CN116952719A - Pre-buried channel tensile test device and system - Google Patents
Pre-buried channel tensile test device and system Download PDFInfo
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- CN116952719A CN116952719A CN202310855549.8A CN202310855549A CN116952719A CN 116952719 A CN116952719 A CN 116952719A CN 202310855549 A CN202310855549 A CN 202310855549A CN 116952719 A CN116952719 A CN 116952719A
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- 238000009864 tensile test Methods 0.000 title claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/062—Special adaptations of indicating or recording means with mechanical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0254—Biaxial, the forces being applied along two normal axes of the specimen
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a pre-buried channel tensile test device and a system, wherein the pre-buried channel tensile test device comprises an upper clamping piece and a limiting fixing piece; the upper clamping piece is provided with a top surface and a bottom surface which are opposite, the top surface is used for being connected with the testing machine, a sliding groove is formed in the bottom surface, the top surface is connected with the bottom surface through side surfaces, and scale marks are arranged on one side surface; the upper end of each limiting fixing piece is slidably arranged in the sliding groove, and the lower end of each limiting fixing piece is connected with an embedded groove through an anchor rod. The embedded channel tensile test system comprises the embedded channel tensile test device. The embedded channel tensile test device and the embedded channel tensile test system are connected with the test machine through the upper clamping piece, the sliding groove is utilized to connect the limiting fixing piece and adjust the relative position between the upper clamping piece and the limiting fixing piece, and the scale mark on the upper clamping piece is used for accurately adjusting the relative position among the test machine, the upper clamping piece and the limiting fixing piece, so that the test accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of pre-buried channel tensile tests, and particularly relates to a pre-buried channel tensile test device and system.
Background
The embedded channel is special-purpose section steel embedded in the tunnel lining and used for fixing the overhead contact system hanging columns, the additional wire support and other equipment. According to the standard requirement of TB/T3329-2013 embedded channel in an electrified railway contact network tunnel, a tensile test is required to be carried out after the embedded channel and a T-shaped bolt are connected, and the tensile strength of an 8.8-level T-shaped bolt and the bearing and stretching capacity of the channel are used for detecting the integral bearing capacity of the embedded channel, so that the method has very important significance for tunnel operation safety.
In the prior art, the existing detection equipment detection items are mainly subjected to the integral installation tensile test of the embedded channel, the test equipment is huge, the installation is complex, the test items are more, the efficiency is lower, the test result is greatly influenced by the installation effect of the embedded channel, and the result is unstable.
Disclosure of Invention
The invention aims to provide a pre-buried channel tensile test device and a pre-buried channel tensile test system, which are used for solving the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the invention provides a pre-buried channel tensile test device, which comprises an upper clamping piece and a limiting fixing piece;
the upper clamping piece is provided with a top surface and a bottom surface which are opposite, the top surface is used for being connected with the testing machine, a sliding groove is formed in the bottom surface, the top surface is connected with the bottom surface through side surfaces, and scale marks are arranged on one side surface;
the limiting fixing pieces are arranged in two, the upper end of each limiting fixing piece is arranged in the sliding groove in a sliding mode, the lower end of each limiting fixing piece is connected with an embedded groove through an anchor rod, correspondingly, the top surface of each embedded groove is connected with the limiting fixing piece through the anchor rod, and the bottom surface of each embedded groove is connected with a T-shaped bolt.
In one possible design, the upper clamping member comprises an upper fixing member and a clamping rod, wherein the upper fixing member is provided with a plurality of outer surfaces, the clamping rod is fixed on the top surface of the upper fixing member, the sliding groove is arranged on the bottom surface of the upper fixing member, and the scale marks are fixed on the side surface of the upper fixing member; correspondingly, the upper fixing piece is connected with the testing machine through the clamping rod.
In one possible design, the sliding groove is configured as a T-shaped groove, and the side surface of the upper fixing piece is embedded with a scale, and the scale mark is arranged on the scale.
In one possible design, the limit fixing piece comprises a base and a sliding part, the sliding part is arranged on the top surface of the base, the bottom surface of the base is provided with a clamping groove extending into the base, and correspondingly, the upper end of the anchor rod is adapted to the clamping groove and is connected with the base through the clamping groove.
In one possible design, the upper clamping piece, the limiting fixing piece, the embedded channel and the anchor rod are all made of 16 # manganese steel.
In a second aspect, the invention provides a pre-buried channel tensile test system, which comprises a tester and the pre-buried channel tensile test device, wherein the tester is connected with the pre-buried channel tensile test device through an upper clamping piece.
The beneficial effects are that:
the embedded channel tensile test device and the embedded channel tensile test system are connected with the test machine through the upper clamping piece so that the test machine can apply acting force for testing; meanwhile, the sliding groove is utilized to connect the limiting fixing piece, so that on one hand, the upper clamping piece and the limiting fixing piece are connected, acting force is conveniently transmitted to the embedded groove, on the other hand, the relative position between the upper clamping piece and the limiting fixing piece can be adjusted, and the scale mark on the upper clamping piece is used for accurately adjusting the relative position between the testing machine and the upper clamping piece and the limiting fixing piece, so that the accuracy of the test is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pre-buried channel tensile test device.
Fig. 2 is a schematic front view of fig. 1.
In the figure:
100. an upper clamping member; 11. an upper fixing member; 12. a clamping rod; 101. a sliding groove; 102. scale marks; 103. a ruler; 200. a limit fixing piece; 201. a base; 202. a clamping groove; 300. a bolt; 400. pre-burying a channel; 500. t-shaped bolts.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention.
Examples:
as shown in fig. 1 and 2, a pre-buried channel tensile test device includes an upper clamping member 100 and a limiting fixing member 200;
the upper clamping piece 100 is provided with a top surface and a bottom surface which are opposite, the top surface is used for being connected with a testing machine, a sliding groove 101 is formed in the bottom surface, the top surface is connected with the bottom surface through side surfaces, and scale marks 102 are formed in one side surface;
the limiting fixing pieces 200 are arranged in two, the upper end of each limiting fixing piece 200 is slidably arranged in the sliding groove 101, the lower end of each limiting fixing piece is connected with the embedded groove 400 through the anchor rod 300, correspondingly, the top surface of each embedded groove 400 is connected with the limiting fixing piece 200 through the anchor rod 300, and the bottom surface of each embedded groove 400 is connected with the T-shaped bolt 500.
In the pre-buried channel tensile test device, the upper clamping piece 100 is connected with a testing machine so that the testing machine applies an acting force for testing; meanwhile, the sliding groove 101 is used for connecting the limiting fixing piece 200, so that on one hand, the upper clamping piece 100 and the limiting fixing piece 200 are connected so as to conveniently transmit acting force to the embedded groove 400, on the other hand, the relative position between the upper clamping piece 100 and the limiting fixing piece 200 can be adjusted, and on the other hand, the scale marks 102 on the upper clamping piece 100 are used for assisting in accurately adjusting the relative positions among the testing machine, the upper clamping piece 100 and the limiting fixing piece 200, so that the accuracy of the test is improved.
Further, the pre-buried channel tensile test device can accomplish monoaxial tensile test and biax tensile test simultaneously, specifically:
when a uniaxial tensile test is performed, the acting force applied by the testing machine acts on the embedded channel 400 through the upper clamping piece 100, one of the limiting fixing pieces 200 and the corresponding anchor rod 300, and at this time, an important factor affecting the tensile test result is whether the axis of the testing machine is consistent with the axis of the anchor rod 300, so that the eccentric tensile effect on the test result is avoided. When a uniaxial tensile test is performed, the relative position between the upper clamping piece 100 and the limiting fixing piece 200 is adjusted through the sliding groove 101, so that the axis of the anchor rod 300 is consistent with that of the testing machine, and meanwhile, the scale marks 102 on the upper clamping piece 100 are used for measuring, so that the accuracy of acting force transmission is ensured, eccentric tension is avoided, and the accuracy of a test result is improved.
When a biaxial tensile test is performed, the position of the upper clamping piece 100 is adjusted so that the axis of the testing machine is equidistant and parallel to the axes of the two anchor rods 300, and the acting force applied by the testing machine uniformly acts on the two limiting fixing pieces 200 through the clamping piece, and then uniformly acts on the embedded channel 400 through the two anchor rods 300. In addition, according to the standard requirement of TB/T3329-2013 embedded channel 400 in the tunnel of the overhead contact system of the electrified railway, the distance between the centers of the two anchor rods 300 is 250 mm, the measurement is carried out through the scale marks 102 on the upper clamping piece 100, the test is started when the requirements are met, and the adjustment is carried out when the requirements are not met.
Based on the above, the bearing capacity test of the embedded channel 400 is completed by the embedded channel tensile test device, so as to measure the mechanical properties of the embedded channel 400, and ensure that the properties of the embedded channel 400 meet the design and use requirements. Meanwhile, the embedded channel tensile test device has various test forms, so that the richness and the comprehensiveness of the test are improved, and the obtained test result is more accurate.
Further, the static bearing capacity test of the T-shaped bolt 500 can be performed by the embedded channel tensile test device. The application range of the embedded channel tensile test device is effectively widened, and the practicability is effectively improved.
In operation, the testing machine is connected to the top surface of the upper clamping member 100, and the two limiting fixing members 200 slide along the sliding grooves 101 respectively, so that the two limiting fixing members 200 are connected with the two anchor rods 300 respectively. When the uniaxial tensile test is performed, the position of the upper clamping piece 100 is adjusted again so that the axis of the testing machine is consistent with the axis of the corresponding anchor rod 300, and then the testing machine is started to load acting force. When the biaxial tension test is performed, the position of the upper clamping piece 100 is adjusted so that the axis of the testing machine is equidistant and parallel to the axes of the two anchor rods 300, and then the testing machine is started to load the acting force.
After the bearing capacity test of the embedded channel 400 is completed, the model of the testing machine is replaced, the axis of the testing machine is adjusted to be consistent with the axis of the T-shaped bolt 500, and the static bearing capacity test of the T-shaped bolt 500 is carried out through the embedded channel tensile testing device.
In the present embodiment, the upper clamping member 100 includes an upper fixing member 11 and a clamping lever 12, wherein the upper fixing member 11 has a plurality of outer surfaces, the clamping lever 12 is fixed on the top surface of the upper fixing member 11, the sliding groove 101 is provided on the bottom surface of the upper fixing member 11, and the scale line 102 is fixed on the side surface of the upper fixing member 11; correspondingly, the upper fixing member 11 is connected to the testing machine through a clamping rod 12.
Based on the design scheme, the upper fixing piece 11 is constructed as a steel bar, has a simple structure and good structural strength, so that the service life is prolonged; meanwhile, the steel bar has a plurality of outer surfaces so as to perform different processing on different outer surfaces, and the upper fixing member 11 is conveniently connected with the clamping rod 12, the scale marks 102 and the limit fixing member 200. The clamping rod 12 is used for connecting a tester, so the clamping rod 12 is selected according to the model of the tester used to ensure the connecting effect.
As shown in fig. 1, the slide groove 101 is configured as a T-shaped groove. Based on the above design, the T-shaped groove can be abutted with the limit fixing member 200, and on the basis of realizing the sliding function, connection and limitation are realized, so that the limit fixing member 200 is prevented from being separated from the sliding groove 101 due to gravity. Meanwhile, the structure is effectively simplified, additional equipment between the upper fixing piece 11 and the limiting fixing piece 200 is reduced, and the use cost is reduced.
In one possible implementation, the side surface of the upper fixing member 11 is embedded with a scale 103, and the scale mark 102 is arranged on the scale 103. Based on the above design scheme, the corresponding groove is machined on the upper fixing piece 11, the scale 103 is embedded in the groove, the scale mark 102 is not required to be machined on the upper fixing piece 11, and the machining cost is reduced.
In this embodiment, the limiting fixing piece 200 includes a base 201 and a sliding portion, the sliding portion (not shown) is disposed on the top surface of the base 201, the bottom surface of the base 201 is provided with a clamping groove 202 extending into the base 201, and correspondingly, the upper end of the anchor rod 300 is adapted to the clamping groove 202 and is connected to the base 201 through the clamping groove 202.
Based on the above design, the base 201 may be configured into any suitable shape to adapt to different use environments, and expand the application range. The sliding portion is used to connect the sliding groove 101, and then the sliding portion may be configured to be arbitrarily adapted to the shape of the sliding groove 101 to ensure connection therebetween. Similarly, the shape of the clamping groove 202 is also adapted to the anchor rod 300 used; and optionally, as shown in fig. 1, when the upper end of the anchor rod 300 is configured as a T-shape, the snap-fit groove 202 is configured as an adapted T-shape groove.
In one possible implementation, the upper clamping member 100, the limiting fixing member 200, the pre-buried channel 400 and the anchor 300 are all made of 16 # manganese steel. Based on the design scheme, the anti-damage, impact-bearing, extrusion and wear-resistant performances of all parts in the embedded channel tensile test device are improved, and other suitable steels can be selected easily.
The embodiment introduces a pre-buried channel tensile test system on the basis of the pre-buried channel tensile test device, wherein the pre-buried channel tensile test system comprises a test machine and the pre-buried channel tensile test device, and the test machine is connected with the pre-buried channel tensile test device through an upper clamping piece 100.
Based on the design scheme, the embedded channel tensile test system can be any suitable model of testing machine, so that the testing requirements under different conditions can be met, the application range of the embedded channel tensile test system is improved, and the practicability is improved.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The embedded channel tensile test device is characterized by comprising an upper clamping piece (100) and a limiting fixing piece (200);
the upper clamping piece (100) is provided with a top surface and a bottom surface which are opposite, the top surface is used for being connected with the testing machine, a sliding groove (101) is formed in the bottom surface, the top surface is connected with the bottom surface through side surfaces, and scale marks (102) are formed in one side surface;
the limiting fixing pieces (200) are arranged in two, the upper ends of each limiting fixing piece (200) are slidably arranged in the sliding groove (101), the lower ends of the limiting fixing pieces are connected with the embedded groove (400) through the anchor rods (300), correspondingly, the top surfaces of the embedded groove (400) are connected with the limiting fixing pieces (200) through the anchor rods (300), and the bottom surfaces of the embedded groove (400) are connected with T-shaped bolts (500).
2. The pre-buried channel tensile test device according to claim 1, characterized in that the upper clamping member (100) comprises an upper fixing member (11) and a clamping rod (12), wherein the upper fixing member (11) has a plurality of outer surfaces, the clamping rod (12) is fixed on the top surface of the upper fixing member (11), the sliding groove (101) is arranged on the bottom surface of the upper fixing member (11), and the graduation marks (102) are fixed on the side surface of the upper fixing member (11); correspondingly, the upper fixing piece (11) is connected with the testing machine through the clamping rod (12).
3. The embedded channel tensile test device according to claim 1 or 2, characterized in that the sliding groove (101) is constructed as a T-shaped groove, a scale (103) is embedded on the side surface of the upper fixing piece (11), and the scale mark (102) is arranged on the scale (103).
4. The embedded channel tensile test device according to claim 1, wherein the limiting fixing piece (200) comprises a base (201) and a sliding part, the sliding part is arranged on the top surface of the base (201), a clamping groove (202) extending into the base (201) is formed in the bottom surface of the base (201), and correspondingly, the upper end of the anchor rod (300) is adapted to the clamping groove (202) and is connected with the base (201) through the clamping groove (202).
5. The pre-buried channel tensile testing apparatus according to any one of claims 1 to 4, wherein the upper clamping member (100), the limiting fixing member (200), the pre-buried channel (400) and the anchor rod (300) are all made of 16 # manganese steel.
6. A pre-buried channel tensile test system, characterized by comprising a testing machine and the pre-buried channel tensile test device according to any one of claims 1-5, wherein the testing machine is connected with the pre-buried channel tensile test device through an upper clamping piece (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310855549.8A CN116952719A (en) | 2023-07-12 | 2023-07-12 | Pre-buried channel tensile test device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310855549.8A CN116952719A (en) | 2023-07-12 | 2023-07-12 | Pre-buried channel tensile test device and system |
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| Publication Number | Publication Date |
|---|---|
| CN116952719A true CN116952719A (en) | 2023-10-27 |
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| CN202310855549.8A Pending CN116952719A (en) | 2023-07-12 | 2023-07-12 | Pre-buried channel tensile test device and system |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001337016A (en) * | 2000-05-29 | 2001-12-07 | Ishikawajima Harima Heavy Ind Co Ltd | Dovetail fixing structure of tensile tester |
| CN103837415A (en) * | 2014-02-21 | 2014-06-04 | 河海大学 | Pressure, rotation and tension fatigue tester |
| CN207570908U (en) * | 2017-09-19 | 2018-07-03 | 湖北省建筑科学研究设计院 | A kind of double anchor tensile testing systems |
| CN208432458U (en) * | 2018-06-20 | 2019-01-25 | 绍兴中纺联检验技术服务有限公司 | A kind of textile strength detection device |
| CN109946151A (en) * | 2019-03-11 | 2019-06-28 | 江苏城工建设科技有限公司 | A kind of stretching detection combination device for pre-buried channel flow |
| CN211904920U (en) * | 2020-02-17 | 2020-11-10 | 上海台硕检测仪器有限公司 | Novel tensile bending test machine |
| CN113484136A (en) * | 2021-07-13 | 2021-10-08 | 福建省建研工程检测有限公司 | Special fixture for pre-buried channel load test |
| CN113607548A (en) * | 2021-01-14 | 2021-11-05 | 江苏省建筑工程质量检测中心有限公司 | Channel body tensile strength mechanical test tool and application thereof |
-
2023
- 2023-07-12 CN CN202310855549.8A patent/CN116952719A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001337016A (en) * | 2000-05-29 | 2001-12-07 | Ishikawajima Harima Heavy Ind Co Ltd | Dovetail fixing structure of tensile tester |
| CN103837415A (en) * | 2014-02-21 | 2014-06-04 | 河海大学 | Pressure, rotation and tension fatigue tester |
| CN207570908U (en) * | 2017-09-19 | 2018-07-03 | 湖北省建筑科学研究设计院 | A kind of double anchor tensile testing systems |
| CN208432458U (en) * | 2018-06-20 | 2019-01-25 | 绍兴中纺联检验技术服务有限公司 | A kind of textile strength detection device |
| CN109946151A (en) * | 2019-03-11 | 2019-06-28 | 江苏城工建设科技有限公司 | A kind of stretching detection combination device for pre-buried channel flow |
| CN211904920U (en) * | 2020-02-17 | 2020-11-10 | 上海台硕检测仪器有限公司 | Novel tensile bending test machine |
| CN113607548A (en) * | 2021-01-14 | 2021-11-05 | 江苏省建筑工程质量检测中心有限公司 | Channel body tensile strength mechanical test tool and application thereof |
| CN113484136A (en) * | 2021-07-13 | 2021-10-08 | 福建省建研工程检测有限公司 | Special fixture for pre-buried channel load test |
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