CN112010604A - Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete - Google Patents
Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete Download PDFInfo
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- CN112010604A CN112010604A CN202010850696.2A CN202010850696A CN112010604A CN 112010604 A CN112010604 A CN 112010604A CN 202010850696 A CN202010850696 A CN 202010850696A CN 112010604 A CN112010604 A CN 112010604A
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- parts
- counterweight
- box girder
- steel box
- stayed bridge
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses pumping concrete for a steel box girder counterweight of a swivel cable-stayed bridge, which is prepared from the following components in parts by weight: 310-350 parts of a cementing material, 1840-1960 parts of iron ore, 1250-1450 parts of iron sand, 5.58-5.85 parts of a water reducing agent and 152-161 parts of water; wherein the iron ore is in 5-31.5 mm gradation, and the fineness of the iron sand is 2.3-3.0. The volume weight of the pump concrete for the steel box girder counterweight of the swivel cable-stayed bridge prepared by the invention can reach 3500kg/m3～4000kg/m3The slump is concentrated in the range of 180 +/-20 mm, and the invention can adjust the use proportion according to the apparent density of aggregate to meet the counterweight requirement of the design of the steel box girder of the swivel cable-stayed bridge; the pumping concrete for the steel box girder counterweight of the swivel cable-stayed bridge has good working performance, meets the pumping pressure requirements of common automobile pumps and ground pumps, can be prepared, transported and constructed according to the common concrete requirements, and is convenient to operate.
Description
Technical Field
The invention belongs to the technical field of concrete, and relates to pumping concrete for a steel box girder counterweight of a swivel cable-stayed bridge and application thereof.
Background
At present, many traffic routes relate to cross-railway and cross-highway construction, and in order to avoid influence on cross-line traffic passage caused by construction, a bridge flat turning construction method is often adopted. The swivel steel box girder cable-stayed bridge has the advantages of safety, reliability, excellent integrity, good economy and the like, and is widely applied. In order to ensure the structural balance in the rotating process and the using process of the steel box girder cable-stayed bridge, the vertical load of a tower center is increased, and the overturning is prevented, the bridge deck is generally provided with a balancing weight or permanent balancing weight concrete is poured in a steel box girder structural bin.
The volume weight of the common concrete is generally 2400kg/m3Compared with common concrete, the volume weight of the counterweight concrete is larger and can even reach 2 times of that of the common concrete. The heavy concrete is usually prepared by mixing iron ore, barite, iron sand and the like as aggregates, but the mixture is difficult to produce and construct due to the fact that the coarse aggregates have higher specific gravity than common crushed stones, and phenomena of sedimentation, layering, segregation, bleeding and the like of the coarse aggregates are easy to generate.
Disclosure of Invention
The invention provides pumping concrete for a steel box girder counterweight of a swivel cable-stayed bridge and application thereof, which aim to solve the problem that coarse aggregate is separated from slurry in the pumping process of high-volume-weight counterweight concrete.
The technical scheme adopted by the invention is as follows:
the invention provides pumping concrete for a steel box girder counterweight of a swivel cable-stayed bridge, which is prepared from the following components in parts by weight: 310-350 parts of a cementing material, 1840-1960 parts of iron ore, 1250-1450 parts of iron sand, 5.58-5.85 parts of a water reducing agent and 152-161 parts of water; wherein the iron ore is in 5-31.5 mm gradation, and the fineness of the iron sand is 2.3-3.0.
In a further preferred embodiment of the above technical solution, the apparent density of the iron ore is 4400 to 4600kg/m3(ii) a The apparent density of the iron sand is 6000-6200 kg/m3。
As a further preferred mode of the above-mentioned means, the apparent density of the iron ore is 4490kg/m3(ii) a The apparent density of the iron sand is 6120kg/m3。
According to the technical scheme, the cementing material is composed of cement and fly ash, wherein the cement accounts for 250-261 parts by weight, and the fly ash accounts for 60-65 parts by weight.
In a further preferred embodiment of the present invention, the water-to-gel ratio is 0.49.
Preferably, the cement is 42.5-grade portland cement, and the fly ash is II-grade fly ash.
As a further optimization of the technical scheme, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
In a further preferred embodiment of the above-described aspect, tap water is used as the blending water.
As a further optimization of the technical scheme, the pump concrete for the matched weight of the steel box girder of the swivel cable-stayed bridge is prepared from the following components in parts by weight: 261 parts of cement, 65 parts of fly ash, 1960 parts of iron ore, 1447 parts of iron sand, 161 parts of water and 5.85 parts of water reducing agent.
The invention also provides application of the pump concrete for the steel box girder counterweight of the swivel cable-stayed bridge in counterweight of the steel box girder of the swivel cable-stayed bridge, and preparation, transportation and construction methods of the pump concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge can be carried out according to the requirements of common concrete.
The technical scheme provided by the invention has the beneficial effects that:
(1) the volume weight of the pump concrete for the steel box girder counterweight of the swivel cable-stayed bridge prepared by the invention is 3500kg/m3～4000kg/m3The slump is concentrated in the range of 180 +/-20 mm, the phenomenon of layered segregation is avoided in the preparation, transportation and pumping processes, and the compressive strength meets the design requirement.
(2) The pumping concrete for the steel box girder counterweight of the swivel cable-stayed bridge prepared by the invention can meet the pumping pressure requirements of common automobile pumps and ground pumps, and the preparation, transportation and construction methods can be carried out according to the requirements of common concrete, so that the operation is convenient.
(3) Iron ore resources are rich in China, iron ore and iron sand are easy to prepare, and the pump concrete for the steel box girder balance weight of the swivel cable-stayed bridge prepared by the invention is low in cost.
Detailed Description
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 data in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Raw materials: the iron ore used in this embodiment is produced from Anhui mussel port, and has 5-31.5 mm gradation and an apparent density of 4490kg/m3(ii) a The iron sand is produced from Anhui clam, the fineness modulus is concentrated at 2.3-3.0, and the apparent density is 6120kg/m3(ii) a The cement is 42.5-grade portland cement; the fly ash is II-grade fly ash; the water is tap water; the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
The pump concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge provided by the embodiment is prepared from the following components in parts by weight: 250kg of cement, 60kg of fly ash, 1500kg of iron ore, 1030kg of iron sand, 152kg of water and 5.58kg of water reducing agent.
The concrete of this example has a design volume weight of 3000kg/m3The measured bulk density is 2980kg/m3The slump constant is 180 +/-20 m, the layered segregation phenomenon does not occur in the preparation, transportation and pumping processes, the workability is good, the pumping is realized, the 7d strength is 35.2MPa, and the 28d strength is 41.3 MPa.
Example 2
Raw materials: the iron ore used in this embodiment is produced from Anhui mussel port, and has 5-31.5 mm gradation and an apparent density of 4490kg/m3(ii) a The iron sand is produced from Anhui clam, the fineness modulus is concentrated at 2.3-3.0, and the apparent density is 6120kg/m3(ii) a The cement is 42.5-grade portland cement; the fly ash is II-grade fly ash; the water is tap water; the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
The pump concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge provided by the embodiment is prepared from the following components in parts by weight: 258kg of cement, 64kg of fly ash, 1840kg of iron ore, 1278kg of iron sand, 157kg of water and 5.75kg of water reducing agent.
The concrete of the embodiment has the design volume weight of 3600kg/m3The actual volume weight is 3660kg/m3The slump constant is 180 +/-20 mm, the layered segregation phenomenon does not occur in the preparation, transportation and pumping processes, the workability is good, the pumping is realized, the 7d strength is 37.8MPa, and the 28d strength is 44.7 MPa.
Example 3
Raw materials: the iron ore used in this embodiment is produced from Anhui mussel port, and has 5-31.5 mm gradation and an apparent density of 4490kg/m3(ii) a The iron sand is produced from Anhui clam, the fineness modulus is concentrated at 2.3-3.0, and the apparent density is 6120kg/m3(ii) a The cement is 42.5-grade portland cement; the fly ash is II-grade fly ash; the water is tap water; the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
The pump concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge provided by the embodiment is prepared from the following components in parts by weight: 261kg of cement, 65kg of fly ash, 1960kg of iron ore, 1447kg of iron sand, 161kg of water and 5.85kg of water reducing agent.
The concrete design volume weight of the embodiment is 3900kg/m3The measured volume weight is 4030kg/m3The slump constant is 180 +/-20 mm, the layered segregation phenomenon does not occur in the preparation, transportation and pumping processes, the workability is good, the pumping is realized, the 7d strength is 39.5MPa, and the 28d strength is 47.6 MPa.
In the above examples, example 1 did not satisfy the design volume weight index, and examples 2 and 3 satisfied the requirements in terms of volume weight, slump, workability, and strength.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. It is not necessary or necessary to exhaustively enumerate all embodiments herein, and obvious variations or modifications can be introduced thereby while remaining within the scope of the invention as claimed.
Claims (10)
1. The pump concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge is characterized by being prepared from the following components in parts by weight: 310-350 parts of a cementing material, 1840-1960 parts of iron ore, 1250-1450 parts of iron sand, 5.58-5.85 parts of a water reducing agent and 152-161 parts of water; wherein the iron ore is graded by 5-31.5 mm, and the fineness of the iron sand is 2.3-3.0.
2. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the apparent density of the iron ore is 4400-4600 kg/m3(ii) a The apparent density of the iron sand is 6000-6200 kg/m3。
3. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 2, which is characterized in that: the apparent density of the iron ore is 4490kg/m3(ii) a The apparent density of the iron sand is 6120kg/m3。
4. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the cementing material is composed of cement and fly ash, wherein the cement accounts for 250-261 parts by weight, and the fly ash accounts for 60-65 parts by weight.
5. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the water-to-glue ratio was 0.49.
6. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the cement is 42.5-grade portland cement, and the fly ash is II-grade fly ash.
7. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than or equal to 25%.
8. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1, which is characterized in that: the mixing water is tap water.
9. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to claim 1 or 2, which is characterized in that: the pump concrete for the rotor cable-stayed bridge steel box girder is prepared from the following components in parts by weight: 261 parts of cement, 65 parts of fly ash, 1960 parts of iron ore, 1447 parts of iron sand, 161 parts of water and 5.85 parts of water reducing agent.
10. The pumped concrete for the counterweight of the steel box girder of the swivel cable-stayed bridge according to any one of claims 1 to 9, which is used for the counterweight of the steel box girder of the swivel cable-stayed bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010850696.2A CN112010604A (en) | 2020-08-21 | 2020-08-21 | Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010850696.2A CN112010604A (en) | 2020-08-21 | 2020-08-21 | Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete |
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| Publication Number | Publication Date |
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| CN112010604A true CN112010604A (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010850696.2A Pending CN112010604A (en) | 2020-08-21 | 2020-08-21 | Pumping concrete for counterweight of steel box girder of swivel cable-stayed bridge and application of pumping concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897951A (en) * | 2021-02-04 | 2021-06-04 | 成都精准混凝土有限公司 | Concrete with volume weight of more than 5000kg per cubic meter and preparation method thereof |
| CN113149572A (en) * | 2021-05-28 | 2021-07-23 | 三一重机有限公司 | Counterweight concrete and preparation method thereof |
Citations (2)
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|---|---|---|---|---|
| JPH01317147A (en) * | 1988-02-12 | 1989-12-21 | Toomen Constr Kk | Composition for heavyweight concrete production and production of heavyweight concrete therefrom |
| CN101676239A (en) * | 2008-09-19 | 2010-03-24 | 湖南省第六工程有限公司 | Premixed and pumped heavy concrete |
-
2020
- 2020-08-21 CN CN202010850696.2A patent/CN112010604A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01317147A (en) * | 1988-02-12 | 1989-12-21 | Toomen Constr Kk | Composition for heavyweight concrete production and production of heavyweight concrete therefrom |
| CN101676239A (en) * | 2008-09-19 | 2010-03-24 | 湖南省第六工程有限公司 | Premixed and pumped heavy concrete |
Non-Patent Citations (6)
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| 刘永松等: "钢箱梁斜拉桥压重混凝土施工技术", 《施工技术》 * |
| 宋裕增等: "铁尾矿砂混凝土的和易性与强度特点", 《工程质量》 * |
| 李锋等: "重混凝土在大桥桥梁板配重中的应用研究", 《浙江建筑》 * |
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| 邓长军等: "重混凝土配合比设计及其在城市桥梁中的应用", 《铁道建筑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897951A (en) * | 2021-02-04 | 2021-06-04 | 成都精准混凝土有限公司 | Concrete with volume weight of more than 5000kg per cubic meter and preparation method thereof |
| CN113149572A (en) * | 2021-05-28 | 2021-07-23 | 三一重机有限公司 | Counterweight concrete and preparation method thereof |
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Application publication date: 20201201 |