CN113668542A - Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region - Google Patents
Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region Download PDFInfo
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- CN113668542A CN113668542A CN202111132637.2A CN202111132637A CN113668542A CN 113668542 A CN113668542 A CN 113668542A CN 202111132637 A CN202111132637 A CN 202111132637A CN 113668542 A CN113668542 A CN 113668542A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
- E02B7/10—Gravity dams, i.e. those in which the weight of the structure prevents overturning
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses an anti-cracking construction method for an overwintering interlayer of a concrete dam in a severe cold region, which comprises the steps of firstly pouring concrete on a lower layer, pouring concrete on an upper layer poured by the upper part of the lower layer and the upper layer poured by the upper part of the lower layer, arranging horizontal copper water stop and a high-strength geocell on an overwintering intermittent layer between the first poured concrete on the lower layer and the upper layer poured concrete poured on the upper part, performing roughening treatment on the overwintering intermittent layer, and then continuously pouring concrete on the upper layer in the next construction period, wherein the whole construction process is finished. The construction method effectively prevents horizontal cracking and vertical cracks of upper post-cast concrete by arranging the copper water stop and the high-strength geocell on the overwintering intermittent layer, and has the advantages of convenient construction, small investment and good effect.
Description
Technical Field
The invention relates to a concrete dam construction method, in particular to an anti-cracking construction method for an overwintering interlayer of a concrete dam in a severe cold region.
Background
When a roller compacted concrete gravity dam is built in a severe cold area, cracks are generated due to severe weather conditions, namely cold, hot, wind and dry. The cold is that the average temperature per year in a severe cold area is very low, the average temperature per month in winter is below-10 ℃, the cold tide is frequent all the year round, and the temperature difference between day and night is large; "Hot" means that the temperature is high in summer, and the average temperature is about 20 ℃ in summer; wind refers to severe cold areas with strong wind power, strong wind speed and easy evaporation of water; the term "dry" refers to the climate dryness in spring and autumn in alpine regions, and these climate characteristics are extremely unfavorable for the temperature control and crack prevention of roller compacted concrete. The stable temperature of the dam body is low due to low annual average temperature, and the highest temperature of concrete poured in summer is high, so that the temperature difference of the dam foundation is large (often exceeding the specification), and foundation penetrating cracks are often generated due to large temperature difference of the foundation; the cold tide is frequent all the year round, the temperature difference between day and night is large, and the concrete on the upper layer and the lower layer of the pre-cast concrete and the post-cast concrete form a large temperature difference due to the existence of the intermission period, so that horizontal cracks appear, and the concrete on the upper layer of the post-cast concrete generates vertical cracks, thereby causing the water leakage of the dam body. Research shows that the tensile strength between horizontal layers is only 41-86% of that of the original concrete, so that the horizontal cracking phenomenon is easy to form. In engineering practice, the overwintering layer and the long intermittent layer are horizontally cracked and the vertical head-wrapping seam is formed in the upper static dam, the Japanese Yuchuan dam, the Liaoning kwan-yin pavilion dam, the Songyue dam, the Mancheng platform dam, the Hebei peach forest mouth dam, the Iris river mouth dam, the Xinjiang Chong Duan dam and the like of the United states in sequence, so that the water leakage of the dam body is caused, and the problems are urgently solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an anti-cracking construction method for the overwintering layer of a concrete dam in a severe cold region.
In order to solve the problems, the technical scheme adopted by the invention is as follows: an anti-cracking construction method for an overwintering interlayer of a concrete dam in a severe cold region comprises the following steps:
(1) after the lower layer of the pre-cast concrete which is about to enter the wintering period is poured, laying a horizontal copper water stop layer and a geocell on the lower layer of the pre-cast concrete wintering intermittent layer, inserting the lower part of the geocell into the lower layer of the pre-cast concrete, exposing the surface of the lower layer of the pre-cast concrete on the upper part of the geocell, and roughening the wintering intermittent layer before final setting of the lower layer of the pre-cast concrete;
(2) and (5) continuously pouring the upper-layer post-cast concrete in the construction of the next year, and finishing the whole construction process.
The size height of the geocell is more than or equal to 30cm, the size of the geocell is 30cm multiplied by 30cm, and the width is more than or equal to 3 m.
The geocell is buried in the lower layer of the precast concrete and is more than or equal to 15 cm.
The invention has the beneficial effects that: the construction method of the invention effectively prevents horizontal cracking and vertical cracks of upper post-cast concrete by arranging the copper water stop and the geocell on the overwintering intermittent layer, and has convenient construction, small investment and good effect.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments below:
the invention discloses an anti-cracking construction method for an overwintering interlayer of a concrete dam in a severe cold region, which comprises the following steps of:
(1) after the lower layer of the pre-cast concrete which is about to enter the wintering period is poured, laying a horizontal copper water stop layer and a geocell on the lower layer of the pre-cast concrete wintering intermittent layer, wherein the geocell is arranged on the whole wintering layer surface, the lower part of the geocell is inserted into the lower layer of the pre-cast concrete, the upper part of the geocell exposes the surface of the lower layer of the pre-cast concrete, and the lower layer of the pre-cast concrete is roughened before final setting;
(2) and (5) continuously pouring the upper-layer post-cast concrete in the construction of the next year, and finishing the whole construction process.
The size height of the geocell is more than or equal to 30cm, the size of the geocell is 30cm multiplied by 30cm, and the width is more than or equal to 3 m.
The geocell is buried in the lower layer of the precast concrete and is more than or equal to 15 cm.
Specifically, after an upper layer of later-poured concrete is poured on the lower layer of earlier-poured concrete which is intermittently poured in winter, an overwintering intermittent layer which exists between the lower layer of earlier-poured concrete and the upper layer of later-poured concrete is arranged, horizontal copper water stop and a geocell are arranged on the overwintering intermittent layer which is between the lower layer of earlier-poured concrete and the upper layer of later-poured concrete which is poured on the upper layer, the overwintering intermittent layer is subjected to roughening treatment, then the upper layer of later-poured concrete is continuously poured in the next construction period, and the whole construction process is finished.
The intermittence is not limited to the overwintering intermittence, and the intermittence for a period of time comprises the condition that the intermittence time of pouring the upper layer after pouring the concrete on the upper part of the lower layer of the first poured concrete is more than or equal to 15 days.
In the present embodiment, the construction is performed according to the following steps: laying horizontal copper water stop and high-strength geocells on the lower layer of the first-cast concrete overwintering intermittent layer, scouring the overwintering intermittent layer before final setting of the lower layer of the first-cast concrete, pouring concrete after the upper layer of the second-year construction is poured, and finishing the whole construction process. The horizontal copper water stop is used for preventing water leakage between layers when horizontal cracking occurs, after the high-strength geocell arranged on the lower layer of the early-poured concrete overwintering intermittent layer is poured with the later-poured concrete on the upper layer, when the later-poured concrete on the upper layer is in a temperature rise expansion stage, the volume expansion of the later-poured concrete on the upper layer is limited due to the side limiting effect, the expansion deformation of the later-poured concrete on the upper layer in the plane direction is also limited, so that when the later-poured concrete on the upper layer shrinks due to temperature reduction, the shrinkage deformation is coordinated with the deformation of the earlier-poured concrete on the lower layer, the strong constraint effect of the earlier-poured concrete on the upper layer of the later-poured concrete on the lower layer is reduced, the temperature stress is greatly reduced, and the horizontal cracking of the overwintering layer and the long intermittent layer and the vertical head-on seam are effectively prevented.
In a certain project of Xinjiang, a scheme of laying geocells, laying horizontal copper water stop and then pouring upper-layer concrete is adopted on the overwintering layer surface and the long intermittent warehouse surface which is more than 15 days, the existing dam is poured to the top, the combination of the upper layer and the lower layer of the concrete dam body is good through field observation, horizontal cracks of the overwintering layer are basically eliminated, and the horizontal cracks and the vertical split-end cracks of the overwintering layer and the long intermittent layer are effectively prevented.
The above examples are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the scope of the present invention is not limited by the examples, i.e., the equivalent changes or modifications made in the spirit of the present invention disclosed are still within the scope of the present invention.
Claims (3)
1. An anti-cracking construction method for an overwintering interlayer of a concrete dam in a severe cold area is characterized by comprising the following steps:
(1) after the lower layer of the pre-cast concrete which is about to enter the wintering period is poured, laying a horizontal copper water stop layer and a geocell on the lower layer of the pre-cast concrete wintering intermittent layer, inserting the lower part of the geocell into the lower layer of the pre-cast concrete, exposing the surface of the lower layer of the pre-cast concrete on the upper part of the geocell, and roughening the wintering intermittent layer before final setting of the lower layer of the pre-cast concrete;
(2) and (5) continuously pouring the upper-layer post-cast concrete in the construction of the next year, and finishing the whole construction process.
2. The overwintering interlaminar anti-cracking construction method for the concrete dam in the severe cold region as claimed in claim 1, wherein the size height of the geocell is more than or equal to 30cm, the size of the geocell is 30cm x 30cm, and the width of the geocell is more than or equal to 3 m.
3. The anti-cracking construction method for the overwintering interlayer of the concrete dam in the severe cold region as claimed in claim 2, wherein the geocell is buried in the lower layer of the pre-cast concrete for more than or equal to 15 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111132637.2A CN113668542A (en) | 2021-09-26 | 2021-09-26 | Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111132637.2A CN113668542A (en) | 2021-09-26 | 2021-09-26 | Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region |
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| CN202111132637.2A Pending CN113668542A (en) | 2021-09-26 | 2021-09-26 | Anti-cracking construction method for concrete dam overwintering interlayer in severe cold region |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378003A1 (en) * | 2010-04-19 | 2011-10-19 | Dywidag-Systems International GmbH | Assembly for connecting a geoplastic to a stable base |
| CN107542059A (en) * | 2017-09-14 | 2018-01-05 | 张传河 | A kind of method repaired base soil and be lost in buttress |
| CN110593209A (en) * | 2019-09-24 | 2019-12-20 | 中水北方勘测设计研究有限责任公司 | Method for preventing horizontal cracks of overwintering layer of roller compacted concrete dam in severe cold area |
| CN110616618A (en) * | 2019-11-08 | 2019-12-27 | 南通大学 | Reinforced asphalt-based concrete three-dimensional rectangular grid structure and preparation method thereof |
| CN111074717A (en) * | 2020-01-20 | 2020-04-28 | 湖南科技学院 | Perennial frozen soil area airport runway structure and construction method thereof |
| CN112211161A (en) * | 2020-10-27 | 2021-01-12 | 中水北方勘测设计研究有限责任公司 | Method for plugging diversion bottom hole of concrete dam in severe cold area |
-
2021
- 2021-09-26 CN CN202111132637.2A patent/CN113668542A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2378003A1 (en) * | 2010-04-19 | 2011-10-19 | Dywidag-Systems International GmbH | Assembly for connecting a geoplastic to a stable base |
| CN107542059A (en) * | 2017-09-14 | 2018-01-05 | 张传河 | A kind of method repaired base soil and be lost in buttress |
| CN110593209A (en) * | 2019-09-24 | 2019-12-20 | 中水北方勘测设计研究有限责任公司 | Method for preventing horizontal cracks of overwintering layer of roller compacted concrete dam in severe cold area |
| CN110616618A (en) * | 2019-11-08 | 2019-12-27 | 南通大学 | Reinforced asphalt-based concrete three-dimensional rectangular grid structure and preparation method thereof |
| CN111074717A (en) * | 2020-01-20 | 2020-04-28 | 湖南科技学院 | Perennial frozen soil area airport runway structure and construction method thereof |
| CN112211161A (en) * | 2020-10-27 | 2021-01-12 | 中水北方勘测设计研究有限责任公司 | Method for plugging diversion bottom hole of concrete dam in severe cold area |
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Application publication date: 20211119 |
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