CN205839779U - A kind of sandy soil stratum base pit dewatering water level following catch pit structure - Google Patents

Abstract

This utility model relates to technical field of building construction, particularly to a kind of sandy soil stratum base pit dewatering water level following catch pit structure.This sandy soil stratum base pit dewatering water level following catch pit structure includes dewatering well, water pump is set in dewatering well, pump intake peripheral hardware outsourcing filter screen, set top in dewatering well pass dewatering well top outer and be embedded in the rigid plastics water pipe that below ground is arranged, dewatering well top also sets rigid plastics permeability cell, fills rubble in dewatering well；Dewatering well peripheral hardware pit, sets blinding layer in pit, elevate above the soil above and cover above dewatering well well head in blinding layer top, and water layer of setting up defences above blinding layer sets sole plate above waterproof layer, and sole plate is cast into catch pit above pit.This sandy soil stratum base pit dewatering water level following catch pit structure ensure that waterproof slab globality, it is to avoid because the sole plate of the imperfect or destroyed generation of waterproof layer leaks, solve very well because of can not shunt in a well and can not when appropriate between the problem of shut-in well.

Description

A sump structure below the precipitation water level of foundation pit in sandy soil stratum

(1) Technical field

The utility model relates to the technical field of building construction, in particular to a sump structure below the precipitation water level of a foundation pit in a sandy soil layer.

(2) Background technology

If no measures are taken to excavate the sump pit below the dewatering water level of the foundation pit in sandy soil stratum, the side wall of the foundation pit will collapse seriously due to the seepage of side wall water and the upwelling of bottom water, making it impossible to excavate; the existing technology is generally Take the second-level well point dewatering method to lower the water level to the required elevation, then excavate → make a cushion layer → do waterproofing → waterproof and seal the well (or directly pour the bottom plate concrete to death without sealing the well) → tie steel bars → pour concrete. Seal the well before pouring concrete or fill the well directly with concrete pouring. If the well is closed, the waterproof layer will be damaged by floating, leaving serious hidden dangers to the waterproofing of the basement floor; if the well is not sealed, the hidden danger of waterproofing will be even greater.

(3) Contents of the invention

In order to make up for the deficiencies of the prior art, the utility model provides a sump structure below the precipitation water level of the foundation pit in sandy soil stratum. On-site construction does not need to consider the problem of closing the well in the later stage, which ensures the integrity of the waterproofing of the bottom plate and avoids The hidden danger of water leakage of the foundation floor caused by incomplete or damaged layers has well solved the problems of not being able to seal the well and not being able to seal the well at a suitable time, and solved the problems existing in the prior art.

The utility model is achieved through the following technical solutions:

A sump structure below the dewatering water level of a foundation pit on sandy ground, including a dewatering well, a water pump is provided at the bottom inside the dewatering well, an outsourcing filter is provided outside the water inlet of the water pump, and a bottom end and The hard plastic water pipe connected to the suction port of the water pump. The top of the hard plastic water pipe passes through the outside of the top of the dewatering well and is buried below the ground. A bottom end is provided on the top of the dewatering well below the hard plastic water pipe to communicate with the dewatering well. The rigid plastic air pipe is filled with gravel in the hard plastic water pipe and the precipitation well outside the hard plastic air pipe; a pit is arranged below the ground outside the precipitation well, and a foundation cushion is laid on the inner wall of the pit. The top of the cushion layer protrudes above the ground and is covered above the wellhead of the dewatering well. A waterproof layer is provided above the base cushion layer, and a base plate is provided above the waterproof layer. The base plate is cast above the pit to form a sump.

The foundation cushion is a concrete foundation cushion, and the foundation bottom plate is a concrete foundation bottom plate.

The number of the dewatering wells is greater than or equal to one, and each dewatering well is respectively arranged below the ground below the foundation cushion.

The beneficial effects of the utility model are: the sump structure below the foundation pit precipitation water level of the sandy soil stratum has the following advantages: 1. All survive before the construction of the waterproof layer, reducing the multiple interspersed construction of multiple processes; Water leakage hazard. 2. The principle is simple, the operation is convenient, there is no quality risk, the raw materials are easy to obtain, and the cost is low. 3. Good water control effect. The sump structure below the dewatering water level of the foundation pit in the sandy soil stratum, because the foundation cushion is set above the dewatering wellhead and cast with concrete, it solves the problem that the well cannot be closed and the well cannot be closed at a suitable time, so that the site The construction does not need to consider the problem of closing the well in the later stage, which ensures the integrity of the waterproofing of the bottom plate and avoids the hidden danger of water leakage of the foundation bottom plate caused by incomplete or damaged waterproof layer. The water inlet of the water pump is prevented from being blocked during water pumping by wrapping an outsourcing filter screen outside the water inlet of the water pump.

(4) Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is the structural representation of the utility model.

In the figure, 1 is a dewatering well, 2 is a water pump, 3 is a hard plastic water pipe, 4 is a hard plastic ventilation pipe, 5 is gravel, 6 is a foundation cushion, 7 is a waterproof layer, 8 is a foundation floor, 9 is a sump, and 10 is a cable.

(5) Specific implementation methods

In order to clearly illustrate the technical features of this solution, the utility model will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

As shown in accompanying drawing 1, the sump structure below the dewatering water level of the foundation pit of the sandy soil layer comprises a dewatering well 1, and a water pump 2 is provided at the bottom of the dewatering well 1 inside, and an outsourcing filter is wrapped outside the water inlet of the water pump 2, In the dewatering well 1, a hard plastic water pipe 3 whose bottom end is connected to the suction port of the water pump 2 is provided. The top of the precipitation well 1 below is provided with a hard plastic ventilation pipe 4 whose bottom end communicates with the precipitation well 1, and gravel 5 is filled in the precipitation well 1 outside the hard plastic water pipe 3 and the outer 4 parts of the hard plastic ventilation pipe; Below the ground outside the dewatering well 1, a pit is provided, and a base cushion 6 is laid on the inside wall of the pit. A waterproof layer 7 is arranged above, and a foundation base plate 8 is arranged above the waterproof layer 7, and the base base plate 8 is casted above the pit to form a sump 9.

The foundation cushion 6 is a concrete foundation cushion, and the foundation bottom plate 8 is a concrete foundation bottom plate.

The number of the dewatering wells 1 is greater than or equal to one, and each dewatering well 1 is respectively arranged below the ground below the foundation cushion 6 .

Specific construction process:

Before the excavation of the sump pit, the dewatering well 1 is built on the four sides of the sump (the depth is calculated according to the depth and plane size of the sump), and the water pump 2 (submersible pump) is placed in the dewatering well 1 to extract groundwater. The formation of the well 1 dewatering funnel successfully intercepted the inflow of groundwater on the outside and drained the groundwater on the inside at the same time; after the water level reached the draining level, the pit (sand foundation pit) was excavated, and the follow-up could be carried out after the excavation was completed. Each sub-construction of the foundation base plate 8 concrete pouring is finished and presents strength after the foundation base plate 8 outer edges cut off the hard plastic water pipe 3, the cable 10 of the water pump 2 and the hard plastic vent pipe 4.

The dewatering well 1 of the sump structure below the foundation pit dewatering water level of this sandy soil stratum can hit a plurality of according to stratum situation.

In order to enhance the well sealing effect, the concrete for the foundation cushion at the wellhead of the dewatering well 1 can adopt micro-expansion concrete.

In order to prevent the water inlet of the water pump 2 from being blocked, it is necessary to ensure that the pore size of the outsourcing filter screen is as dense as possible to achieve a good blocking function.

The key points of the construction of the sump structure below the water level of the foundation pit in the sandy soil layer are to fill the well, bury the pipe and seal the well before the waterproof construction: 1. Fill the well: (1) before the water pump 2 is lowered, the water pump 2 water inlet The site is tightly wrapped with barbed wire (filtering effect); (2) Before waterproofing construction (to prevent premature backfilling, if the water pump fails to repair and replace) backfill the dewatering well with gravel (crushed stone has both filling capacity and permeable filtration sex). 2. The hard plastic water pipe 3, the cable 10 and the hard plastic air pipe 4 are buried in the soil layer under the foundation cushion 6. 3. Seal the wellhead of the dewatering well 1 with the micro-expansion concrete of one mark higher than the base cushion 6. 4. Waterproof layer construction.

The parts of the utility model that are not described in detail are the known techniques of those skilled in the art. Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (3)

1. a sandy soil stratum base pit dewatering water level following catch pit structure, is characterized in that: include dewatering well, inside dewatering well Bottom be provided with a water pump, outside the water inlet of water pump, bag sets outsourcing filter screen, is provided with a bottom and water pump in dewatering well The rigid plastics water pipe that pump mouth is connected, the top of rigid plastics water pipe passes dewatering well top outer and is embedded in below ground Arranging, it is ventilative that the dewatering well top below rigid plastics water pipe is provided with the bottom rigid plastics arranged that is connected with dewatering well Pipe, fills rubble in the dewatering well outside rigid plastics water pipe and rigid plastics permeability cell；On the ground outside dewatering well with Having pit, lay blinding layer on pit medial wall, elevates above the soil above and covers in precipitation in the top of blinding layer Above well well head, being arranged over waterproof layer at blinding layer, be arranged over sole plate at waterproof layer, described sole plate is in hole Above groove, casting forms catch pit.

A kind of sandy soil stratum base pit dewatering water level following catch pit structure the most according to claim 1, is characterized in that: described Blinding layer is concrete foundation bed course, and described sole plate is concrete foundation base plate.

A kind of sandy soil stratum base pit dewatering water level following catch pit structure the most according to claim 1, is characterized in that: described The quantity of dewatering well is more than or equal to 1, and each dewatering well is respectively arranged on the below ground below blinding layer.