CN214245624U - Vertical shaft rotational flow flood discharge tunnel - Google Patents
Vertical shaft rotational flow flood discharge tunnel Download PDFInfo
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- CN214245624U CN214245624U CN202120112980.XU CN202120112980U CN214245624U CN 214245624 U CN214245624 U CN 214245624U CN 202120112980 U CN202120112980 U CN 202120112980U CN 214245624 U CN214245624 U CN 214245624U
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Abstract
The utility model relates to a shaft whirl flood discharge hole belongs to shaft whirl flood discharge hole's construction passageway and arranges technical field. The slope-variable section is arranged on the bottom plate at the tail end of the upper flat section of the flood discharge tunnel, and the height difference between the upper flat section of the flood discharge tunnel and the volute dome can be fully reduced by increasing the gradient of the bottom plate at the rear half section of the upper flat section of the flood discharge tunnel; the tail end of the top arch of the upper flat section of the flood discharge tunnel is provided with an expanding excavation section, excavation slag materials are laid on a bottom plate of the rear section of the upper flat section of the flood discharge tunnel, the top arch of the expanding excavation section can be matched to form a construction channel, and then the construction of the volute dome can be carried out. The utility model discloses directly go up the flat section with the flood discharge tunnel and regard as the construction passageway of volute chamber and volute chamber dome above the flat section roof on the flood discharge tunnel, need not to plan again and build the construction passageway of volute chamber upper portion and volute chamber dome, furthest's saving the engineering investment, simplified the construction of shaft whirl flood discharge tunnel volute chamber dome.
Description
Technical Field
The utility model relates to a shaft whirl flood discharge hole belongs to shaft whirl flood discharge hole's construction passageway and arranges technical field.
Background
For the high dam reservoir hydroelectric engineering constructed in the high mountain gorge area, a diversion building (temporary building) needs to be constructed in order to meet the diversion requirement in the construction period. Meanwhile, in order to meet the requirement of the operation safety of the hub, water release buildings such as flood discharge and emptying are generally required to be specially arranged. In order to save the engineering investment as much as possible, flood discharge and emptying buildings consider adopting diversion tunnel reconstruction and combination as much as possible, wherein the flood discharge tunnel is combined with the diversion tunnel in a vertical shaft rotational flow mode, and the combination mode is successfully applied to large, medium and small power stations in China at present. The prior conventional vertical shaft rotational flow flood discharging tunnel has a three-dimensional structure as shown in figure 1.
During conventional design, the bottom plate of the upper flat section of the vertical shaft rotational flow flood discharging tunnel adopts uniform gradient, and in order to ensure that water flow of the upper flat section does not impact the top of the volute chamber after entering the volute chamber to start rotating, the top elevation of the volute chamber is generally higher than that of the upper flat section through numerical calculation and demonstration and analysis of a hydraulic model test. Because the height difference between the top of the upper cave section and the volute dome is large, construction machines cannot go deep into the volute dome through the upper cave section to carry out construction. Therefore, in order to meet the excavation and supporting construction of the volute chamber and the dome above the elevation of the top plate of the upper flat section of the vertical shaft, a construction branch hole reaching the volute chamber dome and the volute chamber above the elevation of the top plate of the upper flat section is planned and arranged according to comprehensive factors such as topographic and geological conditions, hinge arrangement and the like. The vertical shaft rotational flow flood discharging tunnel with the conventional design is shown in a schematic plan view in figure 2 and in a schematic longitudinal section view in figure 3.
The main disadvantages of the prior art are as follows:
1. because the height difference between the top of the upper cave section and the volute chamber dome is large, construction machines cannot go deep into the volute chamber dome through the upper cave section to carry out construction, and the like, a construction branch tunnel to the volute chamber dome and the volute chamber above the ceiling elevation of the upper cave section needs to be newly planned in order to meet the excavation and support construction of the volute chamber and the dome above the ceiling elevation of the upper cave section. In order to meet the requirement of passing of construction vehicles, the section of a construction branch tunnel is generally large; in order to coordinate with the arrangement of the junction, comprehensive factors such as terrain and geology, external traffic and the like are considered at the same time, the length of the construction branch tunnel is generally larger, so that the quantity of the construction branch tunnel excavation and supporting projects is increased, and the corresponding increase of project investment is larger.
2. In order to ensure the later permanent operation safety of the vortex chamber, the newly added construction branch hole needs to be permanently plugged, and the plugging is generally made of concrete. According to the calculation of relevant regulation specifications and similar engineering experience, the increased plugging engineering amount is also larger, and the engineering investment is further increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the vertical shaft rotational flow flood discharging tunnel can simplify a construction channel of a volute dome of the vertical shaft rotational flow flood discharging tunnel.
For solving the technical problem the utility model discloses the technical scheme who adopts is: the vertical shaft rotational flow flood discharging tunnel comprises an upper flat section of the flood discharging tunnel and a volute chamber, wherein the tail end of the upper flat section of the flood discharging tunnel is communicated with the side wall of the volute chamber, the elevation of the bottom surface of the upper flat section of the flood discharging tunnel is in a decreasing trend in the direction from the front end of the upper flat section of the flood discharging tunnel to the tail end, a slope-changing section is arranged on a bottom plate at the tail end of the upper flat section of the flood discharging tunnel, the gradient of the bottom plate of the slope-changing section is greater than the gradient of the bottom plate at the upper flat section of the flood discharging tunnel at the upstream side of the slope-changing section, and the tail end of the slope-changing section is connected with the side wall of the volute chamber; the tail end of a top arch of the upper flat section of the flood discharge tunnel is provided with an expanding excavation section, the elevation of the bottom surface of the top arch of the expanding excavation section presents an increasing trend, and the tail end of the expanding excavation section is connected with the side wall of the volute chamber.
Further, the method comprises the following steps: the length of the upper flat section of the flood discharge tunnel corresponding to the expanding excavation section is 20-25 m.
The utility model has the advantages that: the slope changing section is arranged on the bottom plate at the tail end of the upper flat section of the flood discharge tunnel, and the height difference between the upper flat section of the flood discharge tunnel and the volute dome can be fully reduced by increasing the gradient of the bottom plate at the rear half section of the upper flat section of the flood discharge tunnel; the tail end of the top arch of the upper flat section of the flood discharge tunnel is provided with an expanding excavation section, and excavation slag materials are laid on a bottom plate of the rear section of the upper flat section of the flood discharge tunnel, so that a construction channel can be formed by matching the top arch of the expanding excavation section, and then the construction of the volute dome can be carried out. The utility model discloses directly go up the flat section with the flood discharge tunnel and regard as the construction passageway of volute chamber and volute chamber dome above the flat section roof on the flood discharge tunnel, need not to plan again and build the construction passageway of volute chamber upper portion and volute chamber dome, furthest's saving the engineering investment, simplified the construction of shaft whirl flood discharge tunnel volute chamber dome.
Drawings
Fig. 1 is a schematic perspective view of a conventional vertical shaft rotational flow spillway tunnel.
Figure 2 is a schematic plan view of a conventionally designed shaft cyclone spillway tunnel.
Figure 3 is a schematic longitudinal section through a conventionally designed shaft cyclone spillway tunnel.
Fig. 4 is a schematic longitudinal section of the present invention.
Fig. 5 is a schematic diagram of the comparison between the present invention and the conventional shaft cyclone flood discharge tunnel at the position of section a-a in fig. 4.
Parts in the figures are labeled: 1-flood discharge hole upper flat section, 2-volute chamber, 101-slope changing section, 102-expand digging section, 3-import tower body, 4-volute chamber dome, 5-gradual change section, 6-shaft, 7-slope pressing reconstruction section, 8-flood discharge hole lower flat section, 9-construction branch hole, 10-backfill slag charge, 11-conventional design hole top, 12-conventional design hole bottom plate, 13-the utility model discloses hole top, 14-the utility model discloses hole bottom plate.
Detailed Description
The present invention will be further explained with reference to the drawings and the embodiments.
As shown in fig. 4 and 5, the shaft swirling flood discharging tunnel of the present invention comprises a flood discharging tunnel upper flat section 1 and a volute chamber 2, wherein the end of the flood discharging tunnel upper flat section 1 is communicated with the side wall of the volute chamber 2, the bottom surface elevation of the flood discharging tunnel upper flat section 1 is in a decreasing trend in the direction from the front end of the flood discharging tunnel upper flat section 1 to the end, the bottom plate at the end of the flood discharging tunnel upper flat section 1 is provided with a slope-changing section 101, the bottom plate gradient of the slope-changing section 101 is greater than the bottom plate gradient of the flood discharging tunnel upper flat section 1 at the upstream side of the slope-changing section 101, and the end of the slope-changing section 101 is connected with the side wall of the volute chamber 2; the top arch tail end of the upper flat section 1 of the flood discharge tunnel is provided with an expanding excavation section 102, the height of the bottom surface of the top arch of the expanding excavation section 102 is in an increasing trend, and the tail end of the expanding excavation section 102 is connected with the side wall of the volute chamber 2. The slope changing section 101 is arranged on the bottom plate at the tail end of the upper flat section 1 of the flood discharge tunnel, and the height difference between the upper flat section 1 of the flood discharge tunnel and the volute dome 4 can be fully reduced by increasing the slope of the bottom plate at the rear half section of the upper flat section 1 of the flood discharge tunnel; the tail end of the top arch of the upper flat section 1 of the flood discharge tunnel is provided with an expanding excavation section 102, excavation slag is paved on the bottom plate of the rear section of the upper flat section 1 of the flood discharge tunnel, a construction channel can be formed by matching with the top arch of the expanding excavation section 102, and then the construction of the volute dome 4 can be carried out. The utility model discloses directly with on the flood discharge hole flat section 1 as on the flood discharge hole the construction passageway of volute chamber 2 and volute chamber dome 4 more than the flat section 1 roof, need not to plan again and build the construction passageway of 2 upper portions of volute chamber and volute chamber dome 4, furthest's saving the engineering investment, simplified the construction of shaft whirl flood discharge hole volute chamber dome.
In order to facilitate the construction of the channel with better operating conditions, the length of the flood discharge tunnel upper flat section 1 corresponding to the expanded excavation section 102 is generally 20 m-25 m.
Examples
The utility model discloses when concrete implementation, the accessible is realized with following step:
the first step is as follows: the slope of the bottom plate of the back section of the upper flat section 1 of the flood discharge tunnel is increased, the slope can be confirmed through numerical calculation analysis and a hydraulicmodel test, the height of the dome 4 of the vortex chamber is reduced as much as possible on the premise that the water flow in the vortex chamber 2 does not impact the dome 4 of the vortex chamber, and the height difference between the top plate of the upper flat section 1 of the flood discharge tunnel and the dome 4 of the vortex chamber is preliminarily reduced. The bottom plate of the upper flat section 1 of the spillway tunnel is lowered in gradient, which is schematically shown in figure 4.
The second step is that: when the upper flat section 1 of the flood discharge tunnel is excavated, the top arch of the tunnel body within the last 20m range of the upper flat section 1 of the flood discharge tunnel is expanded and excavated, so that the height difference between the top plate of the upper flat section 1 of the flood discharge tunnel and the volute dome 4 is further reduced. The top of the flat section 1 on the spillway tunnel is schematically shown in figure 4, and a typical section of the expanded section is schematically shown in figure 5.
The third step: after the upper level section 1 of the flood discharge tunnel is excavated to the front section tunnel body bottom plate in a layering mode, the tunnel body bottom plate of the upper level section 1 of the flood discharge tunnel is lifted by adopting the excavated tunnel slag material of the upper level section 1 of the flood discharge tunnel, and a specific schematic diagram is shown in FIG. 4. After the bottom plate of the hole body is paved with the slag and lifted, construction machines such as an excavator can go to the top of the pad slag to go deep into the dome 4 part of the volute chamber to carry out excavation and support construction on the dome 4 of the volute chamber and the volute chamber at the upper part.
The fourth step: after excavation and supporting construction of the volute chamber dome 4 and the volute chamber 2 above the top plate of the upper flat section 1 of the spillway tunnel is completed, slag can be removed, and then bottom plate expanding excavation of the upper flat section 1 of the spillway tunnel is carried out until the design size and the elevation are reached. The size of the upper flat section 1 of the flood discharge tunnel after the expanding excavation is within the specification allowed range, and the tunnel stability requirements in the construction and later period of operation can be met by strengthening the support.
The utility model discloses an increase on the flood discharge hole 1 back half bottom plate slope of flush segment, the flood discharge hole 1 back half roof expand dig and bottom plate bedding excavation hole slag charge measure such as, alright with the height difference of flush segment 1 and volute chamber dome 4 on the fully reduced flood discharge hole, with the construction passageway of volute chamber 2 and volute chamber dome 4 on the flush discharge hole 1 above the flush segment 1 roof on the flush discharge hole, need not to plan the construction passageway of building volute chamber 2 upper portion and volute chamber dome 4 again. This structure only needs to go up 1 back end bottom slope of flat section to the flood discharge tunnel and suitably increases, carries out certain expanding to the 1 top of flat section on the flood discharge tunnel simultaneously and digs, and the construction is simple and convenient, and flat section 1 engineering increase is less on the flood discharge tunnel, when satisfying the engineering needs, furthest's saving the engineering investment.
Claims (2)
1. Shaft whirl flood discharge hole, including flood discharge hole upper flat section (1) and volute chamber (2), the terminal of flood discharge hole upper flat section (1) is linked together with the lateral wall of volute chamber (2), in the direction of the front end directional end by flood discharge hole upper flat section (1), the bottom surface elevation of flood discharge hole upper flat section (1) is descending trend, its characterized in that: a slope-changing section (101) is arranged on a bottom plate at the tail end of the upper flat section (1) of the flood discharge tunnel, the gradient of the bottom plate of the slope-changing section (101) is greater than that of the bottom plate of the upper flat section (1) of the flood discharge tunnel at the upstream side of the slope-changing section (101), and the tail end of the slope-changing section (101) is connected with the side wall of the volute chamber (2); the tail end of a top arch of the upper flat section (1) of the flood discharge tunnel is provided with an expanding excavation section (102), the elevation of the bottom surface of the top arch of the expanding excavation section (102) is in an increasing trend, and the tail end of the expanding excavation section (102) is connected with the side wall of the volute chamber (2).
2. A vertical cyclone flood tunnel according to claim 1, characterized in that: the length of the upper flat section (1) of the flood discharge tunnel corresponding to the expanding excavation section (102) is 20-25 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120112980.XU CN214245624U (en) | 2021-01-15 | 2021-01-15 | Vertical shaft rotational flow flood discharge tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120112980.XU CN214245624U (en) | 2021-01-15 | 2021-01-15 | Vertical shaft rotational flow flood discharge tunnel |
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| CN214245624U true CN214245624U (en) | 2021-09-21 |
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| CN202120112980.XU Active CN214245624U (en) | 2021-01-15 | 2021-01-15 | Vertical shaft rotational flow flood discharge tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233296A (en) * | 2021-12-09 | 2022-03-25 | 中国铁建大桥工程局集团有限公司 | Method for excavating horizontal section of vertical shaft flood discharge tunnel |
| CN114320303A (en) * | 2021-12-09 | 2022-04-12 | 中国铁建大桥工程局集团有限公司 | Method for excavating vertical shaft flood discharge tunnel body support |
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2021
- 2021-01-15 CN CN202120112980.XU patent/CN214245624U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233296A (en) * | 2021-12-09 | 2022-03-25 | 中国铁建大桥工程局集团有限公司 | Method for excavating horizontal section of vertical shaft flood discharge tunnel |
| CN114320303A (en) * | 2021-12-09 | 2022-04-12 | 中国铁建大桥工程局集团有限公司 | Method for excavating vertical shaft flood discharge tunnel body support |
| CN114233296B (en) * | 2021-12-09 | 2023-11-28 | 中国铁建大桥工程局集团有限公司 | Method for excavating horizontal section of vertical shaft flood discharge tunnel |
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