Auxiliary device for testing bending-tensile elastic modulus of cement concrete

Abstract

The utility model provides a cement concrete flexural-tensile elastic modulus test auxiliary device, which comprises a bottom plate and a sheath installed at the edge of the bottom plate, a hollow groove is arranged at the center line position of the bottom plate, the hollow groove is parallel to the long side of the bottom plate, a fulcrum groove is arranged at the axis position of the bottom plate, and the fulcrum groove is parallel to the long side of the bottom plate. Three square positioning grooves are further formed in the bottom plate and used for installing a dial indicator support, two positioning grooves are formed in the left side of the fulcrum groove and distributed in the left side and the right side of the hollowed-out groove with the hollowed-out groove as the axis, and the other positioning groove is located on the hollowed-out groove and located on the right side of the fulcrum groove. The device is simple in structure and convenient to operate, and can quickly and accurately draw a center line and four foot points of the dial gauge stand on a test block, so that the line drawing work of a cement concrete bending-tensile elastic modulus test becomes simple and quick, the deviation caused by manual line drawing depending on a steel ruler is avoided, and the working efficiency is improved while the accuracy of a test result is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering testing technology, specifically relating to an auxiliary device for testing the flexural elastic modulus of cement concrete. Background Technology

[0002] In recent years, with the rapid development of my country's economic construction, road projects have also increased. Cement concrete, as a traditional building material, plays an important role in road construction. Although in recent years, with the development of technology and the emergence of new materials, some regions and specific occasions may choose other materials, cement concrete pavement is still widely used globally due to its durability, cost-effectiveness, and relatively simple construction process. Cement concrete pavement remains the first choice for infrastructure construction.

[0003] The flexural tensile modulus test of cement concrete is one of the important testing methods for cement concrete pavement. It is currently widely used in cement concrete pavement testing, which not only provides important basis for road engineering design, but also provides important guarantee for the quality of road engineering.

[0004] According to the "Test Procedures for Cement and Cement Concrete in Highway Engineering" (JTG 3420-2020) T 0559-2005 Test Method for Flexural Tensile Elastic Modulus of Cement Concrete, the center line and the positions of the four feet of the dial indicator holder need to be marked on both sides of the test block for pasting (1 cm² area). 2 The test involves using small glass slides, accurate to 1 mm. This test procedure is quite cumbersome and time-consuming. Furthermore, using a steel ruler to mark the center line and the positions of the four feet of the dial indicator stand makes it easy for deviations to occur during the marking process, failing to meet the requirement of accuracy to 1 mm and resulting in inaccurate test results. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete. This device can solve the problem of inaccurate test results caused by inaccurate marking on the surface of the test block, and can also improve the test speed, making the flexural tensile modulus of elasticity test of cement concrete faster and more accurate.

[0006] The technical solution adopted in this utility model is as follows:

[0007] An auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete includes a base plate and a protective sleeve installed on the edge of the base plate. A hollow groove is opened at the center line of the base plate, and the hollow groove is parallel to the long side of the base plate. A fulcrum groove is opened at the axial center of the base plate. Three square positioning grooves are also opened on the base plate for installing a dial indicator bracket. Two of the positioning grooves are located to the left of the fulcrum groove and are distributed on the left and right sides of the hollow groove with the hollow groove as the axis. The third positioning groove is located on the hollow groove and to the right of the fulcrum groove.

[0008] Furthermore, the sheath includes a protective plate vertically welded to the short side of the base plate and a side plate bent in the direction of the long side. The side plate is welded to the long side of the base plate. There are two sets of sheaths, and the two sets of sheaths form a frame structure.

[0009] Furthermore, the hollowed-out groove has a multi-segment structure, and both ends of the hollowed-out groove are connected to the short side of the base plate.

[0010] Furthermore, the sheath is made of two square steel plates welded at 90 degrees. There are four sets of sheaths, which are welded to the outer walls of the four corners of the base plate, forming a frame structure.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] This invention has a simple structure and is easy to operate. It can quickly and accurately draw the center line and four feet of the dial gauge holder on the test block, making the line drawing work of the flexural tensile elastic modulus test of cement concrete simple and quick, avoiding the deviation that occurs when drawing lines manually with a steel ruler, and improving work efficiency while ensuring the accuracy of test results. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention;

[0014] Appendix Figure 2 This is a structural schematic diagram of the second embodiment of the present invention. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0016] Example 1: As Figure 1As shown, an auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete includes a base plate 1 and a protective sleeve 2 installed on the edge of the base plate 1. The base plate 1 is made of stainless steel. In this invention, the dimensions of the base plate 1 are 550mm * 150mm * 2mm, meaning this auxiliary device is specifically designed for 550mm * 150mm * 2mm concrete. For use with 150mm diameter cement concrete test blocks, a hollow groove 11 is cut at the center line of the base plate 1, parallel to the long side of the base plate 1, and is used to draw the center line on the surface of the cement concrete test block. A fulcrum groove 12 is cut at the axial center of the base plate 1. The fulcrum groove 12 is a square structure and is used to support a dial indicator. Three square positioning grooves 13 are also cut on the base plate 1. The positioning grooves 13 are used to install the dial indicator bracket. The positioning grooves 13 are 10mm*10mm in size. Two of the positioning grooves 13 are located to the left of the fulcrum groove 12 and are distributed on the left and right sides of the hollow groove 11 with the hollow groove 11 as the axis. The third positioning groove 13 is located on the hollow groove 11 and to the right of the fulcrum groove 12. That is, the three positioning grooves 13 form an isosceles triangle structure.

[0017] The sheath 2 includes a sheath 21 vertically welded to the short side of the base plate 1 and a side plate 22 bent in the direction of the long side. The side plate 22 is welded to the long side of the base plate 1. There are two sets of sheaths 2, and the two sets of sheaths 2 form a frame structure. This frame structure can be just embedded in the cement concrete test block. Another function of the sheath 2 is to fix the base plate 1 into an integral structure after the hollow groove 11 is opened on the base plate 1.

[0018] Example 2: As Figure 2 As shown, a discontinuous perforated groove 11 is opened at the center line of the base plate 1. The perforated groove 11 is parallel to the long side of the base plate 1 and is composed of multiple long strip-shaped grooves. The two ends of the perforated groove 11 are connected to the short side of the base plate 1. The use of a discontinuous perforated groove 11 prevents the base plate 1 from being divided into two parts. When drawing the center line, the multiple line segments drawn in the perforated groove 11 can be connected. Based on the above structure, the sheath 2 is composed of two square steel plates 23 welded at 90 degrees. There are four sets of sheath 2. The four sets of sheath 2 are welded to the outer walls of the four corners of the base plate 1, and the four sets of sheath 2 form a frame structure. This frame structure can just fit the cement concrete test block.

[0019] The method of using this utility model is as follows:

[0020] Before the test begins, the auxiliary device is placed on the surface of the test block. The center line of the test block is drawn in the hollow groove 11 of the device with a pencil. Then, the three feet of the dial indicator stand are drawn in the three hollow positioning grooves 13. The feet of the dial indicator are drawn in the support groove 12. After drawing, the auxiliary device can be removed. Since the test blocks are all of standard specifications, the center line and the supporting feet drawn by the auxiliary device meet the requirement of accuracy to 1mm.

[0021] This utility model has a simple structure and can quickly and accurately draw the center line and four feet of the dial indicator stand. It is simple and convenient to operate, and avoids the deviation that occurs when drawing lines by hand with a steel ruler, thus ensuring the accuracy of the flexural tensile modulus of elasticity test of cement concrete.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete, comprising a base plate and a protective sleeve installed on the edge of the base plate, characterized in that: A perforated groove is cut along the center line of the base plate, parallel to the long side of the base plate. A fulcrum groove is cut at the axial center of the base plate. Three square positioning grooves are also cut on the base plate. The positioning grooves are used to install the dial indicator bracket. Two of the positioning grooves are located to the left of the fulcrum groove and are distributed on the left and right sides of the perforated groove with the perforated groove as the axis. The other positioning groove is located on the perforated groove and to the right of the fulcrum groove.

2. The auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete according to claim 1, characterized in that: The sheath includes a protective plate vertically welded to the short side of the base plate and a side plate bent in the direction of the long side. The side plate is welded to the long side of the base plate. There are two sets of sheaths, and the two sets of sheaths form a frame structure.

3. The auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete according to claim 1, characterized in that: The hollowed-out groove has a multi-segment structure, and both ends of the hollowed-out groove are connected to the short side of the base plate.

4. The auxiliary device for testing the flexural tensile modulus of elasticity of cement concrete according to claim 1, characterized in that: The sheath is made of two square steel plates welded at 90 degrees. There are four sets of sheaths, which are welded to the outer walls of the four corners of the base plate, forming a frame structure.

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