CN110630032A - A node connection device for adding new beams to existing reinforced concrete column beams - Google Patents

Abstract

The invention discloses a node connecting device for adding a beam on an existing reinforced concrete column beam, and belongs to the technical field of building reinforcement. The device comprises a hoop surrounding the periphery of an existing reinforced concrete column or a concrete beam, a horizontal connecting device and a vertical connecting device fixedly connected with the hoop, an anchoring rib and a newly-added beam supporting structure fixedly connected with the horizontal connecting device and the vertical connecting device. The hoop is provided with a plurality of through holes, and the anchoring ribs penetrate through the through holes to be fixed with the existing reinforced concrete columns or concrete beams. The outer surface of the hoop is not higher than the outer surface of the existing reinforced concrete column or concrete beam, and the hoop is fixed along the outer peripheral surface of the existing reinforced concrete column or concrete beam to form a whole. The device has reduced the node connection construction degree of difficulty of newly-increased reinforced concrete beam and existing frame post through taking simple steel corbel connection structure, has reduced the cross-section weakening to existing frame post, has improved bending resistance, the bearing capacity that shears in node region, has guaranteed that newly-increased reinforced concrete beam and existing frame post can the collaborative work well.

Description

A node connection device for adding new beams to existing reinforced concrete column beams

technical field

The invention relates to a node connection device for adding beams to existing reinforced concrete columns and beams, and belongs to the technical field of building reinforcement.

Background technique

With the growth of the building's service time, it will be damaged by man-made or natural, which will lead to the weakening of the structural strength of the building itself, and even cause the building to collapse in severe cases. In addition, when all or part of the building's functions change, it is likely that some load-bearing structures will need to be added. For example, in order to increase the business or use area, the original multi-storey atrium structure was cancelled, and multiple closed floors were constructed. Therefore, during the use of the building, not only the structure of the building itself needs to be reinforced, but also a new supporting load-bearing structure often needs to be added between the existing reinforced concrete columns or reinforced concrete beams.

At present, in the renovation project of the existing building structure, the reinforcement method of adding frame beams (or cantilever beams) on the original reinforced concrete frame columns, the conventional method is to add frame beams (or cantilever beams) to the corresponding parts of the original frame columns The longitudinally stressed steel bars are directly implanted into the column by chemical planting method. When using traditional methods to root new beams, three problems are often encountered during the construction process: First, when there are many longitudinal reinforcements for newly added beams, within the scope of planting bars, the minimum spacing of planting bars (S _min ≥ 5d) cannot be satisfied, which affects the anchoring effect of planted bars; secondly, when there are many longitudinal reinforcements for newly added beams, the drilling holes are too concentrated in the range of planted bars, which greatly weakens the section of the original frame column and affects the original frame column. Structural safety; thirdly, when the diameter of the longitudinal reinforcement of the newly-added beam is large, the cross-sectional size of the original frame column cannot meet the minimum anchorage depth required by theoretical calculation. Big difficulty.

Contents of the invention

In order to solve the problems faced in the process of adding beams to existing reinforced concrete columns or concrete beams in the prior art, the spacing of reinforcements cannot meet the requirements of technical specifications, the drilling of reinforcements is concentrated, and the cross-section of existing concrete columns or beams is weakened too much. To solve the technical problem of reducing the safety degree of the existing structure and the depth of the longitudinal reinforcement of the newly added beam cannot meet the requirements, the present invention provides a node connection device for adding a new beam on the existing reinforced concrete column beam, and the adopted technical scheme is as follows:

A node connection device for adding beams to existing reinforced concrete columns and beams, the device includes a ferrule 1 nested and enclosed on the outer periphery of the joint of the existing reinforced concrete column or concrete beam, and a horizontal connection device fixedly connected to the ferrule 1 2 and the vertical connecting device 3, the anchoring rib 5, and the newly added beam support structure fixedly connected with the horizontal connecting device 2 and the vertical connecting device 3; the hoop 1 is provided with a plurality of through holes, and the anchoring rib 5. Through the through hole, it is fixed to the existing reinforced concrete column or concrete beam; the hoop 1 is fixed along the outer peripheral surface of the existing reinforced concrete column or concrete beam to form a whole.

Preferably, the horizontal connection device 2 includes a plurality of top plates 21 and bottom plates 22 arranged horizontally; the plurality of top plates 21 are on the same horizontal plane and their edges are welded and fixed to form a ring structure.

More preferably, the vertical connecting device 3 is located between the top plate 21 and the bottom plate 22, and the vertical connecting device 3 includes a main vertical plate 31 welded to the lower surface of the top plate 21 and the upper surface of the bottom plate 22, and is located at the Both sides of the main vertical plate 31 are connected with side vertical plates 32 fixedly connected to at least the lower surface of the top plate 21 .

More preferably, the newly added beam support structure is a longitudinal reinforcement device 4 fixedly connected to the upper surface of the top plate 21 , the lower surface of the bottom plate 22 and the sides of the main vertical plate 31 and the side vertical plate 32 .

Preferably, the vertical connection device 3 includes a cantilever 6 between the top plate 21 and the bottom plate 22; the cantilever 61 includes an I-shaped steel beam and a main vertical plate 31; the main vertical plate 31 and the hoop The outer surface of the cover 1 is welded and fixed; the upper surface of the I-shaped steel beam is welded and fixed with the lower surface of the top plate 21 , and the lower surface is welded and fixed with the upper surface of the bottom plate 22 .

More preferably, the vertical surface of the I-shaped steel beam and the main vertical plate 31 are correspondingly provided with a plurality of through holes, and the I-shaped steel beam and the main vertical plate 31 are connected by the fixing device 61 passing through the through holes. The connection is fixed.

More preferably, the anchor bar 5 is implanted and anchored on the existing reinforced concrete column or beam through the evenly arranged through holes on the ferrule 1; or through the through holes arranged on the ferrule 1 and the existing reinforced concrete The steel bars in the columns or concrete beams are welded and fixed.

Preferably, the outer surface of the hoop 1 is not higher than the outer surface of the existing reinforced concrete column.

Preferably, a high-strength non-shrinkage concrete grout layer for bonding is provided between the hoop 1 and the existing reinforced concrete column or concrete beam.

More preferably, the ferrule 1 is a metal ferrule; further, the ferrule 1 is a steel ferrule with a thickness not less than 10 mm.

Another object of the present invention is to provide a method for constructing newly added reinforced concrete beams using any of the above node connection devices, the steps of the method are as follows:

1) The existing reinforced concrete columns need to add reinforced concrete beams or the four-sided concrete protective layer at the cantilever beams to expose the existing column longitudinal bars and stirrups;

2) Calculate the number and diameter of the anchor bars to be implanted at the newly added reinforced concrete beams, and implant the anchor bars by chemical planting method according to the calculation results;

3) Install the steel hoop with the through hole corresponding to the position of the anchor bar described in step (2) on the newly added reinforced concrete beam, and weld and fix the adjacent hoop plates into one, and then each Anchor bars and steel hoops are welded and fixed;

4) Weld the horizontal connection device and the vertical connection device on the outside of the steel hoop;

5) welding the longitudinal reinforcement of the newly added reinforced concrete column on the horizontal connection device and the vertical connection device described in step (4), and fixing the longitudinal reinforcement with stirrups;

6) Fill the gap between the steel ferrule and the existing column with high-strength non-shrinkage concrete grouting material;

7) Pouring concrete for the newly added beams.

Preferably, the thickness of the steel ferrule is not less than 10mm.

Compared with prior art, the beneficial effect that the present invention obtains:

The node connection device provided by the present invention reduces the construction difficulty of the node connection between the newly added reinforced concrete beam and the existing frame column by adopting a simple steel corbel connection structure, reduces the weakening of the section of the existing frame column, The flexural and shear bearing capacity of the joint area is improved, and the newly added reinforced concrete beam and the existing frame column can work well together.

The node connection device provided by the present invention creatively cooperates and fixes the through holes evenly distributed on the hoop plate with multiple anchoring tendons implanted in the concrete column for fixing. At the same time, by removing the existing reinforced concrete column or The outer concrete protective layer of the concrete beam enables the newly added hoop to be embedded in the existing concrete column, which greatly increases the connection strength and stability between the hoop and the existing concrete column beam, and effectively increases the shear resistance of the newly added beam. strength and load-bearing capacity.

The node connection device provided by the present invention connects the reinforcement of the newly added beam to the extension connection device through the extension connection device of the steel corbel type, thereby avoiding the existing concrete column or the inner reinforcement of the concrete beam from affecting the position of the newly added reinforcement, There are many restrictions on quantity and diameter, and the location of steel bars can be set arbitrarily according to specific needs and under the condition of meeting the requirements of technical specifications.

At the same time, the node connection device forms a ring-shaped overall force-bearing structure connected with the new beam in the circumferential direction of the hoop, which can effectively reduce the pulling effect of the new beam on the new surface, so that the gravity and shear force of the new beam be effectively dispersed.

Description of drawings

Fig. 1 is a schematic perspective view of a node connection device in a preferred embodiment of the present invention.

FIG. 2 is a schematic top view of the structure of FIG. 1 .

FIG. 3 is a schematic cross-sectional structural diagram along the A-A direction of FIG. 2 .

Fig. 4 is a schematic cross-sectional structure diagram along the B-B direction of Fig. 2 .

Fig. 5 is a schematic cross-sectional structure diagram along the B'-B' direction of Fig. 2 .

Fig. 6 is a schematic diagram of a three-dimensional structure of a node connection device in a preferred embodiment of the present invention.

Fig. 7 is a three-dimensional structural schematic diagram when the node connection device between two beams is connected.

Fig. 8 is a three-dimensional schematic diagram of the installed node connecting device between two beams.

Fig. 9 is a schematic perspective view of a node connection device in a preferred embodiment of the present invention.

Among them, 1, ferrule; 2, horizontal connection device; 3, vertical connection device; 4, longitudinal extension device; 5, anchor rib; 6, cantilever beam; 21, top plate; 32, side vertical plate; 41, longitudinal reinforcement; 42, stirrup; 61, fixing device; KZ1, existing column; KL1, existing beam; KL2, newly added beam.

Detailed ways

In the following description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "Top", "bottom", "inner", "outer" and "vertical" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and It is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, or operate in a particular orientation, and thus, should not be construed as limiting the invention.

In the following description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two parts. Those of ordinary skill in the art may understand the specific meanings of the above terms in the present invention based on specific circumstances.

In addition, in the following description of the present invention, unless otherwise specified, the meanings of "multiple", "multiple groups" and "multiple roots" are two or more.

The materials, reagents, devices, equipment, methods and control processes used in the following examples are common materials, reagents, devices, equipment, methods and control processes in the art without special instructions, and those skilled in the art can obtain them through commercial channels , or perform conventional settings according to specific needs, without creative labor.

In the following examples, the added chemical anchorage connecting reinforcement (i.e. anchor reinforcement) between the steel hoop and the original frame column should adopt HRB335 grade or HRB400 grade ribbed reinforcement, and Q235 or Q345 grade steel screw rod can also be used. Its strength index should comply with the provisions of the current national standard "Code for Design of Concrete Structures" (GB50010-2002). The diameter of the anchorage bar should be determined by calculation. Generally, it should not be less than 12mm, nor should it be greater than 16mm. If the diameter is too large, it will lead to reinforcement construction. Increased difficulty;

At the same time, in order to increase the out-of-plane rigidity of the steel hoop-combined steel plates and prevent out-of-plane bending deformation of the steel plates, resulting in cracks in the beam-column connection joints, the thickness of the steel plates should not be less than 10mm. In order to improve the safety of joint connections, all steel plates The butt welds between the welded joints shall be fully penetrated, and the quality grade of the welds shall be Class I when under tension and Class II when under compression.

The present invention will be further described below in conjunction with specific examples, but the present invention is not limited by the examples.

Example 1

Figures 1-5 provide a node connection device for adding a reinforced concrete beam to an existing reinforced concrete column. Specifically, FIG. 1 is a schematic perspective view of the three-dimensional structure of the node connection device in this embodiment. FIG. 2 is a schematic top view of the structure of FIG. 1 . FIG. 3 is a schematic cross-sectional structural diagram along the A-A direction of FIG. 2 . Fig. 4 is a schematic cross-sectional structure diagram along the B-B direction of Fig. 2 . Fig. 5 is a schematic cross-sectional structure diagram along the B'-B' direction of Fig. 2 . Wherein, in Fig. 1, for the convenience of observation and display, the existing reinforced concrete column is weak in thickness at the joint connection device so that the node connection device can be nested into the concrete column and is not shown.

It can be known from Fig. 1-5 that the node connection device is a node connection device for newly adding reinforced concrete beams in four directions on the square reinforced concrete column KZ1. The node connection device includes four steel hoops 1 nested and enclosed on the existing reinforced concrete column with the outer concrete protective layer peeled off, a horizontal connection device 2, a vertical connection device 3, a longitudinal extension device 4 and multiple anchors. The fixed tendons are composed of 5 components. Among them, four steel ferrules 1 are welded and fixed to form a whole, and each steel ferrule 1 is distributed with circular through holes in a rectangular array (as shown in Figure 3-5). The anchor bar 5 is implanted on the existing reinforced concrete column through the above-mentioned circular through hole, and the function of the anchor bar 5 is to fix the steel hoop 1 . Simultaneously, since the concrete protective outer layer of the existing reinforced concrete column at the connection part needs to be peeled off before installation, the depth of peeling off is not less than the thickness of the steel hoop 1, so that the unstripped concrete protective outer layer has a certain degree of resistance to the steel hoop 1. supporting role.

On the outer surface of the steel ferrule 1, there is a connecting structure composed of a horizontal connecting device 2 and a vertical connecting device 3 in the form of horn legs. Wherein, the horizontal connection device 2 is divided into a top plate 21 and a bottom plate 22, and each of the top plate 21 and the bottom plate 22 has four pieces. The top plate 21 is an isosceles trapezoidal structure, and the edges of the four top plates 21 on the same horizontal plane are welded together, so that the four top plates 21 form an integrated ring structure, thereby improving the ability of each side to resist the shear force of the newly added concrete beam . A main vertical plate 31 is welded and fixed on the lower surface of the top plate 21 and the middle part of the upper surface of the bottom plate 22 , and a side vertical plate 32 is respectively provided on both sides of the main vertical plate 31 . Among them, the side vertical plates 32 on three sides are only connected to the lower surface of the top plate 21, and the side vertical plates 32 on the other side are connected to the lower surface of the top plate 21 and the upper surface of the bottom plate 22 at the same time (as shown in Figure 3-5) .

A longitudinal extension device 4 is welded and fixed on the upper surface of the top plate 21 and the lower surface of the bottom plate 22 , and at the same time, the longitudinal extension device 4 is also fixedly connected with the main vertical plate 31 and the side vertical plate 32 . The longitudinal connection device 4 is mainly steel longitudinal ribs 41 arranged in parallel, in order to maintain the stability of the longitudinal ribs 41, there are also steel stirrups 42 for binding them into bundles. In order to pour concrete into the reinforced cage formed by the longitudinal reinforcement 41 and the stirrup 42 to form a newly added reinforced concrete beam.

Example 2

Figure 6-8 provides a node connection device for adding reinforced concrete beams between existing reinforced concrete beams. Specifically, FIG. 6 is a schematic diagram of a three-dimensional structure of a node connection device in this embodiment. Fig. 7 is a three-dimensional schematic diagram of the connection between two beams by the node connection device in this embodiment. Fig. 8 is a three-dimensional schematic diagram of the installation of the node connection device between two beams in this embodiment.

As can be seen from Figures 6-8, the node connection device includes a steel hoop 1 surrounding the existing reinforced concrete beam KL1, and a steel hoop 1 similar to that in the embodiment is provided on the side of the hoop 1 that requires a new concrete beam KL2. The top plate 21, the bottom plate 22, the main vertical plate 31 and the side vertical plate 32 shorter than the main vertical plate 31 are connected horizontally and vertically. The difference is that the shape of the top plate 21 is a rectangular connecting plate with the same shape as that of the bottom plate 22 . The above-mentioned connection structure is correspondingly provided on the two parallel and opposite existing reinforced concrete beams KL1 that need to add reinforced concrete beams. A frame structure for filling concrete is formed by welding longitudinal ribs 21 on the connection structure, and a newly added reinforced concrete beam is formed after concrete filling (as shown in FIG. 8 ).

Example 3

Fig. 9 provides a node connection device for adding a cantilever beam at the junction of an existing reinforced concrete beam and a concrete column. Specifically, FIG. 9 is a schematic perspective view of the three-dimensional structure of the node connection device in this embodiment. It can be seen from Fig. 9 that the node connection device is to add a cantilever beam at the intersection of the existing reinforced concrete beam and the concrete column. The connection structure at the nodes is similar to that shown in Embodiment 1. The difference lies in: first, the vertical connection device 3 is only provided on one side of the newly added cantilever beam, and the vertical connection device is provided with only one main vertical plate 31 . Through holes are arranged on the main vertical plate 31, and the through holes correspondingly arranged on the vertical surface of the I-shaped steel beam as the cantilever are fixedly connected by connecting pieces such as bolts. Simultaneously, the upper surface of the I-shaped cantilever 6 is welded and fixed with the top plate 21 lower surface, and the lower surface is welded and fixed with the bottom plate 22 upper surface (the upper and lower surfaces of the main vertical plate 31 are not fixed with the horizontal connecting device).

Example 4

This embodiment provides a method for adding a reinforced concrete beam to an existing reinforced concrete column by using the node connection device described in Embodiment 1. The steps of the method are as follows:

1) Remove the four-sided concrete protective layer at the existing reinforced concrete column where the reinforced concrete beam or cantilever is to be added, exposing the existing column longitudinal reinforcement and stirrup; the peeling thickness of the protective layer is not less than the thickness of the steel hoop, so that The unpeeled part of the bottom can support the steel ferrule;

2) Calculate the number and diameter of the anchor bars to be implanted at the newly added reinforced concrete beams, and use the chemical planting method to implant the anchor bars according to the calculation results; when implanting, try to avoid interfering with the longitudinal steel bars in the existing columns Conflict with the position of the transverse stirrup;

3) Install the steel hoop with the through hole corresponding to the position of the anchor bar described in step (2) on the newly added reinforced concrete beam, and weld and fix the adjacent hoop plates into one, and then each The anchor bars are welded and fixed to the steel hoop; the thickness of the steel hoop is not less than 10mm;

4) Weld the horizontal connection device and the vertical connection device on the outside of the steel hoop;

5) welding the longitudinal reinforcement of the newly added reinforced concrete column on the horizontal connection device and the vertical connection device described in step (4), and fixing the longitudinal reinforcement with stirrups;

6) Fill the gap between the steel ferrule and the existing column with high-strength non-shrinkage concrete grouting material;

7) Pouring concrete for the newly added beams.

The above-mentioned method was actually applied in the atrium reinforcement and renovation project of Tongnange State Banquet Hotel in Harbin City. After the construction was completed, the deflection of the newly added beams and the percentage of residual deflection after unloading were measured, and the results were 1.194mm and 8.8%, respectively, less than 22.25mm (L/400) and 15% of the technical requirements, and there are no cracks in the newly added beams and floors. It shows that the structural bearing capacity of the beam added by this method meets the standard and can meet the load requirements of use.

It should be noted that, in addition to the structures disclosed in the above specific embodiments, those skilled in the art can make adaptive adjustments to the structure of the node connection device according to specific working conditions. For example, for a circular column, the steel ferrule 1 can be adjusted to be circular or the like.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be defined by the claims.

Claims (10)

1. A node connection device for adding new beams on existing reinforced concrete column beams, characterized in that it comprises nested hoops (1) and hoops ( 1) The horizontal connection device (2) and the vertical connection device (3) fixedly connected, the anchor ribs (5), and the newly added beam support fixedly connected with the horizontal connection device (2) and the vertical connection device (3) structure; the hoop (1) is provided with a plurality of through holes, and the anchor bar (5) passes through the through holes to be fixed with the existing reinforced concrete column or beam; the hoop (1) is fixed along the existing reinforced concrete The outer peripheral surface of the column or the concrete beam is fixed to form a whole. 2. A kind of node connection device for adding new beams on existing reinforced concrete column beams according to claim 1, characterized in that, said horizontal connection device (2) comprises a plurality of horizontally arranged top plates (21) and bottom plates ( 22); multiple top plates (21) are on the same level and their edges are welded and fixed to form a ring structure. 3. A node connection device for adding new beams to existing reinforced concrete column beams according to claim 2, wherein the vertical connection device (3) is located between the top plate (21) and the bottom plate (22) In between, the vertical connection device (3) includes a main vertical plate (31) welded and fixed to the lower surface of the top plate (21) and the upper surface of the bottom plate (22), and is located on both sides of the main vertical plate (31) and at least connected to A side vertical plate (32) fixedly connected to the lower surface of the top plate (21). 4. A kind of node connection device for adding new beams on existing reinforced concrete column beams according to claim 3, characterized in that, the newly added beam support structure is connected to the upper surface of the top plate (21), the lower surface of the bottom plate (22) and The longitudinal reinforcement device (4) fixedly connected to the sides of the main vertical plate (31) and the side vertical plate (32). 5. A node connection device for adding a new beam on an existing reinforced concrete column beam according to claim 2, wherein the vertical connection device (3) includes a joint between the top plate (21) and the bottom plate (22) The cantilever beam (6) between; the cantilever beam (61) includes an I-shaped steel beam and a main vertical plate (31); the main vertical plate (31) is welded and fixed with the outer surface of the hoop (1); The upper surface of the I-shaped steel beam is welded and fixed to the lower surface of the top plate (21), and the lower surface is welded and fixed to the upper surface of the bottom plate (22). 6. A kind of node connection device for adding new beams on existing reinforced concrete column beams according to claim 5, characterized in that, the vertical surface of the I-shaped steel beam is correspondingly arranged on the main vertical plate (31) There are a plurality of through holes, and the I-shaped steel beam and the main vertical plate (31) are connected and fixed by means of a fixing device (61) passing through the through holes. 7. A node connection device for adding new beams to existing reinforced concrete column beams according to claim 1, characterized in that the anchor bars (5) are planted through through holes evenly arranged on the hoop (1). Anchored on the existing reinforced concrete column or concrete beam; or through the through hole arranged on the ferrule (1), it is welded and fixed with the reinforcement in the existing reinforced concrete column or concrete beam. 8. A node connection device for adding new beams to existing reinforced concrete column beams according to claim 1, characterized in that the outer surface of the hoop (1) is not higher than the outer surface of the existing reinforced concrete column . 9. A method for constructing newly added reinforced concrete beams using any one of claims 1-8, wherein the joint connection device is characterized in that the steps are as follows: (1) The existing reinforced concrete columns need to add reinforced concrete beams or the four-sided concrete protective layer at the cantilever beams to expose the existing column longitudinal bars and stirrups; (2) Calculate the quantity and diameter of the anchoring bars that need to be implanted at the newly added reinforced concrete beam, and implant the anchoring bars by chemical planting method according to the calculation results; (3) Install the steel hoop cover that is provided with the through hole corresponding to the position of the anchor bar described in step (2) at the newly added reinforced concrete beam, and weld and fix the adjacent hoop cover plates into one, and then each An anchor bar is welded and fixed with a steel hoop; (4) Weld the horizontal connection device and the vertical connection device on the outside of the steel hoop; (5) welding the longitudinal reinforcement of the newly added reinforced concrete column on the horizontal connection device and the vertical connection device described in step (4), and fixing the longitudinal reinforcement with stirrups; (6) Fill the gap between the steel ferrule and the existing column with high-strength non-shrinkage concrete grouting material; (7) Pouring concrete for the newly added beams. 10. The method according to claim 9, characterized in that the thickness of the steel ferrule is not less than 10mm.