阅读说明：本技术 混凝土测温的方法 (Concrete temperature measuring method ) 是由 李庆伟 何本其 罗朝贵 尹光雪 于 2021-01-07 设计创作，主要内容包括：本发明公开了一种混凝土测温的方法,包括：采用建筑电子测温仪配合预埋测温元件进行测温；所述预埋测温元件的监测点的布置范围以所选混凝土浇筑体平面图对称轴线的半条轴线为测试区,在测试区内监测点按平面分层布置；在测试区内,监测点的位置与数量根据温凝土浇筑体内温度场和温控的要求确定；混凝土浇筑体的外表温度,以混凝土外表以内50mm处的温度为准；混凝土浇筑体底面的温度,以混凝土浇筑体底面上50mm处的温度为准。通过本发明可了解基础大体积混凝土内部由于水化热引起的温度升降规律,掌握基础混凝土中心与表面、表面与大气温度间的温度变化情况,以便采取防止混凝土裂痕的相关措施。(The invention discloses a concrete temperature measurement method, which comprises the following steps: measuring the temperature by adopting a building electronic temperature measuring instrument and matching with a pre-embedded temperature measuring element; the arrangement range of the monitoring points of the embedded temperature measuring elements takes a half axis of the symmetry axis of a plane diagram of the selected concrete casting as a test area, and the monitoring points are arranged in layers according to the plane in the test area; in the test area, the positions and the number of the monitoring points are determined according to the temperature field in the warm concrete pouring body and the requirements of temperature control; the surface temperature of the concrete casting body is based on the temperature at the position 50mm inside the surface of the concrete; the temperature of the bottom surface of the concrete casting body is based on the temperature of the position 50mm above the bottom surface of the concrete casting body. The method can know the temperature rising and falling rule caused by hydration heat in the large-volume concrete of the foundation, and master the temperature change condition between the center and the surface of the foundation concrete and between the surface and the atmospheric temperature so as to take the relevant measures for preventing the concrete cracks.)

1. A method for measuring the temperature of concrete is characterized by comprising the following steps:

measuring the temperature by adopting a building electronic temperature measuring instrument and matching with a pre-embedded temperature measuring element;

the arrangement range of the monitoring points of the embedded temperature measuring elements takes a half axis of the symmetry axis of a plane diagram of the selected concrete casting as a test area, and the monitoring points are arranged in layers according to the plane in the test area;

in the test area, the positions and the number of the monitoring points are determined according to the temperature field in the warm concrete pouring body and the requirements of temperature control;

the surface temperature of the concrete casting body is based on the temperature at the position 50mm inside the surface of the concrete;

the temperature of the bottom surface of the concrete casting body is based on the temperature of the position 50mm above the bottom surface of the concrete casting body.

2. The method according to claim 1, wherein the building electronic thermometer is a JDC-2 thermometer.

3. The method for measuring the temperature of concrete according to claim 1, wherein the monitoring points are not less than 4 points on the symmetry axis of the base plane.

4. The method for measuring the temperature of the concrete as claimed in claim 1, wherein the number of the measuring points at each point is not less than 2 points along the thickness direction of the concrete casting.

5. The method for measuring the temperature of concrete according to claim 1, wherein a thermometer is arranged on the surface of the concrete at a height of 1.5 m to measure the atmospheric temperature.

6. The method of claim 1, wherein the temperature of the concrete entering the mold is measured at each concrete pump opening by a probe made of a temperature probe and a temperature measuring line fixed on a wooden stick.

7. The method for measuring the temperature of the concrete according to claim 1, wherein the temperature measuring error of the temperature measuring element is not more than 0.3 ℃, the test range is-30-150 ℃, and the insulation resistance is more than 500M Ω.

8. The method for measuring the temperature of the concrete according to claim 1, wherein the embedding method of the temperature measuring element comprises the following steps: the steel bar is used as a vertical support, the temperature measuring line and the temperature measuring probe are fixed on the steel bar by using an adhesive tape, the temperature measuring probe is wrapped by plastic cloth, and a 30mm small batten is bound on the steel bar to be isolated from the temperature measuring probe and fixed by using the adhesive tape; and a plug at the other end of the temperature measuring line is labeled according to the serial number, and the temperature measuring plug is wrapped by a plastic film before concrete pouring.

9. The method of claim 1, wherein the temperature sensing element passes the test of 24 hours submerged at 1m of water before installation without damage.

Technical Field

The invention relates to the technical field of buildings, in particular to a concrete temperature measurement method.

Background

The inside heat of concrete is difficult giving off during the construction, and outside surface heat gives off very fast, and inside and outside expend with heat and contract with cold the corresponding tensile stress that can produce on the concrete surface of process. When the temperature difference is large to a certain degree, and the tensile stress of the concrete surface exceeds the ultimate tensile strength of the concrete at that time, harmful cracks can be generated on the concrete surface, and sometimes even the cracks penetrate through the concrete surface. In addition, the concrete shrinks with a decrease in temperature after hardening, and is restrained by the foundation, thereby generating a large external restraining force, and when the ultimate tensile strength of the concrete exceeds the ultimate tensile strength, cracks are generated. In order to know the temperature rising and falling rule caused by hydration heat in the large-volume foundation concrete, the temperature change conditions between the center and the surface of the foundation concrete and between the surface and the atmospheric temperature are mastered so as to take necessary measures.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a concrete temperature measuring method and aims to master the temperature change condition between the center and the surface of the basic concrete and between the surface and the atmospheric temperature.

In view of the above problems of the prior art, according to one aspect of the present disclosure, the following technical solutions are adopted in the present invention:

a method of concrete thermometry comprising:

measuring the temperature by adopting a building electronic temperature measuring instrument and matching with a pre-embedded temperature measuring element;

the arrangement range of the monitoring points of the embedded temperature measuring elements takes a half axis of the symmetry axis of a plane diagram of the selected concrete casting as a test area, and the monitoring points are arranged in layers according to the plane in the test area;

in the test area, the positions and the number of the monitoring points are determined according to the temperature field in the warm concrete pouring body and the requirements of temperature control;

the surface temperature of the concrete casting body is based on the temperature at the position 50mm inside the surface of the concrete;

the temperature of the bottom surface of the concrete casting body is based on the temperature of the position 50mm above the bottom surface of the concrete casting body.

In order to better realize the invention, the further technical scheme is as follows:

according to one embodiment of the invention, the building electronic thermometer is a JDC-2 thermometer.

According to another embodiment of the present invention, on the symmetry axis of the base plane, the monitoring points are not less than 4 points.

According to another embodiment of the invention, the number of the measuring points of each point position along the thickness direction of the concrete pouring body is not less than 2.

According to another embodiment of the invention, a thermometer is placed at 1.5 meters height above the concrete surface to measure the atmospheric temperature.

According to another embodiment of the invention, the mold-entering temperature of the concrete is measured at each concrete pump opening by a probe made of a temperature measuring probe and a temperature measuring line fixed on a wooden stick.

According to another embodiment of the invention, the temperature measurement error of the temperature measurement element is not more than 0.3 ℃, the test range is-30-150 ℃, and the insulation resistance is more than 500M omega.

According to another embodiment of the invention, the embedding method of the temperature measuring element comprises the following steps: the steel bar is used as a vertical support, the temperature measuring line and the temperature measuring probe are fixed on the steel bar by using an adhesive tape, the temperature measuring probe is wrapped by plastic cloth, and a 30mm small batten is bound on the steel bar to be isolated from the temperature measuring probe and fixed by using the adhesive tape; and a plug at the other end of the temperature measuring line is labeled according to the serial number, and the temperature measuring plug is wrapped by a plastic film before concrete pouring.

According to another embodiment of the present invention, the temperature measuring element passes the test of being not damaged by being soaked for 24 hours at 1m under water before being installed.

Compared with the prior art, the invention has the following beneficial effects:

through the concrete temperature measuring method, the temperature rising and falling rule caused by hydration heat in the large-volume concrete of the foundation can be known, and the temperature change conditions between the center and the surface of the foundation concrete and between the surface and the atmospheric temperature can be mastered so as to take relevant measures for preventing concrete cracks.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

And a building electronic temperature measuring instrument (JDC-2) is matched with the embedded temperature measuring wires for measuring the temperature.

The principle of temperature measuring point arrangement is as follows: the arrangement range of the monitoring points takes a half axis of the symmetry axis of the plane drawing of the selected concrete casting as a test area, and the monitoring points are arranged in layers according to the plane in the test area.

In the test area, the positions and the number of the monitoring points can be determined according to the requirements of a temperature field and temperature control in the warm concrete pouring body, and the measuring points can be arranged along the most unfavorable positions by basically determining the rule of the temperature field through theoretical calculation.

On the symmetry axis of the basic plane, the monitoring point position is preferably not less than 4, and the geometric dimension of the structure is fully considered during arrangement.

Along the thickness direction of the concrete casting, the number of the measuring points of each point position is preferably not less than 2.

The heat preservation maintenance effect and the number of the environmental temperature monitoring points are determined according to specific requirements.

The surface temperature of the concrete casting body is subject to the temperature at the position 50mm inside the surface of the concrete.

The temperature of the bottom surface of the concrete casting body is subject to the temperature of 50mm above the bottom surface of the concrete casting body. Common thermometers are respectively arranged on the concrete surface of the temperature measuring bearing platform of the gymnasium and the comprehensive training center at the height of 1.5 m for measuring the atmospheric temperature. And a temperature measuring probe and a temperature measuring line are fixed on a wood stick at each concrete pump opening to form a probe rod for measuring the mold entering temperature of the concrete. The arrangement of the temperature measuring points is representative, the temperature of each part in the mass concrete can be comprehensively reflected, the mass concrete comprises a bottom surface, a center and an upper surface from the view of a high section of the mass concrete, and the mass concrete comprises a middle part and a corner area from the view of a plane.

The arrangement of the temperature measuring points in the horizontal direction is determined according to the characteristics of the components, and the temperature measuring points are not too close to each other or too far away from each other. The distance between the temperature measuring points is 600 mm. An upper point, a middle point and a lower point are buried in each temperature measuring point along the vertical direction of the thickness of the bearing platform, the bottom of the bearing platform of the lower point is 50mm, the middle point is the middle of the thickness of the bearing platform, and the top of the bearing platform of the upper point is 50mm below.

Selection and use of the temperature measuring element are specified as follows: the temperature measurement error of the temperature measurement element is not more than 0.3 ℃; test range: -30 to 150 ℃. The insulation resistance is greater than 500M omega. The method for mounting the temperature measuring element comprises the following steps: and pre-burying a temperature measuring line and a temperature measuring probe on a selected temperature measuring point before pouring the concrete. The pre-embedding method comprises the following steps: the vertical support is made of 1 steel bar with 12 steel bars, the temperature measuring line and the temperature measuring probe are fixed on the steel bars through adhesive tapes, the temperature measuring probe is wrapped by plastic cloth, and a 30mm small batten is bound on the steel bars to be isolated from the temperature measuring probe and fixed through the adhesive tapes. The other end plug of the temperature measuring line is labeled according to the serial number, and the temperature measuring plug is wrapped by a plastic film before concrete pouring, so that pollution or damage is avoided. The temperature measuring line is at least 1 meter higher than the surface of the concrete.

Preferred embodiments of the temperature sensing element: before the temperature measuring element is installed, the temperature measuring element can be soaked for 24 hours at a position 1m under water without being damaged. The temperature measuring element joint is accurate in installation position, firm in fixation and heat-insulated with the structural steel bars and the metal body of the fixing frame. The leading-out wires of the temperature measuring elements are preferably arranged in a centralized manner and protected. The periphery of the temperature measuring element is protected, and the temperature measuring element and a leading-out wire thereof cannot be directly impacted and tested during blanking in the concrete pouring process; when vibrating, the vibrator does not touch the temperature measuring element and the leading-out wire.

In summary, by the concrete temperature measuring method, the temperature rising and falling rule caused by hydration heat in the large-volume concrete of the foundation can be known, and the temperature change conditions between the center and the surface of the foundation concrete and between the surface and the atmospheric temperature can be mastered so as to take measures related to preventing concrete cracks.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.