CN110396916A - Joint structure and construction technology of U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled concrete-filled steel tube pier - Google Patents

Abstract

The invention discloses a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled steel pipe concrete pier joint structure and construction technology, including a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled steel pipe concrete pier. When the concrete-filled steel pipe pier is connected to the U-shaped thin-walled steel-prestressed concrete composite cap beam, connectors, ear plates, telescopic threaded steel pipes, platform beams and telescopic steel cables are arranged on the thin-walled concrete-filled steel pipe pier to ensure installation The stability of the process is to pour concrete into the processed U-shaped thin-walled steel beams to form the U-shaped thin-walled steel-prestressed concrete composite cover beams. After the concrete solidifies to reach the design strength, the prestressed steel bars embedded in it are stretched to form a combination beam. The U-shaped thin-walled steel-prestressed concrete composite beam of the present invention is reliable in connection with the steel tube concrete column, convenient in installation, simple in construction, good in earthquake resistance and fire resistance, and low in cost.

Description

U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled steel pipe concrete pier column joint Point structure and construction technology

technical field

The invention relates to the construction field, in particular to the joint structure and construction technology of a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled steel pipe concrete pier column.

Background technique

The cap beam is the beam set on the top of the bridge bent pile pier, also known as the cap beam. Its main function is to support the upper structure of the bridge and transfer all the load to the lower structure. In the current bridge engineering construction, due to the limitation of bridge height, geological and terrain conditions, the lower part of some bridges adopts the structural form of single-column piers and prestressed cap beams. Generally, by setting support points on the pier columns, I-beam or Bailey racks act as cap beam support brackets. Among the existing T-shaped single-column pier beams, pier beams and structural beams mainly bearing shear force, there are common disadvantages such as large cross-section of components, many reinforcements, poor ductility, and insufficient seismic performance.

Therefore, it is urgent to develop a joint structure and construction technology with reliable structural connection and fast and convenient construction.

Contents of the invention

The purpose of the present invention is to provide a joint structure and construction technology with reliable structural connection and fast and convenient construction.

The technical scheme adopted in order to realize the object of the present invention is such that the U-shaped thin-walled steel-prestressed concrete composite cover beam and the thin-walled concrete-filled steel tube pier joint structure include the U-shaped thin-walled steel-prestressed concrete composite cover beam and the thin-walled steel tube concrete pier column.

The upper end of the thin-walled steel pipe concrete pier is connected to the lower surface of the mid-span of the U-shaped thin-walled steel-prestressed concrete composite cover beam.

The U-shaped thin-walled steel-prestressed concrete composite cover beam includes U-shaped thin-walled steel plates and several prestressed tendons.

The cross section of the U-shaped thin-walled steel plate is U-shaped, with an opening at the upper end and a closed bottom at the lower end.

Below the opening is the inner cavity of the U-shaped thin-walled steel plate.

The transverse length direction of the inner cavity is the longitudinal direction of the U-shaped thin-walled steel plate, and the longitudinal length direction of the inner cavity is the transverse direction of the U-shaped thin-walled steel plate.

The part of the U-shaped thin-walled steel plate located on both sides of the inner cavity is designated as side plate I. The part of the U-shaped thin-walled steel plate located below the inner cavity is designated as the bottom plate I.

Both longitudinal ends of the U-shaped thin-walled steel plate are welded with sealing plates.

Several of said prestressing tendons are located in the inner cavity. After each prestressed tendon is stretched to form prestress, both ends of it are anchored on the sealing plate.

The inner space of the U-shaped thin-walled steel plate is poured and filled with concrete.

Further, several pegs are welded on the inner surface of the bottom plate.

Further, several cover plates are welded to the open end of the U-shaped thin-walled steel plate.

Furthermore, the U-shaped thin-walled steel plate is processed by cold-bending, splicing or welding.

Further, the prestressed tendons are adhesive prestressed steel wires, adhesive steel strands, adhesive prestressed threaded steel bars, non-adhesive prestressed steel wires, and non-adhesive prestressed steel wires. Steel strands or unbonded prestressed rebar.

Based on the above-mentioned U-shaped thin-walled steel-prestressed concrete composite cap beam and thin-walled concrete-filled steel pipe pier joint construction technology, the following steps are included:

1) Cold-bending, splicing or welding the thin-walled steel plates to make the U-shaped thin-walled steel plates. Wherein, the U-shaped thin-walled steel plate includes a bottom plate I and two side plates I. A number of through holes are processed at the mid-span position of the bottom plate I.

2) Several prestressed tendons pass through the inner cavity of the U-shaped thin-walled steel plate, so that both ends of each prestressed tendon protrude from the U-shaped thin-walled steel plate.

3) One end of some prestressed tendons stretching out from the U-shaped thin-walled steel plate passes through some through holes of a sealing plate, and the other end of some of the prestressed tendons stretching out from the U-shaped thin-walled steel plate passes through the hole of another sealing plate Several through holes are provided, and the two sealing plates are connected to the two end faces of the U-shaped thin-walled steel plates.

4) Install the thin-walled concrete-filled steel pipe pier at the designed position, and pre-embed several connectors on the top of the thin-walled concrete-filled steel pipe pier.

5) Connect two lugs to the side wall of the middle section of the thin-walled concrete-filled steel pipe pier to ensure that the line connecting the two lugs intersects the axis of the thin-walled concrete-filled steel pipe pier. The two ear plates are connected with a stretchable threaded steel pipe, and the upper end of each stretchable threaded steel pipe is connected with the platform beam. Wherein, the upper surfaces of the two platform beams and the upper end surfaces of the thin-walled concrete-filled steel tube pier columns are on the same horizontal plane, and a plurality of stretchable steel cables are connected between the two platform beams.

6) Install the U-shaped thin-walled steel plate processed in steps 1) to 3), the combination of several prestressed tendons and two sealing plates on the upper end of the thin-walled concrete-filled steel tube pier, so that several of the The connectors are inserted into several through holes of the bottom plate I and extend into the U-shaped thin-walled steel plate, and the longitudinal ends of the bottom plate I are respectively installed on the upper surfaces of the two platform beams.

7) Tensing one or both ends of the prestressed tendons. And tension anchors are clamped at both ends of each prestressed tendon, so that each tension anchor is anchored on the sealing plate.

8) Pouring and filling concrete into the U-shaped thin-walled steel beam.

9) After the concrete reaches the design strength, remove the lug plate, telescopic threaded steel pipe, platform beam and telescopic steel cable.

The beneficial effects of the present invention are:

1. The U-shaped thin-walled steel-prestressed concrete composite cover beam adopts strengthening measures in the joint area, welding local stiffeners and locally encrypted studs in the thin-walled steel beam to ensure reliable force transmission and has no effect on the appearance. Construction lap holes are reserved;

2. Pre-embed the reinforcement lapped to the U-shaped thin-walled steel-prestressed concrete composite cover beam in the node area of the thin-walled steel pipe concrete pier, then go deep into the composite beam, and then pour concrete to make the U-shaped thin-walled steel-prestressed concrete composite The integrity of the joint between the cover beam and the thin-walled concrete filled steel pipe pier column is stronger, and the beam and column are integrated in the joint area;

3. Design a combined tool with an auxiliary construction platform to provide temporary construction support to ensure the stability and construction accuracy of the fixed node area during the construction process.

Description of drawings

Fig. 1 is a part diagram of U-shaped thin-walled steel-prestressed concrete composite beam;

Fig. 2 is the construction technique drawing of U-shaped thin-walled steel-prestressed concrete composite beam;

Fig. 3 is a U-shaped thin-walled steel-prestressed concrete composite beam bottom view;

Fig. 4 is a side view of a U-shaped thin-walled steel-prestressed concrete composite beam;

Fig. 5 is the top view of U-shaped thin-walled steel-prestressed concrete composite beam;

Fig. 6 is a U-shaped thin-walled steel-prestressed concrete composite beam longitudinal section;

Fig. 7 is A-A sectional view;

Fig. 8 is B-B sectional view;

Fig. 9 is a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled concrete-filled steel pipe pier joint structure construction process diagram;

Fig. 10 is a schematic diagram of the U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled steel pipe concrete pier joint structure.

In the figure: U-shaped thin-walled steel plate 1, bottom plate I101, stud 1011, side plate I102, curling edge 1021, prestressed tendon 3, tension anchor 301, sealing plate 4, cover plate 5, concrete 6, thin-walled steel pipe Concrete piers 7, connectors 701, lugs 702, stretchable threaded steel pipes 703, platform beams 704 and stretchable steel cables 705.

Detailed ways

The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

Example 1:

This embodiment discloses a joint structure of a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled concrete-filled steel pipe pier column, including a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled steel pipe concrete pier column 7 .

Referring to Fig. 9 or 10, the upper end of the thin-walled concrete filled steel pipe pier column 7 is connected to the lower surface of the mid-span of the U-shaped thin-walled steel-prestressed concrete composite cover beam.

The U-shaped thin-walled steel-prestressed concrete composite cover beam includes U-shaped thin-walled steel plates 1 and several prestressed tendons 3 .

The U-shaped thin-walled steel plate 1 is processed by welding the thin-walled steel plate, and the processing process ensures equal strength welding. The model of the thin-walled steel plate is Q235. Referring to Fig. 1 or 2, the U-shaped thin-walled steel plate 1 is a constant-section steel beam.

Referring to FIG. 1 , the cross section of the U-shaped thin-walled steel plate 1 is U-shaped, with an opening at the upper end and a closed bottom at the lower end.

Below the opening is the inner cavity of the U-shaped thin-walled steel plate 1 .

The transverse length direction of the inner cavity is the longitudinal direction of the U-shaped thin-walled steel plate 1 , and the longitudinal length direction of the inner cavity is the transverse direction of the U-shaped thin-walled steel plate 1 .

The part of the U-shaped thin-walled steel plate 1 located on both sides of the inner cavity is marked as side plate I102, and the part of the U-shaped thin-walled steel plate 1 located below the inner cavity is marked as bottom plate I101.

A number of studs 1011 are welded on the inner side of the bottom plate I101.

Referring to Fig. 3, 4, 5 or 6, the longitudinal ends of the U-shaped thin-walled steel plate 1 are welded with sealing plates 4, and each of the sealing plates 4 is provided with several through holes.

Referring to Fig. 2, 6, 7 or 8, several prestressed ribs 3 pass through several through holes on the sealing plate 4. Several prestressed tendons 3 are close to the opening end of the U-shaped thin-walled steel plate 1 .

In this embodiment, the prestressed tendons 3 are non-adhesive steel strands. Several prestressed tendons 3 are arranged in a straight line.

Referring to FIG. 3 , tension anchors 301 are clamped at both ends of each prestressed tendon 3 , and several tension anchors 301 are anchored on the sealing plate 4 .

The open end of described U-shaped thin-walled steel plate 1 is welded with some cover plates 5, and the cross-section of described cover plate 5 is U-shaped, and the open end of some described cover plates 5 is connected with the open end of U-shaped thin-walled steel plate 1. relatively.

The cover plate 5 includes a bottom plate II and two side plates II, and the two side plates II are respectively welded to the outer sides of the two side plates I102.

Referring to Fig. 2, the inside of the U-shaped thin-walled steel plate 1 is poured and filled with concrete 6, and the concrete 6 is ordinary concrete that can meet the strength conditions of prestressed concrete. Thus, the U-shaped thin-walled steel plate 1, several prestressed tendons 3 and concrete 6 form a U-shaped thin-walled steel-prestressed concrete composite beam.

When in use, the U-shaped thin-walled steel-prestressed concrete composite beam is arranged with the opening end of the prestressed tendon as the tension area of the beam.

Example 2:

This embodiment discloses a joint structure of a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled concrete-filled steel pipe pier column, including a U-shaped thin-walled steel-prestressed concrete composite cover beam and a thin-walled steel pipe concrete pier column 7 .

Referring to Fig. 9 or 10, the upper end of the thin-walled concrete filled steel pipe pier column 7 is connected to the lower surface of the mid-span of the U-shaped thin-walled steel-prestressed concrete composite cover beam.

The U-shaped thin-walled steel-prestressed concrete composite cover beam includes U-shaped thin-walled steel plates 1 and several prestressed tendons 3 .

Referring to FIG. 1 , the cross section of the U-shaped thin-walled steel plate 1 is U-shaped, with an opening at the upper end and a closed bottom at the lower end.

Below the opening is the inner cavity of the U-shaped thin-walled steel plate 1 .

The transverse length direction of the inner cavity is the longitudinal direction of the U-shaped thin-walled steel plate 1 , and the longitudinal length direction of the inner cavity is the transverse direction of the U-shaped thin-walled steel plate 1 .

Referring to FIG. 1 or 2 , the parts of the U-shaped thin-walled steel plate 1 located on both sides of the inner cavity are marked as side plates I 102 . The part of the U-shaped thin-walled steel plate 1 located below the inner cavity is designated as the bottom plate I101.

Referring to Fig. 3, 4, 5 or 6, the longitudinal ends of the U-shaped thin-walled steel plate 1 are welded with sealing plates 4.

Several prestressed tendons 3 are located in the inner cavity. After each prestressed tendon 3 is stretched to form a prestressed force, both ends thereof are anchored on the sealing plate 4 .

The inner space of the U-shaped thin-walled steel plate 1 is poured and filled with concrete 6 . The concrete 6 is ordinary concrete, and the ordinary concrete meets the strength requirements of tensioned concrete.

Example 3:

The main structure of this embodiment is the same as that of Embodiment 2. Further, referring to FIG. 1 , 6 , 7 or 8 , several pegs 1011 are welded on the upper surface of the bottom plate 101 .

Example 4:

The main structure of this embodiment is the same as that of Embodiment 3. Further, referring to Fig. 1, 6, 7 or 8, the open end of the U-shaped thin-walled steel plate 1 is welded with several cover plates 5. Referring to FIG. 1 or 7 , the cross-section of the cover plates 5 is U-shaped, and the opening ends of several cover plates 5 are opposite to the opening ends of the U-shaped thin-walled steel plates 1 .

The cover plate 5 includes a bottom plate II and two side plates II, and the two side plates II are respectively welded to the outer sides of the two side plates I102.

Example 5:

The main structure of this embodiment is the same as that of Embodiment 4. Further, referring to Fig. 1, 6, 7 or 8, the U-shaped thin-walled steel plate 1 is processed by welding a thin-walled steel plate, and the processing process ensures equal strength welding. The cross-sections at various positions of the shaped thin-walled steel plate 1 are the same.

Embodiment 6:

The main structure of this embodiment is the same as that of Embodiment 5, further, the prestressed tendons 3 are non-adhesive steel strands.

Embodiment 7:

This embodiment discloses the construction process based on the U-shaped thin-walled steel-prestressed concrete composite cap beam and thin-walled steel pipe concrete pier joint structure described in Embodiment 1, see Figure 2 or 9, including the following steps:

1) The thin-walled steel plate is welded to produce the U-shaped thin-walled steel plate 1 . Wherein, the U-shaped thin-walled steel plate 1 includes a bottom plate I101 and two side plates I102. A curling edge 1021 is processed on the opening end of each side plate I102, and an ear plate 702 is welded on the outer surface of each side plate I102, and the ear plate 702 is located at the mid-span position of the side plate I102. A number of through holes are processed at the mid-span position of the bottom plate I101, and several pegs 1011 are welded on the inner surface of the bottom plate I101.

2) Several prestressed tendons 3 pass through the inner cavity of the U-shaped thin-walled steel plate 1 , so that both ends of each prestressed tendon 3 protrude from the U-shaped thin-walled steel plate 1 . Wherein, several prestressed tendons 3 are close to the opening end of the U-shaped thin-walled steel plate 1 .

3) One end of several prestressed tendons 3 protruding from U-shaped thin-walled steel plate 1 passes through several through holes of a sealing plate 4, and the other end of several prestressed tendons 3 protruded from U-shaped thin-walled steel plate 1 passes through A plurality of through holes of another cover plate 4, and the two cover plates 4 are connected to the two end faces of the U-shaped thin-walled steel plate 1.

4) Weld several cover plates 5 on the opening end of the U-shaped thin-walled steel plate 1 . The two side plates II of each cover plate 5 are respectively welded to the outer surfaces of the two side plates I 102 .

5) Install the thin-walled concrete-filled steel pipe pier column 7 at the designed position, and pre-embed a number of connectors 701 at the top of the thin-walled steel pipe concrete pier column 7, and Two lugs 702 are connected to the wall, and the connecting line of the two lugs 702 intersects the axis of the thin-walled steel pipe concrete pier 7 .

6) Connect two lugs 702 on the side wall of the thin-walled concrete-filled steel pipe pier column 7 middle sections, ensuring that the connecting line of the two ear plates 702 intersects with the axis of the thin-walled concrete-filled steel pipe pier column 7. The two ear plates 702 are connected to a stretchable threaded steel pipe 703 , and the upper end of each stretchable threaded steel pipe 703 is connected to a platform beam 704 . Wherein, the upper surfaces of the two platform beams 704 and the upper end surfaces of the thin-walled concrete-filled steel tube pier columns 7 are on the same horizontal plane, and several stretchable steel cables 705 are connected between the two platform beams 704 .

7) Install the U-shaped thin-walled steel plate 1 processed in steps 1) to 4), the combination of several prestressed tendons 3 and two sealing plates 4 on the upper end of the thin-walled steel pipe concrete pier 7, A plurality of connecting pieces 701 are inserted into several through holes of the bottom plate I101 and then extended into the U-shaped thin-walled steel plate 1, and the longitudinal ends of the bottom plate I101 are installed on the upper surfaces of two platform beams 704 respectively. And the stiffeners are welded at the junction of the thin-walled steel pipe concrete piers 7 and the U-shaped thin-walled steel plates 1 . Connect the two lugs 702 on the side walls of the upper end of the thin-walled steel pipe concrete piers 7 to the lugs 702 on the side walls of the two flanges I102 respectively.

8) Tensioning one or both ends of the prestressed tendons 3; on the cover plate 4.

9) Pouring and filling the concrete 6 inside the U-shaped thin-walled steel beam 1 .

10) After the concrete 6 reaches the design strength, remove the lug plate 702, the stretchable threaded steel pipe 703, the platform beam 704 and the stretchable steel cable 705.

Claims (6)

1. U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled concrete-filled steel pipe pier joint structure, characterized in that: it includes the U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled steel pipe concrete pier (7); The upper end of the thin-walled steel pipe concrete pier (7) is connected to the lower surface of the span of the U-shaped thin-walled steel-prestressed concrete composite cover beam; The U-shaped thin-walled steel-prestressed concrete composite cover beam includes U-shaped thin-walled steel plates (1) and several prestressed tendons (3); The cross-section of the U-shaped thin-walled steel plate (1) is U-shaped, the upper end has an opening, and the lower end is a closed bottom surface; Below the opening is the inner cavity of the U-shaped thin-walled steel plate (1); The transverse length direction of the inner cavity is the longitudinal direction of the U-shaped thin-walled steel plate (1), and the longitudinal length direction of the inner cavity is the transverse direction of the U-shaped thin-walled steel plate (1); The part of the U-shaped thin-walled steel plate (1) located on both sides of the internal cavity is marked as side plate I (102); the part of the U-shaped thin-walled steel plate (1) located below the internal cavity is marked as bottom plate I ( 101); Both longitudinal ends of the U-shaped thin-walled steel plate (1) are welded with sealing plates (4); Several prestressed tendons (3) are located in the inner cavity; each prestressed tendon (3) is tensioned to form prestress, and its two ends are anchored on the sealing plate (4); The inner space of the U-shaped thin-walled steel plate (1) is poured and filled with concrete (6). 2. U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled concrete-filled steel pipe pier joint structure according to claim 1, is characterized in that: the inner surface of the bottom plate I (101) is welded with some studs ( 1011). 3. U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled steel pipe concrete pier joint structure according to claim 1, characterized in that: the open end of the U-shaped thin-walled steel plate (1) is welded with several cover (5). 4. The joint structure of U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled concrete-filled steel tube pier column according to claim 1, characterized in that: the U-shaped thin-walled steel plate (1) is made of thin-walled steel plate through cold bending , Splicing or welding processing. 5. The U-shaped thin-walled steel-prestressed concrete composite cover beam and thin-walled steel pipe concrete pier joint structure according to claim 1, characterized in that: the prestressed tendon (3) is an adhesive prestressed steel wire , Adhesive steel strands, adhesive prestressed rebars, non-adhesive prestressed steel wires, non-adhesive steel strands or non-adhesive prestressed rebars. 6. based on the construction technology of U-shaped thin-walled steel-prestressed concrete composite cap beam and thin-walled steel pipe concrete pier node structure according to claim 1, it is characterized in that: comprise the following steps: 1) Cold-bending, splicing or welding the thin-walled steel plates to make the U-shaped thin-walled steel plate (1); wherein, the U-shaped thin-walled steel plate (1) includes a bottom plate I (101) and two Side plate I (102); process a number of through holes at the mid-span position of the bottom plate I (101); 2) some of the prestressed tendons (3) pass through the inner cavity of the U-shaped thin-walled steel plate (1), so that the two ends of each of the prestressed tendons (3) extend out of the U-shaped thin-walled steel plate (1) ); 3) One end of several prestressed tendons (3) protruding from the U-shaped thin-walled steel plate (1) passes through several through holes of a sealing plate (4), and several prestressed tendons (3) protrude from the U-shaped thin-walled steel plate (1). The other end of the wall steel plate (1) passes through some through holes of another sealing plate (4), and the two sealing plates (4) are connected to the two end faces of the U-shaped thin-walled steel plate (1); 4) Install the thin-walled concrete-filled steel pipe pier (7) at the designed position, and pre-embed several connectors (701) at the top of the thin-walled concrete-filled steel pipe pier (7); 5) Connect two lugs (702) on the side wall of the middle section of the thin-walled concrete-filled steel pipe pier (7), ensuring that the connecting line of the two lugs (702) is connected with the thin-walled concrete-filled steel pipe pier ( 7) axes intersect; the two lugs (702) are connected to a telescopic threaded steel pipe (703), and the upper end of each telescopic threaded steel pipe (703) is connected to the platform beam (704); wherein , the upper surfaces of the two platform beams (704) and the upper end surfaces of the thin-walled concrete-filled steel tube pier columns (7) are on the same horizontal plane, and several stretchable steel cables ( 705); 6) Install the U-shaped thin-walled steel plate (1), several prestressed tendons (3) and two sealing plates (4) processed in steps 1) to 3) on the thin-walled steel pipe concrete The upper end of the pier column (7) is inserted into several through holes of the bottom plate I (101) and stretched into the U-shaped thin-walled steel plate (1), and the longitudinal two sides of the bottom plate I (101) The ends are respectively installed on the upper surfaces of the two platform beams (704); 7) Tensioning one or both ends of the prestressed tendons (3); The tension anchor (301) is anchored on the sealing plate (4); 8) pouring and filling concrete (6) inside the U-shaped thin-walled steel beam (1); 9) After the concrete (6) reaches the design strength, remove the lug plate (702), stretchable threaded steel pipe (703), platform beam (704) and stretchable steel cable (705).