CN101285302B - Method for reinforcing caisson of concrete dam - Google Patents
Method for reinforcing caisson of concrete dam Download PDFInfo
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- CN101285302B CN101285302B CN2008101145159A CN200810114515A CN101285302B CN 101285302 B CN101285302 B CN 101285302B CN 2008101145159 A CN2008101145159 A CN 2008101145159A CN 200810114515 A CN200810114515 A CN 200810114515A CN 101285302 B CN101285302 B CN 101285302B
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- 239000004567 concrete Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 48
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 238000005728 strengthening Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 abstract 1
- 238000005056 compaction Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 239000011376 self-consolidating concrete Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 230000003487 anti-permeability effect Effects 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The invention provides a method for reinforcing a concrete dam by caissons, relating to a method for reinforcing a concrete dam. In the reinforcing method, caissons are arranged in the front dam section of the dam needing to be reinforced, forming a caisson group; reinforced concrete caissons are used as the construction surface of riprap type rock-fill concrete, and the riprap type rock-fill concrete is used to quickly backfill box grids of the caissons and the connection between the caissons and the dam body, and conventional type rock-fill concrete is used to concrete up to the design elevation, and the front-dam reinforcement of the concrete dam is completed. The method does not need to empty a reservoir, thereby the construction is easy and convenient, and effects of improving the construction efficiency and saving the construction cost are obviously; moreover, the method has the advantages of high compaction degree of the formed riprap type concrete filling caisson structure, little cement amount, low hydration temperature rise, good volume stability, good impermeability, excellent comprehensive performance, energy conservation and environmental protection, etc.
Description
Technical field
The present invention relates to a kind of reinforcement means of concrete dam, when particularly before the concrete dam dam, reinforcing, adopt Jackstone-type rockfill concrete landfill caisson mode reinforcement means.
Background technology
Concrete dam tends to cracking occur under various load actions during long-time running, influences dam safety and anti-permeability performance, reduces the dam durability, need carry out consolidation process.In stabilization works,, generally can adopt method such as reinforcing before dam body surfacing, grouting treatment, dam post-reinforcing and the dam at the actual conditions of different dams.
Generally speaking, the dam body surfacing is only applicable under the situation of dry work plane, and is proper for the external crack at dam body downstream face or dam body top.In the place that the grouting condition is arranged, adopting grouting treatment also is the effective means of dam body consolidation, but application conditions is restricted.Bigger for dam body cracking scope, when dam body stress and stable being a greater impact,, often need to adopt the mode of widening dam body to reinforce in order to guarantee the safety of dam comprehensively.The mode of widening dam body generally has reinforcing dual mode before dam post-reinforcing and the dam.Adopt dam post-reinforcing mode, can not need the emptying reservoir, reduce the influence of strengthening construction, still, the dam post-reinforcing is generally unfavorable to improving the dam anti-permeability performance, and the dam of factory building behind the dam is particularly arranged, and adopts dam post-reinforcing difficulty bigger.Adopt reinforcing mode before the dam, can improve the dam anti-permeability performance, especially to strengthening heel position, dam advantageous particularly, still, and under the general condition, reinforcing or need carry out subaqueous construction before the dam; Perhaps need the emptying reservoir, will construct after the silt displacement of depositing before the dam, make that strengthening construction is very big to the influence of dam operation before the dam.
The caisson form of construction work that extensively adopts in constructions such as bridge, harbour, dam can be carried out foundation dredging under water, has special superiority.In recent years, method for constructing normal piled concrete (Jin Feng, An Xuehui, little former filial piety etc. method for constructing normal piled concrete, 200710100315.3,2007.6.8) and Jackstone-type rockfill concrete construction method (An Xuehui, Jin Feng, little former filial piety etc. Jackstone-type rockfill concrete construction method, 200710121791.3,2007.9.14) in the construction of dam etc., be used widely, particularly Jackstone-type rockfill concrete has been successfully applied to caisson concrete backfill construction, has accelerated caisson backfill construction speed greatly.Normal piled concrete is at rock-fill concrete dam construction method (Jin Feng, An Xuehui. the rock-fill concrete dam construction method, ZL03102674.5,2006.1.25) on the basis, adopt particle diameter to surpass piece stone or the cobble of 15cm, using common vehicle to be transported in the face of storehouse piles up naturally, use the self-compacting concrete that meets the demands from the cast naturally of rockfill surface then, only rely on self-compacting concrete deadweight to fill the enrockment space, form fine and close and have the rock-fill concrete of higher-strength.Jackstone-type rockfill concrete is on rock-fill concrete dam construction method (ZL03102674.5) basis, earlier education resistance can be put in storage in self-compacting concrete cast superior and that the protect plasticity energy is good, piece stone or cobble with various particle diameters uses machinery or artificial mode to be thrown in the self-compacting concrete of having poured into a mould then, piece stone or cobble under the deadweight effect in self-compacting concrete deposition, finally form complete closely knit rock-fill concrete.Compare with original conventional concrete backfill method, this method has been simplified construction technology and required construction equipment greatly, and speed of application is greatly improved; Use big gauge block stone and cobble, every side's rock-fill concrete only needs 40%～50% concrete, effectively reduces the concrete cost more than 30%, efficiently solves the heat of hydration problem of concrete in mass.
Summary of the invention
The objective of the invention is to utilize the caisson construction technology, propose reinforced construction method before a kind of new dam dam, no longer need the emptying reservoir, significantly reduced the influence of strengthening construction the dam operation.Simultaneously, utilize Jackstone-type rockfill concrete construction method, can further bring into play the comprehensive premium properties of rock-fill concrete, reduce construction cost, accelerate the construction period.
The present invention is achieved through the following technical solutions:
A kind of method for reinforcing caisson of concrete dam is characterized in that this method comprises the steps:
1) is sink to bedrock surface 4 or below the bedrock surface, arranges a plurality of caissons along dam length with upstream face 1～2m distance of caisson 1 drag and drop, and with caisson, form caisson group 5 at the monolith that needs reinforcement to the concrete dam body 2 of required reinforcing;
2) adopt Jackstone-type rockfill concrete construction method,, carry out the rock-fill concrete backfill of each caisson the trave of caisson 1 lift surface as Jackstone-type rockfill concrete 6;
3) caisson group 5 backfills finish, and do sealing between each caisson of caisson group 5;
4) find time between caisson group 5 and dam body ponding and remove mud after, adopt Jackstone-type rockfill concrete construction method, be connected with Jackstone-type rockfill concrete 62 of caisson group 5 and concrete dam bodies;
5) on the caisson group that backfill finishes, carry out the construction of concrete or normal piled concrete 8, build, finish the concrete dam strengthening to design height 9.
Another technical characterictic of the present invention is: in the step 4) of technique scheme, when find time between caisson group and dam body ponding and remove mud after, can build steel concrete transfer beam 7 at interval from bottom to up at caisson group 5 and 2 of concrete dam bodies earlier, and then be connected with Jackstone-type rockfill concrete 6.
The section of caisson of the present invention adopts rectangle or trapezoidal 10; The length of each caisson can determine that its length can be between 10m-30m according to landform geological conditions and former dam body monolith width, and width is at several meters to 10 several meters, and the degree of depth is at least 60m.
The present invention is carrying out on the basis of comprehensive analysis existing concrete dam reinforcement means, caisson job practices and Jackstone-type rockfill concrete construction method, a kind of new concrete dam reinforcing technique of proposition.Compared with the prior art, the present invention has the following advantages and the high-lighting effect: 1. be applicable to dissimilar concrete dam reinforcings, adopt reinforcing mode before the dam, help seepage control of dam, avoid in the dam post-reinforcing mode, the contradiction of factory building behind dam strengthening and the dam, the scope of application is more extensive; 2. in the work progress of dam strengthening, need not the emptying reservoir, can realize the free of discontinuities performance of reservoir benefit in the strengthening construction process, the loss of the benefits such as hydropower station that the minimizing strengthening construction causes; 3. adopt Jackstone-type rockfill concrete and normal piled concrete to construct, can further reduce the construction equipment requirement, accelerate speed of application, reduce construction cost, and can give full play to the rock-fill concrete density advantage big, under the condition that weight meets the demands, can reduce construction concrete square amount than ordinary concrete density.
Description of drawings
Fig. 1 is the upstream face of the caisson concrete dam body that is placed on required reinforcing and it is sink to the schematic diagram of mud face.
Fig. 2 is that caisson is sink to the schematic diagram under the bedrock surface.
Fig. 3 arranges that along dam length a plurality of caissons form the schematic diagram of caisson group at the monolith that needs reinforcement.
Fig. 4 adopts Jackstone-type rockfill concrete backfill caisson trave schematic diagram.
Fig. 5 builds the schematic diagram that the steel concrete transfer beam is connected at caisson with the dam body interbody spacer.
Fig. 6 be caisson with dam body between adopt Jackstone-type rockfill concrete to be connected schematic diagram.
Fig. 7 adopts concrete or normal piled concrete to build to the design altitude schematic diagram.
Fig. 8 a, 8b are that section is trapezoidal caisson schematic diagram.
The specific embodiment
The present invention is on the basis of existing normal piled concrete and Jackstone-type rockfill concrete construction technology, in conjunction with the caisson technology concrete dam is carried out reinforcing before the dam.Carry out the caisson construction with reference to the caisson job practices of extensive use in the engineering, with the upstream face 1～2m distance of caisson 1 drag and drop to the concrete dam body 2 of required reinforcing, and caisson is sink to bedrock surface 4 or below the bedrock surface, adopt being connected between Jackstone-type rockfill concrete backfill caisson and caisson and dam body then, to reduce temperature control, ensure the quality of products, accelerating construction progress reduces construction cost.After suitably reducing water level, find time between caisson group 5 and dam body ponding and remove mud, adopt Jackstone-type rockfill concrete 6 to be connected; Perhaps build the steel concrete transfer beam from bottom to up at interval at caisson group 5 and 2 of concrete dam bodies earlier, strengthen the contact of caisson and dam dam body, and the part water pressure of caisson reached the dam dam body, reduce caisson construction party amount, and then be connected with Jackstone-type rockfill concrete 6.As required, more than the caisson group top, adopt concrete or method for constructing normal piled concrete, Jiang Baqian adds solid and builds to design height, finishes the concrete dam strengthening.Repeat the caisson construction before the dam dam, form caisson group, each caisson of caisson group can while or stage construction.The length of each caisson should determine that generally at 10m-30m, width can be at several meters to 10 several meters according to landform geological conditions and former dam body monolith width, and the degree of depth is according to existing engineering experience, 60m at least, in addition darker.
Further specify embodiments of the present invention below in conjunction with accompanying drawing, concrete mode can be implemented as follows:
1) caisson 1 is fixed on upstream face 1～2m distance of the concrete dam body 2 that needs reinforcement, and caisson 1 is sink to mud face 3.Caisson 1 is prefabricated reinforced concrete structure or monolithic reinforced concrete structure, as shown in Figure 1.
2) in caisson 1, remove mud to bedrock surface 4 or below the bedrock surface, as shown in Figure 2.Arrange a plurality of caissons at the monolith that needs reinforcement along dam length, form caisson group 5, as shown in Figure 3.
3) adopt Jackstone-type rockfill concrete construction method,, carry out the rock-fill concrete backfill of each caisson respectively, caisson group 5 backfills are finished, as shown in Figure 4 the trave of caisson 1 lift surface as Jackstone-type rockfill concrete 6.Each caisson of caisson group can while or stage construction.Between each caisson of caisson group 5, do sealing, utilize grouting or Jackstone-type rockfill concrete to seal each caisson junction then.
4) suitably reduce water level after, the ponding between caisson group 5 and the concrete dam body 2 of finding time, mud and basement rock between excavation caisson and concrete dam body adopt Jackstone-type rockfill concrete 6 to carry out caisson group 5 and are connected with 2 of concrete dam bodies.Perhaps build the steel concrete transfer beam from bottom to up at interval at caisson group 5 and 2 of concrete dam bodies earlier, as shown in Figure 5, strengthen the contact of caisson and dam dam body, and the part water pressure of caisson reached the dam dam body, reduce caisson construction party amount, and then be connected with Jackstone-type rockfill concrete 6.As shown in Figure 6.
5) more than the caisson group top that backfill finishes, adopt concrete or method for constructing normal piled concrete, carry out the construction of normal piled concrete 8, until building, finish the concrete dam strengthening to design height 9.As shown in Figure 7.
6) section of caisson 1 can also adopt shown in Fig. 8 a, 8b trapezoidal 10.
Claims (4)
1. a method for reinforcing caisson of concrete dam is characterized in that this method comprises the steps:
1) is sink to bedrock surface (4) or below the bedrock surface, arranges a plurality of caissons along dam length with upstream face 1～2m distance of caisson (1) drag and drop, and with caisson, form caisson group (5) at the monolith that needs reinforcement to the concrete dam body (2) of required reinforcing;
2) adopt Jackstone-type rockfill concrete construction method,, carry out the rock-fill concrete backfill of each caisson the trave of caisson (1) lift surface as Jackstone-type rockfill concrete (6);
3) caisson group (5) backfill finishes, and does sealing between each caisson of caisson group (5);
4) find time between caisson group (5) and dam body ponding and remove mud after, adopt Jackstone-type rockfill concrete construction method, between caisson group (5) and concrete dam body (2), be connected with Jackstone-type rockfill concrete (6);
5) carry out the construction of concrete (8) at the caisson group top that backfill finishes, build, finish the concrete dam strengthening to design height (9).
2. according to the described a kind of method for reinforcing caisson of concrete dam of claim 1, it is characterized in that: the concrete described in the step 5) adopts normal piled concrete.
3. a kind of method for reinforcing caisson of concrete dam as claimed in claim 1 or 2, it is characterized in that: in described step 4), find time between caisson group (5) and dam body ponding and remove mud after, between caisson group (5) and concrete dam body (2), build the steel concrete transfer beam at interval from bottom to up earlier, and then be connected with Jackstone-type rockfill concrete (6).
4. a kind of method for reinforcing caisson of concrete dam as claimed in claim 1 or 2 is characterized in that: the section of described caisson (1) adopts rectangle or trapezoidal (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101145159A CN101285302B (en) | 2008-06-06 | 2008-06-06 | Method for reinforcing caisson of concrete dam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101145159A CN101285302B (en) | 2008-06-06 | 2008-06-06 | Method for reinforcing caisson of concrete dam |
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| CN101285302A CN101285302A (en) | 2008-10-15 |
| CN101285302B true CN101285302B (en) | 2010-06-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102182163B (en) * | 2011-04-02 | 2012-09-05 | 中国科学院水利部成都山地灾害与环境研究所 | Assembled type debris flow silt dam and construction method thereof |
| CN106368175B (en) * | 2016-11-01 | 2018-08-17 | 安徽师范大学 | A kind of multi-functional environment-protection dam |
| CN110241827B (en) * | 2019-07-10 | 2022-05-17 | 智连空间测绘技术(苏州)有限公司 | Underwater concrete pouring construction method |
| CN110685459B (en) * | 2019-10-21 | 2021-03-05 | 中国水利水电第三工程局有限公司 | Breaking hammer dismantling construction method for dismantling hoist bent from lower part |
| CN113482053B (en) * | 2021-07-12 | 2023-03-31 | 上海东华建设管理有限公司 | Caisson connecting section triangular area underwater concrete construction structure and construction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521363A (en) * | 2003-02-14 | 2004-08-18 | 清华大学 | Construction method for rock-fill concrete dam |
| CN101074560A (en) * | 2007-06-08 | 2007-11-21 | 清华大学 | Method for constructing normal piled concrete |
| CN101144279A (en) * | 2007-09-14 | 2008-03-19 | 清华大学 | Jackstone-type rockfill concrete construction method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521363A (en) * | 2003-02-14 | 2004-08-18 | 清华大学 | Construction method for rock-fill concrete dam |
| CN101074560A (en) * | 2007-06-08 | 2007-11-21 | 清华大学 | Method for constructing normal piled concrete |
| CN101144279A (en) * | 2007-09-14 | 2008-03-19 | 清华大学 | Jackstone-type rockfill concrete construction method |
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Application publication date: 20081015 Assignee: Beijing SinoConfix Technology Co., Ltd. Assignor: Tsinghua University Contract record no.: 2014990000758 Denomination of invention: Method for reinforcing caisson of concrete dam Granted publication date: 20100609 License type: Exclusive License Record date: 20140922 |
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