Modular construction internal positioning method and positioning device

Abstract

This invention provides a modular construction internal positioning method and device, including the setting of internal construction measurement benchmarks, the setting of instrument mounting bases, the mounting of instruments on a centering plate, and the setting of temporary turning points at the top of the module. The base of the temporary turning points is fixed to the top of the module by adjustable bolts. The coordinates are obtained by measuring with instruments set up at external secondary network points. The distance and orientation of the temporary turning points are measured on the forced centering plate, the coordinates of the measuring station are calculated, the coordinates are input into the instrument, and the instrument orientation is reset for internal construction positioning. This method solves the problem of not being able to set up measuring instruments inside the module and lacking control benchmarks. It can make full use of sleeves, setting up support frames, and temporary turning points at the top of the module to solve the positioning problem during the construction of the bottom plate inside the module. It also solves the problem of not being able to arrange positioning axes in confined spaces, which is beneficial to ensuring measurement accuracy, improving labor productivity, and helping to meet the needs of optimizing construction progress.

Description

Technical fields:

[0001] This invention belongs to the field of civil engineering construction technology, specifically relating to a modular construction internal positioning method and positioning device, which is suitable for areas with narrow spaces, high surroundings, and inconvenient control point layout. Background technology:

[0002] The traditional construction process for nuclear power reactor buildings involves first constructing the floor slabs, then the walls, proceeding sequentially. Floor slab construction offers a wide field of vision, allowing for the placement of measurement control points on the internal floor slabs, wall tops, and surrounding areas. A variety of measurement and positioning methods are available. For floor slab positioning, points can be initially placed on the wall tops, ensuring safety, reliability, and stability.

[0003] my country's nuclear power industry has entered a period of safe and efficient development. With the advancement of marketization, nuclear power plant owners are increasingly demanding higher standards for shortening construction periods, reducing project costs, and improving project quality. Modular design and construction technology, proven in domestic and international nuclear power construction, is an effective way to reduce on-site construction work, minimize safety hazards, shorten construction periods, and lower project costs. It is also one of the effective measures currently being taken in my country to address the contradiction between safe and efficient mass construction of nuclear power plants and resource shortages, as well as quality and safety concerns.

[0004] Modular construction technology has fundamentally changed the traditional nuclear power plant construction model, gradually shifting from a decentralized, labor-intensive approach to an intensive, prefabricated model within factories. It introduces parallel operations into traditional construction concepts, relying on advanced design, manufacturing, and construction technologies to deeply integrate civil engineering, installation, and commissioning processes, significantly impacting the construction period, cost, quality, and safe and civilized construction of nuclear power projects.

[0005] Nuclear power plant reactor buildings and auxiliary buildings are constructed using modular construction, with modules exceeding 20 meters in height. This results in the internal structural floor slabs being divided into small sections within confined spaces. Furthermore, the introduction of modules makes it impossible to properly set up control points. Apart from the modules being tall vertical structures, the others are located at relatively low levels, making it impossible to guarantee the necessary distance and visibility. This leads to difficulties in measuring and positioning the internal structural floor slabs and walls.

[0006] Therefore, this invention provides a modular construction internal positioning method and device. By using a module through-sleeve to set up a support frame, setting up a total station on the support frame, and using a temporary prism point set at the top of the module, the problem of setting measurement control points is solved, effectively solving the problem of internal structure measurement and positioning, ensuring the quality of internal structure construction. It not only reduces the need for surveyors to climb to high places for observation, but also increases work efficiency several times, providing an effective guarantee for construction quality. Summary of the Invention:

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a modular construction internal positioning method and device, which overcomes the problem that control points cannot be properly arranged due to the modular construction of the internal structure. It is easy to operate, optimizes the project progress, and ensures stable and reliable measurement quality.

[0008] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0009] (I) A modular construction internal positioning method, comprising the following steps:

[0010] Step 1: Install a support frame on the module sleeve, and install a centering plate on the cantilever of the support frame;

[0011] Step 2: Set temporary prism points at two locations on the top of the module;

[0012] Step 3: Set up a total station at the external secondary network point and measure the coordinates of the two temporary prism points respectively;

[0013] Step 4: Set up the total station on the centering plate;

[0014] Step 5: Use a total station to measure the distance and azimuth of the two temporary prism points respectively;

[0015] Step 6: Calculate the coordinates of the total station on the centering plate, input the coordinates into the instrument, and then reset the orientation of the total station;

[0016] Step 7: Locate the internal construction axis. Set up a prism near the platform template positioning point, level it, and then measure the coordinates of the point using a total station.

[0017] Step 8: Compare the measured coordinates with the theoretical positioning coordinates, calculate the difference, move in the opposite direction, adjust the difference, and remeasure. Once the coordinates meet the requirements, set the point marker.

[0018] Step 9: Repeat steps 7 and 8 to determine the required points, and connect the points to form the required positioning axis.

[0019] Step 10: For the positioning of the arc line, set up a prism near the positioning point of the platform template, level it, and then measure the coordinates of the point using a total station.

[0020] Step 11: Compare the measured coordinates with the theoretical positioning coordinates, and calculate the radius deviation.

[0021] Step 12: Move in the opposite direction, adjust the difference, and measure again. Once the radius meets the requirements, set the point marker.

[0022] Step Thirteen: Repeat steps Ten, Eleven, and Twelve to determine the required points. Connect the points with an arc plate to obtain the required positioning radius line.

[0023] Furthermore, in step eight, after moving in the opposite direction, the measurement is repeated. When the deviation between the measured coordinates and the theoretical positioning coordinates is less than 2mm, it meets the requirements, and the point is marked as the layout point of the axis. In step twelve, after moving, an inspection is carried out. When the deviation is less than 2mm, the point is marked as the layout point of the radius and orientation.

[0024] Furthermore, in step thirteen, the distance between the two positioning points in the arc positioning does not exceed 2m.

[0025] (ii) A modular construction internal positioning device, comprising a total station, two temporary prism points and external secondary grid points; the total station is fixed on the wall sleeve of the first module by a mounting device, at a height of more than 1m above the base plate, and the two temporary prism points are set on the first module or the second module; the mounting point of the total station is in line with the two temporary prism points, and the external secondary grid points are in line with the two temporary prism points. Both the first and second modules are located inside the reactor building of the nuclear power plant. The first module is a circular steel containment vessel (CV) module, and the second module is a steel plate wall (CA01) module on the outer wall of a concrete structure. The CV module, as a steel containment vessel module, is the sealed metal structure of the nuclear island reactor building. Its main function is to prevent the leakage of radioactive materials in the event of an accident. It is one of the important safety protection barriers of the reactor building and belongs to the nuclear quality assurance level 1 and nuclear safety level 2 equipment. The steel plate is 43mm thick and is arranged in a circle with a certain radius around the center of the nuclear island. The CA01 module, as a steel plate wall module on the outer wall of a concrete structure, is the evaporator and refueling pool module. It is installed inside the bottom head of the steel containment vessel (CV). The overall dimensions are approximately 28.9m long, 23.5m high, and 27.9m wide.

[0026] Furthermore, the erection device includes a modular sleeve, which is a hollow cylindrical structure. The support frame is installed inside the modular sleeve and includes cantilevered channel steel and transverse support channel steel. Two or more sets of transverse support channel steel are arranged in parallel and installed horizontally inside the modular sleeve. The cantilevered channel steel is fixed above the transverse support channel steel and is also fixedly connected to each set of transverse support channel steel. The outer end of the cantilevered channel steel extends outside the modular sleeve, and a centering plate is fixedly installed on the upper surface of the outer end of the cantilevered channel steel. The total station is fixedly installed above the centering plate.

[0027] Furthermore, the cantilevered channel steel is fixedly connected to the transverse support channel steel via a fixing device; the fixing device includes a fixing plate, two sets of U-shaped steel bars, and two sets of nuts; the two sets of U-shaped steel bars are arranged in parallel and are both sleeved on the cantilevered channel steel, and the two sets of U-shaped steel bars are distributed on both sides of the transverse support channel steel, with the distance between the two sets of U-shaped steel bars being consistent with the width of the transverse support channel steel; the two sides of the U-shaped steel bars are provided with external threads, and the fixing plate is placed below the transverse support channel steel; the two sides of the U-shaped steel bars pass through the fixing plate and are threadedly connected and fixed with the nuts.

[0028] Furthermore, the transverse support channel steel is installed inside the module sleeve via an adjustable device; the adjustable device includes an adjustable top support and a support base; the support base is fixed to the lower surface inside the module sleeve, and a screw is provided on the support base; the adjustable top support is a hollow rod structure with an internal thread adapted to the screw; the upper end of the adjustable top support is rotatably connected to the transverse support channel steel, and the lower end is threadedly connected to the screw of the support base; by rotating the adjustable top support, it can be raised or lowered relative to the support base to achieve the height adjustment function.

[0029] Furthermore, the centering plate and the cantilevered channel steel are fixedly connected by several fixing bolts and pads; three fixing bolts are provided, located at three equal divisions of the circumference of the centering plate; the total station is fixedly installed above the centering plate by a central connecting bolt.

[0030] Furthermore, the temporary prism point includes a fixture base and a prism device; the fixture base is fixedly connected to the upper opening of the module, and the prism device is fixedly installed on the fixture base.

[0031] Furthermore, the tooling base is a channel steel structure with an opening facing downwards, and is fitted onto the upper opening of the module; the side wall of the tooling base has bolt holes, and is fixedly connected to the upper opening of the module by sturdy bolts.

[0032] Furthermore, the tooling base has bolt holes on its top surface, which are fixedly connected to the base of the prism device by base connecting bolts.

[0033] The beneficial effects of this invention are:

[0034] The present invention solves the problem of not being able to set up measurement control points normally in narrow spaces, and avoids problems such as obstruction of the measurement line of sight due to the introduction of modules, inability to locate through the line of sight, and the need to set up a separate measurement tower to install instruments. It is conducive to ensuring measurement accuracy, improving labor productivity, and helping to meet the needs of optimizing construction progress.

[0035] Repeated practice has proven that the method of the present invention has the following significant advantages:

[0036] 1. The various points of this invention are fixed by bolts, requiring no welding and without damaging the structural body;

[0037] 2. The tooling at each point of this invention can be reused, achieving the environmental protection and energy-saving requirements and reducing costs;

[0038] 3. The present invention provides flexible station setup, does not occupy space for other construction processes, and eliminates the need for climbing during observation, thereby improving measurement safety and reducing cost. Attached image description:

[0039] Figure 1This is a plan view of an embodiment of the present invention;

[0040] Figure 2 This is a schematic plan view of the through-sleeve support point according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic elevation view of the through-sleeve support point according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic cross-sectional view of the through-sleeve support point according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the elevation of the module prism point in an embodiment of the present invention;

[0044] Figure 6 This is a side view of the module prism point in an embodiment of the present invention;

[0045] 1: External secondary network point; 2: Through sleeve point; 3: Temporary point on module; 3A, 3B: Two temporary prism points; 4: First module; 5: Second module; 2-1: Centering plate; 2-2: Center connecting bolt; 2-3: Fixed connecting bolt; 2-4: Cantilever channel steel; 2-5: Lateral support channel steel; 2-6: Adjustable top support; 2-7: U-shaped steel bar; 2-8: Module sleeve; 2-9: Fixed pad; 2-10: Nut; 2-11: Support base; 2-12: Total station; 2-13: Pad; 3-1: Fastening bolt; 3-2: Tooling base; 3-3: Prism device base; 3-4: Base connecting bolt; 3-5: Prism; P, Total station point. Detailed implementation method:

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] Example 1

[0048] The reactor building of a nuclear power plant consists of an internal concrete structure and an outer steel plate module CA01, and an external circular steel containment vessel module CV. CA01 was hoisted into place in one go, while CV was hoisted in layers. During the construction of the +2.200m construction platform, a narrow space was formed inside, and the control points could not be arranged as usual. The completeness of the measurement and control work will directly affect the project quality and construction progress.

[0049] Therefore, embodiments of the present invention provide a modular construction internal positioning method, see [link to relevant documentation]. Figures 1 to 6 Specifically, it includes the following steps:

[0050] Step 1: Select a suitable location for the sleeve on the CV module wall, install a support frame on the module sleeve, and set the centering plate 2-1 on the cantilever of the support frame;

[0051] Step 2: Temporary prism points 3A and 3B are set at the top of the steel containment CV module and the concrete structure outer wall steel plate module CA01 module;

[0052] Step 3: Set up a total station at external secondary network point C04, backsight C07, and measure the coordinates of prism point 3A (X1205.2778, Y992.2127) and 3B (X1194.0260, Y987.5304).

[0053] Step 4: Set up the total station 2-12 on the centering plate 2-1 (point P);

[0054] Step 5: Using total station 2-12, measure the distance and azimuth of prism point 3A as 17.2346m and 20°11′56.1″, and the distance and azimuth of prism point 3B as 9.8132m and azimuth as 63°50′08.7″.

[0055] Step 6: Calculate the coordinates (X1195.7278, Y977.8659) of the total station 2-12 on the center plate 2-1. After inputting the coordinates into the instrument, reset the orientation of the total station 2-12 and perform internal construction positioning.

[0056] Step 7: Locate the internal construction axis X = 1192.50m. Set up a prism near the platform template positioning point, level it, and then measure the coordinates of the point (X1192.4315, Y979.1208) using a total station 2-12.

[0057] Step 8: Compare the measured coordinates with the theoretical positioning coordinates, calculate the difference δX = 1192.4315 - 1192.5000 = -0.0685m, adjust the difference to 0.0685m in the opposite direction northward, remeasure, the coordinates (X1192.4995, Y979.1311), the deviation is less than 2mm, which meets the requirements, set the point marker;

[0058] Step 9: Repeat steps 7 and 8 to determine the required points, and connect the points to form the required positioning axis.

[0059] Step 10: For the arc line positioning of the center (X1185.500, Y994.800), set up a prism near the positioning point of the platform template, level it, and then measure the coordinates of the point (X1192.1102, Y976.3256) using a total station 2-12.

[0060] Step 11: Compare the measured coordinates with the theoretical positioning coordinates, and calculate the radius deviation.

[0061]

[0062] Step 12: Move 0.121m in the opposite direction towards the reactor center, adjust the difference, and measure again to obtain (X1192.0094, Y976.4178). Calculate the radius deviation value:

[0063]

[0064] The deviation is less than 2mm, the radius meets the requirements, and the location marker is set.

[0065] Step 13: Repeat steps 10, 11, and 12 to determine the required points. Connect the points with an arc plate to form the required positioning radius line. The distance between two positioning points in the arc positioning shall not exceed 2m.

[0066] Furthermore, in step eight, after moving in the opposite direction and measuring again, if the deviation between the measured coordinates and the theoretical positioning coordinates is less than 2mm, it meets the requirements.

[0067] Example 2

[0068] This embodiment provides a positioning device based on the positioning method of Embodiment 1, referring to... Figure 1 As shown, the system includes a total station 2-12, two temporary prism points, and external secondary grid points. The total station 2-12 is fixed to the first module 4 via a mounting device. The two temporary prism points are set on either the first module 4 or the second module 5. Both the first module 4 and the second module 5 are located inside the reactor building of the nuclear power plant. The first module 4 is a circular steel containment vessel (CV) module, and the second module 5 is a concrete structure outer wall steel plate module (CA01). The mounting point of the total station 2-12 is in line of sight to the two temporary prism points, and the external secondary grid points are also in line of sight to the two temporary prism points.

[0069] Specifically, in this embodiment, the erection device includes a module sleeve 2-8, which is a hollow cylindrical structure. The support frame is installed inside the module sleeve 2-8 and includes cantilevered channel steel 2-4 and transverse support channel steel 2-5. Two or more sets of transverse support channel steel 2-5 are arranged in parallel and installed horizontally inside the module sleeve 2-8. The cantilevered channel steel 2-4 is fixed above the transverse support channel steel 2-5 and is also fixedly connected to each set of transverse support channel steel 2-5. The outer end of the cantilevered channel steel 2-4 extends to the outside of the module sleeve 2-8, and a centering plate 2-1 (φ200mm, 20mm thick centering plate) is fixedly installed on the upper surface of the outer end of the cantilevered channel steel 2-4. A total station 2-12 is fixedly installed above the centering plate 2-1. Specifically, the centering plate 2-1 and the cantilevered channel steel 2-4 are fixedly connected by three fixing bolts 2-3 (M14 bolts) and a 5mm thick pad 2-13. The three fixing bolts 2-3 are located at three equal divisions of the circumference of the centering plate 2-1. The total station 2-12 is fixedly installed above the centering plate 2-1 by a center connecting bolt 2-2 (M14 fixing screw).

[0070] In this embodiment, the cantilevered channel steel 2-4 is fixedly connected to the transverse support channel steel 2-5 by a fixing device; the fixing device includes a fixing pad 2-9, two sets of U-shaped steel bars 2-7, and two sets of nuts 2-10; the two sets of U-shaped steel bars 2-7 are arranged in parallel and are both sleeved on the cantilevered channel steel 2-4, and the two sets of U-shaped steel bars 2-7 are distributed on both sides of the transverse support channel steel 2-5, and the distance between the two sets of U-shaped steel bars 2-7 is consistent with the width of the transverse support channel steel 2-5; the two sides of the U-shaped steel bars 2-7 are provided with external threads, and the fixing pad 2-9 is set below the transverse support channel steel 2-5; the two sides of the U-shaped steel bars 2-7 pass through the fixing pad 2-9 and are threadedly connected and fixed with the nuts 2-10.

[0071] In this embodiment, the transverse support channel steel 2-5 is installed inside the module sleeve 2-8 via an adjustable device. The adjustable device includes an adjustable top support 2-6 and a support base 2-11. The support base 2-11 is fixed to the lower inner surface of the module sleeve 2-8, and a screw is provided on the support base 2-11. The adjustable top support 2-6 is a hollow rod structure with an internal thread adapted to the screw. The upper end of the adjustable top support 2-6 is rotatably connected to the transverse support channel steel 2-5, and the lower end is threadedly connected to the screw of the support base 2-11. By rotating the adjustable top support 2-6, it can be raised or lowered relative to the support base 2-11 to achieve height adjustment.

[0072] In this embodiment, the temporary prism point includes a fixture base 3-2 and a prism device. The fixture base 3-2 is fixedly connected to the upper opening of the module, and the prism device is fixedly mounted on the fixture base 3-2. Specifically, the fixture base 3-2 is a channel steel structure (100×70×60mm), with its opening facing downwards, and is fitted onto the upper opening of the module. Bolt holes are provided on the side wall of the fixture base 3-2, and it is fixedly connected to the upper opening of the module by fastening bolts 3-1 (5 / 8-inch connecting bolts). Bolt holes are provided on the top surface of the fixture base 3-2, and it is fixedly connected to the base of the prism device by base connecting bolts 3-4.

[0073] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method of modular construction interior positioning, characterized by, It comprises the following steps: Step one, set up a support frame on the module sleeve, the support frame cantilever sets the centering disc; Step two, set up two temporary prism points on the module upper opening; Step three, set up a total station from the external secondary network point to measure the coordinates of the two temporary prism points respectively; Step four, set up a total station on the centering disc; Step five, the total station measures the distance and direction of the two temporary prism points respectively; Step six, calculate the coordinates of the total station on the centering disc, input the coordinates into the instrument, and reset the orientation of the total station; Step seven, locate the internal construction axis, set up a prism near the platform template positioning point, and measure the point coordinate through the total station after leveling; Step eight, compare the measured coordinates with the theoretical positioning coordinate values, calculate the difference, move in the opposite direction, adjust the difference, re-measure, and set the point position mark when the coordinates meet the requirements; Step nine, repeat steps seven and eight to locate the required points, and connect the points to obtain the required positioning axis; Step ten, for arc line positioning, set up a prism near the platform template positioning point, and measure the point coordinate through the total station after leveling; Step eleven, compare the measured coordinates with the theoretical positioning coordinate values, and calculate the radius deviation value; Step twelve, move in the opposite direction, adjust the difference, re-measure, and set the point position mark when the radius meets the requirements; Step thirteen, repeat steps ten, eleven, and twelve to locate the required points, and connect the points with a circular arc plate to obtain the required positioning radius line.

2. The modular construction internal positioning method according to claim 1, wherein in step eight, after moving in the opposite direction and re-measuring, when the deviation value between the measured coordinates and the theoretical positioning coordinates is less than 2 mm, it meets the requirements; in step twelve, after moving in the opposite direction and re-measuring, when the deviation value between the measured coordinates and the theoretical positioning coordinates is less than 2 mm, it meets the requirements. In step thirteen, the distance between two points is not more than 2 m.

3. The modular construction interior positioning method of claim 1, wherein, 4. A modular construction internal positioning device for implementing the modular construction internal positioning method according to claim 1, comprising a total station (2-12), two temporary prism points, and an external secondary network point. The total station (2-12) is fixed on the wall sleeve of the first module (4) by a mounting device, with a height of more than 1 m from the bottom plate, the two temporary prism points are arranged on the first module (4) or the second module (5), the first module (4) and the second module (5) are arranged in the reactor building of a nuclear power plant, the first module (4) is a circular steel containment CV module, and the second module (5) is a concrete structure outer wall steel plate wall CA01 module; The mounting point of the total station (2-12) and the two temporary prism points are in visual communication, and the external secondary network point and the two temporary prism points are in visual communication.

5. The modular construction internal positioning device according to claim 4, wherein the mounting device comprises a module sleeve (2-8), the module sleeve (2-8) is a hollow cylindrical structure, a support frame is installed in the module sleeve (2-8), and the support frame comprises a cantilevered channel steel (2-4) and a transverse support channel steel (2-5). ​ ​ ​ The transverse support channel steel (2-5) is provided with two or more groups, is distributed in parallel, and is horizontally installed in the module sleeve (2-8); the cantilever channel steel (2-4) is fixed above the transverse support channel steel (2-5) and is fixedly connected with each group of transverse support channel steel (2-5); the outer end of the cantilever channel steel (2-4) extends to the outside of the module sleeve (2-8), and the outer end of the cantilever channel steel (2-4) is fixedly installed with the centering disc (2-1); and the total station (2-12) is fixedly installed above the centering disc (2-1).

6. The modular construction internal positioning device according to claim 5, wherein, the cantilever channel steel (2-4) is fixedly connected with the transverse support channel steel (2-5) through a fixing device; the fixing device comprises a fixing backing plate (2-9), two groups of U-shaped steel bars (2-7) and two groups of nuts (2-10); the two groups of U-shaped steel bars (2-7) are arranged in parallel, are sleeved on the cantilever channel steel (2-4), are distributed on the two sides of the transverse support channel steel (2-5), and the distance between the two groups of U-shaped steel bars (2-7) is consistent with the width of the transverse support channel steel (2-5); the two sides of the U-shaped steel bar (2-7) are provided with external threads, the fixing backing plate (2-9) is arranged below the transverse support channel steel (2-5); the two sides of the U-shaped steel bar (2-7) pass through the fixing backing plate (2-9) and are fixedly connected with the nuts (2-10) through threads.

7. The modular construction internal positioning device according to claim 5, wherein, the transverse support channel steel (2-5) is installed in the module sleeve (2-8) through an adjustable device; the adjustable device comprises an adjustable support (2-6) and a support base (2-11); the support base (2-11) is fixed to the lower surface in the module sleeve (2-8), the support base (2-11) is provided with a screw rod, the adjustable support (2-6) is a hollow rod structure, and an internal thread matched with the screw rod is arranged in the adjustable support (2-6); the upper end of the adjustable support (2-6) is rotatably connected with the transverse support channel steel (2-5), the lower end is threadedly connected with the screw rod of the support base (2-11), and the height adjustment effect is realized by rotating the adjustable support (2-6) to make it ascend or descend relative to the support base (2-11).

8. The modular construction internal positioning device according to claim 5, wherein, the centering disc (2-1) is fixedly connected with the cantilever channel steel (2-4) through fixing connection bolts (2-3) and backing plates (2-13); the fixing connection bolts (2-3) are arranged at three equal parts of the circumference of the centering disc (2-1); the total station (2-12) is fixedly installed above the centering disc (2-1) through a center connection bolt (2-2).

9. The modular construction internal positioning device according to claim 4, wherein, the temporary prism point comprises a tool base (3-2) and a prism device; the tool base (3-2) is fixedly connected with the upper opening of the module, and the prism device is fixedly installed on the tool base (3-2).

10. The modular construction interior positioning device according to claim 9, characterized in that, the tool base (3-2) is in the form of a channel steel structure with an opening downwardly and sleeved on the upper opening of the module; a bolt hole is formed in the side wall of the tool base (3-2) and fixedly connected with the upper opening of the module through a firm bolt (3-1); a bolt hole is formed in the top surface of the tool base (3-2) and fixedly connected with the base of the prism device through a base connecting bolt (3-4).

Images