A precast box girder inner formwork construction measurement device

Abstract

The application relates to the technical field of prefabricated box girder assembly, in particular to a prefabricated box girder inner mold construction measuring device, which comprises an outer mold, an inner film is arranged in the inner mold, a distance sensor for measuring and calibrating the position of the inner film in the outer mold is arranged on the front side of the outer mold, an adjusting mechanism for adjusting the level of the distance sensor is arranged on the front side of the outer mold, a detection mechanism for adjusting the left-right direction position and the inclination angle of the distance sensor is arranged on the adjusting mechanism, the detection mechanism comprises an adjusting piece which is slidably arranged on the adjusting mechanism, an electric telescopic rod is fixedly arranged on the rear side of the adjusting piece through a mounting sleeve, and the rear side of the mounting sleeve is fixedly connected with the distance sensor. Through the arrangement of the distance sensor, the horizontal and central positions of the inner film in the outer mold can be measured after the inner film is placed; different measuring steps can be completed through one device; and the measuring steps of the inner film in the installation process are simplified.

Description

Technical Field

[0001] This invention relates to the field of precast box girder assembly technology, specifically to a precast box girder inner formwork construction measurement device. Background Technology

[0002] Precast box girders are commonly used components in bridge construction in civil engineering. They belong to a type of precast concrete structure. When precast box girders are precast, the outer mold is first assembled. Then, a steel frame is placed inside the outer mold. Next, the inner mold is hoisted to the inside of the outer mold, with the steel frame placed between the inner and outer molds. Finally, concrete is poured between the inner and outer molds to prepare the precast box girder.

[0003] When installing the inner mold, it is necessary to measure the placement position of the inner mold. When measuring and testing the different states of the inner mold, corresponding equipment is required. For example, when testing the horizontal state of the inner mold, an electronic level is required, and when testing the center position of the inner mold, a total station is required.

[0004] When measuring the state of the internal mold using existing methods, multiple measuring devices are required, making the entire measurement process complicated and affecting measurement efficiency. When using each device for measurement, if the position needs to be moved, the device itself must first be calibrated. The calibration methods for different devices are different, which affects the measurement efficiency when measuring at different positions. Summary of the Invention

[0005] Therefore, the present invention provides a construction measurement device for the inner formwork of precast box girders, which solves the above-mentioned technical problems.

[0006] The present invention provides a precast box girder inner formwork construction measurement device, including an outer formwork, an inner formwork placed inside the outer formwork, a distance sensor for measuring and calibrating the position of the inner formwork inside the outer formwork is provided in front of the outer formwork, an adjustment mechanism for adjusting the horizontal position of the distance sensor is provided in front of the outer formwork, and a distance sensor for adjusting the left and right position and tilt angle of the distance sensor is provided on the adjustment mechanism.

[0007] The detection mechanism includes an adjusting component that slides left and right on an adjusting mechanism. An electric telescopic rod is fixedly installed on the rear side of the adjusting component via an mounting sleeve. The rear side of the mounting sleeve is fixedly connected to a distance sensor. A detection component for calibrating the position of the distance sensor is provided on the rear side of the distance sensor. An auxiliary component for measuring the gap distance is provided at the telescopic end of the electric telescopic rod.

[0008] According to an embodiment of the present invention, a horizontal bubble tube is embedded in the upper surface of the lower horizontal section of the rectangular frame, and the distance sensor is electrically connected to an external display device.

[0009] According to an embodiment of the present invention, the leveling component includes an adjusting slider that is slidably connected to the vertical section of a rectangular frame. A support foot is fixedly connected to the lower surface of the adjusting slider. A positioning sleeve is fixedly connected to the vertical section of the rectangular frame above the adjusting slider. An adjusting screw is threaded onto the positioning sleeve. The bottom end of the adjusting screw is rotatably connected to the upper surface of the adjusting slider via a bearing.

[0010] According to an embodiment of the present invention, the adjusting member includes an electric slide block slidably connected to a horizontal section of a rectangular frame in the left-right direction, a sliding rail fixedly connected between the opposite surfaces of the two electric slide blocks, an electric slider slidably connected to the sliding rail in the up-down direction, a fixed disk fixedly connected to the rear side of the electric slider, a rotating disk rotatably connected to the rear side of the fixed disk, and the rear surface of the rotating disk fixedly connected to the mounting sleeve.

[0011] According to an embodiment of the present invention, both the fixed disk and the rotating disk are provided with alignment arrows at the top of their circumferential surfaces to facilitate adjusting the electric telescopic rod to a vertical position, and the fixed disk and the rotating disk are in friction fit.

[0012] According to an embodiment of the present invention, the auxiliary component includes a reflector plate hinged to the bottom end of the telescopic section of the electric telescopic pole. The reflector plate has two left-right symmetrical mounting grooves. Two vertically arranged sliding rods are fixedly connected inside the mounting grooves. A calibration strip is slidably connected to the circumferential surface of the two sliding rods. The calibration strip slides in cooperation with the mounting grooves.

[0013] According to an embodiment of the present invention, a reset spring is sleeved on the circumferential surface of the slide bar between the upper surface of the calibration bar and the inner wall of the top end of the mounting groove, and the calibration bar is provided with a scale.

[0014] According to an embodiment of the present invention, the auxiliary component further includes two symmetrical inverted L-shaped limiting rods fixedly connected to the left and right sides of the fixed section of the electric telescopic rod. A plurality of evenly distributed auxiliary rollers are rotatably connected to the vertical section of the inverted L-shaped limiting rods. The auxiliary rollers change the sliding friction between the inverted L-shaped limiting rods and the reflector from rolling friction. A limiting plate is fixedly connected to the rear side of the bottom end of the telescopic section of the electric telescopic rod to limit the rotation angle of the reflector on the electric telescopic rod.

[0015] According to an embodiment of the present invention, the detection component includes a calibration plate fixedly connected to the rear side of the distance sensor. Two symmetrical mounting slots are formed on the upper surface of the calibration plate. A horizontally arranged slide rod is fixedly connected inside the mounting slot. A calibration strip is slidably connected to the circumference of the slide rod in the front-back direction. The calibration strip slides in cooperation with the mounting slot.

[0016] According to an embodiment of the present invention, a reset spring is sleeved on the circumferential surface of the slide bar two between the front surface of the calibration bar two and the inner wall of the front side of the mounting groove one, and the calibration bar two is also provided with a scale.

[0017] The technical solution of this invention is as follows: 1. By setting up a detection mechanism, the position of the inner mold in the outer mold can be measured horizontally and centered after the inner mold is placed. Different measurement steps can be completed by one device, simplifying the measurement steps of the inner mold during installation.

[0018] 2. The adjustment mechanism ensures that the distance sensor is horizontal before measurement begins. The adjustment mechanism can move flexibly and allows for direct observation of whether the position is horizontal after movement. This facilitates the measurement of the inner mold position by moving the sensor to different positions, thus improving measurement efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the precast box girder inner formwork construction measurement device provided by the present invention.

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the adjustment mechanism provided by the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the testing mechanism provided by the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the leveling component provided by the present invention.

[0024] Figure 5 This is a three-dimensional structural schematic diagram of the adjusting component provided by the present invention.

[0025] Figure 6 This invention provides Figure 5 Enlarged view of part A in the middle.

[0026] Figure 7 This is a three-dimensional structural diagram of the auxiliary component provided by the present invention.

[0027] Figure 8 This is a schematic diagram illustrating the state change of the reflector provided by the present invention from a vertical state to a horizontal state.

[0028] Figure 9 This is a schematic diagram showing the position of the reflector and calibration plate provided by the present invention between the opposing surfaces of the inner and outer molds.

[0029] Reference numerals: 1. Adjustment mechanism; 2. Detection mechanism; 3. Distance sensor; 100. Inner mold; 200. Outer mold; 11. Rectangular frame; 12. Leveling component; 21. Adjusting component; 22. Electric telescopic rod; 23. Auxiliary component; 24. Detection component; 121. Adjusting screw; 122. Positioning sleeve; 123. Adjusting slider; 124. Support foot; 211. Electric slide block; 212. Sliding track; 213. Electric slider; 214. Fixed plate; 215. Rotating plate; 231. Inverted L-shaped limiting rod; 232. Limiting plate; 233. Slide rod one; 234. Calibration strip one; 235. Reflector; 236. Mounting slot one; 241. Calibration plate; 242. Slide rod two; 243. Calibration strip two; 244. Mounting slot two. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 As shown, a precast box girder inner formwork construction measurement device includes an outer formwork 200, an inner formwork 100 placed inside the outer formwork 200, a distance sensor 3 for measuring and calibrating the position of the inner formwork 100 inside the outer formwork 200 is provided in front of the outer formwork 200, an adjustment mechanism 1 for adjusting the horizontal position of the distance sensor 3 is provided in front of the outer formwork 200, and a detection mechanism 2 for adjusting the left-right position and tilt angle of the distance sensor 3 is provided on the adjustment mechanism 1.

[0032] like Figure 1 and Figure 2 As shown, the adjustment mechanism 1 includes a rectangular frame 11, with leveling components 12 on both vertical sections of the rectangular frame 11. A horizontal bubble tube is embedded on the upper surface of the lower horizontal section of the rectangular frame 11. The distance sensor 3 is electrically connected to an external display device. The distance sensor 3 can be an infrared distance sensor or a laser distance sensor.

[0033] like Figure 1 and Figure 3As shown, the detection mechanism 2 includes an adjusting component 21 that slides left and right on the adjusting mechanism 1. An electric telescopic rod 22 is fixedly installed on the rear side of the adjusting component 21 through an mounting sleeve. The rear side of the mounting sleeve is fixedly connected to the distance sensor 3. A detection component 24 for calibrating the position of the distance sensor 3 is provided on the rear side of the distance sensor 3. An auxiliary component 23 for assisting the distance sensor 3 in measuring the gap distance is provided at the telescopic end of the electric telescopic rod 22.

[0034] In practical use, the inner mold 100 is first hoisted into the inner side of the assembled outer mold 200 using external equipment. After the inner mold 100 is hoisted into the outer mold 200, the rectangular frame 11 is moved to the front of the inner mold 100 and the outer mold 200. The leveling component 12, in conjunction with the horizontal bubble tube on the rectangular frame 11, is used to adjust the rectangular frame 11 to a horizontal position. Then, the position of the distance sensor 3 in the vertical direction is adjusted using the adjusting component 21, so that the distance sensor 3 is above the inner mold 100. At this time, the adjusting component 21 is moved left and right on the rectangular frame 11. The operator judges whether the front end of the inner mold 100 is in a horizontal state by reading the value on the external display device. Then, the rectangular frame 11 is moved to the rear of the inner mold 100, and the above steps are repeated to measure the horizontal state of the rear of the inner mold 100.

[0035] After completing the horizontal measurement, based on the tilt angle of the opposing surfaces of the inner mold 100 and the outer mold 200, the operator adjusts the tilt angle of the distance sensor 3 using the adjusting component 21 to be close to the tilt angle of the opposing surfaces of the inner mold 100 and the outer mold 200. The electric telescopic rod 22 extends and pushes the auxiliary component 23 downward to fit against the outer wall of the inner mold 100. At this time, the distance between the opposing surfaces of the inner mold 100 and the outer mold 200 is measured in conjunction with the distance sensor 3. The operator judges whether the position of the inner mold 100 inside the outer mold 200 is centered based on the reading on the external display device.

[0036] like Figure 2 and Figure 4 As shown, the leveling component 12 includes an adjusting slider 123 that is slidably connected to the vertical section of the rectangular frame 11. A support foot 124 is fixedly connected to the lower surface of the adjusting slider 123. A positioning sleeve 122 is fixedly connected above the adjusting slider 123 on the vertical section of the rectangular frame 11. An adjusting screw 121 is threadedly connected to the positioning sleeve 122. The bottom end of the adjusting screw 121 is rotatably connected to the upper surface of the adjusting slider 123 through a bearing.

[0037] In practical use, when adjusting the leveling component 12 in conjunction with the horizontal bubble tube on the rectangular frame 11 to adjust the horizontal state of the rectangular frame 11, the operator rotates the adjusting screw 121 on the positioning sleeve 122. As the adjusting screw 121 continues to rotate, it displaces on the positioning sleeve 122. The adjusting screw 121 drives the adjusting slider 123 to slide on the rectangular frame 11, and simultaneously drives the support feet 124 to move synchronously. By observing the position of the bubble in the horizontal bubble tube on the rectangular frame 11, the operator selects to rotate the rectangular frame 11 on the left and right sides in either the forward or reverse direction, thereby adjusting the left and right support feet 124 to move up or down, and adjusting the rectangular frame 11 to be horizontal.

[0038] like Figure 3 and Figure 5 As shown, the adjusting component 21 includes an electric slide block 211 that is slidably connected to the horizontal section of the rectangular frame 11 in the left-right direction. A sliding rail 212 is fixedly connected between the opposite surfaces of the two electric slide blocks 211. An electric slider 213 is slidably connected to the sliding rail 212 in the up-down direction. A fixed plate 214 is fixedly connected to the rear side of the electric slider 213. A rotating plate 215 is rotatably connected to the rear side of the fixed plate 214. The rear surface of the rotating plate 215 is fixedly connected to the mounting sleeve.

[0039] like Figure 3 and Figure 5 As shown, both the fixed disk 214 and the rotating disk 215 have alignment arrows at the top of their circumferential surfaces to facilitate adjusting the electric telescopic rod 22 to a vertical position. The fixed disk 214 and the rotating disk 215 are in friction fit, and the rotating disk 215 remains stationary on the fixed disk 214 when it is not subjected to external force.

[0040] In practical use, after the rectangular frame 11 is adjusted to a horizontal position, when the distance sensor 3 is driven by the adjusting component 21 to measure the horizontal position of the inner mold 100: First, the electric slider 213 slides up and down on the sliding rail 212, and the distance sensor 3 moves synchronously through the fixed plate 214 and the rotating plate 215, adjusting the position of the distance sensor 3 to be above the inner mold 100. Then, the electric slide block 211 slides left and right on the rectangular frame 11, and the electric slider 213 moves synchronously through the sliding rail 212. At this time, the distance sensor 3 moves horizontally above the inner mold 100. During the movement of the distance sensor 3, the operator judges whether the position of the inner mold 100 is horizontal based on the reading on the external display device.

[0041] like Figure 3 and Figure 7As shown, the auxiliary component 23 includes a reflector 235 hinged to the bottom end of the telescopic section of the electric telescopic rod 22. A torsion spring (not shown in the figure) is provided at the hinge position between the reflector 235 and the telescopic section of the electric telescopic rod 22. When the reflector 235 is in a vertical state on the telescopic section of the electric telescopic rod 22, the torsion spring is in a tightened state. Two left-right symmetrical mounting slots 236 are provided on the reflector 235. Two vertically arranged sliding rods 233 are fixedly connected inside the mounting slots 236. A calibration strip 234 is slidably connected to the circumferential surface of the two sliding rods 233. The calibration strip 234 slides in cooperation with the mounting slots 236. A return spring is sleeved on the circumferential surface of the sliding rod 233 between the upper surface of the calibration strip 234 and the inner wall of the top of the mounting slot 236. The calibration strip 234 is provided with a scale.

[0042] like Figure 3 , Figure 7 and Figure 8 As shown, the auxiliary component 23 also includes two symmetrical inverted L-shaped limiting rods 231 fixedly connected to the left and right sides of the fixed section of the electric telescopic rod 22. Multiple evenly distributed auxiliary rollers are rotatably connected to the vertical section of the inverted L-shaped limiting rods 231. The auxiliary rollers change the sliding friction between the inverted L-shaped limiting rods 231 and the reflector 235 to rolling friction. A limiting plate 232 is fixedly connected to the rear side of the bottom end of the telescopic section of the electric telescopic rod 22 to limit the rotation angle of the reflector 235 on the electric telescopic rod 22.

[0043] In practical use, after the rectangular frame 11 has been adjusted to a horizontal position, when the distance sensor 3 is driven by the adjusting component 21 to measure the centering state of the inner mold 100: First, the operator applies a pushing force to the electric telescopic rod 22 according to the degree of inclination between the opposing surfaces of the inner mold 100 and the outer mold 200. The electric telescopic rod 22 deflects and drives the rotating disk 215 to rotate on the fixed disk 214 through the mounting sleeve, adjusting the tilt angle of the distance sensor 3 to be close to the tilt angle between the opposing surfaces of the inner mold 100 and the outer mold 200. At this time, the electric telescopic rod 22 extends, pushing the reflector... As plate 235 moves away from the inverted L-shaped limiting rod 231, the auxiliary roller on the inverted L-shaped limiting rod 231 reduces the friction between the reflector plate 235 and the inverted L-shaped limiting rod 231, facilitating relative sliding between them. When the reflector plate 235 moves away from the inverted L-shaped limiting rod 231, the torsion spring between the reflector plate 235 and the electric telescopic rod 22, combined with the limiting action of the limiting plate 232, causes the reflector plate 235 to change from a horizontal state to a vertical state with respect to the electric telescopic rod 22 (e.g., ...). Figure 8 (As shown).

[0044] like Figure 3 , Figure 6 and Figure 9As shown, the detection component 24 includes a calibration plate 241 fixedly connected to the rear side of the distance sensor 3. Two symmetrical mounting slots 244 are opened on the upper surface of the calibration plate 241. A horizontally arranged slide rod 242 is fixedly connected inside the mounting slot 244. A calibration strip 243 is slidably connected to the circumference of the slide rod 242 in the front-back direction. The calibration strip 243 slides in cooperation with the mounting slot 244. A reset spring 2 is sleeved on the circumference of the slide rod 242 between the front surface of the calibration strip 243 and the front inner wall of the mounting slot 236. The calibration strip 243 is also provided with a scale.

[0045] In practical use, as the electric telescopic rod 22 extends, when the distance between the reflector 235 and the fixed plate 214 approaches the distance between the opposing surfaces of the inner mold 100 and the outer mold 200, the electric telescopic rod 22 stops extending. The operator then moves the rectangular frame 11 to place the reflector 235 and the calibration plate 241 between the opposing surfaces of the inner mold 100 and the outer mold 200 (e.g., ...). Figure 9 As shown), the rectangular frame 11 is adjusted to be horizontal. At this time, both the reflector 235 and the calibration plate 241 are inserted into the space between the inner mold 100 and the outer mold 200. Since the second calibration strip 243 and the first calibration strip 234 are both stuck on the outer edge of the front end of the outer mold 200 and the inner mold 100, the second calibration strip 243 and the first calibration strip 234 are both resisted by the inner mold 100 and the outer mold 200, and slide a certain distance inside the second mounting groove 244 and the first mounting groove 236 respectively. At the same time, the first return spring and the return spring When both springs are compressed, the operator uses the scales on calibration strip 234 and calibration strip 243 to determine whether the reflector 235 and calibration plate 241 are in contact with the surfaces of the inner mold 100 and the outer mold 200. For example, to determine whether the calibration plate 241 is in contact with the surface of the outer mold 200, the operator uses the scales on the two calibration strips 243 on the calibration plate 241. When the calibration plate 241 is fully in contact with the outer mold 200, the scales of the two calibration strips 243 extending from the outer edge of the front end of the outer mold 200 are consistent.

[0046] Then, the staff repeated the above steps to measure multiple positions on the opposite surfaces of the inner mold 100 and the outer mold 200, and determined whether the position of the inner mold 100 inside the outer mold 200 was centered based on the readings on the external display device of the multiple measurements.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A precast box girder inner formwork construction measuring device, comprising an outer formwork, an inner formwork placed inside the outer formwork, and a distance sensor disposed in front of the outer formwork for measuring and calibrating the position of the inner formwork inside the outer formwork, characterized in that: The front of the outer mold is provided with an adjusting mechanism for adjusting the level of the distance sensor, and the adjusting mechanism is provided with a detection mechanism for adjusting the left-right direction position and the inclination angle of the distance sensor; The detection mechanism comprises an adjusting piece slidingly arranged on the adjusting mechanism, and the rear side of the adjusting piece is fixedly connected with an electric telescopic rod through a mounting sleeve, the rear side of the mounting sleeve is fixedly connected with the distance sensor, the rear side of the distance sensor is provided with a detection piece for calibrating the position of the distance sensor, and the telescopic end of the electric telescopic rod is provided with an auxiliary piece for assisting the distance sensor in measuring the gap distance. The adjusting mechanism comprises a rectangular frame, and leveling pieces are arranged on the two vertical sections of the rectangular frame. The adjusting piece comprises an electric sliding seat slidingly connected on the horizontal section of the rectangular frame in the left-right direction, and the opposite faces of the two electric sliding seats are fixedly connected with a sliding rail, the sliding rail is slidingly connected with an electric sliding block in the up-down direction, the rear side of the electric sliding block is fixedly connected with a fixed disc, the rear side of the fixed disc is rotatably connected with a rotating disc, the rear surface of the rotating disc is fixedly connected with the mounting sleeve, the fixed disc and the rotating disc are in friction fit, and the rotating disc remains stationary on the fixed disc when not subjected to external force. The distance sensor is displaced in the horizontal direction on the adjusting mechanism by the adjusting piece, so that whether the inner mold is horizontally positioned inside the outer mold can be detected, and the inclination angle of the distance sensor is adjusted by the adjusting piece, and the auxiliary piece and the detection piece are clamped in the gap between the inner mold and the outer mold to detect whether the inner mold is centrally positioned inside the outer mold.

2. The precast box girder inner form construction measuring device of claim 1, wherein: A horizontal bubble tube is embedded on the upper surface of the lower horizontal section of the rectangular frame, and the distance sensor is electrically connected with an external display device.

3. The precast box girder inner form construction measuring device of claim 1, wherein: The leveling piece comprises an adjusting sliding block slidingly connected on the vertical section of the rectangular frame in the up-down direction, the lower surface of the adjusting sliding block is fixedly connected with a supporting leg, the vertical section of the rectangular frame is fixedly connected with a positioning sleeve above the adjusting sliding block, the positioning sleeve is threadedly connected with an adjusting screw, and the bottom end of the adjusting screw is rotatably connected with the upper surface of the adjusting sliding block through a bearing.

4. The precast box girder inner form construction measuring device of claim 1, wherein: The circumferential surface top ends of the fixed disc and the rotating disc are provided with alignment arrows for adjusting the electric telescopic rod to the setting state, and the fixed disc and the rotating disc are in friction fit.

5. The precast box girder inner form construction measuring device of claim 1, wherein: The auxiliary piece comprises a reflecting plate hingedly connected to the bottom end of the telescopic section of the electric telescopic rod, two left-right symmetrical mounting grooves are formed in the reflecting plate, two vertical sliding rods are fixedly connected in the mounting grooves, a calibration strip is slidingly connected on the circumferential surface of the sliding rods, and the calibration strip is in sliding fit with the mounting grooves.

6. The precast box girder inner form construction measuring device of claim 5, wherein: A reset spring is sleeved on the circumferential surface of the sliding rod between the upper surface of the calibration strip and the top end inner wall of the mounting groove, and the calibration strip is provided with a scale.

7. The precast box girder inner form construction measuring device of claim 1, wherein: The auxiliary piece further comprises two symmetrical inverted L-shaped limiting rods fixedly connected to the left and right side surfaces of the fixed section of the electric telescopic rod, a plurality of uniformly distributed auxiliary rollers are rotatably connected to the vertical sections of the inverted L-shaped limiting rods, the auxiliary rollers change the sliding friction between the inverted L-shaped limiting rods and the reflecting plate into rolling friction, and a limiting plate is fixedly connected to the rear side of the bottom end of the telescopic section of the electric telescopic rod for limiting the rotating angle of the reflecting plate on the electric telescopic rod.

8. The precast box girder inner form construction measuring device of claim 1, wherein: The detection piece comprises a calibration plate fixedly connected at the rear side of the distance sensor, the upper surface of the calibration plate is provided with two left-right symmetrical installation grooves two, the inside of the installation groove two is fixedly connected with a horizontally arranged slide rod two, the circumferential surface of the slide rod two is slidably connected with a calibration strip two in the front-rear direction, and the calibration strip two is in sliding fit with the installation groove two.

9. The precast box girder inner form construction measuring device of claim 8, wherein: The circumferential surface of the slide rod two is sleeved with a reset spring two between the front surface of the calibration strip two and the front side inner wall of the installation groove one, and the calibration strip two is also provided with a scale.

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