Horizontal concrete compression creep testing device

Abstract

The utility model belongs to the technical field of civil engineering testing, and particularly discloses a horizontal concrete compression creep testing device which comprises a bottom plate, twisted steel, a tensioning component, a supporting component, an anchor cable stress meter, a first bearing plate, a second bearing plate, a concrete test block, a first anchoring nut, a second anchoring nut and a dial indicator. The threaded reinforcing steel bar penetrates through the concrete test block, the concrete test block is pressed through cooperation of the tensioning component, the first bearing plate, the second bearing plate and the anchoring nut to simulate stress of the concrete test block, deformation of the concrete test block is reflected through the dial indicator, and therefore creep of concrete is monitored, the adaptability of the device is improved, and the test efficiency is improved. Therefore, the device can be suitable for concrete test blocks with different shapes and sizes, the structure of the device is simpler, and the monitoring cost is reduced while the operation and maintenance convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering testing, in particular to a horizontal concrete compression creep testing device. Background Art

[0002] In the civil engineering and construction industries, concrete, as one of the primary structural materials, is widely used in the construction of critical infrastructure such as bridges, buildings, highways, tunnels, and dams. With the increasing use of concrete under long-term loads, its long-term performance, particularly its creep behavior, has become a key factor in assessing its durability and stability. Creep is the progressive deformation of concrete over time due to stress relaxation under a constant load. Concrete creep is a significant factor affecting the long-term stability of its structure, especially in long-span structures or those subjected to long-term loads. The cumulative effect of creep can lead to displacement, cracking, or even failure. Therefore, accurately monitoring and evaluating concrete's creep characteristics is crucial to ensuring the safety and longevity of structures.

[0003] Many existing creep monitoring devices have obvious defects in adaptability. Most devices can only handle standard-sized concrete specimens and lack the ability to adapt to concrete specimens of various sizes, shapes and configurations. In actual engineering, the sizes and shapes of concrete specimens are often different, which makes existing equipment unable to be widely used in different engineering projects, limiting its flexibility and wide applicability. In addition, existing creep detection equipment usually requires the use of various sensors and complex control systems, which not only leads to a large size of the equipment and complex operation, but also the installation and disassembly process is relatively cumbersome, often requiring specialized personnel to install and debug, increasing the difficulty of use and maintenance. Especially in field applications, due to space limitations and inconvenient operation, it is often difficult to monitor efficiently and accurately, which also increases the monitoring cost and limits the popularity and application of these devices. Therefore, the utility model proposes a horizontal concrete compressive creep test device to solve the above problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a horizontal concrete compression creep testing device to solve the problems of poor adaptability, complex operation and high cost of existing creep monitoring equipment.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by this utility model are as follows:

[0006] A horizontal concrete compressive creep test device includes a base plate, threaded steel bars, a tensioning component, a support component, an anchor strain gauge, a first pressure plate, a second pressure plate, a concrete test block, a first anchor nut, a second anchor nut, and a micrometer. The support component is fixedly mounted on the base plate and includes a first support plate perpendicular to the base plate. The tensioning component is disposed on one side of the first support plate, and the concrete test block is disposed on the other side. The first and second pressure plates are respectively attached to the two ends of the concrete test block. The two sides of the anchor strain gauge abut the first support plate and the first pressure plate, respectively. One end of the threaded steel bar is connected to the tensioning component, and the other end of the threaded steel bar passes through the first support plate, the anchor stress gauge, the first pressure plate, the concrete test block and the second pressure plate in sequence, and abuts against the measuring needle of the micrometer; the first anchor nut and the second anchor nut are respectively threadedly connected to the two ends of the threaded steel bar, and the first anchor nut abuts the second pressure plate, and the second anchor nut can be screwed until it abuts the first support plate.

[0007] Preferably, the support component includes a support frame. The support frame includes the first support plate, the first connecting plate, the second support plate and the second connecting plate enclosed in sequence. The first support plate and the second support plate are both perpendicular to the base plate, and the first connecting plate and the second connecting plate are both parallel to the base plate. A first bolt hole is provided through the second connecting plate, and a first bolt passes through the first bolt hole and is threadedly connected to the base plate. The tensioning component is located on the side of the second support plate facing away from the first support plate. The first support plate and the second support plate are both provided with first through holes facing each other, and the threaded steel bar is passed through the first through hole. The second anchor nut is located between the first support plate and the second support plate.

[0008] Preferably, the tensioning member comprises a through-type jack, the through-type jack being connected to one end of the threaded steel bar for applying tension to the threaded steel bar. The through-type jack is fixedly connected to the second support plate.

[0009] Preferably, the concrete test block is provided with a second through hole. The first and second pressure-bearing plates are both provided with a third through hole. The threaded steel bar is passed through the second and third through holes. The first, second, and third through holes are all directly opposite each other.

[0010] Preferably, the areas of the first and second pressure-bearing plates are both larger than the area of ​​the pressure-bearing surface of the concrete test block. The first and second pressure-bearing plates each comprise a steel plate and a first rubber plate disposed on one side of the steel plate, the first rubber plate being configured to abut against the pressure-bearing surface of the concrete test block.

[0011] Preferably, the device further comprises a first pad and a plurality of second pads fixedly mounted on the base plate. The first pad is used to mount the anchor strain gauge. The second pad is used to support the concrete test block.

[0012] Preferably, the bottom of the first cushion block is provided with second bolt holes on both sides thereof, and the second bolt passes through the second bolt holes and is threadedly connected to the base plate. The top of the first cushion block is provided with a first notch, and the anchor cable stress gauge is installed in the first notch.

[0013] Preferably, the bottom of the second spacer is provided with third bolt holes on both sides, through which third bolts pass and are threadedly connected to the base plate. The top of the second spacer is provided with a second notch, in which the concrete test block is located. The support surface of the second notch is provided with a second rubber sheet.

[0014] Preferably, the device further comprises a mounting frame, the mounting frame being provided at an end of the threaded steel bar away from the tensioning member for mounting the dial indicator. The mounting frame is provided with a plurality of mounting positions in a direction perpendicular to the base plate for adjusting the mounting height of the dial indicator.

[0015] Preferably, the mounting bracket includes a column perpendicular to the base plate. A fourth bolt hole is provided at each end of the bottom of the column, through which a fourth bolt passes and is threadedly connected to the base plate. The column is provided with a plurality of mounting holes evenly spaced along its height, and the dial indicator can be secured to the column via the mounting holes and locking screws.

[0016] In the technical solution of the present invention, the threaded steel bar passes through the first support plate, the anchor stress gauge, the first pressure plate, the concrete test block and the second pressure plate in sequence. One end of the threaded steel bar is connected to the tensioning component, and the other end is threadedly connected to the first anchor nut. When the tensioning component applies tension to the threaded steel bar, the first anchor nut pushes the second pressure plate to apply pressure to the concrete test block. At this time, the two sides of the anchor stress gauge respectively abut the first support plate and the first pressure plate. The anchor stress gauge can monitor the changes in the prestress of the threaded steel bar, thereby ensuring that the concrete test block withstands the preset pressure. When the preset prestress value is reached, it is locked by the second anchor nut to ensure that the concrete test block withstands stable pressure. The micrometer is arranged at the end of the threaded steel bar away from the tensioning component. The measuring needle of the micrometer abuts the end of the threaded steel bar and is perpendicular to the pressure surface of the concrete test block. The micrometer can reflect the deformation of the concrete test block during the compression process, thereby monitoring the creep of the concrete test block.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0018] 1. The horizontal concrete compressive creep test device of the present invention adopts a horizontal design. Compared with the vertical design of the traditional creep test device, the overall structure is simpler and easier to install and carry.

[0019] 2. The horizontal concrete compressive creep test device of the present invention uses threaded steel bars to pass through the concrete test block, and applies pressure to the concrete test block through the cooperation of the tensioning component, the first pressure plate, the second pressure plate and the anchor nut to simulate the concrete stress. The distance between the first pressure plate and the second pressure plate can be adjusted according to the shape and size of the concrete test block, and has good adaptability.

[0020] 3. The tensioning components, threaded steel bars, first pressure plate, second pressure plate, anchor nuts and micrometer of the horizontal concrete compressive creep test device of the utility model are all common devices. No complicated sensors and control systems are used, so the operation and maintenance are relatively simple, and the monitoring cost is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the horizontal concrete compressive creep testing device of the present invention at a first perspective.

[0022] Figure 2 This is a structural schematic diagram of the horizontal concrete compressive creep testing device of the present invention at a second viewing angle.

[0023] Figure 3 This is a schematic assembly diagram of the horizontal concrete compressive creep testing device of the present invention (concrete test blocks and threaded steel bars are not shown).

[0024] Figure 4 It is a structural schematic diagram of the installation frame of the utility model.

[0025] Figure 5 This is a structural schematic diagram of the concrete test block of the present utility model.

[0026] Figure 6 This is a structural schematic diagram of the first pressure-bearing plate of the present utility model.

[0027] Figure 7 It is a structural schematic diagram of the mounting frame of the present utility model.

[0028] Figure 8 This is a schematic structural diagram of the first cushion block and the second cushion block of the present invention.

[0029] Figure markings: 1: base plate; 2: first pad; 201-second bolt hole; 202: first notch; 3: second pad; 301: third bolt hole; 302: second notch; 4: threaded steel bar; 5: tensioning component; 6: supporting component; 601: first through hole; 602: first bolt hole; 7: second anchor nut; 8: anchor strain gauge; 9: first pressure plate; 10: second pressure plate; 11: concrete test block; 1101: second through hole; 12: column; 1201: fourth bolt hole; 1202: mounting hole; 13: micrometer; 14: first bolt; 15: third bolt; 16: first anchor nut; 17: fourth bolt; 18: second rubber plate; 19: third through hole; 20: locking screw. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is illustrated below with examples, and the scope of protection requested by the present invention includes but is not limited to the following embodiments.

[0031] A horizontal concrete compressive creep test device includes a base plate 1, a threaded steel bar 4, a tensioning component 5, a support component 6, an anchor strain gauge 8, a first pressure plate 9, a second pressure plate 10, a concrete test block 11, a first anchor nut 16, a second anchor nut 7, and a micrometer 13. The support component 6 is fixedly mounted on the base plate 1 and includes a first support plate perpendicular to the base plate 1. The tensioning component 5 is provided on one side of the first support plate, and the concrete test block 11 is provided on the other side. The first pressure plate 9 and the second pressure plate 10 are respectively attached to the two ends of the concrete test block 11. The two sides of the anchor strain gauge 8 are respectively abutted against the first support plate and the first pressure plate 9. One end of the threaded steel bar 4 is connected to the tensioning component 5, and the other end of the threaded steel bar 4 passes through the first support plate, the anchor strain gauge 8, the first pressure plate 9, the concrete test block 11, and the second pressure plate 10 in sequence, and abuts against the probe of the micrometer 13. The first anchor nut 16 and the second anchor nut 7 are respectively threadedly connected to the two ends of the threaded steel bar 4, and the first anchor nut 16 abuts the second pressure plate 10, and the second anchor nut 7 can be screwed to abut the first support plate.

[0032] In the technical solution of the present invention, the threaded steel bar 4 passes through the first support plate, the anchor cable stress gauge 8, the first pressure plate 9, the concrete test block 11 and the second pressure plate 10 in sequence. One end of the threaded steel bar 4 is connected to the tensioning component 5, and the other end is threadedly connected to the first anchor nut 16. When the tensioning component 5 applies tension to the threaded steel bar 4, the first anchor nut 16 pushes the second pressure plate 10 to press the concrete test block 11. At this time, the two sides of the anchor cable stress gauge 8 are respectively against the first support plate and the first pressure plate 9, and the anchor cable stress gauge 8 can monitor the threaded steel bar. The prestress of the reinforcement 4 changes, thereby ensuring that the concrete test block 11 is subjected to a preset pressure. When the preset prestress value is reached, it is locked by the second anchor nut 7, thereby ensuring that the concrete test block 11 is subjected to a stable pressure. The micrometer 13 is set at the end of the threaded steel bar 4 away from the tensioning component 5. The probe of the micrometer 13 abuts the end of the threaded steel bar 4 and is perpendicular to the compressive surface of the concrete test block 11. The micrometer 13 can reflect the deformation of the concrete test block 11 during the compression process, thereby monitoring the creep of the concrete test block 11.

[0033] Specifically, the tensioning component 5, the supporting component 6, the anchor stress gauge 8, the first pressure plate 9, the second pressure plate 10 and the micrometer 13 are all located on the upper side of the base plate 1. A plurality of mounting holes are preset on the base plate 1 for fixing each component separately. The first anchor nut 16 abuts against the side of the second pressure plate 10 facing away from the concrete test block 11. The second anchor nut 7 abuts against the side of the first support plate facing away from the anchor stress gauge 8. Furthermore, a mounting seat can be provided at the bottom of the base plate 1 for fixing the base plate 1 to the test bench or the ground, and a shock-absorbing structure (such as a rubber pad) is also provided at the bottom of the base plate 1 to reduce the interference of vibration on the test. In one embodiment, the base plate 1 is a channel steel.

[0034] Anchor cable stress gauge 8 is used to monitor the prestress applied to threaded rebar 4, thereby reflecting the pressure on concrete test block 11. After installation, anchor cable stress gauge 8 should be zero-calibrated using professional calibration equipment to ensure the accuracy of the measured values. Anchor cable stress gauge 8 is a prior art technology, and its specific structure will not be described in detail here.

[0035] The threaded rebar 4 is parallel to the mounting surface of the base plate 1. The stylus of the dial gauge 13 abuts the end of the threaded rebar 4 away from the tensioning member 5 to measure the overall strain of the concrete test block 11. Before testing, the dial gauge 13 must be calibrated to ensure it is set to zero after tightening. To ensure measurement accuracy, the stylus of the dial gauge 13 should be perpendicular to the compression surface of the concrete test block 11.

[0036] Preferably, the support component 6 includes a support frame. The support frame includes a first support plate, a first connecting plate, a second support plate and a second connecting plate enclosed in sequence. The first support plate and the second support plate are both perpendicular to the base plate 1, and the first connecting plate and the second connecting plate are both parallel to the base plate 1. A first bolt hole 602 is provided through the second connecting plate, and the first bolt 14 passes through the first bolt hole 602 and is threadedly connected to the base plate 1. The tensioning component 5 is located on the side of the second support plate away from the first support plate. The first support plate and the second support plate are both provided with first through holes 601 facing each other, and the threaded steel bar 4 is passed through the first through hole 601. The second anchor nut 7 is located between the first support plate and the second support plate.

[0037] The support component 6 is configured in a frame shape, with one end of the threaded steel bar 4 passing through the second support plate and the first support plate in sequence. This not only helps improve the support stability, but also leaves space for the installation of the second anchor nut 7, thereby facilitating the adjustment of the second anchor nut 7. The function of the second anchor nut 7 is to screw the second anchor nut 7 so that it abuts the first support plate after the prestress value of the threaded steel bar 4 reaches the preset value required for the test, thereby ensuring the compressive stability of the concrete test block 11. At the same time, when the prestress of the threaded steel bar 4 fluctuates, fine-tuning and supplementation can also be performed through the second anchor nut 7. In one embodiment, the support frame is hollow square steel.

[0038] Preferably, the tensioning member 5 comprises a through-type jack, which is connected to one end of the threaded steel bar 4 to apply tension to the threaded steel bar 4. The through-type jack is fixedly connected to the second support plate.

[0039] The through-type jack is directly fixed to the second support plate, which is conducive to saving space and making the structure simpler. Wherein, the through-type jack is an existing technology, and its specific structure is not described in detail here.

[0040] A second through-hole 1101 is formed through the concrete test block 11. A third through-hole 19 is formed through both the first and second pressure-bearing plates 9 and 10. The threaded rebar 4 is inserted through the second and third through-holes 1101 and 19. The first, second, and third through-holes 601, 1101, and 19 are all directly opposite each other. This arrangement avoids additional stress concentration during loading, ensuring more accurate test results.

[0041] Preferably, the area of ​​the first and second pressure-bearing plates 9, 10 is larger than the cross-sectional dimensions of the compression surface of the concrete test block 11. Each of the first and second pressure-bearing plates 9, 10 comprises a steel plate and a first rubber plate disposed on one side of the steel plate, with the first rubber plate being used to abut the compression surface of the concrete test block 11. This arrangement evenly distributes the shrinkage force applied to the threaded rebar 4 across the compression cross-section of the concrete test block 11, ensuring that the entire cross-section of the concrete test block 11 is compressed, thereby improving test accuracy. Furthermore, the first rubber plate prevents direct damage to the concrete test block 11 during compression, which could affect creep testing.

[0042] Specifically, the steel plate and the first rubber plate have the same shape and size. In one embodiment, the thickness of the first rubber plate is 1 mm.

[0043] Preferably, the device further comprises a first pad 2 and a plurality of second pads 3 fixedly mounted on the bottom plate 1. The first pad 2 is used to mount the anchor strain gauge 8. The second pad 3 is used to support the concrete test block 11.

[0044] Specifically, the number of second pads 3 should be set according to the length of the concrete test block 11, and the number of second pads 3 should be at least two, and the two second pads 3 are symmetrically arranged at both ends of the concrete test block 11. In one embodiment, the number of second pads 3 is three, and the three second pads 3 are evenly spaced along the length of the concrete test block 11.

[0045] Preferably, second bolt holes 201 are provided on both sides of the bottom of the first cushion block 2, and the second bolts pass through the second bolt holes 201 and are threadedly connected to the bottom plate 1. A first notch 202 is provided on the top of the first cushion block 2, and the anchor cable stress gauge 8 is installed in the first notch 202.

[0046] Specifically, the shape of the first notch 202 should match the shape of the mounting surface of the anchor strain gauge 8 so that the anchor strain gauge 8 can be embedded in the first notch 202 to ensure stable installation. In one embodiment, the mounting surface of the anchor strain gauge 8 and the first notch 202 are both arc-shaped.

[0047] Preferably, third bolt holes 301 are provided on both sides of the bottom of the second spacer 3. The third bolts 15 pass through the third bolt holes 301 and are threadedly connected to the base plate 1. A second notch 302 is provided on the top of the second spacer 3, and the concrete test block 11 is positioned within the second notch 302. The support surface of the second notch 302 is provided with a second rubber sheet 18.

[0048] Specifically, the shape of second notch 302 should ensure stable placement of concrete test block 11. Second rubber sheet 18 is used to prevent concrete test block 11 from being damaged by second pad 3. In one embodiment, concrete test block 11 is rectangular, and second notch 302 is rectangular. Second rubber sheet 18 is 1 mm thick.

[0049] Preferably, the device also includes a mounting bracket, located at the end of the threaded steel bar 4 away from the tensioning member 5, for mounting a dial gauge 13. The mounting bracket is provided with multiple mounting positions perpendicular to the base plate 1 for adjusting the mounting height of the dial gauge 13. This arrangement allows the height of the dial gauge 13 to be adjusted, accommodating creep tests on concrete blocks of varying sizes and increasing the adaptability of the device.

[0050] Preferably, the mounting frame includes a column 12 perpendicular to the base plate 1. A fourth bolt hole 1201 is provided at each end of the bottom of the column 12. The fourth bolt 17 passes through the fourth bolt hole 1201 and is threadedly connected to the base plate 1. A plurality of mounting holes 1202 are provided at equal intervals along the height of the column 12. The dial indicator 13 can be secured to the column 12 via the mounting holes 1202 and the locking screws 20.

[0051] The arrangement of the mounting holes 1202 and the locking screw 20 facilitates the operator to adjust the height of the dial indicator 13. Furthermore, the head of the locking screw 20 is provided with a knob (e.g., a cross knob) to facilitate manual operation. In one embodiment, the number of mounting holes 1202 is three.

[0052] The installation process of this device is as follows:

[0053] S1. Install the base plate: Make sure the base plate is placed on a solid and flat foundation. The ground should be stable and avoid vibration and strong magnetic interference.

[0054] S2. Install the support component, the cushion block, and the mounting frame: fix the support component, the first cushion block, and the second cushion block to corresponding positions of the base plate with bolts in sequence.

[0055] S3. Install the anchor strain gauge: Install the anchor strain gauge on the first pad, ensuring that the installation position of the anchor strain gauge meets the design requirements. The installation of the anchor strain gauge should ensure that its contact surface with other components is flat, free of friction or foreign matter to prevent measurement errors.

[0056] S4. Test Block Placement: Carefully place the cast concrete test block (e.g., 100mm*100mm*515mm) with a pre-reserved hole into the second notch of the second pad. Ensure uniform and stable contact with the first and second bearing plates on both sides to avoid mechanical imbalances caused by improper positioning. Ensure that the holes between the first rubber plate and the steel plate are aligned to avoid additional stress concentration during loading.

[0057] S5. Install threaded steel bars: The threaded steel bars are passed through the supporting component, the second anchor nut, the anchor strain gauge, the first bearing plate, the concrete test block, the second bearing plate in sequence, and are anchored to the first anchor nut.

[0058] S6. Install the dial indicator: Install the dial indicator on the mounting bracket and contact the end of the threaded steel bar. Adjust the dial indicator to be perpendicular to the compression surface of the concrete specimen, so that the needle of the dial indicator contacts the end of the threaded steel bar and the displayed data is zero.

[0059] The specific testing process of this device is as follows:

[0060] 1. Apply prestress

[0061] Use the tensioning component 5 to apply prestress to the threaded steel bar 4. During tensioning, ensure that the direction of force is consistent with the axial direction of the threaded steel bar 4 to avoid the occurrence of deflection force that causes uneven force on the concrete test block 11. The prestress should be gradually increased during the application process, and the numerical changes of the anchor strain gauge 8 should be monitored to ensure that the preset pressure value is reached. When the prestress is applied and the reading of the anchor strain gauge 8 reaches the set value, stop applying force and check whether the pressure is stable. If there is fluctuation, supplement it by adjusting the second anchor nut 7.

[0062] Unless otherwise specified, the loaded stress is usually 40% of the compressive strength of the concrete specimen 11 as the load for the creep test. The amount of load applied each time is precisely controlled by the tensioning component 5, and the load is gradually increased. After loading, the load and deformation must be checked every 24 hours to ensure stability. If the load variation exceeds 2%, it is necessary to reload or adjust the device for correction to ensure load stability. When the load variation exceeds 2%, the force value should be replenished in time. The force is maintained stable by re-applying force to the tensioning component 5 and adjusting the second anchor nut 7.

[0063] 2. Deformation measurement

[0064] At different time points after loading, accurately measure the deformation of the concrete specimen 11 using a dial gauge 13. Record the deformation data at different time points, such as 1d, 3d, 7d, 14d, 28d, 45d, 60d, 90d, 120d, 150d, 180d, 270d, 360d, etc. (where d is the time unit: day), and ensure that all data have sufficient accuracy. Example 1

[0065] like Figure 1-8 As shown, a horizontal concrete compressive creep test device includes a base plate 1, a threaded steel bar 4, a tensioning member 5, a support member 6, an anchor strain gauge 8, a first pressure plate 9, a second pressure plate 10, a concrete test block 11, a first anchor nut 16, a second anchor nut 7, and a micrometer 13. The support member 6 is fixedly mounted on the base plate 1 and includes a first support plate perpendicular to the base plate 1. The tensioning member 5 is provided on one side of the first support plate, and the concrete test block 11 is provided on the other side. The first pressure plate 9 and the second pressure plate 10 are respectively attached to the ends of the concrete test block 11. The two sides of the anchor strain gauge 8 abut the first support plate and the first pressure plate 9, respectively. One end of the threaded steel bar 4 is connected to the tensioning member 5, and the other end of the threaded steel bar 4 passes through the first support plate, the anchor strain gauge 8, the first pressure plate 9, the concrete test block 11, and the second pressure plate 10 in sequence, and abuts the probe of the micrometer 13. The first anchor nut 16 and the second anchor nut 7 are respectively threadedly connected to the two ends of the threaded steel bar 4, and the first anchor nut 16 abuts the second pressure plate 10, and the second anchor nut 7 can be screwed to abut the first support plate. Example 2

[0066] The embodiment 1 is repeated except that the supporting member 6 is a supporting frame and the tensioning member 5 is a through-type jack.

[0067] The support frame includes a first support plate, a first connecting plate, a second support plate, and a second connecting plate, which are enclosed in sequence. The first support plate and the second support plate are both perpendicular to the base plate 1, and the first connecting plate and the second connecting plate are both parallel to the base plate 1. A first bolt hole 602 is provided through the second connecting plate, and the first bolt 14 passes through the first bolt hole 602 and is threadedly connected to the base plate 1. The through-type jack is fixedly connected to the side of the second support plate facing away from the first support plate. The second anchor nut 7 is located between the first support plate and the second support plate. The through-type jack is connected to one end of the threaded steel bar 4, and the through-type jack is fixedly connected to the second support plate. Example 3

[0068] The second embodiment is repeated except that the supporting member 6 comprises a first supporting plate and a second connecting plate perpendicular to each other. The tensioning member 5 comprises an electric cylinder, an anchor and a reaction frame.

[0069] The first support plate is perpendicularly connected to the second connecting plate. The second connecting plate is provided with a first bolt hole 602. The first bolt 14 passes through the first bolt hole 602 and is threadedly connected to the base plate 1. A reaction frame is fixedly mounted on the base plate 1, located on the side of the first support plate away from the concrete test block 11. The fixed end of the electric cylinder is fixedly connected to the reaction frame, while the movable end of the electric cylinder is fixedly connected to one end of the threaded rebar 4 via a nut-type anchor. The direction of extension and contraction of the electric cylinder is parallel to the axis of the threaded rebar 4. In this embodiment, the extension and contraction of the electric cylinder applies prestress to the threaded rebar 4, thereby compressing the concrete test block 11. Example 4

[0070] Example 3 was repeated, except that the first and second support plates were each provided with first through-holes 601 that faced each other. The threaded rebar 4 was inserted through the first through-hole 601, and the concrete test block 11 was provided with second through-holes 1101. The first and second pressure-bearing plates 9 and 10 were each provided with third through-holes 19. The threaded rebar 4 was inserted through the first through-hole 601, the second through-hole 1101, and the third through-hole 19. The first through-hole 601, the second through-hole 1101, and the third through-hole 19 all faced each other. Example 5

[0071] Example 4 was repeated, except that the areas of the first pressure-bearing plate 9 and the second pressure-bearing plate 10 were both larger than the area of ​​the pressure-bearing surface of the concrete test block 11. The first pressure-bearing plate 9 and the second pressure-bearing plate 10 each comprised a steel plate and a first rubber plate disposed on one side of the steel plate, the first rubber plate being configured to abut the pressure-bearing surface of the concrete test block 11. Example 6

[0072] Example 5 is repeated, except that the device further includes a first pad 2 and a plurality of second pads 3 fixedly mounted on the bottom plate 1. The first pad 2 is used to mount the anchor strain gauge 8. The second pad 3 is used to support the concrete test block 11. Example 7

[0073] Repeat Example 6, except that the device further includes a mounting frame, which is provided at the end of the threaded steel bar 4 away from the tensioning member 5 for mounting the dial gauge 13. The mounting frame is provided with multiple mounting positions in a direction perpendicular to the base plate 1 for adjusting the mounting height of the dial gauge 13. Example 8

[0074] Example 7 is repeated, except that the mounting frame includes a column 12 perpendicular to the base plate 1. A fourth bolt hole 1201 is provided at each end of the bottom of the column 12. The fourth bolt 17 passes through the fourth bolt hole 1201 and is threadedly connected to the base plate 1. A plurality of mounting holes 1202 are provided at equal intervals along the height of the column 12. The dial indicator 13 can be secured to the column 12 via the mounting holes 1202 and the locking screws 20.

Claims

1. A horizontal concrete compressive creep testing device, characterized by: The device comprises a base plate (1), a threaded steel bar (4), a tensioning component (5), a supporting component (6), an anchor cable stress gauge (8), a first pressure-bearing plate (9), a second pressure-bearing plate (10), a concrete test block (11), a first anchor nut (16), a second anchor nut (7) and a micrometer (13); the supporting component (6) is fixedly arranged on the base plate (1), and the supporting component (6) comprises a first supporting plate perpendicular to the base plate (1); the tensioning component (5) is arranged on one side of the first supporting plate, and the concrete test block (11) is arranged on the other side; the first pressure-bearing plate (9) and the second pressure-bearing plate (10) are respectively attached to the two ends of the concrete test block (11); the anchor cable stress gauge (8) is fixedly arranged on the base plate (1), and the second pressure-bearing plate (10) is fixedly arranged on the base plate (1). The two sides of the force gauge (8) respectively abut the first support plate and the first pressure plate (9); one end of the threaded steel bar (4) is connected to the tensioning component (5), and the other end of the threaded steel bar (4) passes through the first support plate, the anchor stress gauge (8), the first pressure plate (9), the concrete test block (11) and the second pressure plate (10) in sequence, and abuts against the probe of the micrometer (13); the first anchor nut (16) and the second anchor nut (7) are respectively threadedly connected to the two ends of the threaded steel bar (4), and the first anchor nut (16) abuts the second pressure plate (10), and the second anchor nut (7) can be screwed until it abuts the first support plate.

2. The horizontal concrete compressive creep testing device according to claim 1, characterized in that: The support component (6) includes a support frame; the support frame includes the first support plate, the first connecting plate, the second support plate and the second connecting plate which are enclosed in sequence; the first support plate and the second support plate are both perpendicular to the base plate (1), and the first connecting plate and the second connecting plate are both parallel to the base plate (1); a first bolt hole (602) is formed through the second connecting plate, and a first bolt (14) passes through the first bolt hole (602) and is threadedly connected to the base plate (1); the tensioning component (5) is located on the side of the second support plate away from the first support plate; the first support plate and the second support plate are both formed with first through holes (601) facing each other, and the threaded steel bar (4) is passed through the first through hole (601); the second anchor nut (7) is located between the first support plate and the second support plate.

3. The horizontal concrete compressive creep testing device according to claim 2, characterized in that: The tensioning component (5) comprises a through-type jack, the through-type jack being connected to one end of the threaded steel bar (4) for applying tension to the threaded steel bar (4); the through-type jack being fixedly connected to the second support plate.

4. The horizontal concrete compressive creep testing device according to claim 2, characterized in that: The concrete test block (11) is provided with a second through hole (1101); the first pressure-bearing plate (9) and the second pressure-bearing plate (10) are both provided with a third through hole (19); the threaded steel bar (4) is passed through the second through hole (1101) and the third through hole (19); the first through hole (601), the second through hole (1101) and the third through hole (19) are all directly opposite to each other.

5. The horizontal concrete compressive creep testing device according to claim 1, characterized in that: The areas of the first pressure-bearing plate (9) and the second pressure-bearing plate (10) are both larger than the area of ​​the pressure-bearing surface of the concrete test block (11); the first pressure-bearing plate (9) and the second pressure-bearing plate (10) each comprise a steel plate and a first rubber plate arranged on one side of the steel plate, the first rubber plate being used to abut against the pressure-bearing surface of the concrete test block (11).

6. The horizontal concrete compressive creep testing device according to claim 1, characterized in that: The device further comprises a first pad (2) and a plurality of second pads (3) fixedly arranged on the base plate (1); the first pad (2) is used for mounting the anchor strain gauge (8); and the second pad (3) is used for supporting the concrete test block (11).

7. The horizontal concrete compressive creep testing device according to claim 6, characterized in that: Second bolt holes (201) are respectively provided on both sides of the bottom of the first cushion block (2), and a second bolt passes through the second bolt hole (201) and is threadedly connected to the base plate (1); a first notch (202) is provided on the top of the first cushion block (2), and the anchor cable stress gauge (8) is installed in the first notch (202).

8. The horizontal concrete compressive creep testing device according to claim 6, characterized in that: Third bolt holes (301) are respectively provided on both sides of the bottom of the second pad (3), and the third bolt (15) passes through the third bolt hole (301) and is threadedly connected to the bottom plate (1); a second notch (302) is provided on the top of the second pad (3), and the concrete test block (11) is located in the second notch (302); and a second rubber plate (18) is provided on the supporting surface of the second notch (302).

9. The horizontal concrete compressive creep testing device according to claim 1, characterized in that: The device further comprises a mounting frame, which is arranged at one end of the threaded steel bar (4) away from the tensioning member (5) for mounting the micrometer (13); the mounting frame is provided with a plurality of mounting positions in a direction perpendicular to the base plate (1) for adjusting the mounting height of the micrometer (13).

10. The horizontal concrete compressive creep testing device according to claim 9, characterized in that: The mounting frame comprises a column (12) perpendicular to the base plate (1); fourth bolt holes (1201) are respectively provided at both ends of the bottom of the column (12); a fourth bolt (17) passes through the fourth bolt hole (1201) and is threadedly connected to the base plate (1); a plurality of mounting holes (1202) are provided on the column (12) at equal intervals along the height direction, and the micrometer (13) can be fixed to the column (12) through the mounting holes (1202) and the locking screws (20).

Images