Joint processing method for connection of large tower crane attached wall and fabricated outer wall

Abstract

The invention discloses a joint processing method for connection of a large tower crane attached wall and a fabricated outer wall. The joint processing method comprises the following steps that S1, the position of a tower crane foundation is determined; before building foundation construction, a tower crane manufacturer, a tower crane model and the position of a tower crane foundation need to be synchronously determined, and the factors are directly related to the horizontal distance of a tower crane wall-attached fulcrum, the vertical distance between a tower body and the wall-attached fulcrum and the distance between a tower crane wall-attached fulcrum and the tower crane wall-attached fulcrum; s2, determining a tower crane wall-attached model selection; when a wall attaching scheme is formulated, wall attaching components with proper sizes and models need to be selected strictly according to an operating instruction of the tower crane and in combination with the arrangement condition of prefabricated building PC components, and the problems that the wall attaching distance of the tower crane is too small or too large, the wall attaching length is too long, and the angle is too small or too large are avoided. The problem of adverse factors of connection of the tower crane attached wall and the fabricated building outer wall is effectively solved, the influence of the attached wall on the fabricated building outer wall structure is reduced, and the use safety of the tower crane is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and in particular to a method for processing nodes connecting a large tower crane attached wall and a prefabricated exterior wall. Background Art

[0002] In the existing technology, with the full promotion of prefabricated buildings, many projects have adopted prefabricated structures for their exterior walls, which are composed of prefabricated sandwich insulation exterior wall panels (60mm outer leaf concrete panels + 30mmXPS insulation panels + 200mm inner leaf concrete panels) + PCF panels (60mm outer leaf concrete panels + 30mmXPS insulation panels). For prefabricated high-rise residential buildings, it is inevitable to use tower cranes for vertical transportation of materials. In order to ensure that the tower crane can work safely and effectively, the tower crane attached to the wall plays an important role. The tower crane attached to the wall and the wall attachment device can significantly enhance the stability of the tower crane and reduce the risk of tower crane shaking caused by external forces (such as wind). At the same time, the tower crane attached to the wall can limit the swing range of the tower crane and reduce the danger caused by the swing of the tower body. Finally, the tower crane attached to the wall device can improve the load-bearing capacity of the tower crane and reduce the risk of tower crane instability caused by insufficient load-bearing; The main factors affecting the safety and stability of the tower crane attached to the wall include the type of wall attachment, the horizontal distance of the wall attachment support, the vertical distance between the tower body and the wall attachment support, the spacing of the tower crane attached to the wall, the overturning moment of the tower crane, the wind load and the strength and stress area of ​​the ear plate connecting wall. Among them, the strength and stress area of ​​the ear plate connecting wall set on the tower crane attached to the wall will directly affect the safety performance of the tower crane.

[0003] Therefore, the present invention proposes a node processing method for connecting a large tower crane attached wall with an assembled exterior wall to solve the above-mentioned problem. Summary of the invention

[0004] Based on the technical problem that the strength and stress-bearing area of ​​the ear plate connection wall set on the tower crane wall directly affect the safety performance of the tower crane, the present invention proposes a node processing method for connecting a large tower crane wall with an assembled exterior wall.

[0005] The present invention proposes a node processing method for connecting a large tower crane attached wall with an assembled exterior wall, comprising the following steps: S1: Determine the location of the tower crane foundation; Before the construction of the building foundation, it is necessary to simultaneously clarify the tower crane manufacturer, tower crane model, and the location of the tower crane foundation. The above factors are directly related to the horizontal distance of the tower crane's wall support, the vertical distance between the tower body and the wall support, and the distance between the tower crane and the wall. S2: Determine the type of tower crane attached to the wall; When formulating the wall attachment plan, it is necessary to strictly follow the tower crane instruction manual and combine the layout of the prefabricated building PC components to select the wall attachment components of appropriate size and model to avoid the tower crane wall attachment spacing being too small or too large, the wall attachment length being too long, and the angle being too small or too large; S3: Determine the location where the tower crane wall is connected to the outer wall of the prefabricated building; Since the exterior wall prefabricated wall panels and floor surfaces are usually connected by sleeve grouting after being positioned by pre-buried steel bars, it is best to avoid installing them on the exterior wall prefabricated wall panels to avoid affecting the sleeve grouting connection parts. The inner side of the exterior wall PCF board is usually a cast-in-place concealed column node. The steel bar connection at this part is usually designed according to traditional structural practices to meet the requirements of anchoring or lap length. Therefore, it is best to consider installing them on the wall of the exterior wall PCF board component with a cast-in-place structure on the inner side; S4: wall anchor production; The tower crane wall anchor is connected by embedded bolts. The anchor consists of an anchor plate, a double-ear plate and embedded bolts. The embedded bolts are matched with double nuts. The anchor plate and the double-ear plate are both made of Q335 steel. The size of the anchor plate is 500×330×20mm, the size of the double-ear plate is 500×270×20mm, and the spacing between the ear plates on both sides is 150mm. The double-ear plate is welded with grooves and welded symmetrically to the center line of the anchor plate. The height of the weld leg is 20mm. It is necessary to ensure that the weld is full and there is no slag inclusion. The anchor plate is arranged horizontally with 2 rows of φ30mm bolt holes, 3 holes in each row, and the hole spacing is 150mm. The bolt holes at the four corners are 40mm away from the longitudinal edge of the anchor plate and 100mm away from the horizontal edge of the anchor plate. Finally, the anchor plate and the double-ear plate are welded together, and the anchor plate and the embedded bolts are fixed to the wall of the PCF board component of the exterior wall with double nuts; S5: bolt selection for fixing anchors; According to the tower crane manual, six Ø30 bolt holes are arranged on the anchor, so the embedded bolts are M27, with a bolt length of 320mm, one end of the bolt is threaded, and the other end is a hook anchor end; S6: Installation of embedded bolts attached to the wall; The inner side of the external wall PCF board is a cast-in-place hidden column structure. While tying the hidden column steel bars, the embedded bolts are welded and fixed to the cast-in-place hidden column steel bars to avoid the inability to install the embedded bolts after the cast-in-place hidden column steel bars are tied. The embedded bolts are accurately positioned according to the vertical and horizontal positions of the wall-attached installation. A total of 6 Ø30 bolt holes are accurately drilled on the external wall PCF board using a water drill. The hole positions are the same as those on the anchor bottom plate. After the embedded bolts pass through the external wall PCF board, they are welded and fixed to the cast-in-place hidden column steel bars to strengthen the anti-slip ability of the embedded bolts in the concrete, so as to prevent the displacement of the external wall PCF board wall of the fixed anchor after the wall-attached installation is completed due to the displacement of the embedded bolts, thereby causing the wall to be pulled apart; S7: Wall mounted installation; After the anchor composed of the anchor base plate, double ear plate and embedded bolts is installed on the external wall PCF board wall, the selection of the wall, the location of the wall and the location of the anchor are checked again. After confirmation, the cast-in-place hidden column on the inner side of the external wall PCF board is cast. Considering the impact on the wall after the installation of the wall, the concrete strength of the cast-in-place hidden column is considered to be increased by two levels, from the original C30 concrete to C40. After the concrete is poured, the concrete should be reasonably maintained according to the environmental conditions and a sufficient curing period should be guaranteed. At the same time as the concrete is poured, multiple groups of test blocks with the same conditions must be made. When it is determined that the concrete strength of the cast-in-place hidden column reaches 80% of the design strength, the tower crane can be installed on the wall. The wall is connected by bolts through the Ø60 mounting hole on the double ear plate and the mounting hole at the end of the wall. When the concrete strength of the cast-in-place hidden column reaches 100%, the tower crane will be tested after acceptance to determine that the attachment connection position is firm and reliable and there is no abnormality in the wall before it can be put into use.

[0006] Beneficial effects of the present invention: 1. The traditional technical solution does not consider the installation position of the attached wall, and arbitrarily sets the attached wall at the position of the prefabricated exterior wall panel component or the PCF board. When the attached wall is set on the prefabricated exterior wall panel, the assembled exterior wall panel is inserted into the component from the bottom of the wall panel through the pre-embedded dowels, and then connected and fixed by sleeve grouting. After the attached wall is installed, the tower crane is operated, which is likely to cause cracking and displacement of the grouting part at the bottom of the prefabricated exterior wall panel, causing damage to the structure. The new technical solution is planned in the early stage to install the tower crane attached wall at the PCF board position, and use the cast-in-place hidden column structure on the inside of the PCF board to enhance the strength of the fixed attached wall, so as to ensure that the tower crane will not affect the wall during the operation after the attached wall is installed.

[0007] 2. The traditional technical solution does not consider the size of the anchoring bottom plate, resulting in a small force-bearing surface between the anchoring bottom plate and the wall, which causes cracks in the wall during the operation of the tower crane after the wall-mounted installation. The new technical solution fully considers the model of the tower crane and the selection of the wall, selects a larger anchoring bottom plate, increases the force-bearing area between the anchoring bottom plate and the wall, and reduces the impact on the wall during the operation of the tower crane after the wall-mounted installation.

[0008] 3. In the traditional technical solution, no protective measures are taken when drilling holes in the PCF, which causes damage or cracking of the exterior wall PCF board during the drilling process, affecting the appearance quality and structural safety of the wall. The new technical solution uses a water drill to drill holes, with a uniform drilling speed and moderate drilling force, which has minimal impact on the exterior wall PCF board and effectively ensures the quality of the wall panel.

[0009] 4. In the traditional technical solution, the embedded bolts for fixing the anchoring base plate are usually not anchored with a hook at one end for easy installation, or one end is fixed with a double nut after being welded and fixed to the cast-in-place concealed column steel bar, and the double nut is reserved in the concrete, resulting in poor anchoring of the embedded bolts in the concrete. During the operation of the tower crane after the wall installation, displacement occurs due to insufficient anchoring force of the embedded bolts, which leads to cracking of the wall. The new technical solution uses a hook anchoring method at one end of the embedded bolts for fixing the anchoring base plate to enhance the anchoring force of the embedded bolts in the concrete, thereby ensuring the safety of the tower crane attached to the wall and the safety of the wall structure of the fixed anchoring base plate.

[0010] 5. The traditional technical solution, for the parts where embedded parts attached to the wall are installed, does not consider increasing the concrete strength of the cast-in-place parts, concrete curing conditions and concrete strength conditions, and installs the tower crane attached to the wall and immediately puts the tower crane into use, resulting in cracks in the wall during the use of the tower crane. The new technical solution fully considers the above problems, increases the concrete strength level during the concrete pouring stage, performs concrete curing according to site conditions, and produces multiple groups of test blocks with the same conditions to determine whether the concrete strength meets the conditions for wall installation and tower crane trial operation, effectively ensuring the structural safety of the exterior wall, the safety of the wall installation and the tower crane use process.

[0011] Beneficial effects: The present invention effectively solves the unfavorable factors of the connection between the tower crane attached wall and the outer wall of the prefabricated building, reduces the influence of the attached wall on the outer wall structure of the prefabricated building, and ensures the safety of the tower crane in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The working flow diagram proposed for the present invention; Figure 2 A top view of the connection node between the wall anchor and the exterior wall PCF board wall proposed by the present invention; Figure 3 A top view of the wall anchoring member provided by the present invention; Figure 4 A side view of a wall anchoring member No. 1 proposed by the present invention; Figure 5 This is a side view of the wall anchor No. 2 proposed by the present invention.

[0013] In the figure: 1. Prefabricated exterior wall panel; 2. Inner side of exterior wall PCF panel; 3. Exterior wall PCF panel; 4. Anchoring base plate; 5. Double nuts; 6. Embedded bolts; 7. Double ear plate; 8. Ø60 mounting hole; 9. Bolt hole. DETAILED DESCRIPTION

[0014] The present invention will be further explained below in conjunction with specific embodiments. Example

[0015] Reference Figure 1-Figure 5 This embodiment proposes a node processing method for connecting a large tower crane attached wall with an assembled exterior wall, comprising the following steps: S1: Determine the location of the tower crane foundation; Before the construction of the building foundation, it is necessary to simultaneously clarify the tower crane manufacturer, tower crane model, and the location of the tower crane foundation. The above factors are directly related to the horizontal distance of the tower crane's wall support, the vertical distance between the tower body and the wall support, and the distance between the tower crane and the wall. S2: Determine the type of tower crane attached to the wall; When formulating the wall attachment plan, it is necessary to strictly follow the tower crane instruction manual and combine the layout of the prefabricated building PC components to select the wall attachment components of appropriate size and model to avoid the tower crane wall attachment spacing being too small or too large, the wall attachment length being too long, and the angle being too small or too large; S3: Determine the location where the tower crane wall is connected to the outer wall of the prefabricated building; Since the exterior wall prefabricated wall panel 1 and the floor surface are usually connected by sleeve grouting after being positioned by pre-buried steel bars, it is best to avoid installing it on the exterior wall prefabricated wall panel 1 to affect the sleeve grouting connection part. The inner side 2 of the exterior wall PCF board is usually a cast-in-place hidden column node. The steel bar connection at this part is usually designed according to traditional structural practices to meet the anchoring or lap length requirements. Therefore, it is best to consider installing it on the wall surface of the exterior wall PCF board 3 component with a cast-in-place structure on the inner side; S4: wall anchor production; The tower crane wall anchor is connected by embedded bolts 6. The anchor consists of an anchor plate 4, a double ear plate 7 and embedded bolts 6. The embedded bolts 6 are matched with double nuts 5. The anchor plate 4 and the double ear plate 7 are both made of Q335 steel. The size of the anchor plate 4 is 500×330×20mm, the size of the double ear plate 7 is 500×270×20mm, the distance between the ear plates on both sides is 150mm, and the double ear plate 7 is welded with grooves symmetrically to the center line of the anchor plate 4. Welding, the height of the weld leg is 20mm, and the weld must be full without slag inclusion. Two rows of φ30mm bolt holes 9 are arranged horizontally on the anchor plate 4, with 3 holes in each row and a hole spacing of 150mm. The bolt holes 9 at the four corners are 40mm away from the longitudinal edge of the anchor plate 4 and 100mm away from the horizontal edge of the anchor plate 4. Finally, the anchor plate 4 is welded with the double ear plate 7, and the anchor plate 4 and the embedded bolts 6 are fixed to the wall surface of the external wall PCF board 3 component with double nuts; S5: bolt selection for fixing anchors; According to the tower crane instruction manual, six Ø30 bolt holes 9 are arranged on the anchor, so the embedded bolt 6 is M27, the bolt length is 320mm, one end of the bolt is threaded, and the other end is a hook anchor end; S6: Install the embedded bolts 6 attached to the wall; The inner side of the external wall PCF board 3 is a cast-in-place hidden column structure. While tying the hidden column steel bars, the embedded bolts 6 are welded and fixed to the cast-in-place hidden column steel bars to avoid the inability to install the embedded bolts 6 after the cast-in-place hidden column steel bars are tied. The embedded bolts 6 are accurately positioned according to the vertical and horizontal positions of the wall attachment installation. A water drill is used to accurately drill holes on the external wall PCF board 3, with a total of 6 Ø30 bolt holes 9. The hole positions are the same as those on the anchor base plate 4. After the embedded bolts 6 pass through the external wall PCF board 3, they are welded and fixed to the cast-in-place hidden column steel bars to strengthen the anti-slip ability of the embedded bolts 6 in the concrete, so as to prevent the displacement of the external wall PCF board 3 fixing the anchor after the wall attachment installation is completed due to the embedded bolts 6, thereby causing the wall to be pulled apart; S7: Wall mounted installation; After the anchor composed of the anchor base plate 4, the double ear plate 7 and the embedded bolts 6 are installed on the wall of the external wall PCF board 3, the selection of the wall, the position of the wall and the position of the anchor are checked again. After confirmation, the cast-in-place hidden column on the inner side 2 of the external wall PCF board is cast. Considering the impact on the wall after the installation of the wall, the concrete strength of the cast-in-place hidden column is considered to be increased by two levels, from the original C30 concrete to C40. After the concrete is poured, the concrete should be reasonably maintained according to the environmental conditions and a sufficient curing period should be guaranteed. At the same time as the concrete pouring, multiple groups of test blocks with the same conditions must be made. When it is determined that the concrete strength of the cast-in-place hidden column reaches 80% of the design strength, the tower crane can be installed on the wall. The wall is connected by bolts through the Ø60 mounting hole 8 on the double ear plate 7 and the mounting hole at the end of the wall. When the concrete strength of the cast-in-place hidden column reaches 100%, the tower crane is tested after acceptance to determine that the attachment connection position is firm and reliable and that there is no abnormality in the wall before it can be put into use.

[0016] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A node processing method for connecting a large tower crane attached wall with an assembled exterior wall, characterized in that: The following steps are involved: S1: Determine the location of the tower crane foundation; Before the construction of the building foundation, it is necessary to simultaneously clarify the tower crane manufacturer, tower crane model, and the location of the tower crane foundation. The above factors are directly related to the horizontal distance of the tower crane's wall support, the vertical distance between the tower body and the wall support, and the distance between the tower crane and the wall. S2: Determine the type of tower crane attached to the wall; When formulating the wall attachment plan, it is necessary to strictly follow the tower crane instruction manual and combine the layout of the prefabricated building PC components to select the wall attachment components of appropriate size and model to avoid the tower crane wall attachment spacing being too small or too large, the wall attachment length being too long, and the angle being too small or too large; S3: Determine the location where the tower crane wall is connected to the outer wall of the prefabricated building; Since the exterior wall prefabricated wall panels (1) and the floor surface are usually positioned by pre-buried steel bars and then connected by sleeve grouting, it is best to avoid installing them on the exterior wall prefabricated wall panels (1) to avoid affecting the sleeve grouting connection parts. The inner side (2) of the exterior wall PCF board is usually a cast-in-place concealed column node. The steel bar connection at this part is usually designed according to traditional structural practices to meet the anchoring or lap length requirements. Therefore, it is best to consider installing them on the wall surface of the exterior wall PCF board (3) component with a cast-in-place structure on the inner side; S4: wall anchor production; The tower crane wall anchor is connected by embedded bolts (6). The anchor is composed of an anchor base plate (4), a double ear plate (7) and embedded bolts (6). The embedded bolts (6) are matched with double nuts (5). The anchor base plate (4) and the double ear plate (7) are both made of Q335 steel. The size of the anchor base plate (4) is 500×330×20mm, the size of the double ear plate (7) is 500×270×20mm, the distance between the ear plates on both sides is 150mm, and the double ear plate (7) is welded by grooves and is symmetrical to the center line of the anchor base plate (4). Welding is performed with a weld leg height of 20 mm. The weld must be full and free of slag inclusions. Two rows of φ30 mm bolt holes (9) are arranged horizontally on the anchoring base plate (4), with three holes in each row and a hole spacing of 150 mm. The bolt holes (9) at the four corners are 40 mm away from the longitudinal edge of the anchoring base plate (4) and 100 mm away from the transverse edge of the anchoring base plate (4). Finally, the anchoring base plate (4) and the double ear plate (7) are welded together. The anchoring base plate (4) and the embedded bolts (6) are fixed to the wall surface of the external wall PCF board (3) component using double nuts; S5: bolt selection for fixing anchors; According to the tower crane manual, six Ø30 bolt holes (9) are arranged on the anchor, so the embedded bolts (6) are M27, with a bolt length of 320 mm. One end of the bolt is threaded, and the other end is a hook anchor end. S6: Install the embedded bolts (6) attached to the wall; The inner side of the external wall PCF board (3) is a cast-in-place hidden column structure. While tying the hidden column steel bars, the embedded bolts (6) are welded and fixed to the cast-in-place hidden column steel bars to avoid the situation where the embedded bolts (6) cannot be installed after the cast-in-place hidden column steel bars are tied. The embedded bolts (6) are precisely positioned according to the vertical and horizontal positions of the wall attachment installation. A water drill is used to accurately drill holes on the external wall PCF board (3). A total of 6 Ø30 bolt holes (9) are provided. The hole positions are the same as those on the anchoring base plate (4). After the embedded bolts (6) pass through the external wall PCF board (3), they are welded and fixed to the cast-in-place hidden column steel bars to strengthen the anti-slip ability of the embedded bolts (6) in the concrete. This prevents the external wall PCF board (3) wall body of the fixing anchor from being displaced due to the embedded bolts (6) after the wall attachment installation is completed, thereby causing the wall body to be pulled apart. S7: Wall mounted installation; After the anchoring components consisting of the anchoring base plate (4), the double-ear plate (7) and the embedded bolts (6) are installed on the exterior wall PCF board (3), the selection of the wall attachment, the location of the wall attachment and the location of the anchoring components are rechecked. After confirmation, the cast-in-place hidden column on the inner side (2) of the exterior wall PCF board is cast. Considering the impact of the wall attachment on the wall after installation, the concrete strength of the cast-in-place hidden column is considered to be increased by two levels, from the original C30 concrete to C40. After the concrete is poured, the concrete should be adjusted according to environmental conditions. Reasonable maintenance is carried out and a sufficient maintenance period is ensured. During the concrete pouring, multiple groups of test blocks with the same conditions must be made. When the strength of the cast-in-place concealed column concrete reaches 80% of the design strength, the tower crane can be attached to the wall. The wall is connected by bolts through the Ø60 mounting hole (8) on the double ear plate (7) and the mounting hole at the end of the wall. When the strength of the cast-in-place concealed column concrete reaches 100%, the tower crane is tested after acceptance to ensure that the attachment connection position is firm and reliable and that there is no abnormality in the wall before it can be put into use.

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