CN105588764A - Method and device for simply and conveniently detecting strength of building steel - Google Patents

Abstract

The invention discloses a method and a device for simply detecting the strength of building steel. The present invention carries out the detection of the critical index on the detection device provided by the present invention with the qualified standard sample of known strength, to determine the standard deflection and the standard load, adopts the same method to test the sample to be tested according to the standard load, and observes the sample to be tested The deformation of the sample and the relationship between the deflection to be tested and the standard deflection can quickly determine whether the strength of the sample to be tested is qualified. This method can achieve qualitative conclusions without quantifying the detection results, which greatly improves the detection efficiency and construction efficiency of on-site steel products. It is a fast, effective, economical and applicable detection method.

Description

Method and device for simply testing the strength of building steel

technical field

The invention relates to the technical field of detection, in particular to a method for simply detecting the strength of building steel.

Background technique

In construction sites and other places, a large amount of steel materials such as various steel bars, steel plates and section steels are usually used, and these steel materials usually have to be tested for their mechanical properties before they can be used, but because there are no ready-made experimental testing equipment on the construction site , so the on-site steel to be inspected cannot be detected in time, resulting in a delay in the construction period.

The strength of construction steel refers to the ability of the material to resist fracture under the action of external force. The strength of construction steel is an important index that must be measured in use.

Contents of the invention

The purpose of the present invention is to provide a method for easily detecting the strength of building steel, which can quickly measure the strength of building steel, and has simple operation and low cost.

The present invention is realized in the following way: the method for conveniently detecting the strength of building steel materials is to carry out the detection of the critical index on the standard sample whose strength is known to be qualified; Determine the standard deflection ΔH ₀ and the corresponding standard load P ₀ when the standard sample just reaches the plastic deformation; place the sample to be tested horizontally and horizontally, and fix both ends, and use a wire rope to hang a standard pressure weight on the sample to be tested In the middle of , the load of the standard pressure weight is the standard load P ₀ ; observe the deformation of the sample to be tested: 1) If the sample to be tested does not undergo plastic deformation under the standard load P ₀ , and the deflection ΔH to be tested is not greater than ΔH ₀ , indicating that the strength of the sample to be tested is qualified; 2) If the sample to be tested has a brittle fracture under the standard load P ₀ , it means that the strength of the sample to be tested is unqualified; 3) If the sample to be tested is Plastic deformation occurs under load P ₀ , indicating that the strength of the sample is unqualified.

The device for simply testing the strength of building steel includes a bracket with a joint on the top of the bracket, a base at the bottom of the bracket, and the bracket is fixed on the base; a steel wire rope is also provided, and a standard pressure weight is set at one end of the steel wire rope.

A tray is provided at one end of the steel wire rope, and a standard pressure weight is placed in the tray. Such a structure is convenient for changing the specification of the standard pressure weight at any time, so as to adapt to steel products of different specifications.

The other end of the wire rope is a buckle or hook structure. Such a structure can quickly connect the wire rope to the sample to be tested.

Evenly distributed adjustment holes are provided on the base, and corresponding adjustment bolts are provided at the bottom of the bracket. With such a structure, the distance between the brackets can be adjusted to adapt to the detection of steel products of different lengths.

Owing to having adopted above-mentioned technical scheme, compared with prior art, the present invention carries out the detection of critical index on the detection device that the present invention provides with the standard sample that known strength is qualified, to determine standard deflection and standard load, according to standard load Use the same method to test the sample to be tested, observe the deformation of the sample to be tested and the relationship between the deflection to be tested and the standard deflection, and quickly determine whether the strength of the sample to be tested is qualified. This method can achieve qualitative conclusions without quantifying the detection results, which greatly improves the detection efficiency and construction efficiency of on-site steel products. It is a fast, effective, economical and applicable detection method.

Description of drawings

Accompanying drawing 1 is the structural representation of the present invention.

detailed description

Embodiment of the present invention: a simple method for detecting the strength of building steel, the detection of the critical index is carried out on the standard sample with known strength qualified, the standard sample is placed horizontally and horizontally, the two ends are fixed, and the load is applied from the middle to determine The standard deflection ΔH ₀ and the corresponding standard load P ₀ generated when the standard sample just reaches the plastic deformation; the sample to be tested is placed horizontally and horizontally, and both ends are fixed, and a standard pressure weight is suspended on the sample to be tested by a wire rope In the middle, the load of the standard pressure weight is the standard load P ₀ ; observe the deformation of the sample to be tested: 1) If the sample to be tested does not undergo plastic deformation under the standard load P ₀ , and the deflection ΔH to be tested is not greater than ΔH ₀ , It means that the strength of the sample to be tested is qualified; 2) If the sample to be tested has a brittle fracture under the standard load P ₀ , it means that the strength of the sample to be tested is unqualified; 3) If the sample to be tested is under the standard load Plastic deformation occurred at P ₀ , indicating that the strength of the sample was unqualified.

The device for easily detecting the strength of building steel includes a bracket 1, a joint 2 is arranged on the top of the bracket 1, a base 3 is arranged on the bottom of the bracket 1, and uniformly distributed adjustment holes are arranged on the base 3, and a joint 2 is arranged on the bottom of the bracket 1. Corresponding to the adjusting bolt 7, the bracket 1 is fixed on the base 3 through the adjusting bolt 7; a steel wire rope 4 is also provided, and a tray 6 is arranged at one end of the steel wire rope 4, and the standard pressure weight 5 is placed in the tray 6, and the wire rope 4 The other end is a buckle structure.

In this embodiment, the function of the connector 2 on the top of the bracket 1 is to fix the sample 8 to be tested so that it can be placed stably and quickly. The connector can be designed as a variety of connectors that can quickly clamp the sample 8 to be tested. structure, such as card slot structure, etc.

In order to verify the technical effect of the present invention, the applicant randomly selected 20 steels from the construction site of the Shanghai-Kunming high-speed railway in Guizhou, and used the method of the present invention to detect the 20 steels and record the detection results; Conventional mechanical property detection method is detected, and test result is recorded, and the detection result of two kinds of methods is compared, and the conclusion that two kinds of detection methods obtain is exactly the same, and the time used for adopting the scheme of the present invention is only 1 hour, and adopts existing The detection time of the technical method is about 4 hours.

Claims (5)

1. the method for an easy detection structural steel intensity, it is characterized in that: standard specimen qualified known strength is carried out to the detection of critical indicator, standard specimen horizontal cross is placed, two ends are fixed, and load application from the center, the standard amount of deflection Δ H producing while just reaching plastic deformation with the sample that settles the standard₀And corresponding normal loading P₀; Sample to be tested horizontal cross is placed, and two ends fix, adopt steel wire rope to press weight to be suspended on the middle part of sample to be tested a standard, it is normal loading P that standard is pressed the load of weight₀; Observe the deformation situation of sample to be tested: 1) if sample to be tested at normal loading P₀Under there is not plastic deformation, and amount of deflection Δ H to be measured is not more than Δ H₀, illustrate that the intensity of this sample to be tested is qualified; 2) if sample to be tested at normal loading P₀Under produced brittle fracture, illustrate that the intensity of this sample to be tested is defective; 3) if sample to be tested at normal loading P₀Under produced moulding distortion, illustrate that the intensity of this sample is defective.

2. realize the device of the method for easy detection structural steel intensity as claimed in claim 1 for one kind, comprise support (1), it is characterized in that: be provided with joint (2) at the top of support (1), be provided with base (3) in the bottom of support (1), support (1) is fixed on base (3); Separately be provided with steel wire rope (4), the standard that is provided with in one end of steel wire rope (4) is pressed weight (5).

3. device according to claim 2, is characterized in that: be provided with pallet (6) in one end of described steel wire rope (4), standard presses weight (5) to be positioned in pallet (6).

4. according to the device described in claim 2 or 3, it is characterized in that: the other end of described steel wire rope (4) is buckle or hook structure.

5. device according to claim 2, is characterized in that: on base (3), be provided with equally distributed adjustment hole, be provided with corresponding adjusting bolt (7) in support (1) bottom.