Hmac high modulus asphalt concrete test piece forming mold

Abstract

The utility model provides a kind of HMAC high modulus asphalt concrete test piece forming mould, including the mould body of upside opening arrangement, the bottom of the inner chamber of mould body is equipped with recess, the edge of recess and the edge of the inner chamber of mould body are spaced apart, detachable bottom plate is adaptively connected in recess, the knock hole of being penetrated through the downside of mould body is equipped in the bottom of recess, gas hole is equipped with being penetrated through the upside and downside of it on bottom plate, gas hole is located in the area of knock hole. Its detachable bottom plate is arranged in the bottom of mould body, so even if bottom plate is knocked and broken, bottom plate can be replaced, since only bottom plate needs to be replaced, so replacement cost is low.

Description

Technical Field

[0001] This utility model relates to the technical field of concrete testing equipment, specifically to a molding die for HMAC high modulus asphalt concrete test specimens. Background Technology

[0002] High modulus asphalt concrete (HMAC) is increasingly widely used in road engineering due to its high dynamic modulus and excellent high-temperature stability. The molding quality of HMAC specimens directly affects the accuracy of its mechanical property tests, such as key indicators like dynamic modulus and fatigue life. However, the demolding process of traditional molding molds still has its shortcomings.

[0003] Existing concrete test molds mostly use an open-top, one-piece box, which has the disadvantage of being non-removable. By setting a small hole at the bottom of the concrete test mold, when removing the concrete test block, the test block needs to be inverted, and air needs to be blown into the concrete test mold through the small hole to assist in removing the test block.

[0004] However, sometimes blowing air may not be enough to demold, or there may be no air blowing equipment on site. In such cases, it is necessary to tap the bottom of the mold to assist in demolding through vibration. However, tapping the bottom of the mold may damage the bottom of the mold. Utility Model Content

[0005] In view of the problems pointed out in the background art, this utility model proposes a molding die for HMAC high modulus asphalt concrete test specimens to solve the above-mentioned technical problems.

[0006] The technical solution of this utility model is implemented as follows:

[0007] A molding die for HMAC high modulus asphalt concrete test specimens includes a die body with an opening on the upper side. The bottom of the inner cavity of the die body is provided with a groove, the edge of the groove is spaced apart from the edge of the inner cavity of the die body, and a detachable base plate is adapted to be connected in the groove. The bottom of the groove is provided with a hammering hole penetrating the lower side of the die body, and the base plate is provided with air holes penetrating its upper and lower sides, the air holes being located in the area where the hammering hole is located.

[0008] By adopting the above technical solution, when demolding cannot be completed by blowing air through the air holes on the base plate, demolding can be completed by tapping the base plate. Since the base plate is a detachable structure, even if the base plate is damaged by tapping, a new base plate can be replaced. And it is only a matter of replacing one base plate, so the replacement cost is low.

[0009] The edges of the groove are spaced apart from the edges of the inner cavity of the mold body, so that the edges of the base plate are spaced apart from the edges of the inner cavity of the mold body. In this way, the edges of the base plate will not get stuck with the inner sidewall of the mold body during demolding.

[0010] The present invention is further configured such that the diameter of the air pores gradually increases from top to bottom.

[0011] By adopting the above technical solution, the air nozzle of the air blowing device is inserted into the air hole, and the air nozzle is held by hand and pressed against the inner peripheral wall of the air hole to form a seal, so as to blow air and assist in demolding.

[0012] The present invention is further configured such that the mold body is made of plastic.

[0013] The present invention is further configured such that the base plate is made of metal material.

[0014] By adopting the above technical solution, the mold body made of plastic can be reused, and the base plate can be made of plastic or metal. The plastic base plate has low manufacturing cost and can be replaced when it is damaged by knocking; the metal base plate has high structural strength, is difficult to be damaged by knocking, and can be reused.

[0015] The present invention is further configured such that an installation groove is provided on the inner side wall of the mold body along the vertical direction, and a sliding strip is adapted to be installed in the installation groove. The bottom of the inner cavity of the mold body is provided with a connecting groove that connects the installation groove and the groove. A driving strip is provided in the connecting groove. The driving strip is integrally set with the bottom plate and is located below the sliding strip.

[0016] The present invention is further configured such that the mold body is a square structure, and the four side walls of the inner cavity of the mold body are respectively provided with mounting grooves.

[0017] By adopting the above technical solution, when the mold is inverted and the base plate is hammered to demold, the base plate can apply force to the molded specimen. At the same time, the base plate will also drive the sliding bar to slide downward through the drive bar. The sliding bar will drive the molded specimen to move downward to complete the demolding. This further promotes the molded specimen to get out of the mold, making demolding easier and more efficient.

[0018] The present invention is further configured such that the drive bar is made of metal material.

[0019] The present invention is further configured such that both the base plate and the drive bar are made of plastic.

[0020] The present invention is further provided with reinforcing ribs on the outer side wall of the mold body.

[0021] By adopting the above technical solutions, the reinforcing ribs can enhance the overall structural strength of the mold body.

[0022] The present invention is further configured such that the distance between the edge of the groove and the edge of the inner cavity of the mold body is 0.5-1.5cm.

[0023] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0024] The HMAC high modulus asphalt concrete test specimen molding mold provided by this utility model has a detachable base plate at the bottom of the mold body. This allows the base plate to be replaced even if it is damaged. Since only the base plate needs to be replaced, the replacement cost is low.

[0025] When the base plate is made of metal, it is more resistant to impact and less likely to be damaged by knocking.

[0026] When the inverted mold strikes the base plate, the base plate moves downwards as it is struck. Simultaneously, the base plate drives the sliding bar downwards via the drive bar. The sliding bar moves the specimen downwards from the mold body on the four sides of the molded specimen, thus further promoting the demolding of the molded specimen, making demolding easier and more efficient. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the upper structure of this utility model.

[0029] Figure 2 This is a structural schematic diagram of the disassembled base plate of this utility model.

[0030] Figure 3 This is a schematic diagram of the lower structure of this utility model.

[0031] Figure 4 This is a cross-sectional view of the present invention.

[0032] Figure 5 A schematic diagram of the structure of the present invention with a drive bar.

[0033] Figure 6 An exploded view of the drive bar provided in this utility model.

[0034] Figure 7 A cross-sectional view showing the driving bar of this utility model.

[0035] The following are the labels in the attached diagram: 1. Mold body; 2. Groove; 3. Base plate; 4. Hammering hole; 5. Air hole; 6. Mounting groove; 7. Sliding strip; 8. Connecting groove; 9. Drive strip; 10. Reinforcing rib. Detailed Implementation

[0036] 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.

[0037] For reference as follows Figures 1-7 The present invention will be described as follows:

[0038] Example: A molding die for HMAC high modulus asphalt concrete test specimens includes a die body 1 with an opening on the upper side. This structure provides an open space for filling HMAC high modulus asphalt concrete mixture, which meets the operational requirements for pouring materials during test specimen preparation.

[0039] The bottom of the inner cavity of the mold body 1 is provided with a groove 2, and the edge of the groove 2 is spaced apart from the edge of the inner cavity of the mold body 1. This spacing lays the foundation for the subsequent demolding operation.

[0040] A detachable base plate 3 is fitted inside the groove 2. The fitting connection means that the base plate 3 and the groove 2 are precisely matched in size and shape, ensuring that the base plate 3 is stable in position within the mold body 1 and can effectively support the poured concrete mixture, avoiding displacement, shaking and other situations that may affect the molding quality of the test piece.

[0041] The detachable nature of the base plate 3 is a major innovation of this mold. During demolding, if a conventional hammering demolding method is used, the base plate 3 may be damaged due to external impact. However, because it is detachable, only the base plate 3 needs to be replaced after damage, without replacing the entire mold. Compared with traditional one-piece molds, the cost of replacing a single base plate 3 is significantly reduced, significantly reducing testing costs, while improving the economic efficiency and ease of maintenance of the mold.

[0042] The bottom of the groove 2 is provided with a hammering hole 4 that penetrates the lower side of the mold body 1, and the bottom plate 3 is provided with air holes 5 that penetrate the upper and lower sides of it. The air holes 5 are located in the area where the hammering hole 4 is located.

[0043] The hammer hole 4 and the air hole 5 on the bottom plate 3, which runs through its upper and lower sides and is located in the area where the hammer hole 4 is located, together constitute a dual demolding system.

[0044] The air vent 5 provides a channel for air blowing during demolding. During demolding, gas can be introduced into the mold through the air vent 5, using the gas pressure to create a pressure difference between the concrete specimen and the inner wall of the mold, attempting to separate the specimen from the mold. When air blowing demolding fails, the tapping hole 4 comes into play. Operators can tap the base plate 3 through the tapping hole 4; the external force is transmitted to the base plate 3 through the tapping hole 4, causing the base plate 3 to lift the concrete specimen from the mold body 1. These two demolding methods complement each other, allowing for flexible selection based on the actual demolding difficulty, significantly improving the success rate and efficiency of demolding.

[0045] The spacing between the edge of the groove 2 and the edge of the inner cavity of the mold body 1 ensures that the edge of the base plate 3 is also spaced from the edge of the inner cavity of the mold body 1. This design effectively prevents the edge of the base plate 3 from getting stuck on the inner wall of the mold body 1 during demolding. In traditional mold demolding processes, due to the tight fit between components, they are prone to jamming under impact or other external forces, leading to demolding difficulties or even damage to the mold and specimen. This mold, through its spacing design, ensures that the base plate 3 can move smoothly during demolding, providing structural protection for the complete and successful demolding of the concrete specimen, further improving the success rate and quality stability of specimen preparation.

[0046] The diameter of pore 5 gradually increases from top to bottom, forming an inverted conical structure.

[0047] When the air nozzle of the air blowing device is inserted into the air hole 5, the conical inner wall forms a line contact seal with the outer circumference of the air nozzle. The tapered design, which is smaller at the top and larger at the bottom, provides a self-centering guide for the air nozzle, allowing operators to quickly connect the air blowing device without precise alignment, thus improving the efficiency of demolding operations.

[0048] When using air blowing for demolding, the specific operating procedure is as follows:

[0049] 1. Insert the air nozzle of appropriate diameter into the air hole 5 until it forms a tight contact with the inner circumferential wall.

[0050] 2. Pressurized gas is injected into the air port 5 using a compressed air device (such as an air pump). The air pressure range is usually 0.2-0.5 MPa.

[0051] 3. The gas diffuses along the interface between the base plate 3 and the specimen, forming a uniform gas pressure distribution.

[0052] 4. When the gas pressure exceeds the adhesion between the specimen and the mold, the specimen begins to detach from the inner wall of the mold.

[0053] 5. If demolding is not completed after blowing air for 30 seconds, switch to the tapping demolding method.

[0054] The mold body 1 is made of plastic. It is made of high-strength engineering plastics (such as ABS, PC or nylon).

[0055] The base plate 3 is made of metal.

[0056] The high strength of the metal base plate ensures that its deformation is less than 0.1mm when subjected to impact demolding, maintaining its fitting accuracy with groove 2 even after long-term use. The plastic base plate, on the other hand, compensates for its lack of durability through a quick-replacement strategy. These two solutions complement each other, meeting the economic and reliability requirements under different testing conditions.

[0057] The inner sidewall of the mold body 1 is provided with a mounting groove 6 along the vertical direction, and a sliding strip 7 is adapted to be installed in the mounting groove 6. This ensures that the sliding strip 7 can slide smoothly in the mounting groove 6, while preventing it from shaking during the use of the mold.

[0058] The bottom of the inner cavity of the mold body 1 is provided with a connecting groove 8 that connects the mounting groove 6 and the groove 2 (connecting the mounting groove 6 and the groove 2 to provide a channel for the movement of the drive bar 9). The drive bar 9 is provided in the connecting groove 8. The drive bar 9 is integrally set with the base plate 3 (ensuring structural strength and stability). The drive bar 9 is located on the lower side of the sliding bar 7 (forming a linkage structure).

[0059] The mold body 1 has a square structure, and mounting grooves 6 are provided on the four side walls of the inner cavity of the mold body 1. This symmetrical layout ensures the uniformity of force during demolding.

[0060] When using the hammering demolding method, the operator inverts the mold and applies external force to the base plate 3 through the hammering hole 4. After being struck, the base plate 3 directly applies an upward demolding force to the molded specimen, causing the specimen to separate from the inner wall of the mold. At the same time, the drive bar 9, which is integrated with the base plate 3, moves upward within the connecting groove 8. Since the drive bar 9 is located below the sliding bar 7, it contacts the sliding bar 7 and applies a pushing force when it moves upward.

[0061] Pushed by the drive bar 9, the sliding bar 7 slides downward along the mounting groove 6. Since the side of the sliding bar 7 contacts the molded specimen, it continuously exerts a downward pushing force on the specimen as it moves downward. This pushing force, combined with the upward demolding force exerted by the base plate 3 on the specimen, forms a combined force, acting simultaneously on the molded specimen from multiple directions. This effectively overcomes the adhesion and friction between the specimen and the inner wall of the mold, promoting the rapid and complete detachment of the specimen from the mold.

[0062] This sliding demolding assist system significantly improves demolding efficiency through a mechanical linkage structure. Furthermore, the system's design makes demolding operations much less strenuous. Traditional molds require operators to apply significant, continuous striking force during demolding, while this mold, through the linkage of the sliding strip 7 and the drive strip 9, converts some of the demolding force into sliding friction, reducing the operator's workload. It is particularly suitable for demolding batches of test pieces, meeting the demands for efficient and convenient testing.

[0063] The drive bar 9 is made of metal. Alternatively, both the base plate 3 and the drive bar 9 are made of plastic.

[0064] The outer side wall of the mold body 1 is provided with reinforcing ribs 10. The reinforcing ribs 10 are firmly connected to the mold body 1 through the injection molding process, ensuring that the two form an integral load-bearing structure.

[0065] By adopting the above technical solution, the reinforcing rib 10 can enhance the overall structural strength of the mold body 1.

[0066] The distance between the edge of the groove 2 and the edge of the inner cavity of the mold body 1 is 0.5-1.5cm.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A molding die for HMAC high modulus asphalt concrete test specimens, comprising a die body with an opening on the upper side, characterized in that: The bottom of the inner cavity of the mold body is provided with a groove, the edge of the groove is spaced apart from the edge of the inner cavity of the mold body, a detachable base plate is adapted to be connected in the groove, the bottom of the groove is provided with a hammering hole penetrating the lower side of the mold body, and the base plate is provided with air holes penetrating the upper and lower sides, the air holes are located in the area where the hammering hole is located.

2. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The diameter of the pores gradually increases from top to bottom.

3. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The mold body is made of plastic.

4. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The base plate is made of metal.

5. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The inner wall of the mold body is provided with an installation groove along the vertical direction. A sliding strip is adapted to be installed in the installation groove. The bottom of the inner cavity of the mold body is provided with a connecting groove that connects the installation groove and the groove. A driving strip is provided in the connecting groove. The driving strip is integrally set with the bottom plate and is located below the sliding strip.

6. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 5, characterized in that: The mold body has a square structure, and mounting grooves are provided on the four side walls of the inner cavity of the mold body.

7. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 5, characterized in that: The drive bar is made of metal.

8. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 5, characterized in that: The base plate and drive bar are both made of plastic.

9. The molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The outer wall of the mold body is provided with reinforcing ribs.

10. A molding die for HMAC high modulus asphalt concrete test specimens according to claim 1, characterized in that: The distance between the edge of the groove and the edge of the inner cavity of the mold body is 0.5-1.5cm.

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