An acceleration sensor device for monitoring temporary construction roads

Abstract

This utility model provides an acceleration sensor device for monitoring temporary construction access roads, belonging to the technical field of monitoring temporary construction access roads. The acceleration sensor device includes: a monitoring base, a vibration sensing component, a signal transmission component, a protective shell, and a fixed support frame. The monitoring base is a cuboid structure with a mounting groove on its top, in which the vibration sensing component is installed. The vibration sensing component includes a sensor body, an elastic reset plate, and a counterweight. The sensor body is cylindrical and fixedly positioned at the center of the mounting groove. The counterweight is rotatably connected to the inside of the sensor body via bearings. The counterweight has an eccentrically distributed fan-shaped structure. This invention solves the technical problems of existing vibration monitoring devices for temporary construction access roads, such as complex structure, difficult installation, poor environmental adaptability, and low monitoring accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of monitoring technology for temporary construction access roads, specifically, it relates to an acceleration sensor device for monitoring temporary construction access roads. Background Technology

[0002] Temporary construction access roads are common temporary traffic facilities in construction projects, mainly used for the passage of construction vehicles and equipment. Due to their temporary nature, the construction standards of these access roads are relatively low. Coupled with the repeated pressure from heavy vehicles over long periods, they are prone to problems such as road surface settlement, cracking, and deformation. Traditional monitoring of access roads mainly relies on manual inspections and visual checks, which have drawbacks such as low monitoring frequency, strong subjectivity, and inability to detect potential problems in a timely manner. With the continuous improvement of engineering safety requirements, the need for real-time monitoring of access road conditions is becoming increasingly urgent. Existing vibration monitoring equipment is mainly designed for permanent roads, with complex structures, high costs, and cumbersome installation procedures, making it unsuitable for the rapid deployment and removal of temporary construction access roads. Some simple vibration monitoring devices, although low in cost, lack sufficient monitoring accuracy and have poor environmental adaptability, failing to meet the complex environmental requirements of construction sites. Existing vibration sensors mostly adopt electronic designs, requiring complex signal processing circuits and power supply systems, making them prone to failure in the harsh environment of construction sites and resulting in high maintenance costs. Furthermore, existing monitoring devices are mostly fixed installations, making disassembly difficult and unsuitable for the usage characteristics of temporary construction access roads. Therefore, there is an urgent need to develop a simple, easy-to-install, highly accurate, environmentally adaptable, and low-cost vibration monitoring device for sidewalks. Utility Model Content

[0003] In view of this, the present invention provides an acceleration sensor device for monitoring temporary construction access roads, which can solve the technical problems of existing vibration monitoring devices for temporary construction access roads, such as complex structure, difficult installation, poor environmental adaptability, and low monitoring accuracy.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an acceleration sensor device for monitoring temporary construction access roads, comprising: a monitoring base, a vibration sensing component, a signal transmission component, a protective shell, and a fixed support frame; the monitoring base is a cuboid structure, with a mounting groove on the top of the monitoring base, and the vibration sensing component is installed in the mounting groove; the vibration sensing component includes a sensor body, an elastic reset plate, and a counterweight; the sensor body is cylindrical and fixedly positioned at the center of the mounting groove, and the counterweight is rotatably connected to the inside of the sensor body via bearings; the counterweight has an eccentrically distributed fan-shaped structure; at least four circumferentially evenly distributed... The sensor window contains an elastic reset plate, one end of which is fixedly connected to the inner wall of the sensor body, and the other end contacts the outer circumferential surface of the counterweight. The signal transmission component includes a transmission cable and a junction box. The junction box is fixedly installed on the side of the monitoring base. One end of the transmission cable is electrically connected to the vibration sensing component, and the other end passes through the inlet hole of the junction box to connect to external equipment. The protective shell is installed above the monitoring base and is bolted to the monitoring base. The fixed support frame includes a base plate and a support column. The base plate is circular, and the support column is vertically fixed at the center of the base plate. The top of the support column is fixedly connected to the monitoring base.

[0006] The technical advantages of the accelerometer sensor device for monitoring temporary construction access roads provided by this utility model are as follows: Through the combined design of the monitoring base, vibration sensing component, signal transmission component, protective shell, and fixed support frame, effective monitoring and acquisition of vibration signals from temporary construction access roads are achieved. The counterweight in the vibration sensing component adopts an eccentrically distributed fan-shaped structure, which can produce different responses to vibrations in different directions, improving the sensitivity and directionality of monitoring. The elastic reset plate ensures that the counterweight can quickly return to its initial position after the vibration stops, ensuring the continuity and stability of monitoring.

[0007] Based on the above technical solution, the acceleration sensor device for monitoring temporary construction access roads of this utility model can be further improved as follows:

[0008] The counterweight includes a main body and a counterweight. The main body is circular, and the counterweight is fan-shaped and fixedly connected to one side of the main body. A shaft hole is provided at the geometric center of the main body, and a bearing is installed in the shaft hole. The outer ring of the bearing is interference-fitted with the inner wall of the shaft hole, and the inner ring of the bearing is rotatably connected to the central axis of the sensor body.

[0009] The beneficial effects of the above-mentioned improvement scheme are as follows: The counterweight adopts a separate design for the main body and the counterweight part. The circular structure of the main body ensures rotational balance, while the fan-shaped structure of the counterweight part achieves uneven mass distribution, enhancing sensitivity to vibration. The design of bearings installed in the shaft hole reduces frictional resistance, enabling the counterweight to respond more sensitively to minute vibration signals and improving monitoring accuracy. The interference fit connection ensures reliable fixing of the bearing and the counterweight, preventing loosening during long-term use.

[0010] Furthermore, the elastic reset plate has a thin sheet structure, the material of the elastic reset plate is spring steel, the fixed end of the elastic reset plate is fixed to the inner wall of the sensor body by screws, and the free end of the elastic reset plate has an arc-shaped structure that is tangentially contacted with the outer circumferential surface of the counterweight; the depth of the sensing window is 2 to 3 times the thickness of the elastic reset plate.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The elastic reset plate is made of spring steel, which has excellent elasticity and fatigue resistance, and can withstand long-term repeated deformation without failure. The thin-plate structure reduces the damping effect and improves the system's response speed. The free end of the arc-shaped structure is in tangential contact with the outer circumference of the counterweight, increasing the contact area, reducing contact stress, and extending service life. The reasonable design of the sensing window depth provides sufficient space for the deformation of the elastic reset plate, avoiding damage caused by excessive compression.

[0012] Furthermore, the outer wall of the sensor body is provided with at least three circumferentially evenly distributed contact protrusions. The contact protrusions are hemispherical in shape, and the top of the contact protrusions contacts the middle of the elastic reset piece. The diameter of the contact protrusions is 1 / 10 to 1 / 8 of the outer diameter of the sensor body, and the height of the contact protrusions is 1 / 2 to 2 / 3 of the wall thickness of the sensor body.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the hemispherical structure design of the contact protrusion reduces the contact area with the elastic reset plate, lowers frictional resistance, and improves the system sensitivity. The circumferentially uniform distribution of the protrusions ensures uniform transmission of vibration signals in all directions, avoiding directional deviation. The precise control of the protrusion diameter and height ensures appropriate contact pressure with the elastic reset plate, preventing excessive preload from affecting sensitivity and preventing signal loss due to poor contact.

[0014] Furthermore, the protective shell has a hemispherical structure, is made of aluminum alloy, and its bottom edge is sealed to the top periphery of the monitoring base by a sealing ring.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The protective shell adopts a hemispherical structure design, which has a good streamlined appearance and can effectively reduce the impact of wind resistance and rain erosion on the equipment. The aluminum alloy material has good corrosion resistance and lightweight properties, which not only ensures long-term reliability but also reduces the overall weight, facilitating installation and maintenance. The sealing ring ensures that the internal precision components are not affected by the external environment, thereby improving the protection level and service life of the equipment.

[0016] Furthermore, the support column is a hollow cylindrical structure with a cable channel inside, through which the transmission cable is led out from the bottom of the support column; the bottom surface of the base plate has at least 6 circumferentially evenly distributed mounting holes for fixing to the sidewalk surface with expansion bolts; the connection between the support column and the base plate is provided with reinforcing ribs, which are radially distributed along the circumference of the support column.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the hollow cylindrical structure design of the support column reduces weight while ensuring structural strength; the cable channel effectively protects the transmission cables, preventing damage from external forces; the multiple mounting holes in the base plate increase the number of fixing points to the access road surface, improving installation stability and reliability; and the radial distribution of the reinforcing ribs effectively disperses the load from above, enhances the structural strength at the connection between the support column and the base plate, and prevents fatigue failure.

[0018] Furthermore, the top of the monitoring base is provided with multiple drainage grooves, which are distributed radially.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the drainage groove design on the top of the monitoring base effectively guides rainwater to the surrounding area, preventing water from accumulating on the top of the base and avoiding water penetration that could corrode and damage internal electronic components. The radially distributed groove structure ensures drainage in all directions, improving the reliability and stability of the equipment under harsh weather conditions.

[0020] Furthermore, the inner wall of the sensor body is provided with a spiral guide groove.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral guide groove design on the inner wall of the sensor body can guide the rotational movement of the counterweight, making its movement trajectory more regular and stable. The presence of the guide groove reduces the direct collision between the counterweight and the inner wall, reducing noise and wear, and extending the service life of the equipment. The spiral structure can also filter the vibration signal to a certain extent, improving the signal quality and monitoring accuracy.

[0022] Furthermore, the outer circumferential surface of the counterweight is provided with a wavy protrusion structure.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the wavy protrusion structure on the outer circumference of the counterweight increases the contact area with the elastic reset plate, improving the force transmission efficiency. During the rotation of the counterweight, the protrusion structure can periodically compress and release the elastic reset plate, enhancing the signal variation amplitude and improving monitoring sensitivity. The wavy design also reduces the adhesion between the counterweight and the elastic reset plate, ensuring rapid and accurate response.

[0024] Furthermore, the depth of the drainage groove is 1 / 5 to 1 / 3 of the height of the monitoring base, and the pitch of the spiral guide groove is 1 / 4 to 1 / 2 of the height of the sensor body.

[0025] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: Reasonable control of the drainage groove depth ensures both effective drainage and avoids structural strength reduction due to excessive depth. The precise design of the spiral guide groove pitch ensures the smoothness and stability of the counterweight's movement, avoiding irregular movement caused by excessively dense or sparse grooves. These optimized dimensional parameters improve the overall performance of the device, ensuring long-term stable monitoring results.

[0026] Compared with existing technologies, the advantages of this invention's accelerometer sensor device for monitoring temporary construction access roads are as follows: This invention, through a unique vibration sensing component design, employs a structure combining an eccentric counterweight and an elastic reset plate, achieving high-precision monitoring of multi-directional vibration signals from temporary construction access roads. The device has a compact structure and is easy to install, requiring only expansion bolts to be fixed to the road surface for immediate use. The hemispherical design and sealed structure of the protective shell ensure reliable operation of the equipment in harsh environments. The hollow structure of the support column and the cable channel design protect the transmission cables, preventing damage from external forces. The drainage groove prevents water accumulation from affecting the equipment. The entire device uses a mechanical vibration sensing principle, eliminating the need for a complex electronic control system, thus reducing the failure rate and maintenance costs. The eccentric design of the counterweight and the rapid response characteristics of the elastic reset plate significantly improve the monitoring sensitivity and response speed. The innovative design of the spiral guide groove and the wavy raised structure further optimizes signal transmission efficiency, ensuring the accuracy and reliability of the monitoring data. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is a schematic diagram of an acceleration sensor device for monitoring temporary construction access roads;

[0029] Figure 2 This is a top view of the sensor body;

[0030] Figure 3 This is a side view of the sensor body;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Monitoring base; 20. Vibration sensing component; 30. Signal transmission component; 40. Protective housing; 50. Fixed support frame. Detailed Implementation

[0033] 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.

[0034] like Figure 1-3 The image shows a first embodiment of an acceleration sensor device for monitoring temporary construction access roads provided by this utility model. In this embodiment, it includes: a monitoring base 10, a vibration sensing component 20, a signal transmission component 30, a protective housing 40, and a fixed support frame 50. The monitoring base is a cuboid structure, with a mounting groove on its top, into which the vibration sensing component is installed. The vibration sensing component includes a sensor body, an elastic reset plate, and a counterweight. The sensor body is cylindrical and fixedly positioned at the center of the mounting groove. The counterweight is rotatably connected to the inside of the sensor body via bearings. The counterweight has an eccentrically distributed fan-shaped structure. The sidewalls of the sensor body... The system has at least four circumferentially evenly distributed sensing windows, each containing an elastic reset plate. One end of the elastic reset plate is fixedly connected to the inner wall of the sensor body, while the other end contacts the outer circumferential surface of the counterweight. The signal transmission component includes a transmission cable and a junction box. The junction box is fixedly installed on the side of the monitoring base. One end of the transmission cable is electrically connected to the vibration sensing component, and the other end passes through the inlet hole of the junction box to connect to external equipment. A protective housing is installed above the monitoring base, and the protective housing is bolted to the monitoring base. The fixed support frame includes a base plate and a support column. The base plate is circular, and the support column is vertically fixed at the center of the base plate. The top of the support column is fixedly connected to the monitoring base.

[0035] In the above technical solution, the counterweight includes a main body and a counterweight. The main body has a circular structure, and the counterweight has a fan-shaped structure and is fixedly connected to one side of the main body. A shaft hole is opened at the geometric center of the main body, and a bearing is installed in the shaft hole. The outer ring of the bearing is interference-fitted with the inner wall of the shaft hole, and the inner ring of the bearing is rotatably connected to the central shaft of the sensor body.

[0036] Furthermore, in the above technical solution, the elastic reset sheet is a thin sheet structure, the material of the elastic reset sheet is spring steel, the fixed end of the elastic reset sheet is fixed to the inner wall of the sensor body by screws, and the free end of the elastic reset sheet has an arc-shaped structure that is tangentially contacted with the outer circumferential surface of the counterweight; the depth of the sensing window is 2 to 3 times the thickness of the elastic reset sheet.

[0037] Furthermore, in the above technical solution, at least three circumferentially evenly distributed contact protrusions are provided on the outer wall of the sensor body. The contact protrusions are hemispherical in shape, and the top of the contact protrusions contacts the middle of the elastic reset piece. The diameter of the contact protrusions is 1 / 10 to 1 / 8 of the outer diameter of the sensor body, and the height of the contact protrusions is 1 / 2 to 2 / 3 of the wall thickness of the sensor body.

[0038] Furthermore, in the above technical solution, the protective shell has a hemispherical structure, the material of the protective shell is aluminum alloy, and the bottom edge of the protective shell is sealed to the top periphery of the monitoring base by a sealing ring.

[0039] Furthermore, in the above technical solution, the support column is a hollow cylindrical structure, and a cable channel is provided inside the support column. The transmission cable passes through the cable channel and is led out from the bottom of the support column. The bottom surface of the base plate is provided with at least 6 circumferentially evenly distributed mounting holes, which are used to fix the support column to the sidewalk surface by expansion bolts. A reinforcing rib is provided at the connection between the support column and the base plate, and the reinforcing rib is radially distributed along the circumference of the support column.

[0040] Furthermore, in the above technical solution, the top of the monitoring base is provided with multiple drainage grooves, which are distributed radially.

[0041] Furthermore, in the above technical solution, the inner wall of the sensor body is provided with a spiral guide groove.

[0042] Furthermore, in the above technical solution, the outer circumferential surface of the counterweight is provided with a wave-shaped protrusion structure.

[0043] Furthermore, in the above technical solution, the depth of the drainage groove is 1 / 5 to 1 / 3 of the height of the monitoring base, and the pitch of the spiral guide groove is 1 / 4 to 1 / 2 of the height of the sensor body.

[0044] In this embodiment, the monitoring base is made of 6061 aluminum alloy, with an overall rectangular structure, 200mm in length, 150mm in width, and 80mm in height. The mounting groove at the top is 50mm deep and has an inner diameter of 120mm. The sensor body of the vibration sensing component is made of stainless steel, with a cylindrical structure, an outer diameter of 110mm, an inner diameter of 80mm, a height of 40mm, and a wall thickness of 15mm. The main body of the counterweight is made of 45# steel, with a diameter of 75mm and a thickness of 20mm. The counterweight part is made of lead alloy, with a fan-shaped structure, a fan angle of 90 degrees, and a thickness of 20mm. The total weight is approximately 500 grams. The bearing is a deep groove ball bearing, model 6008, with an inner diameter of 40mm and an outer diameter of 68mm. The elastic reset plate is made of 65Mn spring steel, with a thickness of 0.5mm, a length of 30mm, and a width of 10mm. Its surface is hardened to improve elasticity and fatigue resistance. The sensor window has a depth of 1.5mm, a width of 12mm, and a length of 35mm. The contact protrusion is made of stainless steel, with a diameter of 12mm and a height of 8mm, and is hemispherical in shape. The protective shell is made of aluminum alloy, also hemispherical in shape, with a diameter of 250mm and a wall thickness of 3mm. Its surface is anodized to improve corrosion resistance. The sealing ring is made of nitrile rubber, with an O-shaped cross-section and a diameter of 3mm. The base plate of the fixed support frame is made of Q235 steel, with a diameter of 300mm and a thickness of 10mm, and is hot-dip galvanized. The support column is made of seamless steel pipe, with an outer diameter of 60mm, an inner diameter of 50mm, and a height of 200mm. The mounting hole has a diameter of 16mm and is used to install M12 expansion bolts. The reinforcing ribs are made of Q235 steel, 5mm thick and 80mm high, with 8 ribs arranged radially and evenly. The transmission cables are shielded cables, 2×1.5 mm², with lengths determined by site requirements, typically 10 to 50 meters. The junction boxes are made of engineering plastics, with an IP65 protection rating, and include internal terminals and surge protection modules. The drainage grooves are 15mm deep and 8mm wide, with 8 grooves arranged radially and evenly. The spiral guide grooves have a pitch of 10mm, a width of 3mm, and a depth of 2mm. The wavy protrusions have a peak height of 2mm, a trough depth of 1mm, and a wavelength of 5mm. The entire device works by transmitting vibration signals from the sidewalk under vehicle loads to the monitoring base via a fixed support frame, then to the vibration sensing component. The counterweight rotates under vibration excitation, and this rotation is converted into an electrical signal by the elastic deformation of the elastic reset plate. This signal is then transmitted to external monitoring equipment for recording and analysis via the signal transmission component. The device is easy to install; simply fix the base plate to the road surface and connect the transmission cable to put it into use. The entire device has a compact structure, occupies a small area, and has minimal impact on road traffic, making it suitable for vibration monitoring needs of various temporary construction access roads.

[0045] Specifically, the principle of this invention is as follows: This device employs a mechanical vibration sensing principle, detecting the vibration state of the sidewalk through the rotational motion of an eccentric counterweight under vibration. When the sidewalk vibrates under vehicle load, the vibration is transmitted to the monitoring base via a fixed support frame, and then to the vibration sensing component. Due to its eccentric mass distribution characteristics, the counterweight in the vibration sensing component rotates under vibration excitation. This rotational motion is converted into a measurable mechanical displacement signal through the elastic deformation of the elastic reset plate. The degree of deformation of the elastic reset plate is closely related to the amplitude and frequency of the vibration; monitoring the deformation state of the elastic reset plate reflects the vibration intensity of the sidewalk. The eccentric design of the counterweight allows the device to respond differently to vibrations in different directions, improving the directionality and sensitivity of the monitoring. The spiral guide groove on the inner wall of the sensor body guides the movement trajectory of the counterweight, making its movement more regular and stable, reducing interference from random vibrations. The hemispherical structure of the contact protrusion reduces frictional resistance and improves the system's response speed. The protective shell design ensures that the internal precision components are protected from the influence of the external environment, guaranteeing the stability of long-term monitoring. The entire device requires no external power supply or complex electronic control system. It achieves high-precision vibration monitoring solely through the precise design of its mechanical structure, and features simple structure, high reliability, and convenient maintenance.

[0046] When using the device, first select a suitable installation point at the location of the sidewalk to be monitored, ensuring the installation surface is flat and firm, and remove debris and water from the installation area. Place the base plate of the fixed support frame at the installation position, mark the installation positions of the expansion bolts through the mounting holes on the base plate, drill holes with an electric hammer, and install the expansion bolts to firmly fix the base plate to the sidewalk surface. Install the monitoring base on top of the support column, ensuring a secure connection, and check the installation status of each component. Install the vibration sensing component in the mounting groove of the monitoring base, ensuring the sensor body is centered in the groove and the counterweight can rotate freely. Pass the transmission cable through the cable channel of the support column, connecting one end to the vibration sensing component and the other end to the external monitoring equipment through the junction box. Install the protective housing, ensuring a good seal with the monitoring base. Turn on the external monitoring equipment, perform system debugging, check whether the signal transmission is normal, and set the monitoring parameters and alarm thresholds. After the equipment is put into normal operation, regularly check the tightness of each connection, clean the dust and debris from the surface of the protective housing, and check the sealing effect of the sealing ring. During the monitoring process, attention should be paid to the movement of the counterweight to ensure that it can rotate freely. Any abnormalities should be dealt with promptly.

Claims

1. An acceleration sensor device for monitoring temporary construction access roads, characterized in that, include: The system comprises a monitoring base, a vibration sensing component, a signal transmission component, a protective housing, and a fixed support frame. The monitoring base is a rectangular parallelepiped structure with a mounting groove on its top, within which the vibration sensing component is installed. The vibration sensing component includes a sensor body, an elastic reset plate, and a counterweight. The sensor body is cylindrical and fixedly positioned at the center of the mounting groove. The counterweight, eccentrically distributed and fan-shaped, is rotatably connected to the inside of the sensor body via bearings. At least four circumferentially evenly distributed sensing windows are provided on the sidewall of the sensor body, each containing an elastic reset plate. One end of the reset plate is fixedly connected to the inner wall of the sensor body, and the other end is in contact with the outer circumferential surface of the counterweight; the signal transmission component includes a transmission cable and a junction box, the junction box is fixedly installed on the side of the monitoring base, one end of the transmission cable is electrically connected to the vibration sensing component, and the other end passes through the inlet hole of the junction box to connect to external equipment; the protective shell is installed on top of the monitoring base, and the protective shell is connected to the monitoring base by bolts; the fixed support frame includes a base plate and a support column, the base plate is circular, the support column is vertically fixed at the center of the base plate, and the top of the support column is fixedly connected to the monitoring base.

2. The acceleration sensor device for monitoring temporary construction access roads according to claim 1, characterized in that, The counterweight includes a main body and a counterweight. The main body has a circular structure, and the counterweight has a fan-shaped structure and is fixedly connected to one side of the main body. A shaft hole is opened at the geometric center of the main body, and a bearing is installed in the shaft hole. The outer ring of the bearing is interference-fitted with the inner wall of the shaft hole, and the inner ring of the bearing is rotatably connected to the central axis of the sensor body.

3. An acceleration sensor device for monitoring temporary construction access roads according to claim 2, characterized in that, The elastic reset plate is a thin sheet structure made of spring steel. The fixed end of the elastic reset plate is fixed to the inner wall of the sensor body by screws, and the free end of the elastic reset plate is arc-shaped and tangentially contacts the outer circumferential surface of the counterweight. The depth of the sensing window is 2 to 3 times the thickness of the elastic reset plate.

4. An acceleration sensor device for monitoring temporary construction access roads according to claim 3, characterized in that, The outer wall of the sensor body is provided with at least three circumferentially evenly distributed contact protrusions. The contact protrusions are hemispherical in shape, and the top of the contact protrusions contacts the middle of the elastic reset piece. The diameter of the contact protrusions is 1 / 10 to 1 / 8 of the outer diameter of the sensor body, and the height of the contact protrusions is 1 / 2 to 2 / 3 of the wall thickness of the sensor body.

5. An acceleration sensor device for monitoring temporary construction access roads according to claim 4, characterized in that, The protective shell has a hemispherical structure and is made of aluminum alloy. The bottom edge of the protective shell is sealed to the top periphery of the monitoring base by a sealing ring.

6. An acceleration sensor device for monitoring temporary construction access roads according to claim 5, characterized in that, The support column is a hollow cylindrical structure with a cable channel inside. The transmission cable passes through the cable channel and is led out from the bottom of the support column. The bottom surface of the base plate has at least 6 circumferentially evenly distributed mounting holes for fixing to the sidewalk surface with expansion bolts. The connection between the support column and the base plate is provided with a reinforcing rib plate, which is radially distributed along the circumference of the support column.

7. An acceleration sensor device for monitoring temporary construction access roads according to claim 6, characterized in that, The top of the monitoring base is provided with multiple drainage grooves, which are distributed radially.

8. An acceleration sensor device for monitoring temporary construction access roads according to claim 7, characterized in that, The inner wall of the sensor body is provided with a spiral guide groove.

9. An acceleration sensor device for monitoring temporary construction access roads according to claim 8, characterized in that, The outer circumference of the counterweight is provided with a wavy protrusion structure.

10. An acceleration sensor device for monitoring temporary construction access roads according to claim 9, characterized in that, The depth of the drainage groove is 1 / 5 to 1 / 3 of the height of the monitoring base, and the pitch of the spiral guide groove is 1 / 4 to 1 / 2 of the height of the sensor body.

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