Method for installing a steel beam for reinforcing and repairing a public building

Abstract

The application discloses a kind of public building maintenance reinforcing steel beam installation method, comprising the following steps: step one, install comb-tooth steel plate on the surface of original structure beam, form original structure beam reformation piece;Step two, the middle part of steel beam is sent and lifted using steel beam installation trolley, and the installation position of the end of steel beam and the end of original structure beam reformation piece at both ends is opposite;Step three, connecting steel plate is welded at both ends of steel beam, and connecting steel plate is fixed with original structure beam reformation piece by anchor bolt.The present application ensures that steel beam can be safely and orderly during installation, prevents falling safety risk during steel beam lifting, and improves the quality of the whole beam after reinforcement.

Description

Technical Field

[0001] This invention relates to the field of transportation and installation of steel beams for adding to existing floors and roofs during the repair, reinforcement, and renovation of public buildings. More specifically, this invention relates to a method for installing steel beams for the repair and reinforcement of public buildings. Background Technology

[0002] In building structures, beams and slabs together form the floor and roof structures. Beams are generally placed horizontally and are mainly used to bear bending moments and shear forces under load. When a building needs to be renovated, existing beams need to be reinforced or steel beams need to be added to ensure the safe use of the building. Figure 1 As shown, during the construction of adding steel beams to existing buildings, due to space constraints, large lifting equipment cannot be used. The common method is to weld steel beams in a "well" shape and insert both ends of the steel beams into shear walls or structural beams with high-strength chemical anchors to form a reaction frame for lifting the steel beams. This type of steel beam installation process is complex and can cause certain damage to existing components, increasing production costs and the probability of accidents. Therefore, there is still considerable room for improvement in the current installation of steel beams in terms of construction safety, efficiency, quality assurance, and cost reduction. Summary of the Invention

[0003] The purpose of this invention is to provide a method for the rapid installation of reinforced steel beams without damaging existing components, so as to ensure that the installation of steel beams can be carried out safely and orderly, while improving production efficiency and reducing production costs.

[0004] The technical solution adopted by this invention to solve this technical problem is: a method for installing steel beams for the repair and reinforcement of public buildings, comprising the following steps:

[0005] Step 1: Install comb-shaped steel plates on the surface of the original structural beam to form the modified component of the original structural beam;

[0006] Step 2: Use a steel beam installation trolley to transport and lift the middle part of the steel beam and align the beam ends with the installation positions of the original structural beam modification components at both ends.

[0007] Step 3: Connecting steel plates are welded to both ends of the steel beam, and the connecting steel plates are fixed to the original structural beam modification component by anchor bolts.

[0008] Preferably, the steel beam installation trolley includes: a horizontal travel system, a travel track system, an automatic lifting system, and a vertical transport system;

[0009] The horizontal walking system has wheels at the bottom;

[0010] The walking track system includes a portal frame and vertical tracks symmetrically arranged on both sides of the portal frame; the lower part of the portal frame is fixed to the horizontal walking system through a first height adjustment plate, and the first height adjustment plate is provided with a plurality of threaded holes spaced apart along the height direction.

[0011] The vertical transport system is installed on a vertical track and can be raised and lowered. The vertical transport system is used to support and lift the steel beam.

[0012] The automatic lifting system includes a winch, a first steering seat, a second steering seat, and a hook. The winch is installed on the horizontal travel system, the first steering seat is installed on the horizontal travel system located below the portal frame, and the second steering seat is installed on the top of the portal frame. The end of the winch's wire rope passes through the first steering seat and the second steering seat in sequence and is connected to the hook. A hanging device is installed on the vertical transport system, and the hook is hung on the hanging device. The winch provides the power for the vertical movement of the vertical transport system.

[0013] Preferably, the portal frame is provided with horizontal braces at intervals along the height direction;

[0014] The vertical transport system package is a frame structure, and pulleys are installed at both ends of the vertical transport system at a certain distance and are slidably connected to the vertical track.

[0015] Preferably, step one specifically comprises:

[0016] S11. Remove the plaster layer from the surface of the original structural beam, then grind the surface of the original structural beam to remove 1-3mm of its surface, maintaining the smoothness of the grinding. Fix the comb-shaped steel plate to the ground surface of the original structural beam by injecting adhesive. Set the bottom load-bearing steel plate on the bottom surface of the original structural beam, which is fixed to the bottom surface of the original structural beam by injecting adhesive. The density of the adhesive should meet the following requirements: the density should not be less than 90% in the anchoring area and not less than 70% in the non-anchoring area; the distance between the comb-shaped steel plate and the bottom load-bearing steel plate and the surface of the original structural beam should be 1-3mm.

[0017] S12. Perform surface protection treatment by applying cement mortar to the surface of the load-bearing steel plate at the bottom of the beam and the surface of the comb-shaped steel plate for protection.

[0018] Preferably, in S12, a layer of lead wire or a layer of fine stone is bonded to the comb-shaped steel plate and the load-bearing steel plate at the bottom of the beam, and a layer of concrete interface agent is applied during plastering.

[0019] Preferably, the connecting steel plate in step three is an L-shaped plate.

[0020] Preferably, the comb-shaped steel plate and the load-bearing steel plate at the bottom of the beam are welded together.

[0021] Preferably, in step two, after the steel beam is positioned by the steel beam installation trolley, steel beam installation trolleys are also set at both ends of the steel beam, and the ends of the steel beam extend out of the vertical transport system, which supports the two ends and the middle of the steel beam.

[0022] Preferably, an extension platform is installed on the vertical transport system of the installation trolleys located at both ends of the steel beam, and the extension platform extends below the original structural beam.

[0023] Ear plates are welded to both sides near both ends of the steel beam;

[0024] An auxiliary clamp is installed between step two and step three. The auxiliary clamp includes: a first rod, a second rod, a spring, a lifting component, a bolt plate, a fixed base, and a sliding base.

[0025] Both the first and second rods are L-shaped structures, symmetrically arranged and connected by a spring. The bottom of the first rod is fixedly connected to the extension platform via a fixed base, and the bottom of the second rod is slidably connected to the extension platform via a sliding base. The upper end of the first rod is pressed against the first side of the original structural beam by a lifting member. The upper end of the second rod is connected to a bolted plate. The bolted plate is connected to the ear plates on both sides of the steel beam by bolts to connect the bolted plate and the steel beam into a whole.

[0026] In step three, after the steel beam is fixed to the original structural beam, the connection between the bolt plate and the ear plate is released, the lifting component retracts, and the auxiliary clamp is removed.

[0027] This invention offers at least the following advantages: It modifies currently used steel beam reinforcement and installation methods by creating a steel beam installation trolley through the fabrication of a horizontal walking system, a height adjustment system, an automatic lifting system, a walking track system, and a vertical transportation system. This allows the steel beam to be installed to be lifted, adjusted, and installed to the designated position from bottom to top without damaging existing components. A track is installed inside the trolley frame, and a fall arrestor is installed within the track to ensure that the steel beam installation meets the design drawings and to prevent the risk of falling during the lifting process. The connection between the steel beam and the original structural beam via anchor bolts causes significant stress concentration, resulting in high residual tensile stress in the beam. Therefore, before inserting the anchor bolts, auxiliary clamps are installed between the steel beam and the original structural beam, and springs release some of the stress, reducing residual stress and thus improving the fatigue life of the entire beam.

[0028] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the newly added steel beam node in the existing technology;

[0030] Figure 2 This is a bottom view of the original structural beam and steel beam connection of the present invention;

[0031] Figure 3 This is a schematic diagram of the comb-shaped steel plate of the present invention installed on the surface of the original structural beam;

[0032] Figure 4 This is a schematic diagram of the steel beam installation trolley structure;

[0033] Figure 5 This is a schematic diagram of the auxiliary clamping component structure;

[0034] Figure 6 This is a picture of the steel beam being lifted by the steel beam installation trolley.

[0035] Explanation of reference numerals in the attached drawings: 1 Original structural beam, 2 Steel beam, 3 Comb-shaped steel plate, 41 Horizontal walking system, 421 Portal frame, 422 Vertical track, 423 First height adjustment plate, 424 Horizontal brace, 43 Vertical transportation system, 441 Winch, 442 First steering seat, 443 Second steering seat, 444 Hook, 445 Wire rope, 5 Extension platform, 6 Ear plate, 71 First rod, 72 Second rod, 73 Spring, 74 Lifting component, 75 Bolted plate, 76 Fixed base, 77 Sliding base. Detailed Implementation

[0036] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in various parts of the present invention, including the following description, can be combined with each other without conflict.

[0037] Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0039] like Figures 2-3 and Figure 6 As shown, the present invention provides a method for installing a steel beam 2 for the repair and reinforcement of a public building, comprising the following steps:

[0040] Step 1: Install comb-shaped steel plate 3 on the surface of the original structural beam 1 to form the modified part of the original structural beam 1;

[0041] Step 2: Use the steel beam 2 installation trolley to transport and lift the middle part of the steel beam 2 and align the beam ends of the steel beam 2 with the installation positions of the original structural beam 1 modification parts at both ends;

[0042] Step 3: Connecting steel plates are welded to both ends of steel beam 2, and the connecting steel plates are fixed to the original structural beam 1 modification component by anchor bolts.

[0043] This technical solution may also include the following technical details to better achieve the technical effect: such as Figure 4 As shown, the steel beam 2 installation trolley includes: a horizontal walking system 41, a walking track system, an automatic lifting system, and a vertical transportation system 43;

[0044] The horizontal walking system 41 has wheels at its bottom;

[0045] The walking track system includes a portal frame 421 and vertical tracks 422 symmetrically arranged on both sides of the portal frame 421; the lower part of the portal frame 421 is fixed to the horizontal walking system 41 through a first height adjustment plate 423, and the first height adjustment plate 423 is provided with a plurality of threaded holes spaced apart along the height direction, and the portal frame 421 is connected to the different threaded holes of the first height adjustment plate 423 to realize the height adjustment of the portal frame 421;

[0046] The vertical transport system 43 is installed on the vertical track 422 and can be raised and lowered. The vertical transport system 43 is used to support and lift the steel beam 2.

[0047] The automatic lifting system includes a winch 441, a first steering seat 442, a second steering seat 443, and a hook 444. The winch 441 is mounted on a horizontal travel system 41. The first steering seat 442 is mounted on the horizontal travel system 41 located below the portal frame 421. The second steering seat 443 is mounted on the top of the portal frame 421. The end of the wire rope 445 of the winch 441 passes through the first steering seat 442 and the second steering seat 443 in sequence and is connected to the hook 444. A hanging device is installed on the vertical transport system 43, and the hook 444 is hung on the hanging device. The winch 441 provides the power for the vertical movement of the vertical transport system 43.

[0048] This technical solution may also include the following technical details to better achieve the technical effect: the portal frame 421 is provided with horizontal braces 424 at intervals along the height direction to improve the stability of the portal frame 421 structure;

[0049] The vertical transport system 43 is a frame structure. Both ends of the vertical transport system 43 extend horizontally at a certain distance and are equipped with pulleys that are slidably connected to the vertical rail 422. In this embodiment, the vertical transport system 43 is made of two sets of U-shaped steel welded perpendicularly to each other. The two sets of U-shaped steel are connected and fixed by diagonal braces to increase the support strength and stability of the vertical transport system 43.

[0050] This technical solution may also include the following technical details to better achieve the technical effect: Step one specifically includes:

[0051] S11. Remove the plaster layer from the surface of the original structural beam 1, then grind the surface of the original structural beam 1 to remove 1-3mm of its surface, maintaining the smoothness of the grinding. Fix the comb-shaped steel plate 3 to the ground surface of the original structural beam 1 by injecting adhesive (the base surface should be clean and free of water before injecting adhesive). Set the bottom load-bearing steel plate on the bottom surface of the original structural beam 1, which is fixed to the bottom surface of the original structural beam 1 by injecting adhesive. The density of the adhesive injection should meet the following requirements: the density should not be less than 90% in the anchoring area and not less than 70% in the non-anchoring area; the distance between the comb-shaped steel plate 3 and the bottom load-bearing steel plate and the surface of the original structural beam 1 should be 1-3mm.

[0052] S12. Perform surface protection treatment by applying cement mortar to the surface of the load-bearing steel plate at the bottom of the beam and the surface of the comb-shaped steel plate 3 for protection.

[0053] This technical solution may also include the following technical details to better achieve the technical effect: When the areas of the comb-shaped steel plate 3 and the bottom load-bearing steel plate are large, in S12, a layer of lead wire steel or a layer of fine stone is glued to the comb-shaped steel plate 3 and the bottom load-bearing steel plate, and a layer of concrete interface agent is applied during plastering.

[0054] This technical solution may also include the following technical details to better achieve the technical effect: the connecting steel plate in step three is an L-shaped plate.

[0055] This technical solution may also include the following technical details to better achieve the technical effect: welding and fixing between the comb-shaped steel plate 3 and the load-bearing steel plate at the bottom of the beam.

[0056] This technical solution may also include the following technical details to better achieve the technical effect: In order to avoid stress lag after the steel beam 2 is installed, after the steel beam 2 is positioned by the steel beam 2 installation trolley in step two, steel beam 2 installation trolleys are also set at both ends of the steel beam 2, and the ends of the steel beam 2 extend out of the vertical transport system 43. The vertical transport system 43 supports the two ends and the middle of the steel beam 2, so that the steel beam 2 bears a uniformly distributed load and achieves multi-point uniform support.

[0057] This technical solution may also include the following technical details to better achieve the technical effect: such as Figure 5As shown, an extension platform 5 is installed on the vertical transport system 43 of the installation trolley located at both ends of the steel beam 2. The extension platform 5 extends below the original structural beam 1.

[0058] Ear plates 6 are welded to both sides near both ends of the steel beam 2;

[0059] An auxiliary clamp is installed between step two and step three. The auxiliary clamp includes: a first rod 71, a second rod 72, a spring 73, a lifting member 74, a bolt plate 75, a fixed base 76, and a sliding base 77.

[0060] Both the first rod 71 and the second rod 72 are L-shaped structures. The first rod 71 and the second rod 72 are symmetrically arranged and connected by a spring 73. The bottom of the first rod 71 is fixedly connected to the extension platform 5 through a fixed base 76. The bottom of the second rod 72 is slidably connected to the extension platform 5 through a sliding base 77. The upper end of the first rod 71 is pressed against the first side of the original structural beam 1 and the steel beam 2 opposite to it through a lifting member 74. The lifting member 74 is composed of a hydraulic cylinder and a connecting plate. The connecting plate is pressed against the first side of the original structural beam 1. The upper end of the second rod 72 is connected to a bolted plate 75. The bolted plate 75 is connected to the ear plates 6 on both sides of the steel beam 2 by bolts to connect the bolted plate 75 and the steel beam 2 into a whole.

[0061] In step three, after the steel beam 2 is fixed to the original structural beam 1, the connection between the bolt plate 75 and the ear plate 6 is released, the lifting member 74 retracts, and the auxiliary clamp is removed.

[0062] During the process of connecting steel beam 2 with the original structural beam 1 by driving in anchor bolts, a large stress concentration will occur, resulting in high residual tensile stress in the beam. Therefore, before driving in the anchor bolts, an auxiliary clamp is set between steel beam 2 and the original structural beam 1, and some stress is released by spring 73 to reduce residual stress, thereby improving the fatigue life of the entire beam.

[0063] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A method for installing steel beams for the repair and reinforcement of public buildings, characterized in that, Includes the following steps: Step 1: Install comb-shaped steel plates on the surface of the original structural beam to form a modified component of the original structural beam; Step 1 specifically involves: S11. Remove the plaster layer from the surface of the original structural beam, then grind the surface of the original structural beam to remove 1-3mm of its surface, maintaining the smoothness of the grinding. Fix the comb-shaped steel plate to the ground surface of the original structural beam by injecting adhesive. Set the bottom load-bearing steel plate on the bottom surface of the original structural beam, which is fixed to the bottom surface of the original structural beam by injecting adhesive. The density of the adhesive should meet the following requirements: the density should not be less than 90% in the anchoring area and not less than 70% in the non-anchoring area; the distance between the comb-shaped steel plate and the bottom load-bearing steel plate and the surface of the original structural beam should be 1-3mm. S12. Perform surface protection treatment by applying cement mortar to the surface of the load-bearing steel plate at the bottom of the beam and the surface of the comb-shaped steel plate for protection. Step 2: Use a steel beam installation trolley to transport and lift the middle section of the steel beam, aligning the ends of the steel beam with the installation positions of the original structural beam modification components at both ends. The steel beam installation trolley includes: a horizontal walking system, a walking track system, an automatic lifting system, and a vertical transportation system. After the steel beam is positioned by the steel beam installation trolley, steel beam installation trolleys are also set at both ends of the steel beam, with the ends of the steel beam extending out of the vertical transportation system, which supports the ends and middle section of the steel beam. Step 3: Connecting steel plates are welded to both ends of the steel beam, and the connecting steel plates are fixed to the original structural beam modification component by anchor bolts; An extension platform is installed on the vertical transport system of the installation trolleys located at both ends of the steel beam, and the extension platform extends below the original structural beam; ear plates are welded to both sides of the steel beam near both ends; The installation auxiliary clamp includes: a first rod, a second rod, a spring, a lifting member, a bolted plate, a fixed base, and a sliding base; Both the first and second rods are L-shaped structures, symmetrically arranged and connected by a spring. The bottom of the first rod is fixedly connected to the extension platform via a fixed base, and the bottom of the second rod is slidably connected to the extension platform via a sliding base. The upper end of the first rod is pressed against the first side of the original structural beam by a lifting member. The upper end of the second rod is connected to a bolted plate. The bolted plate is connected to the ear plates on both sides of the steel beam by bolts to connect the bolted plate and the steel beam into a whole. After the steel beam is fixed to the original structural beam, the connection between the bolt plate and the ear plate is released, the lifting component retracts, and the auxiliary clamp is removed.

2. The method for installing steel beams for the repair and reinforcement of public buildings as described in claim 1, characterized in that, The horizontal walking system has wheels at the bottom; The walking track system includes a portal frame and vertical tracks symmetrically arranged on both sides of the portal frame; the lower part of the portal frame is fixed to the horizontal walking system through a first height adjustment plate, and the first height adjustment plate is provided with a plurality of threaded holes spaced apart along the height direction. The vertical transport system is installed on a vertical track and can be raised and lowered. The vertical transport system is used to support and lift the steel beam. The automatic lifting system includes a winch, a first steering seat, a second steering seat, and a hook. The winch is installed on the horizontal travel system, the first steering seat is installed on the horizontal travel system located below the portal frame, and the second steering seat is installed on the top of the portal frame. The end of the winch's wire rope passes through the first steering seat and the second steering seat in sequence and is connected to the hook. A hanging device is installed on the vertical transport system, and the hook is hung on the hanging device. The winch provides the power for the vertical movement of the vertical transport system.

3. The method for installing steel beams for the repair and reinforcement of public buildings as described in claim 2, characterized in that, The portal frame is provided with horizontal braces spaced at intervals along the height direction; The vertical transport system package is a frame structure, and pulleys are installed at both ends of the vertical transport system at a certain distance and are slidably connected to the vertical track.

4. The method for installing steel beams for the repair and reinforcement of public buildings as described in claim 1, characterized in that, In S12, a layer of lead wire or a layer of fine stone is bonded to the comb-shaped steel plate and the load-bearing steel plate at the bottom of the beam, and a layer of concrete interface agent is applied during plastering.

5. The method for installing steel beams for the repair and reinforcement of public buildings as described in any one of claims 1 to 4, characterized in that, The connecting steel plate in step three is an L-shaped plate.

6. The method for installing steel beams for the repair and reinforcement of public buildings as described in claim 1, characterized in that, The comb-shaped steel plate and the load-bearing steel plate at the bottom of the beam are welded and fixed together.

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