CN108729640B - Mounting method of cantilever plate of assembled building - Google Patents

Abstract

The invention provides a support frame for a prefabricated building cantilever board, which includes a portal bracket located on the inside of the floor slab. The top of the portal bracket is provided with a height-adjustable slot support; several cross beams are connected through the slot supports. On the top of the portal bracket, one end extends out of the floor to form a cantilevered section of a certain length. The crossbeams are arranged parallel to each other to support the weight of the cantilevered plate; the first bracket is located at the end of the cantilevered section of the crossbeam. It is used to support the edge beam on the outside of the cantilevered board; the diagonal tie rod is set obliquely relative to the floor, with one end connected to the top of the vertical component near the outside of the floor, and the other end anchored to the floor to increase the stability of the portal bracket. The support frame of the prefabricated building cantilever plate provided by the present invention eliminates the need to erect a high support frame under the cantilever plate, reduces operating risks, and improves construction efficiency. The invention also provides a cantilever plate installation method using the support frame.

Description

An installation method of prefabricated building cantilever panels

Technical field

The invention relates to the technical field of building construction, and in particular to an installation method of a prefabricated building cantilever panel.

Background technique

Prefabricated building means that some or all components of the building are produced in the component prefabrication factory, and then transported to the construction site through corresponding transportation methods. Reliable installation methods and installation machinery are used to assemble the components to become a functional building. The way things are constructed. Compared with on-site construction, prefabricated construction has the advantages of convenient construction, fast project progress, little impact on the surrounding environment, and the quality of building components can be easily guaranteed. In the past, it was mainly used in industrial buildings in our country. In recent years, it has begun to be used in industrial buildings. Used in civil construction, especially residential construction. With the acceleration of urbanization in our country, prefabricated buildings have also ushered in new development opportunities.

The existing prefabricated cantilever plate support method is mostly supported by scaffolding arranged under the cantilever plate. This support method requires a large amount of work to disassemble and assemble the support frame, and requires a support platform directly under the cantilever plate, which is difficult for high-rise volleys. The cantilevered (balcony) board requires high formwork scaffolding support, and the operation risk is high.

Also used is to add diagonal braces on the lower walls or columns to support the cantilevered panels (CN201710825046), or to support the cantilevered panels on vertical components through angled steel (CN201521110523). However, the method of adding diagonal bracing or angled steel braces to the lower wall columns to support the cantilevered board requires continuous vertical components under the board. Otherwise, it can only support the left and right sides of the cantilevered board. There are insufficient support points and it is easy to overturn. In addition, this support method requires the lower vertical components to reach sufficient strength before they can be used to support the cantilevered panels. It cannot be constructed quickly and has a great impact on the construction period.

Contents of the invention

In order to make up for the deficiencies in the prior art, the present invention provides a method for installing a prefabricated building cantilever plate, which eliminates the need to erect a high support frame under the cantilever plate, reduces operating risks, and improves construction efficiency.

In order to achieve its purpose, the technical solutions adopted by the present invention are as follows:

A support frame for prefabricated building cantilever panels, including:

The portal bracket is located on the inside of the floor slab and is used to support the weight of the frame beam on the inside of the cantilever plate. It includes a number of transverse members and a number of vertical members. The top of the portal bracket is provided with a height-adjustable slot support;

A number of cross beams are connected to the top of the portal bracket through the slot support, and one end thereof extends out of the floor to form a cantilevered section. The cross beams are arranged parallel to each other to support the weight of the cantilevered board. ;

The first bracket is provided at the end of the cantilevered section of the crossbeam and is used to support the edge beam on the outside of the cantilevered plate;

The diagonal tie rod is arranged obliquely relative to the floor. One end of the diagonal tie rod is connected to the top of the vertical member near the outside of the floor, and the other end is anchored to the floor to increase the stability of the portal bracket.

Further, the slot support includes a slot, a screw and a nut. One end of the screw is connected to the bottom of the slot, and the other end is threadedly connected to the vertical member. The nut is sleeved on the slot. The screw is used to adjust and lock the height of the slot support.

Furthermore, a second bracket is provided in the middle of the cantilevered section of the crossbeam for supporting the cantilevered plate.

Furthermore, both the first bracket and the second bracket are height-adjustable.

Further, it also includes a prestressed tie rod, which is installed vertically on the floor. The upper end of the prestressed tie rod is connected to the end of the cross beam close to the slot support, and the lower end is anchored in the floor.

Further, a tension adjuster is provided on the pre-tensioned pull rod to adjust the pulling force of the pre-tensioned pull rod on the vertical member.

Further, it also includes a stay cable, one end of the stay cable is connected to the end of the cantilevered section of the cross beam, and the other end is anchored on the outside of the floor slab for balancing the force of the prestressed tie rod.

The invention also provides a cantilever plate installation method using the above support, which includes the following steps:

S1. Install the portal bracket on the inside of the floor, install the diagonal tie rod arranged at an angle, so that one end of the diagonal tie rod is connected to the top of the vertical member near the outside of the floor, and the other end is anchored on the floor;

S2. Adjust the height of the slot support on the top of the portal bracket and install the cross beam; plug one end of the cross beam into the slot support and the other end extends out of the floor to form a cantilever of a certain length. section, install the first bracket at the end of the cantilevered section;

S3. Hoist the inner frame beam on one end of the beam located on the portal bracket, so that the frame beam itself serves as the ballast of the beam;

S4. Hoist the cantilever plate on the cantilever section of the beam, and the edge beam of the cantilever plate is against the first bracket;

S5. Pour the cast-in-place concrete layer and complete the construction of the cantilever plate; after a certain period of time, remove the portal bracket and the diagonal tie rod.

As an embodiment, the step S2 also includes installing the second bracket in the middle of the cantilevered section of the crossbeam; the step S4 further includes abutting the body of the cantilevered plate against the cantilevered section. on the second bracket.

As another embodiment, the step S2 also includes: installing a prestressed tie rod connecting the inner end of the crossbeam and the floor, adjusting the tension of the prestressed tierod according to design requirements; installing and connecting the cantilevered section end of the crossbeam. cables between the bottom and the outside of the floor.

Compared with the existing technology, the present invention has the following beneficial technical effects:

(1) The support frame of the present invention eliminates the need for a high support frame set up under the overhanging plate by arranging extended beams, saving material costs and reducing operation risks; by arranging adjustable slot supports , which is conducive to the disassembly and assembly of cross beams and height adjustment, improving construction efficiency; the diagonal tie rods can increase the overall stability of the support frame and prevent it from overturning outwards.

(2) The support frame of the present invention can also include pre-tensioned pull rods and cables, which further ensures that the forces on both sides of the portal support are balanced and the overall structure is stable and reliable.

(3) The cantilever plate installation method provided by the present invention directly sets up the support frame of the cantilever plate on the floor. The steps are simple, the construction is fast, and the labor cost and construction period cost are effectively saved.

Description of drawings

Figure 1 is a schematic structural diagram of the support frame of a prefabricated building cantilever panel according to the present invention;

Figure 2 is a slot support structure of a support frame for a prefabricated building cantilever panel according to the present invention;

Figure 3 is a schematic structural diagram of the support frame of another prefabricated building cantilever panel according to the present invention.

Among them: 1-portal bracket; 101-transverse member; 102-vertical member; 2-slot support; 201-slot; 202-screw; 203-nut; 3-beam; 4-first bracket; 5-diagonal tie rod; 6-second bracket; 7-prestressed tie rod; 701-tension adjuster; 8-stay cable; 9-floor slab; 10-cantilever plate; 11-frame beam.

Detailed ways

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways that are different from those described here. Those skilled in the art can make similar extensions without violating the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

Example 1

Referring to Figures 1 and 2, this embodiment provides a support frame for a prefabricated building cantilever panel, which includes a portal bracket 1 located inside the floor slab 9. The portal bracket 1 is composed of a number of transverse members 101 and a number of vertical members. 102 composition. The horizontal member 101 and the vertical member 102 adopt a socket and fastener type connection method, which can realize the rapid disassembly and assembly of the portal bracket 1 and improve the operating efficiency. Both the transverse member 101 and the vertical member 102 are made of steel pipes with a module size of 300 mm or 500 mm, which is conducive to standardized production and improves the turnover rate of steel pipe members.

In order to increase the stability of the portal bracket 1, the top of the vertical member 102 of the portal bracket 1 close to the outside of the floor plate 9 is connected to the diagonal tie rod 5. The other end of the diagonal tie rod 5 is anchored in the floor plate 9 so that it is connected with the portal bracket 1 and The floor slab 9 forms a triangular structure to prevent the portal bracket 1 from overturning due to uneven stress.

The top of the portal bracket 1 is provided with a height-adjustable slot support 2. The slot support 2 includes a slot 201, a screw 202 and a nut 203. One end of the screw 202 is connected to the bottom of the slot 201, and the other end is connected to the bottom of the slot 201. Threadedly connected to the vertical member 102, the nut 203 is set on the screw rod 202 for adjusting and locking the height of the slot support 2. A number of cross beams 3 are plugged into the top of the portal bracket 1 through the slot supports 2, and one end thereof extends out of the floor 9 to form a cantilever section of a certain length to support the weight of the cantilever plate 10. The cross beams 3 are arranged parallel to each other to evenly carry the cantilever plate 10 to disperse the pressure of each cross beam 3, which is beneficial to the stability of the installation of the cantilever plate 10. Specifically, the cross beam 3 can be made of I-beam steel or channel steel according to actual conditions but is not limited thereto. In order to further increase the stability of the portal bracket 1, a ballast device can be added to the end of the beam 3 close to the floor 9 to strengthen the vertical pressure of the portal bracket 1. Sandbags, pressure blocks, etc. can be used to reset the ballast. Quality items.

The end of the cantilever section of the cross beam 3 is provided with a first bracket 4 that supports the edge beam outside the cantilever plate 10, and a second bracket 6 is provided in the middle of the cantilever section to shorten the force arm generated by the self-weight of the cantilever plate 10. , reducing the overturning moment of the cantilever plate 10, making the support frame safer and more reliable. Both the first bracket 4 and the second bracket 6 are height-adjustable in order to adjust the height according to the specific size of the cantilever plate 10 and improve construction efficiency. Specifically, the adjustable setting can use additional pads or small jacks.

The installation method of the cantilever plate using the support frame provided in this embodiment is as follows:

S1. Install the portal bracket 1 on the inside of the floor 9, and install the inclined tie rod 5 so that one end of the tie rod 5 is connected to the top of the vertical member 102 near the outside of the floor 9, and the other end is anchored on the floor 9;

S2. Adjust the height of the slot support 2 on the top of the portal bracket 1, and install the cross beam 3; insert one end of the cross beam 3 into the slot support 2, and the other end extends out of the floor 9 to form a cantilever section of a certain length. Install the first bracket 4 at the end of the overhang section, and install the second bracket 6 at the middle of the overhang section;

S3. Hoist the inner frame beam 11 on one end of the beam 3 located on the portal bracket 1, so that the frame beam 11 itself acts as the ballast of the beam 3;

S4. Hoist the cantilever plate 10 on the cantilever section of the cross beam 3, the edge beam of the cantilever plate 10 is against the first bracket 4, and the body of the cantilever plate 10 is against the second bracket 6;

S5. Pour the cast-in-place concrete layer and complete the construction of the cantilever plate 10; after the concrete reaches the fixed age, remove the portal bracket 1 and the diagonal tie rod 5.

Example 2

Referring to Figure 3, this embodiment provides another device-type cantilever plate support frame, which is different from the structure of Embodiment 1 in that it also includes:

The prestressed tie rod 7 is installed vertically on the floor 9. The upper end of the prestressed tie rod 7 is connected to the end of the crossbeam 3 close to the slot support 2, and the lower end is anchored in the floor 9 to improve the vertical pull of the portal bracket 1. The knot force prevents the portal bracket 1 from overturning outwards. A tension adjuster 701 is provided on the pre-tension rod 7 to adjust the pulling force of the pre-tension rod 7 on the vertical member 102 at any time.

One end of the stay cable 8 is connected to the end of the cantilevered section of the cross beam 3, and the other end is anchored on the outside of the floor slab 9 to balance the force of the prestressed tie rod 7. When the prefabricated frame beam 11 is hoisted in place, a downward force will be exerted on the overhanging end of the cross beam 3, and the force of the cable 8 will be reduced to zero.

The difference between the cantilever plate installation method using the support frame provided in this embodiment and the steps in Embodiment 1 is:

S2. Adjust the height of the slot support 2 on the top of the portal bracket 1, and install the cross beam 3; insert one end of the cross beam 3 into the slot support 2, and the other end extends out of the floor 9 to form a cantilever section of a certain length. Install the first bracket 4 at the end of the cantilevered section, and the second bracket 6 at the middle of the cantilevered section; install the prestressed tie rod 7 connecting the inner end of the cross beam 3 and the floor slab 9, and adjust the prestressed tie rod 7 according to the design requirements. The tensile force; install the cable 8 connecting the end of the cantilevered section of the cross beam 3 and the outside of the floor slab 9.

The steps of other structures and installation methods are the same as those in Embodiment 1, and will not be repeated here.

Finally, it should be noted that the above are only preferred embodiments 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 the embodiments, those skilled in the art can still make changes to the foregoing. The technical solutions described in each embodiment may be modified, or some of the technical features may be equivalently substituted. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (2)

1. An installation method of prefabricated building cantilever panels, characterized in that the support frame of the prefabricated building cantilever panels includes: The portal bracket is composed of several transverse members and several vertical members. The top of the portal bracket is provided with a height-adjustable slot support; A plurality of cross beams, the cross beams are connected to the top of the portal bracket through the slot support, one end of which extends out of the floor to form a cantilevered section, and the cross beams are arranged parallel to each other on the horizontal plane; The first bracket is located at the end of the cantilevered section of the beam; The diagonal tie rod is arranged obliquely relative to the floor. One end of the diagonal tie rod is connected to the top of the vertical member near the outside of the floor, and the other end is anchored on the floor. The slot support includes a slot, a screw rod and a nut. One end of the screw is connected to the bottom of the slot, and the other end is threadedly connected to the vertical member. The nut is set on the screw. It also includes: a second bracket, cantilevered on the crossbeam. In the middle of the section, the first bracket and the second bracket are height-adjustable, and also include: a pre-tension rod, which is vertically installed on the floor, and the upper end of the pre-tension rod is close to the slot. The end of the cross beam of the support is connected, and the lower end is anchored in the floor. The prestressed pull rod is provided with a tension adjuster to adjust the pull force of the prestressed pull rod on the vertical member, and also includes: a cable , one end of the stay cable is connected to the end of the cantilevered section of the beam, and the other end is anchored on the outside of the floor slab; The installation method of the prefabricated building cantilever panel includes the following steps: S1. Install the portal bracket on the inside of the floor, install the diagonal tie rod arranged at an angle, so that one end of the diagonal tie rod is connected to the top of the vertical member near the outside of the floor, and the other end is anchored on the floor; S2. Adjust the height of the slot support at the top of the portal bracket and install the cross beam; plug one end of the cross beam into the slot support and the other end extends out of the cantilevered section formed outside the floor. Installing the first bracket at the end of the cantilevered section; it also includes: installing a prestressed tie rod connecting the inner end of the crossbeam and the floor, adjusting the tension of the prestressed tierod; installing and connecting the cantilevered section of the crossbeam The cable ends and the outside of the slab; S3. Hoist the inner frame beam on one end of the beam located on the portal bracket, so that the frame beam itself serves as the ballast of the beam; S4. Hoist the cantilever plate on the cantilever section of the beam, and the edge beam of the cantilever plate is against the first bracket; S5. Pour the cast-in-place layer of concrete to complete the construction of the cantilever plate; after the concrete hardens, remove the portal bracket and the diagonal tie rod. 2. The installation method of prefabricated building cantilever panels according to claim 1, characterized in that: in step S2, it also includes installing the second bracket in the middle of the cantilevered section of the beam; The step S4 also includes the step of abutting the body of the overhanging plate against the second bracket.