CN107299588A - Prefabricated concrete-filled steel tube and spiced by steel reinforced concrete bridge pier - Google Patents

Abstract

The invention relates to a prefabricated steel pipe concrete and reinforced concrete assembled bridge pier, which includes a bridge pier foundation, a prefabricated steel pipe concrete section, one or more prefabricated reinforced concrete middle sections and a prefabricated reinforced concrete top section, wherein the bridge pier foundation The prefabricated steel pipe concrete section is fixedly connected with the prefabricated steel pipe concrete section by means of the bottom anchor bolt arranged on the foundation of the bridge pier. The middle sections, the prefabricated reinforced concrete middle section and the prefabricated reinforced concrete top section are fixedly connected by means of connecting units. The structure of each part of the invention is simple, which not only facilitates factory prefabrication, but also facilitates on-site splicing, so as to improve the construction operation speed and effectively reduce the on-site operation intensity. The assembled bridge pier not only has high bearing capacity, good compressive resistance, bending resistance, shear resistance, and good durability, but also has the advantages of good seismic performance.

Description

Prefabricated steel pipe concrete and reinforced concrete bridge piers

technical field

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

Background technique

At present, most of the bridges built in my country are composed of cast-in-place reinforced concrete abutments, cast-in-place concrete piers, cast-in-place concrete bridge decks and precast concrete beams. Cast-in-place concrete construction is time-consuming and requires many on-site construction procedures that negatively affect traffic flow, safety in the work area and the environment, especially in complex construction environments, construction spaces, climatic conditions and environmental protection Conditions and other factors seriously affect the progress of bridge construction.

Research on the connection technology between precast concrete piers and foundations, the connection technology between precast concrete sections, the connection between precast concrete sections and cover beams, and the mechanical performance after connection, especially the seismic performance of integral pier columns after connection Relatively few, so that its scope of application is still limited.

Contents of the invention

(1) Technical problems to be solved

In order to solve the above-mentioned problems in the prior art, the present invention provides a prefabricated steel pipe concrete and reinforced concrete bridge pier, which has the advantages of strong practicability, good durability, and superior seismic performance. construction period, and can effectively protect the construction environment.

(2) Technical solution

In order to achieve the above object, the main technical solutions adopted in the present invention include:

A prefabricated steel pipe concrete and reinforced concrete assembled bridge pier, which includes a bridge pier foundation, a prefabricated steel pipe concrete section, one or more prefabricated reinforced concrete middle sections and a prefabricated reinforced concrete top section, wherein the bridge pier foundation and the prefabricated The concrete-filled steel pipe section is fixedly connected by means of bottom anchor bolts arranged on the pier foundation, and the prefabricated steel pipe concrete section is connected with the prefabricated reinforced concrete middle section and between a plurality of prefabricated reinforced concrete middle sections. The room, the prefabricated reinforced concrete middle segment and the prefabricated reinforced concrete top segment are fixedly connected by means of connecting units.

As a preferred solution for assembling bridge piers as described above, the connecting unit includes a plurality of hollow connectors and longitudinal steel bars extending from the inside of the connectors to the lower end of the prefabricated reinforced concrete intermediate section where the plurality of connectors It is arranged at intervals along the upper side of the prefabricated steel pipe concrete segment or each prefabricated reinforced concrete intermediate segment, and the connectors are embedded in the respective concrete segments; the hollow connectors include open upper and lower The side surface near the upper and lower ends is provided with an injection nozzle extending laterally outside the segment, the injection nozzle is detachable and communicated with the inside of the connector;

The longitudinal steel bar is exposed from the position corresponding to the connector at the lower end of each prefabricated reinforced concrete middle section, and the exposed longitudinal steel bar is correspondingly inserted into the adjacent connector, and the upper end of the longitudinal steel bar extends into each at least a portion of said connector corresponding to the upper end;

The upper end of the prefabricated reinforced concrete top section is provided with pre-embedded top anchor bolts, and the lower end of the prefabricated reinforced concrete top section is provided with exposed longitudinal reinforcement corresponding to the position of the connector in the prefabricated reinforced concrete middle section. The exposed longitudinal steel bar is inserted into the corresponding connector, and the upper end of the longitudinal steel bar is parallel to the upper end of the prefabricated reinforced concrete top section.

As a preferred solution for assembling the bridge piers as described above, after the assembled bridge piers are spliced, inject grouting material into the injection nozzle at the lower end of the hollow connector, and when the grouting material fills the hollow connector, unload Lower all the injection nozzles, and seal the injection port connecting the injection nozzles.

As a preferred solution for assembling bridge piers as described above, the connecting unit includes connecting bolts, connecting steel plates and connecting anchor bars, wherein the connecting bolts are pre-embedded in the prefabricated steel pipe concrete segment and the middle of the prefabricated reinforced concrete section and the upper surface of the prefabricated reinforced concrete top section, the connecting steel plate is fixed on the lower end of the prefabricated reinforced concrete middle section and the prefabricated reinforced concrete top section, and the lower end of the connecting anchor bar is fixed Connected to the middle of the upper surface of the connecting steel plate, the upper end of the connecting anchor bar is bent downward; the connecting steel plate is provided with a through hole corresponding to the connecting bolt, and the middle section of the prefabricated reinforced concrete and the A cavity for pouring concrete is provided at the lower end of the prefabricated reinforced concrete top segment corresponding to the above through hole.

As a preferred solution for the assembled bridge pier as described above, the assembled bridge pier also includes a cover beam, the cover beam is arranged above the prefabricated reinforced concrete top section, and the two are pre-embedded in the prefabricated reinforced concrete The top anchor bolt above the top section is connected to the corresponding reserved hole on the cover beam, and a cavity for pouring concrete is provided above the reserved hole.

As a preferred solution for assembling bridge piers as described above, the prefabricated steel pipe concrete segment includes a steel pipe with concrete poured in the middle, a base plate and a plurality of shear connectors, and the shear connectors are all fixed to the steel pipe Inner wall, the base backing steel plate is arranged at the bottom of the steel pipe, the area of the base backing steel plate is larger than the cross-sectional area of the steel pipe, and the base backing steel plate outside the projected area of the main body of the steel pipe corresponds to the bottom anchor Bolt set connection hole.

As a preferred solution for assembling bridge piers as described above, the shear connectors are all studs, the nail tips of the studs are welded to the steel pipes, and the studs are arranged in a staggered manner.

As a preferred solution for assembling bridge piers as described above, the shear connectors are all steel plates with holes, and the steel plates with holes are strip-shaped steel plates with a plurality of equidistant through holes, and the steel plates with holes are parallel to each other. fixed on the inner wall of the steel pipe. Further, steel bars can be arranged in the through holes for better connection.

As a preferred solution for assembling bridge piers as described above, the prefabricated reinforced concrete middle segment and the prefabricated reinforced concrete top segment are concrete with a plurality of longitudinal steel bars and a plurality of stirrups inside, wherein a plurality of the longitudinal The reinforcing bars are arranged at intervals around the edge of the concrete, and a plurality of stirrups are fixed around the outer sides of all the longitudinal reinforcing bars, and are arranged at longitudinal intervals along the longitudinal reinforcing bars.

As a preferred solution for assembling bridge piers as described above, the cross-sections of the prefabricated steel pipe concrete section, the prefabricated reinforced concrete middle section and the top stage are circular, square, elliptical or other shapes.

(3) Beneficial effects

The beneficial effects of the present invention are:

The prefabricated steel pipe concrete and reinforced concrete assembled bridge pier provided by the present invention adopts the prefabricated steel pipe concrete segment above the foundation of the bridge pier column, while the other parts of the pier body adopt the middle segment and the top segment of prefabricated reinforced concrete, and the joint is poured or Infusion strengthens and fixes the connection strength between two adjacent prefabricated steel pipe concrete sections or reinforced concrete middle sections, and reasonably connects the prefabricated steel pipe concrete sections with the prefabricated reinforced concrete middle section and the top section into a whole. By means of on-site pouring or pouring during the later connection, not only can the connection strength of two adjacent prefabricated reinforced concrete column segments be guaranteed, so as to ensure the overall quality of the pier, but also the components of each part have a simple structure, which is not only convenient for factory prefabrication, but also It is convenient for on-site splicing to increase the speed of construction operations and effectively reduce the intensity of on-site operations. The assembled bridge pier not only has high bearing capacity, good compressive resistance, bending resistance, shear resistance, and good durability, but also has the advantages of good seismic performance. Through prefabrication in advance and on-site splicing, it has the advantages of fast construction speed, no impact on normal traffic, short construction period, low construction noise, and less material storage space, which is conducive to protecting the construction environment on site.

Further, a shear connector is provided in the prefabricated concrete-filled steel tube section to form a whole with the steel tube and the concrete, to jointly bear force and coordinate deformation, and to improve the seismic performance.

Description of drawings

Fig. 1 is a longitudinal sectional view of a preferred assembled pier overall structure of the present invention;

Fig. 2 is the structural representation of the prefabricated steel pipe concrete section in Fig. 1 of the present invention;

Fig. 3 is a cross-sectional schematic view at I in Fig. 2;

Fig. 4 is a cross-sectional schematic view at II in Fig. 2;

Fig. 5 is a schematic structural view of the prefabricated reinforced concrete middle segment in Fig. 1;

Fig. 6 is a schematic cross-sectional view at III in Fig. 5;

Fig. 7 is a schematic cross-sectional view at IV in Fig. 5;

Fig. 8 is a schematic structural view of a preferred shear connector;

Fig. 9 is a longitudinal sectional view of another preferred assembled pier overall structure;

Fig. 10 is a schematic structural view of the prefabricated reinforced concrete middle segment in Fig. 9;

Fig. 11 is a schematic cross-sectional view at V in Fig. 10;

Fig. 12 is a schematic cross-sectional view at VI in Fig. 10;

Fig. 13 is a schematic cross-sectional view of the upper end of the prefabricated reinforced concrete top segment in Fig. 9;

Fig. 14 is the structural representation of connecting bolt;

Fig. 15 is a structural schematic diagram of a steel plate with holes.

[Description of Reference Signs]

1: pier foundation;

2: Prefabricated steel tube concrete segment;

3: Prefabricated reinforced concrete middle segment;

4: Prefabricated reinforced concrete top segment;

5: Bottom anchor bolt;

6: steel pipe;

7: Base pad steel plate;

8: connection hole;

9: Connector;

10: Longitudinal reinforcement;

11: injection nozzle;

12: Stirrup;

13: cover beam;

14: top anchor bolt;

15: Pouring concrete after covering the beam;

16: shear connector;

17: connecting bolts;

18: connecting steel plate;

19: connect the anchor bars;

20: Concrete is poured after the connection;

21: through hole;

22; Concrete cavity is poured after the joint;

23: cap bolt;

24: bolt cap backing plate;

25: nut backing plate;

26: fastening nut;

27: Strip-shaped steel plate.

detailed description

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

Example 1

A kind of prefabricated steel pipe concrete and reinforced concrete assembled bridge pier, as shown in Figure 1, it includes successively from bottom to top pier foundation 1, prefabricated steel pipe concrete section 2, one or more prefabricated reinforced concrete intermediate sections 3 and prefabricated reinforced concrete The top section 4, wherein, the bridge pier foundation 1 and the prefabricated steel pipe concrete section 2 are fixedly connected by means of the bottom anchor bolt 5 arranged on the bridge pier foundation 1, and the prefabricated steel pipe concrete section 2 and the prefabricated reinforced concrete middle section 3 , and a plurality of prefabricated reinforced concrete middle sections 3, and between the prefabricated reinforced concrete middle section 3 and the prefabricated reinforced concrete top section 4 are fixedly connected by means of connecting units.

Specifically, as shown in Fig. 2-Fig. 4, Fig. 3 and Fig. 4 are schematic diagrams of the cross-sectional structure at I and II in Fig. The base plate 7 is fixed at the bottom, the area of the base plate 7 is larger than the area of the steel pipe 6, and the base plate 7 outside the projected area of the steel pipe 6 is provided with a connecting hole 8 corresponding to the bottom anchor bolt 5, and the prefabricated steel pipe concrete section The cross-section of the section 2 is set to be circular, and the cross-sections of the prefabricated reinforced concrete middle section 3 and the prefabricated reinforced concrete top section 4 are correspondingly set to be circular.

The connection unit includes a plurality of connectors 9 and a plurality of exposed longitudinal steel bars 10, specifically, a plurality of connectors 9 arranged at intervals along the upper side of the prefabricated steel pipe concrete section 2, and the connectors 9 are embedded in the prefabricated steel pipe concrete section In 2, it is arranged at intervals close to the outer edge of the prefabricated steel pipe concrete section 2, and the connector 9 is a cavity, and the upper and lower ends of the cavity corresponding to the side of the prefabricated steel pipe concrete section 2 are provided with detachable injection nozzles 11 , the injection nozzle 11 communicates with the cavity of the connector 9, and the detachable injection nozzle can be set through threaded connection.

As shown in Fig. 5-Fig. 7, a longitudinal steel bar 10 is correspondingly provided at the position corresponding to the connector 9 of the prefabricated reinforced concrete middle section 3; Longitudinal reinforcement, the exposed longitudinal reinforcement can just extend into the cavity of the connector 9 of the adjacent segment, and the upper end of the prefabricated reinforced concrete middle segment 3 corresponds to the corresponding position of the upper end connector of the prefabricated steel pipe concrete segment 2. A part of the upper end of the longitudinal steel bar 10 in this section is inserted into the connector 9 to set, then the prefabricated reinforced concrete middle section 3 is arranged with a plurality of longitudinal steel bars 10 at intervals around the edge of the concrete, and a part of the lower end of the longitudinal steel bar 10 exceeds the prefabricated A part of the lower surface of the reinforced concrete middle segment 3 is used as a part of the connection unit connecting the next segment. In addition, in order to fasten the structure, a plurality of stirrups 12 are fixed around the periphery of the longitudinal reinforcement 10, and the stirrups 12 are all fixed around On the outside of all the longitudinal reinforcement bars 10, the longitudinal reinforcement bars 10 are arranged at intervals in the longitudinal direction.

The prefabricated reinforced concrete top section 4 is different from the prefabricated reinforced concrete middle section 3 in that there is no connector 9 at its upper end, but a top anchor bolt is pre-embedded, and the top anchor bolt is close to the center of the prefabricated reinforced concrete top section 4 set, and the upper end of the longitudinal reinforcement 10 is parallel to the upper end of the prefabricated reinforced concrete top section 4.

When splicing bridge piers, two adjacent prefabricated reinforced concrete intermediate sections 3 are hoisted and placed above the prefabricated steel pipe concrete section 2, and the exposed longitudinal steel bar 10 is just inserted into the connector 9 of the prefabricated steel pipe concrete section 2. The injection nozzle 11 is specially used for high-strength, non-shrinkage grouting material, such as JG/T 408-2013 sleeve grouting material for steel bar connection, which can flow out from the upper injection nozzle 11 after filling the cavity of the connector 9 Stop grouting, and then remove the injection nozzle 11 to close the injection port.

The upper end of the prefabricated reinforced concrete top section 4 is also provided with a cover beam 13, and a through hole is reserved on the cover beam 13 corresponding to the top anchor bolt at the upper end of the prefabricated reinforced concrete top section 4, and a through hole is reserved in the upper part of the through hole. After the cover beam, the concrete cavity is poured, and after the cover beam 13 is connected by bolts, the concrete is poured in the cavity after the cover beam to form the cover beam and then the concrete is poured 15, and the cover beam is poured with concrete 15 to strengthen the cover beam 13 and the prefabricated steel bars The connection of the concrete middle segment 3, and plays a sealing role on the exposed part of the top anchor bolt.

In addition, in the prefabricated CFST section, multiple shear connectors 16 are provided on the inner wall of the steel pipe 6. The shear connectors 16 can greatly strengthen the connection strength between the steel pipe 6 and the concrete, and improve the overall bearing capacity of the CFST segment. ability. The shear connector 16 can be set as a stud, as shown in FIG. 8 , the nail tip of the stud is welded on the steel pipe 6 , and a plurality of studs are arranged in a staggered manner.

The manufacturing method of each component of the prefabricated steel pipe concrete and reinforced concrete assembled pier in this embodiment, as shown in Figure 1, includes the following steps:

(1) Fabrication of steel pipe concrete section: manufacture steel pipe 6 according to the design requirements, weld shear connector 16 in steel pipe 6, weld steel pipe 6 on base plate 7, fix connector 9, and pour concrete in steel pipe 6 , forming a concrete filled steel tube segment;

(2) Make reinforced concrete middle section: make formwork and reinforcement skeleton (longitudinal steel bar 10 and stirrup 12), fix connector 9, pour concrete in formwork, form reinforced concrete middle section;

(3) Making the reinforced concrete top section: making formwork, reinforcing steel skeleton (longitudinal reinforcement 10 and stirrup 12), fixing jack bolts, pouring concrete in the formwork to form the reinforced concrete top section;

(4) On the pier foundation 1, the bottom anchor bolts are pre-embedded;

(5) Make the cover beam 13, and pour concrete cavities and through holes after setting the joints.

Installation of the above components:

(1) Fix the steel pipe concrete segment 2 on the pier foundation 1 through the embedded bottom anchor bolt 5;

(2) Insert the protruding steel bar in the reinforced concrete middle section 3 into the connector 9 of the steel pipe concrete section 2;

(3) Insert the protruding steel bars placed in the reinforced concrete middle segment 3 above into the adjacent connector 9 placed below;

(4) Insert the protruding steel bars in the reinforced concrete top section 4 placed above into the connector 9 of the adjacent reinforced concrete middle section 3 placed below;

(5) The cover beam 13 is placed on the reinforced concrete top section 4, and the pre-embedded top anchor bolt 14 of the reinforced concrete top section 4 passes through the through hole of the cover beam 13, and is fixed with a nut;

(6) Through the injection nozzle 11, inject the grouting material into the connector 9 from bottom to top;

(7) Remove the injection nozzle 11, and close the injection port with concrete;

(8) Concrete is poured in the cavity of the cover beam 13 to form the post-concrete 15 of the cover beam.

Example 2

This embodiment is based on embodiment 1, as shown in the figure, it is different from embodiment 1 in that the cross-sections of prefabricated steel pipe concrete segment 2, prefabricated reinforced concrete middle segment 3 and prefabricated reinforced concrete top segment 4 are all square , that is, the steel pipes in the prefabricated steel pipe concrete segment 2 are also set in a square shape, and of course they can be set in other shapes as required.

The connecting unit in this embodiment is different from that in Embodiment 1. As shown in FIG. 9 , the connecting unit includes connecting bolts 17 , connecting steel plates 18 and connecting anchor bars 19 . Connecting bolt 17 is the top that is embedded in the lower segment, and is arranged at intervals along the edge of the segment. Connecting steel plate 18 is arranged at the lower end of the upper segment. hole, the top of the through hole is reserved with a joint before pouring a concrete cavity, which is used to pour concrete 20 after forming the joint, so as to seal the exposed part of the connecting bolt and strengthen the connection; in the middle of the connecting steel plate 18, a connecting anchor bar 19 is provided The upper end of the connecting anchor bar 19 is set as a downwardly bent hook, and the downwardly bent hook shape is used to strengthen the anchorage between the concrete and the connecting steel plate 18 and improve the resistance of the connecting position.

As shown in Figures 10-12, the prefabricated reinforced concrete middle segment 3 is provided with a connecting steel plate 18 at the lower end, and the corresponding connecting bolt 17 on the connecting steel plate 18 is provided with a through hole 21 for connection, and the upper part of the through hole is provided with a joint. Concrete cavity 22 is poured, connecting anchor bar 19 is provided in the middle of the upper surface of connecting steel plate 18, the lower end of connecting anchor bar 19 is fixedly connected to connecting steel plate 18, and the upper end of connecting anchor bar 19 is bent downward; prefabricated reinforced concrete middle section 3 There are also longitudinal reinforcing bars 10 at intervals around the edge of the edge, and stirrups 12 are fixed around the periphery of all longitudinal reinforcing bars 10, and a plurality of stirrups 12 are arranged at longitudinal intervals along the longitudinal reinforcing bars 10, and the prefabricated reinforced concrete middle segment 3 The upper end is pre-embedded with connecting bolts 17, which are used to fix the two adjacent segments with the upper segment through nuts.

Connecting bolts 17 are pre-embedded at intervals along the outer edge of the upper end of the prefabricated steel pipe concrete section.

As shown in Figure 13, the prefabricated reinforced concrete top section is different from the prefabricated reinforced concrete middle section in that the position of the top anchor bolt 14 embedded in the upper end is different from that of the connecting bolt 17, and the top anchor bolt 14 is located at the prefabricated reinforced concrete top section. Central setting on the upper surface of the segment.

As shown in Figure 14, the connecting bolt and the top anchor bolt can be set to include a cap bolt 23, a bolt cap backing plate 24, a nut backing plate 25 and a fastening nut 26, wherein the cap bolt 23, the bolt cap backing plate 24 are used After being pre-embedded in concrete and installing the upper segment, the nut backing plate 25 and the fastening nut 26 are sleeved in the cap bolt 23 for fastening.

The manufacturing method of each component of the prefabricated steel pipe concrete and reinforced concrete assembled pier in this embodiment, as shown in Figure 9, is different from the steps in Embodiment 1:

(1) Making the steel pipe concrete segment 2: the fixed connector 9 becomes the fixed connection anchor bolt 17, and other operations remain unchanged;

(2) Make the reinforced concrete middle section: connect the steel plate 18 to open through holes, weld and connect the anchor bar 19, make the formwork and steel bar skeleton (longitudinal steel bar 10 and stirrup), fix the connecting steel plate 18, connecting bolt 17, after setting the joint Pouring the concrete cavity, pouring concrete in the formwork to form the prefabricated reinforced concrete middle segment 3;

(3) Make the reinforced concrete top section: connect the steel plates 18 to open through holes, weld and connect the anchor bars 19, make formwork, steel bar skeletons (longitudinal steel bars 10 and stirrups), fix the top anchor bolts 14, and pour concrete voids after setting the joints. Cavity, concrete is poured in the template to form the prefabricated reinforced concrete top section 4.

Component installation steps are as follows:

(1) Fix the prefabricated steel pipe concrete segment 2 on the pier foundation 1 through the embedded bottom anchor bolt 5;

(2) Put the prefabricated reinforced concrete middle section 3 on the prefabricated steel pipe concrete section 2, and the connecting bolts 17 on the prefabricated steel pipe concrete section 2 penetrate into the reserved passage of the connecting steel plate 18 in the prefabricated reinforced concrete middle section 3 holes, and fixed with fastening nuts;

(3) Put the prefabricated reinforced concrete intermediate section 3 on another prefabricated reinforced concrete intermediate section 3, and the connecting bolts 17 on the prefabricated reinforced concrete intermediate section 3 penetrate the connecting steel plate 18 in the adjacent reinforced concrete intermediate section The reserved through hole, and fixed with the nut backing plate and fastening nut;

(4) Put the prefabricated reinforced concrete top section 4 above the prefabricated reinforced concrete middle section 3, and fix the two by nuts,

(5) Place the cover beam 13 on the prefabricated reinforced concrete top segment 4, the pre-embedded top anchor bolts on the prefabricated reinforced concrete top segment 4 pass through the reserved through hole of the cover beam 13, and use the nut backing plate and tight Fixed nut;

(6) post-pouring concrete 20 to the junction after pouring concrete into the cavity to form the junction;

(7) Concrete is poured into the post-concrete cavity of the cover beam to form the post-concrete 15 of the cover beam, and the splicing of prefabricated steel pipe concrete and reinforced concrete piers is completed.

Example 3

In this embodiment, on the basis of Embodiment 1, the shear connector 16 is made as a steel plate with holes. The setting of the holes is beneficial to strengthen the connection between the shear connector 16 and the concrete, and improve the ability to work together and coordinate deformation. The steel plates with holes are welded parallel to the inner wall of the steel pipe and arranged at intervals on the inner wall of the steel pipe. Further, steel bars can be arranged in the through holes for better connection, and steel bars are penetrated in the through holes of the perforated steel plates at the same horizontal position along the inner circumference of the steel pipe to form a circle of steel bars around the inner wall or outer wall of the steel pipe. , steel bars can be welded in the through holes to further strengthen the connection between the steel pipe and the concrete.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or remodel it into an equivalent change. Example. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. a kind of Prefabricated concrete-filled steel tube and spiced by steel reinforced concrete bridge pier, it is characterised in that it includes pier footing, pre-manufactured steel Pipe concrete section, one or more prefabricated reinforced concrete interstitial segments and prefabricated reinforced concrete epimerite section, wherein, it is described Pier footing is fixedly connected with the Prefabricated concrete-filled steel tube section by means of the bottom crab-bolt set located at the pier footing, institute State in the middle of Prefabricated concrete-filled steel tube section and the prefabricated reinforced concrete interstitial segment and multiple prefabricated reinforced concretes Fixed and connected by means of connection unit between section, between prefabricated reinforced concrete interstitial segment and prefabricated reinforced concrete epimerite section Connect.

2. assembly bridge pier as claimed in claim 1, it is characterised in that the connection unit include multiple hollow connectors and The longitudinal reinforcement extended out of connector to the lower end of place prefabricated reinforced concrete interstitial segment, wherein, multiple connections Device upper side one-week interval of the prefabricated reinforced concrete interstitial segment along the Prefabricated concrete-filled steel tube section or each Set, the connector is embedded in respective concrete segment；The hollow connector includes open upper and lower side, and it is leaned on The side surface of nearly upper and lower side is provided with the injection nozzle crossed out on the outside of the section, and the injection nozzle is detachable setting, and With being connected inside the connector；

The longitudinal reinforcement is outside the position of the lower end correspondence connector of each prefabricated reinforced concrete interstitial segment In dew, the adjacent connector of the exposed longitudinal reinforcement correspondence insertion, the upper end of the longitudinal reinforcement is stretched into each correspondence At least a portion in the connector at end；

Anchor bolt is pushed up in the upper end of the prefabricated reinforced concrete epimerite section provided with pre-buried, the prefabricated reinforced concrete epimerite section The position of connector is provided with exposed longitudinal reinforcement in the lower end correspondence prefabricated reinforced concrete interstitial segment, described exposed Longitudinal reinforcement is inserted in corresponding connector, and the upper end of the longitudinal reinforcement is put down with prefabricated reinforced concrete top segments upper side OK.

3. assembly bridge pier as claimed in claim 2, it is characterised in that after the assembled bridge pier splicing, to the hollow company The injection nozzle injection grouting material of device lower end is connect, after the grouting material fills the hollow connector, is unloaded all described Injection nozzle, and it is tightly connected the injection port of the injection nozzle.

4. assembly bridge pier as claimed in claim 1, it is characterised in that the connection unit includes connecting bolt, junction steel plate With connection dowel, wherein, the connecting bolt is embedded in the Prefabricated concrete-filled steel tube section, the prefabricated reinforced concrete in advance Between section and the upper surface of prefabricated reinforced concrete epimerite section, the junction steel plate is fixed at the precast reinforced coagulation The lower end of native interstitial segment and prefabricated reinforced concrete epimerite section, the lower end of the connection dowel is fixedly connected on the company Connect in the middle of the upper surface of steel plate, the upper end of the connection dowel is bent downwardly；The correspondence connection spiral shell on the junction steel plate Bolt is provided with through hole, in the prefabricated reinforced concrete interstitial segment and the lower end correspondence institute of prefabricated reinforced concrete epimerite section The top of through hole is stated provided with the cavity for casting concrete.

5. assembly bridge pier as claimed in claim 1, it is characterised in that the assembled bridge pier also includes bent cap, the bent cap Located at the top of prefabricated reinforced concrete epimerite section, the two by being embedded in prefabricated reinforced concrete epimerite section top in advance Top anchor bolt connected with the preformed hole on the corresponding bent cap, in the top of the preformed hole provided with being used for casting concrete Cavity.

6. assembly bridge pier as claimed in claim 1, it is characterised in that the Prefabricated concrete-filled steel tube section is poured including centre There are the steel pipe, basic pading plate and multiple shear connectors of concrete, the shear connector is both secured to the steel pipe inner wall, The basic pading plate is located at the steel pipe bottom, and the area of the basic pading plate is more than the cross-sectional area of the steel pipe, And the correspondence bottom crab-bolt sets connecting hole on the basic pading plate outside the steel pipe main body projected area.

7. assembly bridge pier as claimed in claim 6, it is characterised in that the shear connector is peg, the peg Nail tip is welded on the steel pipe, the peg interlaced arrangement.

8. assembly bridge pier as claimed in claim 6, it is characterised in that the shear connector is steel plate with holes, the band Hole steel plate is the strip-form steel plate provided with multiple equally spaced vias, and the steel plate with holes is parallel to be fixed on the steel pipe inner wall.

9. assembly bridge pier as claimed in claim 1, it is characterised in that the prefabricated reinforced concrete interstitial segment and pre-manufactured steel Reinforced concrete epimerite section is provided with multiple longitudinal reinforcements, the concrete of multiple stirrups to be interior, wherein, multiple longitudinal reinforcements are close The concrete edge arranges that multiple stirrups are around the outside for being fixed on all longitudinal reinforcements, edge along one-week interval The longitudinal reinforcement is in longitudinally spaced arrangement.

10. assembly bridge pier as claimed in any one of claims 1-9 wherein, it is characterised in that the Prefabricated concrete-filled steel tube section Cross section with the prefabricated reinforced concrete interstitial segment and epimerite section is circular, square, oval or other shapes.