Flood diversion pipe band group of dam for above standard flood

Abstract

A flood diversion pipe band group of a dam for above standard flood belongs to the technical field of hydraulic engineering of dam flood diversion. In case that above standard flood comes, the flood diversion pipe band group is capable of realizing flood diversion to prevent an embankment from bursting; and the flood diversion pipe band group has the advantages of simple structure, finalized design and production, convenient transportation, fast construction, and low manufacturing cost. The flood diversion pipe band group comprises inlet hafnium U-shaped grooves, cage type trash racks, HDPE flap valves, flood diversion pipe bodies, outlet hafnium U-shaped grooves, water delivery bands each having a rigid framework and made of an artificially synthesized material, aprons of a geotechnical synthetic material, sandbag baffle sills, and color strip cloth sandbag scour prevention sections; the flood diversion pipe bodies along with the water delivery bands each having the rigid framework and made of the artificially synthesized material are arranged at equal distances and in parallel, and therefore, the flood diversion pipe band group of the same flood diversion point is constructed as required. The flood diversion pipe band group is arranged dispersedly along two sides, and capable of implementing temporary controllable flood diversion to a farmland at any place without permanently occupying the cultivated land; no special flood retarding basin is needed, and great calamity caused by concentrated flood diversion, and high-investment whole-line flood fighting can be avoided; the detachable and combinable flood diversion pipe band group can be quickly constructed when flood diversion is needed during flood-fighting and emergency rescues, and is convenient to use and manage.

Description

technical field [0001] The invention belongs to the technical field of embankment flood diversion and conservancy engineering, and in particular relates to a flood diversion pipe belt group for exceeding standard flood of embankments. Background technique [0002] At present, flood diversion (flood discharge) structures on earth dams include flood diversion gates, overwater earth dams, buried pipes under dams, vertical shaft spillways, siphon spillways and artificial embankment breaches for flood diversion. On lower river embankments, the pressure flow advantage of siphon spillway is not obvious due to the small head difference between upstream and downstream. In order to achieve the corresponding flood diversion, the section of the siphon spillway must be enlarged, and the cost must also be high. In addition, the flood diversion is proportional to the 1 / 2 power of the acting water head H, and it is not suitable for use due to the low super discharge capacity in case of supe...

AI Technical Summary

Problems solved by technology

In order to achieve the corresponding flood diversion, the section of the siphon spillway must be enlarged, and the cost must also be high. In addition, the flood diversion is proportional to the 1 / 2 power of the acting water head H, and it is not suitable for use due to the low super discharge capacity in case of super-standard floods; buried pipes under the dam , Shaft-type spillway also has the disadvantages of low excess discharge capacity and high cost, so it is not suitable for use; for low-level dams, the weir crest elevation should be raised to form an earth dam, and the water head above the weir is small and single-width The flow of flood diversion is limited, so the width of the weir must be increased and the overall cost will be high. If the weir crest elevation is reduced to increase the water head above the weir, a gate must be installed to retain water and the discharge channel is short, which is close to the structure of the flood diversion gate; The upper water head H is proportional to the 3 / 2 power, and it has super-drainage capability. It is the most ideal choice at present

[0003] However, the current river embankments with flood diversion gates are not suitable for scattered distribution of small flood diversion gates, because the addition of high-cost retaining walls in cold regions is often concentrated for flood diversion in cold regions. Flood diversion requires suitable lakes, bubbles or low-lying land as flood detention areas, and dikes in flood detention areas must be built; in order to increase flood diversion flow and reduce the cost of flood diversion gates, the elevation of flood diversion gate weirs should be lower, forming a deep foundation Therefore, there are hidden dangers of penetration damage, frost damage, and aging problems; flood diversion gates must be equipped with fixed working gates and hoists, and maintenance gates must be installed. For this reason, working bridges and maintenance bridges must be equipped, because it is necessary to block traffic. Sometimes it is necessary to build a traffic bridge, which is expensive and requires special personnel to maintain and manage the gates and hoists; the tailwater of the flood diversion gate for centralized flood diversion requires permanent flood diversion channels such as canals, ditches or rivers, and the flood diversion gates and dikes are not only expensive. It also permanently occupies a large amount of land resources; the construction period of the existing open reinforced concrete flood diversion gate is long, and it cannot be temporarily built in the event of a flood; and the probability of the reinforced concrete flood diversion gate being activated is low. Once the flood diversion is activated, the flood diversion lasts short. There are few opportunities for use, and a large number of river embankments need to build too many flood gates, which are often limited economically.

It is not economical to set up flood diversion gates in short-distance rivers due to the rapid rise and fall of rivers in mountainous areas in the upper reaches. In case of floods exceeding the standard, the embankment will burst. However, the value of the area protected by the expensive flood diversion gates is small, so it is not suitable to build flood diversion gates. Embankments without flood diversion gates encounter exceeding standards To fight the flood along the whole line, we can only invest a large number of people to build temporary sub-dikes along the line to retain water. As the water level drops, it must be dismantled in time to prevent landslides of the mother dike. This situation happens from time to time. If people break the embankment to divert the flood, the loss caused by the uncontrollable concentrated flood will also be very large. Moreover, once there is a vast ocean inside and outside the embankment, taking soil to block the mouth will not only cost It's not easy being tall

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