T-code positioning plate for large steel roof system and construction method

Abstract

The invention provides a T-code positioning plate and a construction method for a large steel roof system. The T-code positioning plate is adopted. Compared with a self-tapping screw solution, the T-code is fixed by bolts and nuts, which can avoid the problem of fatigue damage in the self-tapping screw solution. At the same time, the bolts and the T-code positioning plate are fixed first, which facilitates the inspection of the construction quality by the supervisor, and makes it easier to find the T-code with poor connection. Compared with the existing bolt solution, the T-code positioning plate is used to pre-fix the bolts, and the T-code positioning plate is checked for straightness at the same time. Finally, the structural feature that the bolt hole of the T-code positioning plate is consistent with the base through hole of the T-code is used to avoid the deviation of the bolt. After laying the waterproof layer, the T-code can be quickly fastened without hammering the bolt, which solves the problem of difficult bolt connection construction, improves the construction efficiency by hundreds of times, and reduces the average installation time of each T-code to about 2 minutes.

Description

Technical Field

[0001] The invention relates to the field of steel structures, in particular to a T-code positioning plate for a standing seam metal roofing system, and also to a construction method for constructing the standing seam metal roofing system by using the T-code positioning plate. Background Art

[0002] Metal roof refers to a roofing form that uses metal plates as roofing materials and combines the structural layer and the waterproof layer into one. There are many types of metal plates, including zinc plates, galvanized plates, aluminum alloy plates, aluminum-magnesium alloy plates, titanium alloy plates, copper plates, stainless steel plates, etc. The thickness is generally 0.4-1.5mm. Metal roofs are divided into vertical lock seam metal systems, classical buckle metal roof systems, flat lock buckle metal roof systems, etc. according to the different ways of connecting the plates. Among them, the vertical lock seam metal roof system is the most widely used.

[0003] The characteristics of the vertical lock-edge metal roof system are large span, low number of layers and large roof area. Therefore, the advantages of using metal roofs are obvious, and it also plays an important role in the development of modern buildings towards comfort, lightness, durability, economy and environmental protection. The main construction steps of this system include: first, connect and fix the T code with the secondary purlin by self-tapping screws, then lay a waterproof, thermal insulation and / or sound insulation layer on the main purlin, and finally, bite the lock edge of the metal roof panel with the top of the T code and then clamp it with wind-resistant clamps.

[0004] Although the wind-uplift resistance of the existing standing seam metal roof system meets the design standards in the laboratory wind tunnel test, investigations have found that the metal roof system may be damaged by strong winds due to insufficient strength of the T-code and the connection between the T-code and the purlin.

[0005] An important reason for the serious discrepancy between wind tunnel tests and actual conditions is that self-tapping screws are used to fix T-codes. For large steel structure roofs that need to fix millions of T-codes on the vertical lock-edge metal system, although self-tapping screws have the advantage of high construction efficiency, they have the following technical defects:

[0006] (1) Self-tapping screws are prone to fatigue damage such as thread slippage, bending, or even breakage under the fatigue load of long-term wind load, resulting in weak points in the roof system;

[0007] (2) During construction, workers may misalign the self-tapping screws or fail to control the force well, which may cause them to be crooked. At the same time, the stem of the self-tapping screw is located within the T-code base and the flange of the purlin, making it difficult to observe directly during construction quality acceptance. Inspection can only be carried out through random sampling, which also leads to weak points in the roof system. Once the point encounters the wind load of the standard upper limit, it is easy to be exposed.

[0008] In order to solve the above defects, in the existing scheme, bolts and nuts are used as fasteners to fix the T code. First, an internal threaded hole is opened on the purlin, and the bolt passes through the internal threaded hole from bottom to top, and is fixed on the purlin by installing the nut to prevent the bolt from falling. After the bolt is fixed, the waterproof, thermal insulation and / or sound insulation layer is laid as a whole, and then the bolt is sleeved through the through hole reserved on the T code, and the nut is tightened to fix it. Finally, the locking edge of the metal roof panel is engaged with the top of the T code and then clamped with a wind-resistant clamp to complete the connection. Through the bolts that pass through the purlin, the construction quality of most T codes can be inspected by direct observation. At the same time, due to the design of high-strength bolts, fatigue damage can be effectively avoided, so that the roof system is not prone to local weak points and being blown away by the wind, thereby ensuring the construction quality.

[0009] However, the above solution has the following technical defects:

[0010] (1) During the drilling process, due to construction errors, the through holes reserved on the T-code cannot be matched with the bolts one by one, that is, some bolts are offset so that they cannot pass through the through holes of the T-code. In particular, the T-code can only be installed on the purlin after the waterproof layer is laid, and the waterproof layer cannot be removed after laying. At this time, it is not possible to adjust by removing the bolts and re-drilling;

[0011] (2) Although a high-precision laser marker was installed on site, each T-code was manually aligned and then installed on the purlin by bolts. Due to the drilling error of the installation part of the entire T-code on the purlin, the T-code was likely to be slightly offset. When the offset errors of multiple T-codes accumulated, the tops of the T-codes in the direction perpendicular to the purlin were no longer in a straight line, resulting in the lock edge of the metal roof being unable to engage with the top of the T-code.

[0012] In order to ensure the construction progress, the construction party can only adopt the following technical solutions for the above situation:

[0013] When the through hole on the T code cannot be fitted onto the bolt, the worker can only hammer the bolt to make it bend so that the bolt can pass through the through hole of the T code; when the top of the T code is not in a straight line and the locking edge of the metal roof cannot be engaged, the worker can only hammer the T code to make the top of the T code in a straight line, or forcibly widen the locking edge of the metal roof to achieve the installation of the metal roof.

[0014] The above technical solution is a helpless choice for the construction party. However, even if the installation of the metal roof is completed, the hammering of a large number of bolts and T-codes, as well as the widening of the lock edge, will have a great adverse effect on the wind resistance of the upright lock edge metal roof system. At the same time, the installation of the T-code is extremely inefficient due to the construction error of the bolts. Compared with the self-tapping screw solution that can install a T-code in a few minutes, the bolt solution may take nearly half a day to complete the installation of a T-code, which greatly delays the construction progress. Summary of the invention

[0015] The first object of the present invention is to provide a T-code positioning plate for a large steel roofing system, which is intended to prevent bolts from being unable to penetrate the T-code through holes and to prevent the upright lock edges from being unable to engage after the T-code is fixed, thereby preventing the installation of the metal roof from being completed.

[0016] In order to achieve the first purpose, the present invention adopts the following technical solution:

[0017] A T-code positioning plate for a large steel roofing system comprises a plate body, characterized in that it also comprises an internal threaded hole opened on the plate body and located at a position corresponding to the through hole on the T-code base, and a cross reference line arranged at the center of the upper end surface of the plate body and used for aligning with the marking line emitted by a laser marker, wherein the cross reference line comprises a longitudinal line and a transverse line, wherein the longitudinal line is consistent with the stretching direction of the metal roof lock edge, and the transverse line is perpendicular to the longitudinal line.

[0018] A second object of the present invention is to provide a construction method for a standing seam metal roofing system, which improves the installation efficiency of T-codes under a bolt scheme by adopting T-code positioning plates.

[0019] In order to achieve the second purpose, the present invention adopts the following technical solution:

[0020] A construction method of a standing seam metal roofing system, characterized in that the T-code positioning plate is used to perform the following steps:

[0021] Step 1: With the help of a laser marker, mark alignment reference lines perpendicular to the secondary purlins at equal intervals along the extension direction of all secondary purlins of the standing seam metal roofing system, then mark drilling points corresponding to the positions of the internal threaded holes on the T-code positioning plate on both sides of each alignment reference line, and drill round holes at the drilling points, wherein the spacing is the distance between the two locking edges of the metal roofing panel;

[0022] Step 2: Install the corrugated steel bottom plate on the web of the main purlin, install the sound insulation cotton on the corrugated steel bottom plate, install the secondary purlin in step 1 on the upper flange of the main purlin, align the internal threaded hole on the T-code positioning plate with the circular hole, insert the bolt into the circular hole from the bottom of the upper flange of the secondary purlin and screw it into the internal threaded hole, and then the rod of the bolt vertically passes through the T-code positioning plate to fix the T-code positioning plate;

[0023] Step three, check the longitudinal line of the cross reference line on the T-code positioning plate. For the T-code positioning plate whose longitudinal line is not collinear with the corresponding alignment reference straight line, loosen the bolts and fine-tune the T-code positioning plate so that the longitudinal line of the T-code positioning plate is collinear with the alignment reference straight line, tighten the bolts, and then lay the thermal insulation rock wool;

[0024] Step 4. After laying the flexible waterproof layer, pass the bolts through the through holes of the T-code base to place the T-code, then screw the nuts onto the bolts. After all the T-codes are tightened, engage the locking edge of the metal roof panel with the top of the T-code, and then use wind-resistant clips to clamp the locking edge.

[0025] The above technical solution can be improved as follows:

[0026] In the step 1, when the T-code positioning plate is placed on the surface of the secondary purlin, the longitudinal line is made to coincide with the laser line marking the alignment reference straight line, and then a marking pen is used to pass through the internal threaded hole to mark the drilling point on the surface of the secondary purlin.

[0027] In the step one, with the help of the laser line emitted by the laser marker, cross positioning lines corresponding to the positions of the internal threaded holes on the T-code positioning plate are marked on both sides of each alignment reference line. The intersection of the cross positioning lines corresponds to the center of the internal threaded hole, and the intersection is the drilling point.

[0028] In order to achieve the second purpose, the present invention can also adopt the following technical solutions:

[0029] A construction method of a standing seam metal roofing system, characterized in that the T-code positioning plate is used to perform the following steps:

[0030] Step 1: A group of oblong holes are opened at equal intervals on the upper flange of the secondary purlin, each group of oblong holes includes a pair of transverse oblong holes and a pair of longitudinal oblong holes, the extension direction of the transverse oblong holes is parallel to the extension direction of the secondary purlin, and the extension direction of the longitudinal oblong holes is perpendicular to the extension direction of the secondary purlin, the hole positions in each group of oblong holes correspond to the internal threaded holes on the T-code positioning plate, and the spacing is the distance between the two locking edges of the metal roof panel;

[0031] Step 2: Install the corrugated steel bottom plate on the web of the main purlin, install the sound insulation cotton on the corrugated steel bottom plate, install the secondary purlin in step 1 on the upper flange of the main purlin, place the T-code positioning plate on the secondary purlin, and make the internal threaded holes of the T-code positioning plate correspond to the oblong holes one by one, and insert the bolts from the bottom of the upper flange of the secondary purlin into the oblong holes and screw them into the internal threaded holes, so that the rods of the bolts pass vertically upwards through the T-code positioning plate;

[0032] Step 3: Use the laser line emitted by the laser marker to check the longitudinal line of the cross reference line on each T-code positioning plate. For the T-code positioning plate whose longitudinal line is not collinear with the corresponding laser line, fine-tune the T-code positioning plate so that the longitudinal line of the T-code positioning plate is collinear with the corresponding laser line, and spot weld the T-code positioning plate to fix it on the secondary purlin. The distance between each two laser lines is the distance between the two lock edges of the metal roof panel.

[0033] Step 4. After laying the thermal insulation rock wool and flexible waterproof layer in sequence, pass the bolts through the through holes of the T-code base to place the T-code, then screw the nuts onto the bolts. After all the T-codes are tightened, engage the locking edge of the metal roof panel with the top of the T-code and then use wind-resistant clips to clamp the locking edge.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) Compared with the self-tapping screw solution, the T-code is fixed by bolts and nuts, which can avoid the problem of fatigue damage in the self-tapping screw solution. At the same time, by first fixing the bolts and the T-code positioning plate, it is convenient for the supervisor to inspect the construction quality and it is easier to find T-codes with poor connections;

[0036] (2) By first completing the straightness check of the T-code positioning plate and then laying the waterproof layer, since the position of the internal thread hole of the T-code positioning plate is consistent with the position of the through hole of the T-code base, the top of the T-code must be on the same straight line after the T-code is installed, avoiding the inability to adjust the position of the deviated T-code due to the non-removable waterproof layer that has been laid;

[0037] (3) Compared with the existing bolt solution, the bolts are pre-fixed by using the T-code positioning plate, and the T-code positioning plate is linearly checked at the same time. Finally, the internal threaded hole of the T-code positioning plate is consistent with the base through hole of the T-code, which avoids the deviation of the bolts. After laying the waterproof layer, the T-code can be quickly fastened without hammering the bolts, solving the problem of difficult bolt connection construction. The average installation time of each T-code can be reduced to about 2 minutes, which improves the construction efficiency by hundreds of times.

[0038] (4) The present invention can greatly improve the connection strength between the T-code and the secondary purlin by adding a T-code positioning plate, while greatly improving the construction efficiency with a low-cost method, reducing a large amount of human resource consumption, greatly shortening the construction period, and bringing great economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the T-code positioning plate of the present invention;

[0040] Figure 2 This is a three-dimensional diagram after drilling a round hole at the installation position of the T-code positioning plate on the secondary purlin;

[0041] Figure 3 A schematic diagram of an implementation method for calibrating drilling points on secondary purlins;

[0042] Figure 4 A schematic diagram of another implementation method for calibrating the drilling points on the secondary purlin;

[0043] Figure 5 A perspective view of a standing seam metal roof system when the corrugated steel base plate is installed in the middle of the main purlin web;

[0044] Figure 6 ; A three-dimensional diagram of the vertical lock seam metal roof system when using the T-code positioning plate for straightness verification

[0045] Figure 7 A perspective view of the standing seam metal roof system after installation;

[0046] Figure 8 A perspective view of the standing seam metal roof system after installation of the flexible waterproofing layer;

[0047] Fig. 9 It is an exploded view of the installation structure of the T-code, T-code positioning plate and secondary purlin of the present invention;

[0048] Fig.10 A perspective view of the standing seam metal roof system after installing the T-code;

[0049] Fig.11 A perspective view of the standing seam metal roof system after installation;

[0050] Fig.12 A three-dimensional view of the secondary purlin after drilling oblong holes at the locations where the T-code positioning plates are to be installed;

[0051] Among them: 1. T-code positioning plate; 11. Internal threaded hole; 12. Cross reference line; 121. Vertical line; 122. Horizontal line; 2. T-code; 21. T-code top; 22. T-code base; 23. Through hole; 3. Bolt; 4. Nut; 5. Secondary purlin; 51. Round hole; 52. Long round hole; 521. Horizontal long round hole; 522. Longitudinal long round hole; 53. Alignment reference line; 54. Cross positioning line; 55. Black spot; 6. Main purlin; 7. Corrugated steel base plate; 8. Sound insulation cotton; 9. Thermal insulation rock wool; 10. Flexible waterproof layer; 20. Metal roof panel; 30. Wind-resistant clip. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0053] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] The invention provides a T-code positioning plate for a large steel roofing system.

[0055] like Figure 1 As shown, the T-code positioning plate 1 includes a plate body, 3 bolt holes and a cross reference line 12. The plate body is provided with 3 bolt holes, and the positions thereof correspond to the through holes 23 on the T-code base 22. The cross reference line 12 is located at the center of the upper end surface of the plate body, and is used for alignment with the marking line emitted by the laser marking device, and is composed of a longitudinal line 121 and a transverse line 122, wherein the longitudinal line 121 is consistent with the extension direction of the metal roof lock edge, and the transverse line 122 is perpendicular to the longitudinal line 121.

[0056] The invention also provides a construction method of the standing seam metal roofing system.

[0057] Embodiment 1

[0058] Step 1, such as Figure 2 As shown, with the help of a laser marker, alignment reference lines 53 perpendicular to the secondary purlins 5 are marked at equal intervals on the surfaces of all secondary purlins 5 of the standing seam metal roofing system along their extension direction. The interval is the distance between the two locking edges of the metal roofing panel 20. Drilling points corresponding to the positions of the internal threaded holes 11 on the T-code positioning plate 1 are then marked on both sides of each of the alignment reference lines 53, and circular holes 51 are drilled at the drilling points.

[0059] Alternatively, if Figure 3 As shown, when the T-code positioning plate 1 is placed on the surface of the secondary purlin 5, the longitudinal line 121 is made to coincide with the laser line marking the alignment reference straight line 53. At this time, the projection line of the longitudinal line 121 on the surface of the secondary purlin 5 coincides with the alignment reference straight line 53. Then, a marking pen is used to pass through the internal threaded hole 11 to mark a black dot 55 on the surface of the secondary purlin 5. The black dot 55 is the drilling point.

[0060] Alternatively, if Figure 4 As shown, with the help of the laser line emitted by the laser marker, cross positioning lines 54 corresponding to the positions of the internal threaded holes 11 on the T-code positioning plate 1 are marked on both sides of each alignment reference line 53, and the intersection of the cross positioning lines 54 corresponds to the center of the internal threaded hole 11, and the intersection is the drilling point.

[0061] Step 2, such as Figure 5 As shown, a corrugated steel bottom plate 7 is installed on the web of the main purlin 6, and a sound insulation cotton 8 is installed on the corrugated steel bottom plate 7. Figure 6 As shown, the secondary purlin 5 in step one is installed on the upper flange of the main purlin 6, the internal threaded hole 11 on the T-code positioning plate 1 is aligned with the circular hole 51, and the bolt 3 is inserted into the circular hole 51 from the bottom of the upper flange of the secondary purlin 5 and screwed into the internal threaded hole 11, and the rod of the bolt 3 vertically passes through the T-code positioning plate 1 upward to fix the T-code positioning plate 1.

[0062] Step three, such as Figure 7 As shown, the longitudinal line 121 of the cross reference line 12 on the T code positioning plate 1 is checked. For the T code positioning plate 1 whose longitudinal line 121 is not collinear with the corresponding alignment reference straight line 53, the T code positioning plate 1 is fine-tuned after loosening the bolt 3 so that the longitudinal line 121 of the T code positioning plate 1 is collinear with the alignment reference straight line 53, and then the bolt 3 is tightened, and then as shown in FIG. Figure 8 As shown, thermal insulation rock wool 9 is laid.

[0063] Specifically, after loosening the bolt 3, due to the gap between the bolt 3 and the circular hole 51, the existence of this gap allows the T-code positioning plate 1 to be slightly offset for fine-tuning. Since the drilling hole is calibrated with high precision in advance with the help of a laser marker in step one, the offset of the T-code 2 is caused by the process of fixing the T-code positioning plate 1. By fine-tuning the T-code positioning plate 1 after loosening the bolt 3, the cross reference line 12 on the T-code positioning plate 1 can be accurately calibrated.

[0064] Step 4: Figure 8 After laying the flexible waterproof layer 10, as shown in Figures 9 and 10 As shown, the bolt 3 is passed through the through hole 23 of the T code base 22 to place the T code 2, and then the nut 4 is screwed onto the bolt 3. After all the T codes 2 are tightened, as shown in FIG. Fig.11 As shown, the locking edge of the metal roof panel 20 is engaged with the top of the T code 2, and then the locking edge is clamped with a wind-resistant clip 30.

[0065] Embodiment 2

[0066] Step 1, such as Fig.12 As shown, a group of oblong holes 52 are evenly spaced on the upper flange of the secondary purlin 5, and the spacing is the distance between the two locking edges of the metal roof panel 20. Each group of oblong holes 52 includes a pair of transverse oblong holes 521 and a pair of longitudinal oblong holes 522. The extension direction of the transverse oblong holes 521 is parallel to the extension direction of the secondary purlin 5, and the extension direction of the longitudinal oblong holes 522 is perpendicular to the extension direction of the secondary purlin 5. The hole positions in each group of oblong holes 52 correspond to the internal threaded holes 11 on the T-code positioning plate 1.

[0067] Step 2, such as Figure 5 As shown, a corrugated steel bottom plate 7 is installed on the web of the main purlin 6, and a sound insulation cotton 8 is installed on the corrugated steel bottom plate 7. Figure 6 As shown, the secondary purlin 5 in step one is installed on the upper flange of the main purlin 6, the T-code positioning plate 1 is placed on the secondary purlin 5, and the internal threaded hole 11 of the T-code positioning plate 1 is made to correspond one to one with the oblong hole 52, and the bolt 3 is inserted into the oblong hole 52 from the bottom of the upper flange of the secondary purlin 5 and screwed into the internal threaded hole 11, and the rod of the bolt 3 is vertically passed through the T-code positioning plate 1.

[0068] Step three, such as Figure 6 As shown, the laser line emitted by the laser marker is used to check the longitudinal line 121 of the cross reference line 12 on each T-code positioning plate 1. For the T-code positioning plate 1 whose longitudinal line 121 is not collinear with the corresponding laser line, the T-code positioning plate 1 is fine-tuned so that the longitudinal line 121 of the T-code positioning plate 1 is collinear with the corresponding laser line, and the T-code positioning plate 1 is spot-welded to be fixed on the secondary purlin 5, and the distance between each two of the laser lines is the distance between the two lock edges of the metal roof panel 20.

[0069] Specifically, when the T-code positioning plate 1 is fine-tuned, its lateral offset is achieved through the lateral oblong hole 521 , and its longitudinal offset is achieved through the longitudinal oblong hole 522 .

[0070] Step 4: Figures 7 and 8 As shown, after laying the thermal insulation rock wool 9 and the flexible waterproof layer 10 in sequence, as shown in FIG. Figures 9 and 10 As shown, the bolt 3 is passed through the through hole 23 of the T code base 22 to place the T code 2, and then the nut 4 is screwed onto the bolt 3. After all the T codes 2 are tightened, as shown in FIG. Fig.11 As shown, the locking edge of the metal roof panel 20 is engaged with the top 21 of the T-code and then the locking edge is clamped with a wind-resistant clip 30 .

[0071] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A construction method for a standing seam metal roofing system, characterized in that The following steps are performed using a T-code positioning plate (1) for a large steel roof system, wherein the T-code positioning plate (1) comprises a plate body, an internal threaded hole (11) provided on the plate body and located at a position corresponding to a through hole (23) on the T-code base (22), and a cross reference line (12) provided at the center of the upper end surface of the plate body and used for aligning with a marking line emitted by a laser marking device, wherein the cross reference line (12) comprises a longitudinal line (121) and a transverse line (122), wherein the longitudinal line (121) is consistent with the extension direction of the metal roof lock edge, and the transverse line (122) is perpendicular to the longitudinal line (121): Step 1: With the aid of a laser marker, mark alignment reference lines (53) perpendicular to the secondary purlins (5) at equal intervals along the extension direction of the surfaces of all secondary purlins (5) of the standing seam metal roofing system, then mark drilling points corresponding to the positions of the internal threaded holes (11) on the T-code positioning plate (1) on both sides of each alignment reference line (53), and drill circular holes (51) at the drilling points, wherein the spacing is the distance between the two locking edges of the metal roofing panel (20); Step 2: Install a corrugated steel base plate (7) on the web of the main purlin (6), install sound insulation cotton (8) on the corrugated steel base plate (7), install the secondary purlin (5) in step 1 on the upper flange of the main purlin (6), align the internal threaded hole (11) on the T-code positioning plate (1) with the circular hole (51), insert the bolt (3) into the circular hole (51) from the bottom of the upper flange of the secondary purlin (5) and screw it into the internal threaded hole (11), and then the rod of the bolt (3) vertically passes through the T-code positioning plate (1) to fix the T-code positioning plate (1); Step 3: Check the longitudinal line (121) of the cross reference line (12) on the T-code positioning plate (1). For the T-code positioning plate (1) whose longitudinal line (121) is not collinear with the corresponding alignment reference straight line (53), loosen the bolt (3) and fine-tune the T-code positioning plate (1) so that the longitudinal line (121) of the T-code positioning plate (1) is collinear with the alignment reference straight line (53), then tighten the bolt (3), and then lay the thermal insulation rock wool (9); Step 4, after laying the flexible waterproof layer (10), the bolt (3) is passed through the through hole (23) of the T-code base (22) to place the T-code (2), and then the nut (4) is screwed onto the bolt (3). After all the T-codes (2) are tightened, the locking edge of the metal roof panel (20) is engaged with the top of the T-code (2), and then the locking edge is clamped with a windproof clip (30).

2. The construction method of the standing seam metal roofing system according to claim 1, characterized in that: In the step 1, when the T-code positioning plate (1) is placed on the surface of the secondary purlin (5), the longitudinal line (121) is made to coincide with the laser line marking the alignment reference straight line (53), and then a marking pen is used to pass through the internal threaded hole (11) to mark the drilling point on the surface of the secondary purlin (5).

3. The construction method of the standing seam metal roofing system according to claim 1, characterized in that: In the step 1, cross positioning lines (54) corresponding to the positions of the internal threaded holes (11) on the T-code positioning plate (1) are marked on both sides of each alignment reference straight line (53) by means of laser lines emitted by a laser marker, and the intersection of the cross positioning lines (54) corresponds to the center of the internal threaded hole (11), and the intersection is the drilling point.

4. A construction method for a standing seam metal roofing system, characterized in that The following steps are performed using a T-code positioning plate (1) for a large steel roof system, wherein the T-code positioning plate (1) comprises a plate body, an internal threaded hole (11) provided on the plate body and located at a position corresponding to a through hole (23) on the T-code base (22), and a cross reference line (12) provided at the center of the upper end surface of the plate body and used for aligning with a marking line emitted by a laser marking device, wherein the cross reference line (12) comprises a longitudinal line (121) and a transverse line (122), wherein the longitudinal line (121) is consistent with the extension direction of the metal roof lock edge, and the transverse line (122) is perpendicular to the longitudinal line (121): Step 1: A group of oblong holes (52) are formed at equal intervals on the upper flange of the secondary purlin (5), each group of the oblong holes (52) includes a pair of transverse oblong holes (521) and a pair of longitudinal oblong holes (522), the extension direction of the transverse oblong holes (521) is parallel to the extension direction of the secondary purlin (5), and the extension direction of the longitudinal oblong holes (522) is perpendicular to the extension direction of the secondary purlin (5), the hole positions in each group of oblong holes (52) correspond to the internal threaded holes (11) on the T-code positioning plate (1), and the spacing is the distance between two locking edges of the metal roof panel (20); Step 2: Install a corrugated steel base plate (7) on the web of the main purlin (6), install sound insulation cotton (8) on the corrugated steel base plate (7), install the secondary purlin (5) in step 1 on the upper flange of the main purlin (6), place the T-code positioning plate (1) on the secondary purlin (5), and make the internal threaded hole (11) of the T-code positioning plate (1) correspond to the oblong hole (52) one by one, and insert the bolt (3) from the bottom of the upper flange of the secondary purlin (5) into the oblong hole (52) and screw it into the internal threaded hole (11), so that the rod of the bolt (3) passes vertically upwards through the T-code positioning plate (1); Step 3: Use the laser line emitted by the laser marker to check the longitudinal line (121) of the cross reference line (12) on each T-code positioning plate (1); for the T-code positioning plate (1) whose longitudinal line (121) is not collinear with the corresponding laser line, fine-tune the T-code positioning plate (1) so that the longitudinal line (121) of the T-code positioning plate (1) is collinear with the corresponding laser line; and spot-weld the T-code positioning plate (1) to fix it on the secondary purlin (5); the distance between each two laser lines is the distance between the two lock edges of the metal roof panel (20); Step 4: After laying the thermal insulation rock wool (9) and the flexible waterproof layer (10) in sequence, the bolt (3) is passed through the through hole (23) of the T-code base (22) to place the T-code (2), and then the nut (4) is screwed onto the bolt (3). After all the T-codes (2) are tightened, the locking edge of the metal roof panel (20) is engaged with the top of the T-code (21), and then the locking edge is clamped with a wind-resistant clip (30).

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