A measuring tool and method for detecting weight deviation of steel bar quality

Abstract

The application provides a measuring tool and method for measuring weight deviation of steel bar quality detection, a water level scale is arranged on one side of a test barrel in a vertical direction, and the water level scale and the lower part of the test barrel are communicated to form a communicating vessel, a sample is placed in the test barrel, and end head sealing sleeves are used for sleeving two ends of the sample and avoiding liquid from entering the end head sealing sleeves of the two ends of the sample. The problems that the end head of the steel bar cut by the existing method is uneven, the cutting surface is irregular, the length measurement cannot be accurately measured, and secondary processing needs to be performed by using a grinding machine or a grinding machine, which is time-consuming and laborious, are solved. The application belongs to the technical field of steel bar detection.

Description

Technical Field

[0001] This invention belongs to the field of rebar testing technology, specifically relating to a measuring tool and method for measuring the weight deviation of rebar quality testing. Background Technology

[0002] After steel bars used in construction projects arrive at the construction site, samples must be taken on-site and tested by a testing agency according to the requirements of GB / T1499.1-2017 "Steel for Reinforced Concrete - Part 1: Hot-rolled Plain Round Steel Bars" and GB / T1499.2-2018 "Steel for Reinforced Concrete - Part 2: Hot-rolled Ribbed Steel Bars". Only those samples that pass the tests can be used. Among these tests, weight deviation is one of the important items. The specifications require that samples be cut from different steel bars, with a minimum of 5 samples, each sample being at least 500mm long. The length of each sample should be measured individually and accurately to 1mm. Due to the limitations of construction site conditions, most construction sites use steel bar cutting machines to cut and sample the steel bars using the shearing principle. The cut ends of the steel bars are uneven and the cut surfaces are irregular, making it impossible to measure the length accurately. Secondary processing using a grinder or abrasive wheel is required, which is time-consuming and labor-intensive. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a measuring tool and method for measuring the weight deviation of reinforcing bars, thereby solving the problem that existing methods result in uneven ends and irregular cut surfaces on the cut reinforcing bars, making accurate length measurement impossible and requiring secondary processing with a grinder or abrasive wheel, which is time-consuming and labor-intensive.

[0004] This invention provides a tool for detecting weight deviation of reinforcing bars, including a test bucket, a water level gauge, and an end sealing sleeve. The water level gauge is vertically arranged on one side of the test bucket, and the lower parts of the water level gauge and the test bucket are connected to form a communicating vessel. The sample is placed inside the test bucket, and the end sealing sleeve is used to fit and fix the two ends of the sample and prevent liquid from entering the end sealing sleeves at both ends of the sample.

[0005] This invention also provides a method for detecting weight deviation of reinforcing steel using the aforementioned tool. This method involves vertically installing a water level gauge on one side of the test tank to form a communicating vessel. The value marked on the scale of the water level gauge corresponds to the total volume of liquid in the test tank and the water level gauge when the liquid reaches that scale. In specific use, the following steps are followed: ① Level the test tank and inject an appropriate amount of pure water, measure the water temperature, and determine the theoretical density ρ based on the measured water temperature. 理论1. Read the volume of pure water V1 on the water level gauge. 2. Weigh the net weight of the sample as m, place the sample with the surface wetted into the test barrel, and read the volume of the sample V2 on the water level gauge. 3. Take out the sample, and put the end sealing sleeves into the test barrel in pairs for each sample, and read the volume of the sample V3 on the water level gauge. Take out all the end sealing sleeves. 4. Install end sealing sleeves on both ends of each sample, with an exposed length of 50cm for each sample, accurate to 0.1cm. 5. Place the samples with end sealing sleeves into the test barrel one by one, and read the volume of the sample V4 on the water level gauge. 6. Calculate the total volume of the sample V = V2 - V1, calculate the sample density ρ = m / V, and calculate the total volume V of the 50cm section of the sample. 50 =V4-V3, calculate the mass m1 of the 50cm section of the sample: m1 = ρ×V 50 Calculate the sample cross-section S = m1 / h1, h1 = 50cm × number of samples, calculate the sample length h = m / s, ⑥ weight deviation = (m - (h × ρ 理论 )) / (h×ρ 理论 100%.

[0006] Compared with existing technologies, this invention designs a tool and method for measuring volume using the water displacement method. By measuring the mass and volume of all samples, the actual density is calculated. The cross-sectional area of ​​the rebar is calculated by measuring the sum of the volumes of each 50cm section of the rebar sample, and then the total length of the sample is obtained. The weight deviation of the sample is calculated using a standard formula. This tool and testing method can accurately calculate the total length of rebar samples with uneven ends and irregular cut surfaces, providing basic data for calculating the weight deviation of the rebar. No secondary processing of the sample is required, saving time and labor. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the present invention.

[0008] In this context, 1 represents the test barrel, 2 represents the water level gauge, 3 represents the sample, and 4 represents the end sealing sleeve. Detailed Implementation

[0009] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0010] Example

[0011] As attached Figure 1As shown, this embodiment provides an improved tool for measuring the weight deviation of steel reinforcement quality inspection. The tool includes a test barrel 1, a water level gauge 2, and an end sealing sleeve 4. The water level gauge 2 is vertically arranged on one side of the test barrel 1, and the lower parts of the water level gauge 2 and the test barrel 1 are connected to form a communicating vessel. The value marked on the scale line of the water level gauge 2 corresponds to the total volume of liquid in the test barrel 1 and the water level gauge 2 when the liquid reaches the scale line. The sample 3 is placed in the test barrel 1. The end sealing sleeve 4 is used to fit and fix the two ends of the sample 3 and prevent liquid from entering the end sealing sleeve 4 at both ends of the sample 3.

[0012] The specific usage method of this tool is as follows: ① Level the test tank 1, pour in an appropriate amount of pure water, measure the water temperature, and determine the theoretical density ρ based on the measured water temperature. 理论 1. Read the volume of pure water V1 from the water level gauge 2. 2. Weigh the net weight of sample 3 as m, place the wetted sample 3 into test barrel 1, and read the volume of pure water V2 from the water level gauge 2. 3. Take out sample 3, and place the end sealing sleeves 4 into test barrel 1 in pairs for each sample. Read the volume of pure water V2 from the water level gauge 2. Take out all the end sealing sleeves 4. 4. Install end sealing sleeves 4 at both ends of each sample, with an exposed length of 50cm for each sample, accurate to 0.1cm. 5. Place the sample 3 with end sealing sleeves 4 into test barrel 1 in sequence. After installing end sealing sleeves 4 at both ends of sample 3 and placing it in water, ensure that water cannot enter the end sealing sleeves 4. Read the volume of pure water V4 from the water level gauge 2. 6. Calculate the total volume of the sample V = V2 - V1, calculate the sample density ρ = m / V, and calculate the total volume V of the 50cm section of the sample. 50 =V4-V3, calculate the mass m1 of the 50cm section of the sample: m1 = ρ×V 50 Calculate the sample cross-section S = m1 / h1 (h1 = 50cm × number of samples), calculate the sample length h = m / s, ⑥ weight deviation = (m - (h × ρ 理论 )) / (h×ρ 理论 100%.

[0013] This set of tools and testing methods can detect weight deviations in steel bar samples with uneven ends and irregular cut surfaces. It ensures data accuracy, saves labor and time wasted on secondary processing, and improves testing efficiency.

Claims

1. A method for detecting weight deviation in reinforcing steel bars, characterized in that: This method forms a communicating vessel by vertically setting a water level gauge (2) on one side of the test tank (1). The value marked on the scale line of the water level gauge (2) corresponds to the total volume of liquid in the test tank (1) and the water level gauge (2) when the liquid reaches that scale line. In specific use, the following steps are followed: ① Level the test tank (1) and inject an appropriate amount of pure water, measure the water temperature, and determine the theoretical density ρ based on the measured water temperature. 理论 ① Read the volume of pure water V1 from the water level gauge (2). ② Weigh the net weight of the sample (3) as m, put the wetted sample (3) into the test bucket (1), and read the volume of pure water V2 from the water level gauge (2). ③ Take out the sample (3), put the end sealing sleeve (4) into the test bucket (1) in pairs for each sample, and read the volume of pure water V3 from the water level gauge (2). ④ Take out all the end sealing sleeves (4). ⑤ Install the end sealing sleeves (4) at both ends of each sample, with an exposed length of 50cm for each sample, accurate to 0.1cm. ⑥ Put the sample (3) with end sealing sleeves (4) into the test bucket (1) in sequence, and read the volume of pure water V4 from the water level gauge (2). ⑦ Calculate the total volume of the sample V = V2 - V1, calculate the density of the sample ρ = m / V, and calculate the total volume V of the 50cm section of the sample. 50 = V4-V3, calculate the mass m1 of the 50cm section of the sample: m1 = ρ×V 50 Calculate the cross-section of the specimen, S=V 50 / h 1， h1 = 50cm × number of samples; calculate sample length h = V 50 / S;⑥ Weight deviation = (m-(V×ρ) 理论 )) / (V×ρ 理论 100%; A measuring tool for measuring the weight deviation of steel reinforcement quality detection using the above method includes a test bucket (1), a water level gauge (2) and an end sealing sleeve (4). The water level gauge (2) is vertically arranged on one side of the test bucket (1), and the lower parts of the water level gauge (2) and the test bucket (1) are connected to form a communicating vessel. The sample (3) is placed inside the test bucket (1). The end sealing sleeve (4) is used to fit and fix the two ends of the sample (3) and prevent liquid from entering the end sealing sleeve (4) at both ends of the sample (3).

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