CN213267959U

CN213267959U - Foundation pit bottom drainage integrated system completed after underground water level rises

Info

Publication number: CN213267959U
Application number: CN202021857666.6U
Authority: CN
Inventors: 刘君帅; 徐文栋; 张海锋; 司徒钦; 张敏
Original assignee: BEIJING URBAN CONSTRUCTION ENGINEERING CO LTD
Current assignee: BEIJING URBAN CONSTRUCTION ENGINEERING CO LTD
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-05-25
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses a foundation ditch bottom drainage integrated system has been accomplished after groundwater level rises contains a foundation ditch bottom drainage integrated system has been accomplished after groundwater level rises, its characterized in that contains the foundation ditch of having accomplished the bottom plate construction, connects in the foundation slab of foundation ditch bottom, sets up the sump pit on the foundation slab, connects the well point dewatering system on ground outside the pit in the bright drainage system in the sump pit and connecting. The utility model is beneficial to discharge underground water in time and filtering during drainage through the arrangement of the open drainage system; through the arrangement of the water collecting pit, the filtering layer at the bottom of the water collecting pit and the adjacent discharge port of the bottom plate, the filter is beneficial to being intensively discharged; the arrangement of the adjacent discharge openings of the bottom plate can lead the underground water to be collected in a centralized way and is beneficial to ensuring that the foundation bottom plate does not crack; through the setting of well point dewatering system, do benefit to and continue the precipitation, make it reach follow-up construction design requirement, and support the application of regulating part, the mounted position of the open calandria of being convenient for on-the-spot regulation.

Description

Foundation pit bottom drainage integrated system completed after underground water level rises

Technical Field

The utility model belongs to foundation ditch construction field, in particular to after rising, completion foundation ditch bottom drainage integrated system underground water level.

Background

The control of the groundwater level is crucial in the construction of foundation pits, since groundwater has a significant influence on the forces on the bottom of the foundation pit and the durability of the foundation structure. Nowadays, the construction is mostly carried out the row that falls of groundwater in foundation ditch excavation process for ground water level stabilizes to the design height. When the underground water level rises suddenly due to the fact that the surrounding river system or rainfall for a long time, the foundation pit can not be constructed subsequently, the underground water level rises to the position where the underground water level does not reach the elevation of the foundation slab, engineering quality and safety accidents are easily caused, and if the soaking time is too long, the constructed bottom structure can be seriously damaged, so that the comprehensive drainage system capable of coping with the sudden rise of the underground water level is needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a foundation ditch bottom drainage integrated system has been accomplished to groundwater level after rising for solve groundwater level and rise, emergency drainage, multiple mode precipitation and drainage system's when especially suddenly rising to the foundation ditch bottom technical problem such as tissue installation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a comprehensive system for finishing drainage at the bottom of a foundation pit after the underground water level rises is characterized by comprising the foundation pit with the finished bottom plate construction, a foundation bottom plate connected to the bottom of the foundation pit, a water collecting pit arranged on the foundation bottom plate, a surface drainage system connected in the water collecting pit and a well point drainage system connected to the ground outside the pit;

the well point dewatering system comprises dewatering wells arranged at intervals along the periphery of the ground outside the pit, dewatering calandria connected to one side of each dewatering well, dewatering calandria connecting pipes connected between each dewatering well and each dewatering calandria, valves connected to the dewatering calandria connecting pipes, supporting and adjusting pieces connected to the dewatering calandria and the ground outside the pit, a sedimentation basin connected to a converging port of each dewatering calandria and an observation well connected to the ground outside the pit;

the open drainage system comprises an open drainage pipe arranged in the water collection pit, an open drainage filtering port connected with a bottom port of the open drainage pipe, a supporting rod connected between the open drainage pipe and the foundation bottom plate, a drainage pit arranged outside the foundation pit, a water suction pump connected on the open drainage pipe between the drainage pit and the water collection pit, and an observation point arranged on the foundation bottom plate outside the water collection pit.

Further, the foundation ditch contains and faces the drain with the soleplate of accomplishing and the bottom plate that ponding department set up on soleplate faces the drain, the bottom plate faces the drain and sets up in the sump pit bottom at least.

The system further comprises a supporting pile arranged in soil mass between the dewatering well and the top of the foundation pit and a boundary guardrail connected to the ground outside the pit above the supporting pile; the support piles are arranged at intervals along the edge of the foundation pit and are horizontally connected with connecting rods.

Furthermore, the supporting and adjusting part comprises a supporting plate vertically connected below the rainfall calandria and adjusting plates connected to the two ends of the supporting plate in the length direction; the adjusting plate is formed by connecting layers, and the height of the adjusting plate is adapted to the design height of the dewatering calandria.

Furthermore, the observation wells are at least four in four directions around the ground outside the pit, and are arranged in a encrypted manner at the local designed observation positions.

Furthermore, the dewatering calandria is formed by assembling in sections, supporting adjusting pieces are arranged on the front side and the rear side of the splicing position, and the dewatering calandria forms a closed loop and is connected with the sedimentation tank; the gradient of the dewatering calandria is not less than 3 per thousand.

Furthermore, the valve on the row's connecting pipe falls is manual or electric control, and electric control passes through the circuit individual control and is provided with total accuse switch, falls row's connecting pipe to the slope of row's of falling water pipe flow direction not less than 1 thousandth.

Furthermore, the sump pit comprises a rectangular or square pit body without a top cover and a filter layer arranged at the pit body, and the filter layer is arranged above the discharge port of the bottom plate.

Furthermore, the exposed pipe is connected to the bottom of the sump, at least one layer of detachable row filtering ports is arranged at the bottom of the exposed pipe, and the supporting rod on the exposed pipe comprises a vertical supporting rod and a horizontal connecting rod between the adjacent vertical supporting rods; the vertical bearing rods are assembled.

Furthermore, the observation points are at least arranged in four directions around the sump, and are in a locally-emphasized encrypted arrangement in design.

The beneficial effects of the utility model are embodied in:

1) the utility model is beneficial to discharge the underground water appearing at the foundation slab in time through the arrangement of the open drainage system; the suction port of the exposed exhaust pipe in the exposed exhaust system is provided with an exposed exhaust filtering port, so that filtering during drainage is facilitated;

2) the utility model is beneficial to discharge the groundwater from the bottom plate discharge port to the sump through the arrangement of the sump, the sump bottom filter layer and the bottom plate adjacent discharge port, and then the groundwater is filtered and concentrated in the sump and discharged; on one hand, the arrangement of the bottom plate adjacent discharge openings can lead the underground water to be collected in a centralized way, and on the other hand, the arrangement of the bottom plate adjacent discharge openings is beneficial to ensuring that other base bottom plates are not cracked under the action of the underground water;

3) the utility model is beneficial to continuously dewatering the underground water at the bottom of the foundation pit through the arrangement of the well point dewatering system, so that the underground water reaches the design requirement of subsequent construction, and the lower part of the exposed calandria in the well point dewatering system is used for supporting the adjusting part, so that the installation position of the exposed calandria can be conveniently adjusted on site;

the utility model is beneficial to real-time control of the change of the underground water level and the height of the foundation slab in the drainage process through the arrangement of the observation well and the observation point, so as to avoid uneven change caused by too fast or too slow precipitation; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.

Drawings

FIG. 1 is a schematic view of a completed foundation pit bottom drainage integrated system;

FIG. 2 is a schematic view of a well point dewatering system construction connection;

FIG. 3 is a partial schematic view of a well point dewatering system construction connection;

FIG. 4 is a schematic view of a sump and open row system construction connection;

FIG. 5 is a schematic view of the well point dewatering system and open drainage system installation arrangement connection;

FIG. 6 is a schematic view of construction connection of dewatering wells and dewatering calandria;

fig. 7 is a schematic view of sump bottom connection.

Reference numerals: 1-foundation pit, 11-foundation slab, 12-bottom slab adjacent discharge port, 2-building slab, 3-support pile, 4-well point dewatering system, 41-dewatering well, 42-dewatering discharge pipe, 43-observation well, 44-sedimentation tank, 45-dewatering discharge connecting pipe, 46-valve, 47-supporting plate, 48-adjusting plate, 5-water collection pit, 51-pit body, 52-filtering layer, 6-open discharge system, 61-open discharge pipe, 62-open discharge filtering port, 63-supporting rod, 64-water pump, 65-water discharge pit, 66-observation point, 7-boundary guardrail, 8-pit outer ground and 9-soil body.

Detailed Description

Taking a certain building construction as an example, the foundation is a raft foundation, and an integral shear wall structure is assembled; the bottom elevation of the water collecting bottom plate of the elevator shaft is 38.800 m; the bottom elevations of the foundation raft of the underground garage are 41.900m and 41.600m, and the bottom elevations of the anti-floating plate position raft are 40.600 m.

Because the reservoir opens the mode of draining, downstream water delivery, the flow is 10 cubic meters per second, leads to partial shallow groundwater monitoring well water level to appear the lifting. The waterproof protective layer at the bottom of the pit 5 of the garage and the main building under construction is cracked and then the waterproof protective layer is raised. Then, the bottom of a plurality of water collecting pits 5 appears with bulges and the phenomenon of water accumulation with small area appears, and the water level rises by 15-20cm every day with increasing severity.

The engineering slope support form is a slope protection pile, the depth of a foundation pit is about 15m, and three prestressed anchor rods are arranged. The underground water type is diving, the main aquifer is a pebble bed, the burial depth of the stable water level is 19.80-0.70 m, and the elevation of the stable water level is 36.04-36.31 m. The foundation bearing capacity is basically not influenced due to the water inrush condition; and under the condition that the water level does not exceed 500mm of the raft, the quality safety of the structure is not influenced; the anti-floating design is carried out according to the-5 m water level of the outdoor terrace reported by the geological survey, and the anti-floating design is not required to be modified by combining the historical water level condition.

As shown in fig. 1 to 7, a comprehensive system for draining water from the bottom of a foundation pit after the underground water level rises is adopted, which comprises the foundation pit 1 with the bottom plate constructed, a foundation bottom plate 11 connected to the bottom of the foundation pit 1, a water collecting pit 5 arranged on the foundation bottom plate 11, a clear drainage system 6 connected in the water collecting pit 5, and a well point dewatering system 4 connected to the ground 8 outside the pit. The foundation ditch contains and faces row mouth 12 with the foundation slab 11 of completion and the bottom plate that sets up in foundation slab 11 ponding department, and the bottom plate faces row mouth 12 and sets up at least in sump 5 bottoms. As shown in fig. 1, the bottom of the foundation pit 1 also contains a local distribution of the building floor 2.

As shown in fig. 2 and 3, the well point dewatering system 4 includes dewatering wells 41 arranged at intervals along the periphery of the ground surface 8 outside the pit, dewatering calandria pipes 42 connected to one side of the dewatering wells 41, dewatering calandria pipes 45 connected between the dewatering wells 41 and the dewatering calandria pipes 42, valves 46 connected to the dewatering calandria pipes 45, support adjusting members connected to the dewatering calandria pipes 42 and the ground surface 8 outside the pit, a settling pond 44 connected to the junction port of the dewatering calandria pipes 42, and an observation well 43 connected to the ground surface 8 outside the pit; the precipitation calandria 42 is formed by assembling in sections, and supporting adjusting pieces are arranged on the front side and the rear side of the splicing position, and the precipitation calandria 42 forms a closed loop and is connected with the sedimentation tank 44.

The foundation pit supporting structure further comprises supporting piles 3 arranged in soil 9 between the dewatering well 41 and the top of the foundation pit 1, and boundary guardrails 7 connected to the ground 8 outside the pit above the supporting piles 3. The support piles 3 are arranged at intervals along the edge of the foundation pit and are horizontally connected with connecting rods. The observation wells 43 are provided in four directions at least around the underground surface 8 of the pit, and are arranged in a manner of being encrypted at the partially designed observation positions.

In this embodiment, the main drainage pipeline of the drainage pipes 42 is made of steel pipes or double-layer corrugated pipes, and the diameter of the drainage pipes 42 is 400mm/800mm, so that multi-directional drainage can be adopted if necessary. The wellhead of the dewatering well 41 is provided with a protective lining and is covered. The inclination of the dewatering calandria 42 to the flow direction is preferably 1 per mill. A sedimentation tank 44 is arranged at the interface of the precipitation calandria 42 entering the municipal pipeline, the sedimentation tank 44 adopts a brick laying tank with the specification of 2.00m multiplied by 1.5m, and a short wall with the height of 1.00m is built in the middle of the tank; the water is firstly discharged into one half pool, and then flows into the other half pool after the water level is higher than 1.00m, so that the sand in the water can be deposited in the water inlet half pool.

As shown in fig. 4 and 5, the open drain system 6 includes an open drain pipe 61 disposed in the sump 5, an open drain filter port 62 connected to a bottom port of the open drain pipe 61, a support rod 63 connected between the open drain pipe 61 and the foundation floor 11, a drain pit 65 disposed outside the foundation pit 1, a suction pump 64 connected to the open drain pipe 61 between the drain pit 65 and the sump 5, and an observation point 66 disposed on the foundation floor 11 outside the sump 5. The sump 5 includes a rectangular or square pit body 51 without a top cover and a filter layer 52 provided at the pit body 51, the filter layer 52 being provided above the bottom plate adjacent to the discharge port 12.

As shown in fig. 5 and 6, the support adjusting member comprises a support plate 47 vertically connected below the precipitation drain pipe 42 and adjusting plates 48 connected to both longitudinal ends of the support plate 47; the adjusting plates 48 are formed by connecting layers, and the height of the adjusting plates 48 is suitable for the design height of the precipitation calandria 42.

In this embodiment, the peripheral dewatering calandria 42 of foundation ditch 1 is arranged at dewatering well 41 inboard, and every 5 ~ 8m supports the regulating part bearing through water, and wherein the regulating plate 48 is made through the brick building block, and backup pad 47 is made through plank or steel sheet, and the drain pipe is placed between two parties at backup pad 47.

In this embodiment, the valve 46 on the drop-exhaust connecting pipe 45 is controlled manually or electrically, and the electric control is controlled independently through a circuit and is provided with a master control switch.

As shown in fig. 7, the exposed drain pipe 61 is connected to the bottom of the sump 5, at least one layer of detachable row filtering ports is arranged at the bottom of the exposed drain pipe 61, and the supporting rod 63 on the exposed drain pipe 61 comprises a vertical supporting rod and a horizontal connecting rod between adjacent vertical supporting rods. The vertical bearing rods are assembled. The observation points 66 are arranged at least in four directions around the sump 5, and the observation points 66 are locally emphasized in the design of the encrypted arrangement.

During construction of the embodiment, the dewatering wells 41 are arranged at the distance of 1.5m from the upper opening line of the foundation pit 1 to the outer side of the foundation pit 1, the well spacing is 3.2m, and the dewatering wells 4194 are arranged. The settling pond 44 is disposed on the south side of the construction site. And during the peak period, water pumping amount is 1800 m/h every day, and the water level is obviously reduced after water pumping. After the water level descends, water pumping amount is 600 m/h every day, multiple points are adopted for pumping water, combined drainage is carried out by arranging multiple water pumping pumps 64, and drainage points are arranged in living areas and construction sites south courtyards. And arranging the staff for measuring and observing the water level of the well 43 and the water level in the foundation pit and forming a record. The sand content of pumped water is strictly controlled during pumping water; strict metering is carried out, and accurate metering is ensured; and reliable measures are taken to ensure the quality of the well sealing.

Because the supporting structure of the foundation pit 1 is completed, the well position of the dewatering well 41 is arranged to be closer to the foundation pit 1, and in order to improve the hole forming probability, hole collapse caused by disturbance to the surrounding soil 9 in the anchor cable construction process when a mud wall protection process is adopted for forming the well is avoided, so that a down-the-hole hammer is adopted for impacting the well. And pumping and draining the underground water by adopting a submersible pump with the flow rate of 32-50 m3/h and the lift of 35-40 m. The periphery of the foundation pit 1 is adjusted by adopting a phi 500mm steel pipe according to the actual situation on site, the foundation pit 1 to the sedimentation tank 44 are arranged on the ground along the periphery of the precipitation well 41, phi 800mm double-layer corrugated pipes are adopted, the sedimentation tank 44 is arranged according to the position of a site drainage outlet, and the gradient of a drainage pipeline is not less than 3 per thousand.

The early-stage open drainage system 6 is used for draining water, the middle-stage open drainage system 6 and the well point dewatering system 4 are constructed together, and the later-stage well point dewatering system 4 is used for draining water separately; after pumping down, the water should be pumped continuously, and the water pump and well pipe maintenance should be carried out one by one without interruption. When water is pumped, the water pumps can be started one by one at intervals for preventing the insufficient drainage capacity of the drainage pipe network due to the large water yield. After the water pumping is started, a water pumping test is carried out, and the water yield, the sand yield and the permeability coefficient of the aquifer of the single well are tested.

When the sand output of the dewatering well 41 is too large, the water pump can be lifted, and if the sand output is still large, the well should be washed again or the pump is stopped for well repair. 4 water level observation wells 43 are arranged. Before pumping water, the static water level should be observed for 2 times every day at the initial stage of pumping water, and after the water level is stable, the water level should be observed for 1 time every day, and the water level observation precision is +/-2 cm. When the dewatering well 41 is used, the power supply for pumping water is cut off, the underground water pump, the cable and the pump pipe are removed, and the dewatering well 41 is refilled with the clay soil in time.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.

Claims

1. A comprehensive system for finishing drainage at the bottom of a foundation pit after the underground water level rises is characterized by comprising the foundation pit (1) which finishes construction of a bottom plate, a foundation bottom plate (11) connected to the bottom of the foundation pit (1), a water collecting pit (5) arranged on the foundation bottom plate (11), a clear drainage system (6) connected in the water collecting pit (5) and a well point drainage system (4) connected to the ground (8) outside the pit;

the well point dewatering system (4) comprises dewatering wells (41) arranged at intervals along the periphery of the ground (8) outside the pit, dewatering calandria (42) connected to one side of the dewatering wells (41), a dewatering calandria connecting pipe (45) connected between the dewatering wells (41) and the dewatering calandria (42), a valve (46) connected to the dewatering calandria connecting pipe (45), a supporting and adjusting piece connected to the dewatering calandria (42) and the ground (8) outside the pit, a sedimentation basin (44) connected to a junction port of the dewatering calandria (42), and an observation well (43) connected to the ground (8) outside the pit;

the open drainage system (6) comprises an open drainage pipe (61) arranged in the water collecting pit (5), an open drainage filtering port (62) connected with the bottom port of the open drainage pipe (61), a supporting rod (63) connected between the open drainage pipe (61) and the foundation bottom plate (11), a drainage pit (65) arranged outside the foundation pit (1), a water suction pump (64) connected on the open drainage pipe (61) between the drainage pit (65) and the water collecting pit (5), and an observation point (66) arranged on the foundation bottom plate (11) outside the water collecting pit (5).

2. A completed foundation pit bottom drainage integrated system after the groundwater level has risen, as claimed in claim 1, wherein the foundation pit (1) comprises a completed foundation slab (11) and a slab face drain (12) provided at a water accumulation place on the foundation slab (11), the slab face drain (12) being provided at least at the bottom of the sump (5).

3. A comprehensive system for foundation pit bottom drainage completed after the groundwater level has risen, according to claim 1, further comprising a support pile (3) disposed in the soil body (9) between the precipitation well (41) and the top of the foundation pit (1), a boundary fence (7) connected to the ground (8) outside the pit above the support pile (3); the support piles (3) are arranged at intervals along the edge of the foundation pit (1) and are horizontally connected with connecting rods.

4. The system of claim 1, wherein the support adjusting member comprises a support plate (47) vertically connected below the dewatering discharge pipe (42) and adjusting plates (48) connected to both longitudinal ends of the support plate (47); the adjusting plates (48) are formed by connecting layers, and the height of the adjusting plates (48) is adapted to the design height of the rainfall calandria (42).

5. A comprehensive system for foundation pit bottom drainage completed after the groundwater level has risen according to claim 1, characterized in that the observation wells (43) are provided with four at least in four directions around the ground (8) outside the pit and are arranged densely at the local design observation.

6. The system of claim 1, wherein the dewatering calandria (42) is assembled in sections, and support adjusting members are arranged on the front side and the rear side of the assembly, and the dewatering calandria (42) forms a closed loop and is connected with the sedimentation basin (44); the gradient of the precipitation calandria (42) is not less than 3 per mill.

7. The system as claimed in claim 1, wherein the valve (46) on the water level lowering and draining connecting pipe (45) is controlled manually or electrically, the electric control is controlled independently through a circuit and is provided with a master control switch, and the gradient of the flow direction of the water level lowering and draining connecting pipe (45) to the water level lowering and draining pipe (42) is not less than 1 ‰.

8. Comprehensive system for foundation pit bottom drainage completed after groundwater level has risen, according to claim 1, characterized in that the sump (5) comprises a rectangular or square pit body (51) without a top cover and a filter layer (52) arranged at the pit body (51), the filter layer (52) is arranged above the bottom plate adjacent drainage opening (12).

9. The system of claim 1, wherein the exposed pipe (61) is connected to the bottom of the pit (5), the exposed pipe (61) is provided with at least one detachable row of filtering ports at the bottom, and the support rod (63) on the exposed pipe (61) comprises a vertical support rod and a horizontal connecting rod between adjacent vertical support rods; the vertical bearing rods are assembled.

10. The system of claim 1, wherein the observation points (66) are arranged at least in four directions around the pit (5), and the observation points (66) are arranged in a locally-designed and heavily-packed manner.