CN214573280U - Steel-concrete composite structure - Google Patents
Steel-concrete composite structure Download PDFInfo
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- CN214573280U CN214573280U CN202120342769.7U CN202120342769U CN214573280U CN 214573280 U CN214573280 U CN 214573280U CN 202120342769 U CN202120342769 U CN 202120342769U CN 214573280 U CN214573280 U CN 214573280U
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Abstract
The utility model discloses a steel-concrete composite construction: the method comprises the following steps: the steel structure layer, the zinc-rich primer layer, the epoxy cement mortar layer and the concrete layer; the zinc-rich primer layer is coated on the surface of the steel structure layer, the epoxy cement mortar layer is coated on the zinc-rich primer layer, and the concrete layer is laid on the epoxy cement mortar layer. The utility model discloses a purpose-built epoxy cement mortar of application between steel construction surface anticorrosive coating and concrete both can protect the steel construction anticorrosive coating not receive destruction, can increase the cohesion of steel-concrete faying face again, improve the durability of faying face, have very big application prospect.
Description
Technical Field
The utility model belongs to the technical field of steel-concrete complex, concretely relates to steel-concrete composite construction.
Background
The steel bridge is more and more widely applied due to the advantages of convenient construction, high erection speed, greenness and no pollution, and the steel-concrete combined section is an indispensable structure on the steel structure bridge.
The existing steel-concrete composite of the steel-concrete combination section generally adopts the steps of coating zinc-rich primer with the thickness of 30-60 mu m and then pouring concrete with the thickness of 80-200 mm. Because the concrete is difficult to compact and has insufficient impermeability, when the non-compact concrete is placed in the air or in an environment containing carbon dioxide, calcium hydroxide in the concrete reacts with the carbon dioxide to generate substances such as calcium carbonate and the like due to the invasion of the carbon dioxide, the alkalinity of the substances is gradually reduced or even disappears, the concrete is easy to carbonize, the adhesion of the zinc-rich primer on the steel-concrete joint surface is reduced, a paint layer falls off, and the surface of a steel plate is corroded and rusted. When the pH value of the concrete is less than 12, the zinc-rich primer protective layer on the steel-concrete combination surface is unstable, the protective film is damaged, the steel plate begins to be rusted, and the service life of the steel structure are reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems in the prior art, the present invention provides a steel-concrete composite structure;
the to-be-solved technical problem of the utility model is realized through following technical scheme:
a steel-concrete composite structure comprising: the steel structure layer, the zinc-rich primer layer, the epoxy cement mortar layer and the concrete layer; the surface of the steel structure layer is coated with a zinc-rich primer layer, the zinc-rich primer layer is coated with an epoxy cement mortar layer, and a concrete layer is laid on the epoxy cement mortar layer.
Further, the thickness of the zinc-rich primer layer is 30-60 mu m; the thickness of the epoxy cement mortar layer is 3-5 cm.
Furthermore, the epoxy cement mortar layer is formed by coating epoxy cement mortar, and the epoxy cement mortar is prepared from quartz sand, cement, epoxy resin coating, a toughening agent, a diluent and a closed curing agent.
Further, the preparation of the epoxy cement mortar comprises the following steps:
step one, mixing the quartz sand and the cement to obtain cement mortar, wherein the weight ratio of the quartz sand to the cement is 1: 4.9-5.45;
step two, after the epoxy resin coating is heated to a flowing state, the toughening agent and the diluent are added to enable the epoxy resin coating to be in a liquid state, and then the cement mortar obtained in the step one is added and is rapidly and uniformly mixed; the volume ratio of the epoxy resin coating to the cement mortar obtained in the first step is 1: 150-250; the volume ratio of the epoxy resin coating to the toughening agent is 100: 1-5; the volume ratio of the epoxy resin coating to the diluent is 2-5: 1;
and step three, adding the closed curing agent into the product obtained in the step two, and uniformly mixing to obtain the epoxy cement mortar, wherein the volume ratio of the closed curing agent to the epoxy cement mortar is 100-3-5.5.
The utility model has the advantages that:
1. the utility model discloses a purpose-built epoxy cement mortar of application between steel construction surface anticorrosive coating and concrete both can protect the steel construction anticorrosive coating not receive destruction, can increase the cohesion of steel-concrete faying face again, improve the durability of faying face, have very big application prospect.
2. The utility model discloses drop into lessly, the environmental protection, the practicality is strong, and convenient easy going, the operation requirement is low, and the value of using widely is high.
Drawings
Fig. 1 is a schematic structural sectional view of the present invention.
Description of reference numerals:
1-a steel structural layer; 2-a zinc rich primer layer; 3-epoxy cement mortar layer; 4-concrete layer.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
A steel-concrete composite structure comprising: the steel structure layer 1, the zinc-rich primer layer 2, the epoxy cement mortar layer 3 and the concrete layer 4; the surface of the steel structure layer 1 is coated with a zinc-rich primer layer 2, the zinc-rich primer layer 2 is coated with an epoxy cement mortar layer 3, and a concrete layer 4 is laid on the epoxy cement mortar layer 3.
Preferably, the thickness of the zinc-rich primer layer 2 is 30-60 μm; the thickness of the epoxy cement mortar layer 3 is 3-5 cm.
The epoxy cement mortar layer 3 is formed by coating epoxy cement mortar, and the epoxy cement mortar is prepared from quartz sand, cement, epoxy resin coating, a toughening agent, a diluent and a closed curing agent.
The preparation of the epoxy cement mortar comprises the following steps:
step one, mixing the quartz sand and the cement to obtain cement mortar, wherein the weight ratio of the quartz sand to the cement is 1: 4.9-5.45;
step two, after the epoxy resin coating is heated to a flowing state, the toughening agent and the diluent are added to enable the epoxy resin coating to be in a liquid state, and then the cement mortar obtained in the step one is added and is rapidly and uniformly mixed; the volume ratio of the epoxy resin coating to the cement mortar obtained in the first step is 1: 150-250; the volume ratio of the epoxy resin coating to the toughening agent is 100: 1-5; the volume ratio of the epoxy resin coating to the diluent is 2-5: 1;
and step three, adding the closed curing agent into the product obtained in the step two, and uniformly mixing to obtain the epoxy cement mortar, wherein the volume ratio of the closed curing agent to the epoxy cement mortar is 100-3-5.5.
The following description of the application of the present invention to a steel bridge is as follows:
step 1: sanding and performing anti-corrosion treatment on the surface of a steel structure of a steel-concrete combination section on a steel bridge according to a conventional technology, and then coating zinc-rich primer with the thickness of 30-60 mu m on all the surfaces of the steel structure to form a zinc-rich primer layer.
Step 2: according to the utility model discloses preparation step preparation epoxy cement mortar. The ambient temperature for preparing the epoxy cement mortar is performed according to the requirements of conventional cement mortars.
Wherein, after the epoxy resin coating is added with the fine quartz sand and matched with the cement to prepare the epoxy cement mortar, the compactness of the cement mortar can be naturally improved, and water and CO are avoided2Enters the steel-concrete joint surface and does not react with the alkali aggregate and the zinc-rich primer, so that the zinc-rich primer and the epoxy cement mortar respectively exert respective performances, thereby protecting the zinc-rich primer layer of the steel beam from being damaged. The purpose of adding the toughening agent is to improve the dynamic load bearing of the steel-concrete joint surface; the closed curing agent is added to further increase the compactness of the epoxy cement mortar and avoid water and CO2And entering a steel-concrete joint surface, and quickly solidifying and hardening the epoxy cement mortar so as to facilitate the next procedure construction.
Preferably, the toughening agent can be acetal resin or polyurethane resin; the diluent can be selected from ketone and benzene; the closed curing agent can be selected from polyurethanes and polyamides.
And step 3: after the steel-concrete joint section is hoisted and before a pavement concrete layer is laid, the steel-concrete joint surface of the steel-concrete joint section is washed clean, then the prepared epoxy cement mortar is uniformly coated on the steel-concrete joint surface, and the coating thickness is 3-5 cm, so that an epoxy cement mortar layer is formed.
And 4, step 4: and after the epoxy cement mortar layer is initially set, laying a concrete layer on the epoxy cement mortar layer.
The utility model can greatly improve the service life and service life of the steel-concrete combined section. The utility model is suitable for a bonding of steel construction and concrete also can be used to steel-concrete combination bridge, tunnel mine and have corrosive environment's concrete structures to repair etc. also can be used to in the construction of building, industry terrace to increase resistance to compression, shock resistance.
The utility model discloses an epoxy cement mortar chemical property of preparation is stable, and wear-resisting weatherability is good, and the consolidation body has high cohesive force, and high compressive strength just does not receive the structural shape restriction, has reinforcement, reinforced effect, and impervious, freeze proof, salt-tolerant, alkali-fast, weak acid corrosion resistance can be good, and its coefficient of thermal expansion is close with the concrete, so difficult follow the substrate that is bonded off, the durability is good.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (3)
1. A steel-concrete composite structure, comprising: the steel structure layer, the zinc-rich primer layer, the epoxy cement mortar layer and the concrete layer; the zinc-rich primer layer is coated on the surface of the steel structure layer, the epoxy cement mortar layer is coated on the zinc-rich primer layer, and the concrete layer is laid on the epoxy cement mortar layer.
2. The steel-concrete composite structure of claim 1, wherein the thickness of the zinc-rich primer layer is 30-60 μm; the thickness of the epoxy cement mortar layer is 3-5 cm.
3. A steel-concrete composite structure according to claim 1 or 2, wherein said epoxy cement mortar layer is coated with epoxy cement mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120342769.7U CN214573280U (en) | 2021-02-04 | 2021-02-04 | Steel-concrete composite structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120342769.7U CN214573280U (en) | 2021-02-04 | 2021-02-04 | Steel-concrete composite structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796206A (en) * | 2021-02-04 | 2021-05-14 | 中铁宝桥集团有限公司 | Steel-concrete composite structure |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796206A (en) * | 2021-02-04 | 2021-05-14 | 中铁宝桥集团有限公司 | Steel-concrete composite structure |
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