Mold for testing drying shrinkage performance of concrete

Abstract

The utility model discloses a mold for testing the drying shrinkage performance of concrete, and relates to the technical field of molds. Comprising a bottom plate, a side part is installed at the top end of the bottom plate, two movable plates and two push plates are slidably connected to the inner wall of the side part, the two movable plates are located between the two push plates, springs are fixed between the movable plates and the push plates, displacement sensors are fixed to the sides, close to the movable plates, of the push plates, and the displacement sensors make contact with the movable plates. And a fixing mechanism is arranged between the bottom plate and the side piece. By rotating the knob, the knob drives the screw rod to rotate so as to push the push plate to move, the push plate can only move left and right under the limitation of the limiting rod, the push plate moves to enable the spring to extrude the moving plate, so that the moving plate is in contact with the two sides of concrete, and by recording data measured by the initial displacement sensor, the concrete begins to contract after being dried; the spring starts to expand to drive the moving plate to move to contact with two sides of the concrete, and the displacement sensor measures the moving distance of the moving plate.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically a mold for testing the drying shrinkage performance of concrete. Background Technology

[0002] A mold for testing the drying shrinkage properties of concrete is used to measure the volume change of concrete under drying conditions. It helps assess the degree of shrinkage during the drying process, thereby determining its durability and structural stability. This test can predict and control the risk of cracking and deformation in concrete during actual use. However, an existing mold for testing the drying shrinkage of concrete and a mechanism-amplified method for testing the drying shrinkage of concrete (publication number: C117347602A) have the following drawbacks in use:

[0003] During use, when concrete is poured into the mold, one end of the target is exposed, and the other end is embedded in the groove through the through hole. The target is fixedly connected to the through hole by a nut. After the cement-based material has cured, the two large side plates, two small side plates, and the nut need to be removed. The probe is fixedly connected to one end of the target. The probe, as the displacement output end of the concrete to be tested, is fixedly connected to the input end of the amplification mechanism before testing. Since the target is embedded in the cement, it is not easy to remove it after the cement has hardened. The target is not easy to reuse. Moreover, when demolding, the two large side plates, two small side plates, and the nut need to be removed in sequence, which is quite difficult to operate. Therefore, this patent proposes a mold for testing the drying shrinkage performance of concrete to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a mold for testing the drying shrinkage performance of concrete, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mold for testing the drying shrinkage performance of concrete, comprising a base plate, a side member installed on the top of the base plate, two movable plates and two push plates slidably connected to the inner wall of the side member, the two movable plates being located between the two push plates, a spring being fixed between the movable plates and the push plates, a displacement sensor being fixed on the side of the push plate near the movable plate, and a fixing mechanism being installed between the base plate and the side member.

[0006] Preferably, the fixing mechanism includes fixing plates fixed on both sides of the side member, connecting plates fixed on both sides of the bottom plate, a rotating rod rotatably connected to the top of the connecting plate, a connecting port through the bottom of the fixing plate, a limit block fixed to the top of the rotating rod, and the limit block and the rotating rod being adapted to the connecting port.

[0007] Preferably, both sides of the side member are threaded with screws, and a knob is fixed at one end of the screw located on the outside of the side member. The screw is rotatably connected to the push plate, and a limit rod is fixed on the side of the push plate away from the moving plate. The limit rod passes through the side member.

[0008] Preferably, a rod is fixed to the side of the movable plate near the push plate, the rod passes through the push plate, and the rod is located inside the spring.

[0009] Preferably, mounting plates are fixed at both ends of the top of the side member, and sliding grooves are provided at both ends of the push plate and the moving plate, with the mounting plates and sliding grooves being adapted to each other.

[0010] Preferably, the bottom end of the side member is provided with a slot, and the top end of the base plate is fixed with an insert strip, which is inserted into the slot.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] By rotating the knob, the screw rotates, which in turn pushes the push plate to move. Under the restriction of the limit rod, the push plate can only move left and right. The movement of the push plate causes the spring to compress the moving plate, making the moving plate contact the two sides of the concrete. By recording the data measured by the initial displacement sensor, when the concrete dries and begins to shrink, the spring begins to relax, causing the moving plate to move and contact the two sides of the concrete. The displacement sensor measures the distance the moving plate moves. Based on the difference between the measured distances, the drying shrinkage performance of the concrete can be calculated. This method does not require embedding the device in the concrete to measure the shrinkage performance of the concrete, so the device can be reused, avoiding waste of resources.

[0013] In addition, when demolding is required, the push plate moves to both sides by turning the knob in the opposite direction. The moving plate is no longer in contact with the concrete. Then, by rotating the limiting block, the limiting block is aligned with the connection port. At this time, the bottom plate can be moved downward to remove the concrete. The operation is relatively simple and makes it easier to demold the concrete. Attached Figure Description

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a top view of the present invention;

[0016] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle;

[0017] Figure 4 This is a schematic diagram showing the disassembled parts of this utility model.

[0018] In the diagram: 1. Base plate; 2. Side piece; 3. Moving plate; 4. Push plate; 5. Screw; 6. Knob; 7. Limiting rod; 8. Insert rod; 9. Spring; 10. Displacement sensor; 11. Mounting plate; 12. Fixing plate; 13. Connecting plate; 14. Connecting port; 15. Rotating rod; 16. Limiting block; 17. Insert strip; 18. Slot. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] A mold for testing the drying shrinkage performance of concrete is used to measure the volume change of concrete under drying conditions. It helps assess the degree of shrinkage during the drying process, thereby determining its durability and structural stability. This test allows for the prediction and control of cracking risks and deformation problems in concrete during actual use. The mold for testing the drying shrinkage performance of concrete provided by this invention uses a push plate 4 to move, causing a spring 9 to compress a moving plate 3, making the moving plate 3 contact both sides of the concrete. Data measured by the initial displacement sensor 10 is recorded. After the concrete dries and begins to shrink, the spring 9 relaxes, causing the moving plate 3 to move and contact the concrete. The displacement sensor 10 measures the distance the moving plate 3 moves. Based on the difference between the measured distances before and after the measurement, the drying shrinkage performance of the concrete can be calculated.

[0021] like Figure 1-Figure 4 As shown, this utility model provides a technical solution: a mold for testing the drying shrinkage performance of concrete, including a base plate 1, a side member 2 installed on the top of the base plate 1, two movable plates 3 and two push plates 4 slidably connected to the inner wall of the side member 2, the two movable plates 3 being located between the two push plates 4, a spring 9 fixed between the movable plates 3 and the push plates 4, a displacement sensor 10 fixed on the side of the push plate 4 near the movable plates 3, and a fixing mechanism installed between the base plate 1 and the side member 2. The fixing mechanism includes fixing plates 12 fixed on both sides of the side member 2, connecting plates 13 fixed on both sides of the base plate 1, a rotating rod 15 rotatably connected to the top of the connecting plate 13, a connecting port 14 penetrating the bottom end of the fixing plate 12, a limiting block 16 fixed to the top of the rotating rod 15, the limiting block 16 and the rotating rod 15 being adapted to the connecting port 14, and the bottom end of the limiting block 16 contacting the top end of the fixing plate 12.

[0022] It should be noted that by moving the movable plate 3 to contact both sides of the concrete and compressing the spring 9, the data measured by the initial displacement sensor 10 is recorded. When the concrete dries and begins to shrink, the spring 9 begins to relax, causing the movable plate 3 to move and contact both sides of the concrete. The displacement sensor 10 measures the distance the movable plate 3 moves. Based on the difference between the measured distances before and after, the drying shrinkage performance of the concrete can be calculated, making the measurement more convenient. In addition, when it is necessary to remove the concrete, the push plate 4 is moved to both sides, and the movable plate 3 is no longer in contact with the concrete. Then, by rotating the limiting block 16, the limiting block 16 is aligned with the connection port 14. At this time, the bottom plate 1 can be moved downward to remove the concrete. The operation is relatively simple.

[0023] like Figure 2 and Figure 4 As shown, screw rods 5 are threaded through both sides of side member 2. A knob 6 is fixed to the end of the screw rod 5 located on the outer side of side member 2. The screw rod 5 is rotatably connected to push plate 4. A limit rod 7 is fixed to the side of push plate 4 away from moving plate 3, and the limit rod 7 passes through side member 2. An insert rod 8 is fixed to the side of moving plate 3 near push plate 4. The insert rod 8 passes through push plate 4 and is located inside spring 9. Mounting plates 11 are fixed to both ends of the top of side member 2. Slide grooves are opened at both ends of push plate 4 and moving plate 3, and mounting plates 11 are adapted to slide grooves. A slot 18 is opened at the bottom of side member 2. An insert strip 17 is fixed to the top of bottom plate 1 and is inserted into slot 18.

[0024] It should be noted that by rotating the knob 6, the knob 6 drives the screw 5 to rotate, thereby pushing the push plate 4 to move. The push plate 4 can only move left and right under the restriction of the limit rod 7. The movement of the push plate 4 causes the spring 9 to squeeze the moving plate 3, so that the moving plate 3 contacts the two sides of the concrete. The insert rod 8 limits the spring 9 to prevent it from deviating.

[0025] Working principle: First, concrete is placed on the base plate 1. Then, by rotating the knob 6, the screw 5 rotates, which in turn pushes the push plate 4 to move. The push plate 4 can only move left and right under the restriction of the limit rod 7. The movement of the push plate 4 causes the spring 9 to compress the moving plate 3, so that the moving plate 3 contacts the two sides of the concrete. By recording the data measured by the initial displacement sensor 10, when the concrete dries and begins to shrink, the spring 9 begins to relax and drive the moving plate 3 to move. The displacement sensor 10 measures the distance the moving plate 3 moves. Based on the difference between the measured distances, the drying shrinkage performance of the concrete can be calculated. After the calculation is completed, by rotating the knob 6 in the opposite direction, the push plate 4 moves to both sides, and the moving plate 3 no longer contacts the concrete. Then, by rotating the limit block 16, the limit block 16 is aligned with the connection port 14. At this time, the base plate 1 can be moved downward to remove the concrete. The operation is relatively simple.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A mold for testing the drying shrinkage performance of concrete, comprising a base plate (1), characterized in that: A side piece (2) is installed at the top of the base plate (1). Two movable plates (3) and two push plates (4) are slidably connected to the inner wall of the side piece (2). The two movable plates (3) are located between the two push plates (4). A spring (9) is fixed between the movable plates (3) and the push plates (4). A displacement sensor (10) is fixed on the side of the push plate (4) near the movable plates (3). A fixing mechanism is installed between the base plate (1) and the side piece (2).

2. The mold for testing the drying shrinkage performance of concrete according to claim 1, characterized in that: The fixing mechanism includes fixing plates (12) fixed on both sides of the side member (2), connecting plates (13) fixed on both sides of the bottom plate (1), rotating rods (15) rotatably connected to the top of the connecting plates (13), connecting ports (14) are opened through the bottom of the fixing plates (12), and limiting blocks (16) are fixed to the top of the rotating rods (15). The limiting blocks (16) and the rotating rods (15) are adapted to the connecting ports (14).

3. The mold for testing the drying shrinkage performance of concrete according to claim 1, characterized in that: Both sides of the side member (2) are threaded with screw rods (5). A knob (6) is fixed at one end of the screw rod (5) located outside the side member (2). The screw rod (5) is rotatably connected to the push plate (4). A limit rod (7) is fixed on the side of the push plate (4) away from the moving plate (3). The limit rod (7) passes through the side member (2).

4. The mold for testing the drying shrinkage performance of concrete according to claim 1, characterized in that: The movable plate (3) has a rod (8) fixed on the side near the push plate (4). The rod (8) passes through the push plate (4) and is located inside the spring (9).

5. The mold for testing the drying shrinkage performance of concrete according to claim 1, characterized in that: The top two ends of the side member (2) are fixed with mounting plates (11), and the two ends of the push plate (4) and the moving plate (3) are provided with sliding grooves, and the mounting plate (11) is adapted to the sliding grooves.

6. The mold for testing the drying shrinkage performance of concrete according to claim 1, characterized in that: The bottom end of the side member (2) is provided with a slot (18), and the top end of the base plate (1) is fixed with a strip (17), which is inserted into the slot (18).

Images