Test auxiliary device for drawing experiment of special-shaped curved steel bar

Abstract

The utility model relates to an auxiliary testing device for a drawing experiment of a special-shaped curved steel bar, which comprises a pressure-bearing cushion block placed on concrete, the upper end face of the concrete is a special-shaped surface, the upper part of the concrete is vertically provided with a steel bar, the pressure-bearing cushion block is in a circular truncated cone shape, and the middle part of the pressure-bearing cushion block is provided with a vertically arranged circular through hole; the lower end face of the pressure-bearing cushion block is a special-shaped curved surface attached to the special-shaped surface of the upper end of concrete, the special-shaped curved surface is coated with a rubber layer, the upper end face of the pressure-bearing cushion block is a flat horizontal plane, and the horizontal plane is perpendicular to the stretching direction of the steel bars. According to the utility model, the problems that the surface concrete is easy to damage and the test precision is influenced by the fluctuation of the drawing force value because the surface is uneven and the concentrated stress is larger when the anchor rod drawing instrument is used for drawing are solved; the flat stress surface platform is formed by the pressure-bearing cushion block and the original concrete, and meanwhile, the platform is not in direct contact with the reinforcing steel bars, so that the drawing force test is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering detection, in particular to a test auxiliary device for pulling experiments of special-shaped curved surface steel bars. Background Art

[0002] In construction projects, the anchoring strength of steel bars needs to be tested. The existing technology uses an anchor puller for testing, which converts manual mechanical energy into hydraulic energy and reads the maximum tensile force when the steel bar is pulled out. When pulling steel bars in curved structures such as tunnels, since the force-bearing surface of the anchor puller is a flat surface, the contact area is small when it contacts the concrete curved surface, which can easily damage the concrete surface and lead to inaccurate pull-out test results. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a test auxiliary device for pulling experiments on special-shaped curved steel bars, so as to solve the problem that due to the uneven surface, the concentrated stress of the anchor rod puller is large during pulling, which easily leads to damage of the surface concrete, and the fluctuation of the pulling force value affects the test accuracy.

[0004] The utility model solves the technical problem by adopting the following technical scheme: providing a test auxiliary device for pulling out experiments of special-shaped curved steel bars, comprising a pressure pad placed on concrete, the upper end face of the concrete being a special-shaped surface, steel bars being vertically arranged on the upper part of the concrete, the pressure pad being in the shape of a truncated cone, the middle part of the pressure pad being provided with a vertically arranged circular through hole, the aperture of the circular through hole being larger than the diameter of the steel bar, the circular through hole being used for allowing the steel bar to pass through, the lower end face of the pressure pad being a special-shaped curved surface fitted with the special-shaped surface of the upper end of the concrete, the special-shaped curved surface being coated with a rubber layer, the upper end face of the pressure pad being a flat horizontal surface, and the horizontal surface being perpendicular to the stretching direction of the steel bar.

[0005] As a supplement to the technical solution described in the utility model, the pressure-bearing pad is made of cast iron.

[0006] As a supplement to the technical solution described in the utility model, a mounting through hole is vertically opened in the middle of the pressure-bearing pad, a wear-resistant sleeve is embedded in the mounting through hole, and the circular through hole is the inner hole of the wear-resistant sleeve.

[0007] As a supplement to the technical solution described in the utility model, the mounting through hole is a circular hole, a rectangular hole or an elliptical hole.

[0008] Beneficial effects: The utility model relates to a test auxiliary device for pulling out experiments on special-shaped curved steel bars, which solves the problem that due to the uneven surface, the concentrated stress of the anchor puller is large during pulling, which easily leads to damage of the surface concrete, and the fluctuation of the pulling force value affects the test accuracy; a flat force surface platform is formed together with the original concrete by a pressure pad, and at the same time, there is no direct contact between the platform and the steel bar, which has no effect on the pulling force test; the special-shaped curved surface is coated with a rubber layer, and the rubber layer can undergo a certain deformation, so that it can better fit the special-shaped surface of the upper end of the concrete; a replaceable wear-resistant sleeve is provided to facilitate later replacement and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a cross-sectional view of the pressure-bearing pad described in the utility model.

[0011] Illustration: 1. Pressure pad, 2. Concrete, 3. Steel bar, 4. Special-shaped curved surface, 5. Rubber layer, 6. Wear-resistant sleeve, 7. Horizontal plane, 8. Circular through hole. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0013] The embodiment of the utility model relates to a test auxiliary device for pulling out special-shaped curved steel bars, such as Figure 1-2 As shown, it includes a pressure pad 1 placed on concrete 2, the upper end face of the concrete 2 is a special-shaped surface, and a steel bar 3 is vertically arranged on the upper part of the concrete 2. The pressure pad 1 is in the shape of a truncated cone, and a vertically arranged circular through hole 8 is provided in the middle of the pressure pad 1. The aperture of the circular through hole 8 is larger than the diameter of the steel bar 3, and the circular through hole 8 is used for the steel bar 3 to pass through. The lower end face of the pressure pad 1 is a special-shaped curved surface 4 that fits the special-shaped surface of the upper end of the concrete 2, and the special-shaped curved surface 4 is covered with a rubber layer 5. The upper end face of the pressure pad 1 is a flat horizontal surface 7, and the horizontal surface 7 is perpendicular to the stretching direction of the steel bar 3.

[0014] When in use, the pressure pad 1 is placed on the concrete 2, and the steel bars 3 on the concrete 2 pass through the circular through hole 8 in the middle of the pressure pad 1. The special-shaped curved surface 4 on the lower end face of the pressure pad 1 fits with the special-shaped surface on the upper end of the concrete 2. Since the special-shaped curved surface 4 is covered with a rubber layer 5, the rubber layer 5 can undergo a certain deformation, so that it can better fit the special-shaped surface on the upper end of the concrete 2. The flat horizontal surface 7 on the upper end face of the pressure pad 1 serves as the force-bearing surface of the anchor puller. The contact area is relatively large, and it is not easy to damage the surface of the concrete 2, while ensuring the accuracy of the pull-out test results.

[0015] The pressure pad 1 is made of cast iron; cast iron is an alloy mainly composed of iron, carbon and other elements. Its advantages are mainly reflected in the following aspects: good high temperature resistance, can maintain good mechanical properties at high temperatures; good wear resistance, often used as various bearings, gears and other mechanical parts; cheap, can be used to make some occasions with low performance requirements. In addition, cast iron also has good casting properties, and can be used to manufacture parts of various shapes and sizes through casting technology.

[0016] A mounting through hole is vertically opened in the middle of the pressure pad 1, and a wear-resistant sleeve 6 is embedded and installed in the mounting through hole. The circular through hole 8 is the inner hole of the wear-resistant sleeve 6. An interference fit is adopted between the wear-resistant sleeve 6 and the mounting through hole. When replacement is needed, the old wear-resistant sleeve 6 can be knocked out of the mounting through hole by a tool, and then the new wear-resistant sleeve 6 can be knocked into the mounting through hole. A replaceable wear-resistant sleeve 6 is provided to facilitate later replacement and reduce maintenance costs.

[0017] The mounting through hole is a circular hole, a rectangular hole or an elliptical hole.

[0018] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0019] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0020] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0021] The above is a detailed introduction to a test auxiliary device for pulling out experiments on special-shaped curved steel bars provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technicians in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A test auxiliary device for a pull-out test of a special-shaped curved steel bar, comprising a pressure pad (1) placed on concrete (2), wherein the upper end surface of the concrete (2) is a special-shaped surface, and a steel bar (3) is vertically arranged on the upper part of the concrete (2), characterized in that: The pressure-bearing pad (1) is in the shape of a truncated cone, and has a vertically arranged circular through hole (8) in the middle of the pressure-bearing pad (1). The diameter of the circular through hole (8) is larger than the diameter of the steel bar (3), and the circular through hole (8) is used for allowing the steel bar (3) to pass through. The lower end surface of the pressure-bearing pad (1) is a special-shaped curved surface (4) that fits the special-shaped surface of the upper end of the concrete (2), and the special-shaped curved surface (4) is coated with a rubber layer (5). The upper end surface of the pressure-bearing pad (1) is a flat horizontal surface (7), and the horizontal surface (7) is perpendicular to the tensile direction of the steel bar (3).

2. A test auxiliary device for pulling out special-shaped curved steel bars according to claim 1, characterized in that: The pressure bearing pad (1) is made of cast iron.

3. The test auxiliary device for pulling out special-shaped curved steel bars according to claim 1, characterized in that: A mounting through hole is vertically provided in the middle of the pressure-bearing pad (1), a wear-resistant sleeve (6) is embedded in the mounting through hole, and the circular through hole (8) is the inner hole of the wear-resistant sleeve (6).

4. The test auxiliary device for pulling out special-shaped curved steel bars according to claim 3, characterized in that: The mounting through hole is a circular hole, a rectangular hole or an elliptical hole.

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