CN218562253U - Convenient measuring's weir is surveyed to earth and rockfill dam back - Google Patents
Convenient measuring's weir is surveyed to earth and rockfill dam back Download PDFInfo
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- CN218562253U CN218562253U CN202222272645.3U CN202222272645U CN218562253U CN 218562253 U CN218562253 U CN 218562253U CN 202222272645 U CN202222272645 U CN 202222272645U CN 218562253 U CN218562253 U CN 218562253U
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Abstract
The utility model provides a conveniently measured water measuring weir behind an earth and rockfill dam, which comprises a weir groove, a weir plate arranged at a weir crest, a water level observation hole with the aperture not less than 90mm, a water gauge and a trash rack; the water level observation hole is positioned at the highest weir water head which is 3 to 5 times of the distance from the upstream of the weir plate, and the trash rack is vertically arranged at the upstream of the water level observation hole; the water level observation hole body is a pipe body which is arranged in the side wall of the weir groove, the upper end of the water level observation hole body is vertical and extends out of the top surface of the side wall, the lower end of the water level observation hole body is bent, and a water outlet is arranged on the inner wall of the side wall; the water gauge is close to the water inlet of the water level observation hole, and the zero point elevation of the water gauge is flush with the top elevation of the water inlet and the elevation of the weir crest. This technical scheme sets up on the one hand and blocks dirty grid and to the clearance of measuring weir, guarantees that rivers are stable, the observation is steady, and on the other hand adopts the electricity to survey fluviograph or water hammer reading more convenient accurate through water level observation hole, and the water gauge of close neighbour can also play the secondary correction of result effect simultaneously, and the result is more accurate after the comparative analysis.
Description
Technical Field
The utility model belongs to the technical field of the weir, concretely relates to observable weir behind earth and rockfill dam.
Background
The measuring weir is an overflow weir which is arranged in a channel or a water tank and is used for measuring the flow of water flow, most commonly, a thin-wall weir with a special notch is used, and the thin-wall measuring weir can be divided into a triangular weir, a rectangular weir, a trapezoidal weir and the like according to the shape of the notch. In reality, because seepage flow behind the earth and rockfill dam is great, set up cut-off wall behind the dam and adopt the weir to observe usually, the weir type of weir is generally rectangle weir or trapezoidal weir. In actual observation, the reliability of the seepage flow rate value is influenced by various factors. Firstly, a water measuring weir behind an earth and rockfill dam is generally positioned in the field, the range of a water collecting area is large, plants around the water measuring weir are flourishing, floating objects are easy to accumulate on a weir trough and a weir plate, a weir head is blocked up, measured values are distorted, and the water collecting area behind the earth and rockfill dam is generally inconvenient to traffic and difficult to ensure to clean in time; secondly, the manual survey water gauge is installed at the weir groove side wall, needs the head of bowing reading downwards, and the level is hardly guaranteed to the sight, and the water gauge reading has certain deviation in addition to the water current fluctuation in the weir groove.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, the measuring weir structure is convenient to observe the height of the water head of the upper weir of the measuring weir behind the field earth and rockfill dam so as to accurately analyze the seepage flow of the earth and rockfill dam.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a conveniently-measured water measuring weir behind an earth and rockfill dam comprises a weir groove, a weir plate arranged at a weir crest, a water level observation hole with the aperture not smaller than 90mm, a water gauge and a trash rack; the water level observation hole is positioned at the highest weir water head which is 3 to 5 times of the upstream of the weir plate, and the trash rack is vertically arranged at the upstream of the water level observation hole; the water level observation hole body is a pipe body which is arranged in the side wall of the weir notch, the upper end of the water level observation hole body is vertical and extends out of the top surface of the side wall, the lower end of the water level observation hole body is bent, and the water outlet is arranged on the inner wall of the side wall; the water gauge is close to the water inlet of the water level observation hole, and the zero elevation of the water gauge is flush with the top elevation of the water inlet and the elevation of the weir crest.
Furthermore, a cross rod is arranged on the top edge of the trash rack, and two ends of the cross rod extend out of the trash rack and are embedded into grooves formed in the tops of the inner walls of two sides of the weir groove.
Further, the trash rack is located more than 5 times the highest weir crest upstream from the weir plate and the distance is not less than 1.5m.
Furthermore, a protective cover is arranged at the upper end of the water level observation hole.
Furthermore, the lower end of the water level observation hole body is horizontal and is connected with the vertical upper end through a bent pipe.
Further, the hole body of the water level observation hole is 1m higher than the top surface of the side wall of the weir trough.
The utility model has the advantages that: (1) The trash blocking and flow stabilizing grating is arranged at the upstream of the weir plate of the measuring weir behind the earth and rockfill dam, so that floating objects can be effectively blocked, and the floating objects are cleaned along the belt during daily inspection tour of the dam, so that the floating objects are prevented from being accumulated; meanwhile, the trash blocking and flow stabilizing grating can play a role in stabilizing water flow, the fluctuation of the bottom water flow in the water measuring weir is smaller than that of the upper water flow, the water level in the water level observation hole can be ensured to be stable, and the accuracy of measuring and reading the water head on the weir is further improved; (2) The water level observation hole and the weir groove form a communicating vessel, the water level of the water level observation hole is measured and read by adopting an electric water level meter or a water hammer, and the water level is converted into a weir water head, so that the water level measuring and reading ruler is more convenient and accurate compared with a traditional manual water measuring and reading ruler; (3) The water gauge is adjacent to the water inlet of the water level observation hole, and the water gauge is arranged in a flush mode in terms of elevation, so that the water gauge reading and the water level observation hole reading can be compared, and the reliability of the result is further ensured.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a front view of the present invention.
Fig. 4 isbase:Sub>A sectional view of the utility model taken along linebase:Sub>A-base:Sub>A.
Fig. 5 is a B-B sectional view of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present embodiment includes a weir plate 1, weir trough side walls 2, a weir trough bottom plate 3, water level observation holes 4, a water gauge 5, and a dirt-blocking and flow-stabilizing grid 6. As shown in fig. 4 to 5, the water level observation hole 4 comprises a water inlet 4-1, a hole body 4-2 and a protective cover 4-3; the trash-blocking and flow-stabilizing grating 6 comprises a cross bar 6-1 and grating holes 6-2.
The water level observation hole 4 is arranged at the highest weir head 3-5 times of the upstream of the weir plate 1 of the water measuring weir, the water inlet 4-1 is a round hole and is arranged on the side wall 2 of the weir trough, and the top of the round hole is flush with the elevation of the weir crest. The water level observation hole 4 comprises a horizontal section and a vertical section, and the horizontal section is connected with the vertical section through a bent pipe. The hole body 4-2 is a PVC pipe with the hole diameter not less than 90mm, so that an electric water level gauge or a water hammer can be conveniently placed. The upper end of the hole body 4-2 is higher than the top of the side wall of the weir trough by about 1m so as to facilitate observation. The top of the upper end of the water level observation hole 4 is provided with a protective cover 4-3 which can prevent foreign matters from falling into and blocking the hole body 4-2, and the protective cover is taken down and covered after observation during each observation.
The water gauge 5 is a steel gauge, is arranged on the weir trough side wall 2 and is close to the water inlet 4-1 of the water level observation hole 4. The zero point elevation of the water gauge is flush with the water inlet top elevation and the weir crest elevation, and the water gauge is mainly used for carrying out contrastive analysis on the measured value of the water level observation hole, so that the result is accurate.
The trash holding steady flow grating 6 is vertically arranged at the position of a 5-time highest weir water head on the upper stream of the weir plate 1 and not less than 1.5m, and the height and the width of the trash holding steady flow grating 6 are matched with the weir groove. The top of the trash blocking and flow stabilizing grid 6 is provided with a cross rod 6-1, grid holes 6-2 are uniformly arranged on the surface of the trash blocking and flow stabilizing grid, and the cross rod 6-1 is placed in a groove reserved at the top of the weir trough side wall 2, so that the trash blocking and flow stabilizing grid can be conveniently installed and lifted, and floaters attached to the grid holes 6-2 can be conveniently cleaned.
The observation operation method of the measuring weir of the embodiment is as follows: before the weir groove is filled with water, obtaining the initial height difference H between the top of the water level observation hole and the top elevation of the water inlet (namely the weir crest elevation) 0 The reading is accurate to 1mm (the same below); after the weir groove is filled with water, adopting an electric measuring fluviograph to measure the height difference H between the top of the water level observation hole and the water surface elevation i ；H 0 And H i The difference value is the water head on the weir, and simultaneously the difference value can be read with a water gauge i Comparing and analyzing the accuracy of the manual measured value of the weir water head; and calculating the seepage flow behind the earth and rockfill dam by adopting a corresponding flow formula according to the type of the weir plate of the measuring weir.
It should be noted that the above describes example embodiments of the invention. However, it should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, which are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the scope of the present invention, and the changes and modifications are intended to fall within the scope of the present invention as claimed.
Claims (6)
1. A conveniently-measured water measuring weir behind an earth and rockfill dam comprises a weir groove and a weir plate arranged at a weir crest, and is characterized by further comprising a water level observation hole with the aperture not smaller than 90mm, a water gauge and a trash rack; the water level observation hole is positioned at the highest weir water head which is 3 to 5 times of the upstream of the weir plate, and the trash rack is vertically arranged at the upstream of the water level observation hole; the water level observation hole body is a pipe body arranged in the side wall of the weir groove, the upper end of the water level observation hole body is vertical and extends out of the top surface of the side wall, the lower end of the water level observation hole body is bent, and the water outlet is arranged on the inner wall of the side wall; the water gauge is close to the water inlet of the water level observation hole, and the zero elevation of the water gauge is flush with the top elevation of the water inlet and the elevation of the weir crest.
2. The conveniently-measured water measuring weir behind an earth and rockfill dam as claimed in claim 1, wherein the top of the trash rack is provided with a cross bar along the edge, and two ends of the cross bar extend out of the trash rack and are embedded into the grooves formed on the tops of the inner walls at two sides of the weir trough.
3. A conveniently measurable earth and rockfill dam back weir according to claim 1 or claim 2, wherein said trash rack is located more than 5 times the maximum weir head upstream of said weir plate and this distance is no less than 1.5m.
4. The weir of claim 3, wherein the water level observation hole is provided with a protective cover at its upper end.
5. The weir of claim 4, wherein the lower end of the body of the water level observation hole is horizontal and is connected to the upper vertical end by a bent pipe.
6. The conveniently measurable back weir according to claim 4 wherein said water level observation holes are 1m higher than the top surface of said weir trough side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222272645.3U CN218562253U (en) | 2022-08-26 | 2022-08-26 | Convenient measuring's weir is surveyed to earth and rockfill dam back |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222272645.3U CN218562253U (en) | 2022-08-26 | 2022-08-26 | Convenient measuring's weir is surveyed to earth and rockfill dam back |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218562253U true CN218562253U (en) | 2023-03-03 |
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ID=85309497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222272645.3U Active CN218562253U (en) | 2022-08-26 | 2022-08-26 | Convenient measuring's weir is surveyed to earth and rockfill dam back |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218562253U (en) |
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2022
- 2022-08-26 CN CN202222272645.3U patent/CN218562253U/en active Active
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