CN111827095A - Prefabricated and assembled hollow pier with built-in ribs and construction method - Google Patents

Abstract

The invention provides a prefabricated assembled hollow bridge pier with built-in ribs and a construction method, and relates to the technical field of bridge construction. From bottom to top, it includes foundation, bottom segment, middle segment, and top hat segment. The top of the foundation is provided with pre-embedded steel bars, and the stirrups are provided on the pre-embedded steel bars; the bottom segment is provided with solid segments, bottom segments and solid segments. Prefabricated at the same time, the connecting reinforcement channel is reserved on the solid section, and the diameter of the connecting reinforcement channel is 5cm larger than that of the embedded steel bar at the top of the foundation; the channel of the embedded steel bar is filled with post-cast concrete; the bottom section and the middle section are . Rib plates are arranged on the top hat segments, and connecting bars are arranged on each rib plate, and each connecting bar extends out of the corresponding rib plate, and the connecting bars between each segment overlap each other by more than 10 times the diameter of the bars; Sections, middle sections, and top hat sections are all pre-embedded with pre-stressed pipes, which are connected by penetrating through-length pre-stressed bundles. This case can solve the shortcomings of insufficient energy consumption and low ductility of pre-stressed assembled piers.

Description

Prefabricated and assembled hollow pier with built-in ribs and construction method

technical field

The invention relates to the technical field of bridge construction, in particular to a prefabricated assembled hollow bridge pier with built-in ribs and a construction method.

Background technique

At present, when the bridge pier spans a large river or ocean, the construction conditions are harsh, the wind and waves are large, the effective working time on site is short, and the concrete pouring and maintenance are difficult, so it is not suitable for the cast-in-place construction. The on-site work time is shortened and the project quality is improved; and the water transportation and hoisting capabilities are strong, the piers can be divided into large segments, and large mechanical equipment is used for assembly, which is suitable for hollow piers with higher height; in some waters at home and abroad or It has been applied in sea area bridge engineering.

Hollow bridge piers are often high in height and large in section size, and ordinary steel bars are arranged on the inside and outside of the pier wall. When prefabricated and assembled, it is difficult to connect dense steel bars, so prestressing is often used for connection, that is, each section is connected Epoxy resin glue is applied between the segments, and then the connection between segments is realized by prestressed beams. This connection method is only connected by prestressed beams, which has shortcomings such as insufficient energy dissipation capacity and low ductility, and is not suitable for high seismic areas; the sea is mostly corrosive, and the durability requirements are high, and the prestressed beams have the risk of corrosion. Serious corrosion will lead to connection failure and affect the safety of the structure, and the prestressed bundles are located in the tunnel, which is often difficult to inspect, repair and replace. Problems such as weak local stability of the pier wall.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a prefabricated assembled hollow bridge pier with built-in ribs and a construction method, so as to alleviate the above-mentioned problems in the prior art.

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

The prefabricated and assembled hollow bridge pier with built-in ribs provided by the present invention includes a foundation, a bottom segment, a middle segment, and a top hat segment in sequence from bottom to top. The top of the foundation is provided with pre-embedded steel bars, and the pre-embedded steel bars are provided with hoops The pre-embedded steel bar has a certain rigidity to ensure its verticality; the pre-embedded steel bar and the stirrup form a plurality of steel cages, which are scattered on the foundation.

A solid section is arranged below the bottom section, and the bottom section and the solid section are prefabricated together to ensure the integrity of the bottom section and the solid section. The connecting steel channel is reserved on the solid section, and the diameter of the connecting steel channel is larger than that of the basic embedded steel bar. The side is 5cm larger to facilitate its penetration.

Post-cast concrete, using micro-expansion concrete or high-performance concrete, fills in the pre-embedded steel duct, anchors the embedded steel, and realizes the connection between the solid segment and the foundation.

The bottom segment, the middle segment, and the top hat segment are all provided with rib plates, each of the rib plates is provided with connecting bars, and each of the connecting bars extends out of the corresponding rib by a certain length. The connecting steel bars between the segments are overlapped with each other by more than 10 times the diameter of the steel bars, and UHPC is poured to realize the connection and force transmission between the connecting steel bars of each segment.

The foundation, bottom segment, middle segment, and top hat segment are all pre-embedded with prestressed pipes, which are connected by penetrating a full-length prestressed bundle to ensure the connection performance between the segments; the fixed end of the prestressed bundle is set at the In the foundation, connected by self-locking anchors, the top end penetrates the full-length prestressed bundle and then locks in the foundation, and the tensioning end at the top of the top hat segment is tensioned to seal the anchor.

Further, a plurality of the rib plates are arranged on the inner side of the pier wall of the bottom segment, the middle segment, and the top hat segment, and are distributed along the circumference, and the plurality of the rib plates are prefabricated together with each segment.

Further, each rib is flush with the upper part of the connected segment, and an enlarged head is used at a certain position on the upper part of each rib, and the outer contour of the enlarged head is larger than the size of the lower part of the rib of the connected segment.

Further, the cross-sectional dimension of the lower part of the rib is shorter than that of the connected segment, and the lower part of the rib is arranged in a slope form.

Further, each of the connecting reinforcing bars protrudes from the rib of the connected segment, and the connecting reinforcing bars are arranged in a staggered manner, and the connecting reinforcing bars located in the upper segment are arranged in the middle of the connecting reinforcing bars located in the lower segment. The stirrups are bound, and the stirrups are arranged around the connecting bars of the upper and lower segments.

Further, each of the connecting steel bars extends out of the rib of the connected segment, and the connecting steel bars are arranged inside and outside. When one side connecting steel bars are arranged outside, the corresponding segments are prefabricated around the connecting steel bars to bind stirrups; When one side of the connecting steel bar is arranged on the inner side, the stirrups are bound around the connecting steel bar during the prefabrication of the corresponding segment, and the inner connecting steel bar is inserted into the outer connecting steel bar during assembly to realize the connection.

Further, the connecting reinforcing bars may protrude from the ribs of adjacent segments, or may protrude from the interior of adjacent segments.

Further, UHPC is used as the casting material between the ribs; UHPC is cast in the gap between the ribs and the upper and lower segments.

A construction method of a prefabricated assembled hollow bridge pier with a built-in rib plate provided by the present invention comprises the following steps:

Step 1, foundation construction, tie the stirrups of the pre-embedded steel bars, and prefabricate the bottom section, middle section and top hat section to be assembled;

Step 2: Lay high-strength mortar for the bottom joint on the top surface of the foundation, hoist the bottom segment for installation by the grouting method, and insert the pre-embedded steel bar into the connecting steel bar channel of the solid segment, and pour concrete after pouring;

Step 3: Lay the middle joint epoxy glue on the top surface of the bottom section, hoist the middle section for installation, align the lower connecting steel bar of the middle section and the connecting steel bar of the bottom section, penetrate each other or bind the middle section to connect. Sew stirrups, set up temporary formwork, and pour UHPC in the middle section;

Step 4: Lay the middle joint epoxy glue on the top surface of the lower middle section, hoist the upper middle section, align the lower connecting steel bars of the upper middle section with the connecting steel bars of the lower middle section, and penetrate or bind each other in the middle Sectional joint stirrups, temporary formwork erection, intermediate section UHPC pouring;

Step 5: Lay the middle joint epoxy glue on the top surface of the middle section, hoist the top hat section, align the top hat section connecting steel bars with the connecting steel bars on the middle section, and penetrate or bind the top hat sections. Joint stirrups, temporary formwork erection, UHPC pouring of the top hat segment;

Step 6: From the top of the top hat segment, penetrate the full-length prestressed bundles into the top hat segment, the middle segment, the bottom segment, and the pre-embedded prestressed pipeline in the foundation in turn, and stretch from the top of the top hat segment. The end is tensioned and the anchor is sealed;

Step 7: grouting the pipeline with the long prestressed beam.

The beneficial effects of the present invention are:

The prefabricated assembled hollow bridge pier with built-in rib and the construction method provided by the present invention have the following effects:

1. By adding connecting steel bars, the shortcomings of insufficient energy consumption and low ductility of prestressed assembled piers can be solved, which can be suitable for high earthquake areas; connecting steel bars do not occupy space on the pier wall, and the prestressing arrangement on the pier wall is flexible and easy to manufacture; the connecting steel bars are constructed It is not affected by the harsh conditions of the external environment, which is conducive to construction and does not affect the appearance of the structure; the connecting steel bars are located inside the structure, which has good durability and is suitable for erosive environments;

2. Through the combination of prestressed steel bundles and connecting steel bars, the connection performance at the joints is significantly improved, and the risks of corrosion and failure of prestressed bundles existing in pure prestressed connections are compensated. Prestress threading, tensioning and other processes;

3. By setting the rib plate, the stability of the segment is improved, the length of the segment of the pier column segment is increased, the number of joints is reduced, and the overall stability of the pier and the local stability of the pier wall is improved, which is especially suitable for water or sea areas. High pier; During the cast-in-place construction of the bridge pier, due to the influence of the climbing formwork of the inner formwork, the setting of the rib plate greatly increases the construction difficulty.

4. The inter-segment UHPC is also used as a structural shear key, and there is no shear key on the pier wall, which simplifies the setting of special formwork during segment manufacturing, saves costs and speeds up segment manufacturing progress; pier wall shear key is not required during assembly Accurate alignment to speed up assembly.

5. The connecting steel bars are lapped by UHPC, and the steel bars do not need to be connected one by one, which is convenient for construction. UHPC joints have small pouring volume, small height, self-compacting, vibration-free, and convenient construction.

6. During the segment assembly process, the segment can be temporarily locked by tying the stirrups connecting the steel bars to ensure the stability of the segment during the assembly process.

7. When the pier column is required to be navigable or anti-collision, a solid section is set at the bottom of the pier, and the solid pier is prefabricated together with the pier column and is reliably connected to the foundation.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the elevational structure schematic diagram of the prefabricated assembled hollow pier with built-in rib provided by the present invention;

2 is a schematic diagram of the basic structure of a prefabricated assembled hollow pier with a built-in rib provided by the present invention;

3 is a schematic diagram of the bottom segment structure of the prefabricated assembled hollow pier with built-in ribs provided by the present invention;

4 is a schematic structural diagram of a middle section of a prefabricated assembled hollow pier with a built-in rib provided by the present invention;

5 is a schematic structural diagram of a top hat segment of a prefabricated assembled hollow pier with a built-in rib provided by the present invention;

6 is a schematic view of the first embodiment of the assembly of the intermediate joints of the prefabricated and assembled hollow piers with built-in ribs provided by the present invention;

7 is a schematic diagram of the second embodiment of the assembly of the intermediate joints of the prefabricated and assembled hollow piers with built-in ribs provided by the present invention;

8 is a schematic view of the third embodiment of the assembly of the intermediate joints of the prefabricated and assembled hollow piers with built-in ribs provided by the present invention;

FIG. 9 is a schematic view of the bottom seam assembling of the prefabricated assembled hollow pier with built-in ribs provided by the present invention.

icon:

1-basic;

101-Embedded steel bars;

102 - stirrups;

2 - bottom segment;

201 - entity segment;

202-connecting steel ducts;

203 - post-cast concrete;

204- bottom segment rib;

205 - Bottom segment connecting reinforcement;

3 - the middle segment;

301- Middle segment rib;

302 - Connecting steel bars under the middle segment;

303 - mid-segment joint stirrup;

304 - Intermediate segment UHPC;

305 - Connecting steel bars on the middle segment;

4 - top hat segment;

401 - Top hat segment rib;

402 - Top hat segment connecting reinforcement;

403 - Top hat segment seam stirrups;

404 - Top Hat Segment UHPC;

5- Bottom seam;

6-Intermediate seam;

7- Prestressed pipes;

8- full length prestressed beam;

801 - Anchoring end of prestressed beam;

802 - Tensioning end of prestressed beam;

803 - prestressed bundle anchor;

9- grouting;

10- Temporary template;

11- Connect the inner stirrups of the rebar.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example

As shown in Figure 1-9, a prefabricated assembled hollow pier with built-in ribs includes foundation 1, bottom segment 2, middle segment 3, and top hat segment 4 in order from bottom to top. The embedded steel bar 101 is provided with stirrups 102 on the embedded steel bar 101, so that the embedded steel bar 101 has a certain rigidity and ensures that it is vertical;

A solid section 201 is arranged below the bottom section 2, and the bottom section 2 is prefabricated together with the solid section 201 to ensure the integrity of the bottom section 2 and the solid section 201. The solid section 201 is reserved for connecting steel bar holes 202, and the diameter of the connecting steel bar holes 202 The size is 5cm larger than that of the embedded steel bar 101 of the foundation 1 on each side, which is convenient for its penetration.

The post-cast concrete 203 is made of micro-expanded concrete or high-performance concrete, filled in the holes of the pre-embedded steel bars 101 , and anchored to the pre-embedded steel bars 101 to realize the connection between the solid section 201 and the foundation 1 .

The bottom segment 2, the middle segment 3, and the top hat segment 4 are all provided with ribs, and each rib is provided with connecting steel bars, and each connecting steel bar extends out of the corresponding rib for a certain length. The steel bars are overlapped with each other by more than 10 times the diameter of the steel bars, and UHPC is poured to realize the connection and force transmission between the connecting steel bars of each segment.

Foundation 1, bottom section 2, middle section 3, and top hat section 4 are all pre-embedded with pre-stressed pipes 7, which are connected by penetrating through-length pre-stressed bundles 8 to ensure the connection performance between segments; pre-stressed bundles The anchoring end 801 is set in the foundation 1, connected by a self-locking anchor, penetrates the full-length prestressed bundle 8 from the top and locks in the foundation 1, and stretches the end 802 from the prestressed bundle at the top of the top hat segment 4 Tension is performed, and prestressed bundle anchors 803 are performed.

Further, a plurality of ribs are arranged on the inner side of the pier wall of the bottom section 2, the middle section 3, and the top hat section 4, and are distributed along the circumference, and the plurality of ribs are prefabricated together with each section.

Further, each rib is flush with the upper part of the connected segment, and an enlarged head is used at a certain position on the upper part of each rib, and the outer contour of the enlarged head is larger than the size of the lower part of the rib of the connected segment.

Specifically, the top of each bottom segment rib 204 is flush with the top surface of the bottom segment 2, an enlarged head is used at a certain position on the upper part of each bottom segment rib 204, and the outer contour of the enlarged head is lower than the lower part of the rib of the connected segment. Large size.

Specifically, the top of each intermediate segment rib 301 is flush with the intermediate segment 3, and the upper part of each intermediate segment rib 301 adopts an enlarged head at a certain position. It is shorter than the bottom of the middle section 3, and the bottom of the rib is set as a slope, which is convenient for UHPC pouring and compactness.

Further, the cross-sectional dimension of the rib is shorter than that of the connected segment below, and the lower part of the rib is set in the form of a slope.

Specifically, the bottom of the top hat segment rib 401 is shorter than the bottom of the top hat segment 4, and the bottom is set in a slope form, which is convenient for UHPC pouring and compactness.

As shown in Figure 6, each connecting steel bar protrudes from the rib of the connected segment, and the connecting steel bars are arranged in a staggered manner. The stirrups 102 are then bound, and the stirrups 102 are arranged around the connecting bars of the upper and lower segments.

Specifically, the connecting reinforcing bars use ordinary reinforcing bars arranged inside the rib to extend out of the rib of the bottom segment 2, the middle segment 3, and the top hat segment 4.

It should be pointed out that the bottom segment connecting bars 205 protrude above the bottom segment rib 204, the middle segment lower connecting bars 302 protrude below the middle segment rib 301, and the bottom segment connecting bars 205 are connected to the lower middle segment. The plane positions of the steel bars 302 are staggered to each other, which is easy to penetrate, to ensure that the overlapping length is not less than 10 times the diameter of the steel bars, and the middle section joint stirrups 303 are arranged around to strengthen the connection.

It should also be pointed out that the connecting steel bars 305 on the middle section protrude above the middle section rib 301, the top hat section connecting steel bars 402 protrude below the top hat section rib 401, and the middle section connecting steel bars 305 and the top hat section. The plane positions of the connecting bars 402 of the hat segment are staggered to each other, which is easy to penetrate, ensuring that the overlap length is not less than 10 times the diameter of the bar, and the top hat segment 4 stirrups 102 are arranged around to strengthen the connection.

As shown in Figure 7, each connecting steel bar protrudes from the rib of the connected segment, and the connecting steel bars are arranged inside and outside. When one side connecting steel bar is arranged on the outside, the corresponding segment is prefabricated and the stirrups are bound around the connecting steel bar. 102; when one side of the connecting steel bar is arranged on the inside, the inner stirrup 11 of the connecting steel bar is formed. When the corresponding segment is prefabricated, the stirrups 102 are bound around the connecting steel bar, and the inner connecting steel bar is inserted into the outer connecting steel bar during assembly to realize the connection. .

As shown in FIG. 8 , the connecting bars can protrude from the ribs of adjacent segments, and can also protrude from the interior of adjacent segments.

In addition, the pouring material between each rib is UHPC, that is, UHPC is poured in the gap between the rib and the upper and lower segments.

Between UHPC pouring and each rib, the connecting steel bars extending from the connecting rib have the same size as the expansion of the lower rib to be connected, and the gap between the temporary formwork 10 and the connected upper segment rib during pouring Pouring; the height is not less than 10 times the diameter of the connecting steel bar to ensure the reliable connection of the connecting steel bar; the connection between the cast-in-place UHPC and the prefabricated upper and lower ribs and pier walls is firm, and it also serves as the shear key between the prefabricated structures; the UHPC pouring volume is small and the height Small, self-compacting, vibration-free, and easy to construct.

A construction method of a prefabricated assembled hollow bridge pier with a built-in rib provided by an embodiment of the present invention includes the following steps:

Step 1, the foundation 1 is constructed, the stirrups 102 of the pre-embedded steel bars 101 are bound, the bottom segment 2, the middle segment 3, and the top hat segment 4 are prefabricated and assembled;

Step 2: Lay the bottom joint 5 high-strength mortar on the top surface of the foundation 1, hoist the bottom section 2 for grouting installation, and insert the embedded steel bar 101 into the connecting steel bar channel 202 of the solid section 201, and pour concrete 203 after pouring ;

Step 3: Lay the middle joint 6 epoxy glue on the top surface of the bottom section 2, hoist the middle section 3 for installation, align the lower connecting steel bar 302 of the middle section and the connecting steel bar 205 of the bottom section, penetrate each other or Bind the joint stirrups 303102 of the middle section, set up the temporary formwork 10, and pour the middle section UHPC304;

Step 4: Lay the middle joint 6 epoxy glue on the top surface of the lower middle section 3, hoist the upper middle section 3, and align the lower connecting steel bar 302 of the upper middle section with the connecting steel bar 305 of the lower middle section, so that they are mutually Pierce or bind the joint stirrups 303102 in the middle section, set up the temporary formwork 10, and pour the middle section UHPC304;

Step 5: Lay the middle joint 6 epoxy glue on the top surface of the middle section 3, hoist the top hat section 4, align the top hat section connecting steel bar 402 with the connecting steel bar 305 on the middle section, penetrate each other or Binding the joint stirrups 403102 of the top hat segment, erecting the temporary formwork 10, and pouring the top hat segment UHPC404;

Step 6: From the top of the top hat segment 4, penetrate the long prestressed bundle 8 into the top hat segment 4, the middle segment 3, the bottom segment 2, and the pre-embedded prestressed pipe 7 in the foundation 1 in turn, and from the top The tension end at the top of the cap segment 4 is tensioned to seal the anchor;

Step 7, grouting 9 the pipes of the long prestressed bundles 8 .

The prefabricated assembled hollow bridge pier with built-in rib and the construction method provided by the embodiment of the present invention have the following effects:

1. By adding connecting steel bars, the shortcomings of insufficient energy consumption and low ductility of prestressed assembled piers can be solved, which can be suitable for high earthquake areas; connecting steel bars do not occupy space on the pier wall, and the prestressing arrangement on the pier wall is flexible and easy to manufacture; the connecting steel bars are constructed It is not affected by the harsh conditions of the external environment, which is conducive to construction and does not affect the appearance of the structure; the connecting steel bars are located inside the structure, which has good durability and is suitable for erosive environments;

2. Through the combination of prestressed steel bundles and connecting steel bars, the connection performance at the joints is significantly improved, and the risks of corrosion and failure of prestressed bundles existing in pure prestressed connections are compensated. Prestress threading, tensioning and other processes;

3. By setting the rib plate, the stability of the segment is improved, the length of the segment of the pier column segment is increased, the number of joints is reduced, and the overall stability of the pier and the local stability of the pier wall is improved, which is especially suitable for water or sea areas. High pier; During the cast-in-place construction of the bridge pier, due to the influence of the climbing formwork of the inner formwork, the setting of the rib plate greatly increases the construction difficulty.

4. The inter-segment UHPC is also used as a structural shear key, and there is no shear key on the pier wall, which simplifies the setting of special formwork during segment manufacturing, saves costs and speeds up segment manufacturing progress; pier wall shear key is not required during assembly Accurate alignment to speed up assembly.

5. The connecting steel bars are lapped by UHPC, and the steel bars do not need to be connected one by one, which is convenient for construction. UHPC joints have small pouring volume, small height, self-compacting, vibration-free, and convenient construction.

6. During the segment assembling process, the segment can be temporarily locked by binding the stirrups 102 connecting the reinforcing bars to ensure the stability of the segment during the assembling process.

7. When the pier column has requirements for navigation or anti-collision, a solid section 201 is set at the bottom of the pier, and the solid pier and the pier column are prefabricated together and connected with the foundation 1 reliably.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some or all of the technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a hollow pier is assembled in prefabrication of built-in floor in area, by down and on include basis (1), end festival section (2), middle festival section (3), top cap festival section (4) in proper order, its characterized in that:

the top of the foundation (1) is provided with embedded steel bars (101), and the embedded steel bars (101) are provided with stirrups (102);

a solid section (201) is arranged below the bottom section (2), the bottom section (2) and the solid section (201) are prefabricated together, a connecting steel bar hole (202) is reserved in the solid section (201), and the diameter of the connecting steel bar hole (202) is 5cm larger than that of each side of an embedded steel bar (101) at the top of the foundation (1);

post-cast concrete (203) is filled in the pore channel of the embedded steel bar (101);

ribbed plates are arranged on the bottom section (2), the middle section (3) and the top cap section (4), each ribbed plate is provided with a connecting steel bar, each connecting steel bar extends out of the corresponding ribbed plate, and the connecting steel bars among the sections are mutually lapped by more than 10 times of the diameter of the steel bar;

the foundation (1), the bottom section (2), the middle section (3) and the top cap section (4) are all pre-embedded with prestressed pipelines (7) and are connected by penetrating through long prestressed tendons (8).

2. The precast assembled hollow pier with the built-in rib plate as claimed in claim 1, wherein the embedded steel bars (101) and the stirrups (102) form a plurality of reinforcement cages which are dispersedly arranged on the foundation (1).

3. The precast assembled hollow pier with built-in ribs according to claim 1, wherein a plurality of ribs are provided inside the pier walls of the bottom segment (2), the middle segment (3) and the top cap segment (4) and are distributed around, and the plurality of ribs are precast together with the segments.

4. The prefabricated assembled hollow pier with the built-in rib plates as claimed in claim 1, wherein each rib plate is flush with the upper part of the connected segment, an enlarged head is adopted at a certain position of the upper part of each rib plate, and the outer contour of the enlarged head is larger than the size of the lower part of the rib plate of the connected segment.

5. The precast assembled hollow pier with the built-in rib plate as claimed in claim 4, wherein the rib plate has a shorter sectional dimension than the lower connected segment, and the lower part of the rib plate is provided in a slope form.

6. The prefabricated assembled hollow pier with the built-in ribbed plates according to claim 1, wherein each connecting steel bar extends out of the ribbed plates of the connected sections, the connecting steel bars are arranged in a staggered mode, the connecting steel bar positioned on the upper section is arranged in the middle of the connecting steel bar positioned on the lower section, a binding stirrup (102) is penetrated, and the binding stirrups (102) are arranged on the periphery of the connecting steel bars positioned on the upper section and the lower section.

7. The prefabricated assembled hollow pier with the built-in ribbed plates according to claim 1, wherein each connecting steel bar extends out of the ribbed plates of the connected segments, the connecting steel bars are arranged inside and outside, and when the connecting steel bar on one side is arranged on the outer side, stirrups (102) are bound around the connecting steel bar when the corresponding segment is prefabricated; when one side connecting reinforcement is arranged in the inner side, stirrups are bound around the connecting reinforcement when corresponding sections are prefabricated, and the inner side connecting reinforcement penetrates into the outer side connecting reinforcement during assembling.

8. The precast assembled hollow pier with the built-in rib plate according to claim 1, wherein the connecting reinforcement includes rib plate reinforcements and pier column reinforcements.

9. The prefabricated assembled hollow pier with the built-in ribbed plates according to claim 1, wherein UHPC is adopted as a casting material between the ribbed plates.

10. A construction method of a prefabricated assembled hollow pier with built-in ribbed slabs is characterized by comprising the following steps:

firstly, constructing a foundation (1), binding stirrups (102) of embedded steel bars (101), and prefabricating a bottom section (2), a middle section (3) and a top cap section (4) to be assembled;

secondly, paving high-strength mortar at a bottom joint (5) on the top surface of the foundation (1), hoisting the bottom section (2) for installation by a mortar sitting method, penetrating the embedded steel bars (101) into a connecting steel bar hole channel (202) of the solid section (201), and pouring post-cast concrete (203);

laying an epoxy resin adhesive of a middle joint (6) on the top surface of the bottom section (2), hoisting the middle section (3) for installation, aligning a lower connecting steel bar (302) of the middle section with a connecting steel bar (205) of the bottom section, mutually penetrating or binding a joint stirrup (303) of the middle section, erecting a temporary template, and pouring a UHPC of the middle section;

fourthly, laying epoxy resin glue of a middle joint (6) on the top surface of the lower middle section (3), hoisting the upper middle section (3), aligning a lower connecting steel bar (302) of the upper middle section with an upper connecting steel bar (305) of the lower middle section, mutually penetrating or binding a joint stirrup (303) of the middle section, erecting a temporary template, and pouring a UHPC of the middle section;

laying epoxy resin glue of a middle joint (6) on the top surface of the middle section (3), hoisting the top cap section (4), aligning a top cap section connecting steel bar (402) with a middle section upper connecting steel bar (305), mutually penetrating or binding a top cap section joint stirrup (403), erecting a temporary template, and pouring a top cap section UHPC;

penetrating full-length prestressed bundles (8) into pre-buried prestressed pipelines (7) of the foundation (1), the bottom section (2), the middle section (3) and the top cap section (4) from the top end of the top cap section (4), and tensioning and sealing the anchor from a tensioning end at the top end of the top cap section (4);

and seventhly, grouting (9) is carried out on the pipeline with the full length of the prestressed tendons (8).

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