Underwater topographic surveying and mapping device for engineering surveying

Abstract

The invention relates to the technical field of measuring equipment, and provides an engineering surveying underwater topographic surveying and mapping device which comprises a floating unit, a base plate, a multi-section telescopic unit and a sounding rope. The floating unit floats on the water surface of a section to be surveyed and mapped; the base plate is arranged on the floating unit; the multiple sections of telescopic units are horizontally arranged on the base plate in a sliding mode and are provided with telescopic heads extending downwards; the first end of the depth measuring rope is connected to the telescopic head, the second end of the depth measuring rope is wound and connected to the base plate, and the depth measuring rope is used for measuring the water depth. According to the technical scheme, the problem that the surveying and mapping cost is too high when advanced equipment is used for surveying and mapping underwater terrains such as small rivers and reservoirs in the prior art is solved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of measuring equipment, and in particular, to an engineering survey underwater topographic mapping device. BACKGROUND

[0002] China is vast in territory and diverse in topography, with streams, lakes and reservoirs distributed like stars in a constellation. Therefore, underwater topographic survey technicians need to map the riverbed topography to learn the current underwater topography and facilitate the smooth progress of later water conservancy management. However, with the reciprocating storage and release of reservoirs, the underwater topography of the reservoirs will change to some extent. In particular, streams, accompanied by continuous erosion of water flow and the occurrence of dry and wet seasons, will cause changes in the riverbed. Therefore, it is necessary to regularly map the underwater topography of these streams, reservoirs and other areas to facilitate the overall water conservancy management.

[0003] In the prior art, underwater topographic mapping can be performed by installing an echo sounder and a side-scan sonar on a ship to simultaneously measure the water depth and the size and position of underwater objects. It can also be performed by using a multi-beam echo sounder system, underwater photogrammetry, airborne laser depth sounding and ocean remote sensing depth sounding. The above measurement methods are mostly used for mapping the seabed topography of the sea, and the equipment used is highly precise and expensive. For small streams, reservoirs and other areas, if the above equipment is used for measurement, the phenomenon of "using a sledgehammer to crack a nut" will occur, and the mapping cost of the above special areas will be increased to a large extent. Therefore, it is necessary to optimize the existing technology and provide a mapping device suitable for the above areas to complete the mapping work at a relatively low cost. SUMMARY

[0004] To overcome the above defects, embodiments of the present application provide an engineering survey underwater topographic mapping device, which solves the problem of high mapping cost caused by using advanced equipment to map the underwater topography of some small streams, reservoirs and other areas in the related art.

[0005] According to one aspect, at least one embodiment of the present application provides an engineering survey underwater topographic mapping device, comprising: a floating unit floating on the water surface of a to-be-mapped section; a base plate provided on the floating unit; a multi-section telescopic unit horizontally slidingly provided on the base plate and having a telescopic head extending downward; a depth sounding line having a first end connected to the telescopic head and a second end wound and connected to the base plate, the depth sounding line being used to measure the water depth.

[0006] For example, the engineering survey underwater topographic mapping device provided by at least one embodiment of the present application further comprises: A rope shaft disc is rotatably arranged on the base plate, and the second end of the sounding rope is wound and connected to the rope shaft disc. A rotation driver is arranged on the base plate and is configured to provide power for driving the rope shaft disc to rotate.

[0007] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises a rope tensioning unit, and the rope tensioning unit comprises: A tensioning frame is slidably arranged at the top end of the multi-section telescopic unit; A tensioning shaft is rotatably arranged on the tensioning frame and is configured to support the sounding rope between the rope shaft disc and the telescopic head; A tensioning elastic member has one end acting on the top end of the multi-section telescopic unit and the other end acting on the tensioning frame. Under the elastic pushing action of the tensioning elastic member, the tensioning frame can drive the tensioning shaft to support the sounding rope, so that the sounding rope is in a tensioned state.

[0008] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises a rope tensioning unit, and the rope tensioning unit comprises: A pressure sensor is arranged at one end of the tensioning elastic member. The pressure sensor detects the elastic force of the tensioning elastic member to determine the tensioning state parameter of the sounding rope and transmits the tensioning state parameter to the rotation driver to control the start and stop of the rotation driver.

[0009] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises: A anti-drop roller is rotatably arranged at the top end of the multi-section telescopic unit and is arranged in parallel with the tensioning shaft. The anti-drop roller is configured to press the sounding rope extending upward against the outer wall of the tensioning shaft.

[0010] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises a floating unit, and the floating unit comprises: A floating frame, on which the base plate is arranged; A floating block is arranged on the floating frame and is configured to provide buoyancy for the floating frame.

[0011] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises a floating unit, and the floating unit comprises:

[0012] For example, the underwater topographic surveying device provided by at least one embodiment of the present application further comprises a buffer unit, and the buffer unit comprises: a buffer sliding pipe hinged to the base plate; a buffer sliding rod, one end of which is hinged to the top end of the multi-section telescopic unit, and the other end is connected to the buffer sliding pipe through a buffer elastic element.

[0013] For example, the engineering survey underwater topographic mapping device provided by at least one embodiment of the present application further comprises: two limiting rings arranged in an upper-lower interval and coaxially, and a limiting gap for the buffer sliding pipe to pass through is formed between the two limiting rings.

[0014] For example, the engineering survey underwater topographic mapping device provided by at least one embodiment of the present application further comprises: a rotating wheel rotatably connected to the lower end of the telescopic head through a rotating shaft; a plurality of cutting knives arranged on the rotating wheel and the rotating shaft, respectively, and the two parts of the cutting knives arranged on the rotating wheel and the rotating shaft are cross-shaped to form a mesh.

[0015] The embodiment of the present application has the following beneficial effects: In the present application, during operation, the floating unit is put into the water area to be measured, and then the base plate is installed on the floating unit, and the entire device is floated on the water surface by means of the floating unit. The movement of the water flow can be used to gradually measure the to-be-measured area. The multi-section telescopic unit is started to make the telescopic head extend downward. When the telescopic head extends, the extension rod and one end of the depth measuring rope are simultaneously moved downward. When the telescopic head touches the ground of the riverbed or river channel, the telescopic head is in a pressing state with the underwater ground. At this time, the telescopic head stops moving downward and transmits a bottom touch signal to the multi-section telescopic unit. After receiving the bottom touch signal, the multi-section telescopic unit stops elongating. At this time, the water depth of the measurement point at this place can be obtained through the length of the depth measuring rope inserted below the water surface. The measurement principle is simple and effective, and the operation process is simple and efficient. Without advanced and high-end equipment and mapping principles, the basic state parameters of the underwater topography can be obtained. The device is suitable for underwater topographic survey of small streams, reservoirs, and reduces the configuration and use cost of the mapping equipment based on the completion of measurement. After measuring the underwater topography of a point, the multi-section telescopic unit is started to contract to improve the height of the telescopic head, and then the movement of the telescopic head is stopped. At the same time, the rotating driver drives the rope shaft disc to rotate and wind the depth measuring rope. Then, an external force is applied to drive the multi-section telescopic unit to slide horizontally, and the next measurement point is moved to repeat the above operation process for measurement.

[0016] The above basic equipment completes the measurement of the underwater topography to provide basic state parameters for subsequent mapping. The underwater topographic mapping device is more suitable for underwater topographic survey in some cities, counties and other regions. The cost of the mapping equipment is reduced based on the completion of the measurement operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description only represent some of the example embodiments of the present application. For those skilled in the art, other drawings can also be obtained according to the contents of the example embodiments of the present application and the drawings without any creative effort.

[0018] Figure 1 Fig. 1 is a structural schematic diagram of the whole mapping device in an embodiment of the present application; Figure 2 Fig. 2 is a partial enlarged view of A in Fig. 1; Figure 1 Figure 3 Fig. 3 is a partial enlarged view of B in Fig. 1; Figure 1 Figure 4 Fig. 4 is a structural schematic diagram of the whole mapping device (without the floating unit) in an embodiment of the present application; Figure 1 Figure 5 Fig. 5 is a partial enlarged view of C in Fig. 4. Figure 4

[0019] Fig. 1, 10 is a floating unit, 11 is a floating frame, 12 is a floating block, 20 is a base plate, 30 is a multi-section telescopic unit, 31 is a telescopic head, 41 is a depth sounding rope, 42 is a rope shaft disc, 43 is a rotary driver, 50 is a rope tensioning unit, 51 is a tensioning frame, 52 is a tensioning shaft, 53 is a tensioning elastic member, 54 is a pressure sensor, 60 is a buffer unit, 61 is a buffer sliding pipe, 62 is a buffer sliding rod, 63 is a buffer elastic member, 71 is an anti-falling roller, 72 is a limiting ring, 721 is a limiting gap, 73 is a rotating wheel, 74 is a rotating shaft, and 75 is a cutting knife. DETAILED DESCRIPTION

[0020] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application.

[0021] In order to make the drawings simple, only the parts related to the disclosure are schematically represented in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, only one of the parts with the same structure or function is schematically represented, or only one of the parts is marked in some drawings. In this text, “one” not only means “only one”, but also means “more than one”, and “several” includes “two” and “more than two”.

[0022] ​​​​In this document, unless otherwise indicated and limited, the terms "mount", "connect", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0024] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] Referring to Figures 1-5 As shown in the figure, it shows an engineering survey underwater topographic mapping device in an embodiment of the present application, which is mainly used for measuring the underwater topography of some small rivers, river channels and reservoirs, etc. to provide basic parameter information for subsequent underwater topographic mapping.

[0027] Referring to Figures 1-2 and Figure 4As shown, the underwater topographic mapping device includes a floating unit 10, a floating unit 10, a multi-section telescopic unit 30 and a depth sounding rope 41, and a rope shaft disc 42 and a rotary drive 43 are arranged on the base plate 20; the floating unit 10 is used to provide the buoyancy of the entire mapping device floating on the water surface; the base plate 20 is detachably mounted on the floating unit 10; the multi-section telescopic unit 30 selects the hydraulic cylinder, electric cylinder or air cylinder which can be telescoped in the prior art, and the telescopic head 31 is a free sliding execution end; the telescopic head 31 is provided with an extension rod, one end of the depth sounding rope 41 is fixed on the extension rod, and the other end of the depth sounding rope 41 is wound on and fixed on the rope shaft disc 42; the rotary drive 43 selects a servo motor driven by electricity in the prior art, and the power output by the rotary drive 43 is used to drive the rope shaft disc 42 to rotate.

[0028] When working, the floating unit 10 is put into the water area to be measured, and then the base plate 20 is mounted on the floating unit 10, and the entire device is floated on the water surface by means of the floating unit 10, and the movement of the water flow can be used to gradually measure the area to be measured. The multi-section telescopic unit 30 is started to extend the telescopic head 31 downward, and the telescopic head 31 will simultaneously drive the extension rod and one end of the depth sounding rope 41 to move downward synchronously when the telescopic head 31 extends, and when the telescopic head 31 touches the ground of the riverbed or river channel, the telescopic head 31 is in abutting pressure with the underwater ground, at which time the telescopic head 31 stops moving downward and transmits a bottom touch signal to the multi-section telescopic unit 30, and the multi-section telescopic unit 30 stops elongating after receiving the bottom touch signal, at which time the length of the depth sounding rope 41 extending below the water surface can be used to obtain the water depth of the measurement point, for example, an electronic counter commonly used in the prior art can be installed on the rope shaft disc 42, the number of revolutions of the rope shaft disc 42 is recorded to form a signal which can be transmitted to an external controller, and the specific water depth is calculated by a calculation formula input in advance by the external controller and displayed on an external display. In addition, different color markers can be added to the depth sounding rope 41 to facilitate rough visual confirmation of the water depth, and numerical markers can also be added to the depth sounding rope 41, and the numbers of the markers are enlarged at a certain distance to facilitate visual confirmation. The measurement principle is simple and effective, the operation process is simple and efficient, and the basic state parameters of the underwater topography can be obtained without advanced and high-end equipment and mapping principles, which is suitable for small stream, reservoir underwater topographic survey, and reduces the configuration and use cost of the mapping equipment after completing the measurement. After measuring the underwater topography of a point, the multi-section telescopic unit 30 is started to contract to improve the height of the telescopic head 31, and then the movement of the telescopic head 31 is stopped, and the rotary drive 43 drives the rope shaft disc 42 to rotate and wind up the depth sounding rope 41; then an external force is applied to drive the multi-section telescopic unit 30 to slide horizontally, and the next measurement point is moved, and the above operation process is repeated for measurement.

[0029] In use, the floating unit 10 can be cast into the measurement target area to measure the underwater terrain parameters by means of the fluctuation of water flow, or can be connected to a manned ship by a traction rope in the prior art to measure the underwater terrain by directional movement of the manned ship. The use process is flexible and suitable for various environment mapping. In addition, a GPS-RTK receiver can be installed on the manned ship for real-time positioning, or a 360° prism can be installed on the floating unit 10 to use a shore-based total station to position the coordinates of the water depth point, and the three-dimensional coordinates of the underwater terrain point can be obtained by combining the water depth value, thereby providing a basis for underwater terrain mapping.

[0030] The underwater terrain measurement is completed by the above basic equipment to provide basic state parameters for subsequent mapping. The underwater terrain mapping device is more suitable for underwater terrain survey in some cities and counties; and the cost of the mapping equipment is reduced based on the completion of the measurement operation.

[0031] Referring to Figures 1-4 As shown, the underwater terrain mapping device further comprises a rope tensioning unit 50, and the rope tensioning unit 50 specifically comprises a tensioning frame 51, a tensioning shaft 52, a tensioning elastic member 53, and a pressure sensor 54. The top end of the multi-section telescopic unit 30 is provided with a sliding rod. The tensioning elastic member 53 is selected from the existing spring in the prior art, and is sleeved on the outer periphery of the sliding rod. The upper end of the tensioning elastic member 53 acts on the lower end of the tensioning frame 51, and the lower end of the tensioning elastic member 53 acts on the top end of the multi-section telescopic unit 30. The pressure sensor 54 is selected from the sensor capable of measuring the spring extrusion force in the prior art. The pressure sensor 54 can be installed on the top end of the multi-section telescopic unit 30 and connected to the lower end of the tensioning elastic member 53, or can be installed on the tensioning frame 51 and connected to the upper end of the tensioning elastic member 53.

[0032] In operation, the depth measuring rope 41 is wound from above the tensioning shaft 52, and the depth measuring rope 41 is in a tensioned state, the tensioned depth measuring rope 41 presses downward on the tensioning shaft 52, and the tensioning shaft 52 drives the tensioning frame 51 to slide downward along the sliding rod and press the tensioning elastic member 53; the tensioning elastic member 53 is contracted and accumulates elastic force under the force, until the elastic thrust force provided by the tensioning elastic member 53 and the force applied by the depth measuring rope 41 on the tensioning shaft 52 reach a balance, at which time the tensioning frame 51 no longer slides, and the elastic thrust force accumulated by the tensioning elastic member 53 acts on the pressure sensor 54, the pressure sensor 54 detects the corresponding force and transmits the detection result in the form of an electric signal to the rotary driver 43, the rotary driver 43 determines whether the elastic thrust force of the tensioning elastic member 53 at this time is within the pre-set range according to the received electric signal, if the determination result is that the elastic thrust force accumulated by the tensioning elastic member 53 is within the pre-set range, the rotary driver 43 remains stationary; if the determination result is that the elastic thrust force accumulated by the tensioning elastic member 53 is not within the pre-set range, the drive rotary driver is started at this time, driving the telescopic shaft disc to rotate, releasing or winding the depth measuring rope 41, to avoid the depth measuring rope 41 being too loose or too tight, causing inaccurate measurement, and the depth measuring rope 41 being too tight is prone to cause the depth measuring rope 41 to break.

[0033] Through the buffering of the rope tensioning unit 50 and the timely regulation of the rotary driver 43, the tensioning state of the depth measuring rope 41 can be better adjusted, the measurement accuracy is improved, the detection process is simple and efficient, and through the buffering, damage to parts is avoided, thereby prolonging the service life of the whole surveying device and reducing the cost of equipment replacement and maintenance.

[0034] Referring to Figures 1-2 As shown, the top end of the multi-section telescopic unit 30 is increased with an anti-falling roller 71, the top end of the multi-section telescopic unit 30 is provided with an extension support, the anti-falling roller 71 is rotatably arranged on the extension support, the anti-falling roller 71 is located on the side of the tensioning shaft 52, the depth measuring rope 41 passes from the middle of the anti-falling roller 71 and the tensioning shaft 52, and the depth measuring rope 41 is pressed against the outer periphery of the tensioning shaft 52 by means of the anti-falling roller 71, to prevent the depth measuring rope 41 from separating from the tensioning roller and being misaligned when the multi-section telescopic unit 30 shrinks too fast, causing the subsequent measurement operation of the depth measuring rope 41 to be not smooth.

[0035] Referring to Figure 1As shown, the floating unit 10 structure is refined, and the floating unit 10 specifically includes floating racks 11 and floating blocks 12. The number of floating racks 11 and floating blocks 12 is several. The floating racks 11 are distributed in a circle around the base plate 20. Each floating rack 11 is provided with at least one floating block 12. The floating block 12 is made of a material that can be used for water floating in the prior art, such as a low-density plastic floating block, or a hollow sealed block (non-metal / metal), or a composite material (glass fiber reinforced plastic / carbon fiber composite material, etc.). The buoyancy provided by the floating block 12 supports the entire surveying device to float on the water surface. According to the specific weight of the surveying device, a proper number of floating racks 11 and floating blocks 12 are selected to meet the normal measurement requirements. The connection structure between the floating racks 11 is detachable (for example, a stepped clamping / screwing, etc.). Through disassembly and assembly, the floating unit 10 is convenient to take, place, store and transport.

[0036] Referring to Figures 1-2 and Figures 4-5 As shown, the buffer unit 60 and the two limiting rings 72 are added between the multi-section telescopic unit 30 and the base plate 20. The buffer unit 60 specifically includes a buffer sliding pipe 61, a buffer sliding rod 62 and a buffer elastic member 63. The buffer elastic member 63 is selected from a spring that can be stretched and compressed in the prior art. The number of buffer units 60 is designed to be several, and three is preferred in this example. The three buffer units 60 are distributed in a circle between the base plate 20 and the multi-section telescopic unit 30. When there is no fluctuation, the buffer elastic members 63 in the three buffer units 60 are in a natural stretched or elongated state. The two limiting rings 72 are coaxial and have a height difference, and the limiting gap 721 is formed therebetween. The sliding sleeve pipe passes through the limiting gap 721.

[0037] When the underwater topographic mapping device works, when encountering fluctuating water flow, the multi-section telescopic unit 30 constantly shakes under the impact of the water flow, at this time the top end of the multi-section telescopic unit 30 constantly shakes, the shaking multi-section telescopic unit 30 drives the hinged buffer slide rod 62 to synchronously shake, so that the three buffer units 60 distributed in a circle appear two situations; The first situation is that one buffer unit 60 is forced to contract, and its buffer slide rod 62 axially extrudes the buffer elastic element 63 along the buffer slide pipe 61; The other two buffer units 60 are forced to appear elongation, and their buffer slide rods 62 axially pull the buffer elastic element 63 along the buffer slide pipe 61; The second situation is that two buffer units 60 are forced to contract, and their buffer slide rods 62 axially extrude the buffer elastic element 63 along the buffer slide pipe 61; The other buffer unit 60 is forced to appear elongation, and its buffer slide rod 62 axially pulls the buffer elastic element 63 along the buffer slide pipe 61; No matter which situation appears, when the elastic unit is elongated or shortened, the multi-section telescopic unit 30 simultaneously drives the buffer slide pipe 61 to swing in the limiting gap 721, and the limiting ring 72 supports the buffer unit 60 and the multi-section telescopic unit 30, and can guide and constrain the swinging direction of the buffer slide pipe 61.

[0038] In addition, the positions of the buffer slide rod 62 and the buffer slide pipe 61 can be exchanged, that is, the buffer slide pipe 61 is hingedly connected with the multi-section telescopic unit 30, the buffer slide rod 62 is hingedly connected with the base plate 20, and the buffer elastic element 63 acts on the buffer slide pipe 61 and the buffer slide rod 62 at both ends; On this basis, the base plate 20 is changed from a whole to a half plate hingedly connected together, the limiting ring 72 can be synchronously changed into two half rings, one half ring corresponding to one half plate; Through the half plates hingedly connected with each other, the space occupied by the base plate 20 is reduced, which is convenient for the staff to take, place, install and transport.

[0039] Referring to Figure 1 and Figures 3-4As shown, the lower end of the telescopic head 31 is connected with a rotating wheel 73 through a rotating shaft 74. When measuring the underwater terrain, the whole surveying device can be connected to a floating ship through a traction rope or a rod or a frame, and the position of the surveying device can be adjusted by moving the ship, so as to realize rapid surveying. When the telescopic head 31 is telescoped downward to reach the river bottom / reservoir bottom, the depth of water can be quickly known by means of the length mark of the depth rope 41. At this time, the ship is moved to drive the rotating wheel 73 at the bottom of the telescopic head 31 to roll on the river bottom / reservoir bottom, and the telescopic head 31 floats up and down with the multi-section telescopic unit 30, and the water level measuring instrument is selected from the prior art which can measure the draft of the floating part on the water surface. When the underwater terrain shows an upward trend, the multi-section telescopic unit 30 floats upward, and the whole surveying device is floated upward, at which time the draft is reduced, and the multi-section telescopic unit 30 is started by means of the external controller. The change of the multi-section telescopic unit 30 is fed back to the rotating driver 43 through the rope tensioning unit 50, and the rope shaft disc 42 is adjusted to rotate through the rotating driver 43, so as to realize the winding of the depth rope 41 and obtain new water depth data. Conversely, when the underwater terrain shows a downward trend, the rotating wheel 73 is separated from the river bottom, at which time the telescopic head 31 stops transmitting the bottom touch signal to the multi-section telescopic unit 30, the multi-section telescopic unit 30 is started and starts to lengthen through the external controller, until the rotating wheel 73 on the telescopic head 31 is pressed against the underwater ground, at which time the telescopic head 31 transmits the bottom touch signal to the multi-section telescopic unit 30, and the telescopic head 31 moves downward to drive the movement of the depth rope 41, so as to obtain new water depth data. The whole surveying device can be floated on the water surface through the rotating wheel 73 to realize mobile continuous measurement, so as to improve the measurement efficiency, the integrity and the accuracy of the underwater terrain.

[0040] Referring to Figure 1 and Figures 3-4 As shown, the rotating shaft 74 and the rotating wheel 73 are both provided with a cutter 75, and the cutter 75 has two blades. When the rotating wheel 73 moves on the river bottom, it will inevitably encounter underwater plants such as waterweeds, and the cutter 75 can cut the underwater plants to avoid the winding of the underwater plants on the rotating wheel 73 and the rotating shaft 74.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. An underwater topographic mapping device for engineering surveying, characterized in that, include: Floating unit (10); A substrate (20) is disposed on the floating unit (10); A multi-section telescopic unit (30) is horizontally slidably disposed on the substrate (20) and has a telescopic head (31) extending downward. A depth sounding rope (41) has its first end connected to the telescopic head (31) and its second end wrapped around and connected to the base plate (20). The depth sounding rope (41) is used to measure water depth.

2. The underwater topographic mapping device for engineering surveying according to claim 1, characterized in that, Also includes: A rope spool (42) is rotatably mounted on the base plate (20), and the second end of the sounding rope (41) is wound around and connected to the rope spool (42); A rotation driver (43) is provided on the base plate (20) for providing power to drive the rope shaft disc (42) to rotate.

3. The underwater topographic mapping device for engineering surveying according to claim 2, characterized in that, It also includes a rope tensioning unit (50), which comprises: The tensioning frame (51) is slidably disposed at the top of the multi-section telescopic unit (30): The tensioning shaft (52) is rotatably mounted on the tensioning frame (51) and is used to support the depth sounding rope (41) between the rope shaft disc (42) and the telescopic head (31). The tensioning elastic element (53) acts on the top of the multi-section telescopic unit (30) at one end and on the tensioning frame (51) at the other end. Under the elastic pushing action of the tensioning elastic element (53), the tensioning frame (51) can drive the tensioning shaft (52) and make the tensioning shaft (52) support the sounding rope (41) so that the sounding rope (41) is in a tensioned state.

4. The underwater topographic mapping device for engineering surveying according to claim 3, characterized in that, The rope tensioning unit (50) also includes: A pressure sensor (54) is located at one end of the tensioning elastic element (53). The pressure sensor (54) determines the tensioning state parameter of the sounding rope (41) by detecting the magnitude of the elastic force of the tensioning elastic element (53), and transmits the tensioning state parameter to the rotary driver (43) to control the start and stop of the rotary driver (43).

5. The underwater topographic mapping device for engineering surveying according to claim 3, characterized in that, Also includes: The anti-detachment roller (71) is rotatably disposed at the top of the multi-section telescopic unit (30) and is arranged parallel to the tensioning shaft (52). The anti-detachment roller (71) is used to press the depth measuring rope (41) extending from bottom to top against the outer peripheral wall of the tensioning shaft (52).

6. The underwater topographic mapping device for engineering surveying according to claim 1, characterized in that, The floating unit (10) includes: A floating frame (11), on which the base plate (20) is disposed; A floating block (12) is provided on the floating frame (11) to provide buoyancy for the floating frame (11).

7. The underwater topographic mapping device for engineering surveying according to claim 6, characterized in that, The number of floating frames (11) is several, and they are distributed in a circle around the outer periphery of the substrate (20); the number of floating blocks (12) is several; at least one of the floating blocks (12) is provided on any one of the floating frames (11).

8. The underwater topographic mapping device for engineering surveying according to claim 1, characterized in that, It also includes a buffer unit (60), which comprises: A buffer slide tube (61) is hinged to the substrate (20); The buffer slide rod (62) is hinged at one end to the top of the multi-section telescopic unit (30), and the other end is slidably connected to the buffer slide tube (61) through the buffer elastic element (63).

9. The underwater topographic mapping device for engineering surveying according to claim 8, characterized in that, Also includes: Two limiting rings (72) are spaced apart vertically and coaxially arranged, forming a limiting gap (721) between the two limiting rings (72) for the buffer slide tube (61) to pass through.

10. An underwater topographic mapping device for engineering surveying according to claim 3, characterized in that, Also includes: The rotating wheel (73) is rotatably connected to the lower end of the telescopic head (31) via the rotating shaft (74); A number of cutters (75) are respectively set on the rotating wheel (73) and the rotating shaft (74). The two cutters (75) set on the rotating wheel (73) and the rotating shaft (74) intersect to form a mesh.

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