CN105804255A - Assembling structure for prefabricated concrete beam and composite steel pipe concrete column, and construction method for assembling structure - Google Patents

Abstract

Prefabricated concrete beam and composite steel pipe concrete column assembly structure and construction method thereof. The composite steel pipe concrete column includes an inner steel pipe and an outer steel pipe; there is interlayer concrete between the inner steel pipe and the outer steel pipe; There are multiple bolt holes on the plate; the outer steel pipe includes the upper outer steel pipe and the lower outer steel pipe; holes are opened at the bottom of the upper outer steel pipe for the assembly of prefabricated concrete beams; prefabricated concrete beams include prefabricated reinforced concrete, pre-embedded beam end steel pipes The center of the pre-embedded beam-end steel pipe is provided with a beam-end connection plate, and the periphery of the pre-embedded beam-end steel pipe is provided with multiple longitudinal reinforcements; the beam-end connection plate is provided with multiple bolt holes; the periphery of the longitudinal reinforcement is provided with stirrups; The beam end is bent vertically and anchored in the interlayer concrete; the inner pipe connecting plate and the beam end connecting plate are locked and connected by multiple bolts. The invention has high bearing capacity, high rigidity and good shock resistance and ductility.

Description

Prefabricated Concrete Beam and Composite Steel Tube Concrete Column Assembly Structure and Its Construction Method

【Technical field】

The invention belongs to the technical field of prefabricated assembled structures in civil engineering, and in particular relates to an assembled structure of prefabricated concrete beams and composite steel pipe concrete columns and a construction method thereof.

【Background technique】

The traditional cast-in-place construction method has a low degree of industrialization, poor construction conditions, time-consuming and labor-intensive, is not conducive to energy conservation and environmental protection, common quality problems are difficult to eradicate, and safety accidents also occur from time to time. The use of prefabricated structures can save energy, water, and materials, greatly reduce construction waste, reduce noise pollution, reduce labor consumption and intensity, effectively improve the construction environment, and improve project quality.

Most of the joints of traditional reinforced concrete beams and concrete-filled steel tube columns are connected by steel bars around. On-site formwork needs to be installed, and steel bars are bound and connected. The process is complicated and the construction is difficult; the section size of the joint connection is relatively large. In the assembly of steel pipe concrete column connection joints, it is mainly connected with steel beams. The joints use end plates and bolts to connect with the external steel pipes of the columns. Difference. At present, there is still a lack of connection structure between precast concrete beams and concrete-filled steel tube columns in the project, and the connection between precast concrete beams and composite steel tube concrete columns is even more lacking.

【Content of invention】

One of the technical problems to be solved by the present invention is to provide an assembly structure of prefabricated concrete beams and composite steel tube concrete columns with high bearing capacity, high rigidity and good seismic ductility.

The second technical problem to be solved by the present invention is to provide a construction method for the assembly structure of prefabricated concrete beams and composite steel tube concrete columns with high bearing capacity, high rigidity and good seismic ductility.

One of the technical problems to be solved in the present invention is achieved in this way:

An assembly structure of a prefabricated concrete beam and a composite steel pipe concrete column, the composite steel pipe concrete column includes an inner steel pipe and an outer steel pipe; there is interlayer concrete between the inner steel pipe and the outer steel pipe; an inner pipe is arranged on the inner steel pipe A connection plate, the inner pipe connection plate is provided with a plurality of bolt holes; the outer steel pipe includes an upper outer steel pipe and a lower outer steel pipe; holes are opened at the bottom of the upper outer steel pipe for the assembly of the precast concrete beam;

The prefabricated concrete beams include prefabricated reinforced concrete and pre-embedded beam end steel pipes; beam end connecting plates are arranged at the center of the pre-embedded beam end steel pipes, and a plurality of longitudinal steel bars are arranged around the pre-embedded beam end steel pipes; the beam end A plurality of bolt holes are provided on the connecting plate; stirrups are provided on the periphery of the longitudinal reinforcement; the longitudinal reinforcement is vertically bent at the beam end and anchored in the interlayer concrete;

The inner pipe connecting plate and the beam end connecting plate are locked and connected by a plurality of bolts.

Further, the inner steel pipe has an inner layer of concrete.

Further, both the inner steel pipe and the outer steel pipe are square steel pipes, and the sides of the inner steel pipe form an angle of 45 degrees with the sides of the outer steel pipe; the inner pipe connecting plate is arranged at the corner of the inner steel pipe .

Further, both the outer steel pipe and the beam end steel pipe are made of carbon steel, stainless steel, or fire-resistant steel.

Two of the technical problem to be solved in the present invention is achieved in this way:

A construction method for the assembly structure of prefabricated concrete beams and composite steel pipe concrete columns, comprising the following steps:

Step 1: First, pre-process the inner steel pipe, the upper outer steel pipe and the lower outer steel pipe of the outer steel pipe in the processing plant, set the bolt holes at the design position for the inner pipe connecting plate and the beam end connecting plate, and weld the inner pipe connecting plate at the designed height The corners of the inner steel pipe, the beam end connecting plate and the beam end steel pipe are pre-embedded at the end of the prefabricated reinforced concrete;

Step 2: Install the inner steel pipe and the lower outer steel pipe at the design position, lift the precast concrete beam, and place the beam end steel pipe on the lower outer steel pipe;

Step 3: Align the bolt holes of the beam end connecting plate and the inner pipe connecting plate, and connect with bolts;

Step 4: Place the upper outer steel pipe, and then weld the beam end steel pipe, the upper outer steel pipe, and the lower outer steel pipe;

Step 5: Fill the interlayer concrete between the inner steel pipe and the outer steel pipe, and fill it up to the steel pipe at the beam end.

Further, in the step 5, it also includes: filling the inner layer of concrete inside the inner steel pipe to form a solid structure.

The advantage of the present invention is that: the assembly structure of the prefabricated concrete beam and the composite steel pipe concrete column of the present invention truly realizes the anti-seismic design concept of strong columns and weak beams, strong joints and weak components. High bearing capacity, high rigidity, good seismic ductility, superior integrity, convenient construction and good construction quality, provide effective restraint for concrete, and move the plastic hinge at the end of the beam outward.

【Description of drawings】

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is a three-dimensional schematic diagram of the assembly structure of prefabricated concrete beams and composite steel pipe concrete columns of the present invention.

Fig. 2 is a sectional view of the assembly structure of the prefabricated concrete beam and the composite steel pipe concrete column of the present invention.

Fig. 3 is a three-dimensional schematic diagram of a composite steel pipe concrete column of the present invention (the upper outer steel pipe is removed).

Fig. 4 is a perspective view of the upper outer steel pipe of the present invention.

Fig. 5 is a perspective view of the prefabricated concrete beam of the present invention.

Fig. 6 is a perspective view of the internal structure of the prefabricated concrete beam (the steel pipe at the beam end is removed) of the present invention.

Fig. 7 is a schematic diagram of the connection between the prefabricated concrete beam and the composite steel pipe column of the present invention (the upper outer steel pipe is removed).

Labels in the figure:

1—inner steel pipe; 2—outer steel pipe; 21—upper outer steel pipe; 22—lower outer steel pipe; 3—beam end steel pipe; 4—prefabricated reinforced concrete; 5—inner pipe connecting plate; 6—beam end connecting plate; 7— Longitudinal reinforcement; 8—stirrup; 9—interlayer concrete; 10—inner concrete; 11—bolt hole; 12—bolt; 100—composite steel tube concrete column; 300—precast concrete beam.

【detailed description】

As shown in Figures 1 to 7, an assembly structure of a prefabricated concrete beam and a composite steel pipe concrete column, the composite steel pipe concrete column 100 includes an inner steel pipe 1 and an outer steel pipe 2; the inner steel pipe 1 and the outer steel pipe 2 There is interlayer concrete 9 between them, and the inside of the inner steel pipe 1 is inner layer concrete 10; the prefabricated concrete beam 300 includes prefabricated reinforced concrete 4, pre-embedded beam end steel pipe 3; the center of the pre-embedded beam end steel pipe 3 is provided with a beam end connection plate 6, a plurality of longitudinal steel bars 7 are arranged around the pre-embedded beam-end steel pipe 3; a plurality of bolt holes 11 are arranged on the beam-end connecting plate 6; stirrups 8 are arranged around the periphery of the longitudinal steel bars 7; The longitudinal steel bar 7 is vertically bent at the beam end and anchored in the sandwich concrete 10 .

The inner steel pipe 1 and the outer steel pipe 2 are square steel pipes, and the sides of the inner steel pipe 1 and the outer steel pipe 2 form an angle of 45 degrees; the corners of the inner steel pipe 1 are provided with an inner pipe connecting plate 5 , the inner pipe connecting plate 5 is provided with a plurality of bolt holes 11; the outer steel pipe 2 includes an upper outer steel pipe 21 and a lower outer steel pipe 22; the bottom of the upper outer steel pipe 21 is provided with a hole for the precast concrete Assembly of beam 300 .

During assembly, the inner pipe connecting plate 5 and the beam end connecting plate 6 are locked and connected by a plurality of bolts 12 .

Both the outer steel pipe 2 and the beam end steel pipe 3 are made of carbon steel, stainless steel or fire-resistant steel.

As shown in FIGS. 1 and 2 , an assembly structure of prefabricated concrete beams and composite steel pipe concrete columns, the assembly structure is composed of composite steel pipe concrete columns 100 and prefabricated concrete beams 300 . The composite steel pipe concrete column 100 includes inner steel pipe 1, outer steel pipe 2, interlayer concrete 9 and inner layer concrete 10;

As shown in FIG. 3 , the inner steel pipe 1 is a steel pipe with a square section, and the inner steel pipe 1 forms a 45-degree angle with the outer steel pipe 2 sides, and forms a 45-degree angle with the precast concrete beam 300 along the length direction. The corner of the inner steel pipe 1 is provided with an inner pipe connection plate 5 at the node height, and the inner pipe connection plate 5 is provided with a bolt hole 11 . The outer steel pipe 2 adopts a square-section steel pipe, and the outer steel pipe 2 is composed of an upper outer steel pipe 21 and a lower outer steel pipe 22. The bottom of the upper outer steel pipe 21 has holes consistent with the size of the beam end steel pipe 3. As shown in Figure 4, the lower outer steel pipe 22 The top is flush with the outermost bottom surface of the steel pipe 3 at the beam end.

As shown in Figures 5 and 6, the prefabricated reinforced concrete 4 is equipped with longitudinal steel bars 7 and stirrups 8, and the longitudinal steel bars 7 are vertically bent at the beam end and anchored in the column interlayer concrete 9. The beam end connecting plate 6 is provided with bolt holes 11, which are pre-embedded in the prefabricated reinforced concrete 4, and connected with the inner pipe connecting plate 5 by bolts 12. The steel pipe 3 at the beam end has a rectangular cross-section, which is pre-buried at the end of the precast concrete beam 300 , and is welded to the outer steel pipe 2 of the composite steel pipe concrete column 100 .

As shown in Figure 7, after all the steel pipes and prefabricated concrete beams 300 are connected, the column concrete is poured, the interlayer concrete 9 is filled between the inner steel pipe 1 and the outer steel pipe 2, and the inner concrete 10 is filled inside the inner steel pipe 1, thereby forming a solid structure, the poured interlayer concrete 9 will fill up the steel pipe 3 at the beam end. The inner layer concrete 10 may not be filled into the inner steel pipe 1 to form a hollow structure.

In the present invention, the outer steel pipe 2 and the beam end steel pipe 3 can be made of carbon steel, stainless steel or fire-resistant steel.

In the present invention, the interlayer concrete 9 and the inner layer concrete 10 can be ordinary concrete, high-strength concrete, high-performance concrete, recycled aggregate concrete or lightweight aggregate concrete.

The construction method of prefabricated concrete beam and composite steel pipe concrete column assembly structure of the present invention is carried out according to the following steps:

Step 1. First, the upper outer steel pipe 21 and the lower outer steel pipe 22 of the inner steel pipe 1 and the outer steel pipe 2 are pre-processed in the processing plant. The inner pipe connecting plate 5 and the beam end connecting plate 6 are provided with bolt holes 11 at the design positions, and the inner pipe The connecting plate 5 is welded to the corner of the inner steel pipe 1 according to the designed height, and the connecting plate 6 at the beam end and the steel pipe 3 at the beam end are pre-embedded in the end of the prefabricated reinforced concrete 4 .

Step 2. Install the inner steel pipe 1 and the lower outer steel pipe 22 at the designed position, lift the precast concrete beam 300 , and place the steel pipe 3 at the beam end on the lower outer steel pipe 22 .

Step 3. Align the bolt holes 11 of the beam end connecting plate 6 and the inner pipe connecting plate 5, and connect them with bolts 12.

Step 4. Place the upper outer steel pipe 21, and weld the beam end steel pipe 3, the upper outer steel pipe 21, and the lower outer steel pipe 22.

Step 5: Fill the interlayer concrete 9 between the inner steel pipe 1 and the outer steel pipe 2, fill the beam end steel pipe 3, fill the inner layer concrete 10 inside the inner steel pipe 1, thereby forming a solid structure, or not fill the inner layer concrete 10, thus forming a hollow structure.

A prefabricated concrete beam of the present invention is connected to a composite steel pipe concrete column. One side of the inner steel pipe forms a 45-degree angle with two sides of the outer steel pipe, that is, one side of the inner steel pipe forms an angle of 45 degrees with the length direction of the prefabricated concrete beam 300, and the inner pipe connecting plate 5 Located at the corner of the inner steel pipe 1, connected with the beam end connecting plate 6, the bending stiffness of the joint is greatly improved, and it is convenient to pour the interlayer concrete 9; the inner steel pipe 1 of the column is penetrated at the joint, ensuring the bearing capacity and integrity of the column; The beam-end steel pipe 3 is pre-embedded at the end of the precast concrete beam 300, and the concrete at the beam end is effectively restrained by the beam-end steel pipe 3, so that the plastic hinge at the beam end moves outward, which improves the ductility and energy dissipation capacity of the joint; there is no need to bind steel bars on site , Bolts 12 are used in the prefabricated connection, and there is no need to add formwork, so the construction is convenient and quick; the setting of the inner pipe connecting plate 5, the beam end connecting plate 6, and the bolt 12 strengthens the bonding between the interlayer concrete 9 and the inner steel pipe 1, and the integrity is good ; The beam longitudinal reinforcement 7 is bent at the end and anchored in the interlayer concrete 9, so the connection integrity and seismic performance are good. The prefabricated concrete beam-composite steel pipe concrete column connection of the present invention truly realizes the anti-seismic design concept of strong columns and weak beams, strong joints and weak components.

The above descriptions are only preferred implementation examples of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. the assembling structure of precast concrete beam and composite steel tube concrete column, it is characterised in that:

Described composite steel tube concrete column includes interior steel pipe, outer steel pipe；Between described interior steel pipe and described outer steel pipe, there is sandwich concrete；Arranging interior pipe connecting plate on described interior steel pipe, this interior pipe connecting plate is provided with multiple bolt hole；Described outer steel pipe includes outside top steel pipe outside steel pipe and bottom；Outside described top, the bottom of steel pipe offers hole, for the assembling of described precast concrete beam；

Described precast concrete beam includes prefabricated reinforced concrete, pre-buried beam-ends steel pipe；The centrally disposed beam-ends connecting plate of described pre-buried beam-ends steel pipe, the periphery of described pre-buried beam-ends steel pipe arranges multiple longitudinal reinforcement；Described beam-ends connecting plate is provided with multiple bolt hole；The periphery of described longitudinal reinforcement arranges stirrup；Described longitudinal reinforcement vertically bends up at beam-ends, is anchored in described sandwich concrete；

Said inner tube connecting plate and described beam-ends connecting plate are locked and connected by multiple bolts.

2. the assembling structure of precast concrete beam as claimed in claim 1 and composite steel tube concrete column, it is characterised in that: in described interior steel pipe, there is interior layer concrete.

3. the assembling structure of precast concrete beam as claimed in claim 1 and composite steel tube concrete column, it is characterised in that: described interior steel pipe and described outer steel pipe are the limit of rectangular steel tube, the limit of described interior steel pipe and described outer steel pipe and form 45 degree of angles；Said inner tube connecting plate is arranged at the corner of described interior steel pipe.

4. the assembling structure of precast concrete beam as claimed in claim 1 and composite steel tube concrete column, it is characterised in that: described outer steel pipe and described beam-ends steel pipe all adopt carbon steel, rustless steel or refractory steel.

5. the implementation of the assembling structure of precast concrete beam as claimed in claim 1 and composite steel tube concrete column, it is characterised in that: comprise the steps:

Step 1: first the pre-processed interior steel pipe of processing factory, outer steel pipe top outside steel pipe outside steel pipe and bottom, interior pipe connecting plate and beam-ends connecting plate arrange bolt hole at design attitude, interior pipe connecting plate is welded on the corner of interior steel pipe by design height, and beam-ends connecting plate and beam-ends steel pipe are embedded in the end of prefabricated reinforced concrete；

Step 2: outside the interior steel pipe of installation and bottom, steel pipe is in design attitude, beam-ends steel pipe is shelved on outside bottom on steel pipe by precast concrete beam of slinging；

Step 3: the bolt hole of beam-ends connecting plate and interior pipe connecting plate is directed at, and is connected with；

Step 4: place steel pipe outside top, then by steel-pipe welding outside steel pipe, bottom outside beam-ends steel pipe, top；

Step 5: fill sandwich concrete between interior steel pipe and outer steel pipe, and be filled up in beam-ends steel pipe.

6. the implementation of the assembling structure of a kind of precast concrete beam as claimed in claim 5 and composite steel tube concrete column, it is characterised in that:

In described step 5, also include: in filling, layer concrete is in interior steel duct, thus forming solid construction.