CN214150374U - Corrosion test frame for controlling tensile stress of concrete test piece - Google Patents
Corrosion test frame for controlling tensile stress of concrete test piece Download PDFInfo
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- CN214150374U CN214150374U CN202023009777.4U CN202023009777U CN214150374U CN 214150374 U CN214150374 U CN 214150374U CN 202023009777 U CN202023009777 U CN 202023009777U CN 214150374 U CN214150374 U CN 214150374U
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Abstract
The utility model discloses a control concrete sample tensile stress's corrosion test frame belongs to experiment detection device's technical field. The method comprises the following steps: an upper pressure plate; the lower pressing plate is opposite to the upper pressing plate; round steel with even number; the upper pressing plate and the lower pressing plate are symmetrically arranged between the upper pressing plate and the lower pressing plate; the reinforcing steel bar screw is arranged between the lower pressing plate and the upper pressing plate; the distances between the screw steel bars and each round steel are equal; one group of the metal resistance strain gauge groups is adhered to the round steel, and the other group of the metal resistance strain gauge groups is adhered to the concrete test piece; the metal resistance strain gauge group is electrically connected with the dynamic strain acquisition instrument. The utility model discloses a stretch-draw test or calculation in advance, concrete tensile stress converts the compressive stress of 4 root circle steel depression bars into, through the detection of round steel compressive strain, the tensile stress of regulation control concrete sample.
Description
Technical Field
The utility model belongs to the technical field of experiment detection device, especially, relate to a control concrete test piece tensile stress's corrosion test frame.
Background
At present, the research on the durability of the concrete structure at home and abroad is generally the research on the chemical corrosion durability under the stress-free condition. In practical engineering, concrete is also subjected to a certain tensile stress in a chemically corrosive environment. Under the action of stress, chemical corrosion is intensified, and the corrosion damage of concrete is accelerated. In order to simulate the stress-chemical corrosion coupling action environment for the test, a stress-chemical corrosion coupling test frame for processing a concrete sample is designed.
And when the concrete sample reaches the set concrete stress after being tensioned in the universal testing machine, fixing the nut and releasing the tension of the testing machine. At the moment, the round steel pressure bar of the test frame elastically contracts, and the tensile stress of concrete is reduced. Usually, a strain gauge is attached to the surface of a concrete sample, and the tensile strain value of the concrete is kept the same, thereby ensuring a constant tensile stress (below 40% ultimate tensile strength of the concrete) of the concrete sample.
When the concrete test piece is in a chemical corrosion cycle test, the surface of the concrete is corroded and damaged, the strain gauge cannot receive good protection, and the effect of the strain gauge is failed quickly.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the technical problem who exists among the above-mentioned background art, through calculating, concrete tensile stress converts the compressive stress of 4 root circle steel depression bars into, through the detection that the round steel compressive strain meets an emergency, controls the tensile stress of concrete sample. A metal resistance strain gauge is pasted on the round steel pressure bar and is protected in a sealing mode by epoxy zinc-rich paint, and the tensile stress of the concrete test piece can be monitored and adjusted in the whole process through detection of round steel pressure strain.
To the experimental research of durability under simulation concrete member bears stress-the multiple factor effect of chemical corrosion, the utility model provides a concrete test piece test stand, the tensile stress that can the overall process control, adjust the concrete test piece is provided to the purpose of the utility model.
The utility model adopts the following technical scheme: a corrosion test stand for controlling tensile stress of a concrete specimen, comprising:
an upper pressure plate;
the lower pressing plate is opposite to the upper pressing plate;
round steel with even number; the upper pressing plate and the lower pressing plate are symmetrically arranged between the upper pressing plate and the lower pressing plate;
the reinforcing steel bar screw is arranged between the lower pressing plate and the upper pressing plate; the distances between the reinforcing steel bar screw and each round steel are equal;
one group of the metal resistance strain gauge groups is adhered to the round steel, and the other group of the metal resistance strain gauge groups is adhered to the concrete test piece; the metal resistance strain gauge group is electrically connected with the dynamic strain acquisition instrument;
during testing, the reinforcing steel bar screw is embedded in the concrete sample, and the adjustment of the time pulling force of the concrete is realized by adjusting the position relation between the reinforcing steel bar screw and the upper and lower pressing plates; the concrete tensile stress is converted into the compressive stress of the round steel compression bar, and the tensile stress of the concrete test piece is adjusted and controlled through the detection of the compressive strain of the round steel.
In a further embodiment, an upper reserved hole is formed at the top corner of the upper pressing plate; a lower preformed hole is formed in the vertex angle of the lower pressing plate; the positions and the numbers of the lower preformed holes correspond to those of the upper preformed holes; central preformed holes are formed in the upper pressing plate and the central position of the upper pressing plate;
the central preformed hole is used for installing a reinforcing steel bar screw, and the upper preformed hole and the lower preformed hole are used for installing round steel.
In a further embodiment, the number of the round steel is four, and a metal resistance strain gauge is adhered to the equivalent position of each round steel.
In a further embodiment, two ends of the round steel are turned into screw rods and are fixedly connected with the upper pressing plate and the lower pressing plate which are provided with the upper positioning hole and the lower positioning hole through nuts.
In a further embodiment, the round steel and the metal resistance strain gauge are sealed and protected by epoxy zinc-rich paint.
In a further embodiment, the upper pressure plate and the lower pressure plate are identical in structure, and are made of steel plates 180mm in width and 20mm in thickness.
In a further embodiment, the diameter of the steel bar screw is phi 18mm, and the size of the concrete sample is as follows: 300mm long by 100mm wide by 100mm high.
In a further embodiment, the round bar has the dimensions: 460mm long and phi 25mm in diameter.
The utility model provides a control concrete test piece tensile stress's corrosion test frame, includes top board and the holding down plate that corresponds the setting, coaxial setting at top board and holding down plate test piece locating hole, circumference setting just rather than the same two sets of more than round steel locating holes of hole interval around the test piece locating hole, pass the round steel locating hole and the fixed round steel of spiro union of top board and holding down plate, install the metal resistance foil gage on the round steel, with the dynamic strain collection appearance that the metal resistance foil gage electricity is connected.
In a further embodiment, the number of the round steel positioning holes is three or four, the round steel positioning holes are evenly distributed along the circumferential direction, and the hole spacing between each round steel positioning hole and the test piece positioning hole is equal.
In a further embodiment, the relative position of the metal resistive strain gauges on each round bar is the same.
The utility model has the advantages that:
1. the tensile stress of the concrete sample can be adjusted by embedding a steel bar pull rod and nuts on the upper and lower pressing plates in the concrete.
2. Through the pretension test or calculation in advance, the concrete tensile stress converts the compressive stress of 4 round steel compression bars, and the tensile stress of the concrete test piece is adjusted and controlled through the detection of the compressive strain of the round steel.
3. The test frame and the strain gauge are protected by adopting epoxy zinc-rich paint in a sealing way, so that chemical corrosion damage is prevented, and the tensile stress of the concrete test piece can be monitored and adjusted in the whole process through the detection of the round steel compressive strain.
The utility model discloses a theory of operation:
during testing, a metal resistance strain gauge is adhered to a concrete sample, a reinforcing steel bar screw is embedded in the concrete sample, two ends of the reinforcing steel bar screw respectively penetrate through an upper pressing plate and a lower pressing plate, the concrete sample fixed in a test frame is transferred to a universal testing machine, a clamp clamps the reinforcing steel bar screw to be tensioned, and the strain value of the metal resistance strain gauge on the concrete sample is recorded as epsilon1Fastening the upper and lower pressing plates, and relaxing the tensile force of the universal testing machine; due to the influence of the compression strain of the round steel, the tensile strain value of the concrete is reduced, the tension of the universal testing machine is stretched again, and the upper and lower pressing plates are fastened continuously to ensure that the tensile strain value of the concrete reaches epsilon1(ii) a Repeating for several times to keep the tensile strain value of the concrete constant1(ii) a Simultaneously recording the compression strain value epsilon of the round steel2；
Removing the strain gauge on the surface of the concrete sample, and putting the test stand and the concrete sample into a corrosion cycle test box to carry out a corrosion cycle test; monitoring the compression strain value epsilon of round steel by a dynamic strain acquisition instrument2When strain value ε2Can pass through when changedAnd a lower pressing plate, and timely adjusting.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Each of the labels in fig. 1 is: the device comprises an upper pressing plate 1, a lower pressing plate 2, a metal resistance strain gauge 3, a dynamic strain acquisition instrument 4, a concrete test piece 5, a reinforcing steel bar screw 6, round steel 7 and a nut 8.
Detailed Description
The invention is further described with reference to the following description of the drawings and specific embodiments.
The concrete structure is subjected to the chemical corrosion of the environment and simultaneously bears the tensile stress, and the corrosion damage of the concrete is accelerated. And designing a stress-chemical corrosion coupling test frame for processing the concrete sample for simulating the corrosion environment. The test frame mainly comprises 4 round steel pressure bars, an upper pressure plate and a lower pressure plate, wherein the round steel pressure bars are pasted with metal resistance strain gauges and connected to a dynamic strain acquisition instrument. The test frame and the strain gauge are both protected against corrosion. The test stand is characterized in that the whole process of the concrete corrosion test is under a set tensile stress condition. The concrete tensile stress value is adjusted by embedding a steel bar pull rod in the concrete and nuts on the upper and lower pressing plates, and is controlled in real time by the strain value of the round steel pressing rod.
As shown in FIG. 1, the corrosion test stand for controlling the tensile stress of a concrete sample 5 comprises an upper pressing plate 1, a lower pressing plate 2 and a frame. The frame comprises a plurality of round bars 7. Wherein, the top angle of the upper pressure plate 1 is provided with an upper preformed hole; a lower preformed hole is formed in the vertex angle of the lower pressing plate 2; the lower preformed hole corresponds to the position and the number of the upper preformed hole, in the embodiment, the number of the upper preformed hole and the number of the lower preformed hole are four, and the upper pressing plate 1 and the lower pressing plate 2 start to be arranged at four top corners respectively. Central preformed holes are formed in the central positions of the upper pressing plate 1 and the upper pressing plate 1; the central preformed hole is used for installing a reinforcing steel bar screw 6, and the upper preformed hole and the lower preformed hole are used for installing round steel 7. The upper pressing plate 1 and the lower pressing plate 2 have the same structure and are made of steel plates with the thickness of 180mm, the width of 180mm and the thickness of 20 mm.
The number of the round steel 7 is four, and the round steel 7 is parallel to each other. Two ends of the round steel 7 are turned into screw rods with the diameter of 18mm, and the screw rods are fixedly connected with the upper pressing plate 2 and the lower pressing plate 2 which are provided with the upper positioning hole and the lower positioning hole through M18 nuts 8. The size of the round steel 7 is as follows: 460mm long and phi 25mm in diameter. In order to detect the strain of the round steel 7, 1 metal resistance strain gauge 3 is respectively adhered to the surfaces of the four round steel 7, and the test stand and the strain gauges are sealed and protected by epoxy zinc-rich paint. The metal resistance strain gauge 3 is electrically connected with the dynamic strain acquisition instrument 4.
Before a concrete tension test, a concrete sample 5 which is embedded with a phi 18mm reinforcing steel bar screw 6 and has the length of 300mm, the width of 100mm and the height of 100mm penetrates through the preformed holes of the upper pressing plate and the lower pressing plate 2 through the reinforcing steel bar screw 6 and is connected by an M18 nut 8.
1 metal resistance strain gauge 3 is respectively pasted on two opposite side faces of the concrete sample 5, and is simultaneously connected to the dynamic strain acquisition instrument 4 together with 4 strain gauges on the round steel 7.
Moving the concrete sample 5 fixed on the test stand to a universal tester, clamping the pre-embedded screw of the concrete sample 5 by a clamp, tensioning to a stress value of 40% of concrete tensile strength, and recording a strain value epsilon of a strain gauge on the concrete sample 51. And (3) tightening the M18 nuts 8 of the upper and lower pressing plates 2 and releasing the tensile force of the universal testing machine.
Due to the influence of the compression strain of the round steel 7, the tensile strain value of the concrete is reduced, the tension of the universal testing machine is stretched again, and the M18 nut 8 is fastened continuously, so that the tensile strain value of the concrete reaches epsilon1. Repeating for several times to keep the tensile strain value of the concrete constant1. Simultaneously recording the compression strain value epsilon of the round steel 71。
And removing the surface strain gauge of the concrete test piece 5, and putting the test rack and the concrete test piece 5 into a corrosion cycle test box to carry out a corrosion cycle test. Monitoring the compression strain value epsilon of the round steel 7 by the dynamic strain acquisition instrument 41When strain value ε1When the change occurs, the nut 8 can be adjusted in time through M18.
Through calculation, the concrete tensile stress is converted into the compressive stress of 4 round steel 7 compression bars, and the tensile stress of the concrete sample 5 is controlled through the detection of the compressive strain of the round steel 7. The metal resistance strain gauge 3 is adhered to the round steel 7 pressure bar and is protected in a sealing mode by the epoxy zinc-rich paint, and the tensile stress of the concrete test piece 5 can be monitored and adjusted in the whole process through detection of the round steel 7 pressure strain.
During testing, the reinforcing steel bar screw is embedded in the concrete sample, and the adjustment of the time pulling force of the concrete is realized by adjusting the position relation between the reinforcing steel bar screw and the upper and lower pressing plates; the concrete tensile stress is converted into the compressive stress of the round steel compression bar, and the tensile stress of the concrete test piece is adjusted and controlled through the detection of the compressive strain of the round steel.
The utility model provides a control concrete test piece tensile stress's corrosion test frame, includes top board and the holding down plate that corresponds the setting, coaxial setting at top board and holding down plate test piece locating hole, circumference setting just rather than the same two sets of more than round steel locating holes of hole interval around the test piece locating hole, pass the round steel locating hole and the fixed round steel of spiro union of top board and holding down plate, install the metal resistance foil gage on the round steel, with the dynamic strain collection appearance that the metal resistance foil gage electricity is connected.
Three or four groups of round steel positioning holes are uniformly distributed along the circumferential direction, and the hole intervals of the round steel positioning holes and the test piece positioning holes are equal.
The relative positions of the metal resistance strain gauges on the round steel bars are the same.
Claims (9)
1. The utility model provides a control concrete sample tensile stress's corrosion test frame which characterized in that includes:
an upper pressure plate;
the lower pressing plate is opposite to the upper pressing plate;
round steel with even number; the upper pressing plate and the lower pressing plate are symmetrically arranged between the upper pressing plate and the lower pressing plate;
the reinforcing steel bar screw is arranged between the lower pressing plate and the upper pressing plate; the distances between the reinforcing steel bar screw and each round steel are equal;
one group of the metal resistance strain gauge groups is adhered to the round steel, and the other group of the metal resistance strain gauge groups is adhered to the concrete test piece; the metal resistance strain gauge group is electrically connected with the dynamic strain acquisition instrument;
during testing, the reinforcing steel bar screw is embedded in the concrete sample, and the adjustment of the time pulling force of the concrete is realized by adjusting the position relation between the reinforcing steel bar screw and the upper and lower pressing plates; the concrete tensile stress is converted into the compressive stress of the round steel compression bar, and the tensile stress of the concrete test piece is adjusted and controlled through the detection of the compressive strain of the round steel.
2. The corrosion test stand for controlling the tensile stress of the concrete sample according to claim 1, wherein a reserved hole is formed in the top corner of the upper pressing plate; a lower preformed hole is formed in the vertex angle of the lower pressing plate; the positions and the numbers of the lower preformed holes correspond to those of the upper preformed holes; central preformed holes are formed in the upper pressing plate and the central position of the upper pressing plate;
the central preformed hole is used for installing a reinforcing steel bar screw, and the upper preformed hole and the lower preformed hole are used for installing round steel.
3. The corrosion test stand for controlling the tensile stress of the concrete sample according to claim 1, wherein the number of the round steel is four, and a metal resistance strain gauge is adhered to the equivalent position of each round steel.
4. The corrosion test stand for controlling the tensile stress of the concrete sample as recited in claim 2, wherein two ends of the round steel are turned into screws and are fixedly connected with the upper and lower pressing plates with upper and lower reserved positioning holes through nuts.
5. The corrosion test rack for controlling the tensile stress of the concrete test piece according to claim 1, wherein the round steel and the metal resistance strain gauge are sealed and protected by epoxy zinc-rich paint.
6. The corrosion test stand for controlling the tensile stress of the concrete sample according to claim 1, wherein the upper pressure plate and the lower pressure plate have the same structure, and are made of steel plates with the thickness of 180mm, the width of 180mm and the thickness of 20 mm; the diameter of the steel bar screw is phi 18mm, and the size of the concrete test piece is as follows: 300mm long, 100mm wide and 100mm high; the size of the round steel is as follows: 460mm long and phi 25mm in diameter.
7. The utility model provides a control concrete test piece tensile stress's corrosion test frame, its characterized in that, including top board and the holding down plate that corresponds the setting, coaxial setting is at top board and holding down plate test piece locating hole, and circumference setting just is the same more than two sets of round steel locating holes rather than the hole interval around the test piece locating hole, passes the round steel locating hole of top board and holding down plate and the fixed round steel of spiro union, installs the metal resistance foil gage on the round steel, with the dynamic strain collection appearance that the metal resistance foil gage electricity is connected.
8. The corrosion test rack for controlling the tensile stress of the concrete specimen according to claim 7, wherein the number of the round steel positioning holes is three or four, the round steel positioning holes are evenly distributed along the circumferential direction, and the hole spacing between each round steel positioning hole and the specimen positioning hole is equal.
9. The corrosion test stand for controlling the tensile stress of a concrete specimen according to claim 7, wherein the relative positions of the metal resistance strain gauges on the respective round bars are the same.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023009777.4U CN214150374U (en) | 2020-12-14 | 2020-12-14 | Corrosion test frame for controlling tensile stress of concrete test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023009777.4U CN214150374U (en) | 2020-12-14 | 2020-12-14 | Corrosion test frame for controlling tensile stress of concrete test piece |
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| CN214150374U true CN214150374U (en) | 2021-09-07 |
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| CN202023009777.4U Active CN214150374U (en) | 2020-12-14 | 2020-12-14 | Corrosion test frame for controlling tensile stress of concrete test piece |
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