CN114458043A - A connection structure of newly added steel beams and existing concrete columns and construction method thereof - Google Patents

Abstract

The invention relates to a connection structure of a newly added steel beam and an existing concrete column and a construction method thereof, belonging to the technical field of building structure engineering. The structure includes a first hoop and a second hoop which are sheathed on an existing concrete column, and is characterized in that the first hoop and the second hoop are connected by N connecting plates, and the first hoop is fixedly connected to the outside The first annular anti-bending plate, the second annular hoop is fixedly connected to the second annular anti-bending plate, the first annular anti-bending plate and the second annular anti-bending plate extend outward at the same position to form a rib plate, and the two ribs are The plates are connected by vertical webs, and the vertical webs are fixedly connected with one of the connecting plates. The structure does not need to implant a large number of anchor bolts in the intensive area of beam-column joints, which greatly reduces the difficulty of construction, does not damage the original structure, and avoids weakening the bearing capacity of the original structure.

Description

A connection structure of newly added steel beams and existing concrete columns and construction method thereof

technical field

The invention belongs to the technical field of building structure engineering, in particular to a connection structure of a newly added steel beam and an existing concrete column and a construction method thereof.

Background technique

At present, in the reinforcement and transformation of the structure, due to the advantages of light weight, high strength, and easy construction, steel structure has become the preferred structural form for adding layers to existing structures. When adding steel beams, if the original structural columns are steel columns, additional Steel beams are easier. If the original structure is a concrete column, it is more troublesome. If the beam-column is hinged connection, just connect the new steel beam web to the column. If the beam-column is rigidly connected, the web flange is required to be connected to the concrete column. connect. The usual practice is to connect the newly added steel beams with the existing columns through post-embedded parts to form rigid joints, but this type of joint requires the use of a large number of anchor bolts or post-planting reinforcement, which will cause great damage to the original structural joint area. , In general, the beam-column joint area of the structure is more complex and the steel bars are denser, and some existing frame columns are reinforced concrete columns, which will make it difficult for anchor bolts or post-planting bars to penetrate into the columns, making construction difficult.

SUMMARY OF THE INVENTION

In order to solve the technical problems existing in the prior art, the present invention provides a connection structure of a newly added steel beam and an existing concrete column and a construction method thereof. Under the premise of ensuring the reliability and safety of the connection between the new steel beam and the existing column, the connection structure avoids the damage to the existing structure and the difficulty of post-planting reinforcement in the beam-column joint area. The predicament of dense reinforcement and difficulty in planting reinforcement makes construction more convenient and feasible.

The invention provides a connection structure between a newly added steel beam and an existing concrete column, including a first hoop and a second hoop sleeved on the existing concrete column, characterized in that the first hoop and the second hoop They are connected by N connecting plates, the first hoop is externally fixedly connected to the first annular anti-bending plate, the second hoop is externally fixedly connected to the second annular anti-bending plate, the first annular anti-bending plate and the second annular anti-bending plate are fixedly connected to the outside. The plates extend outward at the same position to form rib plates, and the two rib plates are connected by a vertical web, and the vertical web is fixedly connected with one of the connecting plates.

Further, the first hoop and the second hoop are provided with clamping grooves at the same position that can be clamped into the existing beams on the existing concrete columns, and the N connecting plate steel plates are evenly distributed on both sides of the clamping grooves.

Further, the adjacent annular edges of the first hoop and the second hoop are concavely formed at the same position.

Further, the connecting plate is a strip steel plate.

Further, one end of the vertical web away from the connecting plate is connected to the steel beam fixing plate, and the cantilever end of the steel beam fixing plate is provided with several bolt holes.

Further, the first annular anti-bending plate and the second annular anti-bending plate are welded and fixed on the hoop;

Or/and, the connecting plate is welded and fixed on the hoop;

Or/and, the web, the connecting plate and the annular anti-bending plate are welded and fixed.

Further, the connecting plate is an arc-shaped plate and has the same thickness as the hoop.

The present invention also provides a construction process based on the connection structure of a new steel beam and an existing concrete column described in any of the above, and the construction process includes the following processes:

The first annular anti-bending plate and the second annular anti-bending plate are welded and fixed on the corresponding hoop in advance, and each hoop is divided into two sections;

During construction, the two sections of the first hoop are now put on the existing concrete column, welded and fixed, and fixed on the concrete by bolts, and a connecting plate is welded at the bottom of the first hoop, and the connecting plate and The vertical web is welded between the ribs of the annular bending plate;

Then set the two sections of the second hoop on the existing concrete column, attach the rib plate of the second annular anti-bending plate at the bottom of the vertical web, and then weld the remaining connecting plates on the first hoop. Between the second hoop and the second hoop, the second hoop is fixed on the concrete column by bolts.

Further, after welding the connecting plates, inject structural glue between the concrete column and the hoop.

Beneficial effects of the present invention:

(1) In the connection structure of the newly added steel beam provided by the present invention and the existing concrete column, a flexural ring plate is respectively welded on the outer wall surfaces of the first hoop and the second hoop, and between the upper and lower flexural ring plates A rib is protruded at the same position, the upper and lower ribs are connected by a web, and the web is fixedly connected to a strip steel plate in the upper and lower hoop, so that when installing a new steel beam, the newly added steel beam can be directly connected. The webs and flanges of the steel beams are fixed with the webs and ribs in the structure, and the bending moment generated by the newly added steel beams is resisted by the annular hoop and the anti-bending ring plate. Shaped steel plates are used to resist the shear force generated by the newly added steel beams, and the remaining strip-shaped steel plates can improve the stability of the existing concrete columns.

(2) The connection structure of the newly added steel beam and the existing concrete column provided by the present invention reduces the usage of anchor bolts or post-planting reinforcement, and does not need to implant anchor bolts or post-planting reinforcement in the intensive area of the beam-column joint, greatly reducing the need for The construction difficulty is reduced, rapid assembly can be achieved, and damage to the original structure can be avoided and the bearing capacity of the original structure can be weakened.

Description of drawings

Figure 1. Front view of a beam-column joint provided by an embodiment of the present invention;

Fig. 2. Side view of beam-column joint provided by an embodiment of the present invention;

Figure 3. A plan view of a beam-column joint provided by an embodiment of the present invention;

Figure 4. The front view of the combination of the annular steel plate hoop and the anti-bending ring plate provided by the embodiment of the present invention;

Figure 5. The combined top view of the annular steel plate hoop and the anti-bending ring plate provided by the embodiment of the present invention;

FIG. 6 is a three-dimensional schematic diagram of a node provided by an embodiment of the present invention.

Among them, 1-existing concrete columns, 2-existing structural beams, 3-new steel beams, 4-upper ring hoop, 5-lower ring hoop, 6-upper bending ring plate, 7-lower bending ring plate , 8-strip steel plate, 9-web, 10-steel beam fixing plate, 11-M12 chemical anchor bolt, 12-connecting plate, 13-high-strength bolt, 14-card slot.

Detailed ways

Referring to FIGS. 1-3 , an embodiment of the present invention provides a quick-assembled connection structure between a newly added steel beam and an existing concrete column, and the connection structure includes an upper ring hoop 4 sleeved on the existing concrete column 1 . With the lower annular hoop 5 , the upper annular hoop 4 and the lower annular hoop 5 are connected by several strip steel plates 8 .

An upper anti-bending ring plate 6 is fixed on the outer wall surface of the upper annular hoop 4 , and a lower anti-bending ring plate 7 is fixed on the outer wall surface of the lower annular hoop 5 .

The upper anti-bending ring plate 6 and the lower anti-bending ring plate 7 both extend outward at the same position to form a rib plate, which are respectively the upper rib plate and the lower rib plate, and a web is passed between the upper rib plate and the lower rib plate 9 is connected, the web 9 is connected with one of the strip steel plates 8 and is perpendicular to the strip steel plate 8 .

Therefore, in the quick-assembled connection structure of the newly added steel beam and the existing concrete column provided by the present invention, a bending-resisting ring plate is respectively welded on the outer wall surfaces of the first hoop and the second hoop, and the upper and lower bending-resisting ring plates are respectively welded. A rib protrudes at the same position, the upper and lower ribs are connected by a web, and the web is fixedly connected with a strip-shaped steel plate in the upper and lower hoop, so that the ring hoop and the anti-bending ring plate can resist the new The bending moment generated by the added steel beam is resisted by the strip steel plate connected by the web and the web plate to resist the shear force generated by the new steel beam, and the effect of the remaining strip steel plate improves the stability of the existing concrete column. The structure reduces the use of anchor bolts, and does not need to implant anchor bolts in the dense area of beam-column joints, which greatly reduces the difficulty of construction, and can avoid damage to the original structure and weaken the bearing capacity of the original structure. .

Specifically, as shown in FIGS. 1 and 4 , an inward groove 14 is formed at the same position on the edges of the opposite ends of the upper annular hoop 4 and the lower annular hoop 5 , that is, the bottom of the upper annular hoop 4 is at A certain position is concave upward to form a clamping groove, and the top of the lower ring hoop 5 is concave downward at a certain position to form a clamping groove, and the upper and lower clamping grooves have the same size.

Generally, an existing structural beam 2 is connected to the existing concrete column 1, so that when a new steel beam 3 is installed next to the existing structural beam 2 on the existing concrete column 1, the upper ring hoop 4 can be and the clamping grooves of the lower ring hoop 5 are respectively clamped in the upper and lower parts of the newly added steel beam, so as to realize the installation of the newly added steel beam 3 on one side of the existing steel beam. The construction of structural beams will have an impact. At the same time, by setting grooves on the existing structural beams, it is possible to avoid excessive concentration of welds between the upper anti-bending ring plate, the lower anti-bending ring plate, the web and the hoop.

In this embodiment, the edge of the web 9 is directly welded and fixed on one of the strip steel plates 8, and the remaining strip steel plates 8 are preferably installed symmetrically on both sides of the symmetrical plane with the web 9 as the facing plane, that is, in the existing The concrete is evenly distributed in the circumferential direction.

Wherein, a strip-shaped steel plate can be separately arranged on both sides of the card slot, so as to avoid the problem of stress concentration on the edge of the card slot.

In this embodiment, the strip-shaped steel plate connecting the upper annular hoop 4 and the lower annular hoop 5 is an arc-shaped plate. When installing the strip-shaped steel plate, the inner wall of the strip-shaped steel plate is in close contact with the outer wall of the concrete column. After the strip steel plate, the structural glue can be filled between the strip steel plate and the concrete column.

The number of strip steel plates needs to be determined according to the diameter of the existing concrete column, and the distance between two adjacent strip steel plates is the same.

Of course, the shape of the strip-shaped steel plate 8 in the present invention is not limited to the arc-shaped plate in this embodiment, but can also be other shapes, as long as the upper ring hoop and the lower ring hoop can be connected together.

There is a certain distance between adjacent strip steel plates, and the distance is the same. Compared with directly connecting the upper ring hoop 4 and the lower ring hoop 5 with steel plates, this form can ensure the safety of the node area. It can save a lot of steel and effectively reduce the cost.

Preferably, the upper and lower ends of the strip-shaped steel plate 8 are welded and fixed to the upper annular hoop 4 and the lower annular hoop 5 respectively to enhance the stability between the two.

Referring to FIG. 1 and FIG. 5 , the upper and lower anti-bending ring plates 6 and 7 in this embodiment extend outward at the same position to form rib plates, and the upper and lower rib plates are connected by a web 9 . The rib plate is a rectangular plate, and the length of the specific rib plate needs to be determined according to parameters such as the length and weight of the newly added steel beam 3 to be installed.

Preferably, the upper anti-bending ring plate 6 in this embodiment should be close to the lower side of the upper annular hoop, and the lower anti-bending ring plate 7 should be close to the upper side of the lower annular hoop.

One end of the web plate 9 away from the strip steel plate is connected with a steel beam fixing plate 10, wherein the steel beam fixing plate 10 and the surface of the web plate 9 are connected by high-strength bolts, and the other end of the steel beam fixing plate 10 is provided with some bolt holes. When installing the newly added steel beam, the steel beam fixing plate can be connected with the web plate of the newly added steel beam, and at the same time, the rib plate can be connected with the flange plate of the newly added steel beam through the connecting plate 12 .

The steel beam fixing plate 10 can be one or two, and when there are two, it is symmetrically installed on the two surfaces of the web.

The following is a detailed description of the construction method based on the above-mentioned quick-assembled connection structure of a newly added steel beam and an existing concrete column. The construction method includes the following processes:

The upper anti-bending ring plate 6, the lower anti-bending ring plate 7, the upper annular hoop 4 and the lower annular hoop 5 are pre-processed in the factory, and then the upper anti-bending ring plate 6 is welded and fixed on the upper annular hoop 4, and the lower anti-bending ring The plate 7 is welded and fixed on the lower annular hoop 5. After the welding is completed, the entire upper annular hoop and the entire lower annular hoop are respectively divided into two sections; as shown in Figure 5, when dividing, ensure that the protruding ribs in the anti-bending ring plate are The board is in one of the segments.

It should be noted that, if the connection structure is installed on the existing steel beam 2 on one side of the existing concrete column 1 , the clamping groove 14 can be processed in advance, wherein the width of the clamping groove 14 is equal to the thickness of the existing steel beam 2 .

During construction, first connect the two sections of the upper ring hoop 4 on the existing concrete column to ensure that it is sleeved on the existing concrete column 1, then weld and fix it, and use the upper M12 chemical anchor bolt 11 to resist bending The upper side of the ring plate 6 is fixed for one week; the strip steel plate 8 is welded and fixed at the position where the web plate 9 needs to be installed, and then the web plate 9 is installed to ensure that the top of the web plate 9 is welded and fixed with the ribs protruding from the upper anti-bending ring plate. At the same time, ensure that the side of the web is fixed with the fixed strip steel plate;

After the web is preliminarily installed, the two sections of the lower ring hoop 5 are butted and fixed on the outer wall of the concrete column. First, ensure that the upper surface of the lower anti-bending ring plate 7 is welded and fixed with the bottom of the web, and then use a small amount of M12 chemical. The anchor bolt 11 can fix the lower annular hoop 5. After fixing the web 9, the remaining strip steel plates can be welded and fixed. Finally, the existing concrete column 1, the upper annular hoop 4, the lower annular hoop 5 and the Structural glue is injected between the strip steel plates 8 to fill the gaps.

After the construction is completed, if the new steel beam 3 needs to be installed, the new steel beam 3 can be hoisted, and the upper and lower flanges of the new steel beam are connected to the upper and lower anti-bending ring plates through a connecting plate 12 respectively. The ribs are connected together, and the web is connected with the web of the newly added steel beam through two steel beam fixing plates, and is fixed by high-strength bolts, as shown in Figure 6

Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present invention. Those skilled in the art should understand that on the basis of the technical solutions of the present invention, those skilled in the art do not need to pay creative work. Various modifications or deformations that can be made are still within the protection scope of the present invention.

Claims (10)

1. The utility model provides a connection structure of newly-increased girder steel and existing concrete column, includes first hoop and the second hoop of suit at existing concrete column, its characterized in that is connected through N connecting plate between first hoop and the second hoop, the first annular bending resistance board of first hoop external fixation connection, the second annular bending resistance board of second hoop external fixation connection, first annular bending resistance board and second annular bending resistance board all outwards extend the formation gusset in the same position, and be connected through vertical web between two gussets, vertical web and one of them connecting plate fixed connection.

2. The connection structure of a newly added steel beam and an existing concrete column as claimed in claim 1, wherein the first hoop and the second hoop are provided with a slot capable of being clamped into an existing beam on the existing concrete column at the same position, and the N connecting plate steel plates are uniformly distributed on both sides of the slot.

3. The connection structure of a newly added steel beam and an existing concrete column as claimed in claim 2, wherein the annular edges of the first hoop and the second hoop which are butted are recessed in the same position to form the clamping groove.

4. The connection structure of a newly-added steel beam and an existing concrete column as claimed in claim 2, wherein the connection plate is a strip steel plate.

5. The connection structure of a newly-added steel beam and an existing concrete column as claimed in claim 1, wherein the N connecting plates are arranged on two sides of the symmetry plane uniformly by taking the vertical web plates as a counterpoint plane.

6. The connection structure of an added steel beam and an existing concrete column as claimed in claim 1, wherein one end of the vertical web, which is far away from the connecting plate, is connected with a steel beam fixing plate, and a plurality of bolt holes are formed in a cantilever end of the steel beam fixing plate.

7. The connection structure of a newly added steel beam and an existing concrete column according to claim 1, wherein the first annular bending-resistant plate and the second annular bending-resistant plate are welded and fixed on the hoop;

or/and the connecting plate is fixed on the hoop in a welding way;

or/and the web plate is fixedly welded with the connecting plate and the annular bending-resistant plate.

8. The connection structure of a newly-added steel beam and an existing concrete column as claimed in claim 1, wherein the connection plates are arc-shaped plates and have the same thickness as the hoop.

9. The construction method of the connection structure of the newly-added steel beam and the existing concrete column based on any one of claims 1 to 8,

welding and fixing a first annular bending-resistant plate and a second annular bending-resistant plate on corresponding hoops in advance, and dividing each hoop into two sections;

during construction, two sections of the first hoop are sleeved on an existing concrete column, welded and fixed, and fixed on concrete through bolts, a connecting plate is welded at the bottom of the first hoop, and a vertical web plate is welded between the connecting plate and a rib plate of the annular bending-resistant plate;

and sleeving two sections of the second hoop on the existing concrete column, arranging a rib plate of a second annular bending-resistant plate at the bottom of the vertical web plate, welding and fixing the rest connecting plates between the first hoop and the second hoop, and fixing the second hoop on the existing concrete column through bolts.

10. The construction method according to claim 9, wherein structural glue is injected between the existing concrete column and the hoop after the welding of the connection plates.

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