CN111794180B - Construction method of cemented sand gravel dam - Google Patents
Construction method of cemented sand gravel dam Download PDFInfo
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- CN111794180B CN111794180B CN202010673855.6A CN202010673855A CN111794180B CN 111794180 B CN111794180 B CN 111794180B CN 202010673855 A CN202010673855 A CN 202010673855A CN 111794180 B CN111794180 B CN 111794180B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Abstract
The invention discloses a construction method of a cemented sand gravel dam, belonging to the novel damming field of hydraulic and hydroelectric engineering, comprising the following steps: s1: constructing a foundation cushion layer; s2: paving an inner rolling layer of the dam, paving an impermeable layer of the dam surface at the same time, and enabling the height of the impermeable layer of the dam surface to be lower than that of the inner rolling layer of the dam S3: carrying out rolling construction on a rolling layer in the dam, and carrying out vibration construction on an impermeable layer on the dam surface; s4: performing roughening treatment on the surface of the dam surface impermeable layer; s5: and repeating the steps S2 to S4 until the whole dam construction is completed, wherein the construction method is simple and operable, not only enhances the seepage-proofing performance of the cemented gravel dam, but also forms a complete and closed seepage-proofing system.
Description
Technical Field
The invention relates to the field of novel dam construction of hydraulic and hydroelectric engineering, in particular to a construction method of a cemented sand gravel dam.
Background
The cemented gravel dam is a novel damming technology and is widely applied to medium and small-sized hydraulic engineering at home and abroad at present. The damming material of the cemented dam is characterized in that sand gravel materials in the engineering site are fully adopted, and a small amount of cementing materials are added for rolling or vibrating construction. The strength of the cemented gravel material of the dam body part is usually lower than C10, the durability of the dam does not depend on the cemented gravel material inside the dam body, and the requirement of the dam body on the durability of seepage prevention is mainly reflected by the seepage prevention layer of the dam surface of the cemented gravel dam. Therefore, the seepage-proofing effect of the dam surface seepage-proofing layer directly determines the operation safety of the dam.
The existing dam internal cemented sand gravel is mostly constructed by rolling, and the dam surface impervious layer is mostly constructed by vibration. In the existing dam body construction process, a dam face impermeable layer and a dam internal rolling layer rise synchronously, after rising to the same height and the same horizontal plane, construction of the next layer is continued at certain time intervals (construction organization and other factor intervals), at the moment, the dam face impermeable layer and the dam internal rolling layer of the same layer are in the same plane, if the dam face impermeable layer and the upper layer and the lower layer of the dam internal rolling layer are not well combined, a water seepage channel which is not blocked is easy to form, and great influence is caused on the construction quality of a dam. Because the upstream face and the dam body rise synchronously, the time interval in the construction process can cause that construction cold joints are easy to form between different faces. The conventional method for treating the surface of the impermeable layer is to use a high-pressure water gun to flush. When the method is used for construction of the cemented sand gravel dam, the bedding surface of the cemented dam is greatly damaged, small stones and mortar rushed out are difficult to treat, the manual treatment in the bedding surface scouring process is time-consuming and labor-consuming, and the construction quality and progress of the dam are seriously influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a construction method of a cemented sand gravel dam to solve the problems of poor seepage-proofing performance and inconvenient bedding surface treatment of the cemented sand gravel dam, and the specific technical scheme is as follows:
a construction method of a cemented gravel dam sequentially comprises the following steps:
s1: constructing a foundation cushion layer on the dam foundation;
s2: paving cemented gravel to form a rolling layer in the dam, paving stones on two sides of the rolling layer in the dam to form an impermeable layer on the dam surface, and making the height of the impermeable layer on the dam surface lower than that of the rolling layer in the dam,
s3: carrying out rolling construction on a rolling layer in the dam, and carrying out vibration construction on an impermeable layer on the dam surface;
s4: performing scouring treatment on the layer surface of the dam surface impervious layer through a layer surface treatment device;
s5: and repeating the steps S2 to S4 until the whole dam construction is completed.
Preferably, the foundation mat in step S1 is subjected to a rolling process using rich cementitious gravel and sprayed with a cement paste to perform mat face treatment.
Preferably, the height of the dam inner rolling layer in the step S2 is the height of the dam inner rolling layer after the rolling construction is completed.
The invention ensures that the height of each layer of the dam surface impervious layer is lower than that of each layer of the dam internal rolling layer, and effectively solves the problem that water leaked into the bonding layer of the adjacent dam surface impervious layer easily directly enters the interior of a dam body through the bonding layer of the dam internal rolling layer because the bonding surfaces of the internal rolling layer and the dam surface impervious layer of each layer of the existing cemented gravel dam are positioned on the same horizontal plane.
Preferably, the height of the dam surface impervious layer in the step S2 is 5-10cm lower than the height of the rolled layer in the dam of the same-layer cementing dam.
Preferably, the dam surface impervious layer and the rolling layer in the cemented dam are constructed synchronously in the step S2.
The invention constructs the impervious layer of the dam surface and the rolling layer in the cemented dam synchronously, shortens the construction period and improves the construction efficiency of the invention.
Preferably, in step S3, the vibration construction is performed on the rolling-compaction-missing part of the rolling layer in the dam of the cemented dam while the vibration construction is performed on the dam surface impervious layer.
When the impermeable layer of the dam surface is vibrated, the vibration construction is carried out on the place where the rolling layer in the cemented dam can not be rolled, namely the rolling missing place, so as to improve the compactness of the whole dam body.
Preferably, the layer processing device in step S4 includes a pressing plate, a plurality of pressing pins disposed at a bottom end of the pressing plate and slidably connected to the pressing plate, nuts disposed at outer sides of the pressing pins, and evasive springs disposed between the pressing plate and the nuts and sleeved at outer sides of the pressing pins.
According to the invention, the constructor carries out layer treatment on the dam surface impervious layer by using the layer treatment device, the damage to the dam surface impervious layer with lower strength is small in the layer treatment process, the splashing of small stones, mortar and the like can not occur in the treatment process, meanwhile, the use method is simple and convenient for the constructor to master, the construction time is saved, and the labor intensity of the constructor is reduced.
Preferably, the press nails are arranged on the press plate in a staggered mode.
The invention arranges the pressing nails on the pressing plate in a staggered way so as to close the water seepage channels on the impervious barrier of the dam surface as much as possible.
Preferably, the top end of the pressure plate is provided with a connecting rod, and the connecting rod is provided with a handle.
The cemented gravel dam comprises a foundation bed course, a dam inner rolling layer arranged on the foundation bed course and a dam surface impermeable layer arranged on the side face of the dam inner rolling layer, wherein the height of the dam surface impermeable layer is lower than that of the dam inner rolling layer.
The invention has the following beneficial effects:
the cemented gravel dam comprises an inner rolling layer and a dam face impermeable layer, wherein the inner dam body and the dam face impermeable layer of the cemented dam are sequentially paved and stacked from bottom to top. When each layer of dam internal rolling layer and each layer of dam surface impervious layer are synchronously constructed, the height of each layer of dam surface impervious layer is lower than that of each layer of dam internal rolling layer, when a second layer of dam surface impervious layer and a dam internal rolling layer are constructed, the mixture of the second layer of dam surface impervious layer is filled in the part of the dam surface impervious layer lower than the dam internal rolling layer, and the combination layer surface of the adjacent dam surface impervious layer and the combination layer surface of the adjacent dam internal rolling layer of the same layer are positioned on different planes, so that a zigzag connection line type water seepage blocking path is formed inside the cemented gravel dam. According to the invention, the zigzag connection type water seepage blocking path is additionally arranged in the cemented sand gravel dam, when water seepage occurs at the combined layer surface of the seepage-proof layers of the adjacent dam surfaces, the water seeping into the combined layer surface reaches the internal rolling layer part of the dam and is blocked by the internal rolling layer of the dam, and the problem that the water seeping into the combined layer surface of the seepage-proof layers of the adjacent dam surfaces easily directly enters the interior of the dam body through the combined layer surface of the internal rolling layer of the dam and the seepage-proof layer of the dam surface because the combined surface of the internal rolling layer of each layer of the dam and the seepage-proof layer of the dam surface is in the same horizontal plane in the existing cemented sand gravel dam is effectively solved. The construction method is simple and operable, not only enhances the seepage-proofing performance of the cemented gravel dam, but also achieves the effect of three-dimensional seepage-proofing.
Drawings
FIG. 1 is a cross-sectional view of a cemented gravel dam according to an embodiment of a method of constructing a cemented gravel dam;
FIG. 2 is a schematic structural diagram of a layer processing apparatus according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic view showing the distribution of the press pins of the layer processing apparatus according to the present invention.
In the figure: 1-a base mat layer; 2-rolling the layer in the dam; 3-dam surface impervious layer; 4-a layer processing device; 5-rolling the layer in the next dam; 6-the impervious barrier of the next dam surface; 41-a pressing plate; 42-pressing nails; 421-sealing water thread; 43-a nut; 44-an avoidance spring; 45-connecting rod; 46-handle.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "communicating," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
As shown in fig. 1 to 4, the cemented gravel dam comprises an internal rolling layer and an impermeable layer, which are sequentially laid from bottom to top. The invention provides a construction method of a cemented sand gravel dam based on the cemented sand gravel dam, which sequentially comprises the following steps:
s1: constructing a foundation cushion layer 1 of a rolling layer in the dam on a dam foundation, wherein in the process of constructing the foundation cushion layer 1, constructors adopt slurry-rich cemented particles with the thickness of 0.8-1.0m and the maximum particle size of 80mm to perform seepage-proofing rolling construction, and perform cushion surface treatment by matching with sealed impervious self-flowing clean slurry after rolling.
S2: paving cemented sand and gravel materials on the basis of the foundation cushion layer 1 in the step S1 to form a dam internal rolling layer 2, paving stone materials on two sides of the dam internal rolling layer 2 to form a dam surface impermeable layer 3, and enabling the height of the dam surface impermeable layer 3 to be 8cm lower than the height of the dam internal rolling layer 2 which is calculated in advance and is subjected to rolling construction, wherein in other embodiments, the height difference can be 5cm or 10 cm;
the impervious layer 3 on the dam surface and the rolling layer 2 in the dam are constructed synchronously, so that the construction period is shortened, and the construction efficiency of the dam is improved.
S3: and (5) after the pouring construction of the dam inner rolling layer 2 in the step S2 is completed, performing rolling construction on the dam inner rolling layer 2, and performing vibration construction on the dam surface impermeable layer 3. And (3) vibrating the impermeable layer 3 on the dam surface, and simultaneously vibrating the positions where the rolling layer 2 in the dam cannot be rolled, namely the positions where rolling is lacked, so as to improve the compactness of the whole dam body.
S4: after the dam surface impervious layer 3 in the step S3 is constructed, when constructors measure the mortar penetration resistance at 4MPa through a concrete penetration resistance instrument, the mixture does not reach the initial setting time and is relatively close to the initial setting, but has certain strength, and the implementation work of the next layer surface treatment device 4 is facilitated. Constructors carry out the scouring treatment on the layer surface of the dam surface impervious layer 3 through the layer surface treatment device 4 so as to replace the prior high-pressure water gun scouring treatment;
for the layer surface treatment of the impervious layer, the method suggested by the existing specification mostly adopts a high-pressure water gun to scour the hair, but the method is not suitable for being well popularized and applied in the cemented sand gravel dam, the reason is that the cemented sand gravel impervious layer adopts rich slurry cemented sand gravel, a large amount of fly ash is used, the early strength is low, the scouring time is not suitable to be controlled, the high-pressure water gun has large damage to the layer surface with low strength, the scoured small stones, mortar and the like are also inconvenient to treat, and the site workers in the layer surface scouring process are not suitable to master, consume time and consume labor.
The bedding surface processing device 4 comprises a pressing plate 41 made of steel and a plurality of pressing nails 42 arranged at the bottom end of the pressing plate 41 and slidably connected with the pressing plate 41, wherein the size of the pressing plate is 15cm x 15cm, the thickness of the pressing plate is 10mm, the pressing nails 42 are 1cm in diameter, 5cm in length and are provided with spiral threads on the outer sides. The pressing nails 42 are arranged on the pressing plate 41 in a staggered way to close the water seepage channels on the impermeable layer 3 of the dam face as much as possible. Meanwhile, the top end of the pressing plate 41 is provided with a connecting rod 45 with the length of 1m, a handle 46 convenient for operation of constructors is arranged on the connecting rod 45, the bottom end of the pressing nail 42 is provided with a water sealing thread 421, and the pressing nail 42 is convenient to press and increase the combination degree of the upper layer and the lower layer simultaneously by utilizing the sealing principle of a threaded cover.
The invention is convenient for constructors to replace the press nails 42 through the matching of the nuts 43 and the evading springs 44, and when the press nails 42 touch stones in the impervious layer of the dam surface and cannot be inserted, the press nails 42 can retract into the press plate 41 without interfering other press nails 42 to be inserted into a mixture. When there is no obstacle at the bottom end of the press pin 42, the escape spring 44 can return the press pin 42 to the initial position according to its own elastic force. According to the invention, the constructor carries out layer treatment on the dam surface impervious layer by using the layer treatment device 4, the damage to the dam surface impervious layer with lower strength is small in the layer treatment process, and the splashing of small stones, mortar and the like can not occur in the treatment process.
S5: after the layer treatment in the step S4 is completed, paving cemented gravel and stones on the internal rolling layer 2 of the dam to form a next internal rolling layer 5 of the dam, paving stones on the impervious layer 3 of the dam surface to form a next impervious layer 6 of the dam surface, and enabling the height of the next impervious layer 6 of the dam surface to be 8cm lower than the height of the next internal rolling layer 5 of the dam which is calculated in advance and has completed the rolling construction; the next dam surface impervious layer 6 and the next dam internal rolling layer 5 are constructed synchronously, so that the construction period is further shortened, and the construction efficiency is improved.
S6: after the pouring construction of the next dam inner rolling layer 5 in the step S5 is completed, rolling construction is carried out on the next dam inner rolling layer 5, and vibration construction is carried out on the next dam surface impermeable layer 6; and when the next dam surface impervious layer 6 is vibrated, vibrating construction is carried out on the place where the next dam internal rolling layer 5 can not be rolled, namely the rolling missing place, so that the compactness of the whole dam body is further improved.
S7: and repeating the steps S4 to S6 until the whole dam construction is completed.
The cemented gravel dam comprises a foundation cushion layer 1, a dam inner rolling layer 2 arranged on the foundation cushion layer 1 and a dam face impermeable layer 3 arranged on the side face of the dam inner rolling layer 2, wherein the height of the dam face impermeable layer 3 is lower than that of the dam inner rolling layer 2.
When the invention constructs the dam internal rolling layer and the dam surface impervious layer of each layer synchronously, the height of the dam surface impervious layer of each layer is lower than that of the dam internal rolling layer of each layer, when the next dam surface impervious layer 6 and the dam internal rolling layer are constructed, the mixture of the next dam surface impervious layer 6 fills the part of the dam surface impervious layer 3 lower than the dam internal rolling layer 2, and the combination layer surface of the adjacent dam surface impervious layer of the same layer and the combination layer surface of the adjacent dam internal rolling layer are positioned on different planes, thereby forming a water seepage blocking path of a zigzag connecting line type in the cemented gravel dam. According to the invention, the zigzag connection type water seepage blocking path is additionally arranged in the cemented sand gravel dam, when water seepage occurs at the combined layer surface of the seepage-proof layers of the adjacent dam surfaces, the water seeping into the combined layer surface reaches the internal rolling layer part of the dam and is blocked by the internal rolling layer of the dam, and the problem that the water seeping into the combined layer surface of the seepage-proof layers of the adjacent dam surfaces easily directly enters the interior of the dam body through the combined layer surface of the internal rolling layer of the dam and the seepage-proof layer of the dam surface because the combined surface of the internal rolling layer of each layer of the dam and the seepage-proof layer of the dam surface is in the same plane in the existing cemented sand gravel dam is effectively solved. The construction method is simple and operable, not only enhances the seepage-proofing performance of the cemented gravel dam, but also achieves the effect of three-dimensional seepage-proofing.
It is to be noted that, in this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover a non-exclusive inclusion, so that an article or apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A construction method of a cemented gravel dam is characterized by sequentially comprising the following steps:
s1: constructing a foundation cushion (1) on a dam foundation;
s2: paving cemented sand gravel materials to form a dam inner rolling layer (2), paving stones on two sides of the dam inner rolling layer (2) to form a dam surface impermeable layer (3), and enabling the height of the dam surface impermeable layer (3) to be lower than that of the dam inner rolling layer (2);
s3: carrying out rolling construction on the rolling layer (2) in the dam, and carrying out vibration construction on the impervious layer (3) on the dam surface;
s4: performing scouring treatment on the layer surface of the dam surface impervious layer (3) through a layer surface treatment device (4);
s5: repeating the steps S2 to S4 until the whole dam construction is completed;
the layer processing device (4) in the step S4 comprises a pressing plate (41), a plurality of pressing nails (42) which are arranged at the bottom end of the pressing plate (41) and are in sliding connection with the pressing plate (41), nuts (43) which are arranged on the outer sides of the pressing nails (42), and avoidance springs (44) which are sleeved on the outer sides of the pressing nails (42) and are positioned between the pressing plate (41) and the nuts (43); the pressing nails (42) are arranged on the pressing plate (41) in a staggered mode.
2. A method of constructing a cementitious gravel dam as claimed in claim 1 wherein the foundation pad (1) of step S1 is laminated using slurry-rich cemented gravel material and the pad face treatment is carried out by spraying a cement paste.
3. A method of constructing a cemented gravel dam according to claim 1, wherein the height of the in-dam crush at step S2 is the height of the in-dam crush at which the crush has been completed.
4. The method of claim 3, wherein the height of the barrier layer at the dam face in step S2 is 5-10cm lower than the height of the rolled layer in the same layer of cemented gravel dam.
5. The method of constructing a cemented gravel dam of claim 1, wherein the step S2 is performed simultaneously with the step of applying a dam facing impermeable layer and a roll layer inside the cemented dam.
6. The method of claim 1, wherein in step S3, the step of vibrating is performed on the impermeable layer of the dam face, and simultaneously the step of vibrating is performed on the rolling defects of the rolling layer in the cemented dam.
7. A method of constructing a cementitious gravel dam as claimed in claim 1 wherein the top end of the pressure plate (41) is provided with a connecting rod (45) and the connecting rod (45) is provided with a handle (46).
8. A cemented gravel dam obtained by the construction method according to any one of claims 1 to 7, comprising a foundation mat (1), an in-dam rolling layer (2) disposed on the foundation mat (1), and a dam facing barrier layer (3) disposed on the side of the in-dam rolling layer (2), wherein the height of the dam facing barrier layer (3) is lower than that of the in-dam rolling layer (2).
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| CN202010673855.6A CN111794180B (en) | 2020-07-14 | 2020-07-14 | Construction method of cemented sand gravel dam |
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| CN202010673855.6A CN111794180B (en) | 2020-07-14 | 2020-07-14 | Construction method of cemented sand gravel dam |
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| CN108018830A (en) * | 2017-12-07 | 2018-05-11 | 四川大学 | A kind of gravity type cemented gravel dam and its construction method |
| CN208869941U (en) * | 2018-07-23 | 2019-05-17 | 呼和浩特市政公路工程有限责任公司 | A kind of airborne concrete dabbing device |
| CN110847125A (en) * | 2019-12-04 | 2020-02-28 | 中国水利水电科学研究院 | Seepage-proofing construction method for dam body of cemented sand gravel dam built on sand gravel foundation |
| CN210161438U (en) * | 2019-05-09 | 2020-03-20 | 孙齐 | Concrete face chisel hair device for civil engineering |
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| JP2009121119A (en) * | 2007-11-14 | 2009-06-04 | Shimizu Corp | Bank material carrying method and carrying apparatus |
| CN205914202U (en) * | 2016-06-21 | 2017-02-01 | 湖北省赤壁市合力铸造机械有限公司 | Crusher hammer with secondary crushing function |
| CN108018830A (en) * | 2017-12-07 | 2018-05-11 | 四川大学 | A kind of gravity type cemented gravel dam and its construction method |
| CN208869941U (en) * | 2018-07-23 | 2019-05-17 | 呼和浩特市政公路工程有限责任公司 | A kind of airborne concrete dabbing device |
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| CN110847125A (en) * | 2019-12-04 | 2020-02-28 | 中国水利水电科学研究院 | Seepage-proofing construction method for dam body of cemented sand gravel dam built on sand gravel foundation |
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| CN111794180A (en) | 2020-10-20 |
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