A road maintenance crack pouring device

Abstract

The utility model discloses a kind of crack pouring devices for highway maintenance, it is related to highway maintenance technical field, including crack pouring head, crack pouring pipe, one end is fixedly connected with the one end of crack pouring head, other end is connected with external feeding equipment, crack pouring pipe further includes: feeding pipe and heat preservation pipe, heat preservation pipe is coaxially sleeved in the outside of feeding pipe, and annular mounting cavity is formed between the outer wall of feeding pipe and the inner wall of heat preservation pipe, a plurality of electric heating wires, electric heating wire is arranged in helical extension along the axial direction of mounting cavity, one end of electric heating wire extends to the outside of crack pouring pipe and is connected with external power supply equipment, wherein, electric heating wire is integrally formed with a plurality of continuous and independent wave-shaped units along extension direction, solve the temperature of winding gap place of external winding type heat tracing band low, built-in simple straight wire only heat along pipeline axial direction, there is obvious temperature dead angle in circumference, all can lead to the problem that crack pouring material in pipe partially solidifies or flowability is poor.

Description

Technical Field

[0001] This utility model relates to the field of highway maintenance technology, specifically to a crack sealing device for highway maintenance. Background Technology

[0002] With the continuous improvement of my country's highway network, preventive maintenance of asphalt pavement cracks has become a key link in extending the service life of roads. Crack sealing technology is the core means of treating pavement cracks, and the development of high-performance heating systems is an important direction for improving the technical level of crack sealing devices.

[0003] Currently, most common highway crack sealing devices use externally wrapped heating tape or built-in simple straight wires to provide a heat source for the crack sealing pipe. The former achieves heating by wrapping the heating tape around the outer wall of the pipe and then insulating it; the latter attempts to embed or cast the electric heating element directly into the pipe wall material in order to obtain a more direct heat conduction effect.

[0004] However, the above-mentioned existing technologies have obvious defects: the temperature at the winding gaps of the externally wound heating cable is prone to be low, the built-in simple straight wire only heats up along the pipe axis, and there are obvious temperature dead zones in the circumference, all of which will cause the filling material inside the pipe to solidify locally or become less fluid. Utility Model Content

[0005] The purpose of this invention is to provide a crack sealing device for highway maintenance, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a crack sealing device for highway maintenance, comprising:

[0007] Crack filling head;

[0008] The crack filling pipe has one end fixedly connected to one end of the crack filling head and the other end connected to an external feeding device. The crack filling pipe also includes a feeding pipe and an insulation pipe. The insulation pipe is coaxially sleeved on the outside of the feeding pipe, and an annular installation cavity is formed between the outer wall of the feeding pipe and the inner wall of the insulation pipe.

[0009] A plurality of electric heating wires are arranged in a spiral manner along the axial direction of the mounting cavity, and one end of the electric heating wire extends to the outside of the grouting tube and is connected to an external power supply device.

[0010] The electric heating wire is integrally formed with several continuous and independent wave-shaped units along the extension direction. Under normal conditions, the peaks and troughs of adjacent wave-shaped units maintain a distance of 3 to 5 mm, and the axial displacement of each unit during maximum deformation does not exceed 1.5 mm.

[0011] Preferably, a plurality of the electric heating wires are distributed at equal intervals along the circumference of the mounting cavity, and the wavy units of each electric heating wire are staggered and arranged in a corresponding manner along the axial direction. The peaks and troughs of the wavy units of adjacent electric heating wires are arranged opposite each other, so that the plurality of wavy units together enclose and form a plurality of through holes evenly distributed along the axial direction in the mounting cavity.

[0012] Preferably, the vertical distance between the crests and troughs of the wave-shaped unit is 2 to 4 mm.

[0013] Preferably, the diameter of the electric heating wire is 0.8 to 1.5 mm.

[0014] Preferably, the angle between the spiral of the electric heating wire and the axis of the feeding tube is 15° to 25°.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention features a spiral-shaped, wave-like electric heating wire. The spiral extension ensures the heating wire fully wraps around the feed tube axially and circumferentially. The wave-shaped unit increases the contact area with air, resulting in more even heat transfer, eliminating localized hot and cold dead zones, and providing more uniform heating coverage. Furthermore, each continuous and independent wave-shaped unit not only reduces stress concentration through its bending angle design, effectively compensating for linear displacement caused by thermal expansion and contraction of the material, but also enhances overall rigidity with its spiral structure. This allows the structure to remain stable even after repeated deformation, extending the service life of the electric heating wire. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model after being disassembled.

[0018] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the electric heating wire in this utility model;

[0020] Figure 4 This is a schematic diagram of the structural disassembly of the grouting pipe of this utility model.

[0021] In the diagram: 1. Crack filling head; 2. Crack filling pipe; 21. Feeding pipe; 22. Insulation pipe; 3. Electric heating wire. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a crack sealing device for highway maintenance, including a crack sealing head 1; a crack sealing pipe 2, one end of which is fixedly connected to one end of the crack sealing head 1, and the other end is connected to an external feeding device. The crack sealing pipe 2 also includes a feeding pipe 21 and an insulation pipe 22, the insulation pipe 22 being coaxially sleeved on the outside of the feeding pipe 21, and an annular installation cavity being formed between the outer wall of the feeding pipe 21 and the inner wall of the insulation pipe 22; a plurality of electric heating wires 3, the electric heating wires 3 being spirally extended along the axial direction of the installation cavity, one end of the electric heating wires 3 extending to the outside of the crack sealing pipe 2 and connected to an external power supply device; wherein, the electric heating wires 3 are integrally formed with a plurality of continuous and independent wavy units along the extension direction. Under normal conditions, the peaks and troughs of adjacent wavy units maintain a distance of 3 to 5 mm, and the axial displacement of each unit during maximum deformation does not exceed 1.5 mm.

[0024] In the embodiments of the above technical solution, during use, in order to avoid uneven heating and the resulting local solidification or reduced fluidity of the filling material inside the pipe due to the filling head 1 only heating the filling tube 2 with the external winding heat tracing tape or the built-in simple straight wire when performing the filling operation;

[0025] Therefore, the feeding pipe 21 and the insulation pipe 22 together form a double-layered grouting pipe 2. Then, a spiral-shaped electric heating wire 3 is installed in the installation cavity between the feeding pipe 21 and the insulation pipe 22. The spiral extension allows the electric heating wire 3 to fully wrap around the feeding pipe 21 axially and circumferentially. The wave-shaped unit increases the contact area with air, making the heat transfer more even, eliminating local hot and cold dead zones, and making the heating coverage more uniform. When the feeding pipe 21 is stretched, the linear tension acting on the electric heating wire 3 will be converted into a torque that makes the spiral coil of the electric heating wire 3 "unfold". When it is compressed, it will be converted into a torque that makes the spiral coil "tighten". This bending stress is much less damaging to the metal wire than direct stretching. Moreover, multiple electric heating wires 3 are spirally arranged in parallel to share the stress caused by deformation, which makes the stress distribution more uniform and avoids single-point overload. Each continuous and independent wave-shaped unit can effectively compensate for the linear displacement caused by thermal expansion and contraction of the material, thereby reducing the possibility of cracks appearing in the electric heating wire 3 after long-term use.

[0026] Reference Figure 1 Several electric heating wires 3 are distributed at equal intervals along the circumference of the mounting cavity. The corrugated units of each electric heating wire 3 are staggered and arranged in a corresponding manner along the axial direction. The crests and troughs of the corrugated units of adjacent electric heating wires 3 are set opposite to each other, so that multiple corrugated units together enclose and form several through holes that are evenly distributed along the axial direction in the mounting cavity.

[0027] However, when several electric heating wires 3 are arranged at equal intervals along the circumference of the mounting cavity, the wavy units of the electric heating wires 3 are misaligned and correspondingly arranged along the axial direction, resulting in several through holes evenly distributed along the axial direction, such as... Figure 3 As shown, such through holes serve as airflow convection channels, which can accelerate the heat circulation in the installation cavity. Combined with the heat dissipation surface of the spiral wave-shaped electric heating wire 3, the heat can be evenly transferred to the outer wall of the feeding pipe 21, avoiding local high temperature or heat preservation dead corners. At the same time, it can also disperse the thermal stress in the installation cavity, reduce the impact of high temperature accumulation on the deformation of the grouting pipe 2, and improve the overall structural stability.

[0028] Reference Figure 3 The vertical distance between the crests and troughs of the wave-shaped unit is 2–4 mm.

[0029] The electric heating wire 3 will undergo axial displacement along with the grouting pipe 2. A vertical distance of 2-4mm allows the corrugated unit to fully expand or contract, satisfying the restriction that "maximum deformation axial displacement does not exceed 1.5mm". It also prevents the unit from being squeezed and deformed due to too small a distance, or from causing redundancy in the installation cavity due to too large a distance. If the distance exceeds 4mm, it will compress the effective insulation space in the installation cavity. If it is less than 2mm, the deformation margin of the corrugated unit will be insufficient, and it will be prone to fatigue fracture due to repeated deformation.

[0030] Reference Figure 3 The diameter of the electric heating wire 3 is 0.8 to 1.5 mm.

[0031] During crack sealing operations, the asphalt and other sealing materials must be maintained at a specific melting temperature. Heating too slowly can cause the material to solidify and block the feeding pipe, while excessive power can lead to energy waste and material deterioration. Therefore, a diameter of 0.8–1.5 mm allows the heating wire 3 to achieve a suitable resistance value. At this diameter, the heating wire 3 can heat up quickly after being energized, meeting the insulation requirements of the sealing pipe. Simultaneously, it avoids excessive power due to insufficient resistance or insufficient heating due to excessive resistance, thus meeting the continuous and stable heating requirements of crack sealing operations. If the diameter of the heating wire 3 is less than 0.8 mm, the thin wire is prone to bending and breakage due to mechanical forces during spiral winding and assembly, making it difficult to maintain a stable spiral shape and affecting heating uniformity. If the diameter exceeds 1.5 mm, it will significantly occupy the installation cavity space, potentially interfering with the feeding pipe 21 and insulation pipe 22, and compressing the heat dissipation and airflow space within the cavity. It will also result in an excessively large spiral structure, unable to meet the axial installation requirements of the sealing pipe.

[0032] Reference Figure 3 The angle between the spiral of the electric heating wire 3 and the axis of the feeding tube 21 is 15° to 25°.

[0033] Crack sealant is usually sensitive to temperature. Uneven temperature can easily lead to local clumping or poor flowability. When the angle is between 15° and 25°, the electric heating wire 3 can be wound around the outside of the feeding tube 21 with a reasonable pitch, ensuring that the crack sealant inside the tube is always in a stable temperature range and ensuring its flowability. If the angle is less than 15°, the electric heating wire 3 will be too close to parallel to the axis, resulting in insufficient coverage density of the electric heating wire 3 in the circumferential direction of the feeding tube 21, which can easily lead to local heating blind spots. If the angle exceeds 25°, the electric heating wire 3 will be wound too densely in a local area, which will cause heat to concentrate and generate "hot spots".

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crack sealing device for highway maintenance, characterized in that, include: Crack filling head (1); The crack filling pipe (2) has one end fixedly connected to one end of the crack filling head (1) and the other end connected to an external feeding device. The crack filling pipe (2) also includes a feeding pipe (21) and an insulation pipe (22). The insulation pipe (22) is coaxially sleeved on the outside of the feeding pipe (21), and an annular installation cavity is formed between the outer wall of the feeding pipe (21) and the inner wall of the insulation pipe (22). A plurality of electric heating wires (3) are arranged in a spiral manner along the axial direction of the mounting cavity, and one end of the electric heating wires (3) extends to the outside of the grouting pipe (2) and is connected to an external power supply device. The electric heating wire (3) is integrally formed with several continuous and independent wave-shaped units along the extension direction. Under normal conditions, the peaks and troughs of adjacent wave-shaped units maintain a distance of 3 to 5 mm, and the axial displacement of each unit during maximum deformation does not exceed 1.5 mm.

2. The crack sealing device for highway maintenance according to claim 1, characterized in that: Several electric heating wires (3) are distributed at equal intervals along the circumference of the mounting cavity. The wave-shaped units of each electric heating wire (3) are arranged in a staggered manner along the axial direction. The peaks and troughs of the wave-shaped units of adjacent electric heating wires (3) are arranged opposite each other, so that multiple wave-shaped units together enclose and form several through holes evenly distributed along the axial direction in the mounting cavity.

3. The crack sealing device for highway maintenance according to claim 1, characterized in that: The vertical distance between the crests and troughs of the wave-shaped unit is 2 to 4 mm.

4. A crack sealing device for highway maintenance according to claim 1, characterized in that: The diameter of the electric heating wire (3) is 0.8 to 1.5 mm.

5. A crack sealing device for highway maintenance according to claim 1, characterized in that: The angle between the spiral of the electric heating wire (3) and the axis of the feeding tube (21) is 15° to 25°.

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