Reinforced concrete frame column with increased section and construction method of reinforced concrete frame column

Abstract

According to the reinforced concrete frame column with the increased cross section, when the cross section of the concrete frame column is increased for reinforcement, a newly-added longitudinal bar is prevented from penetrating a beam, and the reinforcement requirement of the frame column is met. The concrete frame column comprises an original structure column vertically arranged and an original structure beam horizontally arranged at the upper end of the original structure column. A reinforcing unit is further included; each reinforcing unit comprises a connecting node and a newly-added longitudinal bar; the connecting joint comprises a hoop steel plate and a connecting steel plate. Hoop steel plates are arranged on the top face, the bottom face and the two side faces of the connecting end of the original structural beam and the original structural column. An upper connecting steel plate is vertically connected to the hoop steel plate located on the top face, and a lower connecting steel plate is vertically connected to the hoop steel plate located on the bottom face. Gaps are formed between the upper connecting steel plate and the lower connecting steel plate and the side surfaces of the corresponding sides of the original structural column; in the newly-added section, the upper end of the newly-added longitudinal bar located below the original structural beam is connected with the lower connecting steel plate; the lower end of the newly-added longitudinal bar located above the original structural beam is connected with the upper vertical connector.

Description

Technical Field

[0001] The invention relates to a concrete frame column, in particular to a reinforced concrete frame column with an enlarged cross-section, and belongs to the technical field of civil engineering. Background Art

[0002] At present, facing the problems of high-performance building functions and aging of existing buildings due to long-term use, if the economic and social impacts are taken into consideration, it is necessary to reasonably reinforce the existing buildings, so there are more and more reinforcement projects for existing concrete structures.

[0003] As a major load-bearing component, frame columns have a great demand for reinforcement, and the most commonly used reinforcement method is to increase the section. The method of increasing the section sets the reinforcement required for reinforcement in the newly added section, in which the lower end of the longitudinal force-bearing steel bar should extend into the foundation or the lower beam and column and meet the anchorage requirements; the longitudinal bars outside the original structural range at the upper end (i.e., outside the horizontal projection range of the beam) should pass through the floor slab and extend into the upper column foot or be capped and anchored at the roof panel, and the longitudinal bars within the original structural range (i.e., within the horizontal projection range of the beam) need to pass through the beam and extend into the upper column foot or be capped and anchored at the roof panel. However, in actual projects, the reinforcement at the end of the original structure beam is often very dense, and the diameter of the longitudinal bars for the reinforcement columns is relatively large. When passing through the beam, the steel bars in the beam will inevitably be broken, reducing or even destroying the structural bearing capacity, which deviates from the original intention of structural reinforcement.

[0004] Therefore, the existing method of increasing the cross-section to strengthen the concrete frame column has the following problems:

[0005] (1) When reinforcing frame columns by increasing the cross-section, when the newly added longitudinal reinforcement of the frame column passes through the original structural beam, it is often difficult to drill holes for embedding reinforcement, resulting in the inability to construct. In addition, the bottom reinforcement in the original beam may be broken, which may damage the bearing capacity of the structure and even cause safety hazards.

[0006] (2) When anchoring steel bars, structural adhesive must be injected into the perforated area. When drilling holes through beams, the length of the perforated holes is too long, making it difficult to ensure construction quality.

[0007] The above situation affects both the reinforcement effect and the practicality of the building. Summary of the invention

[0008] In view of this, the present invention provides a concrete frame column with an enlarged cross-section for reinforcement, which can avoid adding new longitudinal reinforcement through the beam when the concrete frame column is enlarged for reinforcement, thereby avoiding interrupting the original structural beam steel bars, and meeting the reinforcement requirements of the frame column, ensuring the realization of the purpose of strengthening the existing structure.

[0009] A reinforced concrete frame column with enlarged cross-section, comprising: an original structural column arranged vertically and original structural beams arranged horizontally on four sides of the original structural column; and a reinforcement unit;

[0010] The reinforcement unit includes: a force transmission node and newly added longitudinal reinforcement;

[0011] The force transmission node includes: a hoop steel plate and a connecting steel plate; hoop steel plates are arranged on the top surface, bottom surface and two side surfaces of the connecting end of the original structural beam and the original structural column; an upper connecting steel plate is vertically connected to the hoop steel plate located on the top surface, and a lower connecting steel plate is vertically connected to the hoop steel plate located on the bottom surface; there is a gap between the upper connecting steel plate and the lower connecting steel plate and the side surfaces of the corresponding sides of the original structural column;

[0012] In the newly added section, the upper end of the newly added longitudinal reinforcement located below the original structural beam is connected to the lower connecting steel plate; the lower end of the newly added longitudinal reinforcement located above the original structural beam is connected to the upper vertical connection.

[0013] As a preferred embodiment of the present invention, the length of the hoop steel plate is not less than 300 mm, and the lengths of the upper connecting steel plate and the lower connecting steel plate are not less than 200 mm.

[0014] As a preferred embodiment of the present invention, in the newly added cross section, newly added longitudinal reinforcements located outside the upper connecting steel plate and the lower connecting steel plate pass through the structural plate at corresponding positions.

[0015] As a preferred embodiment of the present invention, in the structural plate, the plate reinforcement at the corresponding position of the hoop steel plate is welded to the hoop steel plate.

[0016] In addition, the present invention provides a construction method for a concrete frame column with an enlarged cross-section and reinforcement, which is used for the construction of a reinforcement unit in the above-mentioned concrete frame column with an enlarged cross-section and reinforcement:

[0017] Step 1: Welding and assembling the hoop steel plate:

[0018] The surface of the original structural beam is polished and flattened; the hoop steel plate is temporarily fixed around the hoop steel plate of the original structural beam according to the set position, and then all the hoop steel plates are strongly connected by full penetration butt welding;

[0019] Step 2, fixing the hoop steel plate on the original structural beam;

[0020] Step 3, welding the upper connecting steel plate to the upper end surface of the hoop steel plate, and welding the lower connecting steel plate to the lower end surface of the hoop steel plate;

[0021] Step 4: Filling the gap with cement-based grouting material: Use high-strength cement-based grouting material to fill the gap between the hoop steel plate and the original structural beam and fill it tightly. After the filling is completed, seal and maintain;

[0022] Step 5, tying the newly added longitudinal reinforcement and stirrups: the newly added longitudinal reinforcement below the original structural beam is welded to the lower connecting steel plate by double-sided fillet welds; the newly added longitudinal reinforcement above the original structural beam is welded to the upper connecting steel plate by double-sided fillet welds; and then the newly added longitudinal reinforcement is bound by stirrups;

[0023] Step 6: Pour concrete within the newly added section to complete the construction.

[0024] As a preferred embodiment of the present invention, in step 2, high-strength rear-expanded bottom anchor bolts are used at the top and bottom of the original structural beam and are plug-welded with the corresponding end hoop steel plates, and embedded steel bars are used on the left and right sides of the original structural beam and are plug-welded with the hoop steel plates on both sides.

[0025] Beneficial effects:

[0026] (1) The present invention connects the newly added longitudinal reinforcement to the connecting steel plate in the force transmission node by setting a force transmission node. Therefore, when the cross-section of the concrete frame column is increased for reinforcement, it is avoided that the newly added longitudinal reinforcement passes through the beam, thereby avoiding breaking the original structural beam steel bars. The original structural beam can be protected when the longitudinal reinforcement is anchored, ensuring that the purpose of reinforcing the concrete column is achieved while avoiding secondary damage to the original structural beam.

[0027] (2) The reinforcement unit of the present invention can also avoid excessively long implanted reinforcements; in addition, it can also avoid deep implantation and glue injection where the actual construction effect cannot be verified.

[0028] (3) The reinforcement unit of the present invention is easier to implement in terms of construction technology, and the construction quality is easier to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0030] Figure 2 is a side view of the present invention;

[0031] Figure 3 for Figure 2 AA section view;

[0032] Figure 4 for Figure 2 BB cross-sectional view;

[0033] Figure 5 for Figure 2 CC section view;

[0034] Figure 6 for Figure 3 DD section view (schematic diagram of plate top reinforcement connection);

[0035] Figure 7 for Figure 3 EE section view (diagram of connection of bottom reinforcement of plate);

[0036] Among them: 1-original structural column; 2-original structural beam; 3-upper connecting steel plate; 4-lower connecting steel plate; 5-hoop steel plate; 6-newly added longitudinal reinforcement, 61-non-penetrating longitudinal reinforcement, 62-penetrating longitudinal reinforcement, 7-plate top reinforcement, 8-plate bottom reinforcement. DETAILED DESCRIPTION

[0037] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] Embodiment 1:

[0039] This embodiment provides a reinforced concrete frame column with an enlarged cross-section. By adding a new force transmission node, it avoids adding new longitudinal reinforcement through the beam and meets the reinforcement requirements of the frame column, ensuring the realization of the purpose of strengthening the existing structure.

[0040] like Figure 1-Figure 5 As shown, the concrete frame column includes: an original structural column 1, an original structural beam 2 and a reinforcement unit; the original structural column 1 is vertically arranged (the upper end is connected to the structural top plate, and the lower end is connected to the structural bottom plate), and the original structural beam 2 is horizontally arranged at the upper end of the original structural column 1 (the width of the original structural beam 2 is smaller than the width of the side surface connected to the original structural column 1); the reinforcement unit is arranged at the connection between the original structural column 1 and the original structural beam 2, and the reinforcement unit is used to increase the cross-section reinforcement.

[0041] The reinforcement unit includes a force transmission node and a newly added longitudinal reinforcement 6; wherein the force transmission node includes: a hoop steel plate 5 and a connecting steel plate; hoop steel plates 5 are arranged on the top surface, bottom surface and two side surfaces of the connecting end of the original structural beam 2 and the original structural column 1, that is, four hoop steel plates 5 are used to surround the connecting end of the original structural beam 2 and the original structural column 1; an upper connecting steel plate 3 extending upward is vertically connected (such as welded) to the hoop steel plate 5 located on the top surface, and a lower connecting steel plate 4 extending downward is vertically connected (such as welded) to the hoop steel plate 5 located on the bottom surface. There is a gap between the upper connecting steel plate 3 and the lower connecting steel plate 4 and the side surface of the corresponding side of the original structural column 1. In the newly added section, the upper end of the newly added longitudinal reinforcement 6 (i.e., the lower layer newly added longitudinal reinforcement) located below the original structural beam 2 is connected to the lower connecting steel plate 4 (e.g., welded), and the lower end is supported on the structural bottom plate; the lower end of the newly added longitudinal reinforcement 6 (i.e., the upper layer newly added longitudinal reinforcement) located above the original structural beam 2 is connected to the upper connecting steel plate 3 (e.g., welded), and the upper end is supported on the structural top plate. It can be seen that the gap between the upper vertical connection 3 and the lower connecting steel plate 4 and the side of the corresponding side of the original structural column 1 depends on the size of the newly added section (the distance between the newly added longitudinal reinforcement 6 and the original structural column 1 can be determined based on the size of the newly added section, and then the distance value between the upper vertical connection 3 and the lower connecting steel plate 4 and the original structural column 1 can be obtained). Finally, the newly added longitudinal reinforcement 6 is bounded by stirrups.

[0042] In the reinforcement unit of this structural form, the newly added longitudinal reinforcement 6 is only connected to the connecting steel plate (a general term for the upper connecting steel plate 3 and the lower connecting steel plate 4), and the force is transmitted to the hoop steel plate 5 through the connecting steel plate, which can avoid the newly added longitudinal reinforcement passing through the beam, thereby avoiding breaking the original steel bars inside the original structural beam 2 during reinforcement.

[0043] After completing the assembly of the force transmission nodes and the newly added longitudinal reinforcement 6, concrete can be poured directly within the designed newly added cross-sectional area.

[0044] As an example, the thickness of the connecting steel plate and the hoop steel plate 5 is not less than 20 mm.

[0045] As an example, the length of the hoop steel plate 5 (the dimension along the length direction of the original structural beam 2) is not less than 300 mm.

[0046] As an example, the width of the connecting steel plate is the same as the width of the hoop steel plate 5, and the length of the connecting steel plate (the dimension along the length direction of the original structural column 1) is not less than 200 mm.

[0047] Since a structural plate is arranged on the plane where the original structural beam 2 is located, and since the width of the connecting steel plate is the same as the width of the hoop steel plate 5, the newly added longitudinal reinforcement 6 outside the range of the connecting steel plate in the newly added section penetrates the structural plate at the corresponding position (the newly added longitudinal reinforcement 6 after penetration does not expose the structural plate); therefore, the newly added longitudinal reinforcement 6 is divided into a non-penetrating longitudinal reinforcement 61 connected to the connecting steel plate and a penetrating longitudinal reinforcement 62 penetrating the structural plate.

[0048] Since there are plate reinforcements running through the structural plate, such as Figure 6 As shown, when the structural plate is a roof plate, a plate top reinforcement 7 runs through the interior; Figure 7 As shown, when the structural plate is a floor plate, a plate bottom rib 8 runs through the interior. To install the hoop steel plate 5, the plate rib (plate top rib 7 or plate bottom rib 8) at the installation position of the hoop steel plate 5 needs to be disconnected, and then after the hoop steel plate 5 is installed, the disconnected plate rib is connected to the hoop steel plate 5 (such as by welding); the plate ribs at other positions in the structural plate remain unchanged.

[0049] Embodiment 2:

[0050] This embodiment provides a construction method for the reinforcement unit in the above-mentioned concrete frame column with increased cross-section reinforcement.

[0051] Before construction, first customize the upper connecting steel plate 3, the lower connecting steel plate 4 and four hoop steel plates 5 according to the dimensions of the original structural column 1 and the original structural beam 2 in the concrete frame column to be reinforced; the thickness of the upper connecting steel plate 3, the lower connecting steel plate 4 and the hoop steel plate 5 shall not be less than 20 mm, and the length and width dimensions shall be determined according to the actual situation on site.

[0052] The on-site construction method is as follows (here are only the construction steps of the reinforcement unit, excluding the construction steps of the structural plate at the installation position in the early stage to realize the installation of the reinforcement unit):

[0053] Step 1, welding and assembling the hoop steel plate 5: grind the surface of the original structural beam 2 flat and remove the floating dust; align the reserved holes on the hoop steel plate 5 with the steel bars or anchor bolts and temporarily fix them around the original structural beam 2, and then use the method of full penetration butt welding to strongly connect all the hoop steel plates 5, and the weld quality grade shall not be lower than Grade 1;

[0054] Step 2, the hoop steel plate 5 is fixed to the original structural beam 2: the top and bottom of the original structural beam 2 are fixed with high-strength rear bottom anchor bolts and plug-welded with the hoop steel plates 5 on the corresponding end faces, and the left and right sides of the original structural beam 2 are fixed with embedded steel bars and plug-welded with the hoop steel plates 5 on both sides, and the weld quality grade is not less than Grade 1;

[0055] Step 3, weld the upper connecting steel plate 3 to the upper end surface of the hoop steel plate 5, and weld the lower connecting steel plate 4 to the lower end surface of the hoop steel plate 5; and maintain a set gap with the original structural column 1 (the set gap is determined by the position of the newly added longitudinal reinforcement 6);

[0056] Step 4, grouting with cement-based grouting material: Use high-strength cement-based grouting material to fill the small gap between the hoop steel plate 5 and the original structural beam 2 tightly, and seal and maintain after grouting.

[0057] Step 5, tie the newly added longitudinal reinforcement 5 and stirrups: the non-penetrating longitudinal reinforcement 61 below the original structural beam 2 is connected to the lower connecting steel plate 4 by double-sided fillet welds, and the weld quality grade is not less than Class 1; the non-penetrating longitudinal reinforcement 61 above the original structural beam 2 is connected to the upper connecting steel plate 3 by double-sided fillet welds, and the weld quality grade is not less than Class 1; the remaining newly added longitudinal reinforcements (i.e., the penetrating longitudinal reinforcement 62) are constructed according to relevant specifications. Then the newly added longitudinal reinforcement 6 is bounded by stirrups.

[0058] Step 6: Pour concrete: Set up formwork around the original structural column 1 and the original structural beam 2, pour concrete within the designed new section range, and complete the construction.

[0059] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reinforced concrete frame column with enlarged cross-section, comprising: The original structural column (1) is arranged vertically and the original structural beam (2) is arranged horizontally on four sides of the original structural column; the characteristic is that it also includes a reinforcement unit; The reinforcement unit comprises: a force transmission node and newly added longitudinal reinforcement (6); The force transmission node comprises: a hoop steel plate (5) and a connecting steel plate; the hoop steel plate (5) is arranged on the top surface, the bottom surface and two side surfaces of the connecting end of the original structural beam (2) and the original structural column (1); the upper connecting steel plate (3) is vertically connected to the hoop steel plate (5) located on the top surface, and the lower connecting steel plate (4) is vertically connected to the hoop steel plate (5) located on the bottom surface; there is a gap between the upper connecting steel plate (3) and the lower connecting steel plate (4) and the side surfaces corresponding to the original structural column (1); In the newly added section, the upper end of the newly added longitudinal reinforcement (6) located below the original structural beam (2) is connected to the lower connecting steel plate (4); the lower end of the newly added longitudinal reinforcement (6) located above the original structural beam (2) is connected to the upper vertical connection (3).

2. The reinforced concrete frame column with enlarged cross-section as claimed in claim 1, characterized in that: The length of the hoop steel plate (5) is not less than 300 mm, and the lengths of the upper connecting steel plate (3) and the lower connecting steel plate (4) are not less than 200 mm.

3. The reinforced concrete frame column with enlarged cross-section as claimed in claim 1 or 2, characterized in that: In the newly added cross section, the newly added longitudinal reinforcement (6) located outside the upper connecting steel plate (3) and the lower connecting steel plate (4) penetrates the structural plate at the corresponding position.

4. The reinforced concrete frame column with enlarged cross-section as claimed in claim 1 or 2, characterized in that: In the structural plate, the plate reinforcement at the corresponding position of the hoop steel plate (5) is welded to the hoop steel plate (5).

5. A method for constructing a concrete frame column with an enlarged cross section and reinforced concrete frame column, characterized in that: Used for the construction of reinforcement units in concrete frame columns with increased cross-section reinforcement as described in any one of claims 1 to 4: Step 1: Welding and assembling the hoop steel plate (5): The surface of the original structural beam (2) is polished and made flat; the hoop steel plate (5) is temporarily fixed to the surrounding of the hoop steel plate (5) of the original structural beam according to the set position, and then all the hoop steel plates (5) are strongly connected by full penetration butt welding; Step 2, fixing the hoop steel plate (5) on the original structural beam (2); Step 3, welding the upper connecting steel plate (3) to the upper end surface of the hoop steel plate (5), and welding the lower connecting steel plate (4) to the lower end surface of the hoop steel plate (5); Step 4, grouting with cement-based grouting material: Use high-strength cement-based grouting material to fill the gap between the hoop steel plate (5) and the original structural beam (2) tightly, and seal and maintain after the grouting is completed; Step 5, tying the newly added longitudinal reinforcement (5) and stirrups: the newly added longitudinal reinforcement (6) below the original structural beam (2) is welded to the lower connecting steel plate (4) by double-sided fillet welds; the newly added longitudinal reinforcement (6) above the original structural beam (2) is welded to the upper connecting steel plate (3) by double-sided fillet welds; and then the newly added longitudinal reinforcement (6) is bound by stirrups; Step 6: Pour concrete within the newly added section to complete the construction.

6. The method for constructing a concrete frame column with increased cross-section reinforcement as claimed in claim 5, characterized in that: In step 2, high-strength rear-expanded bottom anchor bolts are used at the top and bottom of the original structural beam (2) and are plug-welded with the corresponding end hoop steel plates (5), and embedded steel bars are used on the left and right sides of the original structural beam (2) and are plug-welded with the hoop steel plates (5) on both sides.

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