Special forming die for semi-cylindrical pouring type composite pavement test piece

Abstract

The utility model discloses a special forming die for a semi-cylindrical pouring type composite pavement test piece. In the process of evaluating the performance of the pouring type composite pavement material, a one-time forming mold which can be correspondingly matched with the shape of a test piece is lacked. The device comprises a driving circular truncated cone, a fixed vertical plate, an arc-shaped piece and an arc-shaped supporting piece, the fixed vertical plate is vertically arranged on the top face of the driving circular truncated cone, the bottom side of the fixed vertical plate is fixedly connected with the driving circular truncated cone, the arc-shaped piece is an elastic piece and is vertically arranged on the top face of the driving circular truncated cone, and the two ends of the arc-shaped piece are detachably connected with the fixed vertical plate respectively. A semicircular slurry injection cavity is defined between the inner side wall of the fixing vertical plate and the inner wall of the arc-shaped piece, an arc-shaped supporting piece is arranged on the outer wall of the arc-shaped piece in a matched mode, the side, facing the arc-shaped piece, of the arc-shaped supporting piece is a limiting side, and the bottom of the arc-shaped supporting piece is in sliding fit with the driving circular truncated cone.

Description

Technical Field

[0001] The utility model specifically relates to a special forming die for a semi-cylindrical pouring type composite road test piece, belonging to the technical field of road engineering test tools. Background Art

[0002] The inherent disadvantages of traditional asphalt and cement pavements have severely hampered the development of road transportation in my country. Poured composite concrete pavements, a novel pavement type developed by injecting a specially graded cement mortar into the interstices of a large, open-graded asphalt mixture, are based on the principle of transforming flexibility into rigidity. Advantages of poured composite concrete pavements include: excellent high-temperature deformation resistance and oil corrosion resistance; strong surface wear resistance; improved driving comfort due to the lack of expansion and contraction cracks; and colorability and fire resistance, among other properties. However, due to the relatively recent development of research on poured composite pavement materials, these pavements still face numerous challenges in their practical application. Asphalt and cement grouting materials are crucial components of poured composite pavements, playing a crucial role in their high-temperature stability, low-temperature crack resistance, and other road performance characteristics. Currently, research on the performance evaluation indicators of asphalt and cement grouting materials in poured composite pavements is insufficient, with limited research methods and time-consuming and labor-intensive research. Therefore, research on the performance evaluation indicators of asphalt and cement mortar materials in poured composite pavements is of great significance.

[0003] At present, there is a certain foundation for the research on the performance evaluation indicators of asphalt materials and cement grouting materials in poured composite roads. However, the above research is based on a large number of indoor tests and engineering practices. This research method not only consumes a lot of manpower and material resources, but also is affected by many factors such as human factors and environmental factors, resulting in inaccurate test results. At present, in the test process, it is necessary to put the heated aggregates, asphalt, and mineral powder into the asphalt mixture mixing pot according to the composition and volume parameters of the designed base asphalt mixture, and then compact them to form cylindrical specimens. Finally, the cylindrical specimens that have been cured need to be cut at the corresponding positions that meet the test requirements. The amount of waste generated after cutting is large, which is close to half the weight of the finished specimen. There is currently a lack of one-time forming molds that can match the shape of the specimens. Summary of the Invention

[0004] In order to overcome the defects of the prior art, a special forming mold for a semi-cylindrical poured-in composite road test piece is provided to solve the above problems.

[0005] A special forming mold for a semi-cylindrical poured-type composite road test piece includes a driving table, a fixed vertical plate, an arc-shaped piece and an arc-shaped support piece. A fixed vertical plate is vertically arranged on the top surface of the driving table, and the bottom side of the fixed vertical plate is fixedly connected to the driving table. The arc-shaped piece is an elastic piece, which is vertically arranged on the top surface of the driving table. The two ends of the arc-shaped piece are respectively detachably connected to the fixed vertical plate. A semicircular slurry injection cavity is formed between the inner side wall of the fixed vertical plate and the inner wall of the arc-shaped piece. An arc-shaped support piece is cooperated with on the outer wall of the arc-shaped piece. The side of the arc-shaped support piece facing the arc-shaped piece is the limiting side, and the bottom of the arc-shaped support piece is slidably matched with the driving table.

[0006] The beneficial effects of the present invention are:

[0007] The present invention achieves the one-time molding of semi-cylindrical test pieces through the interaction between the driving table, the fixed vertical plate, the arc-shaped piece, and the arc-shaped support member, eliminating the need for secondary cutting, avoiding the generation of a large amount of excess material, and saving testing costs and resources. Through the interaction between the fixed vertical plate and the arc-shaped piece in a dynamic and static arrangement, semi-cylindrical shapes of varying diameters can be formed according to test requirements. Through the interaction between the fixed vertical plate and the arc-shaped support member, the ends and the middle outer wall of the arc-shaped piece can be positioned and supported at three points, facilitating the formation of a regular shape for the semi-cylindrical test piece.

[0008] 2. The semicircular slurry injection cavity formed between the inner wall of the fixed vertical plate and the inner wall of the arc-shaped piece is a cavity with an open top, which is conducive to external contact with the semi-cylindrical specimen for pressure application, thereby facilitating more sufficient grouting. The enclosed connection between the inner wall of the fixed vertical plate and the arc-shaped piece is easy to disassemble, which facilitates subsequent smooth demoulding and maintenance, and subsequent analysis and research. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention, in which the arc-shaped support member is removed;

[0010] Figure 2 This is a schematic diagram of the top structure of the utility model;

[0011] Figure 3 This is a schematic diagram of the structure of the utility model in a top view when in use;

[0012] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0013] Figure 5 Schematic diagram of the three-dimensional structure of the arc support plate;

[0014] Figure 6 This is a schematic diagram of the main structure of the arc-shaped support member;

[0015] Figure 7It is a side structural schematic diagram of the hoop;

[0016] Figure 8 Schematic diagram of the three-dimensional structure of the driving frustum;

[0017] Figure 9 It is a schematic diagram of the first main structure of the fixed vertical plate;

[0018] Figure 10 A second main structural diagram of a fixed vertical plate;

[0019] Figure 11 This is a schematic diagram of the third main structure of the fixed vertical plate.

[0020] In the figure: 1-driving table; 1-1-strip groove; 1-2-support frame; 1-3-motor; 1-4-transmission assembly; 2-fixed vertical plate; 3-arc-shaped plate; 3-1-outer ridge; 3-2-inner ridge; 4-arc-shaped support member; 4-1-arc-shaped support plate; 4-2-base; 4-3-sliding plate; 5-semicircular slurry injection cavity; 6-limiting side; 7-plug-in portion; 7-1-socket; 8-bidirectional raised portion; 9-recessed portion; 10-hoop; 11-first flexible diaphragm; 12-second flexible diaphragm; 13-through-screw; 14-semi-cylindrical specimen. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention.

[0022] Specific implementation method 1: Combination Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11Explanation of this embodiment. In this embodiment, the special forming mold is a special mold for forming a semi-cylindrical specimen. The mold includes a driving table 1, a fixed vertical plate 2, an arc piece 3 and an arc support 4. The driving table 1 is a disc body, and a driving component is provided at the bottom thereof. The driving component is an existing component. The driving component cooperates with the driving table 1 to make a vibration or rotation action, providing a driving force for the related actions of the driving table 1. A fixed vertical plate 2 is vertically provided on the top surface of the driving table 1. The fixed vertical plate 2 is a hard half body, which can be specifically a plastic template or an alloy steel plate. The bottom side of the fixed vertical plate 2 is fixedly connected to the driving table 1, and the fixed vertical plate 2 provides a stable support for the arc piece 3. The arc piece 3 is an elastic sheet, which can be specifically a plastic sheet body. The arc The piece 3 is vertically arranged on the top surface of the driving table 1. The two ends of the arc-shaped piece 3 are detachably connected to the fixed vertical plate 2, which is convenient for the enclosure connection with the fixed vertical plate 2 and the subsequent demolding operation. A semicircular slurry injection cavity 5 is formed between the inner side wall of the fixed vertical plate 2 and the inner wall of the arc-shaped piece 3. The transverse cross-sectional shape of the semicircular slurry injection cavity 5 is semicircular. The height of the semicircular slurry injection cavity 5 is matched with the height of the arc-shaped piece 3. The height of the arc-shaped piece 3 is about 60mm, and the length of the fixed vertical plate 2 is 160-180mm. An arc-shaped support member 4 is provided on the outer wall of the arc-shaped piece 3. The side of the arc-shaped support member 4 facing the arc-shaped piece 3 is a limiting side 6. The bottom of the arc-shaped support member 4 is slidably matched with the driving table 1. The arc-shaped support member 4 is used to play a corresponding pushing and limiting role when the arc-shaped piece 3 forms semicircular slurry injection cavities 5 of different diameters, thereby avoiding deformation of the bottom of the semicircular slurry injection cavity 5.

[0023] The semi-cylindrical test piece 14 formed by the present invention is a base asphalt mixture test piece. This not only helps save material in test piece molding, but also forms a top-open structure, which facilitates the placement of weights on the top for compaction. It also facilitates cement grouting, and allows for continuous shaking and the use of tools such as scrapers to apply pressure during the grouting process to ensure more complete grouting. After grouting is completed, the remaining grout on the surface is wiped off, and the semi-cylindrical test piece 14 needs to be placed in a standard curing room for 3 days before being removed.

[0024] The present invention can form a semi-cylindrical test piece 14 with a radius of 60-80 mm and a thickness of 40-60 mm. The specific diameter and thickness can be determined according to specific test requirements.

[0025] Specific embodiment 2: This embodiment is a further limitation of specific embodiment 1. The driving table 1 can be an existing table adjustment structure or a rotating table structure. The driving table 1 is equipped with different driving components. The driving components may include a support frame 1-2, a motor 1-3 and a transmission assembly 1-4. The support frame 1-2 is arranged below the driving table 1. The top of the transmission assembly 1-4 is connected to the bottom of the driving table 1. The driving table 1 is connected to the output shaft of the motor 1-3 through the transmission assembly 1-4. The support frame 1-2, the motor 1-3 and the transmission assembly 1-4 cooperate with each other to drive the driving table 1 to make a bouncing or rotating motion. The motion process is an existing electronic control process.

[0026] Furthermore, motors 1-3 are copper core motors, which are safe and durable.

[0027] Furthermore, the driving table 1 is also provided with a digital display controller for controlling the opening and closing of the related movements of the driving table 1.

[0028] Furthermore, a strip groove 1-1 is processed on the top surface of the driving truncated table 1 to standardize the installation position of the fixed vertical plate 2. The length of the strip groove 1-1 is smaller than the outer diameter of the driving truncated table 1 and larger than the radius of the driving truncated table 1.

[0029] Specific embodiment three: This embodiment is a further limitation of specific embodiment one or two. The height of the arc-shaped piece 3 is lower than the height of the fixed vertical plate 2. A plug-in portion 7 is processed at each end of the fixed vertical plate 2. Each plug-in portion 7 includes a plurality of sockets 7-1. The plurality of sockets 7-1 are vertically arranged in parallel. The height of each socket 7-1 is less than the height of the fixed vertical plate 2. The lower end of each socket 7-1 is an open end, and the open end is flush with the top surface of the driving table 1. Such an arrangement can ensure that the bottom of the fixed vertical plate 2 and the arc-shaped piece 3 are flush, so that the shape of the semi-cylindrical specimen 14 formed is more regular.

[0030] Specific embodiment four: This embodiment is a further limitation of specific embodiments one, two or three. The arc-shaped sheet 3 is a plastic sheet. A plurality of outer ridges 3-1 are respectively processed on the outer walls at both ends of the arc-shaped sheet 3, and a plurality of inner ridges 3-2 are respectively processed on the inner walls at both ends of the arc-shaped sheet 3. The outer ridges 3-1 and the inner ridges 3-2 are arranged in a one-to-one correspondence. A bidirectional protrusion 8 that cooperates with the socket 7-1 is formed between each outer ridge 3-1 and its corresponding inner ridge 3-2, and a recessed portion 9 is formed between two adjacent bidirectional protrusions 8.

[0031] Furthermore, the minimum distance between the two plug-in portions 7 is 120 mm and the maximum distance is 160 mm, thereby adapting to different size requirements and covering the size requirement range in the material property evaluation test of the poured composite pavement.

[0032] Furthermore, the outer ridge 3-1 and the inner ridge 3-2 can be made of elastic rubber, which is beneficial for the outer ridge 3-1 and the inner ridge 3-2 in the socket 7-1 to be squeezed and deformed by themselves to facilitate the stable positioning of the end of the arc piece 3 in the fixed vertical plate 2.

[0033] Furthermore, each outer ridge 3 - 1 and its corresponding inner ridge 3 - 2 are on the same straight line.

[0034] Specific embodiment five: This embodiment is a further limitation of specific embodiments one, two, three or four. Each end of the arc-shaped piece 3 is equipped with a hoop 10. The hoop 10 is an elastic sleeve for fixing the end position of the arc-shaped piece 3 to achieve a stable connection with the fixed vertical plate 2. Each hoop 10 is sleeved in a recessed portion 9 on the arc-shaped piece 3, and the inner side wall of each hoop 10 is arranged close to the outer side wall of the fixed vertical plate 2.

[0035] Specific embodiment six: This embodiment is a further limitation of specific embodiments one, two, three, four or five, and the arc support member 4 includes an arc support plate 4-1, a base 4-2 and a sliding plate 4-3. The arc support plate 4-1 is vertically arranged, and the inner side of the arc support plate 4-1 is the limiting side 6 that cooperates with the arc piece 3. The bottom of the arc support plate 4-1 is connected to the top surface of the sliding plate 4-3 through the base 4-2, and the sliding plate 4-3 is slidably matched with the top surface of the driving table 1. The sliding direction of the arc support plate 4-1 is the same as the radial direction of the semicircular slurry injection cavity 5.

[0036] Furthermore, a sliding groove is processed on the driving table 1 to match the sliding plate 4-3. The sliding plate 4-3 is set in the sliding groove. The two sides of the sliding plate 4-3 slide and match with the inner walls of the two sides of the sliding groove. The base 4-2 can be a ball joint seat body, which is conducive to the fine-tuning and swinging of the arc support plate 4-1.

[0037] Furthermore, another structural form of the base 4-2 is an inverted T-shaped seat body, the vertical part of the inverted T-shaped seat body is passed through the bottom of the arc-shaped support plate 4-1, and the horizontal part of the T-shaped seat body is used for bottom support. The corresponding arc-shaped support plate 4-1 can be a plate body made of flexible or elastic material, which can not only position and support the arc-shaped piece 3 under the support of the T-shaped seat body, but also use the flexible and elastic properties of the arc-shaped support plate 4-1 to improve the effect of sticking to the outer wall of the arc-shaped piece 3, thereby improving the adaptability of positioning and sticking.

[0038] Specific embodiment seven: This embodiment further defines specific embodiment six. Sliding plate 4-3 has through-holes machined along its thickness. Through-holes are fitted with through-holes 13. Sliding plate 4-3 is detachably connected to driving table 1 via through-holes 13. When the arcuate support plate 4-1, driven by sliding plate 4-3, slides to a radial position corresponding to the test dimensions, through-holes are fitted with through-holes 13 to secure the arcuate support plate 4-1 in place.

[0039] Specific embodiment eight: This embodiment further defines specific embodiments one, two, three, four, five, six, or seven. A first flexible membrane 11 is provided on the inner wall of the fixed riser 2, and a second flexible membrane 12 is provided on the inner wall of the curved sheet 3. The first flexible membrane 11 and the second flexible membrane 12 are made of existing plastic film materials and are used to enclose the inner wall of the semicircular slurry injection cavity 5. This helps to regularize the shape of the subsequently formed semi-cylindrical test piece 14, facilitates demolding, protects the fixed riser 2 and the curved sheet 3, and facilitates repeated use.

[0040] Combine Figures 1 to 11 A working principle of the utility model is described:

[0041] According to the dimensional requirements of the experimental design, the two ends of the arc piece 3 are respectively inserted into the two ends of the fixed vertical plate 2 on the driving trunnion 1. The corresponding socket 7-1 is selected to ensure that the distance between the two ends of the arc piece 3 is 150mm. The arc support member 4 is moved until it is close to the middle outer wall of the arc piece 3. According to the composition and volume parameters of the base asphalt mixture of the experimental design, the heated aggregates, asphalt, and mineral powder are respectively added to the asphalt mixture mixing pot for mixing. Each mixing time is 90 seconds. After mixing, the mixture is poured into the semicircular slurry injection cavity 5. The height of the mixture is poured into the semicircular slurry injection cavity 5. The mixture is compacted in the semicircular slurry injection cavity 5, and finally a semi-cylindrical test piece 14 with a diameter of 150mm and a height of 120mm is formed.

[0042] The semi-cylindrical specimens 14 are then grouted with cement slurry. During the grouting process, they are shaken continuously and pressure is applied using a scraper or other tool to ensure full grouting. After grouting, the remaining slurry on the surface is wiped off, labeled, and placed in a standard curing room for 7 days before being removed for use.

[0043] Combine Figures 1 to 11 Explain the working principle of the variable diameter of the utility model:

[0044] When the diameter of the semi-cylindrical specimen 14 to be formed increases, the arc support member 4 is moved outward, and the length of the arc piece 3 is lengthened. According to the size requirements of the experimental design, the two ends of the arc piece 3 are respectively inserted into the two ends of the fixed vertical plate 2 on the driving table 1. The corresponding sockets 7-1 are selected to ensure that the distance between the two ends of the arc piece 3 meets the diameter requirements. The arc support member 4 is moved again until it is close to the middle outer wall of the arc piece 3. According to the composition and volume parameters of the base asphalt mixture of the experimental design, the heated aggregates, asphalt, and mineral powder are respectively added to the asphalt mixture mixing pot for mixing. After mixing, the mixture is poured into the semi-circular slurry injection cavity 5 and the mixture in the semi-circular slurry injection cavity 5 is compacted to finally form a semi-cylindrical specimen 14 that meets the size requirements. When the diameter needs to be shortened, the operation process is the reverse of the above process.

Claims

1. A special forming mold for semi-cylindrical poured composite road test pieces. Features: The invention comprises a driving truncated table (1), a fixed vertical plate (2), an arc-shaped sheet (3) and an arc-shaped support member (4); the fixed vertical plate (2) is vertically arranged on the top surface of the driving truncated table (1); the bottom side of the fixed vertical plate (2) is fixedly connected to the driving truncated table (1); the arc-shaped sheet (3) is an elastic sheet; the arc-shaped sheet (3) is vertically arranged on the top surface of the driving truncated table (1); the two ends of the arc-shaped sheet (3) are respectively detachably connected to the fixed vertical plate (2); a semicircular slurry injection cavity (5) is formed between the inner side wall of the fixed vertical plate (2) and the inner wall of the arc-shaped sheet (3); the arc-shaped support member (4) is matched with the outer wall of the arc-shaped sheet (3); the side of the arc-shaped support member (4) facing the arc-shaped sheet (3) is a limiting side (6); the bottom of the arc-shaped support member (4) is slidably matched with the driving truncated table (1).

2. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 1, Features: The height of the arc-shaped piece (3) is lower than the height of the fixed vertical plate (2), and a plug-in portion (7) is processed at both ends of the fixed vertical plate (2), each plug-in portion (7) comprises a plurality of sockets (7-1), and the plurality of sockets (7-1) are arranged vertically in parallel, and the height of each socket (7-1) is lower than the height of the fixed vertical plate (2), and the lower end of each socket (7-1) is an open end, and the open end is arranged flush with the top surface of the driving truncated table (1).

3. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 2, Features: The arc-shaped sheet (3) is a plastic sheet. A plurality of outer ridges (3-1) are processed on the outer walls at both ends of the arc-shaped sheet (3). A plurality of inner ridges (3-2) are processed on the inner walls at both ends of the arc-shaped sheet (3). The outer ridges (3-1) and the inner ridges (3-2) are arranged in one-to-one correspondence. A bidirectional convex portion (8) that matches the socket (7-1) is formed between each outer ridge (3-1) and its corresponding inner ridge (3-2). A concave portion (9) is formed between two adjacent bidirectional convex portions (8).

4. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 3, Features: Each end of the arc-shaped sheet (3) is matched with a hoop (10), each hoop (10) is sleeved in a recess (9) on the arc-shaped sheet (3), and the inner side wall of each hoop (10) is closely fixed to the outer side wall of the vertical plate (2).

5. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 1, Features: The arc-shaped support member (4) comprises an arc-shaped support plate (4-1), a base (4-2) and a sliding plate (4-3); the arc-shaped support plate (4-1) is arranged vertically; the inner side of the arc-shaped support plate (4-1) is the limiting side (6) that cooperates with the arc-shaped sheet (3); the bottom of the arc-shaped support plate (4-1) is connected to the top surface of the sliding plate (4-3) through the base (4-2); the sliding plate (4-3) is slidably matched with the top surface of the driving truncated table (1); and the sliding direction of the arc-shaped support plate (4-1) is in the same direction as the radial direction of the semicircular slurry injection cavity (5).

6. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 5, Features: The sliding plate (4-3) is processed with a through hole along its thickness direction, and a through screw (13) is provided on the through hole. The sliding plate (4-3) is detachably connected to the driving round table (1) via the through screw (13).

7. A special forming mold for a semi-cylindrical poured composite road test piece according to claim 1, Features: A first flexible diaphragm (11) is arranged on the inner wall of the fixed vertical plate (2), and a second flexible diaphragm (12) is arranged on the inner wall of the arc-shaped plate (3).

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