CN109989339B

CN109989339B - Prefabricated segment pier and application thereof in bridge construction

Info

Publication number: CN109989339B
Application number: CN201910367779.3A
Authority: CN
Inventors: 赵灿晖; 李志翔; 徐荣耀; 汪钺宸; 邓开来
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2020-01-07
Anticipated expiration: 2039-05-05
Also published as: CN109989339A

Abstract

The invention discloses a prefabricated segment pier and application thereof in bridge construction, wherein the prefabricated segment pier comprises a pier body and a sheath; the bridge pier body is a columnar piece, a steel inner container and a connecting piece are respectively arranged at two ends of the bridge pier body, the connecting piece comprises a connecting steel plate fixed at the end part of the bridge pier body and a PBL connecting cylinder penetrating through the connecting steel plate, a shear connecting hole is formed in the PBL connecting cylinder, a first perforating rib is inserted into the shear connecting hole at one end of the PBL connecting cylinder inserted into the bridge pier body, and a second perforating rib is arranged in the shear connecting hole at one end extending out of the bridge pier body; the side wall of the steel inner container is provided with a vertical wall hole, and the side wall of the pier body is provided with a mounting hole; the sheath includes two protecting sheathing boards, is provided with the fixed orifices of just opposition wall hole on the protecting sheathing board. The segmental pier can be quickly assembled at a low construction risk, and has the advantages of small initial defect, guaranteed bearing safety, high resource utilization rate, less environmental pollution, economy and durability.

Description

Prefabricated segment pier and application thereof in bridge construction

Technical Field

The invention belongs to the technical field of bridge engineering, and particularly relates to a prefabricated section pier and application thereof in bridge construction.

Background

With the development of economy and the progress of society, the requirement on the speed of building a highway-railway traffic network is higher and higher, the requirement on the aspect of environmental protection is tighter and tighter, and meanwhile, the aspects of safety, economy, construction risk controllability, durability and the like are also more and more emphasized. This is especially true when piers are used as a key ring for a large number of bridges in a road network.

The common bridge pier is bound with reinforcing steel bars, full of supports and templates on a construction site, then concrete is poured, and after the strength requirement is met, the bridge pier is constructed by removing the templates. The construction speed is low due to the requirements of working procedures and construction, and the reinforcing steel bars, the templates, the supports and a large amount of pouring concrete have great resource waste and environmental pollution. In view of this, the segment prefabricated assembled pier is produced at the same time, and the pier is divided into a plurality of segments, the pier segments are prefabricated in a factory, and the pier segments are connected into a whole by adopting a connection structure in a construction site to form the pier.

The existing segment prefabricated assembled bridge pier is roughly four in number:

a pore channel is reserved on a prefabricated pier segment, embedded steel bars penetrate into the pore channel on the site, cement grouting materials are poured into the reserved pore channel, the steel bars and the prefabricated segment are bonded together after the cement grouting materials are hardened, and the pier segment is connected into a whole through the steel bars. The structure is simple in arrangement and convenient and fast in construction, but the interfaces among the sections are weak;

and secondly, one end of the prefabricated pier segment protrudes or does not protrude, and the steel bars or (and) other connecting structures extend out of the end face. When in connection, the protruding section is inserted into a groove at the end part of another pier or a bearing platform, or a grouting sleeve is adopted, cement grouting materials are poured into the groove through a reserved grouting pipe or a grouting hole, the cement grouting materials are connected into a whole after being hardened, the communication of the steel bars among the prefabricated pier sections is realized, and the prefabricated sections are connected through the steel bars or (and) other connecting structures to form the pier. The structure is clearly stressed, and theoretically, the construction is simple and convenient. However, the concave-convex connection adopts a grouting pipe or a grouting hole to fill cement grouting materials, so that the pipe is easily blocked, the pouring is not solid, defects are generated, and the construction quality is difficult to guarantee. Meanwhile, when no other reinforcing measures exist, the interface of the new cement grouting material and the old cement grouting material is also a weak interface which exists initially, and unsafe behaviors such as cracking and the like are easy to occur under the load action. In addition, if a steel member penetrating through the precast pier segment is adopted, the steel consumption is large, and the manufacturing cost is high;

and thirdly, reserving a pore channel on the prefabricated pier segment, penetrating a prestressed steel beam into the pore channel on site, tensioning the prestressed steel beam, and connecting the pier segment into a whole through the prestress force generated by the steel beam and the prestressed steel beam to form the pier. The structure has good bearing capacity and simple structure, but is difficult to arrange and apply prestress under most conditions, the connection effect is difficult to ensure, and the construction risk is large.

And fourthly, one end of each prefabricated pier segment protrudes, the other end of each prefabricated pier segment is a groove, connecting holes are formed in the corresponding positions of the protruding segments and the groove segments, and the adjacent prefabricated pier segments are connected through connecting rods penetrating through the connecting holes of the protruding segments and the groove segments. The structure mode is simple and efficient, but the number of the connecting rods is large, a gap is unavoidably formed between the connecting rods and the connecting holes, the problem of durability exists, and the later maintenance cost is high.

Disclosure of Invention

In order to solve the problems, the invention provides a novel prefabricated segment pier which has the advantages of small initial defects, guaranteed bearing safety, high resource utilization rate, less environmental pollution, economy and durability and can be quickly assembled at low construction risk.

In order to achieve the purpose, the invention adopts the technical scheme that: the prefabricated segment pier comprises a pier body and a sheath; the bridge pier body is a columnar piece, a steel inner container is embedded at one end of the bridge pier body, a connecting piece is arranged at the other end of the bridge pier body, the connecting piece comprises a connecting steel plate and a PBL connecting cylinder, the connecting steel plate is fixed at the end part of the bridge pier body, a through hole with the same shape as the PBL connecting cylinder is formed in the middle of the connecting steel plate, the PBL connecting cylinder penetrates through the through hole and is welded with the connecting steel plate, a shear connecting hole is formed in the cylinder body of the connecting steel plate, a first perforation rib penetrates through the shear connecting hole at one end of the PBL connecting cylinder, a second perforation rib penetrates through the shear connecting hole at one end extending out of the outer part of the bridge pier body, the lengths of the first perforation rib and the second perforation rib penetrating through the shear connecting hole are not less than 300mm, and the ratio; the side wall of the steel inner container is provided with a vertical wall hole, the position of the vertical wall hole is based on that the vertical wall hole is just opposite to the shear connection hole after the PBL connecting cylinder is inserted into the steel inner container, and the side wall of the pier body is provided with a mounting hole at the position right opposite to the vertical wall hole; the sheath includes two protecting sheathing boards, and the protecting sheathing board can enclose the sleeve that synthetic and pier body shape are the same, and is provided with the fixed orifices just to the mounting hole on the protecting sheathing board.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the pier body (500) is a hollow or solid cement column, the whole pier body is round or square, a plurality of longitudinal reinforcing ribs are arranged in the pier body, one ends of the longitudinal reinforcing ribs penetrate out of bottom holes formed in the bottom of the steel inner container, and the other ends of the longitudinal reinforcing ribs penetrate out of reinforcing steel bar holes formed in the connecting steel plate; the length of the longitudinal reinforcing rib is equivalent to that of the pier body.

Furthermore, the PBL connecting cylinder is formed by enclosing four steel plates with the thickness not less than 12 mm.

Further, the inside reinforcing plate that is provided with of PBL connecting cylinder, the length of reinforcing plate is the same with the length of PBL connecting cylinder.

Furthermore, the shear connection holes penetrate through the PBL connection barrel, two pairs of the PBL connection barrel are used as one group, eight groups of the PBL connection barrel are arranged in total and are evenly distributed on two sides of the connection steel plate, and the distance between the two pairs of the shear connection holes in each group is larger than or equal to ten times of the diameter of the first perforation rib or the second perforation rib and smaller than or equal to 500 mm.

Furthermore, the shear connection holes are arranged on the PBL connection barrel in a staggered layer.

Furthermore, the edge of the top of the steel inner container is provided with a connecting flange.

Further, the both ends of sheathing board are provided with pulls the limit, pull and be provided with the screw hole on the limit, and the threaded hole is equipped with the bolt.

The invention has the beneficial effects that:

1. the PBL connecting cylinder has the advantages of high bearing capacity, high rigidity, good ductility and good fatigue resistance.

2. The prefabricated section pier has good connection compactness, can obviously reduce the initial pouring defect, has no weak interface after connection, does not crack, and can ensure the construction quality.

3. The prefabricated section pier takes the cylindrical PBL as a main stress connecting component, and is simple to assemble on a construction site, good in connecting effect and low in construction risk. In addition, a certain number of steel structures are adopted only in the connecting section, the split and assembled steel sheath can be recycled, the actual steel consumption is greatly reduced, and the cost is effectively reduced.

4. The segmental pier stud and the capping beam are prefabricated in a factory, only a small number of segmental connecting operations are performed on the site, the prefabricated and assembled degree is high, and the workload of a construction site is small.

5. The interference of construction environment is small, the construction period is shortened, and the comprehensive construction cost is reduced. The prefabrication work of the pier stud is finished in a factory and is not influenced by the construction environment; the construction of the pier foundation and the bearing platform and the prefabrication of the pier column and the capping beam can be carried out in parallel, so that the construction speed is accelerated.

6. The occupied space is small. Only the bearing platform is cast in place, and the pier body sections are prefabricated in a factory, so that a template for casting the pier body and the cover beam is not needed to be erected, and the area of a construction site is reduced.

Drawings

Fig. 1 is a perspective view of a pier body;

FIG. 2 is a perspective view of the interior of the pier body;

FIG. 3 is a perspective view of the connector;

FIG. 4 is a perspective view of the connecting steel plate;

FIG. 5 is a perspective view of a PBL connector barrel;

FIG. 6 is a perspective view of the steel inner container;

FIG. 7 is a perspective view of the sheath;

FIG. 8 is a schematic connection diagram after the pier is built and the sheath is removed;

fig. 9 is a schematic view of two pier bodies connected to each other;

wherein, 100, PBL connecting cylinder; 101. a steel plate; 102. connecting a shear force hole; 103. a first perforation rib; 104. a second perforated rib; 200. connecting steel plates; 201. a through hole; 202. reinforcing steel bar holes; 300. a steel inner container; 301. connecting the flanging; 302. a vertical wall hole; 303. a bottom hole; 400. a sheath; 401. sheathing board; 402. a fixing hole; 500. a pier body; 501. mounting holes; 600. and (5) longitudinal reinforcing ribs.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings.

In an embodiment of the present invention, as shown in fig. 1 to 9, there is provided a prefabricated segment pier including a pier body 500 and a sheath 400. The pier body 500 is a hollow or solid cement column, the whole shape is round or square, and the specification of the pier body can be properly adjusted according to the construction requirement; in order to increase the supporting strength of the pier body, a plurality of longitudinal reinforcing ribs 600 are arranged inside the pier body 500, and the length of each longitudinal reinforcing rib 600 is the same as that of the pier body 500.

One end of the pier body 500 is provided with the steel liner 300, the steel liner 300 is integrally barrel-shaped, the cross section of the steel liner 300 is the same as that of the pier body 500, the wall thickness of the steel liner 300 is 12-20 mm, the size of the steel liner 300 is smaller than that of the pier body 500, the steel liner 300 is installed at the end of the pier body 500 in an embedded mode, a vertical wall hole 302 is formed in the side wall of the steel liner 300, and a mounting hole 501 is formed in the position, opposite to the vertical wall hole 302, of the side wall of the pier body 500; the bottom of the steel inner container 300 is provided with bottom holes 303 with the same number as the longitudinal reinforcing ribs 600, and the longitudinal reinforcing ribs 600 penetrate through the bottom holes 303 and are flush with the top of the steel inner container 300. In addition, in order to facilitate the connection of the pier body 500, a connection flange 301 is arranged at the top edge of the steel liner 300, and the edge of the flange 301 is just flush with the pier body 500.

The other end of the pier body 500 is provided with a connector, the connector comprises a connecting steel plate 200 and a PBL connector 100, the shape and the size of the connecting steel plate 200 are the same as those of the section of the pier body 500, the edge of the connecting steel plate is provided with a reinforcing steel bar hole 202 through which the longitudinal reinforcing steel bar 600 penetrates, and the connecting steel plate 200 is fixed at the end of the pier body 500 through the longitudinal reinforcing steel bar 600 and a cement pouring mode. As shown in fig. 4, a through hole 201 having the same shape as the PBL connector barrel 100 is formed in the middle of the connection steel plate 200, the PBL connector barrel 100 passes through the through hole 201, the positions of the connection steel plate 200 and the PBL connector barrel 100 are adjusted to make the connection steel plate 200 located in the middle of the PBL connector barrel 100, and the connection steel plate 200 and the PBL connector barrel 100 are welded together to form a connector as a whole, as shown in fig. 3. The PBL connector barrel 100 has shear connection holes 102 formed in the barrel body, as shown in fig. 5, the shear connection holes 102 penetrate through the PBL connector barrel 100, and two pairs of the shear connection holes 102 form a group. The PBL connecting cylinder 100 is inserted into a shear connecting hole 102 at one end inside the pier body 500 and is inserted with a first perforation rib 103 in a penetrating manner, the length of the first perforation rib 103 is smaller than the section size of the pier body 500, and the length of the first perforation rib penetrating out of the shear connecting hole is not smaller than 300 mm; the shear connection hole 102 of the PBL connection cylinder 100 extending out of the exterior of the pier body 500 is provided with a second perforation rib 104, and the length of the second perforation rib 104 is equal to the cross-sectional dimension of the pier body 500. The position of the shear connection hole 102 on the PBL connector barrel 100 is based on the fact that the PBL connector barrel 100 can be aligned with the vertical wall hole 302 and the installation hole 501 after being inserted into the steel liner 300.

The PBL connector barrel 100 of the present invention may have a square or circular shape, and in order to increase the connection stability of the PBL connector barrel 100, a reinforcing plate may be provided inside the PBL connector barrel 100, and the reinforcing plate may be cross-welded inside the PBL connector barrel 100. In a preferred embodiment of the present invention, as shown in fig. 5, the PBL connector barrel 100 is formed by enclosing four steel plates 101 with a thickness not less than 12mm, and is square as a whole, and a cross-shaped reinforcing plate is disposed inside the square PBL connector barrel 100, and the length of the reinforcing plate is the same as that of the PBL connector barrel 100.

In another preferred embodiment of the present invention, eight groups of shear connection holes 102 are arranged on the cylinder body of the PBL connector barrel 100, and are symmetrically distributed on two sides of the connection steel plate 200, and the distance between two pairs of shear connection holes 102 in each group is equal to ten times the diameter of the first perforation rib 103 or the second perforation rib 104; in order to facilitate installation and not influence the bearing capacity of the prefabricated section pier, the ratio of the aperture of the shear connection hole 102 to the diameter of the first perforated rib 103 or the second perforated rib 104 is 3: 1. In addition, in order to improve the connection effect, the shear connection holes 102 are arranged on the PBL connection barrel 100 in a staggered manner, and the staggered manner means that: one set of shear connection holes 102 is provided on the front and rear steel plates of the PBL connector barrel 100, and then the other set of shear connection holes 102 is provided on the left and right steel plates of the PBL connector barrel 100, and the two sets of shear connection holes 102 are not on the same horizontal plane, as shown in fig. 5.

The sheath 400 comprises two sheath plates 401, and the two sheath plates 401 can be enclosed into a sleeve with the same shape as the pier body 500. Be provided with the fixed orifices 402 just opposing the wall hole on the sheathing board 401, the both ends of sheathing board 401 are provided with pull the limit, pull and are provided with the screw hole on the limit, are equipped with the bolt in the screw hole.

The preparation method of the pier body 500 comprises the following steps:

s1, assembling the connecting pieces according to the mode shown in the figure 2, respectively placing the connecting pieces and the steel inner container 300 at two ends of the pier body 500, and enabling the connecting steel plates 200 and the connecting flanges 301 at the top of the steel inner container 300 to be just exposed out of the end face of the pier body 500; then, penetrating the longitudinal reinforcing ribs 600 in the pier body 500 out of the reinforcing steel bar holes 202 on the connecting steel plates 200 and the bottom holes 303 on the steel liner 300;

s2, reserving an installation hole 501 which has the same size as the shear connection hole 102 and penetrates through the vertical wall of the pier body 500 at the position corresponding to the vertical wall hole 302 of the pier body 500 and the steel liner 300;

and S3, binding steel bars in the pier body 500, erecting a template, and pouring concrete to complete the construction of the pier body 500.

The assembly mode of the prefabricated section pier comprises the following steps:

s1, when the pier body 500 is erected, the end of the steel liner 300 is positioned at the upper part, and at the moment, the outer surface of the section of the pier steel liner 300 is wrapped with a sheath 400, so that the fixing hole 402 of the sheath 400 is aligned with the mounting hole 501 of the pier body 500;

s2, filling the steel inner container 300 with concrete, then quickly inserting the PBL connecting cylinder 100 and the longitudinal reinforcing rib 600 exposed out of the other pier body 500, and quickly adjusting and aligning to the marked splicing position; the assembly position marking is that the PBL connecting cylinder 100 exposed out of one pier body 500 and the longitudinal reinforcing ribs 600 are placed into the steel liner 300 of the other pier body 500, so that the shear connecting holes 102 of the PBL connecting cylinder 100 are completely aligned with the vertical wall holes 302 of the steel liner 300 and the mounting holes 501 of the pier bodies 500, the two pier bodies 500 are marked, and if the marks can be overlapped, the corresponding holes are aligned;

s3, the second perforation ribs 104 penetrate through the fixing holes 402 of the sheath 400, sequentially pass through the mounting holes 501 of the pier body 500, the vertical wall holes 302 of the steel liner 300 and the shear connection holes 102 of the PBL connecting cylinder 100, and then penetrate out through the vertical wall holes 302 of the opposite side steel liner 300, the mounting holes 501 of the pier body 500 and the fixing holes 402 of the sheath 400;

s4, after the concrete reaches a certain strength, the sheath 400 is removed;

and S5, welding the connecting steel plate 200 and the connecting flanging 301 at the top of the steel inner container 300 together along the annular direction of the pier to complete the assembly of the prefabricated section pier.

While the present invention has been described in detail with reference to the illustrated embodiments, it should not be construed as limited to the scope of the present patent. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims

1. The utility model provides a prefabricated segment pier which characterized in that: comprises a pier body (500) and a sheath (400); the bridge pier body (500) is a columnar piece, one end of the bridge pier body is embedded with a steel inner container (300), the other end of the bridge pier body is provided with a connecting piece, the connecting piece comprises a connecting steel plate (200) and a PBL connecting cylinder (100), the connecting steel plate (200) is fixed at the end part of the bridge pier body (500), the middle part of the connecting steel plate is provided with a through hole (201) which is the same as the PBL connecting cylinder (100) in shape, the PBL connecting cylinder (100) penetrates through the through hole (201) and is welded with the connecting steel plate (200), the cylinder body of the connecting steel plate is provided with a shear connecting hole (102), the PBL connecting cylinder (100) penetrates into the shear connecting hole (102) at one end inside the bridge pier body (500) to be inserted with a first perforation rib (103), the shear connecting hole (102) extending out of one end outside the bridge pier body (500) is provided with a second perforation rib (104), and the lengths of the first perforation rib (103), the ratio of the aperture of the shear connection hole (102) to the diameter of the first perforated rib (103) or the second perforated rib (104) is 3: 1; a vertical wall hole (302) is formed in the side wall of the steel inner container (300), and a mounting hole (501) is formed in the position, opposite to the vertical wall hole (302), of the side wall of the pier body (500); the sheath (400) comprises two sheath plates (401), the sheath plates (401) can enclose a sleeve which is the same as the pier body (500) in shape, and the sheath plates (401) are provided with fixing holes (402) opposite to the mounting holes (501).

2. The precast segment pier of claim 1, wherein: the pier body (500) is a hollow or solid cement column, is round or square as a whole, is internally provided with a plurality of longitudinal reinforcing ribs (600), one ends of the longitudinal reinforcing ribs (600) penetrate out of bottom holes (303) arranged at the bottom of the steel inner container (300), and the other ends of the longitudinal reinforcing ribs penetrate out of reinforcing steel bar holes (202) arranged on the connecting steel plates (200); the length of the longitudinal reinforcing rib (600) is equivalent to that of the pier body (500).

3. The precast segment pier of claim 1, wherein: the PBL connecting cylinder (100) is formed by enclosing four steel plates (101) with the thickness not less than 12 mm.

4. The precast segment pier of claim 3, wherein: the PBL connecting barrel (100) is internally provided with a reinforcing plate, and the length of the reinforcing plate is the same as that of the PBL connecting barrel (100).

5. The precast segment pier of claim 1, wherein: the shear connection holes (102) penetrate through the PBL connection barrel (100), two pairs of the shear connection holes are used as one group, eight groups of the shear connection holes are arranged in total and are evenly distributed on two sides of the connection steel plate (200), and the distance between the two pairs of the shear connection holes (102) in each group is larger than or equal to ten times of the diameter of the first perforation rib (103) or the second perforation rib (104) and is smaller than or equal to 500 mm.

6. The precast segment pier of claim 5, wherein: the shear connection holes (102) are arranged on the PBL connection barrel (100) in a staggered mode.

7. The precast segment pier of claim 1, wherein: the edge of the top of the steel inner container (300) is provided with a connecting flange (301).

8. The precast segment pier of claim 1, wherein: both ends of the sheathing board (401) are provided with pull edges, the pull edges are provided with threaded holes, and the threaded holes are internally provided with bolts.

9. Use of a prefabricated segment pier according to any one of claims 1 to 8 in bridge construction.