CN1125904C - Flexible arch for roling concrete on soft foundation - Google Patents
Flexible arch for roling concrete on soft foundation Download PDFInfo
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- CN1125904C CN1125904C CN 01130892 CN01130892A CN1125904C CN 1125904 C CN1125904 C CN 1125904C CN 01130892 CN01130892 CN 01130892 CN 01130892 A CN01130892 A CN 01130892A CN 1125904 C CN1125904 C CN 1125904C
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- dam
- arch
- flexible material
- material strip
- upstream
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- 239000004567 concrete Substances 0.000 title claims description 24
- 239000000463 material Substances 0.000 claims abstract description 44
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 10
- 238000005452 bending Methods 0.000 claims description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 11
- 239000011382 roller-compacted concrete Substances 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract 3
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- 230000036760 body temperature Effects 0.000 description 5
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- 229910021532 Calcite Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- UPLPHRJJTCUQAY-WIRWPRASSA-N 2,3-thioepoxy madol Chemical compound C([C@@H]1CC2)[C@@H]3S[C@@H]3C[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@](C)(O)[C@@]2(C)CC1 UPLPHRJJTCUQAY-WIRWPRASSA-N 0.000 description 1
- 241000700608 Sagitta Species 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
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- 230000008719 thickening Effects 0.000 description 1
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Abstract
The present invention belongs to the technical field of hydraulic engineering, which comprises the steps that flexible material belts are arranged on a horizontal arch ring, tensile regions of a left upstream dam shoulder and a right upstream dam shoulder and a tensile region of a downstream arch crown, and the positions of the flexible material belts of the downstream arch crown and the tensile regions of the left dam shoulder and the right dam shoulder, which are 30cm to 40cm away from an upstream dam surface, are respectively provided with water seals; the end points of the flexible material belts of the tensile regions of the left dam shoulder and the right dam shoulder are provided with anti-cracking channel steel, and the end of the flexible material belt of the downstream arch crown is also provided with anti-cracking channel steel; in the upright surface of an arch dam, flexible material belts are continuously arranged in the positions which are away from a base seat of the arch dam (the height of more than 1/5 dam) upwards along main plane arch action regions of the left dam shoulder and the right dam shoulder, and the bottom of each flexible material belt is provided with anti-cracking channel steel. The present invention saves engineering work loads, and the stress of the arch dam, which is caused by large deformation, can be greatly improved. A rolled concrete arch dam with few engineering work loads is built, and the construction speed is greatly increased. The temperature rise and the temperature difference between the inner part and the outer part can be reduced, the cracks of a dam body are reduced, and the quality of the dam body is ensured.
Description
Technical field
The invention belongs to the hydraulic engineering technical field, particularly grinding concrete dam technology
Prior art:
China needs high-quality, develops the great Northwest water resource at a high speed, economically, therefore need in a large number under high and cold, mud calcite cementation conglomerate condition, to carry out engineering construction, grinding concrete dam technology is to adopt harsh concrete and rolling method to build concrete dam, compare with the conventional concrete mode of building a dam, it is few to have cement consumption, corresponding heat of hydration temperature rise is few, temperature control is simplified, and does not wait for the big storehouse face continuous quick construction of surface radiating, accelerates the concrete dam construction speed greatly.Because the interlayer defective appears in roller compacted concrete easily, gravity dam often adopts the way that adds heavy gauge and strengthen engineering quantity to guarantee its stability and safety.Usually it is shallow and on basement rock is functional (water permeability is little etc. for good integrity, sufficient intensity) the rigid foundation to build the desirable dam site condition of arch dam and be the weak weathered layer in river valley narrower (depth-width ratio is 1: 5).On the weak basis of extremely frigid zones (as the Northwests such as Chinese Xinjiang), can adopt thick arch dam (thickness high ratio＞0.35), strengthen basic supporting capacity first, second the hydraulic pressure load is more is shared by beam, arch and abut thrust have been reduced, adopt thick arch dam also to increase batholith excavation and dam concrete engineering quantity (about 1/3 ~ 2/5), corresponding increase construction intensity, equipment or prolongation duration, increase dynamic investment.But building the especially thin arch dam of arch dam on the weak basis of extremely frigid zones easily makes temperature deformation excessive, abut is subjected to the water pressure displacement excessive, stress raisers worsen (extend to form arch crown upstream face pressure as the drawing crack of arch crown downstream and cross havoc etc.) so that cause dam body to destroy, technical difficulty is big, therefore seldom builds the high arch dam of thin fast, economical both at home and abroad under this condition.
Summary of the invention
The objective of the invention is for overcoming the deficiency of above-mentioned thick arch dam and arch dam, on the basis that takes into full account arch dam displacement properties on the soft foundation, propose a kind of flexible arch for roling concrete on soft foundation structure.Establish flexible material strip at upstream dam abutment and downstream arch crown vertical tension direction, then pulling force reduces greatly, and the pulling force distortion concentrates on flexible material strip, and tensile stress is reduced to allowed band in the concrete, thereby significantly reduces integrated stress.Not only save engineering quantity, improve the Arch Dam Stress that large deformation causes greatly, and build the less rolled concrete arch dam of engineering quantity and accelerate speed of application greatly, also can reduce temperature rise and internal-external temperature difference, reduce the dam body crack, guarantee the dam body quality.
The present invention proposes a kind of flexible arch for roling concrete on soft foundation structure.It is characterized in that, be included on the horizontal arch ring that the left and right sides, upstream dam abutment tensile region and downstream arch crown tensile region are established flexible material strip, the tensile region flexible material strip radical length ab of downstream arch crown and upstream dam abutment tensile region flexible material strip radical length a
1b
1About 1～2 meter, upstream dam abutment tensile region flexible material strip bending length b
1C is 1～2 meter and and a radially
1b
1Angle 30～60 degree; The flexible band of downstream arch crown and left and right sides dam abutment is established sealing respectively from the about 30～40cm of upstream dam facing place, the flexible band edge point channel-section steel crack arrest of left and right sides dam abutment, and arch crown flexible band edge in downstream is also established the crack arrest channel-section steel; On the arch dam facade, highly flexible material strip is set continuously from about height of dam 1/5 more than the arch dam pedestal toward arching action district, the main plane of dam abutment, the left and right sides, upper edge, channel-section steel crack arrest is also established in this flexible material strip bottom.
Dam crest is the vertical cantilever that can have transverse joint to isolate in the scope in 1: 0.6～1: 0.8 in depth-width ratio.Can establish grouting system around the flexible material strip.Said flexible material strip can adopt modulus of elasticity at the material of 300-500MPa such as timber, plastics, pitch etc.
Effect of the present invention and effect:
The present invention establishes the thin layer flexible material at the arch dam tensile region, makes plane arch trace freely extend or change curvature (adding deep camber) and does not cause that stress sharply worsens, and also the displacement of stringcourse is poor about the minimizing, has reduced beam to tensile stress.Therefore can reduce arch dam rigidity with the present invention, make it be easy to adapt to weak basis and go up the plane arch tension distortion that abut displacement that arch dam strengthens and runtime temperature drop bring under hydraulic action, these tensile region tension distortion are concentrated on (low-elasticity-modulus) flexible material strip, reduce the arch dam tensile stress greatly to permissible value, the present invention also can establish crack arrester up to the effect that prevents fracture extension at the Zona transformans end.
Arch dam abut under hydraulic action strengthens with the both sides displacement downstream on the soft rock basis, arch crown curvature reduces, make dam abutment upstream and arch crown downstream face destructive tensile region all occur, construction period and runtime dam body temperature drop are easily with the drawing crack of arch abutment concrete, except that burying standby contact grouting underground at dam abutment in case the temperature drop drawing crack, can establish flexible material strip at upstream dam abutment and downstream arch crown vertical tension direction, then pulling force reduces greatly, the pulling force distortion concentrates on flexible material strip, and tensile stress is reduced to allowed band in the concrete.
Calculate with engineering practice and show that all material deformation is mainly born by the low-elasticity-modulus section, thereby significantly reduces integrated stress when the distortion of structure pulling force is shared by different bullet mold materials polyphones.Construct with thin " sliding roadway arch " on the weak basement rock, not only save engineering quantity, improve the Arch Dam Stress that large deformation causes greatly, and build the less rolled concrete arch dam of engineering quantity and accelerate speed of application greatly, with the plane arch is the main water pressure of bearing, and reduces the threat that the interlayer defective is brought safety of dam body (fail in shear), and roller compacted concrete also can reduce temperature rise and internal-external temperature difference, reduce the dam body crack, guarantee the dam body quality.
In fact the present invention establishes flexible material strip at the arch dam tensile region and can both improve dam body stress applicable to building arch dam on the above soft foundation of batholith bullet mould 3000～4000MPa.Short in the extremely frigid zones construction period, can accelerate the date of putting into operation greatly with roller compacted concrete, cement consumption is few, alleviates the temperature control burden, reduces construction period dam body temperature drop and internal-external temperature difference, to guaranteeing that the dam concrete quality also is significant.
Description of drawings
Fig. 1 a is a flexible arch for roling concrete on soft foundation of the present invention dam embodiment formation level schematic diagram.
Fig. 1 b is an a left side/right dam abutment partial enlarged drawing among Fig. 1 a.
Fig. 2 a is that flexible arch for roling concrete on soft foundation of the present invention dam embodiment constructs elevational schematic view.
Fig. 2 b is the detailed structure schematic diagram that leans on the dam body bottom among Fig. 1.
The embodiment of specific embodiment the present invention's design is described with reference to the accompanying drawings as follows:
Present embodiment is to build (mud calcite cementation conglomerate on extremely frigid zones (average temperature of the whole year+4.1 degree), soft foundation, play mould 4000MPa, the rolled concrete arch dam of maximum tensile and compressive strength 12～14MPa), 109 meters of heights of dam, nearly hundred meters of river valley bottom width, arch thrust is big, for reducing the soft foundation intensity of pressure and displacement, the abut part widen the dam thick 1/5, the maximum bottom width of arch dam section beam is 30 meters, for roller compaction construction demand dam crest wide 5 meters.Dam body adopts the present invention's structure.
Present embodiment sliding roadway arch structure is shown in Fig. 1 a, 1b and Fig. 2 a, 2b.The abut concrete inserts soft rock securely, so that dam body and rock are out of shape jointly.The RCCD (Roller Compacted Concrete Dam) segment length reaches 80 meters, and the construction period relies on the relaxation of deformation tensile stress of the centre joint 7 during the dam body temperature drop.Spandrel fg along the soft rock face if by drawing crack, can be bonding again by backfill contact grouting 31,32, transmit pressure to guarantee the later stage.The dam body upstream is established hinged well 6 because the cooling of natural or manual type forms low-temperature space at low-temperature space, forms hinged arch behind the backfill expansive concrete in the hinge knot well, and then the construction period gets final product dash, treats that dam body temperature drop centre joint 7 to the temperature of being in the milk be in the milk again to form whole the arch.Establish grouting system 5 in the centre joint.
Present embodiment adopt modulus of elasticity be the oil immersion pitch plank of 300MPa as flexible material strip: on horizontal arch ring, establish flexible material strip 21 at the left and right sides, upstream dam abutment tensile region (approximately in 10 meters of rock faces) and downstream arch crown tensile region (about 1/3 arch is long), 22,23, the tensile region flexible material strip radical length ab of downstream arch crown and the left and right sides, upstream dam abutment tensile region flexible material strip radical length a
1b
1About 1～2 meter, the left and right sides, upstream dam abutment tensile region flexible material strip bending length b
1C is 1～2 meter and and a radially
1b
1Angle 30～60 degree.Relative fixed end distortion changes arch crown curvature under the flexible band hydraulic action, reduces the arch dam pulling force, improves the plane arch thrust greatly.The flexible band of upstream arch crown and left and right sides dam abutment is established sealing 41,42 respectively from the about 30cm of upstream dam facing place, in case flexible band is interior because hydraulic pressure causes splitting.The flexible band edge point of left and right sides dam abutment and upstream arch crown (as the c point) is used channel-section steel crack arrest, and arch crown flexible band edge in downstream also can be established crack arrest channel-section steel 11.On the arch dam facade, flexible material strip arranges continuously toward arching action district, the main plane of dam abutment, the left and right sides, upper edge highly that from about height of dam 1/5 more than the arch dam pedestal channel-section steel 13 crack arrest are also established in the flexible material strip bottom.Dam crest is to be left the vertical cantilever that transverse joint is isolated in 1: 0.6～1: 0.8 in the scope in depth-width ratio, to cut down the temperature arch to pulling force, can improve arch dam middle and lower part beam to stress when high water level.Can establish grouting system around the flexible material strip.
Get rigid foundation bullet mould 2000MPa for comparing the stress displacement, dam concrete bullet mould 2000MPa calculates relatively with 14330 finite elements.
Control point stress (MPa) under the table 1 hydraulic pressure load action
| ▽ 1308 (1/4 sagitta) upstream dam abutment encircles to stress | Arch crown place, upstream arch is to stress | ▽ 1345 (2/3 height of dam place) downstream face encircles to stress | Dam, ▽ 1291 upstream heel beam is to stress | |
| Rigid arch, rigid foundation | +5.4 | -1.9 | -1.5 | +3.5 |
| Sliding roadway arch, basis | +1.2 | -2.2 | -1.3 | +2.0 |
Annotate: "+" expression tensile stress in the table, "-" expression compressive stress.
Suitable river, control point is to displacement (mm) under the table 2 hydraulic pressure load action
| ▽ 1355 abuts | The abut displacement | ▽ 1394 (arch item) displacement | |
| Rigid arch, rigidity base | -3～-15 | -0.8～-2 | -16.2 |
| Sliding roadway arch, flexible base | -5～-20 | -1.9-4 | -22.4 |
Annotate: "-" represents displacement downstream in the table.
As seen on flexible foundation, adopt sliding roadway arch, though strengthen 1/4 to displacement along the river, but upstream dam abutment pulling force drops to safety value, upstream dam facing pressure strengthens, the abut cross-section pressure strengthens, also all in safety value, sliding roadway arch reduce dam heel beam to pulling force (with the deadweight stack still in safety value), so sliding roadway arch is favourable to the Arch Dam Stress of hydraulic pressure area.
Sliding roadway arch effect under the temperature load: dam body and rock interface produce big stress and concentrate when 10 ℃ of whole temperature drops, rigid arch dam abutment upstream face tensile stress reaches 4.8MPa, and sliding roadway arch drops to 1.48MPa, reduces the short seam of about 2/3, the 1/4 arch place tensile stress 0.5 ~ 1.0MPa that also descends.The artificial short-seam that the downstream face centre joint keeps reduces the peak value of downstream arch crown pulling force, and sliding roadway arch dam body rigidity reduces displacement and increases the displacement that adapts to the dam body temperature drop.
As seen the sliding roadway arch dam body is concentrated because of reduction dam body rigidity reduces dam body stress under hydraulic pressure and temperature load effect, improve dam body stress greatly, the displacement of sliding roadway arch dam body increases but stress does not worsen to some extent at hydraulic action, concentrate though increase dam abutment thickness can not improve dam abutment upstream face stress, can reduce the compressive stress and the shear stress of dam body and rock contact surface.Therefore sliding roadway arch can solve the dam body displacement in conjunction with the local thickening of dam abutment and strengthens and cause the stress deterioration problem, builds arch dam on the weak basis and is not difficult by adopting structural measure to become feasible.
Claims (4)
1, a kind of flexible arch for roling concrete on soft foundation, it is characterized in that, be included on the horizontal arch ring, left and right dam abutment tensile region in upstream and downstream arch crown tensile region are established flexible material strip, the flexible material strip radical length (a of the left and right dam abutment tensile region of flexible material strip radical length (ab) and upstream of this downstream arch crown tensile region
1b
1) be 1～2 meter, upstream left and right dam abutment tensile region flexible material strip bending length (b
1C) be 1～2 meter, and bending length (b
1C) and radical length (a
1b
1) angle be 30～60 the degree, the flexible material strip of downstream arch crown and left and right dam abutment tensile region is established sealing respectively from dam facing 30～40cm place, upstream, the flexible material strip end points of left and right sides dam abutment tensile region is provided with the crack arrest channel-section steel, and downstream arch crown flexible material band edge also is provided with the crack arrest channel-section steel; On the arch dam facade, past arching action district, the main plane of dam abutment, the left and right sides, upper edge is provided with flexible material strip continuously from the height on 1/5 dam more than the arch dam pedestal, and this flexible material strip bottom also is provided with the crack arrest channel-section steel.
2, flexible arch for roling concrete on soft foundation as claimed in claim 1 is characterized in that, comprises that also dam crest is the vertical cantilever that had transverse joint to isolate in the scope in 1: 0.6～1: 0.8 in depth-width ratio.
3, flexible arch for roling concrete on soft foundation structure as claimed in claim 1 is characterized in that, is provided with grouting system around the said flexible material strip.
4, flexible arch for roling concrete on soft foundation structure as claimed in claim 1 is characterized in that, said flexible material strip adopts the material of modulus of elasticity at 300 ~ 500MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01130892 CN1125904C (en) | 2001-08-31 | 2001-08-31 | Flexible arch for roling concrete on soft foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01130892 CN1125904C (en) | 2001-08-31 | 2001-08-31 | Flexible arch for roling concrete on soft foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335432A CN1335432A (en) | 2002-02-13 |
| CN1125904C true CN1125904C (en) | 2003-10-29 |
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ID=4670218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01130892 Expired - Fee Related CN1125904C (en) | 2001-08-31 | 2001-08-31 | Flexible arch for roling concrete on soft foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1125904C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071660A (en) * | 2010-11-26 | 2011-05-25 | 河海大学 | Method for releasing dam heel stress of arch dam |
| CN103031822A (en) * | 2011-09-30 | 2013-04-10 | 杨清太 | Construction method for arched structure thin-layer wall surface water seepage pressure reduction dam |
| CN102808395B (en) * | 2012-08-22 | 2014-05-28 | 清华大学 | Personalized control method for cantilever height of ultra-high arch dam |
| CN110619170B (en) * | 2019-09-11 | 2023-01-06 | 中国三峡建设管理有限公司 | Method for performing construction control by utilizing arch dam upstream overhang analysis |
| CN117552430B (en) * | 2024-01-11 | 2024-04-12 | 中国电建集团西北勘测设计研究院有限公司 | Non-radial excavation method for dam abutment of arch dam |
-
2001
- 2001-08-31 CN CN 01130892 patent/CN1125904C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1335432A (en) | 2002-02-13 |
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