve the above object, the present invention provides a dewatering well structure, comprising:
the steel pipe is used as a dewatering well main body, and a plurality of water guide holes are formed in the position, close to the bottom end, of the pipe wall of the dewatering well main body;
the backfill filter material is arranged between the steel pipe and the well pit;
the grouting pipe is arranged between the steel pipe and the backfill filter material and fixedly arranged on the outer wall of the steel pipe, a grouting device inserted into the bottom of the pit is installed at the bottom end of the grouting pipe, a plurality of grouting holes are formed in the pipe wall of the grouting pipe at intervals along the height direction, and outlets of the grouting holes face the backfill filter material;
the sealing structure is arranged on the outer wall of the grouting pipe and used for temporarily sealing the outlet of the grouting hole, and the sealing structure can be punctured under a certain pressure provided inside the grouting pipe;
the strainer pipe is coaxially sleeved on the inner side of the steel pipe and close to the bottom end;
and water outside the pit is accumulated inside the steel pipe sequentially through the backfill filter material, the water guide hole and the aperture of the water filter pipe.
As a further improvement of the invention, the grouting pipes are arranged in plurality and are uniformly spaced around the circumference of the steel pipe.
As a further improvement of the invention, the material of the grouting pipe comprises, but is not limited to, a sleeve valve pipe and a metal pipe.
As a further improvement of the invention, the grouting pipe and the steel pipe are fixedly connected by welding.
As a further improvement of the invention, the sealing structure adopts a raw material belt or a plastic film.
The invention also provides a construction method of a pile foundation, which utilizes the dewatering well structure of any one of claims 1 to 5 to reform the dewatering well after the dewatering well is abandoned to carry out the construction of the pile foundation, and comprises the following steps:
s1, a slurry blocking pipe is arranged in the steel pipe in a manner of being attached to the inner wall of the steel pipe, a grouting core pipe is inserted into the grouting pipe, one end of the grouting core pipe extends to the bottom of the grouting pipe, the other end of the grouting core pipe is connected with a grouting pump, the grouting pump is used for grouting into the grouting core pipe, and the bottom of a pit is grouted and reinforced through the grouting device;
s2, gradually increasing the height of the grouting core pipe to realize layered grouting on the periphery of the steel pipe, so that gaps of the backfilled filter materials are filled and compacted by cement slurry;
s3, after cement paste outside the steel pipe is solidified, pulling out the grout blocking pipe, cutting off the steel pipe on the bottom plate of the foundation pit, then placing a reinforcement cage at the top of the steel pipe, meanwhile, extending out of the steel pipe from the top of the reinforcement cage, and fixedly connecting the reinforcement cage with the bottom plate through a steel bar;
and S4, finally, pouring concrete into the steel pipe by adopting a guide pipe normal method.
As a further improvement of the invention, the slurry blocking pipe is a PVC pipe.
Compared with the prior art, the invention has the beneficial effects that:
(1) A steel pipe is used as a main body of a precipitation well, a water guide hole is formed in the position, close to the bottom end, of the pipe wall of the steel pipe, a backfill filter material is filled between the steel pipe and a well pit, and a water filtering pipe is coaxially sleeved on the inner side of the steel pipe, so that the construction of the precipitation well is realized, water outside the well pit sequentially passes through the backfill filter material, and the water guide hole and the pore diameter of the water filtering pipe are accumulated in the steel pipe; the construction method comprises the steps of welding a grouting pipe on the outer wall of a steel pipe in advance, arranging a grouting device inserted into the bottom of a well pit at the bottom end of the grouting pipe, arranging a plurality of grouting holes in the pipe wall of the grouting pipe at intervals along the height direction, providing conditions for building a pile foundation with a structural foundation, facilitating utilization of a waste dewatering well, and promoting foundation pit engineering design and construction development.
(3) A construction method of a pile foundation is characterized in that a grouting core pipe is introduced into a grouting pipe, grouting is sequentially carried out on the bottom of a well pit and a backfill filter material region, grouting of a backfill filter material is carried out layer by layer from the bottom end to the top end, a soft soil layer at the bottom of the pit can be reinforced, gaps in the backfill filter material layer are filled, the side frictional resistance and the pile end bearing capacity of a foundation can be obviously improved, the characteristics of high bearing capacity and high frictional resistance of the backfill filter material at the periphery of the pipe are fully exerted, the bearing capacity of the foundation and the stability of a foundation pit are improved, a dewatering well can serve as a pile foundation, the bearing performance of the dewatering well is fully exerted, the number of structural pile foundations is effectively reduced, and resource waste caused by incapability of repeated utilization is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a dewatering well in a dewatering well structure and a pile foundation construction method reconstructed by utilizing the dewatering well according to the invention;
FIG. 2 is a schematic view showing the connection of the steel pipes and the grouting pipes in the dewatering well structure and the pile foundation construction method using the dewatering well reconstruction according to the present invention;
fig. 3 is a schematic position diagram of a steel pipe, a grouting pipe and a backfill filter material in a down-view manner in the dewatering well structure and the pile foundation construction method transformed by the dewatering well according to the invention;
fig. 4 is a flow diagram of a dewatering well structure and a pile foundation construction method reconstructed by the dewatering well according to the invention.
In the figure: 1. a steel pipe; 2. a water filter pipe; 3. a grouting pipe; 4. backfilling the filter material; 5. a reinforcement cage; 10. A water guide hole; 30. grouting holes; 31. a grouting device.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and that functional, methodological, or structural equivalents thereof, which are equivalent or substituted by those of ordinary skill in the art, are within the scope of the present invention.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 to 4 show an embodiment of a dewatering well structure and a pile foundation construction method using dewatering well reconstruction according to the present invention.
Referring to fig. 1 and 3, a dewatering well structure is characterized by comprising: the steel pipe 1 is used as a main body of the dewatering well, and by utilizing the excellent bearing performance of the dewatering well, a plurality of water guide holes 10 are formed in the position, close to the bottom end, of the pipe wall of the steel pipe, so that the functional characteristics of the dewatering well are met, water in the foundation pit is gathered in the steel pipe 1 through the water guide holes 10 and is pumped out by a water pump, and the water level line in the foundation pit is reduced; the backfill filter material 4 is arranged between the steel pipe 1 and the well pit; the grouting pipe 3 is arranged between the steel pipe 1 and the backfill filter material 4 and fixedly arranged on the outer wall of the steel pipe 1, a grouting device 31 inserted into the bottom of the pit is installed at the bottom end of the grouting pipe 3, a plurality of grouting holes 30 (shown in figure 2) are arranged on the pipe wall of the grouting pipe 3 at intervals along the height direction, and the outlets of the grouting holes 30 are arranged towards the backfill filter material 4; a sealing structure disposed on an outer wall of the grout pipe 3 for temporarily sealing an outlet of the grout hole 30, and the sealing structure can be punctured under a certain pressure provided inside the grout pipe 3; the strainer pipe 2 is coaxially sleeved on the inner side of the steel pipe 1 and close to the bottom end;
it is understood that water outside the well pit sequentially passes through the backfill filter material 4, the water guide hole 10 and the aperture of the water filter pipe 2 and is accumulated inside the steel pipe 1; the backfill filter materials 4 realize first-layer filtration of underground water, the water guide holes 10 formed in the steel pipes 1 realize second-layer filtration, and the water filter pipes 2 realize third-layer filtration, so that sludge cannot be generated inside the steel pipes 1, the function of a dewatering well can be realized, and the improvement of the dewatering well as the structural pile foundation is facilitated.
Specifically, a plurality of grouting pipes 3 are arranged and evenly spaced around the circumference of the steel pipe 1, and the grouting pipes 3 are made of materials including, but not limited to, sleeve valve pipes and metal pipes. The grouting pipe 3 is fixedly connected with the steel pipe 1 by welding. The sealing structure adopts raw material belts or plastic films.
Referring to fig. 4, the invention also discloses a construction method of the pile foundation, which is used for reconstructing the dewatering well after the dewatering well is abandoned to carry out the construction of the pile foundation and comprises the following steps: s1, a slurry blocking pipe is arranged in the steel pipe 1 and is attached to the inner wall of the steel pipe 1, a grouting core pipe is inserted into a grouting pipe 3, one end of the grouting core pipe extends to the bottom of the grouting pipe 3, the other end of the grouting core pipe is connected with a grouting pump, the grouting core pipe is grouted by the grouting pump, and the bottom of a pit is grouted and reinforced by a grouting device 31; s2, gradually increasing the height of the grouting core pipe to realize layered grouting on the periphery of the steel pipe 1, so that gaps of the backfill filter materials 4 are tightly filled with cement slurry; s3, after cement paste outside the steel pipe 1 is solidified, pulling out the grout blocking pipe, cutting off the steel pipe 1 on the base plate of the foundation pit, then placing the reinforcement cage 5 at the top of the steel pipe 1, meanwhile, extending the top of the reinforcement cage 5 out of the steel pipe 1, and fixedly connecting the reinforcement cage 5 with the base plate through a reinforcement; and S4, finally, pouring concrete into the steel pipe 1 by adopting a guide pipe normal direction. The slurry blocking pipe is a PVC pipe.
It should be understood that, in this embodiment, the pit bottom soft soil layer can be reinforced by grouting the pit bottom, the bearing capacity of the foundation and the stability of the foundation pit are improved, the inner space of the backfill filter material 4 layer is filled by grouting the periphery of the steel pipe 1, the side frictional resistance and the pile end bearing capacity of the foundation can be obviously improved, the characteristics of high bearing capacity and high frictional resistance of the backfill filter material 4 at the periphery of the pipe are fully exerted, after the grouting of the pipe bottom and the periphery of the pipe is completed, the reinforcement cage 5 is placed and fixed with the bottom plate steel bars, the concrete is poured in the steel pipe 1 to serve as the structural foundation, the bearing performance of the steel pipe 1 at the bottom of the pit can be fully utilized, the number of the structural pile foundations is effectively reduced, and the resource waste caused by the incapability of repeated utilization is avoided.
The dewatering well is simple in structure and convenient and fast to construct; the structural advantages of the steel pipe 1 well can be fully exerted, the steel pipe can be used as a structural foundation, the purpose of saving materials is achieved, the construction period can be obviously shortened, and the steel pipe has extremely high popularization and use values.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A dewatering well structure, comprising:
the steel pipe is used as a dewatering well main body, and a plurality of water guide holes are formed in the position, close to the bottom end, of the pipe wall of the dewatering well main body;
the backfill filter material is arranged between the steel pipe and the well pit;
the grouting pipe is arranged between the steel pipe and the backfill filter material and fixedly arranged on the outer wall of the steel pipe, a grouting device inserted into the bottom of the pit is installed at the bottom end of the grouting pipe, a plurality of grouting holes are formed in the pipe wall of the grouting pipe at intervals along the height direction, and outlets of the grouting holes face the backfill filter material;
the sealing structure is arranged on the outer wall of the grouting pipe and used for temporarily sealing the outlet of the grouting hole, and the sealing structure can be punctured under a certain pressure provided inside the grouting pipe;
the strainer is coaxially sleeved on the inner side of the steel pipe and close to the bottom end;
and water outside the pit is accumulated inside the steel pipe sequentially through the backfill filter material, the water guide hole and the aperture of the water filter pipe.
2. The dewatering well structure according to claim 1, wherein the grouting pipes are arranged in plurality and evenly spaced around the circumference of the steel pipe.
3. Dewatering well structure according to claim 1, characterized in that the grouting pipes are made of materials including, but not limited to, sleeve valve pipes and metal pipes.
4. The dewatering well structure according to claim 1, wherein the grouting pipes are fixedly connected with the steel pipes by welding.
5. The dewatering well structure according to claim 1, wherein the sealing structure is made of raw material tape or plastic film.
6. A construction method of a pile foundation, which utilizes the dewatering well structure of any one of claims 1 to 5 to reform the dewatering well after the dewatering well is abandoned, and is characterized by comprising the following steps:
s1, a slurry blocking pipe is arranged in the steel pipe in a manner of being attached to the inner wall of the steel pipe, a grouting core pipe is inserted into the grouting pipe, one end of the grouting core pipe extends to the bottom of the grouting pipe, the other end of the grouting core pipe is connected with a grouting pump, the grouting pump is used for grouting into the grouting core pipe, and the bottom of a pit is grouted and reinforced through the grouting device;
s2, gradually increasing the height of the grouting core pipe to realize layered grouting on the periphery of the steel pipe, so that gaps of the backfilled filter materials are filled and compacted by cement slurry;
s3, after cement paste outside the steel pipe is solidified, pulling out the grout blocking pipe, cutting off the steel pipe on the foundation pit bottom plate, then placing a reinforcement cage at the top of the steel pipe, extending out of the steel pipe from the top of the reinforcement cage, and fixedly connecting the reinforcement cage with the bottom plate through a reinforcement;
and S4, finally, pouring concrete into the steel pipe by adopting a guide pipe normal method.
7. A method for constructing a pile foundation as claimed in claim 6, wherein said grout blocking pipe is a PVC pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210904418.XA CN115182369A (en) | 2022-07-29 | 2022-07-29 | Dewatering well structure and pile foundation construction method reconstructed by utilizing dewatering well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210904418.XA CN115182369A (en) | 2022-07-29 | 2022-07-29 | Dewatering well structure and pile foundation construction method reconstructed by utilizing dewatering well |
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| Publication Number | Publication Date |
|---|---|
| CN115182369A true CN115182369A (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210904418.XA Pending CN115182369A (en) | 2022-07-29 | 2022-07-29 | Dewatering well structure and pile foundation construction method reconstructed by utilizing dewatering well |
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| CN (1) | CN115182369A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178289A (en) * | 2015-10-10 | 2015-12-23 | 江西建工第二建筑有限责任公司 | Prefabricated downcast pipe pile in building foundation pit and use method thereof |
| CN109881692A (en) * | 2019-03-22 | 2019-06-14 | 上海长凯岩土工程有限公司 | Pre-assembled dewatering well |
| CN110700240A (en) * | 2019-09-27 | 2020-01-17 | 中国一冶集团有限公司 | Grouting tubular pile and construction method thereof |
| CN111608171A (en) * | 2020-05-27 | 2020-09-01 | 中国一冶集团有限公司 | Sandbar underground soft base pipe, well precipitation anti-floating pipe pile structure and construction method |
| CN211498905U (en) * | 2019-12-25 | 2020-09-15 | 上海隧道工程有限公司 | Pressure reduction well with well wall compensation |
| CN213682180U (en) * | 2020-11-13 | 2021-07-13 | 中建八局天津建设工程有限公司 | Well plugging device for dewatering well |
| WO2021196657A1 (en) * | 2020-04-03 | 2021-10-07 | 山东大学 | Novel fabricated anchorage structure serving as both dewatering well and support, and construction method |
| CN113668582A (en) * | 2021-08-06 | 2021-11-19 | 中国联合工程有限公司 | Groutable double-wall pressure-bearing and pressure-reducing water pipe well device and construction method thereof |
| CN217053468U (en) * | 2022-03-30 | 2022-07-26 | 上海广联环境岩土工程股份有限公司 | Steel pressure reducing pipe well used as uplift pile |
-
2022
- 2022-07-29 CN CN202210904418.XA patent/CN115182369A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105178289A (en) * | 2015-10-10 | 2015-12-23 | 江西建工第二建筑有限责任公司 | Prefabricated downcast pipe pile in building foundation pit and use method thereof |
| CN109881692A (en) * | 2019-03-22 | 2019-06-14 | 上海长凯岩土工程有限公司 | Pre-assembled dewatering well |
| CN110700240A (en) * | 2019-09-27 | 2020-01-17 | 中国一冶集团有限公司 | Grouting tubular pile and construction method thereof |
| CN211498905U (en) * | 2019-12-25 | 2020-09-15 | 上海隧道工程有限公司 | Pressure reduction well with well wall compensation |
| WO2021196657A1 (en) * | 2020-04-03 | 2021-10-07 | 山东大学 | Novel fabricated anchorage structure serving as both dewatering well and support, and construction method |
| CN111608171A (en) * | 2020-05-27 | 2020-09-01 | 中国一冶集团有限公司 | Sandbar underground soft base pipe, well precipitation anti-floating pipe pile structure and construction method |
| CN213682180U (en) * | 2020-11-13 | 2021-07-13 | 中建八局天津建设工程有限公司 | Well plugging device for dewatering well |
| CN113668582A (en) * | 2021-08-06 | 2021-11-19 | 中国联合工程有限公司 | Groutable double-wall pressure-bearing and pressure-reducing water pipe well device and construction method thereof |
| CN217053468U (en) * | 2022-03-30 | 2022-07-26 | 上海广联环境岩土工程股份有限公司 | Steel pressure reducing pipe well used as uplift pile |
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