CN102071668B - Dam grout stopping body and arranging method thereof - Google Patents
Dam grout stopping body and arranging method thereof Download PDFInfo
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- CN102071668B CN102071668B CN2011100473406A CN201110047340A CN102071668B CN 102071668 B CN102071668 B CN 102071668B CN 2011100473406 A CN2011100473406 A CN 2011100473406A CN 201110047340 A CN201110047340 A CN 201110047340A CN 102071668 B CN102071668 B CN 102071668B
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- grout stopping
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Abstract
The invention relates to the field of concrete dam construction and discloses a grout stopping body. The grout stopping body comprises a trapezoid concrete structure, the bottom surface of the trapezoid concrete structure is provided with steel bars and inserted reinforcements, and the grout stopping body is characterized in that the top surface of the concrete structure is provided with an axial groove. The invention also discloses a method for arranging the grout stopping body. One grout stopping body is added in the traditional mounting method, thus ensuring a curtain grouting region to be independent with a surface grouting region. By adopting the grout stopping body in the invention, construction difficulty is reduced and construction progress is sped up, thus being beneficial to vibrating and densifying concrete and improving the quality of the concrete of the grout stopping body. In the method for arranging the grout stopping body in the invention, the curtain grouting region is separated from the surface grouting region, curtain grouting construction is not restricted by surface grouting construction, and the curtain grouting is firstly carried out, thus having significance for shortening construction period and being beneficial to improving the construction quality of surface grouting.
Description
Technical field
The present invention relates to the concrete dam construction field.
Background technology
In the concrete dam construction, contact grouting is carried out in the slit between dam and the two sides rock slope, and the dam batholith is carried out curtain grouting is the important operation of twice in the dam construction, its construction quality is related to the stability and security of dam.
Need before the Dam Construction basis is excavated, as shown in Figure 1, original place upper thread 1 is excavated to slightly weathered rock, form Dam Base Surface, on foundation plane, build concrete dam 2 then.Dam concrete because of the hydrated cementitious heat release in the early stage the time temperature raise, the dam temperature drops to equilibrium temperature subsequently.Dam its volume of when cooling shrinks, and causes the slit between the batholith that itself and abrupt slope locate to be drawn back.Need locate the slit to the abrupt slope in the engineering construction and carry out the contact grouting processing, to avoid the phenomenon of storehouse water seepage around the dam, be that example describes with contact grouting seam face 3 among Fig. 1, and other place, abrupt slope gap processing method is identical.Processing method is: like Fig. 2, before concrete dam is built, on rock face, bury contact grouting pipe-line system 4 underground, after contact grouting seam face 3 is drawn back, carry out cement grouting shutoff seam face, reach the effect of closely knit sealing.The mouth of pipe of contact grouting pipe-line system 4 causes gallery, carries out contact grouting after design load, contact grouting seam face 3 are drawn back and handles so that reach in dam body cooling.
Dam Construction needs that batholith is carried out antiseepage and handles, and the grouted cut off wall barrier technology is generally adopted in engineering construction.Like Fig. 1, shown in Figure 2; Dam foundation seepage proof curtain 5 is located at the upstream side of Dam Base Surface; Adopt geological drilling rig make deep hole (usually the about 100mm in aperture, the about 1500mm ~ 3000mm of pitch-row, hole depth be generally the storehouse head 2/3rds, the hole is one in the plane and arranges or two arranged); Adopt high pressure cement injection sizing process; Consolidation process is filled in crack in the dam batholith, and the pressure injection cement paste has certain infiltration range of scatter in batholith, thereby forms certain thickness fluid-tight relatively curtain together at the upstream side of dam foundation.This waterproof relatively curtain reduction storehouse water osmotic pressure is greatly stablized to guarantee the dam overturning or slip resistance analysis the uplift pressure of dam foundation generation.
If opposite joint face 3 is not handled, stitch 3 upstream and downstream that can be communicated with dam body of face so, in engineering practice; For guaranteeing the quality of seam face contact grouting; Need to be provided with and end paste structure, as shown in Figure 2, end the closed area that slurry 6 ~ 9 forms certain area; Effluent goes out outside the dam in order to avoid cement grout is from upstream and downstream, and the closed area can form internal pressure to improve grouting quality at the seam face.
In present design and job practices, concrete dam seepage proof curtain and dam abutment contact grouting end paste structure such as Fig. 3 institute
Show, existing ending in the slurry, trapezoidal concrete structure 10 is through joint bar 11 and basement rock anchoring; Be inserted with metal grout stop plate 12 on the trapezoidal concrete structure 10; During the concreting dam, metal grout stop plate 12 links to each other with dam concrete, when concrete dam is contracted to the slit and opens; Metal grout stop plate 12 can be stretched and do not broken, thereby forms the seam face chamber of a sealing.Should end paste structure and in construction, have following defective:
(1) in the time of will inserting the template installation fee in the 12 feasible constructions of metal grout stop plate in the centre of trapezoidal concrete structure 10, influences construction speed;
(2) because the size of trapezoidal concrete structure 10 is little; In original narrow space, insert metal grout stop plate 12 again; Make and end the concrete vibrating difficulty of slurry own that cause trapezoidal concrete structure 10 to be prone to take place quality defect of concrete such as honeycomb, pitted skin, influence ends slurry, stagnant water effect.
In present design and job practices, end slurry on layout as
It is shown in Figure 2,There is following defective in this layout:
Contact grouting and curtain grouting have been comprised in (1) closed area.So arrange; In construction, must carry out earlier carrying out curtain grouting after the contact grouting, otherwise the slurries entering contact grouting face and the pipe-line system of curtain grouting then can take place like sequence of construction; Contact grouting is taken place in advance; Its grouting system also has been full of cement grout, and cement grout sclerosis back pipeline is blocked, and has lost the function of being in the milk again.As this moment the dam body internal temperature do not reach the words of the rated condition of contact grouting; Dam also will continue to take place cooling and shrink; Seam face between dam body and the two sides basement rock also opens continuing, because joint grouting this moment system blocks, the seam face of this moment can't pour into.
(2) contact grouting construction operation weak point consuming time; But it reaches the chronic of the primary condition that allows the beginning construction operation; Only drop to and just can carry out after certain value reaches requirement with seam face opening width, often need wait for long time and will reach above-mentioned primary condition at the dam body internal temperature.And big, the construction operation length consuming time of the workload of curtain grouting in the engineering; Execution conditions are not stitched the restriction of face opening width and dam body internal temperature; As long as the concrete cladding thickness reaches more than the 2m and can construct, but, can't let curtain grouting carry out early because the structural configuration of Fig. 2 can only carry out earlier carrying out curtain grouting after the contact grouting; A large amount of durations pass in wait, to engineering retaining early operation generating deleterious impact.
Summary of the invention
The deficiency that the present invention is directed to prior art provide a kind of easy construction, quality high end slurry.
The present invention also provides a kind of method for arranging that ends slurry.
A kind of slurry that ends of the present invention comprises trapezoidal concrete structure, and the bottom surface of trapezoidal concrete structure is provided with the reinforcing bar joint bar, it is characterized in that: the end face of trapezoidal concrete structure is provided with axial groove.
Further, the end face of trapezoidal concrete structure and two sides all are coated with and are brushed with bitumen layer.
The above-mentioned a kind of method for arranging that ends slurry, on the plane, abrupt slope of dam, upstream side is provided with first and ends slurry; The top is provided with second and ends slurry, and the downstream is provided with the 3rd and ends slurry, and the bottom is provided with the 4th and ends slurry; All end slurry all through reinforcing bar joint bar and basement rock anchoring; First ends slurry, second ends slurry, the 3rd and ends slurry and the 4th and end slurry and surround the closed area, it is characterized in that: comprise that also being located at first ends slurry and the 3rd and end the 5th between the slurry and end slurry, the 5th end slurry two ends be connected to second respectively and end only slurry of slurry and the 4th; Thereby form two closed areas; Upstream side is the curtain grouting district, and the downstream is the contact grouting district, in the groove of the end face that respectively ends slurry, is provided with hydro-expansive rubber.
The new structure form that ends slurry that the invention provides a kind of concrete dam curtain grouting and contact grouting with and method for arranging.The new structure form that the present invention ends slurry has the construction of being prone to and the measured advantage of matter; The new method for arranging that the present invention ends slurry has the advantage of construction contact grouting after the curtain grouting of can constructing earlier, can shorten the straight line duration of engineering construction greatly, realizes the engineering generating of going into operation in advance, has remarkable technology, economic and social benefit.
Advantage of ending the new structure form of slurry of the present invention has:
(1) the structure setting of filling hydro-expansive rubber has replaced insertion metal grout stop plate in trapezoidal concrete structure in the groove; Template when helping trapezoidal concrete structure construction is installed; Reduce difficulty of construction and accelerated construction speed; It is closely knit to be beneficial to concrete vibrating, has improved the concrete quality that ends slurry;
(2) only the outside of the trapezoidal concrete structure of slurry is coated with and is brushed with bitumen layer; Disengagement forms the seam face at the bitumen layer place with ending slurry to help dam body; Only make when avoiding dam to shrink slurry extract the reinforcing bar joint bar and become seam face with batholith emaciated face open form, only making, slurry loses only slurry effect.
Advantage of ending the new method for arranging of slurry of the present invention has:
(1) curtain grouting district and contact grouting district separate, and the curtain grouting construction need not to receive the restriction of back in the contact grouting construction, and curtain grouting is constructed significant to shortening the engineering construction straight line duration in advance;
(2) contact grouting can be delayed and carry out, and can reduce and the seam face opens the time that provides more sufficient for the dam body temperature like this, helps improving the construction quality of contact grouting.
Description of drawings
Fig. 1 is a dam vertical section sketch map;
Fig. 2 is that existing contact grouting ends slurry layout sketch map;
Fig. 3 is I among Fig. 2-I generalized section;
Fig. 4 is that the slurry that ends of the present invention is arranged sketch map;
Fig. 5 is II among Fig. 4-II generalized section;
Fig. 6 is a kind of sketch map that ends slurry of the present invention.
Among the figure, 1: the original place upper thread; 2: dam; 3: contact grouting seam face; 4 contact grouting pipe-line systems; 5: seepage proof curtain; End slurry at 6: the first; End slurry at 7: the second; Ended slurry in 8: the three; Ended slurry in 9: the four; 10: trapezoidal concrete structure; 11: the reinforcing bar joint bar; 12: the metal grout stop plate; 13: dam body; 14: the curtain grouting district; 15: the contact grouting district; 16: groove; 17: hydro-expansive rubber; 18: bitumen layer.
The specific embodiment
As shown in Figure 6, a kind of concrete structure that ends slurry, by size among the figure with vertically make set shaped steel formwork and be used to build only slurry concrete structure 10 by every 1.5m merogenesis, (be generally 2 ~ 3d the length of time) got final product stripping when concrete reached certain intensity; End trapezoidal concrete structure 10 overall dimensions of slurry: high A=400mm, last bottom width B=300mm, following bottom width C=500mm; End dimension width D=30mm, the degree of depth E=25mm of slurry intermediate groove 16; Ending slurry length requires to decide according to the division of on-the-spot zone; End face and two sides brushing 2 ~ 3 road pitches at the trapezoidal concrete structure 10 that ends slurry form the thick bitumen layer 18 of 2 ~ 3mm.
As shown in Figure 5, be embedded in width 30mm and thickness is the hydro-expansive rubber 17 of 50mm at groove 16, it is thick that hydro-expansive rubber embeds in the groove 25mm, and it is thick to expose 25mm.
The layout plan of slurry till Fig. 4, on the plane, abrupt slope of dam, upstream side is provided with first and ends slurry 6; The top is provided with second and ends slurry 7, and the downstream is provided with the 3rd and ends slurry 8, and the bottom is provided with the 4th and ends slurry 9; All end slurry all through reinforcing bar joint bar 11 and basement rock anchoring; First ends slurry 6, second ends slurry the 7, the 3rd and ends slurry 8 and the 4th and end slurry 9 and surround the closed area, comprises that also being located at first ends slurry 6 and the 3rd and end the 5th between the slurry 8 and end two ends that slurry 13, the five ends slurry 13 and be connected to second respectively and end only slurry 9 of slurry 7 and the 4th; Thereby form two closed areas; Upstream side is curtain grouting district 14, and the downstream is contact grouting district 15, in the groove 16 of the end face that respectively ends slurry, is provided with hydro-expansive rubber 17.As shown in Figure 4, first ends the spacing G=4000mm that slurry 6 and the 5th ends slurry 13 in the curtain grouting district 14, and the hole center line distance the 5th of seepage proof curtain 5 ends the spacing F=600mm ~ 800mm of slurry 13.The dam dam concrete can carry out the curtain grouting construction when covering bedrock thickness greater than 2m, it is constructed before contact grouting.Lay contact grouting pipe-line system 4 according to code requirement in the contact grouting district 15, can arrange construction in good time, generally be arranged in nearest low temperature season before the reservoir filling according to dam body temperature and seam face opening width situation.
In the new method for arranging of only slurry of the present invention; The hydro-expansive rubber 17 that adopts when dam concrete construction because the moisture in the concrete is limited; This moment, (reaching 40% approximately) all do not take place in the swell increment of hydro-expansive rubber 17; When are in the milk in curtain grouting district 14 or contact grouting district 15, hydro-expansive rubber 17 remaining about 60% swell incremenies will continue to produce, thereby can guarantee to form the grouting zone of sealing.
Claims (1)
1. method for arranging that ends slurry, the said slurry that ends comprises trapezoidal concrete structure (10), and the bottom surface of trapezoidal concrete structure (10) is provided with reinforcing bar joint bar (11), and the end face of trapezoidal concrete structure (10) is provided with axial groove (16); The end face of trapezoidal concrete structure (10) and two sides all are coated with and are brushed with bitumen layer (18); It is characterized in that:
Plane, abrupt slope at dam; Upstream side is provided with first and ends slurry (6); The top is provided with second and ends slurry (7), and the downstream is provided with the 3rd and ends slurry (8), and the bottom is provided with the 4th and ends slurry (9); All end slurry all through reinforcing bar joint bar (11) and basement rock anchoring; First ends slurry (6), second ends slurry (7), the 3rd and ends slurry (8) and the 4th and end slurry (9) and surround the closed area, it is characterized in that: comprise that also being located at first ends slurry (6) and the 3rd and end the 5th between the slurry (8) and end slurry (13), the 5th end slurry (13) two ends be connected to second respectively and end only slurry (9) of slurry (7) and the 4th; Thereby form two closed areas; Upstream side is curtain grouting district (14), and the downstream is contact grouting district (15), in the groove (16) of the end face that respectively ends slurry, is provided with hydro-expansive rubber (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100473406A CN102071668B (en) | 2011-02-28 | 2011-02-28 | Dam grout stopping body and arranging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100473406A CN102071668B (en) | 2011-02-28 | 2011-02-28 | Dam grout stopping body and arranging method thereof |
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| Publication Number | Publication Date |
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| CN102071668A CN102071668A (en) | 2011-05-25 |
| CN102071668B true CN102071668B (en) | 2012-05-09 |
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| CN2011100473406A Expired - Fee Related CN102071668B (en) | 2011-02-28 | 2011-02-28 | Dam grout stopping body and arranging method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526759B (en) * | 2013-10-26 | 2015-07-08 | 葛洲坝集团第一工程有限公司 | Concrete faced rockfill dam water stop mortar bed construction trolley |
| CN107366259B (en) * | 2017-09-08 | 2022-07-01 | 中国电建集团中南勘测设计研究院有限公司 | Concrete dam and contact grouting grout stop dam structure thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4655638A (en) * | 1986-06-12 | 1987-04-07 | Gelco Grouting Service | Waterstop for monolith joints and method |
| JPS6363828A (en) * | 1986-09-03 | 1988-03-22 | Three Bond Co Ltd | Water-proof junction for concrete structure |
| RU1772306C (en) * | 1991-01-08 | 1992-10-30 | Всесоюзный научно-исследовательский институт гидротехники им.Б.Е.Веденеева | Method for construction of river embankment on weak ground |
| JPH09100523A (en) * | 1995-10-09 | 1997-04-15 | Maeda Corp | Blockade method of caisson joint in existing breakwater |
| CN1487146A (en) * | 2003-07-11 | 2004-04-07 | 姜建华 | Gravity dam of reinforced concrete |
| CN201512771U (en) * | 2009-09-24 | 2010-06-23 | 中国水电顾问集团华东勘测设计研究院 | Water stopping structure of bank slope of rock mass |
| CN101781885A (en) * | 2010-03-12 | 2010-07-21 | 中国水电顾问集团中南勘测设计研究院 | Composite rubber water stop tape and slope sticking type water stop structure |
| CN101949293B (en) * | 2010-10-09 | 2012-11-14 | 中国水电顾问集团成都勘测设计研究院 | Periphery water stop structure of tunnel plug and setting method thereof |
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2011
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