CN115288173A - A foundation pit drainage system and method - Google Patents

Abstract

The invention relates to the technical field of building construction, and aims to solve the problems of low drainage efficiency, easy sand accumulation and pipe blockage, incapability of continuously reducing water in the concrete pouring process of a raft plate and disordered water seepage of the side wall of a foundation pit in the traditional foundation pit drainage mode; the invention arranges the half-filtering water pipes on the side wall of the foundation pit, the bottom of the foundation pit and the post-cast strip, connects the half-filtering water pipes to the drain pipes, effectively organizes disordered leaking water, performs organized drainage on the bottom of the foundation pit, the side wall of the foundation pit and the post-cast strip, and improves water collection efficiency by using height difference and negative pressure; water is pumped and drained to the sedimentation tank through blind well precipitation, underground water is collected and utilized, and water resources are saved.

Description

A foundation pit drainage system and method

technical field

The invention relates to the technical field of building construction, in particular to a foundation pit drainage system and method.

Background technique

In the foundation pit construction process in areas with abundant groundwater, it is often necessary to dewater the foundation pit during the foundation construction stage. It is most common to set drainage ditches in and around the foundation pit for open drainage. Usually, one or several drainage ditches are excavated at the lower part of the foundation pit in the construction area, and the water is collected in the water collection well through the drainage ditches, and the water pump in the water collection well pumps the water out of the foundation pit to achieve the purpose of dewatering. This kind of precipitation method is likely to cause sediment to deposit in the drainage ditches and water collection wells, block the water pump and the water pump pipeline, and require frequent maintenance; at the same time, the drainage ditches inside the construction area will also affect the earthwork excavation and the construction of the foundation cushion, resulting in precipitation. low efficiency. If the water collection well is set inside the foundation pit due to site constraints, the pumping and drainage pipeline will pass through the cushion, waterproof layer, and foundation raft, and the water cannot be continuously dewatered during the concrete pouring of the raft, which will also affect the quality of the raft pouring .

In addition to the precipitation at the bottom of the foundation pit, the water seepage on the side wall of the foundation pit is often drained out of order. The leakage points are at various points on the side wall of the foundation pit. There is no effective way to organize the drainage. The traditional grouting is only a temporary solution. The root cause is that the water flow on the side wall cannot be dredged, which affects the construction safety of the foundation pit.

Contents of the invention

The present invention aims to provide a foundation pit drainage system and method to solve the problems of low drainage efficiency, easy sand accumulation and pipe blockage, unsustainable dewatering during raft concrete pouring, and disordered water seepage on the side wall of the foundation pit in the traditional foundation pit drainage method. The problem.

The present invention is realized by adopting the following technical solutions:

The invention provides a foundation pit drainage system, which includes semi-filtered water pipes arranged at the side walls of the foundation pit, the bottom of the foundation pit, and the post-pouring belt. The drainage pipe is connected to a negative pressure pump, and the negative pressure pump is placed in a blind well, and the blind well is connected to a sedimentation tank through a pipeline.

In the present invention, semi-filtered water pipes are arranged at the side walls of the foundation pit, the bottom of the foundation pit and the post-pouring belt, and the semi-filtered water pipes are connected to the drainage pipes to effectively organize the disorderly seepage water, and the bottom of the foundation pit, the side walls of the foundation pit and Organized dewatering and drainage at the post-casting zone, and use height difference and negative pressure to improve water collection efficiency, so as to solve the problems of low drainage efficiency, easy sand accumulation and pipe plugging, unsustainable precipitation during raft concrete pouring, foundation Problems such as disorderly water seepage on the side wall of the pit.

The invention pumps and drains the water to the sedimentation tank through the dewatering of the blind well, collects and utilizes the groundwater, and achieves the purpose of saving water resources.

As a preferred technical solution:

The semi-filtered water pipe and the drain pipe are located under the base cushion.

It does not affect the subsequent construction, does not interrupt the drainage during the pouring of the concrete raft, does not damage the waterproof layer, and can greatly improve the drainage efficiency.

As a preferred technical solution:

The semi-filtered water pipes arranged at the bottom of the foundation pit and the post-cast belt are wrapped with crushed stones.

As a preferred technical solution:

A plurality of the semi-filtered water pipes are arranged on the side wall of the foundation pit, and the semi-filtered water pipes are arranged obliquely, and the inclined downward end of the semi-filtered water pipes is connected to a vertical drain pipe, and the vertical drain pipe Connect to main drain.

As a preferred technical solution:

The semi-filtered water pipes on the side wall of the foundation pit are arranged at intervals along the depth direction of the foundation pit.

As a preferred technical solution:

The side wall of the foundation pit and the semi-filtered water pipe at the bottom of the foundation pit are connected to the main drain pipe through a horizontal drain pipe.

As a preferred technical solution:

A water pump is provided in the sedimentation tank.

To facilitate the pumping of groundwater.

As a preferred technical solution:

The negative pressure pump may be a submersible pump.

The present invention further provides a foundation pit drainage method, comprising the following steps:

Step 1: Install semi-filtered water pipes on the side walls of the foundation pit, the bottom of the foundation pit, and the post-pouring belt;

Wrap the semi-filtered water pipe at the bottom of the foundation pit and the post-pouring belt with gravel, and connect it to the main drain through a horizontal drain; set the semi-filtered water pipe on the side wall of the foundation pit obliquely, and connect it to a vertical drain connected to the main drain;

Step 2: Connect the main drainage pipe to a negative pressure pump, place the negative pressure pump in a blind well, and connect the blind well to a sedimentation tank through a pipeline.

Using the above method, using the height difference between the semi-filtered water pipes on the side wall of the foundation pit, the water on the side wall of the foundation pit will be discharged smoothly through the semi-filtered water pipes to the vertical drainage pipes, and then to the main drainage through the vertical drainage pipes In the pipe, the negative pressure effect of the negative pressure pump is more conducive to the water in the horizontal drainage pipe and the vertical drainage pipe entering the blind well, so as to realize the organized and high-efficiency drainage, without affecting the follow-up engineering construction, because the drainage pipeline of the present invention (Semi-filtered water pipes and various drainage pipes) are buried under the foundation cushion, and the drainage is not interrupted when the raft is poured, and the waterproof layer is not damaged, which can greatly improve the drainage efficiency.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

The invention can use the height difference and negative pressure to realize the organized high-efficiency drainage of the foundation pit. The drainage pipeline is buried under the foundation cushion, which does not affect the subsequent construction. The drainage is not interrupted when the raft is poured, and the waterproof layer is not damaged. Greatly improve the drainage efficiency.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a foundation pit drainage system according to the present invention.

Fig. 2 is a schematic plan view of the foundation pit drainage system according to the present invention.

Fig. 3 is a schematic structural view of the semi-filtered water pipe of the present invention.

Fig. 4 is a schematic diagram of the layout of the semi-filtered water pipes on the side wall of the foundation pit according to the present invention.

Icons: 1-semi-filtered water pipe, 2-vertical drainage pipe, 3-horizontal drainage pipe, 4-general drainage pipe, 5-bottom of foundation pit, 6-post-pouring belt, 7-gravel, 8-raft, 9 -Raft reinforcement, 10-waterproof steel plate, 11-L-shaped angle steel, 12-clay, 13-cover plate, 14-negative pressure pump, 15-blind well, 16-sedimentation tank, 17-filter hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention. rather than all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

As shown in Figures 1 and 2, this embodiment proposes a foundation pit drainage system, including a semi-filtered water pipe 1 arranged at the side wall of the foundation pit, the bottom of the foundation pit 5, and the post-pouring belt 6. The semi-filtered water pipe 1 It is connected to a negative pressure pump 14 through a drainage pipe, and the negative pressure pump 14 is placed in a blind well 15, and the blind well 15 is connected to a sedimentation tank 16 through a pipeline, and a suction pump is arranged in the sedimentation tank 16. As shown in FIG. 3 , the upper half of the semi-filtered water pipe 1 is provided with a water filter hole 17 .

In this embodiment, the semi-filtered water pipe 1 and the drainage pipe are located under the foundation cushion, which does not affect the subsequent construction, does not interrupt the drainage, does not damage the waterproof layer, and can greatly improve the drainage efficiency.

In this embodiment, as shown in Figure 2 and Figure 4, a plurality of the semi-filtered water pipes 1 are provided on the side wall of the foundation pit, and the semi-filtered water pipes 1 on the side wall of the foundation pit are arranged along the The depth direction of the foundation pit is arranged uniformly and at intervals, so that the water on the side wall of the foundation pit can be evenly discharged into the semi-filtered water pipe 1 . The semi-filtered water pipe 1 is arranged obliquely, and the inclined downward end of the semi-filtered water pipe 1 is connected to the vertical drain pipe 2, and the vertical drain pipe 2 is connected to the main drain pipe 4, so that the semi-filtered water pipe 1 The water above enters the vertical drainage pipe 2 smoothly, and then is discharged into the main drainage pipe 4 through the vertical drainage pipe 2, and the main drainage pipe 4 is connected with the negative pressure pump 14.

In this embodiment, after the excavation of the foundation pit is completed, trenches are excavated to bury the semi-filtered water pipe 1 and wrapped with gravel 7 at places such as the post-casting zone 6, the bottom of the foundation pit 5, and places with large water inflows. The semi-filtered water pipe 1 on the side wall of the foundation pit and the bottom 5 of the foundation pit is connected to the main drain pipe 4 through a horizontal drain pipe 3 . The horizontal drain pipe 3 is only an example, and the horizontal pipe may not be used.

In this embodiment, the foundation pad includes a concrete raft 8 , and raft steel bars 9 are arranged in the raft 8 . Waterproof steel plates 10 and L-shaped angle steels 11 are provided on both sides of the post-casting belt 6 on the raft 8 , the upper part of the post-casting belt 6 is closed by a cover plate 13 , and the lower part of the post-casting belt 6 is covered by clay 12 For backfilling, the semi-filtered water pipe 1 is located below the clay 12 and wrapped by gravel 7 .

The present invention is provided with a semi-filtered water pipe 1 at the side wall of the foundation pit, the bottom 5 of the foundation pit, and the post-pouring belt 6, and the semi-filtered water pipe 1 is connected to the drain pipe to effectively organize the disorderly seepage water, and the bottom of the foundation pit 5 , the side wall of the foundation pit, and the post-pouring belt to carry out organized drainage and drainage, and use the height difference and negative pressure to improve the water collection efficiency, so as to solve the problems of low drainage efficiency, easy sand accumulation and pipe blockage, and raft concrete pouring in the existing technology During the process, the precipitation cannot be sustained, and the side wall of the foundation pit has disordered water seepage and other problems.

The present invention pumps and drains the water to the sedimentation tank 16 through the dewatering of the blind well 15, collects and utilizes the groundwater, and achieves the purpose of saving water resources.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A foundation pit drainage system, characterized in that: It includes semi-filtered water pipes arranged on the side wall of the foundation pit, the bottom of the foundation pit and the post-casting belt, the upper part of the semi-filtered water pipe is provided with a water filter hole, and the semi-filtered water pipe is connected to a negative pressure pump through a drain pipe. The negative pressure pump is placed in the blind well, which is connected to the sedimentation tank through pipelines. 2. The foundation pit drainage system according to claim 1, characterized in that: The semi-filtered water pipe and the drain pipe are located under the base cushion. 3. The foundation pit drainage system according to claim 1, characterized in that: The semi-filtered water pipes arranged at the bottom of the foundation pit and the post-cast belt are wrapped with crushed stones. 4. The foundation pit drainage system according to claim 1, characterized in that: A plurality of the semi-filtered water pipes are arranged on the side wall of the foundation pit, and the semi-filtered water pipes are arranged obliquely, and the inclined downward end of the semi-filtered water pipes is connected to a vertical drain pipe, and the vertical drain pipe Connect to main drain. 5. The foundation pit drainage system according to claim 4, characterized in that: The semi-filtered water pipes on the side wall of the foundation pit are arranged at intervals along the depth direction of the foundation pit. 6. The foundation pit drainage system according to claim 4, characterized in that: The side wall of the foundation pit and the semi-filtered water pipe at the bottom of the foundation pit are connected to the main drain pipe through a horizontal drain pipe. 7. The foundation pit drainage system according to claim 1, characterized in that: A water pump is provided in the sedimentation tank. 8. A foundation pit drainage method, characterized in that: comprising the following steps: Step 1: Install semi-filtered water pipes on the side walls of the foundation pit, the bottom of the foundation pit, and the post-pouring belt; Wrap the semi-filtered water pipe at the bottom of the foundation pit and the post-pouring belt with gravel, and connect it to the main drain through a horizontal drain; set the semi-filtered water pipe on the side wall of the foundation pit obliquely, and connect it to a vertical drain connected to the main drain; Step 2: Connect the main drainage pipe to a negative pressure pump, place the negative pressure pump in a blind well, and connect the blind well to a sedimentation tank through a pipeline.

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