CN219261074U - Pump dewatering structure is buried at foundation ditch tank bottom - Google Patents

Abstract

The utility model discloses a precipitation structure of a buried pump at the bottom of a foundation pit. The foundation pit bottom buried pump dewatering structure comprises a water pump buried region and a water pumping pipe guide groove, wherein the water pump buried region is excavated downwards from the foundation pit bottom, and the water pumping pipe guide groove is excavated to one side from the water pump buried region. The water pump is arranged in the water pump embedded area, pebbles and broken stones are sequentially filled in the water pump embedded area, and waterproof cloth is arranged on the upper portion of the water pump embedded area. The water suction pipe and broken stone of the water pump are arranged in the water suction pipe guide groove. According to the utility model, the pumping pipe is led out by the buried pump to carry out dewatering, so that a well pipe is eliminated, the adverse effects of later leakage of the well pipe and use of a building caused by imprecise drainage well Feng Jing are solved, the later well sealing is avoided, the construction period is saved, and the construction cost is saved. Meanwhile, the problems of large underground water volume and inconvenient construction of the local area of the substrate are solved.

Description

Pump dewatering structure is buried at foundation ditch tank bottom

Technical Field

The utility model belongs to the technical field of building construction, in particular to the technical field of deep foundation pit construction, and particularly relates to a foundation pit bottom buried pump dewatering structure.

Background

In the deep foundation pit excavation process, when the groundwater level is higher than the foundation of the building to be built, foundation pit dewatering or water interception measures are needed, and dewatering or water interception is adopted to realize that the groundwater is drained below the working surface of the foundation pit. However, due to the complexity of geological conditions, the groundwater is sometimes required to be drained in a drain dewatering well reserved in the substrate after the groundwater is dug to the bottom of the tank.

In addition, for the local deepened parts such as a tank bottom water collecting pit, an elevator shaft and the like, if water is met during excavation, local independent precipitation or water interception measures are often adopted. When separate precipitation is adopted, precipitation wells can be arranged around the water collecting pit and the elevator shaft or inside the water collecting pit and the elevator shaft.

Whether the dewatering well is a substrate dewatering well or a water collecting pit or an elevator shaft is independently arranged, the dewatering well is required to be plugged in the later period, if the dewatering well is not plugged, the bearing capacity of a foundation can be influenced because the dewatering well is of a hollow structure, so that plugging measures are required to be taken for the dewatering well, the plugging is generally performed by adopting poured concrete or poured quick setting cement paste, and then a reserved well pipe is welded and sealed by adopting a steel plate.

When adopting concrete or grout to carry out the shutoff, under the effect that the water pump stopped pumping groundwater to rise, often there is the not dense situation of concrete or grout shutoff, and the shutoff is not dense and will make there is the cavity under the bottom plate, influences the foundation bearing capacity. In addition, the wellhead closed steel plate is in a corrosive environment for a long time, and the steel plate is likely to leak for a long time, so that the later-stage basement use is affected.

The existing dewatering technology of the traditional foundation pit dewatering well mainly comprises the steps that a dewatering well is arranged in a foundation pit independently, a filter tube is arranged in the well, filter materials are buried around the filter tube, in order to maintain continuous water pumping during construction, a well tube in a raft range is replaced by a steel tube with the same diameter, in order to prevent underground water from leaking along the wall of the steel tube, a water stop ring is welded on the outer side of the steel tube, when the structural construction meets the condition of the dewatering well, a water pump is or is not put forward to directly fill concrete into the well tube to plug the dewatering well according to the condition, or when the water inflow amount of underground water is large, a concrete filling measure can be adopted after filling double-liquid slurry, and after filling concrete into the well tube of a raft section, the well tube is sealed by a steel plate welded well tube. Besides replacing the raft well pipe with a steel pipe with the same diameter, a closed steel plate can be buried at the lower part of the cushion layer, a small-diameter steel pipe is welded at the upper part of the steel plate, a pumping pipe is led out through the small-diameter steel pipe to continue pumping water, quick setting cement paste is poured into the well pipe through the small-diameter steel pipe in the later well sealing process, and the steel plate is used for sealing and welding the steel pipe after the dewatering well is sealed. The defect synthesis of the existing foundation pit dry well dewatering technology can be summarized as the following 4 points: 1) After dewatering is stopped, the well pipe is required to be plugged by pouring concrete or cement paste; 2) The corrosion and leakage of the drain well wellhead plugging steel plate are possible; 3) The later well sealing not only increases the construction period, but also increases the manufacturing cost; 4) The well sealing of the dry well is generally carried out in a basement, and the construction is inconvenient.

Disclosure of Invention

The utility model mainly aims to provide a foundation pit bottom embedded pump dewatering structure, which is characterized in that a water pumping pipe is led out through an embedded pump to carry out dewatering so as to cancel a well pipe, solve the problems of later leakage of the well pipe and adverse influence on the use of a building caused by imprecise drainage well Feng Jing, avoid later well sealing, save construction period and save construction cost. Meanwhile, the problems of large underground water volume and inconvenient construction of the local area of the substrate are solved. The utility model aims at realizing the following technical scheme:

the utility model provides a foundation ditch tank bottom buries pump precipitation structure, includes the water pump buries the regional and digs to the drinking-water pipe guide slot of one side from the water pump buries the regional from foundation ditch tank bottom downward excavation; the water pump embedded area is internally provided with a water pump, pebbles, broken stones and waterproof cloth, and the water suction pipe guide groove of the water suction pipe is internally provided with a water suction pipe and broken stones of the water pump; the lower part of the water pump embedded region is filled with pebbles, the water pump is obliquely arranged in the region filled with the pebbles and the pebbles are over the top surface, broken stones are filled above the region filled with the pebbles, and the waterproof cloth is arranged above the broken stones in the water pump embedded region; the water pumping pipe is led out to the outer side of the foundation pit groove through the water pumping pipe guide groove, and broken stone is filled in the water pumping pipe guide groove except the space where the water pumping pipe is arranged and is connected with broken stone in the water pump embedded area; a foundation pit bottom concrete cushion layer is arranged above the waterproof cloth in the water pump embedded area and above the broken stone in the water pumping pipe guide groove; the minimum particle size of the pebbles is larger than the maximum particle size of the broken stones; the area of the upper opening of the water pump embedded region is larger than the area of the bottom of the region.

Further optimizing, wherein the minimum grain size of the pebbles is not less than 5cm, the average grain size is not less than 8cm, and the maximum grain size is not more than 10cm; the maximum particle size of the broken stone is not more than 30mm, and the minimum particle size is not less than 10mm.

Further optimizing, wherein the upper opening of the water pump embedded region is square, and the side length of the upper opening is 1.4-1.6 m; the longitudinal depth of the water pump embedded area is 0.9-1.1 m.

Further, the longitudinal section of the water pump embedded area is isosceles trapezoid with wide upper part and narrow lower part.

Further, the water pumping pipe guide groove is located 18-22 cm below the foundation pit concrete cushion layer.

The existing foundation pit dewatering technology needs to construct a dewatering well, filter pipes are arranged in the dewatering well, pumping pipes need to penetrate out of raft plates, the filter pipes of the raft plates need to be replaced by steel pipes, after dewatering is stopped in the later period, the dewatering well needs to be plugged by concrete or cement slurry, and a well pipe port needs to be welded with a closed steel plate. The technology of the utility model does not need to arrange a filter tube, a raft section does not need to be embedded with a steel tube, a pumping tube is led out from below a substrate, and well sealing is not needed after precipitation is stopped.

The utility model has the beneficial effects that:

(1) The well pipe is not required to be buried, the steel pipe is not required to be buried in the well pipe, and well sealing is not required in the later stage.

(2) The water pumping pipe is led out from the bottom of the cushion layer, does not penetrate through the bottom plate, and does not affect the structural construction.

(3) No special finished product protection measures are needed, and the construction is convenient.

(4) Short construction period, simple operation and good groundwater control effect.

The utility model will be described in further detail with reference to the drawings and the detailed description.

Drawings

FIG. 1 is a schematic diagram of the whole structure of a foundation pit bottom embedded pump dewatering structure;

FIG. 2 is a schematic diagram of the foundation pit bottom embedded pump dewatering structure.

Reference numerals:

1. a water pump; 2. a water pumping pipe; 3. pebbles; 4. breaking stone; 5. waterproof cloth.

Detailed Description

Example 1

As shown in fig. 1 and 2, the water-pumping and dewatering structure buried at the bottom of the foundation pit comprises a water pump buried region excavated downwards from the bottom of the foundation pit and a water pumping pipe guide groove excavated to one side from the water pump buried region; the water pump burying area is internally provided with a water pump 1, pebbles 3, broken stones 4 and waterproof cloth 5, and the water suction pipe guide groove is internally provided with a water suction pipe 2 and broken stones 4 of the water pump 1. The lower part of the water pump embedded region is filled with pebbles 3, the water pump 1 is obliquely arranged in the region filled with the pebbles 3, the pebbles 3 are arranged on the top surface, broken stones 4 are filled above the region filled with the pebbles 3, and waterproof cloth 5 is arranged above the broken stones 4 in the water pump embedded region; the waterproof cloth is plastic cloth. The water pumping pipe 2 is led out to the outer side of the foundation pit groove (led out from between the basement outer wall and the foundation pit retaining structure in the embodiment) through the water pumping pipe guide groove, and the bottom of the foundation pit is subjected to precipitation through the water pumping pipe. The water pumping pipe guide grooves are filled with broken stone 4 except the space where the water pumping pipe 2 is positioned and are connected with the broken stone 4 in the water pump embedded area; a foundation pit bottom concrete cushion layer is arranged above the waterproof cloth 5 in the water pump embedded area and above the broken stone 4 in the water pumping pipe guide groove; in this embodiment, the top of concrete cushion is raft and basement outer wall, and there is foundation ditch retaining structure the outside. The minimum grain size of the pebbles 3 is not less than 5cm, the average grain size is not less than 8cm, and the maximum grain size is not more than 10cm; the maximum grain size of the broken stone 4 is not more than 30mm, and the minimum grain size is not less than 10mm. (the particle size of the pebbles 3 is related to the permeability coefficient, the larger the particle size is, the larger the permeability coefficient is, the water pump is wrapped in the pebbles, the sufficient water inflow is required when pumping water, the smaller the particle size of the pebbles is, the permeability coefficient is smaller, the water inflow is smaller, the work efficiency of the water pump is not easy to fully exert, the water pump can be damaged after long-term use, the larger particle size of the pebbles also causes larger pores among the pebbles, the external sediment filtering effect is reduced, the muddy sand is easy to enter the water pump to cause the water pump to lose efficacy, the rubble 4 is positioned below the bottom of the cushion layer and directly contacted with the cushion layer, the higher uniformity of particle grading is required, if the particle size is too large, the uniformity is poor, in addition, when the cushion layer is poured with concrete, the larger particle size of the rubble is easy to infiltrate cement slurry, so that the lower pebble wrapping layer is solidified, the water pump cannot pump is caused, and the particle size of the rubble is too small, the rubble easily flows into the lower pebble layer 4, and the filtering effect of the pebble layer 4 is affected.

In the embodiment, the upper opening of the water pump embedded region is square, and the side length d of the upper opening is 1.5 and m; the longitudinal depth h of the water pump embedded region is 1.0m. (the ground soil is disturbed after the water pump embedded region is excavated, broken pebbles can be adopted for filling the disturbed region, when the excavation size is large, the foundation treatment region is large, uneven settlement of the foundation is easy to cause, in addition, the water pump embedded region excavation depth and the bottom opening size after excavation can be used for placing a lower water pump, when the depth and the bottom opening size are particularly abundant, the pebble backfilling amount is easy to increase, and therefore the opening side length and the depth of the embedded region are set to be about 1.5m and 1.0 m), and the longitudinal section of the water pump embedded region is isosceles trapezoid with wide upper part and narrow lower part. The water pumping pipe guide groove is positioned 20cm below the foundation pit concrete cushion layer.

The above examples are only a part of the present utility model and not all the embodiments of the present utility model are covered, and those skilled in the art can obtain more embodiments without any inventive effort on the basis of the above examples and the accompanying drawings, and therefore, all embodiments obtained without any inventive effort are included in the scope of the present utility model.

Claims (6)

1. The utility model provides a foundation ditch tank bottom buries pump precipitation structure which characterized in that: the water pump comprises a water pump embedded area excavated downwards from the bottom of the foundation pit and a water pumping pipe guide groove excavated to one side from the water pump embedded area; the water pump burying area is internally provided with a water pump (1), pebbles (3), broken stones (4) and waterproof cloth (5), and the water suction pipe guide groove is internally provided with a water suction pipe (2) and broken stones (4) of the water pump (1);

the pebble (3) is filled at the lower part of the water pump embedded region, the water pump (1) is obliquely arranged in the region filled with the pebble (3) and is penetrated by the pebble (3) to the top surface, the gravels (4) are filled above the region filled with the pebble (3), and the waterproof cloth (5) is arranged above the gravels (4) in the water pump embedded region;

the water pumping pipe (2) is led out to the outer side of the foundation pit groove through the water pumping pipe guide groove, and broken stone (4) is filled in the water pumping pipe guide groove except the space where the water pumping pipe (2) is located and is connected with the broken stone (4) in the water pump embedded area;

a foundation pit bottom concrete cushion layer is arranged above the waterproof cloth (5) in the water pump embedded area and above the broken stone (4) in the water suction pipe guide groove;

the minimum grain diameter of the pebbles (3) is larger than the maximum grain diameter of the gravels (4); the area of the upper opening of the water pump embedded region is larger than the area of the bottom of the region.

2. The foundation pit bottom embedded pump precipitation structure of claim 1, wherein: the minimum grain diameter of the pebbles (3) is not smaller than 5cm, the average grain diameter is not smaller than 8cm, and the maximum grain diameter is not larger than 10cm; the maximum grain diameter of the broken stone (4) is not more than 30mm, and the minimum grain diameter is not less than 10mm.

3. The foundation pit bottom embedded pump precipitation structure of claim 1, wherein: the upper opening of the water pump embedded region is square, and the side length of the upper opening is 1.4-1.6 m; the longitudinal depth of the water pump embedded area is 0.9-1.1 m.

4. The foundation pit bottom embedded pump precipitation structure of claim 1, wherein: the longitudinal section of the water pump embedded area is an isosceles trapezoid with a wide upper part and a narrow lower part.

5. The foundation pit bottom embedded pump precipitation structure of claim 1, wherein: the water pumping pipe guide groove is located 18-22 cm below the foundation pit concrete cushion layer.

6. The foundation pit bottom embedded pump precipitation structure of claim 1, wherein: the waterproof cloth (5) is plastic cloth.

Images