CN109989339B - A prefabricated segmental pier and its application in bridge construction - Google Patents

Abstract

The invention discloses a prefabricated section bridge pier and its application in bridge construction. The prefabricated section bridge pier includes a bridge pier body and a sheath; The parts include a connecting steel plate fixed at the end of the pier body and a PBL connecting cylinder passing through the connecting steel plate. The PBL connecting cylinder is provided with a shear connection hole, and the PBL connecting cylinder is inserted into the shear connection hole at one end of the pier body. A perforated rib, the shear connection hole extending out of the outer end of the pier body is equipped with a second perforated rib; the side wall of the steel inner tank 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 pieces The sheath plate is provided with a fixing hole opposite to the vertical wall hole. The segmental bridge pier in the present invention can be quickly assembled with low construction risk, and has small initial defects, guaranteed bearing safety, high resource utilization rate, less environmental pollution, and economical durability.

Description

A prefabricated segmental pier and its application in bridge construction

technical field

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

Background technique

With the development of the economy and the progress of the society, the requirements for the construction speed of the highway and railway transportation network are getting higher and higher, and the requirements for environmental protection are getting stricter. At the same time, the safety, economy, construction risk controllability, durability Sex and other aspects are also becoming more and more important. Bridge piers are a key part of a large number of bridges in the road network, even more so.

The usual bridge piers are bound with steel bars, covered with supports and formwork at the construction site, and then concrete is poured. After reaching the strength requirements, the formwork is removed and built. Due to the process and construction requirements, the construction speed is relatively slow, and there is a large waste of resources and environmental pollution in steel bars, formwork, brackets and a large amount of poured concrete. In view of this, segmental prefabricated piers came into being, which divided the piers into several segments, the pier segments were prefabricated in the factory, and the pier segments were connected as a whole by using a connection structure at the construction site to become a bridge pier.

There are roughly four types of existing segmental prefabricated piers:

1. Reserve holes on the prefabricated pier segments, insert the pre-embedded steel bars into the holes on site, and pour cement grouting material into the reserved holes. After the cement grouting material hardens, the steel bars and the prefabricated sections are bonded together. Reinforcing bars connect the pier segments as a whole. This kind of structure is simple in layout and convenient in construction, but the interface between segments is relatively weak;

2. One end of the prefabricated pier segment protrudes or does not protrude, and the steel bars or (and) other connecting structures protrude from the end face. When connecting, insert the protruding section into the groove at the end of another bridge pier or cap, or use a grouting sleeve, and pour the cement grouting material through the reserved grouting pipe or grouting hole. The connection of the steel bars between the segments of the prefabricated piers is to connect the prefabricated segments through the steel bars or (and) other connection structures to form the bridge piers. This structure has a clear force and is theoretically easy to construct. However, the concave-convex connection is easy to block the pipe when the cement grouting material is poured into the grouting pipe or the grouting hole, resulting in the pouring is not solid, resulting in defects, and the construction quality is difficult to guarantee. At the same time, when there are no other strengthening measures, the interface between the old and new cement grouting materials is also a weak interface that exists at the beginning, and unsafe behaviors such as cracking are prone to occur when the load is applied. In addition, if the steel members running through the prefabricated pier segments are used, the amount of steel used will be large and the cost will be high;

3. Reserve holes on the prefabricated pier segments, insert the prestressed steel bundles into the tunnels on site, stretch the prestressed steel bundles, and connect the pier segments as a whole through the prestressed and prestressed steel bundles generated by the steel bundles. form bridge piers. This kind of structure has good bearing capacity and relatively simple structure, but in most cases it is difficult to arrange and apply prestress, the connection effect is difficult to guarantee, and the construction risk is high.

4. One end of the prefabricated pier segment is protruding and the other end is a groove. There are connecting holes at the corresponding positions of the convex and groove segments. The adjacent prefabricated piers are connected to the adjacent prefabricated piers through the connecting rods passing through the connecting holes of the convex and groove segments. Segment connection. This construction method is simple and efficient, but there are many connecting rods, and there is inevitably a gap between the connecting rod and the connecting hole, which has durability problems and high maintenance costs in the later period.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention proposes a new type of prefabricated segmental bridge pier with small initial defects, guaranteed bearing safety, high resource utilization rate, less environmental pollution, economical durability, and rapid assembly with low construction risk.

In order to achieve the above purpose, the technical solution adopted in the present invention is to provide a prefabricated segmental bridge pier, including a bridge pier body and a sheath; The connecting piece includes a connecting steel plate and a PBL connecting cylinder. The connecting steel plate is fixed at the end of the pier body, and a through hole with the same shape as the PBL connecting cylinder is opened in the middle. The PBL connecting cylinder passes through the through hole and is welded with the connecting steel plate. , the body of the cylinder is provided with a shear connection hole, the PBL connection cylinder is inserted into the shear connection hole at the inner end of the pier body, and a first perforated rib is inserted, and the shear connection hole at the outer end of the pier body is inserted with a second perforated rib. , the length of the first perforated rib and the second perforated rib passing through the shear connection hole is not less than 300mm, and the ratio of the diameter of the shear connection hole to the diameter of the first perforated rib or the second perforated rib is 3:1; A vertical wall hole is opened on the side wall of the inner tank. The position of the vertical wall hole is based on the position of the vertical wall hole facing the shear force connection hole after the PBL connecting cylinder is inserted into the steel inner tank. Mounting holes; the sheath includes two sheathing plates, the sheathing plates can enclose a sleeve with the same shape as the pier body, and the sheathing plate is provided with fixing holes facing the mounting holes.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, the pier body (500) is a hollow or solid cement column, which is round or square as a whole, and is provided with a number of longitudinal reinforcement ribs. One end is pierced through the reinforcement hole set on the connecting steel plate; the length of the longitudinal reinforcement is equal to the length of the pier body.

Further, the PBL connecting cylinder is enclosed by four steel plates with a thickness of not less than 12mm.

Further, a reinforcing plate is arranged inside the PBL connecting tube, and the length of the reinforcing plate is the same as that of the PBL connecting tube.

Further, the shear connection holes run through the PBL connection cylinder, which are two pairs as a group, and there are eight groups in total, which are evenly distributed on both sides of the connecting steel plates, and the distance between the two pairs of shear connection holes in each group is greater than It is equal to ten times the diameter of the first perforated rib or the second perforated rib, and is less than or equal to 500mm.

Further, the shear connection holes are cross-staggered and arranged on the PBL connection cylinder.

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

Further, the two ends of the sheath plate are provided with a rib, the rib is provided with a threaded hole, and the threaded hole is equipped with a bolt.

The beneficial effects of the present invention are:

1. The PBL connecting cylinder in the present invention has high bearing capacity, high rigidity, good ductility and good fatigue resistance.

2. Using the prefabricated segmental piers in the present invention, the connection compactness is good, the initial pouring defects can be significantly reduced, and there is no weak interface after the connection, no cracking problem occurs, and the construction quality can be guaranteed.

3. The prefabricated segmental pier in the present invention uses the cylindrical PBL as the main force-bearing connecting member, which is easy to assemble on the construction site, has a good connection effect, and has low construction risk. Moreover, the present invention only adopts a certain number of steel structures in the connecting section, and the separated and assembled steel sheath can be reused, the actual steel consumption is greatly reduced, and the cost is effectively reduced.

4. The segmental piers and cover beams are prefabricated in the factory. There are only a few segmental connection operations on site. The degree of prefabrication and assembly is high, and the workload on the construction site is small.

5. Less interference from the construction environment, shorten the construction period and reduce the comprehensive construction cost. The prefabrication of the piers and columns is done in the factory and is not affected by the construction environment; the construction of the pier foundation, the cap and the prefabrication of the piers, columns and cover beams can be performed in parallel to speed up the construction.

6. Occupies a small space. Only the cap is poured on site, and the pier body segments are prefabricated in the factory, so there is no need to set up the formwork for pouring the pier body and the cover beam, which reduces the area of the construction site.

Description of drawings

Figure 1 is a perspective view of a bridge pier body;

Figure 2 is a perspective view of the interior of the pier body;

Figure 3 is a perspective view of the connector;

Figure 4 is a perspective view of connecting steel plates;

Fig. 5 is the perspective view of PBL connecting cylinder;

Figure 6 is a three-dimensional view of a steel liner;

Figure 7 is a perspective view of the sheath;

Figure 8 is a schematic diagram of the connection after the construction of the bridge pier is completed and the sheath is removed;

Fig. 9 is the schematic diagram when two bridge pier bodies are connected to each other;

Among them, 100, PBL connecting cylinder; 101, steel plate; 102, shear connection hole; 103, first perforated rib; 104, second perforated rib; 200, connecting steel plate; 201, through hole; 202, reinforcement hole; 300, Steel liner; 301, connecting flange; 302, vertical wall hole; 303, bottom hole; 400, sheath; 401, sheath plate; 402, fixing hole; 500, pier body; 501, mounting hole; 600, longitudinal Ribs.

Detailed ways

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In an embodiment of the present invention, as shown in FIGS. 1 to 9 , a prefabricated segmental pier is provided, and the prefabricated segmental pier includes a pier body 500 and a sheath 400 . Among them, the pier body 500 is a hollow or solid cement column, the overall shape is a circle or a square, etc., and its specifications can be appropriately adjusted according to construction requirements; in order to increase the support strength of the pier body, a number of longitudinal reinforcing bars are arranged inside the pier body 500 600, the length of the longitudinal reinforcement 600 is the same as the length of the pier body 500.

One end of the pier body 500 is installed with a steel inner liner 300. The steel inner liner 300 is in the shape of a barrel as a whole, and its cross-sectional shape is the same as that of the pier body 500. The wall thickness of the steel inner liner 300 is 12-20 mm, and its size The size of the pier body 500 is smaller than the size of the pier body 500 , the steel inner liner 300 is installed on the end of the pier body 500 in an embedded form, the vertical wall hole 302 is opened on the side wall of the steel inner liner 300 , and the side wall of the pier body 500 is facing the vertical wall. The position of the hole 302 is provided with a mounting hole 501; the bottom of the steel liner 300 is provided with bottom holes 303 with the same number as the longitudinal reinforcing ribs 600, and the longitudinal reinforcing ribs 600 pass through the bottom hole 303 and are connected with the steel liner 300. the top remains flush. In addition, in order to facilitate the connection of the pier body 500 , a connecting flange 301 is provided on the top edge of the steel inner pot 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 connecting piece. The connecting piece includes a connecting steel plate 200 and a PBL connecting cylinder 100. The shape and size of the connecting steel plate 200 are the same as the shape and size of the cross-section of the pier body 500, and its edge is provided with longitudinal reinforcing ribs 600. The pierced reinforcement holes 202 and the connecting steel plate 200 are fixed to the end of the pier body 500 by means of longitudinal reinforcing ribs 600 and cement casting. As shown in FIG. 4 , a through hole 201 having the same shape as the PBL connecting cylinder 100 is opened in the middle of the connecting steel plate 200 , the PBL connecting cylinder 100 passes through the through hole 201 , and the positions of the two are adjusted so that the connecting steel plate 200 is located in the PBL connection. The middle part of the cylinder 100 is welded, and the connecting steel plate 200 and the PBL connecting cylinder 100 are welded together to form the whole connecting piece, as shown in FIG. 3 . Shear connection holes 102 are formed on the body of the PBL connection cylinder 100 . As shown in FIG. 5 , the shear connection holes 102 penetrate through the PBL connection cylinder 100 , and two pairs of the shear connection holes 102 form a group. The PBL connecting cylinder 100 is inserted into the shear connection hole 102 at one end of the inner end of the pier body 500, and a first perforated rib 103 is inserted. Less than 300mm; the shear connection hole 102 of the PBL connecting cylinder 100 extending from the outer end of the pier body 500 is equipped with a second perforated rib 104 , and the length of the second perforated rib 104 is equal to the cross-sectional dimension of the pier body 500 . The position of the shear force connecting hole 102 on the PBL connecting cylinder 100 is based on the fact that the PBL connecting cylinder 100 can be directly opposite the vertical wall hole 302 and the mounting hole 501 after the PBL connecting cylinder 100 is inserted into the steel inner container 300 .

The PBL connecting cylinder 100 in the present invention can be square or circular, and in order to increase the connection stability of the PBL connecting cylinder 100, a reinforcing plate can also be arranged inside the PBL connecting cylinder 100, and the reinforcing plate is cross-welded on the PBL connecting cylinder 100. internal. In a preferred embodiment of the present invention, as shown in FIG. 5 , the PBL connecting cylinder 100 is enclosed by four steel plates 101 with a thickness of not less than 12 mm, and the overall shape is square. The interior of the square PBL connecting cylinder 100 is provided with A cross-shaped reinforcing plate, the length of the reinforcing plate is the same as the length of the PBL connection cylinder 100 .

In another preferred embodiment of the present invention, there are eight groups of shear connection holes 102 on the barrel of the PBL connection barrel 100, which are symmetrically distributed on both sides of the connecting steel plate 200, and there are two pairs of shear connection holes in each group. The distance between 102 is equal to ten times the diameter of the first perforated rib 103 or the second perforated rib 104; in order to facilitate installation without affecting the bearing capacity of the prefabricated segment pier, the diameter of the shear connection hole 102 in the present invention is the same as The ratio of the diameters of the first perforated ribs 103 or the second perforated ribs 104 is 3:1. In addition, in order to improve the connection effect, the shear connection holes 102 are arranged on the PBL connection cylinder 100 in cross-staggered layers. Then, another group of shear connection holes 102 are arranged on the left and right steel plates of the PBL connection cylinder 100 , and the two groups of shear connection holes 102 are not on the same level, as shown in FIG. 5 .

The sheath 400 in the present invention includes two sheath plates 401 , and the two sheath plates 401 can be enclosed to form a sleeve with the same shape as the pier body 500 . The sheathing plate 401 is provided with a fixing hole 402 facing the vertical wall hole, the two ends of the sheathing plate 401 are provided with a rib, the rib is provided with a threaded hole, and the threaded hole is equipped with a bolt.

The preparation method of the bridge pier body 500 in the present invention is as follows:

S1: Assemble the connector as shown in FIG. 2, place the connector and the steel inner pot 300 on both ends of the pier body 500, respectively, and make the connection flange 301 between the connecting steel plate 200 and the top of the steel inner pot 300 Just exposed on the end face of the pier body 500; then the longitudinal reinforcement 600 in the pier body 500 is passed through the reinforcing bar hole 202 on the connecting steel plate 200 and the bottom hole 303 on the steel liner 300;

S2: at the position corresponding to the vertical wall hole 302 of the pier body 500 and the steel liner 300, set aside a mounting hole 501 having the same size as the shear connection hole 102 and penetrating the vertical wall of the corresponding pier body 500;

S3: Bind the steel bars in the pier body 500, set up the formwork, pour concrete, and complete the construction of the pier body 500.

The assembling method of the prefabricated segment pier in the present invention is as follows:

S1: When the pier body 500 is erected, the end of the steel inner liner 300 is located at the upper part. At this time, the sheath 400 is wrapped on the outer surface of the section of the pier steel inner liner 300, so that the fixing holes 402 of the jacket 400 and the mounting holes 501 of the pier body 500 are connected. align;

S2: Fill the steel liner 300 with concrete, and then quickly insert the exposed PBL connecting cylinder 100 and the longitudinal reinforcing rib 600 of the other pier body 500, and quickly adjust and align to the marked assembly position; The exposed PBL connecting cylinder 100 and longitudinal reinforcing bars 600 of the pier body 500 are put into the steel inner liner 300 of the other pier body 500 , so that the shear connection hole 102 of the PBL connecting cylinder 100 is the same as the vertical wall hole 302 of the steel inner liner 300 . It is completely aligned with the mounting holes 501 of the pier body 500, and marks are made on the two pier bodies 500. If the marks can overlap, it indicates that the corresponding holes have been aligned;

S3: Pass the second perforated rib 104 through the fixing hole 402 of the sheath 400, and pass through the mounting hole 501 of the pier body 500, the vertical wall hole 302 of the steel liner 300, and the shear force connection hole of the PBL connection cylinder 100 in turn 102, and then pass through the vertical wall hole 302 of the opposite side steel liner 300, the mounting hole 501 of the pier body 500 and the fixing hole 402 of the sheath 400;

S4: after the concrete reaches a certain strength, remove the sheath 400;

S5: Weld the connecting steel plate 200 and the connecting flange 301 on the top of the steel inner liner 300 along the circumferential direction of the pier to complete the assembly of the prefabricated segment pier.

Although the specific embodiments of the present invention have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the protection scope of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative efforts still belong to the protection scope of this patent.

Claims (9)

1. A prefabricated segmental bridge pier, characterized in that: it comprises a bridge pier body (500) and a sheath (400); the bridge pier body (500) is a columnar part, one end of which is embedded with a steel inner bladder (300), The other end is provided with a connecting piece, the connecting piece includes a connecting steel plate (200) and a PBL connecting cylinder (100), the connecting steel plate (200) is fixed on the end of the bridge pier body (500), and a connecting piece is opened in the middle of the bridge pier body (500). The PBL connecting cylinder (100) has a through hole (201) with the same shape, the PBL connecting cylinder (100) passes through the through hole (201) and is welded with the connecting steel plate (200), and the cylinder body is provided with a shear force A connecting hole (102), wherein the PBL connecting cylinder (100) is inserted into the shearing connecting hole (102) at one end of the inner end of the pier body (500), and a first perforated rib (103) is inserted through it, and protrudes from the outer end of the pier body (500) The shear connection hole (102) is equipped with a second perforated rib (104), and the length of the first perforated rib (103) and the second perforated rib (104) passing through the shear connection hole (102) is not less than 300mm, And the ratio of the diameter 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), a mounting hole (501) is provided on the side wall of the bridge pier body (500) at a position facing the vertical wall hole (302); the sheath (400) includes two sheath plates ( 401), the sheathing plate (401) can be enclosed into a sleeve with the same shape as the pier body (500), and the sheathing plate (401) is provided with a fixing hole (402) facing the mounting hole (501). ). 2. The prefabricated segmental bridge pier according to claim 1, characterized in that: the pier body (500) is a hollow or solid cement column, in the shape of a circle or a square as a whole, and a number of longitudinal reinforcing ribs (600) are arranged inside the pier body (500). ), one end of the longitudinal reinforcing rib (600) protrudes from the bottom hole (303) provided at the bottom of the steel inner container (300), and the other end is provided from the reinforcing steel hole provided on the connecting steel plate (200) The length of the longitudinal reinforcing rib (600) is equivalent to the length of the bridge pier body (500). 3. The prefabricated segment bridge pier according to claim 1, wherein the PBL connecting cylinder (100) is enclosed by four steel plates (101) with a thickness of not less than 12 mm. 4. The prefabricated segmental bridge pier according to claim 3, characterized in that: a reinforcing plate is arranged inside the PBL connecting cylinder (100), and the length of the reinforcing plate is the same as the length of the PBL connecting cylinder (100). . 5. The prefabricated segment bridge pier according to claim 1, characterized in that: the shear force connecting hole (102) penetrates the PBL connecting cylinder (100), two pairs are formed as a group, and there are eight groups in total. , evenly distributed on both sides of the connecting steel plate (200), and the distance between the two pairs of shear connecting holes (102) in each group is greater than or equal to ten times the first perforated rib (103) or the second perforated rib ( 104), less than or equal to 500mm. 6. The prefabricated segment bridge pier according to claim 5, characterized in that: the shear connection holes (102) are arranged on the PBL connection cylinder (100) in a cross-staggered manner. 7. The prefabricated segment bridge pier according to claim 1, wherein a connecting flange (301) is provided on the top edge of the steel inner bladder (300). 8. The prefabricated segment bridge pier according to claim 1, characterized in that: both ends of the sheathing plate (401) are provided with a rib, the rib is provided with a threaded hole, and the threaded hole is equipped with There are bolts. 9. The application of the prefabricated segmental pier according to any one of claims 1 to 8 in bridge construction.

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