CN117344735A - Construction method of self-compacting rock-fill concrete - Google Patents
Construction method of self-compacting rock-fill concrete Download PDFInfo
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- CN117344735A CN117344735A CN202311426141.5A CN202311426141A CN117344735A CN 117344735 A CN117344735 A CN 117344735A CN 202311426141 A CN202311426141 A CN 202311426141A CN 117344735 A CN117344735 A CN 117344735A
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- rock
- fill
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 238000010276 construction Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000011376 self-consolidating concrete Substances 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000008262 pumice Substances 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 239000008030 superplasticizer Substances 0.000 claims 1
- 238000004381 surface treatment Methods 0.000 claims 1
- 238000005056 compaction Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000036571 hydration Effects 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/40—Foundations for dams across valleys or for dam constructions
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The application discloses a self-compacting rock-fill concrete construction method, and relates to the technical field of mass concrete. The self-compaction rock-fill concrete construction method comprises the following steps: treating a basic surface; mao Kuaidan is sent into a rock-fill body with gaps formed on the basic surface in the bin; and (5) delivering the self-compacting concrete into a bin and pouring the self-compacting concrete on the rock-fill body. The construction is completed only by two working procedures of rock-fill warehousing and self-compacting concrete pouring, and the construction process is simple; the application also uses Mao Kuaidan in a large amount, the use proportion of the application can reach 55% -60%, so that the use amount of concrete is greatly reduced, the hydration heat in the concrete solidification process is reduced, the temperature control measures can be simplified or even cancelled according to the actual temperature condition of the site, in addition, the vibration procedure is omitted in the pouring process, the production efficiency is further improved, the construction period is shortened, and the investment of labor cost is reduced.
Description
Technical Field
The application relates to the technical field of mass concrete, in particular to a self-compacting rock-fill concrete construction method.
Background
Bulk concrete is generally referred to as: a substantial amount of concrete having a concrete structure body minimum geometry of not less than 1m, or concrete expected to cause generation of harmful cracks due to temperature change and shrinkage caused by hydration of a gel material in the concrete.
Currently, large volumes of concrete are generally most common in hydraulic buildings, like concrete gravity dams and the like. The surface coefficient of the mass concrete is smaller, the heat release of cement hydration is more concentrated, the internal temperature rise is faster, and when the temperature difference between the inside and the outside of the concrete is larger, the concrete can generate temperature cracks, and the structural safety and normal use are affected. Therefore, a stricter temperature control measure is required to be set in the construction process of the mass concrete, so that the temperature difference between the inside and the outside of the concrete is reduced, the construction quality is ensured, the construction process is complex, and the construction period is long.
Disclosure of Invention
The purpose of the application is to provide a self-compacting rock-fill concrete construction method, which solves the problems of complex construction process and long construction period of the existing mass concrete.
The technical scheme adopted for solving the technical problems is as follows: a self-compacting rock-fill concrete construction method comprises the following steps: treating a basic surface; mao Kuaidan is sent into a rock-fill body with gaps formed on the basic surface in the bin; and (5) delivering the self-compacting concrete into a bin and pouring the self-compacting concrete on the rock-fill body.
Further, the basic surface processing includes: removing accumulated water in the bin, picking loose rocks on bedrock, removing pumice virtual slag, roughening the foundation surface, and blowing the foundation surface by adopting high-pressure air.
Further, the rock-fill body with a gap formed on the foundation surface for feeding Mao Kuaidan into the bin comprises: screening stones, loading Mao Kuaidan with the grain diameter of more than or equal to 30cm after screening, transporting the stones into a bin, and stacking Mao Kuaidan on a foundation surface to form a rock-fill body with gaps.
Further, before entering a warehouse, the transport vehicle filled with rubble sequentially runs on a steel grating road and a rubble road; when the transport vehicle runs on the steel grating, the transport vehicle is flushed by the flushing pipeline.
Further, the exposed surface of the rock-fill body contains less than or equal to 10 pieces of rubble with a particle size of less than 200mm per square meter.
Further, the rubble stones in the rock-fill body are arranged according to the upper size, the middle size and the outer size.
Further, the self-compacting concrete is sent into the bin to be poured on the rock-fill body, and the method comprises the following steps: self-compacting concrete is produced, the self-compacting concrete is pumped to a dam, the self-compacting concrete is poured into a warehouse according to a unidirectional sequence, and the distance between two adjacent pouring points is controlled to be smaller than 3m in the pouring process.
Further, during casting, the maximum free fall height of the self-compacting concrete is less than or equal to 5m.
Further, the self-compacting concrete is produced by: respectively putting the weighed aggregate and the cementing material into a stirrer to be dry-mixed for at least 30s, and then adding water and an additive to be stirred for at least 60s; wherein the cementing material comprises cement and fly ash, and when the weight of the cementing material is m, the weight of the cement is m/3-2 m/3.
Further, the additive comprises a high-efficiency water reducing agent and an anti-segregation agent.
The beneficial effects of this application:
according to the self-compacting rock-fill concrete construction method, the rock-fill body is formed by stacking Mao Kuaidan in the bin, the self-compacting concrete is poured on the rock-fill body, and the self-compacting concrete is filled in the gaps of the rock-fill body under the action of gravity by utilizing the characteristics of high fluidity and high penetrability of the self-compacting concrete, so that the large-volume concrete with strength meeting the requirements is formed. Compared with the prior art, the construction is completed only by adopting two working procedures of rock-fill warehousing and self-compaction concrete pouring, the construction process is simple, the two working procedures can be completed through large-scale mechanized construction, the manual participation is reduced, the rock-fill warehousing and self-compaction concrete pouring can be performed in parallel after a certain rock-fill warehouse surface is completed, the interference between the two working procedures is small, and the production efficiency is doubled; according to the concrete pouring device, mao Kuaidan is used in a large amount, the use proportion of the concrete pouring device can reach 55% -60%, so that the use amount of concrete is greatly reduced, the hydration heat in the concrete solidification process is reduced, temperature control measures can be simplified or even cancelled according to the actual temperature condition of the site, the vibration procedure is omitted in the pouring process, the production efficiency is further improved, the construction period is shortened, and the investment of labor cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a self-compacting rockfill concrete construction method provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. And the embodiments and features of the embodiments in this application may be combined with each other without conflict.
In the description of the embodiments of the present application, the indicated azimuth or positional relationship is based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship conventionally put when the product of the application is used, or the azimuth or positional relationship conventionally understood by those skilled in the art. The terms "disposed," "configured," "mounted," "connected," "coupled" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, and integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
Referring to fig. 1, a self-compacting rock-fill concrete construction method provided in an embodiment of the present application includes:
s1, basic surface processing.
Basic surface processing, comprising: removing accumulated water in the bin, picking loose rocks on bedrock, removing pumice virtual slag, roughening the foundation surface, and blowing the foundation surface by adopting high-pressure air. Wherein, the accumulated water in the bin can be removed by scooping up with a tool or by sucking up with cotton yarn, rag and the like.
S2, conveying Mao Kuaidan into a rock-fill body with gaps formed on a basic surface in the bin.
A rock-fill body having voids formed in a base surface for feeding Mao Kuaidan into a silo, comprising: screening stones, loading Mao Kuaidan with the grain diameter of more than or equal to 30cm after screening, transporting the stones into a bin, and stacking Mao Kuaidan on a foundation surface to form a rock-fill body with gaps. Wherein, the rubble stones in the rock-fill body are arranged according to the upper size, the middle size and the outer size.
The stone can be the stone produced by blasting, or can be replaced by construction waste, solid waste of old dams, pebbles in river channels and the like, and the stone blocks with larger particle sizes are selected when the stone is collected. For large stones, the loading can be selected by a digging machine directly. For the mixture with more minor diameters, in order to ensure that the requirement of the rock-fill particle size is met, a steel screen is adopted for screening, the screened Mao Kuaidan with the particle size larger than or equal to 30cm is loaded by a digging machine, and the screened minor diameter materials can be transported and stacked by a loading machine for processing aggregates.
Before entering a warehouse, the transport vehicle filled with rubble sequentially runs on a steel grating road and a broken stone road; when the transport vehicle runs on the steel grating, the transport vehicle is flushed by the flushing pipeline. Wherein the steel grating is formed by steel gratings laid on the in-house road, for example, the length of the steel grating may be 9m. The crushed stone road is formed of crushed stone laid on a warehouse entry road, for example, the length of the crushed stone road is 3-5 m. When the transport vehicle runs on the steel grating, the flushing pipeline is utilized to flush the transport vehicle, so that the sludge on the transport vehicle can be flushed out, and is enabled to fall into a gap of the steel grating, the sludge is prevented from being brought into a bin along with the transport vehicle, then the transport vehicle runs on a broken stone road, tires of the transport vehicle can be dehydrated, and water logging is prevented from being brought into the bin along with the transport vehicle.
For large face rockfill, an annular road should be arranged to separate vehicles into the face and out of the face. Mao Kuaidan is put into a bin, a reversing method is adopted, the bin is distributed from inside to outside, and a loader and an excavator are arranged for leveling the bin. For large stones with a particle size exceeding 800mm, it is preferable to place them in the middle of the bin face. In the area close to the thin parts of the template, the water stop belt and the like, about 1m, artificial auxiliary rock-fill is needed to avoid the impact of mechanical rock-fill on the template and the water stop belt. The stone stacking body is not contacted with the template at the position with the requirement of the appearance surface. The upstream seepage prevention area adopts grab bucket to grab the rock pile. The exposed surface of the rock-fill body contains less than or equal to 10 pieces of rubble stones with a particle size of less than 200mm per square meter, and the rock-fill body should not be stacked intensively.
S3, delivering the self-compacting concrete into a bin and pouring the self-compacting concrete on the rock-fill body.
Delivering self-compacting concrete into a silo to be poured on a rock-fill body, comprising: self-compacting concrete is produced, the self-compacting concrete is pumped to a dam, the self-compacting concrete is poured into a warehouse according to a unidirectional sequence, the distance between two adjacent pouring points is controlled to be smaller than 3m in the pouring process, and the maximum free falling height of the self-compacting concrete is smaller than or equal to 5m.
Producing self-compacting concrete comprising: respectively putting the weighed aggregate and the cementing material into a stirrer to be dry-mixed for at least 30s, and then adding water and an additive to be stirred for at least 60s; wherein the mixer is a double horizontal shaft forced mixer, the additive comprises a high-efficiency water reducing agent and an anti-segregation agent, the cementing material comprises cement and fly ash, and when the weight of the cementing material is m, the weight of the cement is m/3-2 m/3. For example, when the weight of the gel material is 30kg, the amount of cement may be adjusted in the range of 10 to 20kg, and the amount of fly ash may be adjusted in the range of 20 to 10 kg. The method can directly produce the rock-fill concrete by using solid wastes such as tailings as aggregate and inert powder materials, greatly saves energy sources in construction links such as aggregate crushing, concrete production pouring and the like while reducing the consumption of cementing materials to the maximum extent, reduces the emission of carbon dioxide, changes waste into valuables, realizes cyclic utilization, and promotes energy conservation and emission reduction.
In the pouring process, the self-compacting concrete can be pumped into a bin, the type of the concrete pump, the conveying pipe diameter, the piping distance and the like are reasonably determined according to the test result and the construction condition, and the pouring speed of the concrete is determined according to the test result and the construction condition. The pumping and pouring of the concrete should keep the continuity, and when the concrete can not reach the required working performance due to the overlong pump stopping time, the concrete in the pump and the pump pipe should be removed in time and re-proportioned.
In the casting process, the principle of unidirectional point-by-point casting should be followed, each casting point can be moved to the next casting point for casting after being filled, the casting points should not be reused, the casting of concrete should be moved from the upstream face to the downstream face, and meanwhile, the movement and deformation of templates, embedded parts and the like should be closely concerned and prevented. When the self-compacting concrete is poured in a layered and continuous manner, the next layer of concrete should be poured before the next concrete is initially set. When the warehouse is collected, besides reaching the design top surface of the structure, the self-compaction performance concrete pouring is suitable for enabling a proper amount of stone blocks to be 50-150 mm higher than the pouring surface, and meanwhile, the self-compaction performance concrete pouring top surface can be not manually leveled so as to strengthen layer combination. After the self-compaction performance concrete pouring is finished, small stones can be properly thrown to the part with the unsaturated piled stones before the initial setting of the concrete, and the cracking resistance of the concrete surface can be effectively improved.
According to the self-compacting rock-fill concrete construction method, the rock-fill body is formed by stacking Mao Kuaidan in the bin, the self-compacting concrete is poured on the rock-fill body, and the self-compacting concrete is filled in the gaps of the rock-fill body under the action of gravity by utilizing the characteristics of high fluidity and high penetrability of the self-compacting concrete, so that the large-volume concrete with strength meeting the requirements is formed. Compared with the prior art, the construction is completed only by adopting two working procedures of rock-fill warehousing and self-compaction concrete pouring, the construction process is simple, the two working procedures can be completed through large-scale mechanized construction, the manual participation is reduced, the rock-fill warehousing and self-compaction concrete pouring can be performed in parallel after a certain rock-fill warehouse surface is completed, the interference between the two working procedures is small, and the production efficiency is doubled; according to the concrete pouring device, mao Kuaidan is used in a large amount, the use proportion of the concrete pouring device can reach 55% -60%, so that the use amount of concrete is greatly reduced, the hydration heat in the concrete solidification process is reduced, temperature control measures can be simplified or even cancelled according to the actual temperature condition of the site, the vibration procedure is omitted in the pouring process, the production efficiency is further improved, the construction period is shortened, and the investment of labor cost is reduced.
The foregoing description is only of the preferred embodiment of the present application and is not intended to limit the scope of the present application in any way, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. The construction method of the self-compacting rock-fill concrete is characterized by comprising the following steps of: treating a basic surface; mao Kuaidan is sent into a rock-fill body with gaps formed on the basic surface in the bin; and (5) delivering the self-compacting concrete into a bin and pouring the self-compacting concrete on the rock-fill body.
2. The method for constructing self-compacting rockfill concrete according to claim 1, wherein the foundation surface treatment comprises: removing accumulated water in the bin, picking loose rocks on bedrock, removing pumice virtual slag, roughening the foundation surface, and blowing the foundation surface by adopting high-pressure air.
3. The method of claim 1, wherein the step of feeding Mao Kuaidan into the silo comprises the steps of: screening stones, loading Mao Kuaidan with the grain diameter of more than or equal to 30cm after screening, transporting the stones into a bin, and stacking Mao Kuaidan on a foundation surface to form a rock-fill body with gaps.
4. A self-compacting rockfill concrete construction method according to claim 3, wherein the transport vehicle filled with rubble runs on the steel grid and the gravel road in sequence before entering the silo; when the transport vehicle runs on the steel grating, the transport vehicle is flushed by the flushing pipeline.
5. The method of constructing a self-compacting rockfill concrete according to claim 1, wherein the exposed face of the rockfill body contains 10 or less pieces of rubble having a particle size of less than 200mm per square meter.
6. The method of claim 1, wherein the rubble stones in the rock-fill body are arranged in a lower-upper-size, middle-upper-size, and outer-size.
7. The method for constructing self-compacting rockfill concrete according to claim 1, wherein the step of delivering the self-compacting concrete into the silo to be poured on the rockfill body comprises the steps of: self-compacting concrete is produced, the self-compacting concrete is pumped to a dam, the self-compacting concrete is poured into a warehouse according to a unidirectional sequence, and the distance between two adjacent pouring points is controlled to be smaller than 3m in the pouring process.
8. The method of claim 7, wherein the maximum free fall height of the self-compacting concrete is less than or equal to 5m during casting.
9. The method of constructing self-compacting rockfill concrete according to claim 7, wherein said producing self-compacting concrete comprises: respectively putting the weighed aggregate and the cementing material into a stirrer to be dry-mixed for at least 30s, and then adding water and an additive to be stirred for at least 60s; wherein the cementing material comprises cement and fly ash, and when the weight of the cementing material is m, the weight of the cement is m/3-2 m/3.
10. The method of self-compacting rockfill concrete construction according to claim 9, wherein the admixture includes a superplasticizer and an anti-segregation agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311426141.5A CN117344735A (en) | 2023-10-31 | 2023-10-31 | Construction method of self-compacting rock-fill concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311426141.5A CN117344735A (en) | 2023-10-31 | 2023-10-31 | Construction method of self-compacting rock-fill concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117344735A true CN117344735A (en) | 2024-01-05 |
Family
ID=89362946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311426141.5A Pending CN117344735A (en) | 2023-10-31 | 2023-10-31 | Construction method of self-compacting rock-fill concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117344735A (en) |
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2023
- 2023-10-31 CN CN202311426141.5A patent/CN117344735A/en active Pending
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