CN207537987U - The narrow toe board arrangement of the high CFRD in Narrow Valleys area - Google Patents
The narrow toe board arrangement of the high CFRD in Narrow Valleys area Download PDFInfo
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- CN207537987U CN207537987U CN201721645227.7U CN201721645227U CN207537987U CN 207537987 U CN207537987 U CN 207537987U CN 201721645227 U CN201721645227 U CN 201721645227U CN 207537987 U CN207537987 U CN 207537987U
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Abstract
The utility model belongs to hydraulic and hydroelectric engineering field, specifically discloses a kind of narrow toe board arrangement of high CFRD in Narrow Valleys area, it is intended to solve the problems, such as how to reduce the depth-width ratio of narrow toe board to enhance its stability.The narrow toe board arrangement, including narrow toe board, barrier sheet and panel, the narrow toe board is arranged on riverbed basis and two sides basement rock, and the downstream end face of narrow toe board includes top incline and downside, the panel is obliquely installed, and lower end and the top incline of panel link together；Key-wall is further included, the key-wall is arranged on the bottom surface at narrow toe slab downstream end, and the barrier sheet is arranged on the downstream side of key-wall and links together with the downstream end face of key-wall.By setting key-wall on the bottom surface at narrow toe slab downstream end, and pass through key-wall and connect with barrier sheet, the water retaining height of narrow toe board is effectively reduced, the depth-width ratio of narrow toe board is obviously reduced relative to the narrow toe board used in existing structure, enhances the narrow toe board stability of itself under high water head effect.
Description
Technical field
The utility model belongs to hydraulic and hydroelectric engineering field, and in particular to a kind of high CFRD in Narrow Valleys area
With narrow toe board arrangement.
Background technology
Rock mainly includes enrockment dam body, toe board and panel three parts, and toe board is as face dam seepage control system
In important component, be dam surface anti-seepage system and foundation anti-seepage system connecting elements, be arranged in face slab for water retaining
Periphery, and be located on riverbed basis and two sides basement rock.Toe board be both foundation grouting workbench and periphery fissure according to
Support, the impervious body that toe board is collectively formed more than the dam foundation with panel by being equipped with the periphery fissure of water sealing structure；Meanwhile toe board is with passing through
Treated that basement rock is linked to be entirety for consolidation grouting, grout curtain, closes the seepage channel of below ground, forms complete impervious body
System, plays a part of forming a connecting link.
There are many factor needed to be considered during the special status of toe board determines toe slab design, using different design sides
Case is different to the considerations of these factors, carries out being considered as foundation excavation, panel stress, sealing arrangement, steel during toe slab design
The factors such as muscle arrangement and execution conditions.In the design of toe board, the toe board layout pattern at riverbed position is flat toe board, two
The variation of the layout pattern in bank toe board cross section causes shape of plinth to be generally oblique two kinds of toe board peace toe board.
1) oblique toe board：It excavates into the parallel or plane close to the identical gradient with bank slope toe board bottom surface.This arrangement form
Excavation project amount is small, especially for precipitous landform and the good bank slope of rock integrality, it is possible to reduce excavate, but due to toe board
With certain cross fall, therefore during toe board construction, complex-shaped, formwork erection, concreting, consolidation grouting and the curtain of reinforcing bar
Curtain grouting is all relatively difficult.
2) flat toe board：Toe board cross section upper bottom surface line is horizontal line, and the angle between panel and toe board top surface line is with toe board
The angle of cut between axis and the axis of dam changes and changes.The advantages of flat toe board bodily form is that traffic, the formwork erection of toe board, concrete pour
It builds, drill and is in the milk and is more convenient, provide drainage channel, avoid that heavy rain is caused to wash away filling body, shortcoming is excavation project
It measures larger.
For a concrete engineering, which kind of pattern toe board uses, should be according to landform, geology, meteorology, construction team
The factors such as technical merit and mechanization of building operation degree, determine through comprehensive study, using more for flat toe board in engineering.
The research of toe board structure pattern is primarily to determine the width B of toe board and height H.Toe board is as panel and basement rock
Between connection structure, it is necessary to build in it is stable or by the ground that can stablize of processing, with the change for preventing toe board generation larger
Shape slides unstability；To prevent toe board ground from generating erosion under design head effect, it is necessary to which selection is rational to allow waterpower ratio
It drops, and the width of toe board is determined with this.
The design width of toe board is usually determined by the permission hydraulic gradient of toe board and basement rock contact surface, generally by narrower width
Flat toe board be referred to as narrow toe board.When the Anti-erosion stability requirement for undertaking contact surface comprehensively by width, the numerical value of B usually all compares
It is larger.For the rock in Narrow Valleys area, since bank slope is very steep, the foundation excavation quantities of toe board is very big, side slope
Height, supporting amount are big.Under the premise of permission hydraulic gradient is met, to reduce excavation project amount, the knot of Narrow Valleys area toe board
The toe board structure pattern of " narrow toe board+barrier sheet " can be used in structure build, and corresponding Anti-erosion measure is taken (as increased in toe slab downstream
Add barrier sheet or pneumatically placed concrete etc.) extend seepage paths, and with filter protection, the segment length can be reduced, to reduce excavation project amount.
As shown in Figure 1, the width B of narrow toe board 100 meets the requirement of consolidation grouting and Curtain Grouting Construction, in narrow toe board 100
The barrier sheet 200 of downstream side setting one fixed width B ', the bottom surface of barrier sheet 200 are flushed with the bottom surface of narrow toe board 100, narrow toe board
100 and barrier sheet 200 total length meet plinth foundation contact seepage control standard, set between narrow toe board 100 and barrier sheet 200
Copper sheet sealing；Panel 300 is inclined in the downstream end face of narrow toe board 100.
In general, being equipped with an enrockment body region in the downstream side of narrow toe board 100 and 300 connecting portion of panel, it is commonly called as special pad
Layer 500；At the position, the stress state significant of panel 300.If special 500 layered material of bed course deformation is excessive, periphery fissure stops
Water may destroy；Conversely, panel 300 can generate larger stress raisers (inclined slope aspect), the panel 300 near periphery fissure may
Occur squeezing and destroy.《Concrete face rockfill dam design specification》Upper requirement ensures the rockfill needs in 300 starting point of panel
Adequate thickness, i.e., height L of narrow 100 downstream face of toe board perpendicular to 300 bottom surface of panel are not less than 0.9m, and the purpose is to avoid ground
Hard support to panel 300, in order to avoid generate excessive flexural deformation.Therefore, narrow toe board 100 needs to keep certain height,
Height H is generally less than 2m, and the flat toe board of routine of this height will not generally form stable problem.But for Narrow Valleys area
High CFRD for, the barrier sheet 200 in existing narrow 100 downstream of toe board has occupied the thickness of a part of rockfill, in order to
Meet the rockfill thickness requirement of 300 starting point of panel, the height H of narrow toe board 200 increases compared to conventional flat toe board needs, and narrow
The width B of toe board 200 is more compared to conventional flat toe board shortening, therefore the depth-width ratio H/B of narrow toe board 200 is big compared to conventional flat toe board
To increase, under high water head effect, the stability of the narrow toe board 200 of above structure is poor, and toe board upstream is likely to occur tensile stress,
Toe board unstability is caused, destroys the integrality of seepage control of dam system.
Utility model content
The utility model provides a kind of narrow toe board arrangement of high CFRD in Narrow Valleys area, it is intended to solve
Certainly how to reduce the problem of depth-width ratio of narrow toe board is to enhance its stability.
Technical solution is used by the utility model solves its technical problem：The high CFRD in Narrow Valleys area
With narrow toe board arrangement, including narrow toe board, barrier sheet and panel, the narrow toe board is arranged on riverbed basis and two sides basement rock
On, the downstream end face of narrow toe board includes top incline and downside, and the panel is obliquely installed, the lower end of panel and top incline
It links together；Key-wall is further included, the key-wall is arranged on the bottom surface at narrow toe slab downstream end, and the barrier sheet is arranged on key-wall
Downstream side and link together with the downstream end face of key-wall.
Further, the thickness of the barrier sheet is equal with the height of key-wall, and the bottom surface of barrier sheet and the bottom of key-wall
Face flushes, and the top surface of barrier sheet is flushed with the bottom surface of narrow toe board.
Further, it is provided with waterstop at connecting portion between the barrier sheet and key-wall.
Further, the distance between the panel and barrier sheet L are not less than 0.9m.
Further, angle of the upstream face of the key-wall between inclined surface, with narrow toe board bottom surface is obtuse angle；
The downstream end face of key-wall and downside are coplanar.
Further, the downside is vertical plane.
Further, the key-wall is an integral structure with narrow toe board.
Further, the narrow toe board arrangement further includes special bed course, the special bed course be set to panel with it is narrow
The downstream side of toe board connecting portion, and it is provided with loaded filter between special bed course and barrier sheet.
The beneficial effects of the utility model are：By setting key-wall, and pass through key-wall on the bottom surface at narrow toe slab downstream end
It is connect with barrier sheet, effectively reduces the water retaining height of narrow toe board, the depth-width ratio of narrow toe board is relative to used in existing structure
Narrow toe board be obviously reduced, enhance the narrow toe board stability of itself under high water head effect, improve panel end stress, barrier properties
Can be more reliable, the high CFRD especially suitable for Narrow Valleys area；Meanwhile the height of narrow toe board is lower, and can subtract
Few toe board slope excavating amount saves toe board amount of concrete, and construction is easier, and will not be concerned with concrete construction process and disturb.
Description of the drawings
Fig. 1 is the implementation structure diagram of existing narrow toe board arrangement；
Fig. 2 is the implementation structure diagram of the utility model；
In figure label for：Narrow toe board 100, top incline 111, downside 112, barrier sheet 200, panel 300, key-wall 400,
Special bed course 500.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Fig. 2, the narrow toe board arrangement of the high CFRD in Narrow Valleys area, including narrow toe board 100, prevents
Plate 200, panel 300 and key-wall 400 are oozed, the narrow toe board 100 is arranged on riverbed basis and two sides basement rock, narrow toe board 100
Downstream end face includes top incline 111 and downside 112, and panel 300 is obliquely installed, lower end and the top incline 111 of panel 300
It links together；Key-wall 400 is arranged on the bottom surface of narrow 100 downstream of toe board, and barrier sheet 200 is arranged on the downstream of key-wall 400
Side simultaneously links together with the downstream end face of key-wall 400.Such narrow toe board arrangement, by narrow 100 downstream of toe board
Key-wall 400 on bottom surface is set, and passes through key-wall 400 and is connect with barrier sheet 200, effectively reduces the water retaining height of narrow toe board 100,
The depth-width ratio H/B of narrow toe board 100 is obviously reduced relative to the narrow toe board 100 used in existing structure, enhances high water head work
The narrow stability of itself of toe board 100 under, improves 300 end stress of panel, and barrier performance is more reliable.
Wherein, narrow toe board 100 is designed using " Y " line as narrow 100 structure control wire of toe board, and " Y " line is 300 baseplane of panel
Intersect formed line with the top incline 111 of narrow toe board 100；According to more than mentality of designing, it is secondary fixed not need to generally carry out
Line, also not by increasing the width B excavated to obtain narrow toe board 100；The width B of narrow toe board 100 meets consolidation grouting and curtain
The requirement of grouting construction, generally 4m.The height H of narrow toe board 100 is required to meet the following conditions, i.e., panel 300 with
The distance between barrier sheet 200 L is not less than 0.9m；In general, it is set at connecting portion between panel 300 and top incline 111
It is equipped with leakage preventing structure.Top incline 111 is usually perpendicular with panel 300, and downside 112 is preferably vertical plane.
Barrier sheet 200 can extend seepage paths, and its filter protection acts on；Meanwhile barrier sheet 200 can reduce narrow toe board 100
Width, reduce excavation project amount.The width B ' of barrier sheet 200 allows hydraulic gradient requirement to design by satisfaction, can be according to excavation
Geological conditions adjustment afterwards, thus it is very convenient flexible.
Key-wall 400 is mainly used for connecting barrier sheet 200, to reduce the height H of narrow toe board 100；In order to improve key-wall 400
Stability is usually designed to structure shown in Fig. 2, i.e. the upstream face of key-wall 400 is inclined surface, with narrow toe board 100
Angle between bottom surface is obtuse angle；The downstream end face of key-wall 400 and downside 112 are coplanar.It is preferred that by key-wall 400 and narrow toe board
100 settings are an integral structure.
Further preferably, as shown in Fig. 2, the thickness T of barrier sheet 200 is equal with the height of key-wall 400, and barrier sheet 200
Bottom surface is flushed with the bottom surface of key-wall 400, and the top surface of barrier sheet 200 is flushed with the bottom surface of narrow toe board 100.Above structure is more conducive to apply
Work, and anti-seepage effect is more preferable.
Because the main function of barrier sheet 200 is also antiseepage, the quantity and width in crack are reduced so should adopt an effective measure
Degree, it is therefore desirable to which waterstop is set at the connecting portion between barrier sheet 200 and key-wall 400.
Again as shown in Fig. 2, the high CFRD in Narrow Valleys area further includes special pad with narrow toe board arrangement
Layer 500, special bed course 500 is set to the downstream side of panel 300 and narrow 100 connecting portion of toe board, and special bed course 500 and antiseepage
Loaded filter is provided between plate 200.When necessary, also Foundation Consolidation Grouting should be carried out in special bed course 500 and barrier sheet 200.
The narrow toe board arrangement of the high CFRD in Narrow Valleys area provided by the utility model, passes through key-wall
400 can effectively reduce the height of narrow toe board 100, reduce toe board slope excavating amount, save toe board amount of concrete, and construction is simpler
Just, and it will not be concerned with concrete construction process and disturb；In the narrow toe board arrangement depth-width ratio H/B of narrow toe board 100 relative to
Narrow toe board 100 used in existing structure is obviously reduced, and enhances the narrow stability of itself of toe board 100 under high water head effect,
High CFRD especially suitable for Narrow Valleys area.
Claims (8)
1. the narrow toe board arrangement of the high CFRD in Narrow Valleys area, including narrow toe board (100), barrier sheet (200)
With panel (300), the narrow toe board (100) is arranged on riverbed basis and two sides basement rock, the downstream bread of narrow toe board (100)
Top incline (111) and downside (112) are included, the panel (300) is obliquely installed, the lower end of panel (300) and top incline
(111) it links together；It is characterized in that：Key-wall (400) is further included, the key-wall (400) is arranged on narrow toe board (100) downstream
On the bottom surface at end, the barrier sheet (200) is arranged on the downstream side of key-wall (400) and is connect with the downstream end face of key-wall (400)
Together.
2. the narrow toe board arrangement of the high CFRD in Narrow Valleys area as described in claim 1, it is characterised in that：
The thickness of the barrier sheet (200) is equal with the height of key-wall (400), and the bottom surface of barrier sheet (200) and the bottom of key-wall (400)
Face flushes, and the top surface of barrier sheet (200) is flushed with the bottom surface of narrow toe board (100).
3. the narrow toe board arrangement of the high CFRD in Narrow Valleys area as described in claim 1, it is characterised in that：
Waterstop is provided at connecting portion between the barrier sheet (200) and key-wall (400).
4. the narrow toe board arrangement of the high CFRD in Narrow Valleys area as described in claim 1, it is characterised in that：
The distance between the panel (300) and barrier sheet (200) L are not less than 0.9m.
5. the narrow toe board arrangement of the high CFRD in the Narrow Valleys area as described in claim 1,2,3 or 4, special
Sign is：Angle of the upstream face of the key-wall (400) between inclined surface, with narrow toe board (100) bottom surface is obtuse angle；Tooth
The downstream end face of wall (400) and downside (112) are coplanar.
6. the narrow toe board arrangement of the high CFRD in Narrow Valleys area as claimed in claim 5, it is characterised in that：
The downside (112) is vertical plane.
7. the narrow toe board arrangement of the high CFRD in Narrow Valleys area as claimed in claim 5, it is characterised in that：
The key-wall (400) is an integral structure with narrow toe board (100).
8. the narrow toe board arrangement of the high CFRD in the Narrow Valleys area as described in claim 1,2,3 or 4, special
Sign is：Special bed course (500) is further included, the special bed course (500) is set to panel (300) and is connect with narrow toe board (100)
The downstream side at position, and it is provided with loaded filter between special bed course (500) and barrier sheet (200).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721645227.7U CN207537987U (en) | 2017-11-30 | 2017-11-30 | The narrow toe board arrangement of the high CFRD in Narrow Valleys area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721645227.7U CN207537987U (en) | 2017-11-30 | 2017-11-30 | The narrow toe board arrangement of the high CFRD in Narrow Valleys area |
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| Publication Number | Publication Date |
|---|---|
| CN207537987U true CN207537987U (en) | 2018-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721645227.7U Active CN207537987U (en) | 2017-11-30 | 2017-11-30 | The narrow toe board arrangement of the high CFRD in Narrow Valleys area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185006A (en) * | 2019-05-30 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | Narrow Valleys landform high CFRD |
| CN110185005A (en) * | 2019-05-30 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | The narrow toe board structure of Narrow Valleys and construction method |
-
2017
- 2017-11-30 CN CN201721645227.7U patent/CN207537987U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185006A (en) * | 2019-05-30 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | Narrow Valleys landform high CFRD |
| CN110185005A (en) * | 2019-05-30 | 2019-08-30 | 中国葛洲坝集团第一工程有限公司 | The narrow toe board structure of Narrow Valleys and construction method |
| CN110185006B (en) * | 2019-05-30 | 2020-09-15 | 中国电建集团成都勘测设计研究院有限公司 | High face rockfill dam for narrow river valley |
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