CN113216198A - Well sealing method for relief well of foundation pit large bottom plate - Google Patents
Well sealing method for relief well of foundation pit large bottom plate Download PDFInfo
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- CN113216198A CN113216198A CN202110611552.6A CN202110611552A CN113216198A CN 113216198 A CN113216198 A CN 113216198A CN 202110611552 A CN202110611552 A CN 202110611552A CN 113216198 A CN113216198 A CN 113216198A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—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)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a well sealing method of a relief well of a large base plate of a foundation pit, which comprises the steps of 1.1, preparation work before well sealing, 1.2 and a well sealing process of the relief well, wherein 1.1, the preparation work comprises the steps of descending the water level of the foundation pit, excavating the foundation pit, completing a plurality of concrete supports of the foundation pit, gradually cutting off well pipes of the relief well above an excavation surface, and continuously keeping the pumping working condition of the relief well; 1.2, manufacturing a well sealing valve assembly, installing the well sealing valve assembly, performing well sealing pouring twice and closing up mortar; the invention adopts the well sealing valve component to change the large-caliber well mouth into the small-caliber well mouth, so that the final moment of well sealing of the relief well of the deep foundation pit is finished in an on-off state, the original dynamic well sealing and closing process is instantly changed into a static process, and the underground water source is cleanly cut off. The invention has the advantages of simple process, clear operation procedure, greatly reduced construction difficulty and good well sealing effect.
Description
Technical Field
The invention relates to the technical field of foundation construction of large buildings, in particular to a well sealing method for a relief well of a large bottom plate of a foundation pit.
Background
Along with the rapid development of urban construction, the construction quantity of large buildings is increased greatly, in the construction process of the large buildings, construction is completed from excavation of a deep foundation pit to the deep foundation pit, the underground dewatering process implemented by dewatering wells accompanies all the time, after the concrete large bottom plate of the deep foundation pit is completed, the functions of the dewatering wells are converted into relief wells, the relief wells are mainly required to be sealed, the sealing of the relief wells seems simple, the well sealing methods in the prior art are many, but the method with simple process and good well sealing effect is a phoenix feather bone angle, and particularly for the sealing of the relief wells of the deep foundation pits, as underground water continuously overflows in the well sealing process, the sealing process of the wells is a dynamic process, and the defects of complex construction process, high construction difficulty and unsatisfactory well sealing effect generally exist.
Disclosure of Invention
The invention aims at the deficiency of the prior art and provides a well sealing method of a foundation pit large-bottom relief well, the invention is formed by step 1.1, preparation work before well sealing and 1.2, well sealing process of relief well, its 1.1, include the decline of the water level of the foundation pit, the foundation pit excavates, finish several concrete supports of the foundation pit, cut off the relief well pipe above the excavation face one by one, the relief well continues to keep pumping the operating mode; 1.2, manufacturing a well sealing valve assembly, installing the well sealing valve assembly, performing well sealing pouring twice and closing up mortar; the invention adopts the well sealing valve component to change the large-caliber well mouth into the small-caliber well mouth, so that the final moment of well sealing of the relief well of the deep foundation pit is finished in an on-off state, the original dynamic well sealing and closing process is instantly changed into a static process, and the underground water source is cleanly cut off. The invention has the advantages of simple process, clear operation procedure, greatly reduced construction difficulty and good well sealing effect.
The specific technical scheme for realizing the purpose of the invention is as follows:
a well sealing method for a relief well of a large base plate of a foundation pit is characterized by comprising the following steps:
1.1, preparation work before well sealing:
1.1.1, implementing foundation pit excavation along with the reduction of the water level of the foundation pit, and completing the first concrete support of the foundation pit; cutting off the well pipe of the relief well above the excavation surface, reserving the original water pumping pipe in the well pipe of the relief well, and continuously keeping the water pumping working condition of the relief well;
1.1.2, continuously carrying out foundation pit excavation to finish second concrete support of the foundation pit; cutting off the well pipe of the relief well above the excavation surface, reserving the original water pumping pipe in the well pipe of the relief well, and continuously keeping the water pumping working condition of the relief well;
the steps 1.1.1 and 1.1.2 are circulated until the last concrete support of the foundation pit is completed; cutting off the well pipe of the relief well above the excavation surface, keeping the opening of the well pipe of the relief well lower than the upper plane elevation of the large bottom plate by 5-10 cm, keeping the original water pumping pipe in the well pipe of the relief well, and continuously keeping the water pumping working condition of the relief well;
1.1.3, implementing the cushion layer construction of the large bottom plate of the foundation pit, and welding two water stop steel plates on the outer side of a well pipe of the relief well between the upper plane of the cushion layer and the upper plane elevation of the large bottom plate;
1.1.4, implementing the concrete pouring construction of the large bottom plate of the foundation pit, pouring two water stop steel plates outside a well pipe of the relief well and the large bottom plate into a whole, and finishing a curing period of the large bottom plate concrete; the original water pumping pipe in the well pipe of the relief well is reserved, and the relief well continues to maintain the water pumping working condition;
1.2, a well sealing procedure of a relief well:
1.2.1, manufacturing a well sealing valve assembly, wherein the well sealing valve assembly consists of a water pumping steel pipe, a stop valve and a support base plate; the water pumping steel pipe is divided into two sections which are respectively arranged at the water inlet and the water outlet of the stop valve, the supporting bottom plate is an annular plate, and the supporting bottom plate is sleeved on the water pumping steel pipe at the water inlet end of the stop valve and welded;
1.2.2, installing a well shut-in valve assembly, and cutting off an original water pumping pipe in a well pipe of the relief well at a well pipe opening of the relief well, wherein the water pumping pipe in the well pipe is connected with a water pumping steel pipe at a water inlet of a stop valve, the water pumping pipe outside the well pipe is connected with a water pumping steel pipe at a water outlet of the stop valve, the stop valve is in an open state, and the relief well continues to maintain a water pumping working condition;
placing a support base plate of the well sealing valve assembly in a well pipe of the relief well, and enabling the position of a stop valve to be lower than the upper opening of the well pipe of the relief well; welding a bottom supporting plate of the well sealing valve assembly with the inner wall of a well pipe of the relief well;
1.2.3, pouring for the first sealing well, pouring waterproof concrete above a supporting bottom plate between the inner wall of a well pipe of the relief well and the outer wall of a pumping steel pipe, wherein the height of the first poured waterproof concrete is flush with a cushion layer of a large bottom plate of the foundation pit, and when the waterproof concrete completes a maintenance period, the relief well continues to maintain a pumping working condition;
1.2.4, performing second well sealing pouring, closing a stop valve of a well sealing valve assembly, and cutting off a water pumping steel pipe at the water outlet end of the stop valve, wherein the upper opening of the water pumping steel pipe is 10-30 cm lower than the upper opening of a well pipe of the relief well; pouring waterproof concrete into the relief well pipe, namely above the stop valve, wherein the height of the waterproof concrete poured for the second time is flush with the mouth of the relief well pipe, and arranging an upper cover on the mouth of the relief well pipe and welding the upper cover after the waterproof concrete completes the maintenance period;
1.2.5, closing the mortar, filling the opening of the well of the relief well with the mortar, and leveling the opening of the well with the plane elevation on the large bottom plate.
The outer diameter of the support base plate is matched with the inner diameter of a well pipe of the relief well, and the inner diameter of the support base plate is matched with the outer diameter of the pumping steel pipe.
The invention adopts the technical scheme that a well sealing valve component is arranged in a relief well pipe, a support base plate of the well sealing valve component is welded with the inner wall of a relief well pipe, a large-caliber well mouth of an original relief well pipe is changed into a small-caliber well mouth of a pumping steel pipe, a stop valve is adopted, the final moment of well sealing of the relief well of a deep foundation pit is finished in an on-off state, the original dynamic well sealing and closing process is instantly changed into a static process, an underground water source is cleanly cut off, and well sealing is finished. The invention has the advantages of simple process, clear process steps, greatly reduced construction difficulty and good well sealing effect.
Drawings
FIG. 1 is a schematic view of a foundation pit in a working state after a first concrete supporting relief well is completed;
FIG. 2 is a schematic view of a foundation pit in a working state after a second concrete support relief well is completed;
FIG. 3 is a schematic structural view of a foundation pit welded with a water stop steel plate on a well pipe of a relief well after completion of cushion construction;
FIG. 4 is a schematic structural view of a pressure reducing well casing pipe with a water stop steel plate and a large bottom plate cast with concrete;
FIG. 5 is a schematic structural diagram of a shut-in valve assembly;
FIG. 6 is a schematic view of the assembly of the shut-in valve assembly with a relief well casing;
FIG. 7 is a schematic structural view of a first casting of waterproof concrete;
FIG. 8 is a schematic structural view of a second casting of waterproof concrete;
FIG. 9 is a schematic view showing the structure of the upper cover of the upper opening of the well casing for relief well.
Detailed Description
Example (b):
the invention comprises the following steps:
1.1, preparation work before well sealing:
referring to fig. 1, 1.1.1, the foundation pit excavation is implemented along with the reduction of the water level of the foundation pit, and the first concrete support of the foundation pit is completed; and cutting off the well pipe 3 of the relief well above the excavation surface, keeping the original water pumping pipe 4 in the well pipe 3 of the relief well, and keeping the working condition of pumping water continuously by the relief well.
Referring to fig. 2, 1.1.2, continuing to implement excavation of the foundation pit, and completing second concrete support of the foundation pit; cutting off the well pipe 3 of the relief well above the excavation surface, keeping the original water pumping pipe 4 in the well pipe 3 of the relief well, and continuously keeping the working condition of water pumping by the relief well;
the steps 1.1.1 and 1.1.2 are circulated until the last concrete support of the foundation pit is completed; and cutting off the well pipe 3 of the relief well above the excavation surface, keeping the opening of the well pipe 3 of the relief well lower than the upper plane elevation 10cm of the large bottom plate, keeping the original pumping pipe 4 in the well pipe 3 of the relief well, and keeping the pumping condition of the relief well.
Referring to fig. 3 and 1.1.3, constructing a foundation pit large bottom plate cushion layer 5, welding two water stop steel plates 1 on the outer side of a well pipe 3 of the relief well between the level of the upper plane of the cushion layer 5 and the level of the upper plane of the large bottom plate, wherein the distance between the two water stop steel plates 1 is 5 cm, and the welding seam is full and dense.
Referring to fig. 4, 1.1.4, implementing the concrete pouring construction of the large bottom plate of the foundation pit, pouring two water stop steel plates 1 outside a well pipe 3 of the relief well and the large bottom plate into a whole, and waiting for the large bottom plate concrete to finish the maintenance period; the original water pumping pipe 4 in the well pipe 3 of the relief well is reserved, and the relief well continues to maintain the water pumping working condition.
1.2, a well sealing procedure of a relief well:
referring to fig. 5, 1.2.1, manufacturing a well shut-in valve assembly 2, wherein the well shut-in valve assembly 2 is composed of a water pumping steel pipe 21, a stop valve 22 and a bottom supporting plate 23; the water pumping steel pipe 21 is divided into two sections which are respectively arranged at the water inlet and the water outlet of the stop valve 22, the support bottom plate 23 is an annular plate, the support bottom plate 23 is sleeved on the water pumping steel pipe 21 at the water inlet end of the stop valve 22 and welded, and a welding seam is full and compact.
Referring to fig. 5 and 6, 1.2.2, installing a well shut-in valve assembly 2, cutting off an original water pumping pipe 4 in a well pipe 3 of the relief well at a port of the well pipe 3 of the relief well, wherein the water pumping pipe 4 positioned in the well pipe is connected with a water pumping steel pipe 21 at a water inlet of a stop valve 22, the water pumping pipe 4 positioned outside the well pipe is connected with a water pumping steel pipe 21 at a water outlet of the stop valve 22, the stop valve 22 is in an open state, and the relief well continues to maintain a water pumping working condition;
placing a bottom supporting plate 23 of the well sealing valve assembly 2 in a well opening of the relief well, and enabling the position of a stop valve 22 to be lower than the upper opening of a well pipe 3 of the relief well; and welding the bottom supporting plate 23 of the well sealing valve assembly 2 with the inner wall of the well pipe 3 of the relief well, wherein the welding seam is full and compact.
Referring to fig. 7, 1.2.3, the first well sealing pouring is carried out, waterproof concrete is poured above the supporting bottom plate 23 between the inner wall of the well pipe 3 of the relief well and the outer wall of the pumping steel pipe 21, the height of the first pouring of the waterproof concrete 6 is flush with the cushion layer 5 of the large bottom plate of the foundation pit, and the relief well continues to maintain the pumping working condition after the waterproof concrete completes the maintenance period.
Referring to fig. 8 and 9, 1.2.4, performing second well sealing pouring, closing a stop valve 22 of the well sealing valve assembly 2, and cutting off a water pumping steel pipe 21 at the water outlet end of the stop valve 22, wherein the upper opening of the water pumping steel pipe 21 is 30cm lower than the upper opening of a well pipe 3 of the relief well; pouring waterproof concrete in the well pipe 3 of the relief well, namely above the stop valve 22, pouring the waterproof concrete 7 for the second time, wherein the height of the waterproof concrete is flush with the opening 3 of the well pipe of the relief well, finishing the maintenance period of the waterproof concrete, arranging an upper cover 8 at the opening 3 of the well pipe of the relief well and welding the upper cover 8, and enabling the welding seam to be full and compact.
1.2.5, closing the mortar, filling the mortar in the well pipe 3 openings of the relief well, and leveling the mortar with the plane elevation on the large bottom plate.
Referring to fig. 5 and 6, the outer diameter of the bottom plate 23 is matched with the inner diameter of the well pipe 3 of the relief well, and the inner diameter is matched with the outer diameter of the pumping steel pipe 21.
Claims (2)
1. A well sealing method for a relief well of a large base plate of a foundation pit is characterized by comprising the following steps:
1.1, preparation work before well sealing:
1.1.1, implementing foundation pit excavation along with the reduction of the water level of the foundation pit, and completing the first concrete support of the foundation pit; cutting off the well pipe (3) of the relief well above the excavation surface, reserving the original water pumping pipe (4) in the well pipe (3) of the relief well, and continuously keeping the working condition of water pumping by the relief well;
1.1.2, continuously carrying out foundation pit excavation to finish second concrete support of the foundation pit; cutting off the well pipe (3) of the relief well above the excavation surface, reserving the original water pumping pipe (4) in the well pipe (3) of the relief well, and continuously keeping the working condition of water pumping by the relief well;
the steps 1.1.1 and 1.1.2 are circulated until the last concrete support of the foundation pit is completed; cutting off the well pipe (3) of the relief well above the excavation surface, keeping the opening of the well pipe (3) of the relief well lower than the upper plane elevation of the large bottom plate by 5-10 cm, keeping the original water pumping pipe (4) in the well pipe (3) of the relief well, and keeping the working condition of pumping water continuously by the relief well;
1.1.3, constructing a foundation pit large bottom plate cushion layer (5), and welding two water stop steel plates (1) on the outer side of a well pipe (3) of the relief well between the upper plane of the cushion layer (5) and the upper plane elevation of the large bottom plate;
1.1.4, implementing the concrete pouring construction of the large bottom plate of the foundation pit, pouring two water stop steel plates (1) on the outer side of a well pipe (3) of the relief well and the concrete of the large bottom plate into a whole, and waiting for the concrete of the large bottom plate to finish a maintenance period; the original water pumping pipe (4) in the well pipe (3) of the relief well is reserved, and the relief well continues to maintain the water pumping working condition;
1.2, a well sealing procedure of a relief well:
1.2.1, manufacturing a well sealing valve assembly (2), wherein the well sealing valve assembly (2) consists of a water pumping steel pipe (21), a stop valve (22) and a support bottom plate (23); the water pumping steel pipe (21) is divided into two sections which are respectively arranged at the water inlet and the water outlet of the stop valve (22), the support base plate (23) is an annular plate, and the support base plate (23) is sleeved on the water pumping steel pipe (21) at the water inlet end of the stop valve (22) and welded;
1.2.2, installing a well shut-in valve assembly (2), and cutting off an original water pumping pipe (4) in a well pipe (3) of the relief well at the opening of the well pipe (3), wherein the water pumping pipe (4) positioned in the well pipe is connected with a water pumping steel pipe (21) at a water inlet of a stop valve (22), the water pumping pipe (4) positioned outside the well pipe is connected with the water pumping steel pipe (21) at a water outlet of the stop valve (22), the stop valve (22) is in an open state, and the relief well continues to maintain a water pumping working condition;
a bottom supporting plate (23) of the well sealing valve component (2) is arranged in a well opening of the relief well, so that the position of a stop valve (22) is lower than the upper opening of a well pipe (3) of the relief well; welding a bottom supporting plate (23) of the well sealing valve component (2) with the inner wall of a well pipe (3) of the relief well;
1.2.3, pouring for the first sealing well, pouring waterproof concrete above a support bottom plate (23) between the inner wall of a well pipe (3) of the relief well and the outer wall of a pumping steel pipe (21), wherein the height of the first poured waterproof concrete (6) is flush with a foundation pit large bottom plate cushion layer (5), and when the waterproof concrete completes a maintenance period, the relief well continues to maintain a pumping working condition;
1.2.4, pouring for the second sealing well, closing a stop valve (22) of the sealing valve assembly (2), cutting off a water pumping steel pipe (21) at the water outlet end of the stop valve (22), wherein the upper opening of the water pumping steel pipe (21) is lower than the upper opening of a well pipe (3) of the relief well; pouring waterproof concrete into the well pipe (3) of the relief well, namely above the stop valve (22), wherein the height of the second pouring of the waterproof concrete (7) is flush with the pipe orifice of the well pipe (3) of the relief well, and after the waterproof concrete finishes a curing period, arranging an upper cover (8) at the pipe orifice of the well pipe (3) of the relief well and welding the upper cover;
1.2.5, closing the mortar, filling the orifice of the well pipe (3) of the relief well with the mortar, and leveling the orifice with the plane elevation on the large bottom plate.
2. The method for sealing the relief well of the foundation pit large floor as claimed in claim 1, wherein the outer diameter of the backing plate (23) is matched with the inner diameter of the relief well pipe (3), and the inner diameter is matched with the outer diameter of the pumping steel pipe (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110611552.6A CN113216198A (en) | 2021-06-02 | 2021-06-02 | Well sealing method for relief well of foundation pit large bottom plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110611552.6A CN113216198A (en) | 2021-06-02 | 2021-06-02 | Well sealing method for relief well of foundation pit large bottom plate |
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| CN202110611552.6A Pending CN113216198A (en) | 2021-06-02 | 2021-06-02 | Well sealing method for relief well of foundation pit large bottom plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247426A (en) * | 2022-09-08 | 2022-10-28 | 中建八局第二建设有限公司 | Pipe well dewatering device capable of reducing water seepage of bottom plate and well sealing construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59177420A (en) * | 1983-03-28 | 1984-10-08 | Hazama Gumi Ltd | Prevention of outflow of filler in steel pipe sheet pile erection work |
| 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 |
| CN203429649U (en) * | 2013-07-09 | 2014-02-12 | 中国一冶集团有限公司 | Pressure reducing type blocking device of foundation pit dewatering well |
| CN106677198A (en) * | 2017-01-20 | 2017-05-17 | 上海长凯岩土工程有限公司 | Well plugging method under dynamic water level state |
| CN107460885A (en) * | 2017-09-22 | 2017-12-12 | 中国路桥工程有限责任公司 | A kind of relief well of deep foundation pit and its construction method |
| CN110318410A (en) * | 2019-06-27 | 2019-10-11 | 联建建设工程有限公司 | A kind of deep basal pit chance artesian water is prominent to gush decompression drought stress construction method |
| CN210917428U (en) * | 2019-09-16 | 2020-07-03 | 武汉市桥梁工程有限公司 | Deep basal pit relief well |
-
2021
- 2021-06-02 CN CN202110611552.6A patent/CN113216198A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177420A (en) * | 1983-03-28 | 1984-10-08 | Hazama Gumi Ltd | Prevention of outflow of filler in steel pipe sheet pile erection work |
| 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 |
| CN203429649U (en) * | 2013-07-09 | 2014-02-12 | 中国一冶集团有限公司 | Pressure reducing type blocking device of foundation pit dewatering well |
| CN106677198A (en) * | 2017-01-20 | 2017-05-17 | 上海长凯岩土工程有限公司 | Well plugging method under dynamic water level state |
| CN107460885A (en) * | 2017-09-22 | 2017-12-12 | 中国路桥工程有限责任公司 | A kind of relief well of deep foundation pit and its construction method |
| CN110318410A (en) * | 2019-06-27 | 2019-10-11 | 联建建设工程有限公司 | A kind of deep basal pit chance artesian water is prominent to gush decompression drought stress construction method |
| CN210917428U (en) * | 2019-09-16 | 2020-07-03 | 武汉市桥梁工程有限公司 | Deep basal pit relief well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115247426A (en) * | 2022-09-08 | 2022-10-28 | 中建八局第二建设有限公司 | Pipe well dewatering device capable of reducing water seepage of bottom plate and well sealing construction method |
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