阅读说明：本技术 一种钢混结合梁的薄壁混凝土加热养护方法 (Heating maintenance method for thin-wall concrete of steel-concrete composite beam ) 是由 王稼振 闫斌 代建兵 张忠伟 周功建 徐春旺 王俊峰 高克方 宋忠民 张根基 于 2019-08-28 设计创作，主要内容包括：本发明公开了一种钢混结合梁的薄壁混凝土加热养护方法,包括如下步骤：在钢梁钢板上表面铺设并固定多根碳纤维发热线；在钢梁钢板上表面浇筑混凝土,收面后形成薄壁混凝土；在所述薄壁混凝土上铺设保湿层；在所述保湿层上铺设保温层；在所述薄壁混凝土外侧铺设电缆；将各所述碳纤维发热线的插头分别插接于所述电缆的各电缆插头上；所述碳纤维发热线工作,并产生热量。本发明应用了碳纤维发热线给混凝土的养护提供热源,且碳纤维发热线布置在钢梁钢板于薄壁混凝土之间,很好地解决了薄壁混凝土底部临空面的养护问题。(The invention discloses a heating maintenance method for thin-wall concrete of a steel-concrete composite beam, which comprises the following steps: laying and fixing a plurality of carbon fiber heating wires on the upper surface of the steel beam steel plate; pouring concrete on the upper surface of the steel beam steel plate, and forming thin-wall concrete after the surface is collected; paving a moisture-preserving layer on the thin-wall concrete; laying a heat-insulating layer on the moisture-preserving layer; laying a cable on the outer side of the thin-wall concrete; inserting the plug of each carbon fiber heating wire into each cable plug of the cable respectively; the carbon fiber heating wire works and generates heat. The invention applies the carbon fiber heating wire to provide a heat source for the maintenance of the concrete, and the carbon fiber heating wire is arranged between the steel beam and the steel plate of the thin-wall concrete, thereby well solving the maintenance problem of the empty surface at the bottom of the thin-wall concrete.)

1. A heating maintenance method for thin-wall concrete of a steel-concrete composite beam is characterized by comprising the following steps:

laying and fixing a plurality of carbon fiber heating wires (2) on the upper surface of the steel beam steel plate (1);

concrete is poured on the upper surface of the steel beam steel plate (1), and thin-wall concrete (3) is formed after the surface is collected;

paving a moisture-preserving layer (4) on the thin-wall concrete (3);

a heat-insulating layer (5) is laid on the moisture-preserving layer (4);

laying a cable on the outer side of the thin-wall concrete (3);

the plug of each carbon fiber heating wire (2) is respectively plugged into each cable plug of the cable;

the carbon fiber heating wire (2) works and generates heat.

2. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam according to claim 1,

when concrete is poured on the upper surface of the steel beam steel plate (1), the method further comprises the following steps:

providing a temperature control display and a plurality of temperature sensors, wherein each temperature sensor is connected with the temperature control display;

laying the temperature sensor in concrete;

before the carbon fiber heating wire (2) works and generates heat, the method further comprises the following steps:

and connecting the temperature control display to the cable, and setting the heating temperature through the temperature control display.

3. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: the distance between two adjacent carbon fiber heating wires (2) is 8-10 cm.

4. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: and paving a plastic film on the thin-wall concrete (3) and forming the moisture-keeping layer (4).

5. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: an electric blanket is laid on the moisture-preserving layer (4) to form the heat-preserving layer (5), and the electric blanket is communicated with a power supply.

6. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: and cotton quilts are paved on the moisturizing layer (4) to form the heat-insulating layer (5).

7. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: an electric blanket and a quilt are sequentially laid on the moisture retention layer (4) from bottom to top to form the heat insulation layer (5), and the electric blanket is communicated with a power supply.

8. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 1, wherein: and a protective layer for preventing rain and snow erosion is laid on the heat-insulating layer (5).

9. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 8, wherein: and the protective layer is provided with a ballast for pressing the protective layer.

10. The method for heating and curing the thin-walled concrete of the steel-concrete composite beam as recited in claim 8, wherein: the protective layer is made of plastic shed cloth.

Technical Field

The invention relates to the technical field of bridge construction, in particular to a heating maintenance method for thin-wall concrete of a steel-concrete composite beam.

Background

With the rapid development of the basic engineering construction of China, a plurality of bridges in the form of steel-concrete combination beams are designed and constructed in recent years, the structural form is novel, the design style is elegant, the construction technology is more and more mature in continuous construction, the improvement and innovation of the construction technology in the bridge construction process are the targets of consistent pursuit of builders, and under the severe requirements of the country and the industry on the engineering quality, new processes, new methods and new tools need to be continuously explored for ensuring the construction period.

Referring to fig. 1, in the steel-concrete composite beam, prefabricated bridge deck boards 6 are laid on a steel beam steel plate 1, a wet joint 7 is reserved between every two adjacent prefabricated bridge deck boards 6, thin-wall concrete 3 needs to be cast in the wet joint 7 in situ, the bottom of the thin-wall concrete 3 is the steel beam steel plate 1, the thickness of the steel beam steel plate 1 is about 24mm, the steel beam steel plate 1 cannot keep the heat needed by the maintenance of the thin-wall concrete 3 in winter due to the good heat dissipation performance of the steel beam steel plate 1, the lower surface of the steel beam steel plate 1 is an empty surface, an existing railway business line is arranged right below the empty surface, and the existing railway business line cannot be maintained in heat preservation by any wrapping object.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a heating maintenance method for thin-wall concrete of a steel-concrete composite beam, which can well maintain cast-in-place thin-wall concrete.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a heating maintenance method for thin-wall concrete of a steel-concrete composite beam comprises the following steps:

laying and fixing a plurality of carbon fiber heating wires on the upper surface of the steel beam steel plate;

pouring concrete on the upper surface of the steel beam steel plate, and forming thin-wall concrete after the surface is collected;

paving a moisture-preserving layer on the thin-wall concrete;

laying a heat-insulating layer on the moisture-preserving layer;

laying a cable on the outer side of the thin-wall concrete;

inserting the plug of each carbon fiber heating wire into each cable plug of the cable respectively;

the carbon fiber heating wire works and generates heat.

Further, when concrete is poured on the upper surface of the steel beam and the steel plate, the method further comprises the following steps:

providing a temperature control display and a plurality of temperature sensors, wherein each temperature sensor is connected with the temperature control display;

laying the temperature sensor in concrete;

before the carbon fiber heating wire works and generates heat, the method further comprises the following steps:

and connecting the temperature control display to the cable, and setting the heating temperature through the temperature control display.

Further, the distance between two adjacent carbon fiber heating wires is 8-10 cm.

Further, a plastic film is laid on the thin-wall concrete, and the moisture-keeping layer is formed.

Further, an electric blanket is laid on the moisture preservation layer to form the heat preservation layer, and the electric blanket is communicated with a power supply.

Further, a cotton quilt is laid on the moisture preservation layer, and the heat preservation layer is formed.

Further, an electric blanket and a quilt are sequentially laid on the moisture retention layer from bottom to top to form the heat insulation layer, and the electric blanket is communicated with a power supply.

Furthermore, a protective layer for preventing rain and snow erosion is laid on the heat-insulating layer.

Furthermore, a ballast for pressing the protective layer is placed on the protective layer.

Furthermore, the protective layer adopts plastic shed cloth.

Compared with the prior art, the invention has the advantages that:

the invention applies the carbon fiber heating wire to provide a heat source for the maintenance of the concrete, and the carbon fiber heating wire is arranged between the steel beam steel plate and the thin-wall concrete, thereby well solving the maintenance problem of the empty surface at the bottom of the thin-wall concrete.

The carbon fiber heating wire adopted by the invention is very thin, the diameter is only 2.5mm, and the combination of concrete and steel beams is hardly influenced.

The carbon fiber heating wire is connected with a power supply through a cable, the power supply is connected with the cable, and the cable is connected with the carbon fiber heating wire through a movable cable plug; the cable installs the control by temperature change display additional with the power connection department, and the control by temperature change display can compare with the settlement temperature according to the temperature of heating, decides whether heat or keep warm to show real-time temperature, realized intelligent accuse temperature.

According to the invention, the top surface of the thin-wall concrete is covered with articles such as a plastic film, an electric blanket, a cotton quilt and the like, and a curing temperature of 30-40 ℃ is built for the thin-wall concrete by matching with the carbon fiber heating wire on the bottom surface of the concrete, so that the construction quality of the concrete in winter is ensured, the curing speed of the concrete is accelerated, and the construction period is greatly saved.

Drawings

FIG. 1 is a schematic plan view of a prefabricated bridge deck laid on a steel beam and a steel plate;

fig. 2 is a schematic view of heating and curing of thin-walled concrete of a steel-concrete composite beam provided by an embodiment of the invention.

In the figure: 1. a steel beam and a steel plate; 2. a carbon fiber heating wire; 3. thin-walled concrete; 4. a moisture retention layer; 5. a heat-insulating layer; 6. prefabricating a bridge deck; 7. and (5) wet seaming.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Referring to fig. 2, an embodiment of the present invention provides a method for heating and curing thin-walled concrete of a steel-concrete composite beam, including the following steps:

s1: providing a temperature control display and a plurality of temperature sensors, wherein each temperature sensor is connected with the temperature control display; laying and fixing a plurality of carbon fiber heating wires 2 on the upper surface of a steel beam steel plate 1;

the carbon fiber heating wire 2 is in a 12K specification, the diameter is only 2.5mm, the carbon fiber heating wire 2 is fully paved on the upper surface of the steel beam steel plate 1 at intervals of 8-10 cm, the interval of the embodiment can be set to 10cm, the carbon fiber heating wire 2 and the steel beam steel plate 1 are fixedly bonded by adopting strong glue at intervals of about 40cm, and all plastic materials of the carbon fiber heating wire 2 are wrapped by plugs and connected and are temporarily fixed on auxiliary reinforcing steel bars higher than the upper surface of the thin-wall concrete 3;

s2: concrete is poured on the upper surface of the steel beam steel plate 1, a temperature sensor is laid in the concrete, and thin-wall concrete 3 is formed after the surface is collected;

s3: paving a moisture retention layer 4 on the thin-wall concrete 3 to maintain the humidity of the surface of the thin-wall concrete 3, wherein in the embodiment, the moisture retention layer 4 is a plastic film;

s4: an insulating layer 5 is laid on the moisture preservation layer 4, and the insulating layer 5 is used for preserving heat of the top surface of the thin-wall concrete 3 so as to prevent the temperature of the thin-wall concrete 3 from being dissipated; the heat preservation layer 5 can adopt a cotton quilt, and the cotton quilt is laid on the moisture preservation layer 4 to form the heat preservation layer 5; an electric blanket can be used, the electric blanket is laid on the moisture preservation layer 4 to form a heat preservation layer 5, and the electric blanket is communicated with a power supply and used for providing the heat source for the top surface of the thin-wall concrete 3; or the electric blanket and the cotton quilt are sequentially laid on the moisture preservation layer 4 from bottom to top to form a heat preservation layer 5, the electric blanket is communicated with the power supply, and the cotton quilt can protect the environment heat of the thin-wall concrete 3 from being easily dissipated.

S5: a protective layer is laid on the heat insulation layer 5 to prevent erosion of rain and snow, and the protective layer of the embodiment adopts plastic shed cloth; the protective layer is provided with a ballast for pressing the protective layer, such as heavy objects like steel bars or steel pipes, so that more heat loss caused by blowing and scraping of natural wind is avoided, and meanwhile, the danger that the covering objects fall to the under-bridge railway business line is also avoided.

S6: laying a cable on the prefabricated bridge deck 6 outside the thin-wall concrete 3;

s7: connecting a temperature control display to the cable, setting the heating temperature through the temperature control display, generally to be 30-40 ℃, and respectively plugging the plug of each carbon fiber heating wire 2 onto each cable plug of the cable;

s8: the carbon fiber heating wire 2 operates and generates heat.

In conclusion, the carbon fiber heating wire is used for providing a heat source for concrete maintenance, and the carbon fiber heating wire is arranged between the steel beam steel plate and the thin-wall concrete, so that the problem of maintenance of the empty surface at the bottom of the thin-wall concrete is well solved.

The carbon fiber heating wire adopted by the invention is very thin, the diameter is only 2.5mm, and the combination of concrete and steel beams is hardly influenced.

The invention adopts the same joint mode of 'electric floor heating', and the plug connection of the full plastic package ensures the electricity safety, ensures the material to be used circularly and is more convenient to operate.

The carbon fiber heating wire is connected with a power supply through a cable, the power supply is connected with the cable, and the cable is connected with the carbon fiber heating wire through a movable cable plug; the cable installs the control by temperature change display additional with the power connection department, and the control by temperature change display can compare with the settlement temperature according to the temperature of heating, decides whether heat or keep warm to show real-time temperature, realized intelligent accuse temperature.

According to the invention, the top surface of the thin-wall concrete is covered with articles such as a plastic film, an electric blanket, a cotton quilt and the like, and a curing temperature of 30-40 ℃ is built for the thin-wall concrete by matching with the carbon fiber heating wire on the bottom surface of the concrete, so that the construction quality of the concrete in winter is ensured, the curing speed of the concrete is accelerated, and the construction period is greatly saved.

The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.