Detection device for anti-bending test of ladder stand of inspection well

Abstract

The utility model provides a detection device for a bending test of an inspection well ladder stand. The detection device comprises a base, a bracket, a connecting rod, a jack, a dial indicator and a hook, the base serves as a supporting structure, the jack is installed on the base in an inverted mode, and the jack is arranged in a suspended mode relative to the base so as to provide a stroke space for the jack to move downwards. The bottom end of the connecting rod is connected with the movable end of the jack and used for transmitting downward driving force of the jack. The hook is arranged at the top end of the connecting rod and is used for hanging a tested crawling ladder; the support is arranged at the upper end of the base and used for forming a supporting frame with a crossing span, and the two ends of the tested crawling ladder are erected on the support; the dial indicator is arranged at the top end of the support and used for detecting deformation displacement of the detected crawling ladder. The detection device has the advantages that the detection efficiency is improved, and the application condition is wide.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering detection, and specifically, to a bending resistance test detection device for inspection well ladders. Background Art

[0002] For traditional post-anchored pull-out detection of reinforced concrete (on-site inspection of ladders), a portable pull-out tester is used for detection. The pull-out tester consists of a hydraulic jack, a fixture, an explosion-proof oil pipe, a liquid crystal force display, and a manual hydraulic oil tank. There are some drawbacks in the process, mainly including:

[0003] During the detection process, the hydraulic jack needs to be placed on a smooth and flat concrete surface or a rigid flat plate. Currently, most of the inspection wells under construction are circular, resulting in an uneven force-bearing surface for the jack and unstable tensile force values.

[0004] On the other hand, most ladders adopt the post-implanted rebar construction process. The specification requires that after construction, a downward vertical load of 2.5 KN should be applied to the ladder and continuously loaded for 1 minute without cracks or other damages, and the deformation amount should not exceed 5 mm. After unloading, the residual deformation should not exceed 1 mm.

[0005] Due to the above limiting factors, it is difficult for the existing pull-out tester to detect the vertical tensile force. The detection operation process is relatively complex, and it requires testers to cooperate to fix the hydraulic jack, which is time-consuming and laborious and affects the detection value. Summary of the Utility Model

[0006] The purpose of the utility model is to address the deficiencies of the existing technology, and thus provide a bending resistance test detection device for inspection well ladders that improves the detection efficiency and has a wide range of applicable situations.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is: a bending resistance test detection device for inspection well ladders, including a base, a bracket, a connecting rod, a jack, a dial indicator, and a hook;

[0008] The base serves as a support structure, and the jack is installed upside down on the base. The jack is suspended relative to the base to provide a travel space for the jack to move downward;

[0009] The bottom end of the connecting rod is connected to the movable end of the jack for transmitting the downward driving force of the jack;

[0010] The hook is arranged at the top end of the connecting rod for hanging the ladder to be tested;

[0011] The bracket is arranged at the upper end of the base to form a support frame with a spanning span, and both ends of the ladder to be tested are placed on the bracket;

[0012] The dial indicator is arranged at the top end of the bracket for detecting the deformation displacement of the ladder to be tested.

[0013] Preferably, the bracket includes two vertical frames fixed with bases, the two vertical frames are arranged on both sides of the jack, a span is formed between the two vertical frames, and the top ends of the two vertical frames are used to set up the ladder to be tested.

[0014] Preferably, the connecting rod is a connecting rod with a connectable length, and adjacent connecting rods are connected via threaded sleeves.

[0015] Preferably, the connecting rod is a φ20mm-φ30mm threaded steel bar force transmission connecting rod.

[0016] Preferably, the stand and the base are fixed by magnetic attraction so that the span of the two stands is adjustable.

[0017] Preferably, the jack is a hydraulic jack.

[0018] Preferably, the jack is connected to the hydraulic manual oil pump through an explosion-proof oil pipe.

[0019] Preferably, the base is a rigid base formed by welding steel plates, and support legs are arranged at the four corners of the base to form a suspended space.

[0020] Preferably, a 200 mm high partition is welded at the center of the base for installing the jack, and a circular hole for passing the clamp is reserved in the middle of the partition for passing the connecting rod.

[0021] Preferably, two micrometers are provided, one on each of the two stands.

[0022] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model has the following advantages:

[0023] The overall framework of the detection device is easy to build, which can greatly improve the detection efficiency. The detection span can be determined according to the size of the ladder, saving labor costs and time costs of detection, and enhancing the applicability of ladder bending resistance detection. The detection phase can be entered after the ladder is prepared to detect whether the force meets the requirements, avoiding on-site environmental detection at the installation site, thereby improving effectiveness and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the bending resistance test detection device of the inspection well ladder in the utility model.

[0025] In the figure: 1. micrometer; 2. ladder under test; 3. connecting rod; 4. bracket; 5. threaded sleeve; 6. jack; 7. explosion-proof oil pipe; 8. hook; 9. base; 10. hydraulic manual oil pump. DETAILED DESCRIPTION

[0026] The technical solution of the present utility model will be further described in detail through specific embodiments below.

[0027] As Figure 1 shown, an inspection well ladder bending resistance test detection device includes a base 9, a bracket 4, a connecting rod 3, a jack 6, a dial indicator 1 and a hook 8.

[0028] The base 9 serves as a support structure. The jack 6 is installed upside down on the base 9. The jack 6 is suspended relative to the base 9 to provide a travel space for the jack 6 to move downward. In this embodiment, the base 9 is a rigid base welded by steel plates. Support legs are arranged at the four corners of the base 9 to form a suspended space. A partition with a height of 200 mm is welded at the center of the base 9 for installing the jack 6. A clamping fixture passage round hole is reserved in the middle of the partition for the connecting rod 3 to pass through. The jack is a hydraulic jack 6, and the jack 6 is connected to a hydraulic manual oil pump 10 through an explosion-proof oil pipe 7.

[0029] The bottom end of the connecting rod 3 is connected to the movable end of the jack 6 for transmitting the downward driving force of the jack 6. In this embodiment, the connecting rod 3 is designed as a connecting rod with a continuous length, and adjacent connecting rods are connected by a threaded sleeve 5. The connecting rod 3 is a threaded steel bar force transmission connecting rod with a diameter of φ20mm - φ30mm.

[0030] Among them, the bottom end of the connecting rod 3 is connected to the rod end of the jack 6 through a fixture, and the two move up and down synchronously, so as to transmit the force of the jack 6 to the connecting rod 3 and then to the ladder under test 2 through the connecting rod 3.

[0031] The hook 8 is arranged at the top end of the connecting rod 3 for hanging the ladder under test 2. The shape of the hook 8 can be set as a wide-mouth hook so as to be fully connected to the ladder under test 2.

[0032] The bracket 4 is arranged at the upper end of the base 9 for forming a support frame with a spanning span. The two ends of the ladder under test 2 are placed on the bracket 4. In this embodiment, the bracket 4 includes two vertical frames fixed to the base. The two vertical frames are arranged on both sides of the jack respectively, and a span is formed between the two vertical frames. The top ends of the two vertical frames are used for placing the ladder under test.

[0033] To provide adjustment ability, in a preferred embodiment, the vertical frame is fixed to the base 9 by a magnetic attraction method, so that the span of the two vertical frames can be adjusted to adapt to ladders of different sizes.

[0034] The dial indicator 1 is arranged at the top end of the bracket 4 for detecting the deformation displacement of the ladder under test 2. For accurate detection, two dial indicators 1 are provided, and one is arranged on each of the two vertical frames.

[0035] The working process is as follows:

[0036] 1. Base placement

[0037] Place the rigid base on the ground at the detection position.

[0038] 2. Place the jack

[0039] Place the hydraulic jack downward in the middle of the partition of the base, so that the jack piston is at the position of the circular hole of the partition, ensuring that the piston can extend and retract normally during pressurization.

[0040] 3. Set up the force transfer connecting rod to connect the ladder

[0041] Select a connecting rod of appropriate length according to the positions of the ladder and the jack. When the stroke is long, the connecting rod can be lengthened with a threaded sleeve. Hang the hooked end of the connecting rod at the middle force-bearing position of the ladder under test.

[0042] 4. Fix the jack clamp

[0043] Fix the connecting rod with the jack clamp. To ensure that the ladder is not affected by the weight of the connecting rod, keep a 2-mm gap between the hooked part and the ladder.

[0044] 5. Install the deformation support and zero the dial indicator

[0045] After adjusting the base and the connecting rod, install the magnetic deformation support and the dial indicator. The deformation support can be adjusted according to the size of the ladder to ensure that the dial indicator is in an effective position for measuring deformation.

[0046] 6. Pressurize with a hydraulic oil pump

[0047] Manually pressurize through the hydraulic oil pump, and the oil pressure jacks up the jack piston through the explosion-proof oil pipe.

[0048] 7. Observe the force value and deformation value

[0049] The jack exerts a downward pulling force on the ladder through the connecting rod. After reaching the designed pulling force value, observe whether there are cracks or other damages on the ladder, record the deformation value, and the test is completed.

[0050] Finally, it should be noted that: The above has made a detailed description of the preferred embodiments of this patent. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by ordinary technicians in the art, various changes can be made without departing from the gist of this patent.

Claims

1. A bending resistance test device for a manhole ladder, characterized in that: Including base, bracket, connecting rod, jack, dial indicator and hook; The base is used as a supporting structure, and the jack is installed in an inverted manner on the base. The jack is suspended relative to the base to provide a travel space for the jack to move downward; The bottom end of the connecting rod is connected to the movable end of the jack to transmit the downward driving force of the jack; The hook is arranged at the top end of the connecting rod and is used to hang the ladder to be tested; The bracket is arranged at the upper end of the base, and is used to form a support frame with a cross span, and the two ends of the ladder to be tested are mounted on the bracket; The micrometer is arranged at the top of the bracket and is used to detect the deformation displacement of the ladder under test.

2. The inspection well ladder bending test detection device according to claim 1 is characterized in that: The support comprises two upright frames fixed with bases, the two upright frames are arranged on both sides of the jack, a span is formed between the two upright frames, and the top ends of the two upright frames are used for setting up the ladder to be tested.

3. The inspection well ladder bending resistance test detection device according to claim 1 or 2 is characterized in that: The connecting rods are of connectable length, and adjacent connecting rods are connected via threaded sleeves.

4. The inspection well ladder bending resistance test detection device according to claim 3 is characterized in that: The connecting rod is a φ20mm-φ30mm threaded steel bar force transmission connecting rod.

5. The inspection well ladder bending resistance test detection device according to claim 2 is characterized in that: The stand and the base are fixed by magnetic attraction so that the span of the two stands is adjustable.

6. The inspection well ladder bending resistance test detection device according to claim 5 is characterized in that: The jack is a hydraulic jack.

7. The inspection well ladder bending resistance test detection device according to claim 6 is characterized in that: The jack is connected to a hydraulic manual oil pump through an explosion-proof oil pipe.

8. The inspection well ladder bending resistance test detection device according to claim 7 is characterized in that: The base is a rigid pedestal formed by welding steel plates, and support legs are arranged at the four corners of the base to form a suspended space.

9. The inspection well ladder bending resistance test detection device according to claim 8 is characterized in that: A 200mm high partition is welded at the center of the base for installing the jack, and a circular hole for passing a clamp is reserved in the middle of the partition for passing a connecting rod.

10. The inspection well ladder bending resistance test detection device according to claim 2 is characterized in that: Described micrometer is provided with two, and two vertical stands are respectively provided with one.

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