Position measuring device for civil construction

Abstract

The invention discloses a position measuring device for civil engineering construction. The position measuring device comprises a mounting seat, a horizontal mechanism, a positioning mechanism and a positioning mechanism, the horizontal mechanism comprises a support which is rotatably mounted on the mounting seat and can be locked, a cross plate is movably mounted at the inner top of the support, four counterweight balls are movably mounted at the bottom of the cross plate, a mounting frame is fixed at the bottom of the cross plate, and the laser range finder is mounted in the mounting frame and is clamped and fixed; when the laser range finder is located in the installation frame, the laser range finder is not affected by the installation base, and the laser range finder is adjusted in a self-adaptive mode and is in a horizontal state in cooperation with the cross plate and the balance weight ball. According to the invention, the cross plate capable of rotating in multiple directions and the counterweight ball are arranged, so that automatic horizontal calibration of the cross plate and the laser range finder can be realized, measurement personnel need to adjust for multiple times during multiple and multi-position measurement, the measurement efficiency is improved, and the labor amount of the measurement personnel is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a position measuring device for civil engineering construction. Background Art

[0002] The design principle of the laser rangefinder enables it to provide the most accurate measurement results when it is in a horizontal state. When the instrument is not in a horizontal state, due to the influence of gravity, the optical system and the internal measurement mechanism, the emission angle of the laser beam may deviate, thus affecting the accuracy of the measurement results. Therefore, in order to ensure the reliability of the measurement data, the laser rangefinder must be adjusted to a horizontal state.

[0003] The measurement work in civil construction requires extremely high accuracy, because any slight deviation may lead to structural safety and quality problems of the entire project. Therefore, the measuring instruments used in civil construction, including laser rangefinders, must meet strict accuracy requirements. Adjusting the laser rangefinder to a horizontal state is an important step to ensure that it meets the accuracy requirements of civil construction.

[0004] During the civil construction process, it is necessary to measure the length or area, and the measurement work usually needs to be carried out multiple times to monitor the progress and quality of the project. If the laser rangefinder is not in a horizontal state during each measurement, a certain error will be introduced in each measurement. These errors will gradually accumulate after multiple measurements, and eventually lead to a large deviation between the measurement result and the actual value. Therefore, in order to avoid the accumulation of measurement errors, the laser rangefinder must be adjusted to a horizontal state before each measurement. Adjustment is required every time a position is changed for measurement, which will greatly reduce the efficiency of the measurement and increase the workload of the surveyor.

[0005] To this end, the present application proposes a position measuring device for civil construction. Summary of the invention

[0006] The purpose of the present invention is to solve the above technical problems and to propose a position measuring device for civil construction.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A position measuring device for civil construction, comprising a mounting base that can be connected to a tripod support: Laser rangefinders for measuring distance; A horizontal mechanism; the horizontal mechanism comprises a bracket rotatably mounted on a mounting seat and capable of being locked, a cross plate movably mounted on the inner top of the bracket, four counterweight balls movably mounted on the bottom of the cross plate, a mounting frame fixed to the bottom of the cross plate, the laser rangefinder mounted in the mounting frame and clamped and fixed; when the laser rangefinder is located in the mounting frame, it is not affected by the mounting seat, and cooperates with the cross plate and the counterweight balls to enable the laser rangefinder to be adaptively adjusted and in a horizontal state.

[0008] Preferably, a damping shaft is mounted on the mounting seat, and the bracket is mounted on the upper end of the damping shaft.

[0009] Preferably, a first round rod is fixed to the inner top of the bracket, a first connecting ball is fixedly connected to the bottom of the first round rod, an outer sleeve of the first connecting ball is provided with a ball sleeve movably connected to the first connecting ball, the ball sleeve passes through the cross plate and is fixedly connected to the cross plate, and a coaxially arranged first soot blowing channel is passed through the first round rod and the first connecting ball.

[0010] Preferably, a second round rod is fixed to the bottom of the cross plate, a second connecting ball is fixed to the bottom of the second round rod, a ball groove is provided at the upper end of the counterweight ball, the second connecting ball is movably connected in the ball groove, and a coaxially arranged second sootblowing channel is penetrated through the second round rod and the second connecting ball.

[0011] Preferably, a first piston cylinder is fixedly connected to the inner top of the mounting frame, a first air inlet pipe is installed on the first piston cylinder, a first one-way valve is installed on the first air inlet pipe, a first movable piston is slidably connected in the first piston cylinder, a first spring is fixedly connected to the first movable piston, the other end of the first spring is connected to the first piston cylinder, a movable rod is fixedly connected to the bottom of the first movable piston, a clamping plate is fixed to the bottom of the movable rod, rubber pads are fixed to the bottom of the clamping plate and the inner bottom of the mounting frame, and the laser rangefinder is located between the two rubber pads and abuts against each other.

[0012] Preferably, it also includes an air supply mechanism capable of supplying air to the first sootblowing channel and the second sootblowing channel, the air supply mechanism includes an airbag fixed on the top of the first piston cylinder, the airbag is fixedly connected to the first movable piston, a second air inlet pipe is installed on the airbag, a second one-way valve is installed on the second air inlet pipe, an air supply pipe that runs through the first piston cylinder is fixed on the airbag, the air supply pipe runs through the first round rod and is connected to the first sootblowing channel, a delivery pipe that is connected to the first sootblowing channel is fixedly installed on the first round rod, and the delivery pipe is connected to the second sootblowing channel.

[0013] Preferably, it also includes a retractable sun visor, the bracket is provided with a storage groove, the sun visor is slidably connected in the storage groove, two second piston cylinders fixedly connected thereto are embedded in the sun visor, a second movable piston is slidably connected in the second piston cylinder, a second spring is fixed on the second movable piston, the other end of the second spring is fixedly connected to the second piston cylinder, a pull rod is fixed on the second movable piston, the pull rod is fixedly connected to the inner wall of the storage groove, and the two second piston cylinders are connected to the first piston cylinder through a Y-type hose.

[0014] Preferably, a baffle is fixed to the inner wall of the installation frame, and when the laser rangefinder is installed in the installation frame, the laser rangefinder abuts against the baffle.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The upward movement of the first movable piston can transport the air in the first piston cylinder to the two second piston cylinders through the Y-type hose. As the air in the second piston cylinder increases and the pressure is greater than the elastic force of the second spring, the second piston cylinder and the second movable piston will be driven to move relative to each other. Since the pull rod is fixed, the second movable piston is stationary, so the second piston cylinder and the sun visor can be driven to move and extend out of the storage slot. The sun visor has a sunshade effect, so it is convenient for the surveyor to see the display screen on the laser rangefinder.

[0016] 2. Under the action of the elastic force of the first spring and the pulling force of the second spring, the first movable piston can move downward, and the downward movement of the first movable piston drives the movable rod and the clamping plate to move downward. Finally, the rubber pad at the bottom of the clamping plate abuts against the upper end of the laser rangefinder, thereby clamping and positioning the laser rangefinder.

[0017] 3. The upward movement of the first movable piston will squeeze the airbag, and the air in the airbag will be transported to the first soot blowing channel and the second soot blowing channel through the air supply pipe. The air will flow upward from the bottom of the ball sleeve and be discharged through the gap between the first connecting ball and the ball sleeve, which can clean the dust in the ball sleeve and the ball slot to prevent dust from entering the ball slot and affecting the activities of the two. No manual cleaning is required, and the service life of the device can be increased.

[0018] 4. Since the mounting base is located on a horizontal table, the laser rangefinder is also in a horizontal state at this time, so the lower part of the cross plate is similar to an inverted "tumbler". Finally, under the action of the counterweight ball, the cross plate is in a horizontal state, and then the laser rangefinder is also in a horizontal position at this time, and there is no need to adjust the laser rangefinder horizontally.

[0019] 5. When moving to other locations for measurement, you only need to stably support the tripod on the ground. The counterweight ball will change accordingly as the angle of the bracket changes, so that the laser rangefinder always remains horizontal.

[0020] 6. When the rotating bracket rotates with the damping shaft, the inclination of the counterweight ball changes, and it can adjust itself by gravity. Therefore, when the rotating bracket is rotated to drive the laser rangefinder to measure the length in other directions, there is no need to adjust the level of the laser rangefinder.

[0021] 7. Two bolts can be threadedly installed on the installation frame, the present invention can be placed on a horizontal table, laser rangefinders of different models can be placed in the installation frame, the laser rangefinder can be adjusted until the installation frame is horizontal, and the rotating bolts can be abutted against the laser rangefinder, thus limiting a space for the laser rangefinder of this model, and automatic leveling can be achieved each time it is placed in this position.

[0022] In summary, the present invention is provided with a cross plate and a counterweight ball that can rotate in multiple directions, which can realize automatic horizontal calibration of the cross plate and the laser rangefinder. When performing multiple and multi-position measurements, the surveyor needs to make multiple adjustments, which improves the measurement efficiency and reduces the workload of the surveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a position measurement device for civil construction proposed by the present invention; Figure 2 This is a rear view of a position measuring device for civil construction proposed by the present invention; Figure 3 A cross-sectional view of a second piston cylinder in a position measuring device for civil construction proposed by the present invention; Figure 4 This is a schematic diagram of the disassembly of the second piston cylinder in a position measuring device for civil construction proposed by the present invention; Figure 5 This is a structural schematic diagram of an installation frame in a position measurement device for civil construction proposed by the present invention; Figure 6 This is a schematic diagram of the structure of a counterweight ball in a position measurement device for civil construction proposed by the present invention; Figure 7 This is a schematic diagram of the disassembly of the first piston cylinder in a position measuring device for civil construction proposed by the present invention.

[0024] In the figure: 1 mounting seat, 2 damping shaft, 3 bracket, 4 sun visor, 5 mounting frame, 6 laser rangefinder, 7 baffle, 8 rubber pad, 9 cross plate, 10 storage groove, 11 first piston cylinder, 12 second piston cylinder, 13 second spring, 14 pull rod, 15 second movable piston, 16 first round rod, 17 first soot blowing channel, 18 first connecting ball, 19 second round rod, 20 counterweight ball, 21 Y-type hose, 22 conveying pipe, 23 air supply pipe, 24 first air inlet pipe, 25 first one-way valve, 26 second connecting ball, 27 second soot blowing channel, 28 movable rod, 29 first movable piston, 30 air bag, 31 second air inlet pipe, 32 second one-way valve, 33 first spring, 34 ball sleeve, 35 ball groove, 36 clamping plate. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Reference Figure 1-Figure 7 A position measuring device for civil construction includes a mounting base 1 that can be connected to a tripod bracket. The mounting base 1 can be fixed with a buckle or a through hole, etc., and can be connected to the tripod bracket in a quick way.

[0027] Laser rangefinder for measuring distance 6; Horizontal mechanism; the horizontal mechanism includes a bracket 3 which is rotatably mounted on a mounting base 1 and can be locked, a damping shaft 2 is mounted on the mounting base 1, and the bracket 3 is mounted on the upper end of the damping shaft 2. The bracket 3 can be rotated by the damping shaft 2, and the bracket 3 can be positioned after rotation.

[0028] The bracket 3 includes a bottom plate, four support columns are fixed on the bottom plate, an upper plate is fixed on the upper ends of the four support columns, and the bottom plate, the support columns and the upper plate can be integrally formed; wherein the storage slot 10 is arranged on the upper plate.

[0029] A cross plate 9 is movably installed on the inner top of the bracket 3, and a first round rod 16 is fixed on the inner top of the bracket 3. The bottom of the first round rod 16 is fixedly connected to a first connecting ball 18, and the outer sleeve of the first connecting ball 18 is provided with a ball sleeve 34 movably connected to it. The ball sleeve 34 passes through the cross plate 9 and is fixedly connected to it. A coaxially arranged first soot blowing channel 17 is penetrated through the first round rod 16 and the first connecting ball 18, so that the cross plate 9 can rotate in multiple directions. A polyfluoro film can be provided on the outer wall of the first connecting ball 18 and the inner wall of the ball sleeve 34 to make the rotation smoother. Among them, the spherical groove on the ball sleeve 34 is larger than half a circle, so that the first connecting ball 18 will not fall off the ball sleeve 34.

[0030] Four counterweight balls 20 are movably installed at the bottom of the cross plate 9, a second round rod 19 is fixed at the bottom of the cross plate 9, a second connecting ball 26 is fixed at the bottom of the second round rod 19, a ball groove 35 is provided at the upper end of the counterweight ball 20, the second connecting ball 26 is movably connected in the ball groove 35, and a coaxially arranged second sootblowing channel 27 is penetrated through the second round rod 19 and the second connecting ball 26; wherein, the arrangement of the ball groove 35 and the second connecting ball 26 is the same as the arrangement of the ball sleeve 34 and the first connecting ball 18.

[0031] A mounting frame 5 is fixed to the bottom of the cross plate 9, and the laser rangefinder 6 is installed in the mounting frame 5 and is clamped and fixed; a first piston cylinder 11 is fixedly connected to the inner top of the mounting frame 5, a first air inlet pipe 24 is installed on the first piston cylinder 11, a first one-way valve 25 is installed on the first air inlet pipe 24, and the first one-way valve 25 only allows air to enter the first piston cylinder 11 through the first air inlet pipe 24; a first movable piston 29 is slidably connected in the first piston cylinder 11, a first spring 33 is fixedly connected to the first movable piston 29, and the other end of the first spring 33 is connected to the first piston cylinder 11, a movable rod 28 is fixedly connected to the bottom of the first movable piston 29, a clamping plate 36 is fixed to the bottom of the movable rod 28, a rubber pad 8 is fixed to the bottom of the clamping plate 36 and the inner bottom of the mounting frame 5, and the laser rangefinder 6 is located between the two rubber pads 8 and abuts against each other.

[0032] Among them, a baffle 7 is fixed to the inner wall of the installation frame 5. When the laser rangefinder 6 is installed in the installation frame 5, the laser rangefinder 6 is against the baffle 7. If the mounting base 1 is located on a horizontal table, the laser rangefinder 6 is also in a horizontal state at this time.

[0033] When the laser rangefinder 6 is located in the installation frame 5, it is not affected by the installation seat 1. The laser rangefinder 6 is adaptively adjusted and in a horizontal state in cooperation with the cross plate 9 and the counterweight ball 20.

[0034] It also includes an air supply mechanism capable of delivering air to the first sootblowing channel 17 and the second sootblowing channel 27, the air supply mechanism includes an airbag 30 fixed on the top of the first piston cylinder 11, the airbag 30 is fixedly connected to the first movable piston 29, a second air inlet pipe 31 is installed on the airbag 30, a second one-way valve 32 is installed on the second air inlet pipe 31, the second one-way valve 32 only allows air to enter the airbag 30 through the second air inlet pipe 31; an air supply pipe 23 is fixed on the airbag 30 and is arranged through the first piston cylinder 11, the air supply pipe 23 passes through the first round rod 16 and is connected to the first sootblowing channel 17, a delivery pipe 22 connected to the first sootblowing channel 17 is fixedly installed on the first round rod 16, and the delivery pipe 22 is connected to the second sootblowing channel 27.

[0035] It also includes a retractable sun visor 4, a receiving groove 10 is provided on the bracket 3, the sun visor 4 is slidably connected in the receiving groove 10, two second piston cylinders 12 fixedly connected thereto are embedded on the sun visor 4, a second movable piston 15 is slidably connected in the second piston cylinder 12, a second spring 13 is fixed on the second movable piston 15, the other end of the second spring 13 is fixedly connected to the second piston cylinder 12, a pull rod 14 is fixed on the second movable piston 15, the pull rod 14 is fixedly connected to the inner wall of the receiving groove 10, and the two second piston cylinders 12 are connected to the first piston cylinder 11 through a Y-type hose 21.

[0036] When the present invention is used, the tripod is placed on the ground without the need for precise horizontal adjustment of the tripod, and then the present invention is installed on the tripod; The measurement personnel push the clamping plate 36 upwards by hand, and the upward movement of the clamping plate 36 drives the moving rod 28 and the first moving piston 29 to move upwards. The upward movement of the first moving piston 29 can transport the air in the first piston cylinder 11 to the two second piston cylinders 12 through the Y-shaped hose 21. As the air in the second piston cylinder 12 increases and the pressure is greater than the elastic force of the second spring 13, the second piston cylinder 12 and the second moving piston 15 are driven to move relative to each other. Since the pull rod 14 is fixed and the second moving piston 15 is stationary, the second piston cylinder 12 and the sun visor 4 can be driven to move and extend out of the storage groove 10. The upward movement of the first movable piston 29 will squeeze the airbag 30, and the air in the airbag 30 will be transported to the first soot blowing channel 17 through the air supply pipe 23. Part of the air will be blown into the ball sleeve 34 through the first soot blowing channel 17, and the air will flow upward from the bottom of the ball sleeve 34 and be discharged through the gap between the first connecting ball 18 and the ball sleeve 34. In this way, the dust between the first connecting ball 18 and the ball sleeve 34 and the dust at the connection can be cleaned to prevent dust from entering between the first connecting ball 18 and the ball sleeve 34 and affecting the movement; part of the air is transported to the second soot blowing channel 27 through the four conveying pipes 22, and finally blown into the ball groove 35. As mentioned above, the dust in the ball groove 35 can be cleaned to prevent dust from entering the ball groove 35 and affecting the movement of the two. No manual cleaning is required, and the service life of the device can also be increased. Then the surveyor places the laser rangefinder 6 on the rubber pad 8 at the bottom and abuts against the baffle 7, and then loosens the clamping plate 36. The above operation compresses the first spring 33 and stretches the second spring 13. Under the elastic force of the first spring 33 and the pulling force of the second spring 13, the first movable piston 29 can move downward, and the downward movement of the first movable piston 29 drives the movable rod 28 and the clamping plate 36 to move downward. Finally, the rubber pad 8 at the bottom of the clamping plate 36 abuts against the upper end of the laser rangefinder 6 to achieve the clamping and positioning of the laser rangefinder 6. At this time, the sun visor 4 is still in the extended state. When the hand of the surveyor no longer interferes with the mounting frame 5, the tripod is not in a horizontal state, so it is affected by the four weighted balls 20. At this time, the first connecting ball 18 and the ball sleeve 34 move relative to each other. Since the mounting seat 1 is located on a horizontal table, the laser rangefinder 6 is also in a horizontal state at this time. Therefore, the lower part of the cross plate 9 is similar to an inverted "tumbler". Finally, under the action of the weighted balls 20, the cross plate 9 is in a horizontal state, and then the laser rangefinder 6 is also in a horizontal position at this time, and there is no need to adjust the laser rangefinder 6 horizontally. Since the sun visor 4 is located outside the storage slot 10, the sun visor 4 plays a shading effect, so it is convenient for the measurement personnel to see the display screen on the laser rangefinder 6; It should be noted that when the surveyor holds the bracket 3, the tripod bracket is offset, and the weight ball 20 will change accordingly due to the change in the angle of the bracket 3, so that the laser rangefinder 6 always remains in a horizontal state; When it is transferred to another location for measurement, it is sufficient to stably support the tripod on the ground. The weight ball 20 will change accordingly due to the change of the angle of the bracket 3, so that the laser rangefinder 6 always remains in a horizontal state; When the rotating bracket 3 rotates with the damping shaft 2, the inclination of the counterweight ball 20 changes, and it can adjust itself using gravity. Therefore, when the rotating bracket 3 is rotated to drive the laser rangefinder 6 to measure the length in other directions, there is no need to adjust the level of the laser rangefinder 6.

[0037] After use, the surveyor removes the laser rangefinder 6, and under the elastic force of the first spring 33 and the pulling force of the second spring 13, the clamping plate 36 is reset. Under the action of the second spring 13, the air in the second piston cylinder 12 first enters the first piston cylinder 11 until the sun visor 4 is reset; The first movable piston 29 is reset to stretch and reset the airbag 30. Since the air resistance when air enters the airbag 30 through the first soot blowing channel 17 and the second soot blowing channel 27 is large, the second one-way valve 32 is opened, and the air in the first piston cylinder 11 enters the airbag 30 through the second air inlet pipe 31. Correspondingly, the air in the first piston cylinder 11 is reduced, and the external air enters the first piston cylinder 11 through the first air inlet pipe 24, and finally it is completely reset for the next use.

[0038] In summary, the present application is provided with a cross plate 9 and a counterweight ball 20 that can rotate in multiple directions, which can realize automatic horizontal calibration of the cross plate 9 and the laser rangefinder 6. When performing multiple and multi-position measurements, the surveyor needs to make multiple adjustments, which improves the measurement efficiency and reduces the workload of the surveyor.

[0039] It should be noted that the present application only uses a single model of laser rangefinder 6. Since different models of laser rangefinders 6 have different weights, when placed in the installation frame 5, the installation frame 5 will tilt due to gravity.

[0040] Therefore, another embodiment can be set, specifically: Two bolts can be threadedly installed on the mounting frame 5, the present invention is placed on a horizontal table, laser rangefinders 6 of different models are placed in the mounting frame 5, the laser rangefinder 6 is adjusted until the mounting frame 5 is horizontal, and the rotating bolts are against the laser rangefinder 6, so that a space is limited for the laser rangefinder 6 of the model, and automatic leveling can be achieved each time it is placed in this position.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A position measuring device for civil construction, comprising a mounting base (1) that can be connected to a tripod support, characterized in that: Laser rangefinder for measuring distance (6); A horizontal mechanism; the horizontal mechanism comprises a bracket (3) rotatably mounted on a mounting seat (1) and capable of being locked; a cross plate (9) is movably mounted on the inner top of the bracket (3); four counterweight balls (20) are movably mounted on the bottom of the cross plate (9); a mounting frame (5) is fixed to the bottom of the cross plate (9); the laser rangefinder (6) is mounted in the mounting frame (5) and is clamped and fixed; when the laser rangefinder (6) is located in the mounting frame (5), it is not affected by the mounting seat (1); the laser rangefinder (6) is adaptively adjusted and in a horizontal state in cooperation with the cross plate (9) and the counterweight balls (20).

2. A position measuring device for civil engineering construction according to claim 1, characterized in that: The mounting seat (1) is provided with a damping shaft (2), and the bracket (3) is mounted on the upper end of the damping shaft (2).

3. A position measuring device for civil construction according to claim 1, characterized in that: A first round rod (16) is fixed to the inner top of the bracket (3); a first connecting ball (18) is fixedly connected to the bottom of the first round rod (16); a ball sleeve (34) movably connected to the first connecting ball (18) is sleeved on the outside of the first connecting ball (18); the ball sleeve (34) passes through the cross plate (9) and is fixedly connected to the cross plate; a coaxially arranged first soot blowing channel (17) is penetrated through the first round rod (16) and the first connecting ball (18).

4. A position measuring device for civil construction according to claim 3, characterized in that: A second round rod (19) is fixed to the bottom of the cross plate (9), a second connecting ball (26) is fixed to the bottom of the second round rod (19), a ball groove (35) is provided at the upper end of the counterweight ball (20), the second connecting ball (26) is movably connected in the ball groove (35), and a coaxially arranged second soot blowing channel (27) is penetrated through the second round rod (19) and the second connecting ball (26).

5. A position measuring device for civil construction according to claim 4, characterized in that: The inner top of the mounting frame (5) is fixedly connected to a first piston cylinder (11), a first air intake pipe (24) is mounted on the first piston cylinder (11), a first non-return valve (25) is mounted on the first air intake pipe (24), a first movable piston (29) is slidably connected inside the first piston cylinder (11), a first spring (33) is fixedly connected to the first movable piston (29), the other end of the first spring (33) is connected to the first piston cylinder (11), a movable rod (28) is fixedly connected to the bottom of the first movable piston (29), a clamping plate (36) is fixed to the bottom of the movable rod (28), a rubber pad (8) is fixed to the bottom of the clamping plate (36) and the inner bottom of the mounting frame (5), and the laser rangefinder (6) is located between the two rubber pads (8) and abuts against each other.

6. A position measuring device for civil construction according to claim 5, characterized in that: The air supply mechanism further comprises an air supply mechanism capable of supplying air to the first sootblowing channel (17) and the second sootblowing channel (27), the air supply mechanism comprising an air bag (30) fixed to the top of the first piston cylinder (11), the air bag (30) being fixedly connected to the first movable piston (29), a second air inlet pipe (31) being mounted on the air bag (30), a second one-way valve (32) being mounted on the second air inlet pipe (31), an air supply pipe (23) being fixedly arranged on the air bag (30) and penetrating the first piston cylinder (11), the air supply pipe (23) penetrating the first round rod (16) and being connected to the first sootblowing channel (17), a delivery pipe (22) being fixedly mounted on the first round rod (16) and being connected to the first sootblowing channel (17), the delivery pipe (22) being connected to the second sootblowing channel (27).

7. A position measuring device for civil construction according to claim 5, characterized in that: It also includes a retractable sun visor (4), wherein the bracket (3) is provided with a storage groove (10), the sun visor (4) is slidably connected in the storage groove (10), and two second piston cylinders (12) fixedly connected thereto are embedded in the sun visor (4), a second movable piston (15) is slidably connected in the second piston cylinder (12), a second spring (13) is fixed on the second movable piston (15), the other end of the second spring (13) is fixedly connected to the second piston cylinder (12), a pull rod (14) is fixed on the second movable piston (15), and the pull rod (14) is fixedly connected to the inner wall of the storage groove (10), and the two second piston cylinders (12) are connected to the first piston cylinder (11) via a Y-type hose (21).

8. A position measuring device for civil construction according to claim 1, characterized in that: A baffle (7) is fixed to the inner wall of the installation frame (5); when the laser rangefinder (6) is installed in the installation frame (5), the laser rangefinder (6) abuts against the baffle (7).

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