Electric blanket of asphalt concrete core-wall combined layer and heating process of electric blanket

Abstract

The invention discloses an electric blanket of an asphalt concrete core-wall combined layer and a heating process thereof, and relates to the technical field of engineering construction, and the heating process comprises the following steps: cleaning floating dust on the surface of a construction area; a layer of canvas is laid on the asphalt concrete core wall; sequentially laying electric blankets on the surface of the canvas to ensure tight contact and firm fixation; installing power supply equipment; when the temperature of the surface layer of the core wall area where the electric blanket A is placed is increased to 70-90 DEG C, the forefront electric blanket A is removed, bituminous concrete pouring and compacting operation is conducted through a bituminous concrete paving vehicle, and the forefront removed electric blanket A is placed in the rear unheated core wall area to continue to be heated; repeating the method, and sequentially and forwards paving the electric blankets along the paving direction of the asphalt concrete; the method is suitable for asphalt concrete core wall construction in a cold region or a low-temperature environment, the operation difficulty is reduced, the construction progress is accelerated, and the construction quality of the joint surface is improved.

Description

Technical Field

[0001] The present invention relates to the field of engineering construction, and particularly to an electric heating blanket for the bonding surface of an asphalt concrete core wall and its heating process. Background Art

[0002] During the construction of a roller-compacted concrete core wall, it is not necessary to construct in segments along the dam axis, but it needs to be constructed in horizontal layers. Generally, the construction layer thickness is between 20 and 30 cm. Therefore, during the construction process, the interface between layers becomes the main weak part of the dam impervious body and is also the key point for construction quality control. According to the requirements in the "Code for Construction of Hydraulic Asphalt Concrete", if the surface temperature of the interface is lower than 70°C during the construction of the core wall, heating measures need to be taken to make the temperature of the bonding surface reach 70°C - 90°C. And for every 2 - 4 m increase in the asphalt concrete core wall, construction needs to stop for core drilling and sampling to detect the construction quality. Inevitably, the temperature of the bonding surface often cannot be maintained above 70°C, and the surface of the asphalt concrete core wall needs to be heated before the next layer of construction can be carried out.

[0003] Currently, the commonly used traditional surface heating processes include: flame torch heating process, infrared radiation heating process, hot sand heating process, and hot air circulation heating process, but the heating effects are not ideal. The flame torch is the most commonly used heating means in the construction of asphalt concrete core walls. However, the heating area of the flame is concentrated, the heat distribution is uneven, which easily leads to local overheating or insufficient heating of the asphalt concrete surface layer. The overheated area will cause asphalt aging and coking, while the insufficient heating area will affect the interlayer bonding quality. The heating temperature of the flame torch is difficult to accurately control, and it is greatly affected by the technical level of the operator and environmental factors (such as wind speed). The thermal energy utilization rate of the flame torch is low, most of the heat is dissipated into the air, and the heating depth is insufficient.

[0004] The infrared radiation heating process has a limited heating depth on the surface layer of the asphalt concrete core wall. The heating efficiency is greatly affected by environmental temperature, wind speed, and humidity. In a low-temperature or high-wind environment, the heat dissipation is fast, and the heating effect decreases, resulting in limited applicability. The initial investment cost of the infrared radiation heating equipment is relatively high, requiring a large investment budget. The uniformity of infrared auxiliary heating highly depends on the layout method and radiation range of the equipment, and has higher technical requirements for the operator.

[0005] The hot sand heating process needs to borrow the asphalt concrete mixing plant to heat thick hot sand. For the asphalt concrete core wall in a wide river valley, the demand is too large. The heating temperature is difficult to accurately control, and the cleaning work of the surface layer after heating is too heavy, which easily contaminates the bonding layer surface with dust. When the environmental temperature is too low, thicker hot sand is required to ensure the surface layer heating effect.

[0006] The hot air circulation heating process has high energy consumption and large operating costs. It is necessary to set up a warm shed on the surface of the core wall, which is not conducive to the construction of the core wall. It has high technical requirements for operators and requires precise control of wind speed and temperature.

[0007] The methods described above have many limitations in practical applications. And most of the existing electric blankets are designed with a single heating layer, lacking control over heat reflection and dissipation, and it is difficult to meet the construction requirements of core walls of different sizes. Therefore, an electric blanket for the bonding surface of asphalt concrete core walls and its heating process are needed to solve the above technical problems and propose improvements for the rapid construction of asphalt concrete core walls. Summary of the Invention

[0008] In view of this, the present invention provides an electric blanket for the bonding surface of asphalt concrete core walls and a heating process. Compared with the traditional surface heating process, the present invention is applicable to the construction of asphalt concrete core walls in cold regions or low-temperature environments. This process reduces the operation difficulty, speeds up the construction progress, and improves the construction quality of the bonding surface.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A heating process for an electric blanket of the bonding surface of an asphalt concrete core wall includes the following steps:

[0011] Step 1, first clean the surface dust of the construction area;

[0012] Step 2, lay a layer of canvas on the asphalt concrete core wall to prevent the asphalt from softening after heating and sticking to the electric blanket;

[0013] Step 3, lay multiple electric blankets on the surface of the canvas in sequence, ensuring close contact and firm fixation;

[0014] Step 4, install the power supply equipment, set the heating temperature of the temperature controller to 160 °C, and start the electric blanket to heat;

[0015] Step 5, when the surface temperature of the core wall area where the electric blanket is placed is heated to 70 °C - 90 °C, remove the frontmost electric blanket, carry out the pouring and compaction operations of asphalt concrete through the asphalt concrete paver, and place the frontmost removed electric blanket on the unheated core wall area at the back to continue heating;

[0016] Step 6, repeat the method in Step 5, and lay the electric blankets forward in sequence along the direction of asphalt concrete paving to ensure that the core wall at the back is heated cyclically, so as to ensure that heating and paving do not interfere with each other and continuous construction can be carried out.

[0017] Further, the input end of the electric blanket is electrically connected to the output end of the power supply equipment.

[0018] An electric blanket for the bonding surface of an asphalt concrete core wall, comprising:

[0019] A layered main body, which includes a waterproof and wear-resistant layer, a heat-insulating and reflective layer, a heating layer, and a flexible support layer stacked in sequence;

[0020] A gear regulator for selecting the temperature heating gear of the electric blanket;

[0021] A magnetic adsorption fixing band for fixing on the surface of the asphalt concrete core wall;

[0022] The magnetic adsorption fixing band is detachably connected to the edge of the layered main body, and the layered main body is connected with a gear regulator.

[0023] Furthermore, cross-ripple anti-slip patterns are pressed on the outer surface of the waterproof and wear-resistant layer.

[0024] Furthermore, the heat-insulating and reflective layer is made of aluminum foil composite fiberglass cloth.

[0025] Furthermore, the heating layer includes carbon fiber heating wires arranged in a serpentine shape. The carbon fiber heating wires are connected with a temperature control system. The temperature control system is located between the heat-insulating and reflective layer and the heating layer, and the temperature control system is electrically connected with the gear regulator.

[0026] Furthermore, the temperature control system includes a temperature sensor and a temperature controller. The carbon fiber heating wires and the temperature sensor are both electrically connected with the temperature controller.

[0027] Furthermore, the flexible support layer is made of a closed-cell foamed polyethylene pad.

[0028] Furthermore, the magnetic adsorption fixing band includes a magnetic adsorption sub-band and a magnetic adsorption mother-band. Magnetic adsorption sub-buckles are arranged on the magnetic adsorption sub-band, and a plurality of magnetic adsorption mother-buckles are arranged at intervals on the magnetic adsorption mother-band. The magnetic adsorption sub-buckles and the magnetic adsorption mother-buckles are magnetically connected.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. Precise and controllable temperature: good heating uniformity, less impact on the thermal aging of asphalt materials, large temperature adjustable range, and strong adaptability.

[0031] 2. Simple and efficient operation: The method is simple to operate, quick to arrange, does not require complex equipment, is convenient to carry, and has low requirements for the technical level of operators.

[0032] 3. Deep heating depth: The electric blanket heating process not only heats the surface layer, but also has good effects at a depth of 20 cm, and has better effects on the bonding of the bonding surface.

[0033] 4. Recyclability: For the asphalt concrete core wall in a wide river valley, it is not necessary to pave and heat the entire cross-section. The asphalt concrete is paved at 1 m / min, and only a certain number of electric blankets are needed for recycling heating, and the core wall can be heated while construction is in progress.

[0034] 5. Less environmental requirements: Wind speed, weather and temperature environment have little impact on the heating of electric blankets, and the electric blanket heating process can also prevent the asphalt concrete core wall from dissipating heat outward, further ensuring the heating and temperature rising effect.

[0035] 6. The waterproof and wear-resistant layer of the layered main body can improve the compressive resistance and friction. The heat insulation and reflection layer can reflect the internal heat and block the external low temperature, reducing heat loss. By selecting different heating temperatures, the carbon fiber heating wires in the heating layer are used for heating to ensure uniform heating. The flexible support layer can also provide buffering and enhance the overall flexibility of the electric blanket, optimizing the heat conduction efficiency, significantly improving the construction adaptability and energy utilization rate, and solving the problems of high energy consumption, uneven temperature and poor adaptability of traditional heating devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0037] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 It is a flowchart of the steps of the present invention;

[0039] Figure 3 It is a schematic diagram of the overall structure of the electric blanket;

[0040] Figure 4 It is a schematic diagram of the structure of the layered main body;

[0041] Figure 5 It is a schematic diagram of the structure of the heating layer;

[0042] Figure 6 It is a schematic diagram of the structure of the magnetic adsorption fixing belt;

[0043] Among them, in the figure:

[0044] 1 - Layered main body; 2 - Magnetic adsorption fixing belt; 3 - Gear regulator; 4 - Waterproof and wear-resistant layer; 5 - Heat insulation and reflection layer; 6 - Heating layer; 7 - Flexible support layer; 8 - Carbon fiber heating wire; 9 - Temperature sensor; 10 - Temperature controller; 11 - Magnetic adsorption sub-belt; 12 - Magnetic adsorption mother-belt; 13 - Magnetic adsorption sub-buckle; 14 - Magnetic adsorption mother-buckle; 15 - Canvas; 16 - Asphalt concrete core wall. Specific implementation mode

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Please refer to the attached Figure 1-2 This invention provides an electric blanket heating process for the combined surface of an asphalt concrete core wall. An electric blanket heating process for the combined surface of an asphalt concrete core wall includes the following steps:

[0047] Step 1, first clean the surface dust of the construction area;

[0048] Step 2, lay a layer of canvas 15 on the asphalt concrete core wall 16 to prevent the asphalt from softening after heating and sticking to the electric blanket;

[0049] Step 3, sequentially lay electric blankets A, B, C, E, and F on the surface of the canvas 15 to ensure close contact and firm fixation;

[0050] Step 4, install the power supply equipment, set the heating temperature of the temperature controller 10 to 160 °C, and start heating the electric blanket;

[0051] Step 5, when the surface temperature of the core wall area where the electric blanket is placed is heated to 70 °C - 90 °C, remove the frontmost electric blanket, carry out the pouring and compaction operations of asphalt concrete through an asphalt concrete paver, and place the removed frontmost electric blanket in the unheated core wall area at the back for continuous heating;

[0052] Step 6, repeat the method in Step 5, and sequentially spread the electric blanket forward along the direction of asphalt concrete paving to ensure that the core wall at the back is heated in a cycle, so as to ensure that heating and paving do not interfere with each other and continuous construction can be carried out.

[0053] Preferably, the input end of the electric blanket is electrically connected to the output end of the power supply equipment.

[0054] Please refer to the attached Figure 3-6 This invention provides an electric blanket for the combined surface of an asphalt concrete core wall, including:

[0055] A layered main body 1, wherein the layered main body 1 comprises a waterproof and wear-resistant layer 4, a heat-insulating and reflective layer 5, a heating layer 6 and a flexible support layer 7 which are laminated in sequence;

[0056] A gear regulator 3 for selecting the temperature heating gear of the electric blanket;

[0057] A magnetic fixing belt 2 for fixing on the surface of the asphalt concrete core wall 16;

[0058] The magnetic fixing belt 2 is detachably connected to the edge of the layered main body 1, and the layered main body 1 is connected with a gear regulator 3.

[0059] Preferably, the outer surface of the waterproof and wear-resistant layer 4 is pressed with cross-ripple anti-slip patterns, and the waterproof and wear-resistant layer 4 is made of high-strength PVC-coated fabric, which can improve the compressive resistance and friction force.

[0060] Preferably, the heat-insulating and reflective layer 5 is made of aluminum foil composite fiberglass cloth. The aluminum foil surface is smooth and dense. By the principle of specular reflection, the long-wave infrared radiation emitted by the heating layer 6 is reflected to the concrete surface, avoiding the escape of heat in the form of radiation, and can also play the role of blocking the external low temperature.

[0061] Preferably, the heating layer 6 comprises carbon fiber heating wires 8 arranged in a serpentine shape. The carbon fiber heating wires 8 are connected with a temperature control system. The temperature control system is located between the heat-insulating and reflective layer 5 and the heating layer 6, and the temperature control system is electrically connected with the gear regulator 3 to ensure uniform heating.

[0062] Preferably, the temperature control system comprises a temperature sensor 9 and a temperature controller 10. The carbon fiber heating wires 8 and the temperature sensor 9 are both electrically connected with the temperature controller 10.

[0063] Preferably, the flexible support layer 7 is made of a closed-cell foamed polyethylene pad, which can provide buffering and enhance the overall flexibility of the electric blanket.

[0064] Preferably, the magnetic fixing belt 2 comprises a magnetic sub-belt 11 and a magnetic mother-belt 12. A magnetic sub-button 13 is arranged on the magnetic sub-belt 11, and a plurality of magnetic mother-buttons 14 are arranged at intervals on the magnetic mother-belt 12. The magnetic sub-button 13 and the magnetic mother-buttons 14 are magnetically connected to adapt to the anchoring points on the steel formwork or the concrete surface.

[0065] Example 1:

[0066] In an environment of -10°C, at a speed of 1 m / min for the paving machine and with an electric blanket 5 m long, when the surface of the core wall is 10°C, 75 electric blankets are required; when it is 20°C, 52 electric blankets are required; when it is 30°C, 37 electric blankets are required; when it is 40°C, 25 electric blankets are required; and when it is 50°C, 18 electric blankets are required to ensure heating the core wall in a cycle without affecting the construction. After the construction is completed, the electric blankets and canvas 15 are removed, and the integrity of the equipment is checked.

[0067] The specific usage method of the present invention is as follows:

[0068] Lay the electric blanket to the target position and fix it with the magnetic adsorption fixing belt 2. After connecting the external power supply, heating can be carried out. If it is necessary to increase the temperature of the electric blanket, the temperature heating gear of the electric blanket can be adjusted by using the gear regulator 3.

[0069] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add, delete or make other adjustments to the features in the embodiments of the present invention according to the situation, so as to obtain different technical solutions that are essentially not divorced from the concept of the present invention, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. An electrothermal blanket heating process for the bonding surface of an asphalt concrete core wall, characterized in that, It includes the following steps: Step 1: First, clean the surface dust of the construction area. Step 2: Lay a layer of canvas (15) on the asphalt concrete core wall (16) to prevent the asphalt from softening after heating and sticking to the electric blanket. Step 3: Lay multiple electric blankets on the surface of the canvas (15) in sequence, ensuring close contact and firm fixation. Step 4: Install the power supply equipment, set the heating temperature of the temperature controller (10) to 160 °C, and start heating the electric blanket. Step 5: When the surface temperature of the core wall area where the electric blanket is placed is heated to 70 °C - 90 °C, remove the frontmost electric blanket, perform the pouring and compaction operations of asphalt concrete through the asphalt concrete paver, and place the removed frontmost electric blanket on the unheated core wall area at the back for continuous heating. Step 6: Repeat the method in Step 5, and lay the electric blankets forward in sequence along the direction of asphalt concrete paving, ensuring that the core wall at the back is heated cyclically to ensure that heating and paving do not interfere with each other and continuous construction can be carried out.

2. The electrothermal blanket heating process for the bonding surface of the asphalt concrete core wall according to claim 1, characterized in that, In Step 4, the input end of the electric blanket is electrically connected to the output end of the power supply equipment.

3. An electric blanket for the bonding surface of an asphalt concrete core wall, characterized in that It includes: A layered main body (1), which includes a waterproof and wear-resistant layer (4), a heat-insulating and reflective layer (5), a heating layer (6), and a flexible support layer (7) that are sequentially laminated. A gear regulator (3) for selecting the temperature heating gear of the electric blanket. A magnetic adsorption fixing belt (2) for fixing on the surface of the asphalt concrete core wall (16). The magnetic adsorption fixing belt (2) is detachably connected to the edge of the layered main body (1), and the layered main body (1) is connected with a gear regulator (3).

4. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 3, characterized in that, The outer surface of the waterproof and wear-resistant layer (4) is pressed with cross-ripple anti-slip patterns.

5. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 3, characterized in that, The heat-insulating and reflective layer (5) is made of aluminum foil composite fiberglass cloth.

6. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 3, characterized in that, The heating layer (6) includes carbon fiber heating wires (8) arranged in a serpentine shape. The carbon fiber heating wires (8) are connected with a temperature control system. The temperature control system is located between the heat-insulating and reflective layer (5) and the heating layer (6), and the temperature control system is electrically connected to the gear regulator (3).

7. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 6, characterized in that, The temperature control system includes a temperature sensor (9) and a temperature controller (10). The carbon fiber heating wires (8) and the temperature sensor (9) are both electrically connected to the temperature controller (10).

8. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 3, characterized in that, The flexible support layer (7) is made of a closed-cell foamed polyethylene pad.

9. An electric blanket for the bonding surface of an asphalt concrete core wall according to claim 3, characterized in that The magnetic adsorption fixing belt (2) includes a magnetic adsorption sub-belt (11) and a magnetic adsorption mother-belt (12). The magnetic adsorption sub-belt (11) is provided with magnetic adsorption sub-buckles (13), and a plurality of magnetic adsorption mother-buckles (14) are arranged at intervals on the magnetic adsorption mother-belt (12). The magnetic adsorption sub-buckles (13) and the magnetic adsorption mother-buckles (14) are magnetically connected.

Images