Prefabricated stair construction measuring device

Abstract

The invention discloses a prefabricated stair construction measuring device, and relates to the technical field of construction measurement, the prefabricated stair construction measuring device comprises a stand column, the outer wall of the stand column is sleeved with a folding tripod, an insertion rod is inserted in the upper side of the stand column, the upper side of the insertion rod is rotatably connected with a deflection pile, and the outer wall of the deflection pile is fixedly connected with a handle. By arranging a first driving motor, a rotating disc and a laser interference module in the correction mechanism, the laser interference module can conduct automatic deflection scanning within the range of positive and negative ten degrees around the deflection pile, interference signal analysis is matched, the deflection angle between laser rays and the wall surface can be accurately obtained, and the correction accuracy is improved. The embedded bolt eccentric error detection device has the advantages of being high in practicability and capable of meeting the requirement for high-quality construction of modern fabricated buildings.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction surveying, in particular to a prefabricated assembly type stair construction surveying device. BACKGROUND

[0002] In building engineering, prefabricated assembly type stairs are being widely promoted and applied due to their high construction efficiency, high standardization of structure, and less on-site wet work. However, in the installation process of prefabricated stairs, the position accuracy of the embedded bolts at the upper and lower openings of the stair section directly affects the installation alignment accuracy and structural stability of the stairs. Since prefabricated stairs are usually installed in the stairwell near the wall, the space is narrow, and the traditional manual measurement method has problems such as difficult operation, low efficiency, and large error when positioning the upper and lower embedded bolts, which is difficult to meet the high-precision construction requirements.

[0003] The existing patent CN113029100B discloses a building construction multi-point real-time data measurement device and a summary method. This device solves the problem that the existing building construction data collection can only be measured in a single direction and a single angle, and the construction ground can only be measured horizontally with similar ground, and cannot standardize the size and flatness of the wall, thereby causing the problem that size deviation and flatness cannot be found in time during multi-direction construction.

[0004] However, in the existing prefabricated building construction background, the installation beam width of the building stairwell is small, and this device lacks a systematic solution for multi-point collaborative ranging, automatic angle correction, and data synchronous display in the narrow installation environment of prefabricated stairs. In particular, it is inconvenient to calculate the straight-line distance and deflection angle between the upper and lower bolts, which can easily lead to measurement errors and repeated work, affecting the construction quality.

[0005] Therefore, there is an urgent need to provide a prefabricated assembly type stair construction surveying device that is compact in structure, high in measurement accuracy, convenient to operate, and suitable for complex construction environment in the stairwell, to realize efficient and accurate measurement of the position relationship of the upper and lower bolt, and meet the urgent needs of high-quality construction of modern prefabricated buildings. SUMMARY

[0006] The present application aims to provide a prefabricated assembly type stair construction surveying device to solve the problems raised in the background.

[0007] In order to solve the above technical problems, the present application provides the following technical solutions: a prefabricated assembly type stair construction measuring device, comprising a stand, a folding tripod is sleeved on the outer wall of the stand, a plug rod is inserted on the upper side of the stand, a deflection pile is rotationally connected on the upper side of the plug rod, a handle is fixedly connected on the outer wall of the deflection pile, a fixing disc is fixedly connected on the upper side of the deflection pile, a first laser ranging module is fixedly connected on the upper side of the fixing disc, a measuring mechanism is arranged on the lower side of the stand, a deflection mechanism is arranged on the outer side of the upper side of the stand, a correction mechanism is arranged on the outer wall of the deflection pile, and a control display module is further fixedly connected on the outer wall of the deflection pile.

[0008] The measuring mechanism is used for detecting the distance of the pre-buried bolt at the upper and lower ladder beam of the ladder section.

[0009] The deflection mechanism can adjust the angle of the plug rod relative to the stand.

[0010] According to the above technical solutions, the measuring mechanism comprises a first horizontal detection module, the first horizontal detection module is located in the middle of the side wall of the stand, and the side wall of the first horizontal detection module is fixedly connected with the side wall of the stand, the measuring mechanism further comprises a fixing rod, the fixing rod is located on the lower side of the stand, the upper side outer wall of the fixing rod is fixedly connected with the lower end inner wall of the stand, an angle encoder is fixedly connected on the lower end side wall of the fixing rod, a hinged arm is fixedly connected on the input end of the angle encoder, a fixing sleeve is rotationally connected on the lower end of the hinged arm through a bearing, a counterweight is fixedly connected on the lower side of the fixing sleeve, a second laser ranging module is fixedly connected on the middle inner wall of the fixing sleeve, a second horizontal detection module is fixedly connected on the outer wall of the deflection pile, and a third laser ranging module is fixedly connected on the upper side of the fixing rod.

[0011] According to the above technical solutions, the first horizontal detection module, the second laser ranging module, the second horizontal detection module, the third laser ranging module and the angle encoder are electrically connected with the control display module, the first laser ranging module is electrically connected with the control display module, and the mass of the counterweight is greater than that of the second laser ranging module.

[0012] According to the above technical solutions, the correction mechanism comprises a first drive motor, the outer wall of the first drive motor is fixedly connected with the side wall of the deflection pile, a transmission wheel is fixedly connected on the output end of the first drive motor, a rotating disc is rotationally connected on the lower surface of the fixing disc through a bearing, a transmission plate is fixedly connected on the outer wall of the rotating disc on the side close to the first drive motor, the outer wall of the transmission plate is in contact with the outer wall of the transmission wheel, and a laser interference module is fixedly connected on the side of the rotating disc away from the first drive motor.

[0013] According to the technical scheme, the first driving motor can drive the rotating disc to rotate through the transmission wheel, and the laser interference module and the first driving motor are electrically connected with the control display module, and the detection end of the laser interference module is vertically arranged with the detection end of the first laser distance measuring module.

[0014] According to the technical scheme, the deflection mechanism comprises a fixed frame, the outer wall of the stand is fixedly connected with the fixed frame, the inner wall of the fixed frame is fixedly connected with the second driving motor, the output end of the second driving motor is fixedly connected with the gear, the upper end of the stand is rotatably connected with the transmission sleeve through a bearing, the inner wall of the transmission sleeve is in contact with the outer wall of the insertion rod, and the outer wall of the transmission sleeve is in mesh with the outer wall of the gear.

[0015] According to the technical scheme, the lower end of the insertion rod is in a cylindrical structure, the middle part of the insertion rod is in a hexagonal prism structure, and the outer wall of the lower end of the insertion rod is in contact with the inner wall of the stand.

[0016] According to the technical scheme, the second driving motor is electrically connected with the control display module, and the control display module can drive the gear and the transmission sleeve to rotate through the second driving motor, so that the insertion rod and the stand are relatively deflected.

[0017] Compared with the prior art, the present application has the following advantages: the folding tripod and the insertion rod are arranged, the measuring device can be quickly unfolded and the height can be adjusted, the deflection pile, the fixed disc and the first laser distance measuring module are arranged, the distance measuring direction can be manually adjusted according to the actual construction environment, the accurate measurement of the distance in the platform surface can be completed, the adaptability and the measurement accuracy of the device are improved, the control display module is arranged, the real-time acquisition and display of the measurement data can be realized, and the data reading efficiency is improved.

[0018] The measuring mechanism is arranged, the distance between the second laser distance measuring module and the upper layer of the embedded bolt, the length of the preset articulated arm, the deflection angle of the articulated arm relative to the stand, the total length from the lower end of the fixed rod to the upper side of the insertion rod, the distance from the lower side of the preset deflection pile to the detection end of the first laser distance measuring module, the deflection angle of the deflection pile relative to the stand and the distance between the first laser distance measuring module and the lower layer of the embedded bolt can be measured by the control display module, and the straight-line distance between the upper layer of the bolt and the lower layer of the bolt can be calculated by the trigonometric function and displayed.

[0019] The first driving motor, the rotating disc and the laser interference module in the correction mechanism are arranged, the laser interference module can be automatically deflected and scanned within a range of plus or minus ten degrees around the deflection pile, the deflection angle of the laser line relative to the wall surface can be accurately obtained through cooperation with the interference signal analysis, the eccentricity error of the lower layer of the embedded bolt in the vertical direction can be obtained, the angle correction of the upper and lower embedded bolts by the construction personnel is assisted, and the overall construction perpendicularity and consistency are improved.

[0020] By setting the second driving motor, gear and transmission sleeve in the deflection mechanism, the insertion rod can be driven to deflect relative to the column to realize automatic deflection adjustment, so that the first laser ranging module can complete automatic alignment according to the deflection angle provided by the laser interference module, and reset self-checking is performed in cooperation with the control display module, so that whether the driving mechanism has an error can be effectively judged, automatic detection and correction of system error are realized, and the stability and reliability of long-term work of the device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0023] Figure 2 is a schematic diagram of the structure of the present application;

[0024] Figure 3 is a schematic diagram of the structure of the present application;

[0025] Figure 4 is a schematic diagram of the structure of the present application;

[0026] Figure 5 is a schematic diagram of the structure of the present application;

[0027] Figure 6 is a schematic diagram of the structure of the present application;

[0028] In the drawings: 1, column; 2, folding tripod; 3, insertion rod; 4, deflection pile; 5, handle; 6, fixed disc; 7, first laser ranging module; 8, calculation mechanism; 9, correction mechanism; 10, deflection mechanism; 11, control display module; 801, first horizontal detection module; 802, fixed rod; 803, angle encoder; 804, articulated arm; 805, fixed sleeve; 806, counterweight; 807, second laser ranging module; 808, second horizontal detection module; 809, third laser ranging module; 901, first driving motor; 902, transmission wheel; 903, turntable; 904, transmission plate; 905, laser interference module; 101, fixed frame; 102, second driving motor; 103, gear; 104, transmission sleeve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Embodiment one:

[0031] Please refer to Figures 1-2 , the application provides technical scheme: a prefabricated assembly type stair construction measuring device, including stand 1, the outer wall of stand 1 is provided with folding tripod 2, the upper side of stand 1 is inserted with inserting rod 3, the upper side of inserting rod 3 is rotatably connected with deflection pile 4, the outer wall of deflection pile 4 is fixedly connected with handle 5, the upper side of deflection pile 4 is fixedly connected with fixed disc 6, the upper side of fixed disc 6 is fixedly connected with first laser ranging module 7, the lower side of stand 1 is provided with measuring mechanism 8, the upper side of stand 1 is provided with deflection mechanism 10 outside, the outer wall of deflection pile 4 is provided with correction mechanism 9, the outer wall of deflection pile 4 is also fixedly connected with control display module 11;

[0032] In the actual application process of the device, the folding tripod 2 is unfolded to stably support the stand 1 and the structures such as folding tripod 2, inserting rod 3 and deflection pile 4 on the upper side of the stand 1, so that the lower end of the stand 1 faces the measuring starting point, and personnel can hold the handle 5 to adjust the inclination angle of the deflection pile 4, thereby adjusting the detection point of the first laser ranging module 7, the first laser ranging module 7 accurately measures the distance of the target by using laser, thereby achieving the measurement of the in-plane distance such as the length and width of the stair platform.

[0033] Embodiment two:

[0034] Please refer to Figures 1-4 On the basis of embodiment one, the application provides technical scheme: measuring mechanism 8 includes first horizontal detection module 801, first horizontal detection module 801 is located in the middle of the side wall of stand 1, and the side wall of first horizontal detection module 801 is fixedly connected with the side wall of stand 1, measuring mechanism 8 further includes fixed rod 802, fixed rod 802 is located on the lower side of stand 1, the upper side outer wall of fixed rod 802 is fixedly connected with the inner wall of the lower end of stand 1, the lower end side wall of fixed rod 802 is fixedly connected with angle encoder 803, the input end of angle encoder 803 is fixedly connected with articulated arm 804, the lower end of articulated arm 804 is rotatably connected with fixed sleeve 805 through bearing, the lower side of fixed sleeve 805 is fixedly connected with counterweight 806, the middle inner wall of fixed sleeve 805 is fixedly connected with second laser ranging module 807, the outer wall of deflection pile 4 is fixedly connected with second horizontal detection module 808 on the lower side, the upper side of fixed rod 802 is fixedly connected with third laser ranging module 809, first horizontal detection module 801, second laser ranging module 807, second horizontal detection module 808, third laser ranging module 809 and angle encoder 803 are electrically connected with control display module 11, and first laser ranging module 7 is electrically connected with control display module 11, the mass of counterweight 806 is greater than that of second laser ranging module 807, and measuring mechanism 8 is used for distance detection of pre-buried bolts at the upper and lower ladder beams of ladder section.

[0035] In the process of measuring the distance of the embedded bolt on the upper and lower ladder beams, the angle encoder 803 is used to detect the deflection angle of the articulated arm 804 relative to the stand 1, the second laser distance measuring module 807 is used to measure the distance from the lower side to the upper surface of the embedded bolt, and the third laser distance measuring module 809 is used to measure the distance from the upper part to the lower end of the insertion rod 3, and the first horizontal detection module 801 is used to measure whether the stand 1 is vertical, the first laser distance measuring module 7 is used to measure the distance from the embedded bolt at the other ladder beam of the staircase, and the second horizontal detection module 808 is used to detect the inclination angle of the deflection post 4.

[0036] In application, since the embedded bolt of the staircase is close to the staircase well position, it is not convenient to unfold the folding tripod 2, so the device can be erected on the position far from the embedded bolt on the upper side of the staircase well, so that the folding tripod 2 has sufficient unfolding space, and the stand 1 is perpendicular to the ground, and the first laser distance measuring module 7 is directed to the embedded bolt position of the next floor, then the second laser distance measuring module 807 is deflected to the upper side of the embedded bolt on the upper floor by rotating the articulated arm 804, the first laser distance measuring module 7 is directed to the embedded bolt position of the next floor, at this time, the second laser distance measuring module 807 measures the distance from the lower side to the embedded bolt, the third laser distance measuring module 809 measures the distance from the lower end of the insertion rod 3 to the embedded bolt, and the difference between the preset length of the insertion rod 3 and the distance is the distance of the insertion rod 3 extending to the outside of the folding tripod 2, this distance and the sum of the preset length of the stand 1 and the distance between the upper side of the third laser distance measuring module 809 and the lower end of the first horizontal detection module 801 are the distance from the lower end of the fixed rod 802 to the upper end of the insertion rod 3, the lengths of the deflection post 4, the fixed disc 6 and the first laser distance measuring module 7 are preset values, the second horizontal detection module 808 detects the deflection angle of the deflection post 4, and the control display module 11 calculates the straight line distance between the embedded bolts on the upper and lower floors by the distance from the second laser distance measuring module 807 to the embedded bolt on the upper floor, the length of the articulated arm 804, the deflection angle of the articulated arm 804 relative to the stand 1, the total length from the lower end of the fixed rod 802 to the upper side of the insertion rod 3, the distance from the lower side of the deflection post 4 to the detection end of the first laser distance measuring module 7, the deflection angle of the deflection post 4 relative to the stand 1, and the distance between the first laser distance measuring module 7 and the embedded bolt on the lower floor, and displays the distance, thereby facilitating the adjustment of the hole drilling before the construction of the prefabricated staircase.

[0037] Example Three:

[0038] Please refer to Figures 1-4On the basis of embodiment one and embodiment two, the application provides a technical scheme: the correction mechanism 9 comprises a first driving motor 901, the outer wall of the first driving motor 901 is fixedly connected with the side wall of the deflection pile 4, the output end of the first driving motor 901 is fixedly connected with a transmission wheel 902, the lower surface of the fixed disc 6 is rotatably connected with a rotating disc 903 through a bearing, the outer wall of the rotating disc 903 is fixedly connected with a transmission plate 904 on the side close to the first driving motor 901, the outer wall of the transmission plate 904 is in contact with the outer wall of the transmission wheel 902, the side of the rotating disc 903 away from the first driving motor 901 is fixedly connected with a laser interference module 905, the first driving motor 901 can drive the rotating disc 903 to rotate through the transmission wheel 902, and the laser interference module 905 and the first driving motor 901 are electrically connected with the control display module 11, and the detection end of the laser interference module 905 is vertically arranged with the detection end of the first laser ranging module 7.

[0039] After the distance between the upper and lower embedded bolts is measured by the device, the control display module 11 drives the first driving motor 901 to drive the transmission wheel 902 to reciprocate and deflect, so that the transmission wheel 902 drives the transmission plate 904, the rotating disc 903 and the laser interference module 905 to deflect in the range of plus or minus ten degrees, and the deflection angle of the laser interference module 905 relative to the deflection pile 4 is measured at the position where the laser interference module 905 is perpendicular to the wall surface, so that the angle deviation between the upper and lower embedded bolts can be determined through the angle, and the distance between the upper and lower embedded bolts and the wall surface is avoided to be inconsistent.

[0040] Embodiment four:

[0041] Please refer to Figures 1-6 On the basis of embodiment one, embodiment two and embodiment three, the application provides a technical scheme: the deflection mechanism 10 comprises a fixed frame 101, the outer wall of the upright column 1 is fixedly connected with the fixed frame 101 on the upper side, the inner wall of the fixed frame 101 is fixedly connected with a second driving motor 102, the output end of the second driving motor 102 is fixedly connected with a gear 103, the upper end of the upright column 1 is rotatably connected with a transmission sleeve 104 through a bearing, the inner wall of the transmission sleeve 104 is in contact with the outer wall of the insertion rod 3, the outer wall of the transmission sleeve 104 is engaged with the outer wall of the gear 103, the lower end of the insertion rod 3 is in a cylindrical structure, the middle part of the insertion rod 3 is in a hexagonal prism structure, the lower end outer wall of the insertion rod 3 is in contact with the inner wall of the upright column 1, the second driving motor 102 is electrically connected with the control display module 11, and the control display module 11 can drive the gear 103 and the transmission sleeve 104 to rotate through the second driving motor 102, so that the insertion rod 3 and the upright column 1 are relatively deflected, and the deflection mechanism 10 can adjust the angle of the insertion rod 3 relative to the upright column 1.

[0042] After the relative deflection angle of the rotating disc 903 and the deflection post 4 is measured by the laser interference module 905 when the laser interference module 905 is perpendicular to the wall, the second driving motor 102 is started by the control display module 11 to drive the gear 103 to rotate, and then the gear 103 drives the transmission sleeve 104 and the insertion rod 3 to deflect, so that the first laser ranging module 7 deflects in the same direction and at the same angle according to the deflection angle and direction of the laser interference module 905, and then the indicating light of the first laser ranging module 7 can irradiate the position that should be embedded under the condition of no error of the lower embedded bolt, and at the same time, the laser interference module 905 is reset relative to the fixed disc 6 by starting the first driving motor 901 by the control display module 11, and whether the laser interference module 905 is perpendicular to the wall is detected, since the laser interference module 905 is deflected by the fixed disc 6 after being deflected by itself, the laser interference module 905 should be perpendicular to the wall after being reset, and at this time, whether the driving of the first driving motor 901 and the second driving motor 102 is error can be judged by the perpendicular relationship between the laser interference module 905 and the wall, so as to complete self-checking and avoid the situation of sensor drift.

[0043] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0044] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A prefabricated stair construction measuring device comprising a stand (1), characterized in that: The outer wall of the stand (1) is sleeved with a folding tripod (2), the upper side of the stand (1) is inserted with an insertion rod (3), the upper side of the insertion rod (3) is rotationally connected with a deflection pile (4), the outer wall of the deflection pile (4) is fixedly connected with a handle (5), the upper side of the deflection pile (4) is fixedly connected with a fixed disc (6), the upper side of the fixed disc (6) is fixedly connected with a first laser ranging module (7), the lower side of the stand (1) is provided with a measurement mechanism (8), the upper side of the outer wall of the stand (1) is provided with a deflection mechanism (10), the outer wall of the deflection pile (4) is provided with a correction mechanism (9), and the outer wall of the deflection pile (4) is further fixedly connected with a control display module (11). The measurement mechanism (8) is used for detecting the distance of the pre-buried bolt at the ladder beam at the upper and lower ladder sections. The deflection mechanism (10) can adjust the angle of the insertion rod (3) relative to the stand (1).

2. The prefabricated stair construction measuring device according to claim 1, characterized in that: The measurement mechanism (8) comprises a first horizontal detection module (801), the first horizontal detection module (801) is located in the middle of the side wall of the stand (1), and the side wall of the first horizontal detection module (801) is fixedly connected with the side wall of the stand (1), the measurement mechanism (8) further comprises a fixed rod (802), the fixed rod (802) is located at the lower side of the stand (1), the upper side of the outer wall of the fixed rod (802) is fixedly connected with the inner wall of the lower end of the stand (1), the lower end side wall of the fixed rod (802) is fixedly connected with an angle encoder (803), the input end of the angle encoder (803) is fixedly connected with an articulated arm (804), the lower end of the articulated arm (804) is rotationally connected with a fixed sleeve (805) through a bearing, the lower side of the fixed sleeve (805) is fixedly connected with a counterweight (806), the middle inner wall of the fixed sleeve (805) is fixedly connected with a second laser ranging module (807), the outer wall of the deflection pile (4) is fixedly connected with a second horizontal detection module (808), and the upper side of the fixed rod (802) is fixedly connected with a third laser ranging module (809).

3. The prefabricated stair construction measuring device according to claim 2, characterized in that: The first horizontal detection module (801), the second laser ranging module (807), the second horizontal detection module (808), the third laser ranging module (809), and the angle encoder (803) are electrically connected with the control display module (11), the first laser ranging module (7) is electrically connected with the control display module (11), and the mass of the counterweight (806) is greater than that of the second laser ranging module (807).

4. The prefabricated stair construction measuring device according to claim 3, characterized in that: The correction mechanism (9) includes a first drive motor (901), the outer wall of the first drive motor (901) is fixedly connected with the side wall of the deflection pile (4), the output end of the first drive motor (901) is fixedly connected with a transmission wheel (902), the lower surface of the fixed disc (6) is rotatably connected with a rotating disc (903) through a bearing, the outer wall of the rotating disc (903) is fixedly connected with a transmission plate (904) on the side close to the first drive motor (901), the outer wall of the transmission plate (904) is in contact with the outer wall of the transmission wheel (902), and the side, away from the first drive motor (901), of the rotating disc (903) is fixedly connected with a laser interference module (905).

5. The prefabricated stair construction measuring device according to claim 4, characterized in that: The first drive motor (901) can drive the rotating disc (903) to rotate through the transmission wheel (902), and the laser interference module (905) and the first drive motor (901) are electrically connected with the control display module (11), and the detection end of the laser interference module (905) is vertically arranged with the detection end of the first laser ranging module (7).

6. The prefabricated stair construction measuring device according to claim 5, characterized in that: The deflection mechanism (10) includes a fixed frame (101), the outer wall of the upper side of the stand column (1) is fixedly connected with the fixed frame (101), the inner wall of the fixed frame (101) is fixedly connected with a second drive motor (102), the output end of the second drive motor (102) is fixedly connected with a gear (103), the upper end of the stand column (1) is rotatably connected with a transmission sleeve (104) through a bearing, the inner wall of the transmission sleeve (104) is in contact with the outer wall of the plug rod (3), and the outer wall of the transmission sleeve (104) is in mesh with the outer wall of the gear (103).

7. The prefabricated stair construction measuring device according to claim 6, characterized in that: The lower end of the plug rod (3) is in a cylindrical structure, the middle part of the plug rod (3) is in a hexagonal prism structure, and the outer wall of the lower end of the plug rod (3) is in contact with the inner wall of the stand column (1).

8. The prefabricated stair construction measuring device according to claim 7, characterized in that: The second drive motor (102) is electrically connected with the control display module (11), and the control display module (11) can drive the gear (103) and the transmission sleeve (104) to rotate through the second drive motor (102), so that the plug rod (3) and the stand column (1) are relatively deflected.

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