CN115182451A - A prefabricated node suitable for the connection of hollow sandwich concrete-filled steel tubular members - Google Patents

Abstract

The invention relates to an assembled node suitable for connecting hollow sandwich concrete-filled steel tube members, which comprises a node frame, a connecting steel plate and an annular steel plate, wherein the connecting steel plate is arranged on the node frame; the annular steel plate is fixed at the end part of the hollow sandwich steel tube concrete member and is welded with the inner steel tube and the outer steel tube of the hollow sandwich steel tube concrete member, the inner edge extends into the inner steel tube, and the outer edge extends out of the outer steel tube; the annular steel plate is provided with two circles of bolt holes, the outer circle of bolt holes are positioned on the outer side of the outer steel pipe, and the inner circle of bolt holes are positioned on the inner side of the inner steel pipe; the connecting steel plate is fixed on the node frame; and two circles of bolt holes are arranged on the connecting steel plate and correspond to the two circles of bolt holes of the annular steel plate, so that the connecting steel plate is connected with the annular steel plate through bolts. The inner side and the outer side of the member are connected by the bolts, so that the uniform stress is realized, the assembly and the disassembly are convenient, the effect of connecting a plurality of members on the same node is realized, and the invention belongs to the technical field of the connecting structure of hollow sandwich steel tube concrete members.

Description

A prefabricated node suitable for the connection of hollow interlayer concrete-filled steel tubular members

technical field

The invention relates to a connection structure of a hollow interlayer concrete-filled steel tube member, in particular to a prefabricated node suitable for the connection of a hollow interlayer concrete-filled steel tube member.

Background technique

Due to the restraint of the outer steel tube on the sandwich concrete and the support of the inner steel tube to the sandwich concrete, the hollow sandwich concrete-filled steel tubular column exhibits excellent mechanical properties, and can be used in industrial and civil buildings, bridges, towers and other structures. For the connection of hollow sandwich CFST members, if the connection method of CFST members is simply used, due to technological defects, only the steel pipes outside the members are connected, and the inner steel pipes cannot be connected to the nodes, resulting in uneven connection between the members and the nodes. Security risks.

According to the connection form of the existing hollow sandwich CFST members, the current connection between the hollow sandwich CFST members is the flange connection or the flange connection of the outer steel tube welded stiffener, that is, the outer steel tube welded flange, the two flanges. Butt joints are locked by a ring of bolts located outside the outer steel tube. The two connection forms have certain limitations, which are embodied as: (1) the two connection forms can only connect components in the same direction, and cannot satisfy the connection of components in multiple directions in one node; (2) the two connection forms only Bolts can be used on the outer steel pipe side of the hollow sandwich CFST member, but the inner steel pipe side cannot be connected, resulting in uneven stress on the joints.

SUMMARY OF THE INVENTION

Aiming at the technical problems existing in the prior art, the purpose of the present invention is to provide a prefabricated node suitable for the connection of hollow interlayer concrete-filled steel tubular members, which is connected by bolts on both the inside and the outside, so that the force is more uniform.

In order to achieve the above object, the present invention adopts the following technical solutions:

A prefabricated node suitable for the connection of hollow interlayer CFST members, comprising a node frame, a connecting steel plate, and an annular steel plate; the annular steel plate is fixed at the end of the hollow interlayer CFST member, and is connected with the inner and outer steel pipes of the hollow interlayer CFST member. Both are welded, and the inner edge extends to the inside of the inner steel pipe, and the outer edge extends to the outside of the outer steel pipe; there are two bolt holes on the annular steel plate, the bolt holes of the outer ring are located outside the outer steel pipe, and the bolt holes of the inner ring are located inside the inner steel pipe; connecting steel plates It is fixed on the node frame; the connecting steel plate is provided with two circles of bolt holes, which correspond to the two circles of bolt holes of the annular steel plate, so that the connecting steel plate and the annular steel plate are connected by bolts.

As a preference, the number of connecting steel plates is six, which are divided into end steel plates and side steel plates. The end steel plates are arranged at the upper and lower ends of the node frame, and the side steel plates are arranged at the front, rear, left and right sides of the node frame. side.

As a preference, the node frame includes a central steel pipe, two middle steel plates, a plurality of square stiffeners, and a plurality of triangular stiffeners; the middle steel plate is sleeved outside the central steel pipe, and is welded and fixed with the central steel pipe, and the end steel plates are welded At the upper and lower ends of the central steel pipe, the two end steel plates and the two middle steel plates are parallel to each other; the central steel pipe is located inside the bolt holes of the inner ring of the end steel plates; the front, rear, left and right sides of the end steel plates and the middle steel plates All have four straight edges. For the same end steel plate or middle steel plate, the four straight edges are located on the same square. For the same side of the two end steel plates and the two middle steel plates, the four straight edges are aligned so that the side steel plate is welded on the same side. On four straight edges; square stiffeners are welded between the end steel plates and the middle steel plates, square stiffeners are welded between the two middle steel plates, triangular stiffeners are welded between the side steel plates and the end steel plates, and the side steel plates and the middle steel plate are welded Triangular stiffeners; square stiffeners and triangular stiffeners are staggered from the bolt holes connecting the steel plates.

As a preference, for the same end steel plate or middle steel plate, two adjacent straight edges are connected by concave arcs.

As a preferred option, after the assembly of the adjacent side steel plates, a gap is left for extending into the tool for bolt tightening operation.

As a preference, one layer of square stiffeners is arranged between the upper end steel plate and the upper middle steel plate, between the upper middle steel plate and the lower middle steel plate, and between the lower middle steel plate and the lower end steel plate. The number of ribs is multiple, evenly distributed around the circumference of the central steel pipe, and the inner side of the square stiffening rib is welded on the outer side wall of the central steel pipe.

As a preference, the upper end surface of the upper end steel plate, the upper end surface of the upper middle steel plate, the lower end surface of the upper middle steel plate, the upper end surface of the lower middle steel plate, the lower end surface of the lower middle steel plate, and the lower end surface of the lower end steel plate are all provided with One layer of triangular stiffeners, in each layer, the number of triangular stiffeners is eight, two on each side, and the outer right-angled sides of the triangular stiffeners are welded to the inner side of the side steel plate.

As a preference, the number of hollow sandwich concrete-filled steel tubular members is six, and each hollow sandwich-filled concrete-filled steel tube member whose ends are welded with annular steel plates is connected with a connecting steel plate by bolts.

As a preference, both the inner steel pipe and the outer steel pipe are round pipes; the annular steel plate is annular, and the bolt holes of the inner and outer rings of the annular steel plate are uniformly distributed along the circumference and arranged concentrically.

As a preference, the materials of the node frame, the connecting steel plate and the annular steel plate are all steel.

The principle of the present invention is to design a prefabricated node suitable for the connection of hollow interlayer concrete-filled steel tubular members by utilizing the characteristics of steel with light weight and easy processing and installation. The interlayer CFST components are connected to achieve the effect of detachable assembly, and there are bolt connections on the inside and outside of the hollow sandwich CFST components to ensure the uniformity of force transmission and avoid stress concentration.

The present invention has the following advantages:

1. There are bolt connections on the inside and outside of the hollow sandwich concrete-filled steel tubular member to achieve uniform stress.

2. Only need to weld the annular steel plate at the end of the hollow sandwich CFST member, and the hollow sandwich CFST member can be bolted to the main frame of the node, which is convenient for installation and disassembly, and achieves the effect of an assembled node.

3. The effect of connecting multiple hollow interlayer CFST members on the same node is realized, up to six directions, even if the hollow interlayer CFST member is a round tube.

4. The setting of square stiffeners and triangular stiffeners makes the joints meet the bearing capacity requirements without buckling failure. Its special arrangement, while ensuring the stiffness of the joints, leaves room for bolt tightening operations.

5. The overall structure is simple, and this node does not have too many components, which is more convenient for production, processing and installation. It adopts welding and bolt connection, the connection form is simple, the processing and installation are convenient, and the purpose of on-site installation can be achieved.

6. Made of all-steel, the construction technology is simple and durable.

Description of drawings

Fig. 1 is a perspective view of a central steel pipe.

FIG. 2 is a schematic view of welding end steel plates and middle steel plates on the basis of FIG. 1 .

FIG. 3 is a schematic diagram of welding a square stiffener on the basis of FIG. 2 .

FIG. 4 is a schematic diagram of welding a triangular stiffener and a side steel plate on the basis of FIG. 3 .

FIG. 5 is an application scenario diagram of the present invention.

Figure 6 is a nodal finite element simulation diagram.

Among them, 1 is a ring steel plate, 2 is an end steel plate, 3 is a side steel plate, 4 is a middle steel plate, 5 is a central steel pipe, 6 is a square stiffener, 7 is a triangular stiffener, 8 is a straight edge, and 9 is an arc. 10 is a hollow sandwich steel tube concrete member, and 11 is a bolt hole.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments.

Example 1

A prefabricated node suitable for the connection of hollow interlayer CFST members, comprising a node frame, a connecting steel plate, and an annular steel plate; the annular steel plate is fixed at the end of the hollow interlayer CFST member, and is connected with the inner and outer steel pipes of the hollow interlayer CFST member. Both are welded, and the inner edge extends to the inside of the inner steel pipe, and the outer edge extends to the outside of the outer steel pipe; there are two bolt holes on the annular steel plate, the bolt holes of the outer ring are located outside the outer steel pipe, and the bolt holes of the inner ring are located inside the inner steel pipe; connecting steel plates It is fixed on the node frame; the connecting steel plate is provided with two circles of bolt holes, which correspond to the two circles of bolt holes of the annular steel plate, so that the connecting steel plate and the annular steel plate are connected by bolts.

The number of connecting steel plates is six, which are divided into end steel plates and side steel plates. The end steel plates are arranged on the upper and lower ends of the node frame, and the side steel plates are arranged on the front, rear, left and right sides of the node frame.

The node frame includes a central steel pipe, two middle steel plates, multiple square stiffeners, and multiple triangular stiffeners; the middle steel plate is sleeved outside the central steel pipe and is welded and fixed with the central steel pipe, and the end steel plates are welded to the upper end of the central steel pipe. and the lower end, the two end steel plates and the two middle steel plates are parallel to each other; the center steel tube is located inside the bolt hole of the inner ring of the end steel plate; the front, rear, left and right sides of the end steel plate and the middle steel plate are all four straight edges , for the same end steel plate or middle steel plate, the four straight sides are located on the same square, and for the same side of the two end steel plates and the two middle steel plates, the four straight edges are aligned so that the side steel plates are welded on the four straight edges; A square stiffener is welded between the end steel plate and the middle steel plate, a square stiffener is welded between the two middle steel plates, a triangular stiffener is welded between the side steel plate and the end steel plate, and a triangular stiffener is welded between the side steel plate and the middle steel plate; Stiffeners and triangular stiffeners are staggered from the bolt holes connecting the steel plates.

For the same end steel plate or middle steel plate, two adjacent straight edges are connected by concave arcs.

After assembly, the adjacent side steel plates have a gap for reaching into the tool for bolt tightening operations.

One layer of square stiffeners is arranged between the upper end steel plate and the upper middle steel plate, between the upper middle steel plate and the lower middle steel plate, and between the lower middle steel plate and the lower end steel plate, and the number of square stiffeners in each layer is more The blocks are evenly distributed around the circumference of the central steel pipe, and the inner side of the square stiffener is welded on the outer side wall of the central steel pipe.

The upper end face of the upper end steel plate, the upper end face of the upper middle steel plate, the lower end face of the upper middle steel plate, the upper end face of the lower middle steel plate, the lower end face of the lower middle steel plate, and the lower end face of the lower end steel plate are provided with a layer of triangular stiffeners , In each layer, the number of triangular stiffeners is eight, two on each side, and the outer right-angle side of the triangular stiffener is welded to the inner side of the side steel plate.

The number of hollow interlayer CFST members is six, and each hollow interlayer CFST member whose ends are welded with annular steel plates is connected with a connecting steel plate through bolts.

The inner steel pipe and the outer steel pipe are both circular pipes; the annular steel plate is circular, and the bolt holes of the inner and outer rings of the annular steel plate are uniformly distributed along the circumference and arranged concentrically.

The materials of node frame, connecting steel plate and annular steel plate are all steel.

In this embodiment, a certain design size is taken as an example. The outer diameter of the central steel pipe is 540mm, the wall thickness is 10mm, and the height is 680mm, as shown in Figure 1; The middle steel plate is inserted into the central steel pipe from the central opening, and one piece is arranged every 170mm along the height direction. The middle steel plate and the end steel plate and the central steel pipe are connected by welding the upper and lower openings of the steel plate to the steel pipe, and the upper and lower end steel plates are opened. Two circles of bolt holes, the diameter of the bolt holes is 10mm, and 8 bolt holes are opened in the inner and outer circles in each 45° direction, as shown in Figure 2; the square stiffener is welded, and the square stiffener is placed in the middle of the bolt hole angle. In order to avoid the use of blocking bolts connected to the components later, 8 square stiffeners are placed on each layer, and the square stiffeners are connected to the middle and end steel plates by welding. The specific arrangement is shown in Figure 3; the four side steel plates are all bolt holes. The opening method is the same as that of the end steel plate. The side steel plate has a side length of 1000mm and a thickness of 20mm. The adjacent sides are not connected by inner fillets. The steel plates are connected by welding, and then triangular stiffeners are added. The triangular stiffeners are placed at the edge of the fillet. All the connection methods are welded connections. The specific layout is shown in Figure 4. When installing the hollow sandwich CFST member, the annular steel plate is welded at the end of the hollow sandwich CFST member, and the hollow sandwich CFST member can be connected with the connecting steel plate through two rings of bolts, as shown in Figure 5.

In addition, finite element modeling is used to simulate this node, and the ultimate bearing capacity of hollow sandwich concrete-filled steel tubular members is applied to the six surfaces of the member to verify whether such members have large deformation or reach the ultimate strength. The simulation results are shown in Figure 6. Since the steel adopts Q390, it can be seen from the stress cloud diagram that the steel of the joints meets the ultimate bearing strength, so this type of joint is feasible. It can be seen from the simulation results that the joints are connected to the steel plate by two bolts inside and outside, and the force is uniform.

Embodiment 2

In this embodiment, only three hollow sandwich CFST members are used, and the ends of each hollow sandwich CFST member are welded with annular steel plates. Among the three hollow sandwich CFST members, two are bolted to the end steel plates, and one is connected to the side steel plates. Bolted.

The parts not mentioned in this embodiment are the same as those in the first embodiment.

Embodiment 3

In this embodiment, the inner and outer steel pipes of the CFST component of the hollow sandwich steel tube are both square, the annular steel plate is a square ring, the inner and outer ring bolts of the annular steel plate are arranged along the square, and the inner and outer ring bolts of the connecting steel plates are along the Square arrangement. The number of hollow sandwich concrete-filled steel tubular members is six. The central steel pipe is a square tube, and the square stiffeners are arranged along the square ring.

The parts not mentioned in this embodiment are the same as those in the first embodiment.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (10)

1. The utility model provides an assembled node suitable for cavity intermediate layer steel pipe concrete member connects which characterized in that: the node frame comprises a node frame, a connecting steel plate and an annular steel plate; the annular steel plate is fixed at the end part of the hollow sandwich layer steel tube concrete member and is welded with the inner steel tube and the outer steel tube of the hollow sandwich layer steel tube concrete member, the inner edge extends into the inner steel tube, and the outer edge extends out of the outer steel tube; the annular steel plate is provided with two circles of bolt holes, the outer circle of bolt holes are positioned on the outer side of the outer steel pipe, and the inner circle of bolt holes are positioned on the inner side of the inner steel pipe; the connecting steel plate is fixed on the node frame; the connecting steel plate is provided with two circles of bolt holes which correspond to the two circles of bolt holes of the annular steel plate, so that the connecting steel plate is connected with the annular steel plate through bolts.

2. An assembled node suitable for hollow sandwich steel tube concrete member connection according to claim 1, characterized in that: the number of connecting steel plates is six, divide into tip steel sheet and side steel sheet, and the tip steel sheet sets up in the upper and lower both ends of node frame, and the side steel sheet sets up in the front, back, left and right side of node frame.

3. The fabricated node suitable for hollow sandwich concrete-filled steel tube member connection according to claim 2, characterized in that: the node frame comprises a central steel pipe, two middle steel plates, a plurality of square stiffening ribs and a plurality of triangular stiffening ribs; the middle steel plate is sleeved outside the central steel tube and is welded and fixed with the central steel tube, the end steel plates are welded at the upper end and the lower end of the central steel tube, and the two end steel plates are parallel to the two middle steel plates; the central steel pipe is positioned on the inner side of the inner ring bolt hole of the end steel plate; the front side, the rear side, the left side and the right side of the end steel plate and the middle steel plate are all four straight edges, for the same end steel plate or middle steel plate, the four straight edges are positioned on the same square, and for the same side of the two end steel plates and the two middle steel plates, the four straight edges are aligned, so that the side steel plates are welded on the four straight edges; a square stiffening rib is welded between the end steel plate and the middle steel plate, a square stiffening rib is welded between the two middle steel plates, a triangular stiffening rib is welded between the side steel plate and the end steel plate, and a triangular stiffening rib is welded between the side steel plate and the middle steel plate; the square stiffening ribs and the triangular stiffening ribs are staggered with the bolt holes of the connecting steel plates.

4. A fabricated node suitable for hollow sandwich steel tube concrete structural member connection according to claim 3, wherein: for the same end steel plate or middle steel plate, two adjacent straight edges are connected through an inwards concave arc.

5. An assembled node suitable for hollow sandwich steel tube concrete member connection according to claim 4, characterized in that: and a gap is reserved between the adjacent side steel plates after assembly, and the adjacent side steel plates are used for extending into a tool to perform bolt fastening operation.

6. A fabricated node suitable for hollow sandwich steel tube concrete structural member connection according to claim 3, wherein: between upper end portion steel sheet and the upper middle part steel sheet, between upper middle part steel sheet and the lower floor middle part steel sheet, respectively set up the square stiffening rib of one deck between lower floor middle part steel sheet and the lower floor tip steel sheet, in every layer, the quantity of square stiffening rib is the polylith, encircles central steel pipe circumference equipartition, and the inboard welding of square stiffening rib is on the lateral wall of central steel pipe.

7. A fabricated node suitable for hollow sandwich steel tube concrete structural member connection according to claim 3, wherein: the up end of upper end portion steel sheet, the up end of upper middle part steel sheet, the lower terminal surface of upper middle part steel sheet, the up end of lower floor middle part steel sheet, the lower terminal surface of lower floor's tip steel sheet all set up one deck triangle-shaped stiffening rib, and in every layer, the quantity of triangle-shaped stiffening rib is eight, and every side sets up two, and the outside right angle limit welding of triangle-shaped stiffening rib is in the inboard of side steel sheet.

8. An assembled node suitable for hollow sandwich steel tube concrete member connection according to claim 2, characterized in that: the number of the hollow sandwich layer concrete-filled steel tube members is six, and each hollow sandwich layer concrete-filled steel tube member with the end part welded with the annular steel plate is connected with one connecting steel plate through a bolt.

9. The fabricated node suitable for hollow sandwich concrete-filled steel tube member connection according to claim 1, characterized in that: the inner steel pipe and the outer steel pipe are both round pipes; the annular steel plate is ring-shaped, and the inner ring bolt holes and the outer ring bolt holes of the annular steel plate are uniformly distributed along the circumference and concentrically arranged.

10. The fabricated node suitable for hollow sandwich concrete-filled steel tube member connection according to claim 1, characterized in that: the node frame, the connecting steel plate and the annular steel plate are all made of steel.

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