Concrete slump testing device

Abstract

The utility model discloses a concrete slump testing device, which is used for solving the problem that a conical barrel locally deforms a concrete sample due to non-uniform force application in the process of lifting the conical barrel. The device comprises a bottom plate, a conical barrel, inclined supports, screw rods and stand columns, the two stand columns are fixed to the bottom plate, the upper ends of the stand columns are connected with the screw rods through threads, the two adjusting mechanisms composed of the inclined supports, the stand columns and the screw rods are arranged on the left side and the right side of the conical barrel, and a bearing is limited at the middle section of each screw rod through an upper nut and a lower nut. The bearing is sleeved with a steel ring, the steel ring is welded and fixed to one end of an inclined support, and the other end of the inclined support is welded and fixed to the conical barrel. According to the device, through even a double-screw operation structure, the conical barrel can be synchronously lifted, deviation is avoided, and the problem that the conical barrel is prone to deviation in the conical barrel lifting process of an existing device is well solved.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction technology. Background Technology

[0002] Slump is an important indicator of concrete. On the construction site, slump tests are conducted on each batch of concrete. The current experimental device is a cone. The test process is as follows: a cone-shaped cone with an upper opening of 100mm, a lower opening of 200mm, and a height of 300mm is prepared. Concrete is filled in three times. After each filling, a tamping hammer is used to evenly tamp the cone 25 times from the outside to the inside along the wall of the cone. After compaction, the cone is smoothed and then lifted. The concrete collapses due to its own weight. The slump is calculated by subtracting the height of the highest point of the concrete after collapse from the height of the cone (300mm).

[0003] For example, CN110780060A discloses a novel slump test device. This device consists of two rotating semi-conical cylinders. When closed, concrete can be poured into them. After completion, the two semi-conical cylinders can be rotated to expose the formed concrete for testing. This design is simple, and the rotation prevents the semi-conical cylinders from tilting, ensuring a more stable slump test with exposed concrete and minimizing the impact on the concrete's shape. However, this technology also suffers from structural complexity and inconvenient cleaning. Furthermore, as a single-piece structure, it is susceptible to impact deformation during handling and transportation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a concrete slump testing device, which solves the problem of uneven force application during the lifting of the cone in existing testing devices, causing localized deformation of the concrete sample by the cone.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] A concrete slump testing apparatus, comprising a base plate, a conical cylinder, an inclined support, a screw rod, and a column, characterized in that:

[0007] Two columns are fixed to the base plate. The upper end of each column has a threaded hole, through which a screw rod is installed. The adjustment mechanism, consisting of the inclined support, columns, and screw rods, comprises two components, one on the left and one on the right, positioned on either side of the conical cylinder.

[0008] A bearing is defined in the middle section of the screw by two nuts, one above and one below. A steel ring is fitted on the bearing and welded to one end of an inclined support. The other end of the inclined support is welded to a conical cylinder.

[0009] Furthermore, the conical cylinder is made of stainless steel plate, with an upper opening of 100mm, a lower opening of 200mm, and a height of 300mm.

[0010] Furthermore, the lower opening of the conical cylinder has an outward-flared edge.

[0011] Furthermore, a limiting hole is drilled between the nut and the screw, and the nut is fixed to the screw by a steel pin.

[0012] Furthermore, the base plate is made of stainless steel.

[0013] Furthermore, the upper end of the screw is an operating handwheel.

[0014] The beneficial effects of this utility model are:

[0015] This device, through its unique twin-screw operating structure, can simultaneously lift the conical cylinder, avoiding deviation and effectively solving the problem of deviation that easily occurs in existing devices during the lifting process.

[0016] The conical cylinder and the base plate in this device can be completely separated, making it easy to clean. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the device.

[0018] Figure 2 This is a top view of the device.

[0019] Figure 3 This is a diagram showing the usage status of this device.

[0020] Figure 4 This is a diagram showing the usage status of this device.

[0021] Figure 5 This is a diagram showing the usage status of this device.

[0022] Figure 6 This is a diagram showing the connection between the screw and the inclined support.

[0023] Figure 7 This is a structural diagram of the screw.

[0024] In the picture:

[0025] 10 base plates, 11 columns.

[0026] 20 Screw, 21 Nut, 22 Bearing

[0027] 30 diagonal support, 31 steel ring,

[0028] 40 Conical cylinder. Detailed Implementation

[0029] This embodiment aims to provide a detailed description of the working process in conjunction with the specific structure of the device.

[0030] This concrete slump test apparatus includes a base plate, a conical cylinder, an inclined support, a screw rod, and a column, which are described in detail in conjunction with the instruction manual.

[0031] The aforementioned base plate 10 is made of stainless steel, specifically a rectangular stainless steel plate. Holes are drilled in the base plate 10, and two uprights 11 are fixed to it with fastening screws. The two uprights are positioned one on the left and one on the right. Specifically, each upright has threaded holes at both ends. The threaded hole at the lower end of the upright is fixed to the base plate with fastening screws, while the threaded hole at the upper end of the upright 11 is a long threaded hole with a thread stroke of not less than 20 centimeters. The uprights are vertically positioned, perpendicular to the base plate below. A screw rod 20 is threadedly connected to each upright. This screw rod is a rod with a threaded section at its lower end, and its upper end is an operating handwheel, designed for easy gripping.

[0032] At the middle section of the screw 20, a bearing 22 is secured by two nuts 21. Specifically, a bearing is secured to the middle of the screw by the two nuts. A limiting hole is drilled between the two nuts and the screw, and the two nuts 21 are completely fixed to the screw using steel pins. A diagonal support 30 is pre-fitted onto the bearing between the two nuts. The diagonal support 30 is a rod with a steel ring 31 welded to its upper end. The steel ring and the bearing are fitted together, meaning the upper end of the diagonal support 30 is movably mounted in the middle of the screw via the bearing. It is easy to understand that by operating the screw with one hand and rotating it, the bearing rotates freely and changes in height with the distance between the screw and the column. In other words, by rotating the screw, the height of the diagonal support can be adjusted.

[0033] The conical cylinder 40 is made of stainless steel plate, with an upper opening of 100mm, a lower opening of 200mm, and a height of 300mm. The dimensions of the conical cylinder meet the requirements of the slump test manual. The larger opening of the conical cylinder faces downward and the smaller opening faces upward. The outer ends of the conical cylinder are welded and fixed to the left and right inclined supports respectively. That is, the lower ends of the left and right inclined supports are fixed to the conical cylinder by welding.

[0034] The lower opening of the conical cylinder 40 has an outward flange, which can effectively increase the contact area with the base plate and improve the sealing effect with the base plate.

[0035] The aforementioned adjustment mechanism, consisting of an inclined support, a column, and a screw, consists of two parts, one on the left and one on the right, arranged on both sides.

[0036] The specific slump verification process using this device is as follows:

[0037] The test procedure was as follows: First, the screw was operated with both hands, and the screw handle was rotated clockwise to press and fix the conical cylinder onto the base plate 10. The conical cylinder 40 had good stability. Then, the concrete was filled in three times. After each filling, the concrete was tamped dozens of times evenly from the outside to the inside along the inner wall of the conical cylinder with a tamping hammer. After tamping, the surface was smoothed. Then, the screw handle was rotated counterclockwise with both hands simultaneously to lift the conical cylinder until it was completely removed. The process and data of the concrete slumping due to its own weight were observed, measured, and recorded. The slump was calculated by subtracting the height of the highest point of the concrete after slumping from the height of the bucket (300mm).

[0038] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Without departing from the spirit of the present utility model, all modifications and improvements to the present utility model by those skilled in the art should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A concrete slump test device, comprising a base plate, a cone, an inclined support, a screw and a column, characterized in that: Two columns (11) are fixed on the bottom plate (10), the upper ends of the columns (11) are threaded holes and screw rods (20) are installed through threaded connection, the number of adjustment mechanisms consisting of the oblique support, the columns and the screw rods is two, one is arranged on the left and the other is arranged on the right sides of the conical cylinder (40), and a bearing (22) is defined by upper and lower nuts (21) in the middle part of the screw rod (20), a steel ring (31) is sleeved on the bearing, and the steel ring is welded and fixed to one end of the oblique support (30), and the other end of the oblique support is welded and fixed to the conical cylinder.

2. The concrete slump test device according to claim 1, characterized in that: The conical cylinder is made of stainless steel plate, with an upper opening of 100 mm, a lower opening of 200 mm and a height of 300 mm.

3. The concrete slump test device according to claim 1 or 2, characterized in that: The lower opening of the conical cylinder (40) has an outer flange.

4. The concrete slump test device according to claim 1, characterized in that: A limiting hole is drilled between the nut and the screw rod, and the nut is fixed on the screw rod by a steel pin.

5. The concrete slump test device according to claim 1, characterized in that: The bottom plate (10) is a stainless steel plate.

6. The concrete slump test device according to claim 1, characterized in that: The upper end of the screw rod is an operating hand wheel.

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