Variable-size frozen soil tensile capacity testing device

Abstract

The utility model discloses a variable-size frozen soil tensile capacity testing device. The variable-size frozen soil tensile capacity testing device comprises a soil sample box, an upper fastening device and a lower fastening device, wherein the upper fastening device is arranged on the top surface of the soil sample box; the lower fastening device is arranged on the bottom surface of the soil sample box; the variable-size frozen soil tensile capacity testing device is simple in structure and low in cost, and based on the defect that a soil sample deforms during freezing at present, the variable insertion block and the upper fastening device are additionally arranged, so that the variable-size frozen soil tensile capacity testing device creatively achieves the purpose of testing the tensile capacity of the frozen soil based on the defects of freezing and cooling modes at present. According to the device, accurate measurement of the tensile capacity of the soil body is creatively realized in a cooling mode that the sealed soil sample box is completely closed.

Description

Technical Field

[0001] The utility model relates to the field of frozen soil tensile capacity testing equipment, and particularly relates to a variable-size frozen soil tensile capacity testing device. Background Art

[0002] In traditional soil mechanics and engineering practice, due to the loose characteristics of soil, its tensile strength is much lower than its compressive and shear strengths. Therefore, the tensile strength of unfrozen soil is often ignored. For frozen soil, due to the freezing effect, the pore water inside the soil body changes into ice, and the originally loose soil particles are cemented by ice crystals, thus improving the tensile strength characteristics of the soil body. As an important parameter in the study of frozen soil mechanics, the tensile strength of frozen soil has wide applications in cold region engineering and artificial freezing construction. Therefore, designing a frozen soil tensile capacity testing device is of great significance for studying the development and variation law of the tensile strength of frozen soil. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a variable-size frozen soil tensile capacity testing device, which solves the problems mentioned in the background art.

[0004] The utility model is realized as follows: A variable-size frozen soil tensile capacity testing device, which includes: a soil sample box, an upper fastening device arranged on the top surface of the soil sample box, and a lower fastening device arranged on the bottom surface of the soil sample box; the interior is used to hold the soil sample. Two detachable molds are respectively arranged above and below the mold body. When testing the tensile strength of frozen soil with different cross-sectional sizes, the size of the soil sample box can be changed according to needs. According to the aspect ratio of the length and width of the cross-section to be pulled, it can be selected whether to install the detachable mold when filling the soil sample. In order to ensure the fastening strength, fastening screw holes and fastening bolts are provided to fix the detachable mold.

[0005] A further technical solution of the utility model is that the upper fastening device and the lower fastening device are detachably connected to the soil sample box. The sizes of the upper fastening device and the lower fastening device are slightly larger than those of the trapezoidal soil sample box. After the soil sample is loaded, during the freezing process, after tightening the screws with the screw holes on the upper and lower surfaces of the stainless steel inserts, frost heaving can be avoided, ensuring that the upper and lower surfaces of the soil sample are flush with the soil sample box during tension.

[0006] A further technical solution of the present utility model is as follows: The soil sample box includes: a first box body, a stainless steel insert block, and a second box body. The first box body and the second box body are respectively arranged at the left and right ends of the stainless steel insert block and are detachably connected to the stainless steel insert block. Since the designed test device is divided into a first box body and a second box body, and the first box body and the second box body are left and right symmetric structures, in order to ensure the tight combination of the soil sample box and the stainless steel insert block during the freezing process, during use, the insert block fixing bolts and the stainless steel screw holes are tightened to fasten the soil sample box and the upper and lower fastening devices respectively. During the specific test process, the tensile rod stretches the soil sample under the action of an external force until the soil sample is damaged.

[0007] A further technical solution of the present utility model is as follows: One end of the first box body is provided with a tensile rod, and the connection end of the first box body and the stainless steel insert block is provided with an insert block fixing bolt.

[0008] A further technical solution of the present utility model is as follows: The second box body has the same structure as the first box body.

[0009] A further technical solution of the present utility model is as follows: The first box body and the second box body are provided with a detachable mold.

[0010] A further technical solution of the present utility model is as follows: The first box body and the second box body are provided with fastening screw holes and fastening bolts for connecting the detachable mold.

[0011] A further technical solution of the present utility model is as follows: Both sides of the stainless steel insert block are provided with soil sample box screw holes for connecting the first box body and the second box body, and the top and bottom ends of the stainless steel insert block are both provided with jacks for connecting the upper fastening device and the lower fastening device; When filling the soil sample, the size of the stainless steel insert block can be changed according to the volume of the test soil sample. During the freezing process, the symmetric jacks are respectively combined with the upper and lower fastening devices, and the insert block fixing bolts and the soil sample box stainless steel screw holes can be tightened to achieve this.

[0012] The beneficial effects of the present utility model: The variable-size frozen soil tensile strength testing device of the present utility model has a simple structure and low cost. Based on the current deficiency that the soil sample will deform during freezing, this device innovatively realizes accurate measurement of the tensile strength of the soil body through a completely enclosed cooling method by adding variable inserts and upper fastening devices to overcome the deficiencies of the current freezing and cooling methods. Description of the Drawings

[0013] Figure 1 is the overall structural schematic diagram of a variable-size frozen soil tensile strength testing device provided by the present utility model;

[0014] Figure 2It is a schematic structural diagram of a soil sample box of a variable-size test device for the tensile capacity of frozen soil provided by the present utility model. Detailed implementation manners

[0015] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0016] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope that can be covered by the technical content disclosed in the present utility model without affecting the effects that the present utility model can produce and the purposes that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships should also be regarded as the scope under which the present utility model can be implemented without substantial change in technical content.

[0017] Example 1: Figure 1 - Figure 2A variable-size test device for the tensile capacity of frozen soil is shown. The variable-size test device for the tensile capacity of frozen soil includes: a soil sample box 1, an upper fastening device arranged on the top surface of the soil sample box 1, and a lower fastening device arranged on the bottom surface of the soil sample box 1; the upper fastening device and the lower fastening device are detachably connected to the soil sample box 1; the soil sample box 1 includes: a first box body, a stainless steel insert block 7, and a second box body. The first box body and the second box body are respectively arranged at the left and right ends of the stainless steel insert block 7 and are detachably connected to the stainless steel insert block 7; one end of the first box body is provided with a tensile rod 6, and an insert fixing bolt 5 is provided at the connection end of the first box body and the stainless steel insert block 7; the second box body has the same structure as the first box body; a detachable mold 2 is provided on the first box body and the second box body; fastening screw holes 3 and fastening bolts 4 for connecting the detachable mold 2 are provided on the first box body and the second box body; soil sample box screw holes for connecting the first box body and the second box body are provided on both sides of the stainless steel insert block 7, and jacks 8 for connecting the upper fastening device and the lower fastening device are provided at the top and bottom of the stainless steel insert block 7; the variable-size test device for the tensile capacity of frozen soil of the present invention has a simple structure and low cost. Based on the current deficiency that the soil sample will deform during freezing, this device innovatively realizes the accurate measurement of the tensile capacity of the soil body through a completely enclosed cooling method by sealing the soil sample box, addressing the deficiencies of the current freezing and cooling methods by adding variable inserts and an upper fastening device.

[0018] Soil sample box: It is used to hold the soil sample inside. Two detachable molds 2 are respectively provided above and below the main body of the mold. When testing the tensile strength of frozen soil with different cross-sectional sizes, the size of the soil sample box can be changed as needed. According to the aspect ratio of the length and width of the cross-section to be pulled, whether to install the detachable mold 2 can be selected when filling the soil sample. To ensure the fastening strength, fastening screw holes 3 and fastening bolts 4 are provided to fix the detachable mold 2. Since the designed test device is divided into a first box body and a second box body, and the first box body and the second box body have a left-right symmetric structure, to ensure the tight combination of the soil sample box and the stainless steel insert block 7 during the freezing process, the insert fixing bolt 5 and the stainless steel screw hole 9 are tightened during use to fasten the soil sample box and the upper and lower fastening devices respectively. During the specific test process, the tensile rod 6 stretches the soil sample under the action of an external force until the soil sample is damaged.

[0019] Upper and lower fastening devices: Their sizes are slightly larger than the trapezoidal soil sample box. After loading the soil sample, when the screws are tightened with the screw holes 8 on the upper and lower surfaces of the stainless steel insert block during the freezing process, frost heaving can be avoided, ensuring that the upper and lower surfaces of the soil sample are flush with the soil sample box during stretching.

[0020] Stainless steel insert block: When filling the soil sample, the size of the insert block 7 can be changed according to the volume of the test soil sample. During the freezing process, the symmetrically arranged jacks 8 are respectively combined with the upper and lower fastening devices, and this can be achieved by tightening the insert block fixing bolts 5 and the stainless steel screw holes 9 of the soil sample box.

[0021] The purpose of the device of the present invention is to measure the tensile strength of frozen soil. At the beginning of the test, the soil sample box 1 and the lower fastening device are installed, and then the prepared soil sample is spread flat in the soil sample box 1. Whether to add the detachable mold 2 and select the stainless steel insert block 7 with a suitable volume size is determined according to the volume of the test soil sample. After the height of the soil sample is flush with the soil sample box, the symmetrically arranged jacks 8 are respectively combined with the upper and lower fastening devices, and the insert block fixing bolts 5 and the stainless steel screw holes 9 of the soil sample box 1 are tightened, and then it is placed in a specified temperature for freezing for a certain period of time. After the soil sample is frozen, the upper and lower fastening devices and the stainless steel insert block 7 are disassembled from the soil sample box 1 with the detachable mold 2 added, and then the left and right parts of the soil sample box are connected with bolts. The tensile rod of the connected soil sample box is connected to the tensile testing machine, and an external force is applied on the tensile rod 6, and it is stretched outwards under the action of the external force until the soil sample is damaged. Based on the current deficiency that the soil sample will deform during freezing, the device realizes the accurate measurement of the tensile capacity of the soil body through the innovative way of adding variable insert blocks and upper fastening devices and the innovative way of completely sealing the soil sample box for cooling.

[0022] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A test device for the tensile capacity of frozen soil with variable dimensions, characterized in that, The variable-size tensile capacity testing device for frozen soil includes: a soil sample box (1), an upper fastening device provided on the top surface of the soil sample box (1), and a lower fastening device provided on the bottom surface of the soil sample box (1).

2. The variable-size test device for tensile capacity of frozen soil according to claim 1, wherein The upper fastening device and the lower fastening device are detachably connected to the soil sample box (1).

3. A test device for the tensile capacity of frozen soil with variable dimensions according to claim 1, characterized in that, The soil sample box (1) includes: a first box body, a stainless steel insert block (7), and a second box body. The first box body and the second box body are respectively arranged at the left and right ends of the stainless steel insert block (7) and are detachably connected to the stainless steel insert block (7).

4. A variable-size test device for the tensile capacity of frozen soil according to claim 3, characterized in that One end of the first box body is provided with a tensile rod (6), and the connection end of the first box body and the stainless steel insert block (7) is provided with an insert block fixing bolt (5).

5. A test device for the tensile capacity of frozen soil with variable dimensions according to claim 4, characterized in that, The second box body has the same structure as the first box body.

6. The variable-size test device for tensile capacity of frozen soil according to claim 5, characterized in that, Detachable molds (2) are provided on the first box body and the second box body.

7. A variable-size test device for the tensile capacity of frozen soil according to claim 6, characterized in that, Fastening screw holes (3) and fastening bolts (4) for connecting the detachable molds (2) are provided on the first box body and the second box body.

8. A variable-size test device for the tensile capacity of frozen soil according to claim 7, characterized in that, Soil sample box screw holes for connecting the first box body and the second box body are provided on both sides of the stainless steel insert block (7), and insertion holes (8) for connecting the upper fastening device and the lower fastening device are provided at the top and bottom ends of the stainless steel insert block (7).

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