Tunnel top height measuring device

Abstract

The utility model discloses a tunnel top height measuring device, which comprises a supporting table, supporting legs are arranged at the lower end of the supporting table, mounting blocks are symmetrically arranged at the upper end of the supporting table, a rotatable rotating shaft is arranged between the two mounting blocks, a rotating rod is fixed on the outer side surface of the rotating shaft, a fixing plate is arranged at the upper end of the rotating rod, and the fixing plate is fixed on the supporting table. A laser range finder is arranged at the upper end of the fixing plate, and the angle measuring instrument is arranged in a groove of the rotating rod and used for detecting the inclination angle of the laser range finder; the driving mechanism is arranged at one end of the rotating shaft and used for controlling the laser range finder to rotate and keep the laser range finder stable, the stability of the laser range finder can be guaranteed when the laser range finder conducts inclined measurement, meanwhile, the device does not need to be moved when the height of each position of the top of the tunnel is measured, and the working efficiency is improved. The height distance can be accurately measured, and the convenience of tunnel height measurement is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel measurement technology, specifically a device for measuring the height of the tunnel top. Background Technology

[0002] During tunnel construction, accurate measurement of tunnel height helps construction workers to carry out excavation and lining operations according to design requirements. By monitoring tunnel height in real time, construction deviations can be detected in a timely manner, avoiding situations where the height is insufficient or excessive, ensuring that the tunnel structure meets design standards, thereby ensuring construction safety and project quality.

[0003] A measuring device for tunnel construction, disclosed in announcement number CN222336358U, allows a laser rangefinder to rotate 360° through the corresponding connection between the anti-detachment shaft and the anti-detachment rotation groove, increasing the adjustable range. However, the aforementioned measuring device requires manual adjustment of the laser rangefinder's rotation. After determining the measurement position, the laser rangefinder needs to be held by hand. When recording data, the laser rangefinder is prone to instability, affecting the accuracy of the measurement results. At the same time, because the tunnel ceiling is an arc-shaped structure, the aforementioned measuring device cannot measure the angle of the laser rangefinder. Without moving the measuring device, it is impossible to obtain the vertical height of the tunnel measurement position when the laser rangefinder is tilted, making the measurement very inconvenient. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a tunnel top height measuring device that can ensure the stability of the laser rangefinder when measuring at an angle. At the same time, when measuring the height at various positions on the tunnel top, the device can accurately measure the height and distance without moving it, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tunnel top height measuring device, comprising a support platform, legs at the lower end of the support platform, mounting blocks symmetrically arranged at the upper end of the support platform, a rotatable shaft between the two mounting blocks, a rotating rod fixed to the outer side of the rotating shaft, a fixing plate at the upper end of the rotating rod, and a laser rangefinder at the upper end of the fixing plate, and further comprising:

[0006] An angle measuring instrument is installed in the groove of the rotating rod and is used to detect the tilt angle of the laser rangefinder.

[0007] A drive mechanism, located at one end of the rotating shaft, is used to control the rotation of the laser rangefinder and maintain its stability. The drive mechanism includes a gear, a rack, an electric push rod, and a mounting plate. The gear is fixed at one end of the rotating shaft, and a rack is located above the gear. The teeth on the rack mesh with the gear. The telescopic end of the electric push rod is connected to one end of the rack, and the fixed end of the electric push rod is connected to the mounting plate. The mounting plate is fixed to the outer side of the support platform.

[0008] An auxiliary height measuring mechanism is symmetrically arranged on both sides of the rotating rod to measure the vertical height of the laser rangefinder's transmitter from the support platform.

[0009] As a preferred embodiment of this utility model, screws are symmetrically arranged inside the groove, and the screws are threadedly connected to the rotating rod. One end of the screw located inside the groove is rotatably connected to the pressure block through a bearing.

[0010] As a preferred embodiment of this invention, the end of the pressure block facing the angle measuring instrument is covered with rubber.

[0011] As a preferred technical solution of this utility model, a positioning shell is fixed to the upper end of the support platform. The upper end and front side of the positioning shell are open. The two sides of the positioning shell are provided with slots that are adapted to the width direction of the laser rangefinder. The upper surface of the support platform is provided with a bottom groove that is adapted to the bottom of the laser rangefinder.

[0012] As a preferred technical solution of this utility model, the upper end of the support platform is symmetrically provided with guide frames, the rack passes through the guide frames, the upper surface of the rack is integrally connected with an I-shaped long block, the guide frames are provided with I-shaped grooves, and the I-shaped long block slides in the I-shaped grooves.

[0013] As a preferred embodiment of this utility model, the auxiliary height measuring mechanism includes a vertical telescopic rod, a horizontal telescopic rod, and a rotating sleeve. The fixed part of the vertical telescopic rod is fixed to the upper end face of the support platform. The outer side of the telescopic part of the vertical telescopic rod is evenly distributed with scales. The upper end of the vertical telescopic rod is rotatably connected to the rotating sleeve. The outer side of the rotating sleeve is fixed with a horizontal telescopic rod. The vertical telescopic rod is perpendicular to the horizontal telescopic rod. The tail end of the telescopic part of the horizontal telescopic rod is fixed with a pointer.

[0014] As a preferred embodiment of this utility model, a control switch is provided on the upper surface of the support platform, and the output end of the control switch is electrically connected to the input end of the electric push rod.

[0015] As a preferred embodiment of this utility model, the lower end of the support leg is provided with a universal locking wheel.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This tunnel top height measuring device, by setting a drive mechanism, controls the horizontal movement of the rack through an electric push rod, thereby driving the gear to rotate, causing the laser rangefinder to swing and measure the height at different positions on the tunnel top. This ensures the stability of the laser rangefinder in the tilted state, thus making the measurement data more accurate. When measuring different positions on the tunnel top, there is no need to move the device. By setting an angle measuring instrument on the rotating rod, the vertical height data of the tunnel top measured by the laser rangefinder at different angles is calculated according to the angle of the angle measuring instrument and the measured data of the laser rangefinder in the tilted state, based on the trigonometric function. This greatly improves the convenience and accuracy of measurement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model in use;

[0018] Figure 2 for Figure 1 The main view;

[0019] Figure 3 for Figure 2 The left view;

[0020] Figure 4 This is a schematic diagram of the structure of this utility model after removing the laser rangefinder and angle measuring instrument.

[0021] In the diagram: 1 Support platform, 2 Mounting block, 3 Rotary shaft, 4 Rotary rod, 5 Fixing plate, 6 Laser rangefinder, 7 Groove, 8 Angle measuring instrument, 9 Pressure block, 10 Screw, 11 Positioning shell, 12 Slot, 13 Bottom groove, 14 Drive mechanism, 141 Gear, 142 Rack, 143 Electric push rod, 144 Mounting plate, 145 Guide frame, 146 I-shaped long block, 147 Control switch, 15 Auxiliary height measuring mechanism, 151 Vertical telescopic rod, 152 Scale, 153 Rotating sleeve, 154 Horizontal telescopic rod, 155 Pointer, 16 Support leg, 17 Universal locking wheel. Detailed Implementation

[0022] 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 (for ease of description and understanding, hereinafter referred to as...). Figure 2 (The above is described above). Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Please see Figure 1-4This utility model provides a technical solution: a tunnel top height measuring device, including a support platform 1, a support leg 16 at the lower end of the support platform 1, mounting blocks 2 symmetrically arranged at the upper end of the support platform 1, a rotatable shaft 3 between the two mounting blocks 2, a rotating rod 4 fixed on the outer side of the rotating shaft 3, a fixing plate 5 at the upper end of the rotating rod 4, and a laser rangefinder 6 at the upper end of the fixing plate 5.

[0024] Without moving the device, when measuring the height at any position on the top of the tunnel's arc, a drive mechanism 14 is provided at one end of the rotating shaft 3. The drive mechanism 14 includes a gear 141, a rack 142, an electric push rod 143, and a mounting plate 144. The gear 141 is fixed at one end of the rotating shaft 3, and a rack 142 is provided above the gear 141. The teeth on the rack 142 mesh with the gear 141. The telescopic end of the electric push rod 143 is connected to one end of the rack 142, and the fixed end of the electric push rod 143 is connected to the mounting plate 144. The mounting plate 144 is fixed on the outer side of the support platform 1. The telescopic movement of the rack 142 is controlled by the extension and retraction of the electric push rod 143, which in turn drives the gear 142 to rotate. The gear 142 drives the rotating shaft 3 to rotate, causing the laser rangefinder 6 to rotate until the laser emitted by the laser rangefinder 6 corresponds to the position to be measured. The meshing action of the gear 142 and the rack 142 ensures the stability of the laser rangefinder 6.

[0025] A groove 7 is provided on one side of the rotating rod 4, and an angle measuring instrument 8 is fixed in the groove 7. When the laser rangefinder 6 is tilted to measure the position of the top of the tunnel, the data measured by the laser rangefinder 6 is the hypotenuse. Based on the angle of the angle measuring instrument 8, the vertical height of the transmitting end of the laser rangefinder 6 from the measurement position of the top of the tunnel is calculated according to the trigonometric function theorem.

[0026] To facilitate the calculation of the vertical height of the laser rangefinder 6's transmitter from the ground, an auxiliary height measuring mechanism 15 is provided on the support platform. This auxiliary height measuring mechanism 15 is symmetrically arranged on both sides of the rotating rod 4. The auxiliary height measuring mechanism 15 includes a vertical telescopic rod 151, a horizontal telescopic rod 154, and a rotating sleeve 153. The fixed part of the vertical telescopic rod 151 is fixed to the upper surface of the support platform 1. The outer surface of the telescopic part of the vertical telescopic rod 151 is evenly distributed with scales 152. The upper end of the vertical telescopic rod 151 is rotatably connected to the rotating sleeve 153. The outer surface of the rotating sleeve 153 is fixed to the horizontal telescopic rod 154. The vertical telescopic rod 151 and the horizontal telescopic rod 154 are perpendicular. A pointer 155 is fixed to the end of the telescopic part. The "zero position" of the vertical telescopic rod 151 is at the upper end of its telescopic part, and the initial scale value of the "zero position" of the vertical telescopic rod 151 is the distance from the bottom of the vertical telescopic rod 151. Its scale value gradually increases from top to bottom. By pulling out the telescopic part of the vertical telescopic rod 151, the pointer 155 is aligned with the height of the transmitting end of the laser rangefinder 6. Then, the telescopic part of the horizontal telescopic rod 154 is pulled out so that the pointer 155 contacts the transmitting end of the laser rangefinder 6 to ensure the accuracy of the measurement data. At this time, the scale value of the telescopic part of the vertical telescopic rod 151 is read, which is the vertical height of the transmitting end of the laser rangefinder 6 from the support platform 1.

[0027] Since the height of the upper end of the support platform 1 from the ground is fixed, the sum of the vertical height of the laser rangefinder 6 from the top of the tunnel to the measurement position calculated by the trigonometric function theorem, the scale value of the telescopic part of the vertical telescopic rod 151, and the height of the support platform 1 from the ground is the height of the measurement position at the top of the tunnel from the ground.

[0028] To facilitate the fixing of the angle measuring instrument 8, screws 10 are symmetrically arranged inside the groove 7. The screws 10 are threadedly connected to the rotating rod 4. One end of the screw 10 located inside the groove 7 is rotatably connected to the pressure block 9 through a bearing. By rotating the screw 10, the two pressure blocks 9 clamp and fix the angle measuring instrument 8.

[0029] To prevent the pressure block 9 from damaging the side of the angle measuring instrument 8, the end of the pressure block 9 facing the angle measuring instrument 8 is covered with rubber.

[0030] To secure the laser rangefinder 6, a positioning shell 11 is fixed to the upper end of the support platform 1. The positioning shell 11 has openings at the upper end and front side to facilitate operation of the laser rangefinder 6's panel. The positioning shell 11 has slots 12 on both sides that are adapted to the width direction of the laser rangefinder 6. The upper surface of the support platform 1 has a bottom groove 13 that is adapted to the bottom of the laser rangefinder 6. In use, the laser rangefinder 6 is inserted into the corresponding bottom groove 13 and slot 12 to secure it.

[0031] To ensure the straightness and stability of the rack 142 during its movement, a guide frame 145 is symmetrically arranged at the upper end of the support platform 1. The rack 142 passes through the guide frame 145, and an I-shaped long block 146 is integrally connected to the upper surface of the rack 142. An I-shaped groove is provided on the guide frame 145, and the I-shaped long block 146 slides in the I-shaped groove.

[0032] To facilitate the measurement personnel in controlling the extension and retraction of the electric push rod 143, a control switch 147 is provided on the upper end face of the support platform 1, and the output end of the control switch 147 is electrically connected to the input end of the electric push rod 143.

[0033] To facilitate the movement of this device, the lower end of the support leg 16 is provided with a universal locking wheel 17.

[0034] In use: Push the measuring device to the position to be measured inside the tunnel. When measuring the height at different positions on the curved top of the tunnel, control switch 147 controls the extension of electric push rod 143, which in turn controls the horizontal movement of rack 142. Rack 142 drives gear 141 and rotating shaft 3 to rotate, which in turn drives laser rangefinder 6 to rotate. Turn on the switch on laser rangefinder 6, and laser rangefinder 6 emits a laser. At this time, the display screen on laser rangefinder 6 shows the straight-line distance from a certain position on the top of the tunnel to the emitting end of laser rangefinder 6. According to the tilt angle of angle measuring instrument 8, according to the trigonometric function... The vertical height between a certain position at the top of the tunnel and the transmitter of the laser rangefinder 6 is calculated. Then, the telescopic parts of the vertical telescopic rod 151 and the horizontal telescopic rod 154 are pulled out so that the indicator 155 on the horizontal telescopic rod 154 contacts the transmitter of the laser rangefinder 6. At this time, the scale value of the extended vertical telescopic rod 151 is recorded. The sum of the vertical height between a certain position at the top of the tunnel and the transmitter of the laser rangefinder 6, the scale value of the extended vertical telescopic rod 151, and the fixed height value of the upper surface of the support platform 1 from the ground is the height distance between a certain position at the top of the tunnel and the ground.

[0035] By repeating the above steps, the height of any point on the top of the tunnel's arc from the ground can be measured.

[0036] The parts of the utility model not described in detail are prior art. Although embodiments of the utility model 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 utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A tunnel top height measuring device, comprising a support platform (1), wherein a support leg (16) is provided at the lower end of the support platform (1), and mounting blocks (2) are symmetrically arranged at the upper end of the support platform (1), a rotatable shaft (3) is provided between the two mounting blocks (2), a rotating rod (4) is fixed to the outer side of the rotating shaft (3), a fixing plate (5) is provided at the upper end of the rotating rod (4), and a laser rangefinder (6) is provided at the upper end of the fixing plate (5), characterized in that: Also include: Angle measuring instrument (8) is arranged in the groove (7) of the rotating rod (4), used for detecting the inclination angle of laser range finder (6); Drive mechanism (14) is arranged at one end of the rotating shaft (3), used for controlling the rotation and keeping the stability of the laser range finder (6), the drive mechanism (14) includes gear (141), rack (142), electric push rod (143) and mounting plate (144), the gear (141) is fixed at one end of the rotating shaft (3), the gear (141) is provided with rack (142) above, the teeth on the rack (142) are engaged with the gear (141), the telescopic end of the electric push rod (143) is connected with one end of the rack (142), the fixed end of the electric push rod (143) is connected with the mounting plate (144), and the mounting plate (144) is fixed on the outer side of the support table (1); Auxiliary height measuring mechanism (15) is symmetrically arranged on both sides of the rotating rod (4), used for measuring the vertical height of the emitting end of the laser range finder (6) from the support table (1).

2. A tunnel roof height measuring device according to claim 1, characterised in that: The inside of the groove (7) is symmetrically provided with a screw rod (10), which is threadedly connected with the rotating rod (4), and one end of the screw rod (10) located in the groove (7) is rotatably connected with the pressing block (9) through a bearing.

3. A tunnel roof height measuring device according to claim 2, characterised in that: The end of the pressing block (9) towards the angle measuring instrument (8) is covered with rubber.

4. The tunnel roof height measuring device of claim 1, wherein: The upper end of the support table (1) is fixed with a positioning shell (11), the upper end and the front side of the positioning shell (11) are both opened, the two sides of the positioning shell (11) are provided with clamping grooves (12) matched with the width direction of the laser range finder (6), and the upper end surface of the support table (1) is provided with a bottom groove (13) matched with the bottom of the laser range finder (6).

5. The tunnel roof height measuring device of claim 1, wherein: The upper end of the support table (1) is symmetrically provided with a guide frame (145), the rack (142) passes through the guide frame (145), the upper surface of the rack (142) is integrally connected with an I-shaped long block (146), the guide frame (145) is provided with an I-shaped groove, and the I-shaped long block (146) slides in the I-shaped groove.

6. A tunnel roof height measuring device according to claim 1, characterized in that: The auxiliary height measuring mechanism (15) comprises a vertical telescopic rod (151), a horizontal telescopic rod (154) and a rotating sleeve (153), the fixed part of the vertical telescopic rod (151) is fixed on the upper end surface of the support table (1), the outer side of the telescopic part of the vertical telescopic rod (151) is uniformly provided with a scale (152), the upper end of the vertical telescopic rod (151) is rotatably connected with the rotating sleeve (153), the outer side of the rotating sleeve (153) is fixed with the horizontal telescopic rod (154), the vertical telescopic rod (151) is perpendicular to the horizontal telescopic rod (154), and the tail end of the telescopic part of the horizontal telescopic rod (154) is fixed with a pointing mark (155).

7. A tunnel roof height measuring device according to claim 1, characterized in that: The upper end surface of the support table (1) is provided with a control switch (147), and the output end of the control switch (147) is electrically connected with the input end of the electric push rod (143).

8. The tunnel roof height measuring device of claim 1, wherein: The lower end of the support leg (16) is provided with a universal locking wheel (17).

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