Device for preparing and maintaining solidified sludge soil sample

Abstract

The utility model relates to the technical field of soil tests, in particular to a device for preparing and maintaining a solidified sludge soil sample, which comprises a two-section mold, an upper sleeve shell, a lower sleeve shell, an electromagnetic heating coil, an electromagnetic heating controller, an infrared temperature measuring probe, an upper sound wave probe, a lower sound wave probe, an ultrasonic pulse transmitting and receiving instrument and a main control power switch, the mold device can solve the problems of an existing mold device in the solidified sludge soil sample preparation and maintenance stage, and has the advantages of being simple in structure and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of soil test, concretely to a device for curing muck sample preparation and maintenance. BACKGROUND

[0002] In the engineering construction of municipal roads, river regulation, coastal area development, etc., a large amount of muck soil is often encountered, which exhibits typical characteristics of high water content, low bearing capacity and high compressibility, and needs to be treated by solidification to realize resource utilization. At present, low-carbon cementitious materials such as fly ash, coal gangue powder and calcium carbide slag can be used in engineering to chemically solidify muck soil and change it into solidified muck soil to significantly improve the mechanical parameters of the soil body. Taking a cylindrical sample as an example, the preparation and curing process of the solidified muck soil sample in the laboratory experiment is as follows: first, the cementitious material is added to the muck soil and mixed; second, the mixed material is poured into a cylindrical mold; third, the mold is removed after the mixed material solidifies; finally, the solidified muck soil sample is placed in a constant temperature environment box at the required temperature for curing. Due to the high water content of the muck soil and the high compressibility of the soil body itself, the solidified muck soil sample has the following limitations during preparation and curing:

[0003] (1) During the preparation of the solidified muck soil sample, the high water content causes the mixed material to be in a fluid state, resulting in a large difference in density at different heights of the sample, and generally the higher the density, the lower the density. Therefore, during the solidification process, the upper part of the sample solidifies slowly, resulting in the formation of an over-solidified or under-solidified region inside the sample, affecting the homogeneity of the sample.

[0004] (2) During the curing process of the solidified muck soil sample, the sample is placed in a constant temperature environment box, which cannot achieve the purpose of controlling the curing temperature of the solidified muck soil sample at different heights. However, in actual engineering, the temperature at which the solidified muck soil at different depths is subjected to curing is different, i.e. there is a temperature difference, resulting in a discrepancy between the laboratory curing environment and the actual engineering.

[0005] (3) During the solidification (including preparation and curing) of the solidified muck soil sample, if the longitudinal wave velocity of the sample at different stages is to be tested, the sample needs to be constantly taken out of the constant temperature environment box and tested using an ultrasonic testing system, which will change the curing environment of the sample and easily cause damage to the sample during the operation process.

[0006] Therefore, it is necessary to design a device for solidified muck soil sample preparation and curing to solve the above problems. UTILITY MODEL CONTENTS

[0007] The purpose of this invention is to design a device for the preparation and curing of solidified silt samples, in order to solve a series of problems existing in the preparation and curing stages of solidified silt samples using current devices. It features a simple structure and convenient operation.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An apparatus for preparing and curing solidified silt samples comprises a two-part mold, an upper shell, a lower shell, an electromagnetic heating coil, an electromagnetic heating controller, an infrared temperature probe, an upper acoustic probe, a lower acoustic probe, an ultrasonic pulse transmitter and receiver, and a main control power switch. The system comprises a two-part mold, an upper shell, and a lower shell, forming a split-type three-cavity molding mold system. In this system, the two-part molds are symmetrically distributed axially, and the upper and lower shells are radially pressed onto the top and bottom of the two-part molds, respectively. An electromagnetic heating system consists of an electromagnetic heating coil, an electromagnetic heating controller, and infrared temperature probes. In this system, four electromagnetic heating coils are equidistantly distributed along the height of the two-part mold, and the output of each coil is connected to the corresponding electromagnetic heating controller on the right. Each electromagnetic heating controller has three vertically evenly distributed infrared temperature probes on its left side. An ultrasonic monitoring system comprises an upper acoustic probe, a lower acoustic probe, an ultrasonic pulse transmitter and receiver, and a main control power switch. In this system, the upper acoustic probe is located at the top of the two-part mold on the upper shell, and the lower acoustic probe is located at the bottom of the two-part mold on the lower shell. The ultrasonic pulse transmitter and receiver are electrically connected to the upper and lower acoustic probes, respectively. The main control power switch is fixedly installed on the upper panel of the ultrasonic pulse transmitter and receiver.

[0010] Furthermore, the two-part mold, the upper shell, and the lower shell are all made of stainless steel; the electromagnetic heating coil uses high-temperature resistant copper wire.

[0011] The beneficial effects of this utility model are as follows:

[0012] (1) By using an electromagnetic heating system, different temperatures can be achieved at different heights of the mold, and the temperature distribution pattern at different heights of the mold can be monitored. Based on this, the temperature field at different heights can be adjusted to achieve the following two objectives: First, during the preparation of solidified silt samples, the solidification speed of this part of the sample can be accelerated by increasing the temperature at the upper part of the mold, thereby reducing the non-uniformity of the sample; Second, during the curing of solidified silt samples, different curing temperature fields can be achieved according to different working conditions, so that the curing conditions of the sample are more consistent with the actual engineering.

[0013] (2) By using an ultrasonic monitoring system, the longitudinal wave velocity of the solidified silt sample during the solidification stage can be monitored in real time without touching the sample. The degree of solidification and the variation of other physical and mechanical parameters of the sample can be analyzed by the change of the longitudinal wave velocity of the sample. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the relevant drawings involved in the embodiments or the prior art will be described in detail below.

[0015] Fig. 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0016] Fig. 2 This is a schematic diagram of the split three-cavity molding die system in the device of this utility model;

[0017] Fig. 3 This is a schematic diagram of the electromagnetic heating system in the device of this utility model;

[0018] The numbers in the diagram are as follows: 1-Two-lobed mold, 2-Upper shell, 3-Lower shell, 4-Electromagnetic heating coil, 5-Electromagnetic heating controller, 6-Infrared temperature probe, 7-Upper acoustic probe, 8-Lower acoustic probe, 9-Ultrasonic pulse transmitter and receiver, 10-Main control power switch. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] like Figs. 1-3As shown, an apparatus for preparing and curing solidified silt samples comprises a two-part mold 1, an upper shell 2, a lower shell 3, an electromagnetic heating coil 4, an electromagnetic heating controller 5, an infrared temperature probe 6, an upper acoustic wave probe 7, a lower acoustic wave probe 8, an ultrasonic pulse transmitter and receiver 9, and a main control power switch 10. The two-part mold 1, upper shell 2, and lower shell 3 form a split-type three-cavity molding mold system. In this system, the two-part mold 1 is symmetrically distributed along the axial direction, and the upper shell 2 and lower shell 3 are radially pressed onto the top and bottom ends of the two-part mold 1, respectively. The electromagnetic heating coil 4, electromagnetic heating controller 5, and infrared temperature probe 6 form an electromagnetic heating system. In this system, four electromagnetic heating coils 4 are equidistantly distributed along the height direction of the two-part mold 1, generating eddy current heat within the wall of the two-part mold 1 through electromagnetic induction, achieving non-contact heating. Furthermore, the output terminals of each electromagnetic heating coil 4 are connected to the corresponding electromagnetic heating controller 5 on the right end to adjust the working power of the electromagnetic heating coil 4 in real time. In addition, each electromagnetic heating controller 5 has three infrared temperature probes 6 evenly distributed vertically on the left side for non-contact measurement of the surface temperature of the two-lobed mold 1. The upper acoustic wave probe 7, the lower acoustic wave probe 8, the ultrasonic pulse transmitter and receiver 9, and the main control power switch 10 constitute an ultrasonic monitoring system. In the ultrasonic monitoring system, the upper acoustic wave probe 7 is located at the top of the upper shell 2 of the two-lobed mold 1 to emit ultrasonic pulse waves, and the lower acoustic wave probe 8 is located at the bottom of the lower shell 3 of the two-lobed mold 1 to collect the ultrasonic signal after attenuation of the solidified silt sample. The ultrasonic pulse transmitter and receiver 9 is connected to the upper acoustic wave probe 7 and the lower acoustic wave probe 8 by electrical signals. The main control power switch 10 is fixedly installed on the upper panel of the ultrasonic pulse transmitter and receiver 9.

[0022] The specific operating steps of the device are as follows, wherein the first and second steps are the solidification silt sample preparation stage, and the third step is the solidification silt sample curing stage:

[0023] The first step is to symmetrically assemble the two halves of the mold 1 along the axial direction to form a cylindrical mold cavity. After ensuring that the upper and lower end faces are flat, the lower sleeve 3 is aligned with the bottom of the two halves of the mold 1 and pressed together. Silt and curing agent are added in sequence and stirred evenly. Then, the upper sleeve 2 is pressed vertically along the radial direction to the top of the two halves of the mold 1 to form a sealed split three-cavity molding mold system. Then, the upper acoustic probe 7, the lower acoustic probe 8, the ultrasonic pulse transmitter and receiver 9, and the main control power switch 10 are installed in sequence to form an ultrasonic monitoring system.

[0024] Step 2: Activate the electromagnetic heating system. First, start the electromagnetic heating controller 5. The four electromagnetic heating coils 4, equidistantly distributed along the height of the two-part mold 1, begin working. Eddy current heat is generated within the wall of the two-part mold 1 through electromagnetic induction, achieving non-contact heating. The surface temperature of the two-part mold 1 is monitored in real time by an infrared temperature probe 6 installed on the left side. Simultaneously, turn on the main control power switch 10, and the ultrasonic monitoring system starts working. The upper acoustic wave probe 7 emits ultrasonic pulse waves, which penetrate the solidified silt sample and are received by the lower acoustic wave probe 8. The ultrasonic pulse transmitter and receiver 9 analyzes the ultrasonic parameters and provides real-time feedback on the changes in the longitudinal wave velocity inside the solidified silt sample, thereby deducing the degree of solidification of the sample. Based on this, the electromagnetic heating controller 5 further dynamically adjusts the working power of each corresponding electromagnetic heating coil 4 to accelerate the solidification speed of the upper part of the sample.

[0025] Step 3: According to the curing requirements of different working conditions, the temperature of the mold at different heights is monitored in real time using an infrared temperature probe 6, and then adjusted to achieve different temperature distributions at different heights of the sample until the working conditions are met. At the same time, the change of longitudinal wave velocity inside the solidified silt sample is tested in real time using an ultrasonic monitoring system to monitor the longitudinal wave velocity of the solidified silt sample in the solidification stage. Thus, the degree of solidification and the change law of other physical and mechanical parameters of the sample can be analyzed by the change of longitudinal wave velocity.

[0026] The main features and advantages of this utility model have been described in detail above. Based on the above description, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for curing and maintaining a sample of silt soil, comprising two halves of a mold mold (1), an upper sleeve (2), a lower sleeve (3), an electromagnetic heating coil (4), an electromagnetic heating controller (5), an infrared temperature measuring probe (6), an upper acoustic wave probe (7), a lower acoustic wave probe (8), an ultrasonic pulse emission and reception instrument (9), and a main control power switch (10), characterized in that: Two halves of the mold mold (1), the upper shell (2) and the lower shell (3) constitute a split three cavity forming mold system, in the split three cavity forming mold system, two halves of the mold mold (1) is distributed along the axial symmetry, the upper shell (2) and the lower shell (3) are respectively compressed in the top end and the bottom end of two halves of the mold mold (1) along the radial direction;Electromagnetic heating coil (4), electromagnetic heating controller (5), infrared temperature measurement probe (6) constitute electromagnetic heating system, in the electromagnetic heating system, four electromagnetic heating coils (4) are arranged equidistantly along the height direction of two halves of the mold mold (1), and the output end of each electromagnetic heating coil (4) is connected with the corresponding electromagnetic heating controller (5) at the right end, and the left end side of each electromagnetic heating controller (5) is provided with three infrared temperature measurement probes (6) which are uniformly distributed along the vertical direction;The upper acoustic probe (7), the lower acoustic probe (8), the ultrasonic pulse emission receiver (9) and the main control power switch (10) constitute an ultrasonic monitoring system, in the ultrasonic monitoring system, the upper acoustic probe (7) is located at the top of the two halves of the mold mold (1) upper shell (2), the lower acoustic probe (8) is located at the bottom of the two halves of the mold mold (1) lower shell (3), the ultrasonic pulse emission receiver (9) is connected with the upper acoustic probe (7) and the lower acoustic probe (8) through electric signal respectively, and the main control power switch (10) is fixedly installed on the upper panel of the ultrasonic pulse emission receiver (9).

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