The nodes of the middle support of the floor frame beam are strengthened by embedding prestressed carbon fiber tendons in the slab surface

Abstract

The utility model relates to a node in which a prestressed carbon fiber reinforcement is embedded in a panel surface to reinforce the middle support of a floor frame beam, including: a frame column, a reinforced frame beam, other frame beams at the node, and a floor slab; the frame column, the reinforced frame beam, other frame beams at the node, and the floor slab are intersected and connected; the node also includes carbon fiber reinforcement, a prestressed reinforcement groove chiseled on the top surface of the floor slab, and a guide channel obliquely penetrating the floor slab; the prestressed carbon fiber reinforcement passes through the frame column; the prestressed carbon fiber reinforcement is placed in the prestressed reinforcement groove and then embedded in the floor slab; the end of the prestressed carbon fiber reinforcement passes through the guide channel and is fixed to the two sides of the reinforced frame beam or the bottom surface of the floor slab by a tensioning anchor. Compared with the prior art, the utility model can be applied to the reinforcement of the middle support section of the reinforced concrete frame beam where the bending bearing capacity is insufficient, ensures continuous force, eliminates the strain hysteresis phenomenon, and can give full play to the high strength performance of the carbon fiber material; in actual engineering applications, it causes less damage to the original structure and is convenient for construction.

Description

Technical Field

[0001] The utility model relates to the technical field of building structure reconstruction and reinforcement design, in particular to a node of a middle support of a floor frame beam reinforced with prestressed carbon fiber tendons embedded in a plate surface. Background Art

[0002] At present, when the bending bearing capacity of the middle support of the reinforced concrete frame beam of the floor is insufficient, the actual project usually adopts the measure of sticking carbon fiber cloth or steel plate and other reinforcement materials on the top of the beam for reinforcement. The reinforcement material and the concrete substrate are bonded by structural adhesive to achieve collaborative work. When the above method is used for reinforcement, the reinforcement material is blocked by the upper structure column located at the middle support of the reinforced concrete floor frame beam and cannot be continuously penetrated. It can only be fixed near the root of the upper structure column by means of pressure strips after the two sides of the middle support of the frame beam are disconnected. This reinforcement node method is contrary to the force characteristics of continuous bending moment at the middle support of the reinforced concrete frame beam of the floor.

[0003] In actual projects, when reinforcement is carried out by surface-pasting reinforcement materials, since the original structural frame beams being reinforced have already borne part of the load such as the self-weight of the structure, there is a strain lag between the reinforcement materials and the original structural frame beams being reinforced, and the high-strength performance of the reinforcement materials cannot be fully exerted. The collaborative working efficiency of the reinforcement materials pasted on the top of the beam and the reinforced frame beams is greatly affected by the performance of the structural adhesive, which often results in low reinforcement efficiency or material waste, resulting in insufficient structural safety reserves after reinforcement and increased reinforcement costs.

[0004] Therefore, there is an urgent need for a node in which the prestressed carbon fiber reinforcement is embedded in the panel to reinforce the middle support of the floor frame beam to ensure continuous force and eliminate strain lag.

[0005] Patent CN202322611096.2 provides a node for reinforcing the middle support of the floor frame beam with prestressed carbon fiber tendons planted under the plate, the node includes a frame column, a reinforced frame beam, an orthogonal frame beam, and a floor slab; the frame column, the reinforced frame beam, the orthogonal frame beam, and the floor slab are intersected and connected; the node also includes prestressed carbon fiber tendons and tension anchors; the prestressed carbon fiber tendons pass through the frame column; and the two ends of the prestressed carbon fiber tendons are connected with tension anchors. Compared with the prior art, the node of the intermediate support of the floor frame beam with prestressed carbon fiber tendons planted under the plate of the utility model can be used to reinforce the support section of the reinforced concrete frame beam where the bending bearing capacity is insufficient, and can ensure the force continuity, avoid the situation where the reinforcement efficiency is reduced due to failure of the connection surface, and can eliminate the strain hysteresis phenomenon, and can effectively exert the high strength performance of carbon fiber materials. In actual engineering applications, the damage to the original structure is small, the construction is convenient, and there is almost no impact on the use function of the building. However, the elastic modulus of carbon fiber materials is smaller than that of steel bars. When located under the slab, due to the close distance to the resultant force point in the concrete compression zone, the deformation is small, the performance is limited, and the high-strength properties of carbon fiber materials cannot be fully utilized. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and to provide a node of the middle support of the floor frame beam embedded with prestressed carbon fiber tendons. The utility model can be used to reinforce the middle support section of the reinforced concrete frame beam where the bending bearing capacity is insufficient, and can ensure the continuity of force. At the same time, it can eliminate the strain lag phenomenon and give full play to the high-strength performance of carbon fiber materials. In actual engineering applications, it causes less damage to the original structure and is convenient for construction.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] The utility model provides a node for reinforcing the middle support of a floor frame beam with a prestressed carbon fiber reinforcement embedded in the panel surface, comprising: a frame column, a reinforced frame beam, other frame beams at the node, and a floor slab;

[0009] The frame columns, reinforced frame beams, other frame beams at the nodes, and floor slabs intersect and connect;

[0010] The nodes also include carbon fiber reinforcement, prestressed reinforcement grooves cut out on the top surface of the floor slab, and guide channels that run obliquely through the floor slab;

[0011] The prestressed carbon fiber tendons penetrate the frame columns; the prestressed carbon fiber tendons are placed in the prestressed tendon grooves and then embedded in the floor slabs; the ends of the prestressed carbon fiber tendons pass through the guide channels and are fixed to the two sides of the reinforced frame beams or the bottom of the floor slabs through tensioning anchors.

[0012] Furthermore, the node also includes reinforcement holes and prestressed reinforcement grooves;

[0013] The reinforcement holes penetrate the frame columns; the prestressed reinforcement grooves are arranged on the floor surface and on both sides of the reinforced frame beams;

[0014] The prestressed carbon fiber tendons are arranged in the prestressed tendon grooves, and then the prestressed carbon fiber tendons are embedded in the floor slab; the part of the prestressed carbon fiber tendons that passes through the frame column is located in the tendon penetration channel.

[0015] Furthermore, reinforcement holes are arranged on both sides of the reinforced frame beam and are aligned with the positions of the prestressed reinforcement grooves while penetrating the frame columns.

[0016] Furthermore, the gaps between the prestressed carbon fiber tendons and the tendon penetration channels, the prestressed tendon grooves, and the guide channels are filled with plugging materials to achieve sealing.

[0017] Furthermore, both ends of the prestressed carbon fiber tendons are fixed to the bottom surface of the floor slab or the side surface of the reinforced frame beam through tensioning anchors.

[0018] Furthermore, a plurality of prestressed carbon fiber tendons are arranged in the same tendon groove.

[0019] Furthermore, the reinforced frame beams and other frame beams at the nodes meet at the frame columns.

[0020] Furthermore, the floor slab intersects and connects with the reinforced frame beams and other frame beams at the nodes, and the top elevations of the floor slab, the reinforced frame beams and other frame beams at the nodes are the same.

[0021] Furthermore, the reinforced frame beams, other frame beams at the nodes, and the floor slabs together constitute the floor system.

[0022] Furthermore, the frame columns, reinforced frame beams, other frame beams at the nodes, and floor slabs are all reinforced concrete structures.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] (1) The utility model uses the high-strength performance of carbon fiber materials and combines prestressing technology to reinforce the node of the middle support of the floor frame beam with the prestressed carbon fiber tendons on the panel surface. It is specifically a node of the middle support of the floor frame beam with the prestressed carbon fiber tendons on the panel surface. It can be used to reinforce the middle support section of the reinforced concrete frame beam where the bending bearing capacity is insufficient. It can ensure the force continuity and avoid the situation where the reinforcement efficiency is reduced due to the failure of the connection surface. At the same time, it can eliminate the strain lag phenomenon and give full play to the high-strength performance of carbon fiber materials. In actual engineering applications, the damage to the original structure is small, the construction is convenient, and there is almost no impact on the use function of the building.

[0025] (2) The utility model embeds prestressed carbon fiber tendons in the panel surface to reinforce the nodes of the middle supports of the floor frame beams. Considering that the reinforced reinforced concrete frame beams of the original structure have already borne part of the load, the strain lag between the prestressed carbon fiber tendons and the reinforced reinforced concrete frame beams can be effectively eliminated by applying prestress.

[0026] (3) The panel of the utility model is embedded with prestressed carbon fiber tendons to reinforce the nodes of the middle support of the floor frame beam. The prestressed carbon fiber tendons are located on the upper surface of the floor frame beam, so that the force arm of the resultant force point of the prestressed carbon fiber tendons is maximized, thereby being able to give full play to the high strength performance of the carbon fiber material.

[0027] (4) The utility model embeds prestressed carbon fiber tendons in the panel surface to reinforce the nodes of the middle support of the floor frame beam. Considering the light weight of the prestressed carbon fiber tendons and anchor materials, the overall weight of the structure is almost not increased. During the implementation of this technical solution, only a small amount of drilling and local chiseling are performed on the original structural frame columns and floor slabs, which causes less damage to the original structure. The prestressed carbon fiber tendons are embedded in the floor slabs through the prestressed tendon grooves, which does not affect the use function of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic elevation diagram of the node of the middle support of the floor frame beam reinforced with prestressed carbon fiber tendons embedded in the slab;

[0029] Figure 2 for Figure 1 AA section view;

[0030] Figure 3 for Figure 1 Middle BB section view;

[0031] Figure numerals: 10-prestressed carbon fiber tendons; 11-tensioning anchor; 12-reinforcement channel; 13-prestressed tendon groove; 14-guide channel; 21-reinforced frame beam; 22-other frame beams at the node; 23-frame column; 24-floor slab; 31-carbon fiber woven mesh cloth and carbon fiber strips. DETAILED DESCRIPTION

[0032] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, algorithms and other features not clearly described in this technical solution are all considered to be common technical features disclosed in the prior art.

[0033] Example 1

[0034] The utility model provides a node in which a prestressed carbon fiber reinforcement is embedded in a panel surface to reinforce the intermediate support of a floor frame beam, such as Figure 1 , 2, 3, including: frame columns 23, reinforced frame beams 21, other frame beams 22 at nodes, and floor slabs 24;

[0035] The frame column 23, the reinforced frame beam 21, other frame beams 22 at the node, and the floor slab 24 are intersected and connected;

[0036] The node also includes carbon fiber tendons 10, prestressed tendon grooves 13 chiseled out on the top surface of the floor slab 24, and guide channels 14 obliquely penetrating the floor slab 24;

[0037] The prestressed carbon fiber tendons 10 penetrate the frame column 23; the prestressed carbon fiber tendons 10 are placed in the prestressed tendon grooves 13, and then embedded in the floor slab 24; both ends of the prestressed carbon fiber tendons 10 are passed through the guide pads and the guide channels 14 and then fixed to the lower part of the floor slab by the tensioning anchors 11;

[0038] In a specific embodiment, the node further includes a reinforcement hole 12 and a prestressed reinforcement groove 13;

[0039] The reinforcement hole 12 passes through the frame column 23; the prestressed reinforcement groove 13 is arranged on the floor slab 24 and on both sides of the reinforced frame beam 21;

[0040] The prestressed carbon fiber tendons 10 are arranged in the prestressed tendon grooves 13 , and then the prestressed carbon fiber tendons 10 are embedded in the floor slab 24 ; the portion of the prestressed carbon fiber tendons 10 that passes through the frame column 23 is located in the tendon penetration channel 12 .

[0041] In a specific implementation, the reinforcement holes 12 are provided on both sides of the reinforced frame beam 21 , and are aligned with the positions of the prestressed reinforcement grooves 13 , while penetrating the frame columns 23 .

[0042] In a specific embodiment, the gaps between the prestressed carbon fiber tendons 10 and the tendon passages 12, the prestressed tendon grooves 13, and the guide passages 14 are filled with plugging materials to achieve sealing.

[0043] In a specific embodiment, both ends of the prestressed carbon fiber tendons 10 are fixed to the bottom surface of the floor slab 24 or the side surface of the reinforced frame beam 21 through tensioning anchors 11 .

[0044] In a specific embodiment, a plurality of prestressed carbon fiber tendons 10 are arranged in the same tendon groove 13 .

[0045] In a specific implementation, the reinforced frame beam 21 and other frame beams 22 at the nodes converge at the frame column 23 .

[0046] In a specific implementation, the floor slab 24 intersects and connects with the reinforced frame beams 21 and other frame beams 22 at the nodes, and the top elevations of the floor slab 24, the reinforced frame beams 21 and other frame beams 22 at the nodes are the same.

[0047] In a specific implementation, the reinforced frame beams 21, other frame beams 22 at the nodes, and the floor slabs 24 together constitute a floor system.

[0048] In a specific implementation, the frame column 23, the reinforced frame beam 21, other frame beams 22 at the node, and the floor slab 24 are all reinforced concrete structures. That is, the frame column 23 is a reinforced concrete frame column, the reinforced frame beam 21 is a reinforced reinforced concrete frame beam, other frame beams 22 at the node are orthogonal reinforced concrete frame beams, and the floor slab 24 is a reinforced concrete floor slab.

[0049] During specific implementation, the distance between the prestressed carbon fiber tendons 10 and the reinforced frame beam 21, the size of the prestressed tendon groove 13, and the size of the tendon threading channel 12 need to be determined by comprehensively considering the following factors: the construction operation space of the tendon threading channel 12 that passes through the center column, the size of the tensioning anchors 11 at both ends for fixing the prestressed carbon fiber tendons, and the actual reinforcement conditions at the intersection of the frame column 23 and the reinforced frame beam 21 and other frame beams 22 at the node.

[0050] In specific implementation, the diameter, number and length of the prestressed carbon fiber tendons 10, the size of the tensioning anchors 11 at both ends used to fix the prestressed carbon fiber tendons 10, and the size of the applied prestress need to be calculated and determined according to the needs of the actual project.

[0051] During specific implementation, the positioning of the guide channel 14 and the size of the guide pad need to be calculated and determined according to the needs of the actual project.

[0052] In addition, multiple prestressed carbon fiber tendons 10 can also be placed in the same prestressed tendon groove 13, and the tensioning anchors 11 at both ends of the prestressed carbon fiber tendons can be fixed to the bottom surface of the floor slab 24 or the side of the reinforced frame beam 21 according to the actual project requirements.

[0053] The tension anchor 11 may be a conventional arrangement, such as a tension anchor including an anchor plate, an anchor ring, a plurality of clips, and a spiral tendon, and the details will not be described in detail.

[0054] This specific implementation has the following key features:

[0055] 1. Use prestressed carbon fiber tendons 10 to reinforce the middle support nodes of the reinforced frame beam 21;

[0056] 2. The floor slab 24 needs to be positioned and chiseled out to form the prestressed tendon groove 13;

[0057] 3. Holes need to be drilled through the frame column 23, and the reinforcement holes 12 are located on both sides of the reinforced frame beam 21 and on the upper surface of the floor slab 24;

[0058] 4. The prestressed carbon fiber tendons 10 need to be properly tensioned and fixed to the bottom surface of the floor slab 24 or the side of the reinforced frame beam 21 through the tensioning anchors 11 at both ends;

[0059] 5. After the prestressed carbon fiber tendons 10 are tensioned and anchored, the gaps between the prestressed carbon fiber tendons 10 and the tendon holes 12, the prestressed tendon grooves 13, and the guide holes 14 that penetrate the center column should be filled and sealed with materials such as mortar or structural adhesives, and the upper surface of the prestressed tendon grooves 13 should be pasted with carbon fiber woven mesh cloth and carbon fiber strips 31 to protect the prestressed carbon fiber tendons 10 in the prestressed tendon grooves 13.

[0060] This technical solution achieves the purpose of reinforcing the middle support node of the frame beam by chiseling prestressed tendon grooves 13 on the plate surface on both sides of the reinforced frame beam 21, and drilling holes through the frame column 23 to arrange the prestressed carbon fiber tendons 10, and then by appropriately tensioning the prestressed carbon fiber tendons 10 and fixing them to the bottom surface of the floor slab 24 or the side of the reinforced frame beam 21. On the one hand, it eliminates the strain hysteresis phenomenon between the prestressed carbon fiber tendons 10 and the reinforced frame beam 21, giving full play to the high-strength performance of the carbon fiber tendons, and is consistent with the force characteristics of continuous bending moment at the middle support of the floor frame beam. On the other hand, it also saves building space and does not affect the use function of the building. In engineering applications, a small amount of drilling and local chiseling are performed on the original structural frame columns and floor slabs, resulting in less damage, and the construction is more convenient and efficient.

[0061] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0062] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A node for reinforcing the intermediate support of a floor frame beam with a prestressed carbon fiber reinforcement embedded in the panel, characterized in that: include: Frame columns (23), reinforced frame beams (21), other frame beams at nodes (22), and floor slabs (24); The frame columns (23), the reinforced frame beams (21), other frame beams (22) at the nodes, and the floor slabs (24) are intersected and connected; The node further comprises carbon fiber ribs (10), prestressed rib grooves (13) cut out of the top surface of the floor slab (24), and guide channels (14) obliquely penetrating the floor slab (24); The prestressed carbon fiber tendons (10) penetrate the frame columns (23); the prestressed carbon fiber tendons (10) are placed in prestressed tendon grooves (13) and then embedded in the floor slab (24); the ends of the prestressed carbon fiber tendons (10) pass through the guide holes (14) and are fixed to both sides of the reinforced frame beams (21) or the bottom surface of the floor slab (24) through tensioning anchors (11).

2. A node for reinforcing the intermediate support of a floor frame beam by embedding prestressed carbon fiber tendons in a panel surface according to claim 1, characterized in that: The node also includes a reinforcement hole (12) and a prestressed reinforcement groove (13); The reinforcement passage (12) passes through the frame column (23); the prestressed reinforcement groove (13) is arranged on the surface of the floor slab (24) and on both sides of the reinforced frame beam (21); The prestressed carbon fiber tendons (10) are arranged in the prestressed tendon grooves (13), and the prestressed carbon fiber tendons (10) are further embedded in the floor slab (24); the portion of the prestressed carbon fiber tendons (10) that passes through the frame column (23) is located in the tendon penetration channel (12).

3. A node for reinforcing the intermediate support of the floor frame beam by embedding prestressed carbon fiber tendons in the panel surface according to claim 2, characterized in that: The reinforcement penetration holes (12) are arranged on both sides of the reinforced frame beam (21), are aligned with the positions of the prestressed reinforcement grooves (13), and penetrate the frame column (23).

4. A node for reinforcing the intermediate support of a floor frame beam by embedding prestressed carbon fiber tendons in a panel surface according to claim 2, characterized in that: The gaps between the prestressed carbon fiber tendons (10) and the tendon penetration holes (12), the prestressed tendon grooves (13), and the guide holes (14) are filled with plugging materials to achieve sealing.

5. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber tendons embedded in the panel surface according to claim 1, characterized in that: Both ends of the prestressed carbon fiber tendons (10) are fixed to the bottom surface of the floor slab (24) or the side surface of the reinforced frame beam (21) via tension anchors (11).

6. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber tendons embedded in the panel surface according to claim 1, characterized in that: The plurality of prestressed carbon fiber tendons (10) are arranged in the same prestressed tendon groove (13).

7. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber reinforcement embedded in the panel surface according to claim 1, characterized in that: The reinforced frame beam (21) and other frame beams (22) at the nodes converge at the frame column (23).

8. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber tendons embedded in the panel surface according to claim 1, characterized in that: The floor slab (24) is intersected and connected with the reinforced frame beam (21) and other frame beams (22) at the nodes, and the top elevations of the floor slab (24), the reinforced frame beam (21) and other frame beams (22) at the nodes are the same.

9. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber tendons embedded in the panel surface according to claim 1, characterized in that: The reinforced frame beams (21), other frame beams (22) at the nodes, and the floor slab (24) together constitute a floor system.

10. The node of the intermediate support of the floor frame beam reinforced with prestressed carbon fiber reinforcement embedded in the panel surface according to claim 1, characterized in that: The frame columns (23), the reinforced frame beams (21), other frame beams (22) at the nodes, and the floor slab (24) are all reinforced concrete structures.

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