Concrete penetrating crack prefabricating device

Abstract

The utility model discloses a concrete through crack prefabricating device, which belongs to the technical field of performance test and detection of rear anchoring parts, and comprises a bottom die, a side die and an end die, the end die is arranged on the bottom die, a steel bar positioning hole is arranged on the end die, the side die is arranged on the bottom die, a natural through crack inducing die is arranged on the side die, and the natural through crack inducing die is arranged on the bottom die. Tensile steel bars in concrete are fixed to special equipment to be stretched or compressed, so that the gap width of the prefabricated concrete with the penetrating cracks is changed, the tensile force is increased or decreased according to the measured width of the cracks, the width of the cracks is expanded to meet the test requirements, the crack widths of different degrees of the cracks are controlled, and the test efficiency is improved. Static tests such as tensile performance and shear performance tests of the rear anchoring part and dynamic tests such as reciprocating opening and closing tensile performance tests and anti-seismic performance special tests of cracks in cracked concrete are detected through the testing tool, so that experimental results are more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of testing the anchoring performance of post-anchoring parts in cracked concrete specimens, and particularly relates to a device for prefabricating concrete through cracks. Background Technique

[0002] For static tests such as tensile performance and shear performance tests of post-anchoring parts for concrete in cracked concrete, and dynamic tests such as crack reciprocating opening and closing tensile performance tests and special seismic performance tests in cracked concrete. When static and dynamic tests need to be carried out on specimens of cracked concrete with through cracks, first, physical slitting is carried out through a professional slitting device to form natural through cracks in the concrete specimens. The cracks can freely close through the tensile reinforcement. The post-anchoring parts are installed in the closed state, and the tensile reinforcement of the concrete specimens is stretched through special equipment to make the through cracks expand to the width required by the test.

[0003] In the prior art, artificial cracks formed by splicing two independent concrete substrates are straight in the crack direction, with no tortuosity in the up and down through cracks, and no high-strength tensile reinforcement is configured. The cracks cannot close naturally and need to be closed by external extrusion force through special equipment outside the concrete, so that the installed anchor parts are tested under the action of external extrusion force, and the experimental results are inaccurate. Summary of the Utility Model

[0004] To solve the above problems, the present technology provides a device for prefabricating concrete through cracks, which does not require external extrusion, the cracks can close naturally, and the through cracks are tortuous, conforming to the crack characteristics of the engineering site.

[0005] To solve the above technical problems, the technical solution provided by the utility model is: a device for prefabricating concrete through cracks, including a through-crack concrete mold, the through-crack concrete mold includes a bottom mold, side molds and end molds. There are two end molds located on both sides above the bottom mold, and the end molds are provided with steel bar positioning holes; the side molds are arranged on the bottom mold, there are two side molds arranged front and back between the end molds, and the connection between the side molds and the bottom mold is detachable, and the side molds are provided with natural through-crack induction molds.

[0006] Preferably, the bottom mold, side templates and end templates are all prepared from a material with high strength, good toughness, easy to process and form, and hard texture and not easy to deform.

[0007] Preferably, the natural through-crack induction mold is arranged in a triangle, the natural through-crack induction mold is located on the opposite side surfaces of the two side plates and is evenly spaced, and the spacing is determined according to the requirements of the test equipment. The angle range of the natural through-crack induction mold is 30°-60°.

[0008] Preferably, 8 steel bar positioning holes are provided, with 4 at each end. The opening size of the steel bar positioning holes is determined according to the size of the tension steel bars.

[0009] Preferably, the through-crack concrete mold further includes bolts. There are at least 20 bolts for fixing the connection between the side mold and the bottom mold.

[0010] Preferably, a layer of silicone oil release agent is coated on the inner wall of the through-crack concrete mold.

[0011] The advantages of the present utility model compared with the prior art are as follows: By fixing the tension steel bars in the concrete to a special device to stretch or compress the tension steel bars, the width of the gap in the precast concrete with through cracks is changed. According to the measured width of the crack, the tension is increased or decreased, and the width of the crack is expanded to meet the test requirements, controlling the crack width at different levels. And through the test tooling, static tests such as the tensile performance and shear performance tests of the post-anchorage, as well as dynamic tests such as the reciprocating opening and closing tensile performance test of the crack in the cracked concrete and the special seismic performance test, the experimental results are made more accurate. Description of the Drawings

[0012] Figure 1 is a three-dimensional view of a concrete through-crack prefabrication device of the present utility model.

[0013] Figure 2 is a top view structural schematic diagram of a concrete through-crack prefabrication device of the present utility model.

[0014] Figure 3 is a schematic diagram of a natural through-crack induction mold of a concrete through-crack prefabrication device of the present utility model.

[0015] Figure 4 is a schematic diagram of an end mold of a concrete through-crack prefabrication device of the present utility model.

[0016] As shown in the figure: 1. Bottom mold; 2. Side mold; 3. End mold; 4. Steel bar positioning hole; 5. Natural through-crack induction mold; 6. Bolt. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0018] In the description of the utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "equipped with", "connection", etc. shall be understood in a broad sense. For example, "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Combined with the attached Figure 1 、 Figure 2 There is a prefabrication device for concrete through cracks, including a through-crack concrete mold. The through-crack concrete mold includes a bottom mold 1, side molds 2, and end molds 3. There are two end molds 3 located on both sides above the bottom mold 1, and there are steel bar positioning holes 4 on the end molds 3; the side molds 2 are arranged on the bottom mold 1, there are two side molds 2 located between the end molds 3 and arranged front and back, and the connection between the side molds 2 and the bottom mold 1 is detachable, and there is a natural through-crack induction mold 5 on the side molds 2.

[0020] Combined with the attached Figure 1 The bottom mold 1, side mold 2 plates, and end mold 3 plates are all made of a material with high strength, good toughness, easy to process and form, and hard texture and not easy to deform.

[0021] Combined with the attached Figure 3 The natural through-crack induction mold 5 is arranged in a triangular shape, the natural through-crack induction mold 5 is located on the opposite sides of the two side plates and evenly spaced, and the spacing is determined according to the requirements of the test equipment. The angle range of the natural through-crack induction mold 5 is 30° - 60°.

[0022] Combined with the attached Figure 4 There are 8 steel bar positioning holes 4, distributed with 4 at each end. The opening size of the steel bar positioning holes 4 is determined according to the size of the tensile steel bars. The tensile steel bars need to pass through the holes without friction, and the setting of the steel bar positioning holes 4 is determined according to the connection tooling of the test equipment.

[0023] Combined with the attached Figure 1 The through-crack concrete mold also includes bolts 6. There are at least 20 bolts 6 for fixing the connection between the side mold 2 and the bottom mold 1.

[0024] Combined with the attached Figure 1 A layer of silicone oil release agent is coated on the inner wall of the through-crack concrete mold and evenly applied with a fine brush or a fine cotton cloth, which can ensure the smoothness of the plane of the specimen after curing and forming.

[0025] When the present utility model is specifically implemented, the above-mentioned through-crack prefabrication device is used to prepare through-crack concrete specimens, and the specific preparation method is as follows:

[0026] S1: In the above-mentioned through-crack concrete mold, tensile steel bars with different tensile strengths are selected according to the required crack width, and respectively pass through the reserved hole positions of the end mold 3 and extend at least 30 cm beyond the mold. After positioning, with the natural through-crack induction mold 5 on the side plate as the center, an opening pipe is embedded on the center line, and stirrups are used for reinforcement at the central position of the concrete on both sides of it.

[0027] S2: Pour the mixed concrete into the through-crack concrete mold in S1. After the through-crack concrete mold is filled, insert a vibrating rod and vibrate until slurry flows out of the mold surface. Then cut the outer surface of the concrete specimen mold and place it in a temperature control room. Demolding treatment is carried out within 48h - 72h to obtain a concrete specimen;

[0028] S3: Cure the concrete specimen obtained in S2 for 28d to obtain the concrete specimen.

[0029] Preferably, the tensile steel bar in S1 is selected as a high-performance steel bar with a yield strength of 1000 MPa.

[0030] Preferably, the stirrups in S1 are selected according to the size of the specimen, and ensure that the concrete does not crack or break away from the tensile steel bar when the tensile steel bar is under tension.

[0031] Preferably, to ensure the accuracy of experimental data, the specimens after demolding should be cured under standard conditions (controlled temperature: 20 ± 2 °C, controlled humidity ≥ 95%), and the curing time is 28d. The records of specimen production and curing should also comply with the specification requirements of the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" GB / T50081.

[0032] The above describes the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the creative purpose of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. A prefabrication device for concrete penetrating cracks, characterized in that: Including a concrete mold with a through crack, the concrete mold with a through crack includes a bottom mold (1), side molds (2) and end molds (3). There are two end molds (3) located on both sides above the bottom mold (1), and steel bar positioning holes (4) are provided on the end molds (3); the side molds (2) are arranged on the bottom mold (1), there are two side molds (2) arranged front and back between the end molds (3), the connection between the side molds (2) and the bottom mold (1) is detachable, and a natural through crack induction mold (5) is provided on the side molds (2).

2. The prefabrication device for concrete penetrating cracks according to claim 1, characterized in that: The natural through crack induction mold (5) is arranged in a triangular shape, the natural through crack induction mold (5) is located on the opposite sides of the two side plates and is evenly spaced, and the angle range of the natural through crack induction mold (5) is 30°-60°.

3. The prefabrication device for concrete penetrating cracks according to claim 1, characterized in that: Eight steel bar positioning holes (4) are provided, with four at each end, and the opening size of the steel bar positioning holes (4) is determined according to the size of the tensile steel bars.

4. A prefabrication device for concrete through-cracks according to claim 1, characterized in that: The concrete mold with a through crack further includes bolts (6), at least 20 bolts (6) are provided for fixing the connection between the side mold (2) and the bottom mold (1).

5. A prefabrication device for concrete through cracks according to claim 1, characterized in that: A layer of silicone oil release agent is coated on the inner wall of the concrete mold with a through crack.

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