CN212001008U

CN212001008U - Concrete face dam seepage flow monitoring devices on deep overburden

Info

Publication number: CN212001008U
Application number: CN202020105678.7U
Authority: CN
Inventors: 苗君; 程瑞林; 别玉静
Original assignee: PowerChina Guiyang Engineering Corp Ltd
Current assignee: PowerChina Guiyang Engineering Corp Ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-11-24
Anticipated expiration: 2030-01-17

Abstract

The utility model discloses a concrete panel dam seepage flow monitoring device on a deep covering layer, which comprises a manual drilling hole in the deep covering layer, wherein a PVC pipe I is nested in the manual drilling hole, the bottom of the manual drilling hole is filled with fine sand, an osmometer is placed on the fine sand, and the osmometer is positioned in the PVC pipe I; a PVC pipe II with the diameter larger than that of the PVC pipe I is nested at the top of the PVC pipe I, and a hole cover sealing pipe orifice is arranged at the top of the PVC pipe II. The technical scheme of the utility model implement conveniently, avoid pouring jumbo size cut-off wall, can save the investment, the monitoring effect is showing simultaneously, has stronger use value, better social and economic benefits.

Description

Concrete face dam seepage flow monitoring devices on deep overburden

Technical Field

The utility model relates to a concrete face dam seepage flow monitoring devices on deep overburden belongs to hydraulic and hydroelectric engineering monitoring technology field.

Background

At present, a cutoff wall is generally constructed at the downstream dam foot of a concrete faced dam, a measuring weir is constructed on the cutoff wall to monitor the seepage flow of the concrete faced dam, and the method can intuitively and effectively measure the seepage flow of the dam. Particularly, the monitoring method has obvious effect on the concrete face dam which is filled on a shallow covering layer and has a low tail water level under the condition of certain investment.

However, the monitoring of the seepage of the face dam in the deep overburden layer and the high tail water level is still a difficult problem at present, if the cutoff wall is still built at the downstream dam foot, a large amount of investment is needed firstly, and then the high cutoff wall has a destabilization risk. However, the seepage rate, which is an important index for evaluating the safety of the panel dam, is an indispensable monitoring item. The utility model provides a concrete face board dam seepage flow monitoring devices and method on deep overburden can carry out effective monitoring to deep overburden top panel dam seepage flow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a concrete panel dam seepage flow monitoring devices on deep overburden obtains reliable seepage flow monitoring data to judge whether there is the destruction condition in panel dam seepage prevention system, guarantee the long-term safe operation of concrete panel dam.

The technical scheme of the utility model as follows:

a concrete face dam seepage flow monitoring device on a deep covering layer comprises a manual drilling hole in the deep covering layer, a PVC pipe I is nested in the manual drilling hole, fine sand is filled at the bottom of the manual drilling hole, an osmometer is placed on the fine sand, and the osmometer is positioned in the PVC pipe I; a PVC pipe II with the diameter larger than that of the PVC pipe I is nested at the top of the PVC pipe I, and a hole cover sealing pipe orifice is arranged at the top of the PVC pipe II.

Further, the size of the manual drilling hole is phi 89mm, the size of the PVC pipe is phi 50mm, the PVC pipe is divided into a solid pipe and a flower pipe, the top of the PVC pipe is the solid pipe, the lower part of the PVC pipe is the flower pipe, the aperture of the hole is phi 6mm, and the porosity is 20%.

Further, the second size of the PVC pipe is phi 75mm, the length of the PVC pipe is 1.3m, the length of the PVC pipe nested outside the first size of the PVC pipe is 1m, cotton yarns are wrapped outside the 0.3m length range, and cement mortar is filled outside the 0.7m length range; the length of the extension of the outer wall of the sleeve is 0.3m, and the outer wall of the sleeve is provided with threads.

Furthermore, a concrete cushion seat is arranged around the outlet of the water level hole, and the osmometer cable penetrates out of the concrete cushion seat.

Furthermore, the inner wall of the aperture cover is provided with threads which are screwed with the PVC pipe II.

Compared with the prior art, the utility model: the technical scheme of the utility model implement conveniently, avoid pouring jumbo size cut-off wall, can save the investment, the monitoring effect is showing simultaneously, has stronger use value, better social and economic benefits.

Drawings

FIG. 1 is a detailed view of the seepage monitoring device of the present invention;

fig. 2 is a plan view of an embodiment of the present invention.

The labels in the figures are: 1-osmometer, 2-PVC pipe I, 3-PVC pipe II, 4-manual drilling, 5-fine sand, 6-cotton yarn, 7-cement mortar, 8-hole cover, 9-concrete cushion, 10-osmometer cable and 11-embedding position.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses an implement like this:

the utility model discloses a PVC manages 2, two 3 of PVC pipe, cement mortar 7, fine sand 5, cotton yarn 6, concrete pad 9 and osmometer 1 and forms seepage flow monitoring device, through arranging on the deep overburden in concrete panel dam low reaches, obtains the intraformational water level of deep overburden, promptly the utility model discloses a monitoring devices. The monitoring device is easy to process, simple in structure, convenient and fast to construct and capable of achieving the purpose easily.

The monitoring device has the following implementation mode: (1) firstly, drilling holes in a downstream deep covering layer manually, and drilling holes to be 0.5m below bedrock by adopting a construction mode of drilling holes and sleeving pipes simultaneously. (2) And (3) extending the PVC pipe I2 into the drilled hole, filling fine sand 5 within 0.15m of the bottom of the hole, placing an osmometer 1 on the top of the fine sand 5, and burying the position 11 as shown in figure 1. (3) A PVC pipe II 3 is nested at the top of the PVC pipe I2, and a hole cover 8 is arranged at the top of the pipe to seal the pipe opening. (4) And a concrete cushion seat 9 is arranged around the outlet of the water level hole. The specific structure is shown in figure 1.

The structure type of the monitoring device is described as follows: (1) the size of the manual drilling hole 4 is phi 89 mm. (2) The first 2 size of the PVC pipe is phi 50mm and is divided into a solid pipe and a flower pipe, wherein the top part of the PVC pipe is the solid pipe, the length of the PVC pipe is 2m, the lower part of the PVC pipe is the flower pipe, the aperture of the opening is phi 6mm, and the porosity is 20%. (3) The size of the PVC pipe II 3 is phi 75mm, the length is 1.3m, the length of the PVC pipe II nested outside the PVC pipe I2 is 1m, cotton yarns 6 are wrapped outside the length range of 0.3m, and cement mortar 7 is filled outside the length range of 0.7 m; the length of the extension of the outer wall of the sleeve is 0.3m, and the outer wall of the sleeve is provided with threads. (4) The inner wall of the orifice cover 8 is provided with threads, and the threads are screwed with the second 3 PVC pipes, so that the combination is firm, and sundries are prevented from entering the water level hole. (5) The thickness of the concrete cushion seat 9 around the outlet is 0.05m, and the distance from the hole opening is 0.5 m.

In one embodiment shown in fig. 2, the monitoring method comprises: (1) 3 sections are arranged on the deep covering layer at the downstream of the concrete face dam, namely 3 drainage level holes are arranged, the first row is close to the dam foot, the row spacing is 10m, each row is basically provided with one water level hole at an interval of 10m, and the end part of each section is required to be ensured to be respectively provided with 1 water level hole close to bedrocks at two banks. For example, each section is provided with 3 water level holes, the water level holes of the first section (the first row) are respectively numbered as W1-1, W1-2 and W1-3, the water level holes of the second section (the second row) are respectively numbered as W2-1, W2-2 and W2-3, and the water level holes of the third section (the third row) are respectively numbered as W3-1, W3-2 and W3-3; (2) the water level of each water level hole is obtained through the osmometer 1, and then the water level of each water level hole is weighted and averaged to obtain the average water level of each section. For example, the water level of the water level holes in the first section (first row) is respectively H1-1, H1-2 and H1-3, the water level of the water level holes in the second section (second row) is respectively H2-1, H2-2 and H2-3, and the water level of the water level holes in the third section (third row) is respectively H2-1, H2-2 and H2-3Discharge) water level holes with water levels of H3-1, H3-2 and H3-3 respectively,

(3) calculating the hydraulic gradient i from the first section to the second section according to the calculated average water level of each section₁Hydraulic gradient i from the second section to the third section₂Then calculating the average hydraulic gradient i from the first section to the third section_Average. E.g. hydraulic ramp down from a first section to a second section

Hydraulic gradient from second to third section

Then the average hydraulic gradient from the first section to the third section

If the permeability coefficient of the covering layer is k, the water passing area S of the second section is taken₂For calculating the section, the seepage q of the face dam is kS₂i_Average。

Note that: (1) the water level hole bore must penetrate 0.5m below the bedrock face. (2)

And an orifice cover 8 is required to be arranged outside the PVC pipe II 3. (3) In order to ensure the accuracy of the water level of each water level hole, besides adopting the osmometer 1 to monitor the water level, an electromagnetic water level meter is also needed to be manually adopted to carry out calibration and measurement. (4) The permeability coefficient of the covering layer must be rechecked and confirmed by geological specialties to ensure accuracy, so that the accuracy of seepage calculation is ensured.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a concrete face dam seepage flow monitoring devices on deep overburden which characterized in that: the water level control method comprises the steps of drilling a hole (4) serving as a water level hole in a deep covering layer, nesting a PVC pipe I (2) in the hole (4), filling fine sand (5) at the bottom of the hole (4), placing an osmometer (1) on the fine sand (5), and positioning the osmometer (1) in the PVC pipe I (2); a PVC pipe II (3) with the diameter larger than that of the PVC pipe I (2) is nested at the top of the PVC pipe I (2), and a hole cover (8) is arranged at the top of the PVC pipe II (3) to close the pipe orifice.

2. The apparatus for monitoring seepage of concrete faced dams over deep covering areas of claim 1, wherein: the size of the manual drilling hole (4) is phi 89mm, the size of the PVC pipe I (2) is phi 50mm, the PVC pipe I (2) is divided into a solid pipe and a flower pipe, wherein the top of the PVC pipe I is the solid pipe, the lower part of the PVC pipe I is the flower pipe, the aperture of the hole is phi 6mm, and the porosity is 20%.

3. The apparatus for monitoring seepage of concrete faced dams over deep covering areas of claim 2, wherein: the size of the PVC pipe II (3) is phi 75mm, the length is 1.3m, the length of the PVC pipe II nested outside the PVC pipe I (2) is 1m, cotton yarns (6) are wrapped outside the length range of 0.3m, and cement mortar (7) is filled outside the length range of 0.7 m; the length of the extension of the outer wall of the sleeve is 0.3m, and the outer wall of the sleeve is provided with threads.

4. The apparatus for monitoring seepage of concrete faced dams over deep covering areas of claim 3, wherein: and a concrete cushion seat (9) is arranged around the outlet of the water level hole, and the osmometer cable (10) penetrates out of the concrete cushion seat (9).

5. The apparatus for monitoring seepage of concrete faced dams over deep covering areas of claim 4, wherein: and the inner wall of the aperture cover (8) is provided with threads and is screwed with the PVC pipe II (3).