CN113640086B - Manufacturing method of steel tube concrete void detection test piece - Google Patents
Manufacturing method of steel tube concrete void detection test piece Download PDFInfo
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- CN113640086B CN113640086B CN202111000283.6A CN202111000283A CN113640086B CN 113640086 B CN113640086 B CN 113640086B CN 202111000283 A CN202111000283 A CN 202111000283A CN 113640086 B CN113640086 B CN 113640086B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 149
- 239000010959 steel Substances 0.000 title claims abstract description 149
- 239000011800 void material Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000007547 defect Effects 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000295 complement 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
- 230000002950 deficient Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a manufacturing method of a concrete filled steel tube void detection test piece, which comprises the following steps: s1: manufacturing a defect body; s2: fixing the defect body on the inner wall of a steel pipe, internally installing a template and a supporting rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and curing; s3: removing the stay bar, the template and the steel pipe, and removing the defect body to obtain a prefabricated member; s4: adhering the prefabricated member to a designated position on the inner wall of the steel pipe; s5: sealing the lower end of the steel pipe; s6: concrete is poured into the steel pipe, and sealing measures are adopted at the upper end of the steel pipe. According to the manufacturing method of the steel pipe concrete void detection test piece, firstly, the prefabricated member containing the defects is manufactured by utilizing the steel pipe, then the prefabricated member is adhered to the inner wall of the steel pipe, and finally concrete is poured, so that the test piece is manufactured, the success rate of the method for manufacturing the test piece is high, and the operation difficulty is low.
Description
Technical Field
The invention relates to the technical field of structure detection, in particular to a manufacturing method of a concrete filled steel tube void detection test piece.
Background
In recent years, concrete filled steel tubes are widely used in super high-rise buildings and large-span bridges, and the cross section of the concrete filled steel tubes is mainly round. The steel pipe and the concrete complement each other, on one hand, the steel pipe is similar to stirrups, so that the three-way compression resistance of the concrete is enhanced, and on the other hand, the problem of potential instability of the steel pipe is solved by filling the concrete.
With the increase of concrete filled steel tube applications in practical engineering, many internal concrete and the inner surface of the steel tube are found to have gaps, which are called void with large thickness and are commonly called debonding with small thickness. The rib of the steel pipe concrete arch bridge is exposed in the field and is poured by pumping concrete, and it is generally considered that the construction is carried out according to the relevant process standard, the inside of the concrete can be compacted, but the void between the concrete and the steel pipe is unavoidable. The main reasons for the void are the shrinkage of the concrete in the process of forming strength, the radial shrinkage of the concrete under the action of temperature in the use process, or the detachment of the concrete and the steel pipe caused by the radial expansion of the steel pipe, etc. In building structures, it is mainly this interfacial debonding that causes radial debonding. The void directly affects the combined action of the steel pipe and concrete, and most design specifications currently do not consider the effect of void.
From the exterior, the condition of concrete inside the steel pipe cannot be observed, and how to detect the void of the concrete inside the steel pipe in an actual engineering structure is attracting attention. The existing detection method mainly comprises an ultrasonic method, a knocking method, a transient impact method, a piezoelectric ceramic method and the like. In order to study the detection effect of various detection methods, mainly the detection of the void area and the void depth, a steel pipe concrete void detection test piece needs to be manufactured, the designed known defects are tested, the various detection methods are calibrated and calibrated, and the corresponding quantitative methods when the various methods are adopted are determined.
It is difficult to make a specific void defect in the concrete filled steel tube test piece. At present, a manufacturing method for sticking a foam block on the inner wall of a steel pipe exists, but the existence of the foam block influences the propagation of elastic waves in vibration, and particularly when the steel pipe outside the defect is knocked on, the foam block influences the sound amplitude and the frequency composition of generated sound. Because the concrete of the test piece is dried and contracted in the strength forming process, the debonding of the steel tube and the concrete often occurs outside the set void defect range, and the test result is affected.
Disclosure of Invention
The application provides a manufacturing method of a concrete filled steel tube void detection test piece, which solves the technical problem of high technical difficulty in manufacturing a detection test piece with specific void defects in the prior art.
The application provides a manufacturing method of a concrete filled steel tube void detection test piece, which comprises the following steps:
s1: manufacturing a defect body, wherein the shape of the outer surface of the defect body is the same as the set defect;
s2: fixing the defect body on the inner wall of a steel pipe, internally installing a template and a supporting rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and curing the concrete with the top higher than the upper surface of the defect body;
s3: after the concrete between the template and the inner wall of the steel pipe is formed, removing the stay bar, the template and the steel pipe, and removing the defect body to obtain a prefabricated block; cutting the concrete around the defect of the precast block, so that the side wall of the concrete is arranged around the defect of the precast block, and obtaining a precast product;
s4: adhering the prefabricated member to a designated position on the inner wall of the steel pipe;
s5: adopting end anti-debonding measures at two ends of the steel pipe, and adopting sealing measures at the lower end;
s6: concrete is poured into the steel pipe, and sealing measures are adopted at the upper end of the steel pipe.
In some embodiments, in step S5, the end anti-debonding measures are that a plurality of bolt holes distributed along the circumference are drilled on the wall of the steel pipe near the two ends, bolts are installed in the steel pipe, each screw is provided with a nut inside and outside the steel pipe, and the two nuts are screwed to fix the corresponding bolts.
In some embodiments, a bolt head of the bolt is disposed within the steel tube.
In some embodiments, the nut outside the steel tube is padded with a rubber pad to ensure that the corresponding bolt hole is airtight.
In some embodiments, the bolts at each end of the steel pipe form a layer, the bolts being at least 5 cm from the corresponding end of the steel pipe.
In some embodiments, the bolts at each end of the steel pipe form two layers, and the space between the two layers of bolts is at least 5 cm.
In some embodiments, in step S6, a backing plate having an outer diameter smaller than an inner diameter of the steel pipe is placed over the steel pipe, and a balancing weight is placed on the backing plate.
In some embodiments, sealing measures of the upper end and the lower end of the steel pipe are sealing covers, and sealing tape is used for sealing joints of the sealing covers and the side walls of the steel pipe.
In some embodiments, the sealing cover is made of rubber.
In some embodiments, in step S6, after the prefabricated member is stuck in the steel pipe, water is sprayed to wet the prefabricated member, and after the surface of the prefabricated member is dried, the accumulated water in the steel pipe is discharged, and then concrete is poured into the steel pipe.
The beneficial effects of the application are as follows:
1. the manufacturing method of the steel pipe concrete void detection test piece provided by the application comprises the steps of firstly manufacturing a prefabricated member containing defects by using a steel pipe, then pasting the prefabricated member on the inner wall of the steel pipe, and finally pouring concrete to manufacture the test piece, wherein the method for manufacturing the test piece is high in operability and has no special requirements on the technology of manufacturing personnel;
2. the concrete and the steel pipe are firmly connected together by adding bolt connection, so that debonding is avoided;
3. the backing plate and the balancing weight are placed on the top of the poured concrete, so that the concrete in the steel pipe is pressurized, the shrinkage in the stage of forming the strength of the concrete can be avoided, the hoop tension in the steel pipe can provide a certain hoop force for the concrete, the debonding of the concrete and the steel pipe is avoided, and the operation is simple and the effect is good;
4. sealing covers are arranged at the two ends of the steel pipe, and adhesive tapes are adopted, so that the two ends of the steel pipe are prevented from being exposed in the air due to the fact that the ends are debonded due to desiccation and desiccation caused by water loss, and otherwise, the debonded ends of the steel pipe can be rapidly expanded to the whole test piece;
5. the scheme has less material addition, low cost and no increase of test piece manufacturing difficulty; when the test piece is dismantled after the test is finished, concrete at the end part of the test piece is removed only by using a pneumatic pick, bolts are removed, and the steel pipe and the concrete inside the steel pipe can be rapidly debonded by adopting methods such as knocking or heating, so that the steel pipe is convenient to dismantle, other test pieces are convenient to manufacture by adopting the steel pipe, and the test cost can be reduced by recycling the steel pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention.
FIG. 1 is a schematic vertical cross-section of a test piece centerline and a void defect in the present application;
FIG. 2 is a schematic cross-sectional view of a test piece passing through the center line of a bolt in the present application;
FIG. 3 is an enlarged schematic view of a portion of the void defect of FIG. 1;
FIG. 4 is a schematic front view of the void defect in the present application (the steel tube is not shown);
FIG. 5 is a schematic cross-sectional view of a test piece with over-run defects in the present application;
FIG. 6 is a schematic illustration of a template for fabricating a preform in the present application;
fig. 7 is a schematic view of the curing stage of the test piece after casting concrete in the present application.
Wherein, 1-steel pipe, 2-concrete, 3-void defect, 4-sealing cover, 6-bolt, 7-sealing tape, 8-prefabrication, 9-defect body, 10-template, 11-stay bar, 12-backing plate, 13-balancing weight.
Detailed Description
The embodiment of the application solves the technical problem that the technical difficulty of manufacturing the test piece for detecting the specific void defects in the prior art is high by providing the manufacturing method of the test piece for detecting the void of the concrete filled steel tube, and is shown in figures 1-7.
The steel pipe 1 and the concrete 2 form steel pipe concrete. The steel pipe 1 is a section of seamless steel pipe, the inner diameter is 610mm, the wall thickness is 10mm, and the height is 1500mm; the void defect 3 is positioned in the middle of the steel pipe 1, the thickness of the void defect 3 is 5mm, the length of the void defect is 250mm along the axial direction of the steel pipe 1, and the corresponding central angle along the circumferential direction of the steel pipe 1 is 20 degrees.
The method specifically comprises the following steps:
s1: the defect body 9 is manufactured, and the outer surface shape of the defect body is the same as the set defect. When the defect body 9 is manufactured, gypsum is closely attached to the inner surface of the steel pipe 1, a blank of the defect body 9 is manufactured, after the gypsum is solidified and reaches enough strength, the blank is taken out, the surface of the blank is polished, and the shape of the outer surface of the blank is the same as the set defect, so that the defect body 9 is obtained. In the polishing process, the side surface contacted with the steel pipe 1 is only corrected in size and is not polished in the radial direction; treating the outer surface of the defective body 9 with a waterproof coating;
s2: fixing the defect body 9 on the inner wall of the steel pipe 1, internally installing a template 10 and a supporting rod 11 in the steel pipe 1, wherein the bottom surface of the defect body 9 is 10mm higher than the bottom end of the steel pipe 1, the height of the template 10 is 270mm, pouring concrete between the template 10 and the inner wall of the steel pipe 1, enabling the top of the concrete to be level with the top of the template 10, and curing;
s3: after the concrete between the template 10 and the inner wall of the steel pipe 1 is formed, removing the stay bars 11, the template 10 and the steel pipe 1, and removing the defect body 9 to obtain a prefabricated block; cutting the concrete around the defect of the precast block, so that the side wall of the concrete is 5mm around the defect of the precast block, and obtaining a precast member 8;
s4: adhering the prefabricated member 8 at a designated position on the inner wall of the steel pipe 1, wherein the adhered prefabricated member 8 is made of cement-doped epoxy resin adhesive, so that the steel pipe is secure and airtight;
s5: firstly, adopting end anti-debonding measures at two ends of the steel pipe 1, drilling a plurality of circumferentially distributed bolt holes on the wall of the steel pipe 1 close to the two ends, wherein the distance between the bolt holes and the corresponding end of the steel pipe 1 is 100mm, the number of the bolt holes is 8 and is uniformly distributed, installing bolts 6 in the steel pipe 1, each bolt is provided with a nut inside and outside the steel pipe 1, screwing two nuts to fix the corresponding bolts 6, arranging the bolt heads of the bolts 6 in the steel pipe 1, and the nuts on the outer side of the steel pipe 1 are padded with rubber pads to ensure the tightness of the corresponding bolt holes; adopting sealing measures at the lower end of the steel pipe 1, wherein the sealing cover 4 is made of rubber, the thickness of the rubber sealing cover 4 is 2mm, and the joint between the sealing cover 4 and the side wall of the steel pipe 1 is sealed by adopting a sealing adhesive tape 7;
s6: concrete is poured into the steel pipe 1, and sealing measures are adopted at the upper end of the steel pipe 1. After the prefabricated member 8 is stuck in the steel pipe 1, water is sprayed to wet the prefabricated member 8, after the surface of the prefabricated member 8 is dried, accumulated water in the steel pipe 1 is discharged, and then concrete 2 is poured into the steel pipe 1. The sealing of the upper end is the same as in the previous working step. A backing plate 12 with the outer diameter smaller than the inner diameter of the steel pipe 1 is placed above the steel pipe 1, the diameter of the backing plate 12 is 600mm, and a balancing weight 13 is placed on the backing plate 12.
After the concrete filled steel tube void detection test piece is tested, the steel tube 1 can be reused. Only the external nuts are needed to be screwed off, a part of the concrete 2 at the end part is chiseled off, and the bolts 6 are taken out; then the outer wall of the steel pipe 1 is beaten, and the concrete 2 and the inner wall of the steel pipe 1 can be separated by debonding by heating.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
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 (10)
1. The manufacturing method of the steel tube concrete void detection test piece is characterized by comprising the following steps of:
s1: manufacturing a defect body, wherein the shape of the outer surface of the defect body is the same as the set defect;
s2: fixing the defect body on the inner wall of a steel pipe, internally installing a template and a supporting rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and curing the concrete with the top higher than the upper surface of the defect body;
s3: after the concrete between the template and the inner wall of the steel pipe is formed, removing the stay bar, the template and the steel pipe, and removing the defect body to obtain a prefabricated block; cutting the concrete around the defect of the precast block, so that the side wall of the concrete is arranged around the defect of the precast block, and obtaining a precast product;
s4: adhering the prefabricated member to a designated position on the inner wall of the steel pipe;
s5: adopting end anti-debonding measures at two ends of the steel pipe, and adopting sealing measures at the lower end;
s6: concrete is poured into the steel pipe, and sealing measures are adopted at the upper end of the steel pipe.
2. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 1, wherein in step S5, the end portion anti-debonding measures are that a plurality of bolt holes distributed along the circumference are drilled on the wall of the steel tube near both ends, bolts are installed in the steel tube, each screw is provided with a nut inside and outside the steel tube, and the two nuts are screwed to fix the corresponding bolts.
3. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 2, wherein a bolt head of the bolt is disposed in the steel tube.
4. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 2, wherein the nut on the outer side of the steel tube is padded with a rubber pad to ensure the tightness of the corresponding bolt hole.
5. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 2, wherein the bolts at each end of the steel tube form a layer, and the distance from the bolts to the corresponding end of the steel tube is at least 5 cm.
6. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 2, wherein the bolts at each end of the steel tube form two layers, and the distance between the two layers of bolts is at least 5 cm.
7. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 1, wherein in step S6, a backing plate having an outer diameter smaller than an inner diameter of the steel tube is placed above the steel tube, and a balancing weight is placed on the backing plate.
8. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 1, wherein sealing measures of the upper end and the lower end of the steel tube are sealing covers, and sealing tape is adopted to seal joints of the sealing covers and the side walls of the steel tube.
9. The method for manufacturing a concrete filled steel tube void detection test piece according to claim 8, wherein the sealing cover is made of rubber.
10. The method for manufacturing a test piece for detecting void of concrete filled steel tube according to claim 1, wherein in step S6, after the prefabricated member is stuck in the steel tube, water is sprayed to wet the prefabricated member, and after the surface of the prefabricated member is dried, accumulated water in the steel tube is discharged, and concrete is poured into the steel tube.
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| CN202111000283.6A CN113640086B (en) | 2021-08-27 | 2021-08-27 | Manufacturing method of steel tube concrete void detection test piece |
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| CN202111000283.6A CN113640086B (en) | 2021-08-27 | 2021-08-27 | Manufacturing method of steel tube concrete void detection test piece |
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| CN113640086B true CN113640086B (en) | 2023-12-29 |
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| JP2003185542A (en) * | 2001-12-17 | 2003-07-03 | Showa Concrete Ind Co Ltd | Concrete sample for nondestructive inspection, defective body used for the same, and manufacturing method for the concrete sample for nondestructive inspection |
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| CN113295484A (en) * | 2021-04-21 | 2021-08-24 | 重庆交通大学 | Method for manufacturing concrete test piece for simulating water-containing cavity defect |
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2021
- 2021-08-27 CN CN202111000283.6A patent/CN113640086B/en active Active
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| WO2017211329A2 (en) * | 2016-06-07 | 2017-12-14 | 华南理工大学 | Semi-prefabricated concrete-filled steel tubular column having inner high-strength steel, and fabrication method for same |
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Effective date of registration: 20231122 Address after: 450000 No. 70, science Avenue, high tech Zone, Zhengzhou City, Henan Province Applicant after: Sinosteel Zhengzhou metal products Research Institute Co.,Ltd. Applicant after: JULUN (GUANGZHOU) ROBOT AND INTELLIGENCE MANUFACTURING Co.,Ltd. Address before: 450000 No. 70, science Avenue, high tech Zone, Zhengzhou City, Henan Province Applicant before: Sinosteel Zhengzhou metal products Research Institute Co.,Ltd. |
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