CN115615848A - A prestressed steel impact protection test device and test method - Google Patents

Abstract

The invention provides a prestressed reinforcement impact protection test device and a test method, which comprise the following steps: the positioning mechanism is provided with a fixing mechanism, the positioning mechanism and the fixing mechanism are both connected with the steel bar assembly, and the fixing mechanism is connected with a testing mechanism; the fixing mechanism comprises a fixing shell, the side end of the fixing shell is contacted with the thread block, fixing cavities are arranged at the upper end and the lower end of the fixing shell in a penetrating mode, the fixing shell is fixedly connected with the force application block, a through hole is arranged at one end, far away from the force application block, of the fixing shell in a penetrating mode, and the through hole is communicated with the fixing cavities; through the load to the application of force piece, simulation impact load can transmit the reinforcing bar with load through the set casing, has solved present prestressing steel bar impact protection test and has adopted the reinforcing bar to draw the experiment usually, and the reinforcing bar is drawn mostly for static loading, and in the actual conditions, the reinforcing bar can bear impact load, and draw experimental research very few technical problem to reinforcing bar under the impact load.

Description

A prestressed steel impact protection test device and test method

technical field

The invention relates to the technical field of impact protection tests, in particular to a prestressed steel bar impact protection test device and a test method.

Background technique

Threaded steel bars for prestressed concrete, also known as finish-rolled threaded steel bars, are widely used in prestressed concrete bridge structures, such as cable-stayed bridge cable tower anchorage areas, concrete box girders and other parts. In order to make the concrete structure meet the design crack resistance requirements, construction It is necessary to apply a high level of elastic potential energy to the finish-rolled rebar in advance, and its material is brittle low-alloy steel, which is prone to delayed fracture. Therefore, it is necessary to test the fracture phenomenon and preventive measures of prestressed rebar.

At present, the impact protection test of prestressed steel bars usually adopts the steel bar pull-out test, and the steel bar pull-out is mostly static loading, but in reality, the steel bar will bear the impact load, and there are very few studies on the steel bar pull-out test under the impact load.

Contents of the invention

The present invention provides a prestressed steel bar impact protection test device and test method, which are used to solve the above-mentioned current prestressed steel bar impact protection test usually adopts steel bar pulling test, and the steel bar drawing is mostly static loading, but in actual conditions, the steel bar will bear Impact loads, and very little research on steel bar pull-out tests under impact loads is a technical issue.

In order to solve the above technical problems, the present invention discloses a prestressed steel bar impact protection test device, including: a positioning mechanism, the positioning mechanism is equipped with a fixing mechanism, both the positioning mechanism and the fixing mechanism are connected with the steel bar assembly, and the fixing mechanism is connected with a test mechanism .

Preferably, the steel bar assembly includes concrete, in which steel bars are poured, and threaded ends of the steel bars are threadedly connected with threaded blocks.

Preferably, the fixing mechanism includes a fixed shell, the side end of the fixed shell is in contact with the threaded block, the upper and lower ends of the fixed shell are penetrated with a fixed cavity, the fixed shell is fixedly connected with the force block, and the end of the fixed shell away from the force block penetrates through the set There is a through hole, and the through hole communicates with the fixed cavity.

Preferably, the positioning mechanism includes a base on which concrete is placed, and a number of guiding and positioning plates are evenly spaced on the upper end of the base. The left and right ends of the guiding and positioning plates are provided with guiding cavities, and the guiding cavities are slidably connected to the fixed shell.

Preferably, the positioning mechanism further includes a positioning plate, which is fixedly installed on the left side of the upper end of the base, and the upper end of the positioning plate is provided with a positioning groove, the positioning plate is in contact with the concrete, and the steel bars pass through the positioning groove and the through hole to communicate with the outside world.

Preferably, a damper is fixedly installed on the right side of the upper end of the base, a buffer block is provided at the end of the steel bar near the damper, the buffer block is set correspondingly to the damper, a strain gauge 1 is connected to the steel bar and the force block, and the steel bar and The strain gauges on the force block are connected in series.

Preferably, a quick-release mechanism is fixed in the through hole, and the quick-release mechanism includes a fixed sleeve 1, and the fixed sleeve 1 is rotatably arranged in the through hole. A number of clamping components are arranged evenly in the direction, and the clamping components are used to clamp the steel bar. The fixed sleeve 1 is connected to the fixed sleeve 2 in rotation. The left and right ends of the fixed sleeve 2 are provided with the installation hole 2, and the installation hole 2 communicates with the installation hole 1. , Mounting hole 1 cooperates with the steel bar.

Preferably, the fixed sleeve one is connected with a driving assembly, and the driving assembly is connected with a retaining assembly, and the retaining assembly is used to limit the extrusion assembly. The extrusion assembly includes two rotating rods, and the two rotating rods are rotatably arranged in the movable groove , and the rotating rod is in contact with the airbag in the movable groove, the movable groove is symmetrically arranged on the upper and lower sides of the end of the fixed sleeve two away from the fixed sleeve one, the airbag is connected with the air rod through the communication pipeline, and the air rod is fixedly connected with the extrusion plate, The extruding plate is slidably arranged in the first sliding groove, and the first sliding groove is symmetrically arranged on the upper and lower sides of the mounting hole two, and the extruding plate extrudes and fixes the reinforcing bar.

Preferably, it also includes a multi-directional test mechanism, the multi-directional test mechanism includes a base, the upper end of the base is fixedly provided with a connection groove and a test groove, the connection groove is fixedly connected with concrete, the test groove is slidably connected with the sliding block, and the sliding block is connected with the The hydraulic cylinder is fixedly connected, and the hydraulic cylinder is fixedly installed on the base. The first sliding block is provided with a fixing hole, and the fixing hole is fixedly connected with the steel bar. The block two is fixedly connected with an adjustment rod, the adjustment rod is fixedly connected with the briquetting block, the pressure groove on the briquetting block cooperates with the steel bar, the sliding block two is rotatably connected with a support rod, and the support rod is rotatably connected with the base.

A test method for a prestressed steel bar impact protection test device, comprising the following steps:

Step 1: Apply load to the steel bar first, then pour concrete on the loaded steel bar, and cure to the design strength;

Step 2: Place the cured concrete on the base, and the steel bars pass through the positioning grooves and through holes and threadedly connect with the threaded block;

Step 3: Apply a load to the force block and perform a breaking impact test;

Step 4: Measure the strain gauges on the steel bar and the force block to obtain the deformation value of the steel bar.

Step 5: The impact protection test of prestressed steel bars is reflected by the relationship between the applied load value on the force block and the steel bar deformation value.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of the quick release mechanism of the present invention;

Fig. 3 is a side view structural schematic diagram of the fixing sleeve of the present invention;

Figure 4 is a schematic diagram of the enlarged structure of the A region in Figure 2;

Fig. 5 is a schematic structural diagram of the multi-directional testing mechanism of the present invention.

In the figure: 1, concrete; 2, steel bar; 3, fixed shell; 31, fixed cavity; 32, force block; 33, strain gauge 1; 4, positioning mechanism; 41, base; 42, positioning groove; 43, Guide positioning plate; 44, guide cavity; 45, positioning plate; 5, thread block; 51, fixed sleeve one; 52, fixed sleeve two; 53, double-head motor; 54, drive shaft; 55, ring gear; 56, installation Hole one; 57, gear; 58, threaded rod one; 59, threaded sleeve; 510, mounting hole two; 511, rotating rod; 512, airbag; 513, movable groove; 514, connecting pipeline; 515, sealing plate; , gas rod; 517, sealing chamber two; 518, extrusion plate; 519, sliding groove one; 520, telescopic rod; 521, clamping block one; 522, clamping block two; 523, fixed sleeve; One; 525, threaded rod two; 526, limit block; 527, sealing sleeve; 528, pipeline; 529, operation panel; 6, damper; 7, base; 71, connection groove; 72, test groove; Hydraulic cylinder; 74, sliding block one; 75, pressure groove; 76, sliding groove two; 77, briquetting block; 78, fixing hole; 79, sliding block two; 710, adjusting rod; 711, support rod.

detailed description

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and do not refer to the meaning of order or sequence, nor are they used to limit the present invention, but are only for the purpose of distinguishing the following The components or operations described by the same technical terms are only used, but should not be understood as indicating or implying their relative importance or implying the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions and technical features of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as the technical solution. Combinations do not exist and are not within the scope of protection claimed by the present invention.

Example 1

The embodiment of the present invention provides a prestressed reinforcement impact protection test device, as shown in Fig. The mechanism is connected with a test mechanism;

The steel bar assembly includes concrete 1, in which steel bar 2 is poured, and the threaded end of steel bar 2 is threadedly connected with threaded block 5;

The fixing mechanism includes a fixed shell 3, the side end of the fixed shell 3 is in contact with the threaded block 5, the upper and lower ends of the fixed shell 3 are provided with a fixed cavity 31, the fixed shell 3 is fixedly connected with the force block 32, and the fixed shell 3 is far away from the force One end of the block 32 is provided with a through hole, and the through hole communicates with the fixed cavity 31;

Positioning mechanism 4 comprises base 41, and concrete 1 is placed on base 41, and the upper end of base 41 is evenly arranged with some guiding positioning plates 43, and the left and right ends of guiding positioning plates 43 are penetrated with guiding cavity 44, and guiding cavity 44 Slidingly connected with the fixed shell 3;

The positioning mechanism 4 also includes a positioning plate 45, the positioning plate 45 is fixedly installed on the left side of the upper end of the base 41, the upper end of the positioning plate 45 is provided with a positioning groove 42, the positioning plate 45 is in contact with the concrete 1, and the reinforcing bar 2 passes through the positioning groove 42 in turn , The through hole communicates with the outside world;

The right side of the upper end of the base 41 is fixedly equipped with a damper 6, the end of the steel bar 2 near the damper 6 is provided with a buffer block, the buffer block and the damper 6 are correspondingly arranged, and the steel bar 2 and the force block 32 are all connected with a strain gauge. 33, and the steel bar 2 and the strain gauge-33 on the force block 32 are connected in series;

A test method for a prestressed steel bar impact protection test device, comprising the following steps:

Step 1: firstly apply load to steel bar 2, then pour concrete 1 on the loaded steel bar 2, and maintain to the design strength;

Step 2: place the cured concrete 1 on the base 41, and the steel bar 2 passes through the positioning groove 42 and the through hole to be threadedly connected with the threaded block 5;

Step 3: applying a load to the force block 32, and performing a breaking impact test;

Step 4: Measure the strain gauge-33 on the steel bar 2 and the force block 32 to obtain the deformation value of the steel bar 2;

Step 5: The impact protection test of the prestressed steel bar is reflected by the relationship between the value of the applied load on the force block 32 and the deformation value of the steel bar 2 .

The beneficial effect of above-mentioned technical scheme is:

Apply a load to the force applying block 32 to simulate an impact load. When a load is applied to the force applying block 32, the fixed shell 3 moves under the load of the force applying block 32, and the guide cavity 44 guides the movement of the fixed shell 3. , the setting of the fixed cavity 31 can place concrete 1 of different sizes, and at the same time can play a certain protective effect, avoiding the splashing of the broken steel bar 2, and the fixed shell 3 can pass through the steel bars 2 of different diameters, which is convenient and applicable to different sizes In the following steel bar pull-out test, the buffer block is installed on the steel bar 2, which can increase the contact area between the steel bar 2 and the damper 6, and the threaded block 5 is connected to the steel bar 2, so that when the fixed shell 3 moves under the load of the force block 32 Drive the steel bar 2 to move, drive the steel bar 2 to pull when the fixed shell 3 moves, drive the concrete 1 to move when the steel bar 2 is pulled, and the positioning plate 45 on the base 41 limits the concrete 1, so that the gap between the steel bar 2 and the concrete 1 Relative displacement occurs. When the steel bar 2 between the concrete 1 remains static, the steel bar 2 outside the concrete 1 is deformed under the load of the fixed shell 3. The strain gauge-33 on the steel bar 2 and the force block 32 is used to measure The deformation value of steel bar 2 reflects the impact protection effect of the prestressed reinforcement through the relationship between the applied load value on the force block 32 and the deformation value of steel bar 2, and simulates the impact load by applying the load to the force block 32, which can The load is transmitted to the steel bar 2 through the fixed shell 3, which solves the problem that the current prestressed steel bar impact protection test usually uses a steel bar pull-out test, and the steel bar pull-out is mostly static loading. There are very few technical issues under the study of steel pull-out tests.

Example 2

On the basis of Embodiment 1, as shown in Figure 2-4, a quick-release mechanism is fixed in the through hole, and the quick-release mechanism includes a fixed sleeve 51, which is rotatably arranged in the through hole. The left and right ends of the left and right ends of the mounting hole 56 are provided with mounting holes one 56, and several clamping components are evenly distributed in the circumferential direction of the mounting hole one 56. The clamping components include telescopic rods 520, which are fixedly connected with clamping block one 521, and the clamping blocks One 521 is slidingly connected with the arc groove, the clamping block one 521 is fixedly connected with the clamping block two 522, the clamping block two 522 is clamped and fixed with the steel bar 2, and the clamping assembly is used to clamp the steel bar 2, and the fixed sleeve one 51 is connected with the steel bar 2 The two fixed sleeves 52 are rotationally connected, and one end of the two fixed sleeves 52 near the clamping block one 521 is uniformly arranged with several arc-shaped grooves in the circumferential direction. The first mounting hole 56 is connected, and the first mounting hole 56 cooperates with the reinforcing bar 2;

The fixed sleeve one 51 is connected with a driving assembly, and the driving assembly is connected with a retaining assembly. The retaining assembly is used to limit the extrusion assembly. The retaining assembly includes a fixed sleeve 523. The inner ring of the fixed sleeve 523 is slidingly sleeved on the fixed sleeve. On the second 52, and the upper and lower ends of the fixed sleeve 523 are symmetrically provided with a sealing chamber 524, and a sealing plate 515 is slid in the sealing chamber 524, and the sealing plate 515 is fixedly connected with the sealing sleeve 527, and the sealing sleeve 527 runs through the sealing chamber 524 The side end of the threaded rod two 525 is threadedly connected, the threaded rod two 525 is fixedly connected with the operation panel 529, the left and right sides of the sealed chamber one 524 are symmetrically connected with pipelines 528, and the pipelines 528 communicate with the sealed chamber two 517, and the sealed chamber two 517 is slidingly provided with a limit block 526, and the limit block 526 is in contact with the rotating rod 511. The extrusion assembly includes two rotating rods 511, and the two rotating rods 511 are rotatably arranged in the movable groove 513, and the rotating rod 511 and the movable groove 513 The air bag 512 in the middle is in contact, and the movable groove 513 is symmetrically arranged on the upper and lower sides of the end of the fixed sleeve 52 away from the fixed sleeve 1 51. The air bag 512 is connected with the air rod 516 through the communication pipeline 514, and the air rod 516 is fixedly connected with the extrusion plate 518 , the extruding plate 518 is slidably arranged in the first sliding groove 519, and the first sliding groove 519 is arranged symmetrically on the upper and lower sides of the second installation hole 510, and the extruding plate 518 squeezes and fixes the steel bar;

The drive assembly includes a double-head motor 53, which is fixedly connected to the side end of the fixed chamber 31 through a fixed rod, and the double-head motor 53 is fixedly installed on the fixing sleeve 2 52, and the double-head motor 53 is connected to the gear 57 through the drive shaft 54. Fixedly connected, the gear 57 meshes with the inner cavity of the ring gear 55, the ring gear 55 is fixedly connected with the fixed sleeve one 51, and the inner cavity of the ring gear 55 cooperates with the fixed sleeve two 52, and the double-headed motor 53 is far away from the drive shaft 54. One end is fixedly connected with threaded rod one 58, threaded rod one 58 is threadedly connected with threaded sleeve 59, and threaded sleeve 59 is fixedly connected with fixed sleeve 523.

The beneficial effect of above-mentioned technical scheme is:

By setting the quick release mechanism, it is used to install and fix the steel bar 2, improve the connection stability between the steel bar 2 and the fixed shell 3, avoid the thread wear between the steel bar 2 and the threaded block 5, and affect the connection effect between the two, thus affecting the steel bar 2, when installing the steel bar 2, insert the steel bar 2 into the installation hole 2 510 and the installation hole 1 56, then start the double-head motor 53, drive the drive shaft 54 and the threaded rod 1 58 to rotate, and the drive shaft 54 drives the gear 57 rotates, and gear 57 drives ring gear 55 to rotate, and ring gear 55 drives fixed cover one 51 to rotate, and when fixed cover one 51 rotates, drive clamping piece one 521 to rotate by telescopic rod 520, the rotation of arc groove to clamping piece one 521 Play a guiding role, the clamping block 1 521 drives the clamping block 2 522 to move, thereby changing the diameter of the round hole surrounded by a number of clamping blocks 522, by changing the diameter of the round hole, the clamping block 2 522 can carry out the process on the steel bar 2 Clamping and fixing, when the threaded rod 1 58 rotates, it drives the threaded sleeve 59 to move, and the threaded sleeve 59 drives the fixed sleeve 523 to move, and when the fixed sleeve 523 slides, it drives the rotating rod 511 to rotate. The gas enters the air rod 516 through the communication pipeline 514, and the extension of the air rod 516 drives the extruding plate 518 to move, and the extruding plate 518 clamps and fixes the steel bar 2, and then rotates the operating plate 529, which drives the threaded rod 2 525 Rotate, threaded rod 2 525 drives seal sleeve 527 to move, seal sleeve 527 drives seal plate 515 to slide along seal cavity 1 524, seal plate 515 compresses air in seal cavity 1 524 and enters seal cavity 2 517 through pipeline 528, pushing The limiting block 526 in the sealing chamber 2 517 is in contact with the rotating rod 511. When the clamping block 2 522 clamps and fixes the steel bar 2, the limiting block 526 is just in contact with the rotating rod 511, so as to prevent the rotating rod 511 from rotating and causing squeeze. The pressure plate 518 is separated from the steel bar 2, which affects the clamping and fixing of the steel bar 2 by the extrusion plate 518. Under the joint action of the clamping component and the extrusion component, the connection stability between the steel bar 2 and the fixed shell 3 can be further improved, and the clamping The structure of the holding component is different from that of the extruding component. If one of the components is affected by the outside world and cannot maintain the clamping and fixing effect on the steel bar 2, the other component can continue to maintain the normal clamping and fixing effect, avoiding the use of two identical components. When impacting, the clamping and fixing effect on the steel bar 2 cannot be maintained at the same time, resulting in the failure of the quick release mechanism;

When disassembling the steel bar 2, at first reversely rotate the operating plate 529, so that the limit block 526 is no longer in limit contact with the rotating rod 511, and reversely rotate the rotating rod 511. At this time, the extrusion plate 518 can move freely, and then control the double head The motor 53 reversely rotates, and the double-headed motor 53 drives the fixed sleeve 523 and the clamping block 2 522 to return to the original position, and then pulls out the reinforcing bar 2 to complete the dismounting of the reinforcing bar 2.

Example 3

On the basis of embodiment 1, as shown in Figure 5, it also includes a multi-directional test mechanism, the multi-directional test mechanism includes a base 7, the upper end of the base 7 is fixedly provided with a connection groove 71 and a test groove 72, and the connection groove 71 is fixedly connected Concrete 1 is provided, the test tank 72 is slidingly connected with the sliding block one 74, the sliding block one 74 is fixedly connected with the hydraulic cylinder 73, the hydraulic cylinder 73 is fixedly installed on the base 7, the sliding block one 74 is provided with a fixing hole 78, and the fixing hole 78 Connected with the steel bar 2, the sliding block 1 74 is provided with a sliding groove 2 76, the sliding groove 2 76 is slidingly connected with the sliding block 2 79, the sliding block 2 79 is fixedly connected with an adjusting rod 710, and the adjusting rod 710 is fixedly connected with the pressing block 77 , the pressure groove 75 on the briquetting block 77 cooperates with the steel bar 2, the sliding block 2 79 is rotatably connected with a support rod 711, and the support rod 711 is rotatably connected with the base 7.

The beneficial effect of above-mentioned technical scheme is:

According to the requirements for the use of the steel bar 2, select a multi-directional testing mechanism for testing. If the steel bar 2 is used in a high-demand environment, use a multi-directional testing mechanism for testing. Connect the steel bar 2 to the sliding block one 74. The above-mentioned quick release mechanism is set in 74, and it can also be connected with the sliding block 1 74 by threaded connection, and the connecting groove 71 fixes the position of the concrete 1. After the installation of the concrete 1 and the steel bar 2 is completed, adjust the length of the hydraulic cylinder 73, Make the pressure groove 75 fit the steel bar 2, start the hydraulic cylinder 73, the hydraulic cylinder 73 drives the sliding block one 74 to move, the sliding groove two 76 plays a guiding role for the movement of the sliding block one 74, and the sliding block one 74 moves to the steel bar 2 Pulling is carried out in the axial direction, and at the same time, the pressure block 77 is used to press the steel bar 2 in the normal direction. By applying loads to the axial and normal directions of the steel bar 2, the strain gauge 2 is set on the steel bar 2, and the force is installed on the hydraulic cylinder 73. Sensor one detects the force exerted by the pressure block 77 on the hydraulic cylinder 73 on the steel bar 2 through the force sensor one, and the strain gauge two detects the strain value of the steel bar 2. According to the force sensor one detection value, the strain gauge two detection value and the hydraulic cylinder two 73 Applied force, the impact protection test is carried out on steel bar 2.

Example 4

On the basis of embodiment 1, also include:

Force sensor 2: The force sensor 2 is arranged on the end of the threaded block 5 close to the fixed shell 3, and is used to detect the extrusion force between the threaded block 5 and the fixed shell 3;

Alarm: the alarm is set on the fixed shell 3;

Controller: the controller is electrically connected to the second force sensor and the alarm;

The controller controls the work of the alarm based on the detected value of the force sensor two, including the following methods:

The controller calculates the connection stability coefficient between the threaded block 5 and the steel bar 2 according to the extrusion force between the threaded block 5 and the fixed shell 3 detected by the force sensor two and the formula (1), and the controller compares the calculated threaded block 5 with The connection stability factor and the preset stability factor of the steel bar 2, if the calculated connection stability factor between the threaded block 5 and the steel bar 2 is less than the preset stability factor, the controller controls the alarm to alarm;

Among them, K is the connection stability coefficient between the threaded block 5 and the steel bar 2, E is the elastic coefficient of the threaded block 5, L is the pitch diameter of the thread in the threaded block 5, F is the detection value of the force sensor 2, and C is the The small diameter of the thread, m is the number of thread turns in the thread block 5, and S is the thickness of the thread teeth in the thread block 5;

The beneficial effect of above-mentioned technical scheme is:

The force sensor 2 is arranged on one end of the threaded block 5 close to the fixed shell 3 to detect the extrusion force between the threaded block 5 and the fixed shell 3; The extrusion force between the screw block 5 and the steel bar 2 is calculated by formula (1), and the controller compares the calculated connection stability factor between the thread block 5 and the steel bar 2 with the preset stability factor. If the calculated screw thread The connection stability coefficient between block 5 and steel bar 2 is less than the preset stability coefficient, and the controller controls the alarm to alarm to remind the user to replace threaded block 5 in time to avoid relative displacement between threaded block 5 and steel bar 2 and affect the impact protection of steel bar 2 test.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. a prestressed reinforcement impact protection test device is characterized in that, comprising: positioning mechanism (4), positioning mechanism (4) is equipped with fixing mechanism, and positioning mechanism (4) and fixing mechanism are all connected with reinforcing bar assembly, and fixing The mechanism is connected with a test mechanism. 2. a kind of prestressed reinforcement impact protection test device according to claim 1, is characterized in that, reinforcing bar assembly comprises concrete (1), is poured with reinforcing bar (2) in concrete (1), the threaded end of reinforcing bar (2) The threaded connection has a threaded block (5). 3. A kind of prestressed steel bar impact protection test device according to claim 2, is characterized in that, fixed mechanism comprises fixed casing (3), and the side end of fixed casing (3) contacts with screw block (5), and fixed casing The upper and lower ends of (3) are provided with a fixed cavity (31), the fixed shell (3) is fixedly connected with the force block (32), and the end of the fixed shell (3) away from the force block (32) is provided with a through hole , and the through hole communicates with the fixed cavity (31). 4. a kind of prestressed reinforcement impact protection test device according to claim 3 is characterized in that, positioning mechanism (4) comprises base (41), is placed with concrete (1) on the base (41), base The upper end of (41) is uniformly arranged with some guide positioning plates (43), and the left and right ends of the guide positioning plate (43) run through and are provided with guide cavity (44), and guide cavity (44) is slidably connected with fixed shell (3). 5. a kind of prestressed steel bar impact protection test device according to claim 4 is characterized in that, positioning mechanism (4) also comprises positioning plate (45), and positioning plate (45) is fixedly installed on the base (41) On the left side of the upper end, the upper end of the positioning plate (45) is provided with a positioning groove (42), the positioning plate (45) contacts with the concrete (1), and the reinforcing bar (2) passes through the positioning groove (42) and the through hole successively to communicate with the outside world. 6. A kind of prestressed reinforcement impact protection test device according to claim 4, is characterized in that, the upper end right side of pedestal (41) is fixedly equipped with damper (6), and reinforcing bar (2) is close to damper (6) ) is provided with a buffer block, the buffer block and the damper (6) are set correspondingly, the steel bar (2) and the force block (32) are connected with a strain gauge one (33), and the steel bar (2) and the force block Strain gauge one (33) on (32) is connected in series. 7. A kind of prestressed reinforcement impact protection test device according to claim 5, is characterized in that, in the through hole, is fixedly provided with quick release mechanism, and quick release mechanism comprises fixed cover one (51), fixed cover one (51) The rotation is arranged in the through hole, and the left and right ends of the fixed sleeve one (51) are provided with the installation hole one (56). In the installation hole one (56), a number of clamping components are evenly arranged in the circumferential direction, and the clamping components are used for clamping Holding the steel bar (2), the fixed sleeve one (51) is rotationally connected with the fixed sleeve two (52). Hole one (56) is connected, and mounting hole one (56) cooperates with reinforcing bar (2). 8. A kind of prestressed steel impact protection test device according to claim 7, characterized in that, fixed sleeve one (51) is connected with a driving assembly, and the driving assembly is connected with a retaining assembly, and the retaining assembly is used for extruding The assembly is limited, and the extruding assembly includes two rotating rods (511), and the two rotating rods (511) are rotated and arranged in the movable groove (513), and the rotating rod (511) and the air bag in the movable groove (513) ( 512) contact, the movable groove (513) is symmetrically arranged on the upper and lower sides of the end of the fixed sleeve two (52) away from the fixed sleeve one (51), and the air bag (512) is connected with the air rod (516) through the communication pipeline (514), The gas rod (516) is fixedly connected with the extruding plate (518), the extruding plate (518) is slidably arranged in the sliding groove one (519), and the sliding groove one (519) is symmetrically arranged on the upper and lower sides of the mounting hole two (510). side, the extruded plate (518) extrudes and fixes the reinforcing bar. 9. A kind of prestressed reinforcement impact protection test device according to claim 2, is characterized in that, also comprises multidirectional test mechanism, and multidirectional test mechanism comprises base (7), and the upper end of base (7) is fixedly provided with connecting Groove (71) and test groove (72), concrete (1) is fixedly connected in connecting groove (71), and test groove (72) is connected with sliding block one (74) slidingly, and sliding block one (74) is connected with hydraulic cylinder ( 73) Fixed connection, the hydraulic cylinder (73) is fixedly installed on the base (7), the first sliding block (74) is provided with a fixing hole (78), and the fixing hole (78) is fixedly connected with the steel bar (2), the first sliding block (74) is provided with sliding groove two (76), and sliding groove two (76) is slidingly connected with sliding block two (79), and is fixedly connected with adjusting rod (710) on sliding block two (79), and adjusting rod (710) Fixedly connected with the briquetting block (77), the press groove (75) on the briquetting block (77) cooperates with the steel bar (2), the sliding block two (79) is rotatably connected with the support rod (711), and the support rod (711) is connected to the base (7) Rotate connection. 10. a kind of test method based on a kind of prestressed reinforcement impact protection test device as described in any one of claim 1-9, it is characterized in that: comprise the following steps: Step 1: firstly apply a load to the steel bar (2), then pour concrete (1) on the loaded steel bar (2), and maintain to the design strength; Step 2: Place the cured concrete (1) on the base (41), and the steel bar (2) passes through the positioning groove (42) and the through hole to be threadedly connected with the threaded block (5); Step 3: apply a load to the force block (32), and perform a breaking impact test; Step 4: Measure the strain gauge one (33) on the steel bar (2) and the force block (32) to obtain the deformation value of the steel bar (2); Step 5: The impact protection test of the prestressed steel bar is reflected by the relationship between the value of the applied load on the force block (32) and the deformation value of the steel bar (2).

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