A ranging device for construction engineering supervision

By combining the quick-fix device with the docking parts, the problem of time-consuming connection between the RTK measuring instrument and the adjustment rod is solved, enabling rapid installation and disassembly, improving efficiency, avoiding equipment damage, and enhancing structural stability.

CN224397490UActive Publication Date: 2026-06-23HEBEI SANHUAN ENG CONSULTING CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HEBEI SANHUAN ENG CONSULTING CO LTD
Filing Date
2025-07-08
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing RTK measuring instruments are time-consuming and prone to damage when connected to the adjustment rod, affecting installation and disassembly efficiency.

Method used

A quick-fixing device is adopted, including a docking cylinder, a retaining ring, a self-locking assembly, and a control component. Through the cooperation of the quick-fixing device and the docking component, the machine body and the adjusting rod can be quickly connected and disassembled.

Benefits of technology

It improves the efficiency of installation and disassembly during measurement, avoids equipment damage caused by long-term twisting, and enhances structural stability and rotational comfort.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a range finder for building engineering supervision relates to building engineering surveying technical field, including support pole, adjusting lever and organism, adjusting lever sets up in the inside of support pole, and upper end extends out support pole, and with support pole swing joint, organism sets up in adjusting lever upper end. The utility model discloses through setting up support pole, adjusting lever, organism, quick fixing device, butt -joint cylinder, baffle ring, self -locking assembly, controlling piece, butt -joint piece, rubber antiskid pad, spacing sliding slot and spacing slide's cooperation and use, have improved or solved the RTK measuring instrument of existing to a certain extent when installing and connecting with its adjusting lever is more troublesome, needs repeatedly rotating, installs and connects through the cooperation of screw thread, this not only time -consuming, influences its installation and subsequent disassembly and storage's work efficiency, and long -term screwing or screwing skewing over force, also easy to cause the problem of silk damage equipment.
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Description

Technical Field

[0001] This utility model relates to the field of building engineering measurement technology, specifically a distance measuring device for building engineering supervision. Background Technology

[0002] RTK (Real-Time Kinematic) measuring instruments play a crucial role in distance measurement devices used in construction engineering supervision. By receiving satellite signals and combining them with correction data provided by a base station, they achieve real-time dynamic high-precision positioning and distance measurement, with measurement accuracy reaching the centimeter or even millimeter level. In construction engineering supervision, RTK measuring instruments are commonly used for construction layout and elevation control at large construction sites, as well as coordinate measurement and topographic mapping for road and bridge projects. Using RTK measuring instruments, supervisors can quickly and accurately verify whether the construction location is consistent with the design drawings, and can also accurately calculate the amount of earthwork, greatly improving the efficiency and accuracy of supervision work and ensuring that the construction meets the specifications.

[0003] The existing RTK measuring instrument is quite troublesome to install and connect with its adjusting rod. It requires repeated rotation to install and connect through the threaded engagement. This is not only time-consuming and affects the efficiency of installation and subsequent disassembly and storage, but also the long-term twisting or excessive force of twisting can easily cause stripping and damage to the equipment. Utility Model Content

[0004] To address the problems mentioned in the background art, the purpose of this utility model is to provide a distance measuring device for construction engineering supervision. This device facilitates quick connection and fixation of the body and adjusting rod, improving installation efficiency during measurement and disassembly / storage efficiency after use. It also improves or solves, to some extent, the cumbersome installation and connection of existing RTK measuring instruments with their adjusting rods, which requires repeated rotations to achieve the connection through threaded engagement. This is not only time-consuming and affects the efficiency of installation and subsequent disassembly / storage, but also prone to stripping and damaging the equipment due to prolonged twisting or excessive force.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a distance measuring device for construction engineering supervision, comprising a support rod, an adjusting rod, and a body. The adjusting rod is disposed inside the support rod, with its upper end extending out of the support rod and movably connected to it. The body is disposed on the upper end of the adjusting rod, and a quick-fixing device is provided on the upper end of the adjusting rod. The quick-fixing device includes a docking cylinder, a retaining ring, a self-locking component, and a control component. A docking part is provided on the lower surface of the body, and the docking part is fixedly connected to the body and adapted to the docking cylinder.

[0006] In a preferred embodiment of this invention, the docking cylinder is fixedly connected to the upper end of the adjusting rod, the retaining ring is fixedly connected to the upper end of the docking cylinder, the number of self-locking components is two, and they are respectively arranged on the left and right sides of the upper end of the docking cylinder, and the control component is sleeved on the lower end surface of the docking cylinder.

[0007] In a preferred embodiment of this invention, the self-locking assembly includes a positioning rod, a locking head, a push spring, and a pressure rod. Two positioning rods are fixedly connected to the front and rear sides of the right side surface of the docking cylinder, respectively. The right ends of the two positioning rods are fixedly connected to the inner wall of the retaining ring. The locking head is sleeved on the surfaces of the two positioning rods and slidably connected to them. The left end of the locking head extends into the interior of the docking cylinder and slidably connects to it. Two push springs are sleeved on the surfaces of the two positioning rods, respectively. The left and right ends of the two push springs are fixedly connected to the right side of the locking head and the right side inner wall of the retaining ring, respectively. The pressure rod is fixedly connected to the lower surface of the right end of the locking head.

[0008] As a preferred embodiment of this utility model, the docking component includes a fixed shaft and a slot. The fixed shaft is fixedly connected to the lower surface of the machine body, and its lower end extends into the interior of the docking cylinder and is movably connected to the docking cylinder. There are two slots, which are respectively opened on the left and right sides of the fixed shaft. The two slots correspond to and are adapted to one end of the two lock heads that extend into the interior of the docking cylinder.

[0009] As a preferred embodiment of this utility model, the control component includes a rotating cylinder and a stroke groove. The rotating cylinder is sleeved on the lower end surface of the docking cylinder and is rotatably connected to the docking cylinder. There are two stroke grooves, which are respectively opened on the left and right sides of the upper surface of the rotating cylinder. The lower ends of the two pressure rods extend into the two stroke grooves and are movably connected to the stroke grooves.

[0010] As a preferred embodiment of this invention, a rubber anti-slip pad is fitted onto the lower surface of the rotating drum, and the rubber anti-slip pad is fixedly connected to the rotating drum.

[0011] As a preferred embodiment of this utility model, two limiting slide grooves are provided at the lower end of the docking cylinder, and limiting slide strips are fixedly connected to both the upper and lower ends of the inner wall of the rotating cylinder. The two limiting slide strips extend into the two limiting slide grooves respectively and are slidably connected to the limiting slide grooves.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model, through the coordinated use of a support rod, adjusting rod, body, quick-fixing device, docking cylinder, retaining ring, self-locking component, positioning rod, lock head, push spring, pressure rod, control component, rotating cylinder, stroke groove, docking component, fixed shaft, slot, rubber anti-slip pad, limit slide groove and limit slide bar, improves or solves to a certain extent the problem of the existing RTK measuring instrument having a troublesome installation connection with its adjusting rod, which requires repeated rotation to install and connect through thread engagement. This is not only time-consuming and affects the efficiency of installation and subsequent disassembly and storage, but also the long-term twisting or excessive force of twisting can easily cause stripping and damage to the equipment.

[0014] 2. This utility model, by setting up a quick-fixing device and a docking component, enables the quick installation and fixation of the machine body with the adjusting rod, thereby facilitating the quick assembly and disassembly of the machine body and improving the efficiency of installation during measurement and disassembly and storage after measurement. The two self-locking components are designed to cooperate with the two slots when the fixed shaft is inserted into the docking cylinder, thereby enabling quick locking of the fixed shaft and facilitating the quick installation and fixation of the machine body. Fixing can be completed simply by inserting the fixed shaft into the docking cylinder.

[0015] 3. This utility model uses a control component to link and control the two self-locking components, thereby driving them to open and close, quickly releasing the lock head from the slot, facilitating rapid disassembly and improving storage efficiency. The rubber anti-slip pad enhances the friction between the hand and the rotating drum, facilitating rotation, preventing slippage, and improving rotational comfort. The limiting groove and limiting strip work together to limit the rotation of the drum, effectively preventing slippage and improving structural stability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the measuring instrument of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of the measuring instrument;

[0018] Figure 3 This is a schematic diagram of the cross-sectional planar structure;

[0019] Figure 4 This is a schematic diagram of the exploded structure of a fixed device.

[0020] In the diagram: 1. Support rod; 2. Adjusting rod; 3. Machine body; 4. Quick-fixing device; 41. Connecting cylinder; 42. Retaining ring; 43. Self-locking assembly; 431. Positioning rod; 432. Lock head; 433. Push spring; 434. Pressure rod; 44. Control component; 441. Rotary cylinder; 442. Stroke groove; 5. Connecting component; 51. Fixed shaft; 52. Slot; 6. Rubber anti-slip pad; 7. Limiting slide groove; 8. Limiting slide bar. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0024] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0025] Example 1

[0026] Reference Figure 1-4 This is the first embodiment of the present utility model, which provides a distance measuring device for construction engineering supervision, including a support rod 1, an adjusting rod 2 and a body 3. The adjusting rod 2 is located inside the support rod 1 and extends out of the support rod 1 and is movably connected to the support rod 1. The body 3 is located at the upper end of the adjusting rod 2, and a quick fixing device 4 is provided at the upper end of the adjusting rod 2.

[0027] The quick-fixing device 4 includes a docking cylinder 41, a retaining ring 42, a self-locking component 43, and a control component 44. A docking component 5 is provided on the lower surface of the machine body 3. The docking component 5 is fixedly connected to the machine body 3 and is compatible with the docking cylinder 41.

[0028] The docking cylinder 41 is fixedly connected to the upper end of the adjusting rod 2, the retaining ring 42 is fixedly connected to the upper end of the docking cylinder 41, there are two self-locking components 43, which are respectively set on the left and right sides of the upper end of the docking cylinder 41, and the control component 44 is sleeved on the lower end surface of the docking cylinder 41.

[0029] Specifically, by setting up a quick-fixing device 4 and a docking part 5, the machine body 3 can be quickly installed and fixed with the adjusting rod 2, which facilitates the quick assembly and disassembly of the machine body 3 and improves the efficiency of installation during measurement and disassembly and storage after measurement.

[0030] Furthermore, the docking component 5 is used to cooperate with the docking cylinder 41 and be inserted into the docking cylinder 41. At the same time, the two self-locking components 43 cooperate with the two slots 52 of the docking component 5 to fix the fixed shaft 51 inside the docking cylinder 41, thereby quickly fixing the machine body 3 and the adjusting rod 2. The control component 44 is used to control the opening and closing movement of the two self-locking components 43 to release the connection that fixes the fixed shaft 51, thereby facilitating quick disassembly.

[0031] Example 2

[0032] The second embodiment of this utility model provides a distance measuring device for construction engineering supervision. The self-locking component 43 includes a positioning rod 431, a locking head 432, a push spring 433, and a pressure rod 434. There are two positioning rods 431, which are fixedly connected to the front and rear sides of the right side surface of the docking cylinder 41, respectively. The right ends of the two positioning rods 431 are fixedly connected to the inner wall of the retaining ring 42. The locking head 432 is sleeved on the surface of the two positioning rods 431 and is slidably connected to the positioning rods 431. The left end of the locking head 432 extends into the interior of the docking cylinder 41 and is slidably connected to the docking cylinder 41. There are two push springs 433, which are sleeved on the surface of the two positioning rods 431, respectively. The left and right ends of the two push springs 433 are fixedly connected to the right side of the locking head 432 and the inner wall of the right side of the retaining ring 42, respectively. The pressure rod 434 is fixedly connected to the lower surface of the right end of the locking head 432.

[0033] The docking component 5 includes a fixed shaft 51 and a slot 52. The fixed shaft 51 is fixedly connected to the lower surface of the body 3, and its lower end extends into the docking cylinder 41 and is movably connected to the docking cylinder 41. There are two slots 52, which are respectively opened on the left and right sides of the fixed shaft 51. The two slots 52 correspond to and are adapted to the ends of the two locking heads 432 that extend into the docking cylinder 41.

[0034] Specifically, by setting two self-locking components 43, when the fixed shaft 51 is inserted into the docking cylinder 41, it cooperates with two slots 52 to quickly lock the fixed shaft 51, thereby facilitating the quick installation and fixation of the machine body 3. Fixing can be completed simply by inserting the fixed shaft 51 into the docking cylinder 41.

[0035] Furthermore, during installation, the fixing shaft 51 fixed at the lower end of the body 3 is inserted into the docking cylinder 41. As the fixing shaft 51 is inserted downwards, it will squeeze the two locking heads 432, causing the two locking heads 432 to be squeezed on the surface of the positioning rod 431 and move outwards from the docking cylinder 41. At the same time, the movement is countered by the elastic force of the push spring 433, which is squeezed and compressed. After the fixing shaft 51 is fully inserted to the bottom, the positions of the two locking heads 432 will correspond to the positions of the two slots 52. At this time, the locking heads 432 are no longer squeezed, and the push spring 433 will quickly rebound, pushing the two locking heads 432 into the two slots 52, thereby engaging the fixing shaft 51 and completing the installation and fixing of the body 3.

[0036] Example 3

[0037] The third embodiment of this utility model provides a distance measuring device for construction engineering supervision. The control component includes a rotating cylinder and a stroke groove. The rotating cylinder is sleeved on the lower end surface of the docking cylinder and is rotatably connected to the docking cylinder. There are two stroke grooves, which are respectively opened on the left and right sides of the upper surface of the rotating cylinder. The lower ends of two pressure rods extend into the two stroke grooves and are movably connected to the stroke grooves. A rubber anti-slip pad is sleeved on the lower end surface of the rotating cylinder and is fixedly connected to the rotating cylinder.

[0038] Two limiting grooves are provided at the lower end of the docking cylinder. Limiting slide bars are fixedly connected to the upper and lower ends of the inner wall of the rotating cylinder. The two limiting slide bars extend into the two limiting grooves respectively and are slidably connected with the limiting grooves.

[0039] Specifically, the control component 44 is used to control the two self-locking components 43 in a coordinated manner, thereby driving the two self-locking components 43 to open and close, quickly releasing the engagement between the lock head 432 and the slot 52, thus facilitating quick disassembly and improving storage efficiency. The rubber anti-slip pad 6 is used to enhance the friction between the hand and the rotating drum 441 when rotating, making it easier to rotate the drum 441, preventing slippage, and improving rotation comfort. The cooperation between the limiting slide groove 7 and the limiting slide strip 8 is used to limit the rotation of the drum 441, effectively preventing slippage during rotation and improving structural stability.

[0040] Furthermore, during subsequent disassembly, by holding the rubber anti-slip pad 6, the rotating drum 441 is rotated. As the rotating drum 441 rotates, the limiting slide bar 8 slides inside the limiting slide groove 7, which can limit the rotating drum 441 and prevent it from detaching from the surface of the docking drum 41. The rotating drum 441 is rotated, causing the two stroke grooves 442 to rotate. As the two stroke grooves 442 rotate, their inner walls press against the two internal pressure rods 434. The pressure rods 434 are pressed, causing the two locking heads 432 to move outward from the docking drum 41 against the elastic force of the push spring 433 on the surface of the positioning rod 431, so that they move out from inside the two slots 52 and engage with the fixed shaft 51. Then, the machine body 3, together with the fixed shaft 51, is pulled upward from inside the docking drum 41, and the machine can be disassembled from the outside.

[0041] Working principle:

[0042] During installation, the fixing shaft 51, which is fixed at the lower end of the body 3, is inserted into the docking cylinder 41. As the fixing shaft 51 is inserted downwards, it compresses the two locking heads 432, causing them to move outwards from the docking cylinder 41 against the surface of the positioning rod 431. Simultaneously, this movement counteracts the spring force of the push spring 433, compressing it. After the fixing shaft 51 is fully inserted, the positions of the two locking heads 432 correspond to the positions of the two slots 52. At this point, the locking heads 432 are no longer compressed, and the push spring 433 quickly rebounds, pushing the two locking heads 432 into the slots 52, thus engaging the fixing shaft 51 and completing the installation and fixation of the body 3. During subsequent disassembly, by holding the rubber... Position the anti-slip pad 6, then rotate the drum 441. As the drum 441 rotates, the limiting slide bar 8 slides inside the limiting groove 7, which can limit the drum 441 and prevent it from detaching from the surface of the docking drum 41. The rotation of the drum 441 drives the two stroke grooves 442 to rotate. As the two stroke grooves 442 rotate, their inner walls press against the two internal pressure rods 434. The pressure rods 434 are pressed, causing the two locking heads 432 to move outward from the docking drum 41 against the spring force of the push spring 433 on the surface of the positioning rod 431, so that they move out from inside the two slots 52 and engage with the fixed shaft 51. Then, the machine body 3 together with the fixed shaft 51 is pulled upward from inside the docking drum 41, and the machine can be disassembled from the outside.

[0043] In summary, by using the support rod 1, adjusting rod 2, machine body 3, quick fixing device 4, docking cylinder 41, retaining ring 42, self-locking component 43, positioning rod 431, lock head 432, push spring 433, pressure rod 434, control component 44, rotating cylinder 441, stroke groove 442, docking component 5, fixed shaft 51, slot 52, rubber anti-slip pad 6, limit slide groove 7, and limit slide strip 8 in combination, the machine body and adjusting rod are quickly connected and fixed, improving the efficiency of installation during measurement and disassembly and storage after work.

[0044] The push spring 433 used in this application can be additionally equipped with protective measures known in the art under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, which are commonly used by those skilled in the art.

[0045] It should be noted that the push spring 433 is a device or equipment existing in the prior art, or a device or equipment that can be implemented by the prior art. The power supply, connection method, usage method, power source, fixing method, installation method, control method, etc. of the device, as well as the materials of each accessory and the selection of various parameters are all common knowledge to those skilled in the art, and therefore will not be described in detail in this application document.

[0046] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0047] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0048] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A distance measuring device for construction engineering supervision, comprising a support rod (1), an adjusting rod (2), and a body (3), wherein the adjusting rod (2) is disposed inside the support rod (1) and extends out of the support rod (1) and is movably connected to the support rod (1), and the body (3) is disposed at the upper end of the adjusting rod (2), characterized in that: The upper end of the adjusting rod (2) is provided with a quick fixing device (4); The quick-fixing device (4) includes a docking cylinder (41), a retaining ring (42), a self-locking component (43), and a control component (44). A docking component (5) is provided on the lower surface of the body (3). The docking component (5) is fixedly connected to the body (3) and is compatible with the docking cylinder (41).

2. The distance measuring device for construction engineering supervision according to claim 1, characterized in that: The docking cylinder (41) is fixedly connected to the upper end of the adjusting rod (2), the retaining ring (42) is fixedly connected to the upper end of the docking cylinder (41), there are two self-locking components (43), which are respectively set on the left and right sides of the upper end of the docking cylinder (41), and the control component (44) is sleeved on the lower end surface of the docking cylinder (41).

3. The distance measuring device for construction engineering supervision according to claim 1, characterized in that: The self-locking assembly (43) includes a positioning rod (431), a lock head (432), a push spring (433), and a pressure rod (434). There are two positioning rods (431), which are fixedly connected to the front and rear sides of the right side surface of the docking cylinder (41). The right ends of the two positioning rods (431) are fixedly connected to the inner wall of the retaining ring (42). The lock head (432) is sleeved on the surface of the two positioning rods (431) and is slidably connected to the positioning rods (431). The left end of the lock head (432) extends into the interior of the docking cylinder (41) and is slidably connected to the docking cylinder (41). There are two push springs (433), which are sleeved on the surface of the two positioning rods (431). The left and right ends of the two push springs (433) are fixedly connected to the right side of the lock head (432) and the right side inner wall of the retaining ring (42), respectively. The pressure rod (434) is fixedly connected to the lower surface of the right end of the lock head (432).

4. A distance measuring device for construction engineering supervision according to claim 3, characterized in that: The docking component (5) includes a fixed shaft (51) and a slot (52). The fixed shaft (51) is fixedly connected to the lower surface of the body (3) and its lower end extends into the docking cylinder (41) and is movably connected to the docking cylinder (41). There are two slots (52), which are respectively opened on the left and right sides of the fixed shaft (51). The two slots (52) correspond to and are adapted to the ends of the two lock heads (432) that extend into the docking cylinder (41).

5. A distance measuring device for construction engineering supervision according to claim 3, characterized in that: The control component (44) includes a rotating cylinder (441) and a stroke groove (442). The rotating cylinder (441) is sleeved on the lower surface of the docking cylinder (41) and is rotatably connected to the docking cylinder (41). There are two stroke grooves (442), which are respectively opened on the left and right sides of the upper surface of the rotating cylinder (441). The lower ends of the two pressure rods (434) extend into the two stroke grooves (442) respectively and are movably connected to the stroke grooves (442).

6. A distance measuring device for construction engineering supervision according to claim 5, characterized in that: A rubber anti-slip pad (6) is fitted on the lower surface of the rotating drum (441), and the rubber anti-slip pad (6) is fixedly connected to the rotating drum (441).

7. A distance measuring device for construction engineering supervision according to claim 5, characterized in that: The lower end of the docking cylinder (41) has two limiting grooves (7). The upper and lower ends of the inner wall of the rotating cylinder (441) are fixedly connected to limiting slide bars (8). The two limiting slide bars (8) extend into the two limiting grooves (7) respectively and are slidably connected to the limiting grooves (7).