Project cost surveying and mapping ruler

By designing the combination of installation grooves, limit blocks and locking parts on the mapping ruler, combining fluorescent agents and multifunctional structures, the existing mapping ruler has solved the accuracy, stability and convenience, and efficient mapping and painting under dark light conditions are achieved.

CN223192239UActive Publication Date: 2025-08-05HEILONGJIANG YISHUN ENGINEERING COST CONSULTING CO LTD
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Patent Information

Application Number
CN202422451870.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-10
Publication Date
2025-08-05
Estimated Expiration
2034-10-10

AI Technical Summary

Technical Problem

The existing surveying and mapping rulers for engineering cost use have poor accuracy and stability in surveying and mapping, poor night use effect, simple structure and inconvenient use.

Method used

A surveying ruler for engineering cost is designed, and the second foot section is slidingly installed on the first foot section using the combination of installation grooves and limit blocks, and the expansion adjustment and fixation are achieved through locking parts. Combined with fluorescent agent to illuminate the scale mark under dark light conditions, equipped with pen gauge frame and steel needle support, and the angle ruler can adjust the mounting seat and clamp structure to improve the accuracy and convenience of surveying and mapping.

Benefits of technology

It realizes the high accuracy and stability of the mapping ruler in darker light conditions, improves the effect of night use, and improves the convenience of use and mapping efficiency through multifunctional design.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a surveying and mapping ruler for engineering cost, which comprises a first ruler section, the first ruler section is provided with a mounting groove, a second ruler section is arranged in the mounting groove in a sliding and telescopic manner, the first ruler section and the second ruler section are both provided with marking ends, the outer end parts of the two groups of marking ends are flush, and the inner sides of the marking ends are both provided with fluorescent grooves. A pen compass frame is rotatably installed on the back face of the first ruler section, a clamping frame is arranged at the bottom end of the pen compass frame, a steel needle is arranged at the tail end, away from the second ruler section, of the first ruler section, an installation base is slidably and adjustably installed on the second ruler section, a dial is arranged on the installation base, and an angle ruler is rotatably installed between the dial and the installation base. According to the multifunctional drawing ruler, the accuracy and the stability in the whole surveying and mapping process and the drawing process can be improved, angle measurement, drawing and annular drawing can be flexibly carried out, and the multifunctional drawing ruler is complete in function.
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Description

Technical Field

[0001] The utility model relates to the technical field of surveying rulers, and more particularly to a surveying ruler for engineering cost. Background Art

[0002] A surveying ruler is a tool used for measuring and mapping, and is commonly used in fields such as engineering, architecture, geographic information systems (GIS), and map making. Surveying rulers can come in different types and sizes to suit different measurement needs.

[0003] Existing surveying rulers for engineering cost estimation use a telescopic structure to adjust the length of the ruler. However, the connection between the two segments of the existing telescopic ruler has a position difference, which causes the measuring position of the ruler to change, affecting the stability and accuracy of use.

[0004] Moreover, the scale marks on the existing surveying rulers have poor observation capabilities at night and are not clear, which makes it inconvenient to carry out surveying and mapping operations in dim light conditions.

[0005] In addition, the existing surveying rulers for engineering cost are mainly simple ruler structures with relatively simple functions. They also require carrying different tools such as compasses and angle rulers to use, which makes them less convenient to use.

[0006] Some surveying rulers have an angle scale structure on their upper surface. However, this will create a certain distance between the angle scale and the measurement interface, affecting the accuracy of observation. Utility Model Content

[0007] (1) Technical problems solved

[0008] In response to the problems existing in the prior art, the utility model provides a surveying ruler for engineering cost, so as to solve the technical problems mentioned in the background technology that the surveying ruler for engineering cost in the prior art has poor surveying accuracy and stability, poor effect when used at night, simple structure and poor accuracy in use.

[0009] (2) Technical solution

[0010] To achieve the above objectives, the present invention provides the following technical solutions:

[0011] A surveying ruler for engineering cost estimation comprises a first ruler section, a mounting groove being provided on the first ruler section, a second ruler section being slidably and retractably provided in the mounting groove, marking ends being provided on both the first ruler section and the second ruler section, the outer ends of the two groups of marking ends being flush, fluorescent grooves being provided on the inner sides of the marking ends, the fluorescent grooves being filled with a fluorescent agent, wherein the portion where the marking end is connected to the fluorescent groove is made of a transparent material such as resin, and has marking scales thereon, a pen gauge holder being rotatably mounted on the back side of the first ruler section, a snap-fitting frame being provided at the bottom end of the pen gauge holder, a steel needle being provided at the tail end of the first ruler section away from the second ruler section, a mounting seat being slidably and adjustably mounted on the second ruler section, a graduated dial being provided on the mounting seat, an angle ruler being rotatably mounted between the graduated dial and the mounting seat, a clamping sleeve being provided on the sliding sleeve of the angle ruler, and an alignment member being provided at the bottom end of the clamping sleeve.

[0012] The utility model is further configured as follows: a mounting bracket is provided on the back of the first scale segment, a mounting shaft is provided on the mounting bracket, the top end of the pen gauge frame is rotatably sleeved on the mounting shaft through a damping gasket, a first locking piece is threadedly provided on the mounting bracket, the inner end portion of the first locking piece is abutted against the top end of the pen gauge frame, thereby realizing a rotatable and adjustable installation of the pen gauge frame on the back of the first scale segment.

[0013] The utility model is further configured as follows: the pen gauge holder includes a fixed frame, a telescopic frame is provided on the sliding sleeve at the bottom end of the fixed frame, a second locking piece is threadedly provided on the telescopic frame, and the inner end portion of the second locking piece is abutted against the fixed frame to realize telescopic adjustment of the pen gauge holder and improve convenience of use.

[0014] The present invention is further configured such that the inner top and the inner side of the installation groove are both provided with limit blocks, and the top and the side of the second scale segment are matched with limit slots, and the limit blocks are matched with the corresponding limit slots in a limited sliding manner to realize the sliding and adjustable installation of the second scale segment on the first scale segment.

[0015] The present invention is further configured such that a third locking piece is threadedly provided on the first length segment, and the bottom end of the third locking piece abuts against the top end of the second length segment to achieve locking and fixing of the second length segment on the first length segment.

[0016] The utility model is further configured such that a connecting shaft is provided between the scale plate and the mounting seat, the angle ruler is rotatably sleeved on the connecting shaft through a damping gasket, a fourth locking piece is threadedly provided on the scale plate, and the bottom end of the fourth locking piece is abutted against the angle ruler to achieve stable installation of the angle ruler on the mounting seat.

[0017] The utility model is further configured such that a movable slider is provided at the bottom end of the mounting seat in cooperation with the limiting groove, the movable slider and the limiting groove are limitedly slidably engaged with each other, a fifth locking piece is threadedly provided on the scale plate, the bottom end of the fifth locking piece extends to the bottom end of the movable slider and abuts against the inner wall of the limiting groove at the top, thereby realizing a sliding and adjustable installation of the mounting seat on the second scale segment.

[0018] The utility model is further configured such that the outer threaded sleeve of the steel needle is provided with a protective sleeve to improve the protection of the steel needle when not in use.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, this utility model provides a surveying ruler for engineering cost, which has the following features:

[0021] Beneficial effects:

[0022] 1. In the present invention, the second scale segment is slidably mounted on the first scale segment through the cooperation of the mounting groove, the limit block and the limit groove, and a third locking piece is provided in cooperation. By screwing the third locking piece, the second scale segment can be telescopically adjusted and locked on the first scale segment, thereby realizing flexible adjustment of the length of the surveying ruler when in use; and the present invention makes the outer ends of the marking ends on the first scale segment and the second scale segment level, so that it is convenient to keep the drawing interface level when drawing with the surveying ruler, thereby ensuring the accuracy and drawing stability during the surveying process; at the same time, by providing the fluorescent agent, fluorescence can be emitted in dim light to illuminate the scale mark on the marking end, thereby improving the use effect of the surveying ruler in dim light conditions such as at night.

[0023] 2. The utility model is provided with a pen gauge holder rotatably mounted on the back side of the first ruler section, and a snap-fitting frame is provided at the bottom end of the pen gauge holder, which is used to snap-fit and fix the drawing pen, which can be a pencil, a cylindrical pen or other types of drawing pens. A steel needle is provided at the tail end of the first ruler section away from the second ruler section. When in use, the surveying ruler is placed vertically as a whole and supported and positioned by the steel needle. Then, the pen gauge holder is unfolded to a suitable position relative to the first ruler section, and the first locking piece is tightened to lock and fix the pen gauge holder on the mounting frame, so that after the pen gauge holder drives the drawing pen to move to a suitable position, the circle drawing operation can be performed by surveying and mapping. Here, by adjusting the second locking piece, the telescopic frame can be telescoped and locked on the fixed frame, thereby realizing the flexible adjustment of the use position and length of the drawing pen when in use, thereby improving the convenience of the surveying ruler in engineering cost measurement and drawing.

[0024] The first locking member is engaged with the first locking member and the second locking member is engaged with the first locking member, thereby locking the first locking member and the second locking member together so as to fix the first locking member on the second segment and thus fix the second segment in the working position of the angle ruler. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a surveying ruler for engineering cost in this utility model. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the overall structure of a surveying ruler for engineering cost in this utility model. Figure 2 ;

[0027] Figure 3 This is a schematic cross-sectional view of the structure of the first scale section in the present utility model;

[0028] Figure 4 This is a cross-sectional view of the connection structure between the angle ruler and the mounting base in the present invention;

[0029] Figure 5 This is a schematic diagram of the connection structure between the alignment member and the angle ruler in the present invention;

[0030] Figure 6 For this utility model Figure 3 A magnified view of the local structure of the middle A.

[0031] In the figure: 1. First ruler section; 2. Mounting slot; 3. Second ruler section; 4. Marking end; 5. Fluorescent slot; 6. Fluorescent agent; 7. Pen gauge holder; 8. Clamping frame; 9. Steel needle; 10. Mounting seat; 11. Dial; 12. Angle ruler; 13. Clamping sleeve; 14. Alignment piece; 15. Mounting frame; 16. Mounting shaft; 17. First locking piece; 18. Fixed frame; 19. Telescopic frame; 20. Second locking piece; 21. Limit block; 22. Limiting slot; 23. Third locking piece; 24. Connecting shaft; 25. Fourth locking piece; 26. Moving slider; 27. Fifth locking piece; 28. Protective cover. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually relative to the directions shown in the drawings, or relative to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually relative to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned direction words are not used to limit the present invention.

[0035] See also Figures 1-6 , a surveying ruler for engineering cost, including a first scale segment 1, a mounting groove 2 is provided on the first scale segment 1, a second scale segment 3 is slidably and retractably provided in the mounting groove 2, a marking end 4 is provided on the first scale segment 1 and the second scale segment 3, the outer ends of the two groups of marking ends 4 are flat, and a fluorescent groove 5 is provided on the inner side of the marking end 4, and the fluorescent groove 5 is filled with a fluorescent agent 6, wherein the inner top and inner side ends of the mounting groove 2 are provided with a limiting block 21, the top and side ends of the second scale segment 3 are matched with limiting grooves 22, and the limiting block 21 and the corresponding limiting groove 22 are limitedly slidably matched, a third locking piece 23 is threadedly provided on the first scale segment 1, and the bottom end of the third locking piece 23 is against the top of the second scale segment 3. In the utility model, through the mounting groove 2 and the limiting The block 21 and the limiting groove 22 cooperate to slide the second scale segment 3 onto the first scale segment 1, and a third locking piece 23 is provided in cooperation. By screwing the third locking piece 23, the second scale segment 3 can be telescopically adjusted and locked on the first scale segment 1, thereby realizing flexible adjustment of the length of the surveying ruler when in use; and the utility model makes the outer ends of the marking ends 4 on the first scale segment 1 and the second scale segment 3 level, so that it is convenient to keep the drawing interface level when drawing with the surveying ruler, thereby ensuring the accuracy and stability of the surveying process; at the same time, by providing the fluorescent agent 6, fluorescence can be emitted in dim light to illuminate the scale mark of the marking end 4, thereby improving the use effect of the surveying ruler in dim light conditions such as at night;

[0036] A pen gauge frame 7 is rotatably mounted on the back of the first scale segment 1, and a snap-fit frame 8 is provided at the bottom end of the pen gauge frame 7. A steel needle 9 is provided at the tail end of the first scale segment 1 away from the second scale segment 3. A mounting frame 15 is provided on the back of the first scale segment 1, and a mounting shaft 16 is provided on the mounting frame 15. The top of the pen gauge frame 7 is rotatably sleeved on the mounting shaft 16 through a damping gasket. A first locking member 17 is threadedly provided on the mounting frame 15, and the inner end of the first locking member 17 is against the top of the pen gauge frame 7. The pen gauge frame 7 includes a fixed frame 18, and a telescopic frame 19 is slidably sleeved on the bottom end of the fixed frame 18. A second locking member 20 is threadedly provided on the telescopic frame 19, and the inner end of the second locking member 20 is against the fixed frame 18. The utility model has a pen gauge frame 7 rotatably mounted on the back of the first scale segment 1, and a snap-fit frame 8 is provided at the bottom end of the pen gauge frame 7. The clamping frame 8 is used to clamp and fix the drawing pen, which can be a variety of drawing pens such as pencils and cylindrical pens. A steel needle 9 is provided at the tail end of the first scale segment 1 away from the second scale segment 3. When in use, the surveying ruler is placed vertically as a whole and supported and positioned by the steel needle 9. Then, the pen gauge frame 7 is unfolded to a suitable position relative to the first scale segment 1, and the first locking member 17 is tightened to achieve the locking and fixation of the pen gauge frame 7 on the mounting frame 15. After the pen gauge frame 7 drives the drawing pen to move to a suitable position, the circle drawing operation can be performed by surveying. Here, by adjusting the second locking member 20, the telescopic frame 19 can be telescoped and locked on the fixing frame 18, so that the use position and length of the drawing pen can be flexibly adjusted when in use, thereby improving the convenience of the surveying ruler when performing engineering cost measurement and drawing.

[0037] The second scale section 3 is provided with a mounting seat 10 which is slidably adjustable. The mounting seat 10 is provided with a dial 11. An angle ruler 12 is rotatably mounted between the dial 11 and the mounting seat 10. A clamping sleeve 13 is provided on the sliding sleeve of the angle ruler 12. An alignment member 14 is provided at the bottom end of the clamping sleeve 13. A connecting shaft 24 is provided between the dial 11 and the mounting seat 10. The angle ruler 12 is rotatably sleeved on the connecting shaft 24 through a damping gasket. A fourth locking member 25 is threadedly provided on the dial 11. The bottom end of the fourth locking member 25 is provided with a clamping sleeve 13. The bottom end of the mounting base 10 is matched with the limiting groove 22 to provide a movable slider 26, and the movable slider 26 and the limiting groove 22 are limited and slidably matched. A fifth locking member 27 is threadedly provided on the dial 11, and the bottom end of the fifth locking member 27 extends to the bottom end of the movable slider 26 and is against the inner wall of the top limiting groove 22; the utility model can control the movement of the mounting base 10 on the first scale section 1 by sliding the movable slider 26 and the limiting groove 22, thereby connecting the shaft 24. The angle ruler 12 is driven to move and the use position of the angle ruler 12 on the second scale section 3 is flexibly adjusted. After adjusting to the appropriate position, the fifth locking piece 27 is tightened so that the bottom end of the fifth locking piece 27 abuts against the inner wall of the limit groove 22, thereby realizing the locking and fixing of the mounting base 10 on the second scale section 3, thereby realizing the fixation of the use position of the angle ruler 12. Thereafter, the angle ruler 12 is rotated on the connecting shaft 24, and the position of the rotation angle is judged by the dial 11. After adjusting to the appropriate angle, the fourth locking piece 25 is tightened so that the bottom of the fourth locking piece 25 presses and fixes the angle ruler 12, thereby realizing the fixation of the angle ruler 12 during angle drawing; when measuring the angle, the front end of the alignment piece 14 is in contact with the line to be measured. Here, the front end of the alignment piece 14 is flush with the front end of the angle ruler 12, so that the data in the process of engineering cost surveying and mapping can be accurately measured. Here, a pointer structure can be set on the angle ruler 12 in conjunction with the dial 11, which is more convenient for observation during angle adjustment.

[0038] See also Figures 1-6 As an implementation method of the steel needle 9: the outer threaded sleeve of the steel needle 9 is provided with a protective sleeve 28.

[0039] Specifically, when not in use, the protective sleeve 28 can be placed on the outside of the steel needle 9 to protect the steel needle 9, avoid accidental punctures, and improve the overall protection during use.

[0040] In summary, when the overall equipment is in use:

[0041] In the present invention, the second scale segment 3 is slidably mounted on the first scale segment 1 by cooperating with the mounting groove 2, the limiting block 21, and the limiting groove 22, and a third locking member 23 is provided in conjunction with the same. By screwing the third locking member 23, the second scale segment 3 can be telescopically adjusted and locked on the first scale segment 1, thereby realizing flexible adjustment of the length of the surveying ruler when in use.

[0042] Moreover, the outer ends of the marking ends 4 on the first scale segment 1 and the second scale segment 3 are level, so that when drawing with the surveying ruler, the drawing interface is kept level, thereby ensuring the accuracy and stability of the surveying process;

[0043] At the same time, the fluorescent agent 6 can emit fluorescence in dim light conditions to illuminate the scale mark of the marking end 4, thereby improving the use effect of the surveying ruler in dim light conditions such as at night;

[0044] The utility model has a pen gauge holder 7 rotatably mounted on the back of the first scale segment 1, and a snap-fitting frame 8 is provided at the bottom end of the pen gauge holder 7. The snap-fitting frame 8 is used to snap-fit and fix a drawing pen, which can be a pencil, a cylindrical pen, or other types of drawing pens. A steel needle 9 is provided at the tail end of the first scale segment 1 away from the second scale segment 3. When in use, the surveying ruler is placed vertically as a whole and supported and positioned by the steel needle 9. Then, the pen gauge holder 7 is unfolded to a suitable position relative to the first scale segment 1, and the first locking member 17 is tightened to achieve locking and fixing of the pen gauge holder 7 on the mounting frame 15. After the pen gauge holder 7 drives the drawing pen to move to a suitable position, a circle drawing operation can be performed by surveying and mapping.

[0045] Here, by adjusting the second locking member 20, the telescopic frame 19 can be adjusted and locked on the fixed frame 18, so that the position and length of the drawing pen can be flexibly adjusted when in use, thereby improving the convenience of using the surveying ruler in engineering cost measurement and drawing.

[0046] The utility model can control the movement of the mounting base 10 on the first scale segment 1 by slidingly cooperating between the movable slider 26 and the limiting groove 22, thereby driving the angle ruler 12 to move through the connecting shaft 24, and flexibly adjusting the use position of the angle ruler 12 on the second scale segment 3. After adjusting to the appropriate position, the fifth locking member 27 is tightened so that the bottom end of the fifth locking member 27 abuts against the inner wall of the limiting groove 22, thereby achieving the locking and fixing of the mounting base 10 on the second scale segment 3, thereby achieving the fixed use position of the angle ruler 12;

[0047] After that, the angle of the angle ruler 12 on the connecting shaft 24 is rotated, and the position of the rotation angle is determined by the dial 11. After adjusting to the appropriate angle, the fourth locking member 25 is tightened so that the bottom of the fourth locking member 25 presses and fixes the angle ruler 12, thereby fixing the angle ruler 12 when drawing at an angle;

[0048] When measuring the angle, the front end of the alignment member 14 is aligned with the line to be measured. Here, the front end of the alignment member 14 is flush with the front end of the angle ruler 12, so that the data in the process of engineering cost surveying and mapping can be accurately measured. Here, a pointer structure can be set on the angle ruler 12 to cooperate with the dial 11 to facilitate observation during angle adjustment.

[0049] In the present invention, the position of the alignment member 14 on the angle ruler 12 can be flexibly adjusted by disposing the clamping sleeve 13, thereby improving the overall flexibility during use.

[0050] In all the solutions mentioned above, the connection between two components can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which are not listed here one by one. In the above, whenever there is a fixed connection, welding is preferably considered. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0051] In all the solutions mentioned above, if there is no clear description about the operation of electrical components, they are all controlled by the controller. Since the devices matched with the controller are common devices, their control principles and circuit connections are well-known and mature technologies. Therefore, their electrical connection relationships and specific circuit structures will not be described in detail here.

[0052] In all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are well-known technologies and will not be described in detail in this utility model.

[0053] In all the solutions mentioned above, those involving the connection between solar panels and batteries can be used in conjunction with essential accessories such as inverters, battery charging controllers, cables, fuses, and brackets. Their control principles and line connections are all well-known and mature technologies. Their electrical connection relationships and specific circuit structures will not be described in detail here.

Claims

1. A surveying ruler for engineering cost, comprising a first ruler section (1), characterized by: The first scale segment (1) is provided with a mounting groove (2), and a second scale segment (3) is slidably and telescopically provided in the mounting groove (2). The first scale segment (1) and the second scale segment (3) are both provided with marking ends (4), and the outer ends of the two groups of marking ends (4) are flat. The inner sides of the marking ends (4) are provided with fluorescent grooves (5), and the fluorescent grooves (5) are filled with fluorescent agent (6). A pen gauge holder (7) is rotatably installed on the back of the first scale segment (1), and the pen gauge holder (7) The bottom end of the first scale segment (1) is provided with a snap-fit frame (8), the tail end of the first scale segment (1) away from the second scale segment (3) is provided with a steel needle (9), the second scale segment (3) is slidably and adjustably provided with a mounting seat (10), the mounting seat (10) is provided with a dial (11), an angle ruler (12) is rotatably installed between the dial (11) and the mounting seat (10), a sliding sleeve (13) is provided on the angle ruler (12), and the bottom end of the sleeve (13) is provided with an alignment member (14).

2. The engineering cost surveying ruler according to claim 1, characterized in that: A mounting frame (15) is provided on the back of the first ruler section (1), and a mounting shaft (16) is provided on the mounting frame (15). The top end of the pen gauge frame (7) is rotatably sleeved on the mounting shaft (16) through a damping washer. A first locking member (17) is threadedly provided on the mounting frame (15), and the inner end of the first locking member (17) abuts against the top end of the pen gauge frame (7).

3. The engineering cost surveying ruler according to claim 2, characterized in that: The pen gauge frame (7) comprises a fixed frame (18), a telescopic frame (19) is provided on the bottom sliding sleeve of the fixed frame (18), a second locking member (20) is provided on the telescopic frame (19) in a threaded manner, and the inner end of the second locking member (20) abuts against the fixed frame (18).

4. A surveying ruler for construction cost according to any one of claims 1 to 3, characterized in that: The inner top and inner side of the installation groove (2) are both provided with a limiting block (21), and the top and side of the second scale segment (3) are matched with a limiting groove (22), and the limiting block (21) and the corresponding limiting groove (22) are matched in a limited sliding manner.

5. The engineering cost surveying ruler according to claim 4, characterized in that: A third locking member (23) is threadedly provided on the first length segment (1), and the bottom end of the third locking member (23) abuts against the top end of the second length segment (3).

6. The engineering cost surveying ruler according to claim 4, characterized in that: A connecting shaft (24) is provided between the scale plate (11) and the mounting seat (10); the angle ruler (12) is rotatably sleeved on the connecting shaft (24) via a damping washer; a fourth locking member (25) is threadedly provided on the scale plate (11); and the bottom end of the fourth locking member (25) abuts against the angle ruler (12).

7. The engineering cost surveying ruler according to claim 6, characterized in that: The bottom end of the mounting seat (10) is matched with the limiting groove (22) to be provided with a movable slider (26), and the movable slider (26) and the limiting groove (22) are limitedly slidably matched, and a fifth locking member (27) is threadedly provided on the scale plate (11), and the bottom end of the fifth locking member (27) extends to the bottom end of the movable slider (26) and abuts against the inner wall of the limiting groove (22) at the top.

8. The engineering cost surveying ruler according to claim 1, characterized in that: The outer threaded sleeve of the steel needle (9) is provided with a protective sleeve (28).