A general-purpose mold for preparing concrete test blocks

Abstract

This utility model relates to the field of concrete production technology and discloses a universal mold for preparing concrete test blocks. It includes a rectangular box-shaped mold body with a detachable mold base plate fitted inside. The mold body and the mold base plate form a first mold cavity with an upper opening, measuring 150mm x 150mm x 300mm. A detachable second mold core is fitted inside the first mold cavity, forming a second mold cavity with an upper opening, measuring 100mm x 100mm x 300mm. Disassembly auxiliary holes are formed on the bottom surface of the mold body. This invention aims to solve the problems of existing concrete test molds having limited functionality and easy breakage of test blocks during demolding.

Description

Technical Field

[0001] This utility model relates to the field of concrete production technology, and in particular to a universal preparation mold for concrete test blocks. Background Technology

[0002] In the field of building material performance testing, the preparation of concrete test blocks is a fundamental step in evaluating key indicators such as concrete strength. As the core tool for preparing test blocks, the rationality of the test mold's structure directly affects the quality of the test blocks and the testing efficiency.

[0003] Currently, most concrete test molds on the market suffer from limited functionality, typically only capable of preparing one type of test block. For example, 150mm×150mm×300mm and 100mm×100mm×300mm test blocks used for testing axial compressive strength require separate dedicated molds. This not only increases equipment procurement costs for construction companies but also occupies more space for on-site storage. More critically, existing molds have significant defects in the specimen demolding process. Traditional molds often employ an integral structure, requiring tools to pry or strike the edges of the mold to remove the specimen after molding. During this process, uneven stress can easily cause cracks and edge damage, severely affecting the integrity of the specimen and leading to distorted test data. While some molds incorporate simple ejection mechanisms, the ejector rods often act directly on the specimen surface, easily causing localized indentations or damage.

[0004] In addition, some existing specimen demolding processes use high-pressure gas ejection. When high-pressure gas is used to assist demolding, the gas can easily seep into the interior of the specimen, causing air holes, or the poor airtightness can lead to insufficient demolding force, which further increases the risk of specimen breakage. Utility Model Content

[0005] The purpose of this invention is to provide a universal preparation mold for concrete test blocks, which aims to solve the problems of existing concrete test molds having limited functionality and easy breakage of test blocks during demolding.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A general-purpose mold for preparing concrete test blocks includes a rectangular box-shaped mold body, a detachable mold base plate is fitted inside the mold body, and the mold body and the mold base plate form a first mold cavity with an upper opening. The dimensions of the first mold cavity are 150 mm * 150 mm * 300 mm.

[0008] A detachable second mold core is fitted inside the first mold cavity. The second mold core and the test mold body form a second mold cavity with an opening on the upper side. The dimensions of the second mold cavity are 100mm*100mm*300mm.

[0009] The bottom surface of the test mold body has disassembly auxiliary holes formed.

[0010] When preparing a 150mm*150mm*300mm specimen, the second mold core is removed from the main mold body. Then, the appropriate release agent is applied to the first mold cavity, followed by concrete filling. After tamping, the concrete surface is smoothed. Once the concrete has fully set and reached a certain strength, the specimen is removed from the first mold cavity. Inserting a corresponding push rod into the disassembly auxiliary hole provides support to the mold base plate, facilitating the ejection of the specimen from the first mold cavity. Through the blocking and transition effect of the mold base plate, the push rod does not directly contact the specimen during removal, thus protecting the specimen.

[0011] When preparing a 100mm*100mm*300mm specimen, there is no need to remove the second mold core. After applying the appropriate release agent to the second mold cavity, fill it with concrete. After tamping, smooth the surface of the concrete. After the concrete has set and reached a certain strength, remove the specimen from the second mold cavity. By inserting the appropriate push rod into the disassembly auxiliary hole, a supporting force can be provided to the mold base plate, thereby driving the mold base plate to move. The mold base plate drives the second mold core to move, thereby removing the second mold core from the specimen body. Then, the specimen is ejected from one side of the second mold core through the top plate.

[0012] Preferably, the disassembly auxiliary hole is a threaded hole. A threaded push rod can be screwed into the threaded hole. By rotating the push rod through the thread, the push rod can push the mold base plate away from the test mold body. A corresponding high-pressure gas connector can also be screwed into the threaded hole. High-pressure gas from the outside enters the lower end of the mold base plate through the gas pipe and the high-pressure gas connector. The gas pressure pushes the mold base plate outward, thus facilitating the removal of the specimen. When the specimen is ejected with high-pressure gas, the high-pressure gas acts on the mold base plate, not directly on the specimen, which provides protection and prevents the high-pressure gas from entering the concrete and affecting the quality of the concrete test block.

[0013] Preferably, the outer wall of the mold base plate is fitted with the inner wall of the test mold body with a clearance fit. A first sealing groove is formed on the outer wall of the mold base plate, and a first sealing ring is fitted inside the first sealing groove. The outer wall of the first sealing ring abuts against the inner wall of the test mold body. Through the sealing effect of the first sealing ring, firstly, it prevents concrete or water in the concrete from seeping downwards into the test mold body. Secondly, it provides better airtightness when the mold base plate is ejected by high-pressure gas, preventing the high-pressure gas from entering the area above the mold base plate, i.e., the test specimen area, thus avoiding affecting the test specimen. At the same time, the absence of high-pressure gas leakage ensures the smooth ejection of the mold base plate.

[0014] Preferably, the bottom of the mold base plate is formed with a plurality of rectangular array of countersunk holes, and adjacent countersunk holes are connected by countersunk grooves;

[0015] The disassembly auxiliary hole is configured to communicate with one of the countersunk holes.

[0016] With the above technical solution, the mold base plate is initially attached to the bottom surface of the test mold body. When the external high-pressure gas enters one of the countersunk holes through the disassembly auxiliary hole, the high-pressure gas can be transported to multiple countersunk holes through the countersunk groove. The high-pressure gas in the multiple countersunk holes provides multi-point support for the mold base plate. The mold base plate has a greater force when it is initially separated from the bottom surface of the test mold body, thereby ensuring the removal of the mold base plate.

[0017] Preferably, the second mold core includes an integrally formed middle plate, a left positioning plate, a right positioning plate, and four right-angled legs. The left and right positioning plates are positioned opposite each other on the upper part of the middle plate, and the four right-angled legs are respectively located at the four corners of the middle plate and abut against the mold base plate. The two ends of the left and right positioning plates are attached to the inner wall of the mold body. The left and right positioning plates and the inner wall of the mold body form the second mold cavity.

[0018] The outer wall of the intermediate plate is fitted with the inner wall of the mold body with a clearance fit. The second mold core is integrally formed from multiple components, which ensures the positional accuracy between the components and thus ensures more precise dimensions of the second mold core. By setting a left positioning plate and a right positioning plate, a U-shaped groove can be formed. As long as both ends of the U-shaped groove abut against the mold body, the leakage path of water when concrete is placed in the second mold cavity can be reduced. If there is only one positioning plate, three sides need to contact the mold body, which will increase the risk of leakage.

[0019] Preferably, a second sealing groove is formed on the outer wall of the intermediate plate, and a second sealing ring is fitted inside the second sealing groove, with the second sealing ring abutting against the inner wall of the mold body. The second sealing ring can further prevent the downward leakage of water in the concrete in the second mold cavity, reduce the loss of water in the concrete in the second mold cavity, and ensure the quality of the test block.

[0020] Preferably, each of the left and right positioning plates has a top flap formed at its upper end, extending to the inner wall of the mold body and flush with the upper surface of the mold body. The top flap facilitates the smoothing work after concrete tamping, and the smoothed concrete surface is flush with the end face flange; at the same time, the top flap's blocking effect prevents concrete from entering other spatial areas of the mold body.

[0021] Preferably, each of the left and right positioning plates has a side flap formed on both sides, which abuts against the inner wall of the mold body. The side flaps can extend the sealing width between the side flaps and the inner wall of the mold body, further reducing the risk of water seepage from the concrete.

[0022] The outstanding effect of this utility model is:

[0023] Compared with existing technologies, by setting a detachable second mold core, it is possible to prepare concrete test blocks of two specifications: 150mm*150mm*300mm and 100mm*100mm*300mm respectively. There is no need to equip test molds separately for test blocks of different specifications, which reduces equipment procurement costs and storage space occupation.

[0024] The disassembly auxiliary holes on the bottom surface of the mold body can be used with ejector pins or high-pressure gas connectors. The ejector pins or high-pressure gas act on the mold base plate, and the test block is ejected through the force transmitted by the mold base plate. This avoids direct contact between the ejector pins and the test block, reduces the risk of damage to the test block during demolding, ensures the integrity of the test block, and ensures the accuracy of the test data.

[0025] The first sealing ring on the bottom plate and the second sealing ring on the middle plate effectively prevent concrete and its moisture from seeping downwards, ensuring the stability of the water-cement ratio of the test block and facilitating the normal development of the test block's strength.

[0026] The second mold core adopts an integrated molding structure, which ensures the positional and dimensional accuracy between the components; the U-shaped groove formed by the left and right positioning plates and the side flaps reduce the leakage path and external seepage risk of concrete moisture; the countersunk hole and countersunk groove design at the bottom of the mold base plate allows high-pressure gas to provide multi-point support for the mold base plate, ensuring the smooth removal of the mold base plate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a cross-sectional view of the present invention;

[0029] Figure 3 This is a schematic diagram of the mold base plate of this utility model;

[0030] Figure 4 This is an exploded view of the present invention.

[0031] Reference numerals: 1. Trial mold body; 11. Disassembly auxiliary hole; 2. Mold base plate; 21. First sealing groove; 22. First sealing ring; 23. Countersunk hole; 24. Countersunk groove; 3. Second mold core; 31. Intermediate plate; 32. Left positioning plate; 33. Right positioning plate; 34. Right-angle support foot; 35. Second sealing groove; 36. Second sealing ring; 37. Top flap; 38. Side flap; 100. First mold cavity; 101. Second mold cavity. Detailed Implementation

[0032] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0033] The following is for reference Figures 1 to 4 The present invention will be described as follows:

[0034] A general-purpose mold for preparing concrete test blocks, such as Figure 1 , Figure 2 As shown, the mold includes a rectangular box-shaped test mold body 1, inside which a detachable mold base plate 2 is fitted. The test mold body 1 and the mold base plate 2 form a first mold cavity 100 with an upper opening. The dimensions of the first mold cavity 100 are 150 mm * 150 mm * 300 mm. A detachable second mold core 3 is fitted inside the first mold cavity 100. The second mold core 3 and the test mold body 1 form a second mold cavity 101 with an upper opening. The dimensions of the second mold cavity 101 are 100 mm * 100 mm * 300 mm. A disassembly auxiliary hole 11 is formed on the bottom surface of the test mold body 1. The disassembly auxiliary hole 11 is a threaded hole.

[0035] like Figures 2-4 As shown, the outer wall of the mold base plate 2 is fitted with the inner wall of the test mold body 1 with a clearance. A first sealing groove 21 is formed on the outer wall of the mold base plate 2, and a first sealing ring 22 is fitted inside the first sealing groove 21. The outer wall of the first sealing ring 22 is attached to the inner wall of the test mold body 1. The bottom of the mold base plate 2 is formed with a plurality of rectangular array countersunk holes 23, and adjacent countersunk holes 23 are connected by countersunk grooves 24. The disassembly auxiliary hole 11 is connected to one of the countersunk holes 23.

[0036] The second mold core 3 includes an integrally formed intermediate plate 31, a left positioning plate 32, a right positioning plate 33, and four right-angled support legs 34. The left positioning plate 32 and the right positioning plate 33 are positioned opposite each other on the upper part of the intermediate plate 31, and the four right-angled support legs 34 are respectively located at the four corners of the intermediate plate 31 and abut against the mold base plate 2. The two ends of the left positioning plate 32 and the right positioning plate 33 are attached to the inner wall of the test mold body 1. The left positioning plate 32, the right positioning plate 33, and the inner wall of the test mold body 1 form the second mold cavity 101. The outer wall of the intermediate plate 31 is fitted with the inner wall of the test mold body 1 with a clearance fit.

[0037] A second sealing groove 35 is formed on the outer wall of the intermediate plate 31, and a second sealing ring 36 is fitted inside the second sealing groove 35. The second sealing ring 36 abuts against the inner wall of the mold body 1. A top surface flap 37 is formed at the upper end of each of the left positioning plate 32 and the right positioning plate 33. The top surface flap 37 extends to the inner wall of the mold body 1 and is flush with the upper end surface of the mold body 1. A side flap 38 is formed on both sides of the left positioning plate 32 and the right positioning plate 33. The side flap 38 abuts against the inner wall of the mold body 1.

[0038] Prepare concrete test blocks measuring 150 mm * 150 mm * 300 mm.

[0039] Mold preparation: First, ensure the inside of the mold body 1 is clean and free of debris. Remove the second mold core 3 from the mold body 1, leaving only the mold base plate 2 inside. Inspect the first sealing groove 21 on the mold base plate 2 to ensure the first sealing ring 22 is intact and properly installed, with the outer wall of the first sealing ring 22 tightly against the inner wall of the mold body 1 to ensure good sealing performance.

[0040] Apply release agent: Apply release agent evenly to the inner wall of the first mold cavity 100 formed by the mold body 1 and the mold base plate 2, ensuring that the release agent covers all surfaces in contact with the concrete, in order to prepare for subsequent demolding.

[0041] Filling the concrete: Pour the well-mixed concrete into the first mold cavity 100, and use a vibrator to tamp the concrete to remove air bubbles and ensure its compactness. During tamping, be careful to avoid the vibrator touching the inner wall of the mold cavity to prevent damage to the mold or affecting the quality of the test blocks.

[0042] Smoothing treatment: After the concrete is filled to be flush with the upper surface of the test mold body 1, use a trowel to smooth the upper surface of the concrete to make the surface of the test block flat and smooth.

[0043] Curing wait: Place the mold containing concrete in a suitable curing environment and wait for the concrete to set and reach a certain strength.

[0044] Demolding Operation: Demolding is performed after the concrete strength reaches the required level. The ejector rod is screwed into the disassembly auxiliary hole 11 on the bottom surface of the mold body 1. By rotating the ejector rod, it applies an upward supporting force to the mold base plate 2, causing the mold base plate 2 to move the test block upwards, thus ejecting the test block from the first mold cavity 100. During this process, since the ejector rod does not directly contact the test block, the integrity of the test block is effectively protected. Alternatively, a high-pressure gas connector can be connected to the disassembly auxiliary hole. External high-pressure gas enters the lower end of the mold base plate 2 through the gas pipe and high-pressure gas connector, using air pressure to push the mold base plate 2 outwards, facilitating the removal of the test specimen. When ejecting the test specimen with high-pressure gas, the high-pressure gas acts on the mold base plate 2, not directly on the test specimen, providing protection and preventing high-pressure gas from entering the concrete and affecting the quality of the concrete test block.

[0045] Prepare concrete test blocks measuring 100 mm * 100 mm * 300 mm.

[0046] Mold Preparation: Keep the inside of the test mold body 1 clean. Fit the second mold core 3 into the first mold cavity 100, ensuring that the four right-angled legs 34 of the second mold core 3 are stably abutted against the mold base plate 2, and that the ends of the left positioning plate 32 and the right positioning plate 33 are against the inner wall of the test mold body 1. Check the second sealing groove 35 on the intermediate plate 31 to ensure that the second sealing ring 36 is intact and abuts against the inner wall of the test mold body 1, enhancing the sealing effect. At the same time, check the top flaps 37 at the upper ends of the left positioning plate 32 and the right positioning plate 33 to ensure that they extend to the inner wall of the test mold body 1 and are flush with the upper end surface of the test mold body 1, and that the side flaps 38 on both sides are against the inner wall of the test mold body 1.

[0047] Apply release agent: Apply release agent evenly to the inner wall of the second mold cavity 101 formed by the second mold core 3 and the test mold body 1.

[0048] Filling concrete: Pour the mixed concrete into the second mold cavity 101 and tamp it to remove air bubbles and ensure that the concrete is dense.

[0049] Smoothing treatment: After the concrete is filled to be flush with the top flap 37, use a trowel to smooth the upper surface of the concrete so that the concrete surface is flush with the top flap 37.

[0050] Curing and waiting: Place the mold in a suitable curing environment and wait for the concrete to set and reach a certain strength.

[0051] Demolding operation: After the concrete strength reaches the standard, first insert the top rod through the disassembly auxiliary hole 11, rotate the top rod to apply an upward force to the mold base plate 2, the mold base plate 2 drives the second mold core 3 to move upward together, and remove the second mold core 3 from the test mold body 1. Then, use the top plate on one side of the second mold core 3 to push the test block out from the second mold cavity 101.

[0052] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A universal mold for preparing concrete test blocks, comprising a rectangular box-shaped mold body (1), characterized in that: The test mold body (1) is fitted with a detachable mold base plate (2), and the test mold body (1) and the mold base plate (2) form a first mold cavity (100) with an upper opening. A detachable second mold core (3) is fitted inside the first mold cavity (100), and the second mold core (3) and the test mold body (1) form a second mold cavity (101) with an upper opening. The bottom surface of the test mold body (1) is formed with disassembly auxiliary holes (11).

2. A universal mold for preparing concrete test blocks according to claim 1, characterized in that: The disassembly auxiliary hole (11) is a threaded hole.

3. A universal mold for making concrete test blocks according to claim 1, wherein: The outer wall of the mold base plate (2) is fitted with the inner wall of the test mold body (1) with a gap. A first sealing groove (21) is formed on the outer wall of the mold base plate (2). A first sealing ring (22) is sleeved in the first sealing groove (21). The outer wall of the first sealing ring (22) is attached to the inner wall of the test mold body (1).

4. A universal mold for making concrete test blocks according to claim 1, wherein: The bottom of the mold base plate (2) is formed with a plurality of rectangular array of countersunk holes (23), and adjacent countersunk holes (23) are connected by countersunk grooves (24); The disassembly auxiliary hole (11) is connected to one of the countersunk holes (23).

5. A universal mold for making concrete test blocks according to claim 1, wherein: The second mold core (3) includes an integrally formed middle plate (31), a left positioning plate (32), a right positioning plate (33), and four right-angled legs (34). The left positioning plate (32) and the right positioning plate (33) are positioned opposite each other on the upper part of the middle plate (31), and the four right-angled legs (34) are respectively set at the four corners of the middle plate (31) and abut against the mold base plate (2). The two ends of the left positioning plate (32) and the right positioning plate (33) are attached to the inner wall of the test mold body (1). The left positioning plate (32), the right positioning plate (33), and the inner wall of the test mold body (1) form the second mold cavity (101). The outer wall of the intermediate plate (31) is fitted with the inner wall of the test mold body (1) with a gap.

6. A universal mold for making concrete test blocks according to claim 5, wherein: The outer wall of the intermediate plate (31) is formed with a second sealing groove (35), and a second sealing ring (36) is sleeved inside the second sealing groove (35). The second sealing ring (36) is attached to the inner wall of the test mold body (1).

7. A universal mold for making concrete test specimens as defined in claim 5, wherein: The upper ends of the left positioning plate (32) and the right positioning plate (33) are each formed with a top surface flap (37), which extends to the inner wall of the mold body (1) and is flush with the upper surface of the mold body (1).

8. A universal mold for making concrete test blocks according to claim 5, wherein: The left positioning plate (32) and the right positioning plate (33) each have a side flap (38) formed on both sides, and the side flap (38) is attached to the inner wall of the test mold body (1).

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