CN110565510A - Prefabricated assembled segmental pier structure and construction method thereof - Google Patents

Abstract

The present invention provides a prefabricated assembled segmental bridge pier structure and construction method. The present invention realizes the standardization, factoryization and assembly of the construction process by prefabricating the upper and lower section prefabricated bridge piers and other auxiliary components in the factory; The pier is prefabricated in sections, realizing the large-scale prefabricated construction, which can meet the rapid construction requirements of high-pier bridges, greatly shorten the construction period, improve the quality of the project, and reduce the adverse impact on urban traffic and the environment during the construction process ; There is a reserved slot for the cap on the cast-in-place cap, which is convenient for positioning when hoisting the lower prefabricated pier; the lower pier groove is set on the lower prefabricated pier, and the upper pier convex line is set on the upper prefabricated pier. The two form a mortise-and-tenon structure, which is convenient for accurate positioning during hoisting, greatly reduces construction difficulty, greatly improves construction efficiency, and shortens the construction period.

Description

Prefabricated assembled segmental pier structure and its construction method

technical field

The invention belongs to the field of bridge engineering, and in particular relates to a prefabricated assembled segmental pier structure and a construction method.

Background technique

With the rapid development of China's economy and society, the traffic volume in cities has become increasingly heavy. Due to the long age of concrete and other reasons, the traditional method of constructing bridges such as cast-in-place brackets has led to a long construction period, which has seriously affected urban traffic. The prefabricated bridge can minimize the interference to the existing traffic, greatly increase the construction safety, reduce the pollution to the construction site environment, significantly speed up the construction progress, and provide a great solution for the maintenance and replacement of the bridge components in the later period. Great convenience. The prefabrication and assembly technology of domestic bridge superstructure and bridge deck structure has become mature, while the prefabrication and assembly technology of bridge substructure, especially the higher piers, is less, and it is only used in gravity piers of some sea-crossing bridges.

At present, some urban bridges have begun to be constructed in the way of factory prefabrication and on-site hoisting. However, most of this construction method is only for the overall pier. Because the size of the pier is limited by the means of transportation and hoisting machinery, some high pier cannot be prefabricated in the factory, which leads to a long period of construction for these bridges, and it is harmful to the city. traffic and the environment have had a huge impact. There are a small number of prefabrication methods for segmental piers, but these methods are difficult to achieve precise docking when the piers are assembled, which increases the difficulty of construction, reduces work efficiency, and prolongs the construction period.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a prefabricated assembled segmental bridge pier structure and a construction method, which can realize precise docking during the assembly of bridge piers, reduce construction difficulty, improve construction efficiency, and shorten the construction period of bridges.

The present invention is achieved through the following technical solutions:

Prefabricated assembled segmental pier structure, including upper prefabricated pier, lower prefabricated pier and cast-in-place cap;

The upper surface of the cast-in-place cap is provided with a cap reserved groove, and during assembly, the lower part of the prefabricated pier of the lower section is placed in the cap reserved groove and fixed;

The upper part of the lower prefabricated pier is a hollow structure, and steps are formed on the inner side of the lower prefabricated pier; The end faces are even, the lower end face of the lower pier groove is flush with the step surface of the inner step of the lower prefabricated pier, and the lower pier groove is connected with the upper hollow structure of the lower prefabricated pier; the upper prefabricated pier has a variable cross-section from top to bottom Setting, the upper section area of the prefabricated pier is larger than the lower section area, and steps are formed around the outer periphery of the upper section prefabricated pier; The step surface of the outer peripheral steps of the upper prefabricated pier coincides, the lower end surface of the convex strip of the upper pier is flush with the lower end surface of the prefabricated pier of the upper section, and the convex strip of the upper pier matches the groove of the lower pier; during assembly, the lower part of the prefabricated pier Inserted into the upper hollow structure of the lower prefabricated pier, the convex strip of the upper pier is inserted into the groove of the lower pier, and the bottom of the upper prefabricated pier is fixed on the inner step of the lower prefabricated pier, and the step surface of the upper step of the upper prefabricated pier Placed on the top end face of the prefabricated pier of the next section.

Preferably, the lower part of the prefabricated pier is pre-embedded with the steel hoop of the lower pier, and the outer surface of the lower part of the steel hoop of the lower pier is provided with the first shear nail; the reserved groove of the cap gradually increases in cross section from bottom to top, and the cap The bottom surface of the reserved groove is the same size as the bottom surface of the lower prefabricated pier. When assembling, place the lower part of the lower prefabricated pier in the reserved groove of the cap, and pour into the gap between the cast-in-place cap and the lower prefabricated pier concrete.

Preferably, the lower part of the prefabricated pier is pre-embedded with steel plate hoops for the lower pier, and the upper and outer surfaces of the steel hoops for the lower pier are provided with pre-embedded steel plates for the lower pier; The buried steel plate and the pre-embedded steel plate of the lower pier are arranged in one-to-one correspondence; during assembly, after placing the lower part of the prefabricated pier in the reserved groove of the cap, the pre-embedded steel plate of the lower pier is placed on the top of the cast-in-place cap, and the prefabricated cap is placed The buried steel plate and the pre-embedded steel plate of the lower pier are connected by bolts.

Preferably, the lower section of the prefabricated pier transverse bridge is provided with a lower section of the pier protrusion on the side, and the lower section of the pier protrusion is arranged longitudinally and extends from the top of the lower section of the prefabricated pier to the lower section of the prefabricated pier and is flush with the upper surface of the cast-in-place platform position, and the upper part of the pier protrusion of the lower section is set in a convex groove structure, forming the pier groove of the lower section; the prefabricated pier cross bridge of the upper section is provided with the pier protrusion of the upper section to the side, and the pier protrusion of the upper section is arranged longitudinally and from the upper section The top of the prefabricated pier extends to the bottom of the prefabricated pier of the upper section, and the raised section of the lower part of the pier of the upper section forms a convex line of the pier of the upper section.

Preferably, the outer contour of the lower part of the upper prefabricated pier is smaller than the inner contour of the upper part of the lower prefabricated pier; the lower part of the upper prefabricated pier is pre-embedded with steel plate hoops for the upper pier, and the outer surface of the steel hoops for the upper pier is provided with second shear nails; The upper part of the prefabricated pier is provided with a grouting port and a vent hole, and the position of the vent hole is higher than the grouting port; during assembly, the lower part of the prefabricated pier of the upper section is inserted into the upper hollow structure of the prefabricated pier of the lower section, and concrete is injected from the grouting port.

Preferably, the grouting port is arranged on the side of the large pile number of the lower prefabricated pier, and the air vent is arranged on the small pile number side of the lower section of the prefabricated pier.

Preferably, a cover girder is arranged on the top of the prefabricated pier of the upper section, and the prefabricated pier of the upper section and the cover girder are arranged as an integral structure.

Preferably, the upper prefabricated pier is a hollow structure; the lower part of the lower prefabricated pier is a hollow structure, the lower prefabricated pier is arranged in a variable cross-section structure from top to bottom, and steps are formed between the upper and lower parts of the lower prefabricated pier.

The construction method of the prefabricated assembled segmental pier structure includes prefabricating the upper prefabricated pier and the lower prefabricated pier in the prefabrication factory, pouring the cast-in-place cap at the construction site, and transporting the upper prefabricated pier and the lower prefabricated pier to the construction site. On site, positioning is carried out through the reserved groove of the cap of the cast-in-place cap, and the lower prefabricated pier is hoisted into the reserved groove of the cap of the cast-in-place cap and connected and fixed. Positioning, hoisting the upper section of the prefabricated pier, so that the lower part of the upper section of the prefabricated pier is inserted into the upper hollow structure of the lower section of the prefabricated pier, and the convex strip of the upper section of the pier is inserted into the groove of the lower section of the pier.

Preferably, in the prefabricated assembled segmental pier structure, the lower part of the prefabricated pier is pre-embedded with the steel hoop of the lower pier, and the outer surface of the lower part of the steel hoop of the lower pier is provided with a first shear nail; The upper cross-section gradually increases, and the bottom surface of the reserved groove of the cap is the same size as the bottom surface of the lower prefabricated pier; the outer contour of the lower part of the upper prefabricated pier is smaller than the upper inner contour of the lower prefabricated pier; For the steel plate hoop of the bridge pier, the outer surface of the steel plate hoop of the upper section of the bridge pier is provided with a second shear nail; the upper part of the prefabricated pier of the lower section is equipped with a grouting port and a vent hole, and the position of the vent hole is higher than the grouting port;

The specific construction method steps are as follows:

Step 1: Prefabricate the upper section of the pier and the lower section of the pier through a special formwork;

Step 2, the construction site adopts cast-in-place concrete to pour the cast-in-place cap;

Step 3: Hoist the prefabricated lower section of the prefabricated pier above the cast-in-place cap, and drop it after positioning is completed until the bottom of the lower section of the prefabricated pier touches the bottom surface of the reserved groove of the cap;

Step 4, the gap between the cast-in-place cap and the prefabricated pier of the lower section is filled with concrete;

Step 5: After the cast-in-place concrete of the cast-in-place cap reaches 80% of the design strength, hoist the upper prefabricated pier above the lower prefabricated pier. The upper section of the prefabricated pier until the part below the steps of the upper section of the prefabricated pier completely enters the upper hollow structure of the lower section of the prefabricated pier.

Step 6: Pour concrete from the grouting port of the prefabricated pier in the lower section until the concrete flows out from the air vent and the consistency of the flow reaches the consistency of injection.

Compared with the prior art, the present invention has the following beneficial technical effects:

The present invention realizes the standardization, factoryization and assembly of the construction process by prefabricating the upper and lower piers and other auxiliary components in the factory. By prefabricating large bridge piers in sections, the large-scale prefabricated construction is realized, which can meet the rapid construction requirements of high-pier bridges, greatly shorten the construction period, improve the quality of the project, and reduce the impact on urban traffic and the environment during the construction process. adverse effects. A reserved slot for the cap is set on the cast-in-place cap. During assembly, it is convenient for positioning when hoisting the lower prefabricated pier; The latter forms a mortise-and-tenon structure, which is convenient for accurate positioning during hoisting, greatly reduces construction difficulty, greatly improves construction efficiency, and shortens the construction period.

Further, the reserved groove of the cap is set in the form of gradually increasing cross section from bottom to top, so that a gap is formed between the cast-in-place cap and the prefabricated pier of the lower section, and concrete can be injected into the gap, while the lower part of the prefabricated pier of the lower section Shear nails are set, so that the connection method of wet joint is adopted, so that the connection between the cast-in-place cap and the prefabricated pier of the lower section is more firm and reliable.

Further, the cast-in-place cap and the lower prefabricated pier are connected by steel plates to ensure the reliability of the connection between the lower prefabricated pier and the cast-in-place cap, and at the same time ensure that the bottom of the pier has sufficient compression, bending, shear and ductility anti-seismic capabilities .

Furthermore, the transverse protrusions of the upper prefabricated pier are set from the top cover beam to the bottom of the pier, corresponding to the convex groove of the lower prefabricated pier, which ensures the integrity and aesthetics of the pier and facilitates the manufacture and construction of prefabricated formwork.

Further, the grouting port and the vent hole are arranged on different surfaces and distributed in height, so that the cast-in-place concrete is more dense during the grouting construction, and it is convenient to check whether the consistency of the vent hole reaches the specified consistency.

Furthermore, the outer contour of the lower part of the upper prefabricated pier is smaller than the inner contour of the upper part of the lower prefabricated pier. A gap is formed between the upper prefabricated pier and the lower prefabricated pier, and concrete can be injected into the gap. At the same time, the lower part of the upper prefabricated pier is provided with shear Nails, so that the connection method of wet joint is adopted to make the connection between the prefabricated pier of the upper section and the precast pier of the lower section more firm and reliable.

Further, most of the existing methods adopt the construction method of prefabricating the cap beam and the bridge pier separately, which increases the on-site construction process and operation difficulty. Compared with the structure and construction method of the existing assembled prefabricated pier, the present invention improves the integrity of the structure and reduces the construction process of assembly because the cover girder and the prefabricated pier of the upper section are prefabricated in an integrated manner.

Furthermore, the interior of the upper and lower prefabricated piers adopts a hollow structure, which greatly reduces the self-weight of the pier on the premise of meeting the structural rigidity requirements, facilitates transportation and hoisting after prefabrication, saves the amount of concrete, and reduces construction costs.

In the construction method of the present invention, the upper and lower sections of the prefabricated bridge piers are all constructed using the factory-like prefabricated assembly technology, which realizes the standardization, factory-like, and assembly-like construction of the construction process, can meet the rapid construction requirements of high-pier bridges, and greatly reduces the construction. The cycle improves the quality of the project and reduces the adverse impact on urban traffic and the environment during the construction process.

Description of drawings

Fig. 1 is a structural axonometric view (a) of a prefabricated assembled segmental pier structure according to a specific embodiment of the present invention and a steel hoop structure diagram (b) of the lower section of the pier;

Fig. 2 is a transverse cross-sectional view of the lower prefabricated pier of a prefabricated assembled segmental pier structure according to a specific embodiment of the present invention;

Fig. 3 is a front view of a prefabricated assembled segmental pier structure according to a specific embodiment of the present invention;

Fig. 4 is a cross-sectional view of a prefabricated assembled segmental pier structure along the longitudinal plane where the grouting port and the vent hole are located according to the specific embodiment of the present invention;

In the figure: 1—prefabricated pier of the upper section; 2—prefabricated pier of the lower section; 3—cast-in-place cap; 4—embedded steel plate for bridge pier; 5—embedded steel plate for cap; 6—high-strength bolt; 7—bolt hole; 8 —Protrusion of the upper section; 9—Convex groove of the lower section; 10—Funnel-shaped reserved groove of the cap; ; 15—steel plate hoop of the lower pier; 16—cast-in-place concrete for cap; 17—cover beam; 18—support; 19—second shear nail.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

The key technology of the present invention lies in: the precise docking of the prefabricated pier of the lower section and the reserved groove of the cap of the cast-in-place cap, the precise docking of the prefabricated pier of the upper section and the prefabricated pier of the lower section, the pre-embedded steel plate of the pier and the pre-embedded steel plate of the cap Bolted connection, wet connection at the joint of the upper and lower precast piers after hoisting.

As shown in Figure 1, the prefabricated assembled segmental pier structure mainly includes the upper prefabricated pier 1, the lower prefabricated pier 2 and the cast-in-place cap 3.

The upper surface of the cast-in-place cap 3 is provided with a cap reserved groove 10 with an opening upward, and the lower part of the prefabricated pier 2 is pre-buried with a lower pier steel plate hoop 15, and the outer surface of the lower part of the lower pier steel plate hoop 15 is provided with a first shear force Nails 14, and have a certain thickness of the concrete protective layer, used to increase the bonding force between the prefabricated pier 2 of the lower section and the cast-in-situ concrete. During assembly, the lower part of the prefabricated pier 2 of the lower section is placed in the reserved groove 10 of the platform cap. In this embodiment, the cross-section of the reserved platform groove 10 gradually increases from bottom to top, and the bottom surface of the reserved platform groove 10 matches the bottom surface of the lower prefabricated pier 2. When assembling, the lower section of the prefabricated pier 2 is placed After being placed in the reserved groove 10 of the cap, fast-hardening high-strength concrete is poured into the gap between the cast-in-place cap 3 and the prefabricated pier 2 of the lower section to form the cast-in-place concrete 16 of the cap.

As shown in Figures 1 and 2, the top of the cast-in-place cap 3 is provided with a pre-embedded steel plate 5, the upper outer surface of the steel hoop 15 of the lower pier is provided with a pre-embedded steel plate 4 for the lower pier, and the pre-embedded steel plate 5 and The pre-embedded steel plates 4 of the lower pier are provided in one-to-one correspondence and are provided with bolt holes 7 respectively. During assembly, after the lower part of the prefabricated pier 2 is placed in the reserved groove 10 of the cap, the pre-embedded steel plates 4 of the lower pier are placed in the cast-in-place Above the platform cap 3, the pre-embedded steel plate 5 of the platform cap and the pre-embedded steel plate 4 of the lower pier are bolted through bolts 6 to increase their integrity. In this embodiment, the pre-embedded steel plate 4 of the lower pier is a combined right-angled triangular steel plate and a rectangular steel plate. Two right-angled triangular steel plates are vertically connected to one rectangular steel plate. The two right-angled triangular steel plates and one rectangular steel plate are welded on both sides. connected, and bolt holes 7 are set on the rectangular steel plates on both sides of the right-angled triangular steel plate, and the pre-embedded steel plate 5 of the bearing platform is a rectangular steel plate with the same size as the rectangular steel plate in the pre-embedded steel plate 4 of the lower pier. In this embodiment, two pre-embedded steel plates 4 for the lower pier are welded to each side of the steel plate hoop 15 of the lower pier, and one pre-embedded steel plate 4 for the lower pier is welded to each side of the longitudinal bridge. The pre-embedded steel plate 4 of the lower pier and the steel hoop 15 of the lower pier are welded on both sides;

As shown in Figure 4, the prefabricated pier 2 of the lower section is provided with a variable cross-section at the six points of the top of the pier. The lower section of the prefabricated pier 2 is provided with a lower section of the pier in the middle of the horizontal bridge. The lower section of the pier is arranged along the longitudinal direction and extends from the top of the lower section of the prefabricated pier 2 to the lower section of the prefabricated pier 2 and the cast-in-place cap 3 The position where the surface is even, and the upper part of the protrusion of the lower pier is set in a convex groove structure, forming the groove 9 of the lower pier, which is similar to the mortise. The upper end surface of the lower pier groove 9 is flush with the upper end surface of the lower prefabricated pier 2, the lower end surface of the lower pier groove 9 is flush with the step surface of the inner step of the lower prefabricated pier 2, and the lower pier groove 9 is aligned with the lower pier groove 9. The upper part of the prefabricated pier 2 is connected with the hollow structure. As shown in Figure 3, both sides of the lower section pier groove 9 on the side of the large pile number of the lower section prefabricated pier 2 are provided with grouting ports 11, and both sides of the lower section pier groove 9 on the side of the small pile number are provided with vent holes 12. The air hole 12 is positioned higher than the grouting port 11, so that the grouting construction can be done after the assembly of the upper and lower prefabricated piers is completed.

As shown in Figure 4, the prefabricated pier 1 of the upper section is provided with a variable cross-section at the sixth point of the pier bottom. . The upper section of the prefabricated pier 1 horizontal bridge is provided with an upper section pier protrusion at the position of the lateral central axis, the upper section of the pier protrusion is arranged along the longitudinal direction and extends from the top of the upper section of the prefabricated pier 1 to the bottom of the upper section of the prefabricated pier 1, and the upper section of the pier protrusion After the lower section becomes cross-sectioned, the upper section pier convex strip 8 is formed, which is similar to tenons. The size of the upper section pier convex section 8 is consistent with the size of the lower section pier groove 9. The outer contour of the lower part of the upper section prefabricated pier 1 is smaller than the upper inner contour of the lower section prefabricated pier 2.

The lower part of the prefabricated pier 1 of the upper section is pre-embedded with the steel plate hoop 13 of the upper section pier, and the outer surface of the steel hoop 13 of the upper section of the bridge pier is provided with a second shear nail 19, and has a certain thickness of the concrete protective layer, which is used to increase the prefabricated pier 1 of the upper section. Adhesion to cast-in-place concrete.

In this embodiment, both the upper prefabricated pier 1 and the lower prefabricated pier 2 are thin-walled hollow structures.

During assembly, the lower part of the upper prefabricated pier 1 is inserted into the upper cavity of the lower prefabricated pier 2, the convex strip 8 of the upper pier is inserted into the groove 9 of the lower pier, and the bottom of the upper prefabricated pier 1 is placed on the lower prefabricated pier 2 On the internal steps, the grout is then injected from the grout port, that is, the concrete is injected to improve the integrity of the structure through grouting.

The top of the prefabricated pier 1 of the upper section is provided with a cover beam 17 , the prefabricated pier 1 of the upper section and the cover beam 17 are constructed by integrated prefabrication, and the top of the cover beam is provided with a support 18 .

The construction method of the present invention is as follows: first pour the cast-in-place cap 3 at the construction site, then prefabricate the upper pier 1 and the lower pier 2 in the prefabrication factory, and assemble the pier after the maintenance is completed. When hoisting, install the prefabricated thin-walled hollow pier 2 of the lower section first, and after the prefabricated thin-walled hollow pier 2 of the lower section is hoisted into the reserved groove 10 of the cap, the pre-embedded steel plate 4 of the lower pier and the pre-embedded steel plate 5 of the cap are fastened with bolts 6 Then pour rapid-hardening high-strength concrete into the gap between the reserved groove 10 of the cap and the prefabricated pier 2 of the lower section, and finally hoist the prefabricated pier 1 of the upper section and grout from the lowest grouting hole 11.

The specific construction method steps are as follows:

Step 1: Realize the cross-section change of the lower prefabricated pier 2 and the protrusion and groove of the lower pier of the cross bridge through a special formwork, set the lower pier steel plate hoop 15 with shear nails on the lower part of the lower prefabricated pier 2, and connect it with the The inner main reinforcement of the prefabricated pier 2 of the lower section is welded, and has a certain thickness of the concrete protective layer. The pre-embedded steel plate 4 of the lower pier is welded to the steel plate hoop 15 of the lower pier at the position of the pre-embedded steel plate 4 of the lower pier, and the concrete is poured. The upper section prefabricated pier 1 and the lower section prefabricated pier 2 are prefabricated in the factory;

Step 2: Cast-in-place cap 3 is cast on site, and a cap reserved groove 10 is set on the top of cast-in-place cap 3. The size of the bottom surface of cap reserved groove 10 is the same as that of the bottom surface of the prefabricated pier 2 in the next section, and the top of cast-in-place cap 3 A rectangular steel plate with bolt holes 7 is pre-embedded at the position corresponding to the pre-embedded steel plate 4 of the lower pier.

Step 3: Use a crane to accurately hoist the prefabricated lower pier 2 above the cast-in-place cap 3, and slowly drop it after positioning is completed until the lower prefabricated pier 2 enters the specified depth of the cast-in-place cap 3.

Step 4: Connect the pre-embedded steel plate 5 of the platform cap with the pre-embedded steel plate 4 of the lower pier by bolts 6 .

Step 5, filling the gap between the reserved groove 10 of the funnel-shaped cap and the prefabricated pier 2 of the lower section to fill with rapid-hardening high-strength concrete.

Step 6: After the cast-in-place concrete of the cast-in-place cap 3 reaches 80% of the design strength, use a crane to accurately hoist the upper prefabricated pier 1 above the lower precast pier 2, and wait until the upper pier protrudes and the lower pier After the convex grooves are accurately docked, the upper prefabricated pier 1 is slowly lowered until the part below the variable section of the upper prefabricated pier 1 completely enters the upper cavity of the lower prefabricated pier 2 .

Step 7: Hoist the prefabricated pier 1 of the upper section into the upper cavity of the prefabricated pier 2 of the lower section, precisely connect the protruding strip 8 of the upper pier with the groove 9 of the lower pier, and press the grout from the cross bridge of the prefabricated pier 2 of the lower section to the side of the large pile number Port 11 begins to pour high-strength concrete until the cement slurry flows out from the highest air vent 12 on the other side and the consistency of the outflow reaches the consistency of injection.

Step 8, check whether the connection between the cast-in-place cap 3 and the prefabricated pier 2 of the lower section, and the prefabricated pier 2 of the lower section and the prefabricated pier 1 of the upper section meet the design requirements.

The main advantage of the present invention is that: by prefabricating the upper and lower piers and other auxiliary components in the factory, the standardization, factoryization and assembly of the construction process are realized. By prefabricating large bridge piers in sections, the large-scale prefabricated construction is realized, which can meet the rapid construction requirements of high-pier bridges, greatly shorten the construction period, improve the quality of the project, and reduce the impact on urban traffic and the environment during the construction process. adverse effects. Compared with the structure and construction method of the existing prefabricated bridge piers, since the cap beam and the bridge piers are prefabricated in an integrated way, the integrity of the structure is improved and the construction process of assembly is reduced; It is convenient for accurate positioning during hoisting and greatly improves construction efficiency. The system is simple in structure, does not require complex construction machinery, is easy to install, reduces the difficulty of assembly construction, reduces construction costs, and is easy to popularize. The pre-embedded steel plate of the pier and the pre-embedded steel plate of the cap are bolted by single-sided friction, and the connection method of wet joint is adopted between the upper and lower piers, as well as between the funnel-shaped reserved groove and the pier column, so that the connection is more firm and reliable . It has achieved the requirements of safety, high efficiency, environmental protection, durability, economy and sustainable development.

The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in related technical fields, are all included in the same principle. The patent protection scope of the present invention.

Claims (10)

1. The prefabricated assembled segmental pier structure is characterized in that it includes an upper prefabricated pier (1), a lower prefabricated pier (2) and a cast-in-place cap (3); The upper surface of the cast-in-place cap (3) is provided with a cap reserved groove (10), and during assembly, the lower part of the prefabricated pier (2) of the lower section is placed in the cap reserved groove (10) and fixed; The upper part of the lower prefabricated pier (2) is a hollow structure, and steps are formed inside the lower prefabricated pier (2); The upper end surface of the pier groove (9) is flush with the upper end surface of the lower section of the prefabricated pier (2), and the lower end surface of the lower section of the pier groove (9) is flush with the step surface of the inner step of the lower section of the prefabricated pier (2). The pier groove (9) of the section bridge is connected with the upper hollow structure of the prefabricated pier (2) of the lower section; A step is formed on the outer periphery of the prefabricated pier (1) of the upper section; the upper section of the prefabricated pier (1) is longitudinally provided with a convex strip (8) on the side of the lower part of the cross bridge, and the upper end surface of the convex strip (8) of the upper section is connected with the upper section The step surfaces of the outer peripheral steps of the prefabricated bridge piers (1) are coincident, the lower end surface of the upper section pier convex strip (8) is flush with the lower end surface of the upper section prefabricated bridge pier (1), and the upper section bridge pier convex strip (8) is aligned with the lower section pier groove ( 9) Coordination; when assembling, the lower part of the prefabricated pier (1) of the upper section is inserted into the upper hollow structure of the prefabricated pier (2) of the lower section, and the convex strip (8) of the upper section pier is inserted into the groove (9) of the lower pier, and the upper pier The bottom of the prefabricated pier (1) is fixed on the inner side of the prefabricated pier (2) of the lower section, and the step surface of the upper step of the prefabricated pier (1) of the upper section is placed on the top end surface of the prefabricated pier (2) of the lower section. 2. The prefabricated assembled segmental pier structure according to claim 1, characterized in that, the lower section of the prefabricated pier (2) is pre-embedded with a lower section of the pier steel hoop (15), and the lower section of the lower section of the pier steel hoop (15) is pre-embedded. The first shear stud (14) is provided on the outer surface; the cross-section of the reserved platform cap (10) gradually increases from bottom to top, and the bottom surface of the reserved platform cap (10) and the lower section of the prefabricated pier (2) The size of the bottom surface is the same. When assembling, place the lower part of the lower prefabricated pier (2) in the reserved groove (10) of the cap, and place it into the gap between the cast-in-place cap (3) and the lower prefabricated pier (2). Pour concrete. 3. The prefabricated assembled segmental bridge pier structure according to claim 1, characterized in that, the lower section of the prefabricated bridge pier (2) is pre-embedded with a steel plate hoop (15) for the lower section of the bridge pier, and the upper section of the steel plate hoop (15) for the lower section of the bridge pier The outer surface is provided with the pre-embedded steel plate (4) of the lower pier; ) in one-to-one correspondence; during assembly, after placing the lower part of the prefabricated pier (2) in the cap reserved groove (10), the pre-embedded steel plate (4) of the lower pier is located above the cast-in-place cap (3), Connect the pre-embedded steel plate (5) of the bearing platform and the pre-embedded steel plate (4) of the lower pier through bolts (6). 4. The prefabricated assembled segmental pier structure according to claim 1, characterized in that, the lower section of the prefabricated pier (2) transverse bridge is provided with a lower section pier protrusion to the side, and the lower section pier protrusion is arranged longitudinally and from The top of the lower prefabricated pier (2) extends to the position where the lower prefabricated pier (2) is flush with the upper surface of the cast-in-place cap (3), and the upper part of the lower pier is raised in a convex groove structure, forming the lower pier Groove (9); the upper section of the prefabricated pier (1) is provided with the upper section of the bridge pier protruding sideways, and the upper section of the pier projection is arranged along the longitudinal direction and extends from the top of the upper section of the prefabricated pier (1) to the upper section of the prefabricated pier (1) At the bottom, the lower section of the raised pier of the upper section forms the convex strip (8) of the pier of the upper section. 5. The prefabricated assembled segmental pier structure according to claim 1, characterized in that, the lower outer contour of the upper prefabricated pier (1) is smaller than the upper inner contour of the lower prefabricated pier (2); the upper prefabricated pier (1) The lower part is pre-embedded with the steel plate hoop (13) of the upper section of the bridge pier, and the outer surface of the steel plate hoop (13) of the upper section of the bridge pier is provided with a second shear nail (19); and the vent hole (12), the position of the vent hole (12) is higher than the grouting port (11); during assembly, after the lower part of the prefabricated pier (1) of the upper section is inserted into the upper hollow structure of the prefabricated pier (2) of the lower section, Inject concrete from the grouting port (11). 6. The prefabricated assembled segmental pier structure according to claim 1, characterized in that the grouting port (11) is arranged on the large pile number side of the prefabricated pier (2) in the lower section, and the vent hole (12) is arranged in the lower section The small pile number side of the prefabricated pier (2). 7. The prefabricated assembled segmental pier structure according to claim 1, characterized in that, the top of the upper prefabricated pier (1) is provided with a cover beam (17), and the upper section of the prefabricated pier (1) and the cover beam (17) Set as one structure. 8. The prefabricated assembled segmental pier structure according to claim 1, characterized in that the upper prefabricated pier (1) is a hollow structure; the lower part of the prefabricated pier (2) is a hollow structure, and the lower prefabricated pier (2) is hollow. ) is arranged in a variable cross-section structure from top to bottom, and a step is formed between the upper part and the lower part of the prefabricated pier (2) of the lower section. 9. The construction method of the prefabricated assembled segmental pier structure according to any one of claims 1-8, characterized in that, in the prefabrication factory, the upper prefabricated pier (1) and the lower prefabricated pier (2) are prefabricated. The cast-in-place cap (3) is poured at the construction site, the upper prefabricated bridge pier (1) and the lower prefabricated bridge pier (2) are transported to the construction site, and positioned through the cap reserved groove (10) of the cast-in-place cap (3) , hoist the lower prefabricated pier (2) into the cap reserved groove (10) of the cast-in-place cap (3) and connect and fix it, through the upper pier protrusion (8) and the lower pier groove (9) Positioning, hoisting the upper prefabricated pier (1), so that the lower part of the upper prefabricated pier (1) is inserted into the upper hollow structure of the lower prefabricated pier (2), and the upper pier convex strip (8) is inserted into the lower pier groove (9) middle. 10. The construction method of the prefabricated assembled segmental pier structure according to claim 9, characterized in that, in the prefabricated assembled segmental pier structure, the lower section of the prefabricated pier (2) is pre-embedded with a lower section of the pier steel hoop ( 15), the outer surface of the lower part of the steel plate hoop (15) of the lower section of the bridge pier is provided with a first shear nail (14); ) has the same size as the bottom surface of the lower prefabricated pier (2); the outer contour of the lower part of the upper prefabricated pier (1) is smaller than the upper inner contour of the lower prefabricated pier (2); The steel plate hoop (13) of the section bridge pier, the second shear nail (19) is provided on the outer surface of the steel plate hoop (13) of the upper section bridge pier; 12), the vent hole (12) is positioned higher than the grouting port (11); The specific construction method steps are as follows: Step 1, prefabricating the upper section prefabricated pier (1) and the lower section prefabricated pier (2) in the factory through a special formwork; Step 2, the construction site uses cast-in-place concrete to pour the cast-in-place cap (3); Step 3: hoist the prefabricated lower section of the prefabricated pier (2) above the cast-in-place cap (3), and drop it after positioning is completed until the bottom of the lower section of the prefabricated pier (2) touches the reserved groove of the cap (10) the bottom surface; Step 4, the gap between the cast-in-place cap (3) and the lower prefabricated pier (2) is filled with concrete; Step 5: After the cast-in-place concrete of the cast-in-place cap (3) reaches 80% of the design strength, hoist the upper prefabricated pier (1) above the lower prefabricated pier (2), and wait until the upper pier convex strip (8 ) and the lower pier groove (9) are accurately docked, lower the upper prefabricated pier (1) until the part below the step of the upper prefabricated pier (1) completely enters the upper hollow structure of the lower prefabricated pier (2); Step 6, pour concrete from the grouting opening (11) of the prefabricated pier (2) in the lower section until the concrete flows out from the air vent (12) and the consistency of the flow reaches the consistency of injection.