CN215289967U - Structure for diversion flood control of pre-buried culvert of dam foundation of flexible dam - Google Patents
Structure for diversion flood control of pre-buried culvert of dam foundation of flexible dam Download PDFInfo
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- CN215289967U CN215289967U CN202120363420.1U CN202120363420U CN215289967U CN 215289967 U CN215289967 U CN 215289967U CN 202120363420 U CN202120363420 U CN 202120363420U CN 215289967 U CN215289967 U CN 215289967U
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Abstract
The utility model discloses a structure for diversion flood control of a pre-buried culvert of a dam foundation of a flexible dam, which comprises the culvert, wherein an inlet gate well is arranged at the head part of the culvert, water is drained into the culvert and drained downwards, and a stop log gate slot is arranged on the inlet gate well; transverse seams are arranged at intervals in the culvert, and a concrete cushion is arranged at the bottom of the culvert; an upstream cofferdam is arranged between the entrance gate well and the dam body; and a downstream cofferdam is arranged behind the dam, the culvert penetrates out from the upstream cofferdam, the dam body and the downstream cofferdam foundation, a stilling pool is arranged at the outlet of the culvert, and the drained water flow is discharged into a downstream natural river channel after energy dissipation. The utility model discloses a pre-buried culvert of dam foundation carries out engineering water conservancy diversion flood, cancel water conservancy diversion tunnel import, export hole face and hole body excavation, strut work and reinforced concrete lining cutting, hole body consolidation grout, backfill work content such as grout, the engineering volume that has significantly reduced is favorable to accelerating engineering progress, reduction of erection time, saving the engineering investment.
Description
Technical Field
The utility model relates to a flexible dam foundation pre-buried culvert carries out the structure of water conservancy diversion flood, is applicable to hydraulic engineering and utilizes dam base culvert to carry out design and construction that reservoir water conservancy diversion flood structural arrangement, belongs to hydraulic and hydroelectric engineering technical field.
Background
For flexible dams such as earth-rock dams and rock-fill dams, in order to construct pivot buildings such as dams and spillways, upstream and downstream cofferdams need to be constructed in advance for retaining water, and river water is guided to the position behind the downstream cofferdam from the position before the upstream cofferdam by using diversion tunnels. The diversion tunnel is an engineering measure which is frequently used and is used for diversion and flood control in a construction period, namely, the tunnel is excavated in a mountain body according to a designed section, and river water is drained from the tunnel during diversion and flood control so as to ensure the dry construction of the engineering. The diversion tunnel is a temporary building generally, and after the construction is completed, the diversion tunnel is discarded generally and is subjected to plugging treatment.
For example, the invention patent with the publication number of CN106759161A discloses a staged plugging structure of a large-section diversion tunnel and a construction method. The plugging structure comprises a water gate, partition piers, an upstream cofferdam, a downstream cofferdam, a first-stage plugging body, a second-stage plugging body and concrete brackets. The water gate is arranged at the inlet of the diversion tunnel; the separation pier is arranged at the inlet section of the diversion tunnel and is connected with the side gate pier of the water gate, which is positioned in the middle of the diversion tunnel; the upstream cofferdam is positioned at the inlet of the diversion tunnel and arranged beside the sluice; the downstream cofferdam is arranged between the dividing pier and the diversion tunnel concrete lining and is positioned at the downstream end of the dividing pier; the first-stage plugging body is arranged in an enclosed area of an upstream cofferdam, a downstream cofferdam, partition piers and diversion tunnel concrete linings; the second-stage plugging body is arranged at the downstream of a plugging gate of the sluice; the concrete bracket is arranged in the first-stage plugging body, and the lower part of the concrete bracket is provided with a lifting hook for lifting the plugging gate. According to the scheme, the problems of difficult plugging and difficult construction of the large-diameter diversion tunnel are solved by using flood characteristic conditions in different diversion periods.
However, the size of the diversion tunnel is based on the requirement of diversion flood discharge capacity, generally, an urban door opening or a round structure is adopted, the excavation and support work of an entrance opening face, an exit opening face and a tunnel body is needed, a reinforced concrete lining is often needed to be arranged to carry out permanent support on the tunnel body so as to prevent surrounding rocks from deforming or collapsing, and engineering measures such as consolidation grouting, backfill grouting and the like are needed to be taken on the tunnel body so as to ensure the stability and safety of the structure. Diversion tunnel length is generally longer, leads to the engineering volume great, and buries deeply in the mountain body, and the stone square tunnel is dug the construction degree of difficulty great, also has great potential safety hazard in the work progress, and the construction cycle is long, and the engineering investment is big. Therefore, for the flexible dam, an engineering measure for diversion flood control without adopting a diversion tunnel is required to reduce the engineering quantity, accelerate the engineering progress, save the engineering investment and reduce the engineering construction safety risk.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art not enough, provide a structure that the pre-buried culvert of flexible dam foundation carries out water conservancy diversion flood.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model discloses a structure for diversion flood control of a pre-buried culvert of a flexible dam foundation, which comprises a culvert, wherein an inlet door well is arranged at the head part of the culvert, water is drained into the culvert and drained downwards, and a stop log door slot is arranged on the inlet door well; transverse seams are arranged at intervals in the culvert, and a concrete cushion is arranged at the bottom of the culvert; an upstream cofferdam is arranged between the entrance gate well and the dam body; and a downstream cofferdam is arranged behind the dam, the culvert penetrates out from the upstream cofferdam, the dam body and the downstream cofferdam foundation, a stilling pool is arranged at the outlet of the culvert, and the drained water flow is discharged into a downstream natural river channel after energy dissipation.
The grooves of the culvert are buried along the river direction at the riverbed, the culvert adopts a pipe culvert or box culvert form, and the foundation is located on the bedrock.
Forming an inverted trapezoidal excavation section when the culvert foundation is dug; and backfilling concrete is poured on the two sides and the top of the culvert to form an integral stable structure.
An impervious body is arranged in the dam body of the flexible dam, curtain grouting is carried out on the dam foundation to form an impervious curtain, a plug is arranged at the intersection position of the impervious curtain line and the culvert so as to plug the culvert in the later period, and a grouting cover is arranged at the bottom of the culvert at the plug position.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the dam foundation pre-buried culvert is adopted for engineering diversion and flood control, and the working contents of diversion tunnel inlet, outlet tunnel faces, tunnel body excavation, support work, reinforced concrete lining, tunnel body consolidation grouting, backfill grouting and the like are eliminated, so that the engineering quantity is greatly reduced, the engineering progress is accelerated, the construction period is shortened, and the engineering investment is saved.
(2) Compared with the construction of digging a square tunnel with diversion holes and stones, the construction of digging the embedded culvert in the riverbed slot greatly reduces the safety risk of engineering construction.
(3) The inlet gate well is arranged at the head of the dam foundation embedded culvert, the stilling pool is arranged at the tail of the dam foundation embedded culvert, and the inlet gate well, the stilling pool and the upstream cofferdam and the downstream cofferdam form a diversion flood control system together, so that the water coming from the upstream of the river channel is guided from the culvert to the stilling pool to be discharged into the downstream river channel after being fully dissipated, dry land construction is facilitated during filling of the dam body of the flexible dam, and the construction quality of the engineering is guaranteed.
(4) The culvert is of a cast-in-place reinforced concrete structure, the transverse joints are arranged at a certain distance, the concrete cushion is arranged at the bottom of the culvert, the culvert is prevented from being damaged and seeped due to temperature stress and uneven settlement of the foundation, and the filling quality of the dam body can be ensured.
(5) And arranging a plug at the intersection position of the dam seepage-proofing curtain line in the culvert, plugging the culvert at the later stage, arranging a grouting cover at the bottom of the culvert at the plug position, and performing construction of structures such as an upper culvert and the like after grouting construction of the partial curtain is finished, so that the integral effect of dam seepage prevention can be ensured.
Drawings
Fig. 1 is a plan view of the present invention;
FIG. 2 is a longitudinal section of a dam bottom embedded culvert;
FIG. 3 is a cross-sectional view of a dam bottom embedded box culvert;
FIG. 4 is a cross-sectional view of a dam bottom embedded pipe culvert;
FIG. 5 is a cross-sectional view of a dam bottom embedded box culvert plug section;
FIG. 6 is a cross-sectional view of a dam bottom embedded pipe culvert plug section.
The labels in the figures are: 1-entrance gate well; 2-a stop log door slot; 3-culvert; 4-upstream cofferdam; 5-plug; 6-downstream cofferdam; 7-stilling pool; 8-grouting and covering weight; 9-transverse sewing; 10-concrete bedding; 11-backfilled concrete, 12-impervious curtain, 13-impervious body and 14-dam body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the following detailed description of the embodiments of the present invention will be made with reference to fig. 1 to 6.
As shown in fig. 1 to 6, the present invention includes the following components: the system comprises an inlet door well 1, a stop log door slot 2, a culvert 3, an upstream cofferdam 4, a choke plug 5, a downstream cofferdam 6, a stilling pool 7, a grouting cover weight 8, a transverse seam 9, a concrete cushion layer 10, backfilled concrete 11 and the like. The main implementation process is as follows:
the method comprises the steps of excavating a groove for burying the culvert 3 in a river bed along a river direction groove, wherein the groove can be flexibly arranged according to actual geology and topographic conditions, calculating the flow discharge capacity of the culvert 3 according to the flow guiding flood discharge to determine the structural size of the culvert, the culvert 3 can adopt a pipe culvert or box culvert form (shown in figures 3 and 4 respectively), a foundation needs to be located on bedrock, overlarge settlement of the foundation is avoided to cause structural damage of the culvert 3, meanwhile, the interval between 3 intervals of the culvert is 8-15 m, a transverse seam 9 is arranged at the bottom of the culvert, and a 10 cm-thick concrete cushion layer 10 is arranged at the bottom of the culvert, so that structural damage and water seepage caused by temperature stress and uneven settlement of the foundation are avoided.
An inlet door well 1 is arranged at the head part of the culvert 3, water is drained into the culvert 3 and is drained downwards, and a stop log door groove 2 is arranged on the inlet door well 1, so that the culvert 3 is conveniently plugged by adopting a reinforced concrete prefabricated stop log door in the later period.
An upstream cofferdam 4 is arranged between the inlet gate shaft 1 and the dam body 14, and proper anti-seepage treatment measures are taken for the upstream cofferdam 4 to block the upstream incoming water, so that the water flow can flow into the inlet gate shaft 1 and then is discharged from the culvert 3.
A downstream cofferdam 6 is arranged behind the dam, the culvert 3 penetrates out from the upstream cofferdam 4, the dam body and the downstream cofferdam 6 foundation, and a stilling pool 7 is arranged at the outlet of the culvert 3 to dissipate the energy of the downward flow and discharge the downward flow into a downstream natural river channel, so that the phenomenon that the flow velocity of the flow is too large to erode and damage a downstream river bed is avoided, and the safety of the dam is further endangered.
When the culvert 3 foundation trench is dug, an inverted trapezoidal excavation section is formed, the backfill concrete 11 is poured on the two sides and the top of the culvert 3 to form an integral stable structure, and then the dam body 14 is filled on the upper part to ensure the safety of the structure.
In order to ensure the seepage-proofing effect of a dam body 14, a flexible dam is generally provided with a seepage-proofing material to form a seepage-proofing body 13, curtain grouting is carried out on a dam foundation to form a seepage-proofing curtain 12, a plug 5 is arranged at the intersection position of a seepage-proofing curtain line and a culvert 3 so as to plug the culvert 3 at the later stage, so that the integral seepage-proofing effect is ensured, and a grouting cover weight 8 is arranged at the bottom of the culvert at the position of the plug 5, and the thickness of the grouting cover is not less than 50 cm. During construction, the grouting cover weight 8 is firstly constructed, and the construction of the structures of the upper culvert pipe 3 and the like is carried out after the grouting construction of the partial curtain is finished.
The utility model discloses a construction method as follows:
the first step is as follows: and determining the arrangement positions of the axial line of the culvert pipe 3, the upstream cofferdam 4 and the downstream cofferdam 6 according to the site terrain and geological conditions.
The second step is that: and carrying out groove digging construction on the culvert pipe 3 foundation.
The third step: pouring construction is carried out on a grouting cover weight 8 at the bottom of the culvert 3 at the position of the plug 5.
The fourth step: and drilling and grouting the curtain at the intersection position of the seepage-proofing curtain 12 and the culvert 3.
The fifth step: and constructing a well door well 1, a culvert 3 and a stilling pool 7.
And a sixth step: and constructing an upstream cofferdam 4 and a downstream cofferdam 6.
The seventh step: the water flow is converged into the inlet gate well 1 and then discharged from the culvert 3 to the stilling basin to smooth the downstream natural river after energy dissipation.
Eighth step: and after the dam is filled, temporarily plugging the entrance gate shaft 1 by using a stop log gate, and then constructing a plug 5.
Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications and equivalents may be made without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides a structure that pre-buried culvert of flexible dam foundation carries out water conservancy diversion flood, its characterized in that: comprises a culvert (3), wherein an inlet door well (1) is arranged at the head part of the culvert (3), water is drained into the culvert (3) and drained downwards, and a stop log door groove (2) is arranged on the inlet door well (1); the culvert (3) is provided with transverse seams (9) at intervals, and the bottom of the culvert is provided with a concrete cushion (10); an upstream cofferdam (4) is arranged between the entrance gate shaft (1) and the dam body (14); a downstream cofferdam (6) is arranged behind the dam, the culvert (3) penetrates out from the foundation of the upstream cofferdam (4), the dam body (14) and the downstream cofferdam (6), and a stilling pool (7) is arranged at the outlet of the culvert (3) and discharges the drained water flow into a downstream natural river channel after energy dissipation.
2. The structure for diversion flood control of the pre-buried culvert of the dam foundation of the flexible dam according to claim 1, characterized in that: the grooves of the culvert (3) are buried along the river direction at the riverbed, the culvert (3) adopts a pipe culvert or box culvert form, and the foundation is located on bedrock.
3. The structure for diversion flood control of the pre-buried culvert of the dam foundation of the flexible dam according to claim 1, characterized in that: when the culvert (3) foundation trench is dug, an inverted trapezoidal excavation section is formed; and backfilling concrete (11) is poured on two sides and the top of the culvert (3) to form an integral stable structure.
4. The structure for diversion flood control of the pre-buried culvert of the dam foundation of the flexible dam according to claim 1, characterized in that: an impervious body (13) is arranged in a dam body (14) of the flexible dam, curtain grouting is carried out on a dam foundation to form an impervious curtain (12), a plug (5) is arranged at the intersection position of an impervious curtain line and the culvert (3) so as to plug the culvert (3) at the later stage, and a grouting cover (8) is arranged at the bottom of the culvert at the position of the plug (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120363420.1U CN215289967U (en) | 2021-02-08 | 2021-02-08 | Structure for diversion flood control of pre-buried culvert of dam foundation of flexible dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120363420.1U CN215289967U (en) | 2021-02-08 | 2021-02-08 | Structure for diversion flood control of pre-buried culvert of dam foundation of flexible dam |
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| Publication Number | Publication Date |
|---|---|
| CN215289967U true CN215289967U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120363420.1U Active CN215289967U (en) | 2021-02-08 | 2021-02-08 | Structure for diversion flood control of pre-buried culvert of dam foundation of flexible dam |
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| CN (1) | CN215289967U (en) |
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2021
- 2021-02-08 CN CN202120363420.1U patent/CN215289967U/en active Active
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