Steel plate concrete normal adhesive property test piece preparation mold

Abstract

The utility model discloses a steel plate concrete normal adhesive property test piece preparation mold which comprises a bottom mold, a first side mold, a second side mold, a third side mold and a fourth side mold, the bottom mold, the first side mold, the second side mold, the third side mold and the fourth side mold enclose to form a cuboid space with an open top and a closed bottom, and the space is used for pouring concrete; a second drawing reinforcing steel bar perpendicular to the side die is welded to the center of the fourth side die, an open hole is formed in the third side die, and the first drawing reinforcing steel bar penetrates through the hole. The bottom die, the first side die, the second side die, the third side die and the fourth side die are all made of steel plates. The drawing steel bar is welded to the center of the fourth side mold, so that the fourth side mold, the drawing steel bar and poured concrete form a whole, and integrated preparation of a steel plate and the concrete and accurate centering and positioning of a drawing rod piece are achieved; the bottom die and the side dies are all made of steel plates and spliced into a whole through bolts, and the die is high in rigidity, convenient to splice, not prone to deformation and capable of being repeatedly used.

Description

Technical Field

[0001] This utility model relates to the field of reinforced concrete performance testing technology, and in particular to a mold for preparing a steel plate concrete normal bond performance specimen. Background Technology

[0002] Existing steel-concrete composite structures are mostly steel-concrete composite structures. In these structures, the steel plates have very smooth surfaces, resulting in weak adhesion between the steel plates and concrete. This makes the concrete cover on the steel surface prone to cracking and peeling, leading to insufficient bond strength between the steel plates and concrete in both the in-plane and normal directions to meet structural requirements. Therefore, to investigate the normal bond performance between the steel plate and concrete interface, steel-concrete normal bond tests are typically used.

[0003] The normal bond test for steel-concrete plates typically employs a pull-out test, where the applied pull-out force is perpendicular to the bond interface between the steel plate and concrete. This requires strict alignment between the pulled-out reinforcing bar and the specimen, meaning the line of action of the normal tensile force is aligned with the centroidal axis of the member. Currently, specimens for the normal bond pull-out test of steel-concrete plates are often designed as cubic concrete sections with a bottom steel plate. The normal bond performance between the two is tested by applying a tensile force perpendicular to the bond interface.

[0004] However, there is currently a lack of standardized methods for testing the normal bond performance between steel plates and concrete, and there are no uniform requirements for specimen preparation. Existing specimens are mostly prepared using wooden molds, which are cumbersome to set up. Wooden molds will deform after being exposed to moisture and sunlight, affecting the dimensional accuracy of the specimens. The molds cannot be reused, and it is difficult to achieve precise alignment of the pull-out rods embedded in the specimens. Utility Model Content

[0005] Purpose of the invention: To address the shortcomings of current methods, such as the inability to prepare specimens in an integrated manner, the inability to reuse specimen preparation molds, and the difficulty in achieving precise alignment of pull-out rods, this utility model provides a specimen preparation mold for the normal bonding performance of steel plate concrete.

[0006] Technical Solution: To solve the above problems, this utility model adopts a mold for preparing a steel plate concrete normal bond performance specimen, including a bottom mold, a first side mold, a second side mold, a third side mold, and a fourth side mold. The bottom mold, the first side mold, the second side mold, the third side mold, and the fourth side mold surround to form a cuboid space with an open top and a closed bottom, which is used for pouring concrete. A second pull-out steel bar perpendicular to this side mold is welded to the center of the fourth side mold. An opening is made on the third side mold for placing a first pull-out steel bar. The bottom mold, the first side mold, the second side mold, the third side mold, and the fourth side mold are all made of steel plate.

[0007] Furthermore, the bottom mold includes a top plate and bottom ribs installed at the bottom of the top plate, and the top plate has several screw holes.

[0008] Furthermore, the first side mold and the second side mold are arranged opposite to each other and have the same structure. The longitudinal section of the first side mold and the second side mold is L-shaped, including mutually perpendicular side plates and a bottom plate. The bottom plate has several screw holes and is fixedly connected to the top plate by bolts.

[0009] Furthermore, the first and second side molds are provided with two grooves on their side plates. The axial direction of the grooves is perpendicular to the bottom plate, and the grooves are vertically connected. The third and fourth side molds are installed in the grooves.

[0010] Furthermore, screw holes are also provided on the side plates. One end of the bolt is installed in the screw hole of the first side plate, and the other end of the bolt is installed in the screw hole of the second side plate.

[0011] Furthermore, reinforcing ribs are provided between the side plates and the bottom plate.

[0012] Furthermore, the axis of the second pulled steel bar is perpendicular to the outer side of the fourth side formwork, and the axis of the second pulled steel bar is parallel to the upper surface of the top plate.

[0013] Beneficial effects: Compared with the prior art, the significant advantages of this utility model are (1) welding the pull-out steel bar at the center of the fourth side mold, so that the fourth side mold, the pull-out steel bar and the poured concrete form a whole, realizing the integrated preparation of steel plate and concrete and the precise centering and positioning of the pull-out rod; (2) both the bottom mold and the side mold are made of steel plate and are spliced ​​together as a whole with the help of bolts. The mold has high rigidity, is easy to disassemble and assemble, and can be reused. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the mold for preparing the specimen of this utility model;

[0015] Figure 2 This is a schematic diagram of the bottom mold structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the first side mold structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the third side mold structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the fourth side mold structure of this utility model. Detailed Implementation

[0019] like Figure 1As shown, this embodiment of a steel plate concrete normal bond performance specimen preparation mold includes a bottom mold 1, a first side mold 2, a second side mold 3, a third side mold 4, and a fourth side mold 5. The bottom mold 1, first side mold 2, second side mold 3, third side mold 4, and fourth side mold 5 surround each other to form a cuboid space with an open top and a closed bottom, which is used for pouring concrete. The bottom mold 1, first side mold 2, second side mold 3, third side mold 4, and fourth side mold 5 are all made of steel plates to improve the rigidity of the mold, making it less prone to deformation and reusable.

[0020] like Figure 2 As shown, the bottom mold 1 includes a top plate 102 and a bottom rib 103 installed at the bottom of the top plate 102. The top plate 102 has four screw holes 101.

[0021] like Figure 3 As shown, the first side mold 2 and the second side mold 3 are arranged opposite each other and have the same structure. The longitudinal section of the first side mold 2 and the second side mold 3 is L-shaped, including mutually perpendicular side plates 204 and bottom plates 205. Stiffening ribs 206 are also provided between the side plates 204 and the bottom plate 205 to improve the rigidity of the side molds, preventing bending of the steel plates during concrete pouring. Two screw holes 201 are opened on the bottom plate 205, and the bottom plate 205 is fixedly connected to the top plate 102 by bolts. Screw holes 202 are also opened on the side plates 204. One end of the bolt is installed in the screw hole 202 of the side plate of the first side mold 2, and the other end of the bolt is installed in the screw hole 202 of the side plate of the second side mold 3. The side plate 204 is provided with two grooves 203. The axial direction of the grooves 203 is perpendicular to the bottom plate 205, and the grooves 203 are vertically connected. The width of the grooves 203 is slightly larger than the thickness of the third side mold 4 and the fourth side mold 5. The third side mold 4 and the fourth side mold 5 are installed in the grooves 203.

[0022] like Figure 4 As shown, a hole 401 for placing the first pull-out steel bar 402 is opened at the center of the third side formwork 4, and the first pull-out steel bar 402 is placed in the hole 401. Figure 5 As shown, a second pull-out steel bar 501 perpendicular to the side mold 5 is welded to the center of the outer side of the fourth side mold 5. In this mold, the fourth side mold 5 is the specimen steel plate, and the pull-out steel bar 501 is welded to the bottom to form a whole with the concrete specimen.

[0023] The usage process of this utility model is as follows: Assemble the bottom mold 1 and the first side mold 2, and position the corresponding bolt holes according to the required dimensions of the concrete cross-section. Align the bolt holes 101 of the bottom mold 1 with the bolt holes 201 of the first side mold 2 and connect them with bolts. Assemble the bottom mold 1 and the second side mold 3 in the same manner. Vertically weld the pull-out steel bar 501 at the center of the bottom of the fourth side mold 5. Insert the third side mold 4 and the fourth side mold 5 into the grooves 203 reserved in the side molds 2 and 3, respectively. Pass a wire rod through the bolt holes 202 of the side molds 2 and 3 and fix it with bolts. Pass the first pull-out steel bar 402 through the reserved round hole 401 on the side mold 4. After assembly, concrete can be poured, so that the concrete, the fourth side mold 5, the first pull-out steel bar 402, and the second pull-out steel bar 501 are poured to form a whole, realizing the integrated preparation of steel plate, concrete, and pull-out steel bar.

Claims

1. A mold for preparing specimens for the normal bond performance of steel plate concrete, characterized in that, The system includes a bottom mold (1), a first side mold (2), a second side mold (3), a third side mold (4), and a fourth side mold (5). The bottom mold (1), the first side mold (2), the second side mold (3), the third side mold (4), and the fourth side mold (5) surround each other to form a cuboid space with an open top and a closed bottom. This cuboid space is used for pouring concrete. The third side mold (4) has an opening (401) at its center, and a first pull-out steel bar (402) is placed in the opening (401). The first pull-out steel bar (402) passes through and is perpendicular to the third side mold (4). The fourth side mold (5) has a second pull-out steel bar (501) welded to the center of its outer side, which is perpendicular to the fourth side mold (5). The bottom mold (1), the first side mold (2), the second side mold (3), the third side mold (4), and the fourth side mold (5) are all made of steel plates.

2. The mold for preparing steel plate concrete normal bond performance test specimens as described in claim 1, characterized in that, The bottom mold (1) includes a top plate (102) and bottom ribs (103) welded to the bottom of the position around the top plate (102). The top plate (102) has several screw holes (101).

3. The mold for preparing steel plate concrete normal bond performance specimens as described in claim 2, characterized in that, The first side mold (2) and the second side mold (3) are arranged opposite each other and have the same structure. The longitudinal section of the first side mold (2) and the second side mold (3) is L-shaped, including mutually perpendicular side plates (204) and bottom plates (205). The bottom plate (205) has several screw holes (201) and is fixedly connected to the top plate (102) by bolts.

4. The mold for preparing steel plate concrete normal bond performance specimens as described in claim 3, characterized in that, The side plate (204) is provided with two grooves (203), the axial direction of the grooves (203) is perpendicular to the bottom plate (205), and the grooves (203) are vertically connected. The third side mold (4) and the fourth side mold (5) are installed in the grooves (203).

5. The mold for preparing steel plate concrete normal bond performance specimens as described in claim 4, characterized in that, The side plate (204) also has screw holes (202). One end of the bolt is installed in the screw hole (202) of the side plate of the first side mold (2), and the other end of the bolt is installed in the screw hole (202) of the side plate of the second side mold (3).

6. The mold for preparing steel plate concrete normal bond performance specimens as described in claim 5, characterized in that, A stiffening rib (206) is also provided between the side plate (204) and the bottom plate (205).

7. The mold for preparing steel plate concrete normal bond performance specimens as described in claim 6, characterized in that, The axis of the second pull-out steel bar (501) is perpendicular to the outer side of the fourth side formwork (5), and the axis of the second pull-out steel bar (501) is parallel to the upper end face of the top plate (102).

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