Prefabricated assembled hollow bridge pier with diaphragm and construction method

Abstract

The present invention provides a prefabricated assembled hollow pier with a diaphragm and a construction method, and relates to the technical field of bridge construction. From bottom to top, it includes a foundation, a general segment and a top cap segment in sequence, and a foundation connecting steel bar and a foundation connecting column are arranged at the top of the foundation; a general segment diaphragm is arranged at the top and bottom of the general segment, a general segment reserved groove is arranged on the general segment diaphragm at the bottom, and a general segment connecting steel bar is arranged on the general segment diaphragm at the top; a top cap segment diaphragm is arranged at the bottom of the top cap segment, and a top cap segment reserved groove is arranged on the top cap segment diaphragm at the bottom; during assembly, the connecting steel bars and connecting columns at the bottom are extended into the corresponding reserved grooves at the top, and high-strength slurry is poured into each reserved groove; the foundation, the general segment and the top cap segment are all pre-buried with prestressed pipes, and connected by inserting a full-length prestressed bundle; the adoption of this scheme can make the prestressing arrangement on the pier wall flexible and easy to manufacture.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a prefabricated assembled hollow pier with a transverse diaphragm and a construction method. Background Art

[0002] At present, when bridge piers cross large rivers or oceans, the construction conditions are harsh, with strong winds and waves, short effective on-site working time, and difficult concrete pouring and maintenance. It is not suitable for cast-in-place construction. Factory-based and assembled construction has great advantages, greatly shortening the on-site working time and improving the quality of the project. It also has strong water transportation and hoisting capabilities, and can divide the piers into large sections, which can be assembled using large machinery and equipment. It is suitable for hollow piers with higher heights. It has been used in some water or sea bridge projects at home and abroad.

[0003] Hollow bridge piers are often taller and larger in cross-section, with ordinary steel bars arranged inside and outside the pier walls. When prefabrication and assembly are used, it is difficult to connect dense steel bars, so prestressing is often used for connection, that is, epoxy resin glue is applied between each segment, and then the segments are connected through prestressed beams. This connection method only connects the segments through prestressed beams, which has the disadvantages of insufficient energy dissipation capacity and low ductility, and is not suitable for high-seismic areas; there are many corrosive conditions at sea, and high durability requirements are required. There is a risk of corrosion in prestressed beams. If the corrosion is severe, it will cause the connection to fail, affecting the safety of the structure. In addition, the prestressed beams are located in the channel, which is often difficult to inspect, repair and replace; at the same time, when the hollow pier is high and the segment length is long, there are problems such as weak overall stability of the pier column and weak local stability of the pier wall.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a prefabricated assembled hollow pier with a diaphragm and a construction method, so as to alleviate the problems in the prior art of only connecting through prestressed tendons, such as insufficient energy dissipation capacity and low ductility.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The prefabricated assembled hollow pier with diaphragm provided by the present invention comprises a foundation, a general segment and a top cap segment in order from bottom to top, wherein the top of the foundation is provided with a foundation connecting steel bar and a foundation connecting column; the top and bottom of the general segment are provided with a general segment diaphragm, the general segment diaphragm at the bottom is provided with a general segment reserved groove, and the general segment connecting steel bar is provided on the general segment diaphragm at the top; the bottom of the top cap segment is provided with a top cap segment diaphragm, and the top cap segment reserved groove is provided on the top cap segment diaphragm at the bottom; during assembly, the connecting steel bar at the bottom is placed and connecting columns extend into the corresponding reserved grooves located above, and high-strength slurry is poured into each reserved groove; the foundation, general segments, and top cap segments are all pre-buried with prestressed pipes, which are connected by inserting the full-length prestressed bundle to ensure the connection performance between the segments; the anchoring end of the prestressed bundle is arranged in the foundation, connected by a self-locking anchor, and the full-length prestressed bundle is inserted from the top and then locked in the foundation, and tensioned from the tensioning end of the prestressed bundle at the top of the top cap segment to construct the prestressed bundle anchor; external protection is arranged around the junction of the foundation and the general segment to enhance the durability of the pier bottom joint.

[0008] In any of the above technical solutions, further, each cross diaphragm is located inside the hollow pier, and is arranged continuously or intermittently around the inner side of the pier wall. The outer side of each cross diaphragm is connected to the inner side of the pier wall, and a chamfered transition is provided at the connection to reduce stress concentration; it is prefabricated together with the corresponding segment to expand the force-bearing area below the segment, thereby enhancing stability during storage and assembly.

[0009] In any of the above technical solutions, the foundation connecting steel bars and general segment connecting steel bars are further embedded in the diaphragm and extend out of the surface of the corresponding segment. Foundation stirrups and general segment stirrups are respectively arranged at the extended parts to strengthen the integrity between the connecting steel bars and shorten the length of the connecting steel bars. A plurality of steel cages are formed between the foundation connecting steel bars and the foundation stirrups, and between the general segment connecting steel bars and the general segment stirrups, and are dispersedly arranged. The steel cages are circular or rectangular.

[0010] In any of the above technical solutions, further, a gap is left between each reserved groove and the outer contour of each corresponding connecting steel bar to facilitate insertion therein, and the four sides of each reserved groove are roughened or a corrugated pipe is embedded, and the cross-section of each reserved groove is circular or rectangular.

[0011] In any of the above technical solutions, further, the foundation connecting columns and the general segment connecting columns are both arranged on each transverse partition, prefabricated together with the corresponding segments and transverse partitions, and reinforced steel bars are arranged inside to enhance the shear resistance. The outer contour diameter of each connecting column is smaller than the size of one side of the corresponding reserved groove, and a gap is left between the two to facilitate insertion. The circumference of the foundation connecting columns and the general segment connecting columns is roughened, and the cross-sections of the foundation connecting columns and the general segment connecting columns are circular or rectangular; the connecting columns serve as shear-resistant structures between the segments and also play a positioning role when the segments are assembled; the connecting columns are dispersed above the transverse partitions and are staggered with the connecting steel bars.

[0012] In any of the above technical solutions, further, the high-strength slurry adopts ultra-high performance concrete or high-strength grouting material to form a whole between the reserved groove and the connecting steel bars and the connecting column. The high-strength slurry can adopt ultra-high performance concrete or high-strength grouting material to shorten the required length of the connecting steel bars and improve the safety of the connection.

[0013] In any of the above technical solutions, further, external protection is set around the junction of the foundation and the general segment, corrosion-resistant and wear-resistant UHPC is used, and reserved steel bar joints for the foundation and the general segment are set respectively. After the assembly is completed, the surface reinforcement is tied and the UHPC is poured to connect the external protection with the foundation and the general segment as a whole.

[0014] The construction method for prefabricated assembled hollow piers with diaphragms provided by the present invention comprises the following steps:

[0015] Step 1: foundation construction, foundation connection column construction, tying foundation stirrups of foundation connection steel bars, general segments and top cap segments prefabricated for assembly;

[0016] Step 2: Lay the bottom joint high-strength mortar on the top surface of the foundation, hoist the general segment to install it by the mortar-sitting method, insert the foundation connection steel bars and foundation connection columns on the foundation into the general segment reserved grooves on the general segment diaphragm, and pour the high-strength mortar;

[0017] Step 3: Lay the middle joint epoxy resin glue on the top surface of the lower general segment, hoist the upper general segment, insert the lower general segment connecting steel bars and general segment connecting columns into the top hat segment reserved groove on the top hat segment diaphragm, and pour high-strength slurry;

[0018] Step 4: lay the middle joint epoxy resin glue on the top surface of the general segment, hoist the top cap segment, insert the general segment connecting steel bars and the general segment connecting columns into the top cap segment reserved grooves on the top cap segment diaphragm, and pour high-strength slurry;

[0019] Step 5: From the top of the top hat segment, insert the full-length prestressed beam into the top hat segment, the general segment, and the prestressed pipe embedded in the foundation in turn, tension the prestressed beam from the tensioning end of the top hat segment, the anchoring end of the prestressed beam is located in the foundation, and the prestressed beam sealing anchor is constructed;

[0020] Step 6: grouting the pipes with full-length prestressed tendons;

[0021] Step 7. Tie up the facing reinforcement with the foundation reserved reinforcement joints and general segment reserved reinforcement joints, and pour external protection.

[0022] The beneficial effects of the present invention are:

[0023] The prefabricated assembled hollow bridge pier with a diaphragm and the construction method provided by the present invention have the following effects:

[0024] 1. By adding connecting steel bars, the shortcomings of insufficient energy consumption and low ductility of prestressed assembled piers can be solved, which is suitable for high-seismic areas; the connecting steel bars do not occupy the pier wall space, and the prestressing arrangement on the pier wall is flexible and easy to manufacture; the construction of connecting steel bars 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, have good durability, and are suitable for corrosive environments;

[0025] 2. The combination of prestressed steel strands and connecting steel bars significantly improves the connection performance at the joints, compensating for the risks of corrosion and failure of prestressed strands in pure prestressed connections, while reducing the number of prestresses required and simplifying the processes of prestressed strand threading and tensioning;

[0026] 3. The stability of the segment is improved by setting up the diaphragm, the segment length of the pier segment is increased, the number of joints is reduced, and the overall stability of the pier and the local stability of the pier wall are improved. It is particularly suitable for high piers in water areas or sea areas. When the pier is cast in place, the setting of the diaphragm greatly increases the difficulty of construction due to the influence of the inner formwork creeping formwork, etc. The segment of this scheme adopts prefabrication construction, which is simple to make and effectively solves the problem of construction inconvenience.

[0027] 4. The connecting columns between segments also serve as structural shear keys, and no shear keys are set on the pier wall, which simplifies the setting of special templates during segment manufacturing, saves costs and speeds up segment manufacturing progress; during assembly, there is no need for precise alignment of the pier wall shear keys, which speeds up the assembly speed.

[0028] 5. The connecting steel bars are inserted into the reserved grooves, which have a large construction tolerance. The reserved grooves are used as templates for pouring high-strength slurry, which makes construction convenient.

[0029] 6. Use the connecting column as the positioning key for pier column assembly to facilitate the positioning of the segments during assembly; the connecting column has large size, high construction quality and strong shear resistance.

[0030] 7. The pier wall diaphragm increases the bottom area of ​​the segment, improves the stability of the segment storage and assembly process, and facilitates temporary locking.

[0031] 8. The pier bottom joints are often located underwater and are easily affected by water level changes and scouring, which affects the durability of the joints. By setting up external protection around the pier bottom joints and using corrosion-resistant and wear-resistant UHPC, the durability of the pier bottom joints is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of a facade structure of a prefabricated assembled hollow pier with a diaphragm provided in an embodiment of the present invention (I);

[0034] Figure 2 This is a schematic diagram of the facade structure of a prefabricated assembled hollow pier with a diaphragm provided in an embodiment of the present invention (II);

[0035] Figure 3 It is a schematic diagram of a prefabricated assembled hollow pier foundation structure with a diaphragm provided in an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of a general segment structure of a prefabricated assembled hollow bridge pier with a diaphragm provided in an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of a structure of a prefabricated assembled hollow pier top cap segment with a diaphragm provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of joint assembly of prefabricated hollow piers with diaphragms provided by an embodiment of the present invention (I);

[0039] Figure 7 This is a schematic diagram of joint assembly of prefabricated hollow piers with diaphragms provided by an embodiment of the present invention (II);

[0040] Figure 8 This is a schematic diagram of joint assembly of prefabricated hollow piers with diaphragms provided by an embodiment of the present invention (III);

[0041] Fig. 9 It is a schematic diagram of an external protective structure suitable for a prefabricated assembled hollow pier with a transverse diaphragm provided in an embodiment of the present invention.

[0042] icon:

[0043] 1- Foundation;

[0044] 101- Foundation connection steel bars;

[0045] 102- foundation stirrups;

[0046] 103- foundation connection column;

[0047] 2-General segment;

[0048] 201-General segment connection reinforcement;

[0049] 202-General segmental stirrups;

[0050] 203-General segment connection column;

[0051] 204-general segmental diaphragm;

[0052] 205-General segment reserved slot;

[0053] 3-top hat segment;

[0054] 301-top hat segment diaphragm;

[0055] 302-top hat segment reserved slot;

[0056] 4-External protection;

[0057] 401-Reserved steel bar joints in foundation;

[0058] 402-General segment reserved steel bar joints;

[0059] 403-face reinforcement;

[0060] 5- bottom seam;

[0061] 6- Middle seam;

[0062] 7- Prestressed pipes;

[0063] 8-Full-length prestressed tendon;

[0064] 801- prestressed tendon anchorage end;

[0065] 802- prestressed tendon tensioning end;

[0066] 803-Prestressed anchor;

[0067] 9-Pipeline grouting;

[0068] 10-High strength slurry. DETAILED DESCRIPTION

[0069] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0070] In the description of the present invention, it should be noted that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] Example

[0073] like Figure 1 — Fig. 9 As shown in the figure, it is a schematic diagram of the corresponding structure of the prefabricated assembled hollow pier with a diaphragm provided in this embodiment. Figure 1-Figure 9 This plan is explained as follows:

[0074] The prefabricated assembled hollow pier with diaphragm provided in this embodiment includes, from bottom to top, a foundation 1, a general segment 2 and a top cap segment 3. A connecting steel bar 101 and a connecting column 103 are arranged on the top of the foundation 1; a general segment diaphragm 204 is arranged on the top and bottom of the general segment 2, a general segment reserved groove 205 is arranged on the general segment diaphragm 204 at the bottom, and a connecting steel bar 201 is arranged on the general segment diaphragm 204 at the top; a top cap segment diaphragm 301 is arranged on the bottom of the top cap segment 3, and a top cap segment reserved groove 302 is arranged on the top cap segment diaphragm 301 at the bottom; during assembly, the connecting steel bars and The connecting column extends into the corresponding reserved groove located above, and high-strength slurry 10 is poured into the reserved groove; the foundation 1, the general segment 2, and the top cap segment 3 are all pre-buried with prestressed pipes 7, which are connected by inserting the full-length prestressed bundle 8 to ensure the connection performance between the segments; the prestressed bundle anchoring end 801 is arranged in the foundation 1, and is connected by a self-locking anchor. After the full-length prestressed bundle 8 is inserted from the top, it is locked in the foundation 1, and the prestressed bundle tensioning end 802 at the top of the top cap segment 3 is tensioned to perform the prestressed bundle sealing anchor 803; the junction between the foundation 1 and the general segment 2 is the bottom joint, and an external protection 4 is arranged around the bottom joint to enhance the durability of the pier bottom joint.

[0075] Furthermore, each diaphragm is located inside the hollow pier, and is arranged continuously or intermittently around the inner side of the pier wall. The outer side of each diaphragm is connected to the inner side of the pier wall, and a chamfered transition is provided at the joint to reduce stress concentration. It is prefabricated together with the corresponding segment to expand the stress-bearing area under the segment and enhance stability during storage and assembly.

[0076] Specifically, the general segment diaphragm 204 and the top cap segment diaphragm 301 are located inside the hollow pier, and are arranged continuously or intermittently around the inner side of the pier wall. The outer side of each diaphragm is connected to the inner side of the pier wall, and a chamfered transition is provided at the connection; they are prefabricated together with the corresponding segments.

[0077] Furthermore, the foundation connecting steel bars 101 and the general segment connecting steel bars 201 are pre-buried in each transverse partition and extended to a certain length. Foundation stirrups 102 are arranged on the foundation connecting steel bars 101, and general segment stirrups 202 are arranged on the general segment connecting steel bars 201 to strengthen the integrity of the connecting steel bars and shorten the length of the connecting steel bars. The foundation connecting steel bars 101 and the foundation stirrups 102, and the general segment connecting steel bars 201 and the general segment stirrups 202 each form a plurality of steel cages which are dispersedly arranged, and the steel cages are circular or rectangular.

[0078] Furthermore, the general segment reserved groove 205 and the top cap segment reserved groove 302 are respectively arranged on each cross partition, and the diameter of each reserved groove is 5 cm larger than the outer contour of the corresponding connecting steel bar on one side, forming a gap for easy insertion. The four sides of each reserved groove are roughened or corrugated pipes are embedded, and the cross-section of each reserved groove is circular or rectangular.

[0079] Furthermore, the foundation connecting columns 103 and the general segment connecting columns 203 are arranged on each diaphragm and prefabricated together with the corresponding segments and diaphragms. Reinforced steel bars are arranged inside to enhance the shear resistance. The outer contour diameter of each connecting column is 5 cm smaller than the corresponding reserved groove on one side to form a gap for easy insertion. The circumference of each connecting column is roughened and the cross-section of each connecting column is circular or rectangular. Each connecting column serves as a shear-resistant structure between segments and also plays a positioning role when the segments are assembled. Each connecting column is dispersed above each diaphragm and is staggered with the connecting steel bars.

[0080] Furthermore, the high-strength grout 10 uses ultra-high performance concrete or high-strength grouting material to form a whole between each reserved groove and each connecting steel bar and each connecting column. The high-strength grout 10 can use ultra-high performance concrete or high-strength grouting material to shorten the required length of the connecting steel bar and improve the connection safety.

[0081] Furthermore, the outer protection 4 is located around the bottom joint 5 and adopts corrosion-resistant and wear-resistant UHPC. A foundation reserved steel bar joint 401 and a general segment reserved steel bar joint 402 are respectively provided. After the assembly is completed, the surface reinforcement 403 is tied and the UHPC is poured to connect the outer protection 4 with the foundation 1 and the general segment 2 as a whole.

[0082] The construction method for prefabricated assembled hollow piers with diaphragms provided by the present invention comprises the following steps:

[0083] Step 1: Construction of foundation 1, construction of foundation connecting column 103, tying of foundation stirrups 102 of foundation connecting steel bar 101, prefabrication of general segment 2 and top cap segment 3 to be assembled;

[0084] Step 2: Figure 6-8 As shown, a bottom joint 5 high-strength slurry 10 is laid on the top surface of the foundation 1, and the general segment 2 is hoisted for installation by the slurry sitting method. The foundation connecting steel bars 101 and the foundation connecting columns 103 on the foundation 1 are inserted into the general segment reserved grooves 205 on the general segment diaphragm 204, and the high-strength slurry 10 is poured;

[0085] Step 3: lay epoxy resin glue on the middle joint 6 on the top surface of the lower general segment 2, hoist the upper general segment 2, insert the lower general segment connecting steel bars 201 and the general segment connecting columns 203 into the top hat segment reserved grooves 302 on the top hat segment diaphragm 301, and pour high-strength slurry 10;

[0086] Step 4: lay epoxy resin glue on the middle joint 6 on the top surface of the general segment 2, hoist the top cap segment 3, insert the general segment connecting steel bars 201 and the general segment connecting columns 203 into the top cap segment reserved grooves 302 on the top cap segment diaphragm 301, and pour high-strength slurry 10;

[0087] Step 5: From the top of the top hat segment 3, insert the full-length prestressed bundle 8 into the top hat segment 3, the general segment 2, and the prestressed pipe 7 embedded in the foundation 1 in turn, tension the prestressed bundle from the tensioning end 802 of the top of the top hat segment 3, the anchoring end 801 of the prestressed bundle is located in the foundation 1, and the prestressed bundle sealing anchor 803 is constructed;

[0088] Step 6: Perform pipeline grouting 9 on the pipeline of the full-length prestressed bundle 8;

[0089] Step 7: Fig. 9 As shown, the face reinforcement 403 is tied to the foundation reserved reinforcement joint 401 and the general segment reserved reinforcement joint 402, and the outer protection 4 is poured.

[0090] The prefabricated assembled hollow bridge pier with a diaphragm and the construction method provided in the embodiment of the present invention have the following effects:

[0091] 1. By adding connecting steel bars, the shortcomings of insufficient energy consumption and low ductility of prestressed assembled piers can be solved, which is suitable for high-seismic areas; the connecting steel bars do not occupy the pier wall space, and the prestressing arrangement on the pier wall is flexible and easy to manufacture; the construction of connecting steel bars 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, have good durability, and are suitable for corrosive environments;

[0092] 2. The combination of prestressed steel strands and connecting steel bars significantly improves the connection performance at the joints, compensating for the risks of corrosion and failure of prestressed strands in pure prestressed connections, while reducing the number of prestresses required and simplifying the processes of prestressed strand threading and tensioning;

[0093] 3. The stability of the segment is improved by setting up the diaphragm, the segment length of the pier segment is increased, the number of joints is reduced, and the overall stability of the pier and the local stability of the pier wall are improved. It is particularly suitable for high piers in water areas or sea areas. When the pier is cast in place, the setting of the diaphragm greatly increases the difficulty of construction due to the influence of the inner formwork creeping formwork, etc. The segment of this scheme adopts prefabrication construction, which is simple to make and effectively solves the problem of construction inconvenience.

[0094] 4. The connecting columns between segments also serve as structural shear keys, and no shear keys are set on the pier wall, which simplifies the setting of special templates during segment manufacturing, saves costs and speeds up segment manufacturing progress; during assembly, there is no need for precise alignment of the pier wall shear keys, which speeds up the assembly speed.

[0095] 5. The connecting steel bars are inserted into the reserved grooves, which have a large construction tolerance. The reserved grooves are used as templates for pouring high-strength slurry, which makes construction convenient.

[0096] 6. Use the connecting column as the positioning key for pier column assembly to facilitate the positioning of the segments during assembly; the connecting column has large size, high construction quality and strong shear resistance.

[0097] 7. The pier wall diaphragm increases the bottom area of ​​the segment, improves the stability of the segment storage and assembly process, and facilitates temporary locking.

[0098] 8. The pier bottom joints are often located underwater and are easily affected by water level changes and scouring, which affects the durability of the joints. By setting up external protection around the pier bottom joints and using corrosion-resistant and wear-resistant UHPC, the durability of the pier bottom joints is enhanced.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated assembled hollow pier with a diaphragm, comprising, from bottom to top, a foundation (1), a general segment (2) and a top cap segment (3), Features: A foundation connecting steel bar (101) and a foundation connecting column (103) are arranged on the top of the foundation (1); General segment transverse diaphragms (204) are arranged at the top and bottom of the general segment (2), a general segment reserved groove (205) is arranged on the general segment transverse diaphragm (204) at the bottom, and a general segment connecting steel bar (201) is arranged on the general segment transverse diaphragm (204) at the top; A top hat segment transverse partition (301) is arranged at the bottom of the top hat segment (3), and a top hat segment reserved groove (302) is arranged on the top hat segment transverse partition (301) located at the bottom; During assembly, the connecting steel bars and connecting columns at the bottom are inserted into the corresponding reserved grooves at the top, and high-strength slurry (10) is poured into each reserved groove; The foundation (1), the general segment (2), and the top cap segment (3) are all pre-buried with prestressed pipes (7), which are connected by inserting a full-length prestressed bundle (8); An external protection (4) is arranged around the junction between the foundation (1) and the general segment (2); Each diaphragm is located inside the hollow pier and is arranged continuously or discontinuously around the inner side of the pier wall. The outer side of each diaphragm is connected to the inner side of the pier wall, and a chamfer transition is set at the joint, which is prefabricated together with the corresponding segment; The foundation connection column (103) and the general segment connection column (203) are both arranged on each transverse partition, prefabricated together with the corresponding segment and transverse partition, and reinforced steel bars are arranged inside. The outer contour diameter of each connection column is smaller than the size of one side of the corresponding reserved groove, and a gap is left between the two. The circumference of the foundation connection column (103) and the general segment connection column (203) is roughened, and the cross-sections of the foundation connection column (103) and the general segment connection column (203) are circular or rectangular; the connection columns are dispersedly arranged above each transverse partition, and are staggered with the connection steel bars.

2. The prefabricated assembled hollow pier with diaphragm according to claim 1, It is characterized in that The foundation connecting steel bars (101) and the general segment connecting steel bars (201) are pre-buried in the transverse diaphragm and extend out of the surface of the corresponding segment. The foundation stirrups (102) and the general segment stirrups (202) are respectively arranged at the extended parts. A plurality of steel cages are formed between the foundation connecting steel bars (101) and the foundation stirrups (102), and between the general segment connecting steel bars (201) and the general segment stirrups (202). The steel cages are dispersedly arranged, and the steel cages are circular or rectangular.

3. The prefabricated assembled hollow pier with diaphragm according to claim 1, It is characterized in that A gap is left between each reserved groove and the outer contour of the corresponding connecting steel bar. The four sides of each reserved groove are roughened or a corrugated pipe is embedded. The cross-section of each reserved groove is circular or rectangular.

4. The prefabricated assembled hollow pier with diaphragm according to claim 1, It is characterized in that The high-strength slurry (10) is made of ultra-high performance concrete or high-strength grouting material.

5. The prefabricated assembled hollow pier with diaphragm according to claim 1, It is characterized in that An external protection (4) is provided around the joint between the foundation (1) and the general segment (2), using corrosion-resistant and wear-resistant UHPC, and a foundation reserved steel bar joint (401) and a general segment reserved steel bar joint (402) are provided respectively. After the assembly is completed, the surface steel bars are tied.

6. A construction method suitable for prefabricated assembled hollow piers with diaphragms, It is characterized in that The steps include: Step 1: constructing the foundation (1), constructing the foundation connecting column (103), tying the foundation stirrups (102) of the foundation connecting steel bars (101), and prefabricating the general segments (2) and the top cap segments (3) to be assembled; Step 2: Lay the bottom joint (5) high-strength mortar on the top surface of the foundation (1), hoist the general segment (2) for installation by the mortar-sit method, insert the foundation connecting steel bars (101) and the foundation connecting columns (103) on the foundation (1) into the general segment reserved grooves (205) on the general segment transverse diaphragms (204), and pour the high-strength mortar (10); Step 3: lay epoxy resin glue on the middle joint (6) on the top surface of the lower general segment, hoist the upper general segment, insert the lower general segment connecting steel bars and the general segment connecting column (203) into the top hat segment reserved groove (302) on the top hat segment diaphragm (301), and pour high-strength slurry (10); Step 4: lay epoxy resin glue on the middle joint (6) on the top surface of the general segment (2), hoist the top cap segment (3), insert the general segment connecting steel bars (201) and the general segment connecting columns (203) into the top cap segment reserved grooves (302) on the top cap segment diaphragms (301), and pour high-strength slurry (10); Step 5: From the top of the top cap segment (3), insert the full-length prestressed bundle (8) into the top cap segment (3), the general segment (2), and the prestressed pipe (7) embedded in the foundation (1) in sequence, tension the prestressed bundle tensioning end (802) at the top of the top cap segment (3), the prestressed bundle anchoring end (801) is located in the foundation (1), and the prestressed bundle sealing anchor (803) is constructed; Step 6: grouting (9) the pipeline of the full-length prestressed bundle (8); Step 7: Tie the face reinforcement (403) to the foundation reserved reinforcement joint (401) and the general segment reserved reinforcement joint (402), and cast the outer protection (4).

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