A reinforcing steel bar bending device for construction engineering quality detection

Abstract

The application discloses a reinforcing steel bar bending device for construction engineering quality detection, which comprises a tension machine and a lifting belt, the tension machine comprises a rack and a cross beam movably arranged on the rack, one clamping mechanism is arranged on the left side and the right side of the cross beam respectively, a sliding groove is arranged below the cross beam, two fixing bases are slidably arranged in the sliding groove, reinforcing steel bars can be arranged in the two fixing bases, the lifting belt lifts the reinforcing steel bars, and the two ends of the lifting belt pass through the gaps between the cross beam and the clamping plates on the two sides of the cross beam respectively. The lifting belt can better contact the reinforcing steel bars, and the actual stress conditions of the reinforcing steel bars in the concrete are restored, so that the data obtained is more practical and more persuasive.

Description

Technical Field

[0001] This invention relates to the field of steel bar quality testing technology, and in particular to a steel bar bending device for quality testing in construction engineering. Background Technology

[0002] Reinforcing bars refer to steel used in reinforced concrete and prestressed reinforced concrete. Their cross-section is circular, and sometimes square with rounded corners. They include plain round bars, ribbed bars, and twisted bars. Reinforcing bars are a crucial steel material for buildings, determining their strength. Therefore, the quality of reinforcing bars must be guaranteed, and bending tests must be conducted before use.

[0003] In existing technologies, bending tests of reinforcing bars are mostly conducted by applying pressure directly to the surface of the reinforcing bar using a press. However, in actual use, the stress on reinforcing bars is not concentrated at a single point. The actual stress point may be in the middle, at both ends, or evenly distributed throughout the reinforcing bar. Furthermore, since reinforcing bars are mostly cylindrical and embedded in concrete, the entire arc surface of the reinforcing bar is a stress area when subjected to pressure. In existing testing technologies, the stress method is changed from surface contact to line contact, which increases the pressure at the stress point of the reinforcing bar, resulting in less rigorous test results.

[0004] For example, Chinese utility model patent CN212083118U discloses a rebar bending device for quality testing in construction engineering, including a driving bending mechanism and a rebar fixing mechanism. The rebar fixing mechanism is fixedly connected to the left side of the top of the driving bending mechanism. The driving bending mechanism includes a first connecting shell. A transverse block is fixedly connected to the right side of the inner wall of the first connecting shell via a cylinder. The top of the transverse block penetrates the first connecting shell and extends to its outside, where a hydraulic rod is fixedly connected. A hydraulic device is provided on the side of the hydraulic rod for use with it, and a connecting block is fixedly connected to the top of the hydraulic rod. The force-bearing method of this device changes the surface contact to line contact, resulting in a significant difference between the tested performance of the rebar and its actual performance in use. Summary of the Invention

[0005] In view of this, the purpose of this invention is to address the shortcomings of the prior art by providing a rebar bending device for quality inspection in construction engineering. The device uses a lifting sling to better contact the rebar, thereby restoring the actual stress condition of the rebar in the concrete, and the resulting data is more practical and convincing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A rebar bending device for quality inspection in construction engineering includes a tensile testing machine and a lifting belt. The tensile testing machine includes a frame and a horizontal beam that can move up and down on the frame. A clamping mechanism is provided on each of the left and right sides of the horizontal beam. Each clamping mechanism includes a hole or slot on the upper surface of the horizontal beam, a gear disposed within the hole or slot, and a second hole on the side of the horizontal beam. The second hole penetrates the hole or slot. A stepped shaft is disposed within the second hole. The stepped shaft includes a shaft body, two journals respectively disposed at both ends of the shaft body, and two shaft ends respectively disposed at the ends of the two journals. The shaft body passes through the hole or slot and is connected to... The internal gears are connected and driven by a handwheel. Each end of the second hole has a bearing, which is fitted onto the journals at both ends. The two journals have threads with opposite directions. Each side of the crossbeam has a clamp plate with threaded holes. The two journals are threaded to the clamp plates on both sides. A slide groove is provided below the crossbeam, and two fixed seats are slidably installed in the slide groove. The reinforcing bars can be inserted into the two fixed seats. The lifting strap lifts the reinforcing bars, and the two ends of the lifting strap pass through the gap between the crossbeam and the clamp plates on both sides.

[0008] Furthermore, two clamping components are symmetrically arranged in the middle of the crossbeam. Each clamping component includes a support base, a screw, and a pressure rod. The bottom of the support base is fixed to the crossbeam, and the top of the support base is provided with an outwardly extending horizontal plate. A support is provided on the horizontal plate, and the screw passes through the support and is threadedly connected to it. The end of the horizontal plate is rotatably connected to the middle of the pressure rod. The bottom of the screw can contact the upper half of the pressure rod and push it to rotate. The lower end of the pressure rod can contact the outer end face of the clamping plate.

[0009] Furthermore, an extrusion plate is connected to the lower end of the pressure bar.

[0010] Furthermore, multiple conical protrusions are provided on both sides of the crossbeam and on the inner sides of the two clamping plates.

[0011] Furthermore, multiple lifting slings can be installed.

[0012] Furthermore, both fixed seats include a seat ring and a base. The seat ring is set on the base, and the steel bars pass through the seat rings of the two fixed seats. The base has a T-shaped structure, and the slide groove is a T-shaped slide groove. The base is set in the slide groove and slidably connected to it.

[0013] Furthermore, the handwheel drives the gears to rotate via the transmission gear set.

[0014] Furthermore, both shaft ends are equipped with anti-loosening thread caps.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention provides a rebar bending device for quality testing in construction engineering, comprising a tensile testing machine and a lifting belt. A clamping mechanism, consisting of a vertically movable crossbeam of the tensile testing machine and clamping plates on both sides, holds the two ends of the lifting belt. The rebar to be tested is lifted by the lifting belt to test its bending resistance. The lifting belt allows for better contact with the rebar, accurately reflecting the actual stress on the rebar within the concrete. A groove is provided below the crossbeam, within which two fixed seats slide. The rebar can be threaded through these fixed seats, and the position of the stress point on the rebar can be adjusted by changing the position of the two fixed seats. Two clamping members are symmetrically arranged in the middle of the crossbeam to increase the clamping force in the middle of the crossbeam, preventing the lifting belt from slipping due to reduced clamping force caused by excessive crossbeam length.

[0017] 2. The lower end of the pressure bar of this invention is connected to an extrusion plate to increase the contact area and prevent scratching the clamping plates. Multiple conical protrusions are provided on both sides of the crossbeam and the inner sides of the two clamping plates to increase friction and allow for a more secure clamping of the lifting straps. Multiple lifting straps can be provided to simulate the stress conditions of the reinforcing bars under different circumstances, increasing the variety of simulation quantities in the experiment. Both fixed seats include a seat ring and a base. The seat ring is set on the base, and the reinforcing bar passes through the seat ring of the two fixed seats. The base has a T-shaped structure, and the slide groove is a T-shaped slide groove. The base is slidably connected to the slide groove. Both the slide groove and the base are T-shaped structures, which can improve the structural strength of the fixed seats when lifting the reinforcing bar. The handwheel drives the gears to rotate through a transmission gear set. The transmission gear set can change the transmission ratio, reducing the torque required to rotate the handwheel. Anti-disengagement threaded caps are provided at the ends of both shaft heads to prevent the clamping plates on both sides from falling off. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of the crossbeam structure in this invention;

[0020] Figure 3 This is a top view of the crossbeam in this invention;

[0021] Figure 4 This is a schematic diagram of the clamping component in this invention;

[0022] Figure 5 This is a side sectional view of the crossbeam in this invention;

[0023] Figure 6 This is a schematic diagram of the stepped shaft in this invention;

[0024] Figure 7 This is a schematic diagram of the mating structure between the slide and the fixed base in Embodiment 1 of the present invention;

[0025] Figure 8This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0026] In the diagram: 1-Tension testing machine, 101-Frame, 102-Crossbeam, 2-Lifting belt, 3-Clamping mechanism, 301-Hole 1, 302-Gear, 303-Hole 2, 304-Stepped shaft, 3041-Shaft body, 3042-Junior journal, 3043-Shaft head, 305-Handwheel, 306-Bearing, 4-Clamping plate, 401-Threaded hole, 5-Slide groove, 6-Fixed seat, 601-Seat ring, 602-Base, 7-Reinforcing bar, 8-Pressure piece, 801-Support seat, 802-Screw rod, 803-Pressure rod, 804-Horizontal plate, 805-Support, 806-Extrusion plate, 9-Conical protrusion, 10-Transmission gear set, 11-Anti-loosening threaded cap. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Refer to Figures 1-7 The present invention provides a rebar bending device for quality testing in construction engineering, comprising a tensile testing machine 1 and a lifting belt 2. The lifting belt 2 allows for better contact with the rebar 7, accurately reflecting the actual stress state of the rebar 7 in concrete. The tensile testing machine 1 includes a frame 101 and a horizontal beam 102 that can move up and down on the frame 101. A clamping mechanism 3 is provided on each of the left and right sides of the horizontal beam 102. The clamping mechanism 3 includes a first hole 301 on the upper surface of the horizontal beam 102, a gear 302 disposed within the first hole 301, and a second hole 303 on the side of the horizontal beam 102. The second hole 303 penetrates the first hole 301, and a stepped shaft 304 is disposed within the second hole 303. The stepped shaft 304 includes a shaft body 3041 and gears respectively disposed on the shaft... The shaft body 3041 has two journals 3042 at both ends and two shaft heads 3043 respectively located at the ends of the two journals 3042. The shaft body 3041 passes through the hole 301 and is connected to the gear 302 inside it. The drive gear 302 will drive the stepped shaft 304 to rotate together. The gear 302 is driven by the handwheel 305. The handwheel 305 drives the gear 302 to rotate through the transmission gear set 10. The transmission gear set 10 can change the transmission ratio and reduce the torque required when rotating the handwheel 305.

[0029] Two bearings 306 are provided at each end of the second hole 303. The two bearings 306 are respectively sleeved on the journals 3042 at both ends. The two shaft ends 3043 are respectively provided with threads in opposite directions. A clamping plate 4 is provided on each side of the crossbeam 102. The clamping plate 4 has a threaded hole 401. The two shaft ends 3043 are respectively threaded to the clamping plates 4 on both sides through the threaded holes 401. Turning the handwheel 305 drives the gear 302 and the stepped shaft 304 to rotate together. When the shaft ends 3043 rotate, the two side clamping plates 4, which are threaded together with them, can only move towards or away from each other due to the opposite direction of their threads. Together with the side of the crossbeam 102, they form a clamping part, clamping the two ends of the lifting sling 2 between the two side clamping plates 4 and the crossbeam 102. Multiple conical protrusions 9 are provided on both sides of the crossbeam 102 and the inner sides of the two clamping plates 4 to increase friction and make the clamping plates 4 and the crossbeam 102 clamp the lifting sling 2 more firmly. The ends of the two shaft ends 3043 are provided with anti-loosening thread caps 11 to prevent the two side clamping plates 4 from falling off and to play a limiting role.

[0030] A slide groove 5 is provided below the crossbeam 102. Two fixed seats 6 are slidably installed in the slide groove 5. The position of the stress point of the reinforcing bar 7 can be adjusted by changing the position of the two fixed seats 6. Each fixed seat 6 includes a seat ring 601 and a base 602. The seat ring 601 is set on the base 602. The reinforcing bar 7 passes through the seat ring 601 of the two fixed seats 6. The base 602 has a T-shaped structure. The slide groove 5 is a T-shaped slide groove. The base 602 is set in the slide groove 5 and slidably connected to it. Both the slide groove 5 and the base 602 have T-shaped structures, which can improve the structural strength of the fixed seat 6 when lifting the reinforcing bar 7.

[0031] Two clamping members 8 are symmetrically arranged in the middle of the crossbeam 102 to increase the clamping force in the middle of the crossbeam 102 and prevent the lifting strap 2 from falling off due to the reduced clamping force caused by the excessive length of the crossbeam 102. Each clamping member 8 includes a support base 801, a screw 802, and a pressure rod 803. The bottom of the support base 801 is fixed to the crossbeam 102, and the top of the support base 801 is provided with an outwardly extending horizontal plate 804. A support 805 is provided on the horizontal plate 804, and the screw 802 passes through the support 805 and is threadedly connected to it. The end of the horizontal plate 804 is rotatably connected to the middle of the pressure rod 803. The bottom of the screw 802 can contact the upper half of the pressure rod 803 and push it to rotate. The lower end of the pressure rod 803 can contact the outer end face of the clamping plate 4. A pressing plate 806 is connected to the lower end of the pressure rod 803 to increase the contact area and prevent scratching the clamping plate 4.

[0032] The working principle of this embodiment is as follows:

[0033] First, insert the reinforcing bar 7 into the seat rings 601 of the two fixed seats 6. Adjust the distance between the two fixed seats 6 according to the area to be measured of the reinforcing bar 7. Then, lift the reinforcing bar 7 with the lifting sling 2. Pass the two ends of the lifting sling 2 through the gap between the two side clamps 4 and the crossbeam 102 from below. Then, turn the handwheel 305 to make the two side clamps 4 move towards each other until the two ends of the lifting sling 2 are firmly clamped. Then, turn the screw 802 of the clamping member 8 so that the bottom of the screw 802 contacts the upper half of the pressure rod 803 and pushes it to rotate. Under the action of force, the lower end of the pressure rod 803 drives the extrusion plate 806 to contact the outer end face of the clamp 4 and apply a fastening force to it, so that the clamp 4 and the middle of the crossbeam 102 are tightly attached together. After the fixation is completed, control the crossbeam 102 to move upward, and the lifting sling 2 drives the reinforcing bar 7 to exert force upward, so as to check the actual bending force of the reinforcing bar.

[0034] Example 2: Refer to Figure 8 The difference between Example 2 and Example 1 is that two lifting belts 2 are set. By adjusting the position of the two fixed seats 6, a tensile test is carried out on both ends of the steel bar 7 to simulate the stress on both ends of the steel bar 7.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A steel bar bending device for quality inspection in construction engineering, comprising a tensile testing machine (1) and a lifting belt (2), wherein the tensile testing machine (1) comprises a frame (101) and a crossbeam (102) mounted on the frame (101) and movable up and down, characterized in that: A clamping mechanism (3) is provided on each of the left and right sides of the crossbeam (102). The clamping mechanism (3) includes a hole (301) or groove on the upper surface of the crossbeam (102), a gear (302) disposed in the hole (301) or groove, and a hole (303) on the side of the crossbeam (102). The hole (303) passes through the hole (301) or groove. A stepped shaft (304) is disposed in the hole (303). The stepped shaft (304) includes a shaft body (3041), two journals (3042) respectively disposed at both ends of the shaft body (3041), and two shaft ends (3043) respectively disposed at the ends of the two journals (3042). The shaft body (3041) passes through the hole (301) or groove and is engaged with the gear (302) inside it. The gear (302) is connected to the gear by a handwheel ( 305) drive, each end of the second hole (303) is provided with a bearing (306), the two bearings (306) are respectively sleeved on the journals (3042) at both ends, the two shaft heads (3043) are respectively provided with threads of opposite direction, each side of the crossbeam (102) is provided with a clamping plate (4), the clamping plate (4) is provided with a threaded hole (401), the two shaft heads (3043) are respectively threaded to the clamping plates (4) on both sides through the threaded hole (401), a sliding groove (5) is provided below the crossbeam (102), two fixed seats (6) are slidably provided in the sliding groove (5), the reinforcing bar (7) can be passed through the two fixed seats (6), the lifting belt (2) lifts the reinforcing bar (7), and the two ends of the lifting belt (2) pass through the gap between the crossbeam (102) and the clamping plates (4) on both sides respectively.

2. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: Two clamping components (8) are symmetrically arranged in the middle of the crossbeam (102). Each clamping component (8) includes a support base (801), a screw (802), and a pressure rod (803). The bottom of the support base (801) is fixed on the crossbeam (102). The top of the support base (801) is provided with an outwardly extending horizontal plate (804). A support (805) is provided on the horizontal plate (804). The screw (802) passes through the support (805) and is threadedly connected to it. The end of the horizontal plate (804) is rotatably connected to the middle of the pressure rod (803). The bottom of the screw (802) can contact the upper half of the pressure rod (803) and push it to rotate. The lower end of the pressure rod (803) can contact the outer end face of the clamping plate (4).

3. The steel bar bending device for quality inspection of building engineering according to claim 2, characterized in that: The lower end of the pressure bar (803) is connected to an extrusion plate (806).

4. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: Multiple conical protrusions (9) are provided on both sides of the crossbeam (102) and on the inner sides of the two clamping plates (4).

5. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: Multiple lifting straps (2) are provided.

6. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: Both fixed seats (6) include a seat ring (601) and a base (602). The seat ring (601) is disposed on the base (602). The reinforcing bar (7) passes through the seat ring (601) of the two fixed seats (6). The base (602) is a T-shaped structure. The slide groove (5) is a T-shaped slide groove. The base (602) is disposed in the slide groove (5) and slidably connected to it.

7. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: The handwheel (305) drives the gear (302) to rotate through the transmission gear set (10).

8. The steel bar bending device for quality inspection of building engineering according to claim 1, characterized in that: Both ends of the two shaft heads (3043) are provided with anti-loosening thread caps (11).

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