CN111501805A - Foundation pit bottom plate reserved precipitation plugging device and application method thereof - Google Patents
Foundation pit bottom plate reserved precipitation plugging device and application method thereof Download PDFInfo
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- CN111501805A CN111501805A CN202010295598.7A CN202010295598A CN111501805A CN 111501805 A CN111501805 A CN 111501805A CN 202010295598 A CN202010295598 A CN 202010295598A CN 111501805 A CN111501805 A CN 111501805A
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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
- 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
- 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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Abstract
The utility model provides a precipitation plugging device is reserved to foundation ditch bottom plate, includes steel pipe, water pump, fluke, its characterized in that: the diameter of the steel pipe is matched with that of the dewatering well pipe at the lower part of the bottom plate, the wall thickness of the steel pipe is more than or equal to 10mm, and the length of the steel pipe is more than or equal to 500 mm; the water pump is provided with a water pump water pumping steel pipe, the lower part of the water pump water pumping steel pipe is connected with the foundation pit water pumping steel pipe, and the upper part of the water pump water pumping steel pipe is connected with the water pump; the fluke is U-shaped reinforcing bar, and the both ends elbow length of U-shaped reinforcing bar is 100mm, and fluke length is 250 mm. The foundation pit base plate reserved rainfall plugging device has the advantages that the structure is simple, the manufacturing is convenient, the foundation pit rainfall plugging engineering is safe and reliable, the foundation pit rainfall plugging device becomes a filling-free rapid plugging device for the hole of the foundation pit reserved rainfall well, the construction is convenient, the plugging device is provided with a plurality of waterproof measures, the one-time plugging is powerfully guaranteed to be in place, and the engineering cost is reduced.
Description
Technical Field
The invention relates to a plugging device, in particular to a foundation pit bottom plate reserved precipitation plugging device and a using method thereof.
Background
With the vigorous development of construction projects in China, the number of corresponding foundation pit projects is continuously increased, the scale is increased, the depth of the foundation pit is deepened, and the foundation pit precipitation faces a new test under complex hydrogeological conditions. At present, foundation pits with large scale and deep depth are more in China, when a bottom plate is positioned in other strong permeable layers with pebbles and the like, pit-in-pit (water collecting pit, elevator shaft and the like) are influenced by underground water, construction difficulty is large, and secondary precipitation of a hole is reserved on a local bottom plate during foundation construction to ensure smooth construction of the pit-in-pit. However, the holes of the bottom plate are difficult to block due to the large underground water pressure of the parts, especially the traditional filling type blocking method is difficult to add under the condition that the dewatering wells around the foundation pit are stopped in the later period, and the direct blocking can cause more leakage gaps to be formed in the concrete under the water pressure, so that the construction compactness of the concrete cannot be ensured. Because long-term drainage makes most underground confined water gather in the precipitation well of this type of foundation ditch naturally, intangible greatly increased foundation ditch precipitation well water pressure and water yield, in case stop precipitation, the water level sharply rises, and great water pressure in the underground can directly lead to later stage bottom plate hole shutoff comparatively difficult.
Therefore, the known foundation pit bottom plate reserved precipitation plugging device has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a safe and reliable foundation pit bottom plate reserved rainfall plugging device.
The invention also aims to provide a safe and reliable use method of the foundation pit bottom plate reserved precipitation plugging device.
In order to achieve the purpose, the technical solution of the invention is as follows:
the utility model provides a precipitation plugging device is reserved to foundation ditch bottom plate, includes steel pipe, water pump, a plurality of fluke, its characterized in that:
the diameter of the steel pipe is matched with that of the dewatering well pipe at the lower part of the bottom plate, the wall thickness of the steel pipe is more than or equal to 10mm, and the length of the steel pipe is more than or equal to 500 mm; two water stopping wing rings with the space of 100mm are arranged on the outer side of the steel pipe; a plurality of bottom supports are arranged at the positions 50mm away from the bottom of the inner side of the steel pipe; two plugging steel plates with the thickness of 10mm are arranged at the bottom of the steel pipe, the diameter of one plugging steel plate is the same as the inner diameter of the steel pipe, and a DN75 water pump pumping pipe hole and a DN25 electric wire sleeve pipe hole are reserved in the center of the plugging steel plate;
the water pump is two submersible pumps, the water pump is provided with a water pump pumping steel pipe inserted into a dewatering well pipe, the specification of the water pump pumping steel pipe is DN75, the length of the water pump pumping steel pipe is more than or equal to 1m, the top of the water pump pumping steel pipe is provided with a gate valve, and the bottom of the water pump pumping steel pipe is connected with the water pump by a soft water belt; providing a wire steel sleeve DN25 with the length of 0.5m, and preparing a plug for the wire steel sleeve;
the fluke sets up the inboard at the steel pipe of gate valve top for U-shaped reinforcing bar is in pairs, and the both ends elbow length of U-shaped reinforcing bar is 100mm, and fluke length is 250 mm.
The foundation pit bottom plate reserved rainfall plugging device can be further realized by adopting the following technical measures.
The precipitation plugging device is reserved on the foundation pit base plate, wherein the steel pipe is a seamless steel pipe.
The dewatering plugging device is reserved on the foundation pit bottom plate, wherein the specification of the pumping steel pipe is equal to or larger than DN32 steel pipe.
The precipitation plugging device is reserved on the foundation pit bottom plate, wherein the U-shaped steel bars are III-grade steel bars with the diameter being more than or equal to 10 mm.
The dewatering plugging device is reserved on the foundation pit bottom plate, wherein the water stop wing ring is a steel plate with the width being more than or equal to 100 mm.
The dewatering plugging device is reserved on the foundation pit bottom plate, wherein the water stop wing ring is a steel plate with the thickness larger than or equal to 8 mm.
The dewatering plugging device is reserved on the foundation pit bottom plate, and the two water stop wing ring steel plates are perpendicular to the steel pipe axis.
The precipitation plugging device is reserved on the foundation pit bottom plate, wherein the bottom support is a supporting seat used for plugging the lower surface of the steel plate and provided with steel bar heads at equal intervals.
A use method of a foundation pit bottom plate reserved precipitation plugging device is characterized by comprising the following steps:
a. manufacturing foundation pit bottom plate reserved precipitation plugging device
According to the size of a square hole reserved on the foundation pit bottom plate and the diameter of a precipitation well pipe on the lower portion of the bottom plate, correspondingly manufactured foundation pit bottom plate reserved precipitation plugging devices are used in a matched mode;
b. steel pipe is fixed and steel pipe outside concrete placement, including the following step:
(1) placing a steel pipe on the upper part of a foundation pit bottom plate concrete well pipe for simple fixation, immediately putting a 1 st submersible pump into the bottom of the well from the steel pipe for normal pumping, sealing gaps between foundation pit bottom plate concrete and a steel pipe lining by using sealing ointment, and effectively bonding a waterproof coiled material with the outer wall of the steel pipe by using a hot melting method;
(2) concrete which is one grade higher than the foundation pit bottom plate concrete is adopted for the outer side of the steel pipe to carry out layered pouring and vibration compaction, and the curing time is longer than 14 days;
c. the welding of the plugging steel plate comprises the following steps:
(1) after concrete pouring and curing outside the steel pipe reach the set time, closing the 1 st submersible pump, lifting out of the well pipe, and replacing the 2 nd submersible pump to pump water; a water pump steel pipe and an electric wire sleeve are welded with a preformed hole of the plugging steel plate in advance, the height of the plugging steel plate from the top end of the water pump steel pipe is 100mm, and a No. 2 submersible pump is installed at the bottom end of the water pump steel pipe and protected by a gauze; when the 1 st submersible pump is put out, the 2 nd submersible pump is quickly put into the precipitation well together with the water pump steel pipe and the plugging steel plate, the length of the water pump pipe is not more than 0.3 time of the depth of the precipitation well, and the bottom of the precipitation well is connected with the water pump by a soft water belt;
(2) the plugging steel plate is stably placed on the bottom support of the plugging steel plate, and the 2 nd submersible pump is used for pumping water immediately;
(3) performing full-length welding on the steel pipe and the blocking steel plate after wiping the welding position by using a dry towel, wherein the height of a fillet weld leg meets the standard requirement, and the quality defects of meat biting and slag inclusion cannot occur;
(4) closing the gate valve and installing a finished wire casing plug when the strength of the concrete on the outer side of the steel pipe reaches 100%; the water level is raised, the pressure is increased, the welding line is checked, and the construction joint ensures no leakage, the observation time is not less than 7 days, and the next procedure can be carried out without any leakage;
(5) if water seepage occurs in the welding seam and the construction seam in the link, the gate valve is opened to continue precipitation;
d. pouring concrete on the inner side of the steel pipe, comprising the following steps:
(1) three layers of U-shaped steel bar anchor flukes are welded inside the steel pipe in a plum blossom shape at a distance of 200mm above the gate valve;
(2) the upper reinforcing steel bars of the bottom plate are pulled through from the top of the steel pipe and are welded and connected with the upper reinforcing steel bars of the concrete of the bottom plate of the peripheral foundation pit;
(3) and pouring concrete on the inner side of the steel pipe in a layered manner and vibrating the concrete on the outer side of the steel pipe to be compact, wherein the maintenance time is not less than 14 days, and the reserved precipitation plugging of the foundation pit bottom plate is completed.
The use method of the foundation pit bottom plate reserved precipitation plugging device can be further realized by adopting the following technical measures.
In the method, the water pumps are submersible pumps, and the number of the submersible pumps is two.
The method, wherein the concrete outside the steel pipe is C40P8 micro-expansion concrete
After the technical scheme is adopted, the foundation pit bottom plate reserved rainfall plugging device and the using method thereof have the following advantages:
1. the plugging device has simple structure and convenient manufacture;
2. the foundation pit dewatering plugging engineering is safe and reliable, and becomes a filling-free rapid plugging device for the reserved dewatering well opening of the bottom plate;
3. the construction is convenient, and plugging device establishes multichannel waterproofing measure, and the shutoff of forceful guarantee once targets in place, reduces engineering cost.
Drawings
FIG. 1 is a schematic structural view of an occluding device of an embodiment of the present invention;
FIG. 2 is a schematic structural view of another occlusion device in accordance with an embodiment of the invention;
FIG. 3 is a schematic view of concrete poured outside a steel pipe of the plugging device according to the embodiment of the invention;
FIG. 4 is a flow chart of a precipitation plugging construction process according to an embodiment of the invention;
FIG. 5 is a schematic diagram of concrete pouring on the upper part of the steel pipe according to the embodiment of the present invention.
In the figure: 1 water pump drinking-water pipe, 2 shutoff steel sheets, 3 steel pipes, 4 stagnant water wing rings, 5 electric wire cover tube holes, 6 end caps, 7 gate valves, 8 flukes, 9 collet, 10 foundation ditch bottom plates, 11 sealed oleamen, 12 steel pipes that draw water, 13 1 st immersible pump, 14 steel pipe outside concreting, 15 steel pipe inside concreting, 16 nd 2 immersible pump.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
The invention discloses a foundation pit bottom plate reserved rainfall plugging device which comprises a steel pipe, a water pump and an anchor claw.
Fig. 1 is a schematic structural diagram of an occlusion device according to an embodiment of the present invention. The diameter of the steel pipe 3 is matched with that of the dewatering well pipe at the lower part of the bottom plate, the wall thickness of the steel pipe is 10mm, and the length of the steel pipe is 500 mm; two water stopping wing rings 4 with the space of 100mm are arranged on the outer side of the steel pipe 3; a plurality of bottom supports 9 are arranged at the positions 50mm away from the bottom of the inner side of the steel pipe; the bottom of the steel pipe is provided with a 10mm thick plugging steel plate 2, the diameter of the plugging steel plate is the same as the inner diameter of the steel pipe, and a DN75 water pump pumping pipe hole and a DN25 electric wire sleeve pipe hole 5 are reserved in the center of the plugging steel plate; the steel pipe is seamless steel pipe, the steel pipe specification of drawing water is DN32 steel pipe. The bottom support is a supporting seat used for plugging the lower surface of the steel plate by reinforcing steel bar heads arranged at equal intervals. Fig. 2 is a schematic structural diagram of another occlusion device according to an embodiment of the invention.
The water pump is two submersible pumps, the water pump is provided with a water pump pumping pipe 1 inserted into a dewatering well pipe, the water pump pumping steel pipe 12 is DN75 in specification and 1m in length, the top of the water pump pumping pipe is provided with a gate valve 7, and the bottom of the water pump pumping pipe is connected with the water pump by a soft water belt; providing a wire steel sleeve DN25 with the length of 0.5m, and preparing a plug 6 for the wire steel sleeve; the water-stopping wing ring is a steel plate with the width of 100 mm. The water-stopping wing ring is a steel plate with the width of 100 mm. The water-stopping wing ring is a steel plate with the thickness of 8 mm. The two water stop wing ring steel plates are respectively vertical to the axis of the steel pipe.
The fluke sets up the inboard at the steel pipe of gate valve top for U-shaped reinforcing bar is in pairs, and the both ends elbow length of U-shaped reinforcing bar is 100mm, and fluke 8 length is 250 mm. The U-shaped reinforcing steel bar is a grade III reinforcing steel bar with the diameter of 10 mm.
Example 2
Fig. 4 is a flow chart of a precipitation plugging construction process according to an embodiment of the invention. The use method of the foundation pit bottom plate reserved precipitation plugging device comprises the following steps:
a. manufacturing foundation pit bottom plate reserved precipitation plugging device
And (3) according to the size of the square hole reserved on the foundation pit bottom plate 10 and the diameter of the precipitation well pipe on the lower part of the bottom plate, correspondingly manufacturing the foundation pit bottom plate reserved precipitation plugging device in a matched mode.
b. Fixing a steel pipe and pouring concrete on the outer side, comprising the following steps:
(1) the steel pipe is placed on the upper part of the original concrete well pipe and is simply fixed, and the No. 1 submersible pump 13 is immediately placed into the well bottom from the steel pipe to normally pump water. The distance between the top of the steel pipe with the length of 500mm and the structural surface of the bottom plate of the ground warehouse is 100mm (the thickness of the bottom plate is 400 mm), and the distance between the bottom of the steel pipe and the structural bottom of the bottom plate of the ground warehouse is 200 mm; after the steel pipe is in place, the steel pipe and the bottom ribs of the bottom plate of the ground reservoir are fixedly welded, and the periphery of the steel pipe is reinforced by 8 steel bars which are higher than the bottom plate steel bars by one level. The gap between the original concrete pipe and the inner lining of the steel pipe is sealed by adopting sealing ointment 11, and the waterproof coiled material is effectively bonded with the outer wall of the steel pipe by adopting a hot melting method. Fig. 3 is a schematic view of concrete poured outside a steel pipe of the plugging device according to the embodiment of the invention.
(2) The concrete 14 poured outside the steel pipe is C40/P8 micro-expansion concrete, which is improved by one grade compared with the original structural bottom plate concrete. Pouring in layers and vibrating to be compact, and the curing time is longer than 14 days.
c. The welding of the plugging steel plate comprises the following steps:
(1) and after the maintenance reaches the specified time, the 1 st submersible pump is closed and lifted out of the well, and the 2 nd submersible pump 16 is replaced to pump water. A submersible pump steel pipe and a wire sleeve are welded with the preformed hole of the plugging steel plate in advance, the height of the plugging steel plate from the top end of the water pump steel pipe is 100mm, a gate valve is installed, and a No. 1 submersible pump is installed at the bottom end of the water pump steel pipe and protected by a gauze; when the 1 st submersible pump is put forward, the 2 nd submersible pump is rapidly put into the precipitation well together with the water pump steel pipe and the plugging steel plate, the length of the water pump steel pipe is processed and installed according to the actual depth of the precipitation well, the length of the water pump pipe is not more than 0.3 time of the depth of the precipitation well, and the bottom of the water pump pipe is connected with the water pump by adopting a soft water belt.
(2) The blocking steel plate is guaranteed to be stably placed on a bottom support of the blocking steel plate, and the No. 2 submersible pump is used for pumping water immediately.
(3) And (3) performing full-length welding on the steel pipe and the blocking steel plate after the welding position is wiped by using a dry towel, wherein the leg height of a fillet weld meets the standard requirement, and quality defects such as meat biting, slag inclusion and the like cannot occur.
(4) Closing the gate valve and installing a finished wire casing plug when the strength of the concrete on the outer side of the steel pipe reaches 100%; the water level is raised, the pressure is increased, the welding line, the construction joint and the like are checked to ensure that no leakage phenomenon exists, the observation time is not less than 7 days, and the next procedure can be carried out without any leakage phenomenon.
(5) If water seepage occurs in the welding seam, the construction seam and the like in the link, the gate valve can be opened to continue precipitation, the treatment of the water seepage part is not influenced, and all hidden water leakage hazards are eliminated, so that the primary plugging qualification rate is more effectively ensured;
d. pouring concrete on the upper part of the steel pipe, comprising the following steps:
(1) three layers of U-shaped reinforcing steel bar anchor flukes are welded at intervals of 200mm and in a plum blossom shape inside the steel pipe, the U-shaped reinforcing steel bars are threaded reinforcing steel bars with the diameter of 10mm, the lengths of elbows at two ends are 100mm, the lengths of the anchor flukes are 250mm, and the integrity and the anti-surge stability of the foundation pit bottom plate are better improved. FIG. 5 is a schematic diagram of concrete pouring on the upper part of the steel pipe according to the embodiment of the present invention.
(2) And (4) pulling through the upper reinforcing steel bars of the bottom plate from the top of the steel pipe, and welding and connecting the upper reinforcing steel bars of the bottom plate with the upper reinforcing steel bars of the peripheral original ground storehouse, wherein the single-side welding is not less than 10 d.
(3) The steel pipe has an inner casting concrete 15 of the same grade as the outer casting concrete 14. The concrete adopts C40P8 micro-expansive concrete, is poured in layers and is compacted by vibration, and the curing time is not less than 14 days.
The invention has substantive characteristics and obvious technical progress, the foundation pit bottom plate reserves precipitation plugging device of the invention is a foundation pit bottom plate reserves precipitation well entrance to a cave fill-free rapid plugging device, when the bottom plate is in geology for the pit in the pebble other strong permeable stratum (sump pit, elevator shaft, etc.) influenced by the groundwater construction difficulty is greater, the partial bottom plate reserves the entrance to a cave secondary precipitation to ensure the pit in the pit to be constructed smoothly during the foundation construction. Thereby great water pressure in the underground can directly lead to the later stage bottom plate hole shutoff comparatively difficult, adopts the foundation ditch bottom plate to reserve precipitation well entrance to a cave plugging device construction can more convenient, effectual solution. Increase steel pipe device shutoff precipitation well in the bottom plate reservation hole, make the concrete can not receive the influence of groundwater at the in-process of pouring, such way can guarantee the smooth pouring of concrete, has improved concrete pouring's closely knit degree, and plugging device multichannel waterproof measure reduces the possibility of structure bottom plate infiltration, is convenient for inspect the seepage in advance and guarantees the shutoff quality, satisfies other requirements such as building service function.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (11)
1. The utility model provides a precipitation plugging device is reserved to foundation ditch bottom plate, includes steel pipe, water pump, a plurality of fluke, its characterized in that:
the diameter of the steel pipe is matched with that of the dewatering well pipe at the lower part of the bottom plate, the wall thickness of the steel pipe is more than or equal to 10mm, and the length of the steel pipe is more than or equal to 500 mm; two water stopping wing rings with the space of 100mm are arranged on the outer side of the steel pipe; a plurality of bottom supports are arranged at the positions 50mm away from the bottom of the inner side of the steel pipe; two plugging steel plates with the thickness of 10mm are arranged at the bottom of the steel pipe, the diameter of one plugging steel plate is the same as the inner diameter of the steel pipe, and a DN75 water pump pumping pipe hole and a DN25 electric wire sleeve pipe hole are reserved in the center of the plugging steel plate;
the water pump is two submersible pumps, the water pump is provided with a water pump pumping steel pipe inserted into a dewatering well pipe, the specification of the water pump pumping steel pipe is DN75, the length of the water pump pumping steel pipe is more than or equal to 1m, the top of the water pump pumping steel pipe is provided with a gate valve, and the bottom of the water pump pumping steel pipe is connected with the water pump by a soft water belt; providing a wire steel sleeve DN25 with the length of 0.5m, and preparing a plug for the wire steel sleeve;
the fluke sets up the inboard at the steel pipe of gate valve top for U-shaped reinforcing bar is in pairs, and the both ends elbow length of U-shaped reinforcing bar is 100mm, and fluke length is 250 mm.
2. The foundation pit floor reserved precipitation plugging device of claim 1, wherein the steel pipe is a seamless steel pipe.
3. The foundation pit bottom plate reserved precipitation plugging device as claimed in claim 1, wherein the specification of the pumping steel pipe is more than or equal to DN32 steel pipe.
4. The foundation pit bottom plate reserved precipitation plugging device as claimed in claim 1, wherein the U-shaped steel bars are III-grade steel bars with the diameter being more than or equal to 10 mm.
5. The foundation pit bottom plate reserved precipitation plugging device as claimed in claim 1, wherein the water stop wing ring is a steel plate with a width of more than or equal to 100 mm.
6. The foundation pit bottom plate reserved precipitation plugging device as claimed in claim 1, wherein the water stop wing ring is a steel plate with the thickness of more than or equal to 8 mm.
7. The foundation pit floor reserved precipitation plugging device of claim 1, wherein the two water stop wing ring steel plates are perpendicular to the steel pipe axis.
8. The foundation pit floor reserved precipitation plugging device as claimed in claim 1, wherein the bottom support is provided with equally spaced steel bar heads as a support seat for plugging the lower surface of the steel plate.
9. The use method of the foundation pit floor reserved precipitation plugging device according to claim 1 is characterized by comprising the following steps:
a. manufacturing foundation pit bottom plate reserved precipitation plugging device
According to the size of a square hole reserved on the foundation pit bottom plate and the diameter of a precipitation well pipe on the lower portion of the bottom plate, correspondingly manufactured foundation pit bottom plate reserved precipitation plugging devices are used in a matched mode;
b. steel pipe is fixed and steel pipe outside concrete placement, including the following step:
(1) placing a steel pipe on the upper part of a foundation pit bottom plate concrete well pipe for simple fixation, immediately putting a 1 st submersible pump into the bottom of the well from the steel pipe for normal pumping, sealing gaps between foundation pit bottom plate concrete and a steel pipe lining by using sealing ointment, and effectively bonding a waterproof coiled material with the outer wall of the steel pipe by using a hot melting method;
(2) concrete which is one grade higher than the foundation pit bottom plate concrete is adopted for the outer side of the steel pipe to carry out layered pouring and vibration compaction, and the curing time is longer than 14 days;
c. the welding of the plugging steel plate comprises the following steps:
(1) after concrete pouring and curing outside the steel pipe reach the set time, closing the 1 st submersible pump, lifting out of the well pipe, and replacing the 2 nd submersible pump to pump water; a water pump steel pipe and an electric wire sleeve are welded with a preformed hole of the plugging steel plate in advance, the height of the plugging steel plate from the top end of the water pump steel pipe is 100mm, and a No. 2 submersible pump is installed at the bottom end of the water pump steel pipe and protected by a gauze; when the 1 st submersible pump is put out, the 2 nd submersible pump is quickly put into the precipitation well together with the water pump steel pipe and the plugging steel plate, the length of the water pump pipe is not more than 0.3 time of the depth of the precipitation well, and the bottom of the precipitation well is connected with the water pump by a soft water belt;
(2) the plugging steel plate is stably placed on the bottom support of the plugging steel plate, and the 2 nd submersible pump is used for pumping water immediately;
(3) performing full-length welding on the steel pipe and the blocking steel plate after wiping the welding position by using a dry towel, wherein the height of a fillet weld leg meets the standard requirement, and the quality defects of meat biting and slag inclusion cannot occur;
(4) closing the gate valve and installing a finished wire casing plug when the strength of the concrete on the outer side of the steel pipe reaches 100%; the water level is raised, the pressure is increased, the welding line is checked, and the construction joint ensures no leakage, the observation time is not less than 7 days, and the next procedure can be carried out without any leakage;
(5) if water seepage occurs in the welding seam and the construction seam in the link, the gate valve is opened to continue precipitation;
d. pouring concrete on the inner side of the steel pipe, comprising the following steps:
(1) three layers of U-shaped steel bar anchor flukes are welded inside the steel pipe in a plum blossom shape at a distance of 200mm above the gate valve;
(2) the upper reinforcing steel bars of the bottom plate are pulled through from the top of the steel pipe and are welded and connected with the upper reinforcing steel bars of the concrete of the bottom plate of the peripheral foundation pit;
(3) and pouring concrete on the inner side of the steel pipe in a layered manner and vibrating the concrete on the outer side of the steel pipe to be compact, wherein the maintenance time is not less than 14 days, and the reserved precipitation plugging of the foundation pit bottom plate is completed.
10. The use method of the foundation pit bottom plate reserved precipitation plugging device according to claim 9, wherein the water pumps are submersible pumps, and the number of the submersible pumps required is two.
11. The use method of the foundation pit bottom plate reserved precipitation plugging device as claimed in claim 9, wherein the concrete outside the steel pipe is C40P8 micro-expansion concrete.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227395A (en) * | 2020-10-13 | 2021-01-15 | 机械工业勘察设计研究院有限公司 | Well sealing device and method for large-water-pressure-drop well in building raft |
| CN112647524A (en) * | 2020-12-18 | 2021-04-13 | 中国五冶集团有限公司 | Plugging method for dewatering well in foundation pit |
| CN113982007A (en) * | 2021-08-12 | 2022-01-28 | 中建四局第五建筑工程有限公司 | Enclosed construction behind sump pit is reserved in basement bottom plate post-cast strip |
| CN114045849A (en) * | 2021-09-30 | 2022-02-15 | 珠海十字门中央商务区建设控股有限公司 | Foundation pit high-temperature bedrock crack water drainage and plugging structure and method |
| CN116537238A (en) * | 2023-07-04 | 2023-08-04 | 北京建工集团有限责任公司 | Plugging method for dry well under water-carrying operation environment |
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| CN112647524A (en) * | 2020-12-18 | 2021-04-13 | 中国五冶集团有限公司 | Plugging method for dewatering well in foundation pit |
| CN113982007A (en) * | 2021-08-12 | 2022-01-28 | 中建四局第五建筑工程有限公司 | Enclosed construction behind sump pit is reserved in basement bottom plate post-cast strip |
| CN114045849A (en) * | 2021-09-30 | 2022-02-15 | 珠海十字门中央商务区建设控股有限公司 | Foundation pit high-temperature bedrock crack water drainage and plugging structure and method |
| CN116537238A (en) * | 2023-07-04 | 2023-08-04 | 北京建工集团有限责任公司 | Plugging method for dry well under water-carrying operation environment |
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