CN117091990A - Steel pipe concrete compactness safety detection method based on stress level - Google Patents
Steel pipe concrete compactness safety detection method based on stress level Download PDFInfo
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- CN117091990A CN117091990A CN202310957550.1A CN202310957550A CN117091990A CN 117091990 A CN117091990 A CN 117091990A CN 202310957550 A CN202310957550 A CN 202310957550A CN 117091990 A CN117091990 A CN 117091990A
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- steel tube
- concrete
- filled steel
- compactness
- concrete filled
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000002950 deficient Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 239000011800 void material Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a method for detecting the compactness and safety of concrete filled steel tubes based on stress level, which comprises the following steps: after the concrete filled steel tube member is poured, when the upper part of the concrete filled steel tube member is not loaded, detecting the compactness of the concrete filled steel tube member so as to determine the compactness of the concrete filled steel tube member when the upper part of the concrete filled steel tube member is not loaded; taking a concrete filled steel tube member, and after concrete pouring is completed, carrying out strain monitoring and blind hole method stress detection on the inner part and the surface of the concrete filled steel tube member so as to determine the load ratio of the concrete filled steel tube member; and detecting the compactness of the concrete in the steel tube concrete member with different load ratios, so as to obtain the compactness change condition of the steel tube concrete member under the condition of different load ratios. According to the method for testing the compactness of the concrete filled steel tube, the compactness of the concrete filled steel tube is detected under the action of different stresses, so that the accuracy of a result is improved, and the safety of a structure is ensured.
Description
Technical Field
The invention relates to the technical field of nondestructive testing of a combined structure, in particular to a method for detecting the compactness and safety of concrete filled steel tube based on stress level.
Background
The traditional steel tube concrete compactness detection flow does not consider the influence of detection time and different stress effects on the compactness of the steel tube concrete member, the steel tube concrete can cause internal concrete expansion under the condition of compression, the compactness is increased, and the influence of the concrete expansion on the compactness is not considered in the prior art.
Disclosure of Invention
In view of the above, the invention provides a method for detecting the compactness safety of concrete filled steel tube based on stress level, which aims to solve the problem of inaccurate compactness test result of the existing concrete filled steel tube.
The invention provides a method for detecting the compactness and safety of concrete filled steel tube based on stress level, which comprises the following steps:
step 1, after pouring of a concrete filled steel tube member is completed, when the upper part of the concrete filled steel tube member is not loaded, detecting the compactness of the concrete filled steel tube member so as to determine the compactness of the concrete filled steel tube member when the upper part of the concrete filled steel tube member is not loaded;
step 2, taking a concrete filled steel tube member, and after concrete pouring is completed, carrying out strain monitoring and blind hole method stress detection on the inner part and the surface of the concrete filled steel tube member so as to determine the load ratio of the concrete filled steel tube member;
and 3, detecting the compactness of the concrete inside the steel tube concrete member with different load ratios, and obtaining the compactness change condition of the steel tube concrete member under the condition of different load ratios so as to evaluate the safety of the steel tube concrete member.
In the method for detecting the compactness and safety of the steel tube concrete based on the stress level, in the step 2, after the steel tube concrete is poured, the compactness of the concrete inside the steel tube concrete member is detected under a preset load ratio.
Further, in the method for detecting the compactness and safety of the concrete filled steel tube based on the stress level, the preset load ratio is 0.2, 0.4, 0.6 or 0.8.
Further, in the method for detecting the compactness and safety of the concrete filled steel tube based on the stress level, the safety of the concrete filled steel tube member is evaluated as follows:
even if the concrete filled steel tube member is defective, the concrete filled steel tube member is safe when the upper load thereof is small; even if the concrete filled steel tube member is defective, it has less influence on its bearing capacity, and the concrete filled steel tube member is safe.
The method for detecting the compactness of the steel tube concrete based on the stress level considers the influence of the stress on the compactness of the interior of the steel tube concrete, is beneficial to improving the accuracy of the compactness test result of the steel tube concrete, detects the compactness of the steel tube concrete under the action of different stresses, reasonably evaluates the safety condition of the component by combining the compactness condition and the loading condition, improves the reliability of the judging result, and ensures the safety of the structure.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic flow chart of a method for detecting the compactness and safety of concrete filled steel tubes based on stress level, which is provided by the embodiment of the invention;
FIG. 2 is a schematic flow chart of another method for detecting the compactness and safety of concrete filled steel tube based on stress level according to the embodiment of the invention;
FIG. 3 is a schematic view showing the state change of the compactness increasing with the increase of construction and load according to the embodiment of the present invention;
fig. 4 is a graph of void fraction versus bearing capacity analysis provided in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 and 2, the method for detecting the compactness safety of the concrete filled steel tube based on the stress level according to the embodiment of the invention comprises the following steps:
and 1, after the concrete filled steel tube member is poured, when the upper part of the concrete filled steel tube member is not loaded, detecting the compactness of the concrete filled steel tube member so as to determine the compactness of the concrete filled steel tube member when the upper part of the concrete filled steel tube member is not loaded.
Specifically, an initial concrete filled steel tube member may be taken and subjected to compactness detection. Since there is no load on the original concrete filled steel tube member, the detected compactness can be used as the compactness of the concrete filled steel tube member in an ideal state.
And 2, taking a concrete filled steel tube member, and carrying out strain monitoring and blind hole method stress detection on the inner part and the surface of the concrete filled steel tube member after concrete pouring is completed so as to determine the load ratio of the concrete filled steel tube member.
In the concrete implementation, as the load born by the member is gradually increased along with the capping of the storey, another group of steel pipe concrete members are taken, and after the concrete is poured, the load ratio of the steel pipe concrete members is determined after the strain detection and the stress detection are carried out on the concrete.
And 3, detecting the compactness of the concrete inside the steel tube concrete member with different load ratios, and obtaining the compactness change condition of the steel tube concrete member under the condition of different load ratios so as to evaluate the safety of the steel tube concrete member.
Specifically, after the concrete-filled steel tube pouring is completed, detecting the compactness of the concrete in the concrete-filled steel tube member under a preset load ratio. The compactness of the same concrete filled steel tube member under different load ratios is tested.
The preset load ratio is 0.2, 0.4, 0.6 or 0.8.
Referring to fig. 3, it can be seen that the compactness of the concrete filled steel tube member increases even though the load ratio increases gradually, and the two members are in positive correlation.
Specifically, the judgment for evaluating the safety of the concrete filled steel tube member is as follows:
even if the concrete filled steel tube member is defective, the concrete filled steel tube member is safe when the upper load thereof is small; even if the concrete filled steel tube member is defective, it has less influence on its bearing capacity, and the concrete filled steel tube member is safe.
In this embodiment, the sizes of the bearing capacities of the components corresponding to the different void defect areas are calculated, and the obtained change rule of the bearing capacity along with the void rate is shown in the following chart, wherein the bearing capacity coefficient si=nt/Nh, and Nh is the theoretical calculation value Nt of the bearing capacity of the healthy component; the void fraction is the defect area divided by the component cross-sectional area. The area void ratio limit is determined by taking the limit that the theoretical calculation value of the bearing capacity is reduced to 95% of the theoretical calculation value of the bearing capacity of the healthy component, referring to fig. 4, the void limit of the cylindrical spherical cap is 1.09%, the void limit of the cylindrical annular ring is 0.16%, the void limit of the square spherical cap is 3.58%, and the void limit of the square annular ring is 0.37%. The calculation also shows that the corresponding concrete expansion can completely fill the area void ratio inside the steel pipe, and below the area void ratio, the void position can be gradually filled with core concrete along with the increase of the load.
According to the method for detecting the compactness of the concrete filled steel tube based on the stress level, provided by the invention, the influence of the stress on the compactness of the concrete filled steel tube is considered, the accuracy of the compactness test result of the concrete filled steel tube is improved, the compactness of the concrete filled steel tube is detected under the action of different stresses, the safety condition of a component is reasonably evaluated by combining the compactness condition and the loading condition, the reliability of the result is improved, and the safety of the structure is ensured.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. The method for detecting the compactness safety of the concrete filled steel tube based on the stress level is characterized by comprising the following steps of:
step 1, after pouring of a concrete filled steel tube member is completed, when the upper part of the concrete filled steel tube member is not loaded, detecting the compactness of the concrete filled steel tube member so as to determine the compactness of the concrete filled steel tube member when the upper part of the concrete filled steel tube member is not loaded;
step 2, taking a concrete filled steel tube member, and after concrete pouring is completed, carrying out strain monitoring and blind hole method stress detection on the inner part and the surface of the concrete filled steel tube member so as to determine the load ratio of the concrete filled steel tube member;
and 3, detecting the compactness of the concrete inside the steel tube concrete member with different load ratios, and obtaining the compactness change condition of the steel tube concrete member under the condition of different load ratios so as to evaluate the safety of the steel tube concrete member.
2. The method for detecting the compactness and safety of the steel tube concrete based on the stress level according to claim 1, wherein in the step 3, after the steel tube concrete is poured, the compactness of the concrete inside the steel tube concrete member is detected under a preset load ratio.
3. A method for detecting the compactness safety of concrete filled steel tubes based on stress levels as claimed in claim 1, wherein the preset load ratio is 0.2, 0.4, 0.6 or 0.8.
4. The method for detecting the compactness safety of the concrete filled steel tube based on the stress level according to claim 1, wherein in the step 3, the safety of the concrete filled steel tube member is evaluated as follows:
even if the concrete filled steel tube member is defective, the concrete filled steel tube member is safe when the upper load thereof is small; even if the concrete filled steel tube member is defective, it has less influence on its bearing capacity, and the concrete filled steel tube member is safe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310957550.1A CN117091990A (en) | 2023-08-01 | 2023-08-01 | Steel pipe concrete compactness safety detection method based on stress level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310957550.1A CN117091990A (en) | 2023-08-01 | 2023-08-01 | Steel pipe concrete compactness safety detection method based on stress level |
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| Publication Number | Publication Date |
|---|---|
| CN117091990A true CN117091990A (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310957550.1A Pending CN117091990A (en) | 2023-08-01 | 2023-08-01 | Steel pipe concrete compactness safety detection method based on stress level |
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| CN (1) | CN117091990A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1164069A (en) * | 1956-12-29 | 1958-10-06 | Process for improving the mechanical characteristics of imperfectly compact solids | |
| CN104947560A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Pile-net composite roadbed pile top differential settlement control method |
| CN109357946A (en) * | 2018-10-19 | 2019-02-19 | 华能西藏雅鲁藏布江水电开发投资有限公司 | Self-compacting concrete hydration test system |
| CN109783988A (en) * | 2019-03-01 | 2019-05-21 | 中国水利水电第七工程局有限公司 | A kind of grinding coagulation soil compaction evaluation method based on GA-BP network |
| CN114186459A (en) * | 2021-12-08 | 2022-03-15 | 哈尔滨工业大学（深圳） | Steel pipe concrete compactness evaluation standard method based on finite element model |
-
2023
- 2023-08-01 CN CN202310957550.1A patent/CN117091990A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1164069A (en) * | 1956-12-29 | 1958-10-06 | Process for improving the mechanical characteristics of imperfectly compact solids | |
| CN104947560A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Pile-net composite roadbed pile top differential settlement control method |
| CN109357946A (en) * | 2018-10-19 | 2019-02-19 | 华能西藏雅鲁藏布江水电开发投资有限公司 | Self-compacting concrete hydration test system |
| CN109783988A (en) * | 2019-03-01 | 2019-05-21 | 中国水利水电第七工程局有限公司 | A kind of grinding coagulation soil compaction evaluation method based on GA-BP network |
| CN114186459A (en) * | 2021-12-08 | 2022-03-15 | 哈尔滨工业大学（深圳） | Steel pipe concrete compactness evaluation standard method based on finite element model |
Non-Patent Citations (3)
| Title |
|---|
| Л.Б.盖金茨维: "道路沥青混凝土稳定性的研究", 31 December 1981, 中国建筑工业出版社, pages: 81 - 84 * |
| 林冬;黄炳生;杨利生;: "自密实钢管混凝土的研究与应用现状", 混凝土, no. 12, 27 December 2008 (2008-12-27), pages 91 - 92 * |
| 沈培辉;杨平;: "路面压实密实度评价方法的研究现状及展望", 工程与试验, no. 02, 15 June 2010 (2010-06-15), pages 1 - 4 * |
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