Light aggregate concrete test piece preparation device for controlling spatial uniformity of aggregate

Abstract

The utility model discloses a kind of light aggregate concrete test piece preparation devices of controlling aggregate space uniformity, including main body mould, 6 groups of grid tube, concrete vibration table, automatic plug device composition, 6 groups of sealing plug. Main body mould side surface is equipped with multiple rows of through holes;Grid tube is inserted into mould interior by through hole, forms layered constraint grid, limits light aggregate floating range;Sealing plug is used to block through hole after vibrating;Automatic plug device is inserted by electric telescopic link and electromagnet adsorption structure realization grid tube grouping synchronous plug. Layered filler is vibrated and inserted into grid tube constraint when operating, finally replace sealing plug to complete dense forming. The utility model can solve the problem that light aggregate is exposed, accumulated and deviated due to floating with vibration, so that slurry bubble is fully discharged, and vibration is more uniform.

Description

Technical Field

[0001] This utility model relates to the field of lightweight aggregate concrete preparation, and in particular to a device for preparing lightweight aggregate concrete specimens that controls the spatial uniformity of aggregates. Background Technology

[0002] Lightweight aggregate concrete is typically prepared by using recycled lightweight aggregates from industrial waste such as expanded clay and expanded clay sand to partially or completely replace the coarse and fine aggregates of the corresponding particle size in ordinary concrete. It offers advantages such as lightweight yet high strength, thermal insulation, energy saving, and environmental friendliness. Currently, lightweight aggregate concrete is widely used in bridge, building, and other construction projects.

[0003] During the pouring and molding process of lightweight aggregate concrete, due to the density differences between lightweight aggregate, cement paste, and conventional aggregate, lightweight aggregate will slowly "float" vertically in the cement paste under static conditions. This "floating" phenomenon is particularly pronounced during vibration molding. For laboratory specimen preparation of lightweight aggregate concrete, the "floating" phenomenon makes it easier to produce poor specimen uniformity and significant differences between specimens, ultimately leading to discrepancies between experimental results and actual conditions, and a large degree of dispersion in parallel experimental results.

[0004] Currently, existing technologies use methods such as pumping slurry to prepare precast components to prevent lightweight aggregates from floating in an unconstrained state. However, excessive constraint on the specimens during sample preparation can lead to problems such as insufficient air bubble discharge and uneven vibration in the slurry. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a lightweight aggregate concrete specimen preparation device that controls the spatial uniformity of aggregates, addressing the shortcomings of the prior art. By setting up a main mold, grid tube, automatic insertion and extraction device, concrete vibration table and sealing plug, the lightweight aggregate concrete is vibrated in layers, which solves the problems of aggregate exposure, accumulation and displacement caused by the lightweight aggregate floating up with vibration during the process of preparing lightweight aggregate concrete specimens. It also allows the slurry air bubbles to be fully discharged and the vibration to be more uniform.

[0006] To solve the above-mentioned technical problems, the technical solution adopted in this application is:

[0007] A device for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity includes a main mold, a grid tube, an automatic insertion and extraction device, a concrete vibration table, and a sealing plug.

[0008] The main mold is used to fill lightweight aggregate concrete. The main mold is set on a concrete vibrating table, which vibrates the lightweight aggregate concrete.

[0009] The main mold has n layers of through holes on each of its two adjacent sides, n≥1, and each layer has m through holes, m≥1; a grid tube is horizontally inserted into each through hole, and a sealing ring is fitted on the grid tube. The grid tubes on the two adjacent sides of the same layer intersect to form a grid mesh in the main mold.

[0010] The automatic insertion and removal device includes a fixed bracket, an electric telescopic rod, and a grid tube base.

[0011] Each layer of grid tube is equipped with a corresponding grid tube base. One end of the grid tube base is detachably connected to the grid tube, and the other end is connected to the electric telescopic rod. The other end of the electric telescopic rod is installed on a fixed bracket, which is set on a concrete vibration table.

[0012] Sealing plugs are used to seal through holes.

[0013] Preferably, the main mold is a hollow hexahedral structure with an open top surface.

[0014] Preferably, the bottom surface of the main mold is provided with air vents to cooperate with the high-pressure air gun to complete the demolding of the specimen, and two ribs are provided on each of the four sides to withstand the lateral pressure generated during concrete molding.

[0015] Preferably, the spacing between two adjacent through holes in each layer is less than the minimum particle size of the lightweight aggregate.

[0016] Preferably, the grating tube is a stainless steel round tube.

[0017] Preferably, the sealing ring is a frustum-shaped rubber ring with its upper bottom surface fixed to the grid tube.

[0018] Preferably, the base of the grid tube is provided with m slots, and a miniature electromagnet is embedded at the bottom of each slot for connecting the grid tube.

[0019] Preferably, the sealing plug is a frustum-shaped rubber plug.

[0020] Preferably, the fixed bracket is an L-shaped bracket consisting of a base plate and side plates, with the base plate fixed on the concrete vibration table and the side plates connected to the electric telescopic rod.

[0021] Preferably, the vibration frequency of the concrete vibrating table is set to 50Hz.

[0022] This application has the following beneficial effects:

[0023] 1. Compared with commonly used sample preparation methods, this utility model incorporates an internal grid consisting of several layers of through-grid tubes within the main template to constrain the upward movement of lightweight aggregates. This ensures that during vibration, the lightweight aggregates only float within their own layered areas, guaranteeing the overall uniformity of the aggregates in the molded sample. Simultaneously, rubber plugs are used to seal the through holes, preventing cement slurry leakage during molding and ensuring the smoothness of the specimen's sides does not affect the demolding process.

[0024] 2. This utility model uses a multi-layer grid tube to form a grid mesh, which can ensure the layered vibration of lightweight aggregate concrete and allow air bubbles to be fully discharged from the grid mesh layer by layer, making the overall material more uniform and ensuring the quality of the prepared specimens.

[0025] 3. The through hole of this utility model is small in size. The lightweight aggregate concrete has low fluidity and is not easy to leak in the through hole, which is convenient for operation. At the same time, the grid tube is equipped with a sealing ring to ensure the sealing of the layered vibration. Finally, the grid tube is sealed with a sealing plug after being pulled out to ensure the sealing of the demolding process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a device for preparing lightweight aggregate concrete specimens that controls the spatial uniformity of aggregates.

[0027] Figure 2 This is a schematic diagram of the automatic insertion and removal device for grid tubes.

[0028] Figure 3 A schematic diagram of the through-hole on the side of the main mold.

[0029] Figure 4 This is a schematic diagram of a grid tube structure.

[0030] Figure 5 This is a schematic diagram of inserting a rubber stopper.

[0031] Figure 6 This is a partial schematic diagram of the electromagnet at the base of the grid tube.

[0032] In the picture:

[0033] 1. Main mold; 101. Through hole;

[0034] 2. Grille pipe; 201 stainless steel pipe; 202 sealing ring;

[0035] 3. Automatic insertion and removal device; 301. Fixed bracket; 302. Electric telescopic rod; 303. Grille tube base;

[0036] 4. Concrete vibrating table; 5. Sealing plug;

[0037] 6. Electromagnet; 601. Iron core; 602. Coil. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0039] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0040] like Figures 1-6 As shown, a lightweight aggregate concrete specimen preparation device for controlling the spatial uniformity of aggregates includes a main mold 1, a grid tube 2, an automatic insertion and extraction device 3, a concrete vibration table 4, and a sealing plug 5.

[0041] The main mold 1 is a hollow hexahedral structure with an open top surface. An air vent is provided on the bottom surface to cooperate with the high-pressure air gun to demold the specimen. Two ribs are provided on each of the four sides to withstand the lateral pressure generated during concrete molding. The side wall thickness of the main mold 1 is 6mm. The bottom surface of the main mold 1 is fixed on the concrete vibration table 4.

[0042] Preferably, the hollow area inside the main mold 1 is a standard cube of 100mm×100mm×100mm. This application uses this size as the design basis, but it can be adjusted according to the size of the pre-made sample.

[0043] Several through holes 101 are opened on two adjacent sides of the main mold 1. Each side has n layers of through holes 101, where n ≥ 1. Each layer has m through holes 101, where m ≥ 1. The through holes 101 are arranged in an array. In this embodiment, the arrangement is as follows: each side has 3 layers of through holes 101. The 3 layers of through holes 101 on one side are located at 1 / 4, 2 / 4, and 3 / 4 of the longitudinal length of the side, respectively. The other side has the same 3 layers of through holes 101. The position of each layer of through holes 101 is slightly lower than 1 / 4, 2 / 4, and 3 / 4 of the longitudinal length of the side to avoid collision between the grid tubes 2 passing through the through holes 101 on both sides. Each layer has 9 through holes 101. The spacing between adjacent through holes 101 in each layer is between 10 mm and 12 mm. A total of 27 through holes 101 are provided on each side.

[0044] The diameter of the through hole 101 is 4.3 mm, penetrating the side wall of the template with a wall thickness of 6 mm; the several through holes 101 opened on the side of the main mold 1 can satisfy the floating of lightweight aggregates with a minimum particle size greater than 10 mm. The longitudinal layer number, quantity and spacing of the through holes 101 can be adjusted according to the sample size and aggregate particle size. The design principle is: the spacing between two adjacent through holes 101 in each layer (the spacing between the circular holes of two adjacent through holes 101 in each layer - the diameter of the stainless steel pipe 201) < the minimum particle size of the lightweight aggregate.

[0045] Figure 3 The specific dimensions and positions of the through holes in this embodiment are shown. The distance between the centers of two adjacent through holes 101 is set to 10.85mm or 12mm. The distance from the center of the first through hole 101 on the left to the side is 4.15mm, and the distance from the center of the first through hole 101 on the right to the side is 4.15mm. Each side of the main mold 1 has two ribs. The distance from the center of the third through hole 101 on the left and the third through hole 101 on the right to the adjacent rib is 2.15mm, and the distance from the center of the fourth through hole 101 on the left and the fourth through hole 101 on the right to the adjacent rib is 5.5mm. From bottom to top, the distance from the center of the first layer of through holes 101 to the bottom edge is 31mm. The distance between the centers of the first and second layers of through holes 101 is 25mm, the distance between the centers of the second and third layers of through holes 101 is 25mm, and the distance from the center of the third layer of through holes 101 to the top edge is 23mm. The total length of the side of the main mold 1 is 104mm.

[0046] The grating tube 2 is preferably a stainless steel round tube with a diameter of 4mm and a length of 200mm. It can be inserted into the main mold 1 through the through hole 101. A sealing ring 202 is fitted in the middle of the grating tube 2. The sealing ring 202 is preferably a frustum-shaped rubber ring with a length of 20mm, an upper bottom diameter of 4mm, and a lower bottom diameter of 10mm. The rubber ring is elastic and can be fixedly fitted at 90mm of the length of the grating tube 2. When the grating tube 2 is inserted into the through hole 101, the upper bottom surface of the rubber ring is also inserted into the through hole 101 until the gap of the through hole 101 is completely filled to prevent liquid leakage. At this time, the first end of the grating tube 2 is just close to the inner surface of the other side of the mold, with a gap of less than 10mm.

[0047] The number and arrangement of the grid tubes 2 correspond one-to-one with the through holes 101. One grid tube 2 is inserted into each through hole 101. In this case, nine grid tubes 2 are arranged as one layer, with a total of six layers. Three layers are arranged on each side. The grid tubes 2 on adjacent sides of the same layer intersect to form a grid mesh in the main mold 1. The side length of the grid mesh is the spacing between adjacent through holes 101. The grid mesh can constrain the lightweight aggregate and discharge air bubbles.

[0048] The automatic insertion and removal device 3 includes a fixed bracket 301, an electric telescopic rod 302, and a grid tube base 303, which are used to control the insertion and removal of the grid tube 2 in the main body mold 1.

[0049] The fixed bracket 301 is an L-shaped bracket consisting of a base plate and a side plate. The side plate is located at the front of one side of the main mold 1, and the base plate is fixed on the concrete vibration table 4. A total of two fixed brackets 301 are provided. The electric telescopic rod 302 is preferably a small electric telescopic rod. Its motor end is fixed to the side plate, and the top of the push rod is connected to the grid tube base 303. By adjusting the extension and retraction of the electric telescopic rod, the movement of each grid tube base 303 can be controlled, thereby controlling the insertion and removal of the grid tube 2.

[0050] The grid tube base 303 has a row of nine cylindrical slots on its end face facing the main mold 1. The slot positions correspond one-to-one with the positions of the grid tubes 2. A miniature electromagnet 6 is embedded at the bottom of each slot. When the electromagnet 6 is energized, it can attract the tail end of the grid tube 2, allowing the grid tube 2 to be horizontally connected to the grid tube base. Figure 6 As shown, the electromagnet 6 consists of an iron core 601 and two sets of coils 602. When the two sets of coils 602 are energized, the force generated can attract the grid tube 2 into the grid tube base 303. The inner diameter of the slot is set to 5mm, slightly larger than the diameter of the grid tube 2 (4mm), to ensure that the grid tube 2 can be embedded. The depth of the slot is 20mm.

[0051] Three grid tube bases 303 are arranged in parallel on the side plate of each fixed bracket 301. One grid tube base is set for each layer of grid tubes 2 (9 tubes). Each grid tube base is controlled by a set of electric telescopic rods 302 to realize the synchronous insertion and removal of each layer of grid tubes 2 (9 tubes). Each layer of grid tubes 2 is controlled in layers.

[0052] The sealing plug 5 is preferably a frustum-shaped rubber plug, used to seal the through hole 101 after the grid tube 2 is pulled out; one rubber plug is provided for each through hole 101, and the rubber plugs are divided into 6 groups, with 9 plugs in each group. The rubber plug has a head diameter of 4mm, a tail diameter of 10mm, and a length of 20mm. In use, the head of the rubber plug is inserted into the through hole 101 until the gap in the round hole is completely filled. The size of the rubber plug is adjusted according to the size of the through hole and the thickness of the outer wall of the template.

[0053] The method of using this utility model is as follows:

[0054] (1) Install grid tube 2: Power on electromagnet 6 and insert grid tube 2 into the corresponding grid tube base;

[0055] (2) Insertion of the first layer of grid tube 2: Start the electric telescopic rod with a stroke of 90mm, insert the first layer of grid tube 2 on the two adjacent sides into the main body mold 1 through the through hole 101. After the grid tube 2 is in place, the rubber ring fills the gap of the through hole 101, and the grid tube 2 on the two sides intersect to form a grid mesh.

[0056] (3) Filling and Vibration of the First Layer of Concrete: The well-mixed lightweight aggregate concrete is filled into the main mold 1, with the filling height controlled at about 1 / 4 of the main mold 1, lower than the height of the first layer of grid pipe 2. The vibration table is set to a vibration frequency of 50Hz and vibrated for 15s. At this time, because the particle size of the lightweight aggregate is larger than the size of the grid mesh, it only floats up and down in the first layer area during vibration.

[0057] (4) Installation of the second layer grid tube 2: Repeat step (2) to complete the installation of the second layer grid tube 2.

[0058] (5) Filling and vibrating the second layer of concrete: Repeat the operation of step (3). The filling height of the lightweight aggregate concrete is controlled at about 2 / 4 of the main mold 1, which is lower than the height of the second layer of grid pipe 2. The vibration frequency is set at 50Hz and the vibration lasts for 15 seconds.

[0059] Because the lightweight aggregate in the first layer has a larger particle size than the grid mesh, it is confined to the area of ​​the first layer during vibration and will not float up into the area of ​​the second layer, thus ensuring the uniformity of the aggregate in each layer. Meanwhile, the air bubbles generated by the vibration can float up from the grid mesh layer by layer and be discharged smoothly, ensuring the full discharge of air bubbles in each layer.

[0060] (6) Referring to steps (4) and (5), the third layer of grid pipe 2 is inserted, the third layer of concrete is filled and vibrated, and the fourth layer of concrete is filled and vibrated in sequence. The third layer of concrete is filled to a height of about 3 / 4, and the fourth layer of concrete fills the entire main body mold 1.

[0061] (7) Remove the grid tube 2 and the channel plug: Start the electric telescopic rod, pull out the grid tube 2, and insert the rubber plug. Turn off the power to the electromagnet 6, and remove the grid tube 2 for safekeeping.

[0062] (8) Final vibration and curing demolding: Fill a small amount of concrete into the top of the mold, turn on the vibrating table again (50Hz), and perform final vibration on the concrete in the entire mold for 30 seconds. Let stand for 24 hours to wait for demolding.

[0063] This utility model provides a device to prevent aggregate from floating during the preparation of lightweight aggregate concrete specimens, so as to ensure the uniformity of aggregate distribution inside the specimen and control the dispersion of differences between parallel specimens, so as to achieve the purpose of simple preparation method, good molding effect and stable casting quality. It can restrain the floating of lightweight aggregate while ensuring sufficient vibration, sufficient air bubble discharge and simple and easy operation.

[0064] The preferred embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various equivalent transformations can be made to the technical solution of this application, and all such equivalent transformations fall within the protection scope of this application.

Claims

1. A device for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity, characterized in that: Includes main mold, grid pipe, automatic insertion and extraction device, concrete vibrating table and sealing plug; The main mold is used to fill lightweight aggregate concrete. The main mold is set on a concrete vibrating table, which vibrates the lightweight aggregate concrete. The main mold has n layers of through holes on each of its two adjacent sides, n≥1, and each layer has m through holes, m≥1; a grid tube is horizontally inserted into each through hole, and a sealing ring is fitted on the grid tube. The grid tubes on the two adjacent sides of the same layer intersect to form a grid mesh in the main mold. The automatic insertion and removal device includes a fixed bracket, an electric telescopic rod, and a grid tube base; Each layer of grid tube is equipped with a corresponding grid tube base. One end of the grid tube base is detachably connected to the grid tube, and the other end is connected to the electric telescopic rod. The other end of the electric telescopic rod is installed on a fixed bracket, which is set on a concrete vibration table. Sealing plugs are used to seal through holes.

2. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The main mold is a hollow hexahedral structure with an open top surface.

3. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 2, characterized in that: The bottom surface of the main mold is provided with air vents to cooperate with the high-pressure air gun to complete the demolding of the specimen. Two ribs are provided on each of the four sides to withstand the lateral pressure generated during concrete molding.

4. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The spacing between two adjacent through holes in each layer is less than the minimum particle size of the lightweight aggregate.

5. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The grating tube is a stainless steel round tube.

6. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The sealing ring is a frustum-shaped rubber ring.

7. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The base of the grid tube is provided with m slots, and a miniature electromagnet is embedded at the bottom of each slot for connecting the grid tube.

8. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The sealing plug is a frustum-shaped rubber plug.

9. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The fixed bracket is an L-shaped bracket consisting of a base plate and side plates. The base plate is fixed on the concrete vibration table, and the side plates are connected to the electric telescopic rod.

10. The apparatus for preparing lightweight aggregate concrete specimens with controlled aggregate spatial uniformity according to claim 1, characterized in that: The vibration frequency of the concrete vibrating table is set to 50Hz.

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