CN111395641A - Precast concrete external wallboard and construction method thereof - Google Patents

Abstract

The invention relates to a prefabricated concrete external wall panel and a construction method thereof. The prefabricated concrete external wall panel is formed by pouring concrete, connecting steel bars are pre-buried in the prefabricated concrete external wall panel, hooks are embedded at the upper end of the prefabricated concrete external wall panel, and the precast concrete external wall panel is pre-buried. Load-bearing corbels and fastening connection components are pre-embedded at the inner lower end of the external wall panel, and fastening connection components are also pre-embedded at the inner upper part of the precast concrete external wall panel. The external wall panel can be directly hung on the main structure, and the angle steel connecting piece is positioned on the external wall panel and is fitted with the connecting rod and welded to the embedded part of the concrete beam, and then tightened and welded with the fastening connector through the nut. The rapid positioning and installation of the external wall panel is realized, the time for adjusting the verticality and levelness of the external wall panel is shortened, the construction process is simplified, the construction period is shortened, and the construction efficiency is improved.

Description

A kind of precast concrete external wall panel and construction method thereof

technical field

The invention relates to the technical field of construction, in particular to a prefabricated concrete external wall panel and a construction method thereof.

Background technique

With the development of urban construction, prefabricated buildings in my country's construction industry have been continuously promoted, and more and more buildings have begun to use prefabricated panels for construction, including many construction projects that use external wall panels as external maintenance structures.

The existing external wall panels usually have the problem of difficulty in installation and positioning. The production thickness error of the hanging panels can easily cause the external wall panels to fail to reach the predetermined position, and the hanging panels and the connecting parts are not closely attached; the hanging points are not accurate, and the setting of the hanging points Errors are easy to cause internal stress on the hanging panels, and irregular cracks along the upper and lower directions of the external wall panels; the cumulative error in the connection of external wall panels is large, which easily leads to irregular joints between the panels, poor appearance, and affects the quality and progress of the project; Reasonable, the installation sequence is unreasonable, after the connectors are welded first, the adjustment time of the verticality and levelness of the front of the external wall panel is too long, and even leads to dismantling and re-welding.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a prefabricated concrete external wall panel and a construction method thereof, which are safe and stable in hoisting, convenient in positioning and installation, accurate in hoisting, and small in cumulative error in connection between the wall panels.

The above-mentioned purpose of the invention is achieved through the following technical solutions:

A prefabricated concrete exterior wall panel, the prefabricated concrete exterior wall panel is formed by pouring concrete, connecting steel bars are pre-embedded in the prefabricated concrete exterior wall panel, and at least two horizontally arranged steel bars are pre-embedded at the upper end of the prefabricated concrete exterior wall panel. hook, at least two horizontally arranged load-bearing corbels and at least two horizontally arranged fastening connection components are pre-embedded at the inner lower end of the prefabricated concrete outer wall panel, and at least two Fastened connection components set horizontally.

By adopting the above technical solution, the angle steel connector is welded to the embedded part of the concrete beam after the precast concrete external wall panel is positioned, and then fastened and welded with the fastening connector, which can realize the rapid positioning and installation of the external wall panel, shorten the time The verticality and levelness adjustment time of the external wall panel is adjusted, and the load-bearing horn is used to bear the weight of the precast concrete external wall panel and is welded with the embedded parts in the concrete beam.

The present invention further provides that: the load-bearing corbel includes a first vertical plate, the same side of the first vertical plate is fixedly connected to the I-beam, the lower end of the I-beam is connected to a leveling device, and the first vertical plate is another The side is vertically connected with a plurality of hook-shaped anchor rods, the anchor rods are pre-buried in the precast concrete external wall panel, and the outer side of the first vertical plate is flush with the inner side of the precast concrete external wall panel.

By adopting the above technical solution, a plurality of anchor rods are embedded in the precast concrete external wall panel, which improves the supporting strength of the load-bearing corbel, and the leveling device can adjust the levelness of the precast concrete external wall panel.

The present invention is further provided that: the leveling device comprises a first internally threaded pipe vertically connected with the lower end of the I-beam, and the first internally threaded pipe is internally threadedly connected with an adjustment bolt.

By adopting the above-mentioned technical scheme, adjusting the in and out amount of the adjusting bolt in the first inner threaded pipe can conveniently and quickly fine-tune the horizontal pair of the precast concrete external wall panel.

The present invention is further provided that: the fastened connection assembly includes a fastened connection piece and an angle steel connection piece adapted to it, the fastened connection piece includes a second vertical plate and an L-shaped connecting rod, and one end of the connecting rod is provided with Thread, the connecting rod with one end of the thread vertically penetrates the second vertical plate and is fixedly connected with the second vertical plate, the other end of the connecting rod is pre-buried in the prefabricated concrete external wall panel, and the outer side of the second vertical plate is connected with the second vertical plate. The inner side of the precast concrete external wall panel is flush.

By adopting the above technical solution, the fastening connectors are pre-embedded on the precast concrete external wall panels. After the precast concrete external wall panels are hoisted in place, the angle steel connectors are adapted to the fastening connectors, and the angle steel connectors are welded. It is fixed to the embedded parts in the concrete beam, and finally the nut is tightened to the fastening connection for welding; to avoid the problem that the fastening connection and the angle steel connection cannot be adapted due to deviation, shortening the precast concrete external wall panel The adjustment time of horizontal and verticality improves the construction efficiency.

The present invention is further provided as follows: the angle steel connecting piece includes a lower angle steel connecting piece for adapting to the lower end fastening connecting piece of the precast concrete external wall panel, and an upper angle steel connecting piece for adapting to the fastening connecting piece above the precast concrete external hanging wall board The lower angle steel connecting piece includes mutually perpendicular angle steels, one side of the angle steel is provided with a through vertical waist-shaped hole, and both sides of the vertical waist-shaped hole are provided with ribs vertically connected to the angle steel; the The upper angle steel connecting piece includes mutually perpendicular angle steels, one side of the angle steel is provided with a through horizontal waist-shaped hole, and two sides of the horizontal waist-shaped hole are provided with ribs vertically connected to the angle steel.

By adopting the above technical solution, the vertical waist-shaped hole of the lower angle steel connecting piece can be fine-tuned in the vertical direction, and the horizontal waist-shaped hole of the upper angle steel connecting piece can be fine-tuned in the horizontal direction, which is convenient and better for tightening Fitting and welding of solid connectors.

The present invention is further provided as follows: a second inner threaded pipe pre-buried in the prefabricated concrete outer wall panel is arranged above the load-bearing corbel, and the second inner thread tube is vertically arranged with the prefabricated concrete outer wall panel.

By adopting the above technical solution, the auxiliary bolt ring is screwed on the second inner threaded pipe, and the auxiliary bolt ring is connected with the rope and the tensioning tool, which facilitates the adjustment of the horizontal and verticality of the precast concrete external wall panel.

The present invention is further provided as follows: the hook is n-shaped, the end of the hook is bent upward, and the top of the hook is 8-10 cm higher than the prefabricated concrete external wall panel.

By adopting the above technical solution, the pre-embedded hooks on the precast concrete external wall panels facilitate the hoisting of the precast concrete external wall panels, and the ends of the hooks are bent upwards, which improves the connection strength between the hooks and the precast concrete external wall panels .

The present invention is further provided as follows: window holes and door holes are reserved on the prefabricated concrete external wall panel.

By adopting the above technical solution, window holes and door openings are reserved on the precast concrete external wall panel before construction, which can avoid subsequent reconstruction holes and ensure the strength and firmness of the overall structure of the precast concrete external wall panel.

The construction method of the prefabricated concrete external wall panel of the present invention comprises the following steps:

Step 1. Pop up the control line on the precast concrete external wall panel and the concrete beam of the main structure;

Step 2, screw the auxiliary bolt ring on the second inner threaded pipe, and lift the precast concrete external wall panel through the rope connected with the hook to ensure that the precast concrete external wall panel is stably lifted and positioned to the preset position;

Step 3: Adjust the level and verticality of the precast concrete external wall panel by connecting ropes and tensioning tools on the auxiliary bolt ring and adjusting bolts on the load-bearing corbel;

Step 4. Weld the adjusting bolts of the load-bearing corbels to the embedded parts in the concrete beam;

Step 5: Pass the lower angle steel connection piece through the fastening connection piece at the lower end of the prefabricated concrete external wall panel, adjust the level of the lower angle steel connection piece, and weld with the embedded piece in the concrete beam;

Step 6. After the welding seam of the lower angle steel connector is completed, screw the fastening connector at the lower end of the precast concrete external wall panel to the nut and tighten and weld;

Step 7: Wear the upper angle steel connecting piece on the upper part of the prefabricated concrete external wall panel, adjust the level of the upper angle steel connecting piece, and weld with the embedded parts in the concrete beam;

Step 8. After the welding seam of the upper angle steel connector is completed, screw the fastening connector on the upper part of the prefabricated concrete external wall panel to connect the nut and tighten and weld;

Step 9: Remove the lifting rope.

By adopting the above technical solutions, the precast concrete external wall panels can be installed conveniently and quickly, and the hanging points are accurate, so as to avoid irregular cracks in the precast concrete external wall panels. Position adjustment time, improve work efficiency.

To sum up, the beneficial technical effects of the present invention are:

1. In the present invention, a load-bearing corbel is arranged at the lower end of the precast concrete external wall panel, and after the precast concrete external hanging wall panel is positioned, the angle steel connector is adapted to the fastening connector and then welded, which reduces the number of precast concrete external hangers. The wall panel installation and adjustment time simplifies the construction process, shortens the project construction period, saves the project cost, ensures the construction quality, and produces good economic and social benefits.

2. The present invention adopts prefabricated concrete external wall panels, which can improve the prefabrication rate of the factory, reduce the construction amount on the construction site, and reduce the pollution of dust and noise to the environment; it is convenient for transportation and improves the construction efficiency.

Description of drawings

Fig. 1 is the structural representation of the precast concrete external wall panel of the present invention;

Fig. 2 is the structural representation that the prefabricated concrete external hanging wall panel of the present invention is installed and completed;

Fig. 3 is the structural representation of the load-bearing corbel of the present invention;

Fig. 4 is the A-A sectional view of Fig. 3;

Fig. 5 is the structural representation of the lower angle steel connector of the present invention;

Fig. 6 is the structural schematic diagram of the upper angle steel connector of the present invention;

FIG. 7 is a schematic view of the structure of the fastening connector of the present invention.

As shown in the figure, 1. Precast concrete external wall panel; 2. Hook; 3. Load-bearing corbel; 31. The first vertical plate; 32. I-beam; 33. Leveling device; 331. The first internal thread pipe; 332 , Adjusting bolt; 34, Anchor rod; 4, Fastening connecting component; 41, Fastening connecting piece; 411, Second vertical plate; 412, Connecting rod; 42, Angle steel connecting piece; 421, Lower angle steel connecting piece; 4211, Vertical waist-shaped hole; 422, upper angle steel connector; 4221, horizontal waist-shaped hole; 5. Second internal threaded pipe; 6. Window hole; 7. Door hole; 8. Embedded parts in concrete beam; a, angle steel; b , Ribs.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a prefabricated concrete external wall panel 1, the precast concrete external wall panel 1 is made of concrete, and the prefabricated concrete external wall panel 1 is pre-embedded with connecting steel bars, and the embedded connecting steel bars must not only normally resist earthquake force , self-gravity and other forces under normal use, but also to ensure sufficient bending moment and shear force to prevent unfavorable stress generated in the production and hoisting process, and avoid unfavorable factors such as cracks and fractures of the components themselves; precast concrete external wall The upper end of the board 1 is pre-buried with three horizontally arranged hooks 2. The hooks 2 in this embodiment are n-shaped, and the ends of the hooks 2 are bent upwards, which improves the connection strength of the hooks 2 and the precast concrete external wall panel 1. The top of the hook 2 is 8-10cm higher than the precast concrete external wall panel 1. The embedded hook 2 on the precast concrete external wall panel 1 facilitates the hoisting of the precast concrete external wall panel 1. For the safety and hoisting safety of the concrete external wall panel 1, the calculation of the bearing capacity of the hook 2 is strengthened in the deepening design stage to prevent accidental decoupling of the components during the hoisting process.

Two horizontally arranged load-bearing corbels 3 and two horizontally arranged fastening connection components 4 are pre-embedded at the inner lower end of the precast concrete outer wall panel 1, and two horizontally arranged fastening connections are also pre-embedded at the inner upper part of the precast concrete outer wall panel 1 Component 4, by setting the load-bearing corbel 3 and the fastening connection component 4, the prefabricated concrete external wall panel 1 is loaded by the load-bearing corbel 3 after the hoisting and installation is completed. Therefore, the safety design of the load-bearing corbel 3 is particularly important. When deepening the design, focus on strengthening the calculation of the bearing capacity of the load-bearing corbel 3 to ensure construction safety.

As shown in Figures 3 and 4, the load-bearing corbel 3 includes a first vertical plate 31, the same side of the first vertical plate 31 is fixedly connected to an I-beam 32, and the lower end of the I-beam 32 is connected to a leveling device 33, and the leveling device 33 includes and The lower end of the I-beam 32 is vertically connected to a first internally threaded pipe 331, and the first internally threaded pipe 331 is internally threaded to connect the adjustment bolts 332; the other side of the first vertical plate 31 is vertically connected to a plurality of anchor rods 34, which are selected in this embodiment. The two layers of anchor rods 34 arranged in parallel up and down, each layer contains three anchor rods 34 distributed at intervals, and the anchor rods 34 are embedded in the precast concrete external wall panel 1, which can improve the support strength of the load-bearing corbel 3. The first vertical The outer side of the panel 31 is flush with the inner side of the precast concrete external wall panel 1 .

The leveling device 33 can adjust the levelness of the precast concrete external wall panel 1 . By adjusting the in and out amount of the adjusting bolt 332 in the first inner threaded pipe 331, the levelness of the precast concrete external wall panel 1 can be fine-tuned conveniently and quickly.

As shown in FIG. 7 , the fastening connection assembly 4 includes a fastening connection piece 41 and an angle steel connection piece 42 adapted thereto. The fastening connection piece 41 includes a second vertical plate 411 and an L-shaped connecting rod 412 , and one end of the connecting rod 412 has a There is a thread, and the connecting rod 412 with one end of the thread vertically penetrates the second vertical plate 411 and is fixedly connected with the second vertical plate 411. The other end of the connecting rod 412 is embedded in the precast concrete external wall panel 1. The outer side is flush with the inner side of the precast concrete external wall panel 1 .

As shown in FIGS. 5 and 6 , the angle steel connecting piece 42 includes a lower angle steel connecting piece 421 for adapting to the fastening connection piece 41 at the lower end of the precast concrete external wall panel 1 , and for adapting to the fastening connection above the precast concrete external hanging wall panel 1 . The upper angle steel connecting piece 422 of the part 41, the lower angle steel connecting piece 421 comprise mutually perpendicular angle steel a, one side of the angle steel a is provided with a through vertical waist-shaped hole 4211, and both sides of the vertical waist-shaped hole 4211 are provided with the angle steel a perpendicular to each other. Connected rib b; the upper angle steel connector 422 includes mutually perpendicular angle steel a, one side of the angle steel a is provided with a through horizontal waist-shaped hole 4221, and both sides of the horizontal waist-shaped hole 4221 are provided with a vertical connection with the angle steel a. .

Fastening connectors 41 are pre-embedded on the precast concrete external wall panel 1. After the precast concrete external wall panel 1 is hoisted in place, the angle steel connectors 42 are adapted to the fastening connectors 41, and the angle steel connectors 42 are welded. It is fixed to the embedded part 8 in the concrete beam, and finally tightened with nuts and welded; to avoid the problem that the fastening connector 41 and the angle steel connector 42 cannot be adapted due to deviation, shortening the level of the precast concrete external wall panel 1 and the adjustment time of the verticality, which greatly improves the speed of installing the precast concrete external wall panel 1. The vertical waist-shaped hole 4211 of the lower angle steel connector 421 can be fine-tuned in the vertical direction, and the horizontal waist of the upper angle steel connector 422 can be adjusted in the vertical direction. The shaped hole 4221 can be finely adjusted in the horizontal direction to facilitate better fitting and welding with the fastening connector 41 .

As shown in FIGS. 1 and 2 , above the load-bearing corbel 3 is a second internally threaded pipe 5 pre-buried in the precast concrete external wall panel 1 , and the second internally threaded pipe 5 is perpendicular to the precast concrete external wall panel 1 . An auxiliary bolt ring is screwed on the second inner threaded pipe 5 , and by connecting a rope and a tightening tool on the auxiliary bolt ring, it is convenient for people to adjust the level and verticality of the precast concrete external wall panel 1 .

According to design requirements, window holes 6 and door holes 7 can be reserved on the precast concrete external wall panel.

FIG. 2 is a schematic structural diagram of the completed installation of the precast concrete external wall panel.

The construction method of the precast concrete external wall panel 1 of the present invention comprises the following steps:

Step 1. Pop up the control line on the precast concrete external wall panel 1 and the concrete beam of the main structure;

Step 2, screw the auxiliary bolt ring on the second inner threaded pipe 5, and hoist the precast concrete external wall panel 1 through the rope connected with the hook 2 to ensure that the precast concrete external wall panel 1 is hoisted stably and positioned to the preset position;

Before lifting, check the position of the connecting point between the pole beam on the truck and the hook 2 to ensure that the precast concrete external wall panel 1 maintains a horizontal balance during the lifting process, and effectively prevent irregularities along the upper and lower directions of the precast concrete external wall panel 1. Cracks; according to the control line, make the precast concrete external wall panel 1 in the lifting close to the predetermined position and within the fine-tuning controllable range;

Step 3: Adjust the level and verticality of the precast concrete external wall panel 1 by connecting the rope and the tensioning tool on the auxiliary bolt ring, and the adjusting bolt 332 on the load-bearing corbel 3; use a level to adjust the precast concrete external wall panel 1 Measure the elevation and levelness, use the ruler to measure the verticality, horizontality, and verticality. Align the square ruler, find the verticality by the ruler, and cooperate with the jack, and adjust slowly to make the elevation, levelness and verticality of the components meet the design requirements.

Step 4. Weld the adjusting bolt 332 of the load-bearing corbel 3 to the embedded part 8 in the concrete beam;

Step 5: Wear the lower angle steel connection piece 421 through the fastening connection piece 41 at the lower end of the precast concrete external wall panel 1, adjust the level of the lower angle steel connection piece 421, and weld with the embedded part 8 in the concrete beam;

Step 6. After the welding seam of the lower angle steel connector 421 is completed, the fastening connector 41 at the lower end of the precast concrete external wall panel 1 is screwed to the nut and fastened and welded;

Step 7: Wear the upper angle steel connection piece 422 on the fastening connection piece 41 on the upper part of the precast concrete external wall panel 1, adjust the level of the upper angle steel connection piece 422, and weld with the embedded part 8 in the concrete beam;

Step 8. After the welding seam of the upper angle steel connector 422 is completed, the fastening connector 41 on the upper part of the precast concrete external wall panel 1 is screwed to the nut and fastened and welded;

Step 9: Remove the lifting rope.

The construction method makes the installation of the precast concrete external wall panel 1 convenient and quick, and the hanging point is accurate, so as to avoid irregular cracks in the prefabricated concrete external wall panel 1; the welding method of the angle steel connecting piece 42 is adopted, which greatly reduces the number of precast concrete external hanging wall panels. 1. Positioning, adjusting time, and improving work efficiency.

The embodiments of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention should be covered in within the protection scope of the present invention.

Claims (9)

1. A prefabricated concrete exterior wall panel, characterized in that, the prefabricated concrete exterior wall panel (1) is formed by pouring concrete, the prefabricated concrete exterior wall panel (1) is embedded with connecting steel bars, and the prefabricated concrete exterior wall panel (1) At least two horizontally arranged hanging hooks (2) are pre-embedded at the upper end of the panel (1), and at least two horizontally arranged load-bearing corbels (3) and at least two horizontally arranged load-bearing corbels (3) are pre-embedded at the lower end of the inner side of the precast concrete external wall panel (1). In the provided fastening connection assembly (4), at least two horizontally arranged fastening connection assemblies (4) are pre-embedded in the upper part of the inner side of the prefabricated concrete external wall panel (1). 2. The prefabricated concrete external wall panel according to claim 1, wherein the load-bearing corbel (3) comprises a first vertical plate (31), and the first vertical plate (31) is fixedly connected to the same side. A steel beam (32), the lower end of the I-beam (32) is connected to a leveling device (33), and the other side of the first vertical plate (31) is vertically connected with a plurality of hook-shaped anchor rods (34). The anchor rod (34) is pre-embedded in the prefabricated concrete outer wall panel (1), and the outer side surface of the first vertical plate (31) is flush with the inner side surface of the prefabricated concrete outer wall panel (1). 3. The precast concrete external wall panel according to claim 2, wherein the leveling device (33) comprises a first internally threaded pipe (331) vertically connected to the lower end of the I-beam (32), so The first internally threaded pipe (331) is internally threadedly connected to the adjusting bolt (332). 4. The prefabricated concrete exterior wall panel according to claim 1, characterized in that, the fastening connection assembly (4) comprises a fastening connection piece (41) and an angle steel connection piece (42) adapted thereto, the The fastening connector (41) includes a second vertical plate (411) and an L-shaped connecting rod (412), one end of the connecting rod (412) is threaded, and the connecting rod (412) with the threaded end vertically penetrates the second The vertical plate (411) is fixedly connected with the second vertical plate (411), the other end of the connecting rod (412) is pre-buried in the precast concrete external wall panel (1), and the second vertical plate (411) is outside The side surface is flush with the inner side surface of the precast concrete external wall panel (1). 5. The precast concrete external wall panel according to claim 4, characterized in that, the angle steel connector (42) comprises a lower part for adapting to the lower end fastening connector (41) of the precast concrete external wall panel (1). Angle steel connecting piece (421) for adapting to the upper angle steel connecting piece (422) of the fastening connecting piece (41) above the precast concrete exterior wall panel (1), the lower angle steel connecting piece (421) comprising mutually perpendicular angle steel (a), one side of the angle steel (a) is provided with a through vertical waist-shaped hole (4211), and both sides of the vertical waist-shaped hole (4211) are provided with ribs ( b); the upper angle steel connecting piece (422) includes mutually perpendicular angle steel (a), one side of the angle steel (a) is provided with a through horizontal waist-shaped hole (4221), the horizontal waist-shaped hole (4221) Both sides are provided with ribs (b) vertically connected to the angle steel (a). 6. The prefabricated concrete exterior wall panel according to claim 1, characterized in that, above the load-bearing corbel (3), a second internally threaded pipe ( 5), the second inner threaded pipe (5) is vertically arranged with the precast concrete external wall panel (1). 7. The prefabricated concrete exterior wall panel according to claim 1, wherein the hook (2) is an n-shaped, the end of the hook (2) is bent upward, and the top of the hook (2) is higher than Precast concrete external wall panel 8-10cm. 8 . The prefabricated concrete external wall panel according to claim 1 , wherein a window hole ( 6 ) and a door opening ( 7 ) are reserved on the prefabricated concrete external wall panel ( 1 ). 9 . 9. A construction method for the precast concrete external wall panel according to any one of claims 1 to 8, characterized in that, comprising the following steps: Step 1. Pop up the control line on the precast concrete external wall panel (1) and on the concrete beam of the main structure; Step 2: Screw the auxiliary bolt ring on the second inner threaded pipe (5), and lift the precast concrete external wall panel (1) through the rope connected to the hook (2) to ensure that the precast concrete external wall panel (1) is lifted Smooth and locate to preset position; Step 3: Adjust the level and verticality of the precast concrete external wall panel (1) by connecting the rope and the tensioning tool on the auxiliary bolt ring, and the adjusting bolt (332) on the load-bearing corbel (3); Step 4. Weld the adjusting bolt (332) of the load-bearing corbel (3) to the embedded part (8) in the concrete beam; Step 5: Put the lower angle steel connection piece (421) through the fastening connection piece (41) at the lower end of the precast concrete external wall panel (1), adjust the level of the lower angle steel connection piece (421), and connect it with the embedded parts in the concrete beam. (8) Welding; Step 6: After the welding seam of the lower angle steel connecting piece (421) is completed, the fastening connecting piece (41) at the lower end of the precast concrete external wall panel (1) is screwed to the nut and fastened and welded; Step 7: Insert the upper angle steel connection piece (422) through the fastening connection piece (41) on the upper part of the precast concrete external wall panel (1), adjust the level of the upper angle steel connection piece (422), and connect it with the embedded parts in the concrete beam. (8) Welding; Step 8. After the welding seam of the upper angle steel connector (422) is completed, the fastening connector (41) on the upper part of the precast concrete external wall panel (1) is screwed to the nut and fastened and welded; Step 9: Remove the lifting rope.

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