CN209873730U - Down-the-hole type upper reaches stagnant water accident access door heightening door lintel - Google Patents
Down-the-hole type upper reaches stagnant water accident access door heightening door lintel Download PDFInfo
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- CN209873730U CN209873730U CN201920320845.7U CN201920320845U CN209873730U CN 209873730 U CN209873730 U CN 209873730U CN 201920320845 U CN201920320845 U CN 201920320845U CN 209873730 U CN209873730 U CN 209873730U
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Abstract
The utility model relates to a hydraulic and hydroelectric engineering technical field especially relates to a down-the-hole type upper reaches stagnant water accident access door increases formula lintel. A down-the-hole type upper stream water stop accident access door heightening door lintel which is arranged at the bottom end of an upper stream chest wall; the door head comprises a door head panel, a water stop seat plate, a bottom plate, a panel cross beam and a rib plate; the door lintel panel and the bottom plate are welded at an acute angle; the water stop seat plate is arranged at the lower part of the door lintel panel; the panel beam is vertically arranged on the door lintel panel; the rib plates are welded on three sides to fixedly combine the door lintel panel, the bottom plate and the panel beam into a whole; the height of the door lintel is greater than the aperture height. The utility model relates to an upper reaches breastwork angle bead bears high-speed rivers impact load to with accident access door top stagnant water mating reaction, prevent to close a large amount of water directive door tops of door in-process, reduce the door body vibration of accident access door closing door in-process, reduce the gate slot and the near regional pulsating pressure intensity of mesopore runner, improve mesopore runner flow state.
Description
Technical Field
The utility model relates to a hydraulic and hydroelectric engineering technical field especially relates to a down-the-hole type upper reaches stagnant water accident access door increases formula lintel.
Background
Flood discharge center holes (or called deep holes, see figure 1) of large hydropower station dams are generally provided with down-the-hole type upstream water stop accident access doors at the center hole inlets, and the access doors are operated by dam top door machines. The outlet is provided with an arc-shaped working gate which is operated by a hydraulic hoist. Under the normal condition, the arc-shaped working gate is operated by a hydraulic hoist to open and discharge flood, and is closed by the hydraulic hoist after the flood discharge is finished. If the arc-shaped working door is in an accident in the opening or closing process and cannot be normally opened or closed, the inlet accident inspection door is required to be operated by the gate machine at the top of the dam to close the water gate to cut off water flow, and conditions are created for inspecting the arc-shaped working gate and the hydraulic hoist. In the process of closing the door of the accident access door, the problem of insufficient air supply of the door slot is particularly prominent, so that the violent vibration of the gate is easily caused, and the operation safety of the accident access door is influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem that prior art exists, provide a down-the-hole type upper reaches stagnant water accident access door heightening lintel. The utility model discloses can reduce the door body vibration of accident access door closing door in-process, improve mesopore runner flow state, make simple to operate.
As shown in fig. 2, in the emergency access door with water stop arranged at the upstream side, the result of a hydraulics test shows that in the process that the down-the-hole type upstream water stop emergency access door enters the opening from the bottom edge of the gate to the gate is completely closed, a large amount of high-pressure water in the middle hole flow passage passes through the top of the door from a gap (with the width of about 100mm) between the upstream panel and the upstream breast wall of the emergency access door and then diffuses and splashes, so that an air supply passage between the downstream panel and the gate groove of the emergency access door is blocked, and the downstream air supply of the emergency access door is. Because the middle hole flow passage is insufficient in air supply in the door closing process, an extremely unstable negative pressure cavity area B can be formed in the top area of the downstream flow passage of the accident access door, and the pulsating pressure intensity near the negative pressure cavity area is high; and because the jet flow water flow velocity is extremely high, an instantaneous negative pressure area A area can appear near an upstream panel of the accident access door, and the area is accompanied with the appearance of transverse axis vortexes. The negative pressure condition formed by the jet flow and the impact of the water body in the door closing process seriously influences the operation safety of the door body and the door slot and the movable water door closing of the accident access door.
As shown in fig. 3, in order to solve the problem of insufficient air supply of the gate slot in the closing process of the emergency access door, in the actual process of the existing engineering, a vent pipe with the diameter of 2-3 m is arranged at the position of the top of the gate slot 2m left and right at the downstream of the emergency access door, so that a region B of the top of a flow channel of a flood discharge orifice is provided with a smooth ventilation channel, and the flow state of the flood discharge orifice and the pressure characteristic near the gate slot region are improved. However, a certain gap still exists between the accident access door and the upstream breast wall, so that the water body can still cross the door top and flow downstream and the flow velocity of the water flow is high in the door closing process, so that the region A of the upstream panel part of the accident access door still has instantaneous extreme value negative pressure, and the downstream panel and the bottom edge are sealed by the water curtain at the moment, so that ventilation cannot be performed, the maintenance time of the extreme value negative pressure is long, and the accident access door is influenced to be closed smoothly.
A down-the-hole type upper stream water stop accident access door heightening door lintel is characterized in that: the door lintel is arranged at the bottom end of the upstream breast wall; the door head comprises a door head panel, a water stop seat plate, a bottom plate, a panel cross beam and a rib plate; the door lintel panel and the bottom plate are welded at an acute angle; the water stop seat plate is arranged at the lower part of the door lintel panel; the panel beam is vertically arranged on the door lintel panel; the rib plates are welded on three sides to fixedly combine the door lintel panel, the bottom plate and the panel beam into a whole; the height of the door lintel is greater than the aperture height H.
Further, the gap between the door lintel panel and the accident access door top water stop is maintained at about 1 cm.
The utility model provides an increase formula lintel bears high-speed rivers impact load as upper reaches chest wall angle bead to with accident access door top stagnant water mating reaction, prevent to close a large amount of water directive door tops of door in-process, lintel simple structure, wholeness good.
The door head panel of the utility model is mainly used for installing the water stop seat board on the top of the gate and is used as a guide structure for the groove entering of the accident access door and the water stop falling position on the top of the accident access door; the heightened door lintel panel and the top of the accident access door have a water stop function in a matching manner, so that the gap between the upstream panel and the upstream breast wall in the closing process of the gate is reduced; the bottom plate bears the impact load of high-speed water flow borne by the door lintel structure; the water stop seat plate is used as a top water stop rubber supporting seat of the emergency access door, and the gate is tightly attached to the top water stop rubber after being closed to realize water tightness; the rib plates are welded with the panel beam and the door lintel panel to fixedly combine the door lintel structure into a whole for enhancing the strength and rigidity of the whole structure of the door lintel.
Add the heightened lintel and compare with the ventilation pipe, has the following outstanding advantages:
1. the added heightened door head can reduce door body vibration in the door closing process of the accident access door, reduce the pulsating pressure intensity of the door groove and the area near the runner, improve the flow state of the middle hole runner and has better effect than that of the added vent pipe;
2. the mounting area of the heightened door lintel is only the local position of the bottom end of the upstream breast wall, and compared with the mounting range of the vent pipe directly communicated with the dam crest, the mounting area is simple in manufacturing and mounting processes;
3. the heightened door lintel is made of few materials, and the economic cost is extremely low compared with that of a breather pipe.
Drawings
Fig. 1 is a cross-sectional view of a flood discharge center hole of a large hydropower station, and the direction of a horizontal arrow is a flow direction.
Fig. 2 is a schematic diagram of the closing process of a down-the-hole type upstream water stop accident access door without a vent pipe, wherein the direction of a horizontal arrow is the flow direction, and the direction of a vertical arrow is the air supplement direction.
Fig. 3 is a schematic diagram of the process of closing the emergency access door under the condition of additionally arranging the vent pipe, wherein the direction of a horizontal arrow is the flow direction, and the direction of a vertical arrow is the air replenishing direction.
Fig. 4 is addding the utility model discloses accident access door closes the door process schematic diagram under the condition, and horizontal arrow point direction is the flow direction, and perpendicular arrow point direction is the tonifying qi direction.
Fig. 5 is a schematic cross-sectional view of the structure of the present invention.
Fig. 6 is a schematic front view of the structure of the present invention.
In the figure: 1-accident access door, 2-dam top portal crane, 3-arc working gate, 4-hydraulic hoist, 5-gate groove, 6-upstream breast wall, 7-air supply channel, 8-mesopore flow channel, 9-vent pipe, 10-heightened type door lintel, 1.1-accident access door top water stop, 10.1-door lintel panel, 10.2-water stop seat plate, 10.3-bottom plate, 10.4-panel cross beam, 10.5-rib plate, and H is the height of an orifice.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but they are not to be construed as limiting the invention, and are presented by way of example only, and the advantages of the invention will become more apparent and can be easily understood by description.
Referring to fig. 5 and 6, the down-the-hole type upstream water-stopping accident access door heightening type door lintel comprises a door lintel panel 10.1, a water-stopping seat plate 10.2, a bottom plate 10.3, a panel cross beam 10.4 and a rib plate 10.5; the door lintel panel 10.1 and the bottom plate 10.3 are used as main structures of the door lintel 10 and are butted and welded together at a certain angle; the door lintel panel 10.1 is used as a down-the-hole type upstream water stop accident access door 1 entering door slot 5 and a guide structure for the top water stop 1.1 falling position of the accident access door; the water-stopping seat plate 10.2 is arranged on the surface of the door lintel panel 10.1, and the installation position of the water-stopping seat plate 10.2 is determined according to the position of water stopping 1.1 on the top of the accident access door; the panel cross beam 10.4 is vertically arranged on the back surface of the lintel panel 10.1, the panel cross beam 10.4 is in butt joint welding with the lintel panel 10.1, the panel cross beam 10.4 is mainly used for enhancing the structural strength and rigidity of the lintel panel 10.1, and the arrangement interval and the structural size are determined according to the uplifting pressure born by the lintel panel 10.1; the rib plate 10.5 is fixedly connected with the door lintel panel 10.1 and the panel beam 10.4 into a whole through three-side welding. The heightened door lintel 10 is a welded structural member, and other connecting methods do not limit the utility model.
Referring to fig. 4, the down-the-hole type upstream water-stopping emergency access door heightened door lintel 10 is installed at the bottom end of an upstream breast wall 6 according to the arrangement requirement of the top water stop 1.1 of the emergency access door; the door lintel panel 10.1 faces one side of the door slot 5, the upper part of the door lintel panel 10.1 is connected with the first-stage concrete of the upstream breast wall 6, the lower part of the door lintel panel is provided with a water-stopping seat plate 10.2, and the surface direction of the door lintel panel 10.1 is consistent with the opening and closing running direction of the accident access door 1; the bottom surface of the bottom plate 10.3 is level with the top surface of the inlet of the flow channel 8. The height of the door lintel 10 is greater than the flood discharge mesopore aperture height H.
Referring to fig. 4, in the whole process that the bottom edge of the down-the-hole type upstream water-stop accident access door 1 starts to enter the middle-hole runner 8 until the accident access door 1 is closed, the gap between the panel 10.1 of the heightening type door lintel 10 and the top water stop 1.1 of the accident access door is always controlled to be about 1cm, the heightening type door lintel 10 ensures that when the accident access door 1 just enters the orifice of the flood discharge middle-hole runner 8, the top water stop 1.1 of the accident access door reaches the top position of the door lintel panel 10.1 and is basically attached to the door lintel panel 10.1, a large amount of water is effectively blocked and ejected between the upstream panel of the accident access door 1 and the upstream breast wall 6, the air supply channel 7 between the downstream panel of the gate and the gate slot 5 is ensured to be unblocked, the gate vibration phenomenon caused by extreme negative pressure in the partial area of the upstream panel of the accident access door is basically eliminated, the flow state of the, the pulsating pressure intensity of the gate slot and the middle hole flow passage is reduced.
The utility model discloses can produce apparent economic effect. Calculating by taking a water retaining head of a down-the-hole type upstream water stopping accident access door of 80m (difference between a normal water storage level and a sill elevation), a diameter of a vent pipe of 2m and 10 flood discharge mesopore orifices (in the existing engineering, a Wudongde hydropower station is provided with 6 flood discharge mesopores, and a three gorge hydropower junction is provided with 22 flood discharge mesopores, so that 10 pores and 6m multiplied by 8m of orifice sizes are taken as compromise values of most engineering) as an example:
1) by adopting the heightening door lintel of the utility model, the single-hole engineering amount is about 20t, the manufacturing and installation cost per ton is about 1.0 ten thousand yuan, and the total cost of 10 holes is 10 multiplied by 20 multiplied by 1.0 which is 200 ten thousand;
2) the length of the vent pipe is 100m, the single-hole engineering amount is about 60t, the single-hole manufacturing and installation cost is about 1.5 ten thousand yuan, and the total cost of 10 holes is 10 multiplied by 60 multiplied by 1.5 which is 900 ten thousand. The direct economic cost of the ventilation pipe structure is about 4.5 times of that of the heightened door lintel structure, the installation period of the ventilation pipe structure is long, the installation difficulty is high, and the indirect economic cost is higher than that of the heightened door lintel structure.
The parts of the present invention not specifically described are the parts known to those skilled in the art or the ordinary skilled in the art. The above description is only a preferred example of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (2)
1. A down-the-hole type upper stream water stop accident access door heightening door lintel is characterized in that: the door lintel (10) is arranged at the bottom end of the upstream breast wall (6); the door lintel (10) comprises a door lintel panel (10.1), a water stop seat plate (10.2), a bottom plate (10.3), a panel cross beam (10.4) and a rib plate (10.5); the door lintel panel (10.1) is welded to the bottom plate (10.3) at an acute angle; the water stop seat plate (10.2) is arranged at the lower part of the door lintel panel (10.1); the panel cross member (10.4) is arranged vertically on the lintel panel (10.1); the rib plate (10.5) is fixedly connected with the door lintel panel (10.1), the bottom plate (10.3) and the panel cross beam (10.4) into a whole through three-side welding;
the height of the door lintel (10) is greater than the aperture height H.
2. A down-the-hole upstream water stop accident access door raised lintel as claimed in claim 1, wherein: the gap between the door lintel panel (10.1) and the accident access door top water stop (1.1) is maintained at about 1 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920320845.7U CN209873730U (en) | 2019-03-14 | 2019-03-14 | Down-the-hole type upper reaches stagnant water accident access door heightening door lintel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920320845.7U CN209873730U (en) | 2019-03-14 | 2019-03-14 | Down-the-hole type upper reaches stagnant water accident access door heightening door lintel |
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| Publication Number | Publication Date |
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| CN209873730U true CN209873730U (en) | 2019-12-31 |
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| CN201920320845.7U Active CN209873730U (en) | 2019-03-14 | 2019-03-14 | Down-the-hole type upper reaches stagnant water accident access door heightening door lintel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778792A (en) * | 2019-03-14 | 2019-05-21 | 长江勘测规划设计研究有限责任公司 | Down-the-hole type upstream sealing emergency overhaul gate increases formula lintel |
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2019
- 2019-03-14 CN CN201920320845.7U patent/CN209873730U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778792A (en) * | 2019-03-14 | 2019-05-21 | 长江勘测规划设计研究有限责任公司 | Down-the-hole type upstream sealing emergency overhaul gate increases formula lintel |
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