Mold for prefabricating concrete test piece with cracks

Abstract

The utility model discloses a mould for prefabricating a concrete test piece with cracks, which relates to the field of prefabrication of concrete test pieces, and comprises a mould box for accommodating concrete, and the mould box consists of a plurality of side plates and a bottom plate; a plurality of through holes are formed in at least two side plates, and the axes of the through holes are perpendicular to the plate surfaces of the side plates; screws penetrate through part of or all of the through holes, the screws located outside the mold box are connected with nuts, and the ends, close to the interior of the mold box, of the screws are fixedly connected with steel sheets. And the other through holes are blocked by the blocking pieces. The crack forming angle can be adjusted, meanwhile, a mold (such as a cutter and a steel sheet) for forming cracks is easy to lock, the cracks can be formed on multiple faces, and disassembly is easy.

Description

Technical Field

[0001] The utility model relates to the field of concrete test block prefabrication, in particular to a mold for prefabricating concrete test pieces with cracks. Background Art

[0002] When creating prefabricated cracks in concrete test blocks, it's difficult for testers to accurately control the crack location and size. To address this issue, Chinese patent publication number "CN208005931 U" discloses a "Prefabricated Concrete Test Block Crack Mold." This mold adjusts the angle and penetration of a blade within the mold to precisely control the crack size and angle. Other current solutions are similar to the one disclosed in this patent.

[0003] As can be seen, this solution requires a fixture to lock the blade, and the fixture includes a backing plate, multiple bolts, and other components, making the structure of the tool fixing relatively complex. Furthermore, only one side can form a crack, making disassembly difficult. Therefore, similar solutions need further optimization. Utility Model Content

[0004] The purpose of the present utility model is to provide a mold for prefabricated concrete specimens with cracks in order to solve the above-mentioned problems. The mold can adjust the angle of crack formation, and the mold (such as a tool, a steel sheet, etc.) for forming the cracks is easy to lock, and cracks can be formed on multiple surfaces and can be easily disassembled.

[0005] The technical solution adopted by the utility model is as follows: a mold for prefabricated concrete specimens with cracks, including a mold box for accommodating concrete, the mold box consisting of multiple side panels and a bottom plate; multiple through holes are opened on at least two side panels, and the axes of the through holes are perpendicular to the plate surfaces of the side panels; some or all of the through holes are passed through by screws, the screws located outside the mold box are connected to nuts, and the ends of the screws near the mold box are fixedly connected to steel sheets; the remaining through holes are blocked by blocking members.

[0006] Furthermore, the steel sheet has a connecting portion, which is connected to the screw rod. The connecting portion is cylindrical, and the diameter of the connecting portion is equal to the diameter of the through hole.

[0007] Furthermore, the connecting portion is detachably connected to the screw rod.

[0008] Furthermore, the connecting part has a countersunk hole for inserting the screw, and a plurality of pin holes are provided at the countersunk hole and at the position on the screw for inserting the countersunk hole. The pin holes on the connecting part match the positions of the pin holes on the screw, and the axes of the pin holes are perpendicular to the axes of the connecting part and the screw, and there are bolts passing through the pin holes to connect the connecting part and the screw.

[0009] Furthermore, the blocking member consists of an insertion portion and a limiting portion, the insertion portion is used to be inserted into the through hole, the axial length of the insertion portion matches the axial size of the through hole, the limiting portion is fixed at one end of the insertion portion, and the geometric size of the limiting portion is larger than the diameter of the through hole.

[0010] Furthermore, an elastic gasket is sleeved on the screw; after the mold is assembled, the elastic gasket is located between the nut and the mold box.

[0011] Furthermore, the bottom plate and the side plates, and adjacent side plates are detachably connected.

[0012] Furthermore, the bottom plate and the side plates, as well as adjacent side plates, are connected by screws.

[0013] Furthermore, a cover plate is included, and the cover plate is used to close the top of the mold box.

[0014] Furthermore, sealing strips are provided between the bottom plate and the side plates, and between adjacent side plates.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. The utility model locks the angle of the steel sheet through structures such as nuts and screws, effectively ensuring the stability of the angle position of the steel sheet, that is, achieving the adjustment of the crack formation angle;

[0017] 2. The utility model is provided with multiple through holes on multiple side panels, which can prepare cracks of different numbers and positions on different surfaces of the concrete specimen. The angle of each steel sheet can be adjusted independently, increasing the applicability of the concrete specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a schematic cross-sectional view of the utility model;

[0020] Figure 2 This is a schematic diagram of the installation of the sealing ring disclosed in the utility model;

[0021] Figure 3 This is a schematic diagram of the front appearance of the utility model;

[0022] Figure 4 This is a schematic diagram of the screw distribution on the bottom plate disclosed in the utility model;

[0023] Markings in the figure: 1-side plate; 11-through hole; 2-steel sheet; 21-connecting part; 3-screw; 31-nut; 4-blocking piece; 41-insertion part; 42-limiting part; 5-screw; 6-bottom plate; 7-sealing strip; 8-cover plate. DETAILED DESCRIPTION

[0024] In the description of this specification, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of this specification is usually placed when used. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on this specification.

[0025] Furthermore, the use of terms such as "horizontal" and "vertical" in this specification does not necessarily imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0026] In the description of this specification, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "setting", "installation", "connection" and "connection" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two components.

[0027] Example 1

[0028] like Figure 1-Figure 4 As shown, a mold for prefabricated concrete specimens with cracks includes a mold box for accommodating concrete, the mold box consisting of multiple side panels 1 and a bottom plate 6, and concrete is added to the mold box when preparing the concrete specimen; multiple through holes 11 are opened on at least two side panels 1, and the axes of the through holes 11 are perpendicular to the plate surfaces of the side panels 1; some or all of the through holes 11 are passed through by screws 3, and the screws 3 located outside the mold box are connected to nuts 31, and the ends of the screws 3 near the mold box are fixedly connected to steel sheets 2, which serve as molds for the cracks; the remaining through holes 11 are blocked by blocking members 4 to prevent concrete from leaking from the through holes 11.

[0029] In this embodiment, rotating the nut 31 can pull the steel sheet 2, so that the steel sheet 2 is tightly attached to the inner wall of the side panel 1; continuing to rotate the nut 31 creates a pre-tightening force between the teeth of the nut 31 and the teeth of the screw 3, and the pre-tightening force acts on the outer wall of the side panel 1, that is, the nut 31 is pressed against the outer wall of the side panel 1, thereby creating a large friction force between the nut 31 and the outer wall of the side panel 1, and between the steel sheet 2 and the inner wall of the side panel 1, and the friction force can be used for locking to ensure the angular position of the steel sheet 2.

[0030] In this embodiment, before the nut 31 is rotated, the angular position of the steel sheet 2 needs to be adjusted to meet the angular position of the crack required by the test piece.

[0031] In summary, the angle of the steel sheet 2 is locked by structures such as the nut 31 and the screw 3, which effectively ensures the stability of the angle position of the steel sheet 2, that is, the adjustment of the crack formation angle is achieved; multiple through holes 11 are provided on multiple side panels 1, and cracks of different numbers and positions can be prepared on different surfaces of the concrete specimen. The angle of each steel sheet 2 can be adjusted independently, increasing the applicability of the concrete specimen.

[0032] Example 2

[0033] Based on Example 1, a feasible implementation method is further proposed.

[0034] A feasible implementation method is that the steel sheet 2 has a connecting portion 21, which is connected to the screw 3. The connecting portion 21 is cylindrical, and the diameter of the connecting portion 21 is equal to the diameter of the through hole 11. The connecting portion 21 is used to block the through hole 11 to prevent concrete from leaking from the through hole 11.

[0035] Furthermore, the connecting portion 21 is detachably connected to the screw rod 3, so that the steel sheet 2 can be replaced to form cracks of different depths and widths, such as the length of the steel sheet 2 is in the range of 40mm-70mm and the width is in the range of 10mm-15mm.

[0036] Specifically, regarding the detachable connection between the connecting part 21 and the screw rod 3, a countersunk hole for inserting the screw rod 3 can be provided at the connecting part 21, and a plurality of pin holes are provided at the countersunk hole and at the position where the countersunk hole is inserted on the screw rod 3. The pin holes on the connecting part 21 match the positions of the pin holes on the screw rod 3, and the axes of the pin holes are perpendicular to the axes of the connecting part 21 and the axes of the screw rod 3. There are bolts passing through the pin holes to connect the connecting part 21 and the screw rod 3. By connecting the connecting part 21 and the screw rod 3 with multiple bolts, the positioning connection between the steel sheet 2 and the screw rod 3 can be achieved.

[0037] It should be noted that the steel sheet 2 can also be fixedly connected to the screw rod 3 by welding. When the steel sheet 2 is replaced, the steel sheet 2 and the screw rod 3 need to be replaced as a whole.

[0038] Example 3

[0039] Based on any one of the implementations in Examples 1-2, a feasible implementation is further proposed.

[0040] A feasible implementation method is that for the blocking piece 4, the blocking piece 4 is composed of an inserting portion 41 and a limiting portion 42. The inserting portion 41 is used to insert into the through hole 11. The axial length of the inserting portion 41 matches the axial size of the through hole 11. The limiting portion 42 is fixed at one end of the inserting portion 41, and the geometric size of the limiting portion 42 is larger than the diameter of the through hole 11. The through hole 11 is blocked by the inserting portion 41, and the insertion size of the inserting portion 41 is limited by the limiting portion 42 to ensure that the end face of the inserting portion 41 is flush with the inner wall of the side plate 1.

[0041] Furthermore, the geometric shape of the above-mentioned blocking member 4 can be "T"-shaped or "L"-shaped, with one side being the insertion portion 41 and the other side being the limiting portion 42; the setting of the blocking member 4 can effectively prevent depressions or protrusions from occurring on the surface of the concrete specimen.

[0042] A feasible implementation method is that an elastic gasket is sleeved on the screw 3; after the mold is assembled, the elastic gasket is located between the nut 31 and the mold box, so that the pre-tightening force between the nut 31 and the screw 3 is converted into the elastic force of the elastic gasket, which can increase the upper limit value of the pre-tightening force, thereby increasing the upper limit value of the friction force between the nut 31 and the outer wall of the side plate 1, and between the steel sheet 2 and the inner wall of the side plate 1, further improving the angular position stability of the steel sheet 2.

[0043] A feasible implementation method is that the bottom plate 6 and the side plates 1 and the adjacent side plates 1 are detachably connected, so that the concrete specimens can be taken out after the concrete specimens are prefabricated, that is, the mold box is disassembled and the bottom plate 6 and the side plates 1 are removed.

[0044] Furthermore, the bottom plate 6 and the side plates 1 , as well as adjacent side plates 1 , are connected via screws 5 .

[0045] In a feasible implementation manner, the mold further comprises a cover plate 8, which can be directly placed on the top of the mold box to seal the top of the mold box and prevent rapid evaporation of moisture during prefabrication of the concrete specimen.

[0046] A feasible implementation method is that sealing strips 7 are provided between the bottom plate 6 and the side plate 1, and between adjacent side plates 1 to ensure the sealing performance of the mold box; corresponding holes are provided on the sealing strips 7, and screws 5 pass through the holes to fix the position of the sealing strips 7 and facilitate the installation of the sealing strips 7.

[0047] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A mold for prefabricating cracked concrete specimens, characterized by: The invention comprises a mold box for accommodating concrete, the mold box being composed of a plurality of side panels (1) and a bottom panel (6); a plurality of through holes (11) are provided on at least two of the side panels (1), the axes of the through holes (11) being perpendicular to the panel surfaces of the side panels (1); a screw (3) passes through part or all of the through holes (11), the screw (3) located outside the mold box being connected to a nut (31), and a steel sheet (2) being fixedly connected to the end of the screw (3) near the inside of the mold box; and the remaining through holes (11) being blocked by a blocking member (4).

2. The mold according to claim 1, characterized in that: The steel sheet (2) has a connecting portion (21) connected to the screw (3). The connecting portion (21) is cylindrical, and the diameter of the connecting portion (21) is equal to the diameter of the through hole (11).

3. The mold according to claim 2, characterized in that: The connecting portion (21) is detachably connected to the screw rod (3).

4. The mold according to claim 3, characterized in that: The connecting portion (21) has a countersunk hole for inserting the screw (3), and a plurality of pin holes are provided at the countersunk hole and at the position on the screw (3) where the countersunk hole is inserted. The pin holes on the connecting portion (21) match the positions of the pin holes on the screw (3), and the axes of the pin holes are perpendicular to the axes of the connecting portion (21) and the screw (3). Bolts pass through the pin holes to connect the connecting portion (21) and the screw (3).

5. The mold according to claim 1, characterized in that: The blocking member (4) is composed of an inserting portion (41) and a limiting portion (42). The inserting portion (41) is used to be inserted into the through hole (11). The axial length of the inserting portion (41) matches the axial size of the through hole (11). The limiting portion (42) is fixed to one end of the inserting portion (41), and the geometric size of the limiting portion (42) is larger than the diameter of the through hole (11).

6. The mold according to claim 1, characterized in that: An elastic gasket is sleeved on the screw rod (3); after the mold is assembled, the elastic gasket is located between the nut (31) and the mold box.

7. The mold according to claim 1, characterized in that: The bottom plate (6) and the side plates (1), as well as adjacent side plates (1), are detachably connected.

8. The mold according to claim 7, characterized in that: The bottom plate (6) and the side plates (1), as well as adjacent side plates (1), are connected via screws (5).

9. The mold according to claim 1, characterized in that: Also included is a cover plate (8) for closing the top of the mold box.

10. The mold according to claim 1, characterized in that: Sealing strips (7) are provided between the bottom plate (6) and the side plates (1), and between adjacent side plates (1).

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