CN105735112B - Bolt connection-based rapid assembling precast rectangular concrete filled steel tube bridge pier - Google Patents

Abstract

The invention discloses a fast-assembled prefabricated rectangular concrete-filled steel pipe pier based on bolt connection, which belongs to the field of bridge engineering and includes prefabricated rectangular concrete-filled steel pipe sections, embedded nodes, connecting plates, high-strength bolts and core-through bolts; the prefabricated steel pipe concrete sections are made of steel pipes Sections, concrete, reserved core-piercing bolt channels, reserved bolt holes, prefabricated nuts, sealing materials and PVC pipes; pre-embedded nodes are composed of prefabricated rectangular steel pipe concrete sections, foot plates, external stiffeners and anchor bolts; connections Bolt holes and core-through bolt holes are arranged according to the design bolt position in the plate; adjacent prefabricated steel pipe concrete segments are connected by connecting plates, high-strength bolts and core-through bolts. The invention has the characteristics of strong compressive and shear bearing capacity, superior seismic performance, easy factory production, convenient on-site construction, energy saving and environmental protection, and the like.

Description

Rapid assembly of prefabricated rectangular concrete filled steel pipe piers based on bolted connections

technical field

The invention belongs to the field of bridge engineering, and in particular relates to a prefabricated section-assembled steel pipe concrete bridge pier.

Background technique

One of the main challenges that the current urban bridge construction is facing is that in addition to the safety and durability of the bridge structure, the owners and residents also hope to minimize the disturbance to the surrounding traffic during the construction of the bridge structure and shorten the traffic jam time caused by the bridge construction. Reduce various noises generated by engineering transport vehicles and construction. These requirements have promoted the development of bridge engineering industrialization technology, among which prefabricated assembly technology is produced under this background, segmental prefabricated assembly technology provides a favorable solution for the construction of fast, efficient, safe and durable urban bridge engineering . In addition, in the long cross-strait bridge project, the constraints of limited offshore construction platform space, complex marine climate conditions, and strict environmental protection conditions have also promoted the use of segmental assembly construction technology in long cross-sea bridge projects. Applications.

There are relatively few studies and applications of prefabricated segmental assembly technology in my country. The prefabricated segmental assembly technology in existing projects is mainly applied to the upper structure of bridges. Erection or assembly of cantilever segments. The prefabricated segmental assembly technology of the bridge substructure is still in the preliminary research stage. Only some sea-crossing projects have adopted the prefabricated assembly technology of the whole pier prefabricated cast-in-place wet joint connection, and the urban bridge substructure has basically not adopted the prefabricated segmental assembly technology. my country is in the period of large-scale transportation infrastructure construction. In the construction process of urban bridges and sea-crossing bridges, the rapid construction technology of bridges has attracted more and more attention from construction owners and construction owners due to its advantages of high component processing quality, high construction efficiency, and environmental friendliness. . Bridge structure prefabrication and assembly technology will be an important development direction of bridge engineering construction in the future.

In recent years, concrete-filled steel tube columns have been widely used in building structures, especially for high-rise and super high-rise building structures with large load-bearing requirements, and concrete-filled steel tube columns are more widely used. Concrete-filled steel tube members make full use of the advantages of steel in tension and concrete in compression, not only have good pressure bearing capacity, but also have very good seismic performance under horizontal reciprocating action, so they are favored by engineering designers and builders. However, most of the CFST components currently used are also based on cast-in-place CFST components. Scholars at home and abroad have proposed a variety of connection forms for the joint structure of CFST columns and beams. But at present, the research and development and application of CFST in bridge piers are still very little.

Contents of the invention

The invention makes full use of the good vertical bearing capacity and anti-seismic performance of steel pipe concrete, combines it with prefabricated assembly technology, and at the same time avoids or delays the out-of-plane buckling of the end steel plate of steel pipe concrete, and provides a fast assembled prefabricated rectangle based on bolt connection Concrete-filled steel pipe piers meet the segmental prefabricated assembly structure of bridge key components in bridge industrial construction technology, and are easy to carry out mechanized construction of prefabricated and assembled piers, reducing the workload of on-site welding and prestressed tension.

Technical scheme of the present invention is as follows:

The invention relates to a fast-assembled prefabricated rectangular steel pipe concrete pier based on bolt connection, which belongs to the field of bridge engineering. It includes a prefabricated rectangular steel pipe concrete section (3), a pre-embedded node (6), and a cap (5). The pre-buried node (6) is arranged between the cap (5) and the prefabricated rectangular steel tube concrete section (3).

Between the adjacent prefabricated rectangular steel pipe concrete sections (3) and between the prefabricated rectangular steel pipe concrete sections (3) and the embedded nodes (6), the connecting plates (4) are arranged on the adjacent steel pipe sections (11 ), connect and fix the connecting plate (4) and steel pipe segment (11) through high-strength bolts (7) and core-piercing bolts;

The prefabricated rectangular steel pipe concrete section (3) is composed of steel pipe section (11), concrete (12), prefabricated nut (13), sealing material (14) and PVC pipe (15), and the steel pipe section (11) prefabricated A PVC pipe (15) is placed at the hole for the core-through bolt, and a prefabricated nut (13) is spot-welded at the reserved bolt hole, and the unwelded end of the prefabricated nut (13) is sealed with a sealing material (14), and the concrete (12) Pouring in the steel pipe segment (11); the embedded node (6) is composed of the steel pipe segment (11), concrete (12), prefabricated nut (13), sealing material (14), PVC pipe (15), foot plate ( 10), external stiffeners (9) and anchor bolts (2), foot plate (10), external stiffeners (9) and prefabricated nuts (13) are welded with steel pipe segments (11), anchor bolts (2) Fix it on the foot plate (10), place a PVC pipe at the reserved hole for the core-through bolt of the steel pipe section (11), pour concrete (12) in the steel pipe section (11); the connecting plate (4) is arranged according to the designed bolt position High-strength bolt holes and core bolt holes.

At the pre-embedded node (6), bolt holes and core passages are reserved at the exposed end; the embedded end is welded to the foot plate (10) and the external stiffener (9), and the foot plate (10) is connected to the anchor bolt (2). The depth of the pre-buried section embedded in the cap (5) is not less than 1.5 times the length of the short side of the rectangular steel pipe concrete, and the length of the exposed end is 1/2 of the length of the connecting plate (4). The pre-embedded joint (6) is mainly used for connecting the prefabricated assembled pier column and the cap (5), and the anchor bolt (2) is used to improve the pull-out resistance and shear resistance of the pre-embedded joint (6).

The design number of the high-strength bolts (7) and core-through bolts (8) is determined by the ratio of the design lateral bearing capacity of the bridge pier to the allowable anti-sliding bearing capacity of a single bolt. The core-piercing bolts (8) and high-strength bolts (7) adopt the principle of interlaced staggered arrangement, and the core-piercing bolts (8) on two adjacent sides are not at the same horizontal position, so as to prevent the core-piercing bolts (8) from being in the intersects within. The positions of the bolt holes and the core-through bolt holes on the connecting plate (4) correspond to the positions of the reserved bolt holes and the core-through bolt holes on the prefabricated rectangular steel tube concrete section (3).

The prefabricated nut (13) is spot-welded with the inner wall of the steel pipe at the reserved bolt hole of the prefabricated rectangular steel pipe concrete section (3), and the unwelded end is sealed with a sealing material (14) to prevent the concrete (12) from being poured The water overflows and the water vapor outside the pier column enters the inside of the prefabricated rectangular steel pipe concrete segment (3).

The connecting plate (4) and the steel pipe section (11) are tightly bonded to ensure that the high-strength bolts (7) and core-through bolts (8) are under pressure and under tension under the action of lateral force, so as to avoid being under shear. state.

The inner diameter of the PVC pipe (15) should be 1-2mm larger than the diameter of the core bolt (8), so that the installation of the core bolt facilitates the deformation of the PVC pipe (15) when pouring concrete and leaves a certain space.

The invention has the following advantages: Compared with cast-in-place piers, segmental prefabricated assembled steel pipe concrete piers have good compression resistance, shear bearing capacity and seismic performance, and can fully exert the material properties of steel tensile strength and concrete compression resistance. In the prefabricated segmental pier column, the steel pipe is directly used as the concrete pouring template in the prefabrication process, which saves the prefabrication cost and improves the production efficiency. The prefabricated segmental assembled piers are easy to install and construct, and do not require on-site tension prestressing, welding or grouting, reducing the amount of on-site installation work. It provides a quick and effective solution for the rapid construction of bridges in strong earthquake areas, and reduces the adverse social and economic impacts caused by bridge construction, such as traffic delays and environmental pollution. At the same time, it provides a feasible solution for repairing damaged bridges after earthquakes.

Description of drawings

Fig. 1 Structural diagram of prefabricated assembled rectangular concrete filled steel pipe piers.

Figure 2.1 Structural drawing of prefabricated rectangular concrete filled steel tube segment and its horizontal section.

Figure 2.2 is a cross-sectional view of the prefabricated rectangular concrete filled steel tube segment A-A.

Figure 3.1 is the construction diagram of embedded nodes.

Figure 3.2 Sectional view of embedded node B-B.

Fig. 4 Structural diagram of adjacent two sides of the connecting plate.

Figure 5. Flow chart of prefabricated assembled rectangular concrete filled steel pipe piers.

In the figure: 1—cover beam; 2—anchor bolt; 3—prefabricated rectangular steel pipe concrete segment; 4—connecting plate; —external stiffener; 10—foot plate; 11—steel pipe segment; 12—concrete; 13—prefabricated nut; 14—sealing material; 15—PVC pipe.

detailed description

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawings 2.1 to 4.

Step 1: Processing the prefabricated rectangular concrete-filled steel tube segment (3), connecting plate (4), and pre-embedded node (6), specifically including the following steps:

1) Prefabricated rectangular steel tube concrete segment (3), the prefabricated rectangular steel tube concrete segment (3) is manufactured in the factory, the plates are welded into rectangular steel tubes, and the welds should be groove penetration welds. The reserved bolt holes and core-through bolt holes are processed on the steel pipe, and the prefabricated nut (14) is aligned with the axis of the reserved bolt hole and fixed by spot welding. The end of the nut that is not spot-welded with the inner wall of the steel pipe is made of sealing material (14) For sealing, set PVC pipe (15) at the position of the core bolt hole, pass the core bolt (8) through the PVC pipe (15) and tighten it for temporary fixation, pour concrete (12) and vibrate for maintenance, and the core bolt (8) ) can prevent the movement of the PVC pipe (15) and the deformation of the steel pipe segment (11) during the concrete pouring and curing process.

2) Make the connecting plate (4), make the connecting plate (4) in the factory, select and cut the plate according to the thickness size, process and reserve high-strength bolt holes and core-through bolt holes at the corresponding positions of the plate.

3) Make the pre-buried joints (6), make the pre-buried joints (6) in the factory, weld the foot plate (10) and the external stiffener (9) at the end of the prefabricated steel pipe concrete segment without bolt holes, and the foot plate (10 ) process the bolt holes to connect the anchor bolts (2).

4) Construction of the foundation cap (5) and the cover beam (1), pouring the foundation cap (5) and the cover beam (1) on site, and embedding two pre-buried nodes (6) into the foundation cap (5 ) and cover beam (1) for pouring.

Step 2: Assembly of the prefabricated segmental pier construction site, as shown in Figure 5, specifically includes the following steps:

1) Install the foundation cap (5) of the embedded node (6) to the designed position and fix it. Remove the temporarily fixed core bolts (8) on the embedded nodes (6) and the prefabricated rectangular steel tube concrete segments (3) during factory prefabrication.

2) Align the reserved bolt holes at the lower end of the connecting plate (4) with the reserved bolt holes at the top of the embedded node (6), and install high-strength bolts ( 7) and core-through bolts (8), fixing two adjacent connecting plates (4) to position and limit the adjacent prefabricated rectangular steel tube concrete segment (3) above the pre-embedded node (6) .

3) Lift the prefabricated rectangular concrete-filled steel tube segment (3) to the corresponding design position with a hoist, install the remaining two connecting plates (4), and tighten the high-strength bolts (7) and core-through bolts ( 8).

4) Repeat step 2) and step 3) to install the connecting plate (4) of the next node and the installation of the prefabricated rectangular steel tube concrete segment (3), until all the prefabricated rectangular steel tube concrete segments (3) are installed.

5) Finally, repeat step 2), install the joint connection plate (4) of the prefabricated cover beam (1) and its adjacent prefabricated rectangular steel tube concrete segment (3), tighten the high-strength bolts (7) corresponding to the reserved bolt holes and wear through Core bolts (8).

For the reserved bolt holes described in step 1) in step 1, the corresponding steel pipe segment (11) and connecting plate (4) should be fixed according to the position after installation and forming, and then drilled uniformly to ensure the reserved bolt holes inside and outside Fully aligned, and after drilling, it is necessary to grind the burrs on the inner and outer sides of the reserved bolt holes to avoid jamming caused by burrs during the installation project.

Claims (5)

1. Prefabricated prefabricated rectangular steel pipe concrete piers based on bolt connection, characterized in that: the bridge pier includes prefabricated rectangular steel pipe concrete segments (3), pre-embedded nodes (6), caps (5); pre-embedded nodes (6) It is arranged between the cap (5) and the prefabricated rectangular steel tube concrete segment (3); Between the adjacent prefabricated rectangular steel pipe concrete sections (3) and between the prefabricated rectangular steel pipe concrete sections (3) and the embedded nodes (6), the connecting plates (4) are arranged on the adjacent steel pipe sections (11 ), connect and fix the connecting plate (4) and steel pipe segment (11) through high-strength bolts (7) and core-piercing bolts; The prefabricated rectangular steel pipe concrete section (3) is composed of steel pipe section (11), concrete (12), prefabricated nut (13), sealing material (14) and PVC pipe (15), and the steel pipe section (11) prefabricated A PVC pipe (15) is placed at the hole for the core-through bolt, and a prefabricated nut (13) is spot-welded at the reserved bolt hole, and the unwelded end of the prefabricated nut (13) is sealed with a sealing material (14), and the concrete (12) Pouring in the steel pipe segment (11); the embedded node (6) is composed of the steel pipe segment (11), concrete (12), prefabricated nut (13), sealing material (14), PVC pipe (15), foot plate ( 10), external stiffeners (9) and anchor bolts (2), foot plate (10), external stiffeners (9) and prefabricated nuts (13) are welded with steel pipe segments (11), anchor bolts (2) Fix it on the foot plate (10), place a PVC pipe at the reserved hole for the core-through bolt of the steel pipe section (11), pour concrete (12) in the steel pipe section (11); the connecting plate (4) is arranged according to the designed bolt position High-strength bolt holes and core-through bolt holes; At the pre-embedded node (6), bolt holes and core passages are reserved at the exposed end; the embedded end is welded to the foot plate (10) and the external stiffener (9), and the foot plate (10) is connected to the anchor bolt (2); The depth of the pre-buried section embedded in the cap (5) is not less than 1.5 times the length of the short side of the rectangular steel tube concrete, and the length of the exposed end is 1/2 of the length of the connecting plate (4); the pre-buried node (6) is mainly used for prefabricated assembly The pier column is connected with the cap (5), and the anchor bolt (2) is used to improve the pullout and shear resistance of the embedded joint (6); the design number of the high-strength bolts (7) and core-through bolts (8) is determined by The design lateral bearing capacity of the bridge pier is determined by the ratio of the allowable anti-sliding bearing capacity of a single bolt; the core-through bolts (8) and high-strength bolts (7) are arranged alternately and staggered, and the core-through bolts (8) on two adjacent sides are not at the same horizontal position , to prevent the core-through bolts (8) from intersecting in the prefabricated rectangular concrete-filled steel tube section (3); the bolt holes and core-through bolt holes on the connecting plate (4) and the reserved bolts on the prefabricated rectangular steel-filled steel tube concrete section (3) The holes correspond to the positions of the core bolt holes. 2. The fast-assembled prefabricated rectangular concrete-filled steel pipe pier based on bolt connection according to claim 1, characterized in that: the steel pipe at the bolt hole reserved for the prefabricated nut (13) and the prefabricated rectangular steel pipe concrete segment (3) The inner wall is spot-welded and fixed, and the unwelded end is sealed with a sealing material (14) to prevent the slurry water from overflowing when pouring the concrete (12) and the moisture outside the pier column from entering the prefabricated rectangular steel tube concrete segment (3) inside. 3. The fast-assembled prefabricated rectangular concrete-filled steel pipe pier based on bolt connection according to claim 1, characterized in that: the connecting plate (4) and the steel pipe segment (11) are tightly bonded to ensure that the lateral force The lower high-strength bolts (7) and the core-through bolts (8) are under tension and under pressure, so as not to be in a shear state. 4. The fast-assembled prefabricated rectangular concrete-filled steel pipe pier based on bolt connection according to claim 1, characterized in that: the inner diameter of the PVC pipe (15) should be 1-2mm larger than the diameter of the core-piercing bolt (8), which is convenient to wear The installation of the core bolt also leaves room for the deformation of the PVC pipe (15) during concrete pouring. 5. The fast-assembled prefabricated rectangular concrete-filled steel pipe bridge pier based on bolt connection according to claim 1 is characterized in that: the implementation method of the bridge pier is as follows, step 1: processing the prefabricated rectangular steel pipe concrete section (3), connecting plate (4 ), pre-embedded nodes (6), specifically include the following steps: 1) Prefabricated rectangular steel pipe concrete section (3), the prefabricated rectangular steel pipe concrete section (3) is manufactured in the factory, the plates are welded into rectangular steel pipes, and the welds should be groove penetration welds; reserved bolts are processed on the steel pipes Holes and core-through bolt holes. Align the prefabricated nut (13) with the axis of the reserved bolt hole and fix it by spot welding. The end of the nut that is not spot-welded with the inner wall of the steel pipe is sealed with a sealing material (14). Set the PVC pipe (15) at the position of the bolt hole, pass the core bolt (8) through the PVC pipe (15) and tighten it for temporary fixation, pour the concrete (12) and vibrate it for maintenance, the core bolt (8) can prevent the concrete from being poured and maintained Movement of the PVC pipe (15) and deformation of the steel pipe segment (11) during the process; 2) Make the connection plate (4), make the connection plate (4) in the factory, select and cut the plate according to the thickness size, process and reserve high-strength bolt holes and core-through bolt holes at the corresponding positions of the plate; 3) Make the pre-buried joints (6), make the pre-buried joints (6) in the factory, weld the foot plate (10) and the external stiffener (9) at the end of the prefabricated steel pipe concrete segment without bolt holes, and the foot plate (10 ) process bolt holes to connect anchor bolts (2); 4) Construction of the foundation cap (5) and the cover beam (1), pouring the foundation cap (5) and the cover beam (1) on site, and embedding two pre-buried nodes (6) into the foundation cap (5 ) and cap beam (1) are poured; Step 2: Assembly of the prefabricated segmental pier construction site, specifically including the following steps: 1) Install the foundation cap (5) of the pre-buried node (6) to the design position and fix it; remove the temporarily fixed core-through on the pre-buried node (6) and the prefabricated rectangular steel tube concrete section (3) during factory prefabrication Bolt (8); 2) Align the reserved bolt holes at the lower end of the connecting plate (4) with the reserved bolt holes at the top of the embedded node (6), and install high-strength bolts ( 7) and core-through bolts (8), fixing two adjacent connecting plates (4) to position and limit the adjacent prefabricated rectangular steel tube concrete segment (3) above the pre-embedded node (6) ; 3) Lift the prefabricated rectangular concrete-filled steel tube segment (3) to the corresponding design position with a hoist, install the remaining two connecting plates (4), and tighten the high-strength bolts (7) and core-through bolts ( 8); 4) Repeat step 2) and step 3) to install the connecting plate (4) of the next node and the installation of the prefabricated rectangular concrete-filled steel pipe section (3), until all the prefabricated rectangular concrete-filled steel pipe sections (3) are installed; 5) Finally, repeat step 2), install the joint connection plate (4) of the prefabricated cover beam (1) and its adjacent prefabricated rectangular steel tube concrete segment (3), tighten the high-strength bolts (7) corresponding to the reserved bolt holes and wear through core bolt (8); For the reserved bolt holes described in step 1) in step 1, the corresponding steel pipe segment (11) and connecting plate (4) should be fixed according to the position after installation and forming, and then drilled uniformly to ensure the reserved bolt holes inside and outside Fully aligned, and after drilling, it is necessary to grind the burrs on the inner and outer sides of the reserved bolt holes to avoid jamming caused by burrs during the installation project.