Connecting joint of prestressed concrete beam and steel reinforced concrete column

Abstract

The invention relates to a connecting joint of a prestressed concrete beam and a steel reinforced concrete column. The connecting joint comprises the prefabricated steel reinforced concrete column with an overhanging short beam, the prefabricated prestressed concrete beam, a flange plate, bolts, embedded anchor bars, embedded profile steel and prestressed bars. The pre-embedded profile steel and the pre-stressed rib pipes are respectively arranged in the overhanging short beams; the end parts of the overhanging short beam and the prefabricated prestressed concrete beam are fixedly connected through a flange plate; the embedded anchor bars are arranged in the prefabricated prestressed concrete beams; one end of the pre-embedded profile steel extends to the outer part of the overhanging short beam to form a profile steel tenon; tooth grooves correspondingly spliced with the profile steel tenons are formed in the inner ends of the prefabricated prestressed concrete beams. The prestressed tendons are arranged in the prestressed tendon pipes and extend into the prefabricated prestressed concrete beam. The bearing advantages of the prestressed concrete structure and the steel reinforced concrete structure can be brought into full play, large deformation of the soft rock tunnel can be resisted, and safe and flexible supporting measures are provided.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, and in particular to a connection node between a prestressed concrete beam and a steel-concrete column. Background Art

[0002] With the continuous development of underground engineering in my country, there are many different underground structure forms for different geological conditions, such as underground frame structure, thin shell structure of underground oil depot and large-span support structure for highway tunnels in soft soil layers. The nodes are often connected by bolts or sleeves.

[0003] However, for underground projects in soft soil with strong ground pressure and large deformation, there are often problems such as insufficient structural strength and node failure, which make the structural system unable to withstand large deformation and cause great losses to life and property. Therefore, it is particularly important to design a new type of high-strength and high-rigidity structural connection system suitable for underground projects.

[0004] Prestressed concrete structures are prestressed before external loads are applied, thereby offsetting the tensile stress caused by external loads and slowing down the cracking caused by insufficient tensile stiffness of concrete. Prestressed concrete can reduce the cross-sectional area of ​​beams and has good economy, aesthetics and space utilization. Steel-concrete composite columns, that is, concrete-wrapped steel composite columns, are one of the important categories of steel and concrete composite structures. When pouring concrete, steel or steel pipes are pre-placed inside to enhance the structural bearing capacity. Compared with reinforced concrete columns, steel-concrete composite columns can greatly reduce the deadweight of the structure, have higher rigidity and stability, and have better fire and corrosion resistance. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a connection node between a prestressed concrete beam and a steel-concrete column. By combining a high-strength prestressed concrete structure with a steel-concrete structure, the bearing and appearance advantages of the prestressed concrete structure and the steel-concrete structure are fully utilized, which has important practical significance for resisting large deformation of tunnels and providing safe and flexible support measures.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A connection node between a prestressed concrete beam and a steel-concrete column proposed in the present invention comprises a prefabricated steel-concrete column, a prefabricated prestressed concrete beam, a flange, bolts, embedded anchor bars, embedded steel and prestressed bars; an outwardly extending short beam is arranged on one side of the prefabricated steel-concrete column; the embedded steel is correspondingly arranged inside the outwardly extending short beam; a flange is correspondingly arranged on the outer end of the outwardly extending short beam and the inner end of the prefabricated prestressed concrete beam; the embedded anchor bars are correspondingly arranged on one side of the prefabricated prestressed concrete beam close to the flange; one end of the embedded steel extends to the outside of the outwardly extending short beam to form a steel tenon; a tooth groove corresponding to the steel tenon is arranged on the inner end of the prefabricated prestressed concrete beam; the outwardly extending short beam and the prefabricated prestressed concrete beam are spliced ​​by the steel tenon and the tooth groove, and the end flanges are fixedly connected by bolts; the prestressed bars are correspondingly arranged inside the outwardly extending short beam and the prefabricated prestressed concrete beam.

[0008] Furthermore, the steel tenon and the tooth groove are bonded by construction adhesive.

[0009] Furthermore, prestressed tendon tubes are provided at positions corresponding to the prestressed tendons inside the prefabricated prestressed concrete beams and the outrigger short beams.

[0010] Furthermore, the prestressed reinforcement pipe is a PVC corrugated pipe.

[0011] Furthermore, the embedded steel is an I-beam.

[0012] Furthermore, the bolts are high-strength bolts.

[0013] Furthermore, the flange is a rectangular structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Compared with ordinary reinforced concrete structures, the present invention utilizes steel-concrete columns as load-bearing components and connects the steel-concrete columns with concrete beams to form a new frame structure. In order to further expand the span of the structure, prestressed technology is used to apply prestress in the concrete beams to solve the problems of insufficient bearing capacity and large mid-span deformation caused by the large span, greatly reduce the cross-sectional size of the components, improve the overall shear resistance and ductility of the structure, and can effectively withstand the pressure and effects brought by vertical and horizontal loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the assembly structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the top view of the structure of the present invention;

[0019] Figure 4 It is a schematic diagram of the effect of the tensioning method of prestressed tendons in the present invention.

[0020] Among them, the figure markings are: 1-prefabricated steel concrete column; 2-prefabricated prestressed concrete beam; 3-flange; 4-bolt; 5-embedded anchor bar; 6-embedded steel; 7-prestressed bar; 8-post-poured concrete; 9-prestressed bar tube. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0023] See attached Figure 1-3 The specific structure of an embodiment of a connection node between a prestressed concrete beam and a steel-concrete column proposed in the present invention is given. The connection node includes a prefabricated steel-concrete column 1, a prefabricated prestressed concrete beam 2, a flange 3, a bolt 4, an embedded anchor bar 5, an embedded steel 6 and a prestressed bar 7.

[0024] Among them, an extended short beam is arranged on one side of the prefabricated steel concrete column 1; the embedded steel 6 is preset in the extended short beam, and the remaining positions are filled with post-cast concrete; in this embodiment, the embedded steel is an I-beam; the outer end of the extended short beam and the inner end of the prefabricated prestressed concrete beam 2 are fixedly provided with a rectangular structural flange 3; the embedded anchor bar 5 is arranged around the middle of the prefabricated prestressed concrete beam 2 near the flange 3; the outer end of the embedded steel 6 extends to the outside of the outer end of the extended short beam to form a steel tenon; the inner end of the prefabricated prestressed concrete beam 2 is provided with a tooth groove corresponding to the steel tenon; the extended short beam and the prefabricated prestressed concrete beam are spliced ​​by the steel tenon and the tooth groove, and the connection between the steel tenon and the tooth groove is coated with construction glue; the prefabricated prestressed concrete beam 2 is fixedly connected to the flange at the end of the extended short beam by bolts 4. In this embodiment, the flange 3 is a rectangular structure, and the bolts 4 are high-strength bolts, and the number is fourteen.

[0025] The prestressed tendons 7 are correspondingly arranged inside the extended short beam and the precast prestressed concrete beam 2, and can be embedded in the extended short beam and the precast prestressed concrete beam 2 in a straight line or a curve, or can be embedded in the precast prestressed concrete beam 2 in a curve alone, or can be embedded in the extended short beam and the precast prestressed concrete beam 2 in a straight line while another prestressed tendon 7 is embedded in the precast prestressed concrete beam 2 in a curve, or can be embedded in other required forms.

[0026] In this embodiment, prestressed tendon tubes 9 are pre-buried at positions corresponding to the prestressed tendons 7 inside the prefabricated prestressed concrete beam 2 and the outrigger short beam; the prestressed tendon tubes 9 are all PVC corrugated tubes.

[0027] According to the embedded position of the prestressed tendon 7, different tensioning methods can be used:

[0028] like Figure 4 As shown in (a), the prestressed tendons 7 are straightly tensioned in the middle of the column end to achieve a more effective connection between the beam and column nodes and improve the bearing capacity of the nodes;

[0029] like Figure 4 (b) shows that the prestressed tendons 7 are tensioned in the beam end curve, which effectively improves the tensile capacity of the negative bending moment area at the beam end and the positive bending moment area at the bottom of the beam;

[0030] like Figure 4 (c) shows that the prestressed tendons 7 are tensioned in a curved line inside the beam, which effectively improves the tensile strength of the bottom of the beam;

[0031] like Figure 4 As shown in (d), the prestressed tendons 7 are straightly tensioned at the bottom of the column end, so as to achieve a more effective connection between the beam-column node and improve the bearing capacity of the node and the tensile strength of the bottom of the beam;

[0032] like Figure 4 (e) shows that the prestressed tendons 7 are tensioned in a curve at the column end, achieving a more effective connection between the beam-column node and improving the bearing capacity of the node, the tensile capacity of the beam bottom and the tensile capacity of the negative bending moment zone at the beam end;

[0033] like Figure 4 As shown in (f), the prestressed tendons 7 are tensioned at the hybrid node, which is the most effective way to achieve a more effective connection between the beam-column node and improve the bearing capacity of the node.

[0034] The working principle of the present invention is that the steel concrete column is used as a load-bearing component, which can effectively withstand vertical loads, horizontal loads and large deformation of soft rocks, greatly reduce the cross-sectional size of the component, improve the shear resistance and ductility of the component, connect the steel concrete column with the concrete beam to form a new frame structure, and in order to further expand the span of the structure, the prestressing technology is used in the frame structure. By applying prestress in the concrete beam, the problems of insufficient bearing capacity and large deformation in the middle of the span caused by the large span can be effectively solved, and a large span-to-height ratio can be achieved. In particular, practical problems such as premature cracking of the concrete beam due to the large span are solved, that is, by applying prestress in the concrete beam, the cracking of the concrete is prevented and delayed, the rigidity of the large-span concrete beam is improved, and a large space structure with a large span, good bearing capacity and excellent durability is formed.

[0035] Matters not covered in the present invention are all known technologies.

[0036] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A connection node between a prestressed concrete beam and a steel-concrete column, characterized in that: It comprises a prefabricated steel concrete column, a prefabricated prestressed concrete beam, a flange, bolts, embedded anchor bars, embedded steel and prestressed bars; an outwardly extending short beam is arranged on one side of the prefabricated steel concrete column; the embedded steel is arranged correspondingly inside the outwardly extending short beam; a flange is arranged correspondingly on the outer end of the outwardly extending short beam and the inner end of the prefabricated prestressed concrete beam; the embedded anchor bars are arranged correspondingly on one side of the prefabricated prestressed concrete beam close to the flange; one end of the embedded steel extends to the outside of the outwardly extending short beam to form a steel tenon; a tooth groove corresponding to the steel tenon is arranged on the inner end of the prefabricated prestressed concrete beam; the outwardly extending short beam and the prefabricated prestressed concrete beam are spliced ​​by the steel tenon and the tooth groove, and the end flanges are fixedly connected by bolts; the prestressed bars are arranged correspondingly inside the outwardly extending short beam and the prefabricated prestressed concrete beam.

2. A connection node between a prestressed concrete beam and a steel-concrete column according to claim 1, characterized in that: The steel tenon and the tooth groove are bonded by using construction adhesive.

3. The connection node between a prestressed concrete beam and a steel-concrete column according to claim 1, characterized in that: Prestressed tendon tubes are arranged at positions corresponding to the prestressed tendons inside the prefabricated prestressed concrete beam and the outrigger short beam.

4. A connection node between a prestressed concrete beam and a steel-concrete column according to claim 3, characterized in that: The prestressed rib tube is a PVC corrugated tube.

5. The connection node between a prestressed concrete beam and a steel-concrete column according to claim 1, characterized in that: The embedded steel is an I-beam.

6. The connection node between a prestressed concrete beam and a steel-concrete column according to claim 1, characterized in that: The bolts are high-strength bolts.

7. The connection node between a prestressed concrete beam and a steel-concrete column according to claim 1, characterized in that: The flange is a rectangular structure.

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