A method for prefabrication, measurement and assembly of large PAU modules

Abstract

The invention discloses a method for prefabrication, measurement and assembly of a large-scale PAU module, comprising a prefabrication step and an assembly step; the prefabrication step comprises: analyzing the connection combination characteristics of each node according to a drawing, and formulating a feasible size control plan; after laying out the ground sample according to the size control plan, arranging the piers according to the pier layout diagram; after installing the components and completing self-inspection and inspection reporting, welding operations are performed and horizontal and coordinate data are measured and recorded; according to the horizontal and coordinate data, errors are adjusted and orthogonal reference points are corrected, and marking is performed to complete the prefabrication step; the assembly step comprises an early preparation step and a piece swinging step; the early preparation step comprises: according to the type of the pier, executing a steel pier placement step or a cement cast pier placement step; the piece swinging step comprises: using the first piece step to complete the placement of the first large-scale PAU module, and completing the closing placement of the second large-scale PAU module through the placement and positioning steps of the closing module.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale PAU modules, and in particular to a method for prefabrication, measurement and assembly of large-scale PAU modules. Background Art

[0002] In recent years, with the advancement of science and technology and the enhancement of comprehensive national strength, more and more foreign projects have been invested in my country, so that some large domestic heavy industry companies not only undertake domestic projects, but also undertake a number of foreign projects. However, foreign projects will have many strict requirements, and PAU projects will be involved among them.

[0003] PAU usually refers to process module, which is the most direct form of module. The applicant has undertaken a PAU project, which is a large-scale PAU module prefabricated and assembled in a factory. There are 12 groups with a total weight of 8,653 tons. Each group of modules includes steel structure frame assembly, equipment, pipeline, electrical, instrument installation, steel structure, pipeline anti-corrosion, pipeline insulation and other construction processes. The largest module is 21 meters long, 16.7 meters wide and 36.8 meters high, and the smallest module is 17 meters long, 10.7 meters wide and 23 meters high. The heaviest single module is 845 tons. These module frames are composed of 78 steel structures in total. There are 89 equipments installed in the modules, 6,528 finished pipelines and 23,000 inches of pipe welding. During on-site construction, the applicant found that it was difficult to measure and assemble large PAU modules using existing methods, because large PAU modules are generally large in size, which makes measuring their sizes and assembling them time-consuming and labor-intensive. Sometimes it takes almost a day to measure a large PAU module, which seriously affects the progress of the PAU project. In addition, the existing measurement and assembly methods also have the problem of low measurement and assembly accuracy. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a method for prefabrication, measurement and assembly of a large PAU module, which is used to solve the technical problems that the existing method for measuring and assembling large PAU modules is time-consuming, labor-intensive and low-precision, thereby achieving the purpose of improving the measurement and assembly efficiency and accuracy.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A method for prefabrication, measurement and assembly of a large PAU module, comprising a prefabrication step and an assembly step;

[0007] The prefabrication step includes: analyzing the connection combination characteristics of each node according to the drawing of the large PAU module, and formulating a feasible size control plan; after laying out the ground sample according to the size control plan, arranging the piers according to the pier layout diagram; after installing the components and completing the self-inspection and inspection, performing welding operations and measuring and recording the horizontal and coordinate data; according to the horizontal and coordinate data, adjusting the error and correcting the fitting orthogonal reference point, and marking the corrected fitting orthogonal reference point to complete the prefabrication step;

[0008] The final assembly step includes a preliminary preparation step and a piece placement step;

[0009] The preliminary preparation step includes: placing the piers as required, which are steel piers or cement piers, and performing the steel pier placement step or the cement pier placement step;

[0010] The sheet placement step includes: using the first sheet step to complete the placement of the first large PAU module, and completing the closing placement of the second large PAU module through the placement and positioning steps of the closing module.

[0011] As a preferred embodiment of the present invention, when laying out the ground sample according to the size control scheme, it includes:

[0012] According to the size control scheme, an orthogonal reference line is determined, the orthogonal reference line is clearly marked, and a station is set based on the orthogonal reference line;

[0013] Based on the welding shrinkage value and the temperature correction value, the vertical and horizontal axes are offset in sequence.

[0014] As a preferred embodiment of the present invention, when arranging the cushions according to the cushion layout diagram, it includes:

[0015] Use measuring instruments to control the horizontal error of the top surface of the pier within ±3mm, use positioning instruments to lead the ground reference line to the top surface of the pier, draw vertical and horizontal axes on the top surface of the pier in sequence according to the ground reference line, and after clearly marking the vertical and horizontal axes, conduct pier inspection.

[0016] As a preferred embodiment of the present invention, when installing the component, it includes:

[0017] First, install the longitudinal and transverse members close to the ground reference line, and use the longitudinal and transverse members as reference members;

[0018] Taking the reference component as a reference, the components on both sides are installed respectively, and it is determined whether the span of the components on both sides exceeds the span threshold. If so, piers are added under the components on both sides to control the welding errors of the components on both sides.

[0019] As a preferred embodiment of the present invention, when adjusting the error and correcting the fitting orthogonal reference point, it includes:

[0020] First, measure the horizontal data of each key node, and determine whether each key node has an out-of-tolerance according to the horizontal data. If so, adjust the out-of-tolerance to a qualified range;

[0021] The coordinate data of each key node is collected using a collection instrument, and the coordinate data is comprehensively analyzed using analysis software to correct the fitting orthogonal reference points.

[0022] As a preferred embodiment of the present invention, the step of placing the cement pouring pad comprises:

[0023] According to the pier layout diagram, mark the ground sample axis on the ground of the proposed construction area;

[0024] Setting an elevation reference point, measuring the ground height of each pier arrangement point, and obtaining the elevation increase or decrease value of each pier arrangement point according to the elevation reference point and the ground height;

[0025] Determine whether the elevation increase or decrease value of each pier arrangement point exceeds the elevation threshold, and if so, level the pier arrangement points exceeding the threshold to control the elevation increase or decrease value within the elevation threshold;

[0026] Laying steel plates at the pier arrangement points, and aligning the center line of the steel plates with the axis of the ground sample;

[0027] According to the axis size of the cement pouring pier, a positioning mark is made on the steel plate, and the cement pouring pier is placed according to the positioning mark;

[0028] Measuring the elevation of the upper surface of the cement pouring pad after placement, and controlling the error of the elevation by adding or removing pads;

[0029] Determine the support positions at both ends of the long axis of the large PAU module and set the reference line, extend the reference line to the top of the pad, and complete the cement pouring pad placement step.

[0030] As a preferred embodiment of the present invention, the step of placing the steel pier comprises:

[0031] After the elevation increase or decrease value of each cushion arrangement point is controlled within the elevation threshold, formwork is carried out according to the axis position of the ground sample, and concrete is poured to obtain each cushion layer, and the horizontal error of the upper surface of each cushion layer is controlled within ±3mm;

[0032] Place the steel piers according to the support layout diagram, determine the support positions at both ends of the long axis of the large PAU module and set the reference line, mark the intersection of the longitudinal and transverse axes on the top of the steel piers, and measure the elevation error and horizontal error of the upper surface of the steel piers after placement. If the errors meet the requirements, the steel piers will be inspected and the steel pier placement steps will be completed.

[0033] As a preferred embodiment of the present invention, when the first PAU module is placed using the first-piece step, it includes:

[0034] Use SPMT to transport the first large PAU module to the site, and place the first large PAU module in place according to the qualified position line and with reference to the welding data recorded in the prefabrication step, until the center lines of the four corner bases of the first large PAU module coincide with the center lines of the piers;

[0035] Use the angle code and prism to measure the level of the four corner bases, and after adjusting to a qualified level, collect the four corner coordinates of each of the four corner bases, the level value of the four corner base deck and the span of the four corner base columns, and analyze them;

[0036] According to the average horizontal value of the four-corner base deck, the settlement control point is made, and the positioning reference line and the closing line are drawn according to the four-corner coordinates of the four-corner base and the span of the four-corner base columns, and fixed marks are made on the four-corner base deck surface to complete the first piece step.

[0037] As a preferred embodiment of the present invention, when the second large PAU module is placed and positioned by placing and positioning the closing module, it includes:

[0038] Set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, draw vertical and horizontal axes on the ground according to the construction pier layout diagram, and mark the pier positions;

[0039] Measuring the ground height at the pier, obtaining the elevation increase and decrease values ​​of the ground at each position according to the average elevation of the first large PAU module deck, and leveling the ground at each position according to the elevation increase and decrease values;

[0040] Place the piers on the leveled ground, set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, mark the intersection of the longitudinal axis and the transverse axis on the upper surface of the piers according to the drawings, and check whether the elevation of the piers meets the error requirements;

[0041] If the requirements are met, the cushion will be inspected. After the inspection is qualified, the position line will be clearly marked and well protected, and then the second large PAU module will be folded and placed.

[0042] As a preferred embodiment of the present invention, when the second large PAU module is folded and placed, it includes:

[0043] Use SPMT to transport the second large PAU module to the site, and place the second large PAU module in place according to the position line of qualified inspection;

[0044] During the placement process, check the deviation between the center line of the four-corner base support of the second large module and the position line of the pier, and adjust until the center line of the four-corner base support coincides with the position line of the pier, and measure the left and right data of the coincidence line to determine whether they are consistent;

[0045] If they are consistent, the second large PAU module is positioned according to the positioning reference line and the closing alignment line, and stations are set according to the central reference points at both ends of the first large PAU module and the second large PAU module to measure the horizontal orthogonal reference line spacing, the closing mouth reference center line deviation and the closing mouth column position coordinates, and measure the data of the closing mouth position base and the four corner bases of the second large PAU module;

[0046] A comprehensive analysis is performed on the measured data to determine whether the requirements are met. If so, the second large PAU module is closed and placed.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) In the prior art, when measuring a large PAU module, there are many control points, the measurement time is long, and the manpower and time cost is high. However, the present invention prepares the control points in advance and can achieve the ideal state by measuring very few control points, thereby effectively saving time and manpower costs;

[0049] (2) In the prior art, errors accumulate each time the station is changed, resulting in inaccurate measurement data. Compared with the prior art, the present invention requires fewer station changes, thereby effectively reducing instrument errors and making the measurement data more accurate.

[0050] (3) In the prior art, the utilization rate of SPMT is high during the measurement and assembly process, which greatly increases the cost. The method provided by the present invention can effectively reduce the utilization rate of SPMT, thereby reducing the cost.

[0051] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 - is a schematic diagram of a square plate covering and spot welding fixation according to an embodiment of the present invention;

[0053] Figure 2- is a schematic diagram of placing cushions in the final assembly step of an embodiment of the present invention;

[0054] Figure 3 - is a schematic diagram of the first piece placement in the final assembly step of an embodiment of the present invention;

[0055] Figure 4 - is a schematic diagram of measurement and adjustment in the final assembly step of an embodiment of the present invention;

[0056] Figure 5 - is a schematic diagram of the two modules being joined together in the final assembly step of an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The method for prefabrication, measurement and assembly of a large PAU module provided by the present invention comprises a prefabrication step S1 and an assembly step S2;

[0058] The prefabrication step S1 comprises:

[0059] Step S11: Analyze the connection combination characteristics of each node according to the drawings of the large PAU module and formulate a feasible size control plan;

[0060] Step S12: After laying out the ground sample according to the size control plan, the cushions are arranged according to the cushion layout diagram;

[0061] Step S13: After the components are installed and self-inspection and inspection are completed, welding operations are performed and horizontal and coordinate data are measured and recorded;

[0062] Step S14: adjusting the error and correcting the fitting orthogonal reference point according to the horizontal and coordinate data, and marking the corrected fitting orthogonal reference point to complete the prefabrication step;

[0063] The final assembly step S2 includes a preliminary preparation step S21 and a piece placement step S22;

[0064] The preliminary preparation step S21 includes: the piers to be placed are steel piers or cement piers, and a steel pier placement step or a cement pier placement step is performed;

[0065] The sheet placement step S22 includes: using the first sheet step to complete the placement of the first large PAU module, and completing the closing placement of the second large PAU module through the placement and positioning steps of the closing module.

[0066] In the above step S12, when laying out the ground sample according to the size control scheme, it includes:

[0067] According to the size control plan, determine the orthogonal reference line, clearly mark the orthogonal reference line, and set up the station based on the orthogonal reference line;

[0068] Based on the welding shrinkage value and the temperature correction value, the vertical and horizontal axes are offset in sequence.

[0069] In the above step S12, when the cushions are arranged according to the cushion layout diagram, it includes:

[0070] Use measuring instruments to control the horizontal error of the top surface of the pier within ±3mm, use positioning instruments to lead the ground reference line to the top surface of the pier, draw vertical and horizontal axes on the top surface of the pier in sequence according to the ground reference line, and after clearly marking the vertical and horizontal axes, conduct pier inspection.

[0071] In the above step S13, when installing the component, it includes:

[0072] First install the vertical and horizontal members close to the ground reference line and use them as reference members;

[0073] Taking the reference component as the reference, the components on both sides are installed respectively, and at the same time, it is determined whether the span of the components on both sides exceeds the span threshold. If so, piers are added under the components on both sides to control the welding errors of the components on both sides.

[0074] In the above step S14, when adjusting the error and correcting the fitting orthogonal reference point, it includes:

[0075] First, measure the horizontal data of each key node, and determine whether there is any deviation at each key node based on the horizontal data. If so, adjust the deviation to the qualified range;

[0076] Use acquisition instruments to collect coordinate data of each key node, and use analysis software to comprehensively analyze the coordinate data and correct the fitting orthogonal reference points.

[0077] Specifically, the purpose of the prefabrication step S1 is to ensure the qualification and accuracy of the post-welding data. The specific process of the prefabrication step S1 is as follows:

[0078] (1) Prefabrication in the workshop, fully familiar with the drawings, analyze the characteristics of each node connection combination, plan in advance, and formulate a feasible size control plan;

[0079] (2) Carry out the layout of the ground sample according to the formulated size control plan. The orthogonal reference line is determined first, and the station is set according to the orthogonal reference line. The vertical and horizontal axes are made in sequence using the offset function (taking into account the welding shrinkage and temperature correction value). The reference line should be permanently and clearly marked for later use;

[0080] (3) Arrange the piers according to the pier layout drawing, use a level to measure the level of the top surface of the pier (+ / -3mm), use a line tracer or total station to draw the ground reference line to the top of the pier, draw the vertical and horizontal axes in sequence according to the reference line, mark them clearly, and conduct pier inspection;

[0081] (4) Install the components first (the longitudinal and transverse components closest to the reference line, and consider adding the anti-deformation value). Based on the reference component, start installing the components on both sides (adding piers is required for larger spans) to ensure that the data after welding can meet the tolerance requirements.

[0082] (5) After all components are installed and self-inspection is passed, they will be reported for inspection;

[0083] (6) After the inspection is qualified, the welder is arranged to carry out welding work according to the WPS requirements and dimensional control plan;

[0084] (7) Deformation monitoring should be carried out regularly during the welding process, and the welding sequence or rigidity limit should be adjusted according to the measured data to ensure that the deformation is controllable;

[0085] (8) After welding, measure the level of each key node first. If it exceeds the tolerance, make adjustments (fire correction). If it is qualified, record the data;

[0086] (9) Use a total station to collect the coordinates of each key node (including orthogonal reference points), use CAD to comprehensively analyze each key dimension, and correct the fitting orthogonal reference points;

[0087] (10) According to the corrected fitting orthogonal reference point, re-mark the module permanently and clearly, and use a square plate to cover and spot weld it, such as Figure 1 As shown;

[0088] (11) If the data is qualified, post-weld inspection will be carried out.

[0089] In the above step S21, the step of placing the cement pouring pad includes:

[0090] According to the pier layout drawing, mark the axis of the ground sample on the ground of the proposed construction area;

[0091] Set an elevation reference point, measure the ground height of each pier arrangement point, and obtain the elevation increase or decrease value of each pier arrangement point based on the elevation reference point and the ground height;

[0092] Determine whether the elevation increase or decrease value of each pier arrangement point exceeds the elevation threshold. If so, level the pier arrangement points that exceed the threshold to control the elevation increase or decrease value within the elevation threshold.

[0093] Lay steel plates at each pier arrangement point and align the center line of the steel plates with the axis of the ground sample;

[0094] According to the axis size of the cement pouring pier, make positioning marks on the steel plate and place the cement pouring pier according to the positioning marks;

[0095] Measure the elevation of the upper surface of the cement pouring pad after placement, and control the elevation error by adding or removing pads;

[0096] Determine the support positions at both ends of the long axis of the large PAU module and set the reference line, extend the reference line to the top of the pad, and complete the cement pouring pad placement steps.

[0097] In the above step S21, the step of placing the steel pier includes:

[0098] After the elevation increase or decrease of each pier arrangement point is controlled within the elevation threshold, formwork is carried out according to the axis position of the ground sample, and each cushion layer is obtained by pouring concrete, and the horizontal error of the upper surface of each cushion layer is controlled within ±3mm;

[0099] Place the steel piers according to the support layout diagram, determine the support positions at both ends of the long axis of the large PAU module and set the reference line, mark the intersection of the vertical and horizontal axes on the top of the steel piers, and measure the elevation error and horizontal error of the upper surface of the steel piers after placement. If the errors meet the requirements, the steel piers will be inspected and the steel pier placement steps will be completed.

[0100] In the above step S22, when the first PAU module is placed using the first piece step, it includes:

[0101] Use SPMT to transport the first large PAU module to the site, and place the first large PAU module in place according to the qualified position line and with reference to the welding data recorded in the prefabrication step, until the center lines of the four corner bases of the first large PAU module coincide with the center lines of the piers;

[0102] Use the angle code and prism to measure the level of the four-corner base. After adjusting to a qualified level, collect the four-corner coordinates of each four-corner base, the level value of the four-corner base deck and the span of the four-corner base columns, and analyze them;

[0103] According to the average horizontal value of the four-corner base deck, the settlement control point is made. According to the four-corner coordinates of the four-corner base and the span of the four-corner base columns, the positioning reference line and the closing line are drawn, and fixed marks are made on the four-corner base deck surface to complete the first step.

[0104] In the above step S22, when the second large PAU module is placed and positioned by placing and positioning the closing module, the following steps are included:

[0105] Set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, draw vertical and horizontal axes on the ground according to the construction pier layout diagram, and mark the pier positions;

[0106] Measure the ground height at the pier, obtain the elevation increase or decrease of the ground at each location based on the average elevation of the first large PAU module deck, and level the ground at each location based on the elevation increase or decrease;

[0107] Place the piers on the leveled ground, set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, mark the intersection of the vertical axis and the horizontal axis on the upper surface of the piers according to the drawings, and check whether the elevation of the piers meets the error requirements;

[0108] If it meets the requirements, the cushion will be inspected. After passing the inspection, the position line will be clearly marked and protected, and then the second large PAU module will be folded and placed.

[0109] Furthermore, when the second large PAU module is folded and placed, the steps include:

[0110] Use SPMT to transport the second large PAU module to the site and place it in place according to the position line that has passed the inspection;

[0111] During the placement process, check the deviation between the center line of the four-corner base support and the pier position line of the second large module, and adjust until the center line of the four-corner base support coincides with the pier position line, and measure the left and right data of the matching line to determine whether they are consistent;

[0112] If they are consistent, the second large PAU module is positioned according to the positioning reference line and the closing alignment line, and stations are set up according to the central reference points at both ends of the first large PAU module and the second large PAU module to measure the horizontal orthogonal reference line spacing, the closing mouth reference center line deviation and the closing mouth column position coordinates, and measure the data of the closing mouth position base and the four corner bases of the second large PAU module;

[0113] A comprehensive analysis is performed on the measured data to determine whether the requirements are met. If so, the second large PAU module is closed and placed.

[0114] Specifically, the specific process of the final assembly step S2 is as follows:

[0115] Preliminary preparation

[0116] like Figure 2 As shown in the figure, the placement of the piers, the piers are divided into two forms: steel square piers and cement cast piers.

[0117] Placement of cement pouring pads:

[0118] (1) In the proposed construction area, according to the pier layout drawing, use a ruler or total station to mark the axis on the ground and draw the ground sample line with lime;

[0119] (2) Use a total station or level to measure the ground height of each pier arrangement point and calculate the increase or decrease in the elevation of each ground position;

[0120] (3) Set a height reference point, and use tools to shovel away or raise the ground with sand and stones for any area below or above the reference point, and compact it until it is close to the height reference point;

[0121] (4) Lay a 50 mm thick steel plate at the leveled pad position, align the center line of the steel plate with the axis of the ground sample marked on the ground, and use a level to level the 50 mm thick steel plate to ensure stable load bearing;

[0122] (5) Use a ruler to check the axis dimensions of the pier, and mark the position of the pier on the thick steel plate and draw a cross positioning line;

[0123] (6) Place the piers according to the positioning marks on the steel plate, check the offset of the top of the piers relative to the axis, and slightly adjust the cement piers so that their horizontal offset is within + / -20 mm;

[0124] (7) Use a level to measure the elevation of the upper surface of the pier, and adjust the elevation of the upper surface by adding or removing pads to control the error within ±3mm;

[0125] (8) Use a total station to determine the support positions at both ends of the module's long axis, set the baseline, and use the total station's lateral and longitudinal offset functions to extend the axis to the top of the pad.

[0126] Placement of steel piers:

[0127] (1) Refer to the first 1 / 2 / 3 steps of placing the concrete pad;

[0128] (2) Formwork is carried out according to the position of the ground sample line, concrete is poured, and the level of the upper surface of each cushion layer is controlled within a tolerance of + / -3mm;

[0129] (3) Place the steel piers according to the support layout diagram;

[0130] (4) Use the total station to measure the reference points at both ends of the long axis of the module, set the reference line, use the total station's lateral and longitudinal offset functions to mark the intersection of the longitudinal and transverse axes on the top of the pier, and check that the support surface elevation meets the requirements of + / -3mm, D. The horizontal direction meets + / -6mm;

[0131] (5) For the piers that meet the project control requirements, inspection shall be carried out according to the procedures. If the inspection is qualified, the permanent axis shall be marked and protected for later use. The inspection shall be close to the final assembly time and not too far away to avoid the movement of the piers / pads.

[0132] The sheet placement steps include the first sheet step and the placement and positioning steps of the fitting modules.

[0133] like Figure 3 As shown, the first step includes:

[0134] (1) The modules are transported to the site using SPMT, and are placed in place according to the qualified position line and the prefabrication welding data;

[0135] (2) During the placement process, check whether the center line of the four corner bases coincides with the center line of the pier. If not, fine-tune until the center line of the base coincides with the position line of the pier and align it (the adjustable accuracy of SPMT is 2 mm);

[0136] (3) After the module is in place, use the angle code and prism to measure the base level and make adjustments at the same time, such as Figure 4 As shown;

[0137] (4) The base is adjusted horizontally and qualified, and the coordinates of the four corners of each base, deck level, and column span are collected using a total station;

[0138] (5) After comprehensive analysis of various data, if qualified, the settlement control points are made according to the average level of the base, the positioning reference line and the closing line are drawn according to the coordinates of the four corners of the base and the span of the columns, and the sample punch is used to make fixed marks on the deck surface;

[0139] (6) The first piece of work is completed and the module is inspected in place.

[0140] Steps for placing and positioning the fitting module:

[0141] (1) Use a total station to set up a station based on the positioning reference line of film A (the first large PAU module), draw vertical and horizontal axes on the ground according to the construction pier layout drawing, use white lime to mark the pier position, use a level to measure the ground height at the pier, calculate the increase or decrease of the ground elevation at each position based on the average elevation of the bottom plate of film A, and pad or dig soil and stone (or concrete) until it is close to the elevation reference;

[0142] (2) After the steel pier is installed, use the total station to set up the station according to the A-sheet positioning reference line, and mark the intersection of the longitudinal axis and the transverse axis on the upper surface of the pier according to the drawing. At the same time, check whether the pier elevation meets the requirement of + / -3mm and the horizontal span is consistent with the drawing;

[0143] (3) The piers that meet the project tolerance requirements shall be inspected according to the procedures. After passing the inspection, the axis shall be clearly marked and protected for later use;

[0144] (4) Use SPMT to place the modules in place according to the qualified position line;

[0145] (5) During the process, check the deviation between the center line of the bottom support of the four corners of the module and the corresponding position line, and make fine adjustments to make the center line of the module base coincide with the position line of the pier, align the center reference line of the deck, and measure the alignment line data on the left and right to see if they are consistent;

[0146] (6) Figure 5 As shown, after the closing pieces are in place according to the position lines and the matching lines, a total station is used to set up stations according to the central reference points at both ends of the A / B pieces to measure the spacing between the horizontal orthogonal reference lines, the deviation of the closing mouth reference center line, and the position coordinates of the closing mouth columns;

[0147] (7) Measure the base at the closing position and the base data at the four corners of the module, conduct a comprehensive analysis, and if qualified, the positioning of piece B (the second largest PAU module) is completed;

[0148] (8) Collect all the data required for supplementary testing and issue a report.

[0149] Compared with the prior art, the present invention has the following beneficial effects:

[0150] (1) In the prior art, when measuring a large PAU module, there are many control points, the measurement time is long, and the manpower and time cost is high. However, the present invention prepares the control points in advance and can achieve the ideal state by measuring very few control points, thereby effectively saving time and manpower costs;

[0151] (2) In the prior art, errors accumulate each time the station is changed, resulting in inaccurate measurement data. Compared with the prior art, the present invention requires fewer station changes, thereby effectively reducing instrument errors and making the measurement data more accurate.

[0152] (3) In the prior art, the utilization rate of SPMT is high during the measurement and assembly process, which greatly increases the cost. The method provided by the present invention can effectively reduce the utilization rate of SPMT, thereby reducing the cost.

[0153] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for prefabrication, measurement and assembly of large PAU modules. It is characterized in that It includes prefabrication steps and final assembly steps; The prefabrication step includes: analyzing the connection combination characteristics of each node according to the drawing of the large PAU module, and formulating a feasible size control plan; after laying out the ground sample according to the size control plan, arranging the piers according to the pier layout diagram; after installing the components and completing the self-inspection and inspection, performing welding operations and measuring and recording the horizontal and coordinate data; according to the horizontal and coordinate data, adjusting the error and correcting the fitting orthogonal reference point, and marking the corrected fitting orthogonal reference point to complete the prefabrication step; The final assembly step includes a preliminary preparation step and a piece placement step; The preliminary preparation step includes: placing the piers as required, which are steel piers or cement piers, and performing the steel pier placement step or the cement pier placement step; The sheet placement step includes: using the first sheet step to complete the placement of the first large PAU module, and completing the closing placement of the second large PAU module through the placement and positioning steps of the closing module.

2. The method for prefabrication, measurement and assembly of a large PAU module according to claim 1, It is characterized in that When laying out the ground sample according to the size control plan, it includes: According to the size control scheme, an orthogonal reference line is determined, the orthogonal reference line is clearly marked, and a station is set based on the orthogonal reference line; Based on the welding shrinkage value and the temperature correction value, the vertical and horizontal axes are offset in sequence.

3. The method for prefabrication, measurement and assembly of a large PAU module according to claim 1, It is characterized in that When laying out the piers according to the pier layout drawing, it includes: Use measuring instruments to control the horizontal error of the top surface of the pier within ±3mm, use positioning instruments to lead the ground reference line to the top surface of the pier, draw vertical and horizontal axes on the top surface of the pier in sequence according to the ground reference line, and after clearly marking the vertical and horizontal axes, conduct pier inspection.

4. The method for prefabrication, measurement and assembly of a large PAU module according to claim 3, It is characterized in that When installing components, include: First, install the longitudinal and transverse members close to the ground reference line, and use the longitudinal and transverse members as reference members; Taking the reference component as a reference, the components on both sides are installed respectively, and it is determined whether the span of the components on both sides exceeds the span threshold. If so, piers are added under the components on both sides to control the welding errors of the components on both sides.

5. The method for prefabrication, measurement and assembly of a large PAU module according to claim 1, It is characterized in that When adjusting for errors and correcting the fit orthogonal reference points, include: First, measure the horizontal data of each key node, and determine whether each key node has an out-of-tolerance according to the horizontal data. If so, adjust the out-of-tolerance to a qualified range; The coordinate data of each key node is collected using a collection instrument, and the coordinate data is comprehensively analyzed using analysis software to correct the fitting orthogonal reference points.

6. The method for prefabrication, measurement and assembly of a large PAU module according to claim 1, It is characterized in that The steps of placing the cement pouring pad include: According to the pier layout diagram, mark the ground sample axis on the ground of the proposed construction area; Setting an elevation reference point, measuring the ground height of each pier arrangement point, and obtaining the elevation increase or decrease value of each pier arrangement point according to the elevation reference point and the ground height; Determine whether the elevation increase or decrease value of each pier arrangement point exceeds the elevation threshold, and if so, level the pier arrangement points exceeding the threshold to control the elevation increase or decrease value within the elevation threshold; Laying steel plates at the pier arrangement points, and aligning the center line of the steel plates with the axis of the ground sample; According to the axis size of the cement pouring pier, a positioning mark is made on the steel plate, and the cement pouring pier is placed according to the positioning mark; Measuring the elevation of the upper surface of the cement pouring pad after placement, and controlling the error of the elevation by adding or removing pads; Determine the support positions at both ends of the long axis of the large PAU module and set the reference line, extend the reference line to the top of the pad, and complete the cement pouring pad placement step.

7. The method for prefabrication, measurement and assembly of a large PAU module according to claim 6, It is characterized in that The steps of placing the steel pier include: After the elevation increase or decrease value of each cushion arrangement point is controlled within the elevation threshold, formwork is carried out according to the axis position of the ground sample, and concrete is poured to obtain each cushion layer, and the horizontal error of the upper surface of each cushion layer is controlled within ±3mm; Place the steel piers according to the support layout diagram, determine the support positions at both ends of the long axis of the large PAU module and set the reference line, mark the intersection of the longitudinal and transverse axes on the top of the steel piers, and measure the elevation error and horizontal error of the upper surface of the steel piers after placement. If the errors meet the requirements, the steel piers will be inspected and the steel pier placement steps will be completed.

8. The method for prefabrication, measurement and assembly of a large PAU module according to claim 1, It is characterized in that When the first PAU module is placed using the first piece step, it includes: Use SPMT to transport the first large PAU module to the site, and place the first large PAU module in place according to the qualified position line and with reference to the welding data recorded in the prefabrication step, until the center lines of the four corner bases of the first large PAU module coincide with the center lines of the piers; Use the angle code and prism to measure the level of the four corner bases, and after adjusting to a qualified level, collect the four corner coordinates of each of the four corner bases, the level value of the four corner base deck and the span of the four corner base columns, and analyze them; According to the average horizontal value of the four-corner base deck, the settlement control point is made, and the positioning reference line and the closing line are drawn according to the four-corner coordinates of the four-corner base and the span of the four-corner base columns, and fixed marks are made on the four-corner base deck surface to complete the first piece step.

9. The method for prefabrication, measurement and assembly of a large PAU module according to claim 8, It is characterized in that When the second large PAU module is placed and positioned by placing and positioning the closing module, the following steps are included: Set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, draw vertical and horizontal axes on the ground according to the construction pier layout diagram, and mark the pier positions; Measuring the ground height at the pier, obtaining the elevation increase and decrease values ​​of the ground at each position according to the average elevation of the first large PAU module deck, and leveling the ground at each position according to the elevation increase and decrease values; Place the piers on the leveled ground, set up stations according to the positioning reference lines on the four corner bases of the first large PAU module, mark the intersection of the longitudinal axis and the transverse axis on the upper surface of the piers according to the drawings, and check whether the elevation of the piers meets the error requirements; If the requirements are met, the cushion will be inspected. After the inspection is qualified, the position line will be clearly marked and well protected, and then the second large PAU module will be folded and placed.

10. The method for prefabrication, measurement and assembly of a large PAU module according to claim 9, It is characterized in that When the second large PAU module is folded and placed, it includes: Use SPMT to transport the second large PAU module to the site, and place the second large PAU module in place according to the position line of qualified inspection; During the placement process, check the deviation between the center line of the four-corner base support of the second large PAU module and the position line of the pier, and adjust until the center line of the four-corner base support coincides with the position line of the pier, and measure the left and right data of the matching line to determine whether they are consistent; If they are consistent, the second large PAU module is positioned according to the positioning reference line and the closing alignment line, and stations are set according to the central reference points at both ends of the first large PAU module and the second large PAU module to measure the horizontal orthogonal reference line spacing, the closing mouth reference center line deviation and the closing mouth column position coordinates, and measure the data of the closing mouth position base and the four corner bases of the second large PAU module; A comprehensive analysis is performed on the measured data to determine whether the requirements are met. If so, the second large PAU module is closed and placed.

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