Prestressed duct temperature and humidity monitoring and heating device

Abstract

The utility model discloses a kind of prestressed duct temperature and humidity monitoring and heating device, it is related to concrete maintenance technical field, including to pass through the prestressed tendon of prestressed duct, a plurality of annular pedestals are fixedly connected on prestressed tendon, temperature and humidity sensor is embedded in annular pedestal side surface, the outer surface of annular pedestal is coaxially fixedly connected with outer annular heat conduction plate, heating wire is connected between the outer annular heat conduction plate of adjacent annular pedestal, heating wire is electrically connected with the power supply outside prestressed duct by wire, control panel for controlling heating wire heating is also provided on wire, temperature and humidity sensor is connected with display by wire, display is located outside prestressed duct.This new type can be aimed at the real-time detection of temperature and humidity in prestressed duct, and with heating function, can be selected under suitable temperature and humidity conditions according to need to carry out grouting or after heating grouting, it can also be heated when temperature is low within two days after grouting, so as to ensure the quality of prestressed duct grouting molding.

Description

Technical Field

[0001] This invention relates to the field of concrete curing technology, specifically to a prestressed duct temperature and humidity monitoring and heating device. Background Technology

[0002] Prestressed beams are typically constructed using the post-tensioning method, which, in contrast to the pre-tensioning method, involves pouring concrete first, and then tensioning the prestressing steel after the concrete has reached at least 75% of its design strength to form a prestressed concrete member. The pre-tensioning method, on the other hand, involves tensioning the prestressing steel first, followed by pouring concrete. This method is more suitable for precast components; cast-in-place components are often constructed using the post-tensioning method.

[0003] During winter construction of concrete, if the ambient temperature is very low after the prestressed beam is tensioned, grouting is risky, as the grout material is easily frozen, leading to cracks along the prestressing ducts in the beam. Therefore, monitoring the temperature of the prestressing ducts during winter construction is crucial. Firstly, it allows for determining the timing of grouting operations; if the duct temperature is low, grouting should be avoided or the grout should be heated before grouting. Secondly, the temperature change of the grout should be monitored for the first two days after grouting to prevent premature freezing. If the temperature drops sharply after grouting, measures should be taken to heat the grout. Currently, there is a lack of devices for monitoring the temperature and humidity inside the prestressing ducts and for heating them; therefore, it is necessary to improve existing technologies. Utility Model Content

[0004] This invention provides a prestressed duct temperature and humidity monitoring and heating device, which aims to achieve real-time temperature and humidity monitoring and heating of the prestressed duct, thereby avoiding the problem of poor duct grouting quality caused by excessively low temperature.

[0005] To achieve the above objectives, the technical solution of this invention is as follows: A prestressed duct temperature and humidity monitoring and heating device includes a prestressing tendon for passing through the prestressed duct. Multiple annular bases are fixedly connected to the prestressing tendon. Temperature and humidity sensors are embedded in the side surfaces of the annular bases. An outer annular heat-conducting plate is coaxially fixedly connected to the outer surface of the annular base. Heating wires are connected between the outer annular heat-conducting plates of adjacent annular bases. The heating wires are electrically connected to a power source outside the prestressed duct via wires. A control panel for controlling the heating of the heating wires is also provided on the wires. The temperature and humidity sensors are connected to a display via wires, and the display is located outside the prestressed duct.

[0006] Preferably, the annular base is made of insulating material, the outer annular heat-conducting plate is made of metallic heat-conducting material, the axial width of the outer annular heat-conducting plate is greater than the axial width of the annular base, and the outer surface of the annular base is tightly attached to and fixedly connected to the inner surface of the outer annular heat-conducting plate.

[0007] Preferably, the heating wire has a spiral structure and is sleeved on the outer periphery of the prestressed tendon. The two ends of the heating wire are respectively connected to the corresponding outer annular heat-conducting plate. The outer surface of the outer annular heat-conducting plate and the outer surface of the heating wire are both insulated. Multiple first fin heat dissipation fins are also evenly distributed on the outer periphery of the outer annular heat-conducting plate.

[0008] Preferably, the first fin heat sink has a plate-type structure.

[0009] Preferably, the first fin heat sink is a plate structure folded into an arc shape.

[0010] Preferably, the heating wire is further provided with a plurality of second fin heat sinks evenly distributed on it.

[0011] Preferably, the second fin heat sink has a triangular plate-shaped structure.

[0012] Preferably, the inner surface of the annular base is provided with an inner annular heat-conducting plate, the inner annular heat-conducting plate is fixedly connected to the outer surface of the prestressing tendon through a telescopic mechanism, and the inner annular heat-conducting plate and the outer annular heat-conducting plate are connected on the same side edge through a heat-conducting connecting plate.

[0013] Preferably, the telescopic mechanism includes an arc-shaped pressure plate made of thermally conductive metal material, a sleeve, a first screw, and a second screw. The first screw and the second screw are arranged opposite to each other along the radial direction of the inner annular heat-conducting plate. The inner wall of the sleeve is provided with internal threads in opposite directions. The ends of the first screw and the second screw away from the sleeve are respectively fixedly connected to the inner surface of the inner annular heat-conducting plate and the middle of the outer surface of the arc-shaped pressure plate. The opposite ends of the first screw and the second screw are screwed to both ends of the sleeve. When the sleeve is rotated, the first screw and the second screw move simultaneously away from or towards the sleeve. The arc-shaped pressure plate is used in conjunction with the outer surface of the prestressing tendon. There are at least two telescopic mechanisms, and the two telescopic mechanisms are symmetrically arranged on both sides of the prestressing tendon.

[0014] This novel prestressed duct temperature and humidity monitoring and heating device has the following beneficial effects: This new type of grouting can detect the temperature and humidity inside the prestressed duct in real time and has a heating function. Grouting can be carried out under appropriate temperature and humidity conditions or after heating, as needed. Within two days after grouting, heating can also be carried out when the temperature is low, thereby ensuring the quality of grouting of the prestressed duct. Attached Figure Description

[0015] Figure 1 A schematic diagram of the overall structure of this invention in use; Figure 2 Side view of the novel annular base; Figure 3A schematic diagram of the first fin heat sink of this novel type when it is a plate structure folded into an arc shape; 1: Prestressed duct, 2: Corrugated pipe, 3: Anchor cover plate, 4: Prestressed tendon, 5: Hole, 6: Outer annular heat-conducting plate, 7: First fin heat sink, 8: Heating wire, 9: Second fin heat sink, 10: Annular base, 11: Temperature and humidity sensor, 12: Wiring hole, 13: Inner annular heat-conducting plate, 14: Heat-conducting connecting plate, 15: Sleeve, 16: First screw, 17: Second screw, 18: Arc-shaped pressure plate. Detailed Implementation

[0016] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0018] The following embodiments can be understood as explaining a part of the structure of the present invention individually, or as a combination of multiple embodiments used to illustrate a larger scope of the construction of the present invention.

[0019] Example 1: A prestressed duct temperature and humidity monitoring and heating device, such as Figure 1-3 As shown, the device includes a prestressing tendon 4 for passing through a prestressing duct 1. Multiple annular bases 10 are fixedly connected to the prestressing tendon 4. Temperature and humidity sensors 11 are embedded in the side surface of each annular base 10. An outer annular heat-conducting plate 6 is coaxially fixedly connected to the outer surface of each annular base 10. Heating wires 8 are connected between the outer annular heat-conducting plates 6 of adjacent annular bases 10. The heating wires 8 are electrically connected to a power source outside the prestressing duct 1 via wires. A control panel (not shown in the figure) for controlling the heating of the heating wires 8 is also provided on the wires. A display (not shown in the figure) is connected to the temperature and humidity sensors 11 via wires. The display is located outside the prestressing duct 1.

[0020] In this embodiment, a temperature and humidity sensor is used to detect the temperature and humidity information within the prestressed duct and display it on a monitor. Workers select an appropriate grouting time based on the temperature and humidity within the prestressed duct, or activate the heating wire to heat it to a suitable temperature before grouting. Within two days after grouting, the heating wire can be activated again to heat the filling block formed by the grout within the prestressed duct, even at low temperatures, thereby ensuring the quality of the prestressed duct grouting. After formation, apart from the wires, monitor, control panel, and power supply outside the prestressed duct, other components are pre-embedded as consumables within the component.

[0021] Example 2: like Figure 1-3 As shown, the annular base 10 is made of insulating material, and the outer annular heat-conducting plate 6 is made of metallic heat-conducting material. The axial width of the outer annular heat-conducting plate 6 is greater than the axial width of the annular base 10. The outer surface of the annular base 10 is tightly attached to and fixedly connected to the inner surface of the outer annular heat-conducting plate 6.

[0022] Example 3: like Figure 1 As shown, the heating wire 8 has a spiral structure (such as a spiral spring) and is sleeved on the outer periphery of the prestressed tendon 4. The two ends of the heating wire 8 are respectively connected to the corresponding outer annular heat-conducting plate 6. The outer surface of the outer annular heat-conducting plate 6 and the outer surface of the heating wire are both insulated. Multiple first fin heat sinks 7 are also evenly distributed on the outer periphery of the outer annular heat-conducting plate 6.

[0023] Example 4: like Figure 2 As shown, the first fin heat sink 7 has a plate-type structure.

[0024] Example 5: like Figure 3 As shown, the first fin heat sink 7 is a plate structure folded into an arc shape, which can increase the heat dissipation area.

[0025] Example 6: like Figure 1 As shown, the heating wire 8 is also evenly distributed with several second fin heat dissipation fins 9.

[0026] like Figure 1 As shown, the second fin heat sink 9 has a triangular plate-shaped structure.

[0027] Example 7: like Figure 2 , 3As shown, the inner surface of the annular base 10 is provided with an inner annular heat-conducting plate 13. The inner annular heat-conducting plate 13 is fixedly connected to the outer surface of the prestressing tendon 4 through a telescopic mechanism. The inner annular heat-conducting plate 13 and the outer annular heat-conducting plate 6 are connected on the same side edge through a heat-conducting connecting plate 14.

[0028] like Figure 2 , 3 As shown, the telescopic mechanism includes an arc-shaped pressure plate 18, a sleeve 15, a first screw 16, and a second screw 17 made of thermally conductive metal material. The first screw 16 and the second screw 17 are arranged opposite to each other along the radial direction of the inner annular heat-conducting plate 13. The inner wall of the sleeve 15 is provided with internal threads in opposite directions. The ends of the first screw 16 and the second screw 17 away from the sleeve 15 are respectively fixedly connected to the inner surface of the inner annular heat-conducting plate 13 and the middle of the outer surface of the arc-shaped pressure plate 18. The opposite ends of the first screw 16 and the second screw 17 are screwed to both ends of the sleeve 15. When the sleeve 15 is rotated, the first screw 16 and the second screw 17 move simultaneously away from or towards the sleeve 15. The arc-shaped pressure plate 18 is used in conjunction with the outer surface of the prestressing tendon 14. There are at least two telescopic mechanisms, and the two telescopic mechanisms are symmetrically arranged on both sides of the prestressing tendon 4.

[0029] In use, an appropriate number of annular bases are selected according to the length of the prestressing tendon. The annular bases and heating wires are sleeved on the outer circumference of the prestressing tendon. The annular bases are connected to the prestressing tendon through a telescopic mechanism. That is, by rotating the sleeve, the arc-shaped pressure plate is pressed tightly against the surface of the prestressing tendon, thus fixing the annular bases. The wires connecting the temperature and humidity sensor and the wires connecting the heating wires are passed through the pre-set wiring holes 12 on the annular bases. Then, the prestressing tendon is inserted into the prestressing duct. The wires pass through the holes 5 reserved in the anchoring cover plate 3. During the prestressing tensioning process, the heating wires will elongate to a certain extent. Due to their spiral structure, they can fully adapt to the tensioning elongation of the prestressing tendon. After tensioning, before grouting, the temperature and humidity in the prestressing duct 1 are detected in real time by the temperature and humidity sensor. Grouting is carried out at a time with suitable temperature and humidity, or the grouting is carried out after heating with the heating wires. Within two days after grouting, if the temperature is too low, the heating wires can be activated to heat the formed parts in the prestressing duct, thereby ensuring the effect of grouting and forming of the prestressing duct. Once the prestressed component in the prestressed duct reaches the preset strength, the wire can be cut.

Claims

1. A prestressed duct temperature and humidity monitoring and heating device, characterized in that: The device includes prestressing tendons that pass through prestressing ducts. Multiple annular bases are fixedly connected to the prestressing tendons. Temperature and humidity sensors are embedded on the side surfaces of the annular bases. An outer annular heat-conducting plate is coaxially fixedly connected to the outer surface of the annular base. Heating wires are connected between the outer annular heat-conducting plates of adjacent annular bases. The heating wires are electrically connected to a power source outside the prestressing ducts via wires. A control panel for controlling the heating of the heating wires is also provided on the wires. The temperature and humidity sensors are connected to a display via wires. The display is located outside the prestressing ducts.

2. The prestressed duct temperature and humidity monitoring and heating device as described in claim 1, characterized in that: The annular base is made of insulating material, and the outer annular heat-conducting plate is made of metallic heat-conducting material. The axial width of the outer annular heat-conducting plate is greater than the axial width of the annular base. The outer surface of the annular base is tightly attached to and fixedly connected to the inner surface of the outer annular heat-conducting plate.

3. The prestressed duct temperature and humidity monitoring and heating device as described in claim 2, characterized in that: The heating wire has a spiral structure and is sleeved on the outer periphery of the prestressed tendon. The two ends of the heating wire are respectively connected to the corresponding outer annular heat-conducting plate. The outer surface of the outer annular heat-conducting plate and the outer surface of the heating wire are both insulated. Multiple first fin heat dissipation fins are also evenly distributed on the outer periphery of the outer annular heat-conducting plate.

4. The prestressed duct temperature and humidity monitoring and heating device as described in claim 3, characterized in that: The first fin heat sink has a plate-type structure.

5. The prestressed duct temperature and humidity monitoring and heating device as described in claim 4, characterized in that: The first fin heat sink is a plate structure folded into an arc shape.

6. The prestressed duct temperature and humidity monitoring and heating device as described in claim 5, characterized in that: The heating wire is also evenly distributed with several second fin heat dissipation plates.

7. The prestressed duct temperature and humidity monitoring and heating device as described in claim 6, characterized in that: The second fin heat sink has a triangular plate-shaped structure.

8. The prestressed duct temperature and humidity monitoring and heating device as described in claim 7, characterized in that: The inner surface of the annular base is provided with an inner annular heat-conducting plate. The inner annular heat-conducting plate is fixedly connected to the outer surface of the prestressing tendon through a telescopic mechanism. The inner annular heat-conducting plate and the outer annular heat-conducting plate are connected on the same side edge through a heat-conducting connecting plate.

9. The prestressed duct temperature and humidity monitoring and heating device as described in claim 8, characterized in that: The telescopic mechanism includes an arc-shaped pressure plate, a sleeve, a first screw, and a second screw, all made of thermally conductive metal. The first and second screws are arranged opposite each other along the radial direction of the inner annular heat-conducting plate. The inner wall of the sleeve has internal threads with opposite directions of rotation. The ends of the first and second screws away from the sleeve are fixedly connected to the inner surface of the inner annular heat-conducting plate and the middle of the outer surface of the arc-shaped pressure plate, respectively. The opposite ends of the first and second screws are screwed to both ends of the sleeve. When the sleeve is rotated, the first and second screws move simultaneously away from or towards the sleeve. The arc-shaped pressure plate cooperates with the outer surface of the prestressing tendon. There are at least two telescopic mechanisms, symmetrically arranged on both sides of the prestressing tendon.

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