CN211904513U - Concrete triaxial stress measuring device - Google Patents
Concrete triaxial stress measuring device Download PDFInfo
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- CN211904513U CN211904513U CN202020992801.1U CN202020992801U CN211904513U CN 211904513 U CN211904513 U CN 211904513U CN 202020992801 U CN202020992801 U CN 202020992801U CN 211904513 U CN211904513 U CN 211904513U
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Abstract
The utility model relates to a concrete triaxial stress measuring device, which comprises a concrete outer protective layer and a triaxial stress measuring body, wherein the triaxial stress measuring body is positioned in the concrete outer protective layer; the triaxial stress measuring body comprises a triaxial steel bar framework, three concrete cushion blocks and three flexible film pressure sensors, the triaxial steel bar framework comprises three steel bars which are mutually vertical, one ends of the three steel bars are welded together, and the other ends of the three steel bars are respectively and vertically provided with one concrete cushion block; the bottom face of concrete cushion with reinforcing bar fixed connection sets up one on the face of top flexible film pressure sensor, flexible film pressure sensor's wiring end connecting wire, the wire draw to the outside of concrete outer protective layer, the utility model provides a do not have the technical problem who measures the inside accurate stress state of concrete effectively among the prior art yet.
Description
Technical Field
The utility model relates to a civil engineering monitoring application technology field, in particular to concrete triaxial stress measuring device.
Background
The stress state of a concrete structure is an important parameter reflecting the safety of the concrete structure, so that the stress measurement of the concrete structure is important in the experimental research and the field monitoring of a concrete structure model. At present, no device for effectively measuring the accurate stress state in the concrete exists, and a device for adhering a resistance strain gauge on the surface of a concrete structure is generally adopted to measure the surface strain, and the stress on the surface of the concrete is obtained through conversion of the estimated elastic modulus of a concrete material. Since concrete is a non-mean material, there is usually a certain difference between the theoretical analysis result and the test result at the inner level.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a concrete triaxial stress measuring device to solve the technical problem who has not measured the inside accurate stress state's of concrete effectively device among the prior art yet.
In order to solve the problems, the utility model provides a concrete triaxial stress measuring device, which comprises a concrete outer protective layer and a triaxial stress measuring body, wherein the triaxial stress measuring body is positioned in the concrete outer protective layer;
the triaxial stress measuring body comprises a triaxial steel bar framework, three concrete cushion blocks and three flexible film pressure sensors, the triaxial steel bar framework comprises three steel bars which are mutually vertical, one ends of the three steel bars are welded together, and the other ends of the three steel bars are respectively and vertically provided with one concrete cushion block; the bottom end face of the concrete cushion block is fixedly connected with the reinforcing steel bar, the top end face of the concrete cushion block is provided with the flexible film pressure sensor, a wiring end of the flexible film pressure sensor is connected with a lead, and the lead is led out to the outside of the concrete outer protective layer.
Preferably, any two of the concrete pads are perpendicular to each other, the concrete pads are perpendicular to the steel bars on which the concrete pads are arranged, and the top end faces of the concrete pads face away from the steel bars.
Preferably, the concrete outer protective layer is of a cubic structure, and the triaxial stress measuring body is located in the center of the concrete outer protective layer.
Preferably, the concrete cushion block and the concrete outer protection layer are both made of C55 concrete.
Preferably, the concrete cushion block is a square block, the end of the steel bar is adhered to the center of the bottom end face of the concrete cushion block through epoxy resin, and the flexible film pressure sensor is adhered to the center of the top end face of the concrete cushion block through epoxy resin.
Preferably, the periphery of the flexible film pressure sensor is coated with epoxy resin with a waterproof function.
Preferably, the joint of the wiring end of the flexible film pressure sensor and the lead is coated with waterproof silica gel.
Compared with the prior art, the utility model discloses there are following technological effect:
the utility model relates to a nondestructive monitoring, when needs are measured and are constructed internal stress, with concrete triaxial stress measuring device bury the object that awaits measuring inside, can measure the size of the inside triaxial stress of object that awaits measuring, provide certain data support to monitoring and research, facilitate for the construction. The utility model discloses a research of concrete structure non-linear atress action provides the foundation, has very important meaning.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a concrete triaxial stress measuring apparatus according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a triaxial stress measuring body according to a preferred embodiment of the present invention.
Detailed Description
The present invention provides a concrete triaxial stress measuring device, which will be described in detail with reference to fig. 1 and 2, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed embodiment and a specific operation process are given, however, the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the concrete triaxial stress measuring device without changing the spirit and content of the present invention.
Referring to fig. 1 and 2, a triaxial stress measuring apparatus for concrete includes a concrete outer protective layer 1 and a triaxial stress measuring body 2, wherein the triaxial stress measuring body 2 is located in the concrete outer protective layer 1;
the triaxial stress measuring body 2 comprises a triaxial steel reinforcement framework 21, three concrete cushion blocks 22 and three flexible film pressure sensors 23, wherein the triaxial steel reinforcement framework 21 comprises three mutually perpendicular steel reinforcements 211, one ends of the three steel reinforcements 211 are welded together, and the other ends of the three steel reinforcements are respectively and vertically provided with one concrete cushion block 22; the bottom end face of the concrete cushion block 22 is fixedly connected with the reinforcing steel bars 211, the flexible film pressure sensor 23 is arranged on the top end face, a wiring end 231 of the flexible film pressure sensor 23 is connected with a lead, and the lead is led out to the outside of the concrete outer protective layer 1.
In this embodiment, any two concrete pads 22 are perpendicular to each other, and preferably, the concrete pads 22 are square blocks, the concrete pads 22 are perpendicular to the steel bars 211 where the concrete pads are located, the bottom end surfaces of the concrete pads 22 are surfaces connected to the steel bars 211, and the top end surfaces are surfaces facing away from the steel bars 211.
In this embodiment, three mutually perpendicular reinforcing bars 211 have the same size, three concrete pads 22 have the same size, and the flexible film pressure sensor 23 is correspondingly laid on the top end surface of one concrete pad 22. Preferably, the bottom and top faces of the concrete pad 22 are square, such as 20mm by 5mm in length and width of the concrete pad 22. The size of the flexible film pressure sensor 23 is not larger than that of the top end face of the concrete cushion block 22, the flexible film pressure sensor 23 is located in the center of the top end face of the concrete cushion block 22, and preferably, the size of the flexible film pressure sensor 23 is 20mm by 20 mm.
Further, the concrete outer protection layer 1 is of a cubic structure, the concrete outer protection layer 1 completely wraps the triaxial stress measuring body 2, and preferably, the triaxial stress measuring body 2 is located in the center of the concrete outer protection layer 1.
The concrete cushion block 22 and the concrete outer protection layer 1 are both made of C55 concrete.
The outer end of the steel bar 211 is adhered to the center of the bottom end surface of the concrete pad 22 by epoxy resin, and the flexible film pressure sensor 23 is adhered to the top end surface of the concrete pad 22 by epoxy resin. The outer periphery of the flexible film pressure sensor 23 is coated with epoxy resin having a waterproof function in order to increase the waterproofness of the flexible film pressure sensor 23. The joint of the terminal 231 of the flexible film pressure sensor 23 and the lead is coated with silica gel with waterproof function.
The utility model also provides a concrete triaxial stress measuring device's manufacturing method, specifically include several following steps:
s1, welding one ends of three mutually perpendicular reinforcing steel bars 211 together to form a triaxial reinforcing steel bar framework 21;
s2, vertically and fixedly arranging a concrete cushion block 22 at the outer end part of each steel bar 211 through epoxy resin, fixedly arranging a flexible film pressure sensor 23 on the outer end face of each concrete cushion block 22 through epoxy resin, and coating epoxy resin with a waterproof effect on the periphery of the flexible film pressure sensor 23; the terminal 231 of the flexible film pressure sensor 23 is connected with a lead, and the terminal 231 is coated with silica gel to be waterproof, so that the lead is prevented from being influenced by water inflow, and at the moment, the manufacture of the triaxial stress measuring body 2 is completed;
s3, placing the manufactured triaxial stress measurement body 2 into a standard cube mold, and righting the position of the triaxial stress measurement body 2 to enable the triaxial stress measurement body to be positioned at the center of the cube mold;
s4, pouring concrete of the C55 type into the cube mold to manufacture the concrete outer protection layer 1, taking out and curing the concrete outer protection layer 1 after the concrete outer protection layer 1 is solidified, and finishing the manufacturing of the measuring device after the curing is finished.
The utility model also provides a concrete triaxial stress's measuring method adopts foretell measuring device, and concrete measuring method is: when the measured construction is poured, the measuring device is placed in the construction for pouring, the resistance of the flexible film pressure sensor 23 is measured after the construction is solidified, the triaxial pressure in the concrete member can be known according to the linear relation between the sensor pressure and the resistance, and the measurement of the internal stress of the member is completed. In this embodiment, the surface of the flexible film pressure sensor 23 deforms when receiving pressure, the internal resistance changes, and the pressure inside the receiving device (which is connected to the flexible film pressure sensor 23 through a wire) is converted according to the relationship between the force and the resistance to obtain the pressure.
Claims (7)
1. A concrete triaxial stress measuring device is characterized by comprising a concrete outer protective layer and a triaxial stress measuring body, wherein the triaxial stress measuring body is positioned in the concrete outer protective layer;
the triaxial stress measuring body comprises a triaxial steel bar framework, three concrete cushion blocks and three flexible film pressure sensors, the triaxial steel bar framework comprises three steel bars which are mutually vertical, one ends of the three steel bars are welded together, and the other ends of the three steel bars are respectively and vertically provided with one concrete cushion block; the bottom end face of the concrete cushion block is fixedly connected with the reinforcing steel bar, the top end face of the concrete cushion block is provided with the flexible film pressure sensor, a wiring end of the flexible film pressure sensor is connected with a lead, and the lead is led out to the outside of the concrete outer protective layer.
2. The concrete triaxial stress measuring apparatus of claim 1, wherein any two of said concrete pads are perpendicular to the reinforcing bars on which they are located, and their top end faces are opposite to the reinforcing bars.
3. The concrete triaxial stress measuring apparatus of claim 1, wherein the concrete outer protective layer has a cubic structure, and the triaxial stress measuring body is located at the center of the concrete outer protective layer.
4. The concrete triaxial stress measuring apparatus of claim 1, wherein the concrete pad and the outer concrete layer are made of C55 concrete.
5. The concrete triaxial stress measuring apparatus of claim 1, wherein the concrete pad is a square block, the end portion of the reinforcing bar is attached to the center of the bottom end surface of the concrete pad by epoxy resin, and the flexible film pressure sensor is attached to the center of the top end surface of the concrete pad by epoxy resin.
6. The concrete triaxial stress measuring apparatus of claim 1, wherein the flexible film pressure sensor is coated with a waterproof epoxy resin on its outer periphery.
7. The concrete triaxial stress measuring device as claimed in claim 1, wherein the junction of the terminal of the flexible thin film pressure sensor and the lead is coated with a waterproof silicone rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020992801.1U CN211904513U (en) | 2020-06-03 | 2020-06-03 | Concrete triaxial stress measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020992801.1U CN211904513U (en) | 2020-06-03 | 2020-06-03 | Concrete triaxial stress measuring device |
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| CN211904513U true CN211904513U (en) | 2020-11-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556891A (en) * | 2020-11-20 | 2021-03-26 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
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2020
- 2020-06-03 CN CN202020992801.1U patent/CN211904513U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556891A (en) * | 2020-11-20 | 2021-03-26 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
| CN112556891B (en) * | 2020-11-20 | 2021-08-17 | 中国水利水电科学研究院 | Concrete whole life period internal stress state monitoring device based on film type sensor |
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