Roadbed slope gradient measuring device and using method

Abstract

The embodiment of the invention provides a roadbed slope gradient measuring device and a using method, and relates to the technical field of road construction, the measuring device comprises a leveling base and a measuring assembly, the leveling base is used for being arranged at the slope toe of a roadbed slope to be measured, and the measuring assembly comprises a laser, an angle indicator and a plurality of box staff; one end of the laser device is rotationally connected with the top end of the leveling base, the angle indicating piece is arranged at the top end of the leveling base and located on one side of the laser device, and the laser device is used for emitting laser rays parallel to the theoretical slope line of the roadbed slope to be measured through the angle indicating piece; and the plurality of box staff are correspondingly and vertically arranged on each check point of the roadbed slope to be measured at intervals along the laser rays. According to the invention, the base and the measuring assembly are leveled, and the laser line parallel to the theoretical gradient line of the roadbed slope to be measured is marked on the box staff of the measuring assembly, so that the deviation between the actual gradient and the theoretical gradient of the roadbed slope to be measured can be conveniently and rapidly obtained, and the gradient measuring efficiency of the roadbed slope is improved.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to a measuring device for the slope of a roadbed side slope and a use method thereof. Background Art

[0002] The roadbed slope refers to the inclined surface where both sides of the roadbed cross section connect to the ground. The shape and slope of the roadbed slope have an important impact on the stability of the roadbed. When measuring the roadbed construction site, the slope of the roadbed slope is generally measured.

[0003] In the prior art, when measuring the slope of a roadbed slope, professional surveying technicians are required to operate professional instruments to measure and process the data. This method is highly dependent on professional surveying technicians. For non-professional surveying technicians, it is difficult to quickly obtain a large amount of measurement data on the slope of a roadbed slope, and the measurement efficiency is low. Summary of the invention

[0004] The embodiment of the present invention provides a device and a method for measuring the slope of a roadbed slope, so as to solve the technical problem that the prior art requires professional surveying technicians to operate professional instruments, resulting in low measurement efficiency.

[0005] In a first aspect, a device for measuring the slope of a roadbed is provided, comprising:

[0006] A leveling base, the leveling base is used to be arranged at the foot of the roadbed slope to be measured;

[0007] A measuring component, the measuring component comprising:

[0008] A laser, one end of which is rotatably connected to the top end of the leveling base;

[0009] An angle indicator, the angle indicator is arranged at the top of the leveling base and located on one side of the laser, the laser is used to use the angle indicator to emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured;

[0010] A plurality of tower rulers are arranged at corresponding vertical intervals along the laser line at each check point of the roadbed slope to be measured.

[0011] In some embodiments, the leveling base includes: a base plate and a telescopic sleeve rod;

[0012] The bottom surface of the base plate is used to be connected to the foot of the roadbed slope to be measured, the bottom end of the telescopic sleeve is connected to the top surface of the base plate, and one end of the laser is rotatably connected to the top end of the telescopic sleeve.

[0013] In some embodiments, the leveling base further comprises: a plurality of leveling screws;

[0014] A plurality of leveling screws are arranged around the telescopic sleeve rod, and the bottom end of each leveling screw is detachably connected to the base plate.

[0015] In some embodiments, the telescopic sleeve rod comprises: a sleeve, a telescopic rod and a fastening screw;

[0016] The bottom end of the sleeve is connected to the top surface of the base plate, the top end of the sleeve is provided with a connecting hole, the bottom end of the telescopic rod is movably placed in the connecting hole, the fastening screw is inserted into the through hole of the side wall at the movably connected part of the sleeve and the telescopic rod, and the fastening screw is detachably connected to the sleeve and the telescopic rod.

[0017] In some embodiments, the method further comprises: a compass, wherein the compass is sleeved on the outer periphery of the top end of the sleeve.

[0018] In some embodiments, the invention further comprises: a level bubble, wherein the level bubble is arranged on the outer wall of the telescopic rod.

[0019] In some embodiments, the angle indicator is an arc-shaped scale, the horizontal side of the arc-shaped scale is vertically attached to the outer side of the top of the leveling base, the zero scale point of the arc-shaped scale is on the same horizontal line as the rotational connection between the laser and the leveling base, and the arc side of the arc-shaped scale has slope scale lines.

[0020] In a second aspect, a method for using the aforementioned device for measuring the slope of a roadbed slope is provided, the method comprising the following steps:

[0021] Place the leveling base at the foot of the roadbed slope to be measured, and align the laser of the measuring assembly with the slope measurement direction of the roadbed slope to be measured;

[0022] Using the angle indicator of the measuring assembly, the laser emits a laser line parallel to the theoretical slope line of the roadbed slope to be measured;

[0023] According to the height of the laser line marked on the tower ruler at each checkpoint, the height difference between the actual slope and the theoretical slope at each checkpoint of the roadbed slope to be measured is calculated, and the actual slope is adjusted to the theoretical slope according to the height difference.

[0024] In some embodiments, placing the leveling base at the foot of the roadbed slope to be measured and aligning the laser of the measuring assembly with the slope measurement direction of the roadbed slope to be measured comprises the following steps:

[0025] Place the leveling base at the foot of the roadbed slope to be measured;

[0026] Adjust the leveling base so that the top of the leveling base is perpendicular to the horizontal plane;

[0027] Adjust the left and right direction of the laser so that the laser is aligned with the slope measurement direction of the roadbed slope to be measured.

[0028] In some embodiments, the method of using the angle indicator of the measuring assembly to make the laser emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured includes the following steps:

[0029] Use the angle indicator of the measuring assembly to adjust the up and down direction of the laser;

[0030] Start the laser and make the laser line emitted by the laser parallel to the theoretical slope line of the roadbed slope to be measured, so as to mark the height on the tower ruler corresponding to each check point.

[0031] The beneficial effects brought about by the technical solution provided by the present invention include:

[0032] The embodiment of the present invention provides a measuring device and a method for using the slope of a roadbed slope. The measuring device includes a leveling base and a measuring assembly. The leveling base is used to be arranged at the foot of the roadbed slope to be measured. The measuring assembly includes a laser, an angle indicator and a plurality of tower rulers. One end of the laser is rotatably connected to the top of the leveling base. The angle indicator is arranged at the top of the leveling base and on one side of the laser. The laser is used to emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured using the angle indicator. A plurality of tower rulers are arranged at corresponding vertical intervals along the laser line at each checkpoint of the roadbed slope to be measured. The present invention uses a leveling base and a measuring assembly to mark a laser line parallel to the theoretical slope line of the roadbed slope to be measured on the tower ruler of the measuring assembly, so as to facilitate the rapid acquisition of the deviation between the actual slope and the theoretical slope of the roadbed slope to be measured, thereby improving the measurement efficiency of the roadbed slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A first schematic diagram of a device for measuring the slope of a roadbed slope provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the operation of a device for measuring the slope of a roadbed slope provided by an embodiment of the present invention;

[0036] Figure 3 A flow chart of a practical method for measuring the slope of a roadbed slope provided by an embodiment of the present invention;

[0037] Reference numerals:

[0038] 1. Leveling base; 11. Base plate; 12. Telescopic sleeve; 121. Casing; 1211. Connecting hole; 122. Telescopic rod; 123. Fastening screw; 13. Leveling screw;

[0039] 2. Measuring components; 21. Laser; 22. Angle indicator; 23. Tower ruler;

[0040] 3. Compass;

[0041] 4. Horizontal bubble. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The embodiment of the present invention provides a device for measuring the slope of a roadbed slope and a method for using the device, which can solve the technical problem that the prior art requires professional surveying technicians to operate professional instruments, resulting in low measurement efficiency.

[0044] See also Figure 1 and Figure 2 As shown, a device for measuring the slope of a roadbed slope provided by an embodiment of the present invention is provided with a leveling base 1 and a measuring component 2.

[0045] The leveling base 1 is used to be set at the foot of the roadbed slope to be measured, and the measuring component 2 is provided with a laser 21, an angle indicator 22 and a plurality of tower rulers 23. One end of the laser 21 is rotatably connected to the top of the leveling base 1, and the angle indicator 22 is arranged at the top of the leveling base 1 and located on one side of the laser 21. The laser 21 is used to use the angle indicator 22 to emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured, and a plurality of tower rulers 23 are arranged at corresponding vertical intervals along the laser line at each inspection point of the roadbed slope to be measured. The present invention uses a leveling base and a measuring component to mark a laser line parallel to the theoretical slope line of the roadbed slope to be measured on the tower ruler of the measuring component, so as to facilitate the rapid acquisition of the deviation between the actual slope and the theoretical slope of the roadbed slope to be measured, thereby improving the measurement efficiency of the roadbed slope slope.

[0046] An embodiment of the present invention provides a device for measuring the slope of a roadbed slope. The device is provided with a leveling base and a measuring assembly. The leveling base is used to be arranged at the foot of the roadbed slope to be measured. The measuring assembly is provided with a laser, an angle indicator and a plurality of tower rulers. One end of the laser is rotatably connected to the top of the leveling base. The angle indicator is arranged at the top of the leveling base and located on one side of the laser. The laser is used to emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured using the angle indicator. A plurality of tower rulers are arranged at corresponding vertical intervals along the laser line at each checkpoint of the roadbed slope to be measured. The present invention uses a leveling base and a measuring assembly to mark a laser line parallel to the theoretical slope line of the roadbed slope to be measured on the tower ruler of the measuring assembly, so as to facilitate the rapid acquisition of the deviation between the actual slope and the theoretical slope of the roadbed slope to be measured, thereby improving the measurement efficiency of the roadbed slope.

[0047] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the leveling base 1 is provided with a base plate 11 and a telescopic sleeve 12, the bottom surface of the base plate 11 is used to be connected to the foot of the roadbed slope to be measured, the bottom end of the telescopic sleeve 12 is connected to the top surface of the base plate 11, and one end of the laser 21 is rotatably connected to the top end of the telescopic sleeve 12. In this embodiment, a hinge seat is provided at the top center of the telescopic sleeve 12, and the hinge seat is hingedly connected to the laser 21 so that the laser 21 can rotate up and down around the hinge seat. After the laser 21 is adjusted into place, a fixing screw is used to fix the laser 21 and the hinge seat to fix the position of the laser 21. In the present embodiment, the laser 21 is a long strip laser, one end of which is rotatably connected to the top end of the telescopic sleeve 12, and when the long strip laser is parallel to the ground, the laser line emitted by the long strip laser is on the extension line of the zero scale line of the angle indicator, and the long strip laser is adjusted to the same angle as the ideal slope value to improve the convenience of angle reading.

[0048] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, the leveling base 1 is also provided with a plurality of leveling screws 13, which are evenly arranged around the outer periphery of the telescopic sleeve 12, and the bottom end of each leveling screw 13 is detachably connected to the base plate 11. After the roadbed slope measuring device is set up at the foot of the roadbed slope to be measured, the plurality of leveling screws on the base plate 11 are adjusted to level the telescopic sleeve 12 so that the telescopic sleeve 12 is perpendicular to the horizontal plane. In this embodiment, the number of the leveling screws 13 is three, and the three leveling screws 13 are evenly distributed around the base plate 11, which are used to fix the base plate and level the telescopic sleeve, thereby improving the stability of the measuring device and the accuracy of the measurement data.

[0049] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the telescopic sleeve rod 12 is provided with a sleeve 121, a telescopic rod 122 and a fastening screw 123. The bottom end of the sleeve 121 is connected to the top surface of the base plate 11. The top end of the sleeve 121 is provided with a connecting hole 1211. The bottom end of the telescopic rod 122 is movably placed in the connecting hole 1211. The fastening screw 123 penetrates into the through hole of the side wall of the movably connected part of the sleeve 121 and the telescopic rod 122. The fastening screw 123 is detachably connected to the sleeve 121 and the telescopic rod 122. In this embodiment, the sleeve 121 is in the shape of a circular tube and is vertically fixed on the base plate 11. The telescopic rod 122 is in the shape of a circular tube. The outer diameter of the telescopic rod 122 matches the inner diameter of the sleeve 121. The telescopic rod 122 can be telescopically moved along the sleeve 121 and is fastened together with the sleeve 121 by the fastening screw 123. The sleeve, telescopic rod and fastening screw cooperate to facilitate the adjustment of the height of the measuring device to adapt to different measuring environments and improve the applicability of the measuring device.

[0050] As an optional implementation, in an embodiment of the invention, see Figure 1As shown, a compass 3 is also provided, and the compass 3 is sleeved on the outer periphery of the top end of the sleeve 121. The compass 3 is fixed to the top end of the sleeve 121 of the telescopic sleeve rod 12, and a scale and a compass are provided on the compass 3. The horizontal position of the telescopic rod 122 of the telescopic sleeve rod 12 and the horizontal position of the laser 21 are determined in conjunction with the scale and the compass on the compass 3. During measurement, the telescopic rod 122 of the telescopic sleeve rod 12 is rotated according to the scale and the compass on the compass 3, so that the laser 21 of the roadbed slope measuring device is aligned with the measuring direction of the roadbed slope to be measured. The compass 3 facilitates all-round measurement of the height difference between the actual slope and the theoretical slope of the roadbed slope to be measured, greatly improving the coverage of the measurement work. The roadbed slope measuring device is installed once, and the height difference between the actual slope and the theoretical slope of the roadbed slope to be measured in multiple directions of the roadbed can be checked, which greatly improves the measurement efficiency of the roadbed slope.

[0051] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, a level bubble 4 is also provided, and the level bubble 4 is provided on the outer wall of the telescopic rod 122. The level bubble 4 cooperates with the leveling base 1 to mark the verticality of the telescopic rod 122 of the telescopic sleeve rod 12. Before measurement, the roadbed slope measuring device is set up at the foot of the roadbed slope to be measured, and the multiple leveling screws 13 of the leveling base 1 are adjusted to center the level bubble 4 of the telescopic sleeve rod 12, and the telescopic sleeve rod 12 is leveled to improve the measurement accuracy of the roadbed slope measuring device.

[0052] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the angle indicator 22 is an arc-shaped scale, the horizontal side of the arc-shaped scale is vertically attached to the outer side of the top of the leveling base 1, and the zero scale point of the arc-shaped scale is on the same horizontal line as the rotation connection between the laser 21 and the leveling base 1, and the arc side of the arc-shaped scale has a slope scale line.

[0053] The present invention also provides a method for using the device for measuring the slope of a roadbed. Figure 3 As shown, the following steps are included:

[0054] Step S10: placing the leveling base at the foot of the roadbed slope to be measured, and aligning the laser of the measuring assembly with the slope measurement direction of the roadbed slope to be measured;

[0055] Specifically, the leveling base is placed at the foot of the roadbed slope to be measured, the leveling screws are adjusted, the telescopic rod is leveled, and the laser is aligned with the slope measurement direction of the roadbed slope to be measured.

[0056] Step S20: using the angle indicator of the measuring assembly to make the laser emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured;

[0057] Specifically, the angle indicator is used to adjust the laser to emit a laser line parallel to the theoretical slope line according to the theoretical slope line.

[0058] Step S30: Calculate the height difference between the actual slope and the theoretical slope of each checkpoint of the roadbed slope to be measured according to the height of the laser line marked on the tower ruler at each checkpoint, and adjust the actual slope to the theoretical slope according to the height difference.

[0059] Specifically, according to the height L indicated by the laser line on each tower ruler i , L j , calculate the height difference between the theoretical slope and the actual slope of each checkpoint of the roadbed slope to be measured, and adjust the actual slope to the theoretical slope according to the height difference.

[0060] As an optional implementation, in one embodiment of the invention, the leveling base is placed at the foot of the roadbed slope to be measured, and the laser of the measuring assembly is aligned with the slope measurement direction of the roadbed slope to be measured, and the following steps are provided:

[0061] Step S11: placing the leveling base at the foot of the roadbed slope to be measured;

[0062] Specifically, see Figure 2 As shown, the leveling base is placed at the foot of the roadbed slope to be measured so that the laser line can accurately mark the laser line parallel to the ideal slope line.

[0063] Step S12: adjusting the leveling base so that the top of the leveling base is perpendicular to the horizontal plane;

[0064] Specifically, adjusting the leveling base so that the top end of the leveling base is perpendicular to the horizontal plane facilitates improving the measurement accuracy.

[0065] Step S13: Adjust the left and right direction of the laser so that the laser is aligned with the slope measurement direction of the roadbed slope to be measured.

[0066] As an optional implementation, in one embodiment of the invention, the angle indicator of the measuring assembly is used to make the laser emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured, and the following steps are provided:

[0067] Step S21: using the angle indicator of the measuring assembly to adjust the up and down direction of the laser;

[0068] Step S22: Start the laser so that the laser line emitted by the laser is parallel to the theoretical slope line of the roadbed slope to be measured, so as to mark the height on the tower ruler corresponding to each checkpoint;

[0069] Specifically, the height of the measuring device for the roadbed slope, i.e., the distance from the center of the hinge seat to the slope foot point, is H, and the vertical distances from the two inspection points of the roadbed slope to be measured to the laser line are L and L, respectively. i and L j , then the actual height difference between the two checkpoints of the roadbed slope to be measured and its theoretical slope line is:

[0070] ε i =HL i

[0071] ε j =HL j

[0072] According to the actual height difference ε between the two check points of the roadbed slope to be measured and its theoretical slope line i , ε j , adjust the slope of the roadbed slope to be measured at the two checkpoints so that it meets the slope requirements of the ideal roadbed slope.

[0073] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0074] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0075] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A device for measuring the slope of a roadbed, characterized in that: include: A leveling base (1), the leveling base (1) being arranged at the foot of a roadbed slope to be measured; A measuring component (2), the measuring component (2) comprising: A laser (21), one end of the laser (21) being rotatably connected to the top end of the leveling base (1); An angle indicator (22), the angle indicator (22) being arranged at the top of the leveling base (1) and located on one side of the laser (21), the laser (21) being used to use the angle indicator (22) to emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured A plurality of tower rulers (23) are arranged at corresponding vertical intervals along the laser line at each inspection point of the roadbed slope to be measured.

2. A roadbed slope measuring device according to claim 1, characterized in that: The leveling base (1) comprises: a base plate (11) and a telescopic sleeve rod (12); The bottom surface of the base plate (11) is used to be connected to the foot of the roadbed slope to be measured, the bottom end of the telescopic sleeve (12) is connected to the top surface of the base plate (11), and one end of the laser (21) is rotatably connected to the top end of the telescopic sleeve (12).

3. A roadbed slope measuring device according to claim 2, characterized in that: The leveling base (1) further comprises: a plurality of leveling screws (13); A plurality of leveling screws (13) are arranged around the telescopic sleeve rod (12), and the bottom end of each leveling screw (13) is detachably connected to the base plate (11).

4. A device for measuring the slope of a roadbed according to claim 2, characterized in that: The telescopic sleeve rod (12) comprises: a sleeve (121), a telescopic rod (122) and a fastening screw (123); The bottom end of the sleeve (121) is connected to the top surface of the base plate (11); a connection hole (1211) is provided at the top end of the sleeve (121); the bottom end of the telescopic rod (122) is movably placed in the connection hole (1211); the fastening screw (123) is inserted into a through hole on a side wall of a movably connected portion between the sleeve (121) and the telescopic rod (122); and the fastening screw (123) is detachably connected to the sleeve (121) and the telescopic rod (122).

5. A device for measuring the slope of a roadbed according to claim 4, characterized in that: Also includes: A compass (3), wherein the compass (3) is sleeved on the outer periphery of the top end of the sleeve (121).

6. A roadbed slope measuring device according to claim 4, characterized in that: Also includes: A level bubble (4), wherein the level bubble (4) is arranged on the outer wall of the telescopic rod (122).

7. The device for measuring the slope of a roadbed according to claim 1, characterized in that: The angle indicator (22) is an arc-shaped scale, the horizontal side of the arc-shaped scale is vertically attached to the outer side of the top of the leveling base (1), the zero scale point of the arc-shaped scale is on the same horizontal line as the rotation connection between the laser (21) and the leveling base (1), and the arc side of the arc-shaped scale has a slope scale line.

8. A method for using the device for measuring the slope of a roadbed slope according to claim 1, characterized in that: The following steps are involved: Place the leveling base at the foot of the roadbed slope to be measured, and align the laser of the measuring assembly with the slope measurement direction of the roadbed slope to be measured; Using the angle indicator of the measuring assembly, the laser emits a laser line parallel to the theoretical slope line of the roadbed slope to be measured; According to the height of the laser line marked on the tower ruler at each checkpoint, the height difference between the actual slope and the theoretical slope at each checkpoint of the roadbed slope to be measured is calculated, and the actual slope is adjusted to the theoretical slope according to the height difference.

9. The method for using the device for measuring the slope of a roadbed slope according to claim 8, characterized in that: The method of placing the leveling base at the foot of the roadbed slope to be measured and aligning the laser of the measuring assembly with the slope measurement direction of the roadbed slope to be measured comprises the following steps: Place the leveling base at the foot of the roadbed slope to be measured; Adjust the leveling base so that the top of the leveling base is perpendicular to the horizontal plane; Adjust the left and right direction of the laser so that the laser is aligned with the slope measurement direction of the roadbed slope to be measured.

10. The method for using the device for measuring the slope of a roadbed slope according to claim 8, characterized in that: The method of using the angle indicator of the measuring assembly to make the laser emit a laser line parallel to the theoretical slope line of the roadbed slope to be measured includes the following steps: Use the angle indicator of the measuring assembly to adjust the up and down direction of the laser; Start the laser and make the laser line emitted by the laser parallel to the theoretical slope line of the roadbed slope to be measured, so as to mark the height on the tower ruler corresponding to each check point.

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