Device and method for detecting four-point bending and tensile properties of UHPC (Ultra High Performance Concrete) sheet pile

Abstract

The invention discloses a UHPC sheet pile four-point bending and tensile property detection device and method, and relates to the field of building material detection equipment.The UHPC sheet pile four-point bending and tensile property detection device comprises two sliding grooves, the sliding grooves are fixedly connected to the outer sides of four supporting columns, and a fixed cross beam is fixedly connected to the tops of the sliding grooves; a first motor is fixedly connected to the top of the fixed cross beam, a motor cover is arranged on the outer side of the first motor, the motor cover is fixedly connected to the top of the fixed cross beam, two lifting columns are slidably connected to the inner side of the fixed cross beam, and racks are fixedly connected to the inner sides of the lifting columns; the output ends of the two sides of the first motor are fixedly connected with straight gears, and the straight gears are engaged with the racks. The specific performance value of the UHPC sheet pile of the original specification which is actually put into use can be completely and truly reflected, the detection result error is reduced, and adverse consequences and economic losses caused by wrong judgment of construction workers on reasonable application of the UHPC sheet pile are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of building material testing equipment, and in particular to a device and method for testing four-point bending and tensile properties of UHPC sheet piles. Background Art

[0002] UHPC sheet piles are made of ultra-high performance concrete as the main material through a specific process. They have high strength, high durability, high toughness and good working performance. Their shapes and sizes can be customized and their connection methods are diverse. They are a new type of building component widely used in engineering fields such as construction, bridges, water conservancy, and municipal engineering.

[0003] UHPC sheet piles are widely used because of their many advantages such as high strength, high durability, high toughness, convenient construction, environmental protection and economy, which can effectively improve project quality, reduce long-term costs and adapt to various complex environments. When a large number of UHPC sheet piles are in use, in order to detect whether the same batch of UHPC sheet piles are qualified, it is necessary to use a device and method for detecting the four-point bending and tensile properties of UHPC sheet piles.

[0004] However, the existing detection devices and methods for the four-point bending and tensile properties of UHPC sheet piles have the following shortcomings:

[0005] At present, there is no specific testing device on the market that can simultaneously test the quality of both four-point bending and tensile properties of UHPC sheet piles, and the only testing device with a single testing function can only perform clamping testing on UHPC sheet piles of a specific size. As a result, in order to test UHPC sheet piles, UHPC sheet piles can only be made according to the specified size. The test results can only detect the quality of raw materials and the quality of production methods of the same batch of UHPC sheet piles, and cannot truly reflect the specific performance values ​​of the original specifications of UHPC sheet piles actually put into use, resulting in large errors in the test results, which can easily cause construction workers to make wrong judgments on the reasonable application of UHPC sheet piles, resulting in adverse consequences and economic losses.

[0006] Therefore, we proposed a detection device and method for the four-point bending and tensile properties of UHPC sheet piles in order to solve the problems raised above. Summary of the invention

[0007] When inspectors carry out UHPC sheet pile inspection, they first stick the resistance strain gauge and extensometer to the appropriate position of the sheet pile. Then, with the help of a crane, they move the inspection device to the side of the UHPC sheet pile to be inspected. Then, they start the first motor, which drives the gear to rotate. The gear and rack cooperate with each other to drive the lifting column to move upward. The shovel plate installed on the lifting column rises accordingly, and the UHPC sheet pile is lifted steadily to be higher than the horizontal plane where the bottom loading point is located. The second motor in the sliding groove is turned on, and the motor drives the first bidirectional threaded rod fixed to it to rotate. The two sliding beams threadedly connected to the threaded rod slide toward the middle along the sliding groove under the action of thread transmission. According to the specifications of the UHPC sheet pile to be inspected, the operator adjusts the sliding beams on both sides and the bottom loading points fixed on them to the standard test position, starts the hydraulic support legs, and lets them descend until they contact the ground, providing stable support for the sliding beams and the bottom loading point.

[0008] To achieve the above object, the present invention provides the following technical solution: a detection device for four-point bending and tensile properties of UHPC sheet piles, comprising a pillar and a triangular beam, a lifting mechanism is provided on the outer side of the pillar, a clamping mechanism is provided on the inner side of the lifting mechanism, a bending pressure mechanism is provided on the top of the pillar, and a protective mechanism is provided on the inner side of the lifting mechanism;

[0009] The lifting mechanism is installed on the outside of the four pillars and is used to lift the UHPC sheet piles by itself without manual placement, thereby improving the quality and speed of inspection;

[0010] The clamping mechanism is installed on the inner side of the lifting mechanism and is used to fix the UHPC sheet pile when performing tensile testing on the UHPC sheet pile, so as to prevent the UHPC sheet pile from sliding during testing and reduce the possibility of fracture at the contact point with the clamp, thereby affecting the normal tensile data;

[0011] The bending pressure mechanism is installed on the top of the triangular beam and is used to apply pressure to the UHPC sheet pile when performing a four-point bending test on the UHPC sheet pile.

[0012] Preferably, the lifting includes two sliding grooves, the sliding grooves are fixedly connected to the outsides of the four pillars, the top of the sliding grooves is fixedly connected to a fixed beam, the top of the fixed beam is fixedly connected to a first motor, a motor cover is provided on the outside of the first motor, the motor cover is fixedly connected to the top of the fixed beam, two lifting columns are slidably connected to the inside of the fixed beam, a rack is fixedly connected to the inside of the lifting column, spur gears are fixedly connected to the output ends on both sides of the first motor, the spur gears are meshed with the rack, and a shovel plate is fixedly connected to the bottom of the lifting column.

[0013] Preferably, the clamping mechanism includes a sliding beam, the sliding beam is slidably connected to the inner side of the sliding groove, the top of the sliding beam is fixedly connected to a bottom loading point, the inner two ends of the sliding beam are respectively provided with a first bidirectional threaded rod and a sliding rod, the sliding beam is threadedly connected to the first bidirectional threaded rod, the sliding rod is slidably connected to the sliding beam, the outer side of the first bidirectional threaded rod is fixedly connected to a second motor, the second motor is fixedly connected to the inside of the sliding groove, the first bidirectional threaded rod and the two ends of the sliding rod are respectively fixedly connected to the sliding beams on both sides, the bottom of the sliding beam is fixedly connected to a mounting beam, the outer side of the mounting beam is fixedly connected to two first fixed telescopic rods, the other ends of the two first fixed telescopic rods are fixedly connected to a support plate, and the support plate The inner side is rotatably connected to two connecting rotating rods, the outer sides of the two connecting rotating rods are rotatably connected to clamping claws, the outer sides of the two clamping claws are slidably connected to multiple advanced pull plates, the outer sides of the multiple advanced pull plates are fixedly connected to an integrated board, the top of the integrated board is fixedly connected to a first force sensor, the other side of the integrated board is fixedly connected to two second fixed telescopic rods, the other ends of the two second fixed telescopic rods are fixedly connected to the mounting beam, the interior of the mounting beam is fixedly connected to a pressure cylinder, the other end of the pressure cylinder is fixedly connected to the integrated board, the outer side of the pressure cylinder is fixedly connected to two first laser displacement sensors, the inner sides of the two clamping claws are fixedly connected to multiple reset springs, and the bottom of the mounting beam is fixedly connected to two hydraulic support legs.

[0014] Preferably, the bending pressure mechanism includes a top beam, which is fixedly connected to the top of the triangular beam, a hydraulic cylinder is fixedly connected to the inner side of the top beam, the hydraulic cylinder passes through the triangular beam, a hammer plate is fixedly connected to the bottom of the hydraulic cylinder, two top loading points are slidably connected to the inner side of the hammer plate, a limiting rod is slidably connected to the inner side of the two top loading points, a third motor is fixedly connected to the top of the hammer plate, a second bidirectional threaded rod is fixedly connected to the inner side of the third motor, the second bidirectional threaded rod is threadedly connected to the other end of the two top loading points, a second laser displacement sensor is fixedly connected to the bottom of the hammer plate, and the top of the hammer plate is fixedly connected to the second force sensor.

[0015] Preferably, the protective mechanism includes a base plate, the base plate is fixedly connected to the inner sides of the two sliding grooves, the inner side of the base plate is fixedly connected to a cylinder bin, the interior of the cylinder bin is fixedly connected to an electric telescopic rod, the top of the electric telescopic rod is fixedly connected to a top rod, the bottom of the top plate is fixedly connected to two canvas curtains, and the other ends of the two canvas curtains are fixedly connected to the base plate.

[0016] Preferably, heavy machine wheels are provided at the bottom of the four pillars, the top loading point and the bottom loading point are composed of a plurality of closely fitting loading plates, a plurality of heat dissipation holes are provided on the outer side of the motor cover, and the triangular beam is fixedly connected to the top of the pillar.

[0017] Preferably, the clamping claw is slidably connected to the advanced pull plate through an advanced sliding groove opened on the inner side, and a rotatable hard rubber clamp with a frosted surface is fixed to the claw tip of the clamping claw.

[0018] Preferably, an operator is fixedly connected to the outer side of the sliding slot, a signal receiving display screen is arranged on the outer side of the operator, and the signal receiving display screen is fixedly connected to the sliding slot.

[0019] Preferably, a plurality of circular rings are fixed to the top of the base plate, and the canvas curtain is fixedly connected to the base plate via the circular rings.

[0020] The method for using the detection device for the four-point bending and tensile properties of UHPC sheet piles comprises the following steps:

[0021] Step 1: First, start the first motor to drive the lifting column to lift the UHPC sheet pile. When performing the four-point bending test, lift the UHPC sheet pile belt to above the horizontal plane of the bottom loading point. When performing the tensile performance test, lift the UHPC sheet pile belt to within the clamping range of the clamping claws of the clamping mechanisms on both sides;

[0022] Step 2: When performing a four-point bending test, the sliding beams on both sides and the bottom loading point are brought to the standard test position according to the specifications of the UHPC sheet pile to be tested by the second motor, and then the hydraulic support legs fixed by the mounting beams on both sides are started until each hydraulic support leg is in contact with the ground and level. Then the top loading points on both sides are driven by the third motor to adjust the standard test position, and then the hammer plate and the top loading point are driven downward by the hydraulic cylinder until they contact the UHPC sheet pile to be tested. Then the hydraulic cylinder is started again to start testing the UHPC sheet pile. The multi-sensor data needs to be collected synchronously to ensure the correlation between load, deformation and strain, improve the analysis accuracy, and complete the test;

[0023] Step 3: When starting the tensile performance test, the UHPC sheet pile belt is raised to between the clamping claws on the clamping mechanisms on both sides by the lifting column, and then the clamping claws on both sides are brought to the range that can clamp the UHPC sheet pile by the second motor again. After that, the pressure cylinder drives the clamping claws to clamp the UHPC sheet pile through the sliding relationship between the advanced pull plate and the clamping claws, and then the force sensor, displacement sensor and extensometer are synchronously turned on to record the test data, and then the pressure cylinder is continued to be started to apply force to the UHPC sheet pile until it is broken, and the test is completed;

[0024] Step 4: During each test, the canvas is lifted and unfolded by activating the electric telescopic rod to prevent the UHPC sheet pile from being deformed or broken and splashing small stones during the test.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. When testing UHPC sheet piles, the test personnel first attach the resistance strain gauge and the extensometer, use a crane to move the device to the sheet pile, and the first motor drives the rack and the lifting column through the gear, and uses the shovel plate to lift the UHPC sheet pile to the horizontal plane of the bottom loading point, and then start the second motor in the sliding groove, and drive the two sliding beams threaded with it to slide along the sliding groove toward the middle through the fixed first bidirectional threaded rod, until the sliding beams on both sides and the bottom loading point fixed thereon are brought to the standard test position according to the specifications of the UHPC sheet pile to be tested, and then start the hydraulic support legs to descend to the ground to support the sliding beams and the bottom loading point, and drive the hammer plate and top loading plate fixed at the bottom by the hydraulic cylinder. The load point moves downward until it contacts the UHPC sheet pile to be tested, and then the hydraulic cylinder is started to test the UHPC sheet pile. The load is measured by the second sensor, the deflection is measured by the second laser displacement sensor, and the strain is measured in combination with the strain gauge. Data is collected synchronously. During the tensile test, the sheet pile is lifted between the clamping claws, the second motor is initially adjusted, and the pressure cylinder drives the clamping. The first force sensor, the first displacement sensor and the extensometer sensor record the test, and the force is applied to break the sheet pile to complete the test. At this point, the specific performance values ​​of the original specifications of the UHPC sheet piles actually put into use can be fully and truly reflected, the error of the test results can be reduced, and the construction workers can avoid making wrong judgments on the reasonable application of UHPC sheet piles, which may cause adverse consequences and economic losses.

[0027] 2. In the process of testing UHPC sheet piles by the equipment of the present invention, since the sheet piles may be broken due to the testing force, the splashed cement slag and gravel are very likely to accidentally injure the surrounding test personnel. Therefore, a bottom plate is fixed on the inner side of the sliding groove, and the bottom plate is closely connected with the electric telescopic rod by means of a cylinder bin. Before the testing operation is started, the electric telescopic rod is started, which will drive the top rod fixed thereto to move upward, thereby unfolding the pre-installed sail. When the UHPC sheet piles are broken during the testing, the splashed cement slag and other debris will be effectively blocked by the raised and unfolded canvas, which greatly reduces the risk of injury to the test personnel. At the same time, this design has an additional benefit. When the testing work is carried out outdoors, the unfolded canvas can block the sunlight, avoid direct exposure of the tested UHPC sheet piles to the sunlight, and prevent the physical properties of the sheet piles from changing due to excessive temperature, thereby ensuring the accuracy and reliability of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1It is a main structural stereogram of the device and method for detecting four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0029] Figure 2 It is a structural split stereogram of the detection device and method for four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0030] Figure 3 This is a disassembled stereoscopic diagram of the lifting mechanism in the detection device and method for the four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0031] Figure 4 This is a disassembled diagram of the clamping mechanism in the detection device and method for the four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0032] Figure 5 It is a structural exploded stereogram of the bending pressure mechanism in the detection device and method for the four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0033] Figure 6 It is a partially exploded three-dimensional diagram of the structure of the protection mechanism in the detection device and method for the four-point bending and tensile properties of UHPC sheet piles of the present invention;

[0034] Figure 7 It is a front view of the detection device and method for four-point bending and tensile properties of UHPC sheet piles of the present invention.

[0035] Figure 8 It is a top view of the detection device and method for four-point bending and tensile properties of UHPC sheet piles of the present invention.

[0036] In the figure: 1, pillar; 2, protection mechanism; 201, bottom plate; 202, cylinder bin; 203, electric telescopic rod; 204, top rod; 205, canvas curtain; 3, lifting mechanism; 301, sliding groove; 302, fixed beam; 303, first motor; 304, motor cover; 305, lifting column; 306, rack; 307, spur gear; 308, shovel plate; 4, clamping mechanism; 401, sliding beam; 402, bottom loading point; 403, first bidirectional threaded rod; 404, second motor; 405, sliding rod; 406, mounting beam; 407, hydraulic support leg; 408, first fixed telescopic rod; 409, Support plate; 410, connecting rotating rod; 411, clamping claw; 412, advanced pulling plate; 413, integrated board; 414, second fixed telescopic rod; 415, pressure cylinder; 416, reset spring; 417, first laser displacement sensor; 418, first force sensor; 5, bending pressure mechanism; 501, top beam; 502, hydraulic cylinder; 503, hammer plate; 504, top loading point; 505, third motor; 506, limit rod; 507, second force sensor; 508, second laser displacement sensor; 209, second bidirectional threaded rod; 6, heavy machine wheel; 7, operator; 8, signal receiving display screen; 9, triangular beam. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1, according to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a detection device for four-point bending and tensile properties of UHPC sheet piles comprises a pillar 1 and a triangular beam. A lifting mechanism 3 is provided on the outer side of the pillar 1, a clamping mechanism 4 is provided on the inner side of the lifting mechanism 3, a bending pressure mechanism 5 is provided on the top of the pillar 1, and a protective mechanism 2 is provided on the inner side of the lifting mechanism 3. The lifting mechanism 3 is installed on the outer side of the four pillars 1 and is used to lift the UHPC sheet piles by themselves without manual placement, thereby improving the detection quality and speed. The clamping mechanism 4 is installed on the inner side of the lifting mechanism 3 and is used to fix the UHPC sheet piles when performing tensile testing on the UHPC sheet piles, so as to prevent the UHPC sheet piles from sliding during testing and reduce the situation where the UHPC sheet piles are broken at the contact with the clamps and affect the normal tensile data. The bending pressure mechanism 5 is installed on the top of the triangular beam. It is used to apply pressure to the UHPC sheet piles when performing four-point bending detection on the UHPC sheet piles. The lifting includes two sliding grooves 301, the sliding grooves 301 are fixedly connected to the outside of the four pillars 1, the top of the sliding grooves 301 is fixedly connected to the fixed beam 302, the top of the fixed beam 302 is fixedly connected to the first motor 303, the outside of the first motor 303 is provided with a motor cover 304, the motor cover 304 is fixedly connected to the top of the fixed beam 302, the inner side of the fixed beam 302 is slidably connected to two lifting columns 305, the inner side of the lifting column 305 is fixedly connected to a rack 306, the output ends on both sides of the first motor 303 are fixedly connected to spur gears 307, the spur gears 307 are meshed with the rack 306, and the bottom of the lifting column 305 is fixedly connected to a shovel plate 308.

[0039] The effect achieved by the entire embodiment 1 is as follows: when testing the UHPC sheet pile, the tester first sticks the resistance strain gauge and the extensometer on the surface of the UHPC sheet pile sample, and then starts the crane wheel 6 through the operator 7 to move the testing device to the UHPC sheet pile to be tested. Since the spur gears 307 are fixed to the output ends of the third motor 505 on the fixed beam 302 on both sides, and the spur gears 307 are meshed with the rack 306 on the lifting column 305, after starting the first motor 303, the lifting column 305 will rise with the shovel plate 308 thereon to lift the UHPC sheet pile.

[0040] Embodiment 2, according to Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the clamping mechanism 4 includes a sliding beam 401, which is slidably connected to the inner side of the sliding groove 301, and the top of the sliding beam 401 is fixedly connected to the bottom loading point 402, and the first two-way threaded rod 403 and the sliding rod 405 are respectively provided at the two ends of the inner side of the sliding beam 401, the sliding beam 401 is threadedly connected to the first two-way threaded rod 403, and the sliding rod 405 is slidably connected to the sliding beam 401, and the outer side of the first two-way threaded rod 403 is fixedly connected to the second motor 404, and the second motor 404 is fixedly connected to the inside of the sliding groove 301, and the two ends of the first two-way threaded rod 403 and the sliding rod 405 are respectively fixedly connected to the sliding beams 401 on both sides, and the bottom of the sliding beam 401 is fixedly connected to the mounting beam 406.

[0041] The effect achieved by the entire embodiment 2 is as follows: in the four-point bending detection link, the second laser displacement sensor 508 at the bottom of the hammer plate 503 plays a key role. The non-contact measurement technology captures the dynamic changes in the displacement of the sample during the force process, and accurately determines the deflection of the sample in the span. The external resistance strain gauge is also pasted on the surface of the UHPC sheet pile sample. By virtue of its own characteristics, it cleverly converts the strain of the sample into resistance change, and then measures the strain distribution on the surface of the sample in detail, especially the strain information of the key part of the pure bending moment area. In order to ensure the high quality of the detection data, the multi-sensor data is integrated in a synchronous acquisition manner, so that the load, deformation and strain are closely related, and the accuracy of the analysis is comprehensively improved.

[0042] Embodiment 3, according to Figure 2 , Figure 7 and Figure 8 As shown, two first fixed telescopic rods 408 are fixedly connected to the outer side of the mounting beam 406, and the other ends of the two first fixed telescopic rods 408 are fixedly connected to a support plate 409, and the inner side of the support plate 409 is rotatably connected to two connecting rotating rods 410, and the outer sides of the two connecting rotating rods 410 are both rotatably connected to clamping claws 411, and the outer sides of the two clamping claws 411 are slidably connected to multiple advanced pull plates 412, and the outer sides of the multiple advanced pull plates 412 are fixedly connected to an integrated board 413, and the top of the integrated board 413 is fixedly connected to a first force sensor 418, Two second fixed telescopic rods 414 are fixedly connected to the other side of the integrated board 413, and the other ends of the two second fixed telescopic rods 414 are fixedly connected to the mounting beam 406. A pressure cylinder 415 is fixedly connected to the inside of the mounting beam 406, and the other end of the pressure cylinder 415 is fixedly connected to the integrated board 413. Two first laser displacement sensors 417 are fixedly connected to the outer side of the pressure cylinder 415, and a plurality of return springs 416 are fixedly connected to the inner sides of the two clamping claws 411. Two hydraulic support legs 407 are fixedly connected to the bottom of the mounting beam 406.

[0043] The effect achieved by the entire embodiment 3 is as follows: when starting the UHPC sheet pile tensile performance test process, the lifting column 305 is first operated to lift the UHPC sheet pile to a predetermined height and accurately deliver it to the area corresponding to the clamping claws 411 of the clamping mechanism 4 on both sides, and the second motor 404 is started, and the clamping claws 411 on both sides begin to move and gradually adjust their positions until they reach the optimal spacing range that can just firmly clamp the UHPC sheet pile. The pressure cylinder 415 is started, and with the help of the bucket-shaped slide sliding connection structure between the advanced pull plate 412 and the clamping claw 411, the power is accurately transmitted, driving the clamping claw 411 to fit closely to the UHPC sheet pile, thereby achieving reliable clamping of the sheet pile, and laying a solid foundation for the subsequent accurate tensile performance test.

[0044] Embodiment 4, according to Figure 2 , Figure 5 , Figure 7 and Figure 8 As shown, the bending pressure mechanism 5 includes a top beam 501, which is fixedly connected to the top of the triangular beam, a hydraulic cylinder 502 is fixedly connected to the inner side of the top beam 501, and the hydraulic cylinder 502 penetrates the triangular beam, and a hammer plate 503 is fixedly connected to the bottom of the hydraulic cylinder 502, and two top loading points 504 are slidably connected to the inner side of the hammer plate 503, and the inner sides of the two top loading points 504 are slidably connected to the limit rod 506, and the top of the hammer plate 503 is fixedly connected to a third motor 505, and the inner side of the third motor 505 is fixedly connected to a second bidirectional threaded rod 209, and the second bidirectional threaded rod 209 is threadedly connected to the other ends of the two top loading points 504, and the bottom of the hammer plate 503 is fixedly connected to a second laser displacement sensor 508, and the top of the hammer plate 503 is fixedly connected to a second force sensor 507. The protection mechanism 2 includes a bottom plate 201, which is fixedly connected to the inner sides of the two sliding grooves 301, and the inner side of the bottom plate 201 is fixedly connected to a cylinder bin 202, and the air An electric telescopic rod 203 is fixedly connected to the inside of the cylinder warehouse 202, and a top rod 204 is fixedly connected to the top of the electric telescopic rod 203. Two canvas curtains 205 are fixedly connected to the bottom of the top plate, and the other ends of the two canvas curtains 205 are fixedly connected to the bottom of the bottom plate 201. Heavy machine wheels 6 are arranged at the bottom of the four pillars 1. The top loading point 504 and the bottom loading point 402 are both composed of a plurality of closely fitting loading plates. A plurality of heat dissipation holes are provided on the outside of the motor cover 304. The triangular beam is fixedly connected to the top of the pillar 1. The clamping claw 411 is slidably connected to the advanced pull plate 412 through the advanced slide groove provided on the inside. The claw of the clamping claw 411 is slightly fixed with a rotatable frosted hard rubber splint. An operator 7 is fixedly connected to the outside of the sliding groove 301. A signal receiving display screen 8 is provided on the outside of the operator 7. The signal receiving display screen 8 is fixedly connected to the sliding groove 301. A plurality of circular rings are fixed to the top of the bottom plate 201, and the canvas curtain 205 is fixedly connected to the bottom plate 201 through the circular rings.

[0045] The effect achieved by the entire embodiment 4 is as follows: when the inspection work is about to begin, the operator only needs to start the electric telescopic rod 203 to drive the top rod 204 fixed thereto to move steadily upward. As the top rod 204 rises, the canvas curtain 205 unfolds. When the UHPC sheet pile is unfortunately broken during the inspection process, the cement slag that splashes out instantly will be tightly blocked by the raised and fully unfolded canvas curtain 205, greatly reducing the possibility of injury to the inspectors.

[0046] The working principle of the whole equipment is as follows: when it is necessary to inspect the UHPC sheet pile, the inspection personnel firstly stick the resistance strain gauge and the extensometer on the surface of the UHPC sheet pile sample for use, and start the dynamic crane wheel 6 through the operator 7 to move the device of the present invention to the UHPC sheet pile to be inspected. Since the output ends of the third motor 505 on both sides of the fixed crossbeam 302 are fixed with spur gears 307, and the spur gears 307 are meshed with the rack 306 on the lifting column 305, the first motor 303 is started to drive the lifting column 305 and the shovel plate 308 on the lifting column 305 to lift the UHPC sheet pile. When the four-point bending inspection is required, the UHPC sheet pile belt is lifted to above the horizontal plane of the bottom loading point 402, and then the sliding groove 301 is started. The second motor 404 drives the two sliding beams 401 threaded with the first bidirectional threaded rod 403 to slide along the sliding groove 301 toward the middle, until the sliding beams 401 on both sides and the bottom loading points 402 fixed thereon are brought to the standard test position according to the specifications of the UHPC sheet pile to be tested, and then the hydraulic support legs 407 fixed by the mounting beams 406 fixed at the bottom of the sliding beams 401 on both sides are started, until each hydraulic support leg 407 is in contact with the ground and is level, and then the third motor 505 is started, and through the fixed second bidirectional threaded rod 209, the top loading points 504 on both sides are driven to move to the standard test position by threaded connection, and the hydraulic cylinder 502 is turned on to drive the hammer plate 503 fixed at the bottom and the top loading point 502 fixed thereon to move to the standard test position, and then ... support legs 407 fixed by the mounting beams 406 fixed at the bottom of the sliding beams 401 on both sides are turned on, and then the hydraulic support legs 407 fixed by the mounting beams 406 fixed at the bottom of the sliding beams 401 on both sides are turned on, and then the hydraulic support legs 407 fixed by the mounting beams 406 fixed thereon are turned on, and then the hydraulic support legs 407 fixed by the mounting beams 406 fixed thereon are turned on, and then the hydraulic support legs 407 fixed by the mounting beams 406 fixed thereon are turned on, and then the hydraulic support legs 407 fixed by the mounting beam 04 moves downward until it touches the UHPC sheet pile to be tested, and then continues to start the hydraulic cylinder 502 to start testing the UHPC sheet pile. The second sensor on the hammer plate 503 and the first force sensor 418 on the integrated board 413 convert mechanical force into electrical signals based on the piezoelectric effect and the piezoresistive effect, measure the bending load applied to the specimen, and record the maximum destructive load. The second laser displacement sensor 508 at the bottom of the hammer plate 503 captures the displacement change in a non-contact manner, measures the deflection in the span of the specimen, and cooperates with the external resistance strain gauge to be pasted on the surface of the UHPC sheet pile specimen to convert the strain into resistance change, measure the strain distribution on the surface of the specimen and the strain in the pure bending moment area, and collect the multi-sensor data synchronously to ensure the load, The correlation between deformation and strain improves the analysis accuracy and completes the test. When conducting the tensile performance test, the UHPC sheet pile belt is lifted to the clamping range of the clamping claws 411 of the clamping mechanism 4 on both sides by the lifting column 305. When the tensile performance test starts, the UHPC sheet pile belt is lifted to between the clamping claws 411 on the clamping mechanism 4 on both sides by the lifting column 305, and then the clamping claws 411 on both sides are brought to the range that can clamp the UHPC sheet pile by the second motor 404 again. The pressure cylinder 415 then drives the clamping claws 411 to clamp the UHPC sheet pile through the sliding relationship between the advanced pull plate 412 and the clamping claws 411. The first fixed telescopic rods 408 and the second fixed telescopic rods 414 on both sides are non-electric and hydraulic, and will not generate resistance to affect the test data.At this time, the force sensor, displacement sensor and extensometer are simultaneously turned on to record the test data, and then the pressure cylinder 415 is started to apply force to the UHPC sheet pile until it is broken, completing the test.

[0047] During the inspection of UHPC sheet piles, the UHPC sheet piles may break due to the inspection, resulting in splashing cement slag and gravel that may accidentally injure the inspectors. Therefore, a bottom plate 201 is fixed on the inner side of the sliding groove 301. The bottom plate 201 is fixed to the electric telescopic rod 203 through a cylinder bin 202. When the electric telescopic rod 203 is started, the top rod 204 fixed thereto is driven to rise, and the canvas curtain 205 is driven to unfold. When the UHPC sheet piles are inspected, the cement slag splashed by the break is blocked by the raised and unfolded canvas, reducing the risk of injury to the construction workers. At the same time, it can reduce the exposure of the inspected UHPC sheet piles to sunlight when working outdoors, resulting in excessive temperature of the UHPC sheet piles and affecting the test data.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The detection device for four-point bending and tensile properties of UHPC sheet piles is characterized by: It comprises a support (1) and a triangular beam (9), wherein a lifting mechanism (3) is provided on the outer side of the support (1), a clamping mechanism (4) is provided on the inner side of the lifting mechanism (3), a bending pressure mechanism (5) is provided on the top of the support (1), and a protective mechanism (2) is provided on the inner side of the lifting mechanism (3); The lifting mechanism (3) is installed on the outside of the four pillars (1) and is used to lift the UHPC sheet piles by themselves without manual placement, thereby improving the quality and speed of inspection; The clamping mechanism (4) is installed on the inner side of the lifting mechanism (3) and is used to fix the UHPC sheet pile when performing a tensile test on the UHPC sheet pile, so as to prevent the UHPC sheet pile from sliding during the test and reduce the possibility of fracture at the contact point with the clamp, thereby affecting the normal tensile data; The bending pressure mechanism (5) is installed on the top of the triangular beam (9) and is used to apply pressure to the UHPC sheet pile when performing a four-point bending test on the UHPC sheet pile.

2. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 1 is characterized in that: The lifting device comprises two sliding grooves (301), wherein the sliding grooves (301) are fixedly connected to the outer sides of the four pillars (1), the top of the sliding grooves (301) is fixedly connected to a fixed beam (302), the top of the fixed beam (302) is fixedly connected to a first motor (303), a motor cover (304) is arranged on the outer side of the first motor (303), the motor cover (304) is fixedly connected to the top of the fixed beam (302), two lifting columns (305) are slidably connected to the inner side of the fixed beam (302), the inner side of the lifting column (305) is fixedly connected to a rack (306), both sides of the output end of the first motor (303) are fixedly connected to a spur gear (307), the spur gear (307) is meshed with the rack (306), and the bottom of the lifting column (305) is fixedly connected to a shovel plate (308).

3. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 2 is characterized in that: The clamping mechanism (4) comprises a sliding beam (401), wherein the sliding beam (401) is slidably connected to the inner side of the sliding groove (301), the top of the sliding beam (401) is fixedly connected to a bottom loading point (402), and the inner ends of the sliding beam (401) are respectively provided with a first bidirectional threaded rod (403) and a sliding rod (405), the sliding beam (401) is threadedly connected to the first bidirectional threaded rod (403), the sliding rod (405) is slidably connected to the sliding beam (401), and the first bidirectional threaded rod (403) is fixedly connected to the bottom loading point (402). The outer side of the second motor (404) is fixedly connected, the second motor (404) is fixedly connected to the inside of the sliding groove (301), the first bidirectional threaded rod (403) and the two ends of the sliding rod (405) are respectively fixedly connected to the sliding beams (401) on both sides, the bottom of the sliding beam (401) is fixedly connected to a mounting beam (406), the outer side of the mounting beam (406) is fixedly connected to two first fixed telescopic rods (408), the other ends of the two first fixed telescopic rods (408) are fixedly connected to a support plate (409), the The inner side of the support plate (409) is rotatably connected to two connecting rotating rods (410), and the outer sides of the two connecting rotating rods (410) are rotatably connected to clamping claws (411), and the outer sides of the two clamping claws (411) are slidably connected to multiple advanced pull plates (412), and the outer sides of the multiple advanced pull plates (412) are fixedly connected to an integrated board (413), and the top of the integrated board (413) is fixedly connected to a first force sensor (418), and the other side of the integrated board (413) is fixedly connected to two second fixed telescopic rods (414), and the two The other end of the second fixed telescopic rod (414) is fixedly connected to the mounting beam (406), a pressure cylinder (415) is fixedly connected inside the mounting beam (406), the other end of the pressure cylinder (415) is fixedly connected to the integrated board (413), two first laser displacement sensors (417) are fixedly connected to the outer side of the pressure cylinder (415), a plurality of return springs (416) are fixedly connected to the inner sides of the two clamping claws (411), and two hydraulic support legs (407) are fixedly connected to the bottom of the mounting beam (406).

4. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 3 is characterized in that: The bending pressure mechanism (5) comprises a top beam (501), wherein the top beam (501) is fixedly connected to the top of the triangular beam (9), a hydraulic cylinder (502) is fixedly connected to the inner side of the top beam (501), the hydraulic cylinder (502) passes through the triangular beam (9), a hammer plate (503) is fixedly connected to the bottom of the hydraulic cylinder (502), the inner side of the hammer plate (503) is slidably connected to two top loading points (504), and the inner sides of the two top loading points (504) are slidably connected to the A limit rod (506) is connected, the top of the hammer plate (503) is fixedly connected to a third motor (505), the inner side of the third motor (505) is fixedly connected to a second bidirectional threaded rod (209), the second bidirectional threaded rod (209) is threadedly connected to the other ends of the two top loading points (504), the bottom of the hammer plate (503) is fixedly connected to a second laser displacement sensor (508), and the top of the hammer plate (503) is fixedly connected to a second force sensor (507).

5. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 4 is characterized in that: The protection mechanism (2) comprises a bottom plate (201), the bottom plate (201) being fixedly connected to the inner sides of the two sliding grooves (301), the inner side of the bottom plate (201) being fixedly connected to a cylinder bin (202), the interior of the cylinder bin (202) being fixedly connected to an electric telescopic rod (203), the top of the electric telescopic rod (203) being fixedly connected to a top rod (204), the bottom of the top plate being fixedly connected to two canvas curtains (205), the other ends of the two canvas curtains (205) being fixedly connected to the bottom plate (201).

6. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 5, characterized in that: The bottoms of the four pillars (1) are each provided with a heavy machine wheel (6); the top loading point (504) and the bottom loading point (402) are each composed of a plurality of tightly fitted loading plates; the outer side of the motor cover (304) is provided with a plurality of heat dissipation holes; and the triangular beam is fixedly connected to the top of the pillar (1).

7. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 6, characterized in that: The clamping claw (411) is slidably connected to the advanced pull plate (412) via an advanced sliding groove provided on the inner side, and a rotatable hard rubber clamping plate with a frosted surface is fixed to the claw of the clamping claw (411).

8. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 7, characterized in that: An operator (7) is fixedly connected to the outside of the sliding slot (301), a signal receiving display screen (8) is arranged on the outside of the operator (7), and the signal receiving display screen (8) is fixedly connected to the sliding slot (301).

9. The detection device for four-point bending and tensile properties of UHPC sheet piles according to claim 8, characterized in that: A plurality of circular rings are fixed on the top of the bottom plate (201), and the canvas curtain (205) is fixedly connected to the bottom plate (201) via the circular rings.

10. The method for using the detection device for four-point bending and tensile properties of UHPC sheet piles is characterized by: The device for detecting four-point bending and tensile properties of a UHPC sheet pile according to claim 9 comprises the following steps: S1: First, the first motor (303) is started to drive the lifting column (305) to lift the UHPC sheet pile. When performing a four-point bending test, the UHPC sheet pile belt is lifted to a level above the bottom loading point (402). When performing a tensile performance test, the UHPC sheet pile belt is lifted to within the clamping range of the clamping claws (411) of the clamping mechanisms (4) on both sides. S2: When performing a four-point bending test, the sliding beams (401) on both sides and the bottom loading point (402) are brought to the standard test position according to the specifications of the UHPC sheet pile to be tested by the second motor (404), and then the hydraulic support legs (407) fixed by the mounting beams (406) on both sides are started until each hydraulic support leg (407) is in contact with the ground and is level, and then the top loading points (504) on both sides are driven by the third motor (505) to adjust the standard test position, and then the hammer plate (503) and the top loading point (504) are driven to move downward by starting the hydraulic cylinder (502) until they contact the UHPC sheet pile to be tested, and then the hydraulic cylinder (502) is started again to start testing the UHPC sheet pile, and the multi-sensor data needs to be collected synchronously to ensure the correlation between load, deformation and strain, improve the analysis accuracy, and complete the test; S3: When the tensile property test begins, the UHPC sheet pile belt is lifted to between the clamping claws (411) on the clamping mechanisms (4) on both sides by the lifting column (305), and then the clamping claws (411) on both sides are brought to the range where the UHPC sheet pile can be clamped by the second motor (404). Then, the pressure cylinder (415) drives the clamping claws (411) to clamp the UHPC sheet pile through the sliding relationship between the advanced pulling plate (412) and the clamping claws (411), and then the force sensor, displacement sensor and extensometer are synchronously turned on to record the test data, and then the pressure cylinder (415) is continuously started to apply force to the UHPC sheet pile until it is broken, thereby completing the test; S4: During each test, the canvas is lifted and unfolded by starting the electric telescopic rod (203) to prevent the UHPC sheet pile from being deformed or broken and splashing small stones during the test.

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