CN114991152A - Construction method for pouring normal concrete and roller compacted concrete on overflow surface of dam - Google Patents
Construction method for pouring normal concrete and roller compacted concrete on overflow surface of dam Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 245
- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 84
- 238000010276 construction Methods 0.000 title claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 12
- 239000002023 wood Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 4
- 230000029052 metamorphosis Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000008520 organization Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 equipment resources Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 241000357293 Leptobrama muelleri Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a construction method for pouring normal concrete and roller compacted concrete on an overflow surface of a dam. The method comprises the following steps: firstly, binding, installing and welding overflow surface structural steel bars and concrete collection surface sample frame steel bars; binding a precast block with strength grade not lower than that of impact-resistant and wear-resistant concrete on the overflow surface structural steel bar, and then starting to install a template; and (5) pouring construction of dam roller compacted concrete and overflow surface anti-impact wear-resistant concrete is carried out after the washed bin number. According to the construction method, the initial setting time and the final setting time of the roller compacted concrete and the normal concrete are accurately controlled by optimizing the mixing proportion of the concrete, the pouring sequence of the roller compacted concrete and the normal concrete is adjusted, and the construction method of synchronously pouring the normal anti-impact wear-resistant concrete of the overflow surface and the roller compacted concrete of the dam is adopted, so that a large amount of labor, time, materials, equipment resources and water and electricity resources are saved, the construction period is shortened on the premise of ensuring the concrete pouring quality, and the construction cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of hydraulic and hydroelectric engineering construction, particularly belongs to the technical field of dam construction in hydraulic and hydroelectric engineering, and particularly relates to a construction method for synchronously pouring normal concrete and roller compacted concrete on an overflow surface of a dam.
Background
The roller compacted concrete damming technology is a new damming technology developed internationally in the late 80 s of the 20 th century, adopts dry lean concrete for filling in the interior of a gravity dam body with a method similar to filling construction of an earth-rock dam, has the advantages of less cement consumption, low hydration heat, high construction speed, convenience for mechanical construction and modernization management and the like, is a novel concrete construction technology, and is vigorously developed and widely applied in the world dam construction.
In the existing construction of a dam or an overflow dam section, which relates to roller compacted concrete and has an overflow surface of impact-resistant and wear-resistant concrete, the roller compacted concrete part of the dam body is integrally formed and then the construction of the overflow surface of the impact-resistant and wear-resistant concrete is carried out.
The specific construction process comprises the following steps: construction layout (base face treatment) of a roller compacted concrete pouring area → reinforcement → formwork erection and water stop installation → acceptance of a warehouse face → concrete mixing → concrete pouring → collection of the warehouse → protection and maintenance behind the collection of the face → roughening of a joint face → reinforcement → formwork erection and water stop installation → acceptance of the warehouse face → concrete mixing → concrete pouring → collection of the warehouse → protection and maintenance behind the collection of the face.
The existing method has the defects that the main body and the overflow surface concrete are separately poured: compared with the synchronous ascending pouring of the overflow surface and the main body concrete, the separate pouring needs to respectively erect the mold during the main body rolled concrete pouring and the overflow surface concrete pouring, and the mold erecting of the overflow surface concrete pouring is realized because the template is erected on the formed main body dam, so that the sliding mold phenomenon is easy to occur, and the pouring quality of the overflow surface concrete is influenced. In addition, a large amount of chiseling work needs to be done before the concrete of the overflow surface is poured, a large amount of manpower and resources need to be consumed, and the construction period is not favorable.
Disclosure of Invention
The invention discloses a construction method for pouring normal concrete and roller compacted concrete on an overflow surface of a dam. The invention aims to provide a dam or overflow dam section engineering construction technology which is suitable for main concrete of roller compacted concrete and overflow surface of normal-state impact-resistant and abrasion-resistant concrete.
The invention is realized by the following technical scheme:
a dam overflow surface normal state and roller compacted concrete pouring construction method is used for dam or overflow dam section engineering construction with main concrete being roller compacted concrete and overflow surface being anti-impact wear-resistant concrete, and is characterized in that: dividing dam or overflow dam section into impervious concrete (R1), roller compacted concrete (R2), metamorphosis concrete (R2gev), normal concrete (C2) and impact-resistant and wear-resistant concrete (C3) according to the cross section from top to bottom; the pouring comprises the following process steps: firstly, binding, installing and welding overflow surface structural steel bars and concrete surface sample collecting frame steel bars; binding a precast block with strength grade not lower than that of impact-resistant and wear-resistant concrete on the overflow surface structural steel bar, and then starting to install a template; pouring construction of dam roller compacted concrete and overflow surface anti-impact wear-resistant concrete is carried out after the flushed bin number;
the procedure is as follows: paving the roller compacted concrete of the dam body to a downstream sideline; pouring metamorphic concrete within the range of 50cm at the downstream side of the roller compacted concrete; normal concrete on the downstream side of the metamorphic concrete is put into a bin; putting the impact-resistant and wear-resistant concrete into a warehouse; vibrating normal concrete and impact-resistant and wear-resistant concrete; rolling the combination part of the roller compacted concrete and the abnormal concrete and the normal concrete;
pouring and lifting construction of overflow surface impact-resistant and wear-resistant concrete and dam roller compacted concrete synchronously; the pouring of normal concrete and impact-resistant and abrasion-resistant concrete on the downstream side of the dam is delayed by 1-1.5 layers of roller compacted concrete and metamorphic concrete of the dam body, and the layer thickness is 30-45 cm.
In the construction of the invention, the impervious concrete (R1) adopts a secondary composition, and the strength is 20 Mpa; the roller compacted concrete (R2) adopts three-grade composition, and the strength is 16 Mpa; the metamorphic concrete (R2gev) adopts three grades, and the strength is 16 Mpa; the normal concrete (C2) adopts secondary composition, and the strength is 16 Mpa; the impact-resistant and wear-resistant concrete (C3) adopts a secondary composition, has the strength of 35Mpa and the thickness of not less than 50 cm.
The construction method of the invention further comprises the following process steps:
s1, mounting and welding overflow surface structural steel bars;
installing and welding spillway steel bars and concrete collecting sample frame steel bars in a layered and segmented manner according to a dam spillway steel bar graph;
s2, mounting the precast block;
installing a template from the horizontal section elevation slope raising circular arc section of the spillway to pour; in order to support the template, placing a concrete precast block between the structural steel bar and the template, wherein the size of the concrete precast block is 10cm multiplied by 10cm, and the concrete precast block is connected with the structural steel bar by a binding wire, and the strength grade of the precast block is not lower than that of the impact-resistant and wear-resistant concrete; arranging the prefabricated blocks at joints of the template blocks;
s3, installing a template;
the horizontal section of the overflow surface does not need a template; the overflow surface arc section is constructed by adopting a combined steel mould, the local part is supplemented by adopting a wood template, flexible anchor bars and conical nuts required by the cantilever template can be pre-embedded, and the star pursuing nut is accurately positioned and controlled on a horizontal line; the slope section of the overflow surface adopts a cantilever template, and the local part adopts a combined steel mould and a wood template for supplement; the overflow surface transition section is completely supplemented by adopting a combined steel mould and partially supplemented by adopting a wood template;
s4, constructing the anti-impact wear-resistant concrete of the spillway flat section;
in the spillway flat section, after normal concrete pouring is finished, construction of anti-impact wear-resistant concrete is started, vibration is carried out by using a vibrating rod, and vibration is assisted by using a flexible shaft vibrating rod; in order to ensure the flatness of the recovered surface, the top of the flat section is welded with recovered surface sample frame ribs in an elevation mode, the recovered surface sample frame ribs are made of round steel, the distance between the recovered surface sample frame ribs and the overflow surface structural steel bars is 1.5m, the recovered surface sample frame ribs are used as recovered surface rails of scraped surface steel bars, the recovered surface can be directly performed by sliding the scraped surface steel bars back and forth on the smeared surface sample frame ribs or rolling the scraped surface sample frame ribs on phi 108 steel pipes, and then manual surface recovery is performed simultaneously; and cutting off the sample frame ribs after finishing the surface collection, and collecting the surface of the concrete damaged by cutting off the sample frame ribs again.
S5, pouring concrete on the slope section of the overflow surface;
paving roller compacted concrete of a dam body to a downstream side line of the roller compacted concrete, cutting out distorted concrete within 50cm of the downstream side, adding cement and fly ash slurry, and compacting the partial roller compacted concrete by adopting a vibrating rod after adding the cement and the fly ash slurry; then normal concrete is put into a bin, a hydraulic backhoe or a leveling machine is used for paving, and the normal concrete and the roller compacted concrete are both poured layer by adopting small steps with the thickness of 30-45 cm; after normal concrete is poured to the upstream side line of the anti-impact wear-resistant concrete, the anti-impact wear-resistant concrete with the overflow surface thickness not less than 50cm is placed into a bin, a vibrating rod is used for vibrating after the bin is leveled, a flexible shaft vibrating rod is used for assisting in vibrating, and vibrating of the normal concrete, the anti-impact wear-resistant concrete and the abnormal concrete is completed; finally, finishing the rolling of the combination part of the roller compacted concrete and the abnormal concrete and the normal concrete;
s6, protecting and curing concrete;
the new concrete which is just received is covered with a heat insulation material in time for protection; spraying water and curing in time after the concrete pouring is finished to keep the concrete surface moist; and (4) adopting wet coarse linen for covering or adopting a perforated pipe constant flow water mode for uninterrupted maintenance, wherein the maintenance time is not less than 28 days.
S7, removing the template;
after the pouring of the anti-impact wear-resistant concrete is finished, after 8-12 hours in summer and 24-30 hours in winter, the cantilever formwork or the combined steel mould of the overflow surface starts to be dismantled, and the next concrete pouring lift is prepared.
According to the invention, on the premise of ensuring that the concrete strength meets the design requirement, the initial setting time and the final setting time of the roller compacted concrete and the normal concrete are controlled by adjusting and optimizing the mixing proportion of the concrete, and the pouring sequence of the roller compacted concrete and the normal concrete is reasonably designed on a construction site, so that the synchronous ascending pouring construction of the normal impact-resistant and wear-resistant concrete of the overflow surface and the roller compacted concrete of the dam is realized.
According to different characteristics of the roller compacted concrete and normal concrete, including different water content, cement content, setting time and the like, the pouring of the normal concrete and the overflow surface anti-impact wear-resistant concrete on the downstream side of the dam is delayed slightly by 1-1.5 layers of the roller compacted concrete and the abnormal concrete of the dam body, wherein the layer thickness is 30-45 cm, and the pouring quality and efficiency of the dam are further improved.
Compared with the prior construction method, the construction method has the following advantages:
the invention comprises the following steps: optimizing the mixing proportion of the concrete, and accurately controlling the initial setting time and the final setting time of the roller compacted concrete and the normal concrete; optimizing a site construction organization, and adjusting the pouring sequence of the roller compacted concrete and the normal concrete; the construction method is implemented by synchronously pouring normal-state impact-resistant and wear-resistant concrete of an overflow surface and roller compacted concrete of a dam. The method saves a large amount of labor, time, materials, equipment resources, water and electricity resources and the like, shortens the construction period of the project on the premise of ensuring the concrete pouring quality, and greatly reduces the construction cost. The construction method ensures the quality of concrete pouring, and because the anti-impact wear-resistant concrete and the normal concrete are synchronously poured, the two concretes can be better combined, thereby reducing the quality hidden trouble in the aspect of concrete joint surface combination when the anti-impact wear-resistant concrete is poured in the second stage; the construction period is shortened: the time for secondary installation and removal of the template, secondary concrete roughening treatment, bin number washing and acceptance inspection is reduced, and the construction period is shortened; construction cost is reduced: the application and installation of manpower and materials such as steel templates, frame pipes, wooden templates, die-drawing ribs, electric welding rods, screws, screw caps, lead wires and the like required by secondary installation of the templates are reduced, and the use amount of manpower, wool-washing machine equipment and hydroelectric resources for rough surface treatment required by secondary concrete pouring is reduced.
Drawings
FIG. 1 is a process flow diagram of the construction method of the present invention;
FIG. 2 is a typical cross section of an overflow dam section of a dam according to an embodiment of the present invention;
FIG. 3 is a diagram of a dam concrete partition;
fig. 4 is a cross-sectional view of a flood plane.
In the figure, C2 is normal concrete, C3 is impact-resistant and wear-resistant concrete, R1 is impervious concrete, R2 is roller compacted concrete, and R2gev is modified concrete.
Detailed Description
The present invention is further described below in conjunction with the following detailed description which is further illustrative of the principles of the present invention and is not intended to limit the invention in any way, nor is it intended that the invention be limited to the same or similar techniques.
With reference to the attached drawings.
As shown in fig. 1, the construction method of the invention adopts a construction process of synchronous rising pouring of overflow surface impact-resistant and abrasion-resistant concrete C3 and an RCC roller compacted concrete dam main body, and firstly, binding, installing and welding overflow surface structural steel bars and concrete collection surface sample frame steel bars; binding a precast block with the strength grade not lower than that of impact-resistant and wear-resistant concrete C3 on the structural steel bars of the overflow surface, and then starting to install a template, wherein the template is mainly used for the slope section of the overflow surface, and the horizontal section of the overflow surface does not need a template; the pouring construction of the roller compacted concrete of the dam and the anti-impact wear-resistant concrete of the overflow surface is carried out after the washed bin number, and the concrete procedures are as follows: paving the roller compacted concrete R2 of the dam body to a downstream sideline; pouring modified concrete R2gev within 50cm of the downstream side of the roller compacted concrete R2, wherein the pouring comprises slotting, grouting and vibrating; normal concrete C2 on the downstream side of the metamorphic concrete R2gev is put into a bin; putting impact-resistant and wear-resistant concrete C3 into a warehouse; vibrating normal concrete C2 and impact-resistant and wear-resistant concrete C3; and (3) rolling the combination part of the roller compacted concrete R2 and the modified concrete R2gev and the normal concrete C2. The construction process flow of synchronous rising pouring of the overflow surface anti-impact wear-resistant concrete and the RCC roller compacted concrete dam body is shown in figure 1.
According to the invention, on the premise of ensuring that the concrete strength meets the design requirement, the initial setting time and the final setting time of the roller compacted concrete and the normal concrete are controlled by adjusting and optimizing the mixing proportion of the concrete, the pouring sequence of the roller compacted concrete and the normal concrete is reasonably designed on a construction site, and the overflow surface normal impact-resistant wear-resistant concrete C3 and the dam roller compacted concrete R2 are synchronously lifted for construction and pouring.
According to different characteristics of the roller compacted concrete and normal concrete, including different water content, cement content and setting time, the pouring of the normal concrete C2 and the overflow surface anti-impact wear-resistant concrete C3 on the downstream side of the dam is slightly delayed by 1-1.5 layers of the roller compacted concrete R2 and the abnormal concrete R2gev, so that the dam pouring quality and efficiency are further improved; the thickness of the setting layer in the dam pouring process is 30 cm-45 cm. The dam concrete partition is shown in fig. 3.
The concrete steps of the process of the invention will be described below with reference to the construction of a dam according to a specific embodiment.
S1, mounting and welding overflow surface structural steel bars;
according to a dam spillway reinforcing steel bar graph, the spillway reinforcing steel bars and concrete surface collecting sample frame reinforcing steel bars are installed and welded in a layered and segmented mode, the reinforcing steel bars must be processed according to the design size strictly, measuring and point placing positioning is needed before and after installation, and installation accuracy is guaranteed.
S2, mounting the precast block;
and (3) installing a template to cast the arc section with the slope rising from the height EL.674.0m of the horizontal section of the spillway. In order to support the template, a concrete precast block with the size of 10cm multiplied by 10cm is arranged between the structural steel bar and the template, and the binding wire is connected with the structural steel bar, so that the strength grade is not lower than that of the impact-resistant and wear-resistant concrete C3. The prefabricated blocks are arranged at the joints of the template blocks, and the requirements of combining steel molds or cantilever templates can be met simultaneously.
S3, installing a template;
the elevation of the horizontal section of the overflow surface is EL.674.0m, and no template is needed for the construction of the impact-resistant and wear-resistant concrete with the elevation; the overflow surface EL.674.00m-EL.683.71m is an arc with the radius of 20m, combined steel dies (1015 and 2015 combined steel dies) are adopted for construction in the range, a wood template with the thickness of 2.5cm is locally adopted for supplement, flexible anchor bars and conical nuts required by a cantilever template are embedded in advance before the steel template is poured to the EL.683.71m, and all star-chasing nuts need to be accurately positioned and controlled on a horizontal line; the overflow surface EL.683.71m-EL.736.0m is 1: the slope section of 0.6 is completely supplemented by adopting cantilever templates and locally adopting combined steel molds and wood templates with the thickness of 2.5 cm; the overflow surface EL.736.0m-EL.750.4m is a gradual change section, and is supplemented by adopting combined steel dies (1015 and 2015 combined steel dies) and adopting a 2.5cm thick wood template locally.
S4, constructing the spillway flat section anti-impact wear-resistant concrete;
the height of the spillway plain section is EL.674.00m, and the range of D/S0 + 062.924-D/S0 +078.920, no template is required to be installed, the bin number adopts a long arm back shovel and a K50 tower crane to cooperate to carry out through-bin pouring, after normal concrete C2 pouring is finished, construction of impact-resistant and wear-resistant concrete C3 is started, a phi 100 vibrating rod is used for vibrating, and a phi 50 flexible shaft vibrating rod is used for assisting vibration. In order to ensure the flatness of the recovered surface, the recovered surface sample frame rib is welded at the top elevation EL.674.00m of the flat section, the recovered surface sample frame rib adopts phi 22 round steel, the distance between the phi 22 round steel and the overflow surface structural steel is 1.5m, the recovered surface sample frame rib is used as a recovered surface track of the scraped surface steel, the recovered surface can be directly performed by sliding the scraped surface steel back and forth on the smeared surface sample frame rib or rolling the scraped surface sample frame rib on a phi 108 steel pipe, and then the recovered surface is matched with manual surface recovery and is performed simultaneously. And cutting off the sample frame ribs after finishing the surface collection, and collecting the surface of the concrete damaged by cutting off the sample frame ribs again.
S5, pouring concrete on the slope section of the overflow surface;
firstly, paving roller compacted concrete R2 of a dam body to a downstream side line of the roller compacted concrete, slotting the roller compacted concrete R2 within 50cm of the downstream side, and then adding cement and fly ash slurry, wherein the roller compacted concrete material is compacted by adopting a vibrating rod after adding the cement and the fly ash slurry instead of vibrating; then, transporting by using a dump truck or hoisting normal concrete C2 with low slump by using a K50 tower crane arranged on a dam into a bin, spreading by using a hydraulic backhoe or a flat bin machine, and pouring the normal concrete C2 in a small step mode with the thickness of 30cm like the roller compacted concrete R2; after the normal concrete C2 is poured to the upstream side line of the anti-impact wear-resistant concrete C3, using a dump truck or a K50 tower crane to hoist concrete to pour the anti-impact wear-resistant concrete C3 with the overflow surface being 50cm thick; after the anti-impact wear-resistant concrete C3 is put into a warehouse and leveled, vibrating rods with the diameter of phi 100mm and the diameter of phi 50mm are used, the vibrating rods with the diameter of phi 100mm are mainly vibrated, and a flexible shaft with the diameter of phi 50mm is used as auxiliary vibration, so that the vibration of normal concrete C2, anti-impact wear-resistant concrete C3 and modified concrete R2gev is completed; and finally, finishing the rolling of the combination part of the roller compacted concrete R2 and the metamorphic concrete R2gev and the normal concrete C2. According to the difference of the water content and the setting time of the roller compacted concrete and the normal concrete, the pouring of the normal concrete C2 and the overflow surface anti-impact wear-resistant concrete C3 on the downstream side of the dam lags behind the roller compacted concrete R2 and the metamorphosis concrete R2gev 1-1.5 layers of the dam body, and the layer height is 30-45 cm. The cross-sectional view of the flood plane is shown in figure 4.
S6, protecting and curing concrete;
the new concrete which just receives the surface is covered with the heat insulation material in time to be protected, so that the new concrete is not damaged by dryness, sunlight, rainwater and transportation or disturbed by the concrete caused by other modes.
Because the anti-impact wear-resistant concrete has higher grade, the anti-impact wear-resistant concrete is easy to dry and crack in the early stage, and the concrete is sprayed, sprinkled and maintained in time after the concrete is poured, so that the surface of the concrete is kept moist. And (4) adopting wet coarse linen for covering or adopting a perforated pipe constant flow water mode for uninterrupted maintenance, wherein the maintenance time is not less than 28 days.
S7, removing the template;
because the pouring of the anti-impact wear-resistant concrete C3 is latest and the final setting time is relatively short, after the pouring of the anti-impact wear-resistant concrete C3 is finished, after 8-12 h in summer and 24-30 h in winter, the dismantling of the cantilever formwork or the combined steel mould of the overflow surface can be started, the pouring lift of the next bin of concrete is prepared, and the concrete of the overflow surface is protected from being damaged in the mould dismantling process.
A dam is an arched roller compacted concrete gravity dam, the maximum dam height is 133m, the dam crest elevation is EL.763.00m, the dam crest length is 231m, and a left bank non-overflow dam section 47m long, an overflow dam section 86m long and a right bank non-overflow dam section 98m long are sequentially arranged from left to right. Five guide walls and four overflow surfaces are arranged on an overflow dam section, the elevation of the horizontal section of the overflow surface is EL.674.00m, the elevation of the top of an overflow weir is EL.750.40m, the elevation of the second-stage normal water storage level is 76.4m, the vertical height from the horizontal section of the overflow surface to the top of the overflow weir is 20m of radius from EL.674.00m-EL.683.71m, and the elevation from EL.683.71m to the top of the overflow weir is 1: a ramp segment of 0.6; the width of each spillway is gradually changed from 8m at the bottom to 17.5m at the top elevation of the spillway; a drainage mesopore with the size of 3.6m multiplied by 2.7m is respectively arranged at R1 and L1 overflow surface elevations EL.743.20m, which are the primary normal water storage level elevations, and no gate control is needed. The overflow surface water passing part adopts 50cm thick shock-resistant and wear-resistant concrete C3 doped with silicon powder.
The dam concrete is classified as shown in the table below, and a typical cross-section of the dam overflow section is shown in fig. 2.
In order to give full play to the advantages of high mechanization degree, high dam-entering strength, shortened construction period, reduced cost, strong adaptability and the like of the roller compacted concrete dam construction technology, and not to influence the construction progress of the normal anti-impact wear-resistant concrete of the overflow surface of the dam, the invention adopts the method for synchronously pouring and constructing the normal concrete and the roller compacted concrete of the overflow surface of the dam by optimizing the concrete mix proportion and the field construction organization, and obtains a good application foundation in the dam construction engineering practice.
The dam construction of the embodiment is controlled by optimizing the mixing proportion of concrete, and the initial setting time and the final setting time of roller compacted concrete and normal concrete; performing organization site construction, wherein the organization site construction comprises a pouring sequence of roller compacted concrete and normal concrete; the construction method is implemented by synchronously pouring normal anti-impact wear-resistant concrete C3 and RCC dam roller compacted concrete R2 on the overflow surface, and because the normal concrete and the dam body roller compacted concrete of the part rise synchronously, compared with the scheme of pouring the anti-impact wear-resistant concrete in the second stage, a large amount of labor, time, materials, equipment resources, water and electricity resources and the like are saved, the construction period of the project is shortened on the premise that the concrete pouring quality is ensured, and the construction cost is greatly reduced, and the construction method specifically comprises the following steps: 1) the pouring quality of the concrete is ensured: because the anti-impact wear-resistant concrete C3 and the normal concrete C2 are synchronously poured, the two concretes can be better combined, and the quality hidden danger in the aspect of concrete joint surface combination during secondary pouring of the anti-impact wear-resistant concrete C3 is reduced; 2) the construction period is shortened: the time for secondary installation and removal of the template, secondary concrete scouring treatment, bin number washing and acceptance inspection is reduced, and the construction period is shortened; 3) the construction cost is reduced: the labor and materials required for secondary installation of the template, such as steel templates, frame tubes, wood templates, die-drawing ribs, welding electrodes, screws, screw caps, lead wires and the like, and the consumption of labor, hair-washing machine equipment and hydroelectric resources required for rough surface treatment in secondary concrete pouring are reduced.
Claims (5)
1. A dam overflow surface normal state and roller compacted concrete pouring construction method is used for dam or overflow dam section engineering construction with main concrete being roller compacted concrete and overflow surface being anti-impact wear-resistant concrete, and is characterized in that: dividing dam or overflow dam section into impervious concrete (R1), roller compacted concrete (R2), metamorphosis concrete (R2gev), normal concrete (C2) and impact-resistant and wear-resistant concrete (C3) according to the cross section from top to bottom; the pouring process comprises the following steps: firstly, binding, installing and welding overflow surface structural steel bars and concrete collection surface sample frame steel bars; binding a precast block with strength grade not lower than that of impact-resistant and wear-resistant concrete on the overflow surface structural steel bar, and then starting to install a template; pouring construction of dam roller compacted concrete and overflow surface anti-impact wear-resistant concrete is carried out after the flushed bin number;
the procedure is as follows: paving the roller compacted concrete of the dam body to a downstream sideline; pouring metamorphic concrete within the range of 50cm at the downstream side of the roller compacted concrete; normal concrete on the downstream side of the metamorphic concrete is put into a warehouse; putting the anti-impact wear-resistant concrete into a warehouse; vibrating normal concrete and impact-resistant and wear-resistant concrete; rolling the combination part of the roller compacted concrete and the abnormal concrete and the normal concrete;
pouring and lifting construction are carried out on overflow surface impact-resistant and wear-resistant concrete and dam roller compacted concrete synchronously; the pouring of normal concrete and impact-resistant and abrasion-resistant concrete on the downstream side of the dam is delayed by 1-1.5 layers of roller compacted concrete and metamorphic concrete of the dam body, and the layer thickness is 30-45 cm.
2. The dam overflow surface normal state and roller compacted concrete pouring construction method according to claim 1, characterized in that: the impervious concrete (R1) adopts a secondary composition, and the strength is 20 Mpa; the roller compacted concrete (R2) adopts three-grade composition, and the strength is 16 Mpa; the metamorphic concrete (R2gev) adopts three grades, and the strength is 16 Mpa; the normal concrete (C2) adopts secondary composition, and the strength is 16 Mpa; the impact-resistant wear-resistant concrete (C3) adopts a secondary composition, has the strength of 35Mpa and the thickness of not less than 50 cm.
3. The dam overflow surface normal state and roller compacted concrete pouring construction method according to claim 2 is characterized by comprising the following specific steps:
s1, mounting and welding overflow surface structural steel bars;
installing and welding spillway steel bars and concrete collecting sample frame steel bars in a layered and segmented manner according to a dam spillway steel bar graph;
s2, mounting the precast block;
installing a template from the horizontal section elevation slope-raising circular arc section of the spillway to pour; in order to support the template, placing a concrete precast block between the structural steel bar and the template, wherein the size of the concrete precast block is 10cm multiplied by 10cm, and the concrete precast block is connected with the structural steel bar by a binding wire, and the strength grade of the precast block is not lower than that of the impact-resistant and wear-resistant concrete; arranging the prefabricated blocks at joints of the template blocks;
s3, installing a template;
the horizontal section of the overflow surface does not need a template; the overflow surface arc section is constructed by adopting a combined steel mould, the local part is supplemented by adopting a wood template, flexible anchor bars and conical nuts required by the cantilever template can be pre-embedded, and the star pursuing nut is accurately positioned and controlled on a horizontal line; the slope section of the overflow surface adopts a cantilever template, and the local part adopts a combined steel mould and a wood template for supplement; the overflow surface transition section is completely supplemented by adopting a combined steel mould and partially supplemented by adopting a wood template;
s4, constructing the anti-impact wear-resistant concrete of the spillway flat section;
in the spillway flat section, after normal concrete pouring is finished, construction of anti-impact wear-resistant concrete is started, vibration is carried out by using a vibrating rod, and vibration is assisted by using a flexible shaft vibrating rod;
s5, pouring concrete on the slope section of the overflow surface;
paving roller compacted concrete of a dam body to a downstream side line of the roller compacted concrete, cutting out distorted concrete within 50cm of the downstream side, adding cement and fly ash slurry, and compacting the partial roller compacted concrete by adopting a vibrating rod after adding the cement and the fly ash slurry; then normal concrete is put into a bin, a hydraulic backhoe or a leveling machine is used for paving, and the normal concrete and the roller compacted concrete are poured layer by adopting small steps with the thickness of 30-45 cm; after normal concrete is poured to the upstream side line of the impact-resistant and wear-resistant concrete, the impact-resistant and wear-resistant concrete with the overflow surface thickness not less than 50cm is put into a bin, a vibrating rod is used for vibrating after the bin is opened, the vibrating rod is used for assisting in vibrating, and the vibrating of the normal concrete, the impact-resistant and wear-resistant concrete and the metamorphic concrete is completed; finally, finishing the rolling of the combination part of the roller compacted concrete and the abnormal concrete and the normal concrete;
s6, protecting and curing concrete;
covering a heat-insulating material on the new concrete which is just received for protection;
s7, removing the template;
after the pouring of the anti-impact wear-resistant concrete is finished, after 8-12 hours in summer and 24-30 hours in winter, the cantilever formwork or the combined steel mould of the overflow surface starts to be dismantled, and the next concrete pouring lift is prepared.
4. The dam overflow surface normal state and roller compacted concrete pouring construction method according to claim 3, characterized in that: s4 construction of the anti-impact and anti-abrasion concrete of the spillway plain section, in order to ensure the flatness of the folded surface, welding folded surface sample frame ribs on the top of the plain section at an elevation, wherein the folded surface sample frame ribs are made of round steel, are arranged on the overflow surface structural steel bars at intervals of 1.5m and are used as folded surface rails of scraped surface steel bars, the folded surface can be directly formed by sliding the scraped surface steel bars back and forth on the smeared surface sample frame ribs or rolling the scraped surface steel bars on the sample frame ribs by phi 108 steel pipes, and then the manual folded surface is matched for simultaneous operation; and after finishing the surface collection, cutting off the surface collection sample frame ribs in time and collecting the surface of the concrete damaged by cutting off the sample frame ribs again.
5. The dam overflow surface normal and roller compacted concrete pouring construction method according to claim 3, characterized in that: in the step S6, during the protection and maintenance of the concrete, after the concrete is poured, spraying water and maintaining in time to keep the concrete surface moist; and (4) adopting wet coarse linen for covering or adopting a perforated pipe constant flow water mode for uninterrupted maintenance, wherein the maintenance time is not less than 28 days.
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Application publication date: 20220902 |