Construction method of high-rise building top layer multi-wall system

Abstract

The invention discloses a construction method of a high-rise building top layer multi-wall system. The method specifically comprises the following steps that S1, steel column installation point measurement is conducted on a corresponding floor according to the steel column installation position in a third truss framework layer; a foundation bolt fixing frame is pre-buried; s2, steel columns are hoisted, the bottoms of the steel columns are fixedly connected with pre-buried foundation bolt fixing frames correspondingly, and hoisting of the steel columns in the third truss framework layer is completed; s3, after the steel columns are installed, hoisting steel beams to be installed between the steel columns, and completing installation of a third truss framework layer unit; s4, after the third truss framework layer is installed, steel columns and steel beams of the first truss framework layer and the second truss framework layer are hoisted in sequence; and after the first truss framework layer and the second truss framework layer are hoisted, the fourth truss framework layer and the fifth truss framework layer are sequentially installed, and installation of the multi-layer single wall is completed. According to the method, the middle framework layer is firstly mounted, and then the framework layers on the two sides are mounted, so that the mounting stability of the steel structure framework layers is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a construction method of a multi-wall system on the top floor of a high-rise building. Background Art

[0002] With the acceleration of urbanization, the demand for renovation of existing high-rise buildings is increasing. Rooftop areas, in particular, often require functional upgrades through the addition of facilities (such as service floors, green spaces, or functional floors). However, the original structural design of existing rooftops often lacks additional load redundancy, leading to problems such as insufficient bearing capacity and reduced seismic performance during renovation. Rooftop structural reinforcement is urgently needed.

[0003] Defects of existing technology: 1. It is difficult to control the installation accuracy. High-rise steel structures require extremely high component positioning accuracy, especially the top structure needs to cope with dynamic influences such as wind load and temperature deformation, which leads to large errors in high-altitude installation. 2. Construction safety under complex working conditions; risks of component hoisting: the top steel components are large in size and weight, making hoisting inconvenient; 3. High-altitude welding quality; welding operations need to overcome climatic influences (such as wind, rain, and low temperatures), and thick plate welding is prone to deformation and residual stress, resulting in uneven stress distribution.

[0004] 4. Application No. 202110752859.8 discloses a method for the construction and installation of steel structures for super high-rise buildings, S1: material preparation S2: steel structure installation; S3: steel structure welding; S4: bottom plate welding; S5: steel structure lifting; S6: steel structure inspection; the construction of high-rise building steel structures is carried out by this method, which is only applicable to the steel structure frame type for reinforcing the top floor of conventional high-rise buildings, and is unstable for reinforcing stepped roofs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a construction method for a multi-wall system on the top floor of a high-rise building. The method of the present invention improves the stability of the installation of the steel structure frame layer by first installing the middle frame layer and then installing the frame layers on both sides.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution provided by the present invention is as follows: A method for constructing a multi-wall system on the top floor of a high-rise building, wherein the multi-wall system is provided on the top floor of the high-rise building and is composed of multiple layers of monolithic walls. The multi-wall system includes a first frame layer, a second frame layer, a third frame layer, a fourth frame layer, and a fifth frame layer. The multiple layers of monolithic walls are distributed in a stepped manner. The method specifically comprises the following steps: S1, measure the steel column installation points on the corresponding floors according to the installation positions of the steel columns in the third frame layer; and pre-embed the anchor bolt fixing frame at the measurement points; S2, hoist the steel columns and connect and fix the bottoms of the steel columns to the pre-buried anchor bolt fixing frames, completing the hoisting of the steel columns in the third frame layer; S3: After the steel columns are installed, the steel beams are hoisted and installed between the steel columns, completing the installation of the third frame unit. S4, after the installation of the third frame layer is completed, the steel columns and steel beams of the first frame layer and the second frame layer are hoisted in sequence; after the hoisting of the first frame layer and the second frame layer is completed, the fourth frame layer and the fifth frame layer are installed in sequence to complete the installation of the multi-layer single-piece wall.

[0007] Furthermore, the anchor bolt fixing frame is a crisscross frame structure as a whole, and the anchor bolt fixing frame includes long bolts and fixed steel plates. Long bolts are set at the four corners of the fixed steel plates, and the long bolts are vertically connected to the fixed steel plates. Two fixed steel plates are set parallel to the long bolts. When the anchor bolt fixing frame is embedded, the fixed steel plates are embedded in the concrete, and the long bolts extend out of the concrete.

[0008] Furthermore, the steel column is hoisted as follows: S21, steel column pretreatment: before the steel column is hoisted, install lifting lugs at the four corners of the top of the steel column and place sleepers at the bottom of the steel column; S22, connect the lifting ears on the steel column to the lifting hooks through the slings, lift the top of the steel column by 1m, and install the guy rope on the top of the steel column; S23, lifting the steel column and hoisting it above the pre-buried anchor bolt fixing frame, so that the bottom of the steel column is connected and fixed with the anchor bolt fixing frame by bolts; S24, connect the guy rope to the pre-buried steel anchor ring on the floor to fix the steel column on the floor.

[0009] Furthermore, guy ropes are installed at the four corners of the upper part of the steel column, one end of the guy rope is connected to the lifting ear, and the other end of the guy rope is connected and fixed to the pre-buried steel anchor ring on the floor, and the guy rope forms a 45° angle with the floor.

[0010] Furthermore, before the steel column is lifted, a ladder is installed on the side of the steel column, and construction workers use the ladder to connect and install the steel column and the steel beam, and the angle between the lifting cables is no more than 30°.

[0011] Furthermore, the steel beam hoisting is specifically as follows: S31, pre-treatment of steel beams, installation of lifting lugs at both ends of the steel beam side; S32, connect the lifting ears on the steel beam to the hooks respectively through the slings; S23, lifting the steel beam and hoisting it between the steel columns for installation, so that both ends of the steel beam are connected to the steel columns respectively.

[0012] Furthermore, when the steel beam is hoisted, the angle between the lifting cables is not greater than 60°; when the flange thickness of the steel beam is not greater than 16 mm and the mass of the steel beam is less than 4 tons, lifting holes are opened at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting holes; when the flange thickness of the steel beam is not greater than 16 mm and the mass of the steel beam is greater than 4 tons, lifting ears are welded at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting ears; when the flange thickness of the steel beam is greater than 16 mm, lifting ears are welded at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting ears.

[0013] Furthermore, a plurality of bolt holes are provided at both ends of the steel beam, a connecting plate is provided on the side of the steel column, and bolt holes are provided on the connecting plate. The steel beam and the steel column are fixed by bolts. When the steel beam is installed, it is first pre-fixed by installing bolts. The number of installing bolts is not less than 30% of the total number of bolts at the installation node and not less than two. After the pre-fixation of the steel beam is completed, the installation angle of the steel beam is corrected by a jack or a hand hoist. After the correction of the steel beam is completed, the installation bolts between the steel beam and the steel column are replaced with high-strength bolts to complete the installation of the steel beam.

[0014] Furthermore, the installation steps of the steel columns and steel beams of each frame layer in the multi-layer monolithic wall are the same.

[0015] Based on the above technical solution, the construction method of a multi-wall system for the top floor of a high-rise building of the present invention has achieved the following technical advantages through practical application: 1. The construction method of the multi-piece wall system on the top floor of a high-rise building of the present invention improves the stability of the installation of the steel structure frame layer by first installing the middle frame layer and then installing the frame layers on both sides.

[0016] 2. The construction method of a multi-wall system on the top floor of a high-rise building of the present invention provides a transverse connection structure between adjacent frame layers to uniformly distribute stress on the single wall, avoid stress concentration, and eliminate residual stress in each frame layer.

[0017] 3. The construction method of the multi-piece wall system on the top floor of a high-rise building of the present invention improves the stability of the installation of steel structure components of the high-rise building by setting up cables and ropes. At the same time, the cables and ropes provide auxiliary functions for the correction of steel columns, thereby reducing the error of steel column installation.

[0018] 4. The construction method of the multi-piece wall system on the top floor of a high-rise building of the present invention improves the installation stability and safety of the steel structure by using high-strength bolts to connect and fix the steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is the main view of multilayer single wall structure in the construction method of high-rise building top layer multi-wall system.

[0020] Figure 2 It is the plan view of multilayer single wall structure in the construction method of high-rise building top layer multi-wall system.

[0021] Figure 3 It is the perspective view of multilayer single wall structure in the construction method of high-rise building top layer multi-wall system.

[0022] Figure 4 It is the hoisting structure diagram of steel column in the construction method of high-rise building top layer multi-wall system.

[0023] Figure 5 It is the installation and fixation schematic diagram of steel column in the construction method of high-rise building top layer multi-wall system.

[0024] Figure 6 It is the correction measurement schematic diagram of steel column in the construction method of high-rise building top layer multi-wall system.

[0025] Figure 7 It is the anchor bolt fixing frame schematic diagram in the construction method of high-rise building top layer multi-wall system. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described below through specific examples shown in the drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0027] Example 1, as Figures 1-7As shown, the present invention belongs to a construction method of a multi-piece wall system on the top floor of a high-rise building, wherein a multi-piece wall system composed of multiple layers of single-piece walls is arranged on the top floor of the high-rise building, and the multi-piece wall system includes a first frame layer 1, a second frame layer 2, a third frame layer 3, a fourth frame layer 4 and a fifth frame layer 5, and the multiple layers of single-piece walls are distributed in a stepped manner, and the adjacent frame layers are connected by a transverse connecting structure 11; the transverse connecting structure 11 transversely connects the adjacent frame layers by setting steel columns 7 and steel beams 9, and the transverse connecting structure is installed after the steel columns 7 and steel beams 9 in the adjacent frame layers are installed, so that the stress distribution of the single-piece wall is uniform and stress concentration is avoided. The multi-layer single-piece wall is symmetrically installed on the top floor of the building. After the installation of the first frame layer 1, the second frame layer 2, the third frame layer 3, the fourth frame layer 4 and the fifth frame layer 5 is completed, the sixth frame layer 6 is installed between the fifth frame layer 5 to complete the installation of all frame layers.

[0028] Example 2, based on Example 1, a construction method of a multi-wall system of this embodiment, the method specifically includes the following steps: S1, measuring the installation points of the steel columns 7 on the corresponding floors according to the installation positions of the steel columns 7 in the third frame layer 3; and pre-embedding the anchor bolt fixing frames at the measurement points; S2, hoisting the steel column 7, connecting and fixing the bottom of the steel column 7 to the pre-buried anchor bolt fixing frame, completing the hoisting of the steel column 7 in the third frame layer 3; S3, after the steel columns 7 are installed, the steel beams 9 are hoisted and installed between the steel columns 7, completing the installation of the third frame layer 3 unit; S4, after the installation of the third frame layer 3 is completed, the steel columns 7 and steel beams 9 of the first frame layer 1 and the second frame layer 2 are hoisted in sequence; after the hoisting of the first frame layer 1 and the second frame layer 2 is completed, the fourth frame layer 4 and the fifth frame layer 5 are installed in sequence to complete the installation of the multi-layer monolithic wall.

[0029] like Figure 7 As shown, the anchor bolt fixing frame is a crisscross frame structure as a whole. The anchor bolt fixing frame includes long bolts 101 and fixed steel plates 12. Long bolts are set at the four corners of the fixed steel plates 12. The long bolts 101 are vertically connected to the fixed steel plates 12. Two fixed steel plates 12 are set parallel to the long bolts 101. When the anchor bolt fixing frame is embedded, the fixed steel plates 12 are embedded in the concrete, and the long bolts 101 extend out of the concrete.

[0030] Example 3, based on Examples 1 and 2, Figures 4-6 As shown, the steel column 7 is hoisted as follows: S21, pre-treatment of the steel column 7. Before the steel column 7 is hoisted, lugs are installed at the four corners of the top of the steel column 7 and sleepers are placed at the bottom of the steel column 7; S22, connect the lifting ears on the steel column 7 to the lifting hooks respectively through the slings, lift the top of the steel column 7 by 1m, and install the cable 8 on the top of the steel column 7; S23, lifting the steel column 7 and hoisting it above the pre-buried anchor bolt fixing frame, so that the bottom of the steel column 7 is bolted to the anchor bolt fixing frame; S24, connect the guy rope 8 to the pre-buried steel anchor ring on the floor, and fix the steel column 7 on the floor.

[0031] The arrangement of the guy ropes 8 improves the stability of the installation of the steel structure components of the high-rise building, and the guy ropes 8 provide an auxiliary function for the correction of the steel columns 7.

[0032] Cables 8 are installed at the four corners of the upper part of the steel column 7. One end of the cable 8 is connected to the lifting ear, and the other end of the cable 8 is connected and fixed to the pre-buried steel anchor ring of the floor. The cable 8 forms a 45° angle with the floor.

[0033] Before lifting the steel column 7, a ladder is installed on the side of the steel column 7, and the construction workers use the ladder to connect and install the steel column 7 and the steel beam 9, and the angle between the slings is not greater than 30°; the ladder makes it convenient for the construction workers to install the steel column 7 and the steel beam 9, and it is also convenient to remove the lifting ears above the steel column 7 and the lifting ears on the steel beam 9 after the installation of the steel column 7 and the steel beam 9 is completed.

[0034] In Example 4, the steel beam 9 is hoisted as follows: S31, pre-processing the steel beam 9 and installing lifting lugs on both ends of the side of the steel beam 9; S32, connecting the lifting ears on the steel beam 9 to the hooks respectively through the slings; S23, lifting the steel beam 9 and hoisting it between the steel columns 7 for installation, so that both ends of the steel beam 9 are connected to the steel columns 7 respectively.

[0035] When the steel beam 9 is hoisted, the angle between the slings is not greater than 60°; when the flange thickness of the steel beam 9 is not greater than 16 mm and the mass of the steel beam 9 is less than 4 tons, hoisting holes are opened at the three-division points on the side of the steel beam 9, and the steel beam 9 is hoisted through the hoisting holes; when the flange thickness of the steel beam 9 is not greater than 16 mm and the mass of the steel beam 9 is greater than 4 tons, lifting ears are welded at the three-division points on the side of the steel beam 9, and the steel beam 9 is hoisted through the lifting ears; when the flange thickness of the steel beam 9 is greater than 16 mm, lifting ears are welded at the three-division points on the side of the steel beam 9, and the steel beam 9 is hoisted through the lifting ears.

[0036] There are multiple bolt holes at both ends of the steel beam 9, and a connecting plate is provided on the side of the steel column 7, and bolt holes are provided on the connecting plate. The steel beam 9 and the steel column 7 are fixed by bolts. When the steel beam 9 is installed, it is first pre-fixed by installing bolts. The number of installing bolts is not less than 30% of the total number of bolts at the installation node and not less than two. After the pre-fixation of the steel beam 9 is completed, the installation angle of the steel beam 9 is corrected by a jack or a hand hoist. After the correction of the steel beam 9 is completed, the installation bolts between the steel beam 9 and the steel column 7 are replaced with high-strength bolts to complete the installation of the steel beam 9.

[0037] Before construction, high-strength bolt connections should be inspected and re-inspected for the connection parts and friction surfaces. Only after they pass the inspection can they be installed. Bolt installation is carried out in two steps: The first step is to hoist the steel structure and fix it with temporary bolts or nails. It is strictly forbidden to use high-strength bolts as temporary bolts. The number of temporary bolts should not be less than 1 / 3 of the total number of bolts and no less than two; The second step is to replace the temporary bolts with high-strength bolts for fastening; High-strength bolts must be tightened in two steps. The first step is initial tightening, which is done to 50-80% of the final axial force of the bolts. The second step is final tightening, which is done to the standard pre-tension with a deviation of no more than ±10%. Under normal circumstances, a special electric wrench is used for final tightening, and the removal of the plum head marks the end of final tightening. When a special wrench cannot be used for some operations, torsion-shear type high-strength bolts should be constructed using the torque method according to the large hexagonal head high-strength bolts. After the final tightening is completed, check for any missing or insufficient tightening. Use a small hammer weighing 0.3-0.5kg to knock each bolt one by one. If any missing or insufficient tightening is found, re-tighten it. Over-tightening should be replaced. During the inspection, the nut should be backed off 30°-50° and then tightened to its original position. The final tightening torque value should be measured. The deviation should not exceed ±10%. Mark the bolts that have passed the final tightening to avoid confusion. Using high-strength bolts to connect and fix steel structures improves the stability and safety of steel structure installation.

[0038] like Figure 6 As shown, when the steel column 7 is installed and corrected, two theodolites are set up on a control line that is 90 degrees and 1 meter apart and looking in the same direction. The theodolite operator observes the small steel ruler on the top of the column, measures the deviation of the steel column 7 and directs the correction; The installation steps of the steel columns 7 and steel beams 9 of each frame layer in the multi-layer monolithic wall are the same.

[0039] Before installing multi-layer monolithic walls, benchmark points must be measured to ensure installation accuracy during high-altitude operations. Step 1: Use the "external control method" to arrange 6 main control points around the ground: establish plane measurement benchmark points, and set up 6 measurement benchmark points on site; Step 2: Based on the three main control points, use the method of wire round-trip observation to determine the first-floor plane control network; Step 3: Vertical measurement of control points, from the foundation to the third floor as the first elevation measurement benchmark, and the second to the top; Step 4: Surveying and setting up the elevation control network. The present invention adopts the tower ruler vertical surveying method along the column. Step 5: Based on the control points obtained from the survey, use the same measurement method as before to measure and set up the plane control network of each floor.

[0040] By measuring the benchmark points, the installation accuracy of high-altitude operations is guaranteed, the installation accuracy of steel columns and steel beams during the construction of the top floor of high-rise buildings is improved, and the stability of the installation equipment is improved.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present invention. They should all be included in the scope of the technical solutions for which protection is sought in the present invention.

Claims

1. A construction method for a multi-wall system on the top floor of a high-rise building, characterized in that: A multi-wall system composed of multiple layers of monolithic walls is provided on the top floor of a high-rise building. The multi-wall system includes a first frame layer, a second frame layer, a third frame layer, a fourth frame layer, and a fifth frame layer. The multiple layers of monolithic walls are distributed in a stepped manner. The method specifically includes the following steps: S1, measure the steel column installation points on the corresponding floors according to the installation positions of the steel columns in the third frame layer; and pre-embed the anchor bolt fixing frame at the measurement points; S2, hoist the steel columns and connect and fix the bottoms of the steel columns to the pre-buried anchor bolt fixing frames, completing the hoisting of the steel columns in the third frame layer; S3: After the steel columns are installed, the steel beams are hoisted and installed between the steel columns, completing the installation of the third frame unit. S4, after the installation of the third frame layer is completed, the steel columns and steel beams of the first frame layer and the second frame layer are hoisted in sequence; after the hoisting of the first frame layer and the second frame layer is completed, the fourth frame layer and the fifth frame layer are installed in sequence to complete the combined installation of multi-layer single-piece walls, forming a multi-piece wall system for high-rise buildings.

2. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 1, characterized in that: The anchor bolt fixing frame is a crisscross frame structure as a whole. The anchor bolt fixing frame includes long bolts and fixed steel plates. Long bolts are set at the four corners of the fixed steel plates. The long bolts are vertically connected to the fixed steel plates. Two fixed steel plates are set parallel to the long bolts. When the anchor bolt fixing frame is embedded, the fixed steel plates are embedded in the concrete and the long bolts extend out of the concrete.

3. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 1, characterized in that: The steel column is hoisted specifically as follows: S21, pre-treatment of steel columns: before hoisting the steel columns, install lifting lugs at the four corners of the top of the steel columns and place sleepers at the bottom of the steel columns; S22, connect the lifting ears on the steel column to the lifting hooks through the slings, lift the top of the steel column by 1m, and install the guy rope on the top of the steel column; S23, lifting the steel column and hoisting it above the pre-buried anchor bolt fixing frame, so that the bottom of the steel column is connected and fixed with the anchor bolt fixing frame by bolts; S24, connect the guy rope to the pre-buried steel anchor ring on the floor to fix the steel column on the floor.

4. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 3, characterized in that: Guy ropes are installed at the four corners of the upper part of the steel column. One end of the guy rope is connected to the lifting ear, and the other end of the guy rope is connected and fixed to the pre-buried steel anchor ring on the floor. The guy rope forms a 45° angle with the floor.

5. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 3, characterized in that: Before the steel column is lifted, a ladder is installed on the side of the steel column. Construction workers use the ladder to connect and install the steel column and the steel beam. The angle between the lifting cables is no more than 30°.

6. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 1, characterized in that: The steel beam hoisting is specifically as follows: S31, pre-treatment of steel beams, installation of lifting lugs at both ends of the steel beam side; S32, connect the lifting ears on the steel beam to the hooks respectively through the slings; S23, lifting the steel beam and hoisting it between the steel columns for installation, so that both ends of the steel beam are connected to the steel columns respectively.

7. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 6, characterized in that: When the steel beam is hoisted, the angle between the lifting cables is not greater than 60°; when the flange thickness of the steel beam is not greater than 16 mm and the mass of the steel beam is less than 4 tons, lifting holes are opened at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting holes; when the flange thickness of the steel beam is not greater than 16 mm and the mass of the steel beam is greater than 4 tons, lifting ears are welded at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting ears; when the flange thickness of the steel beam is greater than 16 mm, lifting ears are welded at the points dividing the side of the steel beam into three equal parts, and the steel beam is hoisted through the lifting ears.

8. The construction method of a multi-wall system on the top floor of a high-rise building according to claim 6, characterized in that: There are multiple bolt holes at both ends of the steel beam, and a connecting plate is provided on the side of the steel column. The connecting plate is provided with bolt holes. The steel beam and the steel column are fixed by bolts. When the steel beam is installed, it is first pre-fixed by installing bolts. The number of installing bolts is not less than 30% of the total number of bolts at the installation node and not less than two. After the pre-fixation of the steel beam is completed, the installation angle of the steel beam is corrected by a jack or a hand hoist. After the correction of the steel beam is completed, the installation bolts between the steel beam and the steel column are replaced with high-strength bolts to complete the installation of the steel beam.

9. The construction method of a multi-piece wall system on the top floor of a high-rise building according to claim 1, characterized in that: The installation steps of the steel columns and steel beams of each frame layer in the multi-layer monolithic wall are the same.

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