Concrete tensile detection test device

Abstract

The invention discloses a concrete tensile detection test device, which relates to the technical field of concrete detection, and comprises: a support assembly comprising a base and a support frame fixed on the top of the base; the fixing assembly comprises mounting pieces symmetrically fixed to the top and the bottom of the supporting frame, clamping jaws for fixing the concrete test pile are further symmetrically arranged in the mounting pieces, and a centering piece is further fixed between the mounting pieces; the stretching hydraulic cylinder is fixed to the top of the supporting frame and fixed to the mounting piece on the top of the supporting frame. The problems that an existing experimental device is complex in structure, and it is difficult to guarantee that a test piece coincides with a loading axis during installation are solved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete detection, and in particular to a concrete tensile detection test device. Background Art

[0002] In engineering fields such as construction, roads and bridges, the evaluation of concrete mechanical properties is related to structural safety and durability, among which axial tensile performance is extremely critical. Accurate axial tensile test data is of great significance to material research and development, engineering design and construction. However, there are many problems with the current concrete axial tensile test equipment. When preparing and installing the specimen, strict requirements are placed on the accuracy of the shape and size. The preparation is complex and prone to deviations. It is difficult to ensure that the specimen coincides with the loading axis during installation. Eccentricity can cause distortion of the results, and the end connection method also has defects. In the loading and measurement link, stress concentration can easily cause the failure position to deviate. The loading system has low accuracy and the measuring instrument is inaccurate, which affects the accuracy of the results. In terms of test operation, the device has a complex structure, is difficult to install and debug, occupies a large area, is inconvenient to carry, has a high maintenance cost, has a low degree of automation, and relies on manual labor that is prone to errors. Summary of the invention

[0003] In view of the fact that the above-mentioned existing experimental devices have complex structures and it is difficult to ensure that the test piece coincides with the loading axis during installation, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a concrete tensile testing device, comprising a supporting assembly, including a base and a supporting frame fixed on the top thereof; a fixing assembly, including mounting parts symmetrically fixed on the top and bottom of the supporting frame, wherein the mounting parts are also symmetrically provided with clamps for fixing concrete test piles, and a centering part is also fixed between the mounting parts; a tensile hydraulic cylinder, which is fixed on the top of the supporting frame and fixed to the mounting parts on the top.

[0005] As a preferred solution of the concrete tensile testing device of the present invention, the mounting member includes a sliding rod and a cover shell fixed on the top thereof, and the outer walls of the cover shell on opposite sides are provided with through holes; a sliding plate is horizontally and symmetrically fixedly connected to the opening at the top of the cover shell, and connecting plates are symmetrically fixedly connected to the two ends of the sliding plate; sliding holes are symmetrically opened on the side walls at both ends of the sliding plate, and a threaded hole is opened in the middle of the connecting plate, and a first spring is also fixed to the opposite ends of the connecting plate.

[0006] As a preferred solution of the concrete tensile testing device of the present invention, the clamping claw is slidably arranged between the slide plates, including a sliding seat and a clamping claw; the outer walls on both sides of the sliding seat are symmetrically fixedly connected with sliding plates, the sliding plates slide through the sliding holes, and the ends of the sliding plates are also fixedly connected with docking plates, and the docking plates are fixedly connected to the first spring.

[0007] As a preferred solution of the concrete tensile testing device of the present invention, wherein: a connecting ear is symmetrically fixedly connected to the side wall of the sliding seat adjacent to the sliding plug plate, and the clamping claw is rotated to be connected between the connecting ears; a screw rod is also rotatably inserted on the sliding seat on the side opposite to the connecting ear, and the screw rod is threadedly inserted into the threaded hole, and a rotating handle is also fixedly connected to the end thereof; a clamping inclined surface is provided on the side of the clamping claw away from the connecting ear, and the clamping inclined surface abuts against the outer wall of the concrete test pile.

[0008] As a preferred solution of the concrete tensile testing device of the present invention, the centering member includes symmetrically arranged mounting plates and floating plates connected between the mounting plates, the mounting plates are detachably connected to the middle outer wall of the slide plate, and the outer wall away from the slide plate is symmetrically fixedly connected with a sliding sleeve, and the axis of the sliding sleeve is parallel to the displacement direction line of the concrete test pile.

[0009] As a preferred solution of the concrete tensile testing device of the present invention, wherein: the floating plate is symmetrically fixedly connected with suspended rods at both ends, and the suspended rods are slidably inserted into the sliding sleeve; the two ends of the suspended rod are also fixedly connected with anti-drop caps, and the suspended rod is also sleeved with a second spring, and the two ends of the second spring are respectively abutted against the anti-drop cap and the sliding sleeve.

[0010] As a preferred solution of the concrete tensile testing device of the present invention, wherein: an auxiliary push piece is also slidably inserted in the floating plate, and the auxiliary push piece includes a cross plate and a rebound rod symmetrically fixed in the middle of the plate surface on one side thereof; the rebound rod is slidably inserted into the floating plate, and a rebound cap is fixedly connected to its end, and the rebound rod is also sleeved with a third spring, and the two ends of the third spring are respectively abutted against the rebound cap and the floating plate; wherein the horizontal sections of the cross plates on both sides abut against the horizontal outer walls of the concrete test piles, and the vertical sections of the cross plates abut against the vertical outer walls of the concrete test piles.

[0011] As a preferred solution of the concrete tensile testing device of the present invention, wherein: the support frame includes a top plate and a bottom plate, and a plurality of groups of support rods are fixedly connected between the top plate and the bottom plate; a height adjustment slide is fixedly connected to the bottom plate, and a height adjustment clamp is symmetrically slidably connected in the height adjustment slide; the sliding rod on the bottom mounting part slides through the middle of the height adjustment slide and extends from the bottom plate, and a pressure cap is also fixedly connected to the end of the sliding rod at the bottom.

[0012] As a preferred solution of the concrete tensile testing device of the present invention, wherein: the inner walls on both sides of the height adjustment slide are symmetrically provided with card insertion holes, the outer wall of the height adjustment card is symmetrically fixed with a card insertion plate, and the card insertion plate is slidably engaged in the card insertion hole; the end of the card insertion plate is fixedly connected to a first rotating shaft, a connecting rod is rotatably sleeved on the outside of the first rotating shaft, and the other end of the connecting rod is rotatably connected to a second rotating shaft symmetrically connected to the outer wall of the cover shell.

[0013] As a preferred solution of the concrete tensile detection test device of the present invention, wherein: the bottom of the height adjustment clamp is also fixedly connected to a limiting tooth plate, the limiting tooth plate passes through the bottom plate and extends out of the bottom plate; the outer sliding sleeve of the bottom sliding rod is slidably sleeved with a locking plate and a fourth spring, the two ends of the fourth spring are respectively abutted against the pressure cap and the locking plate, the top of the locking plate is provided with a groove, the bottom of the groove is provided with a plurality of groups of tooth grooves, the limiting tooth plate can be matched and placed in the groove, and the tooth block on the limiting tooth plate is movably engaged with the tooth groove; the stretching hydraulic cylinder is fixedly connected to the top of the top plate, and the output end of the stretching hydraulic cylinder is fixedly connected to the sliding rod on the mounting member at the top.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The clamping parts at both ends of the concrete test pile are clamped and fixed by the cooperation of the clamping jaws and the mounting parts. During the installation process, the centering piece assists with the thrust to maintain the concrete test pile in the center of the device to avoid eccentricity. In addition, the position of the clamping jaws can be flexibly adjusted to adapt to concrete test piles of different sizes. When the concrete test pile is broken under stress, the centering piece can continue to maintain the integrity of the concrete test pile, which is convenient for observing and recording the situation of the broken part. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 It is a schematic diagram of the overall structure of the concrete tensile testing device of the present invention.

[0016] Figure 2 It is a schematic diagram of the installation of concrete test piles of the concrete tensile testing device of the present invention.

[0017] Figure 3 The figure is a schematic diagram of the structure of the mounting parts of the concrete tensile testing device of the present invention.

[0018] Figure 4 It is a schematic diagram of the clamping jaw structure of the concrete tensile testing device of the present invention.

[0019] Figure 5 It is a schematic diagram of the structure of the centering piece of the concrete tensile testing device of the present invention.

[0020] Figure 6 It is a schematic diagram of the support assembly structure of the concrete tensile testing device of the present invention.

[0021] Figure 7 It is a schematic diagram of the height adjustment clamp structure of the concrete tensile testing device of the present invention.

[0022] Figure 8 This is a schematic diagram of the installation of the limit tooth plate of the concrete tensile testing device of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Example 1 Reference Figure 1 to Figure 8 , which is the first embodiment of the present invention, provides a concrete tensile testing device, which includes a support assembly 100, including a base 101 and a support frame 102 fixed on the top thereof.

[0028] The base 101 is the supporting base of the whole device, and the supporting frame 102 is the installation place of the remaining structures.

[0029] The fixing assembly 200 includes mounting members 201 symmetrically fixed to the top and bottom of the support frame 102 , and clamps 202 for fixing the concrete test pile A are symmetrically arranged inside the mounting members 201 , and a centering member 203 is fixed between the mounting members 201 .

[0030] Furthermore, both ends of the concrete test pile A are conical clamping parts, which can be placed in the mounting member 201 , and cooperate with the clamping jaws 202 to clamp the conical inclined surface, so as to fix the conical clamping part inside the mounting member 201 .

[0031] Furthermore, the centering member 203 can push the concrete test pile A from both sides, and during the installation of the concrete test pile A, it can assist the concrete test pile A in being positioned in the middle of the installation member 201 to prevent the installation from deviating.

[0032] The tension hydraulic cylinder 300 is fixed to the top of the support frame 102 and is fixed to the top mounting member 201 . The tension hydraulic cylinder 300 provides tension power for the concrete test pile A.

[0033] During use, to cope with concrete test piles A of different lengths, to prevent them from being too long or too short to be installed, the bottom mounting piece 201 can be adjusted in height. When the concrete test pile A is longer, the bottom mounting piece 201 can be adjusted downward, and when the concrete test pile A is shorter, the bottom mounting piece 201 can be adjusted upward, so as to maintain the concrete test pile A in the center of the support frame 102 for easy observation.

[0034] Example 2 Reference Figure 1 to Figure 8 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the mounting member 201 includes a slide rod 201a and a cover 201b fixed on the top thereof, and the outer walls of the cover 201b on opposite sides are provided with through holes 201b-1.

[0035] The cover 201b is an isosceles trapezoidal structure with an accommodating space provided inside. The through holes 201b-1 are provided on the two waists of the isosceles trapezoid. The conical clamping part of the concrete test pile A can pass through the through holes 201b-1 to ensure that the conical clamping part fits tightly with the cover 201b.

[0036] A slide plate 201c is horizontally and symmetrically fixedly connected to the top opening of the cover shell 201b, and connecting plates 201d are symmetrically fixedly connected to both ends of the slide plate 201c.

[0037] Sliding holes 201c-1 are symmetrically provided on the side walls at both ends of the slide plate 201c, a threaded hole 201d-1 is provided in the middle of the connecting plate 201d, and first springs T1 are fixed to opposite ends of the connecting plate 201d.

[0038] The clamping jaw 202 is slidably disposed between the slide plates 201c, and includes a sliding seat 202a and a clamping jaw 202b.

[0039] The sliding plates 202a-1 are symmetrically fixedly connected to the opposite outer walls of the sliding seat 202a. The sliding plates 202a-1 slide through the sliding holes 201c-1, and the ends of the sliding plates 202a-2 are fixedly connected to the docking plates 202a-2. The docking plates 202a-2 are fixedly connected to the first springs T1.

[0040] During use, the sliding seats 202a installed on both sides can be synchronously retracted and clamped toward the center along the sliding seats 202a, or opened to both sides at the same time.

[0041] A side wall of the sliding seat 202a adjacent to the sliding plate 202a-1 is symmetrically fixedly connected with connecting ears 202a-3, and the claws 202b are rotated and connected between the connecting ears 202a-3.

[0042] A screw rod 202a-4 is rotatably inserted on the sliding seat 202a on the side opposite to the connecting ear 202a-3. The screw rod 202a-4 is threadedly inserted into the threaded hole 201d-1, and a rotating handle 202a-3a is fixedly connected to its end. By rotating the rotating handle 202a-3a, the relative distance between the sliding seats 202a can be adjusted to adapt to concrete test piles A of different sizes.

[0043] A clamping slope X is formed on the side of the clamping claw 202 b away from the connecting ear 202 a - 3 , and the clamping slope X abuts against the outer wall of the concrete test pile A.

[0044] During use, in the mounting member 201 located at the top, the cover 201b opens downward, and the claw 202b can rotate at a certain angle in the sliding seat 202a. When the concrete test pile A is not clamped, the claw 202b naturally hangs down. At this time, the clamping slope X is parallel to the end face of the slide plate 201c. When the concrete test pile A is installed, it can be inserted into the cover 201b from bottom to top. At this time, the claw 202b can be moved to align the clamping slope X with the conical slope of the clamping part of the concrete test pile A, and then the handle 202a-3a is rotated, and the clamping slope X gradually fits tightly with the conical slope of the clamping part.

[0045] In the mounting member 201 located at the bottom, the cover 201b opens upward, and the clamping portion at the bottom of the concrete test pile A is inserted into the cover 201b from top to bottom, and then the clamping claw 202b is controlled to clamp it.

[0046] It should be noted that the concrete test pile A can be first fixed to the top mounting member 201 or first fixed to the bottom mounting member 201, regardless of the order.

[0047] The remaining structures are the same as those of Example 1.

[0048] Example 3 Reference Figure 1 to Figure 8 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the centering member 203 includes symmetrically arranged mounting plates 203a and floating plates 203b connected between the mounting plates 203a, the mounting plates 203a are detachably connected to the middle outer wall of the slide plate 201c, and the outer wall away from the slide plate 201c is symmetrically fixedly connected with a sliding sleeve 203a-1, and the axis of the sliding sleeve 203a-1 is parallel to the displacement direction line of the concrete test pile A.

[0049] The floating plate 203b is also symmetrically and fixedly connected with suspension rods 203b-1 at both ends thereof, and the suspension rods 203b-1 are slidably inserted into the sliding sleeves 203a-1.

[0050] Anti-drop caps 203b-1a are fixedly connected to both ends of the suspension rod 203b-1. A second spring T2 is sleeved on the suspension rod 203b-1. Both ends of the second spring T2 are respectively in contact with the anti-drop cap 203b-1a and the sliding sleeve 203a-1.

[0051] During use, under the elastic force of the second spring T2, the floating plate 203b can maintain the same distance from the mounting plates 203a on both sides, which means that the floating plate 203b is always located at the center of the fractured portion of the concrete test pile A.

[0052] An auxiliary push member 203c is also slidably inserted in the floating plate 203b. The auxiliary push member 203c includes a cross plate 203c-1 and a rebound rod 203c-2 symmetrically fixed to the middle of one side of the plate surface.

[0053] The rebound rod 203c-2 is slidably inserted into the floating plate 203b, and its end is fixedly connected with the rebound cap 203c-3. The rebound rod 203c-2 is also sleeved with a third spring T3, and the two ends of the third spring T3 are respectively in contact with the rebound cap 203c-3 and the floating plate 203b.

[0054] The horizontal sections 203c-1a of the cross plates 203c-1 on both sides abut against the outer wall of the concrete test pile A in the horizontal direction, and the vertical sections 203c-1b of the cross plates 203c-1 abut against the outer wall of the concrete test pile A in the vertical direction.

[0055] During the installation of the concrete test pile A, the third springs T3 on both sides can give equal thrust to the outer wall of the concrete test pile A through the cross plate 203c-1, ensuring that the concrete test pile A is located in the middle of the cover 201b.

[0056] After the tensile test is completed, the cross plate 203c-1 can continue to maintain the integrity of the concrete test pile, making it easier to observe and record the conditions of the fractured parts.

[0057] The support frame 102 includes a top plate 102a and a bottom plate 102b, and a plurality of groups of support rods 102c are fixedly connected between the top plate 102a and the bottom plate 102b.

[0058] A height-adjusting slideway 102b-1 is fixedly connected to the bottom plate 102b, and a height-adjusting clamp 102b-2 is symmetrically slidably connected inside the height-adjusting slideway 102b-1.

[0059] The slide bar 201a on the bottom mounting member 201 slides through the middle of the height-adjusting slide rail 102b-1 and extends out from the bottom plate 102b, and the end of the bottom slide bar 201a is also fixedly connected with a pressure cap 201a-1.

[0060] The inner walls on both sides of the height-adjusting slide 102b-1 are symmetrically provided with card insertion holes 102b-1a, and the outer wall of the height-adjusting card 102b-2 is symmetrically fixed with card insertion boards 102b-2a, which are slidably engaged in the card insertion holes 102b-1a. The engagement between the card insertion boards 102b-2a and the card insertion holes 102b-1a can limit the height-adjusting card 102b-2 from vertically detaching from the height-adjusting slide 102b-1.

[0061] The end of the card insertion board 102b-2a is fixedly connected to a first rotating shaft 102b-2b, a connecting rod 102b-3 is rotatably sleeved outside the first rotating shaft 102b-2b, and the other end of the connecting rod 102b-3 is rotatably connected to a second rotating shaft 201b-2 symmetrically connected to the outer wall of the cover shell 201b.

[0062] During use, the clamping member 102b-2 can be raised by horizontally pushing it, and the height of the lower mounting member 201 can be adjusted up and down by the connecting rod 102b-3.

[0063] A limiting tooth plate 102b-2c is also fixedly connected to the bottom of the height-adjusting clamp 102b-2. The limiting tooth plate 102b-2c passes through the bottom plate 102b and extends out of the bottom plate 102b.

[0064] The bottom slide bar 201a is slidably sleeved with a locking plate 102b-4 and a fourth spring T4. The two ends of the fourth spring T4 are respectively abutted against the pressure cap 201a-1 and the locking plate 102b-4. A groove 102b-4a is provided on the top of the locking plate 102b-4. A plurality of groups of tooth grooves 102b-4b are arranged at the bottom of the groove 102b-4a. The limiting tooth plate 102b-2c can be placed in the groove 102b-4a. The tooth block on the limiting tooth plate 102b-2c is movably engaged with the tooth groove 102b-4b.

[0065] During use, when the height of the lower mounting member 201 needs to be adjusted, the locking plate 102b-4 needs to be pulled down so that the tooth block on the limiting tooth plate 102b-2c is disengaged from the tooth groove 102b-4b, releasing the engaging state. At this time, push the height adjustment member 102b-2, and after the lower mounting member 201 reaches the required height, release the locking plate 102b-4, and the tooth block on the limiting tooth plate 102b-2c is re-engaged with the tooth groove 102b-4b to fix the horizontal position of the height adjustment member 102b-2.

[0066] After the height of the lower mounting member 201 is fixed, the fourth spring T4 gives an upward thrust to the locking plate 102b-4, so that it is always close to the wall of the bottom plate 102b, preventing the tooth block from being separated from the tooth groove 102b-4b.

[0067] The stretching hydraulic cylinder 300 is fixedly connected to the top of the top plate 102 a , and the output end of the stretching hydraulic cylinder 300 is fixedly connected to the sliding rod 201 a on the top mounting member 201 .

[0068] The tension hydraulic cylinder 300 pulls the concrete test pile A through the slide bar 201a on the top mounting part 201. At this time, the height of the lower mounting part 201 is fixed, and the upper mounting part 201 has a tendency to move upward, so when a certain force is reached, the concrete test pile A will break.

[0069] It should be noted that the tensioning hydraulic cylinder 300 is used in conjunction with a force sensor to monitor the output tension of the tensioning hydraulic cylinder 300 in real time. When the tension suddenly changes drastically, it means that the concrete test pile A has broken, and the tensioning hydraulic cylinder 300 will automatically stop working.

[0070] The remaining structure is the same as that of Example 2.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A concrete tensile testing device, characterized in that: include, A support assembly (100) comprises a base (101) and a support frame (102) fixed on the top thereof; The fixing assembly (200) comprises mounting members (201) symmetrically fixed to the top and bottom of the support frame (102), the mounting members (201) also having symmetrically arranged clamping claws (202) for fixing the concrete test pile (A), and a centering member (203) fixed between the mounting members (201); The stretching hydraulic cylinder (300) is fixed to the top of the support frame (102) and is fixed to the mounting member (201) at the top.

2. The concrete tensile testing device according to claim 1 is characterized in that: The mounting member (201) comprises a sliding rod (201a) and a cover shell (201b) fixed on the top thereof, and the cover shell (201b) has through holes (201b-1) formed on two opposite outer walls. A slide plate (201c) is horizontally and symmetrically fixedly connected to the top opening of the cover shell (201b), and connecting plates (201d) are symmetrically fixedly connected to both ends of the slide plate (201c); The side walls at both ends of the slide plate (201c) are symmetrically provided with sliding holes (201c-1), the middle of the connecting plate (201d) is provided with a threaded hole (201d-1), and first springs (T1) are fixed at opposite ends of the connecting plate (201d).

3. The concrete tensile testing device according to claim 2 is characterized in that: The clamping claw (202) is slidably disposed between the slide plates (201c), and comprises a sliding seat (202a) and a clamping claw (202b); The sliding plates (202a-1) are symmetrically and fixedly connected to the outer walls of the sliding seat (202a) on both sides opposite to each other. The sliding plates (202a-1) slide through the sliding holes (201c-1) and are also fixedly connected to the ends of the sliding plates (202a-2). The docking plates (202a-2) are fixedly connected to the first spring (T1).

4. The concrete tensile testing device according to claim 3 is characterized in that: A side wall of the sliding seat (202a) adjacent to the sliding plug plate (202a-1) is symmetrically fixedly connected with connecting ears (202a-3), and the clamping claw (202b) is rotated to be connected between the connecting ears (202a-3); A screw rod (202a-4) is also rotatably plugged into the sliding seat (202a) on the side opposite to the connecting ear (202a-3); the screw rod (202a-4) is threadedly plugged into the threaded hole (201d-1), and a rotating handle (202a-3a) is also fixedly connected to the end thereof; A clamping inclined surface (X) is provided on the side of the clamping claw (202b) away from the connecting ear (202a-3), and the clamping inclined surface (X) abuts against the outer wall of the concrete test pile (A).

5. The concrete tensile testing device according to claim 3 or 4, characterized in that: The centering member (203) comprises symmetrically arranged mounting plates (203a) and a floating plate (203b) connected between the mounting plates (203a); the mounting plate (203a) is detachably connected to the middle outer wall of the slide plate (201c); a sliding sleeve (203a-1) is symmetrically fixedly connected to the outer wall away from the slide plate (201c); and the axis of the sliding sleeve (203a-1) is parallel to the displacement direction line of the concrete test pile (A).

6. The concrete tensile testing device according to claim 5, characterized in that: The floating plate (203b) is also symmetrically and fixedly connected to suspension rods (203b-1) at both ends thereof, and the suspension rods (203b-1) are slidably inserted into the sliding sleeves (203a-1); Anti-drop caps (203b-1a) are also fixedly connected to both ends of the suspension plug rod (203b-1), and a second spring (T2) is also sleeved on the suspension plug rod (203b-1), with both ends of the second spring (T2) respectively abutting against the anti-drop cap (203b-1a) and the sliding sleeve (203a-1).

7. The concrete tensile testing device according to claim 6, characterized in that: An auxiliary push piece (203c) is also slidably inserted in the floating plate (203b), and the auxiliary push piece (203c) comprises a cross plate (203c-1) and a rebound rod (203c-2) symmetrically fixed to the middle of a plate surface on one side thereof; The rebound rod (203c-2) is slidably inserted into the floating plate (203b), and the end of the rebound rod is fixedly connected to the rebound cap (203c-3). The rebound rod (203c-2) is also sleeved with a third spring (T3), and the two ends of the third spring (T3) are respectively in contact with the rebound cap (203c-3) and the floating plate (203b); The horizontal sections (203c-1a) of the cross plates (203c-1) on both sides abut against the outer walls of the concrete test pile (A) in the horizontal direction, and the vertical sections (203c-1b) of the cross plates (203c-1) abut against the outer walls of the concrete test pile (A) in the vertical direction.

8. The concrete tensile testing device according to any one of claims 2 to 4, 6 and 7, characterized in that: The support frame (102) comprises a top plate (102a) and a bottom plate (102b), and a plurality of groups of support rods (102c) are fixedly connected between the top plate (102a) and the bottom plate (102b); A height adjustment slideway (102b-1) is fixedly connected to the bottom plate (102b), and a height adjustment clamp (102b-2) is symmetrically slidably connected inside the height adjustment slideway (102b-1); The slide bar (201a) on the mounting member (201) at the bottom slides through the middle of the height-adjusting slideway (102b-1) and extends from the bottom plate (102b), and a pressure cap (201a-1) is fixedly connected to the end of the slide bar (201a) at the bottom.

9. The concrete tensile testing device according to claim 8, characterized in that: The inner walls of the height adjustment slideway (102b-1) on both sides opposite to each other are symmetrically provided with card insertion holes (102b-1a); the outer wall of the height adjustment card (102b-2) is symmetrically fixed with a card insertion board (102b-2a); the card insertion board (102b-2a) is slidably engaged in the card insertion hole (102b-1a); The end of the card insertion plate (102b-2a) is fixedly connected to a first rotating shaft (102b-2b), a connecting rod (102b-3) is rotatably sleeved outside the first rotating shaft (102b-2b), and the other end of the connecting rod (102b-3) is rotatably connected to a second rotating shaft (201b-2) symmetrically connected to the outer wall of the cover shell (201b).

10. The concrete tensile testing device according to claim 9, characterized in that: The bottom of the height-adjusting clamp (102b-2) is also fixedly connected to a limiting tooth plate (102b-2c), and the limiting tooth plate (102b-2c) passes through the bottom plate (102b) and extends out of the bottom plate (102b); The sliding rod (201a) at the bottom is slidably sleeved with a locking plate (102b-4) and a fourth spring (T4); two ends of the fourth spring (T4) are respectively in contact with the pressure cap (201a-1) and the locking plate (102b-4); a groove (102b-4a) is provided at the top of the locking plate (102b-4); a plurality of groups of tooth grooves (102b-4b) are arranged at the bottom of the groove (102b-4a); the limiting tooth plate (102b-2c) can be matched and placed in the groove (102b-4a); and the tooth block on the limiting tooth plate (102b-2c) is movably engaged with the tooth groove (102b-4b); The stretching hydraulic cylinder (300) is fixedly connected to the top of the top plate (102a), and the output end of the stretching hydraulic cylinder (300) is fixedly connected to the sliding rod (201a) on the mounting member (201) at the top.

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