CN114383745B - Method and device for fixing thermocouple inside outer steel plate concrete combined member - Google Patents
Method and device for fixing thermocouple inside outer steel plate concrete combined member Download PDFInfo
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- CN114383745B CN114383745B CN202111661718.1A CN202111661718A CN114383745B CN 114383745 B CN114383745 B CN 114383745B CN 202111661718 A CN202111661718 A CN 202111661718A CN 114383745 B CN114383745 B CN 114383745B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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Abstract
The invention relates to a method and a device for fixing a thermocouple in an outer steel plate concrete combined member, wherein the method comprises the following steps: determining the drilling position and diameter of the member outer-coated steel plate according to the temperature field measurement position and the number of thermocouples; measuring the distance from the measuring point to the outer surface of the drilling steel plate on the thermocouple, marking, arranging the thermocouple into an approximate circle, and binding the thermocouple with an iron wire at a non-stretching section; drilling a through round hole at the position of the steel plate of the component, and welding the fixed support on the component; firstly, pouring concrete to the lowest point of the round hole, extending the thermocouple into the marked position from the round hole and fixing the thermocouple on the bracket, and manually pouring the concrete to enable the concrete to cover the thermocouple; and finally, pouring upper concrete and vibrating to compact. The method can accurately position and fix the thermocouple inside the combined member, thereby measuring the internal concrete temperature field, and has small damage to the member and the thermocouple, simple method and easy operation.
Description
Technical Field
The invention relates to the technical field of building disaster prevention and reduction, in particular to a method and a device for fixing a thermocouple in an outer steel plate concrete combined member.
Background
The outer steel plate concrete composite structure is a composite structure of a common working system formed by an outer steel plate and inner filling concrete through connecting pieces such as studs. The common vertical combined member in the actual engineering has an outer steel plate rectangular concrete column, a circular steel tube concrete column, an outer steel plate concrete special-shaped column, an outer steel plate concrete combined shear wall and the like. The combined structure integrates good compression performance of concrete and excellent tensile performance of a steel plate on the aspect of mechanical properties, has high bearing capacity, excellent shock resistance and good shock resistance, can be constructed by adopting modular assembly, has outstanding advantages in the aspects of accelerating construction progress, integrating economic benefits and the like, and can realize the construction targets of high efficiency, order and environmental protection. The steel plate-wrapped concrete composite structure is more and more widely applied to the fields of high-rise and super high-rise buildings, bridges, nuclear power plants and the like. Because the strength of steel and concrete is reduced to different degrees at high temperature (after) of fire, and even the steel and concrete may lose their bearing capacity completely after the action of high temperature for a certain period of time, the research on fire behavior and fire resistance of steel plate and concrete clad composite members is the key to ensure their safe use. In the fire resistance experiment of the steel plate concrete composite structure, the real-time measurement of the concrete temperature field inside the composite member is a very important test content. In experiments, a plurality of thermocouples are arranged in the thickness direction at a specific section selected in a combined member to measure the internal concrete temperature field (CN 2020206260751).
At present, in the fire resistance test of the outer-wrapping steel plate concrete composite structure, a unified method for embedding and fixing thermocouples is not provided, and relevant specifications are not provided. In the study on the normal temperature and the stress performance after fire of the double-steel-plate concrete combined shear wall stud connector, the double-steel-plate concrete combined shear wall stud connector after fire pushes out a test piece manufacturing part of the experimental study, thin steel bars are welded between steel plates, a thermocouple is welded and fixed on an additional steel bar, and a vibrating rod is prevented from disturbing the position of the thermocouple during pouring. However, the existing method for fixing the thermocouple has the following defects: (1) the thermocouple is damaged when the welding temperature is too high, so that the measurement precision is reduced; (2) the thermocouple is easy to be disturbed and deviated in the construction process, and the accuracy of the measuring point position cannot be ensured; (3) the thermocouple is vulnerable to impact and damage during concrete casting.
Disclosure of Invention
Aiming at the defects of the experimental technology, the invention mainly aims to provide a method and a device for fixing a thermocouple in an outer steel plate concrete combined member, aiming at reducing the disturbance of the construction process to the thermocouple and ensuring the accuracy of the position of a temperature measuring point; and the damage of construction factors to the thermocouple is avoided, so that the real-time measurement of the concrete temperature field in the steel plate concrete composite structure is better realized.
The invention is realized by at least one of the following technical schemes.
The method for fixing the thermocouple inside the steel plate concrete outer-wrapping combined member comprises the following steps of:
determining the drilling position of the outer steel plate of the experimental component according to the temperature field measurement position and drilling; determining the positions and the number of measuring points of the thermocouples along the thickness direction according to the measurement requirement;
arranging thermocouples in sequence and binding the thermocouples into thermocouple bundles, measuring the distance from a measuring point to the outer surface of the drilling steel plate on the thermocouples and marking the thermocouples;
welding a fixing bracket on the outer surface of the experimental member for fixing the thermocouple bundle;
firstly, pouring concrete into the experimental member, vibrating the concrete tightly, and enabling the upper surface of the concrete to be level with the lowest point of a drilled hole;
extending a thermocouple bundle from the drill hole and stopping at the mark, welding the part of the thermocouple bundle which does not extend on the fixed support, and sealing gaps among the thermocouples and a steel plate at the drill hole position by drip irrigation glue;
then pouring concrete again to enable the concrete to completely cover the thermocouple bundle;
and finally, pouring concrete from the upper part of the concrete, vibrating the concrete compactly to finish the pouring of the concrete inside the combined member, and cutting off the fixed support after the concrete is cured.
Preferably, the thermocouples in the thermocouple bundle in each borehole are arranged by serial numbers, and the arrangement shape is approximate to a circle.
Preferably, the drill holes are penetrating round holes, the diameter of each round hole is determined according to the number and arrangement mode of the thermocouples, and the diameter of each round hole is 1-2mm larger than the outer diameter of the thermocouple bundle.
Preferably, concrete is poured for the first time to the lowest point of the drill hole, the thermocouple bundle extends into the drill hole and stops at the mark, and the part, which does not extend into the thermocouple bundle, is fixed on the horizontal steel plate through the iron wire.
Preferably, glue is dripped at the position of the circular hole to block gaps among the thermocouples and holes between the thermocouples and the experimental member, and then concrete is poured manually to enable the concrete to completely cover the thermocouple bundle.
Preferably, the distance from the measuring point position to the surface of the experimental component of the drill hole is measured and marked on the thermocouple in advance, the thermocouple is tightly bound by using an iron wire at the non-stretching section, and the thermocouple mark number and the distance from the measuring point corresponding to the thermocouple mark number to the inner surface of the experimental component of the drill hole are recorded in a table.
Preferably, the marks on the thermocouples are flush with the outer surface of the experimental member drilled with a hole, and the number of the bound iron wires and the distance between the iron wires are set according to the number of the thermocouples of the thermocouple bundle in the non-stretching-in section of the thermocouple bundle.
The device for realizing the method for fixing the thermocouple in the externally-coated steel plate concrete combined member comprises a thermocouple fixing support, wherein the fixing support comprises a horizontal steel plate and a plurality of steel bar inclined struts; the horizontal steel plate is installed on the surface of an experimental component through a plurality of steel bar inclined struts, the experimental component comprises an outer-coated steel plate and internally filled concrete, a vertical combined component is formed jointly, and the vertical combined component bears vertical load and bending moment simultaneously.
Preferably, the upper surface of the horizontal steel plate is tangent to the lowest point of the circular hole in the vertical combined member, one end of the horizontal steel plate is connected to the outer surface of the vertical combined member, and the other end of the horizontal steel plate is supported on the plurality of steel bar inclined struts.
Preferably, two ends of the steel bar inclined strut are respectively connected to the lower surface of the horizontal steel plate and the surface of the vertical combined component.
Compared with the prior art, the invention has the beneficial effects that:
according to the method and the device for fixing the thermocouple in the externally-coated steel plate concrete combined member, the thermocouple can be prevented from being disturbed in the construction process by the additional fixing support, and the accurate positioning of the temperature measuring point is ensured; the construction sequence is optimized, and the thermocouple is prevented from being damaged due to impact in the concrete pouring process; the size of the drilled hole is small, the damage to the experimental component is small, and the positions of the drilled hole and the positions of the measuring points along the thickness direction are basically not limited. The method can improve the fire resistance experiment quality of the steel plate concrete outer-wrapping combined member, is simple, is easy to operate, and is worthy of popularization.
Drawings
FIG. 1 is a schematic view of a fixing device for a thermocouple inside an outer clad steel plate concrete combined member;
FIG. 2 is a schematic view of a stationary support;
FIG. 3a is a schematic view of an arrangement of thermocouples and a thermocouple bundle of example 1;
FIG. 3b is a schematic view of thermocouple labeling;
FIG. 4 is a schematic view of a thermocouple installation and a concrete placement sequence;
FIG. 5 is a schematic view showing an arrangement of thermocouples in example 2;
FIG. 6 is a schematic view showing an arrangement of thermocouples in example 3;
FIG. 7 is a schematic view of a thermocouple;
the method comprises the following steps of 1-thermocouple bundle, 2-binding iron wires, 3-penetrating round holes, 4-horizontal steel plates of a fixed support, 5-inclined struts of the fixed support, 6-externally-wrapped steel plates, 7-first-poured concrete, 8-second-manually-poured concrete and 9-third-poured concrete.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific examples, wherein the positional relationships indicated by the terms "upper", "lower", "left", "right", etc., are merely illustrative based on the positional relationships shown in the drawings for the purpose of facilitating the description of the present invention and simplifying the description, but do not imply that the apparatus must have a specific orientation configuration and operation, and therefore the description of the positional relationships should not be construed as limiting the present invention; also, general techniques and descriptions used in the present invention should be considered to have the same meaning as understood by those skilled in the art to which the present invention pertains.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the disclosure.
The fixing device for the thermocouple inside the steel plate concrete combined member wrapped outside as shown in fig. 1 and fig. 2 comprises a thermocouple fixing support, wherein the fixing support comprises a horizontal steel plate 4 and a plurality of steel bar inclined struts 5; horizontal steel plate 4 installs on the experiment component surface through a plurality of reinforcing bar bracing 5, the experiment component includes outsourcing steel sheet and the concrete of inside packing, constitutes vertical combined member jointly, vertical combined member bears vertical load and moment of flexure simultaneously.
The cross section of the vertical combined component is circular, rectangular, T-shaped, L-shaped, I-shaped or cross-shaped.
The predetermined drilling position of experiment component outsourcing steel sheet bores round hole 3, 4 upper surfaces of horizontal steel sheet with the minimum of round hole 3 is tangent, 4 one ends of horizontal steel sheet weld in the combined member surface, and the other end supports on two reinforcing bar bracing 5, 5 both ends of reinforcing bar bracing weld respectively in the lower surface of horizontal steel sheet 4 and vertical combined member surface.
The invention also provides a method for fixing the thermocouple in the outer steel plate concrete combined member, which comprises the following steps:
1) Determining the drilling position of the steel plate wrapped outside the combined member (experimental member) according to the temperature field measurement position, drilling, and determining the positions and the number of thermocouple measuring points in the thickness direction according to the measurement requirement;
2) The thermocouples are arranged in a certain sequence and are bound by iron wires 2 to form thermocouple bundles, the distance from the corresponding measuring point position to the outer surface of the steel plate is measured on the thermocouples and marked, then the marks of all the thermocouples are aligned and arranged from left to right and from top to bottom to form the thermocouple bundles with the shape close to a circle; the size of the drill hole is determined according to the number and arrangement mode of the thermocouples, and the diameter of the drill hole is slightly larger than the outer diameter of the thermocouple bundle by 1-2mm;
3) Welding the fixed bracket on the surface of the steel plate;
4) Pouring concrete 7 below the circular hole for the first time, vibrating the concrete tightly, and enabling the upper surface of the concrete 7 to be flush with the lowest point of the circular hole; extending the thermocouple bundle into the mark from the round hole, and welding the part of the thermocouple bundle which does not extend into the mark on the steel plate of the fixed support through binding iron wires of the thermocouple bundle; dripping 502 glue water at the drilling position to block gaps between thermocouples and pores between the thermocouples and the steel plate;
5) Then, continuously pouring concrete 8 manually and vibrating to be compact, wherein the position of the thermocouple bundle needs to be avoided during vibration, and the concrete completely covers the thermocouple bundle;
6) And finally, pouring the residual upper concrete 9, vibrating the residual upper concrete compactly to finish the pouring of the concrete in the experimental component, carefully cutting off the fixed support after the concrete curing is finished, and avoiding damaging the outer steel plate of the experimental component during cutting off.
As shown in fig. 3a and 3b, determining the positions and the number of thermocouple measuring points along the thickness direction of the vertical combined member, recording thermocouple numbers and the distances from the positions of the thermocouple measuring points to the outer surface of the combined member in a table (as shown in table 1), measuring the distances from the positions of the corresponding measuring points to the outer surface of the combined member on the thermocouples and marking, aligning the marks of all the thermocouples, and arranging the thermocouples from left to right and from top to bottom to form a thermocouple bundle with a shape close to a circle; the diameter of the round hole 3 is slightly larger than the outer diameter of the thermocouple bundle 1 by 1-2mm; the non-stretching section of the thermocouple bundle is tightly bound by iron wires 2 at certain intervals.
TABLE 1 thermocouple recorder
As shown in fig. 4, the experimental operation sequence is: pouring concrete 7 below the circular hole 3 for the first time, and closely vibrating to enable the upper surface of the concrete to be flush with the lowest point of the circular hole 3; then, the bound thermocouple bundle 1 extends into a round hole 3 and stops at the mark, the non-extending section of the thermocouple bundle 1 is welded on the fixed support through an iron wire 2, and glue is dripped 502 at the position of the drill hole 3 to block gaps among thermocouples and holes among the thermocouples and the round hole; then, manually pouring concrete 8 to enable the concrete to completely cover the thermocouple bundle 1; pouring upper concrete 9 for the third time and vibrating to compact; after concrete curing is finished, the fixing support is carefully cut off, and the experimental component is prevented from being damaged during cutting. It should be noted that the concrete 8 is poured manually to avoid the thermocouple from being damaged by the impact of the concrete mixture during the construction process, and the position of the thermocouple bundle should be avoided during vibration; at the non-stretching-in section of thermocouple bundle 1, can increase the quantity of ligature iron wire according to actual conditions. Measuring the concrete temperature field inside the steel plate concrete composite member wrapped outside; and marking the thermocouples according to the distance from the thermocouple measuring points to the outer surface of the drilling steel plate, wherein the thermocouples are arranged by sequence numbers, and the arrangement shape is approximate to a circle.
As shown in FIG. 7, the temperature measured by the thermocouple in the experiment is the temperature of the concrete between the inner surface of the steel plate with the drilled hole and the inner surface of the steel plate on the other side. The thermocouple is a commonly used temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument. The thermocouple generally comprises main parts such as a thermode probe, an insulating sleeve protection tube, a junction box and the like, and is generally matched with a display instrument, a recording instrument and an electronic regulator for use. The thermocouple used in the present invention is shown in fig. 7, and its probe portion is inserted into the inside of the composite structure through the circular hole 3 for measuring the temperature inside the concrete. The diameter of the thermocouple probe is small, so that the diameter of a drill hole required after binding the thermocouple is small, the damage to an experimental member is small, and too large operation space is not required, so that the positions of the drill hole and the positions of measuring points along the thickness direction are basically not limited.
Example 1
The cross section of the vertical combined component adopted in the embodiment is rectangular, the drilling position of the outer-coated steel plate of the experimental component is determined according to the temperature field measurement position, holes are drilled, and the positions and the number of thermocouple measurement points in the thickness direction are determined according to the measurement requirement;
arranging and binding thermocouples into thermocouple bundles, wherein the cross sections of the thermocouple bundles are shown in FIG. 3a, and measuring and marking the distances from the measuring points to the outer surface of the drilling steel plate on the thermocouples;
welding the fixed bracket on the outer surface of the experimental component;
firstly, pouring concrete under a drilled hole, closely vibrating and compacting, and enabling the upper surface of the concrete to be flush with the lowest point of the drilled hole;
extending a thermocouple bundle from the drill hole and stopping at the marked position, welding the part of the thermocouple bundle which does not extend into the fixed support, and dripping glue at the drill hole position to block gaps among the thermocouples and gaps between the thermocouples and the steel plate; then, manually pouring concrete to enable the concrete to completely cover the thermocouple bundle;
and finally, pouring upper concrete and vibrating tightly to finish the pouring of the internal concrete of the combined member, and cutting off the fixed support after the concrete is cured.
Example 2
The cross section of the vertical combined component adopted in the embodiment is circular, the drilling position of the outer-coated steel plate of the experimental component is determined according to the temperature field measurement position, holes are drilled, and the positions and the number of thermocouple measuring points in the thickness direction are determined according to the measurement requirement;
arranging and binding thermocouples into thermocouple bundles, wherein the cross sections of the thermocouple bundles are shown in FIG. 5, and marking positions on the thermocouple bundles corresponding to the outer surfaces of the drilled experimental components;
welding the fixed bracket on the outer surface of the experimental component;
firstly, pouring concrete under a drilled hole, closely vibrating and compacting, and enabling the upper surface of the concrete to be flush with the lowest point of the drilled hole;
extending a thermocouple bundle from the drill hole and stopping at the mark, welding the part of the thermocouple bundle which does not extend on the fixed support, and sealing gaps among the thermocouples and a steel plate at the drill hole position by drip irrigation glue; then, manually pouring concrete with the thickness of 10cm to ensure that the concrete completely covers the thermocouple bundle;
and finally, pouring upper concrete and vibrating tightly to finish the pouring of the internal concrete of the combined member, and cutting off the fixed support after the concrete is cured.
Example 3
The cross section of the vertical combined component adopted in the embodiment is I-shaped, the drilling position of the outer steel plate of the experimental component is determined according to the temperature field measurement position, holes are drilled, and the positions and the number of thermocouple measurement points in the thickness direction are determined according to the measurement requirement;
arranging and binding thermocouples into thermocouple bundles, wherein the cross sections of the thermocouple bundles are shown in FIG. 6, and measuring and marking the distances from the measuring points to the outer surface of the drilling steel plate on the thermocouples;
welding the fixed bracket on the outer surface of the experimental component;
firstly, pouring concrete under a drilled hole, closely vibrating and compacting, and enabling the upper surface of the concrete to be flush with the lowest point of the drilled hole;
extending a thermocouple bundle from the drill hole and stopping at the mark, welding the part of the thermocouple bundle which does not extend on the fixed support, and sealing gaps among the thermocouples and a steel plate at the drill hole position by drip irrigation glue; then, manually pouring concrete to enable the concrete to completely cover the thermocouple bundle;
and finally, pouring upper concrete and vibrating the upper concrete tightly to finish the pouring of the internal concrete of the combined member, and cutting off the fixed support after the concrete is cured.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the technical solutions should be covered by the claims of the present invention.
Claims (10)
1. The method for fixing the thermocouple inside the steel plate concrete composite member is characterized by comprising the following steps of:
determining the drilling position of the steel plate wrapped outside the experimental component according to the temperature field measurement position and drilling; determining the positions and the number of measuring points of the thermocouples along the thickness direction according to the measurement requirement;
arranging thermocouples in sequence and binding the thermocouples into thermocouple bundles, measuring the distance from a measuring point to the outer surface of the drilling steel plate on the thermocouples and marking the thermocouples;
welding a fixing bracket on the outer surface of the experimental member for fixing the thermocouple bundle;
firstly, pouring concrete (7) into the experimental member, vibrating the experimental member to be compact, and enabling the upper surface of the concrete to be flush with the lowest point of a drilled hole;
extending a thermocouple bundle from the drill hole and stopping at the marked position, welding the part of the thermocouple bundle which does not extend into the fixed support, and dripping glue at the drill hole position to block gaps among the thermocouples and gaps between the thermocouples and the steel plate;
then pouring concrete (8) again to enable the concrete (8) to completely cover the thermocouple bundle;
and finally, pouring concrete (9) from the upper part of the concrete (8) and vibrating tightly to finish the pouring of the concrete inside the combined member, and cutting off the fixed support after the concrete is cured.
2. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 1, wherein: the thermocouples in the thermocouple bundle in each drill hole are arranged in sequence, and the arrangement shape is approximate to a circle.
3. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 1, wherein: the drill holes are through round holes, the diameter of each round hole is determined according to the number and arrangement mode of the thermocouples, and the diameter of each round hole is 1-2mm larger than the outer diameter of the thermocouple bundle.
4. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 1, wherein: and pouring concrete for the first time to the lowest point of the drill hole, extending the thermocouple bundle from the drill hole to the mark position, and fixing the part, which does not extend into the thermocouple bundle, on the horizontal steel plate (4) through an iron wire.
5. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 1, wherein: and (3) dripping glue at the position of the circular hole to plug gaps between the thermocouples and holes between the thermocouples and the experimental member, and then manually pouring concrete to enable the concrete to completely cover the thermocouple bundles.
6. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 1, wherein: the distance from the measuring point position to the surface of the experimental component of the drill hole is measured on the thermocouple and marked, the thermocouple is tightly bound by using an iron wire at the non-stretching section, and the thermocouple mark number and the distance from the measuring point corresponding to the thermocouple mark number to the inner surface of the experimental component of the drill hole are recorded in a table.
7. The method of securing a thermocouple within an encased steel panel concrete composite member as claimed in any one of claims 1~6 wherein: the marks on the thermocouples are flush with the outer surface of the experimental member drilled with the hole, and the number of the bound iron wires and the distance between the iron wires are set at the non-stretching-in section of the thermocouple bundle according to the number of the thermocouples of the thermocouple bundle.
8. The method for fixing a thermocouple inside a clad steel plate concrete composite member according to claim 1, wherein the fixing bracket comprises a horizontal steel plate (4) and a plurality of steel bar diagonal braces (5); horizontal steel sheet (4) are installed on the experiment component surface through a plurality of reinforcing bar bracing (5), the experiment component includes outsourcing steel sheet and the inside concrete of filling, constitutes vertical combined member jointly, vertical combined member bears vertical load and moment of flexure simultaneously.
9. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 8, wherein: the upper surface of the horizontal steel plate (4) is tangent to the lowest point of the round hole (3) on the vertical combined component, one end of the horizontal steel plate is connected to the outer surface of the vertical combined component, and the other end of the horizontal steel plate is supported on the plurality of steel bar inclined struts (5).
10. The method for fixing a thermocouple inside an externally-coated steel plate concrete composite member according to claim 8, wherein: and two ends of the steel bar inclined strut (5) are respectively connected to the lower surface of the horizontal steel plate (4) and the surface of the vertical combined component.
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