CN111380759B - Reinforced concrete beam compression bending moment measurement loading method and loading tool - Google Patents
Reinforced concrete beam compression bending moment measurement loading method and loading tool Download PDFInfo
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- CN111380759B CN111380759B CN202010098278.2A CN202010098278A CN111380759B CN 111380759 B CN111380759 B CN 111380759B CN 202010098278 A CN202010098278 A CN 202010098278A CN 111380759 B CN111380759 B CN 111380759B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
Abstract
The invention relates to a reinforced concrete beam compression bending moment measurement loading method, which loads reinforced concrete in a four-point supporting mode. The reinforced concrete beam compression bending moment measurement loading tool comprises a suspension rail, a suspension rail part lifting cylinder, a pressure sensor, a bridge plate and two support piers, wherein the suspension rail part lifting cylinder is suspended on the suspension rail in a sliding mode, the pressure sensor is connected onto the suspension rail part lifting cylinder, the bridge plate is suspended on the suspension rail part cylinder through a suspension frame, the two support piers are located below the bridge plate, a sliding rail is arranged on each support pier, a supporting seat is connected onto each sliding rail in a sliding mode, two ends of each bridge plate are respectively provided with a pressing block, the pressure sensor is located right above the middle portion of each bridge plate, and the lower portion of the middle portion of each bridge plate is connected with a plumb through a lifting rope. The invention has the advantage of applying load to the reinforced concrete beam to be detected, and solves the problem of inconvenience in measuring the compression bending moment of the reinforced concrete beam due to the lack of a device for applying load to the reinforced concrete beam.
Description
Technical Field
The invention relates to the technical field of concrete member detection, in particular to a loading method and a loading tool for measuring the compression bending moment of a reinforced concrete beam.
Background
The structure is consolidated and is reformed transform and have important meaning to city extension, nevertheless to existing building structure consolidation and transformation have the risk higher, new technology many, manage and control characteristics such as difficulty. Therefore, the diagnosis and monitoring of the stress working state of the member by using technical means in the design and construction are problems which need to be faced and solved urgently by related engineering personnel. At present, some relevant research documents for determining the stress state of concrete by using the ultrasonic wave speed have been published at home and abroad, but due to the nonlinear material characteristics of concrete, the methods are feasible only when the compressive stress is within the range of 30-40% of the ultimate compressive strength. The method is used for measuring the compression bending moment of the reinforced concrete beam based on the wave velocity and the crack width, when the compression bending moment of the reinforced concrete beam is measured, a downward pressing load is required to be applied to the middle of the reinforced concrete beam to simulate the load of the reinforced concrete beam, two ultrasonic transducers distributed along the reinforced concrete beam are installed on the upper side of the reinforced concrete beam to perform detection, two ultrasonic transducers distributed along the reinforced concrete beam are installed on the lower side of the reinforced concrete beam to perform detection, and then the compression bending moment of the reinforced concrete beam is calculated according to the applied load and the wave velocity sound energy measured by the ultrasonic transducers. But because the corresponding frock is lacked and the load is exerted to the reinforced concrete crossbeam that treats the measuring to it is inconvenient when leading to carrying out the compression moment of flexure measurement.
Disclosure of Invention
The invention provides a load application method for measuring the compression bending moment of a reinforced concrete beam, which is used for applying load to the reinforced concrete beam to be detected.
The invention provides a reinforced concrete beam compression bending moment measurement loading tool for loading a reinforced concrete beam to be detected, and solves the problem that the compressed bending moment of the reinforced concrete beam is inconvenient to measure due to the lack of a device for loading the reinforced concrete beam.
The technical problem is solved by the following technical scheme: a load application method for measuring the compression bending moment of a reinforced concrete beam is characterized in that reinforced concrete is loaded in a four-point supporting mode.
The utility model provides a reinforced concrete crossbeam pressurized bending moment measurement loading frock, includes along the front and back side that left and right directions extends hang the rail that the spout is equipped with, front and back both sides one-to-one ground sliding connection is two be equipped with the suspension loop on the piston rod that suspension block, cylinder body in the spout link together with suspension block and hang the rail portion lift cylinder of hanging, connect the pressure sensor on hanging the piston rod of rail portion lift cylinder, overlap and establish the mounted frame that hangs through suspension loop on hanging the piston rod of rail portion lift cylinder, connect on the mounted frame and lie in the bridge slab that extends along left and right directions of pressure sensor below and lie in the bridge slab below along two piers that distribute along left and right directions, form the passageway between two piers, be equipped with the slide rail that extends along left and right directions on the pier, sliding connection has the supporting seat on the slide rail, the both ends of bridge slab respectively are equipped with one and press the briquetting, pressure sensor is located directly over the middle part of bridge slab, the below the middle part of bridge slab is connected with the plumb through the lifting rope. When the device is used, the two ends of the reinforced concrete beam are supported on the two supporting seats, the end parts of the reinforced concrete beam are aligned with the end parts of the supporting seats, and then the middle point of the reinforced concrete beam is aligned with the hammer by sliding the supporting seats and/or the suspension seats. Two ultrasonic transducers in the 4 ultrasonic transducers are fixed on the upper side surface of the reinforced concrete beam, and the other two ultrasonic transducers are fixed on the lower side surface of the reinforced concrete beam; and then the suspension seat telescopic cylinder extends to enable the bridge plate to be supported on the reinforced concrete beam through the pressing blocks, then the suspension seat telescopic cylinder presses the bridge plate through the pressure sensor along with the further extension of the suspension seat telescopic cylinder, the bridge plate conducts the pressure to the reinforced concrete beam through the two pressing blocks, and the suspension seat telescopic cylinder stops increasing the pressure when the force displayed by the pressure sensor meets the requirement, so that the reinforced concrete beam is loaded. The technical scheme can conveniently load the middle part of the reinforced concrete beam to a required value, and the reinforced concrete beam and the bridge plate can move and are conveniently centered at first. And the plumb is arranged, so that whether centering is performed or not can be conveniently known.
Preferably, a flexible isolation pad for pressing the bridge plate is connected to the pressure sensor. Damage to the pressure sensor can be avoided.
Preferably, when the stay cable is straightened and the suspension bracket is suspended on the suspension ring, the lower end of the plumb bob is lower than the lower end of the pressing block; the plumb is in a conical shape with a small lower end and a large upper end, and a supporting ring for supporting the plumb is arranged on the bridge plate; when the plumb bob is arranged in the supporting ring in a penetrating mode, the lower end of the plumb bob is higher than the lower end of the pressing block. During centering, only make the plummet just with the contact of reinforced concrete crossbeam and be convenient for observe the plummet with drawing at the reinforced concrete crossbeam and make the central line align this moment, and press the briquetting and be disconnected with the reinforced concrete crossbeam this moment for laborsaving also can not be to pressing the briquetting damage this moment when relative movement reinforced concrete crossbeam and bridge plate. When pressing the briquetting and pressing the reinforced concrete crossbeam and carry out the loading, shelve the plummet on the filler ring, can avoid the plummet to collide with reinforced concrete and lead to damaging and interfering the transducer work.
The ultrasonic transducer lifting fixing mechanism comprises a flat belt along the left-right direction, two support cylinders arranged at two ends of the flat belt and an upward telescopic flat belt lifting cylinder for driving the flat belt to lift, two downward telescopic bridge plate lifting cylinders distributed along the left-right direction are arranged on the bridge plate, and the bridge plate lifting cylinder is connected with the ultrasonic transducer. When in use, one ultrasonic transducer is also arranged in each of the two support cylinders. After the centering is finished, the flat belt is driven to ascend through the flat belt part lifting cylinder so that the two ultrasonic transducers in the two support cylinders are fixed on the lower surface of the reinforced concrete beam. And the total two ultrasonic transducers on the two bridge plate part lifting cylinders are fixed on the upper side surface of the reinforced concrete beam through the extension of the bridge plate part lifting cylinders. The four transducers can be conveniently fixed on the upper surface and the lower surface of the reinforced concrete beam at set distances in each measurement. The convenience in measurement is improved. The force when ultrasonic transducer installs can conveniently adjust.
Preferably, the suspension rail is provided with an alignment mark, and the suspension block is provided with a pointer matched with the alignment mark; when the pointer is aligned with the alignment mark, the 2 ultrasonic transducers are aligned with the 2 support cylinders in a one-to-one correspondence manner. Whether 2 ultrasonic transducers on the upper side and the lower side are aligned in a one-to-one correspondence mode can be conveniently obtained. The convenience in detection is good.
Preferably, a deformation avoiding mechanism is arranged on the lower side of the flat belt and comprises a sliding sleeve, a sliding block, a connecting rod and a spring, wherein the upper end of the sliding sleeve is connected with the flat belt and is open downwards, the sliding block is connected in the sliding sleeve in a sliding mode, the upper end of the connecting rod is connected with the lower end of the sliding block, the spring is located in the sliding sleeve, the lower end of the connecting rod is connected with the flat belt lifting cylinder, the sliding sleeve is supported on the sliding block through the spring, and a ventilating cavity is isolated in the sliding sleeve through the sliding block. When loading in-process, when a plurality of reinforced concrete crossbeams produced decurrent deformation, can dodge through the shrink of spring and ultrasonic transducer on the spot for though fix through pressing, also have unsettled effect of fixing on the reinforced concrete crossbeam, and can not interfere the production of deformation and influence the accuracy that detects.
Preferably, the pressing block comprises a lower half part and an upper half part which are overlapped together, a brush is arranged on the lower surface of the upper half part, and a brush avoiding pit for accommodating the brush is arranged on the upper surface of the lower half part; the suspension rail part lifting cylinder is a double-stroke cylinder; when the suspension rail part lifting cylinder extends for a stroke and the lower half part is removed, the suspension bracket is suspended on the suspension ring and the hairbrush is in contact with the upper surface of the reinforced concrete beam supported on the supporting seat; when the suspension rail part lifting cylinder is in a contraction state and the lower half part is removed, the suspension bracket is suspended on the suspension ring and the hairbrush is disconnected with the upper surface of the reinforced concrete beam supported on the supporting seat; the pressing block is supported on the upper surface of the reinforced concrete beam supported on the supporting seat through the lower half part, and when two strokes of the suspension rail part lifting cylinder are extended, the suspension bracket is separated from the suspension ring. When the suspension seat is used, the suspension seat telescopic cylinder is in a contraction state to perform centering. After centering is completed, the suspension rail part lifting cylinder extends out for a stroke and removes the lower half part, then the suspension block moves left and right, and the part where the ultrasonic transducer is to be installed is cleaned through the hairbrush, so that the reliability in detection is improved. Finally, the two strokes of the telescopic cylinder of the suspension seat part extend so as to load.
Preferably, the lower surface of the upper half part is provided with a positioning convex strip extending along the front-back direction, the brush is connected to the positioning convex strip, and the width of the positioning convex strip is equal to the width of the brush avoiding pit; when the positioning convex strips penetrate through the brush avoiding pits, the lower half parts of the two pressing blocks are symmetrically distributed on the two radial sides of the suspension rail part lifting cylinder. The pressing positions of the pressing blocks which are assembled together and kept pressed are symmetrically distributed on two sides of the telescopic cylinder of the suspension seat part, so that the resultant force acts in the middle of the resultant force of the reinforced concrete.
Preferably, the lower end of the positioning convex strip is provided with a leading-in section with a wider upper end and a narrower lower end. The lower half section and the upper half section are convenient to close.
Preferably, the two pressing blocks are symmetrically distributed on two radial sides of the suspension rail part lifting cylinder. The accuracy of the detection result is good.
Preferably, the supporting seat is provided with a supporting roller, an annular groove extending along the circumferential direction of the supporting roller is formed in the circumferential surface of the supporting roller, and the sliding rail penetrates through the annular groove and is supported below the supporting roller. When the reinforced concrete beam is translated, the abrasion between the supporting seat and the sliding rail is small, and the movement is labor-saving and smooth.
Preferably, the lower surface of the suspension block is provided with a plurality of supporting rolling balls which are distributed along the left-right direction and supported on the lower side surface of the sliding chute. When the bridge plate is moved, the abrasion between the suspension seat and the sliding groove is small, and the movement is labor-saving and smooth.
Preferably, one end of the supporting seat, which is far away from the channel, is provided with a side stop. The alignment of the end parts of the same supporting seat is realized through the butt connection of the baffle plates at the same side when the reinforced concrete beam is supported on the supporting seat, and the alignment is convenient.
The invention has the following advantages: the reinforced concrete beam to be detected can be conveniently and reliably loaded, so that the convenience in measuring the compression bending moment of the reinforced concrete beam is improved, and the centering is convenient.
Drawings
FIG. 1 is a schematic front view of the present invention as soon as a reinforced concrete beam has been laid thereon according to an embodiment of the present invention;
FIG. 2 is an enlarged partial schematic view of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic view illustrating a pair of reinforced concrete beams during cleaning according to the embodiment.
FIG. 5 is a schematic view illustrating a pair of reinforced concrete cross members to which a load is applied according to an embodiment.
Fig. 6 is a schematic diagram of a jacking fixing mechanism of an ultrasonic transducer in the second embodiment.
In the figure: the device comprises a suspension rail 1, a suspension block 2, a suspension rail part lifting cylinder 3, a pressure sensor 4, a suspension bracket 5, a bridge plate 6, a support pier 7, a sliding chute 8, an upper side wall 9 of the sliding chute, an alignment mark 10, a pointer 11, a support rolling ball 16, a suspension ring 12, a flexible isolation pad 13, a suspension plate 14, a connecting claw 15, a lower half part 17, an upper half part 18, a positioning convex strip 19, a guide-in section 20, a brush 21, a brush avoiding pit 22, a lifting rope 23, a plumb bob 24, a backing ring 25, a bridge plate part lifting cylinder 26, an ultrasonic transducer 27, a channel 28, a sliding rail 29, a support seat 30, a side stop block 31, a support roller 32, a flat belt 33, a backing cylinder 34, a flat belt part lifting cylinder 45, a sliding sleeve 36, a sliding block 37, a connecting rod 38, a spring 39, a cavity 40, a reinforced concrete beam 41, a base 42, a motor 43, an eccentric wheel 44, a power output shaft 46 of the motor, a guide rod 47, a guide sleeve 48 and a pressing block 49.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
First embodiment, referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a reinforced concrete beam compression bending moment measurement loading tool comprises a suspension rail 1, a suspension block 2, a suspension rail lifting cylinder 3, a pressure sensor 4, a suspension frame 5, a bridge plate 6 and two support piers 7. The suspension rail extends in the left-right direction. The front and rear side surfaces of the suspension rail are provided with sliding grooves 8 extending in the left-right direction. The front surface of the upper side wall 9 of the chute is provided with alignment marks 10. The alignment mark is a scale line extending in the up-down direction. The front side and the rear side of the suspension block are in one-to-one corresponding sliding connection in the two sliding grooves. The upper end of the hanging block is provided with a pointer 11 matched with the alignment mark. The lower surface of the suspension block is provided with a plurality of supporting rolling balls 16 which are distributed along the left-right direction and supported on the lower side surface of the chute. The pointer is located in front of the sliding groove on the front side surface of the suspension rail. The suspension rail part lifting cylinder is a double-stroke cylinder. The cylinder body of the lifting cylinder of the suspension rail part is connected with the suspension block. A piston rod of the lifting cylinder of the suspension rail part is provided with a suspension ring 12. The pressure sensor is connected to the lower end face of a piston rod of the suspension rail part lifting cylinder. The pressure sensor is connected with a flexible isolating pad 13 for pressing the bridge plate. The pressure sensor is positioned right above the middle position of the bridge plate. The hanger comprises hanger plates 14 and 2 connecting grips 15. The suspension plate is sleeved on a piston rod of the suspension rail part lifting cylinder. The suspension plate is positioned above the suspension ring, and the suspension frame is pressed on the suspension ring and suspended on a piston rod of the suspension rail part lifting cylinder. And 2, the connecting claws are distributed on the two radial sides of the lifting cylinder of the suspension rail part. The upper end of the connecting grab is connected with the suspension plate, and the lower end of the connecting grab is connected with the bridge plate. The bridge plate extends in the left-right direction. Two ends of the bridge plate are respectively provided with a pressing block 49. The pressing block comprises a lower half 17 and an upper half 18, which are superimposed. The lower surface of the upper half is provided with positioning convex strips 19 extending in the front-rear direction. The lower end of the positioning convex strip is provided with a leading-in section 20 with a wide upper end and a narrow lower end. The lower surface of the introduction section is provided with a brush 21. The upper surface of the lower half part is provided with a brush avoiding pit 22 for accommodating brushes. The width of the positioning convex strips is equal to that of the brush avoiding concave pits, and the width direction is the left-right direction in the figure 5. When the positioning convex strips are arranged in the brush avoiding concave pits in a penetrating mode, the lower half portions of the two pressing blocks are symmetrically distributed on the two radial sides of the hanging rail portion lifting air cylinder.
A plumb 24 is connected to the lower part of the middle part of the bridge plate through a lifting rope 23. The plumb bob is in a conical shape with a small lower end and a big upper end. When the suspension rail part lifting cylinder is in a contraction state, namely two strokes are all contracted in place, the bridge plate is suspended on a piston rod of the suspension rail part lifting cylinder through a suspension bracket matched with a suspension block, and at the moment, the lower end of the plumb bob is straightened by the stay cable and is lower than the lower end surface of the pressing block, namely the lower half part. The bridge plate is provided with a supporting ring 25 for supporting the plumb bob. When the plumb bob is arranged in the supporting ring in a penetrating way, the lower end of the plumb bob is higher than the lower end of the pressing block. The bridge plate is provided with two downward telescopic bridge plate part lifting cylinders 26 distributed along the left and right directions. The bridge plate part lifting cylinder is connected with an ultrasonic transducer 27. Two ultrasonic transducer symmetric distribution on two bridge plate portion lift cylinders are in the radial both sides that hang rail portion lift cylinder, and this mode of setting can improve the convenience when aliging. The two support piers are positioned below the bridge plate. The two support piers are distributed along the left and right direction. 2 form a channel 28 between the two abutments. The support pier is provided with a slide rail 29 extending in the left-right direction. The slide rail is connected with a supporting seat 30 in a sliding way. The end of the support base away from the channel is provided with a side stop 31. The concrete connection mode of supporting seat and slide rail does: the slide rail has two, and the supporting seat is equipped with 2 supporting rollers 32 along fore-and-aft direction distribution, is equipped with the ring channel that extends along supporting roller circumference on supporting roller's global, and 2 slide rails wear to establish in the ring channel of two supporting rollers and support in supporting roller's below one-to-one. An ultrasonic transducer jacking and fixing mechanism is arranged in the channel. The ultrasonic transducer jacking and fixing mechanism comprises a flat belt 33 extending along the left-right direction, two support cylinders 34 arranged at two ends of the flat belt and an upward telescopic flat belt part lifting cylinder 45 driving the flat belt to lift. The flat belt part lifting cylinder is connected with the flat belt through a deformation avoiding mechanism. The deformation avoiding mechanism comprises a sliding sleeve 36 with the upper end connected with the flat belt and a downward opening, a sliding block 37 connected in the sliding sleeve in a sliding mode, a connecting rod 38 with the upper end connected with the lower end of the sliding block and a spring 39 positioned in the sliding sleeve. The lower end of the connecting rod is connected with a piston rod of the flat belt lifting cylinder. The cylinder body of the flat belt part lifting cylinder is connected on the base 42. The sliding sleeve is supported on the sliding block through a spring. The slider separates a gas permeable cavity 40 within the sleeve. When the pointer is aligned with the alignment mark, 2 ultrasonic transducers connected to the bridge plate are aligned with 2 supporting cylinders in a one-to-one correspondence manner.
In an initial state, the flat belt part lifting cylinder and the suspension rail part lifting cylinder are in a contraction state to avoid, the pointer is aligned with the alignment mark, and the lower half part is removed from the upper half part. When in use, one ultrasonic transducer is also inserted into each of the two support cylinders. Two ends of the reinforced concrete beam 41 are supported on two supporting seats, the end parts of the reinforced concrete beam are abutted with the same side baffle plates, then the supporting seats are slid to align the midpoint of the reinforced concrete beam (marking is carried out on the midpoint of the reinforced concrete beam by drawing lines) with the hammer, and the hammer is placed on the supporting ring after the alignment. And then the suspension rail part lifting cylinder extends for a stroke, at the moment, the suspension bracket is suspended on the suspension ring, the hairbrush is contacted with the upper surface of the reinforced concrete beam on the supporting seat, the pressing block is contacted with the reinforced concrete beam only through the hairbrush, the suspension block is moved left and right, and therefore the part to be contacted with the ultrasonic transducer on the upper surface of the reinforced concrete beam is cleaned through the hairbrush. After cleaning, the pointer is aligned with the alignment mark and the suspension rail part lifting cylinder is contracted, the lower half part is folded to the upper half part, two strokes of the suspension rail part lifting cylinder are extended to enable the pressing block to be pressed onto the reinforced concrete beam (at the moment, the bridge plate is placed on the upper side surface of the reinforced concrete beam and is not hung on the suspension ring, namely, the suspension plate and the suspension ring are separated), the suspension seat part telescopic cylinder presses the bridge plate through a pressure sensor, the bridge plate part lifting cylinder drives two ultrasonic transducers above the reinforced concrete beam to be pressed onto the upper side surface of the reinforced concrete beam, the flat belt part lifting cylinder is extended to enable the two ultrasonic transducers on the supporting cylinder to be pressed onto the lower side surface of the reinforced concrete beam, air pressure is continuously added to the suspension seat part telescopic cylinder to increase the load on the upper side surface of the reinforced concrete beam, and when the force displayed by the pressure sensor meets the requirement, the suspension seat part telescopic cylinder stops increasing the pressure, and loading of the reinforced concrete beam is completed.
The second embodiment is different from the first embodiment in that:
referring to fig. 6, a flat belt lifting mechanism for driving the flat belt to lift is provided to replace a flat belt lifting cylinder, the flat belt lifting mechanism comprises a motor 43 and an eccentric wheel 44 connected to a power output shaft 46 of the motor, the eccentric wheel supports the flat belt through the peripheral surface, the flat belt is connected with a guide sleeve 48 sleeved on a guide rod 47, and the guide rod and the motor are fixed together. Specifically, the method comprises the following steps: the guide sleeve is connected to the sliding sleeve to achieve connection with the flat belt, the connecting rod and the rotating shaft of the eccentric wheel are located on the same vertical plane, the connecting rod is supported on the peripheral face of the eccentric wheel to achieve support of the deformed wheel to the flat belt, and the guide rod and the motor are fixed on the base to achieve relative fixation. If the deformation avoiding mechanism is not arranged, the guide sleeve is directly connected to the flat belt, and the peripheral surface of the deformation wheel is directly supported on the lower surface of the flat belt to be connected. When the lifting device is used, the motor drives the eccentric wheel to rotate so as to realize the lifting of the flat belt, and the lifting of the flat belt is completed under the action of gravity when the deformation wheel rotates to generate avoidance.
Claims (7)
1. A load-applying tool for measuring the compression bending moment of a reinforced concrete beam is characterized by comprising a suspension rail, suspension blocks, a suspension rail part lifting cylinder, a pressure sensor, a suspension frame, a bridge plate and two support piers, wherein the suspension rail is provided with sliding grooves on the front side and the rear side, the sliding grooves are formed in the front side and the rear side, the suspension blocks are connected into the two sliding grooves in a sliding manner, the front side and the rear side of the suspension rail part lifting cylinder are connected with the suspension blocks in a one-to-one correspondence manner, a suspension ring is arranged on a piston rod of the suspension rail part lifting cylinder, the cylinder body is connected with the suspension blocks together, the pressure sensor is connected with the piston rod of the suspension rail part lifting cylinder through the suspension ring, the suspension frame is sleeved on the piston rod of the suspension rail part lifting cylinder and is suspended through the suspension ring, the bridge plate is connected with the suspension frame and is positioned below the pressure sensor and extends along the left and right direction, the two support piers are positioned below the bridge plate and distributed along the left and right direction, a channel is formed between the two support piers, the support piers are provided with slide rails extending along the left and right directions, the slide rail is connected with a supporting seat in a sliding way, two ends of the bridge plate are respectively provided with a pressing block, the pressure sensor is positioned right above the middle part of the bridge plate, the lower part of the middle part of the bridge plate is connected with a load-applying tool for measuring the compression bending moment of the lead reinforced concrete beam through a lifting rope, and the load-applying tool also comprises an ultrasonic transducer jacking and fixing mechanism positioned in the channel, the ultrasonic transducer jacking and fixing mechanism comprises a flat belt extending along the left-right direction, two support cylinders arranged at the two ends of the flat belt and an upward telescopic flat belt part lifting cylinder for driving the flat belt to lift, two downward telescopic lifting cylinders of the bridge plate part are arranged on the bridge plate and distributed along the left and right directions, the lifting cylinders of the bridge plate part are connected with ultrasonic transducers, the pressing block comprises a lower half part and an upper half part which are overlapped together, a brush is arranged on the lower surface of the upper half part, and a brush avoiding pit for accommodating the brush is arranged on the upper surface of the lower half part; the suspension rail part lifting cylinder is a double-stroke cylinder; when the suspension rail part lifting cylinder extends for a stroke and the lower half part is removed, the suspension bracket is suspended on the suspension ring and the hairbrush is in contact with the upper surface of the reinforced concrete beam supported on the supporting seat; when the suspension rail part lifting cylinder is in a contraction state and the lower half part is removed, the suspension bracket is suspended on the suspension ring and the hairbrush is disconnected with the upper surface of the reinforced concrete beam supported on the supporting seat; and the pressing block is supported on the upper surface of the reinforced concrete beam on the supporting seat through the lower half part, and when two strokes of the lifting cylinder of the suspension rail part extend, the suspension bracket is separated from the suspension ring.
2. The reinforced concrete beam compression bending moment measurement loading tool according to claim 1, wherein when the stay cable is straightened and the suspension bracket is suspended on the suspension ring, the lower end of the plumb bob is lower than the lower end of the pressing block; the plumb is in a conical shape with a small lower end and a large upper end, and a supporting ring for supporting the plumb is arranged on the bridge plate; when the plumb bob is arranged in the supporting ring in a penetrating mode, the lower end of the plumb bob is higher than the lower end of the pressing block.
3. The reinforced concrete beam compression bending moment measurement loading tool according to claim 1, wherein an alignment mark is arranged on the suspension rail, and a pointer matched with the alignment mark is arranged on the suspension block; when the pointer is aligned with the alignment mark, 2 ultrasonic transducers are aligned with 2 supporting cylinders in a one-to-one correspondence mode.
4. A reinforced concrete beam compression bending moment measurement loading tool according to claim 1, wherein the lower side of the flat belt is provided with a deformation avoiding mechanism, the deformation avoiding mechanism comprises a sliding sleeve with an upper end connected with the flat belt and an opening downward, a sliding block connected in the sliding sleeve in a sliding manner, a connecting rod with an upper end connected with the lower end of the sliding block, and a spring located in the sliding sleeve, the lower end of the connecting rod is connected with the flat belt lifting cylinder, the sliding sleeve is supported on the sliding block through the spring, and the sliding block is isolated from a ventilating cavity in the sliding sleeve.
5. The reinforced concrete beam compression bending moment measurement loading tool according to claim 1, wherein a positioning convex strip extending in the front-rear direction is arranged on the lower surface of the upper half part, the hairbrush is connected to the positioning convex strip, and the width of the positioning convex strip is equal to the width of the hairbrush avoiding concave pit; when the positioning convex strips penetrate through the brush avoiding pits, the lower half parts of the two pressing blocks are symmetrically distributed on the two radial sides of the suspension rail part lifting cylinder.
6. The reinforced concrete beam compression bending moment measurement loading tool according to claim 5, wherein the lower end of the positioning convex strip is provided with a guide-in section with a wide upper end and a narrow lower end.
7. The reinforced concrete beam compression bending moment measurement loading tool according to claim 1, wherein the two pressing blocks are symmetrically distributed on two radial sides of the suspension rail part lifting cylinder.
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| CN202210724573.3A CN115144273A (en) | 2020-02-18 | 2020-02-18 | Reinforced concrete beam compression bending moment measurement loading method |
| CN202010098278.2A CN111380759B (en) | 2020-02-18 | 2020-02-18 | Reinforced concrete beam compression bending moment measurement loading method and loading tool |
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| CN111380759A (en) | 2020-07-07 |
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