CN1125905C - Artificial short-seam structure of rolled concrete arch dam - Google Patents
Artificial short-seam structure of rolled concrete arch dam Download PDFInfo
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- CN1125905C CN1125905C CN 01142035 CN01142035A CN1125905C CN 1125905 C CN1125905 C CN 1125905C CN 01142035 CN01142035 CN 01142035 CN 01142035 A CN01142035 A CN 01142035A CN 1125905 C CN1125905 C CN 1125905C
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- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000004567 concrete Substances 0.000 claims description 36
- 238000011144 upstream manufacturing Methods 0.000 claims description 25
- 239000011440 grout Substances 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 230000035882 stress Effects 0.000 description 36
- 239000008267 milk Substances 0.000 description 10
- 210000004080 milk Anatomy 0.000 description 10
- 235000013336 milk Nutrition 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 240000002853 Nelumbo nucifera Species 0.000 description 8
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 8
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 8
- 238000003618 dip coating Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 7
- 230000008646 thermal stress Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000023753 dehiscence Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004575 stone Substances 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 a left dam shoulder and a right dam shoulder of an arch dam of rolled concrete are provided with artificial folding seams; a water stop system, a water drainage system and a grouting system are arranged in the seams, and the end of each seam is provided with anticracking materials; a downstream arch crown of the arch dam is provided with an artificial radial short seam, and the end of the seam is provided with anticracking materials. The present invention can effectively release the temperature stress of rolled concrete with a large surface during the construction period of the dam, and the temperature drop tensile stress and the water load tensile stress of the arch dam during the operation period. If the artificial folding seams of the dam shoulders are grouted during the last period of construction, the stability of an arch seat can be improved.
Description
Technical field
The invention belongs to the hydraulic engineering technical field, particularly the rolled concrete arch dam structure design.
Background technology
Arch dam is the whole statically-indeterminate structure that is fixed on the basic rock mass, concrete internal temperature rising in early stage after the concrete pouring, the surface radiating temperature is low, internal-external temperature difference forms the temperature difference tensile stress on surface, the arched concrete dam post drop causes that pulling force especially produces bigger temperature tensile stress at abut upstream face and arch crown downstream face, the water ballast(ing) of reservoir filling also can strengthen the tensile stress of abut upstream face, when the tensile stress that causes when temperature and water ballast(ing) surpasses concrete tensile strength, the crack will appear in dam body, destroys the globality of arch dam.Conventional arched concrete dam is adopted the cast of cylinder method piecemeal for preventing the crack construction phase, establishes transverse joint for per 15 meters ~ 20 meters along arch axis, but the variations in temperature Free Transform, and transverse joint adopts radial arrangement, and dam body is divided into some monoliths.Pre-embedment grouting pipe and grout cell in the seam are so that dam body cooling post-grouting forms whole arch.Precooling concrete material commonly used, bury underground in the dam cooling water pipe carry out water flowing cooling with reduce early stage maximum temperaturerise and measure such as later stage forced cooling make the dam concrete temperature be cooled to equilibrium temperature, after concrete fully shrank, row grouting envelope was encircleed again, to guarantee the globality of arch dam.
Adopt roller compacted concrete to replace normal concrete over nearly 30 years, its advantage is a, cast fast continuously, can shorten and build a dam the duration, saves dynamic investment greatly; B, minimizing cement consumption, but still can keep higher later strength, and corresponding minimizing is to the requirement of concrete temperature control; C, can simplify construction technology, the face cast of big storehouse.7 of rolled concrete arch dams have been built up both at home and abroad.South Africa 1988 and nineteen ninety have been built up two roller compacted concrete thick arch dams (the 50 meters high Wu Leweidansi dams of overstating Er Boerte dam and 70 meters high), adopt the face cast of full storehouse, do not establish transverse joint, its temperature-induced sewing cloth is put as shown in Figure 1, at upstream face temperature-induced seam (11-15) is set, be bordering on radial arrangement, seam length is 2 meters, and the spacing between the seam is 10 meters, thisly temperature-inducedly is sewn to the runtime and inwardly passes with tensile region, what have develops into the penetrability crack, has destroyed the globality of arch dam.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, a kind of artificial short-seam structure of rolled concrete arch dam is proposed, make it can bring into play the superiority of the big storehouse of roller compacted concrete face continuous pouring, the tensile stress of convenient again reduction arch dam, abut upstream face and arch crown downstream face at rolled concrete arch dam provide the Free Transform face, effective stress release can be carried out, and the position in tensile region crack can be controlled.
A kind of rolled concrete arch dam artificial short-seam structure that the present invention proposes, comprise the grouting system that is embedded with sealing sheet, gutter, arising pipe and grout cell, it is characterized in that, the dam abutment upstream, the left and right sides that also is included in rolled concrete arch dam is provided with artificial crease, upstream face at artificial crease is established said sealing sheet, establish gutter in the seam, tape edge portion arranges arising pipe and grout cell, and the seam end is provided with the crack arrest material; The downstream arch crown tensile region of arch dam is provided with artificial radial slot, and the seam end is established the crack arrest material, and the modulus of elasticity of said crack arrest material is greater than 200000Mpa.
The radial section length of said artificial crease is 1.0 meters～1.5 meters, and the crease rotational angle theta is about 30～60 °, and bending segment length is close with radial section length; Described artificial radial slot, its radical length are 1 meter～2 meters.
Adopt the base of normal concrete or abnormal concrete at left and right sides dam abutment.
Also be included in dam abutment downstream, the left and right sides and establish subsides angle with dam body roller compacted concrete same material.
The radial section length of said artificial crease is 1.0 meters～1.5 meters, general should not surpass the dam thick 1/4, in order to avoid strengthen dam abutment shear stress, the crease rotational angle theta is about 30～60 °, bending segment length is close with radial section length.Tape edge portion arranges arising pipe and grout cell, so that be in the milk behind the concrete cooling of dam facing position, upstream, is linked to be integral body.Crack arrest material that described seam end is buried underground such as steel etc. can increase toughness, stop the crack development.
Described artificial radial slot, its radical length are 1 meter～2 meters, and the seam petiolarea is buried the crack arrest material underground, stop the crack development.Said concrete base can increase the contact surface of dam concrete and rock, makes rock stressed evenly, strengthens the shear resistance of base surface, can increase also that the upstream is anti-streams ability, is convenient to bury underground the built-in fitting of artificial crease, improves effective power transmission section.The angle is pasted in said spandrel downstream can compensate the dam body thickness that weakens owing to artificial crease radial section, strengthens the dam abutment shear resistance.
Described artificial radial slot adopts dip-coating pitch plank to make, after cooling off naturally, the abnormal roller compacted concrete on dip-coating pitch plank both sides can form permanent short seam, be not in the milk in the seam, can discharge the thermal stresses of arch dam downstream face construction period and runtime and the water lotus stress of runtime, the crack arrest material is established in the seam end, can prevent that seam from extending in the dam.
Effect of the present invention and effect
After rolled concrete arch dam is poured monolithically and is annotated, because the influence of large tracts of land heat of hydration temperature rise, the inner concrete temperature of arch dam is higher, and the top layer concrete is subjected to the such environmental effects temperature lower, this just forms bigger internal-external temperature difference tensile stress, can reduce thermal (temperature difference) stress with high fly ash low-heat concrete.If dam abutment artificial crease in upstream can be transferred to the tensile region of dam abutment upstream section inner seam end, with crease seam end is changed over to the low stress area, also can reduce to stitch the angle of cut with inner principal tensile stress direction, to cut down seam end energy to failure, bury the crack arrest material underground at the seam petiolarea, can prevent that seam from extending in the dam.The main effect of the artificial crease of dam abutment is the temperature tensile stress that discharges the rolled concrete arch dam construction period, to constructing latter stage, the reservoir filling eve, after arch dam upstream skin section megadyne temperature falls, also can be to the envelope arch that is in the milk in the artificial crease, arch dam integral body is born the effect of runtime water lotus, and increases the stability of arch dam.Be not in the milk in the artificial short-seam of downstream, can bear the effect that discharges arch crown downstream water lotus tensile stress and construction period and runtime temperature tensile stress.
When rolled concrete arch dam is not established transverse joint for accelerating the cast progress, adopt artificial crease in dam abutment upstream and the artificial radial slot in arch crown downstream can discharge the thermal stresses of construction period big storehouse face roller compacted concrete effectively, construct latter stage, if the artificial crease in dam abutment upstream is in the milk, be linked to be the arch dam overall structure, can effectively bear the water lotus effect behind the reservoir filling, and dam abutment thrust turned to the upstream slightly, increase the stability of arch dam abut, and the manually radially short seam in arch crown downstream is not in the milk, and this short seam can discharge arch crown downstream water lotus tensile stress and runtime temperature drop tensile stress effectively.
Artificial short-seam structure of the present invention is applicable to the rolled concrete arch dam in monthly mean temperature area more than 0 ℃, sufficient cheap flyash, stone flour and admixture supply area are especially arranged, low type rolled concrete arch dam in general, do not need to establish transverse joint, can accelerate the cast progress greatly, realize the construction period retaining, bring into play project benefit in advance.
Description of drawings
Fig. 1 puts schematic diagram for temperature-induced the sewing cloth of existing a kind of roller compacted concrete thick arch dam.
Fig. 2 is that rolled concrete arch dam artificial short-seam structure of the present invention is arranged schematic diagram.
Fig. 3 is the embodiments of the invention structural representation, and wherein, figure a is the arch ring floor map, and figure b is an arch crown beam sectional schematic diagram.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
The rolled concrete arch dam artificial short-seam structure that the present invention proposes as shown in Figure 2, among the figure, establish artificial crease 211 and 212 at dam abutment position, the arch dam left and right sides, radical length is 1.0 meters～1.5 meters, general should not surpass the dam thick 1/4, in order to avoid strengthen dam abutment shear stress, the crease rotational angle theta is about 30～60 °, and crease length is with radially close.Upstream face at artificial crease is established sealing 231 and 232, establishes gutter 241 and 242 in the seam, and tape edge portion arranges arising pipe and grout cell 251 and 252, so that be in the milk behind the concrete cooling of dam facing position, upstream, is linked to be integral body.The seam petiolarea is buried crack arrest material 261 and 262 underground, to increase toughness, stops the crack development.
Establish artificial vertical masonry joint 221,222 and 223 at arch dam downstream arch crown tensile region, radical length is 1 meter ~ 2 meters, and short seam is made with dip-coating pitch plank, and the seam petiolarea is buried crack arrest material 263,264 and 265 underground, stops the crack development.
The concrete base: dam body adopts the roller-compacting concrete material R11 of full storehouse face, use the base R21 and the R22 of normal concrete or abnormal concrete instead at two dam abutments, to increase the contact surface of dam concrete and rock, make rock stressed evenly, strengthen the shear resistance of base surface, can increase also that the upstream is anti-streams ability, be convenient to bury underground the built-in fitting of artificial crease, improve effective power transmission section.
The angle is pasted in the spandrel downstream: establish the subsides angle R31 and the R32 of roller-compacting concrete material in the spandrel downstream, owing to the dam body thickness that artificial crease radial section weakens, strengthen the dam abutment shear resistance with compensation.
Dip-coating pitch plank: after the abnormal roller compacted concrete on dip-coating pitch plank both sides cools off naturally, can form permanent short seam, be not in the milk in the seam, can discharge the thermal stresses of arch dam downstream face construction period and runtime and the water lotus stress of runtime, the crack arrest material is established in the seam end, can prevent that seam from extending in the dam.
A kind of rolled concrete arch dam artificial short-seam constructed embodiment of the present invention's design as shown in Figure 3, present embodiment is the roller compacted concrete thin arch dam that (average temperature of the whole year is 18.2 ℃) builds in the area, temperate zone, 63.5 meters of heights of dam, 12 meters of dam base thicknesses, thickness high ratio 0.189, the dam body plane is a holocentric garden arch dam, for ease of grinding concrete construction, the upstream dam facing does not have adverse slope, 114 ° at center of maximum angle, 95.5 meters of dam crest arc length.The cement (425 of this roller compacted concrete thin arch dam
#) consumption is less, heat of hydration temperature rise lower (about 11 ℃ ~ 12 ℃) is carried out the face cast of the big storehouse of monolithic at low temperature season with lower placement temperature and is rolled.Dam body adopts artificial short-seam structure.Typical case arch ring plane and crown section signal are as accompanying drawing 3.
In two artificial creases 411 of arch dam left and right sides dam abutment provided upstream and 412, radical length is 1.5 meters, 2.0 meters of crease length.The angle of turning back of present embodiment crease is 45 °, when not establishing seam, first principal tensile stress when the dam abutment upstream section is subjected to the water lotus is 3.9MPa, first principal tensile stress of above-mentioned corresponding position drops to 0.3MPa behind 45 ° the crease and establish, along the principal tensile stress value on the thickness direction section all in concrete tension permissible value, near the crease seam end is 1.4MPa, is safe.The stress (March tensile stress maximum) of taking all factors into consideration construction period temperature Creep Stress and dropping to runtime alternating temperature field from construction temperature in latter stage, because inner total cooling value is bigger, the tensile stress field is strengthened, and artificial crease is set in this case still has positive effect to eliminating the arch dam upstream face that temperature drop brought apart from the tensile stress in 5 meters wide regions of dam abutment.Establish sealing 431 and 432 and draining 441 and 442 at the upstream face of the artificial crease of left and right sides dam abutment.Arranged arising pipe and grout cell 451 and 452 in the crease, when dam and reservoir retaining eve and partial storage, be in the milk, made arch dam be linked to be integral body, helped bearing the hydraulic pressure load, and improved the stability and safety of abut.Seam end has arranged that No. 16, channel-section steel as crack arrest device 461 and 462, to increase toughness, stops the crack development.
Be provided with the radially short of 4.5 meters of three stripe pitch, 1.5 meters～2 meters of radical lengths at arch dam downstream arch crown tensile region and stitch 421,422 and 423, short seam is made with dip-coating pitch template.Under hydraulic action, the effect length of seam is big, below the 0.5MPa the when 2.0MPa of the dam facing first principal tensile stress value in downstream when seamless reduces to long 2 meters of seam, radially moves in the maximum principal tensile stress district of section, and maximum value drops to 1.2MPa by seamless 1.6MPa.
The concrete base: dam body adopts the roller-compacting concrete material R41 of full storehouse face, use the base R51 and the R52 of normal concrete or abnormal concrete instead at two dam abutments, to increase the contact surface of dam concrete and rock, make rock stressed evenly, strengthen the shear resistance of base surface, can increase also that the upstream is anti-streams ability, be convenient to bury underground the built-in fitting of artificial crease, improve effective power transmission section.
The angle is pasted in the spandrel downstream: establish the subsides angle R61 and the R62 of roller-compacting concrete material in the spandrel downstream, owing to the dam body thickness that artificial crease radial section weakens, strengthen the dam abutment shear resistance with compensation.
Dip-coating pitch plank: after the abnormal roller compacted concrete on dip-coating pitch plank both sides cools off naturally, can form permanent short seam, be not in the milk in the seam, can discharge the thermal stresses of arch dam downstream face construction period and runtime and the water lotus stress of runtime, the crack arrest material is established in the seam end, can prevent that seam from extending in the dam.
It is just meaningful relatively the time that area of stress concentration especially stitches end calculated stress value, the energy of rupture of seam end can be by directly trying to achieve stress intensity factor apart from seam end known point coordinate and displacement field (or stress field) thereof, and it is better to calculate the energy to failure precision with seam face displacement of joint difference usually.The seam end unit size that this Arch Dam Stress is calculated is reduced to 0.5 meter, in four three-dimensional isoparametric elements around the seam end, gets the shift value of the last lower unit seam face node that contains seam, can be in the hope of three stress strength factor Ks of seam end
I, K
IIAnd K
IIIArtificial short-seam seam end is buried channel-section steel crack arrest underground, and its crack arrest effect was once measured with the three-point bending beam test, and result of the test shows: establishing channel-section steel than the maximum load capacity of not establishing increases by 25～30%; Energy to failure increases 23～30%; From seam end cracking, and the lateral dehiscence of channel-section steel from channel-section steel walked around in the crack when channel-section steel is arranged during no channel-section steel; Containing the seam cross section no longer is plane of weakness owing to there being the crack arrest channel-section steel to become, promptly stronger than the section resistivity of not having short seam.
The observed temperature of this arch dam engineering dam body distributes and calculates prediction close (error is less than 1.0 ℃～1.5 ℃), the thin arch dam temperature drop to stablize variable field after, the radial constraint crack does not appear in dam body.
Claims (5)
1, a kind of artificial short-seam structure of rolled concrete arch dam, comprise the grouting system that is embedded with sealing sheet, gutter, arising pipe and grout cell, it is characterized in that, the dam abutment upstream, the left and right sides that also is included in rolled concrete arch dam is provided with artificial crease, upstream face at artificial crease is established said sealing sheet, establish gutter in the seam, tape edge portion arranges arising pipe and grout cell, and the seam end is provided with the crack arrest material; The downstream arch crown tensile region of arch dam is provided with artificial radial slot, and the seam end is established the crack arrest material, and the modulus of elasticity of said crack arrest material is greater than 200000Mpa.
2, artificial short-seam structure of rolled concrete arch dam as claimed in claim 1 is characterized in that, the radial section length of said artificial crease is 1.0 meters～1.5 meters, and the crease rotational angle theta is about 30～60 °, and bending segment length is close with radial section length.
3, artificial short-seam structure of rolled concrete arch dam as claimed in claim 1 is characterized in that, said artificial radial slot, its radical length are 1 meter～2 meters.
4, artificial short-seam structure of rolled concrete arch dam as claimed in claim 1 is characterized in that, adopts the base of normal concrete or abnormal concrete at left and right sides dam abutment.
5, artificial short-seam structure of rolled concrete arch dam as claimed in claim 1 is characterized in that, also is included in dam abutment downstream, the left and right sides and establishes subsides angle with the dam body roller-compacting concrete material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01142035 CN1125905C (en) | 2001-09-07 | 2001-09-07 | Artificial short-seam structure of rolled concrete arch dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01142035 CN1125905C (en) | 2001-09-07 | 2001-09-07 | Artificial short-seam structure of rolled concrete arch dam |
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| CN1336466A CN1336466A (en) | 2002-02-20 |
| CN1125905C true CN1125905C (en) | 2003-10-29 |
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| CN 01142035 Expired - Fee Related CN1125905C (en) | 2001-09-07 | 2001-09-07 | Artificial short-seam structure of rolled concrete arch dam |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366826C (en) * | 2003-02-26 | 2008-02-06 | 中国水利水电科学研究院 | Anti-cracking method for new-old concrete junction plane after gravity dam heightening |
| CN101864751A (en) * | 2010-06-13 | 2010-10-20 | 中国水电顾问集团中南勘测设计研究院 | Abnormal concrete seepage-proofing body |
| CN102071660A (en) * | 2010-11-26 | 2011-05-25 | 河海大学 | Method for releasing dam heel stress of arch dam |
| CN102108692B (en) * | 2011-01-04 | 2012-08-01 | 中国水电顾问集团中南勘测设计研究院 | Roller compacted concrete dam and slit forming method thereof |
| CN102808395B (en) * | 2012-08-22 | 2014-05-28 | 清华大学 | Personalized control method for cantilever height of ultra-high arch dam |
| CN105133636A (en) * | 2015-08-14 | 2015-12-09 | 中国电建集团成都勘测设计研究院有限公司 | Concrete pedestal parting structure and construction method |
| CN105464047A (en) * | 2015-12-17 | 2016-04-06 | 中国电建集团贵阳勘测设计研究院有限公司 | Method and device for quickly forming short joints on periphery of roller compacted concrete arch dam |
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