An interface slotting positioning mold for a concrete superposition test piece

Abstract

The utility model discloses an interface grooving positioning mould of concrete superimposed test piece, its structure is, is provided with Z shape partition in a rectangular box body, makes the box body inner chamber present two L shape accommodating spaces along the distribution of box body length and mutually opposite and close, Z shape partition includes a riser and two horizontal boards, and the riser is by groove board and guard board mutually pasted together, and a plurality of strip grooves leading to lower edge are opened on the lower part plate body of groove board, and the length of each strip groove keeps consistent. The utility model discloses the riser only needs two boards, and has reduced the difficulty of installation and disassembly mould.

Description

Technical Field

[0001] This utility model relates to a building mold, specifically a grooved positioning mold for concrete composite specimens. Background Technology

[0002] In the field of construction engineering, concrete structures, as a core component of infrastructure, directly affect the service life of projects and the safety of people's lives and property due to their safety and durability. However, with the increase in service time, many existing concrete structures inevitably face various damage and performance degradation problems. Strengthening old concrete structures has become a crucial step in ensuring their continued safe use. Structural strengthening generally employs the method of increasing the cross-section, which involves pouring new concrete and reinforcing it with steel bars on top of the existing concrete. The interface between the old and new concrete is a very important influencing factor, directly determining the effectiveness of the strengthening. Grooving, as a method of interface treatment, allows for a relatively direct comparison of the impact of interface roughness on strength when studying the interfacial bonding performance of concrete. In the research process, the strength of the interface between the old and new concrete is generally evaluated by fabricating composite specimens.

[0003] Existing molds for making test specimens have grooves on them, which allow the poured concrete to naturally form grooves after it hardens. However, existing molds with grooves are made by nailing multiple wooden boards together to form the grooves, but the number of wooden boards is greater than the number of grooves. Therefore, installation and disassembly must be carried out in sections, and multiple wooden boards must be operated sequentially, which makes installation and disassembly inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide an interface grooving positioning mold for composite concrete specimens, so as to solve the problem of inconvenient installation and disassembly of existing molds.

[0005] The technical solution of this utility model is as follows:

[0006] A grooving positioning mold for a composite concrete specimen includes a box with an opening at the top and a partition plate vertically arranged inside the box to divide the box into two parts. The partition plate includes a vertical plate and two horizontal plates. The vertical plate includes a groove plate and a protective plate that is attached to the surface of the groove plate. The thickness of the vertical plate is the sum of the thicknesses of the groove plate and the protective plate. Several grooves penetrating the thickness of the groove plate are formed on the lower edge of the groove plate. Each groove extends from one edge of the groove plate through that edge and into the interior, but the length of the groove does not extend through the height of the groove plate.

[0007] Furthermore, adhesive tape is provided at the part of the groove plate that contacts the concrete and at the part of the guard plate that contacts the groove of the groove plate.

[0008] Furthermore, the groove of the slot plate is connected to the bottom of the box body; one horizontal plate is connected to the surface of the vertical plate and the inner wall of the box body, and another horizontal plate is connected to the other surface of the vertical plate and the other opposite inner wall of the box body; the two horizontal plates are located at the left and right ends of the vertical plate respectively.

[0009] Furthermore, both the groove plate and the protective plate are made of PVC foam board.

[0010] Furthermore, an adhesive layer is provided between the groove plate and the guard plate.

[0011] Furthermore, the height of the groove plate is equal to the height of the protective plate, and the height of the strip groove in the groove plate is greater than the height of the box body.

[0012] This invention improves the efficiency of mold installation and subsequent disassembly by cutting grooves on a single piece of PVC foam board, using only two boards for the vertical plate. Plastic tape wrapped around the groove plate and guard plate on the side in contact with the old concrete makes the contact surface between the groove positioning template and the concrete smoother. The lightweight nature of the rigid PVC foam board reduces the difficulty of demolding and prevents damage to the groove during demolding. The adhesive layer between the groove plate and guard plate prevents the poured concrete from seeping into the gap between the two plates after filling the mold groove, ensuring the regularity of the concrete groove. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a structural diagram of the vertical plate.

[0015] Figure 3 This is a schematic diagram of a concrete specimen obtained by casting using this utility model.

[0016] The components are: 1. Groove plate; 2. Protective plate; 3. Adhesive layer; 4. Adhesive tape; 5. Horizontal plate; 6. Side plate; 7. Old concrete block; 8. New concrete block. Detailed Implementation

[0017] The present invention will now be described in further detail.

[0018] like Figure 1 and Figure 2 As shown, the interface grooving positioning mold for the composite concrete specimen of this utility model has a Z-shaped partition plate in a rectangular box, so that the inner cavity of the box presents two L-shaped accommodating spaces distributed along the length of the box and facing each other; the Z-shaped partition plate includes a vertical plate and two horizontal plates 5; the vertical plate is formed by the groove plate 1 and the guard plate 2 being attached to each other, and several strip grooves leading to the lower edge are opened on the lower part of the groove plate 1, and the length of each strip groove is consistent.

[0019] The strip groove runs through the lower edge of the groove plate, and the length of the strip groove is less than the length of the groove plate.

[0020] The partition stands vertically inside the box. The groove of the slotted plate 1 connects to the bottom of the box. The vertical plate is parallel to one inner wall of the box. The horizontal plate 5 is perpendicular to the vertical plate. Two sides of one horizontal plate 5 connect to the surface of the vertical plate and the inner wall of the box, respectively. Two sides of the other horizontal plate 5 connect to the other surface of the vertical plate and the other opposite inner wall of the box, respectively. That is, one side of the horizontal plate 5 connects to the surface of the slotted plate 1, and the other side connects to the inner wall of the box opposite to the slotted plate 1; another side of the horizontal plate 5 connects to the surface of the guard plate 2, and the other side connects to the inner wall of the box opposite to the guard plate 2. An adhesive layer 3 connects the slotted plate 1 and the guard plate 2. Pneumatic nails are used to connect the horizontal plate 5 to the slotted plate 1, the guard plate 2, and the inner wall of the box.

[0021] Two horizontal plates 5 are located at the left and right ends of the vertical plate, dividing the box into two L-shaped storage spaces.

[0022] Both the groove plate 1 and the guard plate 2 of this utility model are made of PVC foam board.

[0023] This invention also incorporates adhesive tape at the contact points between the groove plate and the concrete, as well as at the contact points between the guard plate and the groove opening of the groove plate. The non-adhesive, smooth side of the tape faces outwards, while the adhesive side adheres tightly to the plate surface, ensuring that the non-adhesive side of the tape contacts the concrete. This invention utilizes readily available materials and is low in cost.

[0024] In this invention, a protective plate is used as the bottom of the groove. Compared with directly cutting grooves on a wooden board and retaining the bottom of the groove, this invention significantly reduces the roughness of the interface between the old concrete and the protective plate, increases the convenience of demolding, improves the flatness of the old concrete groove after demolding, and realizes integrated demolding.

[0025] The height of both the vertical plate and the horizontal plate 5 is 10cm higher than the height of the box body, and the height of the groove plate 1 and the protective plate 2 is the same. The height of the strip groove in the groove plate 1 is 1cm higher than the height of the box body to avoid damaging the upper end of the strip groove when disassembling the mold.

[0026] The box body and the horizontal plate 5 in this utility model are both architectural wooden formwork, which have a layer of film on them.

[0027] This invention also uses two horizontal plates 5 to prevent the two types of concrete from becoming one; the mold made by this invention is for measuring the strength of the interface between the two types of concrete, so a gap is left between the two types of concrete by using horizontal plates.

[0028] The manufacturing process of this utility model is as follows: Two equal-sized boards are cut from PVC foam board according to the concrete interface dimensions. One of them is selected as the groove board 1, and grooves are cut on it according to the test plan. The side of the groove board that contacts the concrete is wrapped with tape. The other PVC foam board is used as the protective board 2, and the part that contacts the groove is also wrapped with tape. In order to improve the efficiency of demolding later, the height of both foam boards should be 10cm higher than the main formwork. An adhesive layer 3 is set between the groove board 1 and the protective board 2. After the glass glue is evenly applied to the contact area of ​​the two boards, it is compacted to form an adhesive layer. After the glass glue solidifies, a vertical board is formed, which is connected to the horizontal board 5 with air nails. The main formwork 6 is cut according to the design dimensions of the structure and connected with air nails to form a box. The connected vertical board and horizontal board 5 are placed in the box, and the horizontal board 5 is connected to the inner wall of the box with air nails, dividing the box into two non-communicating parts. When removing the slotted positioning mold, first use a flathead screwdriver to pry open one side of the slotted plate and the protective plate, then pull out the pneumatic nail to separate it from the horizontal plate 5, then bend it back and forth, and finally pull it outward as a whole.

[0029] like Figure 3 As shown, when using this invention, in order to study the strength of the interface between new and old concrete, it is first necessary to prepare both types of concrete. The old concrete is poured onto one side of the trough slab. Two days after pouring, the vertical plate is removed, and then the new concrete is poured. After pouring, the horizontal plate and the box are removed. At this point, the old concrete block 7 and the new concrete block 8 interlock to form a composite specimen. Simultaneously, due to the presence of the horizontal plate, a gap is left between the old and new concrete, facilitating the measurement of the bond strength of the interface by compression and shear.

Claims

1. A grooving and positioning mold for a composite concrete specimen, characterized in that, A Z-shaped partition is provided in a rectangular box, so that the inner cavity of the box presents two L-shaped receiving spaces that are distributed along the length of the box and are opposite to each other; the Z-shaped partition includes a vertical plate and two horizontal plates; the vertical plate is formed by a grooved plate and a protective plate being attached to each other, and several strip-shaped grooves leading to the lower edge are opened on the lower plate of the grooved plate, and the length of each strip-shaped groove is consistent.

2. The interface grooving positioning mold for composite concrete specimens according to claim 1, characterized in that, Adhesive tape is applied to the parts of the trough plate that come into contact with the concrete and to the parts of the guard plate that come into contact with the groove of the trough plate.

3. The interface grooving positioning mold for composite concrete specimens according to claim 1, characterized in that, The groove of the slot plate is connected to the bottom of the box body; one horizontal plate is connected to the surface of the vertical plate and the inner wall of the box body, and another horizontal plate is connected to the other surface of the vertical plate and the other opposite inner wall of the box body; the two horizontal plates are located at the left and right ends of the vertical plate respectively.

4. The interface grooving positioning mold for composite concrete specimens according to claim 1, characterized in that, Both the groove plate and the protective plate are made of PVC foam board.

5. The interface grooving positioning mold for composite concrete specimens according to claim 1, characterized in that, An adhesive layer is placed between the groove plate and the guard plate.

6. The interface grooving positioning mold for composite concrete specimens according to claim 1, characterized in that, The height of the groove plate is equal to the height of the protective plate, and the height of the strip groove in the groove plate is greater than the height of the box body.

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