CN113640086A - Manufacturing method of steel pipe concrete void detection test piece - Google Patents
Manufacturing method of steel pipe concrete void detection test piece Download PDFInfo
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- CN113640086A CN113640086A CN202111000283.6A CN202111000283A CN113640086A CN 113640086 A CN113640086 A CN 113640086A CN 202111000283 A CN202111000283 A CN 202111000283A CN 113640086 A CN113640086 A CN 113640086A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 239000011800 void material Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 230000007547 defect Effects 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000006260 foam Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009415 formwork Methods 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
- 239000012945 sealing adhesive Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 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
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 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
- 239000003292 glue Substances 0.000 description 1
- 238000012423 maintenance Methods 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
- 238000005086 pumping Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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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
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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
-
- 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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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a manufacturing method of a steel pipe concrete 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, installing a template and a support rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and maintaining; s3: dismantling the stay bar, the template and the steel pipe, and removing the defect body to obtain a prefabricated member; s4: adhering the prefabricated part to the specified position of the inner wall of the steel pipe; s5: adopting a sealing measure for the lower end of the steel pipe; s6: and pouring concrete in the steel pipe, wherein the upper end of the steel pipe adopts a sealing measure. According to the manufacturing method of the test piece for the concrete filled steel tube void detection, the steel tube is firstly used for manufacturing the prefabricated piece with the defects, then the prefabricated piece is pasted on the inner wall of the steel tube, and finally concrete is poured to manufacture the test piece.
Description
Technical Field
The invention relates to the technical field of structure detection, in particular to a manufacturing method of a steel pipe concrete void detection test piece.
Background
In recent years, the steel tube concrete is widely applied to super high-rise buildings and large-span bridges, and the section of the steel tube concrete is mainly circular. The steel pipe and the concrete supplement each other, on one hand, the steel pipe is similar to a stirrup, so that the concrete is compressed in three directions, and the pressure resistance is enhanced, and on the other hand, the concrete is filled in the steel pipe to solve the potential instability problem of the steel pipe.
With the increase of concrete filled steel tubes in actual engineering, a plurality of internal concrete and inner surfaces of the steel tubes are found to have gaps, the gap with large thickness is called as void, and the gap with small thickness is generally called as debonding. The arch rib of the concrete-filled steel tube arch bridge is exposed in the field, and is poured by pumping concrete, generally, the concrete can be compactly constructed according to related process standards, but the gap between the concrete and the steel tube cannot be avoided. The main reasons for the void are the dry shrinkage of the concrete in the process of forming the strength, the radial shrinkage of the concrete under the action of temperature in the using process, or the separation of the concrete and the steel pipe caused by the radial expansion of the steel pipe and the like. In building structures, it is primarily this interfacial debonding that results in radial debonding. The void directly affects the combined action of the steel pipe and the concrete, and the influence of the void is not considered in most design specifications at present.
The condition of concrete in the steel tube cannot be observed from the appearance, and attention is paid to how to detect the concrete-filled steel tube void in the actual engineering structure. The existing detection methods mainly comprise an ultrasonic method, a knocking method, a transient impact method, a piezoelectric ceramic method and the like. In order to research the detection effect of various detection methods, mainly for detecting a void area and a void depth, a concrete filled steel tube void detection test piece needs to be manufactured, designed known defects are tested, various detection methods are calibrated and calibrated, and corresponding quantitative methods when various methods are adopted are determined.
It is difficult to produce a specific void defect in the steel tube concrete test piece. At present, a manufacturing method for sticking a foam block on the inner wall of a steel pipe is available, but the existence of the foam block influences the transmission of elastic waves in vibration, and particularly influences the sound amplitude and frequency composition of generated sound when the foam block is knocked on the steel pipe outside a defect. Due to the drying shrinkage of the concrete of the test piece in the strength forming process, the steel pipe and the concrete are frequently debonded outside the set void defect range, and the test result is influenced.
Disclosure of Invention
The application provides a method for manufacturing a steel pipe concrete void detection test piece, and solves the technical problem that the technical difficulty of manufacturing a detection test piece with a specific void defect in the prior art is high.
The application provides a manufacturing method of a steel pipe concrete 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 that of the set defect;
s2: fixing the defect body on the inner wall of a steel pipe, installing a template and a support rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and maintaining the top of the concrete 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, the stay bar, the template and the steel pipe are dismantled, and the defect body is removed to obtain a prefabricated block body; cutting concrete around the defect of the prefabricated block body to enable the defect of the prefabricated block body to have a concrete side wall, and obtaining a prefabricated part;
s4: adhering the prefabricated part to the specified position of the inner wall of the steel pipe;
s5: taking an anti-debonding measure at the end part of the two ends of the steel pipe, and taking a sealing measure at the lower end of the steel pipe;
s6: and pouring concrete in the steel pipe, wherein the upper end of the steel pipe adopts a sealing measure.
In some embodiments, in step S5, the anti-end-debonding measure is that a plurality of bolt holes distributed along the circumference are drilled in the wall of the steel pipe near the two ends, bolts are installed into the steel pipe, each screw has a nut inside and outside the steel pipe, and the two nuts are tightened to fix the corresponding bolt.
In some embodiments, a head of the bolt is disposed within the steel tube.
In some embodiments, the nut on the outer side of the steel pipe is padded with a rubber pad to ensure that the corresponding bolt hole is sealed.
In some embodiments, the bolts at each end of the steel pipe comprise a layer, and the distance from the bolts to the corresponding end of the steel pipe is at least 5 cm.
In some embodiments, the bolts at each end of the steel pipe are in two layers, and the distance between the two layers of bolts is at least 5 cm.
In some embodiments, in step S6, a pad with an outer diameter smaller than the inner diameter of the steel tube is placed over the steel tube, and a weight is placed on the pad.
In some embodiments, the sealing means of the upper and lower ends of the steel pipe is sealing covers, and the joints between the sealing covers and the side walls of the steel pipe are sealed by sealing tapes.
In some embodiments, the sealing cap is made of rubber.
In some embodiments, in step S6, after the prefabricated member is adhered to the inside of the steel pipe, water is sprayed to wet the prefabricated member, after the surface of the prefabricated member is dried, the accumulated water in the steel pipe is drained, and concrete is poured into the steel pipe.
The beneficial effect of this application is as follows:
1. according to the manufacturing method of the test piece for detecting the concrete-filled steel tube void, firstly, a steel tube is used for manufacturing a prefabricated piece containing defects, then the prefabricated piece is pasted on the inner wall of the steel tube, and finally, concrete is poured to manufacture the test piece, so that the method for manufacturing the test piece is high in operability and has no special requirements on the technology of a manufacturer;
2. the concrete and the steel pipe are firmly connected together by adding the bolt connection between the concrete and the steel pipe, so that the debonding is avoided;
3. the backing plate and the balancing weight are placed on the top of the poured concrete, the concrete in the steel pipe is pressurized, the dry shrinkage in the strength forming stage of the concrete can be avoided, the annular tension in the steel pipe can provide 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. the sealing covers are arranged at the two ends of the steel pipe, and the adhesive tapes are adopted, so that the two ends of the steel pipe are prevented from being debonded due to dehydration and drying shrinkage when the concrete is exposed in the air, otherwise, the debonding of the end part of the steel pipe can be rapidly expanded to the whole test piece;
5. the scheme needs less added materials and is low in cost, and the manufacturing difficulty of the test piece is not increased; when the test piece is removed after the test is finished, the concrete at the end part of the test piece is chiseled by the pneumatic pick, the bolt is removed, the steel pipe and the concrete in the steel pipe can be quickly debonded by adopting methods such as knocking or heating, the removal is convenient, other test pieces can be conveniently manufactured 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 used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic vertical cross-sectional view of a center line of a test piece and a void defect in the application;
FIG. 2 is a cross-sectional view of a test piece passing through the center line of a bolt in the present application;
FIG. 3 is an enlarged partial schematic view of the void defect of FIG. 1;
FIG. 4 is a schematic front view of a void defect in the present application (steel tapping pipe not shown);
FIG. 5 is a schematic cross-sectional view of a test piece having an over-void defect according to the present application;
FIG. 6 is a schematic view of a template for making a preform according to the present application;
FIG. 7 is a schematic view of a curing stage of a test piece after concrete pouring in the application.
The method comprises the following steps of 1-steel pipe, 2-concrete, 3-void defect, 4-sealing cover, 6-bolt, 7-sealing adhesive tape, 8-prefabricated part, 9-defect body, 10-template, 11-stay bar, 12-backing plate and 13-balancing weight.
Detailed Description
The embodiment of the application provides a method for manufacturing a test piece for detecting concrete filled steel tube void, which solves the technical problem of high technical difficulty in manufacturing the test piece for detecting specific void defects in the prior art and is shown in figures 1-7.
The steel pipe 1 and the concrete 2 constitute 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 1500 mm; the void defect 3 is located at the middle part of the steel pipe 1, the thickness of the void defect 3 is 5mm, the axial length of the steel pipe 1 is 250mm, and the central angle corresponding to the circumferential direction of the steel pipe 1 is 20 degrees.
The method specifically comprises the following steps:
s1: a defect body 9 having an outer surface with the same shape as the set defect is produced. When the defect body 9 is manufactured, gypsum is tightly 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, the shape of the outer surface of the blank is enabled to be the same as the set defect, and the defect body 9 is obtained. In the polishing process, the size of the side surface in contact with the steel pipe 1 is only corrected, and the size of the side surface in the radius direction is not polished; treating the outer surface of the defect body 9 with a waterproof coating;
s2: fixing the defect body 9 on the inner wall of the steel pipe 1, installing a template 10 and a support 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, and the top of the concrete is flush with the top of the template 10 for maintenance;
s3: after the concrete between the formwork 10 and the inner wall of the steel pipe 1 is formed, the stay bar 11, the formwork 10 and the steel pipe 1 are dismantled, and the defect body 9 is removed to obtain a prefabricated block body; cutting concrete around the defect of the prefabricated block body to enable the concrete side wall to be 5mm around the defect of the prefabricated block body, and obtaining a prefabricated part 8;
s4: adhering the prefabricated part 8 to the designated position of the inner wall of the steel pipe 1, and adopting epoxy resin glue mixed with cement to adhere the prefabricated part 8, so as to ensure confidentiality and air impermeability;
s5: firstly, taking end anti-debonding measures at two ends of the steel pipe 1, drilling a plurality of bolt holes distributed along the circumference on the wall of the steel pipe 1 close to the two ends, wherein the distance between each bolt hole and the corresponding end of the steel pipe 1 is 100mm, the number of the bolt holes is 8, the bolt holes are uniformly distributed, installing bolts 6 in the steel pipe 1, each screw is provided with a nut inside and outside the steel pipe 1, screwing the two nuts to fix the corresponding bolt 6, arranging the bolt head of the bolt 6 in the steel pipe 1, and padding the nut outside the steel pipe 1 with a rubber pad to ensure that the corresponding bolt hole is sealed; sealing measures are adopted at the lower end of the steel pipe 1, the sealing cover 4 is made of rubber, the thickness of the rubber sealing cover 4 is 2mm, and the joint of the sealing cover 4 and the side wall of the steel pipe 1 is sealed by a sealing adhesive tape 7;
s6: concrete is poured into the steel pipe 1, and the upper end of the steel pipe 1 is sealed. After the prefabricated member 8 is adhered to the inside of the steel pipe 1, water is sprayed to enable the prefabricated member 8 to be thoroughly wetted, accumulated water in the steel pipe 1 is discharged after the surface of the prefabricated member 8 is dry, and then concrete 2 is poured into the steel pipe 1. The sealing means of the upper end is the same as in the previous process step. A base plate 12 with the outer diameter smaller than the inner diameter of the steel pipe 1 is arranged above the steel pipe 1, the diameter of the base plate 12 is 600mm, and a balancing weight 13 is arranged on the base plate 12.
After the test of the steel pipe concrete void detection test piece, the steel pipe 1 can be reused. Only the external nut is screwed off, a part of the concrete 2 at the end part is chiseled off, and the bolt 6 is taken out; then, the outer wall of the steel pipe 1 is knocked, heating can be assisted, the concrete 2 and the inner wall of the steel pipe 1 are debonded, and the steel pipe and the concrete can be separated.
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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The manufacturing method of the steel pipe 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 that of the set defect;
s2: fixing the defect body on the inner wall of a steel pipe, installing a template and a support rod in the steel pipe, pouring concrete between the template and the inner wall of the steel pipe, and maintaining the top of the concrete 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, the stay bar, the template and the steel pipe are dismantled, and the defect body is removed to obtain a prefabricated block body; cutting concrete around the defect of the prefabricated block body to enable the defect of the prefabricated block body to have a concrete side wall, and obtaining a prefabricated part;
s4: adhering the prefabricated part to the specified position of the inner wall of the steel pipe;
s5: taking an anti-debonding measure at the end part of the two ends of the steel pipe, and taking a sealing measure at the lower end of the steel pipe;
s6: and pouring concrete in the steel pipe, wherein the upper end of the steel pipe adopts a sealing measure.
2. The method for manufacturing a concrete filled steel tube void test specimen according to claim 1, wherein in step S5, the end anti-debonding measure is that a plurality of bolt holes distributed along the circumference are drilled on the wall of the steel tube near the two ends, bolts are installed into the steel tube, each screw has a nut inside and outside the steel tube, and the two nuts are tightened to fix the corresponding bolt.
3. The method for manufacturing a concrete filled steel tube void test specimen according to claim 2, wherein a bolt head of the bolt is disposed in the steel tube.
4. The method for manufacturing the concrete filled steel tube void detection test piece according to claim 2, wherein a rubber pad is padded on a nut on the outer side of the steel tube to ensure that a corresponding bolt hole is sealed.
5. The method for manufacturing a concrete filled steel tube void test specimen according to claim 2, wherein the bolts at each end of the steel tube form a layer, and the distance from each bolt to the corresponding end of the steel tube is at least 5 cm.
6. The method for manufacturing a concrete filled steel tube void test specimen according to claim 2, wherein the bolts at each end of the steel tube are formed into two layers, and the distance between the two layers of bolts is at least 5 cm.
7. The method for manufacturing the concrete filled steel tube void detection test piece according to claim 1, wherein in step S6, a backing plate with an outer diameter smaller than the inner diameter of the steel tube is placed above the steel tube, and a weight block is placed on the backing plate.
8. The method for manufacturing the concrete filled steel tube void detection test piece according to claim 1, wherein the sealing means for the upper and lower ends of the steel tube is sealing caps, and the joint between the sealing caps and the side wall of the steel tube is sealed by sealing tapes.
9. The method for manufacturing a concrete filled steel tube void test specimen according to claim 8, wherein the sealing cover is made of rubber.
10. The method for manufacturing a concrete filled steel tube void test specimen 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, after the surface of the prefabricated member is dried, accumulated water in the steel tube is drained, 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414344A (en) * | 2022-01-30 | 2022-04-29 | 郑州大学 | Method for testing performance of concrete structural surface in water environment |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114414344A (en) * | 2022-01-30 | 2022-04-29 | 郑州大学 | Method for testing performance of concrete structural surface in water environment |
| CN114414344B (en) * | 2022-01-30 | 2023-10-13 | 郑州大学 | Method for testing performance of concrete structural surface in water environment |
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| CN113640086B (en) | 2023-12-29 |
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