A method for testing the bearing capacity of a reinforcing steel bar connecting joint in situ

Abstract

This invention relates to the technical field of rebar connection joint testing methods, specifically disclosing an in-situ on-site testing method for the bearing capacity of rebar connection joints, comprising the following steps: Step S001: Fix the rebars at both ends of the rebar connection joint to be tested, determine the location of the rebar connection joint to be tested, and clean the attachments on the two adjacent rebar sections of the rebar connection joint; Step S002: Fix the spliced ​​testing device from both sides to the outside of the rebar connection joint to be tested and the adjacent rebars; Step S003: Fix the sleeve on the rebars on both sides of the testing device, and embed the clamp between the sleeve and the rebar; Step S004: Start the testing device to push the sleeve to gradually stretch the rebars at both ends of the rebar connection joint; Step S005: Record the pressure sensor values ​​and changes in values ​​during the test, thereby obtaining the bearing capacity characteristics of the rebar connection joint. This method solves the problems of low testing efficiency, poor traceability, and difficulty in ensuring authenticity in traditional random sampling of specimens for testing the quality of mechanical connection joints.

Description

Technical Field

[0001] This application relates to the technical field of testing methods for steel bar connection joints, and specifically discloses an in-situ test method for the bearing capacity of steel bar connection joints. Background Technology

[0002] Reinforced concrete structures are one of the most commonly used structural forms in modern buildings. Modern reinforced concrete components are often tens or even hundreds of meters long, while the length of steel bars produced by steel companies is limited, necessitating splicing of the bars during on-site construction. Among these methods, mechanical splicing technology for steel bars offers high reliability, wide applicability, simple and fast on-site construction, and no fire hazard, making it the most widely used form of steel bar joint in current engineering projects.

[0003] The construction of mechanical rebar splices is a crucial step in the quality control of rebar sub-projects, and its quality has a significant impact on the safety of reinforced concrete structures, making it one of the key focuses of reinforced concrete structure quality control. The quality of mechanical rebar splices is affected by many factors, including raw materials, processing parameters, and construction quality. Industry standards have compiled a series of quality control measures, including material arrival acceptance, type inspection, process inspection, and in-process inspection. Furthermore, random specimens are taken from the completed structure to conduct ultimate compressive strength tests for the final quality inspection of the mechanical rebar splices.

[0004] The method of randomly selecting test pieces from engineering structures to inspect the quality of mechanical connection joints is essentially on-site witnessed sampling and testing, which fails to fully realize on-site inspection, resulting in low testing efficiency, poor traceability, and difficulty in ensuring authenticity.

[0005] On-site sampling and testing is the final assessment of the quality of mechanical rebar joints, directly affecting the structural quality of the project. Current standards require sampling by inspection batch and then sending the samples to a testing unit for testing under the supervision of the supervising engineer. Ultimately, this is sample delivery testing, not true on-site testing. The authenticity of specimens taken on-site is difficult to guarantee during the sample delivery process. Furthermore, even if the test results are satisfactory, the sampling location still needs to be repaired, resulting in significant time delays, low efficiency, and project delays. Therefore, the inventors have provided an on-site in-situ testing method for the bearing capacity of rebar joints to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of low testing efficiency, poor traceability, and difficulty in ensuring authenticity in traditional random sampling of test specimens for inspecting the quality of mechanical connection joints.

[0007] To achieve the above objectives, the basic solution of the present invention provides a method for in-situ testing of the bearing capacity of steel bar connection joints, comprising the following steps:

[0008] Step S001: Fix the steel bars at both ends of the steel bar connector to be tested, determine the location of the steel bar connector, and clean the attachments on the steel bars of the two adjacent sections of the steel bar connector.

[0009] Step S002: Fix the splicing test device from both sides to the outside of the rebar connection joint to be tested and the rebar adjacent to the rebar connection joint;

[0010] Step S003: Fix the spliced ​​sleeve on the outer steel bars at both ends of the spliced ​​test device, insert a clip between the inner side of the sleeve and the steel bar to fix the sleeve and the steel bar, and fix a pressure sensor that can be squeezed by the spliced ​​test device on the inner side of the sleeve.

[0011] Step S004: Start the splicing test device and push the sleeve to gradually stretch the steel bars at both ends of the steel bar connection joint outward;

[0012] Step S005: Record the pressure sensor values ​​and changes in values ​​under test conditions, thereby obtaining the load-bearing capacity characteristics of the rebar connection joint.

[0013] The basic solution of the present invention also provides a splicing test device for performing the above-described method.

[0014] Furthermore, the invention includes a through-hole jack, characterized in that: the through-hole jack includes a detachably connected left half jack and a right half jack, and the left half jack and the right half jack are respectively provided with hydraulic structures that can be attached to each other and used to stretch the reinforcing bars at both ends; when the hydraulic structures in the left half jack and the right half jack are spliced, they are coaxially provided with through-holes for the reinforcing bars and mechanical connectors to pass through.

[0015] The basic solution of this invention also provides a method for in-situ testing of the bearing capacity of steel bar connection joints based on a splicing testing device, comprising the following steps:

[0016] Step S001: Fix the steel bars at both ends of the steel bar connector to be tested, determine the location of the steel bar connector, and clean the attachments on the steel bars of the two adjacent sections of the steel bar connector.

[0017] Step S002: Close the left half of the jack and the right half of the jack and fix them on both sides of the rebar connection joint to be tested;

[0018] Step S003: Fix the spliced ​​sleeve on the outer side of the left half jack and the right half jack on both sides of the reinforcing bar to be tested. Insert a clamp between the sleeve and the reinforcing bar to fix the sleeve and the reinforcing bar. Fix a pressure sensor that can be squeezed by a hydraulic structure on the inner side of the sleeve.

[0019] Step S004: Supply oil to the hydraulic structure inside the left half jack and the right half jack, so that the left half jack and the right half jack push the sleeve outward together to gradually stretch the steel bars at both ends of the steel bar connection joint, and complete the inspection of the steel bar connection joint.

[0020] Step S005: Record the pressure sensor values ​​and changes in values ​​under test conditions, and then obtain the bearing capacity characteristics of the rebar connection joint;

[0021] Step S006: Remove the left and right halves of the jacks to expose the steel rebar connection joints.

[0022] Furthermore, during step S002, the reserved test distances at both ends of the test rebar connection joint are equal, and the test rebar and the test rebar connection joint are in a taut state.

[0023] Furthermore, when installing the left and right halves of the jack, the steel bar connection joint to be tested and the steel bars at both ends should pass through the through hole of the through jack, and the connection joint of the two steel bars should be located inside the through hole and in the middle of the through hole.

[0024] Furthermore, when the diameter of the joint of the reinforcing bar to be tested and the diameter of the reinforcing bars at both ends are much smaller than the diameter of the through hole, the left half jack and the right half jack are combined to form a through jack that wraps around the joint of the reinforcing bar to be tested and the reinforcing bars on both sides of the joint. A rubber sleeve can also be fitted over the reinforcing bar, and the diameter of the rubber sleeve is slightly larger than the diameter of the through hole.

[0025] Furthermore, the diameter of the sleeve should be larger than the diameter of the through hole, and the hydraulic structures should all abut against the inner end face of the sleeve.

[0026] Furthermore, both ends of the sleeve should be flat.

[0027] Furthermore, the sleeve has a through hole for the reinforcing bar to pass through, and the clamp is a wedge-shaped piece placed in the through hole, with the thickness of the clamp gradually increasing from the bottom end to the top end of the through hole.

[0028] The principle and effect of this solution are as follows:

[0029] 1. This invention uses a splicing testing device to wrap around the rebar connection joint and stretch the rebars at both ends of the joint. Data is read by a pressure sensor to test the load-bearing capacity of the rebar connection joint in real time and accurately. The splicing testing device can be directly spliced ​​onto the rebar connection joint and adjacent rebars to be tested without cutting the rebars. This solves the problems of low testing efficiency, poor traceability, and difficulty in ensuring authenticity in traditional random sampling tests of mechanical connection joints.

[0030] 2. This invention uses a complete through-hole jack formed by combining the left and right halves of the jack as a spliced ​​testing device. The left and right halves of the jack are installed outside the rebar connection joint to be tested, forming a through-hole jack to wrap around the rebar connection joint. Then, sleeves are installed on the outer part of the rebars at both ends of the through-hole jack, and wedge-shaped clips are placed in the through holes of the sleeves to press against the rebars. The hydraulic structure inside the left and right halves of the jack pushes the inner end face of the sleeve, thereby stretching the rebar connection joint outward to test its load-bearing capacity. 3. Compared with the prior art, the present invention forms a through-hole jack that wraps around the rebar connection joint to be tested by combining the left half jack and the right half jack. It does not require cutting the connection joint on the installed rebar, and the test can be completed directly by the spliced ​​through-hole jack. It can realize the test of the bearing capacity of the mechanical connection joint of rebar in the in-situ structure. It has the characteristics of simple operation, simple data processing and result judgment, high test efficiency and strong traceability. It can effectively solve the problems of poor authenticity and low efficiency of on-site sampling and testing of mechanical connection joints of rebar in the current industry standard. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This diagram shows the left half of the jack in an in-situ test method for the bearing capacity of a rebar connection joint according to an embodiment of this application.

[0033] Figure 2 This diagram shows the right half of the jack in an in-situ test method for the bearing capacity of a rebar connection joint according to an embodiment of this application.

[0034] Figure 3 This illustration shows a schematic diagram of the combination of a through-hole jack for an in-situ test method for the bearing capacity of a rebar connection joint proposed in an embodiment of this application;

[0035] Figure 4 This illustration shows a schematic diagram of the combination of a through-hole jack for an in-situ test method for the bearing capacity of a rebar connection joint proposed in an embodiment of this application;

[0036] Figure 5 A schematic diagram of a hydraulic structure for an in-situ test method of bearing capacity of a steel bar connection joint proposed in an embodiment of this application is shown. Detailed Implementation

[0037] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0038] The reference numerals in the accompanying drawings include: 1. Left half jack, 2. Left half sector column, 3. Upper positioning platform, 4. Lower positioning platform, 5. Right half jack, 6. Middle positioning platform, 7. Right half sector column, 8. Rebar connection joint, 9. Clamping plate, 10. Sector sleeve, 11. Tensioning sleeve, 12. Top pressure sleeve, 13. Bottom boss, 14. Oil return nozzle, 15. Oil supply nozzle.

[0039] A method for in-situ testing of the bearing capacity of rebar connection joints, implemented for example... Figure 1 As shown:

[0040] Includes the following steps:

[0041] Step S001: Fix the steel bars at both ends of the steel bar connector to be tested, determine the position of the steel bar connector 8 to be tested, and clean the attachments on the steel bars of the two adjacent sections of the steel bar connector 8.

[0042] Step S002: Fix the splicing test device from both sides to the outside of the rebar connection joint 8 to be tested and the rebar adjacent to the rebar connection joint 8;

[0043] Step S003: Fix the spliced ​​sleeve on the outer steel bars at both ends of the spliced ​​test device, insert the clamp 9 between the inner side of the sleeve and the steel bar to fix the sleeve and the steel bar, and fix the pressure sensor that can be squeezed by the spliced ​​test device on the inner side of the sleeve.

[0044] Step S004: Start the splicing test device and push the sleeve to gradually stretch the steel bars at both ends of the steel bar connection joint 8;

[0045] Step S005: Record the pressure sensor values ​​and changes in values ​​under test conditions, thereby obtaining the load-bearing capacity characteristics of the rebar connection joint 8.

[0046] In this example, the splicing testing device used is a through-hole jack. Specifically, the through-hole jack consists of two interlocking left half jack 1 and right half jack 5. The specific structures of the left half jack 1 and right half jack 5 are as follows:

[0047] Both the left half of the jack 1 and the right half of the jack 5 are equipped with independent hydraulic structures. Each half can be used as an individual jack. When combined, they form a complete through-hole jack. The through-hole jack has a through hole along its axis, formed by the inner walls of both halves, allowing two connected reinforcing bars to pass through. The reinforcing bar connection joint 8 is located at the center of the through hole in the through-hole jack, and the load-bearing capacity of the joint is tested on-site using the combined through-hole jack.

[0048] Specifically, such as Figure 1 and Figure 2 As shown, the hydraulic structures in the left half jack 1 and the right half jack 5 are identical in composition and size, but the positioning and installation structures used for splicing and installing the left half jack 1 and the right half jack 5 are different.

[0049] The left half of the jack 1 includes a left jack body and a left half hydraulic structure installed inside the left jack body. The left jack body is a solid left half-fan-shaped column 2 with a 120-degree notch, and a through hole is opened coaxially on the left half-fan-shaped column 2. On both sides of the notch of the left half-fan-shaped column 2, there are also fan-shaped grooves that are opened inward, and the angle of the fan-shaped grooves is 60 degrees. The fan-shaped grooves divide the upper and lower ends of the left half-fan-shaped column 2 into an upper positioning platform 3 and a lower positioning platform 4.

[0050] The right half of the jack 5 includes a right jack body and a right half hydraulic structure installed inside the right jack body. The right jack body is also a solid right half-fan-shaped column 7 with a 240-degree notch, and a through hole is also opened coaxially on the right half-fan-shaped column 7. On both sides of the right half-fan-shaped column 7, there is also a central positioning platform 6 integrally formed outward, and the central positioning platform 6 is a fan-shaped platform at a 60-degree angle.

[0051] The left half-sector column 2 and the right half-sector column 7 have the same diameter, as do the through holes on the left half-sector column 2 and the right half-sector column 7. When the left half-jack 1 and the right half-jack 5 are combined to form a through-hole jack, the middle positioning platforms 6 on both sides of the right half-sector column 7 are placed between the upper positioning platforms 3 and the lower positioning platforms 4 on both sides of the left half-sector column 2, and are fixed by the positioning and installation structure. The through holes on the left half-sector column 2 and the right half-sector column 7 combine to form the through holes of the through-hole jack.

[0052] In this embodiment, the left half hydraulic structure installed in the left half jack 1 and the right half hydraulic structure installed in the right half jack 5 have the same composition and size. The left half sector column 2 and the right half sector column 7 in the left half jack 1 and the right half jack 5 are each provided with a power chamber for installing the left half hydraulic structure and the right half hydraulic structure respectively.

[0053] Both the left and right hydraulic structures mainly include a sector-shaped sleeve 10, a tensioning sleeve 11 installed inside the sector-shaped sleeve 10, a pressure sleeve 12 installed inside the tensioning sleeve 11, and a return spring. The tensioning sleeve 11 also has an integrally formed sealing sleeve that fits against the outer wall of the pressure sleeve 12 and allows the pressure sleeve 12 to slide out. A sealing ring is installed between the inner wall of the sealing sleeve and the outer wall of the pressure sleeve 12. The return spring is sleeved on the outer wall of the pressure sleeve 12 located between the tensioning sleeve 11 and the sealing sleeve. A tensioning oil cavity is formed between the top end of the tensioning sleeve 11 and the sector-shaped sleeve 10, and a pressure oil cavity is formed between the tensioning sleeve 11 and the pressure sleeve 12 inside the sealing sleeve. An oil pipe is connected to the tensioning oil cavity and the pressure oil cavity on the sector-shaped sleeve 10, and both oil pipes are connected to the oil supply nozzle 15 and the oil return nozzle 14, respectively. An internal oil supply check valve is installed in the pipeline connecting the oil supply nozzle 15, and an external oil discharge check valve is installed in the pipeline connecting the oil return nozzle 14.

[0054] This hydraulic structure has a dual function: tensioning and anchoring. Oil is supplied through the supply nozzle 15 to perform both functions. Oil is returned sequentially through the return nozzle 14 to retract the sector sleeve 10 and the tensioning sleeve 11.

[0055] A vertical top boss is welded to the top of the sector sleeve 10. A vertical bottom boss 13 is also welded to the bottom of the tensioning sleeve 11; both the top and bottom bosses 13 are vertically positioned. The sector sleeve 10, the tensioning cylinder, and the pressure cylinder are all sector-shaped. Holes are provided at the top and bottom ends of the left half of the jack 1 and the right half of the jack 5, respectively, to expose the top and bottom bosses 13.

[0056] Specifically, the left and right halves of the hydraulic structure are both 100-degree fan-shaped, with a through hole at the axis of the fan-shaped sleeve 10, tension sleeve 11, and pressure sleeve 12. When the left and right halves of the hydraulic structure are closed, it mainly involves the closure of the 100-degree fan-shaped sleeve 10 in the left and right halves of the hydraulic structure. After closure, a complete through-hole jack is formed, and the through hole at the axis closes to form the through hole of the through-hole jack.

[0057] like Figure 3 and Figure 4As shown, during testing, a sleeve needs to be installed on the outer reinforcing bars of the top and bottom protrusions 13 on both sides. In this embodiment, the sleeve is also a splicing type, consisting of two baffles on the left and right sides. The inner ends of the baffles are symmetrically equipped with fixing grooves, which can be joined together. Bolt holes are provided in the fixing grooves, and the sleeve is fixed by bolts engaging with the bolt holes. In this embodiment, the two ends of the spliced ​​sleeve are flat, and the inner end faces of the sleeve abut against the ends of the top and bottom protrusions 13, respectively. The diameter of the sleeve is larger than the diameter of the top and bottom protrusions 13. A through hole is also provided on the sleeve for the reinforcing bar to pass through. After the reinforcing bar passes through the through hole, a clamping piece 9 is inserted outside the reinforcing bar located within the through hole. In this embodiment, two clamping pieces 9 are inserted outside the reinforcing bar located within the through hole. The clamping pieces 9 are wedge-shaped pieces, and their thickness gradually increases from the bottom to the top of the through hole. By inserting the clamp 9 into the through hole, as the reinforcing bar is pushed outward by the sleeve, the clamp 9 will be brought into the through hole by the sleeve, making the reinforcing bar more stable.

[0058] In this embodiment, the positioning and installation structure inside the left half of the jack 1 is the main positioning and installation structure, and the positioning and installation structure inside the right half of the jack 5 is the secondary positioning and installation structure. Furthermore, the main positioning and installation structure is divided into upper and lower parts, namely the upper main positioning and installation structure and the lower main positioning and installation structure.

[0059] The secondary positioning installation structure includes secondary positioning threaded holes respectively opened on the upper and lower end faces of the central positioning platform 6.

[0060] Both the upper and lower positioning mounting structures consist of main positioning threaded holes respectively opened on the upper positioning platform 3 and the lower positioning platform 4, and main positioning bolts respectively installed in the main positioning threaded holes. The main positioning bolts can be screwed into the auxiliary positioning threaded holes on the middle positioning platform 6 through the threaded connection between them and the main positioning threaded holes, thus completing the connection between the left half jack 1 and the right half jack 5.

[0061] The spliced ​​testing device is formed by combining the left half of the jack 1 and the right half of the jack 5. The specific usage steps are as follows:

[0062] Step S001: Fix the steel bars at both ends of the steel bar connector to be tested, determine the position of the steel bar connector 8 to be tested, and clean the attachments on the steel bars of the two adjacent sections of the steel bar connector 8.

[0063] Step S002: Close and fix the left half of the jack 1 and the right half of the jack 5 to both sides of the rebar connection joint 8 to be tested;

[0064] Step S003: Fix the spliced ​​sleeve on the steel bar to be tested at both ends of the left half jack 1 and the right half jack 5. Insert the clamp 9 between the sleeve and the steel bar to fix the sleeve and the steel bar. Fix the pressure sensor that can be squeezed by the hydraulic structure on the inside of the sleeve.

[0065] Step S004: Supply oil to the oil supply nozzle 15 and oil return nozzle 14 in the left half jack 1 and the right half jack 5, so that the left half jack 1 and the right half jack 5 push the sleeve outward together to gradually stretch the steel bars at both ends of the steel bar connection joint 8, and complete the inspection of the steel bar connection joint 8.

[0066] Step S005: Record the pressure sensor values ​​and changes in values ​​under test conditions, and then obtain the bearing capacity characteristics of the rebar connection joint 8;

[0067] Step S006: Remove the left half of the jack 1 and the right half of the jack 5 to expose the steel bar connection joint 8.

[0068] When performing step S001, the attachments on the rebar connection joint 8 should also be cleaned. At the same time, it is not advisable to use water-containing sprays or coatings to soften the attachments during the cleaning process.

[0069] When performing step S002, the reserved test distances at both ends of the test bar connection joint 8 are equal, and the test bar and the test bar connection joint 8 are in a taut state.

[0070] When installing the left half jack 1 and the right half jack 5, the steel bar connection joint 8 to be tested and the steel bars at both ends should pass through the through hole of the through jack, and the connection joint of the two steel bars should be located inside the through hole, preferably in the middle of the through hole.

[0071] When the diameter of the rebar connection joint 8 to be tested and the diameter of the rebars at both ends are much smaller than the diameter of the through hole, the left half jack 1 and the right half jack 5 are combined to form a through jack that wraps around the rebar connection joint 8 to be tested and the rebars on both sides of the joint. A rubber sleeve can also be fitted over the rebars. The diameter of the rubber sleeve is slightly larger than the diameter of the through hole.

[0072] When installing the sleeve, the following points should be noted when selecting the sleeve:

[0073] The diameter of the sleeve should be larger than the diameter of the through hole and larger than the largest diameter of the top boss and bottom boss 13;

[0074] The edges of the sleeve should have rounded corners;

[0075] When installing the sleeve, it should be installed on the outside of the top and bottom bosses 13 and fixed to the reinforcing bars. The distance between the sleeve fixed to both ends of the reinforcing bar connection joint 8 and the end face of the hydraulic structure inside the adjacent through-hole jack should be equal. The pressure sensor installed inside the sleeve should also be equidistant from the end face of the hydraulic structure inside the adjacent through-hole jack.

[0076] This invention uses a combination of a left half jack 1 and a right half jack 5 to form a through-hole jack that wraps around the rebar connection joint 8 to be tested. The rebar connection joint 8 can be tested on-site without being moved. Without changing the position of the rebar connection joint 8, the test can be completed directly by the spliced ​​through-hole jack. It can realize the test of the bearing capacity of the mechanical connection joint of rebar in the original position of the structure. It has the characteristics of simple operation, simple data processing and result judgment, high testing efficiency and strong traceability. It can effectively solve the problems of poor authenticity and low efficiency of on-site sampling and testing of mechanical connection joints of rebar in the current industry standard. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for testing the load bearing capacity of a reinforcing bar connection joint in situ, characterized in that: Includes the following steps: Step S001: Fix the steel bars at both ends of the steel bar connector to be tested, determine the location of the steel bar connector, and clean the attachments on the steel bars of the two adjacent sections of the steel bar connector. Step S002: Fix the splicing test device from both sides to the outside of the rebar connection joint to be tested and the rebar adjacent to the rebar connection joint; Step S003: Fix the spliced ​​sleeve on the outer steel bars at both ends of the spliced ​​test device, insert a clip between the inner side of the sleeve and the steel bar to fix the sleeve and the steel bar, and fix a pressure sensor that can be squeezed by the spliced ​​test device on the inner side of the sleeve. Step S004: Start the splicing test device and push the sleeve to gradually stretch the steel bars at both ends of the steel bar connection joint outward; Step S005: Record the pressure sensor values ​​and changes in values ​​under test conditions to obtain the bearing capacity characteristics of the rebar connection joint; The splicing test device is a through-hole jack, which consists of two spliced ​​left half jacks and right half jacks. The left half jack includes a left jack body and a left half hydraulic structure installed in the left jack body. The left jack body is a solid left half sector column with a 120-degree notch. A through hole is opened coaxially on the left half sector column. On both sides of the notch of the left half sector column, there is a sector groove that is opened inward. The angle of the sector groove is 60 degrees. The sector groove divides the upper and lower ends of the left half sector column into an upper positioning platform and a lower positioning platform. The right half of the jack includes the right jack body and the right half hydraulic structure installed inside the right jack body. The right jack body is also a solid right half fan-shaped column with a 240-degree notch. A through hole is also opened on the right half fan-shaped column on the same axis. On both sides of the right half fan-shaped column, there is also a central positioning platform integrally formed outward. The central positioning platform is a fan-shaped platform with a 60-degree angle. Both the left and right hydraulic structures include a sector sleeve, a tensioning sleeve installed inside the sector sleeve, a top pressure sleeve installed inside the tensioning sleeve, and a return spring.

2. The method for in-situ testing of the bearing capacity of a rebar connection joint according to claim 1, characterized in that, When performing step S002, the reserved test distances at both ends of the test rebar connection joint are equal, and the test rebar and the test rebar connection joint are in a taut state.

3. The method for in-situ testing of the bearing capacity of a rebar connection joint according to claim 1, characterized in that, When installing the left and right halves of the jack, the steel bar connection joint to be tested and the steel bars at both ends should pass through the through hole of the through jack, and the connection joint of the two steel bars should be located inside the through hole and in the middle of the through hole.

4. The in-situ test method for the bearing capacity of a rebar connection joint according to claim 1, characterized in that, When the diameter of the joint of the reinforcing bar to be tested and the diameter of the reinforcing bars at both ends are much smaller than the diameter of the through hole, the left half jack and the right half jack are combined to form a through jack that wraps around the joint of the reinforcing bar to be tested and the reinforcing bars on both sides of the joint. A rubber sleeve can also be fitted over the reinforcing bar. The diameter of the rubber sleeve is slightly larger than the diameter of the through hole.

5. A method for in-situ testing of the bearing capacity of a steel rebar connection joint according to any one of claims 2 to 4, characterized in that, The diameter of the sleeve should be larger than the diameter of the through hole, and the hydraulic structures should all abut against the inner end face of the sleeve.

6. The method for in-situ testing of the bearing capacity of a rebar connection joint according to claim 5, characterized in that, Both ends of the sleeve should be flat.

7. The in-situ test method for the bearing capacity of a rebar connection joint according to claim 6, characterized in that, The sleeve has a through hole for the reinforcing bar to pass through, and the clamp is a wedge-shaped piece placed in the through hole. The thickness of the clamp gradually increases from the bottom end to the top end of the through hole.

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