A device for testing the bearing capacity of a reinforcing steel bar connection joint in situ

Abstract

The present application relates to the technical field of steel bar connecting joint detection device, and specifically discloses a device for in-situ testing of bearing capacity of steel bar connecting joint, which comprises a through jack, the through jack comprises a left half jack and a right half jack which are detachably connected, and the left half jack and the right half jack are respectively provided with hydraulic structures which can be mutually attached and used for stretching the steel bars at both ends, the hydraulic structures in the left half jack and the right half jack are coaxially provided with through holes for the steel bars and the steel bar mechanical connecting head to pass through when the hydraulic structures are spliced, and the device further comprises a spliced sleeve head which is sleeved on the steel bar and can be pushed out by the end of the hydraulic structure output end, and a clamping piece which can be placed between the sleeve head and the gap of the steel bar, so that the problems of low detection efficiency, poor traceability and great difficulty in ensuring authenticity in the traditional random test piece inspection of mechanical connecting joint quality are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a steel bar connecting joint detection device, and particularly discloses a device for in-situ testing of the bearing capacity of a steel bar connecting joint. BACKGROUND

[0002] A reinforced concrete structure is one of the most commonly used structural forms in modern building structures. Modern reinforced concrete components are often tens of meters long, or even hundreds of meters long, and the length of the steel bars produced by steel enterprises is limited, so the steel bars need to be lengthened during on-site construction. The steel bar mechanical connecting technology has high reliable performance, a wide application range, simple on-site construction, fast speed, and no fire hazards, and is the most widely used steel bar joint form in current engineering.

[0003] Steel bar mechanical connecting joint construction is a key process of steel bar sub-item engineering quality control, and the quality has a significant influence on the safety of the reinforced concrete structure and is one of the focuses of the quality control of the reinforced concrete structure. The quality of the steel bar mechanical connecting joint is influenced by many factors such as raw materials, processing parameters, construction quality, and the like, and a series of quality control methods such as material incoming inspection, type inspection, process inspection, and process inspection are proposed in the industry standard, and the ultimate compressive strength test is performed on the test piece randomly taken from the installed structure to finally inspect the quality of the steel bar mechanical connecting joint.

[0004] The method of randomly taking a test piece from an engineering structure to inspect the quality of the mechanical connecting joint is essentially on-site witnessed sampling and sample detection, and cannot completely realize on-site inspection, has low detection efficiency, poor traceability, and great difficulty in ensuring authenticity.

[0005] On-site sampling and detection is the final evaluation of the quality of the steel bar mechanical connecting joint, and is directly related to the quality of the engineering structure. The current standard requires that the sampling is performed according to the inspection batch, and then the sample is sent to a detection unit for detection under the witness of a supervising engineer, which is ultimately sample detection, and does not realize real on-site detection. The authenticity of the test piece taken on site is difficult to guarantee during the sampling process. In addition, even if the sample detection result is qualified, the sampling position still needs to be repaired, which delays the time, has low efficiency, and delays the construction period.

[0006] Therefore, the inventor provides a device for in-situ testing of the bearing capacity of a steel bar connecting joint to solve the above problems. SUMMARY

[0007] The purpose of the present application is to solve the problems of low detection efficiency, poor traceability, and great difficulty in ensuring authenticity in the traditional random test piece inspection of the mechanical connecting joint.

[0008] In order to achieve the above object, the basic scheme of the present application provides a device for testing the bearing capacity of a steel bar connecting joint in situ, comprising a through jack, the through jack comprising a left half jack and a right half jack connected detachably, and a hydraulic structure arranged in each of the left half jack and the right half jack for mutually abutting and stretching the steel bar to both ends, and the hydraulic structures in the left half jack and the right half jack are coaxially provided with a through hole for the steel bar and a steel bar mechanical connecting head to pass through when spliced.

[0009] The device further comprises a spliced sleeve head sleeved on the steel bar and capable of being pushed out by the end of the hydraulic structure output end, and a clamping piece capable of being arranged between the sleeve head and the gap of the steel bar.

[0010] Further, the left half jack comprises a left jack body and a left half hydraulic structure arranged in the left jack body, and the right half jack comprises a right jack body and a right half hydraulic structure.

[0011] Further, the left jack body comprises a left half fan-shaped column and a left half connecting structure arranged at both ends of the two side end portions of the left half fan-shaped column respectively, and the right jack body comprises a right half fan-shaped column and a right half connecting structure arranged at both sides of the right half fan-shaped column and capable of being detachably connected with the left half connecting structure.

[0012] Further, the left half connecting structure comprises an upper positioning table and a lower positioning table arranged at both ends of the two side end portions of the left half fan-shaped column respectively, and the right half connecting structure comprises a middle positioning table arranged at both sides of the right half fan-shaped column and capable of being detachably connected between the upper positioning table and the lower positioning table on the same side respectively.

[0013] Further, end faces of both ends of the middle positioning table are provided with a secondary positioning threaded hole, and the upper positioning table and the lower positioning table are both provided with a primary positioning threaded hole coaxial with the secondary positioning threaded hole.

[0014] Further, the hydraulic structure comprises a fan-shaped sleeve, a tensioning sleeve slidably connected at the bottom end of the fan-shaped sleeve, a pressing sleeve slidably connected at the bottom end of the tensioning sleeve, and a rebound spring sleeved on the outer wall of the pressing sleeve, the inner wall of the tensioning sleeve below the rebound spring is provided with a sealing sleeve slidably connected with the outer wall of the pressing sleeve, the fan-shaped sleeve, the tensioning sleeve and the pressing sleeve are coaxially provided with a through hole, a tensioning oil cavity is formed between the top end of the tensioning sleeve and the fan-shaped sleeve, a pressing oil cavity is formed between the bottom end of the tensioning sleeve and the pressing sleeve, the tensioning oil cavity and the pressing oil cavity are both communicated with an oil pipe for oil flow, and the left half jack and the right half jack are respectively provided with a oil supply nozzle and an oil return nozzle for unidirectional oil supply and unidirectional oil return respectively.

[0015] Further, the top end of the fan-shaped sleeve is provided with a vertical top boss, the bottom end of the tensioning sleeve is provided with a vertical bottom boss, and the diameters of the top boss and the bottom boss are both smaller than the diameter of the sleeve head.

[0016] Further, the left half jack is in a 120-degree sector, and the right half jack is in a 240-degree sector.

[0017] The principle and effect of the present application are that:

[0018] 1. The left half jack and the right half jack are combined to form a complete through-core jack, which is installed outside the steel bar connecting joint to be tested, thereby forming a through-core jack to wrap the steel bar connecting joint to be tested. Then, the steel bars at both ends of the steel bar connecting joint to be tested are located at one end of the through-core jack, and the clamping pieces are inserted into the gap between the sleeve head and the steel bars. The end of the output end of the hydraulic structure in the left half jack and the right half jack is pressed against the inner side surface of the sleeve head, thereby pushing the sleeve head and stretching the steel bar connecting joint to be tested for load capacity detection.

[0019] 2. Compared with the prior art, the left half jack and the right half jack are combined to form a through-core jack wrapped outside the steel bar connecting joint to be tested. The steel bar connecting joint to be tested does not need to be moved for on-site detection. The detection can be directly completed by the spliced through-core jack without changing the position of the steel bar connecting joint to be tested. The load capacity of the steel bar mechanical connecting joint can be detected in the structure in situ. The present application has the characteristics of simple operation, simple data processing and result determination, high detection efficiency, and strong traceability, and can effectively solve the problems of poor authenticity and low efficiency of the current industry standard steel bar mechanical connecting joint on-site sampling detection. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 A schematic diagram of a left half jack of a steel bar connecting joint load capacity on-site testing device is shown.

[0022] Figure 2 A schematic diagram of a right half jack of a steel bar connecting joint load capacity on-site testing device is shown.

[0023] Figure 3 A combined schematic diagram of a through-core jack of a steel bar connecting joint load capacity on-site testing device is shown.

[0024] Figure 4 A combination diagram of a penetrating jack of a device for testing the bearing capacity of a steel bar connecting joint in situ is shown in the embodiments of the present application;

[0025] Figure 5 A schematic diagram of a hydraulic structure of a device for testing the bearing capacity of a steel bar connecting joint in situ is shown in the embodiments of the present application. DETAILED DESCRIPTION

[0026] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0027] The reference signs in the drawings of the specification include: left half jack 1, left half sector column 2, upper positioning table 3, lower positioning table 4, right half jack 5, middle positioning table 6, right half sector column 7, steel bar connecting joint 8, clamping piece 9, sector sleeve 10, tensioning sleeve 11, pressing sleeve 12, bottom boss 13, oil return nozzle 14, oil supply nozzle 15.

[0028] A device for testing the bearing capacity of a steel bar connecting joint in situ, as shown in the embodiments of the present application, Figure 1

[0029] includes left half jack 1 and right half jack 5, and the left half jack 1 and the right half jack 5 are combined to form a complete penetrating jack.

[0030] The left half jack 1 and the right half jack 5 are each provided with a separate hydraulic structure. The left half jack 1 and the right half jack 5 can each be used as a separate jack. When the left half jack 1 and the right half jack 5 are combined, a complete penetrating jack is formed, and the penetrating jack has a through hole along the axis with the inner walls of the left half jack 1 and the right half jack 5 as the walls, and the two steel bars connected can pass through the penetrating jack. The steel bar connecting joint 8 is then placed in the center of the through hole in the penetrating jack and subjected to the bearing capacity test in situ by the penetrating jack formed by the combination.

[0031] Specifically, as shown in Figure 1 and Figure 2 , the hydraulic structures in the left half jack 1 and the right half jack 5 are the same in composition and size, and the positioning and mounting structures for mutual splicing and mounting of the left half jack 1 and the right half jack 5 are different.

[0032] ​The left half jack 1 comprises 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 gap. A through hole is coaxially formed in the left half sector column. A sector slot is formed inwardly on each side of the gap of the left half sector column. The sector slots are both 60 degrees and separate the upper and lower ends of the left half sector column into an upper positioning table 3 and a lower positioning table 4.

[0033] The right half jack 5 comprises a right jack body and a right half hydraulic structure installed in the right jack body. The right jack body is also a solid right half sector column with a 240-degree gap. A through hole is coaxially formed in the right half sector column. A middle positioning table 6 is integrally formed outwardly on each side of the right half sector column. The middle positioning table 6 is a sector table with a 60-degree angle.

[0034] The left half sector column 2 and the right half sector column 7 are equal in diameter. The through holes in the left half sector column 2 and the right half sector column 7 are also equal in diameter. When the left half jack 1 and the right half jack 5 are combined to form a through jack, the middle positioning tables 6 on the two sides of the right half sector column 7 are respectively arranged between the upper positioning table 3 and the lower positioning table 4 on the two sides of the left half sector column 2 and are fixed by a positioning and mounting structure. The through holes in the left half sector column 2 and the right half sector column 7 are combined to form a through hole of the through jack.

[0035] In the embodiment, as shown in FIG. 1, 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 are the same in composition but different in size. Figure 5 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 both provided with power cavities for respectively mounting the left half hydraulic structure and the right half hydraulic structure.

[0036] The left half hydraulic structure and the right half hydraulic structure both mainly comprise a sector sleeve 10, a tension sleeve 11 installed in the sector sleeve 10, a pressing sleeve 12 installed in the tension sleeve 11, and a rebound spring. The tension sleeve 11 is integrally formed with a sealing sleeve abutting the outer wall of the pressing sleeve 12 and allowing the pressing sleeve 12 to slide out. A sealing ring is installed between the inner wall of the sealing sleeve and the outer wall of the pressing sleeve 12. The rebound spring is sleeved on the outer wall of the pressing sleeve 12 between the tension sleeve 11 and the sealing sleeve. A tension oil cavity is formed between the top end of the tension sleeve 11 and the sector sleeve 10. A pressing oil cavity is formed between the tension sleeve 11 and the pressing sleeve 12 in the sealing sleeve. An oil pipe is communicated with the tension oil cavity and the pressing oil cavity on the sector sleeve 10. The oil pipe is communicated with an oil supply nozzle 15 and an oil return nozzle 14. A one-way valve for inward oil supply is installed in the pipeline connecting the oil pipe with the oil supply nozzle 15. A one-way valve for outward oil discharge is installed in the pipeline connecting the oil pipe with the oil return nozzle 14.

[0037] The hydraulic structure has double action, i.e. tensioning and anchoring. Oil is supplied from the oil supply nozzle 15 to complete the two actions of tensioning and anchoring. Oil is returned from the oil return nozzle 14 in turn to recover the fan-shaped sleeve 10 and the tensioning sleeve 11.

[0038] A vertical top boss is welded at the top end of the fan-shaped sleeve 10. A vertical bottom boss 13 is also welded at the bottom of the tensioning sleeve 11. The top boss and the bottom boss 13 are vertically arranged. The fan-shaped sleeve 10, the tensioning oil cylinder and the anchoring oil cylinder are all fan-shaped. Holes are formed at the upper and lower ends of the left half jack 1 and the right half jack 5 to expose the top boss and the bottom boss 13.

[0039] Specifically, the left half hydraulic structure is a whole 100-degree fan-shaped structure, and the right half hydraulic structure is a whole 100-degree fan-shaped structure. A through hole is formed at the center of the fan-shaped sleeve 10, the tensioning sleeve 11 and the anchoring sleeve 12. When the left half hydraulic structure and the right half hydraulic structure are folded, the 100-degree fan-shaped sleeve 10 in the left half hydraulic structure is folded with the 100-degree fan-shaped sleeve 10 in the right half hydraulic structure. After folding, a complete through-jack is formed, and the through hole at the center is folded to form a through hole of the through-jack.

[0040] As shown in Figure 3 and Figure 4 When testing, a sleeve head is also installed on the steel bars outside the top boss and the bottom boss 13 on both sides. In this embodiment, the sleeve head is also spliced and composed of left and right blocking pieces. Symmetrical fixing grooves are formed at the inner end of the blocking pieces. The fixing grooves on the two blocking pieces can be spliced with each other. A bolt hole is formed on the fixing groove, and the sleeve head is fixed by cooperating with the bolt hole. In this embodiment, the two end faces of the spliced sleeve head are flat, and the inner end faces of the sleeve head abut against the end faces of the top boss and the bottom boss 13. The diameter of the sleeve head is larger than the diameters of the top boss and the bottom boss 13. A through hole is also formed on the sleeve head for the steel bars to pass through. After the steel bars pass through the through hole, the blocking pieces 9 are inserted outside the steel bars in the through hole. In this embodiment, two blocking pieces 9 are inserted outside the steel bars in the through hole. The blocking pieces 9 are wedge-shaped pieces, and the thickness of the blocking pieces 9 gradually increases from the bottom end to the top end. By inserting the blocking pieces 9 in the through hole, when the steel bars are pushed outwards by the sleeve head, the blocking pieces 9 are brought into the through hole from the sleeve head, so that the steel bars are more stable.

[0041] In this embodiment, the positioning and mounting structure in the left half jack 1 is the main positioning and mounting structure, and the positioning and mounting structure in the right half jack 5 is the auxiliary positioning and mounting structure. The main positioning and mounting structure is divided into upper and lower parts, which are the main upper positioning and mounting structure and the main lower positioning and mounting structure.

[0042] The auxiliary positioning installation structure comprises auxiliary positioning threaded holes respectively formed on the upper and lower end faces of the middle positioning table 6.

[0043] The main upper positioning installation structure and the main lower positioning installation structure are main positioning threaded holes respectively formed on the upper positioning table 3 and the lower positioning table 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 table 6 through the threaded connection relationship between the main positioning threaded holes and the main positioning bolts, thereby completing the connection between the left half jack 1 and the right half jack 5.

[0044] In use, the steel mechanical connecting head to be tested is first determined, then the left half jack 1 and the right half jack 5 are combined and sleeved on the steel mechanical connecting head to be tested, that is, the steel connecting joint 8, and a section of the steel rod extending out of the top boss and the bottom boss 13 is fixed through the sleeve head and the clamping piece 9. Then, the oil is supplied through the oil supply nozzle 15, the sleeve head is pushed out, and the steel rod clamped by the sleeve head and the clamping piece 9 is synchronously tensioned outward. At this time, the extension amount of the tension cylinder and the pressing cylinder is the output amount of the bearing capacity of the steel connecting joint 8, thereby realizing the in-situ testing of the steel mechanical connecting head.

[0045] The above description is only a preferred embodiment of the present application and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A device for in-situ testing of the bearing capacity of steel bar connection joints, comprising a through-hole jack, characterized in that: The through-hole jack includes a detachable left half jack and a right half jack. 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 to 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. It also includes a spliced ​​sleeve that is fitted over the reinforcing bar and can be pushed out by the end of the hydraulic structure output, and a clamp that can be inserted between the sleeve and the reinforcing bar. The left half jack includes a left jack body and a left half hydraulic structure located within the left jack body; the right half jack includes a right jack body and a right half hydraulic structure. The hydraulic structure includes a sector sleeve, a tensioning sleeve slidably connected to the bottom end of the sector sleeve, a top pressure sleeve slidably connected to the bottom end of the tensioning sleeve, and a rebound spring sleeved on the outer wall of the top pressure sleeve. The inner wall of the tensioning sleeve below the rebound spring is provided with a sealing sleeve slidably connected to the outer wall of the top pressure sleeve. The sector sleeve, tensioning sleeve, and top pressure sleeve are coaxially connected by a through hole. A tensioning oil cavity is formed between the top end of the tensioning sleeve and the sector sleeve, and a top pressure oil cavity is formed between the bottom end of the tensioning sleeve and the top pressure sleeve. Both the tensioning oil cavity and the top pressure oil cavity are connected to an oil pipe for oil flow. The left half of the jack and the right half of the jack are respectively provided with an oil supply nozzle and an oil return nozzle connected to the oil pipe for one-way oil supply and one-way oil return. The left half of the jack is in a 240-degree fan shape, and the right half of the jack is in a 120-degree fan shape.

2. The in-situ testing device for the bearing capacity of steel bar connection joints according to claim 1, characterized in that, The left top body includes a left half-fan-shaped column and left half connecting structures respectively located at both ends of the left half-fan-shaped column. The right top body includes a right half-fan-shaped column and right half connecting structures respectively located on both sides of the right half-fan-shaped column and detachably connected to the left half connecting structure.

3. The in-situ testing device for the bearing capacity of steel bar connection joints according to claim 2, characterized in that, The left half connecting structure includes an upper positioning platform and a lower positioning platform respectively located at both ends of the left half fan-shaped column. The right half connecting structure includes a middle positioning platform respectively located on both sides of the right half fan-shaped column and detachably connected between the upper positioning platform and the lower positioning platform on the same side.

4. The in-situ testing device for the bearing capacity of steel bar connection joints according to claim 3, characterized in that, Both ends of the middle positioning platform are provided with auxiliary positioning threaded holes, and both the upper and lower positioning platforms are provided with main positioning threaded holes that are coaxial with the auxiliary positioning threaded holes.

5. A device for in-situ testing of the bearing capacity of steel bar connection joints according to claim 1, characterized in that, The top of the fan-shaped sleeve is provided with a vertical top boss, and the bottom of the tensioning sleeve is provided with a vertical bottom boss. The diameters of the top boss and the bottom boss are both smaller than the diameter of the sleeve head.

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