CN111042217A

CN111042217A - Method for detecting leakage of pile body or underground continuous wall

Info

Publication number: CN111042217A
Application number: CN201911142305.5A
Authority: CN
Inventors: 林威; 代莹
Original assignee: Tianjin Jianyan Rock And Soil Engineering Co ltd
Current assignee: Tianjin Jianyan Rock And Soil Engineering Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-04-21

Abstract

The invention relates to the technical field of leakage detection devices, in particular to a method for detecting leakage of a pile body or an underground diaphragm wall, which comprises the following steps: firstly, respectively drilling an inner water level observation well and an outer water level observation well on the inner side of an underground continuous wall or a waterproof curtain and at a position for measuring connection; secondly, respectively loading the pipe into an inner water level observation well and an outer water level observation well, wherein the middle part and the lower part of the pipe in the outer water level observation well are provided with through holes, the upper part of the pipe is not provided with the through holes, a rubber plug is plugged into the part without the through holes, a high-pressure water pipe penetrates through the rubber plug and introduces high-pressure water with colors into the pipe, and the clay between two piles or at the joint of the underground continuous wall is forcibly flushed; and thirdly, judging the leakage position by observing whether the inner water level observation well has color or not. The method can accurately judge the position of the missing point and effectively improve the accuracy of measurement.

Description

Method for detecting leakage of pile body or underground continuous wall

Technical Field

The invention relates to the technical field of leakage detection devices, in particular to a method for detecting leakage of a pile body or an underground diaphragm wall.

Background

Because the land price is more and more expensive, the full utilization of underground space has become a trend of urban building development, and the excavation and supporting of deep foundation pit are widely used in high-rise buildings, subways and other projects. In response to the problem of underground water treatment, the fully-closed water stopping of a deep stirring pile or a waterproof curtain of a pile in an underground diaphragm wall or a construction method is combined with drainage stopping of a dewatering well by combining the deep stirring pile and the curtain. Due to the limitation of conditions such as construction machines, surrounding environment, geological hydrology and the like, the waterproof curtain cannot be completely overlapped and occluded, so that the current situation of 'nine holes in ten pits' of the foundation pit in the sandy soil area is difficult to be radically improved. Especially in the excavation process of a foundation pit, a leakage point can be seen often, but a leakage channel and a water inlet point are difficult to find, and due to the earth excavation, the implementation of a plurality of treatment processes is limited, so that the fundamental problem cannot be solved easily due to high cost. The need for how to quickly and accurately find the missing point and deal with the missing point in a targeted manner is more and more urgent. Although some detection modes can detect leakage points at present, the geological environment of clay cannot be detected immediately, the clay can be stuck at the joint of two piles or underground continuous walls, whether water leaks inside and outside cannot be detected through the existing method, only when the piles or the underground continuous walls leak out, the clay is flushed by water on the outer side, and the leakage can be known, and the effects of advanced prediction and advanced treatment cannot be achieved at this time.

Disclosure of Invention

The invention aims to overcome the defects of the technology and provide a method for detecting leakage of a pile body or an underground continuous wall.

In order to achieve the purpose, the invention adopts the following technical scheme: a method for detecting leakage of a pile body or an underground continuous wall is characterized in that: the method comprises the following steps: firstly, drilling an inner water level observation well at the inner side connecting position of an underground continuous wall or a waterproof curtain, and drilling an outer water level observation well at the outer side connecting position of the underground continuous wall or the waterproof curtain;

step two, respectively loading the pipe into an inner water level observation well and an outer water level observation well, wherein the pipe in the inner water level observation well is provided with a through hole, the middle part and the lower part of the pipe in the outer water level observation well are provided with through holes, the upper part of the pipe is not provided with the through holes, a rubber plug is plugged into the part without the through holes, and a high-pressure water pipe penetrates through the rubber plug to introduce high-pressure water with colors into the pipe, so that clay at the joint between two piles or an underground continuous wall is forcibly flushed away;

and step three, judging the leakage position by observing whether the inner water level observation well has color or not.

Preferably, in the second step, a bottom plate with the outer diameter matched with the inner diameter of the pipe is firstly put into the upper part of the pipe in the outer water level observation well, screws are distributed on the bottom plate, a rubber plug with the same diameter as the pipe is put into the bottom plate, the screws penetrate through the rubber plug, finally the top plate is buckled on the upper part of the rubber plug, the screws penetrate through the top plate, the nuts are screwed, and the rubber plug is extruded by the top plate and the bottom plate to be sealed on the upper part of the pipe.

Compared with the prior art, the device has the advantages that the structure of the water level observation well in the prior art is changed by utilizing the prior art, the upper part of the outer water level observation well is sealed according to the condition of clay, the clay between the joints of the piles or the underground continuous wall is flushed away in a mode of injecting high-pressure color water into the outer water level observation well, and the leakage point position can be accurately judged by measuring through the prior equipment due to the fact that the pressurized water is colored, and the measuring accuracy is effectively improved.

Drawings

FIG. 1 is a top view of the present invention;

FIG. 2 is a side view of an external water level observation well according to the present invention.

Detailed Description

The following detailed description of the preferred embodiments will be made with reference to the accompanying drawings. As shown in fig. 1, a method for detecting leakage of a pile body or an underground continuous wall is characterized in that: the method comprises the following steps: firstly, drilling an inner water level observation well 2 at the inner side connecting position of an underground continuous wall or a waterproof curtain 1, and drilling an outer water level observation well 3 at the outer side connecting position of the underground continuous wall or the waterproof curtain;

step two, respectively loading the pipes into an inner water level observation well and an outer water level observation well, wherein the pipes in the inner water level observation well are provided with through holes, the middle part and the lower part of the pipes in the outer water level observation well are provided with through holes 4, the upper part of the pipes is not provided with through holes, the parts without the through holes are plugged into a rubber plug 5, a high-pressure water pipe 6 penetrates through the rubber plug to introduce high-pressure water with colors into the pipes, and the clay between two piles or at the joint of the underground continuous wall is forcibly flushed away;

As shown in fig. 2, in the second step, a bottom plate 7 with the outer diameter matched with the inner diameter of the pipe is firstly put on the upper part of the pipe in the outer water level observation well, screw rods 8 are distributed on the bottom plate, a rubber plug with the same diameter as the pipe is put on the bottom plate, the screw rods penetrate through the rubber plug, finally a top plate 9 is buckled on the upper part of the rubber plug, the screw rods penetrate through the top plate, nuts are screwed on, the rubber plug is extruded by the top plate and the bottom plate, and the rubber plug is sealed on the upper part of the. The method is a method adopted aiming at geological environments with clay, the applicant applies a prediction method of sandy soil environment before the invention, and in practical application, the inventor finds that the clay environment still exists, so that the method is designed according to the existing method.

The device utilizes the prior art, changes the structure of the water level observation well in the prior art, seals the upper part of the outer water level observation well aiming at the condition of clay, flushes away the clay between the joints of the piles or the underground continuous walls in a mode of injecting high-pressure color water into the outer water level observation well, and can accurately judge the position of a leak source by measuring through the existing equipment due to the color of the pressurized water, thereby effectively improving the accuracy of measurement.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method for detecting leakage of a pile body or an underground continuous wall is characterized in that: the method comprises the following steps:

firstly, drilling an inner water level observation well at the inner side connecting position of an underground continuous wall or a waterproof curtain, and drilling an outer water level observation well at the outer side connecting position of the underground continuous wall or the waterproof curtain;

2. The method of detecting leakage from a pile body or underground diaphragm wall of claim 1, wherein: in the second step, a bottom plate with the outer diameter matched with the inner diameter of the pipe is firstly put into the upper part of the pipe in the outer water level observation well, screw rods are distributed on the bottom plate, a rubber plug with the diameter identical to that of the pipe is put into the bottom plate, the screw rods penetrate through the rubber plug, finally the top plate is buckled on the upper part of the rubber plug, the screw rods penetrate through the top plate, the nut is screwed on, and the rubber plug is extruded by the top plate and the bottom plate to be sealed on the upper part of the pipe.