Connecting device for ultimate tensile test of concrete core sample

Abstract

The utility model discloses a concrete core sample ultimate tensile test connecting device which comprises two clamping devices used for clamping the two ends of a tested core sample, each clamping device comprises a shell with a conical cavity and an arc-shaped clamping piece, a cross beam is installed at the large opening end of each shell, the center of each cross beam is located on the central axis of the corresponding conical cavity, and the arc-shaped clamping pieces are connected with the clamping devices. A connecting column matched with tensile test equipment is mounted at the central position of the cross beam; the arc-shaped clamping pieces are symmetrically arranged on the inner side of the conical cavity of the shell. The device is simple in structure, small in size, easy to install and flexible to adjust, the whole structure adopts an assembly type, lightweight and standardized design, test core samples of the same type can be commonly used, carrying is convenient, and assembling is easy and convenient.

Description

Technical Field

[0001] This utility model relates to indoor testing of concrete core samples, specifically to a connection device for ultimate tensile testing of concrete core samples. Background Technology

[0002] In the construction of reservoir dam projects, in order to check whether the interlayer bonding quality of the dam construction meets the design requirements, it is necessary to drill core samples of the dam concrete and conduct ultimate tensile tests on representative parts. At this time, a concrete core sample ultimate tensile test connection device will be used.

[0003] Traditional connection devices for ultimate tensile testing of concrete core samples mainly involve drilling holes at both ends of the core sample and then embedding bolts. However, the drilling process required for this device is difficult, the economic cost is high, and it is prone to eccentricity, resulting in insufficient accuracy of the collected data. Utility Model Content

[0004] The technical problem to be solved by this utility model is that, in view of the shortcomings of traditional concrete core sample ultimate tensile test connection devices, such as difficult hole making and high cost, and easy eccentricity, this utility model provides a concrete core sample ultimate tensile test connection device that is easy to install and can be reused.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A connection device for ultimate tensile testing of concrete core samples includes two clamping devices for holding both ends of the core sample being tested. Its structural features are as follows:

[0007] The clamping device includes a housing with a conical cavity and an arc-shaped clamping piece. A crossbeam is installed at the large end of the housing. The center of the crossbeam is located on the central axis of the conical cavity, and a connecting column for use with tensile testing equipment is installed at the center of the crossbeam.

[0008] The arc-shaped clips are symmetrically arranged inside the conical cavity of the housing.

[0009] Preferably, the connecting column is fitted with a hemispherical nut after passing through the crossbeam, and the arc-shaped surface of the hemispherical nut contacts the crossbeam.

[0010] Preferably, the contact surface of the test core sample of the arc-shaped clip is arranged with inverted triangular serrations.

[0011] Preferably, the inner slope ratio of the conical cavity is the same as the slope ratio of the shell contact surface of the arc-shaped clip.

[0012] Preferably, the connecting column is connected to the tensile testing equipment via a pin.

[0013] Preferably, the shell and crossbeam are made of 45 steel, and the HRC of the shell and crossbeam is 25-30.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) This utility model has a simple structure, small size, easy installation and flexible adjustment. The overall structure adopts a prefabricated, lightweight and standardized design. The maximum weight of a single component does not exceed 10Kg. Test components of the same type can be used interchangeably, which is convenient to transport and easy to assemble.

[0016] 2) This utility model is more convenient to operate, has lower economic costs, and provides more reliable test accuracy. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see Figure 1 An embodiment of the concrete core sample ultimate tensile connection device of this utility model includes two clamping devices for holding the two ends of the core sample 5 to be tested. Each clamping device includes a housing 1 with a conical cavity and arc-shaped clamping pieces 4. A crossbeam 2 is connected and installed at the larger end of the housing 1 via an M16 screw 7. The center of the crossbeam 2 is located on the central axis of the conical cavity, and a connecting column 3 for use with tensile testing equipment is installed at the center of the crossbeam 2. The arc-shaped clamping pieces 4 are symmetrically arranged inside the conical cavity of the housing 1.

[0023] Preferably, the connecting column 3 is fitted with a hemispherical nut 6 after passing through the crossbeam 2. The arc-shaped surface of the hemispherical nut 6 contacts the crossbeam 2, which can adjust the eccentricity.

[0024] Preferably, the contact surface of the test core sample 5 of the arc-shaped clamp 4 is arranged with inverted triangular serrations to make the clamping of the test core sample 5 more stable and reliable.

[0025] Preferably, the inner slope ratio of the conical cavity is the same as the slope ratio of the shell contact surface of the arc-shaped clip.

[0026] Preferably, the connecting column 3 is connected to the tensile testing equipment via a pin.

[0027] In this embodiment, the conical cavity has a large inner diameter of 230mm, a small inner diameter of 200mm, and a height of 110mm. Two M16 threaded holes are symmetrically provided on the large end face. The housing 1 is connected to the crossbeam 2 by two M16 screws 7. The inner slope of the conical cavity is 6.3, made of 45# steel, and requires heat treatment to HRC25-30. Its large and small opening dimensions are adjusted by enlarging or reducing them according to the tested core sample 5. The slope of the arc-shaped clamping plate 4 in contact with the housing is 6.3, and its arc radius is adjusted according to the tested core sample 5. The tooth width of the serrations on the arc-shaped clamping plate 4 is 4.5mm, and it requires heat treatment to HRC55-58. The crossbeam 2 is made of 45# steel, requires heat treatment to HRC25-30, and its dimensions are adjusted according to the housing 1.

[0028] When using this utility model, the housing of the clamping device is fitted onto both ends of the test core sample 5, and then an arc-shaped clamping piece 4 is inserted between the test core sample 5 and the housing 1. Finally, the device is connected to the tensile testing equipment through the connecting column 3 to carry out the test.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model should fall within the protection scope of the technical solution of this utility model.

Claims

1. A connection device for ultimate tensile testing of concrete core samples, comprising two clamping devices for holding both ends of the core sample to be tested, characterized in that: The clamping device includes a housing with a conical cavity and an arc-shaped clamping piece. A crossbeam is installed at the large end of the housing. The center of the crossbeam is located on the central axis of the conical cavity, and a connecting column for use with tensile testing equipment is installed at the center of the crossbeam. The arc-shaped clips are symmetrically arranged inside the conical cavity of the housing.

2. The connection device for the ultimate tensile test of concrete core samples according to claim 1, characterized in that, The connecting column passes through the crossbeam and is fitted with a hemispherical nut, and the arc-shaped surface of the hemispherical nut contacts the crossbeam.

3. The connection device for the ultimate tensile test of concrete core samples according to claim 1, characterized in that, The test core sample contact surface of the arc-shaped clip is arranged with inverted triangular serrations.

4. The connection device for the ultimate tensile test of concrete core samples according to any one of claims 1-3, characterized in that, The inner slope ratio of the conical cavity is the same as the slope ratio of the shell contact surface of the arc-shaped clip.

5. The connection device for the ultimate tensile test of concrete core samples according to any one of claims 1-3, characterized in that, The connecting column is connected to the tensile testing equipment via a pin.

6. The connection device for the ultimate tensile test of concrete core samples according to any one of claims 1-3, characterized in that, The shell and crossbeam are made of 45 steel, and the HRC of the shell and crossbeam is 25-30.

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