CN108824376B - construction method of duplex rectangular flow weir - Google Patents
construction method of duplex rectangular flow weir Download PDFInfo
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- CN108824376B CN108824376B CN201810556706.4A CN201810556706A CN108824376B CN 108824376 B CN108824376 B CN 108824376B CN 201810556706 A CN201810556706 A CN 201810556706A CN 108824376 B CN108824376 B CN 108824376B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a construction method of a duplex rectangular flow weir, which is suitable for construction in rivers, streams and ditches in mountain areas; constructing a left weir body and a compound rectangular weir crest part, and guiding the water flow direction to drain on the left side of the riverbed by adopting a wood board and a water-proof film; after the construction of the left weir body and the compound rectangular weir crest is completed, the wood board and the water-resisting film are adopted to lead the water flow direction to drain the right side of the riverbed, and the right weir body is constructed; the construction method has the advantages that the reinforced concrete structure is adopted as a foundation, local materials are used, the river pebble mixed cement mortar is adopted as a weir body, the construction method is small in engineering quantity and low in cost, the firmness and the sealing performance of the weir body are improved, a large amount of labor cost can be saved, the local environment is not influenced, the construction method is suitable for being widely applied to construction work of the hydrological monitoring flow weir in the mountain tunnel area, and the market value is high.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering flow weir construction, in particular to a construction method of a duplex rectangular flow weir suitable for flow measurement of river water, stream water and ditch water in mountainous areas.
Background
In recent years, with the rapid development of tunnel engineering construction of mountain high-speed railways and highways, in order to prevent major water inrush accidents in the tunnel engineering construction process, long-term real-time high-precision hydrological monitoring of underground water and surface water in small watershed of mountain areas where tunnels pass through is particularly important. The method for constructing the water weir in the ditches, streams, rivers and the like in the wild mountainous area is complex, and the constructed water weir is inconvenient for monitoring the process of the dynamic change of the water flow in real time for a long time, particularly the process of the large dynamic change of the water flow under different rainfall conditions.
Disclosure of Invention
in view of this, the embodiment of the invention provides a construction method of a compound rectangular flow weir, which can monitor the river flow and the dynamic change process thereof in a mountain area under the condition of complex terrain with high precision.
the embodiment of the invention provides a construction method of a compound rectangular flow weir, which comprises the following steps:
(1) Dividing the weir body into three parts including a left weir body, a compound rectangular weir crest and a right weir body, placing a wood board in the riverbed, paving a flexible drainage water-stop film on the wood board to guide water flow to the right side of the riverbed, and sealing the connection part of the water-stop film and the riverbed;
(2) constructing a left weir body after the left side of the riverbed is dried, wherein the base of the left weir body is of a reinforced concrete structure and is constructed on the bedrock of the riverbed, and the weir body is formed by pouring riverbed pebble mixed cement mortar;
(3) A compound rectangular weir crest is constructed next to the left weir body, the compound rectangular weir crest comprises two layers, namely a first layer of thin-wall weir crest and a second layer of bricklaying weir crest from bottom to top; the base of the compound rectangular weir crest is of a reinforced concrete structure and is built on riverbed bedrock;
(4) after the left weir body and the compound rectangular weir crest are dried, digging a water level monitoring device hole for fixing a water level monitoring device at the upstream of the water flow close to the compound rectangular weir crest, then placing the wood board at the right side of the riverbed and the flexible drainage water-stop film laid on the wood board at the right side of the riverbed at the left side of the riverbed, guiding the water flow to the left side of the riverbed, and sealing the connection part of the water-stop film and the riverbed;
(5) constructing a right weir body after the right side of the riverbed is dried, wherein the base of the right weir body is of a reinforced concrete structure and is constructed on a brook bedrock, and the weir body is formed by pouring riverbed pebble mixed cement mortar;
(6) And after the right weir body is dried and solidified, taking out the wood board and the water-resisting film.
Preferably, the width and the maximum crest height of the first layer of thin-wall weir crest and the second layer of thin-wall weir crest of the weir body are measured, the upper limit height of a small weir corresponding to the first layer of thin-wall weir crest and the upper limit height of a large weir corresponding to the second layer of bricklaying weir crest are measured.
preferably, the first layer of thin-walled weir crest is constructed by adopting a stainless steel plate.
Preferably, when the foundations of the left weir body, the compound rectangular weir crest and the right weir body are constructed, reinforcing steel bars and templates are drilled and arranged on the bed bedrock, and the stainless steel plate is installed at the first layer of thin-wall weir crest for concrete bottom building; and (5) removing the template after the concrete is solidified.
Preferably, a stainless steel pipe is embedded in the hole of the water level monitoring device, small holes are uniformly formed in the pipe body of the stainless steel pipe, and the water level monitoring device is installed in the stainless steel pipe.
The embodiment of the invention also provides a compound rectangular flow weir built by the construction method, which comprises a left weir body, a right weir body, a substrate and a water level monitoring device hole; the left weir body, the right weir body and the substrate form a compound rectangular weir crest, and the compound rectangular weir crest comprises a first layer of thin-wall weir crest and a second layer of bricklaying weir crest; the water level monitoring device hole is positioned at the upstream of the duplex rectangular weir crest and is used for fixing a water level monitoring device.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the construction method of the duplex rectangular flow weir has the advantages that the engineering quantity is small, the cost is low, the main weir body part of the main weir body can be built by using the river-pebble mixed cement mortar as local materials in the construction process, the firmness and the sealing property of the weir body are improved, and a large amount of labor cost can be saved; the method has no influence on the local environment, is suitable for being widely applied to the construction work of the hydraulic monitoring flow weir in the tunnel region of the mountainous area, and has great market value.
Drawings
FIG. 1 is a schematic view of a flow weir configuration according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for applying a flow weir in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a construction method according to an embodiment of the present invention.
Wherein: the water level monitoring device comprises a left weir body 1, a compound rectangular weir crest 2, a first layer of thin-wall weir crest 21, a second layer of brick-built weir crest 22, a stainless steel plate 23, a right weir body 3, a riverbed 4, a wood plate 5, a water-resisting film 6, a substrate 7, a water level monitoring device hole 8, a stainless steel pipe 9, a small hole 91 and a water level monitoring device 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a compound rectangular flow weir, which includes a left weir 1, a right weir 3, a base 7, and a water level monitoring device hole 8; the left weir body 1 and the right weir body 3 are of symmetrical structures, and the left weir body 1 comprises a rectangular structure close to a river bank and a stepped rectangular structure; the left weir body 1, the right weir body 2 and the substrate 7 form a compound rectangular weir crest 3, and the compound rectangular weir crest 3 comprises a first layer of thin-wall weir crest 21 and a second layer of bricklaying weir crest 22; the water level monitoring device hole 8 is positioned at the upstream of the double rectangular weir crest 3 and is used for fixing a water level monitoring device 10.
Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a method for constructing the compound rectangular flow weir, including the following steps:
(1) Dividing a weir body into three parts, namely a left weir body 1, a compound rectangular weir crest 2 and a right weir body 3, placing a wood board 5 on the right side of a river bed 4, laying a flexible drainage water-stop film 6 on the wood board 5 to guide water flow to the right side of the river bed 4, and sealing the connection part of the water-stop film 6 and the river bed 4; the flexible drainage water-stop film 6 is laid on the wood board 5, so that water can be prevented from permeating from the wood board 5 to the left side of the riverbed 4, the left side of the riverbed 4 is ensured to be in a water-free state, and the flexible drainage water-stop film 6 can move along with the direction of water flow, so that the smoothness of the water flow is ensured;
(2) After the left side of the riverbed 4 is dried, a left weir body 1 is built, the base of the left weir body 1 is of a reinforced concrete structure and is built on bedrock of the riverbed 4, and a weir body is formed by pouring riverbed pebble mixed cement mortar; the stability of the weir body is ensured by the base of the concrete structure, the weir body is obtained locally and is mixed and poured by using riverbed pebbles and cement mortar, and the material cost is saved;
(3) A compound rectangular weir crest 2 is constructed next to the left weir body 1, the compound rectangular weir crest 2 comprises two layers, namely a first layer of thin-wall weir crest 21 and a second layer of bricklaying weir crest 22 from bottom to top; the base of the compound rectangular weir crest 3 is of a reinforced concrete structure and is built on bedrock of the riverbed 2; the duplex rectangular weir crest 2 is convenient for monitoring the flow of river, stream and ditch water in mountainous areas in different periods;
(4) after the left weir body 1 and the compound rectangular weir crest 2 are dried, digging a water level monitoring device hole 8 for fixing a water level monitoring device 10 at the position, close to the compound rectangular weir crest 2, of the upstream of water flow, then placing the wood board 3 on the right side of the riverbed 4 and the flexible drainage water-stop film 6 laid on the wood board on the left side of the riverbed 4, guiding the water flow to the left side of the riverbed 4, and sealing the connection position of the water-stop film 6 and the riverbed 4;
(5) After the right side of the riverbed 4 is dried, a right weir body 3 is built, the base of the right weir body 3 is of a reinforced concrete structure and is built on riverbed bedrock, and the weir body is formed by pouring riverbed pebble mixed cement mortar;
(6) After the right weir body 3 is dried and solidified, taking out the wood board 3 and the water-resisting film 6; the water flows out in the duplex rectangular weir crest 2.
The construction method of the duplex rectangular flow weir provided by the embodiment of the invention has the advantages that the construction work amount is small, the cost is low, the weir body part of the weir body can be built by locally using the pebble-river mixed cement mortar in the construction process, the firmness and the sealing property of the weir body are improved, and a large amount of labor cost can be saved; the method has no influence on the local environment, is suitable for being widely applied to the construction work of the hydraulic monitoring flow weir in mountainous areas and tunnel areas, and has great market value.
A two-layer weir crest structure is adopted, the first layer of thin-wall weir crest 21 is used for monitoring small flow of mountain areas, tunnel areas and stream and river flows, and the second layer of bricklaying weir crest 22 is constructed by adopting cement bricklaying and is used for monitoring large flow in the flood season; the weir body is built on bedrock of the stream ditch section to effectively resist the washing of flood season mountain torrents, and a reservoir is formed behind the weir body to ensure that water flow smoothly flows out of a weir port to form natural water dropping; the design of the whole duplex thin-wall weir crest improves the scientific reasonability and the measurement accuracy of the flow weir.
Furthermore, the first layer of thin-wall weir crest 21 is formed into a thin-wall weir crest by adopting a stainless steel plate 23, and the thickness of the stainless steel plate 23 is 3-5 mm, so that small flow monitoring is facilitated; the thickness of the second layer of bricklaying weir crest 22 is 9 cm-11 cm.
Further, when the foundation is constructed, reinforcing steel bars and templates are drilled and arranged on bedrock of the riverbed 4, and the stainless steel plate 23 is arranged at the first layer of thin-wall weir crest 21 for concrete bottom building; and removing the template after the concrete is solidified.
Furthermore, a stainless steel pipe 9 is embedded in the water level monitoring device hole 8, small holes 91 are uniformly formed in the pipe body of the stainless steel pipe, and the water level monitoring device 10 is installed in the stainless steel pipe 9. The stainless steel pipe 9 with the small hole 91 is immersed below the water level, so that the water level in the water level monitoring device 10 is ensured to be consistent with the upstream water level of the duplex rectangular flow weir, and the accuracy of the monitoring data of the water level monitoring device 10 is ensured; when in use, the stainless steel tube is locked, so that the stability and the safety of the water level monitoring device 10 can be effectively protected.
further, the outer diameter of the stainless steel tube 9 is 5cm, and the wall thickness is 4 mm; the water level monitoring device 10 monitors the step length for 5 min. The precision of water level monitoring can reach 1mm, and the flow is calculated through monitoring the change of water level, can directly read the data that water level monitoring devices 10 surveyed in the field for the monitoring data of flow is more accurate timely.
Further, the width of the first layer of thin-wall weir crest 21, the width of the second layer of bricklayed weir crest 22, the maximum weir top height, the upper limit height of the small weir corresponding to the first layer of thin-wall weir crest 21, and the upper limit height of the large weir corresponding to the second layer of bricklayed weir crest 22 are measured. For calculation of the flow rate.
Further, the flow calculation of the compound rectangular flow weir adopts different formulas to calculate according to different water level heights; when the flow is small, the water level H before the weir is less than the maximum weir top height H1calculating the flow by adopting a formula (1); when the flow is large, the water level H in front of the weir is larger than the maximum weir top height H1Calculating the flow by adopting a formula (2);
wherein: q is the flow, m3s; m is a flow coefficient; b is1The width of the first layer of thin-wall weir crest is m; b is2The width of the second layer of bricklaying weir crest is m; g is the acceleration of gravity; h is the water level before the weir, m; p1The upper bank height of the small weir corresponding to the first layer of thin-wall weir crest is m; h is1m is the maximum weir crest height; p2and the height of the upper bank of the large weir corresponding to the second layer of bricklaying weir crest is m.
the flow is calculated by adopting different formulas according to the height of the water level in front of the weir, and the flow of the mountain ditches, rivers and streams in dry seasons with small water volume and the flow of the rivers and streams in the flood season can be accurately measured.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A construction method of a compound rectangular flow weir is characterized by comprising the following steps:
(1) Dividing the weir body into three parts including a left weir body, a compound rectangular weir crest and a right weir body, placing a wood board in the riverbed, paving a flexible drainage water-stop film on the wood board to guide water flow to the right side of the riverbed, and sealing the connection part of the water-stop film and the riverbed;
(2) Constructing a left weir body after the left side of the riverbed is dried, wherein the base of the left weir body is of a reinforced concrete structure and is constructed on the bedrock of the riverbed, and the weir body is formed by pouring riverbed pebble mixed cement mortar;
(3) constructing a compound rectangular weir crest next to the left weir body, wherein the compound rectangular weir crest comprises two layers, namely a first layer of thin-wall weir crest and a second layer of bricklayed weir crest from bottom to top, and the base of the compound rectangular weir crest is of a reinforced concrete structure and is constructed on riverbed bedrock;
(4) After the left weir body and the compound rectangular weir crest are dried, digging a water level monitoring device hole for fixing a water level monitoring device at the upstream of the water flow close to the compound rectangular weir crest, then placing the wood board at the right side of the riverbed and the flexible drainage water-stop film laid on the wood board at the right side of the riverbed at the left side of the riverbed, guiding the water flow to the left side of the riverbed, and sealing the connection part of the water-stop film and the riverbed;
(5) Constructing a right weir body after the right side of the riverbed is dried, wherein the base of the right weir body is of a reinforced concrete structure and is constructed on a brook bedrock, and the weir body is formed by pouring riverbed pebble mixed cement mortar;
(6) And after the right weir body is dried and solidified, taking out the wood board and the water-resisting film.
2. a method as claimed in claim 1, further comprising the step (7) of measuring the width of the first layer of thin-walled weir crest, the width of the second layer of bricked weir crest, the maximum weir crest height, the upper bank height of the small weir corresponding to the first layer of thin-walled weir crest, and the upper bank height of the large weir corresponding to the second layer of bricked weir crest.
3. The method as claimed in claim 2, wherein the first layer of thin-walled weir is a stainless steel plate having a thickness of 3mm to 5mm, and the second layer of bricklayed weir has a thickness of 9cm to 11 cm.
4. a method for constructing a compound rectangular flow weir as claimed in claim 3, wherein said foundation is constructed by drilling holes in the bed bedrock to install reinforcing bars and formworks, and installing said stainless steel plate at said first thin-walled weir to perform concrete bottoming; and removing the template after the concrete is solidified.
5. The method as claimed in claim 1, wherein the water level monitoring device is formed by embedding stainless steel pipes in the holes, the stainless steel pipes having small holes uniformly formed in the pipe bodies, and the water level monitoring device is disposed in the stainless steel pipes.
6. the method as claimed in claim 5, wherein the stainless steel pipe has an outer diameter of 5cm and a wall thickness of 4 mm; the water level monitoring device monitors the step length for 5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810556706.4A CN108824376B (en) | 2018-05-31 | 2018-05-31 | construction method of duplex rectangular flow weir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810556706.4A CN108824376B (en) | 2018-05-31 | 2018-05-31 | construction method of duplex rectangular flow weir |
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| Publication Number | Publication Date |
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| CN108824376A CN108824376A (en) | 2018-11-16 |
| CN108824376B true CN108824376B (en) | 2019-12-17 |
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| CN201810556706.4A Expired - Fee Related CN108824376B (en) | 2018-05-31 | 2018-05-31 | construction method of duplex rectangular flow weir |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105051503A (en) * | 2012-10-11 | 2015-11-11 | 鲁比康研究有限公司 | Flow measurement |
| CN207317879U (en) * | 2017-10-11 | 2018-05-04 | 贵州省水利水电勘测设计研究院 | A kind of flow measurement structure |
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2018
- 2018-05-31 CN CN201810556706.4A patent/CN108824376B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105051503A (en) * | 2012-10-11 | 2015-11-11 | 鲁比康研究有限公司 | Flow measurement |
| CN207317879U (en) * | 2017-10-11 | 2018-05-04 | 贵州省水利水电勘测设计研究院 | A kind of flow measurement structure |
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| CN108824376A (en) | 2018-11-16 |
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