Roadbed compactness detection equipment

Abstract

The utility model discloses roadbed compactness detection equipment which comprises a probe shell, a connecting rod is fixedly assembled at the upper end of the probe shell, a pressure sensor in a detection head structure is positioned at the front end inside a conical head shell, a novel capacitive sensor is adopted, and an induction pole plate is tightly attached to the inner wall of the conical head shell. The attaching mode can effectively reduce the influence of external interference on sensor measurement, the depth sensor is located at the position, close to the middle, in the probe shell, the depth sensor is an ultrasonic sensor, the depth sensor is used for accurately detecting the depth of the portion, inserted into a roadbed, of the probe structure, and a basis is provided for accurate calculation of the compactness. The heating structure is located at the rear end of the probe shell and connected with the connecting rod, and the heating structure is used for heating soil around the probe in cold weather or when the soil humidity is large, so that the physical property of the soil is more stable, and the detection accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the field of roadbed compaction testing technology, specifically to a roadbed compaction testing device. Background Technology

[0002] The compaction degree of the subgrade directly affects its bearing capacity. When the subgrade soil is compacted to a suitable degree, the gaps between soil particles decrease, and the soil particles move closer together to form a more stable structure. For sandy subgrades, compaction can make the sand particles closely arranged, increasing the friction between particles, thereby improving the subgrade's ability to resist the shear force generated by vehicle loads. In road construction, the subgrade compaction degree is one of the key indicators for measuring the quality of subgrade construction. Traditional subgrade compaction degree testing equipment is greatly affected by weather conditions, and the testing results are inaccurate due to the installation method. Utility Model Content

[0003] The purpose of this invention is to provide a roadbed compaction testing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a roadbed compaction testing device, comprising a probe housing, a connecting rod fixedly mounted on the upper end of the probe housing, the connecting rod being connected to the main body of the compaction testing device, a heating structure fixedly mounted on the lower end of the connecting rod, the heating structure being sleeved on the outer wall of the probe housing, a depth sensor fixedly mounted in the middle of the inner wall of the probe housing, the probe of the depth sensor penetrating the probe housing and mounted on its outer wall, and a detection head structure screwed to the lower end of the inner wall of the probe housing.

[0005] Preferably, the heating structure includes a protective sleeve, which is fixedly mounted on the lower end of the connecting rod. A resistance heating wire is installed through the inner wall of the protective sleeve, and the resistance heating wire is sleeved on the outer wall of the probe housing. A diffuser is fixedly mounted on the lower end of the protective sleeve.

[0006] Preferably, the detection head structure includes a cone cylinder screwed to the inner wall of the probe housing. A support ring is fixedly fitted to the lower end of the inner wall of the cone cylinder. A pressure sensor is inserted through the inner wall of the support ring. A retaining ring is fixedly fitted to the outer wall of the pressure sensor and is engaged with the upper surface of the support ring. A retaining plate is fixedly fitted to the outer wall of the pressure sensor. A spring is fitted to the outer wall of the pressure sensor. One end of the spring is fixedly connected to the retaining plate, and the other end of the spring is fixedly connected to the support ring. A cone head is fixedly fitted to the lower end of the outer wall of the pressure sensor.

[0007] Preferably, the inner wall of the probe housing has a heat insulation plate fixed to the turntable, and the heat insulation plate is located at the upper end of the depth sensor.

[0008] Preferably, the upper end of the outer wall of the pressure sensor is threaded, and the inner wall of the support ring is threaded, and the upper end of the pressure sensor is screwed to the inner wall of the support ring.

[0009] Compared with existing technologies, the advantages of this utility model are as follows: The probe shell is a cylindrical structure made of high-strength, corrosion-resistant metal material. The detection head structure at its front end is conical, which facilitates insertion into the roadbed soil. The pressure sensor in the detection head structure is located at the front end inside the conical shell. It adopts a new type of capacitive sensor, and the sensing plate is tightly attached to the inner wall of the conical shell. This attachment method can effectively reduce the influence of external interference on the sensor measurement. The depth sensor is located near the middle inside the probe shell. The depth sensor is an ultrasonic sensor. The function of the depth sensor is to accurately detect the depth of the probe structure inserted into the roadbed, providing a basis for accurate calculation of compaction. The heating structure is located at the rear end of the probe shell and connected to the connecting rod. The function of the heating structure is to heat the soil around the probe in cold weather or when the soil moisture is high, making the physical properties of the soil more stable, thereby improving the accuracy of the detection. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0011] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0012] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0013] In the diagram: 1-Probe housing, 2-Connecting rod, 3-Heating structure, 31-Cylinder, 32-Resistance heating wire, 33-Diffuser tube, 4-Detection head structure, 41-Conical tube, 42-Support ring, 43-Pressure sensor, 44-Clamping plate, 45-Spring, 46-Conical head, 5-Depth sensor, 6-Heat insulation plate. Detailed Implementation

[0014] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3This utility model provides a roadbed compaction testing device, including a probe housing 1, a connecting rod 2 fixedly mounted on the upper end of the probe housing 1, the connecting rod 2 being connected to the main body of the compaction testing device, a heating structure 3 fixedly mounted on the lower end of the connecting rod 2, the heating structure 3 being sleeved on the outer wall of the probe housing 1, a depth sensor 5 fixedly mounted in the middle of the inner wall of the probe housing 1, the probe of the depth sensor 5 penetrating the probe housing 1 and mounted on its outer wall, and a detection head structure 4 screwed to the lower end of the inner wall of the probe housing 1.

[0016] The probe housing 1 is a cylindrical structure made of high-strength, corrosion-resistant metal. The detection head structure 4 at its front end is conical, facilitating insertion into the roadbed soil. The pressure sensor 43 within the detection head structure 4 is located at the front end inside the conical head 46 housing. It employs a novel capacitive sensor, with its sensing plate tightly fitted to the inner wall of the conical head 46 housing. This fitting effectively reduces the impact of external interference on sensor measurements. The depth sensor 5 is located near the center inside the probe housing 1, with its probe fixed to the outer wall of the housing. The depth sensor 5 is an ultrasonic sensor, its function being to accurately detect the insertion depth of the detection head structure 4 into the roadbed, providing a basis for accurate compaction calculations. The heating structure 3 is located at the rear end of the probe housing 1 and connected to the connecting rod 2. The heating structure 3 heats the soil around the probe in cold weather or when soil moisture is high, stabilizing the soil's physical properties and improving detection accuracy.

[0017] The heating structure 3 includes a protective sleeve 31, which is fixedly mounted on the lower end of the connecting rod 2. A resistance heating wire 32 is installed through the inner wall of the protective sleeve 31. The resistance heating wire 32 is sleeved on the outer wall of the probe housing 1. A diffuser tube 33 is fixedly mounted on the lower end of the protective sleeve 31.

[0018] In cold weather or when the soil is damp, the resistance heating wire 32 is turned on, and the heat is concentrated on the inner wall of the protective tube 31. The heat is then diffused downwards through the diffuser tube 33 at the lower end, ensuring a good heating effect on the surrounding environment.

[0019] The detection head structure 4 includes a cone 41, which is screwed to the inner wall of the probe housing 1. A support ring 42 is fixedly mounted on the lower end of the inner wall of the cone 41. A pressure sensor 43 is inserted through the inner wall of the support ring 42. A retaining ring is fixedly mounted on the outer wall of the pressure sensor 43 and is engaged with the upper surface of the support ring 42. A retaining plate 44 is fixedly mounted on the outer wall of the pressure sensor 43. A spring 45 is fitted on the outer wall of the pressure sensor 43. One end of the spring 45 is fixedly connected to the retaining plate 44, and the other end of the spring 45 is fixedly connected to the support ring 42. A cone head 46 is fixedly mounted on the lower end of the outer wall of the pressure sensor 43.

[0020] The cone 41 is screwed to the probe housing 1, allowing for disassembly and maintenance of the internal pressure sensor 43 as needed. The outer wall of the pressure sensor 43 is tightly fitted with a cone head 46, ensuring smooth insertion of the device. Simultaneously, the sensing plate of the pressure sensor 43 is tightly fitted to the inner wall of the cone head 46's housing. This fitting method effectively reduces the impact of external interference on sensor measurements. When inserted into the soil, it provides a buffering effect, preventing soil pressure from damaging the cone head 46. At this time, the cone head 46, through the pressure sensor 43, drives the clamping plate 44 to shift and compresses the spring 45 to achieve a damping effect. The pressure sensor 43 shifts within the support ring 42, ensuring stability.

[0021] The inner wall of the probe housing 1 has a fixed turntable with a heat insulation plate 6, which is located at the upper end of the depth sensor 5.

[0022] The heat insulation plate 6 serves to protect the depth sensor 5.

[0023] The upper end of the outer wall of the pressure sensor 43 is threaded, and the inner wall of the support ring 42 is threaded. The upper end of the pressure sensor 43 is screwed to the inner wall of the support ring 42.

[0024] By screwing the upper end of the pressure sensor 43 to the inner wall of the support ring 42, the cone head can be fixed and will not vibrate when inserted into the soil, ensuring that the equipment has a wide range of applications.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roadbed compaction testing device, characterized in that: The device includes a probe housing (1), a connecting rod (2) fixedly mounted on the upper end of the probe housing (1), the connecting rod (2) being connected to the main body of the compaction testing equipment, a heating structure (3) fixedly mounted on the lower end of the connecting rod (2), the heating structure (3) being sleeved on the outer wall of the probe housing (1), a depth sensor (5) fixedly mounted on the middle of the inner wall of the probe housing (1), the probe of the depth sensor (5) penetrating the probe housing (1) and mounted on its outer wall, and a detection head structure (4) screwed to the lower end of the inner wall of the probe housing (1).

2. The roadbed compaction testing device according to claim 1, characterized in that: The heating structure (3) includes a protective sleeve (31), which is fixedly mounted on the lower end of the connecting rod (2). A resistance heating wire (32) is installed through the inner wall of the protective sleeve (31), and the resistance heating wire (32) is sleeved on the outer wall of the probe housing (1). A diffuser (33) is fixedly mounted on the lower end of the protective sleeve (31).

3. The roadbed compaction testing device according to claim 1, characterized in that: The detection head structure (4) includes a cone (41), which is screwed to the inner wall of the probe housing (1). A support ring (42) is fixedly installed at the lower end of the inner wall of the cone (41). A pressure sensor (43) is inserted through the inner wall of the support ring (42). A retaining ring is fixedly connected to the outer wall of the pressure sensor (43), and the retaining ring is engaged with the upper surface of the support ring (42). A retaining plate (44) is fixedly installed on the outer wall of the pressure sensor (43). A spring (45) is fitted on the outer wall of the pressure sensor (43). One end of the spring (45) is fixedly connected to the retaining plate (44), and the other end of the spring (45) is fixedly connected to the support ring (42). A cone head (46) is fixedly installed at the lower end of the outer wall of the pressure sensor (43).

4. The roadbed compaction testing device according to claim 1, characterized in that: The inner wall of the probe housing (1) is fixed with a heat insulation plate (6), which is located at the upper end of the depth sensor (5).

5. The roadbed compaction testing device according to claim 3, characterized in that: The pressure sensor (43) has threads machined on the upper end of its outer wall, and the inner wall of the support ring (42) has a threaded hole. The upper end of the pressure sensor (43) is screwed to the inner wall of the support ring (42).

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