Upper bearing truss structure and transformation method for the transformation of reinforced concrete structural beams

Abstract

The present invention discloses a top chord truss structure and a renovation method for the renovation of reinforced concrete structural beams, which includes arranging at least two lower chord beams and two upper chord beams closely above the floor slab; multiple lower horizontal tie rods are arranged between every two adjacent lower chord beams; multiple upper horizontal tie rods are arranged between every two adjacent upper chord beams; multiple vertical web members are arranged between each lower chord beam and the corresponding upper chord beam located above; diagonal web members are arranged between every two vertical web members; multiple lower hanging suspension rods are arranged between each lower chord beam and the structural beam; each lower hanging suspension rod and the structural beam are fixed through matching shear pin holes and shear pins. During construction, the main part of the top chord truss structure is first formed by welding; then all the perforations are opened; then all the lower hanging suspension rods are set, and finally the middle columns are cut off. The present invention does not require any concrete pouring operation, and on the premise of meeting the requirements of low reinforcement, it will not reduce the net clear height of the original structural beam, and the construction is more convenient, more low-carbon and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of the transformation of reinforced concrete structural beams, and particularly to a top chord truss structure and a transformation method for the transformation of reinforced concrete structural beams. Background Art

[0002] After a building with a reinforced concrete frame structure form has been in use for a certain number of years, the building layout may need to be adjusted due to changes in building functions. For example, the original equipment room needs to be adjusted to a large passenger flow passage, and the original data archive room needs to be adjusted to a large open exhibition hall, etc. Some existing structural columns need to be removed to obtain a larger structural span and a better use space. Structural columns are key components supporting the building. In order to avoid the collapse and damage of the structural beams supported by the structural columns due to the lack of support, it is necessary to reinforce and transform the structural beams before the structural columns are removed.

[0003] In the prior art, in the case of removing the middle columns of the structural beams in a building, the methods for reinforcement and transformation mainly include the method of increasing the cross-sectional area, the method of pasting steel plates for reinforcement, the method of pasting fiber composite materials for reinforcement, etc.

[0004] Among them, the method of increasing the cross-sectional area not only needs to increase the height under the beam, affecting the original clear height under the beam, but also needs to pour reinforced concrete again, and it is difficult to have construction conditions in a building that has been put into operation;

[0005] If the method of pasting steel plates for reinforcement or the method of pasting fiber composite materials for reinforcement is used, according to the limitations of industry specifications, the bearing capacity of the structural beam cannot be increased by more than 40%, and it often cannot meet the strengthening requirements of the components after removing the middle columns.

[0006] Therefore, in the reinforcement project of reinforced concrete structural beams with middle columns removed, how to meet the low reinforcement requirements, without reducing the clear height of the original structural beam, and also being able to reduce the construction difficulty and carbon emissions. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a top chord truss structure and a transformation method for the transformation of reinforced concrete structural beams, and the purpose achieved is to realize a transformation construction method that does not require the pouring of reinforced concrete, does not reduce the original clear height under the beam, and is convenient and fast in construction, and can solve the thorny problems in the reinforcement project of reinforced concrete structural beams with middle columns removed in the prior art.

[0008] To achieve the above purpose, the present invention discloses a top chord truss structure for the transformation of reinforced concrete structural beams, which is arranged above the structural beam to be strengthened, with a floor slab spaced between it and the structural beam, and includes at least two lower chord beams arranged closely on the upper surface of the floor slab, and upper chord beams arranged above the vertical projection direction of each lower chord beam;

[0009] Multiple lower horizontal tie rods are provided between every two adjacent lower chord beams;

[0010] Multiple upper horizontal tie rods are provided between every two adjacent upper chord beams;

[0011] Multiple vertical web members are provided between each lower chord beam and the corresponding upper chord beam located above it;

[0012] Diagonal web members are provided between every two vertical web members;

[0013] Multiple lower hanging suspension rods are provided between each lower chord beam and the structural beam;

[0014] Stamp holes penetrating the floor slab are provided at the positions of the floor slab corresponding to each lower hanging suspension rod;

[0015] Each lower hanging suspension rod is fixed to the structural beam through matching shear pin holes and shear pins;

[0016] The lengths of all the lower chord beams and all the upper chord beams cover a range of at least 1.2 meters outside the two structural columns that still remain after the transformation of the part of the structural beam that needs to be strengthened.

[0017] Preferably, the spacing between every two adjacent lower hanging suspension rods is not less than 400 millimeters;

[0018] The depth of each shear pin hole is 120 millimeters ± 5%, the distance from the lower surface of the floor slab is not less than 150 millimeters, and the distance from the lower surface of the structural beam is not less than 300 millimeters.

[0019] Preferably, the gap between each stamp hole and the corresponding lower hanging suspension rod is filled with polyurethane building sealant.

[0020] The present invention also provides a method for reconstructing a reinforced concrete structural beam using the above-mentioned upper-bearing truss structure for reconstructing a reinforced concrete structural beam, including the following steps:

[0021] Step 1: Weld all the lower chord beams, all the upper chord beams, all the lower horizontal tie rods, all the upper horizontal tie rods, all the vertical web members, and all the diagonal web members together on the upper surface of the floor slab above the part of the structural beam that needs to be strengthened by welding to form the main body part of the upper-bearing truss structure;

[0022] Step 2: Open all the stamp holes for passing through the lower hanging suspension rods on the floor slab according to the design requirements;

[0023] Step 3: Open all the shear pin holes in the part of the structural beam that needs to be strengthened;

[0024] Step 4: Install the corresponding hanging rods in each of the stamp holes, and fix the upper ends of each of the hanging rods to the corresponding lower chord beams;

[0025] Install the corresponding shear pins at the lower ends of each of the hanging rods, and fix each of the hanging rods to the structural beam by setting the corresponding shear pins into the corresponding shear pin holes;

[0026] Step 5: Cut off the middle struts located at the middle positions of the parts of the structural beam that need to be strengthened according to the design requirements;

[0027] Step 6: Fill the gaps between each of the stamp holes and the corresponding hanging rods with polyurethane building sealant.

[0028] Preferably, after completing Step 6, apply anti-corrosion measures to all exposed steel structure members.

[0029] Advantages of the present invention:

[0030] The present invention does not require any concrete pouring operations and can be implemented according to the prefabricated assembly construction mode. On the premise of meeting the requirements of low reinforcement, it will not reduce the clear height of the original structural beam, and the construction is more convenient, more low-carbon and environmentally friendly.

[0031] In the present invention, the newly added structural members have the same life cycle as the main structure, and the structural durability is better.

[0032] In the present invention, the net height under the structural beam is the same as that before the transformation, the building space is open, and the use function is better.

[0033] In the present invention, the self-weight of the newly added structural members is light, and the load on the existing structure is smaller.

[0034] After the transformation using the present invention, the bearing capacity of the structural beam is significantly improved, easily breaking through the limits of the bonded steel plate reinforcement method and the bonded fiber composite material reinforcement method.

[0035] The following will further illustrate the concept, specific structure and technical effects generated by the present invention with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0036] Figure 1 Schematic diagram showing a reinforced concrete structural beam without transformation according to an embodiment of the present invention.

[0037] Figure 2 Schematic diagram showing a reinforced concrete structural beam after completion of the transformation according to an embodiment of the present invention.

[0038] Figure 3 Showing the present invention Figure 2 Schematic cross-sectional structure diagram in the AA direction. Detailed implementation mode

[0039] Embodiment

[0040] As Figure 2 And Figure 3 As shown, a deck truss structure for the transformation of a reinforced concrete structural beam; it is characterized in that it is arranged above the structural beam 3 that needs to be strengthened, with a floor slab 1 spaced between it and the structural beam 3, and includes at least two lower chord beams 9 arranged closely on the upper surface of the floor slab 1, and upper chord beams 8 arranged above the vertical projection direction of each lower chord beam 9;

[0041] Multiple lower horizontal tie rods 13 are arranged between every two adjacent lower chord beams 9;

[0042] Multiple upper horizontal tie rods 12 are arranged between every two adjacent upper chord beams 8;

[0043] Multiple vertical web members 10 are arranged between each lower chord beam 9 and the corresponding upper chord beam 8 located above it;

[0044] Multiple diagonal web members 11 are arranged between every two vertical web members 10;

[0045] Multiple lower hanging suspension rods 6 are arranged between each lower chord beam 9 and the structural beam 3;

[0046] Stamp holes 5 penetrating the floor slab 1 are arranged at the positions of the floor slab 1 corresponding to each lower hanging suspension rod 6;

[0047] Each lower hanging suspension rod 6 is fixed to the structural beam 3 through matching shear-resistant pin holes and shear-resistant pins 7;

[0048] The lengths of all the lower chord beams 9 and all the upper chord beams 8 cover a range of at least 1.2 meters outside the two structural columns 2 that still remain in the part of the structural beam 3 that needs to be strengthened after the transformation.

[0049] In the present invention, the main part of the deck truss structure composed of lower chord beams 9, upper chord beams 8, lower horizontal tie rods 13, upper horizontal tie rods 12, vertical web members 10 and diagonal web members 11 is added on the floor slab 1 above the part of the structural beam 3 that needs to be strengthened;

[0050] And the part of the structural beam 3 that needs to be strengthened is connected to each lower chord beam 9 by multiple lower hanging suspension rods 6 penetrating the floor slab 1. Therefore, no concrete pouring operation is required. On the premise of meeting the low reinforcement requirements, the net clear height of the structural beam 3 will not be reduced, and the construction is more convenient and more low-carbon and environmentally friendly.

[0051] In some embodiments, the spacing between every two adjacent lower hanging suspension rods 6 is not less than 400 millimeters;

[0052] The depth of each shear pin hole is 120 mm ± 5%, and the distance from the lower surface of the floor slab 1 is not less than 150 mm, and the distance from the lower surface of the structural beam 3 is not less than 300 mm.

[0053] In some embodiments, the gap between each postage hole 5 and the corresponding hanging hanger 6 is filled with polyurethane building sealant.

[0054] In Figures 1 to 3 wherein, S1 is the distance between the two outer sides of the structural columns 2 that still remain after the strengthening parts of the two ends of all the lower chord beams 9 and all the upper chord beams 8 exceeding the structural beam 3 are strengthened;

[0055] S2 is the distance from the top surface of each upper chord beam 8 to the upper surface of the floor slab 1;

[0056] S3 is the thickness of the floor slab 1;

[0057] S4 is the distance from the center of the shear pin hole to the lower surface of the floor slab 1;

[0058] S5 is the distance from the center of the shear pin hole to the lower surface of the structural beam 3;

[0059] S6 is the spacing between every two adjacent hanging hangers 6;

[0060] S7 is the width of the structural beam 3.

[0061] As Figures 1 to 3 shown, the present invention also provides a method for retrofitting a reinforced concrete structural beam by applying the above-mentioned up-bearing truss structure for retrofitting a reinforced concrete structural beam, including the following steps:

[0062] Step 1, weld all the lower chord beams 9, all the upper chord beams 8, all the lower horizontal tie rods 13, all the upper horizontal tie rods 12, all the vertical web members 10 and all the diagonal web members 11 together on the upper surface of the floor slab 1 above the strengthening part of the structural beam to be strengthened by welding to form the main body part of the up-bearing truss structure;

[0063] Step 2, open all the postage holes 5 for passing through the hanging hangers 6 on the floor slab 1 according to the design requirements;

[0064] Step 3, open all the shear pin holes in the strengthening part of the structural beam 3;

[0065] Step 4, arrange the corresponding hanging hangers 6 in each postage hole 5, and fix the upper end of each hanging hanger 6 to the corresponding lower chord beam 9;

[0066] Set the corresponding shear pins 7 at the lower end of each hanging hanger 6, and fix each hanging hanger 6 to the structural beam 3 by setting the corresponding shear pins 7 into the corresponding shear pin holes;

[0067] Step 5: According to the design requirements, cut off the intermediate pillar 4 located at the middle position of the part of the structural beam 3 that needs to be strengthened;

[0068] Step 6: Fill the gap between each postage hole 5 and the corresponding hanging rod 6 below with polyurethane building sealant.

[0069] In some embodiments, after completing Step 6, anti-corrosion measures are applied to all exposed steel structure members.

[0070] The present invention is applicable to the situation where the intermediate pillar of the structural beam needs to be removed, and the application scenarios can be commercial and office buildings, archives, underground garages, etc.

[0071] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. An upper chord truss structure for the transformation of a reinforced concrete structural beam; It is characterized in that, It is arranged above the structural beam (3) that needs to be strengthened, with a floor slab (1) spaced between it and the structural beam (3), including at least two lower chord beams (9) arranged closely on the upper surface of the floor slab (1), and upper chord beams (8) arranged above the vertical projection direction of each lower chord beam (9); Multiple lower horizontal tie rods (13) are provided between every two adjacent lower chord beams (9); Multiple upper horizontal tie rods (12) are provided between every two adjacent upper chord beams (8); Multiple vertical web members (10) are provided between each lower chord beam (9) and the corresponding upper chord beam (8) located above it; Diagonal web members (11) are provided between every two vertical web members (10); Multiple lower hanging suspension rods (6) are provided between each lower chord beam (9) and the structural beam (3); Stamp holes (5) penetrating the floor slab (1) are provided at the positions of the floor slab (1) corresponding to each lower hanging suspension rod (6); Each lower hanging suspension rod (6) is fixed to the structural beam (3) through matching shear-resistant pin holes and shear-resistant pins (7); The lengths of all the lower chord beams (9) and all the upper chord beams (8) cover a range of at least 1.2 meters outside the two structural columns (2) that still remain after the transformation of the part of the structural beam (3) that needs to be strengthened; The spacing between every two adjacent lower hanging suspension rods (6) is not less than 400 millimeters; The depth of each shear-resistant pin hole is 120 millimeters ± 5%, the distance from the lower surface of the floor slab (1) is not less than 150 millimeters, and the distance from the lower surface of the structural beam (3) is not less than 300 millimeters; The gap between each stamp hole (5) and the corresponding lower hanging suspension rod (6) is filled with polyurethane building sealant.

2. A method for transforming a reinforced concrete structural beam by applying the upper chord truss structure for the transformation of a reinforced concrete structural beam as claimed in claim 1, It is characterized in that, It includes the following steps: Step 1: Weld all the lower chord beams (9), all the upper chord beams (8), all the lower horizontal tie rods (13), all the upper horizontal tie rods (12), all the vertical web members (10) and all the diagonal web members (11) together on the upper surface of the floor slab (1) above the part of the structural beam that needs to be strengthened by welding to form the main part of the upper chord truss structure; Step 2: Open all the stamp holes (5) for passing through the lower hanging suspension rods (6) on the floor slab (1) according to the design requirements; Step 3: Open all the shear-resistant pin holes in the part of the structural beam (3) that needs to be strengthened; Step 4: Set the corresponding lower hanging suspension rods (6) in each stamp hole (5), and fix the upper end of each lower hanging suspension rod (6) to the corresponding lower chord beam (9); Set the corresponding shear-resistant pins (7) at the lower end of each lower hanging suspension rod (6), and fix each lower hanging suspension rod (6) to the structural beam (3) by setting the corresponding shear-resistant pins (7) into the corresponding shear-resistant pin holes. Step 5: Cut off the middle strut (4) located at the middle position of the part of the structural beam (3) that needs to be strengthened according to the design requirements; Step 6: Fill the gap between each of the postage stamp holes (5) and the corresponding hanging rod (6) with polyurethane building sealant.

3. The renovation method according to claim 2, characterized in that after completing Step 6, apply anti-corrosion measures to all exposed steel structural members.

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