CN110725195A - A connection method and application of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and poured after RPC - Google Patents

Abstract

The invention relates to a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC. The prefabricated pier column and the foundation cap are connected, including: (1) pre-embedding the anchor steel bar at the lower end of the prefabricated pier column and fixing it with stirrups; A reserved pit is set on the top surface of the foundation cap, and anchoring steel bars are pre-embedded at the bottom of the reserved pit of the foundation cap and fixed with stirrups; (2) The prefabricated pier is lifted, and the prefabricated pier is aligned with the reserved pit, and the prefabricated pier The overhanging connecting section of the anchoring steel bar of the column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap; (3) The active powder concrete is poured into the reserved pit and the connection is completed after the solidification reaches the strength. The invention also relates to the application of a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC, which is applied to medium and small-span viaducts and overpasses with a single-hole span of 40m. The invention only needs normal temperature maintenance, has the advantages of simple and convenient construction method, high speed and reliable force, and belongs to the technical field of building construction.

Description

A connection method of prefabricated bridge pier and cap anchoring steel bar sleeve inserted and poured after RPC and the same its application

technical field

The invention relates to the technical field of building construction, in particular to a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC and its application.

Background technique

In urban traffic, viaducts and overpasses with medium and small spans are the most widely used. During the construction of bridges, a certain amount of ground needs to be occupied, which will have a certain or even great impact on the passage of vehicles and pedestrians.

In the most conventional construction methods of existing bridges, the piers are all constructed with cast-in-place concrete. Due to the on-site pouring and maintenance of concrete, the area is large, the construction period is long, and the traffic is greatly affected. It is necessary to adopt a construction method that shortens the construction period as much as possible and occupies a small area.

SUMMARY OF THE INVENTION

Aiming at the technical problem that the construction methods of the existing urban medium and small span viaducts and overpasses have a greater impact on urban traffic, the purpose of the present invention is to provide a kind of prefabricated bridge pier and cap anchorage that is fast in construction, does not require formwork, and has reliable connection The connection method and application of RPC after inserting and inserting steel bars.

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

A connection method of prefabricated bridge pier and cap anchoring steel bar sleeve inserting and pouring RPC, connecting a prefabricated pier column and a foundation cap, comprising the following steps: (1) pre-embedding anchor steel bars at the lower end of the prefabricated pier column and fixing with stirrups, A reserved pit is set on the top surface of the foundation cap, and anchoring steel bars are embedded at the bottom of the reserved pit of the foundation cap and fixed with stirrups; (2) The prefabricated pier is lifted, and the prefabricated pier is aligned with the reserved pit. The overhanging connection section of the anchoring steel bar of the prefabricated pier column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap; (3) The active powder concrete is poured into the reserved pit and the connection is completed after the solidification reaches the strength.

As a preference, it is cured at room temperature after connection.

As a kind of preference, step (1) is specifically as follows: the lower end of the prefabricated pier is pre-embedded with anchoring steel bars, and the anchoring steel bars include an embedded section located in the prefabricated pier column concrete and an overhanging connecting section located outside the prefabricated pier column concrete. Arranged in the cross-sectional shape of prefabricated piers, the anchoring steel bars are fixed by stirrups; the foundation caps are provided with reserved pits, and the anchoring steel bars are pre-embedded in the foundation caps. It includes the outrigger connection section located outside the foundation cap concrete and located in the reserved pit groove, the arrangement shape of the anchoring steel bar is corresponding to the shape of the prefabricated pier column, and the anchoring steel bar is fixed by the stirrup.

As a preference, the cross-sectional shape of the prefabricated pier column is circular or rectangular, and the arrangement shape of the anchoring steel bars of the prefabricated pier column and the foundation cap is the same as the cross-sectional shape of the prefabricated pier column.

As a preference, the length of the embedded section and the overhanging connecting section of the prefabricated pier column anchoring steel bar and the foundation cap anchoring steel bar are equal to the length of the long side of the section of the prefabricated pier column, but the length of the overhanging connecting section is less than the length of the reserved pit. The depth is 5-10 cm; the shape and size of the anchoring steel bars of the foundation cap are smaller than the shape and size of the anchoring steel bars of the prefabricated piers, and the distance is 8-12 cm.

As a preference, the cross-sectional shape of the reserved pit is the same as that of the prefabricated pier; the cross-sectional size of the prefabricated pier is 10-15 cm smaller than that of the reserved pit.

As a preference, in step (1), in the prefabricated piers and foundation caps, the anchoring steel bars are arranged along the vertical direction and arranged in a ring shape along the horizontal direction, and the ring-shaped stirrups are arranged in order along the high and low positions. The interval is 10-15 cm, and it is smeared into a bevel.

As a preference, the anchoring steel bars and stirrups are fixed by welding or binding.

As a preference, in step (3), the poured reactive powder concrete is 5-10 cm higher than the top surface of the foundation cap.

The application of a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC is applied to medium and small-span viaducts and overpasses with a single-hole span of 40m.

In general, the present invention has the following advantages:

1. The structure is simple and the construction is convenient. It only needs to be maintained at room temperature, which can shorten the construction period, occupy less space and reduce the impact on urban traffic.

2. Realize the rapid construction of the connection between the prefabricated piers and the bearing platform foundation of urban medium and small span bridges.

3. The joint reinforcement structure is simple, and the post-cast RPC has high strength and reliable force.

4. Active powder concrete has the characteristics of high strength, corrosion resistance and good durability. It does not need steam curing. It can be cured at room temperature for 24 hours. The compressive strength can reach more than 65MPa, and the flexural strength can reach more than 10MPa. Work. Connected by active powder concrete, the joint has strong tensile capacity and mechanical reliability, and the rapid splicing of the bridge substructure is realized.

Description of drawings

Figure 1 is a schematic diagram of a connection method of a fabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC.

FIG. 2 is a cross-sectional view of the rectangular pier-column connection structure in the A-A direction according to the first embodiment.

3 is a cross-sectional view of the circular pier-column connection structure of the second embodiment in the direction A-A.

Figure 4 is a schematic diagram of the structure before assembly.

Among them, 1 is the prefabricated pier column, 2 is the foundation cap, 3 is the anchoring steel bar of the prefabricated pier column, 4 is the stirrup of the prefabricated pier column, 5 is the reserved pit, 6 is the anchoring steel bar of the foundation cap, and 7 is the The stirrups of the foundation cap, 8 are reactive powder concrete.

Detailed ways

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

Example 1

A method for connecting a prefabricated bridge pier and a cap anchoring steel bar sleeve and then pouring RPC, specifically comprising the following steps:

(1) Pre-embed anchor steel bars at the lower end of the prefabricated pier column along the periphery of the section. The length of the embedded section and the overhanging connection section of the anchor steel bar is approximately equal to the length of the long side or the diameter of the section of the prefabricated pier column, and stirrups with a spacing of about 15 cm are used. Welding or binding to fix.

(2) Set a reserved pit groove on the top surface of the foundation cap. The depth of the reserved groove is 5-10 cm greater than the connecting length of the anchoring steel bars embedded in the prefabricated pier column. The plane shape of the prefabricated pit groove and the cross section of the prefabricated pier column The shape is the same, but the plane size and the periphery are larger than the section size of the prefabricated pier by about 10-15 cm, so that the lower end of the prefabricated pier can be inserted.

(3) Anchoring steel bars are also pre-buried at the bottom of the reserved pits of the foundation caps, and their layout plan is consistent with the anchoring steel bars of the prefabricated piers and staggered from each other. The length of the overhanging connection section of the anchoring steel bar is the same as the connecting length of the anchoring steel bar embedded in the prefabricated pier and column, and is fixed by welding or binding with stirrups with a spacing of about 15 cm.

(4) Lift the prefabricated assembly at the lower end of the pier column, and the overhanging connection section of the anchoring steel bar of the prefabricated pier column extends downward into the reserved pit groove of the foundation cap, and the overhanging connection section of the anchoring steel bar of the foundation cap is sleeved. within it.

(5) After the prefabricated piers are positioned accurately, pour the reactive powder concrete until it is 5 to 10 cm above the top surface of the foundation cap, and complete the connection after the solidification reaches the strength.

After the above connection method is cured at room temperature for 24 hours, the RPC strength of the connection can reach more than 65MPa.

In this embodiment, the cross-sectional shape of the prefabricated pier is rectangular, and the cross-sectional shape of the reserved pit is also rectangular, but the circumference is 10 cm larger than the former; the anchoring bars of the prefabricated pier are arranged in a rectangular ring, 7 cm away from the edge of the concrete section ; The anchoring steel bars of the foundation cap are also arranged in a rectangular ring, but the size is smaller than the size of the rectangular ring enclosed by the anchoring steel bars of the prefabricated pier column, and the two rectangular rings are 10-15 cm apart; the embedded section of the anchoring steel bar of the prefabricated pier column The length of the connecting section with the overhanging connecting section and the anchoring steel bar of the foundation cap is equal to the length of the long side of the cross-section of the prefabricated pier column, but the length of the overhanging connecting section is 5-10 cm less than the depth of the reserved pit.

The anchoring steel bars of the prefabricated pier column include the embedded section located in the prefabricated pier column concrete and the overhanging connection section located outside the prefabricated pier column concrete, which are all fixed by stirrups.

The foundation cap is provided with a reserved pit, and the pre-embedded anchoring steel bars in the foundation cap include an embedded section located in the concrete of the foundation cap, and also includes an overhanging connecting section located outside the foundation cap and in the reserved pit. , are fixed by stirrups.

During assembly, the overhanging connecting section of the anchoring steel bar of the prefabricated pier column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap. In order to reserve space for splicing and facilitate construction, the distance between the two is about 10 cm. In the prefabricated pier column and the foundation cap, the anchoring steel bars are arranged in the vertical direction, arranged in a ring shape along the horizontal direction, and are fixed by welding or tying closed stirrups with an interval of 10-15 cm.

Reactive powder concrete is poured in reserved pits. The poured reactive powder concrete is 5-10 cm higher than the top surface of the foundation cap. Reactive Powder Concrete has not been used for a long time in China. It has the characteristics of high strength, corrosion resistance and durability. It does not need steam curing. It can be cured at room temperature for 24 hours. The compressive strength can reach more than 65MPa, and the flexural strength can be up to 10MPa or more.

The invention connects all the steel bars into a whole by anchoring the steel bars and pouring the RPC, which has the characteristics of reliable force, convenient construction, fast speed, and only needs normal temperature maintenance, does not affect the appearance of the bottom of the bridge pier column, and rarely affects the pier Use of the ground around the column.

The invention is applied to medium and small-span viaducts with a single-hole span of 40m.

Embodiment 2

In this embodiment, the cross-sectional shape of the prefabricated pier is circular, and the cross-sectional shape of the reserved pit is also circular. It is only necessary to change the rectangle involved in the first embodiment to a circle, and the rest are exactly the same.

The present invention is applied to small and medium-span overpasses with a single-hole span of 40m.

In addition to the methods mentioned in the above embodiments, the prefabricated piers can be prefabricated concrete piers with any cross-sectional shape; the anchoring steel bars can be other annular rings except rectangular rings or circular rings. These transformations are all within the protection scope of the present invention.

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. a connection method of prefabricated bridge pier and cap anchoring steel bar sleeve inserted and poured RPC, the prefabricated pier column and the foundation cap are connected, it is characterized in that: comprise the steps: (1) Pre-embed anchor steel bars at the lower end of prefabricated piers and fix them with stirrups; set reserved pits on the top of the foundation cap, and pre-embed anchor bars at the bottom of the reserved pits of the foundation caps and fix them with stirrups; (2) Lift the prefabricated pier column, align the prefabricated pier column with the reserved pit groove, and cover the overhanging connection section of the anchoring steel bar of the prefabricated pier column outside the overhanging connecting section of the anchoring steel bar of the foundation cap; (3) Pour active powder concrete into the reserved pit, and complete the connection after the solidification reaches the strength. 2. The connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserting and pouring RPC according to claim 1, characterized in that: after connecting, it is cured at room temperature. 3. according to the connection method of a kind of prefabricated bridge pier and the capping anchoring steel bar sleeve inserting and pouring RPC according to claim 1 and 2, it is characterized in that: step (1) is specifically: the lower end of the prefabricated pier column is embedded with anchoring steel bar , the anchoring steel bar includes an embedded section located in the concrete of the prefabricated pier column and an overhanging connecting section located outside the concrete of the prefabricated pier column. Reserved pits, anchoring steel bars are pre-embedded in the foundation cap, and the anchoring bars include the embedded section located in the concrete of the foundation cap, and also include the outrigger connection section located outside the concrete of the foundation cap and located in the reserved pit, the anchorage The shape of the arrangement of steel bars corresponds to the shape of the prefabricated piers, and the anchoring steel bars are fixed by stirrups. 4. The connection method of a prefabricated bridge pier and the capping anchoring steel bar sleeve inserting and pouring RPC according to claim 3 is characterized in that: the cross-sectional shape of the prefabricated pier column is a circle or a rectangle, and the prefabricated pier column and the foundation bearing The arrangement shape of the anchoring steel bar of the platform is the same as that of the prefabricated pier column. 5. according to the connection method of a kind of prefabricated bridge pier and cap anchoring steel bar sleeve inserting and pouring RPC according to claim 4, it is characterized in that: the embedded section and the overhang of prefabricated pier column anchoring steel bar and foundation cap anchoring steel bar The length of the connecting section is equal to the length of the long side of the section of the prefabricated pier column, but the length of the overhanging connecting section is 5-10 cm less than the depth of the reserved pit; The shape and size of the steel bars are 8-12 cm apart. 6. according to the connection method of a kind of prefabricated bridge pier and the capping anchoring steel bar sleeve inserted and poured RPC according to claim 3, it is characterized in that: the cross-sectional shape of the reserved pit is the same as the cross-sectional shape of the prefabricated pier column; the prefabricated pier The section size of the column is 10-15 cm smaller than the section size of the reserved pit. 7. according to the connection method of a kind of prefabricated bridge pier and the capping anchoring steel bar sleeve inserting and pouring RPC according to claim 1 or 2, it is characterized in that: in step (1), in the prefabricated pier column and the foundation cap, the anchoring steel bar is It is arranged along the vertical direction, and arranged in a ring shape along the horizontal direction. 8. The connection method of the assembled bridge pier and the cap anchoring steel bar sleeve inserting and pouring the RPC according to claim 8, wherein the anchoring steel bar and the stirrup are fixed by welding or binding. 9. according to the connection method of a kind of prefabricated bridge pier and the capping anchoring steel bar sleeve inserting and pouring RPC according to claim 1 or 2, it is characterized in that: in step (3), the active powder concrete poured is higher than the foundation cap The top surface of the 5-10 cm, smeared into a bevel. 10. An application of a method for connecting a prefabricated bridge pier and a cap anchoring steel bar and then pouring RPC, characterized in that it is applied to medium and small-span viaducts and overpasses with a single-hole span of 40m.

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