CN105297685B - A kind of pedestal CFRD and its construction method - Google Patents

A kind of pedestal CFRD and its construction method Download PDF

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CN105297685B
CN105297685B CN201510817066.4A CN201510817066A CN105297685B CN 105297685 B CN105297685 B CN 105297685B CN 201510817066 A CN201510817066 A CN 201510817066A CN 105297685 B CN105297685 B CN 105297685B
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pedestal
area
rock
panel
cfrd
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CN105297685A (en
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杨家修
湛正刚
程瑞林
张合作
慕洪友
蔡大咏
王蒙
邱焕峰
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Powerchina Guiyang Engineering Corp Ltd
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Powerchina Guiyang Engineering Corp Ltd
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Abstract

The invention discloses a kind of pedestal CFRD and its construction method, belong to hydroelectric project technical field, including rock, panel, bed course area and transition region a, the transition region a, bed course area and panel are covered on the upstream face of rock successively, the rock has pedestal, and transition region b is provided between the pedestal and rock.The technical program under rock by setting pedestal, employ hierarchy, fundamentally reduce the height and panel length of rock rockfill, on the premise of crest elevation is not reduced, reduce the deformation of rock and panel, so that design, build and run higher rock and be more prone to reach technical requirements, by Deformation control in controlled range, breach because high CFRD is larger and limited to not above 250m levels by deformation.

Description

A kind of pedestal CFRD and its construction method
Technical field
The invention belongs to hydroelectric project technical field, it is related to a kind of new dam type for being applicable more than 70m rocks, especially It is to be related to a kind of pedestal CFRD and its construction method.
Background technology
Rock development course is made a general survey of, panel heap is crossed from Tianshengqiao-I rock (height of dam 178m), big vast family The 180m such as masonry dam (height of dam 179.5m) grades is developed into water cloth a strip of land between hills rock (height of dam 233m), and height of dam development maximum span reaches 53m;At present, built highest rock water cloth a strip of land between hills rock operational excellence, illustrate China possessed design, build, The ability of 200m grades of rocks of operation and management.But, several 200m grades of high CFRDs of short-term construction are being obtained While success and invaluable experience, also there is dam deformation bigger than normal than predicted value, panel generation extruding breakage, seepage in part engineering The problems such as measuring larger.If height of dam continues to increase to more than 250m, compared with built highest 233m water cloth a strip of land between hills rock, together Spline span is larger, will bring bigger design and construction difficulty.Therefore, on the basis of current technology, success construction 250m grades or higher of rock, those skilled in the art have no full assurance.
Due to the characteristic of dam material, the deformation during CFRD Embankment with the runtime after retaining is to keep away Exempt from, but deform it is excessive will cause face slab rupture, joint seal destruction so as to increase leakage, or even causes infiltration Stability disruption etc., threatens dam resistance to overturning.In addition, conventional panels rock-fill dams height of dam increase, panel chord length increase, reservoir stores After water level, under effect of water pressure, deck deflection deformation increase, deformation is excessive to cause panel to fracture, and lose panel anti- Ooze function.It was verified that in the case that identical material source, level are matched somebody with somebody and fill index, height of dam is higher, panel chord length is longer, and dam body becomes Shape and deck deflection deformation are bigger.Existing result of study shows that it is exactly face to limit one of key technology of rock height of dam The Deformation control of plate and dam body stockpile.
The content of the invention
In order to solve the above problems, the invention provides a kind of pedestal CFRD and its construction method, from And reduction dam body rockfill height is reached, reduce panel chord length, so as to reduce the effect of dam deformation value, make deformation controllable Within the scope of, upper panel rock-fill dams is highly met design, construction, operation, the administrative skill level of current rock.
The present invention is achieved by following technical solution.
A kind of pedestal CFRD, including rock, panel, bed course area and transition region a, the transition Area a, bed course area and panel are covered on the upstream face of rock successively, and the rock has pedestal, described Transition region b is provided between pedestal and rock.
The pedestal includes the pedestal antiseepage area of upstream side and the pedestal supporting region in downstream.
The pedestal antiseepage area is provided with toe board area at the top of pedestal.
Pedestal irrigation gallery is provided with inside the pedestal antiseepage area.
Seepage proof curtain is provided with below the pedestal antiseepage area.
Pedestal antiseepage area transverse joint is provided with the pedestal antiseepage area.
The panel is provided with panel vertical lap seam.
The rock two ends are provided with toe board.
A kind of construction method of pedestal CFRD, comprises the following steps:
A. pedestal is poured:Dam foundation coating is removed, dam foundation excavation to bearing capacity is met to desired depth, region is being excavated Interior system peace reinforcing bar, presets seepage proof curtain under pedestal antiseepage area, reserves pedestal irrigation gallery, and jump pours pedestal concrete soon, together When take Temperature Control Measures, prevent crack;Pedestal supporting region then determines on-deck size according to material property, and takes temperature Spend control measure;
B. pedestal Anti-seeping technology:Anti-seeping technology is carried out to pedestal antiseepage area and pedestal supporting region interface, in pedestal antiseepage Area sets pedestal antiseepage area transverse joint, and the position of pedestal antiseepage area transverse joint is corresponding with the position of panel vertical lap seam;
C. pedestal joint face is handled:Fill Transition Materials at the top of pedestal, form transition region b, transition region b filling material and Indices are identical with transition region a;
D. CFRD Embankment:Rock, transition region a, bed course area, panel are filled successively, are set on panel Panel vertical lap seam, is corresponded with pedestal antiseepage area transverse joint position, completes construction.
In the step a, when pedestal antiseepage area is poured, upstream 1~5m of thickness is reserved, is together poured with toe board area at the top of pedestal Build, and carry out the concreting of bank slope toe board simultaneously.
The beneficial effects of the invention are as follows:
A kind of pedestal CFRD of the present invention and its construction method, by being divided into rock Pedestal is put, its effect is:1. hierarchy is employed, the height and panel of rock rockfill is fundamentally reduced Length, on the premise of crest elevation is not reduced, reduces the deformation of rock and panel so that design, build and transport The higher rock of row is more prone to reach technical requirements, by Deformation control in controlled range, breaches because high face Sheetpile masonry dam is limited to by deforming larger not above 250m levels;2. first construction is finished before rock construction, is completed Can dash pass the flood period, it is to avoid the destruction that flood season bed course temporary water dash may be caused to dam body temporary section, shorten bed course prevent temporarily The time of shield, the maintenance cost of bed course provisional protection is reduced, while also reducing the investment to construction diversion.
Brief description of the drawings
Fig. 1 is structural representation of the invention;
Fig. 2 is the partial enlarged drawing at A in the present invention;
Fig. 3 is the elevation of pedestal upstream face in the present invention.
In figure:1- pedestals, 2- rocks, 3- panels, 4- bed courses area, 5- transition regions a, 6- transition region b, 7- pedestal is held Carry toe board area, 10- pedestal antiseepages area transverse joint, 11- pedestal irrigation galleries, 12- antiseepages at the top of area, 8- pedestal antiseepages area, 9- pedestals Curtain, 13- toe boards, 14- panel vertical lap seams.
Embodiment
Technical scheme is further described below in conjunction with the accompanying drawings, but claimed scope is not limited to institute State.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of pedestal CFRD of the present invention, including rock 2nd, panel 3, bed course area 4 and transition region a5, the transition region a5, bed course area 4 and panel 3 are covered in rock 2 successively On upstream face, the rock 2 has pedestal 1, and transition region b6 is provided between the pedestal 1 and rock 2, makees To fill Transition Materials.
The pedestal 1 includes the pedestal antiseepage area 8 of upstream side and the pedestal supporting region 7 in downstream, and the height of pedestal 1 is less than 100m, pedestal supporting region 7 can be in the rigid materials such as normal concrete, grinding coagulation soil, cement sand and gravel, rock-fill concrete One or more of batch mixings are built up, and its rigidity is suitable with the dam foundation after building up;Pedestal antiseepage area 8 is built up by normal concrete;The base Seat antiseepage area 8 is provided with toe board area 9 at the top of pedestal, and inside is provided with pedestal irrigation gallery 11, and lower section is provided with seepage proof curtain 12, to many Individual position carries out antiseepage, reaches good anti-seepage effect.
The panel 3 is provided with panel vertical lap seam 14 so that panel 3 can bear certain deflection;The pedestal antiseepage Some pedestal antiseepage area transverse joints 10 are provided with along river vertical direction in area 8, position and the panel of each pedestal antiseepage area transverse joint 10 hang down Vertical masonry joint 14 is corresponding, and Copper water stop is set in seam.
The rock 2 is conventional rock, and rock 2 and panel 3, bed course 4, transition region a5 are equal Based on pedestal 1, and length of the upper surface along river course direction of pedestal 1 is more than the bottom surface of rock 2 along river course direction Length, the step surface that the upstream side of pedestal 1 extends out, i.e., the top of pedestal antiseepage area 8 is provided with toe board area 9, pedestal top at the top of pedestal Wide 8~the 15m in toe board area of portion 9,1~2m of thickness, using more than C30 concretings;The two ends of pedestal 1 are then provided with toe board 13, toe board knot Structure can avoid rock 2 and the crossover position of pedestal 1 that seepage is occurred by current scour.
The pedestal 1 along the river to length L add 2.9 for 15~100m~3.2 times of H, wherein H is rock 2 Highly;Pedestal 1 respectively upstream with downstream slope, slope ratio determines according to actual conditions.
During construction, following steps are taken:
A. pedestal is poured:Dam foundation coating is removed, dam foundation excavation to bearing capacity is met to desired depth, region is being excavated Interior system peace reinforcing bar, determines the position of pedestal antiseepage area 8, default seepage proof curtain 12, then pours pedestal coagulation under pedestal antiseepage area 8 Soil, reserves pedestal irrigation gallery 11 when pouring.When pouring, pedestal supporting region 7 can be first poured, also can pedestal antiseepage area 8 and pedestal Supporting region 7 pours rising simultaneously, and carries out Anti-seeping technology to pedestal antiseepage area 8 and the interface of pedestal supporting region 7;Pedestal antiseepage area 8 when pouring, and is jumped and poured soon using C20 or more than C20 normal concretes, while taking Temperature Control Measures, prevents crack; Reserved upstream 1~5m of thickness, is together poured with toe board area 9 at the top of pedestal, and the progress bank slope toe board 13 while pedestal 1 is poured Concreting, and corresponding based process;Pouring for pedestal supporting region 7, on-deck size is determined according to material property, it is ensured that The intensity of rock is reached, and takes when pouring suitable Temperature Control Measures.
B. pedestal Anti-seeping technology:Anti-seeping technology is carried out to pedestal antiseepage area 8 and the interface of pedestal supporting region 7, it is anti-in pedestal Ooze area 8 and set pedestal antiseepage area transverse joint 10, the position of pedestal antiseepage area transverse joint 10 is corresponding with the design attitude of panel vertical lap seam 14.
C. pedestal joint face is handled:Transition Materials are filled at the top of pedestal 1, transition region b6 are formed, transition region b6's fills material Material and indices are identical with transition region a5 design objective, and filling-up thickness is then determined according to actual conditions;
D. CFRD Embankment:Rock 2, transition region a5, bed course area 4, panel 3 are filled successively, on panel 3 Panel vertical lap seam 14 is set, corresponded with the position of pedestal antiseepage area transverse joint 10, the construction of panel 3 can by stages be applied according to height of dam Work, realizes that impoundment ahead generates electricity.

Claims (4)

1. a kind of construction method of pedestal CFRD, the pedestal CFRD includes panel enrockment Dam (2), panel (3), bed course area (4) and transition region a (5), the transition region a (5), bed course area (4) and panel (3) are covered successively In on the upstream face of rock (2), the rock (2) has pedestal (1), and the pedestal (1) includes upstream The pedestal antiseepage area (8) of side and the pedestal supporting region (7) in downstream;Pedestal antiseepage area (8) is provided with toe board area at the top of pedestal (9), lower section is provided with seepage proof curtain (12), and inside is provided with pedestal irrigation gallery (11) and pedestal antiseepage area transverse joint (10);Pedestal (1) Transition region b (6) is provided between rock (2);
It is characterized in that:The construction method of the pedestal CFRD comprises the following steps:
A. pedestal is poured:Dam foundation coating is removed, dam foundation excavation to bearing capacity is met to desired depth, is made excavating in region Pacify reinforcing bar, seepage proof curtain (12) is preset under pedestal antiseepage area (8), reserve pedestal irrigation gallery (11), jump pours pedestal and mixed soon Solidifying soil, while taking Temperature Control Measures, prevents crack;Pouring for pedestal supporting region (7), is determined according to material property On-deck size, and take Temperature Control Measures when pouring;
B. pedestal Anti-seeping technology:Anti-seeping technology is carried out to pedestal antiseepage area (8) and pedestal supporting region (7) interface, it is anti-in pedestal Ooze area (8) and set pedestal antiseepage area transverse joint (10), the position of pedestal antiseepage area transverse joint (10) and the position phase of panel vertical lap seam (14) Correspondence;
C. pedestal joint face is handled:Transition Materials are filled at the top of the pedestal (1), form transition region b (6), transition region b (6) are filled Material and indices are identical with transition region a (5);
D. CFRD Embankment:Rock (2), transition region a (5), bed course area (4), panel (3) are filled successively, in face Panel vertical lap seam (14) is set on plate (3), corresponded with pedestal antiseepage area transverse joint (10) position, construction is completed.
2. a kind of construction method of pedestal CFRD according to claim 1, it is characterised in that:The step In rapid a, when pedestal antiseepage area (8) is poured, upstream 1~5m of thickness is reserved, is together poured with toe board area (9) at the top of pedestal, and together The concreting of Shi Jinhang bank slopes toe board (13).
3. a kind of construction method of pedestal CFRD according to claim 1, it is characterised in that:The face Plate (3) is provided with panel vertical lap seam (14).
4. a kind of construction method of pedestal CFRD according to claim 1, it is characterised in that:The face Sheetpile masonry dam (2) two ends are provided with toe board (13).
CN201510817066.4A 2015-11-23 2015-11-23 A kind of pedestal CFRD and its construction method Active CN105297685B (en)

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CN105672205B (en) * 2016-03-29 2018-02-09 中国电建集团中南勘测设计研究院有限公司 A kind of rock leakage preventing structure
CN106192907B (en) * 2016-07-11 2018-06-22 中国水利水电第十一工程局有限公司 Add the construction method of 150m~300m grade high concrete panel rock-fill dams of cement sand and gravel structure sheaf
CN106087880B (en) * 2016-07-19 2018-10-19 中国水利水电第十一工程局有限公司 A kind of dam that 300 meter level is high and its construction technology
CN106638487B (en) * 2017-01-19 2019-10-25 中国电力建设股份有限公司 A kind of construction method combining checkdam and the combined dam

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GB715126A (en) * 1950-07-27 1954-09-08 Wilhelm Degen Water-tight seals for dams, etc
CN103132488B (en) * 2011-11-25 2015-04-15 中国电建集团贵阳勘测设计研究院有限公司 Reverse osmosis water processing method and reverse osmosis drainage system in construction period of concrete faced rockfill dam
CN102900092B (en) * 2012-09-24 2015-02-11 长江勘测规划设计研究有限责任公司 Artificial composite foundation of concrete face rockfill dam built on deep and thick coverage layer and construction method of artificial composite foundation
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