Underwater base level measuring device and using method

Abstract

The invention provides an underwater base level measurement device and a use method, and relates to the technical field of underwater base level measurement, the device comprises a support frame, the device is stably erected above the water surface through a scaling ladder basket of a telescopic straight arm vehicle, the support frame comprises a vertically erected mounting rod and a baffle horizontally installed on the mounting rod, and the baffle is provided with a plurality of baffle plates; a through hole is vertically formed in the baffle in a penetrating manner; the measuring rope is wound on the supporting frame, the measuring rope penetrates through the through hole, and the length of the measuring rope located below the baffle can be adjusted by winding the measuring rope; the hook is fixed at the bottom of the measuring rope, and a positioning block is hung on the hook; the number of the sleeve rods is multiple, the sleeve rods are arranged on the measuring rope in a sleeving mode, the sleeve rods are located between the baffle and the positioning block, and the multiple sleeve rods can vertically abut against the position between the bottom of the baffle and the top of the positioning block by winding the measuring rope. The device has the effect of quickly and conveniently measuring the elevation of the underwater base layer.

Description

Technical Field

[0001] The present application relates to the technical field of underwater base elevation measurement, and in particular to an underwater base elevation measurement device and a use method thereof. Background Art

[0002] In the process of underwater bed riprap, underwater compaction and underwater base leveling measurement and control, two methods are usually used to measure and control the elevation. One is to use a high-precision depth sounder, but the purchase cost of the depth sounder is high, which is not conducive to accurate daily underwater elevation measurement. The other is to use the Beidou positioning system and the water weight to manually measure the water depth for construction measurement and control. The measurement method is to use the laying rails, and lay a leveling rail 0.5m inward from the front and back of the bottom. The leveling rails are arranged in the direction of the axis. Two pads are arranged on each track under each prefabricated component. The total station uses the measuring guide frame to measure the midpoint position and elevation. The measurement and control method is to use the auxiliary ship or buoy personnel to hold the measuring ruler at the upper end, the diver controls the position of the measuring ruler in the water, and the land personnel use the level instrument to observe, so as to measure the underwater base elevation. This method is cumbersome to measure, and it also requires the cooperation of divers, and the measurement takes a long time. Summary of the invention

[0003] In order to improve the problems of high cost and low efficiency when measuring the elevation of an underwater base layer, the present application provides an underwater base layer elevation measuring device and a method for using the device.

[0004] In the first aspect, the present application provides an underwater base elevation measurement device, which adopts the following technical solution:

[0005] An underwater base elevation measuring device, which needs to be used with a telescopic straight arm vehicle, includes

[0006] The support frame is stably erected above the water surface through the ladder basket of the telescopic straight arm vehicle, and the support frame includes a vertically erected mounting rod and a baffle plate horizontally installed on the mounting rod, and a through hole is vertically penetrated on the baffle plate;

[0007] The measuring rope is wound on the support frame, and the measuring rope is passed through the perforation. By winding the measuring rope, the length of the measuring rope below the baffle can be adjusted;

[0008] A hook is fixed to the bottom of the measuring rope, and a positioning block is hung on the hook; and

[0009] A plurality of sleeve rods are provided, which are sleeved on the measuring rope and located between the baffle and the positioning block. By winding the measuring rope, the plurality of sleeve rods can be vertically pressed between the bottom of the baffle and the top of the positioning block.

[0010] Furthermore, a slot for the measuring rope to pass through the sleeve rod is provided on one side of the sleeve rod, and a limiting member for limiting the measuring rope from escaping from the slot is provided on the sleeve rod.

[0011] Furthermore, the limiting member is configured as a C-shaped nut, and the end of the sleeve rod is provided with an external thread adapted to the C-shaped nut.

[0012] Furthermore, a plurality of scale lines are vertically arranged on the outer side wall of the sleeve rod.

[0013] Furthermore, a lifting ring for the hook to hang is arranged on the top of the positioning block, and when the sleeve rod is vertically pressed between the bottom of the baffle and the top of the positioning block, the lifting ring and the hook are both located inside the sleeve rod.

[0014] Furthermore, the baffle is mounted on the mounting rod in an adjustable height, and a locking member for locking the baffle is provided on one side of the mounting rod.

[0015] Furthermore, a supporting rod is arranged on the top of the mounting rod, and a winding wheel is arranged on one side of the mounting rod. One end of the measuring rope is wound on the winding wheel, and the other end is passed through the supporting rod and the baffle in sequence.

[0016] In a second aspect, the present application provides a method for using an underwater base elevation measurement device, based on the above-mentioned underwater base elevation measurement device, comprising the following steps:

[0017] Draw a plan for the area where the underwater base needs to be measured, and divide it into grids of different sizes according to the actual requirements of the site. At the same time, drive the telescopic boom truck to the measurement site, and install the support frame and measuring rope on its ladder basket;

[0018] Pass one end of the measuring rope through the hole on the baffle, and suspend the positioning block at the bottom of the measuring rope through a hook. According to the approximate depth of the measured water level, select a suitable number of sleeve rods and put them on the measuring rope in sequence. As the measuring rope is unwound, the positioning block is lowered toward the base surface, and several sleeve rods are stacked in sequence between the baffle and the positioning block. When the positioning block reaches the base surface, the measuring rope is reeled in and adjusted so that several sleeve rods are vertically pressed between the bottom of the baffle and the top of the positioning block. At this time, the measuring rope is in a taut state;

[0019] The personnel will calculate the elevation based on the reading on the rod and check it with the elevation of the control point, and then record it on the grid.

[0020] After the measurement is completed, loosen the measuring rope to make the positioning block automatically unhook, and retract the sleeve rod at the same time, and repeat the above steps to complete the measurement of the elevation of the remaining area;

[0021] Personnel adjust the elevation of the position that needs to be adjusted according to the recorded elevation and the position of the corresponding positioning block. For the position with large height deviation, the divers will re-fill it, and the position with small deviation will be manually adjusted by the divers;

[0022] After the adjustment, recheck the elevation of the position, and proceed to the next step until the elevation meets the construction requirements.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The device is easy to assemble, and various parts can be used repeatedly. At the same time, no diver is required to cooperate in the measurement, which reduces manpower input and costs. By sequentially putting a number of rods on the measuring rope and winding the measuring rope, the rods pull the measuring rope vertically, ensuring that the measuring rope under the block is always in a taut and vertical state. Therefore, according to the number of rods and the scale lines on the rods, the elevation of the underwater base surface in the current area can be accurately measured;

[0025] 2. A full-length notch is set on the sleeve rod, and it is used in conjunction with a C-shaped nut to change the process of the measuring rope sleeve, so that the sleeve rod can be quickly and conveniently sleeved on the measuring rope, thereby improving the assembly efficiency of the device;

[0026] 3. Several sets of rods can be connected end to end through C-shaped nuts to form a whole, and the height of the baffle on the mounting rod can be adjusted. There is no need to dive, just move the rod upward to achieve automatic unhooking of the positioning block, thereby achieving fast and portable positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the structure of the fixing rod, the mounting rod, the baffle, the perforation and the measuring rope in the embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the structure of the sleeve rod, notch, external thread and scale lines in the embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of the structure of the C-shaped nut in the embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of the structure of the measuring rope and the hook in the embodiment of the present application.

[0033] Figure 6 It is a schematic diagram of the structure of the positioning block and the lifting ring in the embodiment of the present application.

[0034] Figure numerals: 1. fixing rod; 2. mounting rod; 3. baffle; 4. through hole; 5. measuring rope; 6. hook; 7. positioning block; 8. sleeve rod; 9. notch; 10. C-shaped nut; 11. external thread; 12. scale line; 13. lifting ring; 14. locking piece; 15. supporting rod; 16. winding wheel; 17. ladder basket; 18. through hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The embodiments of the present application disclose an underwater base elevation measuring device and a method for using the device.

[0037] Embodiment 1, refer to Figure 1 , Figure 2 and Figure 3 The underwater base elevation measuring device needs to be used in conjunction with a telescopic straight arm vehicle, and includes a support frame, a measuring rope 5, a hook 6, a positioning block 7 and a sleeve rod 8, wherein the support frame is stably erected above the water surface through the ladder basket 17 of the telescopic straight arm vehicle; the support frame includes a fixed rod 1 stably connected to the ladder basket 17 and arranged horizontally, a mounting rod 2 installed vertically on the fixed rod 1, and a baffle 3 installed vertically on the mounting rod 2, a through hole 4 is opened on the baffle 3 in the vertical direction, the baffle 3 is arranged on the opposite surface from the fixed rod 1, and the baffle 3 is located above the fixed rod 1.

[0038] Reference Figure 2 , Figure 5 and Figure 6A support rod 15 is vertically installed on the top of the mounting rod 2. The support rod 15 is parallel and coplanar with the baffle 3. The support rod 15 is set to be hollow. A through hole 18 connected to the cavity of the support rod 15 is opened through the connection between the mounting rod 2 and the support rod 15. A winding wheel 16 is rotatably installed on the side wall of the mounting rod 2 close to one end of the fixed rod 1. The winding wheel 16 is located below the baffle 3. One end of the measuring rope 5 is wound on the winding wheel 16, and the other end passes through the through hole 18 on the mounting rod 2, the cavity of the support rod 15 and the through hole 4 on the baffle 3 in sequence and extends to the bottom of the fixed rod 1; by winding the measuring rope 5, the length of the measuring rope 5 below the baffle 3 can be adjusted. The hook 6 is stably tied to the bottom of the measuring rope 5, the center of the top of the positioning block 7 is set as a raised platform, and a lifting ring 13 connected to the hook 6 is pre-buried at the center of the top of the positioning block 7; by rotating the winding wheel 16, the measuring rope 5 can be retracted and released, so that the positioning block 7 can be hung and lowered to the underwater base surface of the area to be measured.

[0039] To quickly measure the elevation of the underwater base surface, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 There are several sleeve rods 8, and the number of sleeve rods 8 can be increased or decreased according to the measurement requirements. A plurality of scale lines 12 are vertically arranged on the outer wall of the sleeve rod 8, and the outer diameter of the sleeve rod 8 is larger than the aperture of the through hole 4 on the baffle 3, and the maximum size of the hook 6 and the lifting ring 13 is smaller than the inner diameter of the sleeve rod 8. During measurement, it is necessary to sequentially sleeve a plurality of rods 8 on the measuring rope 5 between the baffle 3 and the positioning block 7, so that by winding up the measuring rope 5, a plurality of rods 8 can be vertically pressed against the bottom of the baffle 3 and the top of the positioning block 7, that is, the top of the uppermost rod 8 is vertically pressed against the lower surface of the baffle 3, and the bottom of the lowermost rod 8 is vertically pressed against the raised platform at the center of the top of the positioning block 7; at this time, the hook 6 and the lifting ring 13 are both located in the lowermost rod 8, avoiding the problem of the lifting ring 13 being unhooked, thereby ensuring that the measuring rope 5 located below the block is always in a taut and vertical state, so that according to the number of rods 8 and the scale lines 12 on the rods 8, the elevation of the underwater base surface in the current area can be accurately measured.

[0040] In order to facilitate the rapid installation of a plurality of sleeve rods 8 on the measuring rope 5, refer to Figure 3 and Figure 4, a notch 9 is provided on one side of the sleeve rod 8 for the measuring rope 5 to pass through the sleeve rod 8, so that the cross section of the sleeve rod 8 is C-shaped. In order to prevent the measuring rope 5 from slipping out of the notch 9 of the sleeve rod 8, a limiting member for limiting the slipping out of the measuring rope 5 from the notch 9 is provided on the sleeve rod 8. As for the setting of the limiting member, in the embodiment of the present application, the limiting member is set as a C-shaped nut 10, and the outer walls of both ends of the sleeve rod 8 are provided with external threads 11 adapted to the C-shaped nut 10. First, the C-shaped nut 10 is threadedly sleeved on the end of the sleeve rod 8, and the notch on the C-shaped nut 10 is aligned with the notch 9 on the sleeve rod 8. At this time, the sleeve rod 8 can be quickly sleeved on the measuring rope 5 through the notch 9; then the C-shaped nut 10 is rotated so that the notch on the C-shaped nut 10 is staggered with the notch 9 on the sleeve rod 8, thereby limiting the slipping out of the measuring rope 5 from the notch 9, ensuring that the sleeve rod 8 can always be sleeved on the measuring rope 5. In other embodiments, the limiting member may be configured as a clamp or a cable tie detachably mounted on the sleeve rod 8 .

[0041] After completing the elevation measurement of the underwater base surface in the current area, if there is a large deviation, personnel need to process the underwater base surface in the current area according to the lowering position of the positioning block 7. For this purpose, the positioning block 7 needs to be detached from the hook 6. In order to realize the automatic unhooking of the positioning block 7, refer to Figure 2 , Figure 3 and Figure 4 , the external threads 11 on both ends of the sleeve rod 8 are the same, and when two adjacent sleeve rods 8 are sequentially sleeved on the measuring rope 5, the two adjacent sleeve rods 8 can be connected together by the C-shaped nut 10, and the ends of the two adjacent sleeve rods 8 that are close to each other abut against each other. In this way, the multiple sleeve rods 8 sleeved on the measuring rope 5 can be connected end to end to form a whole. The baffle 3 is mounted on the mounting rod 2 in an adjustable height, and a locking member 14 for locking the baffle 3 is provided on one side of the mounting rod 2. The locking member 14 is specifically configured as a fastening bolt. One end of the baffle 3 is slidably sleeved on the mounting rod 2, and the fastening bolt thread penetrates the side wall of the baffle 3 and abuts against the side wall of the mounting rod 2 to achieve locking of the baffle 3. When it is necessary to realize the automatic unhooking of the positioning block 7, the fastening bolts can be loosened first, and then the baffle plate 3 is moved upward. At this time, the uppermost sleeve rod 8 is no longer pressed against the baffle plate 3, and then the sleeve rod 8 is moved upward. At this time, multiple sleeve rods 8 connected as a whole are moved upward synchronously, so that the hook 6 and the ring 13 are moved out of the lowermost sleeve rod 8, and finally the sleeve rod 8 is swung left and right, so that the sleeve rod 8 drives the hook 6 on the measuring rope 5 to fall off the ring 13 on the positioning block 7, and the positioning block 7 is automatically unhooked. After the automatic unhooking of the positioning block 7 is completed, the measuring rope 5 can be reeled in, and several sleeve rods 8 can be recovered at the same time, and then the underwater base surface of the current area can be processed in time according to the position of the positioning block 7.

[0042] Embodiment 2: This embodiment of the application further provides a method for using an underwater base elevation measuring device, and the method includes S1 to S6.

[0043] S1, draw a plan of the area where the underwater base needs to be measured, divide it into grids of different sizes according to the actual requirements of the site, and drive the telescopic boom truck to the measurement site, stably connect the fixed rod 1 with the ladder basket 17 of the telescopic boom truck, so that the fixed rod 1 is horizontally erected above the water surface of the area to be measured;

[0044] S2, one end of the measuring rope 5 is wound on the winding wheel 16, and the other end is passed through the through hole 18 on the mounting rod 2, the cavity of the supporting rod 15 and the through hole 4 on the baffle 3 in sequence and extended to the bottom of the fixing rod 1, and then hung with the lifting ring 13 on the positioning block 7 through the hook 6;

[0045] S3, mark the positioning block 7, and rotate the winding wheel 16 at the same time, so that the positioning block 7 is suspended and lowered. At the same time, according to the approximate depth of the measured water level, select a suitable number of sleeve rods 8 and C-shaped nuts 10. When several sleeve rods 8 are sequentially sleeved on the measuring rope 5, firstly thread the C-shaped nut 10 on the end of the sleeve rod 8, and align the notch on the C-shaped nut 10 with the notch 9 on the sleeve rod 8. At this time, the sleeve rod 8 can be quickly sleeved on the measuring rope 5 between the baffle 3 and the positioning block 7 through the notch 9; then rotate the C-shaped nut 10 so that the notch on the C-shaped nut 10 is staggered with the notch 9 on the sleeve rod 8, thereby limiting the measuring rope 5 from escaping from the notch 9, ensuring that the sleeve rod 8 can always be sleeved on the measuring rope 5; at the same time, two adjacent sleeve rods 8 are connected together by the C-shaped nut 10, and the ends of the two adjacent sleeve rods 8 that are close to each other abut against each other. In this way, several sleeve rods 8 sleeved on the measuring rope 5 can be connected end to end to form a whole;

[0046] S4, when the positioning block 7 reaches the base surface, the measuring rope 5 is reeled and adjusted by rotating the reeling wheel 16, so that a plurality of sleeve rods 8 are vertically pressed against the bottom of the baffle 3 and the top of the positioning block 7. At this time, the measuring rope 5 is in a taut state, the top of the uppermost sleeve rod 8 is vertically pressed against the lower surface of the baffle 3, and the bottom of the lowermost sleeve rod 8 is vertically pressed against the raised platform at the center of the top of the positioning block 7. The hook 6 and the lifting ring 13 are both located in the lowermost sleeve rod 8; according to the number of sleeve rods 8 and the scale lines 12 on the sleeve rods 8, the elevation of the underwater base surface of the current area can be accurately measured;

[0047] S5, after completing the elevation measurement of the underwater base surface of the current area, if there is a large deviation, personnel need to process the underwater base surface of the current area according to the lowering position of the positioning block 7. At this time, the fastening bolts can be loosened first, and then the baffle plate 3 is moved upward. At this time, the uppermost sleeve rod 8 is no longer pressed against the baffle plate 3, and then the sleeve rod 8 is moved upward, and the multiple sleeve rods 8 connected as a whole are moved upward synchronously, so that the hook 6 and the ring 13 are removed from the lowermost sleeve rod 8, and finally the sleeve rod 8 is swung left and right, so that the sleeve rod 8 drives the hook 6 on the measuring rope 5 to fall off the ring 13 on the positioning block 7, and the positioning block 7 is automatically unhooked;

[0048] S6, after the automatic unhooking of the positioning block 7 is completed, the measuring rope 5 can be reeled in, and a plurality of sleeve rods 8 can be recovered at the same time, and then the personnel can process the underwater base surface of the current area in time according to the position of the positioning block 7.

[0049] The implementation principle of the underwater base elevation measurement device and the use method of the embodiment of the present application is as follows: first, the support frame is erected above the water surface of the area to be measured by a telescopic straight arm vehicle, and the measuring rope 5 and the positioning block 7 are installed at the same time, and the positioning block 7 is marked accordingly; then, according to the approximate depth of the measured water level, a suitable number of sleeve rods 8 and C-shaped nuts 10 are selected, and while lowering the positioning block 7, a plurality of sleeve rods 8 are sequentially sleeved on the measuring rope 5, and the plurality of sleeve rods 8 are connected end to end by the C-shaped nuts 10 to form a whole, until the positioning block 7 reaches the base The measuring rope 5 is then wound up and adjusted by rotating the winding wheel 16, so that a number of sleeve rods 8 are vertically pressed against the bottom of the baffle 3 and the top of the positioning block 7. At this time, the measuring rope 5 is in a taut state, and the top of the uppermost sleeve rod 8 is vertically pressed against the lower surface of the baffle 3, and the bottom of the lowermost sleeve rod 8 is vertically pressed against the raised platform at the center of the top of the positioning block 7. The hook 6 and the lifting ring 13 are both located in the lowermost sleeve rod 8; according to the number of sleeve rods 8 and the scale lines 12 on the sleeve rods 8, the elevation of the underwater base surface in the current area can be accurately measured.

[0050] After completing the elevation measurement of the underwater base surface of the current area, if there is a large deviation, personnel need to process the underwater base surface of the current area according to the lowering position of the positioning block 7. At this time, the fastening bolts can be loosened first, and then the baffle 3 is moved upward. At this time, the uppermost sleeve rod 8 is no longer pressed against the baffle 3, and then the sleeve rod 8 is moved upward, and multiple sleeve rods 8 connected as a whole are moved upward synchronously, so that the hook 6 and the ring 13 are removed from the lowermost sleeve rod 8. Finally, the sleeve rod 8 is swung left and right, so that the sleeve rod 8 drives the hook 6 on the measuring rope 5 to fall off the ring 13 on the positioning block 7, and the positioning block 7 is automatically unhooked. After completing the automatic unhooking of the positioning block 7, the measuring rope 5 can be reeled in, and several sleeve rods 8 can be recovered at the same time. Then, personnel can process the underwater base surface of the current area in time according to the position of the positioning block 7.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An underwater base elevation measuring device, which needs to be used with a telescopic straight arm vehicle, is characterized by: include The support frame is stably erected above the water surface through the ladder basket of the telescopic straight arm vehicle, and the support frame includes a vertically erected mounting rod and a baffle plate horizontally installed on the mounting rod, and a through hole is vertically penetrated on the baffle plate; The measuring rope is wound on the support frame, and the measuring rope is passed through the perforation. By winding the measuring rope, the length of the measuring rope below the baffle can be adjusted; A hook is fixed to the bottom of the measuring rope, and a positioning block is hung on the hook; and A plurality of sleeve rods are provided, which are sleeved on the measuring rope and located between the baffle and the positioning block. By winding the measuring rope, the plurality of sleeve rods can be vertically pressed between the bottom of the baffle and the top of the positioning block.

2. The underwater base elevation measuring device according to claim 1, characterized in that: A notch for the measuring rope to pass through the sleeve rod is provided on one side of the sleeve rod, and a limiting piece for limiting the measuring rope from escaping from the notch is provided on the sleeve rod.

3. The underwater base elevation measuring device according to claim 2, characterized in that: The limiting member is configured as a C-shaped nut, and the end of the sleeve rod is provided with an external thread matched with the C-shaped nut.

4. The underwater base elevation measuring device according to claim 1, characterized in that: A plurality of scale lines are vertically arranged on the outer side wall of the sleeve rod.

5. The underwater base elevation measuring device according to claim 1, characterized in that: A lifting ring for hooking is arranged on the top of the positioning block. When the sleeve rod is vertically pressed between the bottom of the baffle and the top of the positioning block, the lifting ring and the hook are both located in the sleeve rod.

6. The underwater base elevation measuring device according to claim 1, characterized in that: The baffle is mounted on the mounting rod in an adjustable height, and a locking piece for locking the baffle is arranged on one side of the mounting rod.

7. The underwater base elevation measuring device according to claim 1, characterized in that: A supporting rod is arranged on the top of the installation rod, and a winding wheel is arranged on one side of the installation rod. One end of the measuring rope is wound on the winding wheel, and the other end is passed through the supporting rod and the baffle in sequence.

8. A method for using an underwater base elevation measurement device, based on an underwater base elevation measurement device as claimed in any one of claims 1 to 7, characterized in that: The following steps are included: Draw a plan for the area where the underwater base needs to be measured, and divide it into grids of different sizes according to the actual requirements of the site. At the same time, drive the telescopic boom truck to the measurement site, and install the support frame and measuring rope on its ladder basket; Pass one end of the measuring rope through the hole on the baffle, and suspend the positioning block at the bottom of the measuring rope through a hook. According to the approximate depth of the measured water level, select a suitable number of sleeve rods and put them on the measuring rope in sequence. As the measuring rope is unwound, the positioning block is lowered toward the base surface, and several sleeve rods are stacked in sequence between the baffle and the positioning block. When the positioning block reaches the base surface, the measuring rope is reeled in and adjusted so that several sleeve rods are vertically pressed between the bottom of the baffle and the top of the positioning block. At this time, the measuring rope is in a taut state; The personnel will calculate the elevation based on the reading on the rod and check it with the elevation of the control point, and then record it on the grid. After the measurement is completed, loosen the measuring rope to make the positioning block automatically unhook, and retract the sleeve rod at the same time, and repeat the above steps to complete the measurement of the elevation of the remaining area; Personnel adjust the elevation of the position that needs to be adjusted according to the recorded elevation and the position of the corresponding positioning block. For the position with large height deviation, the divers will re-fill it, and the position with small deviation will be manually adjusted by the divers; After the adjustment, recheck the elevation of the position, and proceed to the next step until the elevation meets the construction requirements.

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