A displacement monitoring device for long-span building steel structure

Abstract

The application relates to a large-span building steel structure displacement monitoring device, belonging to the technical field of steel structure displacement monitoring, which comprises a receiving end for being installed at the bottom of a steel structure, the receiving end comprising a detection trolley and a reflector arranged at the bottom of the detection trolley; further comprising a monitoring table arranged on the ground, a first laser emitter being rotatably arranged on the monitoring table, a first arc protractor being arranged on the monitoring table, the first arc protractor being located on the side of the first laser emitter and being parallel to the first laser emitter; the light emitted by the first laser emitter is directly incident on the contact point between the middle extension line of the second arc protractor and the reflector, the distance between the light of the second laser emitter and the first laser emitter is measured, the included angle between the light of the first laser emitter and the monitoring table is measured, and the distance between the reflector and the ground is converted; the displacement change amount of the corresponding steel structure installation position of the detection trolley is measured by comparing the distance change of the reflector and the ground. The application has the effect of reducing the displacement monitoring investment cost.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel structure displacement monitoring, in particular to a large-span building steel structure displacement monitoring device. BACKGROUND

[0002] Steel structure is a structure composed of steel materials and is one of main building structure types. The structure is mainly composed of members such as steel beams, steel columns and steel trusses made of profiled steel and steel plates, and adopts rust removal and rust prevention processes such as silanization, pure manganese phosphating, water washing and drying and galvanizing. Welding, bolts or rivets are usually used to connect between various members or parts. Because the self weight is lighter and the construction is simple, the steel structure is widely used in fields such as large workshops, venues, super high-rise buildings and bridges. The large-span building steel structure defines a structure with a span of more than 60 m as a large-span structure.

[0003] However, the building steel structure is affected by material and structure factors, load and stress state, temperature and expansion and shrinkage, installation and foundation problems and dynamic and short-term effects, which leads to displacement. In order to ensure the use safety of the steel structure, it is necessary to monitor the displacement of the steel structure.

[0004] However, when monitoring the displacement of the steel structure, a displacement sensor is usually used, and the displacement sensor is fixed on the test node of the steel structure. Because there are many test nodes of the steel structure, many displacement sensors need to be installed, which leads to high investment cost of displacement monitoring. SUMMARY

[0005] In order to reduce the investment cost of displacement monitoring, a large-span building steel structure displacement monitoring device comprises a receiving end for installation at the bottom of a steel structure, the receiving end comprises a detection trolley and a mirror arranged at the bottom of the detection trolley, and the detection trolley is arranged to move at the bottom of the steel structure.

[0006] Further comprising a monitoring table arranged on the ground, a first laser emitter is rotatably arranged on the monitoring table, the rotation axis of the first laser emitter is parallel to the monitoring table and perpendicular to the moving direction of the detection trolley, a first arc protractor is arranged on the monitoring table, the first arc protractor is located on one side of the first laser emitter and parallel to the first laser emitter.

[0007] A second arc protractor is arranged at the bottom of the mirror, the second arc protractor is perpendicular to the mirror, a second laser emitter is arranged at the middle part of the second arc protractor, and the second laser emitter is perpendicular to the mirror and directly shoots the ground.

[0008] The light emitted by the first laser emitter is directly incident on the contact point between the middle extension line of the second arc protractor and the mirror, the distance between the light of the second laser emitter and the light of the first laser emitter is measured, and the distance between the mirror and the ground is converted by measuring the angle between the light of the first laser emitter and the monitoring table, so as to measure the displacement change of the detection trolley corresponding to the installation position of the steel structure.

[0009] Further, the top of the detection trolley is provided with a fixed wheel, the side of the detection trolley is provided with a walking wheel, the fixed wheel is rotatably arranged on the top of the detection trolley and is magnetically attracted to the bottom of the steel structure, the length direction and the rotation axis of the walking wheel are both in the vertical direction, a connecting arm is arranged between the walking wheel and the detection trolley, the connecting arm is a telescopic structure to drive the walking wheel to clamp the side wall of the steel structure, and a walking motor is arranged on the connecting arm to drive the walking wheel to rotate and drive the detection trolley to move.

[0010] Further, a water injection cavity is formed in the detection trolley, a floating plate is arranged in the water injection cavity, the floating plate floats on the liquid surface, and a connecting rod is arranged to connect the floating plate and the mirror so that the mirror is in a horizontal state.

[0011] Further, a long strip-shaped notch is formed in the side of the detection trolley, the connecting rod is connected to the top or side of the floating plate, the connecting rod extends downward after being bent through the long strip-shaped notch and moves out of the water injection cavity to connect the side of the mirror.

[0012] Further, an installation frame is arranged in the water injection cavity, the middle part of the floating plate is hingedly connected to the installation frame, the rotation axis of the floating plate is perpendicular to the moving direction of the detection trolley, and the vertical middle part of the floating plate floats in the water.

[0013] Further, a supporting plate is arranged on the monitoring table, the supporting plate comprises a plurality of plates hingedly connected to each other, one of the plates at the end is hingedly connected to the side of the monitoring table, the hinging axis of the plate is perpendicular to the ground, the length of the plate gradually increases to surround the monitoring table, the light emitted by the second laser emitter is directly incident on the plate, a positioning plate is detachably arranged on the plate, the top of the positioning plate and the side facing the monitoring table are both provided with an entering hole, the light emitted by the second laser emitter is directly incident on the entering hole, and a laser length measuring instrument is horizontally arranged on the monitoring table, and the light emitted by the laser length measuring instrument is directly incident on the entering hole.

[0014] Further, the two entering holes in the positioning plate are perpendicular to each other and communicate with each other to form an L shape.

[0015] Further, the monitoring platform is provided with a support frame, the first laser emitter is hingedly arranged on the support frame, a worm wheel is coaxially arranged on the hinge shaft of the first laser emitter, a worm is rotatably arranged on the support frame and engaged with the worm wheel, and the hinge shaft of the first laser emitter and the laser length measuring instrument are located on the same horizontal plane.

[0016] Further, the water injection cavity is provided with a partition plate, the partition plate is horizontally arranged and parallel to the bottom wall of the water injection cavity, the partition plate is located above the floating plate and the distance between them is greater than N times the thickness of the floating plate, the partition plate is provided with a micro water pump, and the two ports of the micro water pump are located above and below the partition plate respectively.

[0017] Further, the two interfaces of the micro water pump are provided with water supply pipes, the water supply pipe located below the partition plate is fixedly arranged on the inner wall of the water injection cavity and close to the bottom wall of the water injection cavity, a plurality of water outlets are formed in the water supply pipe and face the inner wall of the water injection cavity, and the included angle between the axis direction of the water outlet and the inner wall of the water injection cavity is an acute angle.

[0018] The technical scheme of the present application has at least the following advantages and beneficial effects:

[0019] 1. When monitoring the displacement of a large-span steel structure, first, the detection trolley is installed at the bottom of the steel structure, then the monitoring platform is installed on the ground and placed at the bottom of the steel structure to be measured, then the detection trolley is moved to the position to be monitored, then the first laser emitter is turned on and rotated, the light emitted by the first laser emitter is irradiated onto the reflector, the first laser emitter is irradiated to the middle of the second arc protractor, then the second laser emitter is turned on, the light emitted by the second laser emitter is directly irradiated to the ground, then the distance between the light of the second laser emitter and the first laser emitter is measured, and the distance between the light of the first laser emitter and the monitoring platform is measured to convert the distance between the reflector and the ground, the above distances are repeatedly tested and compared, and the displacement value of the steel structure is obtained; when the test position needs to be changed, the position of the detection trolley on the steel structure is adjusted, and the distance measurement is performed again, so that multi-point measurement is performed, thereby reducing the investment cost of steel structure displacement monitoring;

[0020] 2. When the steel structure is bent due to load or dynamic load, the test point is easy to bend, and the curvature is difficult to measure, when the detection trolley moves to the test point, the reflector is easy to tilt, thereby causing a large error in the measured distance, at this time, under the action of the floating plate, the floating plate automatically adjusts to a horizontal state, thereby making the reflector in a horizontal state, thereby improving the accuracy of the test data; further, when the detection position of the detection trolley is tested, the horizontal state of the reflector is automatically adjusted to facilitate monitoring the displacement of the steel structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 is a monitoring principle diagram of a large-span building steel structure displacement monitoring device according to an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the overall structure of a large-span building steel structure displacement monitoring device according to an embodiment of the present application;

[0024] Figure 3 is a schematic diagram of the structure of a second laser emitter in a large-span building steel structure displacement monitoring device according to an embodiment of the present application;

[0025] Figure 4 is Figure 3 is an enlarged schematic diagram of part A in

[0026] Figure 5 is a sectional view of a detection trolley in a large-span building steel structure displacement monitoring device according to an embodiment of the present application;

[0027] Figure 6 is Figure 5 is an enlarged schematic diagram of part B in

[0028] Explanation of reference signs: 1, steel structure; 2, receiving end; 21, detection trolley; 22, reflecting mirror;

[0029] 3, monitoring table; 4, first laser emitter; 5, first arc protractor; 6, second arc protractor; 7, second laser emitter; 8, fixed wheel; 9, walking wheel; 10, connecting arm; 11, walking motor; 12, water injection cavity; 13, floating plate; 14, connecting rod; 15, long strip-shaped notch; 16, mounting bracket; 17, partition plate; 18, micro water pump; 19, water delivery pipe;

[0030] 20, support plate; 201, plate body;

[0031] 23, positioning plate; 24, entry hole; 25, laser length measuring instrument; 26, support bracket. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0034] The following will be further described in conjunction with specific embodiments, with reference to Figure 1 and Figure 2 The large-span building steel structure displacement monitoring device comprises a receiving end 2 arranged at the bottom of the steel structure 1, the receiving end 2 comprising a detection trolley 21 and a reflecting mirror 22 arranged at the bottom of the detection trolley 21, the detection trolley 21 moving on the bottom of the steel structure 1;

[0035] With reference to Figure 1 and Figure 2 The large-span building steel structure displacement monitoring device further comprises a monitoring table 3 arranged on the ground, the monitoring table 3 being provided with a first laser emitter 4 rotating thereon, the light emitted by the first laser emitter 4 being colored light, and the rotating axis of the first laser emitter 4 being parallel to the monitoring table 3 and perpendicular to the moving direction of the detection trolley 21, the monitoring table 3 being provided with a first arc protractor 5, the first arc protractor 5 being located on the side of the first laser emitter 4 and parallel to the first laser emitter 4;

[0036] With reference to Figure 3 and Figure 4 The bottom of the reflecting mirror 22 is provided with a second arc protractor 6, the second arc protractor 6 being perpendicular to the reflecting mirror 22, and the middle part of the second arc protractor 6 is provided with a second laser emitter 7, the second laser emitter 7 being perpendicular to the reflecting mirror 22 and directly shooting the ground;

[0037] With reference to Figure 1 The light emitted by the first laser emitter 4 directly shoots the contact point between the middle part of the second arc protractor 6 and the reflecting mirror 22, the distance between the light of the second laser emitter 7 and the first laser emitter 4 is measured, and the included angle between the light of the first laser emitter 4 and the monitoring table 3 is measured to convert the distance between the reflecting mirror 22 and the ground, and the displacement change of the installation position of the detection trolley 21 corresponding to the steel structure 1 is measured by comparing the distance change between the reflecting mirror 22 and the ground.

[0038] When the displacement of the large-span steel structure 1 is monitored, first, the detection trolley 21 is installed at the bottom of the steel structure 1, then the monitoring platform 3 is installed on the ground and placed at the bottom of the steel structure 1 to be monitored, then the detection trolley 21 is moved to the position to be monitored, then the first laser emitter 4 is turned on, the light emitted by the first laser emitter 4 is irradiated onto the mirror 22, and the first laser emitter 4 is irradiated to the middle of the second arc protractor 6, then the second laser emitter 7 is turned on, the light emitted by the second laser emitter 7 is directly irradiated to the ground, then the distance between the light of the second laser emitter 7 and the first laser emitter 4 is measured, and the distance between the light of the first laser emitter 4 and the monitoring platform 3 is measured to convert the distance between the mirror 22 and the ground, the above distance is repeatedly measured, and the distance difference is compared, so as to obtain the displacement value of the steel structure 1; when the test position needs to be changed, the position of the detection trolley 21 on the steel structure 1 is adjusted, and the distance measurement is performed again, so that multi-point measurement is performed, and the investment cost of the displacement monitoring of the steel structure 1 is reduced.

[0039] Meanwhile, the reading on the second arc protractor 6 is read, and the distance between the light of the second laser emitter 7 and the first laser emitter 4 is measured, the above data is used to convert the distance between the mirror 22 and the ground, and the average value is obtained through two groups of data, so as to improve the accuracy of the displacement measurement.

[0040] With reference to Figure 2 and Figure 3 In the embodiment of the present application, the top of the detection trolley 21 is provided with a fixed wheel 8, and the side of the detection trolley 21 is provided with a walking wheel 9, the fixed wheel 8 is rotatably arranged on the top of the detection trolley 21 and is magnetically attracted to the bottom of the steel structure 1, the length direction and the rotation axis of the walking wheel 9 are both along the vertical direction, a connecting arm 10 is arranged between the walking wheel 9 and the detection trolley 21, the connecting arm 10 is a telescopic structure and drives the walking wheel 9 to clamp the side wall of the steel structure 1, and a walking motor 11 is arranged on the connecting arm 10 and is used to drive the walking wheel 9 to rotate and drive the detection trolley 21 to move. When the position of the detection trolley 21 is adjusted, the walking motor 11 is started, the walking motor 11 drives the walking wheel 9 to rotate, the walking wheel 9 rotates and drives the detection trolley 21 to run on the bottom of the steel structure 1, and the operation is simple and convenient; in the embodiment of the present application, the fixed wheel 8 is made of a cylindrical magnet and is attracted to the bottom of the steel structure 1, so that the detection trolley 21 can be conveniently fixed on the bottom of the steel structure 1.

[0041] With reference to Figure 2 and Figure 3 Further, since the walking wheel 9 is clamped on the side wall of the steel structure 1, on the one hand, it is convenient to drive the detection trolley 21 to move on the steel structure 1, and on the other hand, it is convenient to guide the moving direction of the detection trolley 21, so that the detection trolley 21 can move linearly on the bottom of the steel structure 1.

[0042] With reference toFigure 2 And Figure 3 In the embodiment of the present application, the connecting arm 10 is provided with a micro push rod, the length direction of the output shaft of the micro push rod is parallel to the length direction of the connecting arm 10, and the telescopic end of the connecting arm 10 is fixedly arranged on the output shaft of the micro push rod; further, the two micro push rods are controlled by the same controller, so that the two connecting arms 10 are simultaneously recovered to adjust the detection trolley 21 to be located at the middle of the bottom of the steel structure 1.

[0043] When the detection trolley 21 runs to the displacement of the steel structure 1, the detection trolley 21 is in a non-horizontal state, which causes the mirror 22 to be in a non-horizontal state, resulting in a large error in distance measurement. Therefore, in the embodiment of the present application, a water injection cavity 12 is formed in the detection trolley 21, liquid is injected into the water injection cavity 12, a floating plate 13 is arranged in the water injection cavity 12, the floating plate 13 floats on the liquid surface, and a connecting rod 14 is arranged, which is used to connect the floating plate 13 and the mirror 22 so that the mirror 22 is in a horizontal state; when the detection trolley 21 moves to the bending position of the steel structure 1, the detection trolley 21 is in an inclined state, and the liquid surface in the water injection cavity 12 is in a horizontal state, so that the floating plate 13 is in a horizontal state. At this time, under the action of the connecting rod 14, the mirror 22 is in a horizontal state, thereby facilitating distance measurement.

[0044] Referring to Figure 3 , Figure 5 And Figure 6 In the embodiment of the present application, a long strip-shaped notch 15 is formed in the side surface of the detection trolley 21, the connecting rod 14 is connected to the top or side of the floating plate 13, and the connecting rod 14 is bent and then moves out of the water injection cavity 12 through the long strip-shaped notch 15 and then extends downward to connect the side edge of the mirror 22.

[0045] Referring to Figure 3 , Figure 5 And Figure 6 When the detection trolley 21 runs on the bottom of the steel structure 1, the liquid in the water injection cavity 12 shakes greatly, which causes the floating plate 13 to shake greatly on the liquid surface, and causes the mirror 22 to deviate greatly. Therefore, the mirror 22 needs to be stationary before distance measurement can be performed, and therefore, in the embodiment of the present application, a mounting bracket 16 is arranged in the water injection cavity 12, the middle part of the floating plate 13 is hingedly connected to the mounting bracket 16, the rotation axis of the floating plate 13 is perpendicular to the running direction of the detection trolley 21, and the vertical middle part of the floating plate 13 floats in the water; under the action of the mounting bracket 16, the position of the floating plate 13 is limited, thereby avoiding left and right movement in the water injection cavity 12, thereby facilitating the floating plate 13 to quickly stop in the liquid, and further facilitating the mirror 22 to quickly stop.

[0046] Referring to Figure 3 , Figure 5 AndFigure 6 In order to further improve the static efficiency of the mirror 22, in the embodiment of the present application, a partition plate 17 is arranged in the water injection cavity 12. The peripheral wall of the partition plate 17 is fixedly arranged on the side wall of the water injection cavity 12. The partition plate 17 is horizontally arranged and parallel to the bottom wall of the water injection cavity 12. The partition plate 17 is located above the floating plate 13 and the distance between them is greater than N times the thickness of the floating plate 13. In the embodiment of the present application, the distance between the partition plate 17 and the floating plate 13 is 2 times the thickness of the floating plate 13.

[0047] With reference to Figure 3 , Figure 5 and Figure 6 , a micro water pump 18 is arranged on the partition plate 17. The two ports of the micro water pump 18 are located above and below the partition plate 17 respectively. When the detection trolley 21 moves, the micro water pump 18 is started. The micro water pump 18 extracts the liquid below and delivers it to the upper side of the partition plate 17, so that the floating plate 13 is separated from the liquid, thereby avoiding the possibility of large amplitude shaking of the mirror 22 when the detection trolley 21 runs. When the detection trolley 21 runs to the detection point, the micro water pump 18 is started. The micro water pump 18 extracts the liquid above and injects it into the water injection cavity 12 below. The liquid surface gradually rises and acts on the floating plate 13, and the floating plate 13 gradually floats on the liquid surface, thereby ensuring that the floating plate 13 rotates slightly, and further ensuring the position of the mirror 22.

[0048] With reference to Figure 3 , Figure 5 and Figure 6 , in the embodiment of the present application, the two interfaces of the micro water pump 18 are provided with water delivery pipes 19. The water delivery pipe 19 located below the partition plate 17 is fixedly arranged on the inner wall of the water injection cavity 12 and close to the bottom wall of the water injection cavity 12. A plurality of water outlet holes are formed on the water delivery pipe 19 and face the inner wall of the water injection cavity 12. The angle between the axis direction of the water outlet hole and the inner wall of the water injection cavity 12 is an acute angle. The micro water pump 18 extracts the liquid into the water injection cavity 12 below. The liquid flows to the inner wall of the water injection cavity 12 through the water delivery pipe 19 and then flows from the inner wall of the water injection cavity 12, thereby reducing the shaking degree of the liquid surface. Further, the water delivery pipe 19 is fixedly arranged on the inner wall of the water injection cavity 12 and close to the bottom wall of the water injection cavity 12, which facilitates the injection of liquid from below the liquid surface, and further reduces the shaking degree of the liquid surface.

[0049] With reference to Figure 1 and Figure 2In the embodiment of the present application, the support plate 20 is arranged on the monitoring platform 3, the support plate 20 comprises a plurality of plate bodies 201 which are hinged to each other, one plate body 201 at the end is hinged to the side of the monitoring platform 3, the hinging axis of the plate body 201 is perpendicular to the ground, the length of the plate body 201 gradually increases and surrounds the monitoring platform 3, the light emitted by the second laser emitter 7 directly irradiates the plate body 201, the positioning plate 23 is detachably arranged on the plate body 201, the top of the positioning plate 23 and the surface of the positioning plate 23 which faces the monitoring platform 3 are both provided with an entering hole 24, the light emitted by the second laser emitter 7 directly irradiates the entering hole 24, the laser length measuring instrument 25 is horizontally arranged on the monitoring platform 3, the light emitted by the laser length measuring instrument 25 directly irradiates the entering hole 24; when the light emitted by the second laser emitter 7 directly irradiates the ground, the plate body 201 is gradually turned out by pulling, so that the plate body 201 is arranged flat on the side wall of the monitoring platform 3, thereby facilitating the second laser emitter 7 to directly irradiate the support plate 20, then the positioning plate 23 is placed on the support plate 20, so that the light emitted by the second laser emitter 7 directly irradiates the entering hole 24, the light emitted by the laser length measuring instrument 25 directly irradiates the entering hole 24, the distance between the first laser emitter 4 and the positioning plate 23 is the required length, thereby facilitating the distance conversion between the reflecting mirror 22 and the support plate 20.

[0050] With reference to Figure 3 In the embodiment of the present application, the two entering holes 24 in the positioning plate 23 are perpendicular to each other and communicate with each other to form an L shape.

[0051] With reference to Figure 1 and Figure 2 In the embodiment of the present application, the support frame 26 is arranged on the monitoring platform 3, the first laser emitter 4 is hingedly arranged on the support frame 26, the worm wheel is coaxially arranged on the hinge shaft of the first laser emitter 4, the worm is rotatably arranged on the support frame 26 and engages with the worm wheel, and the hinge shaft of the first laser emitter 4 and the laser length measuring instrument 25 are located on the same horizontal plane; when the angle of the first laser emitter 4 is adjusted, the worm is rotated, the rotation of the worm drives the rotation of the worm wheel, the rotation of the worm wheel drives the rotation of the first laser emitter 4, and the first laser emitter 4 is fixed at the position after rotation, thereby facilitating the emitted light to directly irradiate the reflecting mirror 22.

[0052] The implementation principle of the displacement monitoring device for long-span building steel structure in the embodiment of the present application is as follows:

[0053] When the displacement of the large-span steel structure 1 is monitored, the detection trolley 21 is first installed at the bottom of the steel structure 1, then the monitoring platform 3 is installed on the ground and placed at the bottom of the steel structure 1 to be monitored, then the detection trolley 21 is moved to the position to be monitored, then the first laser emitter 4 is turned on and rotated, the light emitted by the first laser emitter 4 is irradiated onto the mirror 22, and the first laser emitter 4 is irradiated to the middle of the second arc protractor 6, then the second laser emitter 7 is turned on, the light emitted by the second laser emitter 7 is directly irradiated to the ground, then the distance between the light of the second laser emitter 7 and the first laser emitter 4 is measured, and the distance between the light of the first laser emitter 4 and the monitoring platform 3 is measured to convert the distance between the mirror 22 and the ground, the above distance is repeatedly tested, and the distance difference is compared, so as to obtain the displacement value of the steel structure 1; when the test position needs to be changed, the position of the detection trolley 21 on the steel structure 1 is adjusted, and the distance measurement is performed again, so that multi-point measurement is performed, thereby reducing the investment cost of the displacement monitoring of the steel structure 1.

[0054] When the detection trolley 21 moves, the micro water pump 18 is started, the micro water pump 18 draws the liquid below and delivers it to the upper side of the partition plate 17, so that the floating plate 13 is separated from the liquid, thereby avoiding the possibility that the mirror 22 shakes greatly when the detection trolley 21 runs; when the detection trolley 21 runs to the detection point, the micro water pump 18 is started, the micro water pump 18 draws the liquid above and injects it into the water injection cavity 12 below, the liquid level of the liquid gradually rises and acts on the floating plate 13, and the floating plate 13 gradually floats on the liquid surface, thereby ensuring that the floating plate 13 rotates slightly, and thereby ensuring the position of the mirror 22, thereby facilitating the distance measurement between the mirror 22 and the support plate 20.

[0055] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A large-span building steel structure displacement monitoring device, characterized in that: The utility model provides a kind of laser monitoring device for steel structure, including the receiving end (2) for installing at the bottom of steel structure (1), the receiving end (2) includes detection trolley (21) and mirror (22) being arranged at the bottom of detection trolley (21), detection trolley (21) moves and is arranged at the bottom of steel structure (1); It also includes monitoring platform (3) arranged on the ground, first laser emitter (4) is rotatably arranged on monitoring platform (3), the rotation axis of first laser emitter (4) is parallel to monitoring platform (3) and perpendicular to the direction of detection trolley (21), first arc protractor (5) is arranged on monitoring platform (3), first arc protractor (5) is located on the side of first laser emitter (4) and parallel to first laser emitter (4); The bottom of mirror (22) is provided with second arc protractor (6), and second arc protractor (6) is perpendicular to mirror (22), second laser emitter (7) is arranged in the middle of second arc protractor (6), and second laser emitter (7) is perpendicular to mirror (22) and directly shoots the ground; The light emitted by first laser emitter (4) directly shoots the contact point of the extension line of the middle of second arc protractor (6) and mirror (22), the distance between the light of second laser emitter (7) and first laser emitter (4) is measured, and the included angle between the light of first laser emitter (4) and monitoring platform (3) is measured to convert the distance between mirror (22) and the ground, and the displacement change of detection trolley (21) corresponding to the installation position of steel structure (1) is measured by comparing the distance change of mirror (22) and the ground; Supporting plate (20) is arranged on monitoring platform (3), supporting plate (20) includes a plurality of hingedly connected plate bodies (201), one of the plate bodies (201) at the end is hingedly connected to the side of monitoring platform (3), the hinged axis of plate body (201) is perpendicular to the ground, the length of plate body (201) gradually increases to surround monitoring platform (3), the light emitted by second laser emitter (7) directly shoots plate body (201), positioning plate (23) is detachably arranged on plate body (201), entering hole (24) is formed in the top of positioning plate (23) and the side facing monitoring platform (3), the light emitted by second laser emitter (7) directly shoots entering hole (24), laser length measuring instrument (25) is horizontally arranged on monitoring platform (3), and the light emitted by laser length measuring instrument (25) directly shoots entering hole (24); The two entering holes (24) in positioning plate (23) are perpendicular to each other and communicate with each other to form L shape.

2. The displacement monitoring device for long-span building steel structure according to claim 1, characterized in that: The top of the detection trolley (21) is provided with a fixed wheel (8), the side of the detection trolley (21) is provided with a walking wheel (9), the fixed wheel (8) is rotatably arranged on the top of the detection trolley (21) and is magnetically attracted to the bottom of the steel structure (1), the length direction and the rotation axis of the walking wheel (9) are both along the vertical direction, a connecting arm (10) is arranged between the walking wheel (9) and the detection trolley (21), the connecting arm (10) is a telescopic structure and drives the walking wheel (9) to be clamped on the side wall of the steel structure (1), and a walking motor (11) is arranged on the connecting arm (10) and is used to drive the walking wheel (9) to rotate and drive the detection trolley (21) to move.

3. The displacement monitoring device for long-span building steel structure according to claim 2, characterized in that: The inside of the detection trolley (21) is provided with a water injection cavity (12), the water injection cavity (12) is provided with a floating plate (13), the floating plate (13) floats on the liquid surface, further comprising a connecting rod (14), the connecting rod (14) is used to connect the floating plate (13) and the reflecting mirror (22) so that the reflecting mirror (22) is in a horizontal state.

4. The displacement monitoring device for long-span building steel structure according to claim 3, characterized in that: The side of the detection trolley (21) is provided with a long strip-shaped notch (15), the connecting rod (14) is connected with the top or side of the floating plate (13), the connecting rod (14) is bent and then passes through the long strip-shaped notch (15), moves out of the water injection cavity (12) and extends downward to connect the side edge of the reflecting mirror (22).

5. The displacement monitoring device for long-span building steel structure according to claim 3, characterized in that: The water injection cavity (12) is provided with a mounting bracket (16), the middle part of the floating plate (13) is hingedly connected to the mounting bracket (16), the rotation axis of the floating plate (13) is perpendicular to the moving direction of the detection trolley (21), and the vertical middle part of the floating plate (13) floats in water.

6. The displacement monitoring device for long-span building steel structure according to claim 1, characterized in that: The monitoring platform (3) is provided with a support frame (26), the first laser emitter (4) is hingedly arranged on the support frame (26), a worm wheel is coaxially arranged on the hinge shaft of the first laser emitter (4), a worm is rotatably arranged on the support frame (26) and is engaged with the worm wheel, and the hinge shaft of the first laser emitter (4) and the hinge shaft of the laser length measuring instrument (25) are located on the same horizontal plane.

7. The displacement monitoring device for long-span building steel structure according to claim 3, characterized in that: The water injection cavity (12) is provided with a partition plate (17), the partition plate (17) is horizontally arranged and parallel to the bottom wall of the water injection cavity (12), the partition plate (17) is located above the floating plate (13) and the distance therebetween is greater than N times the thickness of the floating plate (13), the partition plate (17) is provided with a micro water pump (18), and the two ports of the micro water pump (18) are located above and below the partition plate (17) respectively.

8. The displacement monitoring device for long-span building steel structure according to claim 7, characterized in that: Both interfaces of the micro water pump (18) are provided with water pipes (19), the water pipe (19) located below the partition plate (17) is fixedly arranged on the inner wall of the water injection cavity (12) and close to the bottom wall of the water injection cavity (12), a plurality of water outlets are formed in the water pipe (19) and face the inner wall of the water injection cavity (12), and the axis direction of the water outlet and the inner wall of the water injection cavity (12) form an acute angle.

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